Mathlib triage dashboard

Welcome to the PR triage page! This page is perfect if you intend to look for pull request which seem to have stalled.
Feedback on designing this page or further information to include is very welcome.

This dashboard was last updated on: May 19, 2026 at 04:47 UTC

Overall statistics

Found 2550 open PRs overall. Among these PRs

469 (18.4%) are awaiting review (these ones), among these 96 (19.8%) by new contributors (these ones)
355 (13.9%) are blocked on another PR
212 (8.3%) are awaiting the PR author's action
175 (6.9%) have a merge conflict: among these, 130 (74.3%) would be ready for review otherwise: these
26 (1.0%) are labelled help-wanted or please-adopt (roughly these)
766 (30.0%) are marked as draft or work in progress
14 (0.5%) are awaiting the outcome of a zulip discussion (these ones)
515 (20.2%) are opened from mathlib's main repo and need migration to a fork (these ones)
1 (0.0%) have contradictory labels (these ones)
16 (0.6%) are delegated (stale ones are here)
1 (0.0%) have been sent to bors (stale ones are here)

Approved, not yet landed PRs

At the moment,

2 PRs are ready to merge: 2 of them are stale, and merit another look

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
37625	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Charpoly): general coefficient formula as sum of principal minors	This PR adds a general formula for the coefficients of `det(1 + X • M)` as sums of principal minors, generalizing the existing `coeff_det_one_add_X_smul_one` (k=1, trace) and `det_eq_sign_charpoly_coeff` (k=n, determinant). It also derives the corresponding formula for the coefficients of the characteristic polynomial via `charpolyRev`. New results: - `det_piecewise_one_eq_submatrix_det`: relates piecewise-with-identity to principal submatrix determinants - `coeff_det_one_add_X_smul_eq_sum_minors`: the k-th coefficient of `det(1 + X • M)` equals the sum of k×k principal minors - `charpoly_coeff_eq_sum_minors`: coefficients of the characteristic polynomial as signed sums of principal minors ---	t-algebra new-contributor ready-to-merge label:t-algebra$	105/1	Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean	1	28	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-bors', 'slavanaprienko', 'wwylele']	nobody	7-28909 7 days ago	7-85484 7 days ago	37-17965 37 days
39259	jcommelin author:jcommelin	chore(Tactic/StacksAttribute): add deprecated module	This PR adds `Tactic/StacksAttribute.lean` back as deprecated_module. --- - [x] depends on: #39257, where the file is removed [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated auto-merge-after-CI	7/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/StacksAttribute.lean	3	5	['adomani', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	adomani assignee:adomani	4-55347 4 days ago	6-45947 6 days ago	0-3182 53 minutes

49 PRs are waiting on maintainer approval (these), of which 34 have not been updated in a day (these)

31 PRs have been delegated and not updated in a day

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	347-57217 11 months ago	347-58108 347 days ago	0-10326 2 hours
26911	JovanGerb author:JovanGerb	chore: fix naming of `mono` and `monotone`	The naming convention says: "We use `_mono` for `a ≤ b → f a ≤ f b` and `_anti` for `a ≤ b → f b ≤ f a`, so we also use `_monotone` for `Monotone f`, `_antitone` for `Antitone f`, `_strictMono` for `StrictMono f`, `_strictAnti` for `StrictAnti f`, etc..." This PR swaps `mono`/`anti` and `monotone`/`antitone` where required so that `monotone` refers to `Monotone`, while `mono` refers to a lemma that might be tagged with `@[gcongr]` This PR does not address - `monotone_right`/`mono_right` vs `right_monotone`/`right_mono` - `monotone_arcsin` vs `arcsin_monotone` edit: TODO: `ideal_mono` and friends --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated merge-conflict	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Normed/Order/UpperLower.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Filter/AtTopBot/Defs.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Fin.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/UpperLower/Closure.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean	59	11	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	311-10793 10 months ago	311-51792 311 days ago	2-55296 2 days
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order delegated easy	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	214-33321 7 months ago	235-65411 235 days ago	3-79002 3 days
25737	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_δ`s	We prove that admissible lists indeed provide a normal form for morphisms of satisfying `P_δ`. To this end, we introduce `standardδ`, a construction that takes a list and turn it into a composition of `δ i`s in `SimplexCategoryGenRel`. We then prove that, thanks to the first simplicial identity, composition on the left corresponds to simplicial insertion in the list. This gives existence of a normal form for every morphism satisfying `P_δ`. For unicity, we introduce an auxiliary function `simplicialEvalδ : (List ℕ) → ℕ → ℕ` and show that for admissible lists, it lifts to `ℕ` the `orderHom` attached to `toSimplexCategory.map standardδ`, and that we can recover elements of the list only by looking at values of this function. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [x] depends on: #25736 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21746. Original PR: https://github.com/leanprover-community/mathlib4/pull/21746	t-algebraic-topology delegated t-category-theory	182/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	209-52991 6 months ago	210-44707 210 days ago	0-22513 6 hours
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	32	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	199-54910 6 months ago	278-70445 278 days ago	28-12053 28 days
25765	JovanGerb author:JovanGerb	feat(gcongr): lemma for rewriting inside divisibility	TODO: add test to show that we can rewrite using `a ≡ b [ZMOD n]` inside `n ∣ 2 * a + 1`. edit: it's not yet entirely clear if this is the right thing to do. edit: This lemma should be written using iff (or =), so that we can use it specifically when rewriting with a symmetric relation. Supporting equality in `gcongr` is still work in progress. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated t-data	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	185-64912 6 months ago	339-51192 339 days ago	1-19951 1 day
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict awaiting-author delegated t-meta	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	19	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	136-12226 4 months ago	263-42739 263 days ago	83-68773 83 days
31092	FlAmmmmING author:FlAmmmmING	feat(Algebra/Group/ForwardDiff.lean): Add theorem `sum_shift_eq_fwdDiff_iter`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	17/1	Mathlib/Algebra/Group/ForwardDiff.lean	1	20	['BeibeiX0', 'FlAmmmmING', 'Ruben-VandeVelde', 'dagurtomas', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	116-49988 3 months ago	116-49988 116 days ago	54-22055 54 days
27702	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Lambda-squared sieves and prove important properties	This PR continues the work from #22052. Original PR: https://github.com/leanprover-community/mathlib4/pull/22052 - [x] depends on: #27820	t-number-theory delegated merge-conflict	186/7	Mathlib/NumberTheory/SelbergSieve.lean	1	44	['FLDutchmann', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	96-80019 3 months ago	158-76064 158 days ago	15-82750 15 days
34909	SnirBroshi author:SnirBroshi	feat(Data/Sym/Sym2): `fromRel` equivalence with `Sigma` over a `Quotient`	Add a non-dependent recursor on members of a `fromRel` set, and the following `Equiv`s: - The `fromRel` set of a symmetric relation `r` is equivalent to summing that set restricted to fibers of `f`. - For a relation homomorphism `r →r r'` where `r` is symmetric, the `fromRel` set of `r` is equivalent to summing that set restricted to equivalence classes of `r'` using a `Subtype`. --- I find this recursor pretty useful when dealing with `fromRel`, the idea came from a suggestion by @kmill [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Eq.2Erec.20with.20a.20constant.20does.20nothing.3A.20h.20.E2.96.B8.20c.20.3D.20c/near/565176948) for another `Sym2` conundrum. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	43/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Data/Sym/Sym2.lean	1	15	['SnirBroshi', 'chrisflav', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	eric-wieser assignee:eric-wieser	91-33452 3 months ago	18-80775 18 days ago	82-35003 82 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	Under the current definition, `IsLocalHom f` and `IsLocalHom f.toMonoidHom` are not defeq, which causes quite some annoyances. We also have a consensus to not use `*HomClass` in definitions. As a result, we change `IsLocalHom` to take an unbundled function instead of a funlike. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated merge-conflict label:t-algebra$	18/9	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean	5	15	['adomani', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp']	mattrobball assignee:mattrobball	90-18710 3 months ago	181-70879 181 days ago	24-84527 24 days
33691	kim-em author:kim-em	feat(scripts): add find-ci-errors.sh to diagnose widespread CI failures	This PR adds a script that searches through recent failed CI workflow runs to find open PRs whose current CI contains a specific error string. Useful for diagnosing widespread CI issues affecting multiple PRs (e.g., infrastructure problems, toolchain bugs). Usage: ```bash # Find all PRs currently failing with a specific error ./scripts/find-ci-errors.sh "Error parsing args: cannot parse arguments" # Find PRs and automatically add please-merge-master label to trigger rebuilds ./scripts/find-ci-errors.sh --please-merge-master "cannot parse arguments" ``` The `--please-merge-master` flag skips PRs with merge conflicts, and the label is automatically removed by CI once the build completes. 🤖 Prepared with Claude Code	CI delegated merge-conflict LLM-generated	196/0	scripts/README.md,scripts/find-ci-errors.sh	2	6	['bryangingechen', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	83-81448 2 months ago	132-13943 132 days ago	0-7055 1 hour
34932	erdOne author:erdOne	feat(AlgebraicGeometry): formally etale morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict delegated	163/12	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyEtale.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/RingHom/Etale.lean	5	17	['chrisflav', 'erdOne', 'github-actions', 'joneugster', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash']	nobody	81-12146 2 months ago	83-20635 83 days ago	11-40391 11 days
34015	erdOne author:erdOne	feat(AlgebraicGeometry): category of schemes affine over a base	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry delegated awaiting-author	466/11	Mathlib.lean,Mathlib/AlgebraicGeometry/AffineOver.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/SmallAffineZariski.lean,Mathlib/CategoryTheory/Sites/Hypercover/Subcanonical.lean	7	52	['chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	76-46620 2 months ago	8-72163 8 days ago	40-35668 40 days
31135	kckennylau author:kckennylau	feat(RingTheory): is localization iff is localization on saturation	In this PR we show that `A` is a localization of `R` on the submonoid `S` iff it is so on the saturation of `S`. Crucially, the saturation of `S` is precisely the elements that become a unit in `A`. --- - [x] depends on: #31132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory delegated	53/0	Mathlib.lean,Mathlib/RingTheory/Localization/Saturation.lean	2	15	['alreadydone', 'chrisflav', 'github-actions', 'kckennylau', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	69-13671 2 months ago	41-67206 41 days ago	32-67213 32 days
35588	eric-wieser author:eric-wieser	chore(Util/Qq): remove `meta`	These are wrappers of existing functions on `Expr`s which are also not marked `meta`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-CI delegated	7/7	Mathlib/Data/Multiset/Sort.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Order/ToInt.lean,Mathlib/Tactic/Simproc/Divisors.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Util/Qq.lean	7	3	['Vierkantor', 'github-actions', 'mathlib-bors']	nobody	68-77765 2 months ago	86-75701 86 days ago	0-35325 9 hours
31607	grunweg author:grunweg	chore: rename `continuous{,On,At,Within}_const` to `ContinuousFoo.const`	Zulip discussion: [#mathlib4 > Naming convention @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/447491526) --- - [x] depends on: #34441 - [x] depends on: #34688 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated merge-conflict awaiting-CI	352/364	Archive/Hairer.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Continuity.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/HalfPlane.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Measure.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/PartitionOfUnity.lean,Mathlib/Analysis/Convex/Side.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Continuous.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/HarmonicContOnCl.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Lemmas.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/Normed/Module/Connected.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Isometric.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/PoissonSummation.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSq.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Manifold/Bordism.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/SmoothApprox.lean,Mathlib/MeasureTheory/Function/SpecialFunctions/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/Deriv.lean,Mathlib/NumberTheory/LSeries/Dirichlet.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean	180	15	['github-actions', 'j-loreaux', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-29422 2 months ago	186-22277 186 days ago	0-1 1 second
37232	mathlib-splicebot author:mathlib-splicebot	chore(Algebra/Order): bound on `\|n / m\|ₘ` and `\|n - m\|`	This PR was automatically created from PR #34722 by @GrigorenkoPV via a [review comment](https://github.com/leanprover-community/mathlib4/pull/34722#discussion_r2996870566) by @Vierkantor.	t-algebra delegated label:t-algebra$	5/0	Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	1	6	['Vierkantor', 'bryangingechen', 'github-actions', 'mathlib-bors']	nobody	53-24351 1 month ago	53-36784 53 days ago	0-588 9 minutes
37507	gasparattila author:gasparattila	chore(Topology/Algebra/Module/Star): tag continuity lemmas with `fun_prop`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy delegated	4/4	Mathlib/Topology/Algebra/Module/Star.lean	1	3	['gasparattila', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	47-42171 1 month ago	47-42171 47 days ago	0-2151 35 minutes
37889	LLaurance author:LLaurance	chore(Algebra): shorten proof by using tactic mode instead of calc mode	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	4/13	Mathlib/Algebra/Star/Center.lean	1	16	['JovanGerb', 'LLaurance', 'faenuccio', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors', 'themathqueen']	nobody	29-40854 29 days ago	37-45436 37 days ago	1-5229 1 day
38732	eric-wieser author:eric-wieser	fix: revert and fix #38703	#38703 removed the canary intended to detect a broken lemma, without fixing the lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	4/11	Mathlib/Algebra/Group/Action/Units.lean	1	5	['github-actions', 'kbuzzard', 'mathlib-bors']	nobody	18-65104 18 days ago	18-65104 18 days ago	0-57214 15 hours
37955	artie2000 author:artie2000	feat(Algebra/Polynomial): lemmas about `modByMonic`	* Add various small lemmas about `Polynomial.modByMonic` * Remove unneccesary commutativity assumption on `Polynomial.aeval_eq_zero_of_dvd_aeval_eq_zero` by proving `Polynomial.aeval_dvd` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	20/6	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean	5	4	['github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	12-29937 12 days ago	12-29937 12 days ago	24-18920 24 days
38702	jcommelin author:jcommelin	chore(Data/Real): encapsulate real numbers	This PR: * hides the definition of the real numbers * preserves defeqs when casting `Nat`, `Int`, `Rat`, into the reals * preserves the defeq `x - y = x + (-y)` for `x y : Real` * removes a bunch of technical debt * adjusts imports in the library, where files relied on getting access to Cauchy sequences transitively via importing the reals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	235/256	Archive/Imo/Imo2013Q5.lean,Counterexamples/SeminormLatticeNotDistrib.lean,Mathlib.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Real/Cauchy.lean,Mathlib/Data/Real/Sign.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Instances/Real/Lemmas.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/UniformSpace/CompareReals.lean,Mathlib/Topology/UniformSpace/Real.lean,MathlibTest/Complex.lean,MathlibTest/Quaternion.lean,MathlibTest/Real.lean,MathlibTest/peel.lean	26	31	['JovanGerb', 'Kha', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'jcommelin', 'leanprover-radar', 'mathlib-bors', 'riccardobrasca', 'sgouezel', 'wkrozowski']	nobody	11-57554 11 days ago	19-59904 19 days ago	0-2637 43 minutes
38597	kim-em author:kim-em	chore: backport robustness changes from bump/nightly-2026-04-27	See [#nightly-testing > nightly#213 adaptations for nightly-2026-04-27 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/428973-nightly-testing/topic/nightly.23213.20adaptations.20for.20nightly-2026-04-27/near/591262169).	t-category-theory delegated	91/26	Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Hypercover/One.lean	7	10	['github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	joelriou assignee:joelriou	8-69401 8 days ago	8-69402 8 days ago	11-49769 11 days
38189	artie2000 author:artie2000	feat: simplify proof of `IsAdjoinRootMonic.mkOfAdjoinEqTop'`	* Simplify the proof of `IsAdjoinRootMonic.mkOfAdjoinEqTop'` by factoring out a lemma `OrzechProperty.bijective_of_surjective_of_finrank_le` and making use of the existing lemma `finrank_le_iff_exists_linearMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory delegated	22/21	Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/RingTheory/IsAdjoinRoot.lean	2	8	['Vierkantor', 'artie2000', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-66114 6 days ago	6-66114 6 days ago	24-41408 24 days
39064	kim-em author:kim-em	feat: make showLinter detect tactics that assign metavariables	This PR removes a short-circuit in `showLinter` that suppressed the linter whenever the syntactic goal was unchanged by a `show` tactic. A `show` invocation can still have side-effects on the metavariable context — tactic elaboration may assign metavariables while leaving the goal type unchanged — so the existing `instantiateMVars`-based diff check should run unconditionally. The fast path for the genuine no-op case is preserved: if `before` and `after` types still match after `instantiateMVars`, the linter doesn't fire. This was discovered while adapting Mathlib to nightly-2026-05-03 in https://github.com/leanprover-community/mathlib4-nightly-testing/pull/215 and is being extracted here so it can land independently of that bump. 🤖 Prepared with Claude Code	t-linter delegated	1/1	Mathlib/Tactic/Linter/Style.lean	1	3	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	thorimur assignee:thorimur	4-55724 4 days ago	4-55725 4 days ago	6-25575 6 days
39259	jcommelin author:jcommelin	chore(Tactic/StacksAttribute): add deprecated module	This PR adds `Tactic/StacksAttribute.lean` back as deprecated_module. --- - [x] depends on: #39257, where the file is removed [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated auto-merge-after-CI	7/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/StacksAttribute.lean	3	5	['adomani', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	adomani assignee:adomani	4-55347 4 days ago	6-45947 6 days ago	0-3182 53 minutes
38968	eric-wieser author:eric-wieser	fix: improve defeqs of comp actions	The (deliberately) non-reducible `SMul.comp.smul` definition caused us to end with these failing unification examples at instance reducibility: ```lean example : (Module.compHom ℕ (RingHom.id ℕ)).toSMul = SMul.comp ℕ (RingHom.id ℕ) := by with_reducible_and_instances rfl example : (Module.compHom ℕ (RingHom.id ℕ)).toMulAction = MulAction.compHom ℕ (MonoidHom.id ℕ) := by with_reducible_and_instances rfl ``` There are two issues this fixes: * the `compHom` constructors are inconsistent on whether they use `SMul.comp.smul` or reimplement its contents * we need `SMul.comp.smul` to be instance-reducible, so that when invoked with the identity function it is instance-defeq to the original action. As a bonus, allowing these to unify means we can have a single `SMul.comp_smul_def` lemma that works for all of the `compHom` definitions. We could also consider changing `compHom` to take a `HomClass` in order to remove the casts entirely, which would remove the need to add these `SMul.comp` terms. This PR leaves that for possible future work, noting that in the past we have moved away from writing `def`s taking `HomClass`es. Co-authored-by: Junye Ji --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Refined from #38777	t-algebra delegated label:t-algebra$	35/19	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/Module/RingHom.lean	5	5	['JJYYY-JJY', 'Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	3-60038 3 days ago	3-60038 3 days ago	8-53809 8 days
38911	Vierkantor author:Vierkantor	chore(Tactic): deprecate `substs` and replace it with `subst`	The `substs` tactic was a wrapper around `subst` to call it multiple times for different hypotheses. But `subst` now supports multiple hypotheses, so we can deprecate `substs` and replace it with `subst`. I added a deprecation warning using a `Try this:` message. Spotted while checking tactic docstrings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated	46/42	Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/CategoryTheory/Preadditive/Mat.lean,Mathlib/Computability/DFA.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/RingedSpace/Stalks.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Order/Concept.lean,Mathlib/Order/JordanHolder.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic/Substs.lean,Mathlib/Topology/Gluing.lean	22	17	['JovanGerb', 'Vierkantor', 'bryangingechen', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors', 'plp127']	thorimur assignee:thorimur	2-17519 2 days ago	9-17872 9 days ago	5-44109 5 days
38536	CoolRmal author:CoolRmal	feat: a lemma about the symmetric difference of unions	Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy delegated	58/2	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/CompleteBooleanAlgebra.lean	2	17	['CoolRmal', 'SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	2-3414 2 days ago	4-37203 4 days ago	7-75625 7 days
38739	CoolRmal author:CoolRmal	feat: Analytic Hahn Banach theorem for locally convex spaces	Closes #38419 This PR proves Hahn-Banach theorem for locally convex spaces, which allow us to generalize both [ContinuousLinearMap.exist_extension_of_finiteDimensional_range](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Module/HahnBanach.html#ContinuousLinearMap.exist_extension_of_finiteDimensional_range) and [Submodule.ClosedComplemented.of_finiteDimensional](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Module/HahnBanach.html#Submodule.ClosedComplemented.of_finiteDimensional) (I also moved these two lemmas to the new file I created). Some helper lemmas about continuity of seminorms/linear functions are added. Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis delegated	185/57	Mathlib.lean,Mathlib/Analysis/LocallyConvex/HahnBanach.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Seminorm.lean	5	17	['ADedecker', 'CoolRmal', 'github-actions', 'j-loreaux', 'mathlib-bors']	ADedecker assignee:ADedecker	1-49678 1 day ago	8-31425 8 days ago	10-63110 10 days

Review status

There are currently 486 PRs awaiting review. Among these,

12 are labelled easy (these ones),
4 are addressing technical debt (namely these), and
204 appeared on the review queue within the last two weeks.

On the other hand, 152 PRs are unassigned and have not seen a status change in three days, and 35 PRs are assigned and have seen no review movement in two weeks.

These are triage-oriented views, not the main review queue. Updating a PR may remove it from one of these lists, but does not remove it from the review queue unless the PR's status changes out of awaiting review.

Needs triage: unassigned PRs on the review queue

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
35619	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Clique): intersection and union of cliques	Plus a couple of lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	29/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Data/Set/Pairwise/Basic.lean	1	13	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	1	86-15021 2 months ago	25-41423 25 days ago	47-17441 47 days
34952	joneugster author:joneugster	feat(scripts/autolabel): use `Cli` and integrate `curl` call into `autolabel`	- use `Cli` for `lake exe autolabel` - add arguments `--pr xxx --gh` and `--pr xxx --curl ` to chose between different interaction methods with github - add `--force` to skip the check whether labels are already present. (note: the current `curl` setup doesn't perform this step and neither does the refactor, so I added a `Todo` to remember this. ) - make CI-workflow simpler and more robust by removing current stdout-parsing of the debug-messages which `autolabel` emits. ### Testing Make some local changes and commit them. Ensure your local `origin/master` is in sync with `upstream/master` if you are on a fork. - `lake exe autolabel`: prints the labels which would be applicable - `lake exe autolabel --pr 34952 --gh --force` adds these labels to this PR using `gh`. - `lake exe autolabel --pr 34952 --gh` adds these labels to this PR using `gh` if no topic labels are present. - `lake exe autolabel --pr 34952 --curl ` adds these labels to this PR using `curl`. This requires a github access token for authentication --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	85/72	.github/workflows/add_label_from_diff.yaml,scripts/autolabel.lean	2	4	['github-actions', 'mathlib-merge-conflicts']	nobody	none	67-13662 2 months ago	50-60671 50 days ago	83-15102 83 days
33506	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): construct a cycle of two distinct paths with same start and end	Co-authored-by: Vlad Tsyrklevich Co-authored-by: Snir Broshi <26556598+SnirBroshi@users.noreply.github.com> --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	109/1	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	4	60	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	2	65-59018 2 months ago	11-5272 11 days ago	28-65685 28 days
37690	yuanyi-350 author:yuanyi-350	feat(Combinatorics/Enumerative/Bell): sum over partition shapes	## Summary - add multiplicative lemmas relating `Multiset.bell` when inserting a part - prove `Nat.bell` as a sum of `Multiset.bell` over partition shapes - Kill TODO in `Mathlib/Combinatorics/Enumerative/Bell.lean` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	153/16	Mathlib/Combinatorics/Enumerative/Bell.lean	1	1	['github-actions']	nobody	none	41-74359 1 month ago	42-72984 42 days ago	42-72977 42 days
37642	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph): tidy various files	--- Concept inspired by @Ruben-VandeVelde :) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	89/72	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Subwalks.lean	8	2	['SnirBroshi', 'github-actions']	nobody	none	41-38318 1 month ago	41-38378 41 days ago	43-55008 43 days
37697	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Clique): add theorems about cliques and induced graphs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	22/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	9	['Rida-Hamadani', 'SnirBroshi', 'github-actions']	nobody	1	39-26486 1 month ago	42-50931 42 days ago	42-50924 42 days
36764	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `DirectSum.lequivCongrLeft_lof`: unchanged 🎉 * `AnalyticOnNhd.preimage_mem_codiscreteWithin`: unchanged 🎉 * `mem_permsOfList_of_mem`: unchanged 🎉 * `PNat.mod_le`: unchanged 🎉 * `Computation.map_parallel`: unchanged 🎉 * `Sigma.curry_update`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		11/41	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Sigma/Basic.lean	6	13	['chenson2018', 'euprunin', 'github-actions', 'mathlib-merge-conflicts']	nobody	none	37-77177 1 month ago	37-77237 37 days ago	62-49009 62 days
37055	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `OreLocalization.smul'_char`: unchanged 🎉 * `Equiv.Perm.cycleOf_mem_cycleFactorsFinset_iff`: unchanged 🎉 * `StrictMono.ite'`: unchanged 🎉 * `Mathlib.Meta.NormNum.isInt_ediv`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		10/29	Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Tactic/NormNum/DivMod.lean	4	11	['chenson2018', 'euprunin', 'github-actions']	nobody	none	37-74817 1 month ago	37-74878 37 days ago	55-72455 55 days
37700	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Maps): add `Iso.induceIso`	Similar to `induceHom` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	29/0	Mathlib/Combinatorics/SimpleGraph/Maps.lean	1	3	['github-actions', 'vlad902']	nobody	none	37-33730 1 month ago	37-33788 37 days ago	42-46098 42 days
37865	Jun2M author:Jun2M	feat(Combinatorics/Graph): Edge cut of `Graph`	This PR introduces - `edgeCut`: A function on set of vertices that returns the set of edges with exactly one end in the set. - `IsEdgeCut`: A predicate for set of edges that promises it is `edgeCut` of some set. - `IsBridge`: An edge `e` is a bridge iff it is a singleton edge cut. - `IsBond`: An edge Set `B` is bond iff it is minimal nonempty edge cut. --- - [x] depends on: #35879 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	194/0	Mathlib/Combinatorics/Graph/Connected/EdgeCut.Lean,Mathlib/Combinatorics/Graph/Subgraph.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	none	33-31546 1 month ago	33-49203 33 days ago	33-49634 33 days
37420	artie2000 author:artie2000	refactor: change definitions to avoid `ConvexCone`	Change the definitions of `PointedCone.positive` and `PointedCone.closure` to avoid mentioning `ConvexCone`. This PR is part of a series deprecating `ConvexCone`: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/with/582738985 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	10/4	Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	3	32-61115 1 month ago	32-61079 32 days ago	47-81635 47 days
36774	euprunin author:euprunin	chore: replace long terminal `rw […]`:s (≥4 lemmas) with bare `simp`:s	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `Finset.lcm_union`: unchanged 🎉 * `Finset.gcd_union`: unchanged 🎉 * `Polynomial.derivative_eval₂_C`: unchanged 🎉 * `Polynomial.expand_pow`: unchanged 🎉 * `Cardinal.mk_real`: unchanged 🎉 * `Real.log_zpow`: unchanged 🎉 * `Matroid.eRank_le_encard_add_eRk_compl`: unchanged 🎉 * `DFinsupp.single_tsub`: unchanged 🎉 * `EReal.inv_neg`: unchanged 🎉 * `Finsupp.toMultiset_map`: unchanged 🎉 * `Finsupp.single_tsub`: unchanged 🎉 * `Multiset.countP_map`: unchanged 🎉 * `Nat.ascFactorial_eq_factorial_mul_choose'`: unchanged 🎉 * `Real.sign_intCast`: unchanged 🎉 * `Real.volume_eball`: unchanged 🎉 * `Real.volume_closedEBall`: unchanged 🎉 * `LFunction_ne_zero_of_not_quadratic_or_ne_one`: 295 ms before, 152 ms after 🎉 * `hasSum_one_div_nat_pow_mul_cos`: unchanged 🎉 * `inv_eq_of_aeval_divX_ne_zero`: unchanged 🎉 * `AlgebraicIndependent.aeval_comp_mvPolynomialOptionEquivPolynomialAdjoin`: unchanged 🎉 * `Ordinal.deriv_mul_eq_opow_omega0_mul`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		22/24	Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Real/Sign.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,Mathlib/NumberTheory/ZetaValues.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	19	2	['artie2000', 'euprunin', 'github-actions']	nobody	1	32-33386 1 month ago	62-41912 62 days ago	62-41905 62 days
38141	Jun2M author:Jun2M	feat(Order/Partition): Partition induced by symmetric, transitive relation	We introduce a constructor for Partition from a symmetric, transitive relation, with `copy` function baked into the definition. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	41/7	Mathlib/Order/Partition/Basic.lean	1	1	['github-actions']	nobody	none	32-10495 1 month ago	32-10562 32 days ago	32-10555 32 days
38185	Jun2M author:Jun2M	feat(Order/Partition): operations over Frame	This PR introduces: * `Partition.induce`: The induce of a partition by a frame element. * `Partition.disjUnion`: The disjoint union of two partitions. * `Partition.bind`: The finer partition obtained by family of partitions for each part of the original partition. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	89/11	Mathlib/Order/Partition/Basic.lean,Mathlib/Order/SupIndep.lean	2	1	['github-actions']	nobody	none	31-27881 1 month ago	31-27953 31 days ago	31-27946 31 days
38245	RemyDegenne author:RemyDegenne	feat: CountableSupClosed	Define the property for a set of being closed by countable supremum (resp. infimum). The new file is adapted from the `SupClosed` file, which describes sets closed by binary supremum. Also use `to_dual` on `SupClosed`. `CountableInfClosed` will be used in measure theory, for developments related to compact systems used for Kolmogorov's extension theorem and Choquet's capacitability theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order brownian	308/66	Mathlib.lean,Mathlib/Order/CountableSupClosed.lean,Mathlib/Order/SupClosed.lean	3	14	['RemyDegenne', 'b-mehta', 'github-actions', 'vihdzp']	nobody	none	29-45667 29 days ago	29-59917 29 days ago	29-64634 29 days
32282	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): unoriented angle bisection	Add lemmas giving unoriented angles involving the incenter and excenters of a triangle as expressions involving dividing angles of the triangle by 2, deduced from oriented bisection lemmas. --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #31205 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32259 - [ ] depends on: #32260 - [ ] depends on: #32270 - [ ] depends on: #32273 - [ ] depends on: #32278 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	98/0	Mathlib/Geometry/Euclidean/Angle/Incenter.lean	1	8	['github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'wwylele']	nobody	1	29-13670 29 days ago	52-37622 52 days ago	52-38351 52 days
38036	JovanGerb author:JovanGerb	feat: `NSMul`/`NPow` type class	This PR is adds `NSMul`, `NPow`, `ZSMul` and `ZPow` classes for the `nsmul`, `npow`, `zsmul`, `zpow` data fields. This has a few advantages: - If you first declare a `SMul` instance, then you don't need to manually write `nsmul := (· • ·)` and `zsmul := (· • ·)` . For `Pow`, the extra benefit is that inferring the instance is preferred over the default field `npowRecAuto`. So this helps avoid accidental diamonds. - If you first declare a `SMul` instance on a type synonym, then `inferInstanceAs` will infer the `nsmul` field from the `SMul` instance. This makes it easier to avoid diamonds on type synonyms like `Matrix` and `MonoidAlgebra`. - The not-yet-merged instance diamond linter will be able to detect cases where the `NSMul` and `SMul` classes do not agree. In the process of making this PR, I have identified two existing `NPow` diamonds: - In `Mathlib.Algebra.Order.Positive.Field`, there were two conflicting `NPow` instances. - For `Fin`, there are two conflicting `NPow` instances. I have overwritten the one in core lean with the one from mathlib that is more computationally efficient. TODO: the same for `QSMul` and `NNQSMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		276/273	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Action/Opposite.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Opposite.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean,Mathlib/LinearAlgebra/Matrix/ZPow.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,MathlibTest/instance_diamonds.lean	41	16	['JovanGerb', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-radar', 'vihdzp']	nobody	none	27-53273 27 days ago	27-54165 27 days ago	27-54448 27 days
38337	Jun2M author:Jun2M	feat(Combinatorics/Graph): supremum	This PR introduces the union of `Graph`, as `sup`. Due to compatibility issue, in general, `sup` is not very well-behaved: `SemilatticeSup` is not true. In the case of incompatible edge, unlike `inf` which simply removed such edge, we include it following its incidence in the left graph. This has the benefit of associativity being true in general at the cost of commutativity. Assuming compatibility or existence of mutual supergraph, which are shown to be equivalent in this PR, everything behaves nicely. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	86/1	Mathlib/Combinatorics/Graph/Lattice.lean	1	2	['github-actions', 'vihdzp']	nobody	none	27-26021 27 days ago	27-50794 27 days ago	27-50787 27 days
38356	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Finset): `sSup s ≠ ⊤` in a `CompleteLinearOrder` for a finite set without `⊤`	--- btw `to_dual` here is blocked on #35213 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	20/0	Mathlib/Order/ConditionallyCompleteLattice/Finset.lean	1	1	['github-actions']	nobody	none	27-10739 27 days ago	27-10814 27 days ago	27-10807 27 days
38325	Jun2M author:Jun2M	feat(Combinatorics/Graph): EndPoint function	This PR introduces `endPoints`: `Set` of incident vertices, given an edge (in the case of non-edge, return empty). Import change: `Graph/Basic` now imports `Data/Set/Card` to allow reasoning about card of `endPoints`. [Relavent Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/513188-CSLib/topic/New.20graph.20definitions/with/588616269) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics large-import	83/3	Mathlib/Combinatorics/Graph/Basic.lean	1	9	['Jun2M', 'SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	none	26-17737 26 days ago	26-26567 26 days ago	27-82903 27 days
38393	staroperator author:staroperator	refactor(ModelTheory): add typeclasses for algebraic symbols	`Language.ring` and `Language.presburger` share the same symbols `0`, `1` and `+` and have duplicated instances on `Term` and `realize` simp lemmas. This PR makes these symbols certain typeclasses (similar to [`Language.IsOrdered`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/ModelTheory/Order.html#FirstOrder.Language.IsOrdered)) and removes the duplication. It also adds certain definability lemmas that `fun_prop` can use. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	332/201	Mathlib.lean,Mathlib/ModelTheory/Algebra/Classes.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Definability.lean	7	1	['github-actions']	nobody	none	26-5431 26 days ago	26-5489 26 days ago	26-7034 26 days
38422	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Maps): `G →g G.map f`	The existing `SimpleGraph.Embedding.map` takes an embedding and lifts it to a graph embedding `G ↪g G.map f`. #36130 generalized `SimpleGraph.map` from embeddings to functions, so now we can get a graph homomorphism `G →g G.map f` without requiring that `f` is injective, although we still have to require that it is injective on adjacent vertices (aka a valid coloring). This adds `Coloring.homMap`, and `Hom.map` which is identical but avoids coloring terminology/spelling. --- I'd love for suggestions to improve the docstring of `Coloring.homMap`, I'm not sure about it :) Are the two versions a good idea, or should we just have the coloring one? (we have `{Hom,Embedding,Iso}.comap` but only `{Embedding,Iso}.map`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	16/0	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	4	['SnirBroshi', 'eric-wieser', 'github-actions']	nobody	none	25-8028 25 days ago	25-43205 25 days ago	25-43255 25 days
38424	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Coloring/VertexColoring): `chromaticNumber ⊤` and other small lemmas	- Golf `isEmpty_of_colorable_zero` and rename to `Colorable.isEmpty` - `colorable_one_iff`: `G.Colorable 1 ↔ G = ⊥` - Combine `chromaticNumber_eq_zero_of_isEmpty`/`isEmpty_of_chromaticNumber_eq_zero` into `chromaticNumber_eq_zero_iff : G.chromaticNumber = 0 ↔ IsEmpty V` and deprecate the `→` side - `chromaticNumber_top_eq_enat_card`: `chromaticNumber ⊤ = ENat.card V` - Tag `chromaticNumber_top_eq_top_of_infinite`/`chromaticNumber_eq_zero_of_isEmpty` as `simp` - Golf `chromaticNumber_eq_one_iff` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	33/26	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean	1	3	['SnirBroshi', 'github-actions', 'vlad902']	nobody	none	24-31214 24 days ago	25-39328 25 days ago	25-39759 25 days
38498	SnirBroshi author:SnirBroshi	feat(Order/RelIso/Basic): lift a function to an order morphism into `Relation.Map` or from `Function.onFun`	For an `α`-relation `r` we have: ``` mapRelHom (f : α → β) : r →r Relation.Map r f f mapRelEmbedding (f : α ↪ β) : r ↪r Relation.Map r f f mapRelIso (f : α ≃ β) : r ≃r Relation.Map r f f ``` For a `β`-relation `r` we have: ``` onFunRelHom (f : α → β) : r.onFun f →r r onFunRelEmbedding (f : α ↪ β) : r.onFun f ↪r r onFunRelIso (f : α ≃ β) : r.onFun f ≃r r ``` --- These are pretty similar to `SimpleGraph.{Embedding/Iso}.map` and `SimpleGraph.{Hom/Embedding/Iso}.comap`, as [`comap`](https://github.com/leanprover-community/mathlib4/blob/9268b22206b0425419498769f780a91dee03bcf3/Mathlib/Combinatorics/SimpleGraph/Maps.lean#L117-L118) on graphs is a wrapper around `onFun`, and [`map`](https://github.com/leanprover-community/mathlib4/blob/9268b22206b0425419498769f780a91dee03bcf3/Mathlib/Combinatorics/SimpleGraph/Maps.lean#L57-L58) on graphs is almost a wrapper around `Relation.Map`. btw `@[simps]` is angry at me when I try to use it on the structures that use spread syntax. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	42/0	Mathlib/Order/RelIso/Basic.lean	1	1	['github-actions']	nobody	none	24-1381 24 days ago	24-1456 24 days ago	24-1449 24 days
38344	robo7179 author:robo7179	feat(SimpleGraph/Coloring/VertexColoring): Matching is 2 colorable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	51/0	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean	1	5	['SnirBroshi', 'github-actions', 'vlad902']	nobody	none	23-63704 23 days ago	27-31248 27 days ago	27-31627 27 days
38222	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemmas about isomorphism and girth	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	19/1	Mathlib/Combinatorics/SimpleGraph/Girth.lean	1	6	['IvanRenison', 'SnirBroshi', 'github-actions', 'vlad902']	nobody	none	23-47326 23 days ago	30-22239 30 days ago	30-22232 30 days
38528	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Paths): some cycle lemmas are true for circuits	Add `IsCircuit.{not_of_nil,ne_bot,three_le_length}` by using their corresponding `IsCycle` proofs. Also golfs a bit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	17/9	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	none	23-46230 23 days ago	23-46300 23 days ago	23-46293 23 days
38531	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Paths): `Walk.map` preserves more properties	Adds some missing theorems about how `Walk.map` behaves with `IsTrail`/`IsPath`/`IsCircuit`/`IsCycle`. Summary of what we have now, with the 8 new theorems and 2 renames marked: ``` IsTrail.of_map : (p.map f).IsTrail → p.IsTrail -- new map_isTrail_iff_of_injective : f.Injective → (p.map f).IsTrail ↔ p.IsTrail IsTrail.map : f.Injective → p.IsTrail → (p.map f).IsTrail -- renamed from map_isTrail_of_injective IsPath.of_map : (p.map f).IsPath → p.IsPath map_isPath_iff_of_injective : f.Injective → (p.map f).IsPath ↔ p.IsPath IsPath.map : f.Injective f → p.IsPath → (p.map f).IsPath -- renamed from map_isPath_of_injective IsCircuit.of_map : (p.map f).IsCircuit → p.IsCircuit -- new map_isCircuit_iff_of_injective : f.Injective → (p.map f).IsCircuit ↔ p.IsCircuit -- new IsCircuit.map : f.Injective → p.IsCircuit → (p.map f).IsCircuit -- new IsCycle.of_map : (p.map f).IsCycle → p.IsCycle -- new map_isCycle_iff_of_injective : f.Injective → (p.map f).IsCycle ↔ p.IsCycle IsCycle.map : f.Injective → p.IsCycle → (p.map f).IsCycle mapLe_isTrail : G ≤ G' → (p.mapLe h).IsTrail ↔ p.IsTrail IsTrail.of_mapLe : G ≤ G' → (p.mapLe h).IsTrail → p.IsTrail IsTrail.mapLe : G ≤ G' → p.IsTrail → (p.mapLe h).IsTrail mapLe_isPath : G ≤ G' → (p.mapLe h).IsPath ↔ p.IsPath IsPath.of_mapLe : G ≤ G' → (p.mapLe h).IsPath → p.IsPath IsPath.mapLe : G ≤ G' → p.IsPath → (p.mapLe h).IsPath mapLe_isCircuit : G ≤ G' → (p.mapLe h).IsCircuit ↔ p.IsCircuit -- new IsCircuit.of_mapLe : G ≤ G' → (p.mapLe h).IsCircuit → p.IsCircuit -- new IsCircuit.mapLe : G ≤ G' → p.IsCircuit → (p.mapLe h).IsCircuit -- new mapLe_isCycle : G ≤ G' → (p.mapLe h).IsCycle ↔ p.IsCycle IsCycle.of_mapLe : G ≤ G' → (p.mapLe h).IsCycle → p.IsCycle IsCycle.mapLe : G ≤ G' → p.IsCycle → (p.mapLe h).IsCycle ``` --- Also golfs `map_isPath_of_injective`/`IsPath.of_map`/`map_isTrail_iff_of_injective`, they don't need induction. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	47/31	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	none	22-54888 22 days ago	23-28968 23 days ago	23-28961 23 days
38549	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Copy): `Is(Ind)Contained` `completeGraph` lemmas	- `G ⊑ completeGraph V` - `G ⊑ completeGraph W ↔ Nonempty (V ↪ W)` - `completeGraph V ⊴ completeGraph W ↔ Nonempty (V ↪ W)` - `G ⊴ completeGraph W → G = ⊤` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	12/0	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	1	['github-actions']	nobody	none	22-52805 22 days ago	22-52874 22 days ago	22-52867 22 days
38529	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Girth): `egirth ⊤ = 3` when there are at least 3 vertices	Since `Nontrivial` is not enough, we use the condition `3 ≤ ENat.card α`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	17/0	Mathlib/Combinatorics/SimpleGraph/Girth.lean	1	5	['SnirBroshi', 'github-actions', 'vlad902']	nobody	none	22-52748 22 days ago	23-43465 23 days ago	23-43458 23 days
37835	YaelDillies author:YaelDillies	doc(Algebra/Order): update mentions of `OrderedSemiring` and friends	As of #20676, it was replaced by `IsOrderedRing`. Not all docs were straightforward to update. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order label:t-algebra$	123/280	Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/OrderedCancelAddCommMonoidWithBounds.lean,Mathlib/Algebra/Group/Subgroup/Order.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Set/Monoid.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Order/WithTop/Untop0.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/Order/Filter/Germ/OrderedMonoid.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Valuation.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/Tactic/NormNum/Ineq.lean	37	9	['NoahW314', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts']	nobody	none	22-44684 22 days ago	22-44709 22 days ago	37-39836 37 days
38568	SnirBroshi author:SnirBroshi	feat(SimpleGraph/Connectivity/Subgraph): `w.toSubgraph.IsInduced ↔ w.IsChordless`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	nobody	none	21-86056 21 days ago	21-86126 21 days ago	21-86119 21 days
38554	YaelDillies author:YaelDillies	chore(Combinatorics/SimpleGraph): use the auto-param in `loopless` more	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	5/13	Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Order/Cover.lean	8	6	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	none	21-33304 21 days ago	21-65645 21 days ago	21-67707 21 days
38027	8e7 author:8e7	feat(Combinatorics/SimpleGraph/Star): define star graphs	Add a new definition `starGraph` and several key lemmas. Star graphs are a trivial class of tree, often used in constructive proofs regarding trees. An example use case is shown in #38334. --- All lemmas are hand written first, then golfed with the help of Claude Code. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	85/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Star.lean	2	39	['8e7', 'IvanRenison', 'JovanGerb', 'SnirBroshi', 'github-actions', 'vihdzp', 'vlad902']	nobody	none	21-5297 21 days ago	33-5243 33 days ago	35-3501 35 days
38364	openendings author:openendings	feat: create Order/DirectedCompletePartialOrder/Defs.lean	Define DirectedCompletePartialOrder and its interaction with iSup and sSup. --- A DirectedCompletePartialOrder is equivalently: - a partial order with LUBs of nonempty directed sets; - what happens when you remove ⊥ from a CompletePartialOrder; or - a ConditionallyCompletePartialOrder in which every directed set is BddAbove. Like CPOs, DCPOs are commonly studied in denotational semantics. Potential applications: - [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/590070848) -- defining infinite sums in an DCPO-enriched `AddCommMonoidWithTop` such as `ENat` or `ENNReal`. - [#Is there code for X? > Scott Induction](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Scott.20Induction/with/590112858) -- fixpoint theorems similar to `OmegaCompletePartialOrder`, generalised to arbitrary cardinalities. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	123/0	Mathlib.lean,Mathlib/Order/DirectedCompletePartialOrder/Defs.lean,docs/references.bib	3	4	['SnirBroshi', 'github-actions', 'openendings']	nobody	none	20-21560 20 days ago	26-11680 26 days ago	26-72899 26 days
37073	kim-em author:kim-em	feat: add wrap_instance% using core's wrapInstance	This PR adds a new `wrap_instance%` term elaborator that delegates to Lean core's `wrapInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `wrap_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.wrapInstance`. Like `fast_instance%`, it reduces instances to constructor applications and reuses canonical sub-instances. Unlike `fast_instance%`, it works at `instances` transparency and delegates all normalization logic to core. The replaced sites cover: - Equiv/type-alias transfers (WithAbs, WithConv, WithVal, WithLp, TransferInstance) - Surjective constructors (Con, RingCon quotients, module congruences) - DFunLike leaf instances (MultilinearMap, ContinuousMultilinearMap, AlternatingMap, Intertwining) - Quotient instances (LinearAlgebra/Quotient/Defs) - inferInstanceAs% sites (StandardPart, Presentation/Core) - Miscellaneous (InfiniteAdeleRing, ZMod) This PR doesn't attempt to replace all `fast_instance%`; it gets more complicated! 🤖 Prepared with Claude Code		88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/WithConv.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	16	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	none	20-5821 20 days ago	20-5848 20 days ago	22-79349 22 days
38432	SnirBroshi author:SnirBroshi	feat(Logic/Relation): `Map r f g ≤ s ↔ r ≤ s.bicompl f g`	and the dual `s ≤ Relation.Map r f g ↔ s.bicompl f g ≤ r` which requires `f` and `g` to be bijective. Adds `Galois{Connection/Insertion/Coinsertion}` for the dual. The theorems are specialized to `onFun` instead of `bicompl` for when `f = g`. The `≤` theorems are spelled using `Subrelation` since `≤` is not yet available in this file, and `∀` for the `bicompl` theorems since `Subrelation` only supports homogeneous relations. A `GaloisConnection` for the iff in the title requires `f`/`g` to be bijective, but then we can get an `OrderIso` which is stronger (see #38499). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	119/28	Mathlib/Logic/Relation.lean,Mathlib/Order/GaloisConnection/Basic.lean	2	3	['SnirBroshi', 'github-actions', 'plp127']	nobody	none	19-78968 19 days ago	23-86181 23 days ago	25-21196 25 days
38612	SnirBroshi author:SnirBroshi	feat(Order/SuccPred/CompleteLinearOrder): `sSup s < x` iff theorems when we know if `x` is a successor pre-limit or not	Adds the following theorems (along with their duals and indexed versions): ```lean sSup_lt_iff_of_not_isSuccPrelimit : ¬IsSuccPrelimit x → sSup s < x ↔ ∀ a ∈ s, a < x le_sSup_iff_of_not_isSuccPrelimit : ¬IsSuccPrelimit x → x ≤ sSup s ↔ ∃ a ∈ s, x ≤ a Order.IsSuccPrelimit.sSup_lt_iff : IsSuccPrelimit x → sSup s < x ↔ ∃ a < x, ∀ b ∈ s, b < a Order.IsSuccPrelimit.le_sSup_iff : IsSuccPrelimit x → x ≤ sSup s ↔ ∀ a < x, ∃ b ∈ s, a ≤ b ``` They are similar to these existing theorems, but not the same: ```lean sSup_lt_iff : sSup s < x ↔ ∃ a < x, ∀ b ∈ s, b ≤ a le_sSup_iff_forall_lt : x ≤ sSup s ↔ ∀ a < x, ∃ b ∈ s, a < b ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	43/0	Mathlib/Order/SuccPred/CompleteLinearOrder.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	nobody	none	19-78769 19 days ago	20-75683 20 days ago	20-75676 20 days
38349	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph/Coloring/VertexColoring): rename to `Vertex.lean`	After #37525 moved `Coloring.lean` to `Coloring/VertexColoring.lean`, a [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500) poll decided to avoid duplicating the word "Coloring", so this renames `Coloring/VertexColoring.lean` to `Coloring/Vertex.lean`. --- I planned to make this move in #33313 but it isn't moving along, so I think it's best to split the renaming. #37546 adds module deprecation [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-combinatorics	6/6	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Partition.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean	7	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	19-13427 19 days ago	19-13453 19 days ago	27-13592 27 days
38748	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Basic): `G.edgeSet ⊆ s.sym2 ↔ G.support ⊆ s`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	19/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	2	1	['github-actions']	nobody	none	19-7831 19 days ago	19-7903 19 days ago	19-7896 19 days
37930	vlad902 author:vlad902	chore(SimpleGraph): move `cycleGraph` to its own file	PR #34797 re-defined `cycleGraph` independent of `circulantGraph`. Now move the definition of `cycleGraph` to its own file so that the definition can be used without importing the algebra hierarchy. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	173/148	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	3	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	18-82738 18 days ago	18-82761 18 days ago	18-83141 18 days
37832	YaelDillies author:YaelDillies	chore(Algebra/Order/GroupWithZero): flatten `Unbundled` folder	The algebraic order classes are unbundled now. --- More thought is needed to do the same for `Algebra.Order.Monoid` since filenames conflict. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra t-order label:t-algebra$	20/20	Mathlib.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Algebra/Order/GroupWithZero/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Bounds.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/GroupWithZero/OrderIso.lean,Mathlib/Algebra/Order/GroupWithZero/Submonoid.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Nonneg/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean	19	3	['github-actions', 'mathlib-merge-conflicts']	nobody	none	18-47623 18 days ago	18-47649 18 days ago	37-52759 37 days
38747	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Basic): more `neighborSet` and `IsIsolated` lemmas	--- `neighborSet_mono` moved from `Maps.lean` to `Basic.lean` with a simpler proof [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	72/17	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	4	2	['github-actions', 'vlad902']	nobody	none	18-18017 18 days ago	18-24973 18 days ago	18-79255 18 days
37870	Jun2M author:Jun2M	feat(Combinatorics/Graph): `Simple` typeclass for `Graph`	This PR introduces two type classes on `Graph`: `Loopless` and `Simple`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	93/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Simple.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	18-10556 18 days ago	18-10580 18 days ago	37-45006 37 days
38716	YaelDillies author:YaelDillies	feat(Algebra/Order): `NNRat.cast_sub`	From AddCombi --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	29/22	Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/NNRat/Order.lean,Mathlib/Data/Rat/Star.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/Topology/Instances/Rat.lean	10	1	['github-actions']	nobody	none	17-78319 17 days ago	17-78383 17 days ago	17-82759 17 days
38795	YaelDillies author:YaelDillies	feat(Algebra/Group/Action/Pointwise): `#(s ∩ (a • t)) = #{x ∈ s ×ˢ t \| x.1 / x.2 = a}`	The `Finset` lemma already exists. From AddCombi --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/18	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean	3	1	['github-actions']	nobody	none	17-72112 17 days ago	17-72172 17 days ago	17-74383 17 days
38142	SnirBroshi author:SnirBroshi	feat(Order/SuccPred/CompleteLinearOrder): generalize `csSup_mem_of_not_isSuccLimit`	Given `s.Nonempty` and `BddAbove s` we can conclude `sSup s ∈ s` using either: - `csSup_mem_of_not_isSuccPrelimit`, given `ConditionallyCompleteLinearOrder` and `¬IsSuccPrelimit (sSup s)` - `csSup_mem_of_not_isSuccLimit`, given `ConditionallyCompleteLinearOrderBot` and `¬IsSuccLimit (sSup s)` We generalize both to a theorem that requires `ConditionallyCompleteLinearOrder` and `¬IsSuccLimit (sSup s)`. This creates 8 theorems that require `¬IsSuccPrelimit` but are now easily proved with the `¬IsSuccLimit` theorems, we replace `csSup_mem_of_not_isSuccPrelimit`/`exists_eq_ciSup_of_not_isSuccPrelimit` with their primed `ConditionallyCompleteLinearOrderBot` theorems, and deprecates the other 6. Tags a random `to_dual` (in `ConditionallyCompleteLattice/Basic.lean`) to let us `to_dual`ize the new lemmas. --- ~~Should we also deprecate the 8 theorems that require `¬IsSuccPrelimit` and now use `mt`?~~ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	55/42	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/SetTheory/Cardinal/Order.lean	3	9	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	none	17-7253 17 days ago	17-7277 17 days ago	32-5676 32 days
38841	SnirBroshi author:SnirBroshi	feat(Mathlib/Order/SuccPred/Limit): more `WithTop` lemmas about `IsMin`/`CovBy`/`IsSuccLimit`	--- Continues the work from #38244 We should probably also have such lemmas for `WithTopBot`/`WithBotTop`, but that's for another day [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	111/30	Mathlib/Order/Cover.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/Order/WithBot.lean	3	1	['github-actions']	nobody	none	16-63215 16 days ago	16-73731 16 days ago	16-74531 16 days
38316	tannerduve author:tannerduve	feat(Order/OmegaCompletePartialOrder): least fixed point and Scott induction	Adds `ContinuousHom.lfp` for endomorphisms on an ωCPO with `⊥`, as the `ωSup` of the iterate chain from `⊥`, together with `map_lfp`, `isFixedPt_lfp`, `lfp_le_fixed`, `isLeast_lfp`, and the Scott induction theorem `lfp_induction` (specialized from a more general seed-based `ωSup_iterate_induction`). For `Part.fix`, adds: * `Part.exists_mem_approx_of_mem_fix`: if `y ∈ Part.fix g x`, some finite approximation of `g` already contains `y`. * `Part.Fix.approx_eq_iterate_bot` and `Part.Fix.approxChain_eq_iterateChain`: bridges between `Fix.approx`/`approxChain` and `f^[n] ⊥`/`iterateChain`. * `Part.fix_eq_lfp`: `Part.fix g = ContinuousHom.lfp (.ofFun g hc)` when `g` is ω-Scott continuous. * `Part.fix_scott_induction`: Scott induction specialized to `Part.fix`. * `Part.fix_induction_mem`: membership induction on `Part.fix`, derived from `fix_scott_induction`.	new-contributor	114/0	Mathlib/Control/LawfulFix.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,docs/references.bib	3	2	['github-actions']	nobody	none	16-38040 16 days ago	28-14142 28 days ago	28-14661 28 days
38589	vlad902 author:vlad902	feat(SimpleGraph): add universal vertex predicate	Add the predicate `G.IsUniversal v` to indicate that `v` is a universal vertex, i.e. connected to all other vertices in `G`. This matches the recently added `G.IsIsolated v` predicate for isolated vertices. Co-authored-by: Justin Lai --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	63/10	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean	5	4	['8e7', 'github-actions', 'vlad902']	nobody	none	15-84160 15 days ago	21-30481 21 days ago	21-30474 21 days
38358	yuanyi-350 author:yuanyi-350	doc(1000.yaml): note more formalised theorems	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation maintainer-merge	9/2	docs/1000.yaml	1	12	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp', 'yuanyi-350']	nobody	none	15-68117 15 days ago	15-68179 15 days ago	26-69828 26 days
38890	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Basic): more `WithTop` instances	Adds the following instances: ``` CompleteLattice α → CompleteLattice (WithTop α) CompleteLinearOrder α → CompleteLinearOrder (WithBot α) ConditionallyCompleteLinearOrder α → ConditionallyCompleteLinearOrder (WithTop α) ConditionallyCompleteLinearOrder α → ConditionallyCompleteLinearOrderBot (WithBot α) ``` and some simp lemmas to help. --- These `#synth`s all succeed after this PR: (code) ```lean variable {α : Type} [Preorder α] #synth Preorder αᵒᵈ #synth Preorder <\| WithTop α #synth Preorder <\| WithBot α #synth Preorder <\| WithTopBot α #synth Preorder <\| WithBotTop α variable {α : Type} [PartialOrder α] #synth PartialOrder αᵒᵈ #synth PartialOrder <\| WithTop α #synth PartialOrder <\| WithBot α #synth PartialOrder <\| WithTopBot α #synth PartialOrder <\| WithBotTop α variable {α : Type} [LinearOrder α] #synth LinearOrder αᵒᵈ #synth LinearOrder <\| WithTop α #synth LinearOrder <\| WithBot α #synth LinearOrder <\| WithTopBot α #synth LinearOrder <\| WithBotTop α variable {α : Type} [CompleteLattice α] #synth CompleteLattice αᵒᵈ #synth CompleteLattice <\| WithTop α -- new #synth CompleteLattice <\| WithBot α #synth CompleteLattice <\| WithTopBot α #synth CompleteLattice <\| WithBotTop α variable {α : Type} [CompleteLinearOrder α] #synth CompleteLinearOrder αᵒᵈ #synth CompleteLinearOrder <\| WithTop α #synth CompleteLinearOrder <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLattice α] #synth ConditionallyCompleteLattice αᵒᵈ #synth ConditionallyCompleteLattice <\| WithTop α #synth ConditionallyCompleteLattice <\| WithBot α #synth CompleteLattice <\| WithTopBot α #synth CompleteLattice <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLinearOrder α] #synth ConditionallyCompleteLinearOrder αᵒᵈ #synth ConditionallyCompleteLinearOrder <\| WithTop α -- new #synth ConditionallyCompleteLinearOrderBot <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLinearOrderBot α] #synth ConditionallyCompleteLinearOrder αᵒᵈ #synth CompleteLinearOrder <\| WithTop α #synth ConditionallyCompleteLinearOrderBot <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	63/9	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean	1	1	['github-actions']	nobody	none	15-16439 15 days ago	15-16515 15 days ago	15-16508 15 days
38871	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph): add parity lemmas for outer and inner vertices	Adds three lemmas to `SimpleGraph.DegreeSum`: - `sum_degrees_option_zmod_two`: the handshaking lemma for `Option I` over ZMod 2 - `degree_none_zmod_two_eq_sum`: simp-normal form of the above - `card_degree_one_option_eq_outer_zmod_two`: under degree bound ≤ 2, count of degree-1 inner vertices equals outer vertex degree mod 2	t-combinatorics new-contributor	65/3	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	6	['0xTerencePrime', 'SnirBroshi', 'github-actions']	nobody	none	15-1125 15 days ago	15-57753 15 days ago	15-57746 15 days
38897	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SetFamily): formalize 1D Sperner's Lemma parity	Formalizes the 1-dimensional Sperner's Lemma (parity version): given a coloring of the `n + 1` vertices of a subdivided line segment with two colors (`ZMod 2`), if the two endpoints have different colors, then the number of color-changing edges is odd. This is distinct from `IsAntichain.sperner` in `SetFamily.LYM`, which concerns antichains in a power set. This file formalizes the topological/combinatorial parity statement used as the base case in higher-dimensional Sperner arguments. ## Key declarations - `SpernerColoring`: type-safe coloring via `Fin (n + 1) → ZMod 2` - `edgeDiff`: color difference on adjacent vertices, computed in `ZMod 2` - `totalDiff`: telescoping sum of all edge differences - `diffEdges`: the `Finset` of bichromatic (color-changing) edges - `sperner_1d`: main theorem — `Odd (diffEdges c).card` ## Design notes - Using `Fin (n + 1) → ZMod 2` instead of `ℕ → ZMod 2` makes boundary conditions unrepresentable at the type level, eliminating out-of-bounds cases entirely. - The proof reduces to a telescoping sum in `ZMod 2`, using `CharTwo.add_self_eq_zero` to cancel all interior vertices, avoiding parity case splits. This is intended as the 1D base case, the approach generalizes to higher-dimensional Sperner's Lemma in future work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	133/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Sperner1D.lean	2	3	['github-actions', 'grunweg']	nobody	none	14-78759 14 days ago	15-2509 15 days ago	15-2502 15 days
38895	emlis42 author:emlis42	chore(Algebra/ContinuedFractions): golf	This PR simplifies some proofs in `Algebra/ContinuedFractions`	t-algebra new-contributor label:t-algebra$	39/63	Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean	7	2	['github-actions']	nobody	none	14-11475 14 days ago	14-16686 14 days ago	15-4982 15 days
36815	EtienneC30 author:EtienneC30	feat: a measurable space structure on the type of continuous maps	Endow the type `C(X, Y)` of continuous maps from `X` to `Y` with the Borel sigma-algebra coming from the compact-open topology and show that, under some assumptions on `X` and `Y`, this is equal to the restriction of the product sigma-algebra over `X → Y`. Provide a measurable equivalence between `{f : X → Y // Continuous f}` and `C(X, Y)`. Co-authored-by: @RemyDegenne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology brownian t-measure-probability	256/0	Mathlib.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/ContinuousMap.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Separation/Regular.lean	6	27	['ADedecker', 'EtienneC30', 'felixpernegger', 'github-actions', 'mathlib-merge-conflicts']	nobody	none	13-72872 13 days ago	13-72912 13 days ago	53-68255 53 days
38951	thomaskwaring author:thomaskwaring	feat(Order/PrimeSeparator): remove unnecessary hypotheses	In `mem_ideal_sup_principal`, boundedness and distributivity were unused, and in `prime_ideal_of_disjoint_filter_ideal`, boundedness was only used to produce an element of the filter `F`, which is already nonempty by definition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	9/19	Mathlib/Order/PrimeSeparator.lean	1	2	['github-actions']	nobody	none	13-71450 13 days ago	13-71537 13 days ago	13-71530 13 days
38667	SnirBroshi author:SnirBroshi	feat(Order/Hom/Basic): equivalences of `Order{Hom/Embedding/Iso}`	- `OrderHom`s are equivalent to `RelHom`s of `LE` (unlike `OrderEmbedding`/`OrderIso` they aren't defined using it) - Congruence equivs for `OrderEmbedding`/`OrderIso` when the two sides are order-isomorphic. This already exists for `OrderHom`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	55/1	Mathlib/Order/Hom/Basic.lean	1	3	['SnirBroshi', 'dagurtomas', 'github-actions']	nobody	none	13-22100 13 days ago	13-22100 13 days ago	20-19614 20 days
38975	ldct author:ldct	feat(EReal): Add equations for EReal	Add equational lemmas for the simplifier to simplify `[natural number literal] + ⊤` in `EReal`, and add a test file in `MathlibTest/EReal.lean`. Without these lemmas, `simp` fails to close many of the goals in `MathlibTest/EReal.lean`. I believe simp should close all of them. An alternative is to add something like this as a simp lemma, to allow `top_add_of_ne_bot` to make progress, but it's not clear to me that this is desirable as a simp lemma, since it's not equational ``` example {n : ℕ} [n.AtLeastTwo] : (ofNat(n) : EReal) ≠ ⊤ := by exact Ne.symm (not_eq_of_beq_eq_false rfl) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	32/0	Mathlib/Data/EReal/Operations.lean,MathlibTest/EReal.lean	2	2	['github-actions', 'vihdzp']	nobody	none	13-17867 13 days ago	13-20855 13 days ago	13-20848 13 days
38557	SnirBroshi author:SnirBroshi	feat(Order/Monotone/Defs): weaken `Preorder` to `LE`/`LT`	`Monotone`/`Antitone`/`MonotoneOn`/`AntitoneOn` can use any `LE`, and `StrictMono`/`StrictAnti`/`StrictMonoOn`/`StrictAntiOn` can use any `LT`. This makes it necessary to add some explicit type params (e.g. `(α := α)`) in some places that use monotone-related theorems (e.g. `Function.monotone_eval`). --- Currently `OrderEmbedding` and `OrderIso` can use `LE` but `OrderHom` requires `Preorder` because it's defined using `Monotone`. Generalizing `Monotone` and friends will let us fix this oddity. This follows other basic definitions such as `IsMax`/`CovBy`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	21/15	Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Order/Interval/Lex.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/Topology/Order/MonotoneConvergence.lean	7	2	['JovanGerb', 'github-actions']	nobody	none	12-70697 12 days ago	22-14298 22 days ago	22-17122 22 days
38989	grunweg author:grunweg	chore: remove `(d)simp only []`	Either remove them (when they were unnecessary), or replace by something more low-level. --- I'm happy to make them `simp only` instead, if that is preferred. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		10/17	Counterexamples/AharoniKorman.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/RE.lean,Mathlib/Computability/TuringMachine/Config.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/ModelTheory/Encoding.lean	11	4	['b-mehta', 'github-actions', 'grunweg']	nobody	none	12-57539 12 days ago	12-72807 12 days ago	12-72800 12 days
38979	ldct author:ldct	feat(EReal): simplify nat + ⊤	Alternative version of https://github.com/leanprover-community/mathlib4/pull/38975 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	28/2	Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,MathlibTest/EReal.lean	3	6	['SnirBroshi', 'eric-wieser', 'github-actions', 'ldct', 'leanprover-radar']	nobody	none	12-52382 12 days ago	12-52148 12 days ago	12-52271 12 days
37718	SabrinaJewson author:SabrinaJewson	feat(Order): add conversions from `Std` order typeclasses to Mathlib ones	`{Preorder, PartialOrder, LinearOrder}.ofStd` exist to facilitate convenient translation from `Std` order typeclasses to Mathlib ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	366/0	Mathlib.lean,Mathlib/Order/Std.lean,MathlibTest/OrderOfStd.lean	3	2	['github-actions']	nobody	none	12-13670 12 days ago	42-16581 42 days ago	42-17067 42 days
39004	zhuyizheng author:zhuyizheng	chore(ModelTheory): fix hypo of `realize_liftAt`	changes the hypo of `realize_liftAt` from the incorrect `(hmn : m + n' ≤ n + 1)` to the correct `(hmn : m ≤ n)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	2/2	Mathlib/ModelTheory/Semantics.lean	1	3	['github-actions', 'plp127', 'zhuyizheng']	nobody	none	12-12611 12 days ago	12-48740 12 days ago	12-48733 12 days
38310	ZRTMRH author:ZRTMRH	feat(Combinatorics/Quiver/Schreier): word evaluation and reachability	Adds word evaluation and reachability results to the Schreier graph API. * `SchreierGraph.evalWord` : evaluates a word `List (S × Bool)` as an element of the ambient group, where `(s, true)` contributes `ι s` and `(s, false)` contributes `(ι s)⁻¹`. * `SchreierGraph.evalWord_eq_lift` : agreement with `FreeGroup.lift`. * `SchreierGraph.evalWord_mem_closure` : every word evaluates into the subgroup generated by `ι`. * `SchreierGraph.pathFromWord` : a Bool-tagged word yields a path in `Symmetrify (SchreierGraph V ι)` from `x` to `evalWord ι w • x`. * `SchreierGraph.reachable_iff` : two vertices are connected by a path in the symmetrification iff some element of the subgroup closure carries one to the other. Follow-up to #36320. This PR was written with AI assistance (Claude). The code has been reviewed by the author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics large-import LLM-generated	157/0	Mathlib/Combinatorics/Quiver/Schreier.lean	1	2	['github-actions']	nobody	none	11-85465 11 days ago	28-32539 28 days ago	28-32532 28 days
39023	TBUGTB author:TBUGTB	feat(Algebra/Order): API lemmas on floor and abs	Co-authored-by: Etienne Marion @EtienneC30 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra brownian new-contributor label:t-algebra$	9/0	Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Ring/Abs.lean	2	3	['TBUGTB', 'github-actions']	nobody	none	11-67191 11 days ago	11-70380 11 days ago	11-70373 11 days
39029	felixpernegger author:felixpernegger	chore: remove redundant `unfold`s	This PR removed roughly (estimated by files I went through) half of the `unfold`'s in mathlib which can be removed such that the proof still works (found by searching `unfold ` in VSCode in manually going through ~600/1100 occurences). I originally planned to replace all, but I couldn't find any relevant discussion if this is actually a good practice, so to save potentially wasted time, I make this PR now. (similarly with the `clear` tactic) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		63/108	Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Orthogonality.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Graph/Delete.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TuringMachine/PostTuringMachine.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/List/Intervals.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Nat/Digits/Div.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Prime.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Data/ZMod/Basic.lean	44	3	['felixpernegger', 'github-actions', 'leanprover-radar']	nobody	none	11-60310 11 days ago	11-64897 11 days ago	11-64890 11 days
39059	vihdzp author:vihdzp	feat: `IsBotOneClass (Associates M)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/9	Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/RingTheory/ChainOfDivisors.lean	2	1	['github-actions']	nobody	none	11-13770 11 days ago	11-13846 11 days ago	11-15865 11 days
39078	fpvandoorn author:fpvandoorn	feat: add lemmas about products over Finset.Iio	* Mostly useful for `ℕ` * I added the `Finset.Iic` lemmas by symmetry, but I'm happy to remove them if we think they are redundant. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/0	Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean	1	1	['github-actions']	nobody	none	10-57836 10 days ago	10-57916 10 days ago	10-57909 10 days
39091	tb65536 author:tb65536	feat(FieldTheory/Galois/IsGaloisGroup): add version of `IsGaloisGroup.to_isFractionRing` assuming only `IsIntegral`	This PR adds a version of `IsGaloisGroup.to_isFractionRing` assuming only `Algebra.IsIntegral A B` (which is weaker than the existing assumption `Finite G`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	22/9	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/RingTheory/Invariant/Basic.lean	2	1	['github-actions']	nobody	none	10-44444 10 days ago	10-44444 10 days ago	10-44438 10 days
39074	tb65536 author:tb65536	feat(RingTheory/RamificationInertia/Ramification): relate `ramificationIdx'` to `Algebra.IsUnramifiedAt`	This PR relates the new `ramificationIdx'` (which will eventually replace `ramificationIdx`) to `Algebra.IsUnramifiedAt`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra large-import label:t-algebra$	30/0	Mathlib/RingTheory/RamificationInertia/Ramification.lean	1	1	['github-actions']	nobody	none	10-34800 10 days ago	10-50456 10 days ago	10-50450 10 days
38859	SnirBroshi author:SnirBroshi	feat(Order/CompleteLattice/Basic): tag `iSup_of_empty'` with `@[simp]`	The theorem says `iSup f = sSup ∅` when the domain of `f` is empty, and dually `iInf f = sInf ∅`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	31/47	Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/ENat/Lattice.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/LinearAlgebra/Eigenspace/Pi.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Lift.lean	14	1	['github-actions']	nobody	none	9-79589 9 days ago	15-69481 15 days ago	15-73250 15 days
38464	xroblot author:xroblot	feat(FieldTheory/Galois/IsGaloisGroup): generalize mulEquivCongr	Generalizes `mulEquivCongr` from field extensions to domain extensions. The field version is renamed to `mulEquivCongr'`. Also adds some simp lemmas. --- - [x] depends on: #38377	t-algebra label:t-algebra$	56/15	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	none	9-78990 9 days ago	10-46681 10 days ago	10-47728 10 days
38328	astrainfinita author:astrainfinita	feat: `OrderSupSet`	This PR introduces `OrderSupSet` and `OrderInfSet`, which are typeclasses expressing that `sSup` (resp., `sInf`) returns the least upper bound (resp., the greatest lower bound) of a set whenever one exists. This allows us to prove properties about the `sSup` of specific sets (such as `∅`, singletons, finite sets, and `univ`) without any typeclasses asserting the existence of LUBs. For example, `sSup ∅ = ⊥` holds for any type equipped with `OrderBot` `OrderSupSet`, no longer requiring typeclasses like `ConditionallyCompleteLinearOrderBot`. For a general set `s`, this gives a uniform way to extend results about `IsLUB s a → motive a` to `motive (sSup s)`, `motive (⨆ i, f i)`, `motive (a ⊔ b)`, etc., which allows proof reuse for basic API such as [`csSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/ConditionallyCompleteLattice/Basic.html#csSup_insert), [`iSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#iSup_insert), and [`sSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#sSup_insert) and downstream code like [`csSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#csSup_add), [`sSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#sSup_add), and [`sup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Lattice.html#sup_add). Furthermore, this allows us to refactor incrementally, reducing the dependency of results about various completeness typeclasses on the specific implementation of `sSup`. --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	156/73	Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/SetNotation.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	7	16	['JovanGerb', 'astrainfinita', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'openendings', 'vihdzp']	nobody	1	9-77346 9 days ago	9-77385 9 days ago	15-21686 15 days
38234	vihdzp author:vihdzp	chore: make `IsSuccLimit` a structure	This lets us name the fields. Note that the `mk_iff` lemma overwrites a recently deprecated theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	40/33	Mathlib/Order/SuccPred/InitialSeg.lean,Mathlib/Order/SuccPred/Limit.lean	2	5	['github-actions', 'plp127']	nobody	none	9-75150 9 days ago	9-75221 9 days ago	25-63501 25 days
39123	SnirBroshi author:SnirBroshi	chore(Data/Matrix/Basic): mention `mopMatrix` in `transpose{Ring/Alg}Equiv`s docstring and vice versa	- `RingEquiv.mopMatrix` and `transposeRingEquiv` differ by a `ᵐᵒᵖ` since the latter assumes `CommMagma α` instead of `Mul α` - `AlgEquiv.mopMatrix` and `transposeAlgEquiv` differ by a `ᵐᵒᵖ` since the latter assumes `CommSemiring α` instead of `Semiring α` --- Also slightly golfs `RingEquiv.mopMatrix` as a drive-by. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	18/11	Mathlib/Data/Matrix/Basic.lean	1	1	['github-actions']	nobody	none	9-35806 9 days ago	9-35888 9 days ago	9-35881 9 days
38896	peabrainiac author:peabrainiac	feat(Algebra): multiplicative torsors	Introduce a class `Torsor` for torsors of multiplicative groups, as a multiplicative counterpart to the existing `AddTorsor` for torsors of additive groups. --- Adopted / migrated from #8608. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra file-removed label:t-algebra$	643/544	Mathlib.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Torsor/Basic.lean,Mathlib/Algebra/Torsor/Defs.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Defs.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/Group/AddTorsor.lean,Mathlib/Topology/Algebra/MulAction.lean,scripts/noshake.json	14	2	['github-actions', 'grunweg']	nobody	none	8-84021 8 days ago	8-84094 8 days ago	15-1374 15 days
38855	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Indexed): `≤` version of `ciSup_or'` for `ConditionallyCompleteLattice`	Deprime `ciSup_or'` because there's no `ciSup_or`, and add a `≤` version (and dual) for `ConditionallyCompleteLattice`. Only `≤` because equality does not hold when `p ≠ q` without `sSup ∅ = ⊥`. --- `ciSup_or'` can't have a dual because there's no dual to `ConditionallyCompleteLinearOrderBot`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	8/1	Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	1	1	['github-actions']	nobody	none	8-74387 8 days ago	16-9195 16 days ago	16-9188 16 days
38856	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Indexed): `iSup_iSup_eq_{left/right}` for `ConditionallyCompleteLinearOrderBot`	and `≤` versions for `ConditionallyCompleteLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	32/9	Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	2	1	['github-actions']	nobody	none	8-74224 8 days ago	16-2114 16 days ago	16-2107 16 days
38837	kbuzzard author:kbuzzard	feat: add "higher instance priority" library note	We add a library note explaining the logic in making instances like `Semiring.toModule` higher priority than the default. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #38704 [only because one of the claims in the note is false without it]		19/0	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Module/Defs.lean	4	5	['github-actions', 'kbuzzard', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	8-33640 8 days ago	8-33414 8 days ago	9-20178 9 days
38489	Jun2M author:Jun2M	feat(Topology/Algebra/InfiniteSum): Generalize ENNReal lemmas	This PR generalizes many theorems in Topology/Algebra/InfiniteSum/ENNReal.lean from `ENNREal` to any type that satisfies a list of order-related instances, mostly `[CommMonoid α] [CompleteLattice α] [CanonicallyOrderedMul α] [TopologicalSpace α] [SupConvergenceClass α]` Deprecation of the original `ENNReal` lemmas are done in the next PR: #38193. Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		261/3	Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean	4	7	['Jun2M', 'SnirBroshi', 'github-actions', 'wwylele']	nobody	none	8-25021 8 days ago	8-25098 8 days ago	24-15136 24 days
39186	kbuzzard author:kbuzzard	perf(RingTheory/LaurentSeries): add some instances	Typeclass inference was expensively failing at some point in `LaurentSeries.valuation_compare` without these instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discovered by getting Claude Code to edit Lean's typeclass inference algorithm and then compile lean and mathlib and see what breaks. Found out that typeclass inference is going down a big hole in this file; this fixes the hole.	t-ring-theory	9/0	Mathlib/RingTheory/LaurentSeries.lean	1	3	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	none	7-69254 7 days ago	7-70790 7 days ago	7-70783 7 days
39190	tb65536 author:tb65536	chore(RingTheory/LocalRing/ResidueField/Fiber): namespace file	This PR adds an `Ideal` namespace to `Fiber.lean` and adds a deprecation for one declaration that should be in this namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	9/3	Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean	1	1	['github-actions']	nobody	none	7-67935 7 days ago	7-67935 7 days ago	7-67929 7 days
39157	vihdzp author:vihdzp	feat: `Nat.cast` commutes with addition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		26/9	Mathlib/Data/Nat/Cast/Commute.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	2	['github-actions', 'plp127']	nobody	none	7-52703 7 days ago	8-27768 8 days ago	8-27761 8 days
39196	tb65536 author:tb65536	feat(RingTheory/LocalRing/ResidueField/Fiber): the localization of `Ideal.Fiber` is a quotient	This PR proves that the localization of `Ideal.Fiber` is a quotient. This will be applied in #39189 to prove the ramification-inertia formula for finite flat extensions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	48/0	Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean	1	1	['github-actions']	nobody	none	7-51382 7 days ago	7-51382 7 days ago	7-51377 7 days
37464	martinwintermath author:martinwintermath	feat(Geometry/Convex/Cone): Minor additions to pointed cones	Minor additions to pointed cones: * `PointedCone.ofSubmodule_le_ofSubmodule` and `PointedCone.ofSubmodule_lt_ofSubmodule`. These are not made simp lemmas, instead the underlying `Submodule.restrictScalars_le` and `Submodule.restrictScalars_lt` have been changed into simp lemmas. * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` Co-authored by: Artie Khovanov --- In preparation of #36605. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	22/16	Mathlib/Algebra/Module/Submodule/RestrictScalars.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	24	['YaelDillies', 'artie2000', 'github-actions', 'justus-springer', 'martinwintermath', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	4	7-49899 7 days ago	9-76711 9 days ago	47-3329 47 days
37716	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Determinant): Desnanot-Jacobi identity	This PR adds the Desnanot-Jacobi identity (also known as the Lewis Carroll identity or Dodgson condensation): for any (n+2)×(n+2) matrix M over a commutative ring, $$\det(M) \cdot \det(M_{1,n}^{1,n}) = \det(M_1^1) \cdot \det(M_n^n) - \det(M_1^n) \cdot \det(M_n^1)$$ The proof follows Bressoud's Proofs and Confirmations (Cambridge University Press, 1999): multiply M by an auxiliary matrix built from columns of the adjugate, then compare determinants. This yields the identity premultiplied by det(M). To cancel, we pass to a universal polynomial ring (an integral domain with nonzero determinant), then specialize back to arbitrary commutative rings. It seems there's some interest in adding this: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Determinantal.20identity.20and.20the.20Cauchy.20matrix.20determinant/with/582946873 ---	t-algebra new-contributor label:t-algebra$	217/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Determinant/DesnanotJacobi.lean	2	13	['SnirBroshi', 'github-actions', 'grunweg', 'kim-em', 'slavanaprienko']	nobody	none	7-31404 7 days ago	7-31158 7 days ago	8-69381 8 days
39219	WenrongZou author:WenrongZou	feat(FieldTheory/Finite): add variant theorems for `expand_card`	Add `MvPolynomial, MvPowerSeries, PowerSeries` version of `FiniteField.expand_card`, which is only for polynomial. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	45/4	Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/FiniteField.lean,Mathlib/RingTheory/MvPolynomial/Expand.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/PowerSeries/Expand.lean	5	1	['github-actions']	nobody	none	7-28090 7 days ago	7-28131 7 days ago	7-28356 7 days
37951	martinwintermath author:martinwintermath	chore(Geometry/Convex/Cone): rework `PointedCone.dual` to take a cone as input in place of a set	Rework `PointedCone.dual` to take as input a cone instead of a set. This is done to untangle the functionality of `PointedCone.dual` from `PointedCone.hull` and to align it with the signature of its submodule analogue `Submodule.orthogonalBilin` (partially, with proposed functionality from #34007). See also the discussion here: [#mathlib4 > Reorganizing bilinearity and orthogonality?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Reorganizing.20bilinearity.20and.20orthogonality.3F/with/583882414). Main changes: * change signature `dual (s : Set M)` to `dual (C : PointedCone R M)`. * deprecate `dual_hull` since now obsolete in this form, instead add `mem_dual_hull` in addition to `mem_dual`. * deprecate all of `dual_empty`, `dual_zero` and `dual_singleton_zero` in favor of only `dual_bot`. * deprecate `dual_univ` in favor of `dual_top`. * add notation `R ∙₊ x` in analogy to submodule version `R ∙ x`, for use in new lemma `dual_hull_singleton`. * deprecate `dual_insert` since now obsolete (use `Submodule.span_insert` instead). * deprecate `dual_union`, `dual_iUnion` and `dual_sUnion` in favor of `dual_sup`, `dual_sSup` and `dual_iSup`. * remove `dual_sup` since now obsolete and name has been reused (see above). * add `dual_sup_ker` and `dual_univ_eq_ker` to align with (proposed) submodule analogue for `Submodule.orthogonalBilin`. * deprecate `dual_image` in favor of `dual_map` * add `hull_eq` (cone version of `span_eq`) since used in `basis_coord_mem_dual`. * adjust doc-strings Numerous changes to other files have been necessary. The dual-variants for proper cones or inner product spaces have not yet been adapted to cone-inputs, though this should happen eventually. The definition of `DualFG` has been changed to "duals of `FG`-cones" instead of "duals of finite sets" (also getting rid of `Finset` as previously requested). --- - [x] depends on: #37950 - [x] depends on: #37542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		227/128	Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/TensorProduct.lean,Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/DualFinite.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean	7	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	7-24571 7 days ago	7-24610 7 days ago	20-30731 20 days
39225	junodeveloper author:junodeveloper	feat(SimpleGraph): add odd degree corollaries	This PR adds three small corollaries of the handshaking lemma for odd-degree vertices in `SimpleGraph`: * `card_odd_degree_vertices_ne_one` * `not_existsUnique_odd_degree` * `even_degree_of_forall_ne_even_degree` These are convenience lemmas around the existing `even_card_odd_degree_vertices` / `exists_ne_odd_degree_of_exists_odd_degree` API. Local checks: ```bash lake build Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe lint-style Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe runLinter Mathlib.Combinatorics.SimpleGraph.DegreeSum ``` ## AI usage disclosure I used OpenClaw/Codex to help explore the existing API, draft the small proofs, and run local checks. I reviewed the final code myself and understand the statements and proofs in this PR.	t-combinatorics new-contributor	21/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	2	['github-actions']	nobody	none	7-21131 7 days ago	7-22463 7 days ago	7-22456 7 days
39212	emlis42 author:emlis42	feat(Algebra/ContinuedFractions): add `partNums!` and `partDens!`	This PR adds `partNums!` and `partDens!`, which provide infinite stream representations for the sequences of partial numerators and denominators of a generalized continued fraction.	t-algebra new-contributor label:t-algebra$	8/0	Mathlib/Algebra/ContinuedFractions/Basic.lean	1	4	['emlis42', 'github-actions', 'grunweg']	nobody	none	7-9733 7 days ago	7-42452 7 days ago	7-42445 7 days
39239	alainchmt author:alainchmt	feat(FieldTheory/Finite): irreducible polynomial divides X^q^n - X iff degree divides n	--- Add the theorem saying that, for an irreducible polynomial `f` over a finite field `K`, the degree of `f` divides `n` if and only if `f` divides `X ^ (Nat.card K) ^ n - X`. Include auxiliary lemmas. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	34/0	Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Minpoly/Field.lean	2	2	['github-actions']	nobody	none	6-68345 6 days ago	6-68434 6 days ago	6-68427 6 days
39195	linesthatinterlace author:linesthatinterlace	feat(Logic/Function/Defs): Add dcomp lemmas	This PR adds API lemmas about `dcomp` that were previously missing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	13/0	Mathlib/Logic/Function/Defs.lean	1	6	['github-actions', 'linesthatinterlace', 'plp127']	nobody	none	6-57604 6 days ago	7-59103 7 days ago	7-59096 7 days
39208	urkud author:urkud	chore(Algebra/Polynomial): golf	Use existing lemmas instead of reinventing the wheel. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	5/18	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean	2	1	['github-actions']	nobody	none	6-48223 6 days ago	7-45729 7 days ago	7-45722 7 days
39230	bryangingechen author:bryangingechen	chore: extract API from #38807 and golf	I wanted to understand why these two proofs in #38807 were long (and also play around more with the API in this corner of the library) so I walked through them with Claude Opus. prepared with Claude code	t-order LLM-generated	23/37	Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/DirSupClosed.lean	2	2	['github-actions', 'vihdzp']	nobody	1	6-21967 6 days ago	7-10203 7 days ago	7-10196 7 days
39256	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): add monotonicity lemma for LanguageOn	In Symbolic dynamics. Proof that the language of a set of configurations is monotone with respect to inclusion of configuration sets: X ⊆ Y → LanguageOn X U ⊆ LanguageOn Y U The proof is a direct unfolding of definitions: a pattern in the language of X comes from restricting some configuration x ∈ X, and inclusion X ⊆ Y allows the same witness to be used for Y. Related to issue #39252	t-dynamics new-contributor	9/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	3	['github-actions']	nobody	none	5-76495 5 days ago	6-51299 6 days ago	6-51292 6 days
39282	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): add union morphism lemma for LanguageOn	In symbolic dynamics. This PR proves that taking the language over a finite shape commutes with unions of configuration sets: $LanguageOn (X \cup Y) U = LanguageOn X U \cup LanguageOn Y U$ The proof is a direct unfolding of definitions: a pattern in the language of $X \cup Y$ comes from restricting a configuration $x ∈ X \cup Y$, and splitting on whether $x \in X$ or $x \in Y$ yields the corresponding inclusion in either $LanguageOn X U$ or $LanguageOn Y U$. The converse direction rebuilds a witness in $X \cup Y$ from either side of the union. Related to issue #39252	t-dynamics new-contributor	15/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	2	['github-actions']	nobody	none	5-76269 5 days ago	5-76354 5 days ago	5-76347 5 days
39294	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): prove LanguageOn monotonicity under intersection	In symbolic dynamics. This PR proves that taking the language over a finite shape is monotone with respect to intersections of configuration sets: ```math \mathrm{LanguageOn}(X \cap Y)\, U \subseteq \mathrm{LanguageOn}\, X\, U \cap \mathrm{LanguageOn}\, Y\, U ``` The proof is a direct unfolding of definitions: a pattern in the language of `X ∩ Y` comes from restricting a configuration `x ∈ X ∩ Y`. Since such an `x` belongs simultaneously to `X` and `Y`, the same restriction witness gives membership both in `LanguageOn X U` and in `LanguageOn Y U`, yielding membership in their intersection. Related to issue #39252	t-dynamics new-contributor	9/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	2	['github-actions']	nobody	none	5-67475 5 days ago	5-67558 5 days ago	5-67551 5 days
38902	xroblot author:xroblot	feat(FieldTheory/Galois/IsGaloisGroup): add `IsGaloisGroup.of_algEquiv` and `of_ringEquiv`	Add two constructors for `IsGaloisGroup`: - `IsGaloisGroup.of_algEquiv`: if `G` is a Galois group on `B/A` and `e : B ≃ₐ[A] B'` is `G`-equivariant, then `G` is a Galois group on `B'/A`. - `IsGaloisGroup.of_ringEquiv`: if `G` is a Galois group on `B/A` and `e : A ≃+* A'` is compatible with the algebra structures, then `G` is a Galois group on `B/A'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	31/0	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	5-64833 5 days ago	5-64873 5 days ago	11-15873 11 days
39061	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk/Paths): a trail which isn't a path has a cycle subwalk	- `p.IsPath ↔ ∀ (v : V) (w : G.Walk v v), w.IsSubwalk p → w.Nil` - `p.IsTrail → (p.IsPath ↔ ∀ (v : V) (w : G.Walk v v), w.IsSubwalk p → ¬w.IsCycle)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	28/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean	2	3	['Rida-Hamadani', 'github-actions']	nobody	none	5-62976 5 days ago	11-13144 11 days ago	11-13137 11 days
36388	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/AdjMatrix): submatrices and homomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	73/3	Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean	1	19	['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen']	nobody	1	5-62170 5 days ago	6-12348 6 days ago	35-49296 35 days
38974	Brian-Nugent author:Brian-Nugent	chore: fix documentation of `LocallyQuasiFinite`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry easy	6/5	Mathlib/AlgebraicGeometry/Morphisms/QuasiFinite.lean	1	1	['github-actions']	nobody	none	5-55891 5 days ago	13-24800 13 days ago	13-24793 13 days
39158	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/Rank): generalize `Matrix.rank`/`LinearMap.rank` to semirings	- Generalize `Matrix.rank` from `CommRing` to `CommSemiring` - Generalize `LinearMap.rank` from `AddCommGroup`s over `Ring`s to `AddCommMonoid`s over `Semiring`s (which are the minimum requirements for `Module`) - Many `Matrix.rank` theorems now require `StrongRankCondition` explicitly (which `CommRing` used to provide) - `Matrix.cRank` theorems don't need commutativity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	58/64	Mathlib/LinearAlgebra/Dimension/LinearMap.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean	2	1	['github-actions']	nobody	none	5-55879 5 days ago	8-23362 8 days ago	8-23355 8 days
39095	tb65536 author:tb65536	feat(FieldTheory/Galois/IsGaloisGroup): `IsGaloisGroup` instance for `FixedPoints.subalgebra`	This PR generalizes the existing `IsGaloisGroup` instance for `FixedPoints.intermediateField` to `FixedPoints.subalgebra`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	23/3	Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/GroupTheory/GroupAction/Defs.lean	3	6	['eric-wieser', 'github-actions', 'tb65536']	nobody	none	5-53085 5 days ago	9-28595 9 days ago	10-40847 10 days
39279	jayscambler author:jayscambler	feat(Cryptography/Sigma): Schnorr sigma protocol and signature scheme	Adds `Mathlib/Cryptography/Sigma/Schnorr.lean`. New file in a new top-level directory; mathlib currently has no `Mathlib/Cryptography/`, so I've taken `Mathlib/Cryptography/Sigma/` as the natural home for sigma-protocol formalizations. The file proves the three defining properties of Schnorr's identification scheme as a sigma protocol: - `Schnorr.correct`: completeness. Honest verifier accepts honest signer's transcript. - `Schnorr.specialSoundness`: from two accepting transcripts sharing the commitment but using different challenges `c, c'`, the witness `x = (s - s') / (c - c')` is recovered. Needs `q` prime so `c - c'` is invertible in `ZMod q`. - `Schnorr.hvzkAccepts`: the HVZK simulator `g^s · (y^c)⁻¹` always yields accepting transcripts. This is the structural-correctness half of HVZK only; the distributional indistinguishability statement is a separate result and not in this PR. On top of the sigma protocol there's `Schnorr.Signature.{keyGen, sign, verify, correct}` wrapping it as a Fiat-Shamir signature scheme; `Schnorr.Signature.correct` is a one-line corollary of `Schnorr.correct`. Two auxiliary lemmas, `Schnorr.gpow_sub` and `Schnorr.gpow_mul`, bridge `ZMod q` arithmetic and group exponentiation under `Fintype.card G = q`. They're local to this file for now because the surrounding `gpow` API is itself cryptography-specific; if a general `ZMod q`-graded group action framework lands in mathlib later, both lemmas would become instances of it. There's also a small `example` instantiating everything on `Multiplicative (ZMod q)` for `Fact q.Prime` to show the API typechecks. That instantiation is a toy (DLOG is trivial in that group), but it confirms the abstraction is usable. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	352/0	Mathlib.lean,Mathlib/Cryptography/Sigma/Schnorr.lean	2	2	['github-actions']	nobody	none	5-45787 5 days ago	5-45866 5 days ago	5-46349 5 days
35255	vlad902 author:vlad902	feat(SimpleGraph): `cycleGraph.IsContained` in every graph with a cycle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	35/0	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	5-42427 5 days ago	20-28899 20 days ago	20-29839 20 days
39291	MichaelStollBayreuth author:MichaelStollBayreuth	perf: change definition of EuclideanDomain class	This changes the definition of `EuclideanDomain` from ```lean class EuclideanDomain (R : Type) extends CommRing R, Nontrivial R where ... ``` to ```lean class EuclideanDomain (R : Type) [CommRing R] [Nontrivial R] where ... ``` with the goal to see how this affects performance (type class synthesis in particular). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra slow-typeclass-synthesis label:t-algebra$	35/57	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Order/AbsoluteValue/Euclidean.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Data/ZMod/Coprime.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbsoluteValue.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/Real/GoldenRatio.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/EuclideanDomain.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/NatInt.lean,Mathlib/RingTheory/Int/Basic.lean,Mathlib/RingTheory/Polynomial/Dickson.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Radical/Basic.lean,Mathlib/RingTheory/ZMod.lean,MathlibTest/instance_diamonds.lean	25	11	['MichaelStollBayreuth', 'github-actions', 'kbuzzard', 'leanprover-radar']	nobody	none	5-34923 5 days ago	5-37400 5 days ago	5-59956 5 days
34855	staroperator author:staroperator	feat(Order): use `to_dual` for `PFilter`	This PR redefines `PFilter` to get rid of `OrderDual` and uses `to_dual` to translate theorems. The whole file of `PFilter` is now deprecated. Some changes: - To align with `Filter`, the order on `PFilter` is changed to the reversed set inclusion. Ultrafilters, the dual notion of maximal ideals, become minimal in this order. - `to_dual` does not work on `sequenceOfCofinals`. I left `Order.Cofinal` and the Rasiowa–Sikorski lemma not `to_dual`-ized, and we should move them to a separate file later. - `IsLEChain` is added to tag `to_dual`. - `IsCoatom.isProper`/`IsCoatom.isMaximal` is deprecated by `Order.Ideal.isProper_of_isCoatom`/`Order.Ideal.isMaximal_of_isProper`, since this result is special to ideals while `IsCoatom` namespace should be for orders in general. --- - [x] depends on: #34820 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	292/242	Mathlib/Order/Atoms.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanAlgebra/Defs.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/PFilter.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/PrimeIdeal.lean,Mathlib/Order/PrimeSeparator.lean,Mathlib/Order/ZornAtoms.lean,Mathlib/RingTheory/IdealFilter/Basic.lean,Mathlib/RingTheory/IdealFilter/Topology.lean,Mathlib/Tactic/Translate/ToDual.lean	13	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	5-30208 5 days ago	5-29986 5 days ago	17-53291 17 days
37928	AlexeyMilovanov author:AlexeyMilovanov	refactor(Computability.Encoding): unbundle Γ and remove FinEncoding	This PR unbundles the alphabet `Γ` from the `Encoding` structure and completely removes `FinEncoding`. `Encoding`: The alphabet `Γ` is now an explicit parameter: `structure Encoding (α : Type u) (Γ : Type v)`. `FinEncoding`: Removed. Finiteness is now handled via standard typeclasses (e.g., `[Fintype Γ] (e : Encoding α Γ)`). Combinators: Functions like `finEncodingPair` are simplified to `encodingPair`, dropping the `fin` prefix and `[Fintype]` requirements where no longer needed. Downstream: Mechanically updated `Mathlib.Computability` and `Mathlib.ModelTheory` to pass the explicit `Γ` and use `[Fintype Γ]` where `FinEncoding` was previously required.	new-contributor maintainer-merge	87/67	Mathlib/Computability/Encoding.lean,Mathlib/ModelTheory/Encoding.lean	2	9	['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'vihdzp']	nobody	1	5-17258 5 days ago	11-68236 11 days ago	37-48085 37 days
38596	JJYYY-JJY author:JJYYY-JJY	Add basic row-equivalence and echelon-form API for matrices	This PR adds the first foundational slice of `Mathlib.LinearAlgebra.Matrix.Echelon`, a theorem-oriented API for elementary row operations, row-equivalence, and echelon-form predicates for matrices. The main additions are: * elementary row-scaling matrices and their `GL` versions; * `Matrix.RowEquivalent` for the left action of `GL m R` on rectangular matrices; * row-zero, pivot, echelon, and reduced-echelon predicates; * semantic representative predicates `Matrix.IsEchelonFormOf` and `Matrix.IsReducedEchelonFormOf`. This intentionally stops before row-space characterizations, existence and uniqueness of reduced echelon representatives, and the noncomputable canonical representative `Matrix.rref`; those are planned for later PRs. Co-authored-by: Joseph Qian Co-authored-by: Veer Shukla Co-authored-by: Dhruv Bhatia Co-authored-by: Zheng Wu <1036819072@qq.com> --- This update trims the original full row-reduction API in response to reviewer feedback that the PR was too large. It keeps only the foundation needed by later row-reduction and `rref` PRs.	t-algebra new-contributor label:t-algebra$	312/6	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Echelon.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean	3	10	['JJYYY-JJY', 'SnirBroshi', 'copilot-pull-request-reviewer', 'dagurtomas', 'github-actions', 'wwylele']	nobody	none	5-15536 5 days ago	5-18615 5 days ago	12-80431 12 days
39341	drocta author:drocta	feat(Algebra/Colimit/DirectLimit): add DirectLimit.(NonUnital)StarAlgebra.(lift/of) maps and associated lemmas	add the `of` and `lift` maps for `DirectLimit.StarAlgebra` and `DirectLimit.NonUnitalStarAlgebra`, as well as the associated lemmas, `of_f`, `lift_comp_of`, `lift_of`, and `hom_ext` for each. Also make `DirectLimit.NonUnitalAlgebra` only require `[Monoid R]` rather than `[CommSemiring R]`. --- Use of AI: I again asked ChatGPT for some advice about some things about this code. I can personally vouch for all of the code I'm submitting, and that I understand all of it. This is the third part of my project towards supporting direct limits of $C^∗$ -algebras (as I described [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Early.20feedback.20on.20approach.20towards.20formalizing.20UHF.20algebras.3F) ). This PR adds an import of `Mathlib.Algebra.Star.StarAlgHom` (because it needs `StarAlgHom` and `NonUnitalStarAlgHom`) replacing/encompassing the previously added imports of `Mathlib.Algebra.Star.StarRingHom` and `Mathlib.Algebra.Algebra.NonUnitalHom` (added in PR #38308 and #38672 respectively).	t-algebra new-contributor label:t-algebra$	100/3	Mathlib/Algebra/Colimit/DirectLimit.lean	1	2	['github-actions']	nobody	none	5-11810 5 days ago	5-14502 5 days ago	5-14495 5 days
39016	vihdzp author:vihdzp	chore: deprecate `WithZero.zero_le`	This is a duplicate of `zero_le` in the root namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra maintainer-merge label:t-algebra$	14/24	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/FieldTheory/RatFunc/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	4	2	['YaelDillies', 'github-actions']	nobody	1	5-7453 5 days ago	11-80410 11 days ago	11-82623 11 days
39347	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): refactor of Pattern and shift-invariance of shape languages for subshifts	## Summary This PR refactors Pattern.mulShift in Mathlib/Dynamics/SymbolicDynamics/Basic.lean and uses the cleaner definition to prove shift-invariance of the language of a subshift on a finite shape. ## Changes Pattern.mulShift now returns a Pattern instead of a configuration (more natural). - Old type: Pattern.mulShift : Pattern A G → G → (G → A) - New type: Pattern.mulShift : Pattern A G → G → Pattern A G - The result carries its support (p.support.image (v * ·)) and the default-outside-support proof, so callers don't have to re-derive them. The [IsLeftCancelMul G] hypothesis is moved to the lemmas that actually use it. - The definition Pattern.mulShift itself no longer needs left-cancellation (it only chooses a preimage noncomputably). - The hypothesis is now stated on mulShift_config_apply_mul_left_of_mem and mulOccursInAt_eq_cylinder directly, instead of being a section-level variable. Renames following the type change. - mulShift_apply_mul_left_of_mem → mulShift_config_apply_mul_left_of_mem (because we now write (p.mulShift v).config instead of p.mulShift v). New @[simp] and @[ext] lemmas for Pattern. - Pattern.ext: two patterns are equal iff their supports agree and their configurations agree on the support. - Pattern.mulShift_support: the support of p.mulShift v is p.support.image (v * ·). - Pattern.fromConfig_support: the support of fromConfig x U is U. - Pattern.fromConfig_config_of_mem: on its support, fromConfig x U agrees with x. New lemma Pattern.fromConfig_mulShift. For a left inverse g' * g = 1, shifting the pattern fromConfig x U by g equals fromConfig (mulShift g' x) (U.image (g * ·)). New theorem MulSubshift.languageOn_image_mulShift. For a subshift Y and elements g, g' with g * g' = 1 and g' * g = 1: (fun p => p.mulShift g) '' Y.languageOn U = Y.languageOn (U.image (g * ·)) i.e. the language on the translated shape is exactly the image of the language on U under the pattern-shift map. This gives a bijection between Y.languageOn U and Y.languageOn (U.image (g * ·)), with inverse p ↦ p.mulShift g'. Stated for left-cancellative monoids with an invertible element. Updated docstrings for Pattern.mulShift and the renamed lemma to reflect the bundled-Pattern return type and clarify which results need [IsLeftCancelMul G].	t-dynamics new-contributor	142/48	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	3	['github-actions']	nobody	none	5-7210 5 days ago	5-7371 5 days ago	5-7364 5 days
39218	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): make `p.Nil` the simpNF of `p = nil` and `p.length = 0`	These are equivalent, and `p.Nil` works even when the endpoints of the walk aren't defeq. [#graph theory > Deprecate `p = nil` in favor of `p.Nil`?](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Deprecate.20.60p.20.3D.20nil.60.20in.20favor.20of.20.60p.2ENil.60.3F/with/538017334) The main event is `Walk/Basic.lean`: - Swapped sides of `nil_iff_eq_nil` to create `eq_nil_iff_nil`, tagged `@[simp]` and deprecated the original - Changed the RHS of `length_eq_zero_iff` from `p = nil` to `p.Nil`, and generalized to non-closed walks - Deprecated `nil_iff_length_eq` which is the symmetric iff - Added `Nil.length_eq_zero` alias - Untagged `exists_length_eq_zero_iff` with `@[simp]` and added `exists_nil_iff` to replace it The rest is fixing everything that broke (or uses of now-deprecated lemmas), and: - [`Walk/Maps`] Added `nil_map_iff` to replace `map_eq_nil_iff` which is the same but with `.Nil` instead of `= nil` - [`Walk/Decomp`] Added `nil_rotate` to replace `rotate_eq_nil` which is the same but with `.Nil` instead of `= nil` --- Also renamed `set_walk_*` in `Counting.lean` to follow the naming convention. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	70/54	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Counting.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Traversal.lean	10	10	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	1	5-5918 5 days ago	6-53709 6 days ago	7-5866 7 days
37577	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): upgrade subset theorems to sublist/prefix/suffix	Upgrades theorems about `p.support ⊆ q.support` / `p.darts ⊆ q.darts` / `p.edges ⊆ q.edges` to `List.IsInfix`/`List.IsSuffix`/`List.Sublist`, which imply the subset versions. Also adds `cycleBypass` sublist lemmas that were missing, and golfs `length_bypass_le` and `bypass_eq_self_of_length_le` using the new sublist theorems. Co-authored-by: Iván Renison <85908989+IvanRenison@users.noreply.github.com> --- Except for a couple of `cycleBypass` ones, I did not add such theorems where there was no subset theorem to begin with (e.g. `(p.take n).darts <+: p.darts`), as they are usually not worth stating since they're trivial and simp proves them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	112/81	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	5	4	['YaelDillies', 'github-actions']	nobody	1	5-5900 5 days ago	6-52821 6 days ago	45-85191 45 days
39352	qawbecrdtey author:qawbecrdtey	chore(Data/Finset/Slice): remove unnecessary import	--- Remove import which was transitively being imported. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	0/1	Mathlib/Data/Finset/Slice.lean	1	1	['github-actions']	nobody	none	4-79697 4 days ago	4-79691 4 days ago	4-79809 4 days
38225	kim-em author:kim-em	ci: block merging PRs with large import increases unless reviewed	This PR makes the existing `large-import` label into a merge gate. PRs that significantly increase transitive imports (>2% for any modified file) are now blocked from merging until a reviewer adds the `allow-large-import` label. ### Why three labels? Bors's `block_labels` has no conditional logic — if a label is in the list, merge is blocked unconditionally. We need "blocked unless a reviewer has approved", i.e. `large-import ∧ ¬allow-large-import`. Since bors can't express that, we use a derived label: \| Label \| Managed by \| Purpose \| \|---\|---\|---\| \| `large-import` \| `build` job (import analysis) \| Factual: this PR increases imports \| \| `blocked-by-large-import` \| `check-large-import` job \| Operational: blocks bors \| \| `allow-large-import` \| Reviewer \| Override: reviewer approves the increase \| Each label is managed by exactly one actor, so there is no label-fighting. ### How it works 1. The existing `build` job adds/removes `large-import` based on import analysis (unchanged). 2. A new `check-large-import` job (in the same workflow) waits for `build` to finish, then: - If `large-import` is present and `allow-large-import` is absent → adds `blocked-by-large-import` - Otherwise → removes `blocked-by-large-import` 3. `blocked-by-large-import` is added to `block_labels` in `bors.toml`. When a reviewer adds `allow-large-import`, the `labeled` event re-triggers the workflow. The heavy `build` job is skipped (guarded by `github.event.action != 'labeled'`), but the lightweight `check-large-import` job runs, sees both labels, and removes `blocked-by-large-import`. Bors can now merge. ### Reviewer workflow The CI failure message tells the reviewer to consider whether the PR could be improved by splitting files, rearranging material, or creating new intermediate files. If the import increase is reasonable, they add `allow-large-import`. False positives can be reported on the [mathlib4 Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/large-import.20label). 🤖 Prepared with Claude Code	CI	78/2	.github/workflows/PR_summary.yml,bors.toml	2	7	['SnirBroshi', 'github-actions', 'jcommelin', 'joneugster', 'kim-em']	nobody	none	4-71720 4 days ago	28-18419 28 days ago	28-19030 28 days
37677	vihdzp author:vihdzp	feat: club sets	In set theory, a club set is a subset of an ordinal of uncountable cofinality, which is closed in the order topology, and unbounded within the ordinal. We generalize this notion to that of a club set in a well-order `α`: this is a set which is cofinal and closed under suprema. We recover the more standard notion by setting `α = Iio o`, whenever `ℵ₀ < o.cof`. We prove that club sets are closed under intersections of size less than the cofinality of `α`, and that the fixed points of a normal function are a club set. --- The idea is to eventually rework [`Ordinal.deriv`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/FixedPoint.html#Ordinal.deriv). This is simply the enumerator function for the fixed points of `f`, and enumerator functions for club sets are always normal. - [x] depends on: #37670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order maintainer-merge	181/13	Mathlib.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/FundamentalSequence.lean	8	17	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	2	4-69935 4 days ago	4-72874 4 days ago	26-3465 26 days
39288	FordUniver author:FordUniver	feat(Combinatorics/SimpleGraph/Subgraph): add `Embedding.ofIsInduced` and `IsInduced.map`	Three additions to the `SimpleGraph.Subgraph` API for induced subgraphs. `Embedding.ofIsInduced` is the canonical embedding of an induced subgraph into its ambient graph, paired with `toHom_ofIsInduced` and `ofIsInduced_apply` lemmas. This is the embedding counterpart of `Subgraph.hom`, which only produces a homomorphism because non-induced subgraphs do not reflect adjacency. `Subgraph.IsInduced.map` then records that the image of an induced subgraph under a graph embedding is induced, strengthened to `IsInduced.map_iff` for the iso case. --- Orthogonal pre-requisite of the `Copy` / `InducedCopy` refactor-feat stack. Extracted as a prerequisite from #38631 that is otherwise independent of the wider `Copy` / `InducedCopy` refactor-feat stack.	t-combinatorics	27/4	Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	2	15	['FordUniver', 'SnirBroshi', 'github-actions', 'mathlib-bors']	nobody	none	4-67866 4 days ago	5-46576 5 days ago	5-68133 5 days
37413	Paul-Lez author:Paul-Lez	feat(Combinatorics/Enumerative/Composition): add lemma about products of embeddings	Co-authored-by: Xavier Genereux [xaviergenereux@hotmail.com](mailto:xaviergenereux@hotmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	4/0	Mathlib/Combinatorics/Enumerative/Composition.lean	1	3	['github-actions', 'robin-carlier']	nobody	none	4-47671 4 days ago	5-45445 5 days ago	15-74386 15 days
39372	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable`	- rewrites `eisensteinSeriesSIF_mdifferentiable` to use `UpperHalfPlane.mdifferentiable_iff` directly and conclude from local uniform convergence of the Eisenstein series Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	1/5	Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable.lean	1	3	['github-actions', 'yuanyi-350']	nobody	none	4-44885 4 days ago	4-46619 4 days ago	4-46612 4 days
39373	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/CongruenceSubgroups`	- simplifies `Gamma_mem` to a single `simp` proof via `Gamma_mem'` and `SpecialLinearGroup.ext_iff` - shortens `ModularGroup_T_pow_mem_Gamma` and the `Gamma0` closure proofs with direct `simp`/`simpa` arguments Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/22	Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-44884 4 days ago	4-46617 4 days ago	4-46610 4 days
39374	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/Derivative`	- rewrites `normalizedDerivOfComplex_sub` to reuse the additive and negation lemmas instead of reproving the subtraction formula pointwise Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/10	Mathlib/NumberTheory/ModularForms/Derivative.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-44678 4 days ago	4-46614 4 days ago	4-46607 4 days
39375	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/SlashActions`	- streamlines `prod_slash_sum_weights` by letting `simp` handle the empty case and removing the redundant singleton split in the inductive step Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	1/5	Mathlib/NumberTheory/ModularForms/SlashActions.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-44521 4 days ago	4-46611 4 days ago	4-46604 4 days
39376	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/RamificationInertia/Basic`	- shortens `quotientToQuotientRangePowQuotSucc_surjective` by switching the ideal-factor argument to `irreducible_pow_sup` and `count_normalizedFactors_eq` after isolating the span hypotheses Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/10	Mathlib/NumberTheory/RamificationInertia/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-44349 4 days ago	4-46609 4 days ago	4-46602 4 days
39379	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/SmoothNumbers`	- simplifies the left inverse in `equivProdNatFactoredNumbers` by proving `¬ p ∣ m` once and then using `factorization_pow_self` and `factorization_eq_zero_of_not_dvd` Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/8	Mathlib/NumberTheory/SmoothNumbers.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-43695 4 days ago	4-46601 4 days ago	4-46594 4 days
39377	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/Divisors`	- refactors `properDivisors_eq_singleton_one_iff_prime`, `mem_properDivisors_prime_pow`, and `properDivisors_prime_pow` to use more direct divisor lemmas - rewrites `image_div_divisors_eq_divisors` via `map_div_left_divisors` and `image_fst_divisorsAntidiagonal` Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	17/42	Mathlib/NumberTheory/Divisors.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	4-43479 4 days ago	4-46606 4 days ago	4-46599 4 days
39384	EngelsVon author:EngelsVon	feat(Analysis/Calculus/DifferentialForm): Stokes' theorem on rectangular boxes	## Summary This PR proves the generalized Stokes theorem for differential forms on rectangular boxes $[a, b] \subset \mathbb{R}^{m+1}$. The proof strategy is: 1. Extract the `i`-th signed face component `boxFaceComponent ω i` from an `m`-form `ω` — a scalar function whose divergence equals the top-form density of the exterior derivative `dω`. 2. Apply Mathlib's existing divergence theorem for boxes (`integral_divergence_of_hasFDerivAt_off_countable'`). This gives a genuine proved Stokes formula in the Euclidean setting, complementing the existing infrastructure for differential forms. ## Main definitions - `DifferentialForm.topFormDensity`: density function of a top-form field - `DifferentialForm.boxFaceComponent`: the `i`-th signed face component of an `m`-form on `ℝ^(m+1)` - `DifferentialForm.boxBoundaryIntegral`: the signed boundary integral over `∂[a,b]` ## Main results - `box_stokes_of_hasFDerivAt`: Stokes' theorem on boxes with pointwise differentiability hypotheses - `box_stokes_of_contDiff`: a convenient `C¹` formulation	t-analysis new-contributor	314/0	Mathlib.lean,Mathlib/Analysis/Calculus/DifferentialForm/BoxStokes.lean	2	2	['github-actions']	nobody	none	4-39077 4 days ago	4-39186 4 days ago	4-39179 4 days
39383	fpvandoorn author:fpvandoorn	fix: use notation3 more	* `notation3` is better at generating delaborators in the presence of implicit arguments, other notation and some other complications. * I explicitly tested that each change was not correctly pretty-printed before, but now is. * Add spaces around the global notation `^+` (that maybe shouldn't be global at all?) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/21	Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Data/Sum/Order.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	10	1	['github-actions']	nobody	none	4-35754 4 days ago	4-41324 4 days ago	4-41317 4 days
39392	jayscambler author:jayscambler	feat(Cryptography): one-time pad and Shannon perfect secrecy	Adds `Mathlib/Cryptography/OTP.lean`. One-time pad over an arbitrary finite abelian group `G`: - `OTP.encrypt k m := m + k`, `OTP.decrypt k c := c - k`. - `OTP.correct`: `decrypt k (encrypt k m) = m`, by `abel`. - `OTP.perfect_secrecy`: for any `m₀, m₁`, the distributions of `encrypt k m₀` and `encrypt k m₁` over uniform `k` are equal; both reduce to `PMF.uniformOfFintype G`. Proof goes via `Equiv.addLeft`. Independent of the Schnorr PR (#39279); no shared definitions. Unlike everything else likely to live under `Mathlib/Cryptography/`, the security guarantee here is information-theoretic, not computational. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	76/0	Mathlib.lean,Mathlib/Cryptography/OTP.lean	2	3	['MrBrain295', 'github-actions']	nobody	none	4-8339 4 days ago	4-30813 4 days ago	4-30806 4 days
39402	marcelolynch author:marcelolynch	feat(ci): add Lake cache shadow workflow for master	Introduces a scheduled, non-blocking pipeline that exercises Lake's built-in artifact cache against mathlib master, tracking the eventual migration off `lake exe cache` The workflow runs daily on cron and on workflow_dispatch. Jobs: build_and_stage: 1. Hydrates .lake/build/ via legacy `lake exe cache get` 2. patches the lakefile to enable Lake's artifact cache with three knobs 3. runs an incremental `lake build` to populate Lake's cache from existing artifacts 4. uploads cache artifact for next job. upload: Downloads the staging artifact and pushes it to the cache bucket via `lake cache put-staged`. consume: - `lake cache get` from the cache bucket - `lake build` against the rehydrated cache, `--rehash` verify.	CI	406/0	.github/workflows/lake_cache_shadow.yml	1	2	['github-actions', 'marcelolynch']	nobody	none	4-8099 4 days ago	4-11885 4 days ago	4-11878 4 days
37623	IvanRenison author:IvanRenison	feat(Order/RelIso): add theorems about `RelHom.comp` and `RelEmbedding.trans`	Co-authored-by: SnirBroshi <26556598+SnirBroshi@users.noreply.github.com> --- Missing of this theorems noticed by @SnirBroshi in #37598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	18/0	Mathlib/Order/RelIso/Basic.lean	1	8	['IvanRenison', 'SnirBroshi', 'dagurtomas', 'eric-wieser', 'github-actions']	nobody	1	3-69570 3 days ago	43-43040 43 days ago	44-66568 44 days
37745	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/AugmentationIdeal): base change for augmentation ideals	Base change for augmentation ideals Co-authored with: @mariainesdff --- - [x] depends on: #37744 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra large-import label:t-algebra$	441/1	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Projection.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/LinearAlgebra/TensorProduct/Submodule.lean,Mathlib/Order/Disjoint.lean,Mathlib/RingTheory/Ideal/IsAugmentation.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	12	18	['AntoineChambert-Loir', 'dagurtomas', 'github-actions', 'mathlib-dependent-issues']	nobody	none	3-64078 3 days ago	3-64149 3 days ago	4-38118 4 days
39406	roos-j author:roos-j	feat(Analysis): van der Corput's lemma	Adds van der Corput's lemma on one-dimensional oscillatory integrals, a standard tool in harmonic analysis. Co-authored-by: Manasa Praveen --- From https://github.com/roos-j/lean-oscillatory, see there for future plans Zulip discussion [#mathlib4 > Oscillatory integrals in Lean](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Oscillatory.20integrals.20in.20Lean/with/584786060) AI disclosure: The code in this PR was predominantly human-written. gpt-5.5 has helped in the later stages with shortening proofs, golfing and general advice.	t-analysis new-contributor	551/0	Mathlib.lean,Mathlib/Analysis/OscillatoryIntegrals/VanDerCorput.lean	2	2	['github-actions']	nobody	none	3-57649 3 days ago	3-76180 3 days ago	3-77237 3 days
39178	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Measure/PreVariation`	- refactors `Mathlib/MeasureTheory/Measure/PreVariation` by simplifying `sum_le'` and `sum_le_preVariationFun_of_subset` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	6/20	Mathlib/MeasureTheory/Measure/PreVariation.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52197 3 days ago	7-73941 7 days ago	7-73934 7 days
39177	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic`	- refactors `Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic` by shortening `Measure.ext_of_charFunDual` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	1/6	Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52105 3 days ago	7-73943 7 days ago	7-73936 7 days
39175	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Integral/CircleTransform`	- refactors `Mathlib/MeasureTheory/Integral/CircleTransform` by shortening `circleTransformDeriv_periodic` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	1/6	Mathlib/MeasureTheory/Integral/CircleTransform.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52065 3 days ago	7-73948 7 days ago	7-73941 7 days
39174	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Integral/Asymptotics`	- refactors `Mathlib/MeasureTheory/Integral/Asymptotics` by simplifying `IsBigO.set_integral_isBigO` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	6/12	Mathlib/MeasureTheory/Integral/Asymptotics.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52055 3 days ago	7-73951 7 days ago	7-73944 7 days
39173	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/ConvergenceInDistribution`	- refactors `Mathlib/MeasureTheory/Function/ConvergenceInDistribution` by shortening `TendstoInDistribution.prodMk_of_tendstoInMeasure_const` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	2/18	Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52033 3 days ago	7-73953 7 days ago	7-73946 7 days
39172	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic`	- refactors `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic` by simplifying `stronglyMeasurable_in_set` and `stronglyMeasurable_of_measurableSpace_le_on` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	16/42	Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	none	3-52023 3 days ago	7-73955 7 days ago	7-73948 7 days
38362	vihdzp author:vihdzp	feat: cofinal subset of regular cardinal is isomorphic to it	In set theory, one often identifies a cardinal `c` with its initial ordinal `c.ord`, and said ordinal with the lower set `Iio c.ord`. This is particularly pervasive in the theory of club and stationary subsets, where one often sees the hypothesis "let κ be a regular cardinal" in lieu of the more precise wording: that `κ` is an (infinite) well-order, whose order type equals the initial ordinal of its cardinality. We define a typeclass `IsRegularCardinalOrder` for this assumption. The benefit of using it is that our results won't apply only to `Iio c.ord` for regular `c`, but also to concrete types such as `Nat`, `Cardinal`, or `Ordinal`. As a proof of concept, we define `Order.enum`, a generalization of both `Nat.nth` and `Ordinal.enumOrd`. A future PR will deprecate the latter. --- - [x] depends on: #38363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	127/11	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean	5	12	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	3-49968 3 days ago	3-69469 3 days ago	7-28007 7 days
39419	tb65536 author:tb65536	feat(Dynamics/FixedPoints/Support): define the fixed support of a self-map	This PR defines the fixed support of a self-map to be the closure of the complement of the set of fixed points. This notion arises in dynamics. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-dynamics	79/1	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Defs.lean,Mathlib/Dynamics/FixedPoints/Support.lean	4	1	['github-actions']	nobody	none	3-41279 3 days ago	3-41279 3 days ago	3-41273 3 days
39425	Hagb author:Hagb	chore(Order/Preorder/Finite): use `to_dual`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/25	Mathlib/Order/Preorder/Finite.lean	1	1	['github-actions']	nobody	none	3-37686 3 days ago	3-37766 3 days ago	3-37759 3 days
39428	harahu author:harahu	chore: add an empty line after module headers	This makes the docs easier to read. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		122/4	Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/PeanoCurve.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/EuclideanDomain/Int.lean,Mathlib/Algebra/Homology/Opposite.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Archimedean/IndicatorCard.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Normed/Affine/Convex.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/CategoryTheory/DinatTrans.lean,Mathlib/CategoryTheory/Limits/Preserves/Filtered.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/CategoryTheory/Preadditive/Schur.lean,Mathlib/CategoryTheory/Sites/Abelian.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Bundle.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/SProd.lean,Mathlib/Data/Set/Enumerate.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/LinearAlgebra/Multilinear/Curry.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/RootSystem/OfBilinear.lean,Mathlib/LinearAlgebra/RootSystem/RootPairingCat.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/Logic/Lemmas.lean,Mathlib/MeasureTheory/Function/EssSup.lean,Mathlib/MeasureTheory/Group/Prod.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbsoluteValue.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/FLT/Four.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/PID.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Three.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/NumberField/EquivReindex.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/Order/Bounded.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/RepresentationTheory/Rep/Res.lean,Mathlib/RingTheory/AdicCompletion/RingHom.lean,Mathlib/RingTheory/Conductor.lean,Mathlib/RingTheory/Coprime/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	122	1	['github-actions']	nobody	none	3-36971 3 days ago	3-37051 3 days ago	3-37044 3 days
34713	dennj author:dennj	feat(Probability/Markov): stationary distributions for stochastic matrices	This PR proves that every row-stochastic matrix on a finite nonempty state space has a stationary distribution in the standard simplex. Main additions to `Mathlib/Probability/Markov/Stationary.lean`: - `IsStationary`: A distribution μ is stationary for matrix P if μ ᵥ* P = μ - `cesaroAverage`: Cesàro average of iterates of a vector under a matrix - `Matrix.rowStochastic.exists_stationary_distribution`: existence theorem The proof uses Cesàro averaging: start with uniform distribution, form averages, extract convergent subsequence by compactness, show limit is stationary via L¹ non-expansiveness. Also adds `vecMul_mem_stdSimplex` to `Stochastic.lean`: multiplying a probability vector by a row-stochastic matrix preserves simplex membership. This is human-made PR with AI help in golfing proof and documenting the code.	new-contributor t-measure-probability	166/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/Probability/Markov/Stationary.lean	3	17	['EtienneC30', 'dennj', 'dupuisf', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'riccardobrasca']	nobody	none	3-34506 3 days ago	22-20588 22 days ago	32-53594 32 days
39442	justus-springer author:justus-springer	feat(AlgebraicGeometry/Restrict): a few more restriction lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	55/0	Mathlib/AlgebraicGeometry/Restrict.lean	1	1	['github-actions']	nobody	none	3-22434 3 days ago	3-22534 3 days ago	3-22527 3 days
39328	justus-springer author:justus-springer	chore(AlgebraicGeometry): add deprecated module for `RationalMap`	Follow-up to #39316 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry easy	11/0	Mathlib.lean,Mathlib/AlgebraicGeometry/RationalMap.lean	2	1	['github-actions']	nobody	none	3-21062 3 days ago	5-28979 5 days ago	5-28972 5 days
38055	felixpernegger author:felixpernegger	feat(Topology/EMetricSpace): add r-variation	Redoing #37007 (I had accidently deleted my fork which nuked the PR). See https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/p-variation for discussion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-analysis	408/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/RVariation.lean	2	2	['felixpernegger', 'github-actions']	nobody	none	3-13671 3 days ago	32-70648 32 days ago	32-71035 32 days
39452	Deicyde author:Deicyde	chore: Move `UnitAddTorus` to Topology/Instances/AddCircle/Real.lean	Previous location of `UnitAddTorus` in Analysis/Fourier/AddCircleMulti.lean was ad-hoc and required users to import the entire Fourier analysis infrastructure just to use the torus. I suggest moving it to it's natural home beside `UnitAddCircle`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	3/3	Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Topology/Instances/AddCircle/Real.lean	2	3	['github-actions']	nobody	none	3-12364 3 days ago	3-12841 3 days ago	3-12834 3 days
39454	SnirBroshi author:SnirBroshi	feat(Analysis/Convex/Jensen): more forms of Jensen's strict inequality	Adds iff theorems for Jensen's strict inequality for `<`/`=`, positive/nonnegative weights, and canonical form versions. --- Note that as established by existing theorems in the file, "canonical" here refers to comparing terms to the center of mass instead of to each other. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	95/13	Mathlib/Analysis/Convex/Jensen.lean	1	1	['github-actions']	nobody	none	3-11788 3 days ago	3-11866 3 days ago	3-11859 3 days
39438	SnirBroshi author:SnirBroshi	chore(Order/WellFounded): use `to_dual`	Creates `argmax`/`argmaxOn` duals to the existing `argmin`/`argminOn`, and `WellFoundedLT.min`/`WellFoundedGT.max` in order to properly dualize `WellFounded.min_le`. Some theorems about `WellFounded{LT/GT}` which didn't have a dual before have to be renamed to make room, e.g. `StrictMono.range_inj` is renamed to `StrictMono.range_inj_of_wellFoundedLT`. --- This is blocking dualizing things in `ConditionallyCompleteLattice/Basic.lean`. `WellFounded.min_le` has ~30 usages in ~10 files, so deprecating it should probably happen in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	80/34	Mathlib/Data/Finset/Sort.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/WellFounded.lean,Mathlib/SetTheory/Ordinal/Enum.lean	4	5	['SnirBroshi', 'github-actions', 'vihdzp']	nobody	1	3-10745 3 days ago	3-10817 3 days ago	3-19406 3 days
39106	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/Reindex): `AddEquiv` and `RingEquiv`	We had `Matrix.reindex` bundled as a `LinearEquiv` and an `AlgEquiv`, and this bundles it as an `AddEquiv` and a `RingEquiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	158/43	Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean	4	10	['SnirBroshi', 'eric-wieser', 'github-actions', 'themathqueen']	nobody	none	3-10304 3 days ago	6-12991 6 days ago	6-35186 6 days

Needs triage: assigned PRs on the review queue

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
35402	samueloettl author:samueloettl	feat(Dynamics/BirkhoffSum): birkhoffAverage const	--- I think this is useful and one of these should be a simp lemma. I'm not really sure if I got the naming of the theorems correct. When generalizing to the assumption (n : R) ≠ 0 instead of the special case CharZero R with n ≠ 0 I had to use "open Classical in". I'm a bit unfamiliar with that part so please check if this makes sense. See also https://github.com/leanprover-community/mathlib4/pull/35307#discussion_r2823586252 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor	22/0	Mathlib/Dynamics/BirkhoffSum/Average.lean	1	26	['Maldooor', 'github-actions', 'lua-vr', 'mcdoll', 'samueloettl']	mcdoll assignee:mcdoll	none	82-13656 2 months ago	19-53018 19 days ago	85-51523 85 days
35610	IvanRenison author:IvanRenison	feat(Data/Fin): add several lemmas about subtraction of `Fin.{castLT, castAdd, castSucc, castPred}`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	79/0	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean	2	13	['IvanRenison', 'chrisflav', 'github-actions', 'robin-carlier', 'wwylele']	eric-wieser assignee:eric-wieser	none	80-13674 2 months ago	17-23700 17 days ago	82-54708 82 days
33714	idontgetoutmuch author:idontgetoutmuch	feat(Mathlib/Geometry/Manifold): Riemannian metrics exist II	Supersedes https://github.com/leanprover-community/mathlib4/pull/33519 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor	680/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	3	200	['Rida-Hamadani', 'github-actions', 'grunweg', 'idontgetoutmuch']	fpvandoorn assignee:fpvandoorn	none	78-46105 2 months ago	29-53218 29 days ago	74-59970 74 days
28685	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the minimal-degree version of the Erdős-Stone theorem	Proves the minimal degree-version of the Erdős-Stone theorem: If `G` has a minimal degree of at least `(1 - 1 / r + o(1)) * card V`, then `G` contains a copy of a `completeEquipartiteGraph` in `r + 1` parts each of size `t`. The double-counting construction from the proof is available in `namespace ErdosStone`. --- - [x] depends on: #25843 - [x] depends on: #27597 - [x] depends on: #27599 - [x] depends on: #28443 - [x] depends on: #28445 - [x] depends on: #28446 - [x] depends on: #28447 This is the first of several pull requests towards the full Erdős-Stone(-Simonovits) theorem, hence the name of the file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	323/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	2	19	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'robin-carlier']	b-mehta assignee:b-mehta	1	77-79545 2 months ago	15-13807 15 days ago	75-22542 75 days
35069	A-M-Berns author:A-M-Berns	feat(Geometry/Polygon): simple polygons and boundary map	This PR introduces Simple polygons with the predicate `IsSimple`, which captures the idea of a non-self-intersecting boundary, in the file Simple.lean. In the file Boundary.lean, a boundary map from `AddCircle n` is defined. I prove that the range of this map is the boundary and that this map is injective if and only if the polygon is simple. I kept Boundary.lean and Simple.lean separate because future results will include stuff just about the boundary map independent of simplicity (e.g. that it is continuous in the appropriate setting) and stuff just about simple polygons independent of the boundary map (e.g. that for n = 3, IsSimple iff HasNondegenerateVertices.) I used Claude Code to help generate some of the proof material, but I golfed and edited all AI contribution. - [x] depends on: #34598 ---	new-contributor t-euclidean-geometry LLM-generated	360/0	Mathlib.lean,Mathlib/Geometry/Polygon/Boundary.lean,Mathlib/Geometry/Polygon/Simple.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean	4	30	['A-M-Berns', 'eric-wieser', 'github-actions', 'joneugster', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele']	eric-wieser assignee:eric-wieser	none	71-1778 2 months ago	82-39524 82 days ago	84-73803 84 days
36219	gasparattila author:gasparattila	chore(Order/SupClosed): use `to_dual`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	86/217	Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/SupClosed.lean	6	6	['github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	none	69-61482 2 months ago	33-41803 33 days ago	37-46007 37 days
34045	smmercuri author:smmercuri	feat: `algebraMap K L` is uniform continuous with respect to adic topologies, when the ideal `w` of `L` lies above `v`	- `A` is a Dedekind domain with field of fractions `K`. - `B` is a Dedekind domain with field of fractions `L`. - `L` is a field extension of `K`. - `v` is a height one prime ideal of `A`. - `w` is a height one prime ideal of `B` lying over `v`. Then respective valuations are related via the ramification index, and `algebraMap (WithVal (v.valuation K)) (WithVal (w.valuation L))` is uniform continuous. --- - [x] depends on: #34049 - [x] depends on: #35972 - [x] depends on: #36144 - [x] depends on: #36310 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-algebra t-number-theory label:t-algebra$	164/4	Mathlib.lean,Mathlib/Algebra/Order/Hom/Units.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	10	['dagurtomas', 'github-actions', 'jjdishere', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	alreadydone assignee:alreadydone	none	66-71436 2 months ago	21-53618 21 days ago	39-48151 39 days
37939	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Order/Completion): embed a linear order into a dense and complete linear order	The aim of the PR is to prove the following theorem that will be used as an input to [Sion.DMCompletion.exists_isSaddlePointOn](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sion.html#Sion.DMCompletion.exists_isSaddlePointOn) : If `β` is any linear order, then there exists a complete and dense linear order `γ` together with a continuous embedding `ι : β ↪o γ` (for the order topologies on `β` and `γ`). Meanwhile, the PR also records various instances about dense orders and lemmas regarding the Dedekind MacNeille completion and lexicographic orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	206/3	Mathlib.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Order/Completion.lean,Mathlib/Topology/Order/Completion.lean,Mathlib/Topology/Sion.lean	5	52	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	vihdzp assignee:vihdzp	1	26-25791 26 days ago	26-46522 26 days ago	29-46214 29 days
36709	kim-em author:kim-em	feat(DefEqAbuse): suggest minimal @[implicit_reducible] workaround	This PR extends `#defeq_abuse` to suggest a minimal set of `@[implicit_reducible]` annotations that would make the failing tactic or command succeed with `backward.isDefEq.respectTransparency true`. When `#defeq_abuse` detects a failure, it now runs a greedy minimisation over semireducible definitions reachable from the goal/command, finding a (possibly non-unique) minimal subset that, when temporarily marked `@[implicit_reducible]`, fixes the issue. The result is reported as an `info` message: ``` info: Workaround: the following @[implicit_reducible] annotations (a possibly non-unique minimal set) would paper over this problem, but the real issue is likely a leaky instance somewhere. set_option allowUnsafeReducibility true attribute [implicit_reducible] MyPred ``` This is a workaround, not a fix — the real cause is usually a leaky instance (which `#check_instance` from https://github.com/leanprover-community/mathlib4/pull/36706 can diagnose). But it can be useful for quick debugging. New helpers: `collectCandidates`, `markImplicitReducible`, `withTempImplicitReducible`, `withTempImplicitReducibleCmd`, `suggestAnnotationsTac`, `suggestAnnotationsCmd`, `formatAnnotations`, `logAnnotationSuggestions`. 🤖 Prepared with Claude Code	t-meta LLM-generated	187/17	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	6	['github-actions', 'kim-em', 'mathlib-merge-conflicts', 'thorimur']	dwrensha and thorimur assignee:dwrensha assignee:thorimur	none	20-64462 20 days ago	20-64507 20 days ago	37-62711 37 days
37501	xgenereux author:xgenereux	feat(DedekindDomain/AdicValuation): `intValuation` on uniformizers is `exp (-1)`	This PR add the lemma `intValuation_val_uniformizer_eq` which is an application of #37497. Note that I've had to reorganize the files a little bit: 1. I wanted to import `Valuation.Discrete.Basic` in `AdicValuation` but this was not possible since there was a dependency in the other direction (`Valuation.Discrete.Basic` depended on `AdicValuation`). I don't think this makes sense - we want to have access to basic definitions on general valuation in an application file like `AdicValuation`. ~~The reorganization consist of moving the `IsDiscreteValuationRing` of `Valuation.Discrete.Basic` to `AdicValuation`.~~ The reorganization consist of moving the `IsDiscreteValuationRing` section to a new file. 2. I moved some lemmas out of `Mathlib.RingTheory.Valuation.Discrete.RankOne` to the parent file `Mathlib.RingTheory.Valuation.Discrete.Basic.`. These lemmas do not need the richer imports from `RankOne` and are needed in my application. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #37497 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	203/167	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Reduction.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/OrderOfVanishing/Noetherian.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/IsDiscreteValuationRing.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean	8	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	mattrobball assignee:mattrobball	none	20-12743 20 days ago	30-76293 30 days ago	38-68143 38 days
37747	JovanGerb author:JovanGerb	chore(Order/Filter/AtTopBot/Basic): use `to_dual`	This PR uses `to_dual` for `atTop`/`atBot`. A lot of theorems that have been tagged contain the expression `∀ a ≥ b, ...`, which means that their dual will be `∀ a, b ≥ a → ...`, which is obviourly undesirable. Hence, I would like to ask the reviewers to reconsider the possibility of merging #32985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	56/164	Mathlib/Order/Filter/AtTopBot/Basic.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	none	20-12742 20 days ago	41-51833 41 days ago	41-51826 41 days
37752	JovanGerb author:JovanGerb	chore(Order/CompleteLattice/Lemmas): use `to_dual`	Use `to_dual` for lemmas about `CompleteLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	27/56	Mathlib/Order/CompleteLattice/Lemmas.lean	1	1	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	1	20-12741 20 days ago	41-50509 41 days ago	41-50502 41 days
37753	JovanGerb author:JovanGerb	chore(Order/Filter/Basic): use `to_dual` for `≤ᶠ`	Use `to_dual` on lemmas about `EventuallyLE`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	19/6	Mathlib/Order/Filter/Basic.lean	1	2	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	1	20-12740 20 days ago	41-50374 41 days ago	41-50367 41 days
37389	martinwintermath author:martinwintermath	chore(LinearAlgebra/SesquilinearForm): generalize `orthogonalBilin` in order to simplify definition of `orthogonal`	- generalize `Submodule.orthogonalBilin` to `CommSemiring` and `AddCommMonoid`, and to general sesquilinear forms with inputs from different modules. This enables subsequent changes. - redefine `BilinForm.orthogonal` in terms of `orthogonalBilin`. - reorder arguments of `Submodule.orthogonalBilin` to match other instances of duality across mathlib. For comparison Before ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_5, u_6} {R : Type u_1} {R₁ : Type u_2} {M : Type u_5} {M₁ : Type u_6} [CommRing R] [CommRing R₁] [AddCommGroup M₁] [Module R₁ M₁] [AddCommGroup M] [Module R M] {I₁ I₂ : R₁ →+* R} (N : Submodule R₁ M₁) (B : M₁ →ₛₗ[I₁] M₁ →ₛₗ[I₂] M) : Submodule R₁ M₁ ``` After ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_3, u_5, u_6, u_7} {R : Type u_1} {R₁ : Type u_2} {R₂ : Type u_3} {M : Type u_5} {M₁ : Type u_6} {M₂ : Type u_7} [CommSemiring R] [CommSemiring R₁] [CommSemiring R₂] [AddCommMonoid M] [Module R M] [AddCommMonoid M₁] [Module R₁ M₁] [AddCommMonoid M₂] [Module R₂ M₂] {I₁ : R₁ →+* R} {I₂ : R₂ →+* R} (B : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M) (N : Submodule R₁ M₁) : Submodule R₂ M₂ ``` A few fixes in other files have been necessary as well. This is an extract from #37381. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	28/21	Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	5	8	['eric-wieser', 'github-actions', 'martinwintermath', 'themathqueen', 'vihdzp']	ocfnash assignee:ocfnash	1	19-57029 19 days ago	19-56937 19 days ago	49-25739 49 days
36667	NoneMore author:NoneMore	feat(ModelTheory): add `exClosure` definition for first-order formulas	Prepare for moving realizations between elementarily equivalent structures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	37/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	2	['github-actions']	fpvandoorn assignee:fpvandoorn	none	19-12802 19 days ago	64-84287 64 days ago	64-84280 64 days
37682	SabrinaJewson author:SabrinaJewson	refactor(Order/OrdContinuous): redefine left and right order continuity to not require preserving ⊥/⊤	`LeftOrdContinuous` currently requires that `f ⊥ = ⊥`, but this means that many functions that are perhaps intuitively left-continuous (like `f x = x + 1` on `ℝ≥0`) are not. In particular, this change means that functions between conditionally complete lattices are `LeftOrdContinuous` iff they are monotone and topologically left continuous (see `MonotoneOn.map_csSup_of_continuousWithinAt` for the reverse direction). If one wants the concept that existed before, one can either accept the `f ⊥ = ⊥` hypothesis separately or, if the function is between complete lattices, use the left side of a `GaloisConnection` (which is equivalent, although I think this is not yet in Mathlib). This removes the definitional equality of the type in favour of a structure. Since most of the time users will be working with the `sSup` versions and not with `IsLUB`, I think this is justified. As a consequence, this removes the definitional equality between `LeftOrdContinuous` and `RightOrdContinuous` of the dual – the latter could be redefined to re-add this, but we do have conversion functions. `LeftOrdContinuous.continuousWithinAt_Iic` is rewritten to accomodate these changes; the superfluous `DenselyOrdered` assumption is also removed. [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/LeftOrdContinuous.20requires.20f.28.E2.8A.A5.29.20.3D.20.E2.8A.A5/near/582932491) --- - [x] depends on: #37735 - [x] depends on: #37772 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	52/38	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	10	['SabrinaJewson', 'astrainfinita', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	bryangingechen assignee:bryangingechen	none	19-12796 19 days ago	39-21694 39 days ago	41-18796 41 days
38169	tb65536 author:tb65536	chore(GroupTheory/Finiteness): make `Subgroup.FG` a class	This PR refactors `Subgroup.FG` to be a class to match `Group.FG`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	37/20	Mathlib/GroupTheory/Commutator/Finite.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/Rank.lean,Mathlib/GroupTheory/Schreier.lean	4	10	['JovanGerb', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	none	17-37099 17 days ago	17-51167 17 days ago	31-39319 31 days
37784	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Basic): `ConditionallyCompleteLinearOrderBot (WithBot α)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	29/0	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	none	17-12964 17 days ago	41-9334 41 days ago	41-9327 41 days
38018	matthewjasper author:matthewjasper	feat(Algebra): expand Subalgebra.restrictScalars API	Add an instance for the original algebra structure, the implied scalar tower instances, and the algebra equivalence with the original subalgebra. Use this to remove some `set_option backward.isDefEq.respectTransparency`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	53/14	Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean	4	2	['eric-wieser', 'github-actions']	mariainesdff assignee:mariainesdff	none	16-12622 16 days ago	35-25562 35 days ago	35-27172 35 days
38634	Maldooor author:Maldooor	feat(MeasureTheory): `restrict_absolutelyContinuous_restrict`	Adding three lemmas about absolute continuity of restrictions of measures to subsets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	19/0	Mathlib/MeasureTheory/Measure/Restrict.lean	1	4	['EtienneC30', 'Maldooor', 'github-actions']	EtienneC30 assignee:EtienneC30	none	15-67153 15 days ago	15-67153 15 days ago	18-11937 18 days
37179	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemmas about left and right elements of `SimpleGraph.sum`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	18/0	Mathlib/Combinatorics/SimpleGraph/Sum.lean	1	3	['WilliamCoram', 'github-actions']	b-mehta assignee:b-mehta	none	15-12753 15 days ago	54-28563 54 days ago	54-28556 54 days
38872	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable`	- replaces the `aeSeq`-based construction in `measurable_limit_of_tendsto_metrizable_ae` with a direct choice of the pointwise limit - proves a.e. measurability via `aemeasurable_of_tendsto_metrizable_ae` and then takes the measurable representative Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	11/19	Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	none	15-12744 15 days ago	15-57432 15 days ago	15-57425 15 days
38875	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Covering/Besicovitch`	- shortens the proof of `r_t0` in `exists_closedBall_covering_tsum_measure_le` by turning the contradiction argument into a direct lambda - replaces the manual `simp only` proof with `mem_iUnion₂` and a final `simp [r, this]` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	3/8	Mathlib/MeasureTheory/Covering/Besicovitch.lean	1	2	['github-actions', 'yuanyi-350']	RemyDegenne assignee:RemyDegenne	none	15-12741 15 days ago	15-56275 15 days ago	15-56268 15 days
38876	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable`	- rewrites `memLp_trim_of_mem_lpMeasSubgroup` to use `hf.mk f` instead of unpacking `hf.choose` - shortens the norm comparison to a direct rewrite with `eLpNorm_trim` and `hf.ae_eq_mk` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	3/8	Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	none	15-12740 15 days ago	15-55940 15 days ago	15-55933 15 days
38881	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic`	- shortens `stronglyMeasurable_in_set` by inlining the restricted approximation sequence and folding the `hg_eq` / `hg_zero` helper lemmas into the two `by_cases` branches Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	7/13	Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	none	15-12737 15 days ago	15-53883 15 days ago	15-53876 15 days
38882	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/AEMeasurableOrder`	- replaces the manual `μ t = 0` to `ae` conversion with `measure_eq_zero_iff_ae_notMem` - rewrites the two density arguments in `aemeasurable_of_exist_almost_disjoint_supersets` using `s_dense.exists_between` and `mem_iUnion₂` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	7/18	Mathlib/MeasureTheory/Function/AEMeasurableOrder.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	none	15-12736 15 days ago	15-53664 15 days ago	15-53657 15 days
38127	riccardobrasca author:riccardobrasca	feat: add ClassGroup.extendedHom	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra t-ring-theory label:t-algebra$	110/6	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/RingTheory/ClassGroup/Basic.lean,Mathlib/RingTheory/ClassGroup/ExtendedHom.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/UniqueFactorizationDomain/ClassGroup.lean	9	17	['faenuccio', 'github-actions', 'mathlib-merge-conflicts', 'riccardobrasca']	mattrobball assignee:mattrobball	none	14-54189 14 days ago	18-69625 18 days ago	32-3572 32 days
37295	wwylele author:wwylele	feat(Analysis/InnerProductSpace): generalized determinant of a rectangle matrix / linear map	This is the volume factor of a linear map --- I have encountered the expression `sqrt(det(T' * T))` a few times in various places but it doesn't look like it has a standard name and entry in mathlib, so this adds it. Zulip thread [#Is there code for X? > (norm of) "determinant" of map between inner product spaces](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.28norm.20of.29.20.22determinant.22.20of.20map.20between.20inner.20product.20spaces/with/581776873) One motivation to define this is to state volume formula under transformations. From Measure theory and fine properties of functions: - Lemma 3.1: for linear map $L : \mathbb{R}^n \to \mathbb{R}^m$, we have $\mathcal{H}^n(L(A)) = [ L ] \mathcal{L}^n(A)$. This is proved in this PR at `euclideanHausdorffMeasure_image_eq_normDet_mul_volume` - Theorem 3.8, for (not necessarily linear) $f : \mathbb{R}^n \to \mathbb{R}^m$ ($n \le m$) and $\mathcal{L}^n$-measurable set $A \subset \mathbb{R}^n$, we have $\int_A J f dx = \int_{\mathbb{R}^m} \mathcal{H}^0(A \cap f\^{-1}\{y\}) d\mathcal{H}^n(y)$, where $J f$ is the `normDet` of the rectangular Jacobian matrix AI usage disclosure: AI was used in the following parts - searching for related literature for an appropriate name - generate draft proofs for some lemma to verify their correctness, though the final code has been completely rewritten by me. - [ ] depends on: #37918 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	480/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/NormDet.lean,docs/references.bib	4	18	['copilot-pull-request-reviewer', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'themathqueen', 'wwylele']	j-loreaux assignee:j-loreaux	none	14-35808 14 days ago	14-35546 14 days ago	48-23701 48 days
38002	Raph-DG author:Raph-DG	feat(Topology): Relating irreducible components of a space to codimension one points in non dense subsets	In this PR we show that the coheight zero points of a sober space (in the specialization order) correspond to the irreducible components. Furthermore, we show that the coheight one points of any non dense subset p of X (in the specialization order on p) have coheight zero in the specialization order on X. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	103/0	Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Minimal.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Sober.lean	5	3	['ADedecker', 'github-actions', 'mathlib-merge-conflicts']	urkud assignee:urkud	none	14-35217 14 days ago	14-35254 14 days ago	31-14520 31 days
32294	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): distance from second intersection with circumcircle	Add the following lemma: given a triangle ABC, suppose an angle bisector from A through the incenter or excenter I meets the circumcircle again at X (including the case of an external bisector at A tangent to the circle, in which case X = A). Then XB = XI (= XC, by applying this lemma again). This is a standard configuration: https://en.wikipedia.org/wiki/Incenter%E2%80%93excenter_lemma --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32023 - [ ] depends on: #32270 - [ ] depends on: #32290 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	189/0	Mathlib/Geometry/Euclidean/Angle/Incenter.lean	1	5	['github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'peakpoint']	eric-wieser assignee:eric-wieser	none	14-12971 14 days ago	52-37625 52 days ago	52-38408 52 days
37984	loefflerd author:loefflerd	feat: abstract theory of measures	General foundations of non-archimedean measure theory (intended for applications to Iwasawa algebras) --- - [x] depends on: #38701	t-topology	458/0	Mathlib.lean,Mathlib/NumberTheory/Padics/Measure/Basic.lean,Mathlib/NumberTheory/Padics/Measure/Group.lean,Mathlib/NumberTheory/Padics/Measure/Topology.lean	4	2	['github-actions', 'mathlib-dependent-issues']	PatrickMassot assignee:PatrickMassot	none	14-12965 14 days ago	14-27355 14 days ago	14-28076 14 days
38049	WilliamCoram author:WilliamCoram	feat: lemmas towards showing gaussNorm on MvPowerSeries is an absolute value	We prove lemmas: ``gaussNorm_mul_le`` and ``gaussNorm_le_mul`` which will allow us to show it is an absolute value on Mv restricted power series. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	144/1	Mathlib/RingTheory/MvPowerSeries/GaussNorm.lean	1	4	['WilliamCoram', 'github-actions']	alreadydone assignee:alreadydone	none	14-12964 14 days ago	34-42309 34 days ago	34-42302 34 days
38098	astrainfinita author:astrainfinita	chore: make `SMul.comp.smul` `implicit_reducible`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	2/1	Mathlib/Algebra/Group/Action/Defs.lean	1	3	['astrainfinita', 'github-actions', 'leanprover-radar']	themathqueen assignee:themathqueen	none	14-12963 14 days ago	33-3422 33 days ago	33-3415 33 days
38880	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/LpSpace/Complete`	- shortens `ae_tendsto_of_cauchy_eLpNorm'` by rewriting the telescoping partial sums in `hx.hasSum.tendsto_sum_nat` directly and concluding with `add_const`, instead of introducing an intermediate eventual `∃ l` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	4/20	Mathlib/MeasureTheory/Function/LpSpace/Complete.lean	1	2	['Parcly-Taxel', 'github-actions', 'yuanyi-350']	kex-y assignee:kex-y	1	14-12958 14 days ago	15-54157 15 days ago	15-54150 15 days
38883	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/AEMeasurableSequence`	- rewrites `iSup` by filtering directly along `aeSeq_eq_fun_ae hf hp`, instead of proving a subset statement about `aeSeqSet` and then using `measure_mono_null` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	2/6	Mathlib/MeasureTheory/Function/AEMeasurableSequence.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	none	14-12957 14 days ago	15-53445 15 days ago	15-53438 15 days

PRs with just failing CI, but only often-spurious jobs

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
28803	astrainfinita author:astrainfinita	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. This PR continues the work from #23961. - Change `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` so they no longer carry algebraic data. - Deprecate `ESeminormed(Add)CommMonoid` and `ENormed(Add)CommMonoid` in favor of `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` with a commutative algebraic typeclass. \|Old\|New\| \|---\|---\| \| `[ESeminormed(Add)(Comm)Monoid E]` \| `[(Add)(Comm)Monoid E] [ESeminormed(Add)Monoid E]` \| \| `[ENormed(Add)(Comm)Monoid]` \| `[(Add)(Comm)Monoid E] [ENormed(Add)Monoid]` \| See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2328803.20refactor.3A.20unbundle.20algebra.20from.20.60ENormed*.60/with/536024350) ------------ - [x] depends on: #28813	t-algebra merge-conflict slow-typeclass-synthesis awaiting-zulip t-analysis label:t-algebra$	80/63	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	14	28	['astrainfinita', 'bryangingechen', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	grunweg assignee:grunweg	258-17562 8 months ago	266-55116 266 days ago	0-20585 5 hours
34875	banrovegrie author:banrovegrie	feat(LinearAlgebra/Matrix): add Sherman-Morrison formula	Mathlib has the matrix determinant lemma (`det_add_replicateCol_mul_replicateRow` in SchurComplement.lean) but lacked the corresponding inverse formula. This PR fills that gap. - Add `Matrix.inv_add_vecMulVec`: Sherman-Morrison formula for `(A + uv^T)^{-1}` - Add `Matrix.inv_sub_vecMulVec`: subtraction variant - Add `Matrix.isUnit_det_add_vecMulVec`: invertibility under the formula's hypotheses ## Test plan - [x] `lake build` passes - [x] Lines within 100 char limit - [x] All declarations have docstrings Any specific AI usage?: Used Copilot for review purposes.	t-algebra new-contributor awaiting-author label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	14	['Xxxjdjdid', 'banrovegrie', 'chrisflav', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	chrisflav assignee:chrisflav	78-44551 2 months ago	33-41640 33 days ago	69-6728 69 days
30451	kckennylau author:kckennylau	feat(HomogeneousIdeal): generalize to homogeneous submodule	Continuation of #30437 with permission from @jjaassoonn, which is a continuation of #9820 . The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to homogeneous submodules. Let `R` be a graded ring and `M` be a graded `R`-module. Say an `R`-submodule `N` of `M` is homogeneous if for every `x` in `N`, each projection of `x` to `M_i` is in `N`. None of this file's results depends on the grading on `R`, but we include the grading on `R` for technical reasons. We define the "homogeneous core" of a not necessarily homogeneous submodule N to be the biggest homogeneous submodule contained within N, and the "homogeneous hull" to be the smallest homogeneous submodule that contains N. All definitions/constructions/theorems are then copied for ideals/homogeneous ideals. The motivation of this generalization is graded quotient module. (#18716) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author merge-conflict	581/185	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean	10	23	['github-actions', 'mariainesdff', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	68-50070 2 months ago	68-50070 68 days ago	22-61538 22 days
33466	Shreyas4991 author:Shreyas4991	refactor(Combinatorics/Digraph): add vertex sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict please-adopt	382/55	Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Digraph/Orientation.lean	2	83	['IvanRenison', 'Shreyas4991', 'SnirBroshi', 'YaelDillies', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp', 'vlad902']	awainverse assignee:awainverse	66-81779 2 months ago	66-81779 66 days ago	27-54087 27 days
37556	edwin1729 author:edwin1729	feat(Topology/Order): Locale.localePointOfSpacePoint if we have a Scott Topology from an Algebraic DCPO	(3/4) in a series of PRs proving that "Scott Topologies over Algebraic DCPOs are Sober" We prove here that the unit of the adjunction from `TopCat` to `Locale` defined in `Topology/Order/Category/FrameAdjunction.lean` is a surjective mapping, under the following condition: The underlying TopologicalSpace must be a Scott Topology generated with an underlying Algebraic DCPO structure. - [ ] depends on: #37445 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor blocked-by-other-PR merge-conflict	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18767 21 days ago	46-43267 46 days ago	0-1300 21 minutes
37753	JovanGerb author:JovanGerb	chore(Order/Filter/Basic): use `to_dual` for `≤ᶠ`	Use `to_dual` on lemmas about `EventuallyLE`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	19/6	Mathlib/Order/Filter/Basic.lean	1	2	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	20-12740 20 days ago	41-50374 41 days ago	41-50367 41 days
38169	tb65536 author:tb65536	chore(GroupTheory/Finiteness): make `Subgroup.FG` a class	This PR refactors `Subgroup.FG` to be a class to match `Group.FG`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	37/20	Mathlib/GroupTheory/Commutator/Finite.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/Rank.lean,Mathlib/GroupTheory/Schreier.lean	4	10	['JovanGerb', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	17-37099 17 days ago	17-51167 17 days ago	31-39319 31 days
36896	PieterCuijpers author:PieterCuijpers	feat (Algebra/Order/Quantale): isMulLeftsided, isMulRightsided, isMulTwosided and strict versions	* Adding definitions of quantale elements being leftsided, rightsided, and twosided, and strict versions Should we include these definitions in the main Algebra/Order/Quantale.lean file, or start a separate file for them? I have a few basic theorems I would like to include on these notions, but invite suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	81/1	Mathlib/Algebra/Order/Quantale.lean	1	5	['NoahW314', 'PieterCuijpers', 'chrisflav', 'github-actions']	mariainesdff assignee:mariainesdff	13-55260 13 days ago	20-47515 20 days ago	39-18222 39 days
39041	themathqueen author:themathqueen	refactor(Analysis/InnerProductSpace/Projection): redefine `orthogonalProjectionOnto` via `projectionOntoL`	Now that we have `IsTopCompl` and `projectionOntoL`, we can define `orthogonalProjectionOnto` directly this way instead of needing an implementation definition. --- - [ ] depends on: #38970 Zulip thread: [#mathlib4 > refactoring `Submodule.orthogonalProjection`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/refactoring.20.60Submodule.2EorthogonalProjection.60/with/593516136) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-analysis	339/288	Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Projection/Reflection.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/Topology/MetricSpace/HausdorffDimension.lean,docs/overview.yaml,docs/undergrad.yaml	22	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-65935 10 days ago	11-42914 11 days ago	0-1 1 second
39108	idontgetoutmuch author:idontgetoutmuch	feat(Geometry/Manifold/GroupLieAlgebra): Add mfderiv_mul_left_mul and left-translate for integral curves	Add the following: `mfderiv_mul_left_mul`: the derivative of left-multiplication satisfies a chain rule: $$d(L_{g \cdot h})_x = d(L_g)_{h \cdot x} \circ d(L_h)_x$$ `mulInvariantVectorField_mul`: the vector field at the translated point is the push forward of the vector field: $$V(g \cdot h) = d(L_g)_h(V(h))$$ `IsMIntegralCurve.left_translate`: using these, if $\gamma$ is an integral curve of $V$, then so is $t \mapsto g \bullet \gamma(t)$ for any $g \in G$, since: $$\frac{d}{dt}(g \bullet \gamma(t)) = d(L_g)_{\gamma(t)}\left(\frac{d\gamma}{dt}(t)\right) = d(L_g)_{\gamma(t)}(V(\gamma(t))) = V(g \bullet \gamma(t))$$ I argue () all the time with LLMs so this PR will certainly have had some input from them. Is that enough of a disclosure? () Like Lewis Carroll: In my youth said the sage I took to the law and argued each case with wife And the muscular strength that it gave to my jaw has lasted the rest of my life	t-differential-geometry new-contributor awaiting-author LLM-generated	73/0	Mathlib/Geometry/Manifold/GroupLieAlgebra.lean	1	8	['github-actions', 'grunweg']	nobody	9-38982 9 days ago	9-39047 9 days ago	0-37992 10 hours
38649	chrisflav author:chrisflav	chore(RingTheory): equality of linear map with values in finite module spreads out	We add some corollaries of `Module.Finite.exists_smul_of_comp_eq_of_isLocalizedModule`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	75/1	Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Module.lean	3	2	['github-actions']	alreadydone assignee:alreadydone	8-12396 8 days ago	20-51545 20 days ago	20-51538 20 days
29764	ScottCarnahan author:ScottCarnahan	feat(Algebra/Vertex): API up to residue products (WIP)	This PR contains definitions leading up to the residue product of vertex operators and some basic properties. Parts will be split off as smaller PRs when I have time. --- - [ ] depends on: #25831 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import merge-conflict label:t-algebra$	1692/19	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/RestrictedValue.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean	15	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-77215 7 days ago	242-50461 242 days ago	0-12586 3 hours
39347	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): refactor of Pattern and shift-invariance of shape languages for subshifts	## Summary This PR refactors Pattern.mulShift in Mathlib/Dynamics/SymbolicDynamics/Basic.lean and uses the cleaner definition to prove shift-invariance of the language of a subshift on a finite shape. ## Changes Pattern.mulShift now returns a Pattern instead of a configuration (more natural). - Old type: Pattern.mulShift : Pattern A G → G → (G → A) - New type: Pattern.mulShift : Pattern A G → G → Pattern A G - The result carries its support (p.support.image (v * ·)) and the default-outside-support proof, so callers don't have to re-derive them. The [IsLeftCancelMul G] hypothesis is moved to the lemmas that actually use it. - The definition Pattern.mulShift itself no longer needs left-cancellation (it only chooses a preimage noncomputably). - The hypothesis is now stated on mulShift_config_apply_mul_left_of_mem and mulOccursInAt_eq_cylinder directly, instead of being a section-level variable. Renames following the type change. - mulShift_apply_mul_left_of_mem → mulShift_config_apply_mul_left_of_mem (because we now write (p.mulShift v).config instead of p.mulShift v). New @[simp] and @[ext] lemmas for Pattern. - Pattern.ext: two patterns are equal iff their supports agree and their configurations agree on the support. - Pattern.mulShift_support: the support of p.mulShift v is p.support.image (v * ·). - Pattern.fromConfig_support: the support of fromConfig x U is U. - Pattern.fromConfig_config_of_mem: on its support, fromConfig x U agrees with x. New lemma Pattern.fromConfig_mulShift. For a left inverse g' * g = 1, shifting the pattern fromConfig x U by g equals fromConfig (mulShift g' x) (U.image (g * ·)). New theorem MulSubshift.languageOn_image_mulShift. For a subshift Y and elements g, g' with g * g' = 1 and g' * g = 1: (fun p => p.mulShift g) '' Y.languageOn U = Y.languageOn (U.image (g * ·)) i.e. the language on the translated shape is exactly the image of the language on U under the pattern-shift map. This gives a bijection between Y.languageOn U and Y.languageOn (U.image (g * ·)), with inverse p ↦ p.mulShift g'. Stated for left-cancellative monoids with an invertible element. Updated docstrings for Pattern.mulShift and the renamed lemma to reflect the bundled-Pattern return type and clarify which results need [IsLeftCancelMul G].	t-dynamics new-contributor	142/48	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	3	['github-actions']	nobody	5-7210 5 days ago	5-7371 5 days ago	5-7364 5 days
38376	smmercuri author:smmercuri	refactor(Algebra): semialgebra maps	--- - [x] depends on: #38715 - [ ] depends on: #38964 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	773/585	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Notation.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SplittingField/IsSplittingField.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/Adjoin/Field.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Derivation/ToSquareZero.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Etale/StandardEtale.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/Norm/Transitivity.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/Unramified/Pi.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/Module/Spaces/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,MathlibTest/GalNotation.lean	66	11	['github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	nobody	4-52992 4 days ago	26-46742 26 days ago	0-8 8 seconds
39452	Deicyde author:Deicyde	chore: Move `UnitAddTorus` to Topology/Instances/AddCircle/Real.lean	Previous location of `UnitAddTorus` in Analysis/Fourier/AddCircleMulti.lean was ad-hoc and required users to import the entire Fourier analysis infrastructure just to use the torus. I suggest moving it to it's natural home beside `UnitAddCircle`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	3/3	Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Topology/Instances/AddCircle/Real.lean	2	3	['github-actions']	nobody	3-12364 3 days ago	3-12841 3 days ago	3-12834 3 days
39388	marcelolynch author:marcelolynch	chore: remove @[expose] from def-free public sections	Strip `@[expose]` from `public section` headers in 100 modules where no declaration needs its body visible downstream. A new sweep in the style of #38480 Found using the linter-in-progress: #39387 Relevant Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Removing.20unnecessary.20.60.40.5Bexpose.5D.60/with/595180230		100/100	Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Opposite.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Field/ULift.lean,Mathlib/Algebra/Field/ZMod.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/Projective.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Action/End.lean,Mathlib/Algebra/Order/Group/End.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Ring/Commute.lean,Mathlib/AlgebraicTopology/ModelCategory/Over.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Operator/Compact/FiniteDimension.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfLocalizedEquivalences.lean,Mathlib/CategoryTheory/MarkovCategory/Positive.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Normal.lean,Mathlib/CategoryTheory/Monoidal/Functor/Types.lean,Mathlib/CategoryTheory/Monoidal/Types/Coyoneda.lean,Mathlib/CategoryTheory/Sites/CoversTop/Over.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/FunLike/Embedding.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Data/Int/Cast/Pi.lean,Mathlib/Data/List/Monad.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Cast/OfScientific.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/GroupTheory/GroupAction/Embedding.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/ResiduallyFinite.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Star.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/Typeclasses/ZeroOne.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Transform.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/Padics/PadicVal/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Set/OrdConnected.lean,Mathlib/Order/Quotient.lean,Mathlib/Probability/Kernel/Deterministic.lean,Mathlib/RingTheory/Coalgebra/Convolution.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/HopfAlgebra/TensorProduct.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Localization/Finiteness.lean,Mathlib/RingTheory/Noetherian/Defs.lean,Mathlib/RingTheory/QuasiFinite/Basic.lean,Mathlib/RingTheory/QuasiFinite/Polynomial.lean,Mathlib/RingTheory/QuasiFinite/Weakly.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/Smooth/Fiber.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean,Mathlib/RingTheory/Unramified/LocalRing.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/IsTrivialOn.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean,Mathlib/Topology/EMetricSpace/Pi.lean,Mathlib/Topology/List.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean	100	6	['eric-wieser', 'github-actions', 'grunweg', 'marcelolynch', 'urkud']	nobody	2-58178 2 days ago	4-35947 4 days ago	4-35940 4 days
32828	Hagb author:Hagb	feat(Algebra/Order/Group/Defs): add `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`	It is similar to `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`, while with different hypotheses. The conclusion `IsOrderedCancelMonoid α` on `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid` still holds when the hypothesis `CommGroup α` is weakened to `CancelCommMonoid α` while `PartialOrder α` is strengthened to `LinearOrder α`. --- [`IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=IsOrderedAddMonoid.toIsOrderedCancelAddMonoid#doc) and `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`: https://github.com/leanprover-community/mathlib4/blob/97f78b1a4311fed1844b94f1c069219a48a098e1/Mathlib/Algebra/Order/Group/Defs.lean#L52-L62 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	15	['Garmelon', 'Hagb', 'Vierkantor', 'artie2000', 'dagurtomas', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	2-10624 2 days ago	116-47047 116 days ago	40-42357 40 days
39518	abeldonate author:abeldonate	feat(RingTheory/LocalProperties/Projective): Projective Module theorem	Theorem: R Noetherian, M finitely generated R-Mod. Then: M projective iff M_m free for all m maximal	t-ring-theory new-contributor large-import awaiting-author	21/0	Mathlib/RingTheory/LocalProperties/Projective.lean	1	5	['github-actions', 'mbkybky']	nobody	0-74045 20 hours ago	0-74045 20 hours ago	0-40435 11 hours
36299	grunweg author:grunweg	feat: metric connections	This file defines what it means for a connection on a Riemannian vector bundle `(V, g)` to be compatible with the metric `g`. Namely, the differentiated metric tensor `∇ g` (defined by `(X, σ, τ) ↦ X g(σ, τ) - g(∇_X σ, τ) - g(σ, ∇_X τ)`) should vanish on all differentiable vector fields `X` and differentiable sections `σ`, `τ`. From the path towards the Levi-Civita connection and Riemannian geometry. Co-authored-by: Heather Macbeth [25316162+hrmacbeth@users.noreply.github.com](mailto:25316162+hrmacbeth@users.noreply.github.com) Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- WIP: after the pre-requisite PRs below have been merged, update this PR with the current state on #36036. Then it will be ready for review again. - [x] depends on: #36279 - [x] depends on: #34263 - [x] depends on: #39485 - [ ] depends on: #39554 - [ ] depends on: #39513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry merge-conflict blocked-by-other-PR	296/0	Mathlib.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Metric.lean	3	23	['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'or4nge19', 'sgouezel']	nobody	0-22137 6 hours ago	73-23227 73 days ago	0-10 10 seconds

PRs addressing technical debt

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability tech debt	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	638-30420 1 year ago	702-20006 702 days ago	1-84718 1 day
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	637-40385 1 year ago	647-147 647 days ago	7-18420 7 days
33138	gasparattila author:gasparattila	chore(MeasureTheory/Measure/Stieltjes): remove `backward.privateInPublic`	In #32482, some definitions in this file were rewritten using private declarations. However, this made `StieltjesFunction.length` unusable, since its API uses private declarations even in statements. This PR fixes this by problem by specializing `length_eq` to `NoMinOrder` and adding a new lemma for the `OrderBot` case. The other lemmas involving the private declarations are made private, except for `length_subadditive_Icc_Ioo`, which is reverted to the previous statement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability tech debt awaiting-author	35/30	Mathlib/MeasureTheory/Measure/Stieltjes.lean	1	6	['github-actions', 'grunweg', 'sgouezel', 'vihdzp']	sgouezel assignee:sgouezel	144-24658 4 months ago	144-24658 144 days ago	5-1594 5 days
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter tech debt blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	4	['github-actions', 'grunweg', 'urkud']	nobody	112-28593 3 months ago	733-29587 733 days ago	0-15256 4 hours
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt t-topology t-algebra label:t-algebra$	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	107-24658 3 months ago	398-16261 398 days ago	0-954 15 minutes
36635	Vierkantor author:Vierkantor	chore(*): turn comments before declarations into docstrings	This PR goes through the whole of Mathlib and replaces `/- comments -/` with `/-- docstrings -/` or `/-! module docs -/` whenever they appear before a declaration. A lot of these appear to be simple typos, where a docstring was actually intended. Where a comment was originally intended, I would argue it is still a good idea include the comments in the generated documentation, or at least it does not hurt anyone. These instances were found by a linter, in an upcoming PR: #36636. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict	255/262	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Subgroup/MulOppositeLemmas.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/Group/Unbundled/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/WeaklyEtale.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Synonym.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Fourier/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Algebra/GelfandMazur.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Counting.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Fintype/Sets.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Set/Pointwise/Support.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeGroup/IsFreeGroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/MaximalSubgroups.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/UnivLE.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalLExpectation.lean,Mathlib/MeasureTheory/Function/JacobianOneDim.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/Measure/Haar/NormedSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/ModelTheory/Algebra/Field/CharP.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BourbakiWitt.lean,Mathlib/Order/CompleteLattice/Basic.lean	140	10	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	65-64960 2 months ago	55-54999 55 days ago	2-9741 2 days
36911	jjdishere author:jjdishere	fix(RingTheory/Valuation): change `ValueGroup` from taking HomClass to Hom	This PR refactors `MonoidWithZeroHom.valueMonoid`, `MonoidWithZeroHom.valueGroup`, `MonoidWithZeroHom.ValueGroup₀`, and `MonoidWithZeroHom.ValueGroup₀.embedding` to take a concrete `MonoidWithZeroHom` as input instead of a `MonoidWithZeroHomClass` instance, following rules described in [#mathlib4 > Mathlib's morphism hierarchy @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Mathlib.27s.20morphism.20hierarchy/near/554383157) As a result, we are able to remove several `erw` and many `set_option backward.isDefEq.respectTransparency false in`. The trade-off (foreseen by the same zulip thread) is that we now need to write an explicit coercion to `MonoidWithZeroHom` in `ValueGroup₀ (Valued.v (R := R) : R →*₀ Γ₀)`. Additionally, this PR fixes an instance on `NNReal`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #36532 - [ ] depends on: #36777	t-ring-theory tech debt blocked-by-other-PR merge-conflict	559/483	Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/Padics/Complex.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/DiscreteValuativeRel.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	24	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	53-3648 1 month ago	59-35515 59 days ago	0-60 1 minute
39011	Vierkantor author:Vierkantor	chore(Algebra/Polynomial/Module): workaround for backward.inferInstanceAs	This PR, like #38990, works around a `backward.inferInstanceAs` compatibility flag introduced by identifying `PolynomialModule` with `Finsupp` in our definitions. We introduce a new dsimp lemma `funLike_eq` that transfers the `FunLike` instances, and now we can use `PolynomialModule`'s `FunLike` instance, instead of the custom `CoeFun` instance. This is not a great approach, but it seems the least painful for the short term. The alternative would be to strictly enforce the defeq barrier between `PolynomialModule` and `Finsupp`, which would mean a substantial rewrite of this corner of Mathlib. We can't make `PolynomialModule` an `@[implicit_reducible]`, because we need different multiplication on it than `Finsupp` has. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt label:t-algebra$	8/5	Mathlib/Algebra/Polynomial/Module/Basic.lean	1	1	['github-actions']	jcommelin assignee:jcommelin	7-12779 7 days ago	12-41730 12 days ago	12-41723 12 days
38990	Vierkantor author:Vierkantor	chore(Algebra/DirectSum): workaround for `backward.inferInstanceAs`	This PR works around a `backward.inferInstanceAs` compatibility flag introduced by identifying `DirectSum` with `DFinsupp` in our definitions. We introduce a new dsimp lemma `funLike_eq` that transfers the `FunLike` instances, and now we can use `DirectSum`'s `FunLike` instance, instead of the custom `CoeFun` instance. I unsqueezed a few `simp`s, which all ran pretty much instant on my machine so it shouldn't cause much slowdown. Also we fix two porting notes. This is not a great approach, but it seems the least painful for the short term. The alternative would be to strictly enforce the defeq barrier between `DirectSum` and `DFinsupp`, which would mean a substantial rewrite of this corner of Mathlib. We can't make `DirectSum` an `@[implicit_reducible]`, because we need different multiplication on it than `DFinsupp` has. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt t-ring-theory awaiting-author label:t-algebra$	36/38	Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	9	3	['JovanGerb', 'Vierkantor', 'github-actions']	JovanGerb assignee:JovanGerb	3-59619 3 days ago	4-51028 4 days ago	8-19465 8 days
39386	MichaelStollBayreuth author:MichaelStollBayreuth	chore: shake --keep-implied --keep-prefix --fix	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt large-import merge-conflict	113346/9457	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Epi.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Shrink.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/Algebra/Subalgebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Rank.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Balance.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Field.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Gaps.lean,Mathlib/Algebra/BigOperators/Group/Finset/Indicator.lean,Mathlib/Algebra/BigOperators/Group/Finset/Interval.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Pi.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Powerset.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Algebra/BigOperators/Module.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/BigOperators/Ring/Nat.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/BigOperators/Sym.lean,Mathlib/Algebra/BigOperators/WithTop.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/AlgCat/Symmetric.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BialgCat/Monoidal.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean	7976	3	['MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts']	nobody	3-44565 3 days ago	4-38397 4 days ago	0-2 2 seconds
39479	wwylele author:wwylele	chore(RingTheory/HahnSeries): remove a defeq abuse	Previously the simp implicitly uses `⟨⟨((↑) : ℕ → Γ),...⟩,...⟩.toFun = (↑)`. This explicitly writes out the intermediate term so the it no longer relies on defeq. Also changed the statement of ofPowerSeries_apply to reuse existing embedding --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory tech debt	9/12	Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/LaurentSeries.lean	2	1	['github-actions']	nobody	2-29983 2 days ago	2-30059 2 days ago	2-30160 2 days
39499	MichaelStollBayreuth author:MichaelStollBayreuth	chore: run `lake shake` successively from the leaves	We do the experiment from #39481 in reverse order: starting from the leaves, run `lake shake --force --only --fix` and then `lake build` until something breaks. Then fix the problems manually and continue. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt	8057/0	MS_test/topsort.txt	1	2	['MichaelStollBayreuth', 'github-actions']	nobody	1-66179 1 day ago	1-78938 1 day ago	0-1 1 second
39481	MichaelStollBayreuth author:MichaelStollBayreuth	chore: run `lake shake` iteratively and fix problems	This adds `-- shake: keep-all` to all modules under `Mathlib.Lean`, `Mathlib.Tactic` and `Mathlib.Util`. Then it goes through the remaining modules in topological order (according to the list in `MS_test/topsort3.txt`) and for each of them, runs `lake shake --force --only --fix`, followed by `lake build `. If there is no error, the changes are commited. Otherwise, the problems are fixed manually; then the changes are committed. This has been done for the first ~400 modules in the list. 38 of them required manual fixes; they are listed in `MS_test/after_shake_fixes.txt`. We note that the import stats bot claims that the number of imports actually increases in most files, which somehow runs counter expectations... Discussion: [#mathlib4 > shake without --add-public @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/shake.20without.20--add-public/near/595349216) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt large-import merge-conflict	9178/858	MS_test/after_shake_fixes.txt,MS_test/topsort3.txt,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Hom.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Expr.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/FreeMonoid/Count.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Basic.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/ModEq.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/GroupWithZero/Opposite.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/GroupWithZero/Regular.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/NeZero.lean,Mathlib/Algebra/Notation.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Quotient.lean,Mathlib/Algebra/Regular/Basic.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/GrindInstances.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/InjSurj.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean	690	2	['github-actions', 'mathlib-merge-conflicts']	nobody	1-18308 1 day ago	unknown	0-0 0 seconds
39477	wwylele author:wwylele	chore(LinearAlgebra/Ray): remove a defeq abuse	Previously, the code uses Subtype constructor to construct RayVector, and the instance cannot see through this. As a common practice, RayVector declares its own constructor to resolve this --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt maintainer-merge label:t-algebra$	14/4	Mathlib/LinearAlgebra/Ray.lean	1	6	['Vierkantor', 'github-actions', 'robin-carlier', 'wwylele']	nobody	0-34234 9 hours ago	0-34234 9 hours ago	2-6646 2 days
38957	wwylele author:wwylele	chore(GroupTheory/DivisibleHull): remove `backward.privateInPublic`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-group-theory	5/12	Mathlib/GroupTheory/DivisibleHull.lean	1	9	['Komyyy', 'github-actions', 'grunweg', 'jcommelin', 'wwylele']	jcommelin assignee:jcommelin	0-27630 7 hours ago	8-7104 8 days ago	13-52279 13 days

PRs blocked on a zulip discussion

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip t-order label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['YaelDillies', 'astrainfinita', 'github-actions', 'j-loreaux']	nobody	544-59453 1 year ago	551-52012 551 days ago	33-64877 33 days
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-computability merge-conflict awaiting-zulip	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	378-22730 1 year ago	647-45915 647 days ago	0-179 2 minutes
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	12	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud']	nobody	318-3079 10 months ago	589-37122 589 days ago	0-66650 18 hours
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry awaiting-zulip new-contributor	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	318-1917 10 months ago	350-63434 350 days ago	6-47693 6 days
28803	astrainfinita author:astrainfinita	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. This PR continues the work from #23961. - Change `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` so they no longer carry algebraic data. - Deprecate `ESeminormed(Add)CommMonoid` and `ENormed(Add)CommMonoid` in favor of `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` with a commutative algebraic typeclass. \|Old\|New\| \|---\|---\| \| `[ESeminormed(Add)(Comm)Monoid E]` \| `[(Add)(Comm)Monoid E] [ESeminormed(Add)Monoid E]` \| \| `[ENormed(Add)(Comm)Monoid]` \| `[(Add)(Comm)Monoid E] [ENormed(Add)Monoid]` \| See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2328803.20refactor.3A.20unbundle.20algebra.20from.20.60ENormed*.60/with/536024350) ------------ - [x] depends on: #28813	t-algebra merge-conflict slow-typeclass-synthesis awaiting-zulip t-analysis label:t-algebra$	80/63	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	14	28	['astrainfinita', 'bryangingechen', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	grunweg assignee:grunweg	258-17562 8 months ago	266-55116 266 days ago	0-20585 5 hours
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	4	['euprunin', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	214-81172 7 months ago	266-26569 266 days ago	0-1 1 second
30150	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory	Add `AddMonoidalCategory`, the additive version of `MonoidalCategory`. To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since existing code relies on the `AddMonoid M → MonoidalCategory M` instance. For now, we simply implement the additive variants by hand instead. --- As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`. I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`. Next steps would be to: - Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory` - Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory large-import new-contributor merge-conflict awaiting-zulip t-meta	444/125	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	22	['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem', 'mathlib4-merge-conflict-bot']	nobody	187-5646 6 months ago	226-70712 226 days ago	1-160 1 day
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	307/5	Mathlib/Computability/NFA.lean	1	27	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	182-22778 6 months ago	601-50166 601 days ago	45-84611 45 days
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711']	nobody	181-39019 6 months ago	527-2549 527 days ago	23-54870 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-zulip new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	7	['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey']	nobody	180-76187 5 months ago	378-22716 378 days ago	75-77754 75 days
11800	JADekker author:JADekker	feat: KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology awaiting-zulip	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	180-48053 5 months ago	655-68335 655 days ago	123-25636 123 days
30668	astrainfinita author:astrainfinita	feat: `QuotType`	This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotType` API for type synonyms of `Quot` and `Quotient` will avoid defeq abuse caused by directly using `Quot` and `Quotient` APIs. This PR also adds some typeclasses to support different ways to find the quotient map that should be used. See the documentation comments of these typeclasses for examples of usage. --- It's not a typical design to use these auxiliary typeclasses and term elaborators, but I haven't found a better way to support these notations. Some of the naming may need to be discussed. For example: - `⟦·⟧` is currently called `mkQ` in names. This distinguishes it from other `.mk`s and makes it possible to write the quotient map as `mkQ` `mkQ'` ~~`mkQ_ h`~~. But this will also require changing the old lemma names. - It would be helpful if the names of new type classes explained their functionality better. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/migrate.20to.20.60QuotLike.60.20API) This PR continues the work from #16421. Original PR: https://github.com/leanprover-community/mathlib4/pull/16421	RFC t-data awaiting-zulip awaiting-author	629/0	Mathlib.lean,Mathlib/Data/QuotType.lean,MathlibTest/QuotType.lean	3	22	['SnirBroshi', 'YaelDillies', 'astrainfinita', 'dagurtomas', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	159-29899 5 months ago	211-85152 211 days ago	0-81 1 minute
33368	urkud author:urkud	feat: define `Complex.UnitDisc.shift`	Also review the existing API UPD: I'm going to define a `PSL(2, Real)` action instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-zulip merge-conflict	273/39	Mathlib.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean	3	7	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	j-loreaux assignee:j-loreaux	131-84612 4 months ago	132-44945 132 days ago	7-10690 7 days
33031	chiyunhsu author:chiyunhsu	feat(Combinatorics/Enumerative/Partition): add combinatorial proof of Euler's partition theorem	The new file EulerComb.lean contains the combinatorial proof of Euler's partition theorem. The analytic proof of the theorem and its generalization of Glaisher's Theorem has already been formalized in [Glaisher.lean](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean). The generalization of the combinatorial proof from this file to Glaisher's Theorem is within reach. --- Zulip discussion: [#mathlib4 > Glaisher’s Bijection on integer partitions](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Glaisher.E2.80.99s.20Bijection.20on.20integer.20partitions/with/570808111) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-zulip awaiting-author	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	7	['chiyunhsu', 'dagurtomas', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	109-51865 3 months ago	109-51865 109 days ago	42-21618 42 days
32742	LTolDe author:LTolDe	feat(MeasureTheory/Constructions/Polish/Basic): add class SuslinSpace	add new class `SuslinSpace` for a topological space that is an analytic set in itself This will be useful to prove the Effros Theorem, see [zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-measure-probability awaiting-author	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	10	['ADedecker', 'LTolDe', 'dagurtomas', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	106-64275 3 months ago	132-48407 132 days ago	25-76907 25 days
26299	adomani author:adomani	perf: the `whitespace` linter only acts on modified files	Introduces an `IO.Ref` to allow the `commandStart` linter to only run on files that git considers modified with respect to `master`. The linter is also active on files that have had some error, as these are likely being modified! The PR should also mitigate the speed-up that the linter introduced: [#mathlib4 > A whitespace linter @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20whitespace.20linter/near/525091877) Assuming that this goes well, a similar mechanism could be applied to several linters that do not need to run on all code, just on the modified code. Implementation detail: the linter is currently either on or off in "whole" files. It may be also a future development to make this more granular and only run the linter on "modifed commands in modified files", but this is not currently the plan for this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-zulip awaiting-author	55/7	Mathlib/Tactic/Linter/Whitespace.lean	1	20	['adomani', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-bot', 'leanprover-radar', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	89-75049 3 months ago	262-71367 262 days ago	66-73556 66 days
35524	grunweg author:grunweg	feat: text-based linter against \t followed by tactic mode	Wait for the zulip discussion to converge. If there is consensus in favour of this change, summarise the motivation here. [zulip discuss](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/proposal.3A.20no.20more.20use.20of.20.60.E2.96.B8.60.20in.20Mathlib.3F/with/574680826) --- There are currently 80 remaining exceptions in mathlib: ideally, these would get fixed before merging this. Works best when combined with #35523. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-zulip merge-conflict	23/2	Mathlib/Tactic/Linter/TextBased.lean	1	5	['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'vihdzp']	nobody	87-45668 2 months ago	88-68440 88 days ago	0-3308 55 minutes
35578	Shreyas4991 author:Shreyas4991	fix: writer monad should use an additive logging type	The Writer monad's w type is supposed to be additive, not multiplicative. This is how it is conceptually used in Haskell (as a logging type). Haskell uses `Monoid` because it doesn't make a distinction between `AddMonoid` and `Monoid`. [#mathlib4 > Writer should use an additive monoid @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Writer.20should.20use.20an.20additive.20monoid/near/574990415) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip merge-conflict	10/10	Mathlib/Control/Monad/Cont.lean,Mathlib/Control/Monad/Writer.lean	2	5	['Shreyas4991', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	87-24182 2 months ago	87-24183 87 days ago	0-18707 5 hours
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	60	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud']	nobody	81-69421 2 months ago	427-47360 427 days ago	48-67492 48 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	81-69405 2 months ago	378-51299 378 days ago	39-60525 39 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-zulip new-contributor awaiting-author	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	42	['YaelDillies', 'dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	81-3034 2 months ago	345-32333 345 days ago	34-10092 34 days
34963	Parcly-Taxel author:Parcly-Taxel	feat(Archive): proof of the Robbins conjecture	Cf. [#mathlib4 > Alternative axiomatization of boolean algebras @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Alternative.20axiomatization.20of.20boolean.20algebras/near/558900960) and #31924.	t-algebra awaiting-zulip label:t-algebra$	610/0	Archive.lean,Archive/Robbins.lean	2	2	['chrisflav', 'github-actions']	chrisflav assignee:chrisflav	79-41475 2 months ago	28-41450 28 days ago	71-52253 71 days
30750	SnirBroshi author:SnirBroshi	feat(Data/Quot): `toSet` and `equivClassOf`	Define `toSet` which gets the set corresponding to an element of a quotient, and `equivClassOf` which gets the equivalence class of an element under a quotient. --- I found these definitions helpful when working with quotients, specifically `ConnectedComponents` of a `TopologicalSpace`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author awaiting-zulip	162/0	Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Setoid/Basic.lean	4	8	['SnirBroshi', 'TwoFX', 'eric-wieser', 'github-actions', 'linesthatinterlace', 'mathlib-merge-conflicts']	TwoFX assignee:TwoFX	76-71635 2 months ago	172-74975 172 days ago	36-69524 36 days
36890	vihdzp author:vihdzp	chore(SetTheory): `le_mul_left` → `le_mul_of_pos_left`	The new theorem names/statements match [`Nat.le_mul_of_pos_left`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Nat/Lemmas.html#Nat.le_mul_of_pos_left). The cardinal one has also been moved to an earlier file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-zulip merge-conflict	28/23	Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Free.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Notation.lean	6	2	['github-actions', 'mathlib-merge-conflicts']	nobody	56-79590 1 month ago	59-66330 59 days ago	0-10825 3 hours
38546	yhx-12243 author:yhx-12243	fix: universe issue in injective module	Change the definition of ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type v⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` into ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type u⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` to make it agree with `Module.Baer` and real mathematical definition, without universe issues. Since the criterion `Module.Flat` also uses `Type u` on testing modules. See discussions in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Universe.20issue.20about.20injective.20module . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-zulip label:t-algebra$	57/43	Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean,Mathlib/RingTheory/Flat/Tensor.lean,Mathlib/RingTheory/LocalProperties/Injective.lean	6	5	['github-actions', 'grunweg', 'mathlib-bors', 'wwylele']	nobody	22-28139 22 days ago	22-28150 22 days ago	0-26133 7 hours
37346	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉 * `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉 * `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉 * `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉 * `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge awaiting-zulip	7/45	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	22	['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg']	nobody	19-60363 19 days ago	19-60394 19 days ago	30-49603 30 days
32608	PrParadoxy author:PrParadoxy	feat(LinearAlgebra/PiTensorProduct): API for PiTensorProducts indexed by sets	This PR addresses a TODO item in LinearAlgebra/PiTensorProduct.lean: * API for the various ways ι can be split into subsets; connect this with the binary tensor product -- specifically by describing tensors of type ⨂ (i : S), M i, for S : Set ι. Our primary motivation is to formalise the notion of "restricted tensor products". This will be the content of a follow-up PR. Beyond that, the Set API is natural in contexts where the index type has an independent interpretation. An example is quantum physics, where ι ranges over distinguishable degrees of freedom, and where its is common practice to annotate objects by the set of indices they are defined on. --- Stub file with preliminary definition of the restricted tensor product as a direct limit of tensors indexed by finite subsets of an index type: https://github.com/PrParadoxy/mathlib4/blob/restricted-stub/Mathlib/LinearAlgebra/PiTensorProduct/Restricted.lean --- - [x] depends on: #32598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-algebra WIP label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	31	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-30650 7 days ago	147-41372 147 days ago	10-66980 10 days
39233	linesthatinterlace author:linesthatinterlace	feat: `Pi.map` rename to `Function.map`	This PR renames `Pi.map` to `Function.map` and makes the changes necessary to support this. In particular this means that Mathlib.Logic.Function.Defs now only contains the Function namespace. Zulip thread: [#PR reviews > #39233 - rename Pi.map to Function.map @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2339233.20-.20rename.20Pi.2Emap.20to.20Function.2Emap/near/594605689) General discussion regarding the Pi namespace: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20Pi.20namespace/near/594782721 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	131/122	Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Control/Bifunctor.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Pi.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/RestrictedProduct/TopologicalSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NhdsWithin.lean	37	1	['github-actions']	nobody	5-72807 5 days ago	6-47486 6 days ago	0-7302 2 hours
39026	fpvandoorn author:fpvandoorn	feat: add assume tactic	Teaching tactic: `assume p, q, r` is short for `intro (_ : p) (_ : q) (_ : r)`. --- [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Assume.20tactic/with/593477478) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-meta awaiting-author	123/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Assume.lean,MathlibTest/Assume.lean	4	7	['fpvandoorn', 'github-actions', 'joneugster']	joneugster assignee:joneugster	4-34036 4 days ago	11-67946 11 days ago	0-1 1 second
32828	Hagb author:Hagb	feat(Algebra/Order/Group/Defs): add `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`	It is similar to `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`, while with different hypotheses. The conclusion `IsOrderedCancelMonoid α` on `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid` still holds when the hypothesis `CommGroup α` is weakened to `CancelCommMonoid α` while `PartialOrder α` is strengthened to `LinearOrder α`. --- [`IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=IsOrderedAddMonoid.toIsOrderedCancelAddMonoid#doc) and `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`: https://github.com/leanprover-community/mathlib4/blob/97f78b1a4311fed1844b94f1c069219a48a098e1/Mathlib/Algebra/Order/Group/Defs.lean#L52-L62 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	15	['Garmelon', 'Hagb', 'Vierkantor', 'artie2000', 'dagurtomas', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	2-10624 2 days ago	116-47047 116 days ago	40-42357 40 days

PRs with just a merge conflict

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order t-logic	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	656-74033 1 year ago	706-52435 706 days ago	64-12984 64 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	237/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	6	4	['FMLJohn', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	896-63928 896 days ago	1-57831 1 day
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	37	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel', 'vihdzp']	nobody	656-74031 1 year ago	931-39528 931 days ago	35-63136 35 days
7875	astrainfinita author:astrainfinita	chore: make `SMulCommClass A A B` and `SMulCommClass A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	54/48	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/Ring.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/ContinuousFunction/ContinuousMapZero.lean,Mathlib/Topology/ContinuousFunction/StoneWeierstrass.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	27	15	['Parcly-Taxel', 'astrainfinita', 'jcommelin', 'leanprover-bot']	nobody	656-74031 1 year ago	711-4139 711 days ago	1-47913 1 day
6491	eric-wieser author:eric-wieser	chore(Mathlib/Algebra/Hom/GroupAction): add `SMulHomClass.comp_smul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	656-74030 1 year ago	928-60030 928 days ago	83-76369 83 days
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	642-67575 1 year ago	768-76412 768 days ago	53-73442 53 days
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability tech debt	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	638-30420 1 year ago	702-20006 702 days ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [x] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry t-category-theory	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg']	nobody	638-30279 1 year ago	766-47220 766 days ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	638-30178 1 year ago	724-40162 724 days ago	29-50022 29 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	637-51332 1 year ago	672-57554 672 days ago	56-40668 56 days
10350	Shamrock-Frost author:Shamrock-Frost	feat(Data/Setoid): add the operations of taking the equivalence class of an element and of saturating a set wrt an equivalence relation	I'm open to suggestions about changing the name "saturate", someone on zulip rightly pointed out this is a very overloaded term in math. That said, I think it's unlikely to cause confusion and that there's only one reasonable interpretation in the context of setoids. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	169/3	Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Order/Closure.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	635-53606 1 year ago	754-45234 754 days ago	19-74546 19 days
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	137/2	Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Set/Finite.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Quotients.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/Action/Concrete.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/State.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/SetTheory/Surreal/Multiplication.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/UniformSpace/Separation.lean,test/interactiveUnfold.lean	68	1	['github-actions']	nobody	596-2271 1 year ago	596-2271 596 days ago	4-72805 4 days
13156	erdOne author:erdOne	refactor(Algebra/Module/LocalizedModule): Redefine `LocalizedModule` in terms of `OreLocalization`.	--- - [x] depends on: #13151 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	519/628	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	8	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	581-54553 1 year ago	581-54553 581 days ago	51-84473 51 days
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-order new-contributor label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	558-84137 1 year ago	558-84137 558 days ago	7-45599 7 days
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	538-60892 1 year ago	538-60892 538 days ago	7-68089 7 days
19337	zeramorphic author:zeramorphic	feat(Data/Finsupp): generalise `Finsupp` to any "zero" value	Remove the explicit dependence of `Finsupp` on `[Zero M]`, instead defining `Finsupp'` (better name pending) to be functions that are equal to a fixed value `z : M` cofinitely often. This PR is intended to do the initial work of replacing the definition of `Finsupp` with an instantiation of the more general definition, without adding any appropriate API. If accepted, the API development will follow in later PRs. Issues to consider: - Naming of `Finsupp'.` - Where should `Finsupp'` lemmas go? Do they need their own file/folder under `Data/`? Relevant Zulip threads: - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp.20generalisations - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp-like.20partial.20function Comments are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	203/83	Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/PowerBasis.lean,scripts/nolints_prime_decls.txt	13	5	['github-actions', 'vihdzp', 'zeramorphic']	nobody	536-36969 1 year ago	536-36969 536 days ago	4-60621 4 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	50/28	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	525-2638 1 year ago	525-2638 525 days ago	31-53021 31 days
16120	awainverse author:awainverse	feat(ModelTheory/Algebra/Ring/Basic): Ring homomorphisms are a `StrongHomClass` for the language of rings	Adds an `IsAlgebraic` instance to the language of rings Adds a `StrongHomClass` instance to the type of ring homomorphisms between rings with `CompatibleRing` structures --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra RFC t-logic label:t-algebra$	34/13	Mathlib/ModelTheory/Algebra/Ring/Basic.lean	1	10	['ChrisHughes24', 'YaelDillies', 'awainverse', 'github-actions', 'jcommelin']	nobody	497-18812 1 year ago	497-18812 497 days ago	135-29017 135 days
20527	trivial1711 author:trivial1711	refactor(Topology/UniformSpace/Completion): more descriptive names for `α → Completion α`	- We rename the various maps `α → Completion α` in order to make their names more consistent. - Let `α` be a uniform space. We rename the uniformly continuous function `α → Completion α` from `UniformSpace.Completion.coe'` to `UniformSpace.Completion.coe`. - Let `α` be a uniform additive group. We rename the additive group homomorphism `α →+ Completion α` from `UniformSpace.Completion.toCompl` to `UniformSpace.Completion.coeAddHom`. - Let `α` be a uniform ring. The ring homomorphism `α →+* Completion α` is called `UniformSpace.Completion.coeRingHom`; its name is unchanged. - Let `α` be a normed space over a field `𝕜`. We rename the linear isometry `α →ₗᵢ[𝕜] Completion α` from `UniformSpace.Completion.toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ`. - Let `α` be a normed space over a field `𝕜`. We rename the continuous linear map `α →L[𝕜] Completion α` from `UniformSpace.Completion.toComplL` to `UniformSpace.Completion.coeL`. - Let `α` be a normed additive group. We rename the norm preserving homomorphism `NormedAddGroupHom α (Completion α)` from `NormedAddCommGroup.toCompl` to `UniformSpace.Completion.coeNormedAddGroupHom`. - We analogously rename some other theorems. - We add some trivial theorems (all of which are proved by `rfl`) that state that the functions considered above are equal. We give all of them the `simp` and `norm_cast` attributes. - We add a new theorem `UniformSpace.Completion.coeAddHom_eq_coe` that states that `UniformSpace.Completion.coeAddHom` and `UniformSpace.Completion.coe` are equal as functions. - We similarly add a new theorem `UniformSpace.Completion.coeRingHom_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplL` to `UniformSpace.Completion.coeL_eq_coe`. - We similarly add a new theorem `UniformSpace.Completion.coeNormedAddGroupHom_eq_coe`. - We change all occurrences of the string `((↑) : α → Completion α)` to `(coe : α → Completion α)` or just `coe`. - We put the statements of some theorems into simp normal form by using the plain function `coe` rather than the homomorphisms that carry more structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	130/92	Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Category/UniformSpace.lean,Mathlib/Topology/MetricSpace/Completion.lean,Mathlib/Topology/UniformSpace/Completion.lean	17	4	['eric-wieser', 'github-actions', 'trivial1711']	nobody	490-49844 1 year ago	490-49844 490 days ago	6-66637 6 days
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-data label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	488-36874 1 year ago	488-36874 488 days ago	76-66907 76 days
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-measure-probability new-contributor	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	475-61131 1 year ago	475-61131 475 days ago	27-43617 27 days
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology new-contributor	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	439-47152 1 year ago	439-47152 439 days ago	16-76141 16 days
18470	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Normed.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-analysis label:t-algebra$	28/0	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean	2	9	['astrainfinita', 'github-actions', 'jcommelin', 'leanprover-bot']	nobody	435-18579 1 year ago	435-18579 435 days ago	129-16341 129 days
8767	eric-wieser author:eric-wieser	refactor(Cache): tidy lake-manifest parsing in Cache	This now respects local copies of Mathlib dependencies (though in practice these invalidate the online cache because to point to local copies of Mathlib, the hash for `lakefile.lean` and `lake-manifest.json` is first invalidated). --- - [x] depends on: #11492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	432-18311 1 year ago	613-70661 613 days ago	119-35643 119 days
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	427-69407 1 year ago	427-69407 427 days ago	10-48025 10 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory new-contributor	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	404-55554 1 year ago	404-55555 404 days ago	58-6026 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory large-import	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	404-55552 1 year ago	404-55554 404 days ago	36-69400 36 days
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	398-80518 1 year ago	398-80520 398 days ago	55-52030 55 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	114/60	Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/Topology/Algebra/Group/Compact.lean	6	14	['astrainfinita', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	398-25411 1 year ago	646-63741 646 days ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	240/92	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Util/NoInstances.lean,scripts/noshake.json	50	8	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	398-25187 1 year ago	602-64734 602 days ago	14-58900 14 days
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	391-68428 1 year ago	404-79069 404 days ago	0-265 4 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	389-45203 1 year ago	389-45205 389 days ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	389-33900 1 year ago	389-33901 389 days ago	2-11655 2 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import new-contributor	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	356-40650 11 months ago	356-40652 356 days ago	35-30364 35 days
16020	adomani author:adomani	feat: compare PR `olean`s size with `master`	Adds two CI steps: * `print the sizes of the oleans` that prints the sizes of all the folders containing `Mathlib` `.olean`s; * `compare oleans` that compares the sizes of the previous step with the corresponding sizes on `master`. In the test runs, the two steps have taken at most 3 seconds combined (the first is virtually instantaneous, the second one depends on `curl` to find a job id and on `gh` to retrieve the logs of a previous CI run -- everything else appears to be negligible). This hopefully helps finding out if some PR is bloating up the `.olean`s. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Error.3A.20No.20space.20left.20on.20device/near/463792355) for a PR of mine that prompted this check. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	50	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	347-4257 11 months ago	544-51679 544 days ago	87-65841 87 days
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-convex-geometry	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	345-63477 11 months ago	345-63479 345 days ago	6-38644 6 days
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	847/159	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	3	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55218 10 months ago	565-53117 565 days ago	0-679 11 minutes
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	699/21	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55216 10 months ago	565-54760 565 days ago	0-619 10 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	771/168	Mathlib.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	5	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55215 10 months ago	565-55402 565 days ago	0-638 10 minutes
13964	pechersky author:pechersky	feat(Data/DigitExpansion): begin defining variant of reals without rationals	Based on a de Bruijn 1976 paper. This file is just the basic definition of a digit expansion. Will be followed up with further constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	330-37506 10 months ago	568-63722 568 days ago	129-57999 129 days
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	21	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	318-2166 10 months ago	318-2166 318 days ago	37-56728 37 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	35	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	318-1920 10 months ago	318-1921 318 days ago	45-4165 45 days
25988	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products	This PR continues the work from #24593. Original PR: https://github.com/leanprover-community/mathlib4/pull/24593	merge-conflict t-algebraic-geometry	1000/1022	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	6	3	['Multramate', 'github-actions', 'leanprover-community-bot-assistant']	nobody	318-1608 10 months ago	318-1608 318 days ago	18-21880 18 days
26067	mapehe author:mapehe	feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range	This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	314-69386 10 months ago	314-69386 314 days ago	20-8582 20 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	287-66648 9 months ago	318-1917 318 days ago	38-26044 38 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	286-68669 9 months ago	539-62262 539 days ago	20-16585 20 days
26200	adomani author:adomani	fix: add label when landrun fails	Adds the `permission-denied` label on PRs that get blocked by landrun. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	68/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	286-17601 9 months ago	286-17601 286 days ago	46-52210 46 days
27451	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	280-50104 9 months ago	280-50105 280 days ago	17-52359 17 days
27987	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	--- The pullback PR of #26827 and #27451. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory large-import	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	280-49733 9 months ago	280-49734 280 days ago	6-6455 6 days
27003	eric-wieser author:eric-wieser	chore: use `Simp.ResultQ` more often	Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	18/22	Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean	3	7	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	278-64357 9 months ago	278-64358 278 days ago	32-70098 32 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	278-19153 9 months ago	278-19153 278 days ago	71-27957 71 days
28622	alreadydone author:alreadydone	chore(Mathlib): replace `=>` by `↦`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	51792/51792	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/HopfAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean	3838	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	272-22633 8 months ago	272-22634 272 days ago	0-62065 17 hours
28626	alreadydone author:alreadydone	chore(Archive, Counterexamples): replace => by ↦	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	288/288	Archive/Arithcc.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/PropEncodable.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/GameMultiplication.lean,Counterexamples/Girard.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean	54	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	270-51759 8 months ago	270-51760 270 days ago	2-47136 2 days
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	268-84795 8 months ago	291-60717 291 days ago	7-54661 7 days
28042	kckennylau author:kckennylau	feat(Topology/ValuativeRel): a topological basis indexed by pairs of elements	--- The pullback PR of #27314 and #27163. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	268-84749 8 months ago	278-49793 278 days ago	7-4998 7 days
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	268-46627 8 months ago	291-60718 291 days ago	7-62439 7 days
28148	kckennylau author:kckennylau	feat(Matrix): Simproc and Rw-proc for Matrix Transpose	Co-authored by Aaron Liu. ```lean example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of% 2 3] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by simp only [matrix_transpose] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	267/8	Mathlib.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,MathlibTest/Simproc/Matrix.lean,MathlibTest/matrix.lean,scripts/noshake.json	8	32	['eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'plp127']	eric-wieser assignee:eric-wieser	264-3561 8 months ago	264-3562 264 days ago	12-78143 12 days
26908	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): alternative ext principle for unitors	Currently, our infrastructure for left/right unitors for Day convolution of functors `C ⥤ V` do not have satisfactory extensionality principle: the current way to characterize morphisms out of `U ⊛ F` is the default extensionality principle for Day convolution, which characterizes first such functors via functors out of `U ⊠ F`. Left unitors are then obtained using the fact `U ⊠ F` is a left Kan extension of a functor from `PUnit × C` (which is equivalent to `C`) but we did not record on its own this principle. Using the transitivity of left Kan extensions proved in #26899, we directly exhibit `U ⊛ F` as a left Kan extension of `F ⋙ tensorLeft (𝟙_ V)` along `tensorLeft (𝟙_ C)`. The unit of this Kan extension is composed exactly of the morphisms that appear in the [characterization of left unitors](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Monoidal/DayConvolution.html#CategoryTheory.MonoidalCategory.DayConvolutionUnit.leftUnitor_hom_unit_app). We also slightly generalize the instances that express that external products with unitors are left Kan extensions, so that they can be used when taking external products with more complicated functors than currently. This is again useful when chaining extensionality lemmas for morphisms out of terms of the form `(F ⊛ U) ⊛ G`. We prove a similar thing for right unitors With this, it should be possible to have a much more satisfactory way of working with Day convolutions: this allows to "elimiinate" units without ending up with terms in an external product. --- - [ ] depends on: #26899 - [ ] depends on: #26906 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	307/18	Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	252-49907 8 months ago	252-49908 252 days ago	0-1812 30 minutes
27150	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for braided and symmetric structure on day convolutions monoidal categories	Following the pattern in #27119, we give API to construct `BraidedCategory` and `SymmetricCategory` structures on a monoidal category equipped with a `LawfulDayConvolutionMonoidalCategoryStruct`. To achieve this, we introduce an other type class `LawfulDayConvolutionBraidedCategoryStruct` that bundles an associator isomorphism that behaves like the one constructed for functors in #27067. We provide a noncomputable constructor for this typeclass that takes as input fullness of the "realization" functor to a category of functors, and we show that the typeclasses are sufficient to define the desired structures. --- - [x] depends on: #27067 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	826/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	252-44946 8 months ago	307-74641 307 days ago	0-1002 16 minutes
27119	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for closed monoidal day convolution monoidal structures	Following the pattern introduced in #26798 and #26820 and using results of #26879, we introduce a typeclass `LawfulDayConvolutionClosedMonoidalCategoryStruct` that encodes the data needed on a `LawfulDayConvolutionMonoidalCategoryStruct` to define well-behaved internal homs. We give a constructor assuming existence of relevant ends, and prove that this data defines a `MonoidalClosed` instance on the monoidal category structures one can deduce from `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #27079 - [x] depends on: #27091 - [x] depends on: #26879 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	900/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean	2	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	251-58797 8 months ago	308-80109 308 days ago	0-1 1 second
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	merge-conflict t-logic new-contributor	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	251-52658 8 months ago	251-52659 251 days ago	10-61840 10 days
26154	ADedecker author:ADedecker	refactor: add refactored APIs for algebraic filter bases	This PR continues the work from #18437. Original PR: https://github.com/leanprover-community/mathlib4/pull/18437	merge-conflict t-topology	651/0	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	5	3	['ADedecker', 'github-actions', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	245-64902 8 months ago	245-64903 245 days ago	87-79752 87 days
29330	plp127 author:plp127	chore: define `Fin.cycleIcc` with conditions	Redefine `Fin.cycleIcc` using conditionals instead of composing existing `Fin` operations together. Its worst-case runtime drops from O(n) to O(1). As a bonus, the definition no longer needs explaining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-group-theory	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	236-76499 7 months ago	236-76500 236 days ago	20-3817 20 days
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-number-theory	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	234-51609 7 months ago	315-51546 315 days ago	73-10873 73 days
27214	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares	In this PR, we give the definition and first basic properties of categorical pullback squares. Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`. We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`. Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence. --- - [ ] depends on: #26679 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	786/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41691 7 months ago	231-41692 231 days ago	0-4464 1 hour
26466	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category	Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object. Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid. This PR was split from #25743. --- - [ ] depends on: #25743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology t-category-theory	571/111	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean	6	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	230-61093 7 months ago	325-68377 325 days ago	0-1708 28 minutes
26578	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): adjunctions of categorical cospans	We build upon the bicategory-like structure developed in #26447 and #26412 to define the notion of adjunctions of categorical cospans. This is a structure encoding the data of two `CatCospanTransform`s, along with the usual unit and counit morphisms as part of the data, satisfying the usual left and right triangle identities. We provide basic API for these, such as extracting adjunctions between individual components. We also provide a proof that the notion satisfies a "coherence": with our chosen constructor, the forward direction of the structure `CatCommSq` on the left adjoints correspond to the inverse of the square for the right adjoints through `mateEquiv`. These adjunctions will be used as a substrate for defining equivalences of categorical cospans in a future PR: such an equivalence will be a structure extending a `CatCospanAdjunction` with isomorphisms data on the unit and co-unit (we will however provide alternative constructors in sync with the constructor for equivalences of categories). --- - [x] depends on: #26447 - [x] depends on: #26547 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory large-import	205/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	229-64318 7 months ago	321-73490 321 days ago	0-625 10 minutes
23621	astrainfinita author:astrainfinita	chore: deprecate `LinearOrderedComm{Monoid, Group}WithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #20676	merge-conflict t-algebra t-order label:t-algebra$	261/205	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValExtension.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	44	24	['YaelDillies', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	226-46033 7 months ago	397-18406 397 days ago	5-42380 5 days
27990	kckennylau author:kckennylau	feat(Counterexamples): a nontrivial valuation with discrete topology	This file constructs a valuation on `K[X]` satisfying `IsValuativeTopology K[X] ∧ Nonempty (valuation K[X]).RankOne ∧ IsNontrivial K[X] ∧ DiscreteTopology K[X]`, and proves that `IsValuativeTopology F ∧ IsNontrivial F ∧ DiscreteTopology F` is not possible if `F` is a field. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	172/0	Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean	2	14	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	218-48164 7 months ago	218-48165 218 days ago	67-79609 67 days
28132	dupuisf author:dupuisf	feat: preliminary `grind` tags for `IsUnit`	This PR adds preliminary `grind` tags for the `IsUnit` predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	61/17	Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Ring/Units.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean	6	3	['github-actions', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	195-24762 6 months ago	195-24763 195 days ago	80-71575 80 days
26827	pechersky author:pechersky	feat(Analysis/Normed/ValuativeRel): helper instance for NormedField	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26713 - [x] depends on: #26826	merge-conflict t-algebra t-number-theory t-analysis label:t-algebra$	211/27	Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	34	['ADedecker', 'adamtopaz', 'erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	kbuzzard assignee:kbuzzard	187-53366 6 months ago	187-53366 187 days ago	122-64394 122 days
22662	plp127 author:plp127	feat: Localization.Away.lift (computably)	This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	18	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	kim-em assignee:kim-em	180-76025 5 months ago	180-76026 180 days ago	257-28368 257 days
24850	pechersky author:pechersky	feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra	Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111	merge-conflict t-topology	509/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	9	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	urkud assignee:urkud	180-75853 5 months ago	180-75854 180 days ago	177-43034 177 days
26914	quangvdao author:quangvdao	feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor`	This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence. We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute Some things I'm not clear on: - I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level? - Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation. - Need a double-check on the priority of notation. Some future definitions to add: - Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`. - Definitions of Lenses and Charts (each of them will be a file or even a folder) - Exponential objects (corresponding to both `prod` and `tensor`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	20	['alexkeizer', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao']	eric-wieser assignee:eric-wieser	180-75331 5 months ago	180-75332 180 days ago	133-23955 133 days
28125	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics): basic definition of simplicial complexes	This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions.	merge-conflict t-combinatorics new-contributor	374/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-75026 5 months ago	180-75027 180 days ago	99-64548 99 days
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	6	['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	180-74873 5 months ago	180-74874 180 days ago	55-54919 55 days
29526	llllvvuu author:llllvvuu	feat: `Multiset.map f` identifies `f` up to permutation	Motivation: Reason about `Fintype`-indexed families via `Multiset` equality. Example use case 1: ```lean theorem Matrix.IsHermitian.cfc_eigenvalues {d : Type} [Fintype d] [DecidableEq d] {M : Matrix d d 𝕜} (hM : M.IsHermitian) (f : ℝ → ℝ) (hcfc : Matrix.IsHermitian (cfc f M) := cfc_predicate f M) : ∃ (e : d ≃ d), hcfc.eigenvalues = f ∘ hM.eigenvalues ∘ e := by have := hcfc.roots_charpoly_eq_eigenvalues.symm rw [hM.charpoly_cfc_eq f, Polynomial.roots_prod] at this; swap · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this have he := (Multiset.compTriple_equivOfMapUnivEq this).comp_eq simp_rw [← Function.comp_def RCLike.ofReal, ← Function.comp_def f, Function.comp_assoc] at he exact ⟨_, RCLike.ofReal_injective.comp_left he.symm⟩ ``` Example use case 2 (on top of https://github.com/leanprover-community/mathlib4/pull/29610): ```lean theorem LinearMap.Eigenbasis.μ_equiv {ι ι' R G : Type} [Fintype ι] [Fintype ι'] [CommRing R] [IsDomain R] [AddCommGroup G] [Module R G] [Module.Free R G] [Module.Finite R G] {f : Module.End R G} (B₁ : f.Eigenbasis ι) (B₂ : f.Eigenbasis ι') : ∃ e : ι ≃ ι', B₁.μ = B₂.μ ∘ e := by classical have := congr(Polynomial.roots $(B₁.charpoly_eq.symm.trans B₂.charpoly_eq)) rw [Polynomial.roots_prod, Polynomial.roots_prod] at this; rotate_left · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this exact ⟨Multiset.equivOfMapUnivEq this, (Multiset.compTriple_equivOfMapUnivEq this).comp_eq.symm⟩ ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	9	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele']	pechersky assignee:pechersky	180-74835 5 months ago	180-74836 180 days ago	69-23034 69 days
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-74239 5 months ago	180-74240 180 days ago	54-82760 54 days
31356	adomani author:adomani	feat: add inspect-like functions	Produces a tree-like formatting for `Syntax`, `Expr` and `InfoTree`. Especially for the `InfoTree`s, there are many parts of it that do not get printed. For instance, this is how the `InfoTree`s of `set_option linter.missingDocs true` get printed: ```lean inspectIT set_option linter.missingDocs true /- commandCtx \|-Info.ofCommandInfo: Lean.Elab.Command.elabSetOption, 'set_option…gDocs true' \| \|-Info.ofCompletionInfo.CompletionInfo.option 'set_option…issingDocs' \| \|-Info.ofOptionInfo: linter.missingDocs, Linter.linter.missingDocs -/ ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	720/0	Mathlib.lean,Mathlib/Util/Inspect.lean,MathlibTest/Inspect.lean	3	3	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	kim-em assignee:kim-em	180-69260 5 months ago	180-69261 180 days ago	11-61697 11 days
6993	jjaassoonn author:jjaassoonn	feat: lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48184 5 months ago	850-52937 850 days ago	103-330 103 days
9339	FMLJohn author:FMLJohn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	402/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	8	11	['FMLJohn', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48137 5 months ago	864-53115 864 days ago	6-63597 6 days
10349	Shamrock-Frost author:Shamrock-Frost	refactor(CategoryTheory/MorphismProperty): some clean-ups	We make explicit some of the galois connections/closure operators in the existing MorphismProperty file, rewrite some proofs to take advantage of these structures, and change map/inverseImage by (1) swapping their argument order, for consistency with Set.range and Set.preimage and (2) making "map" perform the strict, evil map while "essMap" (previously called map) forms the closure of the image under isomorphisms. Finally we add `IsMultiplicative` instances for isos/epis/monos, with an eye towards constructing the wide subcategory on these classes of maps. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	474/318	Mathlib/CategoryTheory/Localization/Composition.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/MorphismProperty.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Closure.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/RelIso/Basic.lean	8	1	['leanprover-community-mathlib4-bot']	nobody	180-48095 5 months ago	831-16839 831 days ago	0-418 6 minutes
26890	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): more API for `DayFunctor`	We provide some lemmas that helps characterizing the monoidal structure on `DayFunctor`, they are special cases of the lemmas for `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-47487 5 months ago	314-72496 314 days ago	0-517 8 minutes
24016	plp127 author:plp127	feat: fine uniformity	Adds the fine uniformity, and proves some properties. --- - [ ] depends on: #24096 for showing the induced topology is equal on completely regular spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	283/0	Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	175-7854 5 months ago	397-16604 397 days ago	2-85308 2 days
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	merge-conflict t-algebra label:t-algebra$	67/66	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	26	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'leanprover-bot', 'leanprover-radar', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	154-20638 5 months ago	175-56587 175 days ago	63-23787 63 days
33434	astrainfinita author:astrainfinita	chore: redefine `Finsupp.indicator` using `Finsupp.onFinset`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	6/17	Mathlib/Data/Finsupp/Indicator.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	131-53577 4 months ago	39-30733 39 days ago	5-35275 5 days
33126	CoolRmal author:CoolRmal	feat: function composition preserves boundedness	This PR adds the following theorem: if the range of a function `g` is bounded above, then `g ∘ f` is bounded above for all functions `f`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	12/0	Mathlib/Order/Bounds/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	122-51490 4 months ago	122-51491 122 days ago	27-6197 27 days
29587	uniwuni author:uniwuni	feat(GroupTheory/Finiteness): define finitely generated semigroups	We define finitely generated semigroups and basics similarly to monoids and groups and prove that semigroups and monoids remain finitely generated when a congruence is quotiented out. This will be important when further developing semigroup theory. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-group-theory	259/14	Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/GroupTheory/Finiteness.lean	2	4	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'uniwuni']	dupuisf assignee:dupuisf	120-63059 4 months ago	222-67963 222 days ago	25-78230 25 days
29014	ShreckYe author:ShreckYe	feat(Data/List/Scan): some theorems that relate `scanl` with `foldl`	I am not sure which is the best form of `getElem_scanl_eq_foldl_take` here, so I added several alternative forms. Feel free to remove any of them if necessary.	merge-conflict t-data	35/0	Mathlib/Data/List/Scan.lean	1	15	['ShreckYe', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	pechersky assignee:pechersky	116-42283 3 months ago	190-7328 190 days ago	74-59834 74 days
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	29	['MrBrain295', 'Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	108-4858 3 months ago	318-3082 318 days ago	72-49525 72 days
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [x] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	516/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt	7	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	98-68712 3 months ago	318-5553 318 days ago	52-59768 52 days
34931	eric-wieser author:eric-wieser	perf: make TensorProduct.lift irreducible with a unification hint	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	6/2	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	7	['eric-wieser', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	erdOne assignee:erdOne	95-36732 3 months ago	95-36733 95 days ago	5-66655 5 days
33020	FormulaRabbit81 author:FormulaRabbit81	chore(Topology): Deprecate file	--- - [x] depends on: #30851 deprecation [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import merge-conflict	82/49	Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/PiNat.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	93-13343 3 months ago	152-732 152 days ago	0-14835 4 hours
33281	michelsol author:michelsol	feat(Analysis/SpecialFunctions/Integrals): integral of 1/sqrt(1-x^2) and its integrability.	Add the integral of the derivative of arcsin and its integrability. --- - [ ] depends on: #33280 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict t-analysis	59/0	Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	92-68537 3 months ago	144-36362 144 days ago	0-2872 47 minutes
34156	zcyemi author:zcyemi	feat(Analysis/Convex/Between): add lemmas on convex combination of mem simplex interior	--- I add three lemmas of convex combinations preserving membership in the interior of a simplex. And also open a zulip thread [#mathlib4 > Best place for convex combination and simplex interior](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Best.20place.20for.20convex.20combination.20and.20simplex.20interior/with/568558406) deps: - [ ] depends on: #33852	t-analysis merge-conflict	170/0	Mathlib/Analysis/Convex/Between.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	92-44454 3 months ago	92-44454 92 days ago	0-3761 1 hour
32918	michelsol author:michelsol	feat: define `supEdist` and `supDist`	Create a new file Topology.MetricSpace.SupDistance and define the supremal distance in (extended) metric spaces. The defined `supEdist` and `supDist` will have similar theory to the already existing `infEdist` and `infDist`. The motivation is to be able to define the radius of a minimal bounding sphere as the infimum of the supDist later. [zulip discussion here](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Jung's.20theorem.20and.20minimal.20bounding.20spheres)	t-topology new-contributor merge-conflict	75/0	Mathlib.lean,Mathlib/Topology/MetricSpace/SupDistance.lean	2	5	['github-actions', 'mathlib4-merge-conflict-bot', 'michelsol', 'urkud']	nobody	91-38636 3 months ago	133-31021 133 days ago	21-3598 21 days
25980	Multramate author:Multramate	refactor(Algebra/Group/Submonoid/Operations): rename restrict to domRestrict and add restrict	And update the documentation for consistency	t-group-theory merge-conflict	145/123	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Maps.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	14	10	['Multramate', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts']	nobody	90-18582 3 months ago	90-18583 90 days ago	5-9216 5 days
25981	Multramate author:Multramate	feat(GroupTheory/GroupAction/Basic): define homomorphisms of fixed subgroups induced by homomorphisms of groups	This PR continues the work from #10126. Original PR: https://github.com/leanprover-community/mathlib4/pull/10126	t-group-theory large-import merge-conflict	218/144	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Maps.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	16	8	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts']	nobody	90-18581 3 months ago	90-18581 90 days ago	4-78395 4 days
33795	alreadydone author:alreadydone	feat(Topology/Sheaves): LocalPredicate prerequisite for étalé spaces	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	418/143	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	6	12	['adamtopaz', 'alreadydone', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	adamtopaz assignee:adamtopaz	89-82615 3 months ago	89-82616 89 days ago	34-21636 34 days
34674	Citronhat author:Citronhat	feat(Algebra/Order/Ring): replace ENNReal lemmas with WithTop versions	* Add `WithTop` versions of basic multiplicative order lemmas. * Use the new `WithTop` lemmas to replace `ENNReal` proofs and address six TODOs. * Fix a typo in the `pos_of_ne_zero` alias name.	new-contributor t-algebra merge-conflict label:t-algebra$	46/15	Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Data/ENNReal/Operations.lean	3	5	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	Ruben-VandeVelde assignee:Ruben-VandeVelde	89-62485 3 months ago	89-62486 89 days ago	17-1225 17 days
33746	ster-oc author:ster-oc	feat(Algebra/Module/ZLattice): align `ZSpan.floor` to `Int.floor` API	This PR adds some of the existent lemmas about `Int.floor`, `Int.ceil` and `Int.fract` to the `ZSpan` namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor merge-conflict label:t-algebra$	353/145	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Topology/Algebra/Order/Floor.lean	3	8	['github-actions', 'joelriou', 'mathlib-merge-conflicts', 'ster-oc']	joelriou assignee:joelriou	84-79383 2 months ago	84-79383 84 days ago	30-23357 30 days
31595	astrainfinita author:astrainfinita	chore: redefine `Ideal.IsPrime`	Redefine `Ideal.IsPrime` to make it correct for non-commutative cases --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	333/100	Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Noetherian.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IsPrimary.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/Ideal.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Valuation/Basic.lean	22	33	['alreadydone', 'artie2000', 'astrainfinita', 'erdOne', 'github-actions', 'leanprover-bot', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	82-2545 2 months ago	50-85601 50 days ago	59-66521 59 days
33791	PhoenixIra author:PhoenixIra	feat: Generalization of FixedPointApproximants to CompletePartialOrder	--- This PR provides a generalization of FixedPointApproximants to CompletePartialOrder. Not every theorem can be generalized, as sometimes we require additional conditions (namely `x ≤ f x`) in order to guarantee that the set is directed and thus the supremum is well-defined. This is not necessary in a CompleteLattice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	223/100	Mathlib/Order/CompletePartialOrder.lean,Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean	2	21	['PhoenixIra', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	PhoenixIra and vihdzp assignee:PhoenixIra assignee:vihdzp	80-29717 2 months ago	80-29717 80 days ago	44-16098 44 days
26942	pechersky author:pechersky	feat(RingTheory/Valuation/ValueGroupIso): isomorphism of value groups when compatible	and also to the ValuativeRel's value group by request from comment in https://github.com/leanprover-community/mathlib4/pull/26754#issuecomment-3051770901 - [ ] depends on: #26588 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26939 - [x] depends on: #26940 - [x] depends on: #26941	merge-conflict t-ring-theory t-order	299/3	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/RingTheory/Valuation/ValueGroupIso.lean	6	10	['faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'pechersky']	faenuccio assignee:faenuccio	77-60298 2 months ago	277-45708 277 days ago	10-67838 10 days
14712	astrainfinita author:astrainfinita	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	49/20	Mathlib/Algebra/Group/Nat.lean,Mathlib/Algebra/Group/ZeroOne.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/UInt.lean,Mathlib/NumberTheory/ArithmeticFunction.lean	9	26	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	73-59403 2 months ago	648-37573 648 days ago	20-15089 20 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	26	['PatrickMassot', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	73-59391 2 months ago	333-59130 333 days ago	91-68302 91 days
35215	kim-em author:kim-em	chore: use @[to_dual] in FixedPoints	This PR adds `@[to_dual]` annotations to 14 theorems about `lfp` in `Order/FixedPoints.lean`, auto-generating their `gfp` duals and deleting the hand-written versions. Also registers `OrderHom.lfp` as the dual of `OrderHom.gfp` via `attribute [to_dual existing]`. Auto-generated duals include: `le_gfp`, `gfp_le_fixed`, `gfp_le`, `gfp_le_map`, `map_gfp`, `isFixedPt_gfp`, `map_le_gfp`, `isGreatest_gfp_le`, `isGreatest_gfp`, `gfp_induction`, `map_gfp_comp`, `gfp_gfp`, `map_inf_fixedPoints_le`, `map_sInf_subset_fixedPoints_le`. [Diff relative to #35208](https://github.com/kim-em/mathlib4/compare/kim/to-dual-bounds-basic...kim/to-dual-fixed-points) - [x] depends on: #35208 🤖 Prepared with Claude Code	LLM-generated merge-conflict	249/548	Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Order.lean	8	11	['JovanGerb', 'github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	alexjbest assignee:alexjbest	72-13666 2 months ago	59-43067 59 days ago	24-14816 24 days
36165	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.strongRec(On)'`	In favour of Batteries's `Nat.strongRec` for definitions and `Nat.strong_induction_on` for proofs.	t-data merge-conflict	34/66	Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	8	6	['JovanGerb', 'MichaelStollBayreuth', 'Parcly-Taxel', 'Vierkantor', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	71-57997 2 months ago	59-43057 59 days ago	15-53464 15 days
35042	JovanGerb author:JovanGerb	chore: remove `meta` form `import Mathlib.Tactic...`	This PR cleans up some imports of the form `import Mathlib.Tactic...`, by either removing them entirely, or removing the `meta` keyword. It should never be necessary to `meta import` a file from `Mathlib.Tactic`, because the relevant definitions should already have been marked as `meta`. The motivation is to reduce the amount of files that are `meta` imported when writing e.g. `import Mathlib`, hence reducing the amount of stuff that needs to be loaded. There are more other `meta import`s that need to be removed, but this PR is a good start. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	61/142	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/Data/List/ChainOfFn.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/ApplyFun.lean,Mathlib/Tactic/ArithMult.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CategoryTheory/Coherence/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Elementwise.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,Mathlib/Tactic/Choose.lean,Mathlib/Tactic/DeclarationNames.lean,Mathlib/Tactic/DefEqTransformations.lean,Mathlib/Tactic/DeriveCountable.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/DeriveTraversable.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Tactic/Explode.lean,Mathlib/Tactic/Explode/Pretty.lean,Mathlib/Tactic/FinCases.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRewrite/Elab.lean,Mathlib/Tactic/Group.lean,Mathlib/Tactic/IrreducibleDef.lean,Mathlib/Tactic/Lift.lean,Mathlib/Tactic/Linarith.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Gauss.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Tactic/Linarith/Verification.lean,Mathlib/Tactic/LinearCombination/Lemmas.lean,Mathlib/Tactic/Linter/DeprecatedSyntaxLinter.lean,Mathlib/Tactic/Linter/DocPrime.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/Linter/EmptyLine.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Linter/GlobalAttributeIn.lean,Mathlib/Tactic/Linter/HashCommandLinter.lean,Mathlib/Tactic/Linter/Multigoal.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/TextBased/UnicodeLinter.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Nontriviality/Core.lean,Mathlib/Tactic/NormNum/DivMod.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Tarjan.lean,Mathlib/Tactic/PNatToNat.lean,Mathlib/Tactic/Peel.lean,Mathlib/Tactic/ProdAssoc.lean,Mathlib/Tactic/ProxyType.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Qify.lean,Mathlib/Tactic/RSuffices.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Common.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/PNat.lean,Mathlib/Tactic/Simproc/Divisors.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Subsingleton.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TautoSet.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Translate/TagUnfoldBoundary.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CommDiag.lean,Mathlib/Tactic/Widget/CongrM.lean	107	9	['JovanGerb', 'dupuisf', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	robin-carlier assignee:robin-carlier	68-49347 2 months ago	63-72640 63 days ago	26-69911 26 days
36495	AlexKontorovich author:AlexKontorovich	chore(Finset/NatDivisors): refactor `card_divisors_mul` and `sum_divisors_mul` to not rely on `ArithmeticFunction`	`Nat.Coprime.card_divisors_mul` and `Nat.Coprime.sum_divisors_mul` are moved to not rely on `ArithmeticFunction`. See zulip discussion here: [#mathlib4 > Library design question, e.g.`Nat.Coprime.card_divisors_mul` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Library.20design.20question.2C.20e.2Eg.2E.60Nat.2ECoprime.2Ecard_divisors_mul.60/near/577769899) Co-authored-by: Ziyan Wei and Aayush Rajasekaran --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory t-algebra merge-conflict label:t-algebra$	45/14	Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Data/Finset/NatDivisors.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean	3	6	['AlexKontorovich', 'arajasek', 'github-actions', 'mathlib-merge-conflicts']	riccardobrasca assignee:riccardobrasca	68-32864 2 months ago	10-29228 10 days ago	53-21240 53 days
27534	PierreQuinton author:PierreQuinton	feat: a typeclass for `sSup`/`sInf` to be lawful	Adds lawful infima and suprema type classes. A preorder with lawful suprema: whenever a set has a least upper bound, `sSup` returns a least upper bound for that set. A preorder with lawful infima: whenever a set has a greatest lower bound, `sInf` returns a greastest lower bound for that set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	26	['PierreQuinton', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	65-44094 2 months ago	180-75169 180 days ago	114-37921 114 days
37530	mcdoll author:mcdoll	fix(Topology/Algebra): fix bad simps and make arguments implicit for `PointwiseConvergenceCLM`	We delete all `simps` calls in the definitions of operators on `PointwiseConvergenceCLM` and replace them with `apply_apply` lemmas that do not abuse the defeq between `SLₚₜ` and `SL`. This made the linter discover some typeclass duplications, which we remove by restructuring the file. As a consequence of the new `simp` lemmas, we can remove all `set_option backward.isDefEq.respectTransparency false in` in `Analysis.Distribution.TemperedDistribution`. Moreover, we make several arguments implicit, which can be inferred in almost all practical situations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	not-ready-to-merge merge-conflict	88/69	Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Topology/Algebra/Module/Spaces/PointwiseConvergenceCLM.lean	2	5	['github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mcdoll']	nobody	29-79337 29 days ago	29-79338 29 days ago	14-59669 14 days
37593	IlPreteRosso author:IlPreteRosso	refactor(Data.Finset.Antidiagonal): rename set-based defs to `setAntidiagonal`	Renames set-based `Finset.mulAntidiagonal` → `setMulAntidiagonal` (and SMul/VAdd variants) to free the `mulAntidiagonal` name for the planned `HasMulAntidiagonal` typeclass. Deprecation aliases added. Supersedes #34551	t-ring-theory new-contributor merge-conflict	178/96	Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	3	['github-actions', 'mathlib-merge-conflicts']	nobody	29-79336 29 days ago	29-79337 29 days ago	15-61521 15 days
37444	vihdzp author:vihdzp	feat: typeclass for zero-dimensional spaces	--- - [ ] depends on: #37317 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import merge-conflict	151/110	Mathlib/Topology/Algebra/ClopenNhdofOne.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,Mathlib/Topology/Category/Profinite/Basic.lean,Mathlib/Topology/Category/Profinite/CofilteredLimit.lean,Mathlib/Topology/Category/Stonean/Basic.lean,Mathlib/Topology/ClopenBox.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/WithTop.lean,Mathlib/Topology/Separation/CompletelyRegular.lean,Mathlib/Topology/Separation/DisjointCover.lean,Mathlib/Topology/Separation/Lemmas.lean,Mathlib/Topology/Separation/Profinite.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean	13	17	['ADedecker', 'FernandoChu', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	27-58620 27 days ago	27-59692 27 days ago	0-5306 1 hour
38239	vihdzp author:vihdzp	chore(Order/SuccPred/Limit): reorganize sections	In an effort to keep the file better organized, we move theorems which use `SuccOrder`/`PredOrder` as an assumption to a new section. No theorems have been changed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	95/110	Mathlib/Order/SuccPred/Limit.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	27-22514 27 days ago	27-22515 27 days ago	2-48556 2 days
37461	grunweg author:grunweg	chore: golf using the field tactic	--- In the spirit of #31314. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	32/43	Counterexamples/NowhereDifferentiable.lean,Mathlib/Analysis/Calculus/Monotone.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Integral/MeanValue.lean,Mathlib/NumberTheory/ModularForms/Discriminant.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/MDifferentiable.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/Distributions/Gaussian/CharFun.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/PowerSeries/Exp.lean,Mathlib/Topology/UnitInterval.lean	20	5	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	25-22218 25 days ago	25-22219 25 days ago	22-59925 22 days
37774	weisbrja author:weisbrja	fix: change variables in `bicompl` to `Sort*` and add missing theorem mentioned in `bicompl` docs	[#mathlib4 > Why does Mathlib use Type* instead of Sort* in some places?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Why.20does.20Mathlib.20use.20Type.2A.20instead.20of.20Sort.2A.20in.20some.20places.3F/with/583882342) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict	6/1	Mathlib/Logic/Function/Basic.lean	1	8	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'weisbrja']	nobody	21-35846 21 days ago	21-35847 21 days ago	19-76858 19 days
36740	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `AlgebraicGeometry.Scheme.isBasis_affineOpens`: unchanged 🎉 * `SimpleGraph.Walk.takeUntil_eq_take`: 263 ms before, 180 ms after 🎉 * `SimpleGraph.Walk.dropUntil_eq_drop`: 382 ms before, 261 ms after 🎉 * `Int.image_Ico_emod`: unchanged 🎉 * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	8	['artie2000', 'chenson2018', 'github-actions', 'mathlib-merge-conflicts']	nobody	19-25309 19 days ago	19-25310 19 days ago	43-5868 43 days
37603	Parcly-Taxel author:Parcly-Taxel	refactor: review of `SetSemiring`	* Rename `Set.up` and `SetSemiring.down` to `SetSemiring.ofSet` and `SetSemiring.toSet` respectively. Unprotect both and make them equivalences, following `FreeMonoid`. * Derive `CompleteAtomicBooleanAlgebra` for `SetSemiring` immediately. * Add `imageHom_id` and `imageHom_comp`. The three existing lemmas about `imageHom` are coalesced into `imageHom_apply`. Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568.	maintainer-merge merge-conflict	120/165	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean	2	42	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel']	nobody	19-16699 19 days ago	19-16700 19 days ago	22-62470 22 days
38329	jcommelin author:jcommelin	chore: tighten down public/exposed API of AlgebraicClosure	This PR tightens down the API of AlgebraicClosure, by making few parts of FieldTheory/IsAlgClosed/AlgebraicClosure.lean public and/or exposed. We still need to expose the main definition. It would be great if we can unexpose it in the future. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	73/53	Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/FieldTheory/Differential/Liouville.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Norm/Transitivity.lean,Mathlib/RingTheory/Trace/Basic.lean	9	26	['eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'plp127', 'riccardobrasca']	nobody	19-16682 19 days ago	19-16683 19 days ago	7-41851 7 days
37819	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): add `OmegaCompletePartialOrder` instance for `WithBot` with basic `ωScottContinuous` lemmas	This is a modification of #34093. See #34093 for details. --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	337/10	Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot.lean	6	5	['Komyyy', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	17-86307 17 days ago	17-86307 17 days ago	22-11204 22 days
37053	artie2000 author:artie2000	refactor(Analysis/Convex/Cone): use `PointedCone` in Riesz extension theorem	Change the statement of the Riesz extension theorem to take a `PointedCone` rather than a `ConvexCone`. This PR is part of a series replacing `ConvexCone` with `PointedCone`. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/near/581184307 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge merge-conflict	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	9	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash']	nobody	7-24912 7 days ago	7-24913 7 days ago	46-71615 46 days
35217	kim-em author:kim-em	feat: auxiliary lemmas for Artin and braid groups	This PR adds small lemmas to existing files, in preparation for the Artin groups and braid groups PRs. - `Commute.mul_pow_eq_one`: for commuting elements with `a ^ m = 1` and `b ^ m = 1` - `Equiv.Perm.swap_conjugate`: braid relation for adjacent transpositions - `Equiv.Perm.swap_mul_swap_comm_of_disjoint`: disjoint transpositions commute - `@[grind =]` attributes on `Perm.mul_apply`, `Perm.one_apply`; new `Perm.pow_add_one_apply` - `Subgroup.normalClosure_singleton_one` - `FreeGroup.ofList` and associated lemmas - `FreeGroup.freeGroupUnitMulEquivInt` - `PresentedGroup.instUniqueOfIsEmpty` - `CoxeterMatrix.Aₙ_adjacent`, `CoxeterMatrix.Aₙ_far` 🤖 Prepared with Claude Code	t-group-theory LLM-generated merge-conflict	97/2	Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	7	16	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'themathqueen']	thorimur assignee:thorimur	5-16699 5 days ago	5-16699 5 days ago	20-78468 20 days
37553	grunweg author:grunweg	chore: golf using .ne and friends	ne_of_gt -> .ne' ne_of_lt -> .ne le_of_lt -> .le Drive-by golfs using gcongr and positivity and been split into separate PRs. --- - [x] depends on: #37462 - [x] depends on: #37715 - [x] depends on: #37554 - [x] depends on: #37845 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	302/321	Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/NowhereDifferentiable.lean,Counterexamples/TopologistsSineCurve.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/DerivativeTest.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/Poisson.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/Caratheodory.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinInversion.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Field/Approximation.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/Normed/Unbundled/IsPowMulFaithful.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/Interval.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Log.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Real/ConjExponents.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean	114	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16198 5 days ago	5-16198 5 days ago	13-66876 13 days
39229	grunweg author:grunweg	dev: towards `fun_prop` on manifolds	--- - [ ] depends on: #39226 Rebased version of #31580. Meant to be a prototype that demonstrate how this could possibly work. Not functional yet; waiting on cache to continue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	305/1	Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Tactic/FunProp/Core.lean,MathlibTest/DifferentialGeometry/FunPropM.lean,MathlibTest/fun_prop_dev.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-83488 2 days ago	7-10660 7 days ago	0-12 12 seconds
38409	chrisflav author:chrisflav	feat(RingTheory): totally split algebras over a field	We show that for a totally split algebra over a field, the `k`-rational points are in bijection with the prime spectrum. We also show that an étale algebra over a separably closed field is totally split. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	122/2	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/TotallySplit.lean	6	2	['github-actions', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	1-18567 1 day ago	1-18568 1 day ago	24-42941 24 days
38830	Jun2M author:Jun2M	feat(Data/List): Nodup and head & getLast lemmas	Given a Nodup list: * If a prefix contains the last element, they are equal * If a suffix contains the first element, they are equal * If an infix contains the first element, it is a prefix * If an infix contains the last element, it is a suffix * If the first and the last element are the same, it is a singleton * `countP` is cardinality of the filter of `toFinset`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	29/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/List/Nodup.lean	2	7	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts']	nobody	1-18443 1 day ago	1-18444 1 day ago	15-71211 15 days
39287	xgenereux author:xgenereux	feat(Localization/AtPrime/Basic): upgrade `equivQuotMaximalIdeal` to an AlgEquiv	The definition [IsLocalization.AtPrime.equivQuotMaximalIdealPow](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Localization/AtPrime/Basic.html#IsLocalization.AtPrime.equivQuotMaximalIdealPow) was added in #36783. The case with `n = 1` is still important and interesting. I have upgraded it to an AlgEquiv using `equivQuotMaximalIdealPow`. This did break a few small things, because we need to bridge back to a `RingEquiv` in some places. I took the liberty to add some missing `apply` lemmas to ease fixing these proofs. Disclaimer: I used Claude to suggest the first shot and refined it from there. María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	45/68	Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean	3	2	['github-actions', 'mathlib-merge-conflicts', 'wwylele']	nobody	1-18311 1 day ago	1-18312 1 day ago	4-53165 4 days
39329	lecopivo author:lecopivo	feat(fun_prop): eager application of transition theorems for fun_prop	For properties like Integrable we want to apply transition theorems(like Continuous -> Integrable) eagerly --- This is a change necessary in preparation for making `fun_prop` work for integrability. --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	93/30	Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,MathlibTest/FunPropMinimal.lean	4	14	['b-mehta', 'github-actions', 'lecopivo', 'mathlib-merge-conflicts']	JovanGerb assignee:JovanGerb	0-43906 12 hours ago	2-57854 2 days ago	1-47071 1 day
37584	kennethgoodman author:kennethgoodman	feat(Data/Nat/Fib): formalize Lamé's theorem	## Summary Formalize [Lamé's theorem](https://en.wikipedia.org/wiki/Lam%C3%A9%27s_theorem) (1844), the founding result of computational complexity theory. Lamé's Theorem: If the Euclidean algorithm on inputs `(a, b)` with `b ≤ a` takes `n + 1` division steps, then `b ≥ fib(n + 1)` and `a ≥ fib(n + 2)`. ### New definitions - `Nat.euclidSteps`: counts the number of division steps in the Euclidean algorithm on natural number inputs. ### New theorems - `Nat.fib_le_of_euclidSteps`: the main Lamé bound — Fibonacci lower bound on inputs given a step count. - `Nat.euclidSteps_le_of_lt_fib`: the contrapositive — step count upper bound given a Fibonacci bound on the smaller input. - `Nat.add_mod_le`: helper lemma that `b + a % b ≤ a` when `b ≤ a` and `0 < b`. ### Proof strategy Induction on `n`, tracking both elements of the pair. The key insight is that each Euclidean step replaces `(a, b)` with `(b, a % b)`, and since `a ≥ b + a % b` (because `a / b ≥ 1`), the Fibonacci recurrence `fib(n+3) = fib(n+2) + fib(n+1)` matches the structure of the algorithm. ### References - Gabriel Lamé, Note sur la limite du nombre des divisions dans la recherche du plus grand commun diviseur entre deux nombres entiers, Comptes rendus de l'Académie des sciences, 1844. --- ### AI usage disclosure Per the [Mathlib AI guidelines](https://leanprover-community.github.io/contribute/index.html#use-of-ai): Claude Code (Claude Opus 4.6) was used to assist with writing the Lean 4 proof code, fixing tactic errors, and drafting this PR description. The mathematical proof (induction on step count, tracking both pair elements through the Fibonacci recurrence) was designed by hand and verified on paper before formalization. I have reviewed and understand every line of the resulting Lean code and can explain all proof steps. --- - [x] builds cleanly (`lake build Mathlib.Data.Nat.Fib.Lame`) - [x] no `sorry` - [x] lines ≤ 100 characters, no trailing whitespace - [x] `autoImplicit false` - [x] docstrings on all public declarations	new-contributor LLM-generated t-data merge-conflict	121/0	Mathlib.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Fib/Lame.lean,docs/1000.yaml	5	25	['euprunin', 'github-actions', 'kennethgoodman', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele']	TwoFX assignee:TwoFX	0-32579 9 hours ago	0-32580 9 hours ago	44-66371 44 days

