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: April 06, 2026 at 20:25 UTC

Overall statistics

Found 2334 open PRs overall. Among these PRs

397 (17.0%) are awaiting review (these ones), among these 78 (19.0%) by new contributors (these ones)
300 (12.9%) are blocked on another PR
195 (8.4%) are awaiting the PR author's action
165 (7.1%) have a merge conflict: among these, 127 (77.0%) would be ready for review otherwise: these
24 (1.0%) are labelled help-wanted or please-adopt (roughly these)
677 (29.0%) are marked as draft or work in progress
16 (0.7%) are awaiting the outcome of a zulip discussion (these ones)
549 (23.5%) are opened from mathlib's main repo and need migration to a fork (these ones)
1 (0.0%) have contradictory labels (these ones)
9 (0.4%) 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: 1 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
34969	kim-em author:kim-em	feat(RingTheory/HopfAlgebra): prove antipode is antihomomorphism	This PR proves that the antipode of a Hopf algebra is an antihomomorphism: `antipode (a * b) = antipode b * antipode a`. The proof uses the convolution algebra structure on `(A ⊗ A) →ₗ[R] A` and shows that `S ∘ μ` and `μ ∘ (S ⊗ S) ∘ comm` are both convolution inverses of `μ`, hence they must be equal by uniqueness of inverses. This resolves a TODO listed in the file header. 🤖 Prepared with Claude Code	t-ring-theory LLM-generated delegated ready-to-merge	85/3	Mathlib/RingTheory/HopfAlgebra/Basic.lean	1	18	['YaelDillies', 'github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	4-49670 4 days ago	14-46231 14 days ago	42-13893 42 days

24 PRs are waiting on maintainer approval (these), of which 14 have not been updated in a day (these)

26 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	305-27075 10 months ago	305-27966 305 days ago	0-10787 2 hours
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	172-3179 5 months ago	193-35269 193 days ago	3-79002 3 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	157-24768 5 months ago	236-40303 236 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	143-34770 4 months ago	297-21050 297 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	93-68484 3 months ago	221-12597 221 days ago	43-1605 43 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	54-49877 1 month ago	116-45922 116 days ago	15-82816 15 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	47-74968 1 month ago	139-40737 139 days ago	24-84527 24 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	38-68404 1 month ago	40-76893 40 days ago	11-35673 11 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	181/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	35-14838 1 month ago	168-14565 168 days ago	0-22513 6 hours
35436	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Monoidal/Closed): Prove the isomorphism of internal hom objects C(x \otimes y, z) and C(y, C(x, z))	Prove the currying-uncurrying isomorphism `C(x \otimes y, z) \iso C(y, C(x, z))` between internal hom objects of a closed monoidal category `C`. --- This result is connected to the infinity-cosmos project, and is used to prove that a closed monoidal category enriched in itself admits all cotensors. ~Line 81 currently contains a one-line proof in tactics mode `exact rfl`. When trying to use `rfl` outside of tactics mode, an error is thrown~ (Fixed, thank you @robin-carlier!). Any help with this (or any other aspect of the formalization) is greatly appreciated! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos delegated	89/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Closed/InternalCurrying.lean	2	15	['dagurtomas', 'daniel-carranza', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	adamtopaz assignee:adamtopaz	31-5394 1 month ago	38-79933 38 days ago	7-67484 7 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	21-18851 21 days ago	89-70201 89 days ago	0-7055 1 hour
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	19-12066 19 days ago	74-19846 74 days ago	54-22055 54 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	18-31160 18 days ago	44-80770 44 days ago	0-114 1 minute
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	420/387	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	187	14	['github-actions', 'j-loreaux', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-1207 14 days ago	143-78535 143 days ago	0-1 1 second
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	235/169	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	63	11	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	12-45602 12 days ago	269-21650 269 days ago	2-53782 2 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	10-80609 10 days ago	11-6642 11 days ago	0-588 9 minutes
35555	JovanGerb author:JovanGerb	perf: add `AddMonoid` shortcut instance for linear maps	The hierarchy of classes is such that `AddCommMonoid` is not a direct parent of `AddCommGroup`. This means that when unifying an instance that comes from `AddCommMonoid` with one that comes from `AddCommGroup`, we end up having to go through the shared parent `AddMonoid`. Hence, it can be beneficial to have a separately defined `AddMonoid` instance. It might be worth it to try to switch up the order of the parents of `AddCommGroup`/`CommGroup` in the `extends` clause, and see if that has beneficial effects. Though this will affect many things, and in particular won't interact well with the `backward.respectTransparency` mess that is going on at the moment. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	22/7	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean	4	11	['JovanGerb', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'mattrobball', 'robin-carlier']	robin-carlier assignee:robin-carlier	10-20620 10 days ago	10-43101 10 days ago	10-30622 10 days
37060	pfaffelh author:pfaffelh	feat: `Set.indicator` on a disjoint union equals the sum of individual `Set.indicator`	Prove a helper lemma on mulIndicators, needed in measure/probability theory: If `s : γ → Set β` is `Pairwise (Disjoint on s)` and `f : β → α`, then `(⋃ d, s d).mulIndicator f i = ∏' d, (s d).mulIndicator f i` for `i : β`. The `to_additive` tag is added for `Set.indicator`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	57/1	Mathlib/Algebra/Group/Indicator.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	2	30	['DavidLedvinka', 'github-actions', 'mathlib-bors', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	6-36340 6 days ago	6-36340 6 days ago	7-13173 7 days
36072	erdOne author:erdOne	feat(AlgebraicGeometry): essential smallness of affine schemes locally of finite type over a base	Co-authored-by: Joël Riou --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated awaiting-author	151/2	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	6	7	['WilliamCoram', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca']	nobody	6-26167 6 days ago	32-16590 32 days ago	1-79945 1 day
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	5-12029 5 days ago	5-12029 5 days ago	0-2151 35 minutes
34969	kim-em author:kim-em	feat(RingTheory/HopfAlgebra): prove antipode is antihomomorphism	This PR proves that the antipode of a Hopf algebra is an antihomomorphism: `antipode (a * b) = antipode b * antipode a`. The proof uses the convolution algebra structure on `(A ⊗ A) →ₗ[R] A` and shows that `S ∘ μ` and `μ ∘ (S ⊗ S) ∘ comm` are both convolution inverses of `μ`, hence they must be equal by uniqueness of inverses. This resolves a TODO listed in the file header. 🤖 Prepared with Claude Code	t-ring-theory LLM-generated delegated ready-to-merge	85/3	Mathlib/RingTheory/HopfAlgebra/Basic.lean	1	18	['YaelDillies', 'github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	4-49670 4 days ago	14-46231 14 days ago	42-13893 42 days
37229	b-mehta author:b-mehta	feat(Algebra/Free): relate the free semigroup and the free monoid	The name is picked to mimic `FreeMagma.toFreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	100/3	Mathlib.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/FreeSemigroup.lean	3	9	['adomani', 'b-mehta', 'dagurtomas', 'github-actions', 'mathlib-bors']	dagurtomas assignee:dagurtomas	4-1663 4 days ago	4-2684 4 days ago	7-8497 7 days
36386	SnkXyx author:SnkXyx	feat(Algebra/MvPolynomial/Degrees): add some lemmas about `degreeOf`	These lemmas are used in #36103 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	86/0	Mathlib/Algebra/MvPolynomial/Degrees.lean	1	19	['Hagb', 'SnkXyx', 'dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'riccardobrasca']	dagurtomas assignee:dagurtomas	2-28250 2 days ago	2-30409 2 days ago	24-61135 24 days
36901	chrisflav author:chrisflav	chore(CategoryTheory/MorphismProperty): dualise `MorphismProperty.mapOverAdjunction`	From Pi1. --- - [x] depends on: #36900 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory delegated	159/20	Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean	1	7	['dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'riccardobrasca']	joelriou assignee:joelriou	2-22593 2 days ago	2-22594 2 days ago	2-25631 2 days
37451	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017307958) by @dagurtomas.	t-category-theory delegated	21/0	Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean	1	10	['erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	robin-carlier assignee:robin-carlier	2-14293 2 days ago	2-14521 2 days ago	3-82227 3 days
37452	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/Condensed/Light/Epi.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017308832) by @dagurtomas.	t-condensed delegated	19/0	Mathlib/Condensed/Light/Epi.lean	1	3	['github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1-44647 1 day ago	1-44647 1 day ago	4-52097 4 days

Review status

There are currently 411 PRs awaiting review. Among these,

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

On the other hand, 86 PRs are unassigned and have not seen a status change in three days, and 27 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
36443	Fieldnote-Echo author:Fieldnote-Echo	feat(Combinatorics/SimpleGraph): add SimpleGraph.ball (open metric ball)	Add `SimpleGraph.ball`, the open ball in the graph extended metric. ## Design decisions - Open ball (strict `<`, not `≤`): `ball c ⊤` coincides with the connected component of `c`, whereas a closed ball would give `closedBall c ⊤ = univ`. - Named `SimpleGraph.ball` (not `eball`): since `dist`-valued balls are less natural for disconnected graphs, the `e` prefix is unnecessary. - Graph-specific (not via `PseudoEMetricSpace`): avoids importing `ℝ`. AI assistance: Claude (Opus 4.6) helped draft and iterate on the implementation. I reviewed the code line by line and vouch for the final contents. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/SimpleGraph.20metric.20balls/with/577846803). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	59/3	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	36	['Fieldnote-Echo', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'lauramonk', 'vlad902']	nobody	1	21-19032 21 days ago	27-17544 27 days ago	27-17534 27 days
36786	SproutSeeds author:SproutSeeds	feat(DoubleCounting): parity of odd-degree vertices in bipartite incidence	Adds `odd_card_filter_odd_bipartiteAbove_iff_odd_card_filter_odd_bipartiteBelow` to `Mathlib.Combinatorics.Enumerative.DoubleCounting`. This is the small parity-helper first step for #25231. Validation: - `lake build Mathlib.Combinatorics.Enumerative.DoubleCounting` Supersedes closed #36077 after replaying the helper cleanly on current `master`. AI usage: used Codex for branch recovery, replay onto current `master`, and draft wording; final code choices and verification by me.	new-contributor t-combinatorics large-import	17/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean	1	2	['github-actions']	nobody	none	19-64391 19 days ago	19-64474 19 days ago	19-64464 19 days
34797	vlad902 author:vlad902	feat(SimpleGraph): `cycleGraph.cycle` is a cycle	(A follow-up PR will show that `cycleGraph.cycle` is also hamiltonian.) --- - [x] depends on: #35360 - [x] depends on: #34766 - [x] depends on: #34796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	32/1	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	none	16-12978 16 days ago	18-9381 18 days ago	19-38290 19 days
35414	joneugster author:joneugster	feat(Cache): Allow arguments of the form `Mathlib.Data.+` which correspond to a folder but not a file	This PR continues the work from #21838. Original PR: https://github.com/leanprover-community/mathlib4/pull/21838	CI t-meta	74/31	Cache/IO.lean,Cache/Main.lean	2	2	['github-actions', 'joneugster']	nobody	none	15-69912 15 days ago	49-13089 49 days ago	49-13079 49 days
35655	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): strongly regular graphs have diameter 2	A strongly regular graph with positive `μ` must have diameter 2, as long as the vertex set is nontrivial and it is not complete. --- - [x] depends on: #35657 This statement is useful in the literature, I wanted to add it after seeing it being used in the proof of the Hoffman-Singleton theorem. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	18/0	Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	14-84752 14 days ago	14-86351 14 days ago	15-15459 15 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	156/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	3	5	['b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner']	nobody	none	14-39775 14 days ago	14-39840 14 days ago	14-45411 14 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/)		4/21	Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Tactic/NormNum/DivMod.lean	4	1	['github-actions']	nobody	none	14-4455 14 days ago	14-4525 14 days ago	14-4515 14 days
36693	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): * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 * `Filter.hasBasis_biInf_of_directed'`: 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/)		2/15	Mathlib/GroupTheory/Perm/Support.lean,Mathlib/Order/Filter/Bases/Basic.lean	2	1	['artie2000', 'github-actions']	nobody	1	13-73092 13 days ago	22-807 22 days ago	22-797 22 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	1	['artie2000', 'github-actions']	nobody	1	13-72360 13 days ago	20-11770 20 days ago	20-11760 20 days
37109	zeekmartin author:zeekmartin	feat(SimpleGraph): card of common neighbors equals card of triangles containing edge	Adds `SimpleGraph.card_commonNeighbors_eq_card_triangles_containing_edge` to `Mathlib/Combinatorics/SimpleGraph/Clique.lean`. For adjacent vertices `u v` in a finite simple graph, establishes the bijection between common neighbors and 3-cliques containing the edge `{u, v}`: ```lean theorem card_commonNeighbors_eq_card_triangles_containing_edge {u v : α} (huv : G.Adj u v) : (G.commonNeighbors u v).toFinset.card = ((G.cliqueFinset 3).filter fun s => {u, v} ⊆ s).card ``` This connects `commonNeighbors` (defined in `Basic.lean`) with `cliqueFinset` — a gap not previously covered in `Clique.lean`. AI disclosure: Claude (Anthropic) was used as an assistant during the development of this proof. It helped with the initial proof structure and tactic suggestions. The proof was reviewed and validated step by step by the author, who can vouch for all the content. The mathematical idea originates from the author's prior Lean 4 work on spectral graph theory (github.com/zeekmartin/topostability-lean4). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics LLM-generated new-contributor	61/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	7	['SnirBroshi', 'github-actions', 'zeekmartin']	nobody	none	13-8950 13 days ago	13-16109 13 days ago	13-16099 13 days
32744	NoneMore author:NoneMore	feat(ModelTheory/Definablity): add `DefinableFun` definition and lemmas	This PR adds two basic shapes of definable sets and `DefinableFun` definition with relevant lemmas. The main result is `Set.Definable.preimage_of_map` asserting that the preimage of a definable set under a definable map is definable. There are also some tool lemmas derived by the preimage lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	147/0	Mathlib/ModelTheory/Definability.lean	1	60	['NoneMore', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	1	12-42320 12 days ago	12-42301 12 days ago	108-525 108 days
36850	whocares-abt author:whocares-abt	feat(Combinatorics/SimpleGraph/Acyclic): add delete leaf from tree gives tree	Added theorem stating Deleting a leaf from a tree produces a tree.	t-combinatorics new-contributor	5/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['github-actions', 'vlad902']	nobody	none	12-22091 12 days ago	16-47079 16 days ago	18-29925 18 days
37026	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Nat/Perm): add two lemmas	If a finite type has at most two elements, then its permutation group is cyclic and commutative. --- - [x] depends on: #36983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	34/1	Mathlib/Data/Finite/Perm.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'tb65536']	nobody	none	12-21373 12 days ago	12-21383 12 days ago	13-83653 13 days
37170	tb65536 author:tb65536	feat(RingTheory/Artinian/Module): add `pow` version of `quotNilradicalEquivPi`	This PR upgrades `IsArtinianRing.quotNilradicalEquivPi` and adds a `pow` version. --- [![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$	33/12	Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Spectrum/Maximal/Basic.lean	2	2	['github-actions', 'tb65536']	nobody	none	12-11373 12 days ago	12-11373 12 days ago	12-11364 12 days
36955	NoneMore author:NoneMore	chore(ModelTheory/Types): expose `T` in `typesWith` and move it to `Theory`	Make the `T : L.Theory` argument explicit in `typesWith` and place the definition in `FirstOrder.Language.Theory` to enable dot notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic new-contributor	24/19	Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean	2	2	['github-actions']	nobody	none	11-25734 11 days ago	16-16099 16 days ago	16-16089 16 days
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	75/7	Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	3	1	['github-actions']	nobody	none	10-80911 10 days ago	10-80989 10 days ago	10-80979 10 days
37131	IvanRenison author:IvanRenison	doc(Combinatorics/SimpleGraph/Partition): improve docstrings in `SimpleGraph.Partition`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	11/16	Mathlib/Combinatorics/SimpleGraph/Partition.lean	1	1	['github-actions']	nobody	none	10-56217 10 days ago	12-75228 12 days ago	12-75218 12 days
37244	tb65536 author:tb65536	chore(Algebra/Algebra/Basic): add `IsLocalHom (algebraMap R R)`	Experimentally, this seems to speed things up. --- [![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/Algebra/Basic.lean	1	4	['github-actions', 'leanprover-radar', 'tb65536']	nobody	none	10-38291 10 days ago	10-80626 10 days ago	10-80618 10 days
33010	xgenereux author:xgenereux	feat: localizations of primes in Dedekind domains are valuation subrings	The goal of this PR is the theorem `valuationSubringAtPrime_eq_valuationSubring` which states that the localization at a nonzero prime in a Dedekind domain is precisely the valuation subring of the valuation associated with that same prime. Given a Dedekind domain `R` in its field of fractions `K`, we define `IsDedekindDomain.valuationSubringAtPrime`, which is the localization of `R` at a nonzero prime, viewed as valuation subring of `K`. We show that `valuationSubringAtPrime K v ≤ (valuation K v).valuationSubring` and use maximality to show that they must be equal. Other small note: - added a variant of `intValuation_exists_uniformizer` in terms of `valuation` (instead of intValuation). Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #33631 - [ ] depends on: #33634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	68/6	Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	1	11	['erdOne', 'github-actions', 'mathlib-dependent-issues', 'xgenereux']	nobody	none	10-3183 10 days ago	10-3153 10 days ago	12-37263 12 days
37291	IvanRenison author:IvanRenison	refactor(Combinatorics/SimpleGraph): move `chromaticNumber_le_two_iff_isBipartite` and `chromaticNumber_eq_two_iff` to `Bipartite` file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	10/12	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	2	1	['github-actions']	nobody	none	9-76671 9 days ago	9-76758 9 days ago	9-76748 9 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	134/114	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	4	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-merge-conflicts']	nobody	none	9-71976 9 days ago	9-71999 9 days ago	10-78793 10 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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions']	nobody	1	9-71887 9 days ago	11-63104 11 days ago	12-36738 12 days
35976	Phelixh author:Phelixh	feat: add add Liu's uncertainty theory foundations (core/distribution/process modules)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	2374/0	Mathlib.lean,Mathlib/Uncertainty/Base.lean,Mathlib/Uncertainty/BaseCore.lean,Mathlib/Uncertainty/BaseDistribution.lean,Mathlib/Uncertainty/BaseProcess.lean,Mathlib/Uncertainty/Uncertainty.lean	6	26	['Phelixh', 'copilot-pull-request-reviewer', 'github-actions']	nobody	none	8-22351 8 days ago	8-22418 8 days ago	8-27705 8 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	221/232	Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean	2	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	8-17248 8 days ago	8-17272 8 days ago	9-49478 9 days
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	57/0	Mathlib.lean,Mathlib/Logic/Small/Basic.lean,Mathlib/SetTheory/Cardinal/EventuallyConst.lean	3	3	['github-actions', 'vihdzp', 'wwylele']	nobody	none	8-1255 8 days ago	8-3800 8 days ago	8-5949 8 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	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	59	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'wwylele']	nobody	none	7-75748 7 days ago	9-78716 9 days ago	14-69931 14 days
37354	SnirBroshi author:SnirBroshi	feat(Order/Defs/PartialOrder): `(a < b ↔ b < a) ↔ (a ≤ b ↔ b ≤ a)` in `Preorder`s	Relate the predicates {`a < b`, `b < a`, `a ≤ b`, `b ≤ a`}. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	12/0	Mathlib/Order/Defs/PartialOrder.lean	1	1	['github-actions']	nobody	none	7-62686 7 days ago	7-62440 7 days ago	7-64113 7 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/)		10/42	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	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	7-43181 7 days ago	7-43206 7 days ago	20-18961 20 days
37373	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Sum): add `LocallyFinite (G ⊕g H)` instance	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	11/0	Mathlib/Combinatorics/SimpleGraph/Sum.lean	1	3	['SnirBroshi', 'github-actions', 'themathqueen']	nobody	none	7-18332 7 days ago	7-21815 7 days ago	7-21805 7 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	1	['github-actions']	nobody	none	6-44731 6 days ago	6-44807 6 days ago	6-44797 6 days
37336	mbkybky author:mbkybky	feat(RingTheory/Polynomial): some lemmas about `Ideal.leadingCoeff`	Add some lemmas about [Ideal.leadingCoeff](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Polynomial/Basic.html#Ideal.leadingCoeff). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	54/1	Mathlib/RingTheory/Polynomial/Basic.lean	1	3	['github-actions', 'wwylele']	nobody	none	6-14797 6 days ago	7-67168 7 days ago	8-18714 8 days
37466	xgenereux author:xgenereux	feat(Torsion/PrimaryComponent): direct sum of primaryComponent on primes is the whole module	Let `M(P)` be the `primaryComponent` for `P : HeightOneSpectrum A`, we have $$M \cong \bigoplus_{P} M(P).$$ This is implemented as `DirectSum.IsInternal`. 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$	68/1	Mathlib/Algebra/Module/Torsion/PrimaryComponent.lean	1	1	['github-actions']	nobody	none	5-73365 5 days ago	5-73442 5 days ago	5-73432 5 days
37222	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/ConjTranspose): `conjTranspose` as an `AlgEquiv`	Wrap `Matrix.conjTranspose` as a `StarAlgEquiv` to the opposite ring. Also upgrade the existing `RingEquiv` to a `StarRingEquiv`. --- This relies on `TrivialStar R` (the matrix has entries in `α` which is an `R`-algebra) because an `AlgEquiv` requires `f (r • M) = r • (f M)` but `conjTranspose` gives `(r • M)ᴴ = (star r) • Mᴴ`. Unlike `LinearEquiv` there doesn't seem to be a ["semilinear" variant of it over `starRingEnd`](https://github.com/leanprover-community/mathlib4/blob/3871d9aa5a510dda9dcf837fbb6ba30d6927d504/Mathlib/Algebra/Module/LinearMap/Star.lean#L25). - [x] depends on: #37178 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/27	Mathlib/LinearAlgebra/Matrix/ConjTranspose.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	5-58916 5 days ago	5-58977 5 days ago	5-59543 5 days
37171	SnirBroshi author:SnirBroshi	chore(Data/Int/Init): generalize `le_induction` from `Prop` to `Sort*` + def lemmas	--- [Zulip 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Add.20note.20to.20help.20search.20similar.20thms/near/535331432) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data large-import	56/48	Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Init.lean,Mathlib/GroupTheory/CoprodI.lean	3	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'plp127']	nobody	none	5-58660 5 days ago	5-58690 5 days ago	6-66382 6 days
36451	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Matching): `edgeSet` is injective and strictly monotonic on matchings, and more API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	41/10	Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	2	3	['github-actions', 'mathlib-merge-conflicts']	nobody	none	5-47539 5 days ago	5-47565 5 days ago	22-43776 22 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/)		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	4	['github-actions', 'grunweg', 'j-loreaux']	nobody	none	5-44228 5 days ago	5-45530 5 days ago	5-51992 5 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/)		6/38	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	1	['FernandoChu', 'github-actions']	nobody	1	5-42553 5 days ago	7-79855 7 days ago	7-79845 7 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/)		10/51	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	1	['artie2000', 'github-actions', 'ooovi']	nobody	2	5-40869 5 days ago	22-17731 22 days ago	22-17721 22 days
37382	tb65536 author:tb65536	feat(RingTheory/TensorProduct/Quotient): add flipped version of `tensorQuotientEquiv`	This PR adds the isomorphism `(A ⧸ I) ⊗[R] T ≃ₐ[S] (A ⊗[R] T) ⧸ I.map (algebraMap A (A ⊗[R] T))` which is just the flipped version of the existing isomorphism `A ⊗[R] (T ⧸ I) ≃ₐ[S] (A ⊗[R] T) ⧸ I.map includeRight`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	19/0	Mathlib/RingTheory/TensorProduct/Quotient.lean	1	2	['WenrongZou', 'github-actions']	nobody	none	5-40713 5 days ago	7-9356 7 days ago	7-9348 7 days
37482	grunweg author:grunweg	chore: test two consecutive simps in the flexible linter	They are not linted, and should not be --- let's add a test to document this. Found when reviewing #36728. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy	9/1	MathlibTest/FlexibleLinter.lean	1	1	['github-actions']	nobody	none	5-39257 5 days ago	5-39322 5 days ago	5-39312 5 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']	nobody	none	5-31890 5 days ago	11-84821 11 days ago	11-84811 11 days
37488	sgouezel author:sgouezel	chore: fix instance diamond for order on `Subtype (IsPartition)`	We introduce a type synonym to avoid the diamond. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	23/8	Mathlib/Data/Setoid/Partition.lean	1	1	['github-actions']	nobody	none	5-30582 5 days ago	5-30650 5 days ago	5-30640 5 days
36886	Deep0Thinking author:Deep0Thinking	feat(Combinatorics/Enumerative/Bonferroni): add Bonferroni inequalities	This PR adds Bonferroni inequalities. Main theorems: - `Finset.indicator_biUnion_le_bonferroniIndicator_of_odd` - `Finset.bonferroniIndicator_le_indicator_biUnion_of_even` - `Finset.card_biUnion_le_bonferroniCard_of_odd` - `Finset.bonferroniCard_le_card_biUnion_of_even` Co-authored-by: Claude (Opus 4.6) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	334/4	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Bonferroni.lean,Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean	3	4	['AlexeyMilovanov', 'Deep0Thinking', 'github-actions']	nobody	none	5-26366 5 days ago	17-19014 17 days ago	17-19833 17 days
37431	YaelDillies author:YaelDillies	chore(Algebra/Pointwise): generalise `closure_pow_le`	Thanks to Andrew for spotting this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/11	Mathlib/Algebra/Group/Submonoid/Pointwise.lean	1	8	['YaelDillies', 'github-actions', 'grunweg', 'j-loreaux', 'vihdzp']	nobody	none	5-19374 5 days ago	5-19432 5 days ago	5-75580 5 days
36552	j-loreaux author:j-loreaux	feat: add instances for `IsMulCommutative s.toWeakerSubobject`	--- - [ ] depends on: #36549 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	60/0	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/RingTheory/NonUnitalSubring/Defs.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Defs.lean	9	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	5-8940 5 days ago	5-8967 5 days ago	5-9262 5 days
36553	j-loreaux author:j-loreaux	feat: add IsMulCommutative instances for directed families of commutative subobjects	--- - [ ] depends on: #36549 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	169/1	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.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/Algebra/Star/Subalgebra.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean	11	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	5-8904 5 days ago	5-8927 5 days ago	5-9121 5 days
37512	xgenereux author:xgenereux	feat(Valuation/IsTrivialOn): transcendental_of_lt_one	For a `K`-algebra `L` and a valuation `v` over `L` which is trivial on `K`, if `y : L` is such that `y ≠ 0` and `v y < 1`, then it is transcendental over `K`. To add this result we need some lemmas from `RatFunc.AsPolynomial` which are not related to `RatFunc` so I have pulled them out of that file. I also didn't want to put this in `Valuation.Basic` so I have made a new file for valuation which are trivial over some base ring. 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	82/25	Mathlib.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/Valuation/IsTrivialOn.lean	3	1	['github-actions']	nobody	none	5-3140 5 days ago	5-3111 5 days ago	5-3183 5 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	2	['github-actions', 'vihdzp']	nobody	none	4-81359 4 days ago	4-85050 4 days ago	4-85040 4 days
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	81/1	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	2	1	['github-actions']	nobody	none	4-80568 4 days ago	4-80643 4 days ago	4-80633 4 days
37443	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walks/Operations): permutations of support	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	4-79648 4 days ago	4-79673 4 days ago	6-3155 6 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/)		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	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	4-79647 4 days ago	4-79670 4 days ago	9-52998 9 days
37406	vihdzp author:vihdzp	feat(SetTheory/Cardinal): `IsStrongPrelimit` predicate	We introduce a predicate for cardinals `c` such that `x < c` implies `x < 2 ^ c`. This is to `IsStrongLimit` as `IsSuccPrelimit` is to `IsSuccLimit`. We then make use of it in a few places where we were writing down `∀ x < c, x < 2 ^ c` explicitly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	56/25	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/Regular.lean	4	1	['github-actions']	nobody	none	4-79583 4 days ago	4-79639 4 days ago	6-46161 6 days
37356	BryceT233 author:BryceT233	feat(RingTheory): uniqueness of the lift of a simple root and the adic completeness of artinian local ring	This PR adds the following three lemmas: * `Polynomial.exists_mul_sq_add_linear_part_eq_eval_add`: this is an alternative version of `Polynomial.eval_add_of_sq_eq_zero` and is used in the lemma `IsLocalRing.eq_of_eval_eq_zero_of_not_isUnit_sub`. * An instance that an artinian local ring is adic complete with respect to its maximal ideal. * `IsLocalRing.eq_of_eval_eq_zero_of_not_isUnit_sub`: this is [stacks [06RR]](https://stacks.math.columbia.edu/tag/06RR) which shows the uniqueness of the lift of a simple root given by the henselian property. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	40/4	Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/Henselian.lean	3	4	['BryceT233', 'artie2000', 'github-actions']	nobody	none	4-76129 4 days ago	7-61044 7 days ago	7-61277 7 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']	nobody	none	4-44318 4 days ago	4-83005 4 days ago	4-82995 4 days
36439	xgenereux author:xgenereux	feat(Algebra/Adjoin): CoeT instances for Algebra.adjoin on singletons	Is it 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$	9/3	Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/RingTheory/Adjoin/Polynomial/Basic.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	none	4-42989 4 days ago	9-82070 9 days ago	27-23163 27 days
34854	GrigorenkoPV author:GrigorenkoPV	chore(Combinatorics/Enumerative/Catalan): split into `Basic` & `Tree`	--- Split off from #34853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	227/194	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Enumerative/Catalan/Basic.lean,Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	6	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	none	4-42236 4 days ago	20-16627 20 days ago	40-6516 40 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	84/84	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean	4	20	['MJ141592', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	none	4-41058 4 days ago	4-41094 4 days ago	4-69605 4 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	2	['YaelDillies', 'github-actions', 'ooovi', 'vihdzp']	nobody	3	4-40993 4 days ago	6-40612 6 days ago	6-40739 6 days
37532	justus-springer author:justus-springer	feat(Algebra/Category/ModuleCat/Sheaf): `isQuasicoherent` and `isFinitePresentation` are closed under isomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	38/2	Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean	2	1	['github-actions']	nobody	none	4-38780 4 days ago	4-38856 4 days ago	4-38846 4 days
37503	Vierkantor author:Vierkantor	chore(*): remove comments mentioning obsolete note `[nolint_ge]`	In Lean 3 times we used to have a `ge_or_gt` linter which complained if theorem statements contained `≥` or `>`, and it would be silenced with a reference to the library note `[nolint_ge]`. But the linter and its note never got ported, so the references are irrelevant and we should drop them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter tech debt	1/6	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Cauchy.lean	5	4	['Vierkantor', 'github-actions', 'grunweg']	nobody	none	4-37538 4 days ago	5-18450 5 days ago	5-18440 5 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	18/0	Mathlib/Data/Set/Card.lean	1	1	['github-actions']	nobody	none	4-36654 4 days ago	4-36724 4 days ago	4-36714 4 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/)		7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	3	['artie2000', 'github-actions', 'mathlib-merge-conflicts']	nobody	1	4-29193 4 days ago	4-29217 4 days ago	20-1026 20 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	none	4-25215 4 days ago	4-25286 4 days ago	4-25276 4 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` * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` * `PointedCone.neg_ofSubmodule` proving `-(ofSubmodule S) = S` In preparation for #36605. Co-authored by: Artie Khovanov --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	28/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	10	['artie2000', 'github-actions', 'martinwintermath', 'ooovi']	nobody	1	4-24788 4 days ago	4-24826 4 days ago	4-63303 4 days
37484	martinwintermath author:martinwintermath	feat(RingTheory/Finiteness): Improve `fg_induction`	- rename `fg_induction` to `fg_induction'` - include the FG-hypothesis into motive for `fg_induction'`. This is necessary, since it might be that `P (M₁ ⊔ M₂)` is only provable from `P M₁`and `P M₂` if we can use that `M₁` and `M₂` are FG. Also, `M₁.FG` and `M₂.FG` are not provable from `(M₁ ⊔ M₂).FG` in general. - add new `fg_induction` variant that adds one 1-dimensional submodule at a time. - give expressive names to the induction start and induction step hypotheses. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	46/34	Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean	4	2	['github-actions', 'vihdzp']	nobody	none	4-24571 4 days ago	5-33896 5 days ago	5-33886 5 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. --- - [ ] 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	161/0	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	none	4-23534 4 days ago	4-26196 4 days ago	4-26518 4 days
36723	oliver-butterley author:oliver-butterley	fix(`ClearExcept`): modify so that each `isAuxDecl` is retained	This PR updates the defintion of `ClearExcept` to skip any `isAuxDecl` and adds a test to confirm this behaviour. The intent is that clear * - only clears user-visible local declarations; hidden auxiliary declarations should be handled by more specific mechanisms when needed. Motivation When writing a recursive proof in tactic mode, Lean places the recursive hypothesis in the local context as an auxiliary declaration (`LocalDecl.isAuxDecl`). This declaration is: - Completely invisible in the Infoview (even with all display options enabled) - Required for the recursive call to elaborate Previously the `clear * -` tactic (`Mathlib.Tactic.ClearExcept`) iterates over all declarations in the local context and clears everything not in the explicit keep set or a type-class instance. As such it silently clears the recursive hypothesis. While the hypothesis can technically be added to the keep set by name, it is not shown in the Infoview, making it easy to overlook. In simple examples this is never an issue, the inconvenience was found when working with software verification where the context gets huge and needs clearing for performance and where the recursive goals are closed by automation and so it is easy to overlook the need to explicitly add the name of the theorem to the exclude list. Zulip discussion: ([#general > ClearExcept clears even if isAuxDecl, is this intended?](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/ClearExcept.20clears.20even.20if.20isAuxDecl.2C.20is.20this.20intended.3F/with/578745941)). --- - [ ] depends on: #36961 (refactor proof which uses clear*- to clear auxDecl created by wlog) - [ ] depends on: #36966 (warning that clearExcept does nothing in this use) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	22/8	Mathlib/Data/Vector/Basic.lean,Mathlib/Tactic/ClearExcept.lean,MathlibTest/ClearExcept.lean	3	9	['adam84-hub', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'oliver-butterley']	nobody	none	4-9708 4 days ago	6-19800 6 days ago	6-19790 6 days
37573	vihdzp author:vihdzp	feat: supremum of `≤ c` ordinals of cardinal `≤ c` has cardinal `≤ c`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	47/14	Mathlib/SetTheory/Cardinal/Ordinal.lean	1	1	['github-actions']	nobody	none	3-82498 3 days ago	3-83195 3 days ago	3-83185 3 days
37574	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): Add lemma `Walk.IsCircuit.isCycle_cycleBypass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	8/3	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	none	3-81111 3 days ago	3-81180 3 days ago	3-81170 3 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. --- 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	77/37	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	4	1	['github-actions']	nobody	none	3-79750 3 days ago	3-79826 3 days ago	3-79816 3 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	41/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Pigeonhole.lean	2	12	['IvanRenison', 'cjrl', 'ghseeli', 'github-actions', 'j-loreaux']	nobody	none	3-68903 3 days ago	3-68903 3 days ago	9-71315 9 days
37576	WenrongZou author:WenrongZou	feat(MvPowerSeries): connection between rename and subst	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	33/6	Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Rename.lean	2	3	['BryceT233', 'WenrongZou', 'github-actions']	nobody	none	3-66224 3 days ago	3-80045 3 days ago	3-80035 3 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	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	5	['KryptosAI', 'Multramate', 'github-actions', 'ooovi']	nobody	1	3-66051 3 days ago	3-66109 3 days ago	17-76427 17 days
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	none	3-39309 3 days ago	3-39332 3 days ago	17-23150 17 days
37505	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `SimpleGraph.length_cycleBypass_le`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	3/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	1	3-33238 3 days ago	5-17043 5 days ago	5-17033 5 days
37566	harahu author:harahu	doc(Order): 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/)	t-order	15/7	Mathlib/Order/Circular.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean	7	1	['Multramate', 'github-actions']	nobody	1	3-24528 3 days ago	4-5266 4 days ago	4-5256 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	131/116	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/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean	17	1	['Multramate', 'github-actions']	nobody	1	3-24255 3 days ago	10-74188 10 days ago	10-79875 10 days
36220	harahu author:harahu	doc(misc): update two theorem names	- https://www.wikidata.org/wiki/Q1543149 carries the name "Sokhotski–Plemelj theorem" - While https://www.wikidata.org/wiki/Q2226807 does carry the name "Vantieghems theorem", I assume the s is intended to be possessive, since the mathematician credited with the result is called Emmanuel Vantieghem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	2/2	docs/1000.yaml	1	7	['dwrensha', 'github-actions', 'harahu']	nobody	none	3-24146 3 days ago	31-85705 31 days ago	31-85695 31 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	15	['IvanRenison', 'YaelDillies', 'github-actions', 'mkaratarakis']	nobody	none	3-23105 3 days ago	3-24256 3 days ago	4-56259 4 days
37400	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): endpoints of a path have at most one neighbor in the path	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	1	3-18072 3 days ago	6-63753 6 days ago	6-63743 6 days
37542	martinwintermath author:martinwintermath	chore(LinearAlgebra/Dual): deprecate `Module.dualPairing`	- deprecate `Module.dualPairing` (and associated lemmas) since merely synonym for identity (essentially always easier to just use `.id`, see next bullet point) - remove use of deprecated lemmas - remove from file doc-string - generalize `dualPairing_nondegenerate` + rename to `id_nondegenerate` - add accompanying `id_separatingLeft`, `id_separatingRight` and versions for `Dual.eval` (similar lemmas have also been proposed in #34487) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	46/24	Mathlib/Analysis/Convex/Cone/TensorProduct.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean	4	3	['artie2000', 'github-actions']	nobody	none	3-12890 3 days ago	4-19390 4 days ago	4-19380 4 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`](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 https://github.com/WuProver/groebner_proj. --- It's upstream 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	245/2	Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	2	5	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	3-11509 3 days ago	3-12947 3 days ago	3-15034 3 days
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		189/0	Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/MeasureTheory/Measure/ResolventTransform.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	none	3-9324 3 days ago	3-9368 3 days ago	3-77283 3 days
37592	erdOne author:erdOne	feat: set up API for `ConvexSpace`	We introduce `sConvexCombo` and the indexed version `iConvexCombo` as the main API for `ConvexSpace` and prove lemmas around the new definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import maintainer-merge label:t-algebra$	452/133	Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/LinearAlgebra/ConvexSpace.lean,Mathlib/LinearAlgebra/ConvexSpace/AffineSpace.lean	3	15	['YaelDillies', 'erdOne', 'github-actions']	nobody	1	3-7974 3 days ago	3-23902 3 days ago	3-25159 3 days
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	4	['Rida-Hamadani', 'SnirBroshi', 'github-actions']	nobody	none	3-4682 3 days ago	6-62193 6 days ago	6-62327 6 days
37617	harahu author:harahu	doc(FieldTheory): 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/)	t-algebra label:t-algebra$	33/31	Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/FieldTheory/RatFunc/Basic.lean	7	1	['github-actions']	nobody	none	3-1310 3 days ago	3-1381 3 days ago	3-1371 3 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
36314	JovanGerb author:JovanGerb	feat(gcongr): support `rintro` patterns	This PR adds support for `rintro` patterns in the `with` clause of `gcongr`. This makes it consistent with `congr!`. I've only found one case in mathlib where this could actually be used to shorten a proof. I split the gcongr `elab` into a separate `syntax` and `elab_rules`, which makes it easier to deal with the syntax. I noticed that the implementation of `congr!` was unnecessarily converting back and forth between `rintroPat` and `rcasesPat`, so I changed it to simply only use `rintroPat`, and then did the same in `gcongr`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	41/28	Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Tactic/CongrExclamation.lean,Mathlib/Tactic/Convert.lean,Mathlib/Tactic/Core.lean,Mathlib/Tactic/GCongr/Core.lean	5	2	['dupuisf', 'github-actions']	dwrensha assignee:dwrensha	none	20-69882 20 days ago	30-32929 30 days ago	30-33047 30 days
36545	yuanyi-350 author:yuanyi-350	feat(ProbabilityTheory): Add Kolmogorov's inequality	ref: https://en.wikipedia.org/wiki/Kolmogorov%27s_inequality --- - [x] depends on: #36542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability large-import	147/0	Mathlib.lean,Mathlib/Probability/CondVar.lean,Mathlib/Probability/Martingale/Kolmogorov.lean,Mathlib/Probability/Martingale/OptionalStopping.lean	4	3	['CoolRmal', 'github-actions', 'mathlib-dependent-issues']	RemyDegenne assignee:RemyDegenne	none	19-69892 19 days ago	24-34864 24 days ago	24-36643 24 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	323/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	none	18-69910 18 days ago	35-49403 35 days ago	35-49439 35 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	2	['github-actions', 'mathlib-dependent-issues']	kex-y assignee:kex-y	none	18-46139 18 days ago	21-34322 21 days ago	21-34313 21 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	151/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Contraction.lean,Mathlib/Combinatorics/SimpleGraph/Minor.lean	3	7	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vbeffara']	YaelDillies assignee:YaelDillies	none	17-15127 17 days ago	18-23054 18 days ago	31-49634 31 days
35622	SnirBroshi author:SnirBroshi	feat(Logic/Function/Basic): `onFun` and `swap` preserve relation properties	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	141/19	Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WellFounded.lean,Mathlib/Order/WithBot.lean	8	7	['SnirBroshi', 'github-actions', 'leanprover-radar', 'vihdzp']	awainverse assignee:awainverse	1	16-69935 16 days ago	31-60352 31 days ago	43-44193 43 days
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	41/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	3	11	['CBirkbeck', 'Multramate', 'erdOne', 'github-actions', 'riccardobrasca']	kim-em assignee:kim-em	none	16-69930 16 days ago	30-80 30 days ago	30-70 30 days
34805	DavidLedvinka author:DavidLedvinka	feat(Tactic): generalize ofScientific NormNum extension to `DivisionSemiring`	Co-authored-by: @hrmacbeth	t-meta	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']	JovanGerb assignee:JovanGerb	1	16-474 16 days ago	16-475 16 days ago	36-41877 36 days
34315	LessnessRandomness author:LessnessRandomness	feat(Combinatorics/SimpleGraph/Bipartite): Prove upper bound of edge set cardinality of bipartite graph	Two ways to express upper bound of the edge set of bipartite graph: 1) If the cardinalities of both parts/sets, that make bipartite graph, are known, then the upper bound is equal to product of the cardinalities of both parts; 2) Four times of the cardinality of the edge set is less or equal to squared cardinality of vertex set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	54/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	56	['LessnessRandomness', 'SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	awainverse assignee:awainverse	1	15-85911 15 days ago	15-85981 15 days ago	67-77921 67 days
35413	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	This PR continues the work from #21182. Original PR: https://github.com/leanprover-community/mathlib4/pull/21182	t-meta	73/6	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	3	['github-actions', 'joneugster', 'mathlib-bors']	alexjbest and dwrensha assignee:dwrensha assignee:alexjbest	none	15-69926 15 days ago	49-13161 49 days ago	49-13151 49 days
36783	wwylele author:wwylele	feat(RingTheory/Localization): R ⧸ pⁿ ≃+* Rₚ ⧸ (maximalIdeal Rₚ)ⁿ	This extends the existing `def equivQuotMaximalIdeal : R ⧸ p ≃+* Rₚ ⧸ maximalIdeal Rₚ` to powers of maximal ideals. --- Disclosure of AI usage: I chat with AI for a sketch of the proof. The code is entirely written by me. I didn't state the simp lemma for the symm direction because I am not sure how to state it. Following the analog of equivQuotMaximalIdeal_symm_apply_mk, this should be ``` theorem equivQuotMaximalIdealPow_symm_apply_mk (x : R) (s : p.primeCompl) : (equivQuotMaximalIdealPow p Rₚ n).symm (Ideal.Quotient.mk _ (IsLocalization.mk' Rₚ x s)) = (Ideal.Quotient.mk (p ^ n) x) * (Ideal.Quotient.mk (p ^ n) s)⁻¹ := by ``` But `(Ideal.Quotient.mk (p ^ n) s)⁻¹` is taking inverse in a non-field ring. Here the inverse always exists because s is not in p. What is the mathlib way to say this? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	53/0	Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Nilpotent.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean	3	1	['github-actions']	chrisflav assignee:chrisflav	none	15-69904 15 days ago	19-69869 19 days ago	19-69859 19 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	30/0	Mathlib/Order/UpperLower/Basic.lean	1	6	['SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	none	15-42901 15 days ago	23-69898 23 days ago	23-69888 23 days
36785	hommmmm author:hommmmm	feat(RingTheory/Localization): Nagata's criterion for primality in localization away	## Summary - Add `dvd_of_mem_span_singleton_localization`: if `p` is prime and `p ∤ x`, then membership in the span of the image of `x` in `R[1/p]` implies divisibility by `x`. - Add `prime_of_prime_in_localization` (Nagata's criterion): if `p` is prime, `x` is irreducible, and the image of `x` in `R[1/p]` is prime, then `x` is prime. ## References - [Stacks Project, Tag 0AFU](https://stacks.math.columbia.edu/tag/0afu) ## AI Disclosure This code is written without AI, then uses Claude Code with cameronfreer's [Lean4-skills](https://github.com/cameronfreer/lean4-skills) (specifically, the `review`, `refactor`, and `golf` workflow) for style changes, refactoring and golfing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	72/0	Mathlib.lean,Mathlib/RingTheory/Localization/Away/Prime.lean	2	4	['chrisflav', 'github-actions', 'hommmmm']	chrisflav assignee:chrisflav	none	15-1294 15 days ago	15-1294 15 days ago	19-27905 19 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. --- - [ ] depends on: #30436 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	427/1	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Pentagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Pentagonal.lean,docs/1000.yaml	4	43	['copilot-pull-request-reviewer', 'github-actions', 'jcommelin', 'mathlib4-dependent-issues-bot', 'tb65536', 'urkud', 'vihdzp', 'wwylele']	eric-wieser assignee:eric-wieser	none	14-69876 14 days ago	54-21484 54 days ago	100-47494 100 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	77/10	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	25	['Komyyy', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	1	14-69870 14 days ago	67-5437 67 days ago	78-50842 78 days
34809	YaelDillies author:YaelDillies	feat: induced subgraphs of complete multipartite graphs are complete multipartite	From ProofBench --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	4/2	Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean	1	1	['github-actions']	kmill assignee:kmill	none	14-69862 14 days ago	61-84545 61 days ago	61-84535 61 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	t-algebra new-contributor label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	11	['Xxxjdjdid', 'banrovegrie', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	1	14-69859 14 days ago	60-18226 60 days ago	60-18216 60 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 label:t-algebra$	610/0	Archive.lean,Archive/Robbins.lean	2	1	['github-actions']	kim-em assignee:kim-em	none	14-69858 14 days ago	57-62484 57 days ago	57-64126 57 days
34994	bwangpj author:bwangpj	feat: Countable.of_module_finite	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import FLT label:t-algebra$	7/0	Mathlib/LinearAlgebra/Countable.lean	1	3	['bwangpj', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	none	14-69857 14 days ago	57-1598 57 days ago	57-1588 57 days
35365	wwylele author:wwylele	feat(LinearAlgebra/Simplex): closedInterior = interior + face.closedInterior	Intermediate lemma towards #34826. This will be used to show the measure on `interior` and `closedInterior` are equal, as the difference is a zero-measure set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	53/0	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	4	['copilot-pull-request-reviewer', 'github-actions']	eric-wieser assignee:eric-wieser	none	14-69855 14 days ago	39-19484 39 days ago	50-14619 50 days
36308	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Subgraph): a couple of `subgraphOfAdj` lemmas	--- Also golfed a lemma (it's one line longer but it looks simpler to me). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/5	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	1	['github-actions']	kmill assignee:kmill	none	14-69849 14 days ago	30-49126 30 days ago	30-49116 30 days
36787	hommmmm author:hommmmm	feat(RingTheory/LocalRing): Krull dimension results for maximal ideal of local ring	## Summary This PR adds two results connecting the Krull dimension of a local ring to its maximal ideal: * `IsLocalRing.ringKrullDim_eq_zero_of_maximalIdeal_eq_bot`: A local ring whose maximal ideal is `⊥` has Krull dimension zero. * `IsLocalRing.exists_mem_maximalIdeal_not_mem_sq`: In a Noetherian local ring of positive Krull dimension, there exists an element in the maximal ideal that is not in its square. The second result follows from Nakayama's lemma: if every element of the maximal ideal `𝔪` were in `𝔪²`, then `𝔪 = 𝔪²`, and Nakayama gives `𝔪 = ⊥`, contradicting positive dimension. ## New file * `Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean` ## Acknowledgements Thanks to Dora Kassabova and Leopold Mayer for edit suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory	57/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean	2	10	['NoahW314', 'github-actions', 'hommmmm', 'tb65536', 'wwylele']	chrisflav assignee:chrisflav	none	14-69843 14 days ago	19-767 19 days ago	19-62932 19 days
36789	hommmmm author:hommmmm	feat(RingTheory/Ideal/Height): prime ideal determined by height among overideals	## Summary - Add `Ideal.eq_of_le_of_height_eq`: a prime ideal of finite height is equal to any ideal of the same height that contains it. ## Notes This is a direct consequence of `Ideal.height_strict_mono_of_is_prime`: if `I` were strictly contained in `J`, their heights would differ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	10/0	Mathlib/RingTheory/Ideal/Height.lean	1	7	['github-actions', 'hommmmm', 'tb65536']	erdOne assignee:erdOne	none	14-69842 14 days ago	19-61879 19 days ago	19-61869 19 days
36970	astrainfinita author:astrainfinita	chore: redefine `Nat.div2` `Nat.bodd`	--- This PR continues the work from #13649. Original PR: https://github.com/leanprover-community/mathlib4/pull/13649	t-data	54/72	Mathlib/Computability/Primrec/Basic.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	7	2	['astrainfinita', 'github-actions']	TwoFX assignee:TwoFX	none	14-69835 14 days ago	15-58969 15 days ago	15-64348 15 days
35627	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Finite): min/max degrees of top/bot	And a couple of lemmas about `IsRegularOfDegree`, e.g. the empty graph is regular of any degree. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	30/1	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	2	15	['SnirBroshi', 'YaelDillies', 'github-actions', 'vlad902']	kmill assignee:kmill	2	14-45679 14 days ago	15-66101 15 days ago	41-14394 41 days
35880	astrainfinita author:astrainfinita	feat(Order/Defs/LinearOrder): `min_ind`	It will be used to simplify the proofs of other lemmas in a subsequent PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/0	Mathlib/Order/Defs/LinearOrder.lean	1	3	['astrainfinita', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	none	14-29228 14 days ago	14-29228 14 days ago	37-14582 37 days
36642	tb65536 author:tb65536	feat(NumberTheory/ArithmeticFunction/LFunction): arithmetic functions from power series	This PR constructs arithmetic functions from power series. See #36189 for how this will ultimately be used to construct L-functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra label:t-algebra$	139/0	Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction/LFunction.lean,Mathlib/NumberTheory/Divisors.lean	3	8	['github-actions', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	none	14-14510 14 days ago	14-14510 14 days ago	23-22188 23 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	215-73820 7 months ago	224-24974 224 days ago	0-19882 5 hours
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	181/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	35-14838 1 month ago	168-14565 168 days ago	0-22513 6 hours
35576	Tehlikeli107 author:Tehlikeli107	⚡ [performance] Pre-compile regexes in lake-build-wrapper.py	- Pre-compile `file_info_re` and `progress_re` in `BuildOutputProcessor.__init__` to avoid repeated compilation overhead. - Replace `re.sub(r'\.', '/', target)` with `target.replace('.', '/')` for better performance when converting module names to file paths. These changes result in a measured ~40% performance improvement in the core processing logic of the wrapper script. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-author CI new-contributor merge-conflict	8/707	scripts/bench/README.md,scripts/bench/build/README.md,scripts/bench/build/fake-root/bin/lean,scripts/bench/build/fake-root/bin/lean.py,scripts/bench/build/lakeprof_report_template.html,scripts/bench/build/lakeprof_report_upload.py,scripts/bench/build/run,scripts/bench/combine.py,scripts/bench/lint/README.md,scripts/bench/lint/run,scripts/bench/measure.py,scripts/bench/open-mathlib/README.md,scripts/bench/open-mathlib/run,scripts/bench/repeatedly.py,scripts/bench/run,scripts/bench/size/README.md,scripts/bench/size/run,scripts/bench/size/run.py,scripts/lake-build-wrapper.py	19	7	['bryangingechen', 'felixpernegger', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	34-39540 1 month ago	45-5813 45 days ago	0-8924 2 hours
34245	staroperator author:staroperator	feat(Data/Set): add `Set.Uncountable`	There are `Set` specialized shortcuts `Set.Finite`, `Set.Infinite` and `Set.Countable`, but lacking `Set.Uncountable`. I find this useful in #34246. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	82/4	Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Data/Set/Countable.lean,Mathlib/SetTheory/Cardinal/Basic.lean	3	17	['github-actions', 'joneugster', 'staroperator', 'vihdzp']	joneugster assignee:joneugster	31-37506 1 month ago	62-10753 62 days ago	12-21154 12 days
35436	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Monoidal/Closed): Prove the isomorphism of internal hom objects C(x \otimes y, z) and C(y, C(x, z))	Prove the currying-uncurrying isomorphism `C(x \otimes y, z) \iso C(y, C(x, z))` between internal hom objects of a closed monoidal category `C`. --- This result is connected to the infinity-cosmos project, and is used to prove that a closed monoidal category enriched in itself admits all cotensors. ~Line 81 currently contains a one-line proof in tactics mode `exact rfl`. When trying to use `rfl` outside of tactics mode, an error is thrown~ (Fixed, thank you @robin-carlier!). Any help with this (or any other aspect of the formalization) is greatly appreciated! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos delegated	89/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Closed/InternalCurrying.lean	2	15	['dagurtomas', 'daniel-carranza', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	adamtopaz assignee:adamtopaz	31-5394 1 month ago	38-79933 38 days ago	7-67484 7 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	22-27526 22 days ago	24-51637 24 days ago	27-58977 27 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	t-algebra new-contributor label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	11	['Xxxjdjdid', 'banrovegrie', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	14-69859 14 days ago	60-18226 60 days ago	60-18216 60 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	12-44369 12 days ago	26-19928 26 days ago	22-62559 22 days
37515	chrisflav author:chrisflav	feat(Topology): a coinducing map with connected fibers induces a homeomorphism on connected components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	53/0	Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	3	11	['chrisflav', 'github-actions', 'grunweg', 'scholzhannah']	j-loreaux assignee:j-loreaux	4-40643 4 days ago	4-40805 4 days ago	5-1249 5 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	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-dependent-issues']	nobody	4-13124 4 days ago	4-13125 4 days ago	0-1300 21 minutes
37553	grunweg author:grunweg	Golf misc	--- - [ ] depends on: #37462 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR merge-conflict	280/292	Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1988Q6.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.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/Archimedean/Basic.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/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.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/PhragmenLindelof.lean,Mathlib/Analysis/Complex/Trigonometric.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/MellinInversion.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Field/Approximation.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.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/Combinatorics/SimpleGraph/Regularity/Uniform.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,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Integral/Gamma.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/MeasureTheory/OuterMeasure/Caratheodory.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/PythagoreanTriples.lean	100	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-2092 3 days ago	4-16788 4 days ago	0-1 1 second
37658	joelriou author:joelriou	chore(AlgebraicTopology): rename `SingularHomology.HomotopyInvarianceTopCat`	Following #37656, it is possible to rename `SingularHomology.HomotopyInvarianceTopCat` as `SingularHomology.HomotopyInvariance`. --- - [ ] depends on: #37656 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP file-removed blocked-by-other-PR	321/181	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/HomotopyInvariance.lean,Mathlib/AlgebraicTopology/SingularHomology/Basic.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvariance.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvarianceTopCat.lean	6	3	['github-actions', 'mathlib-dependent-issues']	nobody	1-38150 1 day ago	1-39349 1 day ago	0-1 1 second

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	596-278 1 year ago	659-76264 659 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	595-10243 1 year ago	604-56405 604 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	101-80916 3 months ago	101-80916 101 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', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	69-84851 2 months ago	690-85845 690 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	64-80916 2 months ago	355-72148 355 days ago	0-1017 16 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	253/260	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	139	10	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	12-40787 12 days ago	13-24857 13 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	10-59906 10 days ago	17-5373 17 days ago	0-60 1 minute
37358	grunweg author:grunweg	chore(Geometry/Manifold): don't expose definitions depending on choice	Some definitions in `Immersion.lean` still depend on choice, but need to be exposed for subsequent instances using their definition. We leave them alone for now. Also make not exposing definition the default in LocalDiffeomorph; two definitions have useful defeq, the others do not. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry tech debt	12/12	Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean	4	1	['github-actions']	nobody	5-83857 5 days ago	5-83799 5 days ago	0-373 6 minutes
37503	Vierkantor author:Vierkantor	chore(*): remove comments mentioning obsolete note `[nolint_ge]`	In Lean 3 times we used to have a `ge_or_gt` linter which complained if theorem statements contained `≥` or `>`, and it would be silenced with a reference to the library note `[nolint_ge]`. But the linter and its note never got ported, so the references are irrelevant and we should drop them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter tech debt	1/6	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Cauchy.lean	5	4	['Vierkantor', 'github-actions', 'grunweg']	nobody	4-37538 4 days ago	5-18450 5 days ago	5-18440 5 days
37678	vihdzp author:vihdzp	chore(Dynamics/FixedPoints/Defs): create `Defs` file	--- I got a large import warning on another PR for simply importing the definition `Function.fixedPoints`, which I found rather silly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics tech debt	67/44	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Defs.lean,Mathlib/Logic/Function/Defs.lean	4	1	['github-actions']	nobody	0-78223 21 hours ago	0-78099 21 hours ago	0-78667 21 hours
37681	vihdzp author:vihdzp	chore: move `Ordinal.univ` and `Cardinal.univ` to their own file	This ensures `SetTheory/Ordinal/Basic` stays under the 1500 line limit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory tech debt	186/147	Mathlib.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/UnivLE.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Univ.lean	5	1	['github-actions']	nobody	0-72298 20 hours ago	0-72352 20 hours ago	0-73752 20 hours
37391	grunweg author:grunweg	fix(create_deprecated_modules): fix the build again	The code needed updating to the new String API; it failed to build before this PR. This also removes uses of deprecated String API. A future PR will add CI to ensure this script builds fine. (Future future: can we test that we tested all .lean scripts? Or have a test which builds all .lean files in scripts?) --- We need to annotate a type as `Char` now, perhaps because the default instances (from a `Char` to a `Slice.Pattern`) don't work out as well any more. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI maintainer-merge	22/20	scripts/create_deprecated_modules.lean	1	24	['adomani', 'github-actions', 'grunweg']	adomani assignee:adomani	0-52392 14 hours ago	2-16849 2 days ago	4-61193 4 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	astrainfinita author:astrainfinita	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	502-29311 1 year ago	509-21870 509 days ago	33-53295 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	335-78988 11 months ago	605-15773 605 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	275-59337 9 months ago	547-6980 547 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	275-58175 9 months ago	308-33292 308 days ago	6-44784 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	215-73820 7 months ago	224-24974 224 days ago	0-19882 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	172-51030 5 months ago	223-82827 223 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	144-61904 4 months ago	184-40570 184 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	139-79036 4 months ago	559-20024 559 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	139-8877 4 months ago	484-58807 484 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	138-46045 4 months ago	335-78974 335 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	138-17911 4 months ago	613-38193 613 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	629/0	Mathlib.lean,Mathlib/Data/QuotType.lean,MathlibTest/QuotType.lean	3	20	['YaelDillies', 'astrainfinita', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	116-86157 3 months ago	169-55010 169 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	89-54470 2 months ago	90-14803 90 days ago	7-33574 7 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 label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	8	['Garmelon', 'Vierkantor', 'artie2000', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	74-16905 2 months ago	74-16905 74 days ago	40-42357 40 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	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	5	['chiyunhsu', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	67-21723 2 months ago	67-21723 67 days ago	42-22427 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	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	9	['ADedecker', 'LTolDe', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	64-34133 2 months ago	90-18265 90 days ago	11-7507 11 days
34720	Paul-Lez author:Paul-Lez	feat(RingTheory/PowerSeries/Composition): define composition of power series	This PR defines the composition of two power series, and adds various pieces of API lemmas (this is mostly fixing up and upstreaming code from [this repo](https://github.com/rmhi/formal_deriv)). This is the first of a series of PRs upstreaming work that was done at the CFT workshop in Oxford last summer, working towards proving some results about the `exp` and `log` power series (and their composition!), and constructing the isomorphism $(\mathfrak{m}_K ^ n, +) \cong (1 + \mathfrak{m}_K ^ n, \times)$ for sufficiently large $n$, where $K$ is a characteristic zero local field. Co-authored-by: Richard Hill Co-authored-by: Calle Sönne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-zulip	844/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Composition.lean	2	3	['Paul-Lez', 'github-actions', 'vihdzp']	nobody	55-80142 1 month ago	63-32062 63 days ago	0-10 10 seconds
33441	dupuisf author:dupuisf	feat: add `LawfulInv` class for types with an inverse that behaves like `Ring.inverse`	This PR introduces a new typeclass `LawfulInv` for types which have an `Inv` instance that is equal to zero on non-invertible elements. This is meant to replace `Ring.inverse`. The current plan is to do this refactor in several steps: 1. This PR, which only introduces the class and adds instances for matrices and continuous linear maps. 2. Add instances for all C*-algebras, and make `CStarAlgebra` extend this. 3. Deprecate `Ring.inverse`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra merge-conflict label:t-algebra$	185/27	Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/Topology/Algebra/Module/Equiv.lean	7	35	['dupuisf', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	47-52481 1 month ago	75-85616 75 days ago	7-54141 7 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	19	['adomani', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-bot', 'leanprover-radar', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	47-44907 1 month ago	220-41225 220 days ago	66-73556 66 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	39-39279 1 month ago	385-17218 385 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	39-39263 1 month ago	336-21157 336 days ago	39-61332 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	38-59292 1 month ago	303-2191 303 days ago	34-10092 34 days
34649	peabrainiac author:peabrainiac	feat(Analysis/Calculus/ContDiff): add notation `ℕ∞ω` for `WithTop ℕ∞`	Add a `ContDiff`-scoped notation `ℕ∞ω` for `WithTop ℕ∞`, accompanying the existing notations `∞` and `ω` for `(⊤ : ℕ∞) : ℕ∞ω` and `⊤ : ℕ∞ω`. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/RFC.3A.20notation.20for.20.60WithTop.20.E2.84.95.E2.88.9E.60/near/573917824) I've also replaced `WithTop ℕ∞` with this new notation already in the files that mention it the most, but not in all files yet; many mention `WithTop ℕ∞` just a couple of times but don't open the `ContDiff` namespace. I'm not sure whether that should be taken as a sign to not make the notation scoped, or whether the solution is just to `open scoped ContDiff` in these files or not use the notation there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-analysis awaiting-author awaiting-zulip merge-conflict	221/218	Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.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/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/Deriv.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/ImplicitContDiff.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Algebra/LieGroup.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/Geometry/Manifold/Algebra/Structures.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/FiberwiseLinear.lean	28	5	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'peabrainiac']	sgouezel assignee:sgouezel	36-4831 1 month ago	54-79472 54 days ago	8-6287 8 days
34245	staroperator author:staroperator	feat(Data/Set): add `Set.Uncountable`	There are `Set` specialized shortcuts `Set.Finite`, `Set.Infinite` and `Set.Countable`, but lacking `Set.Uncountable`. I find this useful in #34246. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	82/4	Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Data/Set/Countable.lean,Mathlib/SetTheory/Cardinal/Basic.lean	3	17	['github-actions', 'joneugster', 'staroperator', 'vihdzp']	joneugster assignee:joneugster	31-37506 1 month ago	62-10753 62 days ago	12-21154 12 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	19-77044 19 days ago	46-38206 46 days ago	0-187 3 minutes
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 label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	28	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-12039 19 days ago	105-11230 105 days ago	10-66980 10 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	14-49448 14 days ago	17-36188 17 days ago	0-10825 3 hours
34077	kbuzzard author:kbuzzard	perf: increase priority of instSMulOfMul	#31040 deprecated `Mul.toSMul` in place of the core instance `instSMulOfMul`, which is at a lowered priority of 910. This PR undeprecates it and makes it a higher priority instance (1100) which seems better for mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR follows the philosophy seen in Mathlib's `Algebra.id : Algebra R R`, which also has raised priority. The idea is the same as `Algebra.id`: if you're looking for an instance of `Algebra R S` with R not equal to S then `Algebra.id` is extremely likely to fail quickly in practice, and if you're looking for an instance of `Algebra R R` then `Algebra.id` is unambiguously the right answer so should be tried ASAP. However the instance is defined so early in mathlib that in in practice it is tried last unless the priority is raised. The same philosophy holds here; if you're looking for an instance of `SMul X X` then you absolutely want to try `Mul.toSMul` first and if you're looking for an instance of `SMul X Y` with Y not X then `Mul.toSMul` will in practice be quick to fail. This PR was inspired by #33908 (another "this should be quick to fail and if it fits then it's almost certainly what we want" prio change) which made an instance of `IsScalarTower R A A` high priority and gave a performance boost. This PR also gives a performance boost. Note that the performance in #31040 looks very bad but the radar output is incorrect; there was a hardware change between the two runs. In fact #31040 produced no changes in profiling, as one might expect. I don't know the correct way to change the priority of a core instance in mathlib, and I didn't know if just changing the priority naively would work repo-wide rather than just file-wide, which was why this PR introduces a second instance. Zulip discussion at [#mathlib4 > priority hacks](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/priority.20hacks/with/574353616)	t-algebra awaiting-zulip label:t-algebra$	3/9	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Units.lean	2	26	['alreadydone', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts']	jcommelin assignee:jcommelin	10-79137 10 days ago	47-46232 47 days ago	0-58585 16 hours
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	10-59923 10 days ago	44-80441 44 days ago	0-18707 5 hours
36401	JovanGerb author:JovanGerb	feat(positivity): positivity extension for `a - b`	This PR adds support in `positivity` for proving things about subtraction. For example, if the goal is `0 < a - b`, and there is a local hypothesis of type `b < a`, then we close the goal. The motivation is that we want `positivity` to be a flexible tactic. So, when trying to prove `0 < a - b` using a local hypothesis, we should look for the simp normal form of this, which is `b < a`. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Can.20I.20make.20positivity.20work.20for.20this.3F/near/578277240) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-zulip	63/26	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/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Tactic/Positivity/Basic.lean,MathlibTest/positivity.lean	10	8	['JovanGerb', 'github-actions', 'hrmacbeth', 'j-loreaux', 'joneugster', 'leanprover-radar']	joneugster assignee:joneugster	10-7933 10 days ago	10-21741 10 days ago	17-57303 17 days
36087	matthewjasper author:matthewjasper	chore: fix diamonds for Real/Complex Algebra instances	Unfold or make `implicit_reducible` some definitions used to define `Algebra ℝ ℂ` . This should allow reducing use of `set_option backward.isDefEq.respectTransparency false`. --- - [x] depends on: #36694 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	24/19	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/LinearAlgebra/Complex/Module.lean,MathlibTest/instance_diamonds.lean	7	8	['eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'matthewjasper']	eric-wieser assignee:eric-wieser	7-80243 7 days ago	9-9199 9 days ago	11-84307 11 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	7	['SnirBroshi', 'TwoFX', 'eric-wieser', 'github-actions', 'linesthatinterlace', 'mathlib-merge-conflicts']	TwoFX assignee:TwoFX	7-10962 7 days ago	130-44833 130 days ago	35-84279 35 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	614-43891 1 year ago	664-22293 664 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	614-43890 1 year ago	854-33786 854 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	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	614-43889 1 year ago	889-9386 889 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	614-43889 1 year ago	668-60397 668 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	614-43888 1 year ago	886-29888 886 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	600-37433 1 year ago	726-46270 726 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	596-278 1 year ago	659-76264 659 days ago	1-84718 1 day
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	596-36 1 year ago	682-10020 682 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	595-21190 1 year ago	630-27412 630 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	593-23464 1 year ago	712-15092 712 days ago	19-74546 19 days
17127	astrainfinita author:astrainfinita	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	553-58529 1 year ago	553-58529 553 days ago	4-72805 4 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	516-53995 1 year ago	516-53995 516 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	496-30750 1 year ago	496-30750 496 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	494-6827 1 year ago	494-6827 494 days ago	3-72207 3 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	482-58896 1 year ago	482-58896 482 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	454-75070 1 year ago	454-75070 454 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	448-19702 1 year ago	448-19702 448 days ago	6-66637 6 days
18474	astrainfinita author:astrainfinita	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	446-6732 1 year ago	446-6732 446 days ago	76-67978 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	433-30989 1 year ago	433-30989 433 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	397-17010 1 year ago	397-17010 397 days ago	16-76141 16 days
18470	astrainfinita author:astrainfinita	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	392-74837 1 year ago	392-74837 392 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	389-74569 1 year ago	571-40519 571 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	385-39265 1 year ago	385-39265 385 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	362-25412 11 months ago	362-25413 362 days ago	57-47357 57 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	362-25410 11 months ago	362-25412 362 days ago	36-69400 36 days
16314	astrainfinita author:astrainfinita	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	356-50376 11 months ago	356-50378 356 days ago	55-36935 55 days
15483	astrainfinita author:astrainfinita	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	355-81669 11 months ago	604-33599 604 days ago	4-79214 4 days
16594	astrainfinita author:astrainfinita	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	355-81445 11 months ago	560-34592 560 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	349-38286 11 months ago	362-48927 362 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	347-15061 11 months ago	347-15063 347 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	347-3758 11 months ago	347-3759 347 days ago	2-12017 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	314-10508 10 months ago	314-10510 314 days ago	35-30364 35 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	303-33335 9 months ago	303-33337 303 days ago	6-39812 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	291-25076 9 months ago	523-22975 523 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	291-25074 9 months ago	523-24618 523 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	291-25073 9 months ago	523-25260 523 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	288-7364 9 months ago	526-33580 526 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	275-58424 9 months ago	275-58424 275 days ago	40-60910 40 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	275-58178 9 months ago	275-58179 275 days ago	45-4562 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	275-57866 9 months ago	275-57866 275 days ago	18-21880 18 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	274-23295 9 months ago	274-23296 274 days ago	69-52361 69 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	272-39244 8 months ago	272-39244 272 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	245-36506 8 months ago	275-58175 275 days ago	38-26044 38 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	243-73859 8 months ago	243-73859 243 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	238-19962 7 months ago	238-19963 238 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	238-19591 7 months ago	238-19592 238 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	236-34215 7 months ago	236-34216 236 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	235-75411 7 months ago	235-75411 235 days ago	71-28496 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	229-78891 7 months ago	229-78892 229 days ago	0-66771 18 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	228-21617 7 months ago	228-21618 228 days ago	2-47570 2 days
13795	astrainfinita author:astrainfinita	perf(Algebra/{Group, GroupWithZero, Ring}/InjSurj): reduce everything	--- - [ ] depends on: #15192 - [ ] depends on: #15476 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	340/194	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,scripts/noshake.json	9	37	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	227-27688 7 months ago	356-42693 356 days ago	47-81764 47 days
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	226-75333 7 months ago	226-75334 226 days ago	13-49738 13 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	226-54653 7 months ago	249-30575 249 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	226-54607 7 months ago	236-19651 236 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	226-16485 7 months ago	249-30576 249 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	221-59819 7 months ago	221-59820 221 days ago	13-2028 13 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	210-19765 6 months ago	210-19766 210 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	210-14804 6 months ago	265-44499 265 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	209-28655 6 months ago	266-49967 266 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	209-22516 6 months ago	209-22517 209 days ago	10-61840 10 days
27933	grunweg author:grunweg	chore(OrdNode): format code example in code blocks	Wrap them in code blocks (and unindent them; that indentation is not needed any more). This also avoids warnings from the linter in #27898. ------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	205-59549 6 months ago	205-59550 205 days ago	39-69478 39 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	203-34760 6 months ago	203-34761 203 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	194-46357 6 months ago	194-46358 194 days ago	19-81030 19 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	192-21467 6 months ago	273-21404 273 days ago	73-13048 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	189-11549 6 months ago	189-11550 189 days ago	0-4775 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	188-30951 6 months ago	283-38235 283 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	187-34176 6 months ago	279-43348 279 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	184-15891 6 months ago	354-74664 354 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	176-18022 5 months ago	176-18023 176 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	152-81020 5 months ago	152-81021 152 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	145-23224 4 months ago	145-23224 145 days ago	122-67006 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	138-45883 4 months ago	138-45884 138 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	138-45711 4 months ago	138-45712 138 days ago	177-42245 177 days
25974	scholzhannah author:scholzhannah	feat(Topology/Compactness/CompactlyCoherentSpace): compact coherentification (k-ification)	This PR defines the notion of turning an arbitrary topological space into a compactly coherent space. Compactly coherent spaces are commonly referred to as "compactly generated spaces" or "k-spaces" in the literature while the operation of turning a space into such as space is called the "k-ification". There are however three different notions that are described with this name. To disambiguate we use the names "compactly coherent space" and "compactcoherentification" here. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation of these notions. This PR continues the work from #25318. Original PR: https://github.com/leanprover-community/mathlib4/pull/25318 Co-authored-by: Floris van Doorn	merge-conflict t-topology large-import	174/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	5	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'scholzhannah']	ADedecker assignee:ADedecker	138-45543 4 months ago	138-45544 138 days ago	147-64645 147 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	138-45189 4 months ago	138-45190 138 days ago	133-24576 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	138-44884 4 months ago	138-44885 138 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	138-44731 4 months ago	138-44732 138 days ago	71-37436 71 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	138-44693 4 months ago	138-44694 138 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	138-44097 4 months ago	138-44098 138 days ago	54-85998 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	138-39118 4 months ago	138-39119 138 days ago	11-62509 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	138-18042 4 months ago	808-22795 808 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	138-17995 4 months ago	822-22973 822 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	138-17953 4 months ago	788-73097 788 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	138-17345 4 months ago	272-42354 272 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	132-64112 4 months ago	354-72862 354 days ago	2-85335 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	111-76896 3 months ago	133-26445 133 days ago	60-67125 60 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	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	9	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	91-11897 3 months ago	179-18193 179 days ago	0-2073 34 minutes
33561	kbuzzard author:kbuzzard	chore: cont -> continuous_toFun	This field is sometimes called `cont` and sometimes `continuous_toFun`. I noticed that the `continuity` tactic sometimes takes a lot longer to prove `cont` even if `continuous_toFun` is available so I thought I'd change them all to see if this speed up mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	171/149	Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/LpSpace.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/RCLike/Extend.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ContinuousAffineMap.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.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/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/VectorBundle/Basic.lean	66	5	['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib4-merge-conflict-bot']	nobody	88-78971 2 months ago	88-78972 88 days ago	2-81715 2 days
33435	astrainfinita author:astrainfinita	feat: algebra automorphisms of monoid algebras	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	53/3	Mathlib/Algebra/MonoidAlgebra/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	83-2484 2 months ago	83-2485 83 days ago	13-16290 13 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	80-21348 2 months ago	80-21349 80 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	78-32917 2 months ago	180-37821 180 days ago	25-78230 25 days
32546	anishrajeev author:anishrajeev	feat(ModelTheory): Prove compactness of the type space	Define the space of types and prove various topological properties of it (zero dimensional, totally separated, compact, baire). The goal is to formalize the proof of the Omitting Types Theorem - [ ] depends on: #32215	merge-conflict t-logic new-contributor	127/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	6	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	fpvandoorn assignee:fpvandoorn	76-12296 2 months ago	116-14992 116 days ago	3-84208 3 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	74-12141 2 months ago	147-63586 147 days ago	74-62390 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	65-61116 2 months ago	275-59340 275 days ago	72-50365 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	56-38570 1 month ago	275-61811 275 days ago	52-61657 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	53-6590 1 month ago	53-6591 53 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	50-69601 1 month ago	109-56990 109 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	50-38395 1 month ago	102-6220 102 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	50-14312 1 month ago	50-14312 50 days ago	0-2935 48 minutes
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	47-74840 1 month ago	47-74841 47 days ago	5-13758 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	47-74839 1 month ago	47-74839 47 days ago	4-79090 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	47-52473 1 month ago	47-52474 47 days ago	34-16498 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	47-32343 1 month ago	47-32344 47 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	42-49241 1 month ago	42-49241 42 days ago	30-23357 30 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	37-85975 1 month ago	37-85975 37 days ago	38-12430 38 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	35-30156 1 month ago	235-15566 235 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	31-29261 1 month ago	606-7431 606 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	31-29249 1 month ago	291-28988 291 days ago	91-69159 91 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	23-13952 23 days ago	138-45027 138 days ago	114-38193 114 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	21-42497 21 days ago	21-42498 21 days ago	26-74403 26 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 --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	110/1	Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	5	18	['Rida-Hamadani', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	18-70444 18 days ago	18-70444 18 days ago	13-56327 13 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	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	17-17687 17 days ago	52-77200 52 days ago	0-963 16 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	merge-conflict LLM-generated	217/579	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/CompleteLattice/Finset.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Tactic/SetLike.lean	7	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-17684 17 days ago	52-78179 52 days ago	0-918 15 minutes
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	17-12924 17 days ago	17-12925 17 days ago	24-18556 24 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	16-22319 16 days ago	91-879 91 days ago	21-3598 21 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	11-9048 11 days ago	17-12915 17 days ago	15-54679 15 days
37073	kim-em author:kim-em	feat: add normalize_instance% using core's normalizeInstance	This PR adds a new `normalize_instance%` term elaborator that delegates to Lean core's `normalizeInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `normalize_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.normalizeInstance`. 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	merge-conflict	88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/Order/Ring/StandardPart.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/NumberTheory/NumberField/InfiniteAdeleRing.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	18	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	10-59899 10 days ago	10-59900 10 days ago	2-73508 2 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	8-55458 8 days ago	8-55459 8 days ago	59-67698 59 days
35415	joneugster author:joneugster	feat(Cache): enable partial cache in downstream projects	Migrated to fork from: #21238. Add features to `cache` and cleanup code: * 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 merge-conflict	34/15	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	6-49123 6 days ago	6-49124 6 days ago	34-10038 34 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 merge-conflict	14/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean	2	8	['Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	YaelDillies assignee:YaelDillies	5-10256 5 days ago	5-10257 5 days ago	34-33918 34 days
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	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	8	['SnirBroshi', 'felixpernegger', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	4-23081 4 days ago	4-35469 4 days ago	0-66443 18 hours
36613	dagurtomas author:dagurtomas	refactor(CategoryTheory): one-field structure morphisms in the category of types	This PR refactors the category structure on types as follows: We define the one-field structure `TypeCat.Fun` to wrap a function between types, and a `FunLike` instance on it. Then we define a one-field structure `TypeCat.Hom` which wraps a `Fun`. The morphisms in the category `Type u` are defined to be `TypeCat.Hom`, and the `FC` parameter of the `ConcreteCategory` instance is `TypeCat.Fun`. This double nesting allows us to avoid defining a `FunLike` instance on bare functions, which would give two non-reducibly-defeq coercions from morphisms in `Type u` to functions. To promote a function to a morphism in this category, we provide the abbreviation `TypeCat.ofHom f`, as well as a corresponding notation `↾ f`. (Entered as `\upr`.) In the process, we deprecate some declarations that were written specifically for the category of types, such as `FunctorToType.map_comp_apply` and others, which can now be generated by `elementwise`. --- - [ ] depends on: #36834 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	3431/2887	Mathlib.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.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/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.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/MonCat/Yoneda.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean,Mathlib/AlgebraicGeometry/Cover/Directed.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/AlgebraicGeometry/Normalization.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Sites/ConstantSheaf.lean,Mathlib/AlgebraicGeometry/Sites/MorphismProperty.lean,Mathlib/AlgebraicGeometry/Sites/Representability.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/Quasicategory/StrictSegal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/Dimension.lean,Mathlib/AlgebraicTopology/SimplicialSet/Finite.lean,Mathlib/AlgebraicTopology/SimplicialSet/HoFunctorMonoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homotopy.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveNondegenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/Op.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/RelativeMorphism.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/TopAdj.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Adjunction/Limits.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Category/Cat/Limit.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/CategoryTheory/Category/Pointed.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CofilteredSystem.lean,Mathlib/CategoryTheory/Comma/Presheaf/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Elementwise.lean	304	128	['Garmelon', 'JovanGerb', 'bryangingechen', 'dagurtomas', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	3-75667 3 days ago	3-75668 3 days ago	0-26087 7 hours
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	3-33692 3 days ago	724-17078 724 days ago	0-1223 20 minutes
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/)	merge-conflict	86/65	Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	1-27374 1 day ago	1-27375 1 day ago	3-33124 3 days
35518	kim-em author:kim-em	chore: forbid prime (') in filenames, rename LinearCombination'	This PR renames `Mathlib/Tactic/LinearCombination'.lean` to `LinearCombinationPrime.lean` (and the corresponding test file), and adds a lint check to `modulesOSForbidden` to prevent future files with prime/apostrophe characters in their names. The `'` character in filenames causes shell escaping issues in scripts (any `find ... -name '*.lean'` or similar pattern needs careful quoting to handle these files correctly). 🤖 Prepared with Claude Code	file-removed t-meta LLM-generated merge-conflict	13/8	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombinationPrime.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination_prime.lean	6	8	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	1-20109 1 day ago	1-20109 1 day ago	25-42954 25 days
37293	peabrainiac author:peabrainiac	feat(Order/Partition): finite meets of partitions of frames	For any frame `α`, `Partition α` has finite meets: the meet of two partitions `P`, `Q` can be constructed as the partition consisting of all meets `p ⊓ q` with `p ∈ P`, `q ∈ Q` and `p ⊓ q ≠ ⊥`. Note that even for frames `Partition α` does not have arbitrary meets: for example, there is no finest partition on the frame of open subsets of the Cantor space. We thus have to construct the remaining operations by hand instead of e.g. just transporting a `CompleteLattice` instance along some Galois connection. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	44/2	Mathlib/Order/Partition/Basic.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	1-2217 1 day ago	1-2217 1 day ago	8-72451 8 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	384/0	Mathlib.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/DeltaSystem.lean,Mathlib/SetTheory/Cardinal/Pigeonhole.lean,docs/references.bib	6	6	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	0-53942 14 hours ago	27-86091 27 days ago	15-9493 15 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	599-36281 1 year ago	629-83263 629 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	595-21190 1 year ago	630-27412 630 days ago	56-40668 56 days
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	581-82425 1 year ago	613-41684 613 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	559-7084 1 year ago	646-82431 646 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	551-3062 1 year ago	566-31136 566 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	551-3062 1 year ago	566-31137 566 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	551-3061 1 year ago	566-26887 566 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	541-49612 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	533-25719 1 year ago	682-7817 682 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	516-53995 1 year ago	516-53995 516 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	514-10116 1 year ago	549-85828 549 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	509-48948 1 year ago	523-35136 523 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	479-71365 1 year ago	506-32747 506 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	446-6977 1 year ago	538-84947 538 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	445-26063 1 year ago	566-37224 566 days ago	9-13962 9 days
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	444-78382 1 year ago	484-77995 484 days ago	33-8818 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	441-39562 1 year ago	441-39562 441 days ago	69-24210 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	440-13641 1 year ago	445-67442 445 days ago	27-52347 27 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	433-30989 1 year ago	433-30989 433 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	420-74699 1 year ago	427-39216 427 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	416-22398 1 year ago	423-34020 423 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	410-77569 1 year ago	410-77569 410 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	397-17010 1 year ago	397-17010 397 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	389-12836 1 year ago	572-16065 572 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	370-48235 1 year ago	395-77191 395 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	365-43224 1 year ago	559-20595 559 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	362-29144 11 months 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	362-25412 11 months ago	362-25413 362 days ago	57-47357 57 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	361-28140 11 months ago	436-20340 436 days ago	5-6208 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	353-85738 11 months ago	437-9806 437 days ago	8-45680 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	353-81870 11 months ago	433-72843 433 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	338-46309 11 months 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	335-78988 11 months ago	605-15773 605 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	330-38167 10 months ago	330-38167 330 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	314-10508 10 months ago	314-10510 314 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	303-68861 9 months ago	687-10114 687 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	296-61414 9 months ago	435-12995 435 days ago	27-62333 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	275-58175 9 months ago	308-33292 308 days ago	6-44784 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	249-30315 8 months ago	786-23241 786 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	245-36506 8 months ago	275-58175 275 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	244-38527 8 months ago	517-47096 517 days ago	0-1609 26 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	239-42068 7 months ago	440-16883 440 days ago	9-59130 9 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	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	236-33938 7 months ago	384-18820 384 days ago	0-1302 21 minutes
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	233-31752 7 months ago	447-23722 447 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	230-53564 7 months ago	233-39093 233 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	228-3672 7 months ago	450-60631 450 days ago	43-22586 43 days
28095	Equilibris author:Equilibris	Univ generic corec	Draft PR: Adding variable universe corecursor for PFunctor --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	321/70	Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/TypeVec.lean	3	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	226-75334 7 months ago	unknown	0-0 0 seconds
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	226-75333 7 months ago	226-75334 226 days ago	13-49738 13 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	226-54653 7 months ago	249-30575 249 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	226-16485 7 months ago	249-30576 249 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	226-16246 7 months ago	255-13943 255 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	209-74014 6 months ago	210-18717 210 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	209-22516 6 months ago	209-22517 209 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	207-18238 6 months ago	298-26076 298 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	194-21716 6 months ago	206-26079 206 days ago	0-1498 24 minutes
29657	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add Markov categories	This PR adds Markov categories to the category theory library. A Markov category is a symmetric monoidal category where every object has canonical copy and delete morphisms that form commutative comonoids. ## What this gives mathlib In a Markov category, morphisms model probabilistic processes. The copy morphism `X → X ⊗ X` creates perfect correlation (both outputs always equal). The delete morphism `X → I` marginalizes (sums/integrates out variables). This structure captures probability theory categorically. The same theorem proves results for: - Finite probability (stochastic matrices) - Measure theory (Markov kernels) - Kleisli categories of probability monads Fritz (2020) used this to prove categorical versions of Fisher-Neyman, Basu's theorem, and other core statistics results. ## Implementation - `MarkovCategory`: Extends `SymmetricCategory` with canonical comonoid structure - `copyMor X : X ⟶ X ⊗ X` and `delMor X : X ⟶ I` for each object - Coherence axioms: commutativity, counitality, coassociativity - Compatibility with tensor products Key design point: The comonoid structure is canonical (fields of the typeclass), not chosen. This matches the probability interpretation where there's exactly one way to copy/marginalize. ## Examples included 1. Cartesian categories: Every cartesian monoidal category forms a Markov category where copy is the diagonal `x ↦ (x,x)` and delete is the terminal morphism. All morphisms are deterministic. 2. FinStoch: Objects are finite types. Morphisms are stochastic matrices (rows sum to 1). This models finite probability spaces with the usual matrix multiplication for composition. ## Scope and review notes This PR provides the basic structure only. Future PRs would add: - Conditional independence - Sufficient statistics - Connection to measure-theoretic probability - More examples (Kleisli categories, Gaussian categories) I'm neither an expert in this material nor in Lean; I've only read a few papers on Markov categories and have gone through tutorial material in Lean. Please review for mathematical correctness and idiomatic Lean. I kept this PR small to check if mathlib wants this addition and to ensure it meets repository standards. ## Why add this now Markov categories provide a useful abstraction level for probability in type theory. Adding it to mathlib enables future work on categorical probability and statistics. In particular, I'm working on a probabilistic programming library and would like to write some proofs using these constructs. ## References - Fritz, T. (2020). [A synthetic approach to Markov kernels, conditional independence and theorems on sufficient statistics](https://arxiv.org/abs/1908.07021). Advances in Mathematics, 370, 107239. - Cho, K., & Jacobs, B. (2019). [Disintegration and Bayesian inversion via string diagrams](https://arxiv.org/abs/1709.00322). Mathematical Structures in Computer Science, 29(7), 938-971. --- All definitions include docstrings. The PR has tests for the core functionality. [![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	2414/7	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Braided.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/CopyDiscard.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Markov.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/CommComon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	16	28	['github-actions', 'jcreinhold', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	193-22547 6 months ago	198-28671 198 days ago	0-10638 2 hours
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	189-36760 6 months ago	290-46160 290 days ago	0-47289 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	184-2506 6 months ago	184-2506 184 days ago	46-26438 46 days
29926	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add basic finite stochastic matrices definitions to Markov category	This PR introduces FinStoch, the category of finite stochastic matrices, as a concrete example of a Markov category. This PR builds on #29925, #29939, and #29919 and was split up from #29657. ## Main additions ### 1. Core definitions (`FinStoch/Basic.lean`) - `StochasticMatrix m n`: Matrices where rows sum to 1, representing conditional probabilities P(j\|i) - `FinStoch`: The category with finite types as objects and stochastic matrices as morphisms - `DetMorphism`: Deterministic matrices (exactly one 1 per row) with their underlying functions - Composition: Matrix multiplication preserves row-stochasticity via the Chapman-Kolmogorov equation Key design choices: - Row-stochastic convention: entry (i,j) is P(output=j \| input=i) - Deterministic morphisms tracked separately for structural isomorphisms ### 2. Monoidal structure (`FinStoch/Monoidal.lean`) Implements tensor products modeling independent parallel processes: - Tensor on objects: Cartesian product of finite types - Tensor on morphisms: Kronecker product P((j₁,j₂)\|(i₁,i₂)) = P(j₁\|i₁) × P(j₂\|i₂) - Structural morphisms: Associator, unitors use deterministic permutations - Coherence**: Pentagon and triangle identities verified computationally ## Mathematical significance FinStoch provides the canonical example of a Markov category: - Morphisms: Stochastic matrices/Markov chains - Composition: Chapman-Kolmogorov equation for multi-step transitions - Tensor: Independent parallel processes This models finite probability spaces categorically, where: - Objects represent sample spaces - Morphisms represent probabilistic transitions - Tensor products model independence ## References Fritz (2020) - [ ] depends on: #29925	merge-conflict t-category-theory new-contributor	1437/0	Mathlib.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	9	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	178-12961 5 months ago	unknown	0-0 0 seconds
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	178-11811 5 months ago	568-39360 568 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	168-22061 5 months ago	168-22061 168 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	166-71993 5 months ago	166-71993 166 days ago	148-3338 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	165-9025 5 months ago	165-9093 165 days ago	0-83 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	160-41464 5 months ago	176-16140 176 days ago	47-58551 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	160-33194 5 months ago	181-15823 181 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	160-33192 5 months ago	181-13692 181 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	154-32715 5 months ago	154-32715 154 days ago	41-53612 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	153-52245 5 months ago	153-52245 153 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	151-12513 5 months ago	272-13883 272 days ago	0-267 4 minutes
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	144-61904 4 months ago	184-40570 184 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	139-79036 4 months ago	559-20024 559 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	139-8877 4 months ago	484-58807 484 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	138-46734 4 months ago	821-71629 821 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	138-46470 4 months ago	588-38556 588 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	138-46468 4 months ago	559-21604 559 days ago	26-40037 26 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	138-46339 4 months ago	614-12570 614 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	138-46185 4 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	138-46183 4 months ago	517-11586 517 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	138-46045 4 months ago	335-78974 335 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	138-45905 4 months ago	365-29860 365 days ago	50-8745 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	138-45899 4 months ago	385-39912 385 days ago	20-81771 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	138-45890 4 months ago	404-79892 404 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	138-45877 4 months ago	366-60994 366 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	138-45724 4 months ago	224-44305 224 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	138-45575 4 months ago	280-69138 280 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 `variation μ = μ`. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26160 --- [![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-measure-probability	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-45386 4 months ago	275-40341 275 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 merge-conflict awaiting-author t-analysis	468/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	3	21	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	138-45363 4 months ago	235-7353 235 days ago	44-77065 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	138-45215 4 months ago	254-2573 254 days ago	25-5689 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	138-45210 4 months ago	167-34020 167 days ago	62-14616 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	138-45173 4 months ago	265-32782 265 days ago	0-287 4 minutes
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	138-45018 4 months ago	249-16181 249 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	138-45016 4 months ago	247-77243 247 days ago	0-5814 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	138-44884 4 months ago	138-44885 138 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	138-44870 4 months ago	232-85098 232 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	138-44731 4 months ago	138-44732 138 days ago	71-37436 71 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	138-44097 4 months ago	138-44098 138 days ago	54-85998 54 days
30230	CoolRmal author:CoolRmal	feat(MeasureTheory): Basic properties of the integral against a vector measure with a bilinear form.	Create a folder named Integral in the folder about vector measures. Define the integral of a function against a vector measure with a bilinear form, and prove that integral is a linear operator on functions, bilinear forms, and vector measures, respectively. Several useful lemmas are added into the file about variations of a vector measure (e.g. triangle inequality). --- - [ ] depends on: #28499 [![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-measure-probability	1353/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/L1.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-43928 4 months ago	unknown	0-0 0 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	138-40929 4 months ago	582-34043 582 days ago	48-65595 48 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	138-17945 4 months ago	767-71790 767 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	138-17792 4 months ago	501-24671 501 days ago	15-38473 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	138-17729 4 months ago	474-34978 474 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	138-17702 4 months ago	430-82916 430 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	138-17585 4 months ago	350-16520 350 days ago	8-27909 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	138-17268 4 months ago	167-4403 167 days ago	74-62001 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	138-17247 4 months ago	238-56314 238 days ago	0-454 7 minutes
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	138-17136 4 months ago	205-18206 205 days ago	0-1063 17 minutes
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	138-17048 4 months ago	228-77951 228 days ago	0-581 9 minutes
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	138-3444 4 months ago	138-3444 138 days ago	138-3922 138 days
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	t-algebra new-contributor label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	136-1754 4 months ago	136-906 136 days ago	0-1498 24 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	135-25593 4 months ago	135-25182 135 days ago	31-49241 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	131-59635 4 months ago	132-28647 132 days ago	6-25774 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	129-46015 4 months ago	129-46015 129 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	128-83556 4 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	122-17992 4 months ago	134-71205 134 days ago	0-34649 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	122-4754 4 months ago	130-48297 130 days ago	39-49182 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	122-4630 4 months ago	131-27056 131 days ago	16-82714 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	122-232 4 months ago	304-26576 304 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	119-25465 3 months ago	119-25465 119 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	113-17571 3 months ago	113-17571 113 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	108-40973 3 months ago	108-41013 108 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	107-75742 3 months ago	107-75742 107 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	107-21539 3 months ago	166-72507 166 days ago	54-75088 54 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	31	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	sgouezel assignee:sgouezel	105-43962 3 months ago	111-1880 111 days ago	98-51478 98 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	104-54204 3 months ago	104-59489 104 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	104-54096 3 months ago	104-59263 104 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	104-54012 3 months ago	104-59075 104 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	104-51684 3 months ago	104-51685 104 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	104-51682 3 months ago	104-51683 104 days ago	0-1431 23 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	104-51681 3 months ago	104-51682 104 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	104-51679 3 months ago	104-51680 104 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	104-51676 3 months ago	104-51679 104 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	104-51675 3 months ago	104-51676 104 days ago	0-2387 39 minutes
33178	gw90 author:gw90	feat(Analysis/CStarAlgebra/Spectrum): Adding lemmas that the CStarAlgebra norm equals the square root of the spectral radius of star a * a	Adds lemmas that the \|\|a\|\|^2_A=sqrt(spectralRadius C (star a * a)). I think it would be helpful to have these lemmas available in Mathlib. It'll help with some of the other things I'm working on. Feel free to move them to a different file or rename them as you see fit.	new-contributor t-analysis awaiting-author	24/0	Mathlib/Analysis/CStarAlgebra/Spectrum.lean	1	15	['github-actions', 'gw90', 'themathqueen', 'vihdzp']	nobody	104-3543 3 months ago	105-65562 105 days ago	0-15209 4 hours
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	100-80161 3 months ago	123-83618 123 days ago	3-49892 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	100-10413 3 months ago	100-10413 100 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	100-3363 3 months ago	100-3363 100 days ago	5-82139 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	94-31554 3 months ago	94-31554 94 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	92-84878 3 months ago	92-84879 92 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	91-1476 3 months ago	538-48713 538 days ago	9-73631 9 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	88-19976 2 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	88-11782 2 months ago	88-11782 88 days ago	13-42146 13 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	28	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	84-4550 2 months ago	84-4771 84 days ago	22-22665 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	82-55535 2 months ago	82-52163 82 days ago	0-3444 57 minutes
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	80-22881 2 months ago	80-31403 80 days ago	93-10641 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	78-32961 2 months ago	215-64745 215 days ago	0-396 6 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 blocked-by-other-PR merge-conflict new-contributor	160/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	8	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	76-12346 2 months ago	84-26170 84 days ago	10-38484 10 days
32546	anishrajeev author:anishrajeev	feat(ModelTheory): Prove compactness of the type space	Define the space of types and prove various topological properties of it (zero dimensional, totally separated, compact, baire). The goal is to formalize the proof of the Omitting Types Theorem - [ ] depends on: #32215	merge-conflict t-logic new-contributor	127/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	6	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	fpvandoorn assignee:fpvandoorn	76-12296 2 months ago	116-14992 116 days ago	3-84208 3 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	74-16104 2 months ago	75-83940 75 days ago	1-23617 1 day
34129	idontgetoutmuch author:idontgetoutmuch	feat: define Ehresmann connections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	90/0	Mathlib.lean,Mathlib/Geometry/Manifold/EhresmannConnection.lean	2	5	['github-actions', 'grunweg', 'idontgetoutmuch', 'metakunt']	nobody	73-37654 2 months ago	77-16540 77 days ago	0-1188 19 minutes
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	69-8629 2 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	67-84602 2 months ago	129-15167 129 days ago	8-14810 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	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	5	['chiyunhsu', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	67-21723 2 months ago	67-21723 67 days ago	42-22427 42 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	66-44130 2 months ago	75-28145 75 days ago	2-6824 2 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	64-81935 2 months ago	118-82373 118 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	64-34366 2 months ago	182-71335 182 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	64-34359 2 months ago	182-76988 182 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	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	9	['ADedecker', 'LTolDe', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	64-34133 2 months ago	90-18265 90 days ago	11-7507 11 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	64-26074 2 months ago	161-17520 161 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	64-24841 2 months ago	139-68044 139 days ago	0-150 2 minutes
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	186/1	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	5	['NickAdfor', 'github-actions', 'jcommelin']	kmill assignee:kmill	64-24573 2 months ago	66-25470 66 days ago	26-1427 26 days
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	62-3094 2 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	61-62270 2 months ago	62-12723 62 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	61-39983 2 months ago	91-23846 91 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	59-85408 2 months ago	63-17148 63 days ago	0-2854 47 minutes
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	59-32345 2 months ago	59-32345 59 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	57-68584 1 month ago	57-68584 57 days ago	35-16104 35 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	55-17058 1 month ago	88-39926 88 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 - [ ] depends on: #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-measure-probability merge-conflict	916/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	5	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	54-84447 1 month ago	275-40314 275 days ago	15-65390 15 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	54-408 1 month ago	82-15512 82 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	53-28941 1 month ago	98-21488 98 days ago	5-47362 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	52-80031 1 month ago	57-69351 57 days ago	5-38408 5 days
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	52-27708 1 month ago	52-74937 52 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	51-10088 1 month ago	61-29345 61 days ago	6-49759 6 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	50-68772 1 month ago	364-15038 364 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	50-38395 1 month ago	102-6220 102 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	50-7580 1 month ago	200-19356 200 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	50-3203 1 month ago	197-37031 197 days ago	20-70133 20 days
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	48-18325 1 month ago	48-18425 48 days ago	39-79348 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	48-17973 1 month ago	48-18727 48 days ago	39-33072 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	48-16834 1 month ago	48-18032 48 days ago	1-24662 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	48-12591 1 month ago	48-12797 48 days ago	39-9588 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	47-68865 1 month ago	47-68865 47 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	47-52609 1 month ago	98-30882 98 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	47-32343 1 month ago	47-32344 47 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	45-30129 1 month ago	45-30129 45 days ago	13-78266 13 days
35620	inaciovasquez2020 author:inaciovasquez2020	feat(Fintype): choose element from nonempty finite type	This PR adds a noncomputable choice function for finite types with nonzero cardinality. * `Fintype.chooseOfCardNeZero` provides a witness of `α` from `[Fintype α]` assuming `Fintype.card α ≠ 0`. * A regression test is included in `MathlibTest/Fintype/ChooseOfCardNeZero.lean`. The construction follows existing mathlib choice patterns and is explicitly marked `noncomputable`.	t-data new-contributor	21/0	Mathlib.lean,Mathlib/Data/Fintype/Choose.lean,MathlibTest/Fintype/ChooseOfCardNeZero.lean	3	4	['github-actions', 'plp127', 'vihdzp']	nobody	43-53265 1 month ago	43-69573 43 days ago	0-448 7 minutes
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	42-49241 1 month ago	42-49241 42 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	41-80938 1 month ago	117-81808 117 days ago	2-78371 2 days
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 awaiting-author	205/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	6	['github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-merge-conflict-bot', 'thefundamentaltheor3m', 'wwylele']	urkud assignee:urkud	40-81058 1 month ago	40-81058 40 days ago	34-11222 34 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	40-77274 1 month ago	99-84422 99 days ago	3-73599 3 days
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	40-64355 1 month ago	41-292 41 days ago	0-479 7 minutes
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	39-39279 1 month ago	385-17218 385 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	39-39263 1 month ago	336-21157 336 days ago	39-61332 39 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	38-77103 1 month 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	38-59292 1 month ago	303-2191 303 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	38-56818 1 month ago	54-26064 54 days ago	0-531 8 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	38-23590 1 month ago	327-6062 327 days ago	17-16443 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	38-21271 1 month ago	44-8644 44 days ago	0-103 1 minute
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	37-85975 1 month ago	37-85975 37 days ago	38-12430 38 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	36-26781 1 month ago	41-996 41 days ago	0-306 5 minutes
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	35-60986 1 month ago	279-40719 279 days ago	13-85893 13 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	35-33916 1 month ago	48-21921 48 days ago	0-3706 1 hour
33790	eliasjudin author:eliasjudin	feat(CategoryTheory/Preadditive/Mat): add natural transformation and isomorphism extension theorems	Add extensionality lemmas for natural transformations and comparisons `L ≅ Mat_.lift F` in the additive envelope `Mat_`. - Add `Mat_.natTrans_ext`: a natural transformation `F ⟶ G` between functors `Mat_ C ⥤ D` (with `G` additive) is determined by its components on objects of the form `(embedding C).obj X`. - Add `Mat_.liftIso_ext_comp_embeddingLiftIso`: a small uniqueness lemma for comparisons `L ≅ lift F`. These lemmas streamline arguments around the universal property of `Mat_` by reducing equalities to components on objects coming from `C` via `embedding C`. No new instances or simp attributes; only `Mathlib/CategoryTheory/Preadditive/Mat.lean` changes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	68/20	Mathlib/CategoryTheory/Preadditive/Mat.lean	1	15	['eliasjudin', 'github-actions', 'joelriou', 'kim-em', 'mathlib-merge-conflicts']	nobody	35-15493 1 month ago	87-3891 87 days ago	0-25088 6 hours
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	34-46454 1 month ago	209-42804 209 days ago	27-52841 27 days
35576	Tehlikeli107 author:Tehlikeli107	⚡ [performance] Pre-compile regexes in lake-build-wrapper.py	- Pre-compile `file_info_re` and `progress_re` in `BuildOutputProcessor.__init__` to avoid repeated compilation overhead. - Replace `re.sub(r'\.', '/', target)` with `target.replace('.', '/')` for better performance when converting module names to file paths. These changes result in a measured ~40% performance improvement in the core processing logic of the wrapper script. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-author CI new-contributor merge-conflict	8/707	scripts/bench/README.md,scripts/bench/build/README.md,scripts/bench/build/fake-root/bin/lean,scripts/bench/build/fake-root/bin/lean.py,scripts/bench/build/lakeprof_report_template.html,scripts/bench/build/lakeprof_report_upload.py,scripts/bench/build/run,scripts/bench/combine.py,scripts/bench/lint/README.md,scripts/bench/lint/run,scripts/bench/measure.py,scripts/bench/open-mathlib/README.md,scripts/bench/open-mathlib/run,scripts/bench/repeatedly.py,scripts/bench/run,scripts/bench/size/README.md,scripts/bench/size/run,scripts/bench/size/run.py,scripts/lake-build-wrapper.py	19	7	['bryangingechen', 'felixpernegger', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	34-39540 1 month ago	45-5813 45 days ago	0-8924 2 hours
36000	eliasjudin author:eliasjudin	add reindexing, fibers pseudofunctor, internal categories, and single-morphism descent	## Summary - FiberedCategory: `PseudofunctorOfFibers.lean` (pseudofunctor of fibers for a fibered category), `Reindexing.lean` (reindexing functors and coherence isos) - InternalCategory: `Basic.lean` (minimal internal category structure over a category with pullbacks) - Sites/Descent: `SingleMorphism.lean` (descent data and comparison functor for a single morphism; `IsDescentMorphism` / `IsEffectiveDescentMorphism`) - Mathlib.lean: import updates Naming follows mathlib convention (e.g. `singleMorphismComparisonFunctor` in lowerCamelCase for definitions).	t-category-theory new-contributor	783/0	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/PseudofunctorOfFibers.lean,Mathlib/CategoryTheory/FiberedCategory/Reindexing.lean,Mathlib/CategoryTheory/InternalCategory/Basic.lean,Mathlib/CategoryTheory/Sites/Descent/SingleMorphism.lean	5	5	['eliasjudin', 'github-actions', 'joelriou', 'mathlib-bors']	nobody	34-36617 1 month ago	34-39635 34 days ago	0-42869 11 hours
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	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	79	['botbaki-review', 'github-actions', 'grunweg', 'michaellee94', 'ocfnash']	ocfnash assignee:ocfnash	32-16714 1 month ago	33-83027 33 days ago	15-3412 15 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	32-5821 1 month ago	unknown	0-0 0 seconds
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	31-29280 1 month ago	623-81704 623 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	31-18248 1 month ago	80-46775 80 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	31-13955 1 month ago	54-1149 54 days ago	0-1418 23 minutes
35436	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Monoidal/Closed): Prove the isomorphism of internal hom objects C(x \otimes y, z) and C(y, C(x, z))	Prove the currying-uncurrying isomorphism `C(x \otimes y, z) \iso C(y, C(x, z))` between internal hom objects of a closed monoidal category `C`. --- This result is connected to the infinity-cosmos project, and is used to prove that a closed monoidal category enriched in itself admits all cotensors. ~Line 81 currently contains a one-line proof in tactics mode `exact rfl`. When trying to use `rfl` outside of tactics mode, an error is thrown~ (Fixed, thank you @robin-carlier!). Any help with this (or any other aspect of the formalization) is greatly appreciated! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos delegated	89/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Closed/InternalCurrying.lean	2	15	['dagurtomas', 'daniel-carranza', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	adamtopaz assignee:adamtopaz	31-5394 1 month ago	38-79933 38 days ago	7-67484 7 days
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']	kex-y assignee:kex-y	31-5358 1 month ago	31-5332 31 days ago	15-85459 15 days
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	31-5348 1 month ago	237-71894 237 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	30-73728 30 days ago	42-1977 42 days ago	47-76964 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	30-73483 30 days ago	81-12596 81 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	30-62203 30 days ago	45-44243 45 days ago	5-13145 5 days
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	3	['github-actions']	nobody	30-6456 30 days ago	30-9771 30 days ago	0-96 1 minute
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	26-51484 26 days ago	38-83729 38 days ago	2-47211 2 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	25-74766 25 days ago	25-74492 25 days ago	0-364 6 minutes
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	25-56164 25 days ago	602-16603 602 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	25-39601 25 days ago	80-48460 80 days ago	10-65787 10 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	25-39057 25 days ago	805-10545 805 days ago	12-48883 12 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	24-28539 24 days ago	unknown	0-0 0 seconds
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	23-14043 23 days ago	602-43417 602 days ago	0-1791 29 minutes
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	23-14007 23 days ago	332-37303 332 days ago	72-3718 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	23-13906 23 days ago	82-6288 82 days ago	43-77956 43 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	23-13886 23 days ago	67-2127 67 days ago	59-63981 59 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_prime_coeff_eq_one`: for prime `p`, all coefficients of `cyclotomic p R` equal `1`. - `eq_nsmul_cyclotomic_of_nonneg_coeff`: a nonneg-coefficient polynomial vanishing at a primitive root is a positive scalar multiple of the cyclotomic polynomial. - `card_fiber_eq_card_div`: if a function `d : A → ZMod p` satisfies `∑ ζ^(d a) = 0`, then every fiber has cardinality `\|A\| / p`. These results are useful for combinatorial applications involving exponential sums and equidistribution over cyclic groups. Theorems imported from: https://github.com/Latinum-Agentic-Commerce/AlgebraicDesignTheory	t-ring-theory new-contributor awaiting-author	101/1	Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean	2	5	['github-actions', 'grunweg', 'ocfnash']	ocfnash assignee:ocfnash	21-20009 21 days ago	33-11349 33 days ago	9-45761 9 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.	t-algebra new-contributor awaiting-author label:t-algebra$	231/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/Probability/Markov/Stationary.lean	3	12	['dennj', 'dupuisf', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'riccardobrasca']	nobody	21-19860 21 days ago	38-61564 38 days ago	10-33013 10 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$	61/3	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/DistribLattice.lean	3	2	['github-actions']	nobody	21-19663 21 days ago	21-18453 21 days ago	0-2836 47 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	21-19604 21 days ago	unknown	0-0 0 seconds
34934	zorkary author:zorkary	feat(Data/List): add constructive split classifiers	## Summary This PR adds a small constructive list-classification utility module: - `Mathlib/Data/List/SplitClassify.lean` (new file) - `Mathlib.lean` (one new public import) The goal is to provide reusable case-data classifiers for common split equalities, so downstream proofs can branch on explicit structure instead of repeatedly rebuilding list-shape arguments. ## Added API - `List.append_cons_eq_singleton` - `List.ConsSplit` - `List.classify_cons_vs_split` - `List.SwapSplit` - `List.classify_swap_vs_split` ## Scope and non-goals - No existing theorem statements were changed. - No existing proof logic was modified. - This is a narrow additive change (new module + one import). ## Build I verified: - `lake build Mathlib.Data.List.SplitClassify` ## Duplicate/overlap check Before opening this PR, I checked local mathlib sources and GitHub search for likely overlap, including targeted searches for: - `classify_cons_vs_split` - `classify_swap_vs_split` - `append_cons_eq_singleton` - open PRs/issues around list split/classification helpers I did not find direct existing equivalents or open PRs with the same API. ## AI usage disclosure I used AI assistance (Codex/LLM) for drafting and implementation support. I understand the high-level intent and have validated the module builds. I am opening this as a draft specifically to get maintainer review on technical details before marking it ready.	t-data new-contributor LLM-generated	213/0	Mathlib.lean,Mathlib/Data/List/SplitClassify.lean	2	1	['github-actions']	nobody	21-19350 21 days 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	14	['copilot-pull-request-reviewer', 'github-actions', 'homeowmorphism', 'mathlib-bors', 'plp127', 'tb65536']	tb65536 assignee:tb65536	21-19253 21 days ago	31-82435 31 days ago	4-30999 4 days
36443	Fieldnote-Echo author:Fieldnote-Echo	feat(Combinatorics/SimpleGraph): add SimpleGraph.ball (open metric ball)	Add `SimpleGraph.ball`, the open ball in the graph extended metric. ## Design decisions - Open ball (strict `<`, not `≤`): `ball c ⊤` coincides with the connected component of `c`, whereas a closed ball would give `closedBall c ⊤ = univ`. - Named `SimpleGraph.ball` (not `eball`): since `dist`-valued balls are less natural for disconnected graphs, the `e` prefix is unnecessary. - Graph-specific (not via `PseudoEMetricSpace`): avoids importing `ℝ`. AI assistance: Claude (Opus 4.6) helped draft and iterate on the implementation. I reviewed the code line by line and vouch for the final contents. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/SimpleGraph.20metric.20balls/with/577846803). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	59/3	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	36	['Fieldnote-Echo', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'lauramonk', 'vlad902']	nobody	21-19032 21 days ago	27-17544 27 days ago	27-17534 27 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	12	['FrankieeW', 'MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts', 'tb65536']	MichaelStollBayreuth assignee:MichaelStollBayreuth	21-7976 21 days ago	27-25730 27 days ago	15-50831 15 days
36387	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): parameter uniqueness for quadratic fields	- [ ] depends on: #36347 ## 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` ---	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	21-7963 21 days ago	28-57535 28 days ago	0-2 2 seconds
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	32/18	Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	20	['chrisflav', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'sun123zxy']	chrisflav assignee:chrisflav	21-5846 21 days ago	21-8651 21 days ago	16-12398 16 days
34375	jvanwinden author:jvanwinden	feat(MeasureTheory/Function/AEEqOfLIntegral): introduce lemmas for rewriting a.e. inequalities	Introduce the following lemmas: - ae_le_const_iff_forall_gt_imp_ae_lt, - ae_const_le_iff_forall_lt_imp_ae_gt, - ae_le_const_iff_forall_gt_imp_ae_le, - ae_const_le_iff_forall_lt_imp_ae_ge, which can be used get an epsilon of room in a.e. inequalities, with the epsilon being outside the a.e. quantifier. The 'le/ge' variants require a dense ordering. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	24/0	Mathlib/MeasureTheory/Function/AEEqOfLIntegral.lean	1	10	['EtienneC30', 'github-actions', 'jvanwinden', 'urkud']	kex-y assignee:kex-y	20-83309 20 days ago	31-14888 31 days ago	41-4810 41 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	20-60577 20 days ago	20-59177 20 days ago	0-3928 1 hour
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	20-18312 20 days ago	26-78486 26 days ago	27-45743 27 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	20-17761 20 days ago	59-18715 59 days ago	0-83167 23 hours
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	20-17612 20 days ago	59-20525 59 days ago	2-23785 2 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	304/194	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	5	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	20-16935 20 days ago	59-18182 59 days ago	1-62439 1 day
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	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	20-5170 20 days ago	40-33163 40 days ago	0-45583 12 hours
36786	SproutSeeds author:SproutSeeds	feat(DoubleCounting): parity of odd-degree vertices in bipartite incidence	Adds `odd_card_filter_odd_bipartiteAbove_iff_odd_card_filter_odd_bipartiteBelow` to `Mathlib.Combinatorics.Enumerative.DoubleCounting`. This is the small parity-helper first step for #25231. Validation: - `lake build Mathlib.Combinatorics.Enumerative.DoubleCounting` Supersedes closed #36077 after replaying the helper cleanly on current `master`. AI usage: used Codex for branch recovery, replay onto current `master`, and draft wording; final code choices and verification by me.	new-contributor t-combinatorics large-import	17/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean	1	2	['github-actions']	nobody	19-64391 19 days ago	19-64474 19 days ago	19-64464 19 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	19-12066 19 days ago	74-19846 74 days ago	54-22055 54 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 label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	28	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-12039 19 days ago	105-11230 105 days ago	10-66980 10 days
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	19-12013 19 days ago	83-84757 83 days ago	16-55121 16 days
35652	dennj author:dennj	feat(LinearAlgebra/Matrix): add `Matrix.mul_eq_smul_one_symm`	## Summary - Add `Matrix.mul_eq_smul_one_symm`: if `M * N = c • 1` and `det M ≠ 0`, then `N * M = c • 1` - A scalar generalisation of `mul_eq_one_symm` (the `c = 1` case) to arbitrary scalars, requiring `IsDomain` and `det M ≠ 0` - The proof uses the adjugate identity `adjugate M * M = det M • 1` to derive `det M • (N * M) = det M • (c • 1)`, then cancels `det M` via `mul_left_cancel₀` Theorem imported from: https://github.com/Latinum-Agentic-Commerce/AlgebraicDesignTheory	t-algebra new-contributor awaiting-author LLM-generated label:t-algebra$	28/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	4	['dagurtomas', 'eric-wieser', 'github-actions', 'grunweg']	nobody	19-11890 19 days ago	25-19314 25 days ago	17-73114 17 days
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	19-11760 19 days ago	25-2373 25 days ago	8-31258 8 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` --- Builds on: #31121 Related to: #29639, #29643, #29646	awaiting-author t-algebra new-contributor label:t-algebra$	282/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	3	25	['github-actions', 'jessealama', 'joelriou', 'kim-em', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	18-80577 18 days ago	163-44412 163 days ago	35-45800 35 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	18-11248 18 days ago	26-16340 26 days ago	0-163 2 minutes
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	64/2	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	18-9170 18 days ago	18-9170 18 days ago	7-83579 7 days
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	278/49	Mathlib.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Filter/Germ/Product.lean	4	4	['alok', 'github-actions', 'plp127']	nobody	17-66977 17 days ago	unknown	0-0 0 seconds
36170	SproutSeeds author:SproutSeeds	feat(ContMDiff): add ContMDiff scalar-action typeclasses	Closes #5617 Following the API pattern of `ContinuousConstSMul` and `ContinuousSMul`, this PR adds a smoothness parameter `n` to `ContMDiffConstSMul` and `ContMDiffSMul`, factors the generic `ContMDiff` scalar-action API into a dedicated file, and keeps `NormedSpace` focused on the standard scalar/vector instance. It also adds the corresponding `const_smul` and `smul` lemmas (`WithinAt`, `At`, `On`, and global versions). Tools used: Codex 5.3 extra high ---	t-differential-geometry new-contributor awaiting-author LLM-generated	154/21	Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/Geometry/Manifold/ContMDiff/MulAction.lean,Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.lean	5	22	['SproutSeeds', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib-merge-conflicts', 'sgouezel']	PatrickMassot assignee:PatrickMassot	17-52982 17 days ago	26-51477 26 days ago	4-45581 4 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	332/0	Mathlib.lean,Mathlib/Topology/Category/TopCat/Closeds.lean	2	22	['Brian-Nugent', 'dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	17-15933 17 days ago	17-15933 17 days ago	17-63465 17 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	151/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Contraction.lean,Mathlib/Combinatorics/SimpleGraph/Minor.lean	3	7	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vbeffara']	YaelDillies assignee:YaelDillies	17-15127 17 days ago	18-23054 18 days ago	31-49634 31 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	17-7000 17 days ago	17-6953 17 days ago	60-20351 60 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 - [ ] 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	16-82524 16 days ago	280-21815 280 days ago	0-5139 1 hour
34709	dennj author:dennj	feat(Analysis/ODE): add discrete Grönwall inequality	## Summary Add discrete Grönwall inequality to `Mathlib/Analysis/ODE/DiscreteGronwall.lean` Provides bounds for recurrence inequalities of the form `u(n+1) ≤ c(n) * u(n) + b(n)` ### Main results - `discrete_gronwall_prod_general`: Product form working over any linearly ordered commutative ring - `prod_one_add_Ico_mono`: Auxiliary lemma for product comparisons over subintervals - `discrete_gronwall`: Classical exponential bound `u(n) ≤ (u(n₀) + ∑ b(k)) * exp(∑ c(i))` (ℝ-specific) - `discrete_gronwall_Ico`: Uniform bound over a finite interval (ℝ-specific) ## Related work Complements the continuous Grönwall inequality in `Mathlib.Analysis.ODE.Gronwall` ## References * Grönwall, T. H. (1919). "Note on the derivatives with respect to a parameter of the solutions of a system of differential equations". Annals of Mathematics, 20(4), 292–296.	t-analysis new-contributor LLM-generated awaiting-author merge-conflict	174/0	Mathlib.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean	2	12	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	16-80949 16 days ago	17-72 17 days ago	46-59271 46 days
35755	Vilin97 author:Vilin97	feat(Analysis/ODE): forward Euler method convergence	## Summary - Define the forward Euler method (`ODE.EulerMethod.step`, `point`, `slope`, `path`, `deriv`) in `Analysis/ODE/EulerMethod.lean`. - Prove the local truncation error bound `dist_deriv_le`: `dist(deriv(t), v(t, path(t))) ≤ h(L + KM)`. - Prove the global error bound `dist_path_le` via Gronwall's inequality. - Prove convergence `tendsto_path`: `path(v, h, t₀, y₀, t) → sol(t)` as `h → 0⁺`. ## Motivation The forward Euler method is the simplest numerical method for ODEs and a natural complement to the existing Gronwall inequality (`Mathlib.Analysis.ODE.Gronwall`) and Picard-Lindelöf theorem (`Mathlib.Analysis.ODE.PicardLindelof`). This formalization is based on the [forward_euler](https://github.com/Vilin97/forward_euler) project. Depends on #35753. --- 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).	new-contributor WIP LLM-generated merge-conflict	297/0	Mathlib.lean,Mathlib/Analysis/ODE/EulerMethod.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	4	4	['github-actions', 'mathlib-merge-conflicts']	nobody	16-42462 16 days ago	40-43555 40 days ago	0-674 11 minutes
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	16-24307 16 days ago	16-24307 16 days ago	2-67942 2 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	16-22319 16 days ago	91-879 91 days ago	21-3598 21 days
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	476/5	Mathlib.lean,Mathlib/AlgebraicTopology/InvarianceOfDomain.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Order.lean	5	2	['github-actions']	nobody	15-83742 15 days ago	15-83696 15 days ago	0-6854 1 hour
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	15-69906 15 days ago	34-35001 34 days ago	55-73479 55 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 merge-conflict	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	139	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	15-69882 15 days ago	25-39195 25 days ago	35-56704 35 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	127/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean	2	30	['SnirBroshi', 'SproutSeeds', 'github-actions', 'jcommelin', 'ksenono']	nobody	15-55951 15 days ago	15-55951 15 days ago	98-81589 98 days
36785	hommmmm author:hommmmm	feat(RingTheory/Localization): Nagata's criterion for primality in localization away	## Summary - Add `dvd_of_mem_span_singleton_localization`: if `p` is prime and `p ∤ x`, then membership in the span of the image of `x` in `R[1/p]` implies divisibility by `x`. - Add `prime_of_prime_in_localization` (Nagata's criterion): if `p` is prime, `x` is irreducible, and the image of `x` in `R[1/p]` is prime, then `x` is prime. ## References - [Stacks Project, Tag 0AFU](https://stacks.math.columbia.edu/tag/0afu) ## AI Disclosure This code is written without AI, then uses Claude Code with cameronfreer's [Lean4-skills](https://github.com/cameronfreer/lean4-skills) (specifically, the `review`, `refactor`, and `golf` workflow) for style changes, refactoring and golfing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	72/0	Mathlib.lean,Mathlib/RingTheory/Localization/Away/Prime.lean	2	4	['chrisflav', 'github-actions', 'hommmmm']	chrisflav assignee:chrisflav	15-1294 15 days ago	15-1294 15 days ago	19-27905 19 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	8	['SnirBroshi', 'github-actions', 'ksenono', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	14-78111 14 days ago	109-46597 109 days ago	0-136 2 minutes
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	t-algebra new-contributor label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	11	['Xxxjdjdid', 'banrovegrie', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	14-69859 14 days ago	60-18226 60 days ago	60-18216 60 days
36787	hommmmm author:hommmmm	feat(RingTheory/LocalRing): Krull dimension results for maximal ideal of local ring	## Summary This PR adds two results connecting the Krull dimension of a local ring to its maximal ideal: * `IsLocalRing.ringKrullDim_eq_zero_of_maximalIdeal_eq_bot`: A local ring whose maximal ideal is `⊥` has Krull dimension zero. * `IsLocalRing.exists_mem_maximalIdeal_not_mem_sq`: In a Noetherian local ring of positive Krull dimension, there exists an element in the maximal ideal that is not in its square. The second result follows from Nakayama's lemma: if every element of the maximal ideal `𝔪` were in `𝔪²`, then `𝔪 = 𝔪²`, and Nakayama gives `𝔪 = ⊥`, contradicting positive dimension. ## New file * `Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean` ## Acknowledgements Thanks to Dora Kassabova and Leopold Mayer for edit suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory	57/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean	2	10	['NoahW314', 'github-actions', 'hommmmm', 'tb65536', 'wwylele']	chrisflav assignee:chrisflav	14-69843 14 days ago	19-767 19 days ago	19-62932 19 days
36789	hommmmm author:hommmmm	feat(RingTheory/Ideal/Height): prime ideal determined by height among overideals	## Summary - Add `Ideal.eq_of_le_of_height_eq`: a prime ideal of finite height is equal to any ideal of the same height that contains it. ## Notes This is a direct consequence of `Ideal.height_strict_mono_of_is_prime`: if `I` were strictly contained in `J`, their heights would differ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	10/0	Mathlib/RingTheory/Ideal/Height.lean	1	7	['github-actions', 'hommmmm', 'tb65536']	erdOne assignee:erdOne	14-69842 14 days ago	19-61879 19 days ago	19-61869 19 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	14-38429 14 days ago	633-40602 633 days ago	0-6775 1 hour
34477	spanning-tree author:spanning-tree	refactor(Order): make CompletePartialOrder extend OrderBot	Make `CompletePartialOrder` extend `OrderBot`, and add a constructor `completePartialOrderOfLubOfDirected`. Previously, `CompletePartialOrder` had an implicit bottom element but did not extend OrderBot explicitly. Breaking change: `CompletePartialOrder` instances must provide `⊥` and `bot_le`, or use the constructor. See discussion in [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20complete.20partial.20order.20and.20domain.20theory.20formalization). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	15/1	Mathlib/Order/CompletePartialOrder.lean	1	3	['Citronhat', 'github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	13-69929 13 days ago	36-22828 36 days ago	56-84375 56 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	7	['SproutSeeds', 'github-actions', 'jsm28', 'ocfnash']	jsm28 assignee:jsm28	13-33850 13 days ago	13-33857 13 days ago	6-36700 6 days
37109	zeekmartin author:zeekmartin	feat(SimpleGraph): card of common neighbors equals card of triangles containing edge	Adds `SimpleGraph.card_commonNeighbors_eq_card_triangles_containing_edge` to `Mathlib/Combinatorics/SimpleGraph/Clique.lean`. For adjacent vertices `u v` in a finite simple graph, establishes the bijection between common neighbors and 3-cliques containing the edge `{u, v}`: ```lean theorem card_commonNeighbors_eq_card_triangles_containing_edge {u v : α} (huv : G.Adj u v) : (G.commonNeighbors u v).toFinset.card = ((G.cliqueFinset 3).filter fun s => {u, v} ⊆ s).card ``` This connects `commonNeighbors` (defined in `Basic.lean`) with `cliqueFinset` — a gap not previously covered in `Clique.lean`. AI disclosure: Claude (Anthropic) was used as an assistant during the development of this proof. It helped with the initial proof structure and tactic suggestions. The proof was reviewed and validated step by step by the author, who can vouch for all the content. The mathematical idea originates from the author's prior Lean 4 work on spectral graph theory (github.com/zeekmartin/topostability-lean4). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics LLM-generated new-contributor	61/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	7	['SnirBroshi', 'github-actions', 'zeekmartin']	nobody	13-8950 13 days ago	13-16109 13 days ago	13-16099 13 days
37121	Smithl-Lin author:Smithl-Lin	feat(Probability/Martingale): Ville's supermartingale inequality	## Ville's supermartingale inequality This PR formalizes Ville's inequality for nonnegative supermartingales, providing time-uniform probability bounds. ### Main results - `Supermartingale.integral_le`: for a supermartingale, `E[f_j] ≤ E[f_i]` when `i ≤ j` - `Supermartingale.measureReal_le_div`: basic Ville inequality, `μ{ω \| λ ≤ f n ω} ≤ E[f 0] / λ` - `Supermartingale.measureReal_le_div_forall`: quantified over all `n` - `Supermartingale.measureReal_sup_le_div`: supremum version, `μ{ω \| ∃ n, λ ≤ f n ω} ≤ E[f 0] / λ` (proof via optional stopping, sorry pending) - `Supermartingale.integral_stoppedValue_le`: `E[f_τ] ≤ E[f 0]` for bounded stopping times (sorry pending) ### Addresses #36641 This PR includes the supremum statement using `IsStoppingTime` and `stoppedValue` as requested by @RemyDegenne on #36641. The two remaining `sorry`s follow the documented stopping time argument and will be filled in a follow-up. ### Motivation Ville's inequality is the foundation of anytime-valid inference, e-values, and safe sequential testing (Shafer 2021, Ramdas et al. 2023). The supremum version provides time-uniform control strictly stronger than pointwise Markov. ### References - Ville, J. (1939). Étude critique de la notion de collectif. - Howard, Ramdas, McAuliffe, Sekhon (2021). Time-uniform, nonparametric, nonasymptotic confidence sequences. Ann. Statist.	t-measure-probability LLM-generated new-contributor	157/0	Mathlib.lean,Mathlib/Probability/Martingale/Ville.lean	2	3	['github-actions', 'mathlib-bors']	nobody	12-71476 12 days ago	13-769 13 days ago	0-482 8 minutes
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']	awainverse assignee:awainverse	12-44445 12 days ago	22-54145 22 days ago	22-54135 22 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	12-43182 12 days ago	21-42536 21 days ago	0-322 5 minutes
32744	NoneMore author:NoneMore	feat(ModelTheory/Definablity): add `DefinableFun` definition and lemmas	This PR adds two basic shapes of definable sets and `DefinableFun` definition with relevant lemmas. The main result is `Set.Definable.preimage_of_map` asserting that the preimage of a definable set under a definable map is definable. There are also some tool lemmas derived by the preimage lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	147/0	Mathlib/ModelTheory/Definability.lean	1	60	['NoneMore', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	12-42320 12 days ago	12-42301 12 days ago	108-525 108 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	25	['FrankieeW', 'eric-wieser', 'github-actions', 'riccardobrasca', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	12-34613 12 days ago	21-19903 21 days ago	7-10039 7 days
36850	whocares-abt author:whocares-abt	feat(Combinatorics/SimpleGraph/Acyclic): add delete leaf from tree gives tree	Added theorem stating Deleting a leaf from a tree produces a tree.	t-combinatorics new-contributor	5/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['github-actions', 'vlad902']	nobody	12-22091 12 days ago	16-47079 16 days ago	18-29925 18 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	12-17651 12 days ago	12-17652 12 days ago	27-18698 27 days
37161	mike1729 author:mike1729	feat(Analysis/Normed/Module): add bornology and T2 instances for WeakSpace	Register the norm bornology on `WeakSpace 𝕜 E` and prove that it coincides with the von Neumann bornology of the weak topology. ### New declarations * `WeakSpace.instBornology`: norm bornology inherited from `E`. * `WeakSpace.instT2Space`: Hausdorff via Hahn–Banach separation. * `WeakSpace.norm_topology_le_weakSpace_topology`: the weak topology is coarser than the norm topology. * `WeakSpace.isBounded_iff_isVonNBounded`: norm-boundedness equals weak von Neumann boundedness (no `[CompleteSpace E]` needed). --- - [ ] depends on: #37027 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor	322/113	Mathlib.lean,Mathlib/Analysis/LocallyConvex/WeakBilin.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/WeakSpace.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Algebra/Module/WeakSpace.lean	6	3	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	12-6793 12 days ago	12-28987 12 days ago	0-50 50 seconds
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	12-6320 12 days ago	144-25255 144 days ago	0-1762 29 minutes
35600	yisiox author:yisiox	feat(Computability): add Kleene's algorithm to prove regular languages have regex matching	This PR adds a proof that every regular language has some regular expression matching it. This was achieved by the following constructions and proofs of their correctness - Define `toSingleεNFA` to transform any epsilon-NFA to an equivalent one with only a single start and accept state (and the type is `ExtendedState`) - Define a bijection between `ExtendedState` and `Fin (FinEnum.card (ExtendedState σ))` to index the states - Define `pathRegex` which implements Kleene's algorithm - Define `toRegex` which takes an epsilon-NFA, applies `toSingleεNFA` on it, and computes the corresponding regex using `pathRegex` The proofs of correctness chain together to yield `(toRegex M).matches' = M.accepts` which asserts the direction of Kleene's theorem required. --- As in [#mathlib4 > Regular languages: the review queue @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/near/573958148), this overlaps with #15654, which uses GNFA instead but has been inactive. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	492/0	Mathlib/Computability/EpsilonNFA.lean	1	15	['YaelDillies', 'github-actions', 'yisiox']	YaelDillies assignee:YaelDillies	11-45951 11 days ago	13-27115 13 days ago	32-29288 32 days
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 submersions.	t-differential-geometry new-contributor	599/0	Mathlib.lean,Mathlib/Geometry/Manifold/Submersion.lean	2	4	['github-actions', 'grunweg']	PatrickMassot assignee:PatrickMassot	11-38525 11 days ago	11-38474 11 days ago	42-70801 42 days
33520	NoneMore author:NoneMore	feat(ModelTheory/ElementarySubstructures): add a variant of Tarski-Vaught test taking sets as input	There should exist an `ElementarySubstructure.copy` such that we can directly bundle the set itself instaed of its closure as an elementary substructure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic new-contributor	91/0	Mathlib/ModelTheory/ElementarySubstructures.lean	1	3	['Citronhat', 'NoneMore', 'github-actions']	fpvandoorn assignee:fpvandoorn	11-38504 11 days ago	11-38568 11 days ago	93-30573 93 days
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 does not depend `Q(PartialOrder $α)`, and the constructors of `Strictness` now have their order typeclass arguments. In order to help `Qq` synth instances property, we have to move `assertInstancesCommute` to inner branch, manually add `haveI'` or explicitly pass the order typeclass instance into `.positive`/`.nonnegative`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	611/322	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/Module/Field.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/Complex/Order.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/DerivHyp.lean,Mathlib/Combinatorics/Enumerative/DyckWord.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/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean,Mathlib/NumberTheory/ArithmeticFunction/Zeta.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean	37	23	['HugLycan', 'JovanGerb', 'fpvandoorn', 'github-actions', 'joneugster']	JovanGerb assignee:JovanGerb	11-36558 11 days ago	18-40295 18 days ago	18-43403 18 days
36955	NoneMore author:NoneMore	chore(ModelTheory/Types): expose `T` in `typesWith` and move it to `Theory`	Make the `T : L.Theory` argument explicit in `typesWith` and place the definition in `FirstOrder.Language.Theory` to enable dot notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic new-contributor	24/19	Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean	2	2	['github-actions']	nobody	11-25734 11 days ago	16-16099 16 days ago	16-16089 16 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	11-7098 11 days ago	11-7098 11 days ago	52-18954 52 days
36216	michaellee94 author:michaellee94	feat(CategoryTheory): characterize pullback squares via the `Over` category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor maintainer-merge awaiting-author	47/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/IsPullback/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'michaellee94']	robin-carlier assignee:robin-carlier	10-84576 10 days ago	10-84576 10 days ago	2-50782 2 days
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	305/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	72	['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'grunweg', 'homeowmorphism', 'kbuzzard', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	nobody	10-60048 10 days ago	17-81534 17 days ago	0-4650 1 hour
36508	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): add FreeGroup instance	Add free group instances of finitely presented group and a helpful quotient `def` that says that quotienting a group by the normal closure of the empty set gives back the group. Use of AI: this was written by hand then golfed using GPT-5.4. --- - [ ] depends on: #34236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	293/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	12	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59919 10 days ago	25-67940 25 days ago	0-1907 31 minutes
36872	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): add trivial instance	--- - [ ] depends on: #34236 - [ ] depends on: #36508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	295/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	11	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59909 10 days ago	17-83254 17 days ago	0-460 7 minutes
36873	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): Add multiplicative ℤ instance	--- - [ ] depends on: #34236 - [ ] depends on: #36508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	298/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	11	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59908 10 days ago	17-81701 17 days ago	0-1537 25 minutes
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	7	['Blackfeather007', 'chrisflav', 'erdOne', 'github-actions', 'urkud']	erdOne assignee:erdOne	10-41449 10 days ago	99-84104 99 days ago	4-57005 4 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	10-31819 10 days ago	10-31869 10 days ago	27-59706 27 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	10-31812 10 days ago	17-13524 17 days ago	9-58085 9 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	292/2	Mathlib/Combinatorics/SimpleGraph/Matching.lean	1	39	['JTylM', 'SnirBroshi', 'SproutSeeds', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	10-20830 10 days ago	18-22354 18 days ago	8-62228 8 days
35473	mike1729 author:mike1729	feat(Analysis/Normed/Module): Schauder bases, basic sequences, and the Eberlein–Šmulian theorem	This PR develops the theory of Schauder bases and basic sequences in Banach spaces, culminating in a proof of the Eberlein–Šmulian theorem: in a Banach space, a weakly countably compact set is weakly compact (and weakly sequentially compact). Note: This PR is too large to review in one go. It will be split into smaller parts and merged incrementally. The first part is already under review: The proof follows the basic-sequence approach of Pełczyński, as presented in Albiac–Kalton Topics in Banach Space Theory (2016). The main line of argument is: 1. Define generalized Schauder bases (indexed by arbitrary types with a summation filter) and the classical sequential Schauder basis as a special case. 2. Introduce basic sequences and their characterization via the Grünblum condition. 3. Prove the selection principle: extract basic sequences from sets where the weak and norm closures disagree (via a perturbation/finite-dimensional compactness argument in the dual). 4. Show that a bounded set containing no basic sequence has relatively weakly compact closure. 5. Combine these ingredients to prove both directions of the Eberlein–Šmulian theorem. ## Main definitions * `GeneralSchauderBasis β 𝕜 X L`: A Schauder basis for a normed space `X` over `𝕜`, indexed by a type `β` with a `SummationFilter L`. Unifies classical (sequential) and unconditional bases. * `BasicSequence 𝕜 X`: A bundled ℕ-indexed sequence forming a Schauder basis for its closed linear span. ## Main results * `isBasicSequence_of_Grunblum_with_bound`: A nonzero sequence satisfying the Grünblum condition is a basic sequence, with explicit basis constant bound. * `basic_sequence_selection_dual`: Extracts a basic sequence from a set that is weak-dense near 0 but norm-separated from 0. `exists_basicSequence_of_weakClosure_not_normClosure`: If 0 is in the weak closure of `S` but not its norm closure, then `S` contains a basic sequence. * `schauderBasisOfClosure`: Constructs a Schauder basis for the topological closure from a basis on a subspace. * `no_basic_sequence_implies_relatively_weakly_compact`: A bounded set with no basic sequence has weakly compact closure. * `eberlein_smulian_isSeqCompact`: A weakly countably compact set in a Banach space is weakly sequentially compact. * `eberlein_smulian`: Eberlein–Šmulian theorem. A weakly countably compact set in a Banach space is weakly compact. * `IsCompact.frechetUrysohnSpace`: Weakly compact subsets of a Banach space are Fréchet–Urysohn (angelic). ## References * [F. Albiac, N.J. Kalton, Topics in Banach Space Theory, Springer, 2016][albiac2016] * I. Singer, Bases in Banach Spaces, 1970. --- - [x] depends on: #34209 - [x] depends on: #35559 - [x] depends on: #36174 - [ ] depends on: #36849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor blocked-by-other-PR	2691/0	Mathlib.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/Basic.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/BasicSequence.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/BasicSequenceSelection.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/Closure.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/CountablyCompact.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/EberleinSmulian.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/NoBasicSequence.lean	8	6	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mike1729']	nobody	10-4025 10 days ago	unknown	0-0 0 seconds
34481	DAE123456 author:DAE123456	feat: Ore's Theorem	Ore Theorem : Let G be a graph of order n ≥ 3 that satisfies the Ore property. Then G has a Hamilton cycle.	t-combinatorics new-contributor awaiting-author	3372/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Ore.lean	2	31	['DAE123456', 'LLaurance', 'Ruben-VandeVelde', 'SnirBroshi', 'YaelDillies', 'github-actions', 'kim-em', 'tb65536', 'vlad902']	YaelDillies and kmill assignee:kmill assignee:YaelDillies	10-892 10 days ago	10-50478 10 days ago	56-39391 56 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/) - [ ] depends on: #36386	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	4044/0	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,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,docs/references.bib	14	16	['Hagb', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-65533 9 days ago	28-60523 28 days ago	3-55474 3 days
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	237/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Braided/Traced.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Traced.lean,docs/references.bib	4	4	['dagurtomas', 'github-actions', 'matthunz']	nobody	9-59636 9 days ago	18-862 18 days ago	0-25956 7 hours
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.	t-topology new-contributor LLM-generated	269/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	3	8	['Vilin97', 'copilot-pull-request-reviewer', 'dagurtomas', 'github-actions', 'wwylele']	PatrickMassot assignee:PatrickMassot	9-14409 9 days ago	10-15275 10 days ago	18-45346 18 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 `R`-modules `M` and `N` and a set `s` in `M`, `Submodule.dual p s` is the submodule in `N` consisting of all points `y` such that `0 = p x y` for all `x ∈ s`. 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	5	['github-actions', 'joelriou', 'martinwintermath']	joelriou assignee:joelriou	9-3456 9 days ago	66-3069 66 days ago	14-81375 14 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	8-59748 8 days ago	11-52438 11 days ago	74-58112 74 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	51/25	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	3	1	['github-actions']	nobody	8-24813 8 days ago	unknown	0-0 0 seconds
35976	Phelixh author:Phelixh	feat: add add Liu's uncertainty theory foundations (core/distribution/process modules)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	2374/0	Mathlib.lean,Mathlib/Uncertainty/Base.lean,Mathlib/Uncertainty/BaseCore.lean,Mathlib/Uncertainty/BaseDistribution.lean,Mathlib/Uncertainty/BaseProcess.lean,Mathlib/Uncertainty/Uncertainty.lean	6	26	['Phelixh', 'copilot-pull-request-reviewer', 'github-actions']	nobody	8-22351 8 days ago	8-22418 8 days ago	8-27705 8 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	221/232	Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean	2	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-17248 8 days ago	8-17272 8 days ago	9-49478 9 days
36907	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): Make reversal closure an iff	--- Makes the reversal closure of CFGs a simp iff theorem, matching the way it is [handled in NFAs](https://github.com/leanprover-community/mathlib4/blob/1f3cdaa7a7f82a2e521d285b11e261110e1e1962/Mathlib/Computability/NFA.lean#L424-L425) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability awaiting-author	14/2	Mathlib/Computability/ContextFreeGrammar.lean	1	14	['github-actions', 'leanprover-radar', 'nielstron', 'plp127']	nobody	8-176 8 days ago	9-12327 9 days ago	1-25411 1 day
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']	jsm28 assignee:jsm28	7-86219 7 days ago	40-9382 40 days ago	42-43658 42 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	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	59	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'wwylele']	nobody	7-75748 7 days ago	9-78716 9 days ago	14-69931 14 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	33/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean	1	5	['github-actions', 'grunweg', 'themathqueen']	nobody	7-42188 7 days ago	10-11406 10 days ago	0-432 7 minutes
37071	ericluap author:ericluap	feat: Dedekind completion of rationals is isomorphic to EReal		t-order new-contributor awaiting-author	96/0	Mathlib.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/DedekindCut.lean	3	36	['ericluap', 'github-actions', 'vihdzp', 'wwylele']	vihdzp assignee:vihdzp	7-7191 7 days ago	7-7191 7 days ago	5-74712 5 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	['leanprover-community-mathlib4-bot', 'urkud']	nobody	84-58277 2 months ago	669-32345 669 days ago	9-15083 9 days
37059	thorimur author:thorimur	review: #36709	This review suggests - various improvements to the code structure + readability; pruning of unnecessary code - using `withCurrHeartbeats` instead of setting max heartbeats to 0 (and nothing at all in the `elabCommand` case, which should effectively start heartbeats afresh anyway) - not re-throwing `.internal` errors (does not touch unmodified sections of code that do the same) - hovers on names in the logged message + message newline fixes - another test, this time at the command level - `Name.lt` instead of `.quickLt` for human-readable sorting --- Targeting: https://github.com/leanprover-community/mathlib4/pull/36709 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	77/66	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	3	['SnirBroshi', 'github-actions', 'thorimur']	kim-em assignee:kim-em	10-24335 10 days ago	13-84073 13 days ago	13-84740 13 days
36582	kim-em author:kim-em	feat: run inferInstanceAs% normalization when deriving	This PR intercepts `def ... deriving ...` and `deriving instance ... for ...` commands that use the delta deriving handler, and runs the `normalizeInstance` machinery from `inferInstanceAs%` on the synthesized instances. This fixes carrier type leakage at `reducibleAndInstances` transparency for all delta-derived instances across Mathlib. The implementation copies `mkInst` and `processDefDeriving` from `Lean.Elab.Deriving.Basic` (Lean 4.29.0-rc6) and adds the normalization step. This is intentionally a temporary copy: once we settle on the right behavior, it will be upstreamed into Lean 4. - [ ] depends on: #35950 🤖 Prepared with Claude Code	large-import LLM-generated	353/3	Mathlib/Init.lean,Mathlib/Tactic/DerivingInferInstanceAs.lean,Mathlib/Tactic/InferInstanceAsPercent.lean,MathlibTest/DerivingInferInstanceAs.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-51316 4 days ago	24-58422 24 days ago	0-218 3 minutes