Stale new contributor PRs

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	641-66423 1 year ago	672-27005 672 days ago	6-38745 6 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	637-51332 1 year ago	672-57554 672 days ago	56-40668 56 days
14669	Command-Master author:Command-Master	feat(Data/Nat/PartENat): add lemmas for PartENat	Add some missing lemmas for `PartENat`, as well as the additive homomorphism from it to `WithTop Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor merge-conflict	90/0	Mathlib/Data/Nat/PartENat.lean	1	4	['erdOne', 'github-actions', 'mathlib-merge-conflicts', 'urkud']	nobody	624-63222 1 year ago	675-70744 675 days ago	0-6775 1 hour
15121	Eloitor author:Eloitor	feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-category-theory new-contributor	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	624-26167 1 year ago	655-71826 655 days ago	7-3203 7 days
14242	js2357 author:js2357	feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr`	Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`. Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib. - [x] depends on: #14099 - [x] depends on: #14216 - [ ] depends on: #14237 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	269/1	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	601-37226 1 year ago	689-26173 689 days ago	0-273 4 minutes
16887	metinersin author:metinersin	feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas	Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`. --- - [ ] depends on: #16885 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61278 608 days ago	0-1299 21 minutes
16888	metinersin author:metinersin	feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms	Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`. --- - [ ] depends on: #16887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61279 608 days ago	0-1045 17 minutes
16889	metinersin author:metinersin	feat(ModelTheory/Complexity): Normal forms	Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively. --- - [ ] depends on: #16888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33203 1 year ago	608-57029 608 days ago	0-613 10 minutes
14619	Command-Master author:Command-Master	chore: Merge `Trunc` to `Squash`	Remove `Trunc` and use `Squash` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP new-contributor	197/211	Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Semiquot.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/List.lean	13	3	['Command-Master', 'github-actions', 'vihdzp']	nobody	583-79754 1 year ago	unknown	0-0 0 seconds
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-data new-contributor merge-conflict awaiting-author	226/0	Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean	5	5	['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	575-55861 1 year ago	724-37959 724 days ago	16-49744 16 days
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-order new-contributor label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	558-84137 1 year ago	558-84137 558 days ago	7-45599 7 days
16885	metinersin author:metinersin	feat(ModelTheory/Complexity): define literals	Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification. --- - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-logic	148/5	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	20	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	556-40258 1 year ago	592-29570 592 days ago	0-19926 5 hours
13248	hcWang942 author:hcWang942	feat: basic concepts of auction theory	## Description Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas. This is the very first PR of the project formalizing core concepts and results in auction theory. Our group is working on more contributions on the formalization of game theory prefix. Co-authored-by: Ma Jiajun ## Reference Roughgarden, Tim. *Twenty Lectures on Algorithmic Game Theory*. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B) --- - [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged ## Current plan for formalization of Game Theory The current plan for the formalizing of Game Theory include: #### 1. Auction Theory. 🎉 _(200+ lines, this PR)_ - Essential definitions of Sealed-bid auction, First-price auction and Second-price auction. - First-price auction has no dominant strategy. - Second-price auction has dominant strategy. (Second-price auction is DSIC) #### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard) - Mechanism design An allocation rule is implementable if there exists - Dominant Strategy Incentive Compatible (DSIC) payment rule - An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid - Myerson's Lemma Implementable ⇔ Monotone In the above case, the DSIC payment rule is unique. #### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard) - Equilibrium in zero sum game - Formalization strategy: via Loomis’s theorem. #### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard) #### 5. Brouwer fixed-point theorem. (Work in Progress) #### 6. More Mechanism design. (Planning)	merge-conflict awaiting-author new-contributor t-logic	204/0	Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib	3	148	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp']	hcWang942 assignee:hcWang942	551-79090 1 year ago	565-65278 565 days ago	109-82807 109 days
19125	yhtq author:yhtq	feat: add theorems to transfer `IsGalois` between pairs of fraction rings	feat: add theorems to transfer `IsGalois` between pairs of fraction rings. - [x] depends on: #18404 - [x] depends on: #19124 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra new-contributor label:t-algebra$	121/0	Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	522-15107 1 year ago	548-62889 548 days ago	0-1980 33 minutes
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	488-37119 1 year ago	581-28689 581 days ago	0-4704 1 hour
15711	znssong author:znssong	feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle	--- These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem. - [x] depends on: #15536 - [x] depends on: #16294	merge-conflict awaiting-author t-combinatorics new-contributor	407/3	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	22	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong']	nobody	487-56205 1 year ago	608-67366 608 days ago	9-13962 9 days
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	merge-conflict blocked-by-other-PR t-combinatorics new-contributor	903/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	8	3	['github-actions', 'grunweg']	nobody	487-56205 1 year ago	644-73559 644 days ago	0-1791 29 minutes
18629	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.merge	This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15450 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	487-22124 1 year ago	527-21737 527 days ago	33-11262 33 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	483-69704 1 year ago	483-69704 483 days ago	69-35596 69 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	482-43783 1 year ago	488-11184 488 days ago	29-51482 29 days
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-measure-probability new-contributor	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	475-61131 1 year ago	475-61131 475 days ago	27-43617 27 days
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import new-contributor merge-conflict awaiting-author t-topology	1189/813	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean	9	22	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	463-18441 1 year ago	469-69358 469 days ago	39-21495 39 days
19943	AlexLoitzl author:AlexLoitzl	feat(Computability): Add Chomsky Normal Form Grammar and translation	- Define Chomsky normal form grammars - Add language-preserving translation between context-free grammars and Chomsky normal form grammars Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	3151/0	Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean	8	59	['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak']	nobody	458-52540 1 year ago	465-64162 465 days ago	37-29014 37 days
21501	sksgurdldi author:sksgurdldi	feat(List): add sum_zipWith_eq_finset_sum	### Description: This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`. #### Statement: The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths. #### Formal Statement: ```lean lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ] {op : α → β → γ} (l : List α) (m : List β) : (List.zipWith op l m).sum = ∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!) ``` #### Remarks: - This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`. - It can be helpful in algebraic manipulations involving list-based summations. #### Dependencies: No additional dependencies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	453-21311 1 year ago	453-21311 453 days ago	13-33168 13 days
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology new-contributor	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	439-47152 1 year ago	439-47152 439 days ago	16-76141 16 days
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis new-contributor	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	431-42978 1 year ago	614-46207 614 days ago	29-48368 29 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data enhancement new-contributor merge-conflict awaiting-author	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	17	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	412-78377 1 year ago	438-20933 438 days ago	23-22681 23 days
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	t-measure-probability new-contributor merge-conflict awaiting-author t-analysis	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	407-73366 1 year ago	601-50737 601 days ago	51-85104 51 days
22308	plp127 author:plp127	feat (Analysis/Convex): Generalize `Convex` lemmas to `StarConvex`	This PR generalizes many lemmas assuming `Convex 𝕜 s` to assume `StarConvex 𝕜 0 s`. --- - [x] depends on: #22421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis new-contributor	30/18	Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean	4	5	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-59286 1 year ago	unknown	0-0 0 seconds
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory new-contributor	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	404-55554 1 year ago	404-55555 404 days ago	58-6026 58 days
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	403-58282 1 year ago	478-51042 478 days ago	5-5648 5 days
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis new-contributor	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	396-29480 1 year ago	479-40727 479 days ago	8-42257 8 days
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	396-25612 1 year ago	476-16585 476 days ago	13-56244 13 days
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory new-contributor label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	380-76451 1 year ago	unknown	0-0 0 seconds
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-computability merge-conflict awaiting-zulip	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	378-22730 1 year ago	647-45915 647 days ago	0-179 2 minutes
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-author new-contributor	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	372-68309 1 year ago	372-68309 372 days ago	27-52316 27 days
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import new-contributor	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	356-40650 11 months ago	356-40652 356 days ago	35-30364 35 days
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-algebra new-contributor merge-conflict awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	346-12603 11 months ago	729-40256 729 days ago	9-22045 9 days
20334	miguelmarco author:miguelmarco	feat: allow polyrith to use a local Singular/Sage install	Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-meta	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	339-5156 11 months ago	477-43137 477 days ago	27-61498 27 days
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry awaiting-zulip new-contributor	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	318-1917 10 months ago	350-63434 350 days ago	6-47693 6 days
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP t-category-theory new-contributor merge-conflict	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	291-60457 9 months ago	828-53383 828 days ago	7-63253 7 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	287-66648 9 months ago	318-1917 318 days ago	38-26044 38 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	286-68669 9 months ago	539-62262 539 days ago	20-16585 20 days
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import merge-conflict awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	3	['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	281-72210 9 months ago	482-47025 482 days ago	9-59130 9 days
20722	ctchou author:ctchou	feat(Counterexamples): the Vitali set is non-measurable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-measure-probability new-contributor merge-conflict awaiting-author	258/3	Counterexamples.lean,Counterexamples/VitaliSetNotMeasurable.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,docs/1000.yaml	4	76	['ctchou', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'vihdzp']	vihdzp assignee:vihdzp	275-61894 9 months ago	489-53864 489 days ago	0-47663 13 hours
28502	gilesgshaw author:gilesgshaw	feat(Logic/Basic): avoid unnecessary uses of choice	Certain proofs are modified to remove a dependence on the axoim of choice --- - [ ] depends on: #28623	blocked-by-other-PR new-contributor merge-conflict awaiting-author t-logic	83/74	Mathlib/Logic/Basic.lean	1	7	['Ruben-VandeVelde', 'eric-wieser', 'gilesgshaw', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	272-83706 8 months ago	275-69235 275 days ago	0-35689 9 hours
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ --- - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file) Here is a relevant TODO in Mathlib: https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48 I would appreciate your comments. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	750/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	5	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	270-33814 8 months ago	493-4373 493 days ago	43-22586 43 days
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	268-84795 8 months ago	291-60717 291 days ago	7-54661 7 days
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	268-46627 8 months ago	291-60718 291 days ago	7-62439 7 days
27479	iu-isgood author:iu-isgood	feat: Abel's Binomial Theorem	We have formalized Abel's Binomial Theorem as part of an REU project. There are a few remaining sorrys, but we will finish them soon. I will edit this PR message later according to community rules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	268-46388 8 months ago	297-44085 297 days ago	0-237 3 minutes
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	252-17756 8 months ago	252-48859 252 days ago	73-43082 73 days
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	merge-conflict t-logic new-contributor	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	251-52658 8 months ago	251-52659 251 days ago	10-61840 10 days
25778	thefundamentaltheor3m author:thefundamentaltheor3m	feat: Monotonicity of `setIntegral` for nonnegative functions	This PR makes it easier to prove monotonicity of the Bochner integral on sets for nonnegative functions by removing the stronger assumption required by the general monotonicity lemma that both of the functions being compared must be integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-measure-probability new-contributor	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	249-48380 8 months ago	340-56218 340 days ago	0-11893 3 hours
29588	Periecle author:Periecle	feat(Analysis/Complex/Residue): Implement residue theory for complex functions at isolated singularities	# Add basic residue theory for complex functions This PR introduces the residue theory implementation in mathlib. ## Main additions - `HasIsolatedSingularityAt f c`: Predicate for functions with isolated singularities at point `c` - `residue f c hf`: The residue of `f` at isolated singularity `c`, defined via circle integrals - Radius independence: `residue_eq_two_pi_I_inv_smul_circleIntegral` - residue equals normalized circle integral for any valid radius - Holomorphic residues: `residue_of_holomorphic` - functions holomorphic in a neighborhood have zero residue - Simple pole formula: `residue_simple_pole` - for `f(z) = (z-c)⁻¹ * g(z)`, residue equals `g(c)` ## Implementation notes - Builds on existing circle integral infrastructure in `CauchyIntegral.lean` - Uses `Classical.choose` to extract witness radius from isolated singularity condition - Comprehensive documentation with mathematical context and examples - Establishes foundation for residue theorem, argument principle, and other applications ## Examples included - `residue(1/z, 0) = 1` (canonical simple pole) - Radius independence demonstration - Zero residues for holomorphic functions This provides the essential building blocks for complex analysis and first step to formalize residue theory.	awaiting-author t-analysis new-contributor	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	236-51858 7 months ago	248-58240 248 days ago	0-976 16 minutes
26178	ppls-nd-prs author:ppls-nd-prs	feat(CategoryTheory/Limits): Fubini for products	We show that the product of products is a product indexed by the sigma type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	17/0	Mathlib/CategoryTheory/Limits/Shapes/Products.lean	1	6	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier']	nobody	231-66902 7 months ago	332-76302 332 days ago	0-47665 13 hours
28630	Antidite author:Antidite	feat(Archive/Imo): right isosceles configuration in the complex plane	feat(Archive/Imo): right isosceles configuration in the complex plane This adds `Archive/Imo/Imo1975Q3.lean`, formalizing a triangle configuration with points A=0, B=1, C=z and auxiliary points R, P, Q built via complex rotations and sine-based scale factors. Main results: * `angle_and_distance`: ∠QRP = π/2 and dist Q R = dist R P. * Key identity `QRP_rot90`: (Q z).z − R.z = e^{iπ/2} · ((P z).z − R.z). Design/Style: * Minimal imports; module docstring; semantic lemma names; all definitions and theorems live under the namespace `IMO.TriangleConfig`. Moves: - (none) Deletions: - (none) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO awaiting-author new-contributor	196/0	Archive.lean,Archive/Imo/Imo1975Q3.lean	2	36	['Antidite', 'LLaurance', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	226-32648 7 months ago	226-32648 226 days ago	46-25852 46 days
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	50	['EtienneC30', 'arulandu', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	arulandu assignee:arulandu	220-41953 7 months ago	610-69502 610 days ago	1-21124 1 day
30460	janithamalith author:janithamalith	feat(Nat): add lemma nat_card_orbit_mul_card_stabilizer_eq_card_group	Added a lemma `nat_card_orbit_mul_card_stabilizer_eq_card_group` which is the Nat.card version of MulAction.card_orbit_mul_card_stabilizer_eq_card_group --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-group-theory new-contributor	6/0	Mathlib/GroupTheory/GroupAction/CardCommute.lean	1	17	['github-actions', 'kckennylau', 'plp127', 'tb65536']	tb65536 assignee:tb65536	210-52203 6 months ago	210-52203 210 days ago	8-8414 8 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	6	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	209-15735 6 months ago	209-15735 209 days ago	148-3286 148 days
30828	DeVilhena-Paulo author:DeVilhena-Paulo	feat: implementation of `Finmap.merge`	The main contribution of this pull request is the implementation of a `merge` function for finite maps (`Finmap`). The construction relies on the definition of a `merge` function for association lists (`AList`). There is also a side (unrelated) contribution on `Mathlib/Data/List/Permutation.lean`: the addition of a theorem about the permutation of a list with a head element (that is, a list of the form `a :: l`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	449/3	Mathlib/Data/Finmap.lean,Mathlib/Data/List/AList.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/Sigma.lean	4	1	['github-actions']	nobody	207-39167 6 months ago	207-39238 207 days ago	0-80 1 minute
28676	sun123zxy author:sun123zxy	feat(NumberTheory/ArithmeticFunction): wrap `Nat.totient` as an `ArithmeticFunction`	This wraps the Euler's totient function `Nat.totient` into a new `ArithmeticFunction` `ϕ`, with some basic identities such as `ϕ * ζ = id` and `μ * id = ϕ.` --- We use the notation `ϕ` to distinguish from `Nat.totient`'s notation `φ`, however this might be controversial. Suggestions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import merge-conflict awaiting-author	45/5	Mathlib/NumberTheory/ArithmeticFunction.lean	1	19	['MichaelStollBayreuth', 'SnirBroshi', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'sun123zxy']	MichaelStollBayreuth assignee:MichaelStollBayreuth	202-71606 6 months ago	218-46282 218 days ago	47-58311 47 days
30299	franv314 author:franv314	feat(Topology/Instances): Cantor set	Prove that the Cantor set has empty interior and the cardinality of the continuum as discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20few.20results.20about.20the.20Cantor.20set/with/543560670) Moves: - Mathlib.Topology.Instances.CantorSet -> Mathlib.Topology.Instances.CantorSet.Basic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict file-removed awaiting-author t-topology	355/2	Mathlib.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean	4	5	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	202-63336 6 months ago	223-45965 223 days ago	0-2409 40 minutes
30303	franv314 author:franv314	chore(Topology/Instances): add deprecated module	Add deprecated module to moved Cantor set file. --- - [ ] depends on: #30299 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor	486/124	Mathlib.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	202-63334 6 months ago	223-43834 223 days ago	0-340 5 minutes
29871	zach1502 author:zach1502	feat(Matrix/Transvection): Gauss pivot determinant identity and pivot preservation	This PR adds two lemmas formalizing standard Gaussian pivot identities: * `Matrix.Transvection.listTransvecCol_mul_mul_listTransvecRow_pivot`: After applying the canonical left/right transvection products that clear the last column and row, the pivot (bottom-right) entry of a matrix is unchanged. Marked `@[simp]`. * `Matrix.Transvection.det_eq_detTopLeft_mul_pivot`: If the pivot entry is nonzero, then the determinant of the matrix factors as the determinant of the top-left block times the pivot entry, after performing the canonical transvections. This is the usual Gauss–pivot determinant identity. * Added simple usage tests in `MathlibTest/matrix.lean` to check that the new lemmas are usable by `simp`/`simpa`. --- --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	94/0	Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean	2	3	['github-actions', 'riccardobrasca', 'zach1502']	nobody	196-62857 6 months ago	196-62857 196 days ago	41-53449 41 days
30158	nicolaviolette author:nicolaviolette	feat: combinatorics simplegraph basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	9/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	3	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	195-82387 6 months ago	195-82387 195 days ago	31-69826 31 days
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	awaiting-CI new-contributor merge-conflict awaiting-author t-meta	198/0	Mathlib.lean,Mathlib/Tactic/Simproc/PolynomialDegree.lean,MathlibTest/polynomial_degree_simproc.lean	3	19	['5hv5hvnk', 'YaelDillies', 'adomani', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	193-42655 6 months ago	311-59649 311 days ago	2-71043 2 days
30150	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory	Add `AddMonoidalCategory`, the additive version of `MonoidalCategory`. To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since existing code relies on the `AddMonoid M → MonoidalCategory M` instance. For now, we simply implement the additive variants by hand instead. --- As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`. I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`. Next steps would be to: - Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory` - Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory large-import new-contributor merge-conflict awaiting-zulip t-meta	444/125	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	22	['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem', 'mathlib4-merge-conflict-bot']	nobody	187-5646 6 months ago	226-70712 226 days ago	1-160 1 day
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	307/5	Mathlib/Computability/NFA.lean	1	27	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	182-22778 6 months ago	601-50166 601 days ago	45-84611 45 days
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711']	nobody	181-39019 6 months ago	527-2549 527 days ago	23-54870 23 days
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor merge-conflict help-wanted t-analysis	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	7	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	MithicSpirit assignee:MithicSpirit	180-76876 5 months ago	864-15371 864 days ago	0-433 7 minutes
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict modifies-tactic-syntax awaiting-author help-wanted t-meta	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	11	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	180-76612 5 months ago	630-68698 630 days ago	0-16 16 seconds
14237	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`. Part 4 is available here: #14242 - [x] depends on: #14099 Part 1 - [x] depends on: #14216 Part 2 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	22	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	180-76610 5 months ago	629-50433 629 days ago	6-3525 6 days
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	21	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	180-76481 5 months ago	656-42712 656 days ago	1-48443 1 day
17587	kmill author:kmill	feat: Sym2-as-Finset theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	105/3	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/RingTheory/Polynomial/Vieta.lean	4	11	['FordUniver', 'YaelDillies', 'github-actions', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76327 5 months ago	unknown	0-0 0 seconds
18630	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.mergeSort	This PR adds the formalization of the runtime complexity of the merge sort algorithm, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15451 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability new-contributor	526/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	9	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76325 5 months ago	559-41728 559 days ago	0-77273 21 hours
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-zulip new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	7	['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey']	nobody	180-76187 5 months ago	378-22716 378 days ago	75-77754 75 days
21903	yhtq author:yhtq	feat: add from/toList between `FreeSemigroup` and `List` with relative theorems	Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-CI large-import merge-conflict label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	12	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76047 5 months ago	407-60002 407 days ago	50-9294 50 days
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	35	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	180-76041 5 months ago	427-70054 427 days ago	20-81245 20 days
22302	658060 author:658060	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	3	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	180-76032 5 months ago	447-23634 447 days ago	0-1528 25 minutes
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	merge-conflict awaiting-author t-analysis new-contributor	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	13	['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'mhk119']	nobody	180-76019 5 months ago	409-4736 409 days ago	23-16830 23 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics new-contributor	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	42	['IvanRenison', 'github-actions', 'mathlib4-merge-conflict-bot', 'vlad902']	kmill assignee:kmill	180-75866 5 months ago	266-74447 266 days ago	123-18878 123 days
25739	literandltx author:literandltx	feat(NumberTheory/LegendreSymbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	merge-conflict awaiting-author t-number-theory new-contributor	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	3	['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	literandltx assignee:literandltx	180-75717 5 months ago	323-12880 323 days ago	17-63153 17 days
26165	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself	Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then ``μ.ennrealVariation = μ`. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author merge-conflict blocked-by-other-PR new-contributor	467/0	Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/Order/Partition/Finpartition.lean	3	9	['github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot', 'oliver-butterley', 'yoh-tanimoto']	nobody	180-75528 5 months ago	317-70483 317 days ago	15-66224 15 days
26300	igorkhavkine author:igorkhavkine	feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space	If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. --- this is the migration of #25304 to the PR-from-fork workflow - [x] depends on: #25564 - [x] depends on: #26273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor awaiting-author t-analysis merge-conflict	468/0	Mathlib/Analysis/Calculus/FDeriv/Partial.lean	3	23	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	180-75505 5 months ago	277-37495 277 days ago	44-77029 44 days
26594	metakunt author:metakunt	feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod	This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort.	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	3	['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75357 5 months ago	296-32715 296 days ago	25-5233 25 days
26757	fweth author:fweth	feat(CategoryTheory/Topos): define elementary topos	This commit begins the formalization of the notion of an elementary topos, following the definition in \[Mac Lane & Moerdijk, Sheaves in Geometry and Logic (1992), Ch. IV, Section 1]. It introduces the file `Mathlib/CategoryTheory/Topos/Basic.lean`, which currently includes: * The definition of an elementary topos. * Proof that the power object map is a functor * Theorem about pullbacks of characterstic maps Subobject classifiers, which are used in the definition, have already been defined in `CategoryTheory/Topos/Classifier.lean` Work in progress: further formalization of the section is planned. Questions: * Should the definition of power objects be separated into its own file/module, perhaps under `CategoryTheory/Topos/PowerObject.lean`? * Is the notation `P` / `P_morph` / `P_functor` for the power object functor on objects / morphisms / total acceptable? * Should the comments and docstrings rather use the notation from the book, where `g ∘ f` denotes arrow composition from righ to left, or the Lean variant `f ≫ g`? Klaus Gy klausgy@gmail.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	401/66	Mathlib.lean,Mathlib/CategoryTheory/Closed/PowerObjects.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean	9	17	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	180-75352 5 months ago	210-41971 210 days ago	62-6838 62 days
27155	Pjotr5 author:Pjotr5	feat: Shearer's bound on the independence number of triangle free graphs	I added the file IndependenceNumber.lean to the Mathlib.Combinatorics.SimpleGraph.Triangle folder. It contains a proof of a theorem by Shearer on the independence number of triangle-free graphs . I was told this might be useful to add to Mathlib a Zullip thread linked [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Convexity.20of.20a.20specific.20function/with/510469526). I tried to comply as much as I could with the Mathlib style guide, but I realise that there is probably still a significant amount of editing to be done. For one thing: there are probably some lemmas and theorems in there that might be better suited in other files, but since this is my first PR I though I would all put it in one file before starting to edit a bunch of files. I was also advised to split up the file into multiple smaller PRs, but since everything is basically serving this one proof I could not really find a natural way to do that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics new-contributor	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	10	['Pjotr5', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-75315 5 months ago	268-45624 268 days ago	39-17587 39 days
27753	YunkaiZhang233 author:YunkaiZhang233	feat(CategoryTheory): implemented proofs for factorisation categories being equivalent to iterated comma categories in two ways	--- Completed one of the tasks in TODOs, shown and implemented the details for (X/C)/f ≌ Factorisation f ≌ f/(C/Y). This is migrated from my previous PR #22390 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	13	['YunkaiZhang233', 'b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	180-75160 5 months ago	291-46323 291 days ago	0-3448 57 minutes
27850	fyqing author:fyqing	feat: 0-dimensional manifolds are discrete and countable	This is the converse direction of the classification of 0-dimensional manifolds. The other direction was shown in #22105. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-differential-geometry new-contributor	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	14	['fyqing', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'tb65536']	grunweg assignee:grunweg	180-75158 5 months ago	290-20985 290 days ago	0-5718 1 hour
28125	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics): basic definition of simplicial complexes	This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions.	merge-conflict t-combinatorics new-contributor	374/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-75026 5 months ago	180-75027 180 days ago	99-64548 99 days
28530	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics/SimplicialComplex/Topology): add standard simplices and geometric realisation (colimit + functoriality)	Introduce the standard simplex on a finite vertex set and build the geometric realisation \|X\| of a simplicial complex. Prove that \|X\| is the colimit of the face diagram δ_X : X.faces ⥤ TopCat, and define the induced map on realisations \|φ\| : \|X\| ⟶ \|Y\| for a simplicial map φ. Show that the abstract map from colimit functoriality agrees with the concrete push-forward of barycentric coordinates. Package these into a functor SimplicialComplexCat ⥤ TopCat. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this lays the groundwork to do this. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. I would also like to thank our group members Sebastian Kumar, Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. - [ ] depends on: #28125	merge-conflict blocked-by-other-PR t-combinatorics new-contributor	1826/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Colimit.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Diagram.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Functor.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Map.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/Simplex.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/SimplexMap.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75012 5 months ago	275-28840 275 days ago	0-591 9 minutes
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	6	['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	180-74873 5 months ago	180-74874 180 days ago	55-54919 55 days
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-74239 5 months ago	180-74240 180 days ago	54-82760 54 days
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra new-contributor merge-conflict awaiting-author label:t-algebra$	120/0	Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean	2	19	['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	180-71071 5 months ago	624-64185 624 days ago	48-65595 48 days
31590	SuccessMoses author:SuccessMoses	chore: tag `commutatorElement_def` with `simp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor merge-conflict label:t-algebra$	1/0	Mathlib/Algebra/Group/Commutator.lean	1	3	['github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	180-48946 5 months ago	180-48946 180 days ago	6-8213 6 days
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-topology new-contributor	2137/1	.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	6	47	['github-actions', 'jcommelin']	nobody	180-48087 5 months ago	810-15532 810 days ago	1-20227 1 day
18626	hannahfechtner author:hannahfechtner	feat: define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	180-47934 5 months ago	543-54813 543 days ago	15-38478 15 days
20029	FrederickPu author:FrederickPu	feat(Tactic/simps): allow for Config attributes to be set directly	Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895 Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values. Ex: ``` initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false) ``` These config options are then converted into projections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP new-contributor t-meta	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	180-47871 5 months ago	516-65120 516 days ago	0-34081 9 hours
21269	658060 author:658060	feat(CategoryTheory/Topos): basic definitions and results in topos theory	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory new-contributor merge-conflict awaiting-author	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['658060', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	180-47844 5 months ago	473-26658 473 days ago	0-13879 3 hours
23990	robertmaxton42 author:robertmaxton42	feat(Types.Colimits): Quot is functorial and colimitEquivQuot is natural	Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	180-47727 5 months ago	392-46662 392 days ago	8-27136 8 days
27991	sinianluoye author:sinianluoye	feat(Rat): add Rat.den_eq_of_add_den_eq_one and its dependent lemmas	```lean4 example {q r : ℚ} (h : (q + r).den = 1) : q.den = r.den := by ``` It is so simple, but I couldn't find it in current mathlib repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	22/0	Mathlib/Data/Rat/Lemmas.lean	1	33	['github-actions', 'kim-em', 'mathlib-bors', 'pechersky', 'sinianluoye', 'themathqueen']	pechersky assignee:pechersky	180-47410 5 months ago	211-71004 211 days ago	74-56654 74 days
28215	5hv5hvnk author:5hv5hvnk	feat: strong and Weak connectivity for Digraphs	strong and weak connectivity in Digraphs --- Should resolve a part of issue #26771 Main additions in the PR: 1. Walks in Digraphs (Walk.lean) - Basic walk structure with start and end vertices - Support for walk operations: append, reverse, length - Support functions: getVert, copy, support 2. Walk Decompositions (WalkDecomp.lean) - takeUntil and dropUntil functions to split walks - rotate operation for loop walks - Theorems relating to walk decomposition properties 3. Subgraphs (subgraph.lean) - Subgraph structure for digraphs - Induced and spanning subgraph predicates - Lattice structure (sup, inf, top, bot) - Coercion to standalone digraphs 4. Paths (Paths.lean) - Trail, Path, Circuit, Cycle definitions - Path structure with no repeating vertices - Theorems relating different path types - Basic connectivity definitions (reachable, weakly/strongly connected) 5. Connectivity (Connected.lean) - Reachability relations and properties - Strong and weak connectivity definitions - Connected component types: - StronglyConnectedComponent - WeaklyConnectedComponent - ConnectedComponent - Component properties and equivalence relations --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor merge-conflict awaiting-author t-combinatorics	1266/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean	6	4	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-47389 5 months ago	268-44971 268 days ago	12-41939 12 days
29574	JarodAlper author:JarodAlper	feat: regular local rings are domains	We have added three new files in Mathlib/RingTheory/LocalRing * EmbeddingDimension.lean * LocalRingDimension.lean * RegularLocalRings.lean We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean This work was done by Jarod Alper and Brian Nugent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	910/3	Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47278 5 months ago	247-48533 247 days ago	1-50449 1 day
28718	imbrem author:imbrem	feat: class for chosen finite coproducts	Added basic `ChosenFiniteCoproducts` class, and started porting some of the lemmas about `ChosenFiniteProducts` suitably translated --- This, combined with #20182 modified to use chosen finite coproducts and premonoidal categories (#21488), should be enough for me to formalize strong Elgot categories, and hence a lot of categorical iteration theory for my PhD thesis. Re-done from #21603 to deal with changes in #24399 and #24390 Eventually, if we really want to harmonize approaches, we could introduce an `AddMonoidalCategory` struct and do the analogous to #24399 and #24390 for additive monoidal structure, but that seems like a massive overcomplication for now. It would allow formalizing fun things like rig categories, though. - [ ] depends on: #30150	blocked-by-other-PR t-category-theory new-contributor merge-conflict awaiting-author	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	9	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	180-47190 5 months ago	270-83744 270 days ago	0-24930 6 hours
26765	KiringYJ author:KiringYJ	feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance	Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies.	awaiting-author t-measure-probability new-contributor	13/0	Mathlib/MeasureTheory/PiSystem.lean	1	14	['EtienneC30', 'KiringYJ', 'dagurtomas', 'github-actions', 'ocfnash']	RemyDegenne assignee:RemyDegenne	180-33586 5 months ago	180-33586 180 days ago	138-3922 138 days
30637	strihanje01 author:strihanje01	feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions	add Lindstrom's theorem and its strengthening for equal intersections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	209/0	Mathlib/Combinatorics/SetFamily/Lindstrom.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	177-55735 5 months ago	180-73894 180 days ago	31-61152 31 days
31796	dobronx1325 author:dobronx1325	feat(Data/Real/EReal): add mul_lt_mul_of_pos_left theorem	This PR adds the theorem `EReal.mul_lt_mul_of_pos_left`, which states that for a positive real number `a` and extended reals `b < c`, left multiplication by `a` preserves the strict order: `(a : EReal) * b < (a : EReal) * c`. The theorem complements existing order-preserving properties for addition in `EReal` and extends the algebraic structure for multiplication. The proof uses basic properties of extended reals and order relations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	23/0	Mathlib/Data/EReal/Operations.lean	1	4	['JovanGerb', 'LLaurance', 'dobronx1325', 'github-actions']	nobody	174-3377 5 months ago	174-59689 174 days ago	6-24874 6 days
32169	saodimao20 author:saodimao20	feat: add convolution_comp_add_right	This PR adds a lemma `convolution_comp_translation_right` showing that convolution commutes with translation on the right operand. Specifically, it proves that for an additive commutative group $G$, the convolution of a function $f$ with a translated function $x \mapsto g(a + x)$ is equal to the convolution of $f$ and $g$ evaluated at $x + a$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor awaiting-author	14/0	Mathlib/Analysis/Convolution.lean	1	3	['github-actions', 'urkud']	nobody	171-76157 5 months ago	171-76157 171 days ago	0-82278 22 hours
32126	nielsvoss author:nielsvoss	feat(Analysis/Normed/Operator): definition of singular values for linear maps	This PR defines a generalization of singular values, the approximation numbers, for continuous linear maps between normed vector spaces. It proves basic lemmas about the approximation numbers and shows that for finite-dimensional vector spaces, the approximation numbers coincide with the standard definition of singular values. See the discussion on Zulip: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Singular.20Value.20Decomposition/with/558914024 Co-authored-by: Arnav Mehta Co-authored-by: Rawad Kansoh --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor	331/0	Mathlib/Analysis/Normed/Operator/SingularValues.lean	1	2	['github-actions', 'nielsvoss']	nobody	171-27298 5 months ago	unknown	0-0 0 seconds
31898	ntapiam author:ntapiam	feat(LinearAlgebra/TensorAlgebra): implement HopfAlgebra for TensorAlgebra	implementation of the natural Hopf algebra structure on the TensorAlgebra	new-contributor t-ring-theory awaiting-author	253/0	Mathlib.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/RingTheory/Bialgebra/FreeAlgebra.lean,Mathlib/RingTheory/Bialgebra/TensorAlgebra.lean,Mathlib/RingTheory/HopfAlgebra/TensorAlgebra.lean	6	64	['YaelDillies', 'github-actions', 'kckennylau', 'ntapiam']	nobody	164-48134 5 months ago	177-14947 177 days ago	0-33607 9 hours
30525	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya): Add Polya Counting	This PR introduces basic definitions and results about colorings under permutation group actions. A coloring is defined as a function X → Y, and the permutation group Equiv.Perm X acts on colorings by precomposition: (g • c) x = c (g⁻¹ • x) This formalizes the natural action of relabeling the elements of X. Main definitions MulAction (Equiv.Perm X) (X → Y): The action of the permutation group on colorings via precomposition. coloringEquiv (c₁ c₂ : X → Y) : Prop: Two colorings are equivalent if they lie in the same orbit under this action, i.e. ∃ f : Equiv.Perm X, f • c₁ = c₂. Main results smul_eq_iff_mem_stabilizer: Characterizes when two group actions on the same coloring are equal, showing that g • c = f • c ↔ f⁻¹ * g ∈ stabilizer c. coloringEquiv_equivalence: Proves that coloringEquiv defines an equivalence relation on X → Y. orbit_size_eq_index: Reformulates the orbit–stabilizer theorem in the context of colorings: \|orbit c\| = \|Perm X\| / \|stabilizer c\| Motivation These results provide foundational infrastructure for studying Burnside’s lemma and Pólya’s enumeration theorem in Mathlib, where the enumeration of distinct colorings up to symmetry plays a central role.	t-combinatorics new-contributor awaiting-author merge-conflict	113/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	8	['IvanRenison', 'alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	164-34896 5 months ago	172-78439 172 days ago	39-43570 39 days
31113	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya.lean): Add additional theorem in `Polya.lean`	--- - [ ] depends on: #30525 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor blocked-by-other-PR merge-conflict	302/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	164-34772 5 months ago	173-57198 173 days ago	16-78251 16 days
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data new-contributor	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	38	['MrSumato', 'github-actions', 'grunweg', 'madvorak', 'mathlib4-merge-conflict-bot', 'plp127']	grunweg assignee:grunweg	164-30374 5 months ago	346-56718 346 days ago	29-59355 29 days
31147	daefigueroa author:daefigueroa	feat(Dynamics): point transitive monoid actions and transitive points	We define point transitivity for a monoid action on a topological space and define the set of transitive points. We add some basic lemmas and implications between topological transitivity and point transitivity. --- - [x] depends on: #28001 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor awaiting-author	114/6	Mathlib/Dynamics/Transitive.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	161-55607 5 months ago	161-55607 161 days ago	18-38983 18 days
31987	saodimao20 author:saodimao20	feat: add monotonicity and relation lemmas for mgf and cgf	Add two lemmas about moment-generating and cumulant-generating functions: - `mgf_mono_in_t_of_nonneg`: For nonnegative random variables, the mgf is monotone in the parameter `t` - `cgf_zero_of_mgf_one`: The cgf equals zero iff the mgf equals one These lemmas are useful for studying properties of mgf and cgf in probability theory. Contributed by sequential-intelligence-lab(SIL), University of Virginia --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor awaiting-author	21/0	Mathlib/Probability/Moments/Basic.lean	1	5	['DavidLedvinka', 'github-actions']	RemyDegenne assignee:RemyDegenne	155-47713 5 months ago	155-47713 155 days ago	21-31799 21 days
32938	0xTerencePrime author:0xTerencePrime	feat(Order/LocallyFinite): prove DenselyOrdered and LocallyFiniteOrder are incompatible	## Summary This PR proves that a nontrivial densely ordered linear order cannot be locally finite. ## Main results * `not_locallyFiniteOrder`: A densely ordered locally finite linear order must be subsingleton. * `not_locallyFiniteOrder_of_nontrivial`: The main theorem - incompatibility of the two properties. Note: This implementation imports `Mathlib.Order.Interval.Set.Infinite` to reuse the existing `Set.Icc_infinite` theorem, ensuring standard library consistency. ## Mathematical content The key insight is that in a densely ordered type, we can always find a new element between any two distinct elements. This means any nontrivial interval contains infinitely many elements. However, `LocallyFiniteOrder` requires intervals to be finite. This contradiction implies that such a type cannot exist (unless it is trivial). ## Motivation This resolves a TODO mentioned in #7987 (Data/Finset/LocallyFinite entry). ## Verification - [x] `lake build Mathlib.Order.LocallyFinite.Basic` passes - [x] `lake exe runLinter Mathlib.Order.LocallyFinite.Basic` passes	t-order new-contributor awaiting-author	28/0	Mathlib/Order/Interval/Finset/Basic.lean	1	10	['0xTerencePrime', 'CoolRmal', 'github-actions', 'jcommelin', 'plp127']	nobody	150-71115 4 months ago	150-71155 150 days ago	3-22290 3 days
32698	farruhx author:farruhx	feat(List): add aesop / simp annotations to selected lemmas for improved automation	This PR adds `@[aesop safe]` and `@[simp]` annotations to a set of List lemmas whose proofs are routine and benefit from standardized automation. No statements or definitions are changed; only proof annotations are added. The lemmas updated in this PR are: * `or_exists_of_exists_mem_cons` * `append_subset_of_subset_of_subset` * `map_subset_iff` * `append_eq_has_append` * `append_right_injective` * `append_left_injective` * `reverse_surjective` * `reverse_bijective` * `mem_getLast?_append_of_mem_getLast?` * `mem_dropLast_of_mem_of_ne_getLast` * `idxOf_eq_length_iff` * `idxOf_append_of_mem` * `length_eraseP_add_one` The goal is to make these commonly used lemmas easier for `aesop`-based automation to resolve, while avoiding any interference with simp-normal-form lemmas or canonical rewrite rules. There are no API changes and no new theorems—only improved automation behavior.	t-data new-contributor awaiting-author	18/1	Mathlib/Data/List/Basic.lean	1	8	['artie2000', 'euprunin', 'farruhx', 'github-actions']	pechersky assignee:pechersky	150-19484 4 months ago	150-19484 150 days ago	7-31364 7 days
27817	zhuyizheng author:zhuyizheng	feat: add IMO2025P1	Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO awaiting-author new-contributor merge-conflict	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	9	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'zhuyizheng']	dwrensha assignee:dwrensha	149-51681 4 months ago	209-16249 209 days ago	59-36769 59 days
33218	Blackfeather007 author:Blackfeather007	feat(Algebra): Define the associated graded ring to filtered ring	Define the associated graded ring to a filtered ring. --- - [ ] depends on: #33217 migrated from https://github.com/leanprover-community/mathlib4/pull/26858	t-ring-theory new-contributor blocked-by-other-PR	450/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84346 4 months ago	147-3231 147 days ago	0-132 2 minutes
33219	Blackfeather007 author:Blackfeather007	feat(Algebra): Define associated graded algebra	Define the associated graded algebra of a filtered algebra, constructed from a special case of associated graded ring. --- - [ ] depends on: #33218 migrated from #26859	t-ring-theory new-contributor blocked-by-other-PR	563/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84238 4 months ago	147-3005 147 days ago	0-133 2 minutes
33220	Blackfeather007 author:Blackfeather007	feat(Algebra): Define associated graded module	Define the associated graded module to a filtered module. --- - [ ] depends on: #33218 migrated from #26860	t-ring-theory new-contributor blocked-by-other-PR	669/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84154 4 months ago	147-2817 147 days ago	0-137 2 minutes
33227	Blackfeather007 author:Blackfeather007	feat(Algebra): exact of associated graded exact	We proved that a chain complex is exact if its associated graded complex is exact. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33226 migrated from #26869	t-ring-theory new-contributor blocked-by-other-PR	728/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81826 4 months ago	146-81827 146 days ago	0-1208 20 minutes
33226	Blackfeather007 author:Blackfeather007	feat(Algebra): associated graded exact of exact and strict	In this file, we define the concept of exhaustive filtrations. We also prove a AssociatedGradedRingHom sequence is exact iff each GradedPieceHom is exact. And when a sequence is strict exact, the corresponding AssociatedGradedRingHom sequence is also exact. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33222 migrated from #26868	t-ring-theory new-contributor blocked-by-other-PR	529/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81824 4 months ago	146-81825 146 days ago	0-1307 21 minutes
33225	Blackfeather007 author:Blackfeather007	feat(Algebra): filtered module hom	In this PR we defined the filtered semi-linear map for filtered module and the associated graded module hom. --- - [ ] depends on: #33220 - [ ] depends on: #33223 migrated from #26867	t-ring-theory new-contributor blocked-by-other-PR	1205/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81823 4 months ago	146-81824 146 days ago	0-1805 30 minutes
33224	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered alghom	In this PR, we define the filtered algebra homomorphisms on algebras and prove some basic properties of them. --- - [ ] depends on: #33219 - [ ] depends on: #33223 migrated from #26863	t-ring-theory new-contributor blocked-by-other-PR	1055/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81821 4 months ago	146-81822 146 days ago	0-2046 34 minutes
33223	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered ring homomorphism	In this PR, we define the filtered ring morphisms on rings and prove some basic properties of them. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33218 - [ ] depends on: #33222 migrated from #26862	t-ring-theory new-contributor blocked-by-other-PR	824/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81818 4 months ago	146-81821 146 days ago	0-2257 37 minutes
33222	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered add group hom	In this file we define filtered hom and the corresponding associated graded hom for abelian groups. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33217 migrated from #26861	new-contributor t-ring-theory blocked-by-other-PR	368/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81817 4 months ago	146-81818 146 days ago	0-2249 37 minutes
32264	jjtowery author:jjtowery	feat(Bicategory): add lax slice bicategory	--- In this PR, I define the lax slice bicategory for a lax functor over an object. I also give the change of slice strict pseudofunctor. These are from Section 7.1 of Johnson & Yau and are essential for their Whitehead theorem for bicategories (lax functor biequivalence iff essentially surjective, essentially full, and fully faithful), which I'd like to prove at some point. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	527/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LaxSlice.lean	2	12	['dagurtomas', 'github-actions', 'jjtowery', 'robin-carlier']	dagurtomas assignee:dagurtomas	143-23903 4 months ago	166-27360 166 days ago	3-47959 3 days
32960	dleijnse author:dleijnse	feat(FieldTheory): adjoin pth roots	For a field `k` of exponential characteristic `p` and a subset `S` of `k`, we define the extension of `k` obtained by adjoining all `p`-th roots of elements of `S`. We prove that this is a purely inseparable extension, and provide some basic API. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	131/0	Mathlib.lean,Mathlib/FieldTheory/PurelyInseparable/AdjoinPthRoots.lean	2	13	['artie2000', 'chrisflav', 'dleijnse', 'erdOne', 'github-actions', 'leanprover-radar']	erdOne assignee:erdOne	142-40555 4 months ago	142-40555 142 days ago	10-12739 10 days
33163	Aaron1011 author:Aaron1011	feat: prove subgroup of (M -> Z) is finitely generated	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	5/0	Mathlib/RingTheory/DedekindDomain/Dvr.lean	1	2	['erdOne', 'github-actions']	alreadydone assignee:alreadydone	142-33505 4 months ago	142-33505 142 days ago	5-81520 5 days
33133	0xTerencePrime author:0xTerencePrime	feat(Algebra/Group/Center): add Decidable (IsMulCentral a) instance	This PR adds a `Decidable` instance for `IsMulCentral a`. ### Summary The structure `IsMulCentral` was missing a `Decidable` instance. This PR provides the instance by leveraging `isMulCentral_iff`, enabling decidability for both multiplicative and additive (via `to_additive`) structures. ### Verification - `lake build Mathlib.Algebra.Group.Center` passed. - `lake exe runLinter Mathlib.Algebra.Group.Center` passed.	t-algebra new-contributor awaiting-author label:t-algebra$	7/0	Mathlib/Algebra/Group/Center.lean	1	3	['github-actions', 'robin-carlier']	ocfnash assignee:ocfnash	136-61696 4 months ago	136-61696 136 days ago	12-60805 12 days
33502	MrQubo author:MrQubo	fix(Tactic/ProxyType): Pass params explicitly in proxy_equiv% implementation	Fix [#mathlib4 > `deriving Fintype` with Prop](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60deriving.20Fintype.60.20with.20Prop/with/566118621) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta WIP	12/2	Mathlib/Tactic/ProxyType.lean,MathlibTest/DeriveFintype.lean	2	7	['MrQubo', 'github-actions', 'kmill']	kmill assignee:kmill	135-28620 4 months ago	135-28621 135 days ago	0-60133 16 hours
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability please-adopt	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	32	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	133-31618 4 months ago	580-78855 580 days ago	9-73631 9 days
33330	michael-novak-math author:michael-novak-math	feat: add arc-length reparametrization of parametrized curves	add new definitions of arc-length reparametrization and its corresponding parameter transformation and a theorem establishing the desired properties.	t-analysis new-contributor awaiting-author merge-conflict	311/0	Mathlib.lean,Mathlib/Analysis/Calculus/ArcLengthReparametrization.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	57	['SnirBroshi', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'michael-novak-math']	j-loreaux assignee:j-loreaux	131-12573 4 months ago	55-73700 55 days ago	6-69934 6 days
33756	dleijnse author:dleijnse	feat(FieldTheory): root of polynomial with p power coefficients	This PR proves the results in https://stacks.math.columbia.edu/tag/031V, which gives a criterion for a root of a polynomial over a field `k` of characteristic `p` to be a `p`-th power. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	88/0	Mathlib.lean,Mathlib/FieldTheory/PthPowerCoeffPoly.lean	2	1	['github-actions']	nobody	130-50118 4 months ago	unknown	0-0 0 seconds
33299	kingiler author:kingiler	feat: Add decidable membership for Interval	Implemented membership and corresponding decidable instance for `Interval`. Related [#mathlib4 > Proposal: Add decidable membership for Interval](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Proposal.3A.20Add.20decidable.20membership.20for.20Interval/with/565438009). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor t-order	16/1	Mathlib/Order/Interval/Basic.lean	1	5	['Vierkantor', 'eric-wieser', 'github-actions', 'kingiler']	Vierkantor assignee:Vierkantor	130-41924 4 months ago	130-41924 130 days ago	13-42146 13 days
30142	shalliso author:shalliso	feat(Topology/Baire): define IsNonMeagre	non-meagre sets (also known as "of the second category") are worthy of their own definition and API. This was useful to me for formalizing a result of "automatic continuity", that is, a Baire-measurable homomorphism between Polish groups must be continuous. Simply working with the negation of IsMeagre quickly became cumbersome, and non-meagre sets have an important role in the study of Polish (e.g. locally compact) groups. From https://github.com/shalliso/automatic_continuity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor merge-conflict awaiting-author	83/1	Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean	2	6	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	129-51608 4 months ago	129-51609 129 days ago	98-58846 98 days
32880	0xTerencePrime author:0xTerencePrime	feat(Analysis/Asymptotics): define subpolynomial growth	## Main definitions * `Asymptotics.IsSubpolynomial l f g`: A function `f` has subpolynomial growth with respect to `g` along filter `l` if `f = O(1 + ‖g‖^k)` for some natural `k`. ## Main results * `IsSubpolynomial.const`: Constant functions have subpolynomial growth * `IsSubpolynomial.id`: Identity has subpolynomial growth * `IsSubpolynomial.add`: Closure under addition * `IsSubpolynomial.neg`: Closure under negation * `IsSubpolynomial.sub`: Closure under subtraction * `IsSubpolynomial.mul`: Closure under multiplication * `IsSubpolynomial.pow`: Closure under powers * `isSubpolynomial_iff_one_add`: Equivalence with `(1 + ‖g‖)^k` formulation * `IsSubpolynomial.uniform`: Uniform bounds for finite families ## Implementation notes The definition uses `1 + ‖g‖^k` rather than `(1 + ‖g‖)^k` as the primary form, with the equivalence established in `isSubpolynomial_iff_one_add`. Four private auxiliary lemmas handle the key inequalities needed for closure proofs. Closes #32658	awaiting-author t-analysis new-contributor	185/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean	2	29	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	126-34692 4 months ago	127-16150 127 days ago	22-14560 22 days
33948	anivegesana author:anivegesana	feat(Analysis/Normed/Algebra): matrix exponential of nilpotent matrix	Where the matrix exponential and nilpotent elements are defined, both the matrix exponential and the nilpotent element exponential. I had to add a different theorem for normed space exponential and the matrix exponential since the right instances wouldn't be synthesized. Help with golfing would be appreciated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	34/0	Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean	2	1	['github-actions']	nobody	124-85677 4 months ago	124-85749 124 days ago	124-85742 124 days
30391	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	This PR continues the work from #24395. Original PR: https://github.com/leanprover-community/mathlib4/pull/24395	t-data new-contributor awaiting-author	108/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	50	['BoltonBailey', 'IlPreteRosso', 'TwoFX', 'Vierkantor', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'rudynicolop']	TwoFX assignee:TwoFX	122-53023 4 months ago	122-61545 122 days ago	93-10043 93 days
29282	Jlh18 author:Jlh18	feat(CategoryTheory): HasColimits instance on Grpd	Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`. - [ ] depends on: #29283 [Core of a category as a functor] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-category-theory	140/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	120-63103 4 months ago	258-8487 258 days ago	0-396 6 minutes
32745	LTolDe author:LTolDe	feat(Topology/Algebra): add MulActionConst.lean	add Topology/Algebra/MulActionConst.lean introduce class `ContinuousSMulConst` for a scalar multiplication that is continuous in the first argument, in analogy to `ContinuousConstSMul` define `MulAction.ball x U` as the set `U • {x}` given `[SMul G X] (x : X) (U : Set G)` The lemmas shown here will be useful to prove the Effros Theorem, see [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor t-topology	117/0	Mathlib.lean,Mathlib/Topology/Algebra/MulActionConst.lean	2	8	['LTolDe', 'github-actions', 'urkud']	nobody	119-48969 3 months ago	126-28499 126 days ago	16-33128 16 days
33478	anishrajeev author:anishrajeev	feat(ModelTheory): define a subset of the topology over complete types	Define a subset of the Stone Space over a language expanded with countably many constants. Define the proposition to indicate if a language is countable. The subset's density and openness is a future goal to prove (have a branch where it is almost finished), in pursuit of formalizing the proof of the Omitting Types Theorem via properties of Baire spaces. - [ ] depends on: #32215 - [ ] depends on: #32546	t-logic merge-conflict new-contributor blocked-by-other-PR	160/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	8	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	118-42488 3 months ago	126-56312 126 days ago	10-38484 10 days
31092	FlAmmmmING author:FlAmmmmING	feat(Algebra/Group/ForwardDiff.lean): Add theorem `sum_shift_eq_fwdDiff_iter`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	17/1	Mathlib/Algebra/Group/ForwardDiff.lean	1	20	['BeibeiX0', 'FlAmmmmING', 'Ruben-VandeVelde', 'dagurtomas', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	116-49988 3 months ago	116-49988 116 days ago	54-22055 54 days
34141	gululu996-ui author:gululu996-ui	feat(Combinatorics/SimpleGraph/Acyclic): finite trees have at least two degree-one vertices	Add a lemma showing that a finite tree with at least two vertices has at least two vertices of degree 1. - Introduce a helper lemma `SimpleGraph.Connected.one_le_degree` for connected graphs on a nontrivial finite type. - Prove the leaf-count lower bound via the degree-sum identity and a counting argument. ---	awaiting-author new-contributor t-combinatorics	72/2	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['IvanRenison', 'SnirBroshi', 'github-actions', 'vlad902']	nobody	116-46246 3 months ago	118-27682 118 days ago	1-23617 1 day
29953	slashbade author:slashbade	feat: add reap for experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	40/3	Cache/IO.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,lake-manifest.json,lakefile.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	111-38771 3 months ago	unknown	0-0 0 seconds
31377	CoolRmal author:CoolRmal	feat: a series of smooth functions that converges (locally) uniformly is smooth	The main theorem is the proof that an infinite sum of $C^n$ functions on a one-dimensional domain which converges locally uniformly is $C^n$ and related results. This should be compared with [contDiff_tsum](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Calculus/SmoothSeries.html#contDiff_tsum) where the same result is proved for functions on an arbitrary domain but with a slightly stronger convergence assumption. The main motivation for this PR is the [#mathlib4 > Tychonov's Counterexample for the Heat Equation](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tychonov's.20Counterexample.20for.20the.20Heat.20Equation/with/547367912). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author merge-conflict	110/18	Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/Topology/Algebra/InfiniteSum/TsumUniformlyOn.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	5	20	['CoolRmal', 'github-actions', 'mathlib4-merge-conflict-bot', 'ocfnash', 'sgouezel']	ocfnash assignee:ocfnash	110-28344 3 months ago	171-45309 171 days ago	8-14942 8 days
33031	chiyunhsu author:chiyunhsu	feat(Combinatorics/Enumerative/Partition): add combinatorial proof of Euler's partition theorem	The new file EulerComb.lean contains the combinatorial proof of Euler's partition theorem. The analytic proof of the theorem and its generalization of Glaisher's Theorem has already been formalized in [Glaisher.lean](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean). The generalization of the combinatorial proof from this file to Glaisher's Theorem is within reach. --- Zulip discussion: [#mathlib4 > Glaisher’s Bijection on integer partitions](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Glaisher.E2.80.99s.20Bijection.20on.20integer.20partitions/with/570808111) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-zulip awaiting-author	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	7	['chiyunhsu', 'dagurtomas', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	109-51865 3 months ago	109-51865 109 days ago	42-21618 42 days
33817	FlAmmmmING author:FlAmmmmING	fix(Combinatorics/Enumerative/Schroder): fix the definition of `smallSchroder`	In the previous definition, the small Schröder numbers were defined as ```LaTeX s_0 = 1, s_1 = 1, s_2 = 1, s_3 = 3... ``` , which does not match the sequence listed in OEIS A006318. Moreover, this definition makes it difficult to correctly write the generating function for the small Schröder numbers. This PR fixes this issue. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics large-import awaiting-author	61/39	Mathlib/Combinatorics/Enumerative/Schroder.lean	1	20	['FlAmmmmING', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	109-13559 3 months ago	53-82580 53 days ago	74-53798 74 days
34130	FlAmmmmING author:FlAmmmmING	feat(Combinatorics/SimpleGraph/Acyclic): Add new theorem `isTree_iff_uniqueShortest_path`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	28/1	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['IvanRenison', 'github-actions', 'metakunt', 'vlad902']	nobody	108-74272 3 months ago	117-58287 117 days ago	2-6389 2 days
34487	martinwintermath author:martinwintermath	feat(LinearAlgebra/SesquilinearForm): add instances for SeparatingLeft, SeparatingRight and Nondegenerate	Add typeclass instances for `Fact B.SeparatingLeft`, `Fact B.SeparatingRight`, `Fact B.Nondegenerate`: * inferring `Fact B.flip.SeparatingLeft` from `Fact B.SeparatingRight` and vice versa * inferring `Fact B.SeparatingLeft` and `Fact B.SeparatingRight` from `Fact B.Nondegenerate` * inferring `Fact B.SeparatingLeft` and `Fact B.Nondegenerate` for `.id` and `Dual.eval` * inferring `Fact B.Nondegenerate` from `B.IsPerfPair` I also updated `PointedCone.dual_univ` to demonstrate the usefulness of these additions. Note that I needed to add an import to `Cone/Dual.lean` which somehow imports cardinals. So I needed to remove cardinals from `assert_not_exists`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor large-import merge-conflict label:t-algebra$	67/12	Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/PerfectPairing/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	2	4	['github-actions', 'martinwintermath', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	108-60926 3 months ago	49-47263 49 days ago	13-75766 13 days
34028	floor-licker author:floor-licker	feat(SimpleGraph): add max-flow/min-cut weak duality	This PR introduces a basic s–t flow setup for undirected SimpleGraphs and proves the standard weak-duality inequality: for any feasible flow f and any s–t cut S, value f ≤ cutCapacity S. This is a small, self-contained lemma I extracted while working on larger graph-theoretic formalizations, in particular, results that will ultimately rely on a full max-flow/min-cut theorem. The full MFMC equality/existence statement is not included here. This is the weak-duality direction (∀ f S, value f ≤ cutCapacity S).	t-combinatorics new-contributor	169/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/MaxFlowMinCut.lean	2	14	['SnirBroshi', 'floor-licker', 'github-actions', 'mathlib-merge-conflicts']	kmill assignee:kmill	108-13566 3 months ago	59-37095 59 days ago	61-8543 61 days
32609	PrParadoxy author:PrParadoxy	feat(LinearAlgebra/PiTensorProduct): Relation between nested tensor products and tensor products indexed by dependent sums	Product tensors in `⨂ j : (Σ i, β i), s j.fst j.snd` can be mapped to product tensors in `⨂ i, ⨂ b : β i, s i b`. If the outer index type is finite, the two types are equivalent. This allows the definition of endomorphisms on PiTensorProducts by specifying them on disjoint subsets of the index set. Such constructions are common e.g. in quantum circuits, quantum cellular automata, and renormalization procedures. --- WIP. This PR contains two "requests for comments". Essentially: * Is a single complex-to-define linear equivalence preferable over several less complex ones, which might however be of limited interest by themselves? * Which trade-offs are appropriate to make things computable? - [ ] depends on: #32608 - [x] depends on: #32600 - [x] depends on: #32598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-algebra label:t-algebra$	683/0	Mathlib.lean,Mathlib/Data/Sigma/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Nested.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	5	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	107-25677 3 months ago	161-26115 161 days ago	0-2004 33 minutes
30260	imbrem author:imbrem	feat(CategoryTheory/Monoidal): added CocartesianMonoidalCategory	As discussed in #21603 and #28718; this implements chosen finite coproducts on top of `AddMonoidalCategory` as defined in #30150 --- - [ ] depends on: #30150 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import new-contributor t-category-theory	839/125	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Cocartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	5	4	['github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-64508 3 months ago	225-15077 225 days ago	0-1234 20 minutes
30258	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for proofs using `monoidal`	Building on #30150, this allows us to use `@[to_additive]` on proofs containing `monoidal`, by tagging the lemmas `monoidal` outputs with `@[to_additive]` as appropriate. Testing on my branch [`additive-monoidal-coherence`](https://github.com/imbrem/mathlib4/tree/additive-monoidal-coherence) shows that this works. It is still future work to have either the `monoidal` tactic or a new `add_monoidal` tactic work for `AddMonoidalCategory` instances directly. --- - [ ] depends on: #30150 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import new-contributor t-category-theory	524/140	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-64501 3 months ago	225-20730 225 days ago	0-241 4 minutes
32742	LTolDe author:LTolDe	feat(MeasureTheory/Constructions/Polish/Basic): add class SuslinSpace	add new class `SuslinSpace` for a topological space that is an analytic set in itself This will be useful to prove the Effros Theorem, see [zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-measure-probability awaiting-author	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	10	['ADedecker', 'LTolDe', 'dagurtomas', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	106-64275 3 months ago	132-48407 132 days ago	25-76907 25 days
30121	idontgetoutmuch author:idontgetoutmuch	feat(Mathlib/Geometry/Manifold): principal fiber bundle core	A structure capturing what it means to be a principal fibre bundle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	8	['github-actions', 'grunweg', 'idontgetoutmuch', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	106-56216 3 months ago	203-47662 203 days ago	25-16284 25 days
31102	JOSHCLUNE author:JOSHCLUNE	feat: require LeanHammer	Experimenting with adding LeanHammer as a mathlib dependency --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor t-meta	61/4	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/Hammer.lean,lake-manifest.json,lakefile.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-54983 3 months ago	200-27122 200 days ago	0-6852 1 hour
33431	gululu996-ui author:gululu996-ui	feat(Combinatorics/SimpleGraph/Bipartite): characterize bipartite simple graphs by even cycles	Add the classical characterization of bipartite simple graphs: a simple graph is bipartite if and only if every cycle has even length. Previously, mathlib has the definition of `IsBipartite` for `SimpleGraph` and various lemmas about bipartite graphs, but it does not provide this equivalence in a single theorem, so users have to reprove or reassemble it from existing results. Prove the forward direction by showing a 2-coloring alternates along any walk, so every cycle must have even length. Prove the converse by showing that if an odd cycle exists then no bipartition is possible, hence if all cycles are even the graph admits a bipartition.	new-contributor t-combinatorics awaiting-author merge-conflict	186/1	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	6	['NickAdfor', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	kmill assignee:kmill	106-54715 3 months ago	108-55612 108 days ago	26-3983 26 days
34007	martinwintermath author:martinwintermath	feat(Algebra/Module/Submodule/Dual): dual operator for submodules	Add new file `Dual.lean` that defines the dual operator for submodules. The main definition is * `Submodule.dual`: given a bilinear pairing `p` between two modules `M₁` and `M₂` and a submodule `S` in `M₁`, `Submodule.dual p S` is the submodule in `M₂` consisting of all points `y` such that `0 = p x y` for all `x ∈ S`. For reasons of generality, `p` is actually a general sesqui-bilinear map, that is, of the form `p : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M`. This implementation of the `dual` operator for submodules is written to parallel the implementation of `PointedCone.dual`. Include some additional results: * theorems that represent the dual as the kernel of a linear map * theorems for the relation between dual and the `dualAnnihilator` and `dualCoannihilator` of a submodule. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	236/0	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Dual.lean	2	7	['github-actions', 'joelriou', 'martinwintermath', 'mathlib-bors']	joelriou assignee:joelriou	106-50752 3 months ago	108-33211 108 days ago	14-81283 14 days
34703	martinwintermath author:martinwintermath	Generalizing orthogonalBilin	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	49/25	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	3	1	['github-actions']	nobody	106-18255 3 months ago	unknown	0-0 0 seconds
34291	YellPika author:YellPika	feat(Data): a monad for partial computations	This is the code corresponding to [mathlib4 > A monad for partial computations](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20monad.20for.20partial.20computations/with/569619800). Not currently intended to be merged. This PR depends on #33941. The only changes relevant to this discussion are in `OmegaPart.lean`, `OmegaProp.lean`, and `Quot.lean`. # Original Message Inspired by @Aaron Liu's comments in #mathlib4>deprecate Mathlib.Data.Nat.PartENat?@538009243 and #Is there code for X?>Divergence monad@538020049 I made an attempt at constructing a monad for partial computations with a computable `OmegaCompletePartialOrder` instance (neither `Option` nor `Part` support this use case). My solution consists of three parts. A computable version of `Quotient.choice`. As mentioned in #lean4>Quot.lift for dependent products@467436416 , the "obvious" computational interpretation of `Quotient.choice : (∀i:I, @Quotient (A i) …) → @Quotient (∀i:I, A i)` is not sound. However, we _can_ provide a sound computational interpretation when we restrict `I` to `ℕ`: ```lean unsafe def Quotient.countableChoice_impl {α : Nat → Type} {S : ∀ i, Setoid (α i)} (f : ∀ i, Quotient (S i)) : @Quotient (∀ i, α i) (by infer_instance) := Quotient.lift₂ (fun z s ↦ ⟦fun \| .zero => z \| .succ n => s n⟧) (fun z₁ s₁ z₂ s₂ h₁ h₂ ↦ by apply sound rintro ⟨_\|n⟩ · apply h₁ · apply h₂) (f 0) (countableChoice_impl (fun n ↦ f n.succ)) @[implemented_by Quotient.countableChoice_impl] def Quotient.countableChoice {α : Nat → Type} {S : ∀ i, Setoid (α i)} (f : ∀ i, Quotient (S i)) : @Quotient (∀ i, α i) (by infer_instance) := Quotient.choice f ``` My justification for the soundness of this implementation comes from the fact that only uses existing (sound and computable) functions + general recursion. The implementation is found [here](https://github.com/YellPika/mathlib4/blob/99d38f164a97c7aa225283ef6016f0279419a994/Mathlib/Data/Quot.lean#L430) (it uses `unquot` instead of recursion for performance reasons, but should be equivalent). A type of semi-computable propositions. Next, I define a type of semi-computable propositions `ΩProp` as a quotient of the type of boolean sequences `(ℕ → Bool) / ≈`, where `p ≈ q ≝ (∃n, p n) ↔ (∃n, q n)`. A sequence is interpreted as "true" if at least one element in the sequence is `true`, and the quotient relation ensures that we cannot observe the difference between different "true" sequences. The `ΩProp` type has a (computable) `OmegaCompletePartialOrder`, and `Quotient.countableChoice` is used in the implementation of `ωSup`. The implementation of this type is [here](https://github.com/YellPika/mathlib4/blob/quot-choice-compute/Mathlib/Data/OmegaProp.lean). A type of semi-computable computations. Finally, I define the type `ΩPart A` of semi-computable computations returning a value of type `A`. The definition of `ΩPart` is the same as `Part` with `ΩProp` swapped for `Prop`. Again, `ΩPart A` has a (computable) `OmegaCompletePartialOrder` instance. The implementation can be found [here](https://github.com/YellPika/mathlib4/blob/quot-choice-compute/Mathlib/Data/OmegaPart.lean). This was mainly just a fun experiment and the code is not ready to be (or perhaps should not be) put in mathlib. I thought I should post it here to see if 1) there is any interest or 2) an implementation already exists that has escaped my notice.	new-contributor large-import merge-conflict	1157/40	Mathlib/Data/OmegaPart.lean,Mathlib/Data/OmegaProp.lean,Mathlib/Data/Quot.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/ScottContinuity.lean	5	2	['github-actions', 'mathlib-merge-conflicts']	nobody	104-33236 3 months ago	unknown	0-0 0 seconds
34053	christian-oudard author:christian-oudard	feat: Add error function (erf) and complementary error function (erfc)	## Summary I was doing some finance math and needed the Error Function, so I thought I'd contribute it. ### Main definitions * `Real.erf`: The error function, defined as `(2/√π) ∫₀ˣ e^(-t²) dt` * `Real.erfc`: The complementary error function, defined as `1 - erf x` ### Main results * `Real.erf_zero`: `erf 0 = 0` * `Real.erf_neg`: `erf` is an odd function: `erf (-x) = -erf x` * `Real.erf_tendsto_one`: `erf x → 1` as `x → ∞` * `Real.erf_tendsto_neg_one`: `erf x → -1` as `x → -∞` * `Real.erf_le_one`: `erf x ≤ 1` for all `x` * `Real.neg_one_le_erf`: `-1 ≤ erf x` for all `x` * `Real.deriv_erf`: `deriv erf x = (2/√π) * exp(-x²)` * `Real.differentiable_erf`: `erf` is differentiable * `Real.continuous_erf`: `erf` is continuous * `Real.strictMono_erf`: `erf` is strictly monotone Also adds `erf` to `docs/overview.yaml` under Special Functions. --- - [x] Builds successfully - [x] `lake exe runLinter` passes - [x] `lake exe mk_all --check` passes	t-analysis new-contributor awaiting-author	333/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Erf.lean,docs/overview.yaml	3	18	['SnirBroshi', 'christian-oudard', 'github-actions', 'j-loreaux', 'plp127']	j-loreaux assignee:j-loreaux	104-6012 3 months ago	104-42865 104 days ago	14-69133 14 days
33601	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): Concatenation of CFGs is CFG	--- - [ ] depends on: #33599 - [ ] depends on: #33592 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor blocked-by-other-PR	941/0	Mathlib/Computability/ContextFreeGrammar.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	103-70125 3 months ago	133-53988 133 days ago	0-412 6 minutes
34726	GrigorenkoPV author:GrigorenkoPV	feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3	--- Merge of https://github.com/leanprover-community/mathlib4/pull/26349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	159/0	Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean	4	1	['github-actions']	nobody	102-29150 3 months ago	102-29150 102 days ago	3-20994 3 days
34394	Citronhat author:Citronhat	feat(Algebra/Order/Ring): add constructors for linear ordered rings	Add constructors for ordered rings from `mul_nonneg` / `mul_pos` that derive `ZeroLEOneClass` from a linear order.	new-contributor t-algebra awaiting-author label:t-algebra$	31/14	Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/RingTheory/HahnSeries/Lex.lean	2	6	['Citronhat', 'Vierkantor', 'github-actions', 'leanprover-radar']	Vierkantor assignee:Vierkantor	101-62487 3 months ago	101-62487 101 days ago	12-25418 12 days
33493	michelsol author:michelsol	feat(RingTheory/Polynomial): An explicit formula for the Chebyshev polynomials of the first kind	Adds the following explicit formula on the Chebyshev polynomial of the first kind of order n. ${ T_{n}(x)\ =\ \sum \limits _{k=0}^{\lfloor {\frac {n}{2}}\rfloor } {\binom {n}{2k}} \left(\ X^{2}-1\ \right)^{k}\ X^{n-2k}}$ This explicit formula can be found [here](https://en.wikipedia.org/wiki/Chebyshev_polynomials#Explicit_expressions). There is a proof using complex numbers but it only works if the ring R = ℂ. The proof here is by induction and works in a commutative ring R. Mathlib seems to extend the definition of Chebyshev polynomials for $n \in \mathbb{Z}$ but this would make the formula more cumbersome with `n.natAbs` in place of `n`'s, so I expressed it on `n : ℕ` directly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	51/1	Mathlib/RingTheory/Polynomial/Chebyshev.lean	1	8	['YuvalFilmus', 'erdOne', 'github-actions', 'metakunt', 'michelsol']	chrisflav assignee:chrisflav	100-12326 3 months ago	100-12326 100 days ago	35-16105 35 days
34815	Deep0Thinking author:Deep0Thinking	feat(Analysis/SpecialFunctions/ImproperIntegrals): Frullani integral	- [x] depends on: #34966 --- Add a proof of Frullani integral. Main theorems: - `Frullani.integral_Ioi` - `IntegrableOn.tendsto_integral_Ioi` - `exists_integral_div_eq_mul_log` Supporting lemmas: - `Frullani.comp_mul_left_div` - `Frullani.intervalIntegrable_div` - `Frullani.exists_integral_div_eq_mul_log` - `Ioi_diff_Ioc` - `ContinuousOn.comp_mul_left_div`, `ContinuousOn.comp_mul_right_div` - `ContinuousOn.comp_mul_left`, `ContinuousOn.comp_mul_right` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import t-analysis awaiting-author blocked-by-other-PR	270/2	Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Monoid.lean	6	17	['CoolRmal', 'Deep0Thinking', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'sgouezel']	urkud assignee:urkud	99-82441 3 months ago	23-32491 23 days ago	11-36072 11 days
26986	WangYiran01 author:WangYiran01	feat(Partition): add bijection for partitions with max part ≤ r	This PR adds a new theorem `partition_max_equals_bound` to `Mathlib.Combinatorics.Enumerative.Partition`. It constructs a bijection between: - The set of partitions of `n` in which `r ∈ π.parts` and all parts are `≤ r`, and - The set of partitions of `n - r` whose largest part is at most `r`. This provides a constructive proof via removing/adding `r` from/to the partition multiset, in line with classical enumerative combinatorics. Contributed by Yiran Wang.	awaiting-author t-combinatorics new-contributor merge-conflict	92/0	Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Data/Multiset/Lattice.lean	2	20	['WangYiran01', 'github-actions', 'jcommelin', 'kckennylau', 'kim-em', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	97-47200 3 months ago	130-70068 130 days ago	120-67067 120 days
26168	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition	Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author merge-conflict blocked-by-other-PR new-contributor	916/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Jordan.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean	5	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'yoh-tanimoto']	nobody	97-28189 3 months ago	317-70456 317 days ago	15-65390 15 days
34722	GrigorenkoPV author:GrigorenkoPV	feat(Data/Finset/RangeDistance): bound distance between elements of `Finset.range`	--- Rebase of https://github.com/leanprover-community/mathlib4/pull/26347 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-data awaiting-author	34/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	7	['GrigorenkoPV', 'Vierkantor', 'github-actions', 'joneugster', 'mathlib-splicebot', 'plp127']	pechersky assignee:pechersky	97-13478 3 months ago	53-37240 53 days ago	52-18954 52 days
33969	goliath-klein author:goliath-klein	refactor(PiTensorProduct/{InjectiveNorm, ProjectiveNorm}): Currently, injectiveSeminorm = projectiveSeminorm	WIP / RFC! Arguably, `injectiveSeminorm` should be re-defined in Mathlib. See #34137 and [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/injectiveSeminorm/with/568798261) for context. In this file, we collect some results about the current definition and a possible alternative. Contents: * A theorem `injectiveSeminorm_eq_projectiveSeminorm` formalizing the equality of the current definitions. However, I think it is unlikely that keeping the alternative characterization would be worth the effort. The interesting direction `(L2') ≤ (L1)` follows from `norm_eval_le_projectiveSeminorm` which is still present. The converse direction is [somewhat tautological](https://github.com/leanprover-community/mathlib4/pull/34137). A proof of `(L2) = (L1)` (probably requiring Hahn-Banach) might be more interesting. * A preliminary implementation of the injective seminorm as commonly understood. * Sufficient conditions for the multiplicativity property `‖⨂ m i‖_∧ = ∏ ‖m i‖` to hold. This implements a TBD item. --- Co-authored-by: Davood H. H. Tehrani [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor large-import merge-conflict	774/387	Mathlib.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/LeastReasonable.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean	8	3	['github-actions', 'goliath-klein', 'mathlib-merge-conflicts']	nobody	96-30550 3 months ago	124-45654 124 days ago	0-23 23 seconds
33233	jazzits author:jazzits	feat(GroupTheory): add chosen group presentations and Tietze transformations (1) and (2)	Defines a notion of group presentation for G compatible with Mathlib.GroupTheory.PresentedGroup: generators `ι → G` whose range generates G, and relators `rels : Set (FreeGroup ι)` whose normal closure equals the kernel of `FreeGroup ι →* G`. Provides the canonical map `PresentedGroup P.rels →* G` and equivalences showing `PresentedGroup P.rels ≃* G` and invariance under changing presentations. Also formalizes Tietze moves (1)–(2) as equivalences of PresentedGroups: adding/removing a relator that lies in the normal closure of the others. TODO: moves (3)–(4) (add/remove generator with a defining relation). No existing definitions are modified	t-group-theory new-contributor awaiting-author	328/0	Mathlib.lean,Mathlib/GroupTheory/Presentation.lean	2	15	['github-actions', 'homeowmorphism', 'jazzits', 'kbuzzard', 'mathlib-merge-conflicts', 'plp127', 'tb65536']	tb65536 assignee:tb65536	95-59083 3 months ago	140-51630 140 days ago	5-47944 5 days
34725	GrigorenkoPV author:GrigorenkoPV	feat(RingTheory/RootsOfUnity/LowDegree): quadratic, cubic, quartic, quintic roots of unity	Closes https://github.com/leanprover-community/mathlib4/pull/25907 --- Merge of https://github.com/leanprover-community/mathlib4/pull/25907 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory awaiting-author	247/0	Mathlib.lean,Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/RingTheory/RootsOfUnity/LowDegree.lean	4	22	['GrigorenkoPV', 'LLaurance', 'erdOne', 'github-actions', 'joneugster']	nobody	95-23773 3 months ago	100-13093 100 days ago	5-38408 5 days
33032	ksenono author:ksenono	feat(Combinatorics/SimpleGraph): Konig’s theorem on bipartite graphs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor blocked-by-other-PR merge-conflict	832/251	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Konig/Auxillary.lean,Mathlib/Combinatorics/SimpleGraph/Konig/Konig.lean,Mathlib/Combinatorics/SimpleGraph/Konig/KonigFin.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/VertexCover.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean	12	9	['SnirBroshi', 'github-actions', 'ksenono', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	95-7683 3 months ago	151-76739 151 days ago	0-136 2 minutes
34159	wangying11123 author:wangying11123	feat(Geometry/Euclidean/Similarity): Add Triangle similarity on oangle	Add theorems about triangles similarity on oangle	t-euclidean-geometry new-contributor awaiting-author	154/1	Mathlib/Geometry/Euclidean/Similarity.lean	1	8	['LLaurance', 'github-actions', 'jsm28', 'wangying11123']	jsm28 assignee:jsm28	94-57850 3 months ago	95-18679 95 days ago	7-49555 7 days
33050	mkaratarakis author:mkaratarakis	feat: lemmas for the analytic part of the proof of the Gelfond–Schneider theorem	Lemmas missing for the formalisation of the proof of the Gelfond–Schneider theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor WIP	238/0	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/NumberTheory/Transcendental/AnalyticPart.lean,Mathlib/NumberTheory/Transcendental/AnalyticPart2.lean	6	113	['SnirBroshi', 'github-actions', 'j-loreaux', 'mkaratarakis', 'riccardobrasca', 'vihdzp']	riccardobrasca assignee:riccardobrasca	93-40230 3 months ago	103-59487 103 days ago	6-26337 6 days
34814	GrigorenkoPV author:GrigorenkoPV	feat(Tactic/ClearUnneeded): add `clear_unneeded` tactic	--- The simplest version suggested in https://github.com/leanprover-community/mathlib4/issues/25319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta new-contributor please-merge-master awaiting-author	94/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ClearUnneeded.lean,Mathlib/Tactic/Common.lean,MathlibTest/ClearUnneeded.lean,scripts/noshake.json	6	12	['BoltonBailey', 'GrigorenkoPV', 'github-actions', 'joneugster']	joneugster assignee:joneugster	93-27294 3 months ago	101-50667 101 days ago	2-23785 2 days
34876	GrigorenkoPV author:GrigorenkoPV	feat(Tactic/AssumptionQuestion): add `assumption?` tactic	--- As requested in #10361 TODO: maybe add some tests? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta new-contributor awaiting-author	85/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/AssumptionQuestion.lean,Mathlib/Tactic/Common.lean,MathlibTest/AssumptionQuestion.lean,scripts/noshake.json	6	5	['GrigorenkoPV', 'SnirBroshi', 'github-actions', 'joneugster']	joneugster assignee:joneugster	93-25869 3 months ago	101-48857 101 days ago	0-83167 23 hours
33217	Blackfeather007 author:Blackfeather007	feat(Algebra): define associated graded structure for abelian group	In this PR we define the associated graded structure for abelian group when given a filtration and only give some basic lemmas about it. --- migrated from https://github.com/leanprover-community/mathlib4/pull/26857	new-contributor t-ring-theory awaiting-author	144/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	13	['Blackfeather007', 'chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'urkud']	erdOne assignee:erdOne	93-13450 3 months ago	142-27846 142 days ago	4-58698 4 days
23791	SEU-Prime author:SEU-Prime	Create AmiceTrans.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-number-theory new-contributor	2963/0	Mathlib.lean,Mathlib/Analysis/Normed/Ring/Lemmas2.lean,Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PSAC.lean,Mathlib/NumberTheory/Padics/PSAC2.lean,Mathlib/NumberTheory/Padics/PSAC3.lean,Mathlib/NumberTheory/Padics/PiGammainPS.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean,Mathlib/RingTheory/AdicCompletion/Lemma.lean,Mathlib/RingTheory/PowerSeries/Comp.lean,Mathlib/Topology/ContinuousMap/ZeroAtBot.lean	11	5	['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	93-12514 3 months ago	406-45180 406 days ago	0-38 38 seconds
33281	michelsol author:michelsol	feat(Analysis/SpecialFunctions/Integrals): integral of 1/sqrt(1-x^2) and its integrability.	Add the integral of the derivative of arcsin and its integrability. --- - [ ] depends on: #33280 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict t-analysis	59/0	Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	92-68537 3 months ago	144-36362 144 days ago	0-2872 47 minutes
29777	yuanyi-350 author:yuanyi-350	feat(Functional Analysis): closed Range Theorem	- [ ] depends on: #29151 [Corollary of Hahn-Banach theorem] - [ ] depends on: #29776 [refactor ContinuousLinearMap.isOpenMap by separating it into sublemmas] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR new-contributor awaiting-author t-analysis merge-conflict	237/25	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ClosedRange.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	5	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	faenuccio assignee:faenuccio	92-37722 3 months ago	242-49498 242 days ago	0-634 10 minutes
29151	yuanyi-350 author:yuanyi-350	feat: Corollary of Hahn–Banach theorem	In this PR, I have proved [Rudin, Functional Analysis (Theorem 3.7)][rudin1991] which is a step in proving the Closed Range Theorem. Also, I have added tags for the corresponding theorems in Rudin to mathlib. 3.7 Theorem. Suppose B is a convex, balanced, closed set in a locally convex space $X, x_0 \in X$, but $x_0 \notin B$. Then there exists $\Lambda \in X^$ such that $\|\Lambda x\| \leq 1$ for all $x \in B$, but $\Lambda x_0>1$ proof. Since $B$ is closed and convex, we can apply (b) of Theorem 3.4, with $A=\{ x_0 \}$ , to obtain $\Lambda_1 \in X^$ such that $\Lambda_1 x_0=r e^{i \theta}$ lies outside the closure $K$ of $\Lambda_1(B)$. Since $B$ is balanced, so is $K$. Hence there exists $s, 0 List.Vector.* - ... Deletions: - Nat.bit1_add_bit1 - ... Any other comments you want to keep out of the PR commit should go below the `---`, and placed outside this HTML comment, or else they will be invisible to reviewers. If this PR depends on other PRs, please list them below this comment, using the following format: - [ ] depends on: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor large-import t-analysis merge-conflict	70/1	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	17	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	92-33345 3 months ago	239-67173 239 days ago	20-68757 20 days
32918	michelsol author:michelsol	feat: define `supEdist` and `supDist`	Create a new file Topology.MetricSpace.SupDistance and define the supremal distance in (extended) metric spaces. The defined `supEdist` and `supDist` will have similar theory to the already existing `infEdist` and `infDist`. The motivation is to be able to define the radius of a minimal bounding sphere as the infimum of the supDist later. [zulip discussion here](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Jung's.20theorem.20and.20minimal.20bounding.20spheres)	t-topology new-contributor merge-conflict	75/0	Mathlib.lean,Mathlib/Topology/MetricSpace/SupDistance.lean	2	5	['github-actions', 'mathlib4-merge-conflict-bot', 'michelsol', 'urkud']	nobody	91-38636 3 months ago	133-31021 133 days ago	21-3598 21 days
26413	michaellee94 author:michaellee94	feat: existence of maximal solutions for ODEs meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [x] depends on: #26382 - [x] depends on: #29186 - [ ] depends on: #35043 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-analysis merge-conflict	1300/431	Mathlib.lean,Mathlib/Analysis/ODE/Basic.lean,Mathlib/Analysis/ODE/ExistUnique.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,docs/1000.yaml,docs/undergrad.yaml	13	95	['botbaki-review', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'michaellee94', 'winstonyin']	nobody	90-66171 3 months ago	322-51957 322 days ago	0-5139 1 hour
33712	wangying11123 author:wangying11123	feat(Geometry/Euclidean/Angle/Unoriented/Projection): Add sameray_orthogonalProjection_vsub_of_angle_lt	Add sameray_orthogonalProjection_vsub_of_angle_lt `sameray_orthogonalProjection_vsub_of_angle_lt` When an angle is acute, the vector to the orthogonal projection lies in the same ray as the given direction vector.	new-contributor t-euclidean-geometry awaiting-author	20/0	Mathlib/Geometry/Euclidean/Angle/Unoriented/Projection.lean	1	4	['JovanGerb', 'github-actions', 'j-loreaux']	JovanGerb assignee:JovanGerb	90-48467 3 months ago	90-48567 90 days ago	39-6778 39 days
33786	hdmkindom author:hdmkindom	feat(Analysis/Matrix): add Jacobian matrix for matrix-valued functions	This PR introduces the Jacobian matrix for matrix-valued functions `F : Matrix m n ℝ → Matrix p q ℝ`. The Jacobian matrix `jacobianMatrix F X` at point `X` is indexed by `(p × q) × (m × n)`, where each entry represents the partial derivative with respect to a basis element. To handle instance-mismatch issues with matrix norms, we use local Frobenius norm instances. mkdir Analysis/Matrix/Jacobian.lean ## Main definitions - `jacobianMatrix F X`: The Jacobian matrix at point `X`, defined by `jacobianMatrix F X (i, k) (j, l) = (fderiv ℝ F X (Matrix.single j l 1)) i k` ## Main theorems - `fderiv_eq_jacobian_mul`: Express the Fréchet derivative as a contraction with the Jacobian - `jacobianMatrix_comp`: Chain rule for Jacobian matrices - `jacobianMatrix_linear`, `jacobianMatrix_id`, `jacobianMatrix_const`: Basic properties - `jacobianMatrix_add`, `jacobianMatrix_smul`: Linearity properties	t-analysis new-contributor awaiting-author	219/0	Mathlib.lean,Mathlib/Analysis/Matrix/Jacobian.lean	2	11	['erdOne', 'github-actions', 'jcommelin']	sgouezel assignee:sgouezel	90-48115 3 months ago	90-48869 90 days ago	39-35999 39 days
30667	FrederickPu author:FrederickPu	feat(‎Mathlib/Algebra/Group/Subgroup/Pointwise): subgroup mul	Title: feat: pointwise products for subgroups Description: showed the point-wise product of disjoint subgroups is equivalent to their Cartesian product. Based on https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/useful.20group.20theory.20lemmas/with/546738566. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	28/0	Mathlib/Algebra/Group/Subgroup/Pointwise.lean	1	23	['FrederickPu', 'eric-wieser', 'github-actions', 'plp127', 'tb65536']	nobody	90-46976 3 months ago	90-51610 90 days ago	1-21290 1 day
33793	LTolDe author:LTolDe	feat(MeasureTheory/Constructions/Polish/Basic): add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre	add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre, the main ingredient for the proof of the Effros' Theorem, see [#mathlib4 > Effros Theorem](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/566543328) introduce definition of a nowhere meagre set --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor awaiting-author	37/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/GDelta/Basic.lean	3	8	['MichaelStollBayreuth', 'erdOne', 'github-actions', 'j-loreaux']	kex-y assignee:kex-y	90-42733 3 months ago	90-42939 90 days ago	39-9555 39 days
35313	LexinonCraft author:LexinonCraft	feat: IMO 2025 Q4	This adds a solution for problem 4 from the International Math Olympiad 2025. ---	IMO new-contributor awaiting-author	631/0	Archive.lean,Archive/Imo/Imo2025Q4.lean	2	4	['LexinonCraft', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	90-12607 3 months ago	90-12607 90 days ago	3-30421 3 days
33276	NicolaBernini author:NicolaBernini	feat: Rename List.reverse_perm to List.reverse_perm_self and List.reverse_perm' to List.reverse_perm_iff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author t-data merge-conflict	17/15	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/NumberTheory/Divisors.lean	8	5	['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	kim-em assignee:kim-em	89-82751 3 months ago	140-61024 140 days ago	4-4467 4 days
34674	Citronhat author:Citronhat	feat(Algebra/Order/Ring): replace ENNReal lemmas with WithTop versions	* Add `WithTop` versions of basic multiplicative order lemmas. * Use the new `WithTop` lemmas to replace `ENNReal` proofs and address six TODOs. * Fix a typo in the `pos_of_ne_zero` alias name.	new-contributor t-algebra merge-conflict label:t-algebra$	46/15	Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Data/ENNReal/Operations.lean	3	5	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	Ruben-VandeVelde assignee:Ruben-VandeVelde	89-62485 3 months ago	89-62486 89 days ago	17-1225 17 days
28246	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): the n-sphere is simply connected for n > 1	Prove that the `n`-dimensional sphere (i.e., the unit sphere centered at the origin in `(n + 1)`-dimensional real Euclidean space) is a simply connected space for `n > 1`. This proof follows Hatcher's "Algebraic Topology"; we first prove a general lemma about decomposing loops and then exploit the fact that non-surjective loops in the sphere are homotopically trivial. Note: To get this file to build, I edited `Mathlib/Tactic/Linter/DirectoryDependency.lean` to remove the restrictions on AlgebraicTopology files importing Geometry, NumberTheory, and FieldTheory files. Thank you to those who shared their expertise [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Warning.20that.20AlgebraicTopology.20can't.20import.20SetTheory/with/533833638). As I understand it, this is just a short-term solution, so I would appreciate feedback on what to do about this situation. Note: I am unsure where exactly the file `SimplyConnectedSphere.lean` should go or whether that is an appropriate name for the file, so feedback there would be appreciated. --- To provide additional context, this code was written as a part of the Fields Undergraduate Summer Research Program at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza. - [x] depends on: #28208 - [x] depends on: #28198 - [x] depends on: #28185 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor awaiting-author	343/3	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	17	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	87-60271 2 months ago	87-60271 87 days ago	13-72199 13 days
33746	ster-oc author:ster-oc	feat(Algebra/Module/ZLattice): align `ZSpan.floor` to `Int.floor` API	This PR adds some of the existent lemmas about `Int.floor`, `Int.ceil` and `Int.fract` to the `ZSpan` namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor merge-conflict label:t-algebra$	353/145	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Topology/Algebra/Order/Floor.lean	3	8	['github-actions', 'joelriou', 'mathlib-merge-conflicts', 'ster-oc']	joelriou assignee:joelriou	84-79383 2 months ago	84-79383 84 days ago	30-23357 30 days
31766	SuccessMoses author:SuccessMoses	feat(Topology/EMetricSpace): continuity of arc length	fixes half of #31751 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author merge-conflict	396/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	3	40	['SnirBroshi', 'SuccessMoses', 'alreadydone', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	84-24680 2 months ago	160-25550 160 days ago	2-77113 2 days
33257	NickAdfor author:NickAdfor	feat(Combinatorics/SimpleGraph/Bipartite): Odd Cycle Theorem (A Solution to TODO)	Prove bipartite iff all cycles are even This PR formalizes the classical graph theory theorem: a graph is bipartite if and only if all its cycles have even length. Co-authored-by: Nick Adfor Co-authored-by: Yue Sun Co-authored-by: Aristotle AI --- ## Main results - `SimpleGraph.bipartite_iff_all_cycles_even` : the main equivalence theorem ## Key supporting lemmas - `SimpleGraph.even_length_iff_same_color` : parity lemma for 2-colorings - `SimpleGraph.even_length_iff_even_bypass_length` : bypass length parity - `SimpleGraph.even_cycle_length_of_path` : cycle construction lemma - `SimpleGraph.bypass_eq_nil_of_closed` : closed path properties ## Proof outline 1. For bipartite graphs: use the 2-coloring to show that in a 2-coloring, a walk has even length iff its endpoints have the same color. 2. For cycles (start = end), this forces even length. 3. For the converse: if all cycles are even, construct a 2-coloring using the `two_colorable_iff_forall_loop_even` characterization. 4. Show this coloring is valid using bypass operations and path properties. ## Technical notes - Uses `SimpleGraph.Walk` for path/cycle representation - Handles both `IsPath` and `IsCycle` predicates - Uses bypass operations (`takeUntil`, `dropUntil`, `bypass`) to analyze walks - Requires `DecidableEq V` for some lemmas - Uses classical logic for case analysis ## Reviewer notes - The proof uses induction on walks and case analysis on colorings - Some lemmas (like `even_length_iff_same_color`) could be extracted to more general locations - All theorems are in the `SimpleGraph` namespace - The `bipartite_iff_all_cycles_even` theorem provides the complete characterization	t-combinatorics new-contributor awaiting-author LLM-generated merge-conflict	164/8	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	2	80	['IvanRenison', 'NickAdfor', 'Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'euprunin', 'github-actions', 'kmill', 'mathlib-merge-conflicts', 'mitchell-horner', 'vihdzp', 'vlad902']	YaelDillies assignee:YaelDillies	84-13654 2 months ago	55-72342 55 days ago	52-32521 52 days
34419	ster-oc author:ster-oc	feat(RCLike): add `Continuous.re` and similar	This PR adds dot notation for `re`, `im`, `conj` and `ofReal` for `Continuous`, `LipschitzWith` and `Memℓp`. Given `hf : Continuous f` it allows to use `hf.re` to express `Continuous (fun x ↦ (f x).re)`, similarly to the usual `hf.add hg`. I also can add the same features for `Summable` but I am not sure where to place them, suggestions are appreciated! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor awaiting-author merge-conflict	186/41	Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/RCLike/Basic.lean	3	15	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'ster-oc']	j-loreaux assignee:j-loreaux	83-36778 2 months ago	83-36778 83 days ago	8-29654 8 days
33247	sun123zxy author:sun123zxy	feat(Mathlib/RingTheory/Ideal/Cotangent): dimension of cotangent spaces	It is shown that the span rank of the maximal ideal of a local ring equals the dimension of the cotangent space if the maximal ideal is finitely generated. To avoid unnecessary imports, the original `Mathlib/RingTheory/Nakayama` is now moved to `Mathlib/RingTheory/Nakayama/Basic`. --- - [ ] depends on: #33359 - [ ] depends on: #33361 - [ ] depends on: #35651 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed new-contributor t-ring-theory WIP blocked-by-other-PR merge-conflict	140/27	Mathlib.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/LocalRing/Module.lean,Mathlib/RingTheory/LocalRing/Quotient.lean,Mathlib/RingTheory/Nakayama/Basic.lean,Mathlib/RingTheory/Nakayama/SpanRank.lean,Mathlib/RingTheory/Regular/RegularSequence.lean,Mathlib/RingTheory/Support.lean	10	13	['erdOne', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sun123zxy']	nobody	83-21016 2 months ago	142-28164 142 days ago	3-72713 3 days
34853	GrigorenkoPV author:GrigorenkoPV	feat(Combinatorics/Enumerative/Catalan): ratio of subsequent Catalan numbers	--- Should I split this into 2 PRs? Otherwise it'll get squashed & be less concise. UPD: ok, I've opened #34854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	305/195	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Enumerative/Catalan/Basic.lean,Mathlib/Combinatorics/Enumerative/Catalan/Ratio.lean,Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	7	6	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	83-20639 2 months ago	101-48324 101 days ago	1-62439 1 day
35735	mkaratarakis author:mkaratarakis	feat(NumberTheory): analytical properties and lower bounds for Gelfond-Schneider auxiliary function	This PR is the third component in the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem). It connects the algebraically constructed auxiliary function `R(x)` to its analytical properties, establishing the exact order of vanishing and the fundamental lower bound on the norm of its non-zero derivative evaluation. Following the argument in Loo-Keng Hua's Introduction to Number Theory (Chapter 17.9, equations (4) and (5)), we define the minimal non-vanishing derivative order $r$ and scale the evaluation to an algebraic integer to compute its norm. 1. (`iteratedkDeriv_R_eq_zero` & `order_geq_n`): We verify that the coefficient vector $\eta$ (chosen via Siegel's lemma in the previous PR) forces the first $n$ derivatives of the auxiliary function $R(x)$ to vanish at the points $x \in \{1, 2, \dots, m\}$. Consequently, the analytical order of $R(x)$ at these points is at least $n$. 2. We extract $r$, the exact minimal order of vanishing of $R(x)$ among all points $1 \le l \le m$, and prove that $n \le r$. 3. We define the non-zero algebraic number $\rho = (\log \alpha)^{-r} R^{(r)}(l_0)$. 4. We prove the crucial textbook step that scaling $\rho$ by $c_1^{r+2mq}$ (formalized here as `cρ`) results in an algebraic integer in $\mathcal{O}_K$. 5. Because $c_1^{r+2mq} \rho$ is a non-zero algebraic integer, the absolute value of its norm is at least $1$. We use this to formally prove the strict lower bound on the absolute norm of the unscaled $\rho$: $\|N(\rho)\| > c_1^{-h(r+2mq)} > c_5^{-r}$. --- - [ ] depends on: #35734 [optional extra text] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor blocked-by-other-PR	1141/0	Mathlib.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainOrder.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	83-8097 2 months ago	83-30553 83 days ago	0-362 6 minutes
35755	Vilin97 author:Vilin97	feat(Analysis/ODE): forward Euler method convergence	WIP Prove the convergence of the Forward Euler Method. This is the first theorem in most textbooks on numerical analysis for ODEs. --- The initial proof was produced by [Aristotle](https://aristotle.harmonic.fun). The code was then iteratively refined (factoring out lemmas, golfing, simplifying proofs) using Claude Code (Claude Opus 4.6). * [ ] depends on: #35753	new-contributor WIP LLM-generated merge-conflict	297/0	Mathlib.lean,Mathlib/Analysis/ODE/EulerMethod.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	4	7	['Vilin97', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	82-71486 2 months ago	82-73697 82 days ago	0-674 11 minutes
35402	samueloettl author:samueloettl	feat(Dynamics/BirkhoffSum): birkhoffAverage const	--- I think this is useful and one of these should be a simp lemma. I'm not really sure if I got the naming of the theorems correct. When generalizing to the assumption (n : R) ≠ 0 instead of the special case CharZero R with n ≠ 0 I had to use "open Classical in". I'm a bit unfamiliar with that part so please check if this makes sense. See also https://github.com/leanprover-community/mathlib4/pull/35307#discussion_r2823586252 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor	22/0	Mathlib/Dynamics/BirkhoffSum/Average.lean	1	26	['Maldooor', 'github-actions', 'lua-vr', 'mcdoll', 'samueloettl']	mcdoll assignee:mcdoll	82-13656 2 months ago	19-53018 19 days ago	85-51523 85 days
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	60	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud']	nobody	81-69421 2 months ago	427-47360 427 days ago	48-67492 48 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	81-69405 2 months ago	378-51299 378 days ago	39-60525 39 days
30872	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA closure under concatenation	This PR proves that regular languages are closed under concatenation via a direct construction on `NFA`s without `εNFA` nor ε-transitions. The main new definitions and results include: - `M1.concat M2`, the concatenation of `NFA`s `M1` and `M2`, a direct construction without ε-transitions. - Theorem `accepts_concat : (M1.concat M2).accepts = M1.accepts * M2.accepts`, showing the correctness of the construction. - Theorem `IsRegular.mul`, showing that regular languages are closed under concatenation. --- - [x] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	104/7	Mathlib/Computability/NFA.lean	1	67	['YaelDillies', 'ctchou', 'eric-wieser', 'github-actions', 'lambda-fairy', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'rudynicolop']	nobody	81-49276 2 months ago	109-32685 109 days ago	59-63565 59 days
35746	ThomasMoulin-hub author:ThomasMoulin-hub	feat (Algebra/Endomorphisms): add kernels lemma from the missing undergraduate mathematics in mathlib	Add helper theorem inside Mathlib.Algebra.Polynomial.Smeval.lean and created a new file Mathlib/RingTheory/Polynomial/KernelDecomposition.lean that implements the kernels lemma from the missing undergraduate mathematics in mathlib list. This file also contains intermediate results needed for the main lemma.	new-contributor	75/0	Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/RingTheory/Polynomial/Basic.lean	2	2	['github-actions']	nobody	81-20845 2 months ago	unknown	0-0 0 seconds
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-zulip new-contributor awaiting-author	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	42	['YaelDillies', 'dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	81-3034 2 months ago	345-32333 345 days ago	34-10092 34 days
35128	DAE123456 author:DAE123456	feat : Define anti_pascal	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	81/0	Archive.lean,Archive/Imo/Imo2018Q3.lean	2	5	['DAE123456', 'github-actions', 'grunweg', 'vihdzp']	nobody	81-560 2 months ago	96-55124 96 days ago	0-1613 26 minutes
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	please-adopt new-contributor merge-conflict modifies-tactic-syntax good first issue t-meta	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	55	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco']	nobody	80-53732 2 months ago	369-36204 369 days ago	17-14109 17 days
35603	2500223210-max author:2500223210-max	feat(GroupTheory/Frattini): add more theorems	Add some contents about frattini subgroup into Mathlib GroupTheory Frattini.lean,including * (convenient lemma)A subgroup contained in all maximal subgroup is contained in the FRattini subgroup * A subgroup (say H) has a proper complement (meaning for some proper subgroup K, K and H generate the whole group)if and only if it is not contained in the Frattini subgroup. * A group is cyclic iff its Frattini factor(the quotient group wrt Frattini subgroup) is cyclic. * The Frattini factor of a finite p-group is elementary abelian(that is,an abelian group G with Gᵖ={1}) * A finite p-group has trivial Frattini subgroup iff the group is elementary abelian. * Burnside theorem of Frattini factor of finite p-group. ---	new-contributor t-group-theory large-import awaiting-author	764/1	Mathlib/GroupTheory/Frattini.lean	1	3	['github-actions', 'tb65536']	nobody	80-51413 2 months ago	80-51413 80 days ago	5-73876 5 days
33791	PhoenixIra author:PhoenixIra	feat: Generalization of FixedPointApproximants to CompletePartialOrder	--- This PR provides a generalization of FixedPointApproximants to CompletePartialOrder. Not every theorem can be generalized, as sometimes we require additional conditions (namely `x ≤ f x`) in order to guarantee that the set is directed and thus the supremum is well-defined. This is not necessary in a CompleteLattice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	223/100	Mathlib/Order/CompletePartialOrder.lean,Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean	2	21	['PhoenixIra', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	PhoenixIra and vihdzp assignee:PhoenixIra assignee:vihdzp	80-29717 2 months ago	80-29717 80 days ago	44-16098 44 days
35857	AlexeyMilovanov author:AlexeyMilovanov	feat(Logic.Equiv.BijectiveBase2): add bijective base-2 numeration	This PR introduces a formalization of the bijective base-2 numeration system. Unlike standard binary representation, bijective base-2 avoids the "leading zeros" problem, providing a strict mathematical bijection between natural numbers (`ℕ`) and lists of booleans (`List Bool`). Main additions: * `Equiv.BijectiveBase2.toBits`: Encodes `ℕ` to `List Bool`. * `Equiv.BijectiveBase2.ofBits`: Decodes `List Bool` to `ℕ`. * `equivBijectiveBase2`: The formal `ℕ ≃ List Bool` equivalence. --- Zulip: [#PR reviews > PR #35857: Bijective Base-2 Numeration](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration/with/576336540) Zulip: [#batteries > Upstreaming Nat.Bits](https://leanprover.zulipchat.com/#narrow/channel/348111-batteries/topic/Upstreaming.20Nat.2EBits/with/580736051) (Note: This replaces my previously closed PR to avoid the terminology clash between "Dyadic" and dyadic rationals. The namespace and definitions have been updated accordingly). (Note: Used AI to assist with standardizing proof structures).	t-logic new-contributor LLM-generated blocked-by-batt-PR	95/0	Mathlib.lean,Mathlib/Logic/Equiv/ListNatBijective.lean	2	6	['AlexeyMilovanov', 'SnirBroshi', 'github-actions', 'joneugster']	nobody	80-25788 2 months ago	52-62011 52 days ago	27-59600 27 days
35376	michaellee94 author:michaellee94	feat(Geometry/Manifold): orientable manifolds	--- - [x] depends on: #33189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor WIP t-differential-geometry merge-conflict awaiting-author	2116/11	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/MoebiusBand.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Geometry/Manifold/Orientation.lean,Mathlib/Topology/Closure.lean	7	8	['Rida-Hamadani', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	79-19993 2 months ago	92-39439 92 days ago	0-100 1 minute
35734	mkaratarakis author:mkaratarakis	feat(NumberTheory): matrix bounds and Siegel's lemma application for Gelfond-Schneider	This PR is the second component in the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem), establishing the transcendence of $\alpha^\beta$. Building on the algebraic setup from the previous PR #35733, this file establishes analytical bounds on the linear system matrix and applies Siegel's Lemma (Lemma 8.2) to extract a bounded, non-trivial integer solution vector. We establish the exact upper bounds required to construct the auxiliary integer function $R(x)$. `c₃` and Matrix Bounds (`house_matrixA_le`)*: We define the bounding constant $c_3$, which aggregates the base bounds $c_2$ and the maximal houses of the algebraic preimages $\alpha', \beta', \gamma'$. Through extensive algebraic manipulation, we formally prove that the house of the entries in our linear system matrix $A$ is strictly bounded by $c_3^n n^{(n - 1) / 2}$. Using the bounds established above, we apply `house.exists_ne_zero_int_vec_house_le` (a formalization of Lemma 8.2, p. 490) to guarantee the existence of a non-trivial vector of algebraic integers $\eta$ in the kernel of $A$. We define the solution bounding constant $c_4$ and prove the textbook bound that the house of our resulting coefficient vector $\eta$ satisfies $\forall k, \\|\eta_k\\| \leq c_4^n * n^{(n + 1) / 2}$. - [ ] depends on: #35733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory blocked-by-other-PR	872/5	Mathlib.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	78-56923 2 months ago	83-31138 83 days ago	0-306 5 minutes
33714	idontgetoutmuch author:idontgetoutmuch	feat(Mathlib/Geometry/Manifold): Riemannian metrics exist II	Supersedes https://github.com/leanprover-community/mathlib4/pull/33519 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor	680/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	3	200	['Rida-Hamadani', 'github-actions', 'grunweg', 'idontgetoutmuch']	fpvandoorn assignee:fpvandoorn	78-46105 2 months ago	29-53218 29 days ago	74-59970 74 days
34875	banrovegrie author:banrovegrie	feat(LinearAlgebra/Matrix): add Sherman-Morrison formula	Mathlib has the matrix determinant lemma (`det_add_replicateCol_mul_replicateRow` in SchurComplement.lean) but lacked the corresponding inverse formula. This PR fills that gap. - Add `Matrix.inv_add_vecMulVec`: Sherman-Morrison formula for `(A + uv^T)^{-1}` - Add `Matrix.inv_sub_vecMulVec`: subtraction variant - Add `Matrix.isUnit_det_add_vecMulVec`: invertibility under the formula's hypotheses ## Test plan - [x] `lake build` passes - [x] Lines within 100 char limit - [x] All declarations have docstrings Any specific AI usage?: Used Copilot for review purposes.	t-algebra new-contributor awaiting-author label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	14	['Xxxjdjdid', 'banrovegrie', 'chrisflav', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	chrisflav assignee:chrisflav	78-44551 2 months ago	33-41640 33 days ago	69-6728 69 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic): TODO needs a better title	add `card_bijOn` and `finset_subset_preimage_of_finite_image` Add `card_bijOn`: proves that for a bijection between finsets, their cardinalities are equal Add `finset_subset_preimage_of_finite_image`: constructs a finset subset preserving image cardinality Co-authored-by: Junyu Guo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	6	['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	nobody	78-4728 2 months ago	321-70861 321 days ago	13-85893 13 days
35805	adrianmartir author:adrianmartir	feat(NumberTheory/Divisors): Add `infinite_setOf_divisors_iff`	This proves that the set of divisors `{ m \| m \| n }` of a natural number `n` is infinite if and only if `n` is zero. The first proof draft was by @Aristotle-Harmonic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author	10/0	Mathlib/NumberTheory/Divisors.lean	1	6	['adrianmartir', 'alexjbest', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	77-68454 2 months ago	54-47794 54 days ago	27-18698 27 days
35442	dhyan-aranha author:dhyan-aranha	feat: Affine line with doubled origin counter example	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author t-algebraic-geometry	305/0	Counterexamples.lean,Counterexamples/AffineLineWithDoubledOrigin.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean	4	21	['BryceT233', 'chrisflav', 'dhyan-aranha', 'github-actions']	nobody	77-64058 2 months ago	90-52063 90 days ago	0-5488 1 hour
29713	jessealama author:jessealama	feat(Algebra/Homology): add Euler–Poincaré formula	This PR builds on the generalized Euler characteristic framework from #31121 to prove the Euler-Poincaré formula for chain complexes. PR #31121 defines the Euler characteristic for general homological complexes. This PR specializes those definitions to ℤ-indexed chain complexes and proves the main Euler-Poincaré theorem. ### Main result (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homologyEulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional modules over a division ring, the alternating sum of chain dimensions equals the alternating sum of homology dimensions. ### Supporting lemmas The file also provides dimension lemmas generalized to arbitrary `HomologicalComplex (ModuleCat k) c` (not just ℤ-indexed chain complexes): * `HomologicalComplex.dFrom_zero_range` / `dTo_zero_range`: zero range when the target/source object is zero * `HomologicalComplex.dFrom_range_finrank_eq_d` / `dTo_range_finrank_eq_d`: range of `dFrom`/`dTo` has the same dimension as the underlying differential * `HomologicalComplex.range_dTo_le_ker_dFrom`: range of `dTo` is contained in the kernel of `dFrom` --- - [ ] depends on: #38483 (`Antiperiodic.sum_Ico_shift` and bilinear cancellation lemma) Builds on: #31121 Related to: #29639, #29643, #29646	awaiting-author t-algebra new-contributor blocked-by-other-PR label:t-algebra$	428/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Periodic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	2	26	['github-actions', 'jessealama', 'joelriou', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	77-59382 2 months ago	205-74554 205 days ago	35-45800 35 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	14	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'mathlib-merge-conflicts', 'sgouezel']	sgouezel assignee:sgouezel	76-76596 2 months ago	251-72946 251 days ago	27-52841 27 days
34138	pfaffelh author:pfaffelh	feat(MeasureTheory): Introduce `DiscreteMeasure α` giving rise to a `Measure α` as a sum of `dirac`s	Define `DiscreteMeasure α` as a structure with `weight : α → ℝ≥0∞` Define `toMeasure (w : DiscreteMeasure α) : Measure α` as a sum of diracs Show properties of the resulting objects This PR intends to start a more userfriendly interaction with discrete probability (measure) theory, in contrast to probability mass functions (`PMF`). There are two main differences between `DiscreteMeasure` and `PMF`: * Every `PMF` hast the additional property `HasSum 1`, making the resulting measure a probability measure. (For `DiscreteMeasure`, I intend to use the typeclass `IsProbabilityMeasure`in a later PR instead.) * The `toMeasure` function of `MassFunction` defines the measure as a sum of diracs, which immediately makes computations possible. Discussion thread on [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/PMF.20Refactor.3A.20FunLike.20vs.20Definition.20Change) - depends on: #37060 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor	224/0	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/MeasureTheory/Measure/DiscreteMeasure.lean	4	27	['DavidLedvinka', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'metakunt', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	75-60826 2 months ago	28-20678 28 days ago	82-19320 82 days
34940	michaellee94 author:michaellee94	feat: the graph of a continuous function on a $C^n$ manifold is a $C^n$ manifold	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor awaiting-author merge-conflict	536/0	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Instances/Graph.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Topology/Constructions/Graph.lean	5	80	['botbaki-review', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'michaellee94', 'ocfnash']	ocfnash assignee:ocfnash	74-46856 2 months ago	76-27051 76 days ago	15-5284 15 days
35193	Brian-Nugent author:Brian-Nugent	feat(Topology/Closeds): implement category of closed sets in topological spaces	I copied over the nice API for working with `TopologicalSpace.Opens` as a category over for `TopologicalSpace.Closeds`. The only thing that did not immediately transfer was `Topology.IsInducing.functorObj` so I omitted it. Based on work of @kim-em --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor please-adopt merge-conflict awaiting-author	385/0	Mathlib.lean,Mathlib/Topology/Category/TopCat/Closeds.lean,Mathlib/Topology/Category/TopCat/Opens.lean	2	24	['Brian-Nugent', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	dagurtomas assignee:dagurtomas	74-46002 2 months ago	59-46075 59 days ago	17-64811 17 days
35332	yisiox author:yisiox	feat(Computability): regular expressions match a regular language	This PR adds a proof that the language matched by a regular expression is a regular language. This is achieved by the following constructions and proofs of their correctness - A DFA `epsilon` which accepts the empty language - A DFA `char (a : α)` which accepts the language containing only a single symbol - An Epsilon-NFA `concat (M₁ : εNFA α σ₁) (M₂ : εNFA α σ₂)` which accepts the concatenation of the languages of two Epsilon-NFAs - An Epsilon-NFA `kstar (M : εNFA α σ)` which accepts the Kleene star of a language of an Epsilon-NFA The following theorems on closure are added - `IsRegular.zero` - `IsRegular.one` - `IsRegular.top` - `IsRegular.singleton` - `IsRegular.mul` - `IsRegular.kstar` which demonstrates - `IsRegular.matches` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	475/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean	2	2	['github-actions']	nobody	74-35963 2 months ago	unknown	0-0 0 seconds
35834	homeowmorphism author:homeowmorphism	feat(Mathlib/GroupTheory/PresentedGroup): every group has a presentation	We show that every group has a presentation defined by taking the free group with all of the group elements as the generators, and defining the relations as the kernel of the induced subjective homomorphism from that free group to the group itself. Use of AI: This has been vibe-coded with GPT-Codex-5.3, was updated through review, and was double-checked by the author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-group-theory large-import awaiting-author LLM-generated	29/1	Mathlib/GroupTheory/PresentedGroup.lean	1	15	['copilot-pull-request-reviewer', 'euprunin', 'github-actions', 'homeowmorphism', 'mathlib-bors', 'plp127', 'tb65536']	tb65536 assignee:tb65536	74-26177 2 months ago	74-26177 74 days ago	4-30613 4 days
36210	vbeffara author:vbeffara	feat(Combinatorics/SimpleGraph): definitions of graph contraction and graph minor	A contraction is the image of a graph through a surjective function with connected fibers, and a minor is a contraction of a subgraph. This PR shows that being a contraction is transitive, but does not show the same for minors because the proof is more involved, it will be in a subsequent PR. The definitions are in `Prop` and do not contain data, but I'm not sure if that was the right choice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	151/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Contraction.lean,Mathlib/Combinatorics/SimpleGraph/Minor.lean	3	8	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'robin-carlier', 'vbeffara']	b-mehta assignee:b-mehta	74-18533 2 months ago	20-47196 20 days ago	53-33900 53 days
35569	goliath-klein author:goliath-klein	refactor(PiTensorProduct/{InjectiveNorm, ProjectiveNorm}): deprecate `injectiveSeminorm`	This PR: * Deprecates `PiTensorProduct.injectiveSeminorm` and supporting lemmas. * Moves the theory of `liftEquiv` from InjectiveSeminorm.lean to ProjectiveSeminorm.lean. No changes are introduced beyond adding deprecation notices, adapting docstrings, and moving material between files. The PR leaves InjectiveSeminorm.lean almost empty. A new implementation of `injectiveSeminorm`, one which reflects the common mathematical definition, is to be done. This is the third in a series of three PRs with the goal to [deprecate `PiTensorProuduct.injectiveSeminorm`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/injectiveSeminorm/with/568798633). --- - [ ] depends on: #35567 - [ ] depends on: #35568 Deprecations: - injectiveSeminorm - dualSeminorms_bounded - injectiveSeminorm_apply - norm_eval_le_injectiveSeminorm - injectiveSeminorm_le_projectiveSeminorm - injectiveSeminorm_tprod_le Preliminary work toward a reimplementation is at #33969. I've added Davood and myself to the "Authors" field, as we have now significantly refactored this module. Co-authored-by: Davood H. T. Tehrani [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	290/366	Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean	3	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	73-64947 2 months ago	31-72265 31 days ago	48-40574 48 days
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	merge-conflict t-algebra t-category-theory new-contributor label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	21	['fpvandoorn', 'github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	73-59422 2 months ago	666-25446 666 days ago	4-83177 4 days
33592	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	This PR picks up https://github.com/leanprover-community/mathlib4/pull/15895 and resolves the failing lemma by redefining Good symbols. --- I checked that https://github.com/leanprover-community/mathlib4/pull/13514 builds correctly when based on this build. PR for that is #33599 This is my first contribution please let me know of any changes I should outline. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-computability new-contributor	160/0	Mathlib/Computability/ContextFreeGrammar.lean	1	34	['YaelDillies', 'github-actions', 'madvorak', 'nielstron']	nobody	73-48390 2 months ago	122-76917 122 days ago	10-68503 10 days
35144	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Enriched): tensor product of enriched categories	For a braided monoidal category `V`, defines the tensor product of `V`-categories `C` and `D`, and shows that the type of `V`-functors out of the tensor product `C \times D` is equivalent to the type of "enriched bifunctors" `EnrichedBifunctor V C D`. --- This work originates from infinity-cosmos project, where it is used to formalize the notion of cotensors in an enriched category. There are some additional coherence lemmas in a braided monoidal category which have been added. Currently, line 209 violates the style guideline that terminal simp calls should not be squeezed. When I tried to replace this with a single `simp`, I get an error message: `maximum recursion depth has been reached`. Any suggestions (either with this or anything else) are greatly appreciated - thank you! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos awaiting-author	333/0	Mathlib.lean,Mathlib/CategoryTheory/Enriched/TensorProductCategory.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean	3	12	['daniel-carranza', 'emilyriehl', 'github-actions', 'joelriou', 'robin-carlier']	nobody	73-44097 2 months ago	96-33192 96 days ago	0-145 2 minutes
34236	homeowmorphism author:homeowmorphism	feat(GroupTheory/FinitelyPresentedGroup): add finitely presented groups	Formulation of finitely presented groups feat(GroupTheory/FinitelyPresentedGroup): add finitely presented groups We define the notion of `IsFinitelyPresented` with equivalent datatype notions, what it means for a subgroup to be finitely generated in the normal closure, and some instances of finitely presented groups. This started as an ItaLean2025 project. The related Zulip thread is here: https://leanprover.zulipchat.com/#narrow/channel/541885-ItaLean-2025/topic/Projects.3A.20Finitely.20Presented.20Groups/with/567565752. Use of AI: * Aristotle was used for giving a preliminary proof of some statements as this is my first contribution and I wanted to understand how to prove things; they have since been changed. * GPT-5.2 was used to generate some of the proof sub-statements for efficiency once the mathematical blueprints of the proofs have been worked out. * GPT-5.3 was used to rapidly refactor the code. Human review by PR author in-progress, but got to a point where it would be good to get external input. * GPT-5.4 was used to refactor the variables. Human PR author then rewrote the whole thing. --- - [x] depends on: #34580 - [x] depends on: #34624 - [x] depends on: #35033 - [x] depends on: #35029 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor merge-conflict blocked-by-other-PR	459/3	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	5	72	['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'grunweg', 'homeowmorphism', 'kbuzzard', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	nobody	73-42383 2 months ago	60-25276 60 days ago	0-4650 1 hour
27226	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248	awaiting-author t-combinatorics new-contributor merge-conflict	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	4	['b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'xcloudyunx']	b-mehta assignee:b-mehta	73-35490 2 months ago	280-15636 280 days ago	25-83942 25 days
33688	Citronhat author:Citronhat	feat(PMF): add expectation lemmas for Poisson PMF	This PR adds some basic results about the Poisson distribution, its `PMF`, and its expectation. New lemmas: * `poissonPMF_apply` — an unfolding lemma for `poissonPMF`. * `poissonPMFReal_mul_eq_succ_mul` — the standard recursion identity for the Poisson mass function. * `poissonPMFReal_hasSum_nmul` — shows that `fun n ↦ poissonPMFReal r n * n` has sum `r`. * `poissonPMF_tsum_nmul` — the corresponding identity at the level of the `PMF`. * `poissonPMF_coe_tsum_nmul` — the same result after coercion to `ℝ`. Both `ℝ`-valued and `ℝ≥0∞`-valued formulations are included so that these results can be used conveniently in both Lebesgue and Bochner integration contexts.	new-contributor t-measure-probability awaiting-author merge-conflict	21/0	Mathlib/Probability/Distributions/Poisson.lean	1	11	['Citronhat', 'DavidLedvinka', 'github-actions', 'mathlib-merge-conflicts', 'urkud']	urkud assignee:urkud	73-17470 2 months ago	84-32119 84 days ago	47-76876 47 days
34005	MSpill author:MSpill	feat: inverse function theorem for manifolds (concrete version)	Proves the inverse function theorem for manifolds: given manifolds $M, N$ and a $C^n$ map $f : M \to N$ whose differential is a linear isomorphism at $p \in M$, then $f$ is a local diffeomorphism at $p$, provided that both $p$ and its image are interior points. The proof proceeds in 4 main steps: 1. Define composition of partial diffeomorphisms 2. Show that the extended chart at an interior point can be restricted to an open set on which it is a partial diffeomorphism, viewing the model vector space as a manifold modelled on itself trivially 3. Use the inverse function theorem (applied to $f$ written in coordinates) to obtain a partial diffeomorphism between model vector spaces 4. Compose with chart diffeomorphisms to obtain a partial diffeomorphism between the manifolds. ------ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor merge-conflict	232/3	Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	1	12	['MSpill', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	73-17225 2 months ago	123-42738 123 days ago	0-1082 18 minutes
34830	parabamoghv author:parabamoghv	feat(CategoryTheory/Monoidal): add definition of categorical groups	This PR defines of categorical groups, also known as coherent 2-groups, in mathlib. Motivation: Categorical groups are well-studied structures in monoidal category theory, but are not currently available in mathlib. The definitions in this PR follow the existing design patterns used for Category, MonoidalCategory, and BraidedCategory. This PR focuses on setting up the core structure and notation. Basic lemmas and further developments will be provided in a subsequent PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor WIP merge-conflict	163/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/CategoricalGroups/Basic.lean	2	27	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	73-5945 2 months ago	87-74385 87 days ago	5-13145 5 days
36313	SproutSeeds author:SproutSeeds	feat(Inversion): cobounded tendsto near center	Part of #5939 Add `tendsto_inversion_nhdsNE_center_cobounded` in `Mathlib/Geometry/Euclidean/Inversion/Basic.lean`, proving `Tendsto (inversion c R) (𝓝[≠] c) (Bornology.cobounded P)` for `R ≠ 0`. Tools used: Codex 5.3 extra high --- Happy to adjust naming, placement, or proof style based on maintainer preference.	t-euclidean-geometry new-contributor LLM-generated awaiting-author	42/0	Mathlib/Geometry/Euclidean/Inversion/Basic.lean	1	11	['SproutSeeds', 'euprunin', 'github-actions', 'jsm28', 'kbuzzard', 'ocfnash']	jsm28 assignee:jsm28	72-67060 2 months ago	55-63999 55 days ago	6-36700 6 days
35733	mkaratarakis author:mkaratarakis	feat: Algebraic setup and matrix coefficients for Gelfond-Schneider theorem	This PR introduces the foundational algebraic setup and coefficient bounds required for the proof of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem), which establishes that for algebraic numbers $\alpha \neq 0, 1$ and irrational algebraic $\beta$, the number $\alpha^\beta$ is transcendental. Following the contradiction argument presented in Loo-Keng Hua's "Introduction to Number Theory" (Chapter 17.9, 490 -493) Gelfond's Proof), this file constructs the common number field $K$ and sets up the scaled algebraic integers for the auxiliary linear system. This system will later be solved via Siegel's lemma (Lemma 8.2, 490, Hua). This PR is essentially the first half of page 490 in the book. The proof proceeds by assuming $\gamma = \alpha^\beta$ is algebraic, meaning $\alpha$, $\beta$, and $\gamma$ all lie in an algebraic field $K$ of degree $h$. 1. Bundles the common number field $K$, the complex embeddings, and the algebraic preimages $\alpha', \beta', \gamma'$, alongside the core hypotheses of the theorem. 2. Defines the field degree $h = [K : \mathbb{Q}]$, and bounds $m = 2h + 2$ and $n = q^2 / (2m)$ to control the dimensions of the linear system. 3. Defines $c_1$, a natural number chosen so that $c_1 \alpha$, $c_1 \beta$, and $c_1 \gamma$ are algebraic integers in $K$. We prove numerous bounding and integrality lemmas (`isIntegral_c₁α`, `isInt_β_bound`, etc.). 4. Formalizes the core algebraic coefficients $(a+b\beta)^k \alpha^{al} \gamma^{bl}$ which appear in the evaluation of the derivatives of the auxiliary function $R(x)$. 5. By scaling the system by $c_1^{n-1+2mq}$, we successfully restrict the entries of our linear system matrix `A` entirely to the ring of integers $\mathcal{O}_K$, preparing it for the application of Siegel's lemma. 6. House Bounds (`c₂`) : Establishes the foundational base integer $c_2$ to bound the absolute values of the conjugates (houses) of our coefficients. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author	416/0	Mathlib.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Basic.lean	2	19	['MichaelStollBayreuth', 'github-actions', 'mkaratarakis', 'tb65536']	tb65536 assignee:tb65536	72-65964 2 months ago	11-41375 11 days ago	44-79123 44 days
36323	SproutSeeds author:SproutSeeds	feat(Inversion): discontinuity and center/global fderiv formulas	Part of #5939 Adds the discontinuity-at-center lemma for inversion and derives the center/global `fderiv` formulas from it. This draft currently builds on the preceding cobounded-tendsto lemma from #36313 while that earlier slice is under review. Scope is limited to `Mathlib/Geometry/Euclidean/Inversion/Calculus.lean`. Tools used: Codex 5.3 extra high --- Happy to adjust naming, placement, or proof style based on maintainer preference.	t-euclidean-geometry new-contributor LLM-generated	65/0	Mathlib/Geometry/Euclidean/Inversion/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean	2	2	['github-actions']	nobody	72-43271 2 months ago	unknown	0-0 0 seconds
36326	Arnav-panjla author:Arnav-panjla	Feat/gaussian schwartz map	feat(Analysis/SpecialFunctions/Gaussian): define the Gaussian as a Schwartz function in 1D Define the Gaussian function `x ↦ exp (-x^2)` as a `SchwartzMap` in the one-dimensional case. The proof establishes the Schwartz decay conditions by showing that polynomially weighted expressions of the form `(1 + x^2)^m * exp (-x^2)` are bounded. This allows the Gaussian to be packaged using the `SchwartzMap` API. During the implementation a few adjustments were required to match the current Mathlib API. In particular: * replace the non-existent `IsBigO.mul_right` with `IsBigO.of_bound` applied to the full product `(1 + x^2)^m * exp (-x^2)` * fix `mem_cocompact` usage by replacing `(hh_tendsto.eventually ...).mem_cocompact` with `mem_cocompact.mp (hh_tendsto ...)` * adjust the `hb_bound` step using `gcongr` with exact bounds so that both goals close * remove the unused declaration `hf_nonpos` * register the required import in `Mathlib.lean` This implements the one-dimensional case mentioned in the issue. The generalization to Gaussians associated with arbitrary positive-definite bilinear forms can be added in a follow-up PR. Closes #33072	t-analysis new-contributor	235/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/SchwartzMap.lean	2	4	['CoolRmal', 'github-actions']	nobody	72-36598 2 months ago	72-40009 72 days ago	72-40002 72 days
35951	parabamoghv author:parabamoghv	feat(CategoryTheory/Monoidal): evaluation coevaluation isomorphisms	This PR adds four features to rigid categories: 1. `coevaluation_evaluation` and `evaluation_coevaluation` as isomorphism equalities: Using `IsIso` instances for the `evaluation` and `coevaluation` morphisms, we promote the morphism equalities to isomorphism equalities. 2. `ExactPairing Y X` from `ExactPairing X Y`: Using an exact pairing and `IsIso` instances for both `evaluation` and `coevaluation`, we swap the exact pairing by inverting the evaluation and coevaluation morphisms. Any suggestions for the definition name are welcome. Right now it is `ExactPairing.Symm`. The second choice was `ExactPairing.Swap`. 3. `HasLeftDual X` from `HasRightDual X`: Using a `HasRightDual X` instance and relevant `IsIso` instances, we construct a left dual. Similar construction for the other way. 4. `LeftDual` isomorphic to `RightDual`: Using relevant `IsIso` instances, we provide the isomorphism from the left dual of an object to the right dual. This can be achieved in two ways: either by using `leftDualIso` or using `rightDualIso`. We will prove in a subsequent PR that both these isomorphisms are equal. Motivation: This is part of an effort to formalize CategoricalGroups, which can be defined as right rigid groupoids. The approach is motivated by the discussion in [#34830](https://github.com/leanprover-community/mathlib4/pull/34830). Any comments or suggestions are welcome, especially about the naming. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	45/0	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	71-71777 2 months ago	60-39312 60 days ago	7-83579 7 days
35069	A-M-Berns author:A-M-Berns	feat(Geometry/Polygon): simple polygons and boundary map	This PR introduces Simple polygons with the predicate `IsSimple`, which captures the idea of a non-self-intersecting boundary, in the file Simple.lean. In the file Boundary.lean, a boundary map from `AddCircle n` is defined. I prove that the range of this map is the boundary and that this map is injective if and only if the polygon is simple. I kept Boundary.lean and Simple.lean separate because future results will include stuff just about the boundary map independent of simplicity (e.g. that it is continuous in the appropriate setting) and stuff just about simple polygons independent of the boundary map (e.g. that for n = 3, IsSimple iff HasNondegenerateVertices.) I used Claude Code to help generate some of the proof material, but I golfed and edited all AI contribution. - [x] depends on: #34598 ---	new-contributor t-euclidean-geometry LLM-generated	360/0	Mathlib.lean,Mathlib/Geometry/Polygon/Boundary.lean,Mathlib/Geometry/Polygon/Simple.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean	4	30	['A-M-Berns', 'eric-wieser', 'github-actions', 'joneugster', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele']	eric-wieser assignee:eric-wieser	71-1778 2 months ago	82-39524 82 days ago	84-73803 84 days
33668	Citronhat author:Citronhat	feat(PMF): add lintegral formulas for PMF	This PR introduces two lemmas describing the `lintegral` of a function with respect to the measure induced by a probability mass function: - `PMF.lintegral_eq_tsum` - `PMF.lintegral_eq_sum` These are the `ℝ≥0∞` analogues of the existing Bochner `integral` formulas `integral_eq_tsum` and `integral_eq_sum`. They could be useful for reasoning about expectations and integrability. In addition, the proof of `integral_eq_sum` is simplified by deriving it directly from `integral_eq_tsum` using `tsum_fintype`.	t-measure-probability new-contributor awaiting-author merge-conflict	14/5	Mathlib/Probability/ProbabilityMassFunction/Integrals.lean	1	3	['DavidLedvinka', 'github-actions', 'mathlib-merge-conflicts']	nobody	70-30400 2 months ago	76-65143 76 days ago	55-73479 55 days
35317	mkaratarakis author:mkaratarakis	feat: lemmas for the analytic part of the proof of the Gelfond–Schneider theorem (Part 5/5)	If a function `R : ℂ → ℂ` factors as `R z = (z - z₀) ^ r * R₁ z`, where `R₁` is analytic everywhere, then for any `k ≤ r`, there exists an everywhere analytic function `R₂ : ℂ → ℂ` such that the `k`-th iterated derivative of `R` is given by `deriv^[k] R z = (z - z₀) ^ (r - k) * (r! / (r - k)! * R₁ z + (z - z₀) * R₂ z)`. This lemma is necessary for the proof of the Gelfond-Schneider theorem in subsequent PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor t-analysis awaiting-author	62/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	25	['MichaelStollBayreuth', 'github-actions', 'loefflerd', 'mkaratarakis']	loefflerd assignee:loefflerd	70-28365 2 months ago	48-26558 48 days ago	26-7106 26 days
36387	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): parameter uniqueness for quadratic fields	## Summary Prove that every quadratic field `ℚ(√d)` can be normalized to have a squarefree integer parameter, and that this parameter is unique. ## Main Results - `Qsqrtd.rescale`: rescaling isomorphism `ℚ(√d) ≃ₐ[ℚ] ℚ(√(a²d))` for `a ≠ 0` - `Qsqrtd_iso_int_param`: every `ℚ(√d)` is isomorphic to one with an integer parameter - `Qsqrtd_iso_squarefree_int_param`: every `ℚ(√d)` is isomorphic to one with a squarefree integer parameter - `Qsqrtd.param_unique`: if `ℚ(√d₁) ≃ₐ[ℚ] ℚ(√d₂)` with both `d₁, d₂` squarefree and `≠ 1`, then `d₁ = d₂` ## Helper Lemmas - `squarefree_eq_of_rat_sq_mul`: if `d₁ = d₂ · r²` with both squarefree, then `d₁ = d₂` - `int_dvd_of_ratio_square`: if `d₁/d₂` is a rational square and `d₂` is squarefree, then `d₂ ∣ d₁` - `not_isSquare_neg_one_rat`: `-1` is not a square in `ℚ` --- - [ ] depends on: #36347	WIP t-number-theory blocked-by-other-PR new-contributor large-import LLM-generated	400/0	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Defs.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/NumberTheory/QuadraticField/Basic.lean	4	4	['FrankieeW', 'github-actions', 'mathlib-dependent-issues']	nobody	70-7007 2 months ago	71-1277 71 days ago	0-2 2 seconds
35058	GrigorenkoPV author:GrigorenkoPV	chore: move tendsto_{floor,ceil}_at{Top,Bot}	Moves: - Topology.Algebra.Order.Floor.tendsto_floor_atTop -> Order.Filter.AtTopBot.Floor.tendsto_floor_atTop - Topology.Algebra.Order.Floor.tendsto_floor_atBot -> Order.Filter.AtTopBot.Floor.tendsto_floor_atBot - Topology.Algebra.Order.Floor.tendsto_ceil_atTop -> Order.Filter.AtTopBot.Floor.tendsto_ceil_atTop - Topology.Algebra.Order.Floor.tendsto_ceil_atBot -> Order.Filter.AtTopBot.Floor.tendsto_ceil_atBot --- Tracked in #7987 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import awaiting-author	22/25	Mathlib/Order/Filter/AtTopBot/Floor.lean,Mathlib/Topology/Algebra/Order/Floor.lean	2	3	['GrigorenkoPV', 'github-actions', 'j-loreaux']	nobody	69-22228 2 months ago	69-22228 69 days ago	27-45743 27 days
31670	edwin1729 author:edwin1729	feat(Topology/Order): Scott Topology is Sober over Algebraic DCPO	--- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20Algebraic.20complete.20partial.20order.20and.20domain.20theory/with/536359313) here (2/2) PR to prove result in Stone Duality. Here we prove that Scott Topologies over Algebraic DCPOs are sober. - [ ] depends on: #31662 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR new-contributor merge-conflict	510/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	69-20110 2 months ago	unknown	0-0 0 seconds
35812	khwilson author:khwilson	feat(MeasureTheory/Group/GeometryOfNumbers): successive minima and existence of a directional basis	Define the successive minima of a discrete subgroup of a real vector space with respect to a convex set. These invariants show up throughout the geometry of numbers and are the focus of Minkowski's Second Theorem (whose statement is left here with a `proof_wanted`). Note: The key lemma is that the "gauge set" of the convex set is closed. I took the approach of showing that it is sequentially closed. There's an alternative approach via showing it's the union of a finite number of closed sets. I personally thought this approach was more intuitive, but the union approach may result in a slightly shorter proof. Co-authored-by: Yaël Dillies --- - [x] depends on #37738 - [x] depends on #37740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	392/33	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean	6	32	['Vierkantor', 'YaelDillies', 'github-actions', 'joneugster', 'khwilson', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	69-13665 2 months ago	42-4173 42 days ago	36-18181 36 days
36463	AlexeyMilovanov author:AlexeyMilovanov	feat(Data.Nat.Bits): add Nat.ofBits and prove bits_injective	This PR introduces `Nat.ofBitsList` for `List Bool` and provides the missing proofs that the standard binary representation `Nat.bits` is injective (`Nat.bits_injective`) and possesses a right inverse for normalized lists (`Nat.bits_ofBitsList`). `ofBitsList` is implemented as an `abbrev` using `foldr` (keeping it transparent to tactics like `simp`). It serves as the exact left inverse to `bits`. Furthermore, `bits_ofBitsList` establishes that `bits` and `ofBitsList` form a bijection between `ℕ` and the set of lists with no trailing `false` values. This avoids the name collision with `Nat.ofBits` from `Batteries` and aligns with previous Zulip discussions (see [here](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration)) regarding the utility of having a complete list-based API for `Nat.bits` in the library. CC: @linesthatinterlace - Adds `Nat.ofBitsList` (as an `abbrev`) - Adds `Nat.ofBitsList_bits` (left inverse property) - Adds `Nat.bits_injective` - Adds `Nat.ofBitsList_eq_zero_iff` (helper lemma for lists without trailing zeros) - Adds `Nat.bits_ofBitsList` (right inverse property) --- Zulip: [#PR reviews > PR #35857: Bijective Base-2 Numeration](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration/with/576336540) Zulip: [#batteries > Upstreaming Nat.Bits](https://leanprover.zulipchat.com/#narrow/channel/348111-batteries/topic/Upstreaming.20Nat.2EBits/with/580736051)	t-data new-contributor awaiting-author blocked-by-batt-PR	68/1	Mathlib/Data/Nat/Bits.lean	1	5	['github-actions', 'joneugster', 'linesthatinterlace']	nobody	69-5346 2 months ago	59-43666 59 days ago	9-58085 9 days
35684	spitters author:spitters	feat(CategoryTheory/MarkovCategory): Kleisli PMF is a Markov category	Add `Mathlib/CategoryTheory/MarkovCategory/KleisliPMF.lean` showing that `KleisliCat PMF` is a `MarkovCategory`. Uses `Prod` as tensor and `PUnit` as unit; reuses Mathlib's existing `KleisliCat`, `LawfulMonad PMF`, and `MarkovCategory` infrastructure. Builds the full instance stack: MonoidalCategory → BraidedCategory → SymmetricCategory → CopyDiscardCategory → MarkovCategory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author merge-conflict	323/1	Mathlib.lean,Mathlib/CategoryTheory/MarkovCategory/KleisliPMF.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	6	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'spitters']	nobody	68-81626 2 months ago	81-27471 81 days ago	2-36419 2 days
35738	GrigorenkoPV author:GrigorenkoPV	perf: remove some `aesop`s and `grind`s	--- Needs benchmarking. After that I can split it into several smaller portions, if needed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author merge-conflict	236/92	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Rel.lean,Mathlib/Data/Set/Lattice/Image.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/SupIndep.lean	8	7	['github-actions', 'mathlib-merge-conflicts', 'themathqueen', 'vihdzp']	nobody	68-81625 2 months ago	82-63305 82 days ago	0-45583 12 hours
32692	WilliamCoram author:WilliamCoram	feat: define multivariate restricted power series	We define multivariate restricted power series over a normed ring R, and show the properties that they form a ring when R has the ultrametric property. This work generalises my previous work in #26089 which will need to be refactored. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-number-theory new-contributor awaiting-author	178/0	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/RingTheory/MvPowerSeries/Restricted.lean	3	47	['WilliamCoram', 'erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	jcommelin assignee:jcommelin	68-53813 2 months ago	8-7342 8 days ago	42-61064 42 days
36487	samueloettl author:samueloettl	feat(Dynamics): Ergodicity characterization	--- - [ ] depends on: #35402 - [x] depends on: #35451 This is a work in progress for a characterization of ergodicity via a Birkhoff Average. Coarse Feedback is very encouraged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor large-import blocked-by-other-PR	421/1	Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/Ergodic/OnAverageIndependent.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean	3	3	['github-actions', 'mathlib-dependent-issues']	nobody	68-46463 2 months ago	68-46482 68 days ago	0-163 2 minutes
36503	Mrigna01 author:Mrigna01	Add false theorem test file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	135/0	Mathlib/FalseBench/FalseTheorems.lean	1	3	['github-actions']	nobody	68-18508 2 months ago	68-18598 68 days ago	68-18591 68 days
14603	awueth author:awueth	feat: degree is invariant under graph isomorphism	--- Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-combinatorics new-contributor	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	12	['SnirBroshi', 'awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	67-86306 2 months ago	644-46745 644 days ago	31-44440 31 days
33599	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): closure under union	--- This PR picks up https://github.com/leanprover-community/mathlib4/pull/13514 and resolves the outstanding errors. - [ ] depends on: #33592 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-computability new-contributor	498/0	Mathlib/Computability/ContextFreeGrammar.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	67-69743 2 months ago	122-78602 122 days ago	10-65787 10 days
33355	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph/Connectivity): define vertex connectivity	This PR introduces the foundations of vertex connectivity for simple graphs, providing a counterpart to the edge connectivity theory in #32870. ### Main definitions - `SimpleGraph.IsVertexReachable`: vertices remain reachable after removing strictly fewer than `k` other vertices. - `SimpleGraph.IsVertexConnected`: a graph is `k`-vertex-connected if its order is strictly greater than `k` and any two distinct vertices are `k`-vertex-reachable. Includes basic characterizations for $k=0$ and $k=1$, along with monotonicity lemmas (`anti` and `mono`).	new-contributor t-combinatorics awaiting-author	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	147	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	67-69337 2 months ago	15-61698 15 days ago	51-31094 51 days
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	please-adopt t-data new-contributor merge-conflict awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'urkud', 'vihdzp']	nobody	67-69199 2 months ago	847-40687 847 days ago	12-48883 12 days
35652	dennj author:dennj	feat(LinearAlgebra/Matrix): add `Matrix.mul_eq_smul_one_symm`	Adds three lemmas: - IsLeftRegular.mul_eq_of_comm (Algebra/Group/Defs.lean): if a is left-regular, a * b = c, and c commutes with a, then b * a = c. Generalises IsLeftRegular.mul_eq_one_symm from the c = 1 case. - IsRightRegular.mul_eq_of_comm: symmetric version. - mul_eq_smul_one_symm (Algebra/Group/Action/Defs.lean): scalar variant of mul_eq_one_symm. For a monoid β with a compatible scalar action by α, if a * b = c • 1 and a is left-regular, then b * a = c • 1. Proven in one line via IsLeftRegular.mul_eq_of_comm, since c • 1 is central thanks to IsScalarTower α β β and SMulCommClass α β β. The additive analogues are produced by to_additive. The general mul_eq_of_comm helpers capture the underlying pattern: "a left/right-regular element can be cancelled when the conclusion commutes with it" and are reusable beyond this PR's specialisation. Human made PR	t-algebra new-contributor LLM-generated awaiting-author label:t-algebra$	28/0	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Defs.lean	1	7	['dagurtomas', 'dennj', 'eric-wieser', 'github-actions', 'grunweg']	ocfnash assignee:ocfnash	67-49442 2 months ago	15-18845 15 days ago	24-65258 24 days
36587	yhx-12243 author:yhx-12243	feat(Algebra/GCDMonoid): Distributive lattice structure for Associates in GCDMonoid	Add a distributive lattice structure for `Associates α` in `GCDMonoid`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	60/3	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/DistribLattice.lean	2	2	['github-actions']	nobody	66-78020 2 months ago	63-48595 63 days ago	3-29502 3 days
35662	FrankieeW author:FrankieeW	feat(NumberTheory/Zsqrtd): add Archimedean instance via le_arch	This PR follows a suggestion made in #35606 , #35481 - add `Zsqrtd.le_arch_smul` in `Mathlib/NumberTheory/Zsqrtd/Basic.lean` - use it to provide `instance : Archimedean (ℤ√d)` in the `Nonsquare` section - refactor the proof using symmetry to reduce duplication while keeping checks clean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author merge-conflict LLM-generated	46/4	Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean	2	13	['FrankieeW', 'MichaelStollBayreuth', 'euprunin', 'github-actions', 'mathlib-merge-conflicts', 'tb65536']	MichaelStollBayreuth assignee:MichaelStollBayreuth	66-77756 2 months ago	69-55872 69 days ago	15-50475 15 days
36103	SnkXyx author:SnkXyx	feat(Algebra/MvPolynomial/CharacteristicSet): add Characteristic Set	This PR adds some definitions and theorems of Characteristic Set Method (also known as Wu's Method). Definitions: * `MvPolynomial.mainDegree` * `MvPolynomial.initialOf` * `MvPolynomial.reducedTo` * `TriangulatedSet` * `MvPolynomial.pseudo` * `MvPolynomial.setPseudo` * `MvPolynomial.isRemainder` * `MvPolynomial.isSetRemainder` * `AscendingSetTheory` * `TriangulatedSet.isAscendingSet` * `HasBasicSet` * `TriangulatedSet.isCharacteristicSet` * `MvPolynomial.List.characteristicSet` * `MvPolynomial.List.zeroDecomposition` Main Theorems: * `MvPolynomial.initialOf_mul_eq`: $init_i(p \cdot q) = init_i(p) \cdot init_i(q)$ if there is no zero divisors in the coefficient ring. * `TriangulatedSet.instWellFoundedLT`: The set of Triangulated Sets is well-founded under the lexicographic ordering. * `MvPolynomial.pseudo_remainder_isRemainder`: The remainder $r$ of $g$ by $f$ is reduced with respect to $f$ and satisfies $init(f)^s \cdot g = q \cdot f + r$ for some $s \in \mathbb{N}$ and $q \in R[X_{\sigma}]$. * `MvPolynomial.setPseudo_remainder_isSetRemainder`: The remainder $r$ of $g$ by a set $S$ is reduced with respect to $S$ and satisfies $(\prod S_i^{e_i}) \cdot g = \sum q_i \cdot S_i + r$ for some sequences $\{e_i\}$ and $\{q_i\}$. * `MvPolynomial.setPseudo_remainder_eq_zero_of_mem`: The remainder of $p$ by a set $S$ is $0$ if $p \in S$. * `MvPolynomial.List.basicSet_append_lt_of_exists_reducedToSet`: Appending an element which is reduced w.r.t. the basic set of list strictly decreases the order. * `MvPolynomial.List.characteristicSet_isCharacteristicSet`: The computed Characteristic Set $CS$ satisfies the key algebraic property (pseudo-remainder of input polynomials is 0) and the geometric property ( $Zero(PS) \subseteq Zero(CS)$ ). * `MvPolynomial.List.vanishingSet_eq_zeroDecomposition_union`: The zero set of a polynomial system $PS$ can be decomposed into a finite union of "quasi-varieties" defined by triangular sets: $Zero(PS) = \bigcup_{CS \in \mathcal{ZD}} Zero(CS / \text{InitialProd}(CS))$ The PR is upstreamized from [github.com/WuProver/lean_characteristic_set](https://github.com/WuProver/lean_characteristic_set) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #36386 - [x] depends on: #37791	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	4085/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/AscendingSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/CharacteristicSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Initial.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/MainDegree.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Order.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/PseudoDivision.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Reduce.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/StandardAscendingSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/TriangularSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/WeakAscendingSet.lean,docs/references.bib	14	20	['Hagb', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	66-69675 2 months ago	10-69906 10 days ago	15-60289 15 days
36529	idontgetoutmuch author:idontgetoutmuch	Connection 1 form scribbles	Some thoughts on connection 1-forms - not meant to be ever merged but here for convenience of discussion	new-contributor t-differential-geometry	496/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/Algebra/FundamentalVectorField.lean,Mathlib/Geometry/Manifold/IntegralCurve/Compact.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	5	2	['github-actions']	nobody	66-58681 2 months ago	unknown	0-0 0 seconds
36119	Ruizsolveall author:Ruizsolveall	feat(Topology/Covering): fundamental group of the circle is ℤ	- Proves that the fundamental group of the circle `π₁(S¹, 0)` is isomorphic to `ℤ`, via covering space theory. - Constructs the winding number map `nLoop : ℤ → Path 0 0` on `AddCircle 1`, and proves it is surjective (`nLoop_surjective`), injective (`nLoop_homotopic_iff`), and additive (`nLoop_add`). - Assembles these into the group isomorphism `windingNumberIso : Multiplicative ℤ ≃* FundamentalGroup (AddCircle 1) 0`. ## Approach Uses the covering map `ℝ → AddCircle 1` and unique path lifting to establish the bijection between homotopy classes of loops and integers (winding numbers). Homotopy invariance of lifted endpoints gives injectivity; surjectivity follows from lifting arbitrary loops. Additivity uses path concatenation of lifts in the simply connected total space `ℝ`. ## AI disclosure I used Claude (Anthropic) to write the PR description, code comments, and to help refine code style. The proof strategy and all Lean code are my own. I understand and can vouch for all the code in this PR.	t-topology new-contributor awaiting-author LLM-generated	236/0	Mathlib.lean,Mathlib/Topology/Covering/FundamentalGroupCircle.lean	2	26	['Ruizsolveall', 'SnirBroshi', 'b-mehta', 'dagurtomas', 'github-actions', 'grunweg', 'vihdzp']	nobody	66-39983 2 months ago	67-32515 67 days ago	8-31258 8 days
36347	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): define quadratic number fields as QuadraticAlgebra ℚ d 0	Define `Qsqrtd d` as `QuadraticAlgebra ℚ d 0`, representing the quadratic number field `ℚ(√d)`. Prove trace and norm results, show `Qsqrtd d` is a number field and a quadratic extension when `d` is not a perfect square, and prove that `ℚ(√0)` and `ℚ(√1)` are not fields. Include `IsQuadraticField` as a predicate for quadratic extensions of `ℚ`, and bridge lemmas connecting squarefree integer parameters to the non-square condition. This PR is part of a series upstreaming the [QuadraticNumberFields](https://github.com/FrankieeW/QuadraticNumberFields) project. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/quadratic.20number.20fields) --- ### PRs - #36347 （this PR） - #36387 ---	t-number-theory new-contributor large-import awaiting-author LLM-generated	191/0	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Defs.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/NumberTheory/QuadraticField/Basic.lean	4	29	['FrankieeW', 'eric-wieser', 'github-actions', 'riccardobrasca', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	66-13650 2 months ago	63-50045 63 days ago	7-9258 7 days
35651	sun123zxy author:sun123zxy	feat(Mathlib/RingTheory/Ideal/Cotangent): `Submodule.map` definition of cotangent spaces	This PR adds an alternative definition of the cotangent space as an image under the R-module quotient map. --- Split from PR #33247 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	47/20	Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	20	['chrisflav', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'sun123zxy']	chrisflav assignee:chrisflav	65-57094 2 months ago	63-38793 63 days ago	16-12398 16 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	55	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	65-44149 2 months ago	374-67445 374 days ago	72-2714 72 days
31610	rudynicolop author:rudynicolop	feat(Computability/NFA): Kleene star closure for Regular Languages via NFA	This PR constructs a Kleene star closure for non-epsilon NFAs, and proves that regular languages are closed under Kleene star. The NFA construction is `NFA.kstar`. The main theorems are: - `NFA.accepts_kstar`: demonstrates that `M.kstar` accepts the Kleene star closure of the language of `M`. - `IsRegular.kstar`: demonstrates that regular languages are closed under Kleene star. There is an onging zulip discussion about regular languages in Mathlib: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553759136 This discussion is also tracked at #24205. Furthermore, the construction and proofs in this PR are heavily inspired by @TpmKranz from his #15651. #15651 supersedes this PR, so if it is accepted then this PR is not needed. --- - [x] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author awaiting-CI	405/7	Mathlib/Computability/NFA.lean	1	16	['YaelDillies', 'ctchou', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	65-44048 2 months ago	124-36430 124 days ago	43-77831 43 days
36757	alok author:alok	feat(Order/Filter): add Filter.IsFree and Filter.IsNonprincipal	## Summary Adds two filter predicates and their basic API: - `Filter.IsFree`: no point belongs to every set (`f.ker = ∅`), equivalently `f ≤ cofinite` - `Filter.IsNonprincipal`: not equal to `𝓟 s` for any set `s` Every free `NeBot` filter is non-principal (`IsFree.isNonprincipal`), but the converse fails for general filters (e.g. `𝓝 x` in a non-discrete T₁ space is non-principal but not free). For ultrafilters the two notions coincide (`Ultrafilter.isNonprincipal_iff_isFree`). On finite types, no `NeBot` filter is free (`not_isFree_of_neBot`). ## Test plan - [x] `lake build Mathlib.Order.Filter.Cofinite` passes - [x] `lake build Mathlib.Order.Filter.Ultrafilter.Basic` passes 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-order new-contributor	98/1	Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean	2	2	['github-actions']	nobody	63-4319 2 months ago	63-2919 63 days ago	0-3928 1 hour
36825	danlyng author:danlyng	feat(MeasureTheory/Integral/IntegralEqImproper): add Iic variants of nonneg/nonpos derivative integrability and FTC-2	Add the `Iic` counterparts of the existing `Ioi` results for automatic integrability of derivatives on semi-infinite intervals and the corresponding corollaries computing the integral value. Additionally, apply minor fixes to existing docstrings. New declarations: - `integrableOn_Iic_deriv_of_nonneg` / `integrableOn_Iic_deriv_of_nonneg'` - `integrableOn_Iic_deriv_of_nonpos` / `integrableOn_Iic_deriv_of_nonpos'` - `integral_Iic_of_hasDerivAt_of_nonneg` / `integral_Iic_of_hasDerivAt_of_nonneg'` - `integral_Iic_of_hasDerivAt_of_nonpos` / `integral_Iic_of_hasDerivAt_of_nonpos'` These mirror `integrableOn_Ioi_deriv_of_nonneg`, `integrableOn_Ioi_deriv_of_nonpos`, `integral_Ioi_of_hasDerivAt_of_nonneg`, `integral_Ioi_of_hasDerivAt_of_nonpos` and their primed variants.	t-measure-probability new-contributor awaiting-author	107/9	Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean	1	7	['EtienneC30', 'github-actions']	EtienneC30 assignee:EtienneC30	58-54449 1 month ago	58-54449 58 days ago	2-67942 2 days
36719	NoneMore author:NoneMore	feat(ModelTheory): add `PartialType` for first-order theories	This PR adds the definitions of partial types over theories and over parameter sets, and proves several equivalent characterizations. --- - [ ] depends on: #36667 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-logic new-contributor	468/0	Mathlib.lean,Mathlib/ModelTheory/PartialTypes.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	5	['NoneMore', 'github-actions', 'mathlib-dependent-issues', 'vihdzp']	nobody	54-73324 1 month ago	63-72678 63 days ago	0-322 5 minutes
37101	fsefzig author:fsefzig	feat: definition of kummer polynomials and prove that AdjoinRoot (KummerPolynomial n s) is etale	This defines the Kummer polynomial ` KummerPolynomial n s := X^n - s` over a ring R and constructs the following instances for `AdjoinRoot (KummerPolynomial n s)`: · Faithfullyflat · SmoothOfRelativeDimension 0 · Etale	t-ring-theory new-contributor awaiting-author	345/0	Mathlib.lean,Mathlib/RingTheory/AdjoinRootKummer.lean	2	24	['acmepjz', 'chrisflav', 'fsefzig', 'github-actions', 'vihdzp']	nobody	47-38908 1 month ago	unknown	0-0 0 seconds
37585	cascone26 author:cascone26	feat: formal statements of Robin's and Lagarias' inequalities equivalent to RH	## Summary This PR adds `Mathlib/NumberTheory/LSeries/RobinInequality.lean`, which contains formal Lean 4 statements of two classical equivalences of the Riemann Hypothesis: Robin's theorem (1984): RH ↔ σ₁(n) < e^γ · n · ln(ln(n)) for all n > 5040 Lagarias' theorem (2002): RH ↔ σ₁(n) ≤ H_n + exp(H_n) · ln(H_n) for all n ≥ 1 ### New declarations - `robinBound (n : ℕ) : ℝ` — the Robin bound e^γ · n · ln(ln(n)) - `lagariasBound (n : ℕ) : ℝ` — the Lagarias bound H_n + exp(H_n) · ln(H_n) - `robin_iff_RH : RiemannHypothesis ↔ ∀ n > 5040, σ₁(n) < robinBound n` - `lagarias_iff_RH : RiemannHypothesis ↔ ∀ n ≥ 1, σ₁(n) ≤ lagariasBound n` ### Status The statements are complete and use existing Mathlib primitives: - `ArithmeticFunction.sigma` for σ₁ - `Real.eulerMascheroniConstant` for γ - `harmonic` for H_n (with ℚ → ℝ coercion) - `RiemannHypothesis` from `Mathlib.NumberTheory.LSeries.RiemannZeta` The proofs are currently `sorry`. The Robin direction (RH → inequality) requires analytic number theory following Robin's original 1984 paper. The converse uses Gronwall's theorem on superior highly composite numbers. Both are substantial Mathlib projects in their own right. This PR establishes the formal statements as a foundation for future proof work. These equivalences are not currently formalized anywhere in Mathlib. ### References - G. Robin, Grandes valeurs de la fonction somme des diviseurs et hypothèse de Riemann, J. Math. Pures Appl. 63 (1984), 187–213. - J. Lagarias, An elementary problem equivalent to the Riemann hypothesis, Amer. Math. Monthly 109 (2002), 534–543. ### Note on `sorry` I'm aware Mathlib does not merge `sorry`-laden PRs in general. I'm submitting this as a draft to: 1. Get feedback on whether the statement formulation is idiomatic 2. Establish that these statements don't already exist in Mathlib under a different name 3. Invite collaboration on completing the proofs	t-number-theory new-contributor	98/0	Mathlib/NumberTheory/LSeries/RobinInequality.lean	1	2	['github-actions']	nobody	45-84073 1 month ago	unknown	0-0 0 seconds
36937	Yaohua-Leo author:Yaohua-Leo	feat(Algebra/Jordan): add first linearization lemmas for IsCommJordan	[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) AI assistance disclosure: I used AI assistance for CI/debugging and module-structure fixes in this PR. The mathematical content and main lemmas were written by me, with help from @pelicanhere. This PR adds a new file `Mathlib/Algebra/Jordan/Linearization.lean` containing linearization lemmas for the commutative Jordan identity. Main declarations: * `IsCommJordan.four_nsmul_associator_mul_add` * `IsCommJordan.associator_mul_add` These lemmas formalize a first linearization of the commutative Jordan identity using `associator`, following McCrimmon, Proposition 1.8.5. --- I put these lemmas in a separate file because I expect follow-up linearization lemmas to belong naturally in the same place. I am also happy to rename declarations or move the file if reviewers would prefer.	t-algebra new-contributor awaiting-author label:t-algebra$	60/0	Mathlib.lean,Mathlib/Algebra/Jordan/Linearization.lean	2	6	['Yaohua-Leo', 'github-actions', 'grunweg', 'ocfnash']	ocfnash assignee:ocfnash	45-63420 1 month ago	45-63420 45 days ago	13-10710 13 days
36813	AlexeyMilovanov author:AlexeyMilovanov	feat(Computability.Encoding): add self-delimiting unary and pair encodings	Adds `unaryPrefix` (a self-delimiting $1^n 0$ code) and `prefixPair` to `Mathlib.Computability.Encoding`. Key changes: * `unaryPrefix`: A prefix-free unary encoding for $\mathbb{N}$, distinct from the existing `unaryEncodeNat`. * `unaryPrefix_append_inj`: A basic cancellation lemma that allows unique extraction of a unary prefix from a concatenated list. * `prefixPair`: A self-delimiting pairing function for boolean lists, defined as $\text{unaryPrefix } \|x\| \frown x \frown y$. * `prefixPair_inj`: A concise proof of pair injectivity leveraging the new prefix lemmas.	t-computability new-contributor awaiting-author	56/1	Mathlib/Computability/Encoding.lean	1	2	['Komyyy', 'github-actions']	Komyyy assignee:Komyyy	45-4441 1 month ago	45-4441 45 days ago	16-42277 16 days
37644	matthunz author:matthunz	feat(Order/Causal): add `Causal` ordering for stream functions	Adds `Causal` ordering for stream functions and related theorems: ```lean def Causal (f : Stream' α → Stream' β) : Prop := ∀ (x y : Stream' α) (t : ℕ), (∀ s, s ≤ t → x s = y s) → f x t = f y t ``` A stream function is causal if the output at time `t` depends only on inputs up to time `t`. Causal stream functions are commonly used in signal processing, reactive systems, and semantics of stateful computations, where outputs cannot depend on future inputs. ## Future work - Mealy machines: define Mealy machines as causal stream functions with state, and relate them to standard automata-theoretic constructions. - Feedback and delay operators: formalize feedback loops and delayed composition, enabling modeling of stateful and recursive stream definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	79/0	Mathlib.lean,Mathlib/Order/Causal/Basic.lean,Mathlib/Order/Causal/Defs.lean	3	2	['github-actions']	nobody	44-29904 1 month ago	unknown	0-0 0 seconds
37695	Morten-Ness author:Morten-Ness	refactor(GroupTheory/Complement): simplify complement proofs	Simplifies the proofs of: - `Subgroup.IsComplement'.symm` - `Subgroup.isComplement_singleton_left` - `Subgroup.isComplement_singleton_right` No API changes. AI assistance: I used Codex/LLM suggestions as a starting point, then manually checked the proofs, and verified the final version locally. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor awaiting-author	15/17	Mathlib/GroupTheory/Complement.lean	1	4	['github-actions', 'tb65536']	tb65536 assignee:tb65536	41-71594 1 month ago	41-71594 41 days ago	0-68801 19 hours
37489	michael-novak-math author:michael-novak-math	feat: add the fundamental theorem of plane curves	We add to the PlaneCurves file created in PR #36731 a classical result in the subject of differential geometry of plane curves: the fundamental theorem of plane curves. --------- - [ ] depends on: #36731	new-contributor t-differential-geometry t-analysis blocked-by-other-PR	651/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/PlaneCurves.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	5	['github-actions', 'mathlib-dependent-issues', 'michael-novak-math']	nobody	41-62174 1 month ago	47-47030 47 days ago	0-13581 3 hours
37281	AltSoKoly author:AltSoKoly	Update EdgeConnectivity.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	123/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Data/Int/GCD.lean	2	5	['github-actions', 'grunweg', 'themathqueen']	nobody	40-50785 1 month ago	52-41548 52 days ago	0-432 7 minutes
37111	tannerduve author:tannerduve	feat(Computability): add Nat.PrimrecIn and PrimrecIn	- Add `Nat.PrimrecIn`: primitive recursive functions relative to a set of oracles - Add `PrimrecIn`: lifts `Nat.PrimrecIn` to `Primcodable` types A `PrimrecIn` version of `RecursiveIn.iff_nat` (i.e., `PrimrecIn O (f : ℕ → ℕ) ↔ Nat.PrimrecIn O f`) is left as future work as it requires proving `Nat.PrimrecIn O Nat.pred`, which needs additional API for `Nat.PrimrecIn`. --- Split out from #34937 as requested in review. - [x] depends on: #37061	t-computability new-contributor awaiting-author	24/0	Mathlib/Computability/RecursiveIn.lean	1	14	['Komyyy', 'bryangingechen', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tannerduve']	nobody	38-29298 1 month ago	39-42157 39 days ago	1-79421 1 day
36763	alok author:alok	refactor(Order/Filter/Germ): partial sections for Filter.Product	## Summary - Refactor `Filter.Product` from total functions to partial sections (`Product.Section`) with filter-large domains - Adapt the model-theoretic `Prestructure` and Łoś's theorem proofs to partial sections - Add `Germ ↔ Product` bridge equivalence for constant families ## Motivation The current `Filter.Product` is a quotient of total functions `(a : α) → ε a` by eventual equality. This requires all fibers to be inhabited, which is not the mathematically correct construction. The ultraproduct should only require a section defined on a filter-large set. The new `Product.Section` structure carries: - A domain `dom : Set α` with `dom ∈ l` - A dependent section `val : (a : dom) → ε a` Two sections are equivalent if they agree on some filter-large common domain. This matches the standard mathematical construction and enables proper ultraproducts where some fibers may be empty. ## Changes ### `Mathlib/Order/Filter/Germ/Basic.lean` - New `Product.Section` structure (partial section with filter-large domain) - `productSetoid` redefined over `Product.Section` - `Product.ofTotal` embeds total sections; `eq_iff_ofTotal` characterizes equality ### `Mathlib/ModelTheory/Ultraproducts.lean` - `sectionStructure`: first-order structure on partial sections (funMap restricts to domain intersection, RelMap checks on common domain) - `setoidPrestructure` adapted with full proofs of `fun_equiv` and `rel_equiv` - `funMap_cast`, `boundedFormula_realize_cast` (rel case), `all` quantifier case all reproved for partial sections - Łoś's theorem statement unchanged; `sentence_realize` still has the same API ### `Mathlib/Order/Filter/Germ/Product.lean` (new) - `Germ.toProduct` / `Product.toGerm`: round-trip between germs and constant-family products - `Germ.prodEquiv`: equivalence for inhabited constant families (backward compat) ## Test plan - [x] `lake build` passes (7607/7607 modules) - [x] All linter warnings resolved - [x] `Mathlib.ModelTheory.Satisfiability` (uses `Filter.Product` + `sentence_realize`) still compiles - [x] `Mathlib.Analysis.Real.Hyperreal` still compiles --- Context: [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Nonstandard.20Analysis/near/513178715) — Violeta Hernández asked for fixing the ultraproduct definition as the first step after #33650 deprecated the old hyperreal machinery. 🤖 Generated with [Claude Code](https://claude.com/claude-code)	new-contributor merge-conflict	278/49	Mathlib.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Filter/Germ/Product.lean	4	5	['alok', 'github-actions', 'mathlib-merge-conflicts', 'plp127']	nobody	38-23342 1 month ago	unknown	0-0 0 seconds
37954	jdhart81 author:jdhart81	feat(Data/ENNReal/Inv): add ENNReal.div_mul_div_cancel	Proves a / b * (b / c) = a / c for b ≠ 0, b ≠ ∞ in ENNReal. Proof via mul_div_assoc and existing div_mul_cancel. AI Disclosure: This PR was developed with assistance from an LLM (Claude, Anthropic) for proof exploration and text drafting. The proof was compiled and verified locally by the contributor, who understands the mathematical content. This lemma is extracted from a larger formalization of information-theoretic bounds (Zenodo DOI: 10.5281/zenodo.19317983). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	5/0	Mathlib/Data/ENNReal/Inv.lean	1	2	['github-actions']	nobody	36-52157 1 month ago	36-52155 36 days ago	0-75 1 minute
36770	Xmask19 author:Xmask19	feat: invariance of domain via Brouwer's fixed point theorem	Continuous and injective maps from Rn to Rn are open mappings. This is shown given Brouwer's fixed point theorem. The specific version of Brouwer's theorem assumed is that a continuous map from the closed unit ball to itself has a fixed point. It is used to show a lemma in this proof. Then assuming that invariance of domain isn't true gives a contradiction with this lemma. --- My supervisor has code for studying topological manifolds which relies on invariance of domain that can be found here: https://github.com/stevensivek/TopologicalManifolds and is planned to be submitted to Mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	617/5	Mathlib.lean,Mathlib/AlgebraicTopology/InvarianceOfDomain.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Order.lean	5	2	['github-actions']	nobody	33-36419 1 month ago	33-36395 33 days ago	0-6926 1 hour
38050	WilliamCoram author:WilliamCoram	feat: Define Newton polygons	In this file we construct a method to define newton polygons using a Stream' of `Step`'s which correspond to what you would obtain via the 'algorithm' of rotating half-planes as described in Gouvea's p-adic numbers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor	620/0	Mathlib.lean,Mathlib/NumberTheory/NewtonPolygon.lean	2	3	['github-actions', 'jcommelin']	nobody	33-26465 1 month ago	unknown	0-0 0 seconds
38113	robo7179 author:robo7179	feat(SimpleGraph/PerfectGraph): add lemma graph is perfect iff all su…	Perfect graph theorem , discussion on zulip thread: [#graph theory > Second Order Monadic Logic](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Second.20Order.20Monadic.20Logic.20for.20Graph/with/583013775) - [ ] depends on: #37680 - [ ] depends on: #37598	t-combinatorics new-contributor blocked-by-other-PR	54/0	Mathlib/Combinatorics/SimpleGraph/PerfectGraph.lean	1	3	['github-actions', 'mathlib-dependent-issues']	nobody	32-61184 1 month ago	32-62543 32 days ago	0-69 1 minute
37938	SamuelSchlesinger author:SamuelSchlesinger	feat(Probability/Posterior): Posterior PMFs and Various Lemmas	Upstreaming the probability lemmas needed in https://github.com/leanprover/cslib/pull/464.	t-measure-probability new-contributor awaiting-author	130/0	Mathlib.lean,Mathlib/Probability/ProbabilityMassFunction/Posterior.lean	2	6	['EtienneC30', 'SamuelSchlesinger', 'github-actions']	RemyDegenne assignee:RemyDegenne	32-22527 1 month ago	33-55968 33 days ago	0-4092 1 hour
38139	sidbedi author:sidbedi	chore(Algebra/MvPolynomial/Variables): golf MvPolynomial.vars_0 to rfl	--- The classical qualifier and explicit rewrite chain are unnecessary — the result holds definitionally. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	1/2	Mathlib/Algebra/MvPolynomial/Variables.lean	1	3	['github-actions', 'grunweg']	nobody	31-66987 1 month ago	31-66987 31 days ago	0-34567 9 hours
38140	sidbedi author:sidbedi	chore(Data/Analysis/Filter): golf CFilter.ofEquiv_val to rfl	--- cases F is unnecessary, the result holds definitionally. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	1/2	Mathlib/Data/Analysis/Filter.lean	1	3	['github-actions', 'grunweg']	nobody	31-66943 1 month ago	31-66943 31 days ago	0-34488 9 hours
36731	michael-novak-math author:michael-novak-math	feat: Frénet moving frame and Frénet equation for plane curves	We define the curvature function, normal vector function and the Frénet moving frame for plane curve. We also prove the Frénet equations for plane curves. A separate PR (#37489) will prove the fundamental theorem of plane curves.	new-contributor t-differential-geometry t-analysis awaiting-author	321/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/PlaneCurves.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	114	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'michael-novak-math', 'scholzhannah']	nobody	31-60924 1 month ago	44-38547 44 days ago	12-40134 12 days
37683	SabrinaJewson author:SabrinaJewson	feat(Order/OrdContinuous): every map between complete lattices that preserves sSup is a left adjoint of some Galois connection	It is already proven that the left side of a Galois connection is left-continuous; this provides the converse. --- - [ ] depends on: #37682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-order	90/136	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Tactic/Translate/ToDual.lean,Mathlib/Topology/Order/Basic.lean	6	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41551 1 month ago	43-10443 43 days ago	0-1447 24 minutes
37684	SabrinaJewson author:SabrinaJewson	feat(Topology/Order): provide lemmas linking topological continuity to order continuity	All the hard work is already done, but this just fills in a couple convenient missing pieces. --- - [ ] depends on: #37682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-topology	106/136	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Tactic/Translate/ToDual.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/IsLUB.lean,Mathlib/Topology/Order/Monotone.lean	8	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41540 1 month ago	43-10444 43 days ago	0-1299 21 minutes
37376	NoneMore author:NoneMore	feat(Topology/CantorBendixson): add iterated derived sets and perfect kernel	Define the transfinite iteration of the relative derived-set operator via `gfpApprox` and introduce the perfect kernel of a set. --- AI disclosure: Most declarations, comments, and documentation in this PR were generated with Codex. Some proofs were structurally simplified using the `/golf` command from Lean 4 Skills. I reviewed the resulting code and documentation and can vouch for all submitted content. - [ ] depends on: #37374 - [x] depends on: #37375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR t-topology	249/0	Mathlib.lean,Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean,Mathlib/Topology/CantorBendixson.lean,Mathlib/Topology/DerivedSet.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41509 1 month ago	49-49241 49 days ago	0-832 13 minutes
38154	ybenmeur author:ybenmeur	add subsingleton case to ExpChar	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	113/49	Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/PurelyInseparable/Exponent.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/SeparableDegree.lean,Mathlib/RingTheory/Trace/Basic.lean	15	2	['github-actions']	nobody	30-49309 1 month ago	unknown	0-0 0 seconds
37593	IlPreteRosso author:IlPreteRosso	refactor(Data.Finset.Antidiagonal): rename set-based defs to `setAntidiagonal`	Renames set-based `Finset.mulAntidiagonal` → `setMulAntidiagonal` (and SMul/VAdd variants) to free the `mulAntidiagonal` name for the planned `HasMulAntidiagonal` typeclass. Deprecation aliases added. Supersedes #34551	t-ring-theory new-contributor merge-conflict	178/96	Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	3	['github-actions', 'mathlib-merge-conflicts']	nobody	29-79336 29 days ago	29-79337 29 days ago	15-61521 15 days
38270	Deicyde author:Deicyde	feat(Geometry/Manifold): The Tangent Functor on `MfldCat`	A simple motivating example for PR #38223. We define the `tangentFunctor : MfldCat 𝕜 (n + 1) ⥤ MfldCat 𝕜 n` which takes any manifold to its tangent bundle and any smooth map to its pushforward. This is a standard construction in differential geometry. See: J. Lee, Smooth Manifolds, pg. 75 --- - [ ] depends on: #38223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR new-contributor	320/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/Category/MfldCat/TangentFunctor.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	29-5992 29 days ago	unknown	0-0 0 seconds
38053	ntapiam author:ntapiam	feat(Analysis/Controls): add Control functions	Add Control functions ---- This PR adds Control functions in the sense of rough paths theory (see e.g. [Friz-Victoir, Section 1.2.1](https://page.math.tu-berlin.de/~friz/master4_May6th.pdf)). They are related to p-variation norms which are the goal of #38055. I've shown most results in the above reference though those relating to 1-variation are still a work in progress. I had to add a few statements about convex functions in order to work over NNReal instead or Real, but I am not sure this is the best way to do it. The reason is that I've defined controls as taking values in NNReal (as they should). In particular there is ```lean4 theorem nnreal_of_real {f : ℝ≥0 → ℝ≥0} (hf : ConvexOn ℝ (Set.Ici 0) fun x : ℝ => (f x.toNNReal : ℝ)) : ConvexOn ℝ≥0 ⊤ f ``` which I didn't know where to put. It probably holds in more generality but I didn't check. I have also included two versions of Controls, one global and one restricted to a set. I tried to follow Mathlib conventions as best as I could but perhaps that could be improved as well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor	571/1	Mathlib.lean,Mathlib/Analysis/Controls/BoundedVariation.lean,Mathlib/Analysis/Controls/ControlOn.lean,Mathlib/Analysis/Controls/Defs.lean,Mathlib/Analysis/Convex/Function.lean,docs/references.bib	6	4	['github-actions', 'ntapiam']	nobody	28-61440 28 days ago	34-26623 34 days ago	0-52 52 seconds
37964	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Floor): weaken assumptions on theorems about `FloorRing`	This PR weakens as much assumptions as possible on theorems about `FloorSemiring` and `FloorRing`. Mainly, `IsOrderedRing` and `IsStrictOrderedRing` are weakened to just `IsOrderedAddMonoid` or removed completely from the assumptions on the theorems. Most theorems can be generalized as is or only requires a minor modification of replacing lemmas about casting naturals/integers preserving order (the likes of `Nat.cast_le`, `Int.cast_lt`, etc.) with the corresponding version for `FloorRing`. Some other lemmas require modification in the proofs, but these changes shorten the proofs. The new proof of the theorem `Int.mul_cast_floor_div_cancel_of_pos` requires an extra import. The assumption `IsOrderedAddMonoid` is required on lemmas that involve comparison + addition, and `IsOrderedRing` is required only on lemmas that involve comparison + multiplication of two non-integer elements. --- - [ ] depends on: #37714 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	349/266	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Topology/Algebra/Order/Floor.lean	9	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	27-15991 27 days ago	36-17359 36 days ago	0-3854 1 hour
37279	imalinowskip author:imalinowskip	feat(Probability): multivariate CLT (and Cramèr-Wold)	--- - [x] depends on: #36208 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author large-import	500/1	Mathlib.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/CramerWold.lean	3	10	['EtienneC30', 'github-actions', 'imalinowskip', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	RemyDegenne assignee:RemyDegenne	26-30984 26 days ago	39-56070 39 days ago	5-65208 5 days
38399	openendings author:openendings	feat: OrderHom.instOrderSupSet for LawfulSup	Currently we have `instance [CompleteLattice β] : SupSet (α →o β)`. We replace this with a mere `LawfulSup` assumption such as #38328, . TODO: - [ ] construct an `OrderSupSet` instance instead of `SupSet` --- WIP - [ ] depends on: #38328 [or other `LawfulSup`] (based on master in case something else needs this) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-order new-contributor blocked-by-other-PR	26/0	Mathlib/Order/Hom/Order.lean	1	5	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'openendings']	nobody	25-81292 25 days ago	25-84136 25 days ago	0-106 1 minute
38388	supermanG author:supermanG	feat(Combinatorics/SimpleGraph): add ballFinset with basic identities	Introduces `SimpleGraph.ballFinset`, the `Finset` companion to `SimpleGraph.ball` (#36443) on graphs with a `Fintype` vertex set, together with the basic identities `mem_ballFinset`, `ballFinset_zero`, and `ballFinset_one`. `SimpleGraph.ball` is the open metric ball `{u \| edist u c < r}` and is indexed by `ℕ∞`; `ballFinset` is typed `ℕ → Finset V` for ergonomics at cardinality-facing call sites. The classical closed-ball cardinality at radius `r`, `\|{u \| edist u c ≤ r}\|`, corresponds to `\|ballFinset v (r + 1)\|` in this setup. Opened as draft so CI can run before pinging maintainers. --- First-time Mathlib contribution — happy to adjust naming, file placement, or docstring style to match house conventions. Follow-up PRs will add cardinality envelopes (sphere cardinality, geometric-series bound, polynomial bound).	t-combinatorics new-contributor LLM-generated	68/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BallCardinality.lean	2	3	['SnirBroshi', 'github-actions']	nobody	25-47342 25 days ago	unknown	0-0 0 seconds
36853	matthunz author:matthunz	feat(CategoryTheory/Monoidal/Braded/Traced): add `TracedCategory` class	Adds a `TracedCategory` class following [A. Joyal and R. Street and D. R. Verity, Traced monoidal categories](https://www.cambridge.org/core/journals/mathematical-proceedings-of-the-cambridge-philosophical-society/article/abs/traced-monoidal-categories/2BE85628D269D9FABAB41B6364E117C8#article): ```lean /-- A traced symmetric monoidal category. -/ class TracedCategory (C : Type u) [Category.{v} C] [MonoidalCategory.{v} C] [SymmetricCategory.{v} C] where /-- The trace operator. -/ trace : ∀ {A B : C} (W : C), (A ⊗ W ⟶ B ⊗ W) → (A ⟶ B) /-- Left tightening: sliding a morphism past the trace on the left. -/ trace_naturality_left : ∀ {A A' B : C} (W : C) (f : A' ⟶ A) (g : A ⊗ W ⟶ B ⊗ W), trace W (f ▷ W ≫ g) = f ≫ trace W g := by cat_disch /-- Right tightening: sliding a morphism past the trace on the right. -/ trace_naturality_right : ∀ {A B B' : C} (W : C) (f : A ⊗ W ⟶ B ⊗ W) (g : B ⟶ B'), trace W (f ≫ g ▷ W) = trace W f ≫ g := by cat_disch /-- Sliding: an endomorphism on the feedback wire slides past the trace. -/ trace_dinaturality : ∀ {A B W : C} (f : A ⊗ W ⟶ B ⊗ W) (h : W ⟶ W), trace W (f ≫ B ◁ h) = trace W (A ◁ h ≫ f) := by cat_disch /-- Superposing: trace commutes with left tensoring by a bystander object. -/ trace_superposing : ∀ {A B : C} (C' W : C) (f : A ⊗ W ⟶ B ⊗ W), C' ◁ trace W f = trace W ((α_ C' A W).hom ≫ C' ◁ f ≫ (α_ C' B W).inv) := by cat_disch /-- Vanishing I: trace over the tensor unit is the morphism itself (up to unitors). -/ trace_vanishing_one : ∀ {A B : C} (f : A ⊗ 𝟙_ C ⟶ B ⊗ 𝟙_ C), trace (𝟙_ C) f = (ρ_ A).inv ≫ f ≫ (ρ_ B).hom := by cat_disch /-- Vanishing II: trace over a tensor product equals iterated trace. -/ trace_vanishing_two : ∀ {A B X Y : C} (f : A ⊗ (X ⊗ Y) ⟶ B ⊗ (X ⊗ Y)), trace (X ⊗ Y) f = trace X (trace Y ((α_ A X Y).hom ≫ f ≫ (α_ B X Y).inv)) := by cat_disch /-- Yanking: the trace of the braiding is the identity. -/ trace_yanking : ∀ (W : C), trace W (β_ W W).hom = 𝟙 W := by cat_disch ``` ## Motivation `TracedCategory` can be used for denoting things like electric circuits, which require a traced symmetric monoidal category for the wire graph network. ## Future work - `instance [CompactClosedCategory C] : TracedCategory C` - possible notation such as `Tr_[W] f` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author merge-conflict	237/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Braided/Traced.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Traced.lean,docs/references.bib	4	5	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'matthunz']	nobody	24-41441 24 days ago	60-31004 60 days ago	0-25956 7 hours
38344	robo7179 author:robo7179	feat(SimpleGraph/Coloring/VertexColoring): Matching is 2 colorable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	51/0	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean	1	5	['SnirBroshi', 'github-actions', 'vlad902']	nobody	23-63704 23 days ago	27-31248 27 days ago	27-31627 27 days
37006	hakii6 author:hakii6	feat(LinearAlgebra/Matrix/Block, Analysis/Normed/Algebra/MatrixExponential): add BlockTriangular.pow and BlockTriangular.exp	# Summary Add BlockTriangular.pow and BlockTriangular.exp for proving "det (exp A) = exp (trace A)" # Which part using LLM The part I used LLM is for 1. Searching duplicated theorems and lemmas I may missed (I already search them myself first). 2. Help me handle the "variables and signatures", the "letI" part, some of lemmas and theorems trivial but hard to find the true one. 3. After I finished, let them helped me check the structure match the disciplines of mathlib. 4. Check the steps PR match the disciplines of mathlib Most things above are done by me first, then let them to make sure I'm not missing something. # More context More context can be found in a topic in "# new member" in Zulip [#new members > (Matrix and NormedSpace.exp) \| det (exp A) = exp (trace A)](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/.28Matrix.20and.20NormedSpace.2Eexp.29.20.7C.20det.20.28exp.20A.29.20.3D.20exp.20.28trace.20A.29/with/580964688)	new-contributor LLM-generated t-algebra awaiting-author label:t-algebra$	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	64	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'themathqueen', 'wwylele']	themathqueen assignee:themathqueen	23-58036 23 days ago	23-58036 23 days ago	33-42047 33 days
38546	yhx-12243 author:yhx-12243	fix: universe issue in injective module	Change the definition of ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type v⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` into ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type u⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` to make it agree with `Module.Baer` and real mathematical definition, without universe issues. Since the criterion `Module.Flat` also uses `Type u` on testing modules. See discussions in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Universe.20issue.20about.20injective.20module . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-zulip label:t-algebra$	57/43	Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean,Mathlib/RingTheory/Flat/Tensor.lean,Mathlib/RingTheory/LocalProperties/Injective.lean	6	5	['github-actions', 'grunweg', 'mathlib-bors', 'wwylele']	nobody	22-28139 22 days ago	22-28150 22 days ago	0-26133 7 hours
36850	whocares-abt author:whocares-abt	feat(Combinatorics/SimpleGraph/Acyclic): deleting leaves from a tree gives a tree	Added theorem stating Deleting a leaf from a tree produces a tree.	t-combinatorics new-contributor awaiting-author	5/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['YaelDillies', 'github-actions', 'vlad902']	YaelDillies assignee:YaelDillies	21-72719 21 days ago	21-72829 21 days ago	38-73648 38 days
37774	weisbrja author:weisbrja	fix: change variables in `bicompl` to `Sort*` and add missing theorem mentioned in `bicompl` docs	[#mathlib4 > Why does Mathlib use Type* instead of Sort* in some places?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Why.20does.20Mathlib.20use.20Type.2A.20instead.20of.20Sort.2A.20in.20some.20places.3F/with/583882342) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict	6/1	Mathlib/Logic/Function/Basic.lean	1	8	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'weisbrja']	nobody	21-35846 21 days ago	21-35847 21 days ago	19-76858 19 days
37445	edwin1729 author:edwin1729	feat(Topology/Order): set of compact elements, generating basic opens contained in a `Locale.PT`, is directed	This is (2/4) PRs culminating in a proof that "Scott Topologies over Algebraic DCPOs are Sober". In this PR we prove properties of a certain set of compact elements, w.r.t a `Locale.PT`. A `Locale.PT` can be thought of as a set of `Opens`. Precisely it is a Frame homomorphism from `Opens _` to `Prop` so we are essentially choosing certain `Opens` to form our set and this set has additional properties. Namely it is a completely prime filter: if the supremum of some Opens is contained than atleast one of the Opens must be contained. Take some `Locale.PT`, `x`. In this PR, we prove that the set of compact elements generating basic opens (compact elements generate topological basis see #31662) contained in `x` is directed. This set of compact elements defined above is important in subsequent parts of the proof since it fully determines `x`. - [ ] depends on: #31662 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR new-contributor merge-conflict	296/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18768 21 days ago	48-43246 48 days ago	0-463 7 minutes
37556	edwin1729 author:edwin1729	feat(Topology/Order): Locale.localePointOfSpacePoint if we have a Scott Topology from an Algebraic DCPO	(3/4) in a series of PRs proving that "Scott Topologies over Algebraic DCPOs are Sober" We prove here that the unit of the adjunction from `TopCat` to `Locale` defined in `Topology/Order/Category/FrameAdjunction.lean` is a surjective mapping, under the following condition: The underlying TopologicalSpace must be a Scott Topology generated with an underlying Algebraic DCPO structure. - [ ] depends on: #37445 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor blocked-by-other-PR merge-conflict	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18767 21 days ago	46-43267 46 days ago	0-1300 21 minutes
38027	8e7 author:8e7	feat(Combinatorics/SimpleGraph/Star): define star graphs	Add a new definition `starGraph` and several key lemmas. Star graphs are a trivial class of tree, often used in constructive proofs regarding trees. An example use case is shown in #38334. --- All lemmas are hand written first, then golfed with the help of Claude Code. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	85/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Star.lean	2	39	['8e7', 'IvanRenison', 'JovanGerb', 'SnirBroshi', 'github-actions', 'vihdzp', 'vlad902']	nobody	21-5297 21 days ago	33-5243 33 days ago	35-3501 35 days
38560	Deicyde author:Deicyde	feat(Geometry/Manifold): `MfldCat` is a `CartesianMonoidalCategory`	We prove that the category `MfldCat` of C^n manifolds is a Cartesian monoidal category, and also derive the `BraidedCategory` instance. This PR introduces a new file `Geometry/Manifold/Category/MfldCat/CartesianMonoidal` closely mirroring the structure of `Algebra/Category/Grp/CartesianMonoidal.lean` --- - [ ] depends on: #38223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR new-contributor	281/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/Category/MfldCat/CartesianMonoidal.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	20-78413 20 days ago	unknown	0-0 0 seconds
38364	openendings author:openendings	feat: create Order/DirectedCompletePartialOrder/Defs.lean	Define DirectedCompletePartialOrder and its interaction with iSup and sSup. --- A DirectedCompletePartialOrder is equivalently: - a partial order with LUBs of nonempty directed sets; - what happens when you remove ⊥ from a CompletePartialOrder; or - a ConditionallyCompletePartialOrder in which every directed set is BddAbove. Like CPOs, DCPOs are commonly studied in denotational semantics. Potential applications: - [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/590070848) -- defining infinite sums in an DCPO-enriched `AddCommMonoidWithTop` such as `ENat` or `ENNReal`. - [#Is there code for X? > Scott Induction](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Scott.20Induction/with/590112858) -- fixpoint theorems similar to `OmegaCompletePartialOrder`, generalised to arbitrary cardinalities. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	123/0	Mathlib.lean,Mathlib/Order/DirectedCompletePartialOrder/Defs.lean,docs/references.bib	3	4	['SnirBroshi', 'github-actions', 'openendings']	nobody	20-21560 20 days ago	26-11680 26 days ago	26-72899 26 days
37814	sglasman author:sglasman	feat: Equivalence between HopfAlgCat R and Hopf (ModuleCat R)	This PR resolves a TODO by demonstrating an equivalence of categories between two models of the category of Hopf algebras over a commutative ring R, that of Hopf objects in the module category of R and that of types with a `HopfAlgebra R` instance. --- AI declaration: I consulted with Claude on proof strategies. The proofs were ultimately written by me.	new-contributor large-import t-category-theory WIP	214/4	Mathlib/CategoryTheory/Monoidal/Hopf_.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean	2	5	['dagurtomas', 'github-actions', 'robin-carlier', 'sglasman']	kim-em assignee:kim-em	19-82931 19 days ago	25-45394 25 days ago	14-69757 14 days
36667	NoneMore author:NoneMore	feat(ModelTheory): add `exClosure` definition for first-order formulas	Prepare for moving realizations between elementarily equivalent structures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	37/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	2	['github-actions']	fpvandoorn assignee:fpvandoorn	19-12802 19 days ago	64-84287 64 days ago	64-84280 64 days
37682	SabrinaJewson author:SabrinaJewson	refactor(Order/OrdContinuous): redefine left and right order continuity to not require preserving ⊥/⊤	`LeftOrdContinuous` currently requires that `f ⊥ = ⊥`, but this means that many functions that are perhaps intuitively left-continuous (like `f x = x + 1` on `ℝ≥0`) are not. In particular, this change means that functions between conditionally complete lattices are `LeftOrdContinuous` iff they are monotone and topologically left continuous (see `MonotoneOn.map_csSup_of_continuousWithinAt` for the reverse direction). If one wants the concept that existed before, one can either accept the `f ⊥ = ⊥` hypothesis separately or, if the function is between complete lattices, use the left side of a `GaloisConnection` (which is equivalent, although I think this is not yet in Mathlib). This removes the definitional equality of the type in favour of a structure. Since most of the time users will be working with the `sSup` versions and not with `IsLUB`, I think this is justified. As a consequence, this removes the definitional equality between `LeftOrdContinuous` and `RightOrdContinuous` of the dual – the latter could be redefined to re-add this, but we do have conversion functions. `LeftOrdContinuous.continuousWithinAt_Iic` is rewritten to accomodate these changes; the superfluous `DenselyOrdered` assumption is also removed. [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/LeftOrdContinuous.20requires.20f.28.E2.8A.A5.29.20.3D.20.E2.8A.A5/near/582932491) --- - [x] depends on: #37735 - [x] depends on: #37772 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	52/38	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	10	['SabrinaJewson', 'astrainfinita', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	bryangingechen assignee:bryangingechen	19-12796 19 days ago	39-21694 39 days ago	41-18796 41 days
38635	Fieldnote-Echo author:Fieldnote-Echo	chore(scripts): handle simple to_additive deprecations	Closes #38550. This updates `scripts/add_deprecations.sh` so that, when a renamed declaration is near an existing `@[to_additive]` attribute, the script also emits the additive deprecation alias in the common default-name case. For example, `foo_mul -> bar_mul` now produces: ```lean @[deprecated (since := "...")] alias foo_add := bar_add @[to_additive existing, deprecated (since := "...")] alias foo_mul := bar_mul ``` This is intentionally conservative and text-based, matching the existing script. It handles common name translations such as mul/add, prod/sum, one/zero, inv/neg, and div/sub, and skips cases that look like they need less common to_additive name generation. Tested with a local six-case fixture and a scratch Lean file confirming that the generated alias form compiles and produces deprecation warnings for both names. I opened this as draft because I still count as a new contributor under the LLM-assisted PR policy. I have one merged mathlib PR (#36443), and this is a one-file script patch that I reviewed/tested manually. I'll leave it as draft unless a maintainer gives it the green light to flip ready. I used Claude assistance while drafting and testing the patch. I reviewed the final diff manually and tested the generated Lean form locally.	CI new-contributor	121/10	scripts/add_deprecations.sh	1	4	['Fieldnote-Echo', 'SnirBroshi', 'github-actions']	kim-em assignee:kim-em	18-84026 18 days ago	unknown	0-0 0 seconds
38390	mortarsanjaya author:mortarsanjaya	feat(Data/Nat/Cast/Order/Basic): introduce new class `IsMonotoneNatCast`	The class says that `Nat.cast` is monotone in an `AddMonoidWithOne`. Basically, we use this class when we only care about comparing the elements of a monoid that comes from the `Nat`s (so we do not have to care about the compatibility between the additive structure of the monoid and its order structure). --- Other than that, I'm also reorganizing some section naming, and I change the proof of the `Nontrivial` instance at the bottom to using `NeZero.nontrivial`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	28/18	Mathlib/Data/Nat/Cast/Order/Basic.lean	1	7	['github-actions', 'leanprover-radar', 'mathlib-bors', 'mortarsanjaya', 'vihdzp']	nobody	18-22729 18 days ago	18-22730 18 days ago	7-85443 7 days
37819	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): add `OmegaCompletePartialOrder` instance for `WithBot` with basic `ωScottContinuous` lemmas	This is a modification of #34093. See #34093 for details. --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	337/10	Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot.lean	6	5	['Komyyy', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	17-86307 17 days ago	17-86307 17 days ago	22-11204 22 days
38056	Deicyde author:Deicyde	feat: topological vector bundle homomorphisms	This PR implements topological vector bundle morphisms. - [ ] depends on: #38023 - [ ] depends on: #37946 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict	805/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Morphism.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-32152 17 days ago	unknown	0-0 0 seconds
38316	tannerduve author:tannerduve	feat(Order/OmegaCompletePartialOrder): least fixed point and Scott induction	Adds `ContinuousHom.lfp` for endomorphisms on an ωCPO with `⊥`, as the `ωSup` of the iterate chain from `⊥`, together with `map_lfp`, `isFixedPt_lfp`, `lfp_le_fixed`, `isLeast_lfp`, and the Scott induction theorem `lfp_induction` (specialized from a more general seed-based `ωSup_iterate_induction`). For `Part.fix`, adds: * `Part.exists_mem_approx_of_mem_fix`: if `y ∈ Part.fix g x`, some finite approximation of `g` already contains `y`. * `Part.Fix.approx_eq_iterate_bot` and `Part.Fix.approxChain_eq_iterateChain`: bridges between `Fix.approx`/`approxChain` and `f^[n] ⊥`/`iterateChain`. * `Part.fix_eq_lfp`: `Part.fix g = ContinuousHom.lfp (.ofFun g hc)` when `g` is ω-Scott continuous. * `Part.fix_scott_induction`: Scott induction specialized to `Part.fix`. * `Part.fix_induction_mem`: membership induction on `Part.fix`, derived from `fix_scott_induction`.	new-contributor	114/0	Mathlib/Control/LawfulFix.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,docs/references.bib	3	2	['github-actions']	nobody	16-38040 16 days ago	28-14142 28 days ago	28-14661 28 days
38871	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph): add parity lemmas for outer and inner vertices	Adds three lemmas to `SimpleGraph.DegreeSum`: - `sum_degrees_option_zmod_two`: the handshaking lemma for `Option I` over ZMod 2 - `degree_none_zmod_two_eq_sum`: simp-normal form of the above - `card_degree_one_option_eq_outer_zmod_two`: under degree bound ≤ 2, count of degree-1 inner vertices equals outer vertex degree mod 2	t-combinatorics new-contributor	65/3	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	6	['0xTerencePrime', 'SnirBroshi', 'github-actions']	nobody	15-1125 15 days ago	15-57753 15 days ago	15-57746 15 days
38897	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SetFamily): formalize 1D Sperner's Lemma parity	Formalizes the 1-dimensional Sperner's Lemma (parity version): given a coloring of the `n + 1` vertices of a subdivided line segment with two colors (`ZMod 2`), if the two endpoints have different colors, then the number of color-changing edges is odd. This is distinct from `IsAntichain.sperner` in `SetFamily.LYM`, which concerns antichains in a power set. This file formalizes the topological/combinatorial parity statement used as the base case in higher-dimensional Sperner arguments. ## Key declarations - `SpernerColoring`: type-safe coloring via `Fin (n + 1) → ZMod 2` - `edgeDiff`: color difference on adjacent vertices, computed in `ZMod 2` - `totalDiff`: telescoping sum of all edge differences - `diffEdges`: the `Finset` of bichromatic (color-changing) edges - `sperner_1d`: main theorem — `Odd (diffEdges c).card` ## Design notes - Using `Fin (n + 1) → ZMod 2` instead of `ℕ → ZMod 2` makes boundary conditions unrepresentable at the type level, eliminating out-of-bounds cases entirely. - The proof reduces to a telescoping sum in `ZMod 2`, using `CharTwo.add_self_eq_zero` to cancel all interior vertices, avoiding parity case splits. This is intended as the 1D base case, the approach generalizes to higher-dimensional Sperner's Lemma in future work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	133/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Sperner1D.lean	2	3	['github-actions', 'grunweg']	nobody	14-78759 14 days ago	15-2509 15 days ago	15-2502 15 days
38750	openendings author:openendings	feat(Data/Nat): add padicValNat_add_eq_min	Add lemmas for `padicValNat` mirroring the [e]multiplicity API, including - padicValNat_eq_of_dvd_of_not_dvd - padicValNat_add_of_gt - padicValNat_add_eq_min --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	36/0	Mathlib/Data/Nat/MaxPowDiv.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'openendings']	nobody	14-75784 14 days ago	15-14880 15 days ago	3-62762 3 days
38049	WilliamCoram author:WilliamCoram	feat: lemmas towards showing gaussNorm on MvPowerSeries is an absolute value	We prove lemmas: ``gaussNorm_mul_le`` and ``gaussNorm_le_mul`` which will allow us to show it is an absolute value on Mv restricted power series. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	144/1	Mathlib/RingTheory/MvPowerSeries/GaussNorm.lean	1	4	['WilliamCoram', 'github-actions']	alreadydone assignee:alreadydone	14-12964 14 days ago	34-42309 34 days ago	34-42302 34 days
38895	emlis42 author:emlis42	chore(Algebra/ContinuedFractions): golf	This PR simplifies some proofs in `Algebra/ContinuedFractions`	t-algebra new-contributor label:t-algebra$	39/63	Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean	7	2	['github-actions']	nobody	14-11475 14 days ago	14-16686 14 days ago	15-4982 15 days
37714	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Floor/Defs): `Nat.cast` is strictly monotone in `FloorSemiring` and `FloorRing`	As title says, and without the `IsOrderedRing` assumption. Other than that, I removed the `IsOrderedRing` assumption from pretty much all the lemmas in `Algebra/Order/Floor/Defs` that could possibly have this assumption removed, and reduced some `IsStrictOrderedRing` assumptions to `IsOrderedRing` + `Nontrivial`. Due to strict monotonicity, we can also provide `CharZero` instance on `FloorSemiring` and `FloorRing`. Thus we can remove the `NeZero` and `Nontrivial` instances on them. The changes on `/Ring` and `/Semiring` are trivial changes due to some lemmas not requiring an `IsOrderedRing` instance anymore. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	96/39	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean	5	24	['dagurtomas', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mortarsanjaya']	eric-wieser assignee:eric-wieser	13-83669 13 days ago	17-59440 17 days ago	41-58923 41 days
37062	tannerduve author:tannerduve	feat(Computability): Turing join and semilattice structure on Turing degrees	## Summary - Add `Partrec.kronecker` (equality test) and `Partrec.join` (disjoint union by parity) in `Partrec.lean` - Prove `Nat.RecursiveIn` is closed under computable conditionals (`cond_const`, `cond`) - Show each component reduces to the join (`left_le_join`, `right_le_join`) and the join is the least upper bound (`join_le`) - Establish `SemilatticeSup` instance on `TuringDegree`	t-computability new-contributor large-import	311/15	Mathlib/Computability/Partrec.lean,Mathlib/Computability/RecursiveIn.lean,Mathlib/Computability/TuringDegree.lean	3	7	['Komyyy', 'github-actions', 'mathlib-merge-conflicts', 'tannerduve']	Komyyy assignee:Komyyy	13-83577 13 days ago	35-48571 35 days ago	36-24458 36 days
38170	maddycrim author:maddycrim	feat(Algebra/Module/FinitePresentation): Finitely Presented Module Lemma	From FLT Project Main Definitions: `Module.FinitePresentation.exists_fin_exact` : A finitely presented module M admits an exact sequence F' -> F -> M -> 0 where F' and F are finite free modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	9/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	17	['chrisflav', 'github-actions', 'maddycrim', 'themathqueen', 'vlad902']	nobody	13-74115 13 days ago	13-74115 13 days ago	17-43852 17 days
38951	thomaskwaring author:thomaskwaring	feat(Order/PrimeSeparator): remove unnecessary hypotheses	In `mem_ideal_sup_principal`, boundedness and distributivity were unused, and in `prime_ideal_of_disjoint_filter_ideal`, boundedness was only used to produce an element of the filter `F`, which is already nonempty by definition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	9/19	Mathlib/Order/PrimeSeparator.lean	1	2	['github-actions']	nobody	13-71450 13 days ago	13-71537 13 days ago	13-71530 13 days
36896	PieterCuijpers author:PieterCuijpers	feat (Algebra/Order/Quantale): isMulLeftsided, isMulRightsided, isMulTwosided and strict versions	* Adding definitions of quantale elements being leftsided, rightsided, and twosided, and strict versions Should we include these definitions in the main Algebra/Order/Quantale.lean file, or start a separate file for them? I have a few basic theorems I would like to include on these notions, but invite suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	81/1	Mathlib/Algebra/Order/Quantale.lean	1	5	['NoahW314', 'PieterCuijpers', 'chrisflav', 'github-actions']	mariainesdff assignee:mariainesdff	13-55260 13 days ago	20-47515 20 days ago	39-18222 39 days
38669	dannyply author:dannyply	feat(Topology/Algebra/PontryaginDual): prove compact monoids have discrete duals	Proves that the Pontryagin dual of a compact monoid is discrete. As a consequence, it also adds the corresponding finite-type instances for compact discrete monoids. This upstreams a result first added downstream in [`YaelDillies/APAP`](https://github.com/YaelDillies/APAP), where this fact was needed to close a `sorry`. The proof separates the trivial character from all the others using the right half of the circle and adds a few reusable `Circle` helper lemmas near the existing related API. The original APAP proof was AI-assisted and then reviewed/rewritten during downstream review. For this PR, I used Codex to help adapt the APAP proof to mathlib and to refactor the supporting lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author	130/16	Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/PontryaginDual.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	27	['dannyply', 'github-actions', 'j-loreaux', 'tb65536']	j-loreaux assignee:j-loreaux	13-40345 13 days ago	19-41247 19 days ago	0-75079 20 hours
38973	hyeoniuwu author:hyeoniuwu	feat(Computability): define (single oracle) turing reducibility, relate it to RecursiveIn and prove basic jump theorems	feat(Computability): define (single oracle) Turing reducibility, relate it to RecursiveIn and prove basic jump theorems Defines Turing reducibility and the jump operator, with total functions (from naturals to naturals) as oracles. Defines codes for basic primitive recursive functions, and the evaluation function. Proves basic reducibility arguments, such as `K0_eq_K` asserting that K0 of an oracle is Turing equivalent to K of an oracle. Our reducibility is related back to `RecursiveIn` as is currently defined in Mathlib via the theorem `SingleReducibleIff`. This is part of a larger repository where more advanced theorems such as KP54 have been proven. (https://github.com/hyeoniuwu/CiL) Co-authored-by: Tanner Duve --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author	4988/0	Mathlib/Computability/SingleOracle/Basic.lean,Mathlib/Computability/SingleOracle/Constructions/Basic.lean,Mathlib/Computability/SingleOracle/Constructions/CovRec.lean,Mathlib/Computability/SingleOracle/Constructions/Dovetail.lean,Mathlib/Computability/SingleOracle/Constructions/Eval.lean,Mathlib/Computability/SingleOracle/Constructions/Eval_Aux.lean,Mathlib/Computability/SingleOracle/Constructions/List.lean,Mathlib/Computability/SingleOracle/Constructions/Meta.lean,Mathlib/Computability/SingleOracle/Constructions/Option.lean,Mathlib/Computability/SingleOracle/Constructions/Primitive.lean,Mathlib/Computability/SingleOracle/Encoding.lean,Mathlib/Computability/SingleOracle/Jump.lean,Mathlib/Computability/SingleOracle/Oracle.lean,Mathlib/Computability/SingleOracle/Order.lean,Mathlib/Computability/SingleOracle/RecursiveIn.lean,Mathlib/Computability/SingleOracle/Reducibilities.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Tactic/Attr/Register.lean,Mathlib/Tactic/Computability/Basic.lean	19	3	['github-actions', 'grunweg']	nobody	13-26592 13 days ago	unknown	0-0 0 seconds
37456	Robertboy18 author:Robertboy18	feat(LinearAlgebra/AffineSpace): add parallel form of Desargues's theorem	This PR adds an affine parallel form of Desargues's theorem, corresponding to entry `87` of the Lean community “100 theorems” list and following the related Rocq/Coq affine-geometry statement. Main changes - New file `Mathlib/LinearAlgebra/AffineSpace/Desargues.lean` with `parallel_third_side_of_perspective`. - Add the corresponding `public import` to `Mathlib.lean`. - Update `docs/100.yaml` entry `87` with a note that this is the parallel affine form. Proof idea The proof compares side vectors using `exists_eq_smul_of_parallel` for the two given pairs of parallel sides. The shared comparison along `SA` forces the same scalar, which gives parallelism of the third pair of sides. Tests: `lake build Mathlib.LinearAlgebra.AffineSpace.Desargues` AI disclosure: GPT-5.2 Pro was used for assistance with web search/background details about the theorem and for finding useful existing Mathlib lemmas. The theorem statement and Lean formalization were written and checked by hand. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author LLM-generated label:t-algebra$	133/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Desargues.lean	2	17	['Robertboy18', 'SnirBroshi', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	13-23230 13 days ago	39-51378 39 days ago	8-72313 8 days
38792	openendings author:openendings	wip, chore: rename Directed -> Predirected [please-adopt]	This incomplete PR renames `Directed` to `Predirected`. As [discussed in Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20complete.20partial.20order.20and.20domain.20theory.20formalization/near/592156927), `Directed` misleadingly mismatches the literature. (The literature says a directed set is nonempty, and we do not.) #### f19d3e79 Rename Directed -> Predirected (class + namespace) Automated changes: - LSP code action renaming `Directed` to `Predirected` - with the affected 69 files open in [lean.nvim](https://github.com/julian/lean.nvim), a series of commands roughly equivalent to ```nvim :bufdo :silent %s/$theorem \\|lemma \\|to_dual $Directed\>/\1Predirected/ge :bufdo :silent %s/\\./Predirected./ge :bufdo :w ``` EDIT: manual changes - one `namespace Directed` replaced. ### Corners cut: - line-length linting has not been resolved. - no snake-cased `directed` has been renamed. - only tested via `lake build --old`, plus maybe ten minutes of `lake build` before I (@openendings ) got bored and wanted my CPU back. --- WIP please-adopt t-order [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt new-contributor WIP merge-conflict	196/195	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Membership.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/Data/Finset/Order.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Lattice/Image.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Sub.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/ModelTheory/Satisfiability.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompletePartialOrder.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Directed.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Independence/Kernel/Indep.lean,Mathlib/Probability/Independence/ZeroOne.lean,Mathlib/Probability/Kernel/Disintegration/CDFToKernel.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Category/TopCat/Limits/Konig.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/CompactSystem.lean,Mathlib/Topology/Compactness/CountablyCompact.lean,Mathlib/Topology/Semicontinuity/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/Separation/Profinite.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	69	7	['github-actions', 'kbuzzard', 'mathlib-merge-conflicts', 'openendings']	nobody	13-18619 13 days ago	unknown	0-0 0 seconds
38960	ajhendel author:ajhendel	chore: remove ℕ+ interval_cases workaround in ADEInequality	`interval_cases` now supports `ℕ+`, so the manual `Finset.mem_Iio`/`Finset.mem_Ico` + `conv` + `fin_cases` workaround (marked with a porting note) is no longer needed. Replaces three 3-4 line workaround blocks with `interval_cases p`/`q`/`r`.	t-number-theory new-contributor awaiting-CI	3/10	Mathlib/NumberTheory/ADEInequality.lean	1	2	['github-actions']	nobody	12-57811 12 days ago	13-58743 13 days ago	0-105 1 minute
37718	SabrinaJewson author:SabrinaJewson	feat(Order): add conversions from `Std` order typeclasses to Mathlib ones	`{Preorder, PartialOrder, LinearOrder}.ofStd` exist to facilitate convenient translation from `Std` order typeclasses to Mathlib ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	366/0	Mathlib.lean,Mathlib/Order/Std.lean,MathlibTest/OrderOfStd.lean	3	2	['github-actions']	nobody	12-13670 12 days ago	42-16581 42 days ago	42-17067 42 days
38310	ZRTMRH author:ZRTMRH	feat(Combinatorics/Quiver/Schreier): word evaluation and reachability	Adds word evaluation and reachability results to the Schreier graph API. * `SchreierGraph.evalWord` : evaluates a word `List (S × Bool)` as an element of the ambient group, where `(s, true)` contributes `ι s` and `(s, false)` contributes `(ι s)⁻¹`. * `SchreierGraph.evalWord_eq_lift` : agreement with `FreeGroup.lift`. * `SchreierGraph.evalWord_mem_closure` : every word evaluates into the subgroup generated by `ι`. * `SchreierGraph.pathFromWord` : a Bool-tagged word yields a path in `Symmetrify (SchreierGraph V ι)` from `x` to `evalWord ι w • x`. * `SchreierGraph.reachable_iff` : two vertices are connected by a path in the symmetrification iff some element of the subgroup closure carries one to the other. Follow-up to #36320. This PR was written with AI assistance (Claude). The code has been reviewed by the author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics large-import LLM-generated	157/0	Mathlib/Combinatorics/Quiver/Schreier.lean	1	2	['github-actions']	nobody	11-85465 11 days ago	28-32539 28 days ago	28-32532 28 days
39023	TBUGTB author:TBUGTB	feat(Algebra/Order): API lemmas on floor and abs	Co-authored-by: Etienne Marion @EtienneC30 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra brownian new-contributor label:t-algebra$	9/0	Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Ring/Abs.lean	2	3	['TBUGTB', 'github-actions']	nobody	11-67191 11 days ago	11-70380 11 days ago	11-70373 11 days
38374	idontgetoutmuch author:idontgetoutmuch	Principal Bundles, Connection 1-forms and the Frame Bundle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor	2017/0	Mathlib/Geometry/Manifold/Algebra/FakeFormII.lean,Mathlib/Geometry/Manifold/Algebra/PrincipalGBundle.lean,Mathlib/Geometry/Manifold/Algebra/SmoothLieExp.lean	3	2	['github-actions']	nobody	11-56408 11 days ago	unknown	0-0 0 seconds
38194	ryanncode author:ryanncode	feat(LinearAlgebra/BilinearForm): add indefinite metrics	Add the `IndefiniteMetric` structure to support vector spaces equipped with a non-degenerate, symmetric, indefinite bilinear form. Provide the algebraic foundation for indefinite inner product spaces by formalizing the metric via `LinearMap.BilinForm` and extracting its associated quadratic form without enforcing the `IsPosSemidef` typeclass. Previously, mathlib required strictly positive-definite metrics to instantiate inner product spaces (`InnerProductSpace`), which prevented the formalization of indefinite geometries without causing typeclass inference failures. Bridge this gap by isolating the symmetric bilinear form from topological and positivity constraints, allowing the library to handle generalized indefinite metric spaces safely. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	47/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/IndefiniteMetric.lean	2	4	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	nobody	11-48733 11 days ago	11-48733 11 days ago	15-56169 15 days
38527	archiebrowne author:archiebrowne	feat(Analysis/Calculus): continuously differentiable actions	define the class `ContDiffSMul 𝕜 M X n` which asserts that the map `(c, x) ↦ c • x` is `n` times continuously differentiable on `M × X`. Many of the results are the C^n analogues of those in the module Mathlib.Topology.Algebra.MulAction.	t-differential-geometry new-contributor	317/24	Mathlib.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/ContDiffMulAction.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean	6	11	['archiebrowne', 'github-actions', 'grunweg', 'peabrainiac']	PatrickMassot and grunweg assignee:grunweg assignee:PatrickMassot	11-29452 11 days ago	11-29527 11 days ago	19-15429 19 days
39048	AydenLamp author:AydenLamp	feat(Algebra/Group/Defs): add positive natural exponentiation for semigroups	Introduce exponentiation for semigroups with positive natural exponents. This serves as a foundation for future results on Green’s relations and Rees matrix constructions in semigroups. --- Co-authored-by: Howard Straubing Soleil Repple Nathan Hart-Hodgson [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	106/0	Mathlib.lean,Mathlib/Algebra/Group/SemigroupPow.lean	2	7	['ScottCarnahan', 'github-actions', 'wwylele']	nobody	10-70582 10 days ago	11-28153 11 days ago	0-115 1 minute
38476	agusakov author:agusakov	refactor(Combinatorics/Digraph): add vertex sets	--- Adopting #33466 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	381/50	Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Digraph/Orientation.lean	2	16	['Shreyas4991', 'YaelDillies', 'agusakov', 'github-actions']	nobody	10-59926 10 days ago	19-78467 19 days ago	3-33232 3 days
38223	Deicyde author:Deicyde	feat(Geometry/Manifold): add `MfldCat`, the category of `C^n` manifolds	We define `MfldCat 𝕜 n`: the category of `C^n` manifolds over a field `𝕜`, following the pattern of `TopCat` in `Mathlib.Topology.Category.TopCat.Basic`. We also implement `HasForget₂ (MfldCat 𝕜 n) TopCat`—the forgetful functor into the category of topological spaces. For more discussion see the Zulip thread: [#PR reviews > #38223 The Category of C^n Manifolds](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/with/587038032) Also added: `ContMDiffMap.id_apply`, `.coe_id` and `.coe_comp` which are comparable to `ContinuousMap` API. ### Future work - ✅ Define a Monoidal structure via product manifolds, analogous to `Manifold.Topology.Category.TopCat.Monoidal` #38560 - ✅ Define the tangent functor: `M ↦ TM`, `F ↦ F.tangentMap` from `MfldCat (n+1) 𝕜` to `MfldCat n 𝕜` #38270 - Functor `FGModuleCat 𝕜 ⥤ MfldCat 𝕜 n` sending a finite-dimensional `𝕜`-vector space to the manifold modeled on itself. Left as `TODO`. - Define `FGModuleCat 𝕜` as an enriched category over `MfldCat n 𝕜`. Then _smooth functors_ can be realized as endofunctors on the enriched category. This is the main motivation for this construction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor t-category-theory	224/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	3	57	['Deicyde', 'chrisflav', 'dagurtomas', 'github-actions', 'idontgetoutmuch', 'peabrainiac']	kim-em assignee:kim-em	10-28422 10 days ago	10-31846 10 days ago	23-81955 23 days
37190	cjrl author:cjrl	feat(Combinatorics): Set-Valued Pigeonhole Principle	This PR contributes two theorems to combinatorics: - `exists_lt_card_cover_of_card_biUnion_lt_card` is a set-valued version of the pigeonhole principle. - `sum_card_eq_sum_card_cover_biUnion` is a set theoretic corollary of a double counting result proved for bipartite graphs (`Finset.sum_card_bipartiteAbove_eq_sum_card_bipartiteBelow`). This was needed to prove the above pigeonhole principle. The motivation for these results is our Latin Square PR #36698. These results were proved in less general terms in that PR, but are independent of Latin Square considerations and so we have generalized and moved them into more relevant files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	38/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Pigeonhole.lean	2	16	['IvanRenison', 'cjrl', 'ghseeli', 'github-actions', 'j-loreaux', 'vlad902']	b-mehta assignee:b-mehta	10-12817 10 days ago	36-33313 36 days ago	52-4105 52 days
38309	ntapiam author:ntapiam	feat(Algebra/NonAssoc): dendriform algebras	Define dendriform semirings and algebras --- This PR introduces dendriform structures such as dendriform semirings and algebras, and proves basic facts linking them to their pre-Lie counterparts. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	270/0	Mathlib.lean,Mathlib/Algebra/NonAssoc/Dendriform/Defs.lean,docs/references.bib	3	5	['dagurtomas', 'github-actions', 'ntapiam']	ocfnash assignee:ocfnash	10-12807 10 days ago	10-64985 10 days ago	25-70275 25 days
38373	Nicola9Falciola author:Nicola9Falciola	feat (Algebra/FreeAbelianGroup /Finsupp) : The support of non zero element in a freeabeliangroup is non empty	Add the lemma that for a nonzero a : FreeAbelianGroup X the support of it is non empty. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	3/0	Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean	1	7	['Nicola9Falciola', 'SnirBroshi', 'github-actions']	ocfnash assignee:ocfnash	10-12799 10 days ago	25-54942 25 days ago	26-43376 26 days
37932	idontgetoutmuch author:idontgetoutmuch	feat: Exponential map of Lie group is smooth	We construct the exponential map `expLie : g → G` for a Lie group `G` and prove that it is smooth. The main reference is: * Eckhard Meinrenken, Lie Groups and Lie Algebras, Lecture Notes, University of Toronto. Available at https://www.math.toronto.edu/mein/teaching/LectureNotes/lie.pdf --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	392/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothLieExp.lean	2	31	['github-actions', 'grunweg', 'idontgetoutmuch', 'wwylele']	nobody	9-68492 9 days ago	30-72650 30 days ago	0-973 16 minutes
39108	idontgetoutmuch author:idontgetoutmuch	feat(Geometry/Manifold/GroupLieAlgebra): Add mfderiv_mul_left_mul and left-translate for integral curves	Add the following: `mfderiv_mul_left_mul`: the derivative of left-multiplication satisfies a chain rule: $$d(L_{g \cdot h})_x = d(L_g)_{h \cdot x} \circ d(L_h)_x$$ `mulInvariantVectorField_mul`: the vector field at the translated point is the push forward of the vector field: $$V(g \cdot h) = d(L_g)_h(V(h))$$ `IsMIntegralCurve.left_translate`: using these, if $\gamma$ is an integral curve of $V$, then so is $t \mapsto g \bullet \gamma(t)$ for any $g \in G$, since: $$\frac{d}{dt}(g \bullet \gamma(t)) = d(L_g)_{\gamma(t)}\left(\frac{d\gamma}{dt}(t)\right) = d(L_g)_{\gamma(t)}(V(\gamma(t))) = V(g \bullet \gamma(t))$$ I argue () all the time with LLMs so this PR will certainly have had some input from them. Is that enough of a disclosure? () Like Lewis Carroll: In my youth said the sage I took to the law and argued each case with wife And the muscular strength that it gave to my jaw has lasted the rest of my life	t-differential-geometry new-contributor awaiting-author LLM-generated	73/0	Mathlib/Geometry/Manifold/GroupLieAlgebra.lean	1	8	['github-actions', 'grunweg']	nobody	9-38982 9 days ago	9-39047 9 days ago	0-37992 10 hours
38829	AnandGokhale author:AnandGokhale	feat(Analysis/ODE/Gronwall): added gronwall-bellman inequality	Added 2 lemmas and 1 theorem to Analysis.ODE.Gronwall, making progress towards a TODO. Lemma 1: Wrapper for Fundamental Theorem of Calculus Lemma 2: Wrapper for the continuity of an integral on a closed, ordered interval Theorem: Gronwall bellman inequality, as stated with proof in Appendix of Hassan Khalil, Nonlinear control, 3rd edition.	t-analysis new-contributor large-import	125/2	Mathlib/Analysis/ODE/Gronwall.lean	1	12	['AnandGokhale', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	j-loreaux assignee:j-loreaux	9-25978 9 days ago	10-26061 10 days ago	11-73004 11 days
38595	openendings author:openendings	chore(CategoryTheory): remove defeq abuse in Monad/Kleisli.lean	Currently most of Kleisli.lean uses defeq abuse to perform deep rewrites equivalent to `Kleisli.of_mk`, `Kleisli.mk_of`, etc. This PR removes all backward.isDefEq.respectTransparency from the file. Additionally: - Add `theorem Kleisli.comp`, encoding `Kleisli.category.map_comp` in the base category. - Add `theorem Cokleisli.comp`, encoding `category.map_comp` in the base category. - Make `C` implicit in `Monad.unit_naturality` and `Monad.mu_naturality`. - Make `C` implicit in `Comonad.counit_naturality` and `Comonad.delta_naturality`. --- - ~~I would greatly appreciate advice ([e.g. via Zulip](https://leanprover.zulipchat.com/#user/1060393)) on tackling the remainder of this file: the defeqs mostly appear in morally `simp`/`calc` proofs that look horrid in `refine` style. I can supply more rfl theorems like `of_mk` and `mk_of` (and hope to do so in subsequent PRs), but don't know how to use them for a deep type rewrite.~~ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author WIP	95/28	Mathlib/CategoryTheory/Monad/Basic.lean,Mathlib/CategoryTheory/Monad/Kleisli.lean,MathlibTest/CategoryTheory/Monad.lean	3	22	['dagurtomas', 'github-actions', 'joelriou', 'openendings']	nobody	9-10735 9 days ago	21-5525 21 days ago	0-4425 1 hour
39151	anovickis author:anovickis	feat(Analysis/CStarAlgebra/Matrix): IsTopologicalGroup for specialUnitaryGroup	Adds `ContinuousInv` and `IsTopologicalGroup` instances for `Matrix.specialUnitaryGroup n 𝕜`. The unitary group `Matrix.unitaryGroup n α` already inherits these via the `unitaryGroup ≡ unitary R` abbrev + existing instances on `unitary R` (in `Mathlib/Topology/Algebra/Star/Unitary.lean`). However, `specialUnitaryGroup` is the sub-Submonoid `unitaryGroup ⊓ MonoidHom.mker detMonoidHom` — it does not auto-inherit those instances since it is not literally an alias of `unitary R`. ### New declarations - `instance Matrix.specialUnitaryGroup.instContinuousInv` — proven via `Matrix.star_eq_inv` + `continuous_star` - `instance Matrix.specialUnitaryGroup.instIsTopologicalGroup` — combining `ContinuousMul` (from Submonoid structure) + `ContinuousInv` Both placed inside the existing `EntrywiseSupNorm` section in `Mathlib/Analysis/CStarAlgebra/Matrix.lean` (the natural neighborhood for matrix-specific topological structure on (special) unitary groups). ### Motivation These instances enable using `specialUnitaryGroup` as a topological group in homogeneous-space constructions (e.g., `SU(3) ⧸ T = F₂` flag manifolds). They complement #39146 (CompactSpace instances for the same groups) — together giving the standard 'compact topological group' typeclass set on `specialUnitaryGroup`. ### Verification \`\`\`lean example : ContinuousInv (Matrix.specialUnitaryGroup (Fin 3) ℂ) := inferInstance -- now works example : IsTopologicalGroup (Matrix.specialUnitaryGroup (Fin 3) ℂ) := inferInstance -- now works \`\`\` Both fail on master without this PR; both succeed after.	t-analysis new-contributor awaiting-author	30/0	Mathlib/Analysis/CStarAlgebra/Matrix.lean	1	3	['github-actions', 'j-loreaux', 'wwylele']	nobody	8-28106 8 days ago	8-28106 8 days ago	0-3921 1 hour
38584	TJHeeringa author:TJHeeringa	feat(Analysis/InnerProductSpace/Reproducing): Add outerKernel, mem_iff	--- Adds the `outerKernel` definition and the theorem `mem_iff`. These are needed for proving statements involving embeddings of RKHS. I can split `mem_of_posSemidef` and `mem_iff` off into a different pull request if that is preferred. The theorems `mem_of_posSemidef` and `posSemidef_of_mem` are the two directions of `mem_iff`. `posSemidef_of_mem` is slightly stronger than the converse direction of `mem_iff` in the sense that it also specifies the constant `c` in the statement. The specified `c` is in fact the smallest possible `c` for which the statement holds. The statement `mem_of_posSemidef` proves `∃ (g : H), (g : X → V) = f`. We could instead write `f ∈ (coeCLM 𝕜 (H:=H)).range`. Making this change would require the addition of the line `simp only [LinearMap.mem_range, coe_coe, coeCLM_apply]` in the beginning of the proof. The full beginning is then ``` lemma mem_of_posSemidef (f : X → V) {c : ℝ} (hc : ((c : 𝕜) ^ 2 • kernel H - outerKernel 𝕜 f).PosSemidef) : f ∈ (coeCLM 𝕜 (H:=H)).range := by simp only [LinearMap.mem_range, coe_coe, coeCLM_apply] let Laux : ... ``` Making a `MemRKHS` like MemLp and MemSobolev and then writing `MemRKHS H f` is also an option. Happy to change it to whatever is preferred. The proof of `mem_of_posSemidef` is based on the idea that any function f in the RKHS satisfies `=\sum_{n} ` for `x_n\in X` and `v_n\in V` by the reproducing property. We define the operator L(\sum_n K(\cdot,x_n)v_n) = \sum_{n} . This is bounded by the condition based on the kernels, and thus extends to a bounded linear operator on the RKHS. Its Riesz' representer agrees pointwise with f. AI: When asking how to avoid Classical.choose in constructing the operator L, Claude suggested the approach of going through the quotient. I made the proof using Claude as supplementary Loogle. Afterwards, I asked it to help shorted the proofs. Some suggestions for `mem_of_posSemidef` were applied. The other suggestions were not helping or not correct. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	122/1	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	7	['TJHeeringa', 'github-actions', 'themathqueen']	j-loreaux assignee:j-loreaux	8-12398 8 days ago	21-41293 21 days ago	21-41664 21 days
38275	TTony2019 author:TTony2019	feat: Add `AffineEquiv.image_intrinsicInterior`	## Summary This PR generalizes the existing lemma `AffineIsometry.image_intrinsicInterior` to the setting of affine equivalences, yielding the corresponding result `AffineEquiv.image_intrinsicInterior`. Since affine equivalences are more general than affine isometries, the proof requires an additional finite-dimensionality assumption. The key extra input is that in finite-dimensional spaces, an affine equivalence induces a homeomorphism via `AffineEquiv.toHomeomorphOfFiniteDimensional`, so the assumptions are adjusted accordingly. Apart from these extra assumptions, the argument is essentially the same as for `AffineIsometry.image_intrinsicInterior`. ## Collaboration This PR was developed together with @imathwy.	t-analysis new-contributor	252/41	Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/LinearAlgebra/AffineSpace/Restrict.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Homeomorph/Defs.lean	5	25	['github-actions', 'imathwy', 'j-loreaux', 'themathqueen']	j-loreaux assignee:j-loreaux	8-4705 8 days ago	8-4705 8 days ago	16-33208 16 days
38755	TJHeeringa author:TJHeeringa	feat(Analysis/innerProductSpace/GramMatrix): Add Gram.posSemidef_of_mapL	--- `Analysis/innerProductSpace/TensorProduct` has a TODO for a continuous version of `TensorProduct.map`. One place which contains a proof for this is at [stack](https://math.stackexchange.com/a/3934668). This PR is lemma 1 of that. It is written with `.PosSemidef` instead of `≤` because the Löwner Order on matrices is only defined in lean for matrices with values in `𝕜`. No AI used. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	21/0	Mathlib/Analysis/InnerProductSpace/GramMatrix.lean	1	14	['TJHeeringa', 'github-actions', 'j-loreaux', 'themathqueen']	urkud assignee:urkud	7-54860 7 days ago	7-54860 7 days ago	17-32852 17 days
39191	m13683320924-hue author:m13683320924-hue	feat: define Asymptotics.IsSubpolynomial	This PR defines `Asymptotics.IsSubpolynomial l f g`, meaning that `f` is asymptotically bounded by `1 + ‖g‖ ^ k` for some `k : ℕ`. It also adds basic closure lemmas for constants, addition, multiplication, and natural powers. Towards #32658. The formalization was developed with the help of Doubao-Seed-2.0-code and manually checked in Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	259/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean	2	3	['github-actions']	nobody	7-54064 7 days ago	7-65025 7 days ago	0-344 5 minutes
34054	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): OmegaCompletePartialOrder instance for `Sigma` with basic `ωScottContinuous` lemmas	This PR adds an `OmegaCompletePartialOrder` instance for `Sigma` along with `ωScottContinuous` lemmas for basic operations (`mk`, `fst`, `snd`). Appropriate lemmas are marked with `@[fun_prop]` so that the `fun_prop` tactic can automatically deduce `ωScottContinuous` proofs for functions involving `Sigma`s. --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order please-merge-master awaiting-author	231/0	Mathlib/Data/Sigma/Order.lean,Mathlib/Order/OmegaCompletePartialOrder.lean	2	29	['Vierkantor', 'YellPika', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	7-48816 7 days ago	87-30067 87 days ago	16-66871 16 days
39213	m13683320924-hue author:m13683320924-hue	feat: define maximal cliques and independent sets	This PR adds explicit predicates for maximal cliques and maximal independent sets: - `SimpleGraph.IsMaximalClique` - `SimpleGraph.IsMaximalIndepSet` It also adds conversion lemmas to and from the existing `Maximal G.IsClique` and `Maximal G.IsIndepSet` formulations, plus basic complement and maximum-to-maximal lemmas. Towards #34962. The formalization was developed with the help of Doubao-Seed-2.0-code and manually checked in Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	60/22	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	3	['SnirBroshi', 'github-actions']	nobody	7-33471 7 days ago	7-41300 7 days ago	0-389 6 minutes
37716	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Determinant): Desnanot-Jacobi identity	This PR adds the Desnanot-Jacobi identity (also known as the Lewis Carroll identity or Dodgson condensation): for any (n+2)×(n+2) matrix M over a commutative ring, $$\det(M) \cdot \det(M_{1,n}^{1,n}) = \det(M_1^1) \cdot \det(M_n^n) - \det(M_1^n) \cdot \det(M_n^1)$$ The proof follows Bressoud's Proofs and Confirmations (Cambridge University Press, 1999): multiply M by an auxiliary matrix built from columns of the adjugate, then compare determinants. This yields the identity premultiplied by det(M). To cancel, we pass to a universal polynomial ring (an integral domain with nonzero determinant), then specialize back to arbitrary commutative rings. It seems there's some interest in adding this: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Determinantal.20identity.20and.20the.20Cauchy.20matrix.20determinant/with/582946873 ---	t-algebra new-contributor label:t-algebra$	217/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Determinant/DesnanotJacobi.lean	2	13	['SnirBroshi', 'github-actions', 'grunweg', 'kim-em', 'slavanaprienko']	nobody	7-31404 7 days ago	7-31158 7 days ago	8-69381 8 days
32608	PrParadoxy author:PrParadoxy	feat(LinearAlgebra/PiTensorProduct): API for PiTensorProducts indexed by sets	This PR addresses a TODO item in LinearAlgebra/PiTensorProduct.lean: * API for the various ways ι can be split into subsets; connect this with the binary tensor product -- specifically by describing tensors of type ⨂ (i : S), M i, for S : Set ι. Our primary motivation is to formalise the notion of "restricted tensor products". This will be the content of a follow-up PR. Beyond that, the Set API is natural in contexts where the index type has an independent interpretation. An example is quantum physics, where ι ranges over distinguishable degrees of freedom, and where its is common practice to annotate objects by the set of indices they are defined on. --- Stub file with preliminary definition of the restricted tensor product as a direct limit of tensors indexed by finite subsets of an index type: https://github.com/PrParadoxy/mathlib4/blob/restricted-stub/Mathlib/LinearAlgebra/PiTensorProduct/Restricted.lean --- - [x] depends on: #32598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-algebra WIP label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	31	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-30650 7 days ago	147-41372 147 days ago	10-66980 10 days
37625	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Charpoly): general coefficient formula as sum of principal minors	This PR adds a general formula for the coefficients of `det(1 + X • M)` as sums of principal minors, generalizing the existing `coeff_det_one_add_X_smul_one` (k=1, trace) and `det_eq_sign_charpoly_coeff` (k=n, determinant). It also derives the corresponding formula for the coefficients of the characteristic polynomial via `charpolyRev`. New results: - `det_piecewise_one_eq_submatrix_det`: relates piecewise-with-identity to principal submatrix determinants - `coeff_det_one_add_X_smul_eq_sum_minors`: the k-th coefficient of `det(1 + X • M)` equals the sum of k×k principal minors - `charpoly_coeff_eq_sum_minors`: coefficients of the characteristic polynomial as signed sums of principal minors ---	t-algebra new-contributor ready-to-merge label:t-algebra$	105/1	Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean	1	28	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-bors', 'slavanaprienko', 'wwylele']	nobody	7-28909 7 days ago	7-85484 7 days ago	37-17965 37 days
37299	XC0R author:XC0R	feat(NumberTheory): Chebyshev's lower bound on primorial	## Summary Prove `primorial(n) ≥ 2^(n/2)` for all `n ≥ 2` (Chebyshev's 1852 lower bound). This is the lower bound complement to `primorial_le_four_pow`. Addresses the TODO at `Chebyshev.lean` line 50: "Prove Chebyshev's lower bound." ### New file: `Mathlib/NumberTheory/PrimorialLowerBound.lean` Main theorems: - `two_pow_le_primorial`: `2 ^ n ≤ primorial (2 * n)` for `n ≥ 29` - `two_pow_div_two_le_primorial`: `2 ^ (n / 2) ≤ primorial n` for `n ≥ 2` Key intermediates: - `centralBinom_le_pow_mul_primorial`: `C(2n,n) ≤ (2n)^{π(√(2n)+1)} * primorial(2n)` - `eight_mul_sq_add_le_two_pow`: `8u² + 16u + 8 ≤ 2^u` for `u ≥ 10` ### Proof technique Central binomial decomposition: from `four_pow_lt_mul_centralBinom` and `factorization_choose_le_log`, bound `C(2n,n)` above by `(2n)^{π(√(2n)+1)} * primorial(2n)`. Rearranging gives `primorial(2n) ≥ 2^n` for `n ≥ 29`. Base cases by `norm_num` + `decide`, large `n` analytically via `√n` factoring. ### AI disclosure Claude (Anthropic) was used as a coding assistant for Lean tactic exploration, file structuring, and CI debugging. All proof strategy, mathematical content, and final code have been reviewed and are understood by the author.	t-number-theory new-contributor awaiting-author	226/2	Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Primorial.lean	2	53	['MichaelStollBayreuth', 'Parcly-Taxel', 'XC0R', 'github-actions', 'mathlib-merge-conflicts', 'wwylele']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-22655 7 days ago	38-34758 38 days ago	13-62238 13 days
39225	junodeveloper author:junodeveloper	feat(SimpleGraph): add odd degree corollaries	This PR adds three small corollaries of the handshaking lemma for odd-degree vertices in `SimpleGraph`: * `card_odd_degree_vertices_ne_one` * `not_existsUnique_odd_degree` * `even_degree_of_forall_ne_even_degree` These are convenience lemmas around the existing `even_card_odd_degree_vertices` / `exists_ne_odd_degree_of_exists_odd_degree` API. Local checks: ```bash lake build Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe lint-style Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe runLinter Mathlib.Combinatorics.SimpleGraph.DegreeSum ``` ## AI usage disclosure I used OpenClaw/Codex to help explore the existing API, draft the small proofs, and run local checks. I reviewed the final code myself and understand the statements and proofs in this PR.	t-combinatorics new-contributor	21/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	2	['github-actions']	nobody	7-21131 7 days ago	7-22463 7 days ago	7-22456 7 days
38348	mirajcs author:mirajcs	feat(Geometry/Curve): add Frenet–Serret framework	--- This PR introduces a basic formalization of smooth parametrized curves in `ℝ³` (`EuclideanSpace ℝ (Fin 3)`) together with the Frenet frame and partial proofs of the Frenet–Serret formulas. Main contributions: * Define `ParametrizedDifferentiableCurve` as a smooth map on an open interval. * Define arc length and arc-length parametrization. * Define geometric quantities: - curvature `κ(t) = ‖α''(t)‖` - tangent, normal, and binormal vector fields - torsion via `‖B'(t)‖` * Introduce the `FrenetFrame` structure. * Prove key Frenet–Serret formulas: - `T' = κ • N` - `B' = -τ • N` - `N' = -κ • T + τ • B` The implementation relies on existing analysis and inner product space infrastructure, as well as properties of the cross product in `ℝ³`. Some intermediate lemmas about orthogonality and cross-product identities are included. At present, some results assume nonvanishing curvature/torsion and include auxiliary hypotheses about derivatives. These can be streamlined in future work. This development is intended as a foundation for further formalization of classical differential geometry (curves and surfaces). ---	new-contributor t-differential-geometry awaiting-author	525/0	Mathlib.lean,Mathlib/Geometry/Curves/Basic.lean,Mathlib/Geometry/Curves/FrenetFrame.lean	3	18	['bryangingechen', 'github-actions', 'mathlib-merge-conflicts', 'mirajcs', 'ocfnash', 'vihdzp', 'wwylele']	ocfnash assignee:ocfnash	7-20053 7 days ago	20-43145 20 days ago	6-55291 6 days
39162	anovickis author:anovickis	feat(Topology/PartitionOfUnity): add pointwise_decomposition_finsum + companions	Add three short lemmas to `Mathlib/Topology/PartitionOfUnity.lean` extending the existing `PartitionOfUnity` API: - `pointwise_decomposition_finsum` — for `f : X → ℝ` and `x ∈ s`, `f x = ∑ᶠ i, ρ i x · f x`. This is the pointwise step that lifts to integral linearity in measure-theoretic PoU integration: `∫_s f dμ = ∑ᶠ i, ∫_s (ρ i · f) dμ`. - `one_minus_sum_nonneg` — `0 ≤ 1 - ∑ᶠ i, ρ i x`. Direct rearrangement of the existing `sum_le_one` field; useful as a complement-mass remainder bound in chart-by-chart estimates. - `abs_le_one` — `\|ρ i x\| ≤ 1`. Combines the existing `nonneg` and `le_one`; convenience for absolute-value bounds. All three are short proofs using existing structure fields (`sum_eq_one`, `sum_le_one`, `nonneg`, `le_one`). These came up while writing chart-by-chart Stokes-on-manifold estimates where one wants to decompose `∫_M f` into chart-supported pieces using a partition of unity. The pointwise identity is the obvious first step; the other two are complementary algebraic bounds that show up in remainder estimates. --- 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-topology new-contributor LLM-generated	27/0	Mathlib/Topology/PartitionOfUnity.lean	1	2	['github-actions']	urkud assignee:urkud	7-12772 7 days ago	8-8693 8 days ago	8-8686 8 days
39212	emlis42 author:emlis42	feat(Algebra/ContinuedFractions): add `partNums!` and `partDens!`	This PR adds `partNums!` and `partDens!`, which provide infinite stream representations for the sequences of partial numerators and denominators of a generalized continued fraction.	t-algebra new-contributor label:t-algebra$	8/0	Mathlib/Algebra/ContinuedFractions/Basic.lean	1	4	['emlis42', 'github-actions', 'grunweg']	nobody	7-9733 7 days ago	7-42452 7 days ago	7-42445 7 days

PRs not into the master branch

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	2	['urkud']	nobody	127-2019 4 months ago	711-62487 711 days ago	9-15083 9 days

PRs with an 'approved' review

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Approval(s)	Updated	Last status change	total time in review
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-meta label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	1	656-74035 1 year ago	746-20054 746 days ago	0-84 1 minute
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	53/50	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	3	28	['bustercopley', 'eric-wieser', 'jcommelin', 'jjaassoonn', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	nobody	1	656-74032 1 year ago	896-39395 896 days ago	5-6524 5 days
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-topology label:t-algebra$	55/3	Mathlib.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Instances/ZMod.lean,Mathlib/Topology/Maps.lean	5	61	['YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'laughinggas', 'mo271', 'urkud']	nobody	1	656-74032 1 year ago	863-32123 863 days ago	7-11053 7 days
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	37	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel', 'vihdzp']	nobody	1	656-74031 1 year ago	931-39528 931 days ago	35-63136 35 days
6403	astrainfinita author:astrainfinita	chore: change instance priorities of `Ordered*` hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order merge-conflict slow-typeclass-synthesis awaiting-author label:t-algebra$	253/79	Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/RingTheory/HahnSeries.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	18	39	['Vierkantor', 'astrainfinita', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	1	656-74030 1 year ago	901-26772 901 days ago	13-18399 13 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	1	637-51332 1 year ago	672-57554 672 days ago	56-40668 56 days
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	1	637-40385 1 year ago	647-147 647 days ago	7-18420 7 days
13514	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): closure under union	- [ ] depends on: #15895 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	1	562-67189 1 year ago	640-41170 640 days ago	72-28417 72 days
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	2	549-73237 1 year ago	700-68873 700 days ago	63-69226 63 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	1	483-69704 1 year ago	483-69704 483 days ago	69-35596 69 days
2605	eric-wieser author:eric-wieser	chore: better error message in linarith	On this mwe: ```lean import Mathlib.Tactic.Linarith example (s : Set ℕ) (h : s = s) : 0 ≤ 1 := by linarith ``` this now indicates where the internal error is coming from. Is there a better way of chaining errors than this? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	1	473-51724 1 year ago	1120-83263 1120 days ago	51-42225 51 days
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	1	403-68086 1 year ago	536-56503 536 days ago	1-41769 1 day
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	1	377-24691 1 year ago	454-49714 454 days ago	43-80684 43 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-logic	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	1	374-42765 1 year ago	374-42765 374 days ago	46-55730 46 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	1	278-19153 9 months ago	278-19153 278 days ago	71-27957 71 days
26078	kckennylau author:kckennylau	feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves	--- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebraic-geometry	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	nobody	1	270-48769 8 months ago	270-48769 270 days ago	64-11252 64 days
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	1	252-17756 8 months ago	252-48859 252 days ago	73-43082 73 days
27937	madvorak author:madvorak	feat(Logic/Basic): `congr_heq₂`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-logic	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	1	243-68095 8 months ago	269-68880 269 days ago	17-62644 17 days
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-number-theory	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	1	234-51609 7 months ago	315-51546 315 days ago	73-10873 73 days
26330	Timeroot author:Timeroot	feat: "Junk value" test file	This PR continues the work from #25173. Original PR: https://github.com/leanprover-community/mathlib4/pull/25173	awaiting-author t-data	360/0	MathlibTest/Junk.lean	1	17	['SnirBroshi', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	2	231-8936 7 months ago	231-8936 231 days ago	48-67789 48 days
27302	tristan-f-r author:tristan-f-r	feat(Fintype/Quotient): finLiftOn₂	The combination of [`Quotient.finLiftOn`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Fintype/Quotient.html#Quotient.finLiftOn) and [`liftOn₂`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Quotient.liftOn%E2%82%82). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	19/0	Mathlib/Data/Fintype/Quotient.lean	1	12	['github-actions', 'kckennylau', 'pechersky', 'tristan-f-r', 'vihdzp']	pechersky assignee:pechersky	2	214-86096 7 months ago	214-86096 214 days ago	6-5358 6 days
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	4	['euprunin', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	1	214-81172 7 months ago	266-26569 266 days ago	0-1 1 second
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	merge-conflict awaiting-author t-algebra label:t-algebra$	67/77	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	26	20	['Vierkantor', 'alreadydone', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	1	202-71654 6 months ago	266-31827 266 days ago	2-39213 2 days
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	32	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	1	199-54910 6 months ago	278-70445 278 days ago	28-12053 28 days
9352	chenyili0818 author:chenyili0818	feat: arithmetic lemmas for `gradient`	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties Co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	31	['chenyili0818', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'winstonyin']	nobody	1	180-76748 5 months ago	818-55197 818 days ago	52-1358 52 days
11890	adomani author:adomani	feat: the terminal refine linter	A linter that warns on usages of `refine` and `refine'` as a finishing tactic. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Usage.20of.20refine'). ### Conclusion of the experiment Systematic replacements of terminal `refine` with `exact` leads to an overall slow-down. --- - [ ] depends on: #15616 (disable the linter in downstream projects) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	15	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	1	180-76617 5 months ago	643-24723 643 days ago	18-28993 18 days
20924	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity): Oracle-based computation	This PR adds the types and lemmas for oracle-based computation. In this model, computations are run on a monad which also counts the number of oracle queries executed. With it, it becomes possible to reason about the upper bound of the query complexity of algorithms. In the future, we could extend this work to include the necessary bits from information theory and probability to also reason about lower bounds on query complexity, like the work in https://github.com/girving/debate. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	60	['eric-wieser', 'girving', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao', 'tomaz1502']	nobody	1	180-76183 5 months ago	450-11078 450 days ago	27-32630 27 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	20	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	1	180-76173 5 months ago	406-4015 406 days ago	50-48893 50 days
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	35	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	1	180-76041 5 months ago	427-70054 427 days ago	20-81245 20 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	31	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	b-mehta assignee:b-mehta	1	180-76015 5 months ago	355-2886 355 days ago	71-41637 71 days
26914	quangvdao author:quangvdao	feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor`	This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence. We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute Some things I'm not clear on: - I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level? - Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation. - Need a double-check on the priority of notation. Some future definitions to add: - Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`. - Definitions of Lenses and Charts (each of them will be a file or even a folder) - Exponential objects (corresponding to both `prod` and `tensor`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	20	['alexkeizer', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao']	eric-wieser assignee:eric-wieser	1	180-75331 5 months ago	180-75332 180 days ago	133-23955 133 days
27163	pechersky author:pechersky	feat(Topology/ValuativeRel): of and to basis of compatible valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #30262	t-number-theory t-algebra merge-conflict awaiting-author t-topology label:t-algebra$	229/62	Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	73	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	1	180-75314 5 months ago	182-20705 182 days ago	84-31691 84 days
28325	pechersky author:pechersky	feat(WithZeroTopology): `locallyCompactSpace_iff_locallyFiniteOrder_units`	On the way to golf/generalize the proof that locally compact valued fields have locally finite valuation groups as embodied in `Valued.integer.locallyFiniteOrder_units_mrange_of_isCompact_integer` ] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-order large-import	81/2	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	3	13	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'ocfnash']	PatrickMassot assignee:PatrickMassot	1	180-75019 5 months ago	185-43297 185 days ago	93-41632 93 days
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	6	['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	1	180-74873 5 months ago	180-74874 180 days ago	55-54919 55 days
11800	JADekker author:JADekker	feat: KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology awaiting-zulip	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	1	180-48053 5 months ago	655-68335 655 days ago	123-25636 123 days
26310	kckennylau author:kckennylau	feat: binary forms	This PR provides the basic definition of binary forms, which are homogeneous polynomials in two variables. --- - [ ] depends on: #26312 - [ ] depends on: #26313 - [ ] depends on: #26314 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	14	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	1	180-47465 5 months ago	272-44486 272 days ago	57-1096 57 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data merge-conflict	44/22	Mathlib/Data/Int/GCD.lean	1	6	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'nomeata', 'urkud']	nobody	1	172-63273 5 months ago	324-16751 324 days ago	58-34020 58 days
28057	plp127 author:plp127	feat(SuccOrder): simp lemma to refold `Order.succ` and `Order.pred`	Adds `SuccOrder.succ_eq_succ` and `PredOrder.pred_eq_pred` to refold `SuccOrder.succ` and `PredOrder.pred` into `Order.succ` and `Order.pred`. These lemmas are marked `@[simp]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-order merge-conflict	8/2	Mathlib/Order/SuccPred/Basic.lean	1	4	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	1	164-10002 5 months ago	241-25710 241 days ago	44-13238 44 days
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	merge-conflict t-algebra label:t-algebra$	67/66	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	26	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'leanprover-bot', 'leanprover-radar', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	1	154-20638 5 months ago	175-56587 175 days ago	63-23787 63 days
32889	artie2000 author:artie2000	feat(Algebra): forgetful lemmas for `map` and `comap` on substructures	* Standardise the form of forgetful lemmas for `map` and `comap` (ie, `(co)map_toSubfoo`) * Add missing lemmas of this form * Mark all such lemmas as `simp` --- - [x] depends on: #21031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict blocked-by-other-PR label:t-algebra$	72/17	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/Subalgebra.lean	6	30	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	1	142-53011 4 months ago	152-27558 152 days ago	2-56660 2 days
33381	urkud author:urkud	feat: add a version of the Schwarz lemma	Add a version of the Schwarz lemma that is midway between the original lemma and Pick's version. Use it to show that a function that is separately holomorphic on a polydisc and is bounded on this polydisc must be continuous on it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #33368 - [x] depends on: #33362	t-analysis blocked-by-other-PR merge-conflict	475/91	Mathlib.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean	5	22	['girving', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	1	138-83444 4 months ago	140-51924 140 days ago	0-947 15 minutes
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability please-adopt	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	32	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	1	133-31618 4 months ago	580-78855 580 days ago	9-73631 9 days
25905	mans0954 author:mans0954	feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant	This PR continues the work from #25605. Original PR: https://github.com/leanprover-community/mathlib4/pull/25605	merge-conflict t-ring-theory please-adopt	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	47	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'mathlib4-merge-conflict-bot', 'ocfnash']	chrisflav assignee:chrisflav	1	128-20511 4 months ago	254-48890 254 days ago	82-4874 82 days
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	12	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	1	127-1926 4 months ago	731-57751 731 days ago	1-73101 1 day
32880	0xTerencePrime author:0xTerencePrime	feat(Analysis/Asymptotics): define subpolynomial growth	## Main definitions * `Asymptotics.IsSubpolynomial l f g`: A function `f` has subpolynomial growth with respect to `g` along filter `l` if `f = O(1 + ‖g‖^k)` for some natural `k`. ## Main results * `IsSubpolynomial.const`: Constant functions have subpolynomial growth * `IsSubpolynomial.id`: Identity has subpolynomial growth * `IsSubpolynomial.add`: Closure under addition * `IsSubpolynomial.neg`: Closure under negation * `IsSubpolynomial.sub`: Closure under subtraction * `IsSubpolynomial.mul`: Closure under multiplication * `IsSubpolynomial.pow`: Closure under powers * `isSubpolynomial_iff_one_add`: Equivalence with `(1 + ‖g‖)^k` formulation * `IsSubpolynomial.uniform`: Uniform bounds for finite families ## Implementation notes The definition uses `1 + ‖g‖^k` rather than `(1 + ‖g‖)^k` as the primary form, with the equivalence established in `isSubpolynomial_iff_one_add`. Four private auxiliary lemmas handle the key inequalities needed for closure proofs. Closes #32658	awaiting-author t-analysis new-contributor	185/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean	2	29	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	1	126-34692 4 months ago	127-16150 127 days ago	22-14560 22 days
29610	llllvvuu author:llllvvuu	feat(LinearAlgebra): define LinearMap.Eigenbasis	Some theorems are left TODO for follow-up work. The definition is from @eric-wieser ([#Is there code for X? > diagonalizable linear maps @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/diagonalizable.20linear.20maps/near/539163222)). Co-authored-by: Aristotle Harmonic --- - [x] depends on: #29420 (golfs some `[Nontrivial R]` assumptions) - [x] depends on: #29791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author label:t-algebra$	455/5	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/LinearAlgebra/Eigenbasis.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/Order/CompleteLattice/Basic.lean	5	31	['github-actions', 'joelriou', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	1	124-40335 4 months ago	180-74271 180 days ago	20-33900 20 days
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology infinity-cosmos t-meta please-adopt will-close-soon	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	24	['eric-wieser', 'gio256', 'github-actions', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1	122-51277 4 months ago	302-28417 302 days ago	88-84229 88 days
28796	grunweg author:grunweg	feat: immersions are smooth	The conventional textbook definition demands that an immersion be smooth. When asking for the immersion to have local slice charts (as we do), this implies smoothness automatically. --- - [x] depends on: #28701 - [x] depends on: #28793 - [x] depends on: #30356 - [x] depends on: #28853 (for simplicity) - [x] depends on: #36816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author merge-conflict	192/21	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	6	57	['chrisflav', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	PatrickMassot assignee:PatrickMassot	1	120-39251 4 months ago	123-40105 123 days ago	0-1863 31 minutes
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [x] depends on: #24570 - [x] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author please-adopt	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	21	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1	115-71012 3 months ago	367-45345 367 days ago	43-17409 43 days
34273	gasparattila author:gasparattila	feat(Topology/Sets): finite sets are dense in `(Nonempty)Compacts`	--- - [x] depends on: #34266 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	182/0	Mathlib/Topology/Sets/VietorisTopology.lean	2	4	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'scholzhannah']	ADedecker assignee:ADedecker	1	110-55103 3 months ago	55-43045 55 days ago	55-44288 55 days
34092	staroperator author:staroperator	feat(SetTheory/ZFC): properties of `ZFSet.omega`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	77/10	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	31	['Komyyy', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	YaelDillies assignee:YaelDillies	1	109-35517 3 months ago	21-73649 21 days ago	99-2887 99 days
34633	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define the Zarankiewicz function	Defines the Zarankiewicz function $z(m, n; s, t)$ in terms of bipartite graphs. --- - [x] depends on: #34632 This comes from splitting up #25841 into smaller PRs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge blocked-by-other-PR	247/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	4	30	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner']	nobody	1	107-3470 3 months ago	8-17059 8 days ago	53-35263 53 days
34271	gasparattila author:gasparattila	feat(Topology/Sets): second-countability of `(Nonempty)Compacts`	--- - [x] depends on: #34266 - [x] depends on: #34268 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	308/93	Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sets/VietorisTopology.lean	5	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'scholzhannah']	urkud assignee:urkud	1	106-25008 3 months ago	10-29835 10 days ago	47-38731 47 days
33493	michelsol author:michelsol	feat(RingTheory/Polynomial): An explicit formula for the Chebyshev polynomials of the first kind	Adds the following explicit formula on the Chebyshev polynomial of the first kind of order n. ${ T_{n}(x)\ =\ \sum \limits _{k=0}^{\lfloor {\frac {n}{2}}\rfloor } {\binom {n}{2k}} \left(\ X^{2}-1\ \right)^{k}\ X^{n-2k}}$ This explicit formula can be found [here](https://en.wikipedia.org/wiki/Chebyshev_polynomials#Explicit_expressions). There is a proof using complex numbers but it only works if the ring R = ℂ. The proof here is by induction and works in a commutative ring R. Mathlib seems to extend the definition of Chebyshev polynomials for $n \in \mathbb{Z}$ but this would make the formula more cumbersome with `n.natAbs` in place of `n`'s, so I expressed it on `n : ℕ` directly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	51/1	Mathlib/RingTheory/Polynomial/Chebyshev.lean	1	8	['YuvalFilmus', 'erdOne', 'github-actions', 'metakunt', 'michelsol']	chrisflav assignee:chrisflav	1	100-12326 3 months ago	100-12326 100 days ago	35-16105 35 days
31141	peabrainiac author:peabrainiac	feat(Analysis/Calculus): parametric integrals over smooth functions are smooth	Show that for any smooth function `f : H × ℝ → E`, the parametric integral `fun x ↦ ∫ t in a..b, f (x, t) ∂μ` is smooth too. The argument proceeds inductively, using the fact that derivatives of parametric integrals can themselves be computed as parametric integrals. The necessary lemmas on derivatives of parametric integrals already existed, but took some work to apply due to their generality; we state some convenient special cases. --- - [x] depends on: #31077 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author maintainer-merge	470/12	Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/Separation/Regular.lean	5	36	['fpvandoorn', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac', 'sgouezel']	j-loreaux assignee:j-loreaux	1	96-62631 3 months ago	96-62631 96 days ago	33-85043 33 days
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	16	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll', 'urkud']	nobody	2	92-52279 3 months ago	741-51479 741 days ago	46-5571 46 days
35134	fpvandoorn author:fpvandoorn	feat(translate): print constant names with hover info	Part of #34846. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict	46/28	Mathlib/Tactic/Translate/Core.lean,MathlibTest/toAdditive.lean	2	6	['JovanGerb', 'github-actions', 'mathlib-merge-conflicts']	JovanGerb assignee:JovanGerb	1	92-44199 3 months ago	94-36655 94 days ago	2-13760 2 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	Under the current definition, `IsLocalHom f` and `IsLocalHom f.toMonoidHom` are not defeq, which causes quite some annoyances. We also have a consensus to not use `*HomClass` in definitions. As a result, we change `IsLocalHom` to take an unbundled function instead of a funlike. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated merge-conflict label:t-algebra$	18/9	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean	5	15	['adomani', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp']	mattrobball assignee:mattrobball	1	90-18710 3 months ago	181-70879 181 days ago	24-84527 24 days
31892	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/PolePolar): poles and polars	Define poles and polars for spheres in Euclidean affine spaces, and set up some basic API, including in particular La Hire's theorem (`p₁` lies on the polar of `p₂` if and only if `p₂` lies on the polar of `p₁`). Poles and polars are actually meaningful for any quadric in a projective space over any field, but I think it's reasonable to set up this theory for spheres in the Euclidean context and potentially link it in future to more general projective geometry. --- - [ ] depends on: #31891 - [ ] depends on: #32296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	424/7	Mathlib.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean	4	4	['Parcly-Taxel', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1	89-56271 3 months ago	52-37611 52 days ago	52-38364 52 days
35524	grunweg author:grunweg	feat: text-based linter against \t followed by tactic mode	Wait for the zulip discussion to converge. If there is consensus in favour of this change, summarise the motivation here. [zulip discuss](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/proposal.3A.20no.20more.20use.20of.20.60.E2.96.B8.60.20in.20Mathlib.3F/with/574680826) --- There are currently 80 remaining exceptions in mathlib: ideally, these would get fixed before merging this. Works best when combined with #35523. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-zulip merge-conflict	23/2	Mathlib/Tactic/Linter/TextBased.lean	1	5	['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	87-45668 2 months ago	88-68440 88 days ago	0-3308 55 minutes
35619	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Clique): intersection and union of cliques	Plus a couple of lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	29/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Data/Set/Pairwise/Basic.lean	1	13	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	1	86-15021 2 months ago	25-41423 25 days ago	47-17441 47 days
31766	SuccessMoses author:SuccessMoses	feat(Topology/EMetricSpace): continuity of arc length	fixes half of #31751 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author merge-conflict	396/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	3	40	['SnirBroshi', 'SuccessMoses', 'alreadydone', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	1	84-24680 2 months ago	160-25550 160 days ago	2-77113 2 days
35494	Timeroot author:Timeroot	feat(Topology/Perfect): simp frontier_singleton	Add simp lemma ``` theorem frontier_singleton {X : Type*} [TopologicalSpace X] [T1Space X] [PerfectSpace X] (p : X) : frontier {p} = {p} ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	4/0	Mathlib/Topology/Perfect.lean	1	4	['Timeroot', 'github-actions', 'urkud', 'vihdzp']	urkud assignee:urkud	1	83-47857 2 months ago	84-6993 84 days ago	5-41003 5 days
34805	DavidLedvinka author:DavidLedvinka	feat(Tactic): generalize ofScientific NormNum extension to `DivisionSemiring`	Co-authored-by: @hrmacbeth	t-meta merge-conflict awaiting-author	68/20	Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/OfScientific.lean,MathlibTest/norm_num.lean	3	26	['DavidLedvinka', 'JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'thorimur']	dwrensha assignee:dwrensha	1	83-20640 2 months ago	58-30617 58 days ago	78-71499 78 days
30872	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA closure under concatenation	This PR proves that regular languages are closed under concatenation via a direct construction on `NFA`s without `εNFA` nor ε-transitions. The main new definitions and results include: - `M1.concat M2`, the concatenation of `NFA`s `M1` and `M2`, a direct construction without ε-transitions. - Theorem `accepts_concat : (M1.concat M2).accepts = M1.accepts * M2.accepts`, showing the correctness of the construction. - Theorem `IsRegular.mul`, showing that regular languages are closed under concatenation. --- - [x] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	104/7	Mathlib/Computability/NFA.lean	1	67	['YaelDillies', 'ctchou', 'eric-wieser', 'github-actions', 'lambda-fairy', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'rudynicolop']	nobody	2	81-49276 2 months ago	109-32685 109 days ago	59-63565 59 days
34932	erdOne author:erdOne	feat(AlgebraicGeometry): formally etale morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict delegated	163/12	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyEtale.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/RingHom/Etale.lean	5	17	['chrisflav', 'erdOne', 'github-actions', 'joneugster', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash']	nobody	1	81-12146 2 months ago	83-20635 83 days ago	11-40391 11 days
35423	Rob23oba author:Rob23oba	feat: add congruence lemmas for `Function.update` and `Pi.single`	Adds `simp` congruence lemmas to `Function.update` and `Pi.single` that are specialized for the non-dependent case. See also [#mathlib4 > Simp fails to apply with `Function.update`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Simp.20fails.20to.20apply.20with.20.60Function.2Eupdate.60/with/573889929). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	29/6	Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/RepresentationTheory/Tannaka.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	5	11	['Rob23oba', 'eric-wieser', 'github-actions', 'joelriou', 'joneugster', 'loefflerd', 'mathlib-merge-conflicts']	joelriou assignee:joelriou	1	80-19423 2 months ago	54-80502 54 days ago	36-20932 36 days
34875	banrovegrie author:banrovegrie	feat(LinearAlgebra/Matrix): add Sherman-Morrison formula	Mathlib has the matrix determinant lemma (`det_add_replicateCol_mul_replicateRow` in SchurComplement.lean) but lacked the corresponding inverse formula. This PR fills that gap. - Add `Matrix.inv_add_vecMulVec`: Sherman-Morrison formula for `(A + uv^T)^{-1}` - Add `Matrix.inv_sub_vecMulVec`: subtraction variant - Add `Matrix.isUnit_det_add_vecMulVec`: invertibility under the formula's hypotheses ## Test plan - [x] `lake build` passes - [x] Lines within 100 char limit - [x] All declarations have docstrings Any specific AI usage?: Used Copilot for review purposes.	t-algebra new-contributor awaiting-author label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	14	['Xxxjdjdid', 'banrovegrie', 'chrisflav', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	chrisflav assignee:chrisflav	1	78-44551 2 months ago	33-41640 33 days ago	69-6728 69 days
28685	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the minimal-degree version of the Erdős-Stone theorem	Proves the minimal degree-version of the Erdős-Stone theorem: If `G` has a minimal degree of at least `(1 - 1 / r + o(1)) * card V`, then `G` contains a copy of a `completeEquipartiteGraph` in `r + 1` parts each of size `t`. The double-counting construction from the proof is available in `namespace ErdosStone`. --- - [x] depends on: #25843 - [x] depends on: #27597 - [x] depends on: #27599 - [x] depends on: #28443 - [x] depends on: #28445 - [x] depends on: #28446 - [x] depends on: #28447 This is the first of several pull requests towards the full Erdős-Stone(-Simonovits) theorem, hence the name of the file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	323/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	2	19	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'robin-carlier']	b-mehta assignee:b-mehta	1	77-79545 2 months ago	15-13807 15 days ago	75-22542 75 days
34015	erdOne author:erdOne	feat(AlgebraicGeometry): category of schemes affine over a base	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry delegated awaiting-author	466/11	Mathlib.lean,Mathlib/AlgebraicGeometry/AffineOver.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/SmallAffineZariski.lean,Mathlib/CategoryTheory/Sites/Hypercover/Subcanonical.lean	7	52	['chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	1	76-46620 2 months ago	8-72163 8 days ago	40-35668 40 days
30431	kckennylau author:kckennylau	feat(RingTheory): a homogeneous submodule is the span of its homogeneous elements	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	22/0	Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean	2	9	['alreadydone', 'github-actions', 'kckennylau', 'mariainesdff', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	1	74-32999 2 months ago	196-51761 196 days ago	23-21820 23 days
32989	kim-em author:kim-em	fix(Tactic/Simps): skip @[defeq] inference for non-exposed definitions	This PR makes `@[simps]` check whether the source definition's body is exposed before calling `inferDefEqAttr`. When the body is not exposed, we skip the `@[defeq]` inference to avoid validation errors. Without this fix, using `@[simps]` on a definition that is not `@[expose]`d produces an error like: ``` Theorem Foo_bar has a `rfl`-proof and was thus inferred to be `@[defeq]`, but validating that attribute failed: Not a definitional equality: the left-hand side ... is not definitionally equal to the right-hand side ... Note: This theorem is exported from the current module. This requires that all definitions that need to be unfolded to prove this theorem must be exposed. ``` The fix checks `(← getEnv).setExporting true \|>.find? cfg.srcDeclName \|>.any (·.hasValue)` to determine if the definition body is visible in the public scope, and only calls `inferDefEqAttr` if it is. 🤖 Prepared with Claude Code	t-meta awaiting-author LLM-generated please-adopt merge-conflict	51/3	Mathlib/CategoryTheory/Triangulated/TStructure/TruncLTGE.lean,Mathlib/Tactic/Simps/Basic.lean,MathlibTest/SimpsModule.lean	4	17	['JovanGerb', 'Vierkantor', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts']	nobody	1	73-67808 2 months ago	95-80876 95 days ago	37-18737 37 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	26	['PatrickMassot', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	1	73-59391 2 months ago	333-59130 333 days ago	91-68302 91 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	8/0	lakefile.lean	1	22	['YaelDillies', 'adomani', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1	73-59374 2 months ago	545-13609 545 days ago	0-214 3 minutes
33592	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	This PR picks up https://github.com/leanprover-community/mathlib4/pull/15895 and resolves the failing lemma by redefining Good symbols. --- I checked that https://github.com/leanprover-community/mathlib4/pull/13514 builds correctly when based on this build. PR for that is #33599 This is my first contribution please let me know of any changes I should outline. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-computability new-contributor	160/0	Mathlib/Computability/ContextFreeGrammar.lean	1	34	['YaelDillies', 'github-actions', 'madvorak', 'nielstron']	nobody	1	73-48390 2 months ago	122-76917 122 days ago	10-68503 10 days
35215	kim-em author:kim-em	chore: use @[to_dual] in FixedPoints	This PR adds `@[to_dual]` annotations to 14 theorems about `lfp` in `Order/FixedPoints.lean`, auto-generating their `gfp` duals and deleting the hand-written versions. Also registers `OrderHom.lfp` as the dual of `OrderHom.gfp` via `attribute [to_dual existing]`. Auto-generated duals include: `le_gfp`, `gfp_le_fixed`, `gfp_le`, `gfp_le_map`, `map_gfp`, `isFixedPt_gfp`, `map_le_gfp`, `isGreatest_gfp_le`, `isGreatest_gfp`, `gfp_induction`, `map_gfp_comp`, `gfp_gfp`, `map_inf_fixedPoints_le`, `map_sInf_subset_fixedPoints_le`. [Diff relative to #35208](https://github.com/kim-em/mathlib4/compare/kim/to-dual-bounds-basic...kim/to-dual-fixed-points) - [x] depends on: #35208 🤖 Prepared with Claude Code	LLM-generated merge-conflict	249/548	Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Order.lean	8	11	['JovanGerb', 'github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	alexjbest assignee:alexjbest	1	72-13666 2 months ago	59-43067 59 days ago	24-14816 24 days
36165	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.strongRec(On)'`	In favour of Batteries's `Nat.strongRec` for definitions and `Nat.strong_induction_on` for proofs.	t-data merge-conflict	34/66	Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	8	6	['JovanGerb', 'MichaelStollBayreuth', 'Parcly-Taxel', 'Vierkantor', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	1	71-57997 2 months ago	59-43057 59 days ago	15-53464 15 days
31135	kckennylau author:kckennylau	feat(RingTheory): is localization iff is localization on saturation	In this PR we show that `A` is a localization of `R` on the submonoid `S` iff it is so on the saturation of `S`. Crucially, the saturation of `S` is precisely the elements that become a unit in `A`. --- - [x] depends on: #31132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory delegated	53/0	Mathlib.lean,Mathlib/RingTheory/Localization/Saturation.lean	2	15	['alreadydone', 'chrisflav', 'github-actions', 'kckennylau', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	1	69-13671 2 months ago	41-67206 41 days ago	32-67213 32 days
33355	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph/Connectivity): define vertex connectivity	This PR introduces the foundations of vertex connectivity for simple graphs, providing a counterpart to the edge connectivity theory in #32870. ### Main definitions - `SimpleGraph.IsVertexReachable`: vertices remain reachable after removing strictly fewer than `k` other vertices. - `SimpleGraph.IsVertexConnected`: a graph is `k`-vertex-connected if its order is strictly greater than `k` and any two distinct vertices are `k`-vertex-reachable. Includes basic characterizations for $k=0$ and $k=1$, along with monotonicity lemmas (`anti` and `mono`).	new-contributor t-combinatorics awaiting-author	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	147	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	67-69337 2 months ago	15-61698 15 days ago	51-31094 51 days
35295	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): `dropLast` of a cycle is a path	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	13/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	14	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	YaelDillies assignee:YaelDillies	1	66-50232 2 months ago	39-75713 39 days ago	34-53762 34 days
33506	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): construct a cycle of two distinct paths with same start and end	Co-authored-by: Vlad Tsyrklevich Co-authored-by: Snir Broshi <26556598+SnirBroshi@users.noreply.github.com> --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	109/1	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	4	60	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	2	65-59018 2 months ago	11-5272 11 days ago	28-65685 28 days
27534	PierreQuinton author:PierreQuinton	feat: a typeclass for `sSup`/`sInf` to be lawful	Adds lawful infima and suprema type classes. A preorder with lawful suprema: whenever a set has a least upper bound, `sSup` returns a least upper bound for that set. A preorder with lawful infima: whenever a set has a greatest lower bound, `sInf` returns a greastest lower bound for that set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	26	['PierreQuinton', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	1	65-44094 2 months ago	180-75169 180 days ago	114-37921 114 days
36706	kim-em author:kim-em	feat(Tactic/FastInstance): warn when a synthesized sub-instance has leaky binder types	This PR adds a warning to `fast_instance%` and `inferInstanceAs%` when they encounter a synthesized sub-instance that has leaky data-field binder types. When `fast_instance%` recursively normalizes a class instance, it uses `trySynthInstance` to find canonical sub-instances. If a found sub-instance is not canonical at instances transparency (i.e., its internal lambda binder types reference an unexpanded type alias instead of the target carrier), the tool now emits a warning: ``` fast_instance%: 'leakySub' (for SubClass MyNat) has leaky data-field binder types, which may cause `isDefEq` failures at instances transparency (e.g. in `grind`). Consider redefining it with `fast_instance%` or `inferInstanceAs%`. To suppress: `set_option Elab.fast_instance.warnLeakySubInstances false` ``` The leakiness check uses `withDisabledInstance` to temporarily evict the sub-instance from the discrimination tree (preventing trivial self-match via `trySynthInstance`), then compares against the canonical form at instances transparency. A `warnLeaky` parameter propagates through recursive calls to prevent nested warnings. The warning is suppressed via `set_option Elab.fast_instance.warnLeakySubInstances false`. - [ ] depends on: #36701 🤖 Prepared with Claude Code	t-meta blocked-by-other-PR large-import LLM-generated merge-conflict	415/21	Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/Init.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean,MathlibTest/InferInstanceAsPercent.lean	11	7	['Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	1	52-28702 1 month ago	64-6407 64 days ago	0-1003 16 minutes
37697	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Clique): add theorems about cliques and induced graphs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	22/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	9	['Rida-Hamadani', 'SnirBroshi', 'github-actions']	nobody	1	39-26486 1 month ago	42-50931 42 days ago	42-50924 42 days
37111	tannerduve author:tannerduve	feat(Computability): add Nat.PrimrecIn and PrimrecIn	- Add `Nat.PrimrecIn`: primitive recursive functions relative to a set of oracles - Add `PrimrecIn`: lifts `Nat.PrimrecIn` to `Primcodable` types A `PrimrecIn` version of `RecursiveIn.iff_nat` (i.e., `PrimrecIn O (f : ℕ → ℕ) ↔ Nat.PrimrecIn O f`) is left as future work as it requires proving `Nat.PrimrecIn O Nat.pred`, which needs additional API for `Nat.PrimrecIn`. --- Split out from #34937 as requested in review. - [x] depends on: #37061	t-computability new-contributor awaiting-author	24/0	Mathlib/Computability/RecursiveIn.lean	1	14	['Komyyy', 'bryangingechen', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tannerduve']	nobody	1	38-29298 1 month ago	39-42157 39 days ago	1-79421 1 day
37247	yuma-mizuno author:yuma-mizuno	feat(GroupTheory/MonoidLocalization): add prime transport lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	75/7	Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	3	6	['github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	32-69351 1 month ago	32-69351 32 days ago	20-41780 20 days
37420	artie2000 author:artie2000	refactor: change definitions to avoid `ConvexCone`	Change the definitions of `PointedCone.positive` and `PointedCone.closure` to avoid mentioning `ConvexCone`. This PR is part of a series deprecating `ConvexCone`: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/with/582738985 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	10/4	Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	3	32-61115 1 month ago	32-61079 32 days ago	47-81635 47 days
36774	euprunin author:euprunin	chore: replace long terminal `rw […]`:s (≥4 lemmas) with bare `simp`:s	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `Finset.lcm_union`: unchanged 🎉 * `Finset.gcd_union`: unchanged 🎉 * `Polynomial.derivative_eval₂_C`: unchanged 🎉 * `Polynomial.expand_pow`: unchanged 🎉 * `Cardinal.mk_real`: unchanged 🎉 * `Real.log_zpow`: unchanged 🎉 * `Matroid.eRank_le_encard_add_eRk_compl`: unchanged 🎉 * `DFinsupp.single_tsub`: unchanged 🎉 * `EReal.inv_neg`: unchanged 🎉 * `Finsupp.toMultiset_map`: unchanged 🎉 * `Finsupp.single_tsub`: unchanged 🎉 * `Multiset.countP_map`: unchanged 🎉 * `Nat.ascFactorial_eq_factorial_mul_choose'`: unchanged 🎉 * `Real.sign_intCast`: unchanged 🎉 * `Real.volume_eball`: unchanged 🎉 * `Real.volume_closedEBall`: unchanged 🎉 * `LFunction_ne_zero_of_not_quadratic_or_ne_one`: 295 ms before, 152 ms after 🎉 * `hasSum_one_div_nat_pow_mul_cos`: unchanged 🎉 * `inv_eq_of_aeval_divX_ne_zero`: unchanged 🎉 * `AlgebraicIndependent.aeval_comp_mvPolynomialOptionEquivPolynomialAdjoin`: unchanged 🎉 * `Ordinal.deriv_mul_eq_opow_omega0_mul`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		22/24	Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Real/Sign.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,Mathlib/NumberTheory/ZetaValues.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	19	2	['artie2000', 'euprunin', 'github-actions']	nobody	1	32-33386 1 month ago	62-41912 62 days ago	62-41905 62 days
32282	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): unoriented angle bisection	Add lemmas giving unoriented angles involving the incenter and excenters of a triangle as expressions involving dividing angles of the triangle by 2, deduced from oriented bisection lemmas. --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #31205 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32259 - [ ] depends on: #32260 - [ ] depends on: #32270 - [ ] depends on: #32273 - [ ] depends on: #32278 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	98/0	Mathlib/Geometry/Euclidean/Angle/Incenter.lean	1	8	['github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'wwylele']	nobody	1	29-13670 29 days ago	52-37622 52 days ago	52-38351 52 days
37939	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Order/Completion): embed a linear order into a dense and complete linear order	The aim of the PR is to prove the following theorem that will be used as an input to [Sion.DMCompletion.exists_isSaddlePointOn](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sion.html#Sion.DMCompletion.exists_isSaddlePointOn) : If `β` is any linear order, then there exists a complete and dense linear order `γ` together with a continuous embedding `ι : β ↪o γ` (for the order topologies on `β` and `γ`). Meanwhile, the PR also records various instances about dense orders and lemmas regarding the Dedekind MacNeille completion and lexicographic orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	206/3	Mathlib.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Order/Completion.lean,Mathlib/Topology/Order/Completion.lean,Mathlib/Topology/Sion.lean	5	52	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	vihdzp assignee:vihdzp	1	26-25791 26 days ago	26-46522 26 days ago	29-46214 29 days
37752	JovanGerb author:JovanGerb	chore(Order/CompleteLattice/Lemmas): use `to_dual`	Use `to_dual` for lemmas about `CompleteLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	27/56	Mathlib/Order/CompleteLattice/Lemmas.lean	1	1	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	1	20-12741 20 days ago	41-50509 41 days ago	41-50502 41 days
37753	JovanGerb author:JovanGerb	chore(Order/Filter/Basic): use `to_dual` for `≤ᶠ`	Use `to_dual` on lemmas about `EventuallyLE`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	19/6	Mathlib/Order/Filter/Basic.lean	1	2	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	1	20-12740 20 days ago	41-50374 41 days ago	41-50367 41 days
37346	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉 * `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉 * `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉 * `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉 * `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge awaiting-zulip	7/45	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	22	['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg']	nobody	1	19-60363 19 days ago	19-60394 19 days ago	30-49603 30 days
37389	martinwintermath author:martinwintermath	chore(LinearAlgebra/SesquilinearForm): generalize `orthogonalBilin` in order to simplify definition of `orthogonal`	- generalize `Submodule.orthogonalBilin` to `CommSemiring` and `AddCommMonoid`, and to general sesquilinear forms with inputs from different modules. This enables subsequent changes. - redefine `BilinForm.orthogonal` in terms of `orthogonalBilin`. - reorder arguments of `Submodule.orthogonalBilin` to match other instances of duality across mathlib. For comparison Before ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_5, u_6} {R : Type u_1} {R₁ : Type u_2} {M : Type u_5} {M₁ : Type u_6} [CommRing R] [CommRing R₁] [AddCommGroup M₁] [Module R₁ M₁] [AddCommGroup M] [Module R M] {I₁ I₂ : R₁ →+* R} (N : Submodule R₁ M₁) (B : M₁ →ₛₗ[I₁] M₁ →ₛₗ[I₂] M) : Submodule R₁ M₁ ``` After ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_3, u_5, u_6, u_7} {R : Type u_1} {R₁ : Type u_2} {R₂ : Type u_3} {M : Type u_5} {M₁ : Type u_6} {M₂ : Type u_7} [CommSemiring R] [CommSemiring R₁] [CommSemiring R₂] [AddCommMonoid M] [Module R M] [AddCommMonoid M₁] [Module R₁ M₁] [AddCommMonoid M₂] [Module R₂ M₂] {I₁ : R₁ →+* R} {I₂ : R₂ →+* R} (B : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M) (N : Submodule R₁ M₁) : Submodule R₂ M₂ ``` A few fixes in other files have been necessary as well. This is an extract from #37381. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	28/21	Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	5	8	['eric-wieser', 'github-actions', 'martinwintermath', 'themathqueen', 'vihdzp']	ocfnash assignee:ocfnash	1	19-57029 19 days ago	19-56937 19 days ago	49-25739 49 days
36740	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `AlgebraicGeometry.Scheme.isBasis_affineOpens`: unchanged 🎉 * `SimpleGraph.Walk.takeUntil_eq_take`: 263 ms before, 180 ms after 🎉 * `SimpleGraph.Walk.dropUntil_eq_drop`: 382 ms before, 261 ms after 🎉 * `Int.image_Ico_emod`: unchanged 🎉 * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	8	['artie2000', 'chenson2018', 'github-actions', 'mathlib-merge-conflicts']	nobody	1	19-25309 19 days ago	19-25310 19 days ago	43-5868 43 days
37603	Parcly-Taxel author:Parcly-Taxel	refactor: review of `SetSemiring`	* Rename `Set.up` and `SetSemiring.down` to `SetSemiring.ofSet` and `SetSemiring.toSet` respectively. Unprotect both and make them equivalences, following `FreeMonoid`. * Derive `CompleteAtomicBooleanAlgebra` for `SetSemiring` immediately. * Add `imageHom_id` and `imageHom_comp`. The three existing lemmas about `imageHom` are coalesced into `imageHom_apply`. Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568.	maintainer-merge merge-conflict	120/165	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean	2	42	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel']	nobody	1	19-16699 19 days ago	19-16700 19 days ago	22-62470 22 days
37342	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): non-primitive corecursion for Seq: more `FriendlyOperation` API	This is a continuation of #35072. This PR adds more API about friendly operations: * `FriendlyOperation.coind`: a coinductive principle for proving that operation is friendly * `FriendlyOperationClass.eq_of_bisim`: a generalisation of `Seq.eq_of_bisim'` for proving two sequences are equal. --- - [x] depends on: #35072 This is a part of the `compute_asymptotics` tactic (#28291). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-meta awaiting-author	161/0	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean	1	5	['github-actions', 'joneugster', 'mathlib-dependent-issues']	joneugster assignee:joneugster	1	17-68827 17 days ago	17-68827 17 days ago	28-74243 28 days
37562	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add several lemmas about when `Walk.bypass` and `Walk.cycleBypass` do nothing	Co-authored-by: Vlad Tsyrklevich --- - [ ] depends on: #37577 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	160/79	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	4	8	['IvanRenison', 'SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vlad902']	nobody	1	15-23586 15 days ago	15-23587 15 days ago	0-1043 17 minutes
38880	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/LpSpace/Complete`	- shortens `ae_tendsto_of_cauchy_eLpNorm'` by rewriting the telescoping partial sums in `hx.hasSum.tendsto_sum_nat` directly and concluding with `add_const`, instead of introducing an intermediate eventual `∃ l` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	4/20	Mathlib/MeasureTheory/Function/LpSpace/Complete.lean	1	2	['Parcly-Taxel', 'github-actions', 'yuanyi-350']	kex-y assignee:kex-y	1	14-12958 14 days ago	15-54157 15 days ago	15-54150 15 days
38170	maddycrim author:maddycrim	feat(Algebra/Module/FinitePresentation): Finitely Presented Module Lemma	From FLT Project Main Definitions: `Module.FinitePresentation.exists_fin_exact` : A finitely presented module M admits an exact sequence F' -> F -> M -> 0 where F' and F are finite free modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	9/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	17	['chrisflav', 'github-actions', 'maddycrim', 'themathqueen', 'vlad902']	nobody	1	13-74115 13 days ago	13-74115 13 days ago	17-43852 17 days
36686	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `List.prod_map_ite`: unchanged 🎉 * `Path.Homotopy.trans_assoc_reparam`: 2938 ms before, 717 ms after 🎉 * `SimplexCategory.δ_comp_δ`: 522 ms before, 316 ms after 🎉 * `Finsupp.ext_iff'`: unchanged 🎉 * `Computation.bind_assoc`: unchanged 🎉 * `Set.piecewise_insert`: unchanged 🎉 * `ZMod.valMinAbs_mem_Ioc`: unchanged 🎉 * `Matrix.det_eq_of_forall_row_eq_smul_add_pred_aux`: 2141 ms before, 2004 ms after 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	11/50	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Piecewise.lean,Mathlib/Data/ZMod/ValMinAbs.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean	8	14	['artie2000', 'chenson2018', 'dagurtomas', 'euprunin', 'github-actions', 'mathlib-merge-conflicts', 'ooovi']	dagurtomas assignee:dagurtomas	2	13-31369 13 days ago	13-31372 13 days ago	49-23305 49 days
37955	artie2000 author:artie2000	feat(Algebra/Polynomial): lemmas about `modByMonic`	* Add various small lemmas about `Polynomial.modByMonic` * Remove unneccesary commutativity assumption on `Polynomial.aeval_eq_zero_of_dvd_aeval_eq_zero` by proving `Polynomial.aeval_dvd` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	20/6	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean	5	4	['github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	1	12-29937 12 days ago	12-29937 12 days ago	24-18920 24 days
38873	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Constructions/BorelSpace/Real`	- rewrites `measurable_const_mul` by splitting off the `c = 0` case and proving the nonzero case via `measurable_of_continuousOn_compl_singleton` - replaces the ad hoc case analysis on `⊥`, `⊤`, and real coefficients with a direct continuity argument for multiplication on `EReal` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	5/19	Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean	1	3	['LorenzoLuccioli', 'github-actions', 'yuanyi-350']	kex-y assignee:kex-y	1	11-83275 11 days ago	12-16185 12 days ago	15-27287 15 days
38702	jcommelin author:jcommelin	chore(Data/Real): encapsulate real numbers	This PR: * hides the definition of the real numbers * preserves defeqs when casting `Nat`, `Int`, `Rat`, into the reals * preserves the defeq `x - y = x + (-y)` for `x y : Real` * removes a bunch of technical debt * adjusts imports in the library, where files relied on getting access to Cauchy sequences transitively via importing the reals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	235/256	Archive/Imo/Imo2013Q5.lean,Counterexamples/SeminormLatticeNotDistrib.lean,Mathlib.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Real/Cauchy.lean,Mathlib/Data/Real/Sign.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Instances/Real/Lemmas.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/UniformSpace/CompareReals.lean,Mathlib/Topology/UniformSpace/Real.lean,MathlibTest/Complex.lean,MathlibTest/Quaternion.lean,MathlibTest/Real.lean,MathlibTest/peel.lean	26	31	['JovanGerb', 'Kha', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'jcommelin', 'leanprover-radar', 'mathlib-bors', 'riccardobrasca', 'sgouezel', 'wkrozowski']	nobody	1	11-57554 11 days ago	19-59904 19 days ago	0-2637 43 minutes
38223	Deicyde author:Deicyde	feat(Geometry/Manifold): add `MfldCat`, the category of `C^n` manifolds	We define `MfldCat 𝕜 n`: the category of `C^n` manifolds over a field `𝕜`, following the pattern of `TopCat` in `Mathlib.Topology.Category.TopCat.Basic`. We also implement `HasForget₂ (MfldCat 𝕜 n) TopCat`—the forgetful functor into the category of topological spaces. For more discussion see the Zulip thread: [#PR reviews > #38223 The Category of C^n Manifolds](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/with/587038032) Also added: `ContMDiffMap.id_apply`, `.coe_id` and `.coe_comp` which are comparable to `ContinuousMap` API. ### Future work - ✅ Define a Monoidal structure via product manifolds, analogous to `Manifold.Topology.Category.TopCat.Monoidal` #38560 - ✅ Define the tangent functor: `M ↦ TM`, `F ↦ F.tangentMap` from `MfldCat (n+1) 𝕜` to `MfldCat n 𝕜` #38270 - Functor `FGModuleCat 𝕜 ⥤ MfldCat 𝕜 n` sending a finite-dimensional `𝕜`-vector space to the manifold modeled on itself. Left as `TODO`. - Define `FGModuleCat 𝕜` as an enriched category over `MfldCat n 𝕜`. Then _smooth functors_ can be realized as endofunctors on the enriched category. This is the main motivation for this construction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor t-category-theory	224/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	3	57	['Deicyde', 'chrisflav', 'dagurtomas', 'github-actions', 'idontgetoutmuch', 'peabrainiac']	kim-em assignee:kim-em	1	10-28422 10 days ago	10-31846 10 days ago	23-81955 23 days
38943	felixpernegger author:felixpernegger	feat(Topology/CWComplex/Classical): discrete spaces are CW complexes	as well as some useful lemmas This is partly based on code by @scholzhannah I think this is notable to include, since it is pretty much the only (easy) "topological" sufficient condition for something being a CW complex there is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	89/3	Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/DiscreteSubset.lean	2	28	['felixpernegger', 'github-actions', 'scholzhannah']	PatrickMassot assignee:PatrickMassot	1	10-12796 10 days ago	12-70050 12 days ago	13-84080 13 days
38328	astrainfinita author:astrainfinita	feat: `OrderSupSet`	This PR introduces `OrderSupSet` and `OrderInfSet`, which are typeclasses expressing that `sSup` (resp., `sInf`) returns the least upper bound (resp., the greatest lower bound) of a set whenever one exists. This allows us to prove properties about the `sSup` of specific sets (such as `∅`, singletons, finite sets, and `univ`) without any typeclasses asserting the existence of LUBs. For example, `sSup ∅ = ⊥` holds for any type equipped with `OrderBot` `OrderSupSet`, no longer requiring typeclasses like `ConditionallyCompleteLinearOrderBot`. For a general set `s`, this gives a uniform way to extend results about `IsLUB s a → motive a` to `motive (sSup s)`, `motive (⨆ i, f i)`, `motive (a ⊔ b)`, etc., which allows proof reuse for basic API such as [`csSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/ConditionallyCompleteLattice/Basic.html#csSup_insert), [`iSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#iSup_insert), and [`sSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#sSup_insert) and downstream code like [`csSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#csSup_add), [`sSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#sSup_add), and [`sup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Lattice.html#sup_add). Furthermore, this allows us to refactor incrementally, reducing the dependency of results about various completeness typeclasses on the specific implementation of `sSup`. --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	156/73	Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/SetNotation.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	7	16	['JovanGerb', 'astrainfinita', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'openendings', 'vihdzp']	nobody	1	9-77346 9 days ago	9-77385 9 days ago	15-21686 15 days
37464	martinwintermath author:martinwintermath	feat(Geometry/Convex/Cone): Minor additions to pointed cones	Minor additions to pointed cones: * `PointedCone.ofSubmodule_le_ofSubmodule` and `PointedCone.ofSubmodule_lt_ofSubmodule`. These are not made simp lemmas, instead the underlying `Submodule.restrictScalars_le` and `Submodule.restrictScalars_lt` have been changed into simp lemmas. * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` Co-authored by: Artie Khovanov --- In preparation of #36605. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	22/16	Mathlib/Algebra/Module/Submodule/RestrictScalars.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	24	['YaelDillies', 'artie2000', 'github-actions', 'justus-springer', 'martinwintermath', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	4	7-49899 7 days ago	9-76711 9 days ago	47-3329 47 days
37053	artie2000 author:artie2000	refactor(Analysis/Convex/Cone): use `PointedCone` in Riesz extension theorem	Change the statement of the Riesz extension theorem to take a `PointedCone` rather than a `ConvexCone`. This PR is part of a series replacing `ConvexCone` with `PointedCone`. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/near/581184307 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge merge-conflict	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	9	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash']	nobody	1	7-24912 7 days ago	7-24913 7 days ago	46-71615 46 days
36605	martinwintermath author:martinwintermath	feat(Geometry/Convex/Cone): Add lemmas about interaction of hull, span and negation	Prove lemmas about the interaction of hull, span and negation. Main additions: * `PointedCone.toSubmodule` that produces a submodule with the same support given that `-C = C`. Also the corresponding `CanLift` * `PointedCone.hull_neg_pair_eq_span_singleton` proving `hull R {-x, x} = R ∙ x` (simp lemma) * `PointedCone.span_eq_hull_neg_sup_hull` proving `span R s = hull R (-s) ⊔ hull R s` * `PointedCone.mem_span` proving `x ∈ span R C ↔ ∃ p, n ∈ C, x = p - n` Considerations: there are several ways to express that a convex cone is a submodule: * `-C = C` * `-C ≤ C` or `C ≤ -C` * `C = span R C` * `C = C.lineal` The consensus was that the the first option is the most direct way to express this property, which then allows to lift to a submodule. Co-authored by: Olivia Röhrig, Kilian Rueß, Artie Khovanov --- - [ ] depends on: #37464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-convex-geometry	90/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	53	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1	7-24833 7 days ago	48-20955 48 days ago	17-402 17 days
38483	jessealama author:jessealama	feat(Algebra/BigOperators): add `Antiperiodic.sum_Ico_shift`	Three lemmas about `Finset` sums of `Function.Antiperiodic` functions: `sum_map_add_right` says that for `f` antiperiodic with antiperiod `c`, summing `f` over a `Finset` shifted by `c` (via `addRightEmbedding c`) negates the sum over the original; `sum_Ico_shift` is the half-open-interval specialization, immediate via `Finset.map_add_right_Ico`; and `sum_Ico_mul_add_sum_Ico_mul_shift_eq_zero` is a bilinear cancellation variant. Spun off from #29713 (Euler-Poincaré formula), where the bilinear form is used.	t-algebra label:t-algebra$	63/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Periodic.lean	2	5	['github-actions', 'j-loreaux', 'jessealama', 'wwylele']	ocfnash assignee:ocfnash	1	7-12793 7 days ago	13-79670 13 days ago	23-52694 23 days
36376	jessealama author:jessealama	feat(SimpleGraph): hamiltonian cycle from cyclic permutation	This PR provides `IsHamiltonian.of_perm`, a bridge from `Equiv.Perm.IsCycle` to `SimpleGraph.IsHamiltonian`: if σ is a permutation that is a single cycle with full support on at least 3 elements, and each step `v → σ v` is an edge of `G`, then `G` is Hamiltonian. ### New definitions and lemmas `Mathlib/Data/List/Chain.lean`: - `IsChain.iterate`: `List.iterate f a n` is a chain under `r` whenever `r a (f a)` holds for all `a` `Mathlib/Data/List/Iterate.lean`: - `getLast_iterate`: the last element of `List.iterate f a n` is `f^[n - 1] a` `Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean` (new file): - `Walk.iterate`: builds a walk of length `n` from `x` to `f^[n] x` for any function `f` with `G.Adj x (f x)` for all `x`, defined via `Walk.ofSupport` - `Walk.length_iterate`, `Walk.support_iterate`, `Walk.edges_iterate`: basic API `Mathlib/GroupTheory/Perm/Cycle/Basic.lean`: - `IsCycleOn.injOn_pow_apply`: the map `n ↦ (f ^ n) a` is injective on `Finset.range #s` `Mathlib/GroupTheory/Perm/Cycle/Concrete.lean`: - `IsCycleOn.injOn_sym2_pow_apply`: the unordered-pair edge map `k ↦ s((f ^ k) a, (f ^ (k + 1)) a)` is injective on `[0, #s)` when `#s ≠ 2` - `IsCycleOn.sym2_pow_apply_ne`: edge distinctness for cycle-on permutations — `s((f ^ k) a, (f ^ (k + 1)) a) ≠ s(a, f a)` when `k ≠ 0`, `k < #s`, and `#s ≠ 2` - `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers `Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`: - `cons_isHamiltonianCycle_iff`: a Hamiltonian path closed by an edge outside its support is a Hamiltonian cycle, and conversely - `IsHamiltonian.of_perm`: the main theorem --- - [x] depends on: #36307	t-combinatorics maintainer-merge	182/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian/Perm.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Iterate.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	8	76	['SnirBroshi', 'YaelDillies', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1	6-58528 6 days ago	6-55268 6 days ago	44-17401 44 days
39230	bryangingechen author:bryangingechen	chore: extract API from #38807 and golf	I wanted to understand why these two proofs in #38807 were long (and also play around more with the API in this corner of the library) so I walked through them with Claude Opus. prepared with Claude code	t-order LLM-generated	23/37	Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/DirSupClosed.lean	2	2	['github-actions', 'vihdzp']	nobody	1	6-21967 6 days ago	7-10203 7 days ago	7-10196 7 days
36202	vihdzp author:vihdzp	feat: more theorems on the Cantor normal form	We also remove some redundant assumptions. Used in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	68/17	Mathlib/SetTheory/Ordinal/CantorNormalForm.lean	1	21	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	YaelDillies assignee:YaelDillies	1	5-70289 5 days ago	54-69838 54 days ago	73-61792 73 days
36388	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/AdjMatrix): submatrices and homomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	73/3	Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean	1	19	['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen']	nobody	1	5-62170 5 days ago	6-12348 6 days ago	35-49296 35 days
38114	javgomzar author:javgomzar	feat(FinitelyPresentedGroup): add finite groups instance	Add IsFinitelyPresented instance for finite groups. Co-authored-by: Hang Lu Su , Thomas Browning --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor large-import	31/2	Mathlib/GroupTheory/FinitelyPresentedGroup.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean	2	33	['github-actions', 'javgomzar', 'kbuzzard', 'mathlib-merge-conflicts', 'plp127', 'tb65536', 'vihdzp']	mattrobball assignee:mattrobball	1	5-37397 5 days ago	5-37433 5 days ago	28-35163 28 days
37928	AlexeyMilovanov author:AlexeyMilovanov	refactor(Computability.Encoding): unbundle Γ and remove FinEncoding	This PR unbundles the alphabet `Γ` from the `Encoding` structure and completely removes `FinEncoding`. `Encoding`: The alphabet `Γ` is now an explicit parameter: `structure Encoding (α : Type u) (Γ : Type v)`. `FinEncoding`: Removed. Finiteness is now handled via standard typeclasses (e.g., `[Fintype Γ] (e : Encoding α Γ)`). Combinators: Functions like `finEncodingPair` are simplified to `encodingPair`, dropping the `fin` prefix and `[Fintype]` requirements where no longer needed. Downstream: Mechanically updated `Mathlib.Computability` and `Mathlib.ModelTheory` to pass the explicit `Γ` and use `[Fintype Γ]` where `FinEncoding` was previously required.	new-contributor maintainer-merge	87/67	Mathlib/Computability/Encoding.lean,Mathlib/ModelTheory/Encoding.lean	2	9	['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'vihdzp']	nobody	1	5-17258 5 days ago	11-68236 11 days ago	37-48085 37 days
35820	smmercuri author:smmercuri	feat: unit lemmas and embedding for `FiniteAdeleRing`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	42/4	Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean	1	11	['Multramate', 'Ruben-VandeVelde', 'github-actions', 'smmercuri']	mariainesdff assignee:mariainesdff	1	5-12404 5 days ago	27-70260 27 days ago	73-54773 73 days
39016	vihdzp author:vihdzp	chore: deprecate `WithZero.zero_le`	This is a duplicate of `zero_le` in the root namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra maintainer-merge label:t-algebra$	14/24	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/FieldTheory/RatFunc/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	4	2	['YaelDillies', 'github-actions']	nobody	1	5-7453 5 days ago	11-80410 11 days ago	11-82623 11 days
39218	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): make `p.Nil` the simpNF of `p = nil` and `p.length = 0`	These are equivalent, and `p.Nil` works even when the endpoints of the walk aren't defeq. [#graph theory > Deprecate `p = nil` in favor of `p.Nil`?](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Deprecate.20.60p.20.3D.20nil.60.20in.20favor.20of.20.60p.2ENil.60.3F/with/538017334) The main event is `Walk/Basic.lean`: - Swapped sides of `nil_iff_eq_nil` to create `eq_nil_iff_nil`, tagged `@[simp]` and deprecated the original - Changed the RHS of `length_eq_zero_iff` from `p = nil` to `p.Nil`, and generalized to non-closed walks - Deprecated `nil_iff_length_eq` which is the symmetric iff - Added `Nil.length_eq_zero` alias - Untagged `exists_length_eq_zero_iff` with `@[simp]` and added `exists_nil_iff` to replace it The rest is fixing everything that broke (or uses of now-deprecated lemmas), and: - [`Walk/Maps`] Added `nil_map_iff` to replace `map_eq_nil_iff` which is the same but with `.Nil` instead of `= nil` - [`Walk/Decomp`] Added `nil_rotate` to replace `rotate_eq_nil` which is the same but with `.Nil` instead of `= nil` --- Also renamed `set_walk_*` in `Counting.lean` to follow the naming convention. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	70/54	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Counting.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Traversal.lean	10	10	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	1	5-5918 5 days ago	6-53709 6 days ago	7-5866 7 days
37577	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): upgrade subset theorems to sublist/prefix/suffix	Upgrades theorems about `p.support ⊆ q.support` / `p.darts ⊆ q.darts` / `p.edges ⊆ q.edges` to `List.IsInfix`/`List.IsSuffix`/`List.Sublist`, which imply the subset versions. Also adds `cycleBypass` sublist lemmas that were missing, and golfs `length_bypass_le` and `bypass_eq_self_of_length_le` using the new sublist theorems. Co-authored-by: Iván Renison <85908989+IvanRenison@users.noreply.github.com> --- Except for a couple of `cycleBypass` ones, I did not add such theorems where there was no subset theorem to begin with (e.g. `(p.take n).darts <+: p.darts`), as they are usually not worth stating since they're trivial and simp proves them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	112/81	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	5	4	['YaelDillies', 'github-actions']	nobody	1	5-5900 5 days ago	6-52821 6 days ago	45-85191 45 days
36743	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): introduce `GraphLike` typeclass	Per discussion at ([#graph theory > HasAdj](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445)), This PR introduces the `GraphLike` typeclass to capture the notions like `dart` and `walk` across various graph objects, such as `SimpleGraph`, `Graph`, and `Digraph`. The goal is that by abstracting these core components into a typeclass, we can prove these results once for all graph-like structures rather than duplicating them across different graph types. ### Main definitions * `GraphLike V D E Gr`: A typeclass parameterized by a vertex type `V`, dart type `D` and a graph type `Gr` (with `V`, `D` & `E` as an `outParam`). * `GraphLike.verts : Set V`: The set of vertices of the graph. * `GraphLike.darts : Set D`: The set of darts of the graph. * `GraphLike.edges : Set E`: The set of edges of the graph. * `GraphLike.Adj : V → V → Prop`: The adjacency relation, defined by default as `∃ d ∈ darts, fst d = u ∧ snd d = v`. --- This PR generalises #35776 to also unify `Graph`. PRs depending on this PR are #39047 (graphLike with no multi edges) => #39050 (Digraph is graphLike) \|\| V #36829 (undirected graphLike) => #39053 (Graph is graphLike) & #39054 (Simplegraph is graphLike) \|\| V #36756 (def of walk on GraphLike) => #36971 (change Simplegraph to use GraphLike walk) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	104/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	2	78	['IvanRenison', 'Jun2M', 'SnirBroshi', 'YaelDillies', 'github-actions', 'lauramonk', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	1	5-920 5 days ago	10-44472 10 days ago	61-42881 61 days
34440	grunweg author:grunweg	feat: linter for name components in uppercase	Per the naming convention, these are errors (unless they are an abbreviation). Mathlib has many violations at the moment: for this reason, we add this as an environment linter and automatically add all current exceptions. Once these have been fixed, converting to a syntax linter is desirable. Until then, track the number of such exceptions as technical debt. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20linter/with/570617527) Note to self: wait for CI, then do a final nolints update. and try to implement the follow-up soon [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import awaiting-author merge-conflict please-adopt	1018/9	Mathlib/Tactic/Linter/Style.lean,MathlibTest/DoubleUnderscore.lean,MathlibTest/HashLint.lean,MathlibTest/Lint.lean,MathlibTest/LintStyle.lean,scripts/nolints.json,scripts/technical-debt-metrics.sh	7	27	['Vierkantor', 'github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts']	nobody	1	4-76091 4 days ago	89-71453 89 days ago	13-82065 13 days
37677	vihdzp author:vihdzp	feat: club sets	In set theory, a club set is a subset of an ordinal of uncountable cofinality, which is closed in the order topology, and unbounded within the ordinal. We generalize this notion to that of a club set in a well-order `α`: this is a set which is cofinal and closed under suprema. We recover the more standard notion by setting `α = Iio o`, whenever `ℵ₀ < o.cof`. We prove that club sets are closed under intersections of size less than the cofinality of `α`, and that the fixed points of a normal function are a club set. --- The idea is to eventually rework [`Ordinal.deriv`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/FixedPoint.html#Ordinal.deriv). This is simply the enumerator function for the fixed points of `f`, and enumerator functions for club sets are always normal. - [x] depends on: #37670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order maintainer-merge	181/13	Mathlib.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/FundamentalSequence.lean	8	17	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	2	4-69935 4 days ago	4-72874 4 days ago	26-3465 26 days
39064	kim-em author:kim-em	feat: make showLinter detect tactics that assign metavariables	This PR removes a short-circuit in `showLinter` that suppressed the linter whenever the syntactic goal was unchanged by a `show` tactic. A `show` invocation can still have side-effects on the metavariable context — tactic elaboration may assign metavariables while leaving the goal type unchanged — so the existing `instantiateMVars`-based diff check should run unconditionally. The fast path for the genuine no-op case is preserved: if `before` and `after` types still match after `instantiateMVars`, the linter doesn't fire. This was discovered while adapting Mathlib to nightly-2026-05-03 in https://github.com/leanprover-community/mathlib4-nightly-testing/pull/215 and is being extracted here so it can land independently of that bump. 🤖 Prepared with Claude Code	t-linter delegated	1/1	Mathlib/Tactic/Linter/Style.lean	1	3	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	thorimur assignee:thorimur	1	4-55724 4 days ago	4-55725 4 days ago	6-25575 6 days
35216	kim-em author:kim-em	doc(Tactic/Translate/ToDual): add deployment guide for @[to_dual]	This PR expands the documentation for `@[to_dual]` with practical advice for deploying it to existing code. Module docstring (`Mathlib/Tactic/Translate/ToDual.lean`): adds a "Deploying `@[to_dual]` to existing code" section covering name agreement, attribute propagation, docstring syntax ordering, declaration order dependencies, and known structural mismatches (conjunct reordering, type class gaps, interval argument swapping). Attribute docstring: adds a note that `@[simp]` is not auto-copied (must use `(attr := simp)`), and shows the correct ordering when combining `(attr := ...)` with docstrings. 🤖 Prepared with Claude Code --- @joneugster: this is no longer part of the PR, so I removed it from the description: > Agent skill (`.claude/skills/to_dual/SKILL.md`): detailed step-by-step instructions for an AI agent deploying `@[to_dual]`, including how to identify candidates, common patterns, and debugging.	documentation LLM-generated maintainer-merge	31/3	Mathlib/Tactic/Translate/ToDual.lean	1	31	['JovanGerb', 'MichaelStollBayreuth', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts', 'vihdzp']	joneugster assignee:joneugster	1	4-54376 4 days ago	31-20012 31 days ago	38-6691 38 days
36155	grunweg author:grunweg	feat: custom elaborators for TangentSpace and tangentMap(Within)	And use these to golf the differential geometry files a bit further. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta awaiting-author	85/30	Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Topology/FiberBundle/Constructions.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean	8	7	['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash']	JovanGerb assignee:JovanGerb	1	4-50439 4 days ago	4-50439 4 days ago	69-16913 69 days
38983	kebekus author:kebekus	feat: Invariance of `meromorphic in normal form` under composition.	Establish invariance of `meromorphic in normal form` under composition with analytic functions of non-vanishing derivative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	42/0	Mathlib/Analysis/Meromorphic/NormalForm.lean	1	12	['github-actions', 'kebekus', 'themathqueen']	themathqueen assignee:themathqueen	1	4-48201 4 days ago	4-48201 4 days ago	11-69193 11 days
37722	SabrinaJewson author:SabrinaJewson	feat(Order/Cover): intervals equal singletons iff	To complement `Set.Icc_eq_singleton_iff`, this introduces: - `Set.Ioc_eq_singleton_iff` / `Set.Ico_eq_singleton_iff` - `Set.Ico_eq_singleton_left_iff` / `Set.Ioc_eq_singleton_right_iff` - `Set.Ioi_eq_singleton_iff` / `Set.Iio_eq_singleton_iff` - `Set.Ioi_eq_singleton_top_iff` / `Set.Iio_eq_singleton_bot_iff` - `Set.Ioo_eq_singleton_iff` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor awaiting-author maintainer-merge	39/0	Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean	2	16	['Komyyy', 'SabrinaJewson', 'github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	1	4-36749 4 days ago	6-76106 6 days ago	35-12445 35 days
36541	BGuillemet author:BGuillemet	feat(CategoryTheory): define internal equivalence relations	Define internal equivalence relations in any category `C`, as a structure on parallel pairs of morphisms. Prove that equivalence relations on types are equivalence relations in the category of types. Prove that kernel pairs are equivalence relations. Define (universally) effective equivalence relations, and a associated class for categories in which every equivalence relation is effective universal. Prove that an effective equivalence relation yields a coequalizer diagram, and that the associated projection on the "quotient" of the relation is a regular epimorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	320/0	Mathlib.lean,Mathlib/CategoryTheory/EquivalenceRelation.lean,Mathlib/CategoryTheory/Limits/Shapes/RegularMono.lean	3	26	['BGuillemet', 'chrisflav', 'dagurtomas', 'github-actions', 'robin-carlier']	b-mehta assignee:b-mehta	1	4-26445 4 days ago	4-57611 4 days ago	25-70268 25 days
37248	harahu author:harahu	doc(Tactic): avoid lazy continuation lines	We resolve the ambiguity inherent in lazy (un-indented) list item continuation lines by either indenting them or separating them by inserting a newline in the cases where the item continuation was a mistake. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	123/114	Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/DepRewrite.lean,Mathlib/Tactic/Finiteness.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean	15	4	['Multramate', 'github-actions', 'grunweg', 'harahu', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	1	4-8445 4 days ago	4-35938 4 days ago	52-43236 52 days
37623	IvanRenison author:IvanRenison	feat(Order/RelIso): add theorems about `RelHom.comp` and `RelEmbedding.trans`	Co-authored-by: SnirBroshi <26556598+SnirBroshi@users.noreply.github.com> --- Missing of this theorems noticed by @SnirBroshi in #37598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	18/0	Mathlib/Order/RelIso/Basic.lean	1	8	['IvanRenison', 'SnirBroshi', 'dagurtomas', 'eric-wieser', 'github-actions']	nobody	1	3-69570 3 days ago	43-43040 43 days ago	44-66568 44 days
39296	scholzhannah author:scholzhannah	feat: more informative output messages in the flexible linter	The current output messages in the flexible linter are: - If the stained location is a hypothesis: `'exact h' uses 'h'!` - If the stained location is the goal: `'exact Nat.le_succ_of_le h' uses '⊢'!` I think the first is not very informative and the second is additionally confusing. So I change them to read: - For a hypothesis: `'exact h' uses 'h', which was modified by a flexible tactic!` - And for the goal: `'exact Nat.le_succ_of_le h' modifies the current goal, which was modified by a flexible tactic!` I also added some more explanation to the messages in the case that all the hypotheses and the goal were stained by `simp at *`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	128/25	Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/FlexibleLinter.lean,MathlibTest/ImportHeavyFlexibleLinter.lean	3	6	['b-mehta', 'github-actions', 'grunweg', 'scholzhannah']	grunweg assignee:grunweg	1	3-66598 3 days ago	3-66598 3 days ago	3-66591 3 days
26975	Whysoserioushah author:Whysoserioushah	feat: a norm_num extension for complex numbers	co-authored-by : @thefundamentaltheor3m, @hrmacbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	424/12	Mathlib.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/NormNumI.lean,Mathlib/Tactic/NormNum/Result.lean,MathlibTest/norm_numI.lean	7	58	['JovanGerb', 'Vierkantor', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	1	3-60593 3 days ago	75-52046 75 days ago	112-23769 112 days
38968	eric-wieser author:eric-wieser	fix: improve defeqs of comp actions	The (deliberately) non-reducible `SMul.comp.smul` definition caused us to end with these failing unification examples at instance reducibility: ```lean example : (Module.compHom ℕ (RingHom.id ℕ)).toSMul = SMul.comp ℕ (RingHom.id ℕ) := by with_reducible_and_instances rfl example : (Module.compHom ℕ (RingHom.id ℕ)).toMulAction = MulAction.compHom ℕ (MonoidHom.id ℕ) := by with_reducible_and_instances rfl ``` There are two issues this fixes: * the `compHom` constructors are inconsistent on whether they use `SMul.comp.smul` or reimplement its contents * we need `SMul.comp.smul` to be instance-reducible, so that when invoked with the identity function it is instance-defeq to the original action. As a bonus, allowing these to unify means we can have a single `SMul.comp_smul_def` lemma that works for all of the `compHom` definitions. We could also consider changing `compHom` to take a `HomClass` in order to remove the casts entirely, which would remove the need to add these `SMul.comp` terms. This PR leaves that for possible future work, noting that in the past we have moved away from writing `def`s taking `HomClass`es. Co-authored-by: Junye Ji --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Refined from #38777	t-algebra delegated label:t-algebra$	35/19	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/Module/RingHom.lean	5	5	['JJYYY-JJY', 'Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	1	3-60038 3 days ago	3-60038 3 days ago	8-53809 8 days
37755	YaelDillies author:YaelDillies	refactor(Data/Finsupp): use `single` in `uniqueEquiv`	In essence, this changes `(Finsupp.uniqueEquiv i).symm m` from having support `univ.filter (fun _ ↦ m ≠ 0)` to having support `if m = 0 then {i} else ∅`. These are equal, but having the RHS be `single 1 r` is much more useful in practice. Similarly for `MonoidAlgebra`. To avoid simp getting stuck after rewriting with `uniqueEquiv_symm_apply`, add `uniqueEquiv_symm_apply_apply` and tag it with `simp↓ high`. Also rename `Equiv.finsuppUnique` to `Finsupp.uniqueEquiv` and change the `Unique ι` argument into `Subsingleton ι` and `i : ι`. Similarly for `AddEquiv` and `LinearEquiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	110/70	Mathlib/Algebra/FreeAlgebra/Cardinality.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/TensorProduct/Free.lean	18	18	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions']	Vierkantor assignee:Vierkantor	1	3-55349 3 days ago	3-55422 3 days ago	12-18041 12 days
38362	vihdzp author:vihdzp	feat: cofinal subset of regular cardinal is isomorphic to it	In set theory, one often identifies a cardinal `c` with its initial ordinal `c.ord`, and said ordinal with the lower set `Iio c.ord`. This is particularly pervasive in the theory of club and stationary subsets, where one often sees the hypothesis "let κ be a regular cardinal" in lieu of the more precise wording: that `κ` is an (infinite) well-order, whose order type equals the initial ordinal of its cardinality. We define a typeclass `IsRegularCardinalOrder` for this assumption. The benefit of using it is that our results won't apply only to `Iio c.ord` for regular `c`, but also to concrete types such as `Nat`, `Cardinal`, or `Ordinal`. As a proof of concept, we define `Order.enum`, a generalization of both `Nat.nth` and `Ordinal.enumOrd`. A future PR will deprecate the latter. --- - [x] depends on: #38363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	127/11	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean	5	12	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	3-49968 3 days ago	3-69469 3 days ago	7-28007 7 days
38097	NoahW314 author:NoahW314	feat: add `IndiscreteTopology` instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Separation/Connected.lean	4	5	['NoahW314', 'github-actions', 'scholzhannah', 'vihdzp']	urkud assignee:urkud	1	3-12837 3 days ago	32-56546 32 days ago	32-75578 32 days
38731	martinwintermath author:martinwintermath	feat(LinearAlgebra/AffineSpace/AffineSubspace): using `AffineSubspace.direction` to reinterpret `AffineSubspace` as `Submodule`	* add `AffineSubspace.vsub_self_of_zero_mem` that states `s -ᵥ s = s ` if `0 ∈ s` * add `AffineSubspace.direction_eq_self_of_zero_mem` that states that if `0 ∈ s`, then the directions coerce back to the affine subspace. * add corresponding `CanLift` instance. * modify doc-string of `AffineSubspace.direction` to state that this can be used for reinterpretation of an affine subspace as a submodule. * add `Coe` instance based on `Submodule.toAffineSubspace` and adds corresponding @[coe] attribute. The PR also performs a slight cleanup of the file: statements about `SetLike` or `Submodule.toAffineSubspace` have been moved closer to their respective definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	56/26	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	1	3	['github-actions', 'wwylele']	themathqueen assignee:themathqueen	1	3-12836 3 days ago	19-37587 19 days ago	19-38731 19 days
39332	Michaillus author:Michaillus	chore(Topology/Spectral): Added two small lemmas	chore(Topology/Spectral): Added two lemmas `IsCompact.isClosed_constructibleTopology_of_isOpen` `IsCompact.isClosed_constructibleTopology_of_isClosed` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	12/0	Mathlib/Topology/Spectral/ConstructibleTopology.lean	1	6	['Michaillus', 'github-actions', 'qawbecrdtey']	PatrickMassot assignee:PatrickMassot	1	3-12830 3 days ago	5-26193 5 days ago	5-26186 5 days
39438	SnirBroshi author:SnirBroshi	chore(Order/WellFounded): use `to_dual`	Creates `argmax`/`argmaxOn` duals to the existing `argmin`/`argminOn`, and `WellFoundedLT.min`/`WellFoundedGT.max` in order to properly dualize `WellFounded.min_le`. Some theorems about `WellFounded{LT/GT}` which didn't have a dual before have to be renamed to make room, e.g. `StrictMono.range_inj` is renamed to `StrictMono.range_inj_of_wellFoundedLT`. --- This is blocking dualizing things in `ConditionallyCompleteLattice/Basic.lean`. `WellFounded.min_le` has ~30 usages in ~10 files, so deprecating it should probably happen in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	80/34	Mathlib/Data/Finset/Sort.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/WellFounded.lean,Mathlib/SetTheory/Ordinal/Enum.lean	4	5	['SnirBroshi', 'github-actions', 'vihdzp']	nobody	1	3-10745 3 days ago	3-10817 3 days ago	3-19406 3 days
37076	ertwro author:ertwro	feat(Combinatorics/SimpleGraph/Hasse): Hasse diagram is triangle-free	Add `SimpleGraph.hasse_cliqueFree_three`: the Hasse diagram of a preorder is triangle-free (`CliqueFree 3`). This is the graph-theoretic formulation of `not_covBy_of_lt_of_lt`: if `a ⋖ b` and `b ⋖ c`, then `¬ a ⋖ c`, so no three elements can be pairwise adjacent in the Hasse diagram. The proof extracts three vertices from a hypothetical 3-clique, case-splits on the covering directions (8 cases), and closes each by `not_covBy_of_lt_of_lt` (6 transitive cases) or `lt_asymm` (2 cyclic cases). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	11/0	Mathlib/Combinatorics/SimpleGraph/Hasse.lean	1	21	['Rida-Hamadani', 'SnirBroshi', 'ertwro', 'github-actions', 'vlad902']	nobody	1	2-85139 2 days ago	30-2215 30 days ago	38-11988 38 days
37386	gasparattila author:gasparattila	chore: call `dsimp` in the default tactic of `ContinuousLinearMap`	--- This will also reduce the breakage in https://github.com/leanprover-community/mathlib4/pull/35548. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	32/73	Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/Notation.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/ConjSqrt.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Basic.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Independence.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/LinearMapCompletion.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Star/LinearMap.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean	35	21	['gasparattila', 'github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'themathqueen']	j-loreaux assignee:j-loreaux	1	2-55121 2 days ago	2-55156 2 days ago	9-19271 9 days
35683	gasparattila author:gasparattila	fix(Tactic/FunProp): detect `Continuous.subtype_mk` as compositional	This PR changes `fun_prop` to detect some theorems involving dependent types, such as `Continuous.subtype_mk` to be in compositional form. This lets `fun_prop` solve goals such as `Continuous fun x => (⟨x, trivial⟩ : {x : ℝ // True})`. --- These theorems become compositional: `Continuous.subtype_mk`, `Topology.IsEmbedding.inclusion`, `Topology.IsOpenEmbedding.inclusion`, `Topology.IsClosedEmbedding.inclusion`, `Measurable.subtype_mk`, `Measurable.imp`, `Path.symm_continuous_family`, `Continuous.upperHalfPlaneMk` These theorems become simple: `hasFDerivAt_prodMk_left`, `hasFDerivAt_prodMk_right`, `contDiff_prodMk_left`, `contDiff_prodMk_right` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta maintainer-merge	66/44	Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,MathlibTest/FunPropMinimal.lean	5	27	['gasparattila', 'github-actions', 'grunweg', 'joneugster', 'lecopivo', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	1	2-54725 2 days ago	2-54796 2 days ago	82-60357 82 days
39110	SnirBroshi author:SnirBroshi	chore(Data/Set): reduce defeq abuse of `Set α = α → Prop`	These are among the first places that would fail if `Set α` wasn't defeq to `α → Prop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	35/20	Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Order/BooleanAlgebra/Set.lean	5	24	['SnirBroshi', 'Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'themathqueen', 'urkud', 'vihdzp']	nobody	1	2-53750 2 days ago	2-68701 2 days ago	8-70094 8 days
30526	SnirBroshi author:SnirBroshi	chore(Logic/Relation): use `≤` to spell subrelation	Replace every `∀ x y, r x y → r' x y` with `r ≤ r'` --- NOTE: this PR began as an effort to use `Subrelation` since `≤` wasn't available in this file, but it was agreed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2330526.20use.20Subrelation.20in.20Mathlib.2ELogic.2ERelation/with/546572676) to instead make `≤` available there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	146/133	Mathlib.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Filtered/Connected.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Types/Coequalizers.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/TuringMachine/Config.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/Prop.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/Topology/Gluing.lean	19	22	['SnirBroshi', 'Vierkantor', 'eric-wieser', 'github-actions', 'joneugster', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'thorimur', 'vihdzp']	Vierkantor and joneugster assignee:Vierkantor assignee:joneugster	1	2-46529 2 days ago	2-46673 2 days ago	84-79631 84 days
32583	MJ141592 author:MJ141592	refactor(SimpleGraph): change bridges not to require the edge to be present	Remove the requirement for edges to exist in definition of isBridge, and then change the related lemmas to adjust for this, by renaming, fixing the statements and fixing the proofs, including in Acyclic. Closes #31690. --- - [x] depends on: #36802 - [x] depends on: #36804	t-combinatorics new-contributor	95/93	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean	5	47	['MJ141592', 'Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	2	2-42349 2 days ago	2-43895 2 days ago	45-17731 45 days
35287	arnoudvanderleer author:arnoudvanderleer	feat(AlgebraicTopology/SimplicialSet): define isomorphisms in simplicial sets, and the coherent isomorphism simplicial set	show that any edge in a simplicial set, that is the image of the forward edge of the coherent isomorphism under a simplicial set morphism, is an isomorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor infinity-cosmos awaiting-author	362/3	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/CoherentIso.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveCodiscrete.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean	6	122	['arnoudvanderleer', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'robin-carlier']	robin-carlier assignee:robin-carlier	1	2-40836 2 days ago	2-40836 2 days ago	31-932 31 days
37779	mcdoll author:mcdoll	feat(Data/FunLike): introduce typeclasses for algebraic properties of `FunLike`	These typeclasses remove the need for each function space that has, e.g., a linear structure to define `add_apply`, `smul_apply`, etc. Instead after defining the the `Add` instance one also defines a `FunLikeAdd` instance (with a proof usually being `rfl`). Allows removing some boilerplate as theorems like `sum_apply` are currently proved in various files: after this PR, they can be proved in an abstract way. Moreover, we provide abbreviations for further structure (such as `Semigroup``) in the concrete function spaces. The usage of these typeclasses were prototyped in #33477 and will be merged in a separate PR. The docstrings were generated with AI (and heavily edited afterwards), everything else is handwritten. --- The previous PR #33477 has gotten quite a few merge conflicts, so I opened a new PR with just the new features. I would like to get the approval of this design before going through the library and change everything. I am open to either do this in this PR or a second one (or multiple for different parts). - [x] depends on: #38401 - [x] depends on: #38398 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	678/0	Mathlib.lean,Mathlib/Data/FunLike/Group.lean,Mathlib/Data/FunLike/IsApply.lean,Mathlib/Data/FunLike/Module.lean,Mathlib/Data/FunLike/Ring.lean	5	29	['Vierkantor', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mcdoll']	Vierkantor and j-loreaux assignee:Vierkantor assignee:j-loreaux	1	2-35984 2 days ago	2-36059 2 days ago	20-6513 20 days
39422	eric-wieser author:eric-wieser	feat: add congruence lemmas for (d)finsupp big operators	Also adds the missing n-ary product lemmas to match the existing sum lemmas. Co-authored-by: Antoine Chambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	170/1	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Data/DFinsupp/BigOperators.lean,Mathlib/GroupTheory/Congruence/BigOperators.lean,Mathlib/RingTheory/Congruence/BigOperators.lean,Mathlib/RingTheory/TwoSidedIdeal/BigOperators.lean	5	17	['AntoineChambert-Loir', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	1	2-25510 2 days ago	3-25750 3 days ago	3-37615 3 days
38911	Vierkantor author:Vierkantor	chore(Tactic): deprecate `substs` and replace it with `subst`	The `substs` tactic was a wrapper around `subst` to call it multiple times for different hypotheses. But `subst` now supports multiple hypotheses, so we can deprecate `substs` and replace it with `subst`. I added a deprecation warning using a `Try this:` message. Spotted while checking tactic docstrings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated	46/42	Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/CategoryTheory/Preadditive/Mat.lean,Mathlib/Computability/DFA.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/RingedSpace/Stalks.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Order/Concept.lean,Mathlib/Order/JordanHolder.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic/Substs.lean,Mathlib/Topology/Gluing.lean	22	17	['JovanGerb', 'Vierkantor', 'bryangingechen', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors', 'plp127']	thorimur assignee:thorimur	1	2-17519 2 days ago	9-17872 9 days ago	5-44109 5 days
32828	Hagb author:Hagb	feat(Algebra/Order/Group/Defs): add `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`	It is similar to `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`, while with different hypotheses. The conclusion `IsOrderedCancelMonoid α` on `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid` still holds when the hypothesis `CommGroup α` is weakened to `CancelCommMonoid α` while `PartialOrder α` is strengthened to `LinearOrder α`. --- [`IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=IsOrderedAddMonoid.toIsOrderedCancelAddMonoid#doc) and `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`: https://github.com/leanprover-community/mathlib4/blob/97f78b1a4311fed1844b94f1c069219a48a098e1/Mathlib/Algebra/Order/Group/Defs.lean#L52-L62 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	15	['Garmelon', 'Hagb', 'Vierkantor', 'artie2000', 'dagurtomas', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	2	2-10624 2 days ago	116-47047 116 days ago	40-42357 40 days
38536	CoolRmal author:CoolRmal	feat: a lemma about the symmetric difference of unions	Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy delegated	58/2	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/CompleteBooleanAlgebra.lean	2	17	['CoolRmal', 'SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	1	2-3414 2 days ago	4-37203 4 days ago	7-75625 7 days
39487	ADedecker author:ADedecker	chore: switch `EqLocus` from `LinearMapClass` to `LinearMap`	--- Note: this PR was opened at 35000 feet :slightly_smiling_face: [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	20/17	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	5	8	['ADedecker', 'b-mehta', 'github-actions', 'themathqueen']	nobody	1	1-64672 1 day ago	2-5599 2 days ago	2-7539 2 days
39203	FordUniver author:FordUniver	refactor(Analysis/Calculus/Gradient): ungate inner_gradient lemmas	Removes superfluous differentiability hypotheses (plus `UniqueDiffWithinAt` for the `Within` versions) from the four `inner_gradient[Within]_[left\|right]` lemmas: `gradient` is defined as `(toDual 𝕜 F).symm (fderiv 𝕜 f x)`, so `⟪∇ f x, y⟫ = fderiv 𝕜 f x y` holds unconditionally since both sides are zero when `f` is not differentiable at `x`. --- Genuinely unsure about this one because the only call I currently have in my code itself has the differentiability hypothesis. But including unused (or unnecessary) assumptions seems not intentional? My best guess is that the hypotheses were included by analogy with `HasGradientAt.fderiv_apply`, which genuinely needs them. This PR drops the hypotheses and rewrites the proofs through the isomorphism directly; no existing mathlib callers pass the now-redundant arguments.	t-analysis maintainer-merge	17/10	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	6	['FordUniver', 'Komyyy', 'github-actions']	urkud assignee:urkud	1	1-41550 1 day ago	7-51740 7 days ago	7-51733 7 days
36385	CoolRmal author:CoolRmal	feat: a sequential and countably compact space is sequentially compact	The main result proved in this PR is that a sequential and countably compact space is sequentially compact. We also prove some lemmas: 1. If `f` is an embedding, then `A` is sequentially compact iff `f '' A` is sequentially compact. This result is then used to show the equivalence of `IsSeqCompact A` and `SeqCompactSpace A`. 2. If `f` is inducing, then `A` is countably compact iff `f '' A` is countably compact. This result is then used to show the equivalence of `IsCountablyCompact A` and `CountablyCompactSpace A`. 3. If `f` converges and `g` is another function such that `g x ∈ closure {f x}` for all `x`, then `g` also converges. --- - [x] depends on: #36174 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	158/13	Mathlib/Topology/Compactness/CountablyCompact.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Sequences.lean,docs/references.bib	4	39	['ADedecker', 'CoolRmal', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'scholzhannah']	j-loreaux assignee:j-loreaux	1	1-39930 1 day ago	1-39930 1 day ago	41-66821 41 days
39307	FordUniver author:FordUniver	feat(Combinatorics/SimpleGraph/Copy): introduce `UnlabeledCopy` carrier subtype	Adds `abbrev UnlabeledCopy A B := {B' : B.Subgraph // Nonempty (A ≃g B'.coe)}` and uses it to replace the previous inline filter-set body of `copyCount G H`. Drops the now unused legacy Finset-image bridge `copyCount_eq_card_image_copyToSubgraph`. Adds `uniqueUnlabeledCopyBot` instance so `copyCount_bot` is a one-liner via `Fintype.card_unique`. --- Step 1/5 of the `Copy` / `InducedCopy` refactor-feat stack. This PR isolates the `UnlabeledCopy` type introduction and the count's type-form redefinition from the larger rename/convention work in the rest of the stack. Note that resolving the current clash in naming (`Copy` and `UnlabeledCopy` vs `labelledCopyCount` and `copyCount`) is part of #38745.	t-combinatorics	32/29	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	6	['FordUniver', 'github-actions', 'mathlib-bors', 'mitchell-horner']	nobody	1	1-38297 1 day ago	1-47581 1 day ago	5-47548 5 days
36954	FMLJohn author:FMLJohn	feat(Topology/ClosedBases): `TopologicalSpace.IsClosedBasis` and `TopologicalSpace.IsClosedSubbasis s`	In this pull request, I have defined closed bases and closed subbases of topologies, and proved some basic properties of them. ## Main definitions * `TopologicalSpace.IsClosedBasis s`: A closed basis of a topological space `α` is a collection of closed sets `s : Set (Set α)` such that every closed subset of `α` can be written as an intersection of elements of `s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	117/0	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ClosedBases.lean	3	19	['github-actions', 'scholzhannah']	urkud assignee:urkud	1	1-33288 1 day ago	25-60043 25 days ago	54-62362 54 days
39287	xgenereux author:xgenereux	feat(Localization/AtPrime/Basic): upgrade `equivQuotMaximalIdeal` to an AlgEquiv	The definition [IsLocalization.AtPrime.equivQuotMaximalIdealPow](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Localization/AtPrime/Basic.html#IsLocalization.AtPrime.equivQuotMaximalIdealPow) was added in #36783. The case with `n = 1` is still important and interesting. I have upgraded it to an AlgEquiv using `equivQuotMaximalIdealPow`. This did break a few small things, because we need to bridge back to a `RingEquiv` in some places. I took the liberty to add some missing `apply` lemmas to ease fixing these proofs. Disclaimer: I used Claude to suggest the first shot and refined it from there. María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	45/68	Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean	3	2	['github-actions', 'mathlib-merge-conflicts', 'wwylele']	nobody	1	1-18311 1 day ago	1-18312 1 day ago	4-53165 4 days
39202	FordUniver author:FordUniver	feat(Analysis/Calculus/Gradient): add toDual_gradient and companions	Add `toDual_gradient`, `toDual_gradientWithin`, and the composed variants `toDual_comp_gradient`, `toDual_comp_gradientWithin` — the natural inverse direction of the gradient's defining equation `∇ f x := (toDual 𝕜 F).symm (fderiv 𝕜 f x)`. These identify `(toDual 𝕜 F) (∇ f x)` with `fderiv 𝕜 f x` (and the `gradientWithin` and composed forms with the corresponding fderiv versions), making the Riesz isomorphism between the two derivative views explicit. The proofs of `DifferentiableAt.hasGradientAt` and `DifferentiableWithinAt.hasGradientWithinAt` in the same file are simplified to use them. --- Came up while formalizing the descent lemma for Lipschitz-smooth functions, where being able to switch between `LipschitzWith K (fderiv ℝ f)` and `LipschitzWith K (∇ f)` is helpful, which with this PR becomes `toDual_comp_gradient ▸ (toDual ℝ F).isometry.lipschitzWith_iff K`. Also slightly simplifies two call sites in mathlib.	maintainer-merge	20/5	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	5	['FordUniver', 'Komyyy', 'github-actions']	nobody	1	1-17454 1 day ago	7-51214 7 days ago	7-51371 7 days
37521	jessealama author:jessealama	feat(Data/Part): add Part.bind_eq_some_iff	Add `Part.bind_eq_some_iff`, the `Part` analogue of `Option.bind_eq_some_iff`. Noticed this small gap while working on some equivalence proofs with partial functions.	t-data	6/0	Mathlib/Data/Part.lean	1	6	['github-actions', 'jessealama', 'joneugster', 'vihdzp']	joneugster assignee:joneugster	1	1-8099 1 day ago	1-8130 1 day ago	43-51356 43 days
39183	yuanyi-350 author:yuanyi-350	refactor(Analysis): golf `Mathlib/Analysis/Complex/Exponential`	- shortens the reindexing step in `norm_exp_sub_sum_le_norm_mul_exp` by switching from `sum_bij` to `sum_Ico_eq_sum_range` with `simp` Extracted from #37968 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-analysis LLM-generated maintainer-merge	8/23	Mathlib/Analysis/Complex/Exponential.lean	1	4	['Komyyy', 'github-actions', 'yuanyi-350']	urkud assignee:urkud	1	0-83770 23 hours ago	0-83958 23 hours ago	7-65559 7 days
39439	NoahW314 author:NoahW314	feat: add `LinearMap.restrictScalars_mul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory maintainer-merge	11/5	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean	3	9	['NoahW314', 'eric-wieser', 'github-actions', 'leanprover-radar', 'tb65536']	tb65536 assignee:tb65536	1	0-79203 22 hours ago	2-18115 2 days ago	3-24969 3 days
36910	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory): 4 and 5 lemmas for ComposableArrows n	Adds versions of the 4 and 5 lemmas for morphisms in `ComposableArrows n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory maintainer-merge	83/2	Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Four.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean	3	32	['Brian-Nugent', 'dagurtomas', 'erdOne', 'github-actions', 'robin-carlier']	adamtopaz assignee:adamtopaz	1	0-77562 21 hours ago	5-27092 5 days ago	40-74990 40 days
37624	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Maps): add theorems about composition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	32/5	Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	11	['IvanRenison', 'YaelDillies', 'github-actions']	nobody	1	0-67101 18 hours ago	2-35290 2 days ago	43-72077 43 days
39385	ocfnash author:ocfnash	chore: define `Complex.UnitDisc` using `Subsemigroup.unitBall`	The motivation is to have some local consistency between the definitions of `Circle` and `Complex.UnitDisc`. At the moment, there is a mild style inconsistency since `Circle` uses `Submonoid.unitSphere` whereas `Complex.UnitDisc` uses a raw `Metric.ball`. The background is that we are about to add `Complex.closedUnitDisc` and so the question arose about which pattern to follow. I decided that we should follow `Circle` and bring `Complex.UnitDisc` in line. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy t-analysis	5/1	Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Normed/Field/UnitBall.lean	2	6	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	1	0-66780 18 hours ago	4-34675 4 days ago	4-36636 4 days
38319	Zetetic-Dhruv author:Zetetic-Dhruv	feat(Combinatorics/SetFamily): Assouad's dual VC bound	Adds the Finset-level form of Assouad's 1983 dual VC bound: if a family `𝒜 : Finset (Finset α)` has VC dimension at most `d`, then for any ground set `X : Finset α` the dual family `{𝒜.filter (· ∋ x) : x ∈ X}` has VC dimension at most `2 ^ (d + 1) - 1`. New declarations (in `Finset` namespace): - `dualFamily 𝒜 X`: for each `x ∈ X`, the subfamily `{A ∈ 𝒜 \| x ∈ A}` - `mem_dualFamily` (`@[simp]`): membership characterisation - `exists_shatters_of_dualFamily_shatters`: Assouad's bitstring-coding lemma - `vcDim_dualFamily_le`: the headline VC bound Proof by Assouad's classical bitstring-coding argument. Sits on top of `Finset.shatterer` / `Finset.vcDim` from `Mathlib.Combinatorics.SetFamily.Shatter`. References: - P. Assouad, Densite et dimension, Ann. Inst. Fourier 33(3) (1983), Thm 2.13 - J. Matousek, Lectures on Discrete Geometry, GTM 212, Springer, 2002, Section 10.3 Lemma 10.3.3 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	199/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/DualVC.lean,docs/references.bib	3	35	['Shreyas4991', 'YaelDillies', 'Zetetic-Dhruv', 'github-actions']	nobody	1	0-62860 17 hours ago	9-26287 9 days ago	25-73329 25 days
36832	KryptosAI author:KryptosAI	chore(Data/Finset/Card): rename `pred_card_le_card_erase` to `sub_one_card_le_card_erase`	## Summary The name `pred_card_le_card_erase` suggests `Nat.pred` but the statement uses `- 1` (i.e., `Nat.sub 1`). Rename to `sub_one_card_le_card_erase` to match the actual statement. A deprecated alias is added for backwards compatibility. ### Files changed - `Mathlib/Data/Finset/Card.lean` — definition renamed + deprecated alias - `Mathlib/Data/Finset/Powerset.lean` — reference updated - `Mathlib/Combinatorics/Additive/SubsetSum.lean` — reference updated - `Mathlib/Algebra/Polynomial/EraseLead.lean` — reference updated Addresses the `Finset.pred_card_le_card_erase` item in #21584. ## AI disclosure I used Claude Code to explore the codebase (finding all references to rename) and to draft the PR description. I reviewed and understand all changes — these are straightforward renames with a deprecated alias.	new-contributor awaiting-author	22/15	Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Combinatorics/Additive/SubsetSum.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Combinatorics/SetFamily/Shadow.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/RingTheory/Ideal/Operations.lean	9	8	['KryptosAI', 'Multramate', 'dagurtomas', 'github-actions', 'mattrobball', 'ooovi']	nobody	1	0-58485 16 hours ago	0-58485 16 hours ago	59-48094 59 days
39055	vihdzp author:vihdzp	chore: deprecate `not_lt_zero'` and `bot_eq_zero''`	Two easy pickings from #38663. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	24/37	Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/IsBotOne.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/List/Shortlex.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/Topology/MetricSpace/PiNat.lean	11	6	['YaelDillies', 'github-actions', 'leanprover-radar', 'riccardobrasca', 'vihdzp']	nobody	1	0-46145 12 hours ago	11-19816 11 days ago	11-19809 11 days
39260	sharky564 author:sharky564	feat(Topology/Algebra/Module/Complement): bundle `prodEquivOfIsCompl` and `quotientEquivOfIsCompl`, add `ContinuousLinearMap.ofIsTopCompl`	This PR completes the three TODO items listed at the top of `Mathlib/Topology/Algebra/Module/Complement.lean` (introduced in #38547). `Submodule.prodEquivOfIsCompl` is shown to be a homeomorphism if and only if the two submodules are topological complements. The analogous characterisation for `Submodule.quotientEquivOfIsCompl` is also provided, and `ContinuousLinearMap.ofIsTopCompl` is defined as the continuous version of `LinearMap.ofIsCompl`, taking continuous linear maps from complementary submodules and producing the induced continuous linear map on the whole space. ---	t-topology new-contributor	160/20	Mathlib/LinearAlgebra/Projection.lean,Mathlib/Topology/Algebra/Module/Complement.lean	2	53	['ADedecker', 'github-actions', 'sharky564', 'themathqueen']	themathqueen assignee:themathqueen	2	0-40523 11 hours ago	2-53666 2 days ago	5-55295 5 days
38906	lua-vr author:lua-vr	feat(ConditionallyCompleteLattice/Indexed): add binary versions of lemmas	Add binary versions of some of the lemmas. Those are useful when the domain is indexed over the members of a set. From the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order carleson	22/1	Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	1	18	['JovanGerb', 'SnirBroshi', 'github-actions', 'grunweg', 'lua-vr', 'mathlib-merge-conflicts']	nobody	1	0-26973 7 hours ago	0-56688 15 hours ago	9-60313 9 days
39547	Hagb author:Hagb	chore(Order/Preorder/Finite): use `@[to_dual]` on lemmas about `{Min,Max}imal{For,}`	Proofs of other theorems with dual theorems dependent on these lemmas would benefit from their duality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/25	Mathlib/Order/Preorder/Finite.lean	1	3	['github-actions', 'vihdzp']	nobody	1	0-23067 6 hours ago	0-32004 8 hours ago	0-31997 8 hours
28613	espottesmith author:espottesmith	feat(Combinatorics): define undirected hypergraphs	This PR defines undirected hypergraphs: ``` @[ext] structure Hypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The hyperedge set -/ hyperedgeSet : Set (Set α) /-- All hyperedges must be subsets of the vertex set -/ hyperedge_isSubset_vertexSet : ∀ ⦃e⦄, e ∈ hyperedgeSet → e ⊆ vertexSet ``` In addition to the main definition, some additional definitions and related lemmas are provided: - vertex adjacency - hyperedge adjacency - vertex "stars" - special cases (loops, empty hypergraphs, trivial hypergraphs, complete hypergraphs, simple hypergraphs, k-uniform hypergraphs, and d-regular hypergraphs) - (some) hypergraph cardinality - subhypergraphs, induced subhypergraphs, and partial hypergraphs This implementation is certainly bare-bones. I'm submitting this PR at this point, rather than when my developments are more fleshed out, because there has been some interest in others contributing to hypergraph formalization in mathlib. In the near future, goals include: - defining incidence matrices (i.e., conversion from `Hypergraph α` to `Matrix α (Set α) β` - coersion/generalization of graph as 2-uniform hypergraph - conversion of a hypergraph into its associated clique graph/two-section graph - constructing the dual of a hypergraph (note: on first blush, this appears somewhat challenging, given that we define hyperedges as `Set α` rather than some other type `β`) - rank and co-rank - walks, paths, cycles, etc. on hypergraphs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	277/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	150	['SnirBroshi', 'b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot', 'tb65536']	b-mehta assignee:b-mehta	1	0-19988 5 hours ago	0-19988 5 hours ago	94-73810 94 days
33928	jsm28 author:jsm28	feat(Combinatorics/Tiling/TileSet): indexed families of tiles	Define the type `TileSet` for indexed families of tiles (in a discrete context), and some associated definitions (including `symmetryGroup`) and API lemmas. `TileSet` can be used for tilings of the whole space; for tilings of part of the space; for patches of tiles (extracted from a tiling by considering tiles meeting some set of points, or considered on their own without extracting from a tiling); for multiple tilings (covering the space more than once). In particular, the fact that people study multiple tilings provides a clear justification for using indexed families rather than sets of tiles, and basic definitions and API lemmas generally work for all these different uses of `TileSet` (sometimes with weak constraints such as tiles being finite, nonempty and only having finitely many tiles meeting any point of the space). Definitions for saying e.g. "this `TileSet` is a tiling of the whole space" are to be included in subsequent files in subsequent PRs. From AperiodicMonotilesLean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	460/0	Mathlib.lean,Mathlib/Combinatorics/Tiling/TileSet.lean	2	23	['Parcly-Taxel', 'b-mehta', 'eric-wieser', 'github-actions', 'jsm28', 'vihdzp']	nobody	1	0-13668 3 hours ago	125-30776 125 days ago	125-30769 125 days
37443	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk/Operations): permutations of support	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	17/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	6	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts']	b-mehta assignee:b-mehta	1	0-12203 3 hours ago	7-71461 7 days ago	47-56730 47 days
39380	JonBannon author:JonBannon	feat(Topology/Algebra/Module): add `ClosedComplemented.of_closedComplement_finiteDimensional`	Submodules of finite-dimensional closed, complemented submodules are closed and complemented. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	8/0	Mathlib/Topology/Algebra/Module/FiniteDimension.lean	1	17	['ADedecker', 'JonBannon', 'github-actions', 'mathlib-bors', 'themathqueen']	dagurtomas assignee:dagurtomas	1	0-12194 3 hours ago	3-22624 3 days ago	3-35522 3 days