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	614-43893 1 year ago	688-3880 688 days ago	5-74504 5 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	1	614-43890 1 year ago	854-9253 854 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	614-43890 1 year ago	821-1981 821 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	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	1	614-43889 1 year ago	889-9386 889 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	614-43888 1 year ago	858-83030 858 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	595-21190 1 year ago	630-27412 630 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	595-10243 1 year ago	604-56405 604 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	520-37047 1 year ago	598-11028 598 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	507-43095 1 year ago	658-38731 658 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	441-39562 1 year ago	441-39562 441 days ago	69-24210 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	431-21582 1 year ago	1078-53121 1078 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	361-37944 11 months ago	494-26361 494 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	334-80949 10 months ago	412-19572 412 days ago	43-81252 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	332-12623 10 months ago	332-12623 332 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	235-75411 7 months ago	235-75411 235 days ago	71-28496 71 days
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	1	226-75333 7 months ago	226-75334 226 days ago	13-49738 13 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	209-74014 6 months ago	210-18717 210 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	201-37953 6 months ago	227-38738 227 days ago	17-62721 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	192-21467 6 months ago	273-21404 273 days ago	73-13048 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	188-65194 6 months ago	188-65194 188 days ago	48-73998 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	172-55954 5 months ago	172-55954 172 days ago	6-6533 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	172-51030 5 months ago	223-82827 223 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	160-41512 5 months ago	224-1685 224 days ago	2-31233 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	157-24768 5 months ago	236-40303 236 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	138-46606 4 months ago	776-25055 776 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	138-46475 4 months ago	600-80981 600 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	138-46041 4 months ago	407-65800 407 days ago	27-38491 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	138-46031 4 months ago	363-60273 363 days ago	50-13773 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	138-45899 4 months ago	385-39912 385 days ago	20-81771 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	138-45873 4 months ago	312-59144 312 days ago	71-48538 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	138-45189 4 months ago	138-45190 138 days ago	133-24576 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	138-45172 4 months ago	139-76963 139 days ago	84-39534 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	138-44877 4 months ago	143-8760 143 days ago	93-44257 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	138-44731 4 months ago	138-44732 138 days ago	71-37436 71 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	138-17911 4 months ago	613-38193 613 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	138-17323 4 months ago	230-14344 230 days ago	7-9588 7 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	130-33131 4 months ago	281-73009 281 days ago	58-34020 58 days
31597	grunweg author:grunweg	chore(AtLocation): allow throwing a warning when no progress is being made	A future PR will use this to make `by_contra!` and friends warn if the `push_neg` step makes no progress. Co-authored by: Jovan Gerbscheid --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta merge-conflict	46/28	Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/ReduceModChar.lean,Mathlib/Tactic/Ring/RingNF.lean,Mathlib/Util/AtLocation.lean,MathlibTest/FieldSimp.lean,MathlibTest/abel.lean	10	7	['JovanGerb', 'fpvandoorn', 'github-actions', 'mathlib4-merge-conflict-bot', 'thorimur']	thorimur assignee:thorimur	2	122-15261 4 months ago	136-12766 136 days ago	7-68323 7 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	121-66260 4 months ago	198-81968 198 days ago	44-10271 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	111-76896 3 months ago	133-26445 133 days ago	60-67125 60 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` --- - [ ] depends on: #21031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author blocked-by-other-PR merge-conflict 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', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	1	100-22869 3 months ago	109-83816 109 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	96-53302 3 months ago	98-21782 98 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	91-1476 3 months ago	538-48713 538 days ago	9-73631 9 days
32165	yuanyi-350 author:yuanyi-350	feat(Real/Trigonometric): Add `sum_cos_arith_progression` and prepare for Dirichlet kernel	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict	68/0	Mathlib.lean,Mathlib/Analysis/Fourier/DirichletKernel.lean	2	8	['BoltonBailey', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud', 'yuanyi-350']	fpvandoorn assignee:fpvandoorn	1	89-76169 2 months ago	126-62951 126 days ago	3-74302 3 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	85-76769 2 months ago	212-18748 212 days ago	82-7527 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	84-58184 2 months ago	689-27609 689 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	28	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	1	84-4550 2 months ago	84-4771 84 days ago	22-22665 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	82-10193 2 months ago	138-44129 138 days ago	20-33900 20 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 label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	8	['Garmelon', 'Vierkantor', 'artie2000', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	2	74-16905 2 months ago	74-16905 74 days ago	40-42357 40 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	57-68584 1 month ago	57-68584 57 days ago	35-16104 35 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	50-22137 1 month ago	699-21337 699 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	50-14057 1 month ago	52-6513 52 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	47-74968 1 month ago	139-40737 139 days ago	24-84527 24 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	41-80938 1 month ago	117-81808 117 days ago	2-78371 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	41-17715 1 month ago	41-63251 41 days ago	5-41003 5 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	38-68404 1 month ago	40-76893 40 days ago	11-35673 11 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	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']	joneugster assignee:joneugster	1	37-21246 1 month ago	47-41311 47 days ago	13-82065 13 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 awaiting-author	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	57	['JovanGerb', 'Vierkantor', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	1	33-21904 1 month ago	33-21904 33 days ago	112-29409 112 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	32-2857 1 month ago	154-3718 154 days ago	23-31743 23 days
34245	staroperator author:staroperator	feat(Data/Set): add `Set.Uncountable`	There are `Set` specialized shortcuts `Set.Finite`, `Set.Infinite` and `Set.Countable`, but lacking `Set.Uncountable`. I find this useful in #34246. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	82/4	Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Data/Set/Countable.lean,Mathlib/SetTheory/Cardinal/Basic.lean	3	17	['github-actions', 'joneugster', 'staroperator', 'vihdzp']	joneugster assignee:joneugster	1	31-37506 1 month ago	62-10753 62 days ago	12-21154 12 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	31-29249 1 month ago	291-28988 291 days ago	91-69159 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	31-29232 1 month ago	502-69867 502 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	31-18248 1 month ago	80-46775 80 days ago	10-68503 10 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	23-13952 23 days ago	138-45027 138 days ago	114-38193 114 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	23-13886 23 days ago	67-2127 67 days ago	59-63981 59 days
36443	Fieldnote-Echo author:Fieldnote-Echo	feat(Combinatorics/SimpleGraph): add SimpleGraph.ball (open metric ball)	Add `SimpleGraph.ball`, the open ball in the graph extended metric. ## Design decisions - Open ball (strict `<`, not `≤`): `ball c ⊤` coincides with the connected component of `c`, whereas a closed ball would give `closedBall c ⊤ = univ`. - Named `SimpleGraph.ball` (not `eball`): since `dist`-valued balls are less natural for disconnected graphs, the `e` prefix is unnecessary. - Graph-specific (not via `PseudoEMetricSpace`): avoids importing `ℝ`. AI assistance: Claude (Opus 4.6) helped draft and iterate on the implementation. I reviewed the code line by line and vouch for the final contents. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/SimpleGraph.20metric.20balls/with/577846803). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	59/3	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	36	['Fieldnote-Echo', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'lauramonk', 'vlad902']	nobody	1	21-19032 21 days ago	27-17544 27 days ago	27-17534 27 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 merge-conflict LLM-generated	51/3	Mathlib/CategoryTheory/Galois/EssSurj.lean,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']	joneugster assignee:joneugster	1	21-18852 21 days ago	48-62720 48 days ago	37-27992 37 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	19-77044 19 days ago	46-38206 46 days ago	0-187 3 minutes
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	19-12179 19 days ago	228-18627 228 days ago	64-11252 64 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 --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	110/1	Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	5	18	['Rida-Hamadani', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	1	18-70444 18 days ago	18-70444 18 days ago	13-56327 13 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	96/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	4	56	['chrisflav', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'sgouezel']	PatrickMassot assignee:PatrickMassot	1	18-17297 18 days ago	81-9963 81 days ago	0-1863 31 minutes
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	17-12924 17 days ago	17-12925 17 days ago	24-18556 24 days
35622	SnirBroshi author:SnirBroshi	feat(Logic/Function/Basic): `onFun` and `swap` preserve relation properties	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	141/19	Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WellFounded.lean,Mathlib/Order/WithBot.lean	8	7	['SnirBroshi', 'github-actions', 'leanprover-radar', 'vihdzp']	awainverse assignee:awainverse	1	16-69935 16 days ago	31-60352 31 days ago	43-44193 43 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	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	16-53865 16 days ago	54-32489 54 days ago	33-85043 33 days
34805	DavidLedvinka author:DavidLedvinka	feat(Tactic): generalize ofScientific NormNum extension to `DivisionSemiring`	Co-authored-by: @hrmacbeth	t-meta	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']	JovanGerb assignee:JovanGerb	1	16-474 16 days ago	16-475 16 days ago	36-41877 36 days
34315	LessnessRandomness author:LessnessRandomness	feat(Combinatorics/SimpleGraph/Bipartite): Prove upper bound of edge set cardinality of bipartite graph	Two ways to express upper bound of the edge set of bipartite graph: 1) If the cardinalities of both parts/sets, that make bipartite graph, are known, then the upper bound is equal to product of the cardinalities of both parts; 2) Four times of the cardinality of the edge set is less or equal to squared cardinality of vertex set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	54/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	56	['LessnessRandomness', 'SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	awainverse assignee:awainverse	1	15-85911 15 days ago	15-85981 15 days ago	67-77921 67 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 merge-conflict	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	139	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	15-69882 15 days ago	25-39195 25 days ago	35-56704 35 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	77/10	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	25	['Komyyy', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	1	14-69870 14 days ago	67-5437 67 days ago	78-50842 78 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	t-algebra new-contributor label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	11	['Xxxjdjdid', 'banrovegrie', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	1	14-69859 14 days ago	60-18226 60 days ago	60-18216 60 days
35627	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Finite): min/max degrees of top/bot	And a couple of lemmas about `IsRegularOfDegree`, e.g. the empty graph is regular of any degree. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	30/1	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	2	15	['SnirBroshi', 'YaelDillies', 'github-actions', 'vlad902']	kmill assignee:kmill	2	14-45679 14 days ago	15-66101 15 days ago	41-14394 41 days
36585	vihdzp author:vihdzp	feat: order type of `Iio o` is `lift o`	Downstreamed from the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	19/17	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean	5	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	alreadydone assignee:alreadydone	1	13-79442 13 days ago	13-79502 13 days ago	23-25198 23 days
36693	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): * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 * `Filter.hasBasis_biInf_of_directed'`: 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/)		2/15	Mathlib/GroupTheory/Perm/Support.lean,Mathlib/Order/Filter/Bases/Basic.lean	2	1	['artie2000', 'github-actions']	nobody	1	13-73092 13 days ago	22-807 22 days ago	22-797 22 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	1	['artie2000', 'github-actions']	nobody	1	13-72360 13 days ago	20-11770 20 days ago	20-11760 20 days
36840	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Arithmetic): a few ordinal division lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	27/8	Mathlib/SetTheory/Ordinal/Arithmetic.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	alreadydone assignee:alreadydone	1	13-69915 13 days ago	18-67461 18 days ago	18-67451 18 days
36958	JovanGerb author:JovanGerb	chore(Topology/Order/Basic): use `Preorder.topology` in `OrderTopology`	This PR addresses the comment: ``` TODO: define `Preorder.topology` before `OrderTopology` and reuse the def ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	22/19	Mathlib/Topology/Instances/Discrete.lean,Mathlib/Topology/Order/Basic.lean	2	1	['github-actions', 'vihdzp']	PatrickMassot assignee:PatrickMassot	1	13-42280 13 days ago	15-62059 15 days ago	15-62384 15 days
35084	edegeltje author:edegeltje	feat(Combinatorics/SimpleGraph): Cayley graph for structures with `Mul`/`Add`	This pr: - adds the definition `SimpleGraph.mulCayley`, where `x` is adjacent to a distinct `y` when there is `g` such that `x * g = y` or `x = y * g`, - proves various lemmas about the above, - adds/proves the additive versions of all of the above some related zulip conversation: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Cayley.20and.20circulant.20graph/with/572839048 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	141/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cayley.lean	2	44	['SnirBroshi', 'YaelDillies', 'edegeltje', 'github-actions', 'vihdzp', 'vlad902']	kmill assignee:kmill	1	13-22456 13 days ago	16-14476 16 days ago	53-334 53 days
32744	NoneMore author:NoneMore	feat(ModelTheory/Definablity): add `DefinableFun` definition and lemmas	This PR adds two basic shapes of definable sets and `DefinableFun` definition with relevant lemmas. The main result is `Set.Definable.preimage_of_map` asserting that the preimage of a definable set under a definable map is definable. There are also some tool lemmas derived by the preimage lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	147/0	Mathlib/ModelTheory/Definability.lean	1	60	['NoneMore', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	1	12-42320 12 days ago	12-42301 12 days ago	108-525 108 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	16	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	b-mehta assignee:b-mehta	1	12-39672 12 days ago	12-39696 12 days ago	31-33506 31 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 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	10	['Rob23oba', 'eric-wieser', 'github-actions', 'joelriou', 'joneugster', 'loefflerd']	joelriou assignee:joelriou	1	12-29862 12 days ago	12-50360 12 days ago	36-23157 36 days
36794	vihdzp author:vihdzp	doc(SetTheory/Ordinal/Principal): improve documentation	The module docstring now contains a description of what an `op`-principal actually is. I've also added some additional names for discoverability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory documentation	26/20	Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	2	8	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	alreadydone assignee:alreadydone	1	11-69802 11 days ago	16-70276 16 days ago	19-3069 19 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	11-9048 11 days ago	17-12915 17 days ago	15-54679 15 days
30666	erdOne author:erdOne	feat(NumberTheory): every number field has a ramified prime	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra awaiting-CI label:t-algebra$	261/10	Mathlib.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/KrullDimension/Basic.lean	12	33	['erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536', 'xroblot']	jcommelin assignee:jcommelin	1	11-1808 11 days ago	148-22106 148 days ago	13-79962 13 days
36891	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Exponential): characterization of `a ^ b = 1`	Used in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	12/0	Mathlib/SetTheory/Ordinal/Exponential.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	alreadydone assignee:alreadydone	1	10-69778 10 days ago	12-75714 12 days ago	17-44512 17 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'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author merge-conflict	161/136	Mathlib.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.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/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/Quot.lean,Mathlib/FieldTheory/PerfectClosure.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	25	19	['SnirBroshi', 'Vierkantor', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'thorimur', 'vihdzp']	Vierkantor assignee:Vierkantor	1	10-63597 10 days ago	11-7572 11 days ago	61-68818 61 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	10-37049 10 days ago	259-84675 259 days ago	88-84229 88 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	1	10-36498 10 days ago	325-15203 325 days ago	43-17409 43 days
36401	JovanGerb author:JovanGerb	feat(positivity): positivity extension for `a - b`	This PR adds support in `positivity` for proving things about subtraction. For example, if the goal is `0 < a - b`, and there is a local hypothesis of type `b < a`, then we close the goal. The motivation is that we want `positivity` to be a flexible tactic. So, when trying to prove `0 < a - b` using a local hypothesis, we should look for the simp normal form of this, which is `b < a`. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Can.20I.20make.20positivity.20work.20for.20this.3F/near/578277240) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-zulip	63/26	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/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Tactic/Positivity/Basic.lean,MathlibTest/positivity.lean	10	8	['JovanGerb', 'github-actions', 'hrmacbeth', 'j-loreaux', 'joneugster', 'leanprover-radar']	joneugster assignee:joneugster	1	10-7933 10 days ago	10-21741 10 days ago	17-57303 17 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	9-84960 9 days ago	21-62665 21 days ago	0-1003 16 minutes
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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions']	nobody	1	9-71887 9 days ago	11-63104 11 days ago	12-36738 12 days
35613	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Clique): use `IsContained` instead of an explicit embedding from top	This makes theorems require only a proof that a `Copy` exists rather than provide an explicit `Embedding`. Also tag monotonicity lemmas with `@[gcongr]`, and add `Copy.isContained` / `Embedding.isIndContained` / `Embedding.isContained` / `Iso.isContained'`. --- This isn't a generalization per-se since one could use choice plus `Copy.topEmbedding` to upgrade the `IsContained` to an embedding, but `IsContained` makes more sense in theorems. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	65/55	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	4	21	['SnirBroshi', 'YaelDillies', 'github-actions']	awainverse assignee:awainverse	1	8-32333 8 days ago	14-24712 14 days ago	38-6995 38 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']	JovanGerb assignee:JovanGerb	1	7-86349 7 days ago	10-7480 10 days ago	10-8206 10 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']	b-mehta assignee:b-mehta	1	7-85079 7 days ago	83-634 83 days ago	83-624 83 days
35830	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Nat/Choose/Multinomial): multinomial coefficients	Define the multinomial coefficients, a variant of `Nat.multinomial`. - redefine `Multiset.multinomial`. Given a multiset `m` of natural numbers, `m.multinomial` is the multinomial coefficient defined by (m.sum) ! / ∏ i ∈ m, m i !. As an example, `Multiset.multinomial {1, 2, 2} = 30`. This is the exponent of $x y^2 z^2$ in $(x+y+z)^5$. This should not be confused with the existing `Multiset.multinomial` which gives a different answer, for example, `Multiset.multinomial {1, 2, 2} = 3`. This function is renamed as `Multiset.countPerms`. - `Multiset.multinomial_cons` proves that `(x ::ₘ m).multinomial = Nat.choose (x + m.sum) x * m.multinomial` - `Multiset.multinomial_add` proves that `(m + m').multinomial = Nat.choose (m + m').sum m.sum * m.multinomial * m'.multinomial` co-authored with @mariainesdff --- - [x] depends on: #36611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data blocked-by-core-release	122/1	Mathlib/Data/List/ToFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean	2	25	['AntoineChambert-Loir', 'github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	joneugster assignee:joneugster	1	7-3196 7 days ago	7-34766 7 days ago	27-74956 27 days
37060	pfaffelh author:pfaffelh	feat: `Set.indicator` on a disjoint union equals the sum of individual `Set.indicator`	Prove a helper lemma on mulIndicators, needed in measure/probability theory: If `s : γ → Set β` is `Pairwise (Disjoint on s)` and `f : β → α`, then `(⋃ d, s d).mulIndicator f i = ∏' d, (s d).mulIndicator f i` for `i : β`. The `to_additive` tag is added for `Set.indicator`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	57/1	Mathlib/Algebra/Group/Indicator.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	2	30	['DavidLedvinka', 'github-actions', 'mathlib-bors', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	1	6-36340 6 days ago	6-36340 6 days ago	7-13173 7 days
37317	vihdzp author:vihdzp	feat: a topology with a basis of clopens is completely regular	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	11/0	Mathlib/Topology/Separation/CompletelyRegular.lean	1	4	['felixpernegger', 'github-actions', 'themathqueen', 'vihdzp']	urkud assignee:urkud	2	6-24544 6 days ago	9-18006 9 days ago	9-17996 9 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	10	['Multramate', 'github-actions', 'smmercuri']	mattrobball assignee:mattrobball	1	6-16706 6 days ago	6-16762 6 days ago	39-6693 39 days
36788	hommmmm author:hommmmm	feat(RingTheory): height of span of a prime element is one	## Summary - Add `Ideal.height_span_singleton_eq_one_of_prime`: in a Noetherian integral domain, the ideal generated by a prime element has height one. ## Notes The new theorem follows directly from `height_le_one_of_isPrincipal_of_mem_minimalPrimes` (upper bound) and the fact that `span {p} ≠ ⊥` for `p` prime (lower bound). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	12/1	Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean	1	5	['Multramate', 'github-actions', 'hommmmm']	mattrobball assignee:mattrobball	1	5-80313 5 days ago	5-81333 5 days ago	19-62158 19 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	96/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	51	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1	5-77212 5 days ago	5-77213 5 days ago	17-606 17 days
36968	NoahW314 author:NoahW314	feat: add missing IndiscreteTopology instances	Add several instances for the IndiscreteTopology. These instances are chosen as they have short proofs and imply many of the more common instances like `NormalSpace` and `LocPathConnectedSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	21/0	Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/Metrizable/Basic.lean	4	3	['felixpernegger', 'github-actions']	PatrickMassot assignee:PatrickMassot	1	5-61816 5 days ago	5-61870 5 days ago	15-41997 15 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/)		6/38	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	1	['FernandoChu', 'github-actions']	nobody	1	5-42553 5 days ago	7-79855 7 days ago	7-79845 7 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/)		10/51	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	1	['artie2000', 'github-actions', 'ooovi']	nobody	2	5-40869 5 days ago	22-17731 22 days ago	22-17721 22 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	35/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'scholzhannah']	mcdoll assignee:mcdoll	1	5-16104 5 days ago	13-12903 13 days ago	13-14143 13 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 merge-conflict	14/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean	2	8	['Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	YaelDillies assignee:YaelDillies	1	5-10256 5 days ago	5-10257 5 days ago	34-33918 34 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 `Continous.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	57/33	Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,MathlibTest/fun_prop_dev.lean	5	6	['gasparattila', 'github-actions', 'grunweg', 'lecopivo', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	1	4-84849 4 days ago	9-81983 9 days ago	41-79534 41 days
36155	grunweg author:grunweg	feat: custom elaborators for TangentSpace and tangentMap(Within)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta	58/28	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	7	4	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash']	PatrickMassot assignee:PatrickMassot	1	4-69876 4 days ago	30-27524 30 days ago	31-37276 31 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} (N : Submodule R₁ M₁) (B : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M) : 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$	17/17	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	4	['eric-wieser', 'github-actions', 'martinwintermath', 'vihdzp']	ocfnash assignee:ocfnash	1	4-69862 4 days ago	5-29862 5 days ago	6-82191 6 days
34969	kim-em author:kim-em	feat(RingTheory/HopfAlgebra): prove antipode is antihomomorphism	This PR proves that the antipode of a Hopf algebra is an antihomomorphism: `antipode (a * b) = antipode b * antipode a`. The proof uses the convolution algebra structure on `(A ⊗ A) →ₗ[R] A` and shows that `S ∘ μ` and `μ ∘ (S ⊗ S) ∘ comm` are both convolution inverses of `μ`, hence they must be equal by uniqueness of inverses. This resolves a TODO listed in the file header. 🤖 Prepared with Claude Code	t-ring-theory LLM-generated delegated ready-to-merge	85/3	Mathlib/RingTheory/HopfAlgebra/Basic.lean	1	18	['YaelDillies', 'github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	4-49670 4 days ago	14-46231 14 days ago	42-13893 42 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	2	['YaelDillies', 'github-actions', 'ooovi', 'vihdzp']	nobody	3	4-40993 4 days ago	6-40612 6 days ago	6-40739 6 days
37515	chrisflav author:chrisflav	feat(Topology): a coinducing map with connected fibers induces a homeomorphism on connected components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	53/0	Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	3	11	['chrisflav', 'github-actions', 'grunweg', 'scholzhannah']	j-loreaux assignee:j-loreaux	1	4-40643 4 days ago	4-40805 4 days ago	5-1249 5 days
37514	chrisflav author:chrisflav	chore(Topology/Connected): generalize `preimage_connectedComponent_connected` to closed connected sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	33/24	Mathlib/Topology/Connected/Clopen.lean	1	3	['github-actions', 'scholzhannah']	j-loreaux assignee:j-loreaux	1	4-40554 4 days ago	4-40599 4 days ago	4-86259 4 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/)		7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	3	['artie2000', 'github-actions', 'mathlib-merge-conflicts']	nobody	1	4-29193 4 days ago	4-29217 4 days ago	20-1026 20 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` * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` * `PointedCone.neg_ofSubmodule` proving `-(ofSubmodule S) = S` In preparation for #36605. Co-authored by: Artie Khovanov --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	28/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	10	['artie2000', 'github-actions', 'martinwintermath', 'ooovi']	nobody	1	4-24788 4 days ago	4-24826 4 days ago	4-63303 4 days
35233	kim-em author:kim-em	chore: lake shake --add-public --keep-implied --keep-prefix --fix	This PR runs `lake shake --add-public --keep-implied --keep-prefix --fix` again after https://github.com/leanprover-community/mathlib4/pull/34511, picking up the remaining 28 files that now have suggestions. 🤖 Prepared with Claude Code	large-import awaiting-author LLM-generated merge-conflict	13/12	Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Data/Nat/Init.lean,Mathlib/LinearAlgebra/Matrix/Kronecker.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Map.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linter/FindDeprecations.lean,Mathlib/Tactic/Nontriviality/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Tauto.lean	16	17	['TwoFX', 'Vierkantor', 'adomani', 'bryangingechen', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts', 'mathlib-splicebot']	nobody	1	4-23186 4 days ago	33-31530 33 days ago	11-82916 11 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	53/0	Mathlib.lean,Mathlib/RingTheory/Localization/Saturation.lean	2	11	['alreadydone', 'chrisflav', 'github-actions', 'kckennylau', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	1	3-69775 3 days ago	32-16472 32 days ago	32-18348 32 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	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	5	['KryptosAI', 'Multramate', 'github-actions', 'ooovi']	nobody	1	3-66051 3 days ago	3-66109 3 days ago	17-76427 17 days
37505	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `SimpleGraph.length_cycleBypass_le`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	3/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	1	3-33238 3 days ago	5-17043 5 days ago	5-17033 5 days
35405	xroblot author:xroblot	feat(RamificationInertia): add `ramificationIdx_le_ramificationIdx` and `inertiaDeg_le_inertiaDeg`	Assume that `Q` is over `P` that is over `p`. We prove that: - `Ideal.ramificationIdx P Q ≤ Ideal.ramificationIdx p Q` - `Ideal.inertiaDeg P Q ≤ Ideal.inertiaDeg p Q` Note: These results also follow from [Ideal.ramificationIdx_algebra_tower](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/RamificationInertia/Basic.html#Ideal.ramificationIdx_algebra_tower) and [Ideal.inertiaDeg_algebra_tower](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/RamificationInertia/Basic.html#Ideal.inertiaDeg_algebra_tower) but they are proved here in a slightly more general situation. --- - [x] depends on: #35483 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	24/0	Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean	2	9	['Multramate', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'xroblot']	MichaelStollBayreuth and alexjbest assignee:alexjbest assignee:MichaelStollBayreuth	1	3-29676 3 days ago	3-29676 3 days ago	47-20255 47 days
37566	harahu author:harahu	doc(Order): 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/)	t-order	15/7	Mathlib/Order/Circular.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean	7	1	['Multramate', 'github-actions']	nobody	1	3-24528 3 days ago	4-5266 4 days ago	4-5256 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	131/116	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/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean	17	1	['Multramate', 'github-actions']	nobody	1	3-24255 3 days ago	10-74188 10 days ago	10-79875 10 days
37400	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): endpoints of a path have at most one neighbor in the path	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	1	3-18072 3 days ago	6-63753 6 days ago	6-63743 6 days
37434	mariainesdff author:mariainesdff	feat(Algebra/Group/Submonoid/Basic): add lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/0	Mathlib/Algebra/Group/Submonoid/Basic.lean	1	3	['FernandoChu', 'github-actions', 'j-loreaux', 'robin-carlier']	nobody	1	3-10454 3 days ago	3-10454 3 days ago	3-18550 3 days
37592	erdOne author:erdOne	feat: set up API for `ConvexSpace`	We introduce `sConvexCombo` and the indexed version `iConvexCombo` as the main API for `ConvexSpace` and prove lemmas around the new definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import maintainer-merge label:t-algebra$	452/133	Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/LinearAlgebra/ConvexSpace.lean,Mathlib/LinearAlgebra/ConvexSpace/AffineSpace.lean	3	15	['YaelDillies', 'erdOne', 'github-actions']	nobody	1	3-7974 3 days ago	3-23902 3 days ago	3-25159 3 days
35250	vlad902 author:vlad902	feat(SimpleGraph): redefine `cycleGraph` independent of `circulantGraph`	Right now the `cycleGraph` definition relies on `circulantGraph` which requires importing Group definitions from the algebra hierarchy. This causes large-imports for me in later PRs where I try to make more widespread use of cycleGraphs, so here I redefine it to be its own independent object, and leave moving it from `Circulant.lean` to another PR (this is parallel to #35084.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	10/10	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	5	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'vihdzp', 'vlad902']	nobody	3	2-85607 2 days ago	52-25831 52 days ago	52-25821 52 days
37471	NoahW314 author:NoahW314	feat(RingTheory/MvPolynomial/MonomialOrder): add `leadingTerm_mul` lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	7/0	Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	1	7	['Hagb', 'Maldooor', 'NoahW314', 'WilliamCoram', 'github-actions']	nobody	3	2-71938 2 days ago	5-58715 5 days ago	5-58705 5 days
37538	harahu author:harahu	doc(Probability): 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/)	t-measure-probability	7/4	Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/Kernel/Category/SFinKer.lean,Mathlib/Probability/Kernel/Category/Stoch.lean,Mathlib/Probability/Notation.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/Probability/StrongLaw.lean	6	1	['Multramate', 'github-actions']	kex-y assignee:kex-y	1	2-69893 2 days ago	4-29344 4 days ago	4-29334 4 days
36320	ZRTMRH author:ZRTMRH	feat(Combinatorics): add Schreier graph definition and covering property	Defines Schreier graphs as quivers with labeled edges. `SchreierGraph V ι`: type alias for vertices with quiver structure `schreierGraphLabelling`: prefunctor extracting edge labels `schreierGraphLabelling_isCovering`: the labelling is a covering for group actions `schreierGraph_action_commute`: label-preserving maps commute with the action Ported from [Lean 3 PR #18693](https://github.com/leanprover-community/mathlib3/pull/18693). This PR was written with AI assistance (Claude). The code has been reviewed by the author and their advisor. --- This is the first in a series of PRs splitting #35467 into smaller pieces, as suggested by reviewers. Upcoming PRs will add word evaluation, paths, connectivity, automorphisms, examples, and Cayley sum graphs.	t-combinatorics new-contributor LLM-generated	180/0	Mathlib.lean,Mathlib/Combinatorics/Quiver/Schreier.lean,docs/references.bib	3	33	['AntoineChambert-Loir', 'YaelDillies', 'ZRTMRH', 'github-actions']	nobody	1	2-61268 2 days ago	3-20738 3 days ago	21-80875 21 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	33/76	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/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	36	5	['gasparattila', 'github-actions', 'themathqueen']	j-loreaux assignee:j-loreaux	1	2-35611 2 days ago	5-12092 5 days ago	5-15899 5 days
36386	SnkXyx author:SnkXyx	feat(Algebra/MvPolynomial/Degrees): add some lemmas about `degreeOf`	These lemmas are used in #36103 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	86/0	Mathlib/Algebra/MvPolynomial/Degrees.lean	1	19	['Hagb', 'SnkXyx', 'dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'riccardobrasca']	dagurtomas assignee:dagurtomas	1	2-28250 2 days ago	2-30409 2 days ago	24-61135 24 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. This PR generalises #35776 to also unify `Graph`. ### Main definitions * `GraphLike α β Gr`: A typeclass parameterized by a vertex type `α`, dart type `β` and a graph type `Gr` (with `α` as an `outParam`). * `GraphLike.verts : Set α`: The set of vertices of the graph. * `GraphLike.darts : Set β`: The set of darts of the graph. * `GraphLike.Adj : α → α → Prop`: The adjacency relation, defined by default as `Nonempty (darts G u v)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	281/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean	4	42	['IvanRenison', 'Jun2M', 'SnirBroshi', 'github-actions', 'lauramonk', 'mathlib-merge-conflicts']	nobody	1	2-23847 2 days ago	15-78555 15 days ago	20-48371 20 days
37540	quantumsnow author:quantumsnow	feat(CategoryTheory/MorphismProperty/Comma): add MorphismProperty.Arrow	This is needed for the category of topological pairs (#36621). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	104/6	Mathlib/CategoryTheory/MorphismProperty/Comma.lean	1	15	['chrisflav', 'github-actions', 'joelriou', 'quantumsnow']	nobody	1	2-17786 2 days ago	2-17786 2 days ago	0-7409 2 hours
36833	harahu author:harahu	doc: demote repeated H1 headers	Having more than one H1 header per file confuses search engines and thus makes documentation more difficult to find. Hence, we make sure that lean files only have a single H1 header in them. In the case of `Mathlib/Tactic/Common.lean`, we achieve this by adding a new module header. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	12/10	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	9	2	['github-actions', 'harahu', 'vihdzp']	nobody	1	2-3421 2 days ago	2-3477 2 days ago	2-3871 2 days
37412	LLaurance author:LLaurance	chore(Analysis): shorten proofs by removing steps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	7/18	Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/ODE/PicardLindelof.lean	4	7	['LLaurance', 'github-actions', 'j-loreaux', 'themathqueen']	j-loreaux assignee:j-loreaux	1	1-69628 1 day ago	3-63368 3 days ago	4-30057 4 days
37628	JadAbouHawili author:JadAbouHawili	chore: Rename Xor' to Xor	Rename `Xor'` to `Xor` per the comment which recommended doing so after `v4.25.0-rc1` Moves: - Xor' --> Xor --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	75/66	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/GroupTheory/Index.lean,Mathlib/Logic/Basic.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/Order/SymmDiff.lean,Mathlib/Tactic/ITauto.lean,Mathlib/Topology/Algebra/Order/Archimedean.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Instances/AddCircle/DenseSubgroup.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Profinite.lean,MathlibTest/itauto.lean	18	19	['JadAbouHawili', 'Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'grunweg']	nobody	1	1-52497 1 day ago	1-85415 1 day ago	2-19560 2 days
35906	scp020 author:scp020	feat(Combinatorics/SimpleGraph/Walk): chords of walks	Define `Walk.IsChord` and `Walk.IsChordless` predicates in a new file `SimpleGraph/Walks/Chord.lean`. See "chord" in https://en.wikipedia.org/wiki/Glossary_of_graph_theory --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Walk.2EIsChordless.20live.20in.20mathlib.3F/with/575277309) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor maintainer-merge	59/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Chord.lean	2	68	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'scp020']	YaelDillies assignee:YaelDillies	1	1-50621 1 day ago	1-67758 1 day ago	26-57613 26 days
37463	hommmmm author:hommmmm	style(RingTheory/Ideal/KrullsHeightTheorem): capitalization convention for minimalPrimes	Fixed capitalization convention for `minimal_prime` to lower camel case `minimalPrime` according to mathlib naming conventions. There are 8 changed occurrences in `RingTheory/Ideal/KrullsHeightTheorem` and 2 in `RingTheory/Ideal/MinimalPrime/Localization`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory	14/10	Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean	2	12	['Multramate', 'github-actions', 'hommmmm', 'themathqueen']	nobody	1	1-41685 1 day ago	2-1698 2 days ago	5-41247 5 days
37626	NoahW314 author:NoahW314	feat(Algebra/Algebra/Operations): add `Submodule.mul_eq_bot`	Generalize `Ideal.mul_eq_bot` to work for submodules as well. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	16/13	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Spectrum/Prime/Basic.lean	4	6	['artie2000', 'eric-wieser', 'github-actions']	nobody	1	1-20310 1 day ago	1-20366 1 day ago	2-62827 2 days
35518	kim-em author:kim-em	chore: forbid prime (') in filenames, rename LinearCombination'	This PR renames `Mathlib/Tactic/LinearCombination'.lean` to `LinearCombinationPrime.lean` (and the corresponding test file), and adds a lint check to `modulesOSForbidden` to prevent future files with prime/apostrophe characters in their names. The `'` character in filenames causes shell escaping issues in scripts (any `find ... -name '*.lean'` or similar pattern needs careful quoting to handle these files correctly). 🤖 Prepared with Claude Code	file-removed t-meta LLM-generated merge-conflict	13/8	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombinationPrime.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination_prime.lean	6	8	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	1	1-20109 1 day ago	1-20109 1 day ago	25-42954 25 days
36664	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Commute): characterize when ordinal addition commutes	--- The proof is from ["Cardinal and Ordinal Numbers"](https://en.wikipedia.org/wiki/Cardinal_and_Ordinal_Numbers). A similar fact for multiplication is mentioned on [Wikipedia](https://en.wikipedia.org/wiki/Ordinal_arithmetic). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	51/0	Mathlib.lean,Mathlib/SetTheory/Ordinal/Commute.lean,docs/references.bib	3	20	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	alreadydone and vihdzp assignee:alreadydone assignee:vihdzp	1	1-14599 1 day ago	21-63309 21 days ago	22-32014 22 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	18/0	Mathlib/Order/RelIso/Basic.lean	1	6	['IvanRenison', 'SnirBroshi', 'eric-wieser', 'github-actions']	nobody	1	1-12898 1 day ago	1-12898 1 day ago	2-36423 2 days
37506	wwylele author:wwylele	feat(Analysis/InnerProductSpace): singleton basis for 1d space	This was brought up in #36462. Similar to existing `FiniteDimensional.basisSingleton`, this provides a OrthonormalBasis version. Also adds simp lemma for `∀ (i j : ι), P i j` for subsingleton `ι`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	49/4	Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Diam.lean,Mathlib/Logic/Basic.lean	5	35	['eric-wieser', 'github-actions', 'leanprover-radar', 'loefflerd', 'themathqueen', 'wwylele']	loefflerd assignee:loefflerd	2	1-866 1 day ago	1-25362 1 day ago	4-72003 4 days
35826	quangvdao author:quangvdao	feat(Probability/ProbabilityMassFunction): total variation distance and MetricSpace instance	Define total variation distance on probability mass functions, provide a `MetricSpace` instance, and prove the data processing inequality. The extended TV distance `PMF.etvDist` is defined in `ℝ≥0∞` as `(1/2) ∑ x, absDiff (p x) (q x)`, using a new symmetric absolute difference `ENNReal.absDiff`. The real-valued `PMF.tvDist` is its `toReal`. New definitions: - `ENNReal.absDiff`: symmetric absolute difference `(a - b) + (b - a)` - `PMF.etvDist`: extended total variation distance - `PMF.tvDist`: real-valued total variation distance - `PMF.instMetricSpace`: `MetricSpace` instance on `PMF α` Main results: - `ENNReal.absDiff_triangle`: triangle inequality for `absDiff` - `ENNReal.absDiff_tsum_le`: subadditivity over infinite sums - `PMF.etvDist_le_one`: TV distance is at most 1 - `PMF.etvDist_map_le`: data processing inequality (deterministic maps) - `PMF.etvDist_bind_right_le`: data processing inequality (Markov kernels) - `PMF.etvDist_option_punit`: closed form for binary distributions Supersedes #33680 with a complete, sorry-free implementation. See Zulip discussion: This PR was authored with the support of Claude (Cursor IDE). --- This PR provides a complete formalization of total variation distance for PMFs, including: 1. `ENNReal.absDiff` (`Mathlib/Data/ENNReal/AbsDiff.lean`): A symmetric absolute difference for `ℝ≥0∞` with triangle inequality, connection to real absolute value, and algebraic properties. The tsum-related lemmas (`absDiff_tsum_le`, `tsum_fiber`) are placed in the TV distance file to avoid pulling topology imports into `Data.ENNReal`. 2. `PMF.etvDist` / `PMF.tvDist` (`Mathlib/Probability/ProbabilityMassFunction/TotalVariation.lean`): Total variation distance with a `MetricSpace` instance, data processing inequality for both deterministic maps and Markov kernels, and a closed form for binary distributions. Compared to #33680, this PR: - Has no `sorry`s - Defines the distance in `ℝ≥0∞` first (following Mathlib convention for `edist`/`dist`) - Includes the data processing inequality - Has full documentation and passes all Mathlib linters Made with [Cursor](https://cursor.com)	t-measure-probability LLM-generated	459/0	Mathlib.lean,Mathlib/Data/ENNReal/AbsDiff.lean,Mathlib/Probability/ProbabilityMassFunction/TotalVariation.lean	3	6	['BoltonBailey', 'EtienneC30', 'github-actions', 'joneugster', 'quangvdao']	nobody	1	0-69927 19 hours ago	30-83130 30 days ago	30-83901 30 days
31242	plp127 author:plp127	feat: express filter as supremum of principal filter and free filter	Prove a filter is free iff it is smaller than the cofinite filter. Prove that every filter decomposes as the disjoint supremum of a principal filter and a free filter. --- - [x] depends on: #31264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	78/4	Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Lattice.lean	4	10	['Komyyy', 'YaelDillies', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	2	0-69479 19 hours ago	9-15319 9 days ago	33-38156 33 days
36720	YanYablonovskiy author:YanYablonovskiy	feat(Order): `OrderType.lift` and more order type API	Adding the universe lifting operation to `OrderType` , addresses a 'TODO' . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor maintainer-merge	41/2	Mathlib/Order/Types/Defs.lean	1	25	['YaelDillies', 'YanYablonovskiy', 'github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	2	0-44877 12 hours ago	14-39408 14 days ago	16-2954 16 days
36979	Komyyy author:Komyyy	feat: `↑(Nat.log m n) = Ordinal.log ↑m ↑n`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	12/3	Mathlib/SetTheory/Ordinal/Exponential.lean	1	22	['Komyyy', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	2	0-43598 12 hours ago	13-30257 13 days ago	14-82909 14 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	t-number-theory	645/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	51	['github-actions', 'jcommelin', 'kim-em', 'metakunt', 'qawbecrdtey', 'tb65536', 'vihdzp']	tb65536 assignee:tb65536	1	0-19967 5 hours ago	8-50693 8 days ago	38-43444 38 days
37022	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Cofinality): cof (a * b) = cof b	We also tag `isSuccLimit_omega0` as simp, so that simp can solve goals like `(ω_ ω).cof = ω` or `cof (x * ω) = ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	12/3	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	3	4	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	1	0-17185 4 hours ago	12-40547 12 days ago	14-43407 14 days
37304	vihdzp author:vihdzp	feat: if `s ∪ t` is directed then one of `s` or `t` is	--- Co-authored-by: Kamille Bidan <25210160030@m.fudan.edu.cn> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	57/0	Mathlib/Order/Bounds/Basic.lean	1	12	['NoneMore', 'b-mehta', 'fpvandoorn', 'github-actions', 'mathlib-bors', 'plp127', 'vihdzp']	nobody	1	0-15515 4 hours ago	0-15599 4 hours ago	3-22989 3 days
34227	stepan2698-cpu author:stepan2698-cpu	feat(Combinatorics/Schnirelmann): if sum of densities is at least one, the sumset covers the naturals	Proves an outstanding TODO item from Mathlib.Combinatorics.Schnirelmann : shows that if the sum of two densities is at least one, the sumset covers the positive naturals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	37/1	Mathlib/Combinatorics/Schnirelmann.lean	1	20	['FLDutchmann', 'YaelDillies', 'YanYablonovskiy', 'github-actions', 'grunweg', 'kbuzzard', 'stepan2698-cpu']	b-mehta assignee:b-mehta	1	0-13376 3 hours ago	1-18549 1 day ago	73-70217 73 days
28684	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): definition of regular ring	In this PR, we define regular ring as every localization is regular local ring, and proved polynomial over regular ring is regular. --- - [x] depends on: #28682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	63/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean	2	36	['Thmoas-Guan', 'artie2000', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	2	0-13246 3 hours ago	0-61971 17 hours ago	5-2374 5 days
37693	Maldooor author:Maldooor	chore(Analysis/InnerProductSpace/Reproducing): clarify TODO	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-analysis	3/3	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	2	['YaelDillies', 'github-actions']	nobody	1	0-8738 2 hours ago	0-29854 8 hours ago	0-29844 8 hours
35879	Jun2M author:Jun2M	feat(Combinatorics/Graph): graph deletion operations	This PR adds definitions and basic lemmas for deleting edges and vertices from a graph in Mathlib/Combinatorics/Graph/Delete.lean. It introduces the following operations: - `G ↾ F` (edgeRestrict): The subgraph of G restricted to the edges in F (vertices are preserved). - `G ＼ F` (edgeDelete): The subgraph of G with the edges in F deleted. - `G[X]` (induce): The subgraph of G induced by the set of vertices X. - `G - X` (vertexDelete): The graph obtained from G by deleting the set of vertices X. These definitions are accompanied by simp lemmas describing their edge sets, incidence relations, and basic properties such as monotonicity. Co-authored-by: Peter Nelson [apn.uni@gmail.com](mailto:apn.uni@gmail.com) --- - [x] depends on: #26770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	208/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Delete.lean	2	9	['Jun2M', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1	0-3960 1 hour ago	15-78701 15 days ago	15-84876 15 days
34154	euprunin author:euprunin	chore: golf using `grind` (and add four supporting `grind` annotations)	The goal of this golfing PR is to decrease the number of times lemmas are called explicitly (replacing calls to lemmas with calls to tactics). Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (shown if ≥10 ms before or after): * `Orientation.nonneg_inner_and_areaForm_eq_zero_iff_sameRay`: 311 ms before, 284 ms after 🎉 * `UV.compression_self`: 29 ms before, 19 ms after 🎉 * `IsSepClosed.exists_root_C_mul_X_pow_add_C_mul_X_add_C`: 405 ms before, 291 ms after 🎉 * `InnerProductGeometry.norm_add_eq_add_norm_iff_angle_eq_zero`: 425 ms before, 309 ms after 🎉 This golfing PR is batched under the following guidelines: * Up to ~5 changed files per PR * Up to ~25 changed declarations per PR * Up to ~100 changed lines per PR --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		9/30	Mathlib/Algebra/Polynomial/Degree/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Combinatorics/SetFamily/Compression/UV.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean	6	16	['Parcly-Taxel', 'Vierkantor', 'artie2000', 'euprunin', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536']	Vierkantor assignee:Vierkantor	1	0-2679 44 minutes ago	0-2945 48 minutes ago	64-27825 64 days
35963	Parcly-Taxel author:Parcly-Taxel	refactor: tidy `IdemSemiring` and `KleeneAlgebra`	* Remove `universe u` at the beginning in favour of `Type` Make `IdemSemiring` extend `OrderBot` rather than duplicating the fields * Correct the docstring for `KleeneAlgebra` * Derive Proposition 2 in Kozen's 1994 paper: ```lean one_add_mul_kstar (a : α) : 1 + a * a∗ = a∗ one_add_kstar_mul (a : α) : 1 + a∗ * a = a∗ ``` * Use `where` notation consistently in `Algebra.Order.Kleene`	t-algebra label:t-algebra$	83/85	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean	3	39	['Parcly-Taxel', 'YaelDillies', 'dagurtomas', 'eric-wieser', 'github-actions', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	2	0-317 5 minutes ago	0-830 13 minutes ago	34-5909 34 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	614-43896 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	614-43896 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	614-43895 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	614-43895 1 year ago	unknown	0-0 0 seconds
14167	alreadydone author:alreadydone	feat: Group scheme structure on Weierstrass curve	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-geometry workshop-AIM-AG-2024	727/41	Mathlib.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Scheme.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean	12	3	['Multramate', 'github-actions', 'jcommelin']	nobody	614-43895 1 year ago	649-4250 649 days ago	0-12 12 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	614-43894 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	614-43894 1 year ago	678-44592 678 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	614-43894 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	614-43894 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	614-43893 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	614-43893 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	614-43893 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	614-43893 1 year ago	706-79331 706 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	614-43893 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	614-43893 1 year ago	688-3880 688 days ago	5-74504 5 days
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	614-43893 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	614-43893 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	614-43893 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	614-43893 1 year ago	682-68321 682 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	614-43892 1 year ago	718-65988 718 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	614-43891 1 year ago	801-36015 801 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	614-43891 1 year ago	781-11941 781 days ago	1-29105 1 day
10594	lecopivo author:lecopivo	feat: `fun_trans` function transformation tactic e.g. for computing derivatives	feat: `fun_trans` function transformation tactic e.g. for computing derivatives Function transformation tactic/simproc. For example it can be used for computing derivatives. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	1819/56	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/MorExt.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunTrans/Attr.lean,Mathlib/Tactic/FunTrans/Core.lean,Mathlib/Tactic/FunTrans/Decl.lean,Mathlib/Tactic/FunTrans/Elab.lean,Mathlib/Tactic/FunTrans/Theorems.lean,Mathlib/Tactic/FunTrans/Types.lean,test/fun_prop2.lean,test/fun_prop_dev.lean,test/fun_trans_dev.lean	17	11	['github-actions']	nobody	614-43891 1 year ago	unknown	0-0 0 seconds
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	614-43891 1 year ago	664-22293 664 days ago	64-12984 64 days
10842	mcdoll author:mcdoll	chore: simplify proofs using new positivity extensions and tests	--- - [x] depends on: #10661 - [ ] depends on: #10796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR	98/50	Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/SpecialFunctions/Gaussian.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Unique.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Moments.lean,Mathlib/Probability/Variance.lean,Mathlib/Tactic/Positivity/Core.lean,test/positivity.lean	14	1	['leanprover-community-mathlib4-bot']	nobody	614-43891 1 year ago	unknown	0-0 0 seconds
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	614-43891 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	614-43891 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	614-43890 1 year ago	831-16214 831 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	614-43890 1 year ago	854-9253 854 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	614-43890 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	614-43890 1 year ago	861-77832 861 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	614-43890 1 year ago	831-9537 831 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	614-43890 1 year ago	854-33786 854 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	614-43890 1 year ago	850-16984 850 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	614-43890 1 year ago	847-75720 847 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	614-43890 1 year ago	821-1981 821 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	614-43890 1 year ago	unknown	0-0 0 seconds
9252	astrainfinita author:astrainfinita	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	614-43890 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	614-43890 1 year ago	804-74516 804 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	614-43890 1 year ago	808-79888 808 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	614-43890 1 year ago	808-85136 808 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	614-43890 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	614-43890 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	614-43890 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	614-43890 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	614-43890 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	614-43890 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	614-43889 1 year ago	900-6653 900 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	614-43889 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	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	614-43889 1 year ago	889-9386 889 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	614-43889 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	614-43889 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	614-43889 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	614-43889 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	614-43889 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	614-43889 1 year ago	893-12717 893 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	614-43889 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	614-43889 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	614-43889 1 year ago	912-31121 912 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	614-43889 1 year ago	847-27492 847 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	614-43889 1 year ago	908-78597 908 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	614-43889 1 year ago	902-38027 902 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	614-43889 1 year ago	760-53720 760 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	614-43889 1 year ago	668-60397 668 days ago	1-47913 1 day
7909	mcdoll author:mcdoll	fix(Tactic/Continuity): remove npowRec and add new tag for Continuous.pow	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology t-meta	14/9	Mathlib/Tactic/Continuity.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,test/Continuity.lean	3	2	['eric-wieser']	nobody	614-43889 1 year ago	893-69189 893 days ago	0-72515 20 hours
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	614-43889 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	614-43889 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	614-43889 1 year ago	869-64023 869 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	614-43888 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	614-43888 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	614-43888 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	614-43888 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	614-43888 1 year ago	1027-29940 1027 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	614-43888 1 year ago	1025-45014 1025 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	614-43888 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	614-43888 1 year ago	982-44250 982 days ago	9-71263 9 days
6079	eric-wieser author:eric-wieser	fix: deduplicate variables	`variables {A} [Ring A]` meant "update the binder of `A`" in Lean 3, but now means "create a duplicate variable called `A`" (or at least, does so when inspecting the state within the variables line). This removes a number of porting notes that were stumbling over this behavior. [Related Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/unexpected.20.60variable.60.20behaviour.3F/near/360154080) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI	1012/443	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Pi.lean,Mathlib/Algebra/GroupPower/Basic.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Aut.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Support.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Point.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/Analysis/Calculus/ContDiff.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/LocalExtr.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Independent.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/Completion.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/Multilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Endofunctor/Algebra.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean	302	1	['timotree3']	nobody	614-43888 1 year ago	unknown	0-0 0 seconds
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	614-43888 1 year ago	unknown	0-0 0 seconds
6210	MohanadAhmed author:MohanadAhmed	feat(Data/IsROrC/Basic): add a `StarOrderedRing` instance	This PR implements a suggestion by @urkud on [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/PartialOrder.20and.20StarOrderedRing.20on.20IsROrC) on how to get a `StarOrderedRing` on the `IsROrC` class. In that discussion the suggested step were: 1. Add PartialOrder K to the list of extends and add le_iff_re_im : z ≤ w ↔ re z ≤ re w ∧ im z = im w to the list of axioms. 2. Prove StarOrderedRing instance for any IsROrC. 3. Add (almost trivial) le_iff_re_im proofs to IsROrC instances for real and complex numbers. This PR does exactly these three steps --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra t-analysis label:t-algebra$	25/24	Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/IsROrC/Basic.lean	4	19	['MohanadAhmed', 'eric-wieser', 'j-loreaux']	nobody	614-43888 1 year ago	971-3996 971 days ago	12-17588 12 days
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	614-43888 1 year ago	753-10162 753 days ago	60-84345 60 days
6328	astrainfinita author:astrainfinita	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	614-43888 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	614-43888 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	614-43888 1 year ago	858-83030 858 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	614-43888 1 year ago	886-29888 886 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	614-43888 1 year ago	769-41197 769 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	614-43887 1 year ago	953-68023 953 days ago	45-49128 45 days
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	610-20197 1 year ago	713-58239 713 days ago	0-17 17 seconds
13852	astrainfinita author:astrainfinita	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	610-13877 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	607-31866 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	602-1042 1 year ago	604-10484 604 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	600-37542 1 year ago	912-18421 912 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	600-37433 1 year ago	726-46270 726 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	600-36966 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	600-35365 1 year ago	691-40570 691 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	600-22129 1 year ago	654-42624 654 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	599-36281 1 year ago	629-83263 629 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	599-34150 1 year ago	644-68827 644 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	599-33947 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	599-33810 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	599-33795 1 year ago	716-8500 716 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	599-33757 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	599-33747 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	599-33733 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	599-33723 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	599-33642 1 year ago	821-33069 821 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	599-33607 1 year ago	755-42989 755 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	599-33575 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	599-33429 1 year ago	643-16459 643 days ago	143-73801 143 days
9154	astrainfinita author:astrainfinita	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	599-33220 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	599-33194 1 year ago	953-49717 953 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	599-33139 1 year ago	988-70047 988 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	599-33133 1 year ago	965-31187 965 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	599-33001 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	599-31743 1 year ago	631-45935 631 days ago	50-78405 50 days
15585	astrainfinita author:astrainfinita	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	597-65409 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	597-65409 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	596-278 1 year ago	659-76264 659 days ago	1-84718 1 day
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	596-36 1 year ago	682-10020 682 days ago	29-50022 29 days
9978	astrainfinita author:astrainfinita	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	595-86228 1 year ago	793-80410 793 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	595-85539 1 year ago	707-33212 707 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	595-64102 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	595-41226 1 year ago	714-31619 714 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	595-21190 1 year ago	630-27412 630 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	595-10243 1 year ago	604-56405 604 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	593-23464 1 year ago	712-15092 712 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	593-23444 1 year ago	629-15812 629 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	593-23282 1 year ago	902-47498 902 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	587-36886 1 year ago	636-38773 636 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	586-5162 1 year ago	606-85260 606 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	585-3075 1 year ago	585-7336 585 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	584-28376 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	584-27364 1 year ago	unknown	0-0 0 seconds
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	581-82425 1 year ago	613-41684 613 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	581-12818 1 year ago	585-46327 585 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	580-20878 1 year ago	652-77397 652 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	580-20878 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	575-15622 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	574-62159 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	574-43219 1 year ago	634-83747 634 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	574-19684 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	573-40515 1 year ago	967-35853 967 days ago	2-35869 2 days
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	573-11676 1 year ago	725-24418 725 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	572-56051 1 year ago	881-3833 881 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	568-84984 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	568-65284 1 year ago	651-31844 651 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	566-35838 1 year ago	753-9508 753 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	564-24447 1 year ago	565-21536 565 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	561-73812 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	559-46733 1 year ago	663-27210 663 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	559-7084 1 year ago	646-82431 646 days ago	0-273 4 minutes
17171	astrainfinita author:astrainfinita	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	555-5426 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	553-63486 1 year ago	914-27703 914 days ago	0-16 16 seconds
17127	astrainfinita author:astrainfinita	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	553-58529 1 year ago	553-58529 553 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	551-3062 1 year ago	566-31136 566 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	551-3062 1 year ago	566-31137 566 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	551-3061 1 year ago	566-26887 566 days ago	0-613 10 minutes
5995	astrainfinita author:astrainfinita	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	544-17271 1 year ago	669-37932 669 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	541-49612 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	539-24411 1 year ago	542-22109 542 days ago	49-319 49 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	539-24035 1 year ago	579-56369 579 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	537-61203 1 year ago	656-7422 656 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	535-46475 1 year ago	unknown	0-0 0 seconds
10796	mcdoll author:mcdoll	feat(Tactic/Positivity): non-negativity of functions	--- This makes the `Finset.sum` and `integral_nonneg` extensions even more useful. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	27/0	Mathlib/Tactic/Positivity/Core.lean	1	1	['YaelDillies']	nobody	533-43057 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	533-25719 1 year ago	682-7817 682 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	531-22260 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	528-42734 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	520-37047 1 year ago	598-11028 598 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	518-70086 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	518-69840 1 year ago	790-33139 790 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	518-48397 1 year ago	569-37228 569 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	517-82594 1 year ago	582-71040 582 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	517-22407 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	516-53995 1 year ago	516-53995 516 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	515-41266 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	514-10116 1 year ago	549-85828 549 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	514-9747 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	510-61939 1 year ago	818-32009 818 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	509-48948 1 year ago	523-35136 523 days ago	109-82807 109 days
17675	astrainfinita author:astrainfinita	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	509-24081 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	508-33341 1 year ago	807-33784 807 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	507-43095 1 year ago	658-38731 658 days ago	63-69226 63 days
16637	astrainfinita author:astrainfinita	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	507-42333 1 year ago	572-49689 572 days ago	1-49655 1 day
18765	astrainfinita author:astrainfinita	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	506-84994 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	504-23787 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	504-19315 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	504-958 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	503-5969 1 year ago	731-33397 731 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	502-29311 1 year ago	543-14892 543 days ago	0-74903 20 hours
17623	astrainfinita author:astrainfinita	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	502-29311 1 year ago	509-21870 509 days ago	33-53295 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	500-52963 1 year ago	unknown	0-0 0 seconds
17624	astrainfinita author:astrainfinita	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	498-66483 1 year ago	543-13762 543 days ago	0-465 7 minutes
17513	astrainfinita author:astrainfinita	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	497-25505 1 year ago	541-27370 541 days ago	4-72589 4 days
17515	astrainfinita author:astrainfinita	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	497-25504 1 year ago	546-13016 546 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	496-30750 1 year ago	496-30750 496 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	494-6827 1 year ago	494-6827 494 days ago	3-72207 3 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	482-58896 1 year ago	482-58896 482 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	479-71365 1 year ago	506-32747 506 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	478-32291 1 year ago	500-54537 500 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	472-42111 1 year ago	669-15760 669 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	472-42110 1 year ago	758-31591 758 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	472-24371 1 year ago	492-50016 492 days ago	0-370 6 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	472-15666 1 year ago	unknown	0-0 0 seconds
18294	astrainfinita author:astrainfinita	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	467-23303 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	458-83000 1 year ago	607-78066 607 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	458-82877 1 year ago	534-82230 534 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	456-57530 1 year ago	1082-59561 1082 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	456-57529 1 year ago	1068-52571 1068 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	454-75070 1 year ago	454-75070 454 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	453-13113 1 year ago	453-13113 453 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	448-19702 1 year ago	448-19702 448 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	446-6977 1 year ago	538-84947 538 days ago	0-4704 1 hour
18474	astrainfinita author:astrainfinita	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	446-6732 1 year ago	446-6732 446 days ago	76-67978 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	445-41666 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	445-26063 1 year ago	566-37224 566 days ago	9-13962 9 days
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	444-78382 1 year ago	484-77995 484 days ago	33-8818 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	443-10565 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	442-85636 1 year ago	634-51063 634 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	442-70232 1 year ago	534-80251 534 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	441-39562 1 year ago	441-39562 441 days ago	69-24210 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	440-13641 1 year ago	445-67442 445 days ago	27-52347 27 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	438-42852 1 year ago	500-54557 500 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	433-30989 1 year ago	433-30989 433 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	431-21582 1 year ago	1078-53121 1078 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	430-85487 1 year ago	460-11366 460 days ago	101-64856 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	430-85364 1 year ago	457-66820 457 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	427-10729 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	425-50166 1 year ago	731-32789 731 days ago	91-37374 91 days
18719	astrainfinita author:astrainfinita	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	424-24983 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	423-6184 1 year ago	457-42114 457 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	422-5305 1 year ago	500-54549 500 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	420-74699 1 year ago	427-39216 427 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	420-24190 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	420-24189 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	420-24188 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	419-86116 1 year ago	761-23395 761 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	418-16226 1 year ago	439-44496 439 days ago	52-4018 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	416-22645 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	416-22398 1 year ago	423-34020 423 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	410-77569 1 year ago	410-77569 410 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	410-65226 1 year ago	623-37244 623 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	410-32533 1 year ago	831-17864 831 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	408-84597 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	408-83786 1 year ago	415-79851 415 days ago	2-38741 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	408-6070 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	404-43966 1 year ago	412-46596 412 days ago	4-9045 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	404-18699 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	404-17063 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	403-82834 1 year ago	576-27665 576 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	401-9027 1 year ago	651-80027 651 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	399-32117 1 year ago	637-15044 637 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	399-31617 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	399-20521 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	398-4086 1 year ago	434-7863 434 days ago	17-17852 17 days
16000	YaelDillies author:YaelDillies	feat: Croot-Sisask Almost Periodicity	Almost periodicity is nowadays a standard tool in additive combinatorics. From LeanAPAP --- - [ ] depends on: #15443 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics t-analysis blocked-by-other-PR	0/0		0	4	['github-actions', 'leanprover-community-mathlib4-bot', 'mergify']	nobody	397-33407 1 year ago	594-27078 594 days ago	0-159 2 minutes
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	397-20668 1 year ago	404-2595 404 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	397-17010 1 year ago	397-17010 397 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	395-19023 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	395-17942 1 year ago	403-44031 403 days ago	0-2574 42 minutes
18470	astrainfinita author:astrainfinita	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	392-74837 1 year ago	392-74837 392 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	391-12506 1 year ago	528-24025 528 days ago	22-48253 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	389-74569 1 year ago	571-40519 571 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	389-17608 1 year ago	395-73273 395 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	389-12836 1 year ago	572-16065 572 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	385-39265 1 year ago	385-39265 385 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	384-71299 1 year ago	645-48790 645 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	383-6932 1 year ago	504-71260 504 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	381-81880 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	380-25968 1 year ago	480-66639 480 days ago	21-82868 21 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	375-69900 1 year ago	601-13043 601 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	374-18049 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	371-40168 1 year ago	433-72242 433 days ago	7-31913 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	370-48235 1 year ago	395-77191 395 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	369-74065 1 year ago	370-78222 370 days ago	0-949 15 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	369-31471 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	369-24127 1 year ago	384-57618 384 days ago	0-83153 23 hours
13124	astrainfinita author:astrainfinita	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	368-52104 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	365-43224 1 year ago	559-20595 559 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	364-36269 11 months ago	384-86109 384 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	363-61596 11 months 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	362-50127 11 months ago	385-54504 385 days ago	12-18667 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	362-29633 11 months 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	362-29144 11 months 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	362-25412 11 months ago	362-25413 362 days ago	57-47357 57 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	362-25410 11 months ago	362-25412 362 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	362-24883 11 months ago	404-28918 404 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	362-24883 11 months ago	404-27659 404 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	361-56248 11 months 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	361-37944 11 months ago	494-26361 494 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	361-28140 11 months ago	436-20340 436 days ago	5-6208 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	360-48149 11 months ago	391-49648 391 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	357-18843 11 months ago	unknown	0-0 0 seconds
16314	astrainfinita author:astrainfinita	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	356-50376 11 months ago	356-50378 356 days ago	55-36935 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	356-34029 11 months ago	357-85828 357 days ago	5-26623 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	356-23724 11 months ago	unknown	0-0 0 seconds
24058	astrainfinita author:astrainfinita	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	356-13634 11 months 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	355-82029 11 months ago	654-25536 654 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	355-81908 11 months 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	355-81883 11 months 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	355-81841 11 months ago	630-13321 630 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	355-81709 11 months ago	962-38572 962 days ago	29-67421 29 days
15483	astrainfinita author:astrainfinita	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	355-81669 11 months ago	604-33599 604 days ago	4-79214 4 days
16594	astrainfinita author:astrainfinita	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	355-81445 11 months ago	560-34592 560 days ago	14-58900 14 days
24106	astrainfinita author:astrainfinita	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	355-53175 11 months 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	355-48959 11 months 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	353-85785 11 months ago	497-19351 497 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	353-85738 11 months ago	437-9806 437 days ago	8-45680 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	353-85567 11 months ago	390-18434 390 days ago	3-29389 3 days
19613	madvorak author:madvorak	refactor(Combinatorics/Optimization/ValuedCSP): make only valid `FractionalOperation` possible	Originally `FractionalOperation` was any multiset (possible empty). Then `FractionalOperation.IsValid` said it was nonempty. Instead, I would like to make it nonempty by definition. As a result, empty/invalid fractional operation couldn't be declared at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/17	Mathlib/Combinatorics/Optimization/ValuedCSP.lean	1	1	['github-actions']	nobody	353-85285 11 months ago	483-20026 483 days ago	9-74124 9 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	353-81870 11 months ago	433-72843 433 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	352-17848 11 months ago	unknown	0-0 0 seconds
12605	astrainfinita author:astrainfinita	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	352-12463 11 months ago	684-44034 684 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	349-38286 11 months ago	362-48927 362 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	349-17718 11 months ago	351-34623 351 days ago	0-217 3 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	347-15061 11 months ago	347-15063 347 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	347-3758 11 months ago	347-3759 347 days ago	2-12017 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	345-16215 11 months 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	345-13933 11 months ago	397-25954 397 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	343-83471 11 months 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	343-31129 11 months ago	368-34143 368 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	343-23533 11 months ago	410-59608 410 days ago	23-20117 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	342-16201 11 months ago	394-2567 394 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	341-21440 11 months ago	631-20185 631 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	338-46653 11 months ago	339-29576 339 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	338-46485 11 months 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	338-46309 11 months 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	338-46224 11 months 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	338-46037 11 months 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	338-46017 11 months 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	338-46007 11 months 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	338-45991 11 months 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	338-45986 11 months ago	633-32540 633 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	338-45946 11 months ago	643-62291 643 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	338-45831 11 months 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	338-45766 11 months 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	338-45577 11 months ago	869-17257 869 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	338-45565 11 months ago	891-40560 891 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	338-45559 11 months 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	338-45554 11 months 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	338-45507 11 months 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	338-45473 11 months 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	338-45469 11 months ago	567-6842 567 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	338-45455 11 months 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	338-45339 11 months 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	338-45306 11 months 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	338-45119 11 months 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	337-37790 11 months 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	337-29123 11 months ago	343-57675 343 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	337-191 11 months 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	335-78988 11 months ago	605-15773 605 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	334-80949 10 months ago	412-19572 412 days ago	43-81252 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	334-5873 10 months 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	332-76829 10 months ago	332-76829 332 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	332-12623 10 months ago	332-12623 332 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	330-38167 10 months ago	330-38167 330 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	329-14548 10 months 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	328-36232 10 months 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	328-30607 10 months 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	328-14937 10 months ago	345-57889 345 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	327-25700 10 months ago	336-5702 336 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	326-26942 10 months ago	572-19760 572 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 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	1	['github-actions']	nobody	325-24844 10 months ago	325-24657 325 days ago	0-874 14 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	324-21478 10 months ago	868-45833 868 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	322-52882 10 months ago	441-26670 441 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	318-78453 10 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	316-22771 10 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	314-10508 10 months ago	314-10510 314 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	309-23134 10 months ago	710-72405 710 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	307-17892 10 months ago	539-69325 539 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	305-27075 10 months ago	305-27966 305 days ago	0-10787 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	304-60515 10 months ago	502-21456 502 days ago	87-65922 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	304-60515 10 months ago	592-35095 592 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	303-68861 9 months ago	687-10114 687 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	303-34150 9 months ago	365-25828 365 days ago	0-7729 2 hours
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	303-33335 9 months ago	303-33337 303 days ago	6-39812 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	302-50002 9 months ago	418-86281 418 days ago	0-6023 1 hour
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	298-74049 9 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	296-61414 9 months ago	435-12995 435 days ago	27-62333 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	295-18763 9 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	295-17476 9 months ago	295-18173 295 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	295-16907 9 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	294-16494 9 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	293-4774 9 months ago	293-4790 293 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	291-39631 9 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	291-25076 9 months ago	523-22975 523 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	291-25074 9 months ago	523-24618 523 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	291-25073 9 months ago	523-25260 523 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	289-83007 9 months ago	289-83007 289 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	288-7364 9 months ago	526-33580 526 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	287-79786 9 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	286-77803 9 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	283-46086 9 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	283-42060 9 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	279-23189 9 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	275-61561 9 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	275-59337 9 months ago	547-6980 547 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	275-58831 9 months ago	388-23003 388 days ago	0-1295 21 minutes
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	275-58830 9 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	275-58425 9 months ago	275-58425 275 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	275-58424 9 months ago	275-58424 275 days ago	40-60910 40 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	275-58178 9 months ago	275-58179 275 days ago	45-4562 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	275-58176 9 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	275-58175 9 months ago	308-33292 308 days ago	6-44784 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	275-58172 9 months ago	313-81926 313 days ago	0-30 30 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	275-58160 9 months ago	292-9483 292 days ago	10-56011 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	275-58031 9 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	275-57866 9 months ago	275-57866 275 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	275-57864 9 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	275-55876 9 months ago	292-25184 292 days ago	0-1118 18 minutes
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	275-55597 9 months ago	283-42403 283 days ago	0-2032 33 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	275-55595 9 months ago	283-39023 283 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	275-26860 9 months ago	275-25767 275 days ago	32-74826 32 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	274-23295 9 months ago	274-23296 274 days ago	69-52361 69 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	273-61456 8 months ago	273-80663 273 days ago	3-72995 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	272-41387 8 months ago	273-4938 273 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	272-39244 8 months ago	272-39244 272 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	270-45318 8 months ago	272-39246 272 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	269-20044 8 months ago	269-21466 269 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	269-1946 8 months ago	unknown	0-0 0 seconds
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	265-28062 8 months ago	298-9417 298 days ago	3-31703 3 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	263-34523 8 months ago	406-34028 406 days ago	31-68555 31 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	258-65048 8 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	257-79002 8 months ago	264-44769 264 days ago	45-38763 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	257-35888 8 months ago	277-21604 277 days ago	0-10699 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	257-8149 8 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	256-36901 8 months ago	269-38667 269 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	256-15756 8 months ago	256-16094 256 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	254-66470 8 months ago	333-78575 333 days ago	0-328 5 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	251-20061 8 months ago	600-23514 600 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	249-30377 8 months ago	720-39311 720 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	249-30315 8 months ago	786-23241 786 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	249-30224 8 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	249-27958 8 months ago	295-13049 295 days ago	0-1208 20 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	249-13201 8 months ago	468-80702 468 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	248-69173 8 months ago	320-29813 320 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	248-69162 8 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	248-31183 8 months ago	248-32381 248 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	248-17638 8 months ago	252-1502 252 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	248-15483 8 months ago	unknown	0-0 0 seconds
27826	xgenereux author:xgenereux	feat(Subsemiring): mk_eq_zero	Add a `mk_eq_zero` lemma for `Subsemiring`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	4/0	Mathlib/Algebra/Ring/Subsemiring/Defs.lean	1	3	['eric-wieser', 'github-actions', 'xgenereux']	nobody	248-12665 8 months ago	248-15747 248 days ago	0-8982 2 hours
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	245-36866 8 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	245-36748 8 months ago	275-57865 275 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	245-36741 8 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	245-36736 8 months ago	293-79954 293 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	245-36722 8 months ago	293-80121 293 days ago	0-51 51 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 blocked-by-other-PR 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', 'mathlib4-dependent-issues-bot', 'ocfnash']	nobody	245-36521 8 months ago	unknown	0-0 0 seconds
25425	Paul-Lez author:Paul-Lez	feat(LinearAlgebra/Basis/HasCanonicalBasis): propose `HasCanonicalBasis` class	Context: in some cases, e.g. writing down PDEs, having a notion of partial derivatives can be useful. In an ideal world (as mentioned by @ocfnash in [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Partial.20derivatives/with/463936246)), one could write something along the lines of `open scoped PartialDerivatives` in order to access nice notation for this. This PR introduces a notion of a canonical basis for a module in order to allow taking partial derivatives with respect to it. A later PR (which I am about open) would then propose a notation for taking partial derivatives (defined using `lineDeriv` in order to avoid requiring Frechet-differentiability assumptions). The goal here is to have notation that works equally well on e.g. `𝕜 × 𝕜` and `EuclideanSpace 𝕜 (Fin 2)` and so on. I've opened this PR as a draft in order to get some initial feedback on the content (and whether this is considered appropriate for Mathlib!); the file itself would need to be split (e.g. the instances defined should probably go in different files) Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	105/0	Mathlib.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	245-36516 8 months ago	unknown	0-0 0 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	245-36511 8 months ago	308-30293 308 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	245-36506 8 months ago	275-58175 275 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	245-36466 8 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	245-15225 8 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	244-38933 8 months ago	285-63356 285 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	244-38648 8 months ago	388-75854 388 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	244-38600 8 months ago	388-75853 388 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	244-38593 8 months ago	378-70886 378 days ago	10-44563 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	244-38549 8 months ago	420-37583 420 days ago	32-79324 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	244-38534 8 months ago	449-14468 449 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	244-38527 8 months ago	517-47096 517 days ago	0-1609 26 minutes
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	244-38521 8 months ago	505-60414 505 days ago	13-6188 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	244-38465 8 months ago	424-23025 424 days ago	0-19114 5 hours
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	244-38264 8 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	244-38257 8 months ago	457-39596 457 days ago	193-74502 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	244-35992 8 months ago	245-42733 245 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	243-73859 8 months ago	243-73859 243 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	243-69208 8 months ago	547-25915 547 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	243-58567 8 months ago	312-48088 312 days ago	0-444 7 minutes
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	243-56778 8 months ago	249-70419 249 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	242-74666 7 months ago	unknown	0-0 0 seconds
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	239-68926 7 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	239-42068 7 months ago	440-16883 440 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	239-35035 7 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	238-19962 7 months ago	238-19963 238 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	238-19591 7 months ago	238-19592 238 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	238-15587 7 months ago	238-15623 238 days ago	0-749 12 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	238-13312 7 months ago	327-81071 327 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	236-34751 7 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	236-34215 7 months ago	236-34216 236 days ago	32-70098 32 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	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	236-33938 7 months ago	384-18820 384 days ago	0-1302 21 minutes
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	236-2187 7 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	235-75411 7 months ago	235-75411 235 days ago	71-28496 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	234-41857 7 months ago	248-20693 248 days ago	0-5704 1 hour
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. --- - [ ] 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', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	234-12361 7 months ago	632-10313 632 days ago	7-77799 7 days
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	233-41406 7 months ago	418-53895 418 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	233-31752 7 months ago	447-23722 447 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	233-23266 7 months ago	255-84221 255 days ago	0-92 1 minute
14583	lecopivo author:lecopivo	fix: make concrete cycle notation local	fix: make c[...] notation for concrete cycles local --- The notation for concrete cycles prevents you using `c[i]` notation for `c : Array _` This currently does not work ``` import Mathlib variable (c : Array Nat) (i : Fin c.size) #check c[i] -- breaks because of notation for concrete cycles ``` This PR just marks it as local to prevent this issue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	1/1	Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	1	3	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	231-42580 7 months ago	635-79146 635 days ago	0-12793 3 hours
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	231-32566 7 months ago	657-45368 657 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	231-31837 7 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	230-53564 7 months ago	233-39093 233 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	229-78891 7 months ago	229-78892 229 days ago	0-66771 18 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	229-74530 7 months ago	328-19579 328 days ago	1-55872 1 day
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	228-21617 7 months ago	228-21618 228 days ago	2-47570 2 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	228-3672 7 months ago	450-60631 450 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	227-66703 7 months ago	928-19188 928 days ago	0-84 1 minute
13795	astrainfinita author:astrainfinita	perf(Algebra/{Group, GroupWithZero, Ring}/InjSurj): reduce everything	--- - [ ] depends on: #15192 - [ ] depends on: #15476 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	340/194	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,scripts/noshake.json	9	37	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	227-27688 7 months ago	356-42693 356 days ago	47-81764 47 days
28095	Equilibris author:Equilibris	Univ generic corec	Draft PR: Adding variable universe corecursor for PFunctor --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict new-contributor	321/70	Mathlib/Data/PFunctor/Multivariate/Basic.lean,Mathlib/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/TypeVec.lean	3	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	226-75334 7 months ago	unknown	0-0 0 seconds
28150	Equilibris author:Equilibris	chore: clean up proofs typevec proofs	While adding variable universe corecs I found a lot of theorems in typevec that could do with a bit of a clean-up --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data new-contributor	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	226-75333 7 months ago	226-75334 226 days ago	13-49738 13 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	226-54653 7 months ago	249-30575 249 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	226-54607 7 months ago	236-19651 236 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	226-29874 7 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	226-16485 7 months ago	249-30576 249 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	226-16246 7 months ago	255-13943 255 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	225-19696 7 months ago	225-25140 225 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	223-41183 7 months ago	245-23160 245 days ago	85-42087 85 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	222-19066 7 months ago	241-70077 241 days ago	14-27544 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	221-59819 7 months ago	221-59820 221 days ago	13-2028 13 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)) * card V ^ 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/)	merge-conflict WIP blocked-by-other-PR t-combinatorics	757/14	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	221-23259 7 months ago	229-40202 229 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	221-23258 7 months ago	229-39975 229 days ago	0-74 1 minute
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	221-23257 7 months ago	229-39791 229 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	220-81868 7 months ago	270-77224 270 days ago	0-311 5 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	220-81743 7 months ago	266-21797 266 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	220-81741 7 months ago	265-42290 265 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	220-81740 7 months ago	265-9422 265 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	220-58515 7 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	217-35535 7 months ago	298-43670 298 days ago	0-829 13 minutes
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	217-34925 7 months ago	251-39172 251 days ago	19-75957 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	217-2185 7 months ago	246-72264 246 days ago	1-28996 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	216-56292 7 months ago	315-27739 315 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	215-73820 7 months ago	224-24974 224 days ago	0-19882 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	214-75930 7 months ago	270-36024 270 days ago	0-75052 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	213-47805 7 months ago	214-21054 214 days ago	17-74458 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	212-20709 7 months ago	236-12237 236 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	210-19765 6 months ago	210-19766 210 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	210-14804 6 months ago	265-44499 265 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	209-74014 6 months ago	210-18717 210 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	209-28655 6 months ago	266-49967 266 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	209-22516 6 months ago	209-22517 209 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	208-42080 6 months ago	226-29017 226 days ago	0-601 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	207-78240 6 months ago	687-30772 687 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	207-67393 6 months ago	207-68138 207 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	207-61882 6 months ago	211-70840 211 days ago	0-22091 6 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	207-18238 6 months ago	298-26076 298 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	206-76901 6 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	205-82223 6 months ago	398-83804 398 days ago	0-27 27 seconds
27933	grunweg author:grunweg	chore(OrdNode): format code example in code blocks	Wrap them in code blocks (and unindent them; that indentation is not needed any more). This also avoids warnings from the linter in #27898. ------- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-data	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	205-59549 6 months ago	205-59550 205 days ago	39-69478 39 days
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/)	merge-conflict large-import awaiting-CI t-meta	144/26	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,Mathlib/Tactic/TacticAnalysis/FunProp.lean,MathlibTest/TacticAnalysis2.lean	6	12	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	205-21807 6 months ago	226-32013 226 days ago	0-260 4 minutes
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	204-11024 6 months ago	220-42833 220 days ago	100-20975 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	204-11023 6 months ago	230-11987 230 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	203-39317 6 months ago	228-2695 228 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	203-34760 6 months ago	203-34761 203 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	203-25417 6 months ago	235-11547 235 days ago	28-14094 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	203-23376 6 months ago	231-56052 231 days ago	0-1522 25 minutes
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	202-1220 6 months ago	202-678 202 days ago	0-71078 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	201-37953 6 months ago	227-38738 227 days ago	17-62721 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	201-33562 6 months ago	201-40668 201 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	200-82881 6 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	200-27545 6 months ago	244-85582 244 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	198-29680 6 months ago	242-43743 242 days ago	0-2498 41 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	196-6046 6 months ago	210-26218 210 days ago	13-55255 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	194-46357 6 months ago	194-46358 194 days ago	19-81030 19 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	194-21716 6 months ago	206-26079 206 days ago	0-1498 24 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	193-56615 6 months ago	208-83054 208 days ago	0-160 2 minutes
29657	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add Markov categories	This PR adds Markov categories to the category theory library. A Markov category is a symmetric monoidal category where every object has canonical copy and delete morphisms that form commutative comonoids. ## What this gives mathlib In a Markov category, morphisms model probabilistic processes. The copy morphism `X → X ⊗ X` creates perfect correlation (both outputs always equal). The delete morphism `X → I` marginalizes (sums/integrates out variables). This structure captures probability theory categorically. The same theorem proves results for: - Finite probability (stochastic matrices) - Measure theory (Markov kernels) - Kleisli categories of probability monads Fritz (2020) used this to prove categorical versions of Fisher-Neyman, Basu's theorem, and other core statistics results. ## Implementation - `MarkovCategory`: Extends `SymmetricCategory` with canonical comonoid structure - `copyMor X : X ⟶ X ⊗ X` and `delMor X : X ⟶ I` for each object - Coherence axioms: commutativity, counitality, coassociativity - Compatibility with tensor products Key design point: The comonoid structure is canonical (fields of the typeclass), not chosen. This matches the probability interpretation where there's exactly one way to copy/marginalize. ## Examples included 1. Cartesian categories: Every cartesian monoidal category forms a Markov category where copy is the diagonal `x ↦ (x,x)` and delete is the terminal morphism. All morphisms are deterministic. 2. FinStoch: Objects are finite types. Morphisms are stochastic matrices (rows sum to 1). This models finite probability spaces with the usual matrix multiplication for composition. ## Scope and review notes This PR provides the basic structure only. Future PRs would add: - Conditional independence - Sufficient statistics - Connection to measure-theoretic probability - More examples (Kleisli categories, Gaussian categories) I'm neither an expert in this material nor in Lean; I've only read a few papers on Markov categories and have gone through tutorial material in Lean. Please review for mathematical correctness and idiomatic Lean. I kept this PR small to check if mathlib wants this addition and to ensure it meets repository standards. ## Why add this now Markov categories provide a useful abstraction level for probability in type theory. Adding it to mathlib enables future work on categorical probability and statistics. In particular, I'm working on a probabilistic programming library and would like to write some proofs using these constructs. ## References - Fritz, T. (2020). [A synthetic approach to Markov kernels, conditional independence and theorems on sufficient statistics](https://arxiv.org/abs/1908.07021). Advances in Mathematics, 370, 107239. - Cho, K., & Jacobs, B. (2019). [Disintegration and Bayesian inversion via string diagrams](https://arxiv.org/abs/1709.00322). Mathematical Structures in Computer Science, 29(7), 938-971. --- All definitions include docstrings. The PR has tests for the core functionality. [![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	2414/7	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Monad/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Braided.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/CopyDiscard.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Markov.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Bimon_.lean,Mathlib/CategoryTheory/Monoidal/CommComon_.lean,Mathlib/CategoryTheory/Monoidal/Comon_.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	16	28	['github-actions', 'jcreinhold', 'joelriou', 'mathlib4-merge-conflict-bot']	nobody	193-22547 6 months ago	198-28671 198 days ago	0-10638 2 hours
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	192-24458 6 months ago	248-22018 248 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	192-21467 6 months ago	273-21404 273 days ago	73-13048 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	189-36760 6 months ago	290-46160 290 days ago	0-47289 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	189-11549 6 months ago	189-11550 189 days ago	0-4775 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	189-11547 6 months ago	257-30041 257 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	189-11545 6 months ago	256-15742 256 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	189-11543 6 months ago	255-13540 255 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	189-11418 6 months ago	250-17281 250 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	189-11416 6 months ago	250-17630 250 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	189-11415 6 months ago	250-17284 250 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	189-11413 6 months ago	250-16544 250 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	189-11411 6 months ago	249-36172 249 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	189-11410 6 months ago	249-36692 249 days ago	0-507 8 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	188-65194 6 months ago	188-65194 188 days ago	48-73998 48 days
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	188-30951 6 months ago	283-38235 283 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	187-83718 6 months ago	242-43234 242 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	187-37815 6 months ago	279-42356 279 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	187-34176 6 months ago	279-43348 279 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	186-36063 6 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	186-2687 6 months ago	238-17426 238 days ago	0-537 8 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	185-76411 6 months ago	188-55217 188 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	185-29489 6 months ago	187-39341 187 days ago	0-11345 3 hours
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	185-17290 6 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	184-15891 6 months ago	354-74664 354 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	184-2506 6 months ago	184-2506 184 days ago	46-26438 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	183-31614 6 months ago	184-26059 184 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	182-75491 6 months ago	272-61404 272 days ago	0-401 6 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	182-22142 6 months ago	259-84629 259 days ago	0-746 12 minutes
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	182-16187 6 months ago	182-75279 182 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	178-33563 5 months ago	236-50525 236 days ago	0-1600 26 minutes
29926	jcreinhold author:jcreinhold	feat(CategoryTheory/MarkovCategory): add basic finite stochastic matrices definitions to Markov category	This PR introduces FinStoch, the category of finite stochastic matrices, as a concrete example of a Markov category. This PR builds on #29925, #29939, and #29919 and was split up from #29657. ## Main additions ### 1. Core definitions (`FinStoch/Basic.lean`) - `StochasticMatrix m n`: Matrices where rows sum to 1, representing conditional probabilities P(j\|i) - `FinStoch`: The category with finite types as objects and stochastic matrices as morphisms - `DetMorphism`: Deterministic matrices (exactly one 1 per row) with their underlying functions - Composition: Matrix multiplication preserves row-stochasticity via the Chapman-Kolmogorov equation Key design choices: - Row-stochastic convention: entry (i,j) is P(output=j \| input=i) - Deterministic morphisms tracked separately for structural isomorphisms ### 2. Monoidal structure (`FinStoch/Monoidal.lean`) Implements tensor products modeling independent parallel processes: - Tensor on objects: Cartesian product of finite types - Tensor on morphisms: Kronecker product P((j₁,j₂)\|(i₁,i₂)) = P(j₁\|i₁) × P(j₂\|i₂) - Structural morphisms: Associator, unitors use deterministic permutations - Coherence**: Pentagon and triangle identities verified computationally ## Mathematical significance FinStoch provides the canonical example of a Markov category: - Morphisms: Stochastic matrices/Markov chains - Composition: Chapman-Kolmogorov equation for multi-step transitions - Tensor: Independent parallel processes This models finite probability spaces categorically, where: - Objects represent sample spaces - Morphisms represent probabilistic transitions - Tensor products model independence ## References Fritz (2020) - [ ] depends on: #29925	merge-conflict t-category-theory new-contributor	1437/0	Mathlib.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Basic.lean,Mathlib/CategoryTheory/CopyDiscardCategory/Deterministic.lean,Mathlib/CategoryTheory/MarkovCategory/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/Cartesian.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Basic.lean,Mathlib/CategoryTheory/MarkovCategory/FinStoch/Monoidal.lean,MathlibTest/CategoryTheory/MarkovCategory.lean,docs/references.bib	9	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	178-12961 5 months ago	unknown	0-0 0 seconds
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	178-11811 5 months ago	568-39360 568 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	178-3818 5 months ago	unknown	0-0 0 seconds
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']	nobody	177-79119 5 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	177-72323 5 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	177-16300 5 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	177-11781 5 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	176-79060 5 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	176-28689 5 months ago	176-55902 176 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	176-18022 5 months ago	176-18023 176 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	176-14760 5 months ago	186-2690 186 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	173-19598 5 months ago	271-80372 271 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	172-55954 5 months ago	172-55954 172 days ago	6-6533 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	172-51030 5 months ago	223-82827 223 days ago	0-1 1 second
29432	lecopivo author:lecopivo	feat: `data_synth` tactic to prove `HasFDerivAt 𝕜 f ?f' x` and similar	New tactic `data_synth` that can prove proposition with holes e.g. figure out what `?f'` is and prove `HasFDerivAt 𝕜 f ?f' x` --- Tactic `data_synth` is designed to synthesize some data that satisfies some proposition. The canonical example is `HasFDerivAt 𝕜 f ?f' x`, this tactic will figure out `f'` and provide proof of `HasFDerivAt 𝕜 f f' x`. Another examples: `HasBoundinbBall s ?center ?radius` or `IsPolynomial f ?p` ``` def HasBoundingBall (s : Set α) (center : α) (radius : ℝ) : Prop := s ⊆ Metric.closedBall center radius def IsPolynomial (f : R → R) (p : Polynomial R) := f = p.eval ```	WIP t-meta	1932/0	Mathlib/Tactic/DataSynth.lean,Mathlib/Tactic/DataSynth/Attr.lean,Mathlib/Tactic/DataSynth/Core.lean,Mathlib/Tactic/DataSynth/Decl.lean,Mathlib/Tactic/DataSynth/Elab.lean,Mathlib/Tactic/DataSynth/FDeriv.lean,Mathlib/Tactic/DataSynth/FDeriv/Basic.lean,Mathlib/Tactic/DataSynth/FDeriv/Dispatch.lean,Mathlib/Tactic/DataSynth/FDeriv/Init.lean,Mathlib/Tactic/DataSynth/FDeriv/Simproc.lean,Mathlib/Tactic/DataSynth/Tests/BoundingBall.lean,Mathlib/Tactic/DataSynth/Tests/Compilation.lean,Mathlib/Tactic/DataSynth/Tests/FDeriv.lean,Mathlib/Tactic/DataSynth/Tests/FDerivInit.lean,Mathlib/Tactic/DataSynth/Tests/FwdDeriv.lean,Mathlib/Tactic/DataSynth/Tests/Normalize.lean,Mathlib/Tactic/DataSynth/Tests/Polynomial.lean,Mathlib/Tactic/DataSynth/Theorems.lean,Mathlib/Tactic/DataSynth/ToBatteries.lean,Mathlib/Tactic/DataSynth/Types.lean	20	3	['JovanGerb', 'github-actions', 'lecopivo']	nobody	172-15948 5 months ago	210-36340 210 days ago	0-1834 30 minutes
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	172-3179 5 months ago	193-35269 193 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	170-44801 5 months ago	489-23297 489 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	170-38586 5 months ago	225-73431 225 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	169-53165 5 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	169-53164 5 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	169-12975 5 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	169-12974 5 months ago	unknown	0-0 0 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	168-22061 5 months ago	168-22061 168 days ago	8-8414 8 days
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	166-79755 5 months ago	166-79755 166 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	166-71993 5 months ago	166-71993 166 days ago	148-3338 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	166-17829 5 months ago	264-29811 264 days ago	0-89 1 minute
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	166-11382 5 months ago	264-37855 264 days ago	0-79 1 minute
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	165-61843 5 months ago	330-42964 330 days ago	0-47835 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	165-13132 5 months ago	248-17639 248 days ago	0-5675 1 hour
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	165-9025 5 months ago	165-9093 165 days ago	0-83 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	165-4515 5 months ago	213-4146 213 days ago	0-77704 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	162-39097 5 months ago	236-4922 236 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	160-41512 5 months ago	224-1685 224 days ago	2-31233 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	160-41464 5 months ago	176-16140 176 days ago	47-58551 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	160-33194 5 months ago	181-15823 181 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	160-33192 5 months ago	181-13692 181 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	160-12360 5 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	159-19034 5 months ago	244-35019 244 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	157-64029 5 months ago	202-4282 202 days ago	78-30158 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	157-36032 5 months ago	292-26834 292 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	157-24768 5 months ago	236-40303 236 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	157-21269 5 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	157-20572 5 months ago	165-80124 165 days ago	0-5460 1 hour
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	156-20522 5 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	154-32715 5 months ago	154-32715 154 days ago	41-53612 41 days
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/)	awaiting-author t-topology	368/1	Mathlib/Order/Lattice.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean	2	19	['ADedecker', 'github-actions', 'scholzhannah']	nobody	154-21696 5 months ago	154-21696 154 days ago	6-69092 6 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	154-20292 5 months ago	230-43188 230 days ago	47-20776 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	154-2693 5 months ago	200-64595 200 days ago	15-4939 15 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	153-85190 5 months ago	204-29140 204 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	153-52245 5 months ago	153-52245 153 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	152-81020 5 months ago	152-81021 152 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	152-68732 5 months ago	230-79278 230 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	152-48743 5 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	151-14424 5 months ago	192-46785 192 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	151-12513 5 months ago	272-13883 272 days ago	0-267 4 minutes
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	150-85673 4 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	150-84441 4 months ago	160-12520 160 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	150-70595 4 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	148-13851 4 months ago	229-6577 229 days ago	17-16247 17 days
14752	AntoineChambert-Loir author:AntoineChambert-Loir	fix(Topology/Algebra/Valued): repair definition of Valued	Following a [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Question.20about.20.60Valued.2Eis_topological_valuation.60), we modify the definition of the field `is_topological_valuation` of `Valued` insisting that the element $\gamma$ showing up there is in the subgroup generated by the image of the valuation map. Co-authored-by: @faenuccio - [x] depends on: #25496	merge-conflict WIP t-topology t-algebra label:t-algebra$	1166/301	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.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/UniformSpace/AbstractCompletion.lean,docs/references.bib	12	28	['AntoineChambert-Loir', 'faenuccio', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	nobody	147-1292 4 months ago	305-12173 305 days ago	1-33784 1 day
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	145-23224 4 months ago	145-23224 145 days ago	122-67006 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	144-61904 4 months ago	184-40570 184 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	144-4649 4 months ago	266-19246 266 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	143-34770 4 months ago	297-21050 297 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	143-16203 4 months ago	161-9022 161 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	142-4541 4 months ago	165-16018 165 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	140-61369 4 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	140-55019 4 months ago	143-24279 143 days ago	0-85235 23 hours
31596	grunweg author:grunweg	chore: remove extraneous uses of push_neg	--- Ideally, repeat this experiment after the new `contrapose!` for equivalences has been merged... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	155/99	Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/WellOrderContinuous.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Nat/Count.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/GroupTheory/Perm/ClosureSwap.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/Oka.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/Tactic/ByCases.lean,Mathlib/Tactic/ByContra.lean,Mathlib/Tactic/Contrapose.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Push.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Util/AtLocation.lean,MathlibTest/Contrapose.lean,MathlibTest/byContra.lean,MathlibTest/push_neg.lean	42	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	140-47309 4 months ago	144-17200 144 days ago	0-1 1 second
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	140-7765 4 months ago	140-7302 140 days ago	131-51649 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	139-79036 4 months ago	559-20024 559 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	139-62010 4 months ago	727-20176 727 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	139-26382 4 months ago	642-34374 642 days ago	168-78821 168 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/)	large-import merge-conflict file-removed awaiting-author t-meta	210277/112616	.github/PULL_REQUEST_TEMPLATE.md,.github/actionlint.yml,.github/build.in.yml,.github/workflows/PR_summary.yml,.github/workflows/actionlint.yml,.github/workflows/add_label_from_diff.yaml,.github/workflows/auto_assign_reviewers.yaml,.github/workflows/bench_summary_comment.yml,.github/workflows/bors.yml,.github/workflows/bot_fix_style.yaml,.github/workflows/build.yml,.github/workflows/build_fork.yml,.github/workflows/daily.yml,.github/workflows/discover-lean-pr-testing.yml,.github/workflows/docker_build.yml,.github/workflows/label_new_contributor.yml,.github/workflows/latest_import.yml,.github/workflows/lint_and_suggest_pr.yml,.github/workflows/long_file_report.yml,.github/workflows/maintainer_bors.yml,.github/workflows/maintainer_bors_wf_run.yml,.github/workflows/maintainer_merge.yml,.github/workflows/maintainer_merge_wf_run.yml,.github/workflows/mk_build_yml.sh,.github/workflows/nightly-docgen.yml,.github/workflows/nightly-regression-report.yml,.github/workflows/nightly_bump_toolchain.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/nightly_merge_master.yml,.github/workflows/nolints.yml,.github/workflows/pre-commit.yml,.github/workflows/remove_deprecated_decls.yml,.github/workflows/stale.yml,.github/workflows/technical_debt_metrics.yml,.github/workflows/update_dependencies.yml,.github/workflows/update_dependencies_zulip.yml,.github/workflows/weekly-lints.yml,.github/workflows/zulip_emoji_closed_pr.yaml,.github/workflows/zulip_emoji_labelling.yaml,.github/workflows/zulip_emoji_merge_delegate.yaml,.pre-commit-config.yaml,Archive.lean,Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Examples/IfNormalization/Statement.lean,Archive/Examples/IfNormalization/WithoutAesop.lean,Archive/Examples/Kuratowski.lean,Archive/Examples/MersennePrimes.lean,Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1961Q3.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1972Q5.lean,Archive/Imo/Imo1975Q1.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1982Q1.lean,Archive/Imo/Imo1982Q3.lean,Archive/Imo/Imo1987Q1.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/Imo2005Q3.lean,Archive/Imo/Imo2005Q4.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2015Q6.lean,Archive/Imo/Imo2019Q2.lean,Archive/Imo/Imo2021Q1.lean,Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/Imo/Imo2024Q6.lean,Archive/Imo/README.md,Archive/Kuratowski.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/HeronsFormula.lean,Archive/Wiedijk100Theorems/InverseTriangleSum.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/Wiedijk100Theorems/PerfectNumbers.lean,Archive/Wiedijk100Theorems/SolutionOfCubicQuartic.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Cache/IO.lean,Cache/Main.lean	5782	14	['Paul-Lez', 'Vierkantor', 'eric-wieser', 'github-actions', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	139-9449 4 months ago	256-26556 256 days ago	0-5960 1 hour
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	139-8877 4 months ago	484-58807 484 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	138-46737 4 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	138-46736 4 months ago	953-69598 953 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	138-46735 4 months ago	998-26396 998 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	138-46734 4 months ago	821-71629 821 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	138-46731 4 months ago	642-34362 642 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	138-46730 4 months ago	895-46506 895 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	138-46606 4 months ago	776-25055 776 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	138-46605 4 months ago	808-42776 808 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	138-46601 4 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	138-46600 4 months ago	587-22235 587 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	138-46599 4 months ago	669-15127 669 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	138-46475 4 months ago	600-80981 600 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	138-46474 4 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	138-46472 4 months ago	669-31850 669 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	138-46470 4 months ago	588-38556 588 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	138-46468 4 months ago	559-21604 559 days ago	26-40037 26 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	138-46345 4 months ago	630-11899 630 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	138-46343 4 months ago	627-80344 627 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	138-46341 4 months ago	625-5805 625 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	138-46340 4 months ago	614-31682 614 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	138-46339 4 months ago	614-12570 614 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	138-46337 4 months ago	600-38227 600 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	138-46335 4 months ago	456-81828 456 days ago	78-5771 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	138-46185 4 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	138-46184 4 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	138-46183 4 months ago	517-11586 517 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	138-46181 4 months ago	441-8741 441 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	138-46179 4 months ago	511-17513 511 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	138-46178 4 months ago	458-26408 458 days ago	43-17770 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	138-46177 4 months ago	450-17148 450 days ago	49-5112 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	138-46176 4 months ago	497-37352 497 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	138-46049 4 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	138-46048 4 months ago	472-69269 472 days ago	0-334 5 minutes
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	138-46046 4 months ago	434-19830 434 days ago	23-30991 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	138-46045 4 months ago	335-78974 335 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	138-46043 4 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	138-46042 4 months ago	426-19730 426 days ago	7-42229 7 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	138-46041 4 months ago	407-65800 407 days ago	27-38491 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	138-46039 4 months ago	439-14600 439 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	138-46037 4 months ago	357-47850 357 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	138-46035 4 months ago	430-82413 430 days ago	0-668 11 minutes
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	138-46031 4 months ago	363-60273 363 days ago	50-13773 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	138-46029 4 months ago	370-40704 370 days ago	46-53123 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	138-45905 4 months ago	365-29860 365 days ago	50-8745 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	138-45899 4 months ago	385-39912 385 days ago	20-81771 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	138-45896 4 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	138-45895 4 months ago	217-29176 217 days ago	158-38024 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	138-45893 4 months ago	406-62459 406 days ago	0-141 2 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	138-45892 4 months ago	406-62187 406 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	138-45890 4 months ago	404-79892 404 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	138-45886 4 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	138-45884 4 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	138-45883 4 months ago	138-45884 138 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	138-45877 4 months ago	366-60994 366 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	138-45875 4 months ago	367-24023 367 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	138-45873 4 months ago	312-59144 312 days ago	71-48538 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	138-45872 4 months ago	213-69679 213 days ago	0-4401 1 hour
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	138-45866 4 months ago	377-77997 377 days ago	0-21 21 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	138-45864 4 months ago	221-8236 221 days ago	65-54983 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	138-45862 4 months ago	357-415 357 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	138-45861 4 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	138-45859 4 months ago	239-56724 239 days ago	124-78303 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	138-45725 4 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	138-45724 4 months ago	224-44305 224 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	138-45719 4 months ago	304-63863 304 days ago	0-20349 5 hours
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	138-45714 4 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	138-45711 4 months ago	138-45712 138 days ago	177-42245 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	138-45706 4 months ago	188-65977 188 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	138-45579 4 months ago	302-30376 302 days ago	0-820 13 minutes
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	138-45576 4 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	138-45575 4 months ago	280-69138 280 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	138-45573 4 months ago	298-44826 298 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	138-45572 4 months ago	298-44465 298 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	138-45570 4 months ago	298-43557 298 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	138-45568 4 months ago	298-43662 298 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	138-45567 4 months ago	298-43308 298 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	138-45565 4 months ago	298-43119 298 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	138-45554 4 months ago	297-38200 297 days ago	0-410 6 minutes
25974	scholzhannah author:scholzhannah	feat(Topology/Compactness/CompactlyCoherentSpace): compact coherentification (k-ification)	This PR defines the notion of turning an arbitrary topological space into a compactly coherent space. Compactly coherent spaces are commonly referred to as "compactly generated spaces" or "k-spaces" in the literature while the operation of turning a space into such as space is called the "k-ification". There are however three different notions that are described with this name. To disambiguate we use the names "compactly coherent space" and "compactcoherentification" here. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation of these notions. This PR continues the work from #25318. Original PR: https://github.com/leanprover-community/mathlib4/pull/25318 Co-authored-by: Floris van Doorn	merge-conflict t-topology large-import	174/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	5	['github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'scholzhannah']	ADedecker assignee:ADedecker	138-45543 4 months ago	138-45544 138 days ago	147-64645 147 days
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	138-45542 4 months ago	293-79224 293 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	138-45539 4 months ago	293-79212 293 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 `variation μ = μ`. Co-authored-by: @yoh-tanimoto - [ ] depends on: #26160 --- [![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-measure-probability	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-45386 4 months ago	275-40341 275 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	138-45364 4 months ago	287-31594 287 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 merge-conflict awaiting-author t-analysis	468/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	3	21	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	138-45363 4 months ago	235-7353 235 days ago	44-77065 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	138-45359 4 months ago	286-42268 286 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	138-45346 4 months ago	160-34811 160 days ago	87-77407 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	138-45345 4 months ago	285-38487 285 days ago	0-1050 17 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	138-45344 4 months ago	284-35519 284 days ago	0-433 7 minutes
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	138-45215 4 months ago	254-2573 254 days ago	25-5689 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	138-45213 4 months ago	225-10076 225 days ago	40-48238 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	138-45212 4 months ago	274-47247 274 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	138-45210 4 months ago	167-34020 167 days ago	62-14616 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	138-45189 4 months ago	138-45190 138 days ago	133-24576 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	138-45188 4 months ago	271-47562 271 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	138-45178 4 months ago	269-33740 269 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	138-45175 4 months ago	250-1445 250 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	138-45173 4 months ago	265-32782 265 days ago	0-287 4 minutes
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	138-45172 4 months ago	139-76963 139 days ago	84-39534 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	138-45170 4 months ago	195-37734 195 days ago	3-71064 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	138-45039 4 months ago	244-35238 244 days ago	15-68804 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	138-45037 4 months ago	214-23324 214 days ago	18-86133 18 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	138-45018 4 months ago	249-16181 249 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	138-45017 4 months ago	153-5946 153 days ago	81-63204 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	138-45016 4 months ago	247-77243 247 days ago	0-5814 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	138-44890 4 months ago	192-56248 192 days ago	37-65699 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	138-44885 4 months ago	208-36116 208 days ago	23-24068 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	138-44884 4 months ago	138-44885 138 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	138-44878 4 months ago	217-75184 217 days ago	18-54732 18 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	138-44877 4 months ago	143-8760 143 days ago	93-44257 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	138-44874 4 months ago	145-36214 145 days ago	58-24605 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	138-44870 4 months ago	232-85098 232 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	138-44732 4 months ago	161-21315 161 days ago	0-7250 2 hours
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	138-44731 4 months ago	138-44732 138 days ago	71-37436 71 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	138-44724 4 months ago	216-10221 216 days ago	4-9284 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	138-44699 4 months ago	208-73015 208 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	138-44693 4 months ago	138-44694 138 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	4	['github-actions', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	138-44122 4 months ago	203-21855 203 days ago	0-93 1 minute
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	138-44115 4 months ago	202-23246 202 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	138-44101 4 months ago	195-83367 195 days ago	0-8980 2 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	138-44097 4 months ago	138-44098 138 days ago	54-85998 54 days
30004	luigi-massacci author:luigi-massacci	feat(MeasureTheory/Integral/TestAgainst): integrating BCFs against a finite measure or an L1Loc map as CLMs	This PR merges #29511 and #29748. Create a new file `TestAgainst.lean` with definitions wrapping integration against a finite measure or a locally integrable map as continuous linear maps on bounded continuous functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author t-analysis t-measure-probability	112/1	Mathlib.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/TestAgainst.lean	3	48	['EtienneC30', 'github-actions', 'j-loreaux', 'luigi-massacci', 'mathlib4-merge-conflict-bot']	EtienneC30 assignee:EtienneC30	138-44084 4 months ago	159-40783 159 days ago	31-57009 31 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	138-44083 4 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	138-44078 4 months ago	146-17475 146 days ago	23-51802 23 days
30230	CoolRmal author:CoolRmal	feat(MeasureTheory): Basic properties of the integral against a vector measure with a bilinear form.	Create a folder named Integral in the folder about vector measures. Define the integral of a function against a vector measure with a bilinear form, and prove that integral is a linear operator on functions, bilinear forms, and vector measures, respectively. Several useful lemmas are added into the file about variations of a vector measure (e.g. triangle inequality). --- - [ ] depends on: #28499 [![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-measure-probability	1353/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Integral/L1.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-43928 4 months ago	unknown	0-0 0 seconds
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	138-43920 4 months ago	161-21360 161 days ago	15-62894 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. - [ ] depends on: #31506 - [ ] 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	138-43901 4 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	138-43896 4 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	138-43588 4 months ago	159-71606 159 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	138-43388 4 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	138-43162 4 months ago	150-39930 150 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	138-40929 4 months ago	582-34043 582 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	138-39118 4 months ago	138-39119 138 days ago	11-62509 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	138-38822 4 months ago	143-80138 143 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	138-38779 4 months ago	140-55098 140 days ago	0-537 8 minutes
21915	YaelDillies author:YaelDillies	feat: simproc for `Int.divisorsAntidiag`	Co-authored-by: Paul Lezeau --- - [x] depends on: #21912 - [x] depends on: #21991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	75/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/DivisorsAntidiag.lean	3	9	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-32862 4 months ago	415-14843 415 days ago	0-56 56 seconds
15443	YaelDillies author:YaelDillies	feat: Marcinkiewicz-Zygmund inequality	Prove the Marcinkiewicz-Zygmund inequality. The Marcinkiewicz-Zygmund inequality states that, if `X₁, ..., Xₐ ∈ L^p` are independent random variables of mean zero valued in some inner product space, then the `L^p`-norm of `X₁ + ... + Xₐ` is at most `Cₚ` times the `L^(p/2)`-norm of `\|X₁\|² + ... + \|Xₐ\|²`, where `Cₚ` is a constant depending on `p` alone. From LeanAPAP Co-authored-by: Bhavik Mehta --- - [x] depends on: #15832 - [x] depends on: #21033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	189/0	Mathlib.lean,Mathlib/Probability/MarcinkiewiczZygmund.lean	2	40	['Parcly-Taxel', 'YaelDillies', 'b-mehta', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	138-32518 4 months ago	462-11425 462 days ago	89-28229 89 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	760/625	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Cache/Requests.lean,Counterexamples/PolynomialIsDomain.lean,Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Int/Even.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Group/Unbundled/Int.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/Algebra/Polynomial/Degree/IsMonicOfDegree.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Factors.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/SumIteratedDerivative.lean,Mathlib/Algebra/Ring/Action/Invariant.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/SpreadingOut.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/AlgebraicTopology/Quasicategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/Matrix/Spectrum.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Affine/Simplex.lean,Mathlib/Analysis/Normed/Field/UnitBall.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Kernels.lean,Mathlib/Analysis/Normed/Module/Ball/RadialEquiv.lean,Mathlib/Analysis/Normed/Ring/Ultra.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Quiver/Arborescence.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Computability/Primrec.lean,Mathlib/Control/Random.lean,Mathlib/Data/Char.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean	297	5	['JovanGerb', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	138-18730 4 months ago	144-30961 144 days ago	0-88 1 minute
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	138-18711 4 months ago	298-33875 298 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	138-18055 4 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	138-18047 4 months ago	950-73160 950 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	138-18042 4 months ago	808-22795 808 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	138-18010 4 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	138-17995 4 months ago	822-22973 822 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	138-17989 4 months ago	735-10295 735 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	138-17983 4 months ago	642-40792 642 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	138-17976 4 months ago	642-40775 642 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	138-17953 4 months ago	788-73097 788 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	138-17945 4 months ago	767-71790 767 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	138-17911 4 months ago	613-38193 613 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	138-17904 4 months ago	613-38068 613 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	138-17889 4 months ago	623-70436 623 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	138-17884 4 months ago	700-25935 700 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	138-17880 4 months ago	710-14160 710 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	138-17851 4 months ago	640-83732 640 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	138-17840 4 months ago	633-3847 633 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	138-17805 4 months ago	539-8265 539 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	138-17798 4 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	138-17792 4 months ago	501-24671 501 days ago	15-38473 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	138-17783 4 months ago	513-42135 513 days ago	0-722 12 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	138-17778 4 months ago	405-28738 405 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	138-17768 4 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	138-17729 4 months ago	474-34978 474 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	138-17702 4 months ago	430-82916 430 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	138-17690 4 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	138-17671 4 months ago	364-26922 364 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	138-17585 4 months ago	350-16520 350 days ago	8-27909 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	138-17581 4 months ago	221-45369 221 days ago	117-82649 117 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	138-17565 4 months ago	301-48020 301 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	138-17558 4 months ago	301-47982 301 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	138-17530 4 months ago	154-34982 154 days ago	80-45431 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	138-17404 4 months ago	283-73474 283 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	138-17357 4 months ago	274-68482 274 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	138-17345 4 months ago	272-42354 272 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	138-17323 4 months ago	230-14344 230 days ago	7-9588 7 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	138-17299 4 months ago	287-72413 287 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	138-17268 4 months ago	167-4403 167 days ago	74-62001 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	138-17247 4 months ago	238-56314 238 days ago	0-454 7 minutes
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	138-17195 4 months ago	182-8718 182 days ago	40-67698 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	138-17184 4 months ago	211-44369 211 days ago	5-6013 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	138-17143 4 months ago	208-6718 208 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	138-17136 4 months ago	205-18206 205 days ago	0-1063 17 minutes
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	138-17048 4 months ago	228-77951 228 days ago	0-581 9 minutes
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	138-17022 4 months ago	159-85586 159 days ago	3-59454 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	138-3444 4 months ago	138-3444 138 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	137-17409 4 months ago	195-8816 195 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). - [ ] depends on: #31508 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-meta	1824/6	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Tactic/Polynomial/Basic.lean,Mathlib/Tactic/Polynomial/Core.lean,Mathlib/Util/Qq.lean,MathlibTest/Algebra.lean,MathlibTest/Polynomial.lean,scripts/noshake.json	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	137-6591 4 months ago	146-12889 146 days ago	0-1388 23 minutes
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	t-algebra new-contributor label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	136-1754 4 months ago	136-906 136 days ago	0-1498 24 minutes
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	135-82533 4 months ago	250-8957 250 days ago	0-233 3 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	135-82529 4 months ago	268-40203 268 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	135-25593 4 months ago	135-25182 135 days ago	31-49241 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	134-78342 4 months ago	134-78342 134 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	134-22588 4 months ago	199-31388 199 days ago	29-55601 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	133-83777 4 months ago	134-834 134 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	133-76601 4 months ago	146-59580 146 days ago	37-80545 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	133-30323 4 months ago	138-45719 138 days ago	36-953 36 days
27756	grunweg author:grunweg	feat: `Weak(Pseudo)EMetricSpace`, generalises `(Pseudo)EMetricSpace`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology carleson	142/36	Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	133-15074 4 months ago	249-17442 249 days ago	0-2 2 seconds
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	132-74990 4 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	132-64112 4 months ago	354-72862 354 days ago	2-85335 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	132-46976 4 months ago	134-76061 134 days ago	13-10528 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	132-31448 4 months ago	132-31422 132 days ago	0-92 1 minute
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	132-31356 4 months ago	132-31397 132 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	131-59635 4 months ago	132-28647 132 days ago	6-25774 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	131-58807 4 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	131-55421 4 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	131-24913 4 months ago	131-24913 131 days ago	64-6237 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	131-13889 4 months ago	291-44123 291 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	131-13385 4 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	130-84615 4 months ago	140-72797 140 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	130-75150 4 months ago	130-75151 130 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	130-42601 4 months ago	284-27178 284 days ago	0-189 3 minutes
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	130-33131 4 months ago	281-73009 281 days ago	58-34020 58 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	129-46015 4 months ago	129-46015 129 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	129-15549 4 months ago	238-17462 238 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	129-6674 4 months ago	193-15077 193 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	128-85780 4 months ago	150-40045 150 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	128-83556 4 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	128-41439 4 months ago	285-62354 285 days ago	0-69 1 minute
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	125-12977 4 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	125-12112 4 months ago	135-17062 135 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	124-84786 4 months ago	882-31571 882 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	124-83644 4 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	124-26628 4 months ago	252-42428 252 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	124-19858 4 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	123-23745 4 months ago	190-22399 190 days ago	25-3098 25 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	131/0	Mathlib.lean,Mathlib/Lean/Syntax.lean,Mathlib/Util/DeclarationManipulation.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	122-59676 4 months ago	122-59625 122 days ago	2-29765 2 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	122-22725 4 months ago	122-20982 122 days ago	0-2143 35 minutes
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	122-17992 4 months ago	134-71205 134 days ago	0-34649 9 hours
31597	grunweg author:grunweg	chore(AtLocation): allow throwing a warning when no progress is being made	A future PR will use this to make `by_contra!` and friends warn if the `push_neg` step makes no progress. Co-authored by: Jovan Gerbscheid --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-meta merge-conflict	46/28	Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/ReduceModChar.lean,Mathlib/Tactic/Ring/RingNF.lean,Mathlib/Util/AtLocation.lean,MathlibTest/FieldSimp.lean,MathlibTest/abel.lean	10	7	['JovanGerb', 'fpvandoorn', 'github-actions', 'mathlib4-merge-conflict-bot', 'thorimur']	thorimur assignee:thorimur	122-15261 4 months ago	136-12766 136 days ago	7-68323 7 days
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	122-4754 4 months ago	130-48297 130 days ago	39-49182 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	122-4630 4 months ago	131-27056 131 days ago	16-82714 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	122-232 4 months ago	304-26576 304 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	121-66260 4 months ago	198-81968 198 days ago	44-10271 44 days
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	120-65819 3 months ago	unknown	0-0 0 seconds
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 - [x] depends on: #18534 - [x] depends on: #18527 - [x] depends on: #18440 - [ ] 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	120-21092 3 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	119-25465 3 months ago	119-25465 119 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	119-18538 3 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	119-18536 3 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	119-18536 3 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	118-59914 3 months ago	unknown	0-0 0 seconds
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	117-82177 3 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	117-25622 3 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	629/0	Mathlib.lean,Mathlib/Data/QuotType.lean,MathlibTest/QuotType.lean	3	20	['YaelDillies', 'astrainfinita', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	116-86157 3 months ago	169-55010 169 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	116-76901 3 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	116-38697 3 months ago	164-41231 164 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	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	9	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	116-30995 3 months ago	165-43658 165 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', 'leanprover-community-mathlib4-bot']	nobody	116-19392 3 months ago	963-3734 963 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	115-72882 3 months ago	225-11928 225 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	115-35173 3 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	113-17571 3 months ago	113-17571 113 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	111-85898 3 months ago	129-21400 129 days ago	0-309 5 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	111-80019 3 months ago	119-2812 119 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	111-76896 3 months ago	133-26445 133 days ago	60-67125 60 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	111-38258 3 months ago	112-40338 112 days ago	2-53608 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	110-57121 3 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	110-31621 3 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	110-2633 3 months ago	142-15750 142 days ago	0-9721 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	110-2632 3 months ago	117-1259 117 days ago	0-16600 4 hours
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	109-83886 3 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	109-43557 3 months ago	422-82127 422 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	108-40973 3 months ago	108-41013 108 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	108-32958 3 months ago	108-33015 108 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	108-22635 3 months ago	151-8336 151 days ago	2-14235 2 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	107-75742 3 months ago	107-75742 107 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	107-21539 3 months ago	166-72507 166 days ago	54-75088 54 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	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	106-21029 3 months ago	unknown	0-0 0 seconds
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	31	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'urkud']	sgouezel assignee:sgouezel	105-43962 3 months ago	111-1880 111 days ago	98-51478 98 days
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	104-65939 3 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	104-54204 3 months ago	104-59489 104 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	104-54096 3 months ago	104-59263 104 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	104-54012 3 months ago	104-59075 104 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	104-51684 3 months ago	104-51685 104 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	104-51682 3 months ago	104-51683 104 days ago	0-1431 23 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	104-51681 3 months ago	104-51682 104 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	104-51679 3 months ago	104-51680 104 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	104-51676 3 months ago	104-51679 104 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	104-51675 3 months ago	104-51676 104 days ago	0-2387 39 minutes
33178	gw90 author:gw90	feat(Analysis/CStarAlgebra/Spectrum): Adding lemmas that the CStarAlgebra norm equals the square root of the spectral radius of star a * a	Adds lemmas that the \|\|a\|\|^2_A=sqrt(spectralRadius C (star a * a)). I think it would be helpful to have these lemmas available in Mathlib. It'll help with some of the other things I'm working on. Feel free to move them to a different file or rename them as you see fit.	new-contributor t-analysis awaiting-author	24/0	Mathlib/Analysis/CStarAlgebra/Spectrum.lean	1	15	['github-actions', 'gw90', 'themathqueen', 'vihdzp']	nobody	104-3543 3 months ago	105-65562 105 days ago	0-15209 4 hours
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	102-53587 3 months ago	102-53628 102 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	101-80916 3 months ago	101-80916 101 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	101-25428 3 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	101-5373 3 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	101-5270 3 months ago	1030-76400 1030 days ago	0-753 12 minutes
6042	MohanadAhmed author:MohanadAhmed	feat(LinearAlgebra/Matrix/SVD): Singular Value Decomposition of R or C Matrices	This file provides proves the SVD theorem which decomposes a real/complex matrix into left eigenvectors, singular values block diagonal matrix and right eigenvectors. Any matrix A (M × N) with rank r = A.rank and with elements in ℝ or ℂ fields can be decompsed into the product of three matrices: $$A = USV$$ * The three matrices are defined as - $U$: an M × M matrix containing the left eigenvectors of the matrix - $S$: an M × N matrix with an r × r block in the upper left corner with nonzero singular values - $V$: an N × N matrix containing the right eigenvectors of the matrix Note that * $S$ is a block matrix $S = [S₁₁, S₁₂; S₂₁, S₂₂]$ with - $S₁₁$: a diagonal r × r matrix and - $S₁₂$ : r × (N - r) zero matrix, S₂₁ : (M - r) × r zero matrix and - $S₂₂$: (M - r) × (N - r) zero matrix * $U$ is a block column matrix U = [U₁ U₂] with - $U₁$ : a M × r containing left eigenvectors with nonzero singular values. - $U₂$ : a M × (M - r) containing left eigenvectors with zero singular values. * $V$ is a block column matrix V = [V₁ V₂] with - $V₁$ : a N × r containing right eigenvectors with nonzero singular values. - $V₂$ : a M × (M - r) containing right eigenvectors with zero singular values. Since in mathlib the eigenvalues of hermitian matrices are defined in an "arbitrary" undetermined order, we begin by partition the singular values into zero and non-zero values. We partition the corresponding eigenvectors from AᴴA and AAᴴ using similar rearrangements. These are included in `SVD.svdReindex`. The basic API for Column and Row partitioned matrices is from `ColumnRowPartitioned`. We then proceed to transfer some of the lemmas we need about eigenvector matrices (for example that they are unitary: i.e. inverse is conjugate transpose.). Note that since invertibility in mathlib is defined for square matrices while our matrices are partitioned i.e. N × (N₁ ⊕ N₂) and N ≃ (N ⊕ N₂), Lean cannot apply the Invertible definition. We workaround this were necessary. Lemma `reduced_spectral_theorem` (`reduced_spectral_theorem'`) shows that AᴴA and AAᴴ, can be reduced to products containing only the non-zero singular eigenvectors. This is later used in proving the main SVD theroem. A few lemmas are provided about the invertibility of the non-zero singular values matrix: `svdσ_inv`, `σ_inv_μ_σ_inv_eq_one`, `IsUnit_det_svdσ`, `IsUnit_det_svdσ_mapK` and `svdσ_inv_mapK`. To make relating left eigenvectors to right eigenvectors easier we define U₁ = AV₁σ⁻¹ while U₂ is obtained from the eigenvectors of (AAᴴ). This avoid a lengthy reindexing operation with many proofs. The vectors in U₂ have no such issue since they are multiplied by zero singular values anyway. Co-authored-by: Mohanad Ahmed --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP t-algebra merge-conflict label:t-algebra$	588/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean	3	116	['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'vihdzp']	nobody	101-4900 3 months ago	783-5188 783 days ago	197-21527 197 days
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	101-1245 3 months ago	1044-21086 1044 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	100-80161 3 months ago	123-83618 123 days ago	3-49892 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	100-71378 3 months ago	249-18603 249 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	100-29341 3 months ago	112-4631 112 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` --- - [ ] depends on: #21031 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author blocked-by-other-PR merge-conflict 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', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	100-22869 3 months ago	109-83816 109 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	100-10413 3 months ago	100-10413 100 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	100-3363 3 months ago	100-3363 100 days ago	5-82139 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	8	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	99-16490 3 months ago	248-25641 248 days ago	56-85445 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	98-66061 3 months ago	629-81465 629 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	98-53469 3 months ago	204-77527 204 days ago	0-6833 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	98-12267 3 months ago	160-13475 160 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	98-9664 3 months ago	unknown	0-0 0 seconds
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	96-53302 3 months ago	98-21782 98 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	95-45882 3 months ago	unknown	0-0 0 seconds
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	94-83630 3 months ago	95-10544 95 days ago	0-121 2 minutes
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). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	187/0	Mathlib.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/IsSmall.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Presheaf.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean	5	6	['github-actions', 'joelriou', 'robin-carlier']	nobody	94-40463 3 months ago	94-40463 94 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	94-34524 3 months ago	114-32265 114 days ago	0-157 2 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	94-31554 3 months ago	94-31554 94 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	93-84898 3 months ago	105-33329 105 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	93-68532 3 months ago	181-17551 181 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	93-68484 3 months ago	221-12597 221 days ago	43-1605 43 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	93-68470 3 months ago	181-21267 181 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	93-68442 3 months ago	133-30358 133 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	93-60394 3 months ago	185-72719 185 days ago	9-26430 9 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	93-38277 3 months ago	108-85008 108 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	92-84878 3 months ago	92-84879 92 days ago	0-60133 16 hours
28013	astrainfinita author:astrainfinita	feat: Lindemann-Weierstrass Theorem	This PR continues the work from #6718. -------- - [x] depends on: #18693 - [x] depends on: #29121	t-algebra t-analysis awaiting-author merge-conflict label:t-algebra$	1106/55	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/Polynomial/Factors.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Indicator.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	12	15	['astrainfinita', 'github-actions', 'grunweg', 'j-loreaux', 'jcommelin', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	91-85285 3 months ago	140-81892 140 days ago	3-86310 3 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	91-80461 3 months ago	426-76984 426 days ago	0-2312 38 minutes
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	91-77305 3 months ago	94-26758 94 days ago	13-49137 13 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	242/25	Mathlib.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/ModularForms/LFunction.lean	4	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	91-26699 3 months ago	155-17326 155 days ago	0-1 1 second
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	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	9	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	91-11897 3 months ago	179-18193 179 days ago	0-2073 34 minutes
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	91-9644 3 months ago	201-31354 201 days ago	3-79180 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	91-1476 3 months ago	538-48713 538 days ago	9-73631 9 days
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	90-63428 3 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	90-30954 3 months ago	90-69304 90 days ago	0-83 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	90-1305 3 months ago	90-1305 90 days ago	4-44581 4 days
13740	YaelDillies author:YaelDillies	feat: more robust ae notation	Make sure that, when `μ : FiniteMeasure Ω`, `f =ᵐ[μ] g` elaborates to `f =ᵐ[↑μ] g` instead of complaining about `OuterMeasureClass (FiniteMeasure Ω) (Set Ω) ℝ≥0∞` not existing. [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/ae.20of.20a.20finite.20measure) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta t-measure-probability awaiting-author	67/8	Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/OuterMeasure/BorelCantelli.lean,Mathlib/Probability/Notation.lean	6	41	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'thorimur', 'urkud']	RemyDegenne and thorimur assignee:RemyDegenne assignee:thorimur	90-597 3 months ago	90-649 90 days ago	62-16320 62 days
32165	yuanyi-350 author:yuanyi-350	feat(Real/Trigonometric): Add `sum_cos_arith_progression` and prepare for Dirichlet kernel	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict	68/0	Mathlib.lean,Mathlib/Analysis/Fourier/DirichletKernel.lean	2	8	['BoltonBailey', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud', 'yuanyi-350']	fpvandoorn assignee:fpvandoorn	89-76169 2 months ago	126-62951 126 days ago	3-74302 3 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	89-54470 2 months ago	90-14803 90 days ago	7-33574 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	89-54345 2 months ago	95-46178 95 days ago	0-1262 21 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	6/17	Mathlib/Data/Finsupp/Indicator.lean	1	1	['github-actions']	nobody	89-23435 2 months ago	89-1516 89 days ago	4-46258 4 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	89-11317 2 months ago	90-4066 90 days ago	1-85838 1 day
33561	kbuzzard author:kbuzzard	chore: cont -> continuous_toFun	This field is sometimes called `cont` and sometimes `continuous_toFun`. I noticed that the `continuity` tactic sometimes takes a lot longer to prove `cont` even if `continuous_toFun` is available so I thought I'd change them all to see if this speed up mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	171/149	Mathlib/Algebra/Category/ContinuousCohomology/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Homology.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Polynomial.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/NonUnital.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Extend.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/DerivNotation.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/LpSpace.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/LocallyConvex/Barrelled.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/RCLike/Extend.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/TwoVariable.lean,Mathlib/Probability/Distributions/Fernique.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Topology/Algebra/AffineSubspace.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ContinuousAffineMap.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.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/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/Star.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/ContinuousMap/Algebra.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/VectorBundle/Basic.lean	66	5	['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib4-merge-conflict-bot']	nobody	88-78971 2 months ago	88-78972 88 days ago	2-81715 2 days
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	88-76654 2 months ago	254-33060 254 days ago	0-2 2 seconds