All open PRs

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
14720	eric-wieser author:eric-wieser	refactor: change `CliffordAlgebra.lift` to use quadratic maps	This works towards addressing a footnote on [page 152](https://eric-wieser.github.io/thesis/eric-wieser-thesis.pdf#page=164) of my thesis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	200/167	Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Equivs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/QuadraticForm/Isometry.lean,Mathlib/LinearAlgebra/QuadraticForm/IsometryEquiv.lean,Mathlib/LinearAlgebra/QuadraticForm/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat.lean,Mathlib/LinearAlgebra/QuadraticForm/Real.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean	11	1	['github-actions']	nobody	656-74038 1 year ago	unknown	0-0 0 seconds
14889	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Bicategory/Monad): define monad in bicategory	--- - [ ] depends on: #12107 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR t-category-theory	1566/12	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Oplax.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Monad/Adjunction.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/Bicategory/Monad/Cat.lean,Mathlib/CategoryTheory/Monad/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/Widget/StringDiagram.lean,scripts/noshake.json,test/StringDiagram.lean,widget/src/penrose/monoidal.dsl,widget/src/penrose/monoidal.sty	14	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74038 1 year ago	unknown	0-0 0 seconds
13847	alreadydone author:alreadydone	feat(EllipticCurve): the universal elliptic curve	+ Define the universal Weierstrass curve (`Universal.curve`) over the polynomial ring `ℤ[A₁,A₂,A₃,A₄,A₆]`, and the universal pointed elliptic curve (`Universal.pointedCurve`) over the field of fractions (`Universal.Field`) of the universal ring `ℤ[A₁,A₂,A₃,A₄,A₆,X,Y]/⟨P⟩ = Universal.Poly/⟨P⟩` (`Universal.Ring`, where `P` is the Weierstrass polynomial) with distinguished point `(X,Y)`. + Given a Weierstrass curve `W` over a commutative ring `R`, we define the specialization homomorphism `W.specialize : ℤ[A₁,A₂,A₃,A₄,A₆] →+* R`. If `(x,y)` is a point on the affine plane, we define `W.polyEval x y : Universal.Poly →+* R`, which factors through `W.ringEval x y : Universal.Ring →+* R` if `(x,y)` is on `W`. + Introduce the cusp curve `Y² = X³`, on which lies the rational point `(1,1)`, with the nice property that `ψₙ(1,1) = n`, making it easy to prove nonvanishing of the universal `ψₙ` when `n ≠ 0` by specializing to the cusp curve, which shows that `(X,Y)` is a point of infinite order on the universal pointed elliptic curve. --- - [x] depends on: #13845 - [x] depends on: #12883 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-algebraic-geometry label:t-algebra$	543/208	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean	6	4	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74037 1 year ago	unknown	0-0 0 seconds
14036	adomani author:adomani	Test/decl diff in lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	465/1040	.github/workflows/Lean_decl_diff.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	1	['github-actions']	nobody	656-74037 1 year ago	unknown	0-0 0 seconds
12952	adomani author:adomani	test: length statistics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP test-ci	124/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/mathlib_stats.sh	3	9	['github-actions']	nobody	656-74036 1 year ago	unknown	0-0 0 seconds
13297	urkud author:urkud	feat(Semicontinuous): add `comp` lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	31/13	Mathlib/Topology/Semicontinuous.lean	1	3	['sgouezel', 'urkud']	nobody	656-74036 1 year ago	720-74734 720 days ago	0-18201 5 hours
13372	adomani author:adomani	dev: generic replacement	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	446/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ReplaceRefine.lean,Mathlib/Tactic/Replacements.lean	4	4	['adomani', 'github-actions']	nobody	656-74036 1 year ago	unknown	0-0 0 seconds
13512	adomani author:adomani	test: count all	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Tally.lean	4	0	[]	nobody	656-74036 1 year ago	unknown	0-0 0 seconds
12416	adomani author:adomani	chore: remove some cdots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3830/3239	Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Counterexamples/Cyclotomic105.lean,Counterexamples/DirectSumIsInternal.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/List/Basic.lean,Mathlib/Algebra/Category/GroupCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Homology/Exact.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Homology/TotalComplex.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Int.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/TangentCone.lean	608	0	[]	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12465	rosborn author:rosborn	style: Change Subtype.val to (↑)	--- This is a test to see replacing `Subtype.val` with `(↑)` where appropriate. After performing the rewrite, some of the types subtly changed in a difficult to detect manner. Before the change, `openEmbedding' _` had type `OpenEmbedding Subtype.val` where `Subtype.val` expanded as `@Subtype.val α fun x ↦ x ∈ U : ↥U → α`. After the change, `Subtype.val` expands to `@Subtype.val α fun x ↦ x ∈ ↑U : { x // x ∈ ↑U } → α`. This caused some later proofs to fail due to the different definition. In a similar case, within the proof of `mfderiv_coe_sphere_injective` on line 553 `Subtype.val` expanded as `@Subtype.val E fun x ↦ x ∈ (Submodule.span ℝ {↑(-v)})ᗮ : ↥(Submodule.span ℝ {↑(-v)})ᗮ → E`. After changing to `(↑)`, it expanded to `@Subtype.val E fun x ↦ x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ : { x // x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ } → E`. One benefit to using `(↑)` was that it lead to a shorter proof as `ContinuousLinearEquiv.coe_coe` could be removed on line 559. In general, this subtle change in types is basically impossible to detect without a tool like leaff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	50/50	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/CategoryTheory/Generator.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/Order/Directed.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	28	1	['eric-wieser', 'rosborn']	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12473	adomani author:adomani	first translations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	424/265	Mathlib.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean	5	0	[]	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12528	adomani author:adomani	test: autotranslations Bot --> Top	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	350/294	Mathlib.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean,test/MinMax.lean	5	0	[]	nobody	656-74035 1 year ago	749-23073 749 days ago	0-4 4 seconds
12588	adomani author:adomani	remove trailingDegree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1280/979	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Mirror.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMax.lean,Mathlib/Tactic/MinMaxTwo.lean,test/MinMax.lean	11	0	[]	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-meta label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	656-74035 1 year ago	746-20054 746 days ago	0-84 1 minute
12637	adomani author:adomani	translation: MonoidAlgebra to AddMonoidAlgebra	[Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/merge.20Add-MonoidAlgebra) * #12646 was found as a consequence of unification. * #12659 the typo `single 1 1` for `single 0 1`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-meta label:t-algebra$	615/986	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinMaxTwo.lean,scripts/noshake.json	7	0	[]	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12679	MichaelStollBayreuth author:MichaelStollBayreuth	perf(NumberTheory/RamificationInertia): speed up slow file	A repetition of the earlier experiment at [#12412](https://github.com/leanprover-community/mathlib4/pull/12412) with Lean 4.8.0-rc1. This time, I tried not to introduce local instances if possible, but instead to tweak instance priorities. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	57/14	Mathlib/NumberTheory/RamificationInertia.lean	1	3	['MichaelStollBayreuth', 'github-actions', 'leanprover-bot']	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
12984	adomani author:adomani	Adomani/periodic reports dev custom action	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP test-ci	366/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	69	['github-actions']	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
13057	alreadydone author:alreadydone	feat(NumberTheory): characterize elliptic divisibility sequences	Main results: + Every `normEDS` is an elliptic divisibility sequence (EDS). The key proof is `rel₄_of_anti_oddRec_evenRec`, based on my original argument first published on [MathSE](https://math.stackexchange.com/a/4903422/12932) + Conversely, every EDS is equal to some `normEDS` (assuming that the first two terms are not zero divisors) --- - [ ] depends on: #13155 - [x] depends on: #13153 - [x] depends on: #10843 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	1032/55	Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Int/Defs.lean,Mathlib/Data/Int/Parity.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	5	6	['Multramate', 'alreadydone', 'kbuzzard', 'leanprover-community-mathlib4-bot']	nobody	656-74035 1 year ago	725-12063 725 days ago	0-34672 9 hours
12192	Ruben-VandeVelde author:Ruben-VandeVelde	feat: generalize isLittleO_const_id_atTop/atBot	From PNT+. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	10/4	Mathlib/Analysis/Asymptotics/Asymptotics.lean	1	6	['Ruben-VandeVelde', 'llllvvuu', 'urkud']	nobody	656-74034 1 year ago	761-9730 761 days ago	1-21749 1 day
10024	ADedecker author:ADedecker	feat: rename `connectedComponentOfOne` to `identityComponent`, prove that it is normal and open	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology awaiting-CI	58/24	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Connected/Basic.lean	5	0	[]	nobody	656-74033 1 year ago	843-66157 843 days ago	0-832 13 minutes
10521	eric-wieser author:eric-wieser	chore: generalize `IsBoundedLinearMap` to modules	Most of the lemmas don't actually need the normed on the scalars at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	58/42	Mathlib/Analysis/NormedSpace/BoundedLinearMaps.lean	1	3	['github-actions', 'j-loreaux', 'urkud']	nobody	656-74033 1 year ago	823-42083 823 days ago	1-29105 1 day
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order t-logic	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	656-74033 1 year ago	706-52435 706 days ago	64-12984 64 days
10845	Shamrock-Frost author:Shamrock-Frost	Refactor: Make MonoidalFunctor carry the data of an inverse	We change the definition of a strong monoidal functor from a lax monoidal functor for which the unitor and tensorator are `IsIso` to a lax monoidal functor with the data of inverses for the unitor and tensorator. This requires fixing a lot of knock on effects. --- This is a draft PR. I would like to talk with people on zulip before merging it, and plan ahead to when we have oplax/colax monoidal functors as well. I'm not sure the approach I took here where `MonoidalFunctor` inherits from `LaxMonoidalFunctor` is a good choice if we want to be lax/oplax symmetric. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP RFC t-category-theory	3799/1589	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Adjunction/Prod.lean,Mathlib/CategoryTheory/Adjunction/Whiskering.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Bicategory/SingleObj.lean,Mathlib/CategoryTheory/CatCommSq.lean,Mathlib/CategoryTheory/CatSquares.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Monoidal/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Rigid/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Rigid/OfEquivalence.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Products/Associator.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/Pullback.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/RepresentationTheory/Action/Monoidal.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Rep.lean	41	7	['Shamrock-Frost', 'joelriou']	nobody	656-74033 1 year ago	unknown	0-0 0 seconds
11100	eric-wieser author:eric-wieser	feat(CategoryTheory/Limits): add `Functor.mapBinaryBiconeInv`	--- - [ ] depends on: #11130 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) It's tempting to try to prove something like ```lean theorem Functor.mapBinaryBiconeInv_toCone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCone = (e.mapConeInv <\| (Cones.postcompose (pairComp X Y e).symm.hom).obj b.toCone) := by simp sorry theorem Functor.mapBinaryBiconeInv_toCocone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCocone = (e.mapCoconeInv <\| (Cocones.precompose (pairComp X Y e).hom).obj b.toCocone) := by sorry ``` but maybe equality is evil here	merge-conflict t-category-theory awaiting-CI	52/0	Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Biproducts.lean	3	6	['TwoFX', 'eric-wieser', 'leanprover-community-mathlib4-bot']	nobody	656-74033 1 year ago	unknown	0-0 0 seconds
8503	thorimur author:thorimur	feat: meta utils for `refine?`	This PR introduces some metaprogramming infrastructure and utilities that are necessary for `refine?` (#8364). * `elabTermWithHoles'` (and `withCollectingNewGoalsFrom'`): a more configurable version of `elabTermWithHoles`, which allows: preserving the initial mvar type; not tagging untagged goals; and postponing mvars. * Some `Syntax` and `TSyntax` functionality, including: * `TSyntax.map`(`M`), for acting on `TSyntax` with functions `f : Syntax -> (m) Syntax` * Range operations: `includes` and `isEqByRange` * `setTrailingInfoBy?` and `unsetOriginalTrailing`, which is like `unsetTrailing`, but behaves as expected. * `Term.withoutModifyingState`, which does not allow unknown mvarIds to escape via the infotree * `hasNewErrors`, which runs a monad computation and returns the value along with `true` or `false` depending on whether new error messages have been logged * the option `pp.anonymousMVarSuffixes`, which can be set to `false` to replace all numeric suffixes of anonymous mvars with `✝`, which is useful in tandem with `#guard_msgs` for tests (but is essentially a workaround—although it can make some tactic states more legible). --- I'm open to suggestions on the location and name of the option/delaborator used for trimming the numeric suffixes of anonymous mvar names (which is used in the tests)—including whether or not it should exist in the first place, as it's essentially just a workaround. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	312/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean	6	2	['kmill', 'thorimur']	kmill assignee:kmill	656-74032 1 year ago	873-46356 873 days ago	38-46649 38 days
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	53/50	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	3	28	['bustercopley', 'eric-wieser', 'jcommelin', 'jjaassoonn', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	nobody	656-74032 1 year ago	896-39395 896 days ago	5-6524 5 days
8582	eric-wieser author:eric-wieser	wip	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean	2	4	['eric-wieser', 'leanprover-bot']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
8616	eric-wieser author:eric-wieser	feat(Algebra/FreeAlgebra): add right action and `IsCentralScalar`	--- - [ ] depends on: #8652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	30/8	Mathlib/Algebra/FreeAlgebra.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	904-21574 904 days ago	2-25170 2 days
8658	eric-wieser author:eric-wieser	feat: support right actions for `Con`	This adds a new `Con.CompatibleSMul` typeclass that captures exactly the condition when `smul` descends to the quotient. I was not quite able to merge this with `MulAction.QuotientAction`: * The imports are such that the congruence relation `QuotientGroup.con` is not yet available in that file * `QuotientGroup.con` requires the subgroup to be normal, while `MulAction.QuotientAction` does not --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	80/18	Mathlib/GroupTheory/Congruence.lean,Mathlib/RingTheory/Congruence.lean	2	6	['YaelDillies', 'eric-wieser']	nobody	656-74032 1 year ago	873-39679 873 days ago	29-65537 29 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	237/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	6	4	['FMLJohn', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	896-63928 896 days ago	1-57831 1 day
8906	jjaassoonn author:jjaassoonn	feat: add some missing lemmas about linear algebra	--- - [ ] depends on: #8905 [lifting injective modules to higher universe] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	45/1	Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/LinearAlgebra/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean	4	21	['AntoineChambert-Loir', 'alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	892-47126 892 days ago	0-343 5 minutes
8961	eric-wieser author:eric-wieser	refactor: use the coinduced topology on ULift	--- - [x] depends on: #8958 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict awaiting-author awaiting-CI	46/14	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Constructions.lean	3	6	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	656-74032 1 year ago	890-19462 890 days ago	0-1 1 second
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-topology label:t-algebra$	55/3	Mathlib.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Instances/ZMod.lean,Mathlib/Topology/Maps.lean	5	61	['YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'laughinggas', 'mo271', 'urkud']	nobody	656-74032 1 year ago	863-32123 863 days ago	7-11053 7 days
9229	eric-wieser author:eric-wieser	refactor(Algebra/GradedMonoid): Use `HMul` to define `GMul`	This make the notation much nicer, but I'm pretty sure this is a bad idea for performance / ambiguity reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	114/125	Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/GradedMulAction.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean	11	6	['eric-wieser', 'leanprover-bot']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9252	FR-vdash-bot author:FR-vdash-bot	chore: remove redundant covariance instances, add priority	I noticed that the following code is surprisingly slow. ``` lean import Mathlib count_heartbeats in example {n : ℕ} : CovariantClass (Fin (n + 1)) (Fin (n + 1)) (· + ·) (· < ·) := by try infer_instance sorry ``` This PR removed some redundant instances. The heartbeats have dropped from 19118 to 11450 (still too slow). Lean4 still seems to make some redundant attempts. See also https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-order merge-conflict slow-typeclass-synthesis awaiting-author label:t-algebra$	40/32	Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Four.lean	4	8	['astrainfinita', 'leanprover-bot', 'urkud']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9354	chenyili0818 author:chenyili0818	feat: monotonicity of gradient on convex real-valued functions	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	540/0	Mathlib.lean,Mathlib/Analysis/Convex/ConvexFunction.lean	2	15	['github-actions', 'winstonyin']	nobody	656-74032 1 year ago	847-18258 847 days ago	23-36394 23 days
9356	alexjbest author:alexjbest	feat: assumption?	A little helper for replacing `assumption`s with `exact` statements quickly --- If this is approved I will add tests This begs the question of whether it might simply be better to add some sort of code action for "replace with trythis output" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	24/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/TryAssumption.lean	4	5	['alexjbest', 'j-loreaux', 'jcommelin']	nobody	656-74032 1 year ago	851-23630 851 days ago	19-26336 19 days
9469	dupuisf author:dupuisf	feat: maximum modulus principle for functions vanishing at infinity	This PR adds versions of the maximum modulus principle for functions vanishing at infinity that parallel those we already had for functions over a bounded set. These will have applications in e.g. norm interpolation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-analysis	71/0	Mathlib/Analysis/Complex/AbsMax.lean	1	8	['dupuisf', 'j-loreaux']	nobody	656-74032 1 year ago	851-28878 851 days ago	12-86009 12 days
9482	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add `LaxMonoidalStruct`	Add a `LaxMonoidalStruct` with only the unit morphism `ε` and the tensorator `μ`. This is used in #6307 to provide two different constructors for `LaxMonoidal` that have common `ε` and `μ` but use the tensor of morphisms or the whiskerings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	21/8	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Monoidal/Functorial.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean	3	0	[]	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9487	eric-wieser author:eric-wieser	feat: the exponential of dual numbers over non-commutative rings	This is a work in progress, as I don't know my way around the measure theory library. --- - [x] depends on: #9489 - [x] depends on: #9486 - [x] depends on: #10427 - [ ] depends on: #10452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-measure-probability merge-conflict t-analysis label:t-algebra$	97/0	Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean	1	7	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9504	alreadydone author:alreadydone	chore: remove some IsSeparable assumptions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	41/14	Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/RingTheory/Norm.lean	2	0	[]	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9510	eric-wieser author:eric-wieser	feat(Analysis/Calculus/DualNumber): Extending differentiable functions to dual numbers	This shows that this operation preserves multiplication and composition --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-analysis awaiting-CI label:t-algebra$	119/0	Mathlib/Analysis/Calculus/DualNumber.lean	1	4	['github-actions']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9570	eric-wieser author:eric-wieser	feat(Algebra/Star): Non-commutative generalization of `StarModule`	[Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Star.20modules.20over.20non-commutative.20scalars/near/383664005). Until we address #7152, we have to have both `StarModule` and `StarModule'`. To prove this generalization is useful, this shows that with it as an assumption, `TrivSqZeroExt` is a `StarRing`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-CI label:t-algebra$	66/6	Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Prod.lean,Mathlib/Algebra/TrivSqZeroExt.lean	4	0	[]	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9642	eric-wieser author:eric-wieser	refactor(Analysis/Normed/{Group/Field}/Basic): Let `extends` generate the repeated fields	New-style structure shenanigans mean that instance constructors randomly complain about a missing field that can be found with `__ : MetricSpace _ := infer_instance`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I will write a longer PR description for this once CI is happy	WIP merge-conflict awaiting-author help-wanted t-analysis	122/202	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Order/Basic.lean,Mathlib/Analysis/NormedSpace/ProdLp.lean,Mathlib/Analysis/NormedSpace/Star/Matrix.lean,Mathlib/Analysis/NormedSpace/Unitization.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	17	11	['eric-wieser', 'leanprover-bot', 'urkud']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
6580	adomani author:adomani	chore: `move_add`-driven replacements	This PR accompanies #6576 and uses `move_add/mul` to simplify/streamline a selection of proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	12/13	Counterexamples/Monic_nonRegular.lean,Mathlib/Algebra/Associated.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean	4	0	[]	nobody	656-74031 1 year ago	942-36795 942 days ago	62-34247 62 days
6630	MohanadAhmed author:MohanadAhmed	feat: Reduced Spectral Theorem	For A hermitian matrix $A : n \times n$ with rank $A.rank \leq n$, we can eliminate the zero eigenvalues and their corresponding eigenvectors from the (alternate) spectral theorem. As such the matrix $A$ can be written as: $$A = V₁ D V₁ᴴ$$ where - $V₁$ : $n \times r$ is the matrix of eigenvector with non-zero associated eigenvalues. - $D$ is $r \times r$ is the diagonal matrix containing only non-zero eigenvalues on its main diagonal. with $r = A.rank$ being the rank of the matrix Towards that goal we make several equivalence definitions: - `{i // hA.eigenvalues i ≠ 0} ≃ Fin (A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (r - 1). - `{i // ¬ hA.eigenvalues i ≠ 0} ≃ Fin (n - A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (n - r - 1). - `{i // hA.eigenvalues i ≠ 0} ⊕ {i // ¬hA.eigenvalues i ≠ 0} ≃ n`: the index set of the matrix (together with the associated eigenvector matrix and eigenvalues matrix ) can be partitioned into two complement groups the ones corresponding to non-zero eigenvalues and the ones corresponding to zero eigenvalues. - We can then put the previous definitions together to obtain a: `Fin (A.rank) ⊕ Fin (Fintype.card n - A.rank) ≃ n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	31/0	Mathlib/LinearAlgebra/Matrix/Spectrum.lean	1	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	37	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel', 'vihdzp']	nobody	656-74031 1 year ago	931-39528 931 days ago	35-63136 35 days
6791	eric-wieser author:eric-wieser	refactor: Use flat structures for morphisms	This restores the symmetry we had in Lean3, where we had `MonoidHom.mk f one mul` not `MonoidHom.mk (OneHom.mk f one) mul`, and `f.toFun` wasn't notation for `f.toMulHom.toFun`. The nesting provided by the previous inheritance is useless to us in the face of `MonoidHomClass.toMonoidHom`, which completely eta-expands the structure anyway. We call the class `FunLikeFlatHack._` because this means the field is called `to_` which uses up less space in the goal view than any alternative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted awaiting-CI	174/201	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/ZModuleEquivalence.lean,Mathlib/Algebra/Category/GroupWithZeroCat.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group/Defs.lean,Mathlib/Algebra/Hom/GroupAction.lean,Mathlib/Algebra/Hom/NonUnitalAlg.lean,Mathlib/Algebra/Hom/Ring/Defs.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/Normed/Group/SemiNormedGroupCat.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Real/EReal.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/RingTheory/RingInvo.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/MetricSpace/Dilation.lean	32	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6930	kmill author:kmill	feat: `resynth_instances` tactic for resynthesizing instances in the goal or local context	This tactic can be useful for debugging non-canonical instances or for fixing up goals and hypotheses after using the `classical` tactic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	327/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ResynthInstances.lean,test/ResynthInstances.lean	4	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6931	urkud author:urkud	refactor(Analysis/Normed): use `RingHomIsometric` for `.norm_cast`	--- I don't understand why linter fails. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-analysis	78/68	Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7225	jjaassoonn author:jjaassoonn	some random stuff	- Consider two commutative rings `R` and `S` and `X` and `(R, S)`-bimodule. Consider the tensor functor `(X ⊗[R] .)` from the category of `R`-modules to the category of `S`-modules and the hom functor `X →ₗ[S] .` from the category of `S`-modules to the category of `R`-modules, they form an adjunction. - direct limits of modules commute with tensor product - A proof of ![00HD](https://stacks.math.columbia.edu/tag/00HD) Three definitions for flatness: 1. in terms of injectiveness ```lean def Flat.injective : Prop := ∀ ⦃N N' : ModuleCat.{u} R⦄ (L : N ⟶ N'), Function.Injective L → Function.Injective ((tensorRight (ModuleCat.of R M)).map L) ``` 2. in terms of ideals ```lean def Flat.ideal : Prop := ∀ (I : Ideal R), Function.Injective (TensorProduct.lift ((lsmul R M).comp I.subtype)) ``` 3. in terms of finitely generated ideal ```lean def Flat.fg_ideal : Prop := ∀ ⦃I : Ideal R⦄ (_ : I.FG), Function.Injective (TensorProduct.lift ((lsmul R M).comp I.subtype)) ``` and they are all equivalent: ```lean lemma tfae : List.TFAE [ Flat.injective R M, Flat.ideal R M, Flat.fg_ideal R M ] := by ``` The dependencies between these changed files are: ``` Algebra.Module.LinearMap--------------------------------- \| \| \| \| v v Algebra.Category.ModuleCat.TensorProduct -----> Algebra.Character \| \| \| v Algebra.DirectLimitAndTensorProduct -------------> RingTheory.Flat ``` to prove equivalence of other definitions, e.g. exact functor, tor, etc should be easier with this because the proof is will be categorical --- ------------- Some other stuff not about flatness 1. If $S$ is a submonoid and $I$ is maximally disjoint from $S$ then $I$ is prime 2. if $\mathfrak p$ is a minimal prime, then $x \in \mathfrak p$ implies that $x$ is a zero divisor 3. Noetherian rings has only finitely many minimal ideals 4. One version of [the prime avoidance lemma](https://en.wikipedia.org/wiki/Prime_avoidance_lemma): if $E$ is an addsubgroup of a ring and is mutiplicatively closed, and $\mathfrak p_i$ is some prime ideals, then not being any subset of the individual prime ideal implies that not being a subset of their union ---------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1828/16	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorProduct.lean,Mathlib/Algebra/Character.lean,Mathlib/Algebra/DirectLimitAndTensorProduct.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Noetherian.lean,Mathlib/CategoryTheory/Functor/Fin.lean,Mathlib/CategoryTheory/ShortExactSequence.lean,Mathlib/RingTheory/Flat.lean,Mathlib/RingTheory/Ideal/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime.lean,Mathlib/RingTheory/Ideal/PrimeAvoidance.lean	13	6	['eric-wieser', 'jjaassoonn']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7227	kmill author:kmill	feat: flexible binders and integration into notation3	Introduces `flexibleBinders`, which is an extensible system for binder notations that allow destructuring, bounded domains, and other niceties. Integrates this into `notation3`, and makes `Finset.sum`/`Finset.prod` use it. --- - [ ] depends on: #6833 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	1215/131	Mathlib.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Mathport/Notation.lean,Mathlib/Util/FlexibleBinders.lean,Mathlib/Util/FlexibleBindersFinset.lean,Mathlib/Util/SyntaxFun.lean,test/FlexibleBinders.lean,test/notation3.lean	10	3	['eric-wieser', 'kmill', 'leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7351	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend function on `Ioo` to `Icc`	Extend a strictly monotone function defined on an open interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-order	59/0	Mathlib.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	3	7	['j-loreaux', 'shuxuezhuyi']	nobody	656-74031 1 year ago	935-42859 935 days ago	30-32706 30 days
7467	ADedecker author:ADedecker	feat: spectrum of X →ᵇ ℂ is StoneCech X	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	121/23	Mathlib/Analysis/NormedSpace/Star/BoundedContinuousFunction.lean,Mathlib/Analysis/NormedSpace/Star/GelfandDuality.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/ContinuousFunction/Compact.lean	4	1	['github-actions']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7512	Komyyy author:Komyyy	perf: override the data structures of coinductive types	The data structures of the model of coinductive types (`Stream'`, `Computation`, `Stream'.Seq`) are inefficient, so we override their data structures. --- - [x] depends on: #7514 - [ ] depends on: leanprover/lean4#2292 - [x] depends on: leanprover/std4#371 - [x] depends on: #8460 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-core-PR blocked-by-other-PR merge-conflict t-meta	6919/3700	Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantRecurrence.lean,Mathlib/Algebra/ContinuedFractions/EvalEquiv.lean,Mathlib/Algebra/ContinuedFractions/Real.lean,Mathlib/Algebra/ContinuedFractions/TerminatedStable.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Control/Fix.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Seq/WSeq.lean,Mathlib/Data/Stream.lean,lean-toolchain	22	2	['digama0', 'leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7564	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend strictly monotone function on `Ioo` to homeomorphism on `Icc`	A strictly monotone function between open intervals can be extended to a homeomorphism between the closed intervals. --- - [ ] depends on: #7351 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	162/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	954-61263 954 days ago	0-537 8 minutes
7601	digama0 author:digama0	feat: ring hom support in `ring`	As [requested on Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/aroots/near/395750055). Adds support for distributing ring morphisms in `ring`: ```lean example (p : ℤ[X]) (r : ℤ) : C (2 * r) * p = C r * p + C r * p := by ring ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-meta label:t-algebra$	257/48	Mathlib/Tactic/Ring/Basic.lean,test/linear_combination.lean,test/ring.lean	3	1	['eric-wieser']	nobody	656-74031 1 year ago	889-57634 889 days ago	62-28836 62 days
7615	eric-wieser author:eric-wieser	chore(LinearAlgebra/Basic): generalize compatibleMaps to semilinear maps	Spotted while reviewing #7611 --- - [x] depends on: #7611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra easy awaiting-CI label:t-algebra$	9/33	Mathlib/LinearAlgebra/Basic.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	951-22339 951 days ago	0-1 1 second
7713	RemyDegenne author:RemyDegenne	feat: add_left/right_inj for measures	`μ + ν₁ = μ + ν₂ ↔ ν₁ = ν₂`, and similarly on the right. This is not true in general for measures, but is true when `μ` is mutually singular with the two other measures or when `μ` is finite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	53/1	Mathlib/MeasureTheory/Measure/MutuallySingular.lean,lean-toolchain	2	6	['RemyDegenne', 'digama0', 'eric-wieser', 'fpvandoorn']	nobody	656-74031 1 year ago	944-68169 944 days ago	0-62955 17 hours
7835	shuxuezhuyi author:shuxuezhuyi	feat(LinearAlgebra/Matrix): `lift` for projective special linear group	We provide converters to help with the use of "quotient.liftOn" on projective special linear groups. --- - [x] depends on: #7826 - [x] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	52/0	Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	1	3	['jcommelin', 'leanprover-community-mathlib4-bot', 'shuxuezhuyi']	jcommelin assignee:jcommelin	656-74031 1 year ago	802-83862 802 days ago	1-85797 1 day
7875	astrainfinita author:astrainfinita	chore: make `SMulCommClass A A B` and `SMulCommClass A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	54/48	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/Ring.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/ContinuousFunction/ContinuousMapZero.lean,Mathlib/Topology/ContinuousFunction/StoneWeierstrass.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	27	15	['Parcly-Taxel', 'astrainfinita', 'jcommelin', 'leanprover-bot']	nobody	656-74031 1 year ago	711-4139 711 days ago	1-47913 1 day
7932	eric-wieser author:eric-wieser	refactor(Algebra/TrivSqZeroExt): replace with a structure	This is dogfooding my claim that "one-field structures are the lesser evil in Lean 4". This runs into the `simp [(stupid_parens)]` bug; or rather, a particular nasty instance of it where the offending simp call is inside `@[simps]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	155/73	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Logic/Equiv/TransferInstance.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean	4	1	['github-actions']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7962	eric-wieser author:eric-wieser	feat: `DualNumber (Quaternion R)` as a `CliffordAlgebra`	This provides a clifford algebra isomorphic to the dual quaternions --- - [x] depends on: #7934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	307/7	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Equivs.lean	3	16	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
8364	thorimur author:thorimur	feat: `refine?`	This PR adds `refine? e`, which suggests replacing unsynthesized `_`'s in `e` with `?_` in order to make `refine e'` work: ```lean example : Nat → Nat := by refine? fun (_ : _) => _ -- Try this: refine fun (_ : _) => ?_ ``` Note that this only suggests replacements for `_`'s present in the syntax; to create goals for implicit or instance arguments, the user is expected to use `refine'`. --- I'm especially open to suggestions on the filename (currently `RefineFix`). I'm also curious if this behaves as expected! Feel free to try it out "in real life" and comment here on edge cases. - [ ] depends on: #8503 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	684/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Tactic.lean,Mathlib/Tactic/RefineFix.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean,test/RefineFix.lean	9	5	['j-loreaux', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	656-74031 1 year ago	912-7765 912 days ago	6-59892 6 days
3575	Kha author:Kha	perf: selectively enable precompilation	--- This is an initial performance test on Linux. TODO: - [ ] test on macOS and Windows as well - [ ] adapt caching	merge-conflict WIP	3/0	lakefile.lean	1	21	['Kha', 'kim-em', 'leanprover-bot', 'tydeu']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
4771	thorimur author:thorimur	feat: Backtrack minimize	Utilities for backtracking in order to attain a minimum according to some arbitrary notion of size when generating lists of parts and alternatives in alternating fashion. Motivated by minimizing the number of generated subgoals under apply-like actions on the goal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	482/1	Mathlib/Tactic/Backtracking.lean,test/Backtracking.lean	2	0	[]	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
4775	thorimur author:thorimur	feat: `SubExpr` utilities	This file contains utilities for handling positions in expressions, including folding over subexpressions along with their positions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	148/0	Mathlib.lean,Mathlib/Lean/SubExpr.lean	2	0	[]	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
4785	thorimur author:thorimur	feat: ExprWithLevels	This introduces `ExprWithLevels`, a means of emulating universe polymorphism for non-constants during metaprogramming. [Description pending] - [ ] depends on: #4786 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	491/1	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Lean/Meta/ExprWithLevels.lean	4	1	['kim-em']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
4871	j-loreaux author:j-loreaux	feat: define the additive submonoid of positive elements in a star ordered ring	This file defines the `AddSubmonoid` of nonegative elements `StarOrderedRing.positive R` in a star ordered ring `R` with carrier `{ x : R \| 0 ≤ x }` (in fact, the definition only requires `OrderedAddCommMonoid R` to allow for other use cases, but it is primarily intended for `StarOrderedRing R`). Equivalently, this is the `AddSubmonoid` generated by the elements of the form `star s * s`. Even though this technically corresponds to the nonnegative elements, the "positive" terminology is standard throughout the literature (at least in C⋆-algebra theory and operator theory), so we choose to prefer that. The advantage of using this over other definitions of positivity is that it allows us to unify several different concepts under a single umbrella. For example, one might be tempted to consider the collection of bounded linear operators on an Hilbert space and define positivity as `∀ x, 0 ≤ ⟪T x, x⟫`, but this doesn't generalize nicely to C⋆-algebras. Alternatively, one could define positivity as those self-adjoint elements with nonnegative spectrum, but this requires the algebra to be unital. Our definition herein conveniently sidesteps these issues. --- Note: I declared the `AddMonoidWithOne` and `AddGroupWithOne` instances for `selfAdjoint R` separately because it made the proof of the latter easier. - [x] depends on: #6229 - [x] depends on: #10209 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	216/12	Mathlib.lean,Mathlib/Algebra/Order/Ring/CharZero.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Positive.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	6	28	['eric-wieser', 'j-loreaux', 'leanprover-community-mathlib4-bot']	nobody	656-74030 1 year ago	1069-60082 1069 days ago	5-55287 5 days
5133	kmill author:kmill	feat: IntermediateField adjoin syntax for sets of elements	Adds support for both `F⟮S⟯` and `F⟮α⟯`. The term `x` in `F⟮x⟯` is elaborated, and if it has type `Set _` the first interpretation is used, and otherwise the second is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	656-74030 1 year ago	1067-75156 1067 days ago	0-20 20 seconds
5912	ADedecker author:ADedecker	feat(Analysis.Distribution.ContDiffMapSupportedIn): space of smooth maps with support in a fixed compact	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	513/13	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	8	0	[]	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6002	slerpyyy author:slerpyyy	feat(Analysis.SpecialFunctions.Gaussian): add `integrable_fun_mul_exp_neg_mul_sq`	If `f : ℝ → ℝ` is bounded by a polynomial, `fun x : ℝ => f x * exp (-b * x ^ 2)` is integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	26/0	Mathlib/Analysis/SpecialFunctions/Gaussian.lean	1	3	['ocfnash', 'slerpyyy', 'urkud']	nobody	656-74030 1 year ago	1024-74392 1024 days ago	9-71263 9 days
6195	eric-wieser author:eric-wieser	chore(RingTheory/TensorProduct): golf the `mul` definition	--- - [x] depends on: #6211 - [x] depends on: #6187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Strangely this causes a timeout downstream	merge-conflict t-algebra awaiting-CI label:t-algebra$	4/29	Mathlib/RingTheory/TensorProduct.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6307	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add whiskering operators	We introduce whiskering operators. This allows us to introduce a simp-normal form for morphisms in monoidal categories. Rewriting into simp-normal forms is especially useful when combined with the coherence tactic. --- - [x] depends on: #6420 - [x] depends on: #8191 - [x] depends on: #9988 - [x] depends on: #9991 - [x] depends on: #9995 - [x] depends on: #10061 - [x] depends on: #10078 - [x] depends on: #10898 - [x] depends on: #10912 - [x] depends on: #11223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	325/280	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,test/CategoryTheory/Coherence.lean	15	38	['eric-wieser', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'leanprover-community-mathlib4-bot', 'yuma-mizuno']	nobody	656-74030 1 year ago	795-40304 795 days ago	60-84345 60 days
6328	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` lower priority	Many similar instances have been marked as lower priority. I'd like to see if this would make things faster. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-CI label:t-algebra$	14/14	Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	3	1	['digama0']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6330	astrainfinita author:astrainfinita	chore: make some instance about `Sub...Class` higher priority than `Sub...`	The opposite direction to #6328. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra slow-typeclass-synthesis label:t-algebra$	123/128	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/Subfield.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Subring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	11	13	['astrainfinita', 'digama0', 'leanprover-bot']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6403	astrainfinita author:astrainfinita	chore: change instance priorities of `Ordered*` hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order merge-conflict slow-typeclass-synthesis awaiting-author label:t-algebra$	253/79	Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/RingTheory/HahnSeries.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	18	39	['Vierkantor', 'astrainfinita', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	656-74030 1 year ago	901-26772 901 days ago	13-18399 13 days
6491	eric-wieser author:eric-wieser	chore(Mathlib/Algebra/Hom/GroupAction): add `SMulHomClass.comp_smul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	656-74030 1 year ago	928-60030 928 days ago	83-76369 83 days
7076	grunweg author:grunweg	feat: define measure zero subsets of a manifold	A topological manifold has no canonical measure, but there is a canonical notion of measure zero subsets. We show that these are closed under subsets and countable unions (hence define a filter, the almost everywhere filter) and that a closed nowhere dense has empty interior. This is necessary for stating the general version of Sard's theorem (in finite dimensions), and a first step towards its proof. This code was written at LftCM 2023. Thanks for @fpvandoorn for mentoring me! :heart: --- Unresolved questions/looking for feedback - Is "measure zero" a good name or would "null set" be better? I tend towards the former, but welcome input from a measure theorist (which I'm not). - What is the correct definition? One could also define "measure zero" using any `IsOpenPosMeasure` on the charted space. I think all results in this file still hold then, but for applications (e.g., Sard's theorem), this might be too general. - define custom notation, similar to the a.e. filter on a measure space? (We could include $J$ instead of $\mu$.) - what's the right syntax for formulas in docstrings --- use LaTeX or backticks? I don't know how to preview the generated docs, the guidelines are a bit ambiguous for me.	merge-conflict WIP t-differential-geometry t-measure-probability	165/0	Mathlib.lean,Mathlib/Geometry/Manifold/MeasureZero.lean,docs/references.bib	3	27	['ADedecker', 'github-actions', 'grunweg', 'mo271', 'sgouezel']	ADedecker assignee:ADedecker	656-74030 1 year ago	811-71339 811 days ago	43-56110 43 days
3757	thorimur author:thorimur	feat: config options for `fail_if_no_progress`	This PR creates config options for `fail_if_no_progress` that allow the user to tweak what exactly counts as "progress". This includes whether to use defeq or `BEq`, what transparency to use, and which parts of the goal and local context to check. It also splits off the comparison functionality into `Mathlib.Lean.Meta.Compare`, which provides fully configurable comparison functions for common complex metaprogramming types not specific to `fail_if_no_progress`. These types are `Expr`, `LocalDecl`, `LocalContext`, `MetavarDecl`, `MVarId`, and `List MVarId`. --- See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/progress.20on.20fail_if_no_progress) for a couple review questions. Status update: this PR is now basically done, save for some extra tests which should probably be included. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	603/54	Mathlib.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Compare.lean,Mathlib/Tactic/FailIfNoProgress.lean,test/fail_if_no_progress.lean	5	38	['alexjbest', 'github-actions', 'joneugster', 'kim-em', 'thorimur']	nobody	656-74029 1 year ago	1113-38711 1113 days ago	0-15 15 seconds
12353	thorimur author:thorimur	feat: `conv%`	This PR introduces `conv% e => tac`, along with `simp%`, `norm_num%`, and `push_neg%`, which are defined in terms of `conv%`. It also introduces `conv%?` (and `simp%?`, `norm_num%?`, and `push_neg%?`) as shortcuts for `show_term ...`. This is a relatively straightforward refactor of code already present in the implementation of `#conv`, and otherwise relies entirely on simple macros. This PR also introduces some modifications to existing command syntax for `#conv`, `#simp`, and `#norm_num`: * The syntax for `#conv` was `#conv tac => e`; however, this is inconsistent with the tactic syntax, and so this has been flipped to `#conv e => tac`. Likewise, `conv%` uses the same (new) syntax `conv% e => tac`. * `#simp` and `#norm_num` separated their config and `only` syntax from the expression by an optional `=>` (for `#simp`) and an optional `:` (for `#norm_num`) (e.g. `#simp only [lem] => e`). These have both been replaced with an optional`on` (e.g. `#simp only [lem] on e`) which is also used for `simp%` and `norm_num%`. Although `#whnf` is implemented in terms of `#conv`, this PR doesn't introduce `whnf%` in the same way, as that's probably better off being implemented directly instead of through `conv`. --- WIP: needs tests. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	131/32	Mathlib/Tactic/Conv.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/PushNeg.lean,docs/Conv/Guide.lean	4	0	[]	nobody	652-50339 1 year ago	756-1981 756 days ago	0-17 17 seconds
13852	FR-vdash-bot author:FR-vdash-bot	perf: skip some typeclasses in TC search	--- - [ ] depends on: #7873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis blocked-by-other-PR	45/33	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Norm.lean	3	21	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	652-44019 1 year ago	unknown	0-0 0 seconds
7903	urkud author:urkud	feat: define `UnboundedSpace`	--- The new instances generate some timeouts, and I don't understand why. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-topology	111/59	Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Topology/Bornology/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean	6	1	['github-actions']	nobody	649-62008 1 year ago	unknown	0-0 0 seconds
15679	adomani author:adomani	test: refactor in CI	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	213/5	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/CategoryTheory/Bicategory/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/TestRefactor.lean,Refactor/Main.lean,lakefile.lean,lean-toolchain	21	1	['github-actions']	nobody	644-31184 1 year ago	646-40626 646 days ago	0-8 8 seconds
7565	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend homeomorphism of `Ioo` to `Icc`	We extend the homeomorphisms between open intervals to homeomorphisms between the closed intervals. --- - [ ] depends on: #7018 - [ ] depends on: #7351 - [ ] depends on: #7564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR t-order	389/5	Mathlib.lean,Mathlib/Data/Set/Intervals/Image.lean,Mathlib/Order/Directed.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean,Mathlib/Topology/Algebra/Order/IntermediateValue.lean	5	1	['leanprover-community-mathlib4-bot']	nobody	642-67684 1 year ago	954-48563 954 days ago	0-222 3 minutes
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	642-67575 1 year ago	768-76412 768 days ago	53-73442 53 days
9973	Ruben-VandeVelde author:Ruben-VandeVelde	feat: polynomials formed by lists	From https://github.com/leanprover-community/mathlib/pull/15476 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-data	311/0	Mathlib.lean,Mathlib/Data/Polynomial/OfList.lean	2	0	[]	nobody	642-67108 1 year ago	unknown	0-0 0 seconds
12926	joelriou author:joelriou	feat(CategoryTheory): the monoidal category structure induced by a monoidal functor	In this PR, given a monoidal functor `F : MonoidalFunctor C D`, we define a monoidal category structure on the category `InducedCategory D F.obj`, which has the "same" objects as `C`, but the morphisms between `X` and `Y` identify to `F.obj X ⟶ F.obj Y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	105/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Induced.lean	2	3	['eric-wieser', 'github-actions', 'joelriou']	nobody	642-65507 1 year ago	733-70712 733 days ago	0-10 10 seconds
12869	adomani author:adomani	feat: linter and script for `theorem` vs `lemma`	This PR contains a linter for flagging doc-string-less `theorem`s, as well as a bash script that, once the linter ran on Mathlib, automatically replaces every linter-offending `theorem` by `lemma`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	106/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ThmLemma.lean,scripts/thmLemma.sh	4	13	['adomani', 'github-actions', 'grunweg', 'joneugster']	nobody	642-52271 1 year ago	696-72766 696 days ago	38-16364 38 days
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	641-66423 1 year ago	672-27005 672 days ago	6-38745 6 days
14308	grhkm21 author:grhkm21	feat(Algebra/Category): Direct construction of colimits in algebraic categories	(Below I only write about colimits since that's what I'm familiar with after working on it the last few days, but maybe it's the same for other categorical constructions) Main feature: Construct colimits in `AddCommGrp`/`ModuleCat`/`FGModuleCat`(/...) directly as coequalizer (i.e. cokernel i.e. quotient) of two maps, allowing one to say $\coprod_j M_j \cong $ Currently, if you look at how colimits are constructed for [AddCommGrp](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L69-L92), you see this massive block of code of all relations generating the quotient relation, but that's kind of bad, you can't say anything concretely about it. Also as noted in the TODOs of a few files: ``` TODO: In fact, in `ModuleCat R` there is a much nicer model of colimits as quotients of finitely supported functions, and we really should implement this as well. ``` I wrote it down [here](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Braided.20left.20rigid.20categories.20are.20right.20rigid/near/447490672), and have formalised it* in a small file already [here](https://gist.github.com/grhkm21/5b2d938753c0ce0900d21c93a39e3b7d#file-addcommgrpcolimits-lean-L162-L163) (I also have a `ModuleCat` version, and proving existence of colimits in `FGModuleCat` from it). Usually I will try to merge the file into Mathlib directly (preferably in one sitting), but I have been trying for a while now and been struggling. One issue is I am struggling to understand universes, which I asked [here](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Universe.20constraints!/near/448049266) along with many other places. A more concrete issue is that - [ ] FGModuleCat (and `FullSubcategory` in general) requires morphism and objects to be on the same universe, whereas generally `Category.{v, u}` don't. So that seems to limit what I can express, and maybe I have to fix it first. Here are a few more TODOs just so I don't forget, probably done before the one above: - [ ] Generalise `cokernelIsoQuotient` to other categories. - [ ] Also prove `coproductIsoDirectSum` - [ ] Also prove coequalizer (f + h) (g + h) ~ coequalizer f g ~ cokernel (f - g) 0 - [ ] Fix typo `FGModuleCatCat` If anyone is familiar with universe stuff and can answer my many questions that'll be great too. I need help understanding just [these five lines](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L267-L271)	merge-conflict WIP t-algebra label:t-algebra$	10/3	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	2	1	['github-actions']	nobody	641-64292 1 year ago	687-12569 687 days ago	0-23 23 seconds
13010	ADedecker author:ADedecker	feat: relax universe constraint in stoneCechExtend	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	33/3	Mathlib/Topology/StoneCech.lean	1	2	['ADedecker', 'erdOne']	nobody	641-64089 1 year ago	unknown	0-0 0 seconds
12411	adomani author:adomani	feat: more linting of cdots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter	953/617	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/Category/GroupCat/Colimits.lean,Mathlib/Algebra/Homology/Exact.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/Normed/Group/Pointwise.lean,Mathlib/Analysis/NormedSpace/FiniteDimension.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Multiplier.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Category/Cat/Limit.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/CategoryTheory/Category/TwoP.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Galois/GaloisObjects.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monad/Coequalizer.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite.lean,Mathlib/CategoryTheory/Sites/InducedTopology.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/HalesJewett.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/Holor.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Pairing.lean,Mathlib/Data/Real/Cardinality.lean,Mathlib/Data/Real/Hyperreal.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/Data/Set/Card.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/FieldTheory/RatFunc.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/ModelTheory/Skolem.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/RingTheory/AdjoinRoot.lean	147	2	['adomani', 'leanprover-bot']	nobody	641-63952 1 year ago	unknown	0-0 0 seconds
12279	casavaca author:casavaca	WIP: feat: Holder's inequality n-ary	--- - [x] depends on #12291 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	129/0	Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	2	13	['github-actions']	nobody	641-63937 1 year ago	758-38642 758 days ago	0-50185 13 hours
12093	ADedecker author:ADedecker	feat: tweak the definition of semicontinuity to behave better in nonlinear orders	Summary of the changes: - change definitions to make [lowerSemicontinuous_iff_isClosed_preimage](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Semicontinuous.html#lowerSemicontinuous_iff_isClosed_preimage) true without assuming `LinearOrder`, so that semicontinuity corresponds to continuity for lower/upper order topology on the codomain. See discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Semicontinuity.20definition.20for.20non-linear.20orders/near/432898278) - add new `iff` lemmas for unfolding the definition - add `iff` lemmas with the old definition in the linearly ordered case - some basic lemmas need to be changed in an easy way - minimize assumptions for continuity => semicontinuity - prove the semicontinuity criterion for indicators using "preimage of Ici/Iic" instead of a direct proof, because the proof is more natural (especially because we have no `filter_upwards` for `Frequently`) - in the rest of the file (which is about linear orders anyway), we don't touch the statements and just rewrite to the old definition. Some of these could be generalized, but we keep that for a later PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology	274/130	Mathlib/Analysis/BoundedVariation.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Semicontinuous.lean	4	0	[]	nobody	641-63899 1 year ago	unknown	0-0 0 seconds
11520	thorimur author:thorimur	feat: `linting_rules` and deprecated syntax	--- Experimental. WIP. Might not be performance-viable. - [ ] depends on: #11519 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	1016/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Command/Linter/Deprecated.lean,Mathlib/Command/Linter/LintingRules.lean,Mathlib/Command/SyntaxRules.lean,Mathlib/Command/SyntaxRules/Attr.lean,Mathlib/Command/SyntaxRules/Elab.lean,Mathlib/Command/SyntaxRules/Header.lean,Mathlib/Command/SyntaxRules/Util.lean,Mathlib/Tactic/Common.lean,scripts/noshake.json	11	11	['leanprover-bot', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	641-63889 1 year ago	unknown	0-0 0 seconds
11519	thorimur author:thorimur	feat: `syntax_rules`	--- Experimental. WIP. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	485/0	Mathlib.lean,Mathlib/Command/SyntaxRules.lean,Mathlib/Command/SyntaxRules/Attr.lean,Mathlib/Command/SyntaxRules/Elab.lean,Mathlib/Command/SyntaxRules/Header.lean,Mathlib/Command/SyntaxRules/Util.lean,scripts/noshake.json	7	0	[]	nobody	641-63875 1 year ago	unknown	0-0 0 seconds
11393	mcdoll author:mcdoll	feat(Analysis/Distribution/SchwartzSpace): The Heine-Borel property	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	688/3	Mathlib.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	6	0	[]	nobody	641-63865 1 year ago	unknown	0-0 0 seconds
9444	erdOne author:erdOne	feat: Various instances regarding `𝓞 K`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-number-theory	27/0	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/IntegralClosure.lean	2	9	['erdOne', 'leanprover-bot', 'mattrobball', 'riccardobrasca', 'xroblot']	nobody	641-63784 1 year ago	863-63211 863 days ago	1-62292 1 day
8931	hmonroe author:hmonroe	feat(Computable): define P, NP, and NP-complete	Revised to focus on languages that are binary strings, given the issue of non-acceptable encodings of unspecified Types --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author	381/5	Mathlib.lean,Mathlib/Computability/Complexity copy.lean,Mathlib/Computability/Complexity.lean,Mathlib/Computability/Encoding.lean,Mathlib/Computability/TMComputable.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Computability/halting example.lean,docs/references.bib	8	3	['fpvandoorn', 'github-actions', 'hmonroe']	nobody	641-63749 1 year ago	797-73131 797 days ago	93-64275 93 days
10641	newell author:newell	feat(Topology/MetricSpace/WellSpaced): Define sets that are well-spaced.	Create a new file `Mathlib.Topology.MetricSpace.WellSpaced` that contains definitions of sets which are in some sense well-spaced. Some examples are Delone and Meyer sets, which find applications in Quasicrystals and Coding Theory, among others. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	1073/14	Mathlib.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/GMetric/Basic.lean,Mathlib/Topology/GMetric/GInfSep.lean,Mathlib/Topology/GMetric/WellSpaced.lean,Mathlib/Topology/GPseudoMetric/Basic.lean,Mathlib/Topology/MetricSpace/WellSpaced.lean	8	1	['edegeltje']	nobody	641-63717 1 year ago	unknown	0-0 0 seconds
10387	adomani author:adomani	feat(Tactic/ComputeDegree): add `polynomial` tactic	Introducing the `polynomial` tactic, summing up `compute_degree, monicity` and adding support for `leadingCoeff`. This is more of a proof of concept: if there is interest in this tactic, I can polish it up. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Compute.20roots.20of.20polynomials/near/420713624). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP RFC t-meta	24/0	Mathlib/Tactic/ComputeDegree.lean	1	0	[]	nobody	641-63571 1 year ago	685-46601 685 days ago	143-73801 143 days
9154	FR-vdash-bot author:FR-vdash-bot	feat: `npow` / `nsmul` / `Nat.cast`/ `zpow` / `zsmul` implemented using `Nat.binaryRec`	--- - [ ] depends on: https://github.com/leanprover/lean4/pull/3756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra blocked-by-other-PR label:t-algebra$	168/359	Mathlib/Algebra/Group/Defs.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/EvenOddRec.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Order/Basic.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Init/Data/Nat/Bitwise.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Nat.lean,lake-manifest.json,lakefile.lean,test/zmod.lean	25	7	['astrainfinita', 'eric-wieser', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	641-63362 1 year ago	unknown	0-0 0 seconds
6603	tydeu author:tydeu	feat: automatically try `cache get` before build	--- A quick proof-of-concept. With this, `lake build` will always try `cache get` before building mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP CI	29/0	lakefile.lean	1	3	['kim-em', 'tydeu']	nobody	641-63336 1 year ago	995-79859 995 days ago	11-2031 11 days
6058	apurvnakade author:apurvnakade	feat: duality theory for cone programs	This PR tracks the development of duality theory for cone programs. [Reference](https://ti.inf.ethz.ch/ew/courses/ApproxSDP09/notes/conelp.pdf) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #6059 - [ ] define direct sum of cones - [ ] weak duality - [ ] regular duality - [ ] slater condition - [ ] strong duality	merge-conflict WIP t-analysis	159/0	Mathlib.lean,Mathlib/Analysis/Convex/Cone/ConeLinearProgram.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	641-63281 1 year ago	1031-13789 1031 days ago	0-9 9 seconds
6449	ADedecker author:ADedecker	feat: functions with finite fibers	--- This has been discussed before on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/.E2.9C.94.20Cofinite.20maps.3F) and it came up again while working with @kkytola's student. As explained in the docstring, we could absolutely just use `Tendsto f cofinite cofinite` all the time, but (1) we lack some API for it (2) the API is nicer to setup if we have a separate def (e.g for dot notation) and (3) mentioning filters for such a simple concept is really not beginner-friendly. I'm not sure at all about the name. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	203/0	Mathlib.lean,Mathlib/Logic/Function/HasFiniteFibers.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Cofinite.lean	4	14	['ADedecker', 'YaelDillies', 'alexjbest', 'kkytola']	nobody	641-63275 1 year ago	1007-61329 1007 days ago	6-70040 6 days
8100	digama0 author:digama0	feat: add support for other types in norm_num	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	177/12	Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/NormNum/Structural.lean,test/norm_num.lean	7	4	['dwrensha']	nobody	641-63143 1 year ago	unknown	0-0 0 seconds
13163	erdOne author:erdOne	feat(.vscode/module-docstring.code-snippet): Prevent auto-complete from firing on `do`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	5/0	.vscode/module-docstring.code-snippets	1	5	['erdOne', 'grunweg', 'robertylewis', 'trivial1711']	nobody	641-61885 1 year ago	673-76077 673 days ago	50-78405 50 days
15585	FR-vdash-bot author:FR-vdash-bot	test make `HasQuotient.quotient'` reducible	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	8/1	Mathlib/Algebra/Quotient.lean,Mathlib/GroupTheory/Coset.lean	2	1	['github-actions']	nobody	640-9151 1 year ago	unknown	0-0 0 seconds
15586	astrainfinita author:astrainfinita	test make `HasQuotient` out put a `setoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	22/36	Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Quotient.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/Topology/Algebra/UniformRing.lean	14	5	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	640-9151 1 year ago	unknown	0-0 0 seconds
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability tech debt	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	638-30420 1 year ago	702-20006 702 days ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [x] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry t-category-theory	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg']	nobody	638-30279 1 year ago	766-47220 766 days ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	638-30178 1 year ago	724-40162 724 days ago	29-50022 29 days
9978	FR-vdash-bot author:FR-vdash-bot	chore(FieldTheory/KummerExtension): move some lemmas earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	197/177	Mathlib.lean,Mathlib/Data/Polynomial/FieldDivision.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Polynomial/Irreducible.lean	5	5	['alreadydone', 'grunweg', 'riccardobrasca']	nobody	638-29970 1 year ago	836-24152 836 days ago	8-83342 8 days
12429	adomani author:adomani	feat: toND -- auto-generating natDegree	This is an experiment to automatically translate theorems about `degree` to theorems about `natDegree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC merge-conflict awaiting-author t-meta label:t-algebra$	167/132	Mathlib.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Mirror.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ToNatDegree.lean,scripts/noshake.json	11	2	['adomani', 'grunweg']	nobody	638-29281 1 year ago	749-63354 749 days ago	3-76602 3 days
15823	eric-wieser author:eric-wieser	Quotients of rings in model theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-logic	55/13	Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/ModelTheory/Syntax.lean	2	1	['github-actions']	nobody	638-7844 1 year ago	unknown	0-0 0 seconds
12178	joneugster author:joneugster	feat(Data/Matrix/Basic): add notation for `m×n`-Matrices	Introduce the notation `Mat[m,n][R]` for `Matrix (Fin m) (Fin n) R`. [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Why.20does.20.60Matrix.2Erow.60.20use.20.20.60Unit.60.20instead.20of.20.60Fin.201.60.3F/near/427949223) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	139/135	Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Rank.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Determinant.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/RingTheory/SimpleModule.lean,test/matrix.lean	22	9	['YaelDillies', 'eric-wieser', 'grunweg', 'joneugster']	nobody	637-71368 1 year ago	756-61761 756 days ago	5-76679 5 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	637-51332 1 year ago	672-57554 672 days ago	56-40668 56 days
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	637-40385 1 year ago	647-147 647 days ago	7-18420 7 days
10350	Shamrock-Frost author:Shamrock-Frost	feat(Data/Setoid): add the operations of taking the equivalence class of an element and of saturating a set wrt an equivalence relation	I'm open to suggestions about changing the name "saturate", someone on zulip rightly pointed out this is a very overloaded term in math. That said, I think it's unlikely to cause confusion and that there's only one reasonable interpretation in the context of setoids. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	169/3	Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Order/Closure.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	635-53606 1 year ago	754-45234 754 days ago	19-74546 19 days
13573	Shamrock-Frost author:Shamrock-Frost	feat: add multivariate polynomial modules	Add a type synonym for multivariate polynomials with coefficients in a module. --- Multivariate polynomials with module coefficients are sort of silly, but they sometimes show up in commutative algebra (eg in the definition of a quasi regular sequence). Writing this code involved a lot of copy and pasting from `PolynomialModule` and `MvPolynomial`. The API is definitely lacking at this stage but it's a start. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	691/6	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Module/Basic.lean,Mathlib/Algebra/MvPolynomial/Module/MvAEval.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean	4	9	['Shamrock-Frost', 'erdOne', 'github-actions']	nobody	635-53586 1 year ago	671-45954 671 days ago	39-72752 39 days
6517	MohanadAhmed author:MohanadAhmed	feat: discrete Fourier transform of a finite sequence	# Discrete Fourier Transform (DFT) Matrix and DFT of a (finite) sequence This file defines the `dft` opertaion on a sequence (also a vecotr) and the DFT operation matrix ## Main definitions - `dft v`: given a sequence (v : (Fin n) → ℂ) we can transform it into a sequence (V : (Fin n) →ℂ) such that $$V [p] = ∑_{k = 0}^{N - 1} e^{-j2πkp/n} v [k]$$ - `idft V` : given a sequence (V : (Fin n) → ℂ) we can transform it into a sequence (v : (Fin n) → ℂ) such that $$v [k] = \frac{1}{N}∑_{p = 0}^{n - 1} e^{j2πkp/N} v [p]$$ - `dftMatrix n` : the dft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = e^{-j2πkp/n}$$ - `(dftMatrix n)⁻¹` : the idft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = (1/N) e^{j2πkp/n}$$ ## Main results - `dft v = (dftMatrix n) v` : the dft operation on a sequence is the same as the dft matrix applied to the vector - `idft V = (dftMatrix n)⁻¹ V` : the idft operation on a sequence is the same as the idft matrix applied to the vector - `dft (idft v) = dft ( idft v) = v` the dft and idft operations are inverses - `Wₙ = vandermonde (w)` : the dft matrix is vandermonde with `w` being the first row of the dft matrix - `circulant t = (dftMatrix n)⁻¹ ⬝ diagonal (dft t) ⬝ (dftMatrix n)` : a circulant matrix is diagonalizable by the dft and idft matrix pair. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	294/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/DFT.lean	2	26	['MohanadAhmed', 'ericrbg']	nobody	635-53424 1 year ago	944-77640 944 days ago	65-20427 65 days
13155	alreadydone author:alreadydone	feat(NumberTheory/EllipticDivisibilitySequence): show elliptic relations follow from even-odd recursion	This PR is centered around the (generalized) elliptic relations (`rel₄`) $E(a,b,c,d): W_{a+b}W_{a-b}W_{c+d}W_{c-d}=W_{a+c}W_{a-c}W_{b+d}W_{b-d}-W_{a+d}W_{a-d}W_{b+c}W_{b-c}$. For an integer-indexed sequence W valued in a commutative ring, the relation makes sense only when a,b,c,d are all integers or all half integers. For convenience of formalization, we instead consider integers a,b,c,d of the same parity and divide all subscripts by 2. We extract the subexpression $W_{(a+b)/2}W_{(a-b)/2}$ (which appear six times) as `addMulSub W a b`. The collection of all $E(a,b,c,d)$ is equivalent to Stange's axiom for elliptic nets (`net`), and the literature (e.g. Silverman) commonly consider only the three-index special case $E(m,n,r,0)$ (`Rel₃`). Important special cases of these relations are (i) $E(m+1,m,1,0): W_{2m+1}W_1^3=W_{m+2}W_m^3-W_{m+1}^3 W_{m-1}$ (`oddRec`) and (ii) $E(m+1,m-1,1,0): W_{2m}W_2 W_1^2=W_m(W_{m+2}W_{m-1}^2-W_{m-2}W_{m+1}^2)$ (`evenRec`), which suffice to uniquely specify $W$ on all positive integers recursively from four initial values $W_1, W_2, W_3, W_4$ (`IsEllSequence.ext`, if $W_1 W_2$ is not a zero divisor). In the usual setting where $W_1=1$ and $W_2\mid W_4$, there does exist a sequence (`normEDS`) satisfying (i) and (ii) given initial values $W_2, W_3$ and $W_4/W_2$. It turns out the same non-zerodivisor condition also guarantees that W is an odd function with $W_0=0$, which naturally extends W to all integers. The main result of this PR (`rel₄_of_oddRec_evenRec`, `IsEllSequence.of_oddRec_evenRec`) is a purely algebraic proof that the sequence W defined by the single-parameter elliptic relations (i) and (ii) implies all $E(a,b,c,d)$, based on my original argument first published on [Math.SE](https://math.stackexchange.com/a/4903422/12932). It's based on the observation that a nonzerodivisor-multiple of $E(a,b,c,d)$ can be expressed as a linear combination of various $E(a,b,c_\min,d_\min)$ with the two smallest indices fixed at their minimal possible values, which can be transformed (`transf`) to an elliptic relation with smaller `a` (which can be assumed to hold by induction), unless they are of the form (i) or (ii) which hold by assumption. For this argument it's necessary to assume `a > b > c > d ≥ 0` (see `StrictAnti₄` and `Rel₄OfValid`), but it's easy to extend to arbitrary a,b,c,d by symmetry properties of `rel₄` under negation and permutations of indices. In the subsequent PR #13057, we show all normalized EDSs (`normEDS`), defined using the even-odd recursion (i)-(ii), are elliptic (i.e. satisfy the elliptic relations) divisibility sequences. This PR doesn't directly apply because a normEDS doesn't always satisfy the nonzerodivisor condition, but they are specializations of the universal normEDS, which does satisfy the condition. The technique of reducing to the universal case will be applied many times, and relies on the naturality (`map`) lemmas. We also change the `ℕ` in the definition `IsDivSequence` to `ℤ` which is more natural given that W is a `ℤ`-indexed sequence. --- - [x] depends on: #13153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	565/12	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	55	['Multramate', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	629-67028 1 year ago	678-68915 678 days ago	26-39367 26 days
15600	adomani author:adomani	feat: lint also `let` vs `have`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter	77/26	Mathlib/Tactic/Linter/HaveLetLinter.lean,test/HaveLetLinter.lean	2	1	['github-actions']	nobody	628-35304 1 year ago	649-29002 649 days ago	0-8 8 seconds
16253	Shreyas4991 author:Shreyas4991	feat: Basics of Discrete Fair Division in Mathlib	This PR adds the basics of discrete fair division in mathlib. We include the definitions of allocations, valuations, properties of valuations, and the following notions : Envy-Freeness (EF), Envy-Freeness upto 1 good (EF1), and envy freeness upto any good (EFX). We also include the various implications between these notions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-author	144/0	Mathlib/GameTheory/FairDivision/Discrete/Basic.lean	1	9	['Shreyas4991', 'eric-wieser', 'github-actions']	nobody	627-33217 1 year ago	627-37478 627 days ago	0-20853 5 hours
13970	adomani author:adomani	feat: a linter to flag unnecessary uses of `nolint simpNF`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	230/0	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Even.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnnecessarySyntax.lean,test/UnnecessarySyntax.lean	13	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	626-58518 1 year ago	unknown	0-0 0 seconds
15162	adomani author:adomani	feat: checkAsSorry linter	A very preliminary version of the `checkAsSorry` linter. It flags declarations whose type is not equal to the 'asSorry'ed one. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Running.20Mathlib.20under.20.60set_option.20debug.2EbyAsSorry.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter	119/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CheckAsSorry.lean,test/CheckAsSorry.lean	4	1	['github-actions']	nobody	626-57506 1 year ago	unknown	0-0 0 seconds
14669	Command-Master author:Command-Master	feat(Data/Nat/PartENat): add lemmas for PartENat	Add some missing lemmas for `PartENat`, as well as the additive homomorphism from it to `WithTop Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor merge-conflict	90/0	Mathlib/Data/Nat/PartENat.lean	1	4	['erdOne', 'github-actions', 'mathlib-merge-conflicts', 'urkud']	nobody	624-63222 1 year ago	675-70744 675 days ago	0-6775 1 hour
15121	Eloitor author:Eloitor	feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-category-theory new-contributor	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	624-26167 1 year ago	655-71826 655 days ago	7-3203 7 days
15895	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability WIP	172/0	Mathlib/Computability/ContextFreeGrammar.lean	1	43	['YaelDillies', 'github-actions', 'madvorak']	nobody	623-42960 1 year ago	627-76469 627 days ago	1-43047 1 day
14038	adomani author:adomani	test/decl diff in lean dev	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	231/2	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,Mathlib/Tactic/Eval.lean,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	3	['github-actions']	nobody	622-51020 1 year ago	695-21139 695 days ago	0-8 8 seconds
14046	adomani author:adomani	test: diff of declarations in lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	231/2	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,Mathlib/Tactic/Eval.lean,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	2	['github-actions']	nobody	622-51020 1 year ago	unknown	0-0 0 seconds
12107	yuma-mizuno author:yuma-mizuno	feat(Mathlib/Tactic/Widget/StringDiagram): support 2-morphisms in bicategories	--- - [x] depends on: #11080 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory t-meta	1158/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/Widget/StringDiagram.lean,scripts/noshake.json,test/StringDiagram.lean,widget/src/penrose/monoidal.dsl,widget/src/penrose/monoidal.sty	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	617-45764 1 year ago	unknown	0-0 0 seconds
15925	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Monoida): proof producing coherence tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory t-meta	5018/265	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Braided.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/BicategoricalComp.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean,Mathlib/Tactic/CategoryTheory/Coherence/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/CoherenceNew.lean,Mathlib/Tactic/CategoryTheory/Monoidal.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Basic.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,Mathlib/Tactic/Widget/StringDiagram.lean,lake-manifest.json,scripts/noshake.json,test/CategoryTheory/Bicategory.lean,test/CategoryTheory/Coherence.lean,test/CategoryTheory/CoherenceNew.lean,test/CategoryTheory/Monoidal.lean,test/CategoryTheory/Monoidal/Basic.lean,test/CategoryTheory/Monoidal/Normalize.lean,test/CategoryTheory/MonoidalComp.lean,test/StringDiagram.lean	35	1	['github-actions']	nobody	617-5901 1 year ago	unknown	0-0 0 seconds
7861	shuxuezhuyi author:shuxuezhuyi	feat(Geometry/Hyperbolic/UpperHalfPlane): instance IsometricSMul PSL(2, ℝ) ℍ	--- - [ ] depends on: #7835 - [ ] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-euclidean-geometry	98/0	Mathlib.lean,Mathlib/Geometry/Hyperbolic/UpperHalfPlane/Basic.lean,Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	616-73361 1 year ago	677-27489 677 days ago	43-50453 43 days
16570	yuma-mizuno author:yuma-mizuno	chore(Tactic/CategoryTheory): change `TermElabM` to `MetaM`	Separated from #15335. To use `Qq`, we need to modify `Qq` to support universe matching. See [Zulip](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2315335.20meta.20code.20for.20monoidal.20categories). --- - [ ] depends on: #15335 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	26/15	Mathlib/Tactic/CategoryTheory/BicategoryCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	616-49826 1 year ago	unknown	0-0 0 seconds
6475	joneugster author:joneugster	refactor(LinearAlgebra/Span): replace ∙ with • as notation for `span R {x}`	Change the notation for `Submodule.span R {x}` from `R ∙ x` to the bullet `R • x`, which is also used for scalar multiplication. --- (this was an experiment originating from a [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/.2E.C2.B7.E2.AC.9D.20.5Brant.5D), I don't have a clear opinion if this is actually a desired thing to do...) Generally this works and Lean seems to do fine figuring out the difference between `r • x` and `R • x` (The former is scalar multiplication in an `R`-module `M`, the latter is the `Submodule R M` generated by `x`). Encountered a few regressions that should be considered (the first two might be also bugs that could be looked at independently): 1. `(· • ·)`, and general simple function syntax, does not work as notation for `HSMul.hSMul` anymore. For this reason, I introduced the notation `scoped` to minimise the effect of this. Now it's only a problem if you `open Span`. Note that `fun x₁ x₂ ↦ x₁ • x₂` works flawlessly all the time. 4. `change` and `convert` have troubles to deal with the two competing notations. `have := _; convert this` works. 5. `R • x - y` is not valid anymore and needs parentheses: `R • (x - y)`. I do think this actually helps readability, so I don't mind. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra RFC label:t-algebra$	323/240	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Normalizer.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/NormedSpace/ContinuousLinearMap.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Data/ZMod/Quotient.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/BilinearForm.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Dimension.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/ProjectiveSpace/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/MeasureTheory/Integral/Periodic.lean,Mathlib/RingTheory/Coprime/Ideal.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/Ideal/AssociatedPrime.lean,Mathlib/RingTheory/Ideal/IdempotentFG.lean,Mathlib/RingTheory/Noetherian.lean,Mathlib/Topology/Instances/AddCircle.lean	42	3	['eric-wieser', 'joneugster', 'leanprover-bot']	nobody	615-70657 1 year ago	unknown	0-0 0 seconds
10591	adri326 author:adri326	feat(Topology/Algebra/ConstMulAction): properties of continuous actions in Hausdorff spaces	Defines some useful properties of `ContinuousConstSMul` group actions on Hausdorff spaces: - `MulAction.isClosed_fixedBy`, which proves that the `fixedBy α m` set is closed - `t2_separation_smul`, which constructs an open set `s` such that `s` and `g • s` are disjoint - `Set.InjOn.t2_separation_smul`, the extension of `t2_separation_smul` to a set of group elements whose action is injective --- This PR belongs my series of PR around the formalization of Rubin's theorem. `MulAction.isClosed_fixedBy` is used in several places along the proof, and the separation lemmas are primarily used in showing that `(fixedBy α g)ᶜ` and `(fixedBy α h)ᶜ` are disjoint under some intricate but fully group-theoretic condition. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author t-algebra label:t-algebra$	57/0	Mathlib/Topology/Algebra/ConstMulAction.lean	1	9	['ADedecker', 'adri326', 'j-loreaux', 'jcommelin']	ADedecker assignee:ADedecker	615-41818 1 year ago	767-54560 767 days ago	55-82204 55 days
7545	shuxuezhuyi author:shuxuezhuyi	feat: APIs of `Function.extend f g e'` when `f` is injective	We characterizes `range g`, `Injective g`, `Surjective g` and `Bijective g` in terms of `extend f g e'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	50/0	Mathlib.lean,Mathlib/Logic/Function/ApiForExtend.lean	2	1	['fpvandoorn']	nobody	614-86193 1 year ago	923-33975 923 days ago	32-32325 32 days
16658	adomani author:adomani	add tips file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author test-ci	51/508	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/Tips.lean	5	1	['github-actions']	nobody	611-28726 1 year ago	unknown	0-0 0 seconds
14078	Ruben-VandeVelde author:Ruben-VandeVelde	feat(CI): continue after mk_all fails	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	43/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Data/Nat/Test.lean	5	2	['bryangingechen', 'github-actions']	nobody	611-9026 1 year ago	693-61986 693 days ago	0-13311 3 hours
11283	hmonroe author:hmonroe	feat(ModelTheory/Satisfiability): define theory with independent sentence	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-logic	8/0	Mathlib/ModelTheory/Satisfiability.lean	1	2	['fpvandoorn', 'hmonroe']	nobody	608-65980 1 year ago	795-39650 795 days ago	3-63452 3 days
16914	siddhartha-gadgil author:siddhartha-gadgil	Loogle syntax with non-reserved	This is PR mainly to test that loogle syntax does not break stuff downstream --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/4	lake-manifest.json,lakefile.lean	2	1	['github-actions']	nobody	606-54589 1 year ago	607-51678 607 days ago	0-14835 4 hours
13782	alreadydone author:alreadydone	feat(EllipticCurve): ZSMul formula in terms of division polynomials	The formula $[n]P = (\phi_n(x,y) : \omega_n(x,y) : \psi_n(x,y))$ in Jacobian coordinates for $P=(x,y)$ a nonsingular point on a Weierstrass/elliptic curve. --- - [x] depends on: #12883 - [x] depends on: #13399 - [ ] depends on: #13057 - [ ] depends on: #13155 - [x] depends on: #13845 - [x] depends on: #13846 - [ ] depends on: #13847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory blocked-by-other-PR merge-conflict t-algebraic-geometry label:t-algebra$	2462/232	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/ZSMul.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	10	8	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	604-17554 1 year ago	unknown	0-0 0 seconds
8118	iwilare author:iwilare	feat(CategoryTheory): add dinatural transformations	A starting point to define [dinatural transformations](https://ncatlab.org/nlab/show/dinatural+transformation). This is my first PR so style comments and improvements are very welcome! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	147/7	Mathlib.lean,Mathlib/CategoryTheory/DinatTrans.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Products/Bifunctor.lean	4	49	['Shamrock-Frost', 'github-actions', 'iwilare', 'joelriou']	Shamrock-Frost assignee:Shamrock-Frost	601-76875 1 year ago	705-57352 705 days ago	21-30729 21 days
14242	js2357 author:js2357	feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr`	Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`. Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib. - [x] depends on: #14099 - [x] depends on: #14216 - [ ] depends on: #14237 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	269/1	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	601-37226 1 year ago	689-26173 689 days ago	0-273 4 minutes
17171	FR-vdash-bot author:FR-vdash-bot	test extends carrier and property	--- We need https://github.com/leanprover/lean4/issues/2666 ... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	433/309	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/Field/Subfield.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/MulOpposite.lean,Mathlib/Algebra/Ring/Subsemiring/Order.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Star/Subsemiring.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Deprecated/Subfield.lean,Mathlib/Deprecated/Subgroup.lean,Mathlib/Deprecated/Submonoid.lean,Mathlib/Deprecated/Subring.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/DoubleCoset.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/SetTheory/Cardinal/Subfield.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean	42	1	['github-actions']	nobody	597-35568 1 year ago	unknown	0-0 0 seconds
7516	ADedecker author:ADedecker	perf: use `abbrev` to prevent unifying useless data	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/3	Mathlib/Topology/ContinuousFunction/Bounded.lean	1	3	['ADedecker', 'leanprover-bot', 'mattrobball']	nobody	596-7228 1 year ago	956-57845 956 days ago	0-16 16 seconds
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	137/2	Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Set/Finite.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Quotients.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/Action/Concrete.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/State.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/SetTheory/Surreal/Multiplication.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/UniformSpace/Separation.lean,test/interactiveUnfold.lean	68	1	['github-actions']	nobody	596-2271 1 year ago	596-2271 596 days ago	4-72805 4 days
16887	metinersin author:metinersin	feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas	Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`. --- - [ ] depends on: #16885 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61278 608 days ago	0-1299 21 minutes
16888	metinersin author:metinersin	feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms	Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`. --- - [ ] depends on: #16887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61279 608 days ago	0-1045 17 minutes
16889	metinersin author:metinersin	feat(ModelTheory/Complexity): Normal forms	Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively. --- - [ ] depends on: #16888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33203 1 year ago	608-57029 608 days ago	0-613 10 minutes
5995	FR-vdash-bot author:FR-vdash-bot	feat: add APIs about `Quotient.choice`	Some docs in this PR refer to the definition in #5576. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author RFC t-data	76/6	Mathlib/Data/Quot.lean	1	3	['YaelDillies', 'astrainfinita', 'gebner']	eric-wieser assignee:eric-wieser	586-47413 1 year ago	711-68074 711 days ago	285-35716 285 days
14619	Command-Master author:Command-Master	chore: Merge `Trunc` to `Squash`	Remove `Trunc` and use `Squash` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP new-contributor	197/211	Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Semiquot.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/List.lean	13	3	['Command-Master', 'github-actions', 'vihdzp']	nobody	583-79754 1 year ago	unknown	0-0 0 seconds
13156	erdOne author:erdOne	refactor(Algebra/Module/LocalizedModule): Redefine `LocalizedModule` in terms of `OreLocalization`.	--- - [x] depends on: #13151 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	519/628	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	8	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	581-54553 1 year ago	581-54553 581 days ago	51-84473 51 days
16348	urkud author:urkud	refactor(Topology): require `LinearOrder` with `OrderTopology`	While the definition formally makes sense for a preorder, this topology is usually not the right one for a non-linear order (e.g., `Real × Real`). See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Open.20Ioi) --- This PR doesn't cleanup any API, I'm going to do it in a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	33/46	Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/Sign.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Filter.lean,Mathlib/Topology/Order/MonotoneContinuity.lean	6	10	['YaelDillies', 'github-actions', 'jcommelin', 'urkud']	nobody	581-54177 1 year ago	622-111 622 days ago	3-83049 3 days
13965	pechersky author:pechersky	feat(Data/DigitExpansion): reals via digit expansion are complete	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #13964	merge-conflict blocked-by-other-PR t-data	3876/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Add.lean,Mathlib/Data/DigitExpansion/Defs.lean,Mathlib/Data/DigitExpansion/Hensel.lean,Mathlib/Data/DigitExpansion/Integer/Basic.lean,Mathlib/Data/DigitExpansion/Integer/Mul.lean,Mathlib/Data/DigitExpansion/Real/Basic.lean,Mathlib/Data/DigitExpansion/Real/CompleteSpace.lean,Mathlib/Data/DigitExpansion/Real/ConditionallyComplete.lean,docs/references.bib	10	4	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	580-4945 1 year ago	698-37564 698 days ago	0-600 10 minutes
16984	hrmacbeth author:hrmacbeth	feat: extend `module` tactic to handle multiple rings, not strictly ordered by inclusion	The `module` tactic currently in Mathlib handles scalars from multiple rings, but only if for any two rings `R` and `S` which appear, either `R` is an algebra over `S` or vice versa. This PR extends the tactic by providing a syntax `module T`, which will handle scalars from any ring `R` which `T` is an algebra over. For example, ```lean example : (2:ℤ) • x = (2:ℚ≥0) • x := by module ``` fails since `ℤ` is not a `ℚ≥0`-algebra and `ℚ≥0` is not a `ℤ`-algebra, but ```lean example : (2:ℤ) • x = (2:ℚ≥0) • x := by module ℚ ``` works since `ℚ` is both a `ℤ`-algebra and a `ℚ≥0`-algebra. This PR is a quick proof-of-concept implementation, just to record the desired approach and tactic syntax. It should not be merged as-is. It has with a lot of code duplication and should be rewritten more efficiently (for example, `parse` and `parseEnsuringType` should be merged to a single function, and the `some`/`none` cases in `matchScalarsAux` should be merged to a uniform treatment) before being considered for merging to Mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	158/35	Mathlib/Tactic/Module.lean,test/module.lean	2	1	['github-actions']	nobody	577-76617 1 year ago	unknown	0-0 0 seconds
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-data new-contributor merge-conflict awaiting-author	226/0	Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean	5	5	['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	575-55861 1 year ago	724-37959 724 days ago	16-49744 16 days
12414	adomani author:adomani	test: lint and unlint `·`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	64/14	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Tactic/Linter/Multigoal.lean,test/Multigoal.lean	4	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	573-52402 1 year ago	unknown	0-0 0 seconds
16647	eric-wieser author:eric-wieser	feat: partitions of lists	The length of this list is the bell numbers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics t-data	311/0	Mathlib.lean,Mathlib/Data/List/Partition.lean	2	1	['github-actions']	nobody	570-72876 1 year ago	unknown	0-0 0 seconds
13514	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): closure under union	- [ ] depends on: #15895 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	562-67189 1 year ago	640-41170 640 days ago	72-28417 72 days
5364	thorimur author:thorimur	feat: `wlog ... replacing`	This allows hypotheses to be removed from the set of generalized hypotheses. E.g. `wlog h : P replacing h'` will remove `h'` from the hypotheses of the type of `this` and from the context of the goal that will suppose `h`. See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/wlog.20.2E.2E.2E.20replacing.20.2E.2E.2E.3F). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	125/18	Mathlib/Tactic/WLOG.lean,test/wlog.lean	2	2	['thorimur', 'urkud']	nobody	561-13828 1 year ago	unknown	0-0 0 seconds
9654	urkud author:urkud	feat: add `@[mk_eq]` version of `@[mk_iff]`	The new attribute generates theorems like ```lean List.chain_eq : @List.Chain = fun {α} R a a_1 => a_1 = [] ∨ ∃ b l, R a b ∧ List.Chain R b l ∧ a_1 = b :: l ``` and is useful to rewrite in a theorem that argues about the properties of an unapplied inductive predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	63/9	Mathlib/Lean/Meta.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean,test/MkIffOfInductive.lean	3	6	['Vierkantor', 'github-actions', 'urkud']	nobody	561-13582 1 year ago	832-63281 832 days ago	25-70825 25 days
16704	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.Data.Ordering.Dickson): Dickson orders	Dickson orders are a particular class of well founded orders characterized by the fact that every nonempty set has finitely many minimal elements. They appear in the classical theory of Groebner bases because it is easier to prove that some sets are well founded using this property. WiP. In the `tfae` function, property 2 is exactly `Set.PartiallyWellOrderedOn`, so the PR should be rewritten so as to use that property (and not define `IsDickson`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	324/0	Mathlib.lean,Mathlib/Data/Ordering/Dickson.lean,scripts/noshake.json	3	9	['AntoineChambert-Loir', 'b-mehta', 'github-actions']	nobody	560-78539 1 year ago	611-67370 611 days ago	2-84515 2 days
16355	Ruben-VandeVelde author:Ruben-VandeVelde	feat: odd_{add,sub}_one	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	12/0	Mathlib/Algebra/Ring/Int.lean,Mathlib/Algebra/Ring/Parity.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'urkud']	nobody	560-26336 1 year ago	625-14782 625 days ago	0-57608 16 hours
8638	alreadydone author:alreadydone	refactor: noncommutative tensor product	Co-authored-by: Eric Wieser Co-authored-by: Jujian Zhang This draft PR currently only generalizes a single file TensorProduct.lean; it allows TensorProduct to be taken over a non-commutative ring. Most of the declarations in TensorProduct.lean are now generalized to the non-commutative setting, and very few are deleted (their commutative version will be restored in another file). Next plans: + Change the namespace in TensorProduct.lean from TensorProduct to NonCommTensorProduct, and remove the #aligns + I plan to use the same notation for the non-commutative and the commutative TensorProduct, and the user will need to `open scoped` different namespaces to use the one of their choice. + Start a new file TensorProduct/Comm.lean, copy the content of TensorProduct.lean on master into it, change the definition TensorProduct to be semi-reducibly defeq to NonCommTensorProduct (in order to support more instances or unify non-defeq instances that become prop-eq in the commutative setting, e.g. we've chosen the R-action on a tensor product over commutative R to come from the left factor, since the action from the right factor is the same), and reuse the NonComm constructions as much as possible. We then change all files that imports TensorProduct.lean to import TensorProduct/Comm.lean instead. Once we do that, mathlib would compile and this PR would be complete. We can gradually generalize other files about tensor products this way. In this PR: `TensorProduct.map` is now defined in terms of `lTensor` and `rTensor` rather than the other way around, which requires moving `lTensor` and `rTensor` up from their original location. The definition of `rid` also becomes more challenging and is moved down. An evident observation is that actions on the domain of AddMonoidHom / LinearMap is really natural in the context of tensor products and Hom-tensor adjunction (`TensorProduct.lift`), not the default actions on the codomain. For example, it allows us to write the "balanced biadditive monoid homs" in #8536 as simply `N →ₗ[R] M →+ P` (where the right R-action on M turns into the left action on `M →+ P`). For this reason, we disable the default instances `AddMonoidHom/LinearMap.module` at the beginning of the file and enable the `AddMonoidHom/LinearMap.domModule` instances instead. (The action on the codomain would be necessary for the non-commutative version of [TensorProduct.lTensorHomToHomLTensor](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/TensorProduct.html#TensorProduct.lTensorHomToHomLTensor) (in the form of `P ⊗[R] (M →+ Q) →+ M →+ P ⊗[R] Q`), but I've deleted it for now.) We register actions on the left factor of a tensor product as the default instance, but we also talk about actions on the right factor (`attribute [local instance] rightModule`). The Tensor-Hom adjunction #8495 is now `uncurryEquiv` in this PR. #8519 is now included in this PR and #8584 is now called `lift` in this PR. `CharacterModule.homEquiv` in #8559 can be obtained by combining `liftEquiv` and `flipMop` in this PR (except for a mop). To refactor the commutative tensor product, we'd need to transfer many R^mop-action to R-action and R^mop-LinearMaps to R-LinearMaps, which can be achieved via `Module.compHom` and `LinearMap.restrictScalars` (requires `LinearMap.CompatibleSMul` instance) given `RingEquiv.toOpposite`. `LinearMap.characterfy` and `CharacterModule.cong` could be obtained from `LinearMap.compAddMonoidHom` in this PR. TODO: + Move delarations that belong to other files. + Change docstrings that are no longer accurate. + Fix some argument order to be more natural. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	793/676	Mathlib/Algebra/Module/LinearMap.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct.lean	3	6	['alreadydone', 'eric-wieser', 'grhkm21', 'jjaassoonn']	nobody	559-52549 1 year ago	unknown	0-0 0 seconds
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-order new-contributor label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	558-84137 1 year ago	558-84137 558 days ago	7-45599 7 days
18636	adomani author:adomani	Test/latest import report dev	This PR is a test accompanying #18631. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	147/0	.github/workflows/latest_import.yml,lakefile.lean	2	1	['github-actions']	nobody	557-71408 1 year ago	unknown	0-0 0 seconds
16885	metinersin author:metinersin	feat(ModelTheory/Complexity): define literals	Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification. --- - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-logic	148/5	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	20	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	556-40258 1 year ago	592-29570 592 days ago	0-19926 5 hours
18716	jjaassoonn author:jjaassoonn	feat(Algebra/Module/GradedModule): quotient and subgrading	- [ ] depends on: #9820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR awaiting-CI merge-conflict label:t-algebra$	997/191	Counterexamples/HomogeneousPrimeNotPrime.lean,Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Module/GradedModule/Basic.lean,Mathlib/Algebra/Module/GradedModule/QuotientGrading.lean,Mathlib/Algebra/Module/GradedModule/Subgrading.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Quotient.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/no_lints_prime_decls.txt	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	556-39889 1 year ago	unknown	0-0 0 seconds
9341	winstonyin author:winstonyin	feat: Naturality of integral curves	Let `v` and `v'` be sections of the tangent bundle of manifolds `M` and `M'`, respectively, and let `f : M → M'` be a differentiable map. Then `f` maps integral curves of `v` to integral curves of `v'` if and only if `v` and `v'` are `f`-related. - [x] depends on: #8483 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-differential-geometry	45/0	Mathlib/Geometry/Manifold/IntegralCurve.lean,Mathlib/Topology/Algebra/Module/Basic.lean	2	9	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot', 'winstonyin']	nobody	553-5681 1 year ago	860-62151 860 days ago	0-28222 7 hours
13248	hcWang942 author:hcWang942	feat: basic concepts of auction theory	## Description Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas. This is the very first PR of the project formalizing core concepts and results in auction theory. Our group is working on more contributions on the formalization of game theory prefix. Co-authored-by: Ma Jiajun ## Reference Roughgarden, Tim. *Twenty Lectures on Algorithmic Game Theory*. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B) --- - [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged ## Current plan for formalization of Game Theory The current plan for the formalizing of Game Theory include: #### 1. Auction Theory. 🎉 _(200+ lines, this PR)_ - Essential definitions of Sealed-bid auction, First-price auction and Second-price auction. - First-price auction has no dominant strategy. - Second-price auction has dominant strategy. (Second-price auction is DSIC) #### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard) - Mechanism design An allocation rule is implementable if there exists - Dominant Strategy Incentive Compatible (DSIC) payment rule - An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid - Myerson's Lemma Implementable ⇔ Monotone In the above case, the DSIC payment rule is unique. #### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard) - Equilibrium in zero sum game - Formalization strategy: via Loomis’s theorem. #### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard) #### 5. Brouwer fixed-point theorem. (Work in Progress) #### 6. More Mechanism design. (Planning)	merge-conflict awaiting-author new-contributor t-logic	204/0	Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib	3	148	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp']	hcWang942 assignee:hcWang942	551-79090 1 year ago	565-65278 565 days ago	109-82807 109 days
17675	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchy when searching `FunLike` hierarchy	--- Unification is still very slow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	144/4	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Util/SetSynthOrder.lean,MathlibTest/TCSynth.lean,scripts/noshake.json	24	5	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	551-54223 1 year ago	unknown	0-0 0 seconds
9344	erdOne author:erdOne	feat: Add `AddGroup.FG` -> `Module.Finite ℤ` as instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	4/0	Mathlib/RingTheory/Finiteness.lean	1	4	['alreadydone', 'erdOne', 'leanprover-bot']	nobody	550-63483 1 year ago	849-63926 849 days ago	21-27905 21 days
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	549-73237 1 year ago	700-68873 700 days ago	63-69226 63 days
16637	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` of `(Add)Monoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	46/51	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	20	3	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	549-72475 1 year ago	614-79831 614 days ago	1-49655 1 day
18765	FR-vdash-bot author:FR-vdash-bot	chore: changing `outParam` of `MulActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	60/34	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	4	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	549-28736 1 year ago	unknown	0-0 0 seconds
15822	kmill author:kmill	feat: greedy colorings of finite graphs	Proves that the greedy coloring only takes `G.maxDegree + 1` colors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics	159/0	Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	1	1	['github-actions']	nobody	546-53929 1 year ago	unknown	0-0 0 seconds
8661	joelriou author:joelriou	feat(CategoryTheory/Sites): descent of sheaves	In this PR, it is shown that the category of sheaves on a site `(C, J)` identifies as a full subcategory of a category of families of sheaves equipped with a descent data (for a family of objects which cover the final object). Under suitable conditions, it shall be shown that this is an equivalence of categories (TODO). --- This shall be split in small PRs later. - [x] depends on: #8622 - [x] depends on: #8632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	1396/26	Mathlib.lean,Mathlib/CategoryTheory/Over.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Descent.lean,Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean,Mathlib/CategoryTheory/Sites/InducedTopology.lean,Mathlib/CategoryTheory/Sites/ObjectsCoverTop.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	10	3	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	546-49457 1 year ago	unknown	0-0 0 seconds
19055	JLimperg author:JLimperg	Test precompilation (batteries + aesop) again		merge-conflict	9/8	lake-manifest.json,lakefile.lean	2	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	546-31100 1 year ago	unknown	0-0 0 seconds
10476	shuxuezhuyi author:shuxuezhuyi	feat(Topology/UniformSpace): define uniform preordered space	We define the semi-uniform structure and the uniform preordered space. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	94/0	Mathlib.lean,Mathlib/Topology/UniformSpace/UniformOrder.lean,docs/references.bib	3	2	['shuxuezhuyi']	nobody	545-36111 1 year ago	773-63539 773 days ago	52-19273 52 days
17593	astrainfinita author:astrainfinita	chore(Algebra/Order/GroupWithZero/Unbundled): deprecate useless lemmas, use `ZeroLEOneClass`	There are still some useless lemmas that were simply ported from `Algebra.Order.Monoid.Lemmas`, such as just chain an existing lemma with an assumption and lemmas whose assumptions imply `1 ≤ 0`. This PR removes them. Also, some lemmas have both assumptions like `1 < a` `0 < a`. This PR uses `ZeroLEOneClass` to remove redundant assumptions. --- - [ ] depends on: #17623 Ported from https://github.com/leanprover-community/mathlib/pull/16525 and https://github.com/leanprover-community/mathlib/pull/18158 Adapted from #9250. This version is easier to review. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR t-order label:t-algebra$	188/48	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Order/Field.lean	6	4	['astrainfinita', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	544-59453 1 year ago	585-45034 585 days ago	0-74903 20 hours
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip t-order label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['YaelDillies', 'astrainfinita', 'github-actions', 'j-loreaux']	nobody	544-59453 1 year ago	551-52012 551 days ago	33-64877 33 days
18969	alreadydone author:alreadydone	chore: generalize Module to NonUnitalSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	94/75	Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/LinearDisjoint.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/TensorProduct/Submodule.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/FaithfullyFlat.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Ideal/Lattice.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	31	11	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	542-83105 1 year ago	unknown	0-0 0 seconds
17624	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): generalize lemmas	--- - [ ] depends on: #17623 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR t-order label:t-algebra$	121/26	Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	541-10225 1 year ago	585-43904 585 days ago	0-465 7 minutes
17513	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchies when using `map_*` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-bench label:t-algebra$	5/3	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	2	10	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	539-55647 1 year ago	583-57512 583 days ago	4-72589 4 days
17515	FR-vdash-bot author:FR-vdash-bot	perf: do not need `simp low` now	--- - [ ] depends on: #17513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	12/10	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/NumberTheory/LucasLehmer.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	539-55646 1 year ago	588-43158 588 days ago	0-380 6 minutes
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	538-60892 1 year ago	538-60892 538 days ago	7-68089 7 days
19337	zeramorphic author:zeramorphic	feat(Data/Finsupp): generalise `Finsupp` to any "zero" value	Remove the explicit dependence of `Finsupp` on `[Zero M]`, instead defining `Finsupp'` (better name pending) to be functions that are equal to a fixed value `z : M` cofinitely often. This PR is intended to do the initial work of replacing the definition of `Finsupp` with an instantiation of the more general definition, without adding any appropriate API. If accepted, the API development will follow in later PRs. Issues to consider: - Naming of `Finsupp'.` - Where should `Finsupp'` lemmas go? Do they need their own file/folder under `Data/`? Relevant Zulip threads: - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp.20generalisations - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp-like.20partial.20function Comments are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	203/83	Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/PowerBasis.lean,scripts/nolints_prime_decls.txt	13	5	['github-actions', 'vihdzp', 'zeramorphic']	nobody	536-36969 1 year ago	536-36969 536 days ago	4-60621 4 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	50/28	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	525-2638 1 year ago	525-2638 525 days ago	31-53021 31 days
19125	yhtq author:yhtq	feat: add theorems to transfer `IsGalois` between pairs of fraction rings	feat: add theorems to transfer `IsGalois` between pairs of fraction rings. - [x] depends on: #18404 - [x] depends on: #19124 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra new-contributor label:t-algebra$	121/0	Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	522-15107 1 year ago	548-62889 548 days ago	0-1980 33 minutes
18841	hrmacbeth author:hrmacbeth	chore: change some `linarith`s to `linear_combination`s	Change 100 `linarith`s to `linear_combination`s; this is generally a slight speedup. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #18714 (not strictly blocked by this, but the speed comparison will be more informative after it)	merge-conflict WIP	106/107	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2021Q1.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Probability/Distributions/Pareto.lean	30	29	['github-actions', 'grunweg', 'hrmacbeth', 'jcommelin', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	520-62433 1 year ago	542-84679 542 days ago	3-28253 3 days
11142	hmonroe author:hmonroe	feat(ProofTheory): Define logical symbols abstractly; opens new top-level section, drawing from lean4-logic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	468/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/LogicSymbol.lean	3	19	['PatrickMassot', 'YaelDillies', 'avigad', 'fpvandoorn', 'github-actions']	nobody	514-72253 1 year ago	711-45902 711 days ago	94-3235 94 days
11210	hmonroe author:hmonroe	Test commit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1950/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/Calculus.lean,Mathlib/ProofTheory/FirstOrder/Arith/Language.lean,Mathlib/ProofTheory/FirstOrder/Basic/Syntax/Term.lean,Mathlib/ProofTheory/LogicSymbol.lean,Mathlib/ProofTheory/Matrix.lean,Mathlib/ProofTheory/Semantics.lean,Mathlib/ProofTheory/System.lean,docs/references.bib	10	100	['github-actions']	nobody	514-72252 1 year ago	800-61733 800 days ago	2-67901 2 days
19621	Command-Master author:Command-Master	feat: Multiplicity and prime-adic valuation of derivations	--- - [ ] depends on: #19596 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR large-import label:t-algebra$	397/13	Mathlib.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Derivation/Multiplicity.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	514-54513 1 year ago	534-79862 534 days ago	0-666 11 minutes
18262	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): exterior powers of presheaves of modules	--- - [x] depends on: #18261 - [ ] depends on: #18236 - [ ] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR t-category-theory merge-conflict label:t-algebra$	874/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean,Mathlib/Algebra/Category/ModuleCat/Pseudofunctor.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	514-45808 1 year ago	unknown	0-0 0 seconds
18294	FR-vdash-bot author:FR-vdash-bot	perf: make `Mul.toSMul` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-bench t-algebra label:t-algebra$	2/5	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean	4	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	509-53445 1 year ago	unknown	0-0 0 seconds
15269	kkytola author:kkytola	feat: Add ENNReal.floor	A right-continuous floor function on `ENNReal`. --- - [x] depends on: #13938 - [ ] depends on: #15773 (general type class for `ENat`-valued floor functions) - [x] depends on: #15380 (topology on `ENat` is needed to state right continuity of the floor function) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR t-order merge-conflict awaiting-author label:t-algebra$	445/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENNReal/Floor.lean,Mathlib/Data/Nat/Lattice.lean	4	18	['YaelDillies', 'github-actions', 'kkytola', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	501-26742 1 year ago	650-21808 650 days ago	0-3440 57 minutes
15773	kkytola author:kkytola	feat: Add type class for ENat-valued floor functions	This PR adds a type class for extended natural number -valued floor functions. This is split off from #15269, where the suggestions were to make the floor function on ENNReal ENat-valued and to have an API mimicling FloorSemirings. Besides ENNReal, at least ENNRat would naturally satisfy the general type class. --- Two things are worth noting: * To fully mimic `FloorSemiring` API, also ceiling functions need to be added. The plan is to do that in a later PR. * The PR introduces the class `CastNatENatClass` to ensure that `natCast` and a coercion from `ENat` behave in the natural and order-respecing manner. This feels a little ad hoc, but such assumptions are needed for general `ENat`-valued floor functions to behave well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-order	231/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENat/Basic.lean	3	5	['YaelDillies', 'github-actions', 'kkytola', 'urkud']	nobody	501-26619 1 year ago	577-25972 577 days ago	66-24436 66 days
3251	kmill author:kmill	feat: deriving `LinearOrder` for simple enough inductive types	Uses the same machinery underlying the `Fintype` derive handler to derive a lexicographical `LinearOrder` for non-recursive inductive types that have no indices. In principle more complicated types can have `LinearOrder`s, but that would require a more sophisticated implementation. --- - [x] depends on: #3198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-meta	82/0	Mathlib.lean,Mathlib/Tactic/DeriveLinearOrder.lean	2	5	['ChrisHughes24', 'kim-em', 'kmill', 'vihdzp']	nobody	499-1272 1 year ago	1125-3303 1125 days ago	1-80343 1 day
3610	TimothyGu author:TimothyGu	feat: derive Infinite automatically for inductive types	Deals with recursive types, but not mutually recursive types or types with indices right now. See docstring for details. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	517/0	Mathlib.lean,Mathlib/Tactic/DeriveInfinite.lean,test/DeriveInfinite.lean	3	11	['TimothyGu', 'digama0', 'eric-wieser', 'grunweg', 'kim-em', 'kmill']	kmill assignee:kmill	499-1271 1 year ago	1110-82713 1110 days ago	9-24079 9 days
16120	awainverse author:awainverse	feat(ModelTheory/Algebra/Ring/Basic): Ring homomorphisms are a `StrongHomClass` for the language of rings	Adds an `IsAlgebraic` instance to the language of rings Adds a `StrongHomClass` instance to the type of ring homomorphisms between rings with `CompatibleRing` structures --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra RFC t-logic label:t-algebra$	34/13	Mathlib/ModelTheory/Algebra/Ring/Basic.lean	1	10	['ChrisHughes24', 'YaelDillies', 'awainverse', 'github-actions', 'jcommelin']	nobody	497-18812 1 year ago	497-18812 497 days ago	135-29017 135 days
20459	Ruben-VandeVelde author:Ruben-VandeVelde	chore: fix names of roots_C_mul_X_{add,sub}_C_of_IsUnit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	11/5	Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	2	['eric-wieser', 'github-actions']	nobody	495-43255 1 year ago	495-43255 495 days ago	4-64422 4 days
20527	trivial1711 author:trivial1711	refactor(Topology/UniformSpace/Completion): more descriptive names for `α → Completion α`	- We rename the various maps `α → Completion α` in order to make their names more consistent. - Let `α` be a uniform space. We rename the uniformly continuous function `α → Completion α` from `UniformSpace.Completion.coe'` to `UniformSpace.Completion.coe`. - Let `α` be a uniform additive group. We rename the additive group homomorphism `α →+ Completion α` from `UniformSpace.Completion.toCompl` to `UniformSpace.Completion.coeAddHom`. - Let `α` be a uniform ring. The ring homomorphism `α →+* Completion α` is called `UniformSpace.Completion.coeRingHom`; its name is unchanged. - Let `α` be a normed space over a field `𝕜`. We rename the linear isometry `α →ₗᵢ[𝕜] Completion α` from `UniformSpace.Completion.toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ`. - Let `α` be a normed space over a field `𝕜`. We rename the continuous linear map `α →L[𝕜] Completion α` from `UniformSpace.Completion.toComplL` to `UniformSpace.Completion.coeL`. - Let `α` be a normed additive group. We rename the norm preserving homomorphism `NormedAddGroupHom α (Completion α)` from `NormedAddCommGroup.toCompl` to `UniformSpace.Completion.coeNormedAddGroupHom`. - We analogously rename some other theorems. - We add some trivial theorems (all of which are proved by `rfl`) that state that the functions considered above are equal. We give all of them the `simp` and `norm_cast` attributes. - We add a new theorem `UniformSpace.Completion.coeAddHom_eq_coe` that states that `UniformSpace.Completion.coeAddHom` and `UniformSpace.Completion.coe` are equal as functions. - We similarly add a new theorem `UniformSpace.Completion.coeRingHom_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplL` to `UniformSpace.Completion.coeL_eq_coe`. - We similarly add a new theorem `UniformSpace.Completion.coeNormedAddGroupHom_eq_coe`. - We change all occurrences of the string `((↑) : α → Completion α)` to `(coe : α → Completion α)` or just `coe`. - We put the statements of some theorems into simp normal form by using the plain function `coe` rather than the homomorphisms that carry more structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	130/92	Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Category/UniformSpace.lean,Mathlib/Topology/MetricSpace/Completion.lean,Mathlib/Topology/UniformSpace/Completion.lean	17	4	['eric-wieser', 'github-actions', 'trivial1711']	nobody	490-49844 1 year ago	490-49844 490 days ago	6-66637 6 days
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	488-37119 1 year ago	581-28689 581 days ago	0-4704 1 hour
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-data label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	488-36874 1 year ago	488-36874 488 days ago	76-66907 76 days
20656	Komyyy author:Komyyy	feat(Mathlib/Geometry/Manifold/VectorBundle/Sphere): convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`	Current Mathlib has no easy way to define function from a manifold to tangent bundles of sphere: `T𝕊ⁿ`. This PR gives this: `sphereTangentMap`. This convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`. I also proved that if `f : M → 𝕊ⁿ` & `g : M → ℝⁿ⁺¹` are smooth then `sphereTangentMap` of `f` & `g` is smooth too. --- ⚠ CAUTION I formalized this in my spare time. I don't have the energy to maintain the PR, but I create this PR so this may helps everyone. The only one thing to do is proof cleanup. TODO: - [x] `contDiff_uncurry_stereoInvFunAux` & `coe_sphere_comp_stereoInvFun` may have to be moved to `Mathlib.Geometry.Manifold.Instances.Sphere`. - [ ] Proof cleanup. Current proof may be redundant and ugly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-differential-geometry	246/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/Sphere.lean	3	1	['github-actions']	nobody	487-71808 1 year ago	unknown	0-0 0 seconds
15711	znssong author:znssong	feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle	--- These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem. - [x] depends on: #15536 - [x] depends on: #16294	merge-conflict awaiting-author t-combinatorics new-contributor	407/3	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	22	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong']	nobody	487-56205 1 year ago	608-67366 608 days ago	9-13962 9 days
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	merge-conflict blocked-by-other-PR t-combinatorics new-contributor	903/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	8	3	['github-actions', 'grunweg']	nobody	487-56205 1 year ago	644-73559 644 days ago	0-1791 29 minutes
18629	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.merge	This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15450 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	487-22124 1 year ago	527-21737 527 days ago	33-11262 33 days
14412	jjaassoonn author:jjaassoonn	feat: show stalk of presheaf of modules is a module over stalk of ring	--- - [x] depends on: #14413 - [ ] depends on: #14501 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry blocked-by-other-PR workshop-AIM-AG-2024	966/2	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/OverColimitsRing'.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/OverColimitsRing.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/Module.lean,Mathlib/Topology/Sheaves/Stalks.lean	8	5	['github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot', 'smorel394']	nobody	485-40707 1 year ago	unknown	0-0 0 seconds
8362	urkud author:urkud	feat(Asymptotics): define `ReflectsGrowth`	--- - [x] depends on: #8349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	268/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/ReflectsGrowth.lean	2	14	['YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	485-29378 1 year ago	676-81205 676 days ago	240-47513 240 days
6692	prakol16 author:prakol16	feat: disjoint indexed union of local homeomorphisms	Add disjoint indexed union of local equivs and local homeomorphisms --- This is leading up to PRing some things related to covering spaces that I wrote a long time ago in lean 3 but never submitted a PR for. Note that this was converted using mathport. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	126/0	Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Topology/PartialHomeomorph.lean	2	4	['alreadydone', 'github-actions', 'winstonyin']	nobody	485-13974 1 year ago	577-23993 577 days ago	118-5497 118 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	483-69704 1 year ago	483-69704 483 days ago	69-35596 69 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	482-43783 1 year ago	488-11184 488 days ago	29-51482 29 days
19352	hrmacbeth author:hrmacbeth	chore: change some `nlinarith`s to `linear_combination`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	13/13	Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/NumberTheory/Modular.lean	8	4	['github-actions', 'hrmacbeth', 'leanprover-bot']	nobody	480-72994 1 year ago	542-84699 542 days ago	0-8636 2 hours
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-measure-probability new-contributor	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	475-61131 1 year ago	475-61131 475 days ago	27-43617 27 days
2605	eric-wieser author:eric-wieser	chore: better error message in linarith	On this mwe: ```lean import Mathlib.Tactic.Linarith example (s : Set ℕ) (h : s = s) : 0 ≤ 1 := by linarith ``` this now indicates where the internal error is coming from. Is there a better way of chaining errors than this? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	473-51724 1 year ago	1120-83263 1120 days ago	51-42225 51 days
11837	trivial1711 author:trivial1711	feat: completion of a uniform multiplicative group	Multiplicativize `Topology.Algebra.GroupCompletion`. That is, rewrite it in the multiplicative setting and recover the original results using `@[to_additive]`. - Because `@[to_additive]` doesn't work with `noncomputable section` (https://github.com/leanprover/lean4/pull/2610), some instances with `@[to_additive]` need to be explicitly marked with `noncomputable instance`. - One might be tempted to multiplicativize this definition from `Topology.Algebra.GroupCompletion`: ```lean instance [UniformSpace α] [Add α] : Add (Completion α) := ⟨Completion.map₂ (· + ·)⟩ ``` to this: ```lean @[to_additive] instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨Completion.map₂ (· * ·)⟩ ``` However, as Eric Wieser pointed out, doing so would create a bad diamond with the definition ```lean instance [UniformSpace α] [TopologicalRing α] [UniformAddGroup α] [Ring α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` in `Topology.Algebra.UniformRing`. How should this diamond be resolved? Well, the definition of multiplication that uses `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` is the "correct" one. For example, it yields the correct result if `α` is `ℚ`, unlike the definition that uses `Completion.map₂ (· * ·)`. (This is because `Completion.map₂` yields junk values if used on a function which is not uniformly continuous. Note, however, that if multiplication on `α` is uniformly continuous, then `Completion.map₂ (· * ·)` and `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` are propositionally equal.) So, following Eric's suggestion, we remove the definition that uses `Completion.map₂ (· * ·)`, and generalize the other definition to any uniform space with a multiplication operation: ```lean @[to_additive] noncomputable instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` This requires slightly modifying some of the proofs in `Topology.Algebra.GroupCompletion`. For example, suppose that `α` is a uniform group. Since we can no longer use `Completion.continuous_map₂`, it becomes more efficient to prove that the multiplication, inversion, and division operations on `Completion α` are uniformly continuous before we prove that `Completion α` is a group. - Previously, `Topology.Algebra.GroupCompletion` had an instance: ```lean instance [UniformSpace α] [Sub α] : Sub (Completion α) := ... ``` Naively multiplicativizing this would yield ```lean @[to_additive] instance [UniformSpace α] [Inv α] : Inv (Completion α) := ... ``` Unfortunately, this would conflict with `Topology.Algebra.UniformField`, which already instantiates `Inv (Completion α)` when `α` is a uniform field. Instead, we use two different `instance` declarations. (If `α` is an additive group, then this instantiates `Neg (Completion α)` twice, and the instances are syntactically equal.) ```lean @[to_additive] noncomputable instance [UniformSpace α] [Group α] : Inv (Completion α) := ... instance [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` This avoids the bad diamond (because a uniform field can never be a `Group`) while remaining backward compatible. Note that the `@[to_additive]` is necessary here, because it maintains the link between the additive setting and multiplicative setting. We use a similar method to instantiate `Div (Completion α)`. - Some definitions in this file involve a module structure on `α`. We leave these as is and do not attempt to multiplicativize them at all. - The instance of `DistribMulAction` must be multiplicativized to an instance of `MulDistribMulAction` manually. Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Completion.20of.20a.20uniform.20multiplicative.20group --- # (Small) Issue Recall the following trick that this pull request uses to define inversion and negation on uniform spaces. The idea is that we define negation on the completion of any uniform space that has a negation operation, but we define inversion on only the completion of a uniform space that has the structure of a multiplicative group. We do this to avoid creating a bad diamond with the inversion operation on a uniform field. ```lean @[to_additive] noncomputable instance {α : Type} [UniformSpace α] [Group α] : Inv (Completion α) := ... instance {α : Type} [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` Now, suppose that we want to prove `coe_inv_of_group` (resp. `coe_neg`), which states that the coercion `α → Completion α` commutes with inversion (resp. negation). In the current version of this pull request, `coe_inv_of_group` (resp. `coe_neg`) only applies to uniform multiplicative (resp. additive) groups. However, we do not use the fact that multiplication (resp. addition) on `α` is uniformly continuous to prove it. We only use the fact that inversion (resp. negation) is continuous. So, what we really want is to have more general statements that look like this: ```lean theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Note that `coe_inv_of_group` needs the assumption `[Group α]`, because otherwise inversion is not defined on `Completion α` at all. However, `coe_neg` does not need the analogous assumption `[AdditiveGroup α]`. The question is: If `coe_inv_of_group` and `coe_neg` are written in this more general form, how can we link them using `@[to_additive]`? Here is one option, but it obviously leaves something to be desired. ```lean @[to_additive coe_neg_do_not_use_this_use_the_more_general_version] theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra merge-conflict help-wanted t-topology label:t-algebra$	342/217	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	14	['eric-wieser', 'github-actions', 'trivial1711']	nobody	473-29229 1 year ago	502-41508 502 days ago	101-63310 101 days
12670	trivial1711 author:trivial1711	feat: completion of a nonarchimedean multiplicative group	We prove that the completion of a nonarchimedean multiplicative group is a nonarchimedean multiplicative group. --- - [x] depends on: #12669 - [ ] depends on: #11837 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-topology blocked-by-other-PR label:t-algebra$	358/228	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	473-29106 1 year ago	500-10562 500 days ago	50-17994 50 days
21384	alreadydone author:alreadydone	experiment: make submodule quotient reducibly defeq to additive group quotient	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	1/1	Mathlib/LinearAlgebra/Quotient/Defs.lean	1	1	['github-actions']	nobody	469-40871 1 year ago	unknown	0-0 0 seconds
9449	hmonroe author:hmonroe	feat: Add Turing machine with the quintet definition (TMQ) and a chainable step function for each TM type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	467-80308 1 year ago	812-6960 812 days ago	53-6945 53 days
18719	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `SemilinearMapClass.toAddHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra awaiting-bench label:t-algebra$	14/7	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,MathlibTest/TCSynth.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	466-55125 1 year ago	unknown	0-0 0 seconds
19697	quangvdao author:quangvdao	feat(BigOperators/Fin): Sum/product over `Fin` intervals	This PR adds new theorems about the sum/product of some vector over `Fin` intervals. One example is: ``` @[to_additive] theorem prod_Iic_succ (i : Fin n) : ∏ j ∈ Iic i.succ, v j = (∏ j ∈ Iic i.castSucc, v j) * v i.succ ``` --- - [x] depends on: #20360 This is in preparation for reworking `finSigmaFinEquiv` and `finProdFinEquiv` in #19013. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	87/12	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Order/Interval/Finset/Fin.lean	3	20	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	465-36326 1 year ago	499-72256 499 days ago	6-25961 6 days
19353	hrmacbeth author:hrmacbeth	chore: golf some term/rw proofs using `linear_combination`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	47/102	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean	7	5	['github-actions', 'grunweg', 'hrmacbeth', 'leanprover-bot']	grunweg assignee:grunweg	464-35447 1 year ago	542-84691 542 days ago	0-7781 2 hours
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import new-contributor merge-conflict awaiting-author t-topology	1189/813	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean	9	22	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	463-18441 1 year ago	469-69358 469 days ago	39-21495 39 days
21610	JLimperg author:JLimperg	Aesop forward benchmark: forward precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	462-54332 1 year ago	unknown	0-0 0 seconds
21611	JLimperg author:JLimperg	Aesop forward benchmark: master no-precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	4	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	462-54331 1 year ago	unknown	0-0 0 seconds
21612	JLimperg author:JLimperg	Aesop forward benchmark: master precomp	Not a real PR, just for benchmarking.	merge-conflict	30/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	462-54330 1 year ago	unknown	0-0 0 seconds
10678	adri326 author:adri326	feat(Topology/UniformSpace): prove that a uniform space is completely regular	Provides the pseudometric definition of a uniform space (for any open set `s` and `x ∈ s`, there exists a finite family of pseudometric spaces on `X` and an `ε > 0`, such that the intersection of the balls of these pseudometric spaces is a subset of `s`), and uses it to prove that `UniformSpace X` implies `CompletelyRegularSpace X`. --- This PR aims to close the gap of pi-base's theorem [T345](https://topology.pi-base.org/theorems/T000345), which says that topological groups are completely regular. We already have a proof that topological groups are uniform, but it turns out that we do not have any connection between `UniformSpace X` and `CompletelyRegularSpace X`. There is an equivalence between `UniformSpace X` and `CompletelyRegularSpace X`: the former implies the latter, and the latter implies the existence of the former. This PR provides the first half of this equivalence. The construction of the pseudometric definition is based on N. Bourbaki, Chapter 9, Theorem 4.1 The proof that a uniform space is completely regular is based on [the outline on mathexchange](https://math.stackexchange.com/questions/494718/how-to-prove-that-every-uniform-space-is-completely-regular). I tried to outline the major steps of the different proofs inside of comments; I can happily be more verbose to clear up any confusion. See [the corresponding Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Some.20missing.2C.20accessible.2C.20topology.20results) for more context. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	332/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/CompletelyRegular.lean	3	6	['ADedecker', 'adri326']	ADedecker assignee:ADedecker	462-29858 1 year ago	803-53537 803 days ago	17-44804 17 days
18785	erdOne author:erdOne	feat(CategoryTheory): command that generates instances for `MorphismProperty`	Co-authored-by: Calle Sönne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory t-meta	369/0	Mathlib.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean,scripts/noshake.json	4	19	['alexjbest', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'joelriou']	nobody	460-46368 1 year ago	481-74638 481 days ago	52-4682 52 days
16311	madvorak author:madvorak	feat(Computability): regular languages are context-free	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-computability	72/0	Mathlib.lean,Mathlib/Computability/Chomsky.lean,Mathlib/Computability/ContextFreeGrammar.lean	3	7	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'madvorak']	nobody	458-52787 1 year ago	unknown	0-0 0 seconds
19943	AlexLoitzl author:AlexLoitzl	feat(Computability): Add Chomsky Normal Form Grammar and translation	- Define Chomsky normal form grammars - Add language-preserving translation between context-free grammars and Chomsky normal form grammars Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	3151/0	Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean	8	59	['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak']	nobody	458-52540 1 year ago	465-64162 465 days ago	37-29014 37 days
21501	sksgurdldi author:sksgurdldi	feat(List): add sum_zipWith_eq_finset_sum	### Description: This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`. #### Statement: The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths. #### Formal Statement: ```lean lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ] {op : α → β → γ} (l : List α) (m : List β) : (List.zipWith op l m).sum = ∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!) ``` #### Remarks: - This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`. - It can be helpful in algebraic manipulations involving list-based summations. #### Dependencies: No additional dependencies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	453-21311 1 year ago	453-21311 453 days ago	13-33168 13 days
12054	adomani author:adomani	feat: auto-bugs	This PR introduces a linter for suggesting bugs in tactics. See * #12077 * #12083 * #12084 for some bugs exposed by the test suite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	737/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/MetaTesting.lean,scripts/noshake.json,test/MetaTesting.lean	5	20	['adomani', 'eric-wieser', 'github-actions', 'joneugster', 'kim-em']	joneugster assignee:joneugster	453-8968 1 year ago	665-67386 665 days ago	45-6051 45 days
5062	adomani author:adomani	feat(Tactic/Prune + test/Prune): add `prune` tactic, for removing unnecessary hypotheses	This tactic removes very conservatively all local declarations that 1. do not appear in the main goal, 2. do not appear in a declaration that appears in the main goal, 3. ... and so on recursively. The main motivation for this tactic is that all available variables in the current `namespace/section` appear in the goal state, not just the ones that are needed for the statement to type-check. Using `prune` mitigates this situation. The tactic also admits an optional natural number argument: `prune n` removes all variables that have not appeared at the `(n+1)`-st stage in the above list. Thus, `prune 0` only leaves the variables needed for the statement to type-check. Also, for sufficiently large `n`, `prune n` is a synonym for `prune`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/substitute.20for.20.60include.2Fomit.60.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict modifies-tactic-syntax awaiting-author t-meta	181/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Prune.lean,test/Prune.lean	4	5	['adomani', 'j-loreaux', 'kmill']	nobody	452-62675 1 year ago	873-48006 873 days ago	195-57118 195 days
22169	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp naive	Not a real PR, just for benchmarking.	merge-conflict	31/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	6	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	451-28339 1 year ago	unknown	0-0 0 seconds
21433	grunweg author:grunweg	chore: change more lemmas to be about enorm instead of nnnorm	--- - [x] depends on: #21782 - [x] depends on: #21783 (and this PR modifies the file split, and file splits are painful to merge over) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author carleson t-measure-probability	172/71	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean	9	18	['RemyDegenne', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	451-27528 1 year ago	458-23593 458 days ago	2-37989 2 days
22171	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp naive rpinf pr-release	Not a real PR, just for benchmarking.	merge-conflict	31/27	Mathlib/Data/List/InsertIdx.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	450-36212 1 year ago	unknown	0-0 0 seconds
20454	urkud author:urkud	chore(TangentCone): review names	Also add some `@[simp]` attrs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	201/139	Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	25	3	['github-actions', 'sgouezel', 'urkud']	nobody	446-74108 1 year ago	496-27471 496 days ago	4-8272 4 days
21608	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp rpinf pr-release	Not a real PR, just for benchmarking.	merge-conflict	38/29	Mathlib/Data/List/InsertIdx.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	8	13	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	446-48841 1 year ago	unknown	0-0 0 seconds
21609	JLimperg author:JLimperg	Aesop forward benchmark: forward no-precomp	Not a real PR, just for benchmarking.	merge-conflict	38/29	Mathlib/Data/List/InsertIdx.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Tactic/Recall.lean,Mathlib/Topology/List.lean,Test.lean,lake-manifest.json,lakefile.lean,lean-toolchain	8	13	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	446-47205 1 year ago	unknown	0-0 0 seconds
16550	awainverse author:awainverse	feat(ModelTheory): A typeclass for languages expanding other languages	Defines `L.Expands L'` to consist of a privileged injective inclusion, `L'.Inclusion L`, from `L'` to `L`, corresponding to one language being a subset of the other in set-theoretic foundations. Replaces `L.IsOrdered` with `L.Expands Language.order` and `L.OrderLHom` with `Language.order.Inclusion L` Redefines `leSymb` in terms of `Language.order.Inclusion L` Deletions: - `FirstOrder.Language.IsOrdered` - `FirstOrder.Language.OrderLHom` - `instance : IsOrdered Language.order` - `sum.instIsOrdered` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	97/43	Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Order.lean	2	9	['YaelDillies', 'awainverse', 'github-actions']	nobody	446-26576 1 year ago	618-57807 618 days ago	0-61590 17 hours
10823	alexkeizer author:alexkeizer	feat: convert curried type functions into uncurried type functions	Adds a conversion `TypeFun.ofCurried : CurriedTypeFun.{u, v} n -> TypeFun.{u, v} n`, where `CurriedTypeFun.{u,v} n` is a (def-eq) abbreviation for `Type u -> ... -> Type u -> Type v`, i.e., the type of curried functions taking `n` arguments of type `Type u` to return an element of `Type v`, and `TypeFun.{u, v} n` is an abbreviation for `TypeVec.{u} n -> Type v`. It is generally more idiomatic to define type functions with multiple arguments in the curried style, but in the QPF development we use the uncurried equivalent `TypeVec n -> Type _`. Thus, having a canonical conversion from curried functions to uncurried gives us a canonical way to ask if a curried type function, say `Sum` is a QPF (namely, "is there an instance of `MvQPF (TypeFun.ofCurried Sum)`"). --- This is code ported from https://github.com/alexkeizer/QpfTypes, where this conversion is crucial in presenting a high-level interface, in terms of idiomatic, curried, type functions to users, while being built on QPFs (and thus, uncurried typefunctions) underneath. There is also a conversion in the other direction, from uncurried to curried, which I've decided to PR later, to keep this PR smaller and hopefully easier to review. - [x] depends on: #10818 (all changes to `Fin2.lean` are part of 10818, not the current PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	66/0	Mathlib.lean,Mathlib/Data/TypeFun.lean	2	9	['YaelDillies', 'alexkeizer', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	443-39169 1 year ago	694-23769 694 days ago	15-9013 15 days
13648	urkud author:urkud	feat(Topology/Module): generalize `ContinuousLinearMap.compSL`	Generalize `ContinuousLinearMap.compSL` to topological vector spaces. --- - [ ] depends on: #15217 This PR is not polished yet, but the main statement is there. @ADedecker This answers a question I asked you on Zulip a few months ago. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author t-topology t-analysis label:t-algebra$	23/18	Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	2	5	['fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	441-62259 1 year ago	679-45186 679 days ago	28-69042 28 days
19372	Command-Master author:Command-Master	find defeq abuse using diagnostics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #19177	merge-conflict blocked-by-other-PR large-import	169/1	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/FindDefEqAbuse.lean,MathlibTest/FindDefEqAbuse.lean,lakefile.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	441-61759 1 year ago	unknown	0-0 0 seconds
22408	JLimperg author:JLimperg	Aesop forward bench: precomp only rpinf	--- Not a real PR (yet), just for benchmarking. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict dependency-bump	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	6	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	441-50663 1 year ago	unknown	0-0 0 seconds
20636	eric-wieser author:eric-wieser	feat: multiplication of intervals in rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	36/1	Mathlib/Algebra/Order/Interval/Basic.lean	1	16	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	440-34228 1 year ago	476-38005 476 days ago	17-17852 17 days
22340	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Beck-Chevalley Conditions)	Building on top of the API of `ExponentiableMorphism` in #22321, we state and prove Beck-Chevalley conditions. This will be crucial for our development of polynomial functors along exponentiable morphisms. Co-authored-by: Emily Riehl --- - [ ] depends on: #22321 - [ ] depends on: #22319 - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory large-import merge-conflict	1144/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/BeckChevalley.lean,docs/references.bib	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	439-50810 1 year ago	446-32737 446 days ago	0-17 17 seconds
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology new-contributor	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	439-47152 1 year ago	439-47152 439 days ago	16-76141 16 days
19177	adomani author:adomani	test: the findDefEqAbuse linter	This is a prototype, as per [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Locating.20defeq.20abuse) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict large-import	126/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/FindDefEqAbuse.lean,MathlibTest/FindDefEqAbuse.lean	5	1	['github-actions']	nobody	437-49165 1 year ago	unknown	0-0 0 seconds
22359	adomani author:adomani	feat(whitespace): do not allow indented doc-strings	In a doc-string, Do not allow the first character after the first line break to be a space. --- There are approximately 2.5k exceptions. I think that they should be unindented, judging from the sample that I looked at, but won't act on it, unless there is a clear plan to fix and merge this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	222/70	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Init.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/LinearAlgebra/Dimension/StrongRankCondition.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/LintDocstring.lean,lakefile.lean	20	1	['github-actions']	nobody	437-48084 1 year ago	445-74157 445 days ago	0-2590 43 minutes
18470	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Normed.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-analysis label:t-algebra$	28/0	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean	2	9	['astrainfinita', 'github-actions', 'jcommelin', 'leanprover-bot']	nobody	435-18579 1 year ago	435-18579 435 days ago	129-16341 129 days
17368	Felix-Weilacher author:Felix-Weilacher	feat(Topology/Baire/BaireMeasurable): add the Kuratowski-Ulam theorem	Add the Kuratowski-Ulam theorem, which one can think of as a "Fubini" for Baire category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	187/1	Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/GDelta/Basic.lean	5	6	['Felix-Weilacher', 'github-actions', 'urkud']	nobody	433-42648 1 year ago	570-54167 570 days ago	22-48725 22 days
8767	eric-wieser author:eric-wieser	refactor(Cache): tidy lake-manifest parsing in Cache	This now respects local copies of Mathlib dependencies (though in practice these invalidate the online cache because to point to local copies of Mathlib, the hash for `lakefile.lean` and `lake-manifest.json` is first invalidated). --- - [x] depends on: #11492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	432-18311 1 year ago	613-70661 613 days ago	119-35643 119 days
22434	qawbecrdtey author:qawbecrdtey	feat(Mathlib/Analysis/Normed/Lp/WithLp): Added more instances for `WithLp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	51/22	Mathlib/Analysis/Normed/Lp/WithLp.lean	1	11	['eric-wieser', 'github-actions', 'leanprover-bot', 'qawbecrdtey']	nobody	431-47750 1 year ago	438-17015 438 days ago	1-79072 1 day
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis new-contributor	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	431-42978 1 year ago	614-46207 614 days ago	29-48368 29 days
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	427-69407 1 year ago	427-69407 427 days ago	10-48025 10 days
13999	adomani author:adomani	feat: a linter to flag potential confusing conventions	Currently, the linter flags all uses of * `a - b` where `a b : Nat`; * `a / b` where `a b : Nat` or `a b : Int`; * `a / 0` more or less whenever the type of `a` has a `0` and a division. This comes up often when starting to use Lean and hopefully the flag can help mitigate initial confusions. When the local context contains the relevant inequality/divisibility hypothesis, the linter is quiet. A recent [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/not.20understanding.20deliberate.20error.20with.20.60ring.60.20over.20.E2.84.95/near/445879310) --- To make sure that the linter does not produce errors, #14007 activates the linter on "all" of mathlib. The expectation is that no error is thrown, just warnings. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	251/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Papercut.lean,MathlibTest/Papercut.lean	4	24	['Julian', 'YaelDillies', 'adomani', 'eric-wieser', 'github-actions']	nobody	427-15041 1 year ago	687-78932 687 days ago	7-47589 7 days
19013	quangvdao author:quangvdao	feat(Algebra/BigOperators/Fin): Add `finSigmaFinEquiv`	This PR adds `finSigmaFinEquiv` which is the equivalence `(i : Fin m) × Fin (n i) ≃ Fin (∑ i, n i)`. This is the dependent version of `finProdFinEquiv`. CI should be passing, but there are two things I'd like feedback on: 1. When defining the mappings, I have to consider `m = 0` separately. Is there a more uniform definition? 2. I'm proving this as a step toward defining `Fin.join`, which is the analogue of `List.join`. I can now technically define `Fin.join` as: ``` variable {a : Fin n → ℕ} {α : (i : Fin n) → (j : Fin (a i)) → Sort*} def join (v : (i : Fin n) → (j : Fin (a i)) → α i j) (k : Fin (∑ i, a i)) : α (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 := v (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 ``` but this looks horrible. This highly motivates refactoring `invFun` as two new definitions: ``` def func1 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin n := sorry def func2 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin (a (func1 a k)) := sorry ``` I'm not sure what to call these functions. The analogues in the non-dependent case are `divNat` and `modNat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	92/16	Mathlib/Algebra/BigOperators/Fin.lean	1	14	['YaelDillies', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	425-37074 1 year ago	547-15002 547 days ago	3-28829 3 days
20389	eric-wieser author:eric-wieser	feat: generalize results to `WithLp 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	116/53	Mathlib/Analysis/Normed/Lp/PiLp.lean	1	1	['github-actions']	nobody	424-25622 1 year ago	unknown	0-0 0 seconds
19227	adomani author:adomani	fix(CI): unwrap `lake test` in problem matcher	... and also add a `#guard_msgs` in `AssertImported` test, so that `lake test` properly fails. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/CI.3A.20noisy.20.22test.20mathlib.22/near/483126955) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	9/20	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,MathlibTest/AssertImported.lean	5	2	['bryangingechen', 'github-actions']	nobody	422-56110 1 year ago	523-10381 523 days ago	22-71271 22 days
15774	kkytola author:kkytola	feat: Topology on `ENat`	This PR may contain some results that are not in the PR that adds a toppology on `ENat`. --- The immediate motivation is to be able to make the right continuity statement of the extended floor function on `ENNReal`, when this floor function is made `ENat`valued as suggested in the PR review of #15269. The API here is modelled on the early parts of [the corresponding ENNReal file](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Instances/ENNReal.html#top), although much of this case is more trivial. - [x] depends on: #15380 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology t-order	161/9	Mathlib/Data/ENat/Basic.lean,Mathlib/Topology/Instances/ENat.lean	2	4	['YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	418-13642 1 year ago	643-43185 643 days ago	0-6819 1 hour
16009	Command-Master author:Command-Master	acyclic graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-combinatorics	232/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	1	['github-actions']	nobody	416-48191 1 year ago	unknown	0-0 0 seconds
20222	eric-wieser author:eric-wieser	feat: generalize lemmas about derivatives	Rather than creating a huge diff by shuffling things around, this generalizes everything in-place and swaps between `section`s for topological and normed vector spaces. The rationale for this approach is that: * we may further generalize the results of this file, and this avoids us jumbling up the order multiple times unnecessarily. * this greatly reduces the chance of merge conflicts --- - [ ] depends on: #21065 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-analysis	554/50	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,MathlibTest/Recall.lean	3	8	['adomani', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	413-70310 1 year ago	476-83552 476 days ago	7-27718 7 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data enhancement new-contributor merge-conflict awaiting-author	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	17	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	412-78377 1 year ago	438-20933 438 days ago	23-22681 23 days
23514	eric-wieser author:eric-wieser	refactor: smooth over Lattice/LinearOrder inheritance	This fixes the forgetful inheritance in `CompleteLinearOrder` and `ConditionallyCompleteLinearOrder`, which previously did not carry `compare` fields. (edit: moved to #23515) The following is the inheritance diagram before, where the dotted lines are manual instances. Note that every lattice typeclass that extends `LinearOrder` has to implement another dotted line edge, and remember to copy all the necessary data fields. ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> PartialOrder; Lattice --> PartialOrder; CompleteLinearOrder --> Lattice; ConditionallyCompleteLinearOrder --> Lattice; LinearOrder-.-> Lattice; CompleteLinearOrder -.-> LinearOrder; ConditionallyCompleteLinearOrder -.-> LinearOrder; ``` This change introduces two new auxiliary typeclasses, to encapsulate these troublesome edges. `LinearOrderedLattice` can be thought of as `LinearOrder`, but with `sup`/`inf` instead of `min`/`max`. This is crucial, because it ensures the duplicate fields are merged in `extends CompleteLattice X, LinearOrderedLattice X`, which would not be the case for `extends CompleteLattice X, LinearOrder X`. The result is: ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> LinearOrderBase; LinearOrderBase --> PartialOrder; Lattice --> PartialOrder; LinearOrderedLattice -.-> LinearOrder; LinearOrderedLattice --> LinearOrderBase; LinearOrderedLattice --> Lattice; CompleteLinearOrder --> LinearOrderedLattice; ConditionallyCompleteLinearOrder --> LinearOrderedLattice; ``` --- - [ ] depends on: #23515 - [ ] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/66	Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Order/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Lattice.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	412-17807 1 year ago	413-22746 413 days ago	0-172 2 minutes
20746	JLimperg author:JLimperg	Aesop forward branch test	--- This is not a real PR; I just want to benchmark this Aesop branch. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	14/6	.github/workflows/build.yml,Mathlib/Data/Nat/Prime/Defs.lean,lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	6	11	['JLimperg', 'Kha', 'github-actions', 'leanprover-bot']	nobody	411-61613 1 year ago	unknown	0-0 0 seconds
22810	pechersky author:pechersky	feat(Counterexamples): metric space not induced by norm	Because the distance is not homogeneous --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #22845	merge-conflict WIP t-topology t-analysis	202/1	Counterexamples.lean,Counterexamples/NotBoundedSMulMetricSpace.lean,Mathlib.lean,Mathlib/Analysis/Normed/PiNat.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/MetricSpace/Polish.lean	6	21	['eric-wieser', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	411-54269 1 year ago	427-1360 427 days ago	0-82394 22 hours
13124	FR-vdash-bot author:FR-vdash-bot	chore: remove `CovariantClass` and `ContravariantClass`	Lean cannot handle `CovariantClass` and `ContravariantClass` correctly - TC slowness - [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/TC.20slowness) - https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488 - It may also have made #6326 fail. - Needs a weird hack to find instance: #9252 --- - [x] depends on: #13154 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/486	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean	37	6	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	410-82246 1 year ago	unknown	0-0 0 seconds
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	t-measure-probability new-contributor merge-conflict awaiting-author t-analysis	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	407-73366 1 year ago	601-50737 601 days ago	51-85104 51 days
22888	plp127 author:plp127	perf: replace `Lean.Expr.swapBVars` with a better? implementation	Replaces `Lean.Expr.swapBVars` with a version that traverses the expression. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	14/12	Mathlib/Tactic/FunProp/ToBatteries.lean	1	23	['eric-wieser', 'github-actions', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127']	eric-wieser and joneugster assignee:eric-wieser assignee:joneugster	406-66411 1 year ago	427-29851 427 days ago	4-80306 4 days
15943	urkud author:urkud	feat: add `ProdQuotientMapSpace`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	731/11	Mathlib.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Maps/ProdQuotient.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	406-5338 1 year ago	unknown	0-0 0 seconds
22579	kvanvels author:kvanvels	doc(Topology/Defs/Induced): fix comments on three functions related to RestrictGenTopology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology documentation awaiting-author	10/9	Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/RestrictGen.lean	2	4	['github-actions', 'kvanvels', 'leanprover-community-bot-assistant', 'urkud']	nobody	404-80269 1 year ago	427-84646 427 days ago	12-18679 12 days
19771	robertylewis author:robertylewis	perf: qqify two functions in linarith	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	17/24	Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Verification.lean	2	5	['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'robertylewis']	nobody	404-59775 1 year ago	unknown	0-0 0 seconds
22308	plp127 author:plp127	feat (Analysis/Convex): Generalize `Convex` lemmas to `StarConvex`	This PR generalizes many lemmas assuming `Convex 𝕜 s` to assume `StarConvex 𝕜 0 s`. --- - [x] depends on: #22421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis new-contributor	30/18	Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean	4	5	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-59286 1 year ago	unknown	0-0 0 seconds
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory new-contributor	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	404-55554 1 year ago	404-55555 404 days ago	58-6026 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory large-import	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	404-55552 1 year ago	404-55554 404 days ago	36-69400 36 days
22319	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Sections Right Adjoint)	we define the `Over.sections` functor in the file `CategoryTheory.Comma.Over.Sections` and prove that it is a right adjoint to the `Over.star`, thereby solving an existing TODO in `Over.pullback` file. The `sections` functor is used to define the right adjoint to the pullback functor `Over.pullback` in the development of LCCCs. Moreover, the rest of added lemmas and theorems to `CategoryTheory.Comma.Over.Pullback` are crucial for the development of LCCCs in the next PR. --- - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	547/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-55025 1 year ago	446-59060 446 days ago	0-2084 34 minutes
22321	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Definition)	This PR defines locally cartesian closed categories in terms of existence of the pushforward functors (right adjoint to the pullback functor) for all morphisms. We develop basic API and prove the following: 1. Existence of the pushforward functors is equivalent to cartesian closed slices. 2. Any locally cartesian closed category with a terminal object is cartesian closed. 3. The slices of a locally cartesian closed category are locally cartesian closed. Some of the content is based on the project of formalization of polynomial functors at the Trimester "Prospect of Formal Mathematics" at the Hausdorff Institute (HIM) in Bonn. https://github.com/sinhp/Poly I found this implementation of locally cartesian closed categories amenable to polynomial functors formalization. Co-authored-by: Emily Riehl --- - [ ] depends on: #21525 - [ ] depends on: #22319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	812/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-55025 1 year ago	446-57801 446 days ago	0-336 5 minutes
13653	adomani author:adomani	feat: the unusedSetOptionIn linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter large-import	199/0	Mathlib.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnnecessarySetOptionIn.lean,MathlibTest/UnnecessarySetOptionIn.lean	6	15	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	403-86390 1 year ago	unknown	0-0 0 seconds
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	403-68086 1 year ago	536-56503 536 days ago	1-41769 1 day
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	403-58282 1 year ago	478-51042 478 days ago	5-5648 5 days
22817	peabrainiac author:peabrainiac	feat(CategoryTheory/Sites): local sites	Defines local sites and shows that sheaves of types on them form a local topos, in that the global sections functor `Sheaf.Γ` has a right adjoint `Sheaf.codisc` that is fully faithful. --- - [x] depends on: #22816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	263/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Sites/GlobalSections.lean,Mathlib/CategoryTheory/Sites/LocalSite.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean	6	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	402-78291 1 year ago	433-79790 433 days ago	0-568 9 minutes
24040	astrainfinita author:astrainfinita	refactor: unbundle algebra from `(NonUnital){Seminormed, Normed}(Comm)Ring`	--- - [ ] depends on: #23966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR merge-conflict slow-typeclass-synthesis t-analysis label:t-algebra$	3775/3674	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean	630	5	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	399-48985 1 year ago	unknown	0-0 0 seconds
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	398-80518 1 year ago	398-80520 398 days ago	55-52030 55 days
23509	eric-wieser author:eric-wieser	refactor: Make ENNReal an abbrev	The `Coe` instance becomes `CoeTC` to match what we do for `WithTop` (such that the priority kicks in) Probably we could have both copies and things would be ok. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This includes part of #23750	merge-conflict t-data	22/66	Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/BigOperators.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean,Mathlib/Topology/MetricSpace/PartitionOfUnity.lean	7	22	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mattrobball', 'urkud']	nobody	398-64171 1 year ago	400-48899 400 days ago	5-23475 5 days
24060	eric-wieser author:eric-wieser	chore(MeasureTheory): use `0` instead of `const _ 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-measure-probability	30/20	Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Probability/StrongLaw.lean	7	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	398-53866 1 year ago	unknown	0-0 0 seconds
24058	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*NormedField`	--- - [ ] depends on: #24040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR merge-conflict slow-typeclass-synthesis t-analysis label:t-algebra$	4602/4346	Archive/Hairer.lean,Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean	665	7	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	398-43776 1 year ago	unknown	0-0 0 seconds
11455	adomani author:adomani	fix: unsqueeze simp, re Yaël's comments on #11259	This PR reverts/simplifies some of the "squeeze `simp`" changes in #11259. See #11259 for context. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	3/6	Mathlib/Algebra/Group/Conj.lean,Mathlib/Data/Seq/WSeq.lean	2	8	['Ruben-VandeVelde', 'YaelDillies', 'grunweg', 'loefflerd', 'robertylewis', 'urkud']	nobody	398-25771 1 year ago	696-55678 696 days ago	93-60645 93 days
7325	eric-wieser author:eric-wieser	chore: use preimageIso instead of defeq abuse for InducedCategory	This makes a few things slightly more verbose, but the type casts are now explicit in those places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory awaiting-CI	22/21	Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean	3	1	['grunweg']	nobody	398-25650 1 year ago	unknown	0-0 0 seconds
7874	astrainfinita author:astrainfinita	chore: make `IsScalarTower A A B` and `IsScalarTower A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra awaiting-CI label:t-algebra$	10/9	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/GroupTheory/GroupAction/Ring.lean	4	3	['astrainfinita', 'grunweg', 'leanprover-bot']	nobody	398-25625 1 year ago	unknown	0-0 0 seconds
13038	adomani author:adomani	feat: Mathlib weekly reports	This PR introduces a weekly cron job that computes a "global" report on the evolution of Mathlib in the previous week. It consists of * a CI workflow with a cron job that runs at minight on Sunday (`.github/workflows/mathlib_stats.yaml`); * a Lean file extracting a categorized list of "all" the declarations in Mathlib (`scripts/count_decls.lean`); * a bash file computing Git-diff-related information and collating the data from the Lean file (`scripts/mathlib_stats.sh`); * a convenience CI workflow that is triggered on adding the `test-ci` label and results in posting on the PR and on Zulip the report (`.github/workflows/mathlib_stats_label.yaml`). The second CI workflow is intended to be removed just before/right after the PR is ready to merge. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general) [Thread for the reports](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Mathlib.20weekly.20change.20report) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI t-meta	338/0	.github/workflows/mathlib_stats.yaml,.github/workflows/mathlib_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	10	['adomani', 'github-actions', 'grunweg', 'kim-em', 'kmill']	nobody	398-25583 1 year ago	672-43463 672 days ago	57-4374 57 days
5952	eric-wieser author:eric-wieser	feat: add Qq wrappers for ToExpr	--- - [ ] depends on: #6699 (to appease the linter) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI t-meta	247/150	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Tactic/DeriveToExpr.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/ToExpr.lean,Mathlib/Util/Qq.lean,test/DeriveToExpr.lean,test/vec_notation.lean	9	7	['eric-wieser', 'gebner', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	398-25451 1 year ago	1004-68714 1004 days ago	29-67421 29 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	114/60	Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/Topology/Algebra/Group/Compact.lean	6	14	['astrainfinita', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	398-25411 1 year ago	646-63741 646 days ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	240/92	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Util/NoInstances.lean,scripts/noshake.json	50	8	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	398-25187 1 year ago	602-64734 602 days ago	14-58900 14 days
24106	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*CStarAlgebra`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #24058	t-algebra blocked-by-other-PR merge-conflict slow-typeclass-synthesis t-analysis label:t-algebra$	4702/4459	Archive/Hairer.lean,Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Analysis/CStarAlgebra/Hom.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean	670	5	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	397-83317 1 year ago	unknown	0-0 0 seconds
13780	adomani author:adomani	deprecate injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	31/9	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Init/Function.lean,lake-manifest.json,lakefile.lean	7	2	['github-actions', 'grunweg']	nobody	397-79101 1 year ago	unknown	0-0 0 seconds
19467	quangvdao author:quangvdao	feat(MvPolynomial/Equiv): Add `MvPolynomial.finSuccEquivNth`	This PR adds `MvPolynomial.finSuccEquivNth`, which is the algebra isomorphism between `MvPolynomial (Fin (n + 1)) R` and `Polynomial (MvPolynomial (Fin n) R)` by identifying the `p`-th variable as the indeterminate. This generalizes `MvPolynomial.finSuccEquiv` which is only for the `0`-th variable. The supporting theorems for the `Nth` version are identical to the current version, with the `Nth` version deduced from the former. These changes require new definitions in `Finsupp/Fin`, which is a separate PR. Co-authored-by: Yaël Dillies --- - [ ] depends on: #19315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	541/163	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Fin.lean,scripts/nolints_prime_decls.txt	7	9	['acmepjz', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	396-29527 1 year ago	539-49493 539 days ago	0-790 13 minutes
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis new-contributor	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	396-29480 1 year ago	479-40727 479 days ago	8-42257 8 days
22698	Kiolt author:Kiolt	feat: notation for whisker(Left/Right)Iso	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory toric	175/113	Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Bicategory/Extension.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean,Mathlib/CategoryTheory/Bicategory/SingleObj.lean,Mathlib/CategoryTheory/Closed/Functor.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/BicategoricalComp.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean	27	21	['Kiolt', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-bot']	nobody	396-29309 1 year ago	432-48666 432 days ago	3-29299 3 days
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	396-25612 1 year ago	476-16585 476 days ago	13-56244 13 days
19117	eric-wieser author:eric-wieser	feat: derivatives of matrix operations	These are finally possible to state after #19108. However, a lot of bundled `ContinuousLinearMap`s are missing. --- - [x] depends on: #19108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	336/22	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Matrix.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	394-47990 1 year ago	unknown	0-0 0 seconds
12605	FR-vdash-bot author:FR-vdash-bot	chore: attribute [induction_eliminator]	Add attribute [induction_eliminator] to `AdjoinRoot.induction_on` `ENat.recTopCoe` `ENNReal.recTopCoe` `Finset.induction` `Magma.AssocQuotient.induction_on` `ManyOneDegree.ind_on` `Module.Ray.ind` (and add `Orientation.ind` for `Orientation`, an abbrev of it. I wish that we do not need to add it in the future.) `Multiset.induction` `MvPolynomial.induction_on` `OnePoint.rec` `Opposite.rec'` `Ordinal.limitRecOn` `PartENat.casesOn` `Polynomial.induction_on'` `QuotientAddGroup.induction_on'` (and add `AddCircle.induction_on` for `AddCircle`, an abbrev of it. I wish that we do not need to add it in the future.) `QuotientGroup.induction_on'` (doesn't actually work) `Real.Angle.induction_on` `SimplexCategory.rec` `Trunc.induction_on` --- - [x] depends on: #13476 - [x] depends on: #13264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	354/342	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/BigOperators/Group/Multiset.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval.lean,Mathlib/Algebra/Polynomial/Induction.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolynomialExp.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Compression/Down.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Fold.lean,Mathlib/Data/Multiset/Lattice.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Powerset.lean,Mathlib/Data/Multiset/Sections.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Pointwise/BigOperators.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Logic/Hydra.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Measure/AddContent.lean	140	14	['YaelDillies', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	394-42605 1 year ago	726-74176 726 days ago	4-46495 4 days
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	391-68428 1 year ago	404-79069 404 days ago	0-265 4 minutes
24219	Paul-Lez author:Paul-Lez	feat: linear independence of the tensor product of two linearly independent families	This is still WIP (the proofs are a little too long, and some lemmas need to be moved to other files!) From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra toric label:t-algebra$	193/0	Mathlib/LinearAlgebra/LinearIndependent/Tprod.lean	1	1	['github-actions']	nobody	391-47860 1 year ago	393-62761 393 days ago	0-2221 37 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	389-45203 1 year ago	389-45205 389 days ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	389-33900 1 year ago	389-33901 389 days ago	2-11655 2 days
14931	eric-wieser author:eric-wieser	feat: volume of a simplex	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-euclidean-geometry	207/0	Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Volume.lean	3	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	387-46357 1 year ago	unknown	0-0 0 seconds
22583	imathwy author:imathwy	feat: affinespace homeomorphism	There exists a homeomorphism (a continuous bijection with a continuous inverse) between an affine subspace s of a vector space V over a field 𝕜 and its direction s.direction , given a chosen point z ∈ s . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	64/2	Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/MulAction.lean	4	6	['JovanGerb', 'eric-wieser', 'github-actions', 'grunweg']	nobody	387-44075 1 year ago	439-56096 439 days ago	0-18122 5 hours
24243	Timeroot author:Timeroot	feat(Analysis/Calculus/FDeriv): Fderiv on torsors	Experiment to see how this goes for now, see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Upgrade.20.60fderiv.60.20to.20.60AddTorsor.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	539/447	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/RealDeriv.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/NumberTheory/EulerProduct/ExpLog.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,MathlibTest/Recall.lean	37	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	386-27213 1 year ago	unknown	0-0 0 seconds
23593	erdOne author:erdOne	feat(AlgebraicGeometry): the tilde construction is functorial	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	4	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant']	nobody	385-61271 1 year ago	410-64285 410 days ago	0-71091 19 hours
21065	eric-wieser author:eric-wieser	feat: generalize `tangentConeAt.lim_zero` to TVS	... and then adjust the `variable`s down the rest of the file to make use of the generality. There are two key lemmas that this does not generalize, which would probably unlock the rest of the file: * `subset_tangentCone_prod_left` (and `_right`) * `zero_mem_tangentCone` --- - [ ] depends on: #20859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	55/28	Mathlib/Analysis/Calculus/TangentCone.lean	1	16	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	385-53675 1 year ago	453-3350 453 days ago	23-20072 23 days
22721	grunweg author:grunweg	chore(MeasureTheory/Function/LpSeminorm/Basic): generalise more results to enorm classes	Done for the Carleson project. --- - depends on #22708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-measure-probability	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	384-46343 1 year ago	436-32709 436 days ago	0-6 6 seconds
14731	adomani author:adomani	feat: the repeated typeclass assumption linter	[#mathlib4 > recyclable variables @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/recyclable.20variables/near/451167963) also [#mathlib4 > Normed modules @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Normed.20modules/near/512242167) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	178/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DependentTypeclass.lean,MathlibTest/DependentTypeclass.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	383-51582 1 year ago	673-50327 673 days ago	0-109 1 minute
24549	grunweg author:grunweg	feat: define embedded submanifolds, attempt 1	Not meant to be merged (I think a different design is better); opening this so I can find this more easily. --- - [ ] depends on: #23040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	1445/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/LinearAlgebra/Prod.lean	8	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	380-76795 1 year ago	381-59718 381 days ago	0-1 1 second
23921	alreadydone author:alreadydone	Jyxu/projective trace	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	157/123	Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Relrank.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/RingTheory/LocalProperties/Projective.lean	5	1	['leanprover-community-bot-assistant']	nobody	380-76627 1 year ago	unknown	0-0 0 seconds
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory new-contributor label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	380-76451 1 year ago	unknown	0-0 0 seconds
21252	ADedecker author:ADedecker	feat: redefine uniformly convex normed spaces with filters instead of epsilons	And conceptualize some proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	301/87	Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformGroup/Defs.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	6	1	['github-actions']	nobody	380-76366 1 year ago	unknown	0-0 0 seconds
19821	eric-wieser author:eric-wieser	feat: add a Qq version of AtomM that groups by type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP large-import t-meta	332/30	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/AtomM.lean,Mathlib/Util/Qq.lean	6	1	['github-actions']	nobody	380-76179 1 year ago	unknown	0-0 0 seconds
19120	hrmacbeth author:hrmacbeth	feat: stop `ring`/`abel` from seeing algebraic operations inside `let`s	This draft PR illustrates a feature I would like to see in core: a variant of `whnf` which allows particular kinds of reduction, such as zeta-delta reduction, to be turned off. Here it is used to make ring-normalization and abelian-group-normalization a bit more responsive to what (I think) users expect: these normalizations would no longer look inside user-defined lets to see algebraic operations in those expressions. Note: In Lean/Mathlib 3, `ring` matched for algebraic operations on an algebraic expression `e` itself, not on `← whnfR e`. So mathlib3 `ring` didn't see algebraic operations inside `let`s -- but it also didn't see algebraic operations requiring beta-reduction (like `(fun t ↦ t + 1) x`) or see inside abbreviations. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/whnf.20variant.20which.20preserves.20let-bindings) Update: fortuitously, it looks like the new core PR https://github.com/leanprover/lean4/pull/6053 will provide this feature! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-core-PR t-meta	137/15	Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean,Mathlib/RingTheory/WittVector/DiscreteValuationRing.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/RingNF.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Util/WHNF.lean,MathlibTest/abel.lean,MathlibTest/ring.lean	21	5	['JovanGerb', 'github-actions', 'grunweg', 'hrmacbeth']	nobody	380-76159 1 year ago	unknown	0-0 0 seconds
17069	yuma-mizuno author:yuma-mizuno	chore(CategoryTheory/Functor/Basic): put `simp` at `Functor.id_comp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	41/30	Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/GuitartExact/VerticalComposition.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Shift/CommShift.lean	5	3	['github-actions', 'leanprover-bot', 'yuma-mizuno']	nobody	380-76149 1 year ago	unknown	0-0 0 seconds
14803	StevenClontz author:StevenClontz	chore: use `Disjoint` nhd filters for all separation axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	157/122	Mathlib/Topology/Separation.lean	1	1	['github-actions']	nobody	380-76133 1 year ago	unknown	0-0 0 seconds
14675	adomani author:adomani	dev: the repeated variable linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	380-76128 1 year ago	675-62682 675 days ago	0-8 8 seconds
14330	Ruben-VandeVelde author:Ruben-VandeVelde	chore: split Mathlib.Algebra.Star.Basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	446/331	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Star.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Defs.lean,Mathlib/Algebra/Star/Lemmas.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Rat.lean,Mathlib/Algebra/Star/Regular.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Data/Complex/Basic.lean,scripts/noshake.json	15	3	['github-actions', 'grunweg', 'j-loreaux']	nobody	380-76088 1 year ago	686-6033 686 days ago	0-45204 12 hours
14007	adomani author:adomani	test: papercut linter working on all mathlib	This PR is a testing ground for potential issues with the papercut linter #13999. It is not intended to be merged. The linter is active on all of mathlib, to make sure that the linter does not throw errors, but only emits warnings! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter	249/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Papercut.lean,test/Papercut.lean	5	1	['github-actions']	nobody	380-75973 1 year ago	unknown	0-0 0 seconds
20354	eric-wieser author:eric-wieser	feat: generalize `ContinuousLinearMap.curry` to TVS	Follow on from #10777 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	57/25	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	380-75908 1 year ago	unknown	0-0 0 seconds
8511	eric-wieser author:eric-wieser	refactor(MeasureTheory/Measure/Haar/Basic): partially generalize to the affine case	Without a `Mul` version of `AddTorsor`, this generalization can only go so far. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	380-75719 1 year ago	911-47399 911 days ago	0-7 7 seconds
7994	ericrbg author:ericrbg	chore: generalize `LieSubalgebra.mem_map_submodule`	--- Not sure if we should rename to something like `mem_map_iff_mem_map_submodule` or not. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-algebra label:t-algebra$	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	380-75707 1 year ago	933-70702 933 days ago	0-1 1 second
6317	eric-wieser author:eric-wieser	refactor(Data/Finsupp/Defs): make Finsupp.single defeq to Pi.single	By adding a `DecidableEq ι` argument to `Finsupp.single`, we remove the reference to `Classical.decEq ι` in the definition, which in turn means that when coerced to a function it is now defeq to `Pi.single`. This also brings it in line with `DFinsupp.single`. This does not go as far as making `Finsupp.single` computable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	269/226	Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/Finsupp.lean	12	0	[]	nobody	380-75701 1 year ago	unknown	0-0 0 seconds
6277	jjaassoonn author:jjaassoonn	Dimension theory	Some results are - The ring Krull dimension and the topological dimension of the prime spectrum of a ring are the same - A field is zero-dimensional and a PID that is not a field is one dimensional - An Artinian ring is zero-dimensional - The Krull dimension of ring $R$ is equal to the supremum of heights of maximal ideals [00KG](https://stacks.math.columbia.edu/tag/00KG) - two definitions of module length agree - A module is finite length iff both artinian and noetherian - length of module $M$ is equal to the sum of length of $N$ and length of $M / N$ where $N$ is a submodule of $M$. - Noetherian ring has only finitely many minimal primes #9088 - In a zero dimensional ring, prime ideals are maximal - Artinian rings has finitely many maximal ideals #9087 - zero-dimensional rings with finitely many prime ideals are products of its localizations: $R \cong \prod_{\mathfrak{p}}R_{\mathfrak{p}}$ - Let $M_0 \le ... \le M_n$, then $l(M_n/ M_0) = l(M_1/M_0) + l(M_2/M_1) + ... + l(M_n/M_{n-1})$ where $l$ denotes module length. - If $f : R \to S$ is a ring homomorphism and $M$ an $S$-module, then $l_R(M) \le l_S(M)$, when $f$ is surjective then they are equal. (Note that this is expressed using `[Algebra R S]` and `RestrictScalars R S M`, instead of a literal ring hom) - Artinian rings are noetherian ring of dimension 0. - For 0-dimensional local ring, its maximal ideal is locally nilpotent - In notherian ring, $I \le \sqrt{J}$ implies $I ^ n \le J$ for some $n$ --- - [x] depends on: #6309 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	3289/459	Mathlib.lean,Mathlib/Algebra/Module/Length.lean,Mathlib/Algebra/Module/Submodule/JordanHolder.lean,Mathlib/Algebra/PUnitInstances.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/ArtinianAndNoetherian.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Nodup.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/Order/Cover.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/ListOnPartialOrderTypes.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Pi.lean,Mathlib/RingTheory/KrullDimension.lean,Mathlib/RingTheory/Noetherian.lean,Mathlib/RingTheory/SimpleModule.lean,Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sheaves/SheafCondition/EqualizerProducts.lean	24	11	['alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	380-75696 1 year ago	unknown	0-0 0 seconds
8536	jjaassoonn author:jjaassoonn	characteristic predicate of tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	399/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/IsTensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	4	12	['alreadydone', 'eric-wieser', 'jjaassoonn']	nobody	380-75649 1 year ago	unknown	0-0 0 seconds
11524	mcdoll author:mcdoll	refactor: Introduce type-class for SchwartzMap	--- There are a lot of other refactors to do (`seminormAux` should have a nicer name and gobble up more theorems from `seminorm`), then one can prove `integrable` and friends with only `SchwartzMapClass`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	380-75615 1 year ago	unknown	0-0 0 seconds
11003	thorimur author:thorimur	chore: migrate to `tfae` block tactic	Migrates to the `tfae` block tactic syntax, eliminating uses of `tfae_have` and `tfae_finish`. --- - [ ] depends on: #11000 - [ ] depends on: #10991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR t-meta	1267/1081	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/FieldTheory/Galois.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Height.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Tactic/TFAE.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Category/CompHaus/EffectiveEpi.lean,Mathlib/Topology/Category/Profinite/EffectiveEpi.lean,Mathlib/Topology/Category/Stonean/EffectiveEpi.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyClosed.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order/LeftRightNhds.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,scripts/noshake.json,test/tfae.lean	42	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	380-75611 1 year ago	609-36984 609 days ago	3-60883 3 days
9819	jjaassoonn author:jjaassoonn	fg graded ring	1. if $A$ is a noetherian graded ring, then $A_0$ is a noetherian subring of $A$ and $A$ is a finitely generated algebra over $A_0$, if $M$ is a finitely generated graded module over $A$, then each $M_n$ is a finitely generated module over $A_0$. 2. Definition of additive functions over any abelian category: if $C$ is an abelian category, a function $f : C \to \mathbb Z$ is said to be additive, if $f(y) = f(x) + f(z)$ whenever $0\to x \to y \to z \to 0$ is exact. proved some basic properties such as $f(0) = 0$ and $f(x) = f(y)$ whenever $x \cong y$ and interaction of $f$ with longer exact sequences 3. The category of finitely generated module over noetherian ring is abelian 4. A proof of Hilbert-Serre theorem: the Poincare series is actually of the form $\frac{p}{\prod(1- X^i)}$ where $p$ is polynomial The code works, but poorly written. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	6745/217	Mathlib.lean,Mathlib/Algebra/Category/FGModuleCat/Abelian.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/EpiMono.lean,Mathlib/Algebra/Category/FGModuleCat/Kernels.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/HilbertSerre/AdditiveFunction.lean,Mathlib/Algebra/HilbertSerre/FiniteInstances.lean,Mathlib/Algebra/HilbertSerre/HilbertPolynomial.lean,Mathlib/Algebra/HilbertSerre/Theorem.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/GradedAlgebra/Subgrading.lean,Mathlib/RingTheory/Polynomial/Hilbert.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/WellKnown.lean	25	2	['FMLJohn', 'github-actions']	nobody	380-75597 1 year ago	unknown	0-0 0 seconds
14348	eric-wieser author:eric-wieser	perf: disable the `unusedVariables` linter for speed	I doubt we want to merge this, but it shaves two minutes of the lint time. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	performance-hack	1/0	lakefile.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	380-75481 1 year ago	unknown	0-0 0 seconds
13543	adomani author:adomani	test: automatically undeprecate	A test for `update_deprecations`. There are two files with deprecated declarations, but CI automatically fixes them, so that they pass the noisy tests (as well as passing fail-on-warning `lake build`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter	345/4	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,Mathlib/test_depr.lean,Mathlib/test_depr_no_change.lean,lakefile.lean,scripts/update_deprecations.lean,test/UpdateDeprecations.lean	12	0	[]	nobody	380-75448 1 year ago	unknown	0-0 0 seconds
14932	eric-wieser author:eric-wieser	chore: add nndist versions of lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	108/1	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean	2	1	['github-actions']	nobody	380-75261 1 year ago	unknown	0-0 0 seconds
18202	ADedecker author:ADedecker	chore: refactor algebraic filter bases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	1086/1315	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Operator/WeakOperatorTopology.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/UniformConvergence.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/UniformFilterBasis.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean	14	1	['github-actions']	nobody	379-67932 1 year ago	unknown	0-0 0 seconds
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-topology FLT	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	10	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	379-59265 1 year ago	386-1417 386 days ago	55-70108 55 days
15161	adomani author:adomani	feat(Linter): flag `intros x y` which can be replaced by `intro x y`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-linter	78/1	Mathlib/Tactic/Linter/Lint.lean,test/Lint.lean	2	4	['adomani', 'github-actions', 'grunweg']	nobody	379-30340 1 year ago	unknown	0-0 0 seconds
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-computability merge-conflict awaiting-zulip	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	378-22730 1 year ago	647-45915 647 days ago	0-179 2 minutes
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	377-24691 1 year ago	454-49714 454 days ago	43-80684 43 days
19464	adomani author:adomani	test: removed merge-conflict	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP CI delegated	22/1	.github/workflows/PR_summary.yml,scripts/zulip_emoji_merge_delegate.py	2	10	['adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	376-36015 1 year ago	unknown	0-0 0 seconds
24155	eric-wieser author:eric-wieser	feat: add a "rw_proc" for fin vectors	This seems a little nicer than an elaborator, since it means I can use the default elaboration rules to handle my first few variables. Ideally there would be something like ```lean rw_procQ {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A : Q(Type u) B : Q($A -> Type v) a : Q($A) b : Q($B $a) rhs : Q($B $a) -- metavariable to assign \|- MetaM Q($b = ?rhs) -/ ``` or ```lean rw_proc {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A B a b : Expr rhs : MVarId \|- MetaM Expr -/ ``` which would generate the code I wrote here --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author RFC t-data t-meta	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	2	['github-actions', 'urkud']	nobody	375-20571 1 year ago	375-20571 375 days ago	20-83091 20 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-logic	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	374-42765 1 year ago	374-42765 374 days ago	46-55730 46 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-author new-contributor	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	372-68309 1 year ago	372-68309 372 days ago	27-52316 27 days
24642	grunweg author:grunweg	WIP-feat: add layercake formula for ENNReal-valued functions	Not much to see here yet; some significant amount of work remains. --- - [ ] depends on: #24643 - [ ] depends on: #24640 (based on that PR for simplicity) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-analysis	189/24	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Integral/Layercake.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	371-44690 1 year ago	unknown	0-0 0 seconds
21712	grunweg author:grunweg	chore: generalise more lemmas to `ContinuousENorm`	--- - [x] depends on: #21781 (minor drive-by clean-up) - [x] depends on: #21670 - [x] depends on: #22708 (extracted from this) - some parts depend on #21433 (or better: #22175); when the dependent PR has landed, I will re-assess whether to split these into a separate PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict carleson awaiting-CI t-measure-probability	76/31	Mathlib/Analysis/Normed/MulAction.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean	4	5	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	370-66374 1 year ago	unknown	0-0 0 seconds
21375	grunweg author:grunweg	WIP: generalise lemmas to ENorm	This work is part of (and a necessary pre-requisite for) the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI t-measure-probability carleson merge-conflict	471/221	Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/Probability/Independence/Integrable.lean	13	2	['fpvandoorn', 'grunweg']	nobody	370-60749 1 year ago	unknown	0-0 0 seconds
24378	urkud author:urkud	feat(Algebra/Order/Field/Basic): generalize lemmas	... from linear ordered semifields to (commutative) groups with zero. --- I'm going to do another round of generalizing today or tomorrow, so making it a draft PR for now. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	183/181	Archive/OxfordInvariants/Summer2021/Week3P1.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/StrictConvexSpace.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/SmoothTransition.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Cardinality.lean,Mathlib/Data/Real/Pi/Wallis.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/SeparableMeasure.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleNumber.lean,Mathlib/Order/Filter/AtTopBot/Floor.lean,Mathlib/Order/Interval/Set/IsoIoo.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/Topology/ContinuousMap/Polynomial.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/UrysohnsLemma.lean	72	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	370-45079 1 year ago	388-1631 388 days ago	0-14 14 seconds
24618	b-mehta author:b-mehta	feat(Analysis): add Schur inequality and variants	Add Schur inequality and some of its common variants. TODO: - [x] add reference to source: https://www.cip.ifi.lmu.de/~grinberg/VornicuS.pdf - [ ] add other generalisations - [ ] move some of the lemmas elsewhere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	145/0	Mathlib/Analysis/Convex/Schur.lean	1	16	['b-mehta', 'eric-wieser', 'github-actions']	nobody	369-55842 1 year ago	378-35844 378 days ago	0-2 2 seconds
15115	kkytola author:kkytola	feat: Generalize assumptions in liminf and limsup results in ENNReals	In a [review comment](https://github.com/leanprover-community/mathlib4/pull/13938#discussion_r1649744441) it was pointed out that results about liminf and limsup in ENNReal hold under milder assumptions. This PR does the generalization. --- This PR is split off from #13938, where the review comment was made. The changes needed for the suggested generalization were of different kind than the simple PR's content, justifying a separate PR. - [x] depends on: #13938 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict help-wanted awaiting-author t-topology	215/27	Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean	3	8	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot']	nobody	368-57084 1 year ago	614-49902 614 days ago	21-25493 21 days
24957	eric-wieser author:eric-wieser	feat: use ` binderNameHint` in sum_congr	Zulip thread: [#new members > Choosing dummy variable inside summation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Choosing.20dummy.20variable.20inside.20summation/near/518492888) Co-authored-by: Joachim Breitner --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	23/16	Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/Multiset/Count.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Sym2.lean	13	2	['github-actions', 'mathlib-merge-conflicts']	nobody	367-54986 1 year ago	367-56088 367 days ago	0-424 7 minutes
8495	jjaassoonn author:jjaassoonn	feat : Tensor-Hom adjunction in the category of modules	# Tensor-Hom adjunction Let $R$ be a commutative ring and $S$ any ring. Let $X$ be an $(S,R)$-bimoule. Then the tensor functor $(X \otimes_R \cdot)$ is a functor from left $R$-modules to left $S$-modules; and the hom-functor $Hom_S(X, \cdot)$ is a functor from left $S$-modules to left $R$-modules. For another left $S$-module $Y$, the left $R$-module structure of $Hom_S(X, Y)$ is given by $s \cdot f := x \mapsto f(s \cdot x)$. These two functors are adjoint.. In particular we have that ```math {\rm Hom}_{S}(X\otimes_R Y, Z) \cong {\rm Hom}_R (Y, {\rm Hom}_S (X, Z)) ``` ## Implementation notes 1. Why not use the `Mathlib/LinearAlgebra/TensorProduct/Tower.lean` In our setting `X` is an `(R, S)` bimodule and `Y` an `R`-module and `Z` an `S`-module so to use the `Tower` file, we need `S` to be an `R`-algebra which is a luxury we do not have. But note that in `Tower` file, `curry` and `uncurry` are both tri-linear maps. So `Tower` file allows interplay of 3 rings which is not allowed in this file. 2. We require `R` to be commutative but we never used anything commutative. This is because of tensor product requires commutativity, but thanks to @alreadydone, this assumption could be removed soon. I think this PR should wait for Junyan's attempt on removing commutativity, so it is marked as draft and wip for now --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-algebra label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorHomAdjunction.lean	2	88	['alreadydone', 'bustercopley', 'eric-wieser', 'github-actions', 'jjaassoonn', 'kbuzzard', 'kim-em', 'leanprover-community-bot-assistant']	eric-wieser assignee:eric-wieser	366-51620 1 year ago	910-75975 910 days ago	1-57685 1 day
19284	adomani author:adomani	test: commit a change only to the "master" CI build action	This PR should fail CI, since the main CI build file is incompatible with the autogenerated ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	3/3	.github/build.in.yml,.github/workflows/actionlint.yml	2	12	['adomani', 'bryangingechen', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	364-83024 11 months ago	483-56812 483 days ago	61-913 61 days
15254	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Monoidal): replace `Mon_` lemmas with `Mon_Class` lemmas	We redefine algebras internal to monoidal categories, which were defined by full-bundled structures, in terms of semi-bundled type classes. The original full-bundled structure `X` is renamed to `X_Cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	3982/96	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Bimod_Class.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class copy.lean,Mathlib/CategoryTheory/Monoidal/Bimon_Class.lean,Mathlib/CategoryTheory/Monoidal/Braided/Opposite.lean,Mathlib/CategoryTheory/Monoidal/CommMon_Class.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_Class.lean,Mathlib/CategoryTheory/Monoidal/Internal/ModuleClass.lean,Mathlib/CategoryTheory/Monoidal/Mod_Class.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Mon_Class.lean,Mathlib/CategoryTheory/Monoidal/mwe.lean	14	6	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'yuma-mizuno']	nobody	361-22195 11 months ago	unknown	0-0 0 seconds
23489	plp127 author:plp127	chore: fix recursors	Replace motive with `motive` and other improvements. Will probably split this PR after fixing is done. 4013 recursors left --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4255/172	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/BubbleSortInduction.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Option.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/PFun.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/Order/DirectedInverseSystem.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/PGame/Algebra.lean,done.csv,print.lean,working.csv	42	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	358-52913 11 months ago	unknown	0-0 0 seconds
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import new-contributor	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	356-40650 11 months ago	356-40652 356 days ago	35-30364 35 days
12438	jjaassoonn author:jjaassoonn	feat: some APIs for flat modules	Need horseshoe lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	1674/3	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Exact.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Horseshoe.lean,Mathlib/CategoryTheory/Abelian/LeftDerived.lean,Mathlib/RingTheory/Flat/Basic.lean	8	21	['erdOne', 'github-actions', 'jjaassoonn', 'joelriou']	nobody	351-53276 11 months ago	753-16147 753 days ago	0-20 20 seconds
17715	adomani author:adomani	feat: the unusedVariableCommand linter	This is still work-in-progress, but also help-wanted! The linter reliably flags unused variables: so far, only `example`s fool it (and that is simply because I did not implement a fix, as there are very few `variable`s that are only used in `example`s in mathlib). The work-in-progress part refers to the fact that the linter uses an `IO.Ref` to keep track of variables and this does not work well with editing the file. The linter works on a fresh parse of a file, but becomes out-of-sync with every edit. The help-wanted is to ask for help to make mathlib compliant with the linter, by checking out this branch and PR-ing a few variable removals! [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Unused.20variables) --- Known issues: * automatic namespacing and `nonrec` may cause difficulty when the newly introduced declaration is preferred in the term, rather than the original one (see examples here ```bash code -r -g ././././Mathlib/Analysis/SpecialFunctions/Arsinh.lean:183 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 ``` where, for instance, `ContinuousOn.arsinh` is used internally instead of `Real.arsinh`). * `mutual` declarations confuse the linter ```bash code -r -g ././././Mathlib/SetTheory/Lists.lean:313 ``` * `code -r -g Mathlib/CategoryTheory/EffectiveEpi/Comp.lean:133:29` * universe annotations confuse the linter: ```bash code -r -g ././././Mathlib/Topology/Category/CompactlyGenerated.lean:53 code -r -g ././././Mathlib/AlgebraicTopology/CechNerve.lean:46 ``` * `inductive`s confusing the linter ```bash code -r -g ././././Mathlib/Deprecated/Subgroup.lean:389 code -r -g ././././Mathlib/FieldTheory/PerfectClosure.lean:55 ``` * `def`s confusing the linter ```bash code -r -g ././././Mathlib/Data/MLList/BestFirst.lean:104 ``` * special typeclass assumptions ```code code -r -g ././././Mathlib/RingTheory/WittVector/Truncated.lean:273 code -r -g ././././Mathlib/Topology/Category/Profinite/Product.lean:79 ``` * not sure what is going on here: ```bash code -r -g ././././Mathlib/RingTheory/WittVector/IsPoly.lean:95 code -r -g ././././Mathlib/Probability/Independence/Basic.lean:368 code -r -g ././././Mathlib/Analysis/Calculus/FDeriv/Star.lean:30 ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter large-import	695/22	Mathlib.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Int/Cast/Field.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BoundedOrder/Monotone.lean,Mathlib/Order/Monotone/Monovary.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedVariableCommand.lean,MathlibTest/UnusedVariableCommand.lean,lakefile.lean	17	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	349-48034 11 months ago	582-13067 582 days ago	0-92 1 minute
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	347-57217 11 months ago	347-58108 347 days ago	0-10326 2 hours
16020	adomani author:adomani	feat: compare PR `olean`s size with `master`	Adds two CI steps: * `print the sizes of the oleans` that prints the sizes of all the folders containing `Mathlib` `.olean`s; * `compare oleans` that compares the sizes of the previous step with the corresponding sizes on `master`. In the test runs, the two steps have taken at most 3 seconds combined (the first is virtually instantaneous, the second one depends on `curl` to find a job id and on `gh` to retrieve the logs of a previous CI run -- everything else appears to be negligible). This hopefully helps finding out if some PR is bloating up the `.olean`s. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Error.3A.20No.20space.20left.20on.20device/near/463792355) for a PR of mine that prompted this check. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	50	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	347-4257 11 months ago	544-51679 544 days ago	87-65841 87 days
16062	adomani author:adomani	Test/ci olean size	Tests for oleans --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author CI	114/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	4	['Parcly-Taxel', 'adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	347-4257 11 months ago	634-65237 634 days ago	0-16 16 seconds
25507	eric-wieser author:eric-wieser	chore(RingTheory/Valuation): golf using `Con`	This has no particular motivation besides seeing if `Con` is a performant substitute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	20/35	Mathlib/RingTheory/Valuation/ValuationRing.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	346-82136 11 months ago	unknown	0-0 0 seconds
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-algebra new-contributor merge-conflict awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	346-12603 11 months ago	729-40256 729 days ago	9-22045 9 days
23709	plp127 author:plp127	feat: `Nat.findFrom`	This PR adds `Nat.findFrom`, which is like `Nat.find`, but starting from an arbitrary `k` instead of `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	190/47	Mathlib/Data/Nat/Find.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	345-64292 11 months ago	408-30065 408 days ago	0-943 15 minutes
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-convex-geometry	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	345-63477 11 months ago	345-63479 345 days ago	6-38644 6 days
21734	adomani author:adomani	fix(PR summary): checkout GITHUB_SHA	This should make the version of the script that is used on PRs more stable. Suggested by Eric Wieser on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/messageFile.2Emd/near/498941855). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author CI	2/1	.github/workflows/PR_summary.yml	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	344-80144 11 months ago	461-30023 461 days ago	0-6023 1 hour
25579	JovanGerb author:JovanGerb	feat(Order/Notation): only allow ⊔/⊓ for non-linear orders	⊔/⊓ is the same as max/min. The difference is that it is meant to be used if and only if there is no linear order. This PR implements a check for one of the two directions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	33/7	Mathlib/Order/Notation.lean	1	1	['github-actions']	nobody	344-65440 11 months ago	345-8044 345 days ago	0-8 8 seconds
8949	sebzim4500 author:sebzim4500	Add `by_approx` tactic for proving real inequalities using rational approximation	feat: Add `by_approx` tactic for proving real inequalities by finding rational approximations --- ```lean example : \|sqrt 2 - 1.414\| < 0.001 := by by_approx ``` This is a work in progress, the code is messy and the tactic is often very slow. It also depends on some other PRs that haven't been merged yet. It currently supports basic operations (`+`, `-`, `*`, `/`, `abs`) and has approximation extensions for `sqrt` and `exp`. - [ ] depends on: #8167 - [x] depends on: #8832 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict modifies-tactic-syntax t-meta	1670/3	Mathlib.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ByApprox.lean,Mathlib/Tactic/ByApprox/Basic.lean,Mathlib/Tactic/ByApprox/Core.lean,Mathlib/Tactic/ByApprox/Exp.lean,Mathlib/Tactic/ByApprox/Lemmas.lean,Mathlib/Tactic/ByApprox/Test.lean,Mathlib/Tactic/ByApprox/Util.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRW.lean,Mathlib/Tactic/GRW/Core.lean,Mathlib/Tactic/GRW/Lemmas.lean,Mathlib/Tactic/NormNum/NatFactorial.lean,test/ByApprox.lean,test/GRW.lean,test/norm_num_ext.lean	18	1	['mathlib4-dependent-issues-bot']	nobody	341-17791 11 months ago	unknown	0-0 0 seconds
20334	miguelmarco author:miguelmarco	feat: allow polyrith to use a local Singular/Sage install	Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-meta	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	339-5156 11 months ago	477-43137 477 days ago	27-61498 27 days
25911	BoltonBailey author:BoltonBailey	make `a / b` simp normal form	This PR continues the work from #25631. Original PR: https://github.com/leanprover-community/mathlib4/pull/25631	t-algebra label:t-algebra$	11/1	Mathlib/Algebra/Group/Defs.lean	1	2	['BoltonBailey', 'github-actions']	nobody	337-48905 11 months ago	unknown	0-0 0 seconds
25912	BoltonBailey author:BoltonBailey	feat: add simp lemmas for trig functions on `π * 2⁻¹`	This PR adds a number of simp lemmas to reduce trig functions evaluated on `π * 2⁻¹`. This allows `simp` to reduce expressions such as `sin (π * (1 / 2))` --- - [ ] depends on: #25911 [experiment with simp normal form] Original PR: #24213	awaiting-author blocked-by-other-PR t-analysis	45/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	3	['BoltonBailey', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	337-47618 11 months ago	337-48315 337 days ago	0-136 2 minutes
25918	BoltonBailey author:BoltonBailey	feat: one time pad string diagram	This PR continues the work from #10655. Original PR: https://github.com/leanprover-community/mathlib4/pull/10655		159/0	MathlibTest/StringDiagram.lean	1	2	['BoltonBailey', 'github-actions']	nobody	337-47049 11 months ago	unknown	0-0 0 seconds
23953	b-reinke author:b-reinke	feat(Data/Matroid/Tutte): define the Tutte polynomial of a matroid	This PR defines the Tutte polynomial of a matroid and shows basic properties. - [x] depends on: #23926 - [ ] depends on #24336 - [ ] depends on: #23951 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	111/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Matroid/Tutte/Basic.lean,Mathlib/Data/Set/Image.lean	3	7	['apnelson1', 'b-reinke', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	336-46636 11 months ago	unknown	0-0 0 seconds
25921	BoltonBailey author:BoltonBailey	feat: scripts to analyze overlap between namespaces	This PR continues the work from #11385. Original PR: https://github.com/leanprover-community/mathlib4/pull/11385	WIP migrated-from-branch t-meta	86/0	scripts/RecordNamespaces.lean,scripts/namespace-overlap.py	2	1	['github-actions']	nobody	335-34916 11 months ago	335-34932 335 days ago	2-11832 2 days
18771	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): exterior powers of free modules are free	Co-authored-by: sophie.morel@ens-lyon.fr --- - [ ] depends on: #18662 - [x] depends on: #18534 - [x] depends on: #18651 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	1185/160	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/ExteriorPower/Pairing.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorPower/Pairing.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	19	3	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-69773 10 months ago	unknown	0-0 0 seconds
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	847/159	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	3	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55218 10 months ago	565-53117 565 days ago	0-679 11 minutes
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	699/21	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55216 10 months ago	565-54760 565 days ago	0-619 10 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	771/168	Mathlib.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	5	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55215 10 months ago	565-55402 565 days ago	0-638 10 minutes
26239	BoltonBailey author:BoltonBailey	feat: add sample pre-commit git hook file	This PR adds a sample pre-commit git hook file that runs `mk_all` and `lint-style`. The script provides instructions on how to activate these as git hooks. Installing these would be optional, but hopefully people who would install them would find it easier to avoid commits that immediately fail linters. Discussion of hooks on [Zulip here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Automatic.20setup.20and.20distribution.20of.20git.20hooks/with/525103090). Some thoughts: - Perhaps it would be better, for speed, to attempt to avoid certain commands if the staged changes suggest they would be unnecessary. - i.e. only run linters on files that have been updated / only run `mk_all` if a file has been added or deleted. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	18/0	git_hooks/pre-commit	1	1	['github-actions']	nobody	332-26749 10 months ago	332-26749 332 days ago	0-1331 22 minutes
13964	pechersky author:pechersky	feat(Data/DigitExpansion): begin defining variant of reals without rationals	Based on a de Bruijn 1976 paper. This file is just the basic definition of a digit expansion. Will be followed up with further constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	330-37506 10 months ago	568-63722 568 days ago	129-57999 129 days
21450	eric-wieser author:eric-wieser	feat: improve trace nodes for `positivity`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	25/7	Mathlib/Tactic/Positivity/Core.lean	1	1	['github-actions']	nobody	330-23528 10 months ago	unknown	0-0 0 seconds
26327	eric-wieser author:eric-wieser	chore: split the tests for positivity	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		528/2	MathlibTest/Positivity/basic.lean,MathlibTest/positivity.lean	2	1	['github-actions']	nobody	329-21545 10 months ago	unknown	0-0 0 seconds
18662	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): generators of the exterior powers	--- - [x] depends on: #18534 - [x] depends on: #18590 - [ ] depends on: #26464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	818/158	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	325-76228 10 months ago	unknown	0-0 0 seconds
18735	joelriou author:joelriou	feat(Algebra/Module): presentation of the exterior power	Given a presentation of a `R`-module `M`, we obtain a presentation of `⋀[R]^n M`. --- (Still one sorry left.) - [ ] depends on: #18527 - [ ] depends on: #18432 - [ ] depends on: #26464 - [ ] depends on: #18534 - [ ] depends on: #18662 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	1856/157	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	325-72202 10 months ago	unknown	0-0 0 seconds
26581	nomeata author:nomeata	ignore this: Lean pr testing 9124	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1723/1362	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1975Q1.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/DecisionNec.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Cache/Lean.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Epi.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Scalar.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/GrindInstances.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean	567	0	[]	nobody	321-53331 10 months ago	unknown	0-0 0 seconds
15213	adomani author:adomani	dev: add Mathlib.Tactic.Linter.ForallIntro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	608/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/ForallIntro.lean,MathlibTest/ForallIntro.lean	5	5	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	318-5303 10 months ago	unknown	0-0 0 seconds
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	12	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud']	nobody	318-3079 10 months ago	589-37122 589 days ago	0-66650 18 hours
22928	javra author:javra	feat(CategoryTheory): infrastructure for inclusion morphisms into products in categories with 0-morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	52/14	Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-2573 10 months ago	318-2574 318 days ago	112-51866 112 days
22952	eric-wieser author:eric-wieser	refactor: reimplement `RingQuot` in terms of `RingCon.Quotient`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	157/184	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-2572 10 months ago	unknown	0-0 0 seconds
24710	chrisflav author:chrisflav	chore(Data/Set): `tsum` version of `Set.encard_iUnion_of_finite` for non-finite types	As requested here: https://github.com/leanprover-community/mathlib4/pull/23849#discussion_r2081070200 --- - [ ] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	163/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Card/InfiniteArithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Instances/ENat/Lemmas.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	318-2167 10 months ago	318-2167 318 days ago	1-80465 1 day
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	21	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	318-2166 10 months ago	318-2166 318 days ago	37-56728 37 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	35	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	318-1920 10 months ago	318-1921 318 days ago	45-4165 45 days
25197	eric-wieser author:eric-wieser	feat: Finset.sum induction for tensor products.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	81/0	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-1918 10 months ago	unknown	0-0 0 seconds
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry awaiting-zulip new-contributor	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	318-1917 10 months ago	350-63434 350 days ago	6-47693 6 days
25247	alreadydone author:alreadydone	Projective contraction	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	160/31	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-1914 10 months ago	356-25689 356 days ago	0-9 9 seconds
25561	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	179/25	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Grpd.lean	6	6	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	318-1902 10 months ago	334-39625 334 days ago	10-55201 10 days
25671	eric-wieser author:eric-wieser	refactor: generalize `OreSet` to work for bimodules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict large-import	243/256	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/OreLocalization/OreSet.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/TensorProduct/Nontrivial.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-1773 10 months ago	unknown	0-0 0 seconds
25988	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/*): replace Fin 3 with products	This PR continues the work from #24593. Original PR: https://github.com/leanprover-community/mathlib4/pull/24593	merge-conflict t-algebraic-geometry	1000/1022	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	6	3	['Multramate', 'github-actions', 'leanprover-community-bot-assistant']	nobody	318-1608 10 months ago	318-1608 318 days ago	18-21880 18 days
26002	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/Action): action of `Type` on categories with coproducts	We show that if a category admits coproducts of size `w`, then `Type w` acts on the left on that category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	213/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/ChosenTypeCopowers.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-1606 10 months ago	unknown	0-0 0 seconds
26090	grunweg author:grunweg	chore: make `finiteness` a default tactic	Opening for discussion. This PR continues the work from #25119.	merge-conflict	423/366	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Measure/Haar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/BorelCantelli.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Integration.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Disintegration/CondCDF.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Martingale/OptionalStopping.lean,Mathlib/Probability/Moments/CovarianceBilin.lean,Mathlib/Probability/Moments/Tilted.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Probability/UniformOn.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Perfect.lean,scripts/noshake.json	73	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	317-86018 10 months ago	317-86019 317 days ago	16-56825 16 days
26395	winstonyin author:winstonyin	feat: $C^1$ vector fields on compact manifolds define global flows	This PR continues the work from #22254. Original PR: https://github.com/leanprover-community/mathlib4/pull/22254 Any $C^1$ vector field on a compact boundaryless manifold `M` defines a unique global flow `ℝ → M → M`. - [ ] depends on: #26394 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry blocked-by-other-PR merge-conflict	841/406	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/Compact.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	7	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	317-85869 10 months ago	327-83316 327 days ago	0-52 52 seconds
26465	joelriou author:joelriou	feat(Algebra/Module): presentation of the `PiTensorProduct`	Given a presentation of a finite number of `R`-modules `M i`, we obtain a presentation of the module `⨂[R] i, M i`. --- - [ ] depends on: #26464 This PR continues the work from #18527. Original PR: https://github.com/leanprover-community/mathlib4/pull/18527	merge-conflict file-removed t-algebra blocked-by-other-PR label:t-algebra$	525/4	Mathlib.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Set/ComplSingletonLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	10	4	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	317-85739 10 months ago	325-73306 325 days ago	0-1271 21 minutes
26467	joelriou author:joelriou	feat(LinearAlgebra): the tensor product of a finite family of free modules is free	--- - [ ] depends on: #26464 - [ ] depends on: #26465 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR merge-conflict file-removed label:t-algebra$	607/7	Mathlib.lean,Mathlib/Algebra/Module/Presentation/Free.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Set/ComplSingletonLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basis.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	12	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	317-85737 10 months ago	325-69165 325 days ago	0-2 2 seconds
20784	eric-wieser author:eric-wieser	fix: prevent `exact?` recursing forever on `n = 55`	Test case thanks to @llllvvuu: ```lean import Mathlib.SetTheory.Ordinal.Basic theorem natCast_inj {m n : ℕ} : (m : Ordinal) = n ↔ m = n := sorry example (n : Nat) : n = 55 := by exact? ``` This is surely a workaround for some unreported lean bug. The bug still exists for `n = 71` or higher, so we can still track down the bug after merging this patch. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	22/3	Mathlib/SetTheory/Ordinal/Basic.lean,MathlibTest/LibrarySearchRecDepth.lean	2	15	['Command-Master', 'eric-wieser', 'github-actions', 'kbuzzard', 'kim-em', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	317-57002 10 months ago	455-29364 455 days ago	32-73698 32 days
26647	b-mehta author:b-mehta	feat(Data/Sym/Sym2): lift commutative operations to sym2	While we have `Sym2.lift`, it's often useful to lift operations which are known to be commutative to the typeclass system. Indeed, the existing `Sym2.mul` witnesses this already. Thus, this PR can also be seen as generalising `Sym2.mul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	48/28	Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Sym/Sym2/Finsupp.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	4	12	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	316-5198 10 months ago	316-24435 316 days ago	3-71897 3 days
26878	adomani author:adomani	feat: declaration diff script in Lean	Although, it is still text-based, the parsing of the output of `git diff` is now done in Lean. The new script already performed better than the old one in a couple of situations: * #26877 See [this comment](https://github.com/leanprover-community/mathlib4/pull/26847#issuecomment-3045308885) * #26849 See [this comment](https://github.com/leanprover-community/mathlib4/pull/26849#issuecomment-3045092965) --- This is still work in progress: the parsing should be more or less done, but I have not yet hooked this into the action workflow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		497/0	scripts/DeclarationDiff_text_based.lean	1	4	['adomani', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	314-71529 10 months ago	315-35080 315 days ago	0-9 9 seconds
26067	mapehe author:mapehe	feat(Topology/StoneCech): exists_continuous_surjection_from_StoneCech_to_dense_range	This lemma formalises the following version of the maximality property of the Stone–Čech compactification: If `f : α → β` is a continuous map from a topological space `α` to a Hausdorff space `β` with dense range, then there exists a continuous surjection from `StoneCech α` to `β` extending `f`. In particular, `StoneCech α` is the “largest” compact Hausdorff space into which `α` densely embeds, in the sense that any other such space is a continuous image of it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	314-69386 10 months ago	314-69386 314 days ago	20-8582 20 days
25999	bjoernkjoshanssen author:bjoernkjoshanssen	feat(Topology/Compactification): projective line over ℝ is homeomorphic to the one-point compactification of ℝ	This PR continues the work from #18306. Original PR: https://github.com/leanprover-community/mathlib4/pull/18306	merge-conflict t-topology	920/0	Mathlib.lean,Mathlib/Topology/Compactification/OnePointHomeomorph.lean,Mathlib/Topology/Compactification/OnePointRealLemmas.lean	3	3	['bjoernkjoshanssen', 'github-actions', 'leanprover-community-bot-assistant']	nobody	312-75460 10 months ago	314-69388 314 days ago	21-20473 21 days
26994	Paul-Lez author:Paul-Lez	feat(Topology/MetricSpace/Pseudo/Defs): add easy lemma about opens in topological spaces	Split from #26992 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-topology easy	9/0	Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	1	4	['Paul-Lez', 'github-actions', 'grunweg']	nobody	311-50186 10 months ago	311-51608 311 days ago	0-11233 3 hours
21039	eric-wieser author:eric-wieser	hack: override `instance` to insert `fast_instance%`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-meta	40/4	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/FiberBundle/Basic.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	311-32088 10 months ago	unknown	0-0 0 seconds
26911	JovanGerb author:JovanGerb	chore: fix naming of `mono` and `monotone`	The naming convention says: "We use `_mono` for `a ≤ b → f a ≤ f b` and `_anti` for `a ≤ b → f b ≤ f a`, so we also use `_monotone` for `Monotone f`, `_antitone` for `Antitone f`, `_strictMono` for `StrictMono f`, `_strictAnti` for `StrictAnti f`, etc..." This PR swaps `mono`/`anti` and `monotone`/`antitone` where required so that `monotone` refers to `Monotone`, while `mono` refers to a lemma that might be tagged with `@[gcongr]` This PR does not address - `monotone_right`/`mono_right` vs `right_monotone`/`right_mono` - `monotone_arcsin` vs `arcsin_monotone` edit: TODO: `ideal_mono` and friends --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated merge-conflict	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Normed/Order/UpperLower.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Filter/AtTopBot/Defs.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Fin.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/UpperLower/Closure.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean	59	11	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	311-10793 10 months ago	311-51792 311 days ago	2-55296 2 days
25611	erdOne author:erdOne	chore(RingTheory): add `Algebra (FractionRing R) (FractionRing S)`	Co-authored-by: Yakov Pechersky --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	152/108	Mathlib.lean,Mathlib/Algebra/Algebra/NonZeroDivisors.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/FractionRingAlgebra.lean,Mathlib/RingTheory/Localization/Integral.lean	10	20	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky']	nobody	307-58204 10 months ago	341-53890 341 days ago	2-26945 2 days
18230	digama0 author:digama0	feat(Tactic/ScopedNS): extend `scoped[NS]` to more commands	refactor `ScopedNS` to remove error prone repetitiveness and extend it to other commands such as `syntax`, `macro`, `elab`, etc. Co-authored-by: Jon Eugster --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	201/26	Mathlib/Tactic/ScopedNS.lean,MathlibTest/scopedNS.lean	2	7	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'kbuzzard']	nobody	305-64665 10 months ago	448-64170 448 days ago	41-32344 41 days
27330	BoltonBailey author:BoltonBailey	feat(Tactic/Linter): add TacticMs for natural subtraction and division	This is a (pair of) short tactic scripts I wrote for Project Numina while vetting formal formal statements (thanks to [this guide](https://github.com/mirefek/lean-tactic-programming-guide) for the primer). The scripts check for the presence of natural subtraction and natural division, which can often lead to mistakes. Of course, Mathlib allows natural subtraction freely, so it's not obvious this could be made useful to Mathlib itself. Still, maybe it's of use to some other project, so I'll leave it here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	66/0	Mathlib/Tactic/Linter/TruncatedNat.lean	1	2	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	301-8790 9 months ago	unknown	0-0 0 seconds
25284	alreadydone author:alreadydone	feat(LinearAlgebra/Contraction): bijectivity of `dualTensorHom` + generalize to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	167/32	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	5	16	['alreadydone', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	300-22744 9 months ago	306-74911 306 days ago	45-36570 45 days
22749	joelriou author:joelriou	feat(CategoryTheory/Abelian): the Gabriel-Popescu theorem as a localization with respect to a Serre class	This PR introduces a structure `GabrielPopescuPackage C` which contains the information to say that the abelian category `C` is a localization of a category of modules with respect to a suitable Serre class. --- - [x] depends on: #26033 - [ ] depends on: #26663 - [x] depends on: #22733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	202/6	Mathlib.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Bousfield.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	299-66030 9 months ago	319-51831 319 days ago	0-10614 2 hours
26784	eric-wieser author:eric-wieser	chore: remove suppress_compilation	Still not exhaustive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	0/37	Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Mul.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/CategoryTheory/Abelian/Projective/Resolution.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean	18	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	299-38291 9 months ago	unknown	0-0 0 seconds
26987	joelriou author:joelriou	chore: deprecating module LinearAlgebra.PiTensorProduct	--- - [ ] depends on: #26464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	1209/934	Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	10	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	298-67043 9 months ago	311-68809 311 days ago	0-2 2 seconds
27435	callesonne author:callesonne	feat(Normed/Algebra/Logarithm): add FormalMultilinearSeries of logarithm around `1`	This PR adds the `FormalMultilinearSeries` corresponding to `log` around `1` (or rather, corresponding to `log(1 + x)`. For now, this PR just adds the definition, and copies over as many (easy) results as possible from the corresponding exponential file. In a follow up PR, we will add a criterion for when the logarithm converges on the unit disk (based on the growth of the inverse norms of naturals in the given algebra), and show that this holds for any Q_p algebra. This work has been done as part of the workshop "Formalizing Class Field Theory" in Oxford. Since much of this is copy-pasting the Exponential file, I have kept Anatole Dedecker and Eric Wieser as coauthors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	311/0	Mathlib/Analysis/Normed/Algebra/Logarithm.lean	1	1	['github-actions']	nobody	298-45898 9 months ago	298-46236 298 days ago	0-29 29 seconds
24668	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra): add inductive principle for the free product of algebras	* Add `FreeProduct.inductionOn` and `.asPowers.inductionOn`. - [ ] depends on: #24532 --- * `simp↓` on `empty_rel'_bot`: the LHS is indeed not in simp-normal form, but `simp` can't solve the full lemma (if only because `Function.onFun` isn't marked `@[simp]`) and the actual simp-normal form of `rel'` isn't terribly useful for humans. Since I do expect users to type `rel' R A` by hand, I claim this use of `simp↓` is justified. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	205/9	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	297-10212 9 months ago	376-22421 376 days ago	0-229 3 minutes
13973	digama0 author:digama0	feat: lake exe refactor, initial framework	This is the initial framework code for `lake exe refactor`. To use it, you add your refactoring to `Refactor/Main.lean` (note, you have to actually write some metaprogramming code here for the refactoring itself), and the harness will run it on specified files and apply the generated edits. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	139/0	Refactor/Main.lean,lakefile.lean	2	11	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	293-50203 9 months ago	642-53656 642 days ago	6-30547 6 days
12181	adomani author:adomani	lint also `let` vs `have`	This PR is symmetrical to #12157: here we lint for non-`Type`-valued `let`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter	797/544	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Homology/HomologicalComplexBiprod.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/ShortComplex/Abelian.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/Homology/ShortComplex/Linear.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/QuasiIso.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Killing.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Submodule/Localization.lean,Mathlib/Algebra/Module/Zlattice.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/NormedSpace/ContinuousAffineMap.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Abelian/Transfer.lean,Mathlib/CategoryTheory/Adhesive.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/EffectiveEpi/Extensive.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Functor/EpiMono.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/GradedObject/Trifunctor.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Constructions/EpiMono.lean,Mathlib/CategoryTheory/Limits/Constructions/WeaklyInitial.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/FiniteLimits.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/Localization/Pi.lean,Mathlib/CategoryTheory/Localization/Resolution.lean,Mathlib/CategoryTheory/Monad/Monadicity.lean,Mathlib/CategoryTheory/PUnit.lean,Mathlib/CategoryTheory/Sites/Coherent/CoherentSheaves.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularSheaves.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Sites/Preserves.lean,Mathlib/CategoryTheory/Sites/Pullback.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Triangulated/Pretriangulated.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity.lean	271	0	[]	nobody	291-60519 9 months ago	762-69453 762 days ago	0-8 8 seconds
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP t-category-theory new-contributor merge-conflict	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	291-60457 9 months ago	828-53383 828 days ago	7-63253 7 days
10084	alreadydone author:alreadydone	draft for Van Kampen	The part about the homotopy lifting property for covering maps has been extracted to #22649 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-topology	91/24	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/VanKampen.lean	2	1	['leanprover-community-bot-assistant']	nobody	291-60366 9 months ago	unknown	0-0 0 seconds
25914	eric-wieser author:eric-wieser	feat: add an ext lemma for the opposite category	This powers up `aesop_cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory awaiting-CI	18/56	Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/CategoryTheory/Abelian/Opposite.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/GuitartExact/Opposite.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Functor.lean,Mathlib/Combinatorics/Quiver/Basic.lean	9	7	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	291-58100 9 months ago	337-47516 337 days ago	0-523 8 minutes
20208	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- Alternate version of #14237 generalized to use `IsLocalization` and `IsFractionRing` rather than `Localization.AtPrime` and `FractionRing` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	248/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	291-43343 9 months ago	511-24444 511 days ago	0-21 21 seconds
24260	plp127 author:plp127	feat(Topology): add API for Hereditarily Lindelof spaces	Copies the stuff about Lindelof spaces to Hereditarily Lindelof spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	222/42	Mathlib/Topology/Compactness/Lindelof.lean	1	15	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'urkud']	urkud assignee:urkud	291-12915 9 months ago	362-59955 362 days ago	29-42365 29 days
27181	ADedecker author:ADedecker	chore: more conceptual definition of `ValuativeRel.ValueGroupWithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	685/467	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/NonZeroDivisors.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	291-12904 9 months ago	unknown	0-0 0 seconds
27813	javra author:javra	feat: IMO 2025 Q1	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO WIP	882/0	Archive/Imo/Imo2025Q1.lean	1	1	['github-actions']	nobody	290-61325 9 months ago	290-62523 290 days ago	0-14 14 seconds
27608	RemyDegenne author:RemyDegenne	feat(MeasureTheory): typeclasses for measures with finite moments	WIP because it seems useful for #26291 but I want to investigate more. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-measure-probability	97/17	Mathlib.lean,Mathlib/MeasureTheory/Measure/Typeclasses/FiniteMoments.lean,Mathlib/Probability/Moments/CovarianceBilin.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	290-47780 9 months ago	294-31644 294 days ago	0-1 1 second
20008	FLDutchmann author:FLDutchmann	feat(NumberTheory): Selberg sieve	This PR is a working draft of the full proof of the fundamental theorem of the Selberg sieve. I will create dependent PRs as I clean up the code. This work was used in the first proof of the prime number theorem in PNT+. --- - [x] depends on: #20025 - [x] depends on: #20026 - [x] depends on: #20779 - [x] depends on: #21880 - [ ] depends on: #27702 - [ ] depends on: #27707 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR merge-conflict awaiting-author t-analysis	937/0	Mathlib/NumberTheory/SelbergSieve/Basic.lean,Mathlib/NumberTheory/SelbergSieve/Selberg.lean,docs/references.bib	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	290-45625 9 months ago	unknown	0-0 0 seconds
27050	BoltonBailey author:BoltonBailey	doc(Control/Monad/Cont): add docstrings	Split of #25917. Adds docstrings to this file. Note: this documentation was written by asking Cursor (Claude 3.5 sonnet) to write the docstrings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data LLM-generated	183/0	Mathlib/Control/Monad/Cont.lean	1	9	['BoltonBailey', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	290-5335 9 months ago	309-23018 309 days ago	0-84441 23 hours
27225	eric-wieser author:eric-wieser	refactor(Tactic/Lift): deprecate the third with argument	We already have a number of tactics where the clearing happens all the time, and you have to opt out with `id h`. This also fixes a bug where `lift z to Nat with n hn this_is_unused` would silently ignore `this_is_unused`. --- - [ ] depends on: #27223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta merge-conflict	21/9	Mathlib/Tactic/Lift.lean,MathlibTest/lift.lean	2	9	['JovanGerb', 'adomani', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'vihdzp']	JovanGerb assignee:JovanGerb	289-8826 9 months ago	289-55726 289 days ago	15-64386 15 days
26383	eric-wieser author:eric-wieser	feat: `Real.sin_eq_one_iff` and similar	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	155/101	Mathlib/Algebra/ModEq.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean	5	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	287-67008 9 months ago	unknown	0-0 0 seconds
25991	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve): generalise nonsingular condition	This PR continues the work from #25219. Original PR: https://github.com/leanprover-community/mathlib4/pull/25219	merge-conflict t-algebraic-geometry	2127/1561	Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	15	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	287-66890 9 months ago	318-1607 318 days ago	18-21743 18 days
25986	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/NumberField/Height): define heights on Weierstrass curves	This PR continues the work from #15786. Original PR: https://github.com/leanprover-community/mathlib4/pull/15786	t-algebraic-geometry	650/0	Mathlib/AlgebraicGeometry/EllipticCurve/NumberField/Height.lean	1	2	['Multramate', 'github-actions']	nobody	287-66883 9 months ago	unknown	0-0 0 seconds
25985	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Jacobian): add equivalences between points and explicit WithZero types	This PR continues the work from #14923. Original PR: https://github.com/leanprover-community/mathlib4/pull/14923	merge-conflict t-algebraic-geometry	262/66	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,scripts/style-exceptions.txt	4	1	['Multramate']	nobody	287-66878 9 months ago	336-23696 336 days ago	0-48 48 seconds
25982	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Group): compute range of baseChange	This PR continues the work from #10142. Original PR: https://github.com/leanprover-community/mathlib4/pull/10142	merge-conflict t-algebraic-geometry	421/212	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Weierstrass.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	6	1	['Multramate']	nobody	287-66864 9 months ago	336-23863 336 days ago	0-51 51 seconds
25362	adomani author:adomani	feat: a linter for duplicated `open`	This linter warns when a namespace is repeated. It makes an effort to report only the problematic namespaces, but is not especially robust. The linter has some awareness of the `namespace` command, so ```lean def X.Y := 0 open X namespace X open Y ``` will flag both `namespace X` and `open Y` as problematic, even though it was the `open `X` that became redundant with `namespace X`. However, I will not have much time to devote to polishing this and there are quite a few exception in Mathlib before a better version could be seriously considered for adoption. [#mathlib4 > linter requests @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/linter.20requests/near/520273644) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-linter large-import	191/94	Mathlib.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/GroupWithZero/Pi.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Ineq.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/NatAntidiagonal.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Prime/Basic.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Init.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Pairwise.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ApplyFun.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CongrM.lean,Mathlib/Tactic/Find.lean,Mathlib/Tactic/Lift.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DupOpen.lean,Mathlib/Tactic/NormNum/PowMod.lean,Mathlib/Tactic/Recover.lean,Mathlib/Tactic/ReduceModChar.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/SelectInsertParamsClass.lean,Mathlib/Tactic/Widget/StringDiagram.lean,Mathlib/Topology/CWComplex/Abstract/Basic.lean,Mathlib/Topology/ContinuousMap/Interval.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/PartialSups.lean,Mathlib/Topology/Separation/DisjointCover.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Util/CountHeartbeats.lean,MathlibTest/DupOpen.lean	47	14	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	287-66653 9 months ago	350-60435 350 days ago	0-23 23 seconds
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	287-66648 9 months ago	318-1917 318 days ago	38-26044 38 days
17145	Command-Master author:Command-Master	feat(Archive/Ioi/Ioi2024Q2): a proof of the solution of question 2 from IOI 2024.	--- - [x] depends on: #17189 - [x] depends on: #17190 - [x] depends on: #17191 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP IMO large-import	1013/1	Archive.lean,Archive/Ioi/Ioi2024Q2.lean,Mathlib.lean,Mathlib/Combinatorics/Orbits.lean,Mathlib/Data/List/SplitLengths.lean,Mathlib/Data/List/Transpose.lean,Mathlib/Data/List/Zip.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Data/Vector/Transpose.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Partition/Finpartition.lean	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	287-66608 9 months ago	unknown	0-0 0 seconds
27643	ADedecker author:ADedecker	Ad bdd unif conv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	111/26	Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/UniformConvergence.lean,Mathlib/Topology/Bornology/Absorbs.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	287-45367 9 months ago	unknown	0-0 0 seconds
26385	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): define integral perfectoid rings	This PR continues the work from #22331. Original PR: https://github.com/leanprover-community/mathlib4/pull/22331	merge-conflict WIP t-ring-theory	1081/15	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,Mathlib/RingTheory/Perfectoid/IntergalPerfectoid.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean,docs/references.bib	16	3	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant']	nobody	286-69075 9 months ago	328-7098 328 days ago	0-79 1 minute
22909	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Pure): pure submodules	A submodule `N` of an `R`-module is pure if all maps `S ⊗[R] N → S ⊗[R] M` deduced by base change from the injection of `N` into `M` are injective, for all `R`-algebras `S`. This is expressed by the class `Submodule.IsPure`. For type theoretic reason, the definition of `Submodule.IsPure` only considers algebras `S` in the same universe as `R`, but `Submodule.IsPure.baseChange_injective` establishes the property for all universes. * `Submodule.IsComplemented.isPure` : a complemented submodule is pure. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [ ] depends on: #22908 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory blocked-by-other-PR	592/3	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Pure.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	286-68790 9 months ago	431-19596 431 days ago	0-1047 17 minutes
22908	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Finiteness/Small): tensor product of the system of small submodules	The directed limit of a tensor product for the directed system of small submodules. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory blocked-by-other-PR	624/2	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	286-68742 9 months ago	431-19595 431 days ago	0-3552 59 minutes
22898	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/TensorProduct/DirectLimit/FG): direct limit of finitely generated submodules and tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-ring-theory	399/0	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean	5	9	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'leanprover-community-bot-assistant']	nobody	286-68735 9 months ago	421-14836 421 days ago	10-44390 10 days
20431	erdOne author:erdOne	feat(RingTheory/AdicCompletion): monotonicity of adic-completeness	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	206/16	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Mono.lean,Mathlib/RingTheory/Finiteness/Ideal.lean	7	13	['chrisflav', 'erdOne', 'github-actions']	nobody	286-68691 9 months ago	462-67725 462 days ago	32-78180 32 days
19596	Command-Master author:Command-Master	feat(RingTheory/Valuation/PrimeMultiplicity): define `WithTop ℤ`-valued prime multiplicity on a fraction field	Moves: - `multiplicity_addValuation` -> `AddValuation.multiplicity` - `multiplicity_addValuation_apply` -> `AddValuation.multiplicity_apply` --- - [x] depends on: #19149 - [x] depends on: #18786 - [x] depends on: #19122 - [x] depends on: #18954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory large-import	101/37	Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	3	11	['ChrisHughes24', 'Command-Master', 'Vierkantor', 'faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	286-68676 9 months ago	491-44610 491 days ago	8-2214 8 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	286-68669 9 months ago	539-62262 539 days ago	20-16585 20 days
17246	pechersky author:pechersky	feat(RingTheory/PrimaryDecomposition): PIR of Noetherian under jacobson condition	--- - [x] depends on: #17634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	653/1	Mathlib.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/PrimaryDecomposition.lean,docs/references.bib	8	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	286-68663 9 months ago	548-4156 548 days ago	13-7138 13 days
21474	erdOne author:erdOne	feat(RingTheory): replace `Ring.DimensionLEOne` with `Ring.KrullDimLE`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory large-import	285/170	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/Localization.lean,Mathlib/RingTheory/KrullDimension/Polynomial.lean,Mathlib/RingTheory/KrullDimension/Quotient.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean,Mathlib/RingTheory/Nilpotent/End.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/PID/Quotient.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean	16	1	['github-actions']	nobody	286-68607 9 months ago	467-48644 467 days ago	0-81 1 minute
8195	newell author:newell	feat: add a group presentation of the `DihedralGroup n`	Add group presentation $\< a, b\ \|\ a ^ 2 = 1, b ^ 2 = 1, (a * b) ^ n = 1 \>$ for `DihedralGroup n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-group-theory	206/2	Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean	2	6	['kbuzzard', 'newell']	nobody	286-68406 9 months ago	unknown	0-0 0 seconds
11212	shuxuezhuyi author:shuxuezhuyi	feat(GroupTheory/GroupAction): instance `MulAction (β ⧸ H) α`	We instance this naturally from `MulAction β α` when `H` is a normal subgroup and acts trivially on `α`. We also instance `IsometricSMul (M ⧸ N) X` in this way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-group-theory large-import	53/1	Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean	2	6	['YaelDillies', 'github-actions', 'grunweg', 'urkud']	eric-wieser assignee:eric-wieser	286-68399 9 months ago	499-69738 499 days ago	193-73871 193 days
27886	alreadydone author:alreadydone	feat(Algebra): (Mv)Polynomial.X is irreducible assuming NoZeroDivisors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	178/66	Archive/Examples/Eisenstein.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Domain.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/Eisenstein/Criterion.lean	13	3	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	286-66134 9 months ago	287-72875 287 days ago	0-80025 22 hours
26200	adomani author:adomani	fix: add label when landrun fails	Adds the `permission-denied` label on PRs that get blocked by landrun. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	68/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	286-17601 9 months ago	286-17601 286 days ago	46-52210 46 days
17469	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Presheaf): the presheaf of relative differentials	Given a functor `F : C ⥤ D`, presheaves of commutative rings `S`, `R` and a morphism `φ : S ⟶ F.op ⋙ R`, we show that derivations relative to `φ` are representable by a presheaf of `R`-modules. This is obtained by reducing to the case of absolute differentials. The construction shall allow to deduce the presheaf version of the cokernel sequence $$f^\star \Omega_{Y/S} ⟶ \Omega_{X/S} ⟶ \Omega_{X/Y} ⟶ 0$$ when `f : X ⟶ Y` and `g : Y ⟶ S` are morphisms of schemes. --- - [x] depends on: #17366 - [x] depends on: #19507 - [x] depends on: #17388 - [x] depends on: #16755 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory large-import merge-conflict t-algebraic-geometry	391/10	Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	286-12950 9 months ago	589-56057 589 days ago	0-530 8 minutes
25288	robertmaxton42 author:robertmaxton42	feat(CategoryTheory): generalize `Discrete` to arbitrary morphism levels	Using an unused `let`, add an 'anchor' to the definition of `Discrete`, allowing it to carry a second universe level that is then used to permit discrete categories to live in any `Cat.{v, u}`. (This trick was borrowed from the code of `ULiftHom`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	38/32	Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/IsConnected.lean	3	3	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	286-2309 9 months ago	354-78410 354 days ago	0-15615 4 hours
27709	kckennylau author:kckennylau	chore: fix links	--- See https://github.com/leanprover-community/mathlib4/pull/27545#discussion_r2238206933 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	269/256	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Monovary.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/OperatorNorm.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Meromorphic/IsolatedZeros.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/Abelian/Opposite.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Localization/Equivalence.lean,Mathlib/CategoryTheory/Localization/Trifunctor.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/Sites/Coherent/SheafComparison.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/Quiver/Covering.lean,Mathlib/Combinatorics/Quiver/Path.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Fin/Pigeonhole.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Cast/Basic.lean,Mathlib/Data/Int/Cast/Lemmas.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Int/Range.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Forall2.lean,Mathlib/Data/List/Lattice.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/ProdSigma.lean,Mathlib/Data/List/Sections.lean,Mathlib/Data/List/Sublists.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matroid/Minor/Restrict.lean,Mathlib/Data/Multiset/FinsetOps.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/WithTop.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Rat/Encodable.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Functor.lean,Mathlib/Data/Set/Notation.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Sigma/Lex.lean	157	87	['github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	286-520 9 months ago	292-14161 292 days ago	0-9 9 seconds
10345	newell author:newell	feat(Algebra.Module.Zlattice): Add Voronoi Domain	Adds the definition for a Voronoi Domain in regards to the $\mathbb{Z}$-lattice: $$C := \lbrace\mathbf{w} \in \mathbb{V}^n\ :\ \|\mathbf{w}\| \leq \|\mathbf{w} - \mathbf{v}\|\ \text{for all}\ \mathbf{v} \in \mathbf{L} \rbrace$$ where $\mathbf{L}\$ is the $\mathbb{Z}$-lattice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	17/0	Mathlib/Algebra/Module/Zlattice.lean	1	3	['alreadydone', 'newell']	nobody	285-18408 9 months ago	unknown	0-0 0 seconds
28075	tristan-f-r author:tristan-f-r	chore(Finsupp/Indicator): make non-classical	This was surprising to see on a data-carrying definition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data easy merge-conflict	11/9	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Indicator.lean	2	4	['github-actions', 'mathlib-merge-conflicts', 'ocfnash', 'tristan-f-r']	nobody	283-27233 9 months ago	283-71052 283 days ago	0-85904 23 hours
28168	astrainfinita author:astrainfinita	feat: hensel's lemma for topological rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP t-ring-theory t-topology label:t-algebra$	616/0	Mathlib/RingTheory/Polynomial/Hensel.lean	1	1	['github-actions']	nobody	282-12668 9 months ago	unknown	0-0 0 seconds
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import merge-conflict awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	3	['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	281-72210 9 months ago	482-47025 482 days ago	9-59130 9 days
20267	joelriou author:joelriou	feat(CategoryTheory): comma categories are accessible	--- (I shall probably not work on this PR in the near future.) - [ ] depends on: #19937 - [ ] depends on: #19945 - [ ] depends on: #19959 - [ ] depends on: #20005 - [ ] depends on: #19955 - [x] depends on: #20263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-category-theory	1513/7	Mathlib.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/CardinalArrow.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Limits/Comma.lean,Mathlib/CategoryTheory/Limits/TypesFiltered.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Comma.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/ParallelMaps.lean,Mathlib/SetTheory/Cardinal/HasCardinalLT.lean,docs/references.bib	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	281-65177 9 months ago	unknown	0-0 0 seconds
27451	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	280-50104 9 months ago	280-50105 280 days ago	17-52359 17 days
27987	kckennylau author:kckennylau	feat(RingTheory/Valuation): define ball, closed ball, and sphere	--- The pullback PR of #26827 and #27451. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory large-import	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	280-49733 9 months ago	280-49734 280 days ago	6-6455 6 days
27444	grunweg author:grunweg	feat: generalise more lemmas to enorms	The selection of lemmas may seem eclectic, but follows a clear path: I'm working on generalising the last section of `IntegrableOn.lean` to enorms. (This will be continued in a later PR.) --- Commits can be reviewed independently. - [x] depends on: #27419 (first commits) - [x] depends on: #27456 (last commits) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson WIP	10/0	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	280-45729 9 months ago	298-28740 298 days ago	0-259 4 minutes
24862	grunweg author:grunweg	feat(LocallyIntegrable): generalise more to enorms	--- Note: github's diff is very confused; it includes changes which very clearly are already on the master branch. I'll see which of the remaining changes after the dependencies have landed is already polished enough. - [x] depends on: #24352 - [x] depends on: #27457 (this half is settled already) - [ ] open question: filter lemmas; IsBoundedUnder is not the right condition as-is; need to think (or just not generalise) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-measure-probability	171/88	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	280-43454 9 months ago	370-24813 370 days ago	0-1 1 second
25133	erdOne author:erdOne	feat(Tactic/NormNum): support positive characteristic	Co-authored-by: Heather Macbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP large-import t-meta	250/39	Mathlib/Tactic/NormNum/CharP.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/Test.lean	5	5	['erdOne', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	278-64893 9 months ago	unknown	0-0 0 seconds
27003	eric-wieser author:eric-wieser	chore: use `Simp.ResultQ` more often	Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	18/22	Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean	3	7	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	278-64357 9 months ago	278-64358 278 days ago	32-70098 32 days
16150	urkud author:urkud	feat(Dynamics): Hopf decomposition	Prove Hopf decomposition. - [ ] rewrite to work with the saturations right away, not with a wandering set. - [ ] generalize to an action of a countable group, use fundamental domains. --- - [ ] depends on: #16146 - [ ] depends on: #16126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-dynamics t-measure-probability	212/0	Mathlib.lean,Mathlib/Dynamics/Ergodic/Dissipative.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	278-32329 9 months ago	unknown	0-0 0 seconds
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	278-19153 9 months ago	278-19153 278 days ago	71-27957 71 days
27759	plp127 author:plp127	chore(FreeAbelianGroup): deprecate multiplication	Deprecate multiplication on `FreeAbelianGroup` in favor of using `MonoidAlgebra`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	176/86	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/RingTheory/FreeCommRing.lean,Mathlib/RingTheory/FreeRing.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	276-71999 9 months ago	290-52311 290 days ago	0-79663 22 hours
21776	alreadydone author:alreadydone	Invertible modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	571/26	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/PicardGroup.lean	5	3	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	275-71548 9 months ago	460-84037 460 days ago	0-19 19 seconds
20722	ctchou author:ctchou	feat(Counterexamples): the Vitali set is non-measurable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-measure-probability new-contributor merge-conflict awaiting-author	258/3	Counterexamples.lean,Counterexamples/VitaliSetNotMeasurable.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,docs/1000.yaml	4	76	['ctchou', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'vihdzp']	vihdzp assignee:vihdzp	275-61894 9 months ago	489-53864 489 days ago	0-47663 13 hours
27446	grunweg author:grunweg	chore: more enorm lemmas	Nothing to see yet: this is a big mess! Start unrolling at `eLpNorm_le_eLpNorm_top_mul_eLpNorm_enorm`; that proof could be a good next target. Need a version of `eLpNorm'_const_smul' which applies to NNReal (or ENNReal, I guess): need to generalise a bunch of lemmas for that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson	107/9	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	275-53408 9 months ago	298-27883 298 days ago	0-172 2 minutes
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. Note the issue with the existing `MonadExcept` instance still applies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	16/0	Mathlib/Control/Monad/Cont.lean	1	25	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	273-62708 9 months ago	699-75510 699 days ago	339-54818 339 days
28276	eric-wieser author:eric-wieser	refactor: tidy `lift_unique` lemmas	--- - [ ] depends on: #28275 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/20	Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/ExteriorAlgebra/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	273-61979 9 months ago	unknown	0-0 0 seconds
28502	gilesgshaw author:gilesgshaw	feat(Logic/Basic): avoid unnecessary uses of choice	Certain proofs are modified to remove a dependence on the axoim of choice --- - [ ] depends on: #28623	blocked-by-other-PR new-contributor merge-conflict awaiting-author t-logic	83/74	Mathlib/Logic/Basic.lean	1	7	['Ruben-VandeVelde', 'eric-wieser', 'gilesgshaw', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	272-83706 8 months ago	275-69235 275 days ago	0-35689 9 hours
28622	alreadydone author:alreadydone	chore(Mathlib): replace `=>` by `↦`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	51792/51792	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/Algebra/Category/GrpWithZero.lean,Mathlib/Algebra/Category/HopfAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean	3838	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	272-22633 8 months ago	272-22634 272 days ago	0-62065 17 hours
24793	tristan-f-r author:tristan-f-r	feat: trace of unitarily similar matrices	adds a theorem relating trace to unitarily similar matrices used in the easy direction of specht's theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	7/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	4	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'tristan-f-r']	nobody	272-18272 8 months ago	370-49721 370 days ago	1-55872 1 day
27198	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): the Yoneda embedding is monoidal (for Day convolution)	We show that the Yoneda embedding is monoidal when we interpret its target category as Day presheaves (i.e presheaves with the Day convolution monoidal structure). The actual way we prove it is by registering a `LawfulDayConvolutionMonoidalCategoryStruct Cᵒᵖ (Type v₁) C`, for which the "interpretation" functor `C ⥤ Cᵒᵖ ⥤ Type v₁` is the Yoneda embedding. This allows to state a result independently of any size constraint on `C`. Then, we specialize to the case of a small category `C`, in this case, using the fact that the relevant colimit of preseaves exist, we use the fact that the interpretation functor induces a monoidal functor to put a `Monoidal` instance on the functor `dayYoneda : C ⥤ (Cᵒᵖ ⊛⥤ Type v₁) := yoneda ⋙ (equiv Cᵒᵖ _).inverse`. --- I was unsure about which form of simp lemmas we want for characterization of the monoidal structure on `dayYoneda`. I opted for making the "fully applied" lemmas simp, but still leaves the "unapplied" ones as non-simp just in case. - [ ] depends on: #27175 - [x] depends on: #25732 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed blocked-by-other-PR t-category-theory	1847/26	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Types.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/Preserves.lean	8	8	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	271-82239 8 months ago	306-66326 306 days ago	0-21 21 seconds
28626	alreadydone author:alreadydone	chore(Archive, Counterexamples): replace => by ↦	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	288/288	Archive/Arithcc.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/PropEncodable.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/AscendingDescendingSequences.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/AharoniKorman.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/GameMultiplication.lean,Counterexamples/Girard.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Phillips.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean	54	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	270-51759 8 months ago	270-51760 270 days ago	2-47136 2 days
26078	kckennylau author:kckennylau	feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves	--- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebraic-geometry	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	nobody	270-48769 8 months ago	270-48769 270 days ago	64-11252 64 days
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ --- - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file) Here is a relevant TODO in Mathlib: https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48 I would appreciate your comments. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	750/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	5	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	270-33814 8 months ago	493-4373 493 days ago	43-22586 43 days
7300	ah1112 author:ah1112	feat: synthetic geometry	This is adding synthetic geometry using Avigad's axioms and formalizing Euclid Book I, through the Pythagorean theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted t-euclidean-geometry	2661/0	Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean	4	74	['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'plp127', 'tb65536', 'urkud']	nobody	270-10445 8 months ago	970-49330 970 days ago	0-84 1 minute
27403	MoritzBeroRoos author:MoritzBeroRoos	fix: replace probably erroneous usage of ⬝ (with old \cdot) by · (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations \cdot and \centerdot resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for center..). This pr replaces instances of ⬝ where · was probably meant. All of the replacement is in comments, except for the file bench_summary.lean which is used for priting the github benchmark results. Since this file is about scientific notation of numbers, sure · was meant to be used, not a rectangle. [Related](https://github.com/leanprover-community/mathlib4/pull/27399) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	195/195	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Unbundled/InvariantExtension.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleAddChar.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/FieldTheory/PurelyInseparable/PerfectClosure.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/Matrix.lean,scripts/bench_summary.lean	49	5	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	268-84795 8 months ago	291-60717 291 days ago	7-54661 7 days
28042	kckennylau author:kckennylau	feat(Topology/ValuativeRel): a topological basis indexed by pairs of elements	--- The pullback PR of #27314 and #27163. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	268-84749 8 months ago	278-49793 278 days ago	7-4998 7 days
23966	astrainfinita author:astrainfinita	refactor: unbundle algebra from `{Seminormed, Normed}(Add)(Comm)Group`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #23621 - [ ] depends on: #23961	t-algebra blocked-by-other-PR merge-conflict slow-typeclass-synthesis t-analysis label:t-algebra$	3233/2752	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/FDeriv/Pi.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Star.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/FDeriv/WithLp.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean	579	7	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	268-60016 8 months ago	unknown	0-0 0 seconds
27399	MoritzBeroRoos author:MoritzBeroRoos	chore: replace every usage of ⬝ᵥ (with old \cdot) by ·ᵥ (with \centerdot)	Discussion at [zulip](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.5Ccdot.20!.3D.20.5Ccenterdot). Currently the abbreviations `\cdot` and `\centerdot` resolve to different, with the naked eye nearly undistinguishable symbols (despite the c in cdot surely standing for `center`..): - `\cdot` gives ⬝ [U+2B1D](https://www.compart.com/en/unicode/U+2B1D) "Black Very Small Square" - `\centerdot` gives · [U+00B7](https://www.compart.com/en/unicode/U+00B7) "Middle Dot" Mathlib mostly uses the `\centerdot` variant, except for the dotProduct notation and some probably unsuspecting people wanting \centerdot but getting \cdot in their comments and 6 uses of a notation using the raw `\cdot` without any subscript at `Mathlib\Topology\Homotopy\Product.lean`. This PR replaces the dot product `⬝ᵥ` with its `\centerdot` counterpart `·ᵥ`. The related PR [here](https://github.com/leanprover/vscode-lean4/pull/639) can then overwrite the `\cdot` abbreviation, to produce the same symbol as the `centerdot` abbreviation does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	133/133	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Matrix/Block.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Hadamard.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Matrix/Reflection.lean,Mathlib/Data/Matrix/RowCol.lean,Mathlib/Data/Matrix/Vec.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/DotProduct.lean,Mathlib/LinearAlgebra/Matrix/Nondegenerate.lean,Mathlib/LinearAlgebra/Matrix/Orthogonal.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Matrix/SchurComplement.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Trace.lean,Mathlib/LinearAlgebra/PerfectPairing/Matrix.lean,Mathlib/LinearAlgebra/Projectivization/Constructions.lean,Mathlib/Topology/Instances/Matrix.lean	25	6	['MoritzBeroRoos', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	268-46627 8 months ago	291-60718 291 days ago	7-62439 7 days
27479	iu-isgood author:iu-isgood	feat: Abel's Binomial Theorem	We have formalized Abel's Binomial Theorem as part of an REU project. There are a few remaining sorrys, but we will finish them soon. I will edit this PR message later according to community rules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	268-46388 8 months ago	297-44085 297 days ago	0-237 3 minutes
28787	alreadydone author:alreadydone	feat(Counterexamples): a domain whose ring of differences is not a domain	Example produced by Gemini 2.5 Pro: https://gemini.google.com/share/9558539e1309 --- - [ ] depends on: #28468 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR large-import label:t-algebra$	1200/204	Counterexamples.lean,Counterexamples/GrothendieckAddGroupIsDomain.lean,Mathlib.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Order/Nonneg/Basic.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/GroupTheory/MonoidLocalization/Archimedean.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Localization/Additive.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/Ideal.lean,Mathlib/RingTheory/Localization/StrongRankCondition.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean,Mathlib/RingTheory/Trace/Quotient.lean	23	6	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	267-49838 8 months ago	267-55282 267 days ago	1-13263 1 day
24719	madvorak author:madvorak	feat(LinearAlgebra/Matrix/NonsingularInverse): inverting `Matrix` inverts its `LinearEquiv`	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2324719.20cannot.20find.20home/with/517142655	awaiting-author t-algebra label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	16	['eric-wieser', 'github-actions', 'madvorak', 'ocfnash']	nobody	265-71325 8 months ago	287-53302 287 days ago	86-37603 86 days
27437	kckennylau author:kckennylau	feat(RingTheory/Valuation): some lemmas about comparing with 1 and 0 and with each other	From the 2025 Local Class Field Theory Workshop. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-ring-theory	109/22	Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean	4	20	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'matthewjasper', 'pechersky']	nobody	264-49208 8 months ago	284-13819 284 days ago	14-27134 14 days
28148	kckennylau author:kckennylau	feat(Matrix): Simproc and Rw-proc for Matrix Transpose	Co-authored by Aaron Liu. ```lean example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of% 2 3] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by rw [transpose_of] example : !![1, 2, 3; 4, 5, 6]ᵀ = !![1, 4; 2, 5; 3, 6] := by simp only [matrix_transpose] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	267/8	Mathlib.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,MathlibTest/Simproc/Matrix.lean,MathlibTest/matrix.lean,scripts/noshake.json	8	32	['eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'plp127']	eric-wieser assignee:eric-wieser	264-3561 8 months ago	264-3562 264 days ago	12-78143 12 days
28686	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Erdős-Stone theorem	Proves the Erdős-Stone theorem: If `G` has at least `(1 - 1 / r + o(1)) * n ^ 2 / 2` many edges, then `G` contains a copy of a `completeEquipartiteGraph (r + 1) t`. --- - [ ] depends on: #28685 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics merge-conflict WIP	757/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-53401 8 months ago	271-70344 271 days ago	0-10 10 seconds
28687	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Erdős-Stone-Simonovits theorem	Proves the Erdős-Stone-Simonovits theorem: If the chromatic number of `H` equals `r + 1 > 0`, then the `extremalNumber` of `H` is greater than `(1 - 1 / r - o(1)) * card V ^ 2 / 2` and at most `(1 - 1 / r + o(1)) * card V ^ 2 / 2`. --- - [ ] depends on: #28686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR t-combinatorics	879/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-53400 8 months ago	271-70159 271 days ago	0-32 32 seconds
28689	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove well-known corollaries of the Erdős-Stone-Simonovits theorem	Proves well-known corollaries of the Erdős-Stone-Simonovits theorem: E.g., if the chromatic number of `H` equals `r + 1 > 1`, then `extremalNumber n H` is asymptotically equivalent to `(1 - 1 / r) * n.choose 2` as `n → ∞` --- - [ ] depends on: #28687 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR t-combinatorics	958/14	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Nat/Cast/Order/Field.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-53399 8 months ago	271-69933 271 days ago	0-45 45 seconds
26952	robin-carlier author:robin-carlier	feat(CategoryTheory/DayConvolution): monoid objects internal to day convolutions	In this file, given `F : C ⊛⥤ V`, we provide a bijective correspondence between lax monoidal structures on `F.functor` and `Mon_Class F` structures. We also prove that through this correspondance, monoidal natural transformations correspond to morphisms of internal monoid objects. --- - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1574/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Mon_.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-25610 8 months ago	313-20693 313 days ago	0-584 9 minutes
27133	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `C ⊛⥤ V` is monoidal closed when `V` is	When `V` is a monoidal closed category admitting enough limits, we show that the type alias `C ⊛⥤ V` for functors `C ⥤ V` with Day convolution monoidal structure is monoidal closed using the API for `LawfulDayConvolutionClosedMonoidalCategoryStruct` developped in #27119. We expose the required data to exhibit (realization as a functor of) the internal hom as a suitable, and we port the lemmas that characterize its functoriality in that regard, as well as the evaluation and coevaluation morphisms. --- - [ ] depends on: #27119 - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1706/20	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	5	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-25485 8 months ago	308-51939 308 days ago	0-1192 19 minutes
27151	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `C ⊛⥤ V` is braided/symmetric when `C` and `V` are braided/symmetric	We use the machinery from #27150 to show that Day functors (the type alias for functors endowed with the Day convolution monoidal structure) are braided/symmetric when the base categories are. --- - [ ] depends on: #27150 - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1591/20	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-25483 8 months ago	307-72432 307 days ago	0-1022 17 minutes
27175	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `LawfulDayConvolutionMonoidalCategoryStruct.ι C V D` is monoidal when the target is `C ⊛⥤ V`	We prove a "soundness" result for our notion of `LawfulDayConvolutionMonoidalCategoryStruct`, i.e that when be interpret its field `ι` as valued in Day functors (the type alias for functors endowed with the Day convolution monoidal structure), the data from `LawfulDayConvolutionMonoidalCategoryStruct` turn `ι` in a monoidal functor, proving that the categories endowed with such a structure are precisely those that can be identified to monoidal (not necessarily full) subcategories of Day functors. Implicitly, the structure isomorphisms for this monoidal structure bundle isomorphisms asserting unicity up to isomorphisms of day convolutions. --- - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1585/24	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	263-25482 8 months ago	307-39564 307 days ago	0-673 11 minutes
26097	adomani author:adomani	dev: the relative linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-linter	316/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Local.lean,Mathlib/Util/ParseGit.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	263-2257 8 months ago	unknown	0-0 0 seconds
25741	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/SimplicialObject): definitions of simplicial objects by generators and relation	We leverage the equivalence between `SimplexCategory` and `SimplexCategoryGenRel` to give new constructors for (co)simplicial objects, as well as constructors for natural transformations (resp. isomorphism) between those. Final PR in the series of PR formalising the equivalence between `SimplexCategory` and `SimplexCategoryGenRel`. --- - [ ] depends on: #25740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21748. Original PR: https://github.com/leanprover-community/mathlib4/pull/21748	t-algebraic-topology blocked-by-other-PR t-category-theory large-import merge-conflict	1363/9	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/AlgebraicTopology/SimplicialObject/GeneratorsRelations.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	259-65677 8 months ago	329-58965 329 days ago	11-15676 11 days
26931	javra author:javra	feat(CategoryTheory/Enriched): `V`-enriched isomorphisms	Defines isomorphisms in `V`-enriched categories and relate them to ordinary isomorphisms in the case of ordinary enriched categories. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory infinity-cosmos	211/14	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/Iso.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Iso.lean	6	21	['emilyriehl', 'github-actions', 'javra', 'joelriou', 'mathlib4-merge-conflict-bot', 'mckoen']	nobody	259-65067 8 months ago	293-69314 293 days ago	19-74885 19 days
27707	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Selberg's weights and prove basic results.	This PR continues the work from #23635. Original PR: https://github.com/leanprover-community/mathlib4/pull/23635 - [ ] depends on: #27702	merge-conflict t-number-theory blocked-by-other-PR t-analysis	407/83	Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	259-32327 8 months ago	289-16006 289 days ago	1-28956 1 day
25208	erdOne author:erdOne	feat(LinearAlgebra): `tensor_induction` macro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	87/116	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/Finite.lean,Mathlib/RingTheory/Unramified/Finite.lean	8	8	['chrisflav', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	259-34 8 months ago	357-57881 357 days ago	0-600 10 minutes
28803	astrainfinita author:astrainfinita	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. This PR continues the work from #23961. - Change `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` so they no longer carry algebraic data. - Deprecate `ESeminormed(Add)CommMonoid` and `ENormed(Add)CommMonoid` in favor of `ESeminormed(Add)Monoid` and `ENormed(Add)Monoid` with a commutative algebraic typeclass. \|Old\|New\| \|---\|---\| \| `[ESeminormed(Add)(Comm)Monoid E]` \| `[(Add)(Comm)Monoid E] [ESeminormed(Add)Monoid E]` \| \| `[ENormed(Add)(Comm)Monoid]` \| `[(Add)(Comm)Monoid E] [ENormed(Add)Monoid]` \| See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2328803.20refactor.3A.20unbundle.20algebra.20from.20.60ENormed*.60/with/536024350) ------------ - [x] depends on: #28813	t-algebra merge-conflict slow-typeclass-synthesis awaiting-zulip t-analysis label:t-algebra$	80/63	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	14	28	['astrainfinita', 'bryangingechen', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	grunweg assignee:grunweg	258-17562 8 months ago	266-55116 266 days ago	0-20585 5 hours
26935	Paul-Lez author:Paul-Lez	feat(Analysis/SpecialFunction/NthRoot): definition and basic API of Real.nthRoot	This PR continues the work from #25364. Original PR: https://github.com/leanprover-community/mathlib4/pull/25364 Co-authored-by: Eric Wieser	t-analysis	311/0	Mathlib/Analysis/SpecialFunctions/NthRoot.lean	1	10	['Paul-Lez', 'eric-wieser', 'github-actions', 'mo271', 'smmercuri', 'yury-harmonic']	nobody	257-19672 8 months ago	312-66442 312 days ago	0-74776 20 hours
27995	kckennylau author:kckennylau	feat(RingTheory/Valuation): alternate constructors for Valuation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-CI	82/0	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/RingTheory/Valuation/Basic.lean	4	22	['YaelDillies', 'github-actions', 'grunweg', 'kckennylau', 'pechersky']	nobody	255-77947 8 months ago	268-49401 268 days ago	17-72481 17 days
26159	upobir author:upobir	feat(Algebra/QuadraticDiscriminant): Adding inequalities on quadratic from inequalities on discriminant	This PR continues the work from #24517. Original PR: https://github.com/leanprover-community/mathlib4/pull/24517 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	34/0	Mathlib/Algebra/QuadraticDiscriminant.lean	1	8	['chrisflav', 'github-actions', 'tb65536', 'upobir']	chrisflav assignee:chrisflav	254-50851 8 months ago	278-42379 278 days ago	55-10605 55 days
26908	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): alternative ext principle for unitors	Currently, our infrastructure for left/right unitors for Day convolution of functors `C ⥤ V` do not have satisfactory extensionality principle: the current way to characterize morphisms out of `U ⊛ F` is the default extensionality principle for Day convolution, which characterizes first such functors via functors out of `U ⊠ F`. Left unitors are then obtained using the fact `U ⊠ F` is a left Kan extension of a functor from `PUnit × C` (which is equivalent to `C`) but we did not record on its own this principle. Using the transitivity of left Kan extensions proved in #26899, we directly exhibit `U ⊛ F` as a left Kan extension of `F ⋙ tensorLeft (𝟙_ V)` along `tensorLeft (𝟙_ C)`. The unit of this Kan extension is composed exactly of the morphisms that appear in the [characterization of left unitors](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/Monoidal/DayConvolution.html#CategoryTheory.MonoidalCategory.DayConvolutionUnit.leftUnitor_hom_unit_app). We also slightly generalize the instances that express that external products with unitors are left Kan extensions, so that they can be used when taking external products with more complicated functors than currently. This is again useful when chaining extensionality lemmas for morphisms out of terms of the form `(F ⊛ U) ⊛ G`. We prove a similar thing for right unitors With this, it should be possible to have a much more satisfactory way of working with Day convolutions: this allows to "elimiinate" units without ending up with terms in an external product. --- - [ ] depends on: #26899 - [ ] depends on: #26906 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	307/18	Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	252-49907 8 months ago	252-49908 252 days ago	0-1812 30 minutes
27150	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for braided and symmetric structure on day convolutions monoidal categories	Following the pattern in #27119, we give API to construct `BraidedCategory` and `SymmetricCategory` structures on a monoidal category equipped with a `LawfulDayConvolutionMonoidalCategoryStruct`. To achieve this, we introduce an other type class `LawfulDayConvolutionBraidedCategoryStruct` that bundles an associator isomorphism that behaves like the one constructed for functors in #27067. We provide a noncomputable constructor for this typeclass that takes as input fullness of the "realization" functor to a category of functors, and we show that the typeclasses are sufficient to define the desired structures. --- - [x] depends on: #27067 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	826/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	252-44946 8 months ago	307-74641 307 days ago	0-1002 16 minutes
26462	PSchwahn author:PSchwahn	feat(LinearAlgebra/Projection): add results about inverse of `Submodule.prodEquivOfIsCompl`	Add two theorems `Submodule.prodEquivOfIsCompl_symm_apply` and `Submodule.prodEquivOfIsCompl_symm_add`, which are API for `Submodule.prodEquivOfIsCompl`. We believe these theorems are useful; for example, we have used their statements in a [classification formalization project](https://github.com/LieLean/LowDimSolvClassification). Co-authored by: - [Viviana del Barco](https://github.com/vdelbarc) - [Gustavo Infanti](https://github.com/GuQOliveira) - [Exequiel Rivas](https://github.com/erivas) --- I am not sure whether the `prodEquivOfIsCompl_symm_apply` theorem should be tagged with `@[simp]`; this might lead to confluence issues. Opinions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	252-17756 8 months ago	252-48859 252 days ago	73-43082 73 days
27119	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): constructors for closed monoidal day convolution monoidal structures	Following the pattern introduced in #26798 and #26820 and using results of #26879, we introduce a typeclass `LawfulDayConvolutionClosedMonoidalCategoryStruct` that encodes the data needed on a `LawfulDayConvolutionMonoidalCategoryStruct` to define well-behaved internal homs. We give a constructor assuming existence of relevant ends, and prove that this data defines a `MonoidalClosed` instance on the monoidal category structures one can deduce from `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #27079 - [x] depends on: #27091 - [x] depends on: #26879 - [x] depends on: #26820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	900/9	Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean	2	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	251-58797 8 months ago	308-80109 308 days ago	0-1 1 second
28623	gilesgshaw author:gilesgshaw	feat(Logic/Basic): minor additions and simplification of proofs	Add new theorems and simplify proofs. Specifically, we add the family of related theorems `apply_dite_iff_exists`, `apply_dite_iff_forall`, `apply_ite_iff_and` and `apply_ite_iff_or`. For each other 'family' of theorems in the file that is analogous to the above, we do the following - Simplify proofs where possible, e.g. by appealing to the new theorems - Complete the family, if any of the corresponding four are missing - Rename to ensure consistency with the above pattern ---	merge-conflict t-logic new-contributor	83/55	Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/SetTheory/Ordinal/Notation.lean	9	12	['eric-wieser', 'gilesgshaw', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	awainverse assignee:awainverse	251-52658 8 months ago	251-52659 251 days ago	10-61840 10 days
28804	grunweg author:grunweg	feat: a few more tactic linters	All analysis passes in this list have been suggested [on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tactic.20analysis.20framework/with/535766713). --- Untested, so may not work yet. - [ ] depends on: #28802 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	204/26	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TacticAnalysis/FunProp.lean,Mathlib/Tactic/TacticAnalysis/Misc.lean,MathlibTest/TacticAnalysis2.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	250-72222 8 months ago	268-59055 268 days ago	0-705 11 minutes
13036	joelriou author:joelriou	feat(CategoryTheory/Sites): under certain conditions, cover preserving functors preserve 1-hypercovers	Previously, in order to show that a functor between Grothendieck sites was continuous, it was necessary to show that it was "cover preserving" and "compatible preserving". There were two lemmas which could be used in order to show that a functor was "compatible preserving". Since #13012, the better condition of "1-hypercover preserving" functor was introduced and it implies that the functor is continuous. In this PR, under the same assumptions as in the two lemmas mentionned above, we show that cover preserving functors are 1-hypercover preserving functors. This gives slightly better criteria in order to show that a functor is continuous. --- - [x] depends on: #13004 - [x] depends on: #13011 - [x] depends on: #13012 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	94/7	Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	4	3	['github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	250-21982 8 months ago	729-60914 729 days ago	0-1 1 second
29527	kim-em author:kim-em	feat: script for checking Github URLs	This adds scripts/check_github_urls.py, which checks for links for closed github issues/prs, and shows the context at the link. Of course, many links are to closed pull requests because the discussion there provides useful context. Not sure how to best filter results.	WIP CI	475/0	scripts/README.md,scripts/check_github_urls.py	2	2	['github-actions', 'kim-em']	nobody	250-11135 8 months ago	250-11880 250 days ago	0-1 1 second
27335	eric-wieser author:eric-wieser	chore(Data/List): use simp-normal-form for boolean equalities	This replaces `¬(p x = true)` with `p x = false`. It also makes explicit some adjacent `h : p x` spellings for symmetry, but the `= true`s were already implied by the coercion. Zulip: [#lean4 > `h : ¬(b = true)` vs `h : b = false` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.60h.20.3A.20.C2.AC.28b.20.3D.20true.29.60.20vs.20.60h.20.3A.20b.20.3D.20false.60/near/529976237) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	38/32	Mathlib/Data/List/DropRight.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/TakeWhile.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	250-5624 8 months ago	301-809 301 days ago	0-19242 5 hours
25778	thefundamentaltheor3m author:thefundamentaltheor3m	feat: Monotonicity of `setIntegral` for nonnegative functions	This PR makes it easier to prove monotonicity of the Bochner integral on sets for nonnegative functions by removing the stronger assumption required by the general monotonicity lemma that both of the functions being compared must be integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-measure-probability new-contributor	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	249-48380 8 months ago	340-56218 340 days ago	0-11893 3 hours
29484	eric-wieser author:eric-wieser	refactor: switch to [] notation for Stream'	I'll continue fixing this only if people agree this is a good use of this notation. [#mathlib4 > Changing `Stream.Seq` to use `GetElem` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Changing.20.60Stream.2ESeq.60.20to.20use.20.60GetElem.60/near/538548680) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data large-import	195/173	Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/ContinuedFractions/Translations.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Control/Fix.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Data/WSeq/Productive.lean	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	249-20643 8 months ago	unknown	0-0 0 seconds
22517	j-loreaux author:j-loreaux	feat: `ℕ+` powers in semigroups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP large-import	275/28	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/PNatPowAssoc.lean,Mathlib/Algebra/Group/PPow.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	14	6	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mattrobball']	nobody	248-25965 8 months ago	441-27546 441 days ago	0-27 27 seconds
29615	eric-wieser author:eric-wieser	chore: add a computable shortcut for `AddCommMonoid ℂ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy	9/1	Mathlib/Analysis/Complex/Basic.lean	1	1	['github-actions']	nobody	247-66824 8 months ago	247-66907 247 days ago	247-66900 247 days
25069	erdOne author:erdOne	feat(EllipticCurve): rational points of singular nodal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	251/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Node.lean	3	14	['Multramate', 'acmepjz', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	246-41166 8 months ago	262-72975 262 days ago	100-20892 100 days
25070	erdOne author:erdOne	feat(EllipticCurve): rational points on singular cuspidal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	123/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Cusp.lean	2	12	['Multramate', 'acmepjz', 'adamtopaz', 'erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	246-41165 8 months ago	272-42129 272 days ago	90-52970 90 days
26670	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `conjClassesEquivH1`	This PR continues the work from #21837. Original PR: https://github.com/leanprover-community/mathlib4/pull/21837	merge-conflict awaiting-author t-algebra label:t-algebra$	162/5	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Basic.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	5	3	['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'yu-yama']	erdOne assignee:erdOne	245-69459 8 months ago	270-32837 270 days ago	49-15167 49 days
26154	ADedecker author:ADedecker	refactor: add refactored APIs for algebraic filter bases	This PR continues the work from #18437. Original PR: https://github.com/leanprover-community/mathlib4/pull/18437	merge-conflict t-topology	651/0	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	5	3	['ADedecker', 'github-actions', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	245-64902 8 months ago	245-64903 245 days ago	87-79752 87 days
27024	grunweg author:grunweg	feat: Gram-Schmidt orthonormalisation for sections of a vector bundle	Add a parametrised version of Gram-Schmidt, for sections of a topological vector bundle with a bundle metric. This will be used to define orthonormal local frames. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- - [x] depends on: #27023 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-differential-geometry	279/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Topology/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	4	71	['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	245-55559 8 months ago	277-41689 277 days ago	28-11083 28 days
28580	kmill author:kmill	refactor: simplify implementation of `filter_upwards`	This PR makes a few changes to `filter_upwards`: - it uses `focus`, which prevents multiGoalLinter from ever blaming the tactics used inside its implementation - it constructs the whole proof syntax and elaborates it at once using `evalTactic` and `refine`, rather than using the lower-level TermElab API, which can lose track of goals - it's written in a way that doesn't require goals to be in some particular order This was motivated by some multiGoalLinter issues I ran into when working on https://github.com/leanprover/lean4/pull/9942 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order t-meta	14/16	Mathlib/Order/Filter/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	245-53518 8 months ago	274-1183 274 days ago	0-8809 2 hours
29010	grunweg author:grunweg	chore: more tests for field_simp features and edge cases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		135/0	MathlibTest/FieldSimp.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	244-31362 8 months ago	264-3213 264 days ago	0-69950 19 hours
27937	madvorak author:madvorak	feat(Logic/Basic): `congr_heq₂`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-logic	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	243-68095 8 months ago	269-68880 269 days ago	17-62644 17 days
29741	JovanGerb author:JovanGerb	trying #28803 using lean#10178	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1111/718	.github/actionlint.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/report-grind-regressions.yml,Cache/Requests.lean,Mathlib.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/SMul.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Nat/GCD/BigOperators.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/Init.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/Lean/Meta/CongrTheorems.lean,Mathlib/LinearAlgebra/PID.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/Refs.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Datatypes.lean,Mathlib/Tactic/Linter/DeprecatedModule.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/StacksAttribute.lean,Mathlib/Tactic/SuppressCompilation.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/WLOG.lean,Mathlib/Testing/Plausible/Sampleable.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/ParseCommand.lean,Mathlib/Util/Superscript.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/MinImports.lean,MathlibTest/RewriteSearch/Basic.lean,MathlibTest/RewriteSearch/Polynomial.lean,MathlibTest/StacksAttribute.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Variable.lean,MathlibTest/hint.lean,MathlibTest/lift.lean,MathlibTest/linarith.lean,MathlibTest/notation3.lean,MathlibTest/propose.lean,MathlibTest/renameBvar.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/success_if_fail_with_msg.lean	105	2	['JovanGerb', 'leanprover-bot']	nobody	243-63704 8 months ago	243-70810 243 days ago	0-15 15 seconds
7125	eric-wieser author:eric-wieser	feat: additive monoid structure via biproducts	I suspect I'm missing a trick with these transport lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory awaiting-CI	237/0	Mathlib/CategoryTheory/Limits/Skeleton.lean	1	3	['alreadydone', 'eric-wieser', 'mathlib4-merge-conflict-bot']	nobody	243-26623 8 months ago	unknown	0-0 0 seconds
27950	alreadydone author:alreadydone	feat(MonoidAlgebra): criteria for `single` to be a unit, irreducible or prime	--- - [ ] depends on: #27936 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	714/192	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Finite.lean,Mathlib/Algebra/Divisibility/Hom.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/MonoidAlgebra/Divisibility.lean,Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Prime/Prod.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Coset/Card.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Period.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	33	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	242-58245 8 months ago	287-29324 287 days ago	0-53 53 seconds
28067	grunweg author:grunweg	Docstring enumerations	Tracking PR; to be split. Audit all ocurrences of `^ \S`; exhaustive. --- - [x] depends on: #28068 - [x] depends on: #28069 - [ ] depends on: #28070 - [x] depends on: #28118 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	264/263	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Defs.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/RingTheory/Grassmannian.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/WittVector/Teichmuller.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/TermCongr.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/Superscript.lean,docs/Conv/Guide.lean	38	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	240-59822 7 months ago	284-73479 284 days ago	0-2904 48 minutes
28908	joelriou author:joelriou	feat(CategoryTheory): Pullback functors on `Over` categories in `Type` have right adjoints	Given a map `f : E → B`, in order to show that `Over.pullback f : Over B ⥤ Over E` commutes with colimits, we show that it admits a right adjoint. In order to do that, we first construct a functor `overPullback f : Over B ⥤ Over E` whose definition involves explicit types rather than categorical pullbacks, and we define its right adjoint `overPushforward f : Over E ⥤ Over B`. (In a future PR, it will be shown that the `Over.pullback` also commutes with colimits in categories of presheaves, and hopefully this will be used in the construction of the Quillen model category structure on simplicial sets.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	103/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/OverPullback.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean	3	10	['emilyriehl', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'robin-carlier', 'sinhp']	nobody	238-36188 7 months ago	252-70921 252 days ago	13-50151 13 days
29330	plp127 author:plp127	chore: define `Fin.cycleIcc` with conditions	Redefine `Fin.cycleIcc` using conditionals instead of composing existing `Fin` operations together. Its worst-case runtime drops from O(n) to O(1). As a bonus, the definition no longer needs explaining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-group-theory	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	236-76499 7 months ago	236-76500 236 days ago	20-3817 20 days
29588	Periecle author:Periecle	feat(Analysis/Complex/Residue): Implement residue theory for complex functions at isolated singularities	# Add basic residue theory for complex functions This PR introduces the residue theory implementation in mathlib. ## Main additions - `HasIsolatedSingularityAt f c`: Predicate for functions with isolated singularities at point `c` - `residue f c hf`: The residue of `f` at isolated singularity `c`, defined via circle integrals - Radius independence: `residue_eq_two_pi_I_inv_smul_circleIntegral` - residue equals normalized circle integral for any valid radius - Holomorphic residues: `residue_of_holomorphic` - functions holomorphic in a neighborhood have zero residue - Simple pole formula: `residue_simple_pole` - for `f(z) = (z-c)⁻¹ * g(z)`, residue equals `g(c)` ## Implementation notes - Builds on existing circle integral infrastructure in `CauchyIntegral.lean` - Uses `Classical.choose` to extract witness radius from isolated singularity condition - Comprehensive documentation with mathematical context and examples - Establishes foundation for residue theorem, argument principle, and other applications ## Examples included - `residue(1/z, 0) = 1` (canonical simple pole) - Radius independence demonstration - Zero residues for holomorphic functions This provides the essential building blocks for complex analysis and first step to formalize residue theory.	awaiting-author t-analysis new-contributor	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	236-51858 7 months ago	248-58240 248 days ago	0-976 16 minutes
29482	mattrobball author:mattrobball	refactor (Algebra.Group.Defs): add npow/zpow/nsmul/zsmul as fields of new parents classes	Adds ZPow G class and makes this a parent to DivInvMonoid and the corresponding additive versions. Updates zpow/zsmul operations to use the integrated power/scalar multiplication syntax. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	177/122	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/BitVec.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/NormNum/Pow.lean	21	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	236-357 7 months ago	251-26682 251 days ago	0-274 4 minutes
27829	dupuisf author:dupuisf	feat: modify `cfc_tac` to use `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	60/50	Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Tactic/ContinuousFunctionalCalculus.lean	9	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	234-54600 7 months ago	290-52160 290 days ago	0-1 1 second
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-number-theory	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	234-51609 7 months ago	315-51546 315 days ago	73-10873 73 days
26178	ppls-nd-prs author:ppls-nd-prs	feat(CategoryTheory/Limits): Fubini for products	We show that the product of products is a product indexed by the sigma type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	17/0	Mathlib/CategoryTheory/Limits/Shapes/Products.lean	1	6	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier']	nobody	231-66902 7 months ago	332-76302 332 days ago	0-47665 13 hours
27214	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares	In this PR, we give the definition and first basic properties of categorical pullback squares. Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`. We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`. Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence. --- - [ ] depends on: #26679 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	786/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41691 7 months ago	231-41692 231 days ago	0-4464 1 hour
27391	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pseudofunctoriality structure of categorical pullback squares	Using pseudofunctoriality of the construction `CatCommSqOver`, we show that categorical pullback squares have pseudofunctorial-like structures: given a `CatCommSq T L R B` and a `CatPullbackSq T' L' R' B'`, and a `CatCospanTransform R B R' B'`, there is a functor `CatPullbackSq.functorOfTransform` between the top left corners of the two squares. We give `CatCommSq` instances that relates this functor with other constructions such as `CatCommSqOver.transform`. Similarly, we construct `CatPullbackSq.functorOfTransform₂`, that maps morphisms of `CatCospanTransforms` to natural transformations. Finally, we show that `functorOfTransform` respects identities and compositions. We do not yet prove that all of this data satisfies all the expected properties of pseudofunctors: this will be the content of a follow-up PR. --- - [ ] depends on: #27214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1090/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41689 7 months ago	299-60183 299 days ago	0-264 4 minutes
27432	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pseudofunctoriality of categorical pulback squares	In this PR, we show that the "unbundled pseudofunctor" data constructed in #27391 satisfy the axioms of an actual "unbundled pseudo-functor". This is intended to give all the required coherence for a formal bicategory-like proof of the fact that `CatCospanAdjunction`s from #26578 (resp. `CatCospanEquivalence`s from #26579) promote to adjunctions (resp. equivalences) between the top left corners of categorical pullback squares. --- - [ ] depends on: #27391 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory	1244/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41687 7 months ago	298-45884 298 days ago	0-1056 17 minutes
27481	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): adjunctions and equivalences of categorical pullback squares	We show that a `CatCospanAdjunction` (resp `CatCospanEquivalence`) induces adjunctions (resp. equivalences) of the categories that sit at the top left corners of categorical pullback squares via the pseudofunctoriality proved in #27432. Thanks to the lemmas that proves that categorical pullback squares are fully pseudofunctorial, the proof is purely formal ("a pseudofunctor maps adjunctions (resp. equivalences) to adjunctions (resp. equivalences)"), rather than being a painful computation for the triangle equalities. In particular, the results here show that two categorical pullback squares with equivalent "underlying categorical cospan" are equivalent, which realizes the equivalence-invariance of the notion of categorical pullbacks. We do not yet show that a (not-necessarily pullback) `CatCommSq T L R B` equivalent to a `CatPullbackSquare T' L' R' B'` via a `CatCospanEquivalence R B R' B'` is also a `CatPullbackSquare`: this will be the content of a follow-up PR. --- - [ ] depends on: #27432 - [ ] depends on: #26579 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	1829/1	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41685 7 months ago	297-43682 297 days ago	0-49 49 seconds
27686	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical/Square): more API for `CatPullbackSquare`	In this PR, we provide more API around the notion of categorical pullback squares. Having established the pseudofunctoriality of the notion in #27432, we characterize the behaviour of the equivalence `CatPullbackSquare.functorEquiv (π₁ R B) (π₂ R B) R B X : X ⥤ R ⊡ B ≌ CatCommSqOver R B X` via various (d)simp lemmas. This ports all the pseudofunctoriality and equivalence-invariance results of `CatPullbackSquare` to `CategoricalPullback`. We also show this equivalence is isomorphic to the one from `CategoricalPullback.functorEquiv`. Unfortunately, this small duplication is necessary, as `CatPullbackSquare.functorEquiv` is bulit using `CategoricalPullback.functorEquiv`. The equivalence `CategoricalPullback.functorEquiv` is now an implementation detail, the idiomatic way is to use `CatPullbackSquare.functorEquiv`; docstrings are updated accordingly. This deprecates some constructions and lemmas for `CategoricalPullback`: they are now special case of the API that is available for any categorical pullback square. --- - [ ] depends on: #27481 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2245/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41560 7 months ago	292-47423 292 days ago	0-2752 45 minutes
27687	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): squares equivalent to a `CatPullbackSquare`	We provide the last remaining piece of the "equivalence-invariance" of categorical pullback squares: given a `CatCommSq (T : C₁ ⥤ _) L R B`, a `CatPullbackSquare (T' : D₁ ⥤ _) L' R' B'`, a `ψ : CatCospanEquivalence R B R' B'` and an equivalence `C₁ ≌ D₁` that identifies to the functor induced by `ψ`, the `CatCommSq T L R B` can be promoted to a `CatPullbackSquare T L R B'`. In other words: a `CatCommSq` that is equivalent to a `CatPullbackSquare` is a `CatPullbackSquare`. --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2318/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41558 7 months ago	292-47772 292 days ago	0-959 15 minutes
27688	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): coherence statement for `CatPullbackSquare.inverse`	This PR records a "coherence" statement for `CatPullbackSquares`: it bridges the gap between the user-provided `inverse` field of the `CatPullbackSquare` structure, and the other way one can deduce an equivalence between the top left corner of the square and a categorical pullback (via the pseudofunctoriality of categorical pullback squares induced by the identity `CatCospanTransform`). We show the two possible natural isomorphisms on the inverses of the equivalences are in fact the same (hence the term "coherence"). --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2351/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41557 7 months ago	292-47426 292 days ago	0-283 4 minutes
27689	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): horizontal pasting calculus for `CatPullbackSquare`	Given two categorical commutative squares that can be horizontally pasted, we prove that if the rightmost square is a `CatPullbackSquare`, then the leftmost square is a `CatPullbackSquare` if and only if the horizontal composition of the squares is a `CatPullbackSquare`. This generalizes to `CatPullbackSquare` the well-known "pasting calculus" for pullback squares in a category. The statement is made available both in terms of the `Type`-class `CatPullbackSquare`, and in terms of the `Prop`-class `IsCatPullbackSquare`. --- - [ ] depends on: #27686 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2562/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41555 7 months ago	292-46686 292 days ago	0-667 11 minutes
27690	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): vertical pasting calculus for `CatPullbackSquare`	We mirror the constructions from #27689 to construct the vertical pasting calculus of `CatPullbackSquares`: given two vertically composable `CatCommSq` such that the bottom one is a `CatPullbackSquare`, the top square is a `CatPullbackSquare` if and only if the vertical composition (the "outer" square) is a `CatPullbackSquare`. --- - [ ] depends on: #27689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2841/74	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41553 7 months ago	291-66314 291 days ago	0-5969 1 hour
27740	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): pasting calculus for `CategoricalPullback`	Specialize the pasting calculus for categorical pullback squares to `CategoricalPullback̀` by providing equivalences of categories `R ⊡ (B₁ ⋙ B₂) ≌ (π₂ R B₂) ⊡ B₁` and `(R₁ ⋙ R₂) ⊡ B ≌ R₁ ⊡ (π₁ R₂ B)`. The `@[simps!]` attribute works wonderfully on these equivalences so that their component all have the expected (d)simp lemmas. --- - [ ] depends on: #27690 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	2872/75	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Square.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-41552 7 months ago	291-66324 291 days ago	0-1017 16 minutes
26330	Timeroot author:Timeroot	feat: "Junk value" test file	This PR continues the work from #25173. Original PR: https://github.com/leanprover-community/mathlib4/pull/25173	awaiting-author t-data	360/0	MathlibTest/Junk.lean	1	17	['SnirBroshi', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	231-8936 7 months ago	231-8936 231 days ago	48-67789 48 days
28807	alreadydone author:alreadydone	experiment: Submodule with SMul only (no Semiring)	--- `SubMulAction` already takes `SMul`. TODO: relax typeclass requirements of `Ideal` as well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	54/42	Mathlib/Algebra/Module/Submodule/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	231-4725 7 months ago	unknown	0-0 0 seconds
28808	alreadydone author:alreadydone	experiment: Ideal with Mul only (no Semiring)	--- - [ ] depends on: #28807 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR awaiting-CI merge-conflict label:t-algebra$	172/120	Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/LinearAlgebra/Matrix/Ideal.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Ideal/Lattice.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	231-4724 7 months ago	unknown	0-0 0 seconds
26466	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category	Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object. Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid. This PR was split from #25743. --- - [ ] depends on: #25743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology t-category-theory	571/111	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean	6	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	230-61093 7 months ago	325-68377 325 days ago	0-1708 28 minutes
28074	grunweg author:grunweg	Isbilinearmap	TODO see if it builds, move everything to the right place, add docs. update Pr description - written by Patrick, part of #26221 (and prereq for #28056) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	64/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/LinearAlgebra/BilinearMap.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	230-27460 7 months ago	284-73376 284 days ago	0-2 2 seconds
26579	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): equivalences of categorical cospans	Building on the notion of adjunctions of categorical cospans, we define equivalences of categorical cospans as a structure extending that of an adjunction, with the extra data of a chosen inverse of the unit and counit morphisms. To mirror the design for usual equivalences of categories, we provide an alternative constructor that requires the forward and inverse direction of the equivalence, as well as unit and counits already as isomorphisms, and only a proof of the left triangle identity. Finally, we also provide a third constructor that builds such an equivalence out of the data of 3 component equivalences of categories, as well as chosen `CatCommSq` on the functors of the these equivalences. This notion of equivalence of categorical cospans is intended to encode the required data to show the full equivalence invariance of the categorical pullback defined in #26366. --- - [ ] depends on: #26578 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	438/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	229-67957 7 months ago	321-72498 321 days ago	0-838 13 minutes
26578	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Pullbacks/Categorical/CatCospanTransform): adjunctions of categorical cospans	We build upon the bicategory-like structure developed in #26447 and #26412 to define the notion of adjunctions of categorical cospans. This is a structure encoding the data of two `CatCospanTransform`s, along with the usual unit and counit morphisms as part of the data, satisfying the usual left and right triangle identities. We provide basic API for these, such as extracting adjunctions between individual components. We also provide a proof that the notion satisfies a "coherence": with our chosen constructor, the forward direction of the structure `CatCommSq` on the left adjoints correspond to the inverse of the square for the right adjoints through `mateEquiv`. These adjunctions will be used as a substrate for defining equivalences of categorical cospans in a future PR: such an equivalence will be a structure extending a `CatCospanAdjunction` with isomorphisms data on the unit and co-unit (we will however provide alternative constructors in sync with the constructor for equivalences of categories). --- - [x] depends on: #26447 - [x] depends on: #26547 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory large-import	205/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean	1	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	229-64318 7 months ago	321-73490 321 days ago	0-625 10 minutes
26115	grunweg author:grunweg	WIP/proof of concept,feat: the inverse function theorem for manifolds	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry	348/0	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/InverseFunctionTheorem.lean,Mathlib/Topology/PartialHomeomorph.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	228-66205 7 months ago	unknown	0-0 0 seconds
28245	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformation/Icon): strict associativity and unitality of icon composition	We show that the vertical composition of icons defined in #28244 satisfies strict associativity and strict unitality. This morally shows that icons are fit as the 2-cells of a bicategory structure on bicategories and lax functors, though we do not record an instance of this sort. --- - [ ] depends on: #28244 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory awaiting-CI large-import merge-conflict	975/33	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Icon.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	228-32829 7 months ago	280-47774 280 days ago	0-331 5 minutes
30079	dagurtomas author:dagurtomas	feat(CategoryTheory): IsSheafFor as a multiequalizer condition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory	112/0	Mathlib/CategoryTheory/Sites/Multifork.lean	1	3	['chrisflav', 'github-actions', 'joelriou']	nobody	228-20153 7 months ago	230-85359 230 days ago	0-1 1 second
29012	grunweg author:grunweg	chore: reduce `Topology` imports in `Data`	Move Data.Real.Sqrt to Analysis. --- - [ ] depends on: #28966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed	25/21	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Mathlib.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Real/Sqrt.lean,Mathlib/Data/Rat/NatSqrt/Real.lean,Mathlib/Data/Real/CompleteField.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/Data/Real/StarOrdered.lean,Mathlib/NumberTheory/Zsqrtd/ToReal.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/NormNum/RealSqrt.lean,MathlibTest/positivity.lean	20	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	227-59631 7 months ago	264-69577 264 days ago	0-2683 44 minutes
26601	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory): make `Functor.comp` irreducible	[#mathlib4 > Functor identity `𝟭 _ ⋙ F = F` is definitional equality](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Functor.20identity.20.60.F0.9D.9F.AD.20_.20.E2.8B.99.20F.20.3D.20F.60.20is.20definitional.20equality/with/523978659) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	514/261	Mathlib/AlgebraicTopology/DoldKan/Compatibility.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/CatCommSq.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/Category/ULift.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Functor/Const.lean,Mathlib/CategoryTheory/Functor/Currying.lean,Mathlib/CategoryTheory/Functor/CurryingThree.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/Functorial.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/CategoryTheory/Functor/TwoSquare.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean,Mathlib/CategoryTheory/Join/Basic.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Products/Associator.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Sigma/Basic.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/CategoryTheory/Yoneda.lean	34	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	227-47432 7 months ago	unknown	0-0 0 seconds
23621	astrainfinita author:astrainfinita	chore: deprecate `LinearOrderedComm{Monoid, Group}WithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #20676	merge-conflict t-algebra t-order label:t-algebra$	261/205	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValExtension.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	44	24	['YaelDillies', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	226-46033 7 months ago	397-18406 397 days ago	5-42380 5 days
28630	Antidite author:Antidite	feat(Archive/Imo): right isosceles configuration in the complex plane	feat(Archive/Imo): right isosceles configuration in the complex plane This adds `Archive/Imo/Imo1975Q3.lean`, formalizing a triangle configuration with points A=0, B=1, C=z and auxiliary points R, P, Q built via complex rotations and sine-based scale factors. Main results: * `angle_and_distance`: ∠QRP = π/2 and dist Q R = dist R P. * Key identity `QRP_rot90`: (Q z).z − R.z = e^{iπ/2} · ((P z).z − R.z). Design/Style: * Minimal imports; module docstring; semantic lemma names; all definitions and theorems live under the namespace `IMO.TriangleConfig`. Moves: - (none) Deletions: - (none) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO awaiting-author new-contributor	196/0	Archive.lean,Archive/Imo/Imo1975Q3.lean	2	36	['Antidite', 'LLaurance', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	226-32648 7 months ago	226-32648 226 days ago	46-25852 46 days
30192	erdOne author:erdOne	feat(RingTheory): valuative topology = adic topology for discrete rank 1 valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-ring-theory t-topology	190/2	Mathlib.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Integers.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	6	3	['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	225-61756 7 months ago	226-56201 226 days ago	0-331 5 minutes
26886	pechersky author:pechersky	feat(NumberTheory/Padics/ValuativeRel): ValuativeRel ℚ_[p]	as well as instances for IsRankLeOne, IsNontrivial, IsDiscrete --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #26827	WIP t-number-theory blocked-by-other-PR t-algebra merge-conflict t-analysis label:t-algebra$	310/25	Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/NumberTheory/Padics/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	225-19233 7 months ago	315-4161 315 days ago	0-1386 23 minutes
27314	pechersky author:pechersky	feat(TopologyValued): `Valued` based on a range topology	Switch from a topology based on `fun γ : Γ₀ˣ => (v.ltAddSubgroup γ : AddSubgroup R)` to ``` fun rs : {rs : R × R // v rs.1 ≠ 0 ∧ v rs.2 ≠ 0} ↦ (v.ltAddSubgroup (Units.mk0 (v rs.val.2 / v rs.val.1) (by simp [rs.prop])) : AddSubgroup R) ``` This is in preparation for using `IsValuativeTopology` instead. In fact, that basis is precisely what `ValuativeTopology` asserts. `Valued.mk'` is kept, we do not yet rely on `IsValuativeTopology` and `UniformSpace`. The new `Valued` behaves the same way as it did before for `MulArchimedean` valuation codomains, which are all of the current in-mathlib uses of `Valued`. This is, for rank-one valuations. For valuations which rank one, but do not pass to the whole codomain, there are helper lemmas to discuss open/closed/clopen sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #27264 - [x] depends on: #27265 - [ ] depends on: #27163 - [x] depends on: #27339	merge-conflict t-topology blocked-by-other-PR	733/259	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	12	9	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	224-52284 7 months ago	302-6990 302 days ago	0-22127 6 hours
30135	erdOne author:erdOne	feat(RingTheory): `ValuativeRel` on subrings	--- @pechersky do we want this? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory	19/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean	1	5	['erdOne', 'github-actions', 'pechersky']	nobody	224-46329 7 months ago	225-19021 225 days ago	3-20137 3 days
28328	pechersky author:pechersky	chore(Topology/Valued): golf using local finite order of WithZeroTopology	have to juggle in a version of `mrangeRestrict` which works on valuations, and also juggle the scoped topology over the subtype topology --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #28325	t-number-theory blocked-by-other-PR t-algebra large-import merge-conflict t-topology label:t-algebra$	187/88	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	220-63705 7 months ago	278-80667 278 days ago	0-1600 26 minutes
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	50	['EtienneC30', 'arulandu', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	arulandu assignee:arulandu	220-41953 7 months ago	610-69502 610 days ago	1-21124 1 day
30359	JLimperg author:JLimperg	[Not a PR] Benchmark for Aesop RPINF precompilation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	5	['JLimperg', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	220-33960 7 months ago	unknown	0-0 0 seconds
30425	JLimperg author:JLimperg	[Not a PR] Benchmark Aesop with precompiled RPINF at instance transparency	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	220-16094 7 months ago	unknown	0-0 0 seconds
30438	JLimperg author:JLimperg	[Not a PR] Benchmark Aesop change that computes fewer RPINFs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	5	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	219-46442 7 months ago	unknown	0-0 0 seconds
30440	JLimperg author:JLimperg	[Not a PR] Benchmark Aesop with no `hypTypes` in `ForwardState` and `instances` RPINF transparency	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	219-41923 7 months ago	unknown	0-0 0 seconds
30452	JLimperg author:JLimperg	[Not a PR] Benchmark Aesop with no `hypTypes` in `ForwardState`, RPINF at `instances` transparency and lazy forward state	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	5/3	lake-manifest.json,lakefile.lean,scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	4	3	['JLimperg', 'github-actions', 'leanprover-bot']	nobody	219-22802 7 months ago	unknown	0-0 0 seconds
26284	plp127 author:plp127	feat: faster implementation of `Nat.primeFactorsList` + `@[csimp]` lemma	Add a function `Nat.primeFactorsListFast` that `#eval`s faster, and a `@[csimp]` lemma `Nat.primeFactorsList_eq_primeFactorsListFast` that shows `Nat.primeFactorsList = Nat.primeFactorsListFast`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	95/0	Mathlib/Data/Nat/Factors.lean	1	11	['b-mehta', 'github-actions', 'grunweg', 'plp127']	b-mehta assignee:b-mehta	218-58831 7 months ago	218-86044 218 days ago	111-15071 111 days
27990	kckennylau author:kckennylau	feat(Counterexamples): a nontrivial valuation with discrete topology	This file constructs a valuation on `K[X]` satisfying `IsValuativeTopology K[X] ∧ Nonempty (valuation K[X]).RankOne ∧ IsNontrivial K[X] ∧ DiscreteTopology K[X]`, and proves that `IsValuativeTopology F ∧ IsNontrivial F ∧ DiscreteTopology F` is not possible if `F` is a field. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	172/0	Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean	2	14	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	218-48164 7 months ago	218-48165 218 days ago	67-79609 67 days
28243	robin-carlier author:robin-carlier	chore(CategoryTheory/Bicategory): move some `eqToHom` lemmas	The file `CategoryTheory/Bicategory/EqToHom.lean` introduced in #28242 is a more suitable hom for the lemmas `CategoryTheory.Bicategory.whiskerLeft_eqToHom` and `CategoryTheory.Bicategory.eqToHom_whiskerRight` than the current `CategoryTheory/Bicategory/Strict.lean`. We move these lemmas to the new file, and make `CategoryTheory/Bicategory/Strict` import these lemmas. --- - [x] depends on: #28242 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	165/23	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	5	9	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	218-44902 7 months ago	228-32832 228 days ago	0-9063 2 hours
26913	Paul-Lez author:Paul-Lez	feat(NumberTheory/{*}): add a few lemmas about number field and cyclotomic extensions	The motivation for this PR is that the main statement in [this PR](https://github.com/google-deepmind/formal-conjectures/pull/297) shouldn't need to assume `p` has type `PNat` for the instances to work. This is still WIP as I need to clean up (currently waiting on the build!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-number-theory t-algebra awaiting-CI merge-conflict label:t-algebra$	52/0	Mathlib/NumberTheory/ClassNumber/Temporary.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	215-49740 7 months ago	314-24114 314 days ago	0-28 28 seconds
27302	tristan-f-r author:tristan-f-r	feat(Fintype/Quotient): finLiftOn₂	The combination of [`Quotient.finLiftOn`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Fintype/Quotient.html#Quotient.finLiftOn) and [`liftOn₂`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Quotient.liftOn%E2%82%82). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	19/0	Mathlib/Data/Fintype/Quotient.lean	1	12	['github-actions', 'kckennylau', 'pechersky', 'tristan-f-r', 'vihdzp']	pechersky assignee:pechersky	214-86096 7 months ago	214-86096 214 days ago	6-5358 6 days
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed awaiting-zulip	0/564	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombination'.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination'.lean	5	4	['euprunin', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	214-81172 7 months ago	266-26569 266 days ago	0-1 1 second
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order delegated easy	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	214-33321 7 months ago	235-65411 235 days ago	3-79002 3 days
19616	adamtopaz author:adamtopaz	fix: fix the definition of the absolute Galois group of a field	Previously it was defined as the Galois group of the algebraic closure, as opposed to the separable closure. Also, this adds some missing instances for this group. Still missing is compactness, but that seems like a bigger project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	23/8	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/FieldTheory/KrullTopology.lean	2	4	['acmepjz', 'alreadydone', 'github-actions']	nobody	212-74943 7 months ago	531-53439 531 days ago	3-64280 3 days
28826	alreadydone author:alreadydone	feat(CategoryTheory): Additive and Linear when Hom types are only monoids	+ introduce Presemiadditive categories, which generalizes Preadditive categories: the Hom sets are commutative monoids rather than groups, and `comp_zero` and `zero_comp` is no longer automatic. The new file Preadditive/Semi.lean is adapted from Preadditive/Basic.lean, though many contents can't be generalized. + generalize Functor.Additive and Functor.Linear to take Presemiadditive categories instead. The former needs a `map_zero` field since it's not automatic for Presemiadditive categories. + introduce SemimoduleCat, the category of semimodules (mathlib's Module) over a Semiring. The new file ModuleCat/Semi.lean is copied from ModuleCat/Basic.lean. TODOs: additive/linear equivalence between SemimoduleCat and ModuleCat and use it to transfer results; monoidal structure on SemimoduleCat; change `CommRing.Pic` to use SemimoduleCat. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory awaiting-CI	978/123	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/MonCat/Presemiadditive.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/CategoryTheory/Preadditive/Semi.lean	9	4	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	212-68728 7 months ago	268-17173 268 days ago	0-1 1 second
16428	astrainfinita author:astrainfinita	test use `QuotLike` APIs	--- - [ ] depends on: #16421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	1501/564	Mathlib.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/CategoryTheory/IsomorphismClasses.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Functor.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/QuotLike.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/Topology/Inseparable.lean,test/QuotLike.lean	43	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	211-83307 6 months ago	unknown	0-0 0 seconds
16210	astrainfinita author:astrainfinita	Clean up quotient APIs	~~We may migrate to `Quot` and `IsEquiv` APIs in the future, but it might be a good start to clean up `Quotient` APIs anyway.~~ The diffs in this PR did not include `QuotLike` APIs, but eventually I decided to migrate to `QuotLike` before deprecating some old APIs. This is because some lemmas don't have alternatives that don't use `· ≈ ·`, and the alternatives that use `· ≈ ·` are in the core. See [Zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/.60.28.C2.B7.20.E2.89.88.20.C2.B7.29.60.20in.20.60Quotient.60.20APIs/near/466970386). --- - [x] depends on: #16254 - [x] depends on: #16256 - [x] depends on: #16258 - [x] depends on: #16260 - [x] depends on: #16264 - [x] depends on: #16267 - [ ] depends on: #16314 - [x] depends on: #16410 - [x] depends on: #17588 - [x] depends on: #17594 - [x] depends on: #17940 - [ ] depends on: #17941 --- `QuotLike` - [ ] depends on: #16421 - [ ] depends on: #16428 --- [remaining diffs](https://github.com/leanprover-community/mathlib4/compare/FR_quot_now..FR_quot) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict tech debt blocked-by-other-PR t-data	1015/1114	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/CharZero/Quotient.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Kernels.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Quiver/ConnectedComponent.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Countable/Defs.lean,Mathlib/Data/FinEnum.lean,Mathlib/Data/Finite/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Abelianization.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/DoubleCoset.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/QuotientPi.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Group/FundamentalDomain.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	134	6	['astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	211-83306 6 months ago	unknown	0-0 0 seconds
30642	thorimur author:thorimur	bench: lean4#10832		merge-conflict large-import	507/460	.github/workflows/nightly-docgen.yml,Cache/IO.lean,Mathlib.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Finset/Attach.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Int/LeastGreatest.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/Triplewise.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/String/Basic.lean,Mathlib/Data/String/Defs.lean,Mathlib/Data/String/Lemmas.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferentiationThm.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/SetTheory/PGame/Basic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/DeclarationNames.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Says.lean,Mathlib/Tactic/SuccessIfFailWithMsg.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/ToAdditive/GuessName.lean,Mathlib/Tactic/ToExpr.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Tactic/Widget/SelectPanelUtils.lean,Mathlib/Util/CompileInductive.lean,Mathlib/Util/Superscript.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/Simps.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Util/PrintSorries.lean,MathlibTest/Variable.lean,MathlibTest/fast_instance.lean,MathlibTest/grind/pairwise_disjoint.lean,MathlibTest/hint.lean,MathlibTest/propose.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/says_whitespace.lean,MathlibTest/success_if_fail_with_msg.lean,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain,scripts/check-yaml.lean,scripts/noshake.json	92	4	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	211-43117 6 months ago	unknown	0-0 0 seconds
30643	thorimur author:thorimur	bench: before lean4#10832		merge-conflict large-import	507/460	.github/workflows/nightly-docgen.yml,Cache/IO.lean,Mathlib.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Finset/Attach.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Int/LeastGreatest.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/Triplewise.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/String/Basic.lean,Mathlib/Data/String/Defs.lean,Mathlib/Data/String/Lemmas.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferentiationThm.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/SetTheory/PGame/Basic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/DeclarationNames.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Says.lean,Mathlib/Tactic/SuccessIfFailWithMsg.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Tactic/ToAdditive/GuessName.lean,Mathlib/Tactic/ToExpr.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Tactic/Widget/SelectPanelUtils.lean,Mathlib/Util/CompileInductive.lean,Mathlib/Util/Superscript.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/Change.lean,MathlibTest/DeprecateTo.lean,MathlibTest/FieldSimp.lean,MathlibTest/FindSyntax.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/LibrarySearch/basic.lean,MathlibTest/LibrarySearch/mathlib.lean,MathlibTest/LibrarySearch/observe.lean,MathlibTest/Simps.lean,MathlibTest/Subsingleton.lean,MathlibTest/Use.lean,MathlibTest/Util/PrintSorries.lean,MathlibTest/Variable.lean,MathlibTest/fast_instance.lean,MathlibTest/grind/pairwise_disjoint.lean,MathlibTest/hint.lean,MathlibTest/propose.lean,MathlibTest/rewrites.lean,MathlibTest/ring.lean,MathlibTest/says.lean,MathlibTest/says_whitespace.lean,MathlibTest/success_if_fail_with_msg.lean,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain,scripts/check-yaml.lean,scripts/noshake.json	92	4	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	211-43116 6 months ago	unknown	0-0 0 seconds
26291	RemyDegenne author:RemyDegenne	feat(Probability): Cameron-Martin theorem	- Definition of the Cameron-Martin space of a Gaussian measure - The Cameron-Martin theorem: shifting a Gaussian measure by an element of the Cameron-Martin space gives an equivalent measure, and shifting by an element which is not in the Cameron-Martin space gives a mutually singular measure. --- - [x] depends on: #24975 - [x] depends on: #24969 - [x] depends on: #24930 - [x] depends on: #24925 - [x] depends on: #24900 - [x] depends on: #25532 - [x] depends on: #27022 - [x] depends on: #27027 - [x] depends on: #27029 - [x] depends on: #27123 - [x] depends on: #27610 - [x] depends on: #28342 - [x] depends on: #28343 - [x] depends on: #30167 - [x] depends on: #30346 - [x] depends on: #30348 - [ ] depends on: #30582 - [x] depends on: #31551 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24430. Original PR: https://github.com/leanprover-community/mathlib4/pull/24430	WIP blocked-by-other-PR t-measure-probability merge-conflict	1963/13	Mathlib.lean,Mathlib/Probability/Distributions/Gaussian/CameronMartin.lean,Mathlib/Probability/Distributions/Gaussian/CameronMartinThm.lean,Mathlib/Probability/Distributions/Gaussian/CompletionResultsToBeMoved.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean,docs/1000.yaml	14	13	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	210-53706 6 months ago	329-73098 329 days ago	0-2 2 seconds
30460	janithamalith author:janithamalith	feat(Nat): add lemma nat_card_orbit_mul_card_stabilizer_eq_card_group	Added a lemma `nat_card_orbit_mul_card_stabilizer_eq_card_group` which is the Nat.card version of MulAction.card_orbit_mul_card_stabilizer_eq_card_group --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-group-theory new-contributor	6/0	Mathlib/GroupTheory/GroupAction/CardCommute.lean	1	17	['github-actions', 'kckennylau', 'plp127', 'tb65536']	tb65536 assignee:tb65536	210-52203 6 months ago	210-52203 210 days ago	8-8414 8 days
25737	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_δ`s	We prove that admissible lists indeed provide a normal form for morphisms of satisfying `P_δ`. To this end, we introduce `standardδ`, a construction that takes a list and turn it into a composition of `δ i`s in `SimplexCategoryGenRel`. We then prove that, thanks to the first simplicial identity, composition on the left corresponds to simplicial insertion in the list. This gives existence of a normal form for every morphism satisfying `P_δ`. For unicity, we introduce an auxiliary function `simplicialEvalδ : (List ℕ) → ℕ → ℕ` and show that for admissible lists, it lifts to `ℕ` the `orderHom` attached to `toSimplexCategory.map standardδ`, and that we can recover elements of the list only by looking at values of this function. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [x] depends on: #25736 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21746. Original PR: https://github.com/leanprover-community/mathlib4/pull/21746	t-algebraic-topology delegated t-category-theory	182/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	209-52991 6 months ago	210-44707 210 days ago	0-22513 6 hours
30209	Ruben-VandeVelde author:Ruben-VandeVelde	feat: some TwoSidedIdeal.span lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory FLT	16/0	Mathlib/RingTheory/TwoSidedIdeal/Operations.lean	1	2	['erdOne', 'github-actions']	erdOne assignee:erdOne	209-23497 6 months ago	209-23497 209 days ago	17-9153 17 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	6	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	209-15735 6 months ago	209-15735 209 days ago	148-3286 148 days
27206	grhkm21 author:grhkm21	feat(CategoryTheory/Adjunction): partial adjoints are adjoints	Partial adjunctions `F.partial{Left,Right}Adjunction` are adjunctions when fully defined i.e. `F.{left,right}AdjointObjIsDefined = ⊤`.	awaiting-author t-category-theory	48/2	Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean	1	1	['github-actions']	nobody	208-47971 6 months ago	306-60176 306 days ago	0-53 53 seconds
27196	YaelDillies author:YaelDillies	refactor(Polynomial/Bivariate): swap `X` and `Y` for improved notation	This way, `X` keeps on being `X`. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra toric label:t-algebra$	3/3	Mathlib/Algebra/Polynomial/Bivariate.lean	1	7	['YaelDillies', 'alreadydone', 'github-actions', 'kckennylau']	nobody	208-41524 6 months ago	290-78635 290 days ago	15-75841 15 days
24532	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): fill out the `FreeProduct.asPowers` namespace	* Replicate the existing API for `LinearAlgebra.FreeProduct` under `FreeProduct.asPowers`, for convenience when working primarily with the power algebra representation * Adds convenience lemmas for using the corresponding quotient relation `rel'` (used in the above). --- - [x] depends on: #24531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	122/5	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	26	['YaelDillies', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robertmaxton42']	nobody	208-5585 6 months ago	372-79416 372 days ago	0-47665 13 hours
27683	dupuisf author:dupuisf	feat: grind tags for set operations	This PR adds `grind` tags for various set operations (union, intersection, complement, etc). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	29/9	Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Operations.lean	2	5	['dupuisf', 'euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	207-43274 6 months ago	292-52586 292 days ago	0-292 4 minutes
30828	DeVilhena-Paulo author:DeVilhena-Paulo	feat: implementation of `Finmap.merge`	The main contribution of this pull request is the implementation of a `merge` function for finite maps (`Finmap`). The construction relies on the definition of a `merge` function for association lists (`AList`). There is also a side (unrelated) contribution on `Mathlib/Data/List/Permutation.lean`: the addition of a theorem about the permutation of a list with a head element (that is, a list of the form `a :: l`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	449/3	Mathlib/Data/Finmap.lean,Mathlib/Data/List/AList.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/List/Sigma.lean	4	1	['github-actions']	nobody	207-39167 6 months ago	207-39238 207 days ago	0-80 1 minute
29355	girving author:girving	feat(Trigonometric): Taylor series bounds for sin and cos	Zulip discussion here: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Better.20.60Real.2Esin.60.20bounds/near/535035576 We also include the full set of intervals on which sin and cos are monotone/antitone. --- Questions to resolve as part of review: 1. I've left the `Finset.sum_range_even` in the new `SeriesBounds` file, but presumably it should go somewhere else (unless you want me to inline it, but that seems worse). 2. Is putting the new Taylor series bounds in a new `SeriesBounds` file right, or should it go in the current `Bounds.lean` file? When I started writing the PR I thought the new bounds would need more imports via more analysis, but it turns out the only new import needed would be `Mathlib.Algebra.BigOperators.Field` which seems lightweight. I am happy with whatever the preference is in terms of file structure. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	158/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/SeriesBounds.lean	4	28	['Parcly-Taxel', 'Ruben-VandeVelde', 'adomani', 'girving', 'github-actions', 'llllvvuu', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	207-34657 6 months ago	255-34446 255 days ago	0-76697 21 hours
28298	thorimur author:thorimur	chore: dedent `to_additive` docstrings	This PR uses automation to dedent `to_additive` docstrings throughout Mathlib. It does not lint against indentation or in any way enforce indentation standards for future docstrings. The convention was chosen in accordance with the discussion and polls at [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Poll.3A.20Indentation.20style.20for.20.60to_additive.60.20docstrings/with/534285603). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict documentation awaiting-author	949/949	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Ulift.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Pi.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Embedding.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Equiv/Opposite.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/Units/Opposite.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Submonoid.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/Units.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Set/MulAntidiagonal.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/FixedPoints/Prufer.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coprod/Basic.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Divisible.lean,Mathlib/GroupTheory/EckmannHilton.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean	141	11	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	204-69239 6 months ago	278-35064 278 days ago	0-46097 12 hours
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	merge-conflict awaiting-author t-algebra label:t-algebra$	67/77	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	26	20	['Vierkantor', 'alreadydone', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	202-71654 6 months ago	266-31827 266 days ago	2-39213 2 days
28676	sun123zxy author:sun123zxy	feat(NumberTheory/ArithmeticFunction): wrap `Nat.totient` as an `ArithmeticFunction`	This wraps the Euler's totient function `Nat.totient` into a new `ArithmeticFunction` `ϕ`, with some basic identities such as `ϕ * ζ = id` and `μ * id = ϕ.` --- We use the notation `ϕ` to distinguish from `Nat.totient`'s notation `φ`, however this might be controversial. Suggestions are welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import merge-conflict awaiting-author	45/5	Mathlib/NumberTheory/ArithmeticFunction.lean	1	19	['MichaelStollBayreuth', 'SnirBroshi', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'sun123zxy']	MichaelStollBayreuth assignee:MichaelStollBayreuth	202-71606 6 months ago	218-46282 218 days ago	47-58311 47 days
30299	franv314 author:franv314	feat(Topology/Instances): Cantor set	Prove that the Cantor set has empty interior and the cardinality of the continuum as discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20few.20results.20about.20the.20Cantor.20set/with/543560670) Moves: - Mathlib.Topology.Instances.CantorSet -> Mathlib.Topology.Instances.CantorSet.Basic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict file-removed awaiting-author t-topology	355/2	Mathlib.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean	4	5	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	202-63336 6 months ago	223-45965 223 days ago	0-2409 40 minutes
30303	franv314 author:franv314	chore(Topology/Instances): add deprecated module	Add deprecated module to moved Cantor set file. --- - [ ] depends on: #30299 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor	486/124	Mathlib.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/Instances/CantorSet/Basic.lean,Mathlib/Topology/Instances/CantorSet/Cardinality.lean,Mathlib/Topology/Instances/CantorSet/Lemmas.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	202-63334 6 months ago	223-43834 223 days ago	0-340 5 minutes
30575	urkud author:urkud	feat: lemmas about `_ • _` on Filters	as well as `Set.Finite.f?derivWithin_eq`. I wrote these lemmas for #24019, but the final version of that PR doesn't need them. I moved them here so that I don't forget to prepare a non-draft PR with these lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	51/0	Mathlib/Topology/TODO.lean	1	3	['github-actions', 'plp127', 'urkud']	nobody	202-42502 6 months ago	unknown	0-0 0 seconds
27976	smmercuri author:smmercuri	feat: `ramificationIdx` for `NumberField.InfinitePlace`	This PR continues the work from #24884. Original PR: https://github.com/leanprover-community/mathlib4/pull/24884	merge-conflict WIP t-number-theory	22/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	201-49176 6 months ago	286-65161 286 days ago	0-57 57 seconds
26357	javra author:javra	feat(CategoryTheory): linear categories as `ModuleCat R`-enriched categories	Continues #23826. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory large-import	197/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/CategoryTheory/Enriched/Linear.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Monoidal/Linear.lean	5	10	['adamtopaz', 'github-actions', 'javra', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	200-7771 6 months ago	244-34424 244 days ago	78-29556 78 days
26085	grunweg author:grunweg	feat: disjoint unions distribute with products of manifolds	This PR continues the work from #22611. Original PR: https://github.com/leanprover-community/mathlib4/pull/22611	please-adopt WIP t-differential-geometry merge-conflict	75/6	Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	199-66174 6 months ago	334-56976 334 days ago	0-74 1 minute
27180	ADedecker author:ADedecker	feat: quotient of a monoid with zero by a multiplicative congruence	--- My motivation is getting a more conceptual construction of [ValuativeRel.ValueGroupWithZero](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Valuation/ValuativeRel.html#ValuativeRel.ValueGroupWithZero), but I think this is of independent interest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra delegated label:t-algebra$	141/26	Mathlib.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/GroupWithZero.lean	5	32	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	199-54910 6 months ago	278-70445 278 days ago	28-12053 28 days
29570	eric-wieser author:eric-wieser	fix: substitute infotrees in linters	I don't know whether this is necessary in these particular cases, but I've seen places where it is. There are a handful more of these cases in Batteries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2/2	Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/TacticAnalysis.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	199-51411 6 months ago	unknown	0-0 0 seconds
30790	urkud author:urkud	chore: partially migrate from `ContinuousMap.continuous`	... to `map_continuous` or `by fun_prop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	37/45	Mathlib/AlgebraicGeometry/Morphisms/Constructors.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Restrict.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Condensed/TopComparison.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/Topology/Category/CompHausLike/Limits.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean,Mathlib/Topology/ContinuousMap/Units.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/PartitionOfUnity.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/TietzeExtension.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Dini.lean,Mathlib/Topology/UrysohnsLemma.lean	24	6	['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	199-50714 6 months ago	208-37496 208 days ago	0-12151 3 hours
30631	ADedecker author:ADedecker	refactor: evaluation of power series in semirings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		665/71	Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/RingTheory/MvPowerSeries/EvaluationSemi.lean,Mathlib/Topology/Algebra/LinearTopology.lean,Mathlib/Topology/Algebra/LinearUniformity.lean,Mathlib/Topology/Algebra/TopologicallyNilpotent.lean	5	1	['github-actions']	nobody	198-50664 6 months ago	unknown	0-0 0 seconds
29871	zach1502 author:zach1502	feat(Matrix/Transvection): Gauss pivot determinant identity and pivot preservation	This PR adds two lemmas formalizing standard Gaussian pivot identities: * `Matrix.Transvection.listTransvecCol_mul_mul_listTransvecRow_pivot`: After applying the canonical left/right transvection products that clear the last column and row, the pivot (bottom-right) entry of a matrix is unchanged. Marked `@[simp]`. * `Matrix.Transvection.det_eq_detTopLeft_mul_pivot`: If the pivot entry is nonzero, then the determinant of the matrix factors as the determinant of the top-left block times the pivot entry, after performing the canonical transvections. This is the usual Gauss–pivot determinant identity. * Added simple usage tests in `MathlibTest/matrix.lean` to check that the new lemmas are usable by `simp`/`simpa`. --- --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	94/0	Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean	2	3	['github-actions', 'riccardobrasca', 'zach1502']	nobody	196-62857 6 months ago	196-62857 196 days ago	41-53449 41 days
25692	Whysoserioushah author:Whysoserioushah	feat(RingTheory/MatrixAlgebra): add a more general version of `matrixEquivTensor`	This adds `tensorMatrixLinearEquiv : A ⊗[R] Matrix n n B ≃ₐ[S] Matrix n n (A ⊗[R] B)` which is a more general version of `matrixEquivTensor : Matrix n n A ≃ₐ[R] (A ⊗[R] Matrix n n R)`. The latter is then implemented as a trivial consequence of the former. Many internal implementation details are deleted without deprecation, although strictly these were not private. Co-authored-by: @erdOne Co-authored-by: Eric Wieser --- - [ ] depends on: #28367 - [ ] depends on: #28359 - [ ] depends on: #28368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	129/110	Mathlib/RingTheory/MatrixAlgebra.lean	1	28	['Whysoserioushah', 'chrisflav', 'eric-wieser', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	chrisflav assignee:chrisflav	196-50434 6 months ago	272-73330 272 days ago	47-13209 47 days
25012	urkud author:urkud	refactor(*): migrate from `Matrix.toLin'` to `Matrix.mulVecLin`	or `Matrix.mulVec` whenever we don't need the `LinearEquiv.symm` part. See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.2EtoLin'.20vs.20Matrix.2EmulVecLin/with/515188548). It makes sense to have only one normal form, and `Matrix.toLin'` has an extra `DecidableEq` assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	165/126	Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/ToLinearEquiv.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean	19	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	196-32835 6 months ago	344-58313 344 days ago	14-81673 14 days
29638	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory): define descent data by presieves	--- Addendum: I realized that there is prior work in #24434. Since this PR uses a slightly different definition, I plan to make this PR a follow-up to #24434. Until then, I’ll keep it marked as WIP. See the comment: https://github.com/leanprover-community/mathlib4/pull/29638#issuecomment-3290041719 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	408/2	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Stack/Basic.lean,Mathlib/CategoryTheory/Stack/Descent.lean	6	7	['chrisflav', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'yuma-mizuno']	nobody	196-28932 6 months ago	246-59282 246 days ago	0-74 1 minute
30158	nicolaviolette author:nicolaviolette	feat: combinatorics simplegraph basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	9/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	3	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	195-82387 6 months ago	195-82387 195 days ago	31-69826 31 days
28132	dupuisf author:dupuisf	feat: preliminary `grind` tags for `IsUnit`	This PR adds preliminary `grind` tags for the `IsUnit` predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	61/17	Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Ring/Units.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean	6	3	['github-actions', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	195-24762 6 months ago	195-24763 195 days ago	80-71575 80 days
25903	pfaffelh author:pfaffelh	feat(MeasureTheory): finite unions of sets in a semi-ring (in terms of measure theory) form a ring	: Finite unions of sets in a semi-ring (in terms of measure theory) form a ring The set containing finite unions of sets in a semi-ring are a ring. Part of `MeasureTheory.SetSemiring` is moved to the new file `MeasureTheory.SetRing`. --- - [ ] depends on: #25902 [contains changes in `SetSemiring` as well] --- This PR continues the work from #23117. Original PR: https://github.com/leanprover-community/mathlib4/pull/23117	merge-conflict blocked-by-other-PR large-import t-measure-probability	648/131	Mathlib.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Pi.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/MeasureTheory/SetRing.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ExtractLets.lean,lake-manifest.json,lakefile.lean	16	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	195-12474 6 months ago	273-23020 273 days ago	0-11144 3 hours
28863	yury-harmonic author:yury-harmonic	ignore: make CI build oleans	It looks like CI doesn't build oleans unless I open a PR. Or I can't see this workflow. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict large-import	624/100	Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Expand.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/ModEq.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Tactic/NormNum/Basic.lean,MathlibTest/norm_num_ext.lean	13	4	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	194-78885 6 months ago	unknown	0-0 0 seconds
29992	vlad902 author:vlad902	feat(Order): finite (Max)Chains always contains a top/max element	--- - [ ] depends on: #29835 [optional extra text] - [ ] depends on: #29993 [optional extra text] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order large-import	35/0	Mathlib/Order/Preorder/Chain.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	193-44566 6 months ago	234-76927 234 days ago	0-56 56 seconds
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	awaiting-CI new-contributor merge-conflict awaiting-author t-meta	198/0	Mathlib.lean,Mathlib/Tactic/Simproc/PolynomialDegree.lean,MathlibTest/polynomial_degree_simproc.lean	3	19	['5hv5hvnk', 'YaelDillies', 'adomani', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	193-42655 6 months ago	311-59649 311 days ago	2-71043 2 days
26391	grunweg author:grunweg	feat: immersed submanifolds	Still under construction --- - [ ] depends on: #26087 - [ ] depends on: #23040 Better version of #24549. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	1418/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	193-29415 6 months ago	unknown	0-0 0 seconds
31020	grunweg author:grunweg	feat: mfderiv of Sum.inl and Sum.inr	Nothing to see yet: waiting on the cache, then I will state the sorries and Newell Jansen has expressed interest in trying to prove this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	64/0	Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	1	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	193-28183 6 months ago	202-42662 202 days ago	0-1 1 second
31340	kim-em author:kim-em	feat: helper script to summarize CI errors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	235/0	scripts/README.md,scripts/failing_ci.py	2	1	['github-actions']	nobody	193-14337 6 months ago	unknown	0-0 0 seconds
25775	emilyriehl author:emilyriehl	feat(AlgebraicTopology/SimplicialSet/NerveAdjunction): to Strict Segal 2	Under a suitable hypothesis, a map of 2-truncated simplicial sets can be generated from a refl prefunctor between the underlying reflexive quivers --- provided the codomain is `StrictSegal`. This abstracts a previously formalized result that requires the codomain to be the 2-truncated nerve of a category. Co-authored-by: Aaron Liu --- The current draft displays the old code for comparison with new versions labeled ALT. After initial review this will be cut. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #23848. Original PR: https://github.com/leanprover-community/mathlib4/pull/23848	t-algebraic-topology t-category-theory merge-conflict awaiting-author infinity-cosmos	421/206	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/EqToHom.lean	7	38	['emilyriehl', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	190-43993 6 months ago	271-36719 271 days ago	17-16247 17 days
26827	pechersky author:pechersky	feat(Analysis/Normed/ValuativeRel): helper instance for NormedField	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26713 - [x] depends on: #26826	merge-conflict t-algebra t-number-theory t-analysis label:t-algebra$	211/27	Mathlib.lean,Mathlib/Analysis/Normed/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	34	['ADedecker', 'adamtopaz', 'erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	kbuzzard assignee:kbuzzard	187-53366 6 months ago	187-53366 187 days ago	122-64394 122 days
30150	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for MonoidalCategory	Add `AddMonoidalCategory`, the additive version of `MonoidalCategory`. To get this to work, I needed to _remove_ the `to_additive` attributes in `Discrete.lean`, since existing code relies on the `AddMonoid M → MonoidalCategory M` instance. For now, we simply implement the additive variants by hand instead. --- As discussed in #28718; I added an `AddMonoidalCategory` struct and tagged `MonoidalCategory` with `to_additive`, along with the lemmas in `Category.lean`. I think this is the right approach, since under this framework the "correct" additive version of `Discrete.lean` would be mapping an `AddMonoid` to an `AddMonoidalCategory`. Next steps would be to: - Make `monoidal_coherence` and `coherence` support `AddMonoidalCategory` - Add `CocartesianMonoidalCategory` extending `AddMonoidalCategory` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory large-import new-contributor merge-conflict awaiting-zulip t-meta	444/125	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	22	['JovanGerb', 'YaelDillies', 'github-actions', 'imbrem', 'mathlib4-merge-conflict-bot']	nobody	187-5646 6 months ago	226-70712 226 days ago	1-160 1 day
27135	JovanGerb author:JovanGerb	feat: `gconvert` tactic	The `gconvert` tactic calls `gcongr` internally, and it can be used as replacement/generalization of `peel`. One drawback is that `peel` can unfold definitions until they are a binder, while `gconvert` cannot, but I think this is acceptable. TODO: replace all uses of `peel` with either `gconvert` or `congr!` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	320/17	Mathlib/Tactic/GCongr/Core.lean,MathlibTest/GConvert.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	186-34791 6 months ago	308-49388 308 days ago	0-5 5 seconds
25765	JovanGerb author:JovanGerb	feat(gcongr): lemma for rewriting inside divisibility	TODO: add test to show that we can rewrite using `a ≡ b [ZMOD n]` inside `n ∣ 2 * a + 1`. edit: it's not yet entirely clear if this is the right thing to do. edit: This lemma should be written using iff (or =), so that we can use it specifically when rewriting with a symmetric relation. Supporting equality in `gcongr` is still work in progress. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated t-data	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	185-64912 6 months ago	339-51192 339 days ago	1-19951 1 day
30978	dagurtomas author:dagurtomas	Draft: adic spaces	--- This is work in progress, mostly ported from the perfectoid project [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict large-import	1407/45	Mathlib.lean,Mathlib/AdicSpace/AdicSpace.lean,Mathlib/AdicSpace/HuberPair.lean,Mathlib/AdicSpace/Spa/RationalOpenData.lean,Mathlib/AdicSpace/Spa/StalkValuation.lean,Mathlib/AdicSpace/Spa/StructurePresheaf.lean,Mathlib/AdicSpace/Spv.lean,Mathlib/Topology/Category/TopCommRingCat.lean	8	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	185-46345 6 months ago	203-39164 203 days ago	0-12 12 seconds
30824	grunweg author:grunweg	wip: another smoothness lemma for local frames	--- Can I prove in general that the coefficients of a smooth section w.r.t. a smooth local frame are smooth? This is certainly true for orthonormal frames... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry	57/9	Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean	1	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	184-34683 6 months ago	207-46160 207 days ago	0-6 6 seconds
30770	robertmaxton42 author:robertmaxton42	(WIP) Limits and Colimits in Quiv	WIP PR for the oleans --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	3652/31	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv.lean,Mathlib/CategoryTheory/Category/Quiv/AsFunctor/Defs.lean,Mathlib/CategoryTheory/Category/Quiv/Colimits.lean,Mathlib/CategoryTheory/Category/Quiv/Limits.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Filtered/Level.lean,Mathlib/CategoryTheory/Limits/Constructions/LimitsOfProductsAndEqualizers.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/FunctorToTypes.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Presheaf.lean,Mathlib/Combinatorics/Quiver/Shapes.lean,Mathlib/Combinatorics/Quiver/WalkingQuiver.lean,Mathlib/Data/ULift.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Sum.lean,Mathlib/Logic/Small/Defs.lean	23	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	183-5111 6 months ago	unknown	0-0 0 seconds
31593	Ruben-VandeVelde author:Ruben-VandeVelde	feat: some lemmas about MonoidAlgebra	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	26/0	Mathlib/Algebra/MonoidAlgebra/Basic.lean	1	5	['github-actions', 'mathlib4-merge-conflict-bot', 'robin-carlier', 'themathqueen']	nobody	182-85161 6 months ago	185-54421 185 days ago	0-85235 23 hours
26885	pechersky author:pechersky	feat(Topology/ValuativeRel): ValuativeTopology 𝒪[K]	and even when not a field, `ValuativeRel 𝒪[K]` This is an example of something achievable with the new declarations that wasn't possible with Valued Such that we can discuss the valuations on the subring without always using coercions But to achieve this, one needs some juggling of the value groups --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26834 - [ ] depends on : #30135	t-algebra t-number-theory t-topology label:t-algebra$	66/0	Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	1	10	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	alreadydone assignee:alreadydone	182-37907 6 months ago	182-50927 182 days ago	131-51114 131 days
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	307/5	Mathlib/Computability/NFA.lean	1	27	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	182-22778 6 months ago	601-50166 601 days ago	45-84611 45 days
12032	mcdoll author:mcdoll	feat: delta distribution as a limit	--- - [ ] depends on: #11496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	58/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	182-5752 6 months ago	769-50318 769 days ago	0-1 1 second
9693	madvorak author:madvorak	feat: Linear programming in the standard form	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) - [x] depends on: #9652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/LinearProgramming.lean	2	15	['apurvanakade', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	181-56524 6 months ago	684-64516 684 days ago	168-78821 168 days
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711']	nobody	181-39019 6 months ago	527-2549 527 days ago	23-54870 23 days
4786	thorimur author:thorimur	feat: AppBuilder utils	This supplements `Lean.Meta.AppBuilder`, introducing variants of `mkAppN` and `mkAppM` which allow for more fine-grained management of existing and created metavariables. [Description pending] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	205/0	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean	2	1	['mathlib4-merge-conflict-bot']	nobody	180-76879 5 months ago	unknown	0-0 0 seconds
5745	alexjbest author:alexjbest	feat: a tactic to consume type annotations, and make constructor nicer	During the copenhagen masterclass I found some situations where applying the constructor tactic left the goal in a difficult to read state when autoParams were present. We add a simple tactic to clean these up, and a macro for `constructor` to behave more like the constructor notation and do this automatically (constructor is in core) It seems that these things should be cleaned up by simp, but a simp lemma to remove these annotations is not accepted by lean as the types are too similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	41/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Consume.lean,test/consume.lean	4	5	['alexjbest', 'digama0', 'kim-em', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76878 5 months ago	996-13340 996 days ago	51-33889 51 days
5863	eric-wieser author:eric-wieser	feat: add elaborators for concrete matrices	--- - [x] depends on: #5866 - [ ] depends on: #5897 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted blocked-by-other-PR t-meta	257/7	Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Matrix/Auto.lean,MathlibTest/matrix_auto.lean	3	8	['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-76877 5 months ago	1040-56538 1040 days ago	0-1 1 second
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor merge-conflict help-wanted t-analysis	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	7	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	MithicSpirit assignee:MithicSpirit	180-76876 5 months ago	864-15371 864 days ago	0-433 7 minutes
7386	madvorak author:madvorak	feat: Define linear programs	Linear programs over a general `Module` with constraints given in the form "aᵀx - b ≥ 0" and the objective function as an `AffineMap` to be minimized. --- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	87/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	64	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	180-76873 5 months ago	684-64504 684 days ago	232-74885 232 days
7890	grhkm21 author:grhkm21	feat(Mathlib/Tactic/Setm): implement setm tactic	This is my first time doing metaprogramming in Lean 4, please provide feedback when you have them :) The `setm` tactic, which stands for `set` + matching, matches a given expression with the goal and introduces new local hypotheses for the named holes specified. One of the best usage is for rearrangement proofs. As a simple example, ```lean example : (1 + 1) + (4 * 3) - (1 + 1) = (3 * 4 : Rat) := by setm ?A + ?B - ?A = (?C : Rat) rw [show ∀ A B, A + B - A = B by intro A B ; ring_nf ] apply Rat.mul_comm ``` One can imagine replacing the three term expression with a 7 term algebraic expression. This was developed with tons of help from [Zulip](https://leanprover.zulipchat.com/#narrow/stream/239415-metaprogramming-.2F-tactics/topic/Help.20with.20writing.20tactic), especially from Thomas. Thanks! TODO: - [X] Support `setm ... at ...` syntax, see example 1 below - [X] Write docs - [ ] Use `withNewMCtxDepth` - [X] Rename the intermediate `MVar`s, see example 2 below - [ ] Use `elabTermWithHolesPostponing` in conjunction with `Term.synthesizeSyntheticMVarsNoPostPoning` after `isDefEq` to handle instances Example 1: ```lean /- Usage with `using` and `at` keywords -/ example (h1 : 1 + 1 = 3) (h2 : 1 + 3 = 5) (h3 : 2 + 2 = 5) : true := by setm ?A + _ = (?B : Nat) using h2 at h1 h2 h3 guard_hyp A := 1 guard_hyp B := 5 guard_hyp h1 : A + A = 3 guard_hyp h2 : A + 3 = B guard_hyp h3 : 2 + 2 = B trivial ``` Example 2: ```lean /- Test reusing named holes -/ example (h : b + a = c) : a + b = c := by /- setm 1-/ setm ?A + ?B = (_ : Nat) guard_hyp A := a guard_hyp B := b /- clean up -/ unfold_let A B clear hA hB A B /- setm 2 -/ rewrite [Nat.add_comm] setm ?A + ?B = (_ : Nat) at h ⊢ guard_hyp A := b guard_hyp B := a exact h ``` Co-authored-by: Jireh Loreaux [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	141/0	Mathlib.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Setm.lean,test/Setm.lean	4	4	['mathlib4-merge-conflict-bot', 'thorimur']	nobody	180-76872 5 months ago	937-76648 937 days ago	0-104 1 minute
9352	chenyili0818 author:chenyili0818	feat: arithmetic lemmas for `gradient`	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties Co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	31	['chenyili0818', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'winstonyin']	nobody	180-76748 5 months ago	818-55197 818 days ago	52-1358 52 days
9795	sinhp author:sinhp	feat: the type `Fib` of fibre of a function at a point	This is the most basic file of the theory of fibred categories developed here: https://github.com/sinhp/LeanFibredCategories/tree/master --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	74/0	Mathlib.lean,Mathlib/Data/Fiber.lean	2	18	['adri326', 'joelriou', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	180-76747 5 months ago	850-72918 850 days ago	2-35530 2 days
10660	eric-wieser author:eric-wieser	feat(LinearAlgebra/CliffordAlgebra): construction from a basis	This is adapted from https://github.com/eric-wieser/lftcm2023-clifford_algebra, which only worked for the special case of `Q = 0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-algebra label:t-algebra$	573/0	Mathlib.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basis.lean	2	16	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76743 5 months ago	unknown	0-0 0 seconds
10977	grunweg author:grunweg	feat: germs of smooth functions	Define the space of germs of smooth functions (between manifolds). Endow it with a ring structure if the target manifold is a smooth ring (e.g., a Lie group or a field). From the sphere eversion project, rewritten by me. Co-authored-by: Patrick Massot ------- Particular questions for review - is the authorship/copyright information appropriate? (`PatrickMassot` created the file `SmoothGerm` which I adapted; I didn't trace this far back through sphere-eversion.) - is providing all the intermediate algebraic structures (such as, an additive subgroup) on the space of smooth germs useful in practice? (The sphere eversion project only needs a ring structure.) - any further particular API lemmas (e.g., around coercions) which would be good to add? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author t-topology t-analysis	150/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothGerm.lean	2	34	['YaelDillies', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'mathlib4-merge-conflict-bot', 'mcdoll']	fpvandoorn assignee:fpvandoorn	180-76742 5 months ago	629-52377 629 days ago	144-63944 144 days