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	5	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	88-73651 2 months ago	222-39841 222 days ago	0-2565 42 minutes
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	88-26106 2 months ago	358-1151 358 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	88-19976 2 months ago	unknown	0-0 0 seconds
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	88-14816 2 months ago	153-19385 153 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	88-14815 2 months ago	172-14555 172 days ago	0-345 5 minutes
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	88-11782 2 months ago	88-11782 88 days ago	13-42146 13 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	86-78726 2 months ago	155-68269 155 days ago	0-1291 21 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	86-78240 2 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	86-78114 2 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	86-75199 2 months ago	161-22184 161 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	86-43831 2 months ago	90-9359 90 days ago	0-3399 56 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	85-76769 2 months ago	212-18748 212 days ago	82-7527 82 days
25907	mans0954 author:mans0954	feat: low order roots of unity	This PR continues the work from #25470. Original PR: https://github.com/leanprover-community/mathlib4/pull/25470	t-algebra please-adopt label:t-algebra$	182/0	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean	2	3	['github-actions', 'mans0954', 'urkud']	jcommelin assignee:jcommelin	85-76752 2 months ago	138-3937 138 days ago	157-25048 157 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	85-76730 2 months ago	286-46779 286 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	85-76714 2 months ago	277-82376 277 days ago	0-4698 1 hour
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	85-76706 2 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	85-76483 2 months ago	286-47381 286 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	85-76476 2 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	85-71279 2 months ago	286-46007 286 days ago	0-562 9 minutes
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	85-71260 2 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	85-71256 2 months ago	138-45354 138 days ago	142-46248 142 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	85-71212 2 months ago	281-3157 281 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	85-71203 2 months ago	286-46098 286 days ago	0-72 1 minute
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	85-71170 2 months ago	183-9027 183 days ago	0-23671 6 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	85-71137 2 months ago	138-44091 138 days ago	41-47583 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	85-71118 2 months ago	212-8409 212 days ago	0-645 10 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	85-70974 2 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	85-70958 2 months ago	173-60859 173 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	85-70699 2 months ago	unknown	0-0 0 seconds
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	['leanprover-community-mathlib4-bot', 'urkud']	nobody	84-58277 2 months ago	669-32345 669 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	84-58184 2 months ago	689-27609 689 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	84-58061 2 months ago	224-2247 224 days ago	18-39479 18 days
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	84-18668 2 months ago	221-8517 221 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	28	['0xTerencePrime', 'ADedecker', 'github-actions', 'j-loreaux']	ADedecker assignee:ADedecker	84-4550 2 months ago	84-4771 84 days ago	22-22665 22 days
33435	astrainfinita author:astrainfinita	feat: algebra automorphisms of monoid algebras	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	53/3	Mathlib/Algebra/MonoidAlgebra/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	83-2484 2 months ago	83-2485 83 days ago	13-16290 13 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	82-82438 2 months ago	86-41661 86 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	82-55535 2 months ago	82-52163 82 days ago	0-3444 57 minutes
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	1340/5	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	11	13	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	82-44552 2 months ago	287-42956 287 days ago	0-2 2 seconds
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	82-18590 2 months ago	171-11696 171 days ago	12-76087 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	82-15899 2 months ago	87-89 87 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	82-10193 2 months ago	138-44129 138 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)` (the proof of this is ugly). --- - [x] depends on: #27567 - [x] depends on: #27569 - [ ] 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/Coalgebra/Frobenius.lean	2	19	['YaelDillies', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	alreadydone assignee:alreadydone	81-79759 2 months ago	128-12125 128 days ago	28-31303 28 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`). --- - [ ] depends on: #30666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra blocked-by-other-PR label:t-algebra$	101/0	Mathlib/NumberTheory/NumberField/ExistsRamified.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	81-38723 2 months ago	81-38742 81 days ago	0-47 47 seconds
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	81-22047 2 months ago	124-39480 124 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	81-1918 2 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 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	4	['chrisflav', 'erdOne', 'github-actions', 'robin-carlier']	eric-wieser assignee:eric-wieser	80-78458 2 months ago	81-20161 81 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	80-60402 2 months ago	230-40777 230 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	80-22881 2 months ago	80-31403 80 days ago	93-10641 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	80-21348 2 months ago	80-21349 80 days ago	27-6197 27 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	80-17078 2 months ago	150-23550 150 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	80-7008 2 months ago	563-57277 563 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	78-32961 2 months ago	215-64745 215 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	78-32917 2 months ago	180-37821 180 days ago	25-78230 25 days
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	78-9108 2 months ago	224-10522 224 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	78-8862 2 months ago	175-27092 175 days ago	0-13 13 seconds
34132	Paul-Lez author:Paul-Lez	feat(Analysis/PDE/Quasilinear/Defs): Add definitions about quasilinear first order PDEs	This PR continues the work from #25429. Original PR: https://github.com/leanprover-community/mathlib4/pull/25429	t-analysis	147/0	Mathlib.lean,Mathlib/Analysis/PDE/Quasilinear/Defs.lean	2	1	['github-actions']	nobody	77-29548 2 months ago	unknown	0-0 0 seconds
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	76-32765 2 months ago	77-29610 77 days ago	0-348 5 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 blocked-by-other-PR merge-conflict new-contributor	160/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	8	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	76-12346 2 months ago	84-26170 84 days ago	10-38484 10 days
32546	anishrajeev author:anishrajeev	feat(ModelTheory): Prove compactness of the type space	Define the space of types and prove various topological properties of it (zero dimensional, totally separated, compact, baire). The goal is to formalize the proof of the Omitting Types Theorem - [ ] depends on: #32215	merge-conflict t-logic new-contributor	127/1	Mathlib.lean,Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	6	['NoneMore', 'anishrajeev', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	fpvandoorn assignee:fpvandoorn	76-12296 2 months ago	116-14992 116 days ago	3-84208 3 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	75-67463 2 months ago	122-19836 122 days ago	41-5126 41 days
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	74-33631 2 months ago	74-33631 74 days ago	0-45401 12 hours
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 label:t-algebra$	4/0	Mathlib/Algebra/Order/Group/Defs.lean	1	8	['Garmelon', 'Vierkantor', 'artie2000', 'github-actions', 'leanprover-radar']	eric-wieser assignee:eric-wieser	74-16905 2 months ago	74-16905 74 days ago	40-42357 40 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	74-16104 2 months ago	75-83940 75 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	74-12141 2 months ago	147-63586 147 days ago	74-62390 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	74-3967 2 months ago	unknown	0-0 0 seconds
34129	idontgetoutmuch author:idontgetoutmuch	feat: define Ehresmann connections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-differential-geometry new-contributor	90/0	Mathlib.lean,Mathlib/Geometry/Manifold/EhresmannConnection.lean	2	5	['github-actions', 'grunweg', 'idontgetoutmuch', 'metakunt']	nobody	73-37654 2 months ago	77-16540 77 days ago	0-1188 19 minutes
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	73-34412 2 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	72-24522 2 months ago	72-28607 72 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	71-47487 2 months ago	75-15092 75 days ago	0-278 4 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	71-3750 2 months ago	unknown	0-0 0 seconds
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	70-37181 2 months ago	unknown	0-0 0 seconds
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	70-20975 2 months ago	130-29777 130 days ago	6-17372 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', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	69-84851 2 months ago	690-85845 690 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	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	2	['eric-wieser', 'github-actions']	nobody	69-12787 2 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	69-8629 2 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	68-82456 2 months ago	107-79744 107 days ago	0-5 5 seconds
34361	grunweg author:grunweg	chore: rename comp' to fun_comp a few more times; use to_fun to autog…	…enerate -------- - [ ] 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 blocked-by-other-PR	24/40	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	68-79355 2 months ago	68-82112 68 days ago	3-29244 3 days
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	68-71729 2 months ago	unknown	0-0 0 seconds
34506	kbuzzard author:kbuzzard	perf(RingTheory/Extension/Generators): universe switch	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory	1/1	Mathlib/RingTheory/Extension/Generators.lean	1	3	['github-actions', 'kbuzzard', 'leanprover-radar']	nobody	68-68449 2 months ago	68-69666 68 days ago	0-1 1 second
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	68-972 2 months ago	243-76628 243 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	67-84602 2 months ago	129-15167 129 days ago	8-14810 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	101/2	Mathlib/NumberTheory/Divisors.lean	1	37	['MichaelStollBayreuth', 'github-actions', 'mathlib4-merge-conflict-bot', 'upobir']	mariainesdff assignee:mariainesdff	67-50925 2 months ago	245-22127 245 days ago	45-82692 45 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	67-36322 2 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	531/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Partition/EulerComb.lean	2	5	['chiyunhsu', 'github-actions', 'tb65536', 'vihdzp']	b-mehta assignee:b-mehta	67-21723 2 months ago	67-21723 67 days ago	42-22427 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	67-20369 2 months ago	235-74478 235 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	67-10970 2 months ago	67-11131 67 days ago	3-27377 3 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	66-85812 2 months ago	67-20276 67 days ago	0-22 22 seconds
34279	grunweg author:grunweg	chore: use `to_fun` more	We use the new functionality of `to_fun` from #34257 to remove a few more duplicate lemmas. --- - [ ] depends on: #34257 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	89/217	Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Tactic/ToFun.lean	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-81596 2 months ago	73-80522 73 days ago	0-441 7 minutes
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	66-44130 2 months ago	75-28145 75 days ago	2-6824 2 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	66-1665 2 months ago	107-73632 107 days ago	0-7673 2 hours
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/)	merge-conflict	1579/120	Mathlib.lean,Mathlib/Analysis/Asymptotics/TVS.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,Mathlib/Analysis/Complex/RiemannMapping.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UnitDisc/Shift.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/Algebra/Group/CompactOpen.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/MetricSpace/Algebra.lean,Mathlib/Topology/UniformSpace/LocallyUniformConvergence.lean	16	8	['SnirBroshi', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	66-1539 2 months ago	unknown	0-0 0 seconds
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	66-1414 2 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	65-83648 2 months ago	65-83299 65 days ago	0-11705 3 hours
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	65-61116 2 months ago	275-59340 275 days ago	72-50365 72 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	65-46979 2 months ago	unknown	0-0 0 seconds
34257	grunweg author:grunweg	feat(Tactic/ToFun): allow configuring the name of the generated declaration	This allows removing a few more duplicate lemmas. A few of these lemmas were misnamed (i.e., not using the `fun_` naming convention): we correct this. --- I'm also happy to split the follow-up golfs into a separate PR, if preferred. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict	31/53	Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/Deriv/Pow.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Pow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Tactic/ToFun.lean	8	12	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	65-45926 2 months ago	73-32500 73 days ago	0-52192 14 hours
34106	ADedecker author:ADedecker	feat: map a seminorm along a surjective linear map	--- - [ ] depends on: #34105 - [ ] depends on: #34104 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	65-13359 2 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	64-81935 2 months ago	118-82373 118 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	64-81139 2 months ago	190-66724 190 days ago	0-24009 6 hours
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	64-81012 2 months ago	199-69424 199 days ago	0-1375 22 minutes
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	64-80916 2 months ago	355-72148 355 days ago	0-1017 16 minutes
34675	YaelDillies author:YaelDillies	feat: comultiplication as a bialgebra hom	From Toric --- - [ ] depends on: #32245 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR toric	880/3	Mathlib.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean,Mathlib/RingTheory/Coalgebra/CoassocSimps.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/Tactic/Attr/Register.lean,MathlibTest/RingTheory/CoassocSimps.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	64-36145 2 months ago	64-37228 64 days ago	0-1 1 second
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	64-34379 2 months ago	164-24082 164 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	64-34366 2 months ago	182-71335 182 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	64-34359 2 months ago	182-76988 182 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	64-34278 2 months ago	199-66847 199 days ago	0-2878 47 minutes
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	8	['Hagb', 'Vierkantor', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	64-34231 2 months ago	114-57735 114 days ago	0-137 2 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	4/0	Mathlib/MeasureTheory/Constructions/Polish/Basic.lean	1	9	['ADedecker', 'LTolDe', 'dupuisf', 'github-actions', 'jcommelin']	PatrickMassot assignee:PatrickMassot	64-34133 2 months ago	90-18265 90 days ago	11-7507 11 days
24000	YaelDillies author:YaelDillies	feat: correspondence between affine group schemes and Hopf algebras	Construct `Spec` as a functor from `R`-Hopf algebras to group schemes over `Spec R`, show it is full and faithful and has affine group schemes as essential image. From Toric, FLT Co-authored-by: Andrew Yang Co-authored-by: Michał Mrugała Co-authored-by: Christian Merten --- - [ ] depends on: #34675 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry toric FLT blocked-by-other-PR	127/0	Mathlib/AlgebraicGeometry/GroupScheme/HopfAffine.lean	1	4	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot']	nobody	64-33296 2 months ago	358-29429 358 days ago	0-1 1 second
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	64-26198 2 months ago	125-84442 125 days ago	0-1609 26 minutes
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	64-26074 2 months ago	161-17520 161 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	64-25835 2 months ago	118-67678 118 days ago	0-27628 7 hours
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	64-25684 2 months ago	206-2841 206 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	64-25667 2 months ago	275-58166 275 days ago	29-66856 29 days
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	64-25610 2 months ago	81-40295 81 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	64-25354 2 months ago	157-7369 157 days ago	0-64677 17 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	64-24841 2 months ago	139-68044 139 days ago	0-150 2 minutes
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	186/1	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	5	['NickAdfor', 'github-actions', 'jcommelin']	kmill assignee:kmill	64-24573 2 months ago	66-25470 66 days ago	26-1427 26 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	63-82552 2 months ago	69-64210 69 days ago	0-784 13 minutes
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	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	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	63-37881 2 months ago	160-23198 160 days ago	0-2 2 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	62-3111 2 months ago	132-34451 132 days ago	19-82118 19 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	62-3102 2 months ago	81-26786 81 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	62-3094 2 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	61-83001 2 months ago	61-83001 61 days ago	10-7491 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	61-62270 2 months ago	62-12723 62 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	61-39983 2 months ago	91-23846 91 days ago	0-412 6 minutes
19860	YaelDillies author:YaelDillies	refactor: review the `simps` projections of `OneHom`, `MulHom`, `MonoidHom`	Make `simps` generate `coe_concreteHom` rather than`concreteHom_apply`. From FLT --- In fact, I would love to have both the `coe_` and `_apply` projections simultaneously and also to not have to specify ` simps (config := .asFn))` every single time we want to generate the `coe_` projection, but `simps ` seems to not be able to do that? cc @fpvandoorn I must say, after four years of working on mathlib, I still don't understand how one is supposed to use `simps`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	100/123	Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/End.lean,Mathlib/GroupTheory/NoncommCoprod.lean	8	12	['fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	61-17162 2 months ago	482-33725 482 days ago	0-17 17 seconds
21031	YaelDillies author:YaelDillies	chore: get rid of generic hom coercions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	166/161	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean	12	18	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'urkud']	Vierkantor assignee:Vierkantor	61-17075 2 months ago	437-967 437 days ago	0-17 17 seconds
34148	FLDutchmann author:FLDutchmann	feat: refactor `ring` to extract common behaviour with `algebra`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	2489/1107	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Common.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/Algebra.lean,MathlibTest/ring.lean,scripts/noshake.json	11	6	['FLDutchmann', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	60-57213 2 months ago	unknown	0-0 0 seconds
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	60-42673 2 months ago	96-14303 96 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	60-34010 2 months ago	60-34010 60 days ago	7-50691 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	60-24970 2 months ago	60-24970 60 days ago	20-17046 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	59-85408 2 months ago	63-17148 63 days ago	0-2854 47 minutes
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	59-43982 2 months ago	60-14972 60 days ago	85-51732 85 days
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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra t-group-theory label:t-algebra$	23/0	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Map.lean	2	3	['CoolRmal', 'github-actions']	nobody	59-42508 2 months ago	59-42556 59 days ago	0-36 36 seconds
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/Order/Birkhoff.lean,Mathlib/Order/Quotient.lean	5	28	['Vierkantor', 'alreadydone', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vihdzp', 'wwylele']	nobody	59-34058 2 months ago	59-34060 59 days ago	25-9099 25 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	59-32345 2 months ago	59-32345 59 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	58-78692 1 month 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	58-77660 1 month ago	87-35934 87 days ago	26-54054 26 days
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	41	['Vierkantor', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-radar', 'mattrobball']	chrisflav assignee:chrisflav	58-4875 1 month ago	58-4917 58 days ago	8-42588 8 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	57-68584 1 month ago	57-68584 57 days ago	35-16104 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	57-64296 1 month ago	57-64296 57 days ago	23-8390 23 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	56-38570 1 month ago	275-61811 275 days ago	52-61657 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	56-10293 1 month ago	136-20064 136 days ago	113-64892 113 days
34720	Paul-Lez author:Paul-Lez	feat(RingTheory/PowerSeries/Composition): define composition of power series	This PR defines the composition of two power series, and adds various pieces of API lemmas (this is mostly fixing up and upstreaming code from [this repo](https://github.com/rmhi/formal_deriv)). This is the first of a series of PRs upstreaming work that was done at the CFT workshop in Oxford last summer, working towards proving some results about the `exp` and `log` power series (and their composition!), and constructing the isomorphism $(\mathfrak{m}_K ^ n, +) \cong (1 + \mathfrak{m}_K ^ n, \times)$ for sufficiently large $n$, where $K$ is a characteristic zero local field. Co-authored-by: Richard Hill Co-authored-by: Calle Sönne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-zulip	844/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Composition.lean	2	3	['Paul-Lez', 'github-actions', 'vihdzp']	nobody	55-80142 1 month ago	63-32062 63 days ago	0-10 10 seconds
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	55-31151 1 month ago	496-19419 496 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	55-17058 1 month ago	88-39926 88 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	54-84449 1 month ago	301-48007 301 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 - [ ] depends on: #26165 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR new-contributor t-measure-probability merge-conflict	916/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	5	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	54-84447 1 month ago	275-40314 275 days ago	15-65390 15 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	54-56822 1 month 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	54-49877 1 month ago	116-45922 116 days ago	15-82816 15 days
28499	yoh-tanimoto author:yoh-tanimoto	feat(MeasureTheory/VectorMeasure): add integral of a vector-valued function against a vector measure	add `VectorMeasureWithPairing.integral` for normed vector spaces `E`, `F`, a Banach space `G` , a continuous linear pairing `B : E →L[ℝ] F →L[ℝ] → G` and an `F`-valued vector measure `μ`, which should be informally written as `∫ B (f x) ∂μ x`. motivation: there are natural vector measures such as signed measures and complex measures, and their integrals appear naturally e.g. in a proof of the spectral theorem for general bounded normal operators on a Hilbert space. - [ ] depends on: #26160 for the definition and lemmas about the total variation of a vector measure.	blocked-by-other-PR t-measure-probability merge-conflict	668/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	54-49753 1 month ago	233-77367 233 days ago	0-491 8 minutes
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	54-49751 1 month ago	229-25253 229 days ago	0-1 1 second
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	54-1538 1 month 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	54-408 1 month ago	82-15512 82 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	54-279 1 month ago	74-32157 74 days ago	0-15155 4 hours
34855	staroperator author:staroperator	feat(Order): use `to_dual` for `PFilter`	We can get rid of the whole `PFilter` file now. --- - [ ] depends on: #34820 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed large-import blocked-by-other-PR merge-conflict	361/268	Mathlib.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanAlgebra/Defs.lean,Mathlib/Order/Cofinal.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Order/PFilter.lean,Mathlib/Order/PrimeIdeal.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/Order/UpperLower/Principal.lean,Mathlib/Order/ZornAtoms.lean,Mathlib/RingTheory/IdealFilter/Basic.lean,Mathlib/Tactic/Translate/ToDual.lean	19	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	53-86304 1 month ago	unknown	0-0 0 seconds
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	53-77953 1 month ago	58-55001 58 days ago	0-562 9 minutes
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	53-73656 1 month ago	54-3293 54 days ago	27-814 27 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	53-28941 1 month ago	98-21488 98 days ago	5-47362 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	53-6590 1 month ago	53-6591 53 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	52-80031 1 month ago	57-69351 57 days ago	5-38408 5 days
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	52-33106 1 month ago	unknown	0-0 0 seconds
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	52-30580 1 month ago	264-36184 264 days ago	0-21 21 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	52-27708 1 month ago	52-74937 52 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	51-10088 1 month ago	61-29345 61 days ago	6-49759 6 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	50-69601 1 month ago	109-56990 109 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	50-68772 1 month ago	364-15038 364 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	50-61680 1 month 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	50-61679 1 month ago	384-38179 384 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	50-61679 1 month ago	381-41170 381 days ago	0-67928 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	50-61678 1 month ago	382-21844 382 days ago	0-801 13 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	50-44750 1 month ago	458-32266 458 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	50-38395 1 month ago	102-6220 102 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	50-32049 1 month ago	50-32117 50 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	50-30193 1 month ago	50-30264 50 days ago	0-1 1 second
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.) --- - [ ] depends on: #27898 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-linter awaiting-CI	339/20	Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/RewriteSearch.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/DocString.lean,MathlibTest/slow_simp.lean	37	5	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	50-27309 1 month ago	246-30984 246 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	50-22137 1 month ago	699-21337 699 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	50-21965 1 month ago	unknown	0-0 0 seconds
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	50-15296 1 month ago	74-21156 74 days ago	107-61660 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	50-14312 1 month ago	50-14312 50 days ago	0-2935 48 minutes
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	50-14187 1 month 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	50-14057 1 month ago	52-6513 52 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	50-7580 1 month ago	200-19356 200 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	50-3203 1 month ago	197-37031 197 days ago	20-70133 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	54/3	Mathlib/Tactic/Linter/Style.lean,MathlibTest/LintStyle.lean	2	2	['github-actions']	nobody	50-1848 1 month ago	50-30484 50 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	50-1468 1 month ago	50-28584 50 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	49-85254 1 month ago	193-41339 193 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	49-32484 1 month ago	120-29064 120 days ago	0-101 1 minute
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	49-2391 1 month ago	218-74032 218 days ago	0-2575 42 minutes
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	49-1518 1 month ago	80-66565 80 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	49-1268 1 month 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	48-76832 1 month ago	unknown	0-0 0 seconds
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	48-18325 1 month ago	48-18425 48 days ago	39-79348 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	48-17973 1 month ago	48-18727 48 days ago	39-33072 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	48-16834 1 month ago	48-18032 48 days ago	1-24662 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	48-12591 1 month ago	48-12797 48 days ago	39-9588 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	47-74968 1 month ago	139-40737 139 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	47-74965 1 month ago	82-23536 82 days ago	0-546 9 minutes
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	47-74840 1 month ago	47-74841 47 days ago	5-13758 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	47-74839 1 month ago	47-74839 47 days ago	4-79090 4 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	47-68865 1 month ago	47-68865 47 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	47-52742 1 month ago	134-75966 134 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	47-52609 1 month ago	98-30882 98 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	47-52608 1 month ago	101-34968 101 days ago	0-20 20 seconds
33441	dupuisf author:dupuisf	feat: add `LawfulInv` class for types with an inverse that behaves like `Ring.inverse`	This PR introduces a new typeclass `LawfulInv` for types which have an `Inv` instance that is equal to zero on non-invertible elements. This is meant to replace `Ring.inverse`. The current plan is to do this refactor in several steps: 1. This PR, which only introduces the class and adds instances for matrices and continuous linear maps. 2. Add instances for all C*-algebras, and make `CStarAlgebra` extend this. 3. Deprecate `Ring.inverse`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra merge-conflict label:t-algebra$	185/27	Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Invertible.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/RingTheory/DividedPowers/Padic.lean,Mathlib/Topology/Algebra/Module/Equiv.lean	7	35	['dupuisf', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	47-52481 1 month ago	75-85616 75 days ago	7-54141 7 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	47-52473 1 month ago	47-52474 47 days ago	34-16498 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 blocked-by-other-PR merge-conflict	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-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	47-52472 1 month ago	86-77414 86 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 awaiting-author merge-conflict	200/58	Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/SetTheory/Cardinal/ContinuumHypothesis.lean	3	21	['b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	nobody	47-51291 1 month ago	79-55287 79 days ago	0-76 1 minute
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	47-51287 1 month ago	64-80112 64 days ago	9-1774 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	47-51018 1 month 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	19	['adomani', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-bot', 'leanprover-radar', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	47-44907 1 month ago	220-41225 220 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	47-41308 1 month ago	47-38590 47 days ago	0-8005 2 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	47-32343 1 month ago	47-32344 47 days ago	17-1225 17 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) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	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	7	['github-actions', 'leanprover-radar', 'mathlib4-merge-conflict-bot', 'mcdoll', 'plp127']	nobody	46-24056 1 month ago	unknown	0-0 0 seconds
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	45-58923 1 month ago	unknown	0-0 0 seconds
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	45-40326 1 month ago	45-40329 45 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	45-34433 1 month ago	45-34433 45 days ago	55-47428 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	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	3	['github-actions', 'mathlib-dependent-issues']	nobody	45-32919 1 month ago	49-13704 49 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 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	45-31057 1 month ago	45-86057 45 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	45-30129 1 month ago	45-30129 45 days ago	13-78266 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	45-22356 1 month ago	122-7013 122 days ago	21-2681 21 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	2126/263	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	13	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	44-21986 1 month ago	107-66042 107 days ago	3-68616 3 days
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	44-20267 1 month ago	60-20439 60 days ago	0-455 7 minutes
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	43-56317 1 month ago	690-40196 690 days ago	0-55656 15 hours
35620	inaciovasquez2020 author:inaciovasquez2020	feat(Fintype): choose element from nonempty finite type	This PR adds a noncomputable choice function for finite types with nonzero cardinality. * `Fintype.chooseOfCardNeZero` provides a witness of `α` from `[Fintype α]` assuming `Fintype.card α ≠ 0`. * A regression test is included in `MathlibTest/Fintype/ChooseOfCardNeZero.lean`. The construction follows existing mathlib choice patterns and is explicitly marked `noncomputable`.	t-data new-contributor	21/0	Mathlib.lean,Mathlib/Data/Fintype/Choose.lean,MathlibTest/Fintype/ChooseOfCardNeZero.lean	3	4	['github-actions', 'plp127', 'vihdzp']	nobody	43-53265 1 month ago	43-69573 43 days ago	0-448 7 minutes
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	2	['github-actions', 'mathlib-dependent-issues']	nobody	43-8390 1 month ago	58-51931 58 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	42-49241 1 month ago	42-49241 42 days ago	30-23357 30 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 --- - [ ] 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	42-35338 1 month ago	144-40354 144 days ago	0-1 1 second
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	42-16259 1 month ago	42-61823 42 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	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	42-15473 1 month ago	42-70230 42 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	41-80938 1 month ago	117-81808 117 days ago	2-78371 2 days
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	41-22236 1 month ago	197-68024 197 days ago	2-46827 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	41-17715 1 month ago	41-63251 41 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	20	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-radar', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'urkud']	j-loreaux assignee:j-loreaux	41-7684 1 month ago	41-7684 41 days ago	15-63882 15 days
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 awaiting-author	205/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	6	['github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-merge-conflict-bot', 'thefundamentaltheor3m', 'wwylele']	urkud assignee:urkud	40-81058 1 month ago	40-81058 40 days ago	34-11222 34 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	40-77274 1 month ago	99-84422 99 days ago	3-73599 3 days
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	40-64355 1 month ago	41-292 41 days ago	0-479 7 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	40-64124 1 month ago	40-66372 40 days ago	0-122 2 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	40-27777 1 month ago	297-39921 297 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	39-80636 1 month ago	44-30264 44 days ago	17-25728 17 days
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	10872/6465	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/AB.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/AB.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.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/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/Finsupp.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/DualNumber.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/EuclideanDomain/Field.lean,Mathlib/Algebra/EuclideanDomain/Int.lean,Mathlib/Algebra/Exact.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/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/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,Mathlib/Algebra/Group/Hom/Instances.lean	2727	2	['github-actions', 'mathlib-merge-conflicts']	nobody	39-39915 1 month ago	unknown	0-0 0 seconds
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	39-39279 1 month ago	385-17218 385 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	39-39263 1 month ago	336-21157 336 days ago	39-61332 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	39-24109 1 month ago	80-27227 80 days ago	1-44258 1 day
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	38-77103 1 month 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	38-76952 1 month ago	38-82742 38 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	38-68404 1 month ago	40-76893 40 days ago	11-35673 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	38-59292 1 month ago	303-2191 303 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	38-56818 1 month ago	54-26064 54 days ago	0-531 8 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	38-33886 1 month 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	38-23590 1 month ago	327-6062 327 days ago	17-16443 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	38-21271 1 month ago	44-8644 44 days ago	0-103 1 minute
35868	Raph-DG author:Raph-DG	feat(Topology): Added in a 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/)	WIP t-topology	78/0	Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean	1	1	['github-actions']	nobody	38-20744 1 month ago	38-23218 38 days ago	0-15 15 seconds
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	38-15244 1 month ago	55-31841 55 days ago	0-6 6 seconds
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	37-85975 1 month ago	37-85975 37 days ago	38-12430 38 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	37-75073 1 month ago	44-6692 44 days ago	0-371 6 minutes
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	37-30475 1 month ago	unknown	0-0 0 seconds
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	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']	joneugster assignee:joneugster	37-21246 1 month ago	47-41311 47 days ago	13-82065 13 days
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	37-21122 1 month ago	68-7385 68 days ago	0-19754 5 hours
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	36-75924 1 month ago	41-3320 41 days ago	8-28783 8 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	36-26781 1 month ago	41-996 41 days ago	0-306 5 minutes
34649	peabrainiac author:peabrainiac	feat(Analysis/Calculus/ContDiff): add notation `ℕ∞ω` for `WithTop ℕ∞`	Add a `ContDiff`-scoped notation `ℕ∞ω` for `WithTop ℕ∞`, accompanying the existing notations `∞` and `ω` for `(⊤ : ℕ∞) : ℕ∞ω` and `⊤ : ℕ∞ω`. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/RFC.3A.20notation.20for.20.60WithTop.20.E2.84.95.E2.88.9E.60/near/573917824) I've also replaced `WithTop ℕ∞` with this new notation already in the files that mention it the most, but not in all files yet; many mention `WithTop ℕ∞` just a couple of times but don't open the `ContDiff` namespace. I'm not sure whether that should be taken as a sign to not make the notation scoped, or whether the solution is just to `open scoped ContDiff` in these files or not use the notation there. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-analysis awaiting-author awaiting-zulip merge-conflict	221/218	Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.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/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/Deriv.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/ImplicitContDiff.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/VectorField.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/InverseDeriv.lean,Mathlib/Geometry/Manifold/Algebra/LieGroup.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/Geometry/Manifold/Algebra/Structures.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/FiberwiseLinear.lean	28	5	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'peabrainiac']	sgouezel assignee:sgouezel	36-4831 1 month ago	54-79472 54 days ago	8-6287 8 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	35-60986 1 month ago	279-40719 279 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	35-53004 1 month ago	131-65275 131 days ago	64-60811 64 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	35-36617 1 month ago	35-39735 35 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	35-33916 1 month ago	48-21921 48 days ago	0-3706 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	35-30156 1 month ago	235-15566 235 days ago	10-67838 10 days
33790	eliasjudin author:eliasjudin	feat(CategoryTheory/Preadditive/Mat): add natural transformation and isomorphism extension theorems	Add extensionality lemmas for natural transformations and comparisons `L ≅ Mat_.lift F` in the additive envelope `Mat_`. - Add `Mat_.natTrans_ext`: a natural transformation `F ⟶ G` between functors `Mat_ C ⥤ D` (with `G` additive) is determined by its components on objects of the form `(embedding C).obj X`. - Add `Mat_.liftIso_ext_comp_embeddingLiftIso`: a small uniqueness lemma for comparisons `L ≅ lift F`. These lemmas streamline arguments around the universal property of `Mat_` by reducing equalities to components on objects coming from `C` via `embedding C`. No new instances or simp attributes; only `Mathlib/CategoryTheory/Preadditive/Mat.lean` changes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	68/20	Mathlib/CategoryTheory/Preadditive/Mat.lean	1	15	['eliasjudin', 'github-actions', 'joelriou', 'kim-em', 'mathlib-merge-conflicts']	nobody	35-15493 1 month ago	87-3891 87 days ago	0-25088 6 hours
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	181/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	35-14838 1 month ago	168-14565 168 days ago	0-22513 6 hours
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	35-13272 1 month ago	298-45804 298 days ago	0-2 2 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	35-8959 1 month 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	35-7364 1 month ago	251-75030 251 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	35-7362 1 month 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	34-85631 1 month 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	34-85618 1 month ago	unknown	0-0 0 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 awaiting-author t-algebra merge-conflict label:t-algebra$	278/7	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/RingTheory/PiTensorProduct.lean,Mathlib/SetTheory/Cardinal/Finite.lean	12	33	['eric-wieser', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	mattrobball assignee:mattrobball	34-60716 1 month ago	167-17482 167 days ago	97-17590 97 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	212/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/Compact.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	34-53154 1 month ago	285-53203 285 days ago	0-23 23 seconds
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	34-46454 1 month ago	209-42804 209 days ago	27-52841 27 days
35576	Tehlikeli107 author:Tehlikeli107	⚡ [performance] Pre-compile regexes in lake-build-wrapper.py	- Pre-compile `file_info_re` and `progress_re` in `BuildOutputProcessor.__init__` to avoid repeated compilation overhead. - Replace `re.sub(r'\.', '/', target)` with `target.replace('.', '/')` for better performance when converting module names to file paths. These changes result in a measured ~40% performance improvement in the core processing logic of the wrapper script. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-author CI new-contributor merge-conflict	8/707	scripts/bench/README.md,scripts/bench/build/README.md,scripts/bench/build/fake-root/bin/lean,scripts/bench/build/fake-root/bin/lean.py,scripts/bench/build/lakeprof_report_template.html,scripts/bench/build/lakeprof_report_upload.py,scripts/bench/build/run,scripts/bench/combine.py,scripts/bench/lint/README.md,scripts/bench/lint/run,scripts/bench/measure.py,scripts/bench/open-mathlib/README.md,scripts/bench/open-mathlib/run,scripts/bench/repeatedly.py,scripts/bench/run,scripts/bench/size/README.md,scripts/bench/size/run,scripts/bench/size/run.py,scripts/lake-build-wrapper.py	19	7	['bryangingechen', 'felixpernegger', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	34-39540 1 month ago	45-5813 45 days ago	0-8924 2 hours
36000	eliasjudin author:eliasjudin	add reindexing, fibers pseudofunctor, internal categories, and single-morphism descent	## Summary - FiberedCategory: `PseudofunctorOfFibers.lean` (pseudofunctor of fibers for a fibered category), `Reindexing.lean` (reindexing functors and coherence isos) - InternalCategory: `Basic.lean` (minimal internal category structure over a category with pullbacks) - Sites/Descent: `SingleMorphism.lean` (descent data and comparison functor for a single morphism; `IsDescentMorphism` / `IsEffectiveDescentMorphism`) - Mathlib.lean: import updates Naming follows mathlib convention (e.g. `singleMorphismComparisonFunctor` in lowerCamelCase for definitions).	t-category-theory new-contributor	783/0	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/PseudofunctorOfFibers.lean,Mathlib/CategoryTheory/FiberedCategory/Reindexing.lean,Mathlib/CategoryTheory/InternalCategory/Basic.lean,Mathlib/CategoryTheory/Sites/Descent/SingleMorphism.lean	5	5	['eliasjudin', 'github-actions', 'joelriou', 'mathlib-bors']	nobody	34-36617 1 month ago	34-39635 34 days ago	0-42869 11 hours
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	33-57916 1 month ago	33-57917 33 days ago	0-1891 31 minutes
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	33-34439 1 month ago	142-25257 142 days ago	44-24509 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	33-33424 1 month ago	244-33310 244 days ago	0-449 7 minutes
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 awaiting-author	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	57	['JovanGerb', 'Vierkantor', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'grunweg', 'hrmacbeth', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	33-21904 1 month ago	33-21904 33 days ago	112-29409 112 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	32-79821 1 month ago	32-79039 32 days ago	0-1899 31 minutes
36167	WenrongZou author:WenrongZou	feat(RingTheory/FormalGroup): construction of additive inverse of formal group	construction of additive inverse --- - [ ] depends on: #35912 [![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/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Evaluation.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Trunc.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	32-57765 1 month ago	32-57766 32 days ago	0-1359 22 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	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	32-24044 1 month ago	55-36799 55 days ago	0-2 2 seconds
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	1	['github-actions']	nobody	32-21027 1 month ago	32-20644 32 days ago	0-454 7 minutes
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	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	79	['botbaki-review', 'github-actions', 'grunweg', 'michaellee94', 'ocfnash']	ocfnash assignee:ocfnash	32-16714 1 month ago	33-83027 33 days ago	15-3412 15 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	32-5821 1 month ago	unknown	0-0 0 seconds
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 --- 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	69	['fpvandoorn', 'github-actions', 'jcommelin', 'leanprover-bot', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'themathqueen']	joelriou assignee:joelriou	32-2991 1 month ago	131-23066 131 days ago	66-7772 66 days
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	32-2858 1 month ago	156-71113 156 days ago	17-75931 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	32-2857 1 month ago	154-3718 154 days ago	23-31743 23 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	31-81849 1 month ago	86-42161 86 days ago	0-43623 12 hours
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	31-73289 1 month ago	69-24764 69 days ago	0-252 4 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	31-73274 1 month ago	45-14051 45 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	31-73258 1 month ago	39-24963 39 days ago	0-2518 41 minutes
35985	urkud author:urkud	feat: vector bundle of `ContinuousAlternatingMap`s	--- - [ ] depends on: #35984 - [ ] depends on: #34491 - [ ] depends on: #34513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	872/192	Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean,Mathlib/Topology/Algebra/Module/Multilinear/Topology.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/ContinuousAlternatingMap.lean,Mathlib/Topology/VectorBundle/Hom.lean	10	4	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	31-64096 1 month ago	35-18518 35 days ago	0-106 1 minute
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	15/1	Mathlib/Data/Fintype/Option.lean	1	3	['github-actions', 'joneugster']	joneugster assignee:joneugster	31-39787 1 month ago	66-20130 66 days ago	2-59629 2 days
30185	alreadydone author:alreadydone	feat(MathlibTest): kernel reduction of nsmul on elliptic curve over ZMod	Co-authored-by: @SteffenReith --- - [x] depends on: #30144 - [x] depends on: #30181 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory t-algebraic-geometry awaiting-author label:t-algebra$	21/0	MathlibTest/EllipticCurve.lean	1	9	['alreadydone', 'github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	31-39121 1 month ago	66-6590 66 days ago	1-15522 1 day
34245	staroperator author:staroperator	feat(Data/Set): add `Set.Uncountable`	There are `Set` specialized shortcuts `Set.Finite`, `Set.Infinite` and `Set.Countable`, but lacking `Set.Uncountable`. I find this useful in #34246. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-zulip	82/4	Mathlib/Analysis/Real/Cardinality.lean,Mathlib/Data/Set/Countable.lean,Mathlib/SetTheory/Cardinal/Basic.lean	3	17	['github-actions', 'joneugster', 'staroperator', 'vihdzp']	joneugster assignee:joneugster	31-37506 1 month ago	62-10753 62 days ago	12-21154 12 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	31-29331 1 month ago	871-6705 871 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	31-29303 1 month ago	511-20409 511 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	31-29280 1 month ago	623-81704 623 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	31-29261 1 month ago	606-7431 606 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	31-29249 1 month ago	291-28988 291 days ago	91-69159 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	31-29232 1 month ago	502-69867 502 days ago	0-214 3 minutes
34123	staroperator author:staroperator	feat(Data/Set/Finite): finite distributivity for complete distributive lattices	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	52/0	Mathlib/Data/Set/Finite/Lattice.lean	1	12	['Komyyy', 'github-actions', 'plp127', 'staroperator']	Komyyy assignee:Komyyy	31-27127 1 month ago	31-27128 31 days ago	46-3989 46 days
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	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	14	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	31-26150 1 month ago	31-26203 31 days ago	0-84995 23 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	31-20319 1 month ago	142-16502 142 days ago	99-26893 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	31-18248 1 month ago	80-46775 80 days ago	10-68503 10 days
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	39791/341	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/CochainComplexPlus.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/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/HomologicalComplexLimitsEventuallyConstant.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/Lifting.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/Refinements.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	314	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	31-18167 1 month ago	297-9998 297 days ago	0-2 2 seconds
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	31-13955 1 month ago	54-1149 54 days ago	0-1418 23 minutes
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	31-11621 1 month ago	181-76629 181 days ago	110-51265 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	31-10290 1 month 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	31-9552 1 month ago	unknown	0-0 0 seconds
35436	daniel-carranza author:daniel-carranza	feat(CategoryTheory/Monoidal/Closed): Prove the isomorphism of internal hom objects C(x \otimes y, z) and C(y, C(x, z))	Prove the currying-uncurrying isomorphism `C(x \otimes y, z) \iso C(y, C(x, z))` between internal hom objects of a closed monoidal category `C`. --- This result is connected to the infinity-cosmos project, and is used to prove that a closed monoidal category enriched in itself admits all cotensors. ~Line 81 currently contains a one-line proof in tactics mode `exact rfl`. When trying to use `rfl` outside of tactics mode, an error is thrown~ (Fixed, thank you @robin-carlier!). Any help with this (or any other aspect of the formalization) is greatly appreciated! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory infinity-cosmos delegated	89/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Closed/InternalCurrying.lean	2	15	['dagurtomas', 'daniel-carranza', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	adamtopaz assignee:adamtopaz	31-5394 1 month ago	38-79933 38 days ago	7-67484 7 days
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']	kex-y assignee:kex-y	31-5358 1 month ago	31-5332 31 days ago	15-85459 15 days
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	31-5348 1 month ago	237-71894 237 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	31-1307 1 month ago	194-38303 194 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	30-73728 30 days ago	42-1977 42 days ago	47-76964 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	30-73483 30 days ago	81-12596 81 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	30-62203 30 days ago	45-44243 45 days ago	5-13145 5 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	30-62201 30 days ago	49-12175 49 days ago	0-568 9 minutes
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	30-26037 30 days ago	46-43603 46 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/Topology/VectorBundle/Notation.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	30-25959 30 days ago	53-33084 53 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	30-13590 30 days ago	74-10265 74 days ago	0-1122 18 minutes
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	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	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	30-8466 30 days ago	107-83457 107 days ago	0-1 1 second
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	3	['github-actions']	nobody	30-6456 30 days ago	30-9771 30 days ago	0-96 1 minute
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	30-1569 30 days ago	unknown	0-0 0 seconds
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/)	file-removed blocked-by-other-PR t-algebraic-geometry	762/2	Mathlib/AlgebraicGeometry/OrderOfVanishing.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean,Mathlib/Topology/KrullDimension.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	28-38638 28 days ago	200-29412 200 days ago	0-672 11 minutes
36398	chrisflav author:chrisflav	feat(RingTheory): a finite étale algebra is étale locally finite split	From Pi1. --- - [ ] depends on: #36399 [![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	296/5	Mathlib/LinearAlgebra/TensorProduct/Associator.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/Flat/Rank.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,Mathlib/RingTheory/TotallySplit.lean,Mathlib/RingTheory/Unramified/Basic.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	28-14716 28 days ago	28-15373 28 days ago	0-1558 25 minutes
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	27-86092 27 days ago	66-12390 66 days ago	14-12127 14 days
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	27-43257 27 days 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	27-43240 27 days ago	33-28631 33 days ago	0-3 3 seconds
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	27-18361 27 days ago	40-64669 40 days ago	0-122 2 minutes
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 awaiting-author	135/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	3	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash', 'winstonyin']	ocfnash assignee:ocfnash	27-6762 27 days ago	27-6762 27 days ago	7-63206 7 days
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	26-84610 26 days ago	75-85920 75 days ago	0-46829 13 hours
30329	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): integrating against a measure as a continuous linear map on test functions	--- - [ ] depends on: #30004 - [ ] depends on: #32228 - [ ] depends on: #30327 - [x] depends on: #31806 - [x] depends on: #31533 - [x] depends on: #31470 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] 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 blocked-by-other-PR t-analysis	999/6	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/TestAgainst.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-81607 26 days ago	180-25409 180 days ago	0-766 12 minutes
30327	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): add characterizations of continuity for linear maps on test functions	--- - [ ] depends on: #31806 - [x] depends on: #30309 - [x] depends on: #31470 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] 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 blocked-by-other-PR t-analysis	774/5	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Function.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-81606 26 days ago	180-27662 180 days ago	0-64 1 minute
30255	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): specialize singleton seminorm family for D_K^n when n finite	Co-authored by: @ADedecker --- - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] depends on: #30239 - [ ] depends on: #30236 - [ ] depends on: #30202 - [ ] depends on: #30201 - [ ] depends on: #30199 - [ ] depends on: #30198 - [ ] depends on: #30197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR t-analysis	476/3	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Function.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-81603 26 days ago	183-3210 183 days ago	0-126 2 minutes
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	463/18	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean	1	5	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	26-79985 26 days ago	183-3208 183 days ago	0-599 9 minutes
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	26-73464 26 days ago	110-85297 110 days ago	9-42873 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	506/0	Mathlib/Analysis/Distribution/Sobolev.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean	2	7	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	nobody	26-72658 26 days ago	100-68638 100 days ago	0-1 1 second
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	26-51484 26 days ago	38-83729 38 days ago	2-47211 2 days
36330	urkud author:urkud	feat(UpperHalfPlane): define PGL action on the upper half-plane	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author t-analysis	285/5	Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/FixedPoints.lean,Mathlib/Analysis/Complex/UpperHalfPlane/MoebiusAction.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/FinTwo.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Projective.lean	5	23	['github-actions', 'loefflerd', 'urkud']	nobody	26-23697 26 days ago	27-27106 27 days ago	2-64876 2 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	26-18733 26 days ago	unknown	0-0 0 seconds
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	26-4229 26 days ago	46-43156 46 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	26-3029 26 days ago	26-2212 26 days ago	0-1127 18 minutes
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	25-80661 25 days ago	unknown	0-0 0 seconds
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	25-74766 25 days ago	25-74492 25 days ago	0-364 6 minutes
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	25-62042 25 days ago	47-85107 47 days ago	9-52768 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	25-56164 25 days ago	602-16603 602 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	25-39601 25 days ago	80-48460 80 days ago	10-65787 10 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	25-39057 25 days ago	805-10545 805 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	25-39024 25 days ago	789-22465 789 days ago	0-1135 18 minutes
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	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	23	['erdOne', 'github-actions', 'grunweg']	grunweg assignee:grunweg	25-38334 25 days ago	25-78727 25 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	25-23640 25 days ago	25-23641 25 days ago	0-1252 20 minutes
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	25-14148 25 days ago	25-17818 25 days ago	0-16 16 seconds
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	183/2	Mathlib/Analysis/Convex/Uniform.lean	1	1	['github-actions']	faenuccio assignee:faenuccio	24-82074 24 days ago	25-741 25 days ago	0-20 20 seconds
36163	mcdoll author:mcdoll	feat(Analysis/SpecialFunctions): `rpow` is locally integrable	Local integrability of real powers. This is only of interest at the origin, where `‖x‖ ^ (-α)` is not bounded. Co-authored-by: Michael Douglas --- From https://github.com/mrdouglasny/OSforGFF and made mathlib ready by me [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	71/0	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Constructions/HaarToSphere.lean	2	4	['github-actions', 'j-loreaux']	nobody	24-82037 24 days ago	24-82037 24 days ago	7-77804 7 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	24-81229 24 days ago	123-75360 123 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	24-81158 24 days ago	122-17329 122 days ago	2-61446 2 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	24-61342 24 days ago	138-80529 138 days ago	57-16569 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	24-59771 24 days ago	55-17172 55 days ago	0-15928 4 hours
35740	LLaurance author:LLaurance	chore(SimpleGraph/Basic): clean up and shorten	Clean up and shorten some proofs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics WIP merge-conflict	43/50	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	3	['LLaurance', 'github-actions', 'mathlib-merge-conflicts']	nobody	24-47611 24 days ago	26-73708 26 days ago	13-4742 13 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	24-38579 24 days ago	51-35789 51 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	24-28539 24 days ago	unknown	0-0 0 seconds
36602	yuanyi-350 author:yuanyi-350	feat(ProbabilityTheory): Add Kolmogorov's two-series theorem	- [ ] depends on: #36545 ref: https://en.wikipedia.org/wiki/Kolmogorov%27s_two-series_theorem --- [![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	261/0	Mathlib.lean,Mathlib/Probability/CondVar.lean,Mathlib/Probability/Martingale/Kolmogorov.lean,Mathlib/Probability/Martingale/OptionalStopping.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	24-17812 24 days ago	24-17813 24 days ago	0-1172 19 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	24-9611 24 days ago	24-9612 24 days ago	25-82526 25 days
36485	Paul-Lez author:Paul-Lez	feat(Data/Finset/Finite): `Finset.sigma` commutes with `Finset.filter`	Not so sure about the `simp` tag - reviewer feedback welcome on that:) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy awaiting-author	7/0	Mathlib/Data/Finset/Sigma.lean	1	6	['Paul-Lez', 'eric-wieser', 'github-actions']	nobody	23-83019 23 days ago	25-59427 25 days ago	0-47312 13 hours
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	23-40545 23 days ago	unknown	0-0 0 seconds
35510	chrisflav author:chrisflav	feat(RingTheory): weakly étale algebras	From Proetale. --- - [x] depends on: #35455 - [x] depends on: #35590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory	392/0	Mathlib.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/Etale/Weakly.lean,Mathlib/RingTheory/RingHom/Flat.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	23-19430 23 days ago	46-79927 46 days ago	0-1 1 second
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	23-14043 23 days ago	602-43417 602 days ago	0-1791 29 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	23-14031 23 days ago	521-34662 521 days ago	29-26213 29 days
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	23-14019 23 days ago	351-45413 351 days ago	56-56728 56 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	23-14007 23 days ago	332-37303 332 days ago	72-3718 72 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	23-13993 23 days ago	313-63096 313 days ago	19-33859 19 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	23-13978 23 days ago	248-51112 248 days ago	36-67657 36 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	23-13964 23 days ago	244-13494 244 days ago	12-24721 12 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	23-13952 23 days ago	138-45027 138 days ago	114-38193 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	23-13940 23 days ago	230-35964 230 days ago	8-1216 8 days
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	23-13929 23 days ago	174-40135 174 days ago	12-3204 12 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	23-13906 23 days ago	82-6288 82 days ago	43-77956 43 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	23-13886 23 days ago	67-2127 67 days ago	59-63981 59 days
36607	harahu author:harahu	chore(AlgebraicTopology): normalize continuation line indentation	We standardize indentation such that continuation lines now line up with the first line of the item they're continuing. This is enforced by markdown formatters such as `mdformat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	4/4	Mathlib/AlgebraicTopology/CechNerve.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean	2	2	['github-actions', 'mathlib-bors']	nobody	22-85487 22 days ago	22-85489 22 days ago	1-12598 1 day
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	22-83082 22 days ago	22-83082 22 days ago	9-26617 9 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	22-47124 22 days ago	23-29791 23 days ago	15-68575 15 days
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 awaiting-author	29/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	6	['YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	22-38727 22 days ago	22-38727 22 days ago	21-32645 21 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	22-27526 22 days ago	24-51637 24 days ago	27-58977 27 days
24373	YaelDillies author:YaelDillies	refactor: golf `modularCharacter`	... using the lessons learned from `distribHaarChar`. Unfortunately, the two setups can't quite be unified because we are lacking an additive version of `MulDistribMulAction`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-measure-probability	77/45	Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Group/ModularCharacter.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	22-15666 22 days ago	unknown	0-0 0 seconds
21342	YaelDillies author:YaelDillies	refactor(Normed/Group/Quotient): generalise to non-abelian groups	The goal is to apply this to free groups, whose multiplication in either argument is an isometry, but isn't commutative. --- - [x] depends on: #21341 - [ ] depends on: #35037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	97/70	Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Bornology/BoundedOperation.lean	6	12	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	22-15431 22 days ago	22-14951 22 days ago	11-70695 11 days
19475	YaelDillies author:YaelDillies	feat: group markings	From LeanCamCombi --- - [ ] depends on: #21342 [![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$	270/70	Mathlib.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Geometry/Group/Marking.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Bornology/BoundedOperation.lean	8	16	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	22-15390 22 days ago	430-16476 430 days ago	22-16818 22 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	22-11907 22 days ago	30-34681 30 days ago	0-80618 22 hours
33958	chrisflav author:chrisflav	feat(AlgebraicGeometry): the small affine étale site	From Proetale. Co-authored-by: Joël Riou This is a draft. --- - [x] depends on: #35711 - [x] depends on: #35240 - [x] depends on: #34976 - [x] depends on: #33957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebraic-geometry merge-conflict	454/23	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/Etale.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Sites/AffineEtale.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Sheaf.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Connected.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	9	7	['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	22-11511 22 days ago	82-35410 82 days ago	0-333 5 minutes
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	1656/0	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	6	3	['github-actions', 'mathlib-bors']	nobody	22-9879 22 days ago	44-74732 44 days ago	0-6 6 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 merge-conflict	8702/323	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/Finsupp/PointwiseSMul.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	45	30	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	22-7728 22 days ago	298-8134 298 days ago	0-2 2 seconds
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	22-7481 22 days ago	136-30014 136 days ago	70-24709 70 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	21-42497 21 days ago	21-42498 21 days ago	26-74403 26 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	21-35362 21 days ago	unknown	0-0 0 seconds
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	127/0	Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	21-33576 21 days ago	24-31289 24 days ago	0-1 1 second
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	21-31902 21 days ago	unknown	0-0 0 seconds
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_prime_coeff_eq_one`: for prime `p`, all coefficients of `cyclotomic p R` equal `1`. - `eq_nsmul_cyclotomic_of_nonneg_coeff`: a nonneg-coefficient polynomial vanishing at a primitive root is a positive scalar multiple of the cyclotomic polynomial. - `card_fiber_eq_card_div`: if a function `d : A → ZMod p` satisfies `∑ ζ^(d a) = 0`, then every fiber has cardinality `\|A\| / p`. These results are useful for combinatorial applications involving exponential sums and equidistribution over cyclic groups. Theorems imported from: https://github.com/Latinum-Agentic-Commerce/AlgebraicDesignTheory	t-ring-theory new-contributor awaiting-author	101/1	Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean	2	5	['github-actions', 'grunweg', 'ocfnash']	ocfnash assignee:ocfnash	21-20009 21 days ago	33-11349 33 days ago	9-45761 9 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.	t-algebra new-contributor awaiting-author label:t-algebra$	231/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/Probability/Markov/Stationary.lean	3	12	['dennj', 'dupuisf', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'riccardobrasca']	nobody	21-19860 21 days ago	38-61564 38 days ago	10-33013 10 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$	61/3	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/DistribLattice.lean	3	2	['github-actions']	nobody	21-19663 21 days ago	21-18453 21 days ago	0-2836 47 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	21-19604 21 days ago	unknown	0-0 0 seconds
34934	zorkary author:zorkary	feat(Data/List): add constructive split classifiers	## Summary This PR adds a small constructive list-classification utility module: - `Mathlib/Data/List/SplitClassify.lean` (new file) - `Mathlib.lean` (one new public import) The goal is to provide reusable case-data classifiers for common split equalities, so downstream proofs can branch on explicit structure instead of repeatedly rebuilding list-shape arguments. ## Added API - `List.append_cons_eq_singleton` - `List.ConsSplit` - `List.classify_cons_vs_split` - `List.SwapSplit` - `List.classify_swap_vs_split` ## Scope and non-goals - No existing theorem statements were changed. - No existing proof logic was modified. - This is a narrow additive change (new module + one import). ## Build I verified: - `lake build Mathlib.Data.List.SplitClassify` ## Duplicate/overlap check Before opening this PR, I checked local mathlib sources and GitHub search for likely overlap, including targeted searches for: - `classify_cons_vs_split` - `classify_swap_vs_split` - `append_cons_eq_singleton` - open PRs/issues around list split/classification helpers I did not find direct existing equivalents or open PRs with the same API. ## AI usage disclosure I used AI assistance (Codex/LLM) for drafting and implementation support. I understand the high-level intent and have validated the module builds. I am opening this as a draft specifically to get maintainer review on technical details before marking it ready.	t-data new-contributor LLM-generated	213/0	Mathlib.lean,Mathlib/Data/List/SplitClassify.lean	2	1	['github-actions']	nobody	21-19350 21 days 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	14	['copilot-pull-request-reviewer', 'github-actions', 'homeowmorphism', 'mathlib-bors', 'plp127', 'tb65536']	tb65536 assignee:tb65536	21-19253 21 days ago	31-82435 31 days ago	4-30999 4 days
36443	Fieldnote-Echo author:Fieldnote-Echo	feat(Combinatorics/SimpleGraph): add SimpleGraph.ball (open metric ball)	Add `SimpleGraph.ball`, the open ball in the graph extended metric. ## Design decisions - Open ball (strict `<`, not `≤`): `ball c ⊤` coincides with the connected component of `c`, whereas a closed ball would give `closedBall c ⊤ = univ`. - Named `SimpleGraph.ball` (not `eball`): since `dist`-valued balls are less natural for disconnected graphs, the `e` prefix is unnecessary. - Graph-specific (not via `PseudoEMetricSpace`): avoids importing `ℝ`. AI assistance: Claude (Opus 4.6) helped draft and iterate on the implementation. I reviewed the code line by line and vouch for the final contents. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/SimpleGraph.20metric.20balls/with/577846803). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor LLM-generated	59/3	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	36	['Fieldnote-Echo', 'Rida-Hamadani', 'SnirBroshi', 'github-actions', 'lauramonk', 'vlad902']	nobody	21-19032 21 days ago	27-17544 27 days ago	27-17534 27 days
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 awaiting-author LLM-generated	103/0	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean	1	7	['github-actions', 'joelriou', 'kim-em', 'robin-carlier']	nobody	21-18853 21 days ago	33-70117 33 days ago	3-22470 3 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 merge-conflict LLM-generated	51/3	Mathlib/CategoryTheory/Galois/EssSurj.lean,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']	joneugster assignee:joneugster	21-18852 21 days ago	48-62720 48 days ago	37-27992 37 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	21-18851 21 days ago	89-70201 89 days ago	0-7055 1 hour
34558	kim-em author:kim-em	feat(Topology): add StrictMono finite partition lemmas and path partitioning	This PR adds: In `UnitInterval.lean`: - `exists_strictMono_Icc_subset_open_cover_Icc`: finite partition with strictly monotone points indexed by `Fin (n + 1)` for general closed intervals - `exists_strictMono_Icc_subset_open_cover_unitInterval`: the unit interval version - `continuous_convexCombo`: continuity of convex combinations In `Path.lean`: - `Path.exists_partition_in_cover`: Lebesgue partition lemma for paths - any open cover of a path's range can be refined to a finite partition - `Path.exists_partition_with_property`: neighborhood version - if every point on a path has a neighborhood with property P, get a partition with each segment in such a neighborhood These are useful for path homotopy arguments where a finite, strict partition is needed. This is split out from https://github.com/leanprover-community/mathlib4/pull/31576 to allow independent review. 🤖 Prepared with Claude Code	t-topology awaiting-author LLM-generated	174/0	Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	2	16	['botbaki-review', 'github-actions', 'jcommelin', 'kim-em']	jcommelin assignee:jcommelin	21-18849 21 days ago	40-52908 40 days ago	26-83695 26 days
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 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	1	['github-actions']	nobody	21-18849 21 days ago	unknown	0-0 0 seconds
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	21-18847 21 days ago	unknown	0-0 0 seconds
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	21-18843 21 days ago	52-77199 52 days ago	0-663 11 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. 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. 🤖 Prepared with Claude Code	documentation awaiting-author enhancement merge-conflict LLM-generated	241/3	.claude/skills/to_dual/SKILL.md,Mathlib/Tactic/Translate/ToDual.lean	2	30	['JovanGerb', 'MichaelStollBayreuth', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'vihdzp']	JovanGerb assignee:JovanGerb	21-18842 21 days ago	46-2840 46 days ago	6-73284 6 days
34892	kim-em author:kim-em	experiment: by claude		LLM-generated	88/0	claude.md	1	1	['github-actions']	nobody	21-18679 21 days ago	unknown	0-0 0 seconds
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	21-18632 21 days ago	89-36441 89 days ago	0-112 1 minute
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	21-18627 21 days ago	73-51572 73 days ago	0-795 13 minutes
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	21-18622 21 days ago	55-24138 55 days ago	63-18466 63 days
31576	kim-em author:kim-em	feat: in a semilocally simply connected, locally path-connected space, the quotient of paths by homotopy has the discrete topology	This is closely related to, but not quite the same, as the quotient path space with fixed initial point being an even covering (under the endpoint map). Depends on - [ ] #31449 - [x] #31525 - [x] #31574 - [x] #31575 - [ ] #34557 - [ ] #34558 Claude wrote most of the text, under my prompting.	LLM-generated	1574/1	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Centroid.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	8	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	21-18614 21 days ago	unknown	0-0 0 seconds
31449	kim-em author:kim-em	feat(SemilocallySimplyConnected): definition and alternative formulation	Note: Proofs in this PR were developed with assistance from Claude.	t-topology awaiting-author LLM-generated	266/0	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/Topology/Path.lean	5	17	['ADedecker', 'alreadydone', 'github-actions', 'jcommelin', 'kim-em', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	21-18606 21 days ago	47-48051 47 days ago	64-72534 64 days
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	8	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	21-18518 21 days ago	266-79276 266 days ago	0-84441 23 hours
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	12	['FrankieeW', 'MichaelStollBayreuth', 'github-actions', 'mathlib-merge-conflicts', 'tb65536']	MichaelStollBayreuth assignee:MichaelStollBayreuth	21-7976 21 days ago	27-25730 27 days ago	15-50831 15 days
36387	FrankieeW author:FrankieeW	feat(NumberTheory/QuadraticField): parameter uniqueness for quadratic fields	- [ ] depends on: #36347 ## 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` ---	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	21-7963 21 days ago	28-57535 28 days ago	0-2 2 seconds
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	32/18	Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	20	['chrisflav', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'sun123zxy']	chrisflav assignee:chrisflav	21-5846 21 days ago	21-8651 21 days ago	16-12398 16 days
34375	jvanwinden author:jvanwinden	feat(MeasureTheory/Function/AEEqOfLIntegral): introduce lemmas for rewriting a.e. inequalities	Introduce the following lemmas: - ae_le_const_iff_forall_gt_imp_ae_lt, - ae_const_le_iff_forall_lt_imp_ae_gt, - ae_le_const_iff_forall_gt_imp_ae_le, - ae_const_le_iff_forall_lt_imp_ae_ge, which can be used get an epsilon of room in a.e. inequalities, with the epsilon being outside the a.e. quantifier. The 'le/ge' variants require a dense ordering. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	24/0	Mathlib/MeasureTheory/Function/AEEqOfLIntegral.lean	1	10	['EtienneC30', 'github-actions', 'jvanwinden', 'urkud']	kex-y assignee:kex-y	20-83309 20 days ago	31-14888 31 days ago	41-4810 41 days
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	580/0	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/PresentedGroup.lean	10	26	['eric-wieser', 'github-actions', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier', 'tb65536', 'themathqueen']	tb65536 assignee:tb65536	20-81004 20 days ago	53-37856 53 days ago	13-11162 13 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	awaiting-author t-group-theory LLM-generated merge-conflict	86/0	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/PresentedGroup.lean	6	9	['eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen']	thorimur assignee:thorimur	20-79461 20 days ago	46-60946 46 days ago	6-12224 6 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	203/0	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/PresentedGroup.lean	8	7	['eric-wieser', 'github-actions', 'joneugster', 'kim-em', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	20-79460 20 days ago	52-72422 52 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	418/0	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/PresentedGroup.lean	9	5	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	20-79458 20 days ago	52-72424 52 days ago	0-624 10 minutes
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	20-79452 20 days ago	unknown	0-0 0 seconds
36314	JovanGerb author:JovanGerb	feat(gcongr): support `rintro` patterns	This PR adds support for `rintro` patterns in the `with` clause of `gcongr`. This makes it consistent with `congr!`. I've only found one case in mathlib where this could actually be used to shorten a proof. I split the gcongr `elab` into a separate `syntax` and `elab_rules`, which makes it easier to deal with the syntax. I noticed that the implementation of `congr!` was unnecessarily converting back and forth between `rintroPat` and `rcasesPat`, so I changed it to simply only use `rintroPat`, and then did the same in `gcongr`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	41/28	Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Tactic/CongrExclamation.lean,Mathlib/Tactic/Convert.lean,Mathlib/Tactic/Core.lean,Mathlib/Tactic/GCongr/Core.lean	5	2	['dupuisf', 'github-actions']	dwrensha assignee:dwrensha	20-69882 20 days ago	30-32929 30 days ago	30-33047 30 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	20-60577 20 days ago	20-59177 20 days ago	0-3928 1 hour
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	11	['Vierkantor', 'dagurtomas', 'github-actions', 'mathlib4-dependent-issues-bot']	Vierkantor assignee:Vierkantor	20-24252 20 days ago	60-10665 60 days ago	15-81158 15 days
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	20-18312 20 days ago	26-78486 26 days ago	27-45743 27 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	20-17761 20 days ago	59-18715 59 days ago	0-83167 23 hours
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	20-17612 20 days ago	59-20525 59 days ago	2-23785 2 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	304/194	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	5	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	20-16935 20 days ago	59-18182 59 days ago	1-62439 1 day
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	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	70	['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	20-9596 20 days ago	20-9596 20 days ago	43-65908 43 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	20-8779 20 days ago	20-16144 20 days ago	12-46044 12 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	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	20-5170 20 days ago	40-33163 40 days ago	0-45583 12 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	238/208	Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Deriv.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Fourier.lean	3	9	['github-actions', 'j-loreaux', 'mcdoll']	j-loreaux assignee:j-loreaux	19-86308 19 days ago	19-86308 19 days ago	9-43106 9 days
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	19-81514 19 days ago	51-28867 51 days ago	0-1258 20 minutes
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	19-77044 19 days ago	46-38206 46 days ago	0-187 3 minutes
36545	yuanyi-350 author:yuanyi-350	feat(ProbabilityTheory): Add Kolmogorov's inequality	ref: https://en.wikipedia.org/wiki/Kolmogorov%27s_inequality --- - [x] depends on: #36542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability large-import	147/0	Mathlib.lean,Mathlib/Probability/CondVar.lean,Mathlib/Probability/Martingale/Kolmogorov.lean,Mathlib/Probability/Martingale/OptionalStopping.lean	4	3	['CoolRmal', 'github-actions', 'mathlib-dependent-issues']	RemyDegenne assignee:RemyDegenne	19-69892 19 days ago	24-34864 24 days ago	24-36643 24 days
36786	SproutSeeds author:SproutSeeds	feat(DoubleCounting): parity of odd-degree vertices in bipartite incidence	Adds `odd_card_filter_odd_bipartiteAbove_iff_odd_card_filter_odd_bipartiteBelow` to `Mathlib.Combinatorics.Enumerative.DoubleCounting`. This is the small parity-helper first step for #25231. Validation: - `lake build Mathlib.Combinatorics.Enumerative.DoubleCounting` Supersedes closed #36077 after replaying the helper cleanly on current `master`. AI usage: used Codex for branch recovery, replay onto current `master`, and draft wording; final code choices and verification by me.	new-contributor t-combinatorics large-import	17/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean	1	2	['github-actions']	nobody	19-64391 19 days ago	19-64474 19 days ago	19-64464 19 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	503/1	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	8	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	19-40792 19 days ago	24-1932 24 days ago	0-1 1 second
32305	faenuccio author:faenuccio	feat: define Sobolev Spaces	Nothing to see yet. --- - [ ] depends on: #32250 - [ ] depends on: #31809 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis large-import blocked-by-other-PR	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	7	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-16816 19 days ago	126-26511 126 days ago	0-2 2 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	19-13987 19 days ago	65-81738 65 days ago	0-1 1 second
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	19-12179 19 days ago	228-18627 228 days ago	64-11252 64 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	19-12147 19 days ago	99-1546 99 days ago	1-46473 1 day
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	19-12066 19 days ago	74-19846 74 days ago	54-22055 54 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 label:t-algebra$	300/2	Mathlib.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct/Set.lean	3	28	['PrParadoxy', 'dagurtomas', 'eric-wieser', 'github-actions', 'goliath-klein', 'leanprover-radar', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-12039 19 days ago	105-11230 105 days ago	10-66980 10 days
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	19-12013 19 days ago	83-84757 83 days ago	16-55121 16 days
35652	dennj author:dennj	feat(LinearAlgebra/Matrix): add `Matrix.mul_eq_smul_one_symm`	## Summary - Add `Matrix.mul_eq_smul_one_symm`: if `M * N = c • 1` and `det M ≠ 0`, then `N * M = c • 1` - A scalar generalisation of `mul_eq_one_symm` (the `c = 1` case) to arbitrary scalars, requiring `IsDomain` and `det M ≠ 0` - The proof uses the adjugate identity `adjugate M * M = det M • 1` to derive `det M • (N * M) = det M • (c • 1)`, then cancels `det M` via `mul_left_cancel₀` Theorem imported from: https://github.com/Latinum-Agentic-Commerce/AlgebraicDesignTheory	t-algebra new-contributor awaiting-author LLM-generated label:t-algebra$	28/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	4	['dagurtomas', 'eric-wieser', 'github-actions', 'grunweg']	nobody	19-11890 19 days ago	25-19314 25 days ago	17-73114 17 days
36105	LLaurance author:LLaurance	chore(Algebra): shorten proofs, style	Golf, avoid terminal `simp only`, use namespaces where available, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	119/165	Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/Center.lean,Mathlib/Algebra/Star/CentroidHom.lean	8	2	['LLaurance', 'github-actions']	nobody	19-11813 19 days ago	26-73814 26 days ago	6-55674 6 days
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	19-11760 19 days ago	25-2373 25 days ago	8-31258 8 days
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/)		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	3	['github-actions', 'j-loreaux', 'leanprover-radar']	nobody	19-5376 19 days ago	19-5652 19 days ago	0-616 10 minutes
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$	64/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	19-4179 19 days ago	19-2684 19 days ago	0-3566 59 minutes
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/)		227/11	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	13	6	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-83034 18 days ago	unknown	0-0 0 seconds
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` --- Builds on: #31121 Related to: #29639, #29643, #29646	awaiting-author t-algebra new-contributor label:t-algebra$	282/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	3	25	['github-actions', 'jessealama', 'joelriou', 'kim-em', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	18-80577 18 days ago	163-44412 163 days ago	35-45800 35 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 --- - [x] depends on: #33249 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	110/1	Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Nodup.lean	5	18	['Rida-Hamadani', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	18-70444 18 days ago	18-70444 18 days ago	13-56327 13 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	323/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/ErdosStoneSimonovits.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	18-69910 18 days ago	35-49403 35 days ago	35-49439 35 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	2	['github-actions', 'mathlib-dependent-issues']	kex-y assignee:kex-y	18-46139 18 days ago	21-34322 21 days ago	21-34313 21 days
36844	grunweg author:grunweg	perf: lower priority of NormedAlgebraicFoo -> AlgebraicFoo instances	We never unbundled the normed and algebra hierarchies, and this is causing performance problems in #36299 and friends. Try if lowering the respective instance priorities helps. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-CI	6/0	Mathlib/Analysis/Normed/Group/Defs.lean,Mathlib/Analysis/Normed/Module/Basic.lean	2	3	['github-actions', 'grunweg', 'leanprover-radar']	nobody	18-39142 18 days ago	18-39211 18 days ago	0-6 6 seconds
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	18-31160 18 days ago	44-80770 44 days ago	0-114 1 minute
35892	vlad902 author:vlad902	feat(Data): lemmas for `List.bagInter`	Basic API lemmas for `List.bagInter` and correct a few misnamed lemmas. Co-authored-by: Aristotle (Harmonic) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	60/5	Mathlib/Data/List/Lattice.lean,Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/Multiset/UnionInter.lean	3	11	['Vierkantor', 'github-actions']	Vierkantor assignee:Vierkantor	18-27793 18 days ago	18-27793 18 days ago	18-52633 18 days
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/)		56/61	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	5	4	['JovanGerb', 'github-actions', 'linesthatinterlace']	nobody	18-21352 18 days ago	18-17721 18 days ago	0-11097 3 hours
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	96/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/SmoothEmbedding.lean	4	56	['chrisflav', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'sgouezel']	PatrickMassot assignee:PatrickMassot	18-17297 18 days ago	81-9963 81 days ago	0-1863 31 minutes
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	18-11248 18 days ago	26-16340 26 days ago	0-163 2 minutes
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	64/2	Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'parabamoghv', 'robin-carlier']	robin-carlier assignee:robin-carlier	18-9170 18 days ago	18-9170 18 days ago	7-83579 7 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 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	4	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	18-5688 18 days ago	18-5688 18 days ago	11-55488 11 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 blocked-by-other-PR merge-conflict	69/2	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-83115 17 days ago	52-22190 52 days ago	0-947 15 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	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	17-83105 17 days ago	18-42035 18 days ago	0-1289 21 minutes
34906	seewoo5 author:seewoo5	feat(NumberTheory/Bernoulli): von Staudt-Clausen theorem	--- Rado's proof ("A New Proof of a Theorem of v. Staudt", JLMS 1935) of [von Staudt-Clausen theorem](https://en.wikipedia.org/wiki/Von_Staudt%E2%80%93Clausen_theorem). Initially written by AxiomProver (see commit 97a308e) with further golfs with Claude and Codex. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory large-import awaiting-author LLM-generated	509/4	Mathlib/NumberTheory/Bernoulli.lean,docs/references.bib	2	28	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib-bors', 'seewoo5']	MichaelStollBayreuth assignee:MichaelStollBayreuth	17-83065 17 days ago	28-2488 28 days ago	23-3163 23 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 awaiting-author	228/0	Mathlib.lean,Mathlib/CategoryTheory/EquivalenceRelation.lean,Mathlib/CategoryTheory/Limits/Shapes/RegularMono.lean	3	4	['dagurtomas', 'github-actions']	b-mehta assignee:b-mehta	17-67121 17 days ago	17-67121 17 days ago	7-19645 7 days
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	278/49	Mathlib.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/Filter/Germ/Product.lean	4	4	['alok', 'github-actions', 'plp127']	nobody	17-66977 17 days ago	unknown	0-0 0 seconds
36170	SproutSeeds author:SproutSeeds	feat(ContMDiff): add ContMDiff scalar-action typeclasses	Closes #5617 Following the API pattern of `ContinuousConstSMul` and `ContinuousSMul`, this PR adds a smoothness parameter `n` to `ContMDiffConstSMul` and `ContMDiffSMul`, factors the generic `ContMDiff` scalar-action API into a dedicated file, and keeps `NormedSpace` focused on the standard scalar/vector instance. It also adds the corresponding `const_smul` and `smul` lemmas (`WithinAt`, `At`, `On`, and global versions). Tools used: Codex 5.3 extra high ---	t-differential-geometry new-contributor awaiting-author LLM-generated	154/21	Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Geometry/Manifold/Algebra/SmoothFunctions.lean,Mathlib/Geometry/Manifold/ContMDiff/MulAction.lean,Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.lean	5	22	['SproutSeeds', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib-merge-conflicts', 'sgouezel']	PatrickMassot assignee:PatrickMassot	17-52982 17 days ago	26-51477 26 days ago	4-45581 4 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	17-47645 17 days ago	19-10426 19 days ago	10-34309 10 days
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	17-44448 17 days ago	unknown	0-0 0 seconds
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/)	blocked-by-other-PR t-number-theory large-import merge-conflict	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	17-34423 17 days ago	39-39233 39 days ago	0-537 8 minutes
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	17-33560 17 days ago	17-65371 17 days ago	0-2503 41 minutes
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	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	17-17687 17 days ago	52-77200 52 days ago	0-963 16 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	merge-conflict LLM-generated	217/579	Mathlib/Data/Set/Lattice.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/CompleteLattice/Finset.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Tactic/SetLike.lean	7	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-17684 17 days ago	52-78179 52 days ago	0-918 15 minutes
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	17-17647 17 days ago	76-45213 76 days ago	0-1530 25 minutes
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	332/0	Mathlib.lean,Mathlib/Topology/Category/TopCat/Closeds.lean	2	22	['Brian-Nugent', 'dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	17-15933 17 days ago	17-15933 17 days ago	17-63465 17 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	151/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Contraction.lean,Mathlib/Combinatorics/SimpleGraph/Minor.lean	3	7	['YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vbeffara']	YaelDillies assignee:YaelDillies	17-15127 17 days ago	18-23054 18 days ago	31-49634 31 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	17-12924 17 days ago	17-12925 17 days ago	24-18556 24 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	17-7000 17 days ago	17-6953 17 days ago	60-20351 60 days
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	17-1598 17 days ago	267-72835 267 days ago	0-1 1 second
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	17-1597 17 days ago	247-25584 247 days ago	15-64386 15 days
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	17-1474 17 days ago	241-40910 241 days ago	0-32626 9 hours
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 merge-conflict	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	17-414 17 days ago	55-5812 55 days ago	36-2785 36 days
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	245/10	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	7	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-166 17 days ago	59-32671 59 days ago	0-10 10 seconds
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 - [ ] 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	16-82524 16 days ago	280-21815 280 days ago	0-5139 1 hour
34709	dennj author:dennj	feat(Analysis/ODE): add discrete Grönwall inequality	## Summary Add discrete Grönwall inequality to `Mathlib/Analysis/ODE/DiscreteGronwall.lean` Provides bounds for recurrence inequalities of the form `u(n+1) ≤ c(n) * u(n) + b(n)` ### Main results - `discrete_gronwall_prod_general`: Product form working over any linearly ordered commutative ring - `prod_one_add_Ico_mono`: Auxiliary lemma for product comparisons over subintervals - `discrete_gronwall`: Classical exponential bound `u(n) ≤ (u(n₀) + ∑ b(k)) * exp(∑ c(i))` (ℝ-specific) - `discrete_gronwall_Ico`: Uniform bound over a finite interval (ℝ-specific) ## Related work Complements the continuous Grönwall inequality in `Mathlib.Analysis.ODE.Gronwall` ## References * Grönwall, T. H. (1919). "Note on the derivatives with respect to a parameter of the solutions of a system of differential equations". Annals of Mathematics, 20(4), 292–296.	t-analysis new-contributor LLM-generated awaiting-author merge-conflict	174/0	Mathlib.lean,Mathlib/Analysis/ODE/DiscreteGronwall.lean	2	12	['github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	16-80949 16 days ago	17-72 17 days ago	46-59271 46 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	16-74110 16 days ago	59-36758 59 days ago	0-796 13 minutes
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	16-73258 16 days ago	unknown	0-0 0 seconds
35622	SnirBroshi author:SnirBroshi	feat(Logic/Function/Basic): `onFun` and `swap` preserve relation properties	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	141/19	Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Defs.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/WellFounded.lean,Mathlib/Order/WithBot.lean	8	7	['SnirBroshi', 'github-actions', 'leanprover-radar', 'vihdzp']	awainverse assignee:awainverse	16-69935 16 days ago	31-60352 31 days ago	43-44193 43 days
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	41/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	3	11	['CBirkbeck', 'Multramate', 'erdOne', 'github-actions', 'riccardobrasca']	kim-em assignee:kim-em	16-69930 16 days ago	30-80 30 days ago	30-70 30 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	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	16-53865 16 days ago	54-32489 54 days ago	33-85043 33 days
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	353/15	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	8	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-47017 16 days ago	173-28155 173 days ago	0-13 13 seconds
35755	Vilin97 author:Vilin97	feat(Analysis/ODE): forward Euler method convergence	## Summary - Define the forward Euler method (`ODE.EulerMethod.step`, `point`, `slope`, `path`, `deriv`) in `Analysis/ODE/EulerMethod.lean`. - Prove the local truncation error bound `dist_deriv_le`: `dist(deriv(t), v(t, path(t))) ≤ h(L + KM)`. - Prove the global error bound `dist_path_le` via Gronwall's inequality. - Prove convergence `tendsto_path`: `path(v, h, t₀, y₀, t) → sol(t)` as `h → 0⁺`. ## Motivation The forward Euler method is the simplest numerical method for ODEs and a natural complement to the existing Gronwall inequality (`Mathlib.Analysis.ODE.Gronwall`) and Picard-Lindelöf theorem (`Mathlib.Analysis.ODE.PicardLindelof`). This formalization is based on the [forward_euler](https://github.com/Vilin97/forward_euler) project. Depends on #35753. --- 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).	new-contributor WIP LLM-generated merge-conflict	297/0	Mathlib.lean,Mathlib/Analysis/ODE/EulerMethod.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	4	4	['github-actions', 'mathlib-merge-conflicts']	nobody	16-42462 16 days ago	40-43555 40 days ago	0-674 11 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	16-42455 16 days ago	33-9529 33 days ago	0-2 2 seconds
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	184/8	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	16-42453 16 days ago	31-19644 31 days ago	0-8 8 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	16-42452 16 days ago	28-9602 28 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	16-35870 16 days ago	unknown	0-0 0 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	16-26000 16 days ago	205-36661 205 days ago	0-104 1 minute
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	16-25999 16 days ago	unknown	0-0 0 seconds
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/)	merge-conflict t-algebra awaiting-CI label:t-algebra$	54/42	Mathlib/Algebra/Module/Submodule/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	16-25997 16 days ago	unknown	0-0 0 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	16-25996 16 days ago	unknown	0-0 0 seconds
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	16-25995 16 days ago	424-30784 424 days ago	0-200 3 minutes
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	16-24307 16 days ago	16-24307 16 days ago	2-67942 2 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	16-22319 16 days ago	91-879 91 days ago	21-3598 21 days
34797	vlad902 author:vlad902	feat(SimpleGraph): `cycleGraph.cycle` is a cycle	(A follow-up PR will show that `cycleGraph.cycle` is also hamiltonian.) --- - [x] depends on: #35360 - [x] depends on: #34766 - [x] depends on: #34796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	32/1	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	16-12978 16 days ago	18-9381 18 days ago	19-38290 19 days
34805	DavidLedvinka author:DavidLedvinka	feat(Tactic): generalize ofScientific NormNum extension to `DivisionSemiring`	Co-authored-by: @hrmacbeth	t-meta	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']	JovanGerb assignee:JovanGerb	16-474 16 days ago	16-475 16 days ago	36-41877 36 days
34315	LessnessRandomness author:LessnessRandomness	feat(Combinatorics/SimpleGraph/Bipartite): Prove upper bound of edge set cardinality of bipartite graph	Two ways to express upper bound of the edge set of bipartite graph: 1) If the cardinalities of both parts/sets, that make bipartite graph, are known, then the upper bound is equal to product of the cardinalities of both parts; 2) Four times of the cardinality of the edge set is less or equal to squared cardinality of vertex set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	54/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	56	['LessnessRandomness', 'SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	awainverse assignee:awainverse	15-85911 15 days ago	15-85981 15 days ago	67-77921 67 days
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	476/5	Mathlib.lean,Mathlib/AlgebraicTopology/InvarianceOfDomain.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/Order.lean	5	2	['github-actions']	nobody	15-83742 15 days ago	15-83696 15 days ago	0-6854 1 hour
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 α β Gr`: A typeclass extending `GraphLike` with together with `inv`, an involution function on darts that swaps `fst` and `snd`. * Instance of `GraphLike α (Digraph α)` with `darts G := { (u, v) \| G.Adj u v }` * Instance of `SymmGraphLike α (SimpleGraph α)` with `darts G := { (u, v) \| G.Adj u v }` --- - [ ] 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	406/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/GraphLike/Symm.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	15-77949 15 days ago	19-2191 19 days ago	0-154 2 minutes
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: #36829 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	796/0	Mathlib.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/GraphLike/Symm.lean,Mathlib/Combinatorics/GraphLike/Walks/Basic.lean,Mathlib/Combinatorics/GraphLike/Walks/Prod.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	15-77601 15 days ago	20-73985 20 days ago	0-547 9 minutes
35413	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	This PR continues the work from #21182. Original PR: https://github.com/leanprover-community/mathlib4/pull/21182	t-meta	73/6	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	3	['github-actions', 'joneugster', 'mathlib-bors']	alexjbest and dwrensha assignee:dwrensha assignee:alexjbest	15-69926 15 days ago	49-13161 49 days ago	49-13151 49 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 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/Sites/SmallAffineZariski.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Connected.lean	7	26	['chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	15-69925 15 days ago	34-16478 34 days ago	30-10012 30 days
35414	joneugster author:joneugster	feat(Cache): Allow arguments of the form `Mathlib.Data.+` which correspond to a folder but not a file	This PR continues the work from #21838. Original PR: https://github.com/leanprover-community/mathlib4/pull/21838	CI t-meta	74/31	Cache/IO.lean,Cache/Main.lean	2	2	['github-actions', 'joneugster']	nobody	15-69912 15 days ago	49-13089 49 days ago	49-13079 49 days
35632	SnirBroshi author:SnirBroshi	feat(Data/List/TakeDrop): `take`/`drop` + `tail`/`dropLast` almost commute	--- - [ ] depends on https://github.com/leanprover/lean4/issues/12910 [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/List.2Etail.2FList.2EdropLast.20.2B.20List.2Etake/with/572294698) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-core-PR	22/0	Mathlib/Data/List/TakeDrop.lean	1	8	['SnirBroshi', 'github-actions', 'joneugster', 'mathlib-merge-conflicts']	nobody	15-69909 15 days ago	19-45853 19 days ago	24-9640 24 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	15-69906 15 days ago	34-35001 34 days ago	55-73479 55 days
36783	wwylele author:wwylele	feat(RingTheory/Localization): R ⧸ pⁿ ≃+* Rₚ ⧸ (maximalIdeal Rₚ)ⁿ	This extends the existing `def equivQuotMaximalIdeal : R ⧸ p ≃+* Rₚ ⧸ maximalIdeal Rₚ` to powers of maximal ideals. --- Disclosure of AI usage: I chat with AI for a sketch of the proof. The code is entirely written by me. I didn't state the simp lemma for the symm direction because I am not sure how to state it. Following the analog of equivQuotMaximalIdeal_symm_apply_mk, this should be ``` theorem equivQuotMaximalIdealPow_symm_apply_mk (x : R) (s : p.primeCompl) : (equivQuotMaximalIdealPow p Rₚ n).symm (Ideal.Quotient.mk _ (IsLocalization.mk' Rₚ x s)) = (Ideal.Quotient.mk (p ^ n) x) * (Ideal.Quotient.mk (p ^ n) s)⁻¹ := by ``` But `(Ideal.Quotient.mk (p ^ n) s)⁻¹` is taking inverse in a non-field ring. Here the inverse always exists because s is not in p. What is the mathlib way to say this? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	53/0	Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Nilpotent.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean	3	1	['github-actions']	chrisflav assignee:chrisflav	15-69904 15 days ago	19-69869 19 days ago	19-69859 19 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 merge-conflict	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/VertexConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/IsolateVerts.lean	3	139	['0xTerencePrime', 'SnirBroshi', 'SproutSeeds', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	15-69882 15 days ago	25-39195 25 days ago	35-56704 35 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	15-62734 15 days ago	15-62808 15 days ago	0-7 7 seconds
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	127/0	Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean	2	30	['SnirBroshi', 'SproutSeeds', 'github-actions', 'jcommelin', 'ksenono']	nobody	15-55951 15 days ago	15-55951 15 days ago	98-81589 98 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	30/0	Mathlib/Order/UpperLower/Basic.lean	1	6	['SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	15-42901 15 days ago	23-69898 23 days ago	23-69888 23 days
36785	hommmmm author:hommmmm	feat(RingTheory/Localization): Nagata's criterion for primality in localization away	## Summary - Add `dvd_of_mem_span_singleton_localization`: if `p` is prime and `p ∤ x`, then membership in the span of the image of `x` in `R[1/p]` implies divisibility by `x`. - Add `prime_of_prime_in_localization` (Nagata's criterion): if `p` is prime, `x` is irreducible, and the image of `x` in `R[1/p]` is prime, then `x` is prime. ## References - [Stacks Project, Tag 0AFU](https://stacks.math.columbia.edu/tag/0afu) ## AI Disclosure This code is written without AI, then uses Claude Code with cameronfreer's [Lean4-skills](https://github.com/cameronfreer/lean4-skills) (specifically, the `review`, `refactor`, and `golf` workflow) for style changes, refactoring and golfing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	72/0	Mathlib.lean,Mathlib/RingTheory/Localization/Away/Prime.lean	2	4	['chrisflav', 'github-actions', 'hommmmm']	chrisflav assignee:chrisflav	15-1294 15 days ago	15-1294 15 days ago	19-27905 19 days
35655	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): strongly regular graphs have diameter 2	A strongly regular graph with positive `μ` must have diameter 2, as long as the vertex set is nontrivial and it is not complete. --- - [x] depends on: #35657 This statement is useful in the literature, I wanted to add it after seeing it being used in the proof of the Hoffman-Singleton theorem. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	18/0	Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	14-84752 14 days ago	14-86351 14 days ago	15-15459 15 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	8	['SnirBroshi', 'github-actions', 'ksenono', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	14-78111 14 days ago	109-46597 109 days ago	0-136 2 minutes
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	14-69926 14 days ago	34-8388 34 days ago	3-44515 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. --- - [ ] depends on: #30436 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	427/1	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Pentagonal.lean,Mathlib/Topology/Algebra/InfiniteSum/Pentagonal.lean,docs/1000.yaml	4	43	['copilot-pull-request-reviewer', 'github-actions', 'jcommelin', 'mathlib4-dependent-issues-bot', 'tb65536', 'urkud', 'vihdzp', 'wwylele']	eric-wieser assignee:eric-wieser	14-69876 14 days ago	54-21484 54 days ago	100-47494 100 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	77/10	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	25	['Komyyy', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	14-69870 14 days ago	67-5437 67 days ago	78-50842 78 days
34809	YaelDillies author:YaelDillies	feat: induced subgraphs of complete multipartite graphs are complete multipartite	From ProofBench --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	4/2	Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean	1	1	['github-actions']	kmill assignee:kmill	14-69862 14 days ago	61-84545 61 days ago	61-84535 61 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	t-algebra new-contributor label:t-algebra$	135/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ShermanMorrison.lean	2	11	['Xxxjdjdid', 'banrovegrie', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	14-69859 14 days ago	60-18226 60 days ago	60-18216 60 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 label:t-algebra$	610/0	Archive.lean,Archive/Robbins.lean	2	1	['github-actions']	kim-em assignee:kim-em	14-69858 14 days ago	57-62484 57 days ago	57-64126 57 days
34994	bwangpj author:bwangpj	feat: Countable.of_module_finite	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import FLT label:t-algebra$	7/0	Mathlib/LinearAlgebra/Countable.lean	1	3	['bwangpj', 'eric-wieser', 'github-actions']	kim-em assignee:kim-em	14-69857 14 days ago	57-1598 57 days ago	57-1588 57 days
35365	wwylele author:wwylele	feat(LinearAlgebra/Simplex): closedInterior = interior + face.closedInterior	Intermediate lemma towards #34826. This will be used to show the measure on `interior` and `closedInterior` are equal, as the difference is a zero-measure set. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	53/0	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	4	['copilot-pull-request-reviewer', 'github-actions']	eric-wieser assignee:eric-wieser	14-69855 14 days ago	39-19484 39 days ago	50-14619 50 days
36308	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Subgraph): a couple of `subgraphOfAdj` lemmas	--- Also golfed a lemma (it's one line longer but it looks simpler to me). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/5	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	1	['github-actions']	kmill assignee:kmill	14-69849 14 days ago	30-49126 30 days ago	30-49116 30 days
36787	hommmmm author:hommmmm	feat(RingTheory/LocalRing): Krull dimension results for maximal ideal of local ring	## Summary This PR adds two results connecting the Krull dimension of a local ring to its maximal ideal: * `IsLocalRing.ringKrullDim_eq_zero_of_maximalIdeal_eq_bot`: A local ring whose maximal ideal is `⊥` has Krull dimension zero. * `IsLocalRing.exists_mem_maximalIdeal_not_mem_sq`: In a Noetherian local ring of positive Krull dimension, there exists an element in the maximal ideal that is not in its square. The second result follows from Nakayama's lemma: if every element of the maximal ideal `𝔪` were in `𝔪²`, then `𝔪 = 𝔪²`, and Nakayama gives `𝔪 = ⊥`, contradicting positive dimension. ## New file * `Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean` ## Acknowledgements Thanks to Dora Kassabova and Leopold Mayer for edit suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory	57/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/KrullDimension.lean	2	10	['NoahW314', 'github-actions', 'hommmmm', 'tb65536', 'wwylele']	chrisflav assignee:chrisflav	14-69843 14 days ago	19-767 19 days ago	19-62932 19 days
36789	hommmmm author:hommmmm	feat(RingTheory/Ideal/Height): prime ideal determined by height among overideals	## Summary - Add `Ideal.eq_of_le_of_height_eq`: a prime ideal of finite height is equal to any ideal of the same height that contains it. ## Notes This is a direct consequence of `Ideal.height_strict_mono_of_is_prime`: if `I` were strictly contained in `J`, their heights would differ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	10/0	Mathlib/RingTheory/Ideal/Height.lean	1	7	['github-actions', 'hommmmm', 'tb65536']	erdOne assignee:erdOne	14-69842 14 days ago	19-61879 19 days ago	19-61869 19 days
36970	astrainfinita author:astrainfinita	chore: redefine `Nat.div2` `Nat.bodd`	--- This PR continues the work from #13649. Original PR: https://github.com/leanprover-community/mathlib4/pull/13649	t-data	54/72	Mathlib/Computability/Primrec/Basic.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	7	2	['astrainfinita', 'github-actions']	TwoFX assignee:TwoFX	14-69835 14 days ago	15-58969 15 days ago	15-64348 15 days
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	14-58877 14 days ago	302-64302 302 days ago	0-8 8 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	14-49448 14 days ago	17-36188 17 days ago	0-10825 3 hours
35627	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Finite): min/max degrees of top/bot	And a couple of lemmas about `IsRegularOfDegree`, e.g. the empty graph is regular of any degree. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	30/1	Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/StronglyRegular.lean	2	15	['SnirBroshi', 'YaelDillies', 'github-actions', 'vlad902']	kmill assignee:kmill	14-45679 14 days ago	15-66101 15 days ago	41-14394 41 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	14-41941 14 days ago	14-42742 14 days ago	0-83 1 minute
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	156/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	3	5	['b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mitchell-horner']	nobody	14-39775 14 days ago	14-39840 14 days ago	14-45411 14 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	14-38429 14 days ago	633-40602 633 days ago	0-6775 1 hour
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	416/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Zarankiewicz.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,docs/1000.yaml	5	12	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner']	kmill assignee:kmill	14-35907 14 days ago	65-63819 65 days ago	37-76880 37 days
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	14-31383 14 days ago	14-31394 14 days ago	32-12136 32 days
35880	astrainfinita author:astrainfinita	feat(Order/Defs/LinearOrder): `min_ind`	It will be used to simplify the proofs of other lemmas in a subsequent PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	11/0	Mathlib/Order/Defs/LinearOrder.lean	1	3	['astrainfinita', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	14-29228 14 days ago	14-29228 14 days ago	37-14582 37 days
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 merge-conflict	127/2	Mathlib.lean,Mathlib/Data/Finset/Mex.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean	6	13	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	nobody	14-24334 14 days ago	39-11903 39 days ago	3-49487 3 days
36642	tb65536 author:tb65536	feat(NumberTheory/ArithmeticFunction/LFunction): arithmetic functions from power series	This PR constructs arithmetic functions from power series. See #36189 for how this will ultimately be used to construct L-functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra label:t-algebra$	139/0	Mathlib/NumberTheory/ArithmeticFunction/Defs.lean,Mathlib/NumberTheory/ArithmeticFunction/LFunction.lean,Mathlib/NumberTheory/Divisors.lean	3	8	['github-actions', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	14-14510 14 days ago	14-14510 14 days ago	23-22188 23 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 - [ ] depends on: #36201 - [x] depends on: #36407 - [x] depends on: #36408 - [ ] 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 blocked-by-other-PR	338/0	Mathlib.lean,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	7	5	['github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen']	nobody	14-6774 14 days ago	30-7397 30 days ago	0-626 10 minutes
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/)		4/21	Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Tactic/NormNum/DivMod.lean	4	1	['github-actions']	nobody	14-4455 14 days ago	14-4525 14 days ago	14-4515 14 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	420/387	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	187	14	['github-actions', 'j-loreaux', 'mathlib-bors', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-1207 14 days ago	143-78535 143 days ago	0-1 1 second
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	14-1083 14 days ago	107-5291 107 days ago	0-16 16 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	13-81541 13 days ago	70-84406 70 days ago	4-69251 4 days
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 awaiting-author LLM-generated merge-conflict	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	7	['JovanGerb', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	13-81405 13 days ago	26-28421 26 days ago	5-45722 5 days
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	52/1	Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Fintype/Pi.lean,Mathlib/Logic/Equiv/Fintype.lean	3	25	['DavidLedvinka', 'b-mehta', 'eric-wieser', 'github-actions', 'joneugster', 'pfaffelh']	TwoFX assignee:TwoFX	13-79702 13 days ago	59-73434 59 days ago	63-450 63 days
36585	vihdzp author:vihdzp	feat: order type of `Iio o` is `lift o`	Downstreamed from the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	19/17	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean	5	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	alreadydone assignee:alreadydone	13-79442 13 days ago	13-79502 13 days ago	23-25198 23 days
36693	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): * `Equiv.Perm.ofSubtype_swap_eq`: unchanged 🎉 * `Filter.hasBasis_biInf_of_directed'`: 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/)		2/15	Mathlib/GroupTheory/Perm/Support.lean,Mathlib/Order/Filter/Bases/Basic.lean	2	1	['artie2000', 'github-actions']	nobody	13-73092 13 days ago	22-807 22 days ago	22-797 22 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	1	['artie2000', 'github-actions']	nobody	13-72360 13 days ago	20-11770 20 days ago	20-11760 20 days
34477	spanning-tree author:spanning-tree	refactor(Order): make CompletePartialOrder extend OrderBot	Make `CompletePartialOrder` extend `OrderBot`, and add a constructor `completePartialOrderOfLubOfDirected`. Previously, `CompletePartialOrder` had an implicit bottom element but did not extend OrderBot explicitly. Breaking change: `CompletePartialOrder` instances must provide `⊥` and `bot_le`, or use the constructor. See discussion in [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.3E.20complete.20partial.20order.20and.20domain.20theory.20formalization). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	15/1	Mathlib/Order/CompletePartialOrder.lean	1	3	['Citronhat', 'github-actions', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	13-69929 13 days ago	36-22828 36 days ago	56-84375 56 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	3	['github-actions', 'wwylele']	joneugster assignee:joneugster	13-69925 13 days ago	43-33437 43 days ago	43-47933 43 days
36840	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Arithmetic): a few ordinal division lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	27/8	Mathlib/SetTheory/Ordinal/Arithmetic.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	alreadydone assignee:alreadydone	13-69915 13 days ago	18-67461 18 days ago	18-67451 18 days
36990	JovanGerb author:JovanGerb	fix(RefinedDiscrTree/Lookup): improve the matching score heuristic	This PR improves the order in which results come out of the `RefinedDiscrTree`. I've explained the motivation in the doc-string. This is probably not the most principled fix, but it is the least disruptive solution I could think of. For an example, try clicking on `\|0\|` in ``` import Mathlib example : \|(0 : ℝ)\| = 1 := by rw?? ``` And notice that the obvious result `abs_zero` is not the first result. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	44/8	Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean	1	1	['github-actions']	eric-wieser assignee:eric-wieser	13-69913 13 days ago	15-14009 15 days ago	15-13999 15 days
36999	themathqueen author:themathqueen	feat(Analysis/RCLike): lifting `C(X, ℝ)` to `C(X, 𝕜)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	69/0	Mathlib.lean,Mathlib/Analysis/RCLike/ContinuousMap.lean	2	1	['github-actions']	urkud assignee:urkud	13-69912 13 days ago	15-3193 15 days ago	15-3183 15 days
30122	xroblot author:xroblot	Development branch (1)	---	WIP large-import merge-conflict	4479/14	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	31	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	13-54713 13 days ago	186-34218 186 days ago	0-12 12 seconds
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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian WIP file-removed merge-conflict	708/65	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	31	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	13-47229 13 days ago	26-51474 26 days ago	1-16213 1 day
36958	JovanGerb author:JovanGerb	chore(Topology/Order/Basic): use `Preorder.topology` in `OrderTopology`	This PR addresses the comment: ``` TODO: define `Preorder.topology` before `OrderTopology` and reuse the def ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	22/19	Mathlib/Topology/Instances/Discrete.lean,Mathlib/Topology/Order/Basic.lean	2	1	['github-actions', 'vihdzp']	PatrickMassot assignee:PatrickMassot	13-42280 13 days ago	15-62059 15 days ago	15-62384 15 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	317/17	Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean	4	42	['JovanGerb', 'Vierkantor', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'ocfnash']	Vierkantor assignee:Vierkantor	13-35217 13 days ago	14-8928 14 days ago	6-60386 6 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	7	['SproutSeeds', 'github-actions', 'jsm28', 'ocfnash']	jsm28 assignee:jsm28	13-33850 13 days ago	13-33857 13 days ago	6-36700 6 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	241/24	Mathlib.lean,Mathlib/InformationTheory/KullbackLeibler/DataProcessing.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	13-32816 13 days ago	50-22228 50 days ago	0-1 1 second
34891	kim-em author:kim-em	wip: ConvexSpace constructor from binary convex combinations		t-algebra large-import merge-conflict label:t-algebra$	3498/0	Mathlib/LinearAlgebra/ConvexSpace.lean,Mathlib/LinearAlgebra/convex_plan.md	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	13-28541 13 days ago	unknown	0-0 0 seconds
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: #36829 - [ ] depends on: #36756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics merge-conflict	1978/1430	Archive/Wiedijk100Theorems/Konigsberg.lean,Mathlib.lean,Mathlib/Combinatorics/Digraph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/GraphLike/Symm.lean,Mathlib/Combinatorics/GraphLike/Walks/Basic.lean,Mathlib/Combinatorics/GraphLike/Walks/Prod.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Circulant.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.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/Sum.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.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	39	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	13-28535 13 days ago	15-64383 15 days ago	0-533 8 minutes
35084	edegeltje author:edegeltje	feat(Combinatorics/SimpleGraph): Cayley graph for structures with `Mul`/`Add`	This pr: - adds the definition `SimpleGraph.mulCayley`, where `x` is adjacent to a distinct `y` when there is `g` such that `x * g = y` or `x = y * g`, - proves various lemmas about the above, - adds/proves the additive versions of all of the above some related zulip conversation: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Cayley.20and.20circulant.20graph/with/572839048 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	141/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cayley.lean	2	44	['SnirBroshi', 'YaelDillies', 'edegeltje', 'github-actions', 'vihdzp', 'vlad902']	kmill assignee:kmill	13-22456 13 days ago	16-14476 16 days ago	53-334 53 days
37109	zeekmartin author:zeekmartin	feat(SimpleGraph): card of common neighbors equals card of triangles containing edge	Adds `SimpleGraph.card_commonNeighbors_eq_card_triangles_containing_edge` to `Mathlib/Combinatorics/SimpleGraph/Clique.lean`. For adjacent vertices `u v` in a finite simple graph, establishes the bijection between common neighbors and 3-cliques containing the edge `{u, v}`: ```lean theorem card_commonNeighbors_eq_card_triangles_containing_edge {u v : α} (huv : G.Adj u v) : (G.commonNeighbors u v).toFinset.card = ((G.cliqueFinset 3).filter fun s => {u, v} ⊆ s).card ``` This connects `commonNeighbors` (defined in `Basic.lean`) with `cliqueFinset` — a gap not previously covered in `Clique.lean`. AI disclosure: Claude (Anthropic) was used as an assistant during the development of this proof. It helped with the initial proof structure and tactic suggestions. The proof was reviewed and validated step by step by the author, who can vouch for all the content. The mathematical idea originates from the author's prior Lean 4 work on spectral graph theory (github.com/zeekmartin/topostability-lean4). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics LLM-generated new-contributor	61/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	7	['SnirBroshi', 'github-actions', 'zeekmartin']	nobody	13-8950 13 days ago	13-16109 13 days ago	13-16099 13 days
37121	Smithl-Lin author:Smithl-Lin	feat(Probability/Martingale): Ville's supermartingale inequality	## Ville's supermartingale inequality This PR formalizes Ville's inequality for nonnegative supermartingales, providing time-uniform probability bounds. ### Main results - `Supermartingale.integral_le`: for a supermartingale, `E[f_j] ≤ E[f_i]` when `i ≤ j` - `Supermartingale.measureReal_le_div`: basic Ville inequality, `μ{ω \| λ ≤ f n ω} ≤ E[f 0] / λ` - `Supermartingale.measureReal_le_div_forall`: quantified over all `n` - `Supermartingale.measureReal_sup_le_div`: supremum version, `μ{ω \| ∃ n, λ ≤ f n ω} ≤ E[f 0] / λ` (proof via optional stopping, sorry pending) - `Supermartingale.integral_stoppedValue_le`: `E[f_τ] ≤ E[f 0]` for bounded stopping times (sorry pending) ### Addresses #36641 This PR includes the supremum statement using `IsStoppingTime` and `stoppedValue` as requested by @RemyDegenne on #36641. The two remaining `sorry`s follow the documented stopping time argument and will be filled in a follow-up. ### Motivation Ville's inequality is the foundation of anytime-valid inference, e-values, and safe sequential testing (Shafer 2021, Ramdas et al. 2023). The supremum version provides time-uniform control strictly stronger than pointwise Markov. ### References - Ville, J. (1939). Étude critique de la notion de collectif. - Howard, Ramdas, McAuliffe, Sekhon (2021). Time-uniform, nonparametric, nonasymptotic confidence sequences. Ann. Statist.	t-measure-probability LLM-generated new-contributor	157/0	Mathlib.lean,Mathlib/Probability/Martingale/Ville.lean	2	3	['github-actions', 'mathlib-bors']	nobody	12-71476 12 days ago	13-769 13 days ago	0-482 8 minutes
36948	Parcly-Taxel author:Parcly-Taxel	feat: subtraction and ±1 lemmas for `IsCoprime, IsRelPrime`	From my Redhill PhD project.	t-ring-theory	84/0	Mathlib/RingTheory/Coprime/Basic.lean	1	1	['github-actions']	mattrobball assignee:mattrobball	12-69909 12 days ago	16-33600 16 days ago	16-33590 16 days
37013	kim-em author:kim-em	feat(Tactic/Linter): add instance diamond linter	This PR adds a linter that checks instance declarations for non-defeq diamonds in the typeclass hierarchy. For each instance whose return type is a class with multiple parents, the linter finds common ancestors reachable via different parent paths and checks that the projection paths yield definitionally equal results at `reducible_and_instances` transparency. The diagnostic output includes: - Root-cause filtering: only the most primitive failing ancestor is reported (e.g. `SubNegMonoid` rather than `AddGroup`, since the latter's failure is a consequence of the former's) - Differing fields: which fields of the ancestor class are non-defeq between the two paths - Divergence values: the whnf'd parent structures at the point of divergence, showing e.g. `zsmul := Ring.zsmul` vs `zsmul := AddGroupWithOne.zsmul` - Example statements: copy-pasteable `example : ... := by with_reducible_and_instances rfl` that demonstrate each failure The "Differing fields" lhs/rhs comparison currently shows the parent structure containing the differing field, rather than the field value itself. Improvements to this display are welcome in subsequent PRs. The linter is enabled by default. It currently fires on ~38 instances in Mathlib, mostly involving the `Ring`/`AddGroupWithOne`/`AddCommGroup` hierarchy — so CI will fail until those are addressed. 🤖 Prepared with Claude Code	t-linter large-import	361/0	Mathlib/Init.lean,Mathlib/Tactic/Linter/InstanceDiamond.lean,MathlibTest/Linter/InstanceDiamond.lean	3	1	['github-actions']	nobody	12-68397 12 days ago	12-65390 12 days ago	0-18324 5 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	235/169	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	63	11	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors', 'mathlib-merge-conflicts']	bryangingechen assignee:bryangingechen	12-45602 12 days ago	269-21650 269 days ago	2-53782 2 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']	awainverse assignee:awainverse	12-44445 12 days ago	22-54145 22 days ago	22-54135 22 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	12-44369 12 days ago	26-19928 26 days ago	22-62559 22 days
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	12-44119 12 days ago	95-33506 95 days ago	0-17677 4 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	12-43182 12 days ago	21-42536 21 days ago	0-322 5 minutes
34557	kim-em author:kim-em	feat(Topology/Homotopy): add Path.subpathOn for restricting paths to subintervals	This PR adds `Path.subpathOn`, which extracts a subpath from a path γ on an interval [a, b] ⊆ [0, 1] by reparametrizing via the affine map t ↦ a + t(b - a). ### Main results - `Path.subpathOn`: definition of the restricted path - `Path.subpathOn_trans`: composing subpaths is homotopic to the combined subpath - `Path.subpathOn_self`: the trivial subpath [a,a] is homotopic to the constant path - `Path.subpathOn_zero_one`: the full subpath [0,1] is homotopic to the original path - Quotient-level versions of these theorems This material is split out from https://github.com/leanprover-community/mathlib4/pull/31576 to allow independent review. PR #31576 will depend on this PR once merged. 🤖 Prepared with Claude Code	t-topology awaiting-author LLM-generated merge-conflict	216/0	Mathlib.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/UnitInterval.lean,Mathlib/Topology/UnitInterval/ConvexSpace.lean	4	9	['github-actions', 'jcommelin', 'mathlib-merge-conflicts']	jcommelin assignee:jcommelin	12-42688 12 days ago	47-47434 47 days ago	17-33035 17 days
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 blocked-by-other-PR merge-conflict	123/126	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	43	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	12-42440 12 days ago	37-49323 37 days ago	0-478 7 minutes
32744	NoneMore author:NoneMore	feat(ModelTheory/Definablity): add `DefinableFun` definition and lemmas	This PR adds two basic shapes of definable sets and `DefinableFun` definition with relevant lemmas. The main result is `Set.Definable.preimage_of_map` asserting that the preimage of a definable set under a definable map is definable. There are also some tool lemmas derived by the preimage lemma. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	147/0	Mathlib/ModelTheory/Definability.lean	1	60	['NoneMore', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	12-42320 12 days ago	12-42301 12 days ago	108-525 108 days
35910	LLaurance author:LLaurance	chore(Probability): remove deprecated items, shorten proofs	Remove deprecated items, shorten proofs, use dot notation where possible, style --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP merge-conflict	63/131	Mathlib/Probability/Distributions/Exponential.lean,Mathlib/Probability/Distributions/Gamma.lean,Mathlib/Probability/Distributions/Geometric.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/Probability/Distributions/Poisson/Basic.lean,Mathlib/Probability/Distributions/Uniform.lean	6	4	['LLaurance', 'github-actions', 'mathlib-merge-conflicts']	nobody	12-42318 12 days ago	26-73796 26 days ago	9-45370 9 days
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	253/260	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	139	10	['JovanGerb', 'Vierkantor', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	12-40787 12 days ago	13-24857 13 days ago	2-9741 2 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	16	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	b-mehta assignee:b-mehta	12-39672 12 days ago	12-39696 12 days ago	31-33506 31 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. - [ ] depends on: #34948 - [x] depends on: #34949 - [x] depends on: #34066 - [ ] depends on: #34079 - [ ] depends on: #34677 - [ ] depends on: #34678 - [ ] depends on: #34952 - [ ] 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	12-38164 12 days ago	unknown	0-0 0 seconds
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	25	['FrankieeW', 'eric-wieser', 'github-actions', 'riccardobrasca', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	12-34613 12 days ago	21-19903 21 days ago	7-10039 7 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 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	10	['Rob23oba', 'eric-wieser', 'github-actions', 'joelriou', 'joneugster', 'loefflerd']	joelriou assignee:joelriou	12-29862 12 days ago	12-50360 12 days ago	36-23157 36 days
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	12-26696 12 days ago	197-27054 197 days ago	18-38918 18 days
24383	YaelDillies author:YaelDillies	feat: distributive Haar characters of `ℝ` and `ℂ`	Compute `distribHaarChar` in the case of the actions of `ℝˣ` on `ℝ` and of `ℂˣ` on `ℂ`. The file I'm moving was added two days ago and is not yet used in FLT. From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI t-measure-probability file-removed FLT	211/80	Mathlib.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/Group/Action/BigOperators.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Complex.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Real.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	8	28	['YaelDillies', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	12-26259 12 days ago	334-40871 334 days ago	0-12994 3 hours
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']	joneugster assignee:joneugster	12-23533 12 days ago	12-23556 12 days ago	16-59622 16 days
36850	whocares-abt author:whocares-abt	feat(Combinatorics/SimpleGraph/Acyclic): add delete leaf from tree gives tree	Added theorem stating Deleting a leaf from a tree produces a tree.	t-combinatorics new-contributor	5/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['github-actions', 'vlad902']	nobody	12-22091 12 days ago	16-47079 16 days ago	18-29925 18 days
37026	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Nat/Perm): add two lemmas	If a finite type has at most two elements, then its permutation group is cyclic and commutative. --- - [x] depends on: #36983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	34/1	Mathlib/Data/Finite/Perm.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'tb65536']	nobody	12-21373 12 days ago	12-21383 12 days ago	13-83653 13 days
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	42/1	Mathlib/Combinatorics/SimpleGraph/Hasse.lean	1	13	['SnirBroshi', 'YaelDillies', 'github-actions', 'vihdzp', 'vlad902']	YaelDillies assignee:YaelDillies	12-21053 12 days ago	12-21053 12 days ago	63-66062 63 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	12-17651 12 days ago	12-17652 12 days ago	27-18698 27 days
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	534/15	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	6	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	12-16673 12 days ago	35-13059 35 days ago	0-316 5 minutes
37170	tb65536 author:tb65536	feat(RingTheory/Artinian/Module): add `pow` version of `quotNilradicalEquivPi`	This PR upgrades `IsArtinianRing.quotNilradicalEquivPi` and adds a `pow` version. --- [![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$	33/12	Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Spectrum/Maximal/Basic.lean	2	2	['github-actions', 'tb65536']	nobody	12-11373 12 days ago	12-11373 12 days ago	12-11364 12 days
37161	mike1729 author:mike1729	feat(Analysis/Normed/Module): add bornology and T2 instances for WeakSpace	Register the norm bornology on `WeakSpace 𝕜 E` and prove that it coincides with the von Neumann bornology of the weak topology. ### New declarations * `WeakSpace.instBornology`: norm bornology inherited from `E`. * `WeakSpace.instT2Space`: Hausdorff via Hahn–Banach separation. * `WeakSpace.norm_topology_le_weakSpace_topology`: the weak topology is coarser than the norm topology. * `WeakSpace.isBounded_iff_isVonNBounded`: norm-boundedness equals weak von Neumann boundedness (no `[CompleteSpace E]` needed). --- - [ ] depends on: #37027 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR new-contributor	322/113	Mathlib.lean,Mathlib/Analysis/LocallyConvex/WeakBilin.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/WeakSpace.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,Mathlib/Topology/Algebra/Module/WeakSpace.lean	6	3	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues']	nobody	12-6793 12 days ago	12-28987 12 days ago	0-50 50 seconds
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	12-6320 12 days ago	144-25255 144 days ago	0-1762 29 minutes
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	11-82828 11 days ago	32-78674 32 days ago	0-1216 20 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 label:t-algebra$	1441/17	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.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	13	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	11-73253 11 days ago	200-20319 200 days ago	0-13099 3 hours
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	11-71187 11 days ago	39-573 39 days ago	14-40819 14 days
36794	vihdzp author:vihdzp	doc(SetTheory/Ordinal/Principal): improve documentation	The module docstring now contains a description of what an `op`-principal actually is. I've also added some additional names for discoverability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory documentation	26/20	Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	2	8	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	alreadydone assignee:alreadydone	11-69802 11 days ago	16-70276 16 days ago	19-3069 19 days
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. - [ ] depends on: #33935 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR	580/0	Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Monoidal/Arrow.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	11-51401 11 days ago	11-53026 11 days ago	0-13 13 seconds
37197	dagurtomas author:dagurtomas	feat(Tactic/CategoryTheory): add support for specific functors in the map attribute	--- - [ ] depends on: #37183 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP LLM-generated t-meta blocked-by-other-PR	330/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/Map.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	11-51399 11 days ago	unknown	0-0 0 seconds
35600	yisiox author:yisiox	feat(Computability): add Kleene's algorithm to prove regular languages have regex matching	This PR adds a proof that every regular language has some regular expression matching it. This was achieved by the following constructions and proofs of their correctness - Define `toSingleεNFA` to transform any epsilon-NFA to an equivalent one with only a single start and accept state (and the type is `ExtendedState`) - Define a bijection between `ExtendedState` and `Fin (FinEnum.card (ExtendedState σ))` to index the states - Define `pathRegex` which implements Kleene's algorithm - Define `toRegex` which takes an epsilon-NFA, applies `toSingleεNFA` on it, and computes the corresponding regex using `pathRegex` The proofs of correctness chain together to yield `(toRegex M).matches' = M.accepts` which asserts the direction of Kleene's theorem required. --- As in [#mathlib4 > Regular languages: the review queue @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/near/573958148), this overlaps with #15654, which uses GNFA instead but has been inactive. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	492/0	Mathlib/Computability/EpsilonNFA.lean	1	15	['YaelDillies', 'github-actions', 'yisiox']	YaelDillies assignee:YaelDillies	11-45951 11 days ago	13-27115 13 days ago	32-29288 32 days
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$	1329/0	Mathlib.lean,Mathlib/Algebra/Module/SemilinearModuleProd.lean	2	1	['github-actions']	nobody	11-43506 11 days ago	unknown	0-0 0 seconds
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 submersions.	t-differential-geometry new-contributor	599/0	Mathlib.lean,Mathlib/Geometry/Manifold/Submersion.lean	2	4	['github-actions', 'grunweg']	PatrickMassot assignee:PatrickMassot	11-38525 11 days ago	11-38474 11 days ago	42-70801 42 days
33520	NoneMore author:NoneMore	feat(ModelTheory/ElementarySubstructures): add a variant of Tarski-Vaught test taking sets as input	There should exist an `ElementarySubstructure.copy` such that we can directly bundle the set itself instaed of its closure as an elementary substructure. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic new-contributor	91/0	Mathlib/ModelTheory/ElementarySubstructures.lean	1	3	['Citronhat', 'NoneMore', 'github-actions']	fpvandoorn assignee:fpvandoorn	11-38504 11 days ago	11-38568 11 days ago	93-30573 93 days
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 does not depend `Q(PartialOrder $α)`, and the constructors of `Strictness` now have their order typeclass arguments. In order to help `Qq` synth instances property, we have to move `assertInstancesCommute` to inner branch, manually add `haveI'` or explicitly pass the order typeclass instance into `.positive`/`.nonnegative`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	611/322	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/Module/Field.lean,Mathlib/Analysis/Complex/BorelCaratheodory.lean,Mathlib/Analysis/Complex/Order.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/DerivHyp.lean,Mathlib/Combinatorics/Enumerative/DyckWord.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/Totient.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean,Mathlib/NumberTheory/ArithmeticFunction/Zeta.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/Tactic/Positivity/Basic.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Positivity/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean	37	23	['HugLycan', 'JovanGerb', 'fpvandoorn', 'github-actions', 'joneugster']	JovanGerb assignee:JovanGerb	11-36558 11 days ago	18-40295 18 days ago	18-43403 18 days
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	74/0	Mathlib.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Hom.lean	3	5	['github-actions', 'joneugster', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	11-35515 11 days ago	38-74464 38 days ago	38-75078 38 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	83/0	Mathlib/RingTheory/Localization/Integral.lean	1	2	['github-actions']	nobody	11-33986 11 days ago	14-85630 14 days ago	0-881 14 minutes
36955	NoneMore author:NoneMore	chore(ModelTheory/Types): expose `T` in `typesWith` and move it to `Theory`	Make the `T : L.Theory` argument explicit in `typesWith` and place the definition in `FirstOrder.Language.Theory` to enable dot notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic new-contributor	24/19	Mathlib/ModelTheory/Topology/Types.lean,Mathlib/ModelTheory/Types.lean	2	2	['github-actions']	nobody	11-25734 11 days ago	16-16099 16 days ago	16-16089 16 days
34826	wwylele author:wwylele	feat(Geometry/Euclidean): volume of a simplex	WIP. sorry-free but still need cleaning up and breaking into smaller PRs --- - [ ] depends on: #34697 - [ ] depends on: #34858 - [ ] depends on: #34859 - [ ] depends on: #35039 - [ ] depends on: #35358 - [ ] depends on: #35365 - [ ] depends on: #35837 - [ ] depends on: #36018 - [ ] depends on: #36462 - [ ] depends on: #36466 - [ ] depends on: #36952 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	11-23067 11 days ago	unknown	0-0 0 seconds
36426	kim-em author:kim-em	chore: disable checkType env_linter	This PR disables the `checkType` env_linter, which takes ~44% of total linting time to type-check every declaration statement. This is redundant since all declarations are already type-checked when added to the environment, and external kernel checkers (lean4checker, trepplein) verify Mathlib regularly. No one on Zulip recalls ever seeing it fire in practice. 🤖 Prepared with Claude Code	LLM-generated t-linter awaiting-author	8/0	Mathlib/Init.lean	1	3	['JovanGerb', 'Vierkantor', 'github-actions']	alexjbest assignee:alexjbest	11-12709 11 days ago	11-12709 11 days ago	16-43405 16 days
36169	SnirBroshi author:SnirBroshi	feat(Order/ConditionallyCompleteLattice/Indexed): `iSup` of `sup`s vs `sup` of `iSup`s	`ciSup_sup_eq`/`ciInf_inf_eq` match `CompleteLattice`'s `iSup_sup_eq`/`iInf_inf_eq`, and in a `ConditionallyCompleteLinearOrder` we get an inequality without any bounded assumptions. `Finset.ciSup_union'` for `ConditionallyCompleteLinearOrderBot` matches `CompleteLattice`'s `Finset.iSup_union`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	39/0	Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	2	8	['SnirBroshi', 'Vierkantor', 'github-actions']	Vierkantor assignee:Vierkantor	11-11525 11 days ago	11-14353 11 days ago	21-38876 21 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	11-9048 11 days ago	17-12915 17 days ago	15-54679 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	11-7098 11 days ago	11-7098 11 days ago	52-18954 52 days
30666	erdOne author:erdOne	feat(NumberTheory): every number field has a ramified prime	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra awaiting-CI label:t-algebra$	261/10	Mathlib.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/RingTheory/DedekindDomain/Basic.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/KrullDimension/Basic.lean	12	33	['erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536', 'xroblot']	jcommelin assignee:jcommelin	11-1808 11 days ago	148-22106 148 days ago	13-79962 13 days
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	10-84830 10 days ago	10-84830 10 days ago	10-38227 10 days
36216	michaellee94 author:michaellee94	feat(CategoryTheory): characterize pullback squares via the `Over` category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor maintainer-merge awaiting-author	47/0	Mathlib/CategoryTheory/Limits/Shapes/Pullback/IsPullback/Basic.lean	1	18	['dagurtomas', 'github-actions', 'joelriou', 'michaellee94']	robin-carlier assignee:robin-carlier	10-84576 10 days ago	10-84576 10 days ago	2-50782 2 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	10-84039 10 days ago	121-23855 121 days ago	1-301 1 day
37240	thorimur author:thorimur	bench: get decls by decl range	For benching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import	42/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/TestLinter.lean	5	3	['github-actions', 'leanprover-radar', 'thorimur']	nobody	10-81390 10 days ago	unknown	0-0 0 seconds
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	75/7	Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean	3	1	['github-actions']	nobody	10-80911 10 days ago	10-80989 10 days ago	10-80979 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	10-80609 10 days ago	11-6642 11 days ago	0-588 9 minutes
37238	thorimur author:thorimur	bench: `getTopLevelDeclsByBody`	For benching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	42/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Lean/Elab/InfoTree.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/TestLinter.lean	6	3	['github-actions', 'leanprover-radar', 'thorimur']	nobody	10-80590 10 days ago	unknown	0-0 0 seconds
34077	kbuzzard author:kbuzzard	perf: increase priority of instSMulOfMul	#31040 deprecated `Mul.toSMul` in place of the core instance `instSMulOfMul`, which is at a lowered priority of 910. This PR undeprecates it and makes it a higher priority instance (1100) which seems better for mathlib. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This PR follows the philosophy seen in Mathlib's `Algebra.id : Algebra R R`, which also has raised priority. The idea is the same as `Algebra.id`: if you're looking for an instance of `Algebra R S` with R not equal to S then `Algebra.id` is extremely likely to fail quickly in practice, and if you're looking for an instance of `Algebra R R` then `Algebra.id` is unambiguously the right answer so should be tried ASAP. However the instance is defined so early in mathlib that in in practice it is tried last unless the priority is raised. The same philosophy holds here; if you're looking for an instance of `SMul X X` then you absolutely want to try `Mul.toSMul` first and if you're looking for an instance of `SMul X Y` with Y not X then `Mul.toSMul` will in practice be quick to fail. This PR was inspired by #33908 (another "this should be quick to fail and if it fits then it's almost certainly what we want" prio change) which made an instance of `IsScalarTower R A A` high priority and gave a performance boost. This PR also gives a performance boost. Note that the performance in #31040 looks very bad but the radar output is incorrect; there was a hardware change between the two runs. In fact #31040 produced no changes in profiling, as one might expect. I don't know the correct way to change the priority of a core instance in mathlib, and I didn't know if just changing the priority naively would work repo-wide rather than just file-wide, which was why this PR introduces a second instance. Zulip discussion at [#mathlib4 > priority hacks](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/priority.20hacks/with/574353616)	t-algebra awaiting-zulip label:t-algebra$	3/9	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Units.lean	2	26	['alreadydone', 'github-actions', 'kbuzzard', 'leanprover-radar', 'mathlib-merge-conflicts']	jcommelin assignee:jcommelin	10-79137 10 days ago	47-46232 47 days ago	0-58585 16 hours
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 - [ ] depends on: #33348 - [ ] 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/)	file-removed large-import blocked-by-other-PR t-algebra merge-conflict label:t-algebra$	3253/563	Mathlib.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/SpecialLinearGroup/Simple.lean,Mathlib/LinearAlgebra/Transvection.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	16	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-74432 10 days ago	83-21743 83 days ago	0-1083 18 minutes
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). --- - [ ] depends on: #33347 - [ ] depends on: #33348 - [ ] depends on: #33387 - [ ] depends on: #33282 - [ ] depends on: #33392 - [ ] depends on: #33402 - [ ] depends on: #33485 - [ ] 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 file-removed t-algebra merge-conflict label:t-algebra$	2854/559	Mathlib.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/LinearAlgebra/Basis/Fin.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Transvection.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	12	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-74431 10 days ago	84-21795 84 days ago	0-50 50 seconds
36891	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Exponential): characterization of `a ^ b = 1`	Used in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	12/0	Mathlib/SetTheory/Ordinal/Exponential.lean	1	6	['SnirBroshi', 'github-actions', 'vihdzp']	alreadydone assignee:alreadydone	10-69778 10 days ago	12-75714 12 days ago	17-44512 17 days
37235	gasparattila author:gasparattila	chore: do not tag `Measurable.prod` with `fun_prop`	This avoids relying on the bug where `fun_prop` unfolds semireducible definitions in the presence of projections (see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60fun_prop.60.20sometimes.20unfolds.20semireducible.20definitions/with/574596569) of the bug). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	6/1	Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean	2	1	['github-actions']	RemyDegenne assignee:RemyDegenne	10-69766 10 days ago	11-3712 11 days ago	11-3702 11 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'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic awaiting-author merge-conflict	161/136	Mathlib.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.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/Data/PFunctor/Multivariate/M.lean,Mathlib/Data/Quot.lean,Mathlib/FieldTheory/PerfectClosure.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	25	19	['SnirBroshi', 'Vierkantor', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'thorimur', 'vihdzp']	Vierkantor assignee:Vierkantor	10-63597 10 days ago	11-7572 11 days ago	61-68818 61 days
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	10-63351 10 days ago	101-6619 101 days ago	0-19130 5 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	2	['github-actions', 'mathlib-merge-conflicts']	nobody	10-60049 10 days ago	80-19629 80 days ago	0-13 13 seconds
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	305/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	72	['copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'grunweg', 'homeowmorphism', 'kbuzzard', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	nobody	10-60048 10 days ago	17-81534 17 days ago	0-4650 1 hour
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	10-59923 10 days ago	44-80441 44 days ago	0-18707 5 hours
36508	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): add FreeGroup instance	Add free group instances of finitely presented group and a helpful quotient `def` that says that quotienting a group by the normal closure of the empty set gives back the group. Use of AI: this was written by hand then golfed using GPT-5.4. --- - [ ] depends on: #34236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	293/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	12	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59919 10 days ago	25-67940 25 days ago	0-1907 31 minutes
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	10-59913 10 days ago	20-21850 20 days ago	0-56 56 seconds
36872	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): add trivial instance	--- - [ ] depends on: #34236 - [ ] depends on: #36508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	295/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	11	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59909 10 days ago	17-83254 17 days ago	0-460 7 minutes
36873	homeowmorphism author:homeowmorphism	feat(FinitelyPresentedGroup): Add multiplicative ℤ instance	--- - [ ] depends on: #34236 - [ ] depends on: #36508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor blocked-by-other-PR merge-conflict	298/0	Mathlib.lean,Mathlib/GroupTheory/FinitelyPresentedGroup.lean	2	11	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-59908 10 days ago	17-81701 17 days ago	0-1537 25 minutes
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	10-59906 10 days ago	17-5373 17 days ago	0-60 1 minute
37073	kim-em author:kim-em	feat: add normalize_instance% using core's normalizeInstance	This PR adds a new `normalize_instance%` term elaborator that delegates to Lean core's `normalizeInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `normalize_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.normalizeInstance`. 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	merge-conflict	88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/Order/Ring/StandardPart.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/NumberTheory/NumberField/InfiniteAdeleRing.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	18	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	10-59899 10 days ago	10-59900 10 days ago	2-73508 2 days
37131	IvanRenison author:IvanRenison	doc(Combinatorics/SimpleGraph/Partition): improve docstrings in `SimpleGraph.Partition`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	11/16	Mathlib/Combinatorics/SimpleGraph/Partition.lean	1	1	['github-actions']	nobody	10-56217 10 days ago	12-75228 12 days ago	12-75218 12 days
36938	kebekus author:kebekus	feat: Poisson Integral Formula for the circle average of `log ‖· - ρ‖`	Establish an analogue of the Poisson Integral Formula for the circle average of `log ‖· - ρ‖` along the circle with radius `‖ρ‖`. The result will be used to establish Poisson's generalization of the classic Jensen formula in complex analysis. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	234/0	Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Complex/Poisson.lean	2	9	['github-actions', 'kebekus', 'sgouezel']	sgouezel assignee:sgouezel	10-49119 10 days ago	10-49119 10 days ago	16-8278 16 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	1110/6	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.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/Independence/test.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Process/Filtration.lean	17	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-42911 10 days 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	7	['Blackfeather007', 'chrisflav', 'erdOne', 'github-actions', 'urkud']	erdOne assignee:erdOne	10-41449 10 days ago	99-84104 99 days ago	4-57005 4 days
37207	xroblot author:xroblot	feat(NumberTheory/DirichletCharacter/Basic): add subgroup of characters with conductor coprime to d	We add the following results for Dirichlet characters of level `n`: - `conductor_inv`: the conductor of `χ⁻¹` equals the conductor of `χ`. - `conductor_mul_dvd_lcm_conductor`: the conductor of `χ * ψ` divides `lcm(χ.conductor, ψ.conductor)`. - `subgroupOfCoprimeConductor`: the set of Dirichlet characters of level `n` whose conductor is coprime to `d` is a subgroup. --- - [ ] depends on: #37108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR	55/0	Mathlib/NumberTheory/DirichletCharacter/Basic.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-40319 10 days ago	11-38979 11 days ago	0-628 10 minutes
37244	tb65536 author:tb65536	chore(Algebra/Algebra/Basic): add `IsLocalHom (algebraMap R R)`	Experimentally, this seems to speed things up. --- [![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/Algebra/Basic.lean	1	4	['github-actions', 'leanprover-radar', 'tb65536']	nobody	10-38291 10 days ago	10-80626 10 days ago	10-80618 10 days
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 label:t-algebra$	732/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	9	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-37966 10 days ago	97-36163 97 days ago	0-705 11 minutes
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$	1184/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	9	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-37958 10 days ago	94-30029 94 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$	1297/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	9	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-37948 10 days ago	91-74250 91 days ago	0-1282 21 minutes
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$	1534/15	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean,Mathlib/LinearAlgebra/Transvection/SpecialLinearGroup.lean	7	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-37939 10 days ago	89-74384 89 days ago	0-93 1 minute
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	10-37049 10 days ago	259-84675 259 days ago	88-84229 88 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	10-36498 10 days ago	325-15203 325 days ago	43-17409 43 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	10-36329 10 days ago	unknown	0-0 0 seconds
32245	erdOne author:erdOne	feat(RingTheory): the `coassoc_simps` simp set	From Toric Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric t-meta	781/0	Mathlib.lean,Mathlib/RingTheory/Coalgebra/CoassocSimps.lean,Mathlib/Tactic/Attr/Register.lean,MathlibTest/RingTheory/CoassocSimps.lean	4	26	['Paul-Lez', 'YaelDillies', 'b-mehta', 'erdOne', 'github-actions', 'joneugster', 'riccardobrasca']	b-mehta assignee:b-mehta	10-35928 10 days ago	11-37093 11 days ago	43-41673 43 days
37267	xroblot author:xroblot	feat(NumberTheory/NumberField/Cyclotomic): cardinality of the subgroup of characters associated to an intermediate field equals its degree	New main result : `card_intermediateFieldEquivSubgroupChar`: the cardinality of the subgroup of Dirichlet characters of level `n` associated to an intermediate field `F` of `ℚ(ζₙ)/ℚ` equals the degree `[F : ℚ]`. --- - [ ] depends on: #34571 - [ ] depends on: #37108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	145/2	Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/MulChar/Duality.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean	6	2	['github-actions', 'mathlib-dependent-issues']	riccardobrasca assignee:riccardobrasca	10-33722 10 days ago	10-37174 10 days ago	0-47 47 seconds
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	10-31819 10 days ago	10-31869 10 days ago	27-59706 27 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	10-31812 10 days ago	17-13524 17 days ago	9-58085 9 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	1329/228	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/fun_prop2.lean,MathlibTest/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	24	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-29119 10 days ago	11-9430 11 days ago	0-432 7 minutes
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	10-27999 10 days ago	142-11258 142 days ago	72-63874 72 days
37059	thorimur author:thorimur	review: #36709	This review suggests - various improvements to the code structure + readability; pruning of unnecessary code - using `withCurrHeartbeats` instead of setting max heartbeats to 0 (and nothing at all in the `elabCommand` case, which should effectively start heartbeats afresh anyway) - not re-throwing `.internal` errors (does not touch unmodified sections of code that do the same) - hovers on names in the logged message + message newline fixes - another test, this time at the command level - `Name.lt` instead of `.quickLt` for human-readable sorting --- Targeting: https://github.com/leanprover-community/mathlib4/pull/36709 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	77/66	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	3	['SnirBroshi', 'github-actions', 'thorimur']	kim-em assignee:kim-em	10-24335 10 days ago	13-84073 13 days ago	13-84740 13 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	4	['YaelDillies', 'astrainfinita', 'bryangingechen', 'github-actions']	bryangingechen assignee:bryangingechen	10-21266 10 days ago	10-48958 10 days ago	2-78537 2 days
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	1711/252	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/fun_prop2.lean,MathlibTest/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	46	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-21200 10 days ago	10-30333 10 days ago	0-350 5 minutes
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	292/2	Mathlib/Combinatorics/SimpleGraph/Matching.lean	1	39	['JTylM', 'SnirBroshi', 'SproutSeeds', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	10-20830 10 days ago	18-22354 18 days ago	8-62228 8 days
35555	JovanGerb author:JovanGerb	perf: add `AddMonoid` shortcut instance for linear maps	The hierarchy of classes is such that `AddCommMonoid` is not a direct parent of `AddCommGroup`. This means that when unifying an instance that comes from `AddCommMonoid` with one that comes from `AddCommGroup`, we end up having to go through the shared parent `AddMonoid`. Hence, it can be beneficial to have a separately defined `AddMonoid` instance. It might be worth it to try to switch up the order of the parents of `AddCommGroup`/`CommGroup` in the `extends` clause, and see if that has beneficial effects. Though this will affect many things, and in particular won't interact well with the `backward.respectTransparency` mess that is going on at the moment. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated	22/7	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/Module/Multilinear/Basic.lean	4	11	['JovanGerb', 'github-actions', 'leanprover-radar', 'mathlib-bors', 'mathlib-merge-conflicts', 'mattrobball', 'robin-carlier']	robin-carlier assignee:robin-carlier	10-20620 10 days ago	10-43101 10 days ago	10-30622 10 days
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	10-17968 10 days ago	11-78481 11 days ago	0-1 1 second
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	214/0	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/AddSubMap.lean,Mathlib/NumberTheory/Height/EllipticCurve.lean	3	20	['MichaelStollBayreuth', 'Multramate', 'github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	10-17322 10 days ago	10-36815 10 days ago	13-27238 13 days
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	10-14886 10 days ago	10-15386 10 days ago	0-1 1 second
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	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	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-13830 10 days ago	21-21616 21 days ago	0-48 48 seconds
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	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	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-9996 10 days ago	14-34745 14 days ago	0-323 5 minutes
36401	JovanGerb author:JovanGerb	feat(positivity): positivity extension for `a - b`	This PR adds support in `positivity` for proving things about subtraction. For example, if the goal is `0 < a - b`, and there is a local hypothesis of type `b < a`, then we close the goal. The motivation is that we want `positivity` to be a flexible tactic. So, when trying to prove `0 < a - b` using a local hypothesis, we should look for the simp normal form of this, which is `b < a`. --- [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Can.20I.20make.20positivity.20work.20for.20this.3F/near/578277240) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-zulip	63/26	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/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Tactic/Positivity/Basic.lean,MathlibTest/positivity.lean	10	8	['JovanGerb', 'github-actions', 'hrmacbeth', 'j-loreaux', 'joneugster', 'leanprover-radar']	joneugster assignee:joneugster	10-7933 10 days ago	10-21741 10 days ago	17-57303 17 days
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	10-7484 10 days ago	126-72652 126 days ago	0-2910 48 minutes
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	318/2	Mathlib.lean,Mathlib/Geometry/Euclidean/Incenter.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	10-7473 10 days ago	134-66372 134 days ago	0-1725 28 minutes
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	218/2	Mathlib.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean	3	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot']	nobody	10-7470 10 days ago	136-27662 136 days ago	0-313 5 minutes
35473	mike1729 author:mike1729	feat(Analysis/Normed/Module): Schauder bases, basic sequences, and the Eberlein–Šmulian theorem	This PR develops the theory of Schauder bases and basic sequences in Banach spaces, culminating in a proof of the Eberlein–Šmulian theorem: in a Banach space, a weakly countably compact set is weakly compact (and weakly sequentially compact). Note: This PR is too large to review in one go. It will be split into smaller parts and merged incrementally. The first part is already under review: The proof follows the basic-sequence approach of Pełczyński, as presented in Albiac–Kalton Topics in Banach Space Theory (2016). The main line of argument is: 1. Define generalized Schauder bases (indexed by arbitrary types with a summation filter) and the classical sequential Schauder basis as a special case. 2. Introduce basic sequences and their characterization via the Grünblum condition. 3. Prove the selection principle: extract basic sequences from sets where the weak and norm closures disagree (via a perturbation/finite-dimensional compactness argument in the dual). 4. Show that a bounded set containing no basic sequence has relatively weakly compact closure. 5. Combine these ingredients to prove both directions of the Eberlein–Šmulian theorem. ## Main definitions * `GeneralSchauderBasis β 𝕜 X L`: A Schauder basis for a normed space `X` over `𝕜`, indexed by a type `β` with a `SummationFilter L`. Unifies classical (sequential) and unconditional bases. * `BasicSequence 𝕜 X`: A bundled ℕ-indexed sequence forming a Schauder basis for its closed linear span. ## Main results * `isBasicSequence_of_Grunblum_with_bound`: A nonzero sequence satisfying the Grünblum condition is a basic sequence, with explicit basis constant bound. * `basic_sequence_selection_dual`: Extracts a basic sequence from a set that is weak-dense near 0 but norm-separated from 0. `exists_basicSequence_of_weakClosure_not_normClosure`: If 0 is in the weak closure of `S` but not its norm closure, then `S` contains a basic sequence. * `schauderBasisOfClosure`: Constructs a Schauder basis for the topological closure from a basis on a subspace. * `no_basic_sequence_implies_relatively_weakly_compact`: A bounded set with no basic sequence has weakly compact closure. * `eberlein_smulian_isSeqCompact`: A weakly countably compact set in a Banach space is weakly sequentially compact. * `eberlein_smulian`: Eberlein–Šmulian theorem. A weakly countably compact set in a Banach space is weakly compact. * `IsCompact.frechetUrysohnSpace`: Weakly compact subsets of a Banach space are Fréchet–Urysohn (angelic). ## References * [F. Albiac, N.J. Kalton, Topics in Banach Space Theory, Springer, 2016][albiac2016] * I. Singer, Bases in Banach Spaces, 1970. --- - [x] depends on: #34209 - [x] depends on: #35559 - [x] depends on: #36174 - [ ] depends on: #36849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis new-contributor blocked-by-other-PR	2691/0	Mathlib.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/Basic.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/BasicSequence.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/BasicSequenceSelection.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/Closure.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/CountablyCompact.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/EberleinSmulian.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/NoBasicSequence.lean	8	6	['CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mike1729']	nobody	10-4025 10 days ago	unknown	0-0 0 seconds
33010	xgenereux author:xgenereux	feat: localizations of primes in Dedekind domains are valuation subrings	The goal of this PR is the theorem `valuationSubringAtPrime_eq_valuationSubring` which states that the localization at a nonzero prime in a Dedekind domain is precisely the valuation subring of the valuation associated with that same prime. Given a Dedekind domain `R` in its field of fractions `K`, we define `IsDedekindDomain.valuationSubringAtPrime`, which is the localization of `R` at a nonzero prime, viewed as valuation subring of `K`. We show that `valuationSubringAtPrime K v ≤ (valuation K v).valuationSubring` and use maximality to show that they must be equal. Other small note: - added a variant of `intValuation_exists_uniformizer` in terms of `valuation` (instead of intValuation). Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #33631 - [ ] depends on: #33634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	68/6	Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	1	11	['erdOne', 'github-actions', 'mathlib-dependent-issues', 'xgenereux']	nobody	10-3183 10 days ago	10-3153 10 days ago	12-37263 12 days
34481	DAE123456 author:DAE123456	feat: Ore's Theorem	Ore Theorem : Let G be a graph of order n ≥ 3 that satisfies the Ore property. Then G has a Hamilton cycle.	t-combinatorics new-contributor awaiting-author	3372/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Ore.lean	2	31	['DAE123456', 'LLaurance', 'Ruben-VandeVelde', 'SnirBroshi', 'YaelDillies', 'github-actions', 'kim-em', 'tb65536', 'vlad902']	YaelDillies and kmill assignee:kmill assignee:YaelDillies	10-892 10 days ago	10-50478 10 days ago	56-39391 56 days