10998	hmonroe author:hmonroe	feat(Logic): Arithmetization of partial recursive functions (toward Gödel's first incompleteness theorem)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	364/0	Mathlib.lean,Mathlib/Logic/Godel/PartArith.lean	2	4	['Ruben-VandeVelde', 'YaelDillies', 'mathlib4-merge-conflict-bot']	nobody	180-76741 5 months ago	711-45269 711 days ago	99-83915 99 days
11890	adomani author:adomani	feat: the terminal refine linter	A linter that warns on usages of `refine` and `refine'` as a finishing tactic. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Usage.20of.20refine'). ### Conclusion of the experiment Systematic replacements of terminal `refine` with `exact` leads to an overall slow-down. --- - [ ] depends on: #15616 (disable the linter in downstream projects) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	15	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	180-76617 5 months ago	643-24723 643 days ago	18-28993 18 days
11991	adomani author:adomani	draft: syntax data linter	A linter that prints `SyntaxNodeKind`s and `Range`s for all the nodes of a command. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/undocumented.20things). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	152/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SyntaxDataLinter.lean	3	1	['mathlib4-merge-conflict-bot']	nobody	180-76616 5 months ago	unknown	0-0 0 seconds
12006	adomani author:adomani	feat: the `suffa` tactic	The `suffa` tactic. `suffa tac` runs the tactic sequence `tac` and returns a `Try this:` suggestion of the form `suffices [target_after_tac] by tac; assumption`. For example ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffa rewrite [Nat.zero_add] assumption ``` suggests the replacement ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffices m = n by rewrite [Nat.zero_add] assumption assumption ``` See [this thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Try.20this.3A.20suffices.20simpa) as well as [this message](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2311822.20flexible.20tactics.20linter/near/431895664). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	161/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Suffa.lean,test/Suffa.lean	4	4	['MoritzBeroRoos', 'YaelDillies', 'mathlib4-merge-conflict-bot']	nobody	180-76614 5 months ago	711-61992 711 days ago	59-762 59 days
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict modifies-tactic-syntax awaiting-author help-wanted t-meta	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	11	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	180-76612 5 months ago	630-68698 630 days ago	0-16 16 seconds
14237	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`. Part 4 is available here: #14242 - [x] depends on: #14099 Part 1 - [x] depends on: #14216 Part 2 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	22	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	180-76610 5 months ago	629-50433 629 days ago	6-3525 6 days
14345	digama0 author:digama0	feat: the Dialectica category is monoidal closed	- [x] depends on: #14274 The monoidal closed structure of the Dialectica category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	252/0	Mathlib.lean,Mathlib/CategoryTheory/Dialectica/Closed.lean	2	4	['github-actions', 'kim-em', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76487 5 months ago	672-42041 672 days ago	12-20456 12 days
14727	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a flat module has vanishing higher Tor groups	[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	37/1	Mathlib/RingTheory/Flat/CategoryTheory.lean	1	4	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76485 5 months ago	670-24086 670 days ago	3-28223 3 days
14733	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a module is flat iff tensoring preserves finite limits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	99/1	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/RightExact.lean,Mathlib/RingTheory/Flat/CategoryTheory.lean	4	3	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76483 5 months ago	667-35947 667 days ago	6-6256 6 days
15055	sinhp author:sinhp	feat: the category of pointed objects of a concrete category	This file defines the category of pointed objects of a concrete category. After this we will have the categories of pointed groups, pointed abelian groups, pointed groupoids, etc. To define `Pointed.functor`, we need to add the following "pullback" construction to the category of elements. ``` @[simps obj map] def pullback (F : D ⥤ Type w) (G : C ⥤ D) : (G ⋙ F).Elements ⥤ F.Elements where obj X := ⟨G.obj X.1, X.2⟩ map {X Y} f := ⟨G.map f.1, f.2⟩ ``` This is called pullback since the display map of `G ⋙ F` (i.e. `π (G ⋙ F)`) is a pullback of the display map of `F`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	185/0	Mathlib.lean,Mathlib/CategoryTheory/ConcreteCategory/Pointed.lean,Mathlib/CategoryTheory/Elements.lean	3	14	['dagurtomas', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76482 5 months ago	656-61824 656 days ago	7-80557 7 days
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	21	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	180-76481 5 months ago	656-42712 656 days ago	1-48443 1 day
15453	tomaz1502 author:tomaz1502	Track formalization of runtime complexity	I finished porting https://github.com/leanprover-community/mathlib3/pull/14494/ to Lean 4 and made several small PRs, as suggested. This meta PR is used to track the progress of the smaller PRs. ## Pending PRs - [Formalization of List.insertionSort](https://github.com/leanprover-community/mathlib4/pull/15449) - [Lemmas about Split](https://github.com/leanprover-community/mathlib4/pull/15450) - [Formalization of List.merge](https://github.com/leanprover-community/mathlib4/pull/15451) - [Formalization of List.mergeSort](https://github.com/leanprover-community/mathlib4/pull/15452) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	525/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	5	['joneugster', 'mathlib4-merge-conflict-bot', 'mergify']	nobody	180-76479 5 months ago	642-68369 642 days ago	11-43846 11 days
16303	grunweg author:grunweg	feat(CI): check for badly formatted titles or missing/contradictory labels	--- The zulip workflow is entirely cargo-culted from #16296; please review carefully. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	325/0	.github/build.in.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,MathlibTest/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean	8	45	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	180-76477 5 months ago	499-25570 499 days ago	78-4556 78 days
17587	kmill author:kmill	feat: Sym2-as-Finset theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	105/3	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/RingTheory/Polynomial/Vieta.lean	4	11	['FordUniver', 'YaelDillies', 'github-actions', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76327 5 months ago	unknown	0-0 0 seconds
18236	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): the endofunctor of presheaves of modules induced by an oplax natural transformation	An endomorphism of ` ModuleCat.restrictScalarsPseudofunctor`, i.e. a "compatible" family of functors `ModuleCat A ⥤ ModuleCat A` for all (commutative) rings `A` induces a functor `PresheafOfModules R ⥤ PresheafOfModules R` for any presheaf of (commutative) rings `R`. In #18262, this is applied to the construction of exterior powers of a presheaves of modules. --- - [x] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory awaiting-CI merge-conflict awaiting-author label:t-algebra$	180/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean	2	6	['github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76326 5 months ago	unknown	0-0 0 seconds
18630	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.mergeSort	This PR adds the formalization of the runtime complexity of the merge sort algorithm, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15451 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability new-contributor	526/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean,Mathlib/Computability/Timed/MergeSort.lean,Mathlib/Computability/Timed/Split.lean	5	9	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76325 5 months ago	559-41728 559 days ago	0-77273 21 hours
18749	GabinKolly author:GabinKolly	feat(ModelTheory): preparatory work for the existence of Fraïsse limits	Define the map of a PartialEquiv through an embedding, and related properties. Define embeddings and equivalences between equal structures or equal substructures, and related properties. Add miscellaneous lemmas which will be used to prove the existence of fraisse limits. --- This is preparation for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	308/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	5	10	['GabinKolly', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	180-76323 5 months ago	483-38883 483 days ago	73-63475 73 days
18876	GabinKolly author:GabinKolly	feat(ModelTheory/Fraisse): add proof that Fraïssé limits exist	Fraïssé limits exist. --- All the preparatory work done in other files is contained in the pull request #18749, this pull request adds the work done in ModelTheory/Fraisse, the definition of the sequence of structures whose limit will be the Fraïssé limit, lemmas about this sequence, and then the proof that the limit is indeed a Fraïssé limit. - [ ] depends on: #18749 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-logic	666/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76321 5 months ago	553-47655 553 days ago	0-37 37 seconds
19323	madvorak author:madvorak	feat: Function to Sum decomposition	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Function.20to.20Sum.20decomposition	merge-conflict WIP t-data	50/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean	2	3	['github-actions', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	180-76320 5 months ago	500-56553 500 days ago	43-18002 43 days
19378	adamtopaz author:adamtopaz	feat: Explanation widgets	This adds some simple widgets, wrapped in a tactic, term and command elaborator, for displaying markdown explanations in the infoview. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	101/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Widget/Explain.lean	3	9	['adamtopaz', 'eric-wieser', 'github-actions', 'joneugster', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76319 5 months ago	492-47290 492 days ago	49-76666 49 days
19456	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Finsupp/MonomialOrder/DegRevLex): homogeneous reverse lexicographic order	Definition of the homogeneous reverse lexicographic order --- - [x] depends on: #19453 - [x] depends on: #19455 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-order t-data merge-conflict t-algebraic-geometry	362/0	Mathlib.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76318 5 months ago	539-67494 539 days ago	0-27 27 seconds
19797	eric-wieser author:eric-wieser	refactor: use Qq in the nlinarith preprocessor	This also provides the machinery needed to Qq-ify linarith itself. This is still doing far more `synthInstanceQ`/`isDefEq`(`Q`) than should be needed, but at least drops the `mkAppM`s. Currently, this takes a different approach to the one used by `NormNum.Result`: * `NormNum.Result` deliberately avoids adding any `Expr` parameters to types, as this makes defeq problem at compile-time hard * This PR allows the Expr parameters, but adds casting helpers to easily transport along defeq(Q)s. A few `unsafeIntro`s are left, which correspond to either a Qq bug, or a flaw in the idea behind this approach. I don't know if this pattern is an improvement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta large-import	260/28	Mathlib/Data/Ineq.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Util/Qq.lean	5	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76191 5 months ago	unknown	0-0 0 seconds
20051	Timeroot author:Timeroot	feat: `Clone` and some instances	Defines clones (`Clone`). And there is a file, `Instances.lean`, that gives several most important examples of Clones. In particular, it has all of the clones (in an appropriately general form) that occur in [Post's Lattice](https://en.wikipedia.org/wiki/Post%27s_lattice), and [later proving](https://github.com/leanprover-community/mathlib4/pull/24744) the completeness of Post's Lattice is why I'm making this PR. (Edit: Used to also say "Defined operads (`Operad`), symmetric operads (`SymmOperad`), and clones ... There is a proof that all clones have a natural operad structure.". This has been scrapped.) --- - [x] depends on: #20133 [basics and notations] - [x] depends on: #20134 [permutations] - [x] depends on: #20138 [operad] - [x] depends on: #20141 [clone] - [x] depends on: #23459 [defs] - [ ] depends on: #23460 [basic] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra blocked-by-other-PR label:t-algebra$	623/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Data/Fin/Basic.lean	5	33	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'wmacmil']	nobody	180-76190 5 months ago	unknown	0-0 0 seconds
20466	MohanadAhmed author:MohanadAhmed	feat: Sherman Morrison formula for rank 1 update of the matrix inverse	Provides the Sherman Morrison rank 1 update of the matrix inverse https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	37/0	Mathlib/Data/Matrix/Invertible.lean	1	5	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76188 5 months ago	476-49972 476 days ago	23-30652 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-zulip new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	7	['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey']	nobody	180-76187 5 months ago	378-22716 378 days ago	75-77754 75 days
20649	GabinKolly author:GabinKolly	feat(ModelTheory/Graph): prove characterization of the fraisse limit of finite simple graphs	Prove that a countable graph with the extension property must be the Fraisse limit of finite simple graphs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import merge-conflict t-combinatorics t-logic	175/0	Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Substructures.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76185 5 months ago	unknown	0-0 0 seconds
20652	jjaassoonn author:jjaassoonn	feat: categorical description of center of a ring	We show the isomorphism between `Z(R)` and `End(1 Mod-R)` --- - [x] depends on:#20721 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-category-theory label:t-algebra$	212/21	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Center.lean,Mathlib/CategoryTheory/Conj.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean	7	42	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'qawbecrdtey']	nobody	180-76184 5 months ago	468-73614 468 days ago	5-77051 5 days
20924	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity): Oracle-based computation	This PR adds the types and lemmas for oracle-based computation. In this model, computations are run on a monad which also counts the number of oracle queries executed. With it, it becomes possible to reason about the upper bound of the query complexity of algorithms. In the future, we could extend this work to include the necessary bits from information theory and probability to also reason about lower bounds on query complexity, like the work in https://github.com/girving/debate. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	60	['eric-wieser', 'girving', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao', 'tomaz1502']	nobody	180-76183 5 months ago	450-11078 450 days ago	27-32630 27 days
20956	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity/Sort.lean): Formalization of upper bound of queries for merge sort	This PR builds on top of #20924 to prove that merge sort (as defined in Lean's library) never executes more than `3 * n * ceil_log2 n` comparisons, where `n` is the size of the input list and `ceil_log2` is the ceil of the logarithm in base 2, which is defined in this PR. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list - [ ] depends on: #20924 Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability blocked-by-other-PR	676/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76181 5 months ago	481-44742 481 days ago	0-41 41 seconds
21270	GabinKolly author:GabinKolly	feat(ModelTheory/Bundled): first-order embeddings and equivalences from equalities	Add first-order embeddings and equivalences from equalities between bundled structures. --- Add two definitions to get embeddings and equivalences from equalities between bundled structures, and simple properties. This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author large-import t-logic	102/0	Mathlib/ModelTheory/Bundled.lean	1	27	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76179 5 months ago	399-77992 399 days ago	50-58472 50 days
21277	GabinKolly author:GabinKolly	feat(ModelTheory/PartialEquiv): Define the mapping of a self-partialEquiv through an embedding	Define the mapping of a self-partialEquiv through an embedding and the notion of fully extendable partialEquiv. --- This is some preparatory work for #18876 - [ ] depends on: #21276 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-logic	215/5	Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76177 5 months ago	473-26155 473 days ago	0-668 11 minutes
21616	peabrainiac author:peabrainiac	feat(Topology): concatenating countably many paths	Adds `Path.countableConcat`, the concatenation of a sequence of paths leading up to some point `x`. --- - [x] depends on: #21591 - [x] depends on: #21607 This work is a prerequisite to #20248, where it is used to show that the topology of first-countable locally path-connected spaces is coinduced by all the paths in that space. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	229/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	31	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac']	nobody	180-76174 5 months ago	393-75555 393 days ago	56-56728 56 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	20	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	180-76173 5 months ago	406-4015 406 days ago	50-48893 50 days
21829	Whysoserioushah author:Whysoserioushah	feat(LinearAlgebra/TensorProduct/HomTensor): Add TensorProduct of Hom-modules	Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	174/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/HomTensor.lean	2	27	['Whysoserioushah', 'YaelDillies', 'erdOne', 'github-actions', 'kbuzzard', 'mathlib4-merge-conflict-bot']	nobody	180-76171 5 months ago	412-70846 412 days ago	46-53039 46 days
21903	yhtq author:yhtq	feat: add from/toList between `FreeSemigroup` and `List` with relative theorems	Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-CI large-import merge-conflict label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	12	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76047 5 months ago	407-60002 407 days ago	50-9294 50 days
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	35	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	180-76041 5 months ago	427-70054 427 days ago	20-81245 20 days
22194	eric-wieser author:eric-wieser	feat: oracle computations (alternative)	This explores a simpler version of #20924 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability	698/0	Archive/Examples/SumOracle.lean,Mathlib.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	5	['eric-wieser', 'girving', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76038 5 months ago	unknown	0-0 0 seconds
22231	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion` initial defns	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-topology label:t-algebra$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	8	['Thmoas-Guan', 'github-actions', 'grunweg', 'jcommelin', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	180-76037 5 months ago	259-59318 259 days ago	158-37126 158 days
22232	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.apprUpto`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	399/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76035 5 months ago	449-5928 449 days ago	0-414 6 minutes
22233	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.evalAt`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	488/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76034 5 months ago	449-5929 449 days ago	0-412 6 minutes
22302	658060 author:658060	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	3	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	180-76032 5 months ago	447-23634 447 days ago	0-1528 25 minutes
22389	adomani author:adomani	feat: the variableVariable linter	The motivation comes from [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/style.20proposal.3A.20avoid.20.60variable.20.7BX.7D.20.2E.2E.2E.20variable.20.28X.29.60). Summarising, updating a variable binder for a single declaration can be confusing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	167/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/VariableVariable.lean,variableDeclarationVariable_replacements.py	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76028 5 months ago	unknown	0-0 0 seconds
22497	adomani author:adomani	test: decl diff in lean	Testing branch for #22464. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP CI test-ci	161/0	.github/workflows/PR_summary_lean.yml,Mathlib.lean,Mathlib/Test.lean,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	6	8	['github-actions', 'mathlib4-merge-conflict-bot', 'mergify']	nobody	180-76026 5 months ago	unknown	0-0 0 seconds
22662	plp127 author:plp127	feat: Localization.Away.lift (computably)	This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	18	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	kim-em assignee:kim-em	180-76025 5 months ago	180-76026 180 days ago	257-28368 257 days
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	merge-conflict awaiting-author t-analysis new-contributor	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	13	['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'mhk119']	nobody	180-76019 5 months ago	409-4736 409 days ago	23-16830 23 days
22861	eric-wieser author:eric-wieser	feat: add the trace of a bilinear form	Following the steps at [#Is there code for X? > Laplacian @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Laplacian/near/450834505). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Some questions: * Does this generalize to multilinear maps? * Is there an `RCLike` generalization? * Does this generalize to `BilinMap` instead of just `BilinForm`? Perhaps the approach in [#mathlib4 > Stating Schrodinger's equation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Stating.20Schrodinger's.20equation/near/500409890) of using `ContinuousLinearMap.adjoint'` is better.	merge-conflict awaiting-author t-algebra label:t-algebra$	100/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Trace.lean	2	4	['github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot']	nobody	180-76017 5 months ago	409-54165 409 days ago	23-44995 23 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	31	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	b-mehta assignee:b-mehta	180-76015 5 months ago	355-2886 355 days ago	71-41637 71 days
22954	eric-wieser author:eric-wieser	feat(RingTheory/Congruence/Hom): copy from GroupTheory	This was motivated in review of #22355, but I no longer recall why. It also helps with #29357. Either way, this captures a definition that was inlined in a later file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	214/16	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/TwoSidedIdeal/Kernel.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-76014 5 months ago	429-57728 429 days ago	0-135 2 minutes
23285	AntoineChambert-Loir author:AntoineChambert-Loir	refactor: directed systems in terms of functors	This is a WIP aiming to refactor the work on directed systems using the category theory library. But there are universes nightmares. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory large-import merge-conflict label:t-algebra$	111/45	Mathlib/Order/DirectedInverseSystem.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76008 5 months ago	420-21736 420 days ago	0-24 24 seconds
23460	Timeroot author:Timeroot	feat: Definition of `Clone`	Basics about Clones. Part of #20051 --- - [ ] depends on: #26329 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	326/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Data/Fin/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76006 5 months ago	263-38378 263 days ago	65-54502 65 days
23503	apnelson1 author:apnelson1	feat(Topology/Instances/ENat): ENat and tsum	We give API for the interactions between `tsum` and `ENat`. The type is especially nice, because every function is summable, and there are simplifying lemmas like the statement that a sum is infinite iff either some term is infinite, or the support is infinite. This provides one of the missing pieces for working painlessly with discrete objects, 'propositional' finiteness and cardinality. For instance, one can sum a function `f : a -> ENat` over an arbitrary set with the term `∑' a : s, 1`, and it will be provable that `∑' a : s, 1 = s.encard` and `(support f).encard ≤ ∑' a, f a` without ever having to split into finite/infinite cases. As is pointed out in the module docstring for `Data.ENat`, there are strong analogies between `ENat` and `ENNReal`, and the API runs parallel to the API for `tsum`/`ENNReal`. One could call it 'duplication', but I have yet to find a common generalization of the two that saves work, or a third example of a natural type with these same properties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology large-import	205/2	Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Topology/Instances/ENat.lean	3	3	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76004 5 months ago	399-30557 399 days ago	14-6036 14 days
23585	plp127 author:plp127	feat: `Filter.atMax` and `Filter.atMin`	Adds `atMax` and `atMin`, filters. Making an analogy, `atMax` : `atTop` :: `IsMax` : `IsTop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	148/0	Mathlib.lean,Mathlib/Order/Filter/AtMaxMin.lean	2	5	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'urkud']	nobody	180-76003 5 months ago	unknown	0-0 0 seconds
23758	erdOne author:erdOne	feat(Topology/Algebra): linearly topologized iff non-archimedean	...for topological modules over compact rings or `ℤ`-finite rings --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import merge-conflict awaiting-author t-topology label:t-algebra$	138/3	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Topology/Algebra/LinearTopology.lean	2	22	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	180-76001 5 months ago	282-466 282 days ago	124-78308 124 days
24161	urkud author:urkud	feat(Analysis/Calculus/Schwarzian): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	190/3	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/Schwarzian/Basic.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-75867 5 months ago	unknown	0-0 0 seconds
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics new-contributor	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	42	['IvanRenison', 'github-actions', 'mathlib4-merge-conflict-bot', 'vlad902']	kmill assignee:kmill	180-75866 5 months ago	266-74447 266 days ago	123-18878 123 days
24540	robertmaxton42 author:robertmaxton42	feat(Quiv): add the empty, vertex, point, interval, and walking quivers	Add: * The empty quiver * The vertex quiver (one vertex, and no edges) and the point quiver (one vertex, one self-edge) * The interval quiver (two vertices with an edge between them) * The walking quiver (vertices `0` and `1` with two edges both `0 -> 1`. Functors from the walking quiver to `Type` define quivers, by interpreting `F.obj 0` as the type of vertices, `F.obj 1` as the type of edges, using one of the two edges to label the source of every edge and using the other to label the target.) - [x] depends on: #24538 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	370/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/Logic/Small/Defs.lean	4	14	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robertmaxton42', 'robin-carlier']	nobody	180-75861 5 months ago	375-21042 375 days ago	0-6849 1 hour
24744	Timeroot author:Timeroot	Post's lattice	Draft PR for now so I can get CI checks. Eventually want to prove Post's Lattice --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	758/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Algebra/Clone/PostLattice.lean,Mathlib/Data/Fin/Basic.lean	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75856 5 months ago	unknown	0-0 0 seconds
24850	pechersky author:pechersky	feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra	Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111	merge-conflict t-topology	509/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	9	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	urkud assignee:urkud	180-75853 5 months ago	180-75854 180 days ago	177-43034 177 days
25324	eric-wieser author:eric-wieser	feat: more functorial results about DFinsupp	We have these already for Finsupp. The `DFinsupp` statements need some extra casts in some places. --- - [ ] depends on: #27182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [#mathlib4 > Equiv.cast for structures @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Equiv.2Ecast.20for.20structures/near/521390935)	merge-conflict awaiting-author t-algebra t-data label:t-algebra$	137/16	Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean	2	13	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	pechersky assignee:pechersky	180-75848 5 months ago	231-9719 231 days ago	19-26510 19 days
25585	Paul-Lez author:Paul-Lez	feat(Tactic/Linters/DeprecatedSimpLemma): lint for deprecated simp lemmas	The deprecated simp lemma linter flags declarations that have both the `deprecated` and `simp` attributes. See Zulip discussion: [#mathlib4 > Help with Mathlib.Order.Interval.Finset.Defs @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Help.20with.20Mathlib.2EOrder.2EInterval.2EFinset.2EDefs/near/505994843) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	105/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedSimpLemma.lean,MathlibTest/DeprecatedSimpLemmaTest.lean	4	8	['adomani', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-75721 5 months ago	344-61416 344 days ago	0-87 1 minute
25683	eric-wieser author:eric-wieser	feat: Enumeration of NonemptyInterval	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data large-import	52/4	Mathlib/Data/Sym/Sym2/Fin.lean,Mathlib/Data/Sym/Sym2/Order.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75718 5 months ago	unknown	0-0 0 seconds
25739	literandltx author:literandltx	feat(NumberTheory/LegendreSymbol): Add sqrt‐of‐residue theorems for p=4k+3 and p=8k+5	Add a new file `QuadraticResidueRoots.lean` under `Mathlib/NumberTheory/LegendreSymbol/` that proves two explicit “square-root of quadratic residue” theorems for primes of the specific form. - `exists_sqrt_of_residue_mod4_eq3` for primes `p = 4k + 3` - `exists_sqrt_of_residue_mod8_eq5`* for primes `p = 8*k + 5` It also introduces the helper lemmas `euler_criterion_traditional` and `legendreSym.at_two_mod8_eq_5`. Import lines in `Mathlib.lean` and `Mathlib/NumberTheory/LegendreSymbol/Basic.lean` have been updated accordingly.	merge-conflict awaiting-author t-number-theory new-contributor	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	3	['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	literandltx assignee:literandltx	180-75717 5 months ago	323-12880 323 days ago	17-63153 17 days
25746	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): `Cancelable` boilerplate for the `rotate_isos` WIP tactic	This PR adds some boilerplate that will be used in a forthcoming PR implementing a `rotate_isos` tactic that aims to provide easy ways of moving one or more morphisms that can be inferred to be isomorphisms (not necessarily through the `IsIso typeclass, but also directly by recognizing them as e.g components of natural isomorphisms, or functor application to such morphisms). The boilerplate in this PR abstracts the notion of a cancelable expression for a morphism in a composition of (iso)morphisms in a category, and records a global reference to a list of "cancelable factories", _i.e_ functions that try to recognize term in an expression as a "cancelable" morphism, and provides helper to register such functions. --- First part of a series of 3 PRs contributing the `rotate_isos` tactic to mathlib. Second part will actually implement the tactic, and provide a test suite. Please read the description of the second PR (#24454) to get more details. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24452. Original PR: https://github.com/leanprover-community/mathlib4/pull/24452	merge-conflict awaiting-author t-category-theory t-meta	162/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,scripts/noshake.json	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75715 5 months ago	340-74968 340 days ago	0-2 2 seconds
25747	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): the `rotate_isos` tactic	We define a `rotate_isos` tactic for category theory in mathlib. At its core, the tactic transform terms of type `α(1) ≫ ⋯ ≫ α(k) = β(1) ≫ ⋯ ≫ β(l)` where `α` and `β` are families of morphisms in whith the first `i` morphisms of the left-hand side and the last `j` morphisms of the right-hand side are isomorhisms, into terms of type `α(k-i) ≫ ⋯ ≫ α(k) ≫ inv β(l) ≫ ⋯ ≫ β(l-j+1) = inv α(j) ≫ ⋯ ≫ inv α(1) ≫⋯ ≫ β(l-j)`. The construction of the inverses of expression are caried at the `Expr` levels are built out of the expressions of the morphisms, for instance, for this tactic, the inverse of `F.map (G.map (H.map f.hom)))` will directly be `F.map (G.map (H.map f.inv)))` (which would have to be re-simplified), rather than an `inv` term form an `IsIso` instance. The tactic can be applied at a local hypothesis or at the main goal, or can be used through a `rotate_isos%` term elaborator if e.g one wants to add such a "rotated" form to a `simp` or `rw` call. We also support removing morphisms "from the right" of the lhs, rather than from the right. --- The motivations behind this tactic are the following : - This tactic can "autogenerate" lemmas and terms generalizing lemmas such as [CategoryTheory.Iso.hom_inv_id_app_app_app](https://leanprover-community.github.io/mathlib4_docs/Mathlib/CategoryTheory/NatIso.html#CategoryTheory.Iso.hom_inv_id_app_app_app). This can also generate lemmas `F.map (G.map f.hom) ≫F.map (G.map f.inv) = 𝟙 _`, and can be used to unlock a `simp` call that blocks at an expression of the form `F.map (G.map f.hom) ≫F.map (G.map f.inv) `. - Currently, cancelling morphisms "from the right" in an expression in category theory is a bit of a pain. You have to first reassociate the expression, perform multiple calls to `Iso.inv_comp_eq`, reassociate, etc. This at least automates this process in a fairly straightforward way. - There are expressions in category theory that have no "right forms", e.g the pentagon axiom for monoidal categories, which has many variations in the way one can read the diagram of isomorphisms that represents it. Elaborators such as `rotate_iso%` easily generates all possible forms of such identities from one single form, and avoids having to state multiple forms of the same equality as individual lemmas. - I have been playing with medium-sized diagrams of isomorphisms recently (think for example vertical/horizontal compositions of `CatCommSq`, whiskering a corner of such diagrams, etc.), and it made me wish a lot of time that such easy way to transforms equalities to equivalent forms were available. - [ ] depends on: #25746 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24454. Original PR: https://github.com/leanprover-community/mathlib4/pull/24454	WIP blocked-by-other-PR t-category-theory merge-conflict awaiting-author t-meta	871/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75714 5 months ago	340-74607 340 days ago	0-2 2 seconds
25748	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): Initial lemmas for the `rotate_iso` tactic	This PR records an initial set of lemmas to be used by the WIP `rotate_isos` tactic. --- - [ ] depends on: #25746 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24506. Original PR: https://github.com/leanprover-community/mathlib4/pull/24506	merge-conflict blocked-by-other-PR t-meta	496/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,scripts/noshake.json	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75712 5 months ago	340-73699 340 days ago	0-599 9 minutes
25750	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): bicategory extension for `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in bicategorical contexts. For instance, if `α : g ⟶ h` is an invertible 2-cells, the term `f ◁ α ` is also recognized as invertible, with inverse `f ◁ α' `, where `α'` is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic `inv (f ◁ α)` as inverse for this term. --- - [ ] depends on: #25747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24633. Original PR: https://github.com/leanprover-community/mathlib4/pull/24633	merge-conflict blocked-by-other-PR t-category-theory t-meta	1206/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Bicategory.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75710 5 months ago	340-73804 340 days ago	0-1 1 second
25751	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): monoidal extension of `rotate_isos`	This PR registers some lemmas to the `rotate_isos` tactic so that it applies in monoidal contexts. For instance, if α : y ⟶ z is an invertible morphism, the term x ◁ α is also recognized as invertible, with inverse x ◁ α' , where α' is the expression for the inverse constructed by the tactic. Without this extension, the tactic would only construct the generic inv (x ◁ α) as inverse for this term. We also take care of terms of the form `f ⊗ g` --- - [ ] depends on: #25747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24634. Original PR: https://github.com/leanprover-community/mathlib4/pull/24634	merge-conflict blocked-by-other-PR t-category-theory t-meta	1362/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Monoidal.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75709 5 months ago	340-73450 340 days ago	0-2 2 seconds
25752	robin-carlier author:robin-carlier	feat(Tactic/CategoryTheory): whiskering lemmas for `rotate_isos`	This PR extends the base set of terms recognized by the `rotate_isos` tactic to include terms of the form `whiskerLeft F f`, `isoWhiskerLeft F e`, and `NatTrans.hcomp`/ `NatIso.hcomp`. --- - [ ] depends on: #25747 Technically, it could depend solely on #24506, but there’s not much point getting this merged if the base tactic is not there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24650. Original PR: https://github.com/leanprover-community/mathlib4/pull/24650	merge-conflict blocked-by-other-PR t-meta	1365/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Core.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,MathlibTest/CategoryTheory/RotateIsos.lean,scripts/noshake.json	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75707 5 months ago	340-73261 340 days ago	0-50 50 seconds
25838	Bergschaf author:Bergschaf	feat(Order/Atoms): Finsets are Atomistic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order large-import	31/0	Mathlib/Order/Atoms.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75696 5 months ago	339-63158 339 days ago	0-5594 1 hour
25987	Multramate author:Multramate	refactor(AlgebraicGeometry/EllipticCurve/Affine/*): some minor changes	This PR continues the work from #24571. Original PR: https://github.com/leanprover-community/mathlib4/pull/24571	merge-conflict t-algebraic-geometry	0/12	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	4	['Multramate', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-75684 5 months ago	336-22966 336 days ago	0-588 9 minutes
25990	Multramate author:Multramate	chore(NumberTheory/EllipticDivisibilitySequence): rename definitions	This PR continues the work from #25132. Original PR: https://github.com/leanprover-community/mathlib4/pull/25132	merge-conflict t-number-theory	265/45	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	3	['Multramate', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75681 5 months ago	336-22954 336 days ago	0-449 7 minutes
26165	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add lemma which shows that variation of a `ℝ≥0∞` VectorMeasure is equal to itself	Add a lemma for the variation of a VectorMeasure which tells that if `μ` is `VectorMeasure X ℝ≥0∞` then ``μ.ennrealVariation = μ`. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author merge-conflict blocked-by-other-PR new-contributor	467/0	Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/Order/Partition/Finpartition.lean	3	9	['github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot', 'oliver-butterley', 'yoh-tanimoto']	nobody	180-75528 5 months ago	317-70483 317 days ago	15-66224 15 days
26298	adomani author:adomani	test: the commandStart linter only acts on modified files.	Test for #26299: should flag issues in the new file and also in the modified file `Mathlib/Data/Array/Extract.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-linter	63/1	Mathlib.lean,Mathlib/Data/Array/Extract.lean,Mathlib/New.lean,Mathlib/Tactic/Linter/CommandStart.lean	4	21	['adomani', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75506 5 months ago	329-61736 329 days ago	0-168 2 minutes
26300	igorkhavkine author:igorkhavkine	feat(Analysis/Calculus/FDeriv): continuous differentiability from continuous partial derivatives on an open domain in a product space	If a function `f : E × F → G` is continuously differentiable, then its partial derivatives along `E` and `F` are also continuous. The non-trivial converse implication holds when the partial derivatives are continuous on an open domain, and they can be added together to give the total derivative of `f`. See this [#mathlib4 > Partial derivatives @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/near/520995477) and the containing thread for some discussion. The PR creates a new import (`Mathlib.Analysis.Calculus.FDeriv.Partial`), where other results about partial derivatives could go in the future. --- this is the migration of #25304 to the PR-from-fork workflow - [x] depends on: #25564 - [x] depends on: #26273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor awaiting-author t-analysis merge-conflict	468/0	Mathlib/Analysis/Calculus/FDeriv/Partial.lean	3	23	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	180-75505 5 months ago	277-37495 277 days ago	44-77029 44 days
26329	Timeroot author:Timeroot	feat: Definition of `Clone` notations and typeclasses	Definitions and notation typeclasses for #20051 --- This PR continues the work from #23459. Original PR: https://github.com/leanprover-community/mathlib4/pull/23459 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra awaiting-CI label:t-algebra$	100/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	4	['Timeroot', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75501 5 months ago	328-72410 328 days ago	0-21917 6 hours
26398	ChrisHughes24 author:ChrisHughes24	feat(ModelTheory): definable functions	--- Possibly this should be generalized to partial functions. I migrated the PR by hand instead of using the script. - [x] depends on: #20166 - [x] depends on: #20161 - [x] depends on: #20115 - [x] depends on: #20174 - [x] depends on: #20175 - [x] depends on: #21948 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-logic	618/0	Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean	2	13	['ChrisHughes24', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	180-75488 5 months ago	202-64953 202 days ago	87-76183 87 days
26399	ChrisHughes24 author:ChrisHughes24	refactor(ModelTheory): tidy up proof of Ax-Grothendieck with definable functions	I migrated this PR by hand instead of using the script. --- - [x] depends on: #20166 - [x] depends on: #20161 - [x] depends on: #20115 - [x] depends on: #20174 - [x] depends on: #20175 - [x] depends on: #20180 - [x] depends on: #21948 - [ ] depends on: #26398 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-logic	639/60	Mathlib.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/ModelTheory/FunctionalFormula.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75487 5 months ago	327-69690 327 days ago	0-958 15 minutes
26432	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data.Nat.LogFueled): fueled version of `clog`	This PR continues the work from #25557. Original PR: https://github.com/leanprover-community/mathlib4/pull/25557	merge-conflict t-data	201/0	Mathlib.lean,Mathlib/Data/Nat/LogFueled.lean	2	3	['AntoineChambert-Loir', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75486 5 months ago	180-75487 180 days ago	145-77007 145 days
26594	metakunt author:metakunt	feat(Algebra/Polynomial/ZMod): Add Polynomial.equiv_of_nat_of_polynomial_zmod	This adds an explicit bijection between the naturals and $$\mathbb{Z}/n\mathbb{Z}[X]$$ in a canonical way. --- I feel that some API is missing to make the theorem shorter, I have no idea what lemmas to extract though. Also I don't know when to use spaces and when not, so I did it best effort.	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	3	['Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75357 5 months ago	296-32715 296 days ago	25-5233 25 days
26644	kckennylau author:kckennylau	feat(SetTheory/ZFC): Define the language of sets and state the ZFC axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-set-theory	381/0	Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,docs/references.bib	3	50	['b-mehta', 'digama0', 'github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	180-75355 5 months ago	267-40218 267 days ago	40-52145 40 days
26648	eric-wieser author:eric-wieser	chore(TensorProduct): remove more `suppress_compilation`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-core-PR t-algebra label:t-algebra$	3/7	Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean	3	5	['eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75354 5 months ago	316-77389 316 days ago	3-19989 3 days
26757	fweth author:fweth	feat(CategoryTheory/Topos): define elementary topos	This commit begins the formalization of the notion of an elementary topos, following the definition in \[Mac Lane & Moerdijk, Sheaves in Geometry and Logic (1992), Ch. IV, Section 1]. It introduces the file `Mathlib/CategoryTheory/Topos/Basic.lean`, which currently includes: * The definition of an elementary topos. * Proof that the power object map is a functor * Theorem about pullbacks of characterstic maps Subobject classifiers, which are used in the definition, have already been defined in `CategoryTheory/Topos/Classifier.lean` Work in progress: further formalization of the section is planned. Questions: * Should the definition of power objects be separated into its own file/module, perhaps under `CategoryTheory/Topos/PowerObject.lean`? * Is the notation `P` / `P_morph` / `P_functor` for the power object functor on objects / morphisms / total acceptable? * Should the comments and docstrings rather use the notation from the book, where `g ∘ f` denotes arrow composition from righ to left, or the Lean variant `f ≫ g`? Klaus Gy klausgy@gmail.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	401/66	Mathlib.lean,Mathlib/CategoryTheory/Closed/PowerObjects.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean	9	17	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	180-75352 5 months ago	210-41971 210 days ago	62-6838 62 days
26914	quangvdao author:quangvdao	feat(Data/PFunctor/Univariate): more definitions for univariate `PFunctor`	This PR defines several basic definitions of `PFunctor`, including zero, one, constants, monomials, coproduct (sum), product, sigma, pi, tensor product, universe lifting, and equivalence. We also add: (1) simple lemmas connecting the basic definitions, (2) an automatically derived ext lemma for `PFunctor` via `@[ext]` attribute Some things I'm not clear on: - I define `HAdd` and `HMul` instances for coproduct and product of poly functors having different universe levels. Should I also define `Add` and `Mul` instances for poly functors having the same universe level? - Is it ok to define notation for tensor product, i.e. `@[inherit_doc] scoped infixr:80 " ⊗ " => tensor`? I'm worried it might clash with other notation. - Need a double-check on the priority of notation. Some future definitions to add: - Various equivalences arising from arithmetic identities, e.g., `P + 0 ≃ₚ P`. - Definitions of Lenses and Charts (each of them will be a file or even a folder) - Exponential objects (corresponding to both `prod` and `tensor`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	20	['alexkeizer', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao']	eric-wieser assignee:eric-wieser	180-75331 5 months ago	180-75332 180 days ago	133-23955 133 days
26920	yuma-mizuno author:yuma-mizuno	feat(Tactic.CategoryTheory): add associator inserting tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory t-meta	714/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Associators.lean,MathlibTest/CategoryTheory/Associators.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75330 5 months ago	313-77704 313 days ago	0-16 16 seconds
26990	joelriou author:joelriou	feat(CategoryTheory/Abelian): Noetherian objects form a Serre class	This PR continues the work from #22367. Original PR: https://github.com/leanprover-community/mathlib4/pull/22367	merge-conflict WIP t-category-theory	311/14	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/NoetherianObject.lean,Mathlib/CategoryTheory/Abelian/Subobject.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-75320 5 months ago	311-63882 311 days ago	0-45 45 seconds
27098	Paul-Lez author:Paul-Lez	feat(Algebra/Category/ModuleCat/Sheaf/VectorBundle): define vector bundles	This PR defines vector bundles (upstreamed from [formal-conjectures](https://github.com/google-deepmind/formal-conjectures/pull/28/files)). I plan on adding some more API about the definition in this PR, but figured it would be nice to get some initial feedback about the definition before doing so! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	53/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/VectorBundle.lean	2	5	['Kiolt', 'Raph-DG', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	180-75317 5 months ago	292-31587 292 days ago	16-82477 16 days
27155	Pjotr5 author:Pjotr5	feat: Shearer's bound on the independence number of triangle free graphs	I added the file IndependenceNumber.lean to the Mathlib.Combinatorics.SimpleGraph.Triangle folder. It contains a proof of a theorem by Shearer on the independence number of triangle-free graphs . I was told this might be useful to add to Mathlib a Zullip thread linked [here](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Convexity.20of.20a.20specific.20function/with/510469526). I tried to comply as much as I could with the Mathlib style guide, but I realise that there is probably still a significant amount of editing to be done. For one thing: there are probably some lemmas and theorems in there that might be better suited in other files, but since this is my first PR I though I would all put it in one file before starting to edit a bunch of files. I was also advised to split up the file into multiple smaller PRs, but since everything is basically serving this one proof I could not really find a natural way to do that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics new-contributor	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	10	['Pjotr5', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-75315 5 months ago	268-45624 268 days ago	39-17587 39 days
27163	pechersky author:pechersky	feat(Topology/ValuativeRel): of and to basis of compatible valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #30262	t-number-theory t-algebra merge-conflict awaiting-author t-topology label:t-algebra$	229/62	Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	73	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	180-75314 5 months ago	182-20705 182 days ago	84-31691 84 days
27215	kckennylau author:kckennylau	feat(AlgebraicGeometry): Define the Zariski site on `CommRingCatᵒᵖ`	We define the Zariski site on `CommRingCatᵒᵖ` by inducing the topology from `Scheme`, and then we show that this topology is equal to the one generated by the pretopology of finite, surjective, and standard open morphisms. --- - [x] depends on: #28614 - [x] depends on: #28615 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	312/0	Mathlib.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Sites/BigAffineZariski.lean	3	33	['chrisflav', 'github-actions', 'joelriou', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	180-75312 5 months ago	237-67876 237 days ago	3-70573 3 days
27309	kckennylau author:kckennylau	feat(CategoryTheory): a presheaf on `CostructuredArrow F d` can be extended to a presheaf on `C`	--- Depends on: * [ ] #27321 Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	218/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Presheaf/LeftExtension.lean	2	4	['erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'robin-carlier']	erdOne assignee:erdOne	180-75181 5 months ago	286-65380 286 days ago	15-69033 15 days
27321	kckennylau author:kckennylau	feat(CategoryTheory): Colimit can be computed fiberwise	We consider category `J` equipped with a functor `F : J ⥤ D` to a discrete category `D`. Then the colimit of any diagram `diagram : J ⥤ C` can be computed using the following algorithm: 1. For each `d : D`, compute the colimit of the restricted diagram `F.fiberIncl d ⋙ diagram`. 2. Take the coproduct of these colimits over all `d : D`. We call this "computing the colimit fiberwise". --- Zulip: [#Is there code for X? > over category via a functor](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/over.20category.20via.20a.20functor/with/529574191) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory awaiting-CI	136/0	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Fiber.lean,Mathlib/CategoryTheory/Limits/Shapes/Fiberwise.lean	3	25	['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	180-75179 5 months ago	264-77603 264 days ago	19-5489 19 days
27417	PierreQuinton author:PierreQuinton	feat: add `SigmaCompleteLattice`	A $\sigma$-complete lattice is a lattice in which every countable subset `s` has a least upper bound and a greatest lower bound, denoted below by `sSup s` and `sInf s`. This PR adds the classes `SigmaCompleteLattice` as well as some theorems (mainly adapted from `CompleteLattice` and `ConditionallyCompleteLattice`). This is an adaptation of #26318 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-order	394/0	Mathlib.lean,Mathlib/Order/SigmaCompleteLattice.lean	2	9	['PierreQuinton', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	180-75176 5 months ago	286-43636 286 days ago	12-24971 12 days
27753	YunkaiZhang233 author:YunkaiZhang233	feat(CategoryTheory): implemented proofs for factorisation categories being equivalent to iterated comma categories in two ways	--- Completed one of the tasks in TODOs, shown and implemented the details for (X/C)/f ≌ Factorisation f ≌ f/(C/Y). This is migrated from my previous PR #22390 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	13	['YunkaiZhang233', 'b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	180-75160 5 months ago	291-46323 291 days ago	0-3448 57 minutes
27824	ChrisHughes24 author:ChrisHughes24	feat(Calculus): exists_gt_of_deriv_pos and variants	--- I created a new file for this as I anticipate there will be many lemmas relating derivatives and monotonicity in future. Some lemmas relating deriviatives to monotonicity are already in mathlib and should maybe moved to the file (e.g. docs#HasDerivWithinAt.nonneg_of_monotoneOn). I stated them in as much generality as I could, copying the generality of `HasDerivWithinAt.nonneg_of_monotoneOn`. - [x] depends on: #28039 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	103/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Order.lean	2	37	['ChrisHughes24', 'EtienneC30', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	hrmacbeth assignee:hrmacbeth	180-75159 5 months ago	195-36088 195 days ago	81-53032 81 days
27850	fyqing author:fyqing	feat: 0-dimensional manifolds are discrete and countable	This is the converse direction of the classification of 0-dimensional manifolds. The other direction was shown in #22105. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-differential-geometry new-contributor	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	14	['fyqing', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'tb65536']	grunweg assignee:grunweg	180-75158 5 months ago	290-20985 290 days ago	0-5718 1 hour
27973	smmercuri author:smmercuri	feat: the ring of integers of a `ℤₘ₀`-valued field is compact whenever it is a DVR and the residue field is finite	This PR continues the work from #21844. Original PR: https://github.com/leanprover-community/mathlib4/pull/21844	merge-conflict awaiting-author t-algebra large-import label:t-algebra$	54/2	Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	2	9	['github-actions', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	nobody	180-75032 5 months ago	234-86390 234 days ago	37-63652 37 days
28124	kckennylau author:kckennylau	feat(Tactic): Call an arbitrary Simproc	In the current framework, `Simproc`s are declared by name, and can only be referred to by name. For example, [Nat.divisors_ofNat](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Tactic/Simproc/Divisors.html#Nat.divisors_ofNat) is declared as: ```lean dsimproc_decl Nat.divisors_ofNat (Nat.divisors _) := fun e => do ``` This declaration syntax does not allow for a `Simproc` to depend on any arguments, and even if one constructed a `Simproc` that depends on e.g. a natural number, such as `foo : ℕ → Simproc`, one still cannot call it using the syntax `by simp [foo 37]`. Therefore, this new function aims to solve this problem, by allowing an arbitrary `Simproc` to be executed, using the newly defined function `Lean.Meta.Simp.Simproc.apply (s : Simproc) : TacticM Unit`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	79/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Apply.lean,MathlibTest/Simproc/Apply.lean	4	28	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'hrmacbeth', 'kckennylau', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	180-75027 5 months ago	250-66496 250 days ago	23-23815 23 days
28125	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics): basic definition of simplicial complexes	This PR introduces the basic definition of a finite (abstract) simplicial complex, located in Mathlib/Combinatorics/SimplicialComplex/Basic.lean. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this is a small stepping stone in that direction. Some other commits will shortly depend on this one. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. We would also like to thank our group members Tom Lindquist and Quang Minh Nguyen for our fruitful discussions.	merge-conflict t-combinatorics new-contributor	374/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-75026 5 months ago	180-75027 180 days ago	99-64548 99 days
28316	eric-wieser author:eric-wieser	feat(Tactic/NormNum): better trace nodes	Comparing the infoview on the first example in the test file \| Before \| After \| \|---\|---\| \| \| \| In the after version, the extension names are all clickable. Similar to #21450. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	136/5	Mathlib.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Util/Trace.lean,MathlibTest/norm_num_trace.lean	4	20	['JovanGerb', 'eric-wieser', 'github-actions', 'kmill', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'plp127']	JovanGerb assignee:JovanGerb	180-75020 5 months ago	263-31907 263 days ago	15-76174 15 days
28325	pechersky author:pechersky	feat(WithZeroTopology): `locallyCompactSpace_iff_locallyFiniteOrder_units`	On the way to golf/generalize the proof that locally compact valued fields have locally finite valuation groups as embodied in `Valued.integer.locallyFiniteOrder_units_mrange_of_isCompact_integer` ] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-order large-import	81/2	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	3	13	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'ocfnash']	PatrickMassot assignee:PatrickMassot	180-75019 5 months ago	185-43297 185 days ago	93-41632 93 days
28349	kckennylau author:kckennylau	feat(Meta): add notation for naming stacked polynomials	This PR changes the notation for naming formal variables associated to recursive polynomial-like objects. Registration is done only once per each polynomial-like functor. Usage: ```lean register_poly_vars "[" "]" Polynomial Polynomial.C Polynomial.X register_poly_vars (mv := true) "[" "]" MvPolynomial MvPolynomial.C MvPolynomial.X name_poly_vars R[a,b][C] name_poly_vars _[x,y,z] ``` `_[[x,y,z]]` allows for the hole to be substituted by any base ring, so `(x : R[[x,y,z]])` will be valid syntax. There has been some discussion about its implementation: * It has been suggested that `R[x,y][z]` should mean that `R[x,y]` is a subring, i.e. `x` should live in `R[x,y]`, but in my implementation `x` lives in the big ring `R[x,y][z]`. There are two ways to get the other behaviour: * One can do `R[x,y]` and then `(R[x,y])[z]`. * One can do `R[a,b]` and `R[x,y][z]`. I personally prefer this one because we should make it clearer that they are different rings. * There has been some discussion over what `R` means. In my implementation, if you ever refer to a `variable` called `R`, then `R` is fixed to that variable, meaning that if you later define a variable with the same name, `R` will still refer to the old variable. Also, this does not respect namespace, meaning that if you refer to `Foo.bar[x,y]`, and later open `Foo`, you will not be able to access the declared ring with `bar[x,y]`. --- I have not mass deployed the new syntax at every possible location, I plan to do that in a future PR following this. Zulip: [#mathlib4 > Notation for polynomial variables](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Notation.20for.20polynomial.20variables) This is a refactor of the currently existing [Mathlib.Tactic.namePolyVarsOver](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Tactic/Ring/NamePolyVars.html#Mathlib.Tactic.namePolyVarsOver). More explicitly, the current invocation `name_poly_vars x,y over R` is now `poly_variable R[x,y]`. The behaviours inherited from `name_poly_vars` are: * We do not synthesize the necessary instances (such as `[CommRing R]`) at the point of declaration, but only when the new notations are used. * We refer to an explicit term (`R` in the examples) which is "fixed", in the sense that: * it is only valid for `R` explicitly, and not any other `variable` such as `S`. * it has built-in hygiene, so if you shadow the variable by declaring a new `variable (R : Type)`, it will still refer to the old one. And the new behaviours are: Currently only `x` and `y` are new notations, but in the new tactic the whole ring `R[x,y]` is also available as notation. * Currently only the forward direction (i.e. elaboration, going from `x` to `MvPolynomial.X 0`) is implemented, but in the new tactic we also implement the backward direction, printing `MvPolynomial.X 0` back as `x` (and `MvPolynomial (Fin 2) R` is printed as `R[x,y]`). * Support beyond just `MvPolynomial`. * Support for nested polynomial-like rings, such as `R[x,y][t][[z]]` for `PowerSeries (Polynomial (MvPolynomial (Fin 2) R))`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	778/87	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/PolyVariable.lean,Mathlib/Tactic/Ring/NamePolyVars.lean,MathlibTest/PolyVariable.lean,scripts/noshake.json	10	110	['JovanGerb', 'adamtopaz', 'chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'kim-em', 'mathlib4-merge-conflict-bot', 'plp127', 'robertmaxton42', 'sgouezel']	adamtopaz assignee:adamtopaz	180-75016 5 months ago	187-66356 187 days ago	58-1196 58 days
28530	nonisomorphiclinearmap author:nonisomorphiclinearmap	feat(Combinatorics/SimplicialComplex/Topology): add standard simplices and geometric realisation (colimit + functoriality)	Introduce the standard simplex on a finite vertex set and build the geometric realisation \|X\| of a simplicial complex. Prove that \|X\| is the colimit of the face diagram δ_X : X.faces ⥤ TopCat, and define the induced map on realisations \|φ\| : \|X\| ⟶ \|Y\| for a simplicial map φ. Show that the abstract map from colimit functoriality agrees with the concrete push-forward of barycentric coordinates. Package these into a functor SimplicialComplexCat ⥤ TopCat. --- This is our first contribution to mathlib. This work was done as part of the Fields Institute Summer Undergraduate Program on formalization in topological combinatorics. Eventually, we aim to formalize Lovasz's proof of the Kneser Conjecture and this lays the groundwork to do this. We would like to acknowledge the Fields Institute for Research in Mathematical Sciences for their sponsorship. We would also like to thank our supervisors, Professor Chris Kapulkin and Mr. Daniel Carranza, for their guidance and support throughout this project. I would also like to thank our group members Sebastian Kumar, Tom Lindquist and Quang Minh Nguyen for our fruitful discussions. - [ ] depends on: #28125	merge-conflict blocked-by-other-PR t-combinatorics new-contributor	1826/0	Mathlib.lean,Mathlib/Combinatorics/SimplicialComplex/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Category.lean,Mathlib/Combinatorics/SimplicialComplex/FacePoset.lean,Mathlib/Combinatorics/SimplicialComplex/Hom.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Basic.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Colimit.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Diagram.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Functor.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/GeomReal/Map.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/Simplex.lean,Mathlib/Combinatorics/SimplicialComplex/Topology/SimplexMap.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75012 5 months ago	275-28840 275 days ago	0-591 9 minutes
28868	yury-harmonic author:yury-harmonic	feat(Positive): add `OfNat` instance	Also fix defeq for `Div` in the `Group` instance. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	41/13	Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Data/PNat/Defs.lean	3	3	['github-actions', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	180-74874 5 months ago	267-32863 267 days ago	0-2821 47 minutes
28871	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Tournaments	Define orientations and tournaments. Related to #26771. Co-authored-by: Rida Hamadani --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	6	['JaafarTanoukhi', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot']	kmill assignee:kmill	180-74873 5 months ago	180-74874 180 days ago	55-54919 55 days
29108	JonBannon author:JonBannon	feat(MeasureTheory): add `LInfty.lean` with `Mul` and `const` related results.	Continuing to develop pieces needed for a `CStarAlgebra` instance for `Lp R ∞ μ`, we introduce a file `MeasureTheory.Function.LInfty.lean` that takes `MeasureTheory.Function.LpSpace.Basic` and `MeasureTheory.Function.Holder` as imports, and introduces the `Mul` instance on Linfty, and const-related results. In a future PR we will handle `One`, as this will require dealing with `AEEqFun` as well as `Lp` level objects and it's probably best to handle these together in a single PR. We opted to add this file to keep imports light, since adding the `Mul` results to `Basic` would require importing `Holder`, and including these results in `Holder` seemed too specific and would make `Holder` heavier. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	91/0	Mathlib.lean,Mathlib/MeasureTheory/Function/LInfty.lean	2	6	['JonBannon', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	180-74866 5 months ago	258-40363 258 days ago	4-7234 4 days
29481	llllvvuu author:llllvvuu	feat(LinearAlgebra/Eigenspace): roots of matrix minpoly give spectrum	This is derived from the corresponding result on linear maps. --- - [x] depends on: #29478 for some simp lemmas [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	13/0	Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean	1	5	['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-74841 5 months ago	251-16757 251 days ago	0-13173 3 hours
29526	llllvvuu author:llllvvuu	feat: `Multiset.map f` identifies `f` up to permutation	Motivation: Reason about `Fintype`-indexed families via `Multiset` equality. Example use case 1: ```lean theorem Matrix.IsHermitian.cfc_eigenvalues {d : Type} [Fintype d] [DecidableEq d] {M : Matrix d d 𝕜} (hM : M.IsHermitian) (f : ℝ → ℝ) (hcfc : Matrix.IsHermitian (cfc f M) := cfc_predicate f M) : ∃ (e : d ≃ d), hcfc.eigenvalues = f ∘ hM.eigenvalues ∘ e := by have := hcfc.roots_charpoly_eq_eigenvalues.symm rw [hM.charpoly_cfc_eq f, Polynomial.roots_prod] at this; swap · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this have he := (Multiset.compTriple_equivOfMapUnivEq this).comp_eq simp_rw [← Function.comp_def RCLike.ofReal, ← Function.comp_def f, Function.comp_assoc] at he exact ⟨_, RCLike.ofReal_injective.comp_left he.symm⟩ ``` Example use case 2 (on top of https://github.com/leanprover-community/mathlib4/pull/29610): ```lean theorem LinearMap.Eigenbasis.μ_equiv {ι ι' R G : Type} [Fintype ι] [Fintype ι'] [CommRing R] [IsDomain R] [AddCommGroup G] [Module R G] [Module.Free R G] [Module.Finite R G] {f : Module.End R G} (B₁ : f.Eigenbasis ι) (B₂ : f.Eigenbasis ι') : ∃ e : ι ≃ ι', B₁.μ = B₂.μ ∘ e := by classical have := congr(Polynomial.roots $(B₁.charpoly_eq.symm.trans B₂.charpoly_eq)) rw [Polynomial.roots_prod, Polynomial.roots_prod] at this; rotate_left · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] · simp [Finset.prod_ne_zero_iff, Polynomial.X_sub_C_ne_zero] simp_rw [Polynomial.roots_X_sub_C, Multiset.bind_singleton] at this exact ⟨Multiset.equivOfMapUnivEq this, (Multiset.compTriple_equivOfMapUnivEq this).comp_eq.symm⟩ ``` Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	9	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele']	pechersky assignee:pechersky	180-74835 5 months ago	180-74836 180 days ago	69-23034 69 days
29675	yury-harmonic author:yury-harmonic	feat(Wolstenholme): new file	Co-authored-by: @Aristotle-Harmonic --- I still need to cleanup the proof and write the docs. For now, it's just what the AI generated, forward-ported to the latest Mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted t-data	198/0	Mathlib.lean,Mathlib/Data/Nat/Choose/Wolstenholme.lean	2	5	['Alex-Linhares', 'github-actions', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	180-74264 5 months ago	245-51965 245 days ago	0-125 2 minutes
29720	javra author:javra	feat(CategoryTheory): `TransportEnrichment` and `ForgetEnrichment` as 2-functors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	63/1	Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/EnrichedCat.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-74257 5 months ago	244-53388 244 days ago	0-24 24 seconds
29827	js2357 author:js2357	feat: define two (trivial) ContinuousMulEquivs	Define two trivial `ContinuousMulEquiv`s: `ContinuousMulEquiv.piUnique` is the topological version of `MulEquiv.piUnique`. `ContinuousMulEquiv.piEquivPiSubtypeProd` is the multiplicative version of `Homeomorph.piEquivPiSubtypeProd`. Done for the FLT project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology FLT large-import	25/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-74243 5 months ago	240-76005 240 days ago	0-18297 5 hours
29947	JaafarTanoukhi author:JaafarTanoukhi	feat(Combinatorics/Digraph): Maps	Ported `SimpleGraph/Maps.lean` to `Digraph/Maps.lean` for future PRs related to issue #[26771](https://github.com/leanprover-community/mathlib4/issues/26771) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics new-contributor	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	180-74239 5 months ago	180-74240 180 days ago	54-82760 54 days
30022	ADedecker author:ADedecker	feat: theory of `IsRightUniformGroup` and `IsLeftUniformGroup`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	799/150	Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	2	7	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-74225 5 months ago	unknown	0-0 0 seconds
30042	JovanGerb author:JovanGerb	feat(push): `@[push]` attributes for `∈` in `Set`, `Finset` and `Multiset`	This PR adds `@[push]` annotations for the membership relations, for `Set`, `Finset` and `Multiset`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	171/105	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Data/DFinsupp/Interval.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Pi.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/Range.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/Finset/Sum.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Multiset/AddSub.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Dedup.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/FinsetOps.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Range.lean,Mathlib/Data/Multiset/Replicate.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Multiset/Sum.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Multiset.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/SetNotation.lean,MathlibTest/push.lean	49	14	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	180-74220 5 months ago	188-47617 188 days ago	23-81049 23 days
30330	Bergschaf author:Bergschaf	feat(Algebra/Group/Action/Equidecomp): Mathlib's definition of Equidecomposability is equivalent to the standart one using partitions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	329/1	Mathlib/Algebra/Group/Action/Equidecomp.lean	1	6	['Bergschaf', 'Felix-Weilacher', 'github-actions', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	180-74062 5 months ago	203-51502 203 days ago	15-53183 15 days
30374	FLDutchmann author:FLDutchmann	feat(Tactic): `algebra` and `polynomial` tactic suite	Implement a suite of tactics for normalizing expressions in an algebra over a ring. Handles all of the normal `ring` operations as well as scalar multiplication over a fixed base ring. Using these, implement tactics to normalize `(Mv)Polynomial` expressions into a sum-of-monomials form. Specifically, * `algebra` proves equality of expressions in an algebra over a ring like `ring1` * `algebra_nf` puts expressions in an algebra into a normal form, like `ring_nf` * `match_scalars_alg` (name pending) closes an equality goal by calling `algebra_nf` and creating side goals equating matching coefficients in the base ring. Like `match_scalars`. * `polynomial` proves equality of (mv)polynomials * `polynomial_nf` expands polynomials into a sum-of-monomials form, combining coefficients in the base ring (e.g. `C a * X + C b * X` normalizes to `C(a+b) * X` * `match_coefficients` expands polynomials and produces side goals equating matching coefficients. - [x] depends on: #31506 - [x] depends on: #31508 - [ ] depends on: #31513 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author blocked-by-other-PR t-meta	2371/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Algebra.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Tactic/Polynomial.lean,Mathlib/Tactic/Polynomial/Core.lean,MathlibTest/Polynomial.lean,MathlibTest/algebra.lean,scripts/noshake.json	9	7	['FLDutchmann', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-74043 5 months ago	unknown	0-0 0 seconds
30392	urkud author:urkud	feat: define pullback quotient maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	287/0	Mathlib.lean,Mathlib/Topology/ClusterPt.lean,Mathlib/Topology/Maps/PullbackQuotient.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-74038 5 months ago	unknown	0-0 0 seconds
30933	joelriou author:joelriou	feat(CategoryTheory): the linearization of a category	Let `C` be a category and `R` be a commutative ring. We construct a `R`-linear category `Linearization C R` and a functor `toLinearization C R : C ⥤ Linearization C R`. The morphisms in `Linearization C R` are the free `R`-modules on the types of morphisms in `C`. (In the context of singular homology with coefficients `R`, chains of a fixed degree shall identify to morphisms in `Linearization TopCat R`, and doing certain computations for arbitrary coefficients should reduce to computations with `R := ℤ`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	134/0	Mathlib.lean,Mathlib/CategoryTheory/Linear/Linearization.lean	2	4	['github-actions', 'joelriou', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-73730 5 months ago	202-15348 202 days ago	2-33570 2 days
31314	hrmacbeth author:hrmacbeth	feat: linters for recommended `field_simp` style	--- - [x] depends on: #31472 - [x] depends on: #31483 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-CI	93/1	Mathlib.lean,Mathlib/Lean/Meta/WarningAsError.lean,Mathlib/Tactic/Field.lean	3	5	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-73530 5 months ago	unknown	0-0 0 seconds
31351	grunweg author:grunweg	feat: manifolds with smooth boundary	Needs polish, and closing the remaining sorries (or deciding they can be postponed later). From my bordism theory project. --- - [x] depends on: #22070 - [x] depends on: #22128 - [x] depends on: #22131 - [x] depends on: #22082 - [x] depends on: #22113 - [x] depends on: #22105 - [x] depends on: #26099 - [x] depends on: #30049 (preliminary code clean-up) - [x] depends on: #29589 - [x] ~~depends on: https://github.com/grunweg/mathlib4/tree/mfderiv-prodmap for actually proving the mfderiv sorry about products I need~~ done now - [ ] depends on: #31200 (and its companion result, about Sum.map) - [ ] depends on #23040 for the mathlib-level definition of smooth immersions and embeddings This PR continues the work from #22059. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry	591/0	Mathlib.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-73304 5 months ago	192-70072 192 days ago	0-13 13 seconds
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra new-contributor merge-conflict awaiting-author label:t-algebra$	120/0	Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean	2	19	['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	180-71071 5 months ago	624-64185 624 days ago	48-65595 48 days
31356	adomani author:adomani	feat: add inspect-like functions	Produces a tree-like formatting for `Syntax`, `Expr` and `InfoTree`. Especially for the `InfoTree`s, there are many parts of it that do not get printed. For instance, this is how the `InfoTree`s of `set_option linter.missingDocs true` get printed: ```lean inspectIT set_option linter.missingDocs true /- commandCtx \|-Info.ofCommandInfo: Lean.Elab.Command.elabSetOption, 'set_option…gDocs true' \| \|-Info.ofCompletionInfo.CompletionInfo.option 'set_option…issingDocs' \| \|-Info.ofOptionInfo: linter.missingDocs, Linter.linter.missingDocs -/ ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	720/0	Mathlib.lean,Mathlib/Util/Inspect.lean,MathlibTest/Inspect.lean	3	3	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	kim-em assignee:kim-em	180-69260 5 months ago	180-69261 180 days ago	11-61697 11 days
31604	maksym-radziwill author:maksym-radziwill	feat: analyticity of dslope	This adds a few simple functions to show that ``dslope f a`` is analytic when ``f`` is. This is needed for Borel-Caratheodory, see https://github.com/leanprover-community/mathlib4/pull/30424 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	51/0	Mathlib.lean,Mathlib/Analysis/Analytic/Dslope.lean	2	26	['github-actions', 'grunweg', 'maksym-radziwill', 'mathlib4-merge-conflict-bot']	nobody	180-68964 5 months ago	186-23880 186 days ago	0-3879 1 hour
31738	robertmaxton42 author:robertmaxton42	feat: quivers can be represented as functors from the walking quiver	Add definitions and associated lemmas for representing quivers as functors from the category `1 ⇉ 0`, i.e. `WalkingParallelPairᵒᵖ`. New definitions: * `asFunctor` itself, which is defined as a bare function with an associated `Functorial` instance so that it can be used with generalized projection notation * `src` and `tgt`, abbreviations for `F.map left.op` and `F.map right.op` for a functor `F : WalkingParallelPairᵒᵖ ⥤ Type w` * `Vertex`, `Edges`, and `Edge`, abbreviations for `F.obj 0` (interpreted as the type of vertices), `F.obj 1` (interpreted as the total type of all edges), and `{e : F.obj 1 // src e = s ∧ tgt e = t}` for some pair of vertices `s` and `t` (interpreted as the hom-type `s ⟶ t`) * `edgeOfEq`, the equivalent of `Quiver.homOfEq` for edges in quivers in functor form. --- This PR begins the first of a series proving that the category `Quiv.{v, u}` is equivalent to the subcategory of $$\mathbf{PSh}(\mathbf{WQuiv}^\mathrm{op})$$ which are appropriately '`u`-small' and 'locally `v`-small'. The original PR (prior to the move to forks) created a custom type `WalkingQuiver` for this purpose; ultimately I found that `WalkingParallelPairᵒᵖ` served my purposes well enough. Following this PR will be one constructing the adjoint `ofFunctor`, plus several showing that `asFunctor` and `ofFunctor` can be assembled into an equivalence and proving various properties of quivers in functor form necessary for the construction of colimits. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	397/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/AsOfFunctor.lean	2	13	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'robertmaxton42']	nobody	180-68921 5 months ago	182-84036 182 days ago	0-1741 29 minutes
31590	SuccessMoses author:SuccessMoses	chore: tag `commutatorElement_def` with `simp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor merge-conflict label:t-algebra$	1/0	Mathlib/Algebra/Group/Commutator.lean	1	3	['github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	180-48946 5 months ago	180-48946 180 days ago	6-8213 6 days
25802	dagurtomas author:dagurtomas	feat(AlgebraicTopology): anodyne morphisms of simplicial sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #20201. Original PR: https://github.com/leanprover-community/mathlib4/pull/20201	WIP t-topology	145/0	Mathlib/AlgebraicTopology/Anodyne.lean,Mathlib/AlgebraicTopology/KanFibration.lean,Mathlib/CategoryTheory/MorphismProperty/WeakSaturation.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-48853 5 months ago	340-64017 340 days ago	0-2 2 seconds
6268	eric-wieser author:eric-wieser	fix: fixups to #3838	This is an attempt to make #3838 universe polymorphic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) * Depends on #6271 * Depends on #8876	merge-conflict WIP	186/107	Mathlib/Control/Random.lean,Mathlib/Tactic/SlimCheck.lean,Mathlib/Testing/SlimCheck/Functions.lean,Mathlib/Testing/SlimCheck/Gen.lean,Mathlib/Testing/SlimCheck/Sampleable.lean,Mathlib/Testing/SlimCheck/Testable.lean,test/slim_check.lean	7	10	['github-actions', 'kim-em']	nobody	180-48197 5 months ago	unknown	0-0 0 seconds
6859	MohanadAhmed author:MohanadAhmed	feat: TryLean4Bundle: Windows Bundle Creator	# `TryLean4Bundle`: Windows Bundle Creator A Windows batch script and a CI yml file that create an self extracting archive. The user should 1. just download the archive, 2. double click the archive to expand 3. double click the `RunLean.bat` script in the expanded archive. The script currently downloads 7 dependencies into CI then unpacks them in the appropriate locations and finally packs them back. To try a bundle created using these scripts but from a different repo see (https://github.com/MohanadAhmed/TryLean4Bundle/releases) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP help-wanted CI	114/0	.github/workflows/mk_windows_bundle.yml,scripts/windowsBundle.bat	2	0	[]	nobody	180-48189 5 months ago	993-16902 993 days ago	0-434 7 minutes
6993	jjaassoonn author:jjaassoonn	feat: lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48184 5 months ago	850-52937 850 days ago	103-330 103 days
7427	MohanadAhmed author:MohanadAhmed	feat: eigenvalues sorted in ascending/descending order	In the file `Analysis.InnerProductSpace.Spectrum` todo notes were left saying: > TODO Postcompose with a permutation so that these eigenvectors are listed in increasing order of eigenvalue. > TODO Postcompose with a permutation so that these eigenvalues are listed in increasing order. - This is a start in that direction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	162/4	Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiLp.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean	3	0	[]	nobody	180-48152 5 months ago	unknown	0-0 0 seconds
9339	FMLJohn author:FMLJohn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	402/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	8	11	['FMLJohn', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48137 5 months ago	864-53115 864 days ago	6-63597 6 days
9564	AntoineChambert-Loir author:AntoineChambert-Loir	chore: weaken commutativity assumptions for AdjoinRoot.lift and AdjoinRoot.liftHom	I weaken a commutativity assumption for docs#AdjoinRoot.liftHom that the target algebra be commutative. It is only assumed to be a Semiring. For that, I need to generalize docs#AdjoinRoot.lift which takes `i : R ->+* S`, `a : S` with `f.eval₂ i a = 0` and defines `AdjoinRoot f ->+* S` that extends `i ` and sends `AdjoinRoot.root f` to `a`. --- The initial version of the PR was to define `AdjoinRoot.lift'` where `S` is only a Semiring, with the additional assumption `hcomm : ∀ r, Commute (i r) a` that the element `a` commutes with the image of `i`. @jcommelin suggested to provide this argument as an `autoParam`, filled in by an ad hoc `commutativity` tactic. However, such an argument cannot be made implicit and a first version required to have this argument given each time, most of the time by `_`, even for all subsequent lemmas, `AdjoinRoot.lift_mk`, etc. To avoid this, I tried to make this assumption a `⦃hcomm : ∀ r, Commute (i r) a⦄`. This appears to have some side effects that proofs using an `exact` tactic or in term mode do not work well, but one can resort on `by simp […]`. Maybe @eric-wieser or @Vierkantor will have opinions on that. In some cases one can still give the argument as `(hcomm := by commutativity)`. (There are 3 options : - separate lemmas for the fully commutative case and for the case where a proof is needed - using the `commutativity` tactic, but with an argument `_` sometimes - using the optional argument.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	146/30	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Commutativity.lean,Mathlib/Tactic/Commutativity/Init.lean	8	14	['AntoineChambert-Loir', 'Vierkantor', 'eric-wieser', 'jcommelin']	nobody	180-48131 5 months ago	777-40437 777 days ago	16-71959 16 days
10026	madvorak author:madvorak	feat: linear programming according to Antoine Chambert-Loir's book	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	10	['eric-wieser', 'madvorak', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	180-48125 5 months ago	684-70934 684 days ago	154-48765 154 days
10159	madvorak author:madvorak	feat: linear programming according to Antoine Chambert-Loir's book — affine version	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	83/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	8	['eric-wieser', 'madvorak', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	180-48118 5 months ago	684-70917 684 days ago	152-72231 152 days
10349	Shamrock-Frost author:Shamrock-Frost	refactor(CategoryTheory/MorphismProperty): some clean-ups	We make explicit some of the galois connections/closure operators in the existing MorphismProperty file, rewrite some proofs to take advantage of these structures, and change map/inverseImage by (1) swapping their argument order, for consistency with Set.range and Set.preimage and (2) making "map" perform the strict, evil map while "essMap" (previously called map) forms the closure of the image under isomorphisms. Finally we add `IsMultiplicative` instances for isos/epis/monos, with an eye towards constructing the wide subcategory on these classes of maps. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	474/318	Mathlib/CategoryTheory/Localization/Composition.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/MorphismProperty.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Closure.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/RelIso/Basic.lean	8	1	['leanprover-community-mathlib4-bot']	nobody	180-48095 5 months ago	831-16839 831 days ago	0-418 6 minutes
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-topology new-contributor	2137/1	.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	6	47	['github-actions', 'jcommelin']	nobody	180-48087 5 months ago	810-15532 810 days ago	1-20227 1 day
11800	JADekker author:JADekker	feat: KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology awaiting-zulip	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	180-48053 5 months ago	655-68335 655 days ago	123-25636 123 days
12087	JADekker author:JADekker	feat: complete API for K-Lindelöf spaces	--- - [ ] depends on: #11800 (which is now awaiting a design decision) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology blocked-by-other-PR	789/17	Mathlib.lean,Mathlib/Order/Filter/CardinalInter.lean,Mathlib/Topology/Compactness/KLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	180-48046 5 months ago	655-68210 655 days ago	99-11243 99 days
12251	ScottCarnahan author:ScottCarnahan	refactor(RingTheory/HahnSeries): several generalizations	This PR is a container for several smaller PRs that refactor and generalize the existing Hahn series theory. It is (I think) all we need from Hahn series to get a palatable theory of vertex algebras off the ground (other prerequisites from Lie algebras will eventually come in a different PR). Major changes include: - equivalence between iterated Hahn series and Hahn series on Lex products. - introduce `orderTop` and `leadingCoeff` functions. Here, `orderTop` is a `WithTop Γ`-valued version of `order` that does not need `[Zero Γ]` and `leadingCoeff` returns the coefficient of the minimal element of support (or zero if empty). - introduce ordered and cancellative vector addition classes together with some basic theory e.g., finiteness of antidiagonals for partially well-ordered sets. - `HahnSeries Γ R`-module structure on `HahnModule Γ' R V`, when `Γ` is an `OrderedCancelAddCommMonoid`, `Γ'` is a `PartialOrder` with `OrderedCancelVAdd Γ Γ'`, `R` is a semiring, and `V` is an `R`-module. - Move `AddVal` to a separate file - the underlying function is just `orderTop`, but the description of the valuation needs an additional import and an `IsDomain` hypothesis. Results that depended on `AddVal` are changed to use `orderTop` and generalized. --- - [x] depends on: #10781 [HahnSeries on Lex product] - [x] depends on: #10846 [HahnModule] - [x] depends on: #11965 [orderTop] - [x] depends on: #11979 [OrderedVAdd] - [x] depends on: #12996 [leadingTerm] - [x] depends on: #16649 - [x] depends on: #16701 - [x] depends on: #17004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra t-order label:t-algebra$	1059/97	Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-48031 5 months ago	666-14178 666 days ago	42-37118 42 days
12394	JADekker author:JADekker	feat: define pre-tight and tight measures	Define tight measures (by first defining separable and pre-tight measures). Define some api for all three concepts Prove Ulam's tightness theorem and a strengthened version of this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict awaiting-author t-measure-probability	503/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean	2	34	['EtienneC30', 'JADekker', 'github-actions', 'sgouezel']	nobody	180-48026 5 months ago	742-56077 742 days ago	2-24297 2 days
12452	JADekker author:JADekker	feat(Cocardinal): add some more api	Just a small PR to add a bit more API for cocardinal filters. Not everything seems to generalise nicely from cofinite, so I didn't include such results. Currently the file has one `sorry`, I'm not sure how to complete this proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI	75/0	Mathlib/Order/Filter/Cocardinal.lean	1	0	[]	nobody	180-48022 5 months ago	752-44302 752 days ago	0-2075 34 minutes
14426	adomani author:adomani	feat: `#min_imps` command (development branch)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	142/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinImports.lean,test/MinImports.lean	4	2	['adomani', 'github-actions']	nobody	180-47993 5 months ago	683-27474 683 days ago	0-31 31 seconds
14686	smorel394 author:smorel394	feat(AlgebraicGeometry/Grassmannian): define the Grassmannian scheme	# The Grassmannian scheme Define the Grassmannian scheme by gluing affine charts. We fix a commutative ring `K`, a free `K`-module of finite type `V` and two natural numbers `r` and `c`. The scheme we define should parametrize surjective `K`-linear maps `V →ₗ[K] (Fin r → K)`, assuming that `V` is of rank `r + c`. We actually define the scheme without assuming the condition on the rank of `V`, but it is empty unless the rank of `V` is `r + c`. Main definitions: * `Grassmannian.glueData K V r c`: the `AlgebraicGeometry.Scheme.GlueData` defining the Grassmannian scheme. * `Grassmannian K V r c`: the Grassmannian scheme, defined as `(Grassmannian.glueData K V r c).glued`. * `Grassmannian.structMorphism K V r c`: the structural morphism from `Grassmannian K V r c` to `Spec K`. # Implementation We use as index type for the charts the type `Basis (Fin (r + c)) K V` (so this is empty unless `V` is free of rank `r + c`). All the charts are the same and equal to the affine space with coordinates indexed by `Fin c × Fin r`, that is, to `Spec (MvPolynomial (Fin c × Fin r) K)`. The idea is that, for `i` in `Basis (Fin (r + c)) K V`, the corresponding chart will parametrize all surjective `K`-linear maps `φ : V →ₗ[K] (Fin r → K)` that become isomorphisms when restricted to the `K`-submodule generated by the first `r` vectors of the basis `i`. To get the point of the chart corresponding to `φ`, we take the matrix of `φ` in the basis `i` of `V` and the canonical basis of `Fin r → K`, we divide it on the right by its top `r × r` square submatrix (which is invertible by assumption), and we taken the botton `c × r` submatrix. This is almost the usual description of the Grassmannian by charts, with three differences: * We consider the Grassmannian parametrizing `r`-dimensional quotients of `V` instead of `r`-dimensional subspaces of `V`, because this is more natural when working over a general ring (or scheme). * In the usual description, we fix a basis of `V` and index the chart by its subsets `I` of cardinality `r`. Here, to avoid making a choice, we instead index charts by the set of bases of `V` and always choose the subset `I` to consist of the first `r` vectors. * Instead of working with `FiniteDimensional.finrank K V - r`, which would cause technical trouble because of the way subtraction works on `ℕ`, we introduce the codimension `c` as an auxiliary variable, and our constructions are only interesting when `r + c` is equal to `FiniteDimensional.finrank K V`. # Why is this a WIP * There a bunch of lemmas in the file `AlgebraicGeometry/Grassmannian/Lemmas.lean` that either should not be necessary or should be put in another PR for some other part of mathlib. * The proofs in `AlgebraicGeometry/Grassmannian/Basic.lean` are probably too complicated, and the names suck. # Notes. This contribution was created as part of the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #14711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP workshop-AIM-AG-2024 merge-conflict t-algebraic-geometry	1002/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Grassmannian/Basic.lean,Mathlib/AlgebraicGeometry/Grassmannian/Lemmas.lean	3	15	['erdOne', 'github-actions', 'joelriou', 'leanprover-community-mathlib4-bot', 'smorel394']	nobody	180-47982 5 months ago	675-33989 675 days ago	0-201 3 minutes
17071	ScottCarnahan author:ScottCarnahan	feat(LinearAlgebra/RootSystem): separation, base, cartanMatrix	This PR defines an abstract separation structure for roots, together with the associated base and Cartan Matrix. In general, the good properties will follow from additional order hypotheses on the base ring (implemented in a future PR). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	111/0	Mathlib.lean,Mathlib/LinearAlgebra/RootSystem/Separation.lean	2	1	['github-actions']	nobody	180-47947 5 months ago	581-38407 581 days ago	20-56416 20 days
17471	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Sheaf): the sheaf of relative differentials	--- - [ ] depends on: #17366 - [x] depends on: #17388 - [x] depends on: #16755 - [ ] depends on: #17469 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory large-import merge-conflict t-algebraic-geometry	740/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/AlgebraicGeometry/Modules/Differentials.lean,Mathlib/Geometry/RingedSpace/SheafedSpace.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-47940 5 months ago	unknown	0-0 0 seconds
18626	hannahfechtner author:hannahfechtner	feat: define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	180-47934 5 months ago	543-54813 543 days ago	15-38478 15 days
18784	erdOne author:erdOne	feat(AlgebraicGeometry): use `addMorphismPropertyInstances`	--- - [ ] depends on: #18785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry blocked-by-other-PR	435/91	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/FinitePresentation.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/AlgebraicGeometry/Morphisms/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/CategoryTheory/MorphismProperty/Composition.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-47925 5 months ago	555-71130 555 days ago	0-1869 31 minutes
19062	hannahfechtner author:hannahfechtner	feat(Algebra/PresentedMonoid/Basic): facts about rel	Add in a number of useful theorems (reflexivity, closure under multiplication) and lemmas about when the PresentedMonoid.rel holds as an API for users --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	38/0	Mathlib/GroupTheory/Congruence/Defs.lean	1	8	['github-actions', 'hannahfechtner', 'kbuzzard', 'riccardobrasca']	nobody	180-47920 5 months ago	447-58880 447 days ago	87-64575 87 days
19607	madvorak author:madvorak	feat: block matrices are totally unimodular	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/TU.20block.20matrix.20.2319607 - [ ] depends on: #19323 - [ ] depends on: #20428 - [ ] depends on: #20433 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR	156/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean,Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean	3	11	['github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot']	nobody	180-47910 5 months ago	unknown	0-0 0 seconds
20029	FrederickPu author:FrederickPu	feat(Tactic/simps): allow for Config attributes to be set directly	Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895 Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values. Ex: ``` initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false) ``` These config options are then converted into projections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP new-contributor t-meta	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	180-47871 5 months ago	516-65120 516 days ago	0-34081 9 hours
21269	658060 author:658060	feat(CategoryTheory/Topos): basic definitions and results in topos theory	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory new-contributor merge-conflict awaiting-author	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['658060', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	180-47844 5 months ago	473-26658 473 days ago	0-13879 3 hours
22805	ScottCarnahan author:ScottCarnahan	feat(FieldTheory/Finite): fixed points of Frobenius automorphism	This PR identifies the prime field with the fixed points of frobenius. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	325/7	Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean	4	1	['github-actions']	nobody	180-47832 5 months ago	unknown	0-0 0 seconds
23772	SEU-Prime author:SEU-Prime	feat: Amice equivalence	i built amice equiv [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-number-theory	283/0	Mathlib/NumberTheory/Padics/Amice.lean	1	2	['grunweg']	nobody	180-47813 5 months ago	406-57064 406 days ago	0-4483 1 hour
23990	robertmaxton42 author:robertmaxton42	feat(Types.Colimits): Quot is functorial and colimitEquivQuot is natural	Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	180-47727 5 months ago	392-46662 392 days ago	8-27136 8 days
24533	robertmaxton42 author:robertmaxton42	feat(ULift): conjugation by ULift.up/down, misc cast/heq lemmas	* Adds the convenience def `ULift.conj x := `down (f (up x))`, and corresponding basic lemmas * Adds lemmas showing that `ULift.up` and `.down` commute with casts and preserve `HEq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	31/0	Mathlib/Data/ULift.lean	1	23	['eric-wieser', 'github-actions', 'grunweg', 'robertmaxton42']	nobody	180-47723 5 months ago	263-75511 263 days ago	118-2181 118 days
24690	ScottCarnahan author:ScottCarnahan	feat(Data.Prod): reverse lexicographic order	This PR implements the type synonym RevLex as a one-field structure, defines an order on products, and proves an order isomorphism with the Lex product with factors switched. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	141/0	Mathlib.lean,Mathlib/Data/Prod/RevLex.lean	2	5	['ScottCarnahan', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47713 5 months ago	356-6838 356 days ago	19-33859 19 days
24692	ScottCarnahan author:ScottCarnahan	feat(RingTheory/HahnSeries/Basic): isomorphism of Hahn series induced by order isomorphism	This PR introduces an isomorphism of Hahn series induced by an order isomorphism on the exponent posets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	35/0	Mathlib/RingTheory/HahnSeries/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47707 5 months ago	343-78162 343 days ago	31-47622 31 days
25034	ScottCarnahan author:ScottCarnahan	feat(Algebra/Module/Equiv/Basic): Restriction of scalars from a semilinear equivalence to a linear equivalence	If `M` and `M₂` are both `R`-modules and modules for `S` and `S₂`, respectively, then for any ring isomorphism `e` between `S` and `S₂` and any `e`-semilinear equivalence between `M` and `M₂` that respects the `R`-action, we obtain an `R`-linear equivalence between `M` and `M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	28/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	1	['github-actions']	nobody	180-47700 5 months ago	343-78124 343 days ago	20-11468 20 days
25831	ScottCarnahan author:ScottCarnahan	feat(RingTheory/HahnSeries): Powers of a binomial	This PR introduces powers of a binomial `single g 1 - single g' 1` in a Hahn series, where the powers take values in a binomial ring. These series behave as one would expect with respect to addition of powers, and comparison with natural number powers. They are often used in the theory of vertex algebras. --- - [x] depends on: #25830 - [x] depends on: #27497 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24102. Original PR: https://github.com/leanprover-community/mathlib4/pull/24102	merge-conflict WIP t-ring-theory	132/0	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	5	14	['ScottCarnahan', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	180-47672 5 months ago	196-65124 196 days ago	80-45817 80 days
26455	ScottCarnahan author:ScottCarnahan	feat(LinearAlgebra/RootSystem): API for CartanMatrix	Some attempts at working out good ways to eliminate bad Cartan matrices. Very much WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	815/26	Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/CartanMatrix.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Relations.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean	9	8	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-47546 5 months ago	326-17216 326 days ago	0-17731 4 hours
26804	kckennylau author:kckennylau	feat(SetTheory): ZFSet is a model of ZFC	--- Depends on: * [ ] #26644 `Mathlib/SetTheory/ZFC/Model.lean` is the main file, and it starts at Line 346. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-set-theory	1245/0	Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,Mathlib/SetTheory/ZFC/Model.lean,docs/references.bib	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	180-47499 5 months ago	317-12224 317 days ago	0-163 2 minutes
26890	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): more API for `DayFunctor`	We provide some lemmas that helps characterizing the monoidal structure on `DayFunctor`, they are special cases of the lemmas for `LawfulDayConvolutionMonoidalCategoryStruct`. --- - [x] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-47487 5 months ago	314-72496 314 days ago	0-517 8 minutes
26310	kckennylau author:kckennylau	feat: binary forms	This PR provides the basic definition of binary forms, which are homogeneous polynomials in two variables. --- - [ ] depends on: #26312 - [ ] depends on: #26313 - [ ] depends on: #26314 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	14	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	180-47465 5 months ago	272-44486 272 days ago	57-1096 57 days
26283	kckennylau author:kckennylau	feat: resultant of polynomials	--- This is a WIP PR for resultant for me to get cache. PRs produced: * [x] #25139 (migrated to #26091) * [x] #25270 * [x] #25279 * [x] #25293 * [x] #25294 * [x] #25305 * [x] #26285 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	1190/0	Mathlib.lean,Mathlib/Algebra/Polynomial/Resultant/Basic.lean,Mathlib/Algebra/Polynomial/Resultant/MvPolynomial.lean,Mathlib/RingTheory/Polynomial/Discriminant.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47441 5 months ago	330-16155 330 days ago	0-19 19 seconds
27991	sinianluoye author:sinianluoye	feat(Rat): add Rat.den_eq_of_add_den_eq_one and its dependent lemmas	```lean4 example {q r : ℚ} (h : (q + r).den = 1) : q.den = r.den := by ``` It is so simple, but I couldn't find it in current mathlib repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	22/0	Mathlib/Data/Rat/Lemmas.lean	1	33	['github-actions', 'kim-em', 'mathlib-bors', 'pechersky', 'sinianluoye', 'themathqueen']	pechersky assignee:pechersky	180-47410 5 months ago	211-71004 211 days ago	74-56654 74 days
28215	5hv5hvnk author:5hv5hvnk	feat: strong and Weak connectivity for Digraphs	strong and weak connectivity in Digraphs --- Should resolve a part of issue #26771 Main additions in the PR: 1. Walks in Digraphs (Walk.lean) - Basic walk structure with start and end vertices - Support for walk operations: append, reverse, length - Support functions: getVert, copy, support 2. Walk Decompositions (WalkDecomp.lean) - takeUntil and dropUntil functions to split walks - rotate operation for loop walks - Theorems relating to walk decomposition properties 3. Subgraphs (subgraph.lean) - Subgraph structure for digraphs - Induced and spanning subgraph predicates - Lattice structure (sup, inf, top, bot) - Coercion to standalone digraphs 4. Paths (Paths.lean) - Trail, Path, Circuit, Cycle definitions - Path structure with no repeating vertices - Theorems relating different path types - Basic connectivity definitions (reachable, weakly/strongly connected) 5. Connectivity (Connected.lean) - Reachability relations and properties - Strong and weak connectivity definitions - Connected component types: - StronglyConnectedComponent - WeaklyConnectedComponent - ConnectedComponent - Component properties and equivalence relations --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor merge-conflict awaiting-author t-combinatorics	1266/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Connected.lean,Mathlib/Combinatorics/Digraph/Paths.lean,Mathlib/Combinatorics/Digraph/Subgraph.lean,Mathlib/Combinatorics/Digraph/Walk.lean,Mathlib/Combinatorics/Digraph/WalkDecomp.lean	6	4	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-47389 5 months ago	268-44971 268 days ago	12-41939 12 days
28970	Whysoserioushah author:Whysoserioushah	feat(Algebra/Algebra/ReducedNorm): defines reduced norm and trace	TODO : 1. add the theorem proving reduced charpoly is independent from the choice of AlgEquiv (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Algebra.2ETensorProduct.2Eassoc/with/536349758)) 2. prove reduced charpoly is "actually" in the polynomial ring of base field (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.9C.94.20Refactor.20Subfield)) therefore content about this topic is basically the best I could do for now :-( --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	66/0	Mathlib.lean,Mathlib/Algebra/Algebra/ReducedNorm.lean	2	19	['Whysoserioushah', 'chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'kbuzzard', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	180-47337 5 months ago	224-38860 224 days ago	40-66926 40 days
29212	Whysoserioushah author:Whysoserioushah	feat(Algebra/CrossProductAlgebra/Defs): define Cross Product Algebra	PS: All to-dos listed in the file has been fully sorry-freed and will be (slowly) upstreamed by either me or Yaël Co-authored-by: Yaël Dillies Co-authored-by: Jujian Zhang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	270/0	Mathlib.lean,Mathlib/RepresentationTheory/CrossProductAlgebra/Defs.lean,docs/references.bib	3	9	['Whysoserioushah', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47326 5 months ago	253-74511 253 days ago	5-62087 5 days
29514	grunweg author:grunweg	feat(CI): use more strict mode	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP CI	192/33	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check_title_labels.lean	10	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47285 5 months ago	250-36860 250 days ago	0-1 1 second
29574	JarodAlper author:JarodAlper	feat: regular local rings are domains	We have added three new files in Mathlib/RingTheory/LocalRing * EmbeddingDimension.lean * LocalRingDimension.lean * RegularLocalRings.lean We have added two lemmas and an instance in Mathlib/RingTheory/LocalRing/RingHom/Basic.lean This work was done by Jarod Alper and Brian Nugent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	910/3	Mathlib.lean,Mathlib/RingTheory/LocalRing/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRing/LocalRingDimension.lean,Mathlib/RingTheory/LocalRing/RegularLocalRings.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47278 5 months ago	247-48533 247 days ago	1-50449 1 day
28718	imbrem author:imbrem	feat: class for chosen finite coproducts	Added basic `ChosenFiniteCoproducts` class, and started porting some of the lemmas about `ChosenFiniteProducts` suitably translated --- This, combined with #20182 modified to use chosen finite coproducts and premonoidal categories (#21488), should be enough for me to formalize strong Elgot categories, and hence a lot of categorical iteration theory for my PhD thesis. Re-done from #21603 to deal with changes in #24399 and #24390 Eventually, if we really want to harmonize approaches, we could introduce an `AddMonoidalCategory` struct and do the analogous to #24399 and #24390 for additive monoidal structure, but that seems like a massive overcomplication for now. It would allow formalizing fun things like rig categories, though. - [ ] depends on: #30150	blocked-by-other-PR t-category-theory new-contributor merge-conflict awaiting-author	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	9	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	180-47190 5 months ago	270-83744 270 days ago	0-24930 6 hours
30366	sinhp author:sinhp	feat(CategoryTheory): The Preliminaries for Locally Cartesian Closed Categories	See https://github.com/leanprover-community/mathlib4/pull/21525 This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). First, we develop a computable implementation of pullbacks, by introducing a new type-class `ChosenPullback`. The non-computable `HasPullbacksAlong` and `HasPullbacks` predicates yield instances of `ChosenPullback` using global choice, but interestingly in the category of types every morphism has chosen pullbacks. Also, cartesian monoidal categories, morphisms to the terminal object and the product projections have chosen pullbacks. We prove that `ChosenPullback` has good closure properties, e.g., isos have chosen pullbacks, and composition of morphisms with chosen pullbacks have chosen pullbacks. Separately, we prove that pull-push along a morphism with chosen pullbacks gives the (cartesian) binary product of that morphism, seen as an object of a slice category, and any other object of the same slice category. In fact, we also prove the stronger statement, namely that the pull-push composition `(Over.ChosenPullback.pullback Z.hom) ⋙ (Over.map Z.hom)` is naturally isomorphic to the right tensor product functor `_ × Y` in `Over X`. _This is going to be crucial in our mate-based approach to LCCCs_. Also, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be used in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	4865/526	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/Grp/Subobject.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/CharP/Frobenius.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomologicalFunctor.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/AlgebraicGeometry/Modules/Presheaf.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/Calculus/IteratedDeriv/ConvergenceOnBall.lean,Mathlib/Analysis/Complex/OperatorNorm.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Basic.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Sheaf.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Bicategory/Strict/Pseudofunctor.lean,Mathlib/CategoryTheory/Category/ULift.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/Small.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Discrete/StructuredArrow.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Generator/Abelian.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean,Mathlib/CategoryTheory/GuitartExact/KanExtension.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Filtered.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Final/Connected.lean,Mathlib/CategoryTheory/Limits/Final/Type.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Basic.lean,Mathlib/CategoryTheory/Limits/Preserves/Filtered.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Prelim.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/CategoryTheory/Sites/Equivalence.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Sites/PreservesSheafification.lean,Mathlib/CategoryTheory/Sites/Whiskering.lean,Mathlib/Combinatorics/Enumerative/Bell.lean,Mathlib/Condensed/Discrete/Basic.lean,Mathlib/Condensed/Light/AB.lean,Mathlib/Condensed/Light/CartesianClosed.lean,Mathlib/Condensed/Light/Instances.lean,Mathlib/Condensed/Light/Module.lean,Mathlib/Data/Rel/Separated.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean	131	40	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	180-47164 5 months ago	202-29328 202 days ago	3-54729 3 days
26765	KiringYJ author:KiringYJ	feat(MeasureTheory/PiSystem): add π-λ theorem and SetLike instance	Add two small features to `MeasureTheory/PiSystem`: 1. SetLike instance `instance : SetLike (DynkinSystem α) (Set α)` This lets us write `s ⊆ d` and `t ∈ d` for a DynkinSystem `d`, matching usual mathlib style. 2. `DynkinSystem.pi_lambda` lemma Classical π‑λ theorem: if a π‑system `s` is contained in a Dynkin system `d`, every set measurable for `σ(s)` is also in `d`. Currently, mathlib exposes this result only indirectly (e.g. via `generateFrom_eq`). Although logically equivalent, it is not obvious at first glance that those lemmas are the π‑λ theorem. The new lemma states the result in its familiar textbook form, so users can recognise and cite it immediately. Both pieces are under 10 lines, term‑mode only, and do not modify existing APIs. No breaking changes. No dependencies.	awaiting-author t-measure-probability new-contributor	13/0	Mathlib/MeasureTheory/PiSystem.lean	1	14	['EtienneC30', 'KiringYJ', 'dagurtomas', 'github-actions', 'ocfnash']	RemyDegenne assignee:RemyDegenne	180-33586 5 months ago	180-33586 180 days ago	138-3922 138 days
29409	Julian author:Julian	feat(Mathlib/Analysis): deriv_eq_self and deriv_exp_iff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-analysis	29/0	Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean	1	9	['Julian', 'Paul-Lez', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	179-47551 5 months ago	237-38958 237 days ago	15-76317 15 days
31513	FLDutchmann author:FLDutchmann	feat(Tactic): `polynomial` tactic	Implement tactic for proving equality of polynomials. This tactic is part of a larger suite (see https://github.com/leanprover-community/mathlib4/pull/30374). - [x] depends on: #31508 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict blocked-by-other-PR	1824/6	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Polynomial/Basic.lean,Mathlib/Tactic/Polynomial/Core.lean,MathlibTest/Polynomial.lean	10	16	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	Vierkantor and joneugster assignee:Vierkantor assignee:joneugster	179-36733 5 months ago	10-45423 10 days ago	13-3667 13 days
27306	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	This PR continues the work from #22196. Original PR: https://github.com/leanprover-community/mathlib4/pull/22196	t-meta merge-conflict	789/2	Mathlib.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LieAlgebra/Basic.lean,Mathlib/Tactic/LieAlgebra/LieRingNF.lean,Mathlib/Util/AtomM.lean,MathlibTest/lie_ring.lean,scripts/noshake.json	8	34	['FLDutchmann', 'JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'xyzw12345']	JovanGerb assignee:JovanGerb	178-63263 5 months ago	182-60002 182 days ago	114-72392 114 days
27694	grunweg author:grunweg	feat: Gram-Schmidt orthonormalisation preserves continuity of sections	provided the bundle metric used in the process is continuous. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- - [ ] depends on: #27024 - [x] depends on: #27021 Baby version of #27025. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry blocked-by-other-PR	390/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	178-26275 5 months ago	292-38636 292 days ago	0-696 11 minutes
27025	grunweg author:grunweg	feat: Gram-Schmidt procedure on smooth vector bundles yields smooth sections	For the Gram-Schmidt process on a vector bundle, deduce that smoothness of the bundle metric implies smoothness of the resulting sections. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- A few sorries remain to prove the continuous case. - [x] depends on: #27021 - [x] depends on: #27023 - [ ] depends on: #27024 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry blocked-by-other-PR	927/11	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/Elaborators.lean,Mathlib/Geometry/Manifold/Traces.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,scripts/noshake.json	6	6	['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	178-26271 5 months ago	310-70345 310 days ago	0-218 3 minutes
30637	strihanje01 author:strihanje01	feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions	add Lindstrom's theorem and its strengthening for equal intersections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	209/0	Mathlib/Combinatorics/SetFamily/Lindstrom.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	177-55735 5 months ago	180-73894 180 days ago	31-61152 31 days
31949	ADedecker author:ADedecker	chore: prefer `Pi.single i 1 j` over `fun j => if i = j then 1 else 0`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	23/21	Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Topology/Algebra/Module/Basic.lean	5	5	['eric-wieser', 'github-actions', 'themathqueen']	nobody	177-22084 5 months ago	177-22084 177 days ago	0-21800 6 hours
25902	pfaffelh author:pfaffelh	feat: The finite product of semi-rings (in terms of measure theory) is a semi-ring.	~~Move results for rings (in terms of measure theory) to a separate file; was in Semiring.lean before.~~ For `∀ i ∈ s, IsSetSemiring (C i))`, the product `s.pi '' s.pi C` is a semiring. Prove two auxiliary lemmas in `Data.Set.Prod` needed on the way. --- This PR continues the work from #22714. Original PR: https://github.com/leanprover-community/mathlib4/pull/22714	t-measure-probability brownian large-import merge-conflict awaiting-author	260/14	Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Pi.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/MeasureTheory/SetSemiring.lean	5	7	['github-actions', 'mathlib4-merge-conflict-bot', 'sgouezel']	kex-y assignee:kex-y	176-52730 5 months ago	241-61530 241 days ago	29-55524 29 days
31571	erdOne author:erdOne	feat(RingTheory): existence of local algebra with given residue field	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory	225/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/SeparableResidueField.lean	2	7	['chrisflav', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	176-27519 5 months ago	176-30976 176 days ago	9-73312 9 days
29517	pechersky author:pechersky	feat(RingTheory/Torsion): torsion = union of roots of unity	with additional API for Associates and rootsOfUnity sups --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #29988 - [x] depends on: #29989 - [x] depends on: #29990 - [x] depends on: #29991	merge-conflict awaiting-author t-algebra label:t-algebra$	149/8	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/RingTheory/RootsOfUnity/Basic.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Torsion.lean	5	35	['chrisflav', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	chrisflav assignee:chrisflav	176-20343 5 months ago	196-28146 196 days ago	37-73610 37 days
24627	pechersky author:pechersky	feat(Topology/Algebra/Valued): `IsLinearTopology 𝒪[K] K` and `𝒪[K] 𝒪[K]`	as well as `IsLinearTopology ℤ_[p] ℤ_[p]` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26829	merge-conflict awaiting-author t-topology	219/26	Mathlib.lean,Mathlib/NumberTheory/Padics/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean	5	55	['ADedecker', 'erdOne', 'faenuccio', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	jcommelin assignee:jcommelin	175-60465 5 months ago	180-75861 180 days ago	36-378 36 days
31948	ADedecker author:ADedecker	feat: move `ContinuousSMul` to a finite extension with the module topology	My motivation is the following: to define the topology on test functions (see #31806), we take the inductive limit in the category of real locally convex topological vector spaces (we don't want the result to depend on the base field!). But then, we need a way to get that complex-valued test functions are also a complex topological vector space, which we will obtain by combining this PR with [isModuleTopologyOfFiniteDimensional](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Algebra/Module/FiniteDimension.html#isModuleTopologyOfFiniteDimensional). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	109/57	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/ModuleTopology.lean	8	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	175-18732 5 months ago	unknown	0-0 0 seconds
24016	plp127 author:plp127	feat: fine uniformity	Adds the fine uniformity, and proves some properties. --- - [ ] depends on: #24096 for showing the induced topology is equal on completely regular spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	283/0	Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	175-7854 5 months ago	397-16604 397 days ago	2-85308 2 days
30995	kckennylau author:kckennylau	feat(RingTheory): replace ofLinearEquiv with limit	For an `I`-adically complete `M` we define `limit : AdicCompletion I M ≃ₗ[R] M`. This replaces the existing `ofLinearEquiv : M ≃ₗ[R] AdicCompletion I M` which goes in the opposite direction, and should make #30989 and subsequent PR's smoother. It is intended to be used together with [AdicCompletion.mk](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/AdicCompletion/Basic.html#AdicCompletion.mk) : `AdicCompletion.AdicCauchySequence I M →ₗ[R] AdicCompletion I M`. We also introduce `adicExpansion (ϖ : R) (hϖ : ϖ ∈ I) : (ℕ → M) →ₗ[R] AdicCauchySequence I M`, which sends a sequence `a : ℕ → M` to the Cauchy sequence `∑ ϖ ^ i • a i`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	77/49	Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/RingHom.lean	3	8	['erdOne', 'github-actions', 'jjdishere', 'kckennylau', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	174-77118 5 months ago	177-19803 177 days ago	13-8190 13 days
32094	grunweg author:grunweg	feat(runLinter): allow only running certain linters	This adds a script `run_linter`, which is a fork of batteries' `runLinter` with extra features: - rewrite as a CLI app, so --help messages etc. come for free - add a `--list` option, which prints the list of linters it was about to run, and exists - add `--select`, `--ignore` and `--only` options which ensure certain linters are always run, never resp. that only a certain list of linters are run. (`add` takes priority over `exclude` or `only`.) - add an `update_only_remove` flag which only runs linters mentioned in the `nolints` file: this only removes entries (by design), but is often much faster. - renamed to `run_linter`: actually, per the [zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Naming.20convention/near/450896930), this should be `run-linter` --- and one could as well use the opportunity to rename this to e.g. `env-linter`. Asked [here](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Configuring.2Fmodernizing.20runLinter). Intended use cases 1. Run `update_only_remove` when updating the nolints file. In fact, it is so fast that it could even run during regular CI, after the normal `lint` step... 2. Run the mathlib linters locally. The simpNF linters are slow enough (for a reason, but still) that doing so is currently annoying. On my notebook, they can easily take half an hour, during which my notebook is otherwise hardly usable. 3. You're developing a new linter and only want to run that one (as there was no change about the other ones). Probably, the nicest result would be this PR landing in batteries (perhaps in pieces) instead of here. --- I'm not happy about one detail: - many options take an `Array String`: how can I pass this to the executable? This is not obvious to me... - TODO: address the comment at https://github.com/leanprover-community/mathlib4/pull/14654#discussion_r1685824917 Continuation of #14654. Proof-of-concept; the real implementation should be in batteries/a separate repository. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter CI	154/0	lakefile.lean,scripts/run_linter.lean	2	1	['github-actions']	nobody	174-61590 5 months ago	174-61656 174 days ago	174-61649 174 days
32095	grunweg author:grunweg	chore: fix some explicitVarOfIff linter errors	Needs a merge, and removing the linter changes... should be re-done and split out! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP merge-conflict	320/146	Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/MeasureTheory/Measure/EverywherePos.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Compactness/LocallyCompact.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/DenseEmbedding.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/IndicatorConstPointwise.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Partial.lean,Mathlib/Topology/PartialHomeomorph.lean,Mathlib/Topology/PartitionOfUnity.lean,Mathlib/Topology/QuasiSeparated.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/TietzeExtension.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Completion.lean,Mathlib/Topology/UniformSpace/Equicontinuity.lean,Mathlib/Topology/UniformSpace/Matrix.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UnitInterval.lean,Mathlib/Topology/UrysohnsBounded.lean,Mathlib/Topology/UrysohnsLemma.lean,Mathlib/Topology/VectorBundle/Basic.lean,lakefile.lean,scripts/run_linter.lean	49	0	[]	nobody	174-61498 5 months ago	174-61539 174 days ago	0-8 8 seconds
31796	dobronx1325 author:dobronx1325	feat(Data/Real/EReal): add mul_lt_mul_of_pos_left theorem	This PR adds the theorem `EReal.mul_lt_mul_of_pos_left`, which states that for a positive real number `a` and extended reals `b < c`, left multiplication by `a` preserves the strict order: `(a : EReal) * b < (a : EReal) * c`. The theorem complements existing order-preserving properties for addition in `EReal` and extends the algebraic structure for multiplication. The proof uses basic properties of extended reals and order relations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	23/0	Mathlib/Data/EReal/Operations.lean	1	4	['JovanGerb', 'LLaurance', 'dobronx1325', 'github-actions']	nobody	174-3377 5 months ago	174-59689 174 days ago	6-24874 6 days
29899	eric-wieser author:eric-wieser	chore: add `=Q` arguments to ring casting operations	This also detects an `isDefeq` which is unifying across universes and types, which I remember rumors about being sometimes a bad idea. I'm a little worried that the `=Q` design here runs into DTT hell, but it works in the one place that is "Qq-clean" right now, so I'd be inclined to apply it to help us learn more about the pattern in future. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	36/23	Mathlib/Tactic/Ring/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	174-2549 5 months ago	unknown	0-0 0 seconds
31920	thorimur author:thorimur	test: `env_linter` for unused decidable instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	128/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	5	19	['github-actions', 'leanprover-bot', 'leanprover-radar', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	173-85563 5 months ago	unknown	0-0 0 seconds
27258	JovanGerb author:JovanGerb	feat: Imo2020 q6	Original PR: #23431 This PR adds a solution to IMO 2020 Q6. It follows the solution that I found when I was participating in the IMO. I used the statement formalization that was given by @jsm28. --- - [x] depends on: #27257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO awaiting-author	335/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	14	['JovanGerb', 'dwrensha', 'github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	173-55055 5 months ago	173-55055 173 days ago	64-4663 64 days
26138	xroblot author:xroblot	Development branch (2)	---	WIP merge-conflict	331/70	Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean,Mathlib/Sandbox.lean	11	16	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	173-44031 5 months ago	333-74265 333 days ago	0-12 12 seconds
29357	eric-wieser author:eric-wieser	refactor: generalize IsSimpleRing to semirings	--- - [ ] depends on: #26277 - [ ] depends on: #22954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	26/9	Mathlib/Data/Setoid/Basic.lean,Mathlib/RingTheory/SimpleRing/Basic.lean,Mathlib/RingTheory/SimpleRing/Defs.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	173-43527 5 months ago	unknown	0-0 0 seconds
31729	thorimur author:thorimur	chore: log on theorem type signature in unused instances in type linters	Logs on the type signature in the unused instances in types linter, and tests this using `#guard_msgs (positions := true)`. --- - [ ] depends on: #31730 - [x] depends on: #31142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import	636/3	Mathlib.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/Lean/Environment.lean,Mathlib/Lean/Expr.lean,Mathlib/Lean/Expr/Basic.lean,Mathlib/Lean/Syntax.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean,Mathlib/Util/DeclarationManipulation.lean,MathlibTest/UnusedInstancesInType.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	173-28357 5 months ago	183-16539 183 days ago	0-697 11 minutes
32157	peabrainiac author:peabrainiac	feat(Analysis/Calculus): Hadamard's lemma	Add [Hadamard's lemma](https://en.wikipedia.org/wiki/Hadamard%27s_lemma) for functions from finite-dimensional normed spaces to Banach spaces. --- - [ ] depends on: #31141 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	314/5	Mathlib.lean,Mathlib/Analysis/Calculus/Hadamard.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	173-18892 5 months ago	173-18893 173 days ago	0-1385 23 minutes
26436	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib/Data/Nat/Prime/Defs): fuel Nat.minFac	This is a fueled version of docs#Nat.minFacAux that can now be checked by `decide`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data awaiting-author	53/48	Mathlib/Data/Nat/Prime/Defs.lean	1	3	['digama0', 'github-actions', 'leanprover-community-bot-assistant']	nobody	172-72743 5 months ago	326-57531 326 days ago	0-60 1 minute
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data merge-conflict	44/22	Mathlib/Data/Int/GCD.lean	1	6	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'nomeata', 'urkud']	nobody	172-63273 5 months ago	324-16751 324 days ago	58-34020 58 days
30375	sinhp author:sinhp	feat(CategoryTheory): Basics of Locally Cartesian Closed Categories	Supersedes https://github.com/leanprover-community/mathlib4/pull/22321 This PR defines locally cartesian closed categories in terms of existence of the pushforward functors (right adjoint to the pullback functor) for all morphisms. We develop basic API and prove the following: 1. Existence of the pushforward functors is equivalent to cartesian closed slices. 2. Any locally cartesian closed category with a terminal object is cartesian closed. 3. The slices of a locally cartesian closed category are locally cartesian closed. --- - [ ] depends on: #31033 - [ ] depends on: #30373 - [ ] depends on: #31332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP blocked-by-other-PR	1085/0	Mathlib.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullbacksAlong.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ExponentiableMorphism.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Sections.lean	5	9	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	172-25355 5 months ago	221-48335 221 days ago	0-2073 34 minutes
32169	saodimao20 author:saodimao20	feat: add convolution_comp_add_right	This PR adds a lemma `convolution_comp_translation_right` showing that convolution commutes with translation on the right operand. Specifically, it proves that for an additive commutative group $G$, the convolution of a function $f$ with a translated function $x \mapsto g(a + x)$ is equal to the convolution of $f$ and $g$ evaluated at $x + a$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor awaiting-author	14/0	Mathlib/Analysis/Convolution.lean	1	3	['github-actions', 'urkud']	nobody	171-76157 5 months ago	171-76157 171 days ago	0-82278 22 hours
28244	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformation): Icons	We define icons (short for Identity Component Oplax Natural transformations) between lax functors in bicategories. Such transformations bundle an oplax natural transformation, along with the assertion that the source and target functor agree on objects, and the fact that the app-component of the underlying natural transformation is the `eqToHom` morphism along that equality. We define vertical composition of such natural transformations. Strict associativity and strict unitality of the composition of icons will be the content of a follow-up PR. In future work, icons will constitute the 2-cells of a strict bicategory structure on bicategories, with 1-cells (strictly unitary) pseudofunctors. This bicategory structure will define a category structure on strictly unitary pseudofunctors from `LocallyDiscrete (Fin n)` to a bicategory `C` (i.e "pseudo-composable arrows" in `C`), which will be part of the definition of the 2-nerve of `C`, which is a simplicial category that encodes higher compositions within a bicategory `C`. --- - [ ] depends on: #25825 - [ ] depends on: #28243 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory awaiting-CI large-import merge-conflict	816/33	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Icon.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Strict.lean,Mathlib/CategoryTheory/EqToHom.lean,scripts/noshake.json	8	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	171-45691 5 months ago	280-47604 280 days ago	0-1160 19 minutes
29933	smmercuri author:smmercuri	chore: fix `def` naming isses in `Normed/Field/WithAbs.lean`	--- - [x] depends on: #29932 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	33/23	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	171-36816 5 months ago	235-45219 235 days ago	1-17350 1 day
31350	grunweg author:grunweg	feat: (unoriented) bordism groups	We define the unoriented bordism group of a topological space and prove that it is an abelian group: we don't prove transitivity of bordisms yet, as that requires the collar neighbourhood theorem and gluing of smooth manifolds, which are both not in mathlib and a sizable piece of work. --- This PR is not ready for review yet; I'm merely opening this to track this branch' state better. In particular, this PR depends on several preliminary PRs: - [ ] depends on: #15906 for defining singular manifolds - [ ] depends on: #23040: define immersions and smooth embeddings: in finite dimensions, these are easy to describe; for mathlib, we will want a correct definition for e.g. Banach manifolds also. - [ ] depends on: #28793 is the first step for this - [ ] depends on: #31351 defines manifolds with smooth boundary: the main dependence are smooth embeddings (and some basic results about these), then the definition needs redoing. - depends on: #22874 for some constructions - defining unoriented bordisms, and proving some basic constructions about them: will be another PR This PR continues the work from #23138.	merge-conflict WIP t-differential-geometry blocked-by-other-PR	1084/2	Mathlib.lean,Mathlib/Geometry/Manifold/Bordisms.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	171-29522 5 months ago	192-70187 192 days ago	0-77 1 minute
32126	nielsvoss author:nielsvoss	feat(Analysis/Normed/Operator): definition of singular values for linear maps	This PR defines a generalization of singular values, the approximation numbers, for continuous linear maps between normed vector spaces. It proves basic lemmas about the approximation numbers and shows that for finite-dimensional vector spaces, the approximation numbers coincide with the standard definition of singular values. See the discussion on Zulip: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Singular.20Value.20Decomposition/with/558914024 Co-authored-by: Arnav Mehta Co-authored-by: Rawad Kansoh --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor	331/0	Mathlib/Analysis/Normed/Operator/SingularValues.lean	1	2	['github-actions', 'nielsvoss']	nobody	171-27298 5 months ago	unknown	0-0 0 seconds
26389	jjdishere author:jjdishere	feat(RingTheory): Perfectoid Field	This PR continues the work from #19972. Original PR: https://github.com/leanprover-community/mathlib4/pull/19972	t-algebra WIP t-topology t-analysis label:t-algebra$	150/0	Mathlib/RingTheory/Perfectoid.lean	1	2	['github-actions', 'jjdishere']	nobody	170-71581 5 months ago	328-6096 328 days ago	0-69 1 minute
32285	awainverse author:awainverse	chore(ModelTheory/Bundled): Replace CategoryTheory.Bundled	Replaces the use of CategoryTheory.Bundled L.Structure with a bespoke type for bundled L.Structures, L.StrucType. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author merge-conflict	95/55	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Order.lean,Mathlib/ModelTheory/Satisfiability.lean	5	3	['github-actions', 'jcommelin', 'mathlib-merge-conflicts']	nobody	168-54985 5 months ago	168-54985 168 days ago	0-66385 18 hours
28895	yury-harmonic author:yury-harmonic	feat(NumberTheory): prove Zsigmondy's theorem	--- - [x] depends on: #28879 - [x] depends on: #28825 - [x] depends on: #28833 - [x] depends on: #28888 - [x] depends on: #28830 - [x] depends on: #28765 - [x] depends on: #28886 - [x] depends on: #28934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		1307/0	Mathlib.lean,Mathlib/NumberTheory/Zsigmondy.lean	2	8	['dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	167-43119 5 months ago	unknown	0-0 0 seconds
31950	callesonne author:callesonne	feat(CategoryTheory/Product/Basic): make `Hom` into a 1-field structure	This should help unification. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	80/68	Mathlib/CategoryTheory/Comma/Basic.lean,Mathlib/CategoryTheory/Discrete/SumsProducts.lean,Mathlib/CategoryTheory/Functor/Currying.lean,Mathlib/CategoryTheory/Functor/CurryingThree.lean,Mathlib/CategoryTheory/Functor/Hom.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/CategoryTheory/Limits/FormalCoproducts.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/Products/Associator.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/CategoryTheory/Products/Unitor.lean,Mathlib/CategoryTheory/Sums/Products.lean,Mathlib/CategoryTheory/Yoneda.lean	14	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	167-42254 5 months ago	177-47204 177 days ago	0-6 6 seconds
8224	Kha author:Kha	chore: add `lean4checker` benchmark		WIP merge-conflict	16/0	scripts/bench/temci-config.run.yml	1	4	['Kha', 'grunweg', 'kim-em', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	167-28528 5 months ago	924-61713 924 days ago	0-7460 2 hours
22416	JLimperg author:JLimperg	chore: fix benchmark script for precompilation	The benchmarking script used to fail when precompilation was enabled anywhere in the dependency graph. --- Fix courtesy of @Kha. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2/0	scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	167-27386 5 months ago	unknown	0-0 0 seconds
27579	RemyDegenne author:RemyDegenne	feat: risk of an estimator, DeGroot statistical information, total variation distance	This is an overview PR and will be cut into several pieces. It contains definitions and properties of: - the risk and Bayes risk of an estimator, in general and then specialized to binary hypothesis testing - the DeGroot statistical information between two measures, as well as a generalization for a kernel on more than two outcomes - the total variation distance between measures, defined as a special case of the DeGroot statistical information Co-authored-by: Lorenzo Luccioli @LorenzoLuccioli From the TestingLowerBounds project --- - [x] depends on: #27583 - [x] depends on: #27584 - [x] depends on: #27585 - [x] depends on: #27586 - [x] depends on: #27587 - [x] depends on: #27591 - [x] depends on: #28081 - [x] depends on: #28082 - [x] depends on: #28117 - [x] depends on: #28341 - [x] depends on: #29137 - [x] depends on: #29143 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import t-measure-probability	1713/1	Mathlib.lean,Mathlib/InformationTheory/TotalVariation/Basic.lean,Mathlib/Probability/Decision/AuxLemmas.lean,Mathlib/Probability/Decision/BayesEstimator.lean,Mathlib/Probability/Decision/Binary.lean,Mathlib/Probability/Decision/BoolMeasure.lean,Mathlib/Probability/Decision/DeGrootInfo.lean,Mathlib/Probability/Decision/Risk/Basic.lean,Mathlib/Probability/Decision/Risk/Countable.lean,Mathlib/Probability/Decision/RiskIncrease.lean,Mathlib/Probability/Decision/ZeroOneLoss.lean	11	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	166-56770 5 months ago	294-72570 294 days ago	0-1 1 second
30966	gasparattila author:gasparattila	refactor: disable `simp` in `measurability`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	5/3	Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Defs.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Typeclasses/SFinite.lean,Mathlib/Tactic/Measurability.lean	5	8	['github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	166-50000 5 months ago	unknown	0-0 0 seconds
29315	kbuzzard author:kbuzzard	chore: raise priority of `IsTopologicalSemiring.toIsModuleTopology`	Instances of the form `SMul A B -> SMul (F A) (F B)` can be problematic for several reasons, one of them being that if `A = B` is a ring and if `F A` is also ring then this can cause a diamond with `Algebra.id`. In mathlib we attempt to coerce typeclass inference away from such problems by raising the priority of `Algebra.id` to 1100; this hack (implemented in #13032) seems to work well, indeed it seems sensible to try this instance early because it should be quick to fail and is always the right idea when it doesn't (the change also made mathlib faster and made a proof better). By the same logic it seems safe to raise the priority of `IsTopologicalSemiring.toIsModuleTopology` by the same amount; in FLT there is a mathematically natural but mathlib-problematic instance `Algebra K L -> Algebra (𝔸 K) (𝔸 L)` and then another instance `Algebra K L -> IsModuleTopology (𝔸 K) (𝔸 L)` where `𝔸 K` is the adele ring of the number field `K`, and the change in this PR solves timeouts when `K = L`. Zulip: [#mathlib4 > product of modules over product of rings @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/product.20of.20modules.20over.20product.20of.20rings/near/532799613) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) There are other solutions to this problem -- I am certainly not claiming that the FLT project needs this PR to be merged! We can tinker with priorities locally in FLT for example. However when I noticed that `Algebra.id` had a raised priority in mathlib I realised that mathlib might be amenable to this further ~~hack~~change.	awaiting-author t-topology	6/1	Mathlib/Topology/Algebra/Module/ModuleTopology.lean	1	9	['github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-bot', 'ocfnash']	ocfnash assignee:ocfnash	165-53887 5 months ago	232-52251 232 days ago	25-3388 25 days
32474	mattrobball author:mattrobball	perf(Module.LinearMap.Defs): deprioritize projections to parents for SemilinearMapClass	Trying to figure out if a given type has a SemilinearMapClass instance when all we want is an AddHomClass or a MulActionSemiHomClass can be quite expensive since there are multiple ways to crawl the algebraic hierarchy to generate LinearMapClass instances. If these fail, then they fail slowly. We deprioritize the projections from SemilinearMapClass to AddHomClass and MulActionSemiHomClass to make this one of the last choices. --- This PR continues #23214 which was delegated by @j-loreaux but I let it slip. Will re-bench and see the effect. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	1	['github-actions']	nobody	164-52867 5 months ago	164-53267 164 days ago	164-53260 164 days
31898	ntapiam author:ntapiam	feat(LinearAlgebra/TensorAlgebra): implement HopfAlgebra for TensorAlgebra	implementation of the natural Hopf algebra structure on the TensorAlgebra	new-contributor t-ring-theory awaiting-author	253/0	Mathlib.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/RingTheory/Bialgebra/FreeAlgebra.lean,Mathlib/RingTheory/Bialgebra/TensorAlgebra.lean,Mathlib/RingTheory/HopfAlgebra/TensorAlgebra.lean	6	64	['YaelDillies', 'github-actions', 'kckennylau', 'ntapiam']	nobody	164-48134 5 months ago	177-14947 177 days ago	0-33607 9 hours
30525	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya): Add Polya Counting	This PR introduces basic definitions and results about colorings under permutation group actions. A coloring is defined as a function X → Y, and the permutation group Equiv.Perm X acts on colorings by precomposition: (g • c) x = c (g⁻¹ • x) This formalizes the natural action of relabeling the elements of X. Main definitions MulAction (Equiv.Perm X) (X → Y): The action of the permutation group on colorings via precomposition. coloringEquiv (c₁ c₂ : X → Y) : Prop: Two colorings are equivalent if they lie in the same orbit under this action, i.e. ∃ f : Equiv.Perm X, f • c₁ = c₂. Main results smul_eq_iff_mem_stabilizer: Characterizes when two group actions on the same coloring are equal, showing that g • c = f • c ↔ f⁻¹ * g ∈ stabilizer c. coloringEquiv_equivalence: Proves that coloringEquiv defines an equivalence relation on X → Y. orbit_size_eq_index: Reformulates the orbit–stabilizer theorem in the context of colorings: \|orbit c\| = \|Perm X\| / \|stabilizer c\| Motivation These results provide foundational infrastructure for studying Burnside’s lemma and Pólya’s enumeration theorem in Mathlib, where the enumeration of distinct colorings up to symmetry plays a central role.	t-combinatorics new-contributor awaiting-author merge-conflict	113/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	8	['IvanRenison', 'alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	164-34896 5 months ago	172-78439 172 days ago	39-43570 39 days
31113	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya.lean): Add additional theorem in `Polya.lean`	--- - [ ] depends on: #30525 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor blocked-by-other-PR merge-conflict	302/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	164-34772 5 months ago	173-57198 173 days ago	16-78251 16 days
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data new-contributor	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	38	['MrSumato', 'github-actions', 'grunweg', 'madvorak', 'mathlib4-merge-conflict-bot', 'plp127']	grunweg assignee:grunweg	164-30374 5 months ago	346-56718 346 days ago	29-59355 29 days
28057	plp127 author:plp127	feat(SuccOrder): simp lemma to refold `Order.succ` and `Order.pred`	Adds `SuccOrder.succ_eq_succ` and `PredOrder.pred_eq_pred` to refold `SuccOrder.succ` and `PredOrder.pred` into `Order.succ` and `Order.pred`. These lemmas are marked `@[simp]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-order merge-conflict	8/2	Mathlib/Order/SuccPred/Basic.lean	1	4	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	164-10002 5 months ago	241-25710 241 days ago	44-13238 44 days
31601	BoltonBailey author:BoltonBailey	feat(Data/Nat/Choose): A new strictly positive binomial coefficient	This is an experimental PR relating to replacing `Nat.choose` with a strictly positive function equivalently to `Nat.choose a (a + b)`. Currently this introduces a new function `Nat.binom`, but we could also modify `Nat.multinomial`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	226/1	Mathlib/Data/Nat/Choose/Binomial.lean,Mathlib/Data/Nat/Choose/Multinomial.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	163-74662 5 months ago	unknown	0-0 0 seconds
32473	mattrobball author:mattrobball	chore(Kaehler.JacobiZariski): remove egregious local instance hack	This code looks terrible and is no longer strictly necessary. Local timings give `lake build Mathlib/RingTheory/Kaehler/JacobiZariski.lean 39.77s user 1.07s system 263% cpu 15.482 total` after removal and `lake build Mathlib/RingTheory/Kaehler/JacobiZariski.lean 36.93s user 1.01s system 251% cpu 15.113 total` before the removal. So the preformance impact of removal is small. One could argue that keeping is a remainder that everything here needs to be seriously changed but the miminmal performance difference suggests that these local instances would be a red herring in that regard. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author merge-conflict	0/4	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	14	['chrisflav', 'erdOne', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'mattrobball']	nobody	163-53997 5 months ago	163-53997 163 days ago	1-301 1 day
27525	Hagb author:Hagb	(WIP) feat(Tactic/Linter/Indentation): add a linter for general indentation	--- todo: - [x] check whether some (direct or indirect) children of some kinds of parents are intended _strictly_ deeper than this parent. For example: ```lean example : Nat := Nat.add 1 -- should be strictly deeper than `Nat.add`? 2 ``` - [ ] check whether some (direct or indirect) children of some kinds of parents are intended exactly N spaces deeper than this parent. For example: ```lean example : True := trivial -- should be exact 2 spaces deeper than 0 space of `example` ``` - [ ] some special cases, such as `calc`. https://github.com/leanprover-community/mathlib4/blob/5ebccb65951c70539ba1c36e53e079ac28b3fd23/Mathlib/Geometry/Manifold/Riemannian/Basic.lean#L452-L454 - [ ] add test cases [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	1364/1	Mathlib/Init.lean,Mathlib/Tactic/Linter/Indentation.lean,Mathlib/Tactic/Linter/Indentation/Basic.lean,Mathlib/Tactic/Linter/Indentation/Defs.lean,Mathlib/Tactic/Linter/Indentation/Linters.lean,MathlibTest/IndentationLinter.lean,lakefile.lean	7	15	['Hagb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	163-9561 5 months ago	unknown	0-0 0 seconds
31147	daefigueroa author:daefigueroa	feat(Dynamics): point transitive monoid actions and transitive points	We define point transitivity for a monoid action on a topological space and define the set of transitive points. We add some basic lemmas and implications between topological transitivity and point transitivity. --- - [x] depends on: #28001 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor awaiting-author	114/6	Mathlib/Dynamics/Transitive.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	161-55607 5 months ago	161-55607 161 days ago	18-38983 18 days
30711	kim-em author:kim-em	experiment: which `omega` can not be replaced with `grind`?			1/0	lakefile.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	161-48680 5 months ago	unknown	0-0 0 seconds
30718	kim-em author:kim-em	experiment: merge rewrites		t-meta	1/0	lakefile.lean	1	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	161-48678 5 months ago	unknown	0-0 0 seconds
30720	kim-em author:kim-em	experiment: merge with subsequent grind			1/0	lakefile.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	161-48678 5 months ago	unknown	0-0 0 seconds
25871	eric-wieser author:eric-wieser	refactor: generalize rank lemmas to semirings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	18/8	Mathlib/LinearAlgebra/Dimension/Finite.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	161-3656 5 months ago	unknown	0-0 0 seconds
30119	Ruben-VandeVelde author:Ruben-VandeVelde	feat: WithTop/Bot.mapD	To replace Option.elim; working towards #27918 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-order merge-conflict	32/4	Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/WithBot.lean	2	5	['JovanGerb', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	160-82185 5 months ago	216-70277 216 days ago	12-3204 12 days
32328	ADedecker author:ADedecker	feat: template for distributions and their API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis merge-conflict	888/5	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean	4	4	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	160-25919 5 months ago	unknown	0-0 0 seconds
23040	grunweg author:grunweg	feat: define immersions and smooth embeddings in infinite dimensions	Sadly, we cannot prove most nice things about them yet, as we don't have the inverse function theorem yet. TODO: prove the few things we can already say --- - [ ] depends on: #28796 - [x] depends on: #28853 - [x] depends on: #23175 (preliminaries) - [x] depends on: #23186 - [ ] depends on: another PR, about `MSplitAt` (to be filed) - and perhaps some prerequisites about products of complemented modules etc. - [x] depends on: #23219 (preliminaries about local diffeomorphisms) - [x] depends on: #8738 - in fact, #9273 is not a strict pre-requisite for this. It suffices to know "extended charts have invertible differentials", which [isInvertible_mfderiv_extChartAt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/MFDeriv/Atlas.html#isInvertible_mfderiv_extChartAt) mostly proves. (There's nothing wrong with completing that PR, for all interior points.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	967/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	4	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	159-55764 5 months ago	unknown	0-0 0 seconds
30668	astrainfinita author:astrainfinita	feat: `QuotType`	This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotType` API for type synonyms of `Quot` and `Quotient` will avoid defeq abuse caused by directly using `Quot` and `Quotient` APIs. This PR also adds some typeclasses to support different ways to find the quotient map that should be used. See the documentation comments of these typeclasses for examples of usage. --- It's not a typical design to use these auxiliary typeclasses and term elaborators, but I haven't found a better way to support these notations. Some of the naming may need to be discussed. For example: - `⟦·⟧` is currently called `mkQ` in names. This distinguishes it from other `.mk`s and makes it possible to write the quotient map as `mkQ` `mkQ'` ~~`mkQ_ h`~~. But this will also require changing the old lemma names. - It would be helpful if the names of new type classes explained their functionality better. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/migrate.20to.20.60QuotLike.60.20API) This PR continues the work from #16421. Original PR: https://github.com/leanprover-community/mathlib4/pull/16421	RFC t-data awaiting-zulip awaiting-author	629/0	Mathlib.lean,Mathlib/Data/QuotType.lean,MathlibTest/QuotType.lean	3	22	['SnirBroshi', 'YaelDillies', 'astrainfinita', 'dagurtomas', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	159-29899 5 months ago	211-85152 211 days ago	0-81 1 minute
32706	CoolRmal author:CoolRmal	feat: a set is Gdelta iff it is completely metrizable	This PR proves that 1. A Gdelta subset of a completely metrizable space is completely metrizable. 2. We prove that under certain conditions we can always extends a continuous function on a set A to a Gdelta set. We then use this lemma to prove that if `A` is a completely metrizable subset in a metric space `M`, then `A` is Gdelta. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	29/0	Mathlib/Topology/Metrizable/CompletelyMetrizable.lean	1	1	['github-actions']	nobody	159-20643 5 months ago	unknown	0-0 0 seconds
30847	joelriou author:joelriou	feat(CategoryTheory/Presentable): the representation theorem	If `C` is an essentially `w`-small category, then the category of `κ`-continuous functors `Cᵒᵖ ⥤ Type w` is locally `κ`-presentable, and any locally `κ`-presentable category is equivalent to such a category. In particular, we show that a locally `κ`-presentable category has limits. This is a draft... --- - [ ] depends on: #32423 - [ ] depends on: #32424 - [ ] depends on: #32034 - [ ] depends on: #31137 - [ ] depends on: #30817 - [x] depends on: #30795 - [ ] depends on: #30755 - [ ] depends on: #30731 - [ ] depends on: #30554 - [ ] depends on: #30533 - [ ] depends on: #30513 - [x] depends on: #30509 - [x] depends on: #30507 - [x] depends on: #30492 - [x] depends on: #30464 - [x] depends on: #30459 - [x] depends on: #30269 - [ ] depends on: #30247 - [ ] depends on: #30241 - [x] depends on: #30168 - [x] depends on: #30160 - [x] depends on: #29881 - [x] depends on: #29854 - [x] depends on: #29565 - [x] depends on: #29543 - [x] depends on: #29519 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory merge-conflict	2137/27	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Generator/Type.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Types/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/IsSmall.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsCardinalClosure.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/Equivalence.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Limits.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Presheaf.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Adjunction.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/Continuous.lean,Mathlib/CategoryTheory/Presentable/Dense.lean,Mathlib/CategoryTheory/Presentable/EssentiallyLarge.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/OrthogonalReflection.lean,Mathlib/CategoryTheory/Presentable/Presheaf.lean,Mathlib/CategoryTheory/Presentable/Representation.lean,Mathlib/CategoryTheory/Presentable/StrongGenerator.lean,Mathlib/CategoryTheory/Presentable/Type.lean,Mathlib/CategoryTheory/Yoneda.lean	35	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	158-68839 5 months ago	206-71373 206 days ago	0-1 1 second
30817	joelriou author:joelriou	feat(CategoryTheory): `κ`-continuous presheaves	Given categories `C`, `D` and a regular cardinal `κ : Cardinal.{w}`, we define `isCardinalContinuous C D κ : ObjectProperty (C ⥤ D)` as the property of functors which preserves limits indexed by categories `J` such that `HasCardinalLT (Arrow J) κ`. When `C : Type w` is a small category, we show that `κ`-continuous functors `Cᵒᵖ ⥤ Type w` are exactly the objects that are local with respect to a suitable `w`-small family of morphisms. DRAFT --- - [ ] depends on: #32725 - [x] depends on: #32423 - [x] depends on: #32424 - [x] depends on: #30168 - [x] depends on: #30160 - [x] depends on: #29881 - [x] depends on: #29854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR merge-conflict	292/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/IsSmall.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Presheaf.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/Presentable/Continuous.lean	7	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	158-61137 5 months ago	207-73800 207 days ago	0-1 1 second
6633	adomani author:adomani	feat(..Polynomial..): `MvPolynomial`s have no zero divisors	This PR continues #6627, placing the `NoZeroDivisors` instance on `MvPolynomial`s and removing auxiliary intermediate results that are no longer needed. Affected files: ``` Data/MvPolynomial/Basic.lean Data/Polynomial/RingDivision.lean RingTheory/Polynomial/Basic.lean ``` --- - [x] depends on: #6227 for the `NoZeroDivisors` instance on `AddMonoidAlgebra`s [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	143/57	Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/RingTheory/Polynomial/Basic.lean	4	6	['SnirBroshi', 'YaelDillies', 'adomani', 'eric-wieser']	nobody	158-49534 5 months ago	1005-33876 1005 days ago	0-19485 5 hours
28865	grunweg author:grunweg	feat: a map is smooth iff its post-composition with an immersion is	The continuous case is mostly solved --- except for one detail where I'm not even sure if this is true. Maybe!, I need to require continuity, at least in general. (Perhaps not for interior points... we'll see!) A future PR will use this to golf the results in `Icc/Instances.lean`. --- - [x] depends on: #28793 - [ ] depends on: #28796 - [x] depends on: #28853 (for simplicity) - [ ] depends on: #28905 history bifurcates here: merge that PR first, then rebase this one [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	1026/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	12	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac']	nobody	158-16624 5 months ago	267-42070 267 days ago	0-11 11 seconds
26950	alreadydone author:alreadydone	Primitives of holomorphic functions and path integral	--- - [ ] depends on: #31925 - [x] depends on: #24983 - [x] depends on: #22771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict t-topology t-analysis blocked-by-other-PR	1288/361	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/Analysis/Complex/Primitive.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	21	3	['alreadydone', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	157-65315 5 months ago	unknown	0-0 0 seconds
32827	erdOne author:erdOne	perf: `@[simp high]` on `*Hom.map_add` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	4	['WenrongZou', 'erdOne', 'github-actions', 'leanprover-radar']	nobody	157-4212 5 months ago	unknown	0-0 0 seconds
31987	saodimao20 author:saodimao20	feat: add monotonicity and relation lemmas for mgf and cgf	Add two lemmas about moment-generating and cumulant-generating functions: - `mgf_mono_in_t_of_nonneg`: For nonnegative random variables, the mgf is monotone in the parameter `t` - `cgf_zero_of_mgf_one`: The cgf equals zero iff the mgf equals one These lemmas are useful for studying properties of mgf and cgf in probability theory. Contributed by sequential-intelligence-lab(SIL), University of Virginia --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor awaiting-author	21/0	Mathlib/Probability/Moments/Basic.lean	1	5	['DavidLedvinka', 'github-actions']	RemyDegenne assignee:RemyDegenne	155-47713 5 months ago	155-47713 155 days ago	21-31799 21 days
32211	ADedecker author:ADedecker	feat: inclusion from `ContDiffMapSupportedIn` to `TestFunction` is a topological embedding	--- - [ ] depends on: #32210 - [x] depends on: #31806 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR merge-conflict	136/2	Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	2	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	154-29640 5 months ago	171-49480 171 days ago	0-2371 39 minutes
32602	adamtopaz author:adamtopaz	feat: Refactor graph	Work in progress --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	1312/0	RefactorGraph/DAG.lean,RefactorGraph/Main.lean,RefactorGraph/Test.lean,lakefile.lean	4	1	['github-actions']	nobody	154-23761 5 months ago	161-32954 161 days ago	0-1 1 second
26912	pechersky author:pechersky	chore(Algebra/Ring/Subring): simp tag `Subring.smul_def`	s-multiplying by a subtype is easiest to manipulate when both terms are in the ambient type. Many places that had to use the _def lemma for a rewrite, or to include it in a simp set, no longer have to. Ported from #25308 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I found this being not-simp frustrating when talking about submodules over a valuation subring.	merge-conflict t-algebra label:t-algebra$	67/66	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean,Mathlib/RingTheory/OreLocalization/Basic.lean	25	26	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'leanprover-bot', 'leanprover-radar', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	154-20638 5 months ago	175-56587 175 days ago	63-23787 63 days
32737	j-loreaux author:j-loreaux	refactor: rename `MulAction` to `MonoidAction`	Given that we now have [SemigroupAction](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Group/Action/Defs.html#SemigroupAction) we are in the unfortunate scenario that the name which seems to have less structure actually has more structure. This PR: 1. renames `MulAction` to `MonoidAction` to reflect this additional structure, as well as declarations referencing `MulAction` in their names. `Prop`-valued mixins in the `MulAction` namespace are also renamed (e.g., `MulAction.{IsMinimal,IsTopologicallyTransitive}` → `MonoidAction.{IsMinimal,IsTopologicallyTransitive`). 2. The additive version are also renamed (`AddAction` → `AddMonoidAction`) and the corresponding `Prop`-valued mixins. 3. does not rename modules with `MulAction` in the name 4. does not rename `DistribMulAction`, `SubMulAction`, `MulActionWithZero`, etc. If these need to happen, that can occur at a later time. 5. does not rename `SemigroupAction` to `MulAction`. Even if this rename is desired, because of the prevalence of `MulAction` in Mathlib, I think we should not conduct a move of this magnitude all at once. If we want to rename this to `MulAction`, we should wait for the 6 month embargo period during which time that name is deprecated, to give everyone downstream the opportunity to switch instead of silently breaking their builds. Of course, another potential name is `MulOneAction`, but I don't think that's too helpful. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3623/1862	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Pi.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Field/Action/ConjAct.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/GradedMulAction.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Equidecomp.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Action/Opposite.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Pi.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Nat/Range.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Density.lean,Mathlib/Algebra/Group/Pointwise/Finset/Scalar.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Card.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Pointwise/Set/Lattice.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Shrink.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/GroupWithZero/Action/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/ConjAct.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Action/Faithful.lean,Mathlib/Algebra/GroupWithZero/Action/Opposite.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Set.lean,Mathlib/Algebra/GroupWithZero/Action/Prod.lean,Mathlib/Algebra/GroupWithZero/Action/TransferInstance.lean,Mathlib/Algebra/GroupWithZero/Action/Units.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/GroupWithZero/Pointwise/Finset.lean,Mathlib/Algebra/GroupWithZero/Pointwise/Set/Basic.lean,Mathlib/Algebra/GroupWithZero/Pointwise/Set/Card.lean,Mathlib/Algebra/GroupWithZero/Subgroup.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Pointwise.lean,Mathlib/Algebra/GroupWithZero/TransferInstance.lean,Mathlib/Algebra/GroupWithZero/Units/Lemmas.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/PUnit.lean,Mathlib/Algebra/Module/PointwisePi.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Invariant.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/ULift.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/Action/End.lean	349	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	153-68400 5 months ago	154-73315 154 days ago	2-52776 2 days
32717	adomani author:adomani	perf: small speed up of the flexible linter	This just rearranges an array accumulation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	7/8	Mathlib/Tactic/Linter/FlexibleLinter.lean	1	4	['adomani', 'github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot']	nobody	153-863 5 months ago	unknown	0-0 0 seconds
25141	eric-wieser author:eric-wieser	feat: basis for multilinear maps	This attempts to tease an intermediate result out of #11155, which lets us show that multilinear maps are free even if their codomain is not finite. I guess this continues from https://github.com/leanprover-community/mathlib3/pull/10504 and https://github.com/leanprover-community/mathlib3/pull/14199. --- - [ ] depends on: #11155 - [ ] depends on: #25142 - [ ] depends on: #25169 - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	507/45	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean,Mathlib/LinearAlgebra/Multilinear/FiniteDimensional.lean,Mathlib/LinearAlgebra/Multilinear/Pi.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	152-61763 5 months ago	unknown	0-0 0 seconds
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	Use the free-forgetful adjunction to show that `Grpd` has all limits in `CategoryTheory.Category.Grpd.Limit`, as a reflective subcategory of `Cat`. - [ ] depends on: #29250[Renamings in Grpd file] - [ ] depends on: #29278[Quotient of a groupoid is a groupoid] - [ ] depends on: #29279[Free forgetful adjunction] - [ ] depends on: #29283 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed blocked-by-other-PR t-category-theory merge-conflict	243/65	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoidOfCategory.lean,Mathlib/CategoryTheory/Groupoid/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Free.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	9	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	152-32775 5 months ago	184-52678 184 days ago	0-8803 2 hours
29283	Jlh18 author:Jlh18	feat(CategoryTheory): define forgetful-core adjunction between Cat and Grpd	* Define `CategoryTheory.Core.functor`: the functor `Cat ⥤ Grpd` that on objects takes the core of a category * Define `CategoryTheory.Core.adjunction`: the adjunction with the forgetful functor `Grpd.forgetToCat` on the left, and the core functor `Core.functor` on the right. * Hence provide an instance that `Grpd.forgetToCat` is coreflective. --- - [x] depends on: #29284 [Extra lemmas in CategoryTheory.Core] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory awaiting-author merge-conflict	209/64	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoidOfCategory.lean,Mathlib/CategoryTheory/Groupoid/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Free.lean	7	25	['Jlh18', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	152-32774 5 months ago	159-31401 159 days ago	13-74712 13 days
33015	thorimur author:thorimur	share: stress test plugins via pluginizing Mathlib.Init	This PR is only created for conveniently sharing this branch via `gh` for the purpose of experimenting with plugins. There's no plan to make Mathlib.Init a plugin any time soon. :) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	999/1080	Mathlib.lean,Mathlib/Algebra/Expr.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/CategoryTheory/Category/Init.lean,Mathlib/CategoryTheory/ConcreteCategory/Bundled.lean,Mathlib/Combinatorics/Matroid/Init.lean,Mathlib/Combinatorics/SimpleGraph/Init.lean,Mathlib/Control/Combinators.lean,Mathlib/Control/ULift.lean,Mathlib/Data/Array/Defs.lean,Mathlib/Data/Array/Extract.lean,Mathlib/Data/Finset/Attr.lean,Mathlib/Data/Int/DivMod.lean,Mathlib/Data/Int/Notation.lean,Mathlib/Data/List/Monad.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Nat/Notation.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/String/Defs.lean,Mathlib/Data/Sym/Sym2/Init.lean,Mathlib/Data/UInt.lean,Mathlib/Deprecated/Aliases.lean,Mathlib/Deprecated/Sort.lean,Mathlib/Lean/ContextInfo.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/Lean/Elab/Tactic/Meta.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Lean/EnvExtension.lean,Mathlib/Lean/Environment.lean,Mathlib/Lean/Exception.lean,Mathlib/Lean/Expr/Basic.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/Lean/GoalsLocation.lean,Mathlib/Lean/Json.lean,Mathlib/Lean/LinterCopies.lean,Mathlib/Lean/LinterCopiesTest.lean,Mathlib/Lean/LocalContext.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Lean/Meta/DiscrTree.lean,Mathlib/Lean/Meta/KAbstractPositions.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/Simp.lean,Mathlib/Lean/Meta/Tactic/Rewrite.lean,Mathlib/Lean/Name.lean,Mathlib/Lean/PrettyPrinter/Delaborator.lean,Mathlib/Lean/Thunk.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/OpClass.lean,Mathlib/Tactic.lean,Mathlib/Tactic/AdaptationNote.lean,Mathlib/Tactic/ApplyCongr.lean,Mathlib/Tactic/ApplyWith.lean,Mathlib/Tactic/ArithMult/Init.lean,Mathlib/Tactic/Attr/Register.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/Bound/Init.lean,Mathlib/Tactic/CC/Lemmas.lean,Mathlib/Tactic/Cases.lean,Mathlib/Tactic/CasesM.lean,Mathlib/Tactic/CategoryTheory/CategoryStar.lean,Mathlib/Tactic/CategoryTheory/Coherence/Datatypes.lean,Mathlib/Tactic/Change.lean,Mathlib/Tactic/Check.lean,Mathlib/Tactic/Clean.lean,Mathlib/Tactic/ClearExcept.lean,Mathlib/Tactic/ClearExclamation.lean,Mathlib/Tactic/Clear_.lean,Mathlib/Tactic/Coe.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Constructor.lean,Mathlib/Tactic/Continuity/Init.lean,Mathlib/Tactic/Conv.lean,Mathlib/Tactic/Core.lean,Mathlib/Tactic/DepRewrite.lean,Mathlib/Tactic/Eqns.lean,Mathlib/Tactic/ErwQuestion.lean,Mathlib/Tactic/Eval.lean,Mathlib/Tactic/ExistsI.lean,Mathlib/Tactic/Explode/Datatypes.lean,Mathlib/Tactic/ExtendDoc.lean,Mathlib/Tactic/FailIfNoProgress.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Tactic/FieldSimp/Attr.lean,Mathlib/Tactic/Find.lean,Mathlib/Tactic/FindSyntax.lean,Mathlib/Tactic/Finiteness/Attr.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Mor.lean,Mathlib/Tactic/FunProp/ToBatteries.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,Mathlib/Tactic/Generalize.lean,Mathlib/Tactic/GuardGoalNums.lean,Mathlib/Tactic/GuardHypNums.lean,Mathlib/Tactic/Have.lean,Mathlib/Tactic/HaveI.lean	211	0	[]	nobody	152-27628 5 months ago	unknown	0-0 0 seconds
21447	erdOne author:erdOne	feat(AlgebraicGeometry): the split algebraic torus	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	419/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Torus.lean	2	6	['erdOne', 'github-actions', 'jcommelin', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	151-73699 5 months ago	465-25869 465 days ago	2-69252 2 days
32938	0xTerencePrime author:0xTerencePrime	feat(Order/LocallyFinite): prove DenselyOrdered and LocallyFiniteOrder are incompatible	## Summary This PR proves that a nontrivial densely ordered linear order cannot be locally finite. ## Main results * `not_locallyFiniteOrder`: A densely ordered locally finite linear order must be subsingleton. * `not_locallyFiniteOrder_of_nontrivial`: The main theorem - incompatibility of the two properties. Note: This implementation imports `Mathlib.Order.Interval.Set.Infinite` to reuse the existing `Set.Icc_infinite` theorem, ensuring standard library consistency. ## Mathematical content The key insight is that in a densely ordered type, we can always find a new element between any two distinct elements. This means any nontrivial interval contains infinitely many elements. However, `LocallyFiniteOrder` requires intervals to be finite. This contradiction implies that such a type cannot exist (unless it is trivial). ## Motivation This resolves a TODO mentioned in #7987 (Data/Finset/LocallyFinite entry). ## Verification - [x] `lake build Mathlib.Order.LocallyFinite.Basic` passes - [x] `lake exe runLinter Mathlib.Order.LocallyFinite.Basic` passes	t-order new-contributor awaiting-author	28/0	Mathlib/Order/Interval/Finset/Basic.lean	1	10	['0xTerencePrime', 'CoolRmal', 'github-actions', 'jcommelin', 'plp127']	nobody	150-71115 4 months ago	150-71155 150 days ago	3-22290 3 days
33077	YaelDillies author:YaelDillies	feat(Data/Rel): balls	Define `SetRel.ball` and use it in place of `UniformSpace.ball`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-data	38/3	Mathlib/Data/Rel.lean,Mathlib/Topology/UniformSpace/Defs.lean	2	1	['github-actions']	nobody	150-63100 4 months ago	150-63157 150 days ago	0-9 9 seconds
31226	erdOne author:erdOne	chore(RingTheory): add `@[ext]` to `Ideal.Quotient.algHom_ext`	See [`Ideal.Quotient.ringHom_ext`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=Ideal.Quotient.ringHom_ext#doc) which also has @[ext 1100]. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory easy merge-conflict	3/2	Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	7	['erdOne', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	150-52777 4 months ago	193-38478 193 days ago	3-12761 3 days
21495	alreadydone author:alreadydone	experiment: reducible HasQuotient.quotient'	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	2/0	Mathlib/Algebra/Quotient.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	150-38096 4 months ago	466-60926 466 days ago	0-200 3 minutes
32698	farruhx author:farruhx	feat(List): add aesop / simp annotations to selected lemmas for improved automation	This PR adds `@[aesop safe]` and `@[simp]` annotations to a set of List lemmas whose proofs are routine and benefit from standardized automation. No statements or definitions are changed; only proof annotations are added. The lemmas updated in this PR are: * `or_exists_of_exists_mem_cons` * `append_subset_of_subset_of_subset` * `map_subset_iff` * `append_eq_has_append` * `append_right_injective` * `append_left_injective` * `reverse_surjective` * `reverse_bijective` * `mem_getLast?_append_of_mem_getLast?` * `mem_dropLast_of_mem_of_ne_getLast` * `idxOf_eq_length_iff` * `idxOf_append_of_mem` * `length_eraseP_add_one` The goal is to make these commonly used lemmas easier for `aesop`-based automation to resolve, while avoiding any interference with simp-normal-form lemmas or canonical rewrite rules. There are no API changes and no new theorems—only improved automation behavior.	t-data new-contributor awaiting-author	18/1	Mathlib/Data/List/Basic.lean	1	8	['artie2000', 'euprunin', 'farruhx', 'github-actions']	pechersky assignee:pechersky	150-19484 4 months ago	150-19484 150 days ago	7-31364 7 days
29203	Hagb author:Hagb	feat(RingTheory/MvPolynomial/Groebner): add Gröbner basis	This PR adds some definitions and theorems of Gröbner basis theory. Definitions: - `MonomialOrder.IsRemainder` - `MonomialOrder.IsGroebnerBasis` Main theorems: * `MonomialOrder.remainder_eq_zero_iff_mem_ideal_of_isGroebnerBasis`: Given a remainder of a polynomial on division by a Gröbner basis of an ideal, the remainder is 0 if and only if the polynomial is in the ideal. * `MonomialOrder.isGroebnerBasis_iff_subset_ideal_and_isRemainder_zero`: A finite set of polynomials is a Gröbner basis of an ideal if and only if it is a subset of this ideal and 0 is a remainder of each member of this ideal on division by this finite set. * `MonomialOrder.existsUnique_isRemainder_of_isGroebnerBasis`: Remainder of any polynomial on division by a Gröbner basis exists and is unique. * `MonomialOrder.ideal_eq_span_of_isGroebnerBasis`: Gröbner basis of any ideal spans the ideal. * `MonomialOrder.isGroebnerBasis_iff_isRemainder_sPolynomial_zero` (Buchberger Criterion): a basis of an ideal is a Gröbner basis of it if and only if 0 is a remainder of echo sPolynomial between two polynomials on the basis. The previous `Mathlib/RingTheory/MvPolynomial/Groebner.lean` is moved to `Mathlib/RingTheory/MvPolynomial/Groebner/Division.lean`, and used by `Mathlib/RingTheory/MvPolynomial/Groebner/Remainder.lean` for the proof of remainder's existence. The PR is upstreamized from https://github.com/WuProver/groebner_proj. Co-authored-by: Hao Shen [3118181069@qq.com](mailto:3118181069@qq.com) --- CC @tsuki8 TODO / WIP: - [x] clean up some proofs - [x] split lemmas - [x] squeeze Non-terminal `simp`s - [x] add comments to explain the proof of Buchberger Criterion. - [x] refactor something with `WithBot (σ →₀ ℕ)` variant of `MonomialOrder.degree` (`MonomialOrder.withBotDegree`, #34759). - [x] refactor to use namespaces `MonomialOrder.{IsGroebnerBasis,IsRemainder}` instead of `_of_{isGroebnerBasis,isRemainder}` in theorem names. - [ ] reduced Groebner Basis (done, not yet submitted) - [x] refactor to avoid too many `IsUnit` or `nonZeroDivisors` - [x] split `IsRemainder` and `IsGroebnerBasis` - [ ] embedding of monomial order (done, not yet submitted), and properties about it and Groebner basis. - [ ] some theorems can be generalized to avoid requiring `IsUnit` Dependencies: - [x] depends on: #26039 - [ ] depends on: #34759 S-polynomial and other lemmas in other files are split from this PR, leaving only changes of `Mathlib/RingTheory/MvPolynomial/Groebner{.lean,/.lean}` in this PR. The following are PRs split from this PR. - [x] depends on: #32336 - [x] depends on: #32344 - [x] depends on: #32780 - [x] depends on: #32787 - [x] depends on: #32788 - [x] depends on: #32801 - [x] depends on: #32876 - [x] depends on: #32877 - [ ] depends on: #34873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR WIP merge-conflict awaiting-author	1649/220	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Logic/Basic.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/Groebner/Division.lean,Mathlib/RingTheory/MvPolynomial/Groebner/Groebner.lean,Mathlib/RingTheory/MvPolynomial/Groebner/Remainder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,docs/references.bib	5	21	['Hagb', 'SnirBroshi', 'erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	alreadydone and erdOne assignee:alreadydone assignee:erdOne	150-9734 4 months ago	150-9784 150 days ago	3-68616 3 days
27817	zhuyizheng author:zhuyizheng	feat: add IMO2025P1	Add a solution to IMO2025P1, the original problem statement from https://github.com/jsm28/IMOLean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO awaiting-author new-contributor merge-conflict	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	9	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'zhuyizheng']	dwrensha assignee:dwrensha	149-51681 4 months ago	209-16249 209 days ago	59-36769 59 days
33157	wwylele author:wwylele	feat(Combinatorics): partitions and pentagonal numbers	--- - [ ] depends on: #33143 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	506/1	Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Enumerative/Partition/Pentagonal.lean,Mathlib/RingTheory/PowerSeries/Pentagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Pentagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,docs/1000.yaml	8	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	148-51171 4 months ago	unknown	0-0 0 seconds
32497	themathqueen author:themathqueen	chore: make `FiniteDimensional.complete 𝕜` an instance when `𝕜` is `RCLike`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-bench	3/26	Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean	2	3	['github-actions', 'leanprover-radar', 'themathqueen']	nobody	147-9681 4 months ago	unknown	0-0 0 seconds
33218	Blackfeather007 author:Blackfeather007	feat(Algebra): Define the associated graded ring to filtered ring	Define the associated graded ring to a filtered ring. --- - [ ] depends on: #33217 migrated from https://github.com/leanprover-community/mathlib4/pull/26858	t-ring-theory new-contributor blocked-by-other-PR	450/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84346 4 months ago	147-3231 147 days ago	0-132 2 minutes
33219	Blackfeather007 author:Blackfeather007	feat(Algebra): Define associated graded algebra	Define the associated graded algebra of a filtered algebra, constructed from a special case of associated graded ring. --- - [ ] depends on: #33218 migrated from #26859	t-ring-theory new-contributor blocked-by-other-PR	563/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84238 4 months ago	147-3005 147 days ago	0-133 2 minutes
33220	Blackfeather007 author:Blackfeather007	feat(Algebra): Define associated graded module	Define the associated graded module to a filtered module. --- - [ ] depends on: #33218 migrated from #26860	t-ring-theory new-contributor blocked-by-other-PR	669/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-84154 4 months ago	147-2817 147 days ago	0-137 2 minutes
33227	Blackfeather007 author:Blackfeather007	feat(Algebra): exact of associated graded exact	We proved that a chain complex is exact if its associated graded complex is exact. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33226 migrated from #26869	t-ring-theory new-contributor blocked-by-other-PR	728/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81826 4 months ago	146-81827 146 days ago	0-1208 20 minutes
33226	Blackfeather007 author:Blackfeather007	feat(Algebra): associated graded exact of exact and strict	In this file, we define the concept of exhaustive filtrations. We also prove a AssociatedGradedRingHom sequence is exact iff each GradedPieceHom is exact. And when a sequence is strict exact, the corresponding AssociatedGradedRingHom sequence is also exact. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33222 migrated from #26868	t-ring-theory new-contributor blocked-by-other-PR	529/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81824 4 months ago	146-81825 146 days ago	0-1307 21 minutes
33225	Blackfeather007 author:Blackfeather007	feat(Algebra): filtered module hom	In this PR we defined the filtered semi-linear map for filtered module and the associated graded module hom. --- - [ ] depends on: #33220 - [ ] depends on: #33223 migrated from #26867	t-ring-theory new-contributor blocked-by-other-PR	1205/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81823 4 months ago	146-81824 146 days ago	0-1805 30 minutes
33224	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered alghom	In this PR, we define the filtered algebra homomorphisms on algebras and prove some basic properties of them. --- - [ ] depends on: #33219 - [ ] depends on: #33223 migrated from #26863	t-ring-theory new-contributor blocked-by-other-PR	1055/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81821 4 months ago	146-81822 146 days ago	0-2046 34 minutes
33223	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered ring homomorphism	In this PR, we define the filtered ring morphisms on rings and prove some basic properties of them. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33218 - [ ] depends on: #33222 migrated from #26862	t-ring-theory new-contributor blocked-by-other-PR	824/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81818 4 months ago	146-81821 146 days ago	0-2257 37 minutes
33222	Blackfeather007 author:Blackfeather007	feat(Algebra): define filtered add group hom	In this file we define filtered hom and the corresponding associated graded hom for abelian groups. Co-authored-by: Huanyu Zheng @Yu-Misaka [suzuka@misaka-yu.com](mailto:suzuka@misaka-yu.com) Co-authored-by: Yi Yuan @yuanyi-350 [kysyy1@126.com](mailto:kysyy1@126.com) Co-authored-by: Weichen Jiao @AlbertJ-314 [albertjiao314@gmail.com](mailto:albertjiao314@gmail.com) --- - [ ] depends on: #33217 migrated from #26861	new-contributor t-ring-theory blocked-by-other-PR	368/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-81817 4 months ago	146-81818 146 days ago	0-2249 37 minutes
33134	faenuccio author:faenuccio	feat(Normed/Module/WeakDual): add Goldstine lemma	We add Goldstine lemma stating that the weak-closure of the image in the double dual of the unit ball coincides with the unit ball. As a corollary we derive that the image of `inclusionInDoubleDual` is weak-dense. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict	148/3	Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/references.bib	3	3	['github-actions', 'mathlib-merge-conflicts']	nobody	146-36205 4 months ago	149-35433 149 days ago	0-16 16 seconds
33269	urkud author:urkud	feat(MeasureTheory/Covering): generalize some lemmas to outer measures	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	29/19	Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean	2	1	['github-actions']	nobody	144-83729 4 months ago	144-83770 144 days ago	0-30 30 seconds
33138	gasparattila author:gasparattila	chore(MeasureTheory/Measure/Stieltjes): remove `backward.privateInPublic`	In #32482, some definitions in this file were rewritten using private declarations. However, this made `StieltjesFunction.length` unusable, since its API uses private declarations even in statements. This PR fixes this by problem by specializing `length_eq` to `NoMinOrder` and adding a new lemma for the `OrderBot` case. The other lemmas involving the private declarations are made private, except for `length_subadditive_Icc_Ioo`, which is reverted to the previous statement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability tech debt awaiting-author	35/30	Mathlib/MeasureTheory/Measure/Stieltjes.lean	1	6	['github-actions', 'grunweg', 'sgouezel', 'vihdzp']	sgouezel assignee:sgouezel	144-24658 4 months ago	144-24658 144 days ago	5-1594 5 days
33307	grunweg author:grunweg	Orientable manifolds updated	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry	377/4	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	2	['github-actions']	nobody	143-55570 4 months ago	unknown	0-0 0 seconds
5934	eric-wieser author:eric-wieser	feat: port Data.Rat.MetaDefs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This needs some eyes from people familiar with Qq	merge-conflict help-wanted mathlib-port t-meta	183/0	Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean	3	5	['eric-wieser', 'gebner', 'vihdzp']	nobody	143-35515 4 months ago	unknown	0-0 0 seconds
4960	eric-wieser author:eric-wieser	chore: use `open scoped`	Earlier versions of mathport did not know about this. This was done by searching for all `open` commands referencing: * `Classical` * `BigOperators` * `Topology` * `Pointwise` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI	1026/981	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Order.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/Category/GroupCat/Biproducts.lean,Mathlib/Algebra/Category/GroupCat/FilteredColimits.lean,Mathlib/Algebra/Category/GroupCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/Mon/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Div.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/PointwisePi.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/SMul.lean,Mathlib/Algebra/Order/UpperLower.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/GroupRingAction.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Support.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Maximal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/ContDiffDef.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean	788	1	['vihdzp']	nobody	143-35412 4 months ago	1073-20142 1073 days ago	0-753 12 minutes
4127	kmill author:kmill	refactor: create HasAdj class, define Digraph, and generalize some SimpleGraph API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics	1403/551	Mathlib.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Graph/Classes.lean,Mathlib/Combinatorics/Graph/Dart.lean,Mathlib/Combinatorics/Graph/Hom.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Finsubgraph.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	18	2	['SnirBroshi', 'vihdzp']	nobody	143-31387 4 months ago	1086-51228 1086 days ago	8-43930 8 days
32264	jjtowery author:jjtowery	feat(Bicategory): add lax slice bicategory	--- In this PR, I define the lax slice bicategory for a lax functor over an object. I also give the change of slice strict pseudofunctor. These are from Section 7.1 of Johnson & Yau and are essential for their Whitehead theorem for bicategories (lax functor biequivalence iff essentially surjective, essentially full, and fully faithful), which I'd like to prove at some point. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	527/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LaxSlice.lean	2	12	['dagurtomas', 'github-actions', 'jjtowery', 'robin-carlier']	dagurtomas assignee:dagurtomas	143-23903 4 months ago	166-27360 166 days ago	3-47959 3 days
27752	plp127 author:plp127	feat(Order): `NoBotOrder α` implies `NoMinOrder α` under `IsDirected α (· ≥ ·)`	This PR continues the work from #24266. Original PR: https://github.com/leanprover-community/mathlib4/pull/24266	awaiting-author t-order merge-conflict	14/0	Mathlib/Order/Directed.lean	1	5	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	143-15120 4 months ago	291-48745 291 days ago	0-2869 47 minutes
32921	faenuccio author:faenuccio	refactor Submodule.map	Following [#mathlib4 > on the definition of Submodule.map](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/on.20the.20definition.20of.20Submodule.2Emap/with/563900347) this PR refactors the definition of `Submodule.map` removing the requirement that the underlying ring homomorphism be surjective. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-author t-algebra merge-conflict label:t-algebra$	32/20	Mathlib/Algebra/Module/Submodule/Map.lean	1	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	142-59483 4 months ago	154-34773 154 days ago	0-1 1 second
32889	artie2000 author:artie2000	feat(Algebra): forgetful lemmas for `map` and `comap` on substructures	* Standardise the form of forgetful lemmas for `map` and `comap` (ie, `(co)map_toSubfoo`) * Add missing lemmas of this form * Mark all such lemmas as `simp` --- - [x] depends on: #21031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict blocked-by-other-PR label:t-algebra$	72/17	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/Subalgebra.lean	6	30	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	142-53011 4 months ago	152-27558 152 days ago	2-56660 2 days
32960	dleijnse author:dleijnse	feat(FieldTheory): adjoin pth roots	For a field `k` of exponential characteristic `p` and a subset `S` of `k`, we define the extension of `k` obtained by adjoining all `p`-th roots of elements of `S`. We prove that this is a purely inseparable extension, and provide some basic API. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	131/0	Mathlib.lean,Mathlib/FieldTheory/PurelyInseparable/AdjoinPthRoots.lean	2	13	['artie2000', 'chrisflav', 'dleijnse', 'erdOne', 'github-actions', 'leanprover-radar']	erdOne assignee:erdOne	142-40555 4 months ago	142-40555 142 days ago	10-12739 10 days
33163	Aaron1011 author:Aaron1011	feat: prove subgroup of (M -> Z) is finitely generated	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	5/0	Mathlib/RingTheory/DedekindDomain/Dvr.lean	1	2	['erdOne', 'github-actions']	alreadydone assignee:alreadydone	142-33505 4 months ago	142-33505 142 days ago	5-81520 5 days
25481	kbuzzard author:kbuzzard	chore: refactor Algebra.TensorProduct.rightAlgebra	The declaration `Algebra.TensorProduct.rightAlgebra` makes `A ⊗[R] B` into a `B`-algebra (here `R` is a `CommSemiring`, `A` is a `Semiring` and an `R`-algebra, and `B` is a `CommSemiring` and an `R`-algebra). It is not an instance because if A = B it causes a diamond. However in the many cases where A isn't B, it can occasionally be useful. However one could imagine that in the many cases where an R-module `M` also isn't `B`, it might occasionally be useful to make `M ⊗[R] B` into a `B`-module (and indeed I am finding this in FLT). With the current definition of `Algebra.TensorProduct.rightAlgebra` this is difficult to do without causing diamonds in the case when `M` happens to be an `R`-algebra (by which I mean "I failed to do this in finite time"). One fix for this is just to redefine `Algebra.TensorProduct.rightAlgebra` so that the `smul` field is ``` smul b ab := TensorProduct.comm _ _ _ (b • (TensorProduct.comm _ _ _ ab)) ``` i.e. literally "swap the product around, use mathlib's instance making `B ⊗[R] A` into a `B`-algebra, and then swap back". Then the same definition can be used to make `M ⊗[R] B` into a `B`-module and on the odd occasion where this point of view is useful, there is no diamond. This is what we do in this PR. After adding one simp lemma there is no breakage at all in mathlib. Furthermore, for those who have observed that we want to build on this algebra instance sometimes and, for example, add instances of the form "if M is finite over R then M ⊗[R] B is finite over B" -- these instances are really easy to add now with this new definition, because you simply pull back the analogous finite left module instance along the isomorphism M ⊗[R] B = B ⊗[R] M. Examples (from FLT, where the right action is put in a scope): ``` scoped instance [Module.Finite R M] : Module.Finite A (M ⊗[R] A) := Module.Finite.equiv (Module.TensorProduct.comm R A M) scoped instance [Module.Free R M] : Module.Free A (M ⊗[R] A) := Module.Free.of_equiv (Module.TensorProduct.comm R A M) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	10	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	141-46632 4 months ago	290-55783 290 days ago	56-85391 56 days
28972	themathqueen author:themathqueen	feat(LinearAlgebra/Matrix): star-algebra automorphisms on matrices are unitarily inner	Characterization of star-algebra automorphisms on matrices: for any star-algebra automorphism `f` on matrices, there exists a unitary matrix `U` such that `f x = U * x * star U`. More generally, this shows that given star-homomorphisms `f` and `g` from `B` to a star-algebra `A` and that the centralizer of `range g` is trivial, then `f x = U * g x * U⁻¹` for some invertible element `U` if and only if `f x = U * g x * star U` for some unitary `U`. Then a corollary to this and [AlgEquiv.eq_linearEquivConjAlgEquiv](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/GeneralLinearGroup/AlgEquiv.html#AlgEquiv.eq_linearEquivConjAlgEquiv) is that star-algebra automorphisms on matrices are unitarily inner. Another quick corollary to this and [ContinuousAlgEquiv.eq_continuousLinearEquivConjContinuousAlgEquiv](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.html#ContinuousAlgEquiv.eq_continuousLinearEquivConjContinuousAlgEquiv) is that star-algebra automorphisms on endomorphisms in `ℂ`-Hilbert spaces are unitarily inner. (See #33066 for the more general version of this.) --- - [x] depends on: #28100 - [x] depends on: #28182 - [x] depends on: #28881 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-author label:t-algebra$	138/0	Mathlib.lean,Mathlib/Analysis/Matrix/StarAlgEquiv.lean	2	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	141-31688 4 months ago	141-31688 141 days ago	1-44470 1 day
14444	digama0 author:digama0	fix(GeneralizeProofs): unreachable! bug	As [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Unreachable.20code.20reached.20in.20Lean.204.2E8.2E0/near/449286780). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	1/1	Mathlib/Tactic/GeneralizeProofs.lean	1	6	['github-actions', 'jcommelin', 'kmill', 'mathlib4-merge-conflict-bot', 'plby']	nobody	141-9803 4 months ago	672-25207 672 days ago	10-36842 10 days
25138	chrisflav author:chrisflav	chore(RingTheory/Ideal): make `RingHom.ker` take a `RingHom` instead of `RingHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	317/309	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Weierstrass.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/FieldTheory/PurelyInseparable/Tower.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/Adjoin/Tower.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Extension/Cotangent/Basis.lean,Mathlib/RingTheory/Extension/Cotangent/LocalizationAway.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteStability.lean,Mathlib/RingTheory/Finiteness/NilpotentKer.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IsAdjoinRoot.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Nullstellensatz.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/UniqueFactorization.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/AdicCompletion.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Flat.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	68	8	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	140-83611 4 months ago	360-14739 360 days ago	0-3642 1 hour
31018	joelriou author:joelriou	feat(CategoryTheory): the κ-accessible category of κ-directed posets	WIP --- - [x] depends on: #30727 - [x] depends on: #31767 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29565 - [x] depends on: #29854 - [x] depends on: #30459 - [x] depends on: #30605 - [x] depends on: #31426 - [x] depends on: #31421 - [x] depends on: #30633 - [x] depends on: #30634 - [x] depends on: #30693 - [x] depends on: #30696 - [x] depends on: #30781 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory	446/4	Mathlib.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalDirectedPoset.lean,Mathlib/CategoryTheory/Presentable/SharplyLT.lean,Mathlib/Order/Category/PartOrdEmb.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	140-42409 4 months ago	202-43617 202 days ago	0-1 1 second
33386	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): decidable instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP RFC	76/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Decidable.lean	2	1	['github-actions']	nobody	140-39806 4 months ago	unknown	0-0 0 seconds
33402	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/Generation): prove exceptional case in Dieudonné's theorem	Establish the fourth part of Dieudonné's theorem: is a linear equivalence is exceptional, it is the product of `finrank K (V ⧸ e.fixedSubmodule)` transvections and one dilatransvection. --- - [ ] depends on: #33348 - [ ] depends on: #33347 - [ ] depends on: #33387 - [ ] depends on: #33282 - [ ] depends on: #33392 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR file-removed label:t-algebra$	1572/222	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	8	12	['AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	139-66304 4 months ago	139-66305 139 days ago	0-705 11 minutes
24665	Komyyy author:Komyyy	feat(Mathlib/Topology/Metrizable/Uniformity): every uniform space is generated by a family of pseudometrics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-topology merge-conflict	54/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	139-26335 4 months ago	376-33277 376 days ago	0-1 1 second
33381	urkud author:urkud	feat: add a version of the Schwarz lemma	Add a version of the Schwarz lemma that is midway between the original lemma and Pick's version. Use it to show that a function that is separately holomorphic on a polydisc and is bounded on this polydisc must be continuous on it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #33368 - [x] depends on: #33362	t-analysis blocked-by-other-PR merge-conflict	475/91	Mathlib.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean	5	22	['girving', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	138-83444 4 months ago	140-51924 140 days ago	0-947 15 minutes
18805	astrainfinita author:astrainfinita	refactor: deprecate `SemilinearMapClass`	--- I'm not sure if we want to do this, but let's see if we can get a speed up from it first. - [ ] depends on: #18755 - [ ] depends on: #18756 - [ ] depends on: #18806 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-bench t-algebra blocked-by-other-PR merge-conflict label:t-algebra$	546/318	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/BigOperators/Balance.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Rat.lean,Mathlib/Algebra/Module/LocalizedModule/Int.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Data/Complex/BigOperators.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/RootsOfUnity/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Homeomorph.lean,Mathlib/Topology/MetricSpace/Isometry.lean,scripts/no_lints_prime_decls.txt	55	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	137-76024 4 months ago	unknown	0-0 0 seconds
33448	astrainfinita author:astrainfinita	refactor: deprecate `ContinuousLinearMapClass`	This PR continues the work from #18748. Original PR: https://github.com/leanprover-community/mathlib4/pull/18748	t-topology t-algebra awaiting-author merge-conflict label:t-algebra$	55/41	Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean	11	11	['Ruben-VandeVelde', 'astrainfinita', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	137-63648 4 months ago	137-63648 137 days ago	0-17239 4 hours
33462	eric-wieser author:eric-wieser	feat: teach `fun_prop` about `ContinousMultilinearMap.compContinuousLinearMap`	For now I've omitted the curried version --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	46/0	Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean	1	3	['github-actions', 'sgouezel']	nobody	137-27569 4 months ago	137-40807 137 days ago	137-40800 137 days
32725	joelriou author:joelriou	feat(CategoryTheory): presheaves of types which preserve a limit	Let `F : J ⥤ Cᵒᵖ` be a functor. We show that a presheaf `P : Cᵒᵖ ⥤ Type w` preserves the limit of `F` iff `P` is a local object with respect to a suitable family of morphisms in `Cᵒᵖ ⥤ Type w` (this family contains `1` or `0` morphism depending on whether the limit of `F` exists or not). --- - [x] depends on: #38257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author WIP	187/0	Mathlib.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Presheaf.lean	5	8	['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	136-70605 4 months ago	136-70605 136 days ago	3-82684 3 days
32840	joelriou author:joelriou	chore(CategoryTheory): remove the old Ext API	As it is now possible to compute `Ext`-groups (defined using the derived category) using an injective resolution #32105 or a projective resolution #32816, the old `Ext` API (based on left derived functors) is removed. WIP (more API for the new `Ext` is necessary...) --- - [ ] depends on: #32816 - [ ] depends on: #32105 - [ ] depends on: #32814 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory large-import merge-conflict WIP	546/116	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/Embedding/IsSupported.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/CategoryTheory/Abelian/Ext.lean,Mathlib/CategoryTheory/Abelian/Injective/Ext.lean,Mathlib/CategoryTheory/Abelian/Injective/Extend.lean,Mathlib/CategoryTheory/Abelian/Projective/Ext.lean,Mathlib/CategoryTheory/Abelian/Projective/Extend.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	136-64666 4 months ago	156-62156 156 days ago	0-408 6 minutes
33133	0xTerencePrime author:0xTerencePrime	feat(Algebra/Group/Center): add Decidable (IsMulCentral a) instance	This PR adds a `Decidable` instance for `IsMulCentral a`. ### Summary The structure `IsMulCentral` was missing a `Decidable` instance. This PR provides the instance by leveraging `isMulCentral_iff`, enabling decidability for both multiplicative and additive (via `to_additive`) structures. ### Verification - `lake build Mathlib.Algebra.Group.Center` passed. - `lake exe runLinter Mathlib.Algebra.Group.Center` passed.	t-algebra new-contributor awaiting-author label:t-algebra$	7/0	Mathlib/Algebra/Group/Center.lean	1	3	['github-actions', 'robin-carlier']	ocfnash assignee:ocfnash	136-61696 4 months ago	136-61696 136 days ago	12-60805 12 days
33191	sinhp author:sinhp	feat(CategoryTheory): Locally cartesian closed structure on presheaf categories	The category of presheaves on a small category `C` is locally cartesian closed. --- - [ ] depends on: #30375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR merge-conflict	703/0	Mathlib.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullbacksAlong.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ExponentiableMorphism.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Sections.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	136-28640 4 months ago	147-63471 147 days ago	0-31 31 seconds
28153	kckennylau author:kckennylau	feat(Simproc): Simproc for explicit diagonal matrices	```lean example : (diagonal ![37, -1] : Matrix (Fin 2) (Fin 2) ℤ) = !![37, 0; 0, -1] := by simp ``` --- Shares code with #28148. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	114/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Matrix.lean,scripts/noshake.json	4	6	['Vierkantor', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	136-12274 4 months ago	223-47693 223 days ago	58-77127 58 days
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict awaiting-author delegated t-meta	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	19	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	136-12226 4 months ago	263-42739 263 days ago	83-68773 83 days
28191	kckennylau author:kckennylau	feat(Logic): tag Injective, Surjective, and Bijective with fun_prop	--- Zulip: * [#Is there code for X? > surjective is not funprop!](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/surjective.20is.20not.20funprop!) * [#mathlib4 > `fun_prop` for Injective/Surjective/Bijective?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60fun_prop.60.20for.20Injective.2FSurjective.2FBijective.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	16/0	Mathlib/Tactic/FunProp.lean	1	6	['Vierkantor', 'github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	136-12212 4 months ago	223-51409 223 days ago	57-63332 57 days
30432	kckennylau author:kckennylau	feat(AlgebraicGeometry): define the non-vanishing locus of a set in Proj	Given a subset `s : Set A`, the non-vanishing locus of `s` is the set of points whose corresponding prime ideal does not fully contain `s`. In other words, where not all elements of `s` vanish. I could not find a name for this in the literature. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebraic-geometry	66/0	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean	1	4	['github-actions', 'jcommelin']	nobody	136-12184 4 months ago	175-60500 175 days ago	44-12068 44 days
27262	Timeroot author:Timeroot	feat(Tactic/Bound): bound? for proof scripts	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	22/7	Mathlib/Tactic/Bound.lean	1	13	['JovanGerb', 'Timeroot', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	136-4136 4 months ago	228-16461 228 days ago	13-18965 13 days
32389	LLaurance author:LLaurance	feat(Analysis): Trigonometric identities	`sin` and `cos` of real and complex integer multiples of π/12 --- Resolves https://github.com/leanprover-community/mathlib4/pull/28630#discussion_r2307957255 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	120/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	11	['LLaurance', 'artie2000', 'github-actions', 'j-loreaux']	nobody	135-68419 4 months ago	151-28750 151 days ago	15-36939 15 days
33502	MrQubo author:MrQubo	fix(Tactic/ProxyType): Pass params explicitly in proxy_equiv% implementation	Fix [#mathlib4 > `deriving Fintype` with Prop](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60deriving.20Fintype.60.20with.20Prop/with/566118621) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta WIP	12/2	Mathlib/Tactic/ProxyType.lean,MathlibTest/DeriveFintype.lean	2	7	['MrQubo', 'github-actions', 'kmill']	kmill assignee:kmill	135-28620 4 months ago	135-28621 135 days ago	0-60133 16 hours
21344	kbuzzard author:kbuzzard	chore: attempt to avoid diamond in OreLocalization	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-algebra label:t-algebra$	16/5	Mathlib/RingTheory/OreLocalization/Basic.lean	1	6	['erdOne', 'github-actions', 'kbuzzard']	nobody	134-24203 4 months ago	469-21898 469 days ago	1-35979 1 day
33112	alreadydone author:alreadydone	feat(GroupAction): `(M →[M] M) ≃* Mᵐᵒᵖ`	This comes up in #33108 in the form that permutations of a group commuting with the left multiplications are the right multiplications. The Semiring versions are already in mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory awaiting-author label:t-algebra$	41/3	Mathlib/GroupTheory/GroupAction/Hom.lean	1	2	['github-actions', 'robin-carlier']	mattrobball assignee:mattrobball	134-21047 4 months ago	136-56900 136 days ago	13-49137 13 days
27972	smmercuri author:smmercuri	refactor: make `Valuation.Completion` a `def` and refactor more of `AdicValuation.lean`	This PR continues the work from #24590. Original PR: https://github.com/leanprover-community/mathlib4/pull/24590	WIP t-number-theory t-algebra merge-conflict label:t-algebra$	188/87	Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	6	8	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	nobody	133-39786 4 months ago	243-61496 243 days ago	3-78979 3 days
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability please-adopt	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	32	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	133-31618 4 months ago	580-78855 580 days ago	9-73631 9 days
33586	CoolRmal author:CoolRmal	feat: Lower Limit Topology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	328/0	Mathlib.lean,Mathlib/Topology/Order/LowerUpperLimitTopology.lean	2	10	['CoolRmal', 'github-actions', 'plp127']	nobody	133-30320 4 months ago	unknown	0-0 0 seconds
24129	urkud author:urkud	feat: symmetry of Gateaux derivatives	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	189/1	Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Symmetric.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	133-7170 4 months ago	unknown	0-0 0 seconds
33640	JovanGerb author:JovanGerb	feat: tool for finding duplicate declarations	This PR defines a tool for finding duplicate declarations automatically. This can be used to help fix this technical debt. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	176/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DuplicateDecls.lean	3	1	['github-actions']	nobody	132-61096 4 months ago	133-13049 133 days ago	0-80 1 minute
33454	astrainfinita author:astrainfinita	feat: lemmas about `IsometryClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-analysis awaiting-author	60/37	Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/MetricSpace/DilationEquiv.lean,Mathlib/Topology/MetricSpace/Isometry.lean	5	8	['github-actions', 'j-loreaux']	urkud assignee:urkud	132-31447 4 months ago	132-31447 132 days ago	4-46572 4 days
33368	urkud author:urkud	feat: define `Complex.UnitDisc.shift`	Also review the existing API UPD: I'm going to define a `PSL(2, Real)` action instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-zulip merge-conflict	273/39	Mathlib.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean	3	7	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	j-loreaux assignee:j-loreaux	131-84612 4 months ago	132-44945 132 days ago	7-10690 7 days
33450	astrainfinita author:astrainfinita	refactor: deprecate `LinearIsometryClass`	--- - [ ] depends on: #33448 - [ ] depends on: #33454 This PR continues the work from #18755. Original PR: https://github.com/leanprover-community/mathlib4/pull/18755	t-algebra t-analysis blocked-by-other-PR t-topology merge-conflict label:t-algebra$	128/125	Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/MetricSpace/DilationEquiv.lean,Mathlib/Topology/MetricSpace/Isometry.lean	15	5	['astrainfinita', 'github-actions', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	131-84487 4 months ago	137-77278 137 days ago	0-304 5 minutes
33434	astrainfinita author:astrainfinita	chore: redefine `Finsupp.indicator` using `Finsupp.onFinset`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	6/17	Mathlib/Data/Finsupp/Indicator.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	131-53577 4 months ago	39-30733 39 days ago	5-35275 5 days
33554	themathqueen author:themathqueen	chore(Analysis/Normed/Module/Normalize): allow for `RCLike` instead of just the reals	Only the last lemma `normalize_smul` needs `ℝ`, which we rename to `normalize_real_smul`. This also makes `𝕜` explicit in half of the results. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict	67/60	Mathlib/Analysis/CStarAlgebra/Unitary/Span.lean,Mathlib/Analysis/Normed/Module/Normalize.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Euclidean/SignedDist.lean	5	4	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	131-41459 4 months ago	132-34208 132 days ago	1-85731 1 day
27507	grunweg author:grunweg	wip(commandStart): check the indentation of declaration keywords also	Check that e.g. a `lemma` keyword always starts on column 1 (unless preceded by an attribute). --- TODO: - make this work for other declarations also - the position reported for the lemma column is not helpful (it might be the absolute column in the file, but that's missing line information) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-linter merge-conflict	84/1	Mathlib/Tactic/Linter/CommandStart.lean,MathlibTest/CommandStart.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	131-20396 4 months ago	296-63202 296 days ago	0-2 2 seconds
33330	michael-novak-math author:michael-novak-math	feat: add arc-length reparametrization of parametrized curves	add new definitions of arc-length reparametrization and its corresponding parameter transformation and a theorem establishing the desired properties.	t-analysis new-contributor awaiting-author merge-conflict	311/0	Mathlib.lean,Mathlib/Analysis/Calculus/ArcLengthReparametrization.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	57	['SnirBroshi', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'michael-novak-math']	j-loreaux assignee:j-loreaux	131-12573 4 months ago	55-73700 55 days ago	6-69934 6 days
24010	grunweg author:grunweg	feat(Counterexamples): a non-negative function, not a.e. zero, with vanishing lowe…	…r Lebesgue integral. Came up in #23707, let's document this while we're at it. --- - [ ] depends on: #20722 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict please-adopt WIP blocked-by-other-PR t-measure-probability	110/0	Counterexamples.lean,Counterexamples/LIntegralZero.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	130-56248 4 months ago	400-31293 400 days ago	0-22 22 seconds
33756	dleijnse author:dleijnse	feat(FieldTheory): root of polynomial with p power coefficients	This PR proves the results in https://stacks.math.columbia.edu/tag/031V, which gives a criterion for a root of a polynomial over a field `k` of characteristic `p` to be a `p`-th power. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	88/0	Mathlib.lean,Mathlib/FieldTheory/PthPowerCoeffPoly.lean	2	1	['github-actions']	nobody	130-50118 4 months ago	unknown	0-0 0 seconds
28700	Timeroot author:Timeroot	feat(ModelTheory): Set.Definable is transitive	--- This PR continues the work from #19695. Original PR: https://github.com/leanprover-community/mathlib4/pull/19695 - [x] depends on: #26332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict large-import	529/8	Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	5	9	['Timeroot', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	130-49959 4 months ago	48-30112 48 days ago	3-9082 3 days
30608	grunweg author:grunweg	feat: another lemma about derivatives of parametric integrals	On the path towards proving that integrating smooth functions is smooth. From the sphere-eversion project; I am just upstreaming this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	125/0	Mathlib/Analysis/Calculus/ParametricIntegral.lean	1	8	['Ruben-VandeVelde', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	130-44958 4 months ago	195-49527 195 days ago	18-81847 18 days
30610	grunweg author:grunweg	feat: yet another lemma about differentiability of parametric integrals	From sphere-eversion. --- TODO: explicitly make Floris a co-author again - [ ] depends on: #30608 - [ ] depends on: #30612 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-analysis	193/0	Mathlib/Analysis/Calculus/ParametricIntegral.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	130-44957 4 months ago	214-44697 214 days ago	0-7778 2 hours
33299	kingiler author:kingiler	feat: Add decidable membership for Interval	Implemented membership and corresponding decidable instance for `Interval`. Related [#mathlib4 > Proposal: Add decidable membership for Interval](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Proposal.3A.20Add.20decidable.20membership.20for.20Interval/with/565438009). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor t-order	16/1	Mathlib/Order/Interval/Basic.lean	1	5	['Vierkantor', 'eric-wieser', 'github-actions', 'kingiler']	Vierkantor assignee:Vierkantor	130-41924 4 months ago	130-41924 130 days ago	13-42146 13 days
30142	shalliso author:shalliso	feat(Topology/Baire): define IsNonMeagre	non-meagre sets (also known as "of the second category") are worthy of their own definition and API. This was useful to me for formalizing a result of "automatic continuity", that is, a Baire-measurable homomorphism between Polish groups must be continuous. Simply working with the negation of IsMeagre quickly became cumbersome, and non-meagre sets have an important role in the study of Polish (e.g. locally compact) groups. From https://github.com/shalliso/automatic_continuity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor merge-conflict awaiting-author	83/1	Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean	2	6	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	129-51608 4 months ago	129-51609 129 days ago	98-58846 98 days
30953	kim-em author:kim-em	experiment: add `canonical` to Mathlib	Depends on (these must be merged first before CI will succeed here) - [x] #30952 - [x] #30844	merge-conflict	63/3	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/canonical.lean,lake-manifest.json,lakefile.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	129-22468 4 months ago	203-19920 203 days ago	0-865 14 minutes
32470	ADedecker author:ADedecker	feat: the space of test functions is barrelled	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	22/0	Mathlib/Analysis/Distribution/TestFunction.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	129-21982 4 months ago	unknown	0-0 0 seconds
33102	adomani author:adomani	perf: add a syntactic check for flexible linter	This is very preliminary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	205/2	Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/FlexibleLinter.lean	2	10	['adomani', 'github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot']	nobody	129-21856 4 months ago	unknown	0-0 0 seconds
30562	dwrensha author:dwrensha	fix(Data/Fintype/Perm): make the main logic of Equiv.instFintype irreducible	Adds a new `irreducible_def` for the main branch of `Equiv.instFintype` to avoid errors about deep recursion. This is an update of #15045 and #30560 according to the discussion in those PRs and in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/kernel.20deep.20recursion.20detected/near/454301820). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	44/10	Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Matrix/Cartan.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,MathlibTest/MatrixDetOne.lean	5	18	['dwrensha', 'github-actions', 'leanprover-bot', 'plp127', 'robin-carlier']	robin-carlier assignee:robin-carlier	129-18941 4 months ago	203-52326 203 days ago	12-56370 12 days
33669	eric-wieser author:eric-wieser	chore(Data/Nat/Digits): refactor to use List.rightpad	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	32/12	Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Digits/Lemmas.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot', 'xroblot']	nobody	128-73973 4 months ago	132-42663 132 days ago	0-237 3 minutes
25905	mans0954 author:mans0954	feat(RingTheory/Polynomial/SmallDegreeVieta): polynomial versions of results in Algebra.QuadraticDiscriminant	This PR continues the work from #25605. Original PR: https://github.com/leanprover-community/mathlib4/pull/25605	merge-conflict t-ring-theory please-adopt	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	47	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'mathlib4-merge-conflict-bot', 'ocfnash']	chrisflav assignee:chrisflav	128-20511 4 months ago	254-48890 254 days ago	82-4874 82 days
26339	mans0954 author:mans0954	feat(Analysis/Normed/Module/WeakDual): Banach Dieudonné Lemma	This PR continues the work from #16316. Original PR: https://github.com/leanprover-community/mathlib4/pull/16316	merge-conflict WIP t-analysis large-import please-adopt	377/3	Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/UniformSpace/Cauchy.lean	4	5	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-20472 4 months ago	328-76921 328 days ago	0-1087 18 minutes
26340	mans0954 author:mans0954	feat(Algebra/Module/NestAlgebra): Nest algebras	This PR continues the work from #18705. Original PR: https://github.com/leanprover-community/mathlib4/pull/18705	merge-conflict t-algebra please-adopt label:t-algebra$	184/0	Mathlib.lean,Mathlib/Algebra/Module/NestAlgebra.lean,Mathlib/Order/Nest.lean,Mathlib/Order/Preorder/Chain.lean,docs/references.bib	5	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-20456 4 months ago	323-32362 323 days ago	5-45567 5 days
26342	mans0954 author:mans0954	WiP: Expansion of the tensor product of quadratic maps over a linear combination	This PR continues the work from #19806. Original PR: https://github.com/leanprover-community/mathlib4/pull/19806	WIP t-algebra please-adopt label:t-algebra$	483/0	Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	4	2	['github-actions', 'mans0954']	nobody	128-20448 4 months ago	unknown	0-0 0 seconds
26341	mans0954 author:mans0954	feat(LinearAlgebra/QuadraticForm/Basis): Free Tensor product of Quadratic Maps	This PR continues the work from #19432. Original PR: https://github.com/leanprover-community/mathlib4/pull/19432	merge-conflict WIP t-algebra large-import please-adopt label:t-algebra$	888/0	Mathlib.lean,Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	3	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-20225 4 months ago	328-77523 328 days ago	0-259 4 minutes
26343	mans0954 author:mans0954	feat(Analysis/Normed/Module/Complemented): The idempotent associated with a complemented subspace	Given a complemented subspace `p` of a Banach space `E`, with complement `q`, there exists an idempotent `P` in the ring `E →L[𝕜] E` such that `P` has range `p` and kernel `q`. Similarly `1-P` has range `q` and kernel `p`. See Rudin, Functional Analysis, Theorem 5.16. --- This PR continues the work from #20330. Original PR: https://github.com/leanprover-community/mathlib4/pull/20330 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI large-import merge-conflict t-analysis please-adopt	185/3	Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/RingTheory/Idempotents.lean	5	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-20218 4 months ago	unknown	0-0 0 seconds
26344	mans0954 author:mans0954	feat(Analysis/NormedSpace/MStructure): The component projections on WithLp 1 (α × β) are L-projections	This PR continues the work from #20380. Original PR: https://github.com/leanprover-community/mathlib4/pull/20380	merge-conflict WIP t-analysis file-removed please-adopt	20/1	Mathlib.lean,Mathlib/Analysis/Normed/Lp/MStructure.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean	3	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-15021 4 months ago	323-33015 323 days ago	5-43696 5 days
26346	mans0954 author:mans0954	feat(LinearAlgebra/QuadraticForm/TensorProduct): Extend `baseChange_ext` to work over a free module	This PR continues the work from #21814. Original PR: https://github.com/leanprover-community/mathlib4/pull/21814	merge-conflict WIP t-algebra please-adopt label:t-algebra$	105/5	Mathlib/LinearAlgebra/Basis/Bilinear.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	2	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-15002 4 months ago	unknown	0-0 0 seconds
26347	mans0954 author:mans0954	feat(Data/Finset/RangeDistance): abs_sub_lt_of_mem_finset_range	This PR continues the work from #23161. Original PR: https://github.com/leanprover-community/mathlib4/pull/23161	merge-conflict t-data please-adopt	30/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	alreadydone assignee:alreadydone	128-14998 4 months ago	180-75496 180 days ago	148-922 148 days
26349	mans0954 author:mans0954	feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3	This PR continues the work from #25009. Original PR: https://github.com/leanprover-community/mathlib4/pull/25009	help-wanted t-analysis please-adopt	159/0	Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean	4	3	['github-actions', 'mans0954', 'themathqueen']	nobody	128-14954 4 months ago	323-33299 323 days ago	5-42837 5 days
26348	mans0954 author:mans0954	feat(Analysis/LocallyConvex/Prime): the prime map	This PR continues the work from #24385. Original PR: https://github.com/leanprover-community/mathlib4/pull/24385	merge-conflict WIP t-analysis please-adopt	125/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Prime.lean	2	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-14945 4 months ago	323-33250 323 days ago	5-43062 5 days
26983	mans0954 author:mans0954	feat(Order/LatticeElements): distributive, standard and neutral elements of a lattice	Defines distributive, standard and neutral elements of a lattice and gives equivalent conditions. --- - [x] depends on: #26836 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order please-adopt	238/0	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/LatticeElements.lean	3	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	128-14912 4 months ago	225-39169 225 days ago	0-20134 5 hours
29980	mans0954 author:mans0954	refactor(RingTheory/Polynomial/Resultant/Quadratic): Re-implement QuadraticDiscriminant for R[X]	Re-implement `Algebra/QuadraticDiscriminant` for polynomials. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/discriminants.20of.20low.20degree.20polynomials/with/538010519) --- - [ ] depends on: #29981 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict please-adopt	208/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/Resultant/Quadratic.lean	2	4	['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	128-14879 4 months ago	180-74233 180 days ago	41-47807 41 days
29387	mans0954 author:mans0954	feat(Analysis/LocallyConvex/WeakSpace): toWeakSpace_closedAbsConvexHull_eq	The closed absolutely convex hull taken in the weak topology coincides with the closed absolutely convex hull taken in the original topology. --- - [ ] depends on: #29378 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-analysis please-adopt	133/68	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean	6	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	128-14860 4 months ago	254-36722 254 days ago	0-2474 41 minutes
30393	mans0954 author:mans0954	WIP: Bipolar theorem absconvex refactor	Experiment to see what happens when #26345 and #29342 are merged. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP large-import please-adopt	383/138	Mathlib.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Topology/Algebra/Module/LinearSpan.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	128-14716 4 months ago	unknown	0-0 0 seconds
29378	mans0954 author:mans0954	feat(Analysis/LocallyConvex/AbsConvex): Balanced and AbsConvex sets under linear maps	Provide `Balanced` and `AbsConvex` versions of `Convex.linear_image`, `Convex.linear_preimage` and the `is_linear` equivalents. --- - [ ] depends on: #29342 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis please-adopt	133/68	Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/AbsConvexOpen.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Module/Dual.lean	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	128-14700 4 months ago	216-4601 216 days ago	0-14664 4 hours
26337	mans0954 author:mans0954	feat(Analysis/NormedSpace/MStructure): M-ideals	This PR continues the work from #14369. Original PR: https://github.com/leanprover-community/mathlib4/pull/14369	merge-conflict WIP t-analysis large-import please-adopt	857/40	Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/Analysis/NormedSpace/MStructure.lean	5	4	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	128-14441 4 months ago	unknown	0-0 0 seconds
31981	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): `tangentSet` and `tangentsFrom` lemmas	Add lemmas relating the faces of a simplex to `tangentSet` and `tangentsFrom` for an exsphere, in particular for a triangle that any two side lines are the `tangentsFrom` their shared vertex to the insphere or any exsphere. --- - [ ] depends on: #31733 - [ ] depends on: #31891 - [ ] depends on: #31892 - [ ] depends on: #31893 - [x] depends on: #31978 - [ ] depends on: #31979 - [x] depends on: #31980 - [ ] depends on: #32296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	578/9	Mathlib.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean	5	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	127-8258 4 months ago	177-10114 177 days ago	0-1725 28 minutes
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	2	['urkud']	nobody	127-2019 4 months ago	711-62487 711 days ago	9-15083 9 days
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	12	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	127-1926 4 months ago	731-57751 731 days ago	1-73101 1 day
28070	grunweg author:grunweg	style: improve indentation of multi-linear enumerations in doc-strings	Per zulip discussion: [#mathlib4 > Style :bicycle: : indenting second lines in doc-strings @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Style.20.3Abicycle.3A.20.3A.20indenting.20second.20lines.20in.20doc-strings/near/533105734). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	111/108	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/CategoryTheory/Abelian/NonPreadditive.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Condensed/Discrete/Characterization.lean,Mathlib/FieldTheory/ChevalleyWarning.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,docs/Conv/Guide.lean	16	8	['github-actions', 'grunweg', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	127-1803 4 months ago	283-57282 283 days ago	1-19000 1 day
29077	grunweg author:grunweg	feat(Manifold/Instances/Icc): golf smoothness proof using immersions	Prove that the inclusion of an interval into the real numbers is a smooth immersion, and use this to golf the proof that this inclusion is smooth. TODO: right now, the computation doesn't check out; I need to tweak the charts I have. But that is surely doable. A future PR will prove it is a smooth embedding. --- - [ ] depends on: #28865 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-differential-geometry	1122/56	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Topology/PartialHomeomorph.lean,docs/references.bib,temp_.sh	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	126-48810 4 months ago	263-38659 263 days ago	0-309 5 minutes
32880	0xTerencePrime author:0xTerencePrime	feat(Analysis/Asymptotics): define subpolynomial growth	## Main definitions * `Asymptotics.IsSubpolynomial l f g`: A function `f` has subpolynomial growth with respect to `g` along filter `l` if `f = O(1 + ‖g‖^k)` for some natural `k`. ## Main results * `IsSubpolynomial.const`: Constant functions have subpolynomial growth * `IsSubpolynomial.id`: Identity has subpolynomial growth * `IsSubpolynomial.add`: Closure under addition * `IsSubpolynomial.neg`: Closure under negation * `IsSubpolynomial.sub`: Closure under subtraction * `IsSubpolynomial.mul`: Closure under multiplication * `IsSubpolynomial.pow`: Closure under powers * `isSubpolynomial_iff_one_add`: Equivalence with `(1 + ‖g‖)^k` formulation * `IsSubpolynomial.uniform`: Uniform bounds for finite families ## Implementation notes The definition uses `1 + ‖g‖^k` rather than `(1 + ‖g‖)^k` as the primary form, with the equivalence established in `isSubpolynomial_iff_one_add`. Four private auxiliary lemmas handle the key inequalities needed for closure proofs. Closes #32658	awaiting-author t-analysis new-contributor	185/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean	2	29	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	126-34692 4 months ago	127-16150 127 days ago	22-14560 22 days
33814	seewoo5 author:seewoo5	feat(Manifold/MFDeriv): add `MDifferentiable.pow` with FunProp	--- - [ ] depends on: #33808 Tag `MDifferentiable.pow` with `fun_prop`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR merge-conflict	22/0	Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Defs.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	125-26180 4 months ago	128-71803 128 days ago	0-8651 2 hours
33948	anivegesana author:anivegesana	feat(Analysis/Normed/Algebra): matrix exponential of nilpotent matrix	Where the matrix exponential and nilpotent elements are defined, both the matrix exponential and the nilpotent element exponential. I had to add a different theorem for normed space exponential and the matrix exponential since the right instances wouldn't be synthesized. Help with golfing would be appreciated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	34/0	Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean	2	1	['github-actions']	nobody	124-85677 4 months ago	124-85749 124 days ago	124-85742 124 days
30030	JonBannon author:JonBannon	feat(MeasureTheory): add `MemLp.Const` class and instances to unify `p = ∞` and `μ.IsFiniteMeasure` cases	Although it is possible to ensure that, for example, the `One` instances for `p=∞` and `μ.IsFiniteMeasure` are defeq, introducing an `MemLp.Const` typeclass removes the need to unfold extensively to check this definitional equality, improving performance. cf. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Lp.20constant.20function.20issue/with/537563137 This PR introduces the requisite class and associated instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-measure-probability merge-conflict	224/136	Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousCompMeasurePreserving.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/SeparableMeasure.lean	13	25	['JonBannon', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	124-48732 4 months ago	213-41838 213 days ago	12-73357 12 days
33807	adamtopaz author:adamtopaz	feat: TypeCat refactor	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	114/0	ConstGraph/Main.lean,Mathlib/CategoryTheory/Types/Basic.lean,lakefile.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	124-46041 4 months ago	129-30231 129 days ago	0-1 1 second
29610	llllvvuu author:llllvvuu	feat(LinearAlgebra): define LinearMap.Eigenbasis	Some theorems are left TODO for follow-up work. The definition is from @eric-wieser ([#Is there code for X? > diagonalizable linear maps @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/diagonalizable.20linear.20maps/near/539163222)). Co-authored-by: Aristotle Harmonic --- - [x] depends on: #29420 (golfs some `[Nontrivial R]` assumptions) - [x] depends on: #29791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author label:t-algebra$	455/5	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/LinearAlgebra/Eigenbasis.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/Order/CompleteLattice/Basic.lean	5	31	['github-actions', 'joelriou', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	124-40335 4 months ago	180-74271 180 days ago	20-33900 20 days
27493	themathqueen author:themathqueen	feat(RingTheory/Coalgebra): define Frobenius algebra	A Frobenius algebra `A` has the structure of both an algebra and a coalgebra such that: `(mul ⊗ id) ∘ assoc.symm ∘ (id ⊗ comul) = comul ∘ mul = (id ⊗ mul) ∘ assoc ∘ (comul ⊗ id)`. In diagrams this law looks like: ![](https://ncatlab.org/nlab/files/frobenius_laws.jpg) It suffices to show that `(mul ⊗ id) ∘ assoc.symm ∘ (id ⊗ comul) = (id ⊗ mul) ∘ assoc ∘ (comul ⊗ id)`. --- - [x] depends on: #27567 - [x] depends on: #27569 - [x] depends on: #32245 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author blocked-by-other-PR	163/0	Mathlib.lean,Mathlib/RingTheory/FrobeniusAlgebra.lean	2	25	['YaelDillies', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'themathqueen']	alreadydone assignee:alreadydone	124-23501 4 months ago	19-25411 19 days ago	66-3711 66 days
33992	tb65536 author:tb65536	feat(NumberTheory/NumberField/ExistsRamified): Galois group is generated by inertia subgroups	This PR proves that `Gal(K/ℚ)` is generated by its inertia subgroups (because otherwise the fixed field would be an unramified extension of `ℚ`). --- - [x] depends on: #30666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	101/0	Mathlib/NumberTheory/NumberField/ExistsRamified.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	123-68865 4 months ago	11-26860 11 days ago	0-8682 2 hours
30582	RemyDegenne author:RemyDegenne	feat: extension of a function to the closure of a submodule	- define the closure of a set in a complete space as an `AbstractCompletion` - add instances about submodules - add a coercion from a submodule to its topological closure - add induction lemmas on topological closures of submodules - define the extension of a function on a submodule to the closure of a submodule --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP merge-conflict	138/1	Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean	2	8	['ADedecker', 'RemyDegenne', 'github-actions', 'mathlib4-merge-conflict-bot', 'mcdoll']	PatrickMassot and mcdoll assignee:PatrickMassot assignee:mcdoll	123-52189 4 months ago	166-69622 166 days ago	35-55566 35 days
32436	thorimur author:thorimur	feat: `unusedFactInType` linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter	55/3	Mathlib/Init.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	123-32060 4 months ago	unknown	0-0 0 seconds
33535	erdOne author:erdOne	feat(Algebra/Category): `Under.pushout` preserves finite limits for flat homomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra merge-conflict label:t-algebra$	157/5	Mathlib.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/CommAlgCat/BaseChange.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/Ring/Flat.lean	8	5	['chrisflav', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'robin-carlier']	eric-wieser assignee:eric-wieser	123-22200 4 months ago	123-50303 123 days ago	11-30775 11 days
28631	faenuccio author:faenuccio	feat(Data\Nat\ModEq.lean): add grind attribute to ModEq	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-data merge-conflict	7/0	Mathlib/Data/Nat/ModEq.lean	1	5	['faenuccio', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	123-4144 4 months ago	272-70919 272 days ago	0-22 22 seconds
30391	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	This PR continues the work from #24395. Original PR: https://github.com/leanprover-community/mathlib4/pull/24395	t-data new-contributor awaiting-author	108/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	50	['BoltonBailey', 'IlPreteRosso', 'TwoFX', 'Vierkantor', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'rudynicolop']	TwoFX assignee:TwoFX	122-53023 4 months ago	122-61545 122 days ago	93-10043 93 days
33126	CoolRmal author:CoolRmal	feat: function composition preserves boundedness	This PR adds the following theorem: if the range of a function `g` is bounded above, then `g ∘ f` is bounded above for all functions `f`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	12/0	Mathlib/Order/Bounds/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	122-51490 4 months ago	122-51491 122 days ago	27-6197 27 days
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology infinity-cosmos t-meta please-adopt will-close-soon	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	24	['eric-wieser', 'gio256', 'github-actions', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	122-51277 4 months ago	302-28417 302 days ago	88-84229 88 days
31348	PatrickMassot author:PatrickMassot	chore: fix a docstring typo	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation awaiting-author t-analysis	1/1	Mathlib/Analysis/Calculus/Darboux.lean	1	3	['ADedecker', 'dopamine333', 'github-actions']	nobody	122-47220 4 months ago	192-53692 192 days ago	0-21655 6 hours
10991	thorimur author:thorimur	feat: `tfae` block tactic	This PR introduces `tfae` block tactic syntax: ```lean tfae 1 → 2 := /- proof of `P₁ → P₂` -/ 2 → 3 := /- proof of `P₂ → P₃` -/ 3 → 1 := /- proof of `P₃ → P₁` -/ ``` Like the recent change to `tfae_have`, this syntax also supports all sorts of matching that `have` itself supports: ```lean tfae 2 → 3 \| h₂ => /- proof of `P₃` -/ 3 → 1 -- given `P₁ := ∀(a : A), (b : B), (c : C), X`: \| h₃, a, b, c => /- proof of `X` -/ ⟨h_mp, h_mpr⟩ : 1 ↔ 2 := /- proof of `P₁ ↔ P₂`; puts `h_mp : P₁ → P₂`, `h_mpr : P₂ → P₁` in the lctx -/ ``` This initial implementation is currently very simple, and relies on `tfae_have` and `tfae_finish`. Although we intend to migrate away from that syntax, this PR does not remove support for it or deprecate `tfae_have`/`tfae_finish` in any way; migration (but not deprecation) is done in #11003. --- - [x] depends on: #10653 - [x] depends on: #10994 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP modifies-tactic-syntax t-meta	392/124	Mathlib/Tactic/TFAE.lean,scripts/noshake.json,test/tfae.lean	3	5	['github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'thorimur']	joneugster assignee:joneugster	122-37150 4 months ago	606-1019 606 days ago	7-13967 7 days
29282	Jlh18 author:Jlh18	feat(CategoryTheory): HasColimits instance on Grpd	Show that the category of groupoids has all small colimits, as a coreflective subcategory of `Cat`, which has all small colimits. The right adjoint of the forgetful functor is the core functor `CategoryTheory.Core.functor`. - [ ] depends on: #29283 [Core of a category as a functor] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-category-theory	140/4	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Colimit.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	120-63103 4 months ago	258-8487 258 days ago	0-396 6 minutes
29587	uniwuni author:uniwuni	feat(GroupTheory/Finiteness): define finitely generated semigroups	We define finitely generated semigroups and basics similarly to monoids and groups and prove that semigroups and monoids remain finitely generated when a congruence is quotiented out. This will be important when further developing semigroup theory. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-group-theory	259/14	Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/GroupTheory/Finiteness.lean	2	4	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'uniwuni']	dupuisf assignee:dupuisf	120-63059 4 months ago	222-67963 222 days ago	25-78230 25 days
28796	grunweg author:grunweg	feat: immersions are smooth	The conventional textbook definition demands that an immersion be smooth. When asking for the immersion to have local slice charts (as we do), this implies smoothness automatically. --- - [x] depends on: #28701 - [x] depends on: #28793 - [x] depends on: #30356 - [x] depends on: #28853 (for simplicity) - [x] depends on: #36816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author merge-conflict	192/21	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	6	57	['chrisflav', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	PatrickMassot assignee:PatrickMassot	120-39251 4 months ago	123-40105 123 days ago	0-1863 31 minutes
28905	grunweg author:grunweg	feat: immersions are locally embeddings	Hopefully, this can be used for the topological portion of #28865. (That part is not certain yet, the rest works.) --- Needs some clean-up in both the immersions file, and need to move the helper results about embeddings to the correct location. - [x] depends on: #28793 - [ ] depends on: #28796 - [x] depends on: #28853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict t-differential-geometry	331/15	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	120-39250 4 months ago	266-40664 266 days ago	0-397 6 minutes
30504	grunweg author:grunweg	feat: add custom elaborators for immersions	And golf the fail using it, a bit. Other usage sites expose bugs or unexpected error messages... TODO: add basic tests for basic usage TODO: fix those errors (then try to golf further! --- - [x] depends on: #30307 - [x] depends on: #30356 - [ ] depends on: #28796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-meta t-differential-geometry merge-conflict	286/87	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	6	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	120-39004 4 months ago	217-57234 217 days ago	0-13 13 seconds
32745	LTolDe author:LTolDe	feat(Topology/Algebra): add MulActionConst.lean	add Topology/Algebra/MulActionConst.lean introduce class `ContinuousSMulConst` for a scalar multiplication that is continuous in the first argument, in analogy to `ContinuousConstSMul` define `MulAction.ball x U` as the set `U • {x}` given `[SMul G X] (x : X) (U : Set G)` The lemmas shown here will be useful to prove the Effros Theorem, see [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor t-topology	117/0	Mathlib.lean,Mathlib/Topology/Algebra/MulActionConst.lean	2	8	['LTolDe', 'github-actions', 'urkud']	nobody	119-48969 3 months ago	126-28499 126 days ago	16-33128 16 days
34134	Paul-Lez author:Paul-Lez	feat(Mathlib/Analysis/PDE/Quasilinear/Characteristics): the method of characteristics for first order quasilinear PDEs	This PR continues the work from #25710. Original PR: https://github.com/leanprover-community/mathlib4/pull/25710	WIP t-analysis	620/0	Mathlib.lean,Mathlib/Analysis/PDE/Quasilinear/Characteristics.lean,Mathlib/Analysis/PDE/Quasilinear/Defs.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	4	3	['Paul-Lez', 'github-actions', 'mcdoll']	nobody	118-62907 3 months ago	119-60254 119 days ago	0-146 2 minutes
33478	anishrajeev author:anishrajeev	feat(ModelTheory): define a subset of the topology over complete types	Define a subset of the Stone Space over a language expanded with countably many constants. Define the proposition to indicate if a language is countable. The subset's density and openness is a future goal to prove (have a branch where it is almost finished), in pursuit of formalizing the proof of the Omitting Types Theorem via properties of Baire spaces. - [ ] depends on: #32215 - [ ] depends on: #32546	t-logic merge-conflict new-contributor blocked-by-other-PR	160/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	8	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	118-42488 3 months ago	126-56312 126 days ago	10-38484 10 days
30853	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/Simplex): `CoeFun` instance for `Simplex`	This PR introduces the notation `s i` to refer to the `i`th vertex of simplex `s`, which replaces the current `s.points i`. It does this by adding a `CoeFun` instance. I first tried using `FunLike`, but this came with some different problems related to discrimination tree indexing in `simp`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-euclidean-geometry merge-conflict	381/371	Archive/Imo/Imo2019Q2.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Normed/Affine/Simplex.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Angle/Sphere.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/Geometry/Euclidean/Simplex.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Centroid.lean,scripts/nolints.json	15	14	['JovanGerb', 'eric-wieser', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot']	jsm28 assignee:jsm28	118-11205 3 months ago	164-49978 164 days ago	41-18647 41 days
34195	eric-wieser author:eric-wieser	feat: continuous bundled actions	These are `Continuous` versions of existing definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-algebra large-import label:t-algebra$	59/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	117-72701 3 months ago	61-32826 61 days ago	0-1929 32 minutes
34238	Ruben-VandeVelde author:Ruben-VandeVelde	feat: some lemmas about AlgHom 1 and *	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	22/0	Mathlib/Algebra/Algebra/Hom.lean	1	5	['Ruben-VandeVelde', 'Vierkantor', 'eric-wieser', 'github-actions']	nobody	116-63773 3 months ago	116-63773 116 days ago	0-45401 12 hours
31092	FlAmmmmING author:FlAmmmmING	feat(Algebra/Group/ForwardDiff.lean): Add theorem `sum_shift_eq_fwdDiff_iter`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	17/1	Mathlib/Algebra/Group/ForwardDiff.lean	1	20	['BeibeiX0', 'FlAmmmmING', 'Ruben-VandeVelde', 'dagurtomas', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	116-49988 3 months ago	116-49988 116 days ago	54-22055 54 days
34141	gululu996-ui author:gululu996-ui	feat(Combinatorics/SimpleGraph/Acyclic): finite trees have at least two degree-one vertices	Add a lemma showing that a finite tree with at least two vertices has at least two vertices of degree 1. - Introduce a helper lemma `SimpleGraph.Connected.one_le_degree` for connected graphs on a nontrivial finite type. - Prove the leaf-count lower bound via the degree-sum identity and a counting argument. ---	awaiting-author new-contributor t-combinatorics	72/2	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['IvanRenison', 'SnirBroshi', 'github-actions', 'vlad902']	nobody	116-46246 3 months ago	118-27682 118 days ago	1-23617 1 day
29014	ShreckYe author:ShreckYe	feat(Data/List/Scan): some theorems that relate `scanl` with `foldl`	I am not sure which is the best form of `getElem_scanl_eq_foldl_take` here, so I added several alternative forms. Feel free to remove any of them if necessary.	merge-conflict t-data	35/0	Mathlib/Data/List/Scan.lean	1	15	['ShreckYe', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	pechersky assignee:pechersky	116-42283 3 months ago	190-7328 190 days ago	74-59834 74 days
33689	BoltonBailey author:BoltonBailey	feat(Probability): PMF point mass function	This PR defines a pointMass function, which returns the value of a PMF at a point as a `NNReal`. --- Perhaps `unitInterval` would be better? Note: A number of Zulip discussions lists below have discussed what the return type of `PMF` should be and if the definition should be refactored. This PR avoids this by simply creating a new function, but depends on a PR from these discussions to not cause a collision. Zulip: - [#new members > Why is the codomain of PMF in mathlib ENNReal and not NNReal @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Why.20is.20the.20codomain.20of.20PMF.20in.20mathlib.20ENNReal.20and.20not.20NNReal/near/526572449) - [#new members > Performing arithmetic with ENNReals @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Performing.20arithmetic.20with.20ENNReals/near/525936290) - [#Is there code for X? > Statistical distance for `PMF`s? @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Statistical.20distance.20for.20.60PMF.60s.3F/near/525234190) - [#mathlib4 > PMF Refactor: FunLike vs Definition Change](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/PMF.20Refactor.3A.20FunLike.20vs.20Definition.20Change/with/567771586) - [ ] depends on: #34138 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP blocked-by-other-PR	93/0	Mathlib/Probability/ProbabilityMassFunction/PointMass.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	116-34109 3 months ago	unknown	0-0 0 seconds
33680	BoltonBailey author:BoltonBailey	feat(Probability/ProbabilityMassFunction): add Total Variation distance	Adds the statistical distance/total variation distance. See Zulip discussion: - [#Is there code for X? > total variation distance between two PMFs](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/total.20variation.20distance.20between.20two.20PMFs/with/566810511) This PR was authored with the support of Claude Opus 4.5 --- - [ ] depends on: #33689 [provide an API for NNReal-returning function] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR LLM-generated	47/0	Mathlib/Probability/ProbabilityMassFunction/Distance.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	115-81713 3 months ago	115-81861 115 days ago	16-37540 16 days
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [x] depends on: #24570 - [x] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author please-adopt	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	21	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	115-71012 3 months ago	367-45345 367 days ago	43-17409 43 days
34086	adomani author:adomani	perf: test the effect of localizing the whitespace linter	This PR checks whether the modification contained in #26299 have a positive effect on this one. The other PR has a few minor regressions, but hopefully this PR has very substantial speed ups. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	2076/462	Archive/Imo/Imo2010Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/HeawoodUnitDistance.lean,Counterexamples/MonicNonRegular.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Module/TransferInstance.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/CategoryTheory/Comma/Over/OverClass.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/OfHasFiniteProducts.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finset/Slice.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Matrix/Cartan.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Laurent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/PullOut.lean,Mathlib/MeasureTheory/Integral/TorusIntegral.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/NumberTheory/Niven.lean,Mathlib/Probability/CondVar.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/RingTheory/Nilpotent/Exp.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/Whitespace.lean,Mathlib/Tactic/Ring/NamePolyVars.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Instances/Rat.lean,Mathlib/Util/Superscript.lean,MathlibTest/WhitespaceLinter.lean	67	5	['adomani', 'github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot']	nobody	115-64554 3 months ago	unknown	0-0 0 seconds
34371	grunweg author:grunweg	feat: module instance on ContMDiffMap	From fpvandoorn and my LeanCourse25. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry	117/0	Mathlib/Geometry/Manifold/Algebra/LieGroup.lean	1	2	['github-actions']	nobody	114-54664 3 months ago	114-58749 114 days ago	0-7 7 seconds
34219	or4nge19 author:or4nge19	feat(MeasureTheory/BorelSpace): measurability of annuli on (pseudo)(e)metric space	it assumes `OpensMeasurableSpace` original [file](https://github.com/fpvandoorn/carleson/blob/master/Carleson/ToMathlib/Annulus.lean) From the Carleson project. Co-authored-by: James Sundstrom [james.sundstrom@gmail.com](mailto:james.sundstrom@gmail.com) --- - [x] depends on: #34200 - [ ] depends on: #34202 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson blocked-by-other-PR t-measure-probability	534/0	Mathlib.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Annulus.lean,Mathlib/Topology/MetricSpace/Annulus.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	113-77629 3 months ago	117-45234 117 days ago	0-236 3 minutes
33132	BoltonBailey author:BoltonBailey	feat(Computability): Single-tape TM complexity	Currently, time complexity in mathlib is defined in terms of (a kind of) multi-tape Turing machine [Turing.FinTM2](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Computability/TMComputable.html#Turing.FinTM2). This (currently Draft) PR develops time complexity in terms of Single-Tape Turing Machines. There are a few reasons to do this: * Having definitions of time complexity for both single-tape and multi-tape TMs is a prerequisite to prove theorems relating these definitions of complexity (in particular, the theorem that the definition of polynomial time computability is equivalent between these notions). * The Multi-tape "TM2" definition seems to be based on "Wang B-Machines" ([wiki](https://en.wikipedia.org/wiki/Wang_B-machine)) which involves both a program of function labels, as well as a set of states. * I think it's a bit more common to see a simpler presentation of single-tape ([and multitape](https://en.wikipedia.org/wiki/Multitape_Turing_machine)) Turing machines which only provides a set of states. * It seems to me that the B-Machine-like definition makes it a bit complicated to make progress. For example, if I want to compose Turing Machines, then I have to be able to construct a new program and state set, which involves mapping the [Turing.TM2.Stmt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Computability/TuringMachine.html#Turing.TM2.Stmt) type to the sum type of the tapes. I have to do something similar for single-tape TMs, but the Stmt type is less complicated, so this is less involved. * If we want to continue on and define space complexity, it seems convenient to have only a single tape, so that we don't have to do lots of reasoning over summations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability WIP	1480/0	Mathlib/Computability/BinEncoding.lean,Mathlib/Computability/EncodingTo.lean,Mathlib/Computability/SingleTapeBinTMComputable.lean,Mathlib/Computability/SingleTapeTMComputable.lean	4	1	['github-actions']	nobody	113-33892 3 months ago	unknown	0-0 0 seconds
34155	zcyemi author:zcyemi	feat(Geometry/Euclidean/Triangle): add altitudeFoot lies strictly between endpoints for an obtuse angle	--- add `sbtw_orthogonalProjection_of_angle_ge_pi_div_two`	t-euclidean-geometry awaiting-author	93/0	Mathlib/Geometry/Euclidean/Triangle.lean	1	4	['github-actions', 'jsm28']	nobody	113-14367 3 months ago	113-19747 113 days ago	5-82220 5 days
31134	thorimur author:thorimur	chore: use `whenLinterActivated` in linters	Replaces boilerplate in linters with `whenLinterActivated` or `whenLinterOption` where possible. --- - [ ] depends on: #31133 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	79/102	Mathlib/Tactic/Linter/CommandRanges.lean,Mathlib/Tactic/Linter/DocPrime.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Linter/GlobalAttributeIn.lean,Mathlib/Tactic/Linter/HashCommandLinter.lean,Mathlib/Tactic/Linter/Header.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/MinImports.lean,Mathlib/Tactic/Linter/Multigoal.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/PPRoundtrip.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UpstreamableDecl.lean,Mathlib/Tactic/Linter/Whitespace.lean,Mathlib/Util/CountHeartbeats.lean,scripts/lint-style.lean	17	8	['github-actions', 'grunweg', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	112-67323 3 months ago	unknown	0-0 0 seconds
34186	faenuccio author:faenuccio	feat(GroupTheory/SpecificGroups/Cyclic): a quotient of a cyclic group is cyclic	Add the Normal instance for a subgroup of a cyclic group; and derive that every quotient of a cyclic group is cyclic, as an instance.	t-group-theory awaiting-author merge-conflict	8/0	Mathlib/GroupTheory/SpecificGroups/Cyclic.lean	1	9	['erdOne', 'faenuccio', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'tb65536']	tb65536 assignee:tb65536	112-54765 3 months ago	113-28148 113 days ago	4-69261 4 days
31836	hanwenzhu author:hanwenzhu	chore(MeasureTheory/IntervalIntegral): generalize fundamental theorem of calculus to `HasDerivWithinAt` instead of `HasDerivAt`	This PR generalizes `HasDerivAt` to `HasDerivWithinAt`, and `DifferentiableAt` to `DifferentiableOn`, for the fundamental theorem of calculus for interval integrals. I found this during trying to state a skeleton of a proof of a higher-dimensional Taylor's theorem. There, the correct assumption is something like `ContDiffOn n f [[a, b]]`, rather than `∀ x ∈ [[a, b]], ContDiffAt 𝕜 n f [[a, b]] x`, which traces back to this issue. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-measure-probability awaiting-author merge-conflict	143/51	Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/IntegrationByParts.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean	7	10	['github-actions', 'hanwenzhu', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	112-51117 3 months ago	172-59919 172 days ago	6-17192 6 days
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter tech debt blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	4	['github-actions', 'grunweg', 'urkud']	nobody	112-28593 3 months ago	733-29587 733 days ago	0-15256 4 hours
34472	ADedecker author:ADedecker	feat: characterize TVS asymptotics in terms of seminorms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	472/24	Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/LocallyConvex/Asymptotics.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Seminorm.lean	5	3	['eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	111-42929 3 months ago	unknown	0-0 0 seconds
29953	slashbade author:slashbade	feat: add reap for experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	40/3	Cache/IO.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,lake-manifest.json,lakefile.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	111-38771 3 months ago	unknown	0-0 0 seconds
33110	dagurtomas author:dagurtomas	feat(CategoryTheory): adjoint functor theorems for presentable categories	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory	214/5	Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Presentable/AdjointFunctorTheorems.lean	2	2	['github-actions', 'joelriou']	nobody	111-26198 3 months ago	150-23486 150 days ago	0-5 5 seconds
8608	eric-wieser author:eric-wieser	feat: multiplicativize `AddTorsor`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra please-adopt label:t-algebra$	268/199	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Tactic/ToAdditive.lean	4	2	['alreadydone']	nobody	111-15471 3 months ago	unknown	0-0 0 seconds
34273	gasparattila author:gasparattila	feat(Topology/Sets): finite sets are dense in `(Nonempty)Compacts`	--- - [x] depends on: #34266 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	182/0	Mathlib/Topology/Sets/VietorisTopology.lean	2	4	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'scholzhannah']	ADedecker assignee:ADedecker	110-55103 3 months ago	55-43045 55 days ago	55-44288 55 days
34278	gasparattila author:gasparattila	feat(Topology/Sets): connectedness of `NonemptyCompacts`	--- - [x] depends on: #34268 - [ ] depends on: #34273 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR merge-conflict	434/17	Mathlib/Topology/Sets/VietorisTopology.lean	4	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	110-54509 3 months ago	116-24263 116 days ago	0-1194 19 minutes
34280	gasparattila author:gasparattila	feat(Topology/Sets): local connectedness of `(Nonempty)Compacts`	--- - [ ] depends on: #34278 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR merge-conflict	493/17	Mathlib/Topology/Sets/VietorisTopology.lean	4	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	110-52247 3 months ago	116-24266 116 days ago	0-235 3 minutes
28017	eric-wieser author:eric-wieser	feat: generalize some opnorm lemmas to seminormed spaces	--- - [ ] depends on: #28014 - [ ] depends on: #28101 - [ ] depends on: #29120 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	60/24	Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean,Mathlib/Analysis/NormedSpace/Real.lean	2	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	110-31114 3 months ago	286-20370 286 days ago	0-1 1 second
31377	CoolRmal author:CoolRmal	feat: a series of smooth functions that converges (locally) uniformly is smooth	The main theorem is the proof that an infinite sum of $C^n$ functions on a one-dimensional domain which converges locally uniformly is $C^n$ and related results. This should be compared with [contDiff_tsum](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Calculus/SmoothSeries.html#contDiff_tsum) where the same result is proved for functions on an arbitrary domain but with a slightly stronger convergence assumption. The main motivation for this PR is the [#mathlib4 > Tychonov's Counterexample for the Heat Equation](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tychonov's.20Counterexample.20for.20the.20Heat.20Equation/with/547367912). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author merge-conflict	110/18	Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/Topology/Algebra/InfiniteSum/TsumUniformlyOn.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	5	20	['CoolRmal', 'github-actions', 'mathlib4-merge-conflict-bot', 'ocfnash', 'sgouezel']	ocfnash assignee:ocfnash	110-28344 3 months ago	171-45309 171 days ago	8-14942 8 days
26158	upobir author:upobir	feat(NumberTheory/Divisors): add int divisors	This PR continues the work from #25209. Original PR: https://github.com/leanprover-community/mathlib4/pull/25209	awaiting-author t-number-theory merge-conflict	101/2	Mathlib/NumberTheory/Divisors.lean	1	38	['MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'upobir']	mariainesdff assignee:mariainesdff	109-81067 3 months ago	287-52269 287 days ago	46-1067 46 days
32865	robertmaxton42 author:robertmaxton42	(WIP) Separation axioms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	4439/13	Mathlib.lean,Mathlib/CategoryTheory/LiftingProperties/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Order/BooleanAlgebra/Set.lean,Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Category/Lifting/Defs.lean,Mathlib/Topology/Category/Lifting/Separation.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Category/UProp.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousMap/Basic.lean,Mathlib/Topology/ContinuousMap/Constructions.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/UpperLowerSetTopology.lean,Mathlib/Topology/SeparatedMap.lean,Mathlib/Topology/Separation/GDelta.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UnitInterval.lean,Mathlib/Topology/UrysohnsLemma.lean,docs/references.bib	30	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	109-66464 3 months ago	unknown	0-0 0 seconds
33031	chiyunhsu author:chiyunhsu	feat(Combinatorics/Enumerative/Partition): add combinatorial proof of Euler's partition theorem	The new file EulerComb.lean contains the combinatorial proof of Euler's partition theorem. The analytic proof of the theorem and its generalization of Glaisher's Theorem has already been formalized in [Glaisher.lean](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean). The generalization of the combinatorial proof from this file to Glaisher's Theorem is within reach. --- Zulip discussion: [#mathlib4 > Glaisher’s Bijection on integer partitions](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Glaisher.E2.80.99s.20Bijection.20on.20integer.20partitions/with/570808111) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-zulip awaiting-author	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	7	['chiyunhsu', 'dagurtomas', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	109-51865 3 months ago	109-51865 109 days ago	42-21618 42 days
27835	edegeltje author:edegeltje	feat(Tactic): ring modulo a given characteristic	This PR extends the `ring` tactic with a new config argument `char` which will try to reduce all constant terms modulo the given characteristic. This allows `ring` to prove e.g. `(x + y)^3 = x^3 + y^3` in characteristic 3. This is a simpler and faster way to do so than what we had before: `repeat { ring; reduce_mod_char }` becomes `ring (config := { char := 3 })`. The first step is to split off the required `CharP` definitions, since `Mathlib.Algebra.CharP.Basic` already requires the `ring` tactic. To perform the reduction modulo the given characteristic, I implemented `reduceCast` which reduces a raw integer, and wrapped it in `reduceResult` that takes a `NormNum.Result` for easy use. We need to pass through quite a few parameters into `reduceResult` so maybe it's worth defining a structure, or reusing `Cache` for this. Then it's basically a case of replacing every place where `ring` constructs a numeral with a call to `reduceResult`. Limitations: * `ring` doesn't attempt to detect the characteristic by itself, you need to pass it in explicitly. Trying to infer a `CharP` instance at each point sounds quite expensive. * Since the support for `%` in `NormNum` only exists for integers, I implemented the reduction only when a `Ring` instance is available. It is still sound in the semiring case, just not complete. * We could optimize exponentiation in the specific case where the characteristic `p` is a prime that divides the exponent `n`: `(x + y)^n = x^n + y^n`. I'll leave that to future work. --- This used to be #10765 by Anne Baanen before the great forkening. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict large-import migrated-from-branch t-meta awaiting-author WIP	312/133	Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/Tactic/LinearCombination.lean,Mathlib/Tactic/Module.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/ring_compare.lean,MathlibTest/ring_mod_char.lean	10	14	['edegeltje', 'github-actions', 'joneugster', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	109-50511 3 months ago	278-18220 278 days ago	11-83928 11 days
33954	or4nge19 author:or4nge19	feat(CategoryTheory/Abelian): add Filtration API	Filtered objects in an abelian category (Deligne, Théorie de Hodge II, §1.1). inspired by a [message](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Proposal.3A.20Complexifications.20with.20a.20view.20towards.20Hodge.20theory/near/565511365) by Joel Riou Co-authored-by: Jonathan Washburn --- PR 1/4 Next PRs will cover Opposed filtrations (Deligne, Théorie de Hodge II, §1.2.1–§1.2.3). Induced filtrations on graded pieces (Deligne, Théorie de Hodge II, §1.2.1). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	356/0	Mathlib.lean,Mathlib/CategoryTheory/Filtration/Basic.lean,docs/references.bib	3	12	['dagurtomas', 'github-actions', 'joelriou', 'or4nge19']	nobody	109-41112 3 months ago	109-41273 109 days ago	3-29113 3 days
34092	staroperator author:staroperator	feat(SetTheory/ZFC): properties of `ZFSet.omega`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	77/10	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	31	['Komyyy', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	YaelDillies assignee:YaelDillies	109-35517 3 months ago	21-73649 21 days ago	99-2887 99 days
34575	urkud author:urkud	feat(Integral/Pi): add more convenience API	--- It's some old code I want to revive&merge. I'll change it from draft when it's ready for review. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	406/1	Mathlib/MeasureTheory/Integral/Pi.lean	1	1	['github-actions']	nobody	109-29554 3 months ago	109-50418 109 days ago	0-22 22 seconds
33817	FlAmmmmING author:FlAmmmmING	fix(Combinatorics/Enumerative/Schroder): fix the definition of `smallSchroder`	In the previous definition, the small Schröder numbers were defined as ```LaTeX s_0 = 1, s_1 = 1, s_2 = 1, s_3 = 3... ``` , which does not match the sequence listed in OEIS A006318. Moreover, this definition makes it difficult to correctly write the generating function for the small Schröder numbers. This PR fixes this issue. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics large-import awaiting-author	61/39	Mathlib/Combinatorics/Enumerative/Schroder.lean	1	20	['FlAmmmmING', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	109-13559 3 months ago	53-82580 53 days ago	74-53798 74 days
34130	FlAmmmmING author:FlAmmmmING	feat(Combinatorics/SimpleGraph/Acyclic): Add new theorem `isTree_iff_uniqueShortest_path`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	28/1	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['IvanRenison', 'github-actions', 'metakunt', 'vlad902']	nobody	108-74272 3 months ago	117-58287 117 days ago	2-6389 2 days
34487	martinwintermath author:martinwintermath	feat(LinearAlgebra/SesquilinearForm): add instances for SeparatingLeft, SeparatingRight and Nondegenerate	Add typeclass instances for `Fact B.SeparatingLeft`, `Fact B.SeparatingRight`, `Fact B.Nondegenerate`: * inferring `Fact B.flip.SeparatingLeft` from `Fact B.SeparatingRight` and vice versa * inferring `Fact B.SeparatingLeft` and `Fact B.SeparatingRight` from `Fact B.Nondegenerate` * inferring `Fact B.SeparatingLeft` and `Fact B.Nondegenerate` for `.id` and `Dual.eval` * inferring `Fact B.Nondegenerate` from `B.IsPerfPair` I also updated `PointedCone.dual_univ` to demonstrate the usefulness of these additions. Note that I needed to add an import to `Cone/Dual.lean` which somehow imports cardinals. So I needed to remove cardinals from `assert_not_exists`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor large-import merge-conflict label:t-algebra$	67/12	Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/PerfectPairing/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	2	4	['github-actions', 'martinwintermath', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	108-60926 3 months ago	49-47263 49 days ago	13-75766 13 days
32872	JovanGerb author:JovanGerb	feat(Data/Real/Basic): don't expose the definition of `Real`	This PR refactors the definition of `Real` using the module system, so that `Real` cannot be seen as a structure anymore. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	141/250	Archive/Imo/Imo2013Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Counterexamples/SeminormLatticeNotDistrib.lean,Counterexamples/TopologistsSineCurve.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Data/Real/Basic.lean,MathlibTest/Complex.lean,MathlibTest/Continuity.lean,MathlibTest/Quaternion.lean,MathlibTest/Real.lean	10	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	108-31807 3 months ago	155-61606 155 days ago	0-1695 28 minutes
34096	urkud author:urkud	chore(EMetric/*): rename theorems	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	789/737	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/IteratedDeriv/ConvergenceOnBall.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/TaylorSeries.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/InnerProductSpace/Projection/Minimal.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Bounded.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Module/Connected.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Metric.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/OpenPos.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/MetricSpace/Lipschitz.lean,Mathlib/Topology/Baire/CompleteMetrizable.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Diam.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/CantorScheme.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/MetricSpace/Contracting.lean,Mathlib/Topology/MetricSpace/Cover.lean,Mathlib/Topology/MetricSpace/Dilation.lean,Mathlib/Topology/MetricSpace/Gluing.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/MetricSpace/PartitionOfUnity.lean,Mathlib/Topology/MetricSpace/Perfect.lean,Mathlib/Topology/MetricSpace/Polish.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/MetricSpace/Snowflaking.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Real.lean	80	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	108-31556 3 months ago	unknown	0-0 0 seconds
26087	grunweg author:grunweg	feat: a `SliceModel` typeclass for models with corners for embedded submanifolds	We define a new typeclass to denote a model with corners which "embeds" into another one: there are an embedding of the underlying topological spaces and a continuous linear inclusion between the normed spaces, which are compatible with the maps given by the models with corners. This condition is used for defining smooth (immersed and embedded) submanifolds: for `M` to be a submanifold of `N`, to boot their models with corners should be slice models. This will be defined in a future PR. To prove this definition is workable, we construct many basic instances of slice models - each model with corners is one over itself - slice models are transitive - each model with corners I embeds into two products `I.prod J` and `J.prod I` - Euclidean n-half-space embeds into Euclidean n-space - a Euclidean n-quadrant embeds into Euclidean half-space (hence into Euclidean n-space) - if n\leq m, Euclidean n-space embeds into Euclidean m-space [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Infinite-dimensional.20manifolds/near/413117885) ----------- - [x] depends on: #26083 - [x] depends on: #26082 - [x] depends on: #26086 - [x] depends on: #25705 This PR continues the work from #25505.	t-differential-geometry	234/0	Mathlib.lean,Mathlib/Geometry/Manifold/SliceModel.lean	2	4	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	108-27390 3 months ago	328-36111 328 days ago	0-12097 3 hours
34028	floor-licker author:floor-licker	feat(SimpleGraph): add max-flow/min-cut weak duality	This PR introduces a basic s–t flow setup for undirected SimpleGraphs and proves the standard weak-duality inequality: for any feasible flow f and any s–t cut S, value f ≤ cutCapacity S. This is a small, self-contained lemma I extracted while working on larger graph-theoretic formalizations, in particular, results that will ultimately rely on a full max-flow/min-cut theorem. The full MFMC equality/existence statement is not included here. This is the weak-duality direction (∀ f S, value f ≤ cutCapacity S).	t-combinatorics new-contributor	169/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/MaxFlowMinCut.lean	2	14	['SnirBroshi', 'floor-licker', 'github-actions', 'mathlib-merge-conflicts']	kmill assignee:kmill	108-13566 3 months ago	59-37095 59 days ago	61-8543 61 days
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	29	['MrBrain295', 'Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	108-4858 3 months ago	318-3082 318 days ago	72-49525 72 days
25841	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Kővári–Sós–Turán theorem	Prove the Kővári–Sós–Turán theorem (an upper bound on the Zarankiewicz function) --- - [x] depends on: #19865 - [x] depends on: #20738 - [x] depends on: #27602 - [ ] depends on: #34633 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #20240. Original PR: https://github.com/leanprover-community/mathlib4/pull/20240	t-combinatorics blocked-by-other-PR	484/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,docs/1000.yaml	6	12	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner']	kmill assignee:kmill	108-4398 3 months ago	108-7561 108 days ago	37-76880 37 days
31582	ADedecker author:ADedecker	chore: more flavours of derivatives within the empty set	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-CI merge-conflict	33/11	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Const.lean	6	5	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	107-77121 3 months ago	unknown	0-0 0 seconds
34106	ADedecker author:ADedecker	feat: map a seminorm along a surjective linear map	--- - [x] depends on: #34105 - [x] depends on: #34104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	501/43	Mathlib/Algebra/Order/Group/Pointwise/Bounds.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/QuotientSeminorm.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/GaloisConnection/Basic.lean	6	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	107-43501 3 months ago	unknown	0-0 0 seconds
32609	PrParadoxy author:PrParadoxy	feat(LinearAlgebra/PiTensorProduct): Relation between nested tensor products and tensor products indexed by dependent sums	Product tensors in `⨂ j : (Σ i, β i), s j.fst j.snd` can be mapped to product tensors in `⨂ i, ⨂ b : β i, s i b`. If the outer index type is finite, the two types are equivalent. This allows the definition of endomorphisms on PiTensorProducts by specifying them on disjoint subsets of the index set. Such constructions are common e.g. in quantum circuits, quantum cellular automata, and renormalization procedures. --- WIP. This PR contains two "requests for comments". Essentially: * Is a single complex-to-define linear equivalence preferable over several less complex ones, which might however be of limited interest by themselves? * Which trade-offs are appropriate to make things computable? - [ ] depends on: #32608 - [x] depends on: #32600 - [x] depends on: #32598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-algebra label:t-algebra$	683/0	Mathlib.lean,Mathlib/Data/Sigma/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Nested.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	5	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	107-25677 3 months ago	161-26115 161 days ago	0-2004 33 minutes
29000	JovanGerb author:JovanGerb	feat(Tactic/Push): add basic tags and tests	This PR adds basic `@[push]` tags, and expands the `push` test file. --- - [ ] depends on: #21965 - [ ] depends on: #30038 - [ ] depends on: #30039 - [ ] depends on: #30042 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	290/196	Archive/Imo/Imo1988Q6.lean,Archive/ZagierTwoSquares.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/Matroid/Dual.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/PrimeFin.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/PartialSups.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Probability/Moments/ComplexMGF.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/Nilpotent/Defs.lean,Mathlib/Topology/Algebra/ProperAction/ProperlyDiscontinuous.lean,Mathlib/Topology/Bornology/BoundedOperation.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/ContinuousMap/BoundedCompactlySupported.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/JacobsonSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/HullKernel.lean,Mathlib/Topology/Perfect.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,MathlibTest/push.lean	87	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	107-24881 3 months ago	233-10466 233 days ago	0-10831 3 hours
27053	tb65536 author:tb65536	feat: Galois group of `x^n - x - 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra large-import merge-conflict label:t-algebra$	270/155	Archive/Wiedijk100Theorems/AbelRuffini.lean,Mathlib/RingTheory/Polynomial/Morse.lean,Mathlib/RingTheory/Polynomial/Selmer.lean	3	8	['AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	107-24860 3 months ago	310-16577 310 days ago	0-1 1 second
29792	robertmaxton42 author:robertmaxton42	feat(RelCWComplex): a (relative, concrete) CW complex is the colimit of its skeleta	Adds: * `RelCWComplex.Subcomplex.isCoherentWith_cover`: a (relative) CW complex is coherent with any collection of subcomplexes that cover. * `RelCWComplex.descBySkeletonLT` and `descBySkeleton`: construct a continuous map from a complex by providing a family of compatible maps from each skeleton and the base. `CWComplex.descBySkeleton` skips the base. - [ ] depends on: #29788 - [ ] depends on: #29790 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import t-topology	672/31	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	10	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'scholzhannah']	nobody	107-24754 3 months ago	242-14437 242 days ago	0-104 1 minute
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt t-topology t-algebra label:t-algebra$	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	107-24658 3 months ago	398-16261 398 days ago	0-954 15 minutes
34633	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define the Zarankiewicz function	Defines the Zarankiewicz function $z(m, n; s, t)$ in terms of bipartite graphs. --- - [x] depends on: #34632 This comes from splitting up #25841 into smaller PRs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge blocked-by-other-PR	247/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	4	30	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner']	nobody	107-3470 3 months ago	8-17059 8 days ago	53-35263 53 days
29411	llllvvuu author:llllvvuu	feat(LinearAlgebra/Matrix/Rank): rank factorization	The rank factorization derived from `Module.finBasis`. Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	20/0	Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean	2	3	['github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	106-64521 3 months ago	206-54224 206 days ago	46-58011 46 days
30260	imbrem author:imbrem	feat(CategoryTheory/Monoidal): added CocartesianMonoidalCategory	As discussed in #21603 and #28718; this implements chosen finite coproducts on top of `AddMonoidalCategory` as defined in #30150 --- - [ ] depends on: #30150 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import new-contributor t-category-theory	839/125	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Cocartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	5	4	['github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-64508 3 months ago	225-15077 225 days ago	0-1234 20 minutes
30258	imbrem author:imbrem	feat(CategoryTheory/Monoidal): to_additive for proofs using `monoidal`	Building on #30150, this allows us to use `@[to_additive]` on proofs containing `monoidal`, by tagging the lemmas `monoidal` outputs with `@[to_additive]` as appropriate. Testing on my branch [`additive-monoidal-coherence`](https://github.com/imbrem/mathlib4/tree/additive-monoidal-coherence) shows that this works. It is still future work to have either the `monoidal` tactic or a new `add_monoidal` tactic work for `AddMonoidalCategory` instances directly. --- - [ ] depends on: #30150 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR large-import new-contributor t-category-theory	524/140	Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-64501 3 months ago	225-20730 225 days ago	0-241 4 minutes
29790	robertmaxton42 author:robertmaxton42	feat(IsCoherentWith) : families of maps from a coherent collection of subspaces lift uniquely to maps from the total space	* Adds `IsCoherentWith.liftCover`, which lifts a compatible family of continuous maps from each member of a coherent set of subspaces to a single continuous map on the whole space. * Adds `IsCoherentWith.liftCover'`, which does the same but for a set of coherent subspaces given as the range of a function into `Set X` rather than as an explicit `Set (Set X).` - [ ] depends on: #29788 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-topology	350/3	Mathlib/Data/Set/Subset.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-64420 3 months ago	242-15097 242 days ago	0-119 1 minute
30253	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add a wrapper for iteratedFDeriv on the type of bundled smooth compactly supported maps	Add a wrapper for `iteratedFDeriv` and `fderiv` and on `D_K`, specializing the definitions for `D_K^n` for the case `n = \top` . Co-authored by: @ADedecker --- - [x] depends on: #30240 - [x] depends on: #30239 - [x] depends on: #30236 - [x] depends on: #30202 - [x] depends on: #30201 - [x] depends on: #30199 - [x] depends on: #30198 - [x] depends on: #30197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis blocked-by-other-PR	463/18	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean	1	5	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	106-64403 3 months ago	225-33350 225 days ago	0-599 9 minutes
32742	LTolDe author:LTolDe	feat(MeasureTheory/Constructions/Polish/Basic): add class SuslinSpace	add new class `SuslinSpace` for a topological space that is an analytic set in itself This will be useful to prove the Effros Theorem, see [zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/558712441). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-measure-probability awaiting-author	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	10	['ADedecker', 'LTolDe', 'dagurtomas', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	106-64275 3 months ago	132-48407 132 days ago	25-76907 25 days
33470	erdOne author:erdOne	feat: generalize `Polynomial.freeMonic`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra merge-conflict label:t-algebra$	80/52	Mathlib.lean,Mathlib/Algebra/Polynomial/FreeMonic.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean	3	3	['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	nobody	106-64150 3 months ago	116-27816 116 days ago	20-81395 20 days
30920	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	This is a migration of #25561 to a fork. --- - [x] depends on: #30132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory large-import merge-conflict	133/46	Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/ConcreteCategory/Bundled.lean	3	6	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	106-56340 3 months ago	204-72024 204 days ago	0-117 1 minute
30121	idontgetoutmuch author:idontgetoutmuch	feat(Mathlib/Geometry/Manifold): principal fiber bundle core	A structure capturing what it means to be a principal fibre bundle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	8	['github-actions', 'grunweg', 'idontgetoutmuch', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	106-56216 3 months ago	203-47662 203 days ago	25-16284 25 days
27918	kim-em author:kim-em	chore: refactor WithBot/WithTop as structures	For now we are still relying on `WithBot` and `WithTop` being defeq, but there is no impossible obstacle to converting them both to the same structure. This PR begins this effort; the modified files are all compiling, but there are more files that still have problems. Help on this (either ask to push to my branch, PR to my branch, or just adopt the whole thing!) very much appreciated.	file-removed merge-conflict WIP	971/361	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/ToMulBot.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Defs.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Finset/WithBot.lean,Mathlib/Data/Fintype/WithTopBot.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/Logic/Embedding/WithBot.lean,Mathlib/Logic/Equiv/WithBot.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Order/Category/BddLat.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Set/WithBotTop.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Set.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot/Basic.lean,Mathlib/Order/WithBot/BooleanAlgebra.lean,Mathlib/Order/WithBot/NAry.lean,Mathlib/RingTheory/OrderOfVanishing.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Instances/ENat.lean,MathlibTest/lift.lean	56	18	['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	106-55977 3 months ago	225-36020 225 days ago	18-9929 18 days
29605	alreadydone author:alreadydone	experiment(Algebra): unbundle npow/zpow from Monoid/InvDivMonoid	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI WIP label:t-algebra$	1527/1020	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Category/MonCat/ForgetCorepresentable.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Power.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Irreducible/Lemmas.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/NatPowAssoc.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/PUnit.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Group/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Conj.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/ULift.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/Lemmas.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Multiset.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	162	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-55826 3 months ago	248-32983 248 days ago	0-2 2 seconds
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter file-removed WIP	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	106-55809 3 months ago	347-67855 347 days ago	0-907 15 minutes
33991	grunweg author:grunweg	test: pretty-printing of class abbrev	Lake build fails with an error in batteries: what am I doing wrong? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed large-import WIP	118/303	.github/workflows/daily.yml,Mathlib.lean,Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Basic.lean,Mathlib/CategoryTheory/Limits/Yoneda.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Int/Cast/Pi.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/GetD.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Init.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/Lean/Meta/Simp.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/GaloisConnection/Defs.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Push/Attr.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Util/AssertExists.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/DirectoryDependencyLinter/Test.lean,MathlibTest/EmptyLine.lean,MathlibTest/ExtractGoal.lean,MathlibTest/HaveLetLinter.lean,MathlibTest/LibrarySearch/IsCompact.lean,MathlibTest/LintStyle.lean,MathlibTest/TacticAnalysis.lean,MathlibTest/UnusedInstancesInType.lean,MathlibTest/Util/PrintSorries.lean,MathlibTest/WhitespaceLinter.lean,MathlibTest/aesop_cat.lean,MathlibTest/eqns.lean,MathlibTest/fast_instance.lean,MathlibTest/globalAttributeIn.lean,MathlibTest/hintAll.lean,MathlibTest/jacobiSym.lean,MathlibTest/slim_check.lean,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain	61	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-55752 3 months ago	123-70437 123 days ago	0-111 1 minute
31110	bryangingechen author:bryangingechen	ci: don't delete merged branches	This will only affect PRs that are not from forks (e.g. this one). The motivation is that #30913 was closed automatically due to its target branch deleted after #30912 was merged. See also [#PR reviews > #30913 feat(Computability/Language):add subtraction notation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2330913.20feat.28Computability.2FLanguage.29.3Aadd.20subtraction.20notation/near/548052556). Looking at the history, it looks like this option hasn't been changed since we added bors to mathlib3: https://github.com/leanprover-community/mathlib3/pull/2322 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI merge-conflict	1/1	bors.toml	1	5	['bryangingechen', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	106-55496 3 months ago	199-37511 199 days ago	0-64677 17 hours
33707	jcommelin author:jcommelin	ci: add commit verification for transient and automated commits	This PR adds a CI workflow that verifies PRs correctly use transient and automated commits, and provides reviewers with a clear summary of which commits need human review. Commit types: - Substantive commits: Regular commits requiring human review - Automated commits (`x: `): CI verifies the commit is the exact result of running the command on the parent - Transient commits (`transient: ...`): CI verifies these have zero net effect on the final tree What this PR adds: - `scripts/verify_commits.sh` - Main verification script - `scripts/verify_commits_summary.sh` - Generates PR comment from JSON output - `.github/workflows/commit_verification.yml` - GitHub Actions workflow --- ### Testing locally The commit at `HEAD^` contains test branch creation scripts. These can be used for testing the functionality of the two shell scripts. To test: ```bash # Checkout the commit with test scripts git checkout HEAD^ # Create a test branch based on your current branch (before checkout) # Save your branch name first: BASE_BRANCH=$(git rev-parse --abbrev-ref HEAD) git checkout HEAD^ ./scripts/create_test_branch.sh $BASE_BRANCH # Run verification (should pass) ./scripts/verify_commits.sh $BASE_BRANCH ./scripts/verify_commits.sh $BASE_BRANCH --json \| ./scripts/verify_commits_summary.sh repo_foo 12345 # Clean up and return git checkout $BASE_BRANCH && git branch -D ci-x-test-* ``` Available test scripts: - `create_test_branch.sh` - Creates a branch with valid transient + auto commits (should pass) - `create_test_branch_fail_conflict.sh` - Transient commits cause cherry-pick conflicts (should fail) - `create_test_branch_fail_transient.sh` - Transient commits have net effect (should fail) - `create_test_branch_fail_auto.sh` - Auto commit doesn't match command output (should fail) 🤖 Generated with [Claude Code](https://claude.com/claude-code)	CI merge-conflict LLM-generated	685/0	.github/workflows/commit_verification.yml,scripts/verify_commits.sh,scripts/verify_commits_summary.sh	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-55491 3 months ago	131-10177 131 days ago	0-56518 15 hours
31102	JOSHCLUNE author:JOSHCLUNE	feat: require LeanHammer	Experimenting with adding LeanHammer as a mathlib dependency --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor t-meta	61/4	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/Hammer.lean,lake-manifest.json,lakefile.lean	5	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-54983 3 months ago	200-27122 200 days ago	0-6852 1 hour
33431	gululu996-ui author:gululu996-ui	feat(Combinatorics/SimpleGraph/Bipartite): characterize bipartite simple graphs by even cycles	Add the classical characterization of bipartite simple graphs: a simple graph is bipartite if and only if every cycle has even length. Previously, mathlib has the definition of `IsBipartite` for `SimpleGraph` and various lemmas about bipartite graphs, but it does not provide this equivalence in a single theorem, so users have to reprove or reassemble it from existing results. Prove the forward direction by showing a 2-coloring alternates along any walk, so every cycle must have even length. Prove the converse by showing that if an odd cycle exists then no bipartition is possible, hence if all cycles are even the graph admits a bipartition.	new-contributor t-combinatorics awaiting-author merge-conflict	186/1	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	6	['NickAdfor', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	kmill assignee:kmill	106-54715 3 months ago	108-55612 108 days ago	26-3983 26 days
34007	martinwintermath author:martinwintermath	feat(Algebra/Module/Submodule/Dual): dual operator for submodules	Add new file `Dual.lean` that defines the dual operator for submodules. The main definition is * `Submodule.dual`: given a bilinear pairing `p` between two modules `M₁` and `M₂` and a submodule `S` in `M₁`, `Submodule.dual p S` is the submodule in `M₂` consisting of all points `y` such that `0 = p x y` for all `x ∈ S`. For reasons of generality, `p` is actually a general sesqui-bilinear map, that is, of the form `p : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M`. This implementation of the `dual` operator for submodules is written to parallel the implementation of `PointedCone.dual`. Include some additional results: * theorems that represent the dual as the kernel of a linear map * theorems for the relation between dual and the `dualAnnihilator` and `dualCoannihilator` of a submodule. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	236/0	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Dual.lean	2	7	['github-actions', 'joelriou', 'martinwintermath', 'mathlib-bors']	joelriou assignee:joelriou	106-50752 3 months ago	108-33211 108 days ago	14-81283 14 days
34473	JovanGerb author:JovanGerb	feat: remove `Membership` instance for `SetLike`	This PR is an attempt to change the underlying expression of `x ∈ s` when `s` is not a `Set α`, but a `SetLike`, such as `Finset α` or `Subgroup α`. Instead of having a `Membership` instance, we use the membership instance on `Set α`, combined with the coercion to `Set α`. This has various benefits - There is now only one form instead of two to say the same thing. This saves us a lot of rewrites that will now become syntactic equalities. - It is not needed anymore to create a `mem_` lemma for every single `coe_` lemma in order to maintain simp confluence Unfortunately, doing this refactor is going to be a very big task, simply because so many proofs break as a result of `simp` now trying to simplify away the coercion where there was no coercion before. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	136/96	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Group/Pointwise/Set/BigOperators.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Erase.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/Preimage.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Order/Closure.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,MathlibTest/set_like.lean	40	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-26294 3 months ago	112-8079 112 days ago	0-8221 2 hours
34271	gasparattila author:gasparattila	feat(Topology/Sets): second-countability of `(Nonempty)Compacts`	--- - [x] depends on: #34266 - [x] depends on: #34268 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	308/93	Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sets/VietorisTopology.lean	5	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'scholzhannah']	urkud assignee:urkud	106-25008 3 months ago	10-29835 10 days ago	47-38731 47 days
34703	martinwintermath author:martinwintermath	Generalizing orthogonalBilin	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	49/25	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	3	1	['github-actions']	nobody	106-18255 3 months ago	unknown	0-0 0 seconds
34171	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Hasse): Define the Eulerian path of a path graph	--- Such statements are left for a future PR, since they add imports so we probably want to split them into a separate file: ```lean theorem IsEulerian.ofPathGraph : ofPathGraph n \|>.IsEulerian := by sorry theorem IsHamiltonian.ofPathGraph : ofPathGraph n \|>.IsHamiltonian := by sorry ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	37/1	Mathlib/Combinatorics/SimpleGraph/Hasse.lean	1	13	['SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp', 'vlad902']	YaelDillies assignee:YaelDillies	105-81415 3 months ago	54-51195 54 days ago	63-65372 63 days
34716	CoolRmal author:CoolRmal	feat: a right continuous strongly adapted process is progressively measurable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP brownian t-measure-probability merge-conflict	164/0	Mathlib/Probability/Process/Adapted.lean	1	3	['CoolRmal', 'github-actions', 'mathlib-merge-conflicts']	nobody	105-69470 3 months ago	105-69519 105 days ago	0-23 23 seconds
31008	RemyDegenne author:RemyDegenne	refactor: generalize the index of the process in the Doob decomposition	Generalize the index set for the Doob decomposition of an adapted process from Nat to a type with `LinearOrder`, `LocallyFiniteOrder`, `OrderBot`, `SuccOrder` (there is an order iso from that type to an interval of Nat). Motivation: to prove the Doob-Meyer decomposition we want to take a process indexed by [0,1] and consider sub-processes indexed by the dyadic points k*2^{-n} for a fixed n. We could use a process indexed by Nat, but we would have to invent values for k > 2^n while respecting the other properties of the process, and being able to index by the dyadics directly seems easier. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-measure-probability merge-conflict	341/192	Mathlib/Order/SuccPred/LinearLocallyFinite.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/Centering.lean,Mathlib/Probability/Martingale/OptionalStopping.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Process/Adapted.lean	7	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	105-68023 3 months ago	202-53340 202 days ago	0-2 2 seconds
30122	xroblot author:xroblot	Development branch (1)	Stickelberger ---	WIP large-import merge-conflict	4748/32	Mathlib.GaloisTower.lean,Mathlib/AddCharTrace.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Cyclotomic.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Duality.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/PrimeField.lean,Mathlib/GalCyclotomic.lean,Mathlib/GaussSum.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/KroneckerWeber_Blueprint.lean,Mathlib/Logic/Equiv/Set.lean,Mathlib/MWE.lean,Mathlib/Misc.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/Sandbox.lean,Mathlib/StickElt.lean,Mathlib/Teichmuller.lean	35	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	105-43772 3 months ago	228-64360 228 days ago	0-12 12 seconds
30620	plp127 author:plp127	feat: copy LE and LT on preorder and partial order	Adds `Preorder.copy` and `PartialOrder.copy` for replacing the le and lt with provably equal ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	22/0	Mathlib/Order/Defs/PartialOrder.lean	1	7	['Vierkantor', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	Vierkantor assignee:Vierkantor	104-33253 3 months ago	174-64593 174 days ago	31-54617 31 days
34000	grunweg author:grunweg	chore: golf using fun_prop [foo] syntax	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	14/8	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/InformationTheory/KullbackLeibler/KLFun.lean,MathlibTest/fun_prop_dev.lean	6	6	['Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	104-33244 3 months ago	123-56928 123 days ago	0-1 1 second
34291	YellPika author:YellPika	feat(Data): a monad for partial computations	This is the code corresponding to [mathlib4 > A monad for partial computations](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20monad.20for.20partial.20computations/with/569619800). Not currently intended to be merged. This PR depends on #33941. The only changes relevant to this discussion are in `OmegaPart.lean`, `OmegaProp.lean`, and `Quot.lean`. # Original Message Inspired by @Aaron Liu's comments in #mathlib4>deprecate Mathlib.Data.Nat.PartENat?@538009243 and #Is there code for X?>Divergence monad@538020049 I made an attempt at constructing a monad for partial computations with a computable `OmegaCompletePartialOrder` instance (neither `Option` nor `Part` support this use case). My solution consists of three parts. A computable version of `Quotient.choice`. As mentioned in #lean4>Quot.lift for dependent products@467436416 , the "obvious" computational interpretation of `Quotient.choice : (∀i:I, @Quotient (A i) …) → @Quotient (∀i:I, A i)` is not sound. However, we _can_ provide a sound computational interpretation when we restrict `I` to `ℕ`: ```lean unsafe def Quotient.countableChoice_impl {α : Nat → Type} {S : ∀ i, Setoid (α i)} (f : ∀ i, Quotient (S i)) : @Quotient (∀ i, α i) (by infer_instance) := Quotient.lift₂ (fun z s ↦ ⟦fun \| .zero => z \| .succ n => s n⟧) (fun z₁ s₁ z₂ s₂ h₁ h₂ ↦ by apply sound rintro ⟨_\|n⟩ · apply h₁ · apply h₂) (f 0) (countableChoice_impl (fun n ↦ f n.succ)) @[implemented_by Quotient.countableChoice_impl] def Quotient.countableChoice {α : Nat → Type} {S : ∀ i, Setoid (α i)} (f : ∀ i, Quotient (S i)) : @Quotient (∀ i, α i) (by infer_instance) := Quotient.choice f ``` My justification for the soundness of this implementation comes from the fact that only uses existing (sound and computable) functions + general recursion. The implementation is found [here](https://github.com/YellPika/mathlib4/blob/99d38f164a97c7aa225283ef6016f0279419a994/Mathlib/Data/Quot.lean#L430) (it uses `unquot` instead of recursion for performance reasons, but should be equivalent). A type of semi-computable propositions. Next, I define a type of semi-computable propositions `ΩProp` as a quotient of the type of boolean sequences `(ℕ → Bool) / ≈`, where `p ≈ q ≝ (∃n, p n) ↔ (∃n, q n)`. A sequence is interpreted as "true" if at least one element in the sequence is `true`, and the quotient relation ensures that we cannot observe the difference between different "true" sequences. The `ΩProp` type has a (computable) `OmegaCompletePartialOrder`, and `Quotient.countableChoice` is used in the implementation of `ωSup`. The implementation of this type is [here](https://github.com/YellPika/mathlib4/blob/quot-choice-compute/Mathlib/Data/OmegaProp.lean). A type of semi-computable computations. Finally, I define the type `ΩPart A` of semi-computable computations returning a value of type `A`. The definition of `ΩPart` is the same as `Part` with `ΩProp` swapped for `Prop`. Again, `ΩPart A` has a (computable) `OmegaCompletePartialOrder` instance. The implementation can be found [here](https://github.com/YellPika/mathlib4/blob/quot-choice-compute/Mathlib/Data/OmegaPart.lean). This was mainly just a fun experiment and the code is not ready to be (or perhaps should not be) put in mathlib. I thought I should post it here to see if 1) there is any interest or 2) an implementation already exists that has escaped my notice.	new-contributor large-import merge-conflict	1157/40	Mathlib/Data/OmegaPart.lean,Mathlib/Data/OmegaProp.lean,Mathlib/Data/Quot.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/ScottContinuity.lean	5	2	['github-actions', 'mathlib-merge-conflicts']	nobody	104-33236 3 months ago	unknown	0-0 0 seconds
34202	or4nge19 author:or4nge19	feat(Topology/MetricSpace): annuli in (pseudo)(e)metric spaces	From the Carleson project. Co-authored-by: James Sundstrom --- - [x] depends on: #34200 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	carleson t-topology awaiting-author	288/0	Mathlib.lean,Mathlib/Topology/MetricSpace/Annulus.lean	2	23	['MichaelStollBayreuth', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'or4nge19']	nobody	104-26743 3 months ago	104-26743 104 days ago	10-6519 10 days
34053	christian-oudard author:christian-oudard	feat: Add error function (erf) and complementary error function (erfc)	## Summary I was doing some finance math and needed the Error Function, so I thought I'd contribute it. ### Main definitions * `Real.erf`: The error function, defined as `(2/√π) ∫₀ˣ e^(-t²) dt` * `Real.erfc`: The complementary error function, defined as `1 - erf x` ### Main results * `Real.erf_zero`: `erf 0 = 0` * `Real.erf_neg`: `erf` is an odd function: `erf (-x) = -erf x` * `Real.erf_tendsto_one`: `erf x → 1` as `x → ∞` * `Real.erf_tendsto_neg_one`: `erf x → -1` as `x → -∞` * `Real.erf_le_one`: `erf x ≤ 1` for all `x` * `Real.neg_one_le_erf`: `-1 ≤ erf x` for all `x` * `Real.deriv_erf`: `deriv erf x = (2/√π) * exp(-x²)` * `Real.differentiable_erf`: `erf` is differentiable * `Real.continuous_erf`: `erf` is continuous * `Real.strictMono_erf`: `erf` is strictly monotone Also adds `erf` to `docs/overview.yaml` under Special Functions. --- - [x] Builds successfully - [x] `lake exe runLinter` passes - [x] `lake exe mk_all --check` passes	t-analysis new-contributor awaiting-author	333/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Erf.lean,docs/overview.yaml	3	18	['SnirBroshi', 'christian-oudard', 'github-actions', 'j-loreaux', 'plp127']	j-loreaux assignee:j-loreaux	104-6012 3 months ago	104-42865 104 days ago	14-69133 14 days
33601	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): Concatenation of CFGs is CFG	--- - [ ] depends on: #33599 - [ ] depends on: #33592 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor blocked-by-other-PR	941/0	Mathlib/Computability/ContextFreeGrammar.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	103-70125 3 months ago	133-53988 133 days ago	0-412 6 minutes
33080	sinhp author:sinhp	feat(Category Theory): Cartesian Natural Transformation	This PR defines cartesian natural transformations between functors and proves they are closed under horizontal and vertical composition. Also we prove the following results: - `NatTrans.isCartesian_of_discrete` shows that any natural transformation between functors from a discrete category is cartesian. - `NatTrans.isCartesian_of_isIso` shows that any natural isomorphism is cartesian. - `NatTrans.isIso_of_isCartesian_of_isIso_app_terminal` shows that a cartesian natural transformation is an isomorphism if its component at a terminal object is an isomorphism. - `NatTrans.isCartesian_of_isPullback_isTerminal_from` shows that a natural transformation is cartesian if all its naturality squares to the terminal object are pullback squares. This material is adapted from the polynomial functors project developed during the Trimester "Prospects of Formal Mathematics" at the Hausdorff Institute (HIM) in Bonn: https://github.com/sinhp/Poly Co-authored-by: Wojciech Nawrocki --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	145/0	Mathlib.lean,Mathlib/CategoryTheory/NatTransCartesian.lean	2	8	['dagurtomas', 'github-actions', 'joelriou', 'robin-carlier', 'sinhp']	nobody	102-72815 3 months ago	138-44445 138 days ago	3-19675 3 days
34397	Parcly-Taxel author:Parcly-Taxel	feat: integral representation of the AGM	--- - [x] depends on: #32892	t-analysis awaiting-author	294/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Integrals/ArithmeticGeometricMean.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot', 'sgouezel']	sgouezel assignee:sgouezel	102-64152 3 months ago	102-64152 102 days ago	7-50633 7 days
34018	CoolRmal author:CoolRmal	feat: series representation of cosecant	This PR adds 1. Some trignometric identities. 2. `tprod_pnat_odd_mul_even`, which is an invariant of [tprod_even_mul_odd](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Algebra/InfiniteSum/NatInt.html#tprod_even_mul_odd) 3. a series representation of `fun z => π / sin (π * z)`. An outline of the proof can be found in the PNT project: https://alexkontorovich.github.io/PrimeNumberTheoremAnd/blueprint/zeta-chapter.html#lem:abadeuleulmit1 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	140/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean	4	12	['CBirkbeck', 'CoolRmal', 'erdOne', 'github-actions', 'loefflerd']	kex-y assignee:kex-y	102-55112 3 months ago	102-55112 102 days ago	20-27591 20 days
34726	GrigorenkoPV author:GrigorenkoPV	feat(Analysis/SpecialFunctions/Trigonometric/Basic): sin and cos of multiples of π / 3	--- Merge of https://github.com/leanprover-community/mathlib4/pull/26349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	159/0	Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,MathlibTest/trigonometry.lean	4	1	['github-actions']	nobody	102-29150 3 months ago	102-29150 102 days ago	3-20994 3 days
34892	kim-em author:kim-em	experiment: by claude		LLM-generated	88/0	claude.md	1	1	['github-actions']	nobody	102-22321 3 months ago	unknown	0-0 0 seconds
29788	robertmaxton42 author:robertmaxton42	feat(Topology): adds bundled continuous maps for sum, sigma, subtype, mapsto, inclusion	Adds a collection of bundled continuous maps and homeomorphisms, and helper lemmas for working with their compositions. Bundling of existing continuity lemmas: * `ContinuousMap.subtypeVal` * `ContinuousMap.inl` and `.inr`; `ContinuousMap.sum` bundles `Continuous.sumElim`; `ContinuousMap.sumMap`, which is a quotient map when both components are quotient maps * `ContinuousMap.sigmaMap`, which is a quotient map when given a family of quotient maps * `ContinuousMap.mapsTo` bundles `ContinuousOn.restrict_mapsTo` New functions: * `ContinuousMap.preimageValIncl : C(s ↓∩ t, t)` and `.inclPreimageVal C(s, t ↓∩ s)`, and their unbundled functions in `Set` * `Homeomorph.Set.preimageVal` witnesses that the two are opposite directions of a homeomorphism * Descending from a coherent set of subspaces is a quotient map The primary use for these bundled maps is easy composition and the ability to introduce them by rewriting right-to-left: it is much more convenient to write `subtypeVal.comp _` than to use either the anonymous constructor (which doesn't work in any position without an expected type) or `ContinuousMap.mk` (which will disappear as soon as it is coerced to a function, making it difficult to use in mixed-categorical contexts where many maps can only be reduced by introducing a composition with some other map.) This PR is part of a family of PRs that ultimately construct transformations in both directions between the concrete `Topology.RelCWComplex` and abstract `TopCat.RelativeCWComplex`. `.mapsTo` in particular bundles together a couple of potentially nontrivial proofs in a way that makes them easy to refer to later; I use it and `.subtypeVal` particularly heavily later in a dependent PR to build the cell inclusion maps on both sides of the equivalence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology awaiting-author	227/2	Mathlib/Data/Set/Subset.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Coherent.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Basic.lean,scripts/noshake.json	7	17	['adamtopaz', 'dagurtomas', 'github-actions', 'mathlib4-merge-conflict-bot', 'robertmaxton42']	adamtopaz assignee:adamtopaz	101-74124 3 months ago	102-45114 102 days ago	85-42529 85 days
31361	alreadydone author:alreadydone	feat(Algebra/Order): convex subgroups	--- - [x] depends on: #32886 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order awaiting-author label:t-algebra$	422/0	Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Group/Convex.lean,Mathlib/Algebra/Order/Group/Height.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/Quotient.lean	5	46	['Vierkantor', 'YaelDillies', 'alreadydone', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele']	YaelDillies assignee:YaelDillies	101-64200 3 months ago	32-40840 32 days ago	28-36362 28 days
34394	Citronhat author:Citronhat	feat(Algebra/Order/Ring): add constructors for linear ordered rings	Add constructors for ordered rings from `mul_nonneg` / `mul_pos` that derive `ZeroLEOneClass` from a linear order.	new-contributor t-algebra awaiting-author label:t-algebra$	31/14	Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/RingTheory/HahnSeries/Lex.lean	2	6	['Citronhat', 'Vierkantor', 'github-actions', 'leanprover-radar']	Vierkantor assignee:Vierkantor	101-62487 3 months ago	101-62487 101 days ago	12-25418 12 days
26884	alreadydone author:alreadydone	Universal cover	TODO: construct locally constant predicate from a functor from the fundamental groupoid of a loc path connected, semilocally simply connected space to Type, and the associated covering space (as an etale space) --- - [x] depends on: #24983 - [x] depends on: #22771 - [ ] depends on: #31925 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-topology blocked-by-other-PR merge-conflict	900/165	Mathlib.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	11	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	101-22434 3 months ago	unknown	0-0 0 seconds
31925	alreadydone author:alreadydone	feat(Topology): étalé space associated to a predicate on sections	Zulip: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2322782.20Etale.20space/near/527381645 --- - [ ] depends on: #33795 migrated from #22782 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR merge-conflict	900/165	Mathlib.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	11	16	['adamtopaz', 'alreadydone', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	101-21402 3 months ago	129-44580 129 days ago	26-56538 26 days
34956	kbuzzard author:kbuzzard	test: add a file with universe tests	Just to keep track of some horrible universe issues in Kaehler.Polynomial. This shouldn't be a PR, I just wanted a way of keeping track of the mess that universe normalisation in core causes in alg geom. If core moves on universe normalization then this file hopefully provides a useful test. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory WIP	266/0	Mathlib/RingTheory/Kaehler/UniverseTest.lean	1	1	['github-actions']	nobody	100-31804 3 months ago	45-54845 45 days ago	54-63437 54 days
33493	michelsol author:michelsol	feat(RingTheory/Polynomial): An explicit formula for the Chebyshev polynomials of the first kind	Adds the following explicit formula on the Chebyshev polynomial of the first kind of order n. ${ T_{n}(x)\ =\ \sum \limits _{k=0}^{\lfloor {\frac {n}{2}}\rfloor } {\binom {n}{2k}} \left(\ X^{2}-1\ \right)^{k}\ X^{n-2k}}$ This explicit formula can be found [here](https://en.wikipedia.org/wiki/Chebyshev_polynomials#Explicit_expressions). There is a proof using complex numbers but it only works if the ring R = ℂ. The proof here is by induction and works in a commutative ring R. Mathlib seems to extend the definition of Chebyshev polynomials for $n \in \mathbb{Z}$ but this would make the formula more cumbersome with `n.natAbs` in place of `n`'s, so I expressed it on `n : ℕ` directly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	51/1	Mathlib/RingTheory/Polynomial/Chebyshev.lean	1	8	['YuvalFilmus', 'erdOne', 'github-actions', 'metakunt', 'michelsol']	chrisflav assignee:chrisflav	100-12326 3 months ago	100-12326 100 days ago	35-16105 35 days
28468	alreadydone author:alreadydone	feat(Algebra): ring API for `AddLocalization`	Extract `Submonoid.IsLocalizationMap` from `LocalizationMap` and use it in `IsLocalization`. Develop basic API for AddLocalization at a two-sided ideal; in the case of the top AddSubmonoid, show the localization has a Ring structure (Grothendieck ring). Show that a nontrivial commutative semiring with cancellative addition satisfies the strong rank condition. (This will eventually be replaced by Yi-Jia Tan's result which shows cancellative addition is unnecessary, so it's also reasonable to leave this part out of this PR.) --- - [x] depends on: #27842 - [x] depends on: #27862 - [x] depends on: #29596 - [x] depends on: #29597 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import t-ring-theory awaiting-author label:t-algebra$	676/6	Mathlib.lean,Mathlib/GroupTheory/MonoidLocalization/Archimedean.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Localization/Additive.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/StrongRankCondition.lean	8	12	['alreadydone', 'chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	100-8038 3 months ago	100-8038 100 days ago	23-7335 23 days
30658	grunweg author:grunweg	feat: extend the `whitespace` linter to proof bodies	--- - [x] depends on: #30663 - [x] depends on: #30685 - [x] depends on: #30687 - [x] depends on: #30688 - [x] depends on: #30689 - [x] depends on: #30691 - [x] depends on: #30723 - [x] depends on: #30724 - [x] depends on: #30725 - [x] depends on: leanprover/lean4#11780 - [x] depends on: leanprover/lean4#12006 - [ ] depends on: leanprover/lean4#11686 - [x] depends on: #33705 - [x] depends on: #33706 - [x] depends on: #33716 - [x] depends on: #33234 - [x] depends on: #33342 - [x] depends on: #33708 - [x] depends on: #33758 - [x] depends on: #33759 - [x] depends on: #33789 - [x] depends on: #33815 - [x] depends on: #33816 - [x] depends on: #35909 - [x] depends on: #37993 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict blocked-by-other-PR	2006/452	Archive/Imo/Imo2010Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/HeawoodUnitDistance.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Module/TransferInstance.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nonempty.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/OfHasFiniteProducts.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Data/DFinsupp/Notation.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finset/Slice.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Matrix/Cartan.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Laurent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/PullOut.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/TrapezoidalRule.lean,Mathlib/MeasureTheory/Integral/TorusIntegral.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/NumberTheory/Niven.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/RepresentationTheory/Coinduced.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/FormalGroup/Basic.lean,Mathlib/RingTheory/Nilpotent/Exp.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/Whitespace.lean,Mathlib/Tactic/Ring/NamePolyVars.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Util/Superscript.lean,MathlibTest/WhitespaceLinter.lean	82	68	['SnirBroshi', 'adomani', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	100-7109 3 months ago	35-22767 35 days ago	0-34802 9 hours
34897	kim-em author:kim-em	experiment: Claude defining reductive groups	This PR adds preliminary definitions for reductive algebraic groups, following Borel's definition over general fields. ## Status: Experimental Sketch This is scaffolding with known mathematical issues. See `Mathlib/Algebra/AlgebraicGroup/PLAN.md` for a detailed roadmap of what's needed for correct definitions. ### What's Here \| Definition \| Status \| Notes \| \|------------\|--------\|-------\| \| `AffineAlgGroup k A` \| OK \| Smooth affine group scheme of finite type \| \| `AlgPoints k A` \| Partial \| Correct type, Group instance is `sorry` \| \| `NoNontrivialIdempotents` \| OK \| For connectedness \| \| `IsUnipotent` \| Wrong \| Vacuous in reduced rings (see below) \| \| `unipotentRadical` \| Wrong \| Should be Hopf ideal, not Subgroup \| \| `ReductiveGroup` \| Placeholder \| Uses `True` pending dependencies \| ### Known Mathematical Issues 1. `IsUnipotent` is vacuous: Definition checks nilpotence in reduced ring A, so only g=1 satisfies it. Correct definition requires comodule theory. 2. Need functor of points, not just k-points: Should define `A →ₐ[k] R` for all k-algebras R, not just `A →ₐ[k] k`. 3. `unipotentRadical` should be a Hopf ideal: Closed subgroup schemes correspond to Hopf ideals, not subgroups of points. 4. Geometric notions missing: Unipotent/connected/reductive should be defined after base change to k̄. ### Roadmap (see PLAN.md) 1. Functor of points: Group structure on R-points via convolution 2. Hopf ideals: For closed subgroup schemes 3. Geometric infrastructure: Base change, geometric connectedness 4. Comodule theory: For correct `IsUnipotent` 5. Unipotent radical: As Hopf ideal (very hard - SGA3/Borel level) Alternative: Define "linearly reductive" via complete reducibility (simpler, equivalent in char 0). ## References - Brian Conrad, "Reductive Group Schemes" - Armand Borel, "Linear Algebraic Groups" - SGA3, Exposé XIX 🤖 Prepared with Claude Code	t-algebra LLM-generated merge-conflict label:t-algebra$	753/0	Mathlib.lean,Mathlib/Algebra/AlgebraicGroup/Defs.lean,Mathlib/Algebra/AlgebraicGroup/PLAN.md,Mathlib/Algebra/AlgebraicGroup/Reductive.lean,Mathlib/Algebra/AlgebraicGroup/Unipotent.lean	5	2	['github-actions', 'mathlib-merge-conflicts']	nobody	99-83696 3 months ago	unknown	0-0 0 seconds
34815	Deep0Thinking author:Deep0Thinking	feat(Analysis/SpecialFunctions/ImproperIntegrals): Frullani integral	- [x] depends on: #34966 --- Add a proof of Frullani integral. Main theorems: - `Frullani.integral_Ioi` - `IntegrableOn.tendsto_integral_Ioi` - `exists_integral_div_eq_mul_log` Supporting lemmas: - `Frullani.comp_mul_left_div` - `Frullani.intervalIntegrable_div` - `Frullani.exists_integral_div_eq_mul_log` - `Ioi_diff_Ioc` - `ContinuousOn.comp_mul_left_div`, `ContinuousOn.comp_mul_right_div` - `ContinuousOn.comp_mul_left`, `ContinuousOn.comp_mul_right` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import t-analysis awaiting-author blocked-by-other-PR	270/2	Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Monoid.lean	6	17	['CoolRmal', 'Deep0Thinking', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'sgouezel']	urkud assignee:urkud	99-82441 3 months ago	23-32491 23 days ago	11-36072 11 days
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [x] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	516/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt	7	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	98-68712 3 months ago	318-5553 318 days ago	52-59768 52 days
27664	pechersky author:pechersky	feat(Topology,Analysis): discrete topology metric space and normed groups	Explicit construction of the discrete topology metric space and normed groups where `dist x y = 1` for all `x != y` Provide PseudoMetricSpace, MetricSpace, Seminormed(Add)Group, and Normed(Add)Group constructions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-topology merge-conflict	124/0	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Constructions.lean	3	14	['github-actions', 'kckennylau', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'pechersky', 'plp127']	urkud assignee:urkud	98-40435 3 months ago	178-50276 178 days ago	114-32890 114 days
14501	jjaassoonn author:jjaassoonn	feat: module structure of filtered colimit of abelian groups over filtered colimit of rings	This helps defining the module structure of stalks This contribution was inspired by the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #15315 [I am going to move the result in the new file] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra workshop-AIM-AG-2024 t-category-theory merge-conflict awaiting-author label:t-algebra$	439/2	Mathlib/CategoryTheory/Limits/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean	2	49	['YaelDillies', 'adamtopaz', 'alreadydone', 'erdOne', 'github-actions', 'jjaassoonn', 'joelriou', 'kbuzzard']	joelriou assignee:joelriou	97-61293 3 months ago	538-49561 538 days ago	64-30806 64 days
26986	WangYiran01 author:WangYiran01	feat(Partition): add bijection for partitions with max part ≤ r	This PR adds a new theorem `partition_max_equals_bound` to `Mathlib.Combinatorics.Enumerative.Partition`. It constructs a bijection between: - The set of partitions of `n` in which `r ∈ π.parts` and all parts are `≤ r`, and - The set of partitions of `n - r` whose largest part is at most `r`. This provides a constructive proof via removing/adding `r` from/to the partition multiset, in line with classical enumerative combinatorics. Contributed by Yiran Wang.	awaiting-author t-combinatorics new-contributor merge-conflict	92/0	Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Data/Multiset/Lattice.lean	2	20	['WangYiran01', 'github-actions', 'jcommelin', 'kckennylau', 'kim-em', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	97-47200 3 months ago	130-70068 130 days ago	120-67067 120 days
25035	ScottCarnahan author:ScottCarnahan	feat(Algebra/Module/Equiv/Defs): linear equivalence between linear hom and semilinear hom	Given a ring homomorphism `σ₂ : R →+* R₂`, an `R`-module `M`, and a module `M₂` for both `R` and `R₂` satisfying `SMulCommClass R R₂ M₂` and `(σ₂ r) • x = r • x`, we produce an `R₂`-linear equivalence between `M →ₗ[R] M₂` and `M →ₛₗ[σ₂] M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra merge-conflict label:t-algebra$	21/0	Mathlib/Algebra/Module/Equiv/Defs.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	97-28191 3 months ago	343-78149 343 days ago	20-7584 20 days
26168	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition	Add `signedMeasure_totalVariation_eq`: if `μ` is a `SignedMeasure` then variation defined as a supremum is equal to variation defined using the Hahn-Jordan decomposition. Co-authored-by: @yoh-tanimoto --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author merge-conflict blocked-by-other-PR new-contributor	916/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Jordan.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean	5	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'yoh-tanimoto']	nobody	97-28189 3 months ago	317-70456 317 days ago	15-65390 15 days
34722	GrigorenkoPV author:GrigorenkoPV	feat(Data/Finset/RangeDistance): bound distance between elements of `Finset.range`	--- Rebase of https://github.com/leanprover-community/mathlib4/pull/26347 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-data awaiting-author	34/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	7	['GrigorenkoPV', 'Vierkantor', 'github-actions', 'joneugster', 'mathlib-splicebot', 'plp127']	pechersky assignee:pechersky	97-13478 3 months ago	53-37240 53 days ago	52-18954 52 days
35114	CoolRmal author:CoolRmal	feat: Kirszbraun’s theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	144/0	Mathlib/Analysis/Kirszbraun.lean	1	1	['github-actions']	nobody	97-564 3 months ago	unknown	0-0 0 seconds
27702	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Lambda-squared sieves and prove important properties	This PR continues the work from #22052. Original PR: https://github.com/leanprover-community/mathlib4/pull/22052 - [x] depends on: #27820	t-number-theory delegated merge-conflict	186/7	Mathlib/NumberTheory/SelbergSieve.lean	1	44	['FLDutchmann', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	96-80019 3 months ago	158-76064 158 days ago	15-82750 15 days
28693	faenuccio author:faenuccio	feat(Analysis.Normed.Module.Milman-Pettis): add Milman-Pettis theorem	We add the Milman-Pettis theorem stating that an uniformly convex Banach space is reflexive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict	279/0	Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/Milman-Pettis.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean	4	9	['ADedecker', 'faenuccio', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'yhx-12243']	nobody	96-79893 3 months ago	271-55395 271 days ago	0-1 1 second
31141	peabrainiac author:peabrainiac	feat(Analysis/Calculus): parametric integrals over smooth functions are smooth	Show that for any smooth function `f : H × ℝ → E`, the parametric integral `fun x ↦ ∫ t in a..b, f (x, t) ∂μ` is smooth too. The argument proceeds inductively, using the fact that derivatives of parametric integrals can themselves be computed as parametric integrals. The necessary lemmas on derivatives of parametric integrals already existed, but took some work to apply due to their generality; we state some convenient special cases. --- - [x] depends on: #31077 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author maintainer-merge	470/12	Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/Separation/Regular.lean	5	36	['fpvandoorn', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac', 'sgouezel']	j-loreaux assignee:j-loreaux	96-62631 3 months ago	96-62631 96 days ago	33-85043 33 days
29499	chrisflav author:chrisflav	feat(CategoryTheory/Sites): sheafification via hypercovers	This is very much WIP, but I need a fresh cache. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	1944/4	Mathlib.lean,Mathlib/CategoryTheory/Sites/HomotopyOneHypercover.lean,Mathlib/CategoryTheory/Sites/Hypercover/Homotopy.lean,Mathlib/CategoryTheory/Sites/Hypercover/One.lean,Mathlib/CategoryTheory/Sites/Hypercover/Refinement.lean,Mathlib/CategoryTheory/Sites/Hypercover/Sheafification.lean,Mathlib/CategoryTheory/Sites/Hypercover/Zero.lean	7	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	96-31680 3 months ago	unknown	0-0 0 seconds
33969	goliath-klein author:goliath-klein	refactor(PiTensorProduct/{InjectiveNorm, ProjectiveNorm}): Currently, injectiveSeminorm = projectiveSeminorm	WIP / RFC! Arguably, `injectiveSeminorm` should be re-defined in Mathlib. See #34137 and [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/injectiveSeminorm/with/568798261) for context. In this file, we collect some results about the current definition and a possible alternative. Contents: * A theorem `injectiveSeminorm_eq_projectiveSeminorm` formalizing the equality of the current definitions. However, I think it is unlikely that keeping the alternative characterization would be worth the effort. The interesting direction `(L2') ≤ (L1)` follows from `norm_eval_le_projectiveSeminorm` which is still present. The converse direction is [somewhat tautological](https://github.com/leanprover-community/mathlib4/pull/34137). A proof of `(L2) = (L1)` (probably requiring Hahn-Banach) might be more interesting. * A preliminary implementation of the injective seminorm as commonly understood. * Sufficient conditions for the multiplicativity property `‖⨂ m i‖_∧ = ∏ ‖m i‖` to hold. This implements a TBD item. --- Co-authored-by: Davood H. H. Tehrani [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor large-import merge-conflict	774/387	Mathlib.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/LeastReasonable.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean	8	3	['github-actions', 'goliath-klein', 'mathlib-merge-conflicts']	nobody	96-30550 3 months ago	124-45654 124 days ago	0-23 23 seconds
34248	erdOne author:erdOne	chore: get rid of `LocalizedModule.mk`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra merge-conflict label:t-algebra$	64/65	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/GroupTheory/DivisibleHull.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Module.lean	6	3	['Vierkantor', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	96-30421 3 months ago	116-62299 116 days ago	0-15155 4 hours
27307	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	In this PR, we defined the concept of a homogeneous relation and proved some properties about homogeneous relations. The main result of this PR is showing that taking `RingQuot` by a homogeneous relation can give a graded structure on the quotient ring. This result can be used to define graded structures on rings obtained using `RingQuot`, e.g. the Symmetric Algebra defined in #21539 can be verified to have such a structure. Co-authored-by: Zhixuan Dai @atstarrysky <22300180006@m.fudan.edu.cn> Yiming Fu @pelicanhere Zhenyan Fu @pumpkin678 Raphael Douglas Giles @Raph-DG Jiedong Jiang @jjdishere This PR continues the work from #22279. Original PR: https://github.com/leanprover-community/mathlib4/pull/22279	awaiting-author t-ring-theory	394/1	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousRelation.lean	10	46	['AntoineChambert-Loir', 'alreadydone', 'chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'ocfnash', 'xyzw12345']	mattrobball assignee:mattrobball	96-29491 3 months ago	184-41400 184 days ago	117-42266 117 days
34939	erdOne author:erdOne	chore(AlgebraicGeometry): use relative gluing in `IdealSheaf`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict	174/381	Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/AlgebraicGeometry/Sites/SmallAffineZariski.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	96-21695 3 months ago	96-21696 96 days ago	4-64009 4 days
33821	JohnnyTeutonic author:JohnnyTeutonic	feat(LinearAlgebra/Matrix/Hermitian): add IsSkewHermitian predicate	Adds `IsSkewHermitian` predicate for matrices satisfying Aᴴ = -A. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	70/0	Mathlib/LinearAlgebra/Matrix/Hermitian.lean	1	20	['JohnnyTeutonic', 'github-actions', 'j-loreaux', 'themathqueen']	kim-em assignee:kim-em	96-17398 3 months ago	96-33435 96 days ago	26-62209 26 days
33233	jazzits author:jazzits	feat(GroupTheory): add chosen group presentations and Tietze transformations (1) and (2)	Defines a notion of group presentation for G compatible with Mathlib.GroupTheory.PresentedGroup: generators `ι → G` whose range generates G, and relators `rels : Set (FreeGroup ι)` whose normal closure equals the kernel of `FreeGroup ι →* G`. Provides the canonical map `PresentedGroup P.rels →* G` and equivalences showing `PresentedGroup P.rels ≃* G` and invariance under changing presentations. Also formalizes Tietze moves (1)–(2) as equivalences of PresentedGroups: adding/removing a relator that lies in the normal closure of the others. TODO: moves (3)–(4) (add/remove generator with a defining relation). No existing definitions are modified	t-group-theory new-contributor awaiting-author	328/0	Mathlib.lean,Mathlib/GroupTheory/Presentation.lean	2	15	['github-actions', 'homeowmorphism', 'jazzits', 'kbuzzard', 'mathlib-merge-conflicts', 'plp127', 'tb65536']	tb65536 assignee:tb65536	95-59083 3 months ago	140-51630 140 days ago	5-47944 5 days
34931	eric-wieser author:eric-wieser	perf: make TensorProduct.lift irreducible with a unification hint	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	6/2	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	7	['eric-wieser', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	erdOne assignee:erdOne	95-36732 3 months ago	95-36733 95 days ago	5-66655 5 days
34725	GrigorenkoPV author:GrigorenkoPV	feat(RingTheory/RootsOfUnity/LowDegree): quadratic, cubic, quartic, quintic roots of unity	Closes https://github.com/leanprover-community/mathlib4/pull/25907 --- Merge of https://github.com/leanprover-community/mathlib4/pull/25907 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory awaiting-author	247/0	Mathlib.lean,Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/RingTheory/RootsOfUnity/LowDegree.lean	4	22	['GrigorenkoPV', 'LLaurance', 'erdOne', 'github-actions', 'joneugster']	nobody	95-23773 3 months ago	100-13093 100 days ago	5-38408 5 days
33032	ksenono author:ksenono	feat(Combinatorics/SimpleGraph): Konig’s theorem on bipartite graphs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor blocked-by-other-PR merge-conflict	832/251	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Konig/Auxillary.lean,Mathlib/Combinatorics/SimpleGraph/Konig/Konig.lean,Mathlib/Combinatorics/SimpleGraph/Konig/KonigFin.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/VertexCover.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean	12	9	['SnirBroshi', 'github-actions', 'ksenono', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	95-7683 3 months ago	151-76739 151 days ago	0-136 2 minutes
35241	ooovi author:ooovi	chore(LinearAlgebra/AffineSpace): Redefine AffineSpace	Definition of `AffineSpace` following that of `ConvexSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	106/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Basic.lean	2	1	['github-actions']	nobody	94-63248 3 months ago	unknown	0-0 0 seconds
34159	wangying11123 author:wangying11123	feat(Geometry/Euclidean/Similarity): Add Triangle similarity on oangle	Add theorems about triangles similarity on oangle	t-euclidean-geometry new-contributor awaiting-author	154/1	Mathlib/Geometry/Euclidean/Similarity.lean	1	8	['LLaurance', 'github-actions', 'jsm28', 'wangying11123']	jsm28 assignee:jsm28	94-57850 3 months ago	95-18679 95 days ago	7-49555 7 days
34799	vlad902 author:vlad902	feat(SimpleGraph): the cycle graph and complete graph are Hamiltonian	--- - [ ] depends on: #34797 - [ ] depends on: #35255 - [ ] depends on: #37930 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics large-import blocked-by-other-PR merge-conflict	29/0	Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean	2	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	94-52259 3 months ago	104-31927 104 days ago	0-551 9 minutes
35125	kim-em author:kim-em	chore: make OrderDual a structure	This PR changes `OrderDual` from a type alias (`def OrderDual (α : Type) := α`) to a one-field structure: ```lean structure OrderDual (α : Type) where toDual :: ofDual : α ``` This prevents defeq abuse between `α` and `αᵒᵈ`, requiring explicit `toDual`/`ofDual` wrapping at type boundaries. 🤖 Prepared with Claude Code	WIP large-import merge-conflict LLM-generated	10540/4872	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MvPolynomial/NoZeroDivisors.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Group/Action/Synonym.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Group/Pointwise/Bounds.lean,Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Action/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Synonym.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Algebra/Order/Module/Pointwise.lean,Mathlib/Algebra/Order/Module/Synonym.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Cast.lean,Mathlib/Algebra/Order/Ring/Synonym.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/UpperLower.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/CategoryTheory/Abelian/Subobject.lean,Mathlib/CategoryTheory/Localization/Bousfield.lean,Mathlib/CategoryTheory/MorphismProperty/LiftingProperty.lean,Mathlib/CategoryTheory/Subobject/ArtinianObject.lean,Mathlib/CategoryTheory/Subobject/Limits.lean,Mathlib/Combinatorics/Enumerative/IncidenceAlgebra.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Pi.lean,Mathlib/Data/Finset/Lattice/Prod.lean,Mathlib/Data/Finset/Lattice/Union.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/PiInduction.lean,Mathlib/Data/Finset/Sigma.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/WellFounded.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Defs.lean,Mathlib/Data/Fintype/Lattice.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Nat/Cast/Synonym.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Pairing.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Finite/Lemmas.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Monotone.lean,Mathlib/Data/Set/Piecewise.lean,Mathlib/Data/Set/Sigma.lean,Mathlib/Data/Sum/Order.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/LinearAlgebra/AffineSpace/Ordered.lean	324	2	['github-actions', 'mathlib-merge-conflicts']	nobody	94-46525 3 months ago	unknown	0-0 0 seconds
34702	pfaffelh author:pfaffelh	feat(Data/FinsetPowerset): The set `{v : List.Vector Bool n \| v.val.count = k}` has cardinality `n.choose k`	Show that `{v : List.Vector Bool n \| v.val.count = k}` has cardinality `n.choose k`. The proof builds on `powersetCard k s` (the subsets of `s : Finset _` with cardinality `k`), and an equivalence to the above set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data awaiting-author	52/1	Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Fintype/Pi.lean,Mathlib/Logic/Equiv/Fintype.lean	3	37	['DavidLedvinka', 'Vierkantor', 'b-mehta', 'eric-wieser', 'github-actions', 'joneugster', 'pfaffelh']	Vierkantor assignee:Vierkantor	94-13650 3 months ago	11-72563 11 days ago	93-37493 93 days
33050	mkaratarakis author:mkaratarakis	feat: lemmas for the analytic part of the proof of the Gelfond–Schneider theorem	Lemmas missing for the formalisation of the proof of the Gelfond–Schneider theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor WIP	238/0	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/NumberTheory/Transcendental/AnalyticPart.lean,Mathlib/NumberTheory/Transcendental/AnalyticPart2.lean	6	113	['SnirBroshi', 'github-actions', 'j-loreaux', 'mkaratarakis', 'riccardobrasca', 'vihdzp']	riccardobrasca assignee:riccardobrasca	93-40230 3 months ago	103-59487 103 days ago	6-26337 6 days
34814	GrigorenkoPV author:GrigorenkoPV	feat(Tactic/ClearUnneeded): add `clear_unneeded` tactic	--- The simplest version suggested in https://github.com/leanprover-community/mathlib4/issues/25319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta new-contributor please-merge-master awaiting-author	94/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ClearUnneeded.lean,Mathlib/Tactic/Common.lean,MathlibTest/ClearUnneeded.lean,scripts/noshake.json	6	12	['BoltonBailey', 'GrigorenkoPV', 'github-actions', 'joneugster']	joneugster assignee:joneugster	93-27294 3 months ago	101-50667 101 days ago	2-23785 2 days
34876	GrigorenkoPV author:GrigorenkoPV	feat(Tactic/AssumptionQuestion): add `assumption?` tactic	--- As requested in #10361 TODO: maybe add some tests? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta new-contributor awaiting-author	85/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/AssumptionQuestion.lean,Mathlib/Tactic/Common.lean,MathlibTest/AssumptionQuestion.lean,scripts/noshake.json	6	5	['GrigorenkoPV', 'SnirBroshi', 'github-actions', 'joneugster']	joneugster assignee:joneugster	93-25869 3 months ago	101-48857 101 days ago	0-83167 23 hours
31386	harahu author:harahu	doc: demote repeated H1 headers to H2	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	220/4	Archive/Imo/Imo2002Q3.lean,Archive/Imo/Imo2010Q5.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/RingTheory/LocalProperties/Injective.lean,Mathlib/RingTheory/LocalProperties/ProjectiveDimension.lean,Mathlib/RingTheory/QuasiFinite/Weakly.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/DirectoryDependencyLinter/Test.lean,MathlibTest/Header.lean,scripts/demote_docstring_headers.py,scripts/find_docstring_headers.py	6	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	93-24701 3 months ago	unknown	0-0 0 seconds
33217	Blackfeather007 author:Blackfeather007	feat(Algebra): define associated graded structure for abelian group	In this PR we define the associated graded structure for abelian group when given a filtration and only give some basic lemmas about it. --- migrated from https://github.com/leanprover-community/mathlib4/pull/26857	new-contributor t-ring-theory awaiting-author	144/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	13	['Blackfeather007', 'chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'urkud']	erdOne assignee:erdOne	93-13450 3 months ago	142-27846 142 days ago	4-58698 4 days
33020	FormulaRabbit81 author:FormulaRabbit81	chore(Topology): Deprecate file	--- - [x] depends on: #30851 deprecation [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import merge-conflict	82/49	Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/PiNat.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	93-13343 3 months ago	152-732 152 days ago	0-14835 4 hours
23791	SEU-Prime author:SEU-Prime	Create AmiceTrans.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-number-theory new-contributor	2963/0	Mathlib.lean,Mathlib/Analysis/Normed/Ring/Lemmas2.lean,Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PSAC.lean,Mathlib/NumberTheory/Padics/PSAC2.lean,Mathlib/NumberTheory/Padics/PSAC3.lean,Mathlib/NumberTheory/Padics/PiGammainPS.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean,Mathlib/RingTheory/AdicCompletion/Lemma.lean,Mathlib/RingTheory/PowerSeries/Comp.lean,Mathlib/Topology/ContinuousMap/ZeroAtBot.lean	11	5	['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	93-12514 3 months ago	406-45180 406 days ago	0-38 38 seconds
20967	joneugster author:joneugster	tracking(CategoryTheory/Enriched/Limits): add conical limits	Tracking PR for adding conical limits Co-authored-by: Emily Riehl Co-authored-by: Dagur Asgeirsson --- - [x] depends on: #20904 - [x] depends on: #20907 - [x] depends on: #20959 - [x] depends on: #20963 - [x] depends on: #20964 - [x] depends on: #20965 - content source: emilyriehl/infinity-cosmos#78 New implementation (not reflected on this branch yet): - [x] depends on: #22917 - [x] depends on: #22921 - [ ] depends on: #22923 - [ ] depends on: #22924 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory infinity-cosmos please-adopt	619/1	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalProducts.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalPullbacks.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalTerminal.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalLimit.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalTerminal.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	93-5422 3 months ago	unknown	0-0 0 seconds
23042	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add HasConicalLimitsOfSize.shrink	--- Note: I've marked this "WIP" because I'm not yet sure when this will be needed and I'd probably put the PR on the queue once I've created some follow-up needing it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory infinity-cosmos please-adopt	22/1	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	1	['github-actions']	nobody	93-5421 3 months ago	426-68321 426 days ago	0-1 1 second
23142	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add API for HasConicalLimit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-category-theory infinity-cosmos please-adopt	52/9	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	2	['github-actions', 'joelriou']	nobody	93-5421 3 months ago	423-71312 423 days ago	0-67788 18 hours
23145	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add IsConicalLimits	--- - [ ] depends on: #23142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory infinity-cosmos please-adopt	221/9	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalLimit.lean	3	3	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	93-5420 3 months ago	424-52422 424 days ago	0-370 6 minutes
20401	RemyDegenne author:RemyDegenne	feat: add sigmaFinite_iUnion	```lean lemma sigmaFinite_iUnion (μ : Measure α) {s : ℕ → Set α} (h_meas : MeasurableSet (⋃ n, s n)) [∀ n, SigmaFinite (μ.restrict (s n))] : SigmaFinite (μ.restrict (⋃ n, s n)) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	37/28	Mathlib/MeasureTheory/Decomposition/Exhaustion.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean	2	6	['RemyDegenne', 'github-actions', 'sgouezel', 'urkud']	nobody	92-74892 3 months ago	500-62408 500 days ago	0-73190 20 hours
33281	michelsol author:michelsol	feat(Analysis/SpecialFunctions/Integrals): integral of 1/sqrt(1-x^2) and its integrability.	Add the integral of the derivative of arcsin and its integrability. --- - [ ] depends on: #33280 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict t-analysis	59/0	Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	92-68537 3 months ago	144-36362 144 days ago	0-2872 47 minutes
35339	grunweg author:grunweg	feat: "confusing variables" linter	Continuation of #15400. This linter flags variable commands which both update an existing binder annotation and declare new variables: these can yield confusing or misleading error messages (see https://github.com/leanprover/lean4/issues/2789). Instead, these should be split in several variable statements. ------------ Help fixing these errors is welcome! Currently, the linter only catches some cases, when the updated binder is from a previous scope. To make it catch all cases, the linter could insert a section before the variable command and use that scope instead. See [zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Get.20scope.20before.20some.20syntax.20is.20evaluated) [discussions](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Determining.20variable.20binders.20from.20syntax). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict awaiting-CI t-linter	220/9	Cache/Requests.lean,Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/Style.lean,MathlibTest/LintStyle.lean	8	0	[]	nobody	92-62191 3 months ago	92-62259 92 days ago	0-12 12 seconds
35342	grunweg author:grunweg	feat: add Diffeomorph.sumSumSumComm	This matches `{Equiv,Homeomorph.sumSumSumComm}`, and is needed to prove that addition in the cobordism group is commutative. From my bordism theory project. ---------- Migrated and rebased version of #22784. The current proof is not complete yet, and feels very painful. Medium-term, the best way forward might be to make fun_prop support manifolds. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry	50/0	Mathlib/Geometry/Manifold/Diffeomorph.lean	1	1	['github-actions']	nobody	92-60335 3 months ago	92-60406 92 days ago	0-1 1 second
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	16	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll', 'urkud']	nobody	92-52279 3 months ago	741-51479 741 days ago	46-5571 46 days
20428	madvorak author:madvorak	feat(Data/Sign): lemmas about `∈ Set.range SignType.cast`	--- Perhaps `in_set_range_singType_cast_iff_abs` needs to be moved somewhere downstream.	merge-conflict WIP t-data	40/0	Mathlib/Data/Sign.lean	1	13	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'urkud']	nobody	92-52107 3 months ago	unknown	0-0 0 seconds
29281	plp127 author:plp127	doc: `Fin.natAdd_castLEEmb`	Change the docstring of `Fin.natAdd_castLEEmb` which confused me when I read it so I rewrote it. PS. this doesn't really follow the naming convention since data should be in `camelCase` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data awaiting-author	2/3	Mathlib/Data/Fin/Embedding.lean	1	3	['github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	92-48728 3 months ago	239-57196 239 days ago	18-38918 18 days
34165	zcyemi author:zcyemi	feat(Archive/Imo/Imo2012Q5): IMO 2012 Q5	--- Add IMO 2012 Q5 - [ ] depends on: #34157 - [ ] depends on: #34156 - [ ] depends on: #34155 - [ ] depends on: #33852 - [ ] depends on: #33479 - [ ] depends on: #31500	blocked-by-other-PR large-import IMO merge-conflict	965/12	Archive.lean,Archive/Imo/Imo2012Q5.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Sphere/Basic.lean,Mathlib/Geometry/Euclidean/Sphere/Power.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	8	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	92-45691 3 months ago	118-75355 118 days ago	0-1530 25 minutes
27936	alreadydone author:alreadydone	feat(Algebra): additivize Dvd and Prime	`Prime` can't be directly additivized, so we introduce `Prime₀`, which drops the `≠ 0` condition, and additivize it to `AddPrime`. To show that `Prime₀` is a reasonable definition, we show its connection to `Irreducible` under `IsPrimal` and `IsRegular` conditions. We also show that an element in a product monoid is `Prime₀` iff one component is a unit and the other is `Prime₀`, and the same with `Prime₀` replaced by `Irreducible`. Also additivize `IsPrimal`, `IsRelPrime` and `DecompositionMonoid`. The motivation is that the primality of `single g 1` in `AddMonoidAlgebra k G` is connected to the primality of `g` in `G`. --- I've checked [all 29 files](https://github.com/search?q=repo%3Aleanprover-community%2Fmathlib4%20%E2%88%A3%20to_additive&type=code) containing the `∣` symbol and the `to_additive` attribute and fixed the wrongly translated (`dvd` to `addDvd`) names. TODO: connect (Add)Dvd to [ExistsMul/AddOfLE](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.html#ExistsMulOfLE) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	398/185	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Finite.lean,Mathlib/Algebra/Divisibility/Hom.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Prime/Prod.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/GroupTheory/Coset/Card.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/Period.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Tactic/Translate/ToAdditive.lean	30	38	['JovanGerb', 'YaelDillies', 'adomani', 'alreadydone', 'bryangingechen', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	92-45438 3 months ago	116-51298 116 days ago	107-17045 107 days
34156	zcyemi author:zcyemi	feat(Analysis/Convex/Between): add lemmas on convex combination of mem simplex interior	--- I add three lemmas of convex combinations preserving membership in the interior of a simplex. And also open a zulip thread [#mathlib4 > Best place for convex combination and simplex interior](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Best.20place.20for.20convex.20combination.20and.20simplex.20interior/with/568558406) deps: - [ ] depends on: #33852	t-analysis merge-conflict	170/0	Mathlib/Analysis/Convex/Between.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	92-44454 3 months ago	92-44454 92 days ago	0-3761 1 hour
34503	alreadydone author:alreadydone	chore(RingTheory/Localization): generalize FractionRing to semirings	+ Introduce `Submonoid.regulars`, the submonoid of regular elements in a monoid. + Replace `nonZeroDivisors` by `regulars` in the definition of (Is)FractionRing, generalizing from CommRing to CommSemiring. Finishes most of the remaining parts of issue #22997. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra awaiting-CI WIP merge-conflict label:t-algebra$	330/188	Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Ring/NonZeroDivisors.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/LocalRing/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/FractionRing.lean	13	2	['github-actions', 'mathlib-merge-conflicts']	nobody	92-44329 3 months ago	unknown	0-0 0 seconds
35134	fpvandoorn author:fpvandoorn	feat(translate): print constant names with hover info	Part of #34846. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict	46/28	Mathlib/Tactic/Translate/Core.lean,MathlibTest/toAdditive.lean	2	6	['JovanGerb', 'github-actions', 'mathlib-merge-conflicts']	JovanGerb assignee:JovanGerb	92-44199 3 months ago	94-36655 94 days ago	2-13760 2 days
29777	yuanyi-350 author:yuanyi-350	feat(Functional Analysis): closed Range Theorem	- [ ] depends on: #29151 [Corollary of Hahn-Banach theorem] - [ ] depends on: #29776 [refactor ContinuousLinearMap.isOpenMap by separating it into sublemmas] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR new-contributor awaiting-author t-analysis merge-conflict	237/25	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ClosedRange.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	5	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	faenuccio assignee:faenuccio	92-37722 3 months ago	242-49498 242 days ago	0-634 10 minutes
29151	yuanyi-350 author:yuanyi-350	feat: Corollary of Hahn–Banach theorem	In this PR, I have proved [Rudin, Functional Analysis (Theorem 3.7)][rudin1991] which is a step in proving the Closed Range Theorem. Also, I have added tags for the corresponding theorems in Rudin to mathlib. 3.7 Theorem. Suppose B is a convex, balanced, closed set in a locally convex space $X, x_0 \in X$, but $x_0 \notin B$. Then there exists $\Lambda \in X^$ such that $\|\Lambda x\| \leq 1$ for all $x \in B$, but $\Lambda x_0>1$ proof. Since $B$ is closed and convex, we can apply (b) of Theorem 3.4, with $A=\{ x_0 \}$ , to obtain $\Lambda_1 \in X^$ such that $\Lambda_1 x_0=r e^{i \theta}$ lies outside the closure $K$ of $\Lambda_1(B)$. Since $B$ is balanced, so is $K$. Hence there exists $s, 0 List.Vector.* - ... Deletions: - Nat.bit1_add_bit1 - ... Any other comments you want to keep out of the PR commit should go below the `---`, and placed outside this HTML comment, or else they will be invisible to reviewers. If this PR depends on other PRs, please list them below this comment, using the following format: - [ ] depends on: #xyz [optional extra text] --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author new-contributor large-import t-analysis merge-conflict	70/1	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	17	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	92-33345 3 months ago	239-67173 239 days ago	20-68757 20 days
35341	grunweg author:grunweg	feat: lint against the tactic.skipAssignedInstances option in mathlib	This means we can remove the corresponding technical debt entry. Re-created version of #20872. --- [This comment](https://github.com/leanprover-community/mathlib4/pull/20872#issuecomment-2602743770) might still be relevant: does this linter need adaptations to recursively parse the outer `set_option`s? Wasn't there code written semi-recently which did this? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-linter merge-conflict	54/3	Mathlib/Tactic/Linter/Style.lean,MathlibTest/LintStyle.lean	2	3	['github-actions', 'mathlib-merge-conflicts']	nobody	92-31990 3 months ago	92-60626 92 days ago	0-118 1 minute
35344	grunweg author:grunweg	feat: lint upon uses of the mono tactic	suggesting to use `gcongr` instead. In general, `mono` is unmaintained, was only partially ported --- and gcongr at this point is more featureful, actively developed and has a nicer user interface. The topic was also discussed [on zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Porting.20note.3A.20Fixing.20up.20.60mono.60/with/445125798). --- TODO: update the linter wording, fix its implementation and wait until tests pass Rebased and migrated version of #25700. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-linter RFC	4/0	MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/Monotonicity.lean	2	2	['github-actions', 'grunweg']	nobody	92-31610 3 months ago	92-58726 92 days ago	0-13 13 seconds
29965	RemyDegenne author:RemyDegenne	feat(probability): define subtraction of kernels	This PR defines subtraction of kernels and uses it to prove `MeasurableSet {a \| κ a = η a}` for two finite kernels `κ, η`. From the LeanBandits project. --- - [x] depends on: #35018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-measure-probability large-import	165/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/SubFinite.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/RadonNikodym.lean,Mathlib/Probability/Kernel/Sub.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	92-28996 3 months ago	235-71481 235 days ago	0-1 1 second
32534	erdOne author:erdOne	feat(AlgebraicGeometry): Zariski's main theorem	--- - [x] depends on: #34274 - [x] depends on: #34017 - [ ] depends on: #34222 - [ ] depends on: #34269 - [ ] depends on: #33903 - [ ] depends on: #33803 - [ ] depends on: #33555 - [x] depends on: #33805 - [x] depends on: #33722 - [x] depends on: #33718 - [x] depends on: #32811 - [x] depends on: #32803 - [x] depends on: #33469 - [x] depends on: #33553 - [x] depends on: #32530 - [x] depends on: #32528 - [x] depends on: #32429 - [x] depends on: #32375 - [x] depends on: #30885 - [x] depends on: #32536 - [x] depends on: #32537 - [x] depends on: #32595 - [x] depends on: #32596 - [x] depends on: #32813 - [x] depends on: #32809 - [x] depends on: #32802 - [x] depends on: #33468 - [x] depends on: #32665 - [x] depends on: #32823 - [x] depends on: #32806 - [x] depends on: #32837 - [x] depends on: #33537 - [x] depends on: #33476 - [x] depends on: #33556 - [x] depends on: #33536 - [x] depends on: #33472 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory	4808/0	Mathlib.lean,Mathlib/CFT/ActualStuff.lean,Mathlib/CFT/Etale.lean,Mathlib/CFT/EtaleLocalization.lean,Mathlib/CFT/Flat.lean,Mathlib/CFT/IntegralClosure.lean,Mathlib/CFT/IsStandardEtale.lean,Mathlib/CFT/Junk.lean,Mathlib/CFT/NewNo.lean,Mathlib/CFT/No.lean,Mathlib/CFT/Nonsense.lean,Mathlib/CFT/Normalization.lean,Mathlib/CFT/Prestuff.lean,Mathlib/CFT/SeparableResidueStruct.lean,Mathlib/CFT/Smooth.lean,Mathlib/CFT/SmoothFibers.lean,Mathlib/CFT/Stuff.lean,Mathlib/CFT/Stuff2.lean,Mathlib/CFT/ZariskiMain.lean,Mathlib/RingTheory/ZariskiMain.lean	20	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	91-62626 3 months ago	162-59206 162 days ago	0-101 1 minute
32918	michelsol author:michelsol	feat: define `supEdist` and `supDist`	Create a new file Topology.MetricSpace.SupDistance and define the supremal distance in (extended) metric spaces. The defined `supEdist` and `supDist` will have similar theory to the already existing `infEdist` and `infDist`. The motivation is to be able to define the radius of a minimal bounding sphere as the infimum of the supDist later. [zulip discussion here](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Formalizing.20Jung's.20theorem.20and.20minimal.20bounding.20spheres)	t-topology new-contributor merge-conflict	75/0	Mathlib.lean,Mathlib/Topology/MetricSpace/SupDistance.lean	2	5	['github-actions', 'mathlib4-merge-conflict-bot', 'michelsol', 'urkud']	nobody	91-38636 3 months ago	133-31021 133 days ago	21-3598 21 days
34909	SnirBroshi author:SnirBroshi	feat(Data/Sym/Sym2): `fromRel` equivalence with `Sigma` over a `Quotient`	Add a non-dependent recursor on members of a `fromRel` set, and the following `Equiv`s: - The `fromRel` set of a symmetric relation `r` is equivalent to summing that set restricted to fibers of `f`. - For a relation homomorphism `r →r r'` where `r` is symmetric, the `fromRel` set of `r` is equivalent to summing that set restricted to equivalence classes of `r'` using a `Subtype`. --- I find this recursor pretty useful when dealing with `fromRel`, the idea came from a suggestion by @kmill [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Eq.2Erec.20with.20a.20constant.20does.20nothing.3A.20h.20.E2.96.B8.20c.20.3D.20c/near/565176948) for another `Sym2` conundrum. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	43/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Data/Sym/Sym2.lean	1	15	['SnirBroshi', 'chrisflav', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	eric-wieser assignee:eric-wieser	91-33452 3 months ago	18-80775 18 days ago	82-35003 82 days
29145	JovanGerb author:JovanGerb	chore: use `to_additive` in more places	This PR addresses some comments about `to_additive` not working, by making it work more. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict	61/177	Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean,Mathlib/Combinatorics/Additive/DoublingConst.lean,Mathlib/Data/ZMod/Aut.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean	5	4	['JovanGerb', 'github-actions', 'mathlib-merge-conflicts']	nobody	91-32533 3 months ago	261-22204 261 days ago	0-26083 7 hours
34024	adomani author:adomani	feat: the global syntax linter	The `globalSyntax` linter emits a warning on pairs of consecutive commands with no overall effect. For instance, the linter would flag ```lean4 namespace X end X ``` and similarly for consecutive pairs of `open` or `section` and `end`. --- - [ ] depends on: #34019, with just the linter implementation - [x] depends on: #34021, with linter-driven corrections - [x] depends on: #34051, with linter-driven corrections [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-linter merge-conflict	219/15	Archive/Imo/Imo2024Q3.lean,Mathlib.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/GlobalSyntax.lean,MathlibTest/FindSyntax.lean,MathlibTest/Tauto.lean,MathlibTest/sqrt.lean	9	13	['Ruben-VandeVelde', 'adomani', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	91-31660 3 months ago	123-10307 123 days ago	0-1774 29 minutes
34926	mattrobball author:mattrobball	test	Testing --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1/1	lean-toolchain	1	9	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'mattrobball']	nobody	91-31410 3 months ago	unknown	0-0 0 seconds
16553	grunweg author:grunweg	WIP: tinkering with orientable manifolds	- wait for #33307 to get merged - PR the "normed space" part separately - WIP: a linear isomorphism on a connected set is either orientation-preserving or orientation-preserving: some form of this was merged into mathlib recently; TODO update this PR accordingly! - [ ] depends on: #33307 - [x] depends on: #8738 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	287/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	91-20574 3 months ago	unknown	0-0 0 seconds
27500	Komyyy author:Komyyy	feat: the Riemann zeta function is meromorphic	Also proves that the Hurwitz zeta function is meromorphic. This PR is split from #27499 to leave a good git diff history. --- The `large-import` change occurs only in the new module, so it poses no problem. - [x] depends on: #27499 - [x] depends on: #29817 This PR continues the work from #25597. Original PR: https://github.com/leanprover-community/mathlib4/pull/25597	WIP t-analysis large-import merge-conflict	87/3	Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Meromorphic/Complex.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/HurwitzZeta.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean	3	21	['Komyyy', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	90-80767 3 months ago	265-29663 265 days ago	30-62878 30 days
26413	michaellee94 author:michaellee94	feat: existence of maximal solutions for ODEs meeting Picard-Lindelöf conditions	Add existence proof for maximal solution of ODE using Picard-Lindelöf and a uniqueness theorem using Grönwall's lemma. --- - [x] depends on: #26382 - [x] depends on: #29186 - [ ] depends on: #35043 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-analysis merge-conflict	1300/431	Mathlib.lean,Mathlib/Analysis/ODE/Basic.lean,Mathlib/Analysis/ODE/ExistUnique.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,docs/1000.yaml,docs/undergrad.yaml	13	95	['botbaki-review', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'michaellee94', 'winstonyin']	nobody	90-66171 3 months ago	322-51957 322 days ago	0-5139 1 hour
33712	wangying11123 author:wangying11123	feat(Geometry/Euclidean/Angle/Unoriented/Projection): Add sameray_orthogonalProjection_vsub_of_angle_lt	Add sameray_orthogonalProjection_vsub_of_angle_lt `sameray_orthogonalProjection_vsub_of_angle_lt` When an angle is acute, the vector to the orthogonal projection lies in the same ray as the given direction vector.	new-contributor t-euclidean-geometry awaiting-author	20/0	Mathlib/Geometry/Euclidean/Angle/Unoriented/Projection.lean	1	4	['JovanGerb', 'github-actions', 'j-loreaux']	JovanGerb assignee:JovanGerb	90-48467 3 months ago	90-48567 90 days ago	39-6778 39 days
33786	hdmkindom author:hdmkindom	feat(Analysis/Matrix): add Jacobian matrix for matrix-valued functions	This PR introduces the Jacobian matrix for matrix-valued functions `F : Matrix m n ℝ → Matrix p q ℝ`. The Jacobian matrix `jacobianMatrix F X` at point `X` is indexed by `(p × q) × (m × n)`, where each entry represents the partial derivative with respect to a basis element. To handle instance-mismatch issues with matrix norms, we use local Frobenius norm instances. mkdir Analysis/Matrix/Jacobian.lean ## Main definitions - `jacobianMatrix F X`: The Jacobian matrix at point `X`, defined by `jacobianMatrix F X (i, k) (j, l) = (fderiv ℝ F X (Matrix.single j l 1)) i k` ## Main theorems - `fderiv_eq_jacobian_mul`: Express the Fréchet derivative as a contraction with the Jacobian - `jacobianMatrix_comp`: Chain rule for Jacobian matrices - `jacobianMatrix_linear`, `jacobianMatrix_id`, `jacobianMatrix_const`: Basic properties - `jacobianMatrix_add`, `jacobianMatrix_smul`: Linearity properties	t-analysis new-contributor awaiting-author	219/0	Mathlib.lean,Mathlib/Analysis/Matrix/Jacobian.lean	2	11	['erdOne', 'github-actions', 'jcommelin']	sgouezel assignee:sgouezel	90-48115 3 months ago	90-48869 90 days ago	39-35999 39 days
30667	FrederickPu author:FrederickPu	feat(‎Mathlib/Algebra/Group/Subgroup/Pointwise): subgroup mul	Title: feat: pointwise products for subgroups Description: showed the point-wise product of disjoint subgroups is equivalent to their Cartesian product. Based on https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/useful.20group.20theory.20lemmas/with/546738566. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	28/0	Mathlib/Algebra/Group/Subgroup/Pointwise.lean	1	23	['FrederickPu', 'eric-wieser', 'github-actions', 'plp127', 'tb65536']	nobody	90-46976 3 months ago	90-51610 90 days ago	1-21290 1 day
34019	adomani author:adomani	feat: global syntax linter	This linter is very unstable when editing interactively a file, since it inspects pairs of commands, rather than individual commands. For this reason, the linter should only run in CI. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import	141/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/GlobalSyntax.lean	4	7	['SnirBroshi', 'adomani', 'bryangingechen', 'github-actions', 'mathlib-splicebot']	nobody	90-44695 3 months ago	unknown	0-0 0 seconds
33793	LTolDe author:LTolDe	feat(MeasureTheory/Constructions/Polish/Basic): add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre	add lemma AnalyticSet.inter_nonempty_of_nowhereMeagre, the main ingredient for the proof of the Effros' Theorem, see [#mathlib4 > Effros Theorem](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Effros.20Theorem/with/566543328) introduce definition of a nowhere meagre set --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor awaiting-author	37/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/GDelta/Basic.lean	3	8	['MichaelStollBayreuth', 'erdOne', 'github-actions', 'j-loreaux']	kex-y assignee:kex-y	90-42733 3 months ago	90-42939 90 days ago	39-9555 39 days
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	Under the current definition, `IsLocalHom f` and `IsLocalHom f.toMonoidHom` are not defeq, which causes quite some annoyances. We also have a consensus to not use `*HomClass` in definitions. As a result, we change `IsLocalHom` to take an unbundled function instead of a funlike. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated merge-conflict label:t-algebra$	18/9	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean	5	15	['adomani', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp']	mattrobball assignee:mattrobball	90-18710 3 months ago	181-70879 181 days ago	24-84527 24 days
25622	eric-wieser author:eric-wieser	refactor: overhaul instances on LocalizedModule	This: * Generalizes the `SMul`, `Module`, and `Algebra` instances via appropriate compatibility conditions * Generalizes the `Mul` instance to the non-unital setting * Fixes instances diamonds for the `Nat`- and `Int`-actions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	214/100	Mathlib/Algebra/Module/LocalizedModule/Basic.lean	1	6	['erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts']	nobody	90-18707 3 months ago	unknown	0-0 0 seconds
25980	Multramate author:Multramate	refactor(Algebra/Group/Submonoid/Operations): rename restrict to domRestrict and add restrict	And update the documentation for consistency	t-group-theory merge-conflict	145/123	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Maps.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	14	10	['Multramate', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts']	nobody	90-18582 3 months ago	90-18583 90 days ago	5-9216 5 days
25981	Multramate author:Multramate	feat(GroupTheory/GroupAction/Basic): define homomorphisms of fixed subgroups induced by homomorphisms of groups	This PR continues the work from #10126. Original PR: https://github.com/leanprover-community/mathlib4/pull/10126	t-group-theory large-import merge-conflict	218/144	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Maps.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	16	8	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts']	nobody	90-18581 3 months ago	90-18581 90 days ago	4-78395 4 days
26377	Whysoserioushah author:Whysoserioushah	feat(RingTheory/SimpleRing/TensorProduct): tensor product of a simple algebra and a central simple algebra is simple	co-authored-by: @jjaassoonn ---	t-ring-theory large-import awaiting-author merge-conflict	326/8	Mathlib.lean,Mathlib/RingTheory/SimpleRing/TensorProduct.lean,Mathlib/RingTheory/TwoSidedIdeal/Kernel.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/TwoSidedIdeal/Operations.lean	5	71	['Ruben-VandeVelde', 'Whysoserioushah', 'chrisflav', 'eric-wieser', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	chrisflav and kbuzzard assignee:kbuzzard assignee:chrisflav	90-18578 3 months ago	62-39738 62 days ago	43-37413 43 days
35313	LexinonCraft author:LexinonCraft	feat: IMO 2025 Q4	This adds a solution for problem 4 from the International Math Olympiad 2025. ---	IMO new-contributor awaiting-author	631/0	Archive.lean,Archive/Imo/Imo2025Q4.lean	2	4	['LexinonCraft', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	90-12607 3 months ago	90-12607 90 days ago	3-30421 3 days
31603	alreadydone author:alreadydone	chore(Algebra): make `RatFunc` an abbrev	I think there's no instance on `FractionRing K[X]` that shouldn't be shared by `RatFunc K`, so it's better to make the latter an abbrev. In the ongoing [Lüroth project](https://github.com/hdlean/mathlib4/pull/1/files#diff-02a084b8d8540eab8a346db8be4ba1a2b39b086bc1407125536d96adf6544544) I've been using `FractionRing K[X]` and it would be nice if we could gain direct access to `RatFunc` API (though not much is relevant, there was already one case where it's helpful), and if our results could be directly applied to RatFunc rather than going through some isomorphism boilerplate. Of course, some `IsRatFunc` predicate could also be an option (IsField + generated by one transcendental element over base field). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra RFC merge-conflict label:t-algebra$	113/423	Mathlib/FieldTheory/Laurent.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/RatFunc/Defs.lean,scripts/nolints_prime_decls.txt	5	24	['Vierkantor', 'alreadydone', 'erdOne', 'github-actions', 'leanprover-bot', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'mattrobball']	erdOne assignee:erdOne	89-82884 3 months ago	177-19708 177 days ago	9-5124 9 days
33276	NicolaBernini author:NicolaBernini	feat: Rename List.reverse_perm to List.reverse_perm_self and List.reverse_perm' to List.reverse_perm_iff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author t-data merge-conflict	17/15	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/Permutation.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/NumberTheory/Divisors.lean	8	5	['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	kim-em assignee:kim-em	89-82751 3 months ago	140-61024 140 days ago	4-4467 4 days
33303	sinhp author:sinhp	feat(CategoryTheory): The monads and comonads of locally cartesian closed categories	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	405/8	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullbacksAlong.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Monad.lean	3	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	89-82750 3 months ago	143-65110 143 days ago	0-20 20 seconds
33795	alreadydone author:alreadydone	feat(Topology/Sheaves): LocalPredicate prerequisite for étalé spaces	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	418/143	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	6	12	['adamtopaz', 'alreadydone', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	adamtopaz assignee:adamtopaz	89-82615 3 months ago	89-82616 89 days ago	34-21636 34 days
33810	dupuisf author:dupuisf	feat: add instances of `LawfulInv`	--- - [ ] depends on: #33441 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict blocked-by-other-PR	187/22	Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean	9	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	89-82614 3 months ago	129-21156 129 days ago	0-1 1 second
34075	eric-wieser author:eric-wieser	feat: add a typeclass for the continuum hypothesis	This allows a proof from the Archive to be promoted to mathlib itself. The proof strategy of `iff_exists_sierpinski_pathological_pred` was written almost entirely with public Gemini 3 Thinking, and then manually corrected. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	200/58	Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/SetTheory/Cardinal/ContinuumHypothesis.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	27	['b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	nobody	89-81433 3 months ago	38-20212 38 days ago	0-44643 12 hours
34179	alreadydone author:alreadydone	refactor(Algebra): weaken NormalizationMonoid	This PR replaces the two fields ``` normUnit_mul : ∀ {a b}, a ≠ 0 → b ≠ 0 → normUnit (a * b) = normUnit a * normUnit b normUnit_coe_units : ∀ u : αˣ, normUnit u = u⁻¹ ``` in the definition of NormalizationMonoid by ``` normUnit_one : normUnit 1 = 1 normUnit_mul_units {a : α} (u : αˣ) : a ≠ 0 → normUnit (a * u) = u⁻¹ * normUnit a ``` and rename the old version to StrongNormalizationMonoid. The vast majority of API continue to hold under this weakened notion of NormalizationMonoid; only a handful requires the original notion. Every cancellative monoid with zero admits a weakened NormalizationMonoid structure, and every GCDMonoid admits a weakened NormalizedGCDMonoid structure. This allows us to generalize [Polynomial.normalizedGcdMonoid](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Polynomial/Content.html#Polynomial.normalizedGcdMonoid) to all GCDMonoids. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra awaiting-author merge-conflict label:t-algebra$	505/330	Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/IntegrallyClosed.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/GCDMonoid/PUnit.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/PowerSeries/Inverse.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Finite.lean,Mathlib/RingTheory/UniqueFactorizationDomain/GCDMonoid.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Multiplicative.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	20	28	['alreadydone', 'erdOne', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	erdOne assignee:erdOne	89-81429 3 months ago	107-23854 107 days ago	9-10392 9 days