34571	xroblot author:xroblot	feat(CyclotomicField/Galois): the bijection between subfields and subgroups of Dirichlet characters	This PR adds the first results relating the Galois theory of cyclotomic extensions to Dirichlet characters, following Washington, _Introduction to Cyclotomic Fields_. The main result is the definition of the order-preserving bijection between intermediate fields of `ℚ(ζₙ)/ℚ` and subgroups of the group of Dirichlet characters of level `n`. --- - [x] depends on: #33878 - [ ] depends on: #37108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR merge-conflict label:t-algebra$	102/1	Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean	3	7	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	dagurtomas assignee:dagurtomas	10-174 10 days ago	13-10953 13 days ago	14-21602 14 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	9-84960 9 days ago	21-62665 21 days ago	0-1003 16 minutes
37051	gasparattila author:gasparattila	chore(Data/Set/Finite/Lattice): use `to_dual`	--- - [ ] depends on: #37047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	138/534	Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Data/ENNReal/Lemmas.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Set/Finite/Lattice.lean,Mathlib/Order/CompleteBooleanAlgebra.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-84950 9 days ago	14-8609 14 days ago	0-733 12 minutes
37052	gasparattila author:gasparattila	chore(Data/Finset/Lattice/Prod): use `to_dual`	--- - [ ] depends on: #37047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	136/557	Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Data/ENNReal/Lemmas.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Prod.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-84949 9 days ago	14-6869 14 days ago	0-292 4 minutes
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. --- - [ ] depends on: #37047 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	170/505	Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean,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/Defs.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	14	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-84947 9 days ago	11-78087 11 days ago	0-326 5 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	9-77504 9 days ago	10-50307 10 days ago	0-26623 7 hours
37291	IvanRenison author:IvanRenison	refactor(Combinatorics/SimpleGraph): move `chromaticNumber_le_two_iff_isBipartite` and `chromaticNumber_eq_two_iff` to `Bipartite` file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	10/12	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	2	1	['github-actions']	nobody	9-76671 9 days ago	9-76758 9 days ago	9-76748 9 days
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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	213/0	Mathlib.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/RingTheory/Ideal/Galois.lean	3	8	['github-actions', 'riccardobrasca', 'tb65536', 'xroblot']	erdOne and riccardobrasca assignee:riccardobrasca assignee:erdOne	9-75889 9 days ago	25-9450 25 days ago	25-9440 25 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	602/259	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	56	2	['github-actions', 'mathlib-merge-conflicts']	nobody	9-72950 9 days ago	77-58523 77 days ago	0-20 20 seconds
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	134/114	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	4	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-merge-conflicts']	nobody	9-71976 9 days ago	9-71999 9 days ago	10-78793 10 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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge	15/12	Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Geometry/Convex/Cone/Pointed.lean	2	3	['YaelDillies', 'github-actions']	nobody	9-71887 9 days ago	11-63104 11 days ago	12-36738 12 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	159/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Sphere/PolePolar.lean	2	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	JovanGerb assignee:JovanGerb	9-69917 9 days ago	10-7469 10 days ago	10-8219 10 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']	JovanGerb assignee:JovanGerb	9-69916 9 days ago	10-7483 10 days ago	10-8263 10 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	43/0	Mathlib/Data/Sym/Sym2.lean	1	8	['SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	TwoFX and pechersky assignee:TwoFX assignee:pechersky	9-69914 9 days ago	16-74510 16 days ago	59-34192 59 days
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	854/0	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	9-69527 9 days ago	27-16274 27 days ago	14-50302 14 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/) - [ ] depends on: #36386	t-algebra new-contributor blocked-by-other-PR label:t-algebra$	4044/0	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,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,docs/references.bib	14	16	['Hagb', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-65533 9 days ago	28-60523 28 days ago	3-55474 3 days
37237	thorimur author:thorimur	bench: `getDeclsByBody`	For benching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import	65/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/TestLinter.lean	5	11	['github-actions', 'leanprover-radar', 'thorimur']	nobody	9-63572 9 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	237/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Braided/Traced.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Traced.lean,docs/references.bib	4	4	['dagurtomas', 'github-actions', 'matthunz']	nobody	9-59636 9 days ago	18-862 18 days ago	0-25956 7 hours
37214	Kha author:Kha	perf(Tactic/Abel): use `mkAuxTheorem` for proof term	Removes some duplication from types of nested proofs	t-meta	4/1	Mathlib/Tactic/Abel.lean	1	5	['JovanGerb', 'Kha', 'github-actions', 'leanprover-radar']	thorimur assignee:thorimur	9-33038 9 days ago	11-18409 11 days ago	11-18399 11 days
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.	t-topology new-contributor LLM-generated	269/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Algebra/Order/PiecewiseLinear.lean	3	8	['Vilin97', 'copilot-pull-request-reviewer', 'dagurtomas', 'github-actions', 'wwylele']	PatrickMassot assignee:PatrickMassot	9-14409 9 days ago	10-15275 10 days ago	18-45346 18 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	312/260	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	142	5	['adomani', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	9-4723 9 days ago	23-34614 23 days ago	0-45 45 seconds
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 `R`-modules `M` and `N` and a set `s` in `M`, `Submodule.dual p s` is the submodule in `N` consisting of all points `y` such that `0 = p x y` for all `x ∈ s`. 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	5	['github-actions', 'joelriou', 'martinwintermath']	joelriou assignee:joelriou	9-3456 9 days ago	66-3069 66 days ago	14-81375 14 days
37318	JovanGerb author:JovanGerb	chore(LinearAlgebra/Complex/Module): add `Algebra ℝ ℂ` shortcut instance	As suggested by Kevin: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/linter.20for.20instance.20diamonds/near/582324014 This help make sure that we get the "right" instance. However, ideally we would want to fix the problem of having "wrong" instances in the first place. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		3/2	Mathlib/Analysis/Complex/Basic.lean,Mathlib/LinearAlgebra/Complex/Module.lean	2	1	['github-actions']	nobody	9-1474 9 days ago	9-1060 9 days ago	0-1036 17 minutes
37047	gasparattila author:gasparattila	chore(Data/Finset/Lattice/Fold): use `to_dual`	This PR uses the `@[to_dual]` attribute to generate dual lemmas about `Finset.sup`. The lemmas about `sdiff` and `himp` are skipped, as `HeytingAlgebra` is not yet tagged with `@[to_dual]`. To improve the consistency between dual lemmas, several changes are made: - tag `inf_insert` with `@[grind =]` - rename `le_inf_const_le` to `le_inf_const` - tag `inf_union` with `@[grind _=_]` - tag `inf_mono_fun` with `@[grind ←]` - tag `inf_mono` with `@[grind ←]` - tag `inf_attach` with `@[simp]` - add `le_inf_of_directed_le` - add `inf_eq_top_of_isEmpty` - add `inf_mem_of_nonempty` - add `inf'_mono_fun` - rename `comp_sup_eq_sup_comp_of_nonempty` to `apply_sup_eq_sup_comp_of_nonempty` and add `apply_inf_eq_inf_comp_of_nonempty` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	126/477	Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean,Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Finset/Lattice/Fold.lean	4	14	['JovanGerb', 'gasparattila', 'github-actions', 'mathlib-merge-conflicts']	joneugster assignee:joneugster	8-69686 8 days ago	9-82194 9 days ago	14-7496 14 days
37084	SnirBroshi author:SnirBroshi	feat(Order/PropInstances): relations and `Subsingleton`	`r = ⊤ ↔ Refl r` and `r = ⊥ ↔ Irrefl r` given `Subsingleton` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	7/1	Mathlib/Order/PropInstances.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	8-69685 8 days ago	13-39956 13 days ago	13-39946 13 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	8-59748 8 days ago	11-52438 11 days ago	74-58112 74 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	8-55458 8 days ago	8-55459 8 days ago	59-67698 59 days
34808	YaelDillies author:YaelDillies	feat(Combinatorics/SimpleGraph): isolated vertices	From ProofBench --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	37/1	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	3	5	['YaelDillies', 'b-mehta', 'github-actions']	b-mehta assignee:b-mehta	8-46935 8 days ago	8-46986 8 days ago	60-23448 60 days
35613	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Clique): use `IsContained` instead of an explicit embedding from top	This makes theorems require only a proof that a `Copy` exists rather than provide an explicit `Embedding`. Also tag monotonicity lemmas with `@[gcongr]`, and add `Copy.isContained` / `Embedding.isIndContained` / `Embedding.isContained` / `Iso.isContained'`. --- This isn't a generalization per-se since one could use choice plus `Copy.topEmbedding` to upgrade the `IsContained` to an embedding, but `IsContained` makes more sense in theorems. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	65/55	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	4	21	['SnirBroshi', 'YaelDillies', 'github-actions']	awainverse assignee:awainverse	8-32333 8 days ago	14-24712 14 days ago	38-6995 38 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	87/73	.github/workflows/add_label_from_diff.yaml,scripts/autolabel.lean	2	4	['github-actions', 'mathlib-merge-conflicts']	adomani assignee:adomani	8-30246 8 days ago	8-30529 8 days ago	40-71859 40 days
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	8-29428 8 days ago	32-73983 32 days ago	0-1847 30 minutes
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 merge-conflict t-topology	527/0	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	5	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-29403 8 days ago	33-15231 33 days ago	0-4550 1 hour
34703	martinwintermath author:martinwintermath	Generalizing orthogonalBilin	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	51/25	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	3	1	['github-actions']	nobody	8-24813 8 days ago	unknown	0-0 0 seconds
35976	Phelixh author:Phelixh	feat: add add Liu's uncertainty theory foundations (core/distribution/process modules)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	2374/0	Mathlib.lean,Mathlib/Uncertainty/Base.lean,Mathlib/Uncertainty/BaseCore.lean,Mathlib/Uncertainty/BaseDistribution.lean,Mathlib/Uncertainty/BaseProcess.lean,Mathlib/Uncertainty/Uncertainty.lean	6	26	['Phelixh', 'copilot-pull-request-reviewer', 'github-actions']	nobody	8-22351 8 days ago	8-22418 8 days ago	8-27705 8 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	221/232	Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean	2	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	8-17248 8 days ago	8-17272 8 days ago	9-49478 9 days
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 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: some API issues need to be decided, some slow proofs need to be diagnosed, some documentation needs to be improved, and may adjust variable names/ theorem names/notation. - [x] depends on: #36279 - [x] depends on: #34263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry	296/0	Mathlib.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Metric.lean	3	20	['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'sgouezel']	nobody	8-15806 8 days ago	30-79485 30 days ago	0-10 10 seconds
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	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	2	['github-actions', 'mathlib-dependent-issues']	nobody	8-15586 8 days ago	18-38647 18 days ago	0-512 8 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	57/0	Mathlib.lean,Mathlib/Logic/Small/Basic.lean,Mathlib/SetTheory/Cardinal/EventuallyConst.lean	3	3	['github-actions', 'vihdzp', 'wwylele']	nobody	8-1255 8 days ago	8-3800 8 days ago	8-5949 8 days
36907	nielstron author:nielstron	feat(Computability/ContextFreeGrammar): Make reversal closure an iff	--- Makes the reversal closure of CFGs a simp iff theorem, matching the way it is [handled in NFAs](https://github.com/leanprover-community/mathlib4/blob/1f3cdaa7a7f82a2e521d285b11e261110e1e1962/Mathlib/Computability/NFA.lean#L424-L425) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-computability awaiting-author	14/2	Mathlib/Computability/ContextFreeGrammar.lean	1	14	['github-actions', 'leanprover-radar', 'nielstron', 'plp127']	nobody	8-176 8 days ago	9-12327 9 days ago	1-25411 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']	JovanGerb assignee:JovanGerb	7-86349 7 days ago	10-7480 10 days ago	10-8206 10 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']	jsm28 assignee:jsm28	7-86219 7 days ago	40-9382 40 days ago	42-43658 42 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']	b-mehta assignee:b-mehta	7-85079 7 days ago	83-634 83 days ago	83-624 83 days
36087	matthewjasper author:matthewjasper	chore: fix diamonds for Real/Complex Algebra instances	Unfold or make `implicit_reducible` some definitions used to define `Algebra ℝ ℂ` . This should allow reducing use of `set_option backward.isDefEq.respectTransparency false`. --- - [x] depends on: #36694 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	24/19	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/LinearAlgebra/Complex/Module.lean,MathlibTest/instance_diamonds.lean	7	8	['eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'matthewjasper']	eric-wieser assignee:eric-wieser	7-80243 7 days ago	9-9199 9 days ago	11-84307 11 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	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	59	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'wwylele']	nobody	7-75748 7 days ago	9-78716 9 days ago	14-69931 14 days
37354	SnirBroshi author:SnirBroshi	feat(Order/Defs/PartialOrder): `(a < b ↔ b < a) ↔ (a ≤ b ↔ b ≤ a)` in `Preorder`s	Relate the predicates {`a < b`, `b < a`, `a ≤ b`, `b ≤ a`}. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	12/0	Mathlib/Order/Defs/PartialOrder.lean	1	1	['github-actions']	nobody	7-62686 7 days ago	7-62440 7 days ago	7-64113 7 days
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	452/493	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	80	43	['JovanGerb', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	pechersky and vihdzp assignee:pechersky assignee:vihdzp	7-59541 7 days ago	9-80777 9 days ago	13-79166 13 days
37357	thorimur author:thorimur	bench: declRange experiment	For benching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	63/36	Mathlib/Tactic/Linter/UnusedInstancesInType.lean	1	5	['github-actions', 'leanprover-radar', 'thorimur']	nobody	7-52890 7 days 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/)		10/42	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	2	['github-actions', 'mathlib-merge-conflicts']	nobody	7-43181 7 days ago	7-43206 7 days ago	20-18961 20 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	33/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean	1	5	['github-actions', 'grunweg', 'themathqueen']	nobody	7-42188 7 days ago	10-11406 10 days ago	0-432 7 minutes
37038	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: #37037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	443/0	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-39498 7 days ago	14-23072 14 days ago	0-1312 21 minutes
37359	EtienneC30 author:EtienneC30	chore: deprecate module HasIndepIncrements	This was changed to `HasIndepIncrements.Basic` in #36745. --- - [ ] depends on: #36745 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	294/124	Mathlib.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/IsGaussianProcess.lean	6	2	['github-actions', 'mathlib-dependent-issues']	nobody	7-39325 7 days ago	7-39326 7 days ago	0-1422 23 minutes
36419	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/DividedPowerAlgebra/Init): add a computation lemma	Add a lemma `DividedPowerAlgebra.pow_dp`. Co-authored with: @mariainesdff --- - [x] depends on: #35804 - [ ] depends on: #35830 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	128/1	Mathlib/Data/List/ToFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/DividedPowerAlgebra/Init.lean	3	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-34885 7 days ago	27-77480 27 days ago	0-1764 29 minutes
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	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	33	['faenuccio', 'github-actions', 'jjdishere', 'leanprover-radar', 'mathlib-bors', 'riccardobrasca', 'wwylele']	faenuccio and riccardobrasca assignee:riccardobrasca assignee:faenuccio	7-32623 7 days ago	7-32623 7 days ago	11-64422 11 days
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`. --- - [ ] depends on: #36745 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability blocked-by-other-PR	872/126	Mathlib.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/Probability/BrownianMotion/Basic.lean,Mathlib/Probability/BrownianMotion/GaussianProjectiveFamily.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/IsGaussianProcess.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/Covariance.lean	13	2	['github-actions', 'mathlib-dependent-issues']	nobody	7-28735 7 days ago	19-35547 19 days ago	0-1346 22 minutes
37343	xgenereux author:xgenereux	feat: add coe instances for spectrums	This PR adds `Coe` instances for the type `PrimeSpectrum` and similar. For `P: PrimeSpectrum`, this means that when lean expects `Ideal A`, we can directly write `P : Ideal A` instead of `P.asIdeal`. The `.asIdeal` gets inserted automatically. At the moment, I haven't set up the `@[coe]` to make delab into `↑P` - it simply shows `P.asIdeal` in the infoview. If we want the `↑P` I can add it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	9/0	Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/Spectrum/Maximal/Defs.lean,Mathlib/RingTheory/Spectrum/Prime/Defs.lean	3	2	['faenuccio', 'github-actions']	faenuccio assignee:faenuccio	7-28030 7 days ago	8-6172 8 days ago	8-6162 8 days
36592	Vierkantor author:Vierkantor	chore(Tactic): rewrite `introv` tactic docstring	This PR rewrites the docstrings for the `introv` tactic, to consistently match the official style guide, to make sure they are complete while not getting too long. In particular, I wanted to clarify exactly what `introv` does and does not introduce, depending on the list of names given to it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation t-meta	22/19	Mathlib/Tactic/Basic.lean	1	10	['Vierkantor', 'dwrensha', 'github-actions', 'joneugster']	dwrensha assignee:dwrensha	7-21471 7 days ago	7-21471 7 days ago	21-33685 21 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	4	['faenuccio', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	faenuccio assignee:faenuccio	7-20359 7 days ago	7-20359 7 days ago	18-25760 18 days
37373	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Sum): add `LocallyFinite (G ⊕g H)` instance	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	11/0	Mathlib/Combinatorics/SimpleGraph/Sum.lean	1	3	['SnirBroshi', 'github-actions', 'themathqueen']	nobody	7-18332 7 days ago	7-21815 7 days ago	7-21805 7 days
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	169/0	Mathlib.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/GlobalSyntax.lean	4	5	['adomani', 'bryangingechen', 'github-actions', 'mathlib-splicebot']	nobody	7-15184 7 days 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	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	7-11771 7 days ago	74-72382 74 days ago	0-34 34 seconds
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	7	['SnirBroshi', 'TwoFX', 'eric-wieser', 'github-actions', 'linesthatinterlace', 'mathlib-merge-conflicts']	TwoFX assignee:TwoFX	7-10962 7 days ago	130-44833 130 days ago	35-84279 35 days
36283	Vierkantor author:Vierkantor	chore(Tactic/GRewrite): rewrite `grw` family tactic docstrings	This PR rewrites the docstrings for tactics in the `grw` family: `grw`, `grewrite`, `apply_rw`, `apply_rewrite`, `nth_rw` and `nth_rewrite`, to consistently match the official style guide, to make sure they are complete while not getting too long. The `grw` tactic docstring was nice and complete, but the others were very brief and needed expansion (especially since it took me quite some time to understand the motivation behind `apply_rw`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation t-meta	150/23	Mathlib/Tactic/GRewrite/Elab.lean	1	20	['JovanGerb', 'Vierkantor', 'github-actions', 'joneugster']	adamtopaz assignee:adamtopaz	7-9214 7 days ago	7-23754 7 days ago	28-16978 28 days
37071	ericluap author:ericluap	feat: Dedekind completion of rationals is isomorphic to EReal		t-order new-contributor awaiting-author	96/0	Mathlib.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/EReal/DedekindCut.lean	3	36	['ericluap', 'github-actions', 'vihdzp', 'wwylele']	vihdzp assignee:vihdzp	7-7191 7 days ago	7-7191 7 days ago	5-74712 5 days
35830	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Nat/Choose/Multinomial): multinomial coefficients	Define the multinomial coefficients, a variant of `Nat.multinomial`. - redefine `Multiset.multinomial`. Given a multiset `m` of natural numbers, `m.multinomial` is the multinomial coefficient defined by (m.sum) ! / ∏ i ∈ m, m i !. As an example, `Multiset.multinomial {1, 2, 2} = 30`. This is the exponent of $x y^2 z^2$ in $(x+y+z)^5$. This should not be confused with the existing `Multiset.multinomial` which gives a different answer, for example, `Multiset.multinomial {1, 2, 2} = 3`. This function is renamed as `Multiset.countPerms`. - `Multiset.multinomial_cons` proves that `(x ::ₘ m).multinomial = Nat.choose (x + m.sum) x * m.multinomial` - `Multiset.multinomial_add` proves that `(m + m').multinomial = Nat.choose (m + m').sum m.sum * m.multinomial * m'.multinomial` co-authored with @mariainesdff --- - [x] depends on: #36611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data blocked-by-core-release	122/1	Mathlib/Data/List/ToFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean	2	25	['AntoineChambert-Loir', 'github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	joneugster assignee:joneugster	7-3196 7 days ago	7-34766 7 days ago	27-74956 27 days
35674	astrainfinita author:astrainfinita	refactor: use `OrderSupInfSet` in `ConditionallyCompleteLattice`	--- - [x] depends on: #35774 - [x] depends on: #37079 - [ ] depends on: #37082 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR merge-conflict	398/237	Mathlib/Algebra/Order/Nonneg/Lattice.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Data/Int/ConditionallyCompleteOrder.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Real/Archimedean.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/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/Topology/NoetherianSpace.lean	23	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-1365 7 days ago	unknown	0-0 0 seconds
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	6-79281 6 days ago	41-6636 41 days ago	8-27645 8 days
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	6-77909 6 days ago	45-56264 45 days ago	0-405 6 minutes
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	6-76140 6 days ago	6-76140 6 days ago	22-25229 22 days
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	6-73683 6 days ago	24-73799 24 days ago	0-153 2 minutes
36604	JovanGerb author:JovanGerb	feat(Translate): reorder universes	This PR improves the heuristic for reordering of universes in `to_dual`/`to_additive`. The previous heuristic worked well when the first two universes had to be swapped. For example for translating `a ^ n` to `n • a`, and for dualizing `GaloisConnection`. However, in Category theory we sometimes need to swap more universes because a category instance comes with 2 universes which both need to be swapped. In particular, the comma category, and adjunctions both need this feature. This PR doesn't add any syntax for specifying the reordering of universes. It is assumed that the universe reordering can always be inferred from the normal reordering and from the type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	204/91	Mathlib/CategoryTheory/Comma/Basic.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Translate/Reorder.lean,MathlibTest/ToDual.lean	4	7	['JovanGerb', 'bryangingechen', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	6-71080 6 days ago	6-71139 6 days ago	12-67061 12 days
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$	271/177	Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean	4	17	['github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	joelriou assignee:joelriou	6-69769 6 days ago	8-60621 8 days ago	8-60611 8 days
36745	EtienneC30 author:EtienneC30	feat: a process with independent increments and Gaussian marginals is Gaussian	The new file only provides one public declaration that corresponds to the title of the PR. The rest of the file is an implementation detail to show that the finite dimensional marginals of a process can be written as a linear map of the increments. --- - [x] depends on: #36674 - [x] depends on: #36718 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability file-removed	160/1	Mathlib.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/HasGaussianLaw/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/Basic.lean,Mathlib/Probability/Independence/Process/HasIndepIncrements/IsGaussianProcess.lean	5	2	['github-actions', 'mathlib-dependent-issues']	RemyDegenne assignee:RemyDegenne	6-69766 6 days ago	7-39264 7 days ago	7-39588 7 days
37175	tb65536 author:tb65536	chore(GroupTheory/Nilpotent): move declarations into namespace	This PR moves the declarations of `GroupTheory/Nilpotent` from the root namespace to either the `Subgroup` namespace or the `Group` namespace. I also switched over to the commutator element notation in a few places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-group-theory label:t-algebra$	194/34	Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	4	1	['github-actions']	mattrobball assignee:mattrobball	6-69760 6 days ago	12-3082 12 days ago	12-3074 12 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`. --- - [ ] depends on: #34742 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR t-category-theory	268/3	Mathlib.lean,Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/CategoryTheory/Sites/Abelian.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/ExactSequences.lean	5	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	6-61874 6 days ago	32-4616 32 days ago	0-32 32 seconds
34742	Brian-Nugent author:Brian-Nugent	feat(SheafCohomology): add API for Sheaf Cohomology	Defines the long exact sequence on cohomology associated to a short exact sequence of sheaves `H.longSequence`. Also defines `H.equiv₀`, the additive equivalence between `H F 0` and `((sheafSections J AddCommGrpCat).obj (op T)).obj F` when the category has a terminal object `T`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	87/3	Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/CategoryTheory/Sites/Abelian.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean	3	33	['Brian-Nugent', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou', 'joneugster', 'mathlib-merge-conflicts']	adamtopaz assignee:adamtopaz	6-61621 6 days ago	16-6481 16 days ago	54-53926 54 days
35415	joneugster author:joneugster	feat(Cache): enable partial cache in downstream projects	Migrated to fork from: #21238. Add features to `cache` and cleanup code: * 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 merge-conflict	34/15	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	6-49123 6 days ago	6-49124 6 days ago	34-10038 34 days
35865	vihdzp author:vihdzp	chore: review `Cardinal.ord` API	This PR does the following: - Mark `Cardinal.ord` as no expose. - Prove the defining property `gciOrdCard` earlier. - Deprecate the unused `ord.orderEmbedding` (it simply restates that the function is strictly monotonic). - Rename `ord_nat` → `ord_natCast`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	41/37	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean	3	5	['github-actions', 'mathlib-merge-conflicts']	alreadydone assignee:alreadydone	6-48907 6 days ago	6-48806 6 days ago	33-82061 33 days
37405	Paul-Lez author:Paul-Lez	feat(Mathlib/Algebra/BigOperators/Fin): lemma about List.ofFn	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI label:t-algebra$	6/0	Mathlib/Algebra/BigOperators/Fin.lean	1	1	['github-actions']	nobody	6-46085 6 days ago	6-46408 6 days ago	0-17 17 seconds
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	1	['github-actions']	nobody	6-44731 6 days ago	6-44807 6 days ago	6-44797 6 days
37411	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): introduce `Monomial`	* Introduce `Monomial` and `UnitMonomial` * Define `Monomial.toFun` and algebraic operations on monomials: negation, inversion, multiplication. --- - [ ] depends on: #37414 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 blocked-by-other-PR	327/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Predicates.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	6-41383 6 days ago	6-44035 6 days ago	0-1093 18 minutes
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. --- - [ ] 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/)	blocked-by-other-PR t-meta	709/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Predicates.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	6-41360 6 days ago	6-44004 6 days ago	0-224 3 minutes
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. --- - [x] depends on: #36877 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	209/169	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	4	['CoolRmal', 'github-actions', 'mathlib-dependent-issues']	nobody	6-37177 6 days ago	17-53347 17 days ago	0-331 5 minutes
37060	pfaffelh author:pfaffelh	feat: `Set.indicator` on a disjoint union equals the sum of individual `Set.indicator`	Prove a helper lemma on mulIndicators, needed in measure/probability theory: If `s : γ → Set β` is `Pairwise (Disjoint on s)` and `f : β → α`, then `(⋃ d, s d).mulIndicator f i = ∏' d, (s d).mulIndicator f i` for `i : β`. The `to_additive` tag is added for `Set.indicator`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	57/1	Mathlib/Algebra/Group/Indicator.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	2	30	['DavidLedvinka', 'github-actions', 'mathlib-bors', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	6-36340 6 days ago	6-36340 6 days ago	7-13173 7 days
37407	Paul-Lez author:Paul-Lez	feat(Data/List/Basic): lemma about sums of lists	Co-authored-by: Xavier Genereux --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	4/0	Mathlib/Data/List/Basic.lean	1	1	['github-actions']	nobody	6-31815 6 days ago	6-31078 6 days ago	0-3448 57 minutes
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 blocked-by-other-PR merge-conflict 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	6-30234 6 days ago	25-3402 25 days ago	0-85 1 minute
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 - [ ] depends on: #35909 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	2150/599	Archive/Imo/Imo2010Q5.lean,Archive/Wiedijk100Theorems/BuffonsNeedle.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/HeawoodUnitDistance.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCocone.lean,Mathlib/Algebra/Homology/Refinements.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/HasSpectralSequence.lean,Mathlib/Algebra/Homology/SpectralObject/Page.lean,Mathlib/Algebra/Homology/SpectralObject/SpectralSequence.lean,Mathlib/Algebra/Lie/Derivation/BaseChange.lean,Mathlib/Algebra/Module/TransferInstance.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Range.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/SimplicialComplex/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Convex/SimplicialComplex/AffineIndependentUnion.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Reproducing.lean,Mathlib/Analysis/Normed/Algebra/Basic.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Field/Krasner.lean,Mathlib/Analysis/Normed/Module/Bases.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Digamma.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Localization.lean,Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Lax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Yoneda.lean,Mathlib/CategoryTheory/Comma/Over/OverClass.lean,Mathlib/CategoryTheory/Functor/ReflectsIso/Exact.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/IsTerminal.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/IsPullback/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/CategoryTheory/Monoidal/OfHasFiniteProducts.lean,Mathlib/CategoryTheory/Sites/Point/OfIsCofiltered.lean,Mathlib/CategoryTheory/Topos/Sheaf.lean,Mathlib/CategoryTheory/Triangulated/TStructure/ETrunc.lean,Mathlib/CategoryTheory/Triangulated/TStructure/TruncLEGT.lean,Mathlib/CategoryTheory/Triangulated/TStructure/TruncLTGE.lean,Mathlib/Combinatorics/Graph/Subgraph.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/Indicator.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/Sum/Basic.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/FieldTheory/RatFunc/Luroth.lean,Mathlib/Geometry/Euclidean/Sphere/Basic.lean,Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/NormedSpace.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/VectorBundle/CovariantDerivative/Basic.lean	163	66	['SnirBroshi', 'adomani', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	6-29737 6 days ago	9-26530 9 days ago	0-22145 6 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	136/0	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/RingTheory/MvPowerSeries/Restricted.lean,Mathlib/RingTheory/MvPowerSeries/test.lean	4	43	['WilliamCoram', 'erdOne', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts']	alreadydone assignee:alreadydone	6-27620 6 days ago	6-27602 6 days ago	18-10620 18 days
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	6-27490 6 days 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	6-27224 6 days ago	6-27224 6 days ago	0-6963 1 hour
36072	erdOne author:erdOne	feat(AlgebraicGeometry): essential smallness of affine schemes locally of finite type over a base	Co-authored-by: Joël Riou --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated awaiting-author	151/2	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	6	7	['WilliamCoram', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca']	nobody	6-26167 6 days ago	32-16590 32 days ago	1-79945 1 day
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	6-26143 6 days ago	unknown	0-0 0 seconds
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	195/4	Mathlib.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/Primrec/List.lean,Mathlib/Computability/Primrec/Nat.lean,Mathlib/Data/Nat/Log.lean	5	6	['eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	6-25763 6 days ago	6-24310 6 days ago	47-21333 47 days
37317	vihdzp author:vihdzp	feat: a topology with a basis of clopens is completely regular	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	11/0	Mathlib/Topology/Separation/CompletelyRegular.lean	1	4	['felixpernegger', 'github-actions', 'themathqueen', 'vihdzp']	urkud assignee:urkud	6-24544 6 days ago	9-18006 9 days ago	9-17996 9 days
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	85/0	Mathlib.lean,Mathlib/NumberTheory/Transcendental/AnalyticPart.lean	2	12	['MichaelStollBayreuth', 'SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mkaratarakis']	MichaelStollBayreuth assignee:MichaelStollBayreuth	6-23916 6 days ago	6-23971 6 days ago	10-42418 10 days
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	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	12	['YaelDillies', 'artie2000', 'github-actions', 'mathlib-dependent-issues']	nobody	6-23602 6 days ago	14-8424 14 days ago	0-1478 24 minutes
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	6-21736 6 days ago	50-9225 50 days ago	0-169 2 minutes
36378	EtienneC30 author:EtienneC30	refactor: define the geometric distribution via a sum of Dirac masses	Change the definition of `geometricMeasure p` to be `Measure.sum (fun n ↦ ENNReal.ofReal ((1 - p) ^ n * p)) • (.dirac n))` instead of using `PMF`. This allows to directly use API for measures instead of having to develop an API for `PMF`, which anyway is defined as a sum of Dirac masses. Also add some results about integrals against the geometricMeasure. --- - [x] depends on: #36355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability large-import	138/25	Mathlib/Probability/Distributions/Geometric.lean	1	40	['DavidLedvinka', 'EtienneC30', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'pfaffelh']	RemyDegenne assignee:RemyDegenne	6-20716 6 days ago	6-25758 6 days ago	28-21017 28 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	6-20143 6 days ago	185-79293 185 days ago	0-1020 17 minutes
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	6-20080 6 days ago	10-15221 10 days ago	0-1 1 second
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	253/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/Map.lean,MathlibTest/CategoryTheory/MapSimp.lean,MathlibTest/CategoryTheory/MapSimpCheck.lean	6	5	['adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	adamtopaz assignee:adamtopaz	6-18555 6 days ago	6-18616 6 days ago	11-54357 11 days
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	112/3	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	8	21	['Komyyy', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	6-18459 6 days ago	222-85921 222 days ago	30-62878 30 days
37138	dtumad author:dtumad	feat(Data/FinEnum): instances for standard signed and unsigned integer types	Adds `FinEnum` instances for `UIntN`/`IntN` for various `N`, and for platform sized integers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	45/0	Mathlib/Data/FinEnum.lean	1	8	['dtumad', 'github-actions', 'joneugster', 'linesthatinterlace']	joneugster assignee:joneugster	6-17618 6 days ago	6-17618 6 days ago	10-53841 10 days
30551	smmercuri author:smmercuri	feat: `NumberField.InfinitePlace.sum_inertiaDeg_eq_finrank`	If `L/K` are number fields number fields and `v : InfinitePlace K`, then the sum of inertia degrees of `w : InfinitePlace L` lying over `v` is the degree of `L` over `K`. --- - [x] depends on: #27978 - [x] depends on: #27974 - [x] depends on: #29942 - [x] depends on: #29946 - [x] depends on: #36132 - [x] depends on: #36257 - [x] depends on: #36268 - [x] depends on: #36353 - [x] depends on: #36393 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra label:t-algebra$	196/7	Mathlib.lean,Mathlib/NumberTheory/NumberField/Completion/InfinitePlace.lean,Mathlib/NumberTheory/NumberField/Completion/LiesOverInstances.lean,Mathlib/NumberTheory/NumberField/Completion/Ramification.lean	4	10	['Multramate', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	6-16732 6 days ago	6-16787 6 days ago	16-40796 16 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	10	['Multramate', 'github-actions', 'smmercuri']	mattrobball assignee:mattrobball	6-16706 6 days ago	6-16762 6 days ago	39-6693 39 days
35653	pepamontero author:pepamontero	feat: add ChartedSpace structure on orbit space	Add topological preliminaries for properly discontinuous group actions, and use them to equip the orbit space `orbitRel.Quotient G M` with a `ChartedSpace` structure. In particular: - Show that the quotient map `Quotient.mk _ : M → orbitRel.Quotient G M` is a covering map and hence a local homeomorphism. - Construct chosen local inverses of the quotient map and establish properties over them. - Define a `ChartedSpace` instance on the quotient by composing these local inverses with charts of M. This started as an ItaLean2025 project; here is the [Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/541885-ItaLean-2025/topic/Projects.3A.20Quotient.20Manifolds/with/575121158) dedicated to it. ---	new-contributor t-differential-geometry	186/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/OrbitSpace.lean,Mathlib/Topology/Algebra/OrbitSpace.lean	3	13	['Rida-Hamadani', 'github-actions']	PatrickMassot, grunweg, ocfnash, sgouezel assignee:ocfnash assignee:grunweg assignee:sgouezel assignee:PatrickMassot	6-15831 6 days ago	43-2557 43 days ago	43-3222 43 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']	PatrickMassot assignee:PatrickMassot	6-15822 6 days ago	6-17976 6 days ago	6-71380 6 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	6-15628 6 days ago	6-16639 6 days ago	25-6223 25 days
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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	117/2	Mathlib.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/UFD.lean,Mathlib/RingTheory/Localization/Away/Basic.lean	4	2	['github-actions', 'tb65536']	mattrobball assignee:mattrobball	6-14808 6 days ago	6-14865 6 days ago	21-12724 21 days
37336	mbkybky author:mbkybky	feat(RingTheory/Polynomial): some lemmas about `Ideal.leadingCoeff`	Add some lemmas about [Ideal.leadingCoeff](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Polynomial/Basic.html#Ideal.leadingCoeff). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	54/1	Mathlib/RingTheory/Polynomial/Basic.lean	1	3	['github-actions', 'wwylele']	nobody	6-14797 6 days ago	7-67168 7 days ago	8-18714 8 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	296/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	6-13103 6 days ago	6-13104 6 days ago	0-463 7 minutes
37388	xgenereux author:xgenereux	feat(FunctionField): constant extensions are finite	Let `F` be a function field over `Fq`. If `E` is an algebraic extension of `Fq` which is contained in `F` then it is finite over `Fq`. To implement this, we model the following tower of extensions: ``` E(X) - F / \ \| E[X] Fq(X) / \ / E Fq[X] \ / Fq ``` by assuming algebra hypotheses on the level of `Fq[X]` and `E[X]` and use ``` attribute [local instance] Polynomial.algebra ``` together with the scoped `RatFunc` instances `RatFunc.liftAlgebra` and `RatFunc.isScalarTower_liftAlgebra` to obtain the appropriate algebra instances from `RatFunc Fq/E`. One annoying thing is that using these instances creates a diamond with `RatFunc.instSMulOfFractionRingPolynomial`, I am working on trying to find a fix but don't have anything at the moment. I am open to suggestions! Here are some details on this diamond: Since both `RatFunc E` and `FractionRing E[X]` (which are not defeq) have an `IsFractionRing E[X]` instance we get two maps coming from `RatFunc.liftAlgebra`: 1. (RatFunc.liftAlgebra Fq (FractionRing E[X])) 2. (RatFunc.liftAlgebra Fq (RatFunc E)) Where the first one is transported back to `RatFunc E` via `RatFunc.instSMulOfFractionRingPolynomial`. Analyzing ``` @RatFunc.instSMulOfFractionRingPolynomial _ _ (RatFunc Fq) (RatFunc.liftAlgebra Fq (FractionRing E[X])).toSMul = (RatFunc.liftAlgebra Fq (RatFunc E)).toSMul ``` we see that this boils down to `{ toFractionRing := (IsLocalization.lift ⋯) x } = (IsFractionRing.lift ⋯) x` not being defeq. 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-number-theory	64/0	Mathlib/NumberTheory/FunctionField.lean,docs/references.bib	2	1	['github-actions']	tb65536 assignee:tb65536	6-11311 6 days ago	6-85370 6 days ago	6-85637 6 days
35790	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory/AlgebraicGeometry): Flasque Sheaves have vanishing cohomology	Proves cohomology vanishing for flasque sheaves. The contents of `ZeroOutside.lean` is essentially an ad hoc proof that injective sheaves of abelian groups are flasque. The most principled way of proving this would likely be to formalize all of the following: 1. Extension by zero for sheaves of modules. 2. Injective sheaves of modules on a topological space are flasque. 3. Show that the forgetful functor from sheaves of `constant sheaf ℤ` modules to sheaves of abelian groups is an equivalence of categories. 2 and 3 are likely not that hard (I wouldn't be surprised if 3 was in mathlib in some more general form) but doing 1 correctly I think would be quite tricky. I'm not sure what the usual mathlib protocol is for this kind of thing but I propose that this ad hoc method is left in the file `ZeroOutside.lean` to make it easy to swap out when the necessary general machinery is developed to replace it (I could make the definitions in that file private if that would help guarantee it is not build off of). This is so more results on sheaf cohomology can be developed in the meantime. --- - [ ] 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	601/4	Mathlib.lean,Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.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/Sheaf.lean,Mathlib/Topology/Sheaves/ZeroOutside.lean	10	9	['Brian-Nugent', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smorel394']	dagurtomas assignee:dagurtomas	6-6753 6 days ago	39-69782 39 days ago	0-23 23 seconds
36324	psinary-sketch author:psinary-sketch	feat(NumberTheory/LSeries): Schwarz reflection for completedRiemannZeta₀	--- Three new theorems about `completedRiemannZeta₀`: - `completedRiemannZeta₀_conj`: Schwarz reflection `Λ₀(conj s) = conj(Λ₀(s))` - `completedRiemannZeta₀_im_eq_zero_on_half`: the completed zeta function is real-valued on the critical line - `completedRiemannZeta₀_conj_eq_self_on_half`: equivalent fixed-point formulation The Schwarz reflection follows from the Mellin representation: the kernel is real-valued, so the integral commutes with conjugation via `integral_conj`. The critical-line results compose this with the functional equation. AI disclosure: Lean code developed with Claude (Anthropic) assistance in workflow. Mathematical content and proof strategies are original. All code verified locally with lake env lean before submission.	t-number-theory new-contributor LLM-generated	201/0	Mathlib.lean,Mathlib/NumberTheory/LSeries/SchwarzReflection.lean	2	14	['SnirBroshi', 'github-actions', 'psinary-sketch']	alexjbest assignee:alexjbest	6-4304 6 days ago	6-5307 6 days ago	19-55449 19 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	308/0	Mathlib.lean,Mathlib/Analysis/Calculus/ArcLengthReparametrization.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	4	57	['SnirBroshi', 'github-actions', 'grunweg', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'michael-novak-math']	j-loreaux assignee:j-loreaux	6-2430 6 days ago	13-43558 13 days ago	6-71708 6 days
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	367/6	Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	3	8	['Timeroot', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	5-85221 5 days ago	5-86370 5 days ago	3-3692 3 days
37358	grunweg author:grunweg	chore(Geometry/Manifold): don't expose definitions depending on choice	Some definitions in `Immersion.lean` still depend on choice, but need to be exposed for subsequent instances using their definition. We leave them alone for now. Also make not exposing definition the default in LocalDiffeomorph; two definitions have useful defeq, the others do not. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry tech debt	12/12	Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/Geometry/Manifold/IsManifold/InteriorBoundary.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean	4	1	['github-actions']	nobody	5-83857 5 days ago	5-83799 5 days ago	0-373 6 minutes
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	57/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	25	['MichaelStollBayreuth', 'github-actions', 'loefflerd', 'mkaratarakis']	loefflerd assignee:loefflerd	5-82816 5 days ago	5-82816 5 days ago	26-3985 26 days
36788	hommmmm author:hommmmm	feat(RingTheory): height of span of a prime element is one	## Summary - Add `Ideal.height_span_singleton_eq_one_of_prime`: in a Noetherian integral domain, the ideal generated by a prime element has height one. ## Notes The new theorem follows directly from `height_le_one_of_isPrincipal_of_mem_minimalPrimes` (upper bound) and the fact that `span {p} ≠ ⊥` for `p` prime (lower bound). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	12/1	Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean	1	5	['Multramate', 'github-actions', 'hommmmm']	mattrobball assignee:mattrobball	5-80313 5 days ago	5-81333 5 days ago	19-62158 19 days
36754	mcdoll author:mcdoll	feat(Analysis/Distribution): Sobolev distributions	This is the first part of the definition of the Sobolev space. Here we only define the predicate `MemSobolev`, the subsequent PR will define the space of all Sobolev functions with the correct topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	344/0	Mathlib.lean,Mathlib/Analysis/Distribution/Sobolev.lean	2	9	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mcdoll']	j-loreaux assignee:j-loreaux	5-80127 5 days ago	6-56415 6 days ago	19-46248 19 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 $\mathcal{H}^n(L(A)) = [ L ] \mathcal{L}^n(A)$, or in Lean, `μHE[n] (L '' A) = L.normDet * volume A` - 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. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis large-import	408/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/Analysis/InnerProductSpace/NormDet.lean,docs/references.bib	4	7	['copilot-pull-request-reviewer', 'github-actions', 'wwylele']	ADedecker assignee:ADedecker	5-77866 5 days ago	9-70230 9 days ago	9-70220 9 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	96/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	51	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-77212 5 days ago	5-77213 5 days ago	17-606 17 days
37466	xgenereux author:xgenereux	feat(Torsion/PrimaryComponent): direct sum of primaryComponent on primes is the whole module	Let `M(P)` be the `primaryComponent` for `P : HeightOneSpectrum A`, we have $$M \cong \bigoplus_{P} M(P).$$ This is implemented as `DirectSum.IsInternal`. 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$	68/1	Mathlib/Algebra/Module/Torsion/PrimaryComponent.lean	1	1	['github-actions']	nobody	5-73365 5 days ago	5-73442 5 days ago	5-73432 5 days
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 (This is WIP because it still needs some `erw`, various instances do not seem to match, and the overall structure has to be cleaned-up. - 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$	600/2	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Data/DFinsupp/BigOperators.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/RingQuot.lean	5	9	['AntoineChambert-Loir', 'chrisflav', 'eric-wieser', 'github-actions']	ocfnash assignee:ocfnash	5-69455 5 days ago	7-23459 7 days ago	7-23462 7 days
36781	hommmmm author:hommmmm	feat(RingTheory/UniqueFactorizationDomain): UFD iff height one primes are principal	We prove that a Noetherian integral domain is a UFD if and only if every prime ideal of height one is principal (`UniqueFactorizationMonoid.iff_height_one_prime_principal`). ## New declarations * `UniqueFactorizationMonoid.exists_height_one_le_of_finite_height`: given a prime of finite height ≥ 1, there exists a height one prime contained in it. * `UniqueFactorizationMonoid.ne_bot_of_height_one`: an ideal of height one is nonzero. * `UniqueFactorizationMonoid.height_ge_one_of_prime_ne_bot`: the height of a nonzero prime ideal in a domain is at least one. * `UniqueFactorizationMonoid.height_one_prime_principal`: in a UFD, every height one prime is principal. * `UniqueFactorizationMonoid.of_height_one_prime_principal`: every height one prime being principal implies UFD (Noetherian case). * `UniqueFactorizationMonoid.iff_height_one_prime_principal`: the full iff statement. ## References See https://stacks.math.columbia.edu/tag/0AFT ## AI Disclosure This code is written without AI, then uses Claude Code with cameronfreer's [Lean4-skills](https://github.com/cameronfreer/lean4-skills) (specifically, the `review`, `refactor`, and `golf` workflow) for style changes, refactoring and golfing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor large-import	102/1	Mathlib/RingTheory/UniqueFactorizationDomain/Kaplansky.lean	1	8	['Thmoas-Guan', 'chrisflav', 'github-actions', 'hommmmm', 'tb65536']	mattrobball assignee:mattrobball	5-69454 5 days ago	15-1295 15 days ago	19-36892 19 days
36892	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPowerSeries/NoZeroDivisors): simplify the proof by adding two instances	Add two instances proposed by @eric-wieser : - `WellFoundedLT.wellOrderingRel` : `WellOrderingRel.isWellOrder` satisfies `WellFoundedLT` - `WellFoundedGT.swap` : If a linear order `l` satisfies `WellFoundedLT`, then `l.swap` satisfies `WellFoundedGT`. They clarify the proof of `MvPowerSeries.NoZeroDivisors` that the power series rings over a ring without zero divisors has no zero divisors. Ref. [#mathlib4 > help in RingTheory.MvPowerSeries.NeZeroDivisors](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/help.20in.20RingTheory.2EMvPowerSeries.2ENeZeroDivisors/with/580586392) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	10/3	Mathlib/Order/RelClasses.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/SetTheory/Cardinal/Order.lean	3	3	['JovanGerb', 'github-actions', 'vihdzp']	mariainesdff assignee:mariainesdff	5-69453 5 days ago	17-44129 17 days ago	17-44119 17 days
37349	kim-em author:kim-em	feat(Analysis/Polynomial/MahlerMeasure): Landau's inequality and Mignotte bound	This PR extracts Landau's inequality as a standalone theorem and adds the Mignotte coefficient bound for polynomial factors. Landau's inequality (`mahlerMeasure_le_sqrt_sum_sq_norm_coeff`) states that the Mahler measure of a polynomial is at most `√(∑ ‖coeff i‖²)`. This was previously buried as an intermediate step inside the proof of `mahlerMeasure_le_sqrt_natDegree_add_one_mul_supNorm`, which is now a short corollary. The Mignotte bound (`norm_coeff_le_choose_mul_mahlerMeasure_mul`) says that if `f = g * h` with `M(h) ≥ 1`, then `‖g.coeff n‖ ≤ C(deg g, n) · M(f)`. The hypothesis `M(h) ≥ 1` holds in particular for nonzero integer polynomials (via `one_le_mahlerMeasure`, also added here). This is the classical bound used in Berlekamp–Zassenhaus polynomial factorization. New declarations: - `one_le_mahlerMeasure` - `mahlerMeasure_le_sqrt_sum_sq_norm_coeff` - `le_mahlerMeasure_mul_right` / `le_mahlerMeasure_mul_left` - `norm_coeff_le_choose_mul_mahlerMeasure_mul` The ℓ² norm is stated explicitly as `√(∑ i ∈ p.support, ‖p.coeff i‖ ^ 2)` with a TODO to restate using a dedicated polynomial ℓ² norm once one is defined (cf. the TODO in `Mathlib.Analysis.Polynomial.Norm`). 🤖 Prepared with [Claude Code](https://claude.ai/code)	t-analysis	58/20	Mathlib/Analysis/Polynomial/MahlerMeasure.lean	1	3	['github-actions', 'khwilson', 'mathlib-bors']	j-loreaux assignee:j-loreaux	5-69448 5 days ago	7-68973 7 days ago	7-69267 7 days
37430	RemyDegenne author:RemyDegenne	feat: lemmas about predictablePart	Co-authored-by: Etienne Marion @EtienneC30 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	brownian t-measure-probability	19/0	Mathlib/Probability/Martingale/Centering.lean	1	3	['github-actions', 'kex-y']	kex-y assignee:kex-y	5-69442 5 days ago	6-32749 6 days ago	6-32739 6 days
37454	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/Topology/Category/LightProfinite/Limits.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017310641) by @dagurtomas.	t-topology	7/0	Mathlib/Topology/Category/LightProfinite/Limits.lean	1	1	['github-actions']	PatrickMassot assignee:PatrickMassot	5-69439 5 days ago	6-10311 6 days ago	6-10301 6 days
31176	mcdoll author:mcdoll	feat(Analysis): Taylor's theorem with the integral remainder	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author merge-conflict	169/2	Mathlib.lean,Mathlib/Analysis/Calculus/TaylorIntegral.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,docs/100.yaml,docs/undergrad.yaml	5	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	5-67153 5 days ago	133-41242 133 days ago	7-31176 7 days
36968	NoahW314 author:NoahW314	feat: add missing IndiscreteTopology instances	Add several instances for the IndiscreteTopology. These instances are chosen as they have short proofs and imply many of the more common instances like `NormalSpace` and `LocPathConnectedSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	21/0	Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/Metrizable/Basic.lean	4	3	['felixpernegger', 'github-actions']	PatrickMassot assignee:PatrickMassot	5-61816 5 days ago	5-61870 5 days ago	15-41997 15 days
37222	SnirBroshi author:SnirBroshi	feat(LinearAlgebra/Matrix/ConjTranspose): `conjTranspose` as an `AlgEquiv`	Wrap `Matrix.conjTranspose` as a `StarAlgEquiv` to the opposite ring. Also upgrade the existing `RingEquiv` to a `StarRingEquiv`. --- This relies on `TrivialStar R` (the matrix has entries in `α` which is an `R`-algebra) because an `AlgEquiv` requires `f (r • M) = r • (f M)` but `conjTranspose` gives `(r • M)ᴴ = (star r) • Mᴴ`. Unlike `LinearEquiv` there doesn't seem to be a ["semilinear" variant of it over `starRingEnd`](https://github.com/leanprover-community/mathlib4/blob/3871d9aa5a510dda9dcf837fbb6ba30d6927d504/Mathlib/Algebra/Module/LinearMap/Star.lean#L25). - [x] depends on: #37178 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/27	Mathlib/LinearAlgebra/Matrix/ConjTranspose.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-58916 5 days ago	5-58977 5 days ago	5-59543 5 days
37171	SnirBroshi author:SnirBroshi	chore(Data/Int/Init): generalize `le_induction` from `Prop` to `Sort*` + def lemmas	--- [Zulip 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Add.20note.20to.20help.20search.20similar.20thms/near/535331432) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data large-import	56/48	Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Init.lean,Mathlib/GroupTheory/CoprodI.lean	3	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'plp127']	nobody	5-58660 5 days ago	5-58690 5 days ago	6-66382 6 days
37193	JJYYY-JJY author:JJYYY-JJY	doc(metric): add main results sections for metric spaces	Add Main results sections to metric-space definition modules This PR improves discoverability in the metric-space definition modules by adding curated Main results sections and by fixing a stale internal file reference. Add a Main results section to the pseudo-metric definitions module, highlighting key constructions and foundational lemmas. Add a Main results section to the metric-space definitions module, highlighting core constructions and distance-based characterization lemmas. Update the implementation note to point to the current pseudo-metric definitions path, clarifying where elementary pseudometric facts live. This is a docstring-only change: No declarations, theorem names, imports, instances, or proofs are changed; only module docstrings in the two metric-space definition files are edited. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor	17/3	Mathlib/Topology/MetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	2	6	['copilot-pull-request-reviewer', 'felixpernegger', 'github-actions']	j-loreaux assignee:j-loreaux	5-50753 5 days ago	5-50815 5 days ago	6-51134 6 days
36451	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Matching): `edgeSet` is injective and strictly monotonic on matchings, and more API	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	41/10	Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	2	3	['github-actions', 'mathlib-merge-conflicts']	nobody	5-47539 5 days ago	5-47565 5 days ago	22-43776 22 days
28546	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): basic setup of Zd, full shift, cylinders, pat…	This PR adds a group-generic foundation for symbolic dynamics over an arbitrary group `G`, together with convenient specializations for `ℤ` and `ℤ^d`. Summary of additions: - Full shift and shift action - `abbrev FullShift (A G) := G → A` (inherits product topology from the Π-type). - Right shift `shift g x` with convention `(shift g x) h = x (h * g)`. - Cylinders and topology - `cylinder U x : Set (G → A)` for finite `U : Finset G`. - Cylinders are open under `[DiscreteTopology A]`; with a finite alphabet they are also closed. - Equality with dependent products: `cylinder U x = Set.pi (↑U) (fun i => ({x i} : Set A))`, enabling use of the `Set.pi` API. - Patterns, occurrences, and subshifts - `Pattern A G` with finite `support : Finset G` and `data : support → A`. - `Pattern.occursIn p x g` (occurrence at translate `g`) and the expected shift law. - `forbids F` and `Subshift A G` (closed, shift-invariant subsets). - `FixedSupport A G U` with an equivalence to `(U → A)` to obtain finiteness. - Language on finite shapes and counting - `languageOn X U`, `languageCardOn X U`, and `patternCountOn Y U`. - Entropy along a shape sequence - `limsupAtTop` (as an `sInf` of eventual upper bounds). - `entropyAlong X F hF := limsup (log (patternCountOn X (F n) + 1) / \|F n\|)` for any nonempty finite shapes `F : ℕ → Finset G` (the `+ 1` avoids `log 0`). - Specializations - `IntShapes`: segments `[-n,n]` on `Multiplicative ℤ`, with `entropy_Z`. - `ZdShapes`: boxes `[-n,n]^d` on `ℤ^d` (as functions `Fin d → ℤ`), with `entropy_Zd`. Mathematical remarks: - The API is shape-parametric: entropy is defined along user-provided finite shapes. - On amenable groups, using a Følner sequence yields a canonical value (Ornstein–Weiss). This PR does not assume amenability; the family of shapes is an explicit input. Motivation: Provide a clean, reusable base for symbolic dynamics on groups in mathlib. Future work: - Add a Følner predicate and prove shape-independence / limit existence on amenable groups. - Expand the `ℤ`/`ℤ^d` toolkit (alternative shapes, mixing, factors). - Develop 1D theory and, longer-term, multidimensional SFT results (e.g. along the lines of Hochman–Meyerovitch).	t-dynamics new-contributor awaiting-author	746/0	Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/Tactic/Translate/ToAdditive.lean	3	182	['Sfgangloff', 'botbaki-review', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'sgouezel']	urkud assignee:urkud	5-47008 5 days ago	7-18309 7 days ago	145-11846 145 days
37401	eric-wieser author:eric-wieser	refactor: unify `Algebra.algebraMap` and `algebraMap`	There's no need for the abbrev here, now that field argument explicitness can be overriden we can use it directly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	5/12	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Tactic/Module.lean	3	1	['github-actions']	nobody	5-46192 5 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/)		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	4	['github-actions', 'grunweg', 'j-loreaux']	nobody	5-44228 5 days ago	5-45530 5 days ago	5-51992 5 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/)		6/38	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/NumberTheory/Padics/PadicNorm.lean	4	1	['FernandoChu', 'github-actions']	nobody	5-42553 5 days ago	7-79855 7 days ago	7-79845 7 days
37414	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): predicates for `Monomial`	Introduce `FirstNonzeroIsPos`, `FirstNonzeroIsNeg` and `AllZero` predicates on lists of real numbers. When applied to a list of exponents of a monomial in a well-formed basis, this trichotomy determines its asymptotic behaviour: `FirstNonzeroIsPos` means it tends to infinity, `FirstNonzeroIsNeg` means it tends to zero and `AllZero` means it tends to a constant. --- 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	92/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Monomial/Predicates.lean	3	5	['WilliamCoram', 'github-actions', 'vasnesterov']	JovanGerb assignee:JovanGerb	5-42531 5 days ago	6-41651 6 days ago	6-42326 6 days
33662	Pjotr5 author:Pjotr5	feat(Algebra/Order/BigOperators/Expect): add lemmas and strict variants	### Summary - Combine `le_expect_nonempty_of_subadditive` and `le_expect_of_subadditive` into a single lemma `le_expect_of_subadditive`. The extra assumptions `(hs : s.Nonempty)` and `(h_zero : m 0 = 0)` are unnecessary (since `m 0 = 0` follows from `h_div`). This requires a small downstream update to `Mathlib/Analysis/RCLike/Basic.lean` (`norm_expect_le`). - Add strict-inequality variants: `expect_lt_expect`, `expect_lt`, `lt_expect`. - Add existence lemmas: `exists_le_of_expect_le_expect`, `exists_le_of_le_expect`, `exists_le_of_expect_le`, and `exists_lt_of_expect_lt_expect`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	46/16	Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Analysis/RCLike/Basic.lean	2	7	['Pjotr5', 'b-mehta', 'felixpernegger', 'github-actions']	b-mehta assignee:b-mehta	5-42361 5 days ago	14-84969 14 days ago	90-40099 90 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/)		10/51	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	1	['artie2000', 'github-actions', 'ooovi']	nobody	5-40869 5 days ago	22-17731 22 days ago	22-17721 22 days
35398	vlad902 author:vlad902	feat(SimpleGraph): `bypass` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	17/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	3	['github-actions', 'mkaratarakis']	YaelDillies assignee:YaelDillies	5-40857 5 days ago	5-40857 5 days ago	43-75771 43 days
37382	tb65536 author:tb65536	feat(RingTheory/TensorProduct/Quotient): add flipped version of `tensorQuotientEquiv`	This PR adds the isomorphism `(A ⧸ I) ⊗[R] T ≃ₐ[S] (A ⊗[R] T) ⧸ I.map (algebraMap A (A ⊗[R] T))` which is just the flipped version of the existing isomorphism `A ⊗[R] (T ⧸ I) ≃ₐ[S] (A ⊗[R] T) ⧸ I.map includeRight`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	19/0	Mathlib/RingTheory/TensorProduct/Quotient.lean	1	2	['WenrongZou', 'github-actions']	nobody	5-40713 5 days ago	7-9356 7 days ago	7-9348 7 days
32250	ADedecker author:ADedecker	feat: integration against a locally integrable function as a CLM on test functions	Aka viewing a locally integrable function as a distribution Co-authored-by: @luigi-massacci --- - [x] depends on: #36445 - [x] depends on: #36460 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis large-import awaiting-author	241/0	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean	2	14	['github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	5-40644 5 days ago	13-9058 13 days ago	7-68719 7 days
29550	Raph-DG author:Raph-DG	feat(RingTheory): Order of vanishing in a discrete valuation ring	In this PR we develop some API for working with the order of vanishing in a discrete valuation ring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-ring-theory large-import awaiting-author	554/9	Mathlib.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/GroupWithZero/Action/Basic.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Instances.lean,Mathlib/Algebra/Order/Group/MinMax.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Noetherian.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean	14	90	['Raph-DG', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	erdOne, mariainesdff, riccardobrasca assignee:riccardobrasca assignee:erdOne assignee:mariainesdff	5-39699 5 days ago	7-24472 7 days ago	58-17298 58 days
37482	grunweg author:grunweg	chore: test two consecutive simps in the flexible linter	They are not linted, and should not be --- let's add a test to document this. Found when reviewing #36728. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	easy	9/1	MathlibTest/FlexibleLinter.lean	1	1	['github-actions']	nobody	5-39257 5 days ago	5-39322 5 days ago	5-39312 5 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry awaiting-author	488/0	Mathlib.lean,Mathlib/Geometry/Convex/Cone/Face/Basic.lean,Mathlib/Geometry/Convex/Cone/Face/Lattice.lean	3	167	['YaelDillies', 'eric-wieser', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'ooovi']	nobody	5-38696 5 days ago	5-38696 5 days ago	0-60815 16 hours
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 label:t-algebra$	610/1	Mathlib.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/NonAbelian.lean	3	10	['eric-wieser', 'github-actions', 'kbuzzard', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536', 'xyzw12345']	eric-wieser assignee:eric-wieser	5-36605 5 days ago	48-18510 48 days ago	35-32011 35 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']	nobody	5-31890 5 days ago	11-84821 11 days ago	11-84811 11 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 awaiting-author	13/1	Mathlib/Combinatorics/SimpleGraph/Hasse.lean	1	17	['Rida-Hamadani', 'SnirBroshi', 'ertwro', 'github-actions']	nobody	5-31061 5 days ago	5-38675 5 days ago	8-9738 8 days
37488	sgouezel author:sgouezel	chore: fix instance diamond for order on `Subtype (IsPartition)`	We introduce a type synonym to avoid the diamond. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	23/8	Mathlib/Data/Setoid/Partition.lean	1	1	['github-actions']	nobody	5-30582 5 days ago	5-30650 5 days ago	5-30640 5 days
36863	artie2000 author:artie2000	feat(Algebra/Ring/Subsemiring): subsemiring support	* Add automation for working with support of a subsemiring * Define structure for support of a subsemiring when it's an ideal * Prove sufficient condition for it to be an ideal --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	93/0	Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Support.lean	2	1	['github-actions']	eric-wieser assignee:eric-wieser	5-30412 5 days ago	18-7342 18 days ago	18-7733 18 days
35846	BryceT233 author:BryceT233	feat(RingTheory/MvPowerSeries): add completeness for `MvPowerSeries`	This PR continues the work in #35670 and #35707 by adding typeclass instances for the completeness of `MvPowerSeries` when the index type is finite. --- - [x] depends on: #35789 - [ ] depends on: #35707 - [x] depends on: #35670 - [x] depends on: #35597 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor blocked-by-other-PR large-import	23/0	Mathlib/RingTheory/AdicCompletion/Completeness.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-30283 5 days ago	38-51221 38 days ago	0-104 1 minute
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	5-30102 5 days 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	5-29053 5 days ago	5-38804 5 days ago	12-13181 12 days
35533	mariainesdff author:mariainesdff	feat(RingTheory/DedekindDomain/Ideal/Lemmas): add nontrivial_heightOneSpectrum	Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	12/0	Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean	1	5	['Multramate', 'erdOne', 'github-actions', 'mariainesdff', 'tb65536']	chrisflav assignee:chrisflav	5-28123 5 days ago	33-41118 33 days ago	39-68253 39 days
36886	Deep0Thinking author:Deep0Thinking	feat(Combinatorics/Enumerative/Bonferroni): add Bonferroni inequalities	This PR adds Bonferroni inequalities. Main theorems: - `Finset.indicator_biUnion_le_bonferroniIndicator_of_odd` - `Finset.bonferroniIndicator_le_indicator_biUnion_of_even` - `Finset.card_biUnion_le_bonferroniCard_of_odd` - `Finset.bonferroniCard_le_card_biUnion_of_even` Co-authored-by: Claude (Opus 4.6) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor	334/4	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Bonferroni.lean,Mathlib/Combinatorics/Enumerative/InclusionExclusion.lean	3	4	['AlexeyMilovanov', 'Deep0Thinking', 'github-actions']	nobody	5-26366 5 days ago	17-19014 17 days ago	17-19833 17 days
37492	xgenereux author:xgenereux	feat(Torsion/primaryComponent): restricted surjective map on primaryComponent is surjective	Given a surjective linear map between modules ` φ : M₁ →ₗ[A] M₂`, its restriction to primary components ``` primaryComponent.map P.asIdeal φ : ↥(primaryComponent M₁ P.asIdeal) →ₗ[A] ↥(primaryComponent M₂ P.asIdeal) ``` is also surjective when `P` is a non zero prime ideal in a Dedekind domain `A` and `M₁` and `M₂` are torsion. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #37466 [![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$	123/1	Mathlib/Algebra/Module/Torsion/PrimaryComponent.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-26204 5 days ago	5-26205 5 days ago	0-468 7 minutes
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. - 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$	124/107	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	5-24586 5 days ago	5-81568 5 days ago	0-54358 15 hours
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	143/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-23429 5 days ago	73-80521 73 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	202/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-23282 5 days ago	73-80524 73 days ago	0-235 3 minutes
37431	YaelDillies author:YaelDillies	chore(Algebra/Pointwise): generalise `closure_pow_le`	Thanks to Andrew for spotting this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	11/11	Mathlib/Algebra/Group/Submonoid/Pointwise.lean	1	8	['YaelDillies', 'github-actions', 'grunweg', 'j-loreaux', 'vihdzp']	nobody	5-19374 5 days ago	5-19432 5 days ago	5-75580 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	279/0	Mathlib.lean,Mathlib/Analysis/Distribution/TestFunctionSchwartz.lean	2	3	['aditya-ramabadran', 'github-actions']	ADedecker assignee:ADedecker	5-17821 5 days ago	5-18995 5 days ago	5-59380 5 days
35243	ScottCarnahan author:ScottCarnahan	refactor(Algebra/MonoidAlgebra/PointwiseSMul): switch action from Finsupp to (Add)MonoidAlgebra and multiplicativize	This PR moves the API for convolution action on functions from `Finsupp` to `MonoidAlgebra`, adding a `Semiring` hypothesis. We do this move, because the convolution action of finsupps on formal functions is more naturally expressed as an action by the monoid algebra with its convolutional multiplication. This PR also multiplicativizes, preserving the original material with `to_additive`. --- The large import is on a module that will be deprecated - I had to add the imports to make the deprecated flags work, but ultimately they will be irrelevant. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra awaiting-author label:t-algebra$	109/52	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/PointwiseSMul.lean,Mathlib/Data/Finsupp/PointwiseSMul.lean	3	4	['github-actions', 'mathlib-merge-conflicts', 'ocfnash']	ocfnash assignee:ocfnash	5-17538 5 days ago	5-17538 5 days ago	35-14662 35 days
36919	chrisflav author:chrisflav	feat(Algebra/Category): `P.Under ⊤ R` has finite limits if `P` is stable under finite products and equalizers	From Pi1. --- - [x] depends on: #36918 - [x] depends on: #36909 - [ ] depends on: #37504 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP blocked-by-other-PR	1089/0	Mathlib/Algebra/Category/Ring/Under/Property.lean,Mathlib/CategoryTheory/Limits/Cones.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Connected.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Preserves/Creates/Finite.lean,Mathlib/CategoryTheory/Limits/Preserves/Creates/Opposites.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-16809 5 days ago	16-81190 16 days ago	0-23 23 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	35/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot', 'scholzhannah']	mcdoll assignee:mcdoll	5-16104 5 days ago	13-12903 13 days ago	13-14143 13 days
26304	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): Definition of algebraic cycles	In this PR we define algebraic cycles on a scheme X to be functions from the points of X to the integers with locally finite support. We introduce some API for this including grading by height in the specialization order, and a definition of the pushforward. - [ ] depends on: #26225 - [ ] depends on: #26259 - [ ] depends on: #35807 --- Note there are a couple of things I'm not quite sure about which I've mentioned in the comments, like how I'm not sure how to make the proof of map_locally finite more manageable and so on. Any comment on these (or anything else!) would be greatly appreciated. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	202/0	Mathlib.lean,Mathlib/Topology/LocallyFinsupp/Pushforward.lean	2	24	['Raph-DG', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	joelriou assignee:joelriou	5-14862 5 days ago	5-14544 5 days ago	4-29627 4 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	5-12029 5 days ago	5-12029 5 days ago	0-2151 35 minutes
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	82/216	Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Prod.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/SupClosed.lean	5	4	['github-actions', 'mathlib-merge-conflicts']	nobody	5-11923 5 days ago	unknown	0-0 0 seconds
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: 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`. 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/)	WIP t-ring-theory	105/96	Mathlib/AlgebraicGeometry/EllipticCurve/Reduction.lean,Mathlib/NumberTheory/NumberField/Completion/FinitePlace.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	5-11920 5 days ago	5-19709 5 days ago	0-192 3 minutes
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	5-10265 5 days ago	126-24843 126 days ago	0-63848 17 hours
35017	robo7179 author:robo7179	feat(Combinatorics/SimpleGraph/Acyclic): every nontrivial tree has at least two leaves	Added two theorems to prove that every non trivial tree has atleast two leaves (one in Finite the other in Acyclic). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author merge-conflict	79/10	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,lake-manifest.json,lean-toolchain	4	41	['IvanRenison', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'robo7179']	YaelDillies assignee:YaelDillies	5-10259 5 days ago	20-13469 20 days ago	34-76622 34 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 merge-conflict	14/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean	2	8	['Rida-Hamadani', 'SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vlad902']	YaelDillies assignee:YaelDillies	5-10256 5 days ago	5-10257 5 days ago	34-33918 34 days
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). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic WIP merge-conflict	348/254	Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.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/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/ConvergenceRadius.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Pi.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/LogDeriv.lean,Mathlib/Analysis/Calculus/Monotone.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Complex/MeanValue.lean,Mathlib/Analysis/Complex/Polynomial/GaussLucas.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Measure.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Continuous.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MellinInversion.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/Normed/Module/RCLike/Basic.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Polynomial/CauchyBound.lean,Mathlib/Analysis/Real/Pi/Irrational.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/RootsExtrema.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Fin/Tuple/Sort.lean,Mathlib/Data/Matrix/Diagonal.lean,Mathlib/Data/Real/ConjExponents.lean,Mathlib/Data/Set/Pairwise/Lattice.lean,Mathlib/Data/Set/Prod.lean,Mathlib/FieldTheory/Differential/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/ImageHyperplane.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/Sphere/Ptolemy.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Matrix/Permutation.lean,Mathlib/LinearAlgebra/Matrix/Stochastic.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean	134	11	['Vierkantor', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	5-10247 5 days ago	25-22607 25 days ago	0-111 1 minute
36552	j-loreaux author:j-loreaux	feat: add instances for `IsMulCommutative s.toWeakerSubobject`	--- - [ ] depends on: #36549 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	60/0	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/RingTheory/NonUnitalSubring/Defs.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Defs.lean	9	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-8940 5 days ago	5-8967 5 days ago	5-9262 5 days
36553	j-loreaux author:j-loreaux	feat: add IsMulCommutative instances for directed families of commutative subobjects	--- - [ ] depends on: #36549 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	169/1	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.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/Algebra/Star/Subalgebra.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean	11	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-8904 5 days ago	5-8927 5 days ago	5-9121 5 days
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	5-8766 5 days ago	unknown	0-0 0 seconds
33935	mckoen author:mckoen	feat(CategoryTheory/Monoidal/Arrow): define monoidal structure on arrow category	defines a monoidal category structure on the arrow category of a cartesian closed category. --- - [x] depends on: #33974 - [x] depends on: #34887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory maintainer-merge large-import	635/1	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Arrow.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/HasLimits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean,Mathlib/CategoryTheory/Monoidal/PushoutProduct.lean	6	39	['dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mckoen']	joelriou assignee:joelriou	5-5229 5 days ago	5-5229 5 days ago	26-46192 26 days
34799	vlad902 author:vlad902	feat(SimpleGraph): the cycle graph and complete graph are Hamiltonian	--- - [ ] depends on: #34797 - [ ] depends on: #35255 [![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	5-4530 5 days ago	62-2192 62 days ago	0-144 2 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	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	5-4524 5 days ago	7-33506 7 days ago	0-629 10 minutes
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	146/0	Mathlib/CategoryTheory/Monad/PBW.lean	1	1	['github-actions']	nobody	5-4151 5 days ago	unknown	0-0 0 seconds
37512	xgenereux author:xgenereux	feat(Valuation/IsTrivialOn): transcendental_of_lt_one	For a `K`-algebra `L` and a valuation `v` over `L` which is trivial on `K`, if `y : L` is such that `y ≠ 0` and `v y < 1`, then it is transcendental over `K`. To add this result we need some lemmas from `RatFunc.AsPolynomial` which are not related to `RatFunc` so I have pulled them out of that file. I also didn't want to put this in `Valuation.Basic` so I have made a new file for valuation which are trivial over some base ring. 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	82/25	Mathlib.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/RingTheory/Valuation/IsTrivialOn.lean	3	1	['github-actions']	nobody	5-3140 5 days ago	5-3111 5 days ago	5-3183 5 days
37075	SproutSeeds author:SproutSeeds	feat: extend `@[reassoc]` to `LinearMap`	Closes #34342. This follows the collaborator notes from the issue thread by keeping the `LinearMap` `@[reassoc]` extension out of `CategoryTheory` and by splitting the relevant universes instead of forcing the codomain universes to coincide. Summary: - add `Mathlib.Tactic.LinearMapReassoc` - extend the existing `@[reassoc]` machinery to generate `_assoc` lemmas for equalities of linear maps - fold the coverage into `MathlibTest/CategoryTheory/Reassoc.lean` Verification: - `COPYFILE_DISABLE=1 ~/.elan/bin/lake build Mathlib.Tactic.LinearMapReassoc MathlibTest.CategoryTheory.Reassoc` - `COPYFILE_DISABLE=1 ~/.elan/bin/lake build Mathlib.Tactic`	t-meta new-contributor awaiting-author LLM-generated	112/6	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearMapReassoc.lean,Mathlib/Tactic/LinearMapReassocTensorProduct.lean,MathlibTest/CategoryTheory/Reassoc.lean	6	10	['JovanGerb', 'SproutSeeds', 'github-actions', 'themathqueen']	nobody	5-296 5 days ago	10-63990 10 days ago	2-74348 2 days
37198	mckoen author:mckoen	feat(AlgebraicTopology/SimplicialSet/Subcomplex): isomorphisms of pushout-products	Defines various isomorphisms of pushout-products. Defines an isomorphism in the arrow category of `SSet` between the canonical inclusion `(S.unionProd T).toSSet ⟶ X ⊗ Y` and the pushout-product `S.ι □ T.ι`. - [x] depends on: #37182 - [ ] depends on: #33935 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebraic-topology blocked-by-other-PR t-category-theory WIP	914/1	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/CategoryTheory/Monoidal/Arrow.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Limits/HasLimits.lean,Mathlib/CategoryTheory/Monoidal/Limits/Shapes/Pullback.lean	7	1	['mathlib-dependent-issues']	nobody	4-86068 4 days ago	11-53545 11 days ago	0-47 47 seconds
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 `Continous.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	57/33	Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,MathlibTest/fun_prop_dev.lean	5	6	['gasparattila', 'github-actions', 'grunweg', 'lecopivo', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	4-84849 4 days ago	9-81983 9 days ago	41-79534 41 days
30077	agjftucker author:agjftucker	feat(Analysis/Calculus/ImplicitFunction): define implicitFunctionOfBivariate	Two specializations of the implicit function theorem, one applying to an uncurried bivariate function and one applying to a curried bivariate function. --- - [ ] depends on: #26985 This PR is a synthesis of material from others which failed to make progress. But there seems always to have been a different reason for it, so I'm afraid I keep trying where maybe I shouldn't. #26985 reviewed by j-loreaux and later on by winstonyin. #16743 and #26300 reviewed by sgouezel. [Zulip chat](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Inverse.20function.20theorem.20and.20ContinuousLinearEquiv/with/567586606) with Yury Kudryashov. There are certain changes agreed upon in those PRs, e.g. to existing names, that are doubtless good but that I have excised from this PR to avoid distraction. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	187/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Calculus/ImplicitFunction/Bivariate.lean,Mathlib/Analysis/Calculus/ImplicitFunction/ProdDomain.lean	4	12	['agjftucker', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	4-84714 4 days ago	5-11271 5 days ago	50-75599 50 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 blocked-by-other-PR large-import	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	6	['FernandoChu', 'github-actions', 'mathlib-dependent-issues', 'vihdzp']	nobody	4-84456 4 days ago	6-16404 6 days ago	0-116 1 minute
37513	chrisflav author:chrisflav	feat(AlgebraicGeometry): geometrically connected schemes	--- - [ ] depends on: #37515 - [ ] depends on: #37514 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebraic-geometry blocked-by-other-PR	214/22	Mathlib/AlgebraicGeometry/Geometrically/Connected.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	7	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-83239 4 days ago	5-2484 5 days ago	0-2 2 seconds
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	2	['github-actions', 'vihdzp']	nobody	4-81359 4 days ago	4-85050 4 days ago	4-85040 4 days
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	81/1	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean	2	1	['github-actions']	nobody	4-80568 4 days ago	4-80643 4 days ago	4-80633 4 days
37443	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walks/Operations): permutations of support	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	4-79648 4 days ago	4-79673 4 days ago	6-3155 6 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/)		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	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-79647 4 days ago	4-79670 4 days ago	9-52998 9 days
37406	vihdzp author:vihdzp	feat(SetTheory/Cardinal): `IsStrongPrelimit` predicate	We introduce a predicate for cardinals `c` such that `x < c` implies `x < 2 ^ c`. This is to `IsStrongLimit` as `IsSuccPrelimit` is to `IsSuccLimit`. We then make use of it in a few places where we were writing down `∀ x < c, x < 2 ^ c` explicitly. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	56/25	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/Regular.lean	4	1	['github-actions']	nobody	4-79583 4 days ago	4-79639 4 days ago	6-46161 6 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	4-77278 4 days ago	16-73543 16 days ago	33-16907 33 days
37356	BryceT233 author:BryceT233	feat(RingTheory): uniqueness of the lift of a simple root and the adic completeness of artinian local ring	This PR adds the following three lemmas: * `Polynomial.exists_mul_sq_add_linear_part_eq_eval_add`: this is an alternative version of `Polynomial.eval_add_of_sq_eq_zero` and is used in the lemma `IsLocalRing.eq_of_eval_eq_zero_of_not_isUnit_sub`. * An instance that an artinian local ring is adic complete with respect to its maximal ideal. * `IsLocalRing.eq_of_eval_eq_zero_of_not_isUnit_sub`: this is [stacks [06RR]](https://stacks.math.columbia.edu/tag/06RR) which shows the uniqueness of the lift of a simple root given by the henselian property. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	40/4	Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/Henselian.lean	3	4	['BryceT233', 'artie2000', 'github-actions']	nobody	4-76129 4 days ago	7-61044 7 days ago	7-61277 7 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	129/227	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	60	8	['DavidLedvinka', 'JovanGerb', 'github-actions', 'j-loreaux', 'lecopivo', 'mathlib-merge-conflicts']	nobody	4-74116 4 days ago	unknown	0-0 0 seconds