34955	thorimur author:thorimur	chore: test overlapping instances linter	This draft PR is intended to test-run the syntax version of the overlapping instances linter in [this PR](https://github.com/JovanGerb/mathlib4/pull/1). The two purposes are 1. benching 2. figuring out which violations we should exempt/fix This PR is not intended to be merged. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	515/14	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Shift/Pullback.lean,Mathlib/Init.lean,Mathlib/Lean/ContextInfo.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/Lean/LocalContext.lean,Mathlib/Lean/Message.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/OverlappingInstances.lean,MathlibTest/OverlappingInstances.lean	14	8	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	nobody	89-81160 3 months ago	unknown	0-0 0 seconds
26299	adomani author:adomani	perf: the `whitespace` linter only acts on modified files	Introduces an `IO.Ref` to allow the `commandStart` linter to only run on files that git considers modified with respect to `master`. The linter is also active on files that have had some error, as these are likely being modified! The PR should also mitigate the speed-up that the linter introduced: [#mathlib4 > A whitespace linter @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/A.20whitespace.20linter/near/525091877) Assuming that this goes well, a similar mechanism could be applied to several linters that do not need to run on all code, just on the modified code. Implementation detail: the linter is currently either on or off in "whole" files. It may be also a future development to make this more granular and only run the linter on "modifed commands in modified files", but this is not currently the plan for this modification! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-zulip awaiting-author	55/7	Mathlib/Tactic/Linter/Whitespace.lean	1	20	['adomani', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-bot', 'leanprover-radar', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	89-75049 3 months ago	262-71367 262 days ago	66-73556 66 days
35345	grunweg author:grunweg	feat(Linter.openClassical): also lint for Classical declarations as	…a local or scoped instance. Rebased and migrated version of #23763. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	131/31	Mathlib/RingTheory/Perfection.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean,MathlibTest/LintStyle.lean	4	1	['github-actions']	nobody	89-71450 3 months ago	92-31654 92 days ago	0-26672 7 hours
34674	Citronhat author:Citronhat	feat(Algebra/Order/Ring): replace ENNReal lemmas with WithTop versions	* Add `WithTop` versions of basic multiplicative order lemmas. * Use the new `WithTop` lemmas to replace `ENNReal` proofs and address six TODOs. * Fix a typo in the `pos_of_ne_zero` alias name.	new-contributor t-algebra merge-conflict label:t-algebra$	46/15	Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Data/ENNReal/Operations.lean	3	5	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	Ruben-VandeVelde assignee:Ruben-VandeVelde	89-62485 3 months ago	89-62486 89 days ago	17-1225 17 days
31892	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/PolePolar): poles and polars	Define poles and polars for spheres in Euclidean affine spaces, and set up some basic API, including in particular La Hire's theorem (`p₁` lies on the polar of `p₂` if and only if `p₂` lies on the polar of `p₁`). Poles and polars are actually meaningful for any quadric in a projective space over any field, but I think it's reasonable to set up this theory for spheres in the Euclidean context and potentially link it in future to more general projective geometry. --- - [ ] depends on: #31891 - [ ] depends on: #32296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	424/7	Mathlib.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean	4	4	['Parcly-Taxel', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	89-56271 3 months ago	52-37611 52 days ago	52-38364 52 days
31893	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/Tangent): characterize `tangentsFrom`	Add lemmas relating tangency to polars, and thereby characterizing `tangentsFrom`: empty for a point inside the sphere, a singleton for a point on the sphere and, in two dimensions, of cardinality two for a point outside the circle. --- - [ ] depends on: #31891 - [ ] depends on: #31892 - [ ] depends on: #32296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-euclidean-geometry	483/9	Mathlib.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean	4	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	89-56205 3 months ago	178-57804 178 days ago	0-313 5 minutes
35324	harahu author:harahu	chore: add H1 headers	This PR introduces a script that identifies lean files that don't have an H1 header. I've added a placeholder header to the identified files and will use this branch to develop smaller PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	1749/0	Archive/Wiedijk100Theorems/CubingACube.lean,Cache/Hashing.lean,Cache/IO.lean,Cache/Init.lean,Cache/Main.lean,Cache/Requests.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/IrrationalPowerOfIrrational.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/ArithmeticGeometric.lean,Mathlib/Algebra/Category/Grp/FiniteGrp.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/CharP/Frobenius.lean,Mathlib/Algebra/GroupWithZero/Int.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/HomologicalComplexBiprod.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomologicalFunctor.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/TotalComplexSymmetry.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/ModEq.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/Expand.lean,Mathlib/Algebra/NoZeroSMulDivisors/Prod.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Interval/Set/Group.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Monoid/ToMulBot.lean,Mathlib/Algebra/Order/PartialSups.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Factors.lean,Mathlib/Algebra/QuadraticAlgebra.lean,Mathlib/AlgebraicGeometry/Morphisms/UnderlyingMap.lean,Mathlib/AlgebraicTopology/DoldKan/Compatibility.lean,Mathlib/AlgebraicTopology/DoldKan/EquivalenceAdditive.lean,Mathlib/AlgebraicTopology/DoldKan/GammaCompN.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Calculus/ContDiff/RestrictScalars.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/Analytic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Module/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Analysis/NormedSpace/Alternating/Curry.lean,Mathlib/Analysis/NormedSpace/Alternating/Uncurry/Fin.lean,Mathlib/Analysis/NormedSpace/BallAction.lean,Mathlib/Analysis/NormedSpace/ConformalLinearMap.lean,Mathlib/Analysis/NormedSpace/Connected.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/Extend.lean,Mathlib/Analysis/NormedSpace/Extr.lean,Mathlib/Analysis/NormedSpace/FunctionSeries.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/NormedSpace/HahnBanach/SeparatingDual.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/Analysis/NormedSpace/Int.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/MultipliableUniformlyOn.lean,Mathlib/Analysis/NormedSpace/Normalize.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Asymptotics.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Mul.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Prod.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Analysis/NormedSpace/RCLike.lean,Mathlib/Analysis/NormedSpace/Real.lean,Mathlib/Analysis/NormedSpace/RieszLemma.lean,Mathlib/Analysis/NormedSpace/SphereNormEquiv.lean,Mathlib/Analysis/Real/Pi/Leibniz.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/CategoryTheory/Adhesive.lean	348	3	['github-actions', 'harahu', 'mathlib-merge-conflicts']	nobody	88-2665 2 months ago	unknown	0-0 0 seconds
34240	mcdoll author:mcdoll	feat(Analysis/Distribution): additional properties of the support	--- - [x] depends on: #34593 - [x] depends on: #34595 - [ ] depends on: #34637 - [x] depends on: #34638 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict blocked-by-other-PR	494/2	Mathlib/Analysis/Calculus/FDeriv/Const.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Deriv.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	6	4	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	87-86020 2 months ago	117-16124 117 days ago	0-34 34 seconds
35558	mcdoll author:mcdoll	feat(Analysis/Distribution): algebraic properties of the support	--- - [ ] depends on: #34637 - [ ] depends on: #33477 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-analysis merge-conflict	325/0	Mathlib/Analysis/Distribution/Support.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	87-85602 2 months ago	87-85603 87 days ago	0-1208 20 minutes
35352	themathqueen author:themathqueen	feat(Analysis/CStarAlgebra): the norm of a positive linear functional `f` on a unital C*-algebra is `f 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	24/0	Mathlib/Analysis/CStarAlgebra/GelfandNaimarkSegal.lean,Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean	2	7	['github-actions', 'j-loreaux', 'themathqueen']	j-loreaux assignee:j-loreaux	87-70468 2 months ago	87-70471 87 days ago	4-65379 4 days
25989	Multramate author:Multramate	feat(NumberTheory/EllipticDivisibilitySequence): add elliptic nets	This PR continues the work from #25030. Original PR: https://github.com/leanprover-community/mathlib4/pull/25030	t-number-theory large-import awaiting-author	254/39	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	27	['MichaelStollBayreuth', 'Multramate', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib4-merge-conflict-bot', 'tb65536']	tb65536 assignee:tb65536	87-64575 2 months ago	87-64575 87 days ago	55-47427 55 days
35411	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Enriched/Limits): define cotensors in an enriched category	Defines the notion of cotensors in a `V`-category `C`, where `V` is a braided monoidal category. Proves that `V` itself has all cotensors when viewed as a category enriched in `V`. Also proves that if `C` has all cotensors and `V` is additionally symmetric then the cotensors form a `V`-functor from the enriched tensor product`V\op \times C` to `C`. --- This work originates from the infinity-cosmos project, where the dual theory of tensors was formalized by @arnoudvanderleer . The current version of this code introduces an `abbrev` definition `Ehom V C x y` for the hom-object C(x, y) in V. The intention is to make the code easier to both to write and read; the existing notation `x \hom[V] y` throws an error when instantiated at `C` = `V` (`ambiguous term;` `Possible interpretations:` `(ihom x).obj y : V` `x ⟶[V] y : V`). A possibly related issue is there are a few calls to `erw` that stem from a failure to identify `(ihom x).obj : V` with `Ehom V V x y`. Any help with these issues, or any other assistance, is greatly appreciated! - [ ] depends on: #35144 [required to prove `V`-functoriality of cotensors] - [ ] depends on: #35436 [required to prove that `V` admits all cotensors by itself] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory infinity-cosmos blocked-by-other-PR merge-conflict	822/0	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/Cotensors.lean,Mathlib/CategoryTheory/Enriched/TensorProductCategory.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/InternalCurrying.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	87-63061 2 months ago	91-43846 91 days ago	0-8 8 seconds
35545	joelriou author:joelriou	feat(Algebra/Category/ModuleCat): the internal hom for presheaves of modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP please-adopt label:t-algebra$	141/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/InternalHom.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean	3	1	['github-actions']	nobody	87-61199 2 months ago	88-29799 88 days ago	0-2 2 seconds
28246	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): the n-sphere is simply connected for n > 1	Prove that the `n`-dimensional sphere (i.e., the unit sphere centered at the origin in `(n + 1)`-dimensional real Euclidean space) is a simply connected space for `n > 1`. This proof follows Hatcher's "Algebraic Topology"; we first prove a general lemma about decomposing loops and then exploit the fact that non-surjective loops in the sphere are homotopically trivial. Note: To get this file to build, I edited `Mathlib/Tactic/Linter/DirectoryDependency.lean` to remove the restrictions on AlgebraicTopology files importing Geometry, NumberTheory, and FieldTheory files. Thank you to those who shared their expertise [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Warning.20that.20AlgebraicTopology.20can't.20import.20SetTheory/with/533833638). As I understand it, this is just a short-term solution, so I would appreciate feedback on what to do about this situation. Note: I am unsure where exactly the file `SimplyConnectedSphere.lean` should go or whether that is an appropriate name for the file, so feedback there would be appreciated. --- To provide additional context, this code was written as a part of the Fields Undergraduate Summer Research Program at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza. - [x] depends on: #28208 - [x] depends on: #28198 - [x] depends on: #28185 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor awaiting-author	343/3	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	17	['dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	87-60271 2 months ago	87-60271 87 days ago	13-72199 13 days
31611	thorimur author:thorimur	feat(Meta): `withPlural` wrapper for more readable messages in source	This small PR introduces a thin wrapper `withPlural` for Lean's textual datatypes so that we can write ``` "foo".withPlural "foos" count ``` instead of ``` if count = 1 then "foo" else "foos" ``` The dot notation here is chosen so that the singular version of the word appears at the start of the syntax, as opposed to buried in an `if/then`. This makes dynamically pluralizing a word in `MessageData` (which is a relatively common occurrence) a bit easier to read in source, especially when multiple pluralizations are needed close to one another. --- Am I handling the copyright header correctly? My reasoning is that the file was devoid of content, and so this is ultimately a new file. But I'm not sure this is technically what should happen here. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict	63/5	Mathlib/Lean/Message.lean	1	21	['adomani', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'thorimur']	nobody	87-52498 2 months ago	164-37155 164 days ago	21-2788 21 days
35524	grunweg author:grunweg	feat: text-based linter against \t followed by tactic mode	Wait for the zulip discussion to converge. If there is consensus in favour of this change, summarise the motivation here. [zulip discuss](https://leanprover.zulipchat.com/#narrow/channel/345428-mathlib-reviewers/topic/proposal.3A.20no.20more.20use.20of.20.60.E2.96.B8.60.20in.20Mathlib.3F/with/574680826) --- There are currently 80 remaining exceptions in mathlib: ideally, these would get fixed before merging this. Works best when combined with #35523. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-zulip merge-conflict	23/2	Mathlib/Tactic/Linter/TextBased.lean	1	5	['github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'vihdzp']	nobody	87-45668 2 months ago	88-68440 88 days ago	0-3308 55 minutes
35578	Shreyas4991 author:Shreyas4991	fix: writer monad should use an additive logging type	The Writer monad's w type is supposed to be additive, not multiplicative. This is how it is conceptually used in Haskell (as a logging type). Haskell uses `Monoid` because it doesn't make a distinction between `AddMonoid` and `Monoid`. [#mathlib4 > Writer should use an additive monoid @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Writer.20should.20use.20an.20additive.20monoid/near/574990415) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip merge-conflict	10/10	Mathlib/Control/Monad/Cont.lean,Mathlib/Control/Monad/Writer.lean	2	5	['Shreyas4991', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	87-24182 2 months ago	87-24183 87 days ago	0-18707 5 hours
35591	JovanGerb author:JovanGerb	draft: `gsimp` tactic	This is a draft PR for exploring a potential `gsimp` tactic. It would be able to do some things that the current `grw` tactic cannot do. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	1233/0	Mathlib/Tactic/GSimp/Core.lean,Mathlib/Tactic/GSimp/Elab.lean,Mathlib/Tactic/GSimp/GSimpTheorems.lean,Mathlib/Tactic/GSimp/Rewrite.lean,Mathlib/Tactic/GSimp/Types.lean,MathlibTest/GSimp.lean	5	3	['github-actions', 'mathlib-bors']	nobody	87-18397 2 months ago	87-18474 87 days ago	0-6 6 seconds
34873	Hagb author:Hagb	feat(RingTheory/MvPolynomial/Groebner/Remainder): polynomial remainder used with Gröbner basis	Definition and properties of remainder on division of a multivariate polynomial by a set of multivariate polynomials. Some lemmas are for formalization of properties of Gröbner basis. The previous `Mathlib/RingTheory/MvPolynomial/Groebner.lean` is moved to `Mathlib/RingTheory/MvPolynomial/Groebner/Division.lean`, and used by `Mathlib/RingTheory/MvPolynomial/Groebner/Remainder.lean` for the proof of remainder's existence. The PR is upstreamized from https://github.com/WuProver/groebner_proj. Co-authored-by: Hao Shen [3118181069@qq.com](mailto:3118181069@qq.com) --- CC @tsuki8 - [ ] depends on: #34759 - [ ] depends on: #34872 todo: - [ ] some theorems can be generalized to avoid requiring `IsUnit` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-ring-theory WIP merge-conflict	1324/262	Mathlib.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Logic/Basic.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/Groebner/Division.lean,Mathlib/RingTheory/MvPolynomial/Groebner/Remainder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,docs/references.bib	11	4	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	86-50409 2 months ago	102-50581 102 days ago	0-455 7 minutes
35619	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Clique): intersection and union of cliques	Plus a couple of lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	29/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Data/Set/Pairwise/Basic.lean	1	13	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	86-15021 2 months ago	25-41423 25 days ago	47-17441 47 days
12933	grunweg author:grunweg	chore: replace some use of > or ≥ by < or ≤	These were flagged by the linter in #12879: it is easy to simple avoid > or ≥ in hypotheses or `have`s. --- - [x] depends on: #35346 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	123/123	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/Sequences.lean,test/LibrarySearch/basic.lean,test/Use.lean,test/cancel_denoms.lean,test/linarith.lean,test/norm_cast.lean	64	7	['YaelDillies', 'github-actions', 'grunweg', 'mathlib-dependent-issues']	nobody	86-59 2 months ago	732-70338 732 days ago	0-55656 15 hours
34941	urkud author:urkud	feat(FDeriv/Prod): generalize to TVS	--- Doesn't work yet - [ ] depends on: #34867 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-analysis	326/178	Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/CompCLM.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean	10	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	85-38532 2 months ago	100-82073 100 days ago	0-50 50 seconds
33746	ster-oc author:ster-oc	feat(Algebra/Module/ZLattice): align `ZSpan.floor` to `Int.floor` API	This PR adds some of the existent lemmas about `Int.floor`, `Int.ceil` and `Int.fract` to the `ZSpan` namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor merge-conflict label:t-algebra$	353/145	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Topology/Algebra/Order/Floor.lean	3	8	['github-actions', 'joelriou', 'mathlib-merge-conflicts', 'ster-oc']	joelriou assignee:joelriou	84-79383 2 months ago	84-79383 84 days ago	30-23357 30 days
28291	vasnesterov author:vasnesterov	feat(Tactic): tactic for computing asymptotics of real functions	It's an auxiliary PR that implements the entire `compute_asymptotics` tactic. I am spliting it into multiple small PRs. --- Tactic description: https://vasnesterov.github.io/compute_asymptotics Zulip announcement: [#announce > New tactic: `compute_asymptotics`](https://leanprover.zulipchat.com/#narrow/channel/113486-announce/topic/New.20tactic.3A.20.60compute_asymptotics.60/with/538639418) In this PR I implement the `compute_asymptotics` tactic. Its purpose is to compute asymptotics of functions from `ℝ` to `ℝ`. So far it is able to compute the limit of any function constructed using arithmetic operations (`+`, `-`, ``, `/`, inversion), powers, logarithms, and exponents. ```lean import Mathlib.Tactic.ComputeAsymptotics open Real Filter Topology Asymptotics example : Tendsto (fun (x : ℝ) ↦ (1 + 6 x⁻¹) ^ (7 * x)) atTop (𝓝 (exp 42)) := by compute_asymptotics example : (fun x ↦ x - 1 - log x) ~[𝓝[≠] 1] (fun x ↦ (x - 1) ^ 2 / 2) := by compute_asymptotics example (a b : ℝ) (h : a < b) : (fun x ↦ (x + x * log x) ^ a) =O[atTop] (fun x ↦ (x / log x) ^ b) := by compute_asymptotics example : (fun x ↦ log x) =o[𝓝[>] 0] (fun x ↦ Real.pi / (exp (Real.log 2 * x) - 1)) := by compute_asymptotics ``` For more examples see `compute_asymptotics.lean` in tests. ### TODO * Different domains in `compute_limit` as well. * Trigonometric functions and Gamma-function. ### References I am basically implementing [this article](https://www21.in.tum.de/~eberlm/pdfs/real_asymp.pdf) about computing asymptotics in Isabelle by Manuel Eberl. ### Small PRs Here's a few smaller PRs coming from this one, ordered by importance: - [ ] depends on: #37415 - [ ] depends on: #37342 - [x] depends on: #37418 - [x] depends on: #37411 - [x] depends on: #37414 - [x] depends on: #37419 - [x] depends on: #35072 - [x] depends on: #34922 - [x] depends on: #34356 - [x] depends on: #34422 - [x] depends on: #34403 - [x] depends on: #34311 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis t-meta large-import blocked-by-other-PR	12797/70	Mathlib.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/SpecialFunctions/Complex/Analytic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/BasisM.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/CompareMS.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/CompareReal.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConstSimp.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConstSimpAttribute.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ConvertDomain.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Exp.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/LeadingMonomial.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Log.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/MS.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Misc.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Normalization.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Trimming.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/ZeroOracle.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Defs.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/LogBasis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/LeadingMonomial.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Add.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Exp.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Inv.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Log.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Mul.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Pow.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Powser.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Trimming.lean,MathlibTest/compute_asymptotics.lean	42	23	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'ocfnash', 'vasnesterov']	nobody	84-54818 2 months ago	279-55745 279 days ago	0-54 54 seconds
35671	CoolRmal author:CoolRmal	feat: APIs for semifinite measures	This PR introduces the definition of a semifinite measure. The main theorems shown in this file are: - Sigma finite measures are semifinite. - `measure_eq_zero_of_measure_inter_finite_eq_zero`: Let `s` be a measurable set such that its intersection with any set of finite measure is null. Then `s` is null. Consequently, in order to check whether a proposition holds almost everywhere, it suffices to check it holds almost everywhere in every set with finite measure. - A measure is semifinite iff it equals to its semifinite part. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-measure-probability	107/0	Mathlib/MeasureTheory/Measure/Typeclasses/Semifinite.lean	1	4	['CoolRmal', 'RemyDegenne', 'github-actions']	nobody	84-46401 2 months ago	85-5565 85 days ago	0-14 14 seconds
35666	urkud author:urkud	chore(Calculus/FDeriv/Pi): migrate to TVS	--- - [ ] depends on: #35663 - [ ] depends on: #34941 - [ ] depends on: #34867 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	330/179	Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/CompCLM.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/Linear.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Pi.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean	11	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	84-45615 2 months ago	85-13972 85 days ago	0-827 13 minutes
31766	SuccessMoses author:SuccessMoses	feat(Topology/EMetricSpace): continuity of arc length	fixes half of #31751 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author merge-conflict	396/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/ArcLength.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	3	40	['SnirBroshi', 'SuccessMoses', 'alreadydone', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	84-24680 2 months ago	160-25550 160 days ago	2-77113 2 days
33257	NickAdfor author:NickAdfor	feat(Combinatorics/SimpleGraph/Bipartite): Odd Cycle Theorem (A Solution to TODO)	Prove bipartite iff all cycles are even This PR formalizes the classical graph theory theorem: a graph is bipartite if and only if all its cycles have even length. Co-authored-by: Nick Adfor Co-authored-by: Yue Sun Co-authored-by: Aristotle AI --- ## Main results - `SimpleGraph.bipartite_iff_all_cycles_even` : the main equivalence theorem ## Key supporting lemmas - `SimpleGraph.even_length_iff_same_color` : parity lemma for 2-colorings - `SimpleGraph.even_length_iff_even_bypass_length` : bypass length parity - `SimpleGraph.even_cycle_length_of_path` : cycle construction lemma - `SimpleGraph.bypass_eq_nil_of_closed` : closed path properties ## Proof outline 1. For bipartite graphs: use the 2-coloring to show that in a 2-coloring, a walk has even length iff its endpoints have the same color. 2. For cycles (start = end), this forces even length. 3. For the converse: if all cycles are even, construct a 2-coloring using the `two_colorable_iff_forall_loop_even` characterization. 4. Show this coloring is valid using bypass operations and path properties. ## Technical notes - Uses `SimpleGraph.Walk` for path/cycle representation - Handles both `IsPath` and `IsCycle` predicates - Uses bypass operations (`takeUntil`, `dropUntil`, `bypass`) to analyze walks - Requires `DecidableEq V` for some lemmas - Uses classical logic for case analysis ## Reviewer notes - The proof uses induction on walks and case analysis on colorings - Some lemmas (like `even_length_iff_same_color`) could be extracted to more general locations - All theorems are in the `SimpleGraph` namespace - The `bipartite_iff_all_cycles_even` theorem provides the complete characterization	t-combinatorics new-contributor awaiting-author LLM-generated merge-conflict	164/8	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	2	80	['IvanRenison', 'NickAdfor', 'Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'euprunin', 'github-actions', 'kmill', 'mathlib-merge-conflicts', 'mitchell-horner', 'vihdzp', 'vlad902']	YaelDillies assignee:YaelDillies	84-13654 2 months ago	55-72342 55 days ago	52-32521 52 days
33691	kim-em author:kim-em	feat(scripts): add find-ci-errors.sh to diagnose widespread CI failures	This PR adds a script that searches through recent failed CI workflow runs to find open PRs whose current CI contains a specific error string. Useful for diagnosing widespread CI issues affecting multiple PRs (e.g., infrastructure problems, toolchain bugs). Usage: ```bash # Find all PRs currently failing with a specific error ./scripts/find-ci-errors.sh "Error parsing args: cannot parse arguments" # Find PRs and automatically add please-merge-master label to trigger rebuilds ./scripts/find-ci-errors.sh --please-merge-master "cannot parse arguments" ``` The `--please-merge-master` flag skips PRs with merge conflicts, and the label is automatically removed by CI once the build completes. 🤖 Prepared with Claude Code	CI delegated merge-conflict LLM-generated	196/0	scripts/README.md,scripts/find-ci-errors.sh	2	6	['bryangingechen', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	83-81448 2 months ago	132-13943 132 days ago	0-7055 1 hour
29776	yuanyi-350 author:yuanyi-350	chore: refactor `ContinuousLinearMap.isOpenMap` by separating it into sublemmas	The open mapping theorem in mathlib proves A ⇒ C by first proving A ⇒ B and then B ⇒ C in one theorem. In my PR, I separated it into two theorems: A ⇒ B and B ⇒ C. And now B ⇒ C is more general, with weaker assumptions than A ⇒ C. The [open mapping theorem](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Operator/Banach.html#ContinuousLinearMap.isOpenMap) in mathlib need `f` to be surjective. However, this can be weakened to the condition `h : ∃ (n : ℕ) (x : _), x ∈ interior (closure (f '' ball 0 n))` . I need this stronger formulation to prove the closed range theorem c.f. Rudin Functional Analysis Thm 4.13 [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/refactor.20.60ContinuousLinearMap.2EisOpenMap.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	53/33	Mathlib/Analysis/Normed/Operator/Banach.lean	1	17	['faenuccio', 'github-actions', 'kckennylau', 'leanprover-bot', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	83-52378 2 months ago	240-11766 240 days ago	2-45741 2 days
35494	Timeroot author:Timeroot	feat(Topology/Perfect): simp frontier_singleton	Add simp lemma ``` theorem frontier_singleton {X : Type*} [TopologicalSpace X] [T1Space X] [PerfectSpace X] (p : X) : frontier {p} = {p} ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	4/0	Mathlib/Topology/Perfect.lean	1	4	['Timeroot', 'github-actions', 'urkud', 'vihdzp']	urkud assignee:urkud	83-47857 2 months ago	84-6993 84 days ago	5-41003 5 days
34867	urkud author:urkud	feat(FDeriv/Comp): migrate to TVS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #34832	t-analysis awaiting-author	94/91	Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean	3	21	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'urkud']	j-loreaux assignee:j-loreaux	83-37826 2 months ago	83-37826 83 days ago	15-63776 15 days
34419	ster-oc author:ster-oc	feat(RCLike): add `Continuous.re` and similar	This PR adds dot notation for `re`, `im`, `conj` and `ofReal` for `Continuous`, `LipschitzWith` and `Memℓp`. Given `hf : Continuous f` it allows to use `hf.re` to express `Continuous (fun x ↦ (f x).re)`, similarly to the usual `hf.add hg`. I also can add the same features for `Summable` but I am not sure where to place them, suggestions are appreciated! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor awaiting-author merge-conflict	186/41	Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/RCLike/Basic.lean	3	15	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'ster-oc']	j-loreaux assignee:j-loreaux	83-36778 2 months ago	83-36778 83 days ago	8-29654 8 days
33247	sun123zxy author:sun123zxy	feat(Mathlib/RingTheory/Ideal/Cotangent): dimension of cotangent spaces	It is shown that the span rank of the maximal ideal of a local ring equals the dimension of the cotangent space if the maximal ideal is finitely generated. To avoid unnecessary imports, the original `Mathlib/RingTheory/Nakayama` is now moved to `Mathlib/RingTheory/Nakayama/Basic`. --- - [ ] depends on: #33359 - [ ] depends on: #33361 - [ ] depends on: #35651 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed new-contributor t-ring-theory WIP blocked-by-other-PR merge-conflict	140/27	Mathlib.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/LocalRing/Module.lean,Mathlib/RingTheory/LocalRing/Quotient.lean,Mathlib/RingTheory/Nakayama/Basic.lean,Mathlib/RingTheory/Nakayama/SpanRank.lean,Mathlib/RingTheory/Regular/RegularSequence.lean,Mathlib/RingTheory/Support.lean	10	13	['erdOne', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sun123zxy']	nobody	83-21016 2 months ago	142-28164 142 days ago	3-72713 3 days
34759	Hagb author:Hagb	feat(RingTheory/MvPolynomial/MonomialOrder): add degree with `⊥` as degree of `0`	`withBotDegree` is to distinguish the degree of zero polynomial from the degree of non-zero constant polynomial. `MonomialOrder.degree` of both are 0, while `withBotDegree` is `⊥` for zero polynomial and 0 for non-zero constant polynomial. `MonomialOrder.withBotDegree` is to `MonomialOrder.degree` as `Polynomial.degree` is to `Polynomial.natDegree`. It's upstreamized from https://github.com/WuProver/groebner_proj. --- `MonomialOrder.withBotDegree` is to [`MonomialOrder.degree`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=MonomialOrder.degree#doc) as [`Polynomial.degree`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=Polynomial.degree#doc) is to [`Polynomial.natDegree`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=Polynomial.natDegree#doc). It's upstreamized from [`Groebner/MonomialOrder.lean` in the repo `WuProver/groebner_proj`](https://github.com/WuProver/groebner_proj/blob/main/Groebner/MonomialOrder.lean). - [x] ~~depends on: #34755~~ - [x] depends on: #34756 - [x] depends on: #34758 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	346/3	Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	5	17	['Hagb', 'github-actions', 'joneugster', 'mariainesdff', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	83-20643 2 months ago	10-53072 10 days ago	45-41136 45 days
34805	DavidLedvinka author:DavidLedvinka	feat(Tactic): generalize ofScientific NormNum extension to `DivisionSemiring`	Co-authored-by: @hrmacbeth	t-meta merge-conflict awaiting-author	68/20	Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/OfScientific.lean,MathlibTest/norm_num.lean	3	26	['DavidLedvinka', 'JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'thorimur']	dwrensha assignee:dwrensha	83-20640 2 months ago	58-30617 58 days ago	78-71499 78 days
34853	GrigorenkoPV author:GrigorenkoPV	feat(Combinatorics/Enumerative/Catalan): ratio of subsequent Catalan numbers	--- Should I split this into 2 PRs? Otherwise it'll get squashed & be less concise. UPD: ok, I've opened #34854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	305/195	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Enumerative/Catalan/Basic.lean,Mathlib/Combinatorics/Enumerative/Catalan/Ratio.lean,Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	7	6	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	83-20639 2 months ago	101-48324 101 days ago	1-62439 1 day
35735	mkaratarakis author:mkaratarakis	feat(NumberTheory): analytical properties and lower bounds for Gelfond-Schneider auxiliary function	This PR is the third component in the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem). It connects the algebraically constructed auxiliary function `R(x)` to its analytical properties, establishing the exact order of vanishing and the fundamental lower bound on the norm of its non-zero derivative evaluation. Following the argument in Loo-Keng Hua's Introduction to Number Theory (Chapter 17.9, equations (4) and (5)), we define the minimal non-vanishing derivative order $r$ and scale the evaluation to an algebraic integer to compute its norm. 1. (`iteratedkDeriv_R_eq_zero` & `order_geq_n`): We verify that the coefficient vector $\eta$ (chosen via Siegel's lemma in the previous PR) forces the first $n$ derivatives of the auxiliary function $R(x)$ to vanish at the points $x \in \{1, 2, \dots, m\}$. Consequently, the analytical order of $R(x)$ at these points is at least $n$. 2. We extract $r$, the exact minimal order of vanishing of $R(x)$ among all points $1 \le l \le m$, and prove that $n \le r$. 3. We define the non-zero algebraic number $\rho = (\log \alpha)^{-r} R^{(r)}(l_0)$. 4. We prove the crucial textbook step that scaling $\rho$ by $c_1^{r+2mq}$ (formalized here as `cρ`) results in an algebraic integer in $\mathcal{O}_K$. 5. Because $c_1^{r+2mq} \rho$ is a non-zero algebraic integer, the absolute value of its norm is at least $1$. We use this to formally prove the strict lower bound on the absolute norm of the unscaled $\rho$: $\|N(\rho)\| > c_1^{-h(r+2mq)} > c_5^{-r}$. --- - [ ] depends on: #35734 [optional extra text] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor blocked-by-other-PR	1141/0	Mathlib.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainOrder.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	83-8097 2 months ago	83-30553 83 days ago	0-362 6 minutes
35743	mkaratarakis author:mkaratarakis	feat(NumberTheory): non-vanishing derivative and norm lower bounds for Gelfond-Schneider	This PR continues the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem). It establishes the critical algebraic foundation for the lower bound of the auxiliary function's evaluation by isolating its first non-vanishing derivative and proving its scaled norm is strictly bounded below. Following the contradiction argument in Loo-Keng Hua's Introduction to Number Theory (Chapter 17.9), we verify that the evaluation at the minimal non-vanishing order $r$ yields a strictly non-zero algebraic integer when appropriately scaled. 1) Confirms that the $r$-th derivative of the auxiliary function $R(x)$ at $l_0 + 1$ is strictly non-zero, and formally translates this into the non-zero algebraic element $\rho$. 2) Formalizes the crucial algebraic step that scaling the evaluated system coefficients by $c_1^{r+2mq}$ (formalized as `cρ`) clears all denominators, resulting in a strictly non-zero algebraic integer within $\mathcal{O}_K$. 3) Concludes that because the scaled $\rho$ is a non-zero algebraic integer, its absolute norm is strictly bounded below by 1. This formalizes the core Diophantine principle that non-zero integers cannot be arbitrarily small, establishing the algebraic foundation required to oppose the complex analytic upper bound in the final contradiction step. --- - [ ] depends on: #35735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	1650/0	Mathlib.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAnalytic.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainOrder.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	83-7866 2 months ago	83-7867 83 days ago	0-2369 39 minutes
35755	Vilin97 author:Vilin97	feat(Analysis/ODE): forward Euler method convergence	WIP Prove the convergence of the Forward Euler Method. This is the first theorem in most textbooks on numerical analysis for ODEs. --- The initial proof was produced by [Aristotle](https://aristotle.harmonic.fun). The code was then iteratively refined (factoring out lemmas, golfing, simplifying proofs) using Claude Code (Claude Opus 4.6). * [ ] depends on: #35753	new-contributor WIP LLM-generated merge-conflict	297/0	Mathlib.lean,Mathlib/Analysis/ODE/EulerMethod.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	4	7	['Vilin97', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	82-71486 2 months ago	82-73697 82 days ago	0-674 11 minutes
35296	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): taking or droping from a cycle results in a path	--- - [x] depends on: #33249 - [ ] depends on: #35295 - [ ] depends on: #35292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics merge-conflict	80/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Data/List/Infix.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	82-61920 2 months ago	93-59009 93 days ago	0-1258 20 minutes
25834	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): girth-diameter inequality	This is a useful inequality that comes up in proofs related to Moore graphs, cages, SRGs, and so on. --- - [x] depends on: #26380 - [x] depends on: #25650 - [x] depends on: #26614 - [x] depends on: #33249 - [ ] depends on: #33506 - [ ] depends on: #35296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	31/6	Mathlib/Combinatorics/SimpleGraph/Girth.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	82-57919 2 months ago	339-70063 339 days ago	0-28 28 seconds
33543	JovanGerb author:JovanGerb	feat: use `to_dual` for `HeytingAlgebra`	This PR adds `to_dual` for `HeytingAlgebra`, `BiheytingAlgebra`, `GeneralizedHeytingAlgebra`. I am a bit worried about the fact that the complement operation is self-dual in a `BooleanAlgebra`, because that means that, depending on the context, `compl` needs to be translated to `hnot` or `compl`. So if we want to dualize lemmas about `BooleanAlgebra` and `compl`, we will not be able to. But I hope that the number of such lemmas is small and that they aren't often used in places that can get a `to_dual` tag (e.g. when specialized to sets, they don't need a `to_dual` tag). Aligning the `Heyting` and `Coheyting` API is kind of awkward, because they are unfortunately quite different. One reason is that the arguments of `sup`/`inf` are often swapped in the dual version, which is not compatible with `to_dual`. I've worked around this with extensive use of `to_dual none`. There are quite some lemmas that in my eyes seem unnecessary, such as `le_sup_sdiff_sup_sdiff`, but I haven't removed any in this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	195/371	Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Notation.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Tactic/Translate/ToDual.lean	8	13	['JovanGerb', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp']	bryangingechen and mattrobball assignee:bryangingechen assignee:mattrobball	82-24378 2 months ago	86-60776 86 days ago	17-21830 17 days
35402	samueloettl author:samueloettl	feat(Dynamics/BirkhoffSum): birkhoffAverage const	--- I think this is useful and one of these should be a simp lemma. I'm not really sure if I got the naming of the theorems correct. When generalizing to the assumption (n : R) ≠ 0 instead of the special case CharZero R with n ≠ 0 I had to use "open Classical in". I'm a bit unfamiliar with that part so please check if this makes sense. See also https://github.com/leanprover-community/mathlib4/pull/35307#discussion_r2823586252 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor	22/0	Mathlib/Dynamics/BirkhoffSum/Average.lean	1	26	['Maldooor', 'github-actions', 'lua-vr', 'mcdoll', 'samueloettl']	mcdoll assignee:mcdoll	82-13656 2 months ago	19-53018 19 days ago	85-51523 85 days
31595	astrainfinita author:astrainfinita	chore: redefine `Ideal.IsPrime`	Redefine `Ideal.IsPrime` to make it correct for non-commutative cases --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	333/100	Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Noetherian.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IsPrimary.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/Ideal.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Valuation/Basic.lean	22	33	['alreadydone', 'artie2000', 'astrainfinita', 'erdOne', 'github-actions', 'leanprover-bot', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	82-2545 2 months ago	50-85601 50 days ago	59-66521 59 days
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	60	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud']	nobody	81-69421 2 months ago	427-47360 427 days ago	48-67492 48 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	81-69405 2 months ago	378-51299 378 days ago	39-60525 39 days
32825	erdOne author:erdOne	perf(RingTheory): `attribute [irreducible] KaehlerDifferential`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory	5/1	Mathlib/Algebra/Category/ModuleCat/Differentials/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyUnramified.lean,Mathlib/RingTheory/Kaehler/Basic.lean	3	7	['erdOne', 'github-actions', 'jcommelin', 'leanprover-radar', 'robin-carlier']	nobody	81-54251 2 months ago	122-57369 122 days ago	1-44258 1 day
30872	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA closure under concatenation	This PR proves that regular languages are closed under concatenation via a direct construction on `NFA`s without `εNFA` nor ε-transitions. The main new definitions and results include: - `M1.concat M2`, the concatenation of `NFA`s `M1` and `M2`, a direct construction without ε-transitions. - Theorem `accepts_concat : (M1.concat M2).accepts = M1.accepts * M2.accepts`, showing the correctness of the construction. - Theorem `IsRegular.mul`, showing that regular languages are closed under concatenation. --- - [x] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author	104/7	Mathlib/Computability/NFA.lean	1	67	['YaelDillies', 'ctchou', 'eric-wieser', 'github-actions', 'lambda-fairy', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'rudynicolop']	nobody	81-49276 2 months ago	109-32685 109 days ago	59-63565 59 days
29354	themathqueen author:themathqueen	refactor(Algebra/Algebra/Equiv): allow for non-unital `AlgEquiv`	This refactors `AlgEquiv` to allow for non-unital algebras. More specifically, we weaken the type class assumptions from: ```lean structure AlgEquiv (R A B : Type) [CommSemiring R] [Semiring A] [Semiring B] [Algebra R A] [Algebra R B] ``` to ```lean structure AlgEquiv (R A B : Type) [Add A] [Add B] [Mul A] [Mul B] [SMul R A] [SMul R B] ``` Instead of a `commutes'` field, we now have a `map_smul'` field. We also include a definition `AlgEquiv.ofCommutes` which takes in a `RingEquiv` and a `commutes'` field to match before and for convenience. `StarAlgEquiv` now extends `AlgEquiv`. We also generalize a few files to allow for non-unital. I suspect there are a few more things to generalize, but will leave this for later. Co-authored-by: Jireh Loreaux --- Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactoring.20.60AlgEquiv.60.20.28.2329354.29/with/575365792 Revives #8686. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	703/595	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/UnitaryStarAlgAut.lean,Mathlib/AlgebraicGeometry/Normalization.lean,Mathlib/AlgebraicGeometry/Stalk.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/GelfandFormula.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/Normed/Lp/Matrix.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/Composition.lean,Mathlib/Data/Matrix/DualNumber.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Notation.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/CliffordAlgebra/BaseChange.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Conjugation.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/LinearMap.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/Matrix/Unique.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/MvPolynomial.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Etale/StandardEtale.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Descent.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IntegralClosure/IntegrallyClosed.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Away/AdjoinRoot.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	130	73	['SnirBroshi', 'fpvandoorn', 'github-actions', 'jcommelin', 'leanprover-bot', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'themathqueen']	joelriou assignee:joelriou	81-46772 2 months ago	173-53208 173 days ago	65-65843 65 days
35163	CoolRmal author:CoolRmal	feat(Topology): comparison of two Hausdorff topologies	The main theorem proved in this PR is `CompactSpace.eq_of_le_compact_t2`, which says that if we have two Hausdorff topologies `s, t` on `X`, and if `t` is finer than `s` and `X` is compact under `t`, then `s = t`. I also proved some variant of this lemma. The motivations I have in mind are some applications to the theory of topological vector spaces, where we often have to compare two Hausdorff topologies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	24/0	Mathlib/Topology/Homeomorph/Lemmas.lean	1	7	['CoolRmal', 'dagurtomas', 'github-actions', 'j-loreaux', 'plp127']	nobody	81-30715 2 months ago	81-30715 81 days ago	14-53724 14 days
35746	ThomasMoulin-hub author:ThomasMoulin-hub	feat (Algebra/Endomorphisms): add kernels lemma from the missing undergraduate mathematics in mathlib	Add helper theorem inside Mathlib.Algebra.Polynomial.Smeval.lean and created a new file Mathlib/RingTheory/Polynomial/KernelDecomposition.lean that implements the kernels lemma from the missing undergraduate mathematics in mathlib list. This file also contains intermediate results needed for the main lemma.	new-contributor	75/0	Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/RingTheory/Polynomial/Basic.lean	2	2	['github-actions']	nobody	81-20845 2 months ago	unknown	0-0 0 seconds
35825	mattrobball author:mattrobball	chore: unbundle `ENormed*` from algebra	This is a test PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3609/2536	.claude/worktrees/snazzy-waddling-crescent,Archive/Hairer.lean,Archive/Imo/Imo2001Q5.lean,Archive/Imo/Imo2019Q2.lean,Archive/Wiedijk100Theorems/HeronsFormula.lean,CLAUDE.md,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/Linear.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Analytic/WithLp.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Completion.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/Analysis/Calculus/AddTorsor/Coord.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/BumpFunction/Normed.lean,Mathlib/Analysis/Calculus/BumpFunction/SmoothApprox.lean,Mathlib/Analysis/Calculus/Conformal/InnerProduct.lean,Mathlib/Analysis/Calculus/Conformal/NormedSpace.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/CPolynomial.lean,Mathlib/Analysis/Calculus/ContDiff/Comp.lean,Mathlib/Analysis/Calculus/ContDiff/Convolution.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/Deriv.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Analysis/Calculus/ContDiff/RestrictScalars.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/ContDiffHolder/Pointwise.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Shift.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/Support.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/DifferentialForm/Basic.lean,Mathlib/Analysis/Calculus/DifferentialForm/VectorField.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Affine.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Bilinear.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/CompCLM.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean	687	5	['leanprover-radar', 'mathlib-bors', 'mattrobball']	nobody	81-20694 2 months ago	81-26484 81 days ago	0-11 11 seconds
34932	erdOne author:erdOne	feat(AlgebraicGeometry): formally etale morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict delegated	163/12	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyEtale.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/RingHom/Etale.lean	5	17	['chrisflav', 'erdOne', 'github-actions', 'joneugster', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash']	nobody	81-12146 2 months ago	83-20635 83 days ago	11-40391 11 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-zulip new-contributor awaiting-author	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	42	['YaelDillies', 'dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	81-3034 2 months ago	345-32333 345 days ago	34-10092 34 days
35128	DAE123456 author:DAE123456	feat : Define anti_pascal	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	81/0	Archive.lean,Archive/Imo/Imo2018Q3.lean	2	5	['DAE123456', 'github-actions', 'grunweg', 'vihdzp']	nobody	81-560 2 months ago	96-55124 96 days ago	0-1613 26 minutes
35863	CBirkbeck author:CBirkbeck	Nagell lutz	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2005/234	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/ZSMul.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	7	0	[]	nobody	80-64028 2 months ago	unknown	0-0 0 seconds
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	please-adopt new-contributor merge-conflict modifies-tactic-syntax good first issue t-meta	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	55	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco']	nobody	80-53732 2 months ago	369-36204 369 days ago	17-14109 17 days
35603	2500223210-max author:2500223210-max	feat(GroupTheory/Frattini): add more theorems	Add some contents about frattini subgroup into Mathlib GroupTheory Frattini.lean,including * (convenient lemma)A subgroup contained in all maximal subgroup is contained in the FRattini subgroup * A subgroup (say H) has a proper complement (meaning for some proper subgroup K, K and H generate the whole group)if and only if it is not contained in the Frattini subgroup. * A group is cyclic iff its Frattini factor(the quotient group wrt Frattini subgroup) is cyclic. * The Frattini factor of a finite p-group is elementary abelian(that is,an abelian group G with Gᵖ={1}) * A finite p-group has trivial Frattini subgroup iff the group is elementary abelian. * Burnside theorem of Frattini factor of finite p-group. ---	new-contributor t-group-theory large-import awaiting-author	764/1	Mathlib/GroupTheory/Frattini.lean	1	3	['github-actions', 'tb65536']	nobody	80-51413 2 months ago	80-51413 80 days ago	5-73876 5 days
35868	Raph-DG author:Raph-DG	feat(Topology): add variant of the sheaf condition which assumes non triviality of the cover	In this PR we add in a variant of the sheaf condition which assumes the cover present in the sheaf condition is nontrivial in the sense that the indexing type is nonempty and the values of the presheaf on each element of the cover are nonempty. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	78/0	Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean	1	5	['Raph-DG', 'chrisflav', 'github-actions']	PatrickMassot assignee:PatrickMassot	80-50886 2 months ago	17-72644 17 days ago	23-50103 23 days
35078	grunweg author:grunweg	feat: immersed points	Define immersed points of a (differentiable) map between manifolds, and prove that immersed points compose. Future PRs show that `x` is an immersed point of `f` if and only if `f` is an immersion at `x`: thus, proving the composition of immersed points (which follows immediately from the chain rule) implies the composition of immersions (which is not obvious from their definition. From the path towards immersions, embeddings and submanifolds. --- - [x] depends on: #35057 - [x] depends on: #35284 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author	171/1	Mathlib.lean,Mathlib/Analysis/Normed/Module/ContinuousInverse.lean,Mathlib/Geometry/Manifold/ImmersedPoint.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	80-45386 2 months ago	97-61983 97 days ago	0-6 6 seconds
34626	grunweg author:grunweg	feat: analytification of schemes (affine case)	This branch is for tracking purposes; the code in this branch will take a while to get merged into mathlib. The affine case depends on the regular value theorem (which is a master's thesis I am supervising now), the general case will also require gluing manifolds (another thesis). Merging both before the end of this year is an optimistic estimate. That said, pieces and pre-requisites (such as, submersions, their composition properties and the definition of submanifolds) can and hopefully get merged much sooner! --- - [ ] depends on: #28796 - [ ] depends on: #26087 - [x] depends on: #34991 - [x] depends on: #35057 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR please-merge-master	3322/50	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Normed/Module/ContinuousLeftInverse.lean,Mathlib/Analysis/Normed/Module/ContinuousRightInverse.lean,Mathlib/Analysis/Normed/Module/Splits.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/Geometry/Manifold/RegularPoint.lean,Mathlib/Geometry/Manifold/RegularValueTheorem.lean,Mathlib/Geometry/Manifold/Scheme.lean,Mathlib/Geometry/Manifold/SliceModel.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean,Mathlib/Geometry/Manifold/Submanifold.lean,Mathlib/Geometry/Manifold/Submersion.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	80-45355 2 months ago	108-25480 108 days ago	0-1 1 second
33791	PhoenixIra author:PhoenixIra	feat: Generalization of FixedPointApproximants to CompletePartialOrder	--- This PR provides a generalization of FixedPointApproximants to CompletePartialOrder. Not every theorem can be generalized, as sometimes we require additional conditions (namely `x ≤ f x`) in order to guarantee that the set is directed and thus the supremum is well-defined. This is not necessary in a CompleteLattice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	223/100	Mathlib/Order/CompletePartialOrder.lean,Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean	2	21	['PhoenixIra', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	PhoenixIra and vihdzp assignee:PhoenixIra assignee:vihdzp	80-29717 2 months ago	80-29717 80 days ago	44-16098 44 days
35674	astrainfinita author:astrainfinita	refactor: use `OrderSupSet` in `ConditionallyCompleteLattice`	--- - [x] depends on: #35774 - [x] depends on: #37079 - [ ] depends on: #37082 - [ ] depends on: #38328 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR merge-conflict	421/265	Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/Int/ConditionallyCompleteOrder.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/Copy.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	20	8	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	80-29467 2 months ago	unknown	0-0 0 seconds
35669	SnirBroshi author:SnirBroshi	feat(Mathlib/Data/Finset/Mex): `sInf sᶜ ≤ s.encard`	--- It's in a separate file because I couldn't find a sensible place with the required imports, not because "mex" is particularly interesting. - [x] depends on: #35821 - [ ] depends on: #35822 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	127/2	Mathlib.lean,Mathlib/Data/Finset/Mex.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean	6	13	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	80-28252 2 months ago	81-42045 81 days ago	3-47086 3 days
35857	AlexeyMilovanov author:AlexeyMilovanov	feat(Logic.Equiv.BijectiveBase2): add bijective base-2 numeration	This PR introduces a formalization of the bijective base-2 numeration system. Unlike standard binary representation, bijective base-2 avoids the "leading zeros" problem, providing a strict mathematical bijection between natural numbers (`ℕ`) and lists of booleans (`List Bool`). Main additions: * `Equiv.BijectiveBase2.toBits`: Encodes `ℕ` to `List Bool`. * `Equiv.BijectiveBase2.ofBits`: Decodes `List Bool` to `ℕ`. * `equivBijectiveBase2`: The formal `ℕ ≃ List Bool` equivalence. --- Zulip: [#PR reviews > PR #35857: Bijective Base-2 Numeration](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration/with/576336540) Zulip: [#batteries > Upstreaming Nat.Bits](https://leanprover.zulipchat.com/#narrow/channel/348111-batteries/topic/Upstreaming.20Nat.2EBits/with/580736051) (Note: This replaces my previously closed PR to avoid the terminology clash between "Dyadic" and dyadic rationals. The namespace and definitions have been updated accordingly). (Note: Used AI to assist with standardizing proof structures).	t-logic new-contributor LLM-generated blocked-by-batt-PR	95/0	Mathlib.lean,Mathlib/Logic/Equiv/ListNatBijective.lean	2	6	['AlexeyMilovanov', 'SnirBroshi', 'github-actions', 'joneugster']	nobody	80-25788 2 months ago	52-62011 52 days ago	27-59600 27 days
35423	Rob23oba author:Rob23oba	feat: add congruence lemmas for `Function.update` and `Pi.single`	Adds `simp` congruence lemmas to `Function.update` and `Pi.single` that are specialized for the non-dependent case. See also [#mathlib4 > Simp fails to apply with `Function.update`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Simp.20fails.20to.20apply.20with.20.60Function.2Eupdate.60/with/573889929). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	29/6	Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/RepresentationTheory/Tannaka.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	5	11	['Rob23oba', 'eric-wieser', 'github-actions', 'joelriou', 'joneugster', 'loefflerd', 'mathlib-merge-conflicts']	joelriou assignee:joelriou	80-19423 2 months ago	54-80502 54 days ago	36-20932 36 days
35605	j-loreaux author:j-loreaux	feat: transfer instances of `ContinuousFunctionalCalculus` to type synonyms with weaker topologies	--- - [ ] depends on: #35551 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	730/209	Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Range.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Restrict.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Transfer.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Matrix/HermitianFunctionalCalculus.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Basic.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean	13	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	80-18815 2 months ago	83-81075 83 days ago	0-39286 10 hours
35610	IvanRenison author:IvanRenison	feat(Data/Fin): add several lemmas about subtraction of `Fin.{castLT, castAdd, castSucc, castPred}`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	79/0	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean	2	13	['IvanRenison', 'chrisflav', 'github-actions', 'robin-carlier', 'wwylele']	eric-wieser assignee:eric-wieser	80-13674 2 months ago	17-23700 17 days ago	82-54708 82 days
25170	eric-wieser author:eric-wieser	refactor: make basis computable	I claim that in the long run, `Basis.repr` should be a `DFinsupp` not `Finsupp`, so that it is computable. To make this change incrementally, we can store a `DFinsupp` internally today, and keep `repr` and `ofRepr` working with finsupp. This at least would allow building a large basis object, and then using `repr'` to compute with it. The cost of this intermediate state is a loss of many defeqs. --- - [x] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra large-import label:t-algebra$	66/21	Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	79-60617 2 months ago	unknown	0-0 0 seconds
34519	grunweg author:grunweg	feat: environment linter for definitions containing an underscore	This is almost certainly a violation of the naming convention. In the medium-term, this should become a syntax linter: at the moment, there are too many exceptions in mathlib. Making this an environment linter allows auto-generating a list of existing exceptions. We track the number of violations as a technical debt metric. --- TODO: wait for CI to rebuild mathlib, then update nolints locally [Zulip topic](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20linter/with/570617527) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter CI large-import awaiting-author merge-conflict	650/4	Mathlib/Tactic/Linter/Style.lean,MathlibTest/HashLint.lean,scripts/nolints.json,scripts/technical-debt-metrics.sh	4	28	['adomani', 'b-mehta', 'github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts', 'plp127', 'vlad902']	b-mehta and joneugster assignee:joneugster assignee:b-mehta	79-51264 2 months ago	110-42111 110 days ago	0-11960 3 hours
34050	Julian author:Julian	feat(GraphTheory): Graham-Pollak theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-author t-combinatorics merge-conflict	189/7	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/EdgeLabeling.lean,Mathlib/Combinatorics/SimpleGraph/GrahamPollak.lean	4	3	['github-actions', 'mathlib-merge-conflicts']	nobody	79-47942 2 months ago	122-49771 122 days ago	0-13 13 seconds
34963	Parcly-Taxel author:Parcly-Taxel	feat(Archive): proof of the Robbins conjecture	Cf. [#mathlib4 > Alternative axiomatization of boolean algebras @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Alternative.20axiomatization.20of.20boolean.20algebras/near/558900960) and #31924.	t-algebra awaiting-zulip label:t-algebra$	610/0	Archive.lean,Archive/Robbins.lean	2	2	['chrisflav', 'github-actions']	chrisflav assignee:chrisflav	79-41475 2 months ago	28-41450 28 days ago	71-52253 71 days
35376	michaellee94 author:michaellee94	feat(Geometry/Manifold): orientable manifolds	--- - [x] depends on: #33189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor WIP t-differential-geometry merge-conflict awaiting-author	2116/11	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/MoebiusBand.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Geometry/Manifold/Orientation.lean,Mathlib/Topology/Closure.lean	7	8	['Rida-Hamadani', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	79-19993 2 months ago	92-39439 92 days ago	0-100 1 minute
33406	dupuisf author:dupuisf	feat: add basics of majorization	This PR defines [majorization](https://en.wikipedia.org/wiki/Majorization). This is needed to develop the theory of unitarily invariant norms on `ℂ^n`, in particular Schatten norms. --- - [ ] depends on: #33394 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author WIP	752/13	Mathlib.lean,Mathlib/Analysis/Convex/Majorization/Basic.lean,Mathlib/Analysis/Convex/Majorization/Defs.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Order/Interval/Finset/Fin.lean,docs/references.bib	9	10	['dupuisf', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	79-19666 2 months ago	83-33462 83 days ago	8-27887 8 days
32374	adamtopaz author:adamtopaz	feat(Tactic/WildcardUniverse): Foo.{, _, v, max u v}	This PR creates an elaborator for syntax of the form `Foo.{, _, v, max u v}`. A `` indicates that a new universe parameter should be created, `_` and `max u v` elaborate using the existing level elaboration (so `_` elaborates to a level mvar). The syntax `v` creates a level parameter of the form `v_n` for some value of `n`. The newly created level parameters are ordered in a particular way to match the order in which they appear in the syntax. For example, in `Foo.{, _, v, max u v}`, the level parameter associated with `` will come before the other universes, including the parameter created by `v`, and the parameters `u` and `v`. Similarly the parameter associated with `v` will come after* the one for ``, and before both `u` and `v`. Note: Unlike `Category C`, where we understand exactly how the universes involved in `C` (both in the term and its type) relate to the level parameter of the morphisms, we can't expect such precise control in general. For example, when `C.{u} : Type 0`, `Category* C` places the morphism level `v_1` before `u`, but `Category.{} C` places it after `u`. In other words, `Foo.{...}` only reorders the level parameters based on the parameters that appear in the (elaborated) `...`, without any regard to the universes that appear in the arguments* to `Foo.{...}`. Co-authored-by: Claude --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author WIP LLM-generated	720/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/WildcardLevel.lean,MathlibTest/WildcardLevel.lean	4	52	['JovanGerb', 'adamtopaz', 'fpvandoorn', 'github-actions', 'leanprover-radar']	JovanGerb and dwrensha assignee:dwrensha assignee:JovanGerb	79-15811 2 months ago	97-54280 97 days ago	63-17465 63 days
35734	mkaratarakis author:mkaratarakis	feat(NumberTheory): matrix bounds and Siegel's lemma application for Gelfond-Schneider	This PR is the second component in the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem), establishing the transcendence of $\alpha^\beta$. Building on the algebraic setup from the previous PR #35733, this file establishes analytical bounds on the linear system matrix and applies Siegel's Lemma (Lemma 8.2) to extract a bounded, non-trivial integer solution vector. We establish the exact upper bounds required to construct the auxiliary integer function $R(x)$. `c₃` and Matrix Bounds (`house_matrixA_le`)*: We define the bounding constant $c_3$, which aggregates the base bounds $c_2$ and the maximal houses of the algebraic preimages $\alpha', \beta', \gamma'$. Through extensive algebraic manipulation, we formally prove that the house of the entries in our linear system matrix $A$ is strictly bounded by $c_3^n n^{(n - 1) / 2}$. Using the bounds established above, we apply `house.exists_ne_zero_int_vec_house_le` (a formalization of Lemma 8.2, p. 490) to guarantee the existence of a non-trivial vector of algebraic integers $\eta$ in the kernel of $A$. We define the solution bounding constant $c_4$ and prove the textbook bound that the house of our resulting coefficient vector $\eta$ satisfies $\forall k, \\|\eta_k\\| \leq c_4^n * n^{(n + 1) / 2}$. - [ ] depends on: #35733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory blocked-by-other-PR	872/5	Mathlib.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	78-56923 2 months ago	83-31138 83 days ago	0-306 5 minutes
33714	idontgetoutmuch author:idontgetoutmuch	feat(Mathlib/Geometry/Manifold): Riemannian metrics exist II	Supersedes https://github.com/leanprover-community/mathlib4/pull/33519 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor	680/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	3	200	['Rida-Hamadani', 'github-actions', 'grunweg', 'idontgetoutmuch']	fpvandoorn assignee:fpvandoorn	78-46105 2 months ago	29-53218 29 days ago	74-59970 74 days
34875	banrovegrie author:banrovegrie	feat(LinearAlgebra/Matrix): add Sherman-Morrison formula	Mathlib has the matrix determinant lemma (`det_add_replicateCol_mul_replicateRow` in SchurComplement.lean) but lacked the corresponding inverse formula. This PR fills that gap. - Add `Matrix.inv_add_vecMulVec`: Sherman-Morrison formula for `(A + uv^T)^{-1}` - Add `Matrix.inv_sub_vecMulVec`: subtraction variant - Add `Matrix.isUnit_det_add_vecMulVec`: invertibility under the formula's hypotheses ## Test plan - [x] `lake build` passes - [x] Lines within 100 char limit - [x] All declarations have docstrings Any specific AI usage?: Used Copilot for review purposes.	t-algebra new-contributor awaiting-author label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	14	['Xxxjdjdid', 'banrovegrie', 'chrisflav', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	chrisflav assignee:chrisflav	78-44551 2 months ago	33-41640 33 days ago	69-6728 69 days
29982	hrmacbeth author:hrmacbeth	feat: new `isolate` tactic	This PR adds a new tactic, `isolate`, which "solves for x" in an equation or relation. For example: ```lean example (a b : ℝ) (f : ℝ → ℝ) : 5 * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / 5` ``` The `isolate` tactic may generate side goals, if these are necessary to justify the transformation. The tactic will attempt to justify such side goals using `positivity` (as in the above example), unification, or type class inference, but if unsuccessful will present them to the user. For example: ```lean example (a b c : ℝ) (f : ℝ → ℝ) : c * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / c` -- second (side) new goal: `⊢ 0 < c` ``` The `isolate` tactic is extensible. Coverage may be extended to new relations and new operations-to-be-undone by tagging appropriate lemmas with the new `@[isolate]` attribute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta awaiting-author merge-conflict	943/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Isolate.lean,Mathlib/Tactic/Isolate/Core.lean,Mathlib/Tactic/Isolate/Tagging.lean,Mathlib/Tactic/Relation/Symm.lean,MathlibTest/Isolate/Heavyweight.lean,MathlibTest/Isolate/Lightweight.lean,scripts/noshake.json	12	83	['JovanGerb', 'PatrickMassot', 'Vierkantor', 'github-actions', 'hrmacbeth', 'kim-em', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	78-33829 2 months ago	46-53177 46 days ago	80-58929 80 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic): TODO needs a better title	add `card_bijOn` and `finset_subset_preimage_of_finite_image` Add `card_bijOn`: proves that for a bijection between finsets, their cardinalities are equal Add `finset_subset_preimage_of_finite_image`: constructs a finset subset preserving image cardinality Co-authored-by: Junyu Guo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data new-contributor	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	6	['Ruben-VandeVelde', 'github-actions', 'mathlib-merge-conflicts']	nobody	78-4728 2 months ago	321-70861 321 days ago	13-85893 13 days
29624	mcdoll author:mcdoll	feat(LinearAlgebra/LinearPMap): add definition of resolvent and first resolvent identity	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-author label:t-algebra$	189/9	Mathlib/LinearAlgebra/LinearPMap.lean	1	11	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'mcdoll']	kim-em assignee:kim-em	77-83146 2 months ago	174-9017 174 days ago	64-60811 64 days
28685	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the minimal-degree version of the Erdős-Stone theorem	Proves the minimal degree-version of the Erdős-Stone theorem: If `G` has a minimal degree of at least `(1 - 1 / r + o(1)) * card V`, then `G` contains a copy of a `completeEquipartiteGraph` in `r + 1` parts each of size `t`. The double-counting construction from the proof is available in `namespace ErdosStone`. --- - [x] depends on: #25843 - [x] depends on: #27597 - [x] depends on: #27599 - [x] depends on: #28443 - [x] depends on: #28445 - [x] depends on: #28446 - [x] depends on: #28447 This is the first of several pull requests towards the full Erdős-Stone(-Simonovits) theorem, hence the name of the file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	323/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	2	19	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'robin-carlier']	b-mehta assignee:b-mehta	77-79545 2 months ago	15-13807 15 days ago	75-22542 75 days
34910	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): a graph is a tree iff it's acyclic and has exactly `n - 1` edges	--- This was my white whale for quite some time. Hooray! - [x] depends on: #34907 - [ ] depends on: #34909 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	98/1	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Order/RelIso/Basic.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	77-76809 2 months ago	101-66900 101 days ago	0-796 13 minutes
35805	adrianmartir author:adrianmartir	feat(NumberTheory/Divisors): Add `infinite_setOf_divisors_iff`	This proves that the set of divisors `{ m \| m \| n }` of a natural number `n` is infinite if and only if `n` is zero. The first proof draft was by @Aristotle-Harmonic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author	10/0	Mathlib/NumberTheory/Divisors.lean	1	6	['adrianmartir', 'alexjbest', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	77-68454 2 months ago	54-47794 54 days ago	27-18698 27 days
35964	b-reinke author:b-reinke	feat(CategoryTheory/Linear): define category algebra	WIP definition of the category algebra of a linear category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory label:t-algebra$	171/0	Mathlib.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	3	2	['github-actions']	nobody	77-66759 2 months ago	77-69877 77 days ago	0-15 15 seconds
35442	dhyan-aranha author:dhyan-aranha	feat: Affine line with doubled origin counter example	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author t-algebraic-geometry	305/0	Counterexamples.lean,Counterexamples/AffineLineWithDoubledOrigin.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean	4	21	['BryceT233', 'chrisflav', 'dhyan-aranha', 'github-actions']	nobody	77-64058 2 months ago	90-52063 90 days ago	0-5488 1 hour
26942	pechersky author:pechersky	feat(RingTheory/Valuation/ValueGroupIso): isomorphism of value groups when compatible	and also to the ValuativeRel's value group by request from comment in https://github.com/leanprover-community/mathlib4/pull/26754#issuecomment-3051770901 - [ ] depends on: #26588 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26939 - [x] depends on: #26940 - [x] depends on: #26941	merge-conflict t-ring-theory t-order	299/3	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/RingTheory/Valuation/ValueGroupIso.lean	6	10	['faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'pechersky']	faenuccio assignee:faenuccio	77-60298 2 months ago	277-45708 277 days ago	10-67838 10 days
29713	jessealama author:jessealama	feat(Algebra/Homology): add Euler–Poincaré formula	This PR builds on the generalized Euler characteristic framework from #31121 to prove the Euler-Poincaré formula for chain complexes. PR #31121 defines the Euler characteristic for general homological complexes. This PR specializes those definitions to ℤ-indexed chain complexes and proves the main Euler-Poincaré theorem. ### Main result (in `EulerPoincare.lean`) * `ChainComplex.eulerChar_eq_homologyEulerChar`: For ℤ-indexed bounded chain complexes of finite-dimensional modules over a division ring, the alternating sum of chain dimensions equals the alternating sum of homology dimensions. ### Supporting lemmas The file also provides dimension lemmas generalized to arbitrary `HomologicalComplex (ModuleCat k) c` (not just ℤ-indexed chain complexes): * `HomologicalComplex.dFrom_zero_range` / `dTo_zero_range`: zero range when the target/source object is zero * `HomologicalComplex.dFrom_range_finrank_eq_d` / `dTo_range_finrank_eq_d`: range of `dFrom`/`dTo` has the same dimension as the underlying differential * `HomologicalComplex.range_dTo_le_ker_dFrom`: range of `dTo` is contained in the kernel of `dFrom` --- - [ ] depends on: #38483 (`Antiperiodic.sum_Ico_shift` and bilinear cancellation lemma) Builds on: #31121 Related to: #29639, #29643, #29646	awaiting-author t-algebra new-contributor blocked-by-other-PR label:t-algebra$	428/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Periodic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	2	26	['github-actions', 'jessealama', 'joelriou', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	77-59382 2 months ago	205-74554 205 days ago	35-45800 35 days
25740	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations): `SimplexCategoryGenRel.toSimplexCategory` is an equivalence	We use the normal forms for morphisms in `SimplexCategoryGenRel` to prove that `SimplexCategoryGenRel.toSimplexCategory` is an equivalence. We prove in order that there exists unique lifts in `SimplexCategoryGenRel` of mono (resp. epis) in `SimplexCategory`, and use this to deduce fully faithfulness of `SimplexCategoryGenRel.toSimplexCategory` thanks to the existing epi-mono factorisation in `SimplexCategory`. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [ ] depends on: #25737 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21747. Original PR: https://github.com/leanprover-community/mathlib4/pull/21747	t-algebraic-topology blocked-by-other-PR	555/2	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	77-43414 2 months ago	340-75946 340 days ago	0-2 2 seconds
35095	thorimur author:thorimur	feat: overlapping instances linter	This PR contributes a syntax linter that fires on declarations with local instances which overlap on data-carrying projections, developed as an interactive version of @JovanGerb 's environment linter for the same purpose (#33677). It is currently prohibitively expensive to run this linter in CI (see [bench results](https://radar.lean-lang.org/repos/mathlib4/commits/5a9f0ed1fe60b3a5c94880df4130b1bc1be764ed?reference=789108e1c80a056f4ccbfbc7cc1f9d40594087d3)). This linter therefore only runs interactively, in the language server. We may want a faster, compiled version to run in CI as an environment linter for a hybrid strategy. Co-authored-by: Jovan Gerbscheid --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	619/9	Mathlib.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Init.lean,Mathlib/Lean/ContextInfo.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/Lean/Message.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/OverlappingInstances.lean,MathlibTest/OverlappingInstances.lean	11	27	['JovanGerb', 'Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	nobody	77-39318 2 months ago	unknown	0-0 0 seconds
15355	adomani author:adomani	feat: MiM PR report	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	193/0	.github/workflows/monthly_pr_report.yaml,scripts/README.md,scripts/find_labels.sh	3	18	['YaelDillies', 'adomani', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	77-39101 2 months ago	unknown	0-0 0 seconds
22464	adomani author:adomani	feat(CI): declarations diff in Lean	Rewrites the `declaration_diff` script in Lean. You can see the effect of the new script in the testing branch #22497. The new CI step runs in approximately 5mins, but is separate from the `build` step. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI merge-conflict	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	8	['bryangingechen', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	77-37506 2 months ago	294-18772 294 days ago	146-23496 146 days
22648	adomani author:adomani	test: lean implementation decl diff quandle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	210/1	.github/workflows/PR_summary_lean.yml,Mathlib/Algebra/Quandle.lean,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	5	5	['adomani', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	77-37504 2 months ago	unknown	0-0 0 seconds
35096	dagurtomas author:dagurtomas	chore(CategoryTheory): reduce API duplication for concrete categories	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	186/1376	Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommBialgCat.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/Kernels.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean,Mathlib/Algebra/Category/ModuleCat/Projective.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Instances.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/CategoryTheory/Preadditive/Yoneda/Basic.lean,Mathlib/CategoryTheory/SingleObj.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/HasColimits.lean,Mathlib/Order/Category/BddDistLat.lean,Mathlib/Order/Category/BddLat.lean,Mathlib/Order/Category/BddOrd.lean,Mathlib/Order/Category/BoolAlg.lean,Mathlib/Order/Category/DistLat.lean,Mathlib/Order/Category/FinBddDistLat.lean,Mathlib/Order/Category/Frm.lean,Mathlib/Order/Category/HeytAlg.lean,Mathlib/Order/Category/Lat.lean,Mathlib/Order/Category/LinOrd.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Category/PartOrdEmb.lean,Mathlib/Order/Category/Preord.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Completion.lean,Mathlib/Topology/Category/Profinite/Basic.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Category/TopCat/EffectiveEpi.lean,Mathlib/Topology/Category/TopCat/GrothendieckTopology.lean,Mathlib/Topology/Category/TopCat/Limits/Cofiltered.lean,Mathlib/Topology/Category/TopCat/Limits/Konig.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Gluing.lean	68	2	['github-actions', 'mathlib-merge-conflicts']	nobody	77-29373 2 months ago	unknown	0-0 0 seconds
35766	DavidLedvinka author:DavidLedvinka	feat(Probability): add Monotonicity of setBernoulli on IsUpperSet		merge-conflict	254/47	Mathlib.lean,Mathlib/MeasureTheory/Measure/AEMeasurable.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/Dirac.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/Order/UpperLower/Relative.lean,Mathlib/Probability/Combinatorics/BinomialRandomGraph/Defs.lean,Mathlib/Probability/Distributions/Bernoulli.lean,Mathlib/Probability/Distributions/SetBernoulli.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/Topology/UnitInterval.lean	11	16	['DavidLedvinka', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts']	nobody	77-29360 2 months ago	unknown	0-0 0 seconds
35828	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/GradedAlgebra/Homogeneous/Hom): homogeneous algebra maps and evaluation	Define the notion of homogeneous algebra morphism between algebra maps. Prove that the evaluation of a (weighted) homogeneous multivariate polynomial at adequate elements of a graded algebra define a homogeneous algebra morphism. co-authored with @mariainesdff --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory WIP	74/0	Mathlib.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Hom.lean	3	11	['AntoineChambert-Loir', 'github-actions', 'joneugster', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	77-13634 2 months ago	37-71583 37 days ago	43-3286 43 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	14	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'mathlib-merge-conflicts', 'sgouezel']	sgouezel assignee:sgouezel	76-76596 2 months ago	251-72946 251 days ago	27-52841 27 days
30750	SnirBroshi author:SnirBroshi	feat(Data/Quot): `toSet` and `equivClassOf`	Define `toSet` which gets the set corresponding to an element of a quotient, and `equivClassOf` which gets the equivalence class of an element under a quotient. --- I found these definitions helpful when working with quotients, specifically `ConnectedComponents` of a `TopologicalSpace`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author awaiting-zulip	162/0	Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Setoid/Basic.lean	4	8	['SnirBroshi', 'TwoFX', 'eric-wieser', 'github-actions', 'linesthatinterlace', 'mathlib-merge-conflicts']	TwoFX assignee:TwoFX	76-71635 2 months ago	172-74975 172 days ago	36-69524 36 days
34015	erdOne author:erdOne	feat(AlgebraicGeometry): category of schemes affine over a base	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry delegated awaiting-author	466/11	Mathlib.lean,Mathlib/AlgebraicGeometry/AffineOver.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/SmallAffineZariski.lean,Mathlib/CategoryTheory/Sites/Hypercover/Subcanonical.lean	7	52	['chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	76-46620 2 months ago	8-72163 8 days ago	40-35668 40 days
27274	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): continuous diffeologies & D-topology-lemmas	Introduces the continuous diffeology on topological spaces and the Galois connection between it and the D-topology, and then uses it to prove a few more lemmas about the D-topology. --- Aside from being useful for defining a right adjoint of the D-topology functor later, this is a prerequisite for correctly defining coinduced diffeologies (namely in such a way that the D-topology is defeq to the coinduced topology) and thus also for most constructions of diffeological spaces. - [x] depends on: #26973 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry awaiting-author	153/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Continuous.lean	2	7	['github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'ocfnash']	nobody	76-38530 2 months ago	76-38530 76 days ago	3-44558 3 days
34120	winstonyin author:winstonyin	feat: `GroupWithZero` versions of `le` lemmas	[Zulip thread: #mathlib4 > prod_le_pow_card](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/prod_le_pow_card/with/568611481) ## Motivation Inequality lemmas such as `Multiset.prod_le_pow_card` that are true for the reals are only stated for non-negative reals. Instead of simply providing non-negativity as a proof obligation, the downstream user is forced to lift all non-negative terms to `NNReal` and then invoke the inequality lemma. This motivates duplicating lemmas that assume `[CommMonoid R] [MulLeftMono R]` to ones that assume `[CommMonoidWithZero R] [ZeroLEOneClass R] [PosMulMono R]` along with a non-negativity hypothesis. I've only included the obvious case for now. I'll carefully comb through these lemmas to ensure pairing and consistent naming. I've included here a downstream effect of this change, greatly simplifying a part of a proof. I'll record some of these here as well, but I'll move them to a separate PR at the end . ## Changes * Add `List.prod_le_pow_length₀` and `Multiset.prod_le_pow_card₀`. * Add subscript 0 to `prod_map_le_pow_card`, meaning it assumes `CommMonoidWithZero`, consistent with similar lemmas. * Remove the `FunLike` assumption in `prod_map_le_pow_length₀` and `prod_map_le_pow_card₀` * Update and shorten proof of `max_norm_root_eq_spectralValue`. ## TODO * Ensure pairing between lemmas that assume `CommMonoid` and `CommMonoidWithZero` across `List`, `Multiset`, `Finset`. * Find other such cases, e.g. `mul_lt_one`. * Ensure consistent naming using subscript 0. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import merge-conflict	662/286	Archive/Imo/Imo2025Q3.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/BigOperators/Group/Finset.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Multiset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/Monovary.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Measure/HasOuterApproxClosedProd.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/OneVariable.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/NumberTheory/SmoothNumbers.lean,Mathlib/Order/Filter/AtTopBot/Monoid.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,scripts/nolints_prime_decls.txt	54	3	['github-actions', 'mathlib-merge-conflicts']	nobody	76-22532 2 months ago	120-2265 120 days ago	0-20 20 seconds
32942	kim-em author:kim-em	feat(CategoryTheory/Monoidal/Rigid): tensor product of exact pairings	This PR adds the tensor product construction for exact pairings in rigid monoidal categories: - `ExactPairing.tensor`: Given exact pairings `(X₁, Y₁)` and `(X₂, Y₂)`, we get an exact pairing `(X₁ ⊗ X₂, Y₂ ⊗ Y₁)`. Note the reversed order in the second factor - this is essential for the monoidal structure of dual functors. - `HasRightDual.tensor` and `HasLeftDual.tensor`: If `X` and `Y` have duals, so does `X ⊗ Y` - `rightDual_tensor` and `leftDual_tensor` simp lemmas 🤖 Prepared with Claude Code	t-category-theory LLM-generated awaiting-author	103/0	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/Tactic/Linter/TextBased/UnicodeLinter.lean	1	10	['github-actions', 'joelriou', 'kim-em', 'robin-carlier']	nobody	76-13859 2 months ago	10-67710 10 days ago	3-49996 3 days
36099	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Sum): `edgeSet` equivalence	--- - [ ] depends on: #34909 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	30/0	Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Data/Sym/Sym2.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	76-1658 2 months ago	76-1659 76 days ago	0-1891 31 minutes
35157	Multramate author:Multramate	feat(RingTheory/AdjoinRoot): add IsFractionRing for AdjoinRoot	Co-authored-by: Sriram Chinthalagiri Venkata @sriram3301 This contribution was created as part of the Heidelberg Lean workshop "Formalising algebraic geometry" in November 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra awaiting-author label:t-algebra$	40/1	Mathlib/RingTheory/AdjoinRoot.lean	1	8	['copilot-pull-request-reviewer', 'erdOne', 'github-actions', 'robin-carlier']	mattrobball assignee:mattrobball	75-64675 2 months ago	66-39754 66 days ago	25-82526 25 days
29425	pechersky author:pechersky	feat(NumberTheory/Padics/Torsion): `HasEnoughRootsOfUnity ℤ_[p] (p - 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #29403 - [x] depends on: #29404 - [x] depends on: #29405 - [x] depends on: #29408 - [x] depends on: #29424 - [ ] depends on: #30989	merge-conflict awaiting-author t-ring-theory	179/0	Mathlib.lean,Mathlib/NumberTheory/Padics/Torsion.lean,Mathlib/RingTheory/ZMod/Torsion.lean	3	6	['erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'pechersky']	erdOne assignee:erdOne	75-64581 2 months ago	184-55399 184 days ago	44-24353 44 days
27980	smmercuri author:smmercuri	feat: dimensions of completions at infinite place extensions	This PR continues the work from #24853. Original PR: https://github.com/leanprover-community/mathlib4/pull/24853 --- - [x] depends on: #27977 - [ ] depends on: #27978 - [x] depends on: #27974 - [x] depends on: #27975 - [ ] depends on: #27976 - [ ] depends on: #29942 - [ ] depends on: #29946	t-number-theory blocked-by-other-PR large-import merge-conflict FLT	619/2	Mathlib.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/NumberTheory/NumberField/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Dimension.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	75-63566 2 months ago	286-60149 286 days ago	0-3752 1 hour
34138	pfaffelh author:pfaffelh	feat(MeasureTheory): Introduce `DiscreteMeasure α` giving rise to a `Measure α` as a sum of `dirac`s	Define `DiscreteMeasure α` as a structure with `weight : α → ℝ≥0∞` Define `toMeasure (w : DiscreteMeasure α) : Measure α` as a sum of diracs Show properties of the resulting objects This PR intends to start a more userfriendly interaction with discrete probability (measure) theory, in contrast to probability mass functions (`PMF`). There are two main differences between `DiscreteMeasure` and `PMF`: * Every `PMF` hast the additional property `HasSum 1`, making the resulting measure a probability measure. (For `DiscreteMeasure`, I intend to use the typeclass `IsProbabilityMeasure`in a later PR instead.) * The `toMeasure` function of `MassFunction` defines the measure as a sum of diracs, which immediately makes computations possible. Discussion thread on [zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/PMF.20Refactor.3A.20FunLike.20vs.20Definition.20Change) - depends on: #37060 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor	224/0	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/MeasureTheory/Measure/DiscreteMeasure.lean	4	27	['DavidLedvinka', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'metakunt', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	75-60826 2 months ago	28-20678 28 days ago	82-19320 82 days
35327	SnirBroshi author:SnirBroshi	feat(SimpleGraph/Acyclic): the union of two trees that share exactly one vertex is a tree	--- A surprisingly painful proof for something that seems trivial when drawing on the board. To avoid any doubts: no AI was involved whatsoever. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	95/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	10	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vbeffara', 'vlad902']	YaelDillies assignee:YaelDillies	75-50765 2 months ago	59-17285 59 days ago	33-16907 33 days
36156	vihdzp author:vihdzp	chore: use `to_additive` for `MulAut` and `AddAut`	We want to use a multiplicative structure on both, so we tag them as `to_additive_dont_translate`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	45/119	Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/Defs.lean	2	1	['github-actions']	nobody	75-23563 2 months ago	75-25291 75 days ago	0-46 46 seconds
36158	vihdzp author:vihdzp	chore: use `to_additive` for `IsConj`	I don't really need this specific definition, but I do want additive versions of other declarations that depend on this. Some proofs were changed, since `MulAut.conj` can't be dualized (the analogous def `AddAut.conj` has to insert a `Multiplicative` in there). --- - [ ] depends on: #36156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory blocked-by-other-PR merge-conflict	95/137	Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Tactic/Translate/ToAdditive.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	75-21900 2 months ago	75-21901 75 days ago	0-1731 28 minutes
36148	robin-carlier author:robin-carlier	test: make Category.assoc a pre-simp lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	83/62	Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Kernels.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Dialectica/Basic.lean,Mathlib/CategoryTheory/EffectiveEpi/Comp.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Galois/GaloisObjects.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/GuitartExact/Over.lean,Mathlib/CategoryTheory/GuitartExact/VerticalComposition.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/AbelianImages.lean,Mathlib/CategoryTheory/Limits/Shapes/Diagonal.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Connected.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Pasting.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Braided/Transport.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/MorphismProperty/Descent.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/Precoverage.lean,Mathlib/CategoryTheory/Sites/Hypercover/One.lean	31	4	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	75-12228 2 months ago	75-39671 75 days ago	0-2 2 seconds
36167	WenrongZou author:WenrongZou	feat(RingTheory/FormalGroup): construction of additive inverse of formal group	construction of additive inverse --- - [x] depends on: #35912 - [ ] depends on: #38052 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	459/7	Mathlib.lean,Mathlib/RingTheory/FormalGroup/AddInv.lean,Mathlib/RingTheory/FormalGroup/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Evaluation.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Trunc.lean	7	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	75-1507 2 months ago	33-71085 33 days ago	4-14966 4 days
36142	erdOne author:erdOne	feat(Topology): sheaves of modules in `Over U`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import awaiting-author merge-conflict	116/7	Mathlib.lean,Mathlib/CategoryTheory/Sites/Spaces.lean,Mathlib/Topology/Sheaves/Module.lean,Mathlib/Topology/Sheaves/Over.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean	5	5	['github-actions', 'joelriou', 'mathlib-merge-conflicts']	nobody	74-59528 2 months ago	75-50262 75 days ago	0-153 2 minutes
35073	joelriou author:joelriou	feat(CategoryTheory/Sites): more on Cech cohomology	WIP branch --- - [x] depends on: #35035 - [x] depends on: #35026 - [x] depends on: #35038 - [x] depends on: #35140 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	646/25	Mathlib.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Limits/FormalCoproducts/Basic.lean,Mathlib/CategoryTheory/Limits/FormalCoproducts/Cech.lean,Mathlib/CategoryTheory/Limits/FormalCoproducts/EvalOpAddCommGrpCat.lean,Mathlib/CategoryTheory/Limits/FormalCoproducts/Misc.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/CechAddCommGrpCat.lean,Mathlib/CategoryTheory/Subfunctor/Sieves.lean,Mathlib/Topology/Sheaves/Cech/AddCommGrpCat.lean	13	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-54186 2 months ago	97-66941 97 days ago	0-2 2 seconds
35136	joelriou author:joelriou	feat(AlgebraicGeometry): points of the small étale site	The main definition in this PR is `Scheme.pointSmallEtale`. Given a morphism `Spec (.of Ω) ⟶ S` where `Ω` is a separably closed field, we define the corresponding point of the small étale site of `S`. We show that these points form a conservative family. (This PR also removes the definition `Scheme.geometricFiber` which was not correct.) Co-authored-by: Christian Merten --- - [x] depends on: #35141 - [x] depends on: #35175 - [x] depends on: #35240 - [x] depends on: #34976 - [ ] depends on: #33958 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebraic-geometry blocked-by-other-PR large-import merge-conflict	1632/73	Mathlib.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/AlgebraicGeometry/Fiber.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Sites/AffineEtale.lean,Mathlib/AlgebraicGeometry/Sites/Etale.lean,Mathlib/AlgebraicGeometry/Sites/EtalePoint.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Sheaf.lean,Mathlib/CategoryTheory/Elements.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Jointly.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Connected.lean,Mathlib/CategoryTheory/Limits/FinallySmall.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/ShrinkYoneda.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/Precoverage.lean,Mathlib/CategoryTheory/Sites/LocallySurjective.lean,Mathlib/CategoryTheory/Sites/Point/Basic.lean,Mathlib/CategoryTheory/Sites/Point/Conservative.lean,Mathlib/CategoryTheory/Sites/PrecoverageToGrothendieck.lean,Mathlib/CategoryTheory/Sites/SheafOfTypes.lean,Mathlib/CategoryTheory/Sites/Types.lean,Mathlib/CategoryTheory/Types/Epimorphisms.lean,Mathlib/Topology/Sheaves/Points.lean,Mathlib/Topology/Sheaves/Sheaf.lean	29	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-47568 2 months ago	96-47053 96 days ago	0-1 1 second
34940	michaellee94 author:michaellee94	feat: the graph of a continuous function on a $C^n$ manifold is a $C^n$ manifold	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor awaiting-author merge-conflict	536/0	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Instances/Graph.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Topology/Constructions/Graph.lean	5	80	['botbaki-review', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'michaellee94', 'ocfnash']	ocfnash assignee:ocfnash	74-46856 2 months ago	76-27051 76 days ago	15-5284 15 days
35193	Brian-Nugent author:Brian-Nugent	feat(Topology/Closeds): implement category of closed sets in topological spaces	I copied over the nice API for working with `TopologicalSpace.Opens` as a category over for `TopologicalSpace.Closeds`. The only thing that did not immediately transfer was `Topology.IsInducing.functorObj` so I omitted it. Based on work of @kim-em --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor please-adopt merge-conflict awaiting-author	385/0	Mathlib.lean,Mathlib/Topology/Category/TopCat/Closeds.lean,Mathlib/Topology/Category/TopCat/Opens.lean	2	24	['Brian-Nugent', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	dagurtomas assignee:dagurtomas	74-46002 2 months ago	59-46075 59 days ago	17-64811 17 days
35332	yisiox author:yisiox	feat(Computability): regular expressions match a regular language	This PR adds a proof that the language matched by a regular expression is a regular language. This is achieved by the following constructions and proofs of their correctness - A DFA `epsilon` which accepts the empty language - A DFA `char (a : α)` which accepts the language containing only a single symbol - An Epsilon-NFA `concat (M₁ : εNFA α σ₁) (M₂ : εNFA α σ₂)` which accepts the concatenation of the languages of two Epsilon-NFAs - An Epsilon-NFA `kstar (M : εNFA α σ)` which accepts the Kleene star of a language of an Epsilon-NFA The following theorems on closure are added - `IsRegular.zero` - `IsRegular.one` - `IsRegular.top` - `IsRegular.singleton` - `IsRegular.mul` - `IsRegular.kstar` which demonstrates - `IsRegular.matches` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	475/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean	2	2	['github-actions']	nobody	74-35963 2 months ago	unknown	0-0 0 seconds
30408	kckennylau author:kckennylau	feat(RingTheory): more algebra instances for HomogeneousLocalization and linear constructors	This PR introduces the instance `Algebra R₀ (HomogeneousLocalization 𝒜 x)` as well as two linear constructors `mkₗ` and `Away.mkₗ` that fix the denominator. Zulip discussion: [#mathlib4 > Some algebra instance for graded algebra and homog loc](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Some.20algebra.20instance.20for.20graded.20algebra.20and.20homog.20loc/with/544178649) --- Split from #26061. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	65/20	Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	1	6	['github-actions', 'mariainesdff', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	74-33000 2 months ago	202-62124 202 days ago	17-72413 17 days
30431	kckennylau author:kckennylau	feat(RingTheory): a homogeneous submodule is the span of its homogeneous elements	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	22/0	Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean	2	9	['alreadydone', 'github-actions', 'kckennylau', 'mariainesdff', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	74-32999 2 months ago	196-51761 196 days ago	23-21820 23 days
35834	homeowmorphism author:homeowmorphism	feat(Mathlib/GroupTheory/PresentedGroup): every group has a presentation	We show that every group has a presentation defined by taking the free group with all of the group elements as the generators, and defining the relations as the kernel of the induced subjective homomorphism from that free group to the group itself. Use of AI: This has been vibe-coded with GPT-Codex-5.3, was updated through review, and was double-checked by the author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-group-theory large-import awaiting-author LLM-generated	29/1	Mathlib/GroupTheory/PresentedGroup.lean	1	15	['copilot-pull-request-reviewer', 'euprunin', 'github-actions', 'homeowmorphism', 'mathlib-bors', 'plp127', 'tb65536']	tb65536 assignee:tb65536	74-26177 2 months ago	74-26177 74 days ago	4-30613 4 days
33501	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Degree): degrees for infinite graphs	Define `ENat` versions of `degree`/`minDegree`/`maxDegree` called `edegree`/`minEDegree`/`maxEDegree` respectively. --- The `e` prefix matches the existing `edist` and `ediam`. I will split this PR, but first I'd like to get positive signals on the concept. TODO (future work): `tsum G.edegree = 2 * G.edgeSet.encard` and then `ENat.card V * G.minEDegree ≤ 2 * G.edgeSet.encard ≤ ENat.card V * G.maxEDegree` (can we avoid topology [somehow](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615)?) - [x] depends on: #38244 - [x] depends on: #38354 - [x] depends on: #38355 - [ ] depends on: #38356 - [ ] depends on: #38612 - [ ] depends on: #38747 Note: this PR used to be a refactor of the existing `degree`/`maxDegree`/`minDegree`, see the edits of this description. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-combinatorics blocked-by-other-PR merge-conflict awaiting-author	352/259	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Degree.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/Order/WithBot.lean	22	35	['IvanRenison', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	74-25715 2 months ago	106-75360 106 days ago	14-72041 14 days
33808	seewoo5 author:seewoo5	feat(Manifold/MFDeriv): add fun_prop to `MDifferentiable`	--- Add FunProp to `MDifferentiable`. For example, the following works (when `F'` is normed `𝕜`-algebra) ```lean example (hp : MDifferentiable I 𝓘(𝕜, F') p) (hq : MDifferentiable I 𝓘(𝕜, F') q) : MDifferentiable I 𝓘(𝕜, F') ((p * q + p - q) * q * p) := by fun_prop ``` Motivated from [sphere packing project](https://github.com/thefundamentaltheor3m/Sphere-Packing-Lean). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry merge-conflict	15/0	Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Defs.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	3	9	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'seewoo5']	nobody	74-25591 2 months ago	128-72303 128 days ago	0-43623 12 hours
36210	vbeffara author:vbeffara	feat(Combinatorics/SimpleGraph): definitions of graph contraction and graph minor	A contraction is the image of a graph through a surjective function with connected fibers, and a minor is a contraction of a subgraph. This PR shows that being a contraction is transitive, but does not show the same for minors because the proof is more involved, it will be in a subsequent PR. The definitions are in `Prop` and do not contain data, but I'm not sure if that was the right choice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	151/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Contraction.lean,Mathlib/Combinatorics/SimpleGraph/Minor.lean	3	8	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'robin-carlier', 'vbeffara']	b-mehta assignee:b-mehta	74-18533 2 months ago	20-47196 20 days ago	53-33900 53 days
34484	grunweg author:grunweg	test: debugging mfderiv_smul erws	Not meant for landing. --- - [ ] depends on: #34262 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP merge-conflict	43/0	Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	1	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	74-17031 2 months ago	111-54906 111 days ago	0-252 4 minutes
35210	kim-em author:kim-em	chore: use @[to_dual] in CompleteLattice extras and Set.Lattice	This PR uses `@[to_dual]` to auto-generate dual theorems in `Order.CompleteLattice.Lemmas`, `Order.CompleteLattice.Finset`, and `Data.Set.Lattice`, deleting hand-written dual versions. [Diff relative to previous PR](https://github.com/kim-em/mathlib4/compare/kim/to-dual-complete-lattice...kim/to-dual-complete-lattice-extras) - [ ] depends on: #35209 🤖 Prepared with Claude Code	LLM-generated merge-conflict blocked-by-other-PR	217/579	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/CompleteLattice/Finset.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Tactic/SetLike.lean	7	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-17027 2 months ago	13-70236 13 days ago	5-31322 5 days
35213	kim-em author:kim-em	chore: use @[to_dual] in ConditionallyCompleteLattice	This PR adds `@[to_dual]` annotations across all `ConditionallyCompleteLattice` files: `Defs`, `Basic`, `Indexed`, `Finset`, and `Group`. Auto-generates dual theorems and deletes hand-written versions. (Absorbs the former PR #35212.) [Diff relative to #35209](https://github.com/kim-em/mathlib4/compare/kim/to-dual-complete-lattice...kim/to-dual-ccl-extended) - [ ] depends on: #35209 - [ ] depends on: #35211 🤖 Prepared with Claude Code	merge-conflict LLM-generated blocked-by-other-PR	189/485	Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-17025 2 months ago	95-20942 95 days ago	0-963 16 minutes
35214	kim-em author:kim-em	chore: use @[to_dual] in GaloisConnection and Interval.Set.Disjoint	This PR adds `@[to_dual]` annotations to 9 theorems in `GaloisConnection/Basic.lean` and 1 in `Interval/Set/Disjoint.lean`, deleting the hand-written dual theorems that are now auto-generated. In `GaloisConnection/Basic.lean`, the entire `section SemilatticeInf` block (containing `u_inf`) is deleted since `l_sup` now generates it via `@[to_dual]`. Similarly for `u_iInf`, `u_iInf₂`, `u_sInf`, and several bounds/image lemmas. [Diff relative to #35213](https://github.com/kim-em/mathlib4/compare/kim/to-dual-ccl-extended...kim/to-dual-galois-connection) - [ ] depends on: #35213 🤖 Prepared with Claude Code	blocked-by-other-PR merge-conflict LLM-generated	204/526	Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Order.lean	8	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-17023 2 months ago	95-20941 95 days ago	0-663 11 minutes
35547	Ruben-VandeVelde author:Ruben-VandeVelde	chore: tidy various files	--- As usual, `simp`s didn't seem slow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author merge-conflict	83/117	Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/ZariskisMainTheorem.lean,Mathlib/Analysis/Complex/CoveringMap.lean,Mathlib/Analysis/Complex/MeanValue.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/PowersetCard.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/JordanChevalley.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/SubFinite.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Probability/Distributions/Cauchy.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Polynomial/Subring.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/UniqueFactorizationDomain/ClassGroup.lean,Mathlib/RingTheory/Unramified/LocalStructure.lean,Mathlib/RingTheory/ZariskisMainTheorem.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Majorized.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Algebra/MulAction.lean	32	14	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'vihdzp']	nobody	74-17016 2 months ago	87-44193 87 days ago	0-67842 18 hours
35808	xroblot author:xroblot	feat(RamificationInertia): splitting in the inertia field	--- - [ ] depends on: #35802 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-algebra merge-conflict label:t-algebra$	501/12	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Data/ZMod/QuotientRing.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/HasFiniteQuotients.lean	8	4	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	74-17000 2 months ago	81-55105 81 days ago	0-2518 41 minutes
34501	eric-wieser author:eric-wieser	chore(Data/Fintype/Induction): add a workaround for a bug in `induction`	This works around leanprover/lean4#4246, as Zulip threads frequently run up against this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta please-adopt	15/1	Mathlib/Data/Fintype/Option.lean	1	3	['github-actions', 'joneugster']	joneugster assignee:joneugster	73-69929 2 months ago	108-50272 108 days ago	2-59629 2 days
32989	kim-em author:kim-em	fix(Tactic/Simps): skip @[defeq] inference for non-exposed definitions	This PR makes `@[simps]` check whether the source definition's body is exposed before calling `inferDefEqAttr`. When the body is not exposed, we skip the `@[defeq]` inference to avoid validation errors. Without this fix, using `@[simps]` on a definition that is not `@[expose]`d produces an error like: ``` Theorem Foo_bar has a `rfl`-proof and was thus inferred to be `@[defeq]`, but validating that attribute failed: Not a definitional equality: the left-hand side ... is not definitionally equal to the right-hand side ... Note: This theorem is exported from the current module. This requires that all definitions that need to be unfolded to prove this theorem must be exposed. ``` The fix checks `(← getEnv).setExporting true \|>.find? cfg.srcDeclName \|>.any (·.hasValue)` to determine if the definition body is visible in the public scope, and only calls `inferDefEqAttr` if it is. 🤖 Prepared with Claude Code	t-meta awaiting-author LLM-generated please-adopt merge-conflict	51/3	Mathlib/CategoryTheory/Triangulated/TStructure/TruncLTGE.lean,Mathlib/Tactic/Simps/Basic.lean,MathlibTest/SimpsModule.lean	4	17	['JovanGerb', 'Vierkantor', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts']	nobody	73-67808 2 months ago	95-80876 95 days ago	37-18737 37 days
35569	goliath-klein author:goliath-klein	refactor(PiTensorProduct/{InjectiveNorm, ProjectiveNorm}): deprecate `injectiveSeminorm`	This PR: * Deprecates `PiTensorProduct.injectiveSeminorm` and supporting lemmas. * Moves the theory of `liftEquiv` from InjectiveSeminorm.lean to ProjectiveSeminorm.lean. No changes are introduced beyond adding deprecation notices, adapting docstrings, and moving material between files. The PR leaves InjectiveSeminorm.lean almost empty. A new implementation of `injectiveSeminorm`, one which reflects the common mathematical definition, is to be done. This is the third in a series of three PRs with the goal to [deprecate `PiTensorProuduct.injectiveSeminorm`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/injectiveSeminorm/with/568798633). --- - [ ] depends on: #35567 - [ ] depends on: #35568 Deprecations: - injectiveSeminorm - dualSeminorms_bounded - injectiveSeminorm_apply - norm_eval_le_injectiveSeminorm - injectiveSeminorm_le_projectiveSeminorm - injectiveSeminorm_tprod_le Preliminary work toward a reimplementation is at #33969. I've added Davood and myself to the "Authors" field, as we have now significantly refactored this module. Co-authored-by: Davood H. T. Tehrani [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict blocked-by-other-PR	290/366	Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean	3	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	73-64947 2 months ago	31-72265 31 days ago	48-40574 48 days
35548	gasparattila author:gasparattila	fix(fun_prop): do not unfold semireducible definitions in the presence of projections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	151/108	Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/Notation.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Basic.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Independence.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Mor.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/Matrix.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/LinearMapCompletion.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean,Mathlib/Topology/Algebra/Star/LinearMap.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/Path.lean,MathlibTest/fun_prop_dev.lean	22	8	['DavidLedvinka', 'JovanGerb', 'github-actions', 'j-loreaux', 'lecopivo', 'mathlib-merge-conflicts']	nobody	73-61106 2 months ago	unknown	0-0 0 seconds
8479	alexjbest author:alexjbest	feat: use leaff in CI	[Leaff](https://github.com/alexjbest/leaff) is an experimental lean-diff tool, this PR is to experiment with adding it as a CI step. --- I'm not sure yet if it is best to have this always run or only run on request (like bench). If it is always run should it post a comment or simply leave its output it the actions log (maybe as a summary object) the current iteration runs and updates a sticky comment with the latest result [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author	340/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml	4	13	['alexjbest', 'fpvandoorn', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'urkud']	nobody	73-59473 2 months ago	913-36847 913 days ago	0-26 26 seconds
13483	adomani author:adomani	feat: automatically replace deprecations	This PR introduces `lake exe update_deprecations` that uses the cache to automatically replace deprecated declarations with the corresponding un-deprecated one. The script handles namespacing, replacing a possibly non-fully-qualified, deprecated name with the fully-qualified non-deprecated name. It is also possible to use ```bash lake exe update_deprecations --mods One.Two.Three,Dd.Ee.Ff ``` to limit the scope of the replacements to the modules `One.Two.Three` and `Dd.Ee.Ff`. This is intended to be a first step in automating updates: combining this with a linter that emits appropriate warnings, the functionality of `lake exe update_deprecations` can be extended to perform more complicated updates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	18	['YaelDillies', 'adomani', 'fpvandoorn', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	73-59445 2 months ago	553-50551 553 days ago	34-80803 34 days
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	merge-conflict t-algebra t-category-theory new-contributor label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	21	['fpvandoorn', 'github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	73-59422 2 months ago	666-25446 666 days ago	4-83177 4 days
14712	astrainfinita author:astrainfinita	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	49/20	Mathlib/Algebra/Group/Nat.lean,Mathlib/Algebra/Group/ZeroOne.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/UInt.lean,Mathlib/NumberTheory/ArithmeticFunction.lean	9	26	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	73-59403 2 months ago	648-37573 648 days ago	20-15089 20 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	26	['PatrickMassot', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	73-59391 2 months ago	333-59130 333 days ago	91-68302 91 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	8/0	lakefile.lean	1	22	['YaelDillies', 'adomani', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	73-59374 2 months ago	545-13609 545 days ago	0-214 3 minutes
34650	vihdzp author:vihdzp	feat: redefine `Polynomial.toSubring` with better def-eqs	We redefine [`Polynomial.toSubring`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Polynomial/Basic.html#Polynomial.toSubring) in such a way that `(p.toSubring T _).coeff n = p.coeff n` definitionally. We then golf the API. --- - [x] depends on: #34661 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	63/73	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Ring/Subring/IntPolynomial.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/Polynomial/Subring.lean	6	15	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	73-56292 2 months ago	96-49164 96 days ago	0-80144 22 hours
28072	kckennylau author:kckennylau	feat(RingTheory/Valuation): make tactic rw_val_equiv	Co-authored by Aaron Liu and Bhavik Mehta. A tactic to rewrite relations such as `max (v₁ x) (v₁ y) * v₁ z < 1` into `max (v₂ x) (v₂ y) * v₂ z < 1` , given `h : v₁.IsEquiv v₂`. Allowed relations are `≤`, `<`, `=`, `≠`. Allowed operations are: `0`, `1`, `v₁ r`, `⁻¹`, `^` (both `ℕ` and `ℤ`), ``, `/`, `min`, `max`. Examples: ```lean example {R Γ₁ Γ₂ : Type} [Ring R] [LinearOrderedCommMonoidWithZero Γ₁] [LinearOrderedCommMonoidWithZero Γ₂] {v₁ : Valuation R Γ₁} {v₂ : Valuation R Γ₂} (h : v₁.IsEquiv v₂) {y z : R} : {x \| v₁ x ^ 2 min (v₁ y) (v₁ z) ≤ 1} = {x \| v₂ x ^ 2 * min (v₂ y) (v₂ z) ≤ 1} := by rw_val_equiv h ``` It is also possible to use `←` to rewrite in the opposite direction, and to use `at h1 h3 ⊢` to specify which hypotheses (and/or goal) to rewrite, similar to the syntax of `rw`. There is also `rwa_val_equiv` to work like `rwa`. --- Zulip: [#Is there code for X? > Tactics for comparing equivalent valuations](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Tactics.20for.20comparing.20equivalent.20valuations) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-ring-theory merge-conflict	525/34	Mathlib/RingTheory/Valuation/Basic.lean,MathlibTest/Simproc/ValEquiv.lean	2	52	['b-mehta', 'erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'pechersky', 'plp127']	erdOne assignee:erdOne	73-50461 2 months ago	184-46644 184 days ago	99-25855 99 days
33592	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	This PR picks up https://github.com/leanprover-community/mathlib4/pull/15895 and resolves the failing lemma by redefining Good symbols. --- I checked that https://github.com/leanprover-community/mathlib4/pull/13514 builds correctly when based on this build. PR for that is #33599 This is my first contribution please let me know of any changes I should outline. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-computability new-contributor	160/0	Mathlib/Computability/ContextFreeGrammar.lean	1	34	['YaelDillies', 'github-actions', 'madvorak', 'nielstron']	nobody	73-48390 2 months ago	122-76917 122 days ago	10-68503 10 days
35144	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Enriched): tensor product of enriched categories	For a braided monoidal category `V`, defines the tensor product of `V`-categories `C` and `D`, and shows that the type of `V`-functors out of the tensor product `C \times D` is equivalent to the type of "enriched bifunctors" `EnrichedBifunctor V C D`. --- This work originates from infinity-cosmos project, where it is used to formalize the notion of cotensors in an enriched category. There are some additional coherence lemmas in a braided monoidal category which have been added. Currently, line 209 violates the style guideline that terminal simp calls should not be squeezed. When I tried to replace this with a single `simp`, I get an error message: `maximum recursion depth has been reached`. Any suggestions (either with this or anything else) are greatly appreciated - thank you! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos awaiting-author	333/0	Mathlib.lean,Mathlib/CategoryTheory/Enriched/TensorProductCategory.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean	3	12	['daniel-carranza', 'emilyriehl', 'github-actions', 'joelriou', 'robin-carlier']	nobody	73-44097 2 months ago	96-33192 96 days ago	0-145 2 minutes
34236	homeowmorphism author:homeowmorphism	feat(GroupTheory/FinitelyPresentedGroup): add finitely presented groups	Formulation of finitely presented groups feat(GroupTheory/FinitelyPresentedGroup): add finitely presented groups We define the notion of `IsFinitelyPresented` with equivalent datatype notions, what it means for a subgroup to be finitely generated in the normal closure, and some instances of finitely presented groups. This started as an ItaLean2025 project. The related Zulip thread is here: https://leanprover.zulipchat.com/#narrow/channel/541885-ItaLean-2025/topic/Projects.3A.20Finitely.20Presented.20Groups/with/567565752. Use of AI: * Aristotle was used for giving a preliminary proof of some statements as this is my first contribution and I wanted to understand how to prove things; they have since been changed. * GPT-5.2 was used to generate some of the proof sub-statements for efficiency once the mathematical blueprints of the proofs have been worked out. * GPT-5.3 was used to rapidly refactor the code. Human review by PR author in-progress, but got to a point where it would be good to get external input. * GPT-5.4 was used to refactor the variables. Human PR author then rewrote the whole thing. --- - [x] depends on: #34580 - [x] depends on: #34624 - [x] depends on: #35033 - [x] depends on: #35029 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor merge-conflict blocked-by-other-PR	459/3	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	5	72	['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'grunweg', 'homeowmorphism', 'kbuzzard', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	nobody	73-42383 2 months ago	60-25276 60 days ago	0-4650 1 hour
26061	kckennylau author:kckennylau	(WIP) feat(AlgebraicGeometry): define Projective Space	This defines the projective space over a scheme, indexed by an arbitrary type. --- Zulip discussion: [#maths > Projective Space](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Projective.20Space/with/524057860) I am currently using this PR as a hub for future PR's that will be split from this PR, so it is currently WIP. - [x] depends on: #30355 - [x] depends on: #30173 - [x] depends on: #30302 - [x] depends on: #30312 - [x] depends on: #30322 - [x] depends on: #30334 - [x] depends on: #30336 - [x] depends on: #30365 - [x] depends on: #30367 - [x] depends on: #30399 - [ ] depends on: #30379 - [ ] depends on: #36226 - [ ] depends on: #30352 - [ ] depends on: #30408 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-geometry blocked-by-other-PR	2009/0	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpace.lean	2	16	['callesonne', 'erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	73-41763 2 months ago	224-20371 224 days ago	110-42892 110 days
24434	joelriou author:joelriou	feat(CategoryTheory): effectiveness of descent	(This is very much a draft, it will be split in multiple PRs later.) Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [ ] depends on: #35452 - [ ] depends on: #35393 - [ ] depends on: #35396 - [ ] depends on: #35401 - [x] depends on: #24411 - [x] depends on: #24382 - [x] depends on: #25971 - [x] depends on: #13539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	4052/66	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/BaseChange.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/Opposite.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataAsCoalgebra.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataDoublePrime.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/CategoryTheory/Sites/Descent/IsStack.lean,Mathlib/CategoryTheory/Sites/Descent/ModuleCat.lean,Mathlib/CategoryTheory/Sites/Descent/PullbackStruct.lean	19	23	['alreadydone', 'callesonne', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'yuma-mizuno']	nobody	73-40432 2 months ago	unknown	0-0 0 seconds
35151	alreadydone author:alreadydone	WIP: group scheme structure on Weierstrass curve	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebraic-geometry	620/0	Mathlib/AlgebraicGeometry/EllipticCurve/Projective/GroupScheme.lean	1	3	['github-actions', 'joelriou']	nobody	73-39694 2 months ago	unknown	0-0 0 seconds
27226	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248	awaiting-author t-combinatorics new-contributor merge-conflict	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	4	['b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'xcloudyunx']	b-mehta assignee:b-mehta	73-35490 2 months ago	280-15636 280 days ago	25-83942 25 days
29934	smmercuri author:smmercuri	feat(Field/WithAbs): the lift of a ring homomorphism from `WithAbs v` to `WithAbs w` to their completions	If `σ` is a compatible ring homomomorphism between `WithAbs v` and `WithAbs w` then this extends to a natural ring homomorphism between completions `v.Completion` and `w.Completion`. Also fix some defeq abuse in `Field/WithAbs`. --- - [x] depends on: #29969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP FLT large-import merge-conflict	41/3	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Topology/MetricSpace/Completion.lean	5	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	73-31449 2 months ago	236-68445 236 days ago	0-2230 37 minutes
33688	Citronhat author:Citronhat	feat(PMF): add expectation lemmas for Poisson PMF	This PR adds some basic results about the Poisson distribution, its `PMF`, and its expectation. New lemmas: * `poissonPMF_apply` — an unfolding lemma for `poissonPMF`. * `poissonPMFReal_mul_eq_succ_mul` — the standard recursion identity for the Poisson mass function. * `poissonPMFReal_hasSum_nmul` — shows that `fun n ↦ poissonPMFReal r n * n` has sum `r`. * `poissonPMF_tsum_nmul` — the corresponding identity at the level of the `PMF`. * `poissonPMF_coe_tsum_nmul` — the same result after coercion to `ℝ`. Both `ℝ`-valued and `ℝ≥0∞`-valued formulations are included so that these results can be used conveniently in both Lebesgue and Bochner integration contexts.	new-contributor t-measure-probability awaiting-author merge-conflict	21/0	Mathlib/Probability/Distributions/Poisson.lean	1	11	['Citronhat', 'DavidLedvinka', 'github-actions', 'mathlib-merge-conflicts', 'urkud']	urkud assignee:urkud	73-17470 2 months ago	84-32119 84 days ago	47-76876 47 days
34005	MSpill author:MSpill	feat: inverse function theorem for manifolds (concrete version)	Proves the inverse function theorem for manifolds: given manifolds $M, N$ and a $C^n$ map $f : M \to N$ whose differential is a linear isomorphism at $p \in M$, then $f$ is a local diffeomorphism at $p$, provided that both $p$ and its image are interior points. The proof proceeds in 4 main steps: 1. Define composition of partial diffeomorphisms 2. Show that the extended chart at an interior point can be restricted to an open set on which it is a partial diffeomorphism, viewing the model vector space as a manifold modelled on itself trivially 3. Use the inverse function theorem (applied to $f$ written in coordinates) to obtain a partial diffeomorphism between model vector spaces 4. Compose with chart diffeomorphisms to obtain a partial diffeomorphism between the manifolds. ------ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor merge-conflict	232/3	Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	1	12	['MSpill', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	73-17225 2 months ago	123-42738 123 days ago	0-1082 18 minutes
35602	JovanGerb author:JovanGerb	feat: replace `IsWellFounded` with `WellFounded`	This PR is an attempt to deprecate `IsWellFounded`. The reason it that it is entirely equivalent to `WellFounded`, with the only difference being that `IsWellFounded` is a class. This PR instead marks `WellFounded` as a class. What is annoying is that you sometimes want the API to use it as a class and sometimes as an explicit argument, and it's not entirely clear to me what the best compromise is: duplicating API, or just picking one form and using it. For example, `WellFounded.min`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author merge-conflict	430/474	Archive/Imo/Imo1988Q6.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/CategoryTheory/CofilteredSystem.lean,Mathlib/CategoryTheory/Subobject/ArtinianObject.lean,Mathlib/CategoryTheory/Subobject/NoetherianObject.lean,Mathlib/Computability/Partrec.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Fin/Tuple/BubbleSortInduction.lean,Mathlib/Data/Finset/Dedup.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/WellFounded.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Nat/Cast/WithTop.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Rel.lean,Mathlib/Data/Set/Finite/Lemmas.lean,Mathlib/Data/Sum/Order.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/Logic/Hydra.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Cover.lean,Mathlib/Order/Extension/Well.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Order/Minimal.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/PiLex.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/Order/RelSeries.lean,Mathlib/Order/Shrink.lean,Mathlib/Order/SuccPred/Archimedean.lean,Mathlib/Order/WellFounded.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/Order/WellQuasiOrder.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/FiniteLength.lean,Mathlib/RingTheory/Length.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/Noetherian/Basic.lean,Mathlib/RingTheory/Noetherian/Defs.lean,Mathlib/RingTheory/Polynomial/UniqueFactorization.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Defs.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Ideal.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Nat.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Rank.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Category/Profinite/Nobeling/Basic.lean,Mathlib/Topology/NoetherianSpace.lean	81	43	['JovanGerb', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	pechersky and vihdzp assignee:pechersky assignee:vihdzp	73-11677 2 months ago	52-24519 52 days ago	14-62562 14 days
34830	parabamoghv author:parabamoghv	feat(CategoryTheory/Monoidal): add definition of categorical groups	This PR defines of categorical groups, also known as coherent 2-groups, in mathlib. Motivation: Categorical groups are well-studied structures in monoidal category theory, but are not currently available in mathlib. The definitions in this PR follow the existing design patterns used for Category, MonoidalCategory, and BraidedCategory. This PR focuses on setting up the core structure and notation. Basic lemmas and further developments will be provided in a subsequent PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor WIP merge-conflict	163/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/CategoricalGroups/Basic.lean	2	27	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	73-5945 2 months ago	87-74385 87 days ago	5-13145 5 days
36275	smmercuri author:smmercuri	feat: norm for the finite adele ring of a number field	--- - [ ] depends on: #35820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	176/0	Mathlib.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	72-81625 2 months ago	73-49786 73 days ago	0-8 8 seconds
36313	SproutSeeds author:SproutSeeds	feat(Inversion): cobounded tendsto near center	Part of #5939 Add `tendsto_inversion_nhdsNE_center_cobounded` in `Mathlib/Geometry/Euclidean/Inversion/Basic.lean`, proving `Tendsto (inversion c R) (𝓝[≠] c) (Bornology.cobounded P)` for `R ≠ 0`. Tools used: Codex 5.3 extra high --- Happy to adjust naming, placement, or proof style based on maintainer preference.	t-euclidean-geometry new-contributor LLM-generated awaiting-author	42/0	Mathlib/Geometry/Euclidean/Inversion/Basic.lean	1	11	['SproutSeeds', 'euprunin', 'github-actions', 'jsm28', 'kbuzzard', 'ocfnash']	jsm28 assignee:jsm28	72-67060 2 months ago	55-63999 55 days ago	6-36700 6 days
35733	mkaratarakis author:mkaratarakis	feat: Algebraic setup and matrix coefficients for Gelfond-Schneider theorem	This PR introduces the foundational algebraic setup and coefficient bounds required for the proof of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem), which establishes that for algebraic numbers $\alpha \neq 0, 1$ and irrational algebraic $\beta$, the number $\alpha^\beta$ is transcendental. Following the contradiction argument presented in Loo-Keng Hua's "Introduction to Number Theory" (Chapter 17.9, 490 -493) Gelfond's Proof), this file constructs the common number field $K$ and sets up the scaled algebraic integers for the auxiliary linear system. This system will later be solved via Siegel's lemma (Lemma 8.2, 490, Hua). This PR is essentially the first half of page 490 in the book. The proof proceeds by assuming $\gamma = \alpha^\beta$ is algebraic, meaning $\alpha$, $\beta$, and $\gamma$ all lie in an algebraic field $K$ of degree $h$. 1. Bundles the common number field $K$, the complex embeddings, and the algebraic preimages $\alpha', \beta', \gamma'$, alongside the core hypotheses of the theorem. 2. Defines the field degree $h = [K : \mathbb{Q}]$, and bounds $m = 2h + 2$ and $n = q^2 / (2m)$ to control the dimensions of the linear system. 3. Defines $c_1$, a natural number chosen so that $c_1 \alpha$, $c_1 \beta$, and $c_1 \gamma$ are algebraic integers in $K$. We prove numerous bounding and integrality lemmas (`isIntegral_c₁α`, `isInt_β_bound`, etc.). 4. Formalizes the core algebraic coefficients $(a+b\beta)^k \alpha^{al} \gamma^{bl}$ which appear in the evaluation of the derivatives of the auxiliary function $R(x)$. 5. By scaling the system by $c_1^{n-1+2mq}$, we successfully restrict the entries of our linear system matrix `A` entirely to the ring of integers $\mathcal{O}_K$, preparing it for the application of Siegel's lemma. 6. House Bounds (`c₂`) : Establishes the foundational base integer $c_2$ to bound the absolute values of the conjugates (houses) of our coefficients. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author	416/0	Mathlib.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Basic.lean	2	19	['MichaelStollBayreuth', 'github-actions', 'mkaratarakis', 'tb65536']	tb65536 assignee:tb65536	72-65964 2 months ago	11-41375 11 days ago	44-79123 44 days
35521	grunweg author:grunweg	feat: the unusedSetOptionIn linter (rebased)	Rebased version of #13653, adapted to current mathlib master. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-linter large-import	201/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/UnnecessarySetOptionIn.lean,MathlibTest/UnnecessarySetOptionIn.lean	6	2	['github-actions']	nobody	72-56179 2 months ago	88-73745 88 days ago	0-23 23 seconds
35178	grunweg author:grunweg	chore: split `T%` elaborator into its own file and move to `Topology`	TODO: this currently breaks the tangentspace case, need to rewrite it to avoid match_expr! --- - [x] depends on: #35176 - [x] depends on: #30463 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	173/0	Mathlib.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean,Mathlib/Topology/FiberBundle/Notation.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	72-56101 2 months ago	95-63226 95 days ago	0-1 1 second
34262	grunweg author:grunweg	feat: add mfderiv_const_smul	This generalises an existing mathlib lemma (as the differentiability hypothesis is in fact not necessary). Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- Note: this PR is now lower-priority (after some reorgs it is no longer on the path to the Levi-Civita connection); it should be rewritten following the approach in #34263. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry WIP	16/0	Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	1	9	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash']	ocfnash assignee:ocfnash	72-43732 2 months ago	116-40407 116 days ago	0-1122 18 minutes
36323	SproutSeeds author:SproutSeeds	feat(Inversion): discontinuity and center/global fderiv formulas	Part of #5939 Adds the discontinuity-at-center lemma for inversion and derives the center/global `fderiv` formulas from it. This draft currently builds on the preceding cobounded-tendsto lemma from #36313 while that earlier slice is under review. Scope is limited to `Mathlib/Geometry/Euclidean/Inversion/Calculus.lean`. Tools used: Codex 5.3 extra high --- Happy to adjust naming, placement, or proof style based on maintainer preference.	t-euclidean-geometry new-contributor LLM-generated	65/0	Mathlib/Geometry/Euclidean/Inversion/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean	2	2	['github-actions']	nobody	72-43271 2 months ago	unknown	0-0 0 seconds
36326	Arnav-panjla author:Arnav-panjla	Feat/gaussian schwartz map	feat(Analysis/SpecialFunctions/Gaussian): define the Gaussian as a Schwartz function in 1D Define the Gaussian function `x ↦ exp (-x^2)` as a `SchwartzMap` in the one-dimensional case. The proof establishes the Schwartz decay conditions by showing that polynomially weighted expressions of the form `(1 + x^2)^m * exp (-x^2)` are bounded. This allows the Gaussian to be packaged using the `SchwartzMap` API. During the implementation a few adjustments were required to match the current Mathlib API. In particular: * replace the non-existent `IsBigO.mul_right` with `IsBigO.of_bound` applied to the full product `(1 + x^2)^m * exp (-x^2)` * fix `mem_cocompact` usage by replacing `(hh_tendsto.eventually ...).mem_cocompact` with `mem_cocompact.mp (hh_tendsto ...)` * adjust the `hb_bound` step using `gcongr` with exact bounds so that both goals close * remove the unused declaration `hf_nonpos` * register the required import in `Mathlib.lean` This implements the one-dimensional case mentioned in the issue. The generalization to Gaussians associated with arbitrary positive-definite bilinear forms can be added in a follow-up PR. Closes #33072	t-analysis new-contributor	235/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/SchwartzMap.lean	2	4	['CoolRmal', 'github-actions']	nobody	72-36598 2 months ago	72-40009 72 days ago	72-40002 72 days
36333	thorimur author:thorimur	test: checkTypeEvenMore	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import	35/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	72-31711 2 months ago	unknown	0-0 0 seconds
30579	smmercuri author:smmercuri	feat : `v.adicCompletionIntegers K` is compact when `K` is a number field	--- - [x] depends on: #30576 - [x] depends on: #33484 - [x] depends on: #33594 - [ ] depends on: #34045 - [x] depends on: #36067 - [x] depends on: #36137 - [x] depends on: #36184 - [x] depends on: #36492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	362/11	Mathlib.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/LiesOverInstances.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	9	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	72-20389 2 months ago	215-58297 215 days ago	0-13 13 seconds
35215	kim-em author:kim-em	chore: use @[to_dual] in FixedPoints	This PR adds `@[to_dual]` annotations to 14 theorems about `lfp` in `Order/FixedPoints.lean`, auto-generating their `gfp` duals and deleting the hand-written versions. Also registers `OrderHom.lfp` as the dual of `OrderHom.gfp` via `attribute [to_dual existing]`. Auto-generated duals include: `le_gfp`, `gfp_le_fixed`, `gfp_le`, `gfp_le_map`, `map_gfp`, `isFixedPt_gfp`, `map_le_gfp`, `isGreatest_gfp_le`, `isGreatest_gfp`, `gfp_induction`, `map_gfp_comp`, `gfp_gfp`, `map_inf_fixedPoints_le`, `map_sInf_subset_fixedPoints_le`. [Diff relative to #35208](https://github.com/kim-em/mathlib4/compare/kim/to-dual-bounds-basic...kim/to-dual-fixed-points) - [x] depends on: #35208 🤖 Prepared with Claude Code	LLM-generated merge-conflict	249/548	Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Order.lean	8	11	['JovanGerb', 'github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	alexjbest assignee:alexjbest	72-13666 2 months ago	59-43067 59 days ago	24-14816 24 days
35951	parabamoghv author:parabamoghv	feat(CategoryTheory/Monoidal): evaluation coevaluation isomorphisms	This PR adds four features to rigid categories: 1. `coevaluation_evaluation` and `evaluation_coevaluation` as isomorphism equalities: Using `IsIso` instances for the `evaluation` and `coevaluation` morphisms, we promote the morphism equalities to isomorphism equalities. 2. `ExactPairing Y X` from `ExactPairing X Y`: Using an exact pairing and `IsIso` instances for both `evaluation` and `coevaluation`, we swap the exact pairing by inverting the evaluation and coevaluation morphisms. Any suggestions for the definition name are welcome. Right now it is `ExactPairing.Symm`. The second choice was `ExactPairing.Swap`. 3. `HasLeftDual X` from `HasRightDual X`: Using a `HasRightDual X` instance and relevant `IsIso` instances, we construct a left dual. Similar construction for the other way. 4. `LeftDual` isomorphic to `RightDual`: Using relevant `IsIso` instances, we provide the isomorphism from the left dual of an object to the right dual. This can be achieved in two ways: either by using `leftDualIso` or using `rightDualIso`. We will prove in a subsequent PR that both these isomorphisms are equal. Motivation: This is part of an effort to formalize CategoricalGroups, which can be defined as right rigid groupoids. The approach is motivated by the discussion in [#34830](https://github.com/leanprover-community/mathlib4/pull/34830). Any comments or suggestions are welcome, especially about the naming. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	45/0	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	71-71777 2 months ago	60-39312 60 days ago	7-83579 7 days
36203	mattrobball author:mattrobball	chore(Order.WithBotTop): make `coe` an `abbrev`	Currently `WithBotTop.coe` is a `def` when the whole type is an `abbrev`. This blocks reduction unnecessarily so we make `coe` an `abbrev`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	1/1	Mathlib/Order/WithBotTop.lean	1	2	['JovanGerb', 'github-actions']	nobody	71-58332 2 months ago	74-51240 74 days ago	74-51233 74 days
36165	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.strongRec(On)'`	In favour of Batteries's `Nat.strongRec` for definitions and `Nat.strong_induction_on` for proofs.	t-data merge-conflict	34/66	Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Factorization/Induction.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	8	6	['JovanGerb', 'MichaelStollBayreuth', 'Parcly-Taxel', 'Vierkantor', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	71-57997 2 months ago	59-43057 59 days ago	15-53464 15 days
35069	A-M-Berns author:A-M-Berns	feat(Geometry/Polygon): simple polygons and boundary map	This PR introduces Simple polygons with the predicate `IsSimple`, which captures the idea of a non-self-intersecting boundary, in the file Simple.lean. In the file Boundary.lean, a boundary map from `AddCircle n` is defined. I prove that the range of this map is the boundary and that this map is injective if and only if the polygon is simple. I kept Boundary.lean and Simple.lean separate because future results will include stuff just about the boundary map independent of simplicity (e.g. that it is continuous in the appropriate setting) and stuff just about simple polygons independent of the boundary map (e.g. that for n = 3, IsSimple iff HasNondegenerateVertices.) I used Claude Code to help generate some of the proof material, but I golfed and edited all AI contribution. - [x] depends on: #34598 ---	new-contributor t-euclidean-geometry LLM-generated	360/0	Mathlib.lean,Mathlib/Geometry/Polygon/Boundary.lean,Mathlib/Geometry/Polygon/Simple.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean	4	30	['A-M-Berns', 'eric-wieser', 'github-actions', 'joneugster', 'jsm28', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele']	eric-wieser assignee:eric-wieser	71-1778 2 months ago	82-39524 82 days ago	84-73803 84 days
29774	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Order of vanishing of elements of the function field of locally noetherian, integral schemes	In this PR, we define the order of vanishing of elements of the function field of locally noetherian, integral schemes at points of codimension 1. This is essentially just a wrapper around the API for the order of vanishing for rings (i.e. Ring.ord and Ring.ordFrac), but I think it's good to have this too for usability. --- - [ ] depends on: #29550 - [ ] depends on: #26735 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry file-removed blocked-by-other-PR	762/2	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean	7	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	70-68780 2 months ago	20-79578 20 days ago	20-80768 20 days
36364	Bergschaf author:Bergschaf	feat(Order/Sublocale): Better API for NucleusIsoSublocale	I propose defining the conversion from Nuclei to Sublocales (and vice versa) directly in the `NucleusIsoSublocale` OrderIso. `Nucleus.toSublocale` and `Sublocale.toNucleus` will then just be abbrev's for the underlying OrderIso. This makes it a lot nicer to transition between the two Structures, especially when (infinite) infima and suprema are involved. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	46/33	Mathlib/Order/Sublocale.lean	1	4	['Bergschaf', 'Vierkantor', 'YaelDillies', 'github-actions']	bryangingechen and pechersky assignee:bryangingechen assignee:pechersky	70-56857 2 months ago	49-19882 49 days ago	22-25229 22 days
33864	Timeroot author:Timeroot	feat(Computability/Primrec): Proving several Nat arithmetic functions are primrec	Prove that gcd, lcm, coprimality, divisiblity, primality, factorial, descending factorial, powers, and various logarithms are all primitive recursive. Co-authored-by: Aristotle Harmonic <[aristotle-harmonic@harmonic.fun](mailto:aristotle-harmonic@harmonic.fun)>	large-import t-computability merge-conflict	195/4	Mathlib.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/Primrec/List.lean,Mathlib/Computability/Primrec/Nat.lean,Mathlib/Data/Nat/Log.lean	5	7	['eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	70-46544 2 months ago	48-54452 48 days ago	47-19946 47 days
33668	Citronhat author:Citronhat	feat(PMF): add lintegral formulas for PMF	This PR introduces two lemmas describing the `lintegral` of a function with respect to the measure induced by a probability mass function: - `PMF.lintegral_eq_tsum` - `PMF.lintegral_eq_sum` These are the `ℝ≥0∞` analogues of the existing Bochner `integral` formulas `integral_eq_tsum` and `integral_eq_sum`. They could be useful for reasoning about expectations and integrability. In addition, the proof of `integral_eq_sum` is simplified by deriving it directly from `integral_eq_tsum` using `tsum_fintype`.	t-measure-probability new-contributor awaiting-author merge-conflict	14/5	Mathlib/Probability/ProbabilityMassFunction/Integrals.lean	1	3	['DavidLedvinka', 'github-actions', 'mathlib-merge-conflicts']	nobody	70-30400 2 months ago	76-65143 76 days ago	55-73479 55 days
34040	Ruben-VandeVelde author:Ruben-VandeVelde	feat: generalize HasCompl.compl image/preimage lemmas to Involutive	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author merge-conflict	23/14	Mathlib/Data/Set/Image.lean	1	6	['eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	eric-wieser assignee:eric-wieser	70-29834 2 months ago	108-42532 108 days ago	14-12127 14 days
34246	staroperator author:staroperator	feat(SetTheory/Cardinal): Δ-system lemma	We prove the Δ-system lemma, which says for any regular cardinal `θ` and infinite cardinal `κ < θ`, if `∀ c < θ, c ^< κ < θ`, any `θ`-sized family of sets whose cardinalities are less than `κ` must contain a `θ`-sized Δ-system (this condition is called Δ-system property for `θ` and `κ`, noted as `Δ(θ, k)`). As a special case, `Δ(ℵ₁, ℵ₀)` ensures any uncountable family of finite sets must contain an uncountable Δ-system. --- - [ ] depends on: #37685 - [ ] depends on: #38266 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR large-import merge-conflict	384/0	Mathlib.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Club.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean,Mathlib/Order/LatticeIntervals.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/DeltaSystem.lean,Mathlib/SetTheory/Cardinal/Pigeonhole.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,docs/references.bib	6	11	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	70-29833 2 months ago	70-29833 70 days ago	15-9493 15 days
35317	mkaratarakis author:mkaratarakis	feat: lemmas for the analytic part of the proof of the Gelfond–Schneider theorem (Part 5/5)	If a function `R : ℂ → ℂ` factors as `R z = (z - z₀) ^ r * R₁ z`, where `R₁` is analytic everywhere, then for any `k ≤ r`, there exists an everywhere analytic function `R₂ : ℂ → ℂ` such that the `k`-th iterated derivative of `R` is given by `deriv^[k] R z = (z - z₀) ^ (r - k) * (r! / (r - k)! * R₁ z + (z - z₀) * R₂ z)`. This lemma is necessary for the proof of the Gelfond-Schneider theorem in subsequent PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor t-analysis awaiting-author	62/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	25	['MichaelStollBayreuth', 'github-actions', 'loefflerd', 'mkaratarakis']	loefflerd assignee:loefflerd	70-28365 2 months ago	48-26558 48 days ago	26-7106 26 days
35349	RemyDegenne author:RemyDegenne	feat: data processing inequality for the Kullback-Leibler divergence	--- - [x] depends on: #34841 - [x] depends on: #35089 - [x] depends on: #27953 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-measure-probability merge-conflict blocked-by-other-PR large-import	686/1	Mathlib.lean,Mathlib/InformationTheory/KullbackLeibler/DataProcessing.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean	6	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	70-26225 2 months ago	92-52370 92 days ago	0-1 1 second
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta please-adopt WIP	123/4	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CheckEqualities.lean,Mathlib/Tactic/Common.lean,MathlibTest/check_equalities.lean	7	21	['adomani', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	70-13679 2 months ago	56-61536 56 days ago	32-12136 32 days
25983	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Scheme): define the affine scheme associated to an elliptic curve	This contribution was created as part of the AIM workshop "Formalizing Algebraic Geometry" in June 2024. Co-authored-by: Michael Stoll [Michael.Stoll@uni-bayreuth.de](mailto:Michael.Stoll@uni-bayreuth.de) Co-authored-by: Junyan Xu [junyanxu.math@gmail.com](mailto:junyanxu.math@gmail.com) --- - [ ] depends on: #36086 - [ ] depends on: #36146	t-algebraic-geometry blocked-by-other-PR	165/13	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Scheme.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/GroupTheory/GroupExtension/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	15	10	['MichaelStollBayreuth', 'Multramate', 'github-actions', 'mathlib-dependent-issues']	nobody	70-13678 2 months ago	48-46781 48 days ago	25-3959 25 days
36387	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): parameter uniqueness for quadratic fields	## Summary Prove that every quadratic field `ℚ(√d)` can be normalized to have a squarefree integer parameter, and that this parameter is unique. ## Main Results - `Qsqrtd.rescale`: rescaling isomorphism `ℚ(√d) ≃ₐ[ℚ] ℚ(√(a²d))` for `a ≠ 0` - `Qsqrtd_iso_int_param`: every `ℚ(√d)` is isomorphic to one with an integer parameter - `Qsqrtd_iso_squarefree_int_param`: every `ℚ(√d)` is isomorphic to one with a squarefree integer parameter - `Qsqrtd.param_unique`: if `ℚ(√d₁) ≃ₐ[ℚ] ℚ(√d₂)` with both `d₁, d₂` squarefree and `≠ 1`, then `d₁ = d₂` ## Helper Lemmas - `squarefree_eq_of_rat_sq_mul`: if `d₁ = d₂ · r²` with both squarefree, then `d₁ = d₂` - `int_dvd_of_ratio_square`: if `d₁/d₂` is a rational square and `d₂` is squarefree, then `d₂ ∣ d₁` - `not_isSquare_neg_one_rat`: `-1` is not a square in `ℚ` --- - [ ] depends on: #36347	WIP t-number-theory blocked-by-other-PR new-contributor large-import LLM-generated	400/0	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Defs.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/NumberTheory/QuadraticField/Basic.lean	4	4	['FrankieeW', 'github-actions', 'mathlib-dependent-issues']	nobody	70-7007 2 months ago	71-1277 71 days ago	0-2 2 seconds
34464	Komyyy author:Komyyy	refactor(Topology/Order/LowerUpperTopology): use `to_dual`	--- Many files should be also dualized for this file... - [x] depends on: #33964 - [x] depends on: #34465 - [x] depends on: #34640 - [x] depends on: #36969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-order merge-conflict	42/50	Mathlib/Topology/Order/LowerUpperTopology.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	69-73403 2 months ago	unknown	0-0 0 seconds
35249	themathqueen author:themathqueen	feat(Analysis/Matrix): linear functional on matrices is positive iff its weight is positive semi-definite	No comments yet, I'm still thinking of the best thing to do here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict	167/60	Mathlib.lean,Mathlib/Analysis/Matrix/GNS.lean,Mathlib/Analysis/Matrix/Order.lean	3	6	['github-actions', 'mathlib-merge-conflicts']	nobody	69-73399 2 months ago	unknown	0-0 0 seconds
36128	grunweg author:grunweg	Levicivita minimal	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry merge-conflict	4220/30	Mathlib.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/LeviCivita.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Prelim.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Torsion.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/plan.mde,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/Misc.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean	13	3	['github-actions', 'mathlib-merge-conflicts']	nobody	69-73382 2 months ago	75-58773 75 days ago	0-3 3 seconds
36219	gasparattila author:gasparattila	chore(Order/SupClosed): use `to_dual`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	86/217	Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/SupClosed.lean	6	6	['github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	69-61482 2 months ago	33-41803 33 days ago	37-46007 37 days
36442	SnirBroshi author:SnirBroshi	feat(Data/Sym/Sym2/Card): cardinality theorems about `Sym2 α`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	95/0	Mathlib.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Sym/Sym2/Card.lean	2	20	['SnirBroshi', 'eric-wieser', 'github-actions', 'joneugster', 'themathqueen']	joneugster assignee:joneugster	69-49200 2 months ago	17-68112 17 days ago	38-13299 38 days
35744	mkaratarakis author:mkaratarakis	feat(NumberTheory): non-vanishing derivative and algebraic lower bound for Gelfond-Schneider	This PR continues the formalization of the Gelfond-Schneider Theorem (Hilbert's Seventh Problem). It establishes the critical algebraic lower bound for the auxiliary function's evaluation by isolating its first non-vanishing derivative and scaling it to a non-zero algebraic integer. Following the contradiction argument in Loo-Keng Hua's Introduction to Number Theory (Chapter 17.9, Equation 5), we extract the minimal non-vanishing derivative order $r$ and prove the integrality of its scaled evaluation to establish a strict analytical lower bound. 1) Confirms that by our previous choice of coefficients $\eta$, the first $n$ derivatives of the auxiliary function $R(x)$ vanish at the evaluation points $1, \dots, m$. 2) Extracts the exact minimal order of vanishing $r$ among all points $l_0 + 1$, explicitly proving the textbook assertion that $n \le r$. 3) Defines the non-zero algebraic number $\rho = (\log \alpha)^{-r} R^{(r)}(l_0)$. 4) Formalizes the crucial algebraic step that scaling the evaluated system coefficients by $c_1^{r+2mq}$ (formalized here as `cρ`) clears all denominators, resulting in an algebraic integer strictly within $\mathcal{O}_K$. 5) Concludes that because the scaled $\rho$ is a non-zero algebraic integer, its absolute norm is strictly bounded below by $1$. This establishes the algebraic foundation for the absolute lower bound $\|N(\rho)\| > c_5^{-r}$, which will directly oppose the complex analytic upper bound via Cauchy's integral formula in the final contradiction step. --- - [ ] depends on: #35316 - [ ] depends on: #35743 - [ ] depends on: #35315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	2028/0	Mathlib.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlgSetup.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAnalytic.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainOrder.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainPostAnalytic.lean	6	2	['github-actions', 'mathlib-dependent-issues']	nobody	69-48503 2 months ago	83-7868 83 days ago	0-665 11 minutes
36406	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Matching): `#verts = 2 * #edgeSet`	--- - [ ] depends on: #36442 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	122/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Data/Sym/Sym2/Card.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	69-44828 2 months ago	69-44830 69 days ago	0-79432 22 hours
36015	mcdoll author:mcdoll	chore(Analysis/SchwartzMap): unify style for `mkCLM` uses	Avoid using `refine` for definitions in favour of `where finally` and unify the indentation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	86/85	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Deriv.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean	2	9	['github-actions', 'j-loreaux', 'mcdoll']	j-loreaux assignee:j-loreaux	69-40705 2 months ago	62-30050 62 days ago	9-43106 9 days
25978	Bergschaf author:Bergschaf	feat(Order/Sublocale): Open Sublocales	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #25089 - [ ] depends on: #36364	t-order blocked-by-other-PR	152/33	Mathlib/Order/Sublocale.lean	1	12	['Bergschaf', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	69-39803 2 months ago	72-64823 72 days ago	0-74795 20 hours
34164	Scarlett-le author:Scarlett-le	feat(Geometry/Euclidean/Sphere): define arcs on spheres	This PR defines arcs on spheres and proves basic properties. ## Main definitions * `EuclideanGeometry.Sphere.Arc`: An arc on a sphere, defined by a left endpoint and a midpoint on the sphere. The right endpoint is computed as the reflection of left across the line through the center and mid. * `Arc.opposite`: The opposite arc (same endpoints, antipodal mid). * `Arc.oppositeEquiv`: The involution given by `opposite`. * `Arc.minor` / `Arc.major`: The minor/major arc between two non-diametrically-opposite points. * `Arc.through`: The arc from `A` to `C` passing through `B`. * `Arc.avoiding`: The arc from `A` to `C` not passing through `B`. ## Main results * `through_right` / `avoiding_right`: The right endpoint equals `C`. * `mem_interior_through` / `mem_through`: `B` lies in the `through` arc. * `not_mem_avoiding`: `B` does not lie in the `avoiding` arc (when `A ≠ C`). ## Dependencies * #36241 * #35956 * #35957	awaiting-author t-euclidean-geometry merge-conflict	767/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Geometry/Euclidean/Sphere/Arc.lean,Mathlib/Geometry/Euclidean/Sphere/Basic.lean,Mathlib/Geometry/Euclidean/Sphere/OrthRadius.lean	6	11	['Scarlett-le', 'github-actions', 'jsm28', 'mathlib-merge-conflicts']	nobody	69-28352 2 months ago	118-29662 118 days ago	0-46829 13 hours
35058	GrigorenkoPV author:GrigorenkoPV	chore: move tendsto_{floor,ceil}_at{Top,Bot}	Moves: - Topology.Algebra.Order.Floor.tendsto_floor_atTop -> Order.Filter.AtTopBot.Floor.tendsto_floor_atTop - Topology.Algebra.Order.Floor.tendsto_floor_atBot -> Order.Filter.AtTopBot.Floor.tendsto_floor_atBot - Topology.Algebra.Order.Floor.tendsto_ceil_atTop -> Order.Filter.AtTopBot.Floor.tendsto_ceil_atTop - Topology.Algebra.Order.Floor.tendsto_ceil_atBot -> Order.Filter.AtTopBot.Floor.tendsto_ceil_atBot --- Tracked in #7987 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import awaiting-author	22/25	Mathlib/Order/Filter/AtTopBot/Floor.lean,Mathlib/Topology/Algebra/Order/Floor.lean	2	3	['GrigorenkoPV', 'github-actions', 'j-loreaux']	nobody	69-22228 2 months ago	69-22228 69 days ago	27-45743 27 days
31670	edwin1729 author:edwin1729	feat(Topology/Order): Scott Topology is Sober over Algebraic DCPO	--- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20Algebraic.20complete.20partial.20order.20and.20domain.20theory/with/536359313) here (2/2) PR to prove result in Stone Duality. Here we prove that Scott Topologies over Algebraic DCPOs are sober. - [ ] depends on: #31662 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR new-contributor merge-conflict	510/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	69-20110 2 months ago	unknown	0-0 0 seconds
32210	ADedecker author:ADedecker	feat: iteratedFDeriv as a linear map on test functions	Add `TestFunction.iteratedFDeriv[WithOrder]LM`, analogous to [ContDiffMapSupportedIn.iteratedFDerivWithOrderLM](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.html#ContDiffMapSupportedIn.iteratedFDerivWithOrderLM) and [ContDiffMapSupportedIn.iteratedFDerivLM](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.html#ContDiffMapSupportedIn.iteratedFDerivLM) --- Co-authored-by: @luigi-massacci [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict	157/88	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean	2	7	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	grunweg, j-loreaux, sgouezel, urkud assignee:urkud assignee:j-loreaux assignee:grunweg assignee:sgouezel	69-17206 2 months ago	153-29039 153 days ago	9-42804 9 days
33329	mcdoll author:mcdoll	feat(Analysis): Fourier-based Sobolev spaces	We define Sobolev spaces (or Bessel potential spaces). --- - [x] depends on: #33242 - [x] depends on: #32769 - [x] depends on: #33404 - [x] depends on: #33597 - [x] depends on: #33636 - [x] depends on: #33741 - [x] depends on: #33751 - [x] depends on: #33752 - [x] depends on: #33776 - [x] depends on: #33859 - [x] depends on: #34027 - [x] depends on: #34099 - [x] depends on: #34100 - [x] depends on: #34294 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict	506/0	Mathlib/Analysis/Distribution/Sobolev.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean	2	8	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	69-16400 2 months ago	143-12380 143 days ago	0-1 1 second
35877	yoh-tanimoto author:yoh-tanimoto	feat(Algebra/Module): add twisted product module	add a module structure on the product `E × F` with the `SMul` given by `s • ⟨x, y⟩ := ⟨s • x, σ s • y⟩` with `σ : R →+* S`. motivation: needed to define the graph of antilinear operator, see [discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60SemilinearPMap.60/with/576208198), which will be needed in the Tomita-Takesaki theory cf. #29251	t-algebra label:t-algebra$	279/0	Mathlib.lean,Mathlib/Algebra/Module/SemilinearModuleProd.lean	2	1	['github-actions']	nobody	69-14268 2 months ago	unknown	0-0 0 seconds
30379	kckennylau author:kckennylau	feat(RingTheory): isomorphism of graded rings	We define `GradedRingEquiv 𝒜 ℬ` to mean isomorphisms of graded rings, with notation `𝒜 ≃+ᵍ ℬ`. When possible, instead of parametrizing results over `(e : 𝒜 ≃+ᵍ ℬ)`, you should parametrize over `[GradedEquivLike E 𝒜 ℬ] [RingEquivClass E A B] (e : E)`. Zulip discussion: [How to define graded ring isomorphisms?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/How.20to.20define.20graded.20ring.20isomorphisms.3F/with/543962394) --- Split from #26061. - [x] depends on: #30355 - [x] depends on: #30312 - [x] depends on: #30367 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	447/1	Mathlib.lean,Mathlib/RingTheory/GradedAlgebra/RingEquiv.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	3	7	['erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	69-13672 2 months ago	65-26824 65 days ago	9-26522 9 days
31135	kckennylau author:kckennylau	feat(RingTheory): is localization iff is localization on saturation	In this PR we show that `A` is a localization of `R` on the submonoid `S` iff it is so on the saturation of `S`. Crucially, the saturation of `S` is precisely the elements that become a unit in `A`. --- - [x] depends on: #31132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory delegated	53/0	Mathlib.lean,Mathlib/RingTheory/Localization/Saturation.lean	2	15	['alreadydone', 'chrisflav', 'github-actions', 'kckennylau', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	chrisflav assignee:chrisflav	69-13671 2 months ago	41-67206 41 days ago	32-67213 32 days
35812	khwilson author:khwilson	feat(MeasureTheory/Group/GeometryOfNumbers): successive minima and existence of a directional basis	Define the successive minima of a discrete subgroup of a real vector space with respect to a convex set. These invariants show up throughout the geometry of numbers and are the focus of Minkowski's Second Theorem (whose statement is left here with a `proof_wanted`). Note: The key lemma is that the "gauge set" of the convex set is closed. I took the approach of showing that it is sequentially closed. There's an alternative approach via showing it's the union of a finite number of closed sets. I personally thought this approach was more intuitive, but the union approach may result in a slightly shorter proof. Co-authored-by: Yaël Dillies --- - [x] depends on #37738 - [x] depends on #37740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	392/33	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean	6	32	['Vierkantor', 'YaelDillies', 'github-actions', 'joneugster', 'khwilson', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	69-13665 2 months ago	42-4173 42 days ago	36-18181 36 days
36463	AlexeyMilovanov author:AlexeyMilovanov	feat(Data.Nat.Bits): add Nat.ofBits and prove bits_injective	This PR introduces `Nat.ofBitsList` for `List Bool` and provides the missing proofs that the standard binary representation `Nat.bits` is injective (`Nat.bits_injective`) and possesses a right inverse for normalized lists (`Nat.bits_ofBitsList`). `ofBitsList` is implemented as an `abbrev` using `foldr` (keeping it transparent to tactics like `simp`). It serves as the exact left inverse to `bits`. Furthermore, `bits_ofBitsList` establishes that `bits` and `ofBitsList` form a bijection between `ℕ` and the set of lists with no trailing `false` values. This avoids the name collision with `Nat.ofBits` from `Batteries` and aligns with previous Zulip discussions (see [here](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration)) regarding the utility of having a complete list-based API for `Nat.bits` in the library. CC: @linesthatinterlace - Adds `Nat.ofBitsList` (as an `abbrev`) - Adds `Nat.ofBitsList_bits` (left inverse property) - Adds `Nat.bits_injective` - Adds `Nat.ofBitsList_eq_zero_iff` (helper lemma for lists without trailing zeros) - Adds `Nat.bits_ofBitsList` (right inverse property) --- Zulip: [#PR reviews > PR #35857: Bijective Base-2 Numeration](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/PR.20.2335857.3A.20Bijective.20Base-2.20Numeration/with/576336540) Zulip: [#batteries > Upstreaming Nat.Bits](https://leanprover.zulipchat.com/#narrow/channel/348111-batteries/topic/Upstreaming.20Nat.2EBits/with/580736051)	t-data new-contributor awaiting-author blocked-by-batt-PR	68/1	Mathlib/Data/Nat/Bits.lean	1	5	['github-actions', 'joneugster', 'linesthatinterlace']	nobody	69-5346 2 months ago	59-43666 59 days ago	9-58085 9 days
35684	spitters author:spitters	feat(CategoryTheory/MarkovCategory): Kleisli PMF is a Markov category	Add `Mathlib/CategoryTheory/MarkovCategory/KleisliPMF.lean` showing that `KleisliCat PMF` is a `MarkovCategory`. Uses `Prod` as tensor and `PUnit` as unit; reuses Mathlib's existing `KleisliCat`, `LawfulMonad PMF`, and `MarkovCategory` infrastructure. Builds the full instance stack: MonoidalCategory → BraidedCategory → SymmetricCategory → CopyDiscardCategory → MarkovCategory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author merge-conflict	323/1	Mathlib.lean,Mathlib/CategoryTheory/MarkovCategory/KleisliPMF.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	6	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'spitters']	nobody	68-81626 2 months ago	81-27471 81 days ago	2-36419 2 days
35738	GrigorenkoPV author:GrigorenkoPV	perf: remove some `aesop`s and `grind`s	--- Needs benchmarking. After that I can split it into several smaller portions, if needed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author merge-conflict	236/92	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Rel.lean,Mathlib/Data/Set/Lattice/Image.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/SupIndep.lean	8	7	['github-actions', 'mathlib-merge-conflicts', 'themathqueen', 'vihdzp']	nobody	68-81625 2 months ago	82-63305 82 days ago	0-45583 12 hours
36089	pfaffelh author:pfaffelh	feat(Topology/Compactness/CompactSystem): set system of finite unions of sets in a compact system is again a compact system	A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the finite unions of sets in the copact system. Such sets again form a compact system (`IsCompactSystem.union.isCompactSystem`). This was previously #25900. --- - [ ] depends on: #36013 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-topology merge-conflict	527/0	Mathlib/Data/Set/Dissipate.lean,Mathlib/Topology/Compactness/CompactSystem.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-81621 2 months ago	26-50576 26 days ago	0-58592 16 hours
36160	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): closed and compact square cylinders form a compact system	feat (Topology/Compactness/CompactSystem): Closed and compact square cylinders form a compact system A square cylinder is a set of the form `s.pi t` in a product space. A closed compact square cylinder has `IsClosed (t i)` and `IsCompact (t i)` for all `i ∈ s`. This set system is a compact system (as introduced in PR #36013). Streamline the definition of square cylinders in MeasureTheory/Constructions/Cylinders on the way. Co-authors: Rémy Degenne remy.degenne@inria.fr --- - [ ] depends on: #36013 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian merge-conflict t-topology	388/1	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	7	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-81620 2 months ago	68-81620 68 days ago	0-64125 17 hours
36225	pfaffelh author:pfaffelh	feat(Topology/Compactness/CompactSystem): set system of countable intersections of sets in a compact system is again a compact system	A compact system is a set system with the following property: If all finite intersections of a sequence in the set system is non-empty, the countable intersection is not empty. Starting with a compact system, consider the countable intersections of sets in the copact system. Such sets again form a compact system. --- - [x] depends on: #36013 - [ ] depends on: #38245 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian WIP file-removed merge-conflict blocked-by-other-PR	313/0	Mathlib.lean,Mathlib/Algebra/Group/Irreducible/Indecomposable.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/AlgebraicTopology/DoldKan/Compatibility.lean,Mathlib/AlgebraicTopology/DoldKan/Equivalence.lean,Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean,Mathlib/Analysis/Normed/Group/Indicator.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Lemmas.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/Order/Interval/Set/LinearOrder.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Independence.lean,Mathlib/Probability/Independence/BoundedContinuousFunction.lean,Mathlib/Probability/Independence/Process/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/CompactSystem.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,docs/1000.yaml	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-81616 2 months ago	68-81616 68 days ago	1-16213 1 day
35588	eric-wieser author:eric-wieser	chore(Util/Qq): remove `meta`	These are wrappers of existing functions on `Expr`s which are also not marked `meta`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-CI delegated	7/7	Mathlib/Data/Multiset/Sort.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Order/ToInt.lean,Mathlib/Tactic/Simproc/Divisors.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Util/Qq.lean	7	3	['Vierkantor', 'github-actions', 'mathlib-bors']	nobody	68-77765 2 months ago	86-75701 86 days ago	0-35325 9 hours
36334	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve): add notation and pretty printer for points	Co-authored-by: Kenny Lau --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-meta WIP merge-conflict	41/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	3	13	['CBirkbeck', 'Multramate', 'adamtopaz', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'riccardobrasca']	adamtopaz assignee:adamtopaz	68-61298 2 months ago	26-30387 26 days ago	45-86235 45 days
32692	WilliamCoram author:WilliamCoram	feat: define multivariate restricted power series	We define multivariate restricted power series over a normed ring R, and show the properties that they form a ring when R has the ultrametric property. This work generalises my previous work in #26089 which will need to be refactored. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-number-theory new-contributor awaiting-author	178/0	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/RingTheory/MvPowerSeries/Restricted.lean	3	47	['WilliamCoram', 'erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	jcommelin assignee:jcommelin	68-53813 2 months ago	8-7342 8 days ago	42-61064 42 days
34728	j-loreaux author:j-loreaux	feat: continuous linear equivalence between continuous `ℝ`- and `𝕜`-linear functionals (in either the strong or weak-⋆ topologies)	This realizes the map `StrongDual.extendRCLikeₗ`, after pre- and post-composing so that it is an equivalence between the weak duals, as a continuous linear equivalence. In addition, when the space is a topological vector space, we realize `StrongDual.extendRCLikeₗ` as a continuous linear equivalence between the strong duals. --- - [x] depends on: #34543 The placement in `Analysis/Normed/Module/WeakDual` seems suboptimal because this has nothing to do with the norm. This is because `WeakDual.toStrongDual` is already in this file, which should probably be moved to `Topology/Algebra/Module/WeakDual`. However, even if that moves, the declarations added in this PR cannot easily go with it because they involve `RCLike`. Potentially, they could move to `Analysis/RCLike/Extend` if that file gained the `Topology/Algebra/Module/WeakDual` import. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	87/2	Mathlib/Analysis/Normed/Module/RCLike/Extend.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean	2	19	['ADedecker', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen']	urkud assignee:urkud	68-51476 2 months ago	25-5819 25 days ago	43-79923 43 days
30451	kckennylau author:kckennylau	feat(HomogeneousIdeal): generalize to homogeneous submodule	Continuation of #30437 with permission from @jjaassoonn, which is a continuation of #9820 . The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to homogeneous submodules. Let `R` be a graded ring and `M` be a graded `R`-module. Say an `R`-submodule `N` of `M` is homogeneous if for every `x` in `N`, each projection of `x` to `M_i` is in `N`. None of this file's results depends on the grading on `R`, but we include the grading on `R` for technical reasons. We define the "homogeneous core" of a not necessarily homogeneous submodule N to be the biggest homogeneous submodule contained within N, and the "homogeneous hull" to be the smallest homogeneous submodule that contains N. All definitions/constructions/theorems are then copied for ideals/homogeneous ideals. The motivation of this generalization is graded quotient module. (#18716) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author merge-conflict	581/185	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean	10	23	['github-actions', 'mariainesdff', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	68-50070 2 months ago	68-50070 68 days ago	22-61538 22 days
35042	JovanGerb author:JovanGerb	chore: remove `meta` form `import Mathlib.Tactic...`	This PR cleans up some imports of the form `import Mathlib.Tactic...`, by either removing them entirely, or removing the `meta` keyword. It should never be necessary to `meta import` a file from `Mathlib.Tactic`, because the relevant definitions should already have been marked as `meta`. The motivation is to reduce the amount of files that are `meta` imported when writing e.g. `import Mathlib`, hence reducing the amount of stuff that needs to be loaded. There are more other `meta import`s that need to be removed, but this PR is a good start. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	61/142	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/Data/List/ChainOfFn.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/ApplyFun.lean,Mathlib/Tactic/ArithMult.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CategoryTheory/Coherence/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Elementwise.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,Mathlib/Tactic/Choose.lean,Mathlib/Tactic/DeclarationNames.lean,Mathlib/Tactic/DefEqTransformations.lean,Mathlib/Tactic/DeriveCountable.lean,Mathlib/Tactic/DeriveFintype.lean,Mathlib/Tactic/DeriveTraversable.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Tactic/Explode.lean,Mathlib/Tactic/Explode/Pretty.lean,Mathlib/Tactic/FinCases.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRewrite/Elab.lean,Mathlib/Tactic/Group.lean,Mathlib/Tactic/IrreducibleDef.lean,Mathlib/Tactic/Lift.lean,Mathlib/Tactic/Linarith.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/Gauss.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/SimplexAlgorithm.lean,Mathlib/Tactic/Linarith/Preprocessing.lean,Mathlib/Tactic/Linarith/Verification.lean,Mathlib/Tactic/LinearCombination/Lemmas.lean,Mathlib/Tactic/Linter/DeprecatedSyntaxLinter.lean,Mathlib/Tactic/Linter/DocPrime.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/Linter/EmptyLine.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Linter/GlobalAttributeIn.lean,Mathlib/Tactic/Linter/HashCommandLinter.lean,Mathlib/Tactic/Linter/Multigoal.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/TextBased/UnicodeLinter.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Tactic/Linter/UnusedTacticExtension.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Nontriviality/Core.lean,Mathlib/Tactic/NormNum/DivMod.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Tarjan.lean,Mathlib/Tactic/PNatToNat.lean,Mathlib/Tactic/Peel.lean,Mathlib/Tactic/ProdAssoc.lean,Mathlib/Tactic/ProxyType.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Qify.lean,Mathlib/Tactic/RSuffices.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Common.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/PNat.lean,Mathlib/Tactic/Simproc/Divisors.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Subsingleton.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TautoSet.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Translate/TagUnfoldBoundary.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CommDiag.lean,Mathlib/Tactic/Widget/CongrM.lean	107	9	['JovanGerb', 'dupuisf', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	robin-carlier assignee:robin-carlier	68-49347 2 months ago	63-72640 63 days ago	26-69911 26 days
36486	eric-wieser author:eric-wieser	refactor: change Encodable to uniquely specify `decode`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-logic	73/47	Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Function/Basic.lean	2	0	[]	nobody	68-48875 2 months ago	unknown	0-0 0 seconds
36487	samueloettl author:samueloettl	feat(Dynamics): Ergodicity characterization	--- - [ ] depends on: #35402 - [x] depends on: #35451 This is a work in progress for a characterization of ergodicity via a Birkhoff Average. Coarse Feedback is very encouraged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor large-import blocked-by-other-PR	421/1	Mathlib/Dynamics/Ergodic/Function.lean,Mathlib/Dynamics/Ergodic/OnAverageIndependent.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean	3	3	['github-actions', 'mathlib-dependent-issues']	nobody	68-46463 2 months ago	68-46482 68 days ago	0-163 2 minutes
35881	astrainfinita author:astrainfinita	chore: do not use `inf` `sup` in `LinearOrder` lemmas	`max` and `sup` have been unified into the same function. It is no longer necessary to create lemmas about `sup` for `LinearOrder`. This PR moves `max` lemmas to an earlier file to ensure that files importing deprecated `sup` lemmas can use them. --- - [ ] depends on: #35841 - [ ] depends on: #35880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict blocked-by-other-PR	136/126	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/List/Infix.lean,Mathlib/Data/Nat/Factorization/LCM.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Set/LinearOrder.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/MinMax.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,Mathlib/RingTheory/Polynomial/HilbertPoly.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean,Mathlib/RingTheory/PowerSeries/WeierstrassPreparation.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Tactic/Order/ToInt.lean,Mathlib/Topology/MetricSpace/Algebra.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/MetricSpace/Infsep.lean,Mathlib/Topology/Semicontinuity/Basic.lean	44	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-45937 2 months ago	79-79411 79 days ago	0-532 8 minutes
35802	xroblot author:xroblot	feat(RamificationInertia): splitting in the decomposition field	--- - [x] depends on: #35798 - [ ] depends on: #35405 - [x] depends on: #35371 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory large-import merge-conflict blocked-by-other-PR	279/4	Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness/Basic.lean	4	5	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-45450 2 months ago	81-69375 81 days ago	0-537 8 minutes
35522	grunweg author:grunweg	feat: lint for unused `backward` options	--- Based on the `unnecessarySetOptionIn` linter (#35521 and #13653). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter tech debt large-import	211/4	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/UnnecessarySetOptionIn.lean,MathlibTest/UnnecessarySetOptionIn.lean,lakefile.lean	7	3	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	68-34371 2 months ago	88-73298 88 days ago	0-19 19 seconds
36412	Timeroot author:Timeroot	refactor(Topology/Perfect): Change PerfectSpace to be a synonym for NeBot	Refactor PerfectSpace to be, equivalently, just `forall (x : α) : Filter.NeBot (𝓝[≠] x)`. See [#mathlib4 > Changing PerfectSpace](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Changing.20PerfectSpace/with/575568102) for discussion This is unmodified output from @Aristotle-Harmonic ! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Co-authored-by: Aristotle (Harmonic)		54/50	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Module/RCLike/Real.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/PerfectSpace.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Perfect.lean,Mathlib/Topology/Separation/Connected.lean	7	2	['github-actions']	nobody	68-33171 2 months ago	68-33421 68 days ago	2-2775 2 days
36495	AlexKontorovich author:AlexKontorovich	chore(Finset/NatDivisors): refactor `card_divisors_mul` and `sum_divisors_mul` to not rely on `ArithmeticFunction`	`Nat.Coprime.card_divisors_mul` and `Nat.Coprime.sum_divisors_mul` are moved to not rely on `ArithmeticFunction`. See zulip discussion here: [#mathlib4 > Library design question, e.g.`Nat.Coprime.card_divisors_mul` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Library.20design.20question.2C.20e.2Eg.2E.60Nat.2ECoprime.2Ecard_divisors_mul.60/near/577769899) Co-authored-by: Ziyan Wei and Aayush Rajasekaran --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory t-algebra merge-conflict label:t-algebra$	45/14	Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Data/Finset/NatDivisors.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean	3	6	['AlexKontorovich', 'arajasek', 'github-actions', 'mathlib-merge-conflicts']	riccardobrasca assignee:riccardobrasca	68-32864 2 months ago	10-29228 10 days ago	53-21240 53 days
36079	DavidLedvinka author:DavidLedvinka	refactor(Probability): Refactors Conditional Independence to allow spaces that are not Standard Borel		merge-conflict	1827/1120	Mathlib.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalLExpectation.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,Mathlib/Order/Filter/CountableInter.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/CondIndep.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Independence/Conditional/CondIndep.lean,Mathlib/Probability/Independence/Conditional/CondIndepFun.lean,Mathlib/Probability/Independence/ZeroOne.lean,Mathlib/Probability/Kernel/Condexp.lean	12	2	['github-actions', 'mathlib-merge-conflicts']	nobody	68-24403 2 months ago	unknown	0-0 0 seconds
35991	xroblot author:xroblot	feat(RamificationInertia): decomposition field and inertia field of compositum	--- - [ ] depends on: #35808 - [x] depends on: #35493 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict large-import	645/36	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean	9	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-23800 2 months ago	77-43201 77 days ago	0-316 5 minutes
36236	kim-em author:kim-em	chore: add module keyword to Archive and Counterexamples files	This PR converts 105 Archive and Counterexamples files to module format, adding `module`, `public import`, and `@[expose] public section`. Eight files are left unconverted for now: - Seven files containing `private` declarations that need further work (`Imo1962Q1`, `MiuLanguage/Basic`, `MiuLanguage/DecisionSuf`, `AscendingDescendingSequences`, `BallotProblem`, `AharoniKorman`, `TopologistsSineCurve`) - `Counterexamples/InvertibleModuleNotIdeal` which needs an import path update For `Archive/Examples/PropEncodable`, the `private` declarations were removed as part of this conversion. 🤖 Prepared with Claude Code	IMO LLM-generated merge-conflict awaiting-author	693/308	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/Kuratowski.lean,Archive/Examples/PropEncodable.lean,Archive/Hairer.lean,Archive/Imo/Imo1959Q1.lean,Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo1961Q3.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1963Q5.lean,Archive/Imo/Imo1964Q1.lean,Archive/Imo/Imo1969Q1.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1975Q1.lean,Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1982Q1.lean,Archive/Imo/Imo1985Q2.lean,Archive/Imo/Imo1986Q5.lean,Archive/Imo/Imo1987Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2001Q3.lean,Archive/Imo/Imo2001Q4.lean,Archive/Imo/Imo2001Q5.lean,Archive/Imo/Imo2001Q6.lean,Archive/Imo/Imo2002Q3.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2005Q4.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2010Q5.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2015Q6.lean,Archive/Imo/Imo2019Q1.lean,Archive/Imo/Imo2019Q2.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2020Q2.lean,Archive/Imo/Imo2021Q1.lean,Archive/Imo/Imo2024Q2.lean,Archive/Imo/Imo2024Q3.lean,Archive/Imo/Imo2024Q6.lean,Archive/Imo/Imo2025Q3.lean,Archive/Kuratowski.lean,Archive/MinimalSheffer.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/HeronsFormula.lean,Archive/Wiedijk100Theorems/InverseTriangleSum.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Archive/Wiedijk100Theorems/SolutionOfCubicQuartic.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Archive/ZagierTwoSquares.lean,Counterexamples/CanonicallyOrderedCommSemiringTwoMul.lean,Counterexamples/CharPZeroNeCharZero.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/Cyclotomic105.lean,Counterexamples/DimensionPolynomial.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/EulerSumOfPowers.lean,Counterexamples/Girard.lean,Counterexamples/HeawoodUnitDistance.lean,Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/IrrationalPowerOfIrrational.lean,Counterexamples/MapFloor.lean,Counterexamples/MonicNonRegular.lean,Counterexamples/Motzkin.lean,Counterexamples/NowhereDifferentiable.lean,Counterexamples/OrderedCancelAddCommMonoidWithBounds.lean,Counterexamples/PeanoCurve.lean,Counterexamples/Phillips.lean,Counterexamples/PolynomialIsDomain.lean,Counterexamples/Pseudoelement.lean,Counterexamples/QuadraticForm.lean,Counterexamples/SeminormLatticeNotDistrib.lean,Counterexamples/SeparableNotSecondCountable.lean,Counterexamples/SorgenfreyLine.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean	97	9	['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	68-22177 2 months ago	25-22345 25 days ago	11-44755 11 days
36503	Mrigna01 author:Mrigna01	Add false theorem test file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	135/0	Mathlib/FalseBench/FalseTheorems.lean	1	3	['github-actions']	nobody	68-18508 2 months ago	68-18598 68 days ago	68-18591 68 days
36018	wwylele author:wwylele	feat(LinearAlgebra/AffineSpace): shifting a subspace towards a point (part 2)	This is preparing to calculate the volume of a simplex by integrating the cross-section created by shifting the base plane. Part of #34826. --- - [ ] depends on: #38220 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	254/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	3	8	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	68-17529 2 months ago	30-27959 30 days ago	37-76325 37 days
30352	kckennylau author:kckennylau	feat(RingTheory): Homogeneous localization of tensor product	Let `𝒜` be a graded `R`-algebra, and `S` be an `R`-algebra. Then `S ⊗[R] 𝒜` is a graded `S`-algebra with the same grading. Let `W` be a homogeneous submonoid of `𝒜`. Then `(S⊗[R]𝒜)[(1⊗W)⁻¹]₀ ≅ S ⊗[R] (𝒜[W⁻¹]₀)`. --- Split from #26061. - [x] depends on: #30173 - [x] depends on: #30322 - [x] depends on: #30365 - [x] depends on: #36252 Optionally depends on #30379 (graded ring equiv) and #36346 (simp Algebra.algHom), which will save a few lines here, so they are not high priority for this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	471/22	Mathlib.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/GradedAlgebra/TensorLocalization.lean,Mathlib/RingTheory/Localization/TensorProduct.lean	5	5	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	68-13683 2 months ago	60-35830 60 days ago	11-55488 11 days
36346	kckennylau author:kckennylau	chore: add simp lemma to unfold Algebra.algHom	```lean @[simp] lemma Algebra.coe_algHom : ⇑(Algebra.algHom R A B) = algebraMap A B := rfl ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/2	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/RingTheory/Etale/StandardEtale.lean	2	5	['acmepjz', 'artie2000', 'github-actions', 'ocfnash']	ocfnash assignee:ocfnash	68-13675 2 months ago	45-68547 45 days ago	26-21993 26 days
26803	bjoernkjoshanssen author:bjoernkjoshanssen	feat: second partial derivatives test	We prove that if `f` is a real-valued function on `n`-dimensional Euclidean space with vanishing gradient at `x₀`, having a power series on a ball of positive radius around `x₀`, whose second Frechét derivative is positive definite at `x₀`, then `f` has local minimum at `x₀`. This project was started at the Lean for Mathematicians workshop hosted by the Simons Foundation in June 2025 in a group consisting of Bjørn Kjos-Hanssen, Erin Griffin, Asaf Kapota, and Janani Lakshmanan, see repo at https://github.com/bjoernkjoshanssen/secondpartial --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	572/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivativeTest.lean,Mathlib/Analysis/Normed/Operator/NormedSpace.lean,Mathlib/Topology/Constructions.lean	4	32	['bjoernkjoshanssen', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'themathqueen']	j-loreaux assignee:j-loreaux	68-5784 2 months ago	90-28849 90 days ago	9-48004 9 days
14603	awueth author:awueth	feat: degree is invariant under graph isomorphism	--- Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-combinatorics new-contributor	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	12	['SnirBroshi', 'awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	67-86306 2 months ago	644-46745 644 days ago	31-44440 31 days
35956	Scarlett-le author:Scarlett-le	feat: add orthogonality lemmas for inner product spacesonal	## Summary Adds two lemmas about orthogonality in inner product spaces. ## New declarations - `real_inner_sub_smul_div_inner_self_eq_zero` (`Mathlib.Analysis.InnerProductSpace.Basic`): the inner product of `u - (⟪u, d⟫_ℝ / ⟪d, d⟫_ℝ) • d` with `d` is zero; subtracting the orthogonal projection of `u` onto `d` yields a vector orthogonal to `d`. Holds unconditionally including when `d = 0`. - `mem_span_singleton_of_inner_eq_zero_of_inner_eq_zero` (`Mathlib.Analysis.InnerProductSpace.Projection.FiniteDimensional`): in a two-dimensional inner product space, if nonzero vectors `w` and `u` are both orthogonal to the same nonzero vector `v`, then `u` lies in the span of `w`.	t-analysis awaiting-author	26/0	Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean	1	9	['Scarlett-le', 'github-actions', 'j-loreaux']	sgouezel assignee:sgouezel	67-76236 2 months ago	61-40568 61 days ago	10-34309 10 days
33599	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): closure under union	--- This PR picks up https://github.com/leanprover-community/mathlib4/pull/13514 and resolves the outstanding errors. - [ ] depends on: #33592 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-computability new-contributor	498/0	Mathlib/Computability/ContextFreeGrammar.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	67-69743 2 months ago	122-78602 122 days ago	10-65787 10 days
33355	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph/Connectivity): define vertex connectivity	This PR introduces the foundations of vertex connectivity for simple graphs, providing a counterpart to the edge connectivity theory in #32870. ### Main definitions - `SimpleGraph.IsVertexReachable`: vertices remain reachable after removing strictly fewer than `k` other vertices. - `SimpleGraph.IsVertexConnected`: a graph is `k`-vertex-connected if its order is strictly greater than `k` and any two distinct vertices are `k`-vertex-reachable. Includes basic characterizations for $k=0$ and $k=1$, along with monotonicity lemmas (`anti` and `mono`).	new-contributor t-combinatorics awaiting-author	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	147	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	67-69337 2 months ago	15-61698 15 days ago	51-31094 51 days
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	please-adopt t-data new-contributor merge-conflict awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'urkud', 'vihdzp']	nobody	67-69199 2 months ago	847-40687 847 days ago	12-48883 12 days
10332	adri326 author:adri326	feat(Topology/Sets): define regular open sets and their boolean algebra	Introduces a new module, `Mathlib.Topology.Sets.RegularOpens`, which defines the `IsRegularOpen s` predicate (`interior (closure s) = s`) and `TopologicalSpace.RegularOpens`, the type of bundled regular open sets (defined as `Heyting.Regular (Opens X)`). A few properties of regular open sets (bundled and unbundled) and `interior (closure s)` are proven, and a pointwise instance of `MulAction` is provided for regular open sets. --- This PR belongs to my series of PRs around my formalization of Rubin's theorem. There are two possible ways to implement `RegularOpens`: - either construct them by hand and show that they form a boolean algebra (better def-eq but more boilerplate code required) - or use `Heyting.Regular` on the heyting algebra of `Opens` inherited from the `Frame` instance on them I first chose to use the former approach, but using the latter cuts the length of the construction of the boolean algebra of regular open sets by 100 lines of code, and allows us to inherit all of the helper lemmas defined for `Heyting.Regular`. The big downside, though, is that an element of `RegularOpens` isn't defined as a bundled regular open set anymore, but rather as an `Opens` set `s` for which `Opens.interior ↑(Opens.interior ↑sᶜ)ᶜ = s`, so I added an alternative constructor `RegularOpens.of` that instead accepts any set `s` for which `IsRegularOpen s` holds. Another minor downside is that coercion to a set takes two coercions instead of one. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology	434/0	Mathlib.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sets/RegularOpens.lean,docs/references.bib	5	1	['adri326']	nobody	67-69166 2 months ago	831-52607 831 days ago	0-1135 18 minutes
36428	linesthatinterlace author:linesthatinterlace	feat(Logic/Equiv/Fin): Streamline equiv definitions using mkDivMod	This PR uses Fin.mkDivMod to streamline the related equivalence and introduces Nat.mkDivMod to a similar end. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic WIP	24/29	Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/Order/Partition/Equipartition.lean	2	4	['JovanGerb', 'github-actions', 'linesthatinterlace']	nobody	67-68493 2 months ago	60-47863 60 days ago	0-6487 1 hour
36496	erdOne author:erdOne	feat(Tactic/Linter): lint against `simpa ... using by tactic`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import awaiting-author merge-conflict	134/12	Mathlib.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Condensed/Light/Epi.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Probability/Distributions/Poisson/Basic.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/ParallelComp.lean,Mathlib/Probability/Kernel/Condexp.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/SimpaUsingBy.lean,MathlibTest/simpaUsingBy.lean	15	24	['erdOne', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	67-68476 2 months ago	68-22469 68 days ago	0-2953 49 minutes
36533	Bergschaf author:Bergschaf	feat(Order/Sublocales): Closed sublocales	This PR introduces closed sublocales and their property being the complement of Open sublocales in the Coframe of sublocales. The embedding from closed sublocales into sublocales is a coframeHom, which is also added in this PR. If this PR is to large, I can also factor this part out (although it should be quite uncontroversial since i basically copied everything from frameHom). - [ ] depends on: #25978 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	439/37	Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	67-53782 2 months ago	67-54947 67 days ago	0-248 4 minutes
35652	dennj author:dennj	feat(LinearAlgebra/Matrix): add `Matrix.mul_eq_smul_one_symm`	Adds three lemmas: - IsLeftRegular.mul_eq_of_comm (Algebra/Group/Defs.lean): if a is left-regular, a * b = c, and c commutes with a, then b * a = c. Generalises IsLeftRegular.mul_eq_one_symm from the c = 1 case. - IsRightRegular.mul_eq_of_comm: symmetric version. - mul_eq_smul_one_symm (Algebra/Group/Action/Defs.lean): scalar variant of mul_eq_one_symm. For a monoid β with a compatible scalar action by α, if a * b = c • 1 and a is left-regular, then b * a = c • 1. Proven in one line via IsLeftRegular.mul_eq_of_comm, since c • 1 is central thanks to IsScalarTower α β β and SMulCommClass α β β. The additive analogues are produced by to_additive. The general mul_eq_of_comm helpers capture the underlying pattern: "a left/right-regular element can be cancelled when the conclusion commutes with it" and are reusable beyond this PR's specialisation. Human made PR	t-algebra new-contributor LLM-generated awaiting-author label:t-algebra$	28/0	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Defs.lean	1	7	['dagurtomas', 'dennj', 'eric-wieser', 'github-actions', 'grunweg']	ocfnash assignee:ocfnash	67-49442 2 months ago	15-18845 15 days ago	24-65258 24 days
36540	faenuccio author:faenuccio	perf: personal grind test	Private test	WIP t-algebra label:t-algebra$	5/0	Mathlib/Algebra/Ring/Nat.lean	1	4	['faenuccio', 'github-actions', 'leanprover-radar']	faenuccio assignee:faenuccio	67-44931 2 months ago	67-47960 67 days ago	0-16 16 seconds
35263	astrainfinita author:astrainfinita	refactor: use `OrderSupInfSet`	--- - [ ] depends on: #35297 - [ ] depends on: #35328 - [ ] depends on: #35774 - [ ] depends on: #35674 [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F/with/573799342) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order large-import blocked-by-other-PR merge-conflict	952/701	Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Category/Pairwise.lean,Mathlib/CategoryTheory/Limits/Lattice.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subfunctor/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Int/ConditionallyCompleteOrder.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/BooleanAlgebra.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/Bounds/Image.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Order/CompleteLattice/PiLex.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/Concept.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/ScottContinuity/Prod.lean,Mathlib/Order/SupClosed.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Algebra/Ring/Basic.lean,Mathlib/Topology/Order/HullKernel.lean,Mathlib/Topology/UniformSpace/Basic.lean	58	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	67-43117 2 months ago	unknown	0-0 0 seconds
36544	xroblot author:xroblot	feat(RingTheory/Ideal): restriction maps on decomposition and inertia groups in a Galois tower	Adds a new file `Mathlib/RingTheory/Ideal/Galois.lean` with results on the action of `Gal(L/K)` on ideals of a ring `B ⊆ L` for a Galois subextension `F/K` of `L/K`. The main results are the surjectivity and kernel descriptions of the natural maps from the decomposition (resp. inertia) group of `P` in `Gal(L/K)` to the decomposition (resp. inertia) group of `p` in `Gal(F/K)`, induced by restriction. --- - [ ] depends on: #38153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author WIP blocked-by-other-PR	223/0	Mathlib.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/RingTheory/Ideal/Galois.lean	4	18	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-dependent-issues', 'riccardobrasca', 'tb65536', 'xroblot']	riccardobrasca assignee:riccardobrasca	67-39209 2 months ago	32-69374 32 days ago	34-56618 34 days
32410	callesonne author:callesonne	feat(Bicategory/FunctorCategory/Pseudo): Add evaluation pseudofunctor	Adding pseudofunctors `eval` and `evaluation`. WIP PR to access CI. --- - [x] depends on: #30926 - [x] depends on: #32468 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	49/10	Mathlib/CategoryTheory/Bicategory/Functor/StrictlyUnitary.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Products/Basic.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	67-24971 2 months ago	166-19102 166 days ago	0-9 9 seconds
31901	callesonne author:callesonne	feat(Bicategory/Subbicategory): add full subbicategories using `ObjectProperty`	Analogously to the 1-categorical setting we construct a full subbicategory from an object property. One could also construct locally full subbicategories using a pair of an object property and a morphism property. However then there is no way to obtain the bicategory structure by specializing from the `InducedBicategory` case. It is not clear to me if we want a full subbicategory to be specialized from this other construction, or from `InducedBicategory`. --- - [x] depends on: #30925 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author merge-conflict	135/2	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean,Mathlib/CategoryTheory/Bicategory/Subbicategory.lean	4	8	['callesonne', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	67-24900 2 months ago	164-47471 164 days ago	2-61446 2 days
34078	joneugster author:joneugster	feat(scripts/autolabel): add label dependencies for better automatic label assignment	--- This is a tracking-PR containing the complete list of proposed labels. As there might be room for discussion about these settings, there will be smaller PRs adding these dependencies in smaller batches. - [x] depends on: #34948 - [x] depends on: #34949 - [x] depends on: #34066 - [x] depends on: #34079 - [x] depends on: #34677 - [x] depends on: #34678 - [ ] depends on: #34952 - [x] depends on: #36242 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR CI merge-conflict	88/34	scripts/autolabel.lean	1	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	67-22459 2 months ago	unknown	0-0 0 seconds
36572	JovanGerb author:JovanGerb	feat(CategoryTheory/Limits/IsLimit): use `to_dual` on `IsLimit`	This PR makes a start at translating `IsLimit` using `to_dual`. --- - [ ] depends on: #35031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	290/637	Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Basic.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Constructions/Filtered.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Shapes/NormalMono/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Reflexive.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/NatTrans.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Whiskering.lean,Mathlib/Combinatorics/Quiver/Basic.lean,Mathlib/Tactic/Translate/Core.lean	17	2	['github-actions', 'mathlib-dependent-issues']	nobody	67-17620 2 months ago	67-14108 67 days ago	0-3586 59 minutes
34952	joneugster author:joneugster	feat(scripts/autolabel): use `Cli` and integrate `curl` call into `autolabel`	- use `Cli` for `lake exe autolabel` - add arguments `--pr xxx --gh` and `--pr xxx --curl ` to chose between different interaction methods with github - add `--force` to skip the check whether labels are already present. (note: the current `curl` setup doesn't perform this step and neither does the refactor, so I added a `Todo` to remember this. ) - make CI-workflow simpler and more robust by removing current stdout-parsing of the debug-messages which `autolabel` emits. ### Testing Make some local changes and commit them. Ensure your local `origin/master` is in sync with `upstream/master` if you are on a fork. - `lake exe autolabel`: prints the labels which would be applicable - `lake exe autolabel --pr 34952 --gh --force` adds these labels to this PR using `gh`. - `lake exe autolabel --pr 34952 --gh` adds these labels to this PR using `gh` if no topic labels are present. - `lake exe autolabel --pr 34952 --curl ` adds these labels to this PR using `curl`. This requires a github access token for authentication --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	85/72	.github/workflows/add_label_from_diff.yaml,scripts/autolabel.lean	2	4	['github-actions', 'mathlib-merge-conflicts']	nobody	67-13662 2 months ago	50-60671 50 days ago	83-15102 83 days
36086	Multramate author:Multramate	feat(Algebra): add liftEquiv for groups, rings, algebras, and adjoin roots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	105/22	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/RatFunc/Luroth.lean,Mathlib/GroupTheory/GroupExtension/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	12	7	['CBirkbeck', 'Multramate', 'dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	dagurtomas assignee:dagurtomas	67-13657 2 months ago	60-44206 60 days ago	15-18023 15 days
36146	Multramate author:Multramate	feat(AlgebraicGeometry/GammaSpecAdjunction): add equivalences for Spec morphisms that commute with algebra maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-algebra awaiting-author label:t-algebra$	46/2	Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Scheme.lean	3	18	['CBirkbeck', 'Multramate', 'chrisflav', 'erdOne', 'github-actions']	dagurtomas assignee:dagurtomas	67-13656 2 months ago	62-46286 62 days ago	12-46044 12 days
35822	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice): `sSup (f '' s) ≤ f (sSup s)`	--- #35260 will add `iSup` versions. (edit: it was merged, and it's only for `[Finite ι]`) Future work (though I'm not sure if it's possible): `Antitone`, `MonotoneOn`, `AntitoneOn` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	38/1	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean	2	8	['Komyyy', 'SnirBroshi', 'github-actions', 'vihdzp']	Komyyy assignee:Komyyy	67-10177 2 months ago	65-59933 65 days ago	15-68575 15 days
29856	mans0954 author:mans0954	feat(Analysis/Normed/Ring/Basic): Add NonUnitalNonAssocSeminormedRing and NonUnitalNonAssocNormedRing	Adds the classes `NonUnitalNonAssocSeminormedRing` and `NonUnitalNonAssocNormedRing` and relaxes the `NonUnitalSeminormedRing` section to `NonUnitalNonAssocSeminormedRing`. Examples of non-unital non-associative normed rings include non-untial JB-algebras and non-unital JB*-algebras. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis please-adopt	110/11	Mathlib/Analysis/Normed/Ring/Basic.lean,MathlibTest/TCSynth.lean	2	15	['github-actions', 'j-loreaux', 'leanprover-bot']	ADedecker and j-loreaux assignee:j-loreaux assignee:ADedecker	67-5084 2 months ago	181-24271 181 days ago	57-16399 57 days
34846	fpvandoorn author:fpvandoorn	fix: module system and translate interaction	* Fix some issues when the value of an imported declaration is not available. This could cause `to_additive` to panic or turn the declaration into an axiom. * Don't print private names in messages * Don't panic when the declaration already exists modulo privateness. * Add some helper functions to `Lean.Environment` and `Lean.Meta`. --- Please double check the `PublicOrPrivate` declarations: - Do they already exist in core? - Does `addDeclSafe` catch all cases where `addDecl` would panic? I think these are useful (maybe after renaming) since some of the Core versions are a huge footgun, which can lead to panics in multiple ways. - [ ] depends on: #35134 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author blocked-by-other-PR merge-conflict	233/50	Mathlib/Lean/Environment.lean,Mathlib/Lean/Meta.lean,Mathlib/Tactic/Translate/Core.lean,MathlibTest/ToAdditiveModule.lean,MathlibTest/ToDual.lean,MathlibTest/toAdditive.lean	6	37	['JovanGerb', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	67-3513 2 months ago	101-33955 101 days ago	0-11069 3 hours
33466	Shreyas4991 author:Shreyas4991	refactor(Combinatorics/Digraph): add vertex sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict please-adopt	382/55	Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Digraph/Orientation.lean	2	83	['IvanRenison', 'Shreyas4991', 'SnirBroshi', 'YaelDillies', 'copilot-pull-request-reviewer', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp', 'vlad902']	awainverse assignee:awainverse	66-81779 2 months ago	66-81779 66 days ago	27-54087 27 days
36587	yhx-12243 author:yhx-12243	feat(Algebra/GCDMonoid): Distributive lattice structure for Associates in GCDMonoid	Add a distributive lattice structure for `Associates α` in `GCDMonoid`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	60/3	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/DistribLattice.lean	2	2	['github-actions']	nobody	66-78020 2 months ago	63-48595 63 days ago	3-29502 3 days
35662	FrankieeW author:FrankieeW	feat(NumberTheory/Zsqrtd): add Archimedean instance via le_arch	This PR follows a suggestion made in #35606 , #35481 - add `Zsqrtd.le_arch_smul` in `Mathlib/NumberTheory/Zsqrtd/Basic.lean` - use it to provide `instance : Archimedean (ℤ√d)` in the `Nonsquare` section - refactor the proof using symmetry to reduce duplication while keeping checks clean --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor awaiting-author merge-conflict LLM-generated	46/4	Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean	2	13	['FrankieeW', 'MichaelStollBayreuth', 'euprunin', 'github-actions', 'mathlib-merge-conflicts', 'tb65536']	MichaelStollBayreuth assignee:MichaelStollBayreuth	66-77756 2 months ago	69-55872 69 days ago	15-50475 15 days
36418	j-loreaux author:j-loreaux	feat: add `IsMulCommutative` instances for topological closures of subobjects	--- - [ ] depends on: #36549 - [ ] depends on: #36552 - [ ] depends on: #36553 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	1047/162	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Membership.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/CategoryTheory/Center/Linear.lean,Mathlib/CategoryTheory/Center/NegOnePow.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/Data/ZMod/QuotientGroup.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/GroupTheory/Focal.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean,Mathlib/GroupTheory/Submonoid/Centralizer.lean,Mathlib/GroupTheory/Subsemigroup/Centralizer.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/RepresentationTheory/AlgebraRepresentation/Basic.lean,Mathlib/RepresentationTheory/Irreducible.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubring/Defs.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Defs.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Algebra/NonUnitalAlgebra.lean,Mathlib/Topology/Algebra/NonUnitalStarAlgebra.lean,Mathlib/Topology/Algebra/Ring/Basic.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean	50	8	['github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	66-77744 2 months ago	67-33544 67 days ago	0-85 1 minute
36563	EtienneC30 author:EtienneC30	feat: brownian processes	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability merge-conflict	1517/1	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/BrownianMotion/IsBrownian.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Multivariate.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/Covariance.lean,Mathlib/Probability/Process/Filtration.lean	12	2	['github-actions', 'mathlib-merge-conflicts']	nobody	66-74393 2 months ago	unknown	0-0 0 seconds
34045	smmercuri author:smmercuri	feat: `algebraMap K L` is uniform continuous with respect to adic topologies, when the ideal `w` of `L` lies above `v`	- `A` is a Dedekind domain with field of fractions `K`. - `B` is a Dedekind domain with field of fractions `L`. - `L` is a field extension of `K`. - `v` is a height one prime ideal of `A`. - `w` is a height one prime ideal of `B` lying over `v`. Then respective valuations are related via the ramification index, and `algebraMap (WithVal (v.valuation K)) (WithVal (w.valuation L))` is uniform continuous. --- - [x] depends on: #34049 - [x] depends on: #35972 - [x] depends on: #36144 - [x] depends on: #36310 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-algebra t-number-theory label:t-algebra$	164/4	Mathlib.lean,Mathlib/Algebra/Order/Hom/Units.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	10	['dagurtomas', 'github-actions', 'jjdishere', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	alreadydone assignee:alreadydone	66-71436 2 months ago	21-53618 21 days ago	39-48151 39 days
36282	smmercuri author:smmercuri	chore(Topology/Algebra/Valued/WithVal): remove `@` lemma	Prove `Valuation.IsEquiv.uniformContinuous_congr` directly and remove `Valuation.IsEquiv.uniformContinuous` which is not needed. --- - [x] depends on: #36310 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	18/32	Mathlib/Topology/Algebra/Valued/WithVal.lean	1	5	['faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	faenuccio assignee:faenuccio	66-71283 2 months ago	49-50501 49 days ago	18-25760 18 days
36103	SnkXyx author:SnkXyx	feat(Algebra/MvPolynomial/CharacteristicSet): add Characteristic Set	This PR adds some definitions and theorems of Characteristic Set Method (also known as Wu's Method). Definitions: * `MvPolynomial.mainDegree` * `MvPolynomial.initialOf` * `MvPolynomial.reducedTo` * `TriangulatedSet` * `MvPolynomial.pseudo` * `MvPolynomial.setPseudo` * `MvPolynomial.isRemainder` * `MvPolynomial.isSetRemainder` * `AscendingSetTheory` * `TriangulatedSet.isAscendingSet` * `HasBasicSet` * `TriangulatedSet.isCharacteristicSet` * `MvPolynomial.List.characteristicSet` * `MvPolynomial.List.zeroDecomposition` Main Theorems: * `MvPolynomial.initialOf_mul_eq`: $init_i(p \cdot q) = init_i(p) \cdot init_i(q)$ if there is no zero divisors in the coefficient ring. * `TriangulatedSet.instWellFoundedLT`: The set of Triangulated Sets is well-founded under the lexicographic ordering. * `MvPolynomial.pseudo_remainder_isRemainder`: The remainder $r$ of $g$ by $f$ is reduced with respect to $f$ and satisfies $init(f)^s \cdot g = q \cdot f + r$ for some $s \in \mathbb{N}$ and $q \in R[X_{\sigma}]$. * `MvPolynomial.setPseudo_remainder_isSetRemainder`: The remainder $r$ of $g$ by a set $S$ is reduced with respect to $S$ and satisfies $(\prod S_i^{e_i}) \cdot g = \sum q_i \cdot S_i + r$ for some sequences $\{e_i\}$ and $\{q_i\}$. * `MvPolynomial.setPseudo_remainder_eq_zero_of_mem`: The remainder of $p$ by a set $S$ is $0$ if $p \in S$. * `MvPolynomial.List.basicSet_append_lt_of_exists_reducedToSet`: Appending an element which is reduced w.r.t. the basic set of list strictly decreases the order. * `MvPolynomial.List.characteristicSet_isCharacteristicSet`: The computed Characteristic Set $CS$ satisfies the key algebraic property (pseudo-remainder of input polynomials is 0) and the geometric property ( $Zero(PS) \subseteq Zero(CS)$ ). * `MvPolynomial.List.vanishingSet_eq_zeroDecomposition_union`: The zero set of a polynomial system $PS$ can be decomposed into a finite union of "quasi-varieties" defined by triangular sets: $Zero(PS) = \bigcup_{CS \in \mathcal{ZD}} Zero(CS / \text{InitialProd}(CS))$ The PR is upstreamized from [github.com/WuProver/lean_characteristic_set](https://github.com/WuProver/lean_characteristic_set) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #36386 - [x] depends on: #37791	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	4085/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/AscendingSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/CharacteristicSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Initial.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/MainDegree.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Order.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/PseudoDivision.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/Reduce.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/StandardAscendingSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/TriangularSet.lean,Mathlib/Algebra/MvPolynomial/CharacteristicSet/WeakAscendingSet.lean,docs/references.bib	14	20	['Hagb', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	66-69675 2 months ago	10-69906 10 days ago	15-60289 15 days
35291	mcdoll author:mcdoll	feat(Fourier): improved version of Riemann-Lebesgue	--- The Riemann-Lebesgue lemma is merely a side note of the fact that we need to relate the extension of the Schwartz Fourier transform to L1 to the original one. RL on Schwartz is trivial by embedding into the correct space. - [ ] depends on: #35953 - [ ] depends on: #35954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import	96/29	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Fourier/L1Space.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	66-68721 2 months ago	93-65931 93 days ago	0-1 1 second
36595	mcdoll author:mcdoll	feat(Analysis/TemperedDistribution): polynomially bounded locally integrable functions define tempered distributions	--- - [ ] depends on: #36711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis blocked-by-other-PR	137/0	Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	66-61358 2 months ago	66-61431 66 days ago	0-1 1 second
36529	idontgetoutmuch author:idontgetoutmuch	Connection 1 form scribbles	Some thoughts on connection 1-forms - not meant to be ever merged but here for convenience of discussion	new-contributor t-differential-geometry	496/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/Algebra/FundamentalVectorField.lean,Mathlib/Geometry/Manifold/IntegralCurve/Compact.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	5	2	['github-actions']	nobody	66-58681 2 months ago	unknown	0-0 0 seconds
35295	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): `dropLast` of a cycle is a path	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	13/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	14	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	YaelDillies assignee:YaelDillies	66-50232 2 months ago	39-75713 39 days ago	34-53762 34 days
36327	themathqueen author:themathqueen	feat(Analysis/CStarAlgebra/Extreme): a C⋆-algebra is unital iff there exists an extreme point in the closed unit ball	Co-authored-by: Jon Bannon <59937998+JonBannon@users.noreply.github.com> Co-authored-by: Jireh Loreaux --- - [x] depends on: #35997 - [x] depends on: #36201 - [x] depends on: #36407 - [x] depends on: #36408 - [x] depends on: #36416 - [x] depends on: #36603 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict blocked-by-other-PR	353/0	Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/Extreme.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/Compact.lean	11	7	['github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen']	nobody	66-47915 2 months ago	20-4603 20 days ago	0-783 13 minutes
36119	Ruizsolveall author:Ruizsolveall	feat(Topology/Covering): fundamental group of the circle is ℤ	- Proves that the fundamental group of the circle `π₁(S¹, 0)` is isomorphic to `ℤ`, via covering space theory. - Constructs the winding number map `nLoop : ℤ → Path 0 0` on `AddCircle 1`, and proves it is surjective (`nLoop_surjective`), injective (`nLoop_homotopic_iff`), and additive (`nLoop_add`). - Assembles these into the group isomorphism `windingNumberIso : Multiplicative ℤ ≃* FundamentalGroup (AddCircle 1) 0`. ## Approach Uses the covering map `ℝ → AddCircle 1` and unique path lifting to establish the bijection between homotopy classes of loops and integers (winding numbers). Homotopy invariance of lifted endpoints gives injectivity; surjectivity follows from lifting arbitrary loops. Additivity uses path concatenation of lifts in the simply connected total space `ℝ`. ## AI disclosure I used Claude (Anthropic) to write the PR description, code comments, and to help refine code style. The proof strategy and all Lean code are my own. I understand and can vouch for all the code in this PR.	t-topology new-contributor awaiting-author LLM-generated	236/0	Mathlib.lean,Mathlib/Topology/Covering/FundamentalGroupCircle.lean	2	26	['Ruizsolveall', 'SnirBroshi', 'b-mehta', 'dagurtomas', 'github-actions', 'grunweg', 'vihdzp']	nobody	66-39983 2 months ago	67-32515 67 days ago	8-31258 8 days
31607	grunweg author:grunweg	chore: rename `continuous{,On,At,Within}_const` to `ContinuousFoo.const`	Zulip discussion: [#mathlib4 > Naming convention @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/447491526) --- - [x] depends on: #34441 - [x] depends on: #34688 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated merge-conflict awaiting-CI	352/364	Archive/Hairer.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Continuity.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/BumpFunction/InnerProduct.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/HalfPlane.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Measure.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/PartitionOfUnity.lean,Mathlib/Analysis/Convex/Side.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Continuous.lean,Mathlib/Analysis/InnerProductSpace/Harmonic/HarmonicContOnCl.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Lemmas.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/Normed/Module/Connected.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Isometric.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/PoissonSummation.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSq.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Manifold/Bordism.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/SmoothApprox.lean,Mathlib/MeasureTheory/Function/SpecialFunctions/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/Deriv.lean,Mathlib/NumberTheory/LSeries/Dirichlet.lean,Mathlib/NumberTheory/LSeries/DirichletContinuation.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean	180	15	['github-actions', 'j-loreaux', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-29422 2 months ago	186-22277 186 days ago	0-1 1 second
36347	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): define quadratic number fields as QuadraticAlgebra ℚ d 0	Define `Qsqrtd d` as `QuadraticAlgebra ℚ d 0`, representing the quadratic number field `ℚ(√d)`. Prove trace and norm results, show `Qsqrtd d` is a number field and a quadratic extension when `d` is not a perfect square, and prove that `ℚ(√0)` and `ℚ(√1)` are not fields. Include `IsQuadraticField` as a predicate for quadratic extensions of `ℚ`, and bridge lemmas connecting squarefree integer parameters to the non-square condition. This PR is part of a series upstreaming the [QuadraticNumberFields](https://github.com/FrankieeW/QuadraticNumberFields) project. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/quadratic.20number.20fields) --- ### PRs - #36347 （this PR） - #36387 ---	t-number-theory new-contributor large-import awaiting-author LLM-generated	191/0	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Defs.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/NumberTheory/QuadraticField/Basic.lean	4	29	['FrankieeW', 'eric-wieser', 'github-actions', 'riccardobrasca', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	66-13650 2 months ago	63-50045 63 days ago	7-9258 7 days
36626	SnirBroshi author:SnirBroshi	feat(Order/UpperLower/Basic): an injective function constrained by the identity function using a well-order is the identity	--- (yes I know `IsLowerSet` is bundled but I need the theorems for unbundled relations 🙈) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	30/0	Mathlib/Order/UpperLower/Basic.lean	1	6	['SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	66-8047 2 months ago	21-62232 21 days ago	44-37808 44 days
36619	ldct author:ldct	feat: add `NonUnitalRingHom.ker`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	18/4	Mathlib/RingTheory/Ideal/Maps.lean	1	1	['github-actions']	nobody	65-70687 2 months ago	unknown	0-0 0 seconds
36635	Vierkantor author:Vierkantor	chore(*): turn comments before declarations into docstrings	This PR goes through the whole of Mathlib and replaces `/- comments -/` with `/-- docstrings -/` or `/-! module docs -/` whenever they appear before a declaration. A lot of these appear to be simple typos, where a docstring was actually intended. Where a comment was originally intended, I would argue it is still a good idea include the comments in the generated documentation, or at least it does not hurt anyone. These instances were found by a linter, in an upcoming PR: #36636. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt merge-conflict	255/262	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Subgroup/MulOppositeLemmas.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/Group/Unbundled/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/WeaklyEtale.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Synonym.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Fourier/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Algebra/GelfandMazur.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Counting.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Fintype/Sets.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Set/Pointwise/Support.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeGroup/IsFreeGroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/MaximalSubgroups.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/UnivLE.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalLExpectation.lean,Mathlib/MeasureTheory/Function/JacobianOneDim.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/Measure/Haar/NormedSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/ModelTheory/Algebra/Field/CharP.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BourbakiWitt.lean,Mathlib/Order/CompleteLattice/Basic.lean	140	10	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	65-64960 2 months ago	55-54999 55 days ago	2-9741 2 days
36636	Vierkantor author:Vierkantor	feat(Tactic/Linter): linter for comments that should become docstrings	This PR adds a linter that warns when there is a comment before a declaration which could become a docstring instead. A lot of the instances it spots appear to be simple typos, where a docstring was actually intended. Where a comment was originally intended, I would argue it is still a good idea include the comments in the generated documentation, or at least it does not hurt anyone. Closes: https://github.com/mathlib-initiative/TaskList/issues/41 --- - [ ] depends on: #36635 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter blocked-by-other-PR merge-conflict	314/262	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Subgroup/MulOppositeLemmas.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/Group/Unbundled/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/WeaklyEtale.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Module/Synonym.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Fourier/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Algebra/GelfandMazur.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkCounting.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Fintype/Sets.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Set/Pointwise/Support.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeGroup/IsFreeGroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/MaximalSubgroups.lean,Mathlib/Init.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/UnivLE.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalLExpectation.lean,Mathlib/MeasureTheory/Function/JacobianOneDim.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/Measure/Haar/NormedSpace.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/ModelTheory/Algebra/Field/CharP.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BourbakiWitt.lean	143	5	['adomani', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	65-64421 2 months ago	65-64756 65 days ago	0-45 45 seconds
33506	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): construct a cycle of two distinct paths with same start and end	Co-authored-by: Vlad Tsyrklevich Co-authored-by: Snir Broshi <26556598+SnirBroshi@users.noreply.github.com> --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	109/1	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	4	60	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	65-59018 2 months ago	11-5272 11 days ago	28-65685 28 days
35651	sun123zxy author:sun123zxy	feat(Mathlib/RingTheory/Ideal/Cotangent): `Submodule.map` definition of cotangent spaces	This PR adds an alternative definition of the cotangent space as an image under the R-module quotient map. --- Split from PR #33247 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	47/20	Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	20	['chrisflav', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'sun123zxy']	chrisflav assignee:chrisflav	65-57094 2 months ago	63-38793 63 days ago	16-12398 16 days
36616	EtienneC30 author:EtienneC30	feat: add predicates IsPreBrownian and IsBrownian	The predicate `IsPreBrownian X P` means that, under the probability measure `P`, the finite dimensional laws of the stochastic process `X` are those of the Brownian motion, given by `gaussianProjectiveFamily`. The predicate `IsBrownian X P` means that `X` is pre-Brownian and has almost-surely continuous paths. We prove that a centered Gaussian process with the right covariances is pre-Brownian, as well as basic invariance properties. We also prove that any pre-Brownian motion satisfies the weak Markov property. --- - [ ] depends on: #36472 - [x] depends on: #36615 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR brownian t-measure-probability large-import	796/1	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/Probability/BrownianMotion/Basic.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Moments/Basic.lean	9	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	65-52815 2 months ago	66-32074 66 days ago	0-1 1 second
34911	smmercuri author:smmercuri	feat: idelic product formula	--- - [x] depends on: #34915 - [x] depends on: #34918 - [x] depends on: #36184 - [x] depends on: #36204 - [ ] depends on: #36275 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	262/2	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	8	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	65-46137 2 months ago	101-62813 101 days ago	0-10 10 seconds
16801	awainverse author:awainverse	feat(ModelTheory/Equivalence): The quotient type of formulas modulo a theory	Defines `FirstOrder.Language.Theory.Formula`: `T.Formula α` is the quotient of `L.Formula α` by equivalence modulo a theory `T`. Puts a boolean algebra instance on `T.Formula α`, with `≤` corresponding to implication. --- - [x] depends on: #16799 - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	174/60	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Types.lean	3	30	['YaelDillies', 'awainverse', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	65-44173 2 months ago	563-64804 563 days ago	29-26213 29 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	55	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	65-44149 2 months ago	374-67445 374 days ago	72-2714 72 days
26368	Whysoserioushah author:Whysoserioushah	feat(RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum	Co-authored-by: Jujian Zhang --- Reopened after everything moved to fork (#23320). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	81/0	Mathlib.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	2	7	['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	65-44120 2 months ago	290-81254 290 days ago	36-16237 36 days
27534	PierreQuinton author:PierreQuinton	feat: a typeclass for `sSup`/`sInf` to be lawful	Adds lawful infima and suprema type classes. A preorder with lawful suprema: whenever a set has a least upper bound, `sSup` returns a least upper bound for that set. A preorder with lawful infima: whenever a set has a greatest lower bound, `sInf` returns a greastest lower bound for that set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	26	['PierreQuinton', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	65-44094 2 months ago	180-75169 180 days ago	114-37921 114 days
28151	iehality author:iehality	feat(Computability): r.e. sets are closed under inter/union/projection/composition	Prove that r.e. sets are closed under intersections, unions, projection and composition. --- This PR continues the work from #16705. Original PR: https://github.com/leanprover-community/mathlib4/pull/16705	merge-conflict t-computability awaiting-author	120/0	Mathlib/Computability/Halting.lean	1	13	['YaelDillies', 'github-actions', 'iehality', 'mathlib4-merge-conflict-bot']	nobody	65-44082 2 months ago	272-66106 272 days ago	7-84521 7 days
31610	rudynicolop author:rudynicolop	feat(Computability/NFA): Kleene star closure for Regular Languages via NFA	This PR constructs a Kleene star closure for non-epsilon NFAs, and proves that regular languages are closed under Kleene star. The NFA construction is `NFA.kstar`. The main theorems are: - `NFA.accepts_kstar`: demonstrates that `M.kstar` accepts the Kleene star closure of the language of `M`. - `IsRegular.kstar`: demonstrates that regular languages are closed under Kleene star. There is an onging zulip discussion about regular languages in Mathlib: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553759136 This discussion is also tracked at #24205. Furthermore, the construction and proofs in this PR are heavily inspired by @TpmKranz from his #15651. #15651 supersedes this PR, so if it is accepted then this PR is not needed. --- - [x] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor awaiting-author awaiting-CI	405/7	Mathlib/Computability/NFA.lean	1	16	['YaelDillies', 'ctchou', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	65-44048 2 months ago	124-36430 124 days ago	43-77831 43 days
36716	mcdoll author:mcdoll	chore(Analysis/SchwartzSpace): golf a proof	--- - [ ] depends on: #36711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis blocked-by-other-PR	45/17	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Seminorm.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	63-65504 2 months ago	unknown	0-0 0 seconds
36757	alok author:alok	feat(Order/Filter): add Filter.IsFree and Filter.IsNonprincipal	## Summary Adds two filter predicates and their basic API: - `Filter.IsFree`: no point belongs to every set (`f.ker = ∅`), equivalently `f ≤ cofinite` - `Filter.IsNonprincipal`: not equal to `𝓟 s` for any set `s` Every free `NeBot` filter is non-principal (`IsFree.isNonprincipal`), but the converse fails for general filters (e.g. `𝓝 x` in a non-discrete T₁ space is non-principal but not free). For ultrafilters the two notions coincide (`Ultrafilter.isNonprincipal_iff_isFree`). On finite types, no `NeBot` filter is free (`not_isFree_of_neBot`). ## Test plan - [x] `lake build Mathlib.Order.Filter.Cofinite` passes - [x] `lake build Mathlib.Order.Filter.Ultrafilter.Basic` passes 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-order new-contributor	98/1	Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Ultrafilter/Basic.lean	2	2	['github-actions']	nobody	63-4319 2 months ago	63-2919 63 days ago	0-3928 1 hour
36878	plp127 author:plp127	chore: override `npow` in compositional monoids	If `FooHom` is the type of foo homomorphisms, then `FooHom A A` naturally gets the structure of a monoid by setting one to be the identity homomorphism and setting multiplication to be composition. This PR overrides the `npow` field of this `Monoid` to have `f ^ n` be definitionally equal to `f^[n]`. `FooEquiv A A` also naturally gets a group structure in the same way, this PR overrides the `npow` field to have `f ^ n` be definitionally equal to `f^[n]` and to have `f ^ (n + 1)` be definitionally equal to `f ^ n * f`. This does break one pre-existing definitional equality: when `e : Equiv.Perm α`, `e⁻¹ ^ n = (e ^ n)⁻¹` will no longer be definitional. This PR also sets the `zpow` field of `Group (FooEquiv A A)` instances to `zpowRec (npow := fun n f => f ^ n)`. In the future we may want to change this so that `(f ^ n).toEquiv` is definitionally equal to `f.toEquiv ^ n`. The monoid and group instances to modify are found by searching loogle for `"one_apply"`. The motivation is to make natural number powers commute definitionally with the coercion from `AlgEquiv` to `LinearMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		211/66	Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Order/Group/End.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Star/MonoidHom.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	17	3	['eric-wieser', 'github-actions', 'plp127']	nobody	59-63702 1 month ago	60-9113 60 days ago	0-2503 41 minutes
36404	smmercuri author:smmercuri	feat: the adele ring of a number field is locally compact	--- - [ ] depends on: #30579 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import merge-conflict	539/113	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/LiesOverInstances.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	10	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	58-72594 1 month ago	70-39744 70 days ago	0-264 4 minutes
26221	grunweg author:grunweg	Mr. Covariant Derivatives	This PR is a work in progress, and will land in individual pieces. Some contributions include - additional API for differentiability of vector bundle sections - finite sums, differences and scalar products of smooth sections are smooth - the same result for mdifferentiable - add missing mdifferentiable congruence lemmas - define smooth local frames of a vector bundle - a general tensoriality criterion - define covariant derivatives, proving their tensoriality and that convex combinations of these are covariant derivatives - the classification of covariant derivatives over a trivial bundle - additional API for the Lie bracket of vector fields: the product rule (one sorry left!), Lie bracket at zero vanishes - torsion of a connection, torsion-free connections - Gram-Schmidt procedure for sections of a Riemannian vector bundle - orthonormal frames on a Riemannian vector bundle - connections compatible with a metric; definition of the Levi-Civita connection - uniqueness of the Levi-Civita connection - Christoffel symbols - in progress: existence of the Levi-Civita connection (connection done; torsion-freeness and compatibility in progress) - custom elaborators for sections in a vector bundle (converting dependent to non-dependent functions) - custom elaborators for inferring a model with corners, in differentiability/smoothness definitions - a `#check'` command and tactic which only shows explicit arguments More to come soon! Joint work with @PatrickMassot; supported by the FMJH. --- - [x] depends on: #26360 - [x] depends on: #26672 - [x] depends on: #26673 - [x] depends on: #26674 - [x] depends on: #26864 (more of a by-product) - [x] depends on: #26865 - [x] depends on: #26866 - [x] depends on: #26870 - [x] depends on: #26871 - [x] depends on: #26671 - [x] depends on: #26676 - [x] depends on: #26677 - [x] depends on: #26678 - [x] depends on: #26686 - [x] depends on: #26687 - [x] depends on: #26688 - [x] depends on: #26702 - [x] depends on: #26709 - [x] depends on: #26734 - [ ] depends on: #26743 - [x] depends on: #26894 - [x] depends on: #26921 - [x] depends on: #26922 - [x] depends on: #27020 - [x] depends on: #27021 - [x] depends on: #30307 - [x] depends on: #27023 - [ ] depends on: #27024 - [ ] depends on: #27025 - [x] depends on: #30338 - [ ] depends on: #30083 - [ ] depends on: #30339 - [ ] depends on: #31194 - [ ] depends on: #34262 - [ ] depends on: #34263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR merge-conflict	5847/155	Mathlib.lean,Mathlib/Geometry/Manifold/CheatSheet.md,Mathlib/Geometry/Manifold/Riemannian/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/LeviCivita.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Lift.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Prelim.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Torsion.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Misc.lean,Mathlib/Geometry/Manifold/VectorBundle/OrthonormalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean	18	15	['github-actions', 'grunweg', 'idontgetoutmuch', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	58-66012 1 month ago	unknown	0-0 0 seconds
36825	danlyng author:danlyng	feat(MeasureTheory/Integral/IntegralEqImproper): add Iic variants of nonneg/nonpos derivative integrability and FTC-2	Add the `Iic` counterparts of the existing `Ioi` results for automatic integrability of derivatives on semi-infinite intervals and the corresponding corollaries computing the integral value. Additionally, apply minor fixes to existing docstrings. New declarations: - `integrableOn_Iic_deriv_of_nonneg` / `integrableOn_Iic_deriv_of_nonneg'` - `integrableOn_Iic_deriv_of_nonpos` / `integrableOn_Iic_deriv_of_nonpos'` - `integral_Iic_of_hasDerivAt_of_nonneg` / `integral_Iic_of_hasDerivAt_of_nonneg'` - `integral_Iic_of_hasDerivAt_of_nonpos` / `integral_Iic_of_hasDerivAt_of_nonpos'` These mirror `integrableOn_Ioi_deriv_of_nonneg`, `integrableOn_Ioi_deriv_of_nonpos`, `integral_Ioi_of_hasDerivAt_of_nonneg`, `integral_Ioi_of_hasDerivAt_of_nonpos` and their primed variants.	t-measure-probability new-contributor awaiting-author	107/9	Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean	1	7	['EtienneC30', 'github-actions']	EtienneC30 assignee:EtienneC30	58-54449 1 month ago	58-54449 58 days ago	2-67942 2 days
36973	JovanGerb author:JovanGerb	chore(Order/Filter/AtTopBot/Map): use `to_dual`	This PR uses `to_dual` on 4 declarations. `comap_atTop` is problematic, because the heuristic fails, and mistakenly thinks that it should translate `Surjective.iInf_comp`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	5/20	Mathlib/Order/Filter/AtTopBot/Map.lean	1	2	['github-actions', 'mathlib-bors']	nobody	58-6476 1 month ago	58-6550 58 days ago	0-7 7 seconds
36890	vihdzp author:vihdzp	chore(SetTheory): `le_mul_left` → `le_mul_of_pos_left`	The new theorem names/statements match [`Nat.le_mul_of_pos_left`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Nat/Lemmas.html#Nat.le_mul_of_pos_left). The cardinal one has also been moved to an earlier file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-zulip merge-conflict	28/23	Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Free.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Notation.lean	6	2	['github-actions', 'mathlib-merge-conflicts']	nobody	56-79590 1 month ago	59-66330 59 days ago	0-10825 3 hours
36719	NoneMore author:NoneMore	feat(ModelTheory): add `PartialType` for first-order theories	This PR adds the definitions of partial types over theories and over parameter sets, and proves several equivalent characterizations. --- - [ ] depends on: #36667 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-logic new-contributor	468/0	Mathlib.lean,Mathlib/ModelTheory/PartialTypes.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	5	['NoneMore', 'github-actions', 'mathlib-dependent-issues', 'vihdzp']	nobody	54-73324 1 month ago	63-72678 63 days ago	0-322 5 minutes
36711	mcdoll author:mcdoll	feat(Algebra): Bound `Finset.sum` in terms of `Finset.sup`	We add a version for `Finset` and for seminorms (with the additional `sum_apply` lemma). --- I am not sure where to put the `Finset` lemma, `#find_home` was useless and there seems to be no natural candidate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	34/0	Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Analysis/Seminorm.lean	2	2	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	53-28572 1 month ago	53-28572 53 days ago	10-38227 10 days
37232	mathlib-splicebot author:mathlib-splicebot	chore(Algebra/Order): bound on `\|n / m\|ₘ` and `\|n - m\|`	This PR was automatically created from PR #34722 by @GrigorenkoPV via a [review comment](https://github.com/leanprover-community/mathlib4/pull/34722#discussion_r2996870566) by @Vierkantor.	t-algebra delegated label:t-algebra$	5/0	Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	1	6	['Vierkantor', 'bryangingechen', 'github-actions', 'mathlib-bors']	nobody	53-24351 1 month ago	53-36784 53 days ago	0-588 9 minutes
33295	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Algebra/Central/End): center of the group of automorphisms of a free module	Let `R` be a ring and let `V` be a free `R`-module. We describe the center of the group of linear automorphisms of `V`. The group of linear automorphisms can be summoned either as `V ≃ₗ[R] V`, or as `LinearMap.GeneralLinearGroup R V`, which is a shortcut for `(V →ₗ[R] V)ˣ`. We provide both descriptions. There are three possibilities: * If `V` is trivial, then `V ≃ₗ[R] V` is trivial, and so is its center. * If `V` has rank one, then any basis with a `Unique` type of index furnishes a ring equivalence from `V →ₗ[R] V` with `Rᵐᵒᵖ`, given by right-multiplication on coordinates in the given basis. (This equivalence depends on the choice of a basis.) Then `V ≃ₗ[R] V` is mul-equivalent with `(Rᵐᵒᵖ)ˣ`, hence its center is isomorphic with `Subgroup.center (Rᵐᵒᵖ)ˣ`, or, by commutativity, with `Subgroup.center Rˣ`. * Otherwise, the center of `V ≃ₗ[R] V` consists of homotheties with central ratio, furnishing a group isomorphism from `Subgroup.center (V ≃ₗ[R] V)` with `(Subgroup.center R)ˣ`. When `R` is commutative and `V` is nontrivial, the last two cases give the same answer and the center of `V ≃ₗ[R] V` is isomorphic with `Rˣ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP merge-conflict label:t-algebra$	364/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/GeneralLinearGroup/Center.lean	3	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	53-7093 1 month ago	143-36761 143 days ago	0-19130 5 hours
36769	jjdishere author:jjdishere	feat(Valued/ValuationTopology): creating instances of `IsValuativeTopology`	This is the third in a series of PRs, with the final goal of removing the class `Valued` from Mathlib. A `Valued` instance will be replaced by `[ValuativeRel R] [UniformSpace R] [IsValuativeTopology R] [IsUniformAddGroup R] (v : Valuation R A) [v.Compatible]`. The goal of this PR is to prepare APIs for creating `ValuativeRel`, `IsValuativeTopology`, ... instances whenever a `Valued` instance was created. Currently in Mathlib, there are three main ways of creating a `Valued` instance: 1. `Valued.mk'` (`ValuativeRel.ofValuation` already in mathlib, ValuativeRel.uniformSpace in #36532) 2. `Valued.valuedCompletion` 3. `NormedField.toValued` For the later two methods, we create corresponding APIs to equip `IsValuativeTopology` under the original input. Some uniform space structures induced by `ValuativeRel` in this PR cannot be made into instances immediately, since they would cause diamonds with `Valued`. However, they will become instances in the final PR removing `Valued`. ## More about the whole refactor plan: 1. Copy APIs that take `Valued` as input and make them accept input `[ValuativeRel R] [UniformSpace R] [IsValuativeTopology R] [IsUniformAddGroup R] (v : Valuation R A) [v.Compatible]`. - [x] #36532 2. For every API that introduces a `Valued` instance, copy that API and make it create `[ValuativeRel R] [UniformSpace R] [IsValuativeTopology R] [IsUniformAddGroup R]` instances. And for every instance that currently exists in Mathlib, create the above series of instances as much as possible without introducing diamonds. More specifically, currently in Mathlib, there are three main ways of creating a `Valued` instance: - `Valued.mk'` - `Valued.valuedCompletion` - `NormedField.toValued` For each of these we create APIs to create the above series of instances. - [ ] #36777 [Generalize the definition of `IsValuativeTopology` to non comm rings] - [ ] This PR. For each of these we create APIs to create the above series of instances. 3. A big PR deprecating the `Valued` class using 1 and 2. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #36532 - [ ] depends on : #36777 - [ ] depends on : #36911	t-topology WIP t-algebra t-ring-theory merge-conflict label:t-algebra$	752/492	Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/Padics/Complex.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/DiscreteValuativeRel.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean,Mathlib/Topology/Algebra/ValuativeRel/Completion.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	25	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	53-3655 1 month ago	62-51992 62 days ago	0-56 56 seconds
36911	jjdishere author:jjdishere	fix(RingTheory/Valuation): change `ValueGroup` from taking HomClass to Hom	This PR refactors `MonoidWithZeroHom.valueMonoid`, `MonoidWithZeroHom.valueGroup`, `MonoidWithZeroHom.ValueGroup₀`, and `MonoidWithZeroHom.ValueGroup₀.embedding` to take a concrete `MonoidWithZeroHom` as input instead of a `MonoidWithZeroHomClass` instance, following rules described in [#mathlib4 > Mathlib's morphism hierarchy @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Mathlib.27s.20morphism.20hierarchy/near/554383157) As a result, we are able to remove several `erw` and many `set_option backward.isDefEq.respectTransparency false in`. The trade-off (foreseen by the same zulip thread) is that we now need to write an explicit coercion to `MonoidWithZeroHom` in `ValueGroup₀ (Valued.v (R := R) : R →*₀ Γ₀)`. Additionally, this PR fixes an instance on `NNReal`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #36532 - [ ] depends on: #36777	t-ring-theory tech debt blocked-by-other-PR merge-conflict	559/483	Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/Padics/Complex.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/DiscreteValuativeRel.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	24	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	53-3648 1 month ago	59-35515 59 days ago	0-60 1 minute
37184	dagurtomas author:dagurtomas	feat(CategoryTheory): start using the map attribute	--- - [ ] depends on: #37183 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	259/41	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Localization/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/Map.lean	13	2	['github-actions', 'mathlib-dependent-issues']	nobody	52-48110 1 month ago	54-22223 54 days ago	0-1 1 second
37275	dagurtomas author:dagurtomas	chore(CategoryTheory): use the map attribute more	--- - [ ] depends on: #37184 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	283/77	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Functor/Trifunctor.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Localization/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/NatTrans.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/Map.lean	24	2	['github-actions', 'mathlib-dependent-issues']	nobody	52-45028 1 month ago	52-45528 52 days ago	0-1 1 second
32295	jsm28 author:jsm28	feat(Archive/Imo/Imo2024Q4): IMO 2024 Q4	Add a formalization of IMO 2024 problem 4, so completing the formalizations of all six IMO 2024 problems. --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #31057 - [ ] depends on: #31205 - [ ] depends on: #31452 - [ ] depends on: #31495 - [ ] depends on: #31733 - [ ] depends on: #31891 - [ ] depends on: #31892 - [ ] depends on: #31893 - [ ] depends on: #31979 - [ ] depends on: #31981 - [ ] depends on: #32004 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32023 - [ ] depends on: #32259 - [ ] depends on: #32260 - [ ] depends on: #32270 - [ ] depends on: #32273 - [ ] depends on: #32278 - [ ] depends on: #32282 - [ ] depends on: #32290 - [ ] depends on: #32294 - [ ] depends on: #32296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO blocked-by-other-PR	1195/2	Archive.lean,Archive/Imo/Imo2024Q4.lean,Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Incenter.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean	7	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	52-37626 1 month ago	169-16394 169 days ago	0-2910 48 minutes
36706	kim-em author:kim-em	feat(Tactic/FastInstance): warn when a synthesized sub-instance has leaky binder types	This PR adds a warning to `fast_instance%` and `inferInstanceAs%` when they encounter a synthesized sub-instance that has leaky data-field binder types. When `fast_instance%` recursively normalizes a class instance, it uses `trySynthInstance` to find canonical sub-instances. If a found sub-instance is not canonical at instances transparency (i.e., its internal lambda binder types reference an unexpanded type alias instead of the target carrier), the tool now emits a warning: ``` fast_instance%: 'leakySub' (for SubClass MyNat) has leaky data-field binder types, which may cause `isDefEq` failures at instances transparency (e.g. in `grind`). Consider redefining it with `fast_instance%` or `inferInstanceAs%`. To suppress: `set_option Elab.fast_instance.warnLeakySubInstances false` ``` The leakiness check uses `withDisabledInstance` to temporarily evict the sub-instance from the discrimination tree (preventing trivial self-match via `trySynthInstance`), then compares against the canonical form at instances transparency. A `warnLeaky` parameter propagates through recursive calls to prevent nested warnings. The warning is suppressed via `set_option Elab.fast_instance.warnLeakySubInstances false`. - [ ] depends on: #36701 🤖 Prepared with Claude Code	t-meta blocked-by-other-PR large-import LLM-generated merge-conflict	415/21	Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/Init.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean,MathlibTest/InferInstanceAsPercent.lean	11	7	['Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	52-28702 1 month ago	64-6407 64 days ago	0-1003 16 minutes
37249	yuma-mizuno author:yuma-mizuno	feat(Algebra): add multivariate Laurent polynomials	--- ~~I used Codex to imitate the `MvPolynomial` API.~~ Now it has been rewritten by hand to focus on its `AddMonoidAlgebra` features. Proving `UniqueFactorizationMonoid` is my next plan. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	268/0	Mathlib.lean,Mathlib/Algebra/MvLaurentPolynomial/Basic.lean	2	5	['YaelDillies', 'eric-wieser', 'github-actions', 'yuma-mizuno']	nobody	52-21246 1 month ago	52-80449 52 days ago	0-26623 7 hours
37436	RemyDegenne author:RemyDegenne	feat: UniformIntegrable lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP brownian t-measure-probability	109/0	Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean	3	1	['github-actions']	nobody	48-57632 1 month ago	unknown	0-0 0 seconds
37429	RemyDegenne author:RemyDegenne	feat: API for stoppedValue and StoppedProcess	Co-authored-by: Thomas Zhu Co-authored-by: Alessio Rondelli --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability awaiting-author	37/3	Mathlib/Probability/Process/Stopping.lean	1	3	['EtienneC30', 'github-actions']	nobody	48-57366 1 month ago	48-57366 48 days ago	0-6963 1 hour
37294	eric-wieser author:eric-wieser	feat(MatrixExponential): remove some rat-algebra arguments	[#Is there code for X? > Algebra structures being induced @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Algebra.20structures.20being.20induced/near/582277644) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #37292	t-analysis	89/8	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	47-60244 1 month ago	unknown	0-0 0 seconds
36728	chenson2018 author:chenson2018	feat: linter for terminal squeezes	See discussion at [#mathlib4>linter requests@576559620 ](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/linter.20requests/near/576559620). This PR adds a linter that indicates when a flexible terminal tactic is squeezed and can be replaced by the unsqueezed equivalent. Like the other tactic analysis linters, this is off by default and intended for periodic reports. At the moment, this includes only `simp` and `simp_all`, just like the flexible linter, and does not take the further step of removing unused `simp` arguments. The style guide specifies that > a simp call is terminal if it closes the current goal or is only followed by flexible tactics and this linter complies with this by checking not only for "literal terminal" tactics that are syntactically the last to close a goal but also for "block terminal" tactics that are only followed by tactics permitted to follow a flexible tactic. (This terminology is not standard, but is a nice suggestion by @adomani) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter awaiting-author	109/1	Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/TacticAnalysis.lean	3	11	['SnirBroshi', 'chenson2018', 'github-actions', 'grunweg']	thorimur assignee:thorimur	47-59195 1 month ago	47-68946 47 days ago	12-13181 12 days
37507	gasparattila author:gasparattila	chore(Topology/Algebra/Module/Star): tag continuity lemmas with `fun_prop`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy delegated	4/4	Mathlib/Topology/Algebra/Module/Star.lean	1	3	['gasparattila', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	47-42171 1 month ago	47-42171 47 days ago	0-2151 35 minutes
37101	fsefzig author:fsefzig	feat: definition of kummer polynomials and prove that AdjoinRoot (KummerPolynomial n s) is etale	This defines the Kummer polynomial ` KummerPolynomial n s := X^n - s` over a ring R and constructs the following instances for `AdjoinRoot (KummerPolynomial n s)`: · Faithfullyflat · SmoothOfRelativeDimension 0 · Etale	t-ring-theory new-contributor awaiting-author	345/0	Mathlib.lean,Mathlib/RingTheory/AdjoinRootKummer.lean	2	24	['acmepjz', 'chrisflav', 'fsefzig', 'github-actions', 'vihdzp']	nobody	47-38908 1 month ago	unknown	0-0 0 seconds
37585	cascone26 author:cascone26	feat: formal statements of Robin's and Lagarias' inequalities equivalent to RH	## Summary This PR adds `Mathlib/NumberTheory/LSeries/RobinInequality.lean`, which contains formal Lean 4 statements of two classical equivalences of the Riemann Hypothesis: Robin's theorem (1984): RH ↔ σ₁(n) < e^γ · n · ln(ln(n)) for all n > 5040 Lagarias' theorem (2002): RH ↔ σ₁(n) ≤ H_n + exp(H_n) · ln(H_n) for all n ≥ 1 ### New declarations - `robinBound (n : ℕ) : ℝ` — the Robin bound e^γ · n · ln(ln(n)) - `lagariasBound (n : ℕ) : ℝ` — the Lagarias bound H_n + exp(H_n) · ln(H_n) - `robin_iff_RH : RiemannHypothesis ↔ ∀ n > 5040, σ₁(n) < robinBound n` - `lagarias_iff_RH : RiemannHypothesis ↔ ∀ n ≥ 1, σ₁(n) ≤ lagariasBound n` ### Status The statements are complete and use existing Mathlib primitives: - `ArithmeticFunction.sigma` for σ₁ - `Real.eulerMascheroniConstant` for γ - `harmonic` for H_n (with ℚ → ℝ coercion) - `RiemannHypothesis` from `Mathlib.NumberTheory.LSeries.RiemannZeta` The proofs are currently `sorry`. The Robin direction (RH → inequality) requires analytic number theory following Robin's original 1984 paper. The converse uses Gronwall's theorem on superior highly composite numbers. Both are substantial Mathlib projects in their own right. This PR establishes the formal statements as a foundation for future proof work. These equivalences are not currently formalized anywhere in Mathlib. ### References - G. Robin, Grandes valeurs de la fonction somme des diviseurs et hypothèse de Riemann, J. Math. Pures Appl. 63 (1984), 187–213. - J. Lagarias, An elementary problem equivalent to the Riemann hypothesis, Amer. Math. Monthly 109 (2002), 534–543. ### Note on `sorry` I'm aware Mathlib does not merge `sorry`-laden PRs in general. I'm submitting this as a draft to: 1. Get feedback on whether the statement formulation is idiomatic 2. Establish that these statements don't already exist in Mathlib under a different name 3. Invite collaboration on completing the proofs	t-number-theory new-contributor	98/0	Mathlib/NumberTheory/LSeries/RobinInequality.lean	1	2	['github-actions']	nobody	45-84073 1 month ago	unknown	0-0 0 seconds
36937	Yaohua-Leo author:Yaohua-Leo	feat(Algebra/Jordan): add first linearization lemmas for IsCommJordan	[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) AI assistance disclosure: I used AI assistance for CI/debugging and module-structure fixes in this PR. The mathematical content and main lemmas were written by me, with help from @pelicanhere. This PR adds a new file `Mathlib/Algebra/Jordan/Linearization.lean` containing linearization lemmas for the commutative Jordan identity. Main declarations: * `IsCommJordan.four_nsmul_associator_mul_add` * `IsCommJordan.associator_mul_add` These lemmas formalize a first linearization of the commutative Jordan identity using `associator`, following McCrimmon, Proposition 1.8.5. --- I put these lemmas in a separate file because I expect follow-up linearization lemmas to belong naturally in the same place. I am also happy to rename declarations or move the file if reviewers would prefer.	t-algebra new-contributor awaiting-author label:t-algebra$	60/0	Mathlib.lean,Mathlib/Algebra/Jordan/Linearization.lean	2	6	['Yaohua-Leo', 'github-actions', 'grunweg', 'ocfnash']	ocfnash assignee:ocfnash	45-63420 1 month ago	45-63420 45 days ago	13-10710 13 days
36813	AlexeyMilovanov author:AlexeyMilovanov	feat(Computability.Encoding): add self-delimiting unary and pair encodings	Adds `unaryPrefix` (a self-delimiting $1^n 0$ code) and `prefixPair` to `Mathlib.Computability.Encoding`. Key changes: * `unaryPrefix`: A prefix-free unary encoding for $\mathbb{N}$, distinct from the existing `unaryEncodeNat`. * `unaryPrefix_append_inj`: A basic cancellation lemma that allows unique extraction of a unary prefix from a concatenated list. * `prefixPair`: A self-delimiting pairing function for boolean lists, defined as $\text{unaryPrefix } \|x\| \frown x \frown y$. * `prefixPair_inj`: A concise proof of pair injectivity leveraging the new prefix lemmas.	t-computability new-contributor awaiting-author	56/1	Mathlib/Computability/Encoding.lean	1	2	['Komyyy', 'github-actions']	Komyyy assignee:Komyyy	45-4441 1 month ago	45-4441 45 days ago	16-42277 16 days
37644	matthunz author:matthunz	feat(Order/Causal): add `Causal` ordering for stream functions	Adds `Causal` ordering for stream functions and related theorems: ```lean def Causal (f : Stream' α → Stream' β) : Prop := ∀ (x y : Stream' α) (t : ℕ), (∀ s, s ≤ t → x s = y s) → f x t = f y t ``` A stream function is causal if the output at time `t` depends only on inputs up to time `t`. Causal stream functions are commonly used in signal processing, reactive systems, and semantics of stateful computations, where outputs cannot depend on future inputs. ## Future work - Mealy machines: define Mealy machines as causal stream functions with state, and relate them to standard automata-theoretic constructions. - Feedback and delay operators: formalize feedback loops and delayed composition, enabling modeling of stateful and recursive stream definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	79/0	Mathlib.lean,Mathlib/Order/Causal/Basic.lean,Mathlib/Order/Causal/Defs.lean	3	2	['github-actions']	nobody	44-29904 1 month ago	unknown	0-0 0 seconds
36893	Komyyy author:Komyyy	feat: make `Primrec` and `Computable` `fun_prop` preds	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	248/92	Mathlib/Computability/Primrec/Basic.lean,comment_out.sh,uncomment.sh	3	2	['github-actions', 'mathlib-merge-conflicts']	nobody	43-69314 1 month ago	unknown	0-0 0 seconds
37663	khwilson author:khwilson	feat(NumberTheory/ArithmeticStatistics/Reducible): Counting reducible polynomials	A result of van der Waerden critical in arithmetic statistics which shows that the number of reducible monic polynomials of degree n is O(H^(n-1)). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		441/2	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Data/Set/Card.lean,Mathlib/NumberTheory/ArithmeticStatistics/Reducible.lean,Mathlib/NumberTheory/MahlerMeasure.lean	4	1	['github-actions']	nobody	43-56363 1 month ago	unknown	0-0 0 seconds
37160	vihdzp author:vihdzp	feat: product of Coxeter matrices	The Coxeter matrix `A * B` is the block matrix `!![A, 2; 2, B]`. --- I've used multiplication to denote this under the logic that the product of Coxeter groups has a Coxeter matrix given by this construction. Perhaps this isn't desirable, considering it doesn't match matrix multiplication. I'm open to suggestions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory WIP	13/3	Mathlib/GroupTheory/Coxeter/Matrix.lean	1	5	['github-actions', 'mathlib-bors', 'tb65536', 'vihdzp']	tb65536 assignee:tb65536	42-47667 1 month ago	42-47674 42 days ago	12-13791 12 days
37690	yuanyi-350 author:yuanyi-350	feat(Combinatorics/Enumerative/Bell): sum over partition shapes	## Summary - add multiplicative lemmas relating `Multiset.bell` when inserting a part - prove `Nat.bell` as a sum of `Multiset.bell` over partition shapes - Kill TODO in `Mathlib/Combinatorics/Enumerative/Bell.lean` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	153/16	Mathlib/Combinatorics/Enumerative/Bell.lean	1	1	['github-actions']	nobody	41-74359 1 month ago	42-72984 42 days ago	42-72977 42 days
37730	RemyDegenne author:RemyDegenne	feat: define total variation distance	Define the total variation distance between two finite measures, using the variation of the difference seen as signed measures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP t-measure-probability	56/0	Mathlib.lean,Mathlib/InformationTheory/TotalVariation/Basic.lean	2	1	['github-actions']	nobody	41-72174 1 month ago	41-72512 41 days ago	0-1 1 second
37695	Morten-Ness author:Morten-Ness	refactor(GroupTheory/Complement): simplify complement proofs	Simplifies the proofs of: - `Subgroup.IsComplement'.symm` - `Subgroup.isComplement_singleton_left` - `Subgroup.isComplement_singleton_right` No API changes. AI assistance: I used Codex/LLM suggestions as a starting point, then manually checked the proofs, and verified the final version locally. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor awaiting-author	15/17	Mathlib/GroupTheory/Complement.lean	1	4	['github-actions', 'tb65536']	tb65536 assignee:tb65536	41-71594 1 month ago	41-71594 41 days ago	0-68801 19 hours
37489	michael-novak-math author:michael-novak-math	feat: add the fundamental theorem of plane curves	We add to the PlaneCurves file created in PR #36731 a classical result in the subject of differential geometry of plane curves: the fundamental theorem of plane curves. --------- - [ ] depends on: #36731	new-contributor t-differential-geometry t-analysis blocked-by-other-PR	651/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/PlaneCurves.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	5	['github-actions', 'mathlib-dependent-issues', 'michael-novak-math']	nobody	41-62174 1 month ago	47-47030 47 days ago	0-13581 3 hours
37757	JovanGerb author:JovanGerb	chore(Order/liminfLimsup): use `to_dual`	This PR uses `to_dual` on `limsup`. This PR still depends on many other PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		86/251	Mathlib/Order/LiminfLimsup.lean,Mathlib/Tactic/Translate/ToDual.lean	2	2	['github-actions', 'mathlib-bors']	nobody	41-49227 1 month ago	41-49281 41 days ago	0-8 8 seconds
37642	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph): tidy various files	--- Concept inspired by @Ruben-VandeVelde :) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	89/72	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Subwalks.lean	8	2	['SnirBroshi', 'github-actions']	nobody	41-38318 1 month ago	41-38378 41 days ago	43-55008 43 days
37057	erdOne author:erdOne	feat(AlgebraicTopology): `SimplexCategory.toTop_map_δ_apply`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology maintainer-merge awaiting-author merge-conflict	48/2	Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Data/Fin/SuccPred.lean	5	17	['Raph-DG', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'riccardobrasca']	robin-carlier assignee:robin-carlier	40-81521 1 month ago	42-42761 42 days ago	4-49805 4 days
36936	Rida-Hamadani author:Rida-Hamadani	feat(CategoryTheory): PBW Theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	141/0	Mathlib/CategoryTheory/Monad/PBW.lean	1	1	['github-actions']	nobody	40-77027 1 month ago	unknown	0-0 0 seconds
37652	yuanyi-350 author:yuanyi-350	feat(ProbabilityTheory/MeasureTheorey): Add Coupling lemma	## Summary This PR formalizes a standard coupling bound on countable measurable spaces. More precisely, for a probability measure `μ` and measurable maps `Y Z : Ω → S` with `S` countable, it proves the `L¹` bound `∑' k : S, \|(μ.map Y).real ({k} : Set S) - (μ.map Z).real ({k} : Set S)\| ≤ 2 * μ.real {ω \| Y ω ≠ Z ω}`. ## Main changes - add `tsum_restrict_preimage_singleton_eq` and `tsum_restrict_preimage_singleton_eq'` in `MeasureTheory/Measure/Restrict.lean`; - add `tsum_measureReal_restrict_preimage_singleton_eq`, `coupling_term_bound`, and `coupling_lemma` in `MeasureTheory/Measure/Real.lean`; - include some local cleanup in `MeasureTheory/Measure/Real.lean`, mainly simplifying `toReal`-related arguments and notation. ## References - Wikipedia: https://en.wikipedia.org/wiki/Coupling_(probability) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	107/36	Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Restrict.lean	2	3	['EtienneC30', 'RemyDegenne', 'github-actions']	kex-y assignee:kex-y	40-70153 1 month ago	41-71102 41 days ago	2-15319 2 days
37281	AltSoKoly author:AltSoKoly	Update EdgeConnectivity.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	123/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Data/Int/GCD.lean	2	5	['github-actions', 'grunweg', 'themathqueen']	nobody	40-50785 1 month ago	52-41548 52 days ago	0-432 7 minutes
37344	vihdzp author:vihdzp	feat: monotone function `Cardinal → α` is eventually constant	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order awaiting-author	57/0	Mathlib.lean,Mathlib/Logic/Small/Basic.lean,Mathlib/SetTheory/Cardinal/EventuallyConst.lean	3	3	['YaelDillies', 'github-actions', 'vihdzp', 'wwylele']	YaelDillies assignee:YaelDillies	39-75494 1 month ago	39-75494 39 days ago	10-47007 10 days
37697	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Clique): add theorems about cliques and induced graphs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	22/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	9	['Rida-Hamadani', 'SnirBroshi', 'github-actions']	nobody	39-26486 1 month ago	42-50931 42 days ago	42-50924 42 days
37111	tannerduve author:tannerduve	feat(Computability): add Nat.PrimrecIn and PrimrecIn	- Add `Nat.PrimrecIn`: primitive recursive functions relative to a set of oracles - Add `PrimrecIn`: lifts `Nat.PrimrecIn` to `Primcodable` types A `PrimrecIn` version of `RecursiveIn.iff_nat` (i.e., `PrimrecIn O (f : ℕ → ℕ) ↔ Nat.PrimrecIn O f`) is left as future work as it requires proving `Nat.PrimrecIn O Nat.pred`, which needs additional API for `Nat.PrimrecIn`. --- Split out from #34937 as requested in review. - [x] depends on: #37061	t-computability new-contributor awaiting-author	24/0	Mathlib/Computability/RecursiveIn.lean	1	14	['Komyyy', 'bryangingechen', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tannerduve']	nobody	38-29298 1 month ago	39-42157 39 days ago	1-79421 1 day
36733	xroblot author:xroblot	feat(RamificationInertia): decomposition field and inertia field of subfields	If `D` (resp. `E`) is the decomposition (resp. inertia) field of `P` in `L/K` and `F` is a subextension, then the decomposition (resp. inertia) field of the prime of `F` below `P` in `F/K` is` D ⊓ F` (resp. `E ⊓ F`). --- - [ ] depends on: #36544 - [ ] depends on: #35991 - [x] depends on: #36391. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	818/31	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean,Mathlib/RingTheory/Ideal/Galois.lean	13	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	38-23343 1 month ago	63-51758 63 days ago	0-48 48 seconds
36763	alok author:alok	refactor(Order/Filter/Germ): partial sections for Filter.Product	## Summary - Refactor `Filter.Product` from total functions to partial sections (`Product.Section`) with filter-large domains - Adapt the model-theoretic `Prestructure` and Łoś's theorem proofs to partial sections - Add `Germ ↔ Product` bridge equivalence for constant families ## Motivation The current `Filter.Product` is a quotient of total functions `(a : α) → ε a` by eventual equality. This requires all fibers to be inhabited, which is not the mathematically correct construction. The ultraproduct should only require a section defined on a filter-large set. The new `Product.Section` structure carries: - A domain `dom : Set α` with `dom ∈ l` - A dependent section `val : (a : dom) → ε a` Two sections are equivalent if they agree on some filter-large common domain. This matches the standard mathematical construction and enables proper ultraproducts where some fibers may be empty. ## Changes ### `Mathlib/Order/Filter/Germ/Basic.lean` - New `Product.Section` structure (partial section with filter-large domain) - `productSetoid` redefined over `Product.Section` - `Product.ofTotal` embeds total sections; `eq_iff_ofTotal` characterizes equality ### `Mathlib/ModelTheory/Ultraproducts.lean` - `sectionStructure`: first-order structure on partial sections (funMap restricts to domain intersection, RelMap checks on common domain) - `setoidPrestructure` adapted with full proofs of `fun_equiv` and `rel_equiv` - `funMap_cast`, `boundedFormula_realize_cast` (rel case), `all` quantifier case all reproved for partial sections - Łoś's theorem statement unchanged; `sentence_realize` still has the same API ### `Mathlib/Order/Filter/Germ/Product.lean` (new) - `Germ.toProduct` / `Product.toGerm`: round-trip between germs and constant-family products - `Germ.prodEquiv`: equivalence for inhabited constant families (backward compat) ## Test plan - [x] `lake build` passes (7607/7607 modules) - [x] All linter warnings resolved - [x] `Mathlib.ModelTheory.Satisfiability` (uses `Filter.Product` + `sentence_realize`) still compiles - [x] `Mathlib.Analysis.Real.Hyperreal` still compiles --- Context: [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Nonstandard.20Analysis/near/513178715) — Violeta Hernández asked for fixing the ultraproduct definition as the first step after #33650 deprecated the old hyperreal machinery. 🤖 Generated with [Claude Code](https://claude.com/claude-code)	new-contributor merge-conflict	278/49	Mathlib.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Filter/Germ/Product.lean	4	5	['alok', 'github-actions', 'mathlib-merge-conflicts', 'plp127']	nobody	38-23342 1 month ago	unknown	0-0 0 seconds
36764	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `DirectSum.lequivCongrLeft_lof`: unchanged 🎉 * `AnalyticOnNhd.preimage_mem_codiscreteWithin`: unchanged 🎉 * `mem_permsOfList_of_mem`: unchanged 🎉 * `PNat.mod_le`: unchanged 🎉 * `Computation.map_parallel`: unchanged 🎉 * `Sigma.curry_update`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		11/41	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Sigma/Basic.lean	6	13	['chenson2018', 'euprunin', 'github-actions', 'mathlib-merge-conflicts']	nobody	37-77177 1 month ago	37-77237 37 days ago	62-49009 62 days
37055	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `OreLocalization.smul'_char`: unchanged 🎉 * `Equiv.Perm.cycleOf_mem_cycleFactorsFinset_iff`: unchanged 🎉 * `StrictMono.ite'`: unchanged 🎉 * `Mathlib.Meta.NormNum.isInt_ediv`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		10/29	Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Tactic/NormNum/DivMod.lean	4	11	['chenson2018', 'euprunin', 'github-actions']	nobody	37-74817 1 month ago	37-74878 37 days ago	55-72455 55 days
36989	MichaelStollBayreuth author:MichaelStollBayreuth	feat(NumberTheory/Height/EllipticCurve): new file	This PR defines the "addition-and-subtraction map" on x-coordinates of pairs of points on elliptic curves and proves an inequality for the logarithmic height of the image. In a later PR, we will show that the map thus defined indeed comes from addition and subtraction on an elliptic curve. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory awaiting-author	214/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/AddSubMap.lean,Mathlib/NumberTheory/Height/EllipticCurve.lean	3	20	['MichaelStollBayreuth', 'Multramate', 'github-actions', 'riccardobrasca']	Multramate and riccardobrasca assignee:Multramate assignee:riccardobrasca	37-45506 1 month ago	37-45506 37 days ago	18-11884 18 days
37700	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Maps): add `Iso.induceIso`	Similar to `induceHom` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	29/0	Mathlib/Combinatorics/SimpleGraph/Maps.lean	1	3	['github-actions', 'vlad902']	nobody	37-33730 1 month ago	37-33788 37 days ago	42-46098 42 days
37954	jdhart81 author:jdhart81	feat(Data/ENNReal/Inv): add ENNReal.div_mul_div_cancel	Proves a / b * (b / c) = a / c for b ≠ 0, b ≠ ∞ in ENNReal. Proof via mul_div_assoc and existing div_mul_cancel. AI Disclosure: This PR was developed with assistance from an LLM (Claude, Anthropic) for proof exploration and text drafting. The proof was compiled and verified locally by the contributor, who understands the mathematical content. This lemma is extracted from a larger formalization of information-theoretic bounds (Zenodo DOI: 10.5281/zenodo.19317983). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	5/0	Mathlib/Data/ENNReal/Inv.lean	1	2	['github-actions']	nobody	36-52157 1 month ago	36-52155 36 days ago	0-75 1 minute
36744	farmanb author:farmanb	feat(CategoryTheory/Abelian/TorsionTheory): Introduce torsion theory for abelian categories	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	329/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/TorsionTheory/Basic.lean	2	11	['farmanb', 'github-actions', 'joelriou', 'plp127']	nobody	36-50966 1 month ago	unknown	0-0 0 seconds
37817	artie2000 author:artie2000	refactor(RingTheory/Ideal): standardise `RingHom` and `AlgHom` lifting API	* Change `AlgHom.liftOfSurjective` to use the same set-up as `RingHom.liftOfSurjective` * Add lemmas until both operations have the same API * Make `RingHom.liftOfRightInverse_comp_apply` a `simp` lemma * Rename `AlgHom.liftOfSurjective_apply` to match `RingHom.liftOfSurjective_apply_comp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	125/32	Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/LocalRing/ResidueField/Polynomial.lean	5	1	['github-actions']	nobody	36-25183 1 month ago	36-25126 36 days ago	0-1401 23 minutes
37751	JovanGerb author:JovanGerb	chore(Order/Filter/IsBounded): use `to_dual`	use `to_dual` for `Filter.IsBounded` --- - [ ] depends on: #37747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	120/378	Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Order/Filter/AtTopBot/Basic.lean,Mathlib/Order/Filter/IsBounded.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	35-23143 1 month ago	41-49208 41 days ago	0-1523 25 minutes
38039	themathqueen author:themathqueen	chore(Topology): `UniformSpace.Completion` renames for morphisms	- [ ] `UniformSpace.Completion.mapRingHom` -> `UniformSpace.RingHom.completion` - [ ] --- Just starting this now so that I don't forget again. Will hopefully get to it soon. See Zulip thread: [#mathlib4 > naming convention: `UniformSpace.Completion` morphisms](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.3A.20.60UniformSpace.2ECompletion.60.20morphisms) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-topology	24/11	Mathlib/Topology/Algebra/UniformRing.lean	1	1	['github-actions']	nobody	34-56584 1 month ago	unknown	0-0 0 seconds
38040	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): Add direct product instance	Adds that the direct product of two finitely presented groups are finitely presented. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	7/0	Mathlib/GroupTheory/FinitelyPresentedGroup.lean	1	5	['copilot-pull-request-reviewer', 'github-actions', 'homeowmorphism', 'mathlib-bors']	nobody	34-48451 1 month ago	34-52317 34 days ago	0-7 7 seconds
38017	kbuzzard author:kbuzzard	perf(Algebra/Ring): faster Ring.toAddGroupWithOne instance	An attempt to manually make `Ring.toAddGroupWithOne` a fast instance. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [#mathlib4 > instance unfolding phenomenon @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/instance.20unfolding.20phenomenon/near/585295822)	WIP t-algebra merge-conflict label:t-algebra$	64/18	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Data/Int/Cast/Defs.lean	7	7	['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-radar']	nobody	33-85928 1 month ago	35-28301 35 days ago	0-2 2 seconds
37050	artie2000 author:artie2000	DRAFT refactor: remove `ConvexCone`	This draft PR deletes all downstream references to `ConvexCone` --- - [ ] depends on: #37053 - [x] depends on: #37054 - [x] depends on: #37058 - [ ] depends on: #37420 - [ ] depends on: #37298 - [ ] depends on: #36605 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR large-import merge-conflict	114/173	Mathlib/Algebra/Group/Subgroup/Order.lean,Mathlib/Algebra/Group/Submonoid/Support.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	7	14	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	33-50401 1 month ago	56-38566 56 days ago	0-1478 24 minutes
36770	Xmask19 author:Xmask19	feat: invariance of domain via Brouwer's fixed point theorem	Continuous and injective maps from Rn to Rn are open mappings. This is shown given Brouwer's fixed point theorem. The specific version of Brouwer's theorem assumed is that a continuous map from the closed unit ball to itself has a fixed point. It is used to show a lemma in this proof. Then assuming that invariance of domain isn't true gives a contradiction with this lemma. --- My supervisor has code for studying topological manifolds which relies on invariance of domain that can be found here: https://github.com/stevensivek/TopologicalManifolds and is planned to be submitted to Mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	617/5	Mathlib.lean,Mathlib/AlgebraicTopology/InvarianceOfDomain.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Order.lean	5	2	['github-actions']	nobody	33-36419 1 month ago	33-36395 33 days ago	0-6926 1 hour
37865	Jun2M author:Jun2M	feat(Combinatorics/Graph): Edge cut of `Graph`	This PR introduces - `edgeCut`: A function on set of vertices that returns the set of edges with exactly one end in the set. - `IsEdgeCut`: A predicate for set of edges that promises it is `edgeCut` of some set. - `IsBridge`: An edge `e` is a bridge iff it is a singleton edge cut. - `IsBond`: An edge Set `B` is bond iff it is minimal nonempty edge cut. --- - [x] depends on: #35879 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	194/0	Mathlib/Combinatorics/Graph/Connected/EdgeCut.Lean,Mathlib/Combinatorics/Graph/Subgraph.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	33-31546 1 month ago	33-49203 33 days ago	33-49634 33 days
38050	WilliamCoram author:WilliamCoram	feat: Define Newton polygons	In this file we construct a method to define newton polygons using a Stream' of `Step`'s which correspond to what you would obtain via the 'algorithm' of rotating half-planes as described in Gouvea's p-adic numbers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor	620/0	Mathlib.lean,Mathlib/NumberTheory/NewtonPolygon.lean	2	3	['github-actions', 'jcommelin']	nobody	33-26465 1 month ago	unknown	0-0 0 seconds
37474	Komyyy author:Komyyy	perf: no expose `SplittingField` and `GaloisField`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP merge-conflict label:t-algebra$	361/95	Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,MathlibTest/instance_diamonds/FieldTheory/SplittingField/Construction.lean	4	7	['Komyyy', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	33-3075 1 month ago	47-77005 47 days ago	0-240 4 minutes
37247	yuma-mizuno author:yuma-mizuno	feat(GroupTheory/MonoidLocalization): add prime transport lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	75/7	Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	3	6	['github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	32-69351 1 month ago	32-69351 32 days ago	20-41780 20 days
38113	robo7179 author:robo7179	feat(SimpleGraph/PerfectGraph): add lemma graph is perfect iff all su…	Perfect graph theorem , discussion on zulip thread: [#graph theory > Second Order Monadic Logic](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Second.20Order.20Monadic.20Logic.20for.20Graph/with/583013775) - [ ] depends on: #37680 - [ ] depends on: #37598	t-combinatorics new-contributor blocked-by-other-PR	54/0	Mathlib/Combinatorics/SimpleGraph/PerfectGraph.lean	1	3	['github-actions', 'mathlib-dependent-issues']	nobody	32-61184 1 month ago	32-62543 32 days ago	0-69 1 minute
37420	artie2000 author:artie2000	refactor: change definitions to avoid `ConvexCone`	Change the definitions of `PointedCone.positive` and `PointedCone.closure` to avoid mentioning `ConvexCone`. This PR is part of a series deprecating `ConvexCone`: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/with/582738985 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	10/4	Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	32-61115 1 month ago	32-61079 32 days ago	47-81635 47 days
38122	grunweg author:grunweg	fix: properly tag structures with the stacks tag	Currently, tagging a structure or class with the stacks or kerodon attribute [has no effect](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tagging.20a.20class.20with.20.40stacks.20attribute.20has.20no.20effect/with/585908804) To demonstrate the issue, we manually fix all stacks tags on structures. There are 37 further instances of @[stacks] on classes, and 6 misplaced Kerodon tags; these are left to a future PR. --- Arguably, the stacks attribute should be fixed instead. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	31/21	Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Point/Conservative.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/CategoryTheory/Triangulated/Triangulated.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/Topology/Spectral/Hom.lean	12	1	['github-actions']	nobody	32-52218 1 month ago	32-52246 32 days ago	0-50 50 seconds
37199	mckoen author:mckoen	feat(CategoryTheory/Monoidal/Arrow): pushout-products of monomorphisms are monic	Proves conditions under which the pushout-product of two monomorphisms is again a monomorphism. - [x] depends on: #33935 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory merge-conflict	580/0	Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Monoidal/Arrow.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	32-36165 1 month ago	53-83168 53 days ago	0-13 13 seconds
36774	euprunin author:euprunin	chore: replace long terminal `rw […]`:s (≥4 lemmas) with bare `simp`:s	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `Finset.lcm_union`: unchanged 🎉 * `Finset.gcd_union`: unchanged 🎉 * `Polynomial.derivative_eval₂_C`: unchanged 🎉 * `Polynomial.expand_pow`: unchanged 🎉 * `Cardinal.mk_real`: unchanged 🎉 * `Real.log_zpow`: unchanged 🎉 * `Matroid.eRank_le_encard_add_eRk_compl`: unchanged 🎉 * `DFinsupp.single_tsub`: unchanged 🎉 * `EReal.inv_neg`: unchanged 🎉 * `Finsupp.toMultiset_map`: unchanged 🎉 * `Finsupp.single_tsub`: unchanged 🎉 * `Multiset.countP_map`: unchanged 🎉 * `Nat.ascFactorial_eq_factorial_mul_choose'`: unchanged 🎉 * `Real.sign_intCast`: unchanged 🎉 * `Real.volume_eball`: unchanged 🎉 * `Real.volume_closedEBall`: unchanged 🎉 * `LFunction_ne_zero_of_not_quadratic_or_ne_one`: 295 ms before, 152 ms after 🎉 * `hasSum_one_div_nat_pow_mul_cos`: unchanged 🎉 * `inv_eq_of_aeval_divX_ne_zero`: unchanged 🎉 * `AlgebraicIndependent.aeval_comp_mvPolynomialOptionEquivPolynomialAdjoin`: unchanged 🎉 * `Ordinal.deriv_mul_eq_opow_omega0_mul`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		22/24	Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Real/Sign.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,Mathlib/NumberTheory/ZetaValues.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	19	2	['artie2000', 'euprunin', 'github-actions']	nobody	32-33386 1 month ago	62-41912 62 days ago	62-41905 62 days
37844	edegeltje author:edegeltje	feat(CategoryTheory): The (strict bi-)category of partial maps in a category	This PR adds a type alias for the (strict bi-)category of partial maps in some category. Given some category `C`, the category of partial maps in `C` has the objects of `C`. 1-morphisms from `X : C` to `Y : C` are partial maps, and 2-morphisms from `f : X ⇀ Y` to `g : X ⇀ Y` are given by extending the support. It adds API for creating 1-morphisms and 2-morphisms in this bicategory, as well as defines various relevant functors and presheaves --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	843/3	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/PartialMap/Defs.lean,Mathlib/CategoryTheory/PartialMap/PrePartialMap.lean	4	5	['dagurtomas', 'edegeltje', 'github-actions']	nobody	32-23869 1 month ago	39-24455 39 days ago	0-12805 3 hours
37938	SamuelSchlesinger author:SamuelSchlesinger	feat(Probability/Posterior): Posterior PMFs and Various Lemmas	Upstreaming the probability lemmas needed in https://github.com/leanprover/cslib/pull/464.	t-measure-probability new-contributor awaiting-author	130/0	Mathlib.lean,Mathlib/Probability/ProbabilityMassFunction/Posterior.lean	2	6	['EtienneC30', 'SamuelSchlesinger', 'github-actions']	RemyDegenne assignee:RemyDegenne	32-22527 1 month ago	33-55968 33 days ago	0-4092 1 hour
38141	Jun2M author:Jun2M	feat(Order/Partition): Partition induced by symmetric, transitive relation	We introduce a constructor for Partition from a symmetric, transitive relation, with `copy` function baked into the definition. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	41/7	Mathlib/Order/Partition/Basic.lean	1	1	['github-actions']	nobody	32-10495 1 month ago	32-10562 32 days ago	32-10555 32 days
37907	grunweg author:grunweg	feat(by_contra,contrapose): warn if the push_neg step does nothing	--- - [x] depends on: #31597 - [x] depends on: #37899 - [x] depends on: #37937 - [x] depends on: #37999 - [x] depends on: #38008 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta	42/6	Mathlib/NumberTheory/ArithmeticFunction/LFunction.lean,Mathlib/Tactic/ByContra.lean,Mathlib/Tactic/Contrapose.lean,MathlibTest/Contrapose.lean,MathlibTest/byContra.lean	5	4	['github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-74863 1 month ago	38-25705 38 days ago	0-2 2 seconds
38139	sidbedi author:sidbedi	chore(Algebra/MvPolynomial/Variables): golf MvPolynomial.vars_0 to rfl	--- The classical qualifier and explicit rewrite chain are unnecessary — the result holds definitionally. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	1/2	Mathlib/Algebra/MvPolynomial/Variables.lean	1	3	['github-actions', 'grunweg']	nobody	31-66987 1 month ago	31-66987 31 days ago	0-34567 9 hours
38140	sidbedi author:sidbedi	chore(Data/Analysis/Filter): golf CFilter.ofEquiv_val to rfl	--- cases F is unnecessary, the result holds definitionally. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	1/2	Mathlib/Data/Analysis/Filter.lean	1	3	['github-actions', 'grunweg']	nobody	31-66943 1 month ago	31-66943 31 days ago	0-34488 9 hours
36731	michael-novak-math author:michael-novak-math	feat: Frénet moving frame and Frénet equation for plane curves	We define the curvature function, normal vector function and the Frénet moving frame for plane curve. We also prove the Frénet equations for plane curves. A separate PR (#37489) will prove the fundamental theorem of plane curves.	new-contributor t-differential-geometry t-analysis awaiting-author	321/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/PlaneCurves.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	114	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'michael-novak-math', 'scholzhannah']	nobody	31-60924 1 month ago	44-38547 44 days ago	12-40134 12 days
37929	Vierkantor author:Vierkantor	chore(Tactic): rewrite `reduce_mod_char` tactic docstring	This PR rewrites the docstrings for the `reduce_mod_char` tactic, to consistently match the official style guide, to make sure they are complete while not getting too long. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation t-meta awaiting-author	22/12	Mathlib/Tactic/ReduceModChar.lean	1	4	['JovanGerb', 'github-actions']	JovanGerb assignee:JovanGerb	31-59779 1 month ago	31-59779 31 days ago	3-77447 3 days
38158	ADedecker author:ADedecker	Illustration of a weird behaviour	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	23/0	Mathlib/Topology/Algebra/Module/Spaces/CompactConvergenceCLM.lean	1	1	['github-actions']	nobody	31-55499 1 month ago	unknown	0-0 0 seconds
38130	edegeltje author:edegeltje	feat(CategoryTheory): Add the category of partial map diagrams	This PR was split from #37844 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	324/0	Mathlib.lean,Mathlib/CategoryTheory/PartialMap/PrePartialMap.lean	2	13	['chrisflav', 'dagurtomas', 'edegeltje', 'github-actions', 'joelriou', 'robin-carlier']	nobody	31-48443 1 month ago	31-48443 31 days ago	0-68688 19 hours
37480	erdOne author:erdOne	feat(AlgebraicTopology): homology of contractible spaces	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology awaiting-author merge-conflict	62/4	Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvarianceTopCat.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean	2	25	['FernandoChu', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'vlad902']	dagurtomas assignee:dagurtomas	31-45827 1 month ago	39-40184 39 days ago	7-33084 7 days
37683	SabrinaJewson author:SabrinaJewson	feat(Order/OrdContinuous): every map between complete lattices that preserves sSup is a left adjoint of some Galois connection	It is already proven that the left side of a Galois connection is left-continuous; this provides the converse. --- - [ ] depends on: #37682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-order	90/136	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Tactic/Translate/ToDual.lean,Mathlib/Topology/Order/Basic.lean	6	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41551 1 month ago	43-10443 43 days ago	0-1447 24 minutes
37684	SabrinaJewson author:SabrinaJewson	feat(Topology/Order): provide lemmas linking topological continuity to order continuity	All the hard work is already done, but this just fills in a couple convenient missing pieces. --- - [ ] depends on: #37682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR merge-conflict t-topology	106/136	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Tactic/Translate/ToDual.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/IsLUB.lean,Mathlib/Topology/Order/Monotone.lean	8	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41540 1 month ago	43-10444 43 days ago	0-1299 21 minutes
36843	xroblot author:xroblot	feat(NumberTheory/RamificationInertia/HilbertTheory): compositum of unramified extensions is unramified	Add two theorems about the behaviour of ramification in composite extensions: - `Ideal.ramificationIdx_sup_eq_one`: if a prime `p` is unramified in both `F₁/K` and `F₂/K`, then it is unramified in `(F₁ ⊔ F₂)/K`. - `Ideal.ramificationIdx_inertiaDeg_sup_eq_one`: if `p` totally splits in both `F₁/K` and `F₂/K`, then it totally splits in `(F₁ ⊔ F₂)/K`. These are obtained by reducing to the Galois case (proved in the same file). --- - [ ] depends on: #36772 - [ ] depends on: #35991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR merge-conflict t-number-theory t-algebra label:t-algebra$	1327/32	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IntermediateField/ExtendTop.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Ideal/Galois.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	17	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41518 1 month ago	60-72177 60 days ago	0-1289 21 minutes
37376	NoneMore author:NoneMore	feat(Topology/CantorBendixson): add iterated derived sets and perfect kernel	Define the transfinite iteration of the relative derived-set operator via `gfpApprox` and introduce the perfect kernel of a set. --- AI disclosure: Most declarations, comments, and documentation in this PR were generated with Codex. Some proofs were structurally simplified using the `/golf` command from Lean 4 Skills. I reviewed the resulting code and documentation and can vouch for all submitted content. - [ ] depends on: #37374 - [x] depends on: #37375 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR t-topology	249/0	Mathlib.lean,Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean,Mathlib/Topology/CantorBendixson.lean,Mathlib/Topology/DerivedSet.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41509 1 month ago	49-49241 49 days ago	0-832 13 minutes
37365	lecopivo author:lecopivo	feat(Tactic/FunProp): theorem priority	Add support for theorem priority for `fun_prop` --- Computing derivatives revealed that `fun_prop` really needs priority support for it theorems as `HasDerivAt.fun_pow'` should definitely have lower priority over `HasDerivAt.fun_pow`. - [ ] depends on: #37270 --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR merge-conflict t-meta	1740/258	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean,Mathlib/Analysis/Calculus/FDeriv/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/SpecialFunctions/Arcosh.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogDeriv.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ArctanDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ComplexDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/DerivHyp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/Simproc.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Measurability.lean,MathlibTest/fun_prop2.lean,MathlibTest/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	46	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-41500 1 month ago	49-63648 49 days ago	0-629 10 minutes
37904	maddycrim author:maddycrim	feat(LinearAlgebra/PiTensorProduct/PiEquiv): Tensor Product and Direct Product Commute for Finitely Presented Modules	From FLT Project. Main definitions: * `tensorPi_equiv_piTensor'` : `M ⊗[R] (Π i, N i) ≃ₗ[R] Π i, (M ⊗[R] N i)` for finite free modules * `tensorPi_equiv_piTensor` : the same but for finitely-presented modules. Depends on #38170 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	244/0	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/LinearAlgebra/PiTensorProduct/PiEquiv.lean	4	5	['github-actions', 'maddycrim', 'themathqueen']	nobody	31-39290 1 month ago	31-43342 31 days ago	0-3725 1 hour
38185	Jun2M author:Jun2M	feat(Order/Partition): operations over Frame	This PR introduces: * `Partition.induce`: The induce of a partition by a frame element. * `Partition.disjUnion`: The disjoint union of two partitions. * `Partition.bind`: The finer partition obtained by family of partitions for each part of the original partition. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	89/11	Mathlib/Order/Partition/Basic.lean,Mathlib/Order/SupIndep.lean	2	1	['github-actions']	nobody	31-27881 1 month ago	31-27953 31 days ago	31-27946 31 days
38154	ybenmeur author:ybenmeur	add subsingleton case to ExpChar	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	113/49	Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/PurelyInseparable/Exponent.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/SeparableDegree.lean,Mathlib/RingTheory/Trace/Basic.lean	15	2	['github-actions']	nobody	30-49309 1 month ago	unknown	0-0 0 seconds
37530	mcdoll author:mcdoll	fix(Topology/Algebra): fix bad simps and make arguments implicit for `PointwiseConvergenceCLM`	We delete all `simps` calls in the definitions of operators on `PointwiseConvergenceCLM` and replace them with `apply_apply` lemmas that do not abuse the defeq between `SLₚₜ` and `SL`. This made the linter discover some typeclass duplications, which we remove by restructuring the file. As a consequence of the new `simp` lemmas, we can remove all `set_option backward.isDefEq.respectTransparency false in` in `Analysis.Distribution.TemperedDistribution`. Moreover, we make several arguments implicit, which can be inferred in almost all practical situations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	not-ready-to-merge merge-conflict	88/69	Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Topology/Algebra/Module/Spaces/PointwiseConvergenceCLM.lean	2	5	['github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mcdoll']	nobody	29-79337 29 days ago	29-79338 29 days ago	14-59669 14 days
37593	IlPreteRosso author:IlPreteRosso	refactor(Data.Finset.Antidiagonal): rename set-based defs to `setAntidiagonal`	Renames set-based `Finset.mulAntidiagonal` → `setMulAntidiagonal` (and SMul/VAdd variants) to free the `mulAntidiagonal` name for the planned `HasMulAntidiagonal` typeclass. Deprecation aliases added. Supersedes #34551	t-ring-theory new-contributor merge-conflict	178/96	Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	3	['github-actions', 'mathlib-merge-conflicts']	nobody	29-79336 29 days ago	29-79337 29 days ago	15-61521 15 days
37528	kim-em author:kim-em	feat: @[simps] warns when generating defeq abusing lemmas		t-meta	202/16	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/DirectSum/AddChar.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Action/Basic.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/Weights/Linear.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/Cokernel.lean,Mathlib/Algebra/Module/Presentation/DirectSum.lean,Mathlib/Algebra/Module/Presentation/Tautological.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/Module/Submodule/RestrictScalars.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Subring/MulOpposite.lean,Mathlib/Algebra/TrivSqZeroExt/Basic.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Combinatorics/Quiver/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Data/Bundle.lean,Mathlib/Data/Matrix/DualNumber.lean,Mathlib/Data/Multiset/Fintype.lean,Mathlib/Data/Real/ENatENNReal.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Fin/Basic.lean,Mathlib/Logic/Function/FromTypes.lean,Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/ModelTheory/LanguageMap.lean,Mathlib/Order/CompleteSublattice.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/BoundedLattice.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Sublattice.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Basic.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IsAdjoinRoot.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Topology/Algebra/Module/Spaces/CompactConvergenceCLM.lean,Mathlib/Topology/Algebra/Module/Spaces/PointwiseConvergenceCLM.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean,Mathlib/Topology/FiberBundle/Constructions.lean,MathlibTest/Simps.lean	75	2	['github-actions', 'mathlib-merge-conflicts']	nobody	29-77039 29 days ago	unknown	0-0 0 seconds
38245	RemyDegenne author:RemyDegenne	feat: CountableSupClosed	Define the property for a set of being closed by countable supremum (resp. infimum). The new file is adapted from the `SupClosed` file, which describes sets closed by binary supremum. Also use `to_dual` on `SupClosed`. `CountableInfClosed` will be used in measure theory, for developments related to compact systems used for Kolmogorov's extension theorem and Choquet's capacitability theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order brownian	308/66	Mathlib.lean,Mathlib/Order/CountableSupClosed.lean,Mathlib/Order/SupClosed.lean	3	14	['RemyDegenne', 'b-mehta', 'github-actions', 'vihdzp']	nobody	29-45667 29 days ago	29-59917 29 days ago	29-64634 29 days
37889	LLaurance author:LLaurance	chore(Algebra): shorten proof by using tactic mode instead of calc mode	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	4/13	Mathlib/Algebra/Star/Center.lean	1	16	['JovanGerb', 'LLaurance', 'faenuccio', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors', 'themathqueen']	nobody	29-40854 29 days ago	37-45436 37 days ago	1-5229 1 day
32282	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): unoriented angle bisection	Add lemmas giving unoriented angles involving the incenter and excenters of a triangle as expressions involving dividing angles of the triangle by 2, deduced from oriented bisection lemmas. --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #31205 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32259 - [ ] depends on: #32260 - [ ] depends on: #32270 - [ ] depends on: #32273 - [ ] depends on: #32278 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	98/0	Mathlib/Geometry/Euclidean/Angle/Incenter.lean	1	8	['github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'wwylele']	nobody	29-13670 29 days ago	52-37622 52 days ago	52-38351 52 days
38270	Deicyde author:Deicyde	feat(Geometry/Manifold): The Tangent Functor on `MfldCat`	A simple motivating example for PR #38223. We define the `tangentFunctor : MfldCat 𝕜 (n + 1) ⥤ MfldCat 𝕜 n` which takes any manifold to its tangent bundle and any smooth map to its pushforward. This is a standard construction in differential geometry. See: J. Lee, Smooth Manifolds, pg. 75 --- - [ ] depends on: #38223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR new-contributor	320/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/Category/MfldCat/TangentFunctor.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	29-5992 29 days ago	unknown	0-0 0 seconds
38053	ntapiam author:ntapiam	feat(Analysis/Controls): add Control functions	Add Control functions ---- This PR adds Control functions in the sense of rough paths theory (see e.g. [Friz-Victoir, Section 1.2.1](https://page.math.tu-berlin.de/~friz/master4_May6th.pdf)). They are related to p-variation norms which are the goal of #38055. I've shown most results in the above reference though those relating to 1-variation are still a work in progress. I had to add a few statements about convex functions in order to work over NNReal instead or Real, but I am not sure this is the best way to do it. The reason is that I've defined controls as taking values in NNReal (as they should). In particular there is ```lean4 theorem nnreal_of_real {f : ℝ≥0 → ℝ≥0} (hf : ConvexOn ℝ (Set.Ici 0) fun x : ℝ => (f x.toNNReal : ℝ)) : ConvexOn ℝ≥0 ⊤ f ``` which I didn't know where to put. It probably holds in more generality but I didn't check. I have also included two versions of Controls, one global and one restricted to a set. I tried to follow Mathlib conventions as best as I could but perhaps that could be improved as well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis new-contributor	571/1	Mathlib.lean,Mathlib/Analysis/Controls/BoundedVariation.lean,Mathlib/Analysis/Controls/ControlOn.lean,Mathlib/Analysis/Controls/Defs.lean,Mathlib/Analysis/Convex/Function.lean,docs/references.bib	6	4	['github-actions', 'ntapiam']	nobody	28-61440 28 days ago	34-26623 34 days ago	0-52 52 seconds
33108	alreadydone author:alreadydone	feat(Topology): `π₁(E⧸G)⧸π₁(E) ≃* G` for `E` path connected	TODO: + finish last step (currently only `π₁(E⧸G) →* G` has been constructed) + characterization of the homomorphism + change of basepoint `e : E` leads to conjugation by `G` + if `G` is abelian then independent of choice of basepoint (and we can remove the ᵐᵒᵖ) + $\pi_1(S^1)\cong\mathbb{Z}$ + define winding number --- - [x] depends on: #7596 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP t-topology merge-conflict	232/36	Mathlib/Algebra/Regular/SMul.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/Topology/Covering/Quotient.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Path.lean	6	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	28-27572 28 days ago	150-27199 150 days ago	0-1 1 second
37432	mariainesdff author:mariainesdff	feat(Algebra/BigOperators/NatAntidiagonal): add ofAdd_antidiagonal	Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	27/0	Mathlib/Algebra/BigOperators/NatAntidiagonal.lean	1	2	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	27-72805 27 days ago	39-34163 39 days ago	9-25258 9 days
37444	vihdzp author:vihdzp	feat: typeclass for zero-dimensional spaces	--- - [ ] depends on: #37317 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import merge-conflict	151/110	Mathlib/Topology/Algebra/ClopenNhdofOne.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,Mathlib/Topology/Category/Profinite/Basic.lean,Mathlib/Topology/Category/Profinite/CofilteredLimit.lean,Mathlib/Topology/Category/Stonean/Basic.lean,Mathlib/Topology/ClopenBox.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/WithTop.lean,Mathlib/Topology/Separation/CompletelyRegular.lean,Mathlib/Topology/Separation/DisjointCover.lean,Mathlib/Topology/Separation/Lemmas.lean,Mathlib/Topology/Separation/Profinite.lean,Mathlib/Topology/UniformSpace/Ultra/Basic.lean	13	17	['ADedecker', 'FernandoChu', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	27-58620 27 days ago	27-59692 27 days ago	0-5306 1 hour
38036	JovanGerb author:JovanGerb	feat: `NSMul`/`NPow` type class	This PR is adds `NSMul`, `NPow`, `ZSMul` and `ZPow` classes for the `nsmul`, `npow`, `zsmul`, `zpow` data fields. This has a few advantages: - If you first declare a `SMul` instance, then you don't need to manually write `nsmul := (· • ·)` and `zsmul := (· • ·)` . For `Pow`, the extra benefit is that inferring the instance is preferred over the default field `npowRecAuto`. So this helps avoid accidental diamonds. - If you first declare a `SMul` instance on a type synonym, then `inferInstanceAs` will infer the `nsmul` field from the `SMul` instance. This makes it easier to avoid diamonds on type synonyms like `Matrix` and `MonoidAlgebra`. - The not-yet-merged instance diamond linter will be able to detect cases where the `NSMul` and `SMul` classes do not agree. In the process of making this PR, I have identified two existing `NPow` diamonds: - In `Mathlib.Algebra.Order.Positive.Field`, there were two conflicting `NPow` instances. - For `Fin`, there are two conflicting `NPow` instances. I have overwritten the one in core lean with the one from mathlib that is more computationally efficient. TODO: the same for `QSMul` and `NNQSMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		276/273	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Action/Opposite.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Opposite.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean,Mathlib/LinearAlgebra/Matrix/ZPow.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,MathlibTest/instance_diamonds.lean	41	16	['JovanGerb', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-radar', 'vihdzp']	nobody	27-53273 27 days ago	27-54165 27 days ago	27-54448 27 days
37479	ADedecker author:ADedecker	feat(Distribution): make parameters implicit in favor of type ascription	Expanding on a suggestion by @faenuccio in an earlier PR, I make the regularity parameters of [TestFunction.fderivCLM](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Distribution/TestFunction.html#TestFunction.fderivCLM) (and similar constructions) implicit. This is a bit controversial, because it is essentially forcing type ascription in a lot of contexts. The rationale is that "the differentiation operator from `𝓓^{n}` to `𝓓^{k}`" matches mathematical practice, and is easier to parse than "the differentiation operator with parameters `n` and `k`". To make this even more convenient, I introduce notations like `𝓓^{n}` to be used when the spaces can be inferred but the regularity cannot. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	107/46	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean	2	4	['faenuccio', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts']	sgouezel assignee:sgouezel	27-50817 27 days ago	41-23054 41 days ago	6-48011 6 days
37002	fbarroero author:fbarroero	WIP	WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory WIP	109/0	Mathlib/RingTheory/Localization/Integral.lean	1	2	['github-actions']	nobody	27-42273 27 days ago	57-29372 57 days ago	0-881 14 minutes
38339	xroblot author:xroblot	feat(NumberTheory/DirichletCharacter): add conductor_changeLevel and subgroups of characters mapping to one	This PR main additions are: - `conductor_changeLevel`: the conductor is invariant under `changeLevel` (lifting to a multiple level does not change the conductor). - `primitiveCharacter_changeLevel_apply`: the primitive character of `changeLevel hm χ` equals that of `χ`. - `subgroupOfMapToOne`: the subgroup of characters of level `n` sending a fixed integer `a` (coprime to `n`) to `1`. - `subgroupOfPrimitiveMapToOne`: the subgroup of characters of level `n` whose primitive character sends a prime `p` to `1`. --- - [ ] depends on: #38340 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	118/7	Mathlib/Data/ZMod/Coprime.lean,Mathlib/Data/ZMod/Units.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/MulChar/Basic.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	27-31233 27 days ago	27-31234 27 days ago	0-5165 1 hour
38337	Jun2M author:Jun2M	feat(Combinatorics/Graph): supremum	This PR introduces the union of `Graph`, as `sup`. Due to compatibility issue, in general, `sup` is not very well-behaved: `SemilatticeSup` is not true. In the case of incompatible edge, unlike `inf` which simply removed such edge, we include it following its incidence in the left graph. This has the benefit of associativity being true in general at the cost of commutativity. Assuming compatibility or existence of mutual supergraph, which are shown to be equivalent in this PR, everything behaves nicely. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	86/1	Mathlib/Combinatorics/Graph/Lattice.lean	1	2	['github-actions', 'vihdzp']	nobody	27-26021 27 days ago	27-50794 27 days ago	27-50787 27 days
37659	erdOne author:erdOne	feat(AlgebraicTopology): relative singular homology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	205/2	Mathlib.lean,Mathlib/Algebra/Homology/ShortComplex/ShortExact.lean,Mathlib/AlgebraicTopology/SingularHomology/Basic.lean,Mathlib/AlgebraicTopology/SingularHomology/Relative.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean	5	9	['erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	27-22532 27 days ago	38-45285 38 days ago	5-21324 5 days
38239	vihdzp author:vihdzp	chore(Order/SuccPred/Limit): reorganize sections	In an effort to keep the file better organized, we move theorems which use `SuccOrder`/`PredOrder` as an assumption to a new section. No theorems have been changed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	95/110	Mathlib/Order/SuccPred/Limit.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	27-22514 27 days ago	27-22515 27 days ago	2-48556 2 days
38321	ldct author:ldct	Tag absolute value lemmas with @[push]	## Summary - Tag `abs_mul`, `abs_pow`, `abs_mul_self`, `abs_inv`, `abs_div`, `abs_zpow`, and `abs_neg` with `@[push]` so that `push abs` can distribute absolute value through arithmetic expressions. - Add tests in `MathlibTest/push.lean` including a compound example: `\|a ^ n * b⁻¹ / (-a)\| = \|a\| ^ n * \|b\|⁻¹ / \|a\|` ## Test plan - [x] `lake env lean MathlibTest/push.lean` passes - [ ] CI 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-algebra merge-conflict label:t-algebra$	44/7	Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/Ring/Abs.lean,MathlibTest/push.lean	5	2	['github-actions', 'mathlib-merge-conflicts']	nobody	27-22512 27 days ago	unknown	0-0 0 seconds
37964	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Floor): weaken assumptions on theorems about `FloorRing`	This PR weakens as much assumptions as possible on theorems about `FloorSemiring` and `FloorRing`. Mainly, `IsOrderedRing` and `IsStrictOrderedRing` are weakened to just `IsOrderedAddMonoid` or removed completely from the assumptions on the theorems. Most theorems can be generalized as is or only requires a minor modification of replacing lemmas about casting naturals/integers preserving order (the likes of `Nat.cast_le`, `Int.cast_lt`, etc.) with the corresponding version for `FloorRing`. Some other lemmas require modification in the proofs, but these changes shorten the proofs. The new proof of the theorem `Int.mul_cast_floor_div_cancel_of_pos` requires an extra import. The assumption `IsOrderedAddMonoid` is required on lemmas that involve comparison + addition, and `IsOrderedRing` is required only on lemmas that involve comparison + multiplication of two non-integer elements. --- - [ ] depends on: #37714 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	349/266	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Topology/Algebra/Order/Floor.lean	9	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	27-15991 27 days ago	36-17359 36 days ago	0-3854 1 hour
38356	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Finset): `sSup s ≠ ⊤` in a `CompleteLinearOrder` for a finite set without `⊤`	--- btw `to_dual` here is blocked on #35213 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	20/0	Mathlib/Order/ConditionallyCompleteLattice/Finset.lean	1	1	['github-actions']	nobody	27-10739 27 days ago	27-10814 27 days ago	27-10807 27 days
38195	thorimur author:thorimur	test: insert `@[informal]` attributes from overview	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import merge-conflict	1961/353	Mathlib.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Calculus/BumpFunction/Convolution.lean,Mathlib/Analysis/Calculus/ContDiff/Convolution.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/FDeriv.lean,Mathlib/Analysis/Calculus/LocalExtr/Basic.lean,Mathlib/Analysis/Calculus/LocalExtr/Rolle.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,Mathlib/Analysis/Convex/Caratheodory.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/Inversion.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/LaxMilgram.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/Reflection.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/DoubleDual.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BanachSteinhaus.lean,Mathlib/Analysis/Normed/Operator/ContinuousLinearMap.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean	434	2	['github-actions', 'mathlib-merge-conflicts']	nobody	26-55776 26 days ago	unknown	0-0 0 seconds
38190	AntoineChambert-Loir author:AntoineChambert-Loir	refactor(Topology/Sion): use a dense and continuous completion to generalize the statements	Use the existence of a dense and continuous completion to simplify the final part of the proof of Sion's theorem. As a matter of fact, only an early lemma needs to be modified and the rest holds in weaker assumptions, leading to a serious simplification. Since the PR proving Sion is very recent and unused, we didn't add deprecation lemmas. --- - [ ] depends on: #37939 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	249/119	Mathlib.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Order/Completion.lean,Mathlib/Topology/Order/Completion.lean,Mathlib/Topology/Sion.lean	5	8	['AntoineChambert-Loir', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	26-46446 26 days ago	31-20670 31 days ago	0-39 39 seconds
37279	imalinowskip author:imalinowskip	feat(Probability): multivariate CLT (and Cramèr-Wold)	--- - [x] depends on: #36208 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author large-import	500/1	Mathlib.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/CramerWold.lean	3	10	['EtienneC30', 'github-actions', 'imalinowskip', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	RemyDegenne assignee:RemyDegenne	26-30984 26 days ago	39-56070 39 days ago	5-65208 5 days
37939	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Order/Completion): embed a linear order into a dense and complete linear order	The aim of the PR is to prove the following theorem that will be used as an input to [Sion.DMCompletion.exists_isSaddlePointOn](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sion.html#Sion.DMCompletion.exists_isSaddlePointOn) : If `β` is any linear order, then there exists a complete and dense linear order `γ` together with a continuous embedding `ι : β ↪o γ` (for the order topologies on `β` and `γ`). Meanwhile, the PR also records various instances about dense orders and lemmas regarding the Dedekind MacNeille completion and lexicographic orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	206/3	Mathlib.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Order/Completion.lean,Mathlib/Topology/Order/Completion.lean,Mathlib/Topology/Sion.lean	5	52	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	vihdzp assignee:vihdzp	26-25791 26 days ago	26-46522 26 days ago	29-46214 29 days
38325	Jun2M author:Jun2M	feat(Combinatorics/Graph): EndPoint function	This PR introduces `endPoints`: `Set` of incident vertices, given an edge (in the case of non-edge, return empty). Import change: `Graph/Basic` now imports `Data/Set/Card` to allow reasoning about card of `endPoints`. [Relavent Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/513188-CSLib/topic/New.20graph.20definitions/with/588616269) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics large-import	83/3	Mathlib/Combinatorics/Graph/Basic.lean	1	9	['Jun2M', 'SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	26-17737 26 days ago	26-26567 26 days ago	27-82903 27 days
38266	staroperator author:staroperator	feat(Order/CompleteLatticeIntervals): `ConditionallyCompleteLinearOrderBot` for `Set.Iio`	`Set.Iio a` (when it's nonempty) inherits the `ConditionallyCompleteLinearOrderBot` structure from the base type. This is commonly used in set theory, where we consider the ordinals within `a`, and convert `Iio a` from/to `Ordinal`. There should also be a `ConditionallyCompleteLinearOrder` instance, but adding this seems difficult for now because the junk value may not be the same as bottom (which has been mentioned as "refactor that will allow different default values for `sSup` and `sInf`" in the module doc). Since my motivation is for the ordinals purely, this PR only adds a single `ConditionallyCompleteLinearOrderBot` instance. --- I'm not very familiar with the API design here, so any suggestion would be helpful. - [ ] depends on: #35674 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	76/0	Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/LatticeIntervals.lean	3	7	['github-actions', 'mathlib-dependent-issues', 'staroperator', 'vihdzp']	nobody	26-10402 26 days ago	26-10403 26 days ago	3-4203 3 days
38397	staroperator author:staroperator	feat(ModelTheory): add `DefinablePred` for `fun_prop` automation	This PR adds `DefinablePred`. It is the same as `Definable`, except the latter applies on `Set (α → M)` and the former applies on `(α → M) → Prop`. There main reason to add this is that I want to automate the definability proof of predicates, and that `fun_prop` works on functions (that include predicates) but not on sets. For example, with appropriate `fun_prop` lemmas added, one can automate definability result like this: ```lean4 theorem IsLinearSet.definable [Finite α] (hs : IsLinearSet s) : A.Definable presburger s := by ... -- ⊢ A.DefinablePred presburger fun x ↦ -- ∃ y, (∃ a, ∀ (x : α), y x = ∑ x_1, a x_1 * ↑x_1 x) ∧ ∀ (x_1 : α), v x_1 + y x_1 = x x_1 fun_prop ``` This PR also removes certain `fun_prop` tags that would or should not be used in automation. --- Note: one may argue that we don't need a new definition if we use `aesop` instead of `fun_prop`. However, in that case, we still need to write lemmas for `{x \| p x}` targets (e.g. for `{x \| p x ∧ q x}`), which have almost no difference with lemmas on `p` or `fun x => p x ∧ q x` directly. - [ ] depends on: #38393 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	500/261	Mathlib/ModelTheory/Algebra/Classes.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Definability.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Order.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	26-6288 26 days ago	26-7652 26 days ago	0-403 6 minutes
38393	staroperator author:staroperator	refactor(ModelTheory): add typeclasses for algebraic symbols	`Language.ring` and `Language.presburger` share the same symbols `0`, `1` and `+` and have duplicated instances on `Term` and `realize` simp lemmas. This PR makes these symbols certain typeclasses (similar to [`Language.IsOrdered`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/ModelTheory/Order.html#FirstOrder.Language.IsOrdered)) and removes the duplication. It also adds certain definability lemmas that `fun_prop` can use. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	332/201	Mathlib.lean,Mathlib/ModelTheory/Algebra/Classes.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Definability.lean	7	1	['github-actions']	nobody	26-5431 26 days ago	26-5489 26 days ago	26-7034 26 days
38399	openendings author:openendings	feat: OrderHom.instOrderSupSet for LawfulSup	Currently we have `instance [CompleteLattice β] : SupSet (α →o β)`. We replace this with a mere `LawfulSup` assumption such as #38328, . TODO: - [ ] construct an `OrderSupSet` instance instead of `SupSet` --- WIP - [ ] depends on: #38328 [or other `LawfulSup`] (based on master in case something else needs this) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-order new-contributor blocked-by-other-PR	26/0	Mathlib/Order/Hom/Order.lean	1	5	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'openendings']	nobody	25-81292 25 days ago	25-84136 25 days ago	0-106 1 minute
37502	felixpernegger author:felixpernegger	refactor(Topology): rename ```LocPathConnected```	Rename ```LocPathConnected``` to ```LocallyPathConnected``` per discussion at https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Rename.20.60.60.60LocPathConnectedSpace.60.60.60.3F/with/582824006 Deprecations were partly added with Claude --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	369/304	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/LocallyPathConnected.lean,Mathlib/Topology/Connected/PathComponentOne.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/LocallyContractible.lean	12	9	['SnirBroshi', 'felixpernegger', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	25-63428 25 days ago	46-65611 46 days ago	0-66443 18 hours
38388	supermanG author:supermanG	feat(Combinatorics/SimpleGraph): add ballFinset with basic identities	Introduces `SimpleGraph.ballFinset`, the `Finset` companion to `SimpleGraph.ball` (#36443) on graphs with a `Fintype` vertex set, together with the basic identities `mem_ballFinset`, `ballFinset_zero`, and `ballFinset_one`. `SimpleGraph.ball` is the open metric ball `{u \| edist u c < r}` and is indexed by `ℕ∞`; `ballFinset` is typed `ℕ → Finset V` for ergonomics at cardinality-facing call sites. The classical closed-ball cardinality at radius `r`, `\|{u \| edist u c ≤ r}\|`, corresponds to `\|ballFinset v (r + 1)\|` in this setup. Opened as draft so CI can run before pinging maintainers. --- First-time Mathlib contribution — happy to adjust naming, file placement, or docstring style to match house conventions. Follow-up PRs will add cardinality envelopes (sphere cardinality, geometric-series bound, polynomial bound).	t-combinatorics new-contributor LLM-generated	68/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BallCardinality.lean	2	3	['SnirBroshi', 'github-actions']	nobody	25-47342 25 days ago	unknown	0-0 0 seconds
37045	edegeltje author:edegeltje	feat(CategoryTheory/Limits): Pullback squares in cartesian monoidal categories	This PR adds various lemmas about standard pullback squares in categories with chosen finite products. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	351/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/IsPullback/CartesianMonoidal.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean	3	44	['FernandoChu', 'dagurtomas', 'edegeltje', 'github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	25-47339 25 days ago	25-47339 25 days ago	21-65314 21 days
26345	mans0954 author:mans0954	feat(Analysis/LocallyConvex/Polar): Bipolar theorem	The bipolar theorem states that the polar of the polar of a set `s` is equal to the closed absolutely convex hull of `s`. The argument here follows Conway, Chapter V. 1.8. This PR continues the work from #20843. Original PR: https://github.com/leanprover-community/mathlib4/pull/20843 - [x] depends on: #27316	t-analysis awaiting-author	171/6	Mathlib.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Topology/Algebra/Module/Spaces/WeakBilin.lean	6	136	['JonBannon', 'eric-wieser', 'faenuccio', 'github-actions', 'goliath-klein', 'j-loreaux', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll', 'themathqueen', 'vihdzp']	faenuccio and j-loreaux assignee:j-loreaux assignee:faenuccio	25-44440 25 days ago	29-57080 29 days ago	21-22015 21 days
38425	eric-wieser author:eric-wieser	fix: respect set_option in the unused tactic linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	35/31	Mathlib/Tactic/Linter/UnusedTactic.lean	1	1	['github-actions']	nobody	25-39666 25 days ago	unknown	0-0 0 seconds
37461	grunweg author:grunweg	chore: golf using the field tactic	--- In the spirit of #31314. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	32/43	Counterexamples/NowhereDifferentiable.lean,Mathlib/Analysis/Calculus/Monotone.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Integral/MeanValue.lean,Mathlib/NumberTheory/ModularForms/Discriminant.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/MDifferentiable.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/Distributions/Gaussian/CharFun.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/PowerSeries/Exp.lean,Mathlib/Topology/UnitInterval.lean	20	5	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	25-22218 25 days ago	25-22219 25 days ago	22-59925 22 days
38000	grunweg author:grunweg	feat: linters for recommended field_simp style, rebased	--- The current state fixes all sensible linter errors. TODOs prior to merging: - noisiness: right now, each `field` produces a try this suggestion (which doesn't work). warnings are useful; informational messages are superfluous - false positives 1: when `field` is applied to several goals (e.g., inside `<;>` and e.g. `ring` works for some, but not all occurrences), right now the linter still fires. It should not. - false positives 2: with `field` as a tactic discharger --- might be obsolete after the previous point. - [ ] depends on: #37461 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter blocked-by-other-PR awaiting-CI merge-conflict	156/65	Counterexamples/NowhereDifferentiable.lean,Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Side.lean,Mathlib/Analysis/Distribution/Sobolev.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean,Mathlib/Analysis/SpecialFunctions/OrdinaryHypergeometric.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/RootsExtrema.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/InformationTheory/KullbackLeibler/Basic.lean,Mathlib/Lean/Meta/WarningAsError.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean,Mathlib/MeasureTheory/Integral/MeanValue.lean,Mathlib/MeasureTheory/Measure/IntegralCharFun.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/Discriminant.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/MDifferentiable.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/Distributions/Gaussian/CharFun.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/Distributions/Poisson/PoissonLimitThm.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/PowerSeries/Exp.lean,Mathlib/Tactic/Field.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean	47	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	25-21246 25 days ago	35-54582 35 days ago	0-24 24 seconds
38434	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Maps): `map` lemmas about support/top/bot	--- - [ ] depends on: #38432 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	38/0	Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Logic/Relation.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	25-13882 25 days ago	25-15676 25 days ago	0-845 14 minutes
38422	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Maps): `G →g G.map f`	The existing `SimpleGraph.Embedding.map` takes an embedding and lifts it to a graph embedding `G ↪g G.map f`. #36130 generalized `SimpleGraph.map` from embeddings to functions, so now we can get a graph homomorphism `G →g G.map f` without requiring that `f` is injective, although we still have to require that it is injective on adjacent vertices (aka a valid coloring). This adds `Coloring.homMap`, and `Hom.map` which is identical but avoids coloring terminology/spelling. --- I'd love for suggestions to improve the docstring of `Coloring.homMap`, I'm not sure about it :) Are the two versions a good idea, or should we just have the coloring one? (we have `{Hom,Embedding,Iso}.comap` but only `{Embedding,Iso}.map`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	16/0	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	4	['SnirBroshi', 'eric-wieser', 'github-actions']	nobody	25-8028 25 days ago	25-43205 25 days ago	25-43255 25 days
37082	astrainfinita author:astrainfinita	chore(Order/CompleteLatticeIntervals): use different default values for `sSup` and `sInf`	In a subsequent PR, some assumptions will be added to `ordConnectedSubsetConditionallyCompleteLinearOrderOfBotTop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	34/25	Mathlib/Order/CompleteLatticeIntervals.lean	1	5	['YaelDillies', 'astrainfinita', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	24-70596 24 days ago	24-70596 24 days ago	4-44808 4 days
35417	joneugster author:joneugster	refactor(Cache): use module name for file hash instead of non-resolved file path	This PR continues the work from #21842. Original PR: https://github.com/leanprover-community/mathlib4/pull/21842 - [ ] depends on: #35415 - [ ] depends on: #35414 ---	CI t-meta blocked-by-other-PR merge-conflict	147/250	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	5	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	24-67980 24 days ago	91-42317 91 days ago	0-568 9 minutes
38384	Jun2M author:Jun2M	chore(Combinatorics/Graph): per def "expose" tag	`Combinatorics/Graph/Basic.lean` has a file-wide `expose` tag. This PR moves it to defs that requires them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	26/24	Mathlib/Combinatorics/Graph/Basic.lean,Mathlib/Combinatorics/Graph/Subgraph.lean,Mathlib/Topology/CWComplex/Classical/Graph.lean	3	4	['eric-wieser', 'github-actions', 'mathlib-bors']	nobody	24-58710 24 days ago	24-58712 24 days ago	1-52776 1 day
37794	EtienneC30 author:EtienneC30	feat: a sum of independent Bernoulli random variables is a binomial random variable	--- - [ ] depends on: #37736 - [ ] depends on: #37761 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability large-import blocked-by-other-PR merge-conflict	743/40	Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/Data/Set/Card.lean,Mathlib/MeasureTheory/Measure/AEMeasurable.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/Probability/Distributions/Bernoulli.lean,Mathlib/Probability/Distributions/Binomial.lean,Mathlib/Probability/Distributions/Poisson/PoissonLimitThm.lean,Mathlib/Probability/Distributions/SetBernoulli.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/HasLawExists.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/Probability/ProbabilityMassFunction/Binomial.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Integrals.lean	18	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	24-55654 24 days ago	unknown	0-0 0 seconds
36803	EtienneC30 author:EtienneC30	feat: pre-Brownian motion and independent increments	Prove that a pre-Brownian motion has independent increments, and that a process with independent increments and the right marginals is pre-Brownian. Use this to show that a (pre-)Brownian motion is stable by `neg`. --- - [x] depends on: #36745 - [ ] depends on: #36616 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability blocked-by-other-PR large-import	578/2	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/Probability/BrownianMotion/Basic.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/Covariance.lean	9	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	24-54873 24 days ago	41-65437 41 days ago	0-3049 50 minutes
37901	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Define algebraic cycles	In this PR we define the notion of algebraic cycles on a scheme, and define the pushforward of an algebraic cycle by a quasicompact morhphism. This was originally defined in #26304, but after some refactoring it was decided that it would be best to split this definition into a separate PR. - [ ] depends on: #26304 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebraic-geometry	250/0	Mathlib.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	24-50849 24 days ago	38-41486 38 days ago	0-365 6 minutes
37031	xroblot author:xroblot	feat(NumberField/CyclotomicField): inertia field of a cyclotomic field	Let `K = ℚ(ζₙ)` with `n = p ^ k * m` where `p` is prime and `¬ p ∣ m`. Then the subfield `F = ℚ(ζₘ)` is the inertia field of any prime `P` of `𝓞 K` lying over `p`. --- - [ ] depends on: #36733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict t-number-theory	581/21	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean	9	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	24-50839 24 days ago	56-64887 56 days ago	0-323 5 minutes
38408	b-mehta author:b-mehta	chore(Mathlib): shake mathlib harder	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	141294/11434	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Epi.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Shrink.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/Algebra/Subalgebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Rank.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Balance.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Field.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Gaps.lean,Mathlib/Algebra/BigOperators/Group/Finset/Indicator.lean,Mathlib/Algebra/BigOperators/Group/Finset/Interval.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Pi.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Powerset.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Algebra/BigOperators/Module.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/BigOperators/Ring/Nat.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/BigOperators/Sym.lean,Mathlib/Algebra/BigOperators/WithTop.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/AlgCat/Symmetric.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BialgCat/Monoidal.lean,Mathlib/Algebra/Category/BoolRing.lean	7930	3	['Kha', 'b-mehta', 'bryangingechen']	nobody	24-47419 24 days ago	unknown	0-0 0 seconds
36853	matthunz author:matthunz	feat(CategoryTheory/Monoidal/Braded/Traced): add `TracedCategory` class	Adds a `TracedCategory` class following [A. Joyal and R. Street and D. R. Verity, Traced monoidal categories](https://www.cambridge.org/core/journals/mathematical-proceedings-of-the-cambridge-philosophical-society/article/abs/traced-monoidal-categories/2BE85628D269D9FABAB41B6364E117C8#article): ```lean /-- A traced symmetric monoidal category. -/ class TracedCategory (C : Type u) [Category.{v} C] [MonoidalCategory.{v} C] [SymmetricCategory.{v} C] where /-- The trace operator. -/ trace : ∀ {A B : C} (W : C), (A ⊗ W ⟶ B ⊗ W) → (A ⟶ B) /-- Left tightening: sliding a morphism past the trace on the left. -/ trace_naturality_left : ∀ {A A' B : C} (W : C) (f : A' ⟶ A) (g : A ⊗ W ⟶ B ⊗ W), trace W (f ▷ W ≫ g) = f ≫ trace W g := by cat_disch /-- Right tightening: sliding a morphism past the trace on the right. -/ trace_naturality_right : ∀ {A B B' : C} (W : C) (f : A ⊗ W ⟶ B ⊗ W) (g : B ⟶ B'), trace W (f ≫ g ▷ W) = trace W f ≫ g := by cat_disch /-- Sliding: an endomorphism on the feedback wire slides past the trace. -/ trace_dinaturality : ∀ {A B W : C} (f : A ⊗ W ⟶ B ⊗ W) (h : W ⟶ W), trace W (f ≫ B ◁ h) = trace W (A ◁ h ≫ f) := by cat_disch /-- Superposing: trace commutes with left tensoring by a bystander object. -/ trace_superposing : ∀ {A B : C} (C' W : C) (f : A ⊗ W ⟶ B ⊗ W), C' ◁ trace W f = trace W ((α_ C' A W).hom ≫ C' ◁ f ≫ (α_ C' B W).inv) := by cat_disch /-- Vanishing I: trace over the tensor unit is the morphism itself (up to unitors). -/ trace_vanishing_one : ∀ {A B : C} (f : A ⊗ 𝟙_ C ⟶ B ⊗ 𝟙_ C), trace (𝟙_ C) f = (ρ_ A).inv ≫ f ≫ (ρ_ B).hom := by cat_disch /-- Vanishing II: trace over a tensor product equals iterated trace. -/ trace_vanishing_two : ∀ {A B X Y : C} (f : A ⊗ (X ⊗ Y) ⟶ B ⊗ (X ⊗ Y)), trace (X ⊗ Y) f = trace X (trace Y ((α_ A X Y).hom ≫ f ≫ (α_ B X Y).inv)) := by cat_disch /-- Yanking: the trace of the braiding is the identity. -/ trace_yanking : ∀ (W : C), trace W (β_ W W).hom = 𝟙 W := by cat_disch ``` ## Motivation `TracedCategory` can be used for denoting things like electric circuits, which require a traced symmetric monoidal category for the wire graph network. ## Future work - `instance [CompactClosedCategory C] : TracedCategory C` - possible notation such as `Tr_[W] f` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author merge-conflict	237/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Braided/Traced.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Traced.lean,docs/references.bib	4	5	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'matthunz']	nobody	24-41441 24 days ago	60-31004 60 days ago	0-25956 7 hours
38326	Jun2M author:Jun2M	feat(Combinatorics/Graph): Degree	This PR adds definition of `incFun`, a nat function counting how many times an edge is incident to a vertex (2 if it is loop), and `eDegree` & `degree`, enat and nat valued degree function as a tsum of `incFun`. Co-authored-by: Peter Nelson --- - [ ] depends on: #38325 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	194/22	Mathlib.lean,Mathlib/Combinatorics/Graph/Basic.lean,Mathlib/Combinatorics/Graph/Degree/Defs.lean,Mathlib/Combinatorics/Graph/Subgraph.lean,Mathlib/Topology/CWComplex/Classical/Graph.lean	5	6	['SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-dependent-issues']	nobody	24-34702 24 days ago	27-82803 27 days ago	0-1332 22 minutes
38478	dagurtomas author:dagurtomas	feat(Tactic/CategoryTheory): op attribute	Adding `@[op]` to a lemma named `H` of shape `∀ .., f = g`, where `f` and `g` are morphisms in some category `C`, creates a new lemma named `H_op` by applying `Quiver.Hom.op` to both sides and then simplifying with `simp only [op_comp, op_id]`. This PR also adds `op_of%`, and adjusts `@[map]` so that `@[op (attr := map)]` works for equalities of morphisms in opposite categories. --- - [ ] depends on: #37183 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated blocked-by-other-PR t-category-theory t-meta	491/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/Op.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	24-33152 24 days ago	24-44002 24 days ago	0-344 5 minutes
38424	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Coloring/VertexColoring): `chromaticNumber ⊤` and other small lemmas	- Golf `isEmpty_of_colorable_zero` and rename to `Colorable.isEmpty` - `colorable_one_iff`: `G.Colorable 1 ↔ G = ⊥` - Combine `chromaticNumber_eq_zero_of_isEmpty`/`isEmpty_of_chromaticNumber_eq_zero` into `chromaticNumber_eq_zero_iff : G.chromaticNumber = 0 ↔ IsEmpty V` and deprecate the `→` side - `chromaticNumber_top_eq_enat_card`: `chromaticNumber ⊤ = ENat.card V` - Tag `chromaticNumber_top_eq_top_of_infinite`/`chromaticNumber_eq_zero_of_isEmpty` as `simp` - Golf `chromaticNumber_eq_one_iff` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	33/26	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean	1	3	['SnirBroshi', 'github-actions', 'vlad902']	nobody	24-31214 24 days ago	25-39328 25 days ago	25-39759 25 days
37276	dagurtomas author:dagurtomas	chore(CategoryTheory): use the extended map attribute	--- - [ ] depends on: #37197 - [ ] depends on: #37275 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR merge-conflict	970/206	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/AlgebraicGeometry/Stalk.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Functor/Trifunctor.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackCone.lean,Mathlib/CategoryTheory/Localization/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/NatTrans.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean,Mathlib/CategoryTheory/Sites/Equivalence.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/MapOpposite.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapPreorder.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/MapSimpCheck.lean	46	2	['github-actions', 'mathlib-dependent-issues']	nobody	24-30644 24 days ago	52-45363 52 days ago	0-1 1 second
36824	j-loreaux author:j-loreaux	feat: generalize argument of `IsOrderedMonoid` from `CommMonoid` to `CommSemigroup`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	76/50	Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Opposite.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/Submonoid.lean,Mathlib/Algebra/Order/Monoid/TypeTags.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/Order/Filter/Germ/OrderedMonoid.lean,Mathlib/Topology/ContinuousMap/Lattice.lean	14	4	['github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	24-27303 24 days ago	61-35794 61 days ago	0-616 10 minutes
38498	SnirBroshi author:SnirBroshi	feat(Order/RelIso/Basic): lift a function to an order morphism into `Relation.Map` or from `Function.onFun`	For an `α`-relation `r` we have: ``` mapRelHom (f : α → β) : r →r Relation.Map r f f mapRelEmbedding (f : α ↪ β) : r ↪r Relation.Map r f f mapRelIso (f : α ≃ β) : r ≃r Relation.Map r f f ``` For a `β`-relation `r` we have: ``` onFunRelHom (f : α → β) : r.onFun f →r r onFunRelEmbedding (f : α ↪ β) : r.onFun f ↪r r onFunRelIso (f : α ≃ β) : r.onFun f ≃r r ``` --- These are pretty similar to `SimpleGraph.{Embedding/Iso}.map` and `SimpleGraph.{Hom/Embedding/Iso}.comap`, as [`comap`](https://github.com/leanprover-community/mathlib4/blob/9268b22206b0425419498769f780a91dee03bcf3/Mathlib/Combinatorics/SimpleGraph/Maps.lean#L117-L118) on graphs is a wrapper around `onFun`, and [`map`](https://github.com/leanprover-community/mathlib4/blob/9268b22206b0425419498769f780a91dee03bcf3/Mathlib/Combinatorics/SimpleGraph/Maps.lean#L57-L58) on graphs is almost a wrapper around `Relation.Map`. btw `@[simps]` is angry at me when I try to use it on the structures that use spread syntax. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	42/0	Mathlib/Order/RelIso/Basic.lean	1	1	['github-actions']	nobody	24-1381 24 days ago	24-1456 24 days ago	24-1449 24 days
38344	robo7179 author:robo7179	feat(SimpleGraph/Coloring/VertexColoring): Matching is 2 colorable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	51/0	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean	1	5	['SnirBroshi', 'github-actions', 'vlad902']	nobody	23-63704 23 days ago	27-31248 27 days ago	27-31627 27 days
37006	hakii6 author:hakii6	feat(LinearAlgebra/Matrix/Block, Analysis/Normed/Algebra/MatrixExponential): add BlockTriangular.pow and BlockTriangular.exp	# Summary Add BlockTriangular.pow and BlockTriangular.exp for proving "det (exp A) = exp (trace A)" # Which part using LLM The part I used LLM is for 1. Searching duplicated theorems and lemmas I may missed (I already search them myself first). 2. Help me handle the "variables and signatures", the "letI" part, some of lemmas and theorems trivial but hard to find the true one. 3. After I finished, let them helped me check the structure match the disciplines of mathlib. 4. Check the steps PR match the disciplines of mathlib Most things above are done by me first, then let them to make sure I'm not missing something. # More context More context can be found in a topic in "# new member" in Zulip [#new members > (Matrix and NormedSpace.exp) \| det (exp A) = exp (trace A)](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/.28Matrix.20and.20NormedSpace.2Eexp.29.20.7C.20det.20.28exp.20A.29.20.3D.20exp.20.28trace.20A.29/with/580964688)	new-contributor LLM-generated t-algebra awaiting-author label:t-algebra$	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	64	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'themathqueen', 'wwylele']	themathqueen assignee:themathqueen	23-58036 23 days ago	23-58036 23 days ago	33-42047 33 days
38222	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemmas about isomorphism and girth	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	19/1	Mathlib/Combinatorics/SimpleGraph/Girth.lean	1	6	['IvanRenison', 'SnirBroshi', 'github-actions', 'vlad902']	nobody	23-47326 23 days ago	30-22239 30 days ago	30-22232 30 days
38528	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Paths): some cycle lemmas are true for circuits	Add `IsCircuit.{not_of_nil,ne_bot,three_le_length}` by using their corresponding `IsCycle` proofs. Also golfs a bit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	17/9	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	23-46230 23 days ago	23-46300 23 days ago	23-46293 23 days
37959	artie2000 author:artie2000	feat(LinearAlgebra/Dimension/Free): lemmas about finrank	* Division variant of tower law * Isomorphic to base ring iff rank is one --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	34/9	Mathlib/LinearAlgebra/Dimension/Free.lean	1	7	['artie2000', 'github-actions', 'themathqueen']	themathqueen assignee:themathqueen	22-59131 22 days ago	23-15371 23 days ago	12-62496 12 days
38531	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Paths): `Walk.map` preserves more properties	Adds some missing theorems about how `Walk.map` behaves with `IsTrail`/`IsPath`/`IsCircuit`/`IsCycle`. Summary of what we have now, with the 8 new theorems and 2 renames marked: ``` IsTrail.of_map : (p.map f).IsTrail → p.IsTrail -- new map_isTrail_iff_of_injective : f.Injective → (p.map f).IsTrail ↔ p.IsTrail IsTrail.map : f.Injective → p.IsTrail → (p.map f).IsTrail -- renamed from map_isTrail_of_injective IsPath.of_map : (p.map f).IsPath → p.IsPath map_isPath_iff_of_injective : f.Injective → (p.map f).IsPath ↔ p.IsPath IsPath.map : f.Injective f → p.IsPath → (p.map f).IsPath -- renamed from map_isPath_of_injective IsCircuit.of_map : (p.map f).IsCircuit → p.IsCircuit -- new map_isCircuit_iff_of_injective : f.Injective → (p.map f).IsCircuit ↔ p.IsCircuit -- new IsCircuit.map : f.Injective → p.IsCircuit → (p.map f).IsCircuit -- new IsCycle.of_map : (p.map f).IsCycle → p.IsCycle -- new map_isCycle_iff_of_injective : f.Injective → (p.map f).IsCycle ↔ p.IsCycle IsCycle.map : f.Injective → p.IsCycle → (p.map f).IsCycle mapLe_isTrail : G ≤ G' → (p.mapLe h).IsTrail ↔ p.IsTrail IsTrail.of_mapLe : G ≤ G' → (p.mapLe h).IsTrail → p.IsTrail IsTrail.mapLe : G ≤ G' → p.IsTrail → (p.mapLe h).IsTrail mapLe_isPath : G ≤ G' → (p.mapLe h).IsPath ↔ p.IsPath IsPath.of_mapLe : G ≤ G' → (p.mapLe h).IsPath → p.IsPath IsPath.mapLe : G ≤ G' → p.IsPath → (p.mapLe h).IsPath mapLe_isCircuit : G ≤ G' → (p.mapLe h).IsCircuit ↔ p.IsCircuit -- new IsCircuit.of_mapLe : G ≤ G' → (p.mapLe h).IsCircuit → p.IsCircuit -- new IsCircuit.mapLe : G ≤ G' → p.IsCircuit → (p.mapLe h).IsCircuit -- new mapLe_isCycle : G ≤ G' → (p.mapLe h).IsCycle ↔ p.IsCycle IsCycle.of_mapLe : G ≤ G' → (p.mapLe h).IsCycle → p.IsCycle IsCycle.mapLe : G ≤ G' → p.IsCycle → (p.mapLe h).IsCycle ``` --- Also golfs `map_isPath_of_injective`/`IsPath.of_map`/`map_isTrail_iff_of_injective`, they don't need induction. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	47/31	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	22-54888 22 days ago	23-28968 23 days ago	23-28961 23 days
38549	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Copy): `Is(Ind)Contained` `completeGraph` lemmas	- `G ⊑ completeGraph V` - `G ⊑ completeGraph W ↔ Nonempty (V ↪ W)` - `completeGraph V ⊴ completeGraph W ↔ Nonempty (V ↪ W)` - `G ⊴ completeGraph W → G = ⊤` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	12/0	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	1	['github-actions']	nobody	22-52805 22 days ago	22-52874 22 days ago	22-52867 22 days
38529	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Girth): `egirth ⊤ = 3` when there are at least 3 vertices	Since `Nontrivial` is not enough, we use the condition `3 ≤ ENat.card α`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	17/0	Mathlib/Combinatorics/SimpleGraph/Girth.lean	1	5	['SnirBroshi', 'github-actions', 'vlad902']	nobody	22-52748 22 days ago	23-43465 23 days ago	23-43458 23 days
37835	YaelDillies author:YaelDillies	doc(Algebra/Order): update mentions of `OrderedSemiring` and friends	As of #20676, it was replaced by `IsOrderedRing`. Not all docs were straightforward to update. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order label:t-algebra$	123/280	Counterexamples/HomogeneousPrimeNotPrime.lean,Counterexamples/OrderedCancelAddCommMonoidWithBounds.lean,Mathlib/Algebra/Group/Subgroup/Order.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Set/Monoid.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Order/WithTop/Untop0.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/Order/Filter/Germ/OrderedMonoid.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Valuation.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/Tactic/NormNum/Ineq.lean	37	9	['NoahW314', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts']	nobody	22-44684 22 days ago	22-44709 22 days ago	37-39836 37 days
38032	grunweg author:grunweg	perf: unbundle algebra from `ENormed*`, April 2026 version	Up-to-date version of #28803. Don't merge yet! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	81/78	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Defs.lean,Mathlib/Analysis/Normed/Group/Indicator.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/Normed/Group/Real.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Indicator.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/LpSeminorm/SMul.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean	20	6	['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	22-35667 22 days ago	34-70162 34 days ago	0-9 9 seconds
38193	Jun2M author:Jun2M	feat(Topology/Algebra/InfiniteSum): Deprecate generalized ENNReal lemmas	Following the PR #38489, this PR add deprecated tags to the original `ENNReal` lemmas and change the transitive children files to use the generalized lemmas rather than the deprecated lemmas. Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615) --- - [ ] depends on: #38489 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	483/329	Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEMeasurableOrder.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/Content.lean,Mathlib/MeasureTheory/Measure/Count.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasuredSets.lean,Mathlib/MeasureTheory/Measure/MutuallySingular.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/Measure/Tight.lean,Mathlib/MeasureTheory/Measure/Typeclasses/SFinite.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/Caratheodory.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/MeasureTheory/OuterMeasure/OfAddContent.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/NumberTheory/Transcendental/Liouville/Measure.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/WithDensity.lean,Mathlib/Probability/ProbabilityMassFunction/Basic.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Monad.lean,Mathlib/Probability/Process/LocalProperty.lean,Mathlib/Topology/Algebra/InfiniteSum/ENNReal.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Semicontinuity/Basic.lean	52	4	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	22-35663 22 days ago	24-16307 24 days ago	6-13863 6 days
38546	yhx-12243 author:yhx-12243	fix: universe issue in injective module	Change the definition of ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type v⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` into ```lean class Module.Injective : Prop where out : ∀ ⦃X Y : Type u⦄ [AddCommGroup X] [AddCommGroup Y] [Module R X] [Module R Y] (f : X →ₗ[R] Y) (_ : Function.Injective f) (g : X →ₗ[R] Q), ∃ h : Y →ₗ[R] Q, ∀ x, h (f x) = g x ``` to make it agree with `Module.Baer` and real mathematical definition, without universe issues. Since the criterion `Module.Flat` also uses `Type u` on testing modules. See discussions in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Universe.20issue.20about.20injective.20module . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-zulip label:t-algebra$	57/43	Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/RepresentationTheory/FinGroupCharZero.lean,Mathlib/RingTheory/Flat/Tensor.lean,Mathlib/RingTheory/LocalProperties/Injective.lean	6	5	['github-actions', 'grunweg', 'mathlib-bors', 'wwylele']	nobody	22-28139 22 days ago	22-28150 22 days ago	0-26133 7 hours
38568	SnirBroshi author:SnirBroshi	feat(SimpleGraph/Connectivity/Subgraph): `w.toSubgraph.IsInduced ↔ w.IsChordless`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	nobody	21-86056 21 days ago	21-86126 21 days ago	21-86119 21 days
36850	whocares-abt author:whocares-abt	feat(Combinatorics/SimpleGraph/Acyclic): deleting leaves from a tree gives a tree	Added theorem stating Deleting a leaf from a tree produces a tree.	t-combinatorics new-contributor awaiting-author	5/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	9	['YaelDillies', 'github-actions', 'vlad902']	YaelDillies assignee:YaelDillies	21-72719 21 days ago	21-72829 21 days ago	38-73648 38 days
34913	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Definition of complete intersection local ring	feat(RingTheory): Definition of Complete intersection ring In this PR we give the definition of complete intersection local ring by `epsilon_1(R)+ dim(R)` equal to span rank of its maximal ideal. We also proved for quotient of regular local ring, it is CI iff the ideal being quotient out is generated by regular sequence. --- - [ ] depends on: #26245 - [ ] depends on: #29533 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import merge-conflict	6900/300	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/CategoryTheory/Abelian/Ext.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/CohenStructureTheorem.lean,Mathlib/RingTheory/CompleteIntersection/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/Extension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Colon.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KoszulComplex/Cocomplex.lean,Mathlib/RingTheory/KoszulComplex/Complex.lean,Mathlib/RingTheory/KoszulComplex/Dual.lean,Mathlib/RingTheory/KoszulComplex/Homotopy.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean,Mathlib/RingTheory/Smooth/Field.lean,docs/references.bib	40	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-55046 21 days ago	101-54193 101 days ago	0-12 12 seconds
38482	dagurtomas author:dagurtomas	feat(CategoryTheory/Tactic): specialize_map attribute	--- - [ ] depends on: #38478 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP LLM-generated t-category-theory t-meta blocked-by-other-PR	861/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/Op.lean,Mathlib/Tactic/CategoryTheory/SpecializeMap.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/SpecializeMap.lean	9	2	['github-actions', 'mathlib-dependent-issues']	nobody	21-47946 21 days ago	24-31561 24 days ago	0-15 15 seconds
38567	dagurtomas author:dagurtomas	feat(CategoryTheory/Monoidal): autogenerate some lemmas instead of stating them explicitly	--- - [ ] depends on: #38482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	928/166	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Limits/HasLimits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean,Mathlib/CategoryTheory/Monoidal/PushoutProduct.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/Op.lean,Mathlib/Tactic/CategoryTheory/SpecializeMap.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/SpecializeMap.lean	12	2	['github-actions', 'mathlib-dependent-issues']	nobody	21-47749 21 days ago	21-86240 21 days ago	0-512 8 minutes
37774	weisbrja author:weisbrja	fix: change variables in `bicompl` to `Sort*` and add missing theorem mentioned in `bicompl` docs	[#mathlib4 > Why does Mathlib use Type* instead of Sort* in some places?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Why.20does.20Mathlib.20use.20Type.2A.20instead.20of.20Sort.2A.20in.20some.20places.3F/with/583882342) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict	6/1	Mathlib/Logic/Function/Basic.lean	1	8	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'weisbrja']	nobody	21-35846 21 days ago	21-35847 21 days ago	19-76858 19 days
37910	wwylele author:wwylele	feat(Geometry/Euclidean): volume of a simplex	This defines the volume of a simplex in Euclidean geometry, and shows that it agrees with measure theory. It also adds the basic set of lemmas (base-and-height formula, reindex, positivity, map, and restrict). Further properties of the volume will be in future PRs. Three new file s are introduced and organized in the following dependency chain: Def.lean -> MeasureSimplex.Lean -> Basic.lean The Def.lean file has the definition only. MeasureSimplex.lean pulls in measure theory. Basic.lean publicly imports Def.lean, and privately imports MeasureSimplex.lean. When a downstream file imports Basic.lean, the measure theory part is not exposed and all properties of the volume is provided. --- - [ ] depends on: #36018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	614/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/Basic.lean,Mathlib/Geometry/Euclidean/Volume/Def.lean,Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-35845 21 days ago	38-21824 38 days ago	0-473 7 minutes
38554	YaelDillies author:YaelDillies	chore(Combinatorics/SimpleGraph): use the auto-param in `loopless` more	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	5/13	Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Order/Cover.lean	8	6	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	21-33304 21 days ago	21-65645 21 days ago	21-67707 21 days
38588	thorimur author:thorimur	perf: use declaration range internals in unused instances in type linters	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import	57/41	Mathlib/Order/Basic.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean,MathlibTest/UnusedInstancesInType/Decidable.lean	3	3	['github-actions', 'leanprover-radar', 'thorimur']	nobody	21-23618 21 days ago	unknown	0-0 0 seconds
37445	edwin1729 author:edwin1729	feat(Topology/Order): set of compact elements, generating basic opens contained in a `Locale.PT`, is directed	This is (2/4) PRs culminating in a proof that "Scott Topologies over Algebraic DCPOs are Sober". In this PR we prove properties of a certain set of compact elements, w.r.t a `Locale.PT`. A `Locale.PT` can be thought of as a set of `Opens`. Precisely it is a Frame homomorphism from `Opens _` to `Prop` so we are essentially choosing certain `Opens` to form our set and this set has additional properties. Namely it is a completely prime filter: if the supremum of some Opens is contained than atleast one of the Opens must be contained. Take some `Locale.PT`, `x`. In this PR, we prove that the set of compact elements generating basic opens (compact elements generate topological basis see #31662) contained in `x` is directed. This set of compact elements defined above is important in subsequent parts of the proof since it fully determines `x`. - [ ] depends on: #31662 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR new-contributor merge-conflict	296/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18768 21 days ago	48-43246 48 days ago	0-463 7 minutes
37556	edwin1729 author:edwin1729	feat(Topology/Order): Locale.localePointOfSpacePoint if we have a Scott Topology from an Algebraic DCPO	(3/4) in a series of PRs proving that "Scott Topologies over Algebraic DCPOs are Sober" We prove here that the unit of the adjunction from `TopCat` to `Locale` defined in `Topology/Order/Category/FrameAdjunction.lean` is a surjective mapping, under the following condition: The underlying TopologicalSpace must be a Scott Topology generated with an underlying Algebraic DCPO structure. - [ ] depends on: #37445 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor blocked-by-other-PR merge-conflict	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18767 21 days ago	46-43267 46 days ago	0-1300 21 minutes
38077	b-mehta author:b-mehta	feat(Combinatorics/Schnirelmann): prove Mann's theorem	Lots of this was done in 2024, and so it needs heavy cleaning. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-combinatorics large-import merge-conflict	632/12	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Finite.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Set/Finite/Lemmas.lean	8	3	['github-actions', 'mathlib-merge-conflicts']	nobody	21-18642 21 days ago	unknown	0-0 0 seconds
38027	8e7 author:8e7	feat(Combinatorics/SimpleGraph/Star): define star graphs	Add a new definition `starGraph` and several key lemmas. Star graphs are a trivial class of tree, often used in constructive proofs regarding trees. An example use case is shown in #38334. --- All lemmas are hand written first, then golfed with the help of Claude Code. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	85/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Star.lean	2	39	['8e7', 'IvanRenison', 'JovanGerb', 'SnirBroshi', 'github-actions', 'vihdzp', 'vlad902']	nobody	21-5297 21 days ago	33-5243 33 days ago	35-3501 35 days
38580	mcdoll author:mcdoll	perf(Polynomial/HasseDeriv): explicit type annotations for `compHom`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	4/4	Mathlib/Algebra/Polynomial/HasseDeriv.lean	1	4	['github-actions', 'leanprover-radar', 'mcdoll']	nobody	21-2918 21 days ago	unknown	0-0 0 seconds
38560	Deicyde author:Deicyde	feat(Geometry/Manifold): `MfldCat` is a `CartesianMonoidalCategory`	We prove that the category `MfldCat` of C^n manifolds is a Cartesian monoidal category, and also derive the `BraidedCategory` instance. This PR introduces a new file `Geometry/Manifold/Category/MfldCat/CartesianMonoidal` closely mirroring the structure of `Algebra/Category/Grp/CartesianMonoidal.lean` --- - [ ] depends on: #38223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR new-contributor	281/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/Category/MfldCat/CartesianMonoidal.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	20-78413 20 days ago	unknown	0-0 0 seconds
38621	mariainesdff author:mariainesdff	feat(Algebra/SkewPolynomial/Basic): add more API	We add API for SkewPolynomial, including the definitions erase and update and results about coefficients and supports. Co-authored by: @xgenereux. --- - [ ] depends on: #38619 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	629/24	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	20-66048 20 days ago	20-66049 20 days ago	0-1715 28 minutes
38623	mariainesdff author:mariainesdff	WIP	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	44/2	Mathlib/Algebra/Order/Antidiag/Prod.lean	1	2	['github-actions']	nobody	20-64894 20 days ago	20-64951 20 days ago	0-17 17 seconds
36709	kim-em author:kim-em	feat(DefEqAbuse): suggest minimal @[implicit_reducible] workaround	This PR extends `#defeq_abuse` to suggest a minimal set of `@[implicit_reducible]` annotations that would make the failing tactic or command succeed with `backward.isDefEq.respectTransparency true`. When `#defeq_abuse` detects a failure, it now runs a greedy minimisation over semireducible definitions reachable from the goal/command, finding a (possibly non-unique) minimal subset that, when temporarily marked `@[implicit_reducible]`, fixes the issue. The result is reported as an `info` message: ``` info: Workaround: the following @[implicit_reducible] annotations (a possibly non-unique minimal set) would paper over this problem, but the real issue is likely a leaky instance somewhere. set_option allowUnsafeReducibility true attribute [implicit_reducible] MyPred ``` This is a workaround, not a fix — the real cause is usually a leaky instance (which `#check_instance` from https://github.com/leanprover-community/mathlib4/pull/36706 can diagnose). But it can be useful for quick debugging. New helpers: `collectCandidates`, `markImplicitReducible`, `withTempImplicitReducible`, `withTempImplicitReducibleCmd`, `suggestAnnotationsTac`, `suggestAnnotationsCmd`, `formatAnnotations`, `logAnnotationSuggestions`. 🤖 Prepared with Claude Code	t-meta LLM-generated	187/17	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	6	['github-actions', 'kim-em', 'mathlib-merge-conflicts', 'thorimur']	dwrensha and thorimur assignee:dwrensha assignee:thorimur	20-64462 20 days ago	20-64507 20 days ago	37-62711 37 days
36775	ADedecker author:ADedecker	feat: flip arguments for continuous linear maps under finite dimension assumptions	--- - [x] depends on: #36776 - [x] depends on: #36870 - [ ] depends on: #37435 - [ ] depends on: #37439 - [x] depends on: #37614 - [ ] depends on: #38168 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	540/32	Mathlib.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/Spaces/CompactConvergenceCLM.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/FiniteDimensionCLM.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	7	9	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	20-38654 20 days ago	49-50785 49 days ago	9-41060 9 days
37861	Jun2M author:Jun2M	feat(Combinatorics/Graph): connected graphs	This PR introduces - `IsConnectedComponentOf`, a graph is a connected component of another graph, and - `IsConnected`, a graph is a self component Under this definition, an empty graph is not connected. Co-authored-by: Peter Nelson [apn.uni@gmail.com](mailto:apn.uni@gmail.com) --- - [x] depends on: #37610 - [ ] depends on: #36756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	92/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Connected/Component.lean	2	6	['Jun2M', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues']	nobody	20-33296 20 days ago	31-49065 31 days ago	3-10047 3 days
37067	kbuzzard author:kbuzzard	feat: add_group tactic	Written by Claude Code, additivising the `group` tactic, although there were some problems which needed human input. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is me burning Claude credits as a result of this comment [#mathlib4 > MulAut and to_additive @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/MulAut.20and.20to_additive/near/581059625) . Just to be clear, all comments below are human-written by me with 0 AI assistance. To my amusement, naively additivising the `group` tactic to make an `add_group` tactic does not work. The problem is that the algorithm run by `group` involves adding `← zpow_neg_one` to the simp set, which rewrites `x⁻¹` to `x ^ (-1)` for `x` in any group: the idea is that `x ^ (z : Int)` is preferred in the algorithm and `x⁻¹` is eliminated. Amusingly, when additivised, this becomes `-x -> -1 • x` which then immediately becomes `(-1 • 1) • x` which then becomes `((-1 • 1) • 1) • x` etc etc, as the integers are themselves an additive group. So we need to find another way of normalising terms of the form `-x`. Claude found the following trick: drop `← neg_one_zsmul` and `neg_one_zsmul_add`, and use `neg_add_rev` and `neg_zero` to reduce `-(a+b)` and `-0`, use `zsmul_neg` to reduce `n • (-a)` to `(-n) • a` and then use things like `add_neg_cancel_right` and `neg_add_cancel_right` to do `-b + b` and `b + -b` together with some new `zsmul_neg_trick` lemmas which normalise `(n • b) + -b` to `(n - 1) • b`. etc. The idea is to ensure that any consecutive chains of `b`'s and `-b`'s and `z • b`'s will now all get amalgamated into something of the form `z • b`, but we cannot change `-b` to `-1 • b` so have to try harder than in the multiplicative case. Here is a detailed (human-written!) explanation of the difference between `Tactic/AddGroup.lean` and the additivisation of `Tactic/Group.Lean`. 1) Note that the `zpow_trick` lemmas in `Tactic/Group.lean` are additivised, so we import `Group.lean` in `AddGroup.lean` to access these additivised lemmas. 2) `Mathlib.Algebra.Group.Commutator` has no additive version (and it's not clear that it should have one), so we don't use an additive version of `commutatorElement_def` (which expands `⁅g₁, g₂⁆` to `g₁ * g₂ * g₁⁻¹ * g₂⁻¹`). Note: that means that we cannot additivise a test. 3) Line 67 of the additive file uses `neg_add_rev, neg_zero, zsmul_neg, ← neg_zsmul,` as a workaround for the looping ` ← zpow_neg_one`. 4) `Int.mul_neg, Int.neg_mul` are dropped (they don't seem to be needed, all tests are passing, ring_nf is probably doing this.) 5) `sub_eq_add_neg` is added: people use subtraction in additive groups; division doesn't seem to be covered for multiplicative groups? So `add_group` can solve `a + b - b = a` but `group` cannot solve `a * b / b = a`. *** There is also one fewer test in the `add_group` tests, as I had to remove the commutator test. I don't know much at all about tactic-writing, the PR is all Claude code, but a lot of it is to_additive copypasta. The review of the code above is my own.	t-meta LLM-generated awaiting-author	189/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/AddGroup.lean,MathlibTest/AddGroup.lean	4	21	['JovanGerb', 'SnirBroshi', 'github-actions', 'kbuzzard', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	20-28812 20 days ago	24-5508 24 days ago	28-31880 28 days
38364	openendings author:openendings	feat: create Order/DirectedCompletePartialOrder/Defs.lean	Define DirectedCompletePartialOrder and its interaction with iSup and sSup. --- A DirectedCompletePartialOrder is equivalently: - a partial order with LUBs of nonempty directed sets; - what happens when you remove ⊥ from a CompletePartialOrder; or - a ConditionallyCompletePartialOrder in which every directed set is BddAbove. Like CPOs, DCPOs are commonly studied in denotational semantics. Potential applications: - [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/590070848) -- defining infinite sums in an DCPO-enriched `AddCommMonoidWithTop` such as `ENat` or `ENNReal`. - [#Is there code for X? > Scott Induction](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Scott.20Induction/with/590112858) -- fixpoint theorems similar to `OmegaCompletePartialOrder`, generalised to arbitrary cardinalities. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	123/0	Mathlib.lean,Mathlib/Order/DirectedCompletePartialOrder/Defs.lean,docs/references.bib	3	4	['SnirBroshi', 'github-actions', 'openendings']	nobody	20-21560 20 days ago	26-11680 26 days ago	26-72899 26 days
36681	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Commute): the smallest nonzero ordinal that add-commutes with a given ordinal	For any ordinal `o`, `(ω ^ log ω o) + o % (ω ^ log ω o)` is the smallest nonzero ordinal that add-commutes with `o`. This value can also be calculated by considering the CNF of `o` with base `ω` and changing the first coefficient to `1`. --- The proofs involve annoying algebraic manipulations (to annihilate the tails as explained below), golfs welcome. Details on the math involved Think about the Cantor-normal form: #36664 shows `AddCommute o₁ o₂ ↔ ∃ (o : Ordinal) (n₁ n₂ : ℕ), o * n₁ = o₁ ∧ o * n₂ = o₂`. If you write a given ordinal `o` in CNF in base `ω` as `(ω ^ e₀) * c₀ + (ω ^ e₁) * c₁ + ...` then `o * n = (ω ^ e₀) * (c₀ * n) + (ω ^ e₁) * c₁ + ...`. Notice that only the leading term got multiplied by `n`, because the earlier copies of `o` annihilate all the tails except for the last one (e.g. `o * 2 = o + o = (ω ^ e₀) * c₀ + tail + (ω ^ e₀) * c₀ + tail = (ω ^ e₀) * c₀ + (ω ^ e₀) * c₀ + tail = (ω ^ e₀) * (c₀ * 2) + tail`). So given the characterization of `AddCommute`, if we keep the tail and remove the `* c₀` from the leading coefficient (effectively calculating `o / c₀`, we'll get the smallest ordinal that we can multiply by a natural number to get `o`. `o / (o / (ω ^ log ω o))` should also give the same smallest ordinal (and `o - (ω ^ log ω o) * (o / (ω ^ log ω o) - 1)`), but I chose the expression that fits the existing CNF definitions. Maybe a future PR can show they're all equal. - [x] depends on: #36664 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	71/1	Mathlib/SetTheory/Ordinal/Commute.lean,Mathlib/SetTheory/Ordinal/Principal.lean	2	25	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	vihdzp assignee:vihdzp	20-13274 20 days ago	20-13274 20 days ago	6-8534 6 days
37501	xgenereux author:xgenereux	feat(DedekindDomain/AdicValuation): `intValuation` on uniformizers is `exp (-1)`	This PR add the lemma `intValuation_val_uniformizer_eq` which is an application of #37497. Note that I've had to reorganize the files a little bit: 1. I wanted to import `Valuation.Discrete.Basic` in `AdicValuation` but this was not possible since there was a dependency in the other direction (`Valuation.Discrete.Basic` depended on `AdicValuation`). I don't think this makes sense - we want to have access to basic definitions on general valuation in an application file like `AdicValuation`. ~~The reorganization consist of moving the `IsDiscreteValuationRing` of `Valuation.Discrete.Basic` to `AdicValuation`.~~ The reorganization consist of moving the `IsDiscreteValuationRing` section to a new file. 2. I moved some lemmas out of `Mathlib.RingTheory.Valuation.Discrete.RankOne` to the parent file `Mathlib.RingTheory.Valuation.Discrete.Basic.`. These lemmas do not need the richer imports from `RankOne` and are needed in my application. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #37497 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	203/167	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Reduction.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/OrderOfVanishing/Noetherian.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/IsDiscreteValuationRing.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean	8	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	mattrobball assignee:mattrobball	20-12743 20 days ago	30-76293 30 days ago	38-68143 38 days
37747	JovanGerb author:JovanGerb	chore(Order/Filter/AtTopBot/Basic): use `to_dual`	This PR uses `to_dual` for `atTop`/`atBot`. A lot of theorems that have been tagged contain the expression `∀ a ≥ b, ...`, which means that their dual will be `∀ a, b ≥ a → ...`, which is obviourly undesirable. Hence, I would like to ask the reviewers to reconsider the possibility of merging #32985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	56/164	Mathlib/Order/Filter/AtTopBot/Basic.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	20-12742 20 days ago	41-51833 41 days ago	41-51826 41 days
37752	JovanGerb author:JovanGerb	chore(Order/CompleteLattice/Lemmas): use `to_dual`	Use `to_dual` for lemmas about `CompleteLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	27/56	Mathlib/Order/CompleteLattice/Lemmas.lean	1	1	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	20-12741 20 days ago	41-50509 41 days ago	41-50502 41 days
37753	JovanGerb author:JovanGerb	chore(Order/Filter/Basic): use `to_dual` for `≤ᶠ`	Use `to_dual` on lemmas about `EventuallyLE`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	19/6	Mathlib/Order/Filter/Basic.lean	1	2	['github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	20-12740 20 days ago	41-50374 41 days ago	41-50367 41 days
37073	kim-em author:kim-em	feat: add wrap_instance% using core's wrapInstance	This PR adds a new `wrap_instance%` term elaborator that delegates to Lean core's `wrapInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `wrap_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.wrapInstance`. Like `fast_instance%`, it reduces instances to constructor applications and reuses canonical sub-instances. Unlike `fast_instance%`, it works at `instances` transparency and delegates all normalization logic to core. The replaced sites cover: - Equiv/type-alias transfers (WithAbs, WithConv, WithVal, WithLp, TransferInstance) - Surjective constructors (Con, RingCon quotients, module congruences) - DFunLike leaf instances (MultilinearMap, ContinuousMultilinearMap, AlternatingMap, Intertwining) - Quotient instances (LinearAlgebra/Quotient/Defs) - inferInstanceAs% sites (StandardPart, Presentation/Core) - Miscellaneous (InfiniteAdeleRing, ZMod) This PR doesn't attempt to replace all `fast_instance%`; it gets more complicated! 🤖 Prepared with Claude Code		88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/WithConv.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	16	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	20-5821 20 days ago	20-5848 20 days ago	22-79349 22 days
37814	sglasman author:sglasman	feat: Equivalence between HopfAlgCat R and Hopf (ModuleCat R)	This PR resolves a TODO by demonstrating an equivalence of categories between two models of the category of Hopf algebras over a commutative ring R, that of Hopf objects in the module category of R and that of types with a `HopfAlgebra R` instance. --- AI declaration: I consulted with Claude on proof strategies. The proofs were ultimately written by me.	new-contributor large-import t-category-theory WIP	214/4	Mathlib/CategoryTheory/Monoidal/Hopf_.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean	2	5	['dagurtomas', 'github-actions', 'robin-carlier', 'sglasman']	kim-em assignee:kim-em	19-82931 19 days ago	25-45394 25 days ago	14-69757 14 days
38432	SnirBroshi author:SnirBroshi	feat(Logic/Relation): `Map r f g ≤ s ↔ r ≤ s.bicompl f g`	and the dual `s ≤ Relation.Map r f g ↔ s.bicompl f g ≤ r` which requires `f` and `g` to be bijective. Adds `Galois{Connection/Insertion/Coinsertion}` for the dual. The theorems are specialized to `onFun` instead of `bicompl` for when `f = g`. The `≤` theorems are spelled using `Subrelation` since `≤` is not yet available in this file, and `∀` for the `bicompl` theorems since `Subrelation` only supports homogeneous relations. A `GaloisConnection` for the iff in the title requires `f`/`g` to be bijective, but then we can get an `OrderIso` which is stronger (see #38499). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	119/28	Mathlib/Logic/Relation.lean,Mathlib/Order/GaloisConnection/Basic.lean	2	3	['SnirBroshi', 'github-actions', 'plp127']	nobody	19-78968 19 days ago	23-86181 23 days ago	25-21196 25 days
38612	SnirBroshi author:SnirBroshi	feat(Order/SuccPred/CompleteLinearOrder): `sSup s < x` iff theorems when we know if `x` is a successor pre-limit or not	Adds the following theorems (along with their duals and indexed versions): ```lean sSup_lt_iff_of_not_isSuccPrelimit : ¬IsSuccPrelimit x → sSup s < x ↔ ∀ a ∈ s, a < x le_sSup_iff_of_not_isSuccPrelimit : ¬IsSuccPrelimit x → x ≤ sSup s ↔ ∃ a ∈ s, x ≤ a Order.IsSuccPrelimit.sSup_lt_iff : IsSuccPrelimit x → sSup s < x ↔ ∃ a < x, ∀ b ∈ s, b < a Order.IsSuccPrelimit.le_sSup_iff : IsSuccPrelimit x → x ≤ sSup s ↔ ∀ a < x, ∃ b ∈ s, a ≤ b ``` They are similar to these existing theorems, but not the same: ```lean sSup_lt_iff : sSup s < x ↔ ∃ a < x, ∀ b ∈ s, b ≤ a le_sSup_iff_forall_lt : x ≤ sSup s ↔ ∀ a < x, ∃ b ∈ s, a < b ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	43/0	Mathlib/Order/SuccPred/CompleteLinearOrder.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	nobody	19-78769 19 days ago	20-75683 20 days ago	20-75676 20 days
37346	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `✅️ SimpleGraph.Walk.IsPath.getVert_injOn`: unchanged 🎉 * `✅️ SimpleGraph.Walk.length_bypass_le`: unchanged 🎉 * `✅️ Rat.floor_intCast_div_natCast`: unchanged 🎉 * `✅️ InnerProductGeometry.norm_eq_of_angle_sub_eq_angle_sub_rev_of_angle_ne_pi`: unchanged 🎉 * `✅️ padicNorm.zero_of_padicNorm_eq_zero`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge awaiting-zulip	7/45	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	22	['FernandoChu', 'bryangingechen', 'chenson2018', 'euprunin', 'faenuccio', 'github-actions', 'grunweg']	nobody	19-60363 19 days ago	19-60394 19 days ago	30-49603 30 days
37389	martinwintermath author:martinwintermath	chore(LinearAlgebra/SesquilinearForm): generalize `orthogonalBilin` in order to simplify definition of `orthogonal`	- generalize `Submodule.orthogonalBilin` to `CommSemiring` and `AddCommMonoid`, and to general sesquilinear forms with inputs from different modules. This enables subsequent changes. - redefine `BilinForm.orthogonal` in terms of `orthogonalBilin`. - reorder arguments of `Submodule.orthogonalBilin` to match other instances of duality across mathlib. For comparison Before ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_5, u_6} {R : Type u_1} {R₁ : Type u_2} {M : Type u_5} {M₁ : Type u_6} [CommRing R] [CommRing R₁] [AddCommGroup M₁] [Module R₁ M₁] [AddCommGroup M] [Module R M] {I₁ I₂ : R₁ →+* R} (N : Submodule R₁ M₁) (B : M₁ →ₛₗ[I₁] M₁ →ₛₗ[I₂] M) : Submodule R₁ M₁ ``` After ```lean4 Submodule.orthogonalBilin.{u_1, u_2, u_3, u_5, u_6, u_7} {R : Type u_1} {R₁ : Type u_2} {R₂ : Type u_3} {M : Type u_5} {M₁ : Type u_6} {M₂ : Type u_7} [CommSemiring R] [CommSemiring R₁] [CommSemiring R₂] [AddCommMonoid M] [Module R M] [AddCommMonoid M₁] [Module R₁ M₁] [AddCommMonoid M₂] [Module R₂ M₂] {I₁ : R₁ →+* R} {I₂ : R₂ →+* R} (B : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M) (N : Submodule R₁ M₁) : Submodule R₂ M₂ ``` A few fixes in other files have been necessary as well. This is an extract from #37381. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	28/21	Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	5	8	['eric-wieser', 'github-actions', 'martinwintermath', 'themathqueen', 'vihdzp']	ocfnash assignee:ocfnash	19-57029 19 days ago	19-56937 19 days ago	49-25739 49 days
37963	martinwintermath author:martinwintermath	feat(LinearAlgebra/SesquilinearForm): moving orthogonality to own file and adding lemmas	* Move `Submodule.orthogonalBilin` and all lemmas that use it from SesquilinearForm/Basic.lean to its own file SesquilinearForm/Orthogonal.lean. * Add the features proposed in #34007 to align with `PointedCone.dual`. --- - [ ] depends on: #37381 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra label:t-algebra$	389/190	Mathlib.lean,Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/IsometryEquiv.lean,Mathlib/LinearAlgebra/QuadraticForm/Radical.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Orthogonal.lean,docs/undergrad.yaml	15	2	['github-actions', 'mathlib-dependent-issues']	nobody	19-56791 19 days ago	36-21732 36 days ago	0-584 9 minutes
38168	ADedecker author:ADedecker	feat: if `E` is finite dimensional, `E →L[𝕜] F` has the product topology	--- - [x] depends on: #38164 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-analysis awaiting-author	235/29	Mathlib.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/Spaces/FiniteDimensionCLM.lean	3	7	['ADedecker', 'faenuccio', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues']	j-loreaux assignee:j-loreaux	19-54633 19 days ago	20-52136 20 days ago	4-66970 4 days
37381	martinwintermath author:martinwintermath	chore(LinearAlgebra/SesquilinearForm): deprecate `IsOrtho` and associated lemmas	First steps in cleaning up bilinearity and orthogonality. - deprecate `IsOrtho` and accompanying trivial lemmas (this also allows to shorten the proofs in `orthogonalBilin`). - deprecate `ortho_smul_right` and `ortho_smul_left` since now provable from simp. - remove uses of deprecated definitions. - replace `IsOrtho` in undergrad.yaml by `iIsOrtho`. See discussion at [#mathlib4 > Reorganizing bilinearity and orthogonality?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Reorganizing.20bilinearity.20and.20orthogonality.3F/with/582426197) Due to too agressive simplification I had to remove simp from - `QuadraticMap.associated_apply` - `QuadraticMap.isOrtho_polarBilin` --- - [ ] depends on: #37389 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	135/113	Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/IsometryEquiv.lean,Mathlib/LinearAlgebra/QuadraticForm/Radical.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,docs/undergrad.yaml	12	10	['github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mcdoll', 'vihdzp']	nobody	19-50037 19 days ago	48-25310 48 days ago	0-54358 15 hours
33485	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/Generation): prove the third part of Dieudonné's theorem	Prove the third part of Dieudonné's theorem : if `e : V ≃ₗ[K] V` is a product of `finrank K (V ⧸ e.fixedSubmodule) - 1` transvections and one dilatransvection, then it is not exceptional. Actually, we prove something slightly stronger : if `e : V ≃ₗ[K] V` is a product of a transvection and of `finrank K (V ⧸ e.fixedSubmodule) - 1` dilatransvections, then it is not exceptional. --- - [ ] depends on: #33347 - [ ] depends on: #33348 - [ ] depends on: #33387 - [ ] depends on: #33282 - [ ] depends on: #33392 - [ ] depends on: #33402 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	1122/16	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	13	['AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-28570 19 days ago	136-60171 136 days ago	0-955 15 minutes
33560	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/Generation): a linear equivalence is the product of dilatransvections	Prove that a linear equivalence `e` is the product of `V ⧸ e.fixedSubmodule` dilatransvections. (It cannot be a product of less.) --- - [ ] depends on: #33347 - [ ] depends on: #33348 - [ ] depends on: #33387 - [ ] depends on: #33282 - [ ] depends on: #33392 - [ ] depends on: #33402 - [ ] depends on: #33485 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	1222/3	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	12	['AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-28255 19 days ago	134-17992 134 days ago	0-1282 21 minutes
36701	kim-em author:kim-em	feat(DefEqAbuse): detect and report leaky instance binder types	This PR adds `#check_instance` and `checkInstance` to `Mathlib/Tactic/FastInstance.lean` to diagnose individual instances for leaky data-field binder types, and integrates this into `#defeq_abuse` so it automatically reports leaky instances. A new `withDisabledInstance` helper temporarily evicts an instance from the discrimination tree (via `Attribute.erase` + `withoutModifyingEnv`), allowing `makeFastInstance` to compute the canonical form without `trySynthInstance` trivially finding the instance being checked. `#defeq_abuse` now checks instances used in the failing goal/command for leakiness and reports them alongside the isDefEq failure diagnostics. Example: `#check_instance` ```lean def MyNat := ℕ -- Without fast_instance%, the `add` field has binder type ℕ rather than MyNat. instance leakyAdd : Add MyNat := ⟨Nat.add⟩ #check_instance leakyAdd -- ❌ 'leakyAdd': leaky binder types detected. -- The data field `add` has binder type ℕ where MyNat is expected. -- The `fast_instance%` elaborator may be useful as a repair or band-aid: -- `instance : ... := fast_instance% ` instance fixedAdd : Add MyNat := fast_instance% ⟨Nat.add⟩ #check_instance fixedAdd -- ✅ 'fixedAdd': canonical (re-inferred form agrees at instances transparency) ``` 🤖 Prepared with Claude Code	LLM-generated awaiting-author t-meta merge-conflict	317/17	Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean	4	43	['JovanGerb', 'Vierkantor', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'ocfnash']	Vierkantor assignee:Vierkantor	19-25311 19 days ago	56-39070 56 days ago	6-60386 6 days
36740	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `AlgebraicGeometry.Scheme.isBasis_affineOpens`: unchanged 🎉 * `SimpleGraph.Walk.takeUntil_eq_take`: 263 ms before, 180 ms after 🎉 * `SimpleGraph.Walk.dropUntil_eq_drop`: 382 ms before, 261 ms after 🎉 * `Int.image_Ico_emod`: unchanged 🎉 * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	8	['artie2000', 'chenson2018', 'github-actions', 'mathlib-merge-conflicts']	nobody	19-25309 19 days ago	19-25310 19 days ago	43-5868 43 days
37191	artie2000 author:artie2000	chore(Geometry/Convex/Cone/Pointed): clean up variables	* Remove variable overwrites by changing `variable` declarations and renaming variables * Rename variables to maintain rough type-consistency within the file * Reorganise sections in order of increasing typeclass strength * Bring explicit/implicit variables in line with convention This PR doesn't change any declarations beyond changing variable explicitness. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry awaiting-author merge-conflict	148/129	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	15	['YaelDillies', 'artie2000', 'github-actions', 'martinwintermath', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	19-25184 19 days ago	25-69738 25 days ago	25-78701 25 days
33692	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/SpecialLinearGroup): generation of the special linear group by transvections	Consider transvections in the special linear group. Prove that they generate the group. Prove Dieudonné's refinement about the minimal number needed to write an element as a product of transvections. --- - [ ] depends on: #33560 - [ ] depends on: #33485 - [ ] depends on: #33402 - [ ] depends on: #33392 - [ ] depends on: #33387 - [ ] depends on: #33348 - [ ] depends on: #33347 - [ ] depends on: #33282 - [x] depends on: #32757 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	1459/18	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	7	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-22095 19 days ago	132-18126 132 days ago	0-93 1 minute
33882	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/SpecialLinearGroup): commutators in the special linear group	Over a field, prove the following results : * transvections are conjugate in the general linear group; except in rank 2, they are conjugate in the special linear group. * the special linear group is equal to its commutator subgroup (except when it doesn't, ie, in rank 2 over a field with 2 or 3 elements). --- - [x] depends on: #33347 - [x] depends on: #33348 - [x] depends on: #33387 - [x] depends on: #33282 - [ ] depends on: #33392 - [ ] depends on: #33402 - [ ] depends on: #33485 - [x] depends on: #32757 - [ ] depends on: #33560 - [ ] depends on: #33692 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra label:t-algebra$	1991/31	Mathlib.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	11	7	['AntoineChambert-Loir', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-21763 19 days ago	126-51937 126 days ago	0-50 50 seconds
33916	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/SpecialLinearGroup/Simple): simplicity of the projective special linear group.	Let `K` be a field and `V` be a `K`-vector space. * `SpecialLinearGroup.isQuasiSimpleGroup`: if `finrank K V` is at least 3, or if `finrank K V = 2` and `K` has at least 4 elements, then `SpecialLinearGroup K V` is quasi-simple, namely, the quotient group `SpecialLinearGroup K V ⧸ Subgroup.center (SpecialLinearGroup K V)` is simple. --- - [x] depends on: #32757 - [x] depends on: #33347 - [x] depends on: #33282 - [x] depends on: #33348 - [x] depends on: #33387 - [ ] depends on: #33392 - [ ] depends on: #33402 - [ ] depends on: #33485 - [ ] depends on: #33560 - [ ] depends on: #33692 - [ ] depends on: #33882 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra label:t-algebra$	2213/31	Mathlib.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/SpecialLinearGroup/Simple.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	12	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-21735 19 days ago	125-51885 125 days ago	0-1083 18 minutes
37535	grunweg author:grunweg	chore(FiberBundle/Trivialisation): tag with grind	I am unsure if all of these are good grind lemmas; close examination is welcome. I left XXX comments with my questions; there are about 3 different questions repeating a few times. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author merge-conflict	49/19	Mathlib/Topology/FiberBundle/Trivialization.lean	1	7	['chenson2018', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	urkud assignee:urkud	19-16706 19 days ago	43-73311 43 days ago	2-73668 2 days
37603	Parcly-Taxel author:Parcly-Taxel	refactor: review of `SetSemiring`	* Rename `Set.up` and `SetSemiring.down` to `SetSemiring.ofSet` and `SetSemiring.toSet` respectively. Unprotect both and make them equivalences, following `FreeMonoid`. * Derive `CompleteAtomicBooleanAlgebra` for `SetSemiring` immediately. * Add `imageHom_id` and `imageHom_comp`. The three existing lemmas about `imageHom` are coalesced into `imageHom_apply`. Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568.	maintainer-merge merge-conflict	120/165	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean	2	42	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel']	nobody	19-16699 19 days ago	19-16700 19 days ago	22-62470 22 days
37723	xgenereux author:xgenereux	feat(Adjoin/Polynomial/Transcendental): Adjoining transcendental elements	This PR establishes some basic properties about `A[y]` when `y` is transcendental over `A`. These are mostly just carried over from `A[X]`. - Move `algEquivOfTranscendental` in the newly created file `Mathlib.RingTheory.Adjoin.Polynomial.Transcendental` - Add `Algebra.adjoin.evalOfTranscendental`. This is technically very similar to `Algebra.adjoin.liftSingleton` but the definition is much simpler. It is also currently more general in the sense that it doesn't require `A` to be a field. - Some basic instances from `Polynomial`. Note that these are actually theorems because of the hypothesis `(h : Transcendental R s)` everywhere. I've also added a `Fact` version to allow the possibility of instances. Last note : I initially considered adding some results in `RingTheory.Polynomial.Quotient` where I golfed the file a tiny bit. I removed the unused results but kept the golf. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #36439 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR merge-conflict	135/65	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/Adjoin/Polynomial/Basic.lean,Mathlib/RingTheory/Adjoin/Polynomial/Bivariate.lean,Mathlib/RingTheory/Adjoin/Polynomial/Transcendental.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean	8	5	['github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'riccardobrasca']	nobody	19-16697 19 days ago	42-7891 42 days ago	0-1922 32 minutes
37806	Raph-DG author:Raph-DG	chore(Topology): rename `Function.locallyFinsupp` to `Function.LocallyFinsupp`	And move single from `LocallyFinSuppWithin` to `LocallyFinsupp`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author merge-conflict	343/146	Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Complex/ValueDistribution/FirstMainTheorem.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Asymptotic.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Basic.lean,Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Topology/LocallyFinsupp.lean	8	11	['Raph-DG', 'chrisflav', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	nobody	19-16696 19 days ago	32-37558 32 days ago	4-50448 4 days
38329	jcommelin author:jcommelin	chore: tighten down public/exposed API of AlgebraicClosure	This PR tightens down the API of AlgebraicClosure, by making few parts of FieldTheory/IsAlgClosed/AlgebraicClosure.lean public and/or exposed. We still need to expose the main definition. It would be great if we can unexpose it in the future. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	73/53	Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/FieldTheory/Differential/Liouville.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Norm/Transitivity.lean,Mathlib/RingTheory/Trace/Basic.lean	9	26	['eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts', 'plp127', 'riccardobrasca']	nobody	19-16682 19 days ago	19-16683 19 days ago	7-41851 7 days
38444	astrainfinita author:astrainfinita	refactor(Order/(Conditionally)CompletePartialOrder): extends `OrderSupSet`	--- - [ ] depends on: #35674 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	438/219	Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.lean,Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/Int/ConditionallyCompleteOrder.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/CompletePartialOrder.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Copy.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	33	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	19-16676 19 days ago	24-81767 24 days ago	0-2484 41 minutes
38349	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph/Coloring/VertexColoring): rename to `Vertex.lean`	After #37525 moved `Coloring.lean` to `Coloring/VertexColoring.lean`, a [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500) poll decided to avoid duplicating the word "Coloring", so this renames `Coloring/VertexColoring.lean` to `Coloring/Vertex.lean`. --- I planned to make this move in #33313 but it isn't moving along, so I think it's best to split the renaming. #37546 adds module deprecation [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-combinatorics	6/6	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Partition.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean	7	2	['github-actions', 'mathlib-merge-conflicts']	nobody	19-13427 19 days ago	19-13453 19 days ago	27-13592 27 days
36667	NoneMore author:NoneMore	feat(ModelTheory): add `exClosure` definition for first-order formulas	Prepare for moving realizations between elementarily equivalent structures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	37/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	2	['github-actions']	fpvandoorn assignee:fpvandoorn	19-12802 19 days ago	64-84287 64 days ago	64-84280 64 days
37682	SabrinaJewson author:SabrinaJewson	refactor(Order/OrdContinuous): redefine left and right order continuity to not require preserving ⊥/⊤	`LeftOrdContinuous` currently requires that `f ⊥ = ⊥`, but this means that many functions that are perhaps intuitively left-continuous (like `f x = x + 1` on `ℝ≥0`) are not. In particular, this change means that functions between conditionally complete lattices are `LeftOrdContinuous` iff they are monotone and topologically left continuous (see `MonotoneOn.map_csSup_of_continuousWithinAt` for the reverse direction). If one wants the concept that existed before, one can either accept the `f ⊥ = ⊥` hypothesis separately or, if the function is between complete lattices, use the left side of a `GaloisConnection` (which is equivalent, although I think this is not yet in Mathlib). This removes the definitional equality of the type in favour of a structure. Since most of the time users will be working with the `sSup` versions and not with `IsLUB`, I think this is justified. As a consequence, this removes the definitional equality between `LeftOrdContinuous` and `RightOrdContinuous` of the dual – the latter could be redefined to re-add this, but we do have conversion functions. `LeftOrdContinuous.continuousWithinAt_Iic` is rewritten to accomodate these changes; the superfluous `DenselyOrdered` assumption is also removed. [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/LeftOrdContinuous.20requires.20f.28.E2.8A.A5.29.20.3D.20.E2.8A.A5/near/582932491) --- - [x] depends on: #37735 - [x] depends on: #37772 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	52/38	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	10	['SabrinaJewson', 'astrainfinita', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	bryangingechen assignee:bryangingechen	19-12796 19 days ago	39-21694 39 days ago	41-18796 41 days
38748	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Basic): `G.edgeSet ⊆ s.sym2 ↔ G.support ⊆ s`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	19/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	2	1	['github-actions']	nobody	19-7831 19 days ago	19-7903 19 days ago	19-7896 19 days
38635	Fieldnote-Echo author:Fieldnote-Echo	chore(scripts): handle simple to_additive deprecations	Closes #38550. This updates `scripts/add_deprecations.sh` so that, when a renamed declaration is near an existing `@[to_additive]` attribute, the script also emits the additive deprecation alias in the common default-name case. For example, `foo_mul -> bar_mul` now produces: ```lean @[deprecated (since := "...")] alias foo_add := bar_add @[to_additive existing, deprecated (since := "...")] alias foo_mul := bar_mul ``` This is intentionally conservative and text-based, matching the existing script. It handles common name translations such as mul/add, prod/sum, one/zero, inv/neg, and div/sub, and skips cases that look like they need less common to_additive name generation. Tested with a local six-case fixture and a scratch Lean file confirming that the generated alias form compiles and produces deprecation warnings for both names. I opened this as draft because I still count as a new contributor under the LLM-assisted PR policy. I have one merged mathlib PR (#36443), and this is a one-file script patch that I reviewed/tested manually. I'll leave it as draft unless a maintainer gives it the green light to flip ready. I used Claude assistance while drafting and testing the patch. I reviewed the final diff manually and tested the generated Lean form locally.	CI new-contributor	121/10	scripts/add_deprecations.sh	1	4	['Fieldnote-Echo', 'SnirBroshi', 'github-actions']	kim-em assignee:kim-em	18-84026 18 days ago	unknown	0-0 0 seconds
37930	vlad902 author:vlad902	chore(SimpleGraph): move `cycleGraph` to its own file	PR #34797 re-defined `cycleGraph` independent of `circulantGraph`. Now move the definition of `cycleGraph` to its own file so that the definition can be used without importing the algebra hierarchy. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	173/148	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	3	2	['github-actions', 'mathlib-merge-conflicts']	nobody	18-82738 18 days ago	18-82761 18 days ago	18-83141 18 days
38752	joelriou author:joelriou	feat(CategoryTheory): the bicategory of triangulated categories	See Zulip [#general > backward.isDefEq.respectTransparency @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency/near/591988149) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory	168/0	Mathlib.lean,Mathlib/CategoryTheory/Triangulated/Bicategory.lean	2	1	['github-actions']	nobody	18-71912 18 days ago	18-73457 18 days ago	0-2 2 seconds
38759	chrisflav author:chrisflav	chore(CategoryTheory): more experiments with unification hints	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	106/2	Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Simps/UnifHintAttr.lean,MathlibTest/Simps.lean	4	1	['github-actions']	nobody	18-67556 18 days ago	unknown	0-0 0 seconds
38732	eric-wieser author:eric-wieser	fix: revert and fix #38703	#38703 removed the canary intended to detect a broken lemma, without fixing the lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	4/11	Mathlib/Algebra/Group/Action/Units.lean	1	5	['github-actions', 'kbuzzard', 'mathlib-bors']	nobody	18-65104 18 days ago	18-65104 18 days ago	0-57214 15 hours
37832	YaelDillies author:YaelDillies	chore(Algebra/Order/GroupWithZero): flatten `Unbundled` folder	The algebraic order classes are unbundled now. --- More thought is needed to do the same for `Algebra.Order.Monoid` since filenames conflict. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra t-order label:t-algebra$	20/20	Mathlib.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Algebra/Order/GroupWithZero/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Bounds.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/GroupWithZero/OrderIso.lean,Mathlib/Algebra/Order/GroupWithZero/Submonoid.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Nonneg/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean	19	3	['github-actions', 'mathlib-merge-conflicts']	nobody	18-47623 18 days ago	18-47649 18 days ago	37-52759 37 days
37736	EtienneC30 author:EtienneC30	feat: API for binomial distribution	Provide basic API regarding the binomial distribution, computing the measure of singletons and writing it as a sum of Dirac masses. Provide basic results regarding integrability. Deprecate [PMF.binomial](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Probability/ProbabilityMassFunction/Binomial.html#PMF.binomial). --- As I explain in the module docstring, I am proving most results in two versions: one for the measure over `Nat` and one for the cast version. This obviously leads to some duplications, I think it's fine but I am happy to hear other ideas. - [ ] depends on: #37534 - [ ] depends on: #37541 - [x] depends on: #37543 - [x] depends on: #37739 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR large-import	196/18	Mathlib/Data/Set/Card.lean,Mathlib/Probability/Distributions/Binomial.lean,Mathlib/Probability/Distributions/Poisson/PoissonLimitThm.lean,Mathlib/Probability/ProbabilityMassFunction/Binomial.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	18-43879 18 days ago	unknown	0-0 0 seconds
38742	Jun2M author:Jun2M	feat(Tactic): simproc for `Eq.rec`	Note: This PR was written with a lot of help from AI (Opus 4.7). I am still learning Lean meta programming. I would very much welcome any feedback. Problem: There are a lot of `cast` like functions for various definitions in Mathlib: [`Fin.cast`](https://leanprover-community.github.io/mathlib4_docs/Init/Data/Fin/Basic.html#Fin.cast), [`List.Vector.congr`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Vector/Defs.html#List.Vector.congr), [`SimpleGraph.Walk.copy`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Combinatorics/SimpleGraph/Walk/Operations.html#SimpleGraph.Walk.copy), [`Path.cast`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Path.html#Path.cast), [`Sym.cast`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Sym/Basic.html#Sym.cast), [`Partition.copy`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Partition/Basic.html#Partition.copy), [`Finpartition.copy`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Partition/Finpartition.html#Finpartition.copy) & etc. All of these functions does the same as `h ▸ a` where `h` is a proof of equality of something in the type of `a`. I think this is caused because proving the properties about `h ▸ a` is too difficult without extra tooling. All of the above follows the pattern where it is an indexed type where it contains * some data * proof that the data is related to the index and casting only changes the second part. The trouble happens when I would like to talk about the data of the casted object. There is `congr_eqRec` lemma in Battery that are exactly for this situation but even after adding `simp` tag to it, it is not being used. [Here](https://live.lean-lang.org/#codez=JYWwDg9gTgLgBAWQIYwBYBtgCMBQeCmAHkuOvnAN6CNwHAFxwAqAnmPgFQC%2BlYdcNgSYR84ggApQIYLhSRwsvKlwAUhXgGUArlhgtyinkgCUBuItS8ZAXlnH6puIA7SOIQMA6AG5J0cK4Xee6VlhMcDhwcADOoDwA2gDGEAB2AOZQAPr4AI4ASvixALoExKTkFAlwILyAqIRKPPQAYsBlimUA1HAAjEYmZvRlViA23Q5wYK4eXlZgfl60gcGhEVFwcYkp6dm5BThEJGBklABqvMysnJQA4mpRZOdQSGBmB1LqcG5wAO68TyYA6rznLh%2BngA1nAXm5jHZ6C8rO9BnZHD9XPgACZJfDhbxwH4uVHozGzWTzMKRcDLeLJNKZHL5BYAWjpcCg%2BAAZo1yBS1tTcnAAPypOBmH6FXb7ajHHRnCiY%2BD0VT4eAKEwiXgiJCwYAwYCJCKQnoRLEweEIuAq%2BhqjVanVGtQKkzyxVdKxmuYhElRXnk1ZUjb5N1wBlM1nsuCcn00vkCswiPA4IA), all of these simp tactics fail. Solution: This PR introduces a simproc `castData` (I would welcome a name suggestion) and attribute `cast_data`. When it sees `f ... (h ▸ x)` where `f` is tagged with `cast_data`, `castData` will try to simplify to `f ... x`. This simproc proves all 4 examples linked above. Hopefully this removes the need for all the `cast`-like definition and their APIs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated	122/7	Mathlib.lean,Mathlib/CategoryTheory/Sites/IsSheafFor.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Subtype.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/CastData.lean	9	9	['Jun2M', 'SnirBroshi', 'github-actions', 'leanprover-radar', 'mathlib-bors']	nobody	18-43055 18 days ago	19-14772 19 days ago	0-2835 47 minutes
38766	yuanyi-350 author:yuanyi-350	chore(AlgebraicTopology/DoldKan/GammaCompN): remove an erw	- rewrites `N₂Γ₂ToKaroubiIso_inv_app` with a single `simp` invocation on the relevant splitting definitions Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology codex LLM-generated awaiting-author	1/1	Mathlib/AlgebraicTopology/DoldKan/GammaCompN.lean	1	2	['dagurtomas', 'github-actions']	nobody	18-34368 18 days ago	18-34368 18 days ago	0-28342 7 hours
37531	EtienneC30 author:EtienneC30	feat: integral of the binomial distribution	Provide the probability of singletons under the binomial distribution and compute the expectation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	212/6	Mathlib/Data/Set/Card.lean,Mathlib/Probability/Distributions/Binomial.lean,Mathlib/Probability/Distributions/SetBernoulli.lean	3	2	['github-actions', 'mathlib-merge-conflicts']	nobody	18-27008 18 days ago	unknown	0-0 0 seconds
38764	yuanyi-350 author:yuanyi-350	chore(AlgebraicGeometry/Modules/Tilde): remove an erw	- rewrites the naturality proof in `fromTildeΓNatTrans` by making the `FullSubcategory.comp_hom` and `NatTrans.comp_app` steps explicit in the `rw` chain Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-algebraic-geometry LLM-generated awaiting-author	3/1	Mathlib/AlgebraicGeometry/Modules/Tilde.lean	1	2	['dagurtomas', 'github-actions']	nobody	18-25195 18 days ago	18-25195 18 days ago	0-37520 10 hours
38390	mortarsanjaya author:mortarsanjaya	feat(Data/Nat/Cast/Order/Basic): introduce new class `IsMonotoneNatCast`	The class says that `Nat.cast` is monotone in an `AddMonoidWithOne`. Basically, we use this class when we only care about comparing the elements of a monoid that comes from the `Nat`s (so we do not have to care about the compatibility between the additive structure of the monoid and its order structure). --- Other than that, I'm also reorganizing some section naming, and I change the proof of the `Nontrivial` instance at the bottom to using `NeZero.nontrivial`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	28/18	Mathlib/Data/Nat/Cast/Order/Basic.lean	1	7	['github-actions', 'leanprover-radar', 'mathlib-bors', 'mortarsanjaya', 'vihdzp']	nobody	18-22729 18 days ago	18-22730 18 days ago	7-85443 7 days
38747	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Basic): more `neighborSet` and `IsIsolated` lemmas	--- `neighborSet_mono` moved from `Maps.lean` to `Basic.lean` with a simpler proof [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	72/17	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	4	2	['github-actions', 'vlad902']	nobody	18-18017 18 days ago	18-24973 18 days ago	18-79255 18 days
37870	Jun2M author:Jun2M	feat(Combinatorics/Graph): `Simple` typeclass for `Graph`	This PR introduces two type classes on `Graph`: `Loopless` and `Simple`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	93/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Simple.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	18-10556 18 days ago	18-10580 18 days ago	37-45006 37 days
37819	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): add `OmegaCompletePartialOrder` instance for `WithBot` with basic `ωScottContinuous` lemmas	This is a modification of #34093. See #34093 for details. --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order merge-conflict	337/10	Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot.lean	6	5	['Komyyy', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	17-86307 17 days ago	17-86307 17 days ago	22-11204 22 days
38537	astrainfinita author:astrainfinita	refactor(Order): make completeness typeclasses mixins	This PR turns completeness typeclasses that are weaker than `CompleteLattice` into mixins. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F/) Refactoring `CompleteLattice` would touch many more files, and there are still some unresolved design issues. I've modified 100 files and still haven't determined the correct approach. In this PR, `ConditionallyCompleteLattice` only requires `PartialOrder`, so that it can be used for types like `NonemptyInterval`.	t-order WIP merge-conflict	578/580	Counterexamples/SorgenfreyLine.lean,Mathlib/Algebra/FiniteSupport/Basic.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Group/CompleteLattice.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.lean,Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Int/ConditionallyCompleteOrder.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Function/EssSup.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/BourbakiWitt.lean,Mathlib/Order/Category/OmegaCompletePartialOrder.lean,Mathlib/Order/CompleteLatticeIntervals.lean,Mathlib/Order/CompletePartialOrder.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Basic.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/AtTopBot/CompleteLattice.lean,Mathlib/Order/Filter/Extr.lean,Mathlib/Order/Interval/Set/OrdConnectedLinear.lean,Mathlib/Order/IsNormal.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/Monotone/Extension.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/OrdContinuous.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/PartialSups.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Order/SuccPred/Basic.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/Order/SupClosed.lean,Mathlib/Probability/IdentDistrib.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/Probability/Process/LocalProperty.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/MetricSpace/ProperSpace/Lemmas.lean,Mathlib/Topology/OmegaCompletePartialOrder.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Bornology.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/IntermediateValue.lean,Mathlib/Topology/Order/IsLUB.lean,Mathlib/Topology/Order/LeftRightLim.lean,Mathlib/Topology/Order/LiminfLimsup.lean,Mathlib/Topology/Order/Monotone.lean,Mathlib/Topology/Order/MonotoneConvergence.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Order/Rolle.lean,Mathlib/Topology/Semicontinuity/Basic.lean,MathlibTest/Delab/SupInf.lean	76	4	['astrainfinita', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	17-86303 17 days ago	23-10916 23 days ago	0-2782 46 minutes
38716	YaelDillies author:YaelDillies	feat(Algebra/Order): `NNRat.cast_sub`	From AddCombi --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	29/22	Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/NNRat/Order.lean,Mathlib/Data/Rat/Star.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/Topology/Instances/Rat.lean	10	1	['github-actions']	nobody	17-78319 17 days ago	17-78383 17 days ago	17-82759 17 days
38751	YaelDillies author:YaelDillies	feat(Data/Finset/Density): more `NNRat.cast` lemmas	From AddCombi --- - [ ] depends on: #38716 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import blocked-by-other-PR label:t-algebra$	69/39	Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/NNRat/Order.lean,Mathlib/Data/Rat/Star.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/Topology/Instances/Rat.lean	10	2	['github-actions', 'mathlib-dependent-issues']	nobody	17-77915 17 days ago	18-72806 18 days ago	0-1009 16 minutes
38799	YaelDillies author:YaelDillies	refactor(Combinatorics/Additive/Energy): switch to the compact normalisation	In additive combinatorics, it is natural for the group of study to be considered with its compact normalisation (making it have total mass 1) and its dual group to be considered with its discrete normalisation (so that each singleton has mass 1), instead of the other way around and even when both groups are finite. In this case, I will soon generalise the energy to compact abelian groups, and possibly even to all abelian groups equipped with a mean. This PR is a first step towards that by renormalising the energy to be between 0 and 1. From AddCombi --- - [ ] depends on: #38751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics large-import	180/94	Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Combinatorics/Additive/Energy.lean,Mathlib/Combinatorics/SetFamily/LYM.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/NNRat/Order.lean,Mathlib/Data/Rat/Star.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/Topology/Instances/Rat.lean	11	2	['github-actions', 'mathlib-dependent-issues']	nobody	17-72565 17 days ago	17-73866 17 days ago	0-11 11 seconds
38795	YaelDillies author:YaelDillies	feat(Algebra/Group/Action/Pointwise): `#(s ∩ (a • t)) = #{x ∈ s ×ˢ t \| x.1 / x.2 = a}`	The `Finset` lemma already exists. From AddCombi --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/18	Mathlib/Algebra/Group/Action/Pointwise/Finset.lean,Mathlib/Algebra/Group/Action/Pointwise/Set/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean	3	1	['github-actions']	nobody	17-72112 17 days ago	17-72172 17 days ago	17-74383 17 days
37342	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): non-primitive corecursion for Seq: more `FriendlyOperation` API	This is a continuation of #35072. This PR adds more API about friendly operations: * `FriendlyOperation.coind`: a coinductive principle for proving that operation is friendly * `FriendlyOperationClass.eq_of_bisim`: a generalisation of `Seq.eq_of_bisim'` for proving two sequences are equal. --- - [x] depends on: #35072 This is a part of the `compute_asymptotics` tactic (#28291). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-meta awaiting-author	161/0	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean	1	5	['github-actions', 'joneugster', 'mathlib-dependent-issues']	joneugster assignee:joneugster	17-68827 17 days ago	17-68827 17 days ago	28-74243 28 days
38784	justus-springer author:justus-springer	feat(Algebra/Algebra/RestrictScalars): Generalize `RestrictScalars`	Generalize `RestrictScalars` to allow restricting along a ring morphism `f : R →+* S` where `R` is not necessaritly commutative. This is a step towards resolving defeq abuses between `(restrictScalars f).obj M` and `M` for `M : ModuleCat R`, mentioned in the file `ModuleCat/ChangeOfRings.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	240/149	Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Analysis/Normed/Module/Basic.lean	4	2	['eric-wieser', 'github-actions']	nobody	17-55800 17 days ago	18-42722 18 days ago	0-7 7 seconds
38413	yuanyi-350 author:yuanyi-350	doc(CategoryTheory): fix typos	In this PR, we used a Codex agent to scan the `CategoryTheory` directory to check for typos in the docstrings. We picked out some of the more obvious errors to fix in this PR. Depends on #38441 Co-authored-by: @LehengChen --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated codex documentation t-category-theory WIP	35/34	Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Abelian/Injective/Basic.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Adjunction/Triple.lean,Mathlib/CategoryTheory/Center/Localization.lean,Mathlib/CategoryTheory/FiberedCategory/Fiber.lean,Mathlib/CategoryTheory/Functor/Const.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Functor/OfSequence.lean,Mathlib/CategoryTheory/Functor/Trifunctor.lean,Mathlib/CategoryTheory/GradedObject/Bifunctor.lean,Mathlib/CategoryTheory/Groupoid/Basic.lean,Mathlib/CategoryTheory/IsomorphismClasses.lean,Mathlib/CategoryTheory/Join/Final.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/Filtered.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Iso.lean,Mathlib/CategoryTheory/Limits/Shapes/StrictInitial.lean,Mathlib/CategoryTheory/Limits/SmallComplete.lean,Mathlib/CategoryTheory/Limits/Types/Yoneda.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/SmallShiftedHom.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Over.lean,Mathlib/CategoryTheory/Monoidal/Action/End.lean,Mathlib/CategoryTheory/Monoidal/Braided/Multifunctor.lean	32	3	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	17-50012 17 days ago	25-49232 25 days ago	0-2163 36 minutes
37878	YaelDillies author:YaelDillies	chore(Combinatorics/SimpleGraph): avoid structure relation predicates	Relation predicates used to be `def`s over a `forall`, which was optimal for usability in fields of other structures. This changed in #35591 and #35192 as a byproduct of reducing apparent code duplication. Unfortunately, the usability issue was overlooked. This PR restores usability by dropping the use of those relation classes that are `structure`s, ie `Std.Irrefl` and `Std.Transitive`. It also uses more widely the `simp` auto-param on `SimpleGraph.loopless`. --- - [ ] depends on: #38554 I would also be happy to revert #35591 and #35192 since this demonstrates a good use case for the `def` versions of the relation predicates. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	43/53	Archive/Wiedijk100Theorems/Konigsberg.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Tripartite.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/ModelTheory/Graph.lean,Mathlib/Order/Cover.lean,Mathlib/Order/RelClasses.lean	19	17	['SnirBroshi', 'Vierkantor', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-44286 17 days ago	22-41553 22 days ago	16-34670 16 days
38169	tb65536 author:tb65536	chore(GroupTheory/Finiteness): make `Subgroup.FG` a class	This PR refactors `Subgroup.FG` to be a class to match `Group.FG`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	37/20	Mathlib/GroupTheory/Commutator/Finite.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/Rank.lean,Mathlib/GroupTheory/Schreier.lean	4	10	['JovanGerb', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	17-37099 17 days ago	17-51167 17 days ago	31-39319 31 days
38056	Deicyde author:Deicyde	feat: topological vector bundle homomorphisms	This PR implements topological vector bundle morphisms. - [ ] depends on: #38023 - [ ] depends on: #37946 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict	805/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Morphism.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-32152 17 days ago	unknown	0-0 0 seconds
37784	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Basic): `ConditionallyCompleteLinearOrderBot (WithBot α)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	29/0	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	17-12964 17 days ago	41-9334 41 days ago	41-9327 41 days
38192	Jun2M author:Jun2M	feat(Order/ConditionallyCompleteLattice): ConditionallyCompleteSemiLatticeInf	This PR introduces `ConditionallyCompleteSemilatticeSup/Inf`, Sup/Inf only versions of `ConditionallyCompleteLattice`. This is a preliminary PR for #37620, showing that `Graph` forms a `ConditionallyCompleteSemilatticeInf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order help-wanted merge-conflict	109/33	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Copy.lean	3	13	['Jun2M', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	17-10219 17 days ago	31-16953 31 days ago	0-5 5 seconds
38586	chrisflav author:chrisflav	feat(RingTheory): algebra maps between finite étale algebras are locally finite split	From Pi1. --- - [ ] depends on: #38649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory large-import blocked-by-other-PR merge-conflict	335/2	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/LocalRing/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Module.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/TotallySplit.lean	8	5	['chrisflav', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-10212 17 days ago	21-36446 21 days ago	0-1 1 second
38142	SnirBroshi author:SnirBroshi	feat(Order/SuccPred/CompleteLinearOrder): generalize `csSup_mem_of_not_isSuccLimit`	Given `s.Nonempty` and `BddAbove s` we can conclude `sSup s ∈ s` using either: - `csSup_mem_of_not_isSuccPrelimit`, given `ConditionallyCompleteLinearOrder` and `¬IsSuccPrelimit (sSup s)` - `csSup_mem_of_not_isSuccLimit`, given `ConditionallyCompleteLinearOrderBot` and `¬IsSuccLimit (sSup s)` We generalize both to a theorem that requires `ConditionallyCompleteLinearOrder` and `¬IsSuccLimit (sSup s)`. This creates 8 theorems that require `¬IsSuccPrelimit` but are now easily proved with the `¬IsSuccLimit` theorems, we replace `csSup_mem_of_not_isSuccPrelimit`/`exists_eq_ciSup_of_not_isSuccPrelimit` with their primed `ConditionallyCompleteLinearOrderBot` theorems, and deprecates the other 6. Tags a random `to_dual` (in `ConditionallyCompleteLattice/Basic.lean`) to let us `to_dual`ize the new lemmas. --- ~~Should we also deprecate the 8 theorems that require `¬IsSuccPrelimit` and now use `mt`?~~ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	55/42	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/SetTheory/Cardinal/Order.lean	3	9	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	17-7253 17 days ago	17-7277 17 days ago	32-5676 32 days
38841	SnirBroshi author:SnirBroshi	feat(Mathlib/Order/SuccPred/Limit): more `WithTop` lemmas about `IsMin`/`CovBy`/`IsSuccLimit`	--- Continues the work from #38244 We should probably also have such lemmas for `WithTopBot`/`WithBotTop`, but that's for another day [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	111/30	Mathlib/Order/Cover.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/Order/WithBot.lean	3	1	['github-actions']	nobody	16-63215 16 days ago	16-73731 16 days ago	16-74531 16 days
38213	WenrongZou author:WenrongZou	feat(FormalGroup): APIs for formal group homomorphism	This PR introduces some APIs for homomorphism between formal group laws. --- - [ ] depends on: #38052 - [ ] depends on: #37618 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	425/11	Mathlib/RingTheory/FormalGroup/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Evaluation.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	16-57847 16 days ago	30-48641 30 days ago	0-1101 18 minutes
38316	tannerduve author:tannerduve	feat(Order/OmegaCompletePartialOrder): least fixed point and Scott induction	Adds `ContinuousHom.lfp` for endomorphisms on an ωCPO with `⊥`, as the `ωSup` of the iterate chain from `⊥`, together with `map_lfp`, `isFixedPt_lfp`, `lfp_le_fixed`, `isLeast_lfp`, and the Scott induction theorem `lfp_induction` (specialized from a more general seed-based `ωSup_iterate_induction`). For `Part.fix`, adds: * `Part.exists_mem_approx_of_mem_fix`: if `y ∈ Part.fix g x`, some finite approximation of `g` already contains `y`. * `Part.Fix.approx_eq_iterate_bot` and `Part.Fix.approxChain_eq_iterateChain`: bridges between `Fix.approx`/`approxChain` and `f^[n] ⊥`/`iterateChain`. * `Part.fix_eq_lfp`: `Part.fix g = ContinuousHom.lfp (.ofFun g hc)` when `g` is ω-Scott continuous. * `Part.fix_scott_induction`: Scott induction specialized to `Part.fix`. * `Part.fix_induction_mem`: membership induction on `Part.fix`, derived from `fix_scott_induction`.	new-contributor	114/0	Mathlib/Control/LawfulFix.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,docs/references.bib	3	2	['github-actions']	nobody	16-38040 16 days ago	28-14142 28 days ago	28-14661 28 days
38018	matthewjasper author:matthewjasper	feat(Algebra): expand Subalgebra.restrictScalars API	Add an instance for the original algebra structure, the implied scalar tower instances, and the algebra equivalence with the original subalgebra. Use this to remove some `set_option backward.isDefEq.respectTransparency`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	53/14	Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean	4	2	['eric-wieser', 'github-actions']	mariainesdff assignee:mariainesdff	16-12622 16 days ago	35-25562 35 days ago	35-27172 35 days
38589	vlad902 author:vlad902	feat(SimpleGraph): add universal vertex predicate	Add the predicate `G.IsUniversal v` to indicate that `v` is a universal vertex, i.e. connected to all other vertices in `G`. This matches the recently added `G.IsIsolated v` predicate for isolated vertices. Co-authored-by: Justin Lai --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	63/10	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean	5	4	['8e7', 'github-actions', 'vlad902']	nobody	15-84160 15 days ago	21-30481 21 days ago	21-30474 21 days
38853	ldct author:ldct	chore: tag set lemmas with @[push]	Tag set theory lemmas for pushing intersection, union and complement --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	31/4	Mathlib/Data/Set/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanAlgebra/Set.lean,MathlibTest/push.lean	4	1	['YaelDillies', 'github-actions']	nobody	15-69107 15 days ago	15-69107 15 days ago	0-18718 5 hours
38358	yuanyi-350 author:yuanyi-350	doc(1000.yaml): note more formalised theorems	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation maintainer-merge	9/2	docs/1000.yaml	1	12	['YaelDillies', 'github-actions', 'grunweg', 'vihdzp', 'yuanyi-350']	nobody	15-68117 15 days ago	15-68179 15 days ago	26-69828 26 days
38634	Maldooor author:Maldooor	feat(MeasureTheory): `restrict_absolutelyContinuous_restrict`	Adding three lemmas about absolute continuity of restrictions of measures to subsets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	19/0	Mathlib/MeasureTheory/Measure/Restrict.lean	1	4	['EtienneC30', 'Maldooor', 'github-actions']	EtienneC30 assignee:EtienneC30	15-67153 15 days ago	15-67153 15 days ago	18-11937 18 days
37252	artie2000 author:artie2000	feat(Algebra/Group/Submonoid/Support): properties of submonoid support	* Prove how the support of a submonoid interacts with various operations --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	50/1	Mathlib/Algebra/Group/Submonoid/Support.lean	1	9	['eric-wieser', 'github-actions', 'themathqueen']	themathqueen assignee:themathqueen	15-49836 15 days ago	15-49836 15 days ago	37-50338 37 days
37562	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add several lemmas about when `Walk.bypass` and `Walk.cycleBypass` do nothing	Co-authored-by: Vlad Tsyrklevich --- - [ ] depends on: #37577 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	160/79	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	4	8	['IvanRenison', 'SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vlad902']	nobody	15-23586 15 days ago	15-23587 15 days ago	0-1043 17 minutes
37578	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemma `Walk.IsCircuit.egirth_le_length`	--- - [x] depends on: #37574 - [ ] depends on: #37577 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	123/79	Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	15-22669 15 days ago	15-22670 15 days ago	0-2051 34 minutes
38890	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Basic): more `WithTop` instances	Adds the following instances: ``` CompleteLattice α → CompleteLattice (WithTop α) CompleteLinearOrder α → CompleteLinearOrder (WithBot α) ConditionallyCompleteLinearOrder α → ConditionallyCompleteLinearOrder (WithTop α) ConditionallyCompleteLinearOrder α → ConditionallyCompleteLinearOrderBot (WithBot α) ``` and some simp lemmas to help. --- These `#synth`s all succeed after this PR: (code) ```lean variable {α : Type} [Preorder α] #synth Preorder αᵒᵈ #synth Preorder <\| WithTop α #synth Preorder <\| WithBot α #synth Preorder <\| WithTopBot α #synth Preorder <\| WithBotTop α variable {α : Type} [PartialOrder α] #synth PartialOrder αᵒᵈ #synth PartialOrder <\| WithTop α #synth PartialOrder <\| WithBot α #synth PartialOrder <\| WithTopBot α #synth PartialOrder <\| WithBotTop α variable {α : Type} [LinearOrder α] #synth LinearOrder αᵒᵈ #synth LinearOrder <\| WithTop α #synth LinearOrder <\| WithBot α #synth LinearOrder <\| WithTopBot α #synth LinearOrder <\| WithBotTop α variable {α : Type} [CompleteLattice α] #synth CompleteLattice αᵒᵈ #synth CompleteLattice <\| WithTop α -- new #synth CompleteLattice <\| WithBot α #synth CompleteLattice <\| WithTopBot α #synth CompleteLattice <\| WithBotTop α variable {α : Type} [CompleteLinearOrder α] #synth CompleteLinearOrder αᵒᵈ #synth CompleteLinearOrder <\| WithTop α #synth CompleteLinearOrder <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLattice α] #synth ConditionallyCompleteLattice αᵒᵈ #synth ConditionallyCompleteLattice <\| WithTop α #synth ConditionallyCompleteLattice <\| WithBot α #synth CompleteLattice <\| WithTopBot α #synth CompleteLattice <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLinearOrder α] #synth ConditionallyCompleteLinearOrder αᵒᵈ #synth ConditionallyCompleteLinearOrder <\| WithTop α -- new #synth ConditionallyCompleteLinearOrderBot <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α variable {α : Type} [ConditionallyCompleteLinearOrderBot α] #synth ConditionallyCompleteLinearOrder αᵒᵈ #synth CompleteLinearOrder <\| WithTop α #synth ConditionallyCompleteLinearOrderBot <\| WithBot α -- new #synth CompleteLinearOrder <\| WithTopBot α #synth CompleteLinearOrder <\| WithBotTop α ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	63/9	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean	1	1	['github-actions']	nobody	15-16439 15 days ago	15-16515 15 days ago	15-16508 15 days
37179	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemmas about left and right elements of `SimpleGraph.sum`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	18/0	Mathlib/Combinatorics/SimpleGraph/Sum.lean	1	3	['WilliamCoram', 'github-actions']	b-mehta assignee:b-mehta	15-12753 15 days ago	54-28563 54 days ago	54-28556 54 days
38872	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable`	- replaces the `aeSeq`-based construction in `measurable_limit_of_tendsto_metrizable_ae` with a direct choice of the pointwise limit - proves a.e. measurability via `aemeasurable_of_tendsto_metrizable_ae` and then takes the measurable representative Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	11/19	Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	15-12744 15 days ago	15-57432 15 days ago	15-57425 15 days
38875	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Covering/Besicovitch`	- shortens the proof of `r_t0` in `exists_closedBall_covering_tsum_measure_le` by turning the contradiction argument into a direct lambda - replaces the manual `simp only` proof with `mem_iUnion₂` and a final `simp [r, this]` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	3/8	Mathlib/MeasureTheory/Covering/Besicovitch.lean	1	2	['github-actions', 'yuanyi-350']	RemyDegenne assignee:RemyDegenne	15-12741 15 days ago	15-56275 15 days ago	15-56268 15 days
38876	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable`	- rewrites `memLp_trim_of_mem_lpMeasSubgroup` to use `hf.mk f` instead of unpacking `hf.choose` - shortens the norm comparison to a direct rewrite with `eLpNorm_trim` and `hf.ae_eq_mk` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	3/8	Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	15-12740 15 days ago	15-55940 15 days ago	15-55933 15 days
38881	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic`	- shortens `stronglyMeasurable_in_set` by inlining the restricted approximation sequence and folding the `hg_eq` / `hg_zero` helper lemmas into the two `by_cases` branches Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	7/13	Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	15-12737 15 days ago	15-53883 15 days ago	15-53876 15 days
38882	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/AEMeasurableOrder`	- replaces the manual `μ t = 0` to `ae` conversion with `measure_eq_zero_iff_ae_notMem` - rewrites the two density arguments in `aemeasurable_of_exist_almost_disjoint_supersets` using `s_dense.exists_between` and `mem_iUnion₂` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	7/18	Mathlib/MeasureTheory/Function/AEMeasurableOrder.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	15-12736 15 days ago	15-53664 15 days ago	15-53657 15 days
38871	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SimpleGraph): add parity lemmas for outer and inner vertices	Adds three lemmas to `SimpleGraph.DegreeSum`: - `sum_degrees_option_zmod_two`: the handshaking lemma for `Option I` over ZMod 2 - `degree_none_zmod_two_eq_sum`: simp-normal form of the above - `card_degree_one_option_eq_outer_zmod_two`: under degree bound ≤ 2, count of degree-1 inner vertices equals outer vertex degree mod 2	t-combinatorics new-contributor	65/3	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	6	['0xTerencePrime', 'SnirBroshi', 'github-actions']	nobody	15-1125 15 days ago	15-57753 15 days ago	15-57746 15 days
38897	0xTerencePrime author:0xTerencePrime	feat(Combinatorics/SetFamily): formalize 1D Sperner's Lemma parity	Formalizes the 1-dimensional Sperner's Lemma (parity version): given a coloring of the `n + 1` vertices of a subdivided line segment with two colors (`ZMod 2`), if the two endpoints have different colors, then the number of color-changing edges is odd. This is distinct from `IsAntichain.sperner` in `SetFamily.LYM`, which concerns antichains in a power set. This file formalizes the topological/combinatorial parity statement used as the base case in higher-dimensional Sperner arguments. ## Key declarations - `SpernerColoring`: type-safe coloring via `Fin (n + 1) → ZMod 2` - `edgeDiff`: color difference on adjacent vertices, computed in `ZMod 2` - `totalDiff`: telescoping sum of all edge differences - `diffEdges`: the `Finset` of bichromatic (color-changing) edges - `sperner_1d`: main theorem — `Odd (diffEdges c).card` ## Design notes - Using `Fin (n + 1) → ZMod 2` instead of `ℕ → ZMod 2` makes boundary conditions unrepresentable at the type level, eliminating out-of-bounds cases entirely. - The proof reduces to a telescoping sum in `ZMod 2`, using `CharTwo.add_self_eq_zero` to cancel all interior vertices, avoiding parity case splits. This is intended as the 1D base case, the approach generalizes to higher-dimensional Sperner's Lemma in future work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	133/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Sperner1D.lean	2	3	['github-actions', 'grunweg']	nobody	14-78759 14 days ago	15-2509 15 days ago	15-2502 15 days
38750	openendings author:openendings	feat(Data/Nat): add padicValNat_add_eq_min	Add lemmas for `padicValNat` mirroring the [e]multiplicity API, including - padicValNat_eq_of_dvd_of_not_dvd - padicValNat_add_of_gt - padicValNat_add_eq_min --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	36/0	Mathlib/Data/Nat/MaxPowDiv.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'openendings']	nobody	14-75784 14 days ago	15-14880 15 days ago	3-62762 3 days
37724	xgenereux author:xgenereux	feat(UniqueFactorizationDomain/Multiplicity): WfDvdMonoid.max_power_factor for finset	A version of `WfDvdMonoid.max_power_factor` for finsets/finsupp. That is, we take the highest power which divides everything in the finset. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	66/10	Mathlib/RingTheory/UniqueFactorizationDomain/Multiplicity.lean	1	2	['chrisflav', 'github-actions']	chrisflav assignee:chrisflav	14-60898 14 days ago	14-60898 14 days ago	27-34531 27 days
37688	grunweg author:grunweg	feat: try using grind as gcongr discharger	Let's see what benchmarks say! Also, this exposes some underlying bug in the gcongr discharger handling (which I have worked around in the handful of places hitting it). --- - [x] depends on: #37591 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict	73/109	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2020Q2.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Order/Ring/Int.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/TangentCone/Seq.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Order.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Real/Basic.lean,Mathlib/GroupTheory/Archimedean.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/NumberTheory/Bertrand.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Transcendental/Liouville/Basic.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/Tactic/GCongr.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/Polynomial.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	55	13	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	14-60408 14 days ago	42-74244 42 days ago	0-7 7 seconds
37364	kim-em author:kim-em	feat(Tactic/Linter): add `auxLemma` linter for auto-generated declaration references	This PR adds a syntax linter that flags explicit references to auto-generated auxiliary declarations such as `_proof_N`, `match_N`, `_match_N`, and `_sizeOf_N`. These names are internal to the Lean elaborator and are not stable across refactors (e.g. reordering fields in a structure can renumber `_proof_` indices). The linter matches precisely: it requires the suffix after the prefix to be all digits, so `_proof_helper` would not be flagged. It only inspects identifier syntax nodes, so references in comments and docstrings are ignored. Current hits in Mathlib (suppressed with `set_option linter.style.auxLemma false`): - `Mathlib/CategoryTheory/Functor/Category.lean` — `hcomp._proof_2` - `Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean` — `constFormalMultilinearSeries.match_1.eq_2` - `Mathlib/Data/List/Sigma.lean` — `_sizeOf_1` Companion PR to track these suppressions in the tech debt report: https://github.com/leanprover-community/mathlib-ci/pull/17 🤖 Prepared with Claude Code	t-linter awaiting-author	87/1	Mathlib.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/AuxLemma.lean,MathlibTest/CompileInductive.lean,MathlibTest/interactiveUnfold.lean,MathlibTest/toAdditive.lean	10	35	['github-actions', 'grunweg', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	14-58404 14 days ago	14-58433 14 days ago	8-22290 8 days
38930	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): quotient of a finitely group by a subgroup which is finitely generated under normal closure is finitely presented	Adds `quotient` theorem which states that the quotient of a finitely presented group by a subgroup which is finitely generated in the normal closure is finitely presented. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import	9/0	Mathlib/GroupTheory/FinitelyPresentedGroup.lean	1	3	['github-actions', 'homeowmorphism', 'mathlib-bors']	nobody	14-57675 14 days ago	14-57903 14 days ago	0-8 8 seconds
38127	riccardobrasca author:riccardobrasca	feat: add ClassGroup.extendedHom	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra t-ring-theory label:t-algebra$	110/6	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/RingTheory/ClassGroup/Basic.lean,Mathlib/RingTheory/ClassGroup/ExtendedHom.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/UniqueFactorizationDomain/ClassGroup.lean	9	17	['faenuccio', 'github-actions', 'mathlib-merge-conflicts', 'riccardobrasca']	mattrobball assignee:mattrobball	14-54189 14 days ago	18-69625 18 days ago	32-3572 32 days
38870	JovanGerb author:JovanGerb	chore(Data/Set/Finite/Basic): fix `Fintype ({a} : Set α)` instance	This PR fixes a `implicit_reducible` diamond: there were two different instances on `Fintype ({a} : Set α)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	9/8	Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/Finite/Monad.lean	5	3	['JovanGerb', 'github-actions', 'sgouezel']	nobody	14-48729 14 days ago	14-47698 14 days ago	1-52 1 day
37295	wwylele author:wwylele	feat(Analysis/InnerProductSpace): generalized determinant of a rectangle matrix / linear map	This is the volume factor of a linear map --- I have encountered the expression `sqrt(det(T' * T))` a few times in various places but it doesn't look like it has a standard name and entry in mathlib, so this adds it. Zulip thread [#Is there code for X? > (norm of) "determinant" of map between inner product spaces](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.28norm.20of.29.20.22determinant.22.20of.20map.20between.20inner.20product.20spaces/with/581776873) One motivation to define this is to state volume formula under transformations. From Measure theory and fine properties of functions: - Lemma 3.1: for linear map $L : \mathbb{R}^n \to \mathbb{R}^m$, we have $\mathcal{H}^n(L(A)) = [ L ] \mathcal{L}^n(A)$. This is proved in this PR at `euclideanHausdorffMeasure_image_eq_normDet_mul_volume` - Theorem 3.8, for (not necessarily linear) $f : \mathbb{R}^n \to \mathbb{R}^m$ ($n \le m$) and $\mathcal{L}^n$-measurable set $A \subset \mathbb{R}^n$, we have $\int_A J f dx = \int_{\mathbb{R}^m} \mathcal{H}^0(A \cap f\^{-1}\{y\}) d\mathcal{H}^n(y)$, where $J f$ is the `normDet` of the rectangular Jacobian matrix AI usage disclosure: AI was used in the following parts - searching for related literature for an appropriate name - generate draft proofs for some lemma to verify their correctness, though the final code has been completely rewritten by me. - [ ] depends on: #37918 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	480/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/NormDet.lean,docs/references.bib	4	18	['copilot-pull-request-reviewer', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'themathqueen', 'wwylele']	j-loreaux assignee:j-loreaux	14-35808 14 days ago	14-35546 14 days ago	48-23701 48 days
38002	Raph-DG author:Raph-DG	feat(Topology): Relating irreducible components of a space to codimension one points in non dense subsets	In this PR we show that the coheight zero points of a sober space (in the specialization order) correspond to the irreducible components. Furthermore, we show that the coheight one points of any non dense subset p of X (in the specialization order on p) have coheight zero in the specialization order on X. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	103/0	Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Minimal.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Sober.lean	5	3	['ADedecker', 'github-actions', 'mathlib-merge-conflicts']	urkud assignee:urkud	14-35217 14 days ago	14-35254 14 days ago	31-14520 31 days
38601	khwilson author:khwilson	feat(Topology/Semicontinuity/Hemicontinuity): characterizations of hemicontintuous notions	In the previous PR we introduced two new notions attached to correspondences: having open lower sections and having an open graph. This commit introduces several useful characterizations of these notions and uses them to prove several constructions around hemicontinuous maps --- - [ ] depends on: #38600 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	413/10	Mathlib/Topology/Semicontinuity/Defs.lean,Mathlib/Topology/Semicontinuity/Hemicontinuity.lean	2	3	['github-actions', 'j-loreaux', 'mathlib-dependent-issues']	nobody	14-32373 14 days ago	21-6219 21 days ago	0-1005 16 minutes
38893	mcdoll author:mcdoll	chore: fix diamonds in separation quotient	The following two fail on master but succeed on the branch: ``` example [AddMonoid M] [ContinuousAdd M] : instNSMul (M := M) = AddMonoid.toNSMul := by with_reducible_and_instances rfl example [AddGroup G] [IsTopologicalAddGroup G] : instZSMul (G := G) = SubNegMonoid.toZSMul := by with_reducible_and_instances rfl ``` --- I am not sure whether this solution is better, or just deleting the instances. Especially a low-priority `inferInstance` instance seems a bit weird. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	2/2	Mathlib/Topology/Algebra/SeparationQuotient/Basic.lean	1	4	['eric-wieser', 'github-actions', 'j-loreaux']	nobody	14-22682 14 days ago	14-22682 14 days ago	0-72248 20 hours
38831	kbuzzard author:kbuzzard	chore(Algebra/HierarchyDesign): tidy up	We don't have `TopologicalField` any more. I've changed it to a more appropriate example. Also, the TODO in this file was ported from mathlib3 which had `topological_ring` and `ordered_ring`; both of these hierarchies have now been decoupled from the algebra hierarchy now. I changed examples to normed examples as this is still not decoupled (and maybe never will be). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	3/3	Mathlib/Algebra/HierarchyDesign.lean	1	3	['YaelDillies', 'github-actions', 'j-loreaux']	nobody	14-18500 14 days ago	14-18500 14 days ago	2-65409 2 days
32294	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): distance from second intersection with circumcircle	Add the following lemma: given a triangle ABC, suppose an angle bisector from A through the incenter or excenter I meets the circumcircle again at X (including the case of an external bisector at A tangent to the circle, in which case X = A). Then XB = XI (= XC, by applying this lemma again). This is a standard configuration: https://en.wikipedia.org/wiki/Incenter%E2%80%93excenter_lemma --- - [ ] depends on: #30981 - [ ] depends on: #30982 - [ ] depends on: #32019 - [ ] depends on: #32021 - [ ] depends on: #32023 - [ ] depends on: #32270 - [ ] depends on: #32290 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	189/0	Mathlib/Geometry/Euclidean/Angle/Incenter.lean	1	5	['github-actions', 'jsm28', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'peakpoint']	eric-wieser assignee:eric-wieser	14-12971 14 days ago	52-37625 52 days ago	52-38408 52 days
37984	loefflerd author:loefflerd	feat: abstract theory of measures	General foundations of non-archimedean measure theory (intended for applications to Iwasawa algebras) --- - [x] depends on: #38701	t-topology	458/0	Mathlib.lean,Mathlib/NumberTheory/Padics/Measure/Basic.lean,Mathlib/NumberTheory/Padics/Measure/Group.lean,Mathlib/NumberTheory/Padics/Measure/Topology.lean	4	2	['github-actions', 'mathlib-dependent-issues']	PatrickMassot assignee:PatrickMassot	14-12965 14 days ago	14-27355 14 days ago	14-28076 14 days
38049	WilliamCoram author:WilliamCoram	feat: lemmas towards showing gaussNorm on MvPowerSeries is an absolute value	We prove lemmas: ``gaussNorm_mul_le`` and ``gaussNorm_le_mul`` which will allow us to show it is an absolute value on Mv restricted power series. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	144/1	Mathlib/RingTheory/MvPowerSeries/GaussNorm.lean	1	4	['WilliamCoram', 'github-actions']	alreadydone assignee:alreadydone	14-12964 14 days ago	34-42309 34 days ago	34-42302 34 days
38098	astrainfinita author:astrainfinita	chore: make `SMul.comp.smul` `implicit_reducible`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	2/1	Mathlib/Algebra/Group/Action/Defs.lean	1	3	['astrainfinita', 'github-actions', 'leanprover-radar']	themathqueen assignee:themathqueen	14-12963 14 days ago	33-3422 33 days ago	33-3415 33 days
38880	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/LpSpace/Complete`	- shortens `ae_tendsto_of_cauchy_eLpNorm'` by rewriting the telescoping partial sums in `hx.hasSum.tendsto_sum_nat` directly and concluding with `add_const`, instead of introducing an intermediate eventual `∃ l` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	4/20	Mathlib/MeasureTheory/Function/LpSpace/Complete.lean	1	2	['Parcly-Taxel', 'github-actions', 'yuanyi-350']	kex-y assignee:kex-y	14-12958 14 days ago	15-54157 15 days ago	15-54150 15 days
38883	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/AEMeasurableSequence`	- rewrites `iSup` by filtering directly along `aeSeq_eq_fun_ae hf hp`, instead of proving a subset statement about `aeSeqSet` and then using `measure_mono_null` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	2/6	Mathlib/MeasureTheory/Function/AEMeasurableSequence.lean	1	2	['github-actions', 'yuanyi-350']	kex-y assignee:kex-y	14-12957 14 days ago	15-53445 15 days ago	15-53438 15 days
38895	emlis42 author:emlis42	chore(Algebra/ContinuedFractions): golf	This PR simplifies some proofs in `Algebra/ContinuedFractions`	t-algebra new-contributor label:t-algebra$	39/63	Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean	7	2	['github-actions']	nobody	14-11475 14 days ago	14-16686 14 days ago	15-4982 15 days
37714	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Floor/Defs): `Nat.cast` is strictly monotone in `FloorSemiring` and `FloorRing`	As title says, and without the `IsOrderedRing` assumption. Other than that, I removed the `IsOrderedRing` assumption from pretty much all the lemmas in `Algebra/Order/Floor/Defs` that could possibly have this assumption removed, and reduced some `IsStrictOrderedRing` assumptions to `IsOrderedRing` + `Nontrivial`. Due to strict monotonicity, we can also provide `CharZero` instance on `FloorSemiring` and `FloorRing`. Thus we can remove the `NeZero` and `Nontrivial` instances on them. The changes on `/Ring` and `/Semiring` are trivial changes due to some lemmas not requiring an `IsOrderedRing` instance anymore. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	96/39	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean	5	24	['dagurtomas', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mortarsanjaya']	eric-wieser assignee:eric-wieser	13-83669 13 days ago	17-59440 17 days ago	41-58923 41 days
37062	tannerduve author:tannerduve	feat(Computability): Turing join and semilattice structure on Turing degrees	## Summary - Add `Partrec.kronecker` (equality test) and `Partrec.join` (disjoint union by parity) in `Partrec.lean` - Prove `Nat.RecursiveIn` is closed under computable conditionals (`cond_const`, `cond`) - Show each component reduces to the join (`left_le_join`, `right_le_join`) and the join is the least upper bound (`join_le`) - Establish `SemilatticeSup` instance on `TuringDegree`	t-computability new-contributor large-import	311/15	Mathlib/Computability/Partrec.lean,Mathlib/Computability/RecursiveIn.lean,Mathlib/Computability/TuringDegree.lean	3	7	['Komyyy', 'github-actions', 'mathlib-merge-conflicts', 'tannerduve']	Komyyy assignee:Komyyy	13-83577 13 days ago	35-48571 35 days ago	36-24458 36 days
38170	maddycrim author:maddycrim	feat(Algebra/Module/FinitePresentation): Finitely Presented Module Lemma	From FLT Project Main Definitions: `Module.FinitePresentation.exists_fin_exact` : A finitely presented module M admits an exact sequence F' -> F -> M -> 0 where F' and F are finite free modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	9/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	17	['chrisflav', 'github-actions', 'maddycrim', 'themathqueen', 'vlad902']	nobody	13-74115 13 days ago	13-74115 13 days ago	17-43852 17 days
36815	EtienneC30 author:EtienneC30	feat: a measurable space structure on the type of continuous maps	Endow the type `C(X, Y)` of continuous maps from `X` to `Y` with the Borel sigma-algebra coming from the compact-open topology and show that, under some assumptions on `X` and `Y`, this is equal to the restriction of the product sigma-algebra over `X → Y`. Provide a measurable equivalence between `{f : X → Y // Continuous f}` and `C(X, Y)`. Co-authored-by: @RemyDegenne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology brownian t-measure-probability	256/0	Mathlib.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/ContinuousMap.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Separation/Regular.lean	6	27	['ADedecker', 'EtienneC30', 'felixpernegger', 'github-actions', 'mathlib-merge-conflicts']	nobody	13-72872 13 days ago	13-72912 13 days ago	53-68255 53 days
38951	thomaskwaring author:thomaskwaring	feat(Order/PrimeSeparator): remove unnecessary hypotheses	In `mem_ideal_sup_principal`, boundedness and distributivity were unused, and in `prime_ideal_of_disjoint_filter_ideal`, boundedness was only used to produce an element of the filter `F`, which is already nonempty by definition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	9/19	Mathlib/Order/PrimeSeparator.lean	1	2	['github-actions']	nobody	13-71450 13 days ago	13-71537 13 days ago	13-71530 13 days
37854	JovanGerb author:JovanGerb	chore(FieldTheory/SplittingField/Construction): don't expose the construction	This PR removes `@[expose] public section` from the implementation of `SplittingField`, so that none of the constants with "aux" in the name are exported. Additionally, remove some defeq abuse. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	62/26	Mathlib/FieldTheory/SplittingField/Construction.lean,MathlibTest/instance_diamonds/FieldTheory/SplittingField/Construction.lean	2	3	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	13-70223 13 days ago	38-61309 38 days ago	0-1873 31 minutes
38780	yuanyi-350 author:yuanyi-350	chore(Catalogue PR): kill some `erw`s by adding rfl lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	55/29	Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/UniformSpace/Matrix.lean	8	2	['github-actions', 'mathlib-merge-conflicts']	nobody	13-70200 13 days ago	16-62758 16 days ago	0-1169 19 minutes
38953	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): The sheaf of modules associated to a Weil divisor	In this PR, we construct the sheaf of modules associated to a Weil divisor. Funnily enough, the definition does not actually require that the cycle is a Weil divisor, so in fact we construct a sheaf of modules associated to an arbitrary algebraic cycle. This isn't a particularly interesting definition outside of the case where the cycle is a Weil divisor as far as I can tell, but still I thought that was interesting. - [ ] depends on: #38472 - [ ] depends on: #35868 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import blocked-by-other-PR	1362/0	Mathlib.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Basic.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Principal.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Sheaf.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Minimal.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean,Mathlib/Topology/Sober.lean	13	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	13-68011 13 days ago	13-70219 13 days ago	0-12 12 seconds
36896	PieterCuijpers author:PieterCuijpers	feat (Algebra/Order/Quantale): isMulLeftsided, isMulRightsided, isMulTwosided and strict versions	* Adding definitions of quantale elements being leftsided, rightsided, and twosided, and strict versions Should we include these definitions in the main Algebra/Order/Quantale.lean file, or start a separate file for them? I have a few basic theorems I would like to include on these notions, but invite suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	81/1	Mathlib/Algebra/Order/Quantale.lean	1	5	['NoahW314', 'PieterCuijpers', 'chrisflav', 'github-actions']	mariainesdff assignee:mariainesdff	13-55260 13 days ago	20-47515 20 days ago	39-18222 39 days
38669	dannyply author:dannyply	feat(Topology/Algebra/PontryaginDual): prove compact monoids have discrete duals	Proves that the Pontryagin dual of a compact monoid is discrete. As a consequence, it also adds the corresponding finite-type instances for compact discrete monoids. This upstreams a result first added downstream in [`YaelDillies/APAP`](https://github.com/YaelDillies/APAP), where this fact was needed to close a `sorry`. The proof separates the trivial character from all the others using the right half of the circle and adds a few reusable `Circle` helper lemmas near the existing related API. The original APAP proof was AI-assisted and then reviewed/rewritten during downstream review. For this PR, I used Codex to help adapt the APAP proof to mathlib and to refactor the supporting lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author	130/16	Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/PontryaginDual.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	27	['dannyply', 'github-actions', 'j-loreaux', 'tb65536']	j-loreaux assignee:j-loreaux	13-40345 13 days ago	19-41247 19 days ago	0-75079 20 hours
37446	artie2000 author:artie2000	refactor(Algebra): uniform API for substructures	* Add class for `SetLike` instances whose map preserves meets - the intended interpretation is substructures whose closure properties are preserved under intersection * Abstract out the `CompleteLattice` instance and `closure` adjunction on such instances This change unifies a significant part of the API for algebraic substructures. --- - [x] depends on #32984 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Original PR: https://github.com/leanprover-community/mathlib4/pull/25963	t-data WIP merge-conflict	721/184	Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/MulOpposite.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Data/SetLike/Lattice.lean,Mathlib/GroupTheory/Subsemigroup/Centralizer.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/Tactic/MkClosureLemmas.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean	16	8	['artie2000', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	13-32715 13 days ago	48-19007 48 days ago	0-3200 53 minutes
36686	euprunin author:euprunin	chore: golf using `grind`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `List.prod_map_ite`: unchanged 🎉 * `Path.Homotopy.trans_assoc_reparam`: 2938 ms before, 717 ms after 🎉 * `SimplexCategory.δ_comp_δ`: 522 ms before, 316 ms after 🎉 * `Finsupp.ext_iff'`: unchanged 🎉 * `Computation.bind_assoc`: unchanged 🎉 * `Set.piecewise_insert`: unchanged 🎉 * `ZMod.valMinAbs_mem_Ioc`: unchanged 🎉 * `Matrix.det_eq_of_forall_row_eq_smul_add_pred_aux`: 2141 ms before, 2004 ms after 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	11/50	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Piecewise.lean,Mathlib/Data/ZMod/ValMinAbs.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean	8	14	['artie2000', 'chenson2018', 'dagurtomas', 'euprunin', 'github-actions', 'mathlib-merge-conflicts', 'ooovi']	dagurtomas assignee:dagurtomas	13-31369 13 days ago	13-31372 13 days ago	49-23305 49 days
38973	hyeoniuwu author:hyeoniuwu	feat(Computability): define (single oracle) turing reducibility, relate it to RecursiveIn and prove basic jump theorems	feat(Computability): define (single oracle) Turing reducibility, relate it to RecursiveIn and prove basic jump theorems Defines Turing reducibility and the jump operator, with total functions (from naturals to naturals) as oracles. Defines codes for basic primitive recursive functions, and the evaluation function. Proves basic reducibility arguments, such as `K0_eq_K` asserting that K0 of an oracle is Turing equivalent to K of an oracle. Our reducibility is related back to `RecursiveIn` as is currently defined in Mathlib via the theorem `SingleReducibleIff`. This is part of a larger repository where more advanced theorems such as KP54 have been proven. (https://github.com/hyeoniuwu/CiL) Co-authored-by: Tanner Duve --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-author	4988/0	Mathlib/Computability/SingleOracle/Basic.lean,Mathlib/Computability/SingleOracle/Constructions/Basic.lean,Mathlib/Computability/SingleOracle/Constructions/CovRec.lean,Mathlib/Computability/SingleOracle/Constructions/Dovetail.lean,Mathlib/Computability/SingleOracle/Constructions/Eval.lean,Mathlib/Computability/SingleOracle/Constructions/Eval_Aux.lean,Mathlib/Computability/SingleOracle/Constructions/List.lean,Mathlib/Computability/SingleOracle/Constructions/Meta.lean,Mathlib/Computability/SingleOracle/Constructions/Option.lean,Mathlib/Computability/SingleOracle/Constructions/Primitive.lean,Mathlib/Computability/SingleOracle/Encoding.lean,Mathlib/Computability/SingleOracle/Jump.lean,Mathlib/Computability/SingleOracle/Oracle.lean,Mathlib/Computability/SingleOracle/Order.lean,Mathlib/Computability/SingleOracle/RecursiveIn.lean,Mathlib/Computability/SingleOracle/Reducibilities.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Tactic/Attr/Register.lean,Mathlib/Tactic/Computability/Basic.lean	19	3	['github-actions', 'grunweg']	nobody	13-26592 13 days ago	unknown	0-0 0 seconds
38942	euprunin author:euprunin	chore: golf using `grind` and `simp`	The goal of this PR is to decrease the number of times lemmas are called explicitly. Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (differences <30 ms considered measurement noise): * `CategoryTheory.Abelian.SpectralObject.isZero_H_obj_of_isIso`: 73 ms before, <30 ms after 🎉 * `MvPolynomial.eval₂_uniqueAlgEquiv`: unchanged 🎉 * `Graph.restrict_restrict`: unchanged 🎉 * `SimpleGraph.edge_le_iff`: 86 ms before, 45 ms after 🎉 * `DFinsupp.induction`: unchanged 🎉 * `Finset.Nat.antidiagonal.snd_lt`: unchanged 🎉 * `List.prefix_append_drop`: unchanged 🎉 * `List.pairwise_of_reflexive_of_forall_ne`: unchanged 🎉 * `Relation.reflTransGen_iff_eq_or_transGen`: unchanged 🎉 Profiled using `set_option trace.profiler true in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	9/52	Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Combinatorics/Graph/Delete.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Finset/NatAntidiagonal.lean,Mathlib/Data/List/Infix.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Logic/Relation.lean	9	2	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	13-26471 13 days ago	13-26471 13 days ago	0-83701 23 hours
37456	Robertboy18 author:Robertboy18	feat(LinearAlgebra/AffineSpace): add parallel form of Desargues's theorem	This PR adds an affine parallel form of Desargues's theorem, corresponding to entry `87` of the Lean community “100 theorems” list and following the related Rocq/Coq affine-geometry statement. Main changes - New file `Mathlib/LinearAlgebra/AffineSpace/Desargues.lean` with `parallel_third_side_of_perspective`. - Add the corresponding `public import` to `Mathlib.lean`. - Update `docs/100.yaml` entry `87` with a note that this is the parallel affine form. Proof idea The proof compares side vectors using `exists_eq_smul_of_parallel` for the two given pairs of parallel sides. The shared comparison along `SA` forces the same scalar, which gives parallelism of the third pair of sides. Tests: `lake build Mathlib.LinearAlgebra.AffineSpace.Desargues` AI disclosure: GPT-5.2 Pro was used for assistance with web search/background details about the theorem and for finding useful existing Mathlib lemmas. The theorem statement and Lean formalization were written and checked by hand. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author LLM-generated label:t-algebra$	133/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Desargues.lean	2	17	['Robertboy18', 'SnirBroshi', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	13-23230 13 days ago	39-51378 39 days ago	8-72313 8 days
38667	SnirBroshi author:SnirBroshi	feat(Order/Hom/Basic): equivalences of `Order{Hom/Embedding/Iso}`	- `OrderHom`s are equivalent to `RelHom`s of `LE` (unlike `OrderEmbedding`/`OrderIso` they aren't defined using it) - Congruence equivs for `OrderEmbedding`/`OrderIso` when the two sides are order-isomorphic. This already exists for `OrderHom`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	55/1	Mathlib/Order/Hom/Basic.lean	1	3	['SnirBroshi', 'dagurtomas', 'github-actions']	nobody	13-22100 13 days ago	13-22100 13 days ago	20-19614 20 days
38792	openendings author:openendings	wip, chore: rename Directed -> Predirected [please-adopt]	This incomplete PR renames `Directed` to `Predirected`. As [discussed in Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20complete.20partial.20order.20and.20domain.20theory.20formalization/near/592156927), `Directed` misleadingly mismatches the literature. (The literature says a directed set is nonempty, and we do not.) #### f19d3e79 Rename Directed -> Predirected (class + namespace) Automated changes: - LSP code action renaming `Directed` to `Predirected` - with the affected 69 files open in [lean.nvim](https://github.com/julian/lean.nvim), a series of commands roughly equivalent to ```nvim :bufdo :silent %s/$theorem \\|lemma \\|to_dual $Directed\>/\1Predirected/ge :bufdo :silent %s/\\./Predirected./ge :bufdo :w ``` EDIT: manual changes - one `namespace Directed` replaced. ### Corners cut: - line-length linting has not been resolved. - no snake-cased `directed` has been renamed. - only tested via `lake build --old`, plus maybe ten minutes of `lake build` before I (@openendings ) got bored and wanted my CPU back. --- WIP please-adopt t-order [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt new-contributor WIP merge-conflict	196/195	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Subsemigroup/Membership.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/Data/Finset/Order.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Lattice/Image.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Sub.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/ModelTheory/Satisfiability.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/ModelTheory/Syntax.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/CompletePartialOrder.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Directed.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Independence/Kernel/Indep.lean,Mathlib/Probability/Independence/ZeroOne.lean,Mathlib/Probability/Kernel/Disintegration/CDFToKernel.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Category/TopCat/Limits/Konig.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/CompactSystem.lean,Mathlib/Topology/Compactness/CountablyCompact.lean,Mathlib/Topology/Semicontinuity/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/Separation/Profinite.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	69	7	['github-actions', 'kbuzzard', 'mathlib-merge-conflicts', 'openendings']	nobody	13-18619 13 days ago	unknown	0-0 0 seconds
38868	JovanGerb author:JovanGerb	feat(GRewrite): strict rewriting	This PR is a follow-up to #38318, and implements strict rewriting. Implementation note: The `gcongr` and `grw` tactics need to look up slightly differently in the `@[gcongr]` environment extension, because `gcongr` knows the constant on both sides of the relation, and `grw` only knows one. It would be possible to have two separate maps in the environment for these two use cases. However, I have implemented it with just a single map in the environment, as I think this is more efficient. Note: `lt_of_lt_of_le` and `lt_of_lt_of_le'` are tagged with `gcongr` after `ge_imp_ge_of_le_of_le` and `gt_imp_gt_of_le_of_le` so that they are tried first in `grw`. As a result, strict rewriting is done instead of the old behaviour whenever possible. TODO: tag a few more lemmas with `gcongr strict`. TODO: fix test and add more tests TODO: document `gcongr strict` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	725/302	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Ring/GeomSum.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Analysis/CStarAlgebra/Extreme.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Analysis/Convex/StrictCombination.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Combinatorics/Graph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsolutelyContinuousFun.lean,Mathlib/Order/Basic.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Independence.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Tactic/GRewrite/Core.lean,Mathlib/Tactic/GRewrite/Elab.lean,Mathlib/Topology/MetricSpace/ThickenedIndicator.lean,MathlibTest/GCongr/GCongr.lean,MathlibTest/GCongr/implications.lean,MathlibTest/GRewrite.lean	26	3	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	13-18616 13 days ago	15-63014 15 days ago	0-507 8 minutes
38975	ldct author:ldct	feat(EReal): Add equations for EReal	Add equational lemmas for the simplifier to simplify `[natural number literal] + ⊤` in `EReal`, and add a test file in `MathlibTest/EReal.lean`. Without these lemmas, `simp` fails to close many of the goals in `MathlibTest/EReal.lean`. I believe simp should close all of them. An alternative is to add something like this as a simp lemma, to allow `top_add_of_ne_bot` to make progress, but it's not clear to me that this is desirable as a simp lemma, since it's not equational ``` example {n : ℕ} [n.AtLeastTwo] : (ofNat(n) : EReal) ≠ ⊤ := by exact Ne.symm (not_eq_of_beq_eq_false rfl) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	32/0	Mathlib/Data/EReal/Operations.lean,MathlibTest/EReal.lean	2	2	['github-actions', 'vihdzp']	nobody	13-17867 13 days ago	13-20855 13 days ago	13-20848 13 days
38977	eric-wieser author:eric-wieser	feat: DFinsupp.mapDomain	The API for `DFinsupp.mapDomain` is copied from `Finsupp.mapDomain`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	271/0	Mathlib.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/BigOperators.lean	3	1	['github-actions']	nobody	13-16761 13 days ago	unknown	0-0 0 seconds
38231	NoneMore author:NoneMore	feat(ModelTheory/Definablity): add syntax-to-definability bridge lemmas	Add bridge lemmas from syntax to definability and refactor downstream proofs to use them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	88/56	Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/ElementarySubstructures.lean	2	1	['github-actions']	fpvandoorn assignee:fpvandoorn	13-12980 13 days ago	29-84754 29 days ago	29-84747 29 days
38778	felixpernegger author:felixpernegger	feat(Topology/EMetricSpace): instances of weak extended metric spaces	Continuation of #38105. In particular, this makes `ENNReal` and `EReal` weak extended metric spaces. After this PR one can probably generalise various results/definition which use `(Pseudo)EMetricSpace` to use `Weak(Pseudo)EMetricSpace` (so that they in particular also hold for `ENNReal` and `EReal`)	t-topology	247/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/Weak.lean	2	1	['github-actions']	PatrickMassot assignee:PatrickMassot	13-12975 13 days ago	14-10879 14 days ago	14-11826 14 days
38815	dagurtomas author:dagurtomas	feat(Tactic/CategoryTheory): extend `@[to_app]` to natural transformations	This extends the `@[to_app]` attribute so it also generates componentwise lemmas from equalities of natural transformations between functors, while preserving the existing bicategory behavior. It also ensures generated component lemmas remain usable by dsimp when they are definitionally true.	t-category-theory LLM-generated t-meta	148/22	Mathlib/Tactic/CategoryTheory/ToApp.lean,Mathlib/Util/AddRelatedDecl.lean,MathlibTest/CategoryTheory/ToApp.lean	3	1	['github-actions']	kim-em assignee:kim-em	13-12974 13 days ago	17-39169 17 days ago	17-39216 17 days
37546	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph): add module deprecations for #36819 #36854 #37525 #37544 #38349	--- - [x] depends on: #37544 - [ ] depends on: #38349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	689/611	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkCounting.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/EdgeLabeling.lean,Mathlib/Combinatorics/SimpleGraph/Partition.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Counting.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Subwalks.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Traversal.lean	20	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	13-11422 13 days ago	27-13884 27 days ago	0-29887 8 hours
38980	thorimur author:thorimur	bench: `haveI'` -> `have`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		131/131	Mathlib/Algebra/Order/Field/Power.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/Tactic/ModCases.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/NormNum/BigOperators.lean,Mathlib/Tactic/NormNum/DivMod.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/LegendreSymbol.lean,Mathlib/Tactic/NormNum/OfScientific.lean,Mathlib/Tactic/NormNum/Ordinal.lean,Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/ReduceModChar.lean	18	4	['eric-wieser', 'github-actions', 'leanprover-radar', 'thorimur']	nobody	12-80511 12 days ago	unknown	0-0 0 seconds
38009	CBirkbeck author:CBirkbeck	feat(RingTheory/Valuation): define the valuation spectrum and its topology	## Summary Define the valuation spectrum `Spv A` of a commutative ring and equip it with the topology generated by basic open sets, following Wedhorn's Adic Spaces. Also define the pullback (`comap`) of a `ValuativeRel` along a ring homomorphism. This is preparation for later defining adic spaces. Note the code was generated by claude code, but I have cleaned up and pre-reviewed the work.	t-ring-theory LLM-generated	362/0	Mathlib.lean,Mathlib/RingTheory/Valuation/ValuationSpectrum.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Comap.lean	3	40	['CBirkbeck', 'adamtopaz', 'chrisflav', 'dagurtomas', 'faenuccio', 'github-actions', 'jjdishere', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	12-78511 12 days ago	34-60428 34 days ago	34-60574 34 days
38922	yuanyi-350 author:yuanyi-350	chore(CategoryTheory/Triangulated/Pretriangulated): remove an erw	- rewrites the `isIso₂_of_isIso₁₃` proof by using `Triangle.invRotate_mor₂` directly in the rewrite chain - shortens `productTriangle_distinguished` by rewriting `productTriangle.π_hom₃` explicitly instead of using `erw` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-category-theory awaiting-author	5/4	Mathlib/CategoryTheory/Triangulated/Pretriangulated.lean	1	3	['github-actions', 'joelriou']	nobody	12-77680 12 days ago	14-43787 14 days ago	0-20200 5 hours
38272	yuanyi-350 author:yuanyi-350	refactor(Analysis): add `toSpanSingleton` isometry API	- adds the `toSpanSingleton` linear isometry API (`toSpanSingletonLIE` / `toSpanSingletonₗᵢ`) together with basic supporting simp lemmas - moves this API under the existing `toSpanSingleton` naming scheme, and deprecates `ring_lmap_equiv_selfₗ` / `ring_lmap_equiv_self`, since these are just the corresponding `toSpanSingleton` maps under the old naming or as the symmetry of an existing definition - updates one downstream use to the new API Extracted from #37968 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis LLM-generated codex awaiting-author	26/21	Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/Normed/Operator/Mul.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	3	17	['github-actions', 'themathqueen', 'yuanyi-350']	j-loreaux assignee:j-loreaux	12-77445 12 days ago	24-49592 24 days ago	1-45886 1 day
38557	SnirBroshi author:SnirBroshi	feat(Order/Monotone/Defs): weaken `Preorder` to `LE`/`LT`	`Monotone`/`Antitone`/`MonotoneOn`/`AntitoneOn` can use any `LE`, and `StrictMono`/`StrictAnti`/`StrictMonoOn`/`StrictAntiOn` can use any `LT`. This makes it necessary to add some explicit type params (e.g. `(α := α)`) in some places that use monotone-related theorems (e.g. `Function.monotone_eval`). --- Currently `OrderEmbedding` and `OrderIso` can use `LE` but `OrderHom` requires `Preorder` because it's defined using `Monotone`. Generalizing `Monotone` and friends will let us fix this oddity. This follows other basic definitions such as `IsMax`/`CovBy`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	21/15	Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Order/Interval/Lex.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/Topology/Order/MonotoneConvergence.lean	7	2	['JovanGerb', 'github-actions']	nobody	12-70697 12 days ago	22-14298 22 days ago	22-17122 22 days
38357	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Coloring/Greedy): Greedy coloring	--- Dependencies are included as sorried theorems to make the diff saner, but exist in the dependent PRs in full. - [ ] depends on: #35619 - [x] depends on: #35622 - [x] depends on: #35628 - [ ] depends on: #36626 - [ ] depends on: #38422 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics large-import blocked-by-other-PR	309/1	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Greedy.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	12-66395 12 days ago	26-85892 26 days ago	0-3012 50 minutes
38561	mcdoll author:mcdoll	feat: use `Is*Apply` classes for continuous linear maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	912/416	Mathlib.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Darboux.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Harmonic/Analytic.lean,Mathlib/Analysis/Convex/Birkhoff.lean,Mathlib/Analysis/Convex/DoublyStochasticMatrix.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Deriv.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/ConformalLinearMap.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/InnerProductSpace/Reproducing.lean,Mathlib/Analysis/InnerProductSpace/StarOrder.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Normed/Algebra/GelfandFormula.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Module/Alternating/Uncurry/Fin.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Analysis/Normed/Operator/Bilinear.lean,Mathlib/Analysis/Normed/Operator/Compact.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/Normed/Operator/Mul.lean,Mathlib/Analysis/Normed/Unbundled/FiniteExtension.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Data/FunLike/Group.lean,Mathlib/Data/FunLike/IsApply.lean,Mathlib/Data/FunLike/Module.lean,Mathlib/Data/FunLike/MonoidWithZero.lean,Mathlib/Data/FunLike/Ring.lean,Mathlib/Data/Matrix/PEquiv.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/ContinuousLinearMap.lean,Mathlib/LinearAlgebra/Matrix/Polynomial.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/JacobianOneDim.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Group/Prod.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean,Mathlib/MeasureTheory/Measure/Haar/MulEquivHaarChar.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Hahn.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/Jordan.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/SiegelsLemma.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Moments/Variance.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	101	4	['Vierkantor', 'github-actions', 'mathlib-merge-conflicts']	nobody	12-65978 12 days ago	unknown	0-0 0 seconds
38037	linesthatinterlace author:linesthatinterlace	feat: extend `LawfulXor` lemmas and add `Equiv.xor`	This PR extends the work of #37712 by adding additional lemmas and adding `xor-as-a-permutation`. --- - [ ] depends on: #37712 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data blocked-by-other-PR	270/0	Mathlib.lean,Mathlib/Data/Fin/Init.lean,Mathlib/Data/LawfulXor/Basic.lean,Mathlib/Data/LawfulXor/Equiv.lean	4	4	['github-actions', 'linesthatinterlace', 'mathlib-dependent-issues']	linesthatinterlace assignee:linesthatinterlace	12-65876 12 days ago	12-65877 12 days ago	21-80359 21 days
37310	CoolRmal author:CoolRmal	feat(MeasureTheory): uniformly distributed outer regular measures in a second countable pseudometric space are unique up to a finite constant	In this PR we define uniformly distributed measures and prove [Christensen's Lemma](https://en.wikipedia.org/wiki/Spherical_measure), which says that uniformly distributed outer regular measures in a second countable pseudometric space are unique up to a finite constant. A classical application of Christensen's Lemma is to show that the restriction of the `n - 1`-dimensional Hausdorff measure onto an `n`-dimensional sphere coincides with the spherical measure. This will be done in another PR. --- - [x] depends on: #37311 - [x] depends on: #37312 - [x] depends on: #37313 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	201/1	Mathlib.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/UniformlyDistributed.lean,Mathlib/Order/LiminfLimsup.lean	4	17	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'wwylele']	RemyDegenne assignee:RemyDegenne	12-57996 12 days ago	14-14710 14 days ago	17-44999 17 days
38960	ajhendel author:ajhendel	chore: remove ℕ+ interval_cases workaround in ADEInequality	`interval_cases` now supports `ℕ+`, so the manual `Finset.mem_Iio`/`Finset.mem_Ico` + `conv` + `fin_cases` workaround (marked with a porting note) is no longer needed. Replaces three 3-4 line workaround blocks with `interval_cases p`/`q`/`r`.	t-number-theory new-contributor awaiting-CI	3/10	Mathlib/NumberTheory/ADEInequality.lean	1	2	['github-actions']	nobody	12-57811 12 days ago	13-58743 13 days ago	0-105 1 minute
38989	grunweg author:grunweg	chore: remove `(d)simp only []`	Either remove them (when they were unnecessary), or replace by something more low-level. --- I'm happy to make them `simp only` instead, if that is preferred. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		10/17	Counterexamples/AharoniKorman.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/RE.lean,Mathlib/Computability/TuringMachine/Config.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/ModelTheory/Encoding.lean	11	4	['b-mehta', 'github-actions', 'grunweg']	nobody	12-57539 12 days ago	12-72807 12 days ago	12-72800 12 days
38979	ldct author:ldct	feat(EReal): simplify nat + ⊤	Alternative version of https://github.com/leanprover-community/mathlib4/pull/38975 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	28/2	Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Operations.lean,MathlibTest/EReal.lean	3	6	['SnirBroshi', 'eric-wieser', 'github-actions', 'ldct', 'leanprover-radar']	nobody	12-52382 12 days ago	12-52148 12 days ago	12-52271 12 days
37955	artie2000 author:artie2000	feat(Algebra/Polynomial): lemmas about `modByMonic`	* Add various small lemmas about `Polynomial.modByMonic` * Remove unneccesary commutativity assumption on `Polynomial.aeval_eq_zero_of_dvd_aeval_eq_zero` by proving `Polynomial.aeval_dvd` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	20/6	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean	5	4	['github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	12-29937 12 days ago	12-29937 12 days ago	24-18920 24 days
38136	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): add definitional equivalence with generating set given by `S : Set G`.	A group `G` is finitely presented if and only if it admits a finite generating set given by `S : Set G` such that the canonical inclusion map is surjective and the kernel is finitely generated as a normal subgroup. --- Co-pilot + Gemini Pro 3.1 was used for assistance. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	40/0	Mathlib/GroupTheory/FinitelyPresentedGroup.lean	1	7	['copilot-pull-request-reviewer', 'github-actions', 'homeowmorphism', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	12-15958 12 days ago	32-22054 32 days ago	0-17 17 seconds
37718	SabrinaJewson author:SabrinaJewson	feat(Order): add conversions from `Std` order typeclasses to Mathlib ones	`{Preorder, PartialOrder, LinearOrder}.ofStd` exist to facilitate convenient translation from `Std` order typeclasses to Mathlib ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	366/0	Mathlib.lean,Mathlib/Order/Std.lean,MathlibTest/OrderOfStd.lean	3	2	['github-actions']	nobody	12-13670 12 days ago	42-16581 42 days ago	42-17067 42 days
38885	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/LpOrder`	- rewrites `coeFn_nonneg` to use the `Lp.coeFn_zero` eventual equality directly via `trans_le`, instead of a separate `filter_upwards` proof Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	1/4	Mathlib/MeasureTheory/Function/LpOrder.lean	1	2	['github-actions', 'yuanyi-350']	RemyDegenne assignee:RemyDegenne	12-12763 12 days ago	15-53012 15 days ago	15-53005 15 days
38886	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/SimpleFuncDenseLp`	- rewrites `measure_preimage_lt_top_of_memLp` via `FinMeasSupp.of_lintegral_ne_top` and `FinMeasSupp.map_iff`, instead of expanding `eLpNorm'` and splitting through `ENNReal.mul_lt_top_iff` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	9/21	Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean	1	2	['github-actions', 'yuanyi-350']	RemyDegenne assignee:RemyDegenne	12-12762 12 days ago	15-52804 15 days ago	15-52797 15 days
39004	zhuyizheng author:zhuyizheng	chore(ModelTheory): fix hypo of `realize_liftAt`	changes the hypo of `realize_liftAt` from the incorrect `(hmn : m + n' ≤ n + 1)` to the correct `(hmn : m ≤ n)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	2/2	Mathlib/ModelTheory/Semantics.lean	1	3	['github-actions', 'plp127', 'zhuyizheng']	nobody	12-12611 12 days ago	12-48740 12 days ago	12-48733 12 days
38310	ZRTMRH author:ZRTMRH	feat(Combinatorics/Quiver/Schreier): word evaluation and reachability	Adds word evaluation and reachability results to the Schreier graph API. * `SchreierGraph.evalWord` : evaluates a word `List (S × Bool)` as an element of the ambient group, where `(s, true)` contributes `ι s` and `(s, false)` contributes `(ι s)⁻¹`. * `SchreierGraph.evalWord_eq_lift` : agreement with `FreeGroup.lift`. * `SchreierGraph.evalWord_mem_closure` : every word evaluates into the subgroup generated by `ι`. * `SchreierGraph.pathFromWord` : a Bool-tagged word yields a path in `Symmetrify (SchreierGraph V ι)` from `x` to `evalWord ι w • x`. * `SchreierGraph.reachable_iff` : two vertices are connected by a path in the symmetrification iff some element of the subgroup closure carries one to the other. Follow-up to #36320. This PR was written with AI assistance (Claude). The code has been reviewed by the author. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics large-import LLM-generated	157/0	Mathlib/Combinatorics/Quiver/Schreier.lean	1	2	['github-actions']	nobody	11-85465 11 days ago	28-32539 28 days ago	28-32532 28 days
38663	vihdzp author:vihdzp	chore: deprecate duplicate theorems about `IsBotZeroClass`	I'll probably split this into various PRs, for ease of review. --- - [x] depends on: #38148 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	210/270	Archive/Imo/Imo2024Q3.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/IsBotOne.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Reduction.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Operator/NNNorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Analysis/SpecialFunctions/ArithmeticGeometricMean.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/Extremal/RuzsaSzemeredi.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Equitabilise.lean,Mathlib/Combinatorics/SimpleGraph/VertexCover.lean,Mathlib/Computability/Primrec/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/List/Shortlex.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/Finite/Valuation.lean,Mathlib/FieldTheory/RatFunc/Valuation.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/KleinFour.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/Function/SimpleFuncDense.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Measure/Map.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/NumberTheory/ArithmeticFunction/Moebius.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Probability/Kernel/IonescuTulcea/Traj.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Polynomial/Resultant/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/Topology/Algebra/InfiniteSum/ENNReal.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Polynomial.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/MetricSpace/Pseudo/Constructions.lean	92	4	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	11-83517 11 days ago	19-41258 19 days ago	0-762 12 minutes
38873	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Constructions/BorelSpace/Real`	- rewrites `measurable_const_mul` by splitting off the `c = 0` case and proving the nonzero case via `measurable_of_continuousOn_compl_singleton` - replaces the ad hoc case analysis on `⊥`, `⊤`, and real coefficients with a direct continuity argument for multiplication on `EReal` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	5/19	Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean	1	3	['LorenzoLuccioli', 'github-actions', 'yuanyi-350']	kex-y assignee:kex-y	11-83275 11 days ago	12-16185 12 days ago	15-27287 15 days
39023	TBUGTB author:TBUGTB	feat(Algebra/Order): API lemmas on floor and abs	Co-authored-by: Etienne Marion @EtienneC30 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra brownian new-contributor label:t-algebra$	9/0	Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Ring/Abs.lean	2	3	['TBUGTB', 'github-actions']	nobody	11-67191 11 days ago	11-70380 11 days ago	11-70373 11 days
39029	felixpernegger author:felixpernegger	chore: remove redundant `unfold`s	This PR removed roughly (estimated by files I went through) half of the `unfold`'s in mathlib which can be removed such that the proof still works (found by searching `unfold ` in VSCode in manually going through ~600/1100 occurences). I originally planned to replace all, but I couldn't find any relevant discussion if this is actually a good practice, so to save potentially wasted time, I make this PR now. (similarly with the `clear` tactic) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		63/108	Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Orthogonality.lean,Mathlib/CategoryTheory/Functor/Flat.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Graph/Delete.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TuringMachine/PostTuringMachine.lean,Mathlib/Computability/TuringMachine/StackTuringMachine.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/List/Intervals.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Nat/Digits/Div.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Prime.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Seq/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Data/ZMod/Basic.lean	44	3	['felixpernegger', 'github-actions', 'leanprover-radar']	nobody	11-60310 11 days ago	11-64897 11 days ago	11-64890 11 days
36963	seewoo5 author:seewoo5	feat(ModularForms): SL2 action and Serre derivative	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Equivariance of Serre derivative under SL2 action. More precisely, $$\partial_k (F\|_k \gamma) = (\partial_{k} F)\|_{k+2} \gamma$$. From [Sphere Packing Project](https://github.com/thefundamentaltheor3m/Sphere-Packing-Lean).	t-number-theory large-import awaiting-author	164/1	Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/NumberTheory/ModularForms/Derivative.lean	2	10	['github-actions', 'loefflerd', 'seewoo5', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	11-58287 11 days ago	11-58287 11 days ago	22-11119 22 days
38702	jcommelin author:jcommelin	chore(Data/Real): encapsulate real numbers	This PR: * hides the definition of the real numbers * preserves defeqs when casting `Nat`, `Int`, `Rat`, into the reals * preserves the defeq `x - y = x + (-y)` for `x y : Real` * removes a bunch of technical debt * adjusts imports in the library, where files relied on getting access to Cauchy sequences transitively via importing the reals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	235/256	Archive/Imo/Imo2013Q5.lean,Counterexamples/SeminormLatticeNotDistrib.lean,Mathlib.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Real/Cauchy.lean,Mathlib/Data/Real/Sign.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Topology/Algebra/Ring/Real.lean,Mathlib/Topology/Instances/Real/Lemmas.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/UniformSpace/CompareReals.lean,Mathlib/Topology/UniformSpace/Real.lean,MathlibTest/Complex.lean,MathlibTest/Quaternion.lean,MathlibTest/Real.lean,MathlibTest/peel.lean	26	31	['JovanGerb', 'Kha', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'jcommelin', 'leanprover-radar', 'mathlib-bors', 'riccardobrasca', 'sgouezel', 'wkrozowski']	nobody	11-57554 11 days ago	19-59904 19 days ago	0-2637 43 minutes
38374	idontgetoutmuch author:idontgetoutmuch	Principal Bundles, Connection 1-forms and the Frame Bundle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor	2017/0	Mathlib/Geometry/Manifold/Algebra/FakeFormII.lean,Mathlib/Geometry/Manifold/Algebra/PrincipalGBundle.lean,Mathlib/Geometry/Manifold/Algebra/SmoothLieExp.lean	3	2	['github-actions']	nobody	11-56408 11 days ago	unknown	0-0 0 seconds
38781	JovanGerb author:JovanGerb	feat: instance diamond linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	111/4	Mathlib.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/InstanceDiamonds.lean	6	2	['github-actions', 'mathlib-bors']	nobody	11-51130 11 days ago	18-45709 18 days ago	0-12 12 seconds
38194	ryanncode author:ryanncode	feat(LinearAlgebra/BilinearForm): add indefinite metrics	Add the `IndefiniteMetric` structure to support vector spaces equipped with a non-degenerate, symmetric, indefinite bilinear form. Provide the algebraic foundation for indefinite inner product spaces by formalizing the metric via `LinearMap.BilinForm` and extracting its associated quadratic form without enforcing the `IsPosSemidef` typeclass. Previously, mathlib required strictly positive-definite metrics to instantiate inner product spaces (`InnerProductSpace`), which prevented the formalization of indefinite geometries without causing typeclass inference failures. Bridge this gap by isolating the symmetric bilinear form from topological and positivity constraints, allowing the library to handle generalized indefinite metric spaces safely. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-author label:t-algebra$	47/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/IndefiniteMetric.lean	2	4	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	nobody	11-48733 11 days ago	11-48733 11 days ago	15-56169 15 days
37023	xroblot author:xroblot	feat(NumberTheory/NumberField): linear disjointness from coprime discriminants	The key new result is `dvd_discr_iff_dvd_discr_normalClosure`: a prime `p` divides `discr K` if and only if it divides the discriminant of the normal closure of `K` over `ℚ`. Thanks to this result, we generalize `linearDisjoint_of_isGalois_isCoprime_discr` by removing the Galois hypothesis: if K₁ and K₂ are number fields with coprime discriminants, then they are linearly disjoint over ℚ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #36843 - [ ] depends on: #30666	merge-conflict blocked-by-other-PR	1575/57	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/TransferInstance.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IntermediateField/ExtendTop.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Ideal/Galois.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	24	1	['mathlib-dependent-issues']	nobody	11-35635 11 days ago	56-72884 56 days ago	0-83 1 minute
38867	jvanwinden author:jvanwinden	feat(Probability/Process/Adapted): add IsProgressive and basic API	This PR is a follow-up of #38254 and introduces a `Measurable` variant of `IsStronglyProgressive` with basic API. The statements of the lemmas are modeled after the corresponding lemma's for `Measurable`, and the proof is simply to apply them pointwise in `i`. I have refrained from adding too many basic lemma's, since it remains to be seen if `IsProgressive` will see extensive use. Zulip discussion at [#Brownian motion > Adapted Filtrations for Markov Chains and Markov Processes](https://leanprover.zulipchat.com/#narrow/channel/509433-Brownian-motion/topic/Adapted.20Filtrations.20for.20Markov.20Chains.20and.20Markov.20Processes/with/563702867) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	91/9	Mathlib/Probability/Process/Adapted.lean	1	3	['RemyDegenne', 'github-actions', 'jvanwinden']	kex-y assignee:kex-y	11-35245 11 days ago	15-65054 15 days ago	15-65181 15 days
38527	archiebrowne author:archiebrowne	feat(Analysis/Calculus): continuously differentiable actions	define the class `ContDiffSMul 𝕜 M X n` which asserts that the map `(c, x) ↦ c • x` is `n` times continuously differentiable on `M × X`. Many of the results are the C^n analogues of those in the module Mathlib.Topology.Algebra.MulAction.	t-differential-geometry new-contributor	317/24	Mathlib.lean,Mathlib/Analysis/Calculus/BumpFunction/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/ContDiffMulAction.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean	6	11	['archiebrowne', 'github-actions', 'grunweg', 'peabrainiac']	PatrickMassot and grunweg assignee:grunweg assignee:PatrickMassot	11-29452 11 days ago	11-29527 11 days ago	19-15429 19 days
38903	lua-vr author:lua-vr	feat(Covering/Vitali): add `exists_disjoint_subfamily_covering_enlargement_ball`	Adds the analogous version `exists_disjoint_subfamily_covering_enlargement_ball` of the Vitali covering theorem for open balls. For the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	37/0	Mathlib/MeasureTheory/Covering/Vitali.lean	1	2	['github-actions']	EtienneC30 assignee:EtienneC30	11-25587 11 days ago	14-75274 14 days ago	14-75267 14 days
37701	grunweg author:grunweg	debug: investigate error in #37688	--- Goal: figure out the bad error messages in #37688. This PR focuses on one such proof: adding grind as default gcongr discharger just locally already produces an error. `grind` cannot solve the first side goal; that is fine --- the error caused is not; that should be improved. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis merge-conflict	11/2	Mathlib/Analysis/Fourier/FourierTransformDeriv.lean	1	3	['github-actions', 'mathlib-merge-conflicts']	nobody	11-25376 11 days ago	42-46215 42 days ago	0-7 7 seconds
38901	thorimur author:thorimur	bench: null linters	This PR tries to determine the "flat fees" of linters are in benching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		12/0	Mathlib/Init.lean	1	7	['github-actions', 'leanprover-radar', 'thorimur']	nobody	11-18889 11 days ago	unknown	0-0 0 seconds
36756	Jun2M author:Jun2M	feat(Combinatorics/GraphLike/Walks): add general walks for `GraphLike` structures	Per discussion at ([#graph theory > HasAdj](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445)), This PR introduces the basic theory of walks as a general framework that works across different graph-like structures including `SimpleGraph`, `Digraph`, and `Graph`. ## Main definitions * `Walk G u v`: The type of walks from vertex `u` to vertex `v` in a graph-like structure `G` * `Walk.length`: The number of edges in a walk * `Walk.support`: The list of vertices visited by a walk * `Walk.darts`: The list of `darts` (oriented edges) in a walk --- - [ ] depends on: #36743 - [ ] depends on: #39047 - [ ] depends on: #36829 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	789/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/GraphLike/Symm.lean,Mathlib/Combinatorics/GraphLike/Walks/Basic.lean,Mathlib/Combinatorics/GraphLike/Walks/Simple.lean	5	4	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	11-18627 11 days ago	63-17727 63 days ago	0-547 9 minutes
39059	vihdzp author:vihdzp	feat: `IsBotOneClass (Associates M)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/9	Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/RingTheory/ChainOfDivisors.lean	2	1	['github-actions']	nobody	11-13770 11 days ago	11-13846 11 days ago	11-15865 11 days
38021	IvanRenison author:IvanRenison	feat(Data/Int/ModEq): add theorem `modEq_two_abs`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	4/0	Mathlib/Data/Int/ModEq.lean	1	1	['github-actions']	TwoFX assignee:TwoFX	11-12715 11 days ago	35-23022 35 days ago	35-23015 35 days
38198	JovanGerb author:JovanGerb	chore(Data/Real/Basic): `no_expose` the private operations	This PR puts `no_expose` on all of the operations on `Real` that are defined in terms of quotients. This is a step in the direction of not exposing the definiton of `Real`. Note that I leave the `irreducible_def`s as is. This is because the `simpNF` linter does not participate in the module system, and it would time out otherwise. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	11/32	Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	3	11	['JovanGerb', 'eric-wieser', 'github-actions', 'leanprover-radar']	TwoFX assignee:TwoFX	11-12712 11 days ago	30-70657 30 days ago	30-71591 30 days
38600	khwilson author:khwilson	feat(Topology/Semicontinuity): additional definitions for correspondences	On the way to proving Michael's selection theorem, several extra notions related to hemicontinuity are introduced. Specifically, the notion of a correspondence having lower sections and it having an open graph. The first construction is what is used in the proof of Michael's theorem to generate approximations to the target selection. The second is used in the iterative step to generate new lower hemicontinuous maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	349/0	Mathlib/Topology/Semicontinuity/Defs.lean	1	4	['github-actions', 'j-loreaux', 'khwilson']	j-loreaux assignee:j-loreaux	11-4925 11 days ago	14-32447 14 days ago	6-61285 6 days
38594	ScottCarnahan author:ScottCarnahan	feat(Algebra/Lie): grading on loop algebras	(WIP) put the canonical "energy" grading on a loop algebra. This will (eventually) give us the "energy" operator on smooth representations of a central extension. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	176/0	Mathlib/Algebra/Lie/Loop.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean	2	1	['github-actions']	nobody	11-4556 11 days ago	21-13147 21 days ago	0-21 21 seconds
39037	JovanGerb author:JovanGerb	chore: improve some instances	These instances were found to cause slow type class searches. This is needed to avoid timeouts in the instance diamonds linter. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI	11/5	Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean	5	3	['JovanGerb', 'github-actions', 'grunweg']	nobody	10-75596 10 days ago	11-50677 11 days ago	0-432 7 minutes
38970	themathqueen author:themathqueen	chore(Analysis/InnerProductSpace/Projection): rename `orthogonalProjection` to `orthogonalProjectionOnto`	To match the current (continuous) linear projection to a submodule along its complement `Submodule.projection(Onto)(L)`, we change `Submodule.orthogonalProjection` to `Submodule.orthogonalProjectionOnto` (and later will change `Submodule.starProjection` to `Submodule.orthogonalProjection`). --- Zulip thread: [#mathlib4>Two variants of linear projections](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Two.20variants.20of.20linear.20projections/with/591234152) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	267/183	Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Projection/Reflection.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/Topology/MetricSpace/HausdorffDimension.lean,docs/overview.yaml,docs/undergrad.yaml	20	16	['ADedecker', 'eric-wieser', 'github-actions', 'themathqueen']	mcdoll assignee:mcdoll	10-73512 10 days ago	10-73460 10 days ago	13-944 13 days
38228	kim-em author:kim-em	ci: block merging PRs that increase technical debt unless reviewed	This PR adds a merge gate for technical debt increases. When the existing technical debt metrics script reports an increase, the `build` job adds an `increases-technical-debt` label. A `check-technical-debt` job then adds `blocked-by-increases-technical-debt`, which blocks bors. A reviewer can add `allow-increases-technical-debt` to unblock after confirming the increase is acceptable. ### Fail-closed detection The detection greps for the safe patterns (`Decrease in tech debt:` / `No changes to technical debt.`) rather than for `Increase`. If `mathlib-ci` changes the script's output wording, the label is added (fail closed) rather than silently skipped (fail open). ### Labels (three-label pattern, same as #38225) \| Label \| Managed by \| Purpose \| \|---\|---\|---\| \| `increases-technical-debt` \| `build` job (tech debt script) \| Factual: this PR increases debt \| \| `blocked-by-increases-technical-debt` \| `check-technical-debt` job \| Operational: blocks bors \| \| `allow-increases-technical-debt` \| Reviewer \| Override: reviewer approves the increase \| Bors's `block_labels` has no conditional logic, so we need the derived `blocked-by-increases-technical-debt` label to express the conjunction "increases-technical-debt AND NOT allow-increases-technical-debt". False positives can be reported on the [mathlib4 Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/increases-technical-debt.20label). 🤖 Prepared with Claude Code ----------- - [x] depends on: leanprover-community/mathlib-ci#28	CI awaiting-author	76/2	.github/workflows/PR_summary.yml,bors.toml	2	8	['github-actions', 'grunweg', 'jcommelin', 'joneugster', 'kim-em', 'mathlib-dependent-issues']	Vierkantor and jcommelin assignee:Vierkantor assignee:jcommelin	10-73087 10 days ago	10-73087 10 days ago	12-75706 12 days
39048	AydenLamp author:AydenLamp	feat(Algebra/Group/Defs): add positive natural exponentiation for semigroups	Introduce exponentiation for semigroups with positive natural exponents. This serves as a foundation for future results on Green’s relations and Rees matrix constructions in semigroups. --- Co-authored-by: Howard Straubing Soleil Repple Nathan Hart-Hodgson [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	106/0	Mathlib.lean,Mathlib/Algebra/Group/SemigroupPow.lean	2	7	['ScottCarnahan', 'github-actions', 'wwylele']	nobody	10-70582 10 days ago	11-28153 11 days ago	0-115 1 minute
37415	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): compute limits of `Monomial`s	Prove * `UnitMonomial.logToFun_isEquivalent_of_nonzero_head`: `log m.toFun` is asymptotically equivalent to its first summand - `m[0] • log basis[0]` if `m[0] ≠ 0`. Using this theorem we can prove that the asymptotic behavior of a monomial is determined by its first non-zero exponent. * `toFun_tendsto_top_of_FirstNonzeroIsPos` and its variants: used to infer the limit of `t.toFun` from `FirstNonzeroIsPos`/`FirstNonzeroIsNeg`/`AllZero`. * `IsLittleO_of_lt_exps` and its variants: used to asymptotically compare two monomials. --- - [x] depends on: #37411 This is a part of the `compute_asymptotics` tactic (#28291). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	380/1	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Basic.lean	2	14	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	10-68830 10 days ago	10-68830 10 days ago	13-72357 13 days
39046	adamtopaz author:adamtopaz	feat: Fill three proof_wanted declarations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra awaiting-author label:t-algebra$	54/13	Mathlib/Data/EReal/Operations.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Trace.lean	3	4	['github-actions', 'themathqueen']	nobody	10-66613 10 days ago	11-35144 11 days ago	0-1 1 second
39041	themathqueen author:themathqueen	refactor(Analysis/InnerProductSpace/Projection): redefine `orthogonalProjectionOnto` via `projectionOntoL`	Now that we have `IsTopCompl` and `projectionOntoL`, we can define `orthogonalProjectionOnto` directly this way instead of needing an implementation definition. --- - [ ] depends on: #38970 Zulip thread: [#mathlib4 > refactoring `Submodule.orthogonalProjection`](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/refactoring.20.60Submodule.2EorthogonalProjection.60/with/593516136) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-analysis	339/288	Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Projection/Reflection.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/Topology/MetricSpace/HausdorffDimension.lean,docs/overview.yaml,docs/undergrad.yaml	22	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-65935 10 days ago	11-42914 11 days ago	0-1 1 second
38476	agusakov author:agusakov	refactor(Combinatorics/Digraph): add vertex sets	--- Adopting #33466 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	381/50	Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Digraph/Orientation.lean	2	16	['Shreyas4991', 'YaelDillies', 'agusakov', 'github-actions']	nobody	10-59926 10 days ago	19-78467 19 days ago	3-33232 3 days
39078	fpvandoorn author:fpvandoorn	feat: add lemmas about products over Finset.Iio	* Mostly useful for `ℕ` * I added the `Finset.Iic` lemmas by symmetry, but I'm happy to remove them if we think they are redundant. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/0	Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean	1	1	['github-actions']	nobody	10-57836 10 days ago	10-57916 10 days ago	10-57909 10 days
38671	dagurtomas author:dagurtomas	chore(CategoryTheory): start using `mk_concrete_category`	--- - [ ] depends on: #38587 - [x] depends on: #39005 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated blocked-by-other-PR	1125/1796	Mathlib.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CommAlgCat/Basic.lean,Mathlib/Algebra/Category/CommBialgCat.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp.lean,Mathlib/Order/Category/BddDistLat.lean,Mathlib/Order/Category/BddLat.lean,Mathlib/Order/Category/BddOrd.lean,Mathlib/Order/Category/BoolAlg.lean,Mathlib/Order/Category/DistLat.lean,Mathlib/Order/Category/FinBddDistLat.lean,Mathlib/Order/Category/Frm.lean,Mathlib/Order/Category/HeytAlg.lean,Mathlib/Order/Category/Lat.lean,Mathlib/Order/Category/LinOrd.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Category/PartOrdEmb.lean,Mathlib/Order/Category/Preord.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Rep/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/MkConcreteCategory.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Basic.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Category/UniformSpace.lean,MathlibTest/CategoryTheory/MkConcreteCategory.lean	37	9	['dagurtomas', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-48930 10 days ago	20-23532 20 days ago	0-1 1 second
39091	tb65536 author:tb65536	feat(FieldTheory/Galois/IsGaloisGroup): add version of `IsGaloisGroup.to_isFractionRing` assuming only `IsIntegral`	This PR adds a version of `IsGaloisGroup.to_isFractionRing` assuming only `Algebra.IsIntegral A B` (which is weaker than the existing assumption `Finite G`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	22/9	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/RingTheory/Invariant/Basic.lean	2	1	['github-actions']	nobody	10-44444 10 days ago	10-44444 10 days ago	10-44438 10 days
38637	FLDutchmann author:FLDutchmann	test(Tactic/Algebra): try to replace `ring` with algebra in many places	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	497/89	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/NNReal/Star.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/ENatENNReal.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/GroupTheory/Archimedean.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/LinearAlgebra/Basis/Submodule.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/RingTheory/Derivation/ToSquareZero.lean,Mathlib/RingTheory/Nilpotent/Exp.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Ring.lean,Mathlib/Tactic/Ring/Common.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/MetricSpace/Defs.lean,MathlibTest/Algebra.lean	45	16	['FLDutchmann', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	10-43007 10 days ago	unknown	0-0 0 seconds
39094	tb65536 author:tb65536	feat(FieldTheory/Galois/IsGaloisGroup): generalize finiteness of Galois groups from fields to rings	This PR generalizes finiteness of Galois groups from fields to rings. --- - [ ] depends on: #39091 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra blocked-by-other-PR label:t-algebra$	31/11	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/RingTheory/Invariant/Basic.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-41852 10 days ago	10-42722 10 days ago	0-2 2 seconds
38499	SnirBroshi author:SnirBroshi	feat(Order/Hom/Basic): `Relation.Map`/`Function.onFun` form an order isomorphism between `α`-relations and `β`-relations	For an injective function `f : α → β`, `Relation.Map · f f` is an order embedding from `α`-relations into `β`-relations. For a surjective function `f : α → β`, `Function.onFun · f` is an order embedding from `β`-relations into `α`-relations. For a bijective function `f : α → β`, `Relation.Map · f f` and `Function.onFun · f` form an order isomorphism between `α`-relations and `β`-relations. --- - [ ] depends on: #38432 TODO: generalize to `bicompl` after the dependency is merged [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	42/0	Mathlib/Order/Hom/Basic.lean	1	7	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'plp127', 'wwylele']	nobody	10-35905 10 days ago	19-76444 19 days ago	4-11004 4 days
39074	tb65536 author:tb65536	feat(RingTheory/RamificationInertia/Ramification): relate `ramificationIdx'` to `Algebra.IsUnramifiedAt`	This PR relates the new `ramificationIdx'` (which will eventually replace `ramificationIdx`) to `Algebra.IsUnramifiedAt`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra large-import label:t-algebra$	30/0	Mathlib/RingTheory/RamificationInertia/Ramification.lean	1	1	['github-actions']	nobody	10-34800 10 days ago	10-50456 10 days ago	10-50450 10 days
38223	Deicyde author:Deicyde	feat(Geometry/Manifold): add `MfldCat`, the category of `C^n` manifolds	We define `MfldCat 𝕜 n`: the category of `C^n` manifolds over a field `𝕜`, following the pattern of `TopCat` in `Mathlib.Topology.Category.TopCat.Basic`. We also implement `HasForget₂ (MfldCat 𝕜 n) TopCat`—the forgetful functor into the category of topological spaces. For more discussion see the Zulip thread: [#PR reviews > #38223 The Category of C^n Manifolds](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2338223.20The.20Category.20of.20C.5En.20Manifolds/with/587038032) Also added: `ContMDiffMap.id_apply`, `.coe_id` and `.coe_comp` which are comparable to `ContinuousMap` API. ### Future work - ✅ Define a Monoidal structure via product manifolds, analogous to `Manifold.Topology.Category.TopCat.Monoidal` #38560 - ✅ Define the tangent functor: `M ↦ TM`, `F ↦ F.tangentMap` from `MfldCat (n+1) 𝕜` to `MfldCat n 𝕜` #38270 - Functor `FGModuleCat 𝕜 ⥤ MfldCat 𝕜 n` sending a finite-dimensional `𝕜`-vector space to the manifold modeled on itself. Left as `TODO`. - Define `FGModuleCat 𝕜` as an enriched category over `MfldCat n 𝕜`. Then _smooth functors_ can be realized as endofunctors on the enriched category. This is the main motivation for this construction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry new-contributor t-category-theory	224/0	Mathlib.lean,Mathlib/Geometry/Manifold/Category/MfldCat/Basic.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean	3	57	['Deicyde', 'chrisflav', 'dagurtomas', 'github-actions', 'idontgetoutmuch', 'peabrainiac']	kim-em assignee:kim-em	10-28422 10 days ago	10-31846 10 days ago	23-81955 23 days
38864	xroblot author:xroblot	feat(IsGaloisGroup): add `restrictHom`	--- - [ ] depends on: #38902 - [ ] depends on: #38464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR merge-conflict	590/104	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	7	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-27238 10 days ago	15-71681 15 days ago	0-12 12 seconds
39071	scholzhannah author:scholzhannah	feat(Topology): add `PartialHomeomorph` as generalization of `OpenPartialHomeomorph`	As discussed on Zulip ([#mathlib4 > Generalizing `PartialHomeomorph`?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generalizing.20.60PartialHomeomorph.60.3F/with/536896273)), I renamed `PartialHomeomorph` to `OpenPartialHomeomorph` in #29113. In this PR I now add a new `PartialHomeomorph` which is a `PartialEquiv` that is continuous on both source and target. An `OpenPartialHomeomorph` is then a `PartialHomeomorph` that additionally has open source and target. `PartialHomeomorph` should find uses at least for and manifolds (`ModelWithCorners`). Afterwards, I want to add a `ClosedPartialHomeomorph` to use for CWComplexes. --- I don't have a lot of experience doing these kind of modifications of a large piece of code. Additionally, I am not familiar with the main uses of `OpenPartialHomeomorph` in Mathlib. So while I did this to the best of my abilities, you should read this carefully because there might be things I did wrong or in non-ideal ways. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-topology	1569/139	Mathlib.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/OpenPartialHomeomorph/Basic.lean,Mathlib/Topology/OpenPartialHomeomorph/Composition.lean,Mathlib/Topology/OpenPartialHomeomorph/Constructions.lean,Mathlib/Topology/OpenPartialHomeomorph/Defs.lean,Mathlib/Topology/OpenPartialHomeomorph/IsImage.lean,Mathlib/Topology/PartialHomeomorph/Basic.lean,Mathlib/Topology/PartialHomeomorph/Composition.lean,Mathlib/Topology/PartialHomeomorph/Constructions.lean,Mathlib/Topology/PartialHomeomorph/Defs.lean,Mathlib/Topology/PartialHomeomorph/IsImage.lean	19	2	['github-actions', 'grunweg']	grunweg assignee:grunweg	10-25241 10 days ago	unknown	0-0 0 seconds
25822	ScottCarnahan author:ScottCarnahan	WIP: experiments with vertex algebras	This is a testbed for various attempts at things. Please don't bother reviewing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25821. Original PR: https://github.com/leanprover-community/mathlib4/pull/25821	WIP large-import	8547/266	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/ChevalleyEilenberg.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Cocycle.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/Extension/CentralExtension.lean,Mathlib/Algebra/Lie/Graded.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Nusmeval.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Algebra/Vertex/Affine.lean,Mathlib/Algebra/Vertex/Basic.lean,Mathlib/Algebra/Vertex/Defs.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/Lattice.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Data/Prod/RevLex.lean,Mathlib/Data/Set/SMulAntidiagonal.lean,Mathlib/GroupTheory/GroupAction/Equiv.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/DividedPowers/Cauchy.lean,Mathlib/RingTheory/FormalSeries.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/PowerSeries/Binomial.lean	44	32	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	10-16146 10 days ago	340-38276 340 days ago	0-2 2 seconds
37190	cjrl author:cjrl	feat(Combinatorics): Set-Valued Pigeonhole Principle	This PR contributes two theorems to combinatorics: - `exists_lt_card_cover_of_card_biUnion_lt_card` is a set-valued version of the pigeonhole principle. - `sum_card_eq_sum_card_cover_biUnion` is a set theoretic corollary of a double counting result proved for bipartite graphs (`Finset.sum_card_bipartiteAbove_eq_sum_card_bipartiteBelow`). This was needed to prove the above pigeonhole principle. The motivation for these results is our Latin Square PR #36698. These results were proved in less general terms in that PR, but are independent of Latin Square considerations and so we have generalized and moved them into more relevant files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	38/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Pigeonhole.lean	2	16	['IvanRenison', 'cjrl', 'ghseeli', 'github-actions', 'j-loreaux', 'vlad902']	b-mehta assignee:b-mehta	10-12817 10 days ago	36-33313 36 days ago	52-4105 52 days
37761	EtienneC30 author:EtienneC30	feat: define Bernoulli distribution	Define the Bernoulli distribution over an arbitrary measurable space as `Ber(x, y, p) := toNNReal p • dirac x + toNNReal (σ p) • dirac y`. Deprecate `PMF.binomial`. Co-authored-by: @DavidLedvinka --- - [ ] depends on: #37762 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability large-import	206/7	Mathlib.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/Probability/Distributions/Bernoulli.lean,Mathlib/Probability/Distributions/SetBernoulli.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/Probability/ProbabilityMassFunction/Binomial.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Integrals.lean	9	2	['github-actions', 'mathlib-dependent-issues']	sgouezel assignee:sgouezel	10-12813 10 days ago	10-50919 10 days ago	10-51774 10 days
38309	ntapiam author:ntapiam	feat(Algebra/NonAssoc): dendriform algebras	Define dendriform semirings and algebras --- This PR introduces dendriform structures such as dendriform semirings and algebras, and proves basic facts linking them to their pre-Lie counterparts. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	270/0	Mathlib.lean,Mathlib/Algebra/NonAssoc/Dendriform/Defs.lean,docs/references.bib	3	5	['dagurtomas', 'github-actions', 'ntapiam']	ocfnash assignee:ocfnash	10-12807 10 days ago	10-64985 10 days ago	25-70275 25 days
38373	Nicola9Falciola author:Nicola9Falciola	feat (Algebra/FreeAbelianGroup /Finsupp) : The support of non zero element in a freeabeliangroup is non empty	Add the lemma that for a nonzero a : FreeAbelianGroup X the support of it is non empty. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	3/0	Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean	1	7	['Nicola9Falciola', 'SnirBroshi', 'github-actions']	ocfnash assignee:ocfnash	10-12799 10 days ago	25-54942 25 days ago	26-43376 26 days
38943	felixpernegger author:felixpernegger	feat(Topology/CWComplex/Classical): discrete spaces are CW complexes	as well as some useful lemmas This is partly based on code by @scholzhannah I think this is notable to include, since it is pretty much the only (easy) "topological" sufficient condition for something being a CW complex there is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	89/3	Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/DiscreteSubset.lean	2	28	['felixpernegger', 'github-actions', 'scholzhannah']	PatrickMassot assignee:PatrickMassot	10-12796 10 days ago	12-70050 12 days ago	13-84080 13 days
39105	ldct author:ldct	feat: Add Real.exp_int_mul	Adds the missing `Real.exp_int_mul`, completing the matrix: \| \| `ℕ` \| `ℤ` \| \|---\|---\|---\| \| `ℂ` \| `Complex.exp_nat_mul` \| `Complex.exp_int_mul` \| \| `ℝ` \| `Real.exp_nat_mul` \| `Real.exp_int_mul` (new) \| --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	9/0	Mathlib/Analysis/Complex/Exponential.lean,MathlibTest/rexp.lean	2	1	['github-actions']	nobody	10-2683 10 days ago	10-2582 10 days ago	0-476 7 minutes
38859	SnirBroshi author:SnirBroshi	feat(Order/CompleteLattice/Basic): tag `iSup_of_empty'` with `@[simp]`	The theorem says `iSup f = sSup ∅` when the domain of `f` is empty, and dually `iInf f = sInf ∅`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	31/47	Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/ENat/Lattice.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/LinearAlgebra/Eigenspace/Pi.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Lift.lean	14	1	['github-actions']	nobody	9-79589 9 days ago	15-69481 15 days ago	15-73250 15 days
38464	xroblot author:xroblot	feat(FieldTheory/Galois/IsGaloisGroup): generalize mulEquivCongr	Generalizes `mulEquivCongr` from field extensions to domain extensions. The field version is renamed to `mulEquivCongr'`. Also adds some simp lemmas. --- - [x] depends on: #38377	t-algebra label:t-algebra$	56/15	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	9-78990 9 days ago	10-46681 10 days ago	10-47728 10 days
38328	astrainfinita author:astrainfinita	feat: `OrderSupSet`	This PR introduces `OrderSupSet` and `OrderInfSet`, which are typeclasses expressing that `sSup` (resp., `sInf`) returns the least upper bound (resp., the greatest lower bound) of a set whenever one exists. This allows us to prove properties about the `sSup` of specific sets (such as `∅`, singletons, finite sets, and `univ`) without any typeclasses asserting the existence of LUBs. For example, `sSup ∅ = ⊥` holds for any type equipped with `OrderBot` `OrderSupSet`, no longer requiring typeclasses like `ConditionallyCompleteLinearOrderBot`. For a general set `s`, this gives a uniform way to extend results about `IsLUB s a → motive a` to `motive (sSup s)`, `motive (⨆ i, f i)`, `motive (a ⊔ b)`, etc., which allows proof reuse for basic API such as [`csSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/ConditionallyCompleteLattice/Basic.html#csSup_insert), [`iSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#iSup_insert), and [`sSup_insert`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/CompleteLattice/Basic.html#sSup_insert) and downstream code like [`csSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#csSup_add), [`sSup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Pointwise/CompleteLattice.html#sSup_add), and [`sup_add`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Lattice.html#sup_add). Furthermore, this allows us to refactor incrementally, reducing the dependency of results about various completeness typeclasses on the specific implementation of `sSup`. --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	156/73	Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Defs.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/SetNotation.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	7	16	['JovanGerb', 'astrainfinita', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'openendings', 'vihdzp']	nobody	9-77346 9 days ago	9-77385 9 days ago	15-21686 15 days
38234	vihdzp author:vihdzp	chore: make `IsSuccLimit` a structure	This lets us name the fields. Note that the `mk_iff` lemma overwrites a recently deprecated theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	40/33	Mathlib/Order/SuccPred/InitialSeg.lean,Mathlib/Order/SuccPred/Limit.lean	2	5	['github-actions', 'plp127']	nobody	9-75150 9 days ago	9-75221 9 days ago	25-63501 25 days
37932	idontgetoutmuch author:idontgetoutmuch	feat: Exponential map of Lie group is smooth	We construct the exponential map `expLie : g → G` for a Lie group `G` and prove that it is smooth. The main reference is: * Eckhard Meinrenken, Lie Groups and Lie Algebras, Lecture Notes, University of Toronto. Available at https://www.math.toronto.edu/mein/teaching/LectureNotes/lie.pdf --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	392/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothLieExp.lean	2	31	['github-actions', 'grunweg', 'idontgetoutmuch', 'wwylele']	nobody	9-68492 9 days ago	30-72650 30 days ago	0-973 16 minutes
39116	khwilson author:khwilson	feat(Topology/Semicontinuity/Michael): michael's selection theorem	Michael's selection theorem states that a correspondence `f : α → Set β` from a normal, paracompact topological space `α` to a Frechet space `β` that is lower hemicontinuous, and has nonempty, closed, convex values admits a continuous selection, i.e., a map `g : α → β` such that `g x ∈ f x` for all `x`. This theorem is used in many places, e.g., to find continuous sections to certain functions. This PR proves this theorem. N.B. At this time, this PR doesn't pass as it depends on two other PRs which may go through substantial changes - [ ] depends on: #38601 - [ ] depends on: #39063 AI Disclosure: Various simplifications and refactors provided by Claude Code and then edited by me. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	159/0	Mathlib/Topology/Semicontinuity/Michael.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	9-64769 9 days ago	9-64859 9 days ago	0-29 29 seconds
39108	idontgetoutmuch author:idontgetoutmuch	feat(Geometry/Manifold/GroupLieAlgebra): Add mfderiv_mul_left_mul and left-translate for integral curves	Add the following: `mfderiv_mul_left_mul`: the derivative of left-multiplication satisfies a chain rule: $$d(L_{g \cdot h})_x = d(L_g)_{h \cdot x} \circ d(L_h)_x$$ `mulInvariantVectorField_mul`: the vector field at the translated point is the push forward of the vector field: $$V(g \cdot h) = d(L_g)_h(V(h))$$ `IsMIntegralCurve.left_translate`: using these, if $\gamma$ is an integral curve of $V$, then so is $t \mapsto g \bullet \gamma(t)$ for any $g \in G$, since: $$\frac{d}{dt}(g \bullet \gamma(t)) = d(L_g)_{\gamma(t)}\left(\frac{d\gamma}{dt}(t)\right) = d(L_g)_{\gamma(t)}(V(\gamma(t))) = V(g \bullet \gamma(t))$$ I argue () all the time with LLMs so this PR will certainly have had some input from them. Is that enough of a disclosure? () Like Lewis Carroll: In my youth said the sage I took to the law and argued each case with wife And the muscular strength that it gave to my jaw has lasted the rest of my life	t-differential-geometry new-contributor awaiting-author LLM-generated	73/0	Mathlib/Geometry/Manifold/GroupLieAlgebra.lean	1	8	['github-actions', 'grunweg']	nobody	9-38982 9 days ago	9-39047 9 days ago	0-37992 10 hours
39123	SnirBroshi author:SnirBroshi	chore(Data/Matrix/Basic): mention `mopMatrix` in `transpose{Ring/Alg}Equiv`s docstring and vice versa	- `RingEquiv.mopMatrix` and `transposeRingEquiv` differ by a `ᵐᵒᵖ` since the latter assumes `CommMagma α` instead of `Mul α` - `AlgEquiv.mopMatrix` and `transposeAlgEquiv` differ by a `ᵐᵒᵖ` since the latter assumes `CommSemiring α` instead of `Semiring α` --- Also slightly golfs `RingEquiv.mopMatrix` as a drive-by. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	18/11	Mathlib/Data/Matrix/Basic.lean	1	1	['github-actions']	nobody	9-35806 9 days ago	9-35888 9 days ago	9-35881 9 days
39126	joelriou author:joelriou	feat(CategoryTheory/Functor/Derived): derived functors are triangulated	--- - [ ] depends on: #39117 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR	423/7	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerivedTriangulated.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedCommShift.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedTriangulated.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Shift/CommShift.lean,Mathlib/CategoryTheory/Shift/Localization.lean	9	2	['github-actions', 'mathlib-dependent-issues']	nobody	9-29692 9 days ago	9-31325 9 days ago	0-1 1 second
38829	AnandGokhale author:AnandGokhale	feat(Analysis/ODE/Gronwall): added gronwall-bellman inequality	Added 2 lemmas and 1 theorem to Analysis.ODE.Gronwall, making progress towards a TODO. Lemma 1: Wrapper for Fundamental Theorem of Calculus Lemma 2: Wrapper for the continuity of an integral on a closed, ordered interval Theorem: Gronwall bellman inequality, as stated with proof in Appendix of Hassan Khalil, Nonlinear control, 3rd edition.	t-analysis new-contributor large-import	125/2	Mathlib/Analysis/ODE/Gronwall.lean	1	12	['AnandGokhale', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	j-loreaux assignee:j-loreaux	9-25978 9 days ago	10-26061 10 days ago	11-73004 11 days
39111	hanwenzhu author:hanwenzhu	chore(Probability/Martingale): use `to_dual` for Submartingale/Supermartingale	WIP, will probably split to a PR for EventuallyLE etc cc @CoolRmal --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	169/169	Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Translate/ToDual.lean	12	1	['github-actions']	nobody	9-24434 9 days ago	unknown	0-0 0 seconds
38324	BryceT233 author:BryceT233	chore(RingTheory/AdicCompletion): make `AdicCompletion.map` linear on linear maps	This PR upgrades `AdicCompletion.map` to be an R-linear map on the space of linear maps `M →ₗ[R] N`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	38/12	Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	9-24159 9 days ago	25-16050 25 days ago	27-85149 27 days
38587	dagurtomas author:dagurtomas	feat(Tactic/CategoryTheory): concrete category boilerplate	Adds `mk_concrete_category`, a command for generating the initial boilerplate for concrete categories whose morphisms are given by a bundled function type. The command creates the wrapper `Hom` type, named category and concrete category instances, `ofHom`, `Hom.hom`, and the basic dsimp lemmas. It handles parameterized categories such as `ModuleCat`, and has a paired additive/multiplicative form for generating both structures at once (e.g. `MonCat`/`AddMonCat`). Includes test categories checking the generated declarations. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated t-meta t-category-theory	905/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/MkConcreteCategory.lean,MathlibTest/CategoryTheory/MkConcreteCategory.lean	4	8	['dagurtomas', 'eric-wieser', 'github-actions']	adamtopaz assignee:adamtopaz	9-12477 9 days ago	12-3216 12 days ago	12-3970 12 days
38713	justus-springer author:justus-springer	feat(Algebra/Category/ModuleCat/Sheaf/ChangeOfRings): API for `restrictScalars`	Extend the `restrictScalars` API for presheaves and sheaves of modules to match the existing API in `ModuleCat/ChangeOfRings`. For both `PresheafOfModules` and `SheafOfModules` we add: - `restrictScalarsCongr`: restriction of scalars along equal morphisms are naturally isomorphic - `restrictScalarsId'/restrictScalarsId`: restriction along the identity is naturally isomorphic to the identity functor - `restrictScalarsComp'/restrictScalarsComp`: restriction along a composition is naturally isomorphic to the composition of restriction functors - `restrictScalarsEquivalenceOfIso`: an isomorphism `R ≅ R'` of (pre)sheaves of rings induces an equivalence of categories of (pre)sheaves of modules. We also move up the "simp barrier": `PresheafOfModules.restrictScalars` and `SheafOfModules.restrictScalars` are no longer `@[simps]` as they have their own API now. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-algebra label:t-algebra$	326/5	Mathlib/Algebra/Category/ModuleCat/Presheaf/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafification.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/ChangeOfRings.lean	3	6	['dagurtomas', 'github-actions', 'justus-springer']	joelriou assignee:joelriou	9-12476 9 days ago	16-63621 16 days ago	17-84240 17 days
38720	tb65536 author:tb65536	feat(GroupTheory/Rank): nontrivial groups have positive rank	This PR proves that nontrivial groups have positive rank. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	18/0	Mathlib/GroupTheory/Rank.lean	1	2	['github-actions', 'wwylele']	mattrobball assignee:mattrobball	9-12475 9 days ago	19-46152 19 days ago	19-46146 19 days
39130	peabrainiac author:peabrainiac	feat(Topology/Algebra): topological multiplicative torsors	Introduce a class `IsTopologicalTorsor` for topological torsors of multiplicative groups, as a multiplicative counterpart to the existing `IsTopologicalAddTorsor` for topological torsors of additive groups. --- - [ ] depends on: #38896 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-algebra blocked-by-other-PR label:t-algebra$	464/349	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/Group/AddTorsor.lean,Mathlib/Topology/Algebra/ProperAction/AddTorsor.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	9-12294 9 days ago	9-12752 9 days ago	0-1162 19 minutes
38595	openendings author:openendings	chore(CategoryTheory): remove defeq abuse in Monad/Kleisli.lean	Currently most of Kleisli.lean uses defeq abuse to perform deep rewrites equivalent to `Kleisli.of_mk`, `Kleisli.mk_of`, etc. This PR removes all backward.isDefEq.respectTransparency from the file. Additionally: - Add `theorem Kleisli.comp`, encoding `Kleisli.category.map_comp` in the base category. - Add `theorem Cokleisli.comp`, encoding `category.map_comp` in the base category. - Make `C` implicit in `Monad.unit_naturality` and `Monad.mu_naturality`. - Make `C` implicit in `Comonad.counit_naturality` and `Comonad.delta_naturality`. --- - ~~I would greatly appreciate advice ([e.g. via Zulip](https://leanprover.zulipchat.com/#user/1060393)) on tackling the remainder of this file: the defeqs mostly appear in morally `simp`/`calc` proofs that look horrid in `refine` style. I can supply more rfl theorems like `of_mk` and `mk_of` (and hope to do so in subsequent PRs), but don't know how to use them for a deep type rewrite.~~ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author WIP	95/28	Mathlib/CategoryTheory/Monad/Basic.lean,Mathlib/CategoryTheory/Monad/Kleisli.lean,MathlibTest/CategoryTheory/Monad.lean	3	22	['dagurtomas', 'github-actions', 'joelriou', 'openendings']	nobody	9-10735 9 days ago	21-5525 21 days ago	0-4425 1 hour
39134	peabrainiac author:peabrainiac	chore(Algebra): module deprecations for `Mathlib.Algebra.AddTorsor`	--- - [ ] depends on: #38896 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	650/538	Mathlib.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Torsor/Basic.lean,Mathlib/Algebra/Torsor/Defs.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Defs.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/Group/AddTorsor.lean,Mathlib/Topology/Algebra/MulAction.lean,scripts/noshake.json	14	2	['github-actions', 'mathlib-dependent-issues']	nobody	8-85715 8 days ago	8-85716 8 days ago	0-1666 27 minutes
38896	peabrainiac author:peabrainiac	feat(Algebra): multiplicative torsors	Introduce a class `Torsor` for torsors of multiplicative groups, as a multiplicative counterpart to the existing `AddTorsor` for torsors of additive groups. --- Adopted / migrated from #8608. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra file-removed label:t-algebra$	643/544	Mathlib.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Torsor/Basic.lean,Mathlib/Algebra/Torsor/Defs.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Defs.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/Group/AddTorsor.lean,Mathlib/Topology/Algebra/MulAction.lean,scripts/noshake.json	14	2	['github-actions', 'grunweg']	nobody	8-84021 8 days ago	8-84094 8 days ago	15-1374 15 days
38855	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Indexed): `≤` version of `ciSup_or'` for `ConditionallyCompleteLattice`	Deprime `ciSup_or'` because there's no `ciSup_or`, and add a `≤` version (and dual) for `ConditionallyCompleteLattice`. Only `≤` because equality does not hold when `p ≠ q` without `sSup ∅ = ⊥`. --- `ciSup_or'` can't have a dual because there's no dual to `ConditionallyCompleteLinearOrderBot`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	8/1	Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	1	1	['github-actions']	nobody	8-74387 8 days ago	16-9195 16 days ago	16-9188 16 days
38856	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Indexed): `iSup_iSup_eq_{left/right}` for `ConditionallyCompleteLinearOrderBot`	and `≤` versions for `ConditionallyCompleteLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	32/9	Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	2	1	['github-actions']	nobody	8-74224 8 days ago	16-2114 16 days ago	16-2107 16 days
38597	kim-em author:kim-em	chore: backport robustness changes from bump/nightly-2026-04-27	See [#nightly-testing > nightly#213 adaptations for nightly-2026-04-27 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/428973-nightly-testing/topic/nightly.23213.20adaptations.20for.20nightly-2026-04-27/near/591262169).	t-category-theory delegated	91/26	Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Hypercover/One.lean	7	10	['github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	joelriou assignee:joelriou	8-69401 8 days ago	8-69402 8 days ago	11-49769 11 days
38216	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet/KanComplex): MulStruct.assoc	--- - [ ] depends on: #38665 - [ ] depends on: #38662 - [ ] depends on: #38664 - [x] depends on: #38172 - [x] depends on: #38367 - [x] depends on: #38063 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP large-import blocked-by-other-PR	450/3	Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/CategoryWithFibrations.lean,Mathlib/AlgebraicTopology/SimplicialSet/KanComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/KanComplex/MulStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/Op.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-56241 8 days ago	30-30240 30 days ago	0-1 1 second
39115	chrisflav author:chrisflav	feat(RingTheory): flat is stable under filtered colimits	More precisely, we show that `ObjectProperty.ind ModuleCat.flat = ModuleCat.flat`. From Proetale. --- - [ ] depends on: #39114 - [ ] depends on: #39145 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	193/0	Mathlib.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Zero.lean,Mathlib/RingTheory/Flat/Ind.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	8-36063 8 days ago	unknown	0-0 0 seconds
38837	kbuzzard author:kbuzzard	feat: add "higher instance priority" library note	We add a library note explaining the logic in making instances like `Semiring.toModule` higher priority than the default. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #38704 [only because one of the claims in the note is false without it]		19/0	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Module/Defs.lean	4	5	['github-actions', 'kbuzzard', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-33640 8 days ago	8-33414 8 days ago	9-20178 9 days
39151	anovickis author:anovickis	feat(Analysis/CStarAlgebra/Matrix): IsTopologicalGroup for specialUnitaryGroup	Adds `ContinuousInv` and `IsTopologicalGroup` instances for `Matrix.specialUnitaryGroup n 𝕜`. The unitary group `Matrix.unitaryGroup n α` already inherits these via the `unitaryGroup ≡ unitary R` abbrev + existing instances on `unitary R` (in `Mathlib/Topology/Algebra/Star/Unitary.lean`). However, `specialUnitaryGroup` is the sub-Submonoid `unitaryGroup ⊓ MonoidHom.mker detMonoidHom` — it does not auto-inherit those instances since it is not literally an alias of `unitary R`. ### New declarations - `instance Matrix.specialUnitaryGroup.instContinuousInv` — proven via `Matrix.star_eq_inv` + `continuous_star` - `instance Matrix.specialUnitaryGroup.instIsTopologicalGroup` — combining `ContinuousMul` (from Submonoid structure) + `ContinuousInv` Both placed inside the existing `EntrywiseSupNorm` section in `Mathlib/Analysis/CStarAlgebra/Matrix.lean` (the natural neighborhood for matrix-specific topological structure on (special) unitary groups). ### Motivation These instances enable using `specialUnitaryGroup` as a topological group in homogeneous-space constructions (e.g., `SU(3) ⧸ T = F₂` flag manifolds). They complement #39146 (CompactSpace instances for the same groups) — together giving the standard 'compact topological group' typeclass set on `specialUnitaryGroup`. ### Verification \`\`\`lean example : ContinuousInv (Matrix.specialUnitaryGroup (Fin 3) ℂ) := inferInstance -- now works example : IsTopologicalGroup (Matrix.specialUnitaryGroup (Fin 3) ℂ) := inferInstance -- now works \`\`\` Both fail on master without this PR; both succeed after.	t-analysis new-contributor awaiting-author	30/0	Mathlib/Analysis/CStarAlgebra/Matrix.lean	1	3	['github-actions', 'j-loreaux', 'wwylele']	nobody	8-28106 8 days ago	8-28106 8 days ago	0-3921 1 hour
38489	Jun2M author:Jun2M	feat(Topology/Algebra/InfiniteSum): Generalize ENNReal lemmas	This PR generalizes many theorems in Topology/Algebra/InfiniteSum/ENNReal.lean from `ENNREal` to any type that satisfies a list of order-related instances, mostly `[CommMonoid α] [CompleteLattice α] [CanonicallyOrderedMul α] [TopologicalSpace α] [SupConvergenceClass α]` Deprecation of the original `ENNReal` lemmas are done in the next PR: #38193. Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		261/3	Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean	4	7	['Jun2M', 'SnirBroshi', 'github-actions', 'wwylele']	nobody	8-25021 8 days ago	8-25098 8 days ago	24-15136 24 days
37298	artie2000 author:artie2000	refactor(Algebra/Order): unbundle group and ring cone	* Unbundle `GroupCone` and `RingCone` using `Submonoid.IsMulPointed` The material in `Mathlib.Algebra.Group.Submonoid.Support` was created to treat uniformly * positive cones in groups and rings * pointed cones in vector spaces over an ordered field * orderings in rings This PR deprecates the [GroupCone](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Group/Cone.html#GroupCone) and [RingCone](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Ring/Cone.html#RingCone) structures, making use of the predicates `Submonoid.IsMulPointed` and `AddSubmonoid.IsPointed` defined in that file instead. See also #36863 for the analogous change to ring orderings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	136/31	Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Ring/Cone.lean	2	2	['github-actions', 'joneugster']	themathqueen assignee:themathqueen	8-12415 8 days ago	50-40259 50 days ago	50-40807 50 days
37477	kebekus author:kebekus	feat: canonical decomposition of complex-meromorphic functions on disks	Establish the Finite Canonical Decomposition of meromorphic functions, where a complex-meromorphic function `f` on a disk is written as a product of an analytic function without zeros and poles, and canonical factors that take only values of norm one on the boundary of the disk. A future PR will extend this theorem to handle zeros/poles on the boundary of the disk. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	305/10	Mathlib.lean,Mathlib/Analysis/Complex/CanonicalDecomposition.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Meromorphic/RCLike.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	5	4	['github-actions', 'j-loreaux', 'kebekus']	j-loreaux assignee:j-loreaux	8-12414 8 days ago	19-85544 19 days ago	47-70004 47 days
37712	eric-wieser author:eric-wieser	feat: add a `LawfulXor` typeclass	I've put this in mathlib since it can use `Function.Involutive`; it can of course be upstreamed at a later date. Having this generalization encourages downstream code in cslib to be expressed in terms of involutive functions, rather than just `^^^` on bitvectors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	130/0	Mathlib.lean,Mathlib/Data/LawfulXor.lean	2	6	['eric-wieser', 'github-actions', 'linesthatinterlace']	joneugster assignee:joneugster	8-12412 8 days ago	13-13299 13 days ago	20-5884 20 days
37956	artie2000 author:artie2000	feat(Algebra/Polynomial): lemmas about polynomial degree	* Add various small lemmas about polynomial degree --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	28/5	Mathlib/Algebra/Polynomial/Degree/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Monic.lean,MathlibTest/hintAll.lean	5	7	['artie2000', 'github-actions', 'vihdzp']	kim-em assignee:kim-em	8-12410 8 days ago	36-40627 36 days ago	36-42421 36 days
38431	joelriou author:joelriou	refactor(Topology): redefine Delta-generated spaces	Delta-generated spaces are made particular cases of `X`-generated spaces, where `X` is a family of topological spaces. --- - [x] depends on: #38080 - [x] depends on: #37799 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology large-import	139/208	Mathlib/Topology/Category/DeltaGenerated.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Convenient/Category.lean,Mathlib/Topology/Convenient/GeneratedBy.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	ADedecker assignee:ADedecker	8-12405 8 days ago	12-41679 12 days ago	12-41750 12 days
38449	WenrongZou author:WenrongZou	feat(MvPowerSeries): some lemmas about `subst` of infinite sum	In this PR, I add some lemmas about substituion of a infinite sum equal to infinite sum of substitution. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	34/0	Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	chrisflav assignee:chrisflav	8-12404 8 days ago	18-75815 18 days ago	24-44220 24 days
38488	b-mehta author:b-mehta	feat(Data/Finset/Card): iterating a function's image on a finite set stabilises	...and does so in a bounded number of steps (which is why this is Finset-specific). In a later PR, I'll add this for endofunctions on a fintype, as well as add a Set.Finite version. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	40/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Image.lean	2	16	['SnirBroshi', 'b-mehta', 'github-actions']	joneugster assignee:joneugster	8-12402 8 days ago	24-17637 24 days ago	24-17630 24 days
38584	TJHeeringa author:TJHeeringa	feat(Analysis/InnerProductSpace/Reproducing): Add outerKernel, mem_iff	--- Adds the `outerKernel` definition and the theorem `mem_iff`. These are needed for proving statements involving embeddings of RKHS. I can split `mem_of_posSemidef` and `mem_iff` off into a different pull request if that is preferred. The theorems `mem_of_posSemidef` and `posSemidef_of_mem` are the two directions of `mem_iff`. `posSemidef_of_mem` is slightly stronger than the converse direction of `mem_iff` in the sense that it also specifies the constant `c` in the statement. The specified `c` is in fact the smallest possible `c` for which the statement holds. The statement `mem_of_posSemidef` proves `∃ (g : H), (g : X → V) = f`. We could instead write `f ∈ (coeCLM 𝕜 (H:=H)).range`. Making this change would require the addition of the line `simp only [LinearMap.mem_range, coe_coe, coeCLM_apply]` in the beginning of the proof. The full beginning is then ``` lemma mem_of_posSemidef (f : X → V) {c : ℝ} (hc : ((c : 𝕜) ^ 2 • kernel H - outerKernel 𝕜 f).PosSemidef) : f ∈ (coeCLM 𝕜 (H:=H)).range := by simp only [LinearMap.mem_range, coe_coe, coeCLM_apply] let Laux : ... ``` Making a `MemRKHS` like MemLp and MemSobolev and then writing `MemRKHS H f` is also an option. Happy to change it to whatever is preferred. The proof of `mem_of_posSemidef` is based on the idea that any function f in the RKHS satisfies `=\sum_{n} ` for `x_n\in X` and `v_n\in V` by the reproducing property. We define the operator L(\sum_n K(\cdot,x_n)v_n) = \sum_{n} . This is bounded by the condition based on the kernels, and thus extends to a bounded linear operator on the RKHS. Its Riesz' representer agrees pointwise with f. AI: When asking how to avoid Classical.choose in constructing the operator L, Claude suggested the approach of going through the quotient. I made the proof using Claude as supplementary Loogle. Afterwards, I asked it to help shorted the proofs. Some suggestions for `mem_of_posSemidef` were applied. The other suggestions were not helping or not correct. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	122/1	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	7	['TJHeeringa', 'github-actions', 'themathqueen']	j-loreaux assignee:j-loreaux	8-12398 8 days ago	21-41293 21 days ago	21-41664 21 days
38649	chrisflav author:chrisflav	chore(RingTheory): equality of linear map with values in finite module spreads out	We add some corollaries of `Module.Finite.exists_smul_of_comp_eq_of_isLocalizedModule`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	75/1	Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Module.lean	3	2	['github-actions']	alreadydone assignee:alreadydone	8-12396 8 days ago	20-51545 20 days ago	20-51538 20 days
39018	khwilson author:khwilson	feat(Topology/Separation/Regular): facts about `nhdsSet` in normal spaces	A few lemmas about `nhdsSet` in normal spaces that mirror `nhds` in regular spaces. Originally built as part of a proof of Michael's Selection Theorem, that didn't make the final cut, but nonetheless seemed useful to the library. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/Separation/Regular.lean	1	1	['github-actions']	j-loreaux assignee:j-loreaux	8-12392 8 days ago	12-7619 12 days ago	12-7627 12 days
39033	tb65536 author:tb65536	feat(Analysis/DirichletEigenvalue): Dirichlet eigenvalues of a set	This PR defines the Dirichlet eigenvalues of a set (in the sense of "can you hear the shape of a drum"). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	58/0	Mathlib.lean,Mathlib/Analysis/DirichletEigenvalue.lean	2	1	['github-actions']	ADedecker assignee:ADedecker	8-12391 8 days ago	11-55993 11 days ago	11-55988 11 days
39063	khwilson author:khwilson	feat(Topology/Algebra/Module/LocallyConvex): a very nice basis of locally convex spaces	In proving facts about locally convex spaces, you often work with a basis of the neighborhoods of 0 that are open, symmetric, convex, antitone, and have the property that `V (n + 1) + V (n + 1) ⊆ V n` and `closure (V (n + 1)) ⊆ V n`. These lemmas construct such a basis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	89/0	Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean	2	2	['github-actions', 'khwilson']	j-loreaux assignee:j-loreaux	8-12390 8 days ago	11-5096 11 days ago	11-5103 11 days
39107	SnirBroshi author:SnirBroshi	feat(Geometry/Manifold/ChartedSpace): `H ≃ₜ M` → `ChartedSpace H M`	--- I thought it was strange that `Homeomorph`s didn't have this easy dot-notation, though I'm not familiar with this part of the library so I might be missing something. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	6/0	Mathlib/Geometry/Manifold/ChartedSpace.lean	1	1	['github-actions']	PatrickMassot assignee:PatrickMassot	8-12385 8 days ago	9-77313 9 days ago	9-77306 9 days
38275	TTony2019 author:TTony2019	feat: Add `AffineEquiv.image_intrinsicInterior`	## Summary This PR generalizes the existing lemma `AffineIsometry.image_intrinsicInterior` to the setting of affine equivalences, yielding the corresponding result `AffineEquiv.image_intrinsicInterior`. Since affine equivalences are more general than affine isometries, the proof requires an additional finite-dimensionality assumption. The key extra input is that in finite-dimensional spaces, an affine equivalence induces a homeomorphism via `AffineEquiv.toHomeomorphOfFiniteDimensional`, so the assumptions are adjusted accordingly. Apart from these extra assumptions, the argument is essentially the same as for `AffineIsometry.image_intrinsicInterior`. ## Collaboration This PR was developed together with @imathwy.	t-analysis new-contributor	252/41	Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/LinearAlgebra/AffineSpace/Restrict.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Homeomorph/Defs.lean	5	25	['github-actions', 'imathwy', 'j-loreaux', 'themathqueen']	j-loreaux assignee:j-loreaux	8-4705 8 days ago	8-4705 8 days ago	16-33208 16 days
39163	j-loreaux author:j-loreaux	feat: `star` structures on `ContinuousLinearMapWOT`	In particular, with these instances it makes sense to consider the `StarSubalgebra.topologicalClosure` of some `S : StarSubalgebra 𝕜 (F →WOT[𝕜] F)`. --- - [ ] depends on: #37914 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	157/4	Mathlib.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/TransferInstance.lean,Mathlib/Analysis/InnerProductSpace/WeakOperatorTopology.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	8-3789 8 days ago	8-3789 8 days ago	0-405 6 minutes
29764	ScottCarnahan author:ScottCarnahan	feat(Algebra/Vertex): API up to residue products (WIP)	This PR contains definitions leading up to the residue product of vertex operators and some basic properties. Parts will be split off as smaller PRs when I have time. --- - [ ] depends on: #25831 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import merge-conflict label:t-algebra$	1692/19	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/RestrictedValue.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/RingTheory/Binomial.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean	15	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-77215 7 days ago	242-50461 242 days ago	0-12586 3 hours
38785	scholzhannah author:scholzhannah	feat: use `alias_in` attribute for CW complexes	Using the `alias_in` attribute for classical CW complexes to get rid of the `export` sections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	103/58	Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean	3	8	['github-actions', 'grunweg', 'scholzhannah']	grunweg, mcdoll, urkud assignee:urkud assignee:grunweg assignee:mcdoll	7-74017 7 days ago	10-74336 10 days ago	17-62691 17 days
39154	joelriou author:joelriou	feat(CategoryTheory): the left derived functor commutes with the shift	This dualized the result in #39117. --- - [ ] depends on: #39117 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR	448/7	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerivedCommShift.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedCommShift.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Shift/CommShift.lean,Mathlib/CategoryTheory/Shift/Localization.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	7-71008 7 days ago	8-29904 8 days ago	0-1 1 second
39186	kbuzzard author:kbuzzard	perf(RingTheory/LaurentSeries): add some instances	Typeclass inference was expensively failing at some point in `LaurentSeries.valuation_compare` without these instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discovered by getting Claude Code to edit Lean's typeclass inference algorithm and then compile lean and mathlib and see what breaks. Found out that typeclass inference is going down a big hole in this file; this fixes the hole.	t-ring-theory	9/0	Mathlib/RingTheory/LaurentSeries.lean	1	3	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	7-69254 7 days ago	7-70790 7 days ago	7-70783 7 days
26304	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Pushforward of algebraic cycles	In this PR we define a notion of the "pushfoward of functions with locally finite support". We give this PR the suggestive title "pushforward of algebraic cycles" because we will go on to model algebraic cycles on a scheme X as functions from X to the integers with locally finite support. - [x] depends on: #26225 - [x] depends on: #26259 - [x] depends on: #35807 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	242/0	Mathlib.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Constructible.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean,Mathlib/Topology/Maps/Proper/Basic.lean,Mathlib/Topology/Spectral/ConstructibleTopology.lean	6	45	['Raph-DG', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	joelriou assignee:joelriou	7-68620 7 days ago	7-68620 7 days ago	36-29648 36 days
39190	tb65536 author:tb65536	chore(RingTheory/LocalRing/ResidueField/Fiber): namespace file	This PR adds an `Ideal` namespace to `Fiber.lean` and adds a deprecation for one declaration that should be in this namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	9/3	Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean	1	1	['github-actions']	nobody	7-67935 7 days ago	7-67935 7 days ago	7-67929 7 days
33664	ooovi author:ooovi	feat(Geometry/Convex/Cone/Pointed): face lattice of pointed cones	- Define PointedCone.IsFaceOf, for a pointed cone being a face of another pointed cone. - Prove some basic properties, that faces are extreme sets of their cone, and how they behave under intersection, map and product operations. - Define `Face` by bundling the `IsFaceOf` structure, and show the complete lattice structure on it. - Prove that taking the product of two faces is an order isomorphism. Co-authored-by: Martin Winter --- - [x] depends on: #33780 for the definition of the lineal space - [ ] depends on: #39185 for `isFaceOf` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry blocked-by-other-PR	485/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/Face/Basic.lean,Mathlib/Geometry/Convex/Cone/Face/Lattice.lean	3	200	['YaelDillies', 'eric-wieser', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'ooovi', 'vihdzp']	nobody	7-66139 7 days ago	33-49446 33 days ago	5-78229 5 days
39185	ooovi author:ooovi	feat(Geometry/Convex/Cone/Pointed): faces of pointed cones	- Define PointedCone.IsFaceOf, for a pointed cone being a face of another pointed cone. - Prove some basic properties, that faces are extreme sets of their cone, and how they behave under intersection, map and product operations. Co-authored-by: Martin Winter --- split off of #33664 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	289/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/Face/Basic.lean	2	4	['YaelDillies', 'github-actions', 'martinwintermath', 'mathlib-bors']	YaelDillies assignee:YaelDillies	7-65798 7 days ago	7-68408 7 days ago	0-2659 44 minutes
37631	linesthatinterlace author:linesthatinterlace	feat: add `Function.{prod,diag,fstComp,sndComp,prodMap}`	Adds `Mathlib/Logic/Function/Init.lean`, centralising a cluster of general-purpose function operations in the `Function` namespace: - `Function.dcomp` (notation `∘'`) — dependent composition, moved here from `Mathlib/Logic/Function/Defs.lean`. - `Function.prod` (notation `⋏`) — pointwise pair of two (possibly dependent) functions, `(f ▽ g) i = (f i, g i)`. - `Function.fstComp` / `Function.sndComp` — the two components of a function valued in a product; inverse to `Function.prod`. - `Function.diag` (notation `△`) — the diagonal `a ↦ (a, a)`. - `Function.prodMap` — dot-notation alias for `Prod.map`; collapses to `Prod.map` under `simp` so existing API applies unchanged. `Pi.prod` is removed in favour of `Function.prod` (which is itself the dependent version); a deprecated alias is provided. The file depends only on `Mathlib.Init` (and `Batteries.Tactic.Alias` for the deprecated alias) so it can be upstreamed to Batteries / core without pulling mathlib dependencies. - [x] depends on: #38963	t-logic WIP	247/27	Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Data/Fin/Tuple/Curry.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/Init.lean	7	21	['SnirBroshi', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'linesthatinterlace', 'mathlib-dependent-issues']	fpvandoorn assignee:fpvandoorn	7-59770 7 days ago	14-36292 14 days ago	24-73399 24 days
38755	TJHeeringa author:TJHeeringa	feat(Analysis/innerProductSpace/GramMatrix): Add Gram.posSemidef_of_mapL	--- `Analysis/innerProductSpace/TensorProduct` has a TODO for a continuous version of `TensorProduct.map`. One place which contains a proof for this is at [stack](https://math.stackexchange.com/a/3934668). This PR is lemma 1 of that. It is written with `.PosSemidef` instead of `≤` because the Löwner Order on matrices is only defined in lean for matrices with values in `𝕜`. No AI used. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	21/0	Mathlib/Analysis/InnerProductSpace/GramMatrix.lean	1	14	['TJHeeringa', 'github-actions', 'j-loreaux', 'themathqueen']	urkud assignee:urkud	7-54860 7 days ago	7-54860 7 days ago	17-32852 17 days
38500	kebekus author:kebekus	feat: integral presentation of the proximity function of value distribution theory	If `f : ℂ → ℂ` is meromorphic, establish a presentation of the proximity function `proximity f ⊤` as iterated circle averages. This statement can be used to compare the proximity- and logarithmic counting functions, and is one of the key ingredients in the proof of Cartan's classic formula for the characteristic function. This is the first section of a multi-part PR, establishing Cartan's formula. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	211/0	Mathlib.lean,Mathlib/Analysis/Complex/ValueDistribution/Proximity/IntegralPresentation.lean	2	11	['github-actions', 'kebekus', 'wwylele']	sgouezel assignee:sgouezel	7-54701 7 days ago	22-83540 22 days ago	23-78236 23 days
39191	m13683320924-hue author:m13683320924-hue	feat: define Asymptotics.IsSubpolynomial	This PR defines `Asymptotics.IsSubpolynomial l f g`, meaning that `f` is asymptotically bounded by `1 + ‖g‖ ^ k` for some `k : ℕ`. It also adds basic closure lemmas for constants, addition, multiplication, and natural powers. Towards #32658. The formalization was developed with the help of Doubao-Seed-2.0-code and manually checked in Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	259/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Subpolynomial.lean	2	3	['github-actions']	nobody	7-54064 7 days ago	7-65025 7 days ago	0-344 5 minutes
35773	joelriou author:joelriou	feat(Algebra/Category/ModuleCat): another approach to the module structure on stalks	In this draft PR, we define the colimit of a presheaf of modules indexed by an initially small cofiltered category. We apply this to the definition of fiber functors on (pre)sheaves of modules. After showing that these fiber functors are monoidal, we may deduce that the category of sheaves of modules is monoidal when the site has enough points. In particular, if `X` is a scheme, the category `X.Modules` of $$\mathcal O_X$$-Modules is monoidal. After some sorries are removed, we may obtain that the fullsubcategory of `X.Modules` consisting of quasi-coherent sheaves is also monoidal. --- - [x] depends on: #37662 - [x] depends on: #37370 - [x] depends on: #37369 - [x] depends on: #36688 - [x] depends on: #36810 - [x] depends on: #36692 - [x] depends on: #36680 - [x] depends on: #36599 - [x] depends on: #36457 - [x] depends on: #36470 - [x] depends on: #35572 - [x] depends on: #35806 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory large-import label:t-algebra$	1126/4	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Adjunction.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctorMonoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Point.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/PushforwardLaxMonoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/RestrictScalarsLaxMonoidal.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/FreeMonoidal.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Point.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/QuasicoherentMonoidal.lean,Mathlib/AlgebraicGeometry/Modules/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Sites/CoversTop/Basic.lean,Mathlib/CategoryTheory/Sites/IsSheafFor.lean	19	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-53262 7 days ago	82-39706 82 days ago	0-1 1 second
39157	vihdzp author:vihdzp	feat: `Nat.cast` commutes with addition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		26/9	Mathlib/Data/Nat/Cast/Commute.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	2	['github-actions', 'plp127']	nobody	7-52703 7 days ago	8-27768 8 days ago	8-27761 8 days
39196	tb65536 author:tb65536	feat(RingTheory/LocalRing/ResidueField/Fiber): the localization of `Ideal.Fiber` is a quotient	This PR proves that the localization of `Ideal.Fiber` is a quotient. This will be applied in #39189 to prove the ramification-inertia formula for finite flat extensions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	48/0	Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean	1	1	['github-actions']	nobody	7-51382 7 days ago	7-51382 7 days ago	7-51377 7 days
39189	tb65536 author:tb65536	feat(RingTheory/RamificationInertia/Basic): ramification-inertia formula for finite flat extensions	This PR proves the ramification-inertia formula for finite flat extensions. --- - [ ] depends on: #38825 - [ ] depends on: #39094 - [ ] depends on: #39196 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra blocked-by-other-PR label:t-algebra$	191/11	Mathlib.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	7-50899 7 days ago	7-66877 7 days ago	0-2183 36 minutes
37464	martinwintermath author:martinwintermath	feat(Geometry/Convex/Cone): Minor additions to pointed cones	Minor additions to pointed cones: * `PointedCone.ofSubmodule_le_ofSubmodule` and `PointedCone.ofSubmodule_lt_ofSubmodule`. These are not made simp lemmas, instead the underlying `Submodule.restrictScalars_le` and `Submodule.restrictScalars_lt` have been changed into simp lemmas. * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` Co-authored by: Artie Khovanov --- In preparation of #36605. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	22/16	Mathlib/Algebra/Module/Submodule/RestrictScalars.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	24	['YaelDillies', 'artie2000', 'github-actions', 'justus-springer', 'martinwintermath', 'mathlib-merge-conflicts', 'ooovi', 'vihdzp']	nobody	7-49899 7 days ago	9-76711 9 days ago	47-3329 47 days
34054	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): OmegaCompletePartialOrder instance for `Sigma` with basic `ωScottContinuous` lemmas	This PR adds an `OmegaCompletePartialOrder` instance for `Sigma` along with `ωScottContinuous` lemmas for basic operations (`mk`, `fst`, `snd`). Appropriate lemmas are marked with `@[fun_prop]` so that the `fun_prop` tactic can automatically deduce `ωScottContinuous` proofs for functions involving `Sigma`s. --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order please-merge-master awaiting-author	231/0	Mathlib/Data/Sigma/Order.lean,Mathlib/Order/OmegaCompletePartialOrder.lean	2	29	['Vierkantor', 'YellPika', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	7-48816 7 days ago	87-30067 87 days ago	16-66871 16 days
33611	urkud author:urkud	feat(ImplicitFunction): add a parametric version	--- I'm not sure if the supporting linear algebra lemmas are in the form we want to see them in Mathlib. - [x] depends on: #33585 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	191/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/Calculus/ImplicitFunction/Parametric.lean,Mathlib/LinearAlgebra/Prod.lean	4	13	['PatrickMassot', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	ADedecker assignee:ADedecker	7-43415 7 days ago	97-35954 97 days ago	36-2785 36 days
39211	urkud author:urkud	refactor: turn `Set` into a 1-field structure	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		1552/1417	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/FiniteSupport/Basic.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Action/Equidecomp.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Measure.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/FDeriv/Congr.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/CoveringMap.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/FunctionSeries.lean,Mathlib/Analysis/Normed/Group/Indicator.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/SpecialFunctions/Complex/Analytic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/CircleMap.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SumIntegralExpDecay.lean,Mathlib/CategoryTheory/Sites/JointlySurjective.lean,Mathlib/Combinatorics/Derangements/Basic.lean,Mathlib/Combinatorics/Hindman.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Partition.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/SMulAntidiagonal.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Nat/Count.lean,Mathlib/Data/Nat/Nth.lean,Mathlib/Data/Nat/Order/Lemmas.lean,Mathlib/Data/QPF/Multivariate/Basic.lean,Mathlib/Data/Real/Embedding.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/List.lean,Mathlib/Data/Set/MemPartition.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Dynamics/Ergodic/Action/Basic.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/Dynamics/Ergodic/RadonNikodym.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/Geometry/Diffeology/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	337	1	['github-actions']	nobody	7-43196 7 days ago	unknown	0-0 0 seconds
39213	m13683320924-hue author:m13683320924-hue	feat: define maximal cliques and independent sets	This PR adds explicit predicates for maximal cliques and maximal independent sets: - `SimpleGraph.IsMaximalClique` - `SimpleGraph.IsMaximalIndepSet` It also adds conversion lemmas to and from the existing `Maximal G.IsClique` and `Maximal G.IsIndepSet` formulations, plus basic complement and maximum-to-maximal lemmas. Towards #34962. The formalization was developed with the help of Doubao-Seed-2.0-code and manually checked in Lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	60/22	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	3	['SnirBroshi', 'github-actions']	nobody	7-33471 7 days ago	7-41300 7 days ago	0-389 6 minutes
37716	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Determinant): Desnanot-Jacobi identity	This PR adds the Desnanot-Jacobi identity (also known as the Lewis Carroll identity or Dodgson condensation): for any (n+2)×(n+2) matrix M over a commutative ring, $$\det(M) \cdot \det(M_{1,n}^{1,n}) = \det(M_1^1) \cdot \det(M_n^n) - \det(M_1^n) \cdot \det(M_n^1)$$ The proof follows Bressoud's Proofs and Confirmations (Cambridge University Press, 1999): multiply M by an auxiliary matrix built from columns of the adjugate, then compare determinants. This yields the identity premultiplied by det(M). To cancel, we pass to a universal polynomial ring (an integral domain with nonzero determinant), then specialize back to arbitrary commutative rings. It seems there's some interest in adding this: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Determinantal.20identity.20and.20the.20Cauchy.20matrix.20determinant/with/582946873 ---	t-algebra new-contributor label:t-algebra$	217/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Determinant/DesnanotJacobi.lean	2	13	['SnirBroshi', 'github-actions', 'grunweg', 'kim-em', 'slavanaprienko']	nobody	7-31404 7 days ago	7-31158 7 days ago	8-69381 8 days
32608	PrParadoxy author:PrParadoxy	feat(LinearAlgebra/PiTensorProduct): API for PiTensorProducts indexed by sets	This PR addresses a TODO item in LinearAlgebra/PiTensorProduct.lean: * API for the various ways ι can be split into subsets; connect this with the binary tensor product -- specifically by describing tensors of type ⨂ (i : S), M i, for S : Set ι. Our primary motivation is to formalise the notion of "restricted tensor products". This will be the content of a follow-up PR. Beyond that, the Set API is natural in contexts where the index type has an independent interpretation. An example is quantum physics, where ι ranges over distinguishable degrees of freedom, and where its is common practice to annotate objects by the set of indices they are defined on. --- Stub file with preliminary definition of the restricted tensor product as a direct limit of tensors indexed by finite subsets of an index type: https://github.com/PrParadoxy/mathlib4/blob/restricted-stub/Mathlib/LinearAlgebra/PiTensorProduct/Restricted.lean --- - [x] depends on: #32598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor awaiting-zulip t-algebra WIP label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	31	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-30650 7 days ago	147-41372 147 days ago	10-66980 10 days
37625	slavanaprienko author:slavanaprienko	feat(LinearAlgebra/Matrix/Charpoly): general coefficient formula as sum of principal minors	This PR adds a general formula for the coefficients of `det(1 + X • M)` as sums of principal minors, generalizing the existing `coeff_det_one_add_X_smul_one` (k=1, trace) and `det_eq_sign_charpoly_coeff` (k=n, determinant). It also derives the corresponding formula for the coefficients of the characteristic polynomial via `charpolyRev`. New results: - `det_piecewise_one_eq_submatrix_det`: relates piecewise-with-identity to principal submatrix determinants - `coeff_det_one_add_X_smul_eq_sum_minors`: the k-th coefficient of `det(1 + X • M)` equals the sum of k×k principal minors - `charpoly_coeff_eq_sum_minors`: coefficients of the characteristic polynomial as signed sums of principal minors ---	t-algebra new-contributor ready-to-merge label:t-algebra$	105/1	Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean	1	28	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-bors', 'slavanaprienko', 'wwylele']	nobody	7-28909 7 days ago	7-85484 7 days ago	37-17965 37 days
39219	WenrongZou author:WenrongZou	feat(FieldTheory/Finite): add variant theorems for `expand_card`	Add `MvPolynomial, MvPowerSeries, PowerSeries` version of `FiniteField.expand_card`, which is only for polynomial. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	45/4	Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/FiniteField.lean,Mathlib/RingTheory/MvPolynomial/Expand.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/PowerSeries/Expand.lean	5	1	['github-actions']	nobody	7-28090 7 days ago	7-28131 7 days ago	7-28356 7 days
34826	wwylele author:wwylele	feat(Geometry/Euclidean): volume of a simplex and extra	WIP. sorry-free but still need cleaning up and breaking into smaller PRs --- - [x] depends on: #34697 - [x] depends on: #34858 - [x] depends on: #34859 - [x] depends on: #35039 - [x] depends on: #35358 - [ ] depends on: #35365 - [x] depends on: #35837 - [ ] depends on: #36018 - [x] depends on: #36462 - [x] depends on: #36466 - [x] depends on: #36952 - [ ] depends on: #37910 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR merge-conflict	1211/6	Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/Basic.lean,Mathlib/Geometry/Euclidean/Volume/Def.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean	9	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-27197 7 days ago	unknown	0-0 0 seconds
37399	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Paths): `IsPath` and `Nil` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	10/3	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean	2	8	['Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	7-26286 7 days ago	49-5935 49 days ago	49-6072 49 days
34891	kim-em author:kim-em	wip: ConvexSpace constructor from binary convex combinations		t-algebra large-import merge-conflict label:t-algebra$	3345/0	Mathlib/LinearAlgebra/ConvexSpace.lean	1	4	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	7-25286 7 days ago	27-71805 27 days ago	0-459 7 minutes
36863	artie2000 author:artie2000	refactor(Algebra/Order/Ring/Ordering): unbundle `RingPreordering`	The current design for [RingPreordering](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Ring/Ordering/Defs.html#RingPreordering) ran into issues at PR #32077. This PR unbundles [RingPreordering](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Order/Ring/Ordering/Defs.html#RingPreordering) into a class predicate on [Subsemiring](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Ring/Subsemiring/Defs.html#Subsemiring), generalising the material on supports as far as possible. Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Ring.20orderings.20-.20structure.20or.20predicate.3F/with/562594050 See #37298 for the analogous change to group and ring cones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	455/87	Mathlib.lean,Mathlib/Algebra/Order/Ring/Ordering/Basic.lean,Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Support.lean	4	14	['artie2000', 'chrisflav', 'github-actions', 'mathlib-merge-conflicts']	eric-wieser assignee:eric-wieser	7-25034 7 days ago	7-25034 7 days ago	49-66259 49 days
37053	artie2000 author:artie2000	refactor(Analysis/Convex/Cone): use `PointedCone` in Riesz extension theorem	Change the statement of the Riesz extension theorem to take a `PointedCone` rather than a `ConvexCone`. This PR is part of a series replacing `ConvexCone` with `PointedCone`. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Replacing.20.60ConvexCone.60.20with.20.60PointedCone.60/near/581184307 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge merge-conflict	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	9	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-merge-conflicts', 'ocfnash']	nobody	7-24912 7 days ago	7-24913 7 days ago	46-71615 46 days
39049	thorimur author:thorimur	bench: review	Benching a modification to the overlapping instances linter before suggesting it... --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	715/43	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/Normed/Field/Krasner.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/ConjSqrt.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean,Mathlib/Control/Applicative.lean,Mathlib/Control/Functor.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/Init.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Lemmas.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/NormalClosure.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/OverlappingInstances.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Connected/PathConnected.lean,MathlibTest/OverlappingInstances.lean,MathlibTest/Subsingleton.lean,MathlibTest/Variable.lean,MathlibTest/WhitespaceLinter.lean,MathlibTest/congr.lean,MathlibTest/norm_num.lean	64	6	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	nobody	7-24880 7 days ago	unknown	0-0 0 seconds
39128	joelriou author:joelriou	feat(CategoryTheory): triangulated derived functors using derivability structures	--- - [ ] depends on: #39126 - [ ] depends on: #39117 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR merge-conflict	839/16	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerivedTriangulated.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedCommShift.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedTriangulated.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/GuitartExact/KanExtension.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Derives.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/DerivesTriangulated.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/PointwiseLeftDerived.lean,Mathlib/CategoryTheory/Shift/CommShift.lean,Mathlib/CategoryTheory/Shift/Localization.lean	13	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-24879 7 days ago	9-26212 9 days ago	0-1 1 second
36605	martinwintermath author:martinwintermath	feat(Geometry/Convex/Cone): Add lemmas about interaction of hull, span and negation	Prove lemmas about the interaction of hull, span and negation. Main additions: * `PointedCone.toSubmodule` that produces a submodule with the same support given that `-C = C`. Also the corresponding `CanLift` * `PointedCone.hull_neg_pair_eq_span_singleton` proving `hull R {-x, x} = R ∙ x` (simp lemma) * `PointedCone.span_eq_hull_neg_sup_hull` proving `span R s = hull R (-s) ⊔ hull R s` * `PointedCone.mem_span` proving `x ∈ span R C ↔ ∃ p, n ∈ C, x = p - n` Considerations: there are several ways to express that a convex cone is a submodule: * `-C = C` * `-C ≤ C` or `C ≤ -C` * `C = span R C` * `C = C.lineal` The consensus was that the the first option is the most direct way to express this property, which then allows to lift to a submodule. Co-authored by: Olivia Röhrig, Kilian Rueß, Artie Khovanov --- - [ ] depends on: #37464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-convex-geometry	90/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	53	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-24833 7 days ago	48-20955 48 days ago	17-402 17 days
37951	martinwintermath author:martinwintermath	chore(Geometry/Convex/Cone): rework `PointedCone.dual` to take a cone as input in place of a set	Rework `PointedCone.dual` to take as input a cone instead of a set. This is done to untangle the functionality of `PointedCone.dual` from `PointedCone.hull` and to align it with the signature of its submodule analogue `Submodule.orthogonalBilin` (partially, with proposed functionality from #34007). See also the discussion here: [#mathlib4 > Reorganizing bilinearity and orthogonality?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Reorganizing.20bilinearity.20and.20orthogonality.3F/with/583882414). Main changes: * change signature `dual (s : Set M)` to `dual (C : PointedCone R M)`. * deprecate `dual_hull` since now obsolete in this form, instead add `mem_dual_hull` in addition to `mem_dual`. * deprecate all of `dual_empty`, `dual_zero` and `dual_singleton_zero` in favor of only `dual_bot`. * deprecate `dual_univ` in favor of `dual_top`. * add notation `R ∙₊ x` in analogy to submodule version `R ∙ x`, for use in new lemma `dual_hull_singleton`. * deprecate `dual_insert` since now obsolete (use `Submodule.span_insert` instead). * deprecate `dual_union`, `dual_iUnion` and `dual_sUnion` in favor of `dual_sup`, `dual_sSup` and `dual_iSup`. * remove `dual_sup` since now obsolete and name has been reused (see above). * add `dual_sup_ker` and `dual_univ_eq_ker` to align with (proposed) submodule analogue for `Submodule.orthogonalBilin`. * deprecate `dual_image` in favor of `dual_map` * add `hull_eq` (cone version of `span_eq`) since used in `basis_coord_mem_dual`. * adjust doc-strings Numerous changes to other files have been necessary. The dual-variants for proper cones or inner product spaces have not yet been adapted to cone-inputs, though this should happen eventually. The definition of `DualFG` has been changed to "duals of `FG`-cones" instead of "duals of finite sets" (also getting rid of `Finset` as previously requested). --- - [x] depends on: #37950 - [x] depends on: #37542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		227/128	Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/TensorProduct.lean,Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/Geometry/Convex/Cone/DualFinite.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean	7	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-24571 7 days ago	7-24610 7 days ago	20-30731 20 days
37299	XC0R author:XC0R	feat(NumberTheory): Chebyshev's lower bound on primorial	## Summary Prove `primorial(n) ≥ 2^(n/2)` for all `n ≥ 2` (Chebyshev's 1852 lower bound). This is the lower bound complement to `primorial_le_four_pow`. Addresses the TODO at `Chebyshev.lean` line 50: "Prove Chebyshev's lower bound." ### New file: `Mathlib/NumberTheory/PrimorialLowerBound.lean` Main theorems: - `two_pow_le_primorial`: `2 ^ n ≤ primorial (2 * n)` for `n ≥ 29` - `two_pow_div_two_le_primorial`: `2 ^ (n / 2) ≤ primorial n` for `n ≥ 2` Key intermediates: - `centralBinom_le_pow_mul_primorial`: `C(2n,n) ≤ (2n)^{π(√(2n)+1)} * primorial(2n)` - `eight_mul_sq_add_le_two_pow`: `8u² + 16u + 8 ≤ 2^u` for `u ≥ 10` ### Proof technique Central binomial decomposition: from `four_pow_lt_mul_centralBinom` and `factorization_choose_le_log`, bound `C(2n,n)` above by `(2n)^{π(√(2n)+1)} * primorial(2n)`. Rearranging gives `primorial(2n) ≥ 2^n` for `n ≥ 29`. Base cases by `norm_num` + `decide`, large `n` analytically via `√n` factoring. ### AI disclosure Claude (Anthropic) was used as a coding assistant for Lean tactic exploration, file structuring, and CI debugging. All proof strategy, mathematical content, and final code have been reviewed and are understood by the author.	t-number-theory new-contributor awaiting-author	226/2	Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Primorial.lean	2	53	['MichaelStollBayreuth', 'Parcly-Taxel', 'XC0R', 'github-actions', 'mathlib-merge-conflicts', 'wwylele']	MichaelStollBayreuth assignee:MichaelStollBayreuth	7-22655 7 days ago	38-34758 38 days ago	13-62238 13 days
31580	grunweg author:grunweg	feat: towards `ContMDiff` support in fun_prop	Create a `find_model` tactic for solving `ModelWithCorners k E H` goals, and a #find_model command to simplify testing it. (Both implementations are a bit hacky right now.) next step: extend the tactic, test that it works well then try to hook it up to fun_prop --- - [x] depends on: #30463 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry merge-conflict t-meta	1254/64	Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/TestFunPropM.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,mathlib-immersions	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	7-21401 7 days ago	186-70496 186 days ago	0-1 1 second
39225	junodeveloper author:junodeveloper	feat(SimpleGraph): add odd degree corollaries	This PR adds three small corollaries of the handshaking lemma for odd-degree vertices in `SimpleGraph`: * `card_odd_degree_vertices_ne_one` * `not_existsUnique_odd_degree` * `even_degree_of_forall_ne_even_degree` These are convenience lemmas around the existing `even_card_odd_degree_vertices` / `exists_ne_odd_degree_of_exists_odd_degree` API. Local checks: ```bash lake build Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe lint-style Mathlib.Combinatorics.SimpleGraph.DegreeSum lake exe runLinter Mathlib.Combinatorics.SimpleGraph.DegreeSum ``` ## AI usage disclosure I used OpenClaw/Codex to help explore the existing API, draft the small proofs, and run local checks. I reviewed the final code myself and understand the statements and proofs in this PR.	t-combinatorics new-contributor	21/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean	1	2	['github-actions']	nobody	7-21131 7 days ago	7-22463 7 days ago	7-22456 7 days
33477	mcdoll author:mcdoll	refactor(Algebra): add type-classes for algebraic properties of `FunLike`	--- Zulip discussion: [#mathlib4 > Refactoring algebraic properties of bundled maps](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactoring.20algebraic.20properties.20of.20bundled.20maps/with/566142461) - [ ] depends on: #37779 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	1782/897	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Central/End.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExactSequences.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexCohomology.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/EngelSubalgebra.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Lie/Weights/Cartan.lean,Mathlib/Algebra/Lie/Weights/IsSimple.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/MvPolynomial/NoZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Conformal.lean	266	8	['github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'mcdoll', 'plp127']	nobody	7-20179 7 days ago	unknown	0-0 0 seconds
38348	mirajcs author:mirajcs	feat(Geometry/Curve): add Frenet–Serret framework	--- This PR introduces a basic formalization of smooth parametrized curves in `ℝ³` (`EuclideanSpace ℝ (Fin 3)`) together with the Frenet frame and partial proofs of the Frenet–Serret formulas. Main contributions: * Define `ParametrizedDifferentiableCurve` as a smooth map on an open interval. * Define arc length and arc-length parametrization. * Define geometric quantities: - curvature `κ(t) = ‖α''(t)‖` - tangent, normal, and binormal vector fields - torsion via `‖B'(t)‖` * Introduce the `FrenetFrame` structure. * Prove key Frenet–Serret formulas: - `T' = κ • N` - `B' = -τ • N` - `N' = -κ • T + τ • B` The implementation relies on existing analysis and inner product space infrastructure, as well as properties of the cross product in `ℝ³`. Some intermediate lemmas about orthogonality and cross-product identities are included. At present, some results assume nonvanishing curvature/torsion and include auxiliary hypotheses about derivatives. These can be streamlined in future work. This development is intended as a foundation for further formalization of classical differential geometry (curves and surfaces). ---	new-contributor t-differential-geometry awaiting-author	525/0	Mathlib.lean,Mathlib/Geometry/Curves/Basic.lean,Mathlib/Geometry/Curves/FrenetFrame.lean	3	18	['bryangingechen', 'github-actions', 'mathlib-merge-conflicts', 'mirajcs', 'ocfnash', 'vihdzp', 'wwylele']	ocfnash assignee:ocfnash	7-20053 7 days ago	20-43145 20 days ago	6-55291 6 days
36868	ADedecker author:ADedecker	feat: Fréchet derivative of distributions, as a CLM	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	409/30	Mathlib.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Topology/Algebra/Module/Spaces/FiniteDimensionCLM.lean	4	3	['github-actions', 'mathlib-merge-conflicts']	nobody	7-18987 7 days ago	unknown	0-0 0 seconds
36922	SnirBroshi author:SnirBroshi	feat(Data/List/Chain): generalize `WellFounded.asymmetric₃` to chains	The existing `WellFounded.asymmetric` shows `r a b → ¬r b a`, and `WellFounded.asymmetric₃` shows `r a b → r b c → ¬r c a`. This adds `WellFounded.asymmetricₙ` which shows `l.IsChain r → ¬r l.getLast l.head`. --- Also adds a couple of `IsChain` lemmas which might be useful. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	29/8	Mathlib/Data/List/Chain.lean	1	4	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	eric-wieser assignee:eric-wieser	7-12796 7 days ago	54-53698 54 days ago	59-3367 59 days
38483	jessealama author:jessealama	feat(Algebra/BigOperators): add `Antiperiodic.sum_Ico_shift`	Three lemmas about `Finset` sums of `Function.Antiperiodic` functions: `sum_map_add_right` says that for `f` antiperiodic with antiperiod `c`, summing `f` over a `Finset` shifted by `c` (via `addRightEmbedding c`) negates the sum over the original; `sum_Ico_shift` is the half-open-interval specialization, immediate via `Finset.map_add_right_Ico`; and `sum_Ico_mul_add_sum_Ico_mul_shift_eq_zero` is a bilinear cancellation variant. Spun off from #29713 (Euler-Poincaré formula), where the bilinear form is used.	t-algebra label:t-algebra$	63/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Periodic.lean	2	5	['github-actions', 'j-loreaux', 'jessealama', 'wwylele']	ocfnash assignee:ocfnash	7-12793 7 days ago	13-79670 13 days ago	23-52694 23 days
38548	adomasbaliuka author:adomasbaliuka	feat(Algebra/Ring/BooleanRing): definitional lemmas for `Bool` ring operations	Mathlib defines a ring structure on `Bool` but is missing definitional lemmas for the arithmetic operations. --- Discussed on Zulip ([#Is there code for X? > `Bool.xor` same as `+` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.60Bool.2Exor.60.20same.20as.20.60.2B.60/near/590927417)), in particular, it's not immediately intuitive to everyone what the operations do. Note that the parentheses around `^^` and `&&` are needed due to operator precedence w.r.t. `=`, see also https://github.com/leanprover-community/mathlib4/pull/38539. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	12/0	Mathlib/Algebra/Ring/BooleanRing.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	7-12792 7 days ago	22-52256 22 days ago	22-52249 22 days
38622	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/ExponentialModule): add exponential module	Let `R` be a commutative ring. The exponential module of `R` is the set of all power series `f : R⟦X⟧` that are of exponential type : `f (X + Y) = f X * f Y` where `X` and `Y` are two indeterminates. It is an abelian group under multiplication, and an `R`-module under rescaling. Co-authored by: @AntoineChambert-Loir --- - [ ] depends on: #38615 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	425/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Data/Nat/Choose/Sum.lean,Mathlib/RingTheory/PowerSeries/ExponentialModule.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	5	2	['github-actions', 'mathlib-dependent-issues']	alreadydone assignee:alreadydone	7-12791 7 days ago	19-54519 19 days ago	19-55609 19 days
38707	tb65536 author:tb65536	feat(Algebra/Polynomial/Lifts): add `natDegree` verison of `exists_natDegree_eq_of_mem_lifts`	This PR adds a `natDegree` version of `exists_degree_eq_of_mem_lifts`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	4/0	Mathlib/Algebra/Polynomial/Lifts.lean	1	1	['github-actions']	alreadydone assignee:alreadydone	7-12790 7 days ago	19-57594 19 days ago	19-57588 19 days
38708	tb65536 author:tb65536	feat(Algebra/Polynomial/Lifts): every polynomial lifts along a surjective ring homomorphism	This PR adds a lemma stating that every polynomial lifts along a surjective ring homomorphism (this could also be phrased as `lifts_eq_top`, but in practice it's membership in lifts that unlocks all of the API for `lifts`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	3/0	Mathlib/Algebra/Polynomial/Lifts.lean	1	1	['github-actions']	mariainesdff assignee:mariainesdff	7-12789 7 days ago	19-57345 19 days ago	19-57340 19 days
38741	eric-wieser author:eric-wieser	feat: Nat.card lemmas for Sym and Sym2	These are just translations of the `Fintype` counterparts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	109/7	Mathlib.lean,Mathlib/Data/Sym/Card.lean,Mathlib/Data/Sym/NatCard.lean,Mathlib/Data/Sym/Sym2.lean	4	18	['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions']	TwoFX assignee:TwoFX	7-12787 7 days ago	11-15970 11 days ago	17-33121 17 days
39011	Vierkantor author:Vierkantor	chore(Algebra/Polynomial/Module): workaround for backward.inferInstanceAs	This PR, like #38990, works around a `backward.inferInstanceAs` compatibility flag introduced by identifying `PolynomialModule` with `Finsupp` in our definitions. We introduce a new dsimp lemma `funLike_eq` that transfers the `FunLike` instances, and now we can use `PolynomialModule`'s `FunLike` instance, instead of the custom `CoeFun` instance. This is not a great approach, but it seems the least painful for the short term. The alternative would be to strictly enforce the defeq barrier between `PolynomialModule` and `Finsupp`, which would mean a substantial rewrite of this corner of Mathlib. We can't make `PolynomialModule` an `@[implicit_reducible]`, because we need different multiplication on it than `Finsupp` has. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt label:t-algebra$	8/5	Mathlib/Algebra/Polynomial/Module/Basic.lean	1	1	['github-actions']	jcommelin assignee:jcommelin	7-12779 7 days ago	12-41730 12 days ago	12-41723 12 days
39162	anovickis author:anovickis	feat(Topology/PartitionOfUnity): add pointwise_decomposition_finsum + companions	Add three short lemmas to `Mathlib/Topology/PartitionOfUnity.lean` extending the existing `PartitionOfUnity` API: - `pointwise_decomposition_finsum` — for `f : X → ℝ` and `x ∈ s`, `f x = ∑ᶠ i, ρ i x · f x`. This is the pointwise step that lifts to integral linearity in measure-theoretic PoU integration: `∫_s f dμ = ∑ᶠ i, ∫_s (ρ i · f) dμ`. - `one_minus_sum_nonneg` — `0 ≤ 1 - ∑ᶠ i, ρ i x`. Direct rearrangement of the existing `sum_le_one` field; useful as a complement-mass remainder bound in chart-by-chart estimates. - `abs_le_one` — `\|ρ i x\| ≤ 1`. Combines the existing `nonneg` and `le_one`; convenience for absolute-value bounds. All three are short proofs using existing structure fields (`sum_eq_one`, `sum_le_one`, `nonneg`, `le_one`). These came up while writing chart-by-chart Stokes-on-manifold estimates where one wants to decompose `∫_M f` into chart-supported pieces using a partition of unity. The pointwise identity is the obvious first step; the other two are complementary algebraic bounds that show up in remainder estimates. --- 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-topology new-contributor LLM-generated	27/0	Mathlib/Topology/PartitionOfUnity.lean	1	2	['github-actions']	urkud assignee:urkud	7-12772 7 days ago	8-8693 8 days ago	8-8686 8 days
39171	yuanyi-350 author:yuanyi-350	refactor(Analysis): golf `Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Asymptotic`	- shortens `one_isLittleO_logCounting_single` by deriving it from a theta estimate for `log r - log ‖e‖` - shortens `logCounting_isBigO_one_iff_analyticOnNhd` by reusing `divisor_nonneg_iff_analyticOnNhd` directly Extracted from #37968 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-analysis LLM-generated	10/34	Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Asymptotic.lean	1	2	['github-actions', 'yuanyi-350']	ADedecker assignee:ADedecker	7-12770 7 days ago	7-73963 7 days ago	7-73956 7 days
39176	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Integral/Marginal`	- refactors `Mathlib/MeasureTheory/Integral/Marginal` by shortening `Measurable.lmarginal` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	2/7	Mathlib/MeasureTheory/Integral/Marginal.lean	1	2	['github-actions', 'yuanyi-350']	RemyDegenne assignee:RemyDegenne	7-12764 7 days ago	7-73946 7 days ago	7-73939 7 days
39102	yuanyi-350 author:yuanyi-350	chore: reduce imports in 50 files	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	70/81	Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Deriv.lean,Mathlib/Analysis/Distribution/Sobolev.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/LocallyConvex/Montel.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/LocallyConvex/SeparatingDual.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Affine/AddTorsorBases.lean,Mathlib/Analysis/Normed/Affine/Convex.lean,Mathlib/Analysis/Normed/Algebra/Basic.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Field/Dense.lean,Mathlib/Analysis/Normed/Field/Instances.lean,Mathlib/Analysis/Normed/Field/Ultra.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Bounded.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/Normed/Group/FunctionSeries.lean,Mathlib/Analysis/Normed/Group/Indicator.lean,Mathlib/Analysis/Normed/Group/NullSubmodule.lean,Mathlib/Analysis/Normed/Group/Tannery.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/PSeriesComplex.lean,Mathlib/Analysis/SpecificLimits/Fibonacci.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/Subadditive.lean,Mathlib/Analysis/SumIntegralComparisons.lean	48	12	['JovanGerb', 'YaelDillies', 'bryangingechen', 'github-actions', 'j-loreaux', 'leanprover-radar', 'yuanyi-350']	j-loreaux assignee:j-loreaux	7-11346 7 days ago	9-65959 9 days ago	9-79171 9 days
39212	emlis42 author:emlis42	feat(Algebra/ContinuedFractions): add `partNums!` and `partDens!`	This PR adds `partNums!` and `partDens!`, which provide infinite stream representations for the sequences of partial numerators and denominators of a generalized continued fraction.	t-algebra new-contributor label:t-algebra$	8/0	Mathlib/Algebra/ContinuedFractions/Basic.lean	1	4	['emlis42', 'github-actions', 'grunweg']	nobody	7-9733 7 days ago	7-42452 7 days ago	7-42445 7 days
36559	faenuccio author:faenuccio	feat(Analysis/Convex/Uniform): uniformly convex spaces using filters	This PR adds an equivalent formulation for a space being uniformly convex using filters. Co-authored-by: Aristotle (Harmonic)	WIP t-analysis	205/2	Mathlib/Analysis/Convex/Uniform.lean	1	1	['github-actions']	faenuccio assignee:faenuccio	7-7130 7 days ago	67-30883 67 days ago	0-20 20 seconds
39232	jerwaynejones author:jerwaynejones	feat(Analysis/Complex): residue theorem for rectangular contours	Adds `Mathlib/Analysis/Complex/RectangleResidue.lean` (644 LoC), filling the gap between Cauchy–Goursat for rectangles (`Complex.integral_boundary_rect_eq_zero_of_differentiable_on_off_countable`) and the Cauchy integral formula for circles. The file proves the residue formula for rectangular boundary integrals together with a rotated principal log branch needed to evaluate the left-edge integral that crosses the standard cut. ## Why Mathlib has Cauchy–Goursat for rectangles and the Cauchy integral formula for circles, but no residue theorem for rectangular contours. This file fills that gap. It was extracted from a downstream Lean 4 formalization project (a conditional proof of Goldbach's conjecture, where contour shifting on rectangles arises naturally in Perron's formula). ## Main results - `Complex.hasDerivAt_log_neg` — the rotated logarithm `log_neg z := log (-z) + I * π` has derivative `z⁻¹` on the rotated slit plane `{z \| -z ∈ slitPlane}` (cut on the positive real axis). - `Complex.boundaryIntegral_inv_sub_eq_two_pi_I` — for `ρ` strictly inside the rectangle `[z, w]`, `∮_{∂[z,w]} (s − ρ)⁻¹ ds = 2πi`. - `Complex.boundaryIntegral_eq_residue_sum` — parametric residue theorem for a sum of simple poles plus a holomorphic remainder, packaged as `Complex.RectangleResidueData`. - `Complex.boundaryIntegral_single_pole` — the one-pole specialization. ## Structure The development proceeds in five stages: 1. A notation `Complex.boundaryIntegral` for the oriented boundary integral over `[z, w]`, with a Cauchy–Goursat wrapper and additivity/scaling lemmas. 2. A rotated principal logarithm `Complex.log_neg z := log (-z) + I * π` with cut on the positive real axis, plus its derivative and corner-comparison identities with the standard `Complex.log`. 3. Explicit FTC-based evaluations of the four edge integrals of `(s − ρ)⁻¹`. 4. A closed-form residue boundary integral `∮_{∂[z,w]} (s − ρ)⁻¹ ds = 2πi` for `ρ` strictly inside the rectangle. 5. A parametric residue theorem for sums of simple poles plus a holomorphic remainder, packaged as `Complex.RectangleResidueData`. ## References - L. Ahlfors, Complex Analysis (3rd ed.), §4.5. - E. Stein and R. Shakarchi, Complex Analysis, Ch. 2 §3 Thm 3.1. ## Status Draft while CI verifies the build against current `master` — the file was developed against `v4.28.0` and cherry-picked forward 2942 commits, so import surface changes are possible. Once CI is green I will flip to ready-for-review. 🤖 Generated with [Claude Code](https://claude.com/claude-code)	t-analysis new-contributor	644/0	Mathlib.lean,Mathlib/Analysis/Complex/RectangleResidue.lean	2	2	['github-actions']	nobody	6-80525 6 days ago	unknown	0-0 0 seconds
38334	8e7 author:8e7	feat(Combinatorics/SimpleGraph/TreeDecomp): define tree decompositions	Add definition for tree decompositions on simple graphs. Define the tree width of a simple graph and prove basic statements and conversions. ```lean structure TreeDecomp (G : SimpleGraph V) where /-- The type of bags in the tree. -/ W : Type u /-- The set of vertices in each bag. -/ 𝓧 : W → Finset V /-- The graph adjacency relation of bags. -/ T : SimpleGraph W /-- T must be a tree. -/ isTree : IsTree T /-- All vertices in G must appear in some bag. -/ vertexCover : ∀ v : V, ∃ w : W, v ∈ 𝓧 w /-- For any edge (u, v) in G, there is a bag containing both u and v. -/ edgeCover ⦃u v : V⦄ : G.Adj u v → ∃ w : W, u ∈ 𝓧 w ∧ v ∈ 𝓧 w /-- For any vertex v in G, the set of bags that contain v is preconnected. -/ connectedBags : ∀ v : V, (T.induce ({w \| v ∈ 𝓧 w})).Preconnected ``` AI Usage: Some proofs are written with the help of Claude Code, and everything has been manually reviewed. --- - [ ] depends on: #38027 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor help-wanted blocked-by-other-PR t-combinatorics LLM-generated WIP	396/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Star.lean,Mathlib/Combinatorics/SimpleGraph/TreeDecomp.lean	3	5	['8e7', 'github-actions', 'mathlib-dependent-issues']	nobody	6-77954 6 days ago	27-58276 27 days ago	0-356 5 minutes
33832	alreadydone author:alreadydone	feat(Algebra): localization preserves unique factorization	--- - [x] depends on: #33851 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	143/12	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/UniqueFactorization.lean,Mathlib/RingTheory/Localization/Defs.lean	6	13	['Vierkantor', 'alreadydone', 'dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	Vierkantor assignee:Vierkantor	6-70913 6 days ago	102-40807 102 days ago	15-81158 15 days
38369	quantumsnow author:quantumsnow	feat(AlgebraicTopology): Eilenberg Steenrod axioms	This introduces the Eilenberg-Steenrod axioms for a homology theory. --- - [x] depends on: #36621 - [ ] depends on: #39236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebraic-topology blocked-by-other-PR	365/0	Mathlib.lean,Mathlib/AlgebraicTopology/EilenbergSteenrod.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Category/TopPair.lean	4	37	['chrisflav', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'quantumsnow']	nobody	6-70616 6 days ago	6-70617 6 days ago	3-44318 3 days
28013	astrainfinita author:astrainfinita	feat: Lindemann-Weierstrass Theorem	This PR continues the work from #6718. -------- - [x] depends on: #18693 - [x] depends on: #29121 - [x] depends on: #36762 - [x] depends on: #37797 - [x] depends on: #37811	t-algebra t-analysis awaiting-author label:t-algebra$	1076/64	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Data/Finsupp/Quotient.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AlgebraicPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AnalyticalPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/Basic.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Eval.lean,docs/100.yaml,docs/1000.yaml	10	33	['astrainfinita', 'github-actions', 'grunweg', 'j-loreaux', 'jcommelin', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot', 'mathlib4-merge-conflict-bot']	nobody	6-69557 6 days ago	183-25634 183 days ago	3-86310 3 days
39239	alainchmt author:alainchmt	feat(FieldTheory/Finite): irreducible polynomial divides X^q^n - X iff degree divides n	--- Add the theorem saying that, for an irreducible polynomial `f` over a finite field `K`, the degree of `f` divides `n` if and only if `f` divides `X ^ (Nat.card K) ^ n - X`. Include auxiliary lemmas. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	34/0	Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Minpoly/Field.lean	2	2	['github-actions']	nobody	6-68345 6 days ago	6-68434 6 days ago	6-68427 6 days
38189	artie2000 author:artie2000	feat: simplify proof of `IsAdjoinRootMonic.mkOfAdjoinEqTop'`	* Simplify the proof of `IsAdjoinRootMonic.mkOfAdjoinEqTop'` by factoring out a lemma `OrzechProperty.bijective_of_surjective_of_finrank_le` and making use of the existing lemma `finrank_le_iff_exists_linearMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory delegated	22/21	Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/RingTheory/IsAdjoinRoot.lean	2	8	['Vierkantor', 'artie2000', 'github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	6-66114 6 days ago	6-66114 6 days ago	24-41408 24 days
39248	grunweg author:grunweg	dev: lint modules with just one exposed def, to manually inspect	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	50/9	Mathlib/CategoryTheory/MarkovCategory/Positive.lean,Mathlib/Tactic/Linter/PrivateModule.lean,MathlibTest/PrivateModuleLinter/hasOnlyPrivateNoDefs.lean	3	2	['github-actions']	nobody	6-63349 6 days ago	6-63426 6 days ago	0-8 8 seconds
38375	WenrongZou author:WenrongZou	feat(MvPowerSeries): some lemmas `truncTotal` of `subst`	This PR adds some lemmas about truncation of total degree of a substitution. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	158/7	Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean	2	3	['BryceT233', 'github-actions']	joneugster assignee:joneugster	6-63266 6 days ago	6-63353 6 days ago	26-47460 26 days
39164	allenhaozhu author:allenhaozhu	feat(Probability/Distance): add total variation distance `tvDist`	Add `MeasureTheory.tvDist : Measure α → Measure α → ℝ≥0∞`, the total variation distance between two measures, defined via the truncated subtraction `μ - ν` already in `Mathlib.MeasureTheory.Measure.Sub`. Add four basic lemmas (`tvDist_self`, `tvDist_comm`, `tvDist_nonneg`, `tvDist_le_one`) and a bridge lemma `tvDist_eq_signedMeasure_totalVariation` connecting `tvDist` to the existing `MeasureTheory.SignedMeasure.totalVariation` for finite measures. --- ## AI-assistance disclosure Per the Mathlib [AI-use policy](https://leanprover-community.github.io/contribute/index.html#use-of-ai): - Tool. Claude Code (Anthropic) with the Claude Sonnet 4.6 model. - Use. I specified the target lemma statements and the proof strategy; the assistant drafted Lean 4 tactic combinations against current Mathlib. I iterated on the proofs, verified each lemma builds under `lake build` from a clean checkout, and read the final code. - Vouching. I have read every declaration in this file and can defend the proofs without further AI assistance. I welcome reviewer feedback on naming, namespace placement, and stylistic alignment with the surrounding Mathlib modules.	t-measure-probability new-contributor LLM-generated awaiting-author	187/0	Mathlib.lean,Mathlib/Probability/Distance/TotalVariation.lean	2	4	['allenhaozhu', 'github-actions', 'grunweg']	nobody	6-59949 6 days ago	7-69583 7 days ago	0-2707 45 minutes
39165	allenhaozhu author:allenhaozhu	feat(Probability/Moments): add IsSubExponential class	Add `ProbabilityTheory.IsSubExponential X μ ν b`, the sub-exponential random variable class: `mgf X μ s ≤ exp (s²ν/2)` for `\|s\| < 1/b`. Mirror the structure of the existing `Mathlib/Probability/Moments/SubGaussian.lean`. Include constructor lemmas (`IsSubExponential.const`, `mono_b`, `mono_nu`) and a tail bound derived through Mathlib's `measure_ge_le_exp_mul_mgf`. --- ## AI-assistance disclosure Per the Mathlib [AI-use policy](https://leanprover-community.github.io/contribute/index.html#use-of-ai): - Tool. Claude Code (Anthropic) with the Claude Sonnet 4.6 model. - Use. I specified the target lemma statements and the proof strategy; the assistant drafted Lean 4 tactic combinations against current Mathlib. I iterated on the proofs, verified each lemma builds under `lake build` from a clean checkout, and read the final code. - Vouching. I have read every declaration in this file and can defend the proofs without further AI assistance. I welcome reviewer feedback on naming, namespace placement, and stylistic alignment with the surrounding Mathlib modules.	t-measure-probability new-contributor LLM-generated awaiting-author	257/0	Mathlib.lean,Mathlib/Probability/Moments/SubExponential.lean	2	4	['allenhaozhu', 'github-actions', 'grunweg']	nobody	6-59948 6 days ago	7-69591 7 days ago	0-2698 44 minutes
39168	allenhaozhu author:allenhaozhu	feat(Analysis/Convex/Subgradient): add subgradient characterization for \|·\| and ℓ¹	Add `Convex.IsAbsSubgradient x g`, the predicate that `g` is a subgradient of `\|·\|` at `x`. Prove the standard characterization: the only subgradient at `x > 0` is `1`; at `x < 0` it is `-1`; at `x = 0` the subgradients are exactly `[-1, 1]`. Add `IsL1Subgradient`, the componentwise lift to `Fin n → ℝ` used by ℓ¹-regularized estimation (Lasso KKT). --- ## AI-assistance disclosure Per the Mathlib [AI-use policy](https://leanprover-community.github.io/contribute/index.html#use-of-ai): - Tool. Claude Code (Anthropic) with the Claude Sonnet 4.6 model. - Use. I specified the target lemma statements and the proof strategy; the assistant drafted Lean 4 tactic combinations against current Mathlib. I iterated on the proofs, verified each lemma builds under `lake build` from a clean checkout, and read the final code. - Vouching. I have read every declaration in this file and can defend the proofs without further AI assistance. I welcome reviewer feedback on naming, namespace placement, and stylistic alignment with the surrounding Mathlib modules.	t-analysis new-contributor LLM-generated awaiting-author	231/0	Mathlib.lean,Mathlib/Analysis/Convex/Subgradient/Abs.lean	2	4	['allenhaozhu', 'github-actions', 'grunweg']	nobody	6-59946 6 days ago	7-69676 7 days ago	0-2608 43 minutes
36376	jessealama author:jessealama	feat(SimpleGraph): hamiltonian cycle from cyclic permutation	This PR provides `IsHamiltonian.of_perm`, a bridge from `Equiv.Perm.IsCycle` to `SimpleGraph.IsHamiltonian`: if σ is a permutation that is a single cycle with full support on at least 3 elements, and each step `v → σ v` is an edge of `G`, then `G` is Hamiltonian. ### New definitions and lemmas `Mathlib/Data/List/Chain.lean`: - `IsChain.iterate`: `List.iterate f a n` is a chain under `r` whenever `r a (f a)` holds for all `a` `Mathlib/Data/List/Iterate.lean`: - `getLast_iterate`: the last element of `List.iterate f a n` is `f^[n - 1] a` `Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean` (new file): - `Walk.iterate`: builds a walk of length `n` from `x` to `f^[n] x` for any function `f` with `G.Adj x (f x)` for all `x`, defined via `Walk.ofSupport` - `Walk.length_iterate`, `Walk.support_iterate`, `Walk.edges_iterate`: basic API `Mathlib/GroupTheory/Perm/Cycle/Basic.lean`: - `IsCycleOn.injOn_pow_apply`: the map `n ↦ (f ^ n) a` is injective on `Finset.range #s` `Mathlib/GroupTheory/Perm/Cycle/Concrete.lean`: - `IsCycleOn.injOn_sym2_pow_apply`: the unordered-pair edge map `k ↦ s((f ^ k) a, (f ^ (k + 1)) a)` is injective on `[0, #s)` when `#s ≠ 2` - `IsCycleOn.sym2_pow_apply_ne`: edge distinctness for cycle-on permutations — `s((f ^ k) a, (f ^ (k + 1)) a) ≠ s(a, f a)` when `k ≠ 0`, `k < #s`, and `#s ≠ 2` - `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers `Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`: - `cons_isHamiltonianCycle_iff`: a Hamiltonian path closed by an edge outside its support is a Hamiltonian cycle, and conversely - `IsHamiltonian.of_perm`: the main theorem --- - [x] depends on: #36307	t-combinatorics maintainer-merge	182/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian/Perm.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Iterate.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	8	76	['SnirBroshi', 'YaelDillies', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	6-58528 6 days ago	6-55268 6 days ago	44-17401 44 days
39195	linesthatinterlace author:linesthatinterlace	feat(Logic/Function/Defs): Add dcomp lemmas	This PR adds API lemmas about `dcomp` that were previously missing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	13/0	Mathlib/Logic/Function/Defs.lean	1	6	['github-actions', 'linesthatinterlace', 'plp127']	nobody	6-57604 6 days ago	7-59103 7 days ago	7-59096 7 days
38908	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): API lemmas for level-1 graded ring	Adds API lemmas extracted from #38813 to keep that PR reviewable: `DirectSum.of_eq_of_eq`, `DirectSum.of_eq_sub_add_smul`, `ModularForm.cast_apply`, `ModularForm.mul_ne_zero`, `ModularForm.sub_smul_isCuspForm`.	LLM-generated	41/0	Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	5	3	['CBirkbeck', 'github-actions', 'mathlib-merge-conflicts']	nobody	6-52306 6 days ago	unknown	0-0 0 seconds
38909	CBirkbeck author:CBirkbeck	feat(RingTheory/MvPolynomial/WeightedHomogeneous): sub, eq_zero_of_no_monomials, eq_monomial_of_unique_weight	Adds three weighted-homogeneous API lemmas extracted from #38813 to keep that PR reviewable: `IsWeightedHomogeneous.sub`, `eq_zero_of_no_monomials`, `eq_monomial_of_unique_weight`.	LLM-generated	25/0	Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	1	1	['github-actions']	nobody	6-52037 6 days ago	unknown	0-0 0 seconds
25427	Paul-Lez author:Paul-Lez	feat(Analysis/Calculus/PartialDerivatives): Propose notation for partial derivatives.	This PR introduces a notation for partial derivatives, taken with respect to a canonical basis. The idea here is that this might be useful for e.g. writing down PDEs. The notation allows use to write things like ```lean -- The canonical basis for `ℝ × ℝ` is indexed by `Fin 0` so `∂₀[ℝ]` corresponds to taking -- the first partial derivative example : (∂₀[ℝ] fun (x : ℝ × ℝ) => x.1) 0 = 1 := by simp [Pi.zero_def, lineDeriv] ``` This has already been discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives). I've opened this PR as a draft in order to get preliminary feedback on the contents (e.g. is this appropriate for Mathlib?); the file contains some demos of the notation in action. Co-authored-by: Eric Wieser --- - [ ] depends on: #25425 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	195/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivatives/Notation.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	3	16	['Paul-Lez', 'github-actions', 'leanprover-community-bot-assistant', 'lecopivo', 'mathlib-dependent-issues', 'ocfnash']	nobody	6-51619 6 days ago	unknown	0-0 0 seconds
39208	urkud author:urkud	chore(Algebra/Polynomial): golf	Use existing lemmas instead of reinventing the wheel. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	5/18	Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean	2	1	['github-actions']	nobody	6-48223 6 days ago	7-45729 7 days ago	7-45722 7 days
39258	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): E₄, E₆ surjectively map onto level-1 graded ring	Defines the evaluation homomorphism `evalE₄E₆ : ℂ[X₀, X₁] →ₐ[ℂ] ⨁ k, ModularForm 𝒮ℒ k` sending `X₀ ↦ E₄`, `X₁ ↦ E₆`, and proves it is surjective: every level-1 modular form is a polynomial in `E₄` and `E₆`. First half of the original PR #38813 (the injectivity argument + final equivalence lands in #38813 after this merges). ## Main results - `ModularForm.evalE₄E₆`: the evaluation homomorphism. - `ModularForm.evalE₄E₆_surjective`. - [ ] depends on: #38908 This PR was done with the help of Claude Code.	blocked-by-other-PR	321/0	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/GradedRing.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	6-48048 6 days ago	unknown	0-0 0 seconds
38813	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): E₄ and E₆ generate the graded ring of level-1 modular forms freely	Establishes that `E₄` and `E₆` are algebraically independent and generate the graded ring `⨁ k, ModularForm 𝒮ℒ k` of level-1 modular forms freely as a `ℂ`-algebra. The surjectivity half (the evaluation homomorphism `evalE₄E₆` and proof that every level-1 modular form is a polynomial in `E₄` and `E₆`) is split out into #39258. This PR adds injectivity and combines both into the algebra isomorphism. ## Main results - `ModularForm.evalE₄E₆_injective`: `evalE₄E₆` is injective (`E₄` and `E₆` are algebraically independent). - `ModularForm.modularFormsEquivMvPolynomial`: the algebra isomorphism `ℂ[X₀, X₁] ≃ₐ[ℂ] ⨁ k, ModularForm 𝒮ℒ k`. - `ModularForm.E₄E₆_generate`: `E₄, E₆` generate the graded ring as a `ℂ`-algebra. - [ ] depends on: #39258 (surjectivity) - [ ] depends on: #38909 (mvpolynomial weighted-homogeneous API) This PR was done with the help of Claude Code.	t-number-theory blocked-by-other-PR LLM-generated	814/0	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/GradedRing.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	8	9	['CBirkbeck', 'github-actions', 'mathlib-dependent-issues']	nobody	6-47960 6 days ago	unknown	0-0 0 seconds
33505	urkud author:urkud	feat(Analysis/Complex): prove Riemann mapping theorem	I'll list dependencies later. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		1115/99	Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/OfCompLeft.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/FDeriv.lean,Mathlib/Analysis/Complex/RiemannMapping.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/Algebra/Group/CompactOpen.lean	9	8	['SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	6-46785 6 days ago	unknown	0-0 0 seconds
38887	Rosario-Leonardi-CT author:Rosario-Leonardi-CT	feat(Analysis/Fourier/ZMod): add dft_star_comp	Adds `ZMod.dft_star_comp`, expressing that `𝓕 (star ∘ Φ) k = star (𝓕 Φ (-k))`, the discrete analogue of the Fourier transform's interaction with complex conjugation, complementing the existing `dft_comp_neg`. --- AI disclosure: lemma statement and proof drafted with assistance from Claude Code; verified by the Lean compiler with no `sorry` and standard axioms only (`propext`, `Classical.choice`, `Quot.sound`).	t-analysis new-contributor awaiting-author	9/0	Mathlib/Analysis/Fourier/ZMod.lean	1	8	['Rosario-Leonardi-CT', 'github-actions', 'wwylele']	j-loreaux assignee:j-loreaux	6-44944 6 days ago	10-38762 10 days ago	5-6447 5 days
35672	dennj author:dennj	feat(RingTheory/Polynomial/Cyclotomic): vanishing sums and fiber equidistribution at primitive roots	## Summary Building on `sum_eq_zero_iff_forall_eq` from #34592, this PR adds: - cyclotomic_dvd_of_aeval_eq_zero, exists_int_smul_cyclotomic_of_natDegree_le_totient — integer polynomials vanishing at a primitive n-th root are divisible by cyclotomic n ℤ, and (for degree ≤ φ(n)) integer multiples of it. - sum_eq_zero_iff_forall_eq and its ℤ / ZMod p variants — vanishing iff all coefficients equal. - sum_fiber_eq_sum_fiber_of_sum_weighted_pow_eq_zero, card_fiber_eq_card_div_of_sum_pow_eq_zero — fiber equidistribution. - cyclotomic_prime_coeff — the formula (cyclotomic p R).coeff i = if i < p then 1 else 0, generalising existing coeff_zero/coeff_one lemmas. - References: [deLauneyFlannery2011, Lemma 2.8.5] (underlying ℚ/ℕ fact) and [armario2024, Lemma 7 and Theorem 3] (ℤ statement and the fiber-counting application). Theorems imported from: https://github.com/Latinum-Agentic-Commerce/AlgebraicDesignTheory Human made PR with LLM used for documentation and proof golfing	t-ring-theory new-contributor LLM-generated	128/2	Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean,docs/references.bib	3	6	['dennj', 'github-actions', 'grunweg', 'ocfnash']	ocfnash assignee:ocfnash	6-40927 6 days ago	13-31268 13 days ago	31-45371 31 days
18551	joelriou author:joelriou	feat(AlgebraicGeometry): the algebraic De Rham complex	If `B` is an `A`-algebra, we construct the algebraic De Rham complex of `B` over `A`: it is a cochain complex of `A`-modules. --- - [ ] depends on: #18735 - [ ] depends on: #18662 - [ ] depends on: #26464 - [ ] depends on: #26465 - [x] depends on: #18534 - [x] depends on: #18440 - [x] depends on: #18432 - [x] depends on: #18408 - [x] depends on: #18389 - [x] depends on: #18374 - [x] depends on: #18359 - [x] depends on: #18332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR merge-conflict t-algebraic-geometry label:t-algebra$	2836/156	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/Cokernel.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/DirectSum.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/RestrictScalars.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/DeRham/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	26	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-40816 6 days ago	unknown	0-0 0 seconds
25848	joelriou author:joelriou	feat/refactor: redefinition of homology + derived categories	This PR contains a redefinition of homology, theorems about localization of categories, including triangulated categories, a construction of the derived category of an abelian category, derived functors, spectral sequences, etc. (This is made a PR only to facilitate navigation in the code of this branch.) This formalization is outlined in the paper _Formalization of derived categories in Lean/mathlib_ https://hal.science/hal-04546712 The homology of `ShortComplex C` (diagrams of two composable morphisms whose composition is zero) is developed in `Algebra.Homology.ShortComplex`. The files in that folder have been added one by one in separate PRs, and then, the current definition of `homology` has been replaced by this new definition in a refactor PR. Homology refactor: * #4203 * #4204 * #4388 * #4609 * #4645 * #4787 * #4853 * #5250 * #5674 * #6008 * #6039 * #6089 * #6227 * #6230 * #6231 * #6245 * #6267 * #6279 * #6324 * #6443 * #6586 * #6994 * #7042 * #7047 * #7052 * #7192 * #7193 * #7194 * #7195 * #7197 * #7256 * #7262 * #7280 * #7623 * #7624 * #7806 * #7816 * #7817 * #7821 * #7954 * #7966 * #7993 * #7995 * #7996 * #7997 * #8058 * #8060 * #8069 * #8079 * #8081 * #8084 * #8091 * #8113 * #8114 * #8152 * #8159 * #8174 * #8200 * #8206 * #8208 * #8472 * #8468 * #8475 * #8490 * #8491 * #8507 * #8512 * #8593 * #8595 * #8706 * #8765 * #8766 * #8845 * #9022 * #12649 * #12638 Homological complexes: * #9333 * #9335 * #9331 Localization of categories: * #6233 * #6235 * #6236 * #6867 * #6869 * #6887 * #6882 * #8041 * #8055 * #8069 * #8516 * #8864 * #8865 * #9702 * #9692 * #10606 * #10607 * #11721 * #11728 * #11737 * #12728 Shifts on categories: * #4429 * #6652 * #6653 * #6655 * #7268 * #7270 * #9001 * #11764 Triangulated categories: * #6377 * #6688 * #6815 * #7053 * #7324 * #7327 * #7336 * #7626 * #7641 * #9049 * #9073 * #10527 * #11738 * #11740 * #11759 * #11786 * #11789 * #11805 * #12619 Construction of the derived category: * #6626 * #6701 * #6720 * #6894 * #7048 * #7049 * #7050 * #7201 * #7656 * #8937 * #8966 * #8969 * #8970 * #9054 * #9447 * #8951 * #9483 * #9508 * #9509 * #9592 * #9614 * #9615 * #9032 * #9370 * #9550 * #9686 * #9660 * #11760 * #11782 * #11806 Derived functors: * #10195 * #10270 * #10301 * #10384 * #10413 * #12168 * #12627 * #12631 * #12633 * #12785 * #12788 Refactor of Ext-groups: * #12607 - [x] depends on: #24309 - [ ] depends on: #24275 - [x] depends on: #24191 - [ ] depends on: #23797 - [x] depends on: #22586 - [x] depends on: #22556 - [x] depends on: #22547 - [x] depends on: #22539 - [ ] depends on: #22508 - [x] depends on: #22450 - [ ] depends on: #23915 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #4197. Original PR: https://github.com/leanprover-community/mathlib4/pull/4197	WIP t-category-theory large-import t-topology merge-conflict	31074/258	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/BicomplexColumns.lean,Mathlib/Algebra/Homology/BicomplexRows.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorColimits.lean,Mathlib/Algebra/Homology/BifunctorCommShift.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorMappingCone.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/BifunctorSingle.lean,Mathlib/Algebra/Homology/BifunctorTriangulated.lean,Mathlib/Algebra/Homology/CategoryWithHomology.lean,Mathlib/Algebra/Homology/CochainComplexMinus.lean,Mathlib/Algebra/Homology/CochainComplexOpposite.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ConnectShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureKInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/DerivedCategory/FullyFaithful.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/DerivedCategory/Minus.lean,Mathlib/Algebra/Homology/DerivedCategory/Monoidal.lean,Mathlib/Algebra/Homology/DerivedCategory/Plus.lean,Mathlib/Algebra/Homology/DerivedCategory/RightDerivedFunctorPlus.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/SpectralObject.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/DoubleHomology.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/CochainComplexTrunc.lean,Mathlib/Algebra/Homology/Embedding/ComplementaryTrunc.lean,Mathlib/Algebra/Homology/Embedding/ExtendMap.lean,Mathlib/Algebra/Homology/Embedding/HomEquiv.lean,Mathlib/Algebra/Homology/Embedding/StupidFiltration.lean,Mathlib/Algebra/Homology/Embedding/StupidTrunc.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/Embedding/TruncGEHomology.lean,Mathlib/Algebra/Homology/Embedding/TruncLE.lean,Mathlib/Algebra/Homology/Embedding/TruncLEHomology.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/Factorizations/CM5a.lean,Mathlib/Algebra/Homology/HomologicalBicomplex.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomologicalComplexFunctorEquiv.lean,Mathlib/Algebra/Homology/HomologicalComplexLimits.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/HomotopyCategory/Acyclic.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/Devissage.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/KInjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/Minus.lean,Mathlib/Algebra/Homology/HomotopyCategory/Monoidal.lean,Mathlib/Algebra/Homology/HomotopyCategory/MonoidalTriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Plus.lean,Mathlib/Algebra/Homology/HomotopyCategory/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Homology/HomotopyFiber.lean,Mathlib/Algebra/Homology/LeftResolution/Basic.lean,Mathlib/Algebra/Homology/LeftResolution/CochainComplex.lean,Mathlib/Algebra/Homology/LeftResolution/CochainComplexMinus.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/ModelCategory/Injective.lean,Mathlib/Algebra/Homology/ModelCategory/Projective.lean,Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/Algebra/Homology/ObjectProperty.lean,Mathlib/Algebra/Homology/Opposite.lean,Mathlib/Algebra/Homology/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/Algebra/Homology/ShortComplex/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/FiveLemma.lean,Mathlib/Algebra/Homology/ShortComplex/FourLemma.lean,Mathlib/Algebra/Homology/ShortComplex/HomologicalComplex.lean,Mathlib/Algebra/Homology/ShortComplex/Images.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/ShortComplexFive.lean,Mathlib/Algebra/Homology/ShortComplex/ShortComplexFour.lean,Mathlib/Algebra/Homology/ShortComplex/ULift.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/Algebra/Homology/SpectralObject/Convergence.lean	290	11	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	6-38631 6 days ago	339-40140 339 days ago	0-2 2 seconds
26464	joelriou author:joelriou	feat(LinearAlgebra): generators of pi tensor products	In this PR, we show that the `R`-module `⨂[R] i, M i` is finitely generated if the index type is finite and all `M i` are finitely generated. This follows from a more precise result about generators of `⨂[R] i, M i`. --- This PR continues the work from #18725. Original PR: https://github.com/leanprover-community/mathlib4/pull/18725	file-removed t-algebra label:t-algebra$	260/7	Mathlib.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/DFinsupp.lean,Mathlib/LinearAlgebra/PiTensorProduct/DirectSum.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorPower/Symmetric.lean,Mathlib/Logic/Equiv/Option.lean,Mathlib/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	13	35	['eric-wieser', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	mattrobball assignee:mattrobball	6-37790 6 days ago	6-44852 6 days ago	103-57673 103 days
27392	Paul-Lez author:Paul-Lez	feat(Tactic/SimpUtils): add simproc finding commands	This PR adds some commands to allow users to find simprocs/dsimprocs/simp theorems that match on a given pattern. Thanks to Robin Arnez for telling me about `simprocDeclExt` :) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	173/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimpUtils.lean,MathlibTest/SimpUtils.lean	4	14	['Paul-Lez', 'Vierkantor', 'eric-wieser', 'github-actions', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	6-37371 6 days ago	298-56698 298 days ago	0-5960 1 hour
39255	jcommelin author:jcommelin	chore(Tactic): abstract over Stacks attribute, add Wikidata attribute	This PR abstracts some of the functionality that sets up the Stacks attribute, and uses the new abstraction to add a Wikidata attribute. Co-authored with Claude Code. --- - [x] depends on: #39257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed LLM-generated merge-conflict	349/257	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CrossRefAttribute.lean,Mathlib/Tactic/StacksAttribute.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/JacobsonSpace.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/Spectral/Hom.lean,MathlibTest/CrossRefAttribute.lean,scripts/noshake.json	14	3	['github-actions', 'grunweg', 'mathlib-dependent-issues']	nobody	6-32219 6 days ago	unknown	0-0 0 seconds
39254	urkud author:urkud	feat: define contour integrals	Specialize `curveIntegral` to the case if the domain is `ℂ`. In this case, we can integrate a function, not a 1-form. I've decided not to specialize `HasFDerivWithinAt` etc theorems, because I want to review API for curve integrals first. This PR was written at ICERM meeting. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	255/4	Mathlib.lean,Mathlib/MeasureTheory/Integral/ContourIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/CurveIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	5	1	['github-actions']	nobody	6-28156 6 days ago	6-46955 6 days ago	0-1607 26 minutes
39267	MichaelStollBayreuth author:MichaelStollBayreuth	perf: increase some instance priorities	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	43/19	Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Data/Nat/Choose/Vandermonde.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/RingTheory/Extension/Cotangent/BaseChange.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/Topology/Algebra/Polynomial.lean	14	1	['github-actions']	nobody	6-25494 6 days ago	6-33011 6 days ago	0-1 1 second
34288	winstonyin author:winstonyin	feat: Integral curve is smooth in initial condition	I prove the local smoothness theorem for integral curves of ODEs on Banach spaces with respect to the initial condition. Serge Lang's _Fundamentals of Differential Geometry_ gives two proofs (Theorem 1.11). The first one is based on Grönwall's inequality. The second one (p. 81 onwards) is based on the implicit function theorem, found by Pugh and Robbin 1968. I've chosen to formalise the second, even though it may be more involved. I wanted to do this as a challenge, and because the second proof also applies to $H^k$ vector fields (Ebin and Marsden 1970), which are not yet in Mathlib. I am open to splitting this up into several smaller PRs. ## Statement Let $f : E \to E$ be a vector field that is $C^n$ at $x_0 : E$ with $n \geq 1$. There exists a neighbourhood $U$ of $x_0$ and time interval $[t_{\mathrm{min}},t_{\mathrm{max}}]$ containing $t_0$ such that for every $x \in U$, there exists an integral curve $\alpha_x : C([t_{\mathrm{min}},t_{\mathrm{max}}], E)$ of $f$ with initial condition $\alpha_x(t_0) = x$, and that $x \mapsto \alpha_x$ is $C^n$. Note that this is not the full smoothness theorem for local flows, which states that the local flow $\alpha : [t_{\mathrm{min}},t_{\mathrm{max}}] \times U \to E$ is $C^n$ at $(t_0, x_0)$. We will prove this in a series of future PRs. ## Proof strategy * Define implicit equation $T_f : E \times C([t_{\mathrm{min}},t_{\mathrm{max}}],E) \to C([t_{\mathrm{min}},t_{\mathrm{max}}],E)$ so that $T(x,\alpha) = 0$ implies that $\alpha$ is an integral curve of $f$ with initial condition $x$. * Prove implicit equation is $C^n$ if $f$ is $C^n$. * Prove $\partial_\alpha T_f$ is invertible for some choice of $[t_{\mathrm{min}},t_{\mathrm{max}}]$. * Extract the local flow $(x : E) \mapsto (\alpha_x : C([t_{\mathrm{min}},t_{\mathrm{max}}],E))$ as the implicit function of $T_f$ around a known integral curve. * Conclude that $x \mapsto \alpha_x$ is $C^n$. ## For reviewers * Where should `Set.Icc.abs_sub_le` go? * Some proofs (marked with TODO) can be shortened after #34120, but I don't want it to be blocking. - [x] depends on: #34860 - [x] depends on: #34861 - [x] depends on: #34862 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	863/0	Mathlib.lean,Mathlib/Analysis/ODE/SmoothFlow.lean,Mathlib/Topology/MetricSpace/Pseudo/Lemmas.lean	3	8	['github-actions', 'idontgetoutmuch', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	6-25131 6 days ago	69-46416 69 days ago	14-50302 14 days
26394	winstonyin author:winstonyin	feat: existence of local flows on manifolds	This PR continues the work from #21777. Original PR: https://github.com/leanprover-community/mathlib4/pull/21777 Transfer the existence theorem of local flows on vector spaces to manifolds. The precise statement is: > If a vector field `v` on a manifold `M` is continuously differentiable at an interior point `x₀`, then for a given `t₀` there exists a neighbourhood `u` of `x₀`, a positive `ε`, and `γ : M → ℝ → M` such that `γ x` is an integral curve of `v` on `(t₀ - ε, t₀ + ε)` for all `x ∈ u`. This is powerful because all curves `γ x` (each with initial condition `x ∈ u`) share the same existence time interval `(t₀ - ε, t₀ + ε)`, rather than each curve having its own `ε`. This will allow us to show that $C^1$ vector fields on compact manifolds always have global integral curves / global flows. Any suggestions to shorten the proof or split out useful lemmas are welcome! - [x] depends on: #26392 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	138/61	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	3	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash', 'winstonyin']	ocfnash assignee:ocfnash	6-24756 6 days ago	6-24756 6 days ago	14-1555 14 days
39230	bryangingechen author:bryangingechen	chore: extract API from #38807 and golf	I wanted to understand why these two proofs in #38807 were long (and also play around more with the API in this corner of the library) so I walked through them with Claude Opus. prepared with Claude code	t-order LLM-generated	23/37	Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/DirSupClosed.lean	2	2	['github-actions', 'vihdzp']	nobody	6-21967 6 days ago	7-10203 7 days ago	7-10196 7 days
35043	winstonyin author:winstonyin	refactor(Analysis/ODE): restate existence and uniqueness using integral curve API	* Create `Mathlib/Analysis/ODE/ExistUnique.lean` to collect existence and uniqueness results for ODEs stated in terms of the integral curve API (`IsIntegralCurve`, `IsIntegralCurveOn`, `IsIntegralCurveAt`). * Move and restate the Picard-Lindelöf existence theorems from `PicardLindelof.lean` and the $C^1$ vector field results using `IsIntegralCurveOn`/`IsIntegralCurveAt` instead of raw `HasDerivWithinAt`/`HasDerivAt`. * Move and restate the Grönwall-based uniqueness theorems from `Gronwall.lean` using `IsIntegralCurveOn` with half-open intervals (`Ico`/`Ioc`) instead of `HasDerivWithinAt … (Ici t)`/`HasDerivWithinAt … (Iic t)`. * Rename uniqueness theorems to use dot notation on the integral curve types (e.g. `ODE_solution_unique_of_mem_Icc_right` becomes `IsIntegralCurveOn.eqOn_Icc_right`). * Add `IsIntegralCurveOn.eqOn_inter`: if two integral curves on preconnected sets `I` and `J` agree at a point in both sets, they agree on `I ∩ J`. * Add deprecation aliases for all renamed lemmas. - [ ] depends on: #29186 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	421/308	Mathlib.lean,Mathlib/Analysis/ODE/ExistUnique.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,docs/1000.yaml,docs/undergrad.yaml	7	8	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mcdoll', 'winstonyin']	sgouezel assignee:sgouezel	6-21694 6 days ago	6-21543 6 days ago	38-81258 38 days
32305	faenuccio author:faenuccio	feat: define Sobolev Spaces	Nothing to see yet. --- - [x] depends on: #32250 - [x] depends on: #31809 - [ ] depends on: #39217 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis large-import	2487/53	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Distribution/WeakDeriv.lean,Mathlib/Analysis/FunctionalSpaces/Sobolev/Basic.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean	7	8	['ADedecker', 'faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	6-18338 6 days ago	168-56653 168 days ago	0-2 2 seconds
38918	yuanyi-350 author:yuanyi-350	chore(CategoryTheory/Groupoid/FreeGroupoid): remove an erw	- rewrites `lift` by simplifying the quotient-lift compatibility condition with `simp only` - replaces the remaining `erw` chain with a direct rewrite through `Quiver.symmetrify_reverse` and `Groupoid.reverse_eq_inv` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated awaiting-author	5/3	Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean	1	2	['github-actions', 'loefflerd']	nobody	6-12282 6 days ago	6-12282 6 days ago	8-51714 8 days
39146	anovickis author:anovickis	feat(Analysis/CStarAlgebra/Matrix): CompactSpace instances for unitaryGroup and specialUnitaryGroup	Adds `CompactSpace` instances (and supporting `IsClosed` / `IsCompact` lemmas) for the matrix unitary and special unitary groups. The compactness follows from Heine-Borel applied to the entrywise sup norm: every unitary matrix has all entries bounded by `1` (via the existing `entry_norm_bound_of_unitary` lemma), and `Matrix n n 𝕜` is finite-dimensional, so `closed + bounded ⇒ compact`. ### New declarations - `isClosed_unitaryGroup`, `isCompact_unitaryGroup` - `instance Matrix.unitaryGroup.instCompactSpace` - `isClosed_specialUnitaryGroup`, `isCompact_specialUnitaryGroup` - `instance Matrix.specialUnitaryGroup.instCompactSpace` All placed inside the existing `EntrywiseSupNorm` section in `Mathlib/Analysis/CStarAlgebra/Matrix.lean`, so the `Matrix.Norms.Elementwise` scope used for the bound is already in scope. ### Motivation These instances enable downstream constructions of compact matrix Lie groups such as flag manifolds (e.g. SU(3)/T = F₂), where the quotient inherits compactness for free via `Quotient.compactSpace`. They also fill an obvious gap in the matrix-group API: `unitary R` is known to be closed, but compactness for `Matrix.unitaryGroup` was not previously available as an instance. Claude Code / Anthropic was used for generating the code, Verification was done with lake build, each lemma reviewed. Proofs came out of F2 mass gap lean library - so compile verified	t-analysis new-contributor awaiting-author	52/0	Mathlib/Analysis/CStarAlgebra/Matrix.lean	1	11	['anovickis', 'github-actions', 'j-loreaux', 'wwylele']	nobody	5-85292 5 days ago	8-28737 8 days ago	0-7559 2 hours
35415	joneugster author:joneugster	feat(Cache): enable partial cache in downstream projects	Migrated to fork from: #21238. Enable partial cache retrieval in downstream projects: `lake exe cache get MyProject.Basic` downloads only the relevant cache to build `MyProject/Basic.lean` --- ### Notes: - replaces: #21195 - should address: #8767 - should address: #20568 ### Completed: - [x] depends on: #21632 - [x] ~~depends on: #21663~~ - [x] depends on: #21666 - [x] depends on: #21701 - [x] depends on: #21703 - [x] depends on: #21704 - [x] depends on: #21705 - [x] depends on: #21707 - [x] depends on: #21711 - [x] depends on: #21750 - [x] depends on: #21815 - [x] depends on: #21816 - [x] depends on: #21817 - [x] depends on: #21818 - [x] depends on: #21822 - [x] depends on: #21830 - [x] depends on: #21848 - [x] depends on: #21834 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta awaiting-author	27/15	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	5	['github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-77328 5 days ago	14-440 14 days ago	44-79297 44 days
31187	loefflerd author:loefflerd	feat(NumberTheory/LSeries): Define the L-series of a modular form	Define the L-function of a modular form (showing it is meromorphic on C and agrees with the naive Dirichlet series for `re s` large). --- - [x] depends on: #30089	WIP t-number-theory	237/28	Mathlib.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/ModularForms/LFunction.lean	4	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-76851 5 days ago	197-47468 197 days ago	0-1 1 second
39256	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): add monotonicity lemma for LanguageOn	In Symbolic dynamics. Proof that the language of a set of configurations is monotone with respect to inclusion of configuration sets: X ⊆ Y → LanguageOn X U ⊆ LanguageOn Y U The proof is a direct unfolding of definitions: a pattern in the language of X comes from restricting some configuration x ∈ X, and inclusion X ⊆ Y allows the same witness to be used for Y. Related to issue #39252	t-dynamics new-contributor	9/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	3	['github-actions']	nobody	5-76495 5 days ago	6-51299 6 days ago	6-51292 6 days
39282	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): add union morphism lemma for LanguageOn	In symbolic dynamics. This PR proves that taking the language over a finite shape commutes with unions of configuration sets: $LanguageOn (X \cup Y) U = LanguageOn X U \cup LanguageOn Y U$ The proof is a direct unfolding of definitions: a pattern in the language of $X \cup Y$ comes from restricting a configuration $x ∈ X \cup Y$, and splitting on whether $x \in X$ or $x \in Y$ yields the corresponding inclusion in either $LanguageOn X U$ or $LanguageOn Y U$. The converse direction rebuilds a witness in $X \cup Y$ from either side of the union. Related to issue #39252	t-dynamics new-contributor	15/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	2	['github-actions']	nobody	5-76269 5 days ago	5-76354 5 days ago	5-76347 5 days
39136	vihdzp author:vihdzp	feat: more results on `Order.enum`	Most importantly, we prove that the enumerator function of a (cofinal) set is normal iff the set is closed (under non-empty suprema). --- - [ ] depends on: #38362 - [x] depends on: #39137 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR t-order	197/11	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean	6	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-73825 5 days ago	8-78203 8 days ago	0-308 5 minutes
39285	vihdzp author:vihdzp	feat: enumerator function of club set is normal	--- - [ ] depends on: #37677 - [ ] depends on: #39136 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR	361/11	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean	9	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-73493 5 days ago	5-73494 5 days ago	0-795 13 minutes
39233	linesthatinterlace author:linesthatinterlace	feat: `Pi.map` rename to `Function.map`	This PR renames `Pi.map` to `Function.map` and makes the changes necessary to support this. In particular this means that Mathlib.Logic.Function.Defs now only contains the Function namespace. Zulip thread: [#PR reviews > #39233 - rename Pi.map to Function.map @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2339233.20-.20rename.20Pi.2Emap.20to.20Function.2Emap/near/594605689) General discussion regarding the Pi namespace: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20Pi.20namespace/near/594782721 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	131/122	Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Control/Bifunctor.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Pi.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/RestrictedProduct/TopologicalSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NhdsWithin.lean	37	1	['github-actions']	nobody	5-72807 5 days ago	6-47486 6 days ago	0-7302 2 hours
37685	vihdzp author:vihdzp	feat: Fodor's lemma	We define stationary sets and prove Fodor's lemma, following the proof at Wikipedia. --- - [ ] depends on: #37677 - [ ] depends on: #38362 I'm surprised that this has a [Wikipedia article](https://en.wikipedia.org/wiki/Fodor%27s_lemma) but isn't listed in 1000.yaml. Is it just because the name has "lemma" instead of "theorem"? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order blocked-by-other-PR	386/0	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean	7	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	5-72792 5 days ago	43-1913 43 days ago	0-1337 22 minutes
38071	JovanGerb author:JovanGerb	feat(Convert): less aggressive congruence	This PR tries to make `convert` behave more predictably, disabling some of the aggressive congruence steps that `congr!` does. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	14/8	Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Tactic/Convert.lean	3	3	['Vierkantor', 'github-actions', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	5-71230 5 days ago	33-27793 33 days ago	0-4044 1 hour
36202	vihdzp author:vihdzp	feat: more theorems on the Cantor normal form	We also remove some redundant assumptions. Used in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	68/17	Mathlib/SetTheory/Ordinal/CantorNormalForm.lean	1	21	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	YaelDillies assignee:YaelDillies	5-70289 5 days ago	54-69838 54 days ago	73-61792 73 days
39294	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): prove LanguageOn monotonicity under intersection	In symbolic dynamics. This PR proves that taking the language over a finite shape is monotone with respect to intersections of configuration sets: ```math \mathrm{LanguageOn}(X \cap Y)\, U \subseteq \mathrm{LanguageOn}\, X\, U \cap \mathrm{LanguageOn}\, Y\, U ``` The proof is a direct unfolding of definitions: a pattern in the language of `X ∩ Y` comes from restricting a configuration `x ∈ X ∩ Y`. Since such an `x` belongs simultaneously to `X` and `Y`, the same restriction witness gives membership both in `LanguageOn X U` and in `LanguageOn Y U`, yielding membership in their intersection. Related to issue #39252	t-dynamics new-contributor	9/1	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	2	['github-actions']	nobody	5-67475 5 days ago	5-67558 5 days ago	5-67551 5 days
38869	TJHeeringa author:TJHeeringa	feat(Analysis/InnerProductSpace): Add instance for quotient of InnerProductSpace	--- Couldn't find the inner product space instance for a quotient of an inner product space. After confirming at [#Is there code for X? > Quotient of inner product space is inner product space](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Quotient.20of.20inner.20product.20space.20is.20inner.20product.20space/with/592464432), I made this PR. Defines an innerProductSpace instance on the quotient based on the isometry with the orthogonal complement, which is a closed subspace of the full space and thus has an innerProductSpace instance. AI usage: Didn't understand how to properly apply `quotient_norm_mk_eq K.toAddSubgroup x`. Claude suggested using convert. Otherwise no AI used, aside from acting as secondary Loogle. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	59/0	Mathlib/Analysis/InnerProductSpace/ProdL2.lean	1	37	['TJHeeringa', 'github-actions', 'j-loreaux', 'themathqueen', 'wwylele']	j-loreaux assignee:j-loreaux	5-66861 5 days ago	5-66930 5 days ago	14-4601 14 days
38902	xroblot author:xroblot	feat(FieldTheory/Galois/IsGaloisGroup): add `IsGaloisGroup.of_algEquiv` and `of_ringEquiv`	Add two constructors for `IsGaloisGroup`: - `IsGaloisGroup.of_algEquiv`: if `G` is a Galois group on `B/A` and `e : B ≃ₐ[A] B'` is `G`-equivariant, then `G` is a Galois group on `B'/A`. - `IsGaloisGroup.of_ringEquiv`: if `G` is a Galois group on `B/A` and `e : A ≃+* A'` is compatible with the algebra structures, then `G` is a Galois group on `B/A'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	31/0	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	5-64833 5 days ago	5-64873 5 days ago	11-15873 11 days
39061	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk/Paths): a trail which isn't a path has a cycle subwalk	- `p.IsPath ↔ ∀ (v : V) (w : G.Walk v v), w.IsSubwalk p → w.Nil` - `p.IsTrail → (p.IsPath ↔ ∀ (v : V) (w : G.Walk v v), w.IsSubwalk p → ¬w.IsCycle)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	28/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean	2	3	['Rida-Hamadani', 'github-actions']	nobody	5-62976 5 days ago	11-13144 11 days ago	11-13137 11 days
39297	mcdoll author:mcdoll	stuff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		45/46	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/Topology/Constructions/SumProd.lean	7	1	['github-actions']	nobody	5-62318 5 days ago	unknown	0-0 0 seconds
36388	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/AdjMatrix): submatrices and homomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	73/3	Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean	1	19	['SnirBroshi', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen']	nobody	5-62170 5 days ago	6-12348 6 days ago	35-49296 35 days
31176	mcdoll author:mcdoll	feat(Analysis): Taylor's theorem with the integral remainder	Prove Taylor's theorem with the integral remainder in higher dimensions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	145/1	Mathlib.lean,Mathlib/Analysis/Calculus/TaylorIntegral.lean,docs/100.yaml,docs/undergrad.yaml	4	10	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'mcdoll', 'sgouezel']	j-loreaux assignee:j-loreaux	5-60849 5 days ago	5-60849 5 days ago	42-57557 42 days
39280	Thmoas-Guan author:Thmoas-Guan	refactor(Ideal/MinimalPrimes): Refactor minimal primes APIs more entirely	--- - [ ] depends on: #38029 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	222/111	Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Algebraic/StronglyTranscendental.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Colon.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/Zero.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Unramified/Dedekind.lean	14	3	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	5-58502 5 days ago	5-83971 5 days ago	0-7 7 seconds
30109	scholzhannah author:scholzhannah	feat: the subcomplexes of a (relative classical) CW complex form a completely distributive lattice	In this PR we prove that the space of subcomplexes `Subcomplex C` of a (relative classical) CW complex `C` is a `CompletelyDistribLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	304/1	Mathlib/Topology/CWComplex/Classical/Subcomplex.lean	1	26	['ADedecker', 'github-actions', 'j-loreaux', 'scholzhannah']	ADedecker assignee:ADedecker	5-57105 5 days ago	24-58435 24 days ago	31-41120 31 days
38974	Brian-Nugent author:Brian-Nugent	chore: fix documentation of `LocallyQuasiFinite`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry easy	6/5	Mathlib/AlgebraicGeometry/Morphisms/QuasiFinite.lean	1	1	['github-actions']	nobody	5-55891 5 days ago	13-24800 13 days ago	13-24793 13 days
39158	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/Rank): generalize `Matrix.rank`/`LinearMap.rank` to semirings	- Generalize `Matrix.rank` from `CommRing` to `CommSemiring` - Generalize `LinearMap.rank` from `AddCommGroup`s over `Ring`s to `AddCommMonoid`s over `Semiring`s (which are the minimum requirements for `Module`) - Many `Matrix.rank` theorems now require `StrongRankCondition` explicitly (which `CommRing` used to provide) - `Matrix.cRank` theorems don't need commutativity --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	58/64	Mathlib/LinearAlgebra/Dimension/LinearMap.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean	2	1	['github-actions']	nobody	5-55879 5 days ago	8-23362 8 days ago	8-23355 8 days
39160	wwylele author:wwylele	feat(Analysis/Normed): mapping a ball with smul	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	34/0	Mathlib/Analysis/Normed/MulAction.lean	1	5	['copilot-pull-request-reviewer', 'github-actions', 'sgouezel', 'wwylele']	sgouezel assignee:sgouezel	5-55105 5 days ago	5-55134 5 days ago	8-6872 8 days
38762	yuanyi-350 author:yuanyi-350	chore(AlgebraicGeometry/EllipticCurve/Projective/Point): remove erws	- rewrites `neg_of_Z_ne_zero` by splitting the `Fin 3` equality and closing the coordinates with `rw` - rewrites `addXYZ_neg` with `rw` followed by `simp` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-algebraic-geometry LLM-generated awaiting-author	6/3	Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	1	4	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	5-55056 5 days ago	5-55056 5 days ago	12-86367 12 days
38725	yuanyi-350 author:yuanyi-350	chore(AlgebraicGeometry/ProjectiveSpectrum): remove `erw`s	- folds the `erw` steps in `isSeparated` into the surrounding `simp only` rewrites, including `affineOpenCover_f` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	9/12	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean	1	3	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	5-55019 5 days ago	5-55019 5 days ago	13-3096 13 days
38583	kim-em author:kim-em	feat(LinearAlgebra/Matrix/GeneralLinearGroup): polynomial functions on matrices over an infinite field are determined by their values on GL	This PR adds `MvPolynomial.eq_of_eval_eq_on_gl`: two polynomials in `MvPolynomial (m × m) k` over an infinite field `k` are equal whenever their evaluations agree at every invertible matrix. The proof multiplies by the generic determinant `det (Matrix.mvPolynomialX m m k)` so that `MvPolynomial.funext` applies (covering both invertible and non-invertible specializations of the variables), then divides by it (it is nonzero by `Matrix.det_mvPolynomialX_ne_zero`) using that the polynomial ring is an integral domain. The lemma is useful when reasoning about polynomial representations of `GL n k`, where natural identities are easiest to check on `GL n k` itself but the final statement lives at the level of polynomials. The lemma is placed in a new file `Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/MvPolynomial.lean` because the existing `Mathlib/LinearAlgebra/Matrix/MvPolynomial.lean` is upstream of `Adjugate`, which is itself upstream of `GeneralLinearGroup.Defs` — so we cannot import `GeneralLinearGroup.Defs` from `Matrix.MvPolynomial` without creating a cycle. 🤖 Prepared with Claude Code	t-algebra awaiting-author label:t-algebra$	60/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/MvPolynomial.lean	2	6	['SnirBroshi', 'dagurtomas', 'github-actions', 'wwylele']	dagurtomas assignee:dagurtomas	5-54340 5 days ago	5-54340 5 days ago	15-71462 15 days
39095	tb65536 author:tb65536	feat(FieldTheory/Galois/IsGaloisGroup): `IsGaloisGroup` instance for `FixedPoints.subalgebra`	This PR generalizes the existing `IsGaloisGroup` instance for `FixedPoints.intermediateField` to `FixedPoints.subalgebra`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	23/3	Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/GroupTheory/GroupAction/Defs.lean	3	6	['eric-wieser', 'github-actions', 'tb65536']	nobody	5-53085 5 days ago	9-28595 9 days ago	10-40847 10 days
39050	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): `Digraph` is `GraphLike`	`Digraph` has `GraphLike` instance. --- - [ ] depends on: #36743 - [ ] depends on: #39047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	184/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-50432 5 days ago	11-26081 11 days ago	0-523 8 minutes
38606	dennj author:dennj	feat: preparation for Vanishing Sum of Roots of Unity	Adds the Mathlib API extensions needed for an upcoming formalization of the Lam-style classification theorem for vanishing sums of roots of unity. * Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean + `exists_eq_const_of_sum_smul_eq_zero_of_sum_eq_zero_of_linearIndependent`: if `∑ vᵢ = 0` and the first `n-1` of `n` vectors are linearly independent, every linear relation has constant coefficients. * Mathlib/RingTheory/Radical/NatInt.lean + `Nat.totient_eq_div_radical_mul_totient_radical`: Euler's totient splits as `φ(n) = (n / rad n) * φ(rad n)`. * Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean + `IsPrimitiveRoot.sum_range_pow_mul_div_eq_zero_of_dvd`: the `d` evenly-spaced powers of a primitive `k`-th root sum to zero, for `d ∣ k` and `1 < d`. * Mathlib/NumberTheory/Cyclotomic/LinearDisjoint.lean (new) + `IsPrimitiveRoot.linearDisjoint_adjoin_pow_of_coprime`: cyclotomic subfields of coprime orders are linearly disjoint over `ℚ`. * Mathlib/NumberTheory/Cyclotomic/LinearRelations.lean (new) + `IsPrimitiveRoot.coeffs_eq_of_sum_pow_eq_zero_prime_coprime`: in the cyclotomic field of order `p * m` with `p` prime coprime to `m`, any `ℚ⟮ζ^p⟯`-linear relation among powers of `ζ^m` has all coefficients equal. --- I need these as preparation to start formalizing the theorem: Let k be a positive integer. If a finite family of complex k-th roots of unity sums to zero, then the size of the family is a non-negative integer combination of the prime divisors of k. --- Human-made PR with AI used for golfing and documentation	new-contributor	219/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/NumberTheory/Cyclotomic/LinearDisjoint.lean,Mathlib/NumberTheory/Cyclotomic/LinearRelations.lean,Mathlib/RingTheory/Radical/Totient.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	6	3	['github-actions', 'mathlib-merge-conflicts']	nobody	5-48435 5 days ago	5-26604 5 days ago	8-31594 8 days
39054	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): `SimpleGraph` is `GraphLike`	--- - [ ] depends on: #36743 - [ ] depends on: #39047 - [ ] depends on: #36829 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	292/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-47798 5 days ago	11-19520 11 days ago	0-405 6 minutes
39053	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): `Graph` is `GraphLike`	--- - [ ] depends on: #36743 - [ ] depends on: #39047 - [ ] depends on: #36829 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	326/0	Mathlib.lean,Mathlib/Combinatorics/Graph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-47682 5 days ago	11-20536 11 days ago	0-242 4 minutes
36643	Thmoas-Guan author:Thmoas-Guan	feat(Homology): interaction of projective and injective dimension and SES	In this PR, we directly implemented the relation of `projectiveDimension` and `injectiveDimension` in SES. --- - [ ] depends on: #36817 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	148/0	Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/CategoryTheory/Abelian/Injective/Dimension.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean	3	5	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	adamtopaz assignee:adamtopaz	5-46988 5 days ago	5-46988 5 days ago	37-85493 37 days
39279	jayscambler author:jayscambler	feat(Cryptography/Sigma): Schnorr sigma protocol and signature scheme	Adds `Mathlib/Cryptography/Sigma/Schnorr.lean`. New file in a new top-level directory; mathlib currently has no `Mathlib/Cryptography/`, so I've taken `Mathlib/Cryptography/Sigma/` as the natural home for sigma-protocol formalizations. The file proves the three defining properties of Schnorr's identification scheme as a sigma protocol: - `Schnorr.correct`: completeness. Honest verifier accepts honest signer's transcript. - `Schnorr.specialSoundness`: from two accepting transcripts sharing the commitment but using different challenges `c, c'`, the witness `x = (s - s') / (c - c')` is recovered. Needs `q` prime so `c - c'` is invertible in `ZMod q`. - `Schnorr.hvzkAccepts`: the HVZK simulator `g^s · (y^c)⁻¹` always yields accepting transcripts. This is the structural-correctness half of HVZK only; the distributional indistinguishability statement is a separate result and not in this PR. On top of the sigma protocol there's `Schnorr.Signature.{keyGen, sign, verify, correct}` wrapping it as a Fiat-Shamir signature scheme; `Schnorr.Signature.correct` is a one-line corollary of `Schnorr.correct`. Two auxiliary lemmas, `Schnorr.gpow_sub` and `Schnorr.gpow_mul`, bridge `ZMod q` arithmetic and group exponentiation under `Fintype.card G = q`. They're local to this file for now because the surrounding `gpow` API is itself cryptography-specific; if a general `ZMod q`-graded group action framework lands in mathlib later, both lemmas would become instances of it. There's also a small `example` instantiating everything on `Multiplicative (ZMod q)` for `Fact q.Prime` to show the API typechecks. That instantiation is a toy (DLOG is trivial in that group), but it confirms the abstraction is usable. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	352/0	Mathlib.lean,Mathlib/Cryptography/Sigma/Schnorr.lean	2	2	['github-actions']	nobody	5-45787 5 days ago	5-45866 5 days ago	5-46349 5 days
39145	chrisflav author:chrisflav	feat(Algebra/Category): filtered colimits in `AlgCat`	From Proetale. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory awaiting-author label:t-algebra$	132/5	Mathlib.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/Basic.lean	4	6	['chrisflav', 'dagurtomas', 'github-actions', 'robin-carlier']	nobody	5-45171 5 days ago	5-45171 5 days ago	2-10994 2 days
35255	vlad902 author:vlad902	feat(SimpleGraph): `cycleGraph.IsContained` in every graph with a cycle	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	35/0	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-42427 5 days ago	20-28899 20 days ago	20-29839 20 days
39047	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): GraphLike with no multi edges	This PR introduces `NoMultiEdgeGraphLike` (alternative name suggestion are welcome), extension of `GraphLike` for those with no multiple darts, and therefore edges, between a pair of vertices. --- - [ ] depends on: #36743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	140/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-41913 5 days ago	11-28829 11 days ago	0-23 23 seconds
36829	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): introduce SymmGraphLike typeclass	Per discussion at ([#graph theory > HasAdj](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445)), This PR extends `GraphLike` typeclass defined in #36743 for graphs with symmetric darts (`SimpleGraph` and `Graph`, not `Digraph`). ### Main definitions * `SymmGraphLike V D E Gr`: A typeclass extending `GraphLike` with together with `inv`, an involution function on darts that swaps `src` and `tgt`. * `NoMultiEdgeSymmGraphLike V D E Gr`: A typeclass extending `NoMultiEdgeGraphLike` and `SymmGraphLike`. --- - [ ] depends on: #36743 - [ ] depends on: #39047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	245/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	2	5	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-41792 5 days ago	61-32333 61 days ago	0-154 2 minutes
39293	kbuzzard author:kbuzzard	perf: Field.toEuclideanDomain fast_instance%	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Just an experiment. Pulled this fast_instance% off #38087 to see if it makes a difference. Will then try it after #39263 to see if it still makes a difference.	WIP t-algebra label:t-algebra$	3/1	Mathlib/Algebra/EuclideanDomain/Field.lean	1	5	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	5-38719 5 days ago	5-68554 5 days ago	0-2 2 seconds
38114	javgomzar author:javgomzar	feat(FinitelyPresentedGroup): add finite groups instance	Add IsFinitelyPresented instance for finite groups. Co-authored-by: Hang Lu Su , Thomas Browning --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor large-import	31/2	Mathlib/GroupTheory/FinitelyPresentedGroup.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean	2	33	['github-actions', 'javgomzar', 'kbuzzard', 'mathlib-merge-conflicts', 'plp127', 'tb65536', 'vihdzp']	mattrobball assignee:mattrobball	5-37397 5 days ago	5-37433 5 days ago	28-35163 28 days
31662	edwin1729 author:edwin1729	feat(Topology/Order): topological basis of scott topology on Complete…	…PartialOrder --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20Algebraic.20complete.20partial.20order.20and.20domain.20theory/with/536359313) for this PR. (2/5) PRs in domain theory, proving that scott topologies over Algebraic DCPOs (`CompletePartialOrder`) are sober. The main reference is [Renata, Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf). But the statements can also be found in the canonical text [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf) This first PR proves two prerequisites, namely: - the specialization order induced by the scott topology corresponds to the existing order of the DCPO. Prop 3.1.5 in [Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf) and Prop 2.3.2(1) in [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf) - the upward closures of compact elements of the DCPO form a topological basis for the Scott Topology. Prop 3.5.2 in [Duality in Domain Theory](https://alyata.github.io/documents/duality_domain_theory.pdf) and Prop 2.3.6(2) in [Abramsky and Jung](https://www.cs.ox.ac.uk/people/samson.abramsky/handbook.pdf) - [x] depends on: #33061 The next PR is here: #31670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author	165/1	Mathlib.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	5	99	['b-mehta', 'edwin1729', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	b-mehta assignee:b-mehta	5-36298 5 days ago	13-37734 13 days ago	64-31147 64 days
33461	loefflerd author:loefflerd	feat(NumberTheory/Modular): stabilizers for action on upper halfplane	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	343/1	Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/Analysis/Complex/UpperHalfPlane/ProjLine.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/FinTwo.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/Topology/Compactification/OnePoint/ProjectiveLine.lean	7	21	['github-actions', 'loefflerd', 'mathlib-merge-conflicts', 'ocfnash']	ocfnash assignee:ocfnash	5-35822 5 days ago	137-43055 137 days ago	0-1 1 second
39291	MichaelStollBayreuth author:MichaelStollBayreuth	perf: change definition of EuclideanDomain class	This changes the definition of `EuclideanDomain` from ```lean class EuclideanDomain (R : Type) extends CommRing R, Nontrivial R where ... ``` to ```lean class EuclideanDomain (R : Type) [CommRing R] [Nontrivial R] where ... ``` with the goal to see how this affects performance (type class synthesis in particular). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra slow-typeclass-synthesis label:t-algebra$	35/57	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Order/AbsoluteValue/Euclidean.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Data/ZMod/Coprime.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbsoluteValue.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/Real/GoldenRatio.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/EuclideanDomain.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/NatInt.lean,Mathlib/RingTheory/Int/Basic.lean,Mathlib/RingTheory/Polynomial/Dickson.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Radical/Basic.lean,Mathlib/RingTheory/ZMod.lean,MathlibTest/instance_diamonds.lean	25	11	['MichaelStollBayreuth', 'github-actions', 'kbuzzard', 'leanprover-radar']	nobody	5-34923 5 days ago	5-37400 5 days ago	5-59956 5 days
37350	aditya-ramabadran author:aditya-ramabadran	feat(Analysis/Distribution): define canonical maps between Schwartz/test functions, distributions/tempered distributions	Defines these canonical maps: (1) continuous linear map from $\mathcal D$ to $\mathcal S$, and (2) induced (linear) restriction map from $\mathcal S'$ to $\mathcal D'$, as assigned by @ADedecker. --- Put in a separate file since Distribution.lean only imports TestFunction right now and I thought it was cleaner to do in a new bridge file with both the maps. Open to changing this though. * Made use of #36445 (proved first map locally on fixed support spaces first by local seminorm estimates, then used limitCLM) * Needed a real to complex bridge `TestFunction.ToComplexSchwartzMap` since distributions are defined on real-valued test functions but tempered distributions in mathlib are defined on complex-valued Schwartz functions * Induced map $\mathcal S'(E,F) \to \mathcal D'(Ω,F)$ is $\mathbb C$-linear The main important defs are `ContDiffMapSupportedIn.toSchwartzMapCLM` which is the local fixed-support part, then `TestFunction.toSchwartzMapCLM` (where the continuity uses limitCLM to glue the local continuous linear maps on each $\mathcal D_K$), and `TemperedDistribution.toDistributionLM` which is the linear map from tempered distributions to ordinary distributions. Tested with `lake env lean Mathlib/Analysis/Distribution/TestFunctionSchwartz.lean` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor	225/0	Mathlib.lean,Mathlib/Analysis/Distribution/TestFunctionSchwartz.lean	2	23	['aditya-ramabadran', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	5-34008 5 days ago	8-48474 8 days ago	40-48763 40 days
39127	MichaelStollBayreuth author:MichaelStollBayreuth	feat(NumberTheory/Height/NumberField): add lemma on "finite part" of mulHeight	This PR adds ```lean lemma absNorm_mul_finprod_finitePlace_eq_one {K ι : Type} [Field K] [NumberField K] [Finite ι] {x : ι → 𝓞 K} (hx : x ≠ 0) : (Ideal.span <\| Set.range x).absNorm ∏ᶠ v : FinitePlace K, ⨆ i, v (x i) = 1 ``` Because we need it in the proof, we also add a new file Mathlib.Algebra.Order.Hom.Lattice that contains an API lemma that allows reducing the type over which an `iSup` is taken to a subtype. --- - [ ] depends on: #39008 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	115/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Lattice.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/RingTheory/Localization/Integral.lean	5	8	['MichaelStollBayreuth', 'github-actions', 'mathlib-dependent-issues', 'tb65536']	nobody	5-33129 5 days ago	9-29961 9 days ago	0-999 16 minutes
35753	Vilin97 author:Vilin97	feat(Topology/Algebra/Order): regular grid helpers and piecewise linear interpolation	Make API for piecewise linear interpolation on regular grids. I need these to for ODE time-stepping methods, like forward Euler, and later Runge–Kutta methods. Follow-up PR: #35755 (forward Euler method convergence). I don't know if these numerical analysis ODE-solving methods even belong in mathlib. If someone could advise me on it, I would appreciate it. --- The initial proof was produced by [Aristotle](https://aristotle.harmonic.fun). The code was iteratively refined (factoring out lemmas, golfing, simplifying proofs) using Claude Code. - [ ] depends on: #38091	t-topology new-contributor LLM-generated maintainer-merge	201/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	2	59	['Vilin97', 'YanYablonovskiy', 'adomani', 'botbaki-review', 'copilot-pull-request-reviewer', 'dagurtomas', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-dependent-issues', 'wwylele']	j-loreaux assignee:j-loreaux	5-32447 5 days ago	17-24389 17 days ago	49-73462 49 days
36345	Brian-Nugent author:Brian-Nugent	feat(AlgebraicGeometry): Vanishing for Affine Schemes	Proves that quasi-coherent sheaves on affine schemes have vanishing higher cohomology. --- - [ ] depends on: #37187 - [ ] depends on: #35785 - [ ] depends on: #34742 - [ ] depends on: #36218 - [ ] depends on: #35790 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry t-category-theory blocked-by-other-PR merge-conflict	1711/116	Mathlib.lean,Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/AffineVanishing.lean,Mathlib/AlgebraicGeometry/Modules/KempfProp1.lean,Mathlib/AlgebraicGeometry/Modules/Quasicoherent.lean,Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/CategoryTheory/Sites/Abelian.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/ExactSequences.lean,Mathlib/Topology/Sheaves/AddCommGrpCat.lean,Mathlib/Topology/Sheaves/Flasque.lean,Mathlib/Topology/Sheaves/Presheaf.lean,Mathlib/Topology/Sheaves/Restrict.lean,Mathlib/Topology/Sheaves/Sheaf.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean,Mathlib/Topology/Sheaves/ZeroOutside.lean	21	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-32340 5 days ago	unknown	0-0 0 seconds
34855	staroperator author:staroperator	feat(Order): use `to_dual` for `PFilter`	This PR redefines `PFilter` to get rid of `OrderDual` and uses `to_dual` to translate theorems. The whole file of `PFilter` is now deprecated. Some changes: - To align with `Filter`, the order on `PFilter` is changed to the reversed set inclusion. Ultrafilters, the dual notion of maximal ideals, become minimal in this order. - `to_dual` does not work on `sequenceOfCofinals`. I left `Order.Cofinal` and the Rasiowa–Sikorski lemma not `to_dual`-ized, and we should move them to a separate file later. - `IsLEChain` is added to tag `to_dual`. - `IsCoatom.isProper`/`IsCoatom.isMaximal` is deprecated by `Order.Ideal.isProper_of_isCoatom`/`Order.Ideal.isMaximal_of_isProper`, since this result is special to ideals while `IsCoatom` namespace should be for orders in general. --- - [x] depends on: #34820 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	292/242	Mathlib/Order/Atoms.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanAlgebra/Defs.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/PFilter.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/PrimeIdeal.lean,Mathlib/Order/PrimeSeparator.lean,Mathlib/Order/ZornAtoms.lean,Mathlib/RingTheory/IdealFilter/Basic.lean,Mathlib/RingTheory/IdealFilter/Topology.lean,Mathlib/Tactic/Translate/ToDual.lean	13	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-30208 5 days ago	5-29986 5 days ago	17-53291 17 days
38664	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): more API for `SSet.op`	--- TODO: fix the names of some lemmas so that they match those in #35287. - [x] depends on: #38662 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP	130/0	Mathlib/AlgebraicTopology/SimplicialSet/KanComplex/MulStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/Op.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean	3	6	['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-28154 5 days ago	20-37156 20 days ago	0-1 1 second
39310	edegeltje author:edegeltje	feat(CategoryTheory/FiberedCategory/Fibered): Add composition of (strongly) cartesian morphisms and of fibered functors	This PR defines the "vertical pasting" aspects of homlifts and (strongly) cartesian morphisms, it proves that the composition of fibered functors is fibered, and it proves that if an equivalence of categories has the identity natural transformation as its unit or counit, then the backward or forward directions of that equivalence are fibered functors, respectively. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	179/6	Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/Fibered.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean	3	19	['dagurtomas', 'edegeltje', 'github-actions']	nobody	5-25507 5 days ago	5-25507 5 days ago	0-17474 4 hours
38783	marcelolynch author:marcelolynch	experiment / do not review: breaking change for downstream	do not review	WIP toric carleson	7/0	Mathlib/Probability/Combinatorics/BinomialRandomGraph/Defs.lean	1	18	['downstream-reports-automation', 'github-actions']	nobody	5-25225 5 days ago	18-42551 18 days ago	0-473 7 minutes
39334	mcdoll author:mcdoll	feat(FunProp): tag `Monotone` and friends	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order large-import	64/0	Mathlib/Order/Monotone/Defs.lean	1	1	['github-actions']	nobody	5-24932 5 days ago	unknown	0-0 0 seconds
32941	kim-em author:kim-em	feat(GroupTheory/Artin): add braid groups as Artin groups of type A	This PR defines braid groups as Artin groups of type A. - `BraidGroup n`: the braid group B_n on n strands - `BraidGroup.σ`: the standard Artin generators - `BraidGroup.toPermHom`: the canonical surjection B_n → S_n - `BraidGroup.braidGroupTwoEquivInt`: B_2 ≃* ℤ - [ ] depends on: #35219 🤖 Prepared with Claude Code	t-group-theory blocked-by-other-PR LLM-generated merge-conflict	590/2	Mathlib.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Artin/Basic.lean,Mathlib/GroupTheory/Artin/Braid.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/GroupTheory/Coxeter/Perm.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	11	27	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier', 'tb65536', 'themathqueen']	tb65536 assignee:tb65536	5-18208 5 days ago	95-67998 95 days ago	13-11162 13 days
37928	AlexeyMilovanov author:AlexeyMilovanov	refactor(Computability.Encoding): unbundle Γ and remove FinEncoding	This PR unbundles the alphabet `Γ` from the `Encoding` structure and completely removes `FinEncoding`. `Encoding`: The alphabet `Γ` is now an explicit parameter: `structure Encoding (α : Type u) (Γ : Type v)`. `FinEncoding`: Removed. Finiteness is now handled via standard typeclasses (e.g., `[Fintype Γ] (e : Encoding α Γ)`). Combinators: Functions like `finEncodingPair` are simplified to `encodingPair`, dropping the `fin` prefix and `[Fintype]` requirements where no longer needed. Downstream: Mechanically updated `Mathlib.Computability` and `Mathlib.ModelTheory` to pass the explicit `Γ` and use `[Fintype Γ]` where `FinEncoding` was previously required.	new-contributor maintainer-merge	87/67	Mathlib/Computability/Encoding.lean,Mathlib/ModelTheory/Encoding.lean	2	9	['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'vihdzp']	nobody	5-17258 5 days ago	11-68236 11 days ago	37-48085 37 days
35217	kim-em author:kim-em	feat: auxiliary lemmas for Artin and braid groups	This PR adds small lemmas to existing files, in preparation for the Artin groups and braid groups PRs. - `Commute.mul_pow_eq_one`: for commuting elements with `a ^ m = 1` and `b ^ m = 1` - `Equiv.Perm.swap_conjugate`: braid relation for adjacent transpositions - `Equiv.Perm.swap_mul_swap_comm_of_disjoint`: disjoint transpositions commute - `@[grind =]` attributes on `Perm.mul_apply`, `Perm.one_apply`; new `Perm.pow_add_one_apply` - `Subgroup.normalClosure_singleton_one` - `FreeGroup.ofList` and associated lemmas - `FreeGroup.freeGroupUnitMulEquivInt` - `PresentedGroup.instUniqueOfIsEmpty` - `CoxeterMatrix.Aₙ_adjacent`, `CoxeterMatrix.Aₙ_far` 🤖 Prepared with Claude Code	t-group-theory LLM-generated merge-conflict	97/2	Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	7	16	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'themathqueen']	thorimur assignee:thorimur	5-16699 5 days ago	5-16699 5 days ago	20-78468 20 days
35218	kim-em author:kim-em	feat(GroupTheory/Coxeter/Perm): type A Coxeter group maps to symmetric group	This PR constructs the canonical surjective homomorphism from the type A Coxeter group to the symmetric group, sending simple reflections to adjacent transpositions. - `swapFun`: maps generator `i` to `swap i.castSucc i.succ` - `swapFun_isLiftable`: adjacent transpositions satisfy the Coxeter relations - `CoxeterMatrix.typeAₙToPermHom`: the homomorphism from `(Aₙ n).Group` to `Perm (Fin (n + 1))` - `CoxeterMatrix.typeAₙToPermHom_surjective`: surjectivity - [ ] depends on: #35217 🤖 Prepared with Claude Code	blocked-by-other-PR t-group-theory LLM-generated merge-conflict	214/2	Mathlib.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/GroupTheory/Coxeter/Perm.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	9	8	['eric-wieser', 'github-actions', 'joneugster', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16697 5 days ago	95-16164 95 days ago	0-677 11 minutes
35219	kim-em author:kim-em	feat(GroupTheory/Artin): define Artin groups and their universal property	This PR defines Artin groups (also called Artin-Tits groups) as presented groups associated to Coxeter matrices, and establishes their universal property. - `CoxeterMatrix.ArtinGroup`: the Artin group associated to a Coxeter matrix - `CoxeterMatrix.artinGenerator`: the generators of the Artin group - `CoxeterMatrix.IsArtinLiftable`: the braid relation condition for liftability - `CoxeterMatrix.artinLift`: the universal property of Artin groups - `CoxeterMatrix.artinToCoxeter`: the canonical surjection to the Coxeter group - `CoxeterMatrix.artinToCoxeter_surjective`: surjectivity - [ ] depends on: #35218 🤖 Prepared with Claude Code	blocked-by-other-PR t-group-theory LLM-generated merge-conflict	429/2	Mathlib.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Artin/Basic.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/GroupTheory/Coxeter/Perm.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	10	6	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16696 5 days ago	95-16166 95 days ago	0-624 10 minutes
36534	Vierkantor author:Vierkantor	experiment: define a simproc for simplifying `a = b` from `b = a`	Can we define a working simproc that tries to simplify expressions of the form `b = a` given simp lemmas talking about `a = b`? If this does not hurt build times too much, that would solve [task 40](https://github.com/mathlib-initiative/TaskList/issues/40). --- - [ ] depends on: #37850 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic WIP merge-conflict	146/56	Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Imo/Imo2024Q5.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/MvPolynomial/Nilpotent.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Pi.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Fin/Tuple/Sort.lean,Mathlib/Data/Matrix/Diagonal.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/LinearAlgebra/Matrix/Permutation.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic/NormNum/Irrational.lean	33	16	['Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16446 5 days ago	67-51262 67 days ago	0-1598 26 minutes
36746	YaelDillies author:YaelDillies	refactor(Algebra/MonoidAlgebra): use `coeff`/`ofCoeff` more	Use `coeff : R[M] → M →₀ R` and `ofCoeff : (M →₀ R) → R[M]` more widely as a way to convert explicitly between `MonoidAlgebra` and `Finsupp` and thus avoiding defeq abuse. This is a fast and loose preliminary version of #25273. In particular, some proofs break and need to be fixed with either `set_option backward.isDefEq.respectTransparency false`. The situation will improve again once #25273. All the changes beyond using `coeff`/`ofCoeff` in the basic API are motivated by fixing downstream breakage. --- - [x] depends on: #36678 - [x] depends on: #36768 - [x] depends on: #36848 - [x] depends on: #36851 - [x] depends on: #37210 - [x] depends on: #37750 - [ ] depends on: #37755 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR awaiting-CI	1160/1334	Mathlib/Algebra/FreeAlgebra/Cardinality.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Defs.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Algebra/Polynomial/SumIteratedDerivative.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Analysis/Fourier/BoundedContinuousFunctionChar.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic.lean,Mathlib/MeasureTheory/Measure/LevyConvergence.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Derivation/MapCoeffs.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/HopfAlgebra/MonoidAlgebra.lean,Mathlib/RingTheory/IsAdjoinRoot.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/MvPolynomial/EulerIdentity.lean,Mathlib/RingTheory/MvPolynomial/FreeCommRing.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/MvPolynomial/IrreducibleQuadratic.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/Free.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	85	17	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16445 5 days ago	41-51021 41 days ago	0-3044 50 minutes
37553	grunweg author:grunweg	chore: golf using .ne and friends	ne_of_gt -> .ne' ne_of_lt -> .ne le_of_lt -> .le Drive-by golfs using gcongr and positivity and been split into separate PRs. --- - [x] depends on: #37462 - [x] depends on: #37715 - [x] depends on: #37554 - [x] depends on: #37845 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	302/321	Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/NowhereDifferentiable.lean,Counterexamples/TopologistsSineCurve.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/BigOperators/Group/Multiset.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/DerivativeTest.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/Poisson.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/Caratheodory.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinInversion.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Field/Approximation.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/ContinuousAlgEquiv.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/Normed/Unbundled/IsPowMulFaithful.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Int/Interval.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Log.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Real/ConjExponents.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean	114	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-16198 5 days ago	5-16198 5 days ago	13-66876 13 days
38596	JJYYY-JJY author:JJYYY-JJY	Add basic row-equivalence and echelon-form API for matrices	This PR adds the first foundational slice of `Mathlib.LinearAlgebra.Matrix.Echelon`, a theorem-oriented API for elementary row operations, row-equivalence, and echelon-form predicates for matrices. The main additions are: * elementary row-scaling matrices and their `GL` versions; * `Matrix.RowEquivalent` for the left action of `GL m R` on rectangular matrices; * row-zero, pivot, echelon, and reduced-echelon predicates; * semantic representative predicates `Matrix.IsEchelonFormOf` and `Matrix.IsReducedEchelonFormOf`. This intentionally stops before row-space characterizations, existence and uniqueness of reduced echelon representatives, and the noncomputable canonical representative `Matrix.rref`; those are planned for later PRs. Co-authored-by: Joseph Qian Co-authored-by: Veer Shukla Co-authored-by: Dhruv Bhatia Co-authored-by: Zheng Wu <1036819072@qq.com> --- This update trims the original full row-reduction API in response to reviewer feedback that the PR was too large. It keeps only the foundation needed by later row-reduction and `rref` PRs.	t-algebra new-contributor label:t-algebra$	312/6	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Echelon.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean	3	10	['JJYYY-JJY', 'SnirBroshi', 'copilot-pull-request-reviewer', 'dagurtomas', 'github-actions', 'wwylele']	nobody	5-15536 5 days ago	5-18615 5 days ago	12-80431 12 days
36698	ghseeli author:ghseeli	feat(Combinatorics/Enumerative): Latin squares	This PR defines Latin rectangles and Latin squares and proves an extension theorem using Hall's Marriage Theorem. ## Main results - `group_to_cayley_table`: every finite group `G` yields a `LatinSquare G G`. - `latin_rectangle_extends_one_row`: a (non-square) `LatinRectangle` extends to a `LatinRectangle` with one more row. This is an application of Hall's Marriage Theorem, `hallMatchingsOn.nonempty`. - `latin_rectangle_extends_to_latin_square`: a `LatinRectangle` extends to a `LatinSquare`. This is included in a new file `Combinatorics/Enumerative/LatinSquare.lean`. --- - [ ] depends on: #37190 - [ ] depends on: #37720 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics blocked-by-other-PR	638/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Enumerative/LatinSquare.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Data/Fintype/Card.lean,docs/references.bib	6	78	['SnirBroshi', 'cjrl', 'eric-wieser', 'ghseeli', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	5-14868 5 days ago	45-37488 45 days ago	16-40743 16 days
38070	grunweg author:grunweg	feat: add informal attribute	This allows tagging a definition or concept with an informal mathematics concept: the details are subject to discussion. The implementation largely parallels the stacks tags attribute. -------- This PR, if desired, should land in stages: pre-requisites to merge before include (in order): - fix comment typos in the stacks file - rename the file to DatabaseAttributes - add a module deprecation - then this PR, which should be relatively small Open question: can the parsers be shared better? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP file-removed merge-conflict	121/39	Mathlib.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DatabaseAttributes.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/JacobsonSpace.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/Spectral/Hom.lean,MathlibTest/DatabaseAttributes.lean,scripts/noshake.json	13	11	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mattrobball']	nobody	5-12759 5 days ago	32-21278 32 days ago	0-45796 12 hours
38822	ldct author:ldct	feat(IntervalIntegrable): add `fun_prop` support	Allow `fun_prop` to work on `IntervalIntegrable` goals --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author merge-conflict	27/6	Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,MathlibTest/fun_prop.lean	4	8	['github-actions', 'grunweg', 'mathlib-merge-conflicts']	kex-y assignee:kex-y	5-12754 5 days ago	15-46973 15 days ago	1-68245 1 day
38965	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet/Homology): extension of scalars	If `X` is a simplicial set, `R₁ →+* R₂` is a morphism of commutative rings, and `M₁` is a `R₁`-module, then the chain complex of `R₂`-modules of `X` with coefficients in `R₂ ⊗[R₁] M₁` identifies to the extensions of scalars of the chain complex of `R₁`-modules of `X` with coefficients in `M₁`. In this file, we obtain a formulation of this result where the extension of scalars functor `ModuleCat R₁ ⥤ ModuleCat R₂` is replaced by an arbitrary functor `F : C ⥤ D` which commutes with coproducts. (As `SimplicialObject` is now an `abbrev` for a category of functors, `SimplicialObject.whiskering` is also made an abbrev here.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology awaiting-author merge-conflict	127/35	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/MapHomologicalComplex.lean,Mathlib/AlgebraicTopology/SingularHomology/Basic.lean,Mathlib/CategoryTheory/Limits/Preserves/SigmaConst.lean	7	4	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts']	nobody	5-12750 5 days ago	11-28723 11 days ago	2-20419 2 days
39119	kbuzzard author:kbuzzard	perf(Algebra/*): fast_instance% for prio 100 instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I got Claude code to put `fast_instance%` in front of every priority 100 type-valued instance in `Mathlib/Algebra`, just because this sort of thing is easy now. This broke a couple of files with typeclass inference failing to find instances on fields, so I reverted the changes in `Mathlib/Algebra/Field/Defs.lean` and now mathlib builds.	WIP t-algebra merge-conflict label:t-algebra$	138/114	Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Action/Rat.lean,Mathlib/Algebra/Ring/Commute.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Star/Basic.lean	18	7	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	5-12746 5 days ago	9-50228 9 days ago	0-1 1 second
39169	thorimur author:thorimur	bench: experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed merge-conflict	428/456	Mathlib.lean,Mathlib/Algebra/Expr.lean,Mathlib/Algebra/Field/ModEq.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/CategoryTheory/Abelian/Injective/Resolution.lean,Mathlib/CategoryTheory/Category/Init.lean,Mathlib/CategoryTheory/ConcreteCategory/Bundled.lean,Mathlib/Combinatorics/Matroid/Init.lean,Mathlib/Combinatorics/SimpleGraph/Init.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Control/Combinators.lean,Mathlib/Control/Fold.lean,Mathlib/Control/Lawful.lean,Mathlib/Control/ULift.lean,Mathlib/Data/Array/Defs.lean,Mathlib/Data/Array/Extract.lean,Mathlib/Data/Bool/AllAny.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Attr.lean,Mathlib/Data/Ineq.lean,Mathlib/Data/Int/DivMod.lean,Mathlib/Data/Int/Notation.lean,Mathlib/Data/List/Lookmap.lean,Mathlib/Data/List/ModifyLast.lean,Mathlib/Data/List/Monad.lean,Mathlib/Data/List/PeriodicityLemma.lean,Mathlib/Data/List/TFAE.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Notation.lean,Mathlib/Data/Nat/NthRoot/Defs.lean,Mathlib/Data/Option/Defs.lean,Mathlib/Data/Option/NAry.lean,Mathlib/Data/Ordering/Basic.lean,Mathlib/Data/Prod/PProd.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/String/Defs.lean,Mathlib/Data/Subtype.lean,Mathlib/Data/Sym/Sym2/Init.lean,Mathlib/Data/UInt.lean,Mathlib/Deprecated/Aliases.lean,Mathlib/Geometry/Euclidean/Inversion/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Lean/EnvExtension.lean,Mathlib/Lean/Exception.lean,Mathlib/Lean/Expr.lean,Mathlib/Lean/Expr/Rat.lean,Mathlib/Lean/FoldEnvironment.lean,Mathlib/Lean/GoalsLocation.lean,Mathlib/Lean/Json.lean,Mathlib/Lean/LocalContext.lean,Mathlib/Lean/MessageData/ForExprs.lean,Mathlib/Lean/MessageData/Trace.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Lean/Meta/DiscrTree.lean,Mathlib/Lean/Meta/KAbstractPositions.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/Simp.lean,Mathlib/Lean/Meta/Tactic/Rewrite.lean,Mathlib/Lean/Name.lean,Mathlib/Lean/PrettyPrinter/Delaborator.lean,Mathlib/Lean/Thunk.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/Logic/ExistsUnique.lean,Mathlib/Logic/Function/Coequalizer.lean,Mathlib/Logic/Function/CompTypeclasses.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/ULift.lean,Mathlib/Logic/IsEmpty/Defs.lean,Mathlib/Logic/Nonempty.lean,Mathlib/Logic/OpClass.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ApplyAt.lean,Mathlib/Tactic/ApplyCongr.lean,Mathlib/Tactic/ApplyFun.lean,Mathlib/Tactic/ApplyWith.lean,Mathlib/Tactic/ArithMult/Init.lean,Mathlib/Tactic/Attr/Register.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/Bound/Init.lean,Mathlib/Tactic/Cases.lean,Mathlib/Tactic/CasesM.lean,Mathlib/Tactic/CategoryTheory/CategoryStar.lean,Mathlib/Tactic/CategoryTheory/Coherence/Datatypes.lean,Mathlib/Tactic/Change.lean,Mathlib/Tactic/Check.lean	314	4	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	nobody	5-12743 5 days ago	unknown	0-0 0 seconds
39194	grunweg author:grunweg	Sobolev wip	#32305 on current master, hopefully --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI t-measure-probability merge-conflict	2116/9	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Distribution/WeakDeriv.lean,Mathlib/Analysis/FunctionalSpaces/Sobolev/Basic.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean	7	2	['github-actions', 'mathlib-merge-conflicts']	nobody	5-12742 5 days ago	unknown	0-0 0 seconds
39253	Paul-Lez author:Paul-Lez	feat(LinearAlgebra/Basis/HasCanonicalBasis): propose `HasCanonicalBasis` class	This PR continues the work from #25425. Original PR: https://github.com/leanprover-community/mathlib4/pull/25425		104/0	Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	1	1	['github-actions']	nobody	5-12737 5 days ago	unknown	0-0 0 seconds
35820	smmercuri author:smmercuri	feat: unit lemmas and embedding for `FiniteAdeleRing`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	42/4	Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean	1	11	['Multramate', 'Ruben-VandeVelde', 'github-actions', 'smmercuri']	mariainesdff assignee:mariainesdff	5-12404 5 days ago	27-70260 27 days ago	73-54773 73 days
37185	gasparattila author:gasparattila	chore(Data/Finset/Lattice/Fold): rename `comp_sup_` to `apply_sup_`	These lemmas are of the form `g (s.sup f) = s.sup (g ∘ f)` with no composition on the LHS. --- - [x] depends on: #37047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	44/26	Mathlib/Algebra/Order/Ring/Finset.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Data/ENNReal/Lemmas.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Order/PartialSups.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean,Mathlib/Topology/ContinuousMap/Ordered.lean	11	4	['gasparattila', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	5-12403 5 days ago	40-26269 40 days ago	40-26588 40 days
38816	tb65536 author:tb65536	refactor(GroupTheory/Finiteness): make duplicate definitions into abbrevs	The definitions `Submonoid.FG`, `Group.FG`, and `Subgroup.FG` are all equivalent to `Monoid.FG`, so I've made them into abbrevs. In the future we might even want to consider deprecating all but one to avoid having four ways to write the same thing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	140/122	Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/MonoidLocalization/Finite.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness/Defs.lean,Mathlib/RingTheory/Localization/InvSubmonoid.lean	9	5	['eric-wieser', 'github-actions', 'j-loreaux', 'tb65536']	mattrobball assignee:mattrobball	5-12399 5 days ago	17-35322 17 days ago	17-35316 17 days
38821	Jun2M author:Jun2M	feat(Data/List): rotation of sublist is sublist of rotation	This PR proves `(∃ L₁ : List α, L ~r L₁ ∧ L₁ <+ L') ↔ (∃ L₂ : List α, L <+ L₂ ∧ L₂ ~r L')`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	10/0	Mathlib/Data/List/Rotate.lean	1	3	['SnirBroshi', 'eric-wieser', 'github-actions']	joneugster assignee:joneugster	5-12399 5 days ago	17-31985 17 days ago	17-31978 17 days
39184	yuanyi-350 author:yuanyi-350	refactor(Analysis): golf `Mathlib/Analysis/Normed/Module/FiniteDimension`	- rewrites `SecondCountableTopology (E →L[𝕜] F)` using a finite-dimensional equivalence and `e₂.toHomeomorph.secondCountableTopology` - moves `ContinuousLinearEquiv.piRing` next to the argument that reuses it Extracted from #37968 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-analysis LLM-generated	33/68	Mathlib/Analysis/Normed/Module/FiniteDimension.lean	1	2	['github-actions', 'yuanyi-350']	sgouezel assignee:sgouezel	5-12396 5 days ago	7-72065 7 days ago	7-72058 7 days
39341	drocta author:drocta	feat(Algebra/Colimit/DirectLimit): add DirectLimit.(NonUnital)StarAlgebra.(lift/of) maps and associated lemmas	add the `of` and `lift` maps for `DirectLimit.StarAlgebra` and `DirectLimit.NonUnitalStarAlgebra`, as well as the associated lemmas, `of_f`, `lift_comp_of`, `lift_of`, and `hom_ext` for each. Also make `DirectLimit.NonUnitalAlgebra` only require `[Monoid R]` rather than `[CommSemiring R]`. --- Use of AI: I again asked ChatGPT for some advice about some things about this code. I can personally vouch for all of the code I'm submitting, and that I understand all of it. This is the third part of my project towards supporting direct limits of $C^∗$ -algebras (as I described [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Early.20feedback.20on.20approach.20towards.20formalizing.20UHF.20algebras.3F) ). This PR adds an import of `Mathlib.Algebra.Star.StarAlgHom` (because it needs `StarAlgHom` and `NonUnitalStarAlgHom`) replacing/encompassing the previously added imports of `Mathlib.Algebra.Star.StarRingHom` and `Mathlib.Algebra.Algebra.NonUnitalHom` (added in PR #38308 and #38672 respectively).	t-algebra new-contributor label:t-algebra$	100/3	Mathlib/Algebra/Colimit/DirectLimit.lean	1	2	['github-actions']	nobody	5-11810 5 days ago	5-14502 5 days ago	5-14495 5 days
39340	vihdzp author:vihdzp	feat: redefine `Ordinal.deriv` in terms of `Order.enum`	--- - [ ] depends on: #39285 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	693/17	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Univ.lean	11	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-8087 5 days ago	unknown	0-0 0 seconds
39016	vihdzp author:vihdzp	chore: deprecate `WithZero.zero_le`	This is a duplicate of `zero_le` in the root namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra maintainer-merge label:t-algebra$	14/24	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/FieldTheory/RatFunc/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	4	2	['YaelDillies', 'github-actions']	nobody	5-7453 5 days ago	11-80410 11 days ago	11-82623 11 days
39347	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): refactor of Pattern and shift-invariance of shape languages for subshifts	## Summary This PR refactors Pattern.mulShift in Mathlib/Dynamics/SymbolicDynamics/Basic.lean and uses the cleaner definition to prove shift-invariance of the language of a subshift on a finite shape. ## Changes Pattern.mulShift now returns a Pattern instead of a configuration (more natural). - Old type: Pattern.mulShift : Pattern A G → G → (G → A) - New type: Pattern.mulShift : Pattern A G → G → Pattern A G - The result carries its support (p.support.image (v * ·)) and the default-outside-support proof, so callers don't have to re-derive them. The [IsLeftCancelMul G] hypothesis is moved to the lemmas that actually use it. - The definition Pattern.mulShift itself no longer needs left-cancellation (it only chooses a preimage noncomputably). - The hypothesis is now stated on mulShift_config_apply_mul_left_of_mem and mulOccursInAt_eq_cylinder directly, instead of being a section-level variable. Renames following the type change. - mulShift_apply_mul_left_of_mem → mulShift_config_apply_mul_left_of_mem (because we now write (p.mulShift v).config instead of p.mulShift v). New @[simp] and @[ext] lemmas for Pattern. - Pattern.ext: two patterns are equal iff their supports agree and their configurations agree on the support. - Pattern.mulShift_support: the support of p.mulShift v is p.support.image (v * ·). - Pattern.fromConfig_support: the support of fromConfig x U is U. - Pattern.fromConfig_config_of_mem: on its support, fromConfig x U agrees with x. New lemma Pattern.fromConfig_mulShift. For a left inverse g' * g = 1, shifting the pattern fromConfig x U by g equals fromConfig (mulShift g' x) (U.image (g * ·)). New theorem MulSubshift.languageOn_image_mulShift. For a subshift Y and elements g, g' with g * g' = 1 and g' * g = 1: (fun p => p.mulShift g) '' Y.languageOn U = Y.languageOn (U.image (g * ·)) i.e. the language on the translated shape is exactly the image of the language on U under the pattern-shift map. This gives a bijection between Y.languageOn U and Y.languageOn (U.image (g * ·)), with inverse p ↦ p.mulShift g'. Stated for left-cancellative monoids with an invertible element. Updated docstrings for Pattern.mulShift and the renamed lemma to reflect the bundled-Pattern return type and clarify which results need [IsLeftCancelMul G].	t-dynamics new-contributor	142/48	Mathlib/Dynamics/SymbolicDynamics/Basic.lean	1	3	['github-actions']	nobody	5-7210 5 days ago	5-7371 5 days ago	5-7364 5 days
39218	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): make `p.Nil` the simpNF of `p = nil` and `p.length = 0`	These are equivalent, and `p.Nil` works even when the endpoints of the walk aren't defeq. [#graph theory > Deprecate `p = nil` in favor of `p.Nil`?](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Deprecate.20.60p.20.3D.20nil.60.20in.20favor.20of.20.60p.2ENil.60.3F/with/538017334) The main event is `Walk/Basic.lean`: - Swapped sides of `nil_iff_eq_nil` to create `eq_nil_iff_nil`, tagged `@[simp]` and deprecated the original - Changed the RHS of `length_eq_zero_iff` from `p = nil` to `p.Nil`, and generalized to non-closed walks - Deprecated `nil_iff_length_eq` which is the symmetric iff - Added `Nil.length_eq_zero` alias - Untagged `exists_length_eq_zero_iff` with `@[simp]` and added `exists_nil_iff` to replace it The rest is fixing everything that broke (or uses of now-deprecated lemmas), and: - [`Walk/Maps`] Added `nil_map_iff` to replace `map_eq_nil_iff` which is the same but with `.Nil` instead of `= nil` - [`Walk/Decomp`] Added `nil_rotate` to replace `rotate_eq_nil` which is the same but with `.Nil` instead of `= nil` --- Also renamed `set_walk_*` in `Counting.lean` to follow the naming convention. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	70/54	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Counting.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Traversal.lean	10	10	['SnirBroshi', 'YaelDillies', 'github-actions']	nobody	5-5918 5 days ago	6-53709 6 days ago	7-5866 7 days
37577	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): upgrade subset theorems to sublist/prefix/suffix	Upgrades theorems about `p.support ⊆ q.support` / `p.darts ⊆ q.darts` / `p.edges ⊆ q.edges` to `List.IsInfix`/`List.IsSuffix`/`List.Sublist`, which imply the subset versions. Also adds `cycleBypass` sublist lemmas that were missing, and golfs `length_bypass_le` and `bypass_eq_self_of_length_le` using the new sublist theorems. Co-authored-by: Iván Renison <85908989+IvanRenison@users.noreply.github.com> --- Except for a couple of `cycleBypass` ones, I did not add such theorems where there was no subset theorem to begin with (e.g. `(p.take n).darts <+: p.darts`), as they are usually not worth stating since they're trivial and simp proves them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	112/81	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	5	4	['YaelDillies', 'github-actions']	nobody	5-5900 5 days ago	6-52821 6 days ago	45-85191 45 days
36743	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): introduce `GraphLike` typeclass	Per discussion at ([#graph theory > HasAdj](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445)), This PR introduces the `GraphLike` typeclass to capture the notions like `dart` and `walk` across various graph objects, such as `SimpleGraph`, `Graph`, and `Digraph`. The goal is that by abstracting these core components into a typeclass, we can prove these results once for all graph-like structures rather than duplicating them across different graph types. ### Main definitions * `GraphLike V D E Gr`: A typeclass parameterized by a vertex type `V`, dart type `D` and a graph type `Gr` (with `V`, `D` & `E` as an `outParam`). * `GraphLike.verts : Set V`: The set of vertices of the graph. * `GraphLike.darts : Set D`: The set of darts of the graph. * `GraphLike.edges : Set E`: The set of edges of the graph. * `GraphLike.Adj : V → V → Prop`: The adjacency relation, defined by default as `∃ d ∈ darts, fst d = u ∧ snd d = v`. --- This PR generalises #35776 to also unify `Graph`. PRs depending on this PR are #39047 (graphLike with no multi edges) => #39050 (Digraph is graphLike) \|\| V #36829 (undirected graphLike) => #39053 (Graph is graphLike) & #39054 (Simplegraph is graphLike) \|\| V #36756 (def of walk on GraphLike) => #36971 (change Simplegraph to use GraphLike walk) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	104/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean	2	78	['IvanRenison', 'Jun2M', 'SnirBroshi', 'YaelDillies', 'github-actions', 'lauramonk', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	5-920 5 days ago	10-44472 10 days ago	61-42881 61 days
39352	qawbecrdtey author:qawbecrdtey	chore(Data/Finset/Slice): remove unnecessary import	--- Remove import which was transitively being imported. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	0/1	Mathlib/Data/Finset/Slice.lean	1	1	['github-actions']	nobody	4-79697 4 days ago	4-79691 4 days ago	4-79809 4 days
34440	grunweg author:grunweg	feat: linter for name components in uppercase	Per the naming convention, these are errors (unless they are an abbreviation). Mathlib has many violations at the moment: for this reason, we add this as an environment linter and automatically add all current exceptions. Once these have been fixed, converting to a syntax linter is desirable. Until then, track the number of such exceptions as technical debt. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20linter/with/570617527) Note to self: wait for CI, then do a final nolints update. and try to implement the follow-up soon [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import awaiting-author merge-conflict please-adopt	1018/9	Mathlib/Tactic/Linter/Style.lean,MathlibTest/DoubleUnderscore.lean,MathlibTest/HashLint.lean,MathlibTest/Lint.lean,MathlibTest/LintStyle.lean,scripts/nolints.json,scripts/technical-debt-metrics.sh	7	27	['Vierkantor', 'github-actions', 'grunweg', 'joneugster', 'mathlib-merge-conflicts']	nobody	4-76091 4 days ago	89-71453 89 days ago	13-82065 13 days
27897	grunweg author:grunweg	feat: check indentation of doc-strings	Likely will require further adaptations to mathlib. May land piece-wise. But at first, let's see how big the overall fallout actually is. (So far: 100 lines of implementation and tests, and 170 lines of fix-ups; which are probably mostly complete, but not entirely.) --- - [x] depends on: #27898 - [x] depends on: #39245 - [x] depends on: #39246 - [x] depends on: #39247 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-CI awaiting-author	363/81	Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/OrthogonalReflection.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/Num/Basic.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Dynamics/BirkhoffSum/QuasiMeasurePreserving.lean,Mathlib/Geometry/Euclidean/Simplex.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Centroid.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/Probability/Kernel/Deterministic.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/EMetricSpace/PairReduction.lean,MathlibTest/DocStringLinter.lean	38	13	['github-actions', 'grunweg', 'joneugster', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	4-72692 4 days ago	288-61126 288 days ago	0-1 1 second
38225	kim-em author:kim-em	ci: block merging PRs with large import increases unless reviewed	This PR makes the existing `large-import` label into a merge gate. PRs that significantly increase transitive imports (>2% for any modified file) are now blocked from merging until a reviewer adds the `allow-large-import` label. ### Why three labels? Bors's `block_labels` has no conditional logic — if a label is in the list, merge is blocked unconditionally. We need "blocked unless a reviewer has approved", i.e. `large-import ∧ ¬allow-large-import`. Since bors can't express that, we use a derived label: \| Label \| Managed by \| Purpose \| \|---\|---\|---\| \| `large-import` \| `build` job (import analysis) \| Factual: this PR increases imports \| \| `blocked-by-large-import` \| `check-large-import` job \| Operational: blocks bors \| \| `allow-large-import` \| Reviewer \| Override: reviewer approves the increase \| Each label is managed by exactly one actor, so there is no label-fighting. ### How it works 1. The existing `build` job adds/removes `large-import` based on import analysis (unchanged). 2. A new `check-large-import` job (in the same workflow) waits for `build` to finish, then: - If `large-import` is present and `allow-large-import` is absent → adds `blocked-by-large-import` - Otherwise → removes `blocked-by-large-import` 3. `blocked-by-large-import` is added to `block_labels` in `bors.toml`. When a reviewer adds `allow-large-import`, the `labeled` event re-triggers the workflow. The heavy `build` job is skipped (guarded by `github.event.action != 'labeled'`), but the lightweight `check-large-import` job runs, sees both labels, and removes `blocked-by-large-import`. Bors can now merge. ### Reviewer workflow The CI failure message tells the reviewer to consider whether the PR could be improved by splitting files, rearranging material, or creating new intermediate files. If the import increase is reasonable, they add `allow-large-import`. False positives can be reported on the [mathlib4 Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/large-import.20label). 🤖 Prepared with Claude Code	CI	78/2	.github/workflows/PR_summary.yml,bors.toml	2	7	['SnirBroshi', 'github-actions', 'jcommelin', 'joneugster', 'kim-em']	nobody	4-71720 4 days ago	28-18419 28 days ago	28-19030 28 days
38472	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): The Weil divisor associated to an element of the function field on a locally Noetherian integral scheme	In this PR we define and provide some basic API for principal Weil divisors, i.e. the Weil divisor associated to an element of the function field of a locally noetherian, integral scheme. - [ ] depends on: #29774 - [ ] depends on: #37985 - [ ] depends on: #37901 - [ ] depends on: #38002 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	713/0	Mathlib.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Basic.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Principal.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Minimal.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean,Mathlib/Topology/Sober.lean	11	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-70460 4 days ago	24-47210 24 days ago	0-1194 19 minutes
37677	vihdzp author:vihdzp	feat: club sets	In set theory, a club set is a subset of an ordinal of uncountable cofinality, which is closed in the order topology, and unbounded within the ordinal. We generalize this notion to that of a club set in a well-order `α`: this is a set which is cofinal and closed under suprema. We recover the more standard notion by setting `α = Iio o`, whenever `ℵ₀ < o.cof`. We prove that club sets are closed under intersections of size less than the cofinality of `α`, and that the fixed points of a normal function are a club set. --- The idea is to eventually rework [`Ordinal.deriv`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/FixedPoint.html#Ordinal.deriv). This is simply the enumerator function for the fixed points of `f`, and enumerator functions for club sets are always normal. - [x] depends on: #37670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order maintainer-merge	181/13	Mathlib.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Cofinality/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality/Club.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/FundamentalSequence.lean	8	17	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'staroperator', 'vihdzp']	nobody	4-69935 4 days ago	4-72874 4 days ago	26-3465 26 days
39288	FordUniver author:FordUniver	feat(Combinatorics/SimpleGraph/Subgraph): add `Embedding.ofIsInduced` and `IsInduced.map`	Three additions to the `SimpleGraph.Subgraph` API for induced subgraphs. `Embedding.ofIsInduced` is the canonical embedding of an induced subgraph into its ambient graph, paired with `toHom_ofIsInduced` and `ofIsInduced_apply` lemmas. This is the embedding counterpart of `Subgraph.hom`, which only produces a homomorphism because non-induced subgraphs do not reflect adjacency. `Subgraph.IsInduced.map` then records that the image of an induced subgraph under a graph embedding is induced, strengthened to `IsInduced.map_iff` for the iso case. --- Orthogonal pre-requisite of the `Copy` / `InducedCopy` refactor-feat stack. Extracted as a prerequisite from #38631 that is otherwise independent of the wider `Copy` / `InducedCopy` refactor-feat stack.	t-combinatorics	27/4	Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	2	15	['FordUniver', 'SnirBroshi', 'github-actions', 'mathlib-bors']	nobody	4-67866 4 days ago	5-46576 5 days ago	5-68133 5 days
38966	smmercuri author:smmercuri	chore(Algebra): `coe_ringHom` -> `coe_toRingHom`	--- - [ ] depends on: #38950 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	197/120	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/Isaacs.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/LinearAlgebra/Charpoly/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean,Mathlib/NumberTheory/NumberField/CMField.lean,Mathlib/NumberTheory/NumberField/Ideal/KummerDedekind.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/MvPolynomial.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DividedPowerAlgebra/Init.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/LocalRing/ResidueField/Polynomial.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Factorization.lean,Mathlib/RingTheory/RingHom/StandardSmooth.lean,Mathlib/RingTheory/RingInvo.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,Mathlib/RingTheory/Trace/Quotient.lean,Mathlib/RingTheory/Unramified/Basic.lean	63	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-57910 4 days ago	13-44090 13 days ago	0-4608 1 hour
38964	smmercuri author:smmercuri	chore(Algebra): consolidate variables and sections for `AlgHom`/`AlgEquiv`	This is a preparatory PR for the refactor of `AlgHom` to be semilinear (see #38376). This PR does not add or remove any results and only moves things around to reduce the diff for the future refactor. Namely, we do the following: - Re-order variables in `AlgHom` and `AlgEquiv` so that `CommSemiring R` directly follows `R`. This is needed in the semialgebra definition. - Move `comp` and `trans` API later in respective files so that the extra variables needed for those lemmas can be sectioned better. - Similarly move some `congr` results in `Equiv.lean` to their own sections. - Align variable names in `Equiv.lean` to match `Hom.lean` --- - [ ] depends on: #38950 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	488/425	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Notation.lean,Mathlib/FieldTheory/Isaacs.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/LinearAlgebra/Charpoly/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Algebraic/MvPolynomial.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/DividedPowerAlgebra/Init.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Factorization.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,MathlibTest/GalNotation.lean	40	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-57583 4 days ago	13-43107 13 days ago	0-8935 2 hours
38507	grunweg author:grunweg	fix(Linter/PrivateModule): only suggest @[expose] if the module has any definitions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	9/5	Mathlib/CategoryTheory/MarkovCategory/Positive.lean,Mathlib/Tactic/Linter/PrivateModule.lean,MathlibTest/PrivateModuleLinter/reservedName2.lean	3	9	['JovanGerb', 'github-actions', 'grunweg', 'joneugster', 'leanprover-radar']	JovanGerb assignee:JovanGerb	4-56675 4 days ago	4-56675 4 days ago	1-80663 1 day
36806	grunweg author:grunweg	fix(Tactic/Continuity): mark Continuous.comp' as unsafe	This issue was pre-existing: `Continuous.comp'` was never full safe, as a constant function could be written as the composition of any function and a constant function (and then applying the lemma could lead to something unprovable). The change in #31607 triggered such a case: make is an unsafe rule with very high probability instead. This change broke three proofs: one was easy to switch to fun_prop; the others seemed to depend on this being a safe rule. I have added a workaround for now. There was another test failure, exposing a pre-existing internal bug in aesop. With smaller imports, continuity succeeds [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/aesop.20error.20during.20proof.20reconstruction.2C.20goal.20not.20normalised/with/580202602), so I have accepted this result as fine. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	54/2	Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Topology/Continuous.lean,MathlibTest/Continuity.lean	5	4	['github-actions', 'joneugster']	joneugster assignee:joneugster	4-56144 4 days ago	4-56144 4 days ago	56-81666 56 days
39064	kim-em author:kim-em	feat: make showLinter detect tactics that assign metavariables	This PR removes a short-circuit in `showLinter` that suppressed the linter whenever the syntactic goal was unchanged by a `show` tactic. A `show` invocation can still have side-effects on the metavariable context — tactic elaboration may assign metavariables while leaving the goal type unchanged — so the existing `instantiateMVars`-based diff check should run unconditionally. The fast path for the genuine no-op case is preserved: if `before` and `after` types still match after `instantiateMVars`, the linter doesn't fire. This was discovered while adapting Mathlib to nightly-2026-05-03 in https://github.com/leanprover-community/mathlib4-nightly-testing/pull/215 and is being extracted here so it can land independently of that bump. 🤖 Prepared with Claude Code	t-linter delegated	1/1	Mathlib/Tactic/Linter/Style.lean	1	3	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	thorimur assignee:thorimur	4-55724 4 days ago	4-55725 4 days ago	6-25575 6 days
39259	jcommelin author:jcommelin	chore(Tactic/StacksAttribute): add deprecated module	This PR adds `Tactic/StacksAttribute.lean` back as deprecated_module. --- - [x] depends on: #39257, where the file is removed [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated auto-merge-after-CI	7/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/StacksAttribute.lean	3	5	['adomani', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	adomani assignee:adomani	4-55347 4 days ago	6-45947 6 days ago	0-3182 53 minutes
35216	kim-em author:kim-em	doc(Tactic/Translate/ToDual): add deployment guide for @[to_dual]	This PR expands the documentation for `@[to_dual]` with practical advice for deploying it to existing code. Module docstring (`Mathlib/Tactic/Translate/ToDual.lean`): adds a "Deploying `@[to_dual]` to existing code" section covering name agreement, attribute propagation, docstring syntax ordering, declaration order dependencies, and known structural mismatches (conjunct reordering, type class gaps, interval argument swapping). Attribute docstring: adds a note that `@[simp]` is not auto-copied (must use `(attr := simp)`), and shows the correct ordering when combining `(attr := ...)` with docstrings. 🤖 Prepared with Claude Code --- @joneugster: this is no longer part of the PR, so I removed it from the description: > Agent skill (`.claude/skills/to_dual/SKILL.md`): detailed step-by-step instructions for an AI agent deploying `@[to_dual]`, including how to identify candidates, common patterns, and debugging.	documentation LLM-generated maintainer-merge	31/3	Mathlib/Tactic/Translate/ToDual.lean	1	31	['JovanGerb', 'MichaelStollBayreuth', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts', 'vihdzp']	joneugster assignee:joneugster	4-54376 4 days ago	31-20012 31 days ago	38-6691 38 days
38199	vihdzp author:vihdzp	chore: add items to set theory overview	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation t-set-theory maintainer-merge	11/2	docs/overview.yaml	1	5	['SnirBroshi', 'github-actions', 'joneugster', 'vihdzp']	alreadydone assignee:alreadydone	4-54249 4 days ago	30-73025 30 days ago	30-73117 30 days
37666	TJHeeringa author:TJHeeringa	feat(Analysis/InnerProductSpace/Reproducing): Lipschitz wrt the kernel pseudometric	--- RKHSs $H$ have bounded point evaluations. This induces a pseudometric on the underlying space `X`. The function $f\in H$ are Lipschitz continuous with Lipschitz constant $\\|\|f\\|\|$. This PR puts the pseudometric instance inline. The instance cannot just be put outside the theorem, because that gives problems with resolving type classes / instance synthesis. An alternative to inlining the instance is a type class synonym. One copy would be the RKHS with whatever metric X came equipped with and one copy would be the RKHS with the induced metric. Since there are likely more theorems depending on this pseudometric, I suspect that it is actually a better solution. AI: I had the instance outside the theorem. Lean gave problems with resolving type classes / instance synthesis. I asked Claude and ChatGPT to interpret the error and fix it. The latter just spit gibberish and the former suggested inlining but in a way that didn't work. Then, I asked on Zulip and got the same suggestion but working. The type synonym alternative was also suggested there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor help-wanted	71/6	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	3	['TJHeeringa', 'github-actions']	nobody	4-53463 4 days ago	unknown	0-0 0 seconds
38376	smmercuri author:smmercuri	refactor(Algebra): semialgebra maps	--- - [x] depends on: #38715 - [ ] depends on: #38964 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	773/585	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/Notation.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SplittingField/IsSplittingField.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/Adjoin/Field.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Derivation/ToSquareZero.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Etale/StandardEtale.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/Norm/Transitivity.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/Unramified/Pi.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/Module/Spaces/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,MathlibTest/GalNotation.lean	66	11	['github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	nobody	4-52992 4 days ago	26-46742 26 days ago	0-8 8 seconds
38380	linesthatinterlace author:linesthatinterlace	feat(Data/Set): add Set.diag API	Introduces `Set.diag (s : Set α) : Set (α × α) = {(a, a) \| a ∈ s}` as the set-level companion to `Set.offDiag`, mirroring the existing `Finset.diag` / `Finset.offDiag` pairing. The type-level `Set.diagonal : Type* → Set (α × α)` is retained unchanged; `diag_univ : (univ : Set α).diag = diagonal α` (`@[simp]`) keeps it canonical when the underlying set is `univ`. Parallels to the existing `offDiag` API (`diag_mono`, `diag_nonempty`, `diag_eq_empty`, `diag_empty`, `diag_singleton`, `diag_subset_prod`, `diag_eq_sep_prod`, `diag_inter`, `diag_union`, `diag_insert`) plus bridges `diag_union_offDiag`, `disjoint_diag_offDiag`, `prod_sdiff_diag`, `prod_sdiff_offDiag`. Also `diag_eq_image`, `image_diag` (matching `Finset.image_diag`), `preimage_coe_coe_diag`, and `Finset.coe_diag`. Note `diag_union` and `diag_insert` are unconditional (no `Disjoint` / `a ∉ s` hypothesis). To free the `diag_` prefix for the set sense, the existing lemmas about the diagonal map `fun x => (x, x)` are renamed with deprecation aliases: `range_diag` → `range_diagMap`, `diag_preimage_prod` → `diagMap_preimage_prod`, `diag_preimage_prod_self` → `diagMap_preimage_prod_self`. `diag_image` and `preimage_coe_coe_diagonal` are marked `@[deprecated]`. This PR was prepared with the assistance of Claude Opus.	t-data LLM-generated	124/15	Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/NhdsSet.lean	7	2	['github-actions', 'linesthatinterlace']	joneugster assignee:joneugster	4-50768 4 days ago	26-30181 26 days ago	26-30174 26 days
36155	grunweg author:grunweg	feat: custom elaborators for TangentSpace and tangentMap(Within)	And use these to golf the differential geometry files a bit further. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta awaiting-author	85/30	Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Topology/FiberBundle/Constructions.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean	8	7	['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash']	JovanGerb assignee:JovanGerb	4-50439 4 days ago	4-50439 4 days ago	69-16913 69 days
38983	kebekus author:kebekus	feat: Invariance of `meromorphic in normal form` under composition.	Establish invariance of `meromorphic in normal form` under composition with analytic functions of non-vanishing derivative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	42/0	Mathlib/Analysis/Meromorphic/NormalForm.lean	1	12	['github-actions', 'kebekus', 'themathqueen']	themathqueen assignee:themathqueen	4-48201 4 days ago	4-48201 4 days ago	11-69193 11 days
37413	Paul-Lez author:Paul-Lez	feat(Combinatorics/Enumerative/Composition): add lemma about products of embeddings	Co-authored-by: Xavier Genereux [xaviergenereux@hotmail.com](mailto:xaviergenereux@hotmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	4/0	Mathlib/Combinatorics/Enumerative/Composition.lean	1	3	['github-actions', 'robin-carlier']	nobody	4-47671 4 days ago	5-45445 5 days ago	15-74386 15 days
39003	TwoFX author:TwoFX	chore: avoid declaring duplicate instances `LE String` and `LT String`	Since forever, mathlib has declared `LE String` and `LT String` instances which are propositionally, but not definitionally, equal to the `LE String` and `LT String` instances that have shipped with core. This regularly leads to problems with automation that expects instances to be canonical, most recently as described in leanprover/lean4#13544. This PR demotes the mathlib instances to definitions, and redefines the `LinearOrder String` instance to use the core-provided instances rather than the ones defined in mathlib. It also redeclares the theorems `String.lt_iff_toList_lt` and `String.le_iff_toList_le` to be about the core-provided instances rather than the mathlib ones, and the theorems about the mathlib instances are now called `String.lt_iff_toList_lt'` and `String.le_iff_toList_le'`. Deprecating the material related to the mathlib instances would be a logical next step, but it might make sense to wait with this until core ships more API for `LE String` and `LT String` (right now it ships none). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	31/14	Mathlib/Data/String/Basic.lean	1	8	['TwoFX', 'eric-wieser', 'github-actions', 'joneugster']	joneugster assignee:joneugster	4-47456 4 days ago	4-49320 4 days ago	7-32948 7 days
38347	artie2000 author:artie2000	doc(LinearAlgebra/FreeModule/StrongRankCondition): clarify context of `commRing_strongRankCondition`	* Replace mathematical documentation in `Mathlib.LinearAlgebra.FreeModule.StrongRankCondition`, with explanation that the file comprises a shortcut instance `commRing_strongRankCondition` * Signpost `commRing_strongRankCondition` at both its parent instances * Increase priority of shortcut instance `commRing_strongRankCondition` above that of its parent instances --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	28/41	Mathlib/LinearAlgebra/FreeModule/StrongRankCondition.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/RingTheory/FiniteType.lean	3	3	['github-actions', 'joneugster', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	4-45355 4 days ago	4-45355 4 days ago	22-40813 22 days
39372	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable`	- rewrites `eisensteinSeriesSIF_mdifferentiable` to use `UpperHalfPlane.mdifferentiable_iff` directly and conclude from local uniform convergence of the Eisenstein series Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	1/5	Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable.lean	1	3	['github-actions', 'yuanyi-350']	nobody	4-44885 4 days ago	4-46619 4 days ago	4-46612 4 days
39373	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/CongruenceSubgroups`	- simplifies `Gamma_mem` to a single `simp` proof via `Gamma_mem'` and `SpecialLinearGroup.ext_iff` - shortens `ModularGroup_T_pow_mem_Gamma` and the `Gamma0` closure proofs with direct `simp`/`simpa` arguments Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/22	Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-44884 4 days ago	4-46617 4 days ago	4-46610 4 days
33985	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): `OmegaCompletePartialOrder` instance for `Sum` with basic `ωScottContinuous` lemmas	This PR adds an `OmegaCompletePartialOrder` instance for `Sum`, along with `ωScottContinuous` lemmas for basic operations (`inl`, `inr`, `elim`). Appropriate lemmas are marked with `@[fun_prop]` so that the `fun_prop` tactic can automatically deduce `ωScottContinuous` proofs for functions involving `Sum`s (e.g. see the proof of `Sum.ωScottContinuous_map`). --- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import t-order awaiting-author	205/3	Mathlib/Data/Sum/Basic.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/ScottContinuity.lean,Mathlib/Topology/Constructions/SumProd.lean	5	58	['Komyyy', 'Vierkantor', 'YaelDillies', 'YellPika', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	YaelDillies and pechersky assignee:pechersky assignee:YaelDillies	4-44792 4 days ago	45-50602 45 days ago	52-59724 52 days
39374	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/Derivative`	- rewrites `normalizedDerivOfComplex_sub` to reuse the additive and negation lemmas instead of reproving the subtraction formula pointwise Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/10	Mathlib/NumberTheory/ModularForms/Derivative.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-44678 4 days ago	4-46614 4 days ago	4-46607 4 days
39375	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/ModularForms/SlashActions`	- streamlines `prod_slash_sum_weights` by letting `simp` handle the empty case and removing the redundant singleton split in the inductive step Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	1/5	Mathlib/NumberTheory/ModularForms/SlashActions.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-44521 4 days ago	4-46611 4 days ago	4-46604 4 days
39353	Raph-DG author:Raph-DG	feat(Topology): Show existence of a neighbourhood around p which avoids all points in the support of a locally finsupp function except those which specialize to p	In this PR we show a simple lemma proving the existence of a neighbourhood around any point p which avoids every point in the support of a locally finsupp function except those which specialize to p. AI disclosure: The statements and a sketch with sorries were provided by me, but I had claude fill in the sorries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	29/0	Mathlib/Topology/LocallyFinsupp.lean	1	1	['github-actions']	nobody	4-44440 4 days ago	4-44452 4 days ago	0-31335 8 hours
39376	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/RamificationInertia/Basic`	- shortens `quotientToQuotientRangePowQuotSucc_surjective` by switching the ideal-factor argument to `irreducible_pow_sup` and `count_normalizedFactors_eq` after isolating the span hypotheses Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/10	Mathlib/NumberTheory/RamificationInertia/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-44349 4 days ago	4-46609 4 days ago	4-46602 4 days
39379	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/SmoothNumbers`	- simplifies the left inverse in `equivProdNatFactoredNumbers` by proving `¬ p ∣ m` once and then using `factorization_pow_self` and `factorization_eq_zero_of_not_dvd` Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	4/8	Mathlib/NumberTheory/SmoothNumbers.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-43695 4 days ago	4-46601 4 days ago	4-46594 4 days
39377	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): golf `Mathlib/NumberTheory/Divisors`	- refactors `properDivisors_eq_singleton_one_iff_prime`, `mem_properDivisors_prime_pow`, and `properDivisors_prime_pow` to use more direct divisor lemmas - rewrites `image_div_divisors_eq_divisors` via `map_div_left_divisors` and `image_fst_divisorsAntidiagonal` Extracted from #38144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	17/42	Mathlib/NumberTheory/Divisors.lean	1	2	['github-actions', 'yuanyi-350']	nobody	4-43479 4 days ago	4-46606 4 days ago	4-46599 4 days
38534	AlexeyMilovanov author:AlexeyMilovanov	refactor(Computability): bundle PFun into a structure with FunLike instance	This PR refactors `PFun` from `def PFun α β := α → Part β` to a structure with a `FunLike` instance. [Discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Fix.20for.20fun_prop.20on.20PFun.20.28context.3A.20Computability.20Theory.29) ### Core Architectural Changes * Structure Transition: `PFun` is now a structure with a single field `toFun : α → Part β`. Raw lambdas are now explicitly packed using `PFun.mk` or `PFun.lift`. * API Alignment: Added the `FunLike (α →. β) α (Part β)` instance and `initialize_simps_projections`. Replaced direct `funext` usage with `DFunLike.ext`. Added comprehensive `@[simp]` lemmas for the structure (`mk_apply`, `coe_mk`, `toFun_eq_coe`, `lift_apply`). * New Helpers: Introduced `PFun.const` and `PFun.empty` to reduce boilerplate. Updated the `Inhabited` instance to use `PFun.empty` and added the `default_eq_empty` simp lemma. * Renaming: Renamed `Nat.Partrec.some` to `Nat.Partrec.id` (as it now represents `PFun.id ℕ`), and `const_part_some` to `const_some` for consistency. ### API & Breaking Changes * Loss of Defeq: `PFun` is no longer definitionally equal to a raw function. Basic lemmas (like `PFun.res_univ`) now require explicit extensionality (`ext x y; rfl`). * `prodLift_fst_comp_snd_comp`: Rewrote the LHS using explicit `PFun.mk` wrappers. This resolves a `simpNF` linter failure caused by the new `comp_lift` simp lemma. * Return Type Changes: Several core computability definitions (`Nat.Partrec.of_eq_tot`, `StateTransition.eval`) now strictly return or pattern-match on the new structure, breaking implicit coercions. ### Downstream Impact The refactor heavily impacts Computability Theory and Category Theory (`Category/PartialFun.lean`). The strict structure boundary breaks definitional equality, meaning tactics like `simp` and `grind` can no longer "see through" the function automatically. As a result, several proofs (e.g., `fix_aux`, `ppred`, `mem_eval`, and `unitIso`) grew in size, requiring explicit `ext` + `simp` breakdowns. ### Affected Files * Core: `Mathlib/Data/PFun.lean` * Computability: `Partrec`, `PartrecBasis`, `PartrecCode`, `RE`, `RecursiveIn`, `Ackermann`, `Halting`, `StateTransition`, `TuringDegree`, `TuringMachine/Config` (Successfully removed the `set_option linter.flexible false` hack) * Category Theory: `Category/PartialFun.lean` (Successfully removed the `respectTransparency false` hack) * Other: `Data/Finset/PImage.lean`, `NumberTheory/Dioph.lean` ### Note on LLM usage The core `PFun` change caused numerous downstream errors. I initially used an LLM to help draft fixes for these files. Afterwards, I spent a significant amount of time manually correcting and modifying all of the generated changes.	new-contributor t-computability awaiting-author	1172/758	Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecBasis.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/RE.lean,Mathlib/Computability/RecursiveIn.lean,Mathlib/Computability/StateTransition.lean,Mathlib/Computability/TuringDegree.lean,Mathlib/Computability/TuringMachine/Config.lean,Mathlib/Data/Finset/PImage.lean,Mathlib/Data/PFun.lean,Mathlib/NumberTheory/Dioph.lean	14	8	['AlexeyMilovanov', 'dagurtomas', 'github-actions', 'j-loreaux', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	4-42266 4 days ago	4-42267 4 days ago	8-27743 8 days
39139	or4nge19 author:or4nge19	feat(LinearAlgebra): Schur triangulation	Adds Schur triangulation API for algebraically closed `RCLike`, proved by triangularizing an endomorphism, aiming at a more mathlib idiomatic approach than the original one in #20730 as it now (better) specializes the existing triangularization API and generalizes supporting lemmas in more natural places. A prerequisite for porting `Matrix.det_exp` proof from physlib. It also proves half of existing TODO in Eigenspace.Triangularizable. It may need a split into 2 PRs and coordination with #37006 . See [this](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Contribute.20Schur.20decomposition/with/532385359) and [this](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/.28Matrix.20and.20NormedSpace.2Eexp.29.20.7C.20det.20.28exp.20A.29.20.3D.20exp.20.28trace.20A.29/with/581264603) zulip discussions. Co-authored-by: [kuotsanhsu](https://github.com/kuotsanhsu) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-author	687/75	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/Triangularizable.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Basis/Flag.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Basic.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean	10	4	['dagurtomas', 'github-actions', 'or4nge19', 'wwylele']	nobody	4-41293 4 days ago	4-41293 4 days ago	4-23931 4 days
39384	EngelsVon author:EngelsVon	feat(Analysis/Calculus/DifferentialForm): Stokes' theorem on rectangular boxes	## Summary This PR proves the generalized Stokes theorem for differential forms on rectangular boxes $[a, b] \subset \mathbb{R}^{m+1}$. The proof strategy is: 1. Extract the `i`-th signed face component `boxFaceComponent ω i` from an `m`-form `ω` — a scalar function whose divergence equals the top-form density of the exterior derivative `dω`. 2. Apply Mathlib's existing divergence theorem for boxes (`integral_divergence_of_hasFDerivAt_off_countable'`). This gives a genuine proved Stokes formula in the Euclidean setting, complementing the existing infrastructure for differential forms. ## Main definitions - `DifferentialForm.topFormDensity`: density function of a top-form field - `DifferentialForm.boxFaceComponent`: the `i`-th signed face component of an `m`-form on `ℝ^(m+1)` - `DifferentialForm.boxBoundaryIntegral`: the signed boundary integral over `∂[a,b]` ## Main results - `box_stokes_of_hasFDerivAt`: Stokes' theorem on boxes with pointwise differentiability hypotheses - `box_stokes_of_contDiff`: a convenient `C¹` formulation	t-analysis new-contributor	314/0	Mathlib.lean,Mathlib/Analysis/Calculus/DifferentialForm/BoxStokes.lean	2	2	['github-actions']	nobody	4-39077 4 days ago	4-39186 4 days ago	4-39179 4 days
37722	SabrinaJewson author:SabrinaJewson	feat(Order/Cover): intervals equal singletons iff	To complement `Set.Icc_eq_singleton_iff`, this introduces: - `Set.Ioc_eq_singleton_iff` / `Set.Ico_eq_singleton_iff` - `Set.Ico_eq_singleton_left_iff` / `Set.Ioc_eq_singleton_right_iff` - `Set.Ioi_eq_singleton_iff` / `Set.Iio_eq_singleton_iff` - `Set.Ioi_eq_singleton_top_iff` / `Set.Iio_eq_singleton_bot_iff` - `Set.Ioo_eq_singleton_iff` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor awaiting-author maintainer-merge	39/0	Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean	2	16	['Komyyy', 'SabrinaJewson', 'github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	4-36749 4 days ago	6-76106 6 days ago	35-12445 35 days
39383	fpvandoorn author:fpvandoorn	fix: use notation3 more	* `notation3` is better at generating delaborators in the presence of implicit arguments, other notation and some other complications. * I explicitly tested that each change was not correctly pretty-printed before, but now is. * Add spaces around the global notation `^+` (that maybe shouldn't be global at all?) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/21	Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Data/Sum/Order.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	10	1	['github-actions']	nobody	4-35754 4 days ago	4-41324 4 days ago	4-41317 4 days
35281	harahu author:harahu	chore: fix markdown list indentation	WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	788/413	Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Homology/SpectralSequence/ComplexShape.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/LFunction.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Flat.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subdivision.lean,Mathlib/AlgebraicTopology/SimplicialSet/TopAdj.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/Convex/KreinMilman.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Normed/Field/Approximation.lean,Mathlib/Analysis/Normed/Field/Dense.lean,Mathlib/Analysis/Normed/Field/Krasner.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Completion.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/CategoryTheory/Abelian/Preradical/Colon.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Category/ULift.lean,Mathlib/CategoryTheory/GlueData.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/ChosenPullback.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Point/OfIsCofiltered.lean,Mathlib/CategoryTheory/Sites/PrecoverageToGrothendieck.lean,Mathlib/CategoryTheory/WithTerminal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/PerfectPairing/Basic.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Order/UpperLower.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Zorn.lean,Mathlib/RingTheory/Smooth/Flat.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Spectrum/Prime/Jacobson.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/ZariskisMainTheorem.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CancelIso.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/DepRewrite.lean,Mathlib/Tactic/Finiteness.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/PositiveVector.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean,Mathlib/Topology/Category/Profinite/AsLimit.lean,Mathlib/Topology/Continuous.lean,Mathlib/Topology/DiscreteQuotient.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Maps/Proper/Basic.lean,Mathlib/Topology/MetricSpace/UniformConvergence.lean,Mathlib/Topology/Sheaves/Presheaf.lean,Mathlib/Topology/Sheaves/Sheaf.lean,Mathlib/Topology/Sheaves/SheafOfFunctions.lean,Mathlib/Topology/Sion.lean,scripts/check_docstring_list_indentation.py	94	15	['github-actions', 'harahu', 'mathlib-merge-conflicts']	nobody	4-35440 4 days ago	unknown	0-0 0 seconds
39026	fpvandoorn author:fpvandoorn	feat: add assume tactic	Teaching tactic: `assume p, q, r` is short for `intro (_ : p) (_ : q) (_ : r)`. --- [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Assume.20tactic/with/593477478) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-meta awaiting-author	123/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Assume.lean,MathlibTest/Assume.lean	4	7	['fpvandoorn', 'github-actions', 'joneugster']	joneugster assignee:joneugster	4-34036 4 days ago	11-67946 11 days ago	0-1 1 second
35896	harahu author:harahu	chore(misc): fix typos	The typos were identified by `PyCharm`'s proofreading inspection. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		34/32	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Control/Traversable/Equiv.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Data/TypeVec.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Sheaves/CommRingCat.lean,docs/references.bib	21	9	['euprunin', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	4-33256 4 days ago	68-18241 68 days ago	7-55245 7 days
39371	fpvandoorn author:fpvandoorn	feat: tag lemmas with compactness and closedness	--- - [ ] depends on: #39370 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	190/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	13	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-33121 4 days ago	4-47392 4 days ago	0-1 1 second
35686	harahu author:harahu	chore: run docstrings through mdformat	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	10282/5889	Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Gaps.lean,Mathlib/Algebra/BigOperators/Group/Finset/Indicator.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/EquivalenceGroupAddGroup.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Projective.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/Epi.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/CharAndCard.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/LinearMaps.lean,Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/ContinuedFractions/ContinuantsRecurrence.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/EuclideanDomain/Int.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/Periodic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/FreeMonoid/FreeSemigroup.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Center.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Hom/CompTypeclasses.lean,Mathlib/Algebra/Group/Hom/Defs.lean	2809	2	['github-actions', 'mathlib-merge-conflicts']	nobody	4-32361 4 days ago	unknown	0-0 0 seconds
39382	fpvandoorn author:fpvandoorn	feat: add some lemmas that closures of some sets are compact	* Also tag them with `closedness`/`compactness`. * This can be refactored to use `RelativelyCompact` once we define that notion. * Note: this is only equivalent to `IsBounded` in `ProperSpace`. It is equivalent to `@IsBounded _ (inCompact X) s` in a T2-space, but the latter thing is cumbersome to write. --- - [ ] depends on: #39371 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	265/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	14	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-29032 4 days ago	4-43132 4 days ago	0-359 5 minutes
36541	BGuillemet author:BGuillemet	feat(CategoryTheory): define internal equivalence relations	Define internal equivalence relations in any category `C`, as a structure on parallel pairs of morphisms. Prove that equivalence relations on types are equivalence relations in the category of types. Prove that kernel pairs are equivalence relations. Define (universally) effective equivalence relations, and a associated class for categories in which every equivalence relation is effective universal. Prove that an effective equivalence relation yields a coequalizer diagram, and that the associated projection on the "quotient" of the relation is a regular epimorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	320/0	Mathlib.lean,Mathlib/CategoryTheory/EquivalenceRelation.lean,Mathlib/CategoryTheory/Limits/Shapes/RegularMono.lean	3	26	['BGuillemet', 'chrisflav', 'dagurtomas', 'github-actions', 'robin-carlier']	b-mehta assignee:b-mehta	4-26445 4 days ago	4-57611 4 days ago	25-70268 25 days
39387	marcelolynch author:marcelolynch	feat(Tactic/Linter): add superfluousExpose linter	Dual of `privateModule`: lints against modules with `@[expose] public section` where no declaration needs its body visible downstream. Suggests removing the `@[expose]` modifier. A declaration 'benefits from exposure' iff its body matters to downstream typechecking: plain `def`, plain `inductive`, `@[match_pattern]` def, `@[irreducible] def` / `irreducible_def`, or a `@[to_additive]`-decorated def. Theorems, abbrevs, classes, structures, instances, `unsafe`/`partial` defs, compiler-generated auxiliaries, projections, matchers, and notation- generated parser entries do not. The linter is conservative: known limitations produce a false negative (scoped/local instances and tactic-implementation defs may stay silent), never a false positive that would break downstream builds. Includes test files covering positive and negative cases. Relevant Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Removing.20unnecessary.20.60.40.5Bexpose.5D.60/with/595180230	t-linter LLM-generated	897/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/SuperfluousExpose.lean,MathlibTest/Linter/SuperfluousExpose.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ExposeInBlockComment.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ExposeOnNonPublicSection.lean,MathlibTest/Linter/SuperfluousExpose/Negative_Inductive.lean,MathlibTest/Linter/SuperfluousExpose/Negative_InstPrefixedDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_IrreducibleDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_LocalInstance.lean,MathlibTest/Linter/SuperfluousExpose/Negative_MatchPattern.lean,MathlibTest/Linter/SuperfluousExpose/Negative_NoExposeSection.lean,MathlibTest/Linter/SuperfluousExpose/Negative_PlainDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ScopedInstance.lean,MathlibTest/Linter/SuperfluousExpose/Negative_TermPrefixedDef.lean,MathlibTest/Linter/SuperfluousExpose/Negative_ToAdditive.lean,MathlibTest/Linter/SuperfluousExpose/Positive_AbbrevOnly.lean,MathlibTest/Linter/SuperfluousExpose/Positive_ClassOnly.lean,MathlibTest/Linter/SuperfluousExpose/Positive_Notation.lean,MathlibTest/Linter/SuperfluousExpose/Positive_PartialDef.lean,MathlibTest/Linter/SuperfluousExpose/Positive_Recursors.lean,MathlibTest/Linter/SuperfluousExpose/Positive_TheoremOnly.lean,MathlibTest/Linter/SuperfluousExpose/Positive_UnsafeDef.lean	23	2	['eric-wieser', 'github-actions']	nobody	4-22146 4 days ago	unknown	0-0 0 seconds
36239	plp127 author:plp127	feat(FieldTheory/KrullTopology): define uniform group structure on galois group	Endow the galois group of a field extension `Gal(L/K)` with the structure of a uniform group. Use this to prove some properties of the galois group earlier, for example, that the galois group is compact is immediate, and in more generality than the version proved in `FieldTheory/Galois/Profinite`. Deprecate some material which used to be used to define the krull topology, but is now unused since the krull topology comes out of the uniform structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	292/220	Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean	4	20	['dagurtomas', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	mattrobball assignee:mattrobball	4-20657 4 days ago	4-20690 4 days ago	50-78930 50 days
37071	ericluap author:ericluap	feat: Dedekind completion of rationals is isomorphic to EReal		t-order new-contributor	128/4	Mathlib.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/DedekindCut.lean,Mathlib/Order/Completion.lean	4	55	['ericluap', 'github-actions', 'vihdzp', 'wwylele']	vihdzp assignee:vihdzp	4-14258 4 days ago	7-45499 7 days ago	30-40680 30 days
37183	dagurtomas author:dagurtomas	feat(Tactic/CategoryTheory): map attribute	Adding `@[map]` to a lemma named `H` of shape `∀ .., f = g`, where `f` and `g` are morphisms in some category `C`, creates a new lemma named `H_map` of the form `∀ .. {D} (func : C ⥤ D), F.map f = F.map g` and then applies `simp only [Functor.map_comp, Functor.map_id]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	LLM-generated t-meta t-category-theory	290/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean	5	11	['adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	kim-em assignee:kim-em	4-12543 4 days ago	28-584 28 days ago	53-84171 53 days
38095	astrainfinita author:astrainfinita	perf(Algebra/*/{InjSurj, TransferInstance}): reduce instance `Expr`s	--- We can not just use `fast_instance%`, because `fast_instance%` reduces instances into constructor applications, but their arguments may still not be reduced. This PR continues the work from #13795. Original PR: https://github.com/leanprover-community/mathlib4/pull/13795 [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/instance.20unfolding.20phenomenon/)	t-algebra label:t-algebra$	401/219	Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/TransferInstance.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/TransferInstance.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Action/TransferInstance.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/TransferInstance.lean,Mathlib/Util/TermReduce.lean,scripts/noshake.json	16	7	['astrainfinita', 'github-actions', 'leanprover-radar']	jcommelin assignee:jcommelin	4-12540 4 days ago	33-3017 33 days ago	33-5540 33 days
38723	xgenereux author:xgenereux	feat(EuclideanDomain.Basic): RingEquiv.euclideanDomain	Add `RingEquiv.euclideanDomain` similar to other `RingEquiv` transport lemmas. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	26/1	Mathlib/Algebra/EuclideanDomain/Basic.lean	1	3	['github-actions', 'wwylele']	dagurtomas assignee:dagurtomas	4-12536 4 days ago	19-43600 19 days ago	19-43960 19 days
38825	tb65536 author:tb65536	feat(RingTheory/Spectrum/FreeLocus): rank of fiber over residue field	This PR proves the formula `finrank p.ResidueField (p.Fiber M) = finrank R M`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	9/0	Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean	1	1	['github-actions']	jcommelin assignee:jcommelin	4-12535 4 days ago	17-23093 17 days ago	17-23088 17 days
39192	jayscambler author:jayscambler	feat(InnerProductSpace/PiL2): det of a linear isometry has unit norm	Adds `LinearIsometryEquiv.norm_det` and the real corollary `LinearIsometryEquiv.abs_det`. The proof uses the unitary matrix of a linear isometry in orthonormal bases, via `LinearIsometryEquiv.toMatrix_mem_unitaryGroup` and `Matrix.det_of_mem_unitary`. The supporting matrix lemma is moved from `Adjoint.lean` to `PiL2.lean`, where it no longer depends on adjoints.	t-analysis new-contributor LLM-generated	36/10	Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean	2	8	['github-actions', 'grunweg', 'jayscambler', 'themathqueen', 'wwylele']	sgouezel assignee:sgouezel	4-12534 4 days ago	7-41466 7 days ago	7-61047 7 days
39395	marcelolynch author:marcelolynch	chore(Tactic/Linter): reword PrivateLinter suggestion	This matches the granular-by-default philosophy of the new module system and produces files without superfluous `@[expose] public`, which we also want to flag as undesirable: we steer to making every @[expose] is per-decl and intentional, rather than section-wide Relevant Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Removing.20unnecessary.20.60.40.5Bexpose.5D.60/with/595180230	t-linter	11/8	Mathlib/Tactic/Linter/PrivateModule.lean,MathlibTest/PrivateModuleLinter/hasOnlyPrivate.lean,MathlibTest/PrivateModuleLinter/notation3.lean,MathlibTest/PrivateModuleLinter/reservedName2.lean	4	3	['github-actions', 'grunweg', 'marcelolynch']	JovanGerb assignee:JovanGerb	4-8956 4 days ago	4-23062 4 days ago	4-23055 4 days
37248	harahu author:harahu	doc(Tactic): avoid lazy continuation lines	We resolve the ambiguity inherent in lazy (un-indented) list item continuation lines by either indenting them or separating them by inserting a newline in the cases where the item continuation was a mistake. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	123/114	Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/DepRewrite.lean,Mathlib/Tactic/Finiteness.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean	15	4	['Multramate', 'github-actions', 'grunweg', 'harahu', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	4-8445 4 days ago	4-35938 4 days ago	52-43236 52 days
39392	jayscambler author:jayscambler	feat(Cryptography): one-time pad and Shannon perfect secrecy	Adds `Mathlib/Cryptography/OTP.lean`. One-time pad over an arbitrary finite abelian group `G`: - `OTP.encrypt k m := m + k`, `OTP.decrypt k c := c - k`. - `OTP.correct`: `decrypt k (encrypt k m) = m`, by `abel`. - `OTP.perfect_secrecy`: for any `m₀, m₁`, the distributions of `encrypt k m₀` and `encrypt k m₁` over uniform `k` are equal; both reduce to `PMF.uniformOfFintype G`. Proof goes via `Equiv.addLeft`. Independent of the Schnorr PR (#39279); no shared definitions. Unlike everything else likely to live under `Mathlib/Cryptography/`, the security guarantee here is information-theoretic, not computational. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	76/0	Mathlib.lean,Mathlib/Cryptography/OTP.lean	2	3	['MrBrain295', 'github-actions']	nobody	4-8339 4 days ago	4-30813 4 days ago	4-30806 4 days
39402	marcelolynch author:marcelolynch	feat(ci): add Lake cache shadow workflow for master	Introduces a scheduled, non-blocking pipeline that exercises Lake's built-in artifact cache against mathlib master, tracking the eventual migration off `lake exe cache` The workflow runs daily on cron and on workflow_dispatch. Jobs: build_and_stage: 1. Hydrates .lake/build/ via legacy `lake exe cache get` 2. patches the lakefile to enable Lake's artifact cache with three knobs 3. runs an incremental `lake build` to populate Lake's cache from existing artifacts 4. uploads cache artifact for next job. upload: Downloads the staging artifact and pushes it to the cache bucket via `lake cache put-staged`. consume: - `lake cache get` from the cache bucket - `lake build` against the rehydrated cache, `--rehash` verify.	CI	406/0	.github/workflows/lake_cache_shadow.yml	1	2	['github-actions', 'marcelolynch']	nobody	4-8099 4 days ago	4-11885 4 days ago	4-11878 4 days
34507	metakunt author:metakunt	feat(NumberTheory/AKSPrimality): Adds the AKS primality test	Adds the completed proof for the AKS primality test. Everything except the final theorem is marked private as it's only needed for the final proof. Also everything except the final theorem is namespaced with AKS. ---- Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Aks.20primality.20Theorem.206.2E1.20Claim.20.28i.29.20proven - [ ] depends on: #39404	t-number-theory awaiting-author blocked-by-other-PR	645/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	61	['MichaelStollBayreuth', 'dagurtomas', 'github-actions', 'jcommelin', 'kim-em', 'mathlib-bors', 'mathlib-dependent-issues', 'metakunt', 'qawbecrdtey', 'tb65536', 'vihdzp']	tb65536 assignee:tb65536	4-425 4 days ago	4-37273 4 days ago	76-34349 76 days
39393	jayscambler author:jayscambler	feat(GameTheory): von Neumann minimax theorem for finite matrix games	Adds `Mathlib/GameTheory/MatrixGame.lean`. Resolves the TODO at `Mathlib/Topology/Sion.lean:48` ("spell out the particular case of von Neumann theorem") by specialising `Sion.exists_isSaddlePointOn` to the bilinear payoff `∑ i j, x i * M i j * y j` on the pair of standard simplices. Two theorems: - `Matrix.exists_saddle_point`: existence of a saddle point in mathlib's `IsSaddlePointOn` convention (`a` minimiser-in-`X`, `b` maximiser-in-`Y`). - `Matrix.exists_mixedNash`: existence of a mixed Nash equilibrium in the textbook matrix-game orientation (row player maximises, column player minimises). Proved by applying Sion to `-payoff M`. Both forms are useful: the first matches mathlib's existing saddle-point machinery, and the second is the statement most game-theory texts use directly. Supporting lemmas: continuity of the payoff in each argument (linear in each), and quasi-convexity / quasi-concavity from `LinearMap.convexOn` / `LinearMap.concaveOn`. The simplex hypotheses for Sion (`Convex`, `IsCompact`, `Nonempty`) come from existing mathlib lemmas (`convex_stdSimplex`, `isCompact_stdSimplex`, `single_mem_stdSimplex`). Creates a new top-level `Mathlib/GameTheory/` directory; mathlib currently has none. A natural follow-up would be a `Mathlib/GameTheory/NormalForm.lean` for general n-player normal-form games and pure Nash equilibrium. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	t-topology new-contributor LLM-generated	216/2	Mathlib.lean,Mathlib/GameTheory/MatrixGame.lean,Mathlib/Topology/Sion.lean	3	3	['github-actions', 'vihdzp']	nobody	3-78016 3 days ago	4-25546 4 days ago	0-355 5 minutes
37623	IvanRenison author:IvanRenison	feat(Order/RelIso): add theorems about `RelHom.comp` and `RelEmbedding.trans`	Co-authored-by: SnirBroshi <26556598+SnirBroshi@users.noreply.github.com> --- Missing of this theorems noticed by @SnirBroshi in #37598 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	18/0	Mathlib/Order/RelIso/Basic.lean	1	8	['IvanRenison', 'SnirBroshi', 'dagurtomas', 'eric-wieser', 'github-actions']	nobody	3-69570 3 days ago	43-43040 43 days ago	44-66568 44 days
38714	YaelDillies author:YaelDillies	refactor: make `MonoidAlgebra` into a one-field structure	--- - [x] depends on: #26732 - [x] depends on: #28407 - [x] depends on: #28460 - [x] depends on: #28511 - [x] depends on: #29207 - [x] depends on: #30877 - [x] depends on: #31143 - [x] depends on: #31144 - [x] depends on: #32253 - [x] depends on: #32254 - [x] depends on: #32398 - [x] depends on: #32501 - [x] depends on: #32508 - [x] depends on: #32562 - [x] depends on: #32588 - [x] depends on: #32591 - [x] depends on: #32592 - [x] depends on: #32604 - [x] depends on: #32965 - [x] depends on: #33093 - [x] depends on: #33094 - [x] depends on: #33099 - [x] depends on: #33137 - [x] depends on: #33139 - [x] depends on: #33141 - [x] depends on: #33452 - [x] depends on: #33453 - [x] depends on: #33482 - [x] depends on: #33492 - [x] depends on: #36675 - [ ] depends on: #36746 Port of #25273 to my fork [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR label:t-algebra$	1586/1684	Mathlib/Algebra/FreeAlgebra/Cardinality.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Cardinal.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basis.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Defs.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/OfFn.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Algebra/Polynomial/SumIteratedDerivative.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/Ring/Subring/IntPolynomial.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/Analysis/Fourier/BoundedContinuousFunctionChar.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic.lean,Mathlib/MeasureTheory/Measure/LevyConvergence.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Coalgebra/MonoidAlgebra.lean,Mathlib/RingTheory/Derivation/MapCoeffs.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean,Mathlib/RingTheory/HopfAlgebra/MonoidAlgebra.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/MvPolynomial/EulerIdentity.lean,Mathlib/RingTheory/MvPolynomial/FreeCommRing.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/MvPolynomial/IrreducibleQuadratic.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/QuasiFinite/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/Free.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	97	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-68850 3 days ago	19-51963 19 days ago	0-788 13 minutes
28802	grunweg author:grunweg	feat: a tactic linter for continuity/measurability which can be `fun_prop`	--- Let's see if this finds further locations in mathlib :tada: This PR also runs the linter in mathlib by default. I strongly think this is a good idea --- but leaves all kinds of fun questions around "where do you import this linter best". Opinions on this welcome; this PR is a first start (but no more). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-CI t-meta	72/0	Mathlib/Tactic/Continuity.lean,Mathlib/Tactic/Measurability.lean,MathlibTest/ContinuityToFunprop.lean	3	15	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	3-66863 3 days ago	268-62155 268 days ago	0-260 4 minutes
39296	scholzhannah author:scholzhannah	feat: more informative output messages in the flexible linter	The current output messages in the flexible linter are: - If the stained location is a hypothesis: `'exact h' uses 'h'!` - If the stained location is the goal: `'exact Nat.le_succ_of_le h' uses '⊢'!` I think the first is not very informative and the second is additionally confusing. So I change them to read: - For a hypothesis: `'exact h' uses 'h', which was modified by a flexible tactic!` - And for the goal: `'exact Nat.le_succ_of_le h' modifies the current goal, which was modified by a flexible tactic!` I also added some more explanation to the messages in the case that all the hypotheses and the goal were stained by `simp at *`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	128/25	Mathlib/Tactic/Linter/FlexibleLinter.lean,MathlibTest/FlexibleLinter.lean,MathlibTest/ImportHeavyFlexibleLinter.lean	3	6	['b-mehta', 'github-actions', 'grunweg', 'scholzhannah']	grunweg assignee:grunweg	3-66598 3 days ago	3-66598 3 days ago	3-66591 3 days
38754	EtienneC30 author:EtienneC30	feat: integral of a continuous bilinear map applied to independent random variables	If `X` and `Y` are independent then `∫ ω, X ω * Y ω ∂μ = ∫ ω, X ω ∂μ * ∫ ω, Y ω ∂μ`. We generalize this to the case of a general continuous bilinear map, and specialize it for scalar multiplication and multiplication. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	243/77	Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/Probability/Independence/Integration.lean	2	3	['EtienneC30', 'github-actions', 'sgouezel']	sgouezel assignee:sgouezel	3-64220 3 days ago	3-65886 3 days ago	10-58044 10 days
37745	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/AugmentationIdeal): base change for augmentation ideals	Base change for augmentation ideals Co-authored with: @mariainesdff --- - [x] depends on: #37744 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra large-import label:t-algebra$	441/1	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Projection.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/LinearAlgebra/TensorProduct/Submodule.lean,Mathlib/Order/Disjoint.lean,Mathlib/RingTheory/Ideal/IsAugmentation.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	12	18	['AntoineChambert-Loir', 'dagurtomas', 'github-actions', 'mathlib-dependent-issues']	nobody	3-64078 3 days ago	3-64149 3 days ago	4-38118 4 days
36472	EtienneC30 author:EtienneC30	feat: finite dimensional distribution of Brownian motion	Define `gaussianProjectiveFamily : (I : Finset ℝ≥0) → Measure (I → ℝ)`. Each `gaussianProjectiveFamily I` is the centered Gaussian measure over `I → ℝ` with covariance matrix given by `brownianCovMatrix I s t := min s t`. Prove that these measures satisfy `IsProjectiveMeasureFamily`, which means that they can be extended into a measure over `ℝ≥0 → ℝ` thanks to the Kolmogorov's extension theorem (not in Mathlib yet). The obtained measure is a measure over the set of real processes indexed by `ℝ≥0` and is the law of the Brownian motion. --- - [x] depends on: #36143 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability	226/1	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Moments/Basic.lean	5	4	['EtienneC30', 'github-actions', 'mathlib-dependent-issues', 'sgouezel']	sgouezel assignee:sgouezel	3-62255 3 days ago	63-64464 63 days ago	63-64458 63 days
38205	jcommelin author:jcommelin	chore: reduce technical debt in FreimanHom	This PR reduces technical debt related to the `CommRing` instance on `Fin (n + 1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics large-import awaiting-author	65/27	Mathlib/Combinatorics/Additive/FreimanHom.lean	1	10	['Vierkantor', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	3-61429 3 days ago	3-61429 3 days ago	22-7183 22 days
26975	Whysoserioushah author:Whysoserioushah	feat: a norm_num extension for complex numbers	co-authored-by : @thefundamentaltheor3m, @hrmacbeth --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	424/12	Mathlib.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/NormNumI.lean,Mathlib/Tactic/NormNum/Result.lean,MathlibTest/norm_numI.lean	7	58	['JovanGerb', 'Vierkantor', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	3-60593 3 days ago	75-52046 75 days ago	112-23769 112 days
39411	JovanGerb author:JovanGerb	feat(Push): allow pushing `∀` through `∃`	This PR adds `Classical.skolem` to the `push` set. This allows pusing a forall through an exists, which can sometimes be convenient. This PR also removes `forall_self_imp` from the `push` set. I'm not sure why I added it in the first place - I think it is out of scope. This PR also fixes a subtle bug in `push` which causes `push` to not be idempotent. Namely that the default value of `post` returns `.done` instead of `.continue`, causing the tactic to stop earlier than it should/ --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	9/3	Mathlib/Tactic/Push.lean,MathlibTest/push.lean	2	1	['github-actions']	nobody	3-60352 3 days ago	3-57200 3 days ago	0-3231 53 minutes
38968	eric-wieser author:eric-wieser	fix: improve defeqs of comp actions	The (deliberately) non-reducible `SMul.comp.smul` definition caused us to end with these failing unification examples at instance reducibility: ```lean example : (Module.compHom ℕ (RingHom.id ℕ)).toSMul = SMul.comp ℕ (RingHom.id ℕ) := by with_reducible_and_instances rfl example : (Module.compHom ℕ (RingHom.id ℕ)).toMulAction = MulAction.compHom ℕ (MonoidHom.id ℕ) := by with_reducible_and_instances rfl ``` There are two issues this fixes: * the `compHom` constructors are inconsistent on whether they use `SMul.comp.smul` or reimplement its contents * we need `SMul.comp.smul` to be instance-reducible, so that when invoked with the identity function it is instance-defeq to the original action. As a bonus, allowing these to unify means we can have a single `SMul.comp_smul_def` lemma that works for all of the `compHom` definitions. We could also consider changing `compHom` to take a `HomClass` in order to remove the casts entirely, which would remove the need to add these `SMul.comp` terms. This PR leaves that for possible future work, noting that in the past we have moved away from writing `def`s taking `HomClass`es. Co-authored-by: Junye Ji --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Refined from #38777	t-algebra delegated label:t-algebra$	35/19	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/Module/RingHom.lean	5	5	['JJYYY-JJY', 'Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	3-60038 3 days ago	3-60038 3 days ago	8-53809 8 days
38990	Vierkantor author:Vierkantor	chore(Algebra/DirectSum): workaround for `backward.inferInstanceAs`	This PR works around a `backward.inferInstanceAs` compatibility flag introduced by identifying `DirectSum` with `DFinsupp` in our definitions. We introduce a new dsimp lemma `funLike_eq` that transfers the `FunLike` instances, and now we can use `DirectSum`'s `FunLike` instance, instead of the custom `CoeFun` instance. I unsqueezed a few `simp`s, which all ran pretty much instant on my machine so it shouldn't cause much slowdown. Also we fix two porting notes. This is not a great approach, but it seems the least painful for the short term. The alternative would be to strictly enforce the defeq barrier between `DirectSum` and `DFinsupp`, which would mean a substantial rewrite of this corner of Mathlib. We can't make `DirectSum` an `@[implicit_reducible]`, because we need different multiplication on it than `DFinsupp` has. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt t-ring-theory awaiting-author label:t-algebra$	36/38	Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	9	3	['JovanGerb', 'Vierkantor', 'github-actions']	JovanGerb assignee:JovanGerb	3-59619 3 days ago	4-51028 4 days ago	8-19465 8 days
39406	roos-j author:roos-j	feat(Analysis): van der Corput's lemma	Adds van der Corput's lemma on one-dimensional oscillatory integrals, a standard tool in harmonic analysis. Co-authored-by: Manasa Praveen --- From https://github.com/roos-j/lean-oscillatory, see there for future plans Zulip discussion [#mathlib4 > Oscillatory integrals in Lean](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Oscillatory.20integrals.20in.20Lean/with/584786060) AI disclosure: The code in this PR was predominantly human-written. gpt-5.5 has helped in the later stages with shortening proofs, golfing and general advice.	t-analysis new-contributor	551/0	Mathlib.lean,Mathlib/Analysis/OscillatoryIntegrals/VanDerCorput.lean	2	2	['github-actions']	nobody	3-57649 3 days ago	3-76180 3 days ago	3-77237 3 days
22925	ggranberry author:ggranberry	feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor will-close-soon awaiting-author help-wanted t-analysis	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	16	['AntoineChambert-Loir', 'faenuccio', 'ggranberry', 'github-actions', 'vihdzp']	faenuccio assignee:faenuccio	3-56543 3 days ago	427-48052 427 days ago	3-8649 3 days
37755	YaelDillies author:YaelDillies	refactor(Data/Finsupp): use `single` in `uniqueEquiv`	In essence, this changes `(Finsupp.uniqueEquiv i).symm m` from having support `univ.filter (fun _ ↦ m ≠ 0)` to having support `if m = 0 then {i} else ∅`. These are equal, but having the RHS be `single 1 r` is much more useful in practice. Similarly for `MonoidAlgebra`. To avoid simp getting stuck after rewriting with `uniqueEquiv_symm_apply`, add `uniqueEquiv_symm_apply_apply` and tag it with `simp↓ high`. Also rename `Equiv.finsuppUnique` to `Finsupp.uniqueEquiv` and change the `Unique ι` argument into `Subsingleton ι` and `i : ι`. Similarly for `AddEquiv` and `LinearEquiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	110/70	Mathlib/Algebra/FreeAlgebra/Cardinality.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RingTheory/PicardGroup.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/TensorProduct/Free.lean	18	18	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions']	Vierkantor assignee:Vierkantor	3-55349 3 days ago	3-55422 3 days ago	12-18041 12 days
37534	EtienneC30 author:EtienneC30	feat: cardinality of subsets of a given cardinality	Given a finite set `s`, the number of subsets of `s` with cardinality `n` is `s.ncard.choose n`. This is analog to [Finset.card_powersetCard](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Finset/Powerset.html#Finset.card_powersetCard) and [Set.powersetCard.card](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Set/PowersetCard.html#Set.powersetCard.card) but with a set of sets rather than involving finsets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	22/0	Mathlib/Data/Set/Card.lean	1	3	['EtienneC30', 'github-actions', 'joneugster']	joneugster assignee:joneugster	3-53576 3 days ago	3-53649 3 days ago	45-56792 45 days
39416	AlexBrodbelt author:AlexBrodbelt	feat(Mathlib/Tactic/Group): Improved the group tactic	The `group` tactic is improved to: 1. Once simplification on the exponents is done, apply left and right cancellation. That is, to normalise expressions like `a * b = a * c` to `b * c` 2. Apply a post-processing where expression of the form `( · )^(-1)` are normalised to use the inversion notation `( · )⁻¹`. This allows immediately being able to use lemmas involving inversion which is how most lemmas are stated. There is another PR which adds some relevant tests. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta new-contributor	71/5	Mathlib/Tactic/Group.lean,MathlibTest/Group.lean	2	1	['github-actions']	nobody	3-53088 3 days ago	3-53221 3 days ago	0-51 51 seconds
34088	kbuzzard author:kbuzzard	perf(RingTheory/Kaehler/Polynomial): change universe name for speed-up	Changing the choice of `R`'s universe to `v` from `u` in this file means that alphabetically it's after `u_1` which is a workaround for the issue described here https://github.com/leanprover/lean4/issues/12102 . The bottom line is that Lean's defeq algorithm is now able to typecheck the `left_inv` and `right_inv` proofs in `KaehlerDifferential.mvPolynomialEquiv` over 200 times more quickly (for example `right_inv` goes from 54494621 heartbeats to 222096, i.e. from about 5 seconds to about 0.02 seconds on a typical machine). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Before this PR, Lean was spending far too long in the proof fields of `KaehlerDifferential.mvPolynomialEquiv`, checking defeq on the following kinds of terms (with `pp.all` on): ``` [isDefEq] [815425.000000] ✅️ @Module.{max u u_1, max u_1 u} (@MvPolynomial.{u_1, u} σ R (@CommRing.toCommSemiring.{u} R inst✝)) (@KaehlerDifferential.{u, max u_1 u} R [20 lines omitted] =?= @Module.{max u u_1, max u u_1} (@MvPolynomial.{u_1, u} σ R (@CommRing.toCommSemiring.{u} R inst✝)) (@KaehlerDifferential.{u, max u u_1} R [pretty much the same 20 lines omitted except with max u_1 u replaced by max u u_1 sometimes] ``` with the crucial difference that the second universes in the terms are `max u_1 u` for the first and `max u u_1` for the second. The proofs were taking a few seconds to compile, and then after compilation the kernel was also taking a few seconds to typecheck them. The alphabetical hack in this PR stops this happening and Lean's defeq algorithm now terminates essentially instantly on these terms. Zulip thread: [#mathlib4 > KaehlerDifferential.mvPolynomialEquiv typechecking @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/KaehlerDifferential.2EmvPolynomialEquiv.20typechecking/near/568614162)	t-ring-theory WIP	5/1	Mathlib/RingTheory/Kaehler/Polynomial.lean	1	43	['Vierkantor', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-radar', 'mattrobball']	chrisflav assignee:chrisflav	3-52925 3 days ago	100-35059 100 days ago	8-42588 8 days
39178	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Measure/PreVariation`	- refactors `Mathlib/MeasureTheory/Measure/PreVariation` by simplifying `sum_le'` and `sum_le_preVariationFun_of_subset` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	6/20	Mathlib/MeasureTheory/Measure/PreVariation.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52197 3 days ago	7-73941 7 days ago	7-73934 7 days
39177	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic`	- refactors `Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic` by shortening `Measure.ext_of_charFunDual` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	1/6	Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52105 3 days ago	7-73943 7 days ago	7-73936 7 days
39175	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Integral/CircleTransform`	- refactors `Mathlib/MeasureTheory/Integral/CircleTransform` by shortening `circleTransformDeriv_periodic` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	1/6	Mathlib/MeasureTheory/Integral/CircleTransform.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52065 3 days ago	7-73948 7 days ago	7-73941 7 days
39174	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Integral/Asymptotics`	- refactors `Mathlib/MeasureTheory/Integral/Asymptotics` by simplifying `IsBigO.set_integral_isBigO` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	6/12	Mathlib/MeasureTheory/Integral/Asymptotics.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52055 3 days ago	7-73951 7 days ago	7-73944 7 days
39173	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/ConvergenceInDistribution`	- refactors `Mathlib/MeasureTheory/Function/ConvergenceInDistribution` by shortening `TendstoInDistribution.prodMk_of_tendstoInMeasure_const` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	2/18	Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52033 3 days ago	7-73953 7 days ago	7-73946 7 days
39172	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic`	- refactors `Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic` by simplifying `stronglyMeasurable_in_set` and `stronglyMeasurable_of_measurableSpace_le_on` Extracted from #38104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated t-measure-probability	16/42	Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean	1	2	['github-actions', 'yuanyi-350']	nobody	3-52023 3 days ago	7-73955 7 days ago	7-73948 7 days
39415	mariainesdff author:mariainesdff	feat(LinearAlgebra/QuadraticForm): generalize discr	This generalizes `QuadraticMap.discr`, which currently takes `Q : QuadraticMap R (n → R) R` to `QuadraticForm.discr b`, which allows `Q : QuadraticForm R M` where `M` is an `R`-module with a finite `R`-basis `b`. The old versions are preserved since the generalizations are noncomputable, but their names are updated: `QuadraticMap` is replaced by `QuadraticForm` and `QuadraticMap.discr` is renamed to `QuadraticForm.discr'` (continuing with the notation convention [LinearMap.toMatrix'](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/Matrix/ToLin.html#LinearMap.toMatrix') vs [LinearMap.toMatrix](https://leanprover-community.github.io/mathlib4_docs/Mathlib/LinearAlgebra/Matrix/ToLin.html#LinearMap.toMatrix)). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	121/40	Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/QuadraticForm/AlgClosed.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean	5	1	['github-actions']	nobody	3-51316 3 days ago	3-54501 3 days ago	0-1 1 second
38362	vihdzp author:vihdzp	feat: cofinal subset of regular cardinal is isomorphic to it	In set theory, one often identifies a cardinal `c` with its initial ordinal `c.ord`, and said ordinal with the lower set `Iio c.ord`. This is particularly pervasive in the theory of club and stationary subsets, where one often sees the hypothesis "let κ be a regular cardinal" in lieu of the more precise wording: that `κ` is an (infinite) well-order, whose order type equals the initial ordinal of its cardinality. We define a typeclass `IsRegularCardinalOrder` for this assumption. The benefit of using it is that our results won't apply only to `Iio c.ord` for regular `c`, but also to concrete types such as `Nat`, `Cardinal`, or `Ordinal`. As a proof of concept, we define `Order.enum`, a generalization of both `Nat.nth` and `Ordinal.enumOrd`. A future PR will deprecate the latter. --- - [x] depends on: #38363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	127/11	Mathlib.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality/Enum.lean,Mathlib/SetTheory/Cardinal/Cofinality/Ordinal.lean	5	12	['YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	3-49968 3 days ago	3-69469 3 days ago	7-28007 7 days
35685	riccardobrasca author:riccardobrasca	feat: reduce the use of Classical.choice	## Let's avoid the axiom of choice! This PR is an experiment in developing a version of `mathlib` that minimizes uses of the axiom of choice, especially in basic declarations. For example, [Finset.image](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Data/Finset/Image.html#Finset.image) currently depends on the axiom of choice in `mathlib` but not on this branch. You can use this PR branch just like any other `mathlib` PR branch, in particular the cache system should work normally (you may get a warning to run `lake exe cache get` manually though, just do it). However, you may notice that it uses a custom `lean4` toolchain. The reason is that Lean core itself currently contains results that rely on choice (in particular, via uses of `grind`). Indeed, this branch uses a custom Lean toolchain built from our fork, currently [this version](https://github.com/riccardobrasca/lean4/releases/latest). You can inspect the diff vs `master` [here](https://github.com/leanprover/lean4/compare/master...riccardobrasca:lean4:less_choice) (this diff also contains some GitHub workflow changes, which can be ignored). For the same reason, we also use a custom version of `batteries`, found at the branch [`less_choice`](https://github.com/riccardobrasca/batteries/tree/less_choice). You can see the diff [here](https://github.com/leanprover-community/batteries/compare/main...riccardobrasca:batteries:less_choice). ### Does it work? If you want to count how many declarations depend on choice (on this branch or on `master`), you can use the following script, written by [Robin Arnez](https://github.com/Rob23oba) and Paul Lezeau (thanks!). ```lean import Mathlib open Lean structure State where visited : NameMap Bool := {} abbrev M := ReaderT Environment <\| StateM (NameMap Bool) partial def collect (c : Name) : M Bool := do let collectExpr (e : Expr) : M Bool := e.getUsedConstants.anyM collect let s ← get if let some res := s.find? c then return res let env ← read modify fun s => s.insert c false let res ← match env.checked.get.find? c with \| some (ConstantInfo.axiomInfo v) => collectExpr v.type \| some (ConstantInfo.defnInfo v) => collectExpr v.type <\|\|> collectExpr v.value \| some (ConstantInfo.thmInfo v) => collectExpr v.type <\|\|> collectExpr v.value \| some (ConstantInfo.opaqueInfo v) => collectExpr v.type <\|\|> collectExpr v.value \| some (ConstantInfo.quotInfo _) => pure false \| some (ConstantInfo.ctorInfo v) => collectExpr v.type \| some (ConstantInfo.recInfo v) => collectExpr v.type \| some (ConstantInfo.inductInfo v) => collectExpr v.type <\|\|> v.ctors.anyM collect \| none => pure false modify fun s => s.insert c res return res partial def collectAll : M (Nat × Nat) := do modify fun s => s.insert ``Classical.choice true let env ← read let mut count := 0 let mut total := 0 for (constName, _) in env.constants do total := total + 1 let hasChoice ← collect constName if hasChoice then count := count + 1 return (count, total) run_cmd do let env ← getEnv let (count, total) := collectAll.run env \|>.run' {} let pctTimes10 := if total = 0 then 0 else (count * 1000 + total / 2) / total let pctWhole := pctTimes10 / 10 let pctDecimal := pctTimes10 % 10 Lean.logInfo m!"Found {count} constants depending on Classical.choice out of {total} total ({pctWhole}.{pctDecimal}%)" ``` Currently, we have 383493 declaration that depend on choice, over 722290 in total (53.1%). For comparison, `master` has 391709 use of choice (54.2%). More than eight thousands declarations have become choice free! ### Can I contribute? Yes! If you want to help just open a PR in the usual way (to the forks!). Note that I plan to update core not very often, probably only once a month, when `mathlib` does so. ### How to Remove the Dependency on Choice from a declaration? First of all, note that #print axioms does not work with the new module system. If you want to check whether `X` depends on choice, you should create a new file starting with `import Mathlib` and use `#print axioms foo`. If `X` depends on choice and you want to remove that dependency, there are several steps to consider (for simplicity, we focus on the case where `X` is a theorem): * The first question is mathematical: do you have a choice-free proof? Remember that this means a proof that does not use the law of excluded middle. An important remark is that if the answer is not “yes, this result is trivial”, then it is going to be very hard to do this in `mathlib`. At the moment, it is better to stick to mathematically trivial or very easy declarations. * `mathlib` is very intricate. It is very likely that the proof of `X` consists of just a couple of lines invoking `Y` and `Z`, which are often mathematically almost identical to `X`. In that case, removing choice from `X` amounts to removing choice from `Y` and `Z`. And the same situation may very well arise again for `Y` and `Z`. * In practice, you will quickly find yourself asking: “Where is choice really introduced?” To answer this question, you can use the following script: ```lean import Mathlib open Lean Meta Elab Command namespace ChoiceDeps abbrev DepSet := Std.HashSet Name abbrev ChoiceMemo := NameMap Bool def addExprDeps (deps : DepSet) (e : Expr) : DepSet := Id.run <\| do let mut out := deps for c in e.getUsedConstants do out := out.insert c return out def directDeps (env : Environment) (decl : Name) : DepSet := let deps := match env.checked.get.find? decl with \| some (.axiomInfo v) => addExprDeps {} v.type \| some (.defnInfo v) => addExprDeps (addExprDeps {} v.type) v.value \| some (.thmInfo v) => addExprDeps (addExprDeps {} v.type) v.value \| some (.opaqueInfo v) => addExprDeps (addExprDeps {} v.type) v.value \| some (.quotInfo _) => {} \| some (.ctorInfo v) => addExprDeps {} v.type \| some (.recInfo v) => addExprDeps {} v.type \| some (.inductInfo v) => v.ctors.foldl (init := addExprDeps {} v.type) fun acc c => acc.insert c \| none => {} deps.erase decl partial def transitiveDeps (env : Environment) (root : Name) : DepSet := let rec visit (decl : Name) (visited : DepSet) : DepSet := if visited.contains decl then visited else (directDeps env decl).toArray.foldl (init := visited.insert decl) fun acc dep => visit dep acc (visit root {}).erase root partial def dependsOnChoiceM (env : Environment) (decl : Name) : StateM ChoiceMemo Bool := do let memo ← get if let some b := memo.find? decl then return b modify fun s => s.insert decl false let deps := directDeps env decl if deps.contains ``Classical.choice then modify fun s => s.insert decl true return true let rec go (i : Nat) (arr : Array Name) : StateM ChoiceMemo Bool := do if h : i < arr.size then let d := arr[i] if ← dependsOnChoiceM env d then return true go (i + 1) arr else return false let res ← go 0 deps.toArray modify fun s => s.insert decl res return res def choiceDependencyGraph (env : Environment) (root : Name) : Array Name × NameMap (Array Name) := let work : StateM ChoiceMemo (Array Name × NameMap (Array Name)) := do let mut bfsOrder : Array Name := #[] let mut graph : NameMap (Array Name) := {} let mut queue : Array Name := #[root] let mut qHead := 0 let mut visited : DepSet := {} while qHead < queue.size do let current := queue[qHead]! qHead := qHead + 1 if visited.contains current then continue if !(← dependsOnChoiceM env current) then continue visited := visited.insert current bfsOrder := bfsOrder.push current let allDeps := directDeps env current let mut choiceDeps : Array Name := #[] if allDeps.contains ``Classical.choice then choiceDeps := choiceDeps.push ``Classical.choice for d in allDeps.toArray.qsort Name.quickLt do if d == ``Classical.choice then continue if ← dependsOnChoiceM env d then choiceDeps := choiceDeps.push d if !visited.contains d then queue := queue.push d graph := graph.insert current choiceDeps return (bfsOrder, graph) work.run' {} def formatGraph (bfsOrder : Array Name) (graph : NameMap (Array Name)) : MessageData := let lines := bfsOrder.toList.filterMap fun n => match graph.find? n with \| none => none \| some deps => let depsMsg := MessageData.joinSep (deps.toList.map fun d => m!"{.ofConstName d}") ", " some m!"{.ofConstName n} → {depsMsg}" MessageData.joinSep lines "\n" private def dotNode (n : Name) : String := "\"" ++ n.toString ++ "\"" /-- Produce a Graphviz DOT string for the choice-dependency graph. Paste it at https://dreampuf.github.io/GraphvizOnline -/ def formatDot (root : Name) (bfsOrder : Array Name) (graph : NameMap (Array Name)) : String := let edges : Array String := bfsOrder.foldl (init := #[]) fun acc n => match graph.find? n with \| none => acc \| some deps => deps.foldl (init := acc) fun acc2 d => acc2.push s!" {dotNode n} -> {dotNode d};" let allNodes : Array String := bfsOrder.foldl (init := #[dotNode ``Classical.choice ++ " [shape=diamond, style=filled, fillcolor=tomato]"]) fun acc n => if n == ``Classical.choice then acc else if n == root then acc.push s!"{dotNode n} [style=filled, fillcolor=lightblue]" else acc.push s!"{dotNode n} [style=filled, fillcolor=lightyellow]" let body := ((allNodes.map fun s => " " ++ s) ++ edges).toList "digraph choice_deps {\n rankdir=TB;\n node [fontname=\"Helvetica\", fontsize=10];\n" ++ "\n".intercalate body ++ "\n}" syntax (name := printChoiceDeps) "#print " &"choice_deps_on_choice" ppSpace ident : command syntax (name := printChoiceDepsDot) "#print " &"choice_deps_on_choice_dot" ppSpace ident : command elab_rules : command \| `(#print choice_deps_on_choice $id:ident) => do let targets ← liftCoreM <\| realizeGlobalConstWithInfos id let env ← getEnv for target in targets do let (bfsOrder, graph) := choiceDependencyGraph env target if graph.isEmpty then logInfo m!"{.ofConstName target}: no dependency on Classical.choice" else logInfo m!"{.ofConstName target}:\n{formatGraph bfsOrder graph}" elab_rules : command \| `(#print choice_deps_on_choice_dot $id:ident) => do let targets ← liftCoreM <\| realizeGlobalConstWithInfos id let env ← getEnv for target in targets do let (bfsOrder, graph) := choiceDependencyGraph env target if graph.isEmpty then logInfo m!"{.ofConstName target}: no dependency on Classical.choice" else let dot := formatDot target bfsOrder graph IO.FS.writeFile "graph.dot" dot logInfo m!"DOT graph written to graph.dot\n\n{dot}" end ChoiceDeps /- Example: #print choice_deps_on_choice Finset.univ_eq_empty #print choice_deps_on_choice_dot Finset.univ_eq_empty -- paste output into GraphvizOnline -/ ``` * `#print choice_deps_on_choice_dot X` produces a file (text) `graph.dot`: you can copy/paste the content in [https://dreampuf.github.io/GraphvizOnline/](https://dreampuf.github.io/GraphvizOnline/) the see the dependency graph of declaration used in the proof of `X` that depend on choice. Note that those are ordered from `X` to choice (so the first node is always `X` and the last is always choice). An arrow (to the bottom) from `Y` to `Z` means that `Z` is used in the proof of `Y` and the goal is to change some proof (i.e. modifying the arrows) to disconnect `X` from choice. In the low part of the graph you will usually identify an area of declarations really equivalent to choice (usually everything starting with `Classical.` and everything containing `grind` in the name, plus various other stuff) you should of course treat those as they are choice, it's useless to try to touch this area. It's sometimes not easy to guess where to "attack" the graph, but it's fun, enjoy! --- The github workflow files have been copied from Matthew Ballard's [repository](https://github.com/mattrobball/lean4/tree/eqvModLevels/.github/workflows). We thank Matthew for his work.	merge-conflict	318/88	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/List/Dedup.lean,Mathlib/Data/List/Lattice.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Count.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Interval/Finset/Nat.lean,lake-manifest.json,lakefile.lean,lean-toolchain	24	6	['github-actions', 'mathlib-merge-conflicts', 'mattrobball', 'riccardobrasca']	nobody	3-49768 3 days ago	unknown	0-0 0 seconds
38292	kim-em author:kim-em	feat(AlgebraicTopology): universal cover construction	This PR constructs the universal cover of a path-connected, locally path-connected, semilocally simply connected space `X` as the based-path space modulo endpoint-preserving homotopy, topologised by coinduction from the compact-open based-path space. Split across three files: * `FundamentalGroupoid/BasedPath.lean` — the based-path space and the path-component machinery of `endpoint ⁻¹' U`. * `FundamentalGroupoid/UniversalCover/Basic.lean` — quotient topology, `proj`, and the sheet decomposition. * `FundamentalGroupoid/UniversalCover/Covering.lean` — `isCoveringMap`, `pathConnectedSpace`, `simplyConnectedSpace`, and the universal lifting property `existsUnique_continuousMap_lifts`. - [ ] depends on: #31576 I want to note this takes a different approach than Hatcher et al, which build the universal cover as the path space, but with a "custom" topology. It is then a theorem (often not proved in textbooks) that with the usual hypotheses this topology coincides with the one coinduced from the compact-open topology. I decided that "the mathlib way" was just to start with the "natural" topology, and not take this shortcut. 🤖 Prepared with Claude Code and Codex.	merge-conflict	2997/38	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/BasedPath.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/UniversalCover/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/UniversalCover/Covering.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	11	50	['github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-49522 3 days ago	unknown	0-0 0 seconds
39039	Vierkantor author:Vierkantor	feat(Tactic): congr! and convert now discharge side goals at reducible transparency	This PR changes the `postCongr!` discharge step of the `congr!` and `convert` tactics to operate at reducible transparency by default, just like the `preCongr!` step. This should make the behaviour more predictable since it does not unfold quite as much. `convert_to` and `ac_change` get a similar modification, since they are macros on top of `convert`. To get back the old behaviour and work at default transparency, write `convert!`. To make Mathlib not break due to this change, we replace all occurrences of `convert` with `convert!` in the next commit. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Mathlib.20code.20quality.3A.20simpa/with/594729278 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	2832/2501	Archive/Imo/Imo1982Q3.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2015Q6.lean,Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q2.lean,Archive/Imo/Imo2024Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/Kuratowski.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/MapFloor.lean,Counterexamples/NowhereDifferentiable.lean,Counterexamples/Phillips.lean,Counterexamples/TopologistsSineCurve.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/CharP/Reduced.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/DirectSum/LinearMap.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Group/Fin/Tuple.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Homology/CommSq.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/LeftResolution/Basic.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/Algebra/Homology/SpectralObject/Basic.lean,Mathlib/Algebra/Lie/Basis.lean,Mathlib/Algebra/Lie/Derivation/Killing.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/IsSimple.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Int.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/Notation/Indicator.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Hom/MonoidWithZero.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/IsMonicOfDegree.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Ring/GeomSum.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/TensorProduct.lean,Mathlib/Algebra/TrivSqZeroExt/Basic.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean	1186	10	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	3-49514 3 days ago	4-56988 4 days ago	0-8336 2 hours
39205	ooovi author:ooovi	feat(Geometry/Convex): Bundled convex set	Add a bundled version of `IsConvexSet`. --- Once the dependencies are merged, this PR only changes `Mathlib.Geometry.Convex.Set` and `Mathlib.Geometry.Convex.Hull`, at the bottom of the file, adding `ConvexSet` and everything in the corresponding namespace. - [ ] depends on: #38934 - [ ] depends on: #38905 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR merge-conflict	989/172	Mathlib.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/AffineSpace.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/Hull.lean,Mathlib/Geometry/Convex/README.md,Mathlib/Geometry/Convex/Set.lean	8	6	['github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-49511 3 days ago	unknown	0-0 0 seconds
38553	Whysoserioushah author:Whysoserioushah	feat(RepresentationTheory/Homological): define Tate cohomology	co-authored-by : class field theory team --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra CFT label:t-algebra$	266/1	Mathlib.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LongExactSequence.lean,Mathlib/RepresentationTheory/Homological/TateCohomology/Basic.lean	4	38	['Multramate', 'Whysoserioushah', 'dagurtomas', 'faenuccio', 'github-actions', 'kbuzzard', 'riccardobrasca']	dagurtomas, faenuccio, mariainesdff assignee:dagurtomas assignee:faenuccio assignee:mariainesdff	3-48907 3 days ago	3-48977 3 days ago	20-74732 20 days
38582	dennj author:dennj	feat(LinearAlgebra/Matrix): add Hadamard matrices	Introduce `Matrix.IsHadamard` over a general `Ring R`, with the basic theory: - `IsHadamard` and `IsComplexHadamard` predicates (Definitions 2.3.1 and 2.7.1 of de Launey–Flannery, Algebraic Design Theory). - `IsHadamard.det_sq`: the Hadamard determinant identity `(det A)² = n^n`. - `IsHadamard.det_ne_zero`: over an integral domain of characteristic zero. - `IsHadamard.transpose`: `Aᵀ` is Hadamard whenever `A` is (Theorem 2.3.6), proved over `[CommRing R] [IsDomain R] [CharZero R]` via the adjugate. - `IsHadamard.card_eq_sq_of_const_row_sum`: a Hadamard matrix with constant row sum `s` has order `s²` (slightly stronger than Theorem 2.3.7: the constant-column-sum hypothesis is implied by orthogonality). - `IsHadamard.kronecker`: the Sylvester (Kronecker product) construction. - `IsHadamard.four_dvd_card`: order of a Hadamard matrix of order > 2 is divisible by 4. `Matrix.mul_eq_smul_one_symm`: if `M * N = c • 1` and `det M ≠ 0` over an integral domain, then `N * M = c • 1`. Used here for the transpose proof, but generally useful, analogous to how `mul_eq_one_comm` works over stably finite rings, but covers the integral-domain case (e.g. `ℤ`, `ℤ[X]`) where matrix inverses don't exist. ## References Adds the de Launey–Flannery bibliography entry, cited from the new file. Human-made PR with LLM used for proof golfing and documentation	t-algebra new-contributor label:t-algebra$	166/0	Mathlib.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/LinearAlgebra/Matrix/HadamardMatrix.lean,docs/references.bib	5	51	['JJYYY-JJY', 'dennj', 'eric-wieser', 'github-actions', 'themathqueen', 'wwylele']	dagurtomas assignee:dagurtomas	3-47403 3 days ago	6-24093 6 days ago	21-43126 21 days
39417	kbuzzard author:kbuzzard	perf: make `Ring` extend `AddCommGroupWithOne`	`NonAssocRing` already has this pattern. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR was entirely AI-generated but I have read it and am happy with both of the changed lines.	WIP t-algebra label:t-algebra$	2/2	Mathlib/Algebra/Ring/Defs.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean	2	4	['github-actions', 'kbuzzard', 'leanprover-radar', 'plp127']	nobody	3-47078 3 days ago	3-49525 3 days ago	0-78 1 minute
39117	joelriou author:joelriou	feat(CategoryTheory): the right derived functor commutes with the shift	A few lemmas are obtained about precomposing and postcomposing left/right Kan extensions or right/left derived functors with equivalences of categories. By applying these results to the equivalences given by shifts, we construct a family of isomorphisms which shows that the right derived functor commutes with shifts, and by proving certain compatibilities, we obtain a `Functor.CommShift` instance of the right derived functor of a functor which commutes with shifts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory large-import awaiting-author	413/9	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerivedCommShift.lean,Mathlib/CategoryTheory/Functor/KanExtension/AdjunctionPreserves.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Shift/CommShift.lean,Mathlib/CategoryTheory/Shift/Localization.lean	8	10	['dagurtomas', 'github-actions', 'joelriou', 'robin-carlier']	robin-carlier assignee:robin-carlier	3-45975 3 days ago	5-41731 5 days ago	3-2306 3 days
39386	MichaelStollBayreuth author:MichaelStollBayreuth	chore: shake --keep-implied --keep-prefix --fix	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt large-import merge-conflict	113346/9457	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/AddConstMap/Equiv.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Epi.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/IsSimpleRing.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Shrink.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Pi.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/Algebra/StrictPositivity.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Algebra/Subalgebra/IsSimpleOrder.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Matrix.lean,Mathlib/Algebra/Algebra/Subalgebra/MulOpposite.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/Algebra/Subalgebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Algebra/Subalgebra/Rank.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Balance.lean,Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Field.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/BigOperators/Finsupp/Fin.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/BigOperators/Group/Finset/Gaps.lean,Mathlib/Algebra/BigOperators/Group/Finset/Indicator.lean,Mathlib/Algebra/BigOperators/Group/Finset/Interval.lean,Mathlib/Algebra/BigOperators/Group/Finset/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Finset/Pi.lean,Mathlib/Algebra/BigOperators/Group/Finset/Piecewise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Powerset.lean,Mathlib/Algebra/BigOperators/Group/Finset/Preimage.lean,Mathlib/Algebra/BigOperators/Group/Finset/Sigma.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Defs.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Algebra/BigOperators/Module.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/BigOperators/Ring/Nat.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/BigOperators/Sym.lean,Mathlib/Algebra/BigOperators/WithTop.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/AlgCat/Monoidal.lean,Mathlib/Algebra/Category/AlgCat/Symmetric.lean,Mathlib/Algebra/Category/BialgCat/Basic.lean,Mathlib/Algebra/Category/BialgCat/Monoidal.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/CoalgCat/Basic.lean	7976	3	['MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts']	nobody	3-44565 3 days ago	4-38397 4 days ago	0-2 2 seconds
39419	tb65536 author:tb65536	feat(Dynamics/FixedPoints/Support): define the fixed support of a self-map	This PR defines the fixed support of a self-map to be the closure of the complement of the set of fixed points. This notion arises in dynamics. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-dynamics	79/1	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Defs.lean,Mathlib/Dynamics/FixedPoints/Support.lean	4	1	['github-actions']	nobody	3-41279 3 days ago	3-41279 3 days ago	3-41273 3 days
36218	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory): Add exact sequences for Sheaf Cohomology	In this PR, I add the long exact sequence for sheaf cohomology as well as prove that it is functorial. Since sheaf cohomology is defined in terms of `Ext`, this is done using the covariant sequence for `Ext`. --- - [x] depends on: #34742 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	229/1	Mathlib.lean,Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/ExactSequences.lean	4	29	['Brian-Nugent', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	robin-carlier assignee:robin-carlier	3-40947 3 days ago	3-40947 3 days ago	5-66593 5 days
39270	m13683320924-hue author:m13683320924-hue	feat: prove strict group homs are stable under Prod.map	This PR proves that strict group homomorphisms are stable under product maps. It adds an auxiliary lemma showing that the range restriction of a strict group homomorphism is an open quotient map, and uses it to prove that `MonoidHom.prodMap` preserves `Topology.IsStrictMap`. Towards #38421.	t-topology new-contributor	44/0	Mathlib/Topology/Algebra/Group/Basic.lean	1	7	['eric-wieser', 'github-actions', 'm13683320924-hue']	nobody	3-40896 3 days ago	6-30310 6 days ago	0-1401 23 minutes
36501	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/GradedAlgebra/Homogeneous/RingQuot): graded structure on the quotient of a graded ring by a homogeneous ideal	Define the graded structure on the quotient of a graded ring by a homogeneous ideal Co-authored with: @mariainesdff (Possible TODO: - Maybe define the graded structure on the quotient of a graded module by a homogeneous submodule. - There is also an issue of working with ring congruences rather than with ideals. ) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	545/19	Mathlib.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/Data/DFinsupp/BigOperators.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Span.lean	10	132	['AntoineChambert-Loir', 'chrisflav', 'eric-wieser', 'github-actions', 'robin-carlier']	eric-wieser and robin-carlier assignee:eric-wieser assignee:robin-carlier	3-38990 3 days ago	4-28964 4 days ago	43-30935 43 days
39425	Hagb author:Hagb	chore(Order/Preorder/Finite): use `to_dual`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/25	Mathlib/Order/Preorder/Finite.lean	1	1	['github-actions']	nobody	3-37686 3 days ago	3-37766 3 days ago	3-37759 3 days
39315	marcelolynch author:marcelolynch	chore: bulk strip @[expose] from public sections	Removed `@[expose]` from `section` headers, flipping each file's default from bodies-exposed to bodies-hidden. This was done with a naive automated process that tried removing the annotation + rebuilding each module, then a global build reverting any failures. A second pass used the compiler hints to reapply @[expose] only to certain definitions within the section. Most high-density `@[expose] section` files were filtered out; smarter automation might still give us some mechanically hideable defs (namely, without any proof changes) inside particular sections that could still be exposed.	awaiting-author	279/239	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Azumaya/Defs.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/FGModuleCat/Colimits.lean,Mathlib/Algebra/Category/FGModuleCat/EssentiallySmall.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/Abelian.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/IsFinite.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Algebra.lean,Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Products.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/Algebra/Category/ModuleCat/Tannaka.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/Algebra/Category/Ring/Under/Property.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Expr.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Homology/BifunctorFlip.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/HomologicalComplexBiprod.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/ModelCategory/Lifting.lean,Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/Algebra/Homology/SpectralObject/FirstPage.lean,Mathlib/Algebra/Homology/Square.lean,Mathlib/Algebra/Homology/TotalComplexSymmetry.lean,Mathlib/Algebra/Lie/Graded.lean,Mathlib/Algebra/Lie/SerreConstruction.lean,Mathlib/Algebra/Module/Presentation/RestrictScalars.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Action/End.lean,Mathlib/Algebra/Order/Group/End.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/Quantale.lean,Mathlib/Algebra/Polynomial/Basis.lean,Mathlib/Algebra/Polynomial/Module/TensorProduct.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/SumIteratedDerivative.lean,Mathlib/Algebra/Ring/Pointwise/Finset.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Over.lean,Mathlib/Analysis/Calculus/Gradient/Basic.lean,Mathlib/Analysis/Polynomial/Norm.lean,Mathlib/CategoryTheory/Abelian/EpiWithInjectiveKernel.lean,Mathlib/CategoryTheory/Abelian/Preradical/Radical.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Comma/Presheaf/Colimit.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Enriched/EnrichedCat.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/FiberedCategory/Cocartesian.lean,Mathlib/CategoryTheory/FiberedCategory/Fibered.lean,Mathlib/CategoryTheory/Filtered/Small.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseLeftDerived.lean,Mathlib/CategoryTheory/Functor/Functorial.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Limits.lean,Mathlib/CategoryTheory/Generator/HomologicalComplex.lean,Mathlib/CategoryTheory/GradedObject/Braiding.lean,Mathlib/CategoryTheory/Join/Final.lean,Mathlib/CategoryTheory/Limits/FinallySmall.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Indization/LocallySmall.lean,Mathlib/CategoryTheory/Limits/Indization/ParallelPair.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Limits/Preserves/BifunctorCokernel.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Preserves/Yoneda.lean	237	15	['b-mehta', 'downstream-reports-automation', 'github-actions', 'grunweg', 'jcommelin', 'leanprover-radar', 'marcelolynch']	nobody	3-37579 3 days ago	5-9573 5 days ago	0-22373 6 hours
39428	harahu author:harahu	chore: add an empty line after module headers	This makes the docs easier to read. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		122/4	Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/PeanoCurve.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/EuclideanDomain/Int.lean,Mathlib/Algebra/Homology/Opposite.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Archimedean/IndicatorCard.lean,Mathlib/Algebra/Squarefree/Basic.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/Analysis/Analytic/RadiusLiminf.lean,Mathlib/Analysis/Normed/Affine/Convex.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/CategoryTheory/DinatTrans.lean,Mathlib/CategoryTheory/Limits/Preserves/Filtered.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/CategoryTheory/Preadditive/Schur.lean,Mathlib/CategoryTheory/Sites/Abelian.lean,Mathlib/CategoryTheory/Sites/LeftExact.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Bundle.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/SProd.lean,Mathlib/Data/Set/Enumerate.lean,Mathlib/Data/Set/UnionLift.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/LinearAlgebra/Multilinear/Curry.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/RootSystem/OfBilinear.lean,Mathlib/LinearAlgebra/RootSystem/RootPairingCat.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/Logic/Lemmas.lean,Mathlib/MeasureTheory/Function/EssSup.lean,Mathlib/MeasureTheory/Group/Prod.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbsoluteValue.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/FLT/Four.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/PID.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Three.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/NumberField/EquivReindex.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/Order/Bounded.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/RepresentationTheory/Rep/Res.lean,Mathlib/RingTheory/AdicCompletion/RingHom.lean,Mathlib/RingTheory/Conductor.lean,Mathlib/RingTheory/Coprime/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean	122	1	['github-actions']	nobody	3-36971 3 days ago	3-37051 3 days ago	3-37044 3 days
38899	thorimur author:thorimur	feat: `#scope`	This PR is the first step in creating a toolset of (transient) utilities for assisting with moving declaration commands between files (including sorting out their dependencies, and integrating their needs into the new location). Capturing the current scope necessary for the command is the first task, and to that end this PR contributes the command `#scope`, which reifies the current scope into portable syntax. `#scope` by itself produces a try-this suggestion placing a scope specification after `#scope`, of the following form: ``` #scope (@[expose])? (public)? (noncomputable)? (section)? scope (universe ...)? (namespace ...)? (open @id₁ @id₂ ...)? (open scoped @id₁ @id₂ ...)? (set_options key₁ val₁, key₂ val₂ ...)? (variable ...)? (include ...)? (omit ...)? ``` This is intended to fully capture the "semantic" aspects of the current scope, but not the full scope stack (and so e.g. disregards `section`s). Likewise this slightly-unusual syntax (e.g. `open @Foo` instead of `open Foo`) is intended to act as a portable record of the open declaration which can be acted on by automation, and to discourage interpretation as a "normal" `open` statement. By itself, this is only a slightly odd `#where`. Future PRs (e.g. #38900) will build on this in order to provide a suite of tools for transporting scopes between files and managing them once there, making it easier to move declarations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	513/3	Mathlib.lean,Mathlib/Lean/Elab/Options.lean,Mathlib/Lean/Name.lean,Mathlib/Util/Scope.lean,MathlibTest/Scope.lean	5	12	['JovanGerb', 'Vierkantor', 'github-actions', 'thorimur']	JovanGerb assignee:JovanGerb	3-36734 3 days ago	5-42386 5 days ago	9-32375 9 days
39429	lecopivo author:lecopivo	feat: IsOfAsymptoticClassAt measure asymptotic behavior of functions	The idea behind `IsOfAsymptoticClassAt` is to measure asymptotic behavior of a function which we can be used to reason about integrability of a function. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	346/0	Mathlib/Analysis/Asymptotics/AsymptoticClass.lean	1	2	['github-actions', 'mathlib-bors']	nobody	3-36556 3 days ago	3-36631 3 days ago	0-8 8 seconds
38900	thorimur author:thorimur	feat: `#scope!`	This PR extends `#scope ` to `#scope! `, which resets the current scope to match the scope specification. This is intended to enable a user to flip back and forth between having the scope specification, which may have been created in a separate scope and separate file, inactive (`#scope`) and active (`#scope!`), to observe the effects on subsequent commands and declarations. --- - [ ] depends on: #38899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR	773/3	Mathlib.lean,Mathlib/Lean/Elab/Options.lean,Mathlib/Lean/Name.lean,Mathlib/Util/Scope.lean,MathlibTest/Scope.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	3-36322 3 days ago	unknown	0-0 0 seconds
39339	marcelolynch author:marcelolynch	ci: add !downstream-check PR-validation workflow	Adds a comment-triggered workflow that lets maintainers validate a mathlib4 PR against curated downstream Lean projects. A user comments !downstream-check FLT, Toric --merge-branch, carleson@v1.2.3 on a PR and the workflow: * gates the commenter on `author_association ∈ {OWNER, MEMBER, COLLABORATOR}` * calls `scripts/pr_check_downstream/validate_names.sh` from mathlib-ci to parse the grammar + resolve the PR's merge ref * mints an App token and dispatches the heavy build workflow `mathlib-pr-validation.yml` in `leanprover-community/downstream-reports`, * posts an ack comment on the PR Grammar (each comma-separated entry): [@] [--merge-branch] * `` — inventory short name (e.g. `FLT`) or GitHub `owner/repo` slug. Resolved by the dispatched workflow. * `@` — optional. Any git refspec for the downstream's checkout. * `--merge-branch` — optional, per entry. Flips that entry from the default LKG mode (cherry-pick PR onto the downstream's last-known- good mathlib) to merge mode (build against the PR's merge tree). The dispatched workflow does the actual `git clone` / `lake build` work on `leanprover-community/downstream-reports`'s self-hosted runner pool (no CI secrets in scope), and posts one consolidated result comment back to the PR. Companion changes: * leanprover-community/mathlib-ci#37 — the `validate_names.sh` and `post_ack_comment.sh` scripts this workflow invokes (separate PR).	CI	168/0	.github/workflows/pr_check_downstream.yml	1	1	['github-actions']	bryangingechen assignee:bryangingechen	3-34526 3 days ago	unknown	0-0 0 seconds
34713	dennj author:dennj	feat(Probability/Markov): stationary distributions for stochastic matrices	This PR proves that every row-stochastic matrix on a finite nonempty state space has a stationary distribution in the standard simplex. Main additions to `Mathlib/Probability/Markov/Stationary.lean`: - `IsStationary`: A distribution μ is stationary for matrix P if μ ᵥ* P = μ - `cesaroAverage`: Cesàro average of iterates of a vector under a matrix - `Matrix.rowStochastic.exists_stationary_distribution`: existence theorem The proof uses Cesàro averaging: start with uniform distribution, form averages, extract convergent subsequence by compactness, show limit is stationary via L¹ non-expansiveness. Also adds `vecMul_mem_stdSimplex` to `Stochastic.lean`: multiplying a probability vector by a row-stochastic matrix preserves simplex membership. This is human-made PR with AI help in golfing proof and documenting the code.	new-contributor t-measure-probability	166/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/Probability/Markov/Stationary.lean	3	17	['EtienneC30', 'dennj', 'dupuisf', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'riccardobrasca']	nobody	3-34506 3 days ago	22-20588 22 days ago	32-53594 32 days
39432	DavidLedvinka author:DavidLedvinka	feat: HasBoundedENorm		t-analysis	133/0	Mathlib/Analysis/Normed/Group/HasBoundedENorm.lean	1	1	['github-actions']	nobody	3-34096 3 days ago	unknown	0-0 0 seconds
39424	kbuzzard author:kbuzzard	chore(Algebra/Field/Defs): add `Ring K` as direct extends arm of `Field`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (potentially ridiculous Claude idea)	WIP t-algebra label:t-algebra$	4/1	Mathlib/Algebra/Field/Defs.lean	1	8	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	3-32056 3 days ago	3-38522 3 days ago	0-8 8 seconds
37245	DavidLedvinka author:DavidLedvinka	feat(MeasureTheory): add Resolvent (Stieltjes/Cauchy) Transform	This PR adds the definition of the `resolventTransform` of a measure and some API. This is a non-standard notion that generalizes both the Stieltjes Transform and Cauchy Transform of a (real-valued) measure so that (for example) the proof that these transforms define holomorphic functions off the support of the measure can be given for both at once. Perhaps these important special cases could be made into abbrevs? - [ ] depends on: #37172	t-measure-probability	195/0	Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/MeasureTheory/Measure/ResolventTransform.lean,Mathlib/MeasureTheory/Measure/Support.lean	5	17	['DavidLedvinka', 'EtienneC30', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	EtienneC30 assignee:EtienneC30	3-28832 3 days ago	3-28832 3 days ago	28-80988 28 days
37189	Brian-Nugent author:Brian-Nugent	feat(AlgebraicGeometry): The pushforward of a quasi-coherent sheaf between affines is quasi-coherent	To be more precise, we show that if `AlgebraicGeometry.Scheme.Modules.fromTildeΓ` is an isomorphism then the same holds for the pushforward. This will show that being quasicoherent is stable under pushforward for affine morphisms once it is shown that `AlgebraicGeometry.Scheme.Modules.fromTildeΓ` being an isomorphism is equivalent to being quasicoherent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	215/5	Mathlib/Algebra/Category/ModuleCat/Localization.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean	6	38	['Brian-Nugent', 'chrisflav', 'github-actions', 'joelriou']	adamtopaz and chrisflav assignee:adamtopaz assignee:chrisflav	3-27043 3 days ago	3-27043 3 days ago	32-50771 32 days
33313	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Coloring/Edge): create a basic edge-coloring API	Module name decided on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500). --- Future work (which I'm working on): - Relating degrees to edge-colorability (`G.maxDegree ≤ G.chromaticIndex`, `G.EdgeColorable 1 ↔ G.maxDegree ≤ 1`, `G.chromaticIndex = 1 ↔ G.maxDegree = 1`, `G.EdgeColorable 2 ↔ G.maxDegree ≤ 2`, `G.chromaticIndex = 2 ↔ G.maxDegree = 2`) - [Vizing's theorem](https://en.wikipedia.org/wiki/Vizing%27s_theorem) (`G.chromaticIndex ≤ G.maxDegree + 1`) - `chromaticIndex ⊤ = (if Even #V then #V - 1 else #V)` - `[Infinite α] → chromaticIndex ⊤ = ⊤` - [x] depends on: #33292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	300/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Edge.lean	2	28	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'ooovi']	YaelDillies assignee:YaelDillies	3-27015 3 days ago	18-42593 18 days ago	55-83920 55 days
39227	SnirBroshi author:SnirBroshi	feat(GroupTheory/Commutator/Basic): `⁅H₁, H₂⁆` is a normal subgroup of `H₁ ⊔ H₂`	Shows `⁅H₁, H₂⁆ ≤ H₁ ⊔ H₂` and `(⁅H₁, H₂⁆.subgroupOf <\| H₁ ⊔ H₂).Normal`, and adds `_ ≤ normalizer _ ↔` lemmas to help. --- (from the book "Finite Groups" by Daniel Gorenstein) Also renames `AddSubgroup.mem_normalizer_iff_conj_image_eq` because `to_additive` now renames `conj` to `addConj` and this theorem should stay in sync with its counterpart, even though it's not using `to_additive` because `MulAut` isn't additivized. The proofs seem pretty long for such trivial lemmas, suggestions welcome :) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	85/6	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/Commutator/Basic.lean	2	6	['SnirBroshi', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	3-23607 3 days ago	3-58226 3 days ago	6-52262 6 days
39442	justus-springer author:justus-springer	feat(AlgebraicGeometry/Restrict): a few more restriction lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	55/0	Mathlib/AlgebraicGeometry/Restrict.lean	1	1	['github-actions']	nobody	3-22434 3 days ago	3-22534 3 days ago	3-22527 3 days
39328	justus-springer author:justus-springer	chore(AlgebraicGeometry): add deprecated module for `RationalMap`	Follow-up to #39316 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry easy	11/0	Mathlib.lean,Mathlib/AlgebraicGeometry/RationalMap.lean	2	1	['github-actions']	nobody	3-21062 3 days ago	5-28979 5 days ago	5-28972 5 days
39445	justus-springer author:justus-springer	feat(AlgebraicGeometry/Birational): composition of rational maps	Define composition of partial and rational maps. - [ ] depends on: #39442 - [ ] depends on: #39443 - [ ] depends on: #39317 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry blocked-by-other-PR	443/13	Mathlib.lean,Mathlib/AlgebraicGeometry/Birational/Composition.lean,Mathlib/AlgebraicGeometry/Birational/Dominant.lean,Mathlib/AlgebraicGeometry/Birational/RationalMap.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/Data/Set/Image.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	3-20562 3 days ago	3-20563 3 days ago	0-1227 20 minutes
35394	HugLycan author:HugLycan	feat(Tactic/Positivity): make positivity work for types that are not partial orders	Make positivity work for types that are not partial orders Most PositivityExt haven't been updated for non partial order cases yet. They will be updated in the later PR. `Strictness` now depends on `Option Q(PartialOrder $α)` instead of `Q(PartialOrder $α)`, and the constructors `Strictness.positive`/`Strictness.nonnegative` now have their `Q(PartialOrder $α)` typeclass arguments. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta maintainer-merge	612/354	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Order.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/DerivHyp.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Factorial/DoubleFactorial.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean,Mathlib/NumberTheory/ArithmeticFunction/Zeta.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/NumberTheory/Height/NumberField.lean,Mathlib/NumberTheory/Height/Projectivization.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,MathlibTest/positivity.lean	54	90	['HugLycan', 'JovanGerb', 'fpvandoorn', 'github-actions', 'joneugster', 'leanprover-radar', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	3-19689 3 days ago	7-19833 7 days ago	54-52832 54 days
39450	FLDutchmann author:FLDutchmann	feat(Asymptotics): define (d)elaborator for asymptotic notation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	747/0	Mathlib/Tactic/Asymptotics/Basic.lean	1	2	['github-actions', 'mathlib-bors']	nobody	3-17467 3 days ago	3-17525 3 days ago	0-16 16 seconds
39325	mcdoll author:mcdoll	feat(FunProp): tag integrableOn	Add tags so that `fun_prop` can prove `IntegrableOn` Done at ICERM workshop "Techniques and Tools for the Formalization of Analysis" --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	108/12	Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,MathlibTest/FunProp.lean	3	4	['fpvandoorn', 'github-actions']	nobody	3-17299 3 days ago	3-32365 3 days ago	0-1567 26 minutes
38055	felixpernegger author:felixpernegger	feat(Topology/EMetricSpace): add r-variation	Redoing #37007 (I had accidently deleted my fork which nuked the PR). See https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/p-variation for discussion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-analysis	408/0	Mathlib.lean,Mathlib/Topology/EMetricSpace/RVariation.lean	2	2	['felixpernegger', 'github-actions']	nobody	3-13671 3 days ago	32-70648 32 days ago	32-71035 32 days
39101	ldct author:ldct	feat: Tag exp_nat_mul and exp_int_mul	Tag these two lemmas to allow - pushing the `^` in `(exp ...)^...` - pushing the `exp` in `exp (... * ...)` and add unit tests. Also tag the real versions, and `exp 0` for `push exp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	28/2	Mathlib/Analysis/Complex/Exponential.lean,MathlibTest/push.lean	2	5	['github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	3-13489 3 days ago	3-13490 3 days ago	6-85937 6 days
37374	NoneMore author:NoneMore	feat(Topology/DerivedSet): add relative derived set lemmas	Add `relDerivedSet`, `relDerivedSet_subset`, and `IsClosed.relDerivedSet_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	17/0	Mathlib/Topology/DerivedSet.lean	1	6	['NoneMore', 'github-actions', 'plp127', 'vihdzp']	dagurtomas assignee:dagurtomas	3-12841 3 days ago	48-48118 48 days ago	49-15125 49 days
37522	matthewjasper author:matthewjasper	chore: adjust Module.Finite instance priority	Make instances that are rarely going to be helpful lower priority. Increase the priority of `FiniteDimensional.complexToReal`, because it's more likely correct than the other priority 100 `Module.Finite` instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	6/4	Mathlib/LinearAlgebra/Complex/FiniteDimensional.lean,Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean	3	3	['github-actions', 'grunweg', 'leanprover-radar']	joelriou assignee:joelriou	3-12840 3 days ago	47-26747 47 days ago	47-26740 47 days
38097	NoahW314 author:NoahW314	feat: add `IndiscreteTopology` instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Separation/Connected.lean	4	5	['NoahW314', 'github-actions', 'scholzhannah', 'vihdzp']	urkud assignee:urkud	3-12837 3 days ago	32-56546 32 days ago	32-75578 32 days
38214	emlis42 author:emlis42	feat(Algebra/ContinuedFractions): add Euler's continued fraction	This PR formalizes Euler’s continued fractions by providing `Euler` which construct one by giving head term and coefficients with some basic property. We also introduce a transformation `GenContFract.toEuler` that maps a generalized continued fraction `g : GenContFract K` to an equivalent Euler-form continued fraction.	new-contributor t-algebra label:t-algebra$	262/0	Mathlib.lean,Mathlib/Algebra/ContinuedFractions/Euler.lean	2	15	['github-actions', 'mathlib-bors', 'wwylele']	dagurtomas assignee:dagurtomas	3-12836 3 days ago	25-40185 25 days ago	25-43930 25 days
38731	martinwintermath author:martinwintermath	feat(LinearAlgebra/AffineSpace/AffineSubspace): using `AffineSubspace.direction` to reinterpret `AffineSubspace` as `Submodule`	* add `AffineSubspace.vsub_self_of_zero_mem` that states `s -ᵥ s = s ` if `0 ∈ s` * add `AffineSubspace.direction_eq_self_of_zero_mem` that states that if `0 ∈ s`, then the directions coerce back to the affine subspace. * add corresponding `CanLift` instance. * modify doc-string of `AffineSubspace.direction` to state that this can be used for reinterpretation of an affine subspace as a submodule. * add `Coe` instance based on `Submodule.toAffineSubspace` and adds corresponding @[coe] attribute. The PR also performs a slight cleanup of the file: statements about `SetLike` or `Submodule.toAffineSubspace` have been moved closer to their respective definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	56/26	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	1	3	['github-actions', 'wwylele']	themathqueen assignee:themathqueen	3-12836 3 days ago	19-37587 19 days ago	19-38731 19 days
39143	YaelDillies author:YaelDillies	feat(Analysis): operator norm of a `LinearIsometryEquiv`	Also generalise a bunch of lemmas from `NormedAddCommGroup` + `Nontrivial` to `SeminormedAddCommGroup` + `NontrivialTopology`. From MeanFourier --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	72/48	Mathlib/Analysis/Normed/Operator/NormedSpace.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/Order.lean	3	3	['YaelDillies', 'github-actions', 'themathqueen']	PatrickMassot assignee:PatrickMassot	3-12835 3 days ago	5-83358 5 days ago	5-84550 5 days
39326	mcdoll author:mcdoll	chore(FunProp): additional lemmas for `Integrable`	Done at ICERM workshop "Techniques and Tools for the Formalization of Analysis". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	6/1	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Integral/Prod.lean	4	1	['github-actions']	EtienneC30 assignee:EtienneC30	3-12832 3 days ago	5-30564 5 days ago	5-30557 5 days
39332	Michaillus author:Michaillus	chore(Topology/Spectral): Added two small lemmas	chore(Topology/Spectral): Added two lemmas `IsCompact.isClosed_constructibleTopology_of_isOpen` `IsCompact.isClosed_constructibleTopology_of_isClosed` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	12/0	Mathlib/Topology/Spectral/ConstructibleTopology.lean	1	6	['Michaillus', 'github-actions', 'qawbecrdtey']	PatrickMassot assignee:PatrickMassot	3-12830 3 days ago	5-26193 5 days ago	5-26186 5 days
39350	mcdoll author:mcdoll	feat(Topology): lemmas about `nhdsSet` filter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	50/8	Mathlib/Order/Filter/Tendsto.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/Thickening.lean,Mathlib/Topology/NhdsSet.lean	4	1	['github-actions']	PatrickMassot assignee:PatrickMassot	3-12829 3 days ago	5-3558 5 days ago	5-3551 5 days
39391	emlis42 author:emlis42	feat(MeasureTheory/Integral): add integral_congr_uIoo	This PR adds some congruence lemmas for interval integrals under `NoAtoms μ` and golfs some lemmas. \| Lemma \| Heartbeats \| Proof Elaboration Time \| ---- \| ---- \| ---- `LocallyIntegrable.ae_hasDerivAt_integral` \| 7684 → 5235 (−2449, 31%) \| 603ms → 445ms (−157ms, 26%) `MonotoneOn.exists_tendsto_deriv_liminf_lintegral_enorm_le` \| 31019 → 8388 (−22631, 73%) \| 2475ms → 631ms (−1843ms, 74%) `MonotoneOn.intervalIntegral_deriv_mem_uIcc` \| 22680 → 5983 (−16697, 73%) \| 1713ms → 537ms (−1175ms, 68%) `AbsolutelyContinuousOnInterval.integral_deriv_mul_eq_sub` \| 1475 → 845 (−630, 42%) \| 92ms → 41ms (−50ms, 55%) `fourierCoeff_liftIco_eq` \| 1040 → 703 (−337, 32%) \| 55ms → 41ms (−13ms, 24%) `taylor_integral_remainder_aux` \| 26585 → 18827 (−7758, 29%) \| 2095ms → 1575ms (−520ms, 24%) Profiled on top of commit `9e407aa1ef1be515a1bd0e1c1fc081d5b855f25e` using `set_option trace.profiler true in` and ``` set_option Elab.async false in #count_heartbeats in ```	t-measure-probability new-contributor	52/35	Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsolutelyContinuousFun.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferentiationThm.lean	6	2	['github-actions']	EtienneC30 assignee:EtienneC30	3-12828 3 days ago	4-30835 4 days ago	4-30828 4 days
39436	dtumad author:dtumad	chore: Add `seqLeft` and `seqRight` unfolding to monad_norm simp set	This PR adds `seqLeft_eq_bind` and `seqRight_eq_bind` to `monad_norm`, so that `<` and `>` get unfolded in the same way as `<*>` already does when using the `simp` set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta new-contributor	1/1	Mathlib/Tactic/Attr/Core.lean	1	2	['github-actions']	dwrensha assignee:dwrensha	3-12825 3 days ago	3-26414 3 days ago	3-26407 3 days
39444	FLDutchmann author:FLDutchmann	fix(Tactic/Algebra): properly handle scalars that evaluate to zero	When `algebra` encounters `0 • x` it gets normalized to `0 • x` instead of `0`, breaking the invariant that coefficients are not allowed to be zero. This PR fixes this issue and adds a corresponding test. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta maintainer-merge	18/3	Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,MathlibTest/Algebra.lean	3	5	['FLDutchmann', 'github-actions', 'grunweg']	thorimur assignee:thorimur	3-12823 3 days ago	3-21490 3 days ago	3-21590 3 days
39440	mckoen author:mckoen	feat(AlgebraicTopology/Quasicategory): functor quasi-categories	WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP t-category-theory	212/0	Mathlib/AlgebraicTopology/Quasicategory/InternalHom.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean	2	1	['github-actions']	nobody	3-12788 3 days ago	3-23313 3 days ago	0-17 17 seconds
39452	Deicyde author:Deicyde	chore: Move `UnitAddTorus` to Topology/Instances/AddCircle/Real.lean	Previous location of `UnitAddTorus` in Analysis/Fourier/AddCircleMulti.lean was ad-hoc and required users to import the entire Fourier analysis infrastructure just to use the torus. I suggest moving it to it's natural home beside `UnitAddCircle`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	3/3	Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Topology/Instances/AddCircle/Real.lean	2	3	['github-actions']	nobody	3-12364 3 days ago	3-12841 3 days ago	3-12834 3 days
39454	SnirBroshi author:SnirBroshi	feat(Analysis/Convex/Jensen): more forms of Jensen's strict inequality	Adds iff theorems for Jensen's strict inequality for `<`/`=`, positive/nonnegative weights, and canonical form versions. --- Note that as established by existing theorems in the file, "canonical" here refers to comparing terms to the center of mass instead of to each other. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	95/13	Mathlib/Analysis/Convex/Jensen.lean	1	1	['github-actions']	nobody	3-11788 3 days ago	3-11866 3 days ago	3-11859 3 days
39438	SnirBroshi author:SnirBroshi	chore(Order/WellFounded): use `to_dual`	Creates `argmax`/`argmaxOn` duals to the existing `argmin`/`argminOn`, and `WellFoundedLT.min`/`WellFoundedGT.max` in order to properly dualize `WellFounded.min_le`. Some theorems about `WellFounded{LT/GT}` which didn't have a dual before have to be renamed to make room, e.g. `StrictMono.range_inj` is renamed to `StrictMono.range_inj_of_wellFoundedLT`. --- This is blocking dualizing things in `ConditionallyCompleteLattice/Basic.lean`. `WellFounded.min_le` has ~30 usages in ~10 files, so deprecating it should probably happen in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	80/34	Mathlib/Data/Finset/Sort.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/WellFounded.lean,Mathlib/SetTheory/Ordinal/Enum.lean	4	5	['SnirBroshi', 'github-actions', 'vihdzp']	nobody	3-10745 3 days ago	3-10817 3 days ago	3-19406 3 days
39106	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/Reindex): `AddEquiv` and `RingEquiv`	We had `Matrix.reindex` bundled as a `LinearEquiv` and an `AlgEquiv`, and this bundles it as an `AddEquiv` and a `RingEquiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	158/43	Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean	4	10	['SnirBroshi', 'eric-wieser', 'github-actions', 'themathqueen']	nobody	3-10304 3 days ago	6-12991 6 days ago	6-35186 6 days
39456	BMMilligan1 author:BMMilligan1	feat(Probability/PMF): advantageFromHalf for Bool-valued PMFs	This PR adds `PMF.advantageFromHalf : PMF Bool → ℝ`, defined as `2 * (p true).toReal - 1`, together with API lemmas covering bounds (`_le_one`, `_neg_one_le`), the zero-advantage characterization (`_eq_zero_iff_half`), `PMF.map` composition (`_map_tsum`), and canonical witness evaluations on `uniformOfFintype Bool`, `pure true`, and `pure false`. ## Motivation The "advantage from half" of a Bernoulli-like distribution is the signed gap of the `true`-probability away from `1/2`, rescaled to `[-1, 1]`. It is the natural decision-algorithm advantage notion in computational complexity: when a heuristic `H : α → Bool` is post-composed with a `PMF α` via `PMF.map`, the resulting `PMF Bool`'s `advantageFromHalf` is the advantage of `H` as a decision procedure on the source distribution. Concretely, the definition supports formalizations of Hirahara 2018 (FOCS, [arXiv:1808.06974](https://arxiv.org/abs/1808.06974)) Theorem 1.1's worst-case-to-average-case reduction for Gap-MCSP, where the heuristic algorithm's advantage `ε(n) = 1/poly(n)` over the uniform truth-table distribution is the load-bearing quantity. The current Mathlib `PMF` library supports `PMF.uniformOfFintype` (see `Mathlib/Probability/Distributions/Uniform.lean`) but lacks the bias-from-half notion at this signature. ## API summary - `PMF.advantageFromHalf : PMF Bool → ℝ` - `PMF.advantageFromHalf_le_one` (`@[simp]`) - `PMF.advantageFromHalf_neg_one_le` (`@[simp]`) - `PMF.advantageFromHalf_eq_zero_iff_half` - `PMF.advantageFromHalf_map_tsum` - `PMF.advantageFromHalf_uniformBool` (witness: advantage 0) - `PMF.advantageFromHalf_pure_true` (witness: advantage 1) - `PMF.advantageFromHalf_pure_false` (witness: advantage -1) ## Notes * The file lives at `Mathlib/Probability/ProbabilityMassFunction/Advantage.lean`, alphabetically before `Basic.lean`, and is imported in `Mathlib.lean` at the corresponding alphabetical position. * All proofs are sorry-free. * The definition is `noncomputable` (matches `PMF` style; `(p true).toReal` threading through `ENNReal`). * No new imports outside the existing PMF / ENNReal substrate. * Maintainer review of the naming (`advantageFromHalf` vs alternative candidates like `biasFromHalf`) and of whether the `tsum`-form composition lemma should be supplemented by a `Finset.sum` variant for `Fintype` sources is most welcome. Co-authored-by: Claude Opus 4.7 (1M context)	t-measure-probability new-contributor	120/0	Mathlib.lean,Mathlib/Probability/ProbabilityMassFunction/Advantage.lean	2	2	['github-actions']	nobody	3-8852 3 days ago	unknown	0-0 0 seconds
39100	ADedecker author:ADedecker	feat: operators which are strict and with closed range are stable under finite rank perturbation	--- - [x] depends on: #38579 - [ ] depends on: #39260 - [x] depends on: #39344 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	540/16	Mathlib.lean,Mathlib/Analysis/Normed/Operator/Perturbation/StrictByFinite.lean,Mathlib/Topology/Algebra/Module/Complement.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	4	3	['ADedecker', 'github-actions', 'mathlib-dependent-issues']	nobody	3-6114 3 days ago	unknown	0-0 0 seconds
39404	metakunt author:metakunt	feat(NumberTheory/AKSPrimality): Introspective definition	This defines the introspective relation and proves the key property for the AKS theorem. From #34507	t-number-theory awaiting-author	147/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	2	['github-actions', 'tb65536']	tb65536 assignee:tb65536	3-5259 3 days ago	3-5259 3 days ago	0-85415 23 hours
37076	ertwro author:ertwro	feat(Combinatorics/SimpleGraph/Hasse): Hasse diagram is triangle-free	Add `SimpleGraph.hasse_cliqueFree_three`: the Hasse diagram of a preorder is triangle-free (`CliqueFree 3`). This is the graph-theoretic formulation of `not_covBy_of_lt_of_lt`: if `a ⋖ b` and `b ⋖ c`, then `¬ a ⋖ c`, so no three elements can be pairwise adjacent in the Hasse diagram. The proof extracts three vertices from a hypothetical 3-clique, case-splits on the covering directions (8 cases), and closes each by `not_covBy_of_lt_of_lt` (6 transitive cases) or `lt_asymm` (2 cyclic cases). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	11/0	Mathlib/Combinatorics/SimpleGraph/Hasse.lean	1	21	['Rida-Hamadani', 'SnirBroshi', 'ertwro', 'github-actions', 'vlad902']	nobody	2-85139 2 days ago	30-2215 30 days ago	38-11988 38 days
39229	grunweg author:grunweg	dev: towards `fun_prop` on manifolds	--- - [ ] depends on: #39226 Rebased version of #31580. Meant to be a prototype that demonstrate how this could possibly work. Not functional yet; waiting on cache to continue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	305/1	Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Tactic/FunProp/Core.lean,MathlibTest/DifferentialGeometry/FunPropM.lean,MathlibTest/fun_prop_dev.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-83488 2 days ago	7-10660 7 days ago	0-12 12 seconds
37405	Paul-Lez author:Paul-Lez	feat(Mathlib/Algebra/BigOperators/Fin): lemma about List.ofFn	I tried several places for this lemma but wasn't able to find any one that didn't result in a `large-import` issue - suggestions would be welcome! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import awaiting-author label:t-algebra$	7/0	Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean	1	2	['YaelDillies', 'github-actions']	nobody	2-80336 2 days ago	2-80336 2 days ago	4-51272 4 days
37707	MavenRain author:MavenRain	feat(Combinatorics/SimpleGraph): add IsMaximalClique/IsMaximalIndepSet, refactor IsMaximum* to MaximalFor	Addresses #34962	new-contributor t-combinatorics	63/31	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	6	['MavenRain', 'SnirBroshi', 'eric-wieser', 'github-actions']	nobody	2-78462 2 days ago	2-78534 2 days ago	2-80167 2 days
31730	thorimur author:thorimur	feat(Meta): declaration manipulation meta API: allow logging on type signature of theorems	This PR introduces some initial definitions in the space of a declaration manipulation meta API. In the course of #31142, it became apparent that we could benefit from having tools for handling the syntax and elaboration info of user-written declarations. This PR makes a small beginning towards that end in the Mathlib.Util.DeclarationManipulation module, and provides API for - getting the info and syntax ref of a declaration given its `Name` - getting the ref of a theorem's type signature from within some command source syntax given the declaration's ref given above - running a monadic action with the ambient ref set to that of the type signature of a theorem, with sensible fallbacks This is used to improve logging locations for the unused-instances-in-types linters, and may be useful for other linters that want to inpsect a theorem's type at the expression level (instead of the syntax level). (It also introduces the small helper definitions `Syntax.findSome?` and `Syntax.rangeEq`, which behave as expected.) For context: in the future, it would be nice to - provide support for all sorts of declarations, not just theorems--but this requires a lot more syntax matching - provide "exploded views" of declaration syntax like `mkDefView`, but finer grained, and geared for use during linting rather than elaboration - make it easy to compose complex suggestions to transform different parts of a declaration at once --- - [x] depends on: #31725 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	131/0	Mathlib.lean,Mathlib/Lean/Syntax.lean,Mathlib/Util/DeclarationManipulation.lean	3	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-73527 2 days ago	165-3367 165 days ago	2-29773 2 days
38317	WenrongZou author:WenrongZou	feat(Date/Choose): add some lemmas about choose of prime pow	In this PR, I add some lemma about choose of prime pow. 1) For primes `p` and positive integer `n`, assume that for all `i ∈ Icc 1 (n - 1)`, `choose n i` congruent to `0` module `p`, then `n = p ^ multiplicity p n`. 2) For a prime power `n`, the greatest common divisor of `choose n 1, ⋯, choose n (n - 1)` is actually the minimal prime factor of `n`. 3) For a natural number `n` greater than `1`, assume that `n` is not a prime power, then the greatest common divisor of `choose n 1, ⋯, choose n (n - 1)` is `1`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	98/0	Mathlib/Data/Nat/Choose/Lucas.lean	1	5	['WenrongZou', 'github-actions', 'joneugster']	joneugster assignee:joneugster	2-71927 2 days ago	2-71727 2 days ago	28-22408 28 days
38052	WenrongZou author:WenrongZou	feat(FormalGroup): `F(X,0)=X` and `F(0,X)=X`	In this PR, I prove that given a formal group law `F`, then `F(X,0) = X` and `F(0,X) = X`. And modify the definition of `FormalGroup.Point` to be a subtype. And prove that this subtype is a `AddZeroClass`. Eventually we will prove that this is a `AddGroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	255/33	Mathlib/RingTheory/FormalGroup/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Evaluation.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	5	17	['WenrongZou', 'eric-wieser', 'github-actions', 'mariainesdff']	mattrobball assignee:mattrobball	2-71630 2 days ago	16-25970 16 days ago	34-24416 34 days
37056	lecopivo author:lecopivo	feat(Tactic/FunProp): proper support for metavariables in fun_prop goals	This PR add proper support for metavariables in `fun_prop` goals thus allows for properly solving goals like `HasFDerivAt k f ?f' x`. --- This extension to `fun_prop` will enable computation of derivatives by properly handling metavariables in `fun_prop` goal thus allowing us to solve `HasFDerivAt k f ?f' x` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta large-import awaiting-author merge-conflict	1217/220	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/Simproc.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Measurability.lean,MathlibTest/FunPropMinimal.lean,MathlibTest/FunPropMinimalOutParam.lean	12	31	['eric-wieser', 'github-actions', 'lecopivo', 'mathlib-merge-conflicts', 'thorimur']	alexjbest and thorimur assignee:alexjbest assignee:thorimur	2-70491 2 days ago	46-10933 46 days ago	7-45984 7 days
37231	lecopivo author:lecopivo	feat(Tactic/FunProp): set up `fun_prop` for HasFDerivAt	Correctly set up `fun_prop` for `HasFDerivAt` and set up `deriv_simproc` for simplifying `fderiv ...`. - [ ] depends on: #37056 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-meta merge-conflict	1327/228	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean,Mathlib/Analysis/Calculus/FDeriv/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/Simproc.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Measurability.lean,MathlibTest/FunProp.lean,MathlibTest/FunPropMinimal.lean,MathlibTest/FunPropMinimalOutParam.lean	24	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-70490 2 days ago	53-39572 53 days ago	0-432 7 minutes
37270	lecopivo author:lecopivo	feat(Tactic/FunProp): set up fun_prop for HasDerivAt	Correctly set up fun_prop for `HasDerivAt` and set up deriv_simproc for simplifying `deriv ...`. - [ ] depends on: #37231 - [ ] depends on: #37056 --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-meta merge-conflict	1709/252	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/AffineMap.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Comp.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/Deriv/Linear.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/Deriv/Pi.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/Deriv/Prod.lean,Mathlib/Analysis/Calculus/Deriv/Star.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean,Mathlib/Analysis/Calculus/FDeriv/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Prod.lean,Mathlib/Analysis/SpecialFunctions/Arcosh.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogDeriv.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ArctanDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ComplexDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/DerivHyp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/Simproc.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Measurability.lean,MathlibTest/FunProp.lean,MathlibTest/FunPropMinimal.lean,MathlibTest/FunPropMinimalOutParam.lean	46	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-70489 2 days ago	52-60475 52 days ago	0-350 5 minutes
39140	kim-em author:kim-em	feat(scripts): add lake exe no_expose tool for @[expose] removal	This PR adds `lake exe no_expose`, a tool that identifies and removes `@[expose]` attributes on defs that aren't needed downstream. Three subcommands: `collect`, `report`, `edit`. The `collect` subcommand walks the built Mathlib environment via `Lean.withImportModules` to emit per-decl enumeration, static cross-references, and per-decl reference lists. Without `--skip-build` it additionally patches the lakefile to enable `diagnostics=true / diagnostics.threshold=0` and parses the build log for unfold events; backups are restored on cleanup or on startup recovery from an interrupted run. The `edit` subcommand resolves a `@[expose] public section` file by dropping the section-level marker and re-adding `@[expose]` only on needed decls (`auto`/`section`/`individual` strategies; merges into existing attribute lists correctly to avoid stacked `@[...]` blocks). Edits apply by default; `--dry-run` previews. Refuses on uncommitted changes or stale report data unless explicitly overridden; differential parse-validation before writing; `--verify` runs `lake build` on the touched module and rolls back on failure; every change is recorded as a unified diff in `scripts/.no_expose/edits.patch`. 🤖 Prepared with Claude Code	merge-conflict	8185/1240	.github/workflows/build_template.yml,.gitignore,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2024Q6.lean,Cache/Requests.lean,Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Adjunction.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafification.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/MonCat/Yoneda.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Ring/Under/Basic.lean,Mathlib/Algebra/Category/Ring/Under/Limits.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Nat/Even.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/GroupWithZero/Action/Faithful.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/AlternatingConst.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorAssociator.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/CochainComplexOpposite.lean,Mathlib/Algebra/Homology/CochainComplexPlus.lean,Mathlib/Algebra/Homology/CommSq.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExactSequences.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean	1416	1	['urkud']	nobody	2-68831 2 days ago	unknown	0-0 0 seconds
39144	YaelDillies author:YaelDillies	feat(Analysis): more `LinearIsometryEquiv` API	From MeanFourier --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	32/18	Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	4	9	['YaelDillies', 'github-actions', 'leanprover-radar', 'themathqueen', 'urkud']	nobody	2-68227 2 days ago	5-84225 5 days ago	5-86047 5 days
38340	xroblot author:xroblot	refactor(Data/ZMod): move `coe_int_isUnit_iff_isCoprime` to `ZMod.Units`	Move `ZMod.coe_int_isUnit_iff_isCoprime` from `Mathlib.Data.ZMod.Coprime` to `Mathlib.Data.ZMod.Units`, where it more naturally belongs as a statement about units in `ZMod`. The proof is rewritten to only use tools available in `Mathlib.Data.ZMod.Units`, avoiding the dependency on `Mathlib.Algebra.EuclideanDomain.Int`. This is motivated by the desire to use `coe_int_isUnit_iff_isCoprime` without the overhead of importing `Mathlib.Data.ZMod.Coprime` (see #38339 for a use case). 🤖 Co-Authored with [Claude Code](https://claude.com/claude-code)	t-data	10/7	Mathlib/Data/ZMod/Coprime.lean,Mathlib/Data/ZMod/Units.lean	2	3	['github-actions', 'joneugster', 'xroblot']	joneugster assignee:joneugster	2-64540 2 days ago	2-64540 2 days ago	25-50698 25 days
36777	jjdishere author:jjdishere	feat(Valuation/ValuativeRel): generalize `ValuativeRel` to non-commutative rings	This is the second in a series of PRs, with the final goal of removing the class `Valued` from Mathlib. A `Valued` instance will be replaced by `[ValuativeRel R] [UniformSpace R] [IsValuativeTopology R] [IsUniformAddGroup R] (v : Valuation R A) [v.Compatible]`. This PR generalize `ValuativeRel` from `CommRing` to `Ring` by adding a field `vle_mul_comm {x y} : vle (x * y) (y * x)`. Without this field, the value group associated to the valuative relation may be non-abelian. The APIs of `ValuativeRel.ofValuation` and `ValuativeRel.valuation` are also generalized, showing this new definition is indeed equivalent to the valuations on non commutative rings. This is a prerequisite of #36769 . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author merge-conflict	210/128	Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/DiscreteValuativeRel.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean,Mathlib/Topology/Algebra/ValuativeRel/ValuativeTopology.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	8	47	['JovanGerb', 'faenuccio', 'github-actions', 'jjdishere', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'riccardobrasca', 'wwylele']	faenuccio and riccardobrasca assignee:riccardobrasca assignee:faenuccio	2-59985 2 days ago	49-62765 49 days ago	11-64422 11 days
39388	marcelolynch author:marcelolynch	chore: remove @[expose] from def-free public sections	Strip `@[expose]` from `public section` headers in 100 modules where no declaration needs its body visible downstream. A new sweep in the style of #38480 Found using the linter-in-progress: #39387 Relevant Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Removing.20unnecessary.20.60.40.5Bexpose.5D.60/with/595180230		100/100	Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Opposite.lean,Mathlib/Algebra/Field/Rat.lean,Mathlib/Algebra/Field/ULift.lean,Mathlib/Algebra/Field/ZMod.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/Group/Action/Units.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Algebra/Module/Projective.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Action/End.lean,Mathlib/Algebra/Order/Group/End.lean,Mathlib/Algebra/Order/Group/PosPart.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Ring/Commute.lean,Mathlib/AlgebraicTopology/ModelCategory/Over.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Operator/Compact/FiniteDimension.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfLocalizedEquivalences.lean,Mathlib/CategoryTheory/MarkovCategory/Positive.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Normal.lean,Mathlib/CategoryTheory/Monoidal/Functor/Types.lean,Mathlib/CategoryTheory/Monoidal/Types/Coyoneda.lean,Mathlib/CategoryTheory/Sites/CoversTop/Over.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/FunLike/Embedding.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Data/Int/Cast/Pi.lean,Mathlib/Data/List/Monad.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Data/Rat/Cast/OfScientific.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/GroupTheory/GroupAction/Embedding.lean,Mathlib/GroupTheory/IsPerfect.lean,Mathlib/GroupTheory/ResiduallyFinite.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Star.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/Typeclasses/ZeroOne.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Transform.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/Padics/PadicVal/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Set/OrdConnected.lean,Mathlib/Order/Quotient.lean,Mathlib/Probability/Kernel/Deterministic.lean,Mathlib/RingTheory/Coalgebra/Convolution.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/HopfAlgebra/TensorProduct.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Localization/Finiteness.lean,Mathlib/RingTheory/Noetherian/Defs.lean,Mathlib/RingTheory/QuasiFinite/Basic.lean,Mathlib/RingTheory/QuasiFinite/Polynomial.lean,Mathlib/RingTheory/QuasiFinite/Weakly.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/Smooth/Fiber.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean,Mathlib/RingTheory/Unramified/LocalRing.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/IsTrivialOn.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean,Mathlib/Topology/EMetricSpace/Pi.lean,Mathlib/Topology/List.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean	100	6	['eric-wieser', 'github-actions', 'grunweg', 'marcelolynch', 'urkud']	nobody	2-58178 2 days ago	4-35947 4 days ago	4-35940 4 days
39323	lecopivo author:lecopivo	feat: fun_prop for integrability	setting up fun_prop with integrability --- - [ ] depends on: #39370 - [ ] depends on: #39371 - [ ] depends on: #39325 - [ ] depends on: #39329 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR merge-conflict	1713/55	Mathlib.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntegrableOnFunProp.lean,Mathlib/MeasureTheory/Integral/LocallyIntegrableOnFunProp.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Tactic/RunAutoParam.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean,MathlibTest/FunProp.lean,MathlibTest/FunPropMinimal.lean,MathlibTest/IntegrabilityTactic.lean,MathlibTest/RunAutoParam.lean,scripts/README.md,scripts/update-integrability-tactic-counts.sh	32	6	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-57854 2 days ago	5-29941 5 days ago	0-1508 25 minutes
39337	grunweg author:grunweg	chore: de-continuity	--- - [x] depends on: #39343 - [x] depends on: #39358 - [ ] depends on: #39359 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	43/11	Mathlib/AlgebraicTopology/SimplicialSet/TopAdj.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Topology/Algebra/MvPolynomial.lean,Mathlib/Topology/Algebra/SeparationQuotient/Section.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousMap/Basic.lean	10	5	['github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot']	nobody	2-57846 2 days ago	4-60892 4 days ago	0-32266 8 hours
37944	YaelDillies author:YaelDillies	refactor(Algebra): replace `SemilinearEquivClass.semilinearEquiv` by structure-specific coercions	Remove the coercion from `E` to `SemilinearEquiv` assuming `SemilinearEquivClass E` and given by `SemilinearEquivClass.semilinearEquiv`. For each concrete type, reimplement this coercion through the relevant structure projection. --- - [x] depends on: #38715 See also #21031, #37827. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	67/65	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/LinearAlgebra/CliffordAlgebra/BaseChange.lean,Mathlib/LinearAlgebra/Complex/Determinant.lean,Mathlib/LinearAlgebra/Complex/Module.lean,Mathlib/LinearAlgebra/GeneralLinearGroup/AlgEquiv.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Algebra.lean,Mathlib/RingTheory/Invariant/Profinite.lean,Mathlib/RingTheory/Smooth/Pi.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean	24	18	['Vierkantor', 'YaelDillies', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'themathqueen']	nobody	2-57329 2 days ago	2-57401 2 days ago	2-64076 2 days
38848	jcreinhold author:jcreinhold	feat(AlgebraicTopology/SimplicialSet): exists_isPushout_of_ne_top	Every proper subcomplex of a simplicial set extends by attaching a single cell along its boundary, exhibited as a pushout of `∂Δ[n] ↪ Δ[n]`. This is the per-cell input for cell-by-cell filtrations of monomorphisms in `SSet`. Adapted from @joelriou 's [proof](https://github.com/joelriou/topcat-model-category/blob/813338a8c88cfe0096deed7e3ba7daf92d4a1c71/TopCatModelCategory/SSet/Boundary.lean#L187). I also added the supporting lemma `Types.isPullback_of_eq_setPreimage` (set-preimage square is a pullback in `Type u`). AI use: Claude helped locate `subtype_val_mono` and the `backward.isDefEq.respectTransparency` option.	t-algebraic-topology new-contributor	120/3	Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/CategoryTheory/Limits/Types/Pullbacks.lean	2	24	['github-actions', 'jcreinhold', 'joelriou', 'mckoen']	joelriou assignee:joelriou	2-55830 2 days ago	9-34042 9 days ago	16-2812 16 days
39368	gasparattila author:gasparattila	feat: homogenization of an affine space	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	401/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Homogenization.lean,docs/references.bib	3	15	['eric-wieser', 'gasparattila', 'github-actions']	nobody	2-55344 2 days ago	4-46850 4 days ago	4-48045 4 days
39431	gasparattila author:gasparattila	feat: homogenization of an affine space (computable version)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	597/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Homogenization.lean,docs/references.bib	3	2	['eric-wieser', 'github-actions']	nobody	2-55338 2 days ago	unknown	0-0 0 seconds
37386	gasparattila author:gasparattila	chore: call `dsimp` in the default tactic of `ContinuousLinearMap`	--- This will also reduce the breakage in https://github.com/leanprover-community/mathlib4/pull/35548. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	32/73	Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/Notation.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/ConjSqrt.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Basic.lean,Mathlib/Probability/Distributions/Gaussian/IsGaussianProcess/Independence.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/LinearMapCompletion.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Star/LinearMap.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean	35	21	['gasparattila', 'github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'themathqueen']	j-loreaux assignee:j-loreaux	2-55121 2 days ago	2-55156 2 days ago	9-19271 9 days
35683	gasparattila author:gasparattila	fix(Tactic/FunProp): detect `Continuous.subtype_mk` as compositional	This PR changes `fun_prop` to detect some theorems involving dependent types, such as `Continuous.subtype_mk` to be in compositional form. This lets `fun_prop` solve goals such as `Continuous fun x => (⟨x, trivial⟩ : {x : ℝ // True})`. --- These theorems become compositional: `Continuous.subtype_mk`, `Topology.IsEmbedding.inclusion`, `Topology.IsOpenEmbedding.inclusion`, `Topology.IsClosedEmbedding.inclusion`, `Measurable.subtype_mk`, `Measurable.imp`, `Path.symm_continuous_family`, `Continuous.upperHalfPlaneMk` These theorems become simple: `hasFDerivAt_prodMk_left`, `hasFDerivAt_prodMk_right`, `contDiff_prodMk_left`, `contDiff_prodMk_right` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta maintainer-merge	66/44	Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,MathlibTest/FunPropMinimal.lean	5	27	['gasparattila', 'github-actions', 'grunweg', 'joneugster', 'lecopivo', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	2-54725 2 days ago	2-54796 2 days ago	82-60357 82 days
39110	SnirBroshi author:SnirBroshi	chore(Data/Set): reduce defeq abuse of `Set α = α → Prop`	These are among the first places that would fail if `Set α` wasn't defeq to `α → Prop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	35/20	Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Order/BooleanAlgebra/Set.lean	5	24	['SnirBroshi', 'Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'themathqueen', 'urkud', 'vihdzp']	nobody	2-53750 2 days ago	2-68701 2 days ago	8-70094 8 days
38026	mrdouglasny author:mrdouglasny	feat(Analysis/Calculus): define absolutely monotone functions	## Summary - Define `AbsolutelyMonotoneOn f s` for functions `f : ℝ → ℝ` that are smooth on `s` with all iterated derivatives within `s` nonneg - Prove closure under `add`, `smul`, `mul` - Show `exp`, `cosh`, constants, and powers are absolutely monotone on appropriate domains This is the first part of a split of #37879. Follow-up PRs will add: - Bernstein backward direction (nonneg coefficients → absolutely monotone) - Bernstein forward direction (absolutely monotone → analytic at 0) - Matrix applications (Schur product theorem for power series, entrywise exp) ## Test plan - [ ] CI passes (build + lint) - [ ] Verify `AbsolutelyMonotoneOn` structure and examples type-check 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.6 (1M context)	t-analysis new-contributor LLM-generated	119/0	Mathlib.lean,Mathlib/Analysis/Calculus/AbsolutelyMonotone.lean,docs/references.bib	3	33	['ADedecker', 'github-actions', 'j-loreaux', 'mrdouglasny', 'sgouezel', 'vihdzp', 'wwylele']	sgouezel assignee:sgouezel	2-52989 2 days ago	2-53056 2 days ago	22-46134 22 days
39298	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the pushout-product of a horn inclusion and a boundary inclusion is an anodyne extension	In this PR, we construct a regular pairing for the union of `Λ[m + 1, l] ⊗ ∂Δ[n]` and ` Δ[m + 1] ⊗ ∂Δ[n]` in `Δ[m + 1] ⊗ Δ[n]`. It follows immediately that the inclusion of this subcomplex is an anodyne extension. --- - [ ] depends on: #39462 - [ ] depends on: #39463 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP large-import blocked-by-other-PR	902/5	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/UnionProd.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/WeaklyPolyhedralLike.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	2-52496 2 days ago	5-58925 5 days ago	0-2 2 seconds
39457	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/Defs): lift more algebraic classes	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	52/4	Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-radar', 'urkud']	nobody	2-49011 2 days ago	2-58121 2 days ago	2-82641 2 days
30526	SnirBroshi author:SnirBroshi	chore(Logic/Relation): use `≤` to spell subrelation	Replace every `∀ x y, r x y → r' x y` with `r ≤ r'` --- NOTE: this PR began as an effort to use `Subrelation` since `≤` wasn't available in this file, but it was agreed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2330526.20use.20Subrelation.20in.20Mathlib.2ELogic.2ERelation/with/546572676) to instead make `≤` available there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	146/133	Mathlib.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Filtered/Connected.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Types/Coequalizers.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/TuringMachine/Config.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/Prop.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/Topology/Gluing.lean	19	22	['SnirBroshi', 'Vierkantor', 'eric-wieser', 'github-actions', 'joneugster', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'thorimur', 'vihdzp']	Vierkantor and joneugster assignee:Vierkantor assignee:joneugster	2-46529 2 days ago	2-46673 2 days ago	84-79631 84 days
38551	TTony2019 author:TTony2019	feat(Analysis/Convex/Intrinsic): add `affineSpan_prod_eq` and `intrinsicInterior_prod_eq`	### Summary We prove that the affine span of a product set equals the product of the affine spans, and that the intrinsic interior of a product set equals the product of the intrinsic interiors. - `affineSpan_prod_eq`: for `s : Set P₁` and `t : Set P₂`, `affineSpan k (s ×ˢ t) = (affineSpan k s) ×ˢ (affineSpan k t)` as sets. - `intrinsicInterior_prod_eq`: for `s : Set P` and `t : Set Q`, `intrinsicInterior 𝕜 (s ×ˢ t) = intrinsicInterior 𝕜 s ×ˢ intrinsicInterior 𝕜 t`. These two theorems are added to `Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean` and `Mathlib/Analysis/Convex/Intrinsic.lean`. ### Collaboration Co-authored-by: @imathwy	new-contributor	144/0	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/Prod.lean	5	22	['TTony2019', 'github-actions', 'wwylele']	nobody	2-45662 2 days ago	20-8028 20 days ago	22-38294 22 days
34435	huaizhangchu author:huaizhangchu	feat(Probability): convolution of Poisson distributions	This PR proves that the convolution of two Poisson distributions is again a Poisson distribution: `Poisson(r₁) ∗ Poisson(r₂) = Poisson(r₁ + r₂)` ## Main results - `poissonMeasureReal_charFun`: characteristic function of Poisson distribution is `exp(r(exp(it) - 1))` - `poissonMeasureReal_conv_poissonMeasureReal`: convolution of Poisson distributions on ℝ - `poissonMeasure_conv_poissonMeasure`: convolution of Poisson distributions on ℕ - `poissonMeasure_add_poissonMeasure_of_indepFun`: sum of independent Poisson random variables ## Proof strategy Uses characteristic functions: `φ(t) = exp(r(eⁱᵗ - 1))`, then pulls back from ℝ to ℕ. --- - [x] depends on: #34521 - [ ] depends on: #36374	t-measure-probability large-import new-contributor awaiting-author	123/17	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Probability/Distributions/Poisson/Basic.lean	2	93	['CoolRmal', 'DavidLedvinka', 'EtienneC30', 'github-actions', 'huaizhangchu', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'pfaffelh', 'vianna04', 'wwylele', 'yuanyi-350']	EtienneC30 assignee:EtienneC30	2-44519 2 days ago	2-44519 2 days ago	72-18139 72 days
39389	i-love-lean author:i-love-lean	feat(Analysis/SpecialFunctions): homeomorphism for spherical coordinates	A few months ago, I noticed that mathlib was missing change of variables to spherical coordinates, which is taught in undergraduate calculus and useful for many 3D integrals. So far, I used `PolarCoord.lean` as reference and implemented a similar homeomorphism for spherical coordinates. There's still a lot of work left to prove an analog of `integral_comp_polarCoord_symm` but for spherical coordinates, so I'm splitting up the work into several PRs. I also fixed a typo in `PolarCoord.lean`.	t-analysis new-contributor	133/2	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/SphericalCoord.lean	4	4	['github-actions', 'i-love-lean', 'wwylele']	nobody	2-42483 2 days ago	4-30321 4 days ago	4-31134 4 days
32583	MJ141592 author:MJ141592	refactor(SimpleGraph): change bridges not to require the edge to be present	Remove the requirement for edges to exist in definition of isBridge, and then change the related lemmas to adjust for this, by renaming, fixing the statements and fixing the proofs, including in Acyclic. Closes #31690. --- - [x] depends on: #36802 - [x] depends on: #36804	t-combinatorics new-contributor	95/93	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean	5	47	['MJ141592', 'Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	2-42349 2 days ago	2-43895 2 days ago	45-17731 45 days
36845	grunweg author:grunweg	feat: the Levi-Civita connection on a manifold	--- - [ ] depends on: #36299 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR merge-conflict	1162/0	Mathlib.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/LeviCivita.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Metric.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-41697 2 days ago	60-68789 60 days ago	0-512 8 minutes
35287	arnoudvanderleer author:arnoudvanderleer	feat(AlgebraicTopology/SimplicialSet): define isomorphisms in simplicial sets, and the coherent isomorphism simplicial set	show that any edge in a simplicial set, that is the image of the forward edge of the coherent isomorphism under a simplicial set morphism, is an isomorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor infinity-cosmos awaiting-author	362/3	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/CoherentIso.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveCodiscrete.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean	6	122	['arnoudvanderleer', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'robin-carlier']	robin-carlier assignee:robin-carlier	2-40836 2 days ago	2-40836 2 days ago	31-932 31 days
38014	cduenasnavarro author:cduenasnavarro	feat(InformationTheory): linear codes over finite fields and minimum distance properties	Define linear codes over a finite field `F` as finite-dimensional subspaces of `Fin n → F`, together with their minimum Hamming distance. Main definitions: * `LinearCode` * `minDist` * `LinearCodeWithDist` * `hammingSphere` Main results: * `minDist_eq_sInf_pairwiseDist`: characterisation of the minimum distance via pairwise distances * `disjoint_spheres`: Hamming spheres of radius `t` around distinct codewords are disjoint if `2 * t < d` Pending: * Choosing an adequate book reference --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor	181/0	Mathlib.lean,Mathlib/InformationTheory/Coding/LinearCode.lean	2	37	['cduenasnavarro', 'github-actions', 'linesthatinterlace', 'rkirov', 'vihdzp', 'wwylele']	nobody	2-40361 2 days ago	35-31611 35 days ago	35-32367 35 days
39082	emlis42 author:emlis42	feat(Analysis/Calculus/Deriv): add deriv_const_op	This PR adds some lemmas so `simp` can automatically evaluate derivatives of partially applied heterogeneous operations such as `HAdd.hAdd`, `HSub.hSub`, `HMul.hMul` `HDiv.hDiv`, and `HPow.hPow`.	t-analysis new-contributor	68/6	Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,MathlibTest/Deriv.lean	7	11	['emlis42', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	2-39117 2 days ago	2-39117 2 days ago	10-1110 10 days
39122	justus-springer author:justus-springer	feat(AlgebraicGeometry/Birational): Birationality and rationality of schemes	This is a first step (of hopefully many) towards some basic birational geometry. This PR adds `Birational/Birational.lean`, which defines predicates `Birational`, `BirationalOver` and `IsRationalOver` for arbitrary schemes and provides basic API (e.g. that they are equivalence relations, and that affine space is rational). Some notes on the choice of definitions: There are multiple ways to define what it means for two schemes to be birational to each other. A common one is: "There exists a rational map with a rational inverse". However, this would require defining composition of rational maps, which is not always defined (In order to compose `f : X ⤏ Y` with `g : Y ⤏ Z`, you need at least `X` preirreducible, `Y` nonempty and `f` dominant). On the other hand, I can define "There exist dense subsets `U : Opens X` and `V : Opens Y` such that `U ≅ V` as schemes" for any two schemes `X` and `Y`, with no conditions. Hence I chose that as a definition. I'm also working on defining composition of rational maps, and once that's done, there should be a theorem connecting the two definitions. For now, I've defined `IsRationalOver S X` to mean there exists a `n : Type 0` such that `X` is birational to `𝔸(n; S)`. I fixed the universe of `n` to avoid bad universe levels in the type of `IsRationalOver`. At least I wasn't able to find a way to make this universe polymorphic and make the linter happy, but maybe there is a way. All references on birational geometry I could find just work with finite-dimensional varieties anyway, which would fit in `Type 0`. - [x] depends on: #39316 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	302/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Birational/Birational.lean,Mathlib/AlgebraicGeometry/Restrict.lean	3	11	['chrisflav', 'erdOne', 'github-actions', 'justus-springer', 'mathlib-dependent-issues']	joelriou assignee:joelriou	2-38851 2 days ago	5-29655 5 days ago	8-36801 8 days
39317	justus-springer author:justus-springer	feat(AlgebraicGeometry/Birational): dominant rational maps	Add a predicate `RationalMap.IsDominant` and add basic API. This is in preparation for defining composition of rational maps (see #39445). See also [stacks#01RR](https://stacks.math.columbia.edu/tag/01RR). - [x] depends on: #39316 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	113/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Birational/Dominant.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	2-38794 2 days ago	5-29683 5 days ago	5-31266 5 days
37259	EtienneC30 author:EtienneC30	feat: blumenthal's zero-one law for Brownian motion	--- - [ ] depends on: #36616 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability blocked-by-other-PR large-import	1158/83	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/Probability/BrownianMotion/Basic.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/Integration.lean,Mathlib/Probability/Independence/Kernel/Indep.lean,Mathlib/Probability/Independence/ZeroOne.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Process/Filtration.lean	18	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-38315 2 days ago	unknown	0-0 0 seconds
37598	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Coloring): add lemmas about coloring and maps	--- Idea from this Zulip thread: [graph theory>Second Order Monadic Logic for Graph](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Second.20Order.20Monadic.20Logic.20for.20Graph/with/583013775) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	37/12	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	26	['IvanRenison', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	2-37479 2 days ago	2-37479 2 days ago	43-17890 43 days
37495	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Sum): add homomorphism, embedding and isomorphism of sums	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	58/2	Mathlib/Combinatorics/SimpleGraph/Sum.lean	1	18	['IvanRenison', 'YaelDillies', 'github-actions', 'mkaratarakis']	YaelDillies assignee:YaelDillies	2-37095 2 days ago	2-37136 2 days ago	41-63064 41 days
37779	mcdoll author:mcdoll	feat(Data/FunLike): introduce typeclasses for algebraic properties of `FunLike`	These typeclasses remove the need for each function space that has, e.g., a linear structure to define `add_apply`, `smul_apply`, etc. Instead after defining the the `Add` instance one also defines a `FunLikeAdd` instance (with a proof usually being `rfl`). Allows removing some boilerplate as theorems like `sum_apply` are currently proved in various files: after this PR, they can be proved in an abstract way. Moreover, we provide abbreviations for further structure (such as `Semigroup``) in the concrete function spaces. The usage of these typeclasses were prototyped in #33477 and will be merged in a separate PR. The docstrings were generated with AI (and heavily edited afterwards), everything else is handwritten. --- The previous PR #33477 has gotten quite a few merge conflicts, so I opened a new PR with just the new features. I would like to get the approval of this design before going through the library and change everything. I am open to either do this in this PR or a second one (or multiple for different parts). - [x] depends on: #38401 - [x] depends on: #38398 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	678/0	Mathlib.lean,Mathlib/Data/FunLike/Group.lean,Mathlib/Data/FunLike/IsApply.lean,Mathlib/Data/FunLike/Module.lean,Mathlib/Data/FunLike/Ring.lean	5	29	['Vierkantor', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mcdoll']	Vierkantor and j-loreaux assignee:Vierkantor assignee:j-loreaux	2-35984 2 days ago	2-36059 2 days ago	20-6513 20 days
39468	ADedecker author:ADedecker	feat: LinearMap.HasFiniteRank and the associated relation	This was written by @PatrickMassot at the May 2026 ICERM workshop as part of the project on Fredholm operators. This also adds three supporting lemmas: `map_smul_le_map`, `range_smul_le_range` and `ker_le_ker_smul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	194/8	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/FiniteRankLinearMap.lean	5	1	['github-actions']	nobody	2-35147 2 days ago	2-35222 2 days ago	2-37511 2 days
39472	NoahW314 author:NoahW314	feat(RingTheory/MvPolynomial/Homogeneous): add homogeneous lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	74/2	Mathlib/Data/Finsupp/Weight.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	3	1	['github-actions']	nobody	2-34393 2 days ago	2-34463 2 days ago	2-34650 2 days
39474	emlis42 author:emlis42	feat(Topology/Separation/Hausdorff): add `Filter.limUnder_congr`	This PR adds `Filter.limUnder_congr` and some lemmas about `limUnder`. `Filter.limUnder_congr` allows rewriting `limUnder` expressions using equivalences of convergence behavior, without proving the filters actually converge, allowing convergence proofs to be carried out on more convenient expressions latter.	t-topology new-contributor large-import	24/1	Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Topology/Separation/Hausdorff.lean	2	2	['github-actions']	nobody	2-33426 2 days ago	2-33509 2 days ago	2-33502 2 days
39120	wwylele author:wwylele	feat(MeasureTheory,Euclidean): area formula	This PR aims to prove the generalization of [MeasureTheory.lintegral_abs_det_fderiv_eq_addHaar_image](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/Jacobian.html#MeasureTheory.lintegral_abs_det_fderiv_eq_addHaar_image) in inner product spaces, where the domain and the codomain are allowed to be different. WIP. TODO: - Remove the restriction on f'.ker = bot - Rmoeve [SecondCountableTopology V] - Clean up the proof AI usage disclosure: Aristotle were used to prove some "trivial" lemma (measurability, summability etc.) --- - [ ] depends on: #37295 - [ ] depends on: #39132 - [ ] depends on: #39160 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	1957/5	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/NormDet.lean,Mathlib/Geometry/Euclidean/Volume/Area.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,docs/references.bib	6	2	['github-actions', 'mathlib-dependent-issues']	nobody	2-32842 2 days ago	unknown	0-0 0 seconds
39479	wwylele author:wwylele	chore(RingTheory/HahnSeries): remove a defeq abuse	Previously the simp implicitly uses `⟨⟨((↑) : ℕ → Γ),...⟩,...⟩.toFun = (↑)`. This explicitly writes out the intermediate term so the it no longer relies on defeq. Also changed the statement of ofPowerSeries_apply to reuse existing embedding --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory tech debt	9/12	Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/LaurentSeries.lean	2	1	['github-actions']	nobody	2-29983 2 days ago	2-30059 2 days ago	2-30160 2 days
39161	alreadydone author:alreadydone	feat(LinearAlgebra): commutative semirings satisfy strong rank condition	Co-authored-by: Aristotle (Harmonic) Thanks to ChatGPT and Gemini for converting part of Yi-Jia Tan's paper into LaTeX, which served as solutions provided to Aristotle. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra LLM-generated label:t-algebra$	616/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Nonsingular.lean,docs/references.bib	3	3	['SnirBroshi', 'github-actions']	nobody	2-28750 2 days ago	8-9105 8 days ago	0-3 3 seconds
7873	astrainfinita author:astrainfinita	perf: reorder `extends` and change instance priority in algebra hierarchy	There are no strict rules, but in general `Cancel` is dropped first, then `Comm`, then `Neg / Inv`, then `Assoc`. Not sure if there's a better way. An important goal is to search for `Zero/One/Add/Mul` instances first along `Zero/One/Add/Mul` -> ... -> `Ring` -> `CommRing` -> `Field`. --- - [ ] depends on: #14712 - [x] depends on: #16638 - [ ] depends on: #18464 - [ ] depends on: #18468 - [ ] depends on: #18470 - [ ] depends on: #18472 - [ ] depends on: #18474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	494/204	Archive/Imo/Imo1998Q2.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Multiplier.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/CategoryTheory/Preadditive/SingleObj.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Real/ENatENNReal.lean,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/Init/ZeroOne.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/MeasureTheory/Decomposition/Jordan.lean,Mathlib/MeasureTheory/Decomposition/SignedLebesgue.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean,Mathlib/Order/Filter/Germ.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean,Mathlib/RingTheory/Ideal/LocalRing.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/MvPolynomial/Symmetric.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Tactic/Positivity/Core.lean	104	84	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	2-26844 2 days ago	674-40455 674 days ago	3-36575 3 days
39422	eric-wieser author:eric-wieser	feat: add congruence lemmas for (d)finsupp big operators	Also adds the missing n-ary product lemmas to match the existing sum lemmas. Co-authored-by: Antoine Chambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	170/1	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Data/DFinsupp/BigOperators.lean,Mathlib/GroupTheory/Congruence/BigOperators.lean,Mathlib/RingTheory/Congruence/BigOperators.lean,Mathlib/RingTheory/TwoSidedIdeal/BigOperators.lean	5	17	['AntoineChambert-Loir', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	2-25510 2 days ago	3-25750 3 days ago	3-37615 3 days
39473	faenuccio author:faenuccio	feat(Topology.Homeomorph.Lemmas): add lemmas about `coe` and `IsHomeomorph`	Add lemmas `IsHomeomorph.coe_equiv` and `IsHomeomorph.coe_inv` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	7/1	Mathlib/Topology/Homeomorph/Lemmas.lean	1	2	['ADedecker', 'github-actions']	ADedecker assignee:ADedecker	2-23568 2 days ago	2-33952 2 days ago	2-33945 2 days
39449	Paul-Lez author:Paul-Lez	doc: add library note about scoping simp lemmas with weak keys	In PR #39262 I noticed that some `simp` lemmas were scoped for a reason that is not immediately obvious, so I figured that adding a library note would be nice in case anyone else runs into this in the future (this pattern is quite common in Mathlib!) In case it's helpful for review, here are links to a few of the PRs that added this scoping initially: - #14233 - #15620 - #15631 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		71/4	Mathlib.lean,Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/CharZero.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimpLibraryNote.lean	8	1	['github-actions']	nobody	2-19296 2 days ago	2-19364 2 days ago	2-19929 2 days
38911	Vierkantor author:Vierkantor	chore(Tactic): deprecate `substs` and replace it with `subst`	The `substs` tactic was a wrapper around `subst` to call it multiple times for different hypotheses. But `subst` now supports multiple hypotheses, so we can deprecate `substs` and replace it with `subst`. I added a deprecation warning using a `Try this:` message. Spotted while checking tactic docstrings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated	46/42	Archive/Examples/IfNormalization/WithoutAesop.lean,Mathlib/Algebra/Homology/DifferentialObject.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/CategoryTheory/Preadditive/Mat.lean,Mathlib/Computability/DFA.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/RingedSpace/Stalks.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Order/Concept.lean,Mathlib/Order/JordanHolder.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic/Substs.lean,Mathlib/Topology/Gluing.lean	22	17	['JovanGerb', 'Vierkantor', 'bryangingechen', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-bors', 'plp127']	thorimur assignee:thorimur	2-17519 2 days ago	9-17872 9 days ago	5-44109 5 days
39333	lecopivo author:lecopivo	feat(run_auto_param): tactic to run autoParam tactic	Tactic `run_auto_param` is designed to solve goals in the form `autoParam P tac` by executing tactic `tac` on the goal `P`. It is mainly meant to be used as a discharger for other tactics like `simp` or `fun_prop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	97/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/RunAutoParam.lean,MathlibTest/RunAutoParam.lean	4	8	['JovanGerb', 'fpvandoorn', 'github-actions', 'lecopivo']	JovanGerb assignee:JovanGerb	2-17012 2 days ago	3-31428 3 days ago	0-602 10 minutes
39413	vihdzp author:vihdzp	bug: turning theorem into alias breaks bound tactic	I have no idea what's going on. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra will-close-soon label:t-algebra$	1/3	Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean	1	1	['github-actions']	nobody	2-13258 2 days ago	unknown	0-0 0 seconds
39460	Deicyde author:Deicyde	feat(Algebra/Module/ZLattice): Quotient by `IsZLattice` is group isomorphic to `UnitAddTorus`	The main result `quotientAddEquivUnitAddTorus` constructs an isomorphism `(E ⧸ L) ≃+ UnitAddTorus ι` for any `IsZLattice ℝ L`. Currently left as a draft for educational purpose. See the Zulip thread [#mathlib4 > What Is A Torus?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/What.20Is.20A.20Torus.3F/with/595553420) for more discussion. --- - [ ] depends on: #39452 - [ ] depends on: #39453 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	67/6	Mathlib.lean,Mathlib/Algebra/Module/ZLattice/Torus.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/Topology/Instances/AddCircle/Real.lean	5	3	['github-actions', 'mathlib-dependent-issues']	nobody	2-13232 2 days ago	unknown	0-0 0 seconds
38227	vihdzp author:vihdzp	chore(Algebra/Order/Monoid/Unbundled/Basic): golfing + formatting	We make use of `variable`, fix some weird spacing, and golf many proofs. The only breaking change is that `mul_lt_iff_lt_one_left'`/`add_lt_iff_neg_left` now takes an explicit argument, matching the theorems surrounding it. --- Not too fond of the `calc` tactic. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order label:t-algebra$	233/501	Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Data/Real/Archimedean.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	2-12915 2 days ago	2-12975 2 days ago	2-27413 2 days
33288	vihdzp author:vihdzp	chore(Combinatorics/SimpleGraph/Paths): review API	This PR does the following: - Add `grind` annotations. - Rename theorems `X_isY` to the more idiomatic `isY_X`. - Remove many redundant namespaces. - Golf accordingly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	155/125	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean	6	3	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	2-11555 2 days ago	2-11628 2 days ago	45-28037 45 days
32828	Hagb author:Hagb	feat(Algebra/Order/Group/Defs): add `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`	It is similar to `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`, while with different hypotheses. The conclusion `IsOrderedCancelMonoid α` on `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid` still holds when the hypothesis `CommGroup α` is weakened to `CancelCommMonoid α` while `PartialOrder α` is strengthened to `LinearOrder α`. --- [`IsOrderedAddMonoid.toIsOrderedCancelAddMonoid`](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=IsOrderedAddMonoid.toIsOrderedCancelAddMonoid#doc) and `IsOrderedAddMonoid.toIsOrderedCancelAddMonoid'`: https://github.com/leanprover-community/mathlib4/blob/97f78b1a4311fed1844b94f1c069219a48a098e1/Mathlib/Algebra/Order/Group/Defs.lean#L52-L62 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	15	['Garmelon', 'Hagb', 'Vierkantor', 'artie2000', 'dagurtomas', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	2-10624 2 days ago	116-47047 116 days ago	40-42357 40 days
39441	Paul-Lez author:Paul-Lez	feat: small lemma about multilinear power series	I'm currently working on a PR that connects the `PowerSeries` API to the `FormalMultilinearSeries` API, and in particular constructs a map from `PowerSeries A` to `FormalMultilinearSeries R A A` for any `R`-algebra `A`. This lemma was useful for proving that this map respects composition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	7/0	Mathlib/Analysis/Analytic/Composition.lean	1	3	['Paul-Lez', 'github-actions', 'grunweg']	nobody	2-10571 2 days ago	3-23245 3 days ago	3-23238 3 days
33143	wwylele author:wwylele	feat(PowerSeries): pentagonal number theorem	The proof is split in two files: `Mathlib/Topology/Algebra/InfiniteSum/Pentagonal.lean` for the algebraic part, and `Mathlib/RingTheory/PowerSeries/Pentagonal.lean` for the summability part. In the near future, I also plan to prove the real/complex version that branches off from the algebraic part. --- - [x] depends on: #30436 - [x] depends on: #38179 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	361/6	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Pentagonal.lean,Mathlib/RingTheory/PowerSeries/Pentagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Pentagonal.lean,docs/1000.yaml	5	59	['copilot-pull-request-reviewer', 'github-actions', 'jcommelin', 'mathlib-dependent-issues', 'tb65536', 'urkud', 'vihdzp', 'wwylele']	chrisflav assignee:chrisflav	2-9589 2 days ago	17-15093 17 days ago	127-26943 127 days
37720	cjrl author:cjrl	feat(Data/Fintype/Card): existsUnique_notMem_image_of_injective_of_card_succ	This pull requests adds a small theorem `existsUnique_notMem_image_of_injective_of_card_succ` to `Mathlib/Data/Fintype/Card` that says given an injective map f : α → β such that β has cardinality one more than α, there exists a unique element of β not in the image of f. This can be viewed as going in the opposite direction of `card_lt_of_injective_of_notMem`. This little fact is needed for our Latin Square PR #36698. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor t-set-theory	19/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean	2	10	['IvanRenison', 'cjrl', 'dagurtomas', 'ghseeli', 'github-actions']	nobody	2-9042 2 days ago	2-9042 2 days ago	39-66291 39 days
39489	Paul-Lez author:Paul-Lez	fix: defeq abuse in HasFTaylorSeriesUpToOn.comp	Removes a `set_option backward.isDefEq.respectTransparency false`. The fix isn't as nice as I would have hoped (I tried to make it smaller but to no avail). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	5/2	Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean	1	1	['github-actions']	nobody	2-7784 2 days ago	2-7863 2 days ago	2-7856 2 days
35197	j-loreaux author:j-loreaux	feat: Hölder framework for `lp` spaces	--- - [ ] depends on: #35152 - [ ] depends on: #35198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	311/9	Mathlib.lean,Mathlib/Analysis/Normed/Lp/LpEquiv.lean,Mathlib/Analysis/Normed/Lp/lpHolder.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Tactic/Linter/TextBased.lean	6	13	['github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mcdoll', 'mike1729', 'themathqueen']	themathqueen assignee:themathqueen	2-7330 2 days ago	25-42705 25 days ago	44-45477 44 days
32829	Hagb author:Hagb	feat(Data/Finsupp/MonomialOrder): weaken `IsOrderedCancelAddMonoid` to `IsOrderedAddMonoid`	`IsOrderedCancelAddMonoid syn` (`.iocam`) can be obtained from `IsOrderedAddMonoid syn` and other fields. --- - [ ] depends on: #32828 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-order	11/2	Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Data/Finsupp/MonomialOrder.lean	2	9	['Hagb', 'Vierkantor', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	2-4847 2 days ago	157-1477 157 days ago	0-137 2 minutes
39494	Hagb author:Hagb	chore(Data/Finsupp/MonomialOrder): rename fields of `MonomialOrder` to match naming conventions	Moves: - MonomialOrder.acm -> MonomialOrder.addCommMonoid_syn - MonomialOrder.lo -> MonomialOrder.linearOrder_syn - MonomialOrder.iocam -> MonomialOrder.isOrderedCancelAddMonoid_syn - MonomialOrder.wf -> MonomialOrder.wellFoundedLT_syn --- Resolve https://github.com/leanprover-community/mathlib4/pull/32829#discussion_r2716534558. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	15/6	Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean	2	1	['github-actions']	nobody	2-4835 2 days ago	2-4726 2 days ago	2-5246 2 days
39214	Hagb author:Hagb	refactor(Data/Finsupp/MonomialOrder): remove `.wf` (well foundedness) field from `MonomialOrder`	Many properties still hold without the well-foundedness. Although Gröbner basis theory requires the monomial order to be well founded for the termination of the division algorithm (formalized in `MonomialOrder.div`), many properties that don't relay on the division or remainder still hold without the well-foundedness. Even the division algorithm can terminate in some cases where the monomial order isn't well founded. For example, if the divisors set is finite, then the algorithm can terminate w.r.t. `MonomialOrder.lex (σ := Nat)` even though it isn't well founded. Such cases cannot be directly stated if the formalization of monomial order requires well-foundedness. Deletions: - MonomialOrder.wf --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	21/13	Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean	4	4	['Hagb', 'github-actions', 'vihdzp']	nobody	2-4754 2 days ago	7-40783 7 days ago	7-40776 7 days
39495	hawkrobe author:hawkrobe	feat(Data/Multiset/Antidiagonal): two structural lemmas	Adds `map_swap_antidiagonal` and `antidiagonal_add` to `Multiset.antidiagonal` --- Fills out the API parallel to `Multiset.Nat.map_swap_antidiagonal` (cf. `Data/Multiset/NatAntidiagonal.lean`) and `Finset.map_swap_antidiagonal` (cf. `Algebra/Order/Antidiag/Prod.lean`). Used downstream for shuffle-coproduct constructions on `Multiset`-indexed free algebras. Both are `DecidableEq`-free given the structural-quotient nature of `Multiset.antidiagonal` (#7486, I found this old [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/antidiagonals.20having.20multiplicity.20.237595/near/238573473)) I used Claude Code to audit and polish.	t-data new-contributor	23/0	Mathlib/Data/Multiset/Antidiagonal.lean	1	2	['github-actions']	nobody	2-3663 2 days ago	2-4387 2 days ago	2-4380 2 days
38536	CoolRmal author:CoolRmal	feat: a lemma about the symmetric difference of unions	Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy delegated	58/2	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/CompleteBooleanAlgebra.lean	2	17	['CoolRmal', 'SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	2-3414 2 days ago	4-37203 4 days ago	7-75625 7 days
39435	tdM05 author:tdM05	feat(Algebra/Group/Subgroup/ZPowers): add Int.closure_eq_zmultiples	- Show that for `a b : ℤ`, `AddSubgroup.closure {a, b} = AddSubgroup.zmultiples (a.gcd b : ℤ)` - Used Claude to find the names of relevant theorems to use. However, I wrote the whole proof on my own.	t-algebra new-contributor label:t-algebra$	6/0	Mathlib/Algebra/Group/Subgroup/ZPowers/Lemmas.lean	1	18	['SnirBroshi', 'YanYablonovskiy', 'github-actions', 'tdM05']	nobody	1-83160 1 day ago	2-23282 2 days ago	3-24890 3 days
39443	justus-springer author:justus-springer	feat(Data/Set/Image): `nonempty_preimage_iff`	Basically a converse to `nonempty_of_nonempty_preimage`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	4/0	Mathlib/Data/Set/Image.lean	1	4	['Paul-Lez', 'github-actions', 'justus-springer', 'urkud']	nobody	1-77543 1 day ago	3-22320 3 days ago	3-22313 3 days
33392	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection/Generation): non-exceptional case in Dieudonné's theorem	We prove the theorem of [Dieudonné-1955][J. Dieudonné, “Sur les générateurs des groupes classiques”]. Let `K` be a division ring and `V` be a `K`-module. * `LinearEquiv.mem_transvections_pow_mul_dilatransvections_of_fixedReduce_eq_one`: If `e.fixedReduce = 1`, then `e` can be written as the product of `finrank K (V ⧸ e.fixedSubmodule) - 1` transvections and one dilatransvection. This is the first part of the non-exceptional case in Dieudonné's theorem. (This statement is not interesting when `e = 1`.) * `LinearEquiv.mem_transvections_pow_mul_dilatransvections_of_fixedReduce_ne_smul_id`: If `e.fixedReduce` is not a homothety, then `e` can be written as the product of `finrank K (V ⧸ e.fixedSubmodule) - 1` transvections and one dilatransvection. This is the second part of the non-exceptional case in Dieudonné's theorem. * `LinearEquiv.IsExceptional`: A linear equivalence `e : V ≃ₗ[K] V` is exceptional if `1 < finrank K (V ⧸ e.fixedSubmodule)` and if `e.fixedReduce` is a nontrivial homothety. * `LinearEquiv.mem_dilatransvections_pow_of_notIsExceptional`: This is the non-exceptional case in Dieudonné's theorem, as a combination of the two preceding statements. --- - [x] depends on: #33348 - [x] depends on: #33282 - [x] depends on: #33347 - [ ] depends on: #33387 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	551/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	4	16	['AntoineChambert-Loir', 'dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	1-74073 1 day ago	1-74141 1 day ago	49-26582 49 days
39493	ADedecker author:ADedecker	chore: switch `AlgHom.equalizer` from `AlgHomClass` to `AlgHom`	--- - [ ] depends on: #39487 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	31/36	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	1-73444 1 day ago	2-4519 2 days ago	0-1151 19 minutes
38200	Parcly-Taxel author:Parcly-Taxel	feat: Turán numbers and their strict monotonicity	`strictMonoOn_turanNumber` was initially proved by @Aristotle-Harmonic, then hand-polished. Co-authored-by: Aristotle (Harmonic)	t-combinatorics	45/20	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	3	['Parcly-Taxel', 'github-actions', 'tb65536']	nobody	1-73048 1 day ago	2-17551 2 days ago	30-72290 30 days
30351	JLimperg author:JLimperg	[Not a PR] Benchmark Aesop's lazy forward state construction	Testing the performance impact of an Aesop change. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict dependency-bump	3/3	lake-manifest.json,lakefile.lean	2	11	['JLimperg', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'niro4-1']	nobody	1-68186 1 day ago	unknown	0-0 0 seconds
38427	mckoen author:mckoen	feat(AlgebraicTopology/SimplicialSet): strong inner anodyne morphisms	Defines strong inner anodyne morphisms, WIP --- - [ ] depends on: #37869 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP merge-conflict	267/0	Mathlib.lean,Mathlib/AlgebraicTopology/Quasicategory/Basic.lean,Mathlib/AlgebraicTopology/Quasicategory/InnerFibration.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Inner/Basic.lean	4	4	['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-67306 1 day ago	25-37461 25 days ago	0-14 14 seconds
39499	MichaelStollBayreuth author:MichaelStollBayreuth	chore: run `lake shake` successively from the leaves	We do the experiment from #39481 in reverse order: starting from the leaves, run `lake shake --force --only --fix` and then `lake build` until something breaks. Then fix the problems manually and continue. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt	8057/0	MS_test/topsort.txt	1	2	['MichaelStollBayreuth', 'github-actions']	nobody	1-66179 1 day ago	1-78938 1 day ago	0-1 1 second
39487	ADedecker author:ADedecker	chore: switch `EqLocus` from `LinearMapClass` to `LinearMap`	--- Note: this PR was opened at 35000 feet :slightly_smiling_face: [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	20/17	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	5	8	['ADedecker', 'b-mehta', 'github-actions', 'themathqueen']	nobody	1-64672 1 day ago	2-5599 2 days ago	2-7539 2 days
26212	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): the Rees theorem for depth	In this PR we proved the Rees theorem for depth. Co-authored-by: Hu Yongle --- - [x] depends on: #37355 - [x] depends on: #38613 - [ ] depends on: #38466 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR large-import	287/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	7	60	['Thmoas-Guan', 'alreadydone', 'chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	1-63309 1 day ago	50-1415 50 days ago	94-80616 94 days
26214	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of depth	In this PR, we defined the depth of two modules as the minimal order of nonvanishing `Ext` and the `I-depth` for ideal `I` and some basic properties. Including the equivalence of the two in the condition of rees theorem. --- - [ ] depends on: #26212 - [x] depends on: #32966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	697/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	8	9	['Thmoas-Guan', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-63289 1 day ago	332-57806 332 days ago	0-152 2 minutes
38047	mbkybky author:mbkybky	feat(RingTheory/Finiteness/Ideal): `I` is finitely generated if `f(I)` and `I ∩ ker(f)` are finitely generated	Let `f : R →+* S` be a surjective ring homomorphism, and let `I` be an ideal of `R`. If `f(I)` and `I ∩ ker(f)` are finitely generated ideals, then `I` is also finitely generated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	13/3	Mathlib/RingTheory/Finiteness/Ideal.lean	1	1	['github-actions']	mattrobball assignee:mattrobball	1-63215 1 day ago	7-54553 7 days ago	34-3201 34 days
39231	mbkybky author:mbkybky	chore(RingTheory/PicardGroup): drop `StrongRankCondition` assumptions in two lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	3/6	Mathlib/RingTheory/PicardGroup.lean	1	1	['github-actions']	nobody	1-63121 1 day ago	6-82487 6 days ago	7-5470 7 days
39067	mbkybky author:mbkybky	feat(Algebra/Module): define modules admitting finite free resolutions	We say that an `R`-module `M` has a finite free resolution if there exists an exact sequence `0 ⟶ Eₙ ⟶ ⋯ ⟶ E₀ ⟶ M ⟶ 0` such that `Eᵢ` are finite free `R`-modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	186/0	Mathlib.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/FiniteFreeResolution/Basic.lean	3	1	['github-actions']	nobody	1-63077 1 day ago	7-46355 7 days ago	10-69341 10 days
39420	mbkybky author:mbkybky	feat(RingTheory/LocalProperties): `Module.Invertible` is a local property	Let `M` be a finite `R`-module. We show that `M` is invertible if `Mₘ` is invertible for any maximal ideal `m` of `R`. - [ ] depends on: #39109 - [ ] depends on: #39412 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	345/12	Mathlib.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/RingTheory/Flat/LocallyFree.lean,Mathlib/RingTheory/LocalProperties/FinitePresentation.lean,Mathlib/RingTheory/LocalProperties/Invertible.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Finiteness.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/Support.lean	11	2	['github-actions', 'mathlib-dependent-issues']	nobody	1-62866 1 day ago	3-42672 3 days ago	0-773 12 minutes
26215	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Auslander–Buchsbaum theorem	This PR mainly proved the Auslander-Buchsbaum theorem stating for a noetherian local ring `R` and a finitely generated `R` module `M` , `proj.dim(M) + depth(M) = depth(R)`. Co-authored-by: Yongle Hu --- - [ ] depends on: #26214 - [ ] depends on: #32316 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	1076/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	9	11	['Thmoas-Guan', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-62443 1 day ago	332-57807 332 days ago	0-88 1 minute
26216	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): depth of QuotSMulTop	In this PR, we proved for a local ring `R` and a finitely generated `R` module `M N`, `IsSMulRegular M x` and `x ∈ Module.annihilator R N`, then `depth(N, M/xM) + 1 = depth(N, M)`, and its corollary for quotient regular seqence. --- - [ ] depends on: #26214 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	962/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	8	9	['Thmoas-Guan', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-62402 1 day ago	332-59752 332 days ago	0-49 49 seconds
26217	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ischebeck theorem	This PR mainly proved the Ischbecke theorem, stating that `depth(N,M)` is greater or equal to `depth(M) - dim(N)` for finitely generated module `N, M` over local ring. --- - [ ] depends on: #26214 - [x] depends on: #32081 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	905/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	9	11	['Thmoas-Guan', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-62286 1 day ago	332-59630 332 days ago	0-51 51 seconds
26218	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of cohen macaulay	In this PR, we added the definition of CM module, CM local ring (extending local ring), and CM ring. We also proved Theorem 30, Chater 6, _Commutative Algebra_, Matsumura. --- - [x] depends on: #26219 - [ ] depends on: #26217 - [ ] depends on: #26216 - [ ] depends on: #28582 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	1730/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	11	19	['Thmoas-Guan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-61862 1 day ago	332-59474 332 days ago	0-52 52 seconds
28599	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): polynomial over CM ring is CM	polynomial over Cohen Macaulay ring is Cohen Macaulay --- - [ ] depends on: #26218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR large-import	1904/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Polynomial.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	12	17	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	1-61791 1 day ago	89-7557 89 days ago	3-48641 3 days
39408	fgdorais author:fgdorais	feat(Tactic/Linter/DeprecatedModule): add option `linter.deprecated.module.exclude_root`	This PR fixes an incorrect behavior in the deprecated module linter: the linter excluded all modules with filenames ending with `Mathlib.lean` without checking that the file is the Mathlib root module rather than a random module whose name happens to end with `Mathlib` (such are more plausible in downstream projects than in Mathlib itself). The Mathlib root module is autogenerated and imports all modules regardless of deprecation status. So it needs to be excluded from the deprecated module check. An easy way to correct the erroneous behavior would be to remove the hard-coded exclusion from the linter and add `set_option linter.deprecated.module false` at the end of `Mathlib.lean`. However, this PR takes a broader approach, which is to add a `linter.deprecated.module.exclude_root` option. That way downstream projects with a similarly designed root module can also use this feature by setting `linter.deprecated.module.exclude_root` to `true` in their lakefile. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter maintainer-merge	19/3	Mathlib/Tactic/Linter/DeprecatedModule.lean,lakefile.lean	2	11	['JovanGerb', 'adomani', 'fgdorais', 'github-actions']	JovanGerb assignee:JovanGerb	1-61465 1 day ago	3-64656 3 days ago	3-64649 3 days
38698	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Regular): freeness of `QuotSMulTop`	For finitely generated module `M` over Noetherian local ring `(R, m)`, if `x ∈ m` is `M`-regular, `M/xM` is free over `R/(x)` iff `M` is free over `R`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	114/0	Mathlib.lean,Mathlib/RingTheory/Regular/Free.lean	2	1	['github-actions']	chrisflav assignee:chrisflav	1-59640 1 day ago	1-59700 1 day ago	20-3153 20 days
29558	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): definition of global dimension	In this PR, we define projective dimension and global dimension using `CategoryTheory.HasProjectiveDimensionLT` --- - [ ] depends on: #32058 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	284/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RingTheory/GlobalDimension.lean	4	17	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	1-59303 1 day ago	140-71421 140 days ago	27-39406 27 days
31999	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): global dimension equals the supremum over localizations	Global dimension of ring is equal to supremum of global dimension over localizations at all prime/maximal ideal. --- - [x] depends on: #32000 - [x] depends on: #31998 - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory	366/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RingTheory/GlobalDimension.lean	4	17	['Thmoas-Guan', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-59281 1 day ago	174-69721 174 days ago	1-68813 1 day
37680	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Clique): add lemmas about isomorphisms and cliques	--- Idea from this Zulip thread: [#graph theory>Second Order Monadic Logic for Graph ](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Second.20Order.20Monadic.20Logic.20for.20Graph/with/583013775) - [x] depends on: #37649 - [x] depends on: #37640 - [x] depends on: #37676 - [ ] depends on: #37697 - [ ] depends on: #37700 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	156/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-58307 1 day ago	unknown	0-0 0 seconds
37579	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemmas about the length of a walk being equal to the girth	--- - [x] depends on: #37561 - [ ] depends on: #37577 - [x] depends on: #37574 - [ ] depends on: #37562 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	188/79	Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-57711 1 day ago	46-21897 46 days ago	0-678 11 minutes
39509	mcdoll author:mcdoll	chore(Topology): add `push/pull_end` tags for CLMs	Simpsets were introduced in #38359, see also #39508 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	2/0	Mathlib/Topology/Algebra/Module/LinearMap.lean	1	1	['github-actions']	nobody	1-56233 1 day ago	1-56268 1 day ago	1-56302 1 day
39476	faenuccio author:faenuccio	feat(Mathlib.Topology.Algebra.Module.Equiv): add results on IsHomeomorph	Add the construction of a `ContinuousLinearEquiv` from a `LinearEquiv` that `IsHomeomorph`, and two basic API lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	46/17	Mathlib/Topology/Algebra/Module/Equiv.lean	1	1	['github-actions']	ADedecker assignee:ADedecker	1-55707 1 day ago	1-55776 1 day ago	1-58348 1 day
39471	sgouezel author:sgouezel	chore: try improving priority along main spine	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	41/32	Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Analysis/Normed/Algebra/GelfandFormula.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Nat/Choose/Vandermonde.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/NumberTheory/ArithmeticFunction/Carmichael.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/WittPolynomial.lean,Mathlib/Topology/Algebra/Polynomial.lean	21	6	['github-actions', 'leanprover-radar', 'mathlib-bors', 'sgouezel']	nobody	1-54472 1 day ago	1-54474 1 day ago	0-8756 2 hours
39504	WenrongZou author:WenrongZou	feat(MvPowerSeries/Ideal): kernel of map equals map `C` of kernel	In this PR, we prove that given a ring homomorphism f, suppose that kernel of f is finitely generated, then kernel of map equals map `C` of kernel. (See `ker_map_of_FG`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	87/0	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/Ideal.lean	2	4	['CoolRmal', 'WenrongZou', 'github-actions']	nobody	1-53924 1 day ago	1-64241 1 day ago	1-64534 1 day
38739	CoolRmal author:CoolRmal	feat: Analytic Hahn Banach theorem for locally convex spaces	Closes #38419 This PR proves Hahn-Banach theorem for locally convex spaces, which allow us to generalize both [ContinuousLinearMap.exist_extension_of_finiteDimensional_range](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Module/HahnBanach.html#ContinuousLinearMap.exist_extension_of_finiteDimensional_range) and [Submodule.ClosedComplemented.of_finiteDimensional](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Module/HahnBanach.html#Submodule.ClosedComplemented.of_finiteDimensional) (I also moved these two lemmas to the new file I created). Some helper lemmas about continuity of seminorms/linear functions are added. Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis delegated	185/57	Mathlib.lean,Mathlib/Analysis/LocallyConvex/HahnBanach.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Seminorm.lean	5	17	['ADedecker', 'CoolRmal', 'github-actions', 'j-loreaux', 'mathlib-bors']	ADedecker assignee:ADedecker	1-49678 1 day ago	8-31425 8 days ago	10-63110 10 days
37914	j-loreaux author:j-loreaux	feat: transfer `star`-related instances across equivalences	This also adds `Function.Injective.{InvolutiveStar,...}` and related lemmas. In addition we rename the existing `Equiv.star` to `Equiv.Perm.star` (without a deprecation) so that the name can be used for the declaration which transfers a `Star` instance across an `Equiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra maintainer-merge label:t-algebra$	95/2	Mathlib.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/TransferInstance.lean	4	15	['SnirBroshi', 'github-actions', 'themathqueen']	themathqueen assignee:themathqueen	1-47876 1 day ago	25-39755 25 days ago	25-41657 25 days
37976	CoolRmal author:CoolRmal	feat(MeasureTheory): Lusin's theorem	We prove several versions of Lusin's theorem, all of which roughly says that measurable functions are continuous on nearly all its domain. --- - [x] depends on: #38533 - [x] depends on: #38535 - [ ] depends on: #38536 - [x] depends on: #38538 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR large-import merge-conflict	792/14	Mathlib.lean,Mathlib/MeasureTheory/Function/LusinContinuous.Lean,Mathlib/MeasureTheory/Measure/Tight.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Separation/GDelta.lean,Mathlib/Topology/Separation/Hausdorff.lean,docs/1000.yaml	8	15	['CoolRmal', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1-47064 1 day ago	35-76489 35 days ago	0-17 17 seconds
39511	chenson2018 author:chenson2018	chore(Topology): remove repeated `grind` from `DenselyOrdered.subsingleton_of_discreteTopology`	This proof can be rewritten into a single use of `grind` that is almost identical and maybe more clear with the purpose of the rewrites. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	2/3	Mathlib/Topology/Order/DenselyOrdered.lean	1	1	['github-actions']	nobody	1-46645 1 day ago	1-46730 1 day ago	1-46723 1 day
39427	Hagb author:Hagb	feat(Order/Interval/Finset/Defs): `LocallyFiniteOrder{Bot,Top}` implies `WellFounded{LT,GT}`	--- - [ ] depends on: #39425 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	22/25	Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Preorder/Finite.lean	2	5	['Hagb', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues']	nobody	1-46271 1 day ago	3-35801 3 days ago	0-1575 26 minutes
26088	grunweg author:grunweg	chore(Linter/DirectoryDependency): move forbidden directories into a JSON file	This PR continues the work from #25406. Original PR: https://github.com/leanprover-community/mathlib4/pull/25406	please-adopt t-linter merge-conflict	387/19	Mathlib/Tactic/Linter/DirectoryDependency.lean,scripts/README.md,scripts/forbiddenDirs.json	3	7	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'rosborn']	nobody	1-45004 1 day ago	264-69983 264 days ago	0-2565 42 minutes
38745	FordUniver author:FordUniver	refactor(Combinatorics/SimpleGraph/Copy): rename copy counts, align variable names, clean up docstring	Renames `labelledCopyCount` to `copyCount` and reassigns the previous `copyCount` to `unlabeledCopyCount`. Unifies graph-variable letters to the standard `G`uest / `H`ost convention. Restructures and cleans up the module docstring. --- Step 2/5 of the `Copy` / `InducedCopy` refactor-feat stack. Originally motivated by [a adiscussion](https://github.com/leanprover-community/mathlib4/pull/38631#discussion_r3163732684) in #38631 by @SnirBroshi that the British spelling of `labelled` is deprecated; see also discussion on Zulip ([#general > SimpleGraph.Copy is labeled but copyCount is not](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/SimpleGraph.2ECopy.20is.20labeled.20but.20copyCount.20is.20not)). The addition of the new `Sub` type was separated into #39307 as a requirement to keep the diff somewhat readable. On top of the Zulip discussion I also unified the argument naming to always follow the `G`uest / `H`ost convention. This highlighted a discrepancy where we write `Copy G H` but `copyCount H G`. I left this untouched since small-first-big-later seems to be the type and big-first-small-later the ops norm in mathlib. I am happy to align them if someone has a strong opinion either way. I also adjusted a ton of docstrings since the rename was already touching them, so it seemed sensible to use this opportunity for cleanup. Open to suggestions for what should be done differently. I also considered replacing `Bot`/`Top` with `EmptyGraph`/`CompleteGraph` in args and statement names (@SnirBroshi that was the now-closed #39303 ) because I thought that was established with #23838 but it seems [controversial](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/completeGraph.20vs.20.E2.8A.A4), so I have reverted it. \| notion \| before \| after \| \|---\|---\|---\| \| labelled copy / injective hom / monomorphism \| `Copy A B` \| `Copy G H` \| \| count of labelled copies \| `G.labelledCopyCount H` \| `H.copyCount G` \| \| count of unlabelled copies \| `G.copyCount H` \| `H.unlabeledCopyCount G` \| \| killing operation \| `G.killCopies H` \| `H.killCopies G` \| \| graph variables \| mixed `A B C` / `α β γ` and `G H I` / `V W X` \| uniform `G H I` / `V W X` (+ `G'`/`H'` on `V'`/`W'`) \| - [ ] depends on: #39307 Diff for the changes just in this PR over its predecessor: [link](https://github.com/FordUniver/mathlib4/compare/feat/copy-sub-abbrev...chore/copy-spelling)	t-combinatorics new-contributor blocked-by-other-PR	234/240	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	21	['FordUniver', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mitchell-horner']	nobody	1-42542 1 day ago	5-50079 5 days ago	11-52734 11 days
39203	FordUniver author:FordUniver	refactor(Analysis/Calculus/Gradient): ungate inner_gradient lemmas	Removes superfluous differentiability hypotheses (plus `UniqueDiffWithinAt` for the `Within` versions) from the four `inner_gradient[Within]_[left\|right]` lemmas: `gradient` is defined as `(toDual 𝕜 F).symm (fderiv 𝕜 f x)`, so `⟪∇ f x, y⟫ = fderiv 𝕜 f x y` holds unconditionally since both sides are zero when `f` is not differentiable at `x`. --- Genuinely unsure about this one because the only call I currently have in my code itself has the differentiability hypothesis. But including unused (or unnecessary) assumptions seems not intentional? My best guess is that the hypotheses were included by analogy with `HasGradientAt.fderiv_apply`, which genuinely needs them. This PR drops the hypotheses and rewrites the proofs through the isomorphism directly; no existing mathlib callers pass the now-redundant arguments.	t-analysis maintainer-merge	17/10	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	6	['FordUniver', 'Komyyy', 'github-actions']	urkud assignee:urkud	1-41550 1 day ago	7-51740 7 days ago	7-51733 7 days
39437	ooovi author:ooovi	feat(Geometry/Convex/ConvexSpace): show that an `AffineMap` `IsAffineMap`	Show that `Convexity.IsAffineMap` generalises `AffineMap`s between affine spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	24/3	Mathlib/Geometry/Convex/ConvexSpace/AffineSpace.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean	2	1	['github-actions']	nobody	1-40408 1 day ago	3-25059 3 days ago	3-25052 3 days
37848	rwst author:rwst	feat(RingTheory/PowerSeries/Log): log and exp as inverses	This adds the lemmas `exp_subst_log` and `log_subst_exp_sub_one`, together with two helpers needed for the proofs. Note: I'm using Claude + Opus for supervised formalization tasks. Claude has no permission to use git on my machine. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory LLM-generated	88/0	Mathlib/RingTheory/PowerSeries/Log.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	10	['chrisflav', 'github-actions', 'rwst']	chrisflav assignee:chrisflav	1-40323 1 day ago	7-50452 7 days ago	38-32921 38 days
36385	CoolRmal author:CoolRmal	feat: a sequential and countably compact space is sequentially compact	The main result proved in this PR is that a sequential and countably compact space is sequentially compact. We also prove some lemmas: 1. If `f` is an embedding, then `A` is sequentially compact iff `f '' A` is sequentially compact. This result is then used to show the equivalence of `IsSeqCompact A` and `SeqCompactSpace A`. 2. If `f` is inducing, then `A` is countably compact iff `f '' A` is countably compact. This result is then used to show the equivalence of `IsCountablyCompact A` and `CountablyCompactSpace A`. 3. If `f` converges and `g` is another function such that `g x ∈ closure {f x}` for all `x`, then `g` also converges. --- - [x] depends on: #36174 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	158/13	Mathlib/Topology/Compactness/CountablyCompact.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Sequences.lean,docs/references.bib	4	39	['ADedecker', 'CoolRmal', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'scholzhannah']	j-loreaux assignee:j-loreaux	1-39930 1 day ago	1-39930 1 day ago	41-66821 41 days
39307	FordUniver author:FordUniver	feat(Combinatorics/SimpleGraph/Copy): introduce `UnlabeledCopy` carrier subtype	Adds `abbrev UnlabeledCopy A B := {B' : B.Subgraph // Nonempty (A ≃g B'.coe)}` and uses it to replace the previous inline filter-set body of `copyCount G H`. Drops the now unused legacy Finset-image bridge `copyCount_eq_card_image_copyToSubgraph`. Adds `uniqueUnlabeledCopyBot` instance so `copyCount_bot` is a one-liner via `Fintype.card_unique`. --- Step 1/5 of the `Copy` / `InducedCopy` refactor-feat stack. This PR isolates the `UnlabeledCopy` type introduction and the count's type-form redefinition from the larger rename/convention work in the rest of the stack. Note that resolving the current clash in naming (`Copy` and `UnlabeledCopy` vs `labelledCopyCount` and `copyCount`) is part of #38745.	t-combinatorics	32/29	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	6	['FordUniver', 'github-actions', 'mathlib-bors', 'mitchell-horner']	nobody	1-38297 1 day ago	1-47581 1 day ago	5-47548 5 days
38843	FordUniver author:FordUniver	chore(Combinatorics/SimpleGraph/Copy): replace file-wide @[expose] with selective exposure	Removes the file-wide `@[expose] public section` and restores selective `@[expose]` only on the small constructive `def`s that need cross-module reduction: `Copy.toEmbedding`, `Copy.id`, `Copy.ofLE`, `Copy.topEmbedding` — each has an exported `@[simp]` lemma proved by `rfl` that needs the definition unfolded to typecheck. Replaces `@[simps!]` on `topEmbedding` with an explicit `@[simp] topEmbedding_apply` to avoid a private `_proof_1` term leaking into generated lemma names; adds `toEmbedding_apply` to match the existing `toHom_apply`. Switches `IsIndContained` from `def` to `abbrev` so the structural alias `Nonempty (G ↪g H)` stays transparent, matching `IsContained` and `Free`. --- Step 3/5 of the `Copy` / `InducedCopy` refactor-feat stack. The noncomputable counts `copyCount` and `unlabeledCopyCount` are deliberately not exposed (see [@plp127's review](https://github.com/leanprover-community/mathlib4/pull/38631#discussion_r3161902380) on #38631 explaining that unfolding a `classical`-`Fintype.card` body is rarely what you want); the downstream consumers in #38631 bridge via public `_eq_nat_card` lemmas introduced in #38931 instead. - [ ] depends on: #39307 - [ ] depends on: #38745 Diff for the changes just* in this PR over its predecessor: [link](https://github.com/FordUniver/mathlib4/compare/chore/copy-spelling...chore/copy-expose)	t-combinatorics new-contributor blocked-by-other-PR	245/246	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	4	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	1-38296 1 day ago	5-67582 5 days ago	0-76500 21 hours
38917	yuanyi-350 author:yuanyi-350	chore(CategoryTheory/Comma/Basic): remove an erw	- rewrites the `full_map` proof by pushing `Functor.comp_map` and the naturality equalities into a single `rw`/`simp only` chain - removes the `erw`-based transport of `α.naturality_assoc` and `β.naturality` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated awaiting-author	5/5	Mathlib/CategoryTheory/Comma/Basic.lean	1	2	['github-actions', 'loefflerd']	nobody	1-33797 1 day ago	1-33797 1 day ago	13-30201 13 days
39514	SnirBroshi author:SnirBroshi	chore(RingTheory/Polynomial/Basic): golf `degreeLTEquiv`	Also extracts the `monomial i a ∈ degreeLT R n` proof to a lemma. --- The semicolons might be a bit excessive, let me know if so. Also the `right_inv` proof is slower than the previous version, so maybe it should be reverted, but the rest is fine. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	11/32	Mathlib/RingTheory/Polynomial/Basic.lean	1	1	['github-actions']	nobody	1-33722 1 day ago	1-34008 1 day ago	1-34409 1 day
36954	FMLJohn author:FMLJohn	feat(Topology/ClosedBases): `TopologicalSpace.IsClosedBasis` and `TopologicalSpace.IsClosedSubbasis s`	In this pull request, I have defined closed bases and closed subbases of topologies, and proved some basic properties of them. ## Main definitions * `TopologicalSpace.IsClosedBasis s`: A closed basis of a topological space `α` is a collection of closed sets `s : Set (Set α)` such that every closed subset of `α` can be written as an intersection of elements of `s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	117/0	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/ClosedBases.lean	3	19	['github-actions', 'scholzhannah']	urkud assignee:urkud	1-33288 1 day ago	25-60043 25 days ago	54-62362 54 days
39516	SnirBroshi author:SnirBroshi	chore(RingTheory/Polynomial/Resultant/Basic): delete solved TODO about the Sylvester map	Introduced by #26285, solved by #31864. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory easy	0/5	Mathlib/RingTheory/Polynomial/Resultant/Basic.lean	1	1	['github-actions']	nobody	1-33055 1 day ago	1-33132 1 day ago	1-33125 1 day
38916	yuanyi-350 author:yuanyi-350	chore(CategoryTheory/CatCommSq): remove an erw	- rewrites `hInv_hInv` by using `conv_rhs` with `iso_hom_naturality` - removes the `rw`/`erw` pair around `Functor.comp_map` Extracted from #38415 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex LLM-generated	3/2	Mathlib/CategoryTheory/CatCommSq.lean	1	2	['github-actions', 'loefflerd']	nobody	1-32476 1 day ago	14-64000 14 days ago	14-63993 14 days
39155	mathlib-nolints author:mathlib-nolints	chore: lake shake --add-public --keep-implied --keep-prefix --fix	I am happy to shake some imports for you! 381 files changed · +406 imports added · -346 imports removed --- [workflow run for this PR](https://github.com/leanprover-community/mathlib4/actions/runs/26001831423) [explain.txt](https://github.com/leanprover-community/mathlib4/actions/runs/26001831423/artifacts/7045805363)	large-import	406/346	Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Saturation.lean,Mathlib/Algebra/Group/Submonoid/Support.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/MapBijective.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/ModelCategory/Injective.lean,Mathlib/Algebra/Homology/ModelCategory/Lifting.lean,Mathlib/Algebra/Lie/CartanCriterion.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/Module/Submodule/Invariant.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MvPolynomial/Cardinal.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Nilpotent.lean,Mathlib/Algebra/NonAssoc/PreLie/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/Cast.lean,Mathlib/Algebra/Order/SuccPred.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/Morphisms/Finite.lean,Mathlib/AlgebraicGeometry/Morphisms/FlatRank.lean,Mathlib/AlgebraicGeometry/Morphisms/SchemeTheoreticallyDominant.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Morphisms/WeaklyEtale.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicTopology/SimplicialCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialComplex/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/CStarAlgebra/Projection.lean,Mathlib/Analysis/Calculus/DerivativeTest.lean,Mathlib/Analysis/Calculus/FDeriv/Affine.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/LogDeriv.lean,Mathlib/Analysis/Complex/CanonicalDecomposition.lean,Mathlib/Analysis/Complex/Harmonic/Liouville.lean,Mathlib/Analysis/Complex/Harmonic/Poisson.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/Approximation.lean,Mathlib/Analysis/Convex/FunctionTopology.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/Analysis/Normed/Module/DoubleDual.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean,Mathlib/Analysis/RCLike/ContinuousMap.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/RingInverseOrder.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/ChebyshevGauss.lean,Mathlib/CategoryTheory/Abelian/Preradical/Colon.lean,Mathlib/CategoryTheory/Adhesive/Subobject.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Widesubcategory.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Jointly.lean,Mathlib/CategoryTheory/Limits/Constructions/WidePullbackOfTerminal.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Terminal.lean,Mathlib/CategoryTheory/Limits/Preserves/SigmaConst.lean,Mathlib/CategoryTheory/Limits/Preserves/Yoneda.lean,Mathlib/CategoryTheory/Limits/Yoneda.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Normal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon.lean,Mathlib/CategoryTheory/Monoidal/Widesubcategory.lean	381	26	['JovanGerb', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	1-29654 1 day ago	1-29690 1 day ago	4-1595 4 days
39223	BryceT233 author:BryceT233	feat(RingTheory/Extension): surjectivity and kernel of `Cotangent.map`	This PR adds `Cotangent.map_surjective_of_comap_eq` and `Cotangent.map_ker_of_surjective`, which are adaptations of the existing lemmas `Ideal.mapCotangent_surjective_of_comap_eq` and `Ideal.mapCotangent_ker_of_surjective` to the cotangent space of extensions. Because `Algebra.Extension.Cotangent` uses a type synonym to define the cotangent space of an extension, the results for `Ideal.mapCotangent` could not be used directly and needed to be restated in terms of `Algebra.Extension.Cotangent.map`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	32/0	Mathlib/RingTheory/Extension/Basic.lean	1	1	['github-actions']	nobody	1-20629 1 day ago	7-24660 7 days ago	7-24653 7 days
36934	Parcly-Taxel author:Parcly-Taxel	refactor: `Language` as a one-field structure	I came across definitional equality problems when trying to prove the following as part of a challenge from my PhD advisor: ```lean import Mathlib.Computability.Language variable {α : Type*} /-- `IsSingleton y` states that `y` consists of only one word, and that word is not empty. -/ def IsSingleton (y : Language α) : Prop := (∀ z ≤ y, z = y ∨ z = 0) ∧ y ≠ 1 ∧ y ≠ 0 lemma isSingleton_iff {y : Language α} : IsSingleton y ↔ ∃ w ≠ [], y = {w} := by sorry ``` This refactor resolves said defeq problems by making `Language` into a one-field structure with `toSet` and `ofSet`. --- - [ ] depends on: #37603	t-computability blocked-by-other-PR merge-conflict	179/110	Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/MyhillNerode.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean	7	22	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	1-20108 1 day ago	40-78936 40 days ago	11-26368 11 days
36971	Jun2M author:Jun2M	feat(Combinatorics/GraphLike): Change SimpleGraph files to use GraphLike	Per discussion at ([#graph theory > HasAdj](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/HasAdj/with/575843445)), this PR changes a swath of files in `SimpleGraph` folder to use `GraphLike` class and its APIs. --- - [ ] depends on: #36743 - [ ] depends on: #39047 - [ ] depends on: #36829 - [ ] depends on: #36756 - [ ] depends on: #39054 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics merge-conflict	2202/1597	Archive/Wiedijk100Theorems/Konigsberg.lean,Mathlib.lean,Mathlib/CategoryTheory/Sites/IsSheafFor.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/GraphLike/Walks/Basic.lean,Mathlib/Combinatorics/GraphLike/Walks/Simple.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Chord.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Counting.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Subwalks.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Traversal.lean,Mathlib/Data/Subtype.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/CastData.lean	43	7	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-20107 1 day ago	58-8125 58 days ago	0-533 8 minutes
37671	grunweg author:grunweg	feat: also check for norm_num in the flexible linter	Most other flexible tactics are terminal; dsimp is missing from this list (but perhaps less important in practice. --- - [x] depends on: #37880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter awaiting-author merge-conflict	31/1	Archive/Wiedijk100Theorems/AbelRuffini.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/InnerProductSpace/Convex.lean,Mathlib/Analysis/SpecialFunctions/ArithmeticGeometricMean.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Measure/IntegralCharFun.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Harmonic/EulerMascheroni.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Topology/UrysohnsLemma.lean	19	12	['SnirBroshi', 'github-actions', 'grunweg', 'joneugster', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-19983 1 day ago	31-58176 31 days ago	4-15280 4 days
39519	kbuzzard author:kbuzzard	perf: make WithVal.instRing irreducible	After the API has been made, there should no reason to unfold this instance. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	10/1	Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	4	3	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	1-18923 1 day ago	1-19663 1 day ago	0-132 2 minutes
38054	chrisflav author:chrisflav	feat(RingTheory): category of finite étale algebras over a separably closed field	We define the category of finite étale `R`-algebras for a ring `R` and show it is equivalent to `FintypeCat` if `R` is a separably closed field. From Pi1. --- - [ ] depends on: #38016 - [ ] depends on: #38409 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR merge-conflict	338/1	Mathlib.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Etale/Finite.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,Mathlib/RingTheory/TotallySplit.lean	10	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-18690 1 day ago	25-60847 25 days ago	0-82112 22 hours
38409	chrisflav author:chrisflav	feat(RingTheory): totally split algebras over a field	We show that for a totally split algebra over a field, the `k`-rational points are in bijection with the prime spectrum. We also show that an étale algebra over a separably closed field is totally split. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict	122/2	Mathlib/Algebra/Algebra/Pi.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/TotallySplit.lean	6	2	['github-actions', 'mathlib-merge-conflicts']	mariainesdff assignee:mariainesdff	1-18567 1 day ago	1-18568 1 day ago	24-42941 24 days
38830	Jun2M author:Jun2M	feat(Data/List): Nodup and head & getLast lemmas	Given a Nodup list: * If a prefix contains the last element, they are equal * If a suffix contains the first element, they are equal * If an infix contains the first element, it is a prefix * If an infix contains the last element, it is a suffix * If the first and the last element are the same, it is a singleton * `countP` is cardinality of the filter of `toFinset`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	29/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/List/Nodup.lean	2	7	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts']	nobody	1-18443 1 day ago	1-18444 1 day ago	15-71211 15 days
39287	xgenereux author:xgenereux	feat(Localization/AtPrime/Basic): upgrade `equivQuotMaximalIdeal` to an AlgEquiv	The definition [IsLocalization.AtPrime.equivQuotMaximalIdealPow](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Localization/AtPrime/Basic.html#IsLocalization.AtPrime.equivQuotMaximalIdealPow) was added in #36783. The case with `n = 1` is still important and interesting. I have upgraded it to an AlgEquiv using `equivQuotMaximalIdealPow`. This did break a few small things, because we need to bridge back to a `RingEquiv` in some places. I took the liberty to add some missing `apply` lemmas to ease fixing these proofs. Disclaimer: I used Claude to suggest the first shot and refined it from there. María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	45/68	Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean	3	2	['github-actions', 'mathlib-merge-conflicts', 'wwylele']	nobody	1-18311 1 day ago	1-18312 1 day ago	4-53165 4 days
39481	MichaelStollBayreuth author:MichaelStollBayreuth	chore: run `lake shake` iteratively and fix problems	This adds `-- shake: keep-all` to all modules under `Mathlib.Lean`, `Mathlib.Tactic` and `Mathlib.Util`. Then it goes through the remaining modules in topological order (according to the list in `MS_test/topsort3.txt`) and for each of them, runs `lake shake --force --only --fix`, followed by `lake build `. If there is no error, the changes are commited. Otherwise, the problems are fixed manually; then the changes are committed. This has been done for the first ~400 modules in the list. 38 of them required manual fixes; they are listed in `MS_test/after_shake_fixes.txt`. We note that the import stats bot claims that the number of imports actually increases in most files, which somehow runs counter expectations... Discussion: [#mathlib4 > shake without --add-public @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/shake.20without.20--add-public/near/595349216) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP tech debt large-import merge-conflict	9178/858	MS_test/after_shake_fixes.txt,MS_test/topsort3.txt,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/Divisibility/Hom.lean,Mathlib/Algebra/Divisibility/Prod.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Expr.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/FreeMonoid/Count.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Option.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/Action/Sum.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Commute/Basic.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/ModEq.lean,Mathlib/Algebra/Group/Nat/Hom.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/GroupWithZero/Opposite.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/GroupWithZero/Regular.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/NeZero.lean,Mathlib/Algebra/Notation.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Opposites.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Prime/Defs.lean,Mathlib/Algebra/Quotient.lean,Mathlib/Algebra/Regular/Basic.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Algebra/Ring/Basic.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/GrindInstances.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/InjSurj.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Int/Defs.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean	690	2	['github-actions', 'mathlib-merge-conflicts']	nobody	1-18308 1 day ago	unknown	0-0 0 seconds
39482	kbuzzard author:kbuzzard	(fixing up another PR because I'm impatient):	--- - [ ] depends on: #39467 [(in fact it _is_ #39467, I was just impatient] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra merge-conflict label:t-algebra$	24/10	Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/GrindInstances.lean	3	6	['github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-18307 1 day ago	2-24647 2 days ago	0-1 1 second
39202	FordUniver author:FordUniver	feat(Analysis/Calculus/Gradient): add toDual_gradient and companions	Add `toDual_gradient`, `toDual_gradientWithin`, and the composed variants `toDual_comp_gradient`, `toDual_comp_gradientWithin` — the natural inverse direction of the gradient's defining equation `∇ f x := (toDual 𝕜 F).symm (fderiv 𝕜 f x)`. These identify `(toDual 𝕜 F) (∇ f x)` with `fderiv 𝕜 f x` (and the `gradientWithin` and composed forms with the corresponding fderiv versions), making the Riesz isomorphism between the two derivative views explicit. The proofs of `DifferentiableAt.hasGradientAt` and `DifferentiableWithinAt.hasGradientWithinAt` in the same file are simplified to use them. --- Came up while formalizing the descent lemma for Lipschitz-smooth functions, where being able to switch between `LipschitzWith K (fderiv ℝ f)` and `LipschitzWith K (∇ f)` is helpful, which with this PR becomes `toDual_comp_gradient ▸ (toDual ℝ F).isometry.lipschitzWith_iff K`. Also slightly simplifies two call sites in mathlib.	maintainer-merge	20/5	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	5	['FordUniver', 'Komyyy', 'github-actions']	nobody	1-17454 1 day ago	7-51214 7 days ago	7-51371 7 days
36507	BryceT233 author:BryceT233	feat(RingTheory/MvPowerSeries): various equivalences for `MvPowerSeries`	This PR adds a number of equivalences related to power series rings and is patterned after `Mathlib/Algebra/MvPolynomial/Equiv.lean`. To be specific, it adds: * `MvPowerSeries.isEmptyEquiv` : The isomorphism between multivariable power series in no variables and the ground ring. * `MvPowerSeries.uniqueEquiv` : The isomorphism between multivariable power series in a single variable and power series over the ground ring. * `MvPowerSeries.mapEquiv`, `MvPowerSeries.mapAlgEquiv` : The isomorhism between multivariable power series induced by an isomorphism between the coefficient rings. * `MvPowerSeries.sumAlgEquiv` : The isomorphism between multivariable power series in a sum of two types, and multivariable power series in one of the types, with coefficients in multivariable power series in the other type. * `MvPowerSeries.commAlgEquiv` : The isomorphism between multivariable power series in variables `σ` of multivariable power series in variables `τ` and multivariable power series in variables `τ` of multivariable power series in variables `σ`. * `MvPowerSeries.optionEquivLeft` : The isomorphism between multivariable power series in `Option σ` and power series with coefficients in `MvPowerSeries σ R`. * `MvPowerSeries.optionEquivRight` : The isomorphism between multivariable power series in `Option σ` and multivariable power series in `σ` with coefficients in `PowerSeries R` * `MvPowerSeries.finSuccEquiv` : The isomorphism between multivariable power series in `Fin (n + 1)` and power series over multivariable power series in `Fin n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #35329 - [x] depends on: #36506	t-ring-theory large-import	598/4	Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean	2	26	['AntoineChambert-Loir', 'BryceT233', 'Thmoas-Guan', 'WenrongZou', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues']	mattrobball assignee:mattrobball	1-16556 1 day ago	9-8316 9 days ago	41-52140 41 days
37541	EtienneC30 author:EtienneC30	feat: another version of the cardinality of the difference	In mathlib there is `Set.ncard_diff` which states that `(t \ s).ncard = t.ncard - s.ncard` when `s ⊆ t` and `s` is finite. But one way to prove that `s` is finite is by showing that `t` is finite and using the `s ⊆ t` hypothesis, so this PR adds `Set.ncard_diff'` which assumes that `t` is finite instead of `s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	5/0	Mathlib/Data/Set/Card.lean	1	1	['github-actions']	nobody	1-13670 1 day ago	46-55428 46 days ago	46-55421 46 days
39505	dannyhe652 author:dannyhe652	feat(SimpleGraph): add Vizing's theorem for edge coloring	Hi! I'm a high school student interested in formulization of mathematics in Lean. Recently, I have worked on a project to formulize Vizing Theorem with Daniel Raggi from Cambridge University with AI assistance. In particular, we first drafted an outline for the proof, and built the proof using Claude Opus 4.5 and 4.6. The proof is optimized using Aristotle and finally reviewed by ourselves. We rewrote some parts of the code and some comments. The code now builds cleanly and we wish this code to be reviewed by Lean Community. I am aware that there are previous attempts, some being successful, on formulizing Vizing Theorem, including this one by Arohee https://github.com/aroheebhoja/vizing. However, I believe that no PR have been made. Our proof is not based on his proof, but it could be helpful for the community to review that project as well. I sincerely thank everyone who has time to verify and review our code. A summary of the project is as follows. Please contact me if there are any questions or problems. ## Summary This PR completes the proof of Vizing's theorem for edge coloring in simple graphs, proving that the chromatic index of any graph is either Δ (the maximum degree) or Δ + 1. ## Changes ### New files - `Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeColoring.lean` — Core definitions - `edgeColoring`: Type for line graph colorings - `edgeColorable`: Graph is edge-colorable with n colors - `chromaticIndex`: Chromatic index as ℕ - `Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain.lean` — Kempe Chain - Coloring observables: `incidentEdges`, `incidentColors`, `missingColors` - Kempe subgraph structure with bounded degree - `swapKempe`: Recolor edges in a connected component via color-swapping - `Mathlib/Combinatorics/SimpleGraph/Coloring/VizingFan.lean` — Vizing Fan Rotation - `IsFan`: Vizing fan structure with special color properties - Fan maximality and dichotomy on terminal vertices - `rotate_termA`: Extend coloring when a free color exists at both endpoints - `vizingAdjacencyLemma`: Main adjacency lemma for both cases - `Mathlib/Combinatorics/SimpleGraph/Coloring/VizingTheorem.lean` — Main theorems - `edge_eq_of_color_eq`: Proper edge colorings assign different colors to distinct edges sharing a vertex - `maxDegree_le_chromaticIndex`: χ'(G) ≥ Δ(G) - `chromaticIndex_bot`: Empty graph has chromatic index 0 - `vizingUpperBound_aux`: Inductive proof of upper bound on number of edge - `vizingTheorem`: χ'(G) ∈ {Δ(G), Δ(G) + 1} ### Modified files - `Mathlib.lean` — Added imports for the four new coloring modules ## Technical Approach Lower bound (χ'(G) ≥ Δ): - Edges incident to a max-degree vertex form a clique in the line graph - Clique number lower-bounds chromatic number Upper bound (χ'(G) ≤ Δ + 1): - Induction on the number of edges - Base case: empty graph colored with 0 colors - Inductive step: - If a free color exists at both endpoints of an edge, then extend directly - Otherwise: - Build a maximal fan from one endpoint - Apply dichotomy: either extend via Term-A (free color at both endpoints) or Term-B (Kempe swap) - Term-B uses a three-vertex connectivity argument to derive a contradiction, forcing the fan to extend ## Key Lemmas - `incidentEdges`, `incidentColors`, `missingColors`: Coloring observables at vertices - `kempeSubgraph`: Restricted subgraph of edges with two specific colors - `swapKempe`: Recolor via Kempe chain swapping - `IsFan.singleton`: Trivial fan always valid - `IsFan.length_le_card`: Fan length is bounded by vertex count - `IsFan.dichotomy`: Maximal fan satisfies Term-A or Term-B - `IsFan.rotate_termA`: Term-A case extends the coloring inductively - `vizingAdjacencyLemma`: Handles both cases for extending one edge - `vizingUpperBound_aux`: Framework for full inductive proof - `edge_eq_of_color_eq`: Distinctness of edges with same color ## Testing All four modules compile with no `sorry` nor errors or warnings. ## References * V. G. Vizing, On an estimate of the chromatic class of a p-graph, Diskret. Analiz. 3 (1964), 25–30. ## Co-authors Co-authored-by: Daniel Raggi Co-authored-by: Aristotle (Harmonic) Co-authored-by: Claude Opus 4.5 & 4.6 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	1915/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeColoring.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/KempeChain.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VizingFan.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/VizingTheorem.lean	5	3	['github-actions']	nobody	1-12885 1 day ago	1-17931 1 day ago	1-19303 1 day
35504	JoaBjo author:JoaBjo	feat(Probability/Distributions/Exponential): add MGF, moments, and memoryless property	feat(Probability/Distributions/Exponential): add MGF, moments, and memoryless property Add the main analytic results for the exponential distribution: - moment-generating function `mgf id (expMeasure r) t = r / (r - t)` for `t < r` - mean `∫ x, x ∂(expMeasure r) = r⁻¹` - variance `Var[id; expMeasure r] = r⁻¹ ^ 2` - `ℒp` membership for all `p` - tail probability `P(X > x) = exp (-(r * x))` - memoryless property `P(X > s + t \| X > s) = P(X > t)` The MGF is computed by reducing to the known improper integral `∫ exp(c * x)` on `Ioi`, and integrability is deduced by contradiction from the positive closed-form value. The mean and variance are computed via the Gamma function integral `∫₀^∞ x^(n-1) exp(-r x) dx = Γ(n) / rⁿ`. The memoryless property follows from the exponential identity `exp(-(r(s+t))) = exp(-rt) * exp(-rs)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	200/0	Mathlib/Probability/Distributions/Exponential.lean	1	6	['JoaBjo', 'Timeroot', 'github-actions']	EtienneC30 assignee:EtienneC30	1-12201 1 day ago	23-63790 23 days ago	39-62842 39 days
39501	jvanwinden author:jvanwinden	feat(MeasureTheory/Measure/Tight): tightness of marginals implies tightness on product space	This PR introduces `IsTightMeasureSet.prodMk`, which says that a set of measures on a product space is tight if both sets of marginals are tight. This is useful when proving weak compactness of probability measures on product spaces (via Prokhorov). The proof makes use of `isTightMeasureSet_iff_exists_isCompact_measure_compl_le` and then proceeds in the conventional way. I also tried to write a purely filter-theoretic proof, but did not really succeed and it was nowhere near as simple as the direct proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	19/0	Mathlib/MeasureTheory/Measure/Tight.lean	1	1	['github-actions']	EtienneC30 assignee:EtienneC30	1-12199 1 day ago	1-69573 1 day ago	1-69566 1 day
39503	jvanwinden author:jvanwinden	feat(Probability): add API for infinite product measures	This PR introduces two lemmas which serve as API for infinite product measures: - `ProbabilityTheory.Measure.hasLaw_infinitePi_eval`: the `i`-th coordinate on an infinite product measure has law `μ i` - `ProbabilityTheory.Measure.map_infinitePi_infinitePi_of_inj`: when `f : ι → ι` is injective, then the pushforward of the coordinates rearranged according to `f` (i.e., the law of `fun ω i ↦ ω (f i)` is the same as the infinite product of the rearranged laws. The second lemma bears some resemblance to `infinitePi_map_piCongrLeft`, but does not require `f` to be a bijection and probably is easier to work with in practice. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	14/0	Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/ProductMeasure.lean	2	2	['CoolRmal', 'github-actions']	EtienneC30 assignee:EtienneC30	1-12198 1 day ago	1-65348 1 day ago	1-65371 1 day
39369	pd4st8hb95-hub author:pd4st8hb95-hub	feat: add basic fuzzy set definitions	This PR adds a minimal `FuzzySet` API in `Mathlib/Order/FuzzySet`. A fuzzy set is represented as an abbreviation: `FuzzySet α L := α → L` The file provides basic definitions and lemmas: - `degree` - `support` - `core` - `weakCut` - `strongCut` - membership simp lemmas - extensionality - basic monotonicity lemmas for weak and strong cuts This PR intentionally does not add complement, union/intersection-specific API, normal or convex fuzzy sets, fuzzy relations, or advanced fuzzy set theory. Validation: - `lake build Mathlib.Order.FuzzySet` - `#lint only docBlame docBlameThm` Feedback on whether `Mathlib/Order/FuzzySet.lean` is the right location for this minimal API would be appreciated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	169/0	Mathlib.lean,Mathlib/Order/FuzzySet.lean	2	6	['github-actions', 'grunweg', 'pd4st8hb95-hub', 'wwylele']	nobody	1-10169 1 day ago	2-53799 2 days ago	2-54152 2 days
37521	jessealama author:jessealama	feat(Data/Part): add Part.bind_eq_some_iff	Add `Part.bind_eq_some_iff`, the `Part` analogue of `Option.bind_eq_some_iff`. Noticed this small gap while working on some equivalence proofs with partial functions.	t-data	6/0	Mathlib/Data/Part.lean	1	6	['github-actions', 'jessealama', 'joneugster', 'vihdzp']	joneugster assignee:joneugster	1-8099 1 day ago	1-8130 1 day ago	43-51356 43 days
37627	Thmoas-Guan author:Thmoas-Guan	refactor(RingTheory/Ideal/Height): private `Ideal.primeHeight`	--- - [ ] depends on: #38029 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	183/136	Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/KrullDimension/PID.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mbkybky']	nobody	1-6762 1 day ago	1-6835 1 day ago	5-61075 5 days
28683	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): regular local ring is domain	In this PR, we proved for a regular local ring `R`, 1 : for a finite set `S` in the maximal Ideal of `R`, it can be extended to a regular system of parameters iff they are linear independent in the cotangent space iff `R/span S` is regular local ring of dimesion `dim R - \|S\|` 2 : is domain 3 : regular system of parameter form regular sequence. --- - [x] depends on: #28682 - [ ] depends on: #37627 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	515/136	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean	9	57	['Raph-DG', 'Thmoas-Guan', 'WenrongZou', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'mbkybky']	nobody	1-6747 1 day ago	10-76098 10 days ago	1-49980 1 day
26245	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): cohen macaulay local ring is catenary	We prove Cohen Macaulay local ring is catenary. Following Theorem 31, Chater 6, _Commutative Algebra_, Matsumura --- - [ ] depends on: #26218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	2300/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	15	18	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-6503 1 day ago	331-73686 331 days ago	0-18 18 seconds
26957	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): unmixed thm of Cohen-Macaulay ring	In this PR we proved for a (comm)ring `R`, `R` is Cohen-Macaulay ring iff the unmixed theorem holds (for every ideal `I` of height `r` generated by `r` elements, all associated primes of `R/I` have height `r` ) --- - [ ] depends on: #26245 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR large-import label:t-algebra$	2479/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/CohenMacaulay/Unmixed.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	16	16	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-5096 1 day ago	312-67481 312 days ago	0-229 3 minutes
29533	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): maximal Cohen Macaulay module	In this PR, we defined the concept of maximal Cohen Macaulay module, and proved that finitely generated maximal Cohen Macaulay module over regular local ring is free. --- - [ ] depends on: #28683 - [ ] depends on: #26218 - [ ] depends on: #38698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra large-import label:t-algebra$	2488/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,docs/references.bib	20	15	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-4869 1 day ago	250-10594 250 days ago	0-88 1 minute
29557	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): finite projective dimension of regular	In this PR, we proved every finitely generated module over regular local ring has finite projective dimension. With this and Auslander Buchsbaum theorem, we can obtain the global dimension of regular local ring is equal to its krull dimension. --- - [ ] depends on: #29533 - [ ] depends on: #26215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra large-import label:t-algebra$	2930/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,docs/references.bib	22	16	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-4860 1 day ago	249-51974 249 days ago	0-1929 32 minutes
36739	mbkybky author:mbkybky	feat(RingTheory): UFD criteria via height `1` prime ideals and localization	We prove the following UFD criteria via height `1` prime ideals and localization: 1. Let `R` be a Noetherian domain. Then `R` is a UFD if and only if every height `1` prime ideal is principal. 2. Let `R` be a Noetherian domain, `x ∈ R` be a prime element. If `Rₓ` is a UFD, then `R` is also a UFD. - [ ] depends on: #37627 - [x] depends on: #38933 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	375/138	Mathlib.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/UFD.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Localization.lean	9	20	['chrisflav', 'github-actions', 'mathlib-dependent-issues', 'mbkybky', 'tb65536']	chrisflav assignee:chrisflav	1-3560 1 day ago	1-3561 1 day ago	60-72654 60 days
29534	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): global dimension of regular local ring	In this PR, we proved the global dimension of regular local ring is equal to its krull dimension via Auslander Buchsbaum theorem. --- - [ ] depends on: #29557 - [ ] depends on: #26215 - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra large-import label:t-algebra$	3245/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,docs/references.bib	25	20	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-3345 1 day ago	250-8351 250 days ago	0-2082 34 minutes
29699	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): global dimension of regular ring	In this PR, we proved that the global (homological dimension) of regular ring is equal to its krull dimension. --- - [ ] depends on: #28684 - [ ] depends on: #31999 - [ ] depends on: #29534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra large-import label:t-algebra$	3356/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,docs/references.bib	25	22	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-3331 1 day ago	244-82864 244 days ago	0-632 10 minutes
29703	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): Hilbert's Syzygy theorem (projective version)	In this PR, we proved for field `k`, `MvPolynomial (Fin n) k` has global dimension `n`. --- - [ ] depends on: #29701 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory large-import	3514/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Polynomial.lean,Mathlib/RingTheory/RegularLocalRing/Syzygy.lean,docs/references.bib	27	23	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-2856 1 day ago	244-71882 244 days ago	0-2475 41 minutes
26479	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Complex/CauchyIntegral): Cauchy–Goursat for Unbounded Rectangles	In this PR, we prove versions of the Cauchy-Goursat theorem where the contours in question are rectangular and unbounded (ie, where the contours look like the $\bigsqcup$ symbol). I am not sure if I have formalised these in the best way, or if `Analysis.Complex.CauchyIntegral` is the best place for them (it might be prudent to reorganise the file into multiple files at some point), but I believe this is a useful result. Suggestions welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis sphere-packing	219/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	7	['github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-merge-conflict-bot', 'thefundamentaltheor3m', 'wwylele']	urkud assignee:urkud	0-86277 23 hours ago	0-86277 23 hours ago	35-11092 35 days
34466	Komyyy author:Komyyy	chore: modulize tests (N/N)	--- Privately imports are intentional. I manually modulize each test so that the purpose of the tests is not lost by modulizing. - [x] Await the release of leanprover/lean4#12198 - [x] depends on: #34970 - [x] depends on: #35288 - [x] depends on: #36882 - [x] depends on: #36981 - [x] depends on: #37654 - [ ] Await the release of leanprover/lean4#13329 - [x] depends on: #37820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	310/63	MathlibTest/AssertImported.lean,MathlibTest/BinaryRec.lean,MathlibTest/Bound/attribute.lean,MathlibTest/Bound/bound.lean,MathlibTest/CategoryTheory/Bicategory/Normalize.lean,MathlibTest/CategoryTheory/Elementwise.lean,MathlibTest/CategoryTheory/Monoidal/Normalize.lean,MathlibTest/Clean.lean,MathlibTest/DFinsuppMultiLinear.lean,MathlibTest/GRewrite.lean,MathlibTest/LibrarySuggestions/sineQuaNon.lean,MathlibTest/LongFile.lean,MathlibTest/Nat/log.lean,MathlibTest/Perm.lean,MathlibTest/Polynomial.lean,MathlibTest/Quaternion.lean,MathlibTest/RefinedDiscrTree.lean,MathlibTest/antidiagonal.lean,MathlibTest/dfinsupp_notation.lean,MathlibTest/fast_instance.lean,MathlibTest/grind/ac.lean,MathlibTest/grind/cc.lean,MathlibTest/grind/field.lean,MathlibTest/grind/field_instance.lean,MathlibTest/grind/grobner.lean,MathlibTest/grind/linarith.lean,MathlibTest/grind/lint.lean,MathlibTest/grind/natCast_instance.lean,MathlibTest/grind/ordered_ring.lean,MathlibTest/grind/pairwise_disjoint.lean,MathlibTest/grind/panic.lean,MathlibTest/grind/ring.lean,MathlibTest/grind/set.lean,MathlibTest/grind/trig.lean,MathlibTest/hintAll.lean,MathlibTest/slow_simp.lean,MathlibTest/solve_by_elim/basic.lean,MathlibTest/solve_by_elim/dummy_label_attr.lean,MathlibTest/solve_by_elim/instances.lean,MathlibTest/vec_notation.lean,check_modulized_tests.lean,not_modulized_modules.txt	42	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-85892 23 hours ago	unknown	0-0 0 seconds
29701	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): polynomial over regular ring	In this PR, we proved that polynomial over regular ring is regular. --- - [x] depends on: #37627 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	309/136	Mathlib.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/RegularLocalRing/Polynomial.lean	6	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	0-84339 23 hours ago	0-84340 23 hours ago	24-79765 24 days
39517	jvanwinden author:jvanwinden	feat(MeasureTheory/Function): ae convergence implies convergence in distribution	This PR introduces a theorem which concludes convergence in distribution from almost everywhere convergence. Previously, this could be done by chaining [`tendstoInMeasure_of_tendsto_ae`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/ConvergenceInMeasure.html#MeasureTheory.tendstoInMeasure_of_tendsto_ae) and [`TendstoInMeasure.tendstoInDistribution`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/ConvergenceInDistribution.html#MeasureTheory.TendstoInMeasure.tendstoInDistribution). However, this is not a good way to to it since the second lemma requires a `SeminormedAddCommGroup E` instance (which is not needed for the statement to hold). Thus, we instead give a direct short proof which relies on dominated convergence. Sidenote: I believe [`TendstoInMeasure.tendstoInDistribution`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/ConvergenceInDistribution.html#MeasureTheory.TendstoInMeasure.tendstoInDistribution) should be rewritten at some point to require only a metric space (or maybe only uniform space) structure. However, even if this was done, the theorem of this PR provides the value of relying only on `TopologicalSpace E`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	19/0	Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean	1	5	['CoolRmal', 'github-actions', 'jvanwinden']	EtienneC30 assignee:EtienneC30	0-84169 23 hours ago	1-32157 1 day ago	1-32150 1 day
39183	yuanyi-350 author:yuanyi-350	refactor(Analysis): golf `Mathlib/Analysis/Complex/Exponential`	- shortens the reindexing step in `norm_exp_sub_sum_le_norm_mul_exp` by switching from `sum_bij` to `sum_Ico_eq_sum_range` with `simp` Extracted from #37968 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex t-analysis LLM-generated maintainer-merge	8/23	Mathlib/Analysis/Complex/Exponential.lean	1	4	['Komyyy', 'github-actions', 'yuanyi-350']	urkud assignee:urkud	0-83770 23 hours ago	0-83958 23 hours ago	7-65559 7 days
37940	BryceT233 author:BryceT233	feat(Algebra/Category): the category of local extensions over a fixed field	This is an attempt to design the definitions of base category [[Stacks, 06GC]](https://stacks.math.columbia.edu/tag/06GC) and complete base category in deformation theory. The approach we take is to first introduce a larger category of local extensions with a fixed field, then define base category and complete base category to be full subcategories of this larger category via `ObjectProperty`. To be specific: * In `Defs.lean`, we define `LocExtCat` and `LocExtCat.Hom` to be the type of objects and morphisms in the category. * In `Basic.lean`, we add the basic construction `ofQuot` and `toOfQuot`, which is the quotient of an object in `LocExtCat` by a proper Ideal. Then we use them to define `infinitesimal` and `specialFiber` for an object in `LocExtCat`. * In `Cotangent.lean`, we prove the exactness of the conormal sequence for the special fiber. * In `BaseCat.lean`, we define `BaseCat` to be the full subcategory of `LocExtCat` consisting of objects whose underlying rings are Artinian, and introduce the type class of a small extension for morphisms in `BaseCat`. We show that any surjective morphism in `BaseCat` can be factored into a finite composition of small extensions [[Stacks, 06GE]](https://stacks.math.columbia.edu/tag/06GE) This PR is intended to showcase the overall design and architecture, I will split this into smaller PRs once the community reaches a consensus on the design choices. --- - [x] depends on: #36657 - [ ] depends on: #37008 - [ ] depends on: #39223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-algebra WIP label:t-algebra$	1640/0	Mathlib.lean,Mathlib/Algebra/Category/LocExtCat/BaseCat.lean,Mathlib/Algebra/Category/LocExtCat/Basic.lean,Mathlib/Algebra/Category/LocExtCat/Cotangent.lean,Mathlib/Algebra/Category/LocExtCat/Defs.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/Pullback.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean	12	32	['BryceT233', 'Deicyde', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues']	nobody	0-81679 22 hours ago	31-62919 31 days ago	2-38364 2 days
39000	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): Sturm bound for finite-index subgroups	Sturm bound for arithmetic subgroups of `GL(2, ℝ)` commensurable with `SL(2, ℤ)`: a modular form whose q-expansion at the cusp `∞` has order strictly greater than `k · [𝒮ℒ : 𝒢] / 12` is identically zero. Lifted from the level-one case (#38993) via the modular norm map. Final piece of a 5-PR split; all helper machinery is split out into the dependencies below. ## Main results - `ModularForm.sturm_bound_finiteIndex`: order-based Sturm bound for arithmetic subgroups. - `ModularForm.sturm_bound_finiteIndex_SL2Z`: specialisation to finite-index subgroups of `SL(2, ℤ)`. - `finiteDimensional_modularForm_finiteIndex`: a `Module.Finite ℂ (ModularForm 𝒢 k)` instance. - [ ] depends on: #39083 (helpers in Order, Periodic, QExpansion, NormTrace) - [ ] depends on: #39086 (galoisProd machinery) - [ ] depends on: #39087 (integer cusp width + T-pow slash action) - [ ] depends on: #39088 (norm map decomposition) - [ ] depends on: #38993 (level-one Sturm bound) This PR was done with the help of Claude Code.	t-number-theory blocked-by-other-PR LLM-generated	860/21	Mathlib.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/NormTrace.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/NumberTheory/ModularForms/SturmBound.lean	10	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-81151 22 hours ago	unknown	0-0 0 seconds
39086	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): Galois product machinery	Adds the `galoisProd` construction and its analytic / order properties to `NormTrace.lean`. Used in the finite-index Sturm bound proof. ## Main additions - `galoisProd N f τ = ∏ j < N, f (j/N +ᵥ τ)`. - `galoisProd_periodic_one`, `galoisProd_mdiff`, `galoisProd_isBoundedAtImInfty`. - `cuspFunction_one_galoisProd_pow_eq`: pulled back through `qParam`, `galoisProd` is `(cuspFunction f)^N`. - `qExpansion_one_galoisProd_order_eq_qExpansion_self_order`: `galoisProd N f` and `f` have the same q-expansion order. - [ ] depends on: #39083 This PR was done with the help of Claude Code.	blocked-by-other-PR LLM-generated	363/21	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/NormTrace.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-80933 22 hours ago	unknown	0-0 0 seconds
39087	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): integer cusp width and T-power slash action	Adds the integer cusp width and `T^j` slash-action computation, both needed by the finite-index Sturm bound. ## Main additions - `Mathlib/NumberTheory/ModularForms/Cusps.lean`: - `Subgroup.integerCuspWidth 𝒢`: the smallest positive integer in `𝒢.strictPeriods`. - `integerCuspWidth_pos`, `integerCuspWidth_mem_strictPeriods`, `T_zpow_integerCuspWidth_mem`, `quotient_T_pow_injective_integerCuspWidth`, `integerCuspWidth_eq_nat_mul_strictWidthInfty`. - `Mathlib/NumberTheory/ModularForms/Identities.lean`: - `slash_T_zpow_apply_general`: `(g ∣[k] T^j) τ = g (j +ᵥ τ)`. - [ ] depends on: #39083 This PR was done with the help of Claude Code.	blocked-by-other-PR LLM-generated	346/21	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/NormTrace.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	8	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-80930 22 hours ago	unknown	0-0 0 seconds
39088	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): norm map decomposition for Sturm bound	Decomposes the modular norm map `ModularForm.norm 𝒮ℒ f` as `galoisProd N f` times a "rest" factor analytic at the cusp, and shows the resulting q-expansion order at width 1 is at least the order of `f` at its natural cusp width. Used in the finite-index Sturm bound proof. ## Main additions - `quotientFunc_T_pow_apply`, `image_T_pow_invariant_under_T_mul/_smul`, `image_T_pow_smul_inv_iff`: action of `T^j` on the cosets used in the norm map. - `prod_quotientFunc_filter_image_one_vadd`: regrouping of the norm-map product. - `analyticAt_cuspFunction_one_norm_rest`: the rest factor is analytic at `0`. - [ ] depends on: #39086 (galoisProd machinery) - [ ] depends on: #39087 (integer cusp width + T-pow slash action) This PR was done with the help of Claude Code.	blocked-by-other-PR LLM-generated	723/21	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/NormTrace.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	8	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-80929 22 hours ago	unknown	0-0 0 seconds
39083	CBirkbeck author:CBirkbeck	feat(Mathlib): preparations for finite-index Sturm bound	Stand-alone helpers extracted from #39000 (Sturm bound for finite-index subgroups). First of a 5-PR split. ## Main additions - `Mathlib/Analysis/Analytic/Order.lean`: `analyticOrderAt_prod`, `analyticOrderAt_comp_pow_zero`. - `Mathlib/Analysis/Complex/Periodic.lean`: `Periodic.qParam_sub`. - `Mathlib/NumberTheory/ModularForms/QExpansion.lean`: `qExpansion_order_eq_analyticOrderAt_cuspFunction`, `qExpansion_order_le_qExpansion_nat_mul_order`. - `Mathlib/NumberTheory/ModularForms/NormTrace.lean`: `quotientFunc_mdiff`, `quotientFunc_isBoundedAtImInfty`. This PR was done with the help of Claude Code.	LLM-generated	195/21	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/NormTrace.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	6	3	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	0-80925 22 hours ago	10-51061 10 days ago	0-1178 19 minutes
39439	NoahW314 author:NoahW314	feat: add `LinearMap.restrictScalars_mul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory maintainer-merge	11/5	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean	3	9	['NoahW314', 'eric-wieser', 'github-actions', 'leanprover-radar', 'tb65536']	tb65536 assignee:tb65536	0-79203 22 hours ago	2-18115 2 days ago	3-24969 3 days
33369	Thmoas-Guan author:Thmoas-Guan	feat(Homology): `Ext` commute with flat base change	In this PR, using the linear map `Ext(M,N) => Ext(F(M), F(N))` when `F` is exact functor, we prove that `Ext` commute with flat base change if the ring is noetherian and two modules are finitely generated, stated using `IsBaseChange`. --- - [x] depends on: #31046 - [ ] depends on: #31222 - [x] depends on: #32316 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-topology	432/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Module/FinitePresentation.lean	3	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-78631 21 hours ago	140-60149 140 days ago	0-1554 25 minutes
29796	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): regular of finite global dimension	In this PR, we proved the other half of Auslander-Buchsbaum-Serre criterion, which states that a local ring is regular if it has finite global dimension, with results in #29557, we can obtain the full theorem. More APIs would be developed based on the two. --- - [ ] depends on: #26215 - [ ] depends on: #26217 - [ ] depends on: #29558 - [ ] depends on: #28683 - [ ] depends on: #38698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory large-import	2638/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,docs/references.bib	23	18	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-78242 21 hours ago	242-1676 242 days ago	0-80 1 minute
29802	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/RingTheory): Auslander–Buchsbaum–Serre criterion and its corollaries	In this PR, we proved that: 1: The full version of Auslander–Buchsbaum–Serre criterion 2: Localization of regular local ring is regular 3: Global dimension finite implies regular (doesn't need local) 4: Regular ring only need to be verified at maximal ideals. --- - [ ] depends on: #29534 - [ ] depends on: #29699 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory large-import	3888/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Localization.lean,docs/references.bib	27	23	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-78224 21 hours ago	241-73507 241 days ago	0-458 7 minutes
39133	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/ModuleCat): exactness of restrictScalars for general universe level	Currently exactness of `ModuleCat.restrictScalars` is synth via being adjoint functor, however this needs the universe level to be some `max u v` where `u` is the universe level of the ring. Here we provide exactness of restrictScalars for general universe level using it preserves short exact sequence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	46/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean	2	1	['github-actions']	nobody	0-78116 21 hours ago	9-1083 9 days ago	9-1076 9 days
31768	Thmoas-Guan author:Thmoas-Guan	feat(Homology): `Ext` under restrict scalars by `RingEquiv`	In this PR, we proved that `Ext` commute with ulift functor in `ModuleCat`. Further more, we provided compatibility with (semi-)linear equiv of general universe. --- - [ ] depends on: #39133 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory blocked-by-other-PR label:t-algebra$	142/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean	4	31	['Thmoas-Guan', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	0-78102 21 hours ago	9-502 9 days ago	21-43952 21 days
31851	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/Homology): Injective dimension in linear equiv	In this PR, we proved that injective dimension is preserved under (semi-) linear equiv for general universe level. --- - [ ] depends on: #31768 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	376/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean	7	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-78088 21 hours ago	179-45847 179 days ago	0-8108 2 hours
38086	dagurtomas author:dagurtomas	feat(CategoryTheory): composition of profunctors	--- - [x] depends on: #38085 - [x] depends on: #38382 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	497/0	Mathlib.lean,Mathlib/CategoryTheory/Profunctor/Bicategory.lean,Mathlib/CategoryTheory/Profunctor/Comp.lean,Mathlib/Logic/Relation.lean	4	9	['github-actions', 'mathlib-dependent-issues', 'robin-carlier']	robin-carlier assignee:robin-carlier	0-77863 21 hours ago	0-77863 21 hours ago	5-62245 5 days
34279	grunweg author:grunweg	chore: use `to_fun` to auto-generate more duplicate lemmas	We use the new functionality of `to_fun` from #34257 to remove a few more duplicate lemmas. --- - [x] depends on: #34257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	56/160	Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean	4	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	0-77860 21 hours ago	1-22764 1 day ago	1-23198 1 day
36910	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory): 4 and 5 lemmas for ComposableArrows n	Adds versions of the 4 and 5 lemmas for morphisms in `ComposableArrows n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory maintainer-merge	83/2	Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Four.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean	3	32	['Brian-Nugent', 'dagurtomas', 'erdOne', 'github-actions', 'robin-carlier']	adamtopaz assignee:adamtopaz	0-77562 21 hours ago	5-27092 5 days ago	40-74990 40 days
36439	xgenereux author:xgenereux	feat(Algebra/Adjoin): CoeDep instances for Algebra.adjoin on singletons	It is a common occurrence that I need to consider an element `x` or some polynomial evaluated in `x`, `p.eval x` as an element of `Algebra.adjoin R {x}`. This makes it so that we can write - `(x : adjoin R {x})` instead of `⟨x, self_mem_adjoin_singleton A x⟩` - `(p.eval x : adjoin R {x})` instead of `⟨p.aeval x, aeval_mem_adjoin_singleton A x⟩` This is particularly useful when we need to write the type anyways, so that we need not to write `(⟨p.aeval x, aeval_mem_adjoin_singleton A x⟩ : adjoin R {x})` anymore. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	33/3	Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/RingTheory/Adjoin/Polynomial/Basic.lean	2	19	['Vierkantor', 'chrisflav', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'riccardobrasca', 'xgenereux']	riccardobrasca assignee:riccardobrasca	0-75190 20 hours ago	20-49497 20 days ago	56-399 56 days
39434	Paul-Lez author:Paul-Lez	feat: add Faa Di Bruno helper results	WIP This PR adds a few helper results for the Faa Di Bruno theorem - the motivation for adding those is work I've been doing at the ICERM analysis workshop on defining jet bundles, which requires proving some vanishing results for higher order derivatives. ~~One question for review: currently a few of the results are stated for `(s ∩ u)` - do people think this is useful? Or would it be worth just stating the results for `u` directly?~~ Actually after a bit of thinking I'm not super happy with this approach, so I'm going to remove these. There's also one or two other lemmas I'd like to add before someone takes a look at these! AI usage: I used codex for part of the work on this (stating some of the results, based on some precise prompting I gave), and checked the content carefully and spent some time golfing proofs and so on (all of this before the first commit). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	79/1	Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean	1	1	['github-actions']	nobody	0-74799 20 hours ago	2-31720 2 days ago	0-84707 23 hours
39109	mbkybky author:mbkybky	feat(RingTheory/LocalProperties): `Module.FinitePresentation` is a local property	We show that if there exists a set `{ r }` of `R` such that `Mᵣ` is a finitely presented `Rᵣ`-module for each `r`, then `M` is a finitely presented `R`-module. Co-authored-by: Sihan Su @su00000 Co-authored-by: Yi Song @syur2 From the [Local Properties of Modules](https://github.com/mbkybky/module_localProperties) project. - [x] depends on: #39112 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	99/10	Mathlib.lean,Mathlib/RingTheory/LocalProperties/FinitePresentation.lean,Mathlib/RingTheory/Localization/Finiteness.lean	3	6	['github-actions', 'mathlib-dependent-issues', 'robin-carlier']	nobody	0-74778 20 hours ago	7-50592 7 days ago	9-34931 9 days
31884	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): definition of Gorenstein local ring	In this PR, we gave basic definition of Gorenstein local ring and Gorestein ring and prove that they are stable under ring equiv. --- - [ ] depends on: #31851 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory	449/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RingTheory/Gorenstein/Defs.lean	8	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-74629 20 hours ago	178-62785 178 days ago	0-2574 42 minutes
32035	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): localization of Gorenstein local ring	In this PR, we proved that localization of Gorenstein local ring at prime is again Gorenstein. --- - [ ] depends on: #31884 - [ ] depends on: #32033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory	553/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Gorenstein/Localization.lean	9	12	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-74611 20 hours ago	175-73581 175 days ago	0-862 14 minutes
32098	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): injective dimension of quotSMulTop	In this PR, we proved for finitely generated module `M` over noetherian ring `R`, if `x` in maximal ideal being both `R`-regular and `M`-regular, `injdim_R (M/xM) + 1 = injdim_{R/(x)} (M)`. --- - [ ] depends on: #32058 - [ ] depends on: #39133 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory	663/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean	5	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-74590 20 hours ago	174-53778 174 days ago	0-2059 34 minutes
35122	Marygold-Dusk author:Marygold-Dusk	feat: define C^n submersions	This PR defines submersions between C^n manifolds. In the infinite-dimensional setting, submersions are defined via local normal forms rather than surjectivity of the mfderiv. A map f is a submersion at x if, in suitable charts around x and f x, it has the form (u, v) ↦ u after identifying the model space with a product. We prove a few basic properties: - being a submersion is a local property, - products of submersions are submersions, - the set of submersed points is open Future PRs will prove that submersions are C^n and deduce equivalence with the standard definition in finite dimensions. From the path towards the regular value theorem. This file was developed under the supervision of Michael Rothgang. Co-authored-by: Michael Rothgang --- Most of the design is analogues to immersions.	t-differential-geometry new-contributor	642/0	Mathlib.lean,Mathlib/Geometry/Manifold/Submersion.lean,docs/references.bib	3	54	['Marygold-Dusk', 'chrisflav', 'github-actions', 'grunweg']	PatrickMassot and grunweg assignee:grunweg assignee:PatrickMassot	0-74465 20 hours ago	0-74465 20 hours ago	45-8592 45 days
36888	CoolRmal author:CoolRmal	feat: generalize some lemmas by using conditional Jensen	This PR includes two possible ways of generalizing `integral_abs_condExp_le`: 1. Replace absolute values with norms. 2. Consider absolute values defined on a lattice with a solid norm. We also prove that if a function is in Lp then its conditional expectation is also in Lp. In order to prove these results, some of the lemmas about essSup are generalized to conditionally complete lattices. Created with the help of Codex. --- - [x] depends on: #36877 - [x] depends on: #39104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	215/127	Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/Probability/CondVar.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Probability/Martingale/Centering.lean	6	20	['CoolRmal', 'EtienneC30', 'RemyDegenne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	EtienneC30 assignee:EtienneC30	0-74186 20 hours ago	0-74186 20 hours ago	6-24577 6 days
39518	abeldonate author:abeldonate	feat(RingTheory/LocalProperties/Projective): Projective Module theorem	Theorem: R Noetherian, M finitely generated R-Mod. Then: M projective iff M_m free for all m maximal	t-ring-theory new-contributor large-import awaiting-author	21/0	Mathlib/RingTheory/LocalProperties/Projective.lean	1	5	['github-actions', 'mbkybky']	nobody	0-74045 20 hours ago	0-74045 20 hours ago	0-40435 11 hours
39447	Paul-Lez author:Paul-Lez	feat: define map from PowerSeries to FormalMultilinearSeries	WIP: I'm not fully happy with the design yet and would like to change a few things around before anyone takes a look for review! This PR defines a map from `PowerSeries R` to `FormalMultilinearSeries R A A`, and proves that this map preserves addition and composition. Co-authored-by: Xavier Genereux --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory	181/0	Mathlib/RingTheory/PowerSeries/ToFormalMultilinearSeries.lean	1	1	['github-actions']	nobody	0-72465 20 hours ago	3-20760 3 days ago	0-23 23 seconds
35316	mkaratarakis author:mkaratarakis	feat: lemmas for the analytic part of the proof of the Gelfond–Schneider theorem (Part 4/5)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import awaiting-author	84/1	Mathlib/Analysis/Analytic/Order.lean	1	32	['MichaelStollBayreuth', 'SnirBroshi', 'github-actions', 'kebekus', 'mathlib-dependent-issues', 'mkaratarakis']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-72090 20 hours ago	0-72090 20 hours ago	34-67422 34 days
39475	ADedecker author:ADedecker	feat: define LinearMap.QuasiInverse	If the name "QuasiInverse" is considered too vague, I am open to suggestions. This was written by @PatrickMassot and @CoolRmal at the May 2026 ICERM workshop as part of the project on Fredholm operators. --- - [ ] depends on: #39468 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	347/8	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/FiniteRankLinearMap.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-68691 19 hours ago	2-31392 2 days ago	0-1118 18 minutes
37624	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Maps): add theorems about composition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	32/5	Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	11	['IvanRenison', 'YaelDillies', 'github-actions']	nobody	0-67101 18 hours ago	2-35290 2 days ago	43-72077 43 days
39385	ocfnash author:ocfnash	chore: define `Complex.UnitDisc` using `Subsemigroup.unitBall`	The motivation is to have some local consistency between the definitions of `Circle` and `Complex.UnitDisc`. At the moment, there is a mild style inconsistency since `Circle` uses `Submonoid.unitSphere` whereas `Complex.UnitDisc` uses a raw `Metric.ball`. The background is that we are about to add `Complex.closedUnitDisc` and so the question arose about which pattern to follow. I decided that we should follow `Circle` and bring `Complex.UnitDisc` in line. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy t-analysis	5/1	Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Normed/Field/UnitBall.lean	2	6	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	0-66780 18 hours ago	4-34675 4 days ago	4-36636 4 days
37010	pion2024 author:pion2024	`Sl2`update: add theorem `finrank_weightSpace_eq_one_of_isIrreducible`	# Background: I am a 2nd year undergrad student in mathematics currently self-teaching Lie algebra and representation theory. Before starting the formalization, I searched for related keywords on Zulip and in the GitHub issues and commits. As far as I could tell, there were no existing results or ongoing attempts before I started. All feedback is welcome. Even a quick check on the statement design/an idea on the generalization (cf Limitations below) would be incredibly helpful. # Overview In this PR, I added the new section `IsAlgClosedIrreducible` which formalizes the well-known theorem `finrank_weightSpace_eq_one_of_isIrreducible` for the Lie algebra $\mathfrak{sl}_2$ step by step. It proves that for a finite-dimensional irreducible representation of $\mathfrak{sl}_2$ over an algebraically closed field $K$ of characteristic zero, every non-trivial weight space has a dimension of exactly 1. # Formalization Structure : Instead of relying on explicit finite sums (`Finset.sum`) and manipulating coefficients, I heavily leverage Mathlib's abstractions in Submodule Lattice Theory and Coordinate-free Linear Algebra. The formalization proceeds in the following logic: 1. Existence of a Primitive Vector (`exists_primitiveVector`): I construct a primitive (highest-weight) vector by showing that repeated applications of the raising operator $e$ must eventually yield zero due to the finite-dimensionality of $M$ and the linear independence of eigenvectors corresponding to distinct eigenvalues. 2. The span of $f$-Tower as a Lie Submodule equals to the whole space (`fTowerLieSubmodule_eq_top`): I define the $f$-tower submodule as the $K$-span of $\{f^k m \mid k \in \mathbb{N}\}$. By proving its closure under the action of $f, h$, and $e$, I establish it as a Lie submodule. Since $M$ is irreducible, this submodule must be the entire space ($\top$). 3. Submodule Lattice Operations (`exists_mem_fTower_of_weightSpace_ne_bot`): To prove that every weight in $M$ is of the form $\mu_0 - 2k$, I use lattice operations (iSup, inf, and Disjoint) to avoid element-wise tracking. Since the $f$-tower spans $M$, the supremum of its weight spaces is $\top$. By leveraging `Module.End.eigenspaces_iSupIndep`, I show that any arbitrary non-trivial weight space would have a trivial intersection with $\top$ if its weight didn't belong to the sequence, yielding a contradiction. 4. Dimension Calculation via Basis Equivalence (`finrank_weightSpace_eq_one_of_isIrreducible`): Finally, I construct a basis from the non-zero elements of the $f$-tower. To show the weight space is 1-dimensional, I use `Basis.equivFun` to compare coefficients algebraically. This avoids heavy manual indexing and index-shifting, proving that any vector in the weight space $\mu_0 - 2k$ is merely a scalar multiple of $f^k m$. # Use of AI: I used Gemini 3.1 Pro for tactics, theorems, improvement suggestions, and error explanations. I fully understand and can vouch for all the modifications I have made to the file. # Limitations: I only managed to formalize the finite-dimensional version, although the theorem also holds in the infinite-dimensional case. In the infinite case the existence of a primitive vector is not guaranteed. A quick search suggests that we might need heavy tools like Casimir operators and the universal enveloping algebra, which are totally beyond my current level. I am looking into it, but since there is a significant mathematical gap, I thought it would be best to get this finite-dimensional version merged first.	new-contributor t-algebra large-import awaiting-author merge-conflict label:t-algebra$	336/0	Mathlib/Algebra/Lie/Sl2.lean	1	11	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash', 'pion2024']	ocfnash assignee:ocfnash	0-66041 18 hours ago	47-46678 47 days ago	2-57577 2 days
33377	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): polynomial over Gorenstein ring is Gorenstein	In this PR, we prove that polynomial over Gorenstein ring is Gorenstein. --- - [ ] depends on: #33369 - [ ] depends on: #31884 - [ ] depends on: #32098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-ring-theory	1533/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Gorenstein/Polynomial.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean	12	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-64718 17 hours ago	140-54141 140 days ago	0-107 1 minute
32058	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Baer criterion for injective dimension	In this PR, we added the cateory version of Baer criterion stating that `M` is injective iff `Ext^1(R/I, M)` vanish for all ideal `I`. By dimension shifting, we also have `M` has injective dimension not exceeding `n` iff `Ext^{n + 1}(R/I, M)` vanish for all ideal `I`. --- - [x] depends on: #36980 - [ ] depends on: #39305 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory label:t-algebra$	164/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean	3	75	['Thmoas-Guan', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-splicebot', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	0-63897 17 hours ago	0-63900 17 hours ago	55-67389 55 days
39526	chrisflav author:chrisflav	feat(CategoryTheory/Sites): definition of hypercovers	This is WIP. Co-authored by: Robin Carlier --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory t-algebraic-topology	905/0	Mathlib/AlgebraicTopology/SimplicialObject/Cotensor.lean	1	1	['github-actions']	nobody	0-63496 17 hours ago	unknown	0-0 0 seconds
38319	Zetetic-Dhruv author:Zetetic-Dhruv	feat(Combinatorics/SetFamily): Assouad's dual VC bound	Adds the Finset-level form of Assouad's 1983 dual VC bound: if a family `𝒜 : Finset (Finset α)` has VC dimension at most `d`, then for any ground set `X : Finset α` the dual family `{𝒜.filter (· ∋ x) : x ∈ X}` has VC dimension at most `2 ^ (d + 1) - 1`. New declarations (in `Finset` namespace): - `dualFamily 𝒜 X`: for each `x ∈ X`, the subfamily `{A ∈ 𝒜 \| x ∈ A}` - `mem_dualFamily` (`@[simp]`): membership characterisation - `exists_shatters_of_dualFamily_shatters`: Assouad's bitstring-coding lemma - `vcDim_dualFamily_le`: the headline VC bound Proof by Assouad's classical bitstring-coding argument. Sits on top of `Finset.shatterer` / `Finset.vcDim` from `Mathlib.Combinatorics.SetFamily.Shatter`. References: - P. Assouad, Densite et dimension, Ann. Inst. Fourier 33(3) (1983), Thm 2.13 - J. Matousek, Lectures on Discrete Geometry, GTM 212, Springer, 2002, Section 10.3 Lemma 10.3.3 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	199/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/DualVC.lean,docs/references.bib	3	35	['Shreyas4991', 'YaelDillies', 'Zetetic-Dhruv', 'github-actions']	nobody	0-62860 17 hours ago	9-26287 9 days ago	25-73329 25 days
38950	smmercuri author:smmercuri	chore(Algebra): `coe_algHom` -> `coe_toAlgHom`	--- There are also instances of `coe_ringHom`, `coe_linearMap` etc which I can fix in follow-up PRs [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		78/64	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Centralizer.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Isaacs.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/LinearAlgebra/Charpoly/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean,Mathlib/RingTheory/Algebraic/MvPolynomial.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/DividedPowerAlgebra/Init.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Factorization.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	33	5	['github-actions', 'j-loreaux']	nobody	0-62705 17 hours ago	0-62486 17 hours ago	11-33545 11 days
33379	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Gorenstein local ring is Cohen Macaulay	In this PR, we give the definition of Gorenstein local ring and proved it is Cohen--Macaulay. --- - [ ] depends on: #31884 - [ ] depends on: #26218 - [ ] depends on: #32098 - [ ] depends on: #31644 - [ ] depends on: #33369 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-ring-theory	3764/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	22	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-62185 17 hours ago	140-53229 140 days ago	0-264 4 minutes
38466	Thmoas-Guan author:Thmoas-Guan	feat(ModuleCat): some lemmas for `Ext` over `ModuleCat`	some lemmas for `Ext` over `ModuleCat` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import awaiting-author	70/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean	4	8	['Thmoas-Guan', 'chrisflav', 'github-actions', 'robin-carlier']	chrisflav assignee:chrisflav	0-62066 17 hours ago	0-62066 17 hours ago	23-73032 23 days
36527	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Gorenstein of exists a vanishing ext	A `n`-dimensional Noetherian local ring `R` is Gorenstein if there is an `i > n`, `Ext^i(k, R) = 0`. --- - [ ] depends on: #33379 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-ring-theory	3946/27	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	22	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-61918 17 hours ago	67-57664 67 days ago	0-2167 36 minutes
38721	tb65536 author:tb65536	feat(GroupTheory/Torsion): the torsion subgroup is preserved by isomorphisms	This PR proves that the torsion subgroup is preserved by isomorphisms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	21/3	Mathlib/GroupTheory/Torsion.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Three.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean	4	5	['github-actions', 'mathlib-merge-conflicts', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	0-61769 17 hours ago	0-61830 17 hours ago	17-73051 17 days
33380	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Gorenstein local ring is Cohen--Macaulay local ring of type one	In this PR, we formalized Theorem 18.1 of _Commutaive Ring Theory_ Matsumura. This gives a full characterization of `Ext(k, R)` for Gorenstein local ring and implies that it is equivalent to Cohen--Macaulay local ring of type 1. --- - [ ] depends on: #26245 - [ ] depends on: #33379 - [ ] depends on: #36527 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-ring-theory	5060/163	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRingsExact.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/RingEquiv.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/LinearMap.lean,docs/references.bib	26	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-61507 17 hours ago	140-53006 140 days ago	0-126 2 minutes
39274	ADedecker author:ADedecker	WIP: Fredholm operators	--- - [ ] depends on: #39468 - [ ] depends on: #39475 - [ ] depends on: #39100 - [ ] depends on: #39525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	1625/17	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Analysis/Normed/Operator/Perturbation/StrictByFinite.lean,Mathlib/LinearAlgebra/Dimension/Basic.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/Topology/Algebra/Module/Complement.lean,Mathlib/Topology/Algebra/Module/FredholmOperators.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	12	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-60605 16 hours ago	unknown	0-0 0 seconds
34908	CoolRmal author:CoolRmal	feat(GroupTheory): a characteristic subgroup of a characteristic subgroup is characteristic	The main theorem proved in this PR is `characteristic_of_characteristic_of_characteristic`. If says that if `K` is a characteristic subgroup of a characteristic subgroup `H` of `G`, then `K` is a characteristic subgroup of `G`. Created with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory awaiting-author label:t-algebra$	49/0	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean	2	14	['CoolRmal', 'github-actions', 'robin-carlier']	nobody	0-60386 16 hours ago	0-60386 16 hours ago	2-21189 2 days
39138	Thmoas-Guan author:Thmoas-Guan	refactor(Algebra/GeometricallyReduced): refactor `Algebra.IsGeometricallyReduced`	Refactor `Algebra.IsGeometricallyReduced` to adapt to general algebra over commutative ring. In up-coming #39141, we proved that this definition makes base change to any field reduced. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	43/17	Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean	2	8	['Thmoas-Guan', 'chrisflav', 'github-actions']	nobody	0-60301 16 hours ago	7-83614 7 days ago	8-34930 8 days
37838	Thmoas-Guan author:Thmoas-Guan	feat(FieldTheory): basic theories about transcendental separable extension	The formalization of [Stacks 030W] via [Stacks 030U]. --- - [ ] depends on: #37934 - [ ] depends on: #39138 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	642/32	Mathlib.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean	5	4	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-60145 16 hours ago	37-49642 37 days ago	0-1271 21 minutes
39141	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/GeometricallyReduced): geometrically reduced is reduced for base change to arbitrary field	In this PR, we proved that geometrically reduced algebra is reduced after base change to arbitrary field. --- - [ ] depends on: #37838 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	744/32	Mathlib.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-59285 16 hours ago	8-50503 8 days ago	0-986 16 minutes
37953	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Smooth): transcendental separable extension is formally smooth	In this PR, we proved that transcendental separable extension is formally smooth via reduction to fg cases. --- - [ ] depends on: #37934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	248/0	Mathlib.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/Smooth/Field.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-59263 16 hours ago	36-52433 36 days ago	0-84 1 minute
38931	FordUniver author:FordUniver	chore(Combinatorics/SimpleGraph/Copy): replace classical Fintype.card with Nat.card	Replaces definitions of `copyCount` and `unlabeledCopyCount` with `Nat.card` instead of `Fintype.card` as well as several `Fintype` occurrences with `Finite`. The body of `uniqueUnlabeledCopyBot` is restructured to use `Finite.injective_iff_surjective` since the `Fintype.card_congr` route no longer applies under the weakened `[Finite W]` hypothesis. Adds public `copyCount_eq_nat_card` and `unlabeledCopyCount_eq_nat_card` bridge lemmas so downstream files can characterize the counts (e.g. for `Nat.card_le_card_of_injective` bridging in `InducedCopy.lean`) without unfolding. --- Step 4/5 of the `Copy` / `InducedCopy` refactor-feat stack. As suggested in #38631 by @SnirBroshi and @YaelDillies. I went with `Nat` over `ENat` based on Yael's preference (but I think that could easily be changed to `ENat`). Quite a bit of churn was needed as a consequence. - [ ] depends on: #39307 - [ ] depends on: #38745 - [ ] depends on: #38843 Diff for the changes just in this PR over its predecessor: [link](https://github.com/FordUniver/mathlib4/compare/chore/copy-expose...chore/copy-nat-card)	new-contributor t-combinatorics large-import blocked-by-other-PR	272/258	Mathlib/Combinatorics/SimpleGraph/Copy.lean	1	7	['FordUniver', 'SnirBroshi', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	0-59185 16 hours ago	14-54839 14 days ago	0-2006 33 minutes
39075	Thmoas-Guan author:Thmoas-Guan	feat(Algebra/CommRingCat): colimit of local ring via local hom	In this PR, we deal with filtered colimit of local ring via local homomorphisms, proving it is again local, with maximal ideal equal to the union of images of maximal ideals. Co-authored-by: Wang Jingting --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean	2	1	['github-actions']	nobody	0-58835 16 hours ago	10-59229 10 days ago	10-59339 10 days
39077	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): flat extension of local ring	This PR mainly formalize the theorem [[Stacks 03C3](https://stacks.math.columbia.edu/tag/03C3)] for flat extension of local ring. --- - [ ] depends on: #39075 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR WIP	804/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean,Mathlib/RingTheory/Flat/Extension.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-58824 16 hours ago	10-58035 10 days ago	0-685 11 minutes
37975	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): AdicCompletion of local ring is local	In this PR, we proved that AdicCompletion of local ring wrt the maximal ideal is local ring with maximal ideal equal to the map of the original maximal ideal. Also, removing some old junk produced by myself. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	173/5	Mathlib/RingTheory/AdicCompletion/LocalRing.lean	1	15	['BryceT233', 'Thmoas-Guan', 'github-actions']	alreadydone assignee:alreadydone	0-58815 16 hours ago	35-67249 35 days ago	35-79036 35 days
38331	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/AdicCompletion): AdicCompletion of Noetherian ring is Noetherian	For `I` an ideal of `R`, if `R/I` is Noetherian and `I` is finitely generated, the the completion of `R` wrt `I` is Noetherian. --- - [ ] depends on: #37975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	449/7	Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-58807 16 hours ago	27-63392 27 days ago	0-496 8 minutes
36832	KryptosAI author:KryptosAI	chore(Data/Finset/Card): rename `pred_card_le_card_erase` to `sub_one_card_le_card_erase`	## Summary The name `pred_card_le_card_erase` suggests `Nat.pred` but the statement uses `- 1` (i.e., `Nat.sub 1`). Rename to `sub_one_card_le_card_erase` to match the actual statement. A deprecated alias is added for backwards compatibility. ### Files changed - `Mathlib/Data/Finset/Card.lean` — definition renamed + deprecated alias - `Mathlib/Data/Finset/Powerset.lean` — reference updated - `Mathlib/Combinatorics/Additive/SubsetSum.lean` — reference updated - `Mathlib/Algebra/Polynomial/EraseLead.lean` — reference updated Addresses the `Finset.pred_card_le_card_erase` item in #21584. ## AI disclosure I used Claude Code to explore the codebase (finding all references to rename) and to draft the PR description. I reviewed and understand all changes — these are straightforward renames with a deprecated alias.	new-contributor awaiting-author	22/15	Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Combinatorics/Additive/SubsetSum.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Combinatorics/SetFamily/Shadow.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Set/Card.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/RingTheory/Ideal/Operations.lean	9	8	['KryptosAI', 'Multramate', 'dagurtomas', 'github-actions', 'mattrobball', 'ooovi']	nobody	0-58485 16 hours ago	0-58485 16 hours ago	59-48094 59 days
26923	oliver-butterley author:oliver-butterley	feat(Dynamics/BirkhoffSum): add the pointwise ergodic theorem (Birkhoff's)	The Pointwise Ergodic Theorem, also known as Birkhoff's Ergodic Theorem. Co-authored-by: Lua Viana Reis - [x] depends on: #26074 - [x] depends on: #26807 - [x] depends on: #26810 - [x] depends on: #26840 - [x] depends on: #26842 - [x] depends on: #26848 - [x] depends on: #26851 - [x] depends on: #26852 - [x] depends on: #26853 - [x] depends on: #27008 - [x] depends on: #28901 Zulip: [PR thread](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2326923.20The.20pointwise.20ergodic.20theorem.20.28Birkhoff's.29/with/527835158) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics new-contributor awaiting-author	398/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean	2	33	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'rwst', 'sgouezel', 'urkud']	sgouezel assignee:sgouezel	0-58059 16 hours ago	153-32022 153 days ago	98-50945 98 days
39289	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Cohen structure theorem	In this PR, we prove the existence of coefficient ring by the following two cases: 1: for residue field with char zero, there is a section of the residue field 2: for positive char, there exists a Cohen ring Both can be applied to the last statement to obtain Cohen structure theorem. (In the version of [Stacks 0323](https://stacks.math.columbia.edu/tag/0323)) Co-authored-by: @BryceT233 --- - [ ] depends on: #28683 - [ ] depends on: #38331 - [ ] depends on: #39077 - [ ] depends on: #37838 - [ ] depends on: #37953 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import blocked-by-other-PR	2500/39	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/CohenStructureTheorem.lean,Mathlib/RingTheory/Flat/Extension.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/Smooth/Field.lean	11	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-57803 16 hours ago	5-70394 5 days ago	0-417 6 minutes
35561	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): power series over regular local ring	In this PR, we proved that power series over regular local ring is again regular local ring. Same for finite multivariable power series. --- - [ ] depends on: #28682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory	63/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean	2	5	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-57797 16 hours ago	87-77822 87 days ago	0-5 5 seconds
35560	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Corollaries of Cohen Structure Theorem	Corollaries of Cohen structure theorem, saying that complete local ring can be represented as quotient of regular local ring. --- - [ ] depends on: #28683 - [ ] depends on: #35561 - [ ] depends on: #39289 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	3197/177	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/CohenStructureTheorem.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/Extension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean,Mathlib/RingTheory/Smooth/Field.lean	20	10	['BryceT233', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-57759 16 hours ago	87-78045 87 days ago	0-8 8 seconds
38905	YaelDillies author:YaelDillies	feat(Geometry/Convex): convex sets in a `ConvexSpace`	Define convex sets in a convex space. To allow full generality on the coefficients, for `s` to be convex we require that all finitary convex combinations of points of `s` lie in `s`, instead of merely binary ones as is customary. Since its body is an implementation detail, the predicate `IsConvexSet` is unexposed. `Convex` will be deprecated to `IsConvexSet` in a later PR. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/Convexity.20refactor/with/593967042) --- - [x] depends on: #37592 - [x] depends on: #38860 - [x] depends on: #38861 - [x] depends on: #38904 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	256/3	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/README.md,Mathlib/Geometry/Convex/Set.lean	7	10	['YaelDillies', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-56785 15 hours ago	3-69420 3 days ago	3-69415 3 days
38934	YaelDillies author:YaelDillies	feat(Geometry): convex hull in a `ConvexSpace`	--- - [ ] depends on: #38905 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-convex-geometry	375/3	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/Hull.lean,Mathlib/Geometry/Convex/README.md,Mathlib/Geometry/Convex/Set.lean	8	9	['YaelDillies', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-56730 15 hours ago	14-48624 14 days ago	0-713 11 minutes
37934	Thmoas-Guan author:Thmoas-Guan	feat(FieldTheory): definition of transcendental separable field extension	In this PR, we introduce the concept of separably generated field extension and transcendental separable field extension. Further properties will be in #37838 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	110/0	Mathlib.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean	2	12	['Thmoas-Guan', 'github-actions', 'robin-carlier']	robin-carlier assignee:robin-carlier	0-55471 15 hours ago	8-51085 8 days ago	16-69255 16 days
34031	lua-vr author:lua-vr	feat(Dynamics/BirkhoffSum): add the maximal ergodic theorem	--- This file exports three constants: ```lean public def birkhoffAverageSupSet (f : α → α) (g : α → ℝ) (a : ℝ) : Set α := {x \| ∃ n : ℕ, a < birkhoffAverage ℝ f g n x} public theorem meas_birkhoffAverageSupSet_smul_const_le_integral (a : ℝ) (ha : 0 < a) : μ.real (birkhoffAverageSupSet f g a) • a ≤ ∫ x in birkhoffAverageSupSet f g a, g x ∂μ public theorem meas_birkhoffAverageSupSet_smul_const_le_norm (a : ℝ) (ha : 0 < a) : μ.real (birkhoffAverageSupSet f (fun x ↦ ‖g x‖) a) • a ≤ ∫ x, ‖g x‖ ∂μ ``` In my interpretation, the other constants are auxiliary, so I did not make them public. If it's of independent interest, `birkhoffMax` could be exported or moved to a dedicated file, but I'm not sure of that at the moment. - [x] depends on: #34030 - [x] depends on: #34029 - [x] depends on: #34025 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics	297/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Maximal.lean	2	5	['github-actions', 'lua-vr', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-53587 14 hours ago	31-70811 31 days ago	42-71171 42 days
39423	harahu author:harahu	chore: ensure sections end with an empty line	This makes the docs easier to read. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy documentation	21/0	Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/AlgebraicGeometry/Morphisms/SchemeTheoreticallyDominant.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/Topology/Homotopy/Product.lean	14	2	['github-actions', 'harahu']	nobody	0-53005 14 hours ago	3-38720 3 days ago	3-38713 3 days
38153	xroblot author:xroblot	chore(IsGaloisGroup): refactor `IsGaloisGroup.quotient`	Refactors the quotient construction in `IsGaloisGroup` to work at the level of ring extensions rather than intermediate fields. --- - [x] depends on: #38377 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	214/54	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	2	27	['Garmelon', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'riccardobrasca', 'tb65536', 'xroblot']	riccardobrasca assignee:riccardobrasca	0-52050 14 hours ago	2-64731 2 days ago	7-11969 7 days
38938	lua-vr author:lua-vr	chore(ConditionallyCompleteLattice/Indexed): dualize	--- - [ ] depends on: #38906 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-order	112/251	Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	3	6	['github-actions', 'lua-vr', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-50924 14 hours ago	unknown	0-0 0 seconds
39523	kim-em author:kim-em	feat(LinearAlgebra/Trace): trace-zero idempotent endomorphism over CharZero field is zero	This PR adds `LinearMap.IsIdempotentElem.eq_zero_of_trace_eq_zero`: an idempotent endomorphism of a finite-dimensional vector space over a characteristic-zero field with vanishing trace is the zero map. The proof routes through `LinearMap.IsProj.trace` (already in this file) — for an idempotent `e`, the trace equals the rank of `range e`. Over a `CharZero` field, vanishing trace forces the rank to zero, hence `range e = ⊥` and `e = 0`. Extracted from a downstream formalization that needed the lemma to close a Young-symmetrizer off-block-vanishing step, but the statement has no Young / Schur / Specht content — it is a generic CharZero linear-algebra fact. 🤖 Prepared with Claude Code	t-algebra awaiting-author label:t-algebra$	21/0	Mathlib/LinearAlgebra/Trace.lean	1	2	['github-actions', 'themathqueen']	nobody	0-50738 14 hours ago	0-50738 14 hours ago	0-30447 8 hours
39527	MichaelStollBayreuth author:MichaelStollBayreuth	chore: add shortcut instances for Rat, Complex	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP slow-typeclass-synthesis t-algebra label:t-algebra$	6/0	Mathlib/Algebra/Ring/Rat.lean,Mathlib/Data/Complex/Basic.lean	2	3	['MichaelStollBayreuth', 'github-actions', 'leanprover-radar']	nobody	0-50546 14 hours ago	0-56121 15 hours ago	0-2 2 seconds
39510	mbkybky author:mbkybky	WIP: any regular local ring is a UFD	Show that any regular local ring is a unique factorization domain. - [ ] depends on: #29802 - [ ] depends on: #36739 - [ ] depends on: #39067 - [ ] depends on: #39420 --- Prepared with Codex [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory large-import blocked-by-other-PR	5154/177	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Basic.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/FiniteFreeResolution/Basic.lean,Mathlib/Algebra/Module/FiniteFreeResolution/Exact.lean,Mathlib/Algebra/Module/FiniteFreeResolution/HasProjectiveDimensionLE.lean,Mathlib/Algebra/Module/FiniteFreeResolution/Localization.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/Module/StablyFree/HasFiniteFreeResolution.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Depth/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Depth/Basic.lean,Mathlib/RingTheory/Depth/Ischebeck.lean,Mathlib/RingTheory/Depth/Rees.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/LocallyFree.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/UFD.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/LocalProperties/FinitePresentation.lean,Mathlib/RingTheory/LocalProperties/Invertible.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Finiteness.lean,Mathlib/RingTheory/Regular/Free.lean,Mathlib/RingTheory/Regular/LinearMap.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Localization.lean,Mathlib/RingTheory/RegularLocalRing/UFD.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/Support.lean,Mathlib/RingTheory/UniqueFactorizationDomain/Localization.lean,docs/references.bib	49	3	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	0-49407 13 hours ago	1-56059 1 day ago	0-21 21 seconds
39370	fpvandoorn author:fpvandoorn	feat: add specialized grind sets	This adds two grind attributes for specialized tactics. See module doc for more information and motivation. This PR does not tag any lemmas yet. [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/small.20specialized.20grind.20sets/with/595132109) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	113/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean	4	5	['chenson2018', 'fpvandoorn', 'github-actions']	dwrensha assignee:dwrensha	0-48761 13 hours ago	4-47437 4 days ago	4-47430 4 days
39531	YaelDillies author:YaelDillies	feat(Geometry/Convex): modules are convex spaces	Show that every semimodule over an ordered semiring is a convex space. It is sadly impossible to make this a global instance since it creates diamonds with structural instances such as `ConvexSpace R X → ConvexSpace R Y → ConvexSpace R (X × Y)` because `(∑ i, f i).fst = ∑ i, (f i).fst` isn't defeq, ultimately because `Finset.sum` isn't a field of `AddCommMonoid`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry awaiting-author	181/60	Mathlib.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Geometry/Convex/ConvexSpace/AffineSpace.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/ConvexSpace/Module.lean,Mathlib/Geometry/Convex/ConvexSpace/Prod.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean	9	7	['github-actions', 'ocfnash']	nobody	0-47451 13 hours ago	0-48615 13 hours ago	0-1803 30 minutes
38318	JovanGerb author:JovanGerb	feat(GRewrite): new `grw` implementation	This PR adds a new implementation of the `grewrite` tactic. It replaces `grw` with the new implementation. The old implementation can be used with `grw +useKAbstract`. New features: - The new `grw` can rewrite terms with bound variables. - The new `grw` will only rewrite in places where this is valid. Previously, if there were both valid and non-valid positions, it would try rewriting everywhere and then complain. Future features that will build on the new implementation: - I'd like to add support for strict rewrites that can change the strictness of parts of the goal. This would require the concept of asymmetric `gcongr` lemmas, something like `le_imp_lt_of_lt_left` and `le_imp_lt_of_lt_right`. An example of such a lemma that already exists in mathlib is `Ico_subset_Ioo_left`. - I'd like to improve the support for rewriting with symmetric relations such as `=ᵥ`. The following doesn't work very well yet: ``` variable {R : Type*} [CommRing R] [ValuativeRel R] {x y z : R} example (h : x =ᵥ y) : x <ᵥ z ↔ y <ᵥ z := by grw [h] ``` Limitations: - The new implementation does not support occurrences. So, `nth_grw` still uses the old `kabstract`-based implementation. The reason is that there are often multiple `gcongr` lemmas for rewriting in the same place (e.g. `add_le_add` and `add_le_add_left`), and it's tricky to keep track of exactly what is "the same" subexpression. - The new implementation tries `gcongr` lemmas one by one, and commits to the first `gcongr` lemma that lets us do a rewrite. This means that we need to lower the priority of `add_le_add_left`, so that `add_le_add` is preferred, so that we can rewrite on both sides of `+` at the same time. However, `mul_le_mul_of_nonneg_left` and `mul_le_mul_of_nonneg_right` are still tried before `mul_le_mul`, to avoid getting unnecessary side goals. - Because the new term is constructed from `gcongr` lemmas, rather than by instantiating the result of `kabstract`, it may be that metadata gets lost, or that some implicit arguments change. For example, rewriting inside `a ≤ b` for `a b : Nat` will change the instance argument from `Nat.instLE` to `Nat.instPreorder.toLE`. This is not really a problem. - Some problems arise when implementing a rewriting tactic that can rewrite under binders, because metavariables have a fixed local context of free variables that they are allowed to depend on. This issue also affects the new `rw` tactic that the FRO is currenlty working on. This PR works around this by "illegally" changing the local context of metavariabes, so as to allow them to depend on bound variables. This has the unfortunate side effect that the "Expected Type" view can get messed up when rewriting bound variables, because the expression is being delaborated with the wrong local context. But I think this is only a minor problem. We coould reconsider this design when the new `rw` tactic is done. Changes to `gcongr`: - The `@[goncgr]` attribute now checks more thoroughly whether the given lemma is of the right form. Some lemmas are not suitable for use in `grw`, but they still "feel" like a `gcongr` lemma, so we still allow them to be used in `gcongr`. For such cases I've added a linter warning that can be turned off. - I've refactored how `gcongr` lemmas are applied, in order to share this code between `gcongr` and `grw`. Now, binder names are taken from the goal when possible, rather than not giving any name to new free variables. This improves `gcongr` (as it means you don't anymore need to write `gcongr with ...` to give the variable a name), and allows `grw` to preserve binder names in the goal. The grewrite test file now tests the new `grw` implementation. Should I make a copy of the test file to also test the old implementation? I have put myself as the copyright holder, instead of Sebastian Zimmer, as I think this more accurately reflect code ownership. The original `grw` PR was by Sebastian in 2023, but it was majorly rewritten by me in 2025. Sebastian is still in the list of authors. --- - [x] depends on: #38558 - [x] depends on: #38556 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	686/254	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Analysis/CStarAlgebra/Extreme.lean,Mathlib/Analysis/Convex/StrictCombination.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Combinatorics/Graph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Average.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsolutelyContinuousFun.lean,Mathlib/Order/Basic.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Independence.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRewrite/Core.lean,Mathlib/Tactic/GRewrite/Elab.lean,Mathlib/Topology/MetricSpace/ThickenedIndicator.lean,MathlibTest/GCongr/GCongr.lean,MathlibTest/GCongr/implications.lean,MathlibTest/GRewrite.lean	22	40	['JovanGerb', 'PatrickMassot', 'Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'mathlib-dependent-issues']	dwrensha assignee:dwrensha	0-46951 13 hours ago	9-19507 9 days ago	10-38417 10 days
38126	JovanGerb author:JovanGerb	feat: overlapping instances linter	This PR implements the overlapping instances linter, with better performance than the previous attempt. An annoyance is the need for `withSetBoolOptionIn`. This is a private declaration in the `unusedInstancesInType` linter, with a link to an unsolved issue. I've marked it public, but maybe it should go to a separate file, depending on how fast we think the issue will be resolved. See #35095 and #34955 for previous iterations of this linter. See #14731 for an old attempt at a weaker form of this linter. Co-authored-by: @thorimur --- - [x] depends on: #38151 - [x] depends on: #38150 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	753/51	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Homology/HomotopyFiber.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/Normed/Field/Krasner.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/ConjSqrt.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean,Mathlib/CategoryTheory/Triangulated/LocalizingSubcategory.lean,Mathlib/Control/Applicative.lean,Mathlib/Control/Functor.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/Init.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Lemmas.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean,Mathlib/Logic/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/NormalClosure.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/OverlappingInstances.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Topology/Algebra/MulAction.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Connected/PathConnected.lean,MathlibTest/OverlappingInstances.lean,MathlibTest/Subsingleton.lean,MathlibTest/Variable.lean,MathlibTest/WhitespaceLinter.lean,MathlibTest/congr.lean,MathlibTest/norm_num.lean	67	100	['JovanGerb', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	0-46832 13 hours ago	0-43277 12 hours ago	21-76457 21 days
39491	Yu-Misaka author:Yu-Misaka	feat(Mathlib/LinearAlgebra/RootSystem/CartanMatrix): a Cartan matrix of a reduced crystallographic root system cannot have eigenvalue 4	This proves the TODO that a Cartan matrix of a reduced crystallographic root system cannot have eigenvalue 4. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	125/8	Mathlib/Data/Matrix/Mul.lean,Mathlib/LinearAlgebra/RootSystem/CartanMatrix.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Basis.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean	4	5	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'ocfnash']	ocfnash assignee:ocfnash	0-46577 12 hours ago	2-7081 2 days ago	0-10 10 seconds
39216	emlis42 author:emlis42	feat(Topology/Algebra/InfiniteSum): add `limUnder_eq_tprod`	This PR adds `limUnder_eq_tprod` and `limUnder_eq_tsum`.	t-topology new-contributor	10/0	Mathlib/Topology/Algebra/InfiniteSum/Defs.lean	1	6	['SnirBroshi', 'emlis42', 'github-actions', 'grunweg', 'mathlib-bors']	urkud assignee:urkud	0-46268 12 hours ago	0-46270 12 hours ago	6-79087 6 days
30230	CoolRmal author:CoolRmal	feat(MeasureTheory): the integral of a vector-valued function against a vector measure is additive	Add some basic lemmas about the integral of a vector measure. This PR specifically focuses on the additivity of the integral. Created with the help of Codex. --- - [x] depends on: #28499 - [x] depends on: #39103 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	376/25	Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean	4	13	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	0-46171 12 hours ago	1-56980 1 day ago	5-84821 5 days
39055	vihdzp author:vihdzp	chore: deprecate `not_lt_zero'` and `bot_eq_zero''`	Two easy pickings from #38663. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	24/37	Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/IsBotOne.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/List/Shortlex.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/Topology/MetricSpace/PiNat.lean	11	6	['YaelDillies', 'github-actions', 'leanprover-radar', 'riccardobrasca', 'vihdzp']	nobody	0-46145 12 hours ago	11-19816 11 days ago	11-19809 11 days
32555	ksenono author:ksenono	feat(Combinatorics/SimpleGraph/Matching): maximum and maximal matchings for Konig's theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	112/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean	2	46	['SnirBroshi', 'SproutSeeds', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'ksenono']	YaelDillies assignee:YaelDillies	0-45707 12 hours ago	0-59866 16 hours ago	130-57925 130 days
39525	ocfnash author:ocfnash	feat: the preimage of a finite (co)dimensional submodule has finite (co)dimension	if the map has finite-dimensional (co)kernel. Written at the ICERM workshop "Techniques and Tools for the Formalization of Analysis". Extracted from #39274 which defines Fredholm operators --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra maintainer-merge label:t-algebra$	85/1	Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/LinearAlgebra/Dimension/Basic.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean	7	22	['ADedecker', 'github-actions', 'ocfnash', 'robin-carlier', 'themathqueen']	nobody	0-45624 12 hours ago	0-46730 12 hours ago	0-59268 16 hours
38619	mariainesdff author:mariainesdff	feat(Algebra/SkewPolynomial/Basic): add API	We add API for SkewPolynomial, including monomial, coeff, C and X. Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	326/25	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	30	['faenuccio', 'github-actions', 'mariainesdff']	faenuccio assignee:faenuccio	0-44767 12 hours ago	3-59316 3 days ago	15-81805 15 days
39463	joelriou author:joelriou	feat(AlgebraicTopology): weakly polyhedral like simplicial sets	In this file, we introduce a typeclass `SSet.IsWeaklyPolyhedralLike` for a simplicial set `X : SSet`: it says that for any non-degenerate simplex `x : X _⦋n⦌`, the corresponding morphism `Δ[n] ⟶ X` is a monomorphism. --- (I would welcome any better name than `IsWeaklyPolyhedralLike`.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology awaiting-author	110/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/WeaklyPolyhedralLike.lean	2	4	['github-actions', 'joelriou', 'robin-carlier']	nobody	0-44359 12 hours ago	0-64628 17 hours ago	1-76532 1 day
39412	mbkybky author:mbkybky	feat(RingTheory/Flat): a finite flat `R`-module `M` is locally free if `rankAtStalk M` is constant	Let `M` be a finite flat `R`-module, `p` be a prime ideal of `R`. We show that if `rankAtStalk M` is constant, then there exists `a ∉ p` such that the `M` is free after localization away from `a`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	137/2	Mathlib.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/RingTheory/Flat/LocallyFree.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/Support.lean	8	4	['github-actions', 'robin-carlier']	nobody	0-44317 12 hours ago	0-44317 12 hours ago	3-49294 3 days
39269	godofecht author:godofecht	feat(Algebra/Spectrum): add the second resolvent identity	Adds `spectrum.resolvent_sub_resolvent`: For `a b : A` in an `R`-algebra and `r` in the resolvent set of both, `resolvent a r - resolvent b r = resolvent a r * (a - b) * resolvent b r`. Companion to `spectrum.resolvent_eq`.	t-algebra new-contributor label:t-algebra$	15/0	Mathlib/Algebra/Algebra/Spectrum/Basic.lean	1	3	['github-actions', 'wwylele']	nobody	0-44259 12 hours ago	6-32424 6 days ago	6-32417 6 days
39533	b-mehta author:b-mehta	feat(Data/Finset/Image): add image_comp and image_comp_image	The statement `image_comp` is worth adding because it matches the Set version, and also is more useful for rewriting in the forward direction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	8/0	Mathlib/Data/Finset/Image.lean	1	1	['github-actions']	nobody	0-44171 12 hours ago	0-44251 12 hours ago	0-44244 12 hours
39329	lecopivo author:lecopivo	feat(fun_prop): eager application of transition theorems for fun_prop	For properties like Integrable we want to apply transition theorems(like Continuous -> Integrable) eagerly --- This is a change necessary in preparation for making `fun_prop` work for integrability. --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	93/30	Mathlib/Tactic/FunProp/Attr.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,MathlibTest/FunPropMinimal.lean	4	14	['b-mehta', 'github-actions', 'lecopivo', 'mathlib-merge-conflicts']	JovanGerb assignee:JovanGerb	0-43906 12 hours ago	2-57854 2 days ago	1-47071 1 day
39535	b-mehta author:b-mehta	feat(Data/Finset/Powerset): add biUnion_id_subset_iff_subset_powerset	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	5/0	Mathlib/Data/Finset/Powerset.lean	1	1	['github-actions']	nobody	0-43013 11 hours ago	0-43104 11 hours ago	0-43097 11 hours
39534	robin-carlier author:robin-carlier	feat(CategoryTheory/MorphismProperty): `HasPullbacksAgainst`	Given `P P̀': MorphismProperty C`, we add a type class `HasPullbacksAgainst` expressing that any morphism satisfying `P` admits a pullback along any morphism satisfying `P'`. We also add a type-class expressing that pullbacks of morphisms of `P` along any morphism satisfying `P'` still satisfies `P`. This will be used to encode pairs of morphism properties for which suitable bicategories of spans exist. From [SymmMonCoherence](https://github.com/robin-carlier/SymmMonCoherence) --- I welcome any better name here! `HasPullacksAlong` and friends are already taken, hence I picked "against". [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	96/0	Mathlib/CategoryTheory/MorphismProperty/Limits.lean	1	1	['github-actions']	nobody	0-42891 11 hours ago	0-43345 12 hours ago	0-43338 12 hours
39536	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory): Spans with left and right legs satisfying given morphism properties	In this PR, we define a structure `Span Wₗ Wᵣ c c'` which bundles the data of spans in `C` from `c` to `c'` where the left map satisfies `Wₗ` and the right map satisfies `Wᵣ`. When `Wₗ` and `Wᵣ` are adequate, we define the identity span and the composition of compatible spans. In a later pull request, this will be extended to be the 1-morphisms of a bicategory structure on a type alias of `C`. From [SymmMonCoherence](https://github.com/robin-carlier/SymmMonCoherence) --- - [ ] depends on: #39534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	237/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Span/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-41789 11 hours ago	0-42422 11 hours ago	0-663 11 minutes
39537	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/Span): bicategories of spans	In this PR, we extend the constructions from #39536 to a bicategory structure on `Spans C Wₗ Wᵣ`, which is a type alias for `C`, where the 1-morphisms are spans in `C` with left leg satisfying `Wₗ` and the right leg satisfies `Wᵣ`. From [SymmMonCoherence](https://github.com/robin-carlier/SymmMonCoherence) --- - [ ] depends on: #39536 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	614/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Span/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-41778 11 hours ago	0-42044 11 hours ago	0-905 15 minutes
39113	sgouezel author:sgouezel	feat: integration by parts for stieltjes vector measures	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	1365/240	Mathlib.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/CompleteOfCompleteLp.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/WithDensityVec.lean,Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Martingale/Centering.lean	23	2	['github-actions', 'mathlib-bors']	nobody	0-41596 11 hours ago	9-68365 9 days ago	0-8 8 seconds
39529	lecopivo author:lecopivo	feat: tactic `apply_rulesets`	`apply_rulesets` is just like `apply_rules` but allows to create rule sets, ruleprocs (similar to simprocs), handles metavariables in the goal and couple of other nifty features --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	1870/0	Mathlib/Tactic.lean,Mathlib/Tactic/ApplyRuleSets.lean,Mathlib/Tactic/ApplyRuleSets/Attr.lean,Mathlib/Tactic/ApplyRuleSets/Core.lean,Mathlib/Tactic/ApplyRuleSets/Elab.lean,Mathlib/Tactic/ApplyRuleSets/RuleProc.lean,Mathlib/Tactic/ApplyRuleSets/Types.lean,MathlibTest/ApplyRuleSetsAttr.lean,MathlibTest/ApplyRuleSetsRegister.lean,MathlibTest/ApplyRuleSetsRingExpr.lean,MathlibTest/apply_rulesets.lean	11	2	['github-actions', 'mathlib-bors']	nobody	0-41583 11 hours ago	0-54912 15 hours ago	0-8 8 seconds
39414	SnirBroshi author:SnirBroshi	chore(Data/Set/Card): make `s.ncard` the simpNF of `Fintype.card s`	Untags `coe_fintypeCard : ↑(Fintype.card s) = s.encard` as `@[simp]`, and instead tags - `fintypeCard_eq_ncard : Fintype.card s = s.ncard` - `coe_ncard_eq_encard : ↑(s.ncard) = s.encard` Then untags `simp` lemmas which are no longer simpNF because of this change; simpNF versions of some of them will be introduced in future PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	23/28	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/GroupTheory/ClassEquation.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Card.lean,Mathlib/Order/Interval/Finset/Defs.lean	12	7	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions']	Vierkantor assignee:Vierkantor	0-40886 11 hours ago	3-56383 3 days ago	3-56376 3 days
37766	chrisflav author:chrisflav	feat(AlgebraicGeometry): restriction of quasi-coherent sheaf is quasi-coherent	--- - [ ] depends on: #37773 - [ ] depends on: #37775 - [ ] depends on: #38181 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebraic-geometry large-import merge-conflict	343/0	Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/Limits/Preorder.lean	5	6	['Brian-Nugent', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-40731 11 hours ago	41-39741 41 days ago	0-2 2 seconds
39260	sharky564 author:sharky564	feat(Topology/Algebra/Module/Complement): bundle `prodEquivOfIsCompl` and `quotientEquivOfIsCompl`, add `ContinuousLinearMap.ofIsTopCompl`	This PR completes the three TODO items listed at the top of `Mathlib/Topology/Algebra/Module/Complement.lean` (introduced in #38547). `Submodule.prodEquivOfIsCompl` is shown to be a homeomorphism if and only if the two submodules are topological complements. The analogous characterisation for `Submodule.quotientEquivOfIsCompl` is also provided, and `ContinuousLinearMap.ofIsTopCompl` is defined as the continuous version of `LinearMap.ofIsCompl`, taking continuous linear maps from complementary submodules and producing the induced continuous linear map on the whole space. ---	t-topology new-contributor	160/20	Mathlib/LinearAlgebra/Projection.lean,Mathlib/Topology/Algebra/Module/Complement.lean	2	53	['ADedecker', 'github-actions', 'sharky564', 'themathqueen']	themathqueen assignee:themathqueen	0-40523 11 hours ago	2-53666 2 days ago	5-55295 5 days
38709	tb65536 author:tb65536	feat(Algebra/Polynomial/Roots): roots of `p(-X)`	This PR proves that the roots of `p(-X)` are just the negatives of the roots of `p`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	36/0	Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	3	['github-actions', 'robin-carlier', 'tb65536']	alreadydone assignee:alreadydone	0-40345 11 hours ago	0-40352 11 hours ago	19-23975 19 days
38631	FordUniver author:FordUniver	feat(Combinatorics/SimpleGraph/InducedCopy): add `UnlabeledEmbedding`, `unlabeledEmbeddingCount` and `embeddingCount`	Extracts the induced-containment material from `SimpleGraph/Copy.lean` into a new `SimpleGraph/InducedCopy.lean` and adds the induced analogues of `UnlabeledCopy`/`copyCount`/`unlabeledCopyCount`: a type `UnlabeledEmbedding G H` for induced subgraphs of `H` isomorphic to `G`, a count `H.embeddingCount G := Nat.card (G ↪g H)` for induced labeled copies (i.e. graph embeddings), and a count `H.unlabeledEmbeddingCount G := Nat.card (G.UnlabeledEmbedding H)` for induced unlabelled copies, each with the parallel `_of_isEmpty` / `_eq_zero` / `_pos` / `_le_` / `_eq_nat_card` API. `IsIndContained`, the `⊴` notation, `IndFree`, and all related lemmas move from `Copy.lean` to the new file. `Embedding.range_toSubgraph` characterises induced subgraphs as the range of `Embedding.toSubgraph : (G ↪g H) → H.Subgraph` and bridges `embeddingCount` to `unlabeledEmbeddingCount`. --- Final step 5/5 of the `Copy` / `InducedCopy` refactor stack.* The new file mirrors `Copy.lean`'s organisation (containment → counting → killing sections) for the induced row; the killing-induced-copies machinery is left as a TODO. Naming follows the convention established in #38745: types are guest-first (`UnlabeledEmbedding G H`, `IsIndContained G H`), operations host-first (`H.embeddingCount G`, `H.unlabeledEmbeddingCount G`). The induced labelled type is `Embedding`, i.e., `G ↪g H`, directly. Two bookkeeping changes in `Copy.lean`: `Copy.isContained` / `Embedding.isContained` / `Iso.isContained`/`'` and `isContained_iff_exists_le_comap`, which lived in the now-deleted "Induced containment" section but are non-induced, move up into the `IsContained` section. `LineGraph.lean`'s `Copy` import switches to `InducedCopy` since it uses `IsIndContained`. The cross-module proofs `embeddingCount_le_copyCount` and `unlabeledEmbeddingCount_le_unlabeledCopyCount` bridge through the public `copyCount_eq_nat_card`/`unlabeledCopyCount_eq_nat_card` lemmas introduced in #38931 (the counts themselves remain unexposed per @plp127's review). `Embedding.ofIsInduced` (used by `Embedding.range_toSubgraph`) comes from the independent prerequisite #39288. \| \| labeled \| unlabeled \| \|---\|---\|---\| \| ordinary \| `Copy` / `copyCount` \| `UnlabeledCopy` / `unlabeledCopyCount` \| \| induced \| `Embedding` / `embeddingCount` \| `UnlabeledEmbedding` / `unlabeledEmbeddingCount` \| This branch sits on top of an octopus-merge diffbase (`FordUniver:diffbase/ind-copy-count`) of `chore/copy-nat-card` and `feat/subgraph-ofIsInduced`, so the link below shows only the changes intrinsic to this PR. - [ ] depends on: #39307 - [ ] depends on: #38745 - [ ] depends on: #38843 - [ ] depends on: #38931 - [ ] depends on: #39288 Diff for the changes just in this PR over its predecessors: [link](https://github.com/FordUniver/mathlib4/compare/diffbase/ind-copy-count...feat/ind-copy-count).	t-combinatorics new-contributor blocked-by-other-PR large-import	635/343	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/InducedCopy.lean,Mathlib/Combinatorics/SimpleGraph/LineGraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	5	41	['FordUniver', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'plp127']	nobody	0-40312 11 hours ago	17-79141 17 days ago	2-46521 2 days
39271	tb65536 author:tb65536	feat(RingTheory/Ideal/MinimalPrime/Localization): criterion for `R ⧸ I` to have dimension zero	This PR proves that a quotient `R ⧸ I` has dimension at most zero iff all minimal primes over `I` are maximal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	20/0	Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/Zero.lean	2	3	['github-actions', 'robin-carlier', 'tb65536']	nobody	0-39789 11 hours ago	0-39843 11 hours ago	6-21707 6 days
39524	FordUniver author:FordUniver	feat(MeasureTheory/Integral/CurveIntegral): integrability and FTC along a line segment	Specialises curve integration to the line segment between two points: smoothness of the segment as a `C¹` curve, sufficient conditions for a continuous one-form to be integrable along a segment, and a fundamental-theorem-of-calculus identity for the segment integral of a Fréchet derivative. --- Used by a [planned descent-lemma PR for Lipschitz-smooth functions](https://github.com/FordUniver/mathlib4/blob/5ebc6dae88deb11410d21c0a2628f53c092bb536/Mathlib/Analysis/Calculus/LipschitzSmooth/FDeriv.lean#L133), which needs an FTC along an affine line to integrate a directional derivative over a segment. Three points to highlight: 1. I thought about renaming `curveIntegrable_segment` to `curveIntegrable_segment_iff` for consistency with the file's other `_iff`-suffixed biconditionals, but the new `_const` takes a different name slot, so the rename would be an unnecessary public API break. 2. `Path.segment_contDiffOn` is really a fact about `Path.segment` rather than about curve integration, so it would more naturally live in `Convex/PathConnected.lean`. Unfortunately that target is blocked by a build cycle (`Calculus.AddTorsor.AffineMap` already transitively imports `Convex.PathConnected` via `Convex.Topology`/`Convex.StdSimplex`), so it sits with its consumer here. 3. The new `Continuous{,On}.curveIntegrable_segment` lemmas are the obvious `@[fun_prop]` candidates, but `CurveIntegrable` isn't a registered `fun_prop` concept yet; that registration is a small design call (identity/constant/composition choices, plus tagging the file's pre-existing producers) worth its own focused review and is deferred to a follow-up. `Path.segment_contDiffOn` carries the tag since `ContDiffOn` is already registered. - [ ] depends on: #39206 Diff for the changes just in this PR over its predecessor: [link](https://github.com/FordUniver/mathlib4/compare/feat/lineMap-contDiff...feat/curveIntegral-segment-FTC)	t-measure-probability blocked-by-other-PR	106/18	Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/MeasureTheory/Integral/CurveIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/CurveIntegral/Poincare.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-39376 10 hours ago	0-69481 19 hours ago	0-2904 48 minutes
39206	FordUniver author:FordUniver	feat(Analysis/Calculus/AddTorsor/AffineMap): smoothness of AffineMap.lineMap	Add `AffineMap.lineMap_contDiff_uncurry` (joint smoothness in all three arguments), `AffineMap.lineMap_contDiff` (smoothness in the parameter with fixed endpoints), and the composition family `ContDiff.lineMap`, `ContDiffOn.lineMap`, `ContDiffAt.lineMap`, `ContDiffWithinAt.lineMap`, mirroring the corresponding `Continuous` family in `Mathlib.Topology.Algebra.Affine`. The uncurried and `ContDiffWithinAt` forms are tagged `@[fun_prop]` so the rest are automatically derivable. Closes the TODO at `Mathlib.MeasureTheory.Integral.CurveIntegral.Poincare:333` where the proof now reduces to `fun_prop`. --- Came up while formalizing the descent lemma for Lipschitz-smooth functions, where `Path.segment a b` being smooth on the unit interval is needed to apply [FTC along the segment](https://github.com/FordUniver/mathlib4/pull/21); `AffineMap.lineMap_contDiff` is the lemma directly used there. Two things I was genuinely not quite sure about: 1. Should the three convenience variants `ContDiffAt.lineMap`, `ContDiffOn.lineMap`, and `ContDiff.lineMap` be included? They are not strictly necessary but they exist for users wanting to write `h₁.lineMap h₂ hg` in dot notation by hand, and they mirror the convention of the `Continuous.lineMap` family. 2. Is `Mathlib.Analysis.Calculus.AddTorsor.AffineMap` the right home, and is adding `public import Mathlib.Analysis.Calculus.AddTorsor.AffineMap` to `Poincare.lean` to close the TODO reasonable? The placement mirrors the `Continuous.lineMap` family in `Mathlib.Topology.Algebra.Affine`, but hiding a `@[fun_prop]` in a file at the bottom of the hierarchy and needing to import it feels a bit off.	t-measure-probability	56/4	Mathlib/Analysis/Calculus/AddTorsor/AffineMap.lean,Mathlib/MeasureTheory/Integral/CurveIntegral/Poincare.lean	2	1	['github-actions']	sgouezel assignee:sgouezel	0-39304 10 hours ago	7-47282 7 days ago	7-47275 7 days
39540	allenhaozhu author:allenhaozhu	feat(Probability): measure-theoretic No-Free-Lunch via finite-k adversary	Add `Mathlib/Probability/NoFreeLunch.lean`, the measure-theoretic finite-`k` version of the Devroye-Gyorfi-Lugosi No-Free-Lunch theorem. For any finite input type `K` of cardinality `k` and any deterministic learning algorithm `A : (Fin n → K × Bool) → (K → Bool)`, averaging the discrete misclassification risk over the `2^k` uniformly random boolean labelings `r : K → Bool` is at least `(1/2)(k − \|range x\|)/k` for any fixed sample-index pattern `x : Fin n → K` (`nfl_finite_k_adversary`), and averaging again over uniform `x : Fin n → K` recovers the classical DGL bound `(1/2)(1 − 1/k)^n` (`nfl_finite_k_dgl_average`). The proof uses a bit-flip involution on labelings together with the coordinate-wise factorization of the unsampled-point indicator. This PR replaces #39167 (withdrawn), which provided only the algebraic core; reviewers requested the measure-theoretic version, which this PR provides via a finite-`k` measurable adversary on `Fintype K` together with the standard `(1 − 1/k)^n` average-over-`x` computation. --- ## AI-assistance disclosure Per the Mathlib [AI-use policy](https://leanprover-community.github.io/contribute/index.html#use-of-ai): - Tool. Claude Code (Anthropic) with the Claude Sonnet 4.6 model. - Use. I specified the target lemma statements and the proof strategy; the assistant drafted Lean 4 tactic combinations against current Mathlib. I iterated on the proofs, verified each lemma builds under `lake build` from a clean checkout, and read the final code. - Vouching. I have read every declaration in `Mathlib/Probability/NoFreeLunch.lean` and can defend the proofs without further AI assistance. I welcome reviewer feedback on naming, namespace placement, and stylistic alignment with the surrounding Mathlib modules.	t-measure-probability new-contributor LLM-generated	570/0	Mathlib.lean,Mathlib/Probability/NoFreeLunch.lean	2	2	['github-actions']	nobody	0-38918 10 hours ago	0-40184 11 hours ago	0-40177 11 hours
39399	Brian-Nugent author:Brian-Nugent	feat(Algebra/CategoryTheory/ModuleCat): Locally Free Sheaves	This PR gives a definition of locally free sheaves in terms of first defining a predicate IsLocallyFree for [SheafOfModules.LocalGeneratorsData](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.html#SheafOfModules.LocalGeneratorsData). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory label:t-algebra$	207/5	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/LocallyFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean	4	10	['Brian-Nugent', 'github-actions', 'robin-carlier']	nobody	0-36853 10 hours ago	0-36899 10 hours ago	3-77291 3 days
39366	akiezun author:akiezun	feat(Data/Nat): add prime divisibility for ascFactorial and choose	Adds two prime-divisibility lemmas for natural-number factorial/binomial APIs. The first characterizes when a prime divides an ascending factorial: `Nat.Prime.dvd_ascFactorial_iff`. The second applies this to binomial coefficients: `Nat.Prime.dvd_choose_add_sub_one_iff`, using `Nat.ascFactorial_eq_factorial_mul_choose'` and cancellation of the `n!` factor when `n < p`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor large-import	46/0	Mathlib.lean,Mathlib/Data/Nat/Choose/Consecutive.lean,Mathlib/Data/Nat/Factorial/BigOperators.lean	3	9	['SnirBroshi', 'akiezun', 'github-actions', 'wwylele']	nobody	0-36806 10 hours ago	0-38847 10 hours ago	4-49219 4 days
31613	xyzw12345 author:xyzw12345	feat(RepresentationTheory/GroupCohomology): Non-abelian Group Cohomology	In this PR, we develop the theory of non-abelian group cohomology, following the section in GTM 67 - Local Fields by Jean-Pierre Serre. We defined H0 and H1, constructed the connection maps, proved the long exact sequence, and constructed natural isomorphisms between our H0, H1 and the existing `groupCohomology` API. Co-authored by: Jiedong Jiang @jjdishere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	610/1	Mathlib.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/NonAbelian.lean	3	11	['eric-wieser', 'github-actions', 'kbuzzard', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536', 'xyzw12345']	eric-wieser assignee:eric-wieser	0-35830 9 hours ago	90-48652 90 days ago	35-32011 35 days
39538	b-mehta author:b-mehta	feat(Data/Finset/SDiff): add sdiff_subset_sdiff_left and sdiff_subset_sdiff_right	These two lemmas are provided for convenience in term mode. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data maintainer-merge	6/0	Mathlib/Data/Finset/SDiff.lean	1	6	['b-mehta', 'github-actions', 'themathqueen']	nobody	0-35319 9 hours ago	0-39694 11 hours ago	0-42369 11 hours
39542	allenhaozhu author:allenhaozhu	feat(Probability/Distance): Bretagnolle-Huber bridge via Hellinger affinity	Add `MeasureTheory.tvDist_sq_le_one_sub_exp_neg_of_bhattacharyya` and `MeasureTheory.tvDist_sq_le_one_sub_exp_neg_of_hellinger`, the Bretagnolle–Huber bridge `tvDist² μ ν ≤ 1 - exp(-D)` discharged from the Bhattacharyya affinity `ρ` (equivalently the squared Hellinger distance `H² = 2(1 - ρ)`) and a helper `exp_neg_le_sq_of_exp_neg_half_le` for squaring the Jensen-style lower bound `exp(-D/2) ≤ ρ`. This PR replaces #39166 (withdrawn), which provided only the algebraic core; reviewers requested the measure-theoretic version, which this PR supplies via the standard Bhattacharyya/Hellinger affinity chain. Depends on #39164 (`tvDist`). --- ## AI-assistance disclosure Per the Mathlib [AI-use policy](https://leanprover-community.github.io/contribute/index.html#use-of-ai): - Tool. Claude Code (Anthropic) with the Claude Sonnet 4.6 model. - Use. I specified the target lemma statements and the proof strategy; the assistant drafted Lean 4 tactic combinations against current Mathlib. I iterated on the proofs, verified each lemma builds under `lake build` from a clean checkout, and read the final code. - Vouching. I have read every declaration in this file and can defend the proofs without further AI assistance. I welcome reviewer feedback on naming, namespace placement, and stylistic alignment with the surrounding Mathlib modules.	t-measure-probability new-contributor LLM-generated	329/0	Mathlib.lean,Mathlib/Probability/Distance/Hellinger.lean,Mathlib/Probability/Distance/TotalVariation.lean	3	2	['github-actions']	nobody	0-34407 9 hours ago	0-36027 10 hours ago	0-36020 10 hours
39477	wwylele author:wwylele	chore(LinearAlgebra/Ray): remove a defeq abuse	Previously, the code uses Subtype constructor to construct RayVector, and the instance cannot see through this. As a common practice, RayVector declares its own constructor to resolve this --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra tech debt maintainer-merge label:t-algebra$	14/4	Mathlib/LinearAlgebra/Ray.lean	1	6	['Vierkantor', 'github-actions', 'robin-carlier', 'wwylele']	nobody	0-34234 9 hours ago	0-34234 9 hours ago	2-6646 2 days
39543	jvanwinden author:jvanwinden	feat(MeasureTheory/Measure/Tight): portmanteau condition for compact sets	One part of the portmanteau theorem states that a limsup condition for closed sets implies weak convergence of probability measures. In the situation where the measures are tight however, one only needs to check the limsup condition for compact sets. This PR thus introduces `tendsto_of_forall_isCompact_of_isTightMeasureSet`, which is a version of [tendsto_of_forall_isClosed_limsup_le](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Measure/Portmanteau.html#MeasureTheory.tendsto_of_forall_isClosed_limsup_le) but replaces `IsClosed` with `IsCompact`, under the additional hypothesis that the measures are tight. I would have liked to put this lemma in MeasureTheory/Portmeanteau, but this created an import cycle. I am open to suggestions for where it could otherwise be moved. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	27/0	Mathlib/MeasureTheory/Measure/Tight.lean	1	1	['github-actions']	nobody	0-33970 9 hours ago	0-34045 9 hours ago	0-34038 9 hours
39544	Brian-Nugent author:Brian-Nugent	chore(Algebra/CategoryTheory/ModuleCat): generalize universe parameter in `LocalGeneratorsData`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory easy label:t-algebra$	15/3	Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.lean	1	1	['github-actions']	nobody	0-33898 9 hours ago	0-33985 9 hours ago	0-33978 9 hours
34361	grunweg author:grunweg	chore: rename comp' to fun_comp a few more times; use to_fun to autog…	…enerate -------- - [x] depends on: #34257 (then this PR can be done the proper way) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	18/42	Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Calculus/DifferentialForm/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Comp.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Meromorphic/Basic.lean	5	10	['JovanGerb', 'github-actions', 'grunweg', 'mathlib-dependent-issues']	nobody	0-33704 9 hours ago	0-33657 9 hours ago	0-45466 12 hours
39462	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): more API for PairingCore	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	56/3	Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean	3	4	['github-actions', 'joelriou', 'robin-carlier']	robin-carlier assignee:robin-carlier	0-33264 9 hours ago	0-33264 9 hours ago	2-11049 2 days
39084	scholzhannah author:scholzhannah	feat: generalize `OpenPartialHomeomorph.Defs` file to `PartialHomeomorph`	As discussed on Zulip ([#mathlib4 > Generalizing `PartialHomeomorph`?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generalizing.20.60PartialHomeomorph.60.3F/with/536896273)), I renamed `PartialHomeomorph` to `OpenPartialHomeomorph` in #29113. In this PR I now add a new `PartialHomeomorph` which is a `PartialEquiv` that is continuous on both source and target. An `OpenPartialHomeomorph` is then a `PartialHomeomorph` that additionally has open source and target. In subsequent PRs I will generalize the other files. See this draft PR (#39071) for what I think the end result might be. `PartialHomeomorph` should find uses at least for manifolds (`ModelWithCorners`). Afterwards, I want to add a `ClosedPartialHomeomorph` to use for CWComplexes. --- I don't have a lot of experience doing these kind of modifications of a large piece of code. Additionally, I am not familiar with the main uses of `OpenPartialHomeomorph` in Mathlib. So while I did this to the best of my abilities, you should read this carefully because there might be things I did wrong or in non-ideal ways. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	330/79	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/OpenPartialHomeomorph/Basic.lean,Mathlib/Topology/OpenPartialHomeomorph/Composition.lean,Mathlib/Topology/OpenPartialHomeomorph/Constructions.lean,Mathlib/Topology/OpenPartialHomeomorph/Defs.lean,Mathlib/Topology/OpenPartialHomeomorph/IsImage.lean,Mathlib/Topology/PartialHomeomorph/Defs.lean	23	19	['github-actions', 'grunweg', 'j-loreaux', 'scholzhannah']	grunweg and j-loreaux assignee:j-loreaux assignee:grunweg	0-32801 9 hours ago	0-51438 14 hours ago	8-4774 8 days
37584	kennethgoodman author:kennethgoodman	feat(Data/Nat/Fib): formalize Lamé's theorem	## Summary Formalize [Lamé's theorem](https://en.wikipedia.org/wiki/Lam%C3%A9%27s_theorem) (1844), the founding result of computational complexity theory. Lamé's Theorem: If the Euclidean algorithm on inputs `(a, b)` with `b ≤ a` takes `n + 1` division steps, then `b ≥ fib(n + 1)` and `a ≥ fib(n + 2)`. ### New definitions - `Nat.euclidSteps`: counts the number of division steps in the Euclidean algorithm on natural number inputs. ### New theorems - `Nat.fib_le_of_euclidSteps`: the main Lamé bound — Fibonacci lower bound on inputs given a step count. - `Nat.euclidSteps_le_of_lt_fib`: the contrapositive — step count upper bound given a Fibonacci bound on the smaller input. - `Nat.add_mod_le`: helper lemma that `b + a % b ≤ a` when `b ≤ a` and `0 < b`. ### Proof strategy Induction on `n`, tracking both elements of the pair. The key insight is that each Euclidean step replaces `(a, b)` with `(b, a % b)`, and since `a ≥ b + a % b` (because `a / b ≥ 1`), the Fibonacci recurrence `fib(n+3) = fib(n+2) + fib(n+1)` matches the structure of the algorithm. ### References - Gabriel Lamé, Note sur la limite du nombre des divisions dans la recherche du plus grand commun diviseur entre deux nombres entiers, Comptes rendus de l'Académie des sciences, 1844. --- ### AI usage disclosure Per the [Mathlib AI guidelines](https://leanprover-community.github.io/contribute/index.html#use-of-ai): Claude Code (Claude Opus 4.6) was used to assist with writing the Lean 4 proof code, fixing tactic errors, and drafting this PR description. The mathematical proof (induction on step count, tracking both pair elements through the Fibonacci recurrence) was designed by hand and verified on paper before formalization. I have reviewed and understand every line of the resulting Lean code and can explain all proof steps. --- - [x] builds cleanly (`lake build Mathlib.Data.Nat.Fib.Lame`) - [x] no `sorry` - [x] lines ≤ 100 characters, no trailing whitespace - [x] `autoImplicit false` - [x] docstrings on all public declarations	new-contributor LLM-generated t-data merge-conflict	121/0	Mathlib.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Fib/Lame.lean,docs/1000.yaml	5	25	['euprunin', 'github-actions', 'kennethgoodman', 'mathlib-merge-conflicts', 'vihdzp', 'wwylele']	TwoFX assignee:TwoFX	0-32579 9 hours ago	0-32580 9 hours ago	44-66371 44 days
33958	chrisflav author:chrisflav	feat(AlgebraicGeometry): the small affine étale site	We define the small affine étale site of a scheme `S`. The underlying category is the category of commutative rings `R` equipped with an étale structure morphism `Spec R ⟶ S`. This category is essentially small (in contrast to the full small étale site). We show that it has the same category of sheaves as the small étale site of `S` and deduce from this that étale sheafification of presheaves with values in `Type u` exists and that the category of sheaves on the étale site with values in a Grothendieck abelian category is Grothendieck abelian. In particular, this allows us to define the étale cohomology groups of a sheaf with values in `Ab.{u}` to be in `Type u`. From Proetale. Co-authored-by: Joël Riou --- - [x] depends on: #35711 - [x] depends on: #35240 - [x] depends on: #34976 - [x] depends on: #33957 - [x] depends on: #38820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry delegated	266/1	Mathlib.lean,Mathlib/AlgebraicGeometry/LimitsOver.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Sites/Affine.lean,Mathlib/AlgebraicGeometry/Sites/AffineEtale.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	6	26	['chrisflav', 'github-actions', 'joelriou', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'robin-carlier']	kim-em assignee:kim-em	0-32306 8 hours ago	0-32307 8 hours ago	16-71792 16 days
38993	CBirkbeck author:CBirkbeck	feat(NumberTheory/ModularForms): Sturm bound for level-1 modular forms	The Sturm bound for level 1: a modular form `f : ModularForm 𝒮ℒ k` whose q-expansion has order strictly greater than `k / 12` is identically zero. Also restates `dimension_level_one` more cleanly using `Nat.ModEq` and `k / 12`, and adds a small `CuspForm.discriminantEquiv` API needed by the proof. - [x] depends on: #38806 This PR was done with the help of Claude Code.	t-number-theory LLM-generated awaiting-author	142/42	Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/CuspFormSubmodule.lean,Mathlib/NumberTheory/ModularForms/LevelOne/DimensionFormula.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	4	66	['CBirkbeck', 'MichaelStollBayreuth', 'github-actions', 'grunweg', 'loefflerd', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-31760 8 hours ago	0-31760 8 hours ago	6-49368 6 days
39008	MichaelStollBayreuth author:MichaelStollBayreuth	feat(NumberTheory/NumberField/Completion/FinitePlace): add multiplicity lemmas	This adds some more API for multiplicities of prime ideals in factorizations (and some more basic API lemmas, too), in preparation for a proof of the Northcott property for heights on number fields. --- - [x] depends on: #38654 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	52/0	Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean	3	26	['MichaelStollBayreuth', 'github-actions', 'mathlib-dependent-issues', 'tb65536']	tb65536 assignee:tb65536	0-30498 8 hours ago	4-41103 4 days ago	7-67460 7 days
38415	yuanyi-350 author:yuanyi-350	chore: kill 100 `erw`s	Still open - [ ] depends on: #38725 - [ ] depends on: #38762 - [ ] depends on: #38764 - [ ] depends on: #38766 - [ ] depends on: #38916 - [ ] depends on: #38917 - [ ] depends on: #38918 - [ ] depends on: #38922 Fixed - [ ] depends on: #38418 - [ ] depends on: #38417 - [ ] depends on: #38501 - [ ] depends on: #38502 - [ ] depends on: #38503 - [ ] depends on: #38504 - [ ] depends on: #38505 - [ ] depends on: #38506 - [ ] depends on: #38508 - [ ] depends on: #38514 - [ ] depends on: #38515 - [ ] depends on: #38516 - [ ] depends on: #38517 - [ ] depends on: #38518 - [ ] depends on: #38519 - [ ] depends on: #38520 - [ ] depends on: #38521 - [ ] depends on: #38522 - [ ] depends on: #38644 - [ ] depends on: #38645 - [ ] depends on: #38675 - [ ] depends on: #38676 - [ ] depends on: #38677 - [ ] depends on: #38678 - [ ] depends on: #38679 - [ ] depends on: #38680 - [ ] depends on: #38681 - [ ] depends on: #38682 - [ ] depends on: #38683 - [ ] depends on: #38684 - [ ] depends on: #38685 - [ ] depends on: #38686 - [ ] depends on: #38687 - [ ] depends on: #38688 - [ ] depends on: #38689 - [ ] depends on: #38690 - [ ] depends on: #38724 - [ ] depends on: #38726 - [ ] depends on: #38727 - [ ] depends on: #38728 - [ ] depends on: #38734 - [ ] depends on: #38735 - [ ] depends on: #38736 - [ ] depends on: #38737 - [ ] depends on: #38738 - [ ] depends on: #38761 - [ ] depends on: #38763 - [ ] depends on: #38765 - [ ] depends on: #38767 - [ ] depends on: #38768 - [ ] depends on: #38769 - [ ] depends on: #38770 - [ ] depends on: #38771 - [ ] depends on: #38772 - [ ] depends on: #38773 - [ ] depends on: #38774 - [ ] depends on: #38912 - [ ] depends on: #38913 - [ ] depends on: #38914 - [ ] depends on: #38915 - [ ] depends on: #38919 - [ ] depends on: #38920 - [ ] depends on: #38921 - [ ] depends on: #38923 - [ ] depends on: #38924 - [ ] depends on: #38925 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	60/58	Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafification.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/AlgebraicTopology/DoldKan/GammaCompN.lean,Mathlib/CategoryTheory/CatCommSq.lean,Mathlib/CategoryTheory/Comma/Basic.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean,Mathlib/CategoryTheory/Preadditive/Mat.lean,Mathlib/CategoryTheory/Triangulated/Pretriangulated.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean	14	13	['Whysoserioushah', 'github-actions', 'leanprover-radar', 'loefflerd', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'yuanyi-350']	nobody	0-30450 8 hours ago	23-76830 23 days ago	1-1966 1 day
39356	TentativeConvert author:TentativeConvert	pushforward of gradings along map between indexing sets	Pushforward of grading along map between indexing sets The main result of #36501 is that the quotient of a graded algebra by a homogeneous relation inherits a grading. This draft complements #36501 with the result that the grading on a graded algebra can be changed by "pushing forward" along an additive map of additive monoids. For example, an ℕ-grading can be turned into a ℤ-grading by pushing forward along the inclusion ℕ → ℤ, or collapsed to an even/odd-grading by pushing forward along the projection ℤ → ZMod 2. This result is currently in [`RingTheory/GradedAlgebra/Map/DecompositionMap_SetLike.lean`](https://github.com/TentativeConvert/mathlib4/blob/f4e54e0ec25f44c5d373e355e9926481e3102ccd/Mathlib/RingTheory/GradedAlgebra/Map/DecompositionMap_SetLike.lean). The changes to [`Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean`](https://github.com/TentativeConvert/mathlib4/blob/f4e54e0ec25f44c5d373e355e9926481e3102ccd/Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean) illustrate how the two results can be combined to give a new construction of the grading on the Clifford algebra: First, the grading on the tensor algebra is collapsed to an even/odd grading. With respect to this grading, the Clifford relation is homogeneous. The Clifford algebra is the quotient of the tensor algebra by the Clifford relation, so we obtain an induced grading on the Clifford algebra. Notes: This draft includes all of #36501, as this is necessary to demonstrate the application to Clifford algebras. Most of the changes shown below are from that PR. (I don't know how to include that PR and highlight only the changes made on top of it here.) --- - [ ] depends on: #36501 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry new-contributor blocked-by-other-PR merge-conflict	1097/46	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/Data/DFinsupp/BigOperators.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Conjugation.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorAlgebra/Grading.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/GradedAlgebra/Map/AddSubmonoidSSup.lean,Mathlib/RingTheory/GradedAlgebra/Map/DecompositionMap_SetLike.lean,Mathlib/RingTheory/GradedAlgebra/Map/Tests.lean,Mathlib/RingTheory/GradedAlgebra/Map/auxiliary.lean,Mathlib/RingTheory/Ideal/Span.lean	20	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-30084 8 hours ago	unknown	0-0 0 seconds
39357	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the pushout-product of a mono and an anodyne extension is an anodyne extension	Co-authored-by: Jack McKoen --- - [ ] depends on: #39466 - [ ] depends on: #39464 - [ ] depends on: #39298 - [ ] depends on: #39462 - [ ] depends on: #39463 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP blocked-by-other-PR large-import merge-conflict	455/12	Mathlib.lean,Mathlib/AlgebraicTopology/RelativeCellComplex/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PushoutProduct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CategoryWithFibrations.lean,Mathlib/AlgebraicTopology/SimplicialSet/PushoutProduct.lean,Mathlib/CategoryTheory/Adjunction/ParametrizedLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackObjObj.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Braided.lean,Mathlib/CategoryTheory/SmallObject/TransfiniteCompositionLifting.lean	10	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-30082 8 hours ago	4-67249 4 days ago	0-2 2 seconds
38823	matthewjasper author:matthewjasper	chore(LinearAlgebra/TensorProduct): fix diamond in `AddCommGroup` instance	The `SMul` instance for tensor products directly used `AddCon.lift`, so wasn't type correct at instance transparency. This caused a diamond with the `AddCommGroup` instance on tensor products because after unfolding some types didn't match, so I've wrapped the sMul function in a semireducible def to prevent this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	30/23	Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean	2	6	['dagurtomas', 'github-actions', 'kbuzzard', 'leanprover-radar']	nobody	0-29554 8 hours ago	17-26478 17 days ago	17-26471 17 days
39549	Hagb author:Hagb	feat(Order/RelIso/Basic): `swap`s and `compl`s are `Equiv`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	13/8	Mathlib/Order/RelIso/Basic.lean	1	3	['Hagb', 'github-actions', 'leanprover-radar']	nobody	0-29142 8 hours ago	0-31583 8 hours ago	0-31576 8 hours
39281	YaelDillies author:YaelDillies	feat(RingTheory): convolution product on bialgebra homs	Construct the ring structure on algebra homs `C → A` where `C` is a bialgebra and `A` an algebra, and also the ring structure on bialgebra homs `C → A` where `C` and `A` are bialgebras. From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	196/1	Mathlib.lean,Mathlib/RingTheory/Bialgebra/Convolution.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean	3	42	['YaelDillies', 'github-actions', 'kbuzzard', 'riccardobrasca', 'themathqueen']	nobody	0-29012 8 hours ago	0-50017 13 hours ago	4-81741 4 days
39507	sgouezel author:sgouezel	chore: remove useless `[NumberField K]` typeclass assumption	Noticed while tweaking instance priorities in #39471 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory easy maintainer-merge	4/2	Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean	1	6	['MichaelStollBayreuth', 'github-actions', 'sgouezel']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-28845 8 hours ago	0-30072 8 hours ago	1-15538 1 day
39421	harahu author:harahu	chore: add empty lines after headers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1253/0	Archive/Imo/Imo1998Q2.lean,Archive/Imo/Imo2001Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Counterexamples/PeanoCurve.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Epi.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/CharAndCard.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/EuclideanDomain/Int.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeMonoid/FreeSemigroup.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Subgroup/MulOpposite.lean,Mathlib/Algebra/Group/Subgroup/MulOppositeLemmas.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Lemmas.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Membership.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/TStructure.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/Embedding/HomEquiv.lean,Mathlib/Algebra/Homology/Embedding/StupidTrunc.lean,Mathlib/Algebra/Homology/Embedding/TruncGE.lean,Mathlib/Algebra/Homology/Functor.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/KInjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/KProjective.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/ModelCategory/Injective.lean,Mathlib/Algebra/Homology/Opposite.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Homology/SpectralObject/Basic.lean,Mathlib/Algebra/Homology/SpectralObject/Cycles.lean,Mathlib/Algebra/Homology/SpectralObject/Differentials.lean,Mathlib/Algebra/Homology/SpectralObject/EpiMono.lean,Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Cochain.lean,Mathlib/Algebra/Lie/Extension.lean,Mathlib/Algebra/Lie/Loop.lean,Mathlib/Algebra/Lie/Prod.lean,Mathlib/Algebra/Lie/Semisimple/Lemmas.lean,Mathlib/Algebra/Lie/SerreConstruction.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/Weights/IsSimple.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Lie/Weights/Linear.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/RestrictScalars.lean,Mathlib/Algebra/Module/SnakeLemma.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/Module/StablyFree/Basic.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean	877	2	['github-actions', 'mathlib-merge-conflicts']	nobody	0-28260 7 hours ago	unknown	0-0 0 seconds
39508	mcdoll author:mcdoll	chore(Algebra/Module): rename multiplication lemmas and add `push/pull_end` attributes	The renaming makes this file consistent with `Equiv.Perm`, where the custom `simp` set was first used. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	59/50	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Central/End.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Star/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Data/Matrix/Bilinear.lean,Mathlib/LinearAlgebra/Charpoly/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/FiniteCyclic.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	28	2	['github-actions', 'mathlib-merge-conflicts']	nobody	0-28259 7 hours ago	0-86269 23 hours ago	0-2572 42 minutes
38957	wwylele author:wwylele	chore(GroupTheory/DivisibleHull): remove `backward.privateInPublic`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-group-theory	5/12	Mathlib/GroupTheory/DivisibleHull.lean	1	9	['Komyyy', 'github-actions', 'grunweg', 'jcommelin', 'wwylele']	jcommelin assignee:jcommelin	0-27630 7 hours ago	8-7104 8 days ago	13-52279 13 days
39552	themathqueen author:themathqueen	chore(RingTheory/Bialgebra/Hom): `toCoalgHom` as prefix for `simps`	There are currently no generated `simps` lemmas for these, so this is a straightforward change. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	1/1	Mathlib/RingTheory/Bialgebra/Hom.lean	1	1	['github-actions']	nobody	0-27620 7 hours ago	0-27693 7 hours ago	0-28050 7 hours
39553	Brian-Nugent author:Brian-Nugent	feat(Algebra/CategoryTheory/ModuleCat): Locally Free is local	We define `SheafOfModules.LocalGeneratorsData.bind` just like `SheafOfModules.QuasicoherentData.bind` and use it to show that being locally free is a local condition. --- - [ ] depends on: #39544 - [ ] depends on: #39399 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	281/8	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/LocallyFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-27552 7 hours ago	0-27553 7 hours ago	0-1165 19 minutes
38906	lua-vr author:lua-vr	feat(ConditionallyCompleteLattice/Indexed): add binary versions of lemmas	Add binary versions of some of the lemmas. Those are useful when the domain is indexed over the members of a set. From the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order carleson	22/1	Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	1	18	['JovanGerb', 'SnirBroshi', 'github-actions', 'grunweg', 'lua-vr', 'mathlib-merge-conflicts']	nobody	0-26973 7 hours ago	0-56688 15 hours ago	9-60313 9 days
39410	RaggedR author:RaggedR	feat(RingTheory/HopfAlgebra): Hopf algebra structure on polynomials (𝔾ₐ)	This work is the beginning of a formalization of the first half of my masters thesis. https://arxiv.org/abs/0907.3950 In particular we look at the ring of polynomials in a single variable with the usual multiplication and coproduct given by: Δ(X) = X ⊗ 1 + 1 ⊗ X. The counit is evaluation at zero, and the antipode is S(x) = -x. Claude Code was used extensively in the development of the Lean proofs, however the mathematics itself comes from my masters thesis (and is well known). This is a first step towards an implementation of the umbral calculus of Gian-Carlo Rota and then its generalization to Symmetric Functions (which I believe is original). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor LLM-generated	264/0	Mathlib.lean,Mathlib/RingTheory/HopfAlgebra/Polynomial.lean	2	7	['RaggedR', 'github-actions', 'wwylele']	nobody	0-26819 7 hours ago	3-54682 3 days ago	3-55049 3 days
39465	RaggedR author:RaggedR	feat(RingTheory/HopfAlgebra): delta operators and Rota's classification	## Summary This PR formalizes the fundamental theorem of the umbral calculus: that the basic sequence of any delta operator is a sequence of binomial type. A delta operator on R[X] is a shift-equivariant linear operator which is essentially a formal power series in the variable d/dx. Rota's classification theorem states that the images of monomials x^n under delta operators are sequences of binomial type. This PR defines `IsBinomialType`, `IsShiftEquivariant`, `IsDeltaOperator`, `forwardDiff`, and `IsBasicSequence`. It proves that monomials and falling factorials are of binomial type, that the derivative and forward difference are delta operators, and that basic sequences are of binomial type (Rota's classification). The mathematical content is from the first half of my masters thesis: https://arxiv.org/abs/0907.3950 ## References - Rota, G.-C., Kahaner, D., Odlyzko, A., Finite Operator Calculus, JMAA 42 (1973) - Roman, S., The Umbral Calculus, Academic Press, 1984 - Langer, R., Macdonald Polynomials and Symmetric Functions, arXiv:0907.3950, §1.2.2 ## AI disclosure This PR was developed with assistance from Claude Code. The mathematical content and proof strategies are mine. --- - [ ] depends on: #39410	t-ring-theory new-contributor blocked-by-other-PR LLM-generated	1386/0	Mathlib.lean,Mathlib/RingTheory/HopfAlgebra/BinomialType.lean,Mathlib/RingTheory/HopfAlgebra/DeltaOperator.lean,Mathlib/RingTheory/HopfAlgebra/Polynomial.lean	4	6	['RaggedR', 'github-actions', 'mathlib-dependent-issues', 'wwylele']	nobody	0-26803 7 hours ago	2-50552 2 days ago	0-727 12 minutes
39498	RaggedR author:RaggedR	feat(RingTheory/HopfAlgebra): umbral operators via generating functions	## Umbral operators via generating functions This PR completes the formalization of the finite operator calculus on `R[X]` over a ℚ-algebra. The entire umbral calculus — every theorem, every lemma, zero sorry's — is now machine-checked, from the coalgebra axioms (PR #39410) through Rota's classification (PR #39465) to the umbral operator and its duality theory. Given a delta operator `Q` on `R[X]`, the delta series `f(y) = Σ (Q(X^k)).eval 0 / k! · y^k` is a formal power series with zero constant term and unit linear coefficient. Its compositional inverse `g` (obtained via Mathlib's `substInvOfIsUnit`) encodes the basic sequence: the polynomial `p_n` has coefficients `(p_n).coeff k = descFact(n, n-k) · [y^n](g^k)`. The umbral operator `U_Q` is the linear extension of `X^n ↦ p_n`. The key result is the lowering property `Q(p_{n+1}) = (n+1) • p_n`. The proof uses the natural duality of the finite operator calculus — the derivative pairing `⟨h, p⟩ = Σ_k coeff_k(h) · k! · p.coeff k` between `R⟦X⟧` and `R[X]`. Under this pairing, Q's adjoint is multiplication by f (proved via the convolution formula for power series coefficients), orthogonality gives `⟨f^k, p_n⟩ = n! · δ_{kn}` (from the Jabotinsky matrix identity), and non-degeneracy closes it (upper-triangular with unit diagonal, by descending induction). Three lines of mathematics, backed by a clean chain of lemmas. Once lowering is established, `umbralPoly_isBasicSequence` follows immediately, and `IsBasicSequence.isBinomialType` (from #39465) gives the coalgebra endomorphism property — completing the circle back to the Hopf algebra structure. References: Langer, Macdonald Polynomials and Symmetric Functions (arXiv:0907.3950), §1.2.2; Roman, The Umbral Calculus, Academic Press 1984, Ch. 2. Depends on #39410, #39465. LLM disclosure: AI assistance (Claude) was used in developing this formalization.	t-ring-theory new-contributor LLM-generated	2141/0	Mathlib.lean,Mathlib/RingTheory/HopfAlgebra/BinomialType.lean,Mathlib/RingTheory/HopfAlgebra/DeltaOperator.lean,Mathlib/RingTheory/HopfAlgebra/Polynomial.lean,Mathlib/RingTheory/HopfAlgebra/UmbralOperator.lean	5	3	['RaggedR', 'github-actions']	nobody	0-26790 7 hours ago	1-61046 1 day ago	1-62209 1 day
39530	RaggedR author:RaggedR	feat(Combinatorics/SimpleGraph): group actions on simple graphs	This adds the first connection between Mathlib's MulAction and SimpleGraph libraries. The GraphAction class asserts that a group action on the vertex type preserves the adjacency relation, and builds on it to define vertex-transitivity and arc-transitivity for graphs. The GraphAction typeclass gives adj_smul_iff (the biconditional for group actions) and toIso (each group element induces a graph automorphism). The IsVertexTransitive class combines GraphAction with IsPretransitive, and IsArcTransitive requires transitivity on ordered adjacent pairs (arcs). The main theorem is the standard characterization: a graph is arc-transitive if and only if it is vertex-transitive and locally transitive (the stabilizer of each vertex acts transitively on its neighbors). The forward direction is proved directly by composing a vertex-transporting element with a neighbor-transporting stabilizer element. The reverse direction shows that an arc-transitive graph with no isolated vertices is vertex-transitive. These definitions are the algebraic graph theory prerequisites for formalizing coset graphs (Sabidussi's construction) and the characterization of symmetric graphs via double cosets and involutions (Lorimer's theorem).	t-combinatorics new-contributor LLM-generated	130/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Action.lean	2	4	['RaggedR', 'b-mehta', 'github-actions']	nobody	0-26768 7 hours ago	0-32091 8 hours ago	0-32411 9 hours
39548	RaggedR author:RaggedR	feat(Combinatorics/SimpleGraph): coset graphs (Sabidussi construction)	This adds coset graphs (Sabidussi's construction) to Mathlib, building on the graph action infrastructure from #39530. Given a group `G`, a subgroup `H`, and a connection set `D` (a union of `(H,H)`-double cosets, closed under inversion, disjoint from `H`), the coset graph `Sab(G, H, D)` is the simple graph on `G ⧸ H` where `xH` is adjacent to `yH` whenever `x⁻¹y ∈ D`. The well-definedness proof — that adjacency is independent of coset representatives — uses the double coset stability of `D`. This is the core algebraic content of the construction. The file then shows that left multiplication by `G` preserves adjacency (`graphAction` instance) and that coset graphs are vertex-transitive. Sabidussi's construction generalizes Cayley graphs (which are the special case `H = ⊥`). Together with the representation theorem (a future PR), it gives a complete classification: every vertex-transitive graph is isomorphic to a coset graph. ## Depends on #39530 ## AI disclosure The definitions and proofs are from my honours thesis (Symmetric Graphs and their Quotients, arXiv:1306.4798). The Lean formalization was developed collaboratively with Claude Code (Anthropic's coding assistant), which helped with tactic selection, Mathlib API navigation, and porting the mathematical content into idiomatic Lean 4. All mathematical content was verified by me and the proofs compile without sorry.	t-combinatorics new-contributor LLM-generated	259/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Action.lean,Mathlib/Combinatorics/SimpleGraph/CosetGraph.lean	3	2	['github-actions']	nobody	0-26756 7 hours ago	0-31675 8 hours ago	0-31668 8 hours
39550	RaggedR author:RaggedR	feat(Combinatorics/SimpleGraph): Sabidussi representation theorem	This proves Sabidussi's representation theorem: every vertex-transitive graph is isomorphic to a coset graph. The proof constructs, for any basepoint `v` in a graph with a transitive graph action, an explicit graph isomorphism `Γ ≃g Sab(G, Gᵥ, D)` where `Gᵥ` is the stabilizer of `v` and `D = {g ∈ G : Γ.Adj v (g • v)}` is the connection set. The connection set `D` is shown to satisfy the `IsConnectionSet` axioms for the stabilizer subgroup: it is stable under left and right multiplication by stabilizer elements (since the stabilizer fixes `v` and the action preserves adjacency), closed under inversion (since the graph is undirected), and disjoint from the stabilizer (since the graph has no loops). The orbit-stabilizer equivalence `V ≃ G ⧸ Gᵥ` is then shown to preserve adjacency in both directions, completing the isomorphism. Together with the coset graph construction from #39548, this gives a complete classification of vertex-transitive graphs up to isomorphism. ## Depends on #39548 ## AI disclosure The definitions and proofs are from my honours thesis (Symmetric Graphs and their Quotients, arXiv:1306.4798). The Lean formalization was developed collaboratively with Claude Code (Anthropic's coding assistant), which helped with tactic selection, Mathlib API navigation, and porting the mathematical content into idiomatic Lean 4. All mathematical content was verified by me and the proofs compile without sorry.	t-combinatorics new-contributor LLM-generated	423/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Action.lean,Mathlib/Combinatorics/SimpleGraph/CosetGraph.lean,Mathlib/Combinatorics/SimpleGraph/Representation.lean	4	2	['github-actions']	nobody	0-26748 7 hours ago	0-30352 8 hours ago	0-30787 8 hours
39551	RaggedR author:RaggedR	feat(Combinatorics/SimpleGraph): Lorimer's theorem and quotient graphs	This completes the algebraic theory of symmetric graphs by proving Lorimer's theorem (both directions) and the Lorimer quotient theorem, building on the Sabidussi representation theorem from #39550. Lorimer's theorem characterizes symmetric (arc-transitive) graphs in terms of coset graphs. The forward direction shows that `Sab(G, H, HaH)` is arc-transitive whenever `a` is an involution not in `H`. The proof establishes local transitivity at the identity coset by exploiting the double coset decomposition of neighbors, then transports it to all vertices by conjugation. The reverse direction shows that every arc-transitive graph's connection set is a single double coset `GᵥaGᵥ`, where `a` is the element swapping an arc `(v, w)`. This `a` satisfies `a ∉ Gᵥ` and `a² ∈ Gᵥ`. The quotient theorem shows that the quotient of `Sab(G, H, D)` by an overgroup `K ≥ H` (with `D ∩ K = ∅`) is isomorphic to `Sab(G, K, KDK)` where `KDK` is the expanded connection set. The isomorphism is witnessed by `Equiv.refl` — the quotient graph and the coset graph with expanded connection set are the same graph up to the identity map on `G ⧸ K`. Together with #39530, #39548, and #39550, this gives a complete formalization of Chapters 1–2 of arXiv:1306.4798. ## Depends on #39550 ## AI disclosure The definitions and proofs are from my honours thesis (Symmetric Graphs and their Quotients, arXiv:1306.4798). The Lean formalization was developed collaboratively with Claude Code (Anthropic's coding assistant), which helped with tactic selection, Mathlib API navigation, and porting the mathematical content into idiomatic Lean 4. All mathematical content was verified by me and the proofs compile without sorry.	t-combinatorics new-contributor LLM-generated	755/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Action.lean,Mathlib/Combinatorics/SimpleGraph/CosetGraph.lean,Mathlib/Combinatorics/SimpleGraph/QuotientGraph.lean,Mathlib/Combinatorics/SimpleGraph/Representation.lean,Mathlib/Combinatorics/SimpleGraph/Symmetric.lean	6	2	['github-actions']	nobody	0-26730 7 hours ago	0-29114 8 hours ago	0-30025 8 hours
39364	Vierkantor author:Vierkantor	chore(Tactic): update `tauto` and `tauto_set` tactic docs	This PR updates the docstrings for the `tauto` and `tauto_set` tactics, as follows: * First say that they solve tautologies (expressed in propositional logic and elementary set theory respectively), instead of listing a bunch of operators, * Clarify that they either close the goal or fail, * Remove the mention of Lean 3 since we have been on Lean 4 for years now. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation t-meta maintainer-merge	8/6	Mathlib/Tactic/Tauto.lean,Mathlib/Tactic/TautoSet.lean	2	4	['JovanGerb', 'github-actions', 'grunweg']	JovanGerb assignee:JovanGerb	0-26637 7 hours ago	4-49856 4 days ago	4-49849 4 days
39554	grunweg author:grunweg	feat: add and use custom (d)elaborators for `mvfderiv`, add basic API lemmas	Add a custom elaborator (scoped to the `Manifold` namespace) shortening `mvfderiv I f` to `d% f`, and have a corresponding delaborator also. Their implementation is fully analogous to the existing elaborators. Also, rewrite Lie bracket lemmas to use `mvfderiv` instead of open-coding it. Part of #36036, i.e. from the path towards the Levi-Civita connection and Riemanian curvature. Related to fixing defeq abuses related to tangent space and scalar multiplication in mathlib. Co-authored-by: Heather Macbeth [25316162+hrmacbeth@users.noreply.github.com](mailto:25316162+hrmacbeth@users.noreply.github.com) Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-differential-geometry	94/25	Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean	3	4	['github-actions', 'grunweg']	nobody	0-24934 6 hours ago	0-25245 7 hours ago	0-25238 7 hours
39433	JovanGerb author:JovanGerb	feat(Tactic): `#click_suggestions`	This is an initial PR for a point&click suggestion tool that can suggest theorems and tactics. This PR only implements theorem suggestions. This PR adds the `#click_suggestions` command that activates the tool. It could potentially in the future be active by default. The code is ported from this repository: https://github.com/JovanGerb/infoview_search TODO: import this feature in Tactic.Common This PR deletes `unfold?` in favour of the `#click_suggestions`. For backwards compatability, I have left `rw??` in place, but I plan to deprecate it in the future. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-meta	2151/120	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ClickSuggestions.lean,Mathlib/Tactic/ClickSuggestions/Apply.lean,Mathlib/Tactic/ClickSuggestions/ApplyAt.lean,Mathlib/Tactic/ClickSuggestions/FindPremises.lean,Mathlib/Tactic/ClickSuggestions/GRewrite.lean,Mathlib/Tactic/ClickSuggestions/Rewrite.lean,Mathlib/Tactic/ClickSuggestions/SectionState.lean,Mathlib/Tactic/ClickSuggestions/TryPremises.lean,Mathlib/Tactic/ClickSuggestions/Unfold.lean,Mathlib/Tactic/ClickSuggestions/Util.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,MathlibTest/ClickSuggestions/Benchmark.lean,MathlibTest/ClickSuggestions/Test.lean,MathlibTest/ClickSuggestions/TestImpl.lean,MathlibTest/ClickSuggestions/Unfold.lean	17	14	['JovanGerb', 'fpvandoorn', 'github-actions']	fpvandoorn assignee:fpvandoorn	0-24703 6 hours ago	0-24328 6 hours ago	0-12070 3 hours
39541	b-mehta author:b-mehta	feat(Data/Finset/Powerset): add results about powersetCard	These are useful for set family combinatorics --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	20/0	Mathlib/Data/Finset/Powerset.lean	1	1	['github-actions']	nobody	0-24503 6 hours ago	0-24576 6 hours ago	0-26916 7 hours
39545	Hagb author:Hagb	feat(Order/OrderIsoNat): some lemmas about `((· < ·) : ℕ → ℕ → Prop) ↪r r`	This PR contains several lemmas about relation embedding from `<` in `Nat`, well order, and (in)finiteness. - `RelEmbedding.infinite_iff_nonempty_relEmbedding_of_isWellOrder`: a type with a well order relation is infinite iff there is such a relation embedding. - `RelEmbedding.finite_iff_empty_relEmbedding_of_isWellOrder`: a finite variant of `infinite_iff_nonempty_relEmbedding_of_isWellOrder` - `IsWellOrder.finite_of_isWellOrder_of_isWellOrder_swap`: a type with a linear order relation well founded on both directions is finite. - `instFiniteOfWellFoundedLTOfWellFoundedGT`: an instance variant of `IsWellOrder.finite_of_isWellOrder_of_isWellOrder_swap` on `WellFounded{LT,GT}`. - `RelEmbedding.infinite_iff_nonempty_relEmbedding_lt_or_nonempty_relEmbedding_gt`: a type with a linear order relation is infinite iff there are both relation embedding between `<` in `Nat` and this relation, and between `>` in `Nat` and this relation. - `RelEmbedding.finite_iff_isEmpty_relEmbedding_lt_and_isEmpty_relEmbedding_gt`: a finite variant of `infinite_iff_nonempty_relEmbedding_lt_or_nonempty_relEmbedding_gt`. `RelEmbedding.finite_iff_empty_relEmbedding_of_isWellOrder` might be used for proof of ```lean example {α β γ} [LinearOrder α] [LinearOrder β] [WellFoundedLT α] [WellFoundedLT β] [LinearOrder γ] {f : α × β ≃ γ} (mono : Monotone f) : WellFoundedLT γ := sorry ``` The latter will be used for ```lean example {α β γ} [Finite α] [LinearOrder β] [WellFoundedLT β] [LinearOrder γ] {f : (α → β) ≃ γ} (mono : Monotone f) : WellFoundedLT γ := sorry ``` And the finial goal is the well-foundedness of monomial order when the index type `σ` is finite (under the definition in #39214). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	89/0	Mathlib/Order/OrderIsoNat.lean	1	8	['Hagb', 'SnirBroshi', 'github-actions', 'leanprover-radar', 'vihdzp']	nobody	0-23814 6 hours ago	0-32562 9 hours ago	0-32555 9 hours
39513	grunweg author:grunweg	feat: add `mvfderivWithin` with (d)elaborators and basic API	Add `mvfderivWithin` (a version of `mvfderiv` within a set) and add analogues of all `mvfderiv` lemmas. We also add analogous custom elaborators and delaborators. To prove our set-up works, we re-phrase two lemmas in `VectorField/LieBracket.lean` to use this definition, instead of open-coding it. Part of https://github.com/leanprover-community/mathlib4/pull/36036, i.e. from the path towards the Levi-Civita connection and Riemanian curvature. Related to fixing defeq abuses related to tangent space and scalar multiplication in mathlib. --- - [x] depends on: #39485 - [x] depends on: #34257 - [ ] depends on: #39554 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	290/34	Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-23398 6 hours ago	0-28258 7 hours ago	0-28037 7 hours
39547	Hagb author:Hagb	chore(Order/Preorder/Finite): use `@[to_dual]` on lemmas about `{Min,Max}imal{For,}`	Proofs of other theorems with dual theorems dependent on these lemmas would benefit from their duality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/25	Mathlib/Order/Preorder/Finite.lean	1	3	['github-actions', 'vihdzp']	nobody	0-23067 6 hours ago	0-32004 8 hours ago	0-31997 8 hours
39555	b-mehta author:b-mehta	feat(Data/Finset/Image): relate images with nontriviality	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	20/0	Mathlib/Data/Finset/Image.lean	1	1	['github-actions']	nobody	0-22682 6 hours ago	0-22760 6 hours ago	0-22753 6 hours
36299	grunweg author:grunweg	feat: metric connections	This file defines what it means for a connection on a Riemannian vector bundle `(V, g)` to be compatible with the metric `g`. Namely, the differentiated metric tensor `∇ g` (defined by `(X, σ, τ) ↦ X g(σ, τ) - g(∇_X σ, τ) - g(σ, ∇_X τ)`) should vanish on all differentiable vector fields `X` and differentiable sections `σ`, `τ`. From the path towards the Levi-Civita connection and Riemannian geometry. Co-authored-by: Heather Macbeth [25316162+hrmacbeth@users.noreply.github.com](mailto:25316162+hrmacbeth@users.noreply.github.com) Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- WIP: after the pre-requisite PRs below have been merged, update this PR with the current state on #36036. Then it will be ready for review again. - [x] depends on: #36279 - [x] depends on: #34263 - [x] depends on: #39485 - [ ] depends on: #39554 - [ ] depends on: #39513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry merge-conflict blocked-by-other-PR	296/0	Mathlib.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Metric.lean	3	23	['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'or4nge19', 'sgouezel']	nobody	0-22137 6 hours ago	73-23227 73 days ago	0-10 10 seconds
36036	grunweg author:grunweg	[placeholder PR uniting ongoing work on connections and geodesics]	--- - [x] depends on: #34263 - [x] depends on: #36277 - [x] depends on: #36279 - [x] depends on: #36285 - [ ] depends on: #36299 - [x] depends on: #37537 - [x] depends on: #34257 - [x] depends on: #39226 - [x] depends on: #39451 - [x] depends on: #39485 - [ ] depends on: #39554 - [ ] depends on: #39513 - [x] depends on: #39486 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry blocked-by-other-PR merge-conflict	4843/69	Mathlib.lean,Mathlib/Geometry/Manifold/CheatSheet.md,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/Riemannian/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/ContMDiffSection.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/ChristoffelSymbols.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Curvature.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Ehresmann.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Geodesics.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/IntegralCurvePrelim.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/LeviCivita.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Lift.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Metric.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Prelim.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Torsion2.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/TrivPrelim.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Trivial.lean,Mathlib/Geometry/Manifold/VectorBundle/GramSchmidtOrtho.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/OrthonormalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/Geometry/Manifold/VectorBundle/Unused.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean	28	9	['github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-20992 5 hours ago	76-67456 76 days ago	0-7 7 seconds
39506	b-mehta author:b-mehta	feat(Data/Complex/Basic): add simproc to reduce powers of I	This is enabled by default to make eg i^5 simplify automatically. We intentionally require the exponent to be a numeral, as this is intended to be a reduction statement, and for symbolic `n`, the lemma `I_pow_eq_pow_mod` should be used instead. Note that we can't have `I_pow_eq_pow_mod` as a simp lemma due to looping. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	65/5	Mathlib/Algebra/Group/Defs.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Data/Complex/Basic.lean,MathlibTest/Simproc/IPow.lean	5	12	['Paul-Lez', 'b-mehta', 'eric-wieser', 'github-actions']	nobody	0-20668 5 hours ago	0-20739 5 hours ago	1-44434 1 day
37523	matthewjasper author:matthewjasper	feat: elements of Dedekind domain approximate elements of valuation ring	Algebra part of showing that `R` is dense in `O_v` which is used to show that `R / v` is isomorphic to the residue field of `O_v` and construct the base change isomorphism for finite adeles. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	87/11	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	2	5	['github-actions', 'mathlib-merge-conflicts', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	0-20355 5 hours ago	0-18450 5 hours ago	45-43230 45 days
39556	b-mehta author:b-mehta	feat(Data/Finset): add InjOn variants of image_{subset,eq}_image_iff	These are useful for set family combinatorics --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy t-data	18/0	Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Powerset.lean	2	1	['github-actions']	nobody	0-20205 5 hours ago	0-20280 5 hours ago	0-20273 5 hours
39557	b-mehta author:b-mehta	feat(Data/Finset/Range): add strictMono_range	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy t-data	3/0	Mathlib/Data/Finset/Range.lean	1	1	['github-actions']	nobody	0-20172 5 hours ago	0-20246 5 hours ago	0-20239 5 hours
28613	espottesmith author:espottesmith	feat(Combinatorics): define undirected hypergraphs	This PR defines undirected hypergraphs: ``` @[ext] structure Hypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The hyperedge set -/ hyperedgeSet : Set (Set α) /-- All hyperedges must be subsets of the vertex set -/ hyperedge_isSubset_vertexSet : ∀ ⦃e⦄, e ∈ hyperedgeSet → e ⊆ vertexSet ``` In addition to the main definition, some additional definitions and related lemmas are provided: - vertex adjacency - hyperedge adjacency - vertex "stars" - special cases (loops, empty hypergraphs, trivial hypergraphs, complete hypergraphs, simple hypergraphs, k-uniform hypergraphs, and d-regular hypergraphs) - (some) hypergraph cardinality - subhypergraphs, induced subhypergraphs, and partial hypergraphs This implementation is certainly bare-bones. I'm submitting this PR at this point, rather than when my developments are more fleshed out, because there has been some interest in others contributing to hypergraph formalization in mathlib. In the near future, goals include: - defining incidence matrices (i.e., conversion from `Hypergraph α` to `Matrix α (Set α) β` - coersion/generalization of graph as 2-uniform hypergraph - conversion of a hypergraph into its associated clique graph/two-section graph - constructing the dual of a hypergraph (note: on first blush, this appears somewhat challenging, given that we define hyperedges as `Set α` rather than some other type `β`) - rank and co-rank - walks, paths, cycles, etc. on hypergraphs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	277/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	150	['SnirBroshi', 'b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot', 'tb65536']	b-mehta assignee:b-mehta	0-19988 5 hours ago	0-19988 5 hours ago	94-73810 94 days
35790	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory/AlgebraicGeometry): Flasque Sheaves have vanishing cohomology	Proves cohomology vanishing for flasque sheaves. --- - [x] depends on: #34742 - [x] depends on: #34267 - [x] depends on: #35785 - [ ] depends on: #36218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	367/2	Mathlib.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/ExactSequences.lean,Mathlib/Topology/Sheaves/AddCommGrpCat.lean,Mathlib/Topology/Sheaves/Flasque.lean,Mathlib/Topology/Sheaves/Sheaf.lean	8	10	['Brian-Nugent', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smorel394']	dagurtomas assignee:dagurtomas	0-19729 5 hours ago	82-13524 82 days ago	0-23 23 seconds
38220	wwylele author:wwylele	feat(LinearAlgebra/AffineSpace): shifting a subspace towards a point	Split off from #36018 and excluded the Simplex part. This is preparing to calculate the volume of a simplex by integrating the cross-section created by shifting the base plane. Part of https://github.com/leanprover-community/mathlib4/pull/34826. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	133/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean	2	7	['alreadydone', 'copilot-pull-request-reviewer', 'github-actions', 'themathqueen', 'wwylele']	alreadydone assignee:alreadydone	0-19724 5 hours ago	8-52055 8 days ago	30-26962 30 days
39488	urkud author:urkud	feat: generalize `HasFDerivAt.of_local_left_inverse` etc	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	229/84	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/OfCompLeft.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/FDeriv.lean	6	1	['github-actions']	nobody	0-19264 5 hours ago	0-19337 5 hours ago	0-19530 5 hours
35017	robo7179 author:robo7179	feat(Combinatorics/SimpleGraph/Acyclic): every nontrivial tree has at least two leaves	Add two theorems to prove that every non trivial tree has at least two leaves (one in Finite the other in Acyclic). --- - [ ] depends on: #37399 - [ ] depends on: #37400 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author blocked-by-other-PR	24/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	2	44	['IvanRenison', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robo7179']	YaelDillies assignee:YaelDillies	0-18269 5 hours ago	62-43611 62 days ago	35-3753 35 days
39459	yuanyi-350 author:yuanyi-350	feat(NumberTheory/GaussSum): add shift and conjugation lemmas		t-number-theory	16/0	Mathlib/NumberTheory/GaussSum.lean	1	3	['github-actions', 'loefflerd']	loefflerd assignee:loefflerd	0-17932 4 hours ago	0-17951 4 hours ago	2-79552 2 days
37968	yuanyi-350 author:yuanyi-350	refactor(Analysis): golf 100 files	This PR is an experimental project. In this PR, we use an Agent to automatically scan and attempt to simplify proofs. We hope to eventually effectively golf 100 files and avoid reinventing the wheel in mathlib. We have chosen `Mathlib/Analysis` as the testing ground. If this experiment is very successful and accepted by the mathlib community, we would be honored to open source it. The relevant projects includes - [ ] #38104, which golfs `Mathlib/MeasureTheory`. - [ ] #38144, which golfs `Mathlib/NumberTheory`. This PR serves as an index. For the actual code review, please refer to the individual PRs linked below. Each of those PRs modifies only a single file to facilitate the review process. - [ ] depends on: #37555 - [ ] depends on: #37731 - [ ] depends on: #37737 - [ ] depends on: #37754 - [ ] depends on: #37785 - [ ] depends on: #37788 - [ ] depends on: #37821 - [ ] depends on: #37876 - [ ] depends on: #37981 - [ ] depends on: #37987 - [ ] depends on: #37989 - [ ] depends on: #37991 - [ ] depends on: #38006 - [ ] depends on: #38010 - [ ] depends on: #38272 - [ ] depends on: #38273 - [ ] depends on: #38274 - [ ] depends on: #38352 - [ ] depends on: #38404 - [ ] depends on: #38435 - [ ] depends on: #38436 - [ ] depends on: #38437 - [ ] depends on: #38493 - [ ] depends on: #38513 - [ ] depends on: #38638 - [ ] depends on: #38646 - [ ] depends on: #39171 - [ ] depends on: #39182 - [ ] depends on: #39183 - [ ] depends on: #39184 - [ ] depends on: #39187 - [ ] depends on: #39188 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	codex WIP t-analysis LLM-generated large-import blocked-by-other-PR	412/883	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Analytic/Within.lean,Mathlib/Analysis/AperiodicOrder/Delone/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/ExpGrowth.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/Unitization.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/OperatorNorm.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Asymptotic.lean,Mathlib/Analysis/Complex/ValueDistribution/LogCounting/Basic.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/Birkhoff.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Lp/SmoothApprox.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/ContinuousInverse.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Module/MultipliableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/RieszLemma.lean,Mathlib/Analysis/Normed/Operator/Bilinear.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/ContinuousLinearMap.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/Normed/Operator/Mul.lean,Mathlib/Analysis/Normed/Operator/NNNorm.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Analysis/Normed/Unbundled/AlgebraNorm.lean,Mathlib/Analysis/Normed/Unbundled/FiniteExtension.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromBounded.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/PoissonSummation.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Log/RpowTendsto.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean	72	25	['CoolRmal', 'Parcly-Taxel', 'euprunin', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen', 'yuanyi-350']	nobody	0-17762 4 hours ago	36-12589 36 days ago	0-26 26 seconds
38104	yuanyi-350 author:yuanyi-350	refactor(MeasureTheory): golf 100 files	This PR is an experimental project. In this PR, we use an Agent to automatically scan and attempt to simplify proofs. We hope to eventually effectively golf 100 files and avoid reinventing the wheel in mathlib. We have chosen `Mathlib/MeasureTheory` as the testing ground. If this experiment is very successful and accepted by the mathlib community, we would be honored to open source it. The relevant projects includes - [ ] #37968, which golfs `Mathlib/Analysis`. - [ ] #38144 , which golfs `Mathlib/NumberTheory`. This PR serves as an index. For the actual code review, please refer to the individual PRs linked below. Each of those PRs modifies only a single file to facilitate the review process. - [ ] depends on: #38350 - [ ] depends on: #38353 - [ ] depends on: #38455 - [ ] depends on: #38456 - [ ] depends on: #38492 - [ ] depends on: #38636 - [ ] depends on: #38639 - [ ] depends on: #38640 - [ ] depends on: #38872 - [ ] depends on: #38873 - [ ] depends on: #38874 - [ ] depends on: #38875 - [ ] depends on: #38876 - [ ] depends on: #38877 - [ ] depends on: #38878 - [ ] depends on: #38879 - [ ] depends on: #38880 - [ ] depends on: #38881 - [ ] depends on: #38882 - [ ] depends on: #38883 - [ ] depends on: #38884 - [ ] depends on: #38885 - [ ] depends on: #38886 - [ ] depends on: #39172 - [ ] depends on: #39173 - [ ] depends on: #39174 - [ ] depends on: #39175 - [ ] depends on: #39176 - [ ] depends on: #39177 - [ ] depends on: #39178 - [ ] depends on: #39179 - [ ] depends on: #39180 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability codex LLM-generated blocked-by-other-PR	127/317	Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Function/AEMeasurableOrder.lean,Mathlib/MeasureTheory/Function/AEMeasurableSequence.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/Asymptotics.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction/Basic.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean	19	9	['github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'yuanyi-350']	kex-y assignee:kex-y	0-17746 4 hours ago	15-57293 15 days ago	4-44505 4 days
38144	yuanyi-350 author:yuanyi-350	refactor(NumberTheory): Golf 100 files	This PR is an experimental project. In this PR, we use an Agent to automatically scan and attempt to simplify proofs. We hope to eventually effectively golf 100 files and avoid reinventing the wheel in mathlib. We have chosen `Mathlib/NumberTheory` as the testing ground. If this experiment is very successful and accepted by the mathlib community, we would be honored to open source it. The relevant projects includes - [ ] #38104, which golfs `Mathlib/MeasureTheory`. - [ ] #37968, which golfs `Mathlib/Analysis`. This PR serves as an index. For the actual code review, please refer to the individual PRs linked below. Each of those PRs modifies only a single file to facilitate the review process. - [ ] depends on: #38204 - [ ] depends on: #38277 - [ ] depends on: #38278 - [ ] depends on: #38279 - [ ] depends on: #38280 - [ ] depends on: #38351 - [ ] depends on: #38402 - [ ] depends on: #38403 - [ ] depends on: #38454 - [ ] depends on: #38457 - [ ] depends on: #38494 - [ ] depends on: #38495 - [ ] depends on: #38832 - [ ] depends on: #38833 - [ ] depends on: #38834 - [ ] depends on: #38835 - [ ] depends on: #38836 - [ ] depends on: #38838 - [ ] depends on: #38839 - [ ] depends on: #39372 - [ ] depends on: #39373 - [ ] depends on: #39374 - [ ] depends on: #39375 - [ ] depends on: #39376 - [ ] depends on: #39377 - [ ] depends on: #39378 - [ ] depends on: #39379 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory large-import codex LLM-generated blocked-by-other-PR	67/181	Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/NumberTheory/DiophantineApproximation/Basic.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/EulerProduct/Basic.lean,Mathlib/NumberTheory/FLT/Four.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/GaussSum.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/NumberTheory/ModularForms/Derivative.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/PrimeCounting.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/SmoothNumbers.lean	15	11	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536', 'yuanyi-350']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-17727 4 hours ago	4-45985 4 days ago	3-39923 3 days
39522	urkud author:urkud	feat: define `WithTopology` structure	`WithTopology X t` is a 1-field structure wrapper around `X` with topology coinduced from `t`. Define the structure, transfer some instances to it, and port `CofiniteTopology` to use it. ### AI usage disclosure First draft of `Topology/WithTopology.lean` was written by Gemini. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	249/26	Mathlib.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/WithTopology.lean	9	22	['SnirBroshi', 'eric-wieser', 'github-actions', 'j-loreaux', 'plp127', 'urkud']	nobody	0-16990 4 hours ago	0-18767 5 hours ago	0-44729 12 hours
39559	b-mehta author:b-mehta	feat(Data/Finset/Prod): add Equiv.Finset.prod	The choice of simp lemmas and `simps` setup is chosen here to match `Equiv.Set.prod`, for consistency. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	8/0	Mathlib/Data/Finset/Prod.lean	1	3	['b-mehta', 'github-actions', 'wwylele']	nobody	0-16154 4 hours ago	0-20079 5 hours ago	0-20072 5 hours
39098	BoltonBailey author:BoltonBailey	chore(Data/Vector): add `grind` to cons lemmas	This PR affects `List.Vector.head_cons` and `List.Vector.tail_cons`. It moves the simp attribute assignment of these lemmas to the lemma declarations and also applies the `grind =` attribute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/2	Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean	2	4	['BoltonBailey', 'github-actions', 'leanprover-radar']	nobody	0-15804 4 hours ago	0-15878 4 hours ago	9-29501 9 days
38840	peabrainiac author:peabrainiac	feat(Topology): continuous germs of maps	Add a predicate `Filter.Germ.Continuous` for continuity of germs between topological spaces, and bundled types `ContinuousGerm x Y` / `PointedContinuousGerm x y` of continuous germs at `x` resp. continuous germs at `x` taking `x` to `y`. --- See also #10977, which tried to introduce smooth germs between manifolds a while ago, though with a focus on pointwise algebraic operations instead of composability. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	171/1	Mathlib.lean,Mathlib/Topology/ContinuousGerm.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Germ.lean	4	6	['chrisflav', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'peabrainiac']	ADedecker assignee:ADedecker	0-15264 4 hours ago	0-15299 4 hours ago	12-50058 12 days
39058	vihdzp author:vihdzp	chore: `IsBotZeroClass (Fin n)`	We also deprecate a bunch of theorems that now follow from the typeclass. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	32/28	Archive/Imo/Imo2024Q5.lean,Mathlib/AlgebraicTopology/Quasicategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/Logic/Equiv/Fin/Rotate.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/Order/Grade.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean	13	14	['Komyyy', 'github-actions', 'plp127']	Komyyy assignee:Komyyy	0-14161 3 hours ago	11-9999 11 days ago	11-15433 11 days
31587	JovanGerb author:JovanGerb	Lean pr testing 11156	Testing the performance improvement given by not deleting cache so often when modifying the environment. cf. https://github.com/leanprover/lean4/pull/11156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	5932/1306	.github/workflows/build_template.yml,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2024Q6.lean,Cache/IO.lean,Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Adjunction.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafification.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/MonCat/Yoneda.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Ring/Under/Basic.lean,Mathlib/Algebra/Category/Ring/Under/Limits.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Nat/Even.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/GroupWithZero/Action/Faithful.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/AlternatingConst.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorAssociator.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/CochainComplexOpposite.lean,Mathlib/Algebra/Homology/CochainComplexPlus.lean,Mathlib/Algebra/Homology/CommSq.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExactSequences.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean	1425	5	['JovanGerb', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	0-13792 3 hours ago	186-47780 186 days ago	0-13411 3 hours
36814	YaelDillies author:YaelDillies	refactor(Combinatorics/SimpleGraph): no proof obligation in `rotate`	If the walk doesn't go through the new vertex, return `nil` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	44/31	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	8	8	['SnirBroshi', 'YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	nobody	0-13670 3 hours ago	45-69474 45 days ago	59-53295 59 days
29744	espottesmith author:espottesmith	feat(Combinatorics): define directed hypergraphs	This PR defines directed hypergraphs: ``` @[ext] structure DiHypergraph (α : Type*) where /-- The vertex set -/ vertexSet : Set α /-- The edge set -/ edgeSet : Set ((Set α) × (Set α)) /-- Each edge is a pair (s, d), where s ⊆ vertexSet and d ⊆ vertexSet -/ edge_src_dst_isSubset_vertexSet' : ∀ ⦃e⦄, e ∈ edgeSet → e.1 ⊆ vertexSet ∧ e.2 ⊆ vertexSet ``` Additional definitions: - tail/head stars and negative/positive stars - some special cases (B-Graph, F-Graph, BF-Graph, and what I'm calling a "non-endless" dihypergraph, where neither the source/tail nor the destination/head are empty) - Vertex and (hyper)edge adjacency - isolated vertices - empty and nonempty dihypergraphs The design employed here is based off of #28613, but this PR does not depend on that one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	398/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	4	['b-mehta', 'espottesmith', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	0-13669 3 hours ago	45-69454 45 days ago	103-52914 103 days
33928	jsm28 author:jsm28	feat(Combinatorics/Tiling/TileSet): indexed families of tiles	Define the type `TileSet` for indexed families of tiles (in a discrete context), and some associated definitions (including `symmetryGroup`) and API lemmas. `TileSet` can be used for tilings of the whole space; for tilings of part of the space; for patches of tiles (extracted from a tiling by considering tiles meeting some set of points, or considered on their own without extracting from a tiling); for multiple tilings (covering the space more than once). In particular, the fact that people study multiple tilings provides a clear justification for using indexed families rather than sets of tiles, and basic definitions and API lemmas generally work for all these different uses of `TileSet` (sometimes with weak constraints such as tiles being finite, nonempty and only having finitely many tiles meeting any point of the space). Definitions for saying e.g. "this `TileSet` is a tiling of the whole space" are to be included in subsequent files in subsequent PRs. From AperiodicMonotilesLean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	460/0	Mathlib.lean,Mathlib/Combinatorics/Tiling/TileSet.lean	2	23	['Parcly-Taxel', 'b-mehta', 'eric-wieser', 'github-actions', 'jsm28', 'vihdzp']	nobody	0-13668 3 hours ago	125-30776 125 days ago	125-30769 125 days
36274	JTylM author:JTylM	feat(Combinatorics/SimpleGraph/Matching): implemented the matchingNumber of a graph	--- - [ ] depends on: #36406 - [ ] depends on: #32555 I implemented the matchingNumber as described in the issue and proved some statements including showing that there exists a matching achieving the matchingNumber. matchingNumber is increasing under injective maps matchingNumber is equal under isomorphisms matchingNumber of a matching is the cardinality of the matching This is my first PR and i had some trouble with some of the proofs, especially with the proof for matchingNumber.isAttained. So any suggestions on how to make the proofs shorter would be welcome. Also i was not sure about the naming of some of the theorems so i would apprechiate feedback here as well.	new-contributor t-combinatorics blocked-by-other-PR merge-conflict	292/2	Mathlib/Combinatorics/SimpleGraph/Matching.lean	1	40	['JTylM', 'SnirBroshi', 'SproutSeeds', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vlad902']	nobody	0-12429 3 hours ago	60-52496 60 days ago	9-69432 9 days
31222	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): `Hom` commute with flat base change	In this PR, we proved `Hom_S (M \tensor S, N \tensor S)` is base change of `Hom_R (M, N)` with respect to `LinearMap.baseChangeHom`. Co-authored-by: Wang Jingting --- - [x] depends on: #31218 - [x] depends on: #31219 - [x] depends on: #31696 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	49/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	5	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	0-12205 3 hours ago	18-22228 18 days ago	18-22487 18 days
37443	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk/Operations): permutations of support	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	17/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	6	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts']	b-mehta assignee:b-mehta	0-12203 3 hours ago	7-71461 7 days ago	47-56730 47 days
37618	WenrongZou author:WenrongZou	feat(PowerSeries): rename a power series as multivariate power series	--- In this PR, I define the `PowerSeries.toMvPowerSeries` which use `Polynomial.toMvPolynomial` as reference. Also there is some missing APIs in `MvPowerSeries/Equiv.lean` with respect to `MvPolynomial/Equiv.lean`. I will try to add them in next several PRs. - [x] depends on: #37576 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	80/1	Mathlib/RingTheory/MvPowerSeries/Equiv.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	riccardobrasca assignee:riccardobrasca	0-12202 3 hours ago	16-73966 16 days ago	16-75691 16 days
38786	martinwintermath author:martinwintermath	feat(Data/SetLike): add `IsConcreteNeg`	Add file `SetLike/Pointwise.lean` with main definition `class IsConcreteNeg` which expresses that a given `Neg` on a `SetLike` objects is compatible with the injection into sets. This is in analogy to `SetLike.IsConcreteLE`. For demonstration: - we rework negation on `Submodule` to make use of `IsConcreteNeg` - we provide `Neg` in `AffineSubspace` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	185/20	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Data/SetLike/Pointwise.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Pointwise.lean,Mathlib/LinearAlgebra/Span/Basic.lean	6	2	['github-actions', 'mathlib-bors']	TwoFX assignee:TwoFX	0-12201 3 hours ago	13-36475 13 days ago	13-36762 13 days
38826	tb65536 author:tb65536	feat(RingTheory/LocalRing/ResidueField/Fiber): `IsLiesOverAlgebra` instance	We use the new `IsLiesOverAlgebra` predicate from #38465 to express the fact that the existing `R_p`-algebra instance on `(p.Fiber S)_q` agrees with the one coming from the fact that `q` lies over `p`. (The point of this predicate is to avoid exactly this sort of diamond). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	7/1	Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean	1	3	['github-actions', 'robin-carlier', 'tb65536']	riccardobrasca assignee:riccardobrasca	0-12200 3 hours ago	7-43351 7 days ago	17-21422 17 days
39006	tb65536 author:tb65536	feat(Algebra/Field/Subfield/Basic): add definition of finitely generated fields	This PR adds a definition of finitely generated fields with API relating this definition to the existing definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	18/0	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean	3	1	['github-actions']	riccardobrasca assignee:riccardobrasca	0-12199 3 hours ago	12-46386 12 days ago	12-46381 12 days
39027	fpvandoorn author:fpvandoorn	feat: delaborators for inequalities in big operators	`∏ i < n, f i` was already accepted as valid syntax, but this PR now also prints appropriate sums/products using this notation. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/missing.20delaborator.20for.20finsum) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta label:t-algebra$	132/49	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,MathlibTest/BigOps.lean	2	2	['fpvandoorn', 'github-actions']	kim-em assignee:kim-em	0-12198 3 hours ago	0-48995 13 hours ago	0-59591 16 hours
39236	quantumsnow author:quantumsnow	feat(AlgebraicTopology): `HomologyPretheory` for Eilenberg-Steenrod homology	This splits out a part of #38369 into a separate PR. It includes a structure `TopPair.HomologyPretheory` containing the data for an Eilenberg-Steenrod homology theory and the first Eilenberg-Steenrod axiom as a typeclass `EilenbergSteenrod.IsHomotopyInvariant`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor	155/0	Mathlib.lean,Mathlib/AlgebraicTopology/EilenbergSteenrod.lean	2	34	['dagurtomas', 'github-actions', 'joelriou', 'quantumsnow']	robin-carlier assignee:robin-carlier	0-12197 3 hours ago	0-71592 19 hours ago	1-9685 1 day
39359	mathlib-splicebot author:mathlib-splicebot	fix: don't mark `continuous_sigma` as fun_prop	This is a bad `fun_prop` theorem: because of its hypotheses, this would be classified as a transition theorem, and most likely never fire. Extracted from #39337.	t-topology maintainer-merge	3/1	Mathlib/Topology/Constructions.lean	1	7	['JovanGerb', 'github-actions', 'grunweg', 'lecopivo', 'urkud']	alreadydone assignee:alreadydone	0-12195 3 hours ago	4-61803 4 days ago	4-61796 4 days
39380	JonBannon author:JonBannon	feat(Topology/Algebra/Module): add `ClosedComplemented.of_closedComplement_finiteDimensional`	Submodules of finite-dimensional closed, complemented submodules are closed and complemented. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	8/0	Mathlib/Topology/Algebra/Module/FiniteDimension.lean	1	17	['ADedecker', 'JonBannon', 'github-actions', 'mathlib-bors', 'themathqueen']	dagurtomas assignee:dagurtomas	0-12194 3 hours ago	3-22624 3 days ago	3-35522 3 days
39418	tb65536 author:tb65536	feat(Topology/Homeomorph/Defs): group structure on homeomorphisms	This PR defines the group structure on homeomorphisms. The lemmas `one_def`, `inv_def`, `mul_def` could be generated by `@[simps]`, but I suspect we don't want them to be `simp` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/Homeomorph/Defs.lean	1	2	['github-actions', 'themathqueen']	dagurtomas assignee:dagurtomas	0-12193 3 hours ago	3-43941 3 days ago	3-43936 3 days
38789	dupuisf author:dupuisf	feat(UniformOnFun): lemma for proving uniform convergence from uncurried form	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-topology	135/3	Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Isometric.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Topology/Continuous.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean	6	1	['github-actions']	nobody	0-8809 2 hours ago	18-11507 18 days ago	0-2 2 seconds
39520	BryceT233 author:BryceT233	feat(RingTheory/Extension): `cotangentEquivH1Cotangent`	Given `Algebra R S` and an extension `P : Extension R S`, this PR adds a linear equivalence between the cotangent space of `P` and the first homology of the naive cotangent complex of `S` over `P.Ring` . We show that the connecting homomorphism of the Jacobi-Zariski sequence of `R → P.Ring → S` coincides with `P.cotangentComplex` via this equivalence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	62/0	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	2	['github-actions', 'robin-carlier']	chrisflav assignee:chrisflav	0-7118 1 hour ago	1-19693 1 day ago	1-19686 1 day
39558	b-mehta author:b-mehta	feat(Data/Finset/Prod): count the number of ordered pairs in a set	These proofs were written a while ago, so they may be golfable --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	21/0	Mathlib/Data/Finset/Prod.lean	1	2	['github-actions', 'plp127']	nobody	0-6682 1 hour ago	0-20155 5 hours ago	0-20148 5 hours
37008	BryceT233 author:BryceT233	feat(RingTheory/LocalRing): `IsLocalRing` for pullbacks	We provide basic lemmas for equalizers and pullbacks of `RingHom` and `AlgHom`, and show they are local rings under suitable condtions. This is needed in #37940 to construct a residue algebra structure on pullbacks. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	167/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/Pullback.lean	2	6	['BryceT233', 'github-actions', 'wwylele']	riccardobrasca assignee:riccardobrasca	0-6078 1 hour ago	22-21789 22 days ago	56-76535 56 days
39311	felixpernegger author:felixpernegger	refactor: redefine `eLpNorm` at `p = 0`	For Zulip discussion see https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/eLpNorm.20junk.20value/with/576356442. In partuclar this change is suggestion 2 in [#mathlib4 > eLpNorm junk value @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/eLpNorm.20junk.20value/near/576340531) This redefined [MeasureTheory.eLpNorm](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Function/LpSeminorm/Defs.html#MeasureTheory.eLpNorm) at `p = 0`. Previously it was always `0` but now it is the measure of the support of the function (technical detail: In order to avoid having to add additional arguments to `eLpNorm`, we define it as the measure of the support of the norm of the function, but this is almost always the same) The motivation for this comes from the counting measure, in particular this then unifies with https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Lp/lpSpace.html#Mem%E2%84%93p. In any case, it is "closer" to the actual mathematical definition Unfortunately, since `eLpNorm` is widely used, the diff is very large and a lot of theorems break (i.e. now require `p != 0`). Oftentimes `p != 0` is still not required (sometimes with nontrivial arguments), I tried to avoid adding extra hypothesis whenever I could but I almost certainly missed some. There now may also be places where we dont need `p != 0` as a hypothesis anymore (i.e. for `[Memℓp](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Normed/Lp/lpSpace.html#Mem%E2%84%93p)`), but this is not included in this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	893/580	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean,Mathlib/Analysis/Distribution/Sobolev.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/LpSpace.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Lp/SmoothApprox.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Holder.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Indicator.lean,Mathlib/MeasureTheory/Function/LpSeminorm/LpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/LpSeminorm/SMul.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/LpSpace/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Probability/CentralLimitTheorem.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/IdentDistrib.lean,Mathlib/Probability/Kernel/Disintegration/CDFToKernel.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/Moments/SubGaussian.lean,Mathlib/Probability/Process/Filtration.lean,MathlibTest/congr.lean	45	25	['felixpernegger', 'github-actions', 'mathlib-merge-conflicts', 'sgouezel']	nobody	0-5863 1 hour ago	4-69476 4 days ago	0-59698 16 hours
32983	JovanGerb author:JovanGerb	feat: use `LE.le` for subset relation in `Set`, `Finset`, `PSet`, `ZFSet`	This PR allows the use of `⊆` notation while the underlying constant is `≤`. Similarly for `⊂`/`<`, `⊇`/`≥` and `⊃`/`>`. Some notes: - The idea is to later extend this feature to other set notation constants, such as union/intersection. - There are some types for which we cannot use `LE.le` as the underlying constant, because the API has already been developed in core using `HasSubset.Subset`. For example List. So, the elaborator for the `⊆` notation needs to make a decision for which underlying constant to elaborate to, depending on the type. Sometimes the type is not known yet, which makes things awkward. Most of these cases are solved by delaying the elaboration until later when the type is known. However, in some cases this doesn't work either, such as `simp_rw [and_comm (_ ⊆ _)]`, where it is impossible to tell the type when elaborating the term. So, some such cases need to be fixed by making it `simp_rw [and_comm (_ ≤ _)]`. - Dot notation on the `HasSubset.Subset` namespace now doesn't work anymore, and the names need to be put in the `LE.le` namespace instead. - Various `simp` and `gcongr` tags needed to be removed/updated as a result of this change. See also https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Any.20infimum.20based.20version.20of.20.60OmegaCompletePartialOrder.60.3F/near/579333629 --- - [x] depends on: #36633 - [x] depends on: #36734 - [x] depends on: #36782 - [x] depends on: #37012 - [x] depends on: #37347 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-meta large-import	289/435	Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Set.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Group/FunctionSeries.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/CategoryTheory/CofilteredSystem.lean,Mathlib/CategoryTheory/Topos/Sheaf.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/Combinatorics/Hall/Basic.lean,Mathlib/Combinatorics/Matroid/Basic.lean,Mathlib/Combinatorics/Matroid/Constructions.lean,Mathlib/Combinatorics/Matroid/Dual.lean,Mathlib/Combinatorics/Matroid/Rank/Cardinal.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Filter.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Option.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Finset/Sups.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Rat/Star.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Data/Set/FiniteExhaustion.lean,Mathlib/Data/Set/Notation.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Set/Sups.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/Dynamics/FixedPoints/Prufer.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/Lean/Expr/ExtraRecognizers.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Measure/AEDisjoint.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Prokhorov.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Finite.lean,Mathlib/MeasureTheory/Measure/Typeclasses/SFinite.lean,Mathlib/MeasureTheory/SetSemiring.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/BooleanAlgebra/Set.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Filter/AtTopBot/Finset.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/CountableInter.lean,Mathlib/Order/Filter/Ker.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Order/PrimeSeparator.lean,Mathlib/Order/RelClasses.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Spectrum/Prime/Module.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/Tactic/SetNotationForOrder.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/InfiniteSum/SummationFilter.lean,Mathlib/Topology/Algebra/Nonarchimedean/TotallyDisconnected.lean,Mathlib/Topology/Category/TopCat/Limits/Konig.lean,Mathlib/Topology/Compactness/SigmaCompact.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Topology/Order/HullKernel.lean	106	50	['JovanGerb', 'Vierkantor', 'b-mehta', 'eric-wieser', 'github-actions', 'j-loreaux', 'joneugster', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'plp127', 'thorimur']	nobody	0-5429 1 hour ago	0-5499 1 hour ago	6-60561 6 days
39484	rosborn author:rosborn	refactor(GroupTheory/Torsion): make primaryComponent total	Change `primaryComponent` to the `IsPGroup`-style `{g \| ∃ k, g ^ p ^ k = 1}`, making the definitions total over `p : ℕ` without requiring `[Fact p.Prime]`. --- Needed to use `primaryComponent` under a binder where it can't synthesize `[Fact p.Prime]` (e.g., `⨆ p : (Nat.card G).primeFactors, primaryComponent G p.val` and similar family-shaped `iSup` / `Finset.prod` patterns). The new carrier agrees with the previous `{g \| ∃ n, orderOf g = p^n}` on primes, so existing `[Fact p.Prime]` API is unaffected. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60.5BFact.20p.2EPrime.5D.60.20in.20.60CommGroup.2EprimaryComponent.60/with/595535434)	t-group-theory	89/64	Mathlib/GroupTheory/Torsion.lean	1	9	['github-actions', 'rosborn', 'tb65536']	tb65536 assignee:tb65536	0-5218 1 hour ago	0-5218 1 hour ago	1-33489 1 day
38937	zw810-ctrl author:zw810-ctrl	API and proof of `isStrictMap_prodMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor large-import awaiting-author merge-conflict	82/3	Mathlib/Topology/Maps/Strict/Basic.lean	1	13	['ADedecker', 'github-actions', 'mathlib-merge-conflicts', 'zw810-ctrl']	nobody	0-3161 52 minutes ago	9-6581 9 days ago	0-101 1 minute
37997	emlis42 author:emlis42	feat(Algebra/ContinuedFractions): generalize determinant formula to GenContFract	Let $g$ be a `GenContFract K`. In this PR I generalize the determinant formula for continued fractions from the simple continued fraction case $$A_n B_{n+1} - B_n A_{n+1} = (-1)^n$$ to the generalized continued fraction product formula $$A_n B_{n+1} - B_n A_{n+1} = (-a_0) (-a_1) \dots (-a_n)$$ - The `SimpContFract` version is still available unchanged, so this should avoid breaking existing users of the old API. - The use of `0` as the default partial numerator in `(g.partNums.get? i).getD 0` allows product formulation that remains valid when the fraction is terminated.	t-algebra new-contributor large-import label:t-algebra$	53/28	Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Determinant.lean	2	13	['emlis42', 'github-actions', 'themathqueen', 'vihdzp']	ocfnash assignee:ocfnash	0-2333 38 minutes ago	21-47216 21 days ago	35-59426 35 days
38092	SnirBroshi author:SnirBroshi	chore(Order/Defs/Unbundled): deprecate `def Symmetric` in favor of `class Std.Symm`	--- [Mathlib's `def Symmetric`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Defs/Unbundled.html#Symmetric) [Core's `class Std.Symm`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Std.Symm) [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Relation.20properties.20duplication/near/544638270) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	465/408	Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Konigsberg.lean,Counterexamples/HeawoodUnitDistance.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Divisibility/Units.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/Normed/Operator/Compact/FredholmAlternative.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/IsConnected.lean,Mathlib/Combinatorics/Additive/ErdosGinzburgZiv.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Graph/Basic.lean,Mathlib/Combinatorics/Graph/Delete.lean,Mathlib/Combinatorics/Graph/Lattice.lean,Mathlib/Combinatorics/Graph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Dart.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Hall.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/LineGraph.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Tripartite.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/Data/Finset/Pairwise.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Multiset/Pairwise.lean,Mathlib/Data/Multiset/Replicate.lean,Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/Data/Rel/Separated.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/Data/Set/Pairwise/List.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/WSeq/Relation.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/MeasureTheory/Measure/AEDisjoint.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/Order/Antichain.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Preorder/Chain.lean,Mathlib/Order/PropInstances.lean,Mathlib/RingTheory/Coprime/Ideal.lean,Mathlib/RingTheory/Radical/Basic.lean,Mathlib/Topology/CWComplex/Classical/Graph.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/MetricSpace/MetricSeparated.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/GDelta.lean	80	8	['SnirBroshi', 'dagurtomas', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	0-2081 34 minutes ago	0-2120 35 minutes ago	31-74642 31 days
39560	b-mehta author:b-mehta	feat(Order/Filter/AtTopBot/Finset): relate atTop on Finset with Finset.card	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	54/0	Mathlib/Order/Filter/AtTopBot/Finset.lean	1	2	['SnirBroshi', 'github-actions']	nobody	0-1586 26 minutes ago	0-16190 4 hours ago	0-16183 4 hours
39539	yuanyi-350 author:yuanyi-350	feat(NumberTheory): prove Mertens' first theorem	For any natural number $n \geq 2$, the absolute value of the difference between the sum over all primes $p \leq n$ of $\frac{\log p}{p}$ and $\log n$ is at most 2.	WIP	939/0	Mathlib.lean,Mathlib/Analysis/Complex/ExponentialBounds.lean,Mathlib/NumberTheory/Mertens.lean	3	1	['github-actions']	nobody	0-746 12 minutes ago	0-41669 11 hours ago	0-296 4 minutes
39483	hawkrobe author:hawkrobe	feat(RingTheory): cocommutative bialgebra structure on SymmetricAlgebra	Adds the cocommutative coalgebra and bialgebra structure on `SymmetricAlgebra R M` following`MonoidAlgebra` precedent. --- ~~I originally tried to use `Bialgebra.ofAlgHom` but it doesn't make `Coalgebra.comul` defeq for `RingQuot`-built carriers (it looks like the underlying instances were `@[no_expose]` in #32861). So I used explicit `instance ... where` field assignment, then `Bialgebra` via `mk'`, instead.~~ I used Claude Code to help audit/polish this PR. (I've lurked for a long time so I did my best to follow conventions but felt nervous about trying to upstream something stupid!)	t-ring-theory new-contributor	165/0	Mathlib.lean,Mathlib/RingTheory/Bialgebra/SymmetricAlgebra.lean,Mathlib/RingTheory/Coalgebra/SymmetricAlgebra.lean	3	12	['YaelDillies', 'YanYablonovskiy', 'github-actions', 'hawkrobe']	nobody	0-701 11 minutes ago	1-49727 1 day ago	2-20607 2 days
38866	j-mayoral author:j-mayoral	feat(PresentedGroup): free-product of presentations is isomorphic to the presentation of the union (over the disjoint union of generators)	--- Adds the theorem that the free product of presentations is isomorphic to the presentation on the disjoint union of the generators with the union of the relations. That is, `<α \| R₁> * <β \| R₂> ≃* <α ⊕ β \| iα(R₁) ∪ iβ(R₂)>`. Don't know if the current file is the best to add this result. I have the feeling this could be made more elegant, avoiding the need to state lemmas explicitly about the relations of the canonical maps, by instead working with relations on the free product of free groups and then studying how quotienting by relations behaves in terms of isomorphisms. However, that approach is less straightforward, so I prefer to keep the current PR as is and discuss possible refinements there to get better feedback (I’m new and still learning). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-group-theory large-import	65/2	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/GroupTheory/PresentedGroup.lean	2	28	['github-actions', 'j-mayoral', 'kbuzzard', 'tb65536']	tb65536 assignee:tb65536	0-316 5 minutes ago	0-311 5 minutes ago	10-75154 10 days

Other lists of PRs

Some other lists of PRs which could be useful:

all non-draft PRs, not labelled WIP, opened from a branch of the mathlib main repo (and not a fork) --- these should be migrated
all PRs without draft status or 'WIP' label whose title does not start with an abbreviation like 'feat', 'style' or 'perf'
all PRs without draft status or 'WIP' label without a 'CI' or 't-something' label
PRs whose labels are contradictory, such as 'WIP' and 'ready-to-merge'

PRs from a branch of the main mathlib repo

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
13847	alreadydone author:alreadydone	feat(EllipticCurve): the universal elliptic curve	+ Define the universal Weierstrass curve (`Universal.curve`) over the polynomial ring `ℤ[A₁,A₂,A₃,A₄,A₆]`, and the universal pointed elliptic curve (`Universal.pointedCurve`) over the field of fractions (`Universal.Field`) of the universal ring `ℤ[A₁,A₂,A₃,A₄,A₆,X,Y]/⟨P⟩ = Universal.Poly/⟨P⟩` (`Universal.Ring`, where `P` is the Weierstrass polynomial) with distinguished point `(X,Y)`. + Given a Weierstrass curve `W` over a commutative ring `R`, we define the specialization homomorphism `W.specialize : ℤ[A₁,A₂,A₃,A₄,A₆] →+* R`. If `(x,y)` is a point on the affine plane, we define `W.polyEval x y : Universal.Poly →+* R`, which factors through `W.ringEval x y : Universal.Ring →+* R` if `(x,y)` is on `W`. + Introduce the cusp curve `Y² = X³`, on which lies the rational point `(1,1)`, with the nice property that `ψₙ(1,1) = n`, making it easy to prove nonvanishing of the universal `ψₙ` when `n ≠ 0` by specializing to the cusp curve, which shows that `(X,Y)` is a point of infinite order on the universal pointed elliptic curve. --- - [x] depends on: #13845 - [x] depends on: #12883 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-algebraic-geometry label:t-algebra$	543/208	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean	6	4	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74037 1 year ago	unknown	0-0 0 seconds
13297	urkud author:urkud	feat(Semicontinuous): add `comp` lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	31/13	Mathlib/Topology/Semicontinuous.lean	1	3	['sgouezel', 'urkud']	nobody	656-74036 1 year ago	720-74734 720 days ago	0-18201 5 hours
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-meta label:t-algebra$	118/2	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DefaultFieldLinter.lean,scripts/noshake.json,test/default_field_linter.lean	6	12	['YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	656-74035 1 year ago	746-20054 746 days ago	0-84 1 minute
12679	MichaelStollBayreuth author:MichaelStollBayreuth	perf(NumberTheory/RamificationInertia): speed up slow file	A repetition of the earlier experiment at [#12412](https://github.com/leanprover-community/mathlib4/pull/12412) with Lean 4.8.0-rc1. This time, I tried not to introduce local instances if possible, but instead to tweak instance priorities. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	57/14	Mathlib/NumberTheory/RamificationInertia.lean	1	3	['MichaelStollBayreuth', 'github-actions', 'leanprover-bot']	nobody	656-74035 1 year ago	unknown	0-0 0 seconds
13057	alreadydone author:alreadydone	feat(NumberTheory): characterize elliptic divisibility sequences	Main results: + Every `normEDS` is an elliptic divisibility sequence (EDS). The key proof is `rel₄_of_anti_oddRec_evenRec`, based on my original argument first published on [MathSE](https://math.stackexchange.com/a/4903422/12932) + Conversely, every EDS is equal to some `normEDS` (assuming that the first two terms are not zero divisors) --- - [ ] depends on: #13155 - [x] depends on: #13153 - [x] depends on: #10843 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	1032/55	Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Int/Defs.lean,Mathlib/Data/Int/Parity.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	5	6	['Multramate', 'alreadydone', 'kbuzzard', 'leanprover-community-mathlib4-bot']	nobody	656-74035 1 year ago	725-12063 725 days ago	0-34672 9 hours
12192	Ruben-VandeVelde author:Ruben-VandeVelde	feat: generalize isLittleO_const_id_atTop/atBot	From PNT+. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	10/4	Mathlib/Analysis/Asymptotics/Asymptotics.lean	1	6	['Ruben-VandeVelde', 'llllvvuu', 'urkud']	nobody	656-74034 1 year ago	761-9730 761 days ago	1-21749 1 day
10024	ADedecker author:ADedecker	feat: rename `connectedComponentOfOne` to `identityComponent`, prove that it is normal and open	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology awaiting-CI	58/24	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Connected/Basic.lean	5	0	[]	nobody	656-74033 1 year ago	843-66157 843 days ago	0-832 13 minutes
10521	eric-wieser author:eric-wieser	chore: generalize `IsBoundedLinearMap` to modules	Most of the lemmas don't actually need the normed on the scalars at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	58/42	Mathlib/Analysis/NormedSpace/BoundedLinearMaps.lean	1	3	['github-actions', 'j-loreaux', 'urkud']	nobody	656-74033 1 year ago	823-42083 823 days ago	1-29105 1 day
10721	urkud author:urkud	feat(Order/FunLike): define `PointwiseLE`	- introduce a mixin class `DFunLike.PointwiseLE`, use it to define `DFunLike.instPartialOrder`; - add a generic `DFunLike.orderEmbeddingCoe` - add `DFunLike.PointwiseLE` instances here and there. With this refactor and #13022, I'm going to generalize lemmas like `MeasureTheory.ae_mono` to `OuterMeasureClass`. --- - [x] depends on: #12983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order t-logic	123/50	Mathlib.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/GroupTheory/Congruence.lean,Mathlib/Order/FunLike.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Topology/Order/Hom/Basic.lean	13	48	['YaelDillies', 'dupuisf', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	656-74033 1 year ago	706-52435 706 days ago	64-12984 64 days
11100	eric-wieser author:eric-wieser	feat(CategoryTheory/Limits): add `Functor.mapBinaryBiconeInv`	--- - [ ] depends on: #11130 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) It's tempting to try to prove something like ```lean theorem Functor.mapBinaryBiconeInv_toCone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCone = (e.mapConeInv <\| (Cones.postcompose (pairComp X Y e).symm.hom).obj b.toCone) := by simp sorry theorem Functor.mapBinaryBiconeInv_toCocone [Limits.HasZeroMorphisms C] [Limits.HasZeroMorphisms D] (e : D ⥤ C) [IsEquivalence e] {X Y : D} (b : BinaryBicone (e.obj X) (e.obj Y)) : (e.mapBinaryBiconeInv b).toCocone = (e.mapCoconeInv <\| (Cocones.precompose (pairComp X Y e).hom).obj b.toCocone) := by sorry ``` but maybe equality is evil here	merge-conflict t-category-theory awaiting-CI	52/0	Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Biproducts.lean	3	6	['TwoFX', 'eric-wieser', 'leanprover-community-mathlib4-bot']	nobody	656-74033 1 year ago	unknown	0-0 0 seconds
8503	thorimur author:thorimur	feat: meta utils for `refine?`	This PR introduces some metaprogramming infrastructure and utilities that are necessary for `refine?` (#8364). * `elabTermWithHoles'` (and `withCollectingNewGoalsFrom'`): a more configurable version of `elabTermWithHoles`, which allows: preserving the initial mvar type; not tagging untagged goals; and postponing mvars. * Some `Syntax` and `TSyntax` functionality, including: * `TSyntax.map`(`M`), for acting on `TSyntax` with functions `f : Syntax -> (m) Syntax` * Range operations: `includes` and `isEqByRange` * `setTrailingInfoBy?` and `unsetOriginalTrailing`, which is like `unsetTrailing`, but behaves as expected. * `Term.withoutModifyingState`, which does not allow unknown mvarIds to escape via the infotree * `hasNewErrors`, which runs a monad computation and returns the value along with `true` or `false` depending on whether new error messages have been logged * the option `pp.anonymousMVarSuffixes`, which can be set to `false` to replace all numeric suffixes of anonymous mvars with `✝`, which is useful in tandem with `#guard_msgs` for tests (but is essentially a workaround—although it can make some tactic states more legible). --- I'm open to suggestions on the location and name of the option/delaborator used for trimming the numeric suffixes of anonymous mvar names (which is used in the tests)—including whether or not it should exist in the first place, as it's essentially just a workaround. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	312/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean	6	2	['kmill', 'thorimur']	kmill assignee:kmill	656-74032 1 year ago	873-46356 873 days ago	38-46649 38 days
8519	eric-wieser author:eric-wieser	refactor(LinearAlgebra/TensorProduct): golf using `liftAddHom`	This new `TensorProduct.liftAddHom` doesn't require bilinearity, only that scalar multiplication can be moved between the arguments. While in theory we only need the `AddMonoidHom` version as it offers exactly the same generality, we first provide an unbundled `liftFun` as this seems to give a sizeable performance boost if used in downstream `lift` variants. --- - [x] depends on: #8571 - [x] depends on: #8584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	53/50	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	3	28	['bustercopley', 'eric-wieser', 'jcommelin', 'jjaassoonn', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib-bors']	nobody	656-74032 1 year ago	896-39395 896 days ago	5-6524 5 days
8616	eric-wieser author:eric-wieser	feat(Algebra/FreeAlgebra): add right action and `IsCentralScalar`	--- - [ ] depends on: #8652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	30/8	Mathlib/Algebra/FreeAlgebra.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	904-21574 904 days ago	2-25170 2 days
8658	eric-wieser author:eric-wieser	feat: support right actions for `Con`	This adds a new `Con.CompatibleSMul` typeclass that captures exactly the condition when `smul` descends to the quotient. I was not quite able to merge this with `MulAction.QuotientAction`: * The imports are such that the congruence relation `QuotientGroup.con` is not yet available in that file * `QuotientGroup.con` requires the subgroup to be normal, while `MulAction.QuotientAction` does not --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	80/18	Mathlib/GroupTheory/Congruence.lean,Mathlib/RingTheory/Congruence.lean	2	6	['YaelDillies', 'eric-wieser']	nobody	656-74032 1 year ago	873-39679 873 days ago	29-65537 29 days
8788	FMLJohn author:FMLJohn	feat(Algebra/Module/GradeZeroModule): if `A` is a graded semiring and `M` is a graded `A`-module, then each grade of `M` is a module over the 0-th grade of `A`.	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	237/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	6	4	['FMLJohn', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	896-63928 896 days ago	1-57831 1 day
8906	jjaassoonn author:jjaassoonn	feat: add some missing lemmas about linear algebra	--- - [ ] depends on: #8905 [lifting injective modules to higher universe] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	45/1	Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/LinearAlgebra/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean	4	21	['AntoineChambert-Loir', 'alreadydone', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	892-47126 892 days ago	0-343 5 minutes
8961	eric-wieser author:eric-wieser	refactor: use the coinduced topology on ULift	--- - [x] depends on: #8958 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict awaiting-author awaiting-CI	46/14	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Constructions.lean	3	6	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	656-74032 1 year ago	890-19462 890 days ago	0-1 1 second
9146	laughinggas author:laughinggas	feat(Data/ZMod/Defs): Topological structure on `ZMod`	Added a discrete topology structure to `ZMod n` for all `n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-topology label:t-algebra$	55/3	Mathlib.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Instances/ZMod.lean,Mathlib/Topology/Maps.lean	5	61	['YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'laughinggas', 'mo271', 'urkud']	nobody	656-74032 1 year ago	863-32123 863 days ago	7-11053 7 days
9229	eric-wieser author:eric-wieser	refactor(Algebra/GradedMonoid): Use `HMul` to define `GMul`	This make the notation much nicer, but I'm pretty sure this is a bad idea for performance / ambiguity reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	114/125	Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/GradedMulAction.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean	11	6	['eric-wieser', 'leanprover-bot']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9354	chenyili0818 author:chenyili0818	feat: monotonicity of gradient on convex real-valued functions	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	540/0	Mathlib.lean,Mathlib/Analysis/Convex/ConvexFunction.lean	2	15	['github-actions', 'winstonyin']	nobody	656-74032 1 year ago	847-18258 847 days ago	23-36394 23 days
9356	alexjbest author:alexjbest	feat: assumption?	A little helper for replacing `assumption`s with `exact` statements quickly --- If this is approved I will add tests This begs the question of whether it might simply be better to add some sort of code action for "replace with trythis output" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	24/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/TryAssumption.lean	4	5	['alexjbest', 'j-loreaux', 'jcommelin']	nobody	656-74032 1 year ago	851-23630 851 days ago	19-26336 19 days
9469	dupuisf author:dupuisf	feat: maximum modulus principle for functions vanishing at infinity	This PR adds versions of the maximum modulus principle for functions vanishing at infinity that parallel those we already had for functions over a bounded set. These will have applications in e.g. norm interpolation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-analysis	71/0	Mathlib/Analysis/Complex/AbsMax.lean	1	8	['dupuisf', 'j-loreaux']	nobody	656-74032 1 year ago	851-28878 851 days ago	12-86009 12 days
9487	eric-wieser author:eric-wieser	feat: the exponential of dual numbers over non-commutative rings	This is a work in progress, as I don't know my way around the measure theory library. --- - [x] depends on: #9489 - [x] depends on: #9486 - [x] depends on: #10427 - [ ] depends on: #10452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-measure-probability merge-conflict t-analysis label:t-algebra$	97/0	Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean	1	7	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9510	eric-wieser author:eric-wieser	feat(Analysis/Calculus/DualNumber): Extending differentiable functions to dual numbers	This shows that this operation preserves multiplication and composition --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-analysis awaiting-CI label:t-algebra$	119/0	Mathlib/Analysis/Calculus/DualNumber.lean	1	4	['github-actions']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9570	eric-wieser author:eric-wieser	feat(Algebra/Star): Non-commutative generalization of `StarModule`	[Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Star.20modules.20over.20non-commutative.20scalars/near/383664005). Until we address #7152, we have to have both `StarModule` and `StarModule'`. To prove this generalization is useful, this shows that with it as an assumption, `TrivSqZeroExt` is a `StarRing`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-CI label:t-algebra$	66/6	Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Prod.lean,Mathlib/Algebra/TrivSqZeroExt.lean	4	0	[]	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
9642	eric-wieser author:eric-wieser	refactor(Analysis/Normed/{Group/Field}/Basic): Let `extends` generate the repeated fields	New-style structure shenanigans mean that instance constructors randomly complain about a missing field that can be found with `__ : MetricSpace _ := infer_instance`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I will write a longer PR description for this once CI is happy	WIP merge-conflict awaiting-author help-wanted t-analysis	122/202	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Order/Basic.lean,Mathlib/Analysis/NormedSpace/ProdLp.lean,Mathlib/Analysis/NormedSpace/Star/Matrix.lean,Mathlib/Analysis/NormedSpace/Unitization.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	17	11	['eric-wieser', 'leanprover-bot', 'urkud']	nobody	656-74032 1 year ago	unknown	0-0 0 seconds
6580	adomani author:adomani	chore: `move_add`-driven replacements	This PR accompanies #6576 and uses `move_add/mul` to simplify/streamline a selection of proofs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	12/13	Counterexamples/Monic_nonRegular.lean,Mathlib/Algebra/Associated.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean	4	0	[]	nobody	656-74031 1 year ago	942-36795 942 days ago	62-34247 62 days
6630	MohanadAhmed author:MohanadAhmed	feat: Reduced Spectral Theorem	For A hermitian matrix $A : n \times n$ with rank $A.rank \leq n$, we can eliminate the zero eigenvalues and their corresponding eigenvectors from the (alternate) spectral theorem. As such the matrix $A$ can be written as: $$A = V₁ D V₁ᴴ$$ where - $V₁$ : $n \times r$ is the matrix of eigenvector with non-zero associated eigenvalues. - $D$ is $r \times r$ is the diagonal matrix containing only non-zero eigenvalues on its main diagonal. with $r = A.rank$ being the rank of the matrix Towards that goal we make several equivalence definitions: - `{i // hA.eigenvalues i ≠ 0} ≃ Fin (A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (r - 1). - `{i // ¬ hA.eigenvalues i ≠ 0} ≃ Fin (n - A.rank)` the set of non-zero eigenvalues can be indexed by the numbers from 0 to (n - r - 1). - `{i // hA.eigenvalues i ≠ 0} ⊕ {i // ¬hA.eigenvalues i ≠ 0} ≃ n`: the index set of the matrix (together with the associated eigenvector matrix and eigenvalues matrix ) can be partitioned into two complement groups the ones corresponding to non-zero eigenvalues and the ones corresponding to zero eigenvalues. - We can then put the previous definitions together to obtain a: `Fin (A.rank) ⊕ Fin (Fintype.card n - A.rank) ≃ n` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	31/0	Mathlib/LinearAlgebra/Matrix/Spectrum.lean	1	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6777	adomani author:adomani	chore(CovariantClass): replace eta-expanded (· ·), (· + ·), (· ≤ ·), (· < ·)	Replace `CovariantClass X X (· * ·) (· ≤ ·)` with -> `CovariantClass X X HMul.hMul LE.le` and similarly for `HAdd`, `LT`, `Contravariant`. This PR is inspired by [Issue #6646](https://github.com/leanprover-community/mathlib4/issues/6646) and, more specifically, [this comment](https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1692792066). Note that https://github.com/leanprover/lean4/pull/2267 would make this unnecessary --- ```bash # First sed command: # the first captured pattern is `CovariantClass ` # the second captured pattern is `` # the third captured pattern is `+` or `` # the fourth captured pattern is `<` or `≤` # a match for `CovariantClass (· ·) (· ·)` becomes # `CovariantClass replaceop replaceop` # Second sed command: similar to the first, but looks for `(Function.swap (· ·))` sed -i ' s=$Co[ntra]variantClass \(..$ \2 \)(· $[+]$ ·) (· $[<≤]$ ·)=\1replaceop\3 replaceop\4=g s=$Co[ntra]variantClass \(..$ \2 \)($[Functio\.swap ]$(· $[+]$ ·)) (· $[<≤]$ ·)=\1(\3replaceop\4) replaceop\5=g s=replaceop+=HAdd.hAdd=g s=replaceop\=HMul.hMul=g s=replaceop<=LT.lt=g s=replaceop≤=LE.le=g s=$Co[ntra]variantClass N N$ (· \ ·) r=\1 HMul.hMul r=g s=$Co[ntra]variantClass N N (swap μ)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass N N$ (swap (· \* ·)) r=\1 (swap HMul.hMul) r=g s=$CovariantClass (Filter α) (Filter α)$ (· / ·) (· ≤ ·)=\1 HDiv.hDiv LE.le=g s=$CovariantClass (Filter α) (Filter α)$ (swap (· / ·)) (· ≤ ·)=\1 (swap HDiv.hDiv) LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· ≤ ·)=\1 LE.le=g s=$Co[ntra]variantClass . (fun x y .> . \* .)$ (· < ·)=\1 LT.lt=g s=$Co[ntra]variantClass [^}]$ (· ≤ ·)=\1 LE.le=g s=$CovariantClass .* (Filter β)$ (· • ·) LE.le=\1 HSMul.hSMul LE.le=g ' $(git ls-files '*.lean') ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	703/678	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/GroupPower/Order.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Archimedean.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/Group/OrderIso.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/LatticeGroup.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Cancel/Defs.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Lemmas.lean,Mathlib/Algebra/Order/Monoid/MinMax.lean,Mathlib/Algebra/Order/Monoid/NatCast.lean,Mathlib/Algebra/Order/Monoid/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Prod.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithZero/Basic.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Order/Sub/Canonical.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Algebra/Parity.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/List/BigOperators/Basic.lean,Mathlib/Data/List/BigOperators/Lemmas.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Nat/Cast/Order.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Real/ENNReal.lean,Mathlib/Data/Real/NNReal.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sign.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/VectorMeasure.lean,Mathlib/Order/ConditionallyCompleteLattice/Group.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Martingale/Basic.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Topology/ContinuousFunction/Algebra.lean,lean-toolchain,test/Recall.lean,test/propose.lean	81	37	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel', 'vihdzp']	nobody	656-74031 1 year ago	931-39528 931 days ago	35-63136 35 days
6791	eric-wieser author:eric-wieser	refactor: Use flat structures for morphisms	This restores the symmetry we had in Lean3, where we had `MonoidHom.mk f one mul` not `MonoidHom.mk (OneHom.mk f one) mul`, and `f.toFun` wasn't notation for `f.toMulHom.toFun`. The nesting provided by the previous inheritance is useless to us in the face of `MonoidHomClass.toMonoidHom`, which completely eta-expands the structure anyway. We call the class `FunLikeFlatHack._` because this means the field is called `to_` which uses up less space in the goal view than any alternative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted awaiting-CI	174/201	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/ZModuleEquivalence.lean,Mathlib/Algebra/Category/GroupWithZeroCat.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/UniqueProds.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group/Defs.lean,Mathlib/Algebra/Hom/GroupAction.lean,Mathlib/Algebra/Hom/NonUnitalAlg.lean,Mathlib/Algebra/Hom/Ring/Defs.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Analysis/Normed/Group/SemiNormedGroupCat.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Real/EReal.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/RingTheory/RingInvo.lean,Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/MetricSpace/Dilation.lean	32	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6930	kmill author:kmill	feat: `resynth_instances` tactic for resynthesizing instances in the goal or local context	This tactic can be useful for debugging non-canonical instances or for fixing up goals and hypotheses after using the `classical` tactic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	327/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ResynthInstances.lean,test/ResynthInstances.lean	4	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
6931	urkud author:urkud	refactor(Analysis/Normed): use `RingHomIsometric` for `.norm_cast`	--- I don't understand why linter fails. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-analysis	78/68	Mathlib/Analysis/LocallyConvex/ContinuousOfBounded.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Spectrum.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	0	[]	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7227	kmill author:kmill	feat: flexible binders and integration into notation3	Introduces `flexibleBinders`, which is an extensible system for binder notations that allow destructuring, bounded domains, and other niceties. Integrates this into `notation3`, and makes `Finset.sum`/`Finset.prod` use it. --- - [ ] depends on: #6833 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	1215/131	Mathlib.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Mathport/Notation.lean,Mathlib/Util/FlexibleBinders.lean,Mathlib/Util/FlexibleBindersFinset.lean,Mathlib/Util/SyntaxFun.lean,test/FlexibleBinders.lean,test/notation3.lean	10	3	['eric-wieser', 'kmill', 'leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7351	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend function on `Ioo` to `Icc`	Extend a strictly monotone function defined on an open interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-order	59/0	Mathlib.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	3	7	['j-loreaux', 'shuxuezhuyi']	nobody	656-74031 1 year ago	935-42859 935 days ago	30-32706 30 days
7467	ADedecker author:ADedecker	feat: spectrum of X →ᵇ ℂ is StoneCech X	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	121/23	Mathlib/Analysis/NormedSpace/Star/BoundedContinuousFunction.lean,Mathlib/Analysis/NormedSpace/Star/GelfandDuality.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/ContinuousFunction/Compact.lean	4	1	['github-actions']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7564	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend strictly monotone function on `Ioo` to homeomorphism on `Icc`	A strictly monotone function between open intervals can be extended to a homeomorphism between the closed intervals. --- - [ ] depends on: #7351 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	162/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	954-61263 954 days ago	0-537 8 minutes
7601	digama0 author:digama0	feat: ring hom support in `ring`	As [requested on Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/aroots/near/395750055). Adds support for distributing ring morphisms in `ring`: ```lean example (p : ℤ[X]) (r : ℤ) : C (2 * r) * p = C r * p + C r * p := by ring ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-meta label:t-algebra$	257/48	Mathlib/Tactic/Ring/Basic.lean,test/linear_combination.lean,test/ring.lean	3	1	['eric-wieser']	nobody	656-74031 1 year ago	889-57634 889 days ago	62-28836 62 days
7615	eric-wieser author:eric-wieser	chore(LinearAlgebra/Basic): generalize compatibleMaps to semilinear maps	Spotted while reviewing #7611 --- - [x] depends on: #7611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra easy awaiting-CI label:t-algebra$	9/33	Mathlib/LinearAlgebra/Basic.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	951-22339 951 days ago	0-1 1 second
7713	RemyDegenne author:RemyDegenne	feat: add_left/right_inj for measures	`μ + ν₁ = μ + ν₂ ↔ ν₁ = ν₂`, and similarly on the right. This is not true in general for measures, but is true when `μ` is mutually singular with the two other measures or when `μ` is finite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	53/1	Mathlib/MeasureTheory/Measure/MutuallySingular.lean,lean-toolchain	2	6	['RemyDegenne', 'digama0', 'eric-wieser', 'fpvandoorn']	nobody	656-74031 1 year ago	944-68169 944 days ago	0-62955 17 hours
7835	shuxuezhuyi author:shuxuezhuyi	feat(LinearAlgebra/Matrix): `lift` for projective special linear group	We provide converters to help with the use of "quotient.liftOn" on projective special linear groups. --- - [x] depends on: #7826 - [x] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	52/0	Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	1	3	['jcommelin', 'leanprover-community-mathlib4-bot', 'shuxuezhuyi']	jcommelin assignee:jcommelin	656-74031 1 year ago	802-83862 802 days ago	1-85797 1 day
7875	astrainfinita author:astrainfinita	chore: make `SMulCommClass A A B` and `SMulCommClass A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	54/48	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/NormedSpace/lpSpace.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/Ring.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Submonoid/Center.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/Topology/ContinuousFunction/ContinuousMapZero.lean,Mathlib/Topology/ContinuousFunction/StoneWeierstrass.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	27	15	['Parcly-Taxel', 'astrainfinita', 'jcommelin', 'leanprover-bot']	nobody	656-74031 1 year ago	711-4139 711 days ago	1-47913 1 day
7932	eric-wieser author:eric-wieser	refactor(Algebra/TrivSqZeroExt): replace with a structure	This is dogfooding my claim that "one-field structures are the lesser evil in Lean 4". This runs into the `simp [(stupid_parens)]` bug; or rather, a particular nasty instance of it where the offending simp call is inside `@[simps]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	155/73	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Logic/Equiv/TransferInstance.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean	4	1	['github-actions']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
7962	eric-wieser author:eric-wieser	feat: `DualNumber (Quaternion R)` as a `CliffordAlgebra`	This provides a clifford algebra isomorphic to the dual quaternions --- - [x] depends on: #7934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	307/7	Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Equivs.lean	3	16	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	656-74031 1 year ago	unknown	0-0 0 seconds
8364	thorimur author:thorimur	feat: `refine?`	This PR adds `refine? e`, which suggests replacing unsynthesized `_`'s in `e` with `?_` in order to make `refine e'` work: ```lean example : Nat → Nat := by refine? fun (_ : _) => _ -- Try this: refine fun (_ : _) => ?_ ``` Note that this only suggests replacements for `_`'s present in the syntax; to create goals for implicit or instance arguments, the user is expected to use `refine'`. --- I'm especially open to suggestions on the filename (currently `RefineFix`). I'm also curious if this behaves as expected! Feel free to try it out "in real life" and comment here on edge cases. - [ ] depends on: #8503 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	684/5	Mathlib.lean,Mathlib/Lean/CoreM.lean,Mathlib/Lean/Elab/Tactic/ElabTerm.lean,Mathlib/Lean/Elab/Term.lean,Mathlib/Tactic.lean,Mathlib/Tactic/RefineFix.lean,Mathlib/Util/Delaborators.lean,Mathlib/Util/Syntax.lean,test/RefineFix.lean	9	5	['j-loreaux', 'leanprover-community-mathlib4-bot', 'thorimur']	nobody	656-74031 1 year ago	912-7765 912 days ago	6-59892 6 days
4871	j-loreaux author:j-loreaux	feat: define the additive submonoid of positive elements in a star ordered ring	This file defines the `AddSubmonoid` of nonegative elements `StarOrderedRing.positive R` in a star ordered ring `R` with carrier `{ x : R \| 0 ≤ x }` (in fact, the definition only requires `OrderedAddCommMonoid R` to allow for other use cases, but it is primarily intended for `StarOrderedRing R`). Equivalently, this is the `AddSubmonoid` generated by the elements of the form `star s * s`. Even though this technically corresponds to the nonnegative elements, the "positive" terminology is standard throughout the literature (at least in C⋆-algebra theory and operator theory), so we choose to prefer that. The advantage of using this over other definitions of positivity is that it allows us to unify several different concepts under a single umbrella. For example, one might be tempted to consider the collection of bounded linear operators on an Hilbert space and define positivity as `∀ x, 0 ≤ ⟪T x, x⟫`, but this doesn't generalize nicely to C⋆-algebras. Alternatively, one could define positivity as those self-adjoint elements with nonnegative spectrum, but this requires the algebra to be unital. Our definition herein conveniently sidesteps these issues. --- Note: I declared the `AddMonoidWithOne` and `AddGroupWithOne` instances for `selfAdjoint R` separately because it made the proof of the latter easier. - [x] depends on: #6229 - [x] depends on: #10209 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	216/12	Mathlib.lean,Mathlib/Algebra/Order/Ring/CharZero.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Positive.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	6	28	['eric-wieser', 'j-loreaux', 'leanprover-community-mathlib4-bot']	nobody	656-74030 1 year ago	1069-60082 1069 days ago	5-55287 5 days
5133	kmill author:kmill	feat: IntermediateField adjoin syntax for sets of elements	Adds support for both `F⟮S⟯` and `F⟮α⟯`. The term `x` in `F⟮x⟯` is elaborated, and if it has type `Set _` the first interpretation is used, and otherwise the second is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	656-74030 1 year ago	1067-75156 1067 days ago	0-20 20 seconds
5912	ADedecker author:ADedecker	feat(Analysis.Distribution.ContDiffMapSupportedIn): space of smooth maps with support in a fixed compact	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	513/13	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean	8	0	[]	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6002	slerpyyy author:slerpyyy	feat(Analysis.SpecialFunctions.Gaussian): add `integrable_fun_mul_exp_neg_mul_sq`	If `f : ℝ → ℝ` is bounded by a polynomial, `fun x : ℝ => f x * exp (-b * x ^ 2)` is integrable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	26/0	Mathlib/Analysis/SpecialFunctions/Gaussian.lean	1	3	['ocfnash', 'slerpyyy', 'urkud']	nobody	656-74030 1 year ago	1024-74392 1024 days ago	9-71263 9 days
6195	eric-wieser author:eric-wieser	chore(RingTheory/TensorProduct): golf the `mul` definition	--- - [x] depends on: #6211 - [x] depends on: #6187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Strangely this causes a timeout downstream	merge-conflict t-algebra awaiting-CI label:t-algebra$	4/29	Mathlib/RingTheory/TensorProduct.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6328	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` lower priority	Many similar instances have been marked as lower priority. I'd like to see if this would make things faster. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-CI label:t-algebra$	14/14	Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	3	1	['digama0']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6330	astrainfinita author:astrainfinita	chore: make some instance about `Sub...Class` higher priority than `Sub...`	The opposite direction to #6328. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra slow-typeclass-synthesis label:t-algebra$	123/128	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/Subfield.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Subring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	11	13	['astrainfinita', 'digama0', 'leanprover-bot']	nobody	656-74030 1 year ago	unknown	0-0 0 seconds
6403	astrainfinita author:astrainfinita	chore: change instance priorities of `Ordered*` hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-order merge-conflict slow-typeclass-synthesis awaiting-author label:t-algebra$	253/79	Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/WithZero/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/WithZero.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/RingTheory/HahnSeries.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	18	39	['Vierkantor', 'astrainfinita', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	656-74030 1 year ago	901-26772 901 days ago	13-18399 13 days
6491	eric-wieser author:eric-wieser	chore(Mathlib/Algebra/Hom/GroupAction): add `SMulHomClass.comp_smul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	656-74030 1 year ago	928-60030 928 days ago	83-76369 83 days
7076	grunweg author:grunweg	feat: define measure zero subsets of a manifold	A topological manifold has no canonical measure, but there is a canonical notion of measure zero subsets. We show that these are closed under subsets and countable unions (hence define a filter, the almost everywhere filter) and that a closed nowhere dense has empty interior. This is necessary for stating the general version of Sard's theorem (in finite dimensions), and a first step towards its proof. This code was written at LftCM 2023. Thanks for @fpvandoorn for mentoring me! :heart: --- Unresolved questions/looking for feedback - Is "measure zero" a good name or would "null set" be better? I tend towards the former, but welcome input from a measure theorist (which I'm not). - What is the correct definition? One could also define "measure zero" using any `IsOpenPosMeasure` on the charted space. I think all results in this file still hold then, but for applications (e.g., Sard's theorem), this might be too general. - define custom notation, similar to the a.e. filter on a measure space? (We could include $J$ instead of $\mu$.) - what's the right syntax for formulas in docstrings --- use LaTeX or backticks? I don't know how to preview the generated docs, the guidelines are a bit ambiguous for me.	merge-conflict WIP t-differential-geometry t-measure-probability	165/0	Mathlib.lean,Mathlib/Geometry/Manifold/MeasureZero.lean,docs/references.bib	3	27	['ADedecker', 'github-actions', 'grunweg', 'mo271', 'sgouezel']	ADedecker assignee:ADedecker	656-74030 1 year ago	811-71339 811 days ago	43-56110 43 days
3757	thorimur author:thorimur	feat: config options for `fail_if_no_progress`	This PR creates config options for `fail_if_no_progress` that allow the user to tweak what exactly counts as "progress". This includes whether to use defeq or `BEq`, what transparency to use, and which parts of the goal and local context to check. It also splits off the comparison functionality into `Mathlib.Lean.Meta.Compare`, which provides fully configurable comparison functions for common complex metaprogramming types not specific to `fail_if_no_progress`. These types are `Expr`, `LocalDecl`, `LocalContext`, `MetavarDecl`, `MVarId`, and `List MVarId`. --- See [zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/progress.20on.20fail_if_no_progress) for a couple review questions. Status update: this PR is now basically done, save for some extra tests which should probably be included. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	603/54	Mathlib.lean,Mathlib/Lean/Meta.lean,Mathlib/Lean/Meta/Compare.lean,Mathlib/Tactic/FailIfNoProgress.lean,test/fail_if_no_progress.lean	5	38	['alexjbest', 'github-actions', 'joneugster', 'kim-em', 'thorimur']	nobody	656-74029 1 year ago	1113-38711 1113 days ago	0-15 15 seconds
12353	thorimur author:thorimur	feat: `conv%`	This PR introduces `conv% e => tac`, along with `simp%`, `norm_num%`, and `push_neg%`, which are defined in terms of `conv%`. It also introduces `conv%?` (and `simp%?`, `norm_num%?`, and `push_neg%?`) as shortcuts for `show_term ...`. This is a relatively straightforward refactor of code already present in the implementation of `#conv`, and otherwise relies entirely on simple macros. This PR also introduces some modifications to existing command syntax for `#conv`, `#simp`, and `#norm_num`: * The syntax for `#conv` was `#conv tac => e`; however, this is inconsistent with the tactic syntax, and so this has been flipped to `#conv e => tac`. Likewise, `conv%` uses the same (new) syntax `conv% e => tac`. * `#simp` and `#norm_num` separated their config and `only` syntax from the expression by an optional `=>` (for `#simp`) and an optional `:` (for `#norm_num`) (e.g. `#simp only [lem] => e`). These have both been replaced with an optional`on` (e.g. `#simp only [lem] on e`) which is also used for `simp%` and `norm_num%`. Although `#whnf` is implemented in terms of `#conv`, this PR doesn't introduce `whnf%` in the same way, as that's probably better off being implemented directly instead of through `conv`. --- WIP: needs tests. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	131/32	Mathlib/Tactic/Conv.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/PushNeg.lean,docs/Conv/Guide.lean	4	0	[]	nobody	652-50339 1 year ago	756-1981 756 days ago	0-17 17 seconds
7903	urkud author:urkud	feat: define `UnboundedSpace`	--- The new instances generate some timeouts, and I don't understand why. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-topology	111/59	Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Topology/Bornology/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean	6	1	['github-actions']	nobody	649-62008 1 year ago	unknown	0-0 0 seconds
15679	adomani author:adomani	test: refactor in CI	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	213/5	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/CategoryTheory/Bicategory/Adjunction.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/GroupTheory/Coxeter/Matrix.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/TestRefactor.lean,Refactor/Main.lean,lakefile.lean,lean-toolchain	21	1	['github-actions']	nobody	644-31184 1 year ago	646-40626 646 days ago	0-8 8 seconds
7565	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend homeomorphism of `Ioo` to `Icc`	We extend the homeomorphisms between open intervals to homeomorphisms between the closed intervals. --- - [ ] depends on: #7018 - [ ] depends on: #7351 - [ ] depends on: #7564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR t-order	389/5	Mathlib.lean,Mathlib/Data/Set/Intervals/Image.lean,Mathlib/Order/Directed.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean,Mathlib/Topology/Algebra/Order/IntermediateValue.lean	5	1	['leanprover-community-mathlib4-bot']	nobody	642-67684 1 year ago	954-48563 954 days ago	0-222 3 minutes
10629	madvorak author:madvorak	feat: List.cons_sublist_append_iff_right	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	642-67575 1 year ago	768-76412 768 days ago	53-73442 53 days
9973	Ruben-VandeVelde author:Ruben-VandeVelde	feat: polynomials formed by lists	From https://github.com/leanprover-community/mathlib/pull/15476 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-data	311/0	Mathlib.lean,Mathlib/Data/Polynomial/OfList.lean	2	0	[]	nobody	642-67108 1 year ago	unknown	0-0 0 seconds
12926	joelriou author:joelriou	feat(CategoryTheory): the monoidal category structure induced by a monoidal functor	In this PR, given a monoidal functor `F : MonoidalFunctor C D`, we define a monoidal category structure on the category `InducedCategory D F.obj`, which has the "same" objects as `C`, but the morphisms between `X` and `Y` identify to `F.obj X ⟶ F.obj Y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	105/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Induced.lean	2	3	['eric-wieser', 'github-actions', 'joelriou']	nobody	642-65507 1 year ago	733-70712 733 days ago	0-10 10 seconds
12869	adomani author:adomani	feat: linter and script for `theorem` vs `lemma`	This PR contains a linter for flagging doc-string-less `theorem`s, as well as a bash script that, once the linter ran on Mathlib, automatically replaces every linter-offending `theorem` by `lemma`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	106/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ThmLemma.lean,scripts/thmLemma.sh	4	13	['adomani', 'github-actions', 'grunweg', 'joneugster']	nobody	642-52271 1 year ago	696-72766 696 days ago	38-16364 38 days
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	641-66423 1 year ago	672-27005 672 days ago	6-38745 6 days
12093	ADedecker author:ADedecker	feat: tweak the definition of semicontinuity to behave better in nonlinear orders	Summary of the changes: - change definitions to make [lowerSemicontinuous_iff_isClosed_preimage](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Semicontinuous.html#lowerSemicontinuous_iff_isClosed_preimage) true without assuming `LinearOrder`, so that semicontinuity corresponds to continuity for lower/upper order topology on the codomain. See discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Semicontinuity.20definition.20for.20non-linear.20orders/near/432898278) - add new `iff` lemmas for unfolding the definition - add `iff` lemmas with the old definition in the linearly ordered case - some basic lemmas need to be changed in an easy way - minimize assumptions for continuity => semicontinuity - prove the semicontinuity criterion for indicators using "preimage of Ici/Iic" instead of a direct proof, because the proof is more natural (especially because we have no `filter_upwards` for `Frequently`) - in the rest of the file (which is about linear orders anyway), we don't touch the statements and just rewrite to the old definition. Some of these could be generalized, but we keep that for a later PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology	274/130	Mathlib/Analysis/BoundedVariation.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Semicontinuous.lean	4	0	[]	nobody	641-63899 1 year ago	unknown	0-0 0 seconds
11393	mcdoll author:mcdoll	feat(Analysis/Distribution/SchwartzSpace): The Heine-Borel property	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	688/3	Mathlib.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/UniformSpace/Ascoli.lean,Mathlib/Topology/UniformSpace/Pi.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	6	0	[]	nobody	641-63865 1 year ago	unknown	0-0 0 seconds
9444	erdOne author:erdOne	feat: Various instances regarding `𝓞 K`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted t-number-theory	27/0	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/IntegralClosure.lean	2	9	['erdOne', 'leanprover-bot', 'mattrobball', 'riccardobrasca', 'xroblot']	nobody	641-63784 1 year ago	863-63211 863 days ago	1-62292 1 day
8931	hmonroe author:hmonroe	feat(Computable): define P, NP, and NP-complete	Revised to focus on languages that are binary strings, given the issue of non-acceptable encodings of unspecified Types --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author	381/5	Mathlib.lean,Mathlib/Computability/Complexity copy.lean,Mathlib/Computability/Complexity.lean,Mathlib/Computability/Encoding.lean,Mathlib/Computability/TMComputable.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Computability/halting example.lean,docs/references.bib	8	3	['fpvandoorn', 'github-actions', 'hmonroe']	nobody	641-63749 1 year ago	797-73131 797 days ago	93-64275 93 days
10387	adomani author:adomani	feat(Tactic/ComputeDegree): add `polynomial` tactic	Introducing the `polynomial` tactic, summing up `compute_degree, monicity` and adding support for `leadingCoeff`. This is more of a proof of concept: if there is interest in this tactic, I can polish it up. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Compute.20roots.20of.20polynomials/near/420713624). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP RFC t-meta	24/0	Mathlib/Tactic/ComputeDegree.lean	1	0	[]	nobody	641-63571 1 year ago	685-46601 685 days ago	143-73801 143 days
9154	FR-vdash-bot author:FR-vdash-bot	feat: `npow` / `nsmul` / `Nat.cast`/ `zpow` / `zsmul` implemented using `Nat.binaryRec`	--- - [ ] depends on: https://github.com/leanprover/lean4/pull/3756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra blocked-by-other-PR label:t-algebra$	168/359	Mathlib/Algebra/Group/Defs.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/EvenOddRec.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Order/Basic.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Init/Data/Nat/Bitwise.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Nat.lean,lake-manifest.json,lakefile.lean,test/zmod.lean	25	7	['astrainfinita', 'eric-wieser', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	641-63362 1 year ago	unknown	0-0 0 seconds
6603	tydeu author:tydeu	feat: automatically try `cache get` before build	--- A quick proof-of-concept. With this, `lake build` will always try `cache get` before building mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP CI	29/0	lakefile.lean	1	3	['kim-em', 'tydeu']	nobody	641-63336 1 year ago	995-79859 995 days ago	11-2031 11 days
6058	apurvnakade author:apurvnakade	feat: duality theory for cone programs	This PR tracks the development of duality theory for cone programs. [Reference](https://ti.inf.ethz.ch/ew/courses/ApproxSDP09/notes/conelp.pdf) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #6059 - [ ] define direct sum of cones - [ ] weak duality - [ ] regular duality - [ ] slater condition - [ ] strong duality	merge-conflict WIP t-analysis	159/0	Mathlib.lean,Mathlib/Analysis/Convex/Cone/ConeLinearProgram.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	641-63281 1 year ago	1031-13789 1031 days ago	0-9 9 seconds
6449	ADedecker author:ADedecker	feat: functions with finite fibers	--- This has been discussed before on [Zulip](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/.E2.9C.94.20Cofinite.20maps.3F) and it came up again while working with @kkytola's student. As explained in the docstring, we could absolutely just use `Tendsto f cofinite cofinite` all the time, but (1) we lack some API for it (2) the API is nicer to setup if we have a separate def (e.g for dot notation) and (3) mentioning filters for such a simple concept is really not beginner-friendly. I'm not sure at all about the name. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	203/0	Mathlib.lean,Mathlib/Logic/Function/HasFiniteFibers.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Cofinite.lean	4	14	['ADedecker', 'YaelDillies', 'alexjbest', 'kkytola']	nobody	641-63275 1 year ago	1007-61329 1007 days ago	6-70040 6 days
13163	erdOne author:erdOne	feat(.vscode/module-docstring.code-snippet): Prevent auto-complete from firing on `do`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	5/0	.vscode/module-docstring.code-snippets	1	5	['erdOne', 'grunweg', 'robertylewis', 'trivial1711']	nobody	641-61885 1 year ago	673-76077 673 days ago	50-78405 50 days
13791	digama0 author:digama0	refactor: Primrec and Partrec	General cleanup of the `Primrec` and `Partrec` files, to better adjust to lean 4 things. The main user-visible change is that `Primrec₂` is no longer a `def` but an `abbrev`, because it was causing inference issues in lean 4. I also removed all the nonterminal `simp`s in `PartrecCode.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability tech debt	585/778	Mathlib/Computability/Ackermann.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean	5	2	['github-actions', 'grunweg']	nobody	638-30420 1 year ago	702-20006 702 days ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [x] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry t-category-theory	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg']	nobody	638-30279 1 year ago	766-47220 766 days ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	638-30178 1 year ago	724-40162 724 days ago	29-50022 29 days
9978	FR-vdash-bot author:FR-vdash-bot	chore(FieldTheory/KummerExtension): move some lemmas earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	197/177	Mathlib.lean,Mathlib/Data/Polynomial/FieldDivision.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Polynomial/Irreducible.lean	5	5	['alreadydone', 'grunweg', 'riccardobrasca']	nobody	638-29970 1 year ago	836-24152 836 days ago	8-83342 8 days
12429	adomani author:adomani	feat: toND -- auto-generating natDegree	This is an experiment to automatically translate theorems about `degree` to theorems about `natDegree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC merge-conflict awaiting-author t-meta label:t-algebra$	167/132	Mathlib.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Mirror.lean,Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ToNatDegree.lean,scripts/noshake.json	11	2	['adomani', 'grunweg']	nobody	638-29281 1 year ago	749-63354 749 days ago	3-76602 3 days
12751	Command-Master author:Command-Master	feat: add lemmas for Nat/Bits, Nat/Bitwise and Nat/Size	Remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	66/7	Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/Size.lean	4	26	['Command-Master', 'Rida-Hamadani', 'Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'jcommelin']	nobody	637-51332 1 year ago	672-57554 672 days ago	56-40668 56 days
15448	urkud author:urkud	chore(*): deprecate `Option.elim'`	Use `Option.elim` instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt	54/50	Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Data/Option/Defs.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Embedding/Set.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Topology/Compactness/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean	17	12	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'grunweg', 'urkud']	nobody	637-40385 1 year ago	647-147 647 days ago	7-18420 7 days
10350	Shamrock-Frost author:Shamrock-Frost	feat(Data/Setoid): add the operations of taking the equivalence class of an element and of saturating a set wrt an equivalence relation	I'm open to suggestions about changing the name "saturate", someone on zulip rightly pointed out this is a very overloaded term in math. That said, I think it's unlikely to cause confusion and that there's only one reasonable interpretation in the context of setoids. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	169/3	Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Order/Closure.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	635-53606 1 year ago	754-45234 754 days ago	19-74546 19 days
13573	Shamrock-Frost author:Shamrock-Frost	feat: add multivariate polynomial modules	Add a type synonym for multivariate polynomials with coefficients in a module. --- Multivariate polynomials with module coefficients are sort of silly, but they sometimes show up in commutative algebra (eg in the definition of a quasi regular sequence). Writing this code involved a lot of copy and pasting from `PolynomialModule` and `MvPolynomial`. The API is definitely lacking at this stage but it's a start. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	691/6	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Module/Basic.lean,Mathlib/Algebra/MvPolynomial/Module/MvAEval.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean	4	9	['Shamrock-Frost', 'erdOne', 'github-actions']	nobody	635-53586 1 year ago	671-45954 671 days ago	39-72752 39 days
6517	MohanadAhmed author:MohanadAhmed	feat: discrete Fourier transform of a finite sequence	# Discrete Fourier Transform (DFT) Matrix and DFT of a (finite) sequence This file defines the `dft` opertaion on a sequence (also a vecotr) and the DFT operation matrix ## Main definitions - `dft v`: given a sequence (v : (Fin n) → ℂ) we can transform it into a sequence (V : (Fin n) →ℂ) such that $$V [p] = ∑_{k = 0}^{N - 1} e^{-j2πkp/n} v [k]$$ - `idft V` : given a sequence (V : (Fin n) → ℂ) we can transform it into a sequence (v : (Fin n) → ℂ) such that $$v [k] = \frac{1}{N}∑_{p = 0}^{n - 1} e^{j2πkp/N} v [p]$$ - `dftMatrix n` : the dft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = e^{-j2πkp/n}$$ - `(dftMatrix n)⁻¹` : the idft matrix of dimensions $n \times n$ with the `k, p` entry equal to $$Wₙ[k, p] = (1/N) e^{j2πkp/n}$$ ## Main results - `dft v = (dftMatrix n) v` : the dft operation on a sequence is the same as the dft matrix applied to the vector - `idft V = (dftMatrix n)⁻¹ V` : the idft operation on a sequence is the same as the idft matrix applied to the vector - `dft (idft v) = dft ( idft v) = v` the dft and idft operations are inverses - `Wₙ = vandermonde (w)` : the dft matrix is vandermonde with `w` being the first row of the dft matrix - `circulant t = (dftMatrix n)⁻¹ ⬝ diagonal (dft t) ⬝ (dftMatrix n)` : a circulant matrix is diagonalizable by the dft and idft matrix pair. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	294/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/DFT.lean	2	26	['MohanadAhmed', 'ericrbg']	nobody	635-53424 1 year ago	944-77640 944 days ago	65-20427 65 days
13155	alreadydone author:alreadydone	feat(NumberTheory/EllipticDivisibilitySequence): show elliptic relations follow from even-odd recursion	This PR is centered around the (generalized) elliptic relations (`rel₄`) $E(a,b,c,d): W_{a+b}W_{a-b}W_{c+d}W_{c-d}=W_{a+c}W_{a-c}W_{b+d}W_{b-d}-W_{a+d}W_{a-d}W_{b+c}W_{b-c}$. For an integer-indexed sequence W valued in a commutative ring, the relation makes sense only when a,b,c,d are all integers or all half integers. For convenience of formalization, we instead consider integers a,b,c,d of the same parity and divide all subscripts by 2. We extract the subexpression $W_{(a+b)/2}W_{(a-b)/2}$ (which appear six times) as `addMulSub W a b`. The collection of all $E(a,b,c,d)$ is equivalent to Stange's axiom for elliptic nets (`net`), and the literature (e.g. Silverman) commonly consider only the three-index special case $E(m,n,r,0)$ (`Rel₃`). Important special cases of these relations are (i) $E(m+1,m,1,0): W_{2m+1}W_1^3=W_{m+2}W_m^3-W_{m+1}^3 W_{m-1}$ (`oddRec`) and (ii) $E(m+1,m-1,1,0): W_{2m}W_2 W_1^2=W_m(W_{m+2}W_{m-1}^2-W_{m-2}W_{m+1}^2)$ (`evenRec`), which suffice to uniquely specify $W$ on all positive integers recursively from four initial values $W_1, W_2, W_3, W_4$ (`IsEllSequence.ext`, if $W_1 W_2$ is not a zero divisor). In the usual setting where $W_1=1$ and $W_2\mid W_4$, there does exist a sequence (`normEDS`) satisfying (i) and (ii) given initial values $W_2, W_3$ and $W_4/W_2$. It turns out the same non-zerodivisor condition also guarantees that W is an odd function with $W_0=0$, which naturally extends W to all integers. The main result of this PR (`rel₄_of_oddRec_evenRec`, `IsEllSequence.of_oddRec_evenRec`) is a purely algebraic proof that the sequence W defined by the single-parameter elliptic relations (i) and (ii) implies all $E(a,b,c,d)$, based on my original argument first published on [Math.SE](https://math.stackexchange.com/a/4903422/12932). It's based on the observation that a nonzerodivisor-multiple of $E(a,b,c,d)$ can be expressed as a linear combination of various $E(a,b,c_\min,d_\min)$ with the two smallest indices fixed at their minimal possible values, which can be transformed (`transf`) to an elliptic relation with smaller `a` (which can be assumed to hold by induction), unless they are of the form (i) or (ii) which hold by assumption. For this argument it's necessary to assume `a > b > c > d ≥ 0` (see `StrictAnti₄` and `Rel₄OfValid`), but it's easy to extend to arbitrary a,b,c,d by symmetry properties of `rel₄` under negation and permutations of indices. In the subsequent PR #13057, we show all normalized EDSs (`normEDS`), defined using the even-odd recursion (i)-(ii), are elliptic (i.e. satisfy the elliptic relations) divisibility sequences. This PR doesn't directly apply because a normEDS doesn't always satisfy the nonzerodivisor condition, but they are specializations of the universal normEDS, which does satisfy the condition. The technique of reducing to the universal case will be applied many times, and relies on the naturality (`map`) lemmas. We also change the `ℕ` in the definition `IsDivSequence` to `ℤ` which is more natural given that W is a `ℤ`-indexed sequence. --- - [x] depends on: #13153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	565/12	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	55	['Multramate', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	629-67028 1 year ago	678-68915 678 days ago	26-39367 26 days
15600	adomani author:adomani	feat: lint also `let` vs `have`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter	77/26	Mathlib/Tactic/Linter/HaveLetLinter.lean,test/HaveLetLinter.lean	2	1	['github-actions']	nobody	628-35304 1 year ago	649-29002 649 days ago	0-8 8 seconds
16253	Shreyas4991 author:Shreyas4991	feat: Basics of Discrete Fair Division in Mathlib	This PR adds the basics of discrete fair division in mathlib. We include the definitions of allocations, valuations, properties of valuations, and the following notions : Envy-Freeness (EF), Envy-Freeness upto 1 good (EF1), and envy freeness upto any good (EFX). We also include the various implications between these notions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-author	144/0	Mathlib/GameTheory/FairDivision/Discrete/Basic.lean	1	9	['Shreyas4991', 'eric-wieser', 'github-actions']	nobody	627-33217 1 year ago	627-37478 627 days ago	0-20853 5 hours
15121	Eloitor author:Eloitor	feat: iff theorems for IsSplitEpi and IsSplitMono in opposite category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-category-theory new-contributor	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	624-26167 1 year ago	655-71826 655 days ago	7-3203 7 days
15895	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): mapping between two types of nonterminal symbols	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability WIP	172/0	Mathlib/Computability/ContextFreeGrammar.lean	1	43	['YaelDillies', 'github-actions', 'madvorak']	nobody	623-42960 1 year ago	627-76469 627 days ago	1-43047 1 day
14038	adomani author:adomani	test/decl diff in lean dev	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	231/2	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,.github/workflows/mk_build_yml.sh,Mathlib/Tactic/Eval.lean,scripts/decls_diff_hybrid.sh,scripts/list_decls.lean	8	3	['github-actions']	nobody	622-51020 1 year ago	695-21139 695 days ago	0-8 8 seconds
7861	shuxuezhuyi author:shuxuezhuyi	feat(Geometry/Hyperbolic/UpperHalfPlane): instance IsometricSMul PSL(2, ℝ) ℍ	--- - [ ] depends on: #7835 - [ ] depends on: #7791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-euclidean-geometry	98/0	Mathlib.lean,Mathlib/Geometry/Hyperbolic/UpperHalfPlane/Basic.lean,Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	616-73361 1 year ago	677-27489 677 days ago	43-50453 43 days
16570	yuma-mizuno author:yuma-mizuno	chore(Tactic/CategoryTheory): change `TermElabM` to `MetaM`	Separated from #15335. To use `Qq`, we need to modify `Qq` to support universe matching. See [Zulip](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2315335.20meta.20code.20for.20monoidal.20categories). --- - [ ] depends on: #15335 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	26/15	Mathlib/Tactic/CategoryTheory/BicategoryCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	616-49826 1 year ago	unknown	0-0 0 seconds
10591	adri326 author:adri326	feat(Topology/Algebra/ConstMulAction): properties of continuous actions in Hausdorff spaces	Defines some useful properties of `ContinuousConstSMul` group actions on Hausdorff spaces: - `MulAction.isClosed_fixedBy`, which proves that the `fixedBy α m` set is closed - `t2_separation_smul`, which constructs an open set `s` such that `s` and `g • s` are disjoint - `Set.InjOn.t2_separation_smul`, the extension of `t2_separation_smul` to a set of group elements whose action is injective --- This PR belongs my series of PR around the formalization of Rubin's theorem. `MulAction.isClosed_fixedBy` is used in several places along the proof, and the separation lemmas are primarily used in showing that `(fixedBy α g)ᶜ` and `(fixedBy α h)ᶜ` are disjoint under some intricate but fully group-theoretic condition. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author t-algebra label:t-algebra$	57/0	Mathlib/Topology/Algebra/ConstMulAction.lean	1	9	['ADedecker', 'adri326', 'j-loreaux', 'jcommelin']	ADedecker assignee:ADedecker	615-41818 1 year ago	767-54560 767 days ago	55-82204 55 days
7545	shuxuezhuyi author:shuxuezhuyi	feat: APIs of `Function.extend f g e'` when `f` is injective	We characterizes `range g`, `Injective g`, `Surjective g` and `Bijective g` in terms of `extend f g e'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	50/0	Mathlib.lean,Mathlib/Logic/Function/ApiForExtend.lean	2	1	['fpvandoorn']	nobody	614-86193 1 year ago	923-33975 923 days ago	32-32325 32 days
14078	Ruben-VandeVelde author:Ruben-VandeVelde	feat(CI): continue after mk_all fails	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	43/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Data/Nat/Test.lean	5	2	['bryangingechen', 'github-actions']	nobody	611-9026 1 year ago	693-61986 693 days ago	0-13311 3 hours
11283	hmonroe author:hmonroe	feat(ModelTheory/Satisfiability): define theory with independent sentence	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-logic	8/0	Mathlib/ModelTheory/Satisfiability.lean	1	2	['fpvandoorn', 'hmonroe']	nobody	608-65980 1 year ago	795-39650 795 days ago	3-63452 3 days
16914	siddhartha-gadgil author:siddhartha-gadgil	Loogle syntax with non-reserved	This is PR mainly to test that loogle syntax does not break stuff downstream --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/4	lake-manifest.json,lakefile.lean	2	1	['github-actions']	nobody	606-54589 1 year ago	607-51678 607 days ago	0-14835 4 hours
13782	alreadydone author:alreadydone	feat(EllipticCurve): ZSMul formula in terms of division polynomials	The formula $[n]P = (\phi_n(x,y) : \omega_n(x,y) : \psi_n(x,y))$ in Jacobian coordinates for $P=(x,y)$ a nonsingular point on a Weierstrass/elliptic curve. --- - [x] depends on: #12883 - [x] depends on: #13399 - [ ] depends on: #13057 - [ ] depends on: #13155 - [x] depends on: #13845 - [x] depends on: #13846 - [ ] depends on: #13847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory blocked-by-other-PR merge-conflict t-algebraic-geometry label:t-algebra$	2462/232	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/ZSMul.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	10	8	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	604-17554 1 year ago	unknown	0-0 0 seconds
8118	iwilare author:iwilare	feat(CategoryTheory): add dinatural transformations	A starting point to define [dinatural transformations](https://ncatlab.org/nlab/show/dinatural+transformation). This is my first PR so style comments and improvements are very welcome! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	147/7	Mathlib.lean,Mathlib/CategoryTheory/DinatTrans.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Products/Bifunctor.lean	4	49	['Shamrock-Frost', 'github-actions', 'iwilare', 'joelriou']	Shamrock-Frost assignee:Shamrock-Frost	601-76875 1 year ago	705-57352 705 days ago	21-30729 21 days
14242	js2357 author:js2357	feat: Prove equivalence of `isDedekindDomain` and `isDedekindDomainDvr`	Prove that `isDedekindDomainDvr` is equivalent to both `isDedekindDomain` and `isDedekindDomainInv`. Specifically, prove `isDedekindDomainDvr A → isDedekindDomainInv A`, because `isDedekindDomain A → isDedekindDomainDvr A` and `IsDedekindDomain A ↔ IsDedekindDomainInv A` are already in Mathlib. - [x] depends on: #14099 - [x] depends on: #14216 - [ ] depends on: #14237 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	269/1	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	601-37226 1 year ago	689-26173 689 days ago	0-273 4 minutes
7516	ADedecker author:ADedecker	perf: use `abbrev` to prevent unifying useless data	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4/3	Mathlib/Topology/ContinuousFunction/Bounded.lean	1	3	['ADedecker', 'leanprover-bot', 'mattrobball']	nobody	596-7228 1 year ago	956-57845 956 days ago	0-16 16 seconds
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	137/2	Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Quandle.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/QPF/Multivariate/Constructions/Fix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Set/Finite.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/Quotients.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RepresentationTheory/Action/Concrete.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/State.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/SetTheory/Surreal/Multiplication.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/UniformSpace/Separation.lean,test/interactiveUnfold.lean	68	1	['github-actions']	nobody	596-2271 1 year ago	596-2271 596 days ago	4-72805 4 days
16887	metinersin author:metinersin	feat(ModelTheory/Complexity): define conjunctive and disjunctive formulas	Defines `FirstOrder.Language.BoundedFormula.IsConjunctive` and `FirstOrder.Language.BoundedFormula.IsDisjunctive`. --- - [ ] depends on: #16885 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61278 608 days ago	0-1299 21 minutes
16888	metinersin author:metinersin	feat(ModelTheory/Complexity): Define conjunctive and disjunctive normal forms	Define `FirstOrder.Language.BoundedFormula.IsDNF` and `FirstOrder.Language.BoundedFormula.IsCNF`. --- - [ ] depends on: #16887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33204 1 year ago	608-61279 608 days ago	0-1045 17 minutes
16889	metinersin author:metinersin	feat(ModelTheory/Complexity): Normal forms	Defines `FirstOrder.Language.BoundedFormula.toDNF` and `FirstOrder.Language.BoundedFormula.toCNF` - given a quantifier-free formula, these construct a semantically equivalent formula in disjunctive normal form and conjunctive normal form, respectively. --- - [ ] depends on: #16888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor t-logic	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	593-33203 1 year ago	608-57029 608 days ago	0-613 10 minutes
5995	FR-vdash-bot author:FR-vdash-bot	feat: add APIs about `Quotient.choice`	Some docs in this PR refer to the definition in #5576. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author RFC t-data	76/6	Mathlib/Data/Quot.lean	1	3	['YaelDillies', 'astrainfinita', 'gebner']	eric-wieser assignee:eric-wieser	586-47413 1 year ago	711-68074 711 days ago	285-35716 285 days
13156	erdOne author:erdOne	refactor(Algebra/Module/LocalizedModule): Redefine `LocalizedModule` in terms of `OreLocalization`.	--- - [x] depends on: #13151 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	519/628	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	8	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	581-54553 1 year ago	581-54553 581 days ago	51-84473 51 days
16348	urkud author:urkud	refactor(Topology): require `LinearOrder` with `OrderTopology`	While the definition formally makes sense for a preorder, this topology is usually not the right one for a non-linear order (e.g., `Real × Real`). See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Open.20Ioi) --- This PR doesn't cleanup any API, I'm going to do it in a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	33/46	Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/Sign.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Filter.lean,Mathlib/Topology/Order/MonotoneContinuity.lean	6	10	['YaelDillies', 'github-actions', 'jcommelin', 'urkud']	nobody	581-54177 1 year ago	622-111 622 days ago	3-83049 3 days
13965	pechersky author:pechersky	feat(Data/DigitExpansion): reals via digit expansion are complete	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #13964	merge-conflict blocked-by-other-PR t-data	3876/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Add.lean,Mathlib/Data/DigitExpansion/Defs.lean,Mathlib/Data/DigitExpansion/Hensel.lean,Mathlib/Data/DigitExpansion/Integer/Basic.lean,Mathlib/Data/DigitExpansion/Integer/Mul.lean,Mathlib/Data/DigitExpansion/Real/Basic.lean,Mathlib/Data/DigitExpansion/Real/CompleteSpace.lean,Mathlib/Data/DigitExpansion/Real/ConditionallyComplete.lean,docs/references.bib	10	4	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	580-4945 1 year ago	698-37564 698 days ago	0-600 10 minutes
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-data new-contributor merge-conflict awaiting-author	226/0	Mathlib.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/GrayCode.lean,Mathlib/Data/Nat/Size.lean	5	5	['Rida-Hamadani', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	575-55861 1 year ago	724-37959 724 days ago	16-49744 16 days
13514	madvorak author:madvorak	feat(Computability/ContextFreeGrammar): closure under union	- [ ] depends on: #15895 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	562-67189 1 year ago	640-41170 640 days ago	72-28417 72 days
9654	urkud author:urkud	feat: add `@[mk_eq]` version of `@[mk_iff]`	The new attribute generates theorems like ```lean List.chain_eq : @List.Chain = fun {α} R a a_1 => a_1 = [] ∨ ∃ b l, R a b ∧ List.Chain R b l ∧ a_1 = b :: l ``` and is useful to rewrite in a theorem that argues about the properties of an unapplied inductive predicate. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	63/9	Mathlib/Lean/Meta.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean,test/MkIffOfInductive.lean	3	6	['Vierkantor', 'github-actions', 'urkud']	nobody	561-13582 1 year ago	832-63281 832 days ago	25-70825 25 days
16704	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.Data.Ordering.Dickson): Dickson orders	Dickson orders are a particular class of well founded orders characterized by the fact that every nonempty set has finitely many minimal elements. They appear in the classical theory of Groebner bases because it is easier to prove that some sets are well founded using this property. WiP. In the `tfae` function, property 2 is exactly `Set.PartiallyWellOrderedOn`, so the PR should be rewritten so as to use that property (and not define `IsDickson`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	324/0	Mathlib.lean,Mathlib/Data/Ordering/Dickson.lean,scripts/noshake.json	3	9	['AntoineChambert-Loir', 'b-mehta', 'github-actions']	nobody	560-78539 1 year ago	611-67370 611 days ago	2-84515 2 days
16355	Ruben-VandeVelde author:Ruben-VandeVelde	feat: odd_{add,sub}_one	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	12/0	Mathlib/Algebra/Ring/Int.lean,Mathlib/Algebra/Ring/Parity.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'urkud']	nobody	560-26336 1 year ago	625-14782 625 days ago	0-57608 16 hours
14598	Command-Master author:Command-Master	chore: add typeclasses to unify various `add_top`, `add_eq_top`, etc.	Add the four typeclasses `IsTopAbsorbing`, `IsBotAbsorbing`, `NoTopSum`, `NoBotSum`, as additive equivalents for `MulZeroClass` and `NoZeroDivisors`. Add instances of these for `ENNReal`, `WithTop α`, `WithBot α`, `PUnit`, `EReal`, `PartENat`, `Measure`, `Interval` and `Filter`. Also split `Algebra/Order/AddGroupWithTop` to `Algebra/Order/Group/WithTop` and `Algebra/Order/Monoid/WithTop` --- Previous usages of lemmas with quantified names like `WithTop.add_top` have to be changed to just `add_top`. `add_lt_top` is `@[simp]`, in accordance with `ENNReal.add_lt_top` being `@[simp]`. This affects `WithTop.add_lt_top` which previously hadn't been `@[simp]`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-order new-contributor label:t-algebra$	264/195	Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib.lean,Mathlib/Algebra/Order/Group/WithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/PUnitInstances/Order.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Analytic/Meromorphic.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/ENorm.lean,Mathlib/Analysis/SpecialFunctions/JapaneseBracket.lean,Mathlib/Analysis/SpecialFunctions/Log/ENNRealLog.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/Data/Real/EReal.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Integral/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Martingale/Convergence.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean	57	30	['Command-Master', 'YaelDillies', 'github-actions']	nobody	558-84137 1 year ago	558-84137 558 days ago	7-45599 7 days
16885	metinersin author:metinersin	feat(ModelTheory/Complexity): define literals	Defines `FirstOrder.Language.BoundedFormula.IsLiteral` and `FirstOrder.Language.BoundedFormula.simpleNot` - an auxiliary operation that takes the negation of a formula and does some simplification. --- - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-logic	148/5	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	20	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	556-40258 1 year ago	592-29570 592 days ago	0-19926 5 hours
18716	jjaassoonn author:jjaassoonn	feat(Algebra/Module/GradedModule): quotient and subgrading	- [ ] depends on: #9820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR awaiting-CI merge-conflict label:t-algebra$	997/191	Counterexamples/HomogeneousPrimeNotPrime.lean,Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Module/GradedModule/Basic.lean,Mathlib/Algebra/Module/GradedModule/QuotientGrading.lean,Mathlib/Algebra/Module/GradedModule/Subgrading.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Quotient.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/no_lints_prime_decls.txt	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	556-39889 1 year ago	unknown	0-0 0 seconds
9341	winstonyin author:winstonyin	feat: Naturality of integral curves	Let `v` and `v'` be sections of the tangent bundle of manifolds `M` and `M'`, respectively, and let `f : M → M'` be a differentiable map. Then `f` maps integral curves of `v` to integral curves of `v'` if and only if `v` and `v'` are `f`-related. - [x] depends on: #8483 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-differential-geometry	45/0	Mathlib/Geometry/Manifold/IntegralCurve.lean,Mathlib/Topology/Algebra/Module/Basic.lean	2	9	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot', 'winstonyin']	nobody	553-5681 1 year ago	860-62151 860 days ago	0-28222 7 hours
13248	hcWang942 author:hcWang942	feat: basic concepts of auction theory	## Description Formalise some core concepts and results in auction theory: this includes definitions for first-price and second-price auctions, as well as several fundamental results and helping lemmas. This is the very first PR of the project formalizing core concepts and results in auction theory. Our group is working on more contributions on the formalization of game theory prefix. Co-authored-by: Ma Jiajun ## Reference Roughgarden, Tim. *Twenty Lectures on Algorithmic Game Theory*. Cambridge University Press, 2020. [Link](https://www.cambridge.org/core/books/twenty-lectures-on-algorithmic-game-theory/A9D9427C8F43E7DAEF8C702755B6D72B) --- - [x] Will depend on #14163 once that PR is merged. The Fintype lemmas introduced by this PR have been added in that PR and will be removed from here once that PR gets merged ## Current plan for formalization of Game Theory The current plan for the formalizing of Game Theory include: #### 1. Auction Theory. 🎉 _(200+ lines, this PR)_ - Essential definitions of Sealed-bid auction, First-price auction and Second-price auction. - First-price auction has no dominant strategy. - Second-price auction has dominant strategy. (Second-price auction is DSIC) #### 2. Mechanism design & Myerson's Lemma. 🎉 (400+ lines, pending for modification to Mathlib Standard) - Mechanism design An allocation rule is implementable if there exists - Dominant Strategy Incentive Compatible (DSIC) payment rule - An allocation rule is monotone if for every bidder’s gain is nondecreasing w.r.t. her/his bid - Myerson's Lemma Implementable ⇔ Monotone In the above case, the DSIC payment rule is unique. #### 3. von Neumann‘s Minimax Theorem. 🎉 (800+ lines, pending for modification to Mathlib Standard) - Equilibrium in zero sum game - Formalization strategy: via Loomis’s theorem. #### 4. Nash Equilibrium. 🎉 (pending for modification to Mathlib Standard) #### 5. Brouwer fixed-point theorem. (Work in Progress) #### 6. More Mechanism design. (Planning)	merge-conflict awaiting-author new-contributor t-logic	204/0	Mathlib.lean,Mathlib/GameTheory/Auction/Basic.lean,docs/references.bib	3	148	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'grunweg', 'hcWang942', 'tb65536', 'urkud', 'vihdzp']	hcWang942 assignee:hcWang942	551-79090 1 year ago	565-65278 565 days ago	109-82807 109 days
9344	erdOne author:erdOne	feat: Add `AddGroup.FG` -> `Module.Finite ℤ` as instances	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	4/0	Mathlib/RingTheory/Finiteness.lean	1	4	['alreadydone', 'erdOne', 'leanprover-bot']	nobody	550-63483 1 year ago	849-63926 849 days ago	21-27905 21 days
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology t-order	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	549-73237 1 year ago	700-68873 700 days ago	63-69226 63 days
16637	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` of `(Add)Monoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	46/51	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	20	3	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	549-72475 1 year ago	614-79831 614 days ago	1-49655 1 day
8661	joelriou author:joelriou	feat(CategoryTheory/Sites): descent of sheaves	In this PR, it is shown that the category of sheaves on a site `(C, J)` identifies as a full subcategory of a category of families of sheaves equipped with a descent data (for a family of objects which cover the final object). Under suitable conditions, it shall be shown that this is an equivalence of categories (TODO). --- This shall be split in small PRs later. - [x] depends on: #8622 - [x] depends on: #8632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	1396/26	Mathlib.lean,Mathlib/CategoryTheory/Over.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Descent.lean,Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean,Mathlib/CategoryTheory/Sites/InducedTopology.lean,Mathlib/CategoryTheory/Sites/ObjectsCoverTop.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	10	3	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	546-49457 1 year ago	unknown	0-0 0 seconds
10476	shuxuezhuyi author:shuxuezhuyi	feat(Topology/UniformSpace): define uniform preordered space	We define the semi-uniform structure and the uniform preordered space. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	94/0	Mathlib.lean,Mathlib/Topology/UniformSpace/UniformOrder.lean,docs/references.bib	3	2	['shuxuezhuyi']	nobody	545-36111 1 year ago	773-63539 773 days ago	52-19273 52 days
17593	astrainfinita author:astrainfinita	chore(Algebra/Order/GroupWithZero/Unbundled): deprecate useless lemmas, use `ZeroLEOneClass`	There are still some useless lemmas that were simply ported from `Algebra.Order.Monoid.Lemmas`, such as just chain an existing lemma with an assumption and lemmas whose assumptions imply `1 ≤ 0`. This PR removes them. Also, some lemmas have both assumptions like `1 < a` `0 < a`. This PR uses `ZeroLEOneClass` to remove redundant assumptions. --- - [ ] depends on: #17623 Ported from https://github.com/leanprover-community/mathlib/pull/16525 and https://github.com/leanprover-community/mathlib/pull/18158 Adapted from #9250. This version is easier to review. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR t-order label:t-algebra$	188/48	Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Order/Field.lean	6	4	['astrainfinita', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	544-59453 1 year ago	585-45034 585 days ago	0-74903 20 hours
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip t-order label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['YaelDillies', 'astrainfinita', 'github-actions', 'j-loreaux']	nobody	544-59453 1 year ago	551-52012 551 days ago	33-64877 33 days
17624	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): generalize lemmas	--- - [ ] depends on: #17623 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR t-order label:t-algebra$	121/26	Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	541-10225 1 year ago	585-43904 585 days ago	0-465 7 minutes
17513	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchies when using `map_*` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra awaiting-bench label:t-algebra$	5/3	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	2	10	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	539-55647 1 year ago	583-57512 583 days ago	4-72589 4 days
17515	FR-vdash-bot author:FR-vdash-bot	perf: do not need `simp low` now	--- - [ ] depends on: #17513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	12/10	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/NumberTheory/LucasLehmer.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	539-55646 1 year ago	588-43158 588 days ago	0-380 6 minutes
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	538-60892 1 year ago	538-60892 538 days ago	7-68089 7 days
19337	zeramorphic author:zeramorphic	feat(Data/Finsupp): generalise `Finsupp` to any "zero" value	Remove the explicit dependence of `Finsupp` on `[Zero M]`, instead defining `Finsupp'` (better name pending) to be functions that are equal to a fixed value `z : M` cofinitely often. This PR is intended to do the initial work of replacing the definition of `Finsupp` with an instantiation of the more general definition, without adding any appropriate API. If accepted, the API development will follow in later PRs. Issues to consider: - Naming of `Finsupp'.` - Where should `Finsupp'` lemmas go? Do they need their own file/folder under `Data/`? Relevant Zulip threads: - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp.20generalisations - https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finsupp-like.20partial.20function Comments are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	203/83	Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean,Mathlib/RingTheory/PowerBasis.lean,scripts/nolints_prime_decls.txt	13	5	['github-actions', 'vihdzp', 'zeramorphic']	nobody	536-36969 1 year ago	536-36969 536 days ago	4-60621 4 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	50/28	Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	4	['astrainfinita', 'github-actions', 'leanprover-bot']	nobody	525-2638 1 year ago	525-2638 525 days ago	31-53021 31 days
19125	yhtq author:yhtq	feat: add theorems to transfer `IsGalois` between pairs of fraction rings	feat: add theorems to transfer `IsGalois` between pairs of fraction rings. - [x] depends on: #18404 - [x] depends on: #19124 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra new-contributor label:t-algebra$	121/0	Mathlib.lean,Mathlib/FieldTheory/Galois/IsFractionRing.lean,Mathlib/RingTheory/Localization/FractionRing.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	522-15107 1 year ago	548-62889 548 days ago	0-1980 33 minutes
18841	hrmacbeth author:hrmacbeth	chore: change some `linarith`s to `linear_combination`s	Change 100 `linarith`s to `linear_combination`s; this is generally a slight speedup. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #18714 (not strictly blocked by this, but the speed comparison will be more informative after it)	merge-conflict WIP	106/107	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2021Q1.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Probability/Distributions/Pareto.lean	30	29	['github-actions', 'grunweg', 'hrmacbeth', 'jcommelin', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	520-62433 1 year ago	542-84679 542 days ago	3-28253 3 days
11142	hmonroe author:hmonroe	feat(ProofTheory): Define logical symbols abstractly; opens new top-level section, drawing from lean4-logic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	468/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/LogicSymbol.lean	3	19	['PatrickMassot', 'YaelDillies', 'avigad', 'fpvandoorn', 'github-actions']	nobody	514-72253 1 year ago	711-45902 711 days ago	94-3235 94 days
11210	hmonroe author:hmonroe	Test commit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1950/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/Calculus.lean,Mathlib/ProofTheory/FirstOrder/Arith/Language.lean,Mathlib/ProofTheory/FirstOrder/Basic/Syntax/Term.lean,Mathlib/ProofTheory/LogicSymbol.lean,Mathlib/ProofTheory/Matrix.lean,Mathlib/ProofTheory/Semantics.lean,Mathlib/ProofTheory/System.lean,docs/references.bib	10	100	['github-actions']	nobody	514-72252 1 year ago	800-61733 800 days ago	2-67901 2 days
19621	Command-Master author:Command-Master	feat: Multiplicity and prime-adic valuation of derivations	--- - [ ] depends on: #19596 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR large-import label:t-algebra$	397/13	Mathlib.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Derivation/Multiplicity.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	514-54513 1 year ago	534-79862 534 days ago	0-666 11 minutes
18262	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): exterior powers of presheaves of modules	--- - [x] depends on: #18261 - [ ] depends on: #18236 - [ ] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR t-category-theory merge-conflict label:t-algebra$	874/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean,Mathlib/Algebra/Category/ModuleCat/Pseudofunctor.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	514-45808 1 year ago	unknown	0-0 0 seconds
15269	kkytola author:kkytola	feat: Add ENNReal.floor	A right-continuous floor function on `ENNReal`. --- - [x] depends on: #13938 - [ ] depends on: #15773 (general type class for `ENat`-valued floor functions) - [x] depends on: #15380 (topology on `ENat` is needed to state right continuity of the floor function) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR t-order merge-conflict awaiting-author label:t-algebra$	445/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENNReal/Floor.lean,Mathlib/Data/Nat/Lattice.lean	4	18	['YaelDillies', 'github-actions', 'kkytola', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	501-26742 1 year ago	650-21808 650 days ago	0-3440 57 minutes
15773	kkytola author:kkytola	feat: Add type class for ENat-valued floor functions	This PR adds a type class for extended natural number -valued floor functions. This is split off from #15269, where the suggestions were to make the floor function on ENNReal ENat-valued and to have an API mimicling FloorSemirings. Besides ENNReal, at least ENNRat would naturally satisfy the general type class. --- Two things are worth noting: * To fully mimic `FloorSemiring` API, also ceiling functions need to be added. The plan is to do that in a later PR. * The PR introduces the class `CastNatENatClass` to ensure that `natCast` and a coercion from `ENat` behave in the natural and order-respecing manner. This feels a little ad hoc, but such assumptions are needed for general `ENat`-valued floor functions to behave well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-order	231/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENat/Basic.lean	3	5	['YaelDillies', 'github-actions', 'kkytola', 'urkud']	nobody	501-26619 1 year ago	577-25972 577 days ago	66-24436 66 days
3251	kmill author:kmill	feat: deriving `LinearOrder` for simple enough inductive types	Uses the same machinery underlying the `Fintype` derive handler to derive a lexicographical `LinearOrder` for non-recursive inductive types that have no indices. In principle more complicated types can have `LinearOrder`s, but that would require a more sophisticated implementation. --- - [x] depends on: #3198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-meta	82/0	Mathlib.lean,Mathlib/Tactic/DeriveLinearOrder.lean	2	5	['ChrisHughes24', 'kim-em', 'kmill', 'vihdzp']	nobody	499-1272 1 year ago	1125-3303 1125 days ago	1-80343 1 day
16120	awainverse author:awainverse	feat(ModelTheory/Algebra/Ring/Basic): Ring homomorphisms are a `StrongHomClass` for the language of rings	Adds an `IsAlgebraic` instance to the language of rings Adds a `StrongHomClass` instance to the type of ring homomorphisms between rings with `CompatibleRing` structures --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra RFC t-logic label:t-algebra$	34/13	Mathlib/ModelTheory/Algebra/Ring/Basic.lean	1	10	['ChrisHughes24', 'YaelDillies', 'awainverse', 'github-actions', 'jcommelin']	nobody	497-18812 1 year ago	497-18812 497 days ago	135-29017 135 days
20459	Ruben-VandeVelde author:Ruben-VandeVelde	chore: fix names of roots_C_mul_X_{add,sub}_C_of_IsUnit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	11/5	Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	2	['eric-wieser', 'github-actions']	nobody	495-43255 1 year ago	495-43255 495 days ago	4-64422 4 days
20527	trivial1711 author:trivial1711	refactor(Topology/UniformSpace/Completion): more descriptive names for `α → Completion α`	- We rename the various maps `α → Completion α` in order to make their names more consistent. - Let `α` be a uniform space. We rename the uniformly continuous function `α → Completion α` from `UniformSpace.Completion.coe'` to `UniformSpace.Completion.coe`. - Let `α` be a uniform additive group. We rename the additive group homomorphism `α →+ Completion α` from `UniformSpace.Completion.toCompl` to `UniformSpace.Completion.coeAddHom`. - Let `α` be a uniform ring. The ring homomorphism `α →+* Completion α` is called `UniformSpace.Completion.coeRingHom`; its name is unchanged. - Let `α` be a normed space over a field `𝕜`. We rename the linear isometry `α →ₗᵢ[𝕜] Completion α` from `UniformSpace.Completion.toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ`. - Let `α` be a normed space over a field `𝕜`. We rename the continuous linear map `α →L[𝕜] Completion α` from `UniformSpace.Completion.toComplL` to `UniformSpace.Completion.coeL`. - Let `α` be a normed additive group. We rename the norm preserving homomorphism `NormedAddGroupHom α (Completion α)` from `NormedAddCommGroup.toCompl` to `UniformSpace.Completion.coeNormedAddGroupHom`. - We analogously rename some other theorems. - We add some trivial theorems (all of which are proved by `rfl`) that state that the functions considered above are equal. We give all of them the `simp` and `norm_cast` attributes. - We add a new theorem `UniformSpace.Completion.coeAddHom_eq_coe` that states that `UniformSpace.Completion.coeAddHom` and `UniformSpace.Completion.coe` are equal as functions. - We similarly add a new theorem `UniformSpace.Completion.coeRingHom_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplₗᵢ` to `UniformSpace.Completion.coeₗᵢ_eq_coe`. - We rename the theorem `UniformSpace.Completion.coe_toComplL` to `UniformSpace.Completion.coeL_eq_coe`. - We similarly add a new theorem `UniformSpace.Completion.coeNormedAddGroupHom_eq_coe`. - We change all occurrences of the string `((↑) : α → Completion α)` to `(coe : α → Completion α)` or just `coe`. - We put the statements of some theorems into simp normal form by using the plain function `coe` rather than the homomorphisms that carry more structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	130/92	Mathlib/Analysis/Analytic/Uniqueness.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/SpecialFunctions/NonIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/Nonarchimedean.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Category/UniformSpace.lean,Mathlib/Topology/MetricSpace/Completion.lean,Mathlib/Topology/UniformSpace/Completion.lean	17	4	['eric-wieser', 'github-actions', 'trivial1711']	nobody	490-49844 1 year ago	490-49844 490 days ago	6-66637 6 days
17739	Aaron1011 author:Aaron1011	feat(Topology/Order/DenselyOrdered): prove Not (IsOpen) for intervals	Prove that Iic/Ici/Ioc/Ico/Icc intervals are not open in densely ordered topologies with no min/max element --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	488-37119 1 year ago	581-28689 581 days ago	0-4704 1 hour
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-data label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	488-36874 1 year ago	488-36874 488 days ago	76-66907 76 days
20656	Komyyy author:Komyyy	feat(Mathlib/Geometry/Manifold/VectorBundle/Sphere): convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`	Current Mathlib has no easy way to define function from a manifold to tangent bundles of sphere: `T𝕊ⁿ`. This PR gives this: `sphereTangentMap`. This convert orthogonal smooth `M → 𝕊ⁿ` & `M → ℝⁿ⁺¹` to smooth `M → T𝕊ⁿ`. I also proved that if `f : M → 𝕊ⁿ` & `g : M → ℝⁿ⁺¹` are smooth then `sphereTangentMap` of `f` & `g` is smooth too. --- ⚠ CAUTION I formalized this in my spare time. I don't have the energy to maintain the PR, but I create this PR so this may helps everyone. The only one thing to do is proof cleanup. TODO: - [x] `contDiff_uncurry_stereoInvFunAux` & `coe_sphere_comp_stereoInvFun` may have to be moved to `Mathlib.Geometry.Manifold.Instances.Sphere`. - [ ] Proof cleanup. Current proof may be redundant and ugly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-differential-geometry	246/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/Sphere.lean	3	1	['github-actions']	nobody	487-71808 1 year ago	unknown	0-0 0 seconds
15711	znssong author:znssong	feat(Combinatorics/SimpleGraph): Some lemmas about walk, cycle and Hamiltonian cycle	--- These lemmas are separated from the `meow-sister/BondyChvatal` branch and will be needed for the proof of the Bondy-Chvátal theorem. - [x] depends on: #15536 - [x] depends on: #16294	merge-conflict awaiting-author t-combinatorics new-contributor	407/3	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	22	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'znssong']	nobody	487-56205 1 year ago	608-67366 608 days ago	9-13962 9 days
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	merge-conflict blocked-by-other-PR t-combinatorics new-contributor	903/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/BondyChvatal.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	8	3	['github-actions', 'grunweg']	nobody	487-56205 1 year ago	644-73559 644 days ago	0-1791 29 minutes
18629	tomaz1502 author:tomaz1502	feat(Computability.Timed): Formalization of runtime complexity of List.merge	This PR adds the formalization of the runtime complexity of the merge function, defined in `Data/List/Sort`. Requires: https://github.com/leanprover-community/mathlib4/pull/15450 References: - Previous PR on mathlib3: https://github.com/leanprover-community/mathlib3/pull/14494/ - First discussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/BSc.20Final.20Project/near/220647062 - Second disussion on Zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Formalization.20of.20Runtime.20Complexity.20of.20Sorting.20Algorithms/near/284184450 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	487-22124 1 year ago	527-21737 527 days ago	33-11262 33 days
8362	urkud author:urkud	feat(Asymptotics): define `ReflectsGrowth`	--- - [x] depends on: #8349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	268/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/ReflectsGrowth.lean	2	14	['YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	485-29378 1 year ago	676-81205 676 days ago	240-47513 240 days
6692	prakol16 author:prakol16	feat: disjoint indexed union of local homeomorphisms	Add disjoint indexed union of local equivs and local homeomorphisms --- This is leading up to PRing some things related to covering spaces that I wrote a long time ago in lean 3 but never submitted a PR for. Note that this was converted using mathport. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	126/0	Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Topology/PartialHomeomorph.lean	2	4	['alreadydone', 'github-actions', 'winstonyin']	nobody	485-13974 1 year ago	577-23993 577 days ago	118-5497 118 days
18461	hannahfechtner author:hannahfechtner	feat: left and right common multiples mixins	add mixins for left and right common multiples. These carry the data of what factors are used to create the common multiples --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	483-69704 1 year ago	483-69704 483 days ago	69-35596 69 days
19291	PieterCuijpers author:PieterCuijpers	feat(Algebra/Order/Hom): add quantale homomorphism	Definition of quantale homomorphisms as functions that are both semigroup homomorphisms and complete lattice homomorphisms. --- - [x] depends on: #19810 - [x] depends on: #19811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	209/0	Mathlib.lean,Mathlib/Algebra/Order/Hom/Quantale.lean,scripts/noshake.json	3	29	['PieterCuijpers', 'YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	482-43783 1 year ago	488-11184 488 days ago	29-51482 29 days
19352	hrmacbeth author:hrmacbeth	chore: change some `nlinarith`s to `linear_combination`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	13/13	Archive/Imo/Imo2021Q1.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/NumberTheory/Modular.lean	8	4	['github-actions', 'hrmacbeth', 'leanprover-bot']	nobody	480-72994 1 year ago	542-84699 542 days ago	0-8636 2 hours
20372	jvlmdr author:jvlmdr	feat(MeasureTheory/Function): Add ContinuousLinearMap.bilinearCompLp(L)	Introduce ContinuousLinearMap.bilinearCompLp and bilinearCompLpL. Generalize eLpNorm_le_eLpNorm_mul_eLpNorm theorems to include constant C in bound condition. --- Expect this may be useful for defining tempered distributions from functions in `L^p`. The definitions more or less follow `ContinuousLinearMap.compLp...`. Names are loosely analogous to `ContinuousLinearMap.bilinearComp` and `SchwartzMap.bilinLeftCLM`. Note: I preferred the spelling `hpqr : p⁻¹ + q⁻¹ = r⁻¹` with `f` in `L^p` and `g` in `L^q` to `hpqr : 1 / p = 1 / q + 1 / r`. It's easier to obtain from `ENNReal.IsConjExponent` too. A few questions: - [ ] I defined `bilinear{Left,Right}LpL` in addition to `bilinearCompLpL` because `LinearMap.mkContinuous₂` is marked as `noncomputable` and `LinearMap.mkContinuous` is not. Is this worth the extra definitions? (Note: This is not visible in the source due to `noncomputable section`.) - [ ] Should I use `C : ℝ` instead of `C : NNReal` for `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'`? - [ ] Is it going to be painful to have `[Fact (1 ≤ p)] [Fact (1 ≤ q)] [Fact (1 ≤ r)]`? I don't think there's a way to avoid it though. Maybe providing specialized versions for `p.IsConjExponent q` with `L^1`? Naming: - [ ] Is it satisfactory to add a `'` to the `eLpNorm_le_eLpNorm_mul_eLpNorm ` definitions in `CompareExp.lean` where `≤ ‖f x‖ * ‖g x‖` has been replaced with `≤ C * ‖f x‖ * ‖g x‖`? These could replace the existing theorems, although I don't want to break backwards compatibility. There are 5 instances: `eLpNorm_le_eLpNorm_top_mul_eLpNorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm_top'`, `eLpNorm'_le_eLpNorm'_mul_eLpNorm''`, `eLpNorm_le_eLpNorm_mul_eLpNorm_of_nnnorm'`, `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm'` (I'm not sure why the existing theorem `eLpNorm_le_eLpNorm_mul_eLpNorm'_of_norm` has an internal `'`) - [ ] Is `bilinearLeftLpL` a suitable name? Other options: `bilinearCompLpLeftL`, `bilinearCompLeftLpL`, `bilinLeftLpL` (analogous to `SchwartzMap.bilinLeftCLM`) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-measure-probability new-contributor	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	475-61131 1 year ago	475-61131 475 days ago	27-43617 27 days
2605	eric-wieser author:eric-wieser	chore: better error message in linarith	On this mwe: ```lean import Mathlib.Tactic.Linarith example (s : Set ℕ) (h : s = s) : 0 ≤ 1 := by linarith ``` this now indicates where the internal error is coming from. Is there a better way of chaining errors than this? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	473-51724 1 year ago	1120-83263 1120 days ago	51-42225 51 days
11837	trivial1711 author:trivial1711	feat: completion of a uniform multiplicative group	Multiplicativize `Topology.Algebra.GroupCompletion`. That is, rewrite it in the multiplicative setting and recover the original results using `@[to_additive]`. - Because `@[to_additive]` doesn't work with `noncomputable section` (https://github.com/leanprover/lean4/pull/2610), some instances with `@[to_additive]` need to be explicitly marked with `noncomputable instance`. - One might be tempted to multiplicativize this definition from `Topology.Algebra.GroupCompletion`: ```lean instance [UniformSpace α] [Add α] : Add (Completion α) := ⟨Completion.map₂ (· + ·)⟩ ``` to this: ```lean @[to_additive] instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨Completion.map₂ (· * ·)⟩ ``` However, as Eric Wieser pointed out, doing so would create a bad diamond with the definition ```lean instance [UniformSpace α] [TopologicalRing α] [UniformAddGroup α] [Ring α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` in `Topology.Algebra.UniformRing`. How should this diamond be resolved? Well, the definition of multiplication that uses `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` is the "correct" one. For example, it yields the correct result if `α` is `ℚ`, unlike the definition that uses `Completion.map₂ (· * ·)`. (This is because `Completion.map₂` yields junk values if used on a function which is not uniformly continuous. Note, however, that if multiplication on `α` is uniformly continuous, then `Completion.map₂ (· * ·)` and `curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))` are propositionally equal.) So, following Eric's suggestion, we remove the definition that uses `Completion.map₂ (· * ·)`, and generalize the other definition to any uniform space with a multiplication operation: ```lean @[to_additive] noncomputable instance [UniformSpace α] [Mul α] : Mul (Completion α) := ⟨curry <\| (denseInducing_coe.prod denseInducing_coe).extend ((↑) ∘ uncurry (· * ·))⟩ ``` This requires slightly modifying some of the proofs in `Topology.Algebra.GroupCompletion`. For example, suppose that `α` is a uniform group. Since we can no longer use `Completion.continuous_map₂`, it becomes more efficient to prove that the multiplication, inversion, and division operations on `Completion α` are uniformly continuous before we prove that `Completion α` is a group. - Previously, `Topology.Algebra.GroupCompletion` had an instance: ```lean instance [UniformSpace α] [Sub α] : Sub (Completion α) := ... ``` Naively multiplicativizing this would yield ```lean @[to_additive] instance [UniformSpace α] [Inv α] : Inv (Completion α) := ... ``` Unfortunately, this would conflict with `Topology.Algebra.UniformField`, which already instantiates `Inv (Completion α)` when `α` is a uniform field. Instead, we use two different `instance` declarations. (If `α` is an additive group, then this instantiates `Neg (Completion α)` twice, and the instances are syntactically equal.) ```lean @[to_additive] noncomputable instance [UniformSpace α] [Group α] : Inv (Completion α) := ... instance [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` This avoids the bad diamond (because a uniform field can never be a `Group`) while remaining backward compatible. Note that the `@[to_additive]` is necessary here, because it maintains the link between the additive setting and multiplicative setting. We use a similar method to instantiate `Div (Completion α)`. - Some definitions in this file involve a module structure on `α`. We leave these as is and do not attempt to multiplicativize them at all. - The instance of `DistribMulAction` must be multiplicativized to an instance of `MulDistribMulAction` manually. Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Completion.20of.20a.20uniform.20multiplicative.20group --- # (Small) Issue Recall the following trick that this pull request uses to define inversion and negation on uniform spaces. The idea is that we define negation on the completion of any uniform space that has a negation operation, but we define inversion on only the completion of a uniform space that has the structure of a multiplicative group. We do this to avoid creating a bad diamond with the inversion operation on a uniform field. ```lean @[to_additive] noncomputable instance {α : Type} [UniformSpace α] [Group α] : Inv (Completion α) := ... instance {α : Type} [UniformSpace α] [Neg α] : Neg (Completion α) := ... ``` Now, suppose that we want to prove `coe_inv_of_group` (resp. `coe_neg`), which states that the coercion `α → Completion α` commutes with inversion (resp. negation). In the current version of this pull request, `coe_inv_of_group` (resp. `coe_neg`) only applies to uniform multiplicative (resp. additive) groups. However, we do not use the fact that multiplication (resp. addition) on `α` is uniformly continuous to prove it. We only use the fact that inversion (resp. negation) is continuous. So, what we really want is to have more general statements that look like this: ```lean theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Note that `coe_inv_of_group` needs the assumption `[Group α]`, because otherwise inversion is not defined on `Completion α` at all. However, `coe_neg` does not need the analogous assumption `[AdditiveGroup α]`. The question is: If `coe_inv_of_group` and `coe_neg` are written in this more general form, how can we link them using `@[to_additive]`? Here is one option, but it obviously leaves something to be desired. ```lean @[to_additive coe_neg_do_not_use_this_use_the_more_general_version] theorem coe_inv_of_group {α : Type} [UniformSpace α] [Group α] [ContinuousInv α] : ... theorem coe_neg {α : Type} [UniformSpace α] [Neg α] [ContinuousNeg α] : ... ``` Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra merge-conflict help-wanted t-topology label:t-algebra$	342/217	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	14	['eric-wieser', 'github-actions', 'trivial1711']	nobody	473-29229 1 year ago	502-41508 502 days ago	101-63310 101 days
12670	trivial1711 author:trivial1711	feat: completion of a nonarchimedean multiplicative group	We prove that the completion of a nonarchimedean multiplicative group is a nonarchimedean multiplicative group. --- - [x] depends on: #12669 - [ ] depends on: #11837 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra t-topology blocked-by-other-PR label:t-algebra$	358/228	Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/Normed/Group/HomCompletion.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/InfiniteSum/GroupCompletion.lean,Mathlib/Topology/Algebra/Nonarchimedean/Completion.lean,Mathlib/Topology/Algebra/UniformField.lean,Mathlib/Topology/Algebra/UniformMulAction.lean,Mathlib/Topology/Algebra/UniformRing.lean	9	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	473-29106 1 year ago	500-10562 500 days ago	50-17994 50 days
9449	hmonroe author:hmonroe	feat: Add Turing machine with the quintet definition (TMQ) and a chainable step function for each TM type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	467-80308 1 year ago	812-6960 812 days ago	53-6945 53 days
19697	quangvdao author:quangvdao	feat(BigOperators/Fin): Sum/product over `Fin` intervals	This PR adds new theorems about the sum/product of some vector over `Fin` intervals. One example is: ``` @[to_additive] theorem prod_Iic_succ (i : Fin n) : ∏ j ∈ Iic i.succ, v j = (∏ j ∈ Iic i.castSucc, v j) * v i.succ ``` --- - [x] depends on: #20360 This is in preparation for reworking `finSigmaFinEquiv` and `finProdFinEquiv` in #19013. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	87/12	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Order/Interval/Finset/Fin.lean	3	20	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	465-36326 1 year ago	499-72256 499 days ago	6-25961 6 days
19353	hrmacbeth author:hrmacbeth	chore: golf some term/rw proofs using `linear_combination`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	47/102	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean	7	5	['github-actions', 'grunweg', 'hrmacbeth', 'leanprover-bot']	grunweg assignee:grunweg	464-35447 1 year ago	542-84691 542 days ago	0-7781 2 hours
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import new-contributor merge-conflict awaiting-author t-topology	1189/813	Mathlib.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Compactness/DeltaGeneratedSpace.lean,Mathlib/Topology/Connected/LocPathConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Path.lean	9	22	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'peabrainiac']	nobody	463-18441 1 year ago	469-69358 469 days ago	39-21495 39 days
10678	adri326 author:adri326	feat(Topology/UniformSpace): prove that a uniform space is completely regular	Provides the pseudometric definition of a uniform space (for any open set `s` and `x ∈ s`, there exists a finite family of pseudometric spaces on `X` and an `ε > 0`, such that the intersection of the balls of these pseudometric spaces is a subset of `s`), and uses it to prove that `UniformSpace X` implies `CompletelyRegularSpace X`. --- This PR aims to close the gap of pi-base's theorem [T345](https://topology.pi-base.org/theorems/T000345), which says that topological groups are completely regular. We already have a proof that topological groups are uniform, but it turns out that we do not have any connection between `UniformSpace X` and `CompletelyRegularSpace X`. There is an equivalence between `UniformSpace X` and `CompletelyRegularSpace X`: the former implies the latter, and the latter implies the existence of the former. This PR provides the first half of this equivalence. The construction of the pseudometric definition is based on N. Bourbaki, Chapter 9, Theorem 4.1 The proof that a uniform space is completely regular is based on [the outline on mathexchange](https://math.stackexchange.com/questions/494718/how-to-prove-that-every-uniform-space-is-completely-regular). I tried to outline the major steps of the different proofs inside of comments; I can happily be more verbose to clear up any confusion. See [the corresponding Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Some.20missing.2C.20accessible.2C.20topology.20results) for more context. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	332/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/CompletelyRegular.lean	3	6	['ADedecker', 'adri326']	ADedecker assignee:ADedecker	462-29858 1 year ago	803-53537 803 days ago	17-44804 17 days
18785	erdOne author:erdOne	feat(CategoryTheory): command that generates instances for `MorphismProperty`	Co-authored-by: Calle Sönne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory t-meta	369/0	Mathlib.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean,scripts/noshake.json	4	19	['alexjbest', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'joelriou']	nobody	460-46368 1 year ago	481-74638 481 days ago	52-4682 52 days
16311	madvorak author:madvorak	feat(Computability): regular languages are context-free	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-computability	72/0	Mathlib.lean,Mathlib/Computability/Chomsky.lean,Mathlib/Computability/ContextFreeGrammar.lean	3	7	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'madvorak']	nobody	458-52787 1 year ago	unknown	0-0 0 seconds
19943	AlexLoitzl author:AlexLoitzl	feat(Computability): Add Chomsky Normal Form Grammar and translation	- Define Chomsky normal form grammars - Add language-preserving translation between context-free grammars and Chomsky normal form grammars Co-authored-by: Martin Dvorak martin.dvorak@matfyz.cz --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	3151/0	Mathlib.lean,Mathlib/Computability/ChomskyNormalForm/Basic.lean,Mathlib/Computability/ChomskyNormalForm/EmptyElimination.lean,Mathlib/Computability/ChomskyNormalForm/LengthRestriction.lean,Mathlib/Computability/ChomskyNormalForm/TerminalRestriction.lean,Mathlib/Computability/ChomskyNormalForm/Translation.lean,Mathlib/Computability/ChomskyNormalForm/UnitElimination.lean,Mathlib/Computability/ContextFreeGrammar.lean	8	59	['AlexLoitzl', 'YaelDillies', 'github-actions', 'kim-em', 'madvorak']	nobody	458-52540 1 year ago	465-64162 465 days ago	37-29014 37 days
21501	sksgurdldi author:sksgurdldi	feat(List): add sum_zipWith_eq_finset_sum	### Description: This PR adds the lemma `List.sum_zipWith_eq_finset_sum` to `Mathlib.Algebra.BigOperators.Group.Finset.Basic`. #### Statement: The sum of the `zipWith` operation on two lists equals the sum of applying the operation to corresponding elements of the two lists, indexed over the minimum of their lengths. #### Formal Statement: ```lean lemma sum_zipWith_eq_finset_sum [Inhabited α] [Inhabited β] [AddCommMonoid γ] {op : α → β → γ} (l : List α) (m : List β) : (List.zipWith op l m).sum = ∑ x ∈ (Finset.range (Nat.min l.length m.length)), op (l[x]!) (m[x]!) ``` #### Remarks: - This lemma provides a useful equivalence between `List.zipWith` and summation over a `Finset.range` indexed by `Nat.min l.length m.length`. - It can be helpful in algebraic manipulations involving list-based summations. #### Dependencies: No additional dependencies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra new-contributor label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	453-21311 1 year ago	453-21311 453 days ago	13-33168 13 days
12054	adomani author:adomani	feat: auto-bugs	This PR introduces a linter for suggesting bugs in tactics. See * #12077 * #12083 * #12084 for some bugs exposed by the test suite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	737/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/MetaTesting.lean,scripts/noshake.json,test/MetaTesting.lean	5	20	['adomani', 'eric-wieser', 'github-actions', 'joneugster', 'kim-em']	joneugster assignee:joneugster	453-8968 1 year ago	665-67386 665 days ago	45-6051 45 days
5062	adomani author:adomani	feat(Tactic/Prune + test/Prune): add `prune` tactic, for removing unnecessary hypotheses	This tactic removes very conservatively all local declarations that 1. do not appear in the main goal, 2. do not appear in a declaration that appears in the main goal, 3. ... and so on recursively. The main motivation for this tactic is that all available variables in the current `namespace/section` appear in the goal state, not just the ones that are needed for the statement to type-check. Using `prune` mitigates this situation. The tactic also admits an optional natural number argument: `prune n` removes all variables that have not appeared at the `(n+1)`-st stage in the above list. Thus, `prune 0` only leaves the variables needed for the statement to type-check. Also, for sufficiently large `n`, `prune n` is a synonym for `prune`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/substitute.20for.20.60include.2Fomit.60.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict modifies-tactic-syntax awaiting-author t-meta	181/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Prune.lean,test/Prune.lean	4	5	['adomani', 'j-loreaux', 'kmill']	nobody	452-62675 1 year ago	873-48006 873 days ago	195-57118 195 days
21433	grunweg author:grunweg	chore: change more lemmas to be about enorm instead of nnnorm	--- - [x] depends on: #21782 - [x] depends on: #21783 (and this PR modifies the file split, and file splits are painful to merge over) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author carleson t-measure-probability	172/71	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean	9	18	['RemyDegenne', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	451-27528 1 year ago	458-23593 458 days ago	2-37989 2 days
20454	urkud author:urkud	chore(TangentCone): review names	Also add some `@[simp]` attrs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis	201/139	Mathlib/Analysis/Analytic/IteratedFDeriv.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/Deriv/Abs.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/RestrictScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	25	3	['github-actions', 'sgouezel', 'urkud']	nobody	446-74108 1 year ago	496-27471 496 days ago	4-8272 4 days
16550	awainverse author:awainverse	feat(ModelTheory): A typeclass for languages expanding other languages	Defines `L.Expands L'` to consist of a privileged injective inclusion, `L'.Inclusion L`, from `L'` to `L`, corresponding to one language being a subset of the other in set-theoretic foundations. Replaces `L.IsOrdered` with `L.Expands Language.order` and `L.OrderLHom` with `Language.order.Inclusion L` Redefines `leSymb` in terms of `Language.order.Inclusion L` Deletions: - `FirstOrder.Language.IsOrdered` - `FirstOrder.Language.OrderLHom` - `instance : IsOrdered Language.order` - `sum.instIsOrdered` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	97/43	Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Order.lean	2	9	['YaelDillies', 'awainverse', 'github-actions']	nobody	446-26576 1 year ago	618-57807 618 days ago	0-61590 17 hours
10823	alexkeizer author:alexkeizer	feat: convert curried type functions into uncurried type functions	Adds a conversion `TypeFun.ofCurried : CurriedTypeFun.{u, v} n -> TypeFun.{u, v} n`, where `CurriedTypeFun.{u,v} n` is a (def-eq) abbreviation for `Type u -> ... -> Type u -> Type v`, i.e., the type of curried functions taking `n` arguments of type `Type u` to return an element of `Type v`, and `TypeFun.{u, v} n` is an abbreviation for `TypeVec.{u} n -> Type v`. It is generally more idiomatic to define type functions with multiple arguments in the curried style, but in the QPF development we use the uncurried equivalent `TypeVec n -> Type _`. Thus, having a canonical conversion from curried functions to uncurried gives us a canonical way to ask if a curried type function, say `Sum` is a QPF (namely, "is there an instance of `MvQPF (TypeFun.ofCurried Sum)`"). --- This is code ported from https://github.com/alexkeizer/QpfTypes, where this conversion is crucial in presenting a high-level interface, in terms of idiomatic, curried, type functions to users, while being built on QPFs (and thus, uncurried typefunctions) underneath. There is also a conversion in the other direction, from uncurried to curried, which I've decided to PR later, to keep this PR smaller and hopefully easier to review. - [x] depends on: #10818 (all changes to `Fin2.lean` are part of 10818, not the current PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	66/0	Mathlib.lean,Mathlib/Data/TypeFun.lean	2	9	['YaelDillies', 'alexkeizer', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	443-39169 1 year ago	694-23769 694 days ago	15-9013 15 days
13648	urkud author:urkud	feat(Topology/Module): generalize `ContinuousLinearMap.compSL`	Generalize `ContinuousLinearMap.compSL` to topological vector spaces. --- - [ ] depends on: #15217 This PR is not polished yet, but the main statement is there. @ADedecker This answers a question I asked you on Zulip a few months ago. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author t-topology t-analysis label:t-algebra$	23/18	Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	2	5	['fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	441-62259 1 year ago	679-45186 679 days ago	28-69042 28 days
20636	eric-wieser author:eric-wieser	feat: multiplication of intervals in rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	36/1	Mathlib/Algebra/Order/Interval/Basic.lean	1	16	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	440-34228 1 year ago	476-38005 476 days ago	17-17852 17 days
22340	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Beck-Chevalley Conditions)	Building on top of the API of `ExponentiableMorphism` in #22321, we state and prove Beck-Chevalley conditions. This will be crucial for our development of polynomial functors along exponentiable morphisms. Co-authored-by: Emily Riehl --- - [ ] depends on: #22321 - [ ] depends on: #22319 - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory large-import merge-conflict	1144/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/BeckChevalley.lean,docs/references.bib	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	439-50810 1 year ago	446-32737 446 days ago	0-17 17 seconds
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology new-contributor	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	439-47152 1 year ago	439-47152 439 days ago	16-76141 16 days
18470	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Normed.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra t-analysis label:t-algebra$	28/0	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean	2	9	['astrainfinita', 'github-actions', 'jcommelin', 'leanprover-bot']	nobody	435-18579 1 year ago	435-18579 435 days ago	129-16341 129 days
17368	Felix-Weilacher author:Felix-Weilacher	feat(Topology/Baire/BaireMeasurable): add the Kuratowski-Ulam theorem	Add the Kuratowski-Ulam theorem, which one can think of as a "Fubini" for Baire category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	187/1	Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/GDelta/Basic.lean	5	6	['Felix-Weilacher', 'github-actions', 'urkud']	nobody	433-42648 1 year ago	570-54167 570 days ago	22-48725 22 days
8767	eric-wieser author:eric-wieser	refactor(Cache): tidy lake-manifest parsing in Cache	This now respects local copies of Mathlib dependencies (though in practice these invalidate the online cache because to point to local copies of Mathlib, the hash for `lakefile.lean` and `lake-manifest.json` is first invalidated). --- - [x] depends on: #11492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	432-18311 1 year ago	613-70661 613 days ago	119-35643 119 days
15578	znssong author:znssong	feat(Function): Fixed points of function `f` with `f(x) >= x`	We added some lemmas of fixed points of function `f` with `f(x) >= x`, where `f : α → α` is a function on a finite type `α`. This will be needed in proof of Bondy-Chvátal theorem. --- See also branch `meow-sister/BondyChvatal`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis new-contributor	82/0	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Increasing.lean	3	32	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'urkud', 'vihdzp', 'znssong']	nobody	431-42978 1 year ago	614-46207 614 days ago	29-48368 29 days
22660	Ruben-VandeVelde author:Ruben-VandeVelde	chore: follow naming convention around Group.IsNilpotent	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	427-69407 1 year ago	427-69407 427 days ago	10-48025 10 days
13999	adomani author:adomani	feat: a linter to flag potential confusing conventions	Currently, the linter flags all uses of * `a - b` where `a b : Nat`; * `a / b` where `a b : Nat` or `a b : Int`; * `a / 0` more or less whenever the type of `a` has a `0` and a division. This comes up often when starting to use Lean and hopefully the flag can help mitigate initial confusions. When the local context contains the relevant inequality/divisibility hypothesis, the linter is quiet. A recent [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/not.20understanding.20deliberate.20error.20with.20.60ring.60.20over.20.E2.84.95/near/445879310) --- To make sure that the linter does not produce errors, #14007 activates the linter on "all" of mathlib. The expectation is that no error is thrown, just warnings. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	251/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Papercut.lean,MathlibTest/Papercut.lean	4	24	['Julian', 'YaelDillies', 'adomani', 'eric-wieser', 'github-actions']	nobody	427-15041 1 year ago	687-78932 687 days ago	7-47589 7 days
19013	quangvdao author:quangvdao	feat(Algebra/BigOperators/Fin): Add `finSigmaFinEquiv`	This PR adds `finSigmaFinEquiv` which is the equivalence `(i : Fin m) × Fin (n i) ≃ Fin (∑ i, n i)`. This is the dependent version of `finProdFinEquiv`. CI should be passing, but there are two things I'd like feedback on: 1. When defining the mappings, I have to consider `m = 0` separately. Is there a more uniform definition? 2. I'm proving this as a step toward defining `Fin.join`, which is the analogue of `List.join`. I can now technically define `Fin.join` as: ``` variable {a : Fin n → ℕ} {α : (i : Fin n) → (j : Fin (a i)) → Sort*} def join (v : (i : Fin n) → (j : Fin (a i)) → α i j) (k : Fin (∑ i, a i)) : α (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 := v (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 ``` but this looks horrible. This highly motivates refactoring `invFun` as two new definitions: ``` def func1 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin n := sorry def func2 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin (a (func1 a k)) := sorry ``` I'm not sure what to call these functions. The analogues in the non-dependent case are `divNat` and `modNat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	92/16	Mathlib/Algebra/BigOperators/Fin.lean	1	14	['YaelDillies', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	425-37074 1 year ago	547-15002 547 days ago	3-28829 3 days
19227	adomani author:adomani	fix(CI): unwrap `lake test` in problem matcher	... and also add a `#guard_msgs` in `AssertImported` test, so that `lake test` properly fails. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/CI.3A.20noisy.20.22test.20mathlib.22/near/483126955) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	9/20	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,MathlibTest/AssertImported.lean	5	2	['bryangingechen', 'github-actions']	nobody	422-56110 1 year ago	523-10381 523 days ago	22-71271 22 days
15774	kkytola author:kkytola	feat: Topology on `ENat`	This PR may contain some results that are not in the PR that adds a toppology on `ENat`. --- The immediate motivation is to be able to make the right continuity statement of the extended floor function on `ENNReal`, when this floor function is made `ENat`valued as suggested in the PR review of #15269. The API here is modelled on the early parts of [the corresponding ENNReal file](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Instances/ENNReal.html#top), although much of this case is more trivial. - [x] depends on: #15380 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology t-order	161/9	Mathlib/Data/ENat/Basic.lean,Mathlib/Topology/Instances/ENat.lean	2	4	['YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	418-13642 1 year ago	643-43185 643 days ago	0-6819 1 hour
20222	eric-wieser author:eric-wieser	feat: generalize lemmas about derivatives	Rather than creating a huge diff by shuffling things around, this generalizes everything in-place and swaps between `section`s for topological and normed vector spaces. The rationale for this approach is that: * we may further generalize the results of this file, and this avoids us jumbling up the order multiple times unnecessarily. * this greatly reduces the chance of merge conflicts --- - [ ] depends on: #21065 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-analysis	554/50	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,MathlibTest/Recall.lean	3	8	['adomani', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	413-70310 1 year ago	476-83552 476 days ago	7-27718 7 days
21018	markimunro author:markimunro	feat(Data/Matrix): add file with key definitions and theorems about elementary row operations	Prove that each elementary row operation is equivalent to a multiplication by an elementary matrix, has another row operation which inverts it, and that each elementary matrix has a left inverse. This is a very large PR and I understand it will take time. This is my first one and will likely have issues but I will be ready to answer questions/fix them as soon as possible. Co-authored-by: Christopher Lynch --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data enhancement new-contributor merge-conflict awaiting-author	1230/0	Mathlib.lean,Mathlib/Data/Matrix/ElementaryRowOperations.lean,Mathlib/Data/Matrix/GaussianElimination.lean,Mathlib/Data/Matrix/GaussianEliminationOld,Mathlib/Data/Matrix/oldnames,et --hard 18533caba32,lean-toolchain	7	17	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	412-78377 1 year ago	438-20933 438 days ago	23-22681 23 days
23514	eric-wieser author:eric-wieser	refactor: smooth over Lattice/LinearOrder inheritance	This fixes the forgetful inheritance in `CompleteLinearOrder` and `ConditionallyCompleteLinearOrder`, which previously did not carry `compare` fields. (edit: moved to #23515) The following is the inheritance diagram before, where the dotted lines are manual instances. Note that every lattice typeclass that extends `LinearOrder` has to implement another dotted line edge, and remember to copy all the necessary data fields. ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> PartialOrder; Lattice --> PartialOrder; CompleteLinearOrder --> Lattice; ConditionallyCompleteLinearOrder --> Lattice; LinearOrder-.-> Lattice; CompleteLinearOrder -.-> LinearOrder; ConditionallyCompleteLinearOrder -.-> LinearOrder; ``` This change introduces two new auxiliary typeclasses, to encapsulate these troublesome edges. `LinearOrderedLattice` can be thought of as `LinearOrder`, but with `sup`/`inf` instead of `min`/`max`. This is crucial, because it ensures the duplicate fields are merged in `extends CompleteLattice X, LinearOrderedLattice X`, which would not be the case for `extends CompleteLattice X, LinearOrder X`. The result is: ```mermaid graph TD LinearOrder --> Min,Max; LinearOrder --> LinearOrderBase; LinearOrderBase --> PartialOrder; Lattice --> PartialOrder; LinearOrderedLattice -.-> LinearOrder; LinearOrderedLattice --> LinearOrderBase; LinearOrderedLattice --> Lattice; CompleteLinearOrder --> LinearOrderedLattice; ConditionallyCompleteLinearOrder --> LinearOrderedLattice; ``` --- - [ ] depends on: #23515 - [ ] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	85/66	Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Order/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Lattice.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	412-17807 1 year ago	413-22746 413 days ago	0-172 2 minutes
22810	pechersky author:pechersky	feat(Counterexamples): metric space not induced by norm	Because the distance is not homogeneous --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #22845	merge-conflict WIP t-topology t-analysis	202/1	Counterexamples.lean,Counterexamples/NotBoundedSMulMetricSpace.lean,Mathlib.lean,Mathlib/Analysis/Normed/PiNat.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/MetricSpace/Polish.lean	6	21	['eric-wieser', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	411-54269 1 year ago	427-1360 427 days ago	0-82394 22 hours
13124	FR-vdash-bot author:FR-vdash-bot	chore: remove `CovariantClass` and `ContravariantClass`	Lean cannot handle `CovariantClass` and `ContravariantClass` correctly - TC slowness - [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/TC.20slowness) - https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488 - It may also have made #6326 fail. - Needs a weird hack to find instance: #9252 --- - [x] depends on: #13154 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/486	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean	37	6	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	410-82246 1 year ago	unknown	0-0 0 seconds
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	t-measure-probability new-contributor merge-conflict awaiting-author t-analysis	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	407-73366 1 year ago	601-50737 601 days ago	51-85104 51 days
22888	plp127 author:plp127	perf: replace `Lean.Expr.swapBVars` with a better? implementation	Replaces `Lean.Expr.swapBVars` with a version that traverses the expression. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	14/12	Mathlib/Tactic/FunProp/ToBatteries.lean	1	23	['eric-wieser', 'github-actions', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127']	eric-wieser and joneugster assignee:eric-wieser assignee:joneugster	406-66411 1 year ago	427-29851 427 days ago	4-80306 4 days
22579	kvanvels author:kvanvels	doc(Topology/Defs/Induced): fix comments on three functions related to RestrictGenTopology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology documentation awaiting-author	10/9	Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/RestrictGen.lean	2	4	['github-actions', 'kvanvels', 'leanprover-community-bot-assistant', 'urkud']	nobody	404-80269 1 year ago	427-84646 427 days ago	12-18679 12 days
21488	imbrem author:imbrem	feat(CategoryTheory/Monoidal): premonoidal categories	Add support for premonoidal categories --- Still want to add support for: - Premonoidal braided/symmetric categories - The monoidal coherence theorem, which I've already ported in my `discretion` library - The `coherence` tactic, which should work fine for premonoidal categories too but wanted to get this in front of reviewers ASAP to make sure my general approach was alright [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory new-contributor	900/361	Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/End.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Localization/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean,Mathlib/CategoryTheory/Monoidal/End.lean,Mathlib/CategoryTheory/Monoidal/Free/Basic.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean,MathlibTest/StringDiagram.lean	21	9	['YaelDillies', 'github-actions', 'grunweg', 'imbrem', 'kim-em', 'leanprover-community-bot-assistant']	nobody	404-55554 1 year ago	404-55555 404 days ago	58-6026 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory large-import	338/24	Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Galois/Examples.lean	3	13	['b-mehta', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'sinhp']	nobody	404-55552 1 year ago	404-55554 404 days ago	36-69400 36 days
22319	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Sections Right Adjoint)	we define the `Over.sections` functor in the file `CategoryTheory.Comma.Over.Sections` and prove that it is a right adjoint to the `Over.star`, thereby solving an existing TODO in `Over.pullback` file. The `sections` functor is used to define the right adjoint to the pullback functor `Over.pullback` in the development of LCCCs. Moreover, the rest of added lemmas and theorems to `CategoryTheory.Comma.Over.Pullback` are crucial for the development of LCCCs in the next PR. --- - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	547/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-55025 1 year ago	446-59060 446 days ago	0-2084 34 minutes
22321	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Definition)	This PR defines locally cartesian closed categories in terms of existence of the pushforward functors (right adjoint to the pullback functor) for all morphisms. We develop basic API and prove the following: 1. Existence of the pushforward functors is equivalent to cartesian closed slices. 2. Any locally cartesian closed category with a terminal object is cartesian closed. 3. The slices of a locally cartesian closed category are locally cartesian closed. Some of the content is based on the project of formalization of polynomial functors at the Trimester "Prospect of Formal Mathematics" at the Hausdorff Institute (HIM) in Bonn. https://github.com/sinhp/Poly I found this implementation of locally cartesian closed categories amenable to polynomial functors formalization. Co-authored-by: Emily Riehl --- - [ ] depends on: #21525 - [ ] depends on: #22319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory large-import	812/24	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Sections.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	404-55025 1 year ago	446-57801 446 days ago	0-336 5 minutes
19425	hrmacbeth author:hrmacbeth	perf: gcongr forward-reasoning adjustment	This PR changes the "forward-reasoning" component of `gcongr`, rendering it more efficient, particularly in problems with a large number of variables/hypotheses in the context. Previously `gcongr` attempted to match every `LocalDecl` against every node in the parse tree using each of the five implemented `@[gcongr_forward]` mini-tactics: matching directly, matching after applying `symm`, matching after applying `le_of_lt`, etc etc. The new algorithm filters out the non-Prop `LocalDecl`s, and also adjusts the `@[gcongr_forward]` extensions so that, rather than re-apply the relevant lemmas (`symm`, `le_of_lt`, etc) at every node in the parse tree, the lemmas are applied in advance to the `LocalDecl`s and the result (if successful) stored. The performance effect on mathlib as a whole is miniscule, but it speeds up the profiler's count of "tactic execution of Mathlib.Tactic.GCongr" in the newly-added test from 257 ms to 47 ms, and has a similar effect on real-life examples in an analysis project of mine. Co-authored-by: Mario Carneiro --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) (Note that Mario provided the ideas but not the code, so please review with appropriate diligence!)	merge-conflict awaiting-author	130/59	Mathlib/Order/Lattice.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GCongr/ForwardAttr.lean,MathlibTest/GCongr/inequalities.lean	4	17	['Vierkantor', 'github-actions', 'hrmacbeth', 'leanprover-bot', 'leanprover-community-bot-assistant']	Vierkantor assignee:Vierkantor	403-68086 1 year ago	536-56503 536 days ago	1-41769 1 day
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology new-contributor	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	403-58282 1 year ago	478-51042 478 days ago	5-5648 5 days
22817	peabrainiac author:peabrainiac	feat(CategoryTheory/Sites): local sites	Defines local sites and shows that sheaves of types on them form a local topos, in that the global sections functor `Sheaf.Γ` has a right adjoint `Sheaf.codisc` that is fully faithful. --- - [x] depends on: #22816 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	263/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/Types.lean,Mathlib/CategoryTheory/Sites/GlobalSections.lean,Mathlib/CategoryTheory/Sites/LocalSite.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean	6	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	402-78291 1 year ago	433-79790 433 days ago	0-568 9 minutes
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	247/287	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Computability/Reduce.lean,Mathlib/Computability/Tape.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Multiset/ZeroCons.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/Complement.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Category/PartOrd.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/Topology/Algebra/Group/TopologicalAbelianization.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Separation/Basic.lean	65	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	398-80518 1 year ago	398-80520 398 days ago	55-52030 55 days
23509	eric-wieser author:eric-wieser	refactor: Make ENNReal an abbrev	The `Coe` instance becomes `CoeTC` to match what we do for `WithTop` (such that the priority kicks in) Probably we could have both copies and things would be ok. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This includes part of #23750	merge-conflict t-data	22/66	Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/BigOperators.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean,Mathlib/Topology/MetricSpace/PartitionOfUnity.lean	7	22	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mattrobball', 'urkud']	nobody	398-64171 1 year ago	400-48899 400 days ago	5-23475 5 days
11455	adomani author:adomani	fix: unsqueeze simp, re Yaël's comments on #11259	This PR reverts/simplifies some of the "squeeze `simp`" changes in #11259. See #11259 for context. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	3/6	Mathlib/Algebra/Group/Conj.lean,Mathlib/Data/Seq/WSeq.lean	2	8	['Ruben-VandeVelde', 'YaelDillies', 'grunweg', 'loefflerd', 'robertylewis', 'urkud']	nobody	398-25771 1 year ago	696-55678 696 days ago	93-60645 93 days
7325	eric-wieser author:eric-wieser	chore: use preimageIso instead of defeq abuse for InducedCategory	This makes a few things slightly more verbose, but the type casts are now explicit in those places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory awaiting-CI	22/21	Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean	3	1	['grunweg']	nobody	398-25650 1 year ago	unknown	0-0 0 seconds
7874	astrainfinita author:astrainfinita	chore: make `IsScalarTower A A B` and `IsScalarTower A B B` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra awaiting-CI label:t-algebra$	10/9	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/GroupTheory/GroupAction/Ring.lean	4	3	['astrainfinita', 'grunweg', 'leanprover-bot']	nobody	398-25625 1 year ago	unknown	0-0 0 seconds
13038	adomani author:adomani	feat: Mathlib weekly reports	This PR introduces a weekly cron job that computes a "global" report on the evolution of Mathlib in the previous week. It consists of * a CI workflow with a cron job that runs at minight on Sunday (`.github/workflows/mathlib_stats.yaml`); * a Lean file extracting a categorized list of "all" the declarations in Mathlib (`scripts/count_decls.lean`); * a bash file computing Git-diff-related information and collating the data from the Lean file (`scripts/mathlib_stats.sh`); * a convenience CI workflow that is triggered on adding the `test-ci` label and results in posting on the PR and on Zulip the report (`.github/workflows/mathlib_stats_label.yaml`). The second CI workflow is intended to be removed just before/right after the PR is ready to merge. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general) [Thread for the reports](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Mathlib.20weekly.20change.20report) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI t-meta	338/0	.github/workflows/mathlib_stats.yaml,.github/workflows/mathlib_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	10	['adomani', 'github-actions', 'grunweg', 'kim-em', 'kmill']	nobody	398-25583 1 year ago	672-43463 672 days ago	57-4374 57 days
5952	eric-wieser author:eric-wieser	feat: add Qq wrappers for ToExpr	--- - [ ] depends on: #6699 (to appease the linter) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI t-meta	247/150	Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Tactic/DeriveToExpr.lean,Mathlib/Tactic/FBinop.lean,Mathlib/Tactic/ToExpr.lean,Mathlib/Util/Qq.lean,test/DeriveToExpr.lean,test/vec_notation.lean	9	7	['eric-wieser', 'gebner', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	398-25451 1 year ago	1004-68714 1004 days ago	29-67421 29 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	114/60	Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/MeasureTheory/Measure/Haar/Quotient.lean,Mathlib/Topology/Algebra/Group/Compact.lean	6	14	['astrainfinita', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	398-25411 1 year ago	646-63741 646 days ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	240/92	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated/Basic.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/Util/NoInstances.lean,scripts/noshake.json	50	8	['astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	398-25187 1 year ago	602-64734 602 days ago	14-58900 14 days
19467	quangvdao author:quangvdao	feat(MvPolynomial/Equiv): Add `MvPolynomial.finSuccEquivNth`	This PR adds `MvPolynomial.finSuccEquivNth`, which is the algebra isomorphism between `MvPolynomial (Fin (n + 1)) R` and `Polynomial (MvPolynomial (Fin n) R)` by identifying the `p`-th variable as the indeterminate. This generalizes `MvPolynomial.finSuccEquiv` which is only for the `0`-th variable. The supporting theorems for the `Nth` version are identical to the current version, with the `Nth` version deduced from the former. These changes require new definitions in `Finsupp/Fin`, which is a separate PR. Co-authored-by: Yaël Dillies --- - [ ] depends on: #19315 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	541/163	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Fin.lean,scripts/nolints_prime_decls.txt	7	9	['acmepjz', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	396-29527 1 year ago	539-49493 539 days ago	0-790 13 minutes
20313	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Data/Complex/Exponential): prove some useful results about the complex exponential.	This PR proves two basic results about the complex exponential: * `abs_exp_mul_I (x : ℂ) : abs (Complex.exp (I * x)) = Real.exp (-x.im)` * `one_sub_rexp_re_le_abs_one_sub_cexp (x : ℂ) : 1 - Real.exp x.re ≤ Complex.abs (1 - Complex.exp x)` Both results were proved as part of the sphere packing project. There's a chance they're too specific for mathlib, but I thought they were worth PRing anyway. Would it also be a good idea to tag `abs_exp_mul_I` with `simp`? Feedback/suggestions welcome. Note: `one_sub_rexp_re_le_abs_one_sub_cexp` was proved by Bhavik Mehta @b-mehta --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-analysis new-contributor	167/141	Mathlib.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/ERealExp.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev.lean,Mathlib/Data/Complex/Exponential/Defs.lean,Mathlib/Data/Complex/Exponential/Lemmas.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Tactic/FunProp.lean,MathlibTest/Recall.lean,MathlibTest/positivity.lean	10	12	['b-mehta', 'github-actions', 'kim-em', 'thefundamentaltheor3m', 'trivial1711']	nobody	396-29480 1 year ago	479-40727 479 days ago	8-42257 8 days
22698	Kiolt author:Kiolt	feat: notation for whisker(Left/Right)Iso	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory toric	175/113	Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Bicategory/Extension.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean,Mathlib/CategoryTheory/Bicategory/SingleObj.lean,Mathlib/CategoryTheory/Closed/Functor.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/GradedObject/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Center.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Monoidal/Transport.lean,Mathlib/Tactic/CategoryTheory/BicategoricalComp.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Bicategory/Normalize.lean,Mathlib/Tactic/CategoryTheory/Bicategory/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Datatypes.lean,Mathlib/Tactic/CategoryTheory/Monoidal/Normalize.lean,Mathlib/Tactic/CategoryTheory/Monoidal/PureCoherence.lean,Mathlib/Tactic/CategoryTheory/MonoidalComp.lean	27	21	['Kiolt', 'YaelDillies', 'b-mehta', 'github-actions', 'leanprover-bot']	nobody	396-29309 1 year ago	432-48666 432 days ago	3-29299 3 days
20730	kuotsanhsu author:kuotsanhsu	feat(LinearAlgebra/Matrix/SchurTriangulation): prove Schur decomposition/triangulation	`Matrix.schur_triangulation` shows that a matrix over an algebraically closed field is unitarily similar to an upper triangular matrix --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	317/2	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean,Mathlib/Logic/Equiv/Basic.lean	4	14	['eric-wieser', 'github-actions', 'kim-em', 'kuotsanhsu']	nobody	396-25612 1 year ago	476-16585 476 days ago	13-56244 13 days
19117	eric-wieser author:eric-wieser	feat: derivatives of matrix operations	These are finally possible to state after #19108. However, a lot of bundled `ContinuousLinearMap`s are missing. --- - [x] depends on: #19108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	336/22	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Matrix.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	394-47990 1 year ago	unknown	0-0 0 seconds
12605	FR-vdash-bot author:FR-vdash-bot	chore: attribute [induction_eliminator]	Add attribute [induction_eliminator] to `AdjoinRoot.induction_on` `ENat.recTopCoe` `ENNReal.recTopCoe` `Finset.induction` `Magma.AssocQuotient.induction_on` `ManyOneDegree.ind_on` `Module.Ray.ind` (and add `Orientation.ind` for `Orientation`, an abbrev of it. I wish that we do not need to add it in the future.) `Multiset.induction` `MvPolynomial.induction_on` `OnePoint.rec` `Opposite.rec'` `Ordinal.limitRecOn` `PartENat.casesOn` `Polynomial.induction_on'` `QuotientAddGroup.induction_on'` (and add `AddCircle.induction_on` for `AddCircle`, an abbrev of it. I wish that we do not need to add it in the future.) `QuotientGroup.induction_on'` (doesn't actually work) `Real.Angle.induction_on` `SimplexCategory.rec` `Trunc.induction_on` --- - [x] depends on: #13476 - [x] depends on: #13264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	354/342	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/BigOperators/Group/Multiset.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval.lean,Mathlib/Algebra/Polynomial/Induction.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolynomialExp.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Compression/Down.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Fold.lean,Mathlib/Data/Multiset/Lattice.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Powerset.lean,Mathlib/Data/Multiset/Sections.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Pointwise/BigOperators.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Logic/Hydra.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Measure/AddContent.lean	140	14	['YaelDillies', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	394-42605 1 year ago	726-74176 726 days ago	4-46495 4 days
23859	urkud author:urkud	feat(Topology/../Order/Field): generalize to `Semifield`	.. from a linear ordered field to a linear ordered semifield--- - [ ] depends on: #23857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	245/219	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Order/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	391-68428 1 year ago	404-79069 404 days ago	0-265 4 minutes
24219	Paul-Lez author:Paul-Lez	feat: linear independence of the tensor product of two linearly independent families	This is still WIP (the proofs are a little too long, and some lemmas need to be moved to other files!) From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra toric label:t-algebra$	193/0	Mathlib/LinearAlgebra/LinearIndependent/Tprod.lean	1	1	['github-actions']	nobody	391-47860 1 year ago	393-62761 393 days ago	0-2221 37 minutes
23810	b-reinke author:b-reinke	chore(Order/Interval): generalize succ/pred lemmas to partial orders	Many lemmas in `Mathlib/Order/Interval/Set/SuccPred.lean`and `Mathlib/Order/Interval/Finset/SuccPred.lean` also work for partial orders. They are generalized in this PR by introducing different sections for `PartialOrder` and `LinearOrder` assumptions in the respective files. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	389-45203 1 year ago	389-45205 389 days ago	16-29623 16 days
24285	madvorak author:madvorak	chore(Algebra/*-{Category,Homology}): remove unnecessary universe variables	Discussions: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/with/513620128 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Algebra.20and.20.60Type.60/with/513558902 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible/with/513592993 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	542/916	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Field.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/Central/Defs.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Quotient.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Finite.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Invertible/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/TypeTags/Finite.lean,Mathlib/Algebra/Group/TypeTags/Hom.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pi.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/NeZero.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/CartanMatrix.lean,Mathlib/Algebra/Lie/CartanSubalgebra.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Lie/UniversalEnveloping.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/Module/Equiv/Opposite.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/MinimalAxioms.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Opposite.lean,Mathlib/Algebra/Module/Pi.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean	182	22	['erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'madvorak', 'mattrobball']	nobody	389-33900 1 year ago	389-33901 389 days ago	2-11655 2 days
22583	imathwy author:imathwy	feat: affinespace homeomorphism	There exists a homeomorphism (a continuous bijection with a continuous inverse) between an affine subspace s of a vector space V over a field 𝕜 and its direction s.direction , given a chosen point z ∈ s . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	64/2	Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/MulAction.lean	4	6	['JovanGerb', 'eric-wieser', 'github-actions', 'grunweg']	nobody	387-44075 1 year ago	439-56096 439 days ago	0-18122 5 hours
23593	erdOne author:erdOne	feat(AlgebraicGeometry): the tilde construction is functorial	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	4	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant']	nobody	385-61271 1 year ago	410-64285 410 days ago	0-71091 19 hours
21065	eric-wieser author:eric-wieser	feat: generalize `tangentConeAt.lim_zero` to TVS	... and then adjust the `variable`s down the rest of the file to make use of the generality. There are two key lemmas that this does not generalize, which would probably unlock the rest of the file: * `subset_tangentCone_prod_left` (and `_right`) * `zero_mem_tangentCone` --- - [ ] depends on: #20859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	55/28	Mathlib/Analysis/Calculus/TangentCone.lean	1	16	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	385-53675 1 year ago	453-3350 453 days ago	23-20072 23 days
22721	grunweg author:grunweg	chore(MeasureTheory/Function/LpSeminorm/Basic): generalise more results to enorm classes	Done for the Carleson project. --- - depends on #22708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-measure-probability	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	384-46343 1 year ago	436-32709 436 days ago	0-6 6 seconds
14731	adomani author:adomani	feat: the repeated typeclass assumption linter	[#mathlib4 > recyclable variables @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/recyclable.20variables/near/451167963) also [#mathlib4 > Normed modules @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Normed.20modules/near/512242167) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter large-import	178/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/DependentTypeclass.lean,MathlibTest/DependentTypeclass.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	383-51582 1 year ago	673-50327 673 days ago	0-109 1 minute
24549	grunweg author:grunweg	feat: define embedded submanifolds, attempt 1	Not meant to be merged (I think a different design is better); opening this so I can find this more easily. --- - [ ] depends on: #23040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	1445/2	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/EmbeddedSubmanifold.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/LinearAlgebra/Prod.lean	8	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	380-76795 1 year ago	381-59718 381 days ago	0-1 1 second
22809	b-reinke author:b-reinke	feat: Category algebras and path algebras	This PR defines the category algebra of a linear category and path algebras of quivers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory new-contributor label:t-algebra$	218/0	Mathlib/Algebra/Ring/Assoc.lean,Mathlib/CategoryTheory/Linear/CategoryAlgebra.lean,Mathlib/Combinatorics/Quiver/PathAlgebra.lean,Mathlib/Data/DFinsupp/BigOperators.lean	4	2	['b-reinke', 'github-actions']	nobody	380-76451 1 year ago	unknown	0-0 0 seconds
14675	adomani author:adomani	dev: the repeated variable linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-linter	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	380-76128 1 year ago	675-62682 675 days ago	0-8 8 seconds
14330	Ruben-VandeVelde author:Ruben-VandeVelde	chore: split Mathlib.Algebra.Star.Basic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	446/331	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Star.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Defs.lean,Mathlib/Algebra/Star/Lemmas.lean,Mathlib/Algebra/Star/Order.lean,Mathlib/Algebra/Star/Pi.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Rat.lean,Mathlib/Algebra/Star/Regular.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Data/Complex/Basic.lean,scripts/noshake.json	15	3	['github-actions', 'grunweg', 'j-loreaux']	nobody	380-76088 1 year ago	686-6033 686 days ago	0-45204 12 hours
8511	eric-wieser author:eric-wieser	refactor(MeasureTheory/Measure/Haar/Basic): partially generalize to the affine case	Without a `Mul` version of `AddTorsor`, this generalization can only go so far. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	380-75719 1 year ago	911-47399 911 days ago	0-7 7 seconds
7994	ericrbg author:ericrbg	chore: generalize `LieSubalgebra.mem_map_submodule`	--- Not sure if we should rename to something like `mem_map_iff_mem_map_submodule` or not. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-algebra label:t-algebra$	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	380-75707 1 year ago	933-70702 933 days ago	0-1 1 second
6317	eric-wieser author:eric-wieser	refactor(Data/Finsupp/Defs): make Finsupp.single defeq to Pi.single	By adding a `DecidableEq ι` argument to `Finsupp.single`, we remove the reference to `Classical.decEq ι` in the definition, which in turn means that when coerced to a function it is now defeq to `Pi.single`. This also brings it in line with `DFinsupp.single`. This does not go as far as making `Finsupp.single` computable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	269/226	Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/Finsupp.lean	12	0	[]	nobody	380-75701 1 year ago	unknown	0-0 0 seconds
11524	mcdoll author:mcdoll	refactor: Introduce type-class for SchwartzMap	--- There are a lot of other refactors to do (`seminormAux` should have a nicer name and gobble up more theorems from `seminorm`), then one can prove `integrable` and friends with only `SchwartzMapClass`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	380-75615 1 year ago	unknown	0-0 0 seconds
11003	thorimur author:thorimur	chore: migrate to `tfae` block tactic	Migrates to the `tfae` block tactic syntax, eliminating uses of `tfae_have` and `tfae_finish`. --- - [ ] depends on: #11000 - [ ] depends on: #10991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR t-meta	1267/1081	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/NormedSpace.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/Abelian/Exact.lean,Mathlib/CategoryTheory/Bicategory/Kan/Adjunction.lean,Mathlib/FieldTheory/Galois.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/Order/Height.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Tactic/TFAE.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Category/CompHaus/EffectiveEpi.lean,Mathlib/Topology/Category/Profinite/EffectiveEpi.lean,Mathlib/Topology/Category/Stonean/EffectiveEpi.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyClosed.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/NoetherianSpace.lean,Mathlib/Topology/Order/LeftRightNhds.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,scripts/noshake.json,test/tfae.lean	42	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	380-75611 1 year ago	609-36984 609 days ago	3-60883 3 days
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-topology FLT	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	10	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	379-59266 1 year ago	386-1418 386 days ago	55-70108 55 days
15654	TpmKranz author:TpmKranz	feat(Computability): language-preserving maps between NFA and RE	Map REs to NFAs via Thompson's construction and NFAs to REs using GNFAs Last chunk of #12648 --- - [ ] depends on: #15651 - [ ] depends on: #15649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-computability merge-conflict awaiting-zulip	985/2	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Data/FinEnum/Option.lean,docs/references.bib	7	3	['github-actions', 'leanprover-community-mathlib4-bot', 'meithecatte']	nobody	378-22731 1 year ago	647-45916 647 days ago	0-179 2 minutes
19315	quangvdao author:quangvdao	feat(Data/Finsupp/Fin): Add `Finsupp` operations on `Fin` tuple	This PR adds more analogues of operations on `Fin` tuples to the `Finsupp` setting. Before, there were only `Finsupp.cons` and `Finsupp.tail`. Now there are also `Finsupp.snoc`, `Finsupp.insertNth`, `Finsupp.init`, and `Finsupp.removeNth`. These all come with supporting lemmas. I also removed the porting comment about `succAboveCases` in `Data/Fin/Basic`, and added a lemma about `succAbove` in `Data/Fin/Tuple/Basic`. --- - [x] depends on: #20361 - [x] depends on: #20771 - [x] depends on: #20770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	193/16	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,scripts/nolints_prime_decls.txt	6	44	['YaelDillies', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'quangvdao']	nobody	377-24692 1 year ago	454-49715 454 days ago	43-80684 43 days
24155	eric-wieser author:eric-wieser	feat: add a "rw_proc" for fin vectors	This seems a little nicer than an elaborator, since it means I can use the default elaboration rules to handle my first few variables. Ideally there would be something like ```lean rw_procQ {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A : Q(Type u) B : Q($A -> Type v) a : Q($A) b : Q($B $a) rhs : Q($B $a) -- metavariable to assign \|- MetaM Q($b = ?rhs) -/ ``` or ```lean rw_proc {A : Type u} {B : A -> Type v} (a : A) (b : B a) : b = ?rhs => do /-- Context: u v : Level A B a b : Expr rhs : MVarId \|- MetaM Expr -/ ``` which would generate the code I wrote here --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author RFC t-data t-meta	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	2	['github-actions', 'urkud']	nobody	375-20572 1 year ago	375-20572 375 days ago	20-83091 20 days
21276	GabinKolly author:GabinKolly	feat(ModelTheory/Substructures): define equivalences between equal substructures	Define first-order equivalences between equal substructures, and prove related properties. --- This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-logic	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	374-42766 1 year ago	374-42766 374 days ago	46-55730 46 days
24008	meithecatte author:meithecatte	chore(EpsilonNFA): replace manual lemmas with @[simps]	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-author new-contributor	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	372-68310 1 year ago	372-68310 372 days ago	27-52316 27 days
24642	grunweg author:grunweg	WIP-feat: add layercake formula for ENNReal-valued functions	Not much to see here yet; some significant amount of work remains. --- - [ ] depends on: #24643 - [ ] depends on: #24640 (based on that PR for simplicity) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-analysis	189/24	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Integral/Layercake.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	371-44691 1 year ago	unknown	0-0 0 seconds
21712	grunweg author:grunweg	chore: generalise more lemmas to `ContinuousENorm`	--- - [x] depends on: #21781 (minor drive-by clean-up) - [x] depends on: #21670 - [x] depends on: #22708 (extracted from this) - some parts depend on #21433 (or better: #22175); when the dependent PR has landed, I will re-assess whether to split these into a separate PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict carleson awaiting-CI t-measure-probability	76/31	Mathlib/Analysis/Normed/MulAction.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/ContinuousFunctions.lean	4	5	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	370-66375 1 year ago	unknown	0-0 0 seconds
21375	grunweg author:grunweg	WIP: generalise lemmas to ENorm	This work is part of (and a necessary pre-requisite for) the Carleson project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI t-measure-probability carleson merge-conflict	471/221	Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Function/LpOrder.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/ChebyshevMarkov.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Trim.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/Probability/Independence/Integrable.lean	13	2	['fpvandoorn', 'grunweg']	nobody	370-60750 1 year ago	unknown	0-0 0 seconds
24618	b-mehta author:b-mehta	feat(Analysis): add Schur inequality and variants	Add Schur inequality and some of its common variants. TODO: - [x] add reference to source: https://www.cip.ifi.lmu.de/~grinberg/VornicuS.pdf - [ ] add other generalisations - [ ] move some of the lemmas elsewhere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	145/0	Mathlib/Analysis/Convex/Schur.lean	1	16	['b-mehta', 'eric-wieser', 'github-actions']	nobody	369-55843 1 year ago	378-35845 378 days ago	0-2 2 seconds
15115	kkytola author:kkytola	feat: Generalize assumptions in liminf and limsup results in ENNReals	In a [review comment](https://github.com/leanprover-community/mathlib4/pull/13938#discussion_r1649744441) it was pointed out that results about liminf and limsup in ENNReal hold under milder assumptions. This PR does the generalization. --- This PR is split off from #13938, where the review comment was made. The changes needed for the suggested generalization were of different kind than the simple PR's content, justifying a separate PR. - [x] depends on: #13938 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict help-wanted awaiting-author t-topology	215/27	Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean	3	8	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot']	nobody	368-57085 1 year ago	614-49903 614 days ago	21-25493 21 days
24957	eric-wieser author:eric-wieser	feat: use ` binderNameHint` in sum_congr	Zulip thread: [#new members > Choosing dummy variable inside summation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Choosing.20dummy.20variable.20inside.20summation/near/518492888) Co-authored-by: Joachim Breitner --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	23/16	Mathlib/Algebra/BigOperators/Expect.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/Multiset/Count.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Multiset/MapFold.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Sym/Basic.lean,Mathlib/Data/Sym/Sym2.lean	13	2	['github-actions', 'mathlib-merge-conflicts']	nobody	367-54987 1 year ago	367-56089 367 days ago	0-424 7 minutes
23349	BGuillemet author:BGuillemet	feat: add LocallyLipschitzOn.lipschitzOnWith_of_isCompact and two small lemmas about Lipschitz functions	Main feat (in Mathlib/Topology/EMetricSpace/Basic.lean): if a function `f` from an extended pseudometric space to a pseudometric space is locally Lipschitz on a compact subset `s`, then `f` is Lipschitz on `s`. The theorem is true only when the codomain of `f` is a pseudometric space, so it needs imports from Mathlib/Topology/MetricSpace. Other small feat (in Mathlib/Analysis/Calculus/ContDiff/RCLike.lean): a function that is continuously differentiable on an open subset is locally Lipschitz on this subset. --- - [ ] depends on: #22890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import new-contributor	59/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	PatrickMassot assignee:PatrickMassot	356-40651 11 months ago	356-40653 356 days ago	35-30364 35 days
12438	jjaassoonn author:jjaassoonn	feat: some APIs for flat modules	Need horseshoe lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	1674/3	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Exact.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Horseshoe.lean,Mathlib/CategoryTheory/Abelian/LeftDerived.lean,Mathlib/RingTheory/Flat/Basic.lean	8	21	['erdOne', 'github-actions', 'jjaassoonn', 'joelriou']	nobody	351-53277 11 months ago	753-16148 753 days ago	0-20 20 seconds
25473	adomani author:adomani	feat(CI): check that Mathlib files have lean or md extension	Twice recently there have been files with an "intended" `.lean` extension in `Mathlib/`: * #24942, ending in `;lean`; * #25457, ending in `.Lean`. `mk_all` does not add these files to `Mathlib.lean`, since they do not end in `.lean` and this later causes problems. This CI step checks that all files in `Mathlib/` end with `.lean` or `.md`. See #25474 for a test where the new step [correctly fails](https://github.com/leanprover-community/mathlib4/actions/runs/15464097783/job/43532018379?pr=25474). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI delegated	10/0	.github/workflows/lint_and_suggest_pr.yml	1	10	['adomani', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	347-57218 11 months ago	347-58109 347 days ago	0-10326 2 hours
16020	adomani author:adomani	feat: compare PR `olean`s size with `master`	Adds two CI steps: * `print the sizes of the oleans` that prints the sizes of all the folders containing `Mathlib` `.olean`s; * `compare oleans` that compares the sizes of the previous step with the corresponding sizes on `master`. In the test runs, the two steps have taken at most 3 seconds combined (the first is virtually instantaneous, the second one depends on `curl` to find a job id and on `gh` to retrieve the logs of a previous CI run -- everything else appears to be negligible). This hopefully helps finding out if some PR is bloating up the `.olean`s. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Error.3A.20No.20space.20left.20on.20device/near/463792355) for a PR of mine that prompted this check. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict CI	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	50	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	347-4258 11 months ago	544-51680 544 days ago	87-65841 87 days
16062	adomani author:adomani	Test/ci olean size	Tests for oleans --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author CI	114/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	4	['Parcly-Taxel', 'adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	347-4258 11 months ago	634-65238 634 days ago	0-16 16 seconds
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-algebra new-contributor merge-conflict awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	346-12604 11 months ago	729-40257 729 days ago	9-22045 9 days
23709	plp127 author:plp127	feat: `Nat.findFrom`	This PR adds `Nat.findFrom`, which is like `Nat.find`, but starting from an arbitrary `k` instead of `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	190/47	Mathlib/Data/Nat/Find.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	345-64293 11 months ago	408-30066 408 days ago	0-943 15 minutes
25340	dupuisf author:dupuisf	chore(Analysis/Convex): move files pertaining to convex/concave functions to their own folder	This PR creates a new folder under `Analysis/Convex` called `Analysis/Convex/Function`, which includes files that are mostly or entirely about convex/concave functions (as opposed to convex sets). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-convex-geometry	4264/4155	Mathlib.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Function/Basic.lean,Mathlib/Analysis/Convex/Function/Continuous.lean,Mathlib/Analysis/Convex/Function/Deriv.lean,Mathlib/Analysis/Convex/Function/Extrema.lean,Mathlib/Analysis/Convex/Function/Integral.lean,Mathlib/Analysis/Convex/Function/Jensen.lean,Mathlib/Analysis/Convex/Function/Mul.lean,Mathlib/Analysis/Convex/Function/Piecewise.lean,Mathlib/Analysis/Convex/Function/Quasiconvex.lean,Mathlib/Analysis/Convex/Function/Slope.lean,Mathlib/Analysis/Convex/Function/Strong.lean,Mathlib/Analysis/Convex/Integral.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Piecewise.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/SpecificFunctions/Basic.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/Strong.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean	34	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	345-63478 11 months ago	345-63480 345 days ago	6-38644 6 days
21734	adomani author:adomani	fix(PR summary): checkout GITHUB_SHA	This should make the version of the script that is used on PRs more stable. Suggested by Eric Wieser on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/messageFile.2Emd/near/498941855). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author CI	2/1	.github/workflows/PR_summary.yml	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	344-80145 11 months ago	461-30024 461 days ago	0-6023 1 hour
20334	miguelmarco author:miguelmarco	feat: allow polyrith to use a local Singular/Sage install	Try to call a local install of Singular (either standalone or inside Sage) to find the witness for polyrith before trying to call the online sage cell server. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-meta	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	339-5157 11 months ago	477-43138 477 days ago	27-61498 27 days
23953	b-reinke author:b-reinke	feat(Data/Matroid/Tutte): define the Tutte polynomial of a matroid	This PR defines the Tutte polynomial of a matroid and shows basic properties. - [x] depends on: #23926 - [ ] depends on #24336 - [ ] depends on: #23951 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	111/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Matroid/Tutte/Basic.lean,Mathlib/Data/Set/Image.lean	3	7	['apnelson1', 'b-reinke', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	336-46637 11 months ago	unknown	0-0 0 seconds
18771	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): exterior powers of free modules are free	Co-authored-by: sophie.morel@ens-lyon.fr --- - [ ] depends on: #18662 - [x] depends on: #18534 - [x] depends on: #18651 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	1185/160	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basis.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/ExteriorPower/Pairing.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower/Basic.lean,Mathlib/LinearAlgebra/TensorPower/Pairing.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	19	3	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-69774 10 months ago	unknown	0-0 0 seconds
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	847/159	Mathlib.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/AdicTopology.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	3	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55219 10 months ago	565-53118 565 days ago	0-679 11 minutes
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	699/21	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55217 10 months ago	565-54761 565 days ago	0-619 10 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [x] depends on: #18437 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology t-algebra label:t-algebra$	771/168	Mathlib.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/FilterBasisNew.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Algebra/Nonarchimedean/BasesNew.lean	6	5	['ADedecker', 'AntoineChambert-Loir', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	333-55216 10 months ago	565-55403 565 days ago	0-638 10 minutes
13964	pechersky author:pechersky	feat(Data/DigitExpansion): begin defining variant of reals without rationals	Based on a de Bruijn 1976 paper. This file is just the basic definition of a digit expansion. Will be followed up with further constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	330-37507 10 months ago	568-63723 568 days ago	129-57999 129 days
18662	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): generators of the exterior powers	--- - [x] depends on: #18534 - [x] depends on: #18590 - [ ] depends on: #26464 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	818/158	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	325-76229 10 months ago	unknown	0-0 0 seconds
18735	joelriou author:joelriou	feat(Algebra/Module): presentation of the exterior power	Given a presentation of a `R`-module `M`, we obtain a presentation of `⋀[R]^n M`. --- (Still one sorry left.) - [ ] depends on: #18527 - [ ] depends on: #18432 - [ ] depends on: #26464 - [ ] depends on: #18534 - [ ] depends on: #18662 - [x] depends on: #18590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra blocked-by-other-PR label:t-algebra$	1856/157	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	325-72203 10 months ago	unknown	0-0 0 seconds
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) I no longer plan to merge this PR, but I'm going to cherry-pick some changes to a new PR before closing this one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-zulip label:t-algebra$	82/72	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Units.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/GroupTheory/Submonoid/Inverses.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Contraction.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean,Mathlib/LinearAlgebra/CliffordAlgebra/SpinGroup.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/NumberTheory/MulChar/Basic.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	26	12	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud']	nobody	318-3080 10 months ago	589-37123 589 days ago	0-66650 18 hours
22928	javra author:javra	feat(CategoryTheory): infrastructure for inclusion morphisms into products in categories with 0-morphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	52/14	Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	318-2574 10 months ago	318-2575 318 days ago	112-51866 112 days
24710	chrisflav author:chrisflav	chore(Data/Set): `tsum` version of `Set.encard_iUnion_of_finite` for non-finite types	As requested here: https://github.com/leanprover-community/mathlib4/pull/23849#discussion_r2081070200 --- - [ ] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	163/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Card/InfiniteArithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Instances/ENat/Lemmas.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	318-2168 10 months ago	318-2168 318 days ago	1-80465 1 day
24823	eric-wieser author:eric-wieser	refactor: add `hom` lemmas for the `MonoidalCategory` structure on `ModuleCat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	148/164	Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Symmetric.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Rep.lean	11	21	['101damnations', 'YaelDillies', 'eric-wieser', 'github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant']	101damnations assignee:101damnations	318-2167 10 months ago	318-2167 318 days ago	37-56728 37 days
25071	erdOne author:erdOne	feat(EllipticCurve): basic API for singular cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry	320/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	3	35	['Multramate', 'acmepjz', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant']	nobody	318-1921 10 months ago	318-1922 318 days ago	45-4165 45 days
25218	kckennylau author:kckennylau	feat(AlgebraicGeometry): Tate normal form of elliptic curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry awaiting-zulip new-contributor	291/26	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Modular/TateNormalForm.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	5	31	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'github-actions', 'grunweg', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	318-1918 10 months ago	350-63435 350 days ago	6-47693 6 days
25561	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	179/25	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Grpd.lean	6	6	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	318-1903 10 months ago	334-39626 334 days ago	10-55201 10 days
20784	eric-wieser author:eric-wieser	fix: prevent `exact?` recursing forever on `n = 55`	Test case thanks to @llllvvuu: ```lean import Mathlib.SetTheory.Ordinal.Basic theorem natCast_inj {m n : ℕ} : (m : Ordinal) = n ↔ m = n := sorry example (n : Nat) : n = 55 := by exact? ``` This is surely a workaround for some unreported lean bug. The bug still exists for `n = 71` or higher, so we can still track down the bug after merging this patch. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	22/3	Mathlib/SetTheory/Ordinal/Basic.lean,MathlibTest/LibrarySearchRecDepth.lean	2	15	['Command-Master', 'eric-wieser', 'github-actions', 'kbuzzard', 'kim-em', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	317-57003 10 months ago	455-29365 455 days ago	32-73698 32 days
26647	b-mehta author:b-mehta	feat(Data/Sym/Sym2): lift commutative operations to sym2	While we have `Sym2.lift`, it's often useful to lift operations which are known to be commutative to the typeclass system. Indeed, the existing `Sym2.mul` witnesses this already. Thus, this PR can also be seen as generalising `Sym2.mul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-data	48/28	Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/Sym/Sym2/Finsupp.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	4	12	['b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	316-5199 10 months ago	316-24436 316 days ago	3-71897 3 days
25611	erdOne author:erdOne	chore(RingTheory): add `Algebra (FractionRing R) (FractionRing S)`	Co-authored-by: Yakov Pechersky --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	152/108	Mathlib.lean,Mathlib/Algebra/Algebra/NonZeroDivisors.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/FractionRingAlgebra.lean,Mathlib/RingTheory/Localization/Integral.lean	10	20	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky']	nobody	307-58205 10 months ago	341-53891 341 days ago	2-26945 2 days
18230	digama0 author:digama0	feat(Tactic/ScopedNS): extend `scoped[NS]` to more commands	refactor `ScopedNS` to remove error prone repetitiveness and extend it to other commands such as `syntax`, `macro`, `elab`, etc. Co-authored-by: Jon Eugster --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	201/26	Mathlib/Tactic/ScopedNS.lean,MathlibTest/scopedNS.lean	2	7	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'kbuzzard']	nobody	305-64666 10 months ago	448-64171 448 days ago	41-32344 41 days
25284	alreadydone author:alreadydone	feat(LinearAlgebra/Contraction): bijectivity of `dualTensorHom` + generalize to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	167/32	Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Finiteness/Finsupp.lean	5	16	['alreadydone', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	300-22745 9 months ago	306-74912 306 days ago	45-36570 45 days
22749	joelriou author:joelriou	feat(CategoryTheory/Abelian): the Gabriel-Popescu theorem as a localization with respect to a Serre class	This PR introduces a structure `GabrielPopescuPackage C` which contains the information to say that the abelian category `C` is a localization of a category of modules with respect to a suitable Serre class. --- - [x] depends on: #26033 - [ ] depends on: #26663 - [x] depends on: #22733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	202/6	Mathlib.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Bousfield.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	299-66031 9 months ago	319-51832 319 days ago	0-10614 2 hours
24668	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra): add inductive principle for the free product of algebras	* Add `FreeProduct.inductionOn` and `.asPowers.inductionOn`. - [ ] depends on: #24532 --- * `simp↓` on `empty_rel'_bot`: the LHS is indeed not in simp-normal form, but `simp` can't solve the full lemma (if only because `Function.onFun` isn't marked `@[simp]`) and the actual simp-normal form of `rel'` isn't terribly useful for humans. Since I do expect users to type `rel' R A` by hand, I claim this use of `simp↓` is justified. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	205/9	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	297-10213 9 months ago	376-22422 376 days ago	0-229 3 minutes
13973	digama0 author:digama0	feat: lake exe refactor, initial framework	This is the initial framework code for `lake exe refactor`. To use it, you add your refactoring to `Refactor/Main.lean` (note, you have to actually write some metaprogramming code here for the refactoring itself), and the harness will run it on specified files and apply the generated edits. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	139/0	Refactor/Main.lean,lakefile.lean	2	11	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	293-50204 9 months ago	642-53657 642 days ago	6-30547 6 days
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP t-category-theory new-contributor merge-conflict	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	291-60458 9 months ago	828-53384 828 days ago	7-63253 7 days
25914	eric-wieser author:eric-wieser	feat: add an ext lemma for the opposite category	This powers up `aesop_cat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory awaiting-CI	18/56	Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/CategoryTheory/Abelian/Opposite.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/GuitartExact/Opposite.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Functor.lean,Mathlib/Combinatorics/Quiver/Basic.lean	9	7	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'robin-carlier']	nobody	291-58101 9 months ago	337-47517 337 days ago	0-523 8 minutes
20208	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- Alternate version of #14237 generalized to use `IsLocalization` and `IsFractionRing` rather than `Localization.AtPrime` and `FractionRing` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	248/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	291-43344 9 months ago	511-24445 511 days ago	0-21 21 seconds
24260	plp127 author:plp127	feat(Topology): add API for Hereditarily Lindelof spaces	Copies the stuff about Lindelof spaces to Hereditarily Lindelof spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	222/42	Mathlib/Topology/Compactness/Lindelof.lean	1	15	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'urkud']	urkud assignee:urkud	291-12916 9 months ago	362-59956 362 days ago	29-42365 29 days
27225	eric-wieser author:eric-wieser	refactor(Tactic/Lift): deprecate the third with argument	We already have a number of tactics where the clearing happens all the time, and you have to opt out with `id h`. This also fixes a bug where `lift z to Nat with n hn this_is_unused` would silently ignore `this_is_unused`. --- - [ ] depends on: #27223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta merge-conflict	21/9	Mathlib/Tactic/Lift.lean,MathlibTest/lift.lean	2	9	['JovanGerb', 'adomani', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'vihdzp']	JovanGerb assignee:JovanGerb	289-8827 9 months ago	289-55727 289 days ago	15-64386 15 days
25238	Hagb author:Hagb	feat(Tactic/ComputeDegree): add support for scalar multiplication with different types	It would be able to deal with `a • (X : R[X])` where `a : S` is in a different type `S` with `[SMulZeroClass S R]`. --- - [x] depends on: #25237 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta new-contributor	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	287-66649 9 months ago	318-1918 318 days ago	38-26044 38 days
22909	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Pure): pure submodules	A submodule `N` of an `R`-module is pure if all maps `S ⊗[R] N → S ⊗[R] M` deduced by base change from the injection of `N` into `M` are injective, for all `R`-algebras `S`. This is expressed by the class `Submodule.IsPure`. For type theoretic reason, the definition of `Submodule.IsPure` only considers algebras `S` in the same universe as `R`, but `Submodule.IsPure.baseChange_injective` establishes the property for all universes. * `Submodule.IsComplemented.isPure` : a complemented submodule is pure. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [ ] depends on: #22908 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory blocked-by-other-PR	592/3	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Pure.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	286-68791 9 months ago	431-19597 431 days ago	0-1047 17 minutes
22908	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Finiteness/Small): tensor product of the system of small submodules	The directed limit of a tensor product for the directed system of small submodules. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [x] depends on: #22911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory blocked-by-other-PR	624/2	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/Small.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	286-68743 9 months ago	431-19596 431 days ago	0-3552 59 minutes
22898	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/TensorProduct/DirectLimit/FG): direct limit of finitely generated submodules and tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-ring-theory	399/0	Mathlib.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/DirectLimit/FG.lean	5	9	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'leanprover-community-bot-assistant']	nobody	286-68736 9 months ago	421-14837 421 days ago	10-44390 10 days
20431	erdOne author:erdOne	feat(RingTheory/AdicCompletion): monotonicity of adic-completeness	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	206/16	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Mono.lean,Mathlib/RingTheory/Finiteness/Ideal.lean	7	13	['chrisflav', 'erdOne', 'github-actions']	nobody	286-68692 9 months ago	462-67726 462 days ago	32-78180 32 days
19596	Command-Master author:Command-Master	feat(RingTheory/Valuation/PrimeMultiplicity): define `WithTop ℤ`-valued prime multiplicity on a fraction field	Moves: - `multiplicity_addValuation` -> `AddValuation.multiplicity` - `multiplicity_addValuation_apply` -> `AddValuation.multiplicity_apply` --- - [x] depends on: #19149 - [x] depends on: #18786 - [x] depends on: #19122 - [x] depends on: #18954 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory large-import	101/37	Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Valuation/PrimeMultiplicity.lean	3	11	['ChrisHughes24', 'Command-Master', 'Vierkantor', 'faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	286-68677 9 months ago	491-44611 491 days ago	8-2214 8 days
18646	jxjwan author:jxjwan	feat(RingTheory): isotypic components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory new-contributor	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	286-68670 9 months ago	539-62263 539 days ago	20-16585 20 days
17246	pechersky author:pechersky	feat(RingTheory/PrimaryDecomposition): PIR of Noetherian under jacobson condition	--- - [x] depends on: #17634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	653/1	Mathlib.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/PrimaryDecomposition.lean,docs/references.bib	8	8	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	286-68664 9 months ago	548-4157 548 days ago	13-7138 13 days
21474	erdOne author:erdOne	feat(RingTheory): replace `Ring.DimensionLEOne` with `Ring.KrullDimLE`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory large-import	285/170	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/DedekindDomain/Dvr.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/Localization.lean,Mathlib/RingTheory/KrullDimension/Polynomial.lean,Mathlib/RingTheory/KrullDimension/Quotient.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean,Mathlib/RingTheory/Nilpotent/End.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/PID/Quotient.lean,Mathlib/RingTheory/PrincipalIdealDomain.lean,Mathlib/RingTheory/Spectrum/Maximal/Localization.lean	16	1	['github-actions']	nobody	286-68608 9 months ago	467-48645 467 days ago	0-81 1 minute
11212	shuxuezhuyi author:shuxuezhuyi	feat(GroupTheory/GroupAction): instance `MulAction (β ⧸ H) α`	We instance this naturally from `MulAction β α` when `H` is a normal subgroup and acts trivially on `α`. We also instance `IsometricSMul (M ⧸ N) X` in this way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-group-theory large-import	53/1	Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean	2	6	['YaelDillies', 'github-actions', 'grunweg', 'urkud']	eric-wieser assignee:eric-wieser	286-68400 9 months ago	499-69739 499 days ago	193-73871 193 days
17469	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Presheaf): the presheaf of relative differentials	Given a functor `F : C ⥤ D`, presheaves of commutative rings `S`, `R` and a morphism `φ : S ⟶ F.op ⋙ R`, we show that derivations relative to `φ` are representable by a presheaf of `R`-modules. This is obtained by reducing to the case of absolute differentials. The construction shall allow to deduce the presheaf version of the cokernel sequence $$f^\star \Omega_{Y/S} ⟶ \Omega_{X/S} ⟶ \Omega_{X/Y} ⟶ 0$$ when `f : X ⟶ Y` and `g : Y ⟶ S` are morphisms of schemes. --- - [x] depends on: #17366 - [x] depends on: #19507 - [x] depends on: #17388 - [x] depends on: #16755 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory large-import merge-conflict t-algebraic-geometry	391/10	Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean	1	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	286-12951 9 months ago	589-56058 589 days ago	0-530 8 minutes
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor large-import merge-conflict awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	3	['b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	281-72211 9 months ago	482-47026 482 days ago	9-59130 9 days
20267	joelriou author:joelriou	feat(CategoryTheory): comma categories are accessible	--- (I shall probably not work on this PR in the near future.) - [ ] depends on: #19937 - [ ] depends on: #19945 - [ ] depends on: #19959 - [ ] depends on: #20005 - [ ] depends on: #19955 - [x] depends on: #20263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-category-theory	1513/7	Mathlib.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/CardinalArrow.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Limits/Comma.lean,Mathlib/CategoryTheory/Limits/TypesFiltered.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Comma.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/ParallelMaps.lean,Mathlib/SetTheory/Cardinal/HasCardinalLT.lean,docs/references.bib	15	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	281-65178 9 months ago	unknown	0-0 0 seconds
24862	grunweg author:grunweg	feat(LocallyIntegrable): generalise more to enorms	--- Note: github's diff is very confused; it includes changes which very clearly are already on the master branch. I'll see which of the remaining changes after the dependencies have landed is already polished enough. - [x] depends on: #24352 - [x] depends on: #27457 (this half is settled already) - [ ] open question: filter lemmas; IsBoundedUnder is not the right condition as-is; need to think (or just not generalise) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP carleson t-measure-probability	171/88	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	280-43455 9 months ago	370-24814 370 days ago	0-1 1 second
27003	eric-wieser author:eric-wieser	chore: use `Simp.ResultQ` more often	Also uses `~q` in place of manual `isDefEq` matching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	18/22	Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/ReduceModChar.lean	3	7	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	278-64358 9 months ago	278-64359 278 days ago	32-70098 32 days
25401	digama0 author:digama0	feat(Util): SuppressSorry option	See also leanprover/lean4#8611 and [#lean4 > Silent sorry @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Silent.20sorry/near/503537964). This is a stop-gap solution while leanprover/lean4#8611 is underway, but it works about as well as any other built in option. Hooking declaration elaborators turns out to be a very powerful technique. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	342/0	Mathlib.lean,Mathlib/Util/CommandElabHook.lean,Mathlib/Util/SuppressSorry.lean,MathlibTest/suppressSorry.lean	4	15	['digama0', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	278-19154 9 months ago	278-19154 278 days ago	71-27957 71 days
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. Note the issue with the existing `MonadExcept` instance still applies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta	16/0	Mathlib/Control/Monad/Cont.lean	1	25	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	273-62709 9 months ago	699-75511 699 days ago	339-54818 339 days
24793	tristan-f-r author:tristan-f-r	feat: trace of unitarily similar matrices	adds a theorem relating trace to unitarily similar matrices used in the easy direction of specht's theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	7/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	4	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'tristan-f-r']	nobody	272-18273 8 months ago	370-49722 370 days ago	1-55872 1 day
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ --- - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #26670 (split PR: adds the first part of the `Abelian` file) Here is a relevant TODO in Mathlib: https://github.com/leanprover-community/mathlib4/blob/4e9fa40d7c480937e09cd6e47a591bd6f3b8be42/Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean#L46-L48 I would appreciate your comments. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR new-contributor label:t-algebra$	750/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	5	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	270-33815 8 months ago	493-4374 493 days ago	43-22586 43 days
7300	ah1112 author:ah1112	feat: synthetic geometry	This is adding synthetic geometry using Avigad's axioms and formalizing Euclid Book I, through the Pythagorean theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted t-euclidean-geometry	2661/0	Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean	4	74	['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'plp127', 'tb65536', 'urkud']	nobody	270-10446 8 months ago	970-49331 970 days ago	0-84 1 minute
24719	madvorak author:madvorak	feat(LinearAlgebra/Matrix/NonsingularInverse): inverting `Matrix` inverts its `LinearEquiv`	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2324719.20cannot.20find.20home/with/517142655	awaiting-author t-algebra label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	16	['eric-wieser', 'github-actions', 'madvorak', 'ocfnash']	nobody	265-71326 8 months ago	287-53303 287 days ago	86-37603 86 days
25208	erdOne author:erdOne	feat(LinearAlgebra): `tensor_induction` macro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	87/116	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Central/TensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/Finite.lean,Mathlib/RingTheory/Unramified/Finite.lean	8	8	['chrisflav', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	259-35 8 months ago	357-57882 357 days ago	0-600 10 minutes
13036	joelriou author:joelriou	feat(CategoryTheory/Sites): under certain conditions, cover preserving functors preserve 1-hypercovers	Previously, in order to show that a functor between Grothendieck sites was continuous, it was necessary to show that it was "cover preserving" and "compatible preserving". There were two lemmas which could be used in order to show that a functor was "compatible preserving". Since #13012, the better condition of "1-hypercover preserving" functor was introduced and it implies that the functor is continuous. In this PR, under the same assumptions as in the two lemmas mentionned above, we show that cover preserving functors are 1-hypercover preserving functors. This gives slightly better criteria in order to show that a functor is continuous. --- - [x] depends on: #13004 - [x] depends on: #13011 - [x] depends on: #13012 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	94/7	Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	4	3	['github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	250-21983 8 months ago	729-60915 729 days ago	0-1 1 second
27335	eric-wieser author:eric-wieser	chore(Data/List): use simp-normal-form for boolean equalities	This replaces `¬(p x = true)` with `p x = false`. It also makes explicit some adjacent `h : p x` spellings for symmetry, but the `= true`s were already implied by the coercion. Zulip: [#lean4 > `h : ¬(b = true)` vs `h : b = false` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/.60h.20.3A.20.C2.AC.28b.20.3D.20true.29.60.20vs.20.60h.20.3A.20b.20.3D.20false.60/near/529976237) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	38/32	Mathlib/Data/List/DropRight.lean,Mathlib/Data/List/SplitOn.lean,Mathlib/Data/List/TakeWhile.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	250-5625 8 months ago	301-810 301 days ago	0-19242 5 hours
22517	j-loreaux author:j-loreaux	feat: `ℕ+` powers in semigroups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP large-import	275/28	Mathlib.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/PNatPowAssoc.lean,Mathlib/Algebra/Group/PPow.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	14	6	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mattrobball']	nobody	248-25966 8 months ago	441-27547 441 days ago	0-27 27 seconds
29615	eric-wieser author:eric-wieser	chore: add a computable shortcut for `AddCommMonoid ℂ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy	9/1	Mathlib/Analysis/Complex/Basic.lean	1	1	['github-actions']	nobody	247-66825 8 months ago	247-66908 247 days ago	247-66900 247 days
25069	erdOne author:erdOne	feat(EllipticCurve): rational points of singular nodal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	251/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Node.lean	3	14	['Multramate', 'acmepjz', 'chrisflav', 'erdOne', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	246-41167 8 months ago	262-72976 262 days ago	100-20892 100 days
25070	erdOne author:erdOne	feat(EllipticCurve): rational points on singular cuspidal cubics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	123/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Singular/Cusp.lean	2	12	['Multramate', 'acmepjz', 'adamtopaz', 'erdOne', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	246-41166 8 months ago	272-42130 272 days ago	90-52970 90 days
28580	kmill author:kmill	refactor: simplify implementation of `filter_upwards`	This PR makes a few changes to `filter_upwards`: - it uses `focus`, which prevents multiGoalLinter from ever blaming the tactics used inside its implementation - it constructs the whole proof syntax and elaborates it at once using `evalTactic` and `refine`, rather than using the lower-level TermElab API, which can lose track of goals - it's written in a way that doesn't require goals to be in some particular order This was motivated by some multiGoalLinter issues I ran into when working on https://github.com/leanprover/lean4/pull/9942 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-order t-meta	14/16	Mathlib/Order/Filter/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	245-53519 8 months ago	274-1184 274 days ago	0-8809 2 hours
7125	eric-wieser author:eric-wieser	feat: additive monoid structure via biproducts	I suspect I'm missing a trick with these transport lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory awaiting-CI	237/0	Mathlib/CategoryTheory/Limits/Skeleton.lean	1	3	['alreadydone', 'eric-wieser', 'mathlib4-merge-conflict-bot']	nobody	243-26624 8 months ago	unknown	0-0 0 seconds
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-number-theory	253/1	Mathlib.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroMulInt.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean	7	33	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky', 'smmercuri', 'xroblot']	nobody	234-51610 7 months ago	315-51547 315 days ago	73-10873 73 days
23621	astrainfinita author:astrainfinita	chore: deprecate `LinearOrderedComm{Monoid, Group}WithZero`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #20676	merge-conflict t-algebra t-order label:t-algebra$	261/205	Archive/Imo/Imo1998Q2.lean,Counterexamples/LinearOrderWithPosMulPosEqZero.lean,Mathlib/Algebra/Order/Field/Canonical.lean,Mathlib/Algebra/Order/Field/Rat.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/NNRat/Lemmas.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/RingTheory/Valuation/Archimedean.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ExtendToLocalization.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/Integral.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/RingTheory/Valuation/Quotient.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/RingTheory/Valuation/ValExtension.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	44	24	['YaelDillies', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	226-46034 7 months ago	397-18407 397 days ago	5-42380 5 days
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	50	['EtienneC30', 'arulandu', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	arulandu assignee:arulandu	220-41954 7 months ago	610-69503 610 days ago	1-21124 1 day
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order delegated easy	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	214-33322 7 months ago	235-65412 235 days ago	3-79002 3 days
19616	adamtopaz author:adamtopaz	fix: fix the definition of the absolute Galois group of a field	Previously it was defined as the Galois group of the algebraic closure, as opposed to the separable closure. Also, this adds some missing instances for this group. Still missing is compactness, but that seems like a bigger project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-number-theory label:t-algebra$	23/8	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/FieldTheory/KrullTopology.lean	2	4	['acmepjz', 'alreadydone', 'github-actions']	nobody	212-74944 7 months ago	531-53440 531 days ago	3-64280 3 days
25225	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Eulerian walk in connected graph contains all vertices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-combinatorics new-contributor	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	6	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	209-15736 6 months ago	209-15736 209 days ago	148-3286 148 days
24532	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): fill out the `FreeProduct.asPowers` namespace	* Replicate the existing API for `LinearAlgebra.FreeProduct` under `FreeProduct.asPowers`, for convenience when working primarily with the power algebra representation * Adds convenience lemmas for using the corresponding quotient relation `rel'` (used in the above). --- - [x] depends on: #24531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	122/5	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	26	['YaelDillies', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robertmaxton42']	nobody	208-5586 6 months ago	372-79417 372 days ago	0-47665 13 hours
25692	Whysoserioushah author:Whysoserioushah	feat(RingTheory/MatrixAlgebra): add a more general version of `matrixEquivTensor`	This adds `tensorMatrixLinearEquiv : A ⊗[R] Matrix n n B ≃ₐ[S] Matrix n n (A ⊗[R] B)` which is a more general version of `matrixEquivTensor : Matrix n n A ≃ₐ[R] (A ⊗[R] Matrix n n R)`. The latter is then implemented as a trivial consequence of the former. Many internal implementation details are deleted without deprecation, although strictly these were not private. Co-authored-by: @erdOne Co-authored-by: Eric Wieser --- - [ ] depends on: #28367 - [ ] depends on: #28359 - [ ] depends on: #28368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	129/110	Mathlib/RingTheory/MatrixAlgebra.lean	1	28	['Whysoserioushah', 'chrisflav', 'eric-wieser', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	chrisflav assignee:chrisflav	196-50435 6 months ago	272-73331 272 days ago	47-13209 47 days
25012	urkud author:urkud	refactor(*): migrate from `Matrix.toLin'` to `Matrix.mulVecLin`	or `Matrix.mulVec` whenever we don't need the `LinearEquiv.symm` part. See [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.2EtoLin'.20vs.20Matrix.2EmulVecLin/with/515188548). It makes sense to have only one normal form, and `Matrix.toLin'` has an extra `DecidableEq` assumption. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	165/126	Mathlib/Algebra/Lie/Matrix.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/Matrix/BilinearForm.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean,Mathlib/LinearAlgebra/Matrix/Diagonal.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Matrix/ToLinearEquiv.lean,Mathlib/LinearAlgebra/UnitaryGroup.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean	19	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	196-32836 6 months ago	344-58314 344 days ago	14-81673 14 days
15651	TpmKranz author:TpmKranz	feat(Computability/NFA): operations for Thompson's construction	Lays the groundwork for a proof of equivalence of RE and NFA, w.r.t. described language. Actual connection to REs comes later, after the groundwork for the opposite direction has been laid. Third chunk of #12648 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	307/5	Mathlib/Computability/NFA.lean	1	27	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	182-22779 6 months ago	601-50167 601 days ago	45-84611 45 days
12032	mcdoll author:mcdoll	feat: delta distribution as a limit	--- - [ ] depends on: #11496 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	58/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	182-5753 6 months ago	769-50319 769 days ago	0-1 1 second
9693	madvorak author:madvorak	feat: Linear programming in the standard form	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) - [x] depends on: #9652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/LinearProgramming.lean	2	15	['apurvanakade', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	181-56525 6 months ago	684-64517 684 days ago	168-78821 168 days
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'trivial1711']	nobody	181-39020 6 months ago	527-2550 527 days ago	23-54870 23 days
5745	alexjbest author:alexjbest	feat: a tactic to consume type annotations, and make constructor nicer	During the copenhagen masterclass I found some situations where applying the constructor tactic left the goal in a difficult to read state when autoParams were present. We add a simple tactic to clean these up, and a macro for `constructor` to behave more like the constructor notation and do this automatically (constructor is in core) It seems that these things should be cleaned up by simp, but a simp lemma to remove these annotations is not accepted by lean as the types are too similar. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	41/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Consume.lean,test/consume.lean	4	5	['alexjbest', 'digama0', 'kim-em', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76879 5 months ago	996-13341 996 days ago	51-33889 51 days
5863	eric-wieser author:eric-wieser	feat: add elaborators for concrete matrices	--- - [x] depends on: #5866 - [ ] depends on: #5897 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict help-wanted blocked-by-other-PR t-meta	257/7	Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Matrix/Auto.lean,MathlibTest/matrix_auto.lean	3	8	['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-76878 5 months ago	1040-56539 1040 days ago	0-1 1 second
5919	MithicSpirit author:MithicSpirit	feat: implement orthogonality for AffineSubspace	Define `AffineSubspace.orthogonal` and `AffineSubspace.IsOrtho`, as well as develop an API emulating that of `Submodule.orthogonal` and `Submodule.IsOrtho`, respectively. Additionally, provide some relevant lemmas exclusive to affine subspaces, which are mostly to do with the relationship between orthogonality and `AffineSubspace.Parallel`. Closes #5539 --- Still WIP as I need to add more docstrings as well as notations for the new definitions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor merge-conflict help-wanted t-analysis	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	7	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	MithicSpirit assignee:MithicSpirit	180-76877 5 months ago	864-15372 864 days ago	0-433 7 minutes
7386	madvorak author:madvorak	feat: Define linear programs	Linear programs over a general `Module` with constraints given in the form "aᵀx - b ≥ 0" and the objective function as an `AffineMap` to be minimized. --- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	87/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	64	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	180-76874 5 months ago	684-64505 684 days ago	232-74885 232 days
9352	chenyili0818 author:chenyili0818	feat: arithmetic lemmas for `gradient`	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties Co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	31	['chenyili0818', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'winstonyin']	nobody	180-76749 5 months ago	818-55198 818 days ago	52-1358 52 days
9795	sinhp author:sinhp	feat: the type `Fib` of fibre of a function at a point	This is the most basic file of the theory of fibred categories developed here: https://github.com/sinhp/LeanFibredCategories/tree/master --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	74/0	Mathlib.lean,Mathlib/Data/Fiber.lean	2	18	['adri326', 'joelriou', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	180-76748 5 months ago	850-72919 850 days ago	2-35530 2 days
10660	eric-wieser author:eric-wieser	feat(LinearAlgebra/CliffordAlgebra): construction from a basis	This is adapted from https://github.com/eric-wieser/lftcm2023-clifford_algebra, which only worked for the special case of `Q = 0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author t-algebra label:t-algebra$	573/0	Mathlib.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basis.lean	2	16	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76744 5 months ago	unknown	0-0 0 seconds
10977	grunweg author:grunweg	feat: germs of smooth functions	Define the space of germs of smooth functions (between manifolds). Endow it with a ring structure if the target manifold is a smooth ring (e.g., a Lie group or a field). From the sphere eversion project, rewritten by me. Co-authored-by: Patrick Massot ------- Particular questions for review - is the authorship/copyright information appropriate? (`PatrickMassot` created the file `SmoothGerm` which I adapted; I didn't trace this far back through sphere-eversion.) - is providing all the intermediate algebraic structures (such as, an additive subgroup) on the space of smooth germs useful in practice? (The sphere eversion project only needs a ring structure.) - any further particular API lemmas (e.g., around coercions) which would be good to add? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author t-topology t-analysis	150/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothGerm.lean	2	34	['YaelDillies', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'mathlib4-merge-conflict-bot', 'mcdoll']	fpvandoorn assignee:fpvandoorn	180-76743 5 months ago	629-52378 629 days ago	144-63944 144 days
10998	hmonroe author:hmonroe	feat(Logic): Arithmetization of partial recursive functions (toward Gödel's first incompleteness theorem)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	364/0	Mathlib.lean,Mathlib/Logic/Godel/PartArith.lean	2	4	['Ruben-VandeVelde', 'YaelDillies', 'mathlib4-merge-conflict-bot']	nobody	180-76742 5 months ago	711-45270 711 days ago	99-83915 99 days
11890	adomani author:adomani	feat: the terminal refine linter	A linter that warns on usages of `refine` and `refine'` as a finishing tactic. See this [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Usage.20of.20refine'). ### Conclusion of the experiment Systematic replacements of terminal `refine` with `exact` leads to an overall slow-down. --- - [ ] depends on: #15616 (disable the linter in downstream projects) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	15	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	180-76618 5 months ago	643-24724 643 days ago	18-28993 18 days
12006	adomani author:adomani	feat: the `suffa` tactic	The `suffa` tactic. `suffa tac` runs the tactic sequence `tac` and returns a `Try this:` suggestion of the form `suffices [target_after_tac] by tac; assumption`. For example ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffa rewrite [Nat.zero_add] assumption ``` suggests the replacement ```lean example {m n : Nat} (h : m = n) : 0 + m = n := by suffices m = n by rewrite [Nat.zero_add] assumption assumption ``` See [this thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Try.20this.3A.20suffices.20simpa) as well as [this message](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2311822.20flexible.20tactics.20linter/near/431895664). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	161/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Suffa.lean,test/Suffa.lean	4	4	['MoritzBeroRoos', 'YaelDillies', 'mathlib4-merge-conflict-bot']	nobody	180-76615 5 months ago	711-61993 711 days ago	59-762 59 days
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict modifies-tactic-syntax awaiting-author help-wanted t-meta	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	11	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	180-76613 5 months ago	630-68699 630 days ago	0-16 16 seconds
14237	js2357 author:js2357	feat: Define the localization of a fractional ideal at a prime ideal	Define the localization of a fractional ideal at a prime ideal, and prove some basic properties. --- This PR is part 3 out of 4 of a proof of `isDedekindDomain_iff_isDedekindDomainDvr`. Part 4 is available here: #14242 - [x] depends on: #14099 Part 1 - [x] depends on: #14216 Part 2 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	22	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	180-76611 5 months ago	629-50434 629 days ago	6-3525 6 days
14345	digama0 author:digama0	feat: the Dialectica category is monoidal closed	- [x] depends on: #14274 The monoidal closed structure of the Dialectica category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	252/0	Mathlib.lean,Mathlib/CategoryTheory/Dialectica/Closed.lean	2	4	['github-actions', 'kim-em', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76488 5 months ago	672-42042 672 days ago	12-20456 12 days
14727	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a flat module has vanishing higher Tor groups	[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	37/1	Mathlib/RingTheory/Flat/CategoryTheory.lean	1	4	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76486 5 months ago	670-24087 670 days ago	3-28223 3 days
14733	jjaassoonn author:jjaassoonn	feat(RingTheory/Flat/CategoryTheory): a module is flat iff tensoring preserves finite limits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-ring-theory	99/1	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/RightExact.lean,Mathlib/RingTheory/Flat/CategoryTheory.lean	4	3	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76484 5 months ago	667-35948 667 days ago	6-6256 6 days
15055	sinhp author:sinhp	feat: the category of pointed objects of a concrete category	This file defines the category of pointed objects of a concrete category. After this we will have the categories of pointed groups, pointed abelian groups, pointed groupoids, etc. To define `Pointed.functor`, we need to add the following "pullback" construction to the category of elements. ``` @[simps obj map] def pullback (F : D ⥤ Type w) (G : C ⥤ D) : (G ⋙ F).Elements ⥤ F.Elements where obj X := ⟨G.obj X.1, X.2⟩ map {X Y} f := ⟨G.map f.1, f.2⟩ ``` This is called pullback since the display map of `G ⋙ F` (i.e. `π (G ⋙ F)`) is a pullback of the display map of `F`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	185/0	Mathlib.lean,Mathlib/CategoryTheory/ConcreteCategory/Pointed.lean,Mathlib/CategoryTheory/Elements.lean	3	14	['dagurtomas', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	180-76483 5 months ago	656-61825 656 days ago	7-80557 7 days
15224	AnthonyBordg author:AnthonyBordg	feat(CategoryTheory/Sites): covering families and their associated Grothendieck topology	Define covering families on a category and their associated Grothendieck topology by using the API for `Coverage`. Give an explicit characterization of the covering sieves of the said topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	21	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	180-76482 5 months ago	656-42713 656 days ago	1-48443 1 day
16303	grunweg author:grunweg	feat(CI): check for badly formatted titles or missing/contradictory labels	--- The zulip workflow is entirely cargo-culted from #16296; please review carefully. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author CI	325/0	.github/build.in.yml,Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/ValidatePRTitle.lean,MathlibTest/ValidatePRTitle.lean,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean	8	45	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	180-76478 5 months ago	499-25571 499 days ago	78-4556 78 days
18236	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): the endofunctor of presheaves of modules induced by an oplax natural transformation	An endomorphism of ` ModuleCat.restrictScalarsPseudofunctor`, i.e. a "compatible" family of functors `ModuleCat A ⥤ ModuleCat A` for all (commutative) rings `A` induces a functor `PresheafOfModules R ⥤ PresheafOfModules R` for any presheaf of (commutative) rings `R`. In #18262, this is applied to the construction of exterior powers of a presheaves of modules. --- - [x] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory awaiting-CI merge-conflict awaiting-author label:t-algebra$	180/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean	2	6	['github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76327 5 months ago	unknown	0-0 0 seconds
18749	GabinKolly author:GabinKolly	feat(ModelTheory): preparatory work for the existence of Fraïsse limits	Define the map of a PartialEquiv through an embedding, and related properties. Define embeddings and equivalences between equal structures or equal substructures, and related properties. Add miscellaneous lemmas which will be used to prove the existence of fraisse limits. --- This is preparation for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	308/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	5	10	['GabinKolly', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	180-76324 5 months ago	483-38884 483 days ago	73-63475 73 days
18876	GabinKolly author:GabinKolly	feat(ModelTheory/Fraisse): add proof that Fraïssé limits exist	Fraïssé limits exist. --- All the preparatory work done in other files is contained in the pull request #18749, this pull request adds the work done in ModelTheory/Fraisse, the definition of the sequence of structures whose limit will be the Fraïssé limit, lemmas about this sequence, and then the proof that the limit is indeed a Fraïssé limit. - [ ] depends on: #18749 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-logic	666/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76322 5 months ago	553-47656 553 days ago	0-37 37 seconds
19323	madvorak author:madvorak	feat: Function to Sum decomposition	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Function.20to.20Sum.20decomposition	merge-conflict WIP t-data	50/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean	2	3	['github-actions', 'madvorak', 'mathlib4-merge-conflict-bot']	nobody	180-76321 5 months ago	500-56554 500 days ago	43-18002 43 days
19378	adamtopaz author:adamtopaz	feat: Explanation widgets	This adds some simple widgets, wrapped in a tactic, term and command elaborator, for displaying markdown explanations in the infoview. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	101/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Widget/Explain.lean	3	9	['adamtopaz', 'eric-wieser', 'github-actions', 'joneugster', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	180-76320 5 months ago	492-47291 492 days ago	49-76666 49 days
19456	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Finsupp/MonomialOrder/DegRevLex): homogeneous reverse lexicographic order	Definition of the homogeneous reverse lexicographic order --- - [x] depends on: #19453 - [x] depends on: #19455 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-order t-data merge-conflict t-algebraic-geometry	362/0	Mathlib.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76319 5 months ago	539-67495 539 days ago	0-27 27 seconds
20051	Timeroot author:Timeroot	feat: `Clone` and some instances	Defines clones (`Clone`). And there is a file, `Instances.lean`, that gives several most important examples of Clones. In particular, it has all of the clones (in an appropriately general form) that occur in [Post's Lattice](https://en.wikipedia.org/wiki/Post%27s_lattice), and [later proving](https://github.com/leanprover-community/mathlib4/pull/24744) the completeness of Post's Lattice is why I'm making this PR. (Edit: Used to also say "Defined operads (`Operad`), symmetric operads (`SymmOperad`), and clones ... There is a proof that all clones have a natural operad structure.". This has been scrapped.) --- - [x] depends on: #20133 [basics and notations] - [x] depends on: #20134 [permutations] - [x] depends on: #20138 [operad] - [x] depends on: #20141 [clone] - [x] depends on: #23459 [defs] - [ ] depends on: #23460 [basic] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra blocked-by-other-PR label:t-algebra$	623/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Algebra/Clone/Instances.lean,Mathlib/Data/Fin/Basic.lean	5	33	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'wmacmil']	nobody	180-76191 5 months ago	unknown	0-0 0 seconds
20466	MohanadAhmed author:MohanadAhmed	feat: Sherman Morrison formula for rank 1 update of the matrix inverse	Provides the Sherman Morrison rank 1 update of the matrix inverse https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	37/0	Mathlib/Data/Matrix/Invertible.lean	1	5	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76189 5 months ago	476-49973 476 days ago	23-30652 23 days
20648	anthonyde author:anthonyde	feat: formalize regular expression -> εNFA	The file `Computability/RegularExpressionsToEpsilonNFA.lean` contains a formal definition of Thompson's method for constructing an `εNFA` from a `RegularExpression` and a proof of its correctness. --- - [x] depends on: #20644 - [x] depends on: #20645 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-zulip new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	7	['anthonyde', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'meithecatte', 'qawbecrdtey']	nobody	180-76188 5 months ago	378-22717 378 days ago	75-77754 75 days
20649	GabinKolly author:GabinKolly	feat(ModelTheory/Graph): prove characterization of the fraisse limit of finite simple graphs	Prove that a countable graph with the extension property must be the Fraisse limit of finite simple graphs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP large-import merge-conflict t-combinatorics t-logic	175/0	Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Substructures.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76186 5 months ago	unknown	0-0 0 seconds
20652	jjaassoonn author:jjaassoonn	feat: categorical description of center of a ring	We show the isomorphism between `Z(R)` and `End(1 Mod-R)` --- - [x] depends on:#20721 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra t-category-theory label:t-algebra$	212/21	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Center.lean,Mathlib/CategoryTheory/Conj.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean	7	42	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'qawbecrdtey']	nobody	180-76185 5 months ago	468-73615 468 days ago	5-77051 5 days
20924	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity): Oracle-based computation	This PR adds the types and lemmas for oracle-based computation. In this model, computations are run on a monad which also counts the number of oracle queries executed. With it, it becomes possible to reason about the upper bound of the query complexity of algorithms. In the future, we could extend this work to include the necessary bits from information theory and probability to also reason about lower bounds on query complexity, like the work in https://github.com/girving/debate. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	60	['eric-wieser', 'girving', 'github-actions', 'mathlib4-merge-conflict-bot', 'quangvdao', 'tomaz1502']	nobody	180-76184 5 months ago	450-11079 450 days ago	27-32630 27 days
20956	tomaz1502 author:tomaz1502	feat(Computability/QueryComplexity/Sort.lean): Formalization of upper bound of queries for merge sort	This PR builds on top of #20924 to prove that merge sort (as defined in Lean's library) never executes more than `3 * n * ceil_log2 n` comparisons, where `n` is the size of the input list and `ceil_log2` is the ceil of the logarithm in base 2, which is defined in this PR. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2318629.20runtime.20complexity.20of.20sorting.20a.20list - [ ] depends on: #20924 Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability blocked-by-other-PR	676/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76182 5 months ago	481-44743 481 days ago	0-41 41 seconds
21270	GabinKolly author:GabinKolly	feat(ModelTheory/Bundled): first-order embeddings and equivalences from equalities	Add first-order embeddings and equivalences from equalities between bundled structures. --- Add two definitions to get embeddings and equivalences from equalities between bundled structures, and simple properties. This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author large-import t-logic	102/0	Mathlib/ModelTheory/Bundled.lean	1	27	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76180 5 months ago	399-77993 399 days ago	50-58472 50 days
21277	GabinKolly author:GabinKolly	feat(ModelTheory/PartialEquiv): Define the mapping of a self-partialEquiv through an embedding	Define the mapping of a self-partialEquiv through an embedding and the notion of fully extendable partialEquiv. --- This is some preparatory work for #18876 - [ ] depends on: #21276 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-logic	215/5	Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76178 5 months ago	473-26156 473 days ago	0-668 11 minutes
21616	peabrainiac author:peabrainiac	feat(Topology): concatenating countably many paths	Adds `Path.countableConcat`, the concatenation of a sequence of paths leading up to some point `x`. --- - [x] depends on: #21591 - [x] depends on: #21607 This work is a prerequisite to #20248, where it is used to show that the topology of first-countable locally path-connected spaces is coinduced by all the paths in that space. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	229/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	31	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac']	nobody	180-76175 5 months ago	393-75556 393 days ago	56-56728 56 days
21624	sinhp author:sinhp	feat(CategoryTheory): The (closed) monoidal structure on the product category of families of (closed) monoidal categories	Given a family of closed monoidal categories, we show that the product of these categories is a closed monoidal category with the pointwise monoidal structure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	20	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	180-76174 5 months ago	406-4016 406 days ago	50-48893 50 days
21829	Whysoserioushah author:Whysoserioushah	feat(LinearAlgebra/TensorProduct/HomTensor): Add TensorProduct of Hom-modules	Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	174/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/HomTensor.lean	2	27	['Whysoserioushah', 'YaelDillies', 'erdOne', 'github-actions', 'kbuzzard', 'mathlib4-merge-conflict-bot']	nobody	180-76172 5 months ago	412-70847 412 days ago	46-53039 46 days
21903	yhtq author:yhtq	feat: add from/toList between `FreeSemigroup` and `List` with relative theorems	Add from/toList between `FreeSemigroup` and `List` with relative theorems, as well as an incidental definition of lexicographic order on `FreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor awaiting-CI large-import merge-conflict label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	12	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76048 5 months ago	407-60003 407 days ago	50-9294 50 days
22159	shetzl author:shetzl	feat: add definition of pushdown automata	Add the definition of pushdown automata and their two acceptance conditions: acceptance based on empty stack and acceptance based on final state. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	35	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	180-76042 5 months ago	427-70055 427 days ago	20-81245 20 days
22231	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion` initial defns	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra awaiting-author t-topology label:t-algebra$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	8	['Thmoas-Guan', 'github-actions', 'grunweg', 'jcommelin', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	180-76038 5 months ago	259-59319 259 days ago	158-37126 158 days
22232	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.apprUpto`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	399/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76036 5 months ago	449-5929 449 days ago	0-414 6 minutes
22233	pechersky author:pechersky	feat(Algebra/Valued): `AdicExpansion.evalAt`	--- - [ ] depends on: #22231 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology blocked-by-other-PR	488/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76035 5 months ago	449-5930 449 days ago	0-412 6 minutes
22302	658060 author:658060	feat: add `CategoryTheory.Topos.Power`	This is a continuation of #21281 with the end goal of defining topoi in Mathlib. It introduces the notion of a power object in a category with a subobject classifier, which is a special case of an internal hom. The definition `HasPowerObjects C` contained in this PR is all that remains before `IsTopos C` can be defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	3	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	180-76033 5 months ago	447-23635 447 days ago	0-1528 25 minutes
22662	plp127 author:plp127	feat: Localization.Away.lift (computably)	This PR adds `Localization.Away.lift'` and `Localization.Away.lift`, computable alternatives to `Localization.awayLift`. --- - [x] depends on: #24791 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	18	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	kim-em assignee:kim-em	180-76026 5 months ago	180-76027 180 days ago	257-28368 257 days
22790	mhk119 author:mhk119	feat: Extend `taylor_mean_remainder_lagrange` to `x < x_0`	The `taylor_mean_remainder_lagrange` theorem has the assumption that $x_0 < x$. In many applications, we need $x < x_0$ and one cannot use the current version to obtain this (see [zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem)). This PR introduces a set of theorems that push negations through Taylor expansions so that one can extend `taylor_mean_remainder_lagrange` to the case when $x < x_0$. These theorems should also be useful elsewhere since they are quite general.	merge-conflict awaiting-author t-analysis new-contributor	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	13	['Paul-Lez', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'mhk119']	nobody	180-76020 5 months ago	409-4737 409 days ago	23-16830 23 days
22861	eric-wieser author:eric-wieser	feat: add the trace of a bilinear form	Following the steps at [#Is there code for X? > Laplacian @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Laplacian/near/450834505). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Some questions: * Does this generalize to multilinear maps? * Is there an `RCLike` generalization? * Does this generalize to `BilinMap` instead of just `BilinForm`? Perhaps the approach in [#mathlib4 > Stating Schrodinger's equation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Stating.20Schrodinger's.20equation/near/500409890) of using `ContinuousLinearMap.adjoint'` is better.	merge-conflict awaiting-author t-algebra label:t-algebra$	100/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Trace.lean	2	4	['github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot']	nobody	180-76018 5 months ago	409-54166 409 days ago	23-44995 23 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- - [x] depends on: #24748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data	178/44	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/Pi.lean	5	31	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	b-mehta assignee:b-mehta	180-76016 5 months ago	355-2887 355 days ago	71-41637 71 days
22954	eric-wieser author:eric-wieser	feat(RingTheory/Congruence/Hom): copy from GroupTheory	This was motivated in review of #22355, but I no longer recall why. It also helps with #29357. Either way, this captures a definition that was inlined in a later file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	214/16	Mathlib/Algebra/RingQuot.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/TwoSidedIdeal/Kernel.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	180-76015 5 months ago	429-57729 429 days ago	0-135 2 minutes
23285	AntoineChambert-Loir author:AntoineChambert-Loir	refactor: directed systems in terms of functors	This is a WIP aiming to refactor the work on directed systems using the category theory library. But there are universes nightmares. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-category-theory large-import merge-conflict label:t-algebra$	111/45	Mathlib/Order/DirectedInverseSystem.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76009 5 months ago	420-21737 420 days ago	0-24 24 seconds
23460	Timeroot author:Timeroot	feat: Definition of `Clone`	Basics about Clones. Part of #20051 --- - [ ] depends on: #26329 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	326/0	Mathlib.lean,Mathlib/Algebra/Clone/Basic.lean,Mathlib/Algebra/Clone/Defs.lean,Mathlib/Data/Fin/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	180-76007 5 months ago	263-38379 263 days ago	65-54502 65 days
23503	apnelson1 author:apnelson1	feat(Topology/Instances/ENat): ENat and tsum	We give API for the interactions between `tsum` and `ENat`. The type is especially nice, because every function is summable, and there are simplifying lemmas like the statement that a sum is infinite iff either some term is infinite, or the support is infinite. This provides one of the missing pieces for working painlessly with discrete objects, 'propositional' finiteness and cardinality. For instance, one can sum a function `f : a -> ENat` over an arbitrary set with the term `∑' a : s, 1`, and it will be provable that `∑' a : s, 1 = s.encard` and `(support f).encard ≤ ∑' a, f a` without ever having to split into finite/infinite cases. As is pointed out in the module docstring for `Data.ENat`, there are strong analogies between `ENat` and `ENNReal`, and the API runs parallel to the API for `tsum`/`ENNReal`. One could call it 'duplication', but I have yet to find a common generalization of the two that saves work, or a third example of a natural type with these same properties. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology large-import	205/2	Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Topology/Instances/ENat.lean	3	3	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-76005 5 months ago	399-30558 399 days ago	14-6036 14 days
23585	plp127 author:plp127	feat: `Filter.atMax` and `Filter.atMin`	Adds `atMax` and `atMin`, filters. Making an analogy, `atMax` : `atTop` :: `IsMax` : `IsTop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	148/0	Mathlib.lean,Mathlib/Order/Filter/AtMaxMin.lean	2	5	['github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'urkud']	nobody	180-76004 5 months ago	unknown	0-0 0 seconds
23758	erdOne author:erdOne	feat(Topology/Algebra): linearly topologized iff non-archimedean	...for topological modules over compact rings or `ℤ`-finite rings --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import merge-conflict awaiting-author t-topology label:t-algebra$	138/3	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Topology/Algebra/LinearTopology.lean	2	22	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	180-76002 5 months ago	282-467 282 days ago	124-78308 124 days
24333	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): cycle graph implementation for generic vertex types	The existing `cycleGraph` implementation under Combinatorics/SimpleGraph/Circulant.lean only operates over `Fin n`. This PR implements a cycle graph implementation over any generic vertex type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics new-contributor	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	42	['IvanRenison', 'github-actions', 'mathlib4-merge-conflict-bot', 'vlad902']	kmill assignee:kmill	180-75867 5 months ago	266-74448 266 days ago	123-18878 123 days
24540	robertmaxton42 author:robertmaxton42	feat(Quiv): add the empty, vertex, point, interval, and walking quivers	Add: * The empty quiver * The vertex quiver (one vertex, and no edges) and the point quiver (one vertex, one self-edge) * The interval quiver (two vertices with an edge between them) * The walking quiver (vertices `0` and `1` with two edges both `0 -> 1`. Functors from the walking quiver to `Type` define quivers, by interpreting `F.obj 0` as the type of vertices, `F.obj 1` as the type of edges, using one of the two edges to label the source of every edge and using the other to label the target.) - [x] depends on: #24538 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory	370/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/Logic/Small/Defs.lean	4	14	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robertmaxton42', 'robin-carlier']	nobody	180-75862 5 months ago	375-21043 375 days ago	0-6849 1 hour
24850	pechersky author:pechersky	feat(Topology/UniformSpace/Ultra): uniform spaces induced by pseudometrics are ultra if system is ultra	Any uniform space has a natural system of pseudometrics definable on it, comprised of those pseudometrics constructed from a descending chain of equivalence relation entourages. In a nonarchimedean uniformity, this pseudometric system induces the uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23111	merge-conflict t-topology	509/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	9	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	urkud assignee:urkud	180-75854 5 months ago	180-75855 180 days ago	177-43034 177 days
25324	eric-wieser author:eric-wieser	feat: more functorial results about DFinsupp	We have these already for Finsupp. The `DFinsupp` statements need some extra casts in some places. --- - [ ] depends on: #27182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [#mathlib4 > Equiv.cast for structures @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Equiv.2Ecast.20for.20structures/near/521390935)	merge-conflict awaiting-author t-algebra t-data label:t-algebra$	137/16	Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean	2	13	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	pechersky assignee:pechersky	180-75849 5 months ago	231-9720 231 days ago	19-26510 19 days
25585	Paul-Lez author:Paul-Lez	feat(Tactic/Linters/DeprecatedSimpLemma): lint for deprecated simp lemmas	The deprecated simp lemma linter flags declarations that have both the `deprecated` and `simp` attributes. See Zulip discussion: [#mathlib4 > Help with Mathlib.Order.Interval.Finset.Defs @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Help.20with.20Mathlib.2EOrder.2EInterval.2EFinset.2EDefs/near/505994843) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author	105/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedSimpLemma.lean,MathlibTest/DeprecatedSimpLemmaTest.lean	4	8	['adomani', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	180-75722 5 months ago	344-61417 344 days ago	0-87 1 minute
26648	eric-wieser author:eric-wieser	chore(TensorProduct): remove more `suppress_compilation`s	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-core-PR t-algebra label:t-algebra$	3/7	Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean	3	5	['eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	180-75355 5 months ago	316-77390 316 days ago	3-19989 3 days
28316	eric-wieser author:eric-wieser	feat(Tactic/NormNum): better trace nodes	Comparing the infoview on the first example in the test file \| Before \| After \| \|---\|---\| \| \| \| In the after version, the extension names are all clickable. Similar to #21450. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-meta	136/5	Mathlib.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Util/Trace.lean,MathlibTest/norm_num_trace.lean	4	20	['JovanGerb', 'eric-wieser', 'github-actions', 'kmill', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'plp127']	JovanGerb assignee:JovanGerb	180-75021 5 months ago	263-31908 263 days ago	15-76174 15 days
6268	eric-wieser author:eric-wieser	fix: fixups to #3838	This is an attempt to make #3838 universe polymorphic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) * Depends on #6271 * Depends on #8876	merge-conflict WIP	186/107	Mathlib/Control/Random.lean,Mathlib/Tactic/SlimCheck.lean,Mathlib/Testing/SlimCheck/Functions.lean,Mathlib/Testing/SlimCheck/Gen.lean,Mathlib/Testing/SlimCheck/Sampleable.lean,Mathlib/Testing/SlimCheck/Testable.lean,test/slim_check.lean	7	10	['github-actions', 'kim-em']	nobody	180-48198 5 months ago	unknown	0-0 0 seconds
6859	MohanadAhmed author:MohanadAhmed	feat: TryLean4Bundle: Windows Bundle Creator	# `TryLean4Bundle`: Windows Bundle Creator A Windows batch script and a CI yml file that create an self extracting archive. The user should 1. just download the archive, 2. double click the archive to expand 3. double click the `RunLean.bat` script in the expanded archive. The script currently downloads 7 dependencies into CI then unpacks them in the appropriate locations and finally packs them back. To try a bundle created using these scripts but from a different repo see (https://github.com/MohanadAhmed/TryLean4Bundle/releases) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP help-wanted CI	114/0	.github/workflows/mk_windows_bundle.yml,scripts/windowsBundle.bat	2	0	[]	nobody	180-48190 5 months ago	993-16903 993 days ago	0-434 7 minutes
6993	jjaassoonn author:jjaassoonn	feat: lemmas about `AddMonoidAlgebra.{divOf, modOf}`	--- - [x] depends on: #7582 - [x] depends on: #8975 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	147/3	Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/MvPolynomial/CommRing.lean,Mathlib/Data/MvPolynomial/Division.lean	5	42	['YaelDillies', 'alreadydone', 'digama0', 'eric-wieser', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48185 5 months ago	850-52938 850 days ago	103-330 103 days
7427	MohanadAhmed author:MohanadAhmed	feat: eigenvalues sorted in ascending/descending order	In the file `Analysis.InnerProductSpace.Spectrum` todo notes were left saying: > TODO Postcompose with a permutation so that these eigenvectors are listed in increasing order of eigenvalue. > TODO Postcompose with a permutation so that these eigenvalues are listed in increasing order. - This is a start in that direction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	162/4	Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiLp.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean	3	0	[]	nobody	180-48153 5 months ago	unknown	0-0 0 seconds
9339	FMLJohn author:FMLJohn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): given a finitely generated homogeneous ideal of a graded semiring, construct a finite spanning set for the ideal which only contains homogeneous elements	--- - [ ] depends on: #8187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	402/4	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Module/GradeZeroModule.lean,Mathlib/RingTheory/Finiteness.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousIdeal.lean,Mathlib/RingTheory/GradedAlgebra/Noetherian.lean	8	11	['FMLJohn', 'github-actions', 'jjaassoonn', 'leanprover-community-mathlib4-bot']	nobody	180-48138 5 months ago	864-53116 864 days ago	6-63597 6 days
9564	AntoineChambert-Loir author:AntoineChambert-Loir	chore: weaken commutativity assumptions for AdjoinRoot.lift and AdjoinRoot.liftHom	I weaken a commutativity assumption for docs#AdjoinRoot.liftHom that the target algebra be commutative. It is only assumed to be a Semiring. For that, I need to generalize docs#AdjoinRoot.lift which takes `i : R ->+* S`, `a : S` with `f.eval₂ i a = 0` and defines `AdjoinRoot f ->+* S` that extends `i ` and sends `AdjoinRoot.root f` to `a`. --- The initial version of the PR was to define `AdjoinRoot.lift'` where `S` is only a Semiring, with the additional assumption `hcomm : ∀ r, Commute (i r) a` that the element `a` commutes with the image of `i`. @jcommelin suggested to provide this argument as an `autoParam`, filled in by an ad hoc `commutativity` tactic. However, such an argument cannot be made implicit and a first version required to have this argument given each time, most of the time by `_`, even for all subsequent lemmas, `AdjoinRoot.lift_mk`, etc. To avoid this, I tried to make this assumption a `⦃hcomm : ∀ r, Commute (i r) a⦄`. This appears to have some side effects that proofs using an `exact` tactic or in term mode do not work well, but one can resort on `by simp […]`. Maybe @eric-wieser or @Vierkantor will have opinions on that. In some cases one can still give the argument as `(hcomm := by commutativity)`. (There are 3 options : - separate lemmas for the fully commutative case and for the case where a proof is needed - using the `commutativity` tactic, but with an argument `_` sometimes - using the optional argument.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	146/30	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Commutativity.lean,Mathlib/Tactic/Commutativity/Init.lean	8	14	['AntoineChambert-Loir', 'Vierkantor', 'eric-wieser', 'jcommelin']	nobody	180-48132 5 months ago	777-40438 777 days ago	16-71959 16 days
10026	madvorak author:madvorak	feat: linear programming according to Antoine Chambert-Loir's book	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	10	['eric-wieser', 'madvorak', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	180-48126 5 months ago	684-70935 684 days ago	154-48765 154 days
10159	madvorak author:madvorak	feat: linear programming according to Antoine Chambert-Loir's book — affine version	--- Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.237386.20Linear.20Programming Four PRs incompatible with each other: https://github.com/leanprover-community/mathlib4/pull/7386 (list of constraints) https://github.com/leanprover-community/mathlib4/pull/9693 (matrix form) https://github.com/leanprover-community/mathlib4/pull/10026 (Antoine Chambert-Loir's def; semirings, linear) https://github.com/leanprover-community/mathlib4/pull/10159 (Antoine Chambert-Loir's def; rings, affine) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra RFC label:t-algebra$	83/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	8	['eric-wieser', 'madvorak', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	nobody	180-48119 5 months ago	684-70918 684 days ago	152-72231 152 days
10349	Shamrock-Frost author:Shamrock-Frost	refactor(CategoryTheory/MorphismProperty): some clean-ups	We make explicit some of the galois connections/closure operators in the existing MorphismProperty file, rewrite some proofs to take advantage of these structures, and change map/inverseImage by (1) swapping their argument order, for consistency with Set.range and Set.preimage and (2) making "map" perform the strict, evil map while "essMap" (previously called map) forms the closure of the image under isomorphisms. Finally we add `IsMultiplicative` instances for isos/epis/monos, with an eye towards constructing the wide subcategory on these classes of maps. --- - [x] depends on: #10347 - [x] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-category-theory	474/318	Mathlib/CategoryTheory/Localization/Composition.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean,Mathlib/CategoryTheory/MorphismProperty.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Closure.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/RelIso/Basic.lean	8	1	['leanprover-community-mathlib4-bot']	nobody	180-48096 5 months ago	831-16840 831 days ago	0-418 6 minutes
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-topology new-contributor	2137/1	.gitignore,Mathlib.lean,Mathlib/AlgebraicTopology/Join.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplexCategoryWithInitial.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	6	47	['github-actions', 'jcommelin']	nobody	180-48088 5 months ago	810-15533 810 days ago	1-20227 1 day
11800	JADekker author:JADekker	feat: KappaLindelöf spaces	Define KappaLindelöf spaces by following the first one-third of the API for Lindelöf spaces. The remainder will be added in a future PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology awaiting-zulip	301/2	Mathlib.lean,Mathlib/Topology/Compactness/KappaLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	3	38	['ADedecker', 'JADekker', 'PatrickMassot', 'StevenClontz', 'adomani', 'github-actions', 'grunweg', 'kim-em', 'urkud']	nobody	180-48054 5 months ago	655-68336 655 days ago	123-25636 123 days
12087	JADekker author:JADekker	feat: complete API for K-Lindelöf spaces	--- - [ ] depends on: #11800 (which is now awaiting a design decision) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict t-topology blocked-by-other-PR	789/17	Mathlib.lean,Mathlib/Order/Filter/CardinalInter.lean,Mathlib/Topology/Compactness/KLindelof.lean,Mathlib/Topology/Compactness/Lindelof.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	180-48047 5 months ago	655-68211 655 days ago	99-11243 99 days
12251	ScottCarnahan author:ScottCarnahan	refactor(RingTheory/HahnSeries): several generalizations	This PR is a container for several smaller PRs that refactor and generalize the existing Hahn series theory. It is (I think) all we need from Hahn series to get a palatable theory of vertex algebras off the ground (other prerequisites from Lie algebras will eventually come in a different PR). Major changes include: - equivalence between iterated Hahn series and Hahn series on Lex products. - introduce `orderTop` and `leadingCoeff` functions. Here, `orderTop` is a `WithTop Γ`-valued version of `order` that does not need `[Zero Γ]` and `leadingCoeff` returns the coefficient of the minimal element of support (or zero if empty). - introduce ordered and cancellative vector addition classes together with some basic theory e.g., finiteness of antidiagonals for partially well-ordered sets. - `HahnSeries Γ R`-module structure on `HahnModule Γ' R V`, when `Γ` is an `OrderedCancelAddCommMonoid`, `Γ'` is a `PartialOrder` with `OrderedCancelVAdd Γ Γ'`, `R` is a semiring, and `V` is an `R`-module. - Move `AddVal` to a separate file - the underlying function is just `orderTop`, but the description of the valuation needs an additional import and an `IsDomain` hypothesis. Results that depended on `AddVal` are changed to use `orderTop` and generalized. --- - [x] depends on: #10781 [HahnSeries on Lex product] - [x] depends on: #10846 [HahnModule] - [x] depends on: #11965 [orderTop] - [x] depends on: #11979 [OrderedVAdd] - [x] depends on: #12996 [leadingTerm] - [x] depends on: #16649 - [x] depends on: #16701 - [x] depends on: #17004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra t-order label:t-algebra$	1059/97	Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-48032 5 months ago	666-14179 666 days ago	42-37118 42 days
12394	JADekker author:JADekker	feat: define pre-tight and tight measures	Define tight measures (by first defining separable and pre-tight measures). Define some api for all three concepts Prove Ulam's tightness theorem and a strengthened version of this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt merge-conflict awaiting-author t-measure-probability	503/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean	2	34	['EtienneC30', 'JADekker', 'github-actions', 'sgouezel']	nobody	180-48027 5 months ago	742-56078 742 days ago	2-24297 2 days
12452	JADekker author:JADekker	feat(Cocardinal): add some more api	Just a small PR to add a bit more API for cocardinal filters. Not everything seems to generalise nicely from cofinite, so I didn't include such results. Currently the file has one `sorry`, I'm not sure how to complete this proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-CI	75/0	Mathlib/Order/Filter/Cocardinal.lean	1	0	[]	nobody	180-48023 5 months ago	752-44303 752 days ago	0-2075 34 minutes
14426	adomani author:adomani	feat: `#min_imps` command (development branch)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	142/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MinImports.lean,test/MinImports.lean	4	2	['adomani', 'github-actions']	nobody	180-47994 5 months ago	683-27475 683 days ago	0-31 31 seconds
14686	smorel394 author:smorel394	feat(AlgebraicGeometry/Grassmannian): define the Grassmannian scheme	# The Grassmannian scheme Define the Grassmannian scheme by gluing affine charts. We fix a commutative ring `K`, a free `K`-module of finite type `V` and two natural numbers `r` and `c`. The scheme we define should parametrize surjective `K`-linear maps `V →ₗ[K] (Fin r → K)`, assuming that `V` is of rank `r + c`. We actually define the scheme without assuming the condition on the rank of `V`, but it is empty unless the rank of `V` is `r + c`. Main definitions: * `Grassmannian.glueData K V r c`: the `AlgebraicGeometry.Scheme.GlueData` defining the Grassmannian scheme. * `Grassmannian K V r c`: the Grassmannian scheme, defined as `(Grassmannian.glueData K V r c).glued`. * `Grassmannian.structMorphism K V r c`: the structural morphism from `Grassmannian K V r c` to `Spec K`. # Implementation We use as index type for the charts the type `Basis (Fin (r + c)) K V` (so this is empty unless `V` is free of rank `r + c`). All the charts are the same and equal to the affine space with coordinates indexed by `Fin c × Fin r`, that is, to `Spec (MvPolynomial (Fin c × Fin r) K)`. The idea is that, for `i` in `Basis (Fin (r + c)) K V`, the corresponding chart will parametrize all surjective `K`-linear maps `φ : V →ₗ[K] (Fin r → K)` that become isomorphisms when restricted to the `K`-submodule generated by the first `r` vectors of the basis `i`. To get the point of the chart corresponding to `φ`, we take the matrix of `φ` in the basis `i` of `V` and the canonical basis of `Fin r → K`, we divide it on the right by its top `r × r` square submatrix (which is invertible by assumption), and we taken the botton `c × r` submatrix. This is almost the usual description of the Grassmannian by charts, with three differences: * We consider the Grassmannian parametrizing `r`-dimensional quotients of `V` instead of `r`-dimensional subspaces of `V`, because this is more natural when working over a general ring (or scheme). * In the usual description, we fix a basis of `V` and index the chart by its subsets `I` of cardinality `r`. Here, to avoid making a choice, we instead index charts by the set of bases of `V` and always choose the subset `I` to consist of the first `r` vectors. * Instead of working with `FiniteDimensional.finrank K V - r`, which would cause technical trouble because of the way subtraction works on `ℕ`, we introduce the codimension `c` as an auxiliary variable, and our constructions are only interesting when `r + c` is equal to `FiniteDimensional.finrank K V`. # Why is this a WIP * There a bunch of lemmas in the file `AlgebraicGeometry/Grassmannian/Lemmas.lean` that either should not be necessary or should be put in another PR for some other part of mathlib. * The proofs in `AlgebraicGeometry/Grassmannian/Basic.lean` are probably too complicated, and the names suck. # Notes. This contribution was created as part of the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #14711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP workshop-AIM-AG-2024 merge-conflict t-algebraic-geometry	1002/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Grassmannian/Basic.lean,Mathlib/AlgebraicGeometry/Grassmannian/Lemmas.lean	3	15	['erdOne', 'github-actions', 'joelriou', 'leanprover-community-mathlib4-bot', 'smorel394']	nobody	180-47983 5 months ago	675-33990 675 days ago	0-201 3 minutes
17071	ScottCarnahan author:ScottCarnahan	feat(LinearAlgebra/RootSystem): separation, base, cartanMatrix	This PR defines an abstract separation structure for roots, together with the associated base and Cartan Matrix. In general, the good properties will follow from additional order hypotheses on the base ring (implemented in a future PR). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	111/0	Mathlib.lean,Mathlib/LinearAlgebra/RootSystem/Separation.lean	2	1	['github-actions']	nobody	180-47948 5 months ago	581-38408 581 days ago	20-56416 20 days
17471	joelriou author:joelriou	feat(Algebra/ModuleCat/Differentials/Sheaf): the sheaf of relative differentials	--- - [ ] depends on: #17366 - [x] depends on: #17388 - [x] depends on: #16755 - [ ] depends on: #17469 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR t-category-theory large-import merge-conflict t-algebraic-geometry	740/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/AlgebraicGeometry/Modules/Differentials.lean,Mathlib/Geometry/RingedSpace/SheafedSpace.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-47941 5 months ago	unknown	0-0 0 seconds
18626	hannahfechtner author:hannahfechtner	feat: define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra new-contributor label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	180-47935 5 months ago	543-54814 543 days ago	15-38478 15 days
18784	erdOne author:erdOne	feat(AlgebraicGeometry): use `addMorphismPropertyInstances`	--- - [ ] depends on: #18785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-geometry blocked-by-other-PR	435/91	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/AlgebraicGeometry/Morphisms/Affine.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/FinitePresentation.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/AlgebraicGeometry/Morphisms/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/CategoryTheory/MorphismProperty/Composition.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Tactic.lean,MathlibTest/AddMorphismPropertyInstances.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	180-47926 5 months ago	555-71131 555 days ago	0-1869 31 minutes
19062	hannahfechtner author:hannahfechtner	feat(Algebra/PresentedMonoid/Basic): facts about rel	Add in a number of useful theorems (reflexivity, closure under multiplication) and lemmas about when the PresentedMonoid.rel holds as an API for users --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-algebra label:t-algebra$	38/0	Mathlib/GroupTheory/Congruence/Defs.lean	1	8	['github-actions', 'hannahfechtner', 'kbuzzard', 'riccardobrasca']	nobody	180-47921 5 months ago	447-58881 447 days ago	87-64575 87 days
19607	madvorak author:madvorak	feat: block matrices are totally unimodular	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/TU.20block.20matrix.20.2319607 - [ ] depends on: #19323 - [ ] depends on: #20428 - [ ] depends on: #20433 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR	156/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean,Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean	3	11	['github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot']	nobody	180-47911 5 months ago	unknown	0-0 0 seconds
20029	FrederickPu author:FrederickPu	feat(Tactic/simps): allow for Config attributes to be set directly	Allow for Config attributes to be set directly when using initialize_simp_projection as per issue #19895 Basically modified initialize_simp_projection so that the user has the option of specifying a tuple of config option values. Ex: ``` initialize_simp_projection MulEquiv (toFun → apply, invFun → symm_apply) (fullyApplied := false) ``` These config options are then converted into projections. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP new-contributor t-meta	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	180-47872 5 months ago	516-65121 516 days ago	0-34081 9 hours
21269	658060 author:658060	feat(CategoryTheory/Topos): basic definitions and results in topos theory	This code contains basic definitions and results in topos theory, including the definition of a subobject classifier, power objects, and topoi. It is proved that every topos has exponential objects, i.e. "internal homs". The mathematical content follows chapter IV sections 1-2 of Mac Lane and Moerdijk's text "Sheaves in Geometry and Logic". --- - [x] depends on: #21281 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory new-contributor merge-conflict awaiting-author	1269/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Basic.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/CategoryTheory/Topos/Exponentials.lean,Mathlib/CategoryTheory/Topos/Power.lean	5	10	['658060', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	180-47845 5 months ago	473-26659 473 days ago	0-13879 3 hours
22805	ScottCarnahan author:ScottCarnahan	feat(FieldTheory/Finite): fixed points of Frobenius automorphism	This PR identifies the prime field with the fixed points of frobenius. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra label:t-algebra$	325/7	Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean	4	1	['github-actions']	nobody	180-47833 5 months ago	unknown	0-0 0 seconds
23990	robertmaxton42 author:robertmaxton42	feat(Types.Colimits): Quot is functorial and colimitEquivQuot is natural	Add `Functor.quotFunctor` to parallel `Functor.sectionsFunctor`, witnessing that `Quot` is functorial; add `colimNatIsoQuotFunctor` to parallel `limNatIsoSectionsFunctor`, witnessing that `colimitEquivQuot` is natural in the diagram $F$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-category-theory new-contributor	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	180-47728 5 months ago	392-46663 392 days ago	8-27136 8 days
24533	robertmaxton42 author:robertmaxton42	feat(ULift): conjugation by ULift.up/down, misc cast/heq lemmas	* Adds the convenience def `ULift.conj x := `down (f (up x))`, and corresponding basic lemmas * Adds lemmas showing that `ULift.up` and `.down` commute with casts and preserve `HEq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data	31/0	Mathlib/Data/ULift.lean	1	23	['eric-wieser', 'github-actions', 'grunweg', 'robertmaxton42']	nobody	180-47724 5 months ago	263-75512 263 days ago	118-2181 118 days
24690	ScottCarnahan author:ScottCarnahan	feat(Data.Prod): reverse lexicographic order	This PR implements the type synonym RevLex as a one-field structure, defines an order on products, and proves an order isomorphism with the Lex product with factors switched. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	141/0	Mathlib.lean,Mathlib/Data/Prod/RevLex.lean	2	5	['ScottCarnahan', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47714 5 months ago	356-6839 356 days ago	19-33859 19 days
24692	ScottCarnahan author:ScottCarnahan	feat(RingTheory/HahnSeries/Basic): isomorphism of Hahn series induced by order isomorphism	This PR introduces an isomorphism of Hahn series induced by an order isomorphism on the exponent posets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-order	35/0	Mathlib/RingTheory/HahnSeries/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	180-47708 5 months ago	343-78163 343 days ago	31-47622 31 days
25034	ScottCarnahan author:ScottCarnahan	feat(Algebra/Module/Equiv/Basic): Restriction of scalars from a semilinear equivalence to a linear equivalence	If `M` and `M₂` are both `R`-modules and modules for `S` and `S₂`, respectively, then for any ring isomorphism `e` between `S` and `S₂` and any `e`-semilinear equivalence between `M` and `M₂` that respects the `R`-action, we obtain an `R`-linear equivalence between `M` and `M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	28/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	1	['github-actions']	nobody	180-47701 5 months ago	343-78125 343 days ago	20-11468 20 days
24627	pechersky author:pechersky	feat(Topology/Algebra/Valued): `IsLinearTopology 𝒪[K] K` and `𝒪[K] 𝒪[K]`	as well as `IsLinearTopology ℤ_[p] ℤ_[p]` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26829	merge-conflict awaiting-author t-topology	219/26	Mathlib.lean,Mathlib/NumberTheory/Padics/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/LinearTopology.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean	5	55	['ADedecker', 'erdOne', 'faenuccio', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	jcommelin assignee:jcommelin	175-60466 5 months ago	180-75862 180 days ago	36-378 36 days
24016	plp127 author:plp127	feat: fine uniformity	Adds the fine uniformity, and proves some properties. --- - [ ] depends on: #24096 for showing the induced topology is equal on completely regular spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology	283/0	Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	175-7855 5 months ago	397-16605 397 days ago	2-85308 2 days
24514	b-mehta author:b-mehta	chore(Int/GCD): use fuel in xgcd	Modify the definition of xgcd to use fuel recursion, to allow it to be reduced in the kernel. As a consequence, this means the evaluation of field operations in ZMod p become provable by `rfl` and `decide`. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/opaque.20recursion.20definitions.20break.20mergeSort.20decidability --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-data merge-conflict	44/22	Mathlib/Data/Int/GCD.lean	1	6	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'nomeata', 'urkud']	nobody	172-63274 5 months ago	324-16752 324 days ago	58-34020 58 days
24441	MrSumato author:MrSumato	feat(Data/List): add Lyndon-Schutzenberger theorem on list commutativity	Add Lyndon-Schutzenberger theorem on list commutativity. Included definition for List.repeatSelf that returns list repeated n times. --- This is my first mathlib PR, so any comments are highly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-data new-contributor	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	38	['MrSumato', 'github-actions', 'grunweg', 'madvorak', 'mathlib4-merge-conflict-bot', 'plp127']	grunweg assignee:grunweg	164-30375 5 months ago	346-56719 346 days ago	29-59355 29 days
32473	mattrobball author:mattrobball	chore(Kaehler.JacobiZariski): remove egregious local instance hack	This code looks terrible and is no longer strictly necessary. Local timings give `lake build Mathlib/RingTheory/Kaehler/JacobiZariski.lean 39.77s user 1.07s system 263% cpu 15.482 total` after removal and `lake build Mathlib/RingTheory/Kaehler/JacobiZariski.lean 36.93s user 1.01s system 251% cpu 15.113 total` before the removal. So the preformance impact of removal is small. One could argue that keeping is a remainder that everything here needs to be seriously changed but the miminmal performance difference suggests that these local instances would be a red herring in that regard. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author merge-conflict	0/4	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	14	['chrisflav', 'erdOne', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'mattrobball']	nobody	163-53998 5 months ago	163-53998 163 days ago	1-301 1 day
23040	grunweg author:grunweg	feat: define immersions and smooth embeddings in infinite dimensions	Sadly, we cannot prove most nice things about them yet, as we don't have the inverse function theorem yet. TODO: prove the few things we can already say --- - [ ] depends on: #28796 - [x] depends on: #28853 - [x] depends on: #23175 (preliminaries) - [x] depends on: #23186 - [ ] depends on: another PR, about `MSplitAt` (to be filed) - and perhaps some prerequisites about products of complemented modules etc. - [x] depends on: #23219 (preliminaries about local diffeomorphisms) - [x] depends on: #8738 - in fact, #9273 is not a strict pre-requisite for this. It suffices to know "extended charts have invertible differentials", which [isInvertible_mfderiv_extChartAt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/MFDeriv/Atlas.html#isInvertible_mfderiv_extChartAt) mostly proves. (There's nothing wrong with completing that PR, for all interior points.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	967/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean	5	4	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	159-55765 5 months ago	unknown	0-0 0 seconds
6633	adomani author:adomani	feat(..Polynomial..): `MvPolynomial`s have no zero divisors	This PR continues #6627, placing the `NoZeroDivisors` instance on `MvPolynomial`s and removing auxiliary intermediate results that are no longer needed. Affected files: ``` Data/MvPolynomial/Basic.lean Data/Polynomial/RingDivision.lean RingTheory/Polynomial/Basic.lean ``` --- - [x] depends on: #6227 for the `NoZeroDivisors` instance on `AddMonoidAlgebra`s [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebra label:t-algebra$	143/57	Mathlib/Algebra/MonoidAlgebra/NoZeroDivisors.lean,Mathlib/Data/MvPolynomial/Basic.lean,Mathlib/Data/Polynomial/RingDivision.lean,Mathlib/RingTheory/Polynomial/Basic.lean	4	6	['SnirBroshi', 'YaelDillies', 'adomani', 'eric-wieser']	nobody	158-49535 5 months ago	1005-33877 1005 days ago	0-19485 5 hours
21447	erdOne author:erdOne	feat(AlgebraicGeometry): the split algebraic torus	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-algebraic-geometry	419/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Torus.lean	2	6	['erdOne', 'github-actions', 'jcommelin', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	151-73700 5 months ago	465-25870 465 days ago	2-69252 2 days
21495	alreadydone author:alreadydone	experiment: reducible HasQuotient.quotient'	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	2/0	Mathlib/Algebra/Quotient.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	150-38097 4 months ago	466-60927 466 days ago	0-200 3 minutes
5934	eric-wieser author:eric-wieser	feat: port Data.Rat.MetaDefs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This needs some eyes from people familiar with Qq	merge-conflict help-wanted mathlib-port t-meta	183/0	Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean	3	5	['eric-wieser', 'gebner', 'vihdzp']	nobody	143-35516 4 months ago	unknown	0-0 0 seconds
4960	eric-wieser author:eric-wieser	chore: use `open scoped`	Earlier versions of mathport did not know about this. This was done by searching for all `open` commands referencing: * `Classical` * `BigOperators` * `Topology` * `Pointwise` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI	1026/981	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/NatAntidiagonal.lean,Mathlib/Algebra/BigOperators/Option.lean,Mathlib/Algebra/BigOperators/Order.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/Bounds.lean,Mathlib/Algebra/Category/GroupCat/Biproducts.lean,Mathlib/Algebra/Category/GroupCat/FilteredColimits.lean,Mathlib/Algebra/Category/GroupCat/Injective.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/Mon/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Div.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Commute.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Homology.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/Module/GradedModule.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/PointwisePi.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Pointwise.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/SMul.lean,Mathlib/Algebra/Order/UpperLower.lean,Mathlib/Algebra/Periodic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/GroupRingAction.lean,Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Support.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/PrimeSpectrum/Maximal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Tagged.lean,Mathlib/Analysis/Calculus/ContDiffDef.lean,Mathlib/Analysis/Calculus/Deriv/Add.lean	788	1	['vihdzp']	nobody	143-35413 4 months ago	1073-20143 1073 days ago	0-753 12 minutes
4127	kmill author:kmill	refactor: create HasAdj class, define Digraph, and generalize some SimpleGraph API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-combinatorics	1403/551	Mathlib.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/Graph/Classes.lean,Mathlib/Combinatorics/Graph/Dart.lean,Mathlib/Combinatorics/Graph/Hom.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean,Mathlib/Combinatorics/SimpleGraph/Finsubgraph.lean,Mathlib/Combinatorics/SimpleGraph/Hasse.lean,Mathlib/Combinatorics/SimpleGraph/Prod.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	18	2	['SnirBroshi', 'vihdzp']	nobody	143-31388 4 months ago	1086-51229 1086 days ago	8-43930 8 days
25481	kbuzzard author:kbuzzard	chore: refactor Algebra.TensorProduct.rightAlgebra	The declaration `Algebra.TensorProduct.rightAlgebra` makes `A ⊗[R] B` into a `B`-algebra (here `R` is a `CommSemiring`, `A` is a `Semiring` and an `R`-algebra, and `B` is a `CommSemiring` and an `R`-algebra). It is not an instance because if A = B it causes a diamond. However in the many cases where A isn't B, it can occasionally be useful. However one could imagine that in the many cases where an R-module `M` also isn't `B`, it might occasionally be useful to make `M ⊗[R] B` into a `B`-module (and indeed I am finding this in FLT). With the current definition of `Algebra.TensorProduct.rightAlgebra` this is difficult to do without causing diamonds in the case when `M` happens to be an `R`-algebra (by which I mean "I failed to do this in finite time"). One fix for this is just to redefine `Algebra.TensorProduct.rightAlgebra` so that the `smul` field is ``` smul b ab := TensorProduct.comm _ _ _ (b • (TensorProduct.comm _ _ _ ab)) ``` i.e. literally "swap the product around, use mathlib's instance making `B ⊗[R] A` into a `B`-algebra, and then swap back". Then the same definition can be used to make `M ⊗[R] B` into a `B`-module and on the odd occasion where this point of view is useful, there is no diamond. This is what we do in this PR. After adding one simp lemma there is no breakage at all in mathlib. Furthermore, for those who have observed that we want to build on this algebra instance sometimes and, for example, add instances of the form "if M is finite over R then M ⊗[R] B is finite over B" -- these instances are really easy to add now with this new definition, because you simply pull back the analogous finite left module instance along the isomorphism M ⊗[R] B = B ⊗[R] M. Examples (from FLT, where the right action is put in a scope): ``` scoped instance [Module.Finite R M] : Module.Finite A (M ⊗[R] A) := Module.Finite.equiv (Module.TensorProduct.comm R A M) scoped instance [Module.Free R M] : Module.Free A (M ⊗[R] A) := Module.Free.of_equiv (Module.TensorProduct.comm R A M) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	10	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	141-46633 4 months ago	290-55784 290 days ago	56-85391 56 days
14444	digama0 author:digama0	fix(GeneralizeProofs): unreachable! bug	As [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Unreachable.20code.20reached.20in.20Lean.204.2E8.2E0/near/449286780). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	1/1	Mathlib/Tactic/GeneralizeProofs.lean	1	6	['github-actions', 'jcommelin', 'kmill', 'mathlib4-merge-conflict-bot', 'plby']	nobody	141-9804 4 months ago	672-25208 672 days ago	10-36842 10 days
25138	chrisflav author:chrisflav	chore(RingTheory/Ideal): make `RingHom.ker` take a `RingHom` instead of `RingHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author merge-conflict label:t-algebra$	317/309	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Weierstrass.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/FieldTheory/PurelyInseparable/Tower.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/Adjoin/Tower.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/Etale/Kaehler.lean,Mathlib/RingTheory/Extension/Cotangent/Basis.lean,Mathlib/RingTheory/Extension/Cotangent/LocalizationAway.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteStability.lean,Mathlib/RingTheory/Finiteness/NilpotentKer.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/IsAdjoinRoot.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Nullstellensatz.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/UniqueFactorization.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/AdicCompletion.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Flat.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	68	8	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	140-83612 4 months ago	360-14740 360 days ago	0-3642 1 hour
24665	Komyyy author:Komyyy	feat(Mathlib/Topology/Metrizable/Uniformity): every uniform space is generated by a family of pseudometrics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-topology merge-conflict	54/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	139-26336 4 months ago	376-33278 376 days ago	0-1 1 second
33462	eric-wieser author:eric-wieser	feat: teach `fun_prop` about `ContinousMultilinearMap.compContinuousLinearMap`	For now I've omitted the curried version --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	46/0	Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean	1	3	['github-actions', 'sgouezel']	nobody	137-27570 4 months ago	137-40808 137 days ago	137-40800 137 days
25500	eric-wieser author:eric-wieser	feat: delaborators for metadata	Being able to see these is very important when debugging tactic failures. Probably these could be upstreamed, but I don't think that's a reason not to merge them here first. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict awaiting-author delegated t-meta	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	19	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	136-12227 4 months ago	263-42740 263 days ago	83-68773 83 days
21344	kbuzzard author:kbuzzard	chore: attempt to avoid diamond in OreLocalization	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt t-algebra label:t-algebra$	16/5	Mathlib/RingTheory/OreLocalization/Basic.lean	1	6	['erdOne', 'github-actions', 'kbuzzard']	nobody	134-24204 4 months ago	469-21899 469 days ago	1-35979 1 day
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author new-contributor t-measure-probability please-adopt	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	32	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	133-31619 4 months ago	580-78856 580 days ago	9-73631 9 days
24010	grunweg author:grunweg	feat(Counterexamples): a non-negative function, not a.e. zero, with vanishing lowe…	…r Lebesgue integral. Came up in #23707, let's document this while we're at it. --- - [ ] depends on: #20722 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict please-adopt WIP blocked-by-other-PR t-measure-probability	110/0	Counterexamples.lean,Counterexamples/LIntegralZero.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	130-56249 4 months ago	400-31294 400 days ago	0-22 22 seconds
33669	eric-wieser author:eric-wieser	chore(Data/Nat/Digits): refactor to use List.rightpad	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	32/12	Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Digits/Lemmas.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot', 'xroblot']	nobody	128-73974 4 months ago	132-42664 132 days ago	0-237 3 minutes
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	2	['urkud']	nobody	127-2020 4 months ago	711-62488 711 days ago	9-15083 9 days
12934	grunweg author:grunweg	chore: replace more uses of > or ≥ by < or ≤	These were flagged by the linter in https://github.com/leanprover-community/mathlib4/pull/12879: it is easy to simple avoid > or ≥ in hypotheses or haves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author help-wanted	41/42	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Tactic/Linarith/Datatypes.lean,test/cancel_denoms.lean,test/congr.lean,test/interval_cases.lean,test/observe.lean	15	12	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	127-1927 4 months ago	731-57752 731 days ago	1-73101 1 day
20719	gio256 author:gio256	feat(AlgebraicTopology): delaborators for truncated simplicial notations	We add delaborators for the following notations, introduced in #20688: - `⦋m⦌ₙ`, which denotes the `m`-dimensional simplex in the `n`-truncated simplex category. - `X _⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated simplicial object `X`. - `X ^⦋m⦌ₙ`, which denotes the `m`-th term of an `n`-truncated cosimplicial object `X`. If `pp.proofs` is set to `true`, we also pretty-print the proof `p : m ≤ n` for all three notations as `⦋m, p⦌ₙ`, `X _⦋m, p⦌ₙ`, and `X ^⦋m, p⦌ₙ`, respectively. Credit to @kmill for one piece of code and much metaprogramming inspiration. --- - [x] depends on: #20688 - [x] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology infinity-cosmos t-meta please-adopt will-close-soon	525/33	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialObject/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SimplexCategory.lean,Mathlib/Util/Superscript.lean,MathlibTest/SimplexCategory.lean,MathlibTest/SimplicialObject.lean,MathlibTest/superscript.lean,scripts/noshake.json	11	24	['eric-wieser', 'gio256', 'github-actions', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	122-51278 4 months ago	302-28418 302 days ago	88-84229 88 days
31348	PatrickMassot author:PatrickMassot	chore: fix a docstring typo	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation awaiting-author t-analysis	1/1	Mathlib/Analysis/Calculus/Darboux.lean	1	3	['ADedecker', 'dopamine333', 'github-actions']	nobody	122-47221 4 months ago	192-53693 192 days ago	0-21655 6 hours
10991	thorimur author:thorimur	feat: `tfae` block tactic	This PR introduces `tfae` block tactic syntax: ```lean tfae 1 → 2 := /- proof of `P₁ → P₂` -/ 2 → 3 := /- proof of `P₂ → P₃` -/ 3 → 1 := /- proof of `P₃ → P₁` -/ ``` Like the recent change to `tfae_have`, this syntax also supports all sorts of matching that `have` itself supports: ```lean tfae 2 → 3 \| h₂ => /- proof of `P₃` -/ 3 → 1 -- given `P₁ := ∀(a : A), (b : B), (c : C), X`: \| h₃, a, b, c => /- proof of `X` -/ ⟨h_mp, h_mpr⟩ : 1 ↔ 2 := /- proof of `P₁ ↔ P₂`; puts `h_mp : P₁ → P₂`, `h_mpr : P₂ → P₁` in the lctx -/ ``` This initial implementation is currently very simple, and relies on `tfae_have` and `tfae_finish`. Although we intend to migrate away from that syntax, this PR does not remove support for it or deprecate `tfae_have`/`tfae_finish` in any way; migration (but not deprecation) is done in #11003. --- - [x] depends on: #10653 - [x] depends on: #10994 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP modifies-tactic-syntax t-meta	392/124	Mathlib/Tactic/TFAE.lean,scripts/noshake.json,test/tfae.lean	3	5	['github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'thorimur']	joneugster assignee:joneugster	122-37151 4 months ago	606-1020 606 days ago	7-13967 7 days
34195	eric-wieser author:eric-wieser	feat: continuous bundled actions	These are `Continuous` versions of existing definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-algebra large-import label:t-algebra$	59/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	117-72702 3 months ago	61-32827 61 days ago	0-1929 32 minutes
21476	grunweg author:grunweg	feat(lint-style): enable running on downstream projects	Enable lint-style to run on downstream projects, by making the following modifications: - allow passing an explicit list of libraries to lint: if nothing is passed, it lints `Mathlib`, `Archive` and `Counterexamples` (as before); otherwise, it lints precisely the passed modules - only check init imports, undocumented scripts and the errors from `lint-style.py` when linting Mathlib - make the style exceptions file configurable and optional: using the `nolints-file` flag, the exceptions file can be configured. If the flag is omitted, we try to find a file at `scripts/nolints-style.txt` --- and otherwise proceed with no style exceptions. This means mathlib can continue unchanged, and downstream projects can either add an explicit exceptions file, or proceed without any exceptions. After this PR, one should be able to run lint-style on a downstream project by `lake exe lint-style ProjectName`. Prompted by [this zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/lint-style.20for.20downstream.20libraries). --- - [x] depends on: #24570 - [x] depends on: #24953 (I did not test the last part.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-author please-adopt	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	21	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	115-71013 3 months ago	367-45346 367 days ago	43-17409 43 days
12879	grunweg author:grunweg	feat: port ge_or_gt linter from mathlib3	Code works and is essentially green: next step is to split up into separate PRs. Feedback welcome on whether: - all the test changes are good, or I should simply allow it in more cases - if calc blocks need to be explicitly exempt --- - [ ] depends on: #12933 - [ ] depends on: #12934 - [ ] depends on: #12931 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter tech debt blocked-by-other-PR	736/319	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Archive/Wiedijk100Theorems/BirthdayProblem.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Nat/Upto.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Order/Filter/AtTopBot.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Datatypes.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/GeOrGt.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/MetricSpace/Cauchy.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sequences.lean,scripts/lint-style.py,test/Explode.lean,test/GCongr/inequalities.lean,test/GeOrGt.lean,test/LibrarySearch/IsCompact.lean,test/LibrarySearch/basic.lean,test/Recall.lean,test/Rify.lean,test/Use.lean,test/cancel_denoms.lean,test/congr.lean,test/delabLinearIndependent.lean,test/delaborators.lean,test/interval_cases.lean,test/linarith.lean	109	4	['github-actions', 'grunweg', 'urkud']	nobody	112-28594 3 months ago	733-29588 733 days ago	0-15256 4 hours
8608	eric-wieser author:eric-wieser	feat: multiplicativize `AddTorsor`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra please-adopt label:t-algebra$	268/199	Mathlib/Algebra/AddTorsor.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Tactic/ToAdditive.lean	4	2	['alreadydone']	nobody	111-15472 3 months ago	unknown	0-0 0 seconds
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	We define combinatorial maps, then we define planar graph using combinatorial maps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-combinatorics	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	29	['MrBrain295', 'Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	108-4859 3 months ago	318-3083 318 days ago	72-49525 72 days
24100	eric-wieser author:eric-wieser	feat: restore some explicit binders from Lean 3	Part of #24099 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author tech debt t-topology t-algebra label:t-algebra$	39/42	Mathlib/Data/FinEnum.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	10	3	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	107-24659 3 months ago	398-16262 398 days ago	0-954 15 minutes
25474	adomani author:adomani	test for .lean/.md check	A test PR for #25473. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter file-removed WIP	10/1	.github/workflows/lint_and_suggest_pr.yml,Mathlib.lean,Mathlib/NumberTheory/NumberField/CMField.Lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	106-55810 3 months ago	347-67856 347 days ago	0-907 15 minutes
33991	grunweg author:grunweg	test: pretty-printing of class abbrev	Lake build fails with an error in batteries: what am I doing wrong? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict file-removed large-import WIP	118/303	.github/workflows/daily.yml,Mathlib.lean,Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Unbundled/Basic.lean,Mathlib/CategoryTheory/Limits/Yoneda.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Int/Cast/Pi.lean,Mathlib/Data/Int/Init.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/GetD.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/Multiset/Defs.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Init.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/Lean/Meta/Simp.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/GaloisConnection/Defs.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Push/Attr.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Util/AssertExists.lean,MathlibTest/AssertExists.lean,MathlibTest/CalcQuestionMark.lean,MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/DirectoryDependencyLinter/Test.lean,MathlibTest/EmptyLine.lean,MathlibTest/ExtractGoal.lean,MathlibTest/HaveLetLinter.lean,MathlibTest/LibrarySearch/IsCompact.lean,MathlibTest/LintStyle.lean,MathlibTest/TacticAnalysis.lean,MathlibTest/UnusedInstancesInType.lean,MathlibTest/Util/PrintSorries.lean,MathlibTest/WhitespaceLinter.lean,MathlibTest/aesop_cat.lean,MathlibTest/eqns.lean,MathlibTest/fast_instance.lean,MathlibTest/globalAttributeIn.lean,MathlibTest/hintAll.lean,MathlibTest/jacobiSym.lean,MathlibTest/slim_check.lean,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain	61	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	106-55753 3 months ago	123-70438 123 days ago	0-111 1 minute
31110	bryangingechen author:bryangingechen	ci: don't delete merged branches	This will only affect PRs that are not from forks (e.g. this one). The motivation is that #30913 was closed automatically due to its target branch deleted after #30912 was merged. See also [#PR reviews > #30913 feat(Computability/Language):add subtraction notation @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2330913.20feat.28Computability.2FLanguage.29.3Aadd.20subtraction.20notation/near/548052556). Looking at the history, it looks like this option hasn't been changed since we added bors to mathlib3: https://github.com/leanprover-community/mathlib3/pull/2322 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI merge-conflict	1/1	bors.toml	1	5	['bryangingechen', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	106-55497 3 months ago	199-37512 199 days ago	0-64677 17 hours
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [x] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-ring-theory	516/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,scripts/nolints_prime_decls.txt	7	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	98-68713 3 months ago	318-5554 318 days ago	52-59768 52 days
14501	jjaassoonn author:jjaassoonn	feat: module structure of filtered colimit of abelian groups over filtered colimit of rings	This helps defining the module structure of stalks This contribution was inspired by the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #15315 [I am going to move the result in the new file] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra workshop-AIM-AG-2024 t-category-theory merge-conflict awaiting-author label:t-algebra$	439/2	Mathlib/CategoryTheory/Limits/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Limits/ConcreteCategory/WithAlgebraicStructures.lean	2	49	['YaelDillies', 'adamtopaz', 'alreadydone', 'erdOne', 'github-actions', 'jjaassoonn', 'joelriou', 'kbuzzard']	joelriou assignee:joelriou	97-61294 3 months ago	538-49562 538 days ago	64-30806 64 days
25035	ScottCarnahan author:ScottCarnahan	feat(Algebra/Module/Equiv/Defs): linear equivalence between linear hom and semilinear hom	Given a ring homomorphism `σ₂ : R →+* R₂`, an `R`-module `M`, and a module `M₂` for both `R` and `R₂` satisfying `SMulCommClass R R₂ M₂` and `(σ₂ r) • x = r • x`, we produce an `R₂`-linear equivalence between `M →ₗ[R] M₂` and `M →ₛₗ[σ₂] M₂`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra merge-conflict label:t-algebra$	21/0	Mathlib/Algebra/Module/Equiv/Defs.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	97-28192 3 months ago	343-78150 343 days ago	20-7584 20 days
34931	eric-wieser author:eric-wieser	perf: make TensorProduct.lift irreducible with a unification hint	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	6/2	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	7	['eric-wieser', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	erdOne assignee:erdOne	95-36733 3 months ago	95-36734 95 days ago	5-66655 5 days
23042	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add HasConicalLimitsOfSize.shrink	--- Note: I've marked this "WIP" because I'm not yet sure when this will be needed and I'd probably put the PR on the queue once I've created some follow-up needing it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory infinity-cosmos please-adopt	22/1	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	1	['github-actions']	nobody	93-5422 3 months ago	426-68322 426 days ago	0-1 1 second
23142	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add API for HasConicalLimit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-category-theory infinity-cosmos please-adopt	52/9	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	2	['github-actions', 'joelriou']	nobody	93-5422 3 months ago	423-71313 423 days ago	0-67788 18 hours
23145	joneugster author:joneugster	feat(CategoryTheory/Enriched/Limits): add IsConicalLimits	--- - [ ] depends on: #23142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-category-theory infinity-cosmos please-adopt	221/9	Mathlib.lean,Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean,Mathlib/CategoryTheory/Enriched/Limits/IsConicalLimit.lean	3	3	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	93-5421 3 months ago	424-52423 424 days ago	0-370 6 minutes
20401	RemyDegenne author:RemyDegenne	feat: add sigmaFinite_iUnion	```lean lemma sigmaFinite_iUnion (μ : Measure α) {s : ℕ → Set α} (h_meas : MeasurableSet (⋃ n, s n)) [∀ n, SigmaFinite (μ.restrict (s n))] : SigmaFinite (μ.restrict (⋃ n, s n)) ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-measure-probability	37/28	Mathlib/MeasureTheory/Decomposition/Exhaustion.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean	2	6	['RemyDegenne', 'github-actions', 'sgouezel', 'urkud']	nobody	92-74893 3 months ago	500-62409 500 days ago	0-73190 20 hours
11500	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Bundle continuity statements to `CLM`s. - Make `WeakDual` and `WeakSpace` reducible - Remove `refine'` in favor of `refine` --- Cleaning up `Analysis/NormedSpace/WeakDual` will be done in a second PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-topology	227/179	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/NormedSpace/Dual.lean,Mathlib/Analysis/NormedSpace/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	15	16	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll', 'urkud']	nobody	92-52280 3 months ago	741-51480 741 days ago	46-5571 46 days
20428	madvorak author:madvorak	feat(Data/Sign): lemmas about `∈ Set.range SignType.cast`	--- Perhaps `in_set_range_singType_cast_iff_abs` needs to be moved somewhere downstream.	merge-conflict WIP t-data	40/0	Mathlib/Data/Sign.lean	1	13	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'urkud']	nobody	92-52108 3 months ago	unknown	0-0 0 seconds
16553	grunweg author:grunweg	WIP: tinkering with orientable manifolds	- wait for #33307 to get merged - PR the "normed space" part separately - WIP: a linear isomorphism on a connected set is either orientation-preserving or orientation-preserving: some form of this was merged into mathlib recently; TODO update this PR accordingly! - [ ] depends on: #33307 - [x] depends on: #8738 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-differential-geometry blocked-by-other-PR	287/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	91-20575 3 months ago	unknown	0-0 0 seconds
24965	erdOne author:erdOne	refactor: Make `IsLocalHom` take unbundled map	Under the current definition, `IsLocalHom f` and `IsLocalHom f.toMonoidHom` are not defeq, which causes quite some annoyances. We also have a consensus to not use `*HomClass` in definitions. As a result, we change `IsLocalHom` to take an unbundled function instead of a funlike. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated merge-conflict label:t-algebra$	18/9	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean	5	15	['adomani', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vihdzp']	mattrobball assignee:mattrobball	90-18711 3 months ago	181-70880 181 days ago	24-84527 24 days
25622	eric-wieser author:eric-wieser	refactor: overhaul instances on LocalizedModule	This: * Generalizes the `SMul`, `Module`, and `Algebra` instances via appropriate compatibility conditions * Generalizes the `Mul` instance to the non-unital setting * Fixes instances diamonds for the `Nat`- and `Int`-actions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	214/100	Mathlib/Algebra/Module/LocalizedModule/Basic.lean	1	6	['erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts']	nobody	90-18708 3 months ago	unknown	0-0 0 seconds
34075	eric-wieser author:eric-wieser	feat: add a typeclass for the continuum hypothesis	This allows a proof from the Archive to be promoted to mathlib itself. The proof strategy of `iff_exists_sierpinski_pathological_pred` was written almost entirely with public Gemini 3 Thinking, and then manually corrected. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	200/58	Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/SetTheory/Cardinal/ContinuumHypothesis.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	3	27	['b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	nobody	89-81434 3 months ago	38-20213 38 days ago	0-44643 12 hours
12933	grunweg author:grunweg	chore: replace some use of > or ≥ by < or ≤	These were flagged by the linter in #12879: it is easy to simple avoid > or ≥ in hypotheses or `have`s. --- - [x] depends on: #35346 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	123/123	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Nat/Dist.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Parity.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/UInt.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/Padics/Hensel.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/Rayleigh.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Tactic/IntervalCases.lean,Mathlib/Tactic/Linarith/Lemmas.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/NormNum/GCD.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/ContinuousFunction/Bounded.lean,Mathlib/Topology/MetricSpace/CauSeqFilter.lean,Mathlib/Topology/Sequences.lean,test/LibrarySearch/basic.lean,test/Use.lean,test/cancel_denoms.lean,test/linarith.lean,test/norm_cast.lean	64	7	['YaelDillies', 'github-actions', 'grunweg', 'mathlib-dependent-issues']	nobody	86-60 2 months ago	732-70339 732 days ago	0-55656 15 hours
20238	maemre author:maemre	feat(Computability/DFA): Closure of regular languages under some set operations	This shows that regular languages are closed under complement and intersection by constructing DFAs for them. --- Closure under all other operations will be proved when someone adds the proof for DFA<->regular expression equivalence, so they are not part of this PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	60	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'mathlib4-merge-conflict-bot', 'meithecatte', 'urkud']	nobody	81-69422 2 months ago	427-47361 427 days ago	48-67492 48 days
22361	rudynicolop author:rudynicolop	feat(Computability/NFA): nfa closure properties	Add the closure properties union, intersection and reversal for NFA. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability merge-conflict awaiting-author awaiting-zulip	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	nobody	81-69406 2 months ago	378-51300 378 days ago	39-60525 39 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- - [x] depends on: #25321 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-zulip new-contributor awaiting-author	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	42	['YaelDillies', 'dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	81-3035 2 months ago	345-32334 345 days ago	34-10092 34 days
8102	miguelmarco author:miguelmarco	feat(Tactic): add `unify_denoms` and `collect_signs` tactics	This PR adds four new tactics: - `unify_denoms` tries to put expressions with several divisions in a form with only one division. In the case of fields, it works similarly to `field_simp`, but if the hypothesis about denominators being nonzero are not present, it assumes them, and leaves them as new goals to prove. In that sense, it is an "unsafe" tactic (but can be useful nevertheless, for example when you can't find which exact hypothesis is missing). It also works with expressions of naturals and Euclidean domains, assuming the corresponding hypothesis about the denominators dividing the numerators. - `unify_denoms!` extends `unify_denoms` to work with (in)equalities, assuming also that the denominators, once in normal form, are positive. - `collect_signs` works similarly with expressions using sums and substractions: it tries to put them in a form of one sum minus other sum. In the case of working with naturals, it assumes that we never substract a bigger number from a smaller one. Both are implemented essentially as a macro that combines several rewriting rules. Some new lemmas with the corresponding rules are added. ---	please-adopt new-contributor merge-conflict modifies-tactic-syntax good first issue t-meta	407/0	Mathlib.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean,MathlibTest/unify_denoms.lean,scripts/noshake.json	7	55	['Paul-Lez', 'YaelDillies', 'github-actions', 'joneugster', 'kbuzzard', 'mathlib4-merge-conflict-bot', 'miguelmarco']	nobody	80-53733 2 months ago	369-36205 369 days ago	17-14109 17 days
15355	adomani author:adomani	feat: MiM PR report	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP merge-conflict	193/0	.github/workflows/monthly_pr_report.yaml,scripts/README.md,scripts/find_labels.sh	3	18	['YaelDillies', 'adomani', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	77-39102 2 months ago	unknown	0-0 0 seconds
22464	adomani author:adomani	feat(CI): declarations diff in Lean	Rewrites the `declaration_diff` script in Lean. You can see the effect of the new script in the testing branch #22497. The new CI step runs in approximately 5mins, but is separate from the `build` step. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author CI merge-conflict	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	8	['bryangingechen', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	nobody	77-37507 2 months ago	294-18773 294 days ago	146-23496 146 days
35547	Ruben-VandeVelde author:Ruben-VandeVelde	chore: tidy various files	--- As usual, `simp`s didn't seem slow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author merge-conflict	83/117	Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Morphisms/Smooth.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/ZariskisMainTheorem.lean,Mathlib/Analysis/Complex/CoveringMap.lean,Mathlib/Analysis/Complex/MeanValue.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/PowersetCard.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/JordanChevalley.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/SubFinite.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Indexed.lean,Mathlib/Probability/Distributions/Cauchy.lean,Mathlib/RingTheory/Etale/QuasiFinite.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Polynomial/Subring.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/UniqueFactorizationDomain/ClassGroup.lean,Mathlib/RingTheory/Unramified/LocalStructure.lean,Mathlib/RingTheory/ZariskisMainTheorem.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Majorized.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Algebra/MulAction.lean	32	14	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'vihdzp']	nobody	74-17017 2 months ago	87-44194 87 days ago	0-67842 18 hours
34501	eric-wieser author:eric-wieser	chore(Data/Fintype/Induction): add a workaround for a bug in `induction`	This works around leanprover/lean4#4246, as Zulip threads frequently run up against this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta please-adopt	15/1	Mathlib/Data/Fintype/Option.lean	1	3	['github-actions', 'joneugster']	joneugster assignee:joneugster	73-69930 2 months ago	108-50273 108 days ago	2-59629 2 days
8479	alexjbest author:alexjbest	feat: use leaff in CI	[Leaff](https://github.com/alexjbest/leaff) is an experimental lean-diff tool, this PR is to experiment with adding it as a CI step. --- I'm not sure yet if it is best to have this always run or only run on request (like bench). If it is always run should it post a comment or simply leave its output it the actions log (maybe as a summary object) the current iteration runs and updates a sticky comment with the latest result [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP awaiting-author	340/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml	4	13	['alexjbest', 'fpvandoorn', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'urkud']	nobody	73-59474 2 months ago	913-36848 913 days ago	0-26 26 seconds
13483	adomani author:adomani	feat: automatically replace deprecations	This PR introduces `lake exe update_deprecations` that uses the cache to automatically replace deprecated declarations with the corresponding un-deprecated one. The script handles namespacing, replacing a possibly non-fully-qualified, deprecated name with the fully-qualified non-deprecated name. It is also possible to use ```bash lake exe update_deprecations --mods One.Two.Three,Dd.Ee.Ff ``` to limit the scope of the replacements to the modules `One.Two.Three` and `Dd.Ee.Ff`. This is intended to be a first step in automating updates: combining this with a linter that emits appropriate warnings, the functionality of `lake exe update_deprecations` can be extended to perform more complicated updates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-meta	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	18	['YaelDillies', 'adomani', 'fpvandoorn', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	73-59446 2 months ago	553-50552 553 days ago	34-80803 34 days
14313	grhkm21 author:grhkm21	feat(RepresentationTheory/FdRep): FdRep is a full subcategory of Rep	``` /-- Equivalence between `FDRep` and the full subcategory of finite dimensional `Rep`. -/ def equivFiniteDimensional : FDRep k G ≌ FullSubcategory (fun V : Rep k G ↦ FiniteDimensional k V) ```	merge-conflict t-algebra t-category-theory new-contributor label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	21	['fpvandoorn', 'github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	73-59423 2 months ago	666-25447 666 days ago	4-83177 4 days
14712	astrainfinita author:astrainfinita	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra label:t-algebra$	49/20	Mathlib/Algebra/Group/Nat.lean,Mathlib/Algebra/Group/ZeroOne.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/UInt.lean,Mathlib/NumberTheory/ArithmeticFunction.lean	9	26	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	73-59404 2 months ago	648-37574 648 days ago	20-15089 20 days
17627	hrmacbeth author:hrmacbeth	feat: universal properties of vector bundle constructions	Characterizations for the smoothness of maps into the total spaces of (1) the direct sum of two vector bundles; (2) the pullback of a vector bundle. This gap in the library was exposed by #17358. --- - [x] depends on: #22804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-differential-geometry	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	26	['PatrickMassot', 'fpvandoorn', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	73-59392 2 months ago	333-59131 333 days ago	91-68302 91 days
19275	eric-wieser author:eric-wieser	fix: if nolint files change, do a full rebuild	Otherwise CI will succeed when removing entries from the file, but fail later when someone changes something unrelated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	8/0	lakefile.lean	1	22	['YaelDillies', 'adomani', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	73-59375 2 months ago	545-13610 545 days ago	0-214 3 minutes
24434	joelriou author:joelriou	feat(CategoryTheory): effectiveness of descent	(This is very much a draft, it will be split in multiple PRs later.) Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [ ] depends on: #35452 - [ ] depends on: #35393 - [ ] depends on: #35396 - [ ] depends on: #35401 - [x] depends on: #24411 - [x] depends on: #24382 - [x] depends on: #25971 - [x] depends on: #13539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-category-theory	4052/66	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Adj.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/BaseChange.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/Functor/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/Opposite.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/CommSq.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataAsCoalgebra.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataDoublePrime.lean,Mathlib/CategoryTheory/Sites/Descent/DescentDataPrime.lean,Mathlib/CategoryTheory/Sites/Descent/IsPrestack.lean,Mathlib/CategoryTheory/Sites/Descent/IsStack.lean,Mathlib/CategoryTheory/Sites/Descent/ModuleCat.lean,Mathlib/CategoryTheory/Sites/Descent/PullbackStruct.lean	19	23	['alreadydone', 'callesonne', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'yuma-mizuno']	nobody	73-40433 2 months ago	unknown	0-0 0 seconds
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta please-adopt WIP	123/4	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CheckCompositions.lean,Mathlib/Tactic/CheckEqualities.lean,Mathlib/Tactic/Common.lean,MathlibTest/check_equalities.lean	7	21	['adomani', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	70-13680 2 months ago	56-61537 56 days ago	32-12136 32 days
35588	eric-wieser author:eric-wieser	chore(Util/Qq): remove `meta`	These are wrappers of existing functions on `Expr`s which are also not marked `meta`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-CI delegated	7/7	Mathlib/Data/Multiset/Sort.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Order/ToInt.lean,Mathlib/Tactic/Simproc/Divisors.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Util/Qq.lean	7	3	['Vierkantor', 'github-actions', 'mathlib-bors']	nobody	68-77766 2 months ago	86-75702 86 days ago	0-35325 9 hours
14603	awueth author:awueth	feat: degree is invariant under graph isomorphism	--- Mathlib has the definition `SimpleGraph.Iso.mapNeighborSet` which is an equivalence between neighbor sets induced by an isomorphism. Would it be beneficial to add the same equivalence for `neighborFinset`? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-combinatorics new-contributor	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	12	['SnirBroshi', 'awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	67-86307 2 months ago	644-46746 644 days ago	31-44440 31 days
9605	davikrehalt author:davikrehalt	feat(Data/Finset & List): Add Lemmas for Sorting and Filtering	This PR includes several useful lemmas to the Data/Finset and Data/List modules in Lean's mathlib: 1. `toFinset_filter` (List): Shows that filtering commutes with toFinset. 2. `toFinset_is_singleton_implies_replicate` (List): Shows a list with a singleton toFinset is a List.replicate. 3. `filter_sort_commute` (Finset): Sorting and filtering can be interchanged in Finsets. 4. `Sorted.filter` (List): A sorted list stays sorted after filtering. 5. `Sorted.append_largest` (List): Appending the largest element keeps a list sorted. 6. `sort_monotone_map` (Finset): Relates sorting of a Finset after mapping to sorting of a list. 7. `sort_insert_largest` (Finset): Sorting a Finset with an inserted largest element. 8. `sort_range` (Finset): Sorting a range in a Finset equals the corresponding range list. 9. ~~`filter_eval_true` (List): Filtering a list with a predicate always true keeps the list unchanged.~~ 10. ~~`filter_eval_false` (List): Filtering with an always-false predicate gives an empty list.~~ 11. ~~`pairwise_concat` (List): Iff condition for Pairwise relation in concatenated lists (similar to pairwise_join).~~ 12. `list_map_toFinset` (Finset): toFinset commutes with map under injection --- - [x] depends on: #15952 This is my first PR to mathlib, so I'm not too familiar with etiquette's and more specifically there are two proofs in the PR which uses aesop, and I am not sure if it's frowned upon. I kept the aesop in there for now as I couldn't construct very short proofs otherwise. The sort_range function proof was suggested in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Computing.20Finset.20sort.20of.20Finset.20range/near/410346731 by Ruben Van de Velde. Thanks for your time for improving this PR.	please-adopt t-data new-contributor merge-conflict awaiting-author	71/0	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean	4	30	['YaelDillies', 'davikrehalt', 'eric-wieser', 'github-actions', 'jcommelin', 'urkud', 'vihdzp']	nobody	67-69200 2 months ago	847-40688 847 days ago	12-48883 12 days
10332	adri326 author:adri326	feat(Topology/Sets): define regular open sets and their boolean algebra	Introduces a new module, `Mathlib.Topology.Sets.RegularOpens`, which defines the `IsRegularOpen s` predicate (`interior (closure s) = s`) and `TopologicalSpace.RegularOpens`, the type of bundled regular open sets (defined as `Heyting.Regular (Opens X)`). A few properties of regular open sets (bundled and unbundled) and `interior (closure s)` are proven, and a pointwise instance of `MulAction` is provided for regular open sets. --- This PR belongs to my series of PRs around my formalization of Rubin's theorem. There are two possible ways to implement `RegularOpens`: - either construct them by hand and show that they form a boolean algebra (better def-eq but more boilerplate code required) - or use `Heyting.Regular` on the heyting algebra of `Opens` inherited from the `Frame` instance on them I first chose to use the former approach, but using the latter cuts the length of the construction of the boolean algebra of regular open sets by 100 lines of code, and allows us to inherit all of the helper lemmas defined for `Heyting.Regular`. The big downside, though, is that an element of `RegularOpens` isn't defined as a bundled regular open set anymore, but rather as an `Opens` set `s` for which `Opens.interior ↑(Opens.interior ↑sᶜ)ᶜ = s`, so I added an alternative constructor `RegularOpens.of` that instead accepts any set `s` for which `IsRegularOpen s` holds. Another minor downside is that coercion to a set takes two coercions instead of one. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology	434/0	Mathlib.lean,Mathlib/Data/Set/Pointwise/SMul.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sets/RegularOpens.lean,docs/references.bib	5	1	['adri326']	nobody	67-69167 2 months ago	831-52608 831 days ago	0-1135 18 minutes
16801	awainverse author:awainverse	feat(ModelTheory/Equivalence): The quotient type of formulas modulo a theory	Defines `FirstOrder.Language.Theory.Formula`: `T.Formula α` is the quotient of `L.Formula α` by equivalence modulo a theory `T`. Puts a boolean algebra instance on `T.Formula α`, with `≤` corresponding to implication. --- - [x] depends on: #16799 - [x] depends on: #16800 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-logic	174/60	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Types.lean	3	30	['YaelDillies', 'awainverse', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'metinersin']	nobody	65-44174 2 months ago	563-64805 563 days ago	29-26213 29 days
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-computability awaiting-author new-contributor	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	55	['YaelDillies', 'github-actions', 'madvorak', 'mathlib4-merge-conflict-bot', 'shetzl']	nobody	65-44150 2 months ago	374-67446 374 days ago	72-2714 72 days
37232	mathlib-splicebot author:mathlib-splicebot	chore(Algebra/Order): bound on `\|n / m\|ₘ` and `\|n - m\|`	This PR was automatically created from PR #34722 by @GrigorenkoPV via a [review comment](https://github.com/leanprover-community/mathlib4/pull/34722#discussion_r2996870566) by @Vierkantor.	t-algebra delegated label:t-algebra$	5/0	Mathlib/Algebra/Order/Group/Unbundled/Abs.lean	1	6	['Vierkantor', 'bryangingechen', 'github-actions', 'mathlib-bors']	nobody	53-24352 1 month ago	53-36785 53 days ago	0-588 9 minutes
36706	kim-em author:kim-em	feat(Tactic/FastInstance): warn when a synthesized sub-instance has leaky binder types	This PR adds a warning to `fast_instance%` and `inferInstanceAs%` when they encounter a synthesized sub-instance that has leaky data-field binder types. When `fast_instance%` recursively normalizes a class instance, it uses `trySynthInstance` to find canonical sub-instances. If a found sub-instance is not canonical at instances transparency (i.e., its internal lambda binder types reference an unexpanded type alias instead of the target carrier), the tool now emits a warning: ``` fast_instance%: 'leakySub' (for SubClass MyNat) has leaky data-field binder types, which may cause `isDefEq` failures at instances transparency (e.g. in `grind`). Consider redefining it with `fast_instance%` or `inferInstanceAs%`. To suppress: `set_option Elab.fast_instance.warnLeakySubInstances false` ``` The leakiness check uses `withDisabledInstance` to temporarily evict the sub-instance from the discrimination tree (preventing trivial self-match via `trySynthInstance`), then compares against the canonical form at instances transparency. A `warnLeaky` parameter propagates through recursive calls to prevent nested warnings. The warning is suppressed via `set_option Elab.fast_instance.warnLeakySubInstances false`. - [ ] depends on: #36701 🤖 Prepared with Claude Code	t-meta blocked-by-other-PR large-import LLM-generated merge-conflict	415/21	Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/Init.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean,MathlibTest/InferInstanceAsPercent.lean	11	7	['Vierkantor', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	52-28703 1 month ago	64-6408 64 days ago	0-1003 16 minutes
37432	mariainesdff author:mariainesdff	feat(Algebra/BigOperators/NatAntidiagonal): add ofAdd_antidiagonal	Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	27/0	Mathlib/Algebra/BigOperators/NatAntidiagonal.lean	1	2	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	27-72806 27 days ago	39-34164 39 days ago	9-25258 9 days
36709	kim-em author:kim-em	feat(DefEqAbuse): suggest minimal @[implicit_reducible] workaround	This PR extends `#defeq_abuse` to suggest a minimal set of `@[implicit_reducible]` annotations that would make the failing tactic or command succeed with `backward.isDefEq.respectTransparency true`. When `#defeq_abuse` detects a failure, it now runs a greedy minimisation over semireducible definitions reachable from the goal/command, finding a (possibly non-unique) minimal subset that, when temporarily marked `@[implicit_reducible]`, fixes the issue. The result is reported as an `info` message: ``` info: Workaround: the following @[implicit_reducible] annotations (a possibly non-unique minimal set) would paper over this problem, but the real issue is likely a leaky instance somewhere. set_option allowUnsafeReducibility true attribute [implicit_reducible] MyPred ``` This is a workaround, not a fix — the real cause is usually a leaky instance (which `#check_instance` from https://github.com/leanprover-community/mathlib4/pull/36706 can diagnose). But it can be useful for quick debugging. New helpers: `collectCandidates`, `markImplicitReducible`, `withTempImplicitReducible`, `withTempImplicitReducibleCmd`, `suggestAnnotationsTac`, `suggestAnnotationsCmd`, `formatAnnotations`, `logAnnotationSuggestions`. 🤖 Prepared with Claude Code	t-meta LLM-generated	187/17	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	6	['github-actions', 'kim-em', 'mathlib-merge-conflicts', 'thorimur']	dwrensha and thorimur assignee:dwrensha assignee:thorimur	20-64463 20 days ago	20-64508 20 days ago	37-62711 37 days
37073	kim-em author:kim-em	feat: add wrap_instance% using core's wrapInstance	This PR adds a new `wrap_instance%` term elaborator that delegates to Lean core's `wrapInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `wrap_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.wrapInstance`. Like `fast_instance%`, it reduces instances to constructor applications and reuses canonical sub-instances. Unlike `fast_instance%`, it works at `instances` transparency and delegates all normalization logic to core. The replaced sites cover: - Equiv/type-alias transfers (WithAbs, WithConv, WithVal, WithLp, TransferInstance) - Surjective constructors (Con, RingCon quotients, module congruences) - DFunLike leaf instances (MultilinearMap, ContinuousMultilinearMap, AlternatingMap, Intertwining) - Quotient instances (LinearAlgebra/Quotient/Defs) - inferInstanceAs% sites (StandardPart, Presentation/Core) - Miscellaneous (InfiniteAdeleRing, ZMod) This PR doesn't attempt to replace all `fast_instance%`; it gets more complicated! 🤖 Prepared with Claude Code		88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/WithConv.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	16	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	20-5822 20 days ago	20-5849 20 days ago	22-79349 22 days
36701	kim-em author:kim-em	feat(DefEqAbuse): detect and report leaky instance binder types	This PR adds `#check_instance` and `checkInstance` to `Mathlib/Tactic/FastInstance.lean` to diagnose individual instances for leaky data-field binder types, and integrates this into `#defeq_abuse` so it automatically reports leaky instances. A new `withDisabledInstance` helper temporarily evicts an instance from the discrimination tree (via `Attribute.erase` + `withoutModifyingEnv`), allowing `makeFastInstance` to compute the canonical form without `trySynthInstance` trivially finding the instance being checked. `#defeq_abuse` now checks instances used in the failing goal/command for leakiness and reports them alongside the isDefEq failure diagnostics. Example: `#check_instance` ```lean def MyNat := ℕ -- Without fast_instance%, the `add` field has binder type ℕ rather than MyNat. instance leakyAdd : Add MyNat := ⟨Nat.add⟩ #check_instance leakyAdd -- ❌ 'leakyAdd': leaky binder types detected. -- The data field `add` has binder type ℕ where MyNat is expected. -- The `fast_instance%` elaborator may be useful as a repair or band-aid: -- `instance : ... := fast_instance% ` instance fixedAdd : Add MyNat := fast_instance% ⟨Nat.add⟩ #check_instance fixedAdd -- ✅ 'fixedAdd': canonical (re-inferred form agrees at instances transparency) ``` 🤖 Prepared with Claude Code	LLM-generated awaiting-author t-meta merge-conflict	317/17	Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean	4	43	['JovanGerb', 'Vierkantor', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'ocfnash']	Vierkantor assignee:Vierkantor	19-25312 19 days ago	56-39071 56 days ago	6-60386 6 days
37364	kim-em author:kim-em	feat(Tactic/Linter): add `auxLemma` linter for auto-generated declaration references	This PR adds a syntax linter that flags explicit references to auto-generated auxiliary declarations such as `_proof_N`, `match_N`, `_match_N`, and `_sizeOf_N`. These names are internal to the Lean elaborator and are not stable across refactors (e.g. reordering fields in a structure can renumber `_proof_` indices). The linter matches precisely: it requires the suffix after the prefix to be all digits, so `_proof_helper` would not be flagged. It only inspects identifier syntax nodes, so references in comments and docstrings are ignored. Current hits in Mathlib (suppressed with `set_option linter.style.auxLemma false`): - `Mathlib/CategoryTheory/Functor/Category.lean` — `hcomp._proof_2` - `Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean` — `constFormalMultilinearSeries.match_1.eq_2` - `Mathlib/Data/List/Sigma.lean` — `_sizeOf_1` Companion PR to track these suppressions in the tech debt report: https://github.com/leanprover-community/mathlib-ci/pull/17 🤖 Prepared with Claude Code	t-linter awaiting-author	87/1	Mathlib.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/AuxLemma.lean,MathlibTest/CompileInductive.lean,MathlibTest/interactiveUnfold.lean,MathlibTest/toAdditive.lean	10	35	['github-actions', 'grunweg', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	14-58405 14 days ago	14-58434 14 days ago	8-22290 8 days
38597	kim-em author:kim-em	chore: backport robustness changes from bump/nightly-2026-04-27	See [#nightly-testing > nightly#213 adaptations for nightly-2026-04-27 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/428973-nightly-testing/topic/nightly.23213.20adaptations.20for.20nightly-2026-04-27/near/591262169).	t-category-theory delegated	91/26	Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Hypercover/One.lean	7	10	['github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	joelriou assignee:joelriou	8-69402 8 days ago	8-69403 8 days ago	11-49769 11 days
18551	joelriou author:joelriou	feat(AlgebraicGeometry): the algebraic De Rham complex	If `B` is an `A`-algebra, we construct the algebraic De Rham complex of `B` over `A`: it is a cochain complex of `A`-modules. --- - [ ] depends on: #18735 - [ ] depends on: #18662 - [ ] depends on: #26464 - [ ] depends on: #26465 - [x] depends on: #18534 - [x] depends on: #18440 - [x] depends on: #18432 - [x] depends on: #18408 - [x] depends on: #18389 - [x] depends on: #18374 - [x] depends on: #18359 - [x] depends on: #18332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra blocked-by-other-PR merge-conflict t-algebraic-geometry label:t-algebra$	2836/156	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/Basic.lean,Mathlib/Algebra/Module/Presentation/Cokernel.lean,Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/Algebra/Module/Presentation/DirectSum.lean,Mathlib/Algebra/Module/Presentation/ExteriorPower.lean,Mathlib/Algebra/Module/Presentation/PiTensor.lean,Mathlib/Algebra/Module/Presentation/RestrictScalars.lean,Mathlib/Algebra/Module/Presentation/Tensor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct/Finite.lean,Mathlib/LinearAlgebra/PiTensorProduct/Generators.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/DeRham/Basic.lean,Mathlib/RingTheory/PiTensorProduct.lean	26	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-40817 6 days ago	unknown	0-0 0 seconds
32305	faenuccio author:faenuccio	feat: define Sobolev Spaces	Nothing to see yet. --- - [x] depends on: #32250 - [x] depends on: #31809 - [ ] depends on: #39217 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis large-import	2487/53	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Distribution/WeakDeriv.lean,Mathlib/Analysis/FunctionalSpaces/Sobolev/Basic.lean,Mathlib/MeasureTheory/Function/LocallyIntegrable.lean	7	8	['ADedecker', 'faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	6-18339 6 days ago	168-56654 168 days ago	0-2 2 seconds
39383	fpvandoorn author:fpvandoorn	fix: use notation3 more	* `notation3` is better at generating delaborators in the presence of implicit arguments, other notation and some other complications. * I explicitly tested that each change was not correctly pretty-printed before, but now is. * Add spaces around the global notation `^+` (that maybe shouldn't be global at all?) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		21/21	Mathlib/Algebra/Ring/Action/Submonoid.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/Data/Sum/Order.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/Order/InitialSeg.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	10	1	['github-actions']	nobody	4-35755 4 days ago	4-41325 4 days ago	4-41317 4 days
39371	fpvandoorn author:fpvandoorn	feat: tag lemmas with compactness and closedness	--- - [ ] depends on: #39370 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	190/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	13	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-33122 4 days ago	4-47393 4 days ago	0-1 1 second
39382	fpvandoorn author:fpvandoorn	feat: add some lemmas that closures of some sets are compact	* Also tag them with `closedness`/`compactness`. * This can be refactored to use `RelativelyCompact` once we define that notion. * Note: this is only equivalent to `IsBounded` in `ProperSpace`. It is equivalent to `@IsBounded _ (inCompact X) s` in a T2-space, but the latter thing is cumbersome to write. --- - [ ] depends on: #39371 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	265/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	14	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-29033 4 days ago	4-43133 4 days ago	0-359 5 minutes
22925	ggranberry author:ggranberry	feat(Mathlib/PlaceHolder/ToeplitzHausdorff): Toeplitz-Hausdorff	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP new-contributor will-close-soon awaiting-author help-wanted t-analysis	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	16	['AntoineChambert-Loir', 'faenuccio', 'ggranberry', 'github-actions', 'vihdzp']	faenuccio assignee:faenuccio	3-56544 3 days ago	427-48053 427 days ago	3-8649 3 days
39325	mcdoll author:mcdoll	feat(FunProp): tag integrableOn	Add tags so that `fun_prop` can prove `IntegrableOn` Done at ICERM workshop "Techniques and Tools for the Formalization of Analysis" --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	108/12	Mathlib/MeasureTheory/Function/LocallyIntegrable.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,MathlibTest/FunProp.lean	3	4	['fpvandoorn', 'github-actions']	nobody	3-17300 3 days ago	3-32366 3 days ago	0-1567 26 minutes
39326	mcdoll author:mcdoll	chore(FunProp): additional lemmas for `Integrable`	Done at ICERM workshop "Techniques and Tools for the Formalization of Analysis". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	6/1	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/MeasureTheory/Function/L1Space/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Integral/Prod.lean	4	1	['github-actions']	EtienneC30 assignee:EtienneC30	3-12833 3 days ago	5-30565 5 days ago	5-30557 5 days
39468	ADedecker author:ADedecker	feat: LinearMap.HasFiniteRank and the associated relation	This was written by @PatrickMassot at the May 2026 ICERM workshop as part of the project on Fredholm operators. This also adds three supporting lemmas: `map_smul_le_map`, `range_smul_le_range` and `ker_le_ker_smul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	194/8	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/FiniteRankLinearMap.lean	5	1	['github-actions']	nobody	2-35148 2 days ago	2-35223 2 days ago	2-37511 2 days
7873	astrainfinita author:astrainfinita	perf: reorder `extends` and change instance priority in algebra hierarchy	There are no strict rules, but in general `Cancel` is dropped first, then `Comm`, then `Neg / Inv`, then `Assoc`. Not sure if there's a better way. An important goal is to search for `Zero/One/Add/Mul` instances first along `Zero/One/Add/Mul` -> ... -> `Ring` -> `CommRing` -> `Field`. --- - [ ] depends on: #14712 - [x] depends on: #16638 - [ ] depends on: #18464 - [ ] depends on: #18468 - [ ] depends on: #18470 - [ ] depends on: #18472 - [ ] depends on: #18474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	494/204	Archive/Imo/Imo1998Q2.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Prod.lean,Mathlib/Algebra/GroupWithZero/Semiconj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShiftSequence.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Field/Canonical/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/NormedSpace/Star/Multiplier.lean,Mathlib/CategoryTheory/Preadditive/FunctorCategory.lean,Mathlib/CategoryTheory/Preadditive/SingleObj.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Real/ENatENNReal.lean,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/Init/ZeroOne.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/MeasureTheory/Decomposition/Jordan.lean,Mathlib/MeasureTheory/Decomposition/SignedLebesgue.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/RamificationInertia.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean,Mathlib/Order/Filter/Germ.lean,Mathlib/Order/Interval/Finset/Box.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Henselian.lean,Mathlib/RingTheory/Ideal/IsPrincipal.lean,Mathlib/RingTheory/Ideal/LocalRing.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/MvPolynomial/Symmetric.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/UniqueFactorizationDomain.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Tactic/Positivity/Core.lean	104	84	['MichaelStollBayreuth', 'astrainfinita', 'github-actions', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	2-26845 2 days ago	674-40456 674 days ago	3-36575 3 days
39155	mathlib-nolints author:mathlib-nolints	chore: lake shake --add-public --keep-implied --keep-prefix --fix	I am happy to shake some imports for you! 381 files changed · +406 imports added · -346 imports removed --- [workflow run for this PR](https://github.com/leanprover-community/mathlib4/actions/runs/26001831423) [explain.txt](https://github.com/leanprover-community/mathlib4/actions/runs/26001831423/artifacts/7045805363)	large-import	406/346	Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Saturation.lean,Mathlib/Algebra/Group/Submonoid/Support.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/MapBijective.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/ModelCategory/Injective.lean,Mathlib/Algebra/Homology/ModelCategory/Lifting.lean,Mathlib/Algebra/Lie/CartanCriterion.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Algebra/Module/Submodule/Invariant.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MvPolynomial/Cardinal.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Nilpotent.lean,Mathlib/Algebra/NonAssoc/PreLie/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Finset.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/Cast.lean,Mathlib/Algebra/Order/SuccPred.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Regular/Defs.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/Morphisms/Finite.lean,Mathlib/AlgebraicGeometry/Morphisms/FlatRank.lean,Mathlib/AlgebraicGeometry/Morphisms/SchemeTheoreticallyDominant.lean,Mathlib/AlgebraicGeometry/Morphisms/UniversallyClosed.lean,Mathlib/AlgebraicGeometry/Morphisms/WeaklyEtale.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicTopology/SimplicialCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialComplex/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/CStarAlgebra/Projection.lean,Mathlib/Analysis/Calculus/DerivativeTest.lean,Mathlib/Analysis/Calculus/FDeriv/Affine.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/LogDeriv.lean,Mathlib/Analysis/Complex/CanonicalDecomposition.lean,Mathlib/Analysis/Complex/Harmonic/Liouville.lean,Mathlib/Analysis/Complex/Harmonic/Poisson.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/Approximation.lean,Mathlib/Analysis/Convex/FunctionTopology.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/Normed/Module/Complemented.lean,Mathlib/Analysis/Normed/Module/DoubleDual.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean,Mathlib/Analysis/RCLike/ContinuousMap.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/RingInverseOrder.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/ChebyshevGauss.lean,Mathlib/CategoryTheory/Abelian/Preradical/Colon.lean,Mathlib/CategoryTheory/Adhesive/Subobject.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Widesubcategory.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Jointly.lean,Mathlib/CategoryTheory/Limits/Constructions/WidePullbackOfTerminal.lean,Mathlib/CategoryTheory/Limits/FunctorCategory/Shapes/Terminal.lean,Mathlib/CategoryTheory/Limits/Preserves/SigmaConst.lean,Mathlib/CategoryTheory/Limits/Preserves/Yoneda.lean,Mathlib/CategoryTheory/Limits/Yoneda.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Normal.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Mon.lean,Mathlib/CategoryTheory/Monoidal/Widesubcategory.lean	381	26	['JovanGerb', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	1-29655 1 day ago	1-29691 1 day ago	4-1595 4 days
39475	ADedecker author:ADedecker	feat: define LinearMap.QuasiInverse	If the name "QuasiInverse" is considered too vague, I am open to suggestions. This was written by @PatrickMassot and @CoolRmal at the May 2026 ICERM workshop as part of the project on Fredholm operators. --- - [ ] depends on: #39468 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR label:t-algebra$	347/8	Mathlib.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/LinearAlgebra/FiniteRankLinearMap.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-68692 19 hours ago	2-31393 2 days ago	0-1118 18 minutes
39370	fpvandoorn author:fpvandoorn	feat: add specialized grind sets	This adds two grind attributes for specialized tactics. See module doc for more information and motivation. This PR does not tag any lemmas yet. [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/small.20specialized.20grind.20sets/with/595132109) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	113/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean	4	5	['chenson2018', 'fpvandoorn', 'github-actions']	dwrensha assignee:dwrensha	0-48762 13 hours ago	4-47438 4 days ago	4-47430 4 days
31587	JovanGerb author:JovanGerb	Lean pr testing 11156	Testing the performance improvement given by not deleting cache so often when modifying the environment. cf. https://github.com/leanprover/lean4/pull/11156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	5932/1306	.github/workflows/build_template.yml,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2024Q6.lean,Cache/IO.lean,Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.lean,Mathlib/Algebra/Category/CoalgCat/ComonEquivalence.lean,Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/Algebra/Category/Grp/Biproducts.lean,Mathlib/Algebra/Category/Grp/Colimits.lean,Mathlib/Algebra/Category/Grp/LargeColimits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Biproducts.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/ExteriorPower.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Adjunction.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafification.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Limits.lean,Mathlib/Algebra/Category/MonCat/Yoneda.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Ring/Under/Basic.lean,Mathlib/Algebra/Category/Ring/Under/Limits.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Nat/Even.lean,Mathlib/Algebra/Group/Submonoid/BigOperators.lean,Mathlib/Algebra/GroupWithZero/Action/Faithful.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/AlternatingConst.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Homology/Bifunctor.lean,Mathlib/Algebra/Homology/BifunctorAssociator.lean,Mathlib/Algebra/Homology/BifunctorHomotopy.lean,Mathlib/Algebra/Homology/BifunctorShift.lean,Mathlib/Algebra/Homology/CochainComplexOpposite.lean,Mathlib/Algebra/Homology/CochainComplexPlus.lean,Mathlib/Algebra/Homology/CommSq.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExactSequences.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/KInjective.lean,Mathlib/Algebra/Homology/DerivedCategory/KProjective.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/DerivedCategory/TStructure.lean	1425	5	['JovanGerb', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	0-13793 3 hours ago	186-47781 186 days ago	0-13411 3 hours
39359	mathlib-splicebot author:mathlib-splicebot	fix: don't mark `continuous_sigma` as fun_prop	This is a bad `fun_prop` theorem: because of its hypotheses, this would be classified as a transition theorem, and most likely never fire. Extracted from #39337.	t-topology maintainer-merge	3/1	Mathlib/Topology/Constructions.lean	1	7	['JovanGerb', 'github-actions', 'grunweg', 'lecopivo', 'urkud']	alreadydone assignee:alreadydone	0-12196 3 hours ago	4-61804 4 days ago	4-61796 4 days

PRs with non-conforming titles

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
36503	Mrigna01 author:Mrigna01	Add false theorem test file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	135/0	Mathlib/FalseBench/FalseTheorems.lean	1	3	['github-actions']	nobody	68-18509 2 months ago	68-18599 68 days ago	68-18591 68 days
37281	AltSoKoly author:AltSoKoly	Update EdgeConnectivity.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	123/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Data/Int/GCD.lean	2	5	['github-actions', 'grunweg', 'themathqueen']	nobody	40-50786 1 month ago	52-41549 52 days ago	0-432 7 minutes
37556	edwin1729 author:edwin1729	feat(Topology/Order): Locale.localePointOfSpacePoint if we have a Scott Topology from an Algebraic DCPO	(3/4) in a series of PRs proving that "Scott Topologies over Algebraic DCPOs are Sober" We prove here that the unit of the adjunction from `TopCat` to `Locale` defined in `Topology/Order/Category/FrameAdjunction.lean` is a surjective mapping, under the following condition: The underlying TopologicalSpace must be a Scott Topology generated with an underlying Algebraic DCPO structure. - [ ] depends on: #37445 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor blocked-by-other-PR merge-conflict	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-18768 21 days ago	46-43268 46 days ago	0-1300 21 minutes
38596	JJYYY-JJY author:JJYYY-JJY	Add basic row-equivalence and echelon-form API for matrices	This PR adds the first foundational slice of `Mathlib.LinearAlgebra.Matrix.Echelon`, a theorem-oriented API for elementary row operations, row-equivalence, and echelon-form predicates for matrices. The main additions are: * elementary row-scaling matrices and their `GL` versions; * `Matrix.RowEquivalent` for the left action of `GL m R` on rectangular matrices; * row-zero, pivot, echelon, and reduced-echelon predicates; * semantic representative predicates `Matrix.IsEchelonFormOf` and `Matrix.IsReducedEchelonFormOf`. This intentionally stops before row-space characterizations, existence and uniqueness of reduced echelon representatives, and the noncomputable canonical representative `Matrix.rref`; those are planned for later PRs. Co-authored-by: Joseph Qian Co-authored-by: Veer Shukla Co-authored-by: Dhruv Bhatia Co-authored-by: Zheng Wu <1036819072@qq.com> --- This update trims the original full row-reduction API in response to reviewer feedback that the PR was too large. It keeps only the foundation needed by later row-reduction and `rref` PRs.	t-algebra new-contributor label:t-algebra$	312/6	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Echelon.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean	3	10	['JJYYY-JJY', 'SnirBroshi', 'copilot-pull-request-reviewer', 'dagurtomas', 'github-actions', 'wwylele']	nobody	5-15537 5 days ago	5-18616 5 days ago	12-80431 12 days
39229	grunweg author:grunweg	dev: towards `fun_prop` on manifolds	--- - [ ] depends on: #39226 Rebased version of #31580. Meant to be a prototype that demonstrate how this could possibly work. Not functional yet; waiting on cache to continue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	305/1	Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Tactic/FunProp/Core.lean,MathlibTest/DifferentialGeometry/FunPropM.lean,MathlibTest/fun_prop_dev.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-83489 2 days ago	7-10661 7 days ago	0-12 12 seconds
37010	pion2024 author:pion2024	`Sl2`update: add theorem `finrank_weightSpace_eq_one_of_isIrreducible`	# Background: I am a 2nd year undergrad student in mathematics currently self-teaching Lie algebra and representation theory. Before starting the formalization, I searched for related keywords on Zulip and in the GitHub issues and commits. As far as I could tell, there were no existing results or ongoing attempts before I started. All feedback is welcome. Even a quick check on the statement design/an idea on the generalization (cf Limitations below) would be incredibly helpful. # Overview In this PR, I added the new section `IsAlgClosedIrreducible` which formalizes the well-known theorem `finrank_weightSpace_eq_one_of_isIrreducible` for the Lie algebra $\mathfrak{sl}_2$ step by step. It proves that for a finite-dimensional irreducible representation of $\mathfrak{sl}_2$ over an algebraically closed field $K$ of characteristic zero, every non-trivial weight space has a dimension of exactly 1. # Formalization Structure : Instead of relying on explicit finite sums (`Finset.sum`) and manipulating coefficients, I heavily leverage Mathlib's abstractions in Submodule Lattice Theory and Coordinate-free Linear Algebra. The formalization proceeds in the following logic: 1. Existence of a Primitive Vector (`exists_primitiveVector`): I construct a primitive (highest-weight) vector by showing that repeated applications of the raising operator $e$ must eventually yield zero due to the finite-dimensionality of $M$ and the linear independence of eigenvectors corresponding to distinct eigenvalues. 2. The span of $f$-Tower as a Lie Submodule equals to the whole space (`fTowerLieSubmodule_eq_top`): I define the $f$-tower submodule as the $K$-span of $\{f^k m \mid k \in \mathbb{N}\}$. By proving its closure under the action of $f, h$, and $e$, I establish it as a Lie submodule. Since $M$ is irreducible, this submodule must be the entire space ($\top$). 3. Submodule Lattice Operations (`exists_mem_fTower_of_weightSpace_ne_bot`): To prove that every weight in $M$ is of the form $\mu_0 - 2k$, I use lattice operations (iSup, inf, and Disjoint) to avoid element-wise tracking. Since the $f$-tower spans $M$, the supremum of its weight spaces is $\top$. By leveraging `Module.End.eigenspaces_iSupIndep`, I show that any arbitrary non-trivial weight space would have a trivial intersection with $\top$ if its weight didn't belong to the sequence, yielding a contradiction. 4. Dimension Calculation via Basis Equivalence (`finrank_weightSpace_eq_one_of_isIrreducible`): Finally, I construct a basis from the non-zero elements of the $f$-tower. To show the weight space is 1-dimensional, I use `Basis.equivFun` to compare coefficients algebraically. This avoids heavy manual indexing and index-shifting, proving that any vector in the weight space $\mu_0 - 2k$ is merely a scalar multiple of $f^k m$. # Use of AI: I used Gemini 3.1 Pro for tactics, theorems, improvement suggestions, and error explanations. I fully understand and can vouch for all the modifications I have made to the file. # Limitations: I only managed to formalize the finite-dimensional version, although the theorem also holds in the infinite-dimensional case. In the infinite case the existence of a primitive vector is not guaranteed. A quick search suggests that we might need heavy tools like Casimir operators and the universal enveloping algebra, which are totally beyond my current level. I am looking into it, but since there is a significant mathematical gap, I thought it would be best to get this finite-dimensional version merged first.	new-contributor t-algebra large-import awaiting-author merge-conflict label:t-algebra$	336/0	Mathlib/Algebra/Lie/Sl2.lean	1	11	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash', 'pion2024']	ocfnash assignee:ocfnash	0-66042 18 hours ago	47-46679 47 days ago	2-57577 2 days
38937	zw810-ctrl author:zw810-ctrl	API and proof of `isStrictMap_prodMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor large-import awaiting-author merge-conflict	82/3	Mathlib/Topology/Maps/Strict/Basic.lean	1	13	['ADedecker', 'github-actions', 'mathlib-merge-conflicts', 'zw810-ctrl']	nobody	0-3162 52 minutes ago	9-6582 9 days ago	0-101 1 minute

PRs without an area label

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
36275	smmercuri author:smmercuri	feat: norm for the finite adele ring of a number field	--- - [ ] depends on: #35820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	176/0	Mathlib.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	72-81626 2 months ago	73-49787 73 days ago	0-8 8 seconds
30579	smmercuri author:smmercuri	feat : `v.adicCompletionIntegers K` is compact when `K` is a number field	--- - [x] depends on: #30576 - [x] depends on: #33484 - [x] depends on: #33594 - [ ] depends on: #34045 - [x] depends on: #36067 - [x] depends on: #36137 - [x] depends on: #36184 - [x] depends on: #36492 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	362/11	Mathlib.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/LiesOverInstances.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	9	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	72-20390 2 months ago	215-58298 215 days ago	0-13 13 seconds
35991	xroblot author:xroblot	feat(RamificationInertia): decomposition field and inertia field of compositum	--- - [ ] depends on: #35808 - [x] depends on: #35493 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict large-import	645/36	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean	9	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	68-23801 2 months ago	77-43202 77 days ago	0-316 5 minutes
34911	smmercuri author:smmercuri	feat: idelic product formula	--- - [x] depends on: #34915 - [x] depends on: #34918 - [x] depends on: #36184 - [x] depends on: #36204 - [ ] depends on: #36275 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	262/2	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/FiniteAdeleRing.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	8	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	65-46138 2 months ago	101-62814 101 days ago	0-10 10 seconds
36404	smmercuri author:smmercuri	feat: the adele ring of a number field is locally compact	--- - [ ] depends on: #30579 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import merge-conflict	539/113	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/NumberTheory/NumberField/LiesOverInstances.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	10	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	58-72595 1 month ago	70-39745 70 days ago	0-264 4 minutes
36733	xroblot author:xroblot	feat(RamificationInertia): decomposition field and inertia field of subfields	If `D` (resp. `E`) is the decomposition (resp. inertia) field of `P` in `L/K` and `F` is a subextension, then the decomposition (resp. inertia) field of the prime of `F` below `P` in `F/K` is` D ⊓ F` (resp. `E ⊓ F`). --- - [ ] depends on: #36544 - [ ] depends on: #35991 - [x] depends on: #36391. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	818/31	Mathlib.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean,Mathlib/RingTheory/Ideal/Galois.lean	13	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	38-23344 1 month ago	63-51759 63 days ago	0-48 48 seconds
38036	JovanGerb author:JovanGerb	feat: `NSMul`/`NPow` type class	This PR is adds `NSMul`, `NPow`, `ZSMul` and `ZPow` classes for the `nsmul`, `npow`, `zsmul`, `zpow` data fields. This has a few advantages: - If you first declare a `SMul` instance, then you don't need to manually write `nsmul := (· • ·)` and `zsmul := (· • ·)` . For `Pow`, the extra benefit is that inferring the instance is preferred over the default field `npowRecAuto`. So this helps avoid accidental diamonds. - If you first declare a `SMul` instance on a type synonym, then `inferInstanceAs` will infer the `nsmul` field from the `SMul` instance. This makes it easier to avoid diamonds on type synonyms like `Matrix` and `MonoidAlgebra`. - The not-yet-merged instance diamond linter will be able to detect cases where the `NSMul` and `SMul` classes do not agree. In the process of making this PR, I have identified two existing `NPow` diamonds: - In `Mathlib.Algebra.Order.Positive.Field`, there were two conflicting `NPow` instances. - For `Fin`, there are two conflicting `NPow` instances. I have overwritten the one in core lean with the one from mathlib that is more computationally efficient. TODO: the same for `QSMul` and `NNQSMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		276/273	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Action/Opposite.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/TypeTags/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Opposite.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/LinearAlgebra/Matrix/Defs.lean,Mathlib/LinearAlgebra/Matrix/ZPow.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Topology/Algebra/GroupCompletion.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,MathlibTest/instance_diamonds.lean	41	16	['JovanGerb', 'eric-wieser', 'github-actions', 'jcommelin', 'leanprover-radar', 'vihdzp']	nobody	27-53274 27 days ago	27-54166 27 days ago	27-54448 27 days
38193	Jun2M author:Jun2M	feat(Topology/Algebra/InfiniteSum): Deprecate generalized ENNReal lemmas	Following the PR #38489, this PR add deprecated tags to the original `ENNReal` lemmas and change the transitive children files to use the generalized lemmas rather than the deprecated lemmas. Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615) --- - [ ] depends on: #38489 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	483/329	Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Analysis/Normed/Group/InfiniteSum.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEMeasurableOrder.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/LpSpace/Complete.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Measure/AddContent.lean,Mathlib/MeasureTheory/Measure/Content.lean,Mathlib/MeasureTheory/Measure/Count.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasuredSets.lean,Mathlib/MeasureTheory/Measure/MutuallySingular.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Stieltjes.lean,Mathlib/MeasureTheory/Measure/Tight.lean,Mathlib/MeasureTheory/Measure/Typeclasses/SFinite.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean,Mathlib/MeasureTheory/OuterMeasure/Caratheodory.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/MeasureTheory/OuterMeasure/OfAddContent.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/MeasureTheory/OuterMeasure/Operations.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/NumberTheory/Transcendental/Liouville/Measure.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/WithDensity.lean,Mathlib/Probability/ProbabilityMassFunction/Basic.lean,Mathlib/Probability/ProbabilityMassFunction/Constructions.lean,Mathlib/Probability/ProbabilityMassFunction/Monad.lean,Mathlib/Probability/Process/LocalProperty.lean,Mathlib/Topology/Algebra/InfiniteSum/ENNReal.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Semicontinuity/Basic.lean	52	4	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	22-35664 22 days ago	24-16308 24 days ago	6-13863 6 days
38567	dagurtomas author:dagurtomas	feat(CategoryTheory/Monoidal): autogenerate some lemmas instead of stating them explicitly	--- - [ ] depends on: #38482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	928/166	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Limits/HasLimits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean,Mathlib/CategoryTheory/Monoidal/PushoutProduct.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,Mathlib/Tactic/CategoryTheory/Op.lean,Mathlib/Tactic/CategoryTheory/SpecializeMap.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/Op.lean,MathlibTest/CategoryTheory/SpecializeMap.lean	12	2	['github-actions', 'mathlib-dependent-issues']	nobody	21-47750 21 days ago	21-86241 21 days ago	0-512 8 minutes
37910	wwylele author:wwylele	feat(Geometry/Euclidean): volume of a simplex	This defines the volume of a simplex in Euclidean geometry, and shows that it agrees with measure theory. It also adds the basic set of lemmas (base-and-height formula, reindex, positivity, map, and restrict). Further properties of the volume will be in future PRs. Three new file s are introduced and organized in the following dependency chain: Def.lean -> MeasureSimplex.Lean -> Basic.lean The Def.lean file has the definition only. MeasureSimplex.lean pulls in measure theory. Basic.lean publicly imports Def.lean, and privately imports MeasureSimplex.lean. When a downstream file imports Basic.lean, the measure theory part is not exposed and all properties of the volume is provided. --- - [ ] depends on: #36018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	614/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Volume/Basic.lean,Mathlib/Geometry/Euclidean/Volume/Def.lean,Mathlib/Geometry/Euclidean/Volume/MeasureSimplex.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	21-35846 21 days ago	38-21825 38 days ago	0-473 7 minutes
37073	kim-em author:kim-em	feat: add wrap_instance% using core's wrapInstance	This PR adds a new `wrap_instance%` term elaborator that delegates to Lean core's `wrapInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `wrap_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.wrapInstance`. Like `fast_instance%`, it reduces instances to constructor applications and reuses canonical sub-instances. Unlike `fast_instance%`, it works at `instances` transparency and delegates all normalization logic to core. The replaced sites cover: - Equiv/type-alias transfers (WithAbs, WithConv, WithVal, WithLp, TransferInstance) - Surjective constructors (Con, RingCon quotients, module congruences) - DFunLike leaf instances (MultilinearMap, ContinuousMultilinearMap, AlternatingMap, Intertwining) - Quotient instances (LinearAlgebra/Quotient/Defs) - inferInstanceAs% sites (StandardPart, Presentation/Core) - Miscellaneous (InfiniteAdeleRing, ZMod) This PR doesn't attempt to replace all `fast_instance%`; it gets more complicated! 🤖 Prepared with Claude Code		88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/WithConv.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/RepresentationTheory/Intertwining.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	16	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	20-5822 20 days ago	20-5849 20 days ago	22-79349 22 days
38316	tannerduve author:tannerduve	feat(Order/OmegaCompletePartialOrder): least fixed point and Scott induction	Adds `ContinuousHom.lfp` for endomorphisms on an ωCPO with `⊥`, as the `ωSup` of the iterate chain from `⊥`, together with `map_lfp`, `isFixedPt_lfp`, `lfp_le_fixed`, `isLeast_lfp`, and the Scott induction theorem `lfp_induction` (specialized from a more general seed-based `ωSup_iterate_induction`). For `Part.fix`, adds: * `Part.exists_mem_approx_of_mem_fix`: if `y ∈ Part.fix g x`, some finite approximation of `g` already contains `y`. * `Part.Fix.approx_eq_iterate_bot` and `Part.Fix.approxChain_eq_iterateChain`: bridges between `Fix.approx`/`approxChain` and `f^[n] ⊥`/`iterateChain`. * `Part.fix_eq_lfp`: `Part.fix g = ContinuousHom.lfp (.ofFun g hc)` when `g` is ω-Scott continuous. * `Part.fix_scott_induction`: Scott induction specialized to `Part.fix`. * `Part.fix_induction_mem`: membership induction on `Part.fix`, derived from `fix_scott_induction`.	new-contributor	114/0	Mathlib/Control/LawfulFix.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,docs/references.bib	3	2	['github-actions']	nobody	16-38041 16 days ago	28-14143 28 days ago	28-14661 28 days
37023	xroblot author:xroblot	feat(NumberTheory/NumberField): linear disjointness from coprime discriminants	The key new result is `dvd_discr_iff_dvd_discr_normalClosure`: a prime `p` divides `discr K` if and only if it divides the discriminant of the normal closure of `K` over `ℚ`. Thanks to this result, we generalize `linearDisjoint_of_isGalois_isCoprime_discr` by removing the Galois hypothesis: if K₁ and K₂ are number fields with coprime discriminants, then they are linearly disjoint over ℚ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #36843 - [ ] depends on: #30666	merge-conflict blocked-by-other-PR	1575/57	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/TransferInstance.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Galois/IsGaloisGroup.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IntermediateField/ExtendTop.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/QuotientGroup/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/NumberTheory/RamificationInertia/HilbertTheory.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Ideal/Galois.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	24	1	['mathlib-dependent-issues']	nobody	11-35636 11 days ago	56-72885 56 days ago	0-83 1 minute
38837	kbuzzard author:kbuzzard	feat: add "higher instance priority" library note	We add a library note explaining the logic in making instances like `Semiring.toModule` higher priority than the default. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #38704 [only because one of the claims in the note is false without it]		19/0	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Module/Defs.lean	4	5	['github-actions', 'kbuzzard', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-33641 8 days ago	8-33415 8 days ago	9-20178 9 days
38489	Jun2M author:Jun2M	feat(Topology/Algebra/InfiniteSum): Generalize ENNReal lemmas	This PR generalizes many theorems in Topology/Algebra/InfiniteSum/ENNReal.lean from `ENNREal` to any type that satisfies a list of order-related instances, mostly `[CommMonoid α] [CompleteLattice α] [CanonicallyOrderedMul α] [TopologicalSpace α] [SupConvergenceClass α]` Deprecation of the original `ENNReal` lemmas are done in the next PR: #38193. Related Zulip thread: [#Is there code for X? > Summing `ENat`s without topology](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Summing.20.60ENat.60s.20without.20topology/with/588756615) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		261/3	Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean	4	7	['Jun2M', 'SnirBroshi', 'github-actions', 'wwylele']	nobody	8-25022 8 days ago	8-25099 8 days ago	24-15136 24 days
39163	j-loreaux author:j-loreaux	feat: `star` structures on `ContinuousLinearMapWOT`	In particular, with these instances it makes sense to consider the `StarSubalgebra.topologicalClosure` of some `S : StarSubalgebra 𝕜 (F →WOT[𝕜] F)`. --- - [ ] depends on: #37914 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	157/4	Mathlib.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/TransferInstance.lean,Mathlib/Analysis/InnerProductSpace/WeakOperatorTopology.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	8-3790 8 days ago	8-3790 8 days ago	0-405 6 minutes
39157	vihdzp author:vihdzp	feat: `Nat.cast` commutes with addition	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		26/9	Mathlib/Data/Nat/Cast/Commute.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	2	['github-actions', 'plp127']	nobody	7-52704 7 days ago	8-27769 8 days ago	8-27761 8 days
39233	linesthatinterlace author:linesthatinterlace	feat: `Pi.map` rename to `Function.map`	This PR renames `Pi.map` to `Function.map` and makes the changes necessary to support this. In particular this means that Mathlib.Logic.Function.Defs now only contains the Function namespace. Zulip thread: [#PR reviews > #39233 - rename Pi.map to Function.map @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2339233.20-.20rename.20Pi.2Emap.20to.20Function.2Emap/near/594605689) General discussion regarding the Pi namespace: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20Pi.20namespace/near/594782721 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	131/122	Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Regular/Pi.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Control/Bifunctor.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Dynamics/Ergodic/MeasurePreserving.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Filter/Pi.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/Topology/Algebra/FilterBasis.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Algebra/RestrictedProduct/TopologicalSpace.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/NhdsWithin.lean	37	1	['github-actions']	nobody	5-72808 5 days ago	6-47487 6 days ago	0-7302 2 hours
38606	dennj author:dennj	feat: preparation for Vanishing Sum of Roots of Unity	Adds the Mathlib API extensions needed for an upcoming formalization of the Lam-style classification theorem for vanishing sums of roots of unity. * Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean + `exists_eq_const_of_sum_smul_eq_zero_of_sum_eq_zero_of_linearIndependent`: if `∑ vᵢ = 0` and the first `n-1` of `n` vectors are linearly independent, every linear relation has constant coefficients. * Mathlib/RingTheory/Radical/NatInt.lean + `Nat.totient_eq_div_radical_mul_totient_radical`: Euler's totient splits as `φ(n) = (n / rad n) * φ(rad n)`. * Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean + `IsPrimitiveRoot.sum_range_pow_mul_div_eq_zero_of_dvd`: the `d` evenly-spaced powers of a primitive `k`-th root sum to zero, for `d ∣ k` and `1 < d`. * Mathlib/NumberTheory/Cyclotomic/LinearDisjoint.lean (new) + `IsPrimitiveRoot.linearDisjoint_adjoin_pow_of_coprime`: cyclotomic subfields of coprime orders are linearly disjoint over `ℚ`. * Mathlib/NumberTheory/Cyclotomic/LinearRelations.lean (new) + `IsPrimitiveRoot.coeffs_eq_of_sum_pow_eq_zero_prime_coprime`: in the cyclotomic field of order `p * m` with `p` prime coprime to `m`, any `ℚ⟮ζ^p⟯`-linear relation among powers of `ζ^m` has all coefficients equal. --- I need these as preparation to start formalizing the theorem: Let k be a positive integer. If a finite family of complex k-th roots of unity sums to zero, then the size of the family is a non-negative integer combination of the prime divisors of k. --- Human-made PR with AI used for golfing and documentation	new-contributor	219/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/NumberTheory/Cyclotomic/LinearDisjoint.lean,Mathlib/NumberTheory/Cyclotomic/LinearRelations.lean,Mathlib/RingTheory/Radical/Totient.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	6	3	['github-actions', 'mathlib-merge-conflicts']	nobody	5-48436 5 days ago	5-26605 5 days ago	8-31594 8 days
39279	jayscambler author:jayscambler	feat(Cryptography/Sigma): Schnorr sigma protocol and signature scheme	Adds `Mathlib/Cryptography/Sigma/Schnorr.lean`. New file in a new top-level directory; mathlib currently has no `Mathlib/Cryptography/`, so I've taken `Mathlib/Cryptography/Sigma/` as the natural home for sigma-protocol formalizations. The file proves the three defining properties of Schnorr's identification scheme as a sigma protocol: - `Schnorr.correct`: completeness. Honest verifier accepts honest signer's transcript. - `Schnorr.specialSoundness`: from two accepting transcripts sharing the commitment but using different challenges `c, c'`, the witness `x = (s - s') / (c - c')` is recovered. Needs `q` prime so `c - c'` is invertible in `ZMod q`. - `Schnorr.hvzkAccepts`: the HVZK simulator `g^s · (y^c)⁻¹` always yields accepting transcripts. This is the structural-correctness half of HVZK only; the distributional indistinguishability statement is a separate result and not in this PR. On top of the sigma protocol there's `Schnorr.Signature.{keyGen, sign, verify, correct}` wrapping it as a Fiat-Shamir signature scheme; `Schnorr.Signature.correct` is a one-line corollary of `Schnorr.correct`. Two auxiliary lemmas, `Schnorr.gpow_sub` and `Schnorr.gpow_mul`, bridge `ZMod q` arithmetic and group exponentiation under `Fintype.card G = q`. They're local to this file for now because the surrounding `gpow` API is itself cryptography-specific; if a general `ZMod q`-graded group action framework lands in mathlib later, both lemmas would become instances of it. There's also a small `example` instantiating everything on `Multiplicative (ZMod q)` for `Fact q.Prime` to show the API typechecks. That instantiation is a toy (DLOG is trivial in that group), but it confirms the abstraction is usable. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	352/0	Mathlib.lean,Mathlib/Cryptography/Sigma/Schnorr.lean	2	2	['github-actions']	nobody	5-45788 5 days ago	5-45867 5 days ago	5-46349 5 days
38472	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): The Weil divisor associated to an element of the function field on a locally Noetherian integral scheme	In this PR we define and provide some basic API for principal Weil divisors, i.e. the Weil divisor associated to an element of the function field of a locally noetherian, integral scheme. - [ ] depends on: #29774 - [ ] depends on: #37985 - [ ] depends on: #37901 - [ ] depends on: #38002 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	713/0	Mathlib.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Basic.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle/Principal.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/Minimal.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean,Mathlib/Topology/Sober.lean	11	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-70461 4 days ago	24-47211 24 days ago	0-1194 19 minutes
39139	or4nge19 author:or4nge19	feat(LinearAlgebra): Schur triangulation	Adds Schur triangulation API for algebraically closed `RCLike`, proved by triangularizing an endomorphism, aiming at a more mathlib idiomatic approach than the original one in #20730 as it now (better) specializes the existing triangularization API and generalizes supporting lemmas in more natural places. A prerequisite for porting `Matrix.det_exp` proof from physlib. It also proves half of existing TODO in Eigenspace.Triangularizable. It may need a split into 2 PRs and coordination with #37006 . See [this](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Contribute.20Schur.20decomposition/with/532385359) and [this](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/.28Matrix.20and.20NormedSpace.2Eexp.29.20.7C.20det.20.28exp.20A.29.20.3D.20exp.20.28trace.20A.29/with/581264603) zulip discussions. Co-authored-by: [kuotsanhsu](https://github.com/kuotsanhsu) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-author	687/75	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean,Mathlib/Analysis/InnerProductSpace/Triangularizable.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Basis/Flag.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Basic.lean,Mathlib/LinearAlgebra/Matrix/SchurTriangulation.lean	10	4	['dagurtomas', 'github-actions', 'or4nge19', 'wwylele']	nobody	4-41294 4 days ago	4-41294 4 days ago	4-23931 4 days
39371	fpvandoorn author:fpvandoorn	feat: tag lemmas with compactness and closedness	--- - [ ] depends on: #39370 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	190/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	13	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-33122 4 days ago	4-47393 4 days ago	0-1 1 second
39382	fpvandoorn author:fpvandoorn	feat: add some lemmas that closures of some sets are compact	* Also tag them with `closedness`/`compactness`. * This can be refactored to use `RelativelyCompact` once we define that notion. * Note: this is only equivalent to `IsBounded` in `ProperSpace`. It is equivalent to `@IsBounded _ (inCompact X) s` in a T2-space, but the latter thing is cumbersome to write. --- - [ ] depends on: #39371 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	265/11	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/GrindAttrs.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/Order/Compact.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,MathlibTest/Compactness.lean	14	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-29033 4 days ago	4-43133 4 days ago	0-359 5 minutes
39392	jayscambler author:jayscambler	feat(Cryptography): one-time pad and Shannon perfect secrecy	Adds `Mathlib/Cryptography/OTP.lean`. One-time pad over an arbitrary finite abelian group `G`: - `OTP.encrypt k m := m + k`, `OTP.decrypt k c := c - k`. - `OTP.correct`: `decrypt k (encrypt k m) = m`, by `abel`. - `OTP.perfect_secrecy`: for any `m₀, m₁`, the distributions of `encrypt k m₀` and `encrypt k m₁` over uniform `k` are equal; both reduce to `PMF.uniformOfFintype G`. Proof goes via `Equiv.addLeft`. Independent of the Schnorr PR (#39279); no shared definitions. Unlike everything else likely to live under `Mathlib/Cryptography/`, the security guarantee here is information-theoretic, not computational. AI disclosure: this PR was a collaboration between myself, Grey Haven's autocontext and Claude Opus 4.7 (Anthropic). I read each line and built locally on current master. (strawberry has three r's)	new-contributor LLM-generated	76/0	Mathlib.lean,Mathlib/Cryptography/OTP.lean	2	3	['MrBrain295', 'github-actions']	nobody	4-8340 4 days ago	4-30814 4 days ago	4-30806 4 days
39205	ooovi author:ooovi	feat(Geometry/Convex): Bundled convex set	Add a bundled version of `IsConvexSet`. --- Once the dependencies are merged, this PR only changes `Mathlib.Geometry.Convex.Set` and `Mathlib.Geometry.Convex.Hull`, at the bottom of the file, adding `ConvexSet` and everything in the corresponding namespace. - [ ] depends on: #38934 - [ ] depends on: #38905 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR merge-conflict	989/172	Mathlib.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Geometry/Convex/ConvexSpace/AffineSpace.lean,Mathlib/Geometry/Convex/ConvexSpace/Defs.lean,Mathlib/Geometry/Convex/Hull.lean,Mathlib/Geometry/Convex/README.md,Mathlib/Geometry/Convex/Set.lean	8	6	['github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-49512 3 days ago	unknown	0-0 0 seconds
38551	TTony2019 author:TTony2019	feat(Analysis/Convex/Intrinsic): add `affineSpan_prod_eq` and `intrinsicInterior_prod_eq`	### Summary We prove that the affine span of a product set equals the product of the affine spans, and that the intrinsic interior of a product set equals the product of the intrinsic interiors. - `affineSpan_prod_eq`: for `s : Set P₁` and `t : Set P₂`, `affineSpan k (s ×ˢ t) = (affineSpan k s) ×ˢ (affineSpan k t)` as sets. - `intrinsicInterior_prod_eq`: for `s : Set P` and `t : Set Q`, `intrinsicInterior 𝕜 (s ×ˢ t) = intrinsicInterior 𝕜 s ×ˢ intrinsicInterior 𝕜 t`. These two theorems are added to `Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean` and `Mathlib/Analysis/Convex/Intrinsic.lean`. ### Collaboration Co-authored-by: @imathwy	new-contributor	144/0	Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean,Mathlib/LinearAlgebra/Prod.lean	5	22	['TTony2019', 'github-actions', 'wwylele']	nobody	2-45663 2 days ago	20-8029 20 days ago	22-38294 22 days
39202	FordUniver author:FordUniver	feat(Analysis/Calculus/Gradient): add toDual_gradient and companions	Add `toDual_gradient`, `toDual_gradientWithin`, and the composed variants `toDual_comp_gradient`, `toDual_comp_gradientWithin` — the natural inverse direction of the gradient's defining equation `∇ f x := (toDual 𝕜 F).symm (fderiv 𝕜 f x)`. These identify `(toDual 𝕜 F) (∇ f x)` with `fderiv 𝕜 f x` (and the `gradientWithin` and composed forms with the corresponding fderiv versions), making the Riesz isomorphism between the two derivative views explicit. The proofs of `DifferentiableAt.hasGradientAt` and `DifferentiableWithinAt.hasGradientWithinAt` in the same file are simplified to use them. --- Came up while formalizing the descent lemma for Lipschitz-smooth functions, where being able to switch between `LipschitzWith K (fderiv ℝ f)` and `LipschitzWith K (∇ f)` is helpful, which with this PR becomes `toDual_comp_gradient ▸ (toDual ℝ F).isometry.lipschitzWith_iff K`. Also slightly simplifies two call sites in mathlib.	maintainer-merge	20/5	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	5	['FordUniver', 'Komyyy', 'github-actions']	nobody	1-17455 1 day ago	7-51215 7 days ago	7-51371 7 days
35560	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Corollaries of Cohen Structure Theorem	Corollaries of Cohen structure theorem, saying that complete local ring can be represented as quotient of regular local ring. --- - [ ] depends on: #28683 - [ ] depends on: #35561 - [ ] depends on: #39289 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	3197/177	Mathlib.lean,Mathlib/Algebra/Category/Ring/FilteredColimitsLocal.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/FieldTheory/TranscendentalSeparable.lean,Mathlib/RingTheory/AdicCompletion/LocalRing.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/CohenStructureTheorem.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Flat/Extension.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/Nilpotent/GeometricallyReduced.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean,Mathlib/RingTheory/Smooth/Field.lean	20	10	['BryceT233', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-57760 16 hours ago	87-78046 87 days ago	0-8 8 seconds
35790	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory/AlgebraicGeometry): Flasque Sheaves have vanishing cohomology	Proves cohomology vanishing for flasque sheaves. --- - [x] depends on: #34742 - [x] depends on: #34267 - [x] depends on: #35785 - [ ] depends on: #36218 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	367/2	Mathlib.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.lean,Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/ExactSequences.lean,Mathlib/Topology/Sheaves/AddCommGrpCat.lean,Mathlib/Topology/Sheaves/Flasque.lean,Mathlib/Topology/Sheaves/Sheaf.lean	8	10	['Brian-Nugent', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smorel394']	dagurtomas assignee:dagurtomas	0-19730 5 hours ago	82-13525 82 days ago	0-23 23 seconds

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