36871	psinary-sketch author:psinary-sketch	feat(Analysis/Analytic): nonvanishing in punctured neighborhood from derivative	Add AnalyticAt.eventually_ne_nhdsWithin_of_deriv_ne_zero: if f is analytic at x and f'(x) ≠ 0, then f(w) ≠ f(x) in a punctured neighborhood of x. No hypothesis on f(x) needed — stronger than the version in #36778. Placed in Order.lean per review feedback from @wwylele. Split from #36778 (2 of 3). AI disclosure: Lean code developed with Claude (Anthropic) assistance in workflow. Mathematical content and proof strategies are original. All code verified locally with lake env lean before submission.	t-analysis new-contributor LLM-generated awaiting-author	13/1	Mathlib/Analysis/Analytic/Order.lean	1	6	['github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'psinary-sketch']	j-loreaux assignee:j-loreaux	4-74038 4 days ago	5-81900 5 days ago	11-26437 11 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	17/76	Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Sets/VietorisTopology.lean	2	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	mcdoll assignee:mcdoll	4-69883 4 days ago	5-23423 5 days ago	5-23550 5 days
34275	gasparattila author:gasparattila	feat(Topology/Sets): topological properties of `(Nonempty)Compacts.map`	--- - [x] depends on: #34268 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	80/1	Mathlib/Topology/Sets/VietorisTopology.lean	1	10	['gasparattila', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'scholzhannah']	j-loreaux assignee:j-loreaux	4-69882 4 days ago	5-23426 5 days ago	5-25515 5 days
34276	gasparattila author:gasparattila	feat(Topology/Sets): discreteness of `(Nonempty)Compacts`	--- - [x] depends on: #34268 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	20/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	j-loreaux assignee:j-loreaux	4-69881 4 days ago	5-23428 5 days ago	5-25270 5 days
36155	grunweg author:grunweg	feat: custom elaborators for TangentSpace and tangentMap(Within)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta	58/28	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	7	4	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'ocfnash']	PatrickMassot assignee:PatrickMassot	4-69876 4 days ago	30-27524 30 days ago	31-37276 31 days
36224	gasparattila author:gasparattila	feat(Analysis/Normed/Affine): (pseudo)metric on `V →ᴬ[𝕜] Q`	--- - [x] depends on: #36083 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	33/32	Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Group/AddTorsor.lean	2	2	['github-actions', 'mathlib-dependent-issues']	sgouezel assignee:sgouezel	4-69874 4 days ago	5-27236 5 days ago	5-54836 5 days
36328	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve): improve API for maps and base changes	Dot notation for concrete Weierstrass curves (`Affine`/`Jacobian`/`Projective`) does not quite work on `W : WeierstrassCurve F` even though they're all abbreviations of `WeierstrassCurve`, which is annoying for functions that return `WeierstrassCurve`s (currently just `map`, `baseChange`, and `variableChange`). For instance, for an `A : Affine F`, the expression `A.baseChange K` is a `WeierstrassCurve K` rather than an `Affine K`, so `(A.baseChange K).polynomial` will not work since `polynomial` is a function of `Affine K` rather than `WeierstrassCurve K`; instead we have to do `(A.baseChange K).toAffine.polynomial`, which is wordy. This PR introduces abbreviations `Affine/Jacobian/Projective.map/baseChange` to get around this, and introduces scoped notations `W/K`, where the slashes are given by `\textf`. The notation `W⟮K⟯` for `(W.baseChange K)Point` seems to be useless so far and can now be replaced by `(W/K).Point`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	284/288	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.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/AlgebraicGeometry/EllipticCurve/Reduction.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Weierstrass.lean	13	1	['github-actions']	joelriou assignee:joelriou	4-69873 4 days ago	29-82402 29 days ago	29-83024 29 days
36917	iarnoldy author:iarnoldy	feat(LinearAlgebra/CliffordAlgebra): bivector Lie subalgebra	Define the submodule of grade-n elements (n-vectors) in a Clifford algebra and show that bivectors (n = 2) form a `LieSubalgebra` under the commutator bracket. This gives the standard construction of so(Q) from Cl(Q). Main definitions: * `CliffordAlgebra.nvector` — grade-n submodule, spanned by n-fold products of ι * `CliffordAlgebra.bivector` — nvector 2 Q, the bivector submodule * `CliffordAlgebra.bivectorLieSubalgebra` — LieSubalgebra of bivectors Main results: * `CliffordAlgebra.lie_ι_mul_ι` — explicit commutator formula for bivector generators * `CliffordAlgebra.lie_mem_bivector` — bracket closure of the bivector submodule * `CliffordAlgebra.bivector_le_evenOdd_zero` — bivectors lie in the even part The `LieModule` instance for `CliffordAlgebra Q` acting on itself is provided explicitly (`instLieModuleSelf`) because automatic synthesis exceeds the default heartbeat limit. AI disclosure: This code was generated with AI assistance (Claude, Anthropic). The submitter directed the construction and QA but is not a Lean programmer. The mathematical content is classical (Doran & Lasenby, Ch. 3). Extra review scrutiny is welcomed. Co-authored-by: Claude --- Open design questions for reviewers: 1. Naming: Is `nvector` the right name? Eric Wieser suggested generalizing to n-vectors. Alternatives: `ιProd`, `grade`, or following the `exteriorPower` pattern via `equivExterior` pullback. 2. Scalar contamination: The spanning set `{ι m₁ * ι m₂}` includes `ι m * ι m = Q(m)` (scalars). Eric suggested pulling back `exteriorPower` through `equivExterior` for pure grades (requires `Invertible (2 : R)`). Happy to rework if that's preferred. 3. instLieModuleSelf: Should this be an upstream issue rather than a local workaround? @ocfnash 4. ι_mul_ι_comm': This may duplicate existing API (`ι_mul_ι_comm b a` plus `polar_comm`). Happy to inline if reviewers prefer. Discussed on Zulip: https://leanprover.zulipchat.com (Is there code for X? thread)	new-contributor t-algebra LLM-generated label:t-algebra$	338/0	Mathlib.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Bivector.lean	2	2	['github-actions']	eric-wieser assignee:eric-wieser	4-69867 4 days ago	16-76235 16 days ago	16-77450 16 days
37371	kebekus author:kebekus	feat: formulate identity principle for meromorphic functions on topologically perfect subsets	Add a simple, but useful, reformulation of the identity principle for meromorphic functions on topologically perfect subsets. To facilitate application, establish (closures of) open subsets in perfect topological spaces are preperfect sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	43/0	Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Meromorphic/IsolatedZeros.lean,Mathlib/Topology/Perfect.lean	3	1	['github-actions']	j-loreaux assignee:j-loreaux	4-69864 4 days ago	7-20828 7 days ago	7-20818 7 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} (N : Submodule R₁ M₁) (B : M₁ →ₛₗ[I₁] M₂ →ₛₗ[I₂] M) : 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$	17/17	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	4	['eric-wieser', 'github-actions', 'martinwintermath', 'vihdzp']	ocfnash assignee:ocfnash	4-69862 4 days ago	5-29862 5 days ago	6-82191 6 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	265/5	Mathlib/Analysis/Complex/CanonicalDecomposition.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	1	['github-actions']	sgouezel assignee:sgouezel	4-69858 4 days ago	5-39872 5 days ago	5-39862 5 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	107/46	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean	2	1	['github-actions']	sgouezel assignee:sgouezel	4-69857 4 days ago	5-40923 5 days ago	5-40913 5 days
37499	gasparattila author:gasparattila	feat(Topology/Sets): local compactness of `(Nonempty)Compacts`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	46/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	1	['github-actions']	j-loreaux assignee:j-loreaux	4-69857 4 days ago	5-22571 5 days ago	5-22561 5 days
34820	staroperator author:staroperator	feat(Order/Ideal): more results on order ideals	Some iffs, closure of finite supremum, and that every proper ideal is contained in a maximal ideal. --- - [x] depends on: #37467 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order large-import awaiting-author	79/5	Mathlib/Order/Ideal.lean	1	16	['Komyyy', 'bryangingechen', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'staroperator']	Komyyy assignee:Komyyy	4-63875 4 days ago	4-63884 4 days ago	55-73508 55 days
37527	bryanboehnke author:bryanboehnke	feat(LocalRing/Etale): Finite étale extensions of local rings are monogenic	Formalization of Lemma 3.2 from https://arxiv.org/abs/2503.07846: Given a finite extension of local rings R -> S, if the extension is étale, then there exists β ∈ S such that R[β] = S. Furthermore, if f(z) ∈ R[z] is the minimal polynomial of β, then f′(β) is a unit in S. This file also includes some relevant intermediate results used in the formalization of the proof of Lemma 3.1 from the same paper. Co-authored-by: George Peykanu Co-authored-by: Bianca Viray Co-authored-by: Grant Yang --- - [ ] depends on: #36421 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor large-import blocked-by-other-PR	209/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/RingTheory/IsAdjoinRoot.lean,Mathlib/RingTheory/LocalRing/Etale.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	4-62601 4 days ago	4-62602 4 days ago	0-2114 35 minutes
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	145/12	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	2	76	['IvanRenison', 'NickAdfor', 'Rida-Hamadani', 'SnirBroshi', 'YaelDillies', 'github-actions', 'kmill', 'mitchell-horner', 'vihdzp', 'vlad902']	YaelDillies assignee:YaelDillies	4-52995 4 days ago	13-42200 13 days ago	52-34592 52 days
36582	kim-em author:kim-em	feat: run inferInstanceAs% normalization when deriving	This PR intercepts `def ... deriving ...` and `deriving instance ... for ...` commands that use the delta deriving handler, and runs the `normalizeInstance` machinery from `inferInstanceAs%` on the synthesized instances. This fixes carrier type leakage at `reducibleAndInstances` transparency for all delta-derived instances across Mathlib. The implementation copies `mkInst` and `processDefDeriving` from `Lean.Elab.Deriving.Basic` (Lean 4.29.0-rc6) and adds the normalization step. This is intentionally a temporary copy: once we settle on the right behavior, it will be upstreamed into Lean 4. - [ ] depends on: #35950 🤖 Prepared with Claude Code	large-import LLM-generated	353/3	Mathlib/Init.lean,Mathlib/Tactic/DerivingInferInstanceAs.lean,Mathlib/Tactic/InferInstanceAsPercent.lean,MathlibTest/DerivingInferInstanceAs.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-51316 4 days ago	24-58422 24 days ago	0-218 3 minutes
36423	kim-em author:kim-em	perf: decompress already-cached files concurrently with downloads	This PR builds on https://github.com/leanprover-community/mathlib4/pull/32987 (pipeline downloads and decompression) and https://github.com/leanprover-community/mathlib4/pull/36367 (fix: decompress already downloaded files). Previously, already-cached `.ltar` files were only decompressed after all downloads completed, in the final `unpackCache` sweep. This PR starts decompressing them concurrently with downloads by spawning `leantar` as a background task before the download phase begins. The two decompression paths operate on disjoint file sets (pre-cached vs newly downloaded), so there is no conflict. In the common case where a user has most files cached but a few hundred to download, this overlaps several seconds of decompression with network I/O. 🤖 Prepared with Claude Code	LLM-generated CI t-meta	73/26	Cache/IO.lean,Cache/Requests.lean	2	4	['github-actions', 'joneugster', 'kim-em']	joneugster assignee:joneugster	4-50363 4 days ago	4-50687 4 days ago	24-2396 24 days
34969	kim-em author:kim-em	feat(RingTheory/HopfAlgebra): prove antipode is antihomomorphism	This PR proves that the antipode of a Hopf algebra is an antihomomorphism: `antipode (a * b) = antipode b * antipode a`. The proof uses the convolution algebra structure on `(A ⊗ A) →ₗ[R] A` and shows that `S ∘ μ` and `μ ∘ (S ⊗ S) ∘ comm` are both convolution inverses of `μ`, hence they must be equal by uniqueness of inverses. This resolves a TODO listed in the file header. 🤖 Prepared with Claude Code	t-ring-theory LLM-generated delegated ready-to-merge	85/3	Mathlib/RingTheory/HopfAlgebra/Basic.lean	1	18	['YaelDillies', 'github-actions', 'kim-em', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	4-49670 4 days ago	14-46231 14 days ago	42-13893 42 days
34138	pfaffelh author:pfaffelh	feat(MeasureTheory): Introduce `MassFunction α` giving rise to a `Measure α ⊤`	Define `MassFunction α := α → ℝ≥0∞` Define `toMeasure (w : MassFunction α) : @Measure α ⊤` as a sum of diracs Show properties of the resulting objects This PR intends to start a more userfriendly interaction with probability mass functions (`PMF`). There are two main differences between `MassFunction` and `PMF`: * `PMF` hast the additional property `HasSum 1`, making the resulting measure a probability measure. (For `MassFunction`, I intend to use the typeclass `IsProbabilityMeasure`in a later PR instead.) * The `toMeasure` function of `MassFunction` directly 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 WIP awaiting-author	252/1	Mathlib.lean,Mathlib/Algebra/Group/Indicator.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/MeasureTheory/Measure/MassFunction.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	6	19	['DavidLedvinka', 'github-actions', 'metakunt', 'ocfnash', 'pfaffelh']	ocfnash assignee:ocfnash	4-45937 4 days ago	5-20298 5 days ago	71-63732 71 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']	nobody	4-44318 4 days ago	4-83005 4 days ago	4-82995 4 days
36439	xgenereux author:xgenereux	feat(Algebra/Adjoin): CoeT instances for Algebra.adjoin on singletons	Is it 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$	9/3	Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/RingTheory/Adjoin/Polynomial/Basic.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	4-42989 4 days ago	9-82070 9 days ago	27-23163 27 days
37130	tb65536 author:tb65536	wip: ramification	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-number-theory	846/0	Mathlib/NumberTheory/RamificationInertia/Basic copy.lean	1	2	['github-actions']	nobody	4-42987 4 days ago	12-75770 12 days ago	0-14 14 seconds
34854	GrigorenkoPV author:GrigorenkoPV	chore(Combinatorics/Enumerative/Catalan): split into `Basic` & `Tree`	--- Split off from #34853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	227/194	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Enumerative/Catalan/Basic.lean,Mathlib/Combinatorics/Enumerative/Catalan/Tree.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	6	5	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	4-42236 4 days ago	20-16627 20 days ago	40-6516 40 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	84/84	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean	4	20	['MJ141592', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	4-41058 4 days ago	4-41094 4 days ago	4-69605 4 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	2	['YaelDillies', 'github-actions', 'ooovi', 'vihdzp']	nobody	4-40993 4 days ago	6-40612 6 days ago	6-40739 6 days
37515	chrisflav author:chrisflav	feat(Topology): a coinducing map with connected fibers induces a homeomorphism on connected components	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	53/0	Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	3	11	['chrisflav', 'github-actions', 'grunweg', 'scholzhannah']	j-loreaux assignee:j-loreaux	4-40643 4 days ago	4-40805 4 days ago	5-1249 5 days
37514	chrisflav author:chrisflav	chore(Topology/Connected): generalize `preimage_connectedComponent_connected` to closed connected sets	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	33/24	Mathlib/Topology/Connected/Clopen.lean	1	3	['github-actions', 'scholzhannah']	j-loreaux assignee:j-loreaux	4-40554 4 days ago	4-40599 4 days ago	4-86259 4 days
37532	justus-springer author:justus-springer	feat(Algebra/Category/ModuleCat/Sheaf): `isQuasicoherent` and `isFinitePresentation` are closed under isomorphisms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	38/2	Mathlib/Algebra/Category/ModuleCat/Sheaf/Generators.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean	2	1	['github-actions']	nobody	4-38780 4 days ago	4-38856 4 days ago	4-38846 4 days
37503	Vierkantor author:Vierkantor	chore(*): remove comments mentioning obsolete note `[nolint_ge]`	In Lean 3 times we used to have a `ge_or_gt` linter which complained if theorem statements contained `≥` or `>`, and it would be silenced with a reference to the library note `[nolint_ge]`. But the linter and its note never got ported, so the references are irrelevant and we should drop them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter tech debt	1/6	Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Cauchy.lean	5	4	['Vierkantor', 'github-actions', 'grunweg']	nobody	4-37538 4 days ago	5-18450 5 days ago	5-18440 5 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	18/0	Mathlib/Data/Set/Card.lean	1	1	['github-actions']	nobody	4-36654 4 days ago	4-36724 4 days ago	4-36714 4 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/)		7/33	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Data/Int/Interval.lean,Mathlib/GroupTheory/Perm/Support.lean	4	3	['artie2000', 'github-actions', 'mathlib-merge-conflicts']	nobody	4-29193 4 days ago	4-29217 4 days ago	20-1026 20 days
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 - [ ] depends on: #37537 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-differential-geometry blocked-by-other-PR	5115/32	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/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/SmoothSection.lean,Mathlib/Geometry/Manifold/VectorBundle/Tensoriality.lean,Mathlib/Geometry/Manifold/VectorBundle/Unused.lean	27	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	4-28330 4 days ago	34-37314 34 days ago	0-7 7 seconds
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	4-25215 4 days ago	4-25286 4 days ago	4-25276 4 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` * `PointedCone.hull_le_span` as a short form of `Submodule.span_le_restrictScalars R≥0 R s` * `PointedCone.neg_ofSubmodule` proving `-(ofSubmodule S) = S` In preparation for #36605. Co-authored by: Artie Khovanov --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry	28/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	10	['artie2000', 'github-actions', 'martinwintermath', 'ooovi']	nobody	4-24788 4 days ago	4-24826 4 days ago	4-63303 4 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 label:t-algebra$	84/16	Mathlib/Geometry/Convex/Cone/Dual.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/PerfectPairing/Basic.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	4	4	['github-actions', 'martinwintermath', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	4-24621 4 days ago	7-17121 7 days ago	13-75766 13 days
37484	martinwintermath author:martinwintermath	feat(RingTheory/Finiteness): Improve `fg_induction`	- rename `fg_induction` to `fg_induction'` - include the FG-hypothesis into motive for `fg_induction'`. This is necessary, since it might be that `P (M₁ ⊔ M₂)` is only provable from `P M₁`and `P M₂` if we can use that `M₁` and `M₂` are FG. Also, `M₁.FG` and `M₂.FG` are not provable from `(M₁ ⊔ M₂).FG` in general. - add new `fg_induction` variant that adds one 1-dimensional submodule at a time. - give expressive names to the induction start and induction step hypotheses. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	46/34	Mathlib/RingTheory/Bezout.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/Flat/EquationalCriterion.lean	4	2	['github-actions', 'vihdzp']	nobody	4-24571 4 days ago	5-33896 5 days ago	5-33886 5 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. --- - [ ] 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	161/0	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Corecursion.lean	1	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-23534 4 days ago	4-26196 4 days ago	4-26518 4 days
35233	kim-em author:kim-em	chore: lake shake --add-public --keep-implied --keep-prefix --fix	This PR runs `lake shake --add-public --keep-implied --keep-prefix --fix` again after https://github.com/leanprover-community/mathlib4/pull/34511, picking up the remaining 28 files that now have suggestions. 🤖 Prepared with Claude Code	large-import awaiting-author LLM-generated merge-conflict	13/12	Mathlib/Algebra/Category/ModuleCat/Sheaf/Quasicoherent.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Data/Nat/Init.lean,Mathlib/LinearAlgebra/Matrix/Kronecker.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Map.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linter/FindDeprecations.lean,Mathlib/Tactic/Nontriviality/Core.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Tauto.lean	16	17	['TwoFX', 'Vierkantor', 'adomani', 'bryangingechen', 'github-actions', 'joneugster', 'kim-em', 'mathlib-merge-conflicts', 'mathlib-splicebot']	nobody	4-23186 4 days ago	33-31530 33 days ago	11-82916 11 days
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	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	8	['SnirBroshi', 'felixpernegger', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	4-23081 4 days ago	4-35469 4 days ago	0-66443 18 hours
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	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	82	['JovanGerb', 'PatrickMassot', 'Vierkantor', 'github-actions', 'hrmacbeth', 'kim-em', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	4-22988 4 days ago	4-23035 4 days ago	80-61756 80 days
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	216/6	Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Pairwise/Basic.lean,Mathlib/Probability/Distributions/Binomial.lean,Mathlib/Probability/Distributions/SetBernoulli.lean	4	1	['github-actions']	nobody	4-18676 4 days ago	unknown	0-0 0 seconds
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	456/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-16274 4 days ago	unknown	0-0 0 seconds
36689	martinwintermath author:martinwintermath	feat(Algebra/Module/Submodule): Symmetric submodules are modular elements in the lattice of submodules over a semiring	Add lemmas that state that symmetric submodules over a semiring are right/left-modular elements in the not-necessarily-modular lattice of submodules.. There are two new lemmas. Let `s`, `t` and `p` are submodules, the last one is symmetric: * `sup_inf_assoc_of_le_of_neg_mem_iff`: if `s ≤ p` then `s ⊔ (t ⊓ p) = (s ⊔ t) ⊓ p` (i.e., `p` is right-modular) * `inf_sup_assoc_of_le_of_neg_mem_iff`: if `p ≤ s` then `s ⊓ (t ⊔ p) = (s ⊓ t) ⊔ p` (i.e., `p` is left-modular) I am not aware of an implementation of right/left-modular elements, so I stated the lemmas without using the language of modular lattices. I also add specialized versions for cones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	53/8	Mathlib/Geometry/Convex/Cone/Pointed.lean,Mathlib/LinearAlgebra/Span/Basic.lean	2	7	['github-actions', 'martinwintermath', 'ocfnash']	ocfnash assignee:ocfnash	4-14212 4 days ago	4-14212 4 days ago	16-78408 16 days
30900	vihdzp author:vihdzp	feat: run-length encoding	--- - [x] depends on: #30898 Moved from #17105. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	168/0	Mathlib.lean,Mathlib/Data/List/RunLength.lean,Mathlib/Data/List/SplitBy.lean	3	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'plp127']	pechersky assignee:pechersky	4-14181 4 days ago	4-14238 4 days ago	46-43892 46 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 awaiting-author label:t-algebra$	164/4	Mathlib.lean,Mathlib/NumberTheory/RamificationInertia/Valuation.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Valuation/Discrete/RankOne.lean,Mathlib/RingTheory/Valuation/Extension.lean	5	8	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smmercuri']	dagurtomas assignee:dagurtomas	4-14018 4 days ago	4-14018 4 days ago	18-2234 18 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	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-dependent-issues']	nobody	4-13124 4 days ago	4-13125 4 days ago	0-1300 21 minutes
36867	ADedecker author:ADedecker	feat: line derivative of distributions	--- - [ ] depends on: #36866 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	68/2	Mathlib/Analysis/Distribution/Distribution.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	4-12722 4 days ago	5-40586 5 days ago	5-42259 5 days
36723	oliver-butterley author:oliver-butterley	fix(`ClearExcept`): modify so that each `isAuxDecl` is retained	This PR updates the defintion of `ClearExcept` to skip any `isAuxDecl` and adds a test to confirm this behaviour. The intent is that clear * - only clears user-visible local declarations; hidden auxiliary declarations should be handled by more specific mechanisms when needed. Motivation When writing a recursive proof in tactic mode, Lean places the recursive hypothesis in the local context as an auxiliary declaration (`LocalDecl.isAuxDecl`). This declaration is: - Completely invisible in the Infoview (even with all display options enabled) - Required for the recursive call to elaborate Previously the `clear * -` tactic (`Mathlib.Tactic.ClearExcept`) iterates over all declarations in the local context and clears everything not in the explicit keep set or a type-class instance. As such it silently clears the recursive hypothesis. While the hypothesis can technically be added to the keep set by name, it is not shown in the Infoview, making it easy to overlook. In simple examples this is never an issue, the inconvenience was found when working with software verification where the context gets huge and needs clearing for performance and where the recursive goals are closed by automation and so it is easy to overlook the need to explicitly add the name of the theorem to the exclude list. Zulip discussion: ([#general > ClearExcept clears even if isAuxDecl, is this intended?](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/ClearExcept.20clears.20even.20if.20isAuxDecl.2C.20is.20this.20intended.3F/with/578745941)). --- - [ ] depends on: #36961 (refactor proof which uses clear*- to clear auxDecl created by wlog) - [ ] depends on: #36966 (warning that clearExcept does nothing in this use) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	22/8	Mathlib/Data/Vector/Basic.lean,Mathlib/Tactic/ClearExcept.lean,MathlibTest/ClearExcept.lean	3	9	['adam84-hub', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'oliver-butterley']	nobody	4-9708 4 days ago	6-19800 6 days ago	6-19790 6 days
36704	adam84-hub author:adam84-hub	chore(Function): add surjective_iff	Adds an explicit discoverable definitional lemma for `Function.Surjective`. - addresses #31745 - scope is intentionally tiny: one theorem in `Mathlib/Logic/Function/Defs.lean` AI was used for drafting; I reviewed the final code and understand it well enough to vouch for it.	t-logic new-contributor awaiting-author	4/0	Mathlib/Logic/Function/Defs.lean	1	11	['SnirBroshi', 'adam84-hub', 'github-actions', 'plp127', 'vihdzp']	nobody	4-8595 4 days ago	21-64692 21 days ago	0-2124 35 minutes
36189	tb65536 author:tb65536	feat(NumberTheory/ArithmeticFunction/LFunction): construction of L-functions	--- - [x] depends on: #35709 - [x] depends on: #35710 - [x] depends on: #36176 - [x] depends on: #36192 - [x] depends on: #36190 - [x] depends on: #36200 - [x] depends on: #36433 - [ ] depends on: #36642 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra blocked-by-other-PR label:t-algebra$	326/2	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/LFunction.lean,Mathlib/NumberTheory/ArithmeticFunction/LFunction.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean	4	6	['Multramate', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	nobody	4-6650 4 days ago	32-30899 32 days ago	0-1 1 second
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 - [ ] 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	172/0	Mathlib/Data/Sigma/Order.lean,Mathlib/Order/OmegaCompletePartialOrder.lean	2	28	['Vierkantor', 'YellPika', 'github-actions', 'grunweg', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	grunweg assignee:grunweg	4-5730 4 days ago	44-86325 44 days ago	16-66871 16 days
37229	b-mehta author:b-mehta	feat(Algebra/Free): relate the free semigroup and the free monoid	The name is picked to mimic `FreeMagma.toFreeSemigroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	100/3	Mathlib.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/FreeSemigroup.lean	3	9	['adomani', 'b-mehta', 'dagurtomas', 'github-actions', 'mathlib-bors']	dagurtomas assignee:dagurtomas	4-1663 4 days ago	4-2684 4 days ago	7-8497 7 days
37504	chrisflav author:chrisflav	chore(CategoryTheory/Limits): creation of limits and opposites	This is essentially a copy of the file `Mathlib.CategoryTheory.Limits.Preserves.Opposites` with every "preserves" replaced by "creates". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	680/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Preserves/Creates/Opposites.lean	2	3	['dagurtomas', 'github-actions']	nobody	4-976 4 days ago	4-976 4 days ago	1-16795 1 day
36416	j-loreaux author:j-loreaux	feat(Analysis/CStarAlgebra): norms of sums of orthogonal selfadjoint elements	--- - [ ] depends on: #36407 - [ ] depends on: #37569 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author blocked-by-other-PR	128/0	Mathlib/Algebra/Star/BigOperators.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Analysis/CStarAlgebra/GelfandDuality.lean	3	18	['github-actions', 'grunweg', 'j-loreaux', 'loefflerd', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'themathqueen']	loefflerd assignee:loefflerd	3-86368 3 days ago	4-84027 4 days ago	5-65430 5 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 awaiting-author	159/1	Mathlib/NumberTheory/ModularForms/Derivative.lean	1	8	['github-actions', 'seewoo5', 'tb65536', 'wwylele']	tb65536 assignee:tb65536	3-84479 3 days ago	14-40761 14 days ago	1-39967 1 day
36494	MichaelStollBayreuth author:MichaelStollBayreuth	feat(GroupTheory/IndexNSmul): add results on multiplication-by-n in AddCommGroups	This PR adds a new file (to be able to have the required imports) that contains some results related to the (relative) index of subgroups in commutative additive groups and the multiplication-by-`n` map. They will be useful in proving the Northcott property for heights on number fields. --- - [x] depends on: #36458 [some API lemmas for powMonoidHom] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	92/0	Mathlib.lean,Mathlib/GroupTheory/IndexNSmul.lean	2	9	['MichaelStollBayreuth', 'artie2000', 'dagurtomas', 'github-actions', 'mathlib-dependent-issues']	dagurtomas assignee:dagurtomas	3-84116 3 days ago	3-84116 3 days ago	11-3393 11 days
37573	vihdzp author:vihdzp	feat: supremum of `≤ c` ordinals of cardinal `≤ c` has cardinal `≤ c`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	47/14	Mathlib/SetTheory/Cardinal/Ordinal.lean	1	1	['github-actions']	nobody	3-82498 3 days ago	3-83195 3 days ago	3-83185 3 days
36930	vihdzp author:vihdzp	chore: golf `Cardinal.isRegular_succ`	We rewrite the proof so as to avoid working with unbundled relations, and golf it somewhat in the process. --- - [ ] depends on: #36926 - [ ] depends on: #37573 [![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	87/62	Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Cardinal/Regular.lean	4	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-81600 3 days ago	16-52872 16 days ago	0-794 13 minutes
37574	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): Add lemma `Walk.IsCircuit.isCycle_cycleBypass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	8/3	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	1	['github-actions']	nobody	3-81111 3 days ago	3-81180 3 days ago	3-81170 3 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. --- 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	77/37	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Decomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean	4	1	['github-actions']	nobody	3-79750 3 days ago	3-79826 3 days ago	3-79816 3 days
37578	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemma `Walk.IsCircuit.egirth_le_length`	--- - [ ] depends on: #37574 - [ ] depends on: #37505 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	26/3	Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	3-78153 3 days ago	3-78154 3 days ago	0-1530 25 minutes
36613	dagurtomas author:dagurtomas	refactor(CategoryTheory): one-field structure morphisms in the category of types	This PR refactors the category structure on types as follows: We define the one-field structure `TypeCat.Fun` to wrap a function between types, and a `FunLike` instance on it. Then we define a one-field structure `TypeCat.Hom` which wraps a `Fun`. The morphisms in the category `Type u` are defined to be `TypeCat.Hom`, and the `FC` parameter of the `ConcreteCategory` instance is `TypeCat.Fun`. This double nesting allows us to avoid defining a `FunLike` instance on bare functions, which would give two non-reducibly-defeq coercions from morphisms in `Type u` to functions. To promote a function to a morphism in this category, we provide the abbreviation `TypeCat.ofHom f`, as well as a corresponding notation `↾ f`. (Entered as `\upr`.) In the process, we deprecate some declarations that were written specifically for the category of types, such as `FunctorToType.map_comp_apply` and others, which can now be generated by `elementwise`. --- - [ ] depends on: #36834 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	3431/2887	Mathlib.lean,Mathlib/Algebra/Category/AlgCat/Basic.lean,Mathlib/Algebra/Category/AlgCat/Limits.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/CartesianMonoidal.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/Grp/Limits.lean,Mathlib/Algebra/Category/Grp/Yoneda.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/Algebra/Category/ModuleCat/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Sheafify.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackFree.lean,Mathlib/Algebra/Category/ModuleCat/Stalk.lean,Mathlib/Algebra/Category/ModuleCat/Ulift.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/MonCat/Yoneda.lean,Mathlib/Algebra/Category/Ring/Adjunctions.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Category/Semigrp/Basic.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/ShortComplex/ConcreteCategory.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean,Mathlib/AlgebraicGeometry/Cover/Directed.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Subscheme.lean,Mathlib/AlgebraicGeometry/Normalization.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Sites/ConstantSheaf.lean,Mathlib/AlgebraicGeometry/Sites/MorphismProperty.lean,Mathlib/AlgebraicGeometry/Sites/Representability.lean,Mathlib/AlgebraicTopology/ExtraDegeneracy.lean,Mathlib/AlgebraicTopology/Quasicategory/StrictSegal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/Dimension.lean,Mathlib/AlgebraicTopology/SimplicialSet/Finite.lean,Mathlib/AlgebraicTopology/SimplicialSet/HoFunctorMonoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homotopy.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveNondegenerate.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/Op.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/RelativeMorphism.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/TopAdj.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Adhesive/Basic.lean,Mathlib/CategoryTheory/Adjunction/Limits.lean,Mathlib/CategoryTheory/Adjunction/Opposites.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Category/Cat/Limit.lean,Mathlib/CategoryTheory/Category/PartialFun.lean,Mathlib/CategoryTheory/Category/Pointed.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CofilteredSystem.lean,Mathlib/CategoryTheory/Comma/Presheaf/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Elementwise.lean	304	128	['Garmelon', 'JovanGerb', 'bryangingechen', 'dagurtomas', 'github-actions', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	3-75667 3 days ago	3-75668 3 days ago	0-26087 7 hours
37008	BryceT233 author:BryceT233	feat(Algebra/Ring): introduce `pullback` for `RingHom` and `AlgHom`	This PR introduces `pullback` for `RingHom` and `AlgHom` and adds `IsLocalHom`, `IsLocalRing` lemmas related to them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	160/0	Mathlib/Algebra/Algebra/Subalgebra/Prod.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/RingTheory/LocalRing/LocalSubring.lean	3	5	['BryceT233', 'github-actions', 'wwylele']	mattrobball assignee:mattrobball	3-75422 3 days ago	4-31557 4 days ago	14-46773 14 days
37449	dagurtomas author:dagurtomas	feat(Condensed): the free light condensed module on `ℕ∪∞` is internally projective	From [LeanCondensed](https://github.com/dagurtomas/LeanCondensed) Co-authored by: @jonasvanderschaaf --- - [ ] depends on: #37451 - [ ] depends on: #37452 - [ ] depends on: #37453 - [ ] depends on: #37454 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	414/0	Mathlib.lean,Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean,Mathlib/Condensed/Light/Epi.lean,Mathlib/Condensed/Light/Module.lean,Mathlib/Condensed/Light/Sequence.lean,Mathlib/Topology/Category/LightProfinite/Limits.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean	7	11	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot']	nobody	3-74345 3 days ago	6-9523 6 days ago	0-503 8 minutes
37528	kim-em author:kim-em	feat: @[simps] warns when generating defeq abusing lemmas		t-meta merge-conflict	20/0	Mathlib/Tactic/Simps/Basic.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	nobody	3-74344 3 days ago	unknown	0-0 0 seconds
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	53/0	Mathlib.lean,Mathlib/RingTheory/Localization/Saturation.lean	2	11	['alreadydone', 'chrisflav', 'github-actions', 'kckennylau', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	3-69775 3 days ago	32-16472 32 days ago	32-18348 32 days
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	54/2	Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean,Mathlib/Topology/Continuous.lean,MathlibTest/Continuity.lean	5	1	['github-actions']	dwrensha assignee:dwrensha	3-69768 3 days ago	19-21260 19 days ago	19-21258 19 days
36965	vihdzp author:vihdzp	chore(SetTheory/Cardinal): tweak `succ` lemmas	We leave the `SuccOrder` instance unexposed. It doesn't have any particularly good def-eqs, it's simply defined as the infimum of all larger cardinals. We also golf some surrounding theorems. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	49/41	Mathlib/LinearAlgebra/Dimension/Basic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Ordinal/Basic.lean	4	2	['github-actions', 'mathlib-merge-conflicts']	b-mehta assignee:b-mehta	3-69764 3 days ago	10-40703 10 days ago	15-49598 15 days
37536	grunweg author:grunweg	chore: mark coordinateChange_apply_snd simp	--- Inspired by #35978 and its follow-up #37535. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	8/9	Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Topology/FiberBundle/Trivialization.lean	3	4	['github-actions', 'grunweg', 'leanprover-radar']	PatrickMassot assignee:PatrickMassot	3-69760 3 days ago	4-30560 4 days ago	4-30550 4 days
37563	tb65536 author:tb65536	feat(NumberTheory/ArithmeticFunction/LFunction): Euler products are multiplicative	This PR proves that Euler products of multiplicative functions are multiplicative. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory t-algebra label:t-algebra$	17/3	Mathlib/NumberTheory/ArithmeticFunction/LFunction.lean	1	1	['github-actions']	riccardobrasca assignee:riccardobrasca	3-69748 3 days ago	4-5908 4 days ago	4-5899 4 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	41/0	Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Pigeonhole.lean	2	12	['IvanRenison', 'cjrl', 'ghseeli', 'github-actions', 'j-loreaux']	nobody	3-68903 3 days ago	3-68903 3 days ago	9-71315 9 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 label:t-algebra$	80/52	Mathlib.lean,Mathlib/Algebra/Polynomial/FreeMonic.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean	3	2	['Ruben-VandeVelde', 'github-actions']	nobody	3-68808 3 days ago	73-84074 73 days ago	20-81395 20 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 awaiting-author	163/0	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	3	['github-actions', 'mathlib-merge-conflicts', 'thorimur']	dwrensha and thorimur assignee:dwrensha assignee:thorimur	3-68760 3 days ago	3-68760 3 days ago	16-84611 16 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	164/0	Mathlib/Probability/Process/Adapted.lean	1	2	['CoolRmal', 'github-actions']	nobody	3-66293 3 days ago	63-39377 63 days ago	0-23 23 seconds
37576	WenrongZou author:WenrongZou	feat(MvPowerSeries): connection between rename and subst	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	33/6	Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Rename.lean	2	3	['BryceT233', 'WenrongZou', 'github-actions']	nobody	3-66224 3 days ago	3-80045 3 days ago	3-80035 3 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	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	5	['KryptosAI', 'Multramate', 'github-actions', 'ooovi']	nobody	3-66051 3 days ago	3-66109 3 days ago	17-76427 17 days
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	3-53931 3 days ago	unknown	0-0 0 seconds
37216	mbkybky author:mbkybky	feat(Algebra/Module): a finite stably free module `M` is free if it is locally free of rank `1`	We show that a finite stably free module `M` is free if all of its localizations at maximal ideals are free of rank `1` - [ ] depends on: #36951 --- [![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$	148/0	Mathlib.lean,Mathlib/Algebra/Module/StablyFree/Basic.lean,Mathlib/Algebra/Module/StablyFree/FreeOfLocalizedEq.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	3-45215 3 days ago	11-21294 11 days ago	0-304 5 minutes
36910	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory): 4 and 5 lemmas for ComposableArrows 5	Adds versions of the 4 and 5 lemmas for morphisms in `ComposableArrows 5`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	71/2	Mathlib/CategoryTheory/Abelian/DiagramLemmas/Four.lean	1	5	['Brian-Nugent', 'erdOne', 'github-actions']	adamtopaz assignee:adamtopaz	3-43700 3 days ago	3-43700 3 days ago	13-51245 13 days
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	378/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	54	['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	3-41558 3 days ago	3-41023 3 days ago	76-59027 76 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 awaiting-author	254/0	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	17	['ADedecker', 'EtienneC30', 'felixpernegger', 'github-actions']	urkud assignee:urkud	3-39988 3 days ago	3-39988 3 days ago	14-61274 14 days
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	3-39309 3 days ago	3-39332 3 days ago	17-23150 17 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	395/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	3-39265 3 days ago	3-39312 3 days ago	61-22769 61 days
36913	joelriou author:joelriou	feat(CategoryTheory/Monoidal): ring objects	This PR extends the existing API for monoid/group objects to the additive setting using the `to_additive` attribute. This allows to define (commutative) ring objects in a cartesian monoidal category. (This mostly builds on previous work by the Toric project.) --- - [ ] depends on: #37587 - [x] depends on: #37167 - [x] depends on: #37265 - [x] depends on: #37263 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-category-theory blocked-by-other-PR	358/28	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Ring.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Ring.lean	6	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-39038 3 days ago	17-4034 17 days ago	0-2 2 seconds
31560	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Topology/Sion): the minimax theorem of von Neumann - Sion	Prove `Sion.exists_isSaddlePointOn` : Let X and Y be convex subsets of topological vector spaces E and F, X being moreover compact, and let f : X × Y → ℝ be a function such that - for all x, f(x, ⬝) is upper semicontinuous and quasiconcave - for all y, f(⬝, y) is lower semicontinuous and quasiconvex Then inf_x sup_y f(x,y) = sup_y inf_x f(x,y). The classical case of the theorem assumes that f is continuous, f(x, ⬝) is concave, f(⬝, y) is convex. As a particular case, one get the von Neumann theorem where f is bilinear and E, F are finite dimensional. We follow the proof of Komiya (1988). ## Remark on implementation * The essential part of the proof holds for a function `f : X → Y → β`, where `β` is a complete dense linear order. * We have written part of it for just a dense linear order, * On the other hand, if the theorem holds for such `β`, it must hold for any linear order, for the reason that any linear order embeds into a complete dense linear order. Although the Dedekind McNeille completion (docs#DedekindCut) furnishes a complete lattice, it is not dense in general, so that this result does not seem to be known to Mathlib yet. * When `β` is `ℝ`, one can use `Real.toEReal` and one gets a proof for `ℝ`. ## TODO Give particular important cases (eg, bilinear maps in finite dimension). Co-authored with @ADedecker --- - [x] depends on: #31548 - [x] depends on: #31547 - [x] depends on: #31558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	639/0	Mathlib.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Topology/NhdsWithin.lean,Mathlib/Topology/Semicontinuity/Basic.lean,Mathlib/Topology/Sion.lean,docs/references.bib	6	44	['AntoineChambert-Loir', 'github-actions', 'j-loreaux', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'thorimur']	dwrensha, j-loreaux, kmill assignee:kmill assignee:dwrensha assignee:j-loreaux	3-37812 3 days ago	3-37968 3 days ago	109-30186 109 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	3-33774 3 days ago	3-38405 3 days ago	26-21993 26 days
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	3-33692 3 days ago	724-17078 724 days ago	0-1223 20 minutes
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	3-33278 3 days ago	3-33278 3 days ago	13-10710 13 days
37505	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `SimpleGraph.length_cycleBypass_le`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	3/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	3-33238 3 days ago	5-17043 5 days ago	5-17033 5 days
35405	xroblot author:xroblot	feat(RamificationInertia): add `ramificationIdx_le_ramificationIdx` and `inertiaDeg_le_inertiaDeg`	Assume that `Q` is over `P` that is over `p`. We prove that: - `Ideal.ramificationIdx P Q ≤ Ideal.ramificationIdx p Q` - `Ideal.inertiaDeg P Q ≤ Ideal.inertiaDeg p Q` Note: These results also follow from [Ideal.ramificationIdx_algebra_tower](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/RamificationInertia/Basic.html#Ideal.ramificationIdx_algebra_tower) and [Ideal.inertiaDeg_algebra_tower](https://leanprover-community.github.io/mathlib4_docs/Mathlib/NumberTheory/RamificationInertia/Basic.html#Ideal.inertiaDeg_algebra_tower) but they are proved here in a slightly more general situation. --- - [x] depends on: #35483 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	24/0	Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean	2	9	['Multramate', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'xroblot']	MichaelStollBayreuth and alexjbest assignee:alexjbest assignee:MichaelStollBayreuth	3-29676 3 days ago	3-29676 3 days ago	47-20255 47 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`. * `TopologicalSpace.IsClosedSubbasis s`: Given a topological space `α`, `s : Set (Set α)` is a closed subbasis if the topology on `α` equals `generateFrom { uᶜ \| u ∈ 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	18	['github-actions', 'scholzhannah']	PatrickMassot assignee:PatrickMassot	3-28972 3 days ago	3-28972 3 days ago	14-4563 14 days
36772	xroblot author:xroblot	feat(FieldTheory/IntermediateField): define the image of an intermediate field in a larger extension	Given a tower of fields `K ⊆ L ⊆ M` and an intermediate field `F` of `L/K`, defines `IntermediateField.extendTop F M` as the image of `F` under` L →ₐ[K] M`, together with instances transferring `Algebra`, `IsFractionRing` and `IsIntegralClosure` to the image. The main motivation is to embed a subextension `F/K` of `L/K` into a larger extension `M/K`. This is useful for instance when one needs `M/K` to be Galois. This construction will be useful in a later PR to prove that the compositum of two unramified extensions is unramified. Indeed, the result is first proved when the two extensions are `IntermediateField K L` with `L/K` Galois, and then in the general case (see #36843) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	120/0	Mathlib.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/FieldTheory/IntermediateField/ExtendTop.lean,Mathlib/RingTheory/Localization/FractionRing.lean	4	12	['WilliamCoram', 'github-actions', 'plp127', 'robin-carlier', 'xroblot']	chrisflav assignee:chrisflav	3-27950 3 days ago	3-27950 3 days ago	16-74756 16 days
36951	mbkybky author:mbkybky	feat(Algebra/Module): define stably free modules	We define stably free modules: a module `M` over a commutative ring `R` is called stably free if there exists a finite free module `N` over `R` such that `M ⊕ N` is free. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	67/0	Mathlib.lean,Mathlib/Algebra/Module/StablyFree/Basic.lean	2	3	['dagurtomas', 'github-actions']	dagurtomas assignee:dagurtomas	3-27927 3 days ago	3-27927 3 days ago	15-62192 15 days
36524	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/SpecificGroups/Alternating/Simple): simplicity of the alternating groups	This is the conclusion of the story of the proof of simplicity of the alternating group using the Iwasawa criterion. * `Equiv.Perm.iwasawaStructure_two`: the natural `IwasawaStructure` of `Equiv.Perm α` acting on `Nat.Combination α 2` Its commutative subgroups consist of the permutations with support in a given element of `Nat.Combination α 2`. They are cyclic of order 2. * `alternatingGroup_of_le_of_normal`: If `α` has at least 5 elements, then a nontrivial normal subgroup of `Equiv.Perm α` contains the alternating group. * `alternatingGroup.iwasawaStructure_three`: the natural `IwasawaStructure` of `alternatingGroup α` acting on `Nat.Combination α 3` Its commutative subgroups consist of the permutations with support in a given element of `Nat.Combination α 2`. They are cyclic of order 3. * `alternatingGroup.iwasawaStructure_three`: the natural `IwasawaStructure` of `alternatingGroup α` acting on `Nat.Combination α 4` Its commutative subgroups consist of the permutations of cycleType (2, 2) with support in a given element of `Nat.Combination α 2`. They have order 4 and exponent 2 (`IsKleinFour`). * `alternatingGroup.normal_subgroup_eq_bot_or_eq_top`: If `α` has at least 5 elements, then a nontrivial normal subgroup of `alternatingGroup` is `⊤`. * `alternatingGroup.isSimpleGroup`: If `α` has at least 5 elements, then `alternatingGroup α` is a simple group. --- - [x] depends on: #33082 - [ ] depends on: #36983 - [ ] depends on: #37026 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import blocked-by-other-PR	356/12	Mathlib.lean,Mathlib/Data/Finite/Perm.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Combination.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Centralizer.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Simple.lean	8	40	['AntoineChambert-Loir', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier', 'tb65536']	tb65536 assignee:tb65536	3-27549 3 days ago	18-31394 18 days ago	3-14257 3 days
37108	xroblot author:xroblot	feat(NumberTheory/DirichletCharacter): characterise conductor set as multiples of conductor	Add two lemmas about Dirichlet character conductor sets : - `FactorsThrough.mono`: if `χ` factors through `d` and `d ∣ m ∣ n`, then `χ` factors through `m`. - `mem_conductorSet_iff_conductor_dvd`: for` d ∣ n`, `d ∈ χ.conductorSet` iff `χ.conductor ∣ d`. --- - [x] depends on: #37425 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	15/0	Mathlib/NumberTheory/DirichletCharacter/Basic.lean	1	6	['MichaelStollBayreuth', 'github-actions', 'mathlib-dependent-issues', 'xroblot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	3-26712 3 days ago	3-26244 3 days ago	6-2722 6 days
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	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	7	['artie2000', 'github-actions', 'vihdzp']	nobody	3-25043 3 days ago	5-75265 5 days ago	0-3200 53 minutes
35593	chrisflav author:chrisflav	feat(RingTheory/Extension): naive cotangent complex commutes with flat base change	From Pi1. --- - [x] depends on: #35544 - [x] depends on: #35557 - [x] depends on: #35594 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	218/16	Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/BaseChange.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Ideal/Cotangent.lean	4	12	['chrisflav', 'github-actions', 'mariainesdff', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	mariainesdff and riccardobrasca assignee:riccardobrasca assignee:mariainesdff	3-24969 3 days ago	3-24969 3 days ago	15-68662 15 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) . 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. 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. Instead, 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 to deal with `(n • b) + -b` etc. The idea is to ensure that any consecutive chains of `b`'s and `-b`'s and `z • b`'s will all get amalgamated, 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	183/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/AddGroup.lean,MathlibTest/AddGroup.lean	4	3	['github-actions', 'kbuzzard']	JovanGerb assignee:JovanGerb	3-24850 3 days ago	13-71030 13 days ago	13-72263 13 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	3-24635 3 days ago	58-1343 58 days ago	0-397 6 minutes
37566	harahu author:harahu	doc(Order): 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/)	t-order	15/7	Mathlib/Order/Circular.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean	7	1	['Multramate', 'github-actions']	nobody	3-24528 3 days ago	4-5266 4 days ago	4-5256 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	131/116	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/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/SimpIntro.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean	17	1	['Multramate', 'github-actions']	nobody	3-24255 3 days ago	10-74188 10 days ago	10-79875 10 days
36220	harahu author:harahu	doc(misc): update two theorem names	- https://www.wikidata.org/wiki/Q1543149 carries the name "Sokhotski–Plemelj theorem" - While https://www.wikidata.org/wiki/Q2226807 does carry the name "Vantieghems theorem", I assume the s is intended to be possessive, since the mathematician credited with the result is called Emmanuel Vantieghem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	2/2	docs/1000.yaml	1	7	['dwrensha', 'github-actions', 'harahu']	nobody	3-24146 3 days ago	31-85705 31 days ago	31-85695 31 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	15	['IvanRenison', 'YaelDillies', 'github-actions', 'mkaratarakis']	nobody	3-23105 3 days ago	3-24256 3 days ago	4-56259 4 days
36434	mariainesdff author:mariainesdff	feat(RingTheory.DividedPowerAlgebra.Init.lean): add weak universal property and functoriality	Co-authored by @AntoineChambert-Loir. --- - [x] depends on: #35804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	216/2	Mathlib/RingTheory/DividedPowerAlgebra/Init.lean	1	18	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	3-22410 3 days ago	3-22410 3 days ago	3-31976 3 days
37037	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add lemmas	Co-authored by: @AntoineChambert-Loir. --- - [x] depends on: #36444 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	68/0	Mathlib/RingTheory/PowerSeries/Substitution.lean	1	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	chrisflav assignee:chrisflav	3-20828 3 days ago	3-20828 3 days ago	4-43292 4 days
36992	JovanGerb author:JovanGerb	feat(RefinedDiscrTree/Lookup): use parallellism in lookup	This PR adds parallellism to the `RefinedDiscrTree` lookup. Previously, only constructing the root node of the discrimination tree used parallellism. But it turns out some of the child nodes can be pretty big too. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	40/7	Mathlib/Lean/FoldEnvironment.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean	2	4	['adamtopaz', 'github-actions']	adamtopaz assignee:adamtopaz	3-19248 3 days ago	3-19370 3 days ago	11-77995 11 days
37400	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): endpoints of a path have at most one neighbor in the path	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	2	['Rida-Hamadani', 'github-actions']	nobody	3-18072 3 days ago	6-63753 6 days ago	6-63743 6 days
37543	EtienneC30 author:EtienneC30	feat: lemmas related to setBernoulli	`setBer(u, p)` only gives mass to families of sets contained in `u`, thus `setBer(u, p) S = setBer(u, p) {s \| s ∈ S ∧ s ⊆ u}`. Add a `Measure.real` version of `setBernoulli_singleton`. `setBer(∅, p) = Measure.dirac ∅`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	28/0	Mathlib/Probability/Distributions/SetBernoulli.lean	1	5	['DavidLedvinka', 'github-actions', 'kex-y']	kex-y assignee:kex-y	3-17289 3 days ago	4-22528 4 days ago	4-22518 4 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 awaiting-author	700/0	Mathlib.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean	3	200	['Rida-Hamadani', 'github-actions', 'grunweg', 'idontgetoutmuch']	ocfnash assignee:ocfnash	3-16400 3 days ago	5-38711 5 days ago	45-7453 45 days
36474	SmwYin author:SmwYin	feat(NumberTheory/ModularForms/QExpansion): update qExpansion API for more general objects	This PR generalises several lemmas from `ModularFormClass` and `ModularForm` to functions on the upper half plane that are periodic, holomorphic, and bounded at infinity. This allows us to study the _q_-expansion of functions such as `q * j`, where `j` denotes the _j_-function. The specialised `ModularFormClass` and `ModularForm` lemmas are retained as wrappers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory new-contributor	329/195	Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	5	24	['CBirkbeck', 'SmwYin', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	MichaelStollBayreuth assignee:MichaelStollBayreuth	3-15154 3 days ago	5-22095 5 days ago	5-22119 5 days
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	289/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/TorsionTheory/Basic.lean	2	11	['farmanb', 'github-actions', 'joelriou', 'plp127']	nobody	3-14602 3 days ago	unknown	0-0 0 seconds
37542	martinwintermath author:martinwintermath	chore(LinearAlgebra/Dual): deprecate `Module.dualPairing`	- deprecate `Module.dualPairing` (and associated lemmas) since merely synonym for identity (essentially always easier to just use `.id`, see next bullet point) - remove use of deprecated lemmas - remove from file doc-string - generalize `dualPairing_nondegenerate` + rename to `id_nondegenerate` - add accompanying `id_separatingLeft`, `id_separatingRight` and versions for `Dual.eval` (similar lemmas have also been proposed in #34487) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	46/24	Mathlib/Analysis/Convex/Cone/TensorProduct.lean,Mathlib/Geometry/Convex/Cone/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean	4	3	['artie2000', 'github-actions']	nobody	3-12890 3 days ago	4-19390 4 days ago	4-19380 4 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`](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 https://github.com/WuProver/groebner_proj. --- It's upstream 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	245/2	Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	2	5	['github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-11509 3 days ago	3-12947 3 days ago	3-15034 3 days
37434	mariainesdff author:mariainesdff	feat(Algebra/Group/Submonoid/Basic): add lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/0	Mathlib/Algebra/Group/Submonoid/Basic.lean	1	3	['FernandoChu', 'github-actions', 'j-loreaux', 'robin-carlier']	nobody	3-10454 3 days ago	3-10454 3 days ago	3-18550 3 days
34851	dennj author:dennj	feat(Data/Matrix/Mul): add diagonal and transpose lemmas for vector operations	This adds three lemmas for matrix-vector operations that serve as foundational support for future ML formalization: - `vecMul_diagonal_dotProduct`: weighted inner product `x ᵥ* diagonal d ⬝ᵥ y = ∑ i, d i * x i * y i` - `dotProduct_transpose_mulVec`: bilinear form symmetry `x ⬝ᵥ Aᵀ ᵥ y = y ⬝ᵥ A ᵥ x` - `mul_diagonal_mulVec`: column-weighted sum `(A * diagonal d) ᵥ x = ∑ i, (d i x i) • A.col i` These are basic linear algebra identities involving diagonal matrices and vector operations that appear frequently in machine learning contexts (weighted inner products, attention mechanisms, feature scaling, diagonal preconditioning).	t-data new-contributor	22/0	Mathlib/Data/Matrix/Mul.lean	1	7	['dennj', 'eric-wieser', 'github-actions', 'themathqueen']	TwoFX assignee:TwoFX	3-9988 3 days ago	60-85394 60 days ago	60-85384 60 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	117/7	Mathlib.lean,Mathlib/CategoryTheory/Sites/Spaces.lean,Mathlib/Topology/Sheaves/Module.lean,Mathlib/Topology/Sheaves/Over.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean	5	4	['github-actions', 'joelriou']	nobody	3-9757 3 days ago	33-16832 33 days ago	0-3328 55 minutes
34705	mpenciak author:mpenciak	feat(RingTheory): Grassmannian functor	This PR shows that the association `A → G(k, (A ⊗[R] M); A)` for an `R`-algebra `A` and `R`-module `M` forms a functor. (AI disclosure: an early version of this PR was prepared with the help of Claude) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory LLM-generated large-import	138/2	Mathlib/LinearAlgebra/TensorProduct/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Grassmannian.lean	3	12	['chrisflav', 'github-actions', 'mathlib-merge-conflicts', 'mpenciak', 'robin-carlier']	chrisflav assignee:chrisflav	3-9622 3 days ago	3-12287 3 days ago	45-83494 45 days
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		189/0	Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/MeasureTheory/Measure/ResolventTransform.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-9324 3 days ago	3-9368 3 days ago	3-77283 3 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 label:t-algebra$	41/14	Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Data/Finset/NatDivisors.lean,Mathlib/NumberTheory/ArithmeticFunction/Misc.lean	3	5	['AlexKontorovich', 'arajasek', 'github-actions']	alreadydone assignee:alreadydone	3-8769 3 days ago	3-8719 3 days ago	22-80459 22 days
37592	erdOne author:erdOne	feat: set up API for `ConvexSpace`	We introduce `sConvexCombo` and the indexed version `iConvexCombo` as the main API for `ConvexSpace` and prove lemmas around the new definitions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import maintainer-merge label:t-algebra$	452/133	Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/LinearAlgebra/ConvexSpace.lean,Mathlib/LinearAlgebra/ConvexSpace/AffineSpace.lean	3	15	['YaelDillies', 'erdOne', 'github-actions']	nobody	3-7974 3 days ago	3-23902 3 days ago	3-25159 3 days
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	4	['Rida-Hamadani', 'SnirBroshi', 'github-actions']	nobody	3-4682 3 days ago	6-62193 6 days ago	6-62327 6 days
34182	IlPreteRosso author:IlPreteRosso	refactor(Data/Finsupp): deprecate direct single ↔ Set.indicator shortcuts, add indicator_eq_set_indicator	Routes Finsupp.single ↔ Set.indicator through Pi.single instead of direct shortcuts. Adds `indicator_eq_set_indicator` bridging `Finsupp.indicator` and `Set.indicator` for non-dependent functions. Deprecates `single_eq_set_indicator` and `single_eq_indicator` — users should compose through `single_eq_pi_single` + `Set.indicator_singleton` instead. Golfs `single_eq_update` via `single_eq_pi_single`. Continues #34083.	t-data new-contributor	27/19	Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Single.lean	2	31	['IlPreteRosso', 'eric-wieser', 'github-actions', 'mathlib-bors', 'urkud']	TwoFX assignee:TwoFX	3-4681 3 days ago	3-10942 3 days ago	75-66124 75 days
37327	ldct author:ldct	feat: `Complex.tan, Complex.tanh` are meromorphic	From `AlexKontorovich/PrimeNumberTheoremAnd` project --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	39/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Meromorphic.lean	2	8	['github-actions', 'j-loreaux', 'ldct', 'themathqueen']	j-loreaux assignee:j-loreaux	3-3114 3 days ago	3-3167 3 days ago	5-4278 5 days
37553	grunweg author:grunweg	Golf misc	--- - [ ] depends on: #37462 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR merge-conflict	280/292	Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1988Q6.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.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/Archimedean/Basic.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/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.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/PhragmenLindelof.lean,Mathlib/Analysis/Complex/Trigonometric.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/MellinInversion.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Field/Approximation.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.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/Combinatorics/SimpleGraph/Regularity/Uniform.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,Mathlib/Dynamics/Ergodic/AddCircle.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Integral/Gamma.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/MeasureTheory/Measure/RegularityCompacts.lean,Mathlib/MeasureTheory/OuterMeasure/Caratheodory.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/PythagoreanTriples.lean	100	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-2092 3 days ago	4-16788 4 days ago	0-1 1 second
37617	harahu author:harahu	doc(FieldTheory): 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/)	t-algebra label:t-algebra$	33/31	Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/FieldTheory/RatFunc/Basic.lean	7	1	['github-actions']	nobody	3-1310 3 days ago	3-1381 3 days ago	3-1371 3 days
37398	eric-wieser author:eric-wieser	chore: lemmas about `Matrix.submatrix` and `Matrix.kroneckerMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra easy label:t-algebra$	17/0	Mathlib/LinearAlgebra/Matrix/Kronecker.lean	1	2	['github-actions', 'themathqueen']	nobody	2-85785 2 days ago	6-63244 6 days ago	0-1128 18 minutes
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	1219/220	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/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	12	12	['eric-wieser', 'github-actions', 'lecopivo', 'mathlib-merge-conflicts', 'thorimur']	alexjbest and thorimur assignee:alexjbest assignee:thorimur	2-85739 2 days ago	3-67191 3 days ago	7-45984 7 days
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/)		56/55	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Semi.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Equiv/TypeTags.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Group/Cyclic.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/Hom/TypeTags.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/Matroid/Map.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean,Mathlib/Control/Traversable/Equiv.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/BitVec.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/Data/TypeVec.lean,Mathlib/Geometry/Manifold/Immersion.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/Tactic/Linter/UnusedInstancesInType.lean,Mathlib/Topology/Compactness/Lindelof.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Sheaves/CommRingCat.lean,docs/references.bib	39	9	['euprunin', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts']	nobody	2-85696 2 days ago	25-74499 25 days ago	7-55245 7 days
35250	vlad902 author:vlad902	feat(SimpleGraph): redefine `cycleGraph` independent of `circulantGraph`	Right now the `cycleGraph` definition relies on `circulantGraph` which requires importing Group definitions from the algebra hierarchy. This causes large-imports for me in later PRs where I try to make more widespread use of cycleGraphs, so here I redefine it to be its own independent object, and leave moving it from `Circulant.lean` to another PR (this is parallel to #35084.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	10/10	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	5	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'vihdzp', 'vlad902']	nobody	2-85607 2 days ago	52-25831 52 days ago	52-25821 52 days
36682	harahu author:harahu	chore(Data): avoid lazy continuation in md lists	We replace lazy continuation lines in lists with either: - indented lines, to signify that the line is indeed a continuation line; or - a newline, where the continuation line(s) were in fact intended to be disconnected from the list. We do this because lazy continuation is a markdown footgun that one does well to avoid. We also standardize indentation such that continuation lines now line up with the first line of the item they're continuing. This seems to be the solution enforced by markdown formatters, e.g. `mdformat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	18/7	Mathlib/Data/Bracket.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/FlagRange.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Multiset/DershowitzManna.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Data/Stream/Defs.lean	9	1	['github-actions']	joneugster assignee:joneugster	2-85388 2 days ago	22-20968 22 days ago	22-20958 22 days
33463	khwilson author:khwilson	feat(Mathlib/Analysis/Polynomial/MahlerMeasure): Mahler Measure for other rings	Define `mahlerMeasure'` which allows you specify a norm preserving map `v` from any `NormedRing A` (or more general) to `ℂ`. Also provide wrappers around the main `mahlerMeasure` lemmas that are used for estimation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis maintainer-merge	98/5	Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/NumberTheory/MahlerMeasure.lean	2	40	['github-actions', 'j-loreaux', 'khwilson', 'kim-em', 'plp127', 'vlad902']	nobody	2-84507 2 days ago	3-24589 3 days ago	3-29641 3 days
36376	jessealama author:jessealama	feat(SimpleGraph): bridge from Perm.IsCycle to IsHamiltonian	This PR provides `IsHamiltonian.ofPerm`, 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/Combinatorics/SimpleGraph/Walks/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`: - `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers `Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`: - `edge_ne_of_isCycleOn`: edge distinctness for cycle-on permutations - `IsHamiltonian.ofPerm`: the main theorem - [ ] depends on: #36307	large-import	264/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	7	36	['SnirBroshi', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-84213 2 days ago	2-84215 2 days ago	14-40067 14 days
37380	tb65536 author:tb65536	feat(RingTheory/Localization/BaseChange): tensor product commutes with localizations	This PR adds a few isomorphisms for tensor products commuting with localizations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	53/0	Mathlib/RingTheory/Localization/BaseChange.lean	1	5	['github-actions', 'robin-carlier']	nobody	2-82050 2 days ago	2-82050 2 days ago	6-65627 6 days
37104	tb65536 author:tb65536	feat(RingTheory/Flat/FaithfullyFlat/Basic): prove `IsNoetherian` and `IsArtinian` from faithfully flat base change	This PR proves that if the base change of a module `M` along a faithfully flat ring homomorphism is Noetherian or Artinian, then so is `M`. The file `Artinian/Module` has become rather heavy, so I split off a `Artinian/Defs` file to avoid the large import. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	121/39	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Artinian/Defs.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean	5	2	['github-actions', 'robin-carlier']	nobody	2-81315 2 days ago	2-81315 2 days ago	12-58481 12 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	145/13	Mathlib/Topology/Compactness/CountablyCompact.lean,Mathlib/Topology/Inseparable.lean,docs/references.bib	3	26	['ADedecker', 'CoolRmal', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'scholzhannah']	PatrickMassot assignee:PatrickMassot	2-80423 2 days ago	2-80449 2 days ago	7-78523 7 days
36657	BryceT233 author:BryceT233	feat(RingTheory): adds two lemmas on `Module.length`	This PR adds two lemmas regarding the length of modules: * `Submodule.length_le_restrictScalar` shows that the length of an $R$-submodule is less than or equal to its length as an $A$-submodule under scalar restriction. * `Submodule.length_quotient_lt` shows that for a module of finite length, the length of a quotient module $M \big/ p$ is strictly less than the length of $M$ when the submodule $p$ is non-trivial. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	21/0	Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/Length.lean	2	11	['BryceT233', 'Raph-DG', 'WenrongZou', 'github-actions', 'robin-carlier']	chrisflav assignee:chrisflav	2-79100 2 days ago	2-79100 2 days ago	22-28858 22 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	25/4	Mathlib/Combinatorics/SimpleGraph/Maps.lean	1	1	['github-actions']	nobody	2-75952 2 days ago	2-76026 2 days ago	2-76016 2 days
37561	IvanRenison author:IvanRenison	feat(Data/List): add lemma `List.notMem_subset`	--- Zulip question: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/List.2EnotMem_subset/with/583146215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	3/0	Mathlib/Data/List/Basic.lean	1	1	['github-actions']	nobody	2-72372 2 days ago	4-8468 4 days ago	4-8458 4 days
37471	NoahW314 author:NoahW314	feat(RingTheory/MvPolynomial/MonomialOrder): add `leadingTerm_mul` lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	7/0	Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	1	7	['Hagb', 'Maldooor', 'NoahW314', 'WilliamCoram', 'github-actions']	nobody	2-71938 2 days ago	5-58715 5 days ago	5-58705 5 days
26735	Raph-DG author:Raph-DG	feat(AlgebraicGeometry): The codimension of a point of a scheme is equal to the krull dimension of the stalk	In this PR we show that the codimension of a point in a scheme is equal to the krull dimension of the local ring at that point, as in stacks 02IZ. --- The proof of the main result `stalk_dim_eq_coheight` is currently a bit long for my (and I suspect the broader community's) tastes. That said, I'm not quite sure the best way to break it into pieces, any comments would be very much appreciated! - [x] depends on: #26204 [For the notion of codimension, here we are using the coheight in the specialization order. ] - [x] depends on: #26225 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	148/0	Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Topology/Continuous.lean,Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sets/Closeds.lean	6	62	['Raph-DG', 'chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	adamtopaz and erdOne assignee:adamtopaz assignee:erdOne	2-69905 2 days ago	12-14879 12 days ago	57-75171 57 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 label:t-algebra$	50/1	Mathlib/Algebra/Group/Submonoid/Support.lean	1	1	['github-actions']	eric-wieser assignee:eric-wieser	2-69899 2 days ago	10-70032 10 days ago	10-70022 10 days
37478	YaelDillies author:YaelDillies	chore(Order): make `CompleteDistribLattice.MinimalAxioms.of` semireducible	This is part of the greater discussion about whether we should make all `def`s appearing in instances `implicit_reducible`. I believe the answer in this case is pretty clearly yes sinced the sole purpose of `CompleteLattice.MinimalAxioms` is to build instances. From APAP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	2/0	Mathlib/Order/CompleteBooleanAlgebra.lean	1	1	['github-actions']	Vierkantor assignee:Vierkantor	2-69894 2 days ago	3-34752 3 days ago	3-36317 3 days
37537	grunweg author:grunweg	feat: continuousLinearMapAt_apply_of_mem	Also mark `(Pre)Trivialization.coe_linearMapAt_of_mem` simp. From #36036, i.e. the path towards Ehresmann connections. Co-authored by: Patrick Massot --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-topology	18/21	Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Riemannian.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Riemannian.lean	4	4	['github-actions', 'grunweg', 'leanprover-radar']	ocfnash assignee:ocfnash	2-69894 2 days ago	4-23692 4 days ago	4-23726 4 days
37538	harahu author:harahu	doc(Probability): 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/)	t-measure-probability	7/4	Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/Kernel/Category/SFinKer.lean,Mathlib/Probability/Kernel/Category/Stoch.lean,Mathlib/Probability/Notation.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/Probability/StrongLaw.lean	6	1	['Multramate', 'github-actions']	kex-y assignee:kex-y	2-69893 2 days ago	4-29344 4 days ago	4-29334 4 days
37583	huaizhangchu author:huaizhangchu	feat(Probability): add mean and variance of Poisson distribution	This PR adds the mean and variance of the Poisson distribution over ℕ. ### Main results - `poissonMeasure_mean`: the mean of `poissonMeasure r` equals `r` - `poissonMeasure_moment_two`: the second moment equals `r² + r` - `poissonMeasure_variance`: the variance equals `r` ### Implementation notes The moments are computed via descending factorial moments. We first prove `hasSum` lemmas for `E[X]` and `E[X(X-1)]`, then obtain `E[X²] = E[X(X-1)] + E[X] = r² + r`, from which the variance follows. ### Related lemmas - `hasSum_poissonMeasure_nat`: weighted sum for the mean - `hasSum_poissonMeasure_descFactorial_two`: weighted sum for the second descending factorial moment - `hasSum_poissonMeasure_sq`: weighted sum for the second moment - `memLp_two_nat_poissonMeasure`: integrability condition for variance	t-measure-probability large-import new-contributor	100/0	Mathlib/Probability/Distributions/Poisson/Basic.lean	1	2	['github-actions']	RemyDegenne assignee:RemyDegenne	2-69891 2 days ago	3-63684 3 days ago	3-63674 3 days
37587	joelriou author:joelriou	feat(CategoryTheory/Monoidal): use to_additive for the Yoneda embedding of group objects	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	74/27	Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean	1	1	['github-actions']	robin-carlier assignee:robin-carlier	2-69889 2 days ago	3-39899 3 days ago	3-39889 3 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics blocked-by-other-PR	665/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/DoubleCounting.lean,Mathlib/Combinatorics/Enumerative/LatinSquare.lean,Mathlib/Combinatorics/Pigeonhole.lean,docs/references.bib	5	78	['SnirBroshi', 'cjrl', 'eric-wieser', 'ghseeli', 'github-actions', 'mathlib-dependent-issues', 'vlad902']	nobody	2-62296 2 days ago	3-7346 3 days ago	16-40743 16 days
36320	ZRTMRH author:ZRTMRH	feat(Combinatorics): add Schreier graph definition and covering property	Defines Schreier graphs as quivers with labeled edges. `SchreierGraph V ι`: type alias for vertices with quiver structure `schreierGraphLabelling`: prefunctor extracting edge labels `schreierGraphLabelling_isCovering`: the labelling is a covering for group actions `schreierGraph_action_commute`: label-preserving maps commute with the action Ported from [Lean 3 PR #18693](https://github.com/leanprover-community/mathlib3/pull/18693). This PR was written with AI assistance (Claude). The code has been reviewed by the author and their advisor. --- This is the first in a series of PRs splitting #35467 into smaller pieces, as suggested by reviewers. Upcoming PRs will add word evaluation, paths, connectivity, automorphisms, examples, and Cayley sum graphs.	t-combinatorics new-contributor LLM-generated	180/0	Mathlib.lean,Mathlib/Combinatorics/Quiver/Schreier.lean,docs/references.bib	3	33	['AntoineChambert-Loir', 'YaelDillies', 'ZRTMRH', 'github-actions']	nobody	2-61268 2 days ago	3-20738 3 days ago	21-80875 21 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	2-60699 2 days ago	2-60699 2 days ago	16-42277 16 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	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	2	['github-actions']	nobody	2-59296 2 days ago	3-22542 3 days ago	3-24306 3 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` - [ ] depends on: #37111	t-computability new-contributor large-import blocked-by-other-PR merge-conflict	640/77	Mathlib/Computability/Partrec.lean,Mathlib/Computability/RecursiveIn.lean,Mathlib/Computability/TuringDegree.lean	3	5	['Komyyy', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	2-51368 2 days ago	13-18056 13 days ago	0-62206 17 hours
37475	euprunin author:euprunin	chore: golf proofs	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): * `✅️ LinearMap.IsSymmetric.orthogonalComplement_iSup_eigenspaces_eq_bot`: unchanged 🎉 * `✅️ LinearOrder.strong_induction_of_finite`: unchanged 🎉 * `✅️ ProbabilityTheory.poissonPMFRealSum`: 140 ms before, <30 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/)		6/29	Mathlib/Analysis/InnerProductSpace/Spectrum.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Probability/Distributions/Poisson/Basic.lean	3	12	['euprunin', 'felixpernegger', 'github-actions', 'grunweg']	nobody	2-45648 2 days ago	2-45648 2 days ago	2-53077 2 days
31425	robertmaxton42 author:robertmaxton42	feat(Topology): implement delaborators for non-standard topology notation	Add delaborators for unary and binary notation related to non-standard topologies in the TopologicalSpace namespace. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	265/5	Mathlib.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Util/DelabNonCanonical.lean,MathlibTest/Delab/TopologicalSpace.lean	4	49	['eric-wieser', 'github-actions', 'j-loreaux', 'jcommelin', 'kckennylau', 'robertmaxton42']	alreadydone assignee:alreadydone	2-44691 2 days ago	3-20952 3 days ago	116-53780 116 days
36896	PieterCuijpers author:PieterCuijpers	feat (Algebra/Order/Quantale): isMulIdempotent, isMulLeftsided, isMulRightsided, isMulTwosided and strict versions	* Adding definitions of quantale elements being idempotent, leftsided, rightsided, and twosided, and strict versions I'd value some discussion on whether especially the definition of isMulIdempotent would belong here, since it applies to semigroups in general. I only see definitions of IdempotentOp in the library so far, focussing on operators that are fully idempotent, while in the study of Quantales it seems that subquantales of elements that are idempotent in the original are also interesting. This argues the need for having definitions on separate elements. Also, should we include these definitions in the main Algebra/Order/Quantale.lean file, or start a separate file for them? And I have a few basic theorems I would like to include, but invite suggestions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	81/1	Mathlib/Algebra/Order/Quantale.lean	1	4	['NoahW314', 'github-actions']	kim-em assignee:kim-em	2-43438 2 days ago	17-35595 17 days ago	17-35585 17 days
32807	WilliamCoram author:WilliamCoram	feat: Define the Gauss norm for MvPowerSeries	We adjust the current definition for Gauss norm on power series to work for multivariate power series. If this seems acceptable I can refactor the single variable case. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	124/0	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/GaussNorm.lean	2	28	['Multramate', 'WilliamCoram', 'erdOne', 'fbarroero', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	erdOne assignee:erdOne	2-41290 2 days ago	2-55468 2 days ago	65-28253 65 days
37046	justus-springer author:justus-springer	feat(CategoryTheory/Triangulated): Generators in triangulated categories	Define strong and classical generators in triangulated categories. See also the [zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Generators.20in.20triangulated.20categories/with/573268390). --- - [x] depends on: #37080 - [x] depends on: #37081 - [x] depends on: #37083 - [x] depends on: #37085 - [x] depends on: #37090 - [x] depends on: #37442 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	259/0	Mathlib.lean,Mathlib/CategoryTheory/ObjectProperty/ClosureShift.lean,Mathlib/CategoryTheory/Triangulated/Generators.lean,docs/references.bib	4	18	['github-actions', 'joelriou', 'justus-springer', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	robin-carlier assignee:robin-carlier	2-39698 2 days ago	2-39593 2 days ago	6-19563 6 days
35912	WenrongZou author:WenrongZou	feat(RingTheory/FormalGroup): definition and examples of formal group	--- Definition of one dimensional formal group law over commutative ring and some examples of formal group law. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	241/0	Mathlib.lean,Mathlib/RingTheory/FormalGroup/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Ring/NamePowerVars.lean,docs/references.bib	6	36	['Multramate', 'WenrongZou', 'artie2000', 'erdOne', 'github-actions', 'jcommelin', 'wwylele']	erdOne, jcommelin, mattrobball assignee:jcommelin assignee:erdOne assignee:mattrobball	2-39178 2 days ago	2-38960 2 days ago	23-38018 23 days
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	357/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/IsPullback/CartesianMonoidal.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean	3	34	['FernandoChu', 'dagurtomas', 'edegeltje', 'github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	2-39041 2 days ago	2-39041 2 days ago	11-85241 11 days
36849	mike1729 author:mike1729	feat(Analysis/Normed/Module/SchauderBasis): basic sequences and Grünblum criterium	This PR introduces the theory of basic sequences in Banach spaces, following Albiac–Kalton. Defines basic sequences in normed spaces, and prove the classical Grünblum criterium for recognizing them. New definitions (in BasicSequence.lean) - `BasicSequence`: a bundled ℕ-indexed sequence forming a Schauder basis for its algebraic span, with finite projection bound. - `SatisfiesGrunblumCondition`: partial sums over initial segments are bounded by a constant times the full sum. Main results - `SatisfiesGrunblumCondition.basicSequence`: a nonzero sequence satisfying the Grünblum condition is a basic sequence. - `SatisfiesGrunblumCondition.linearIndependent`: nonzero sequences satisfying that condition are linearly independent. --- - follow up to : #34209 - blocks : #35473 The next planned PRs: - general selection principle for basic sequences - characterization when a set contains a basic sequence in terms of weak closure and compactness - Eberlein–Šmulian theorem - weakly compact subsets of a Banach space are Fréchet–Urysohn spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis new-contributor	253/1	Mathlib.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/Basic.lean,Mathlib/Analysis/Normed/Module/SchauderBasis/BasicSequence.lean	3	2	['github-actions']	sgouezel assignee:sgouezel	2-37669 2 days ago	9-83188 9 days ago	18-32920 18 days
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	2-36858 2 days ago	54-16911 54 days ago	0-1 1 second
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	33/76	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/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	36	5	['gasparattila', 'github-actions', 'themathqueen']	j-loreaux assignee:j-loreaux	2-35611 2 days ago	5-12092 5 days ago	5-15899 5 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	72/3	Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean	1	13	['SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts', 'themathqueen']	nobody	2-35071 2 days ago	5-57693 5 days ago	23-65807 23 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 blocked-by-other-PR	156/6	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean,Mathlib/RingTheory/MvPowerSeries/Rename.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	2-33006 2 days ago	2-85289 2 days ago	0-1732 28 minutes
36399	chrisflav author:chrisflav	feat(RingTheory/Flat): finite flat algebra is trivial if rank is equal to `1`	From Pi1. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	168/3	Mathlib.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RingTheory/Flat/Rank.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	6	11	['chrisflav', 'github-actions', 'riccardobrasca', 'robin-carlier']	alreadydone assignee:alreadydone	2-30547 2 days ago	3-26303 3 days ago	28-12870 28 days
36386	SnkXyx author:SnkXyx	feat(Algebra/MvPolynomial/Degrees): add some lemmas about `degreeOf`	These lemmas are used in #36103 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor delegated label:t-algebra$	86/0	Mathlib/Algebra/MvPolynomial/Degrees.lean	1	19	['Hagb', 'SnkXyx', 'dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'riccardobrasca']	dagurtomas assignee:dagurtomas	2-28250 2 days ago	2-30409 2 days ago	24-61135 24 days
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 - [ ] depends on: #37347 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-meta blocked-by-other-PR	542/428	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.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/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.lean,Mathlib/Tactic/SetNotation.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	24	['JovanGerb', 'b-mehta', 'github-actions', 'j-loreaux', 'joneugster', 'leanprover-radar', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'plp127', 'thorimur']	joneugster assignee:joneugster	2-27614 2 days ago	2-79822 2 days ago	6-56321 6 days
37439	ADedecker author:ADedecker	feat: UniformConvergenceCLM version of ContinuousLinearEquiv.arrowCongr	The absence of simp lemmas comes from the fact that the natural lemmas would break the API boundary. I will try to think about how to make this cleaner. --- - [ ] depends on: #37614 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	137/55	Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	dagurtomas assignee:dagurtomas	2-25348 2 days ago	2-25349 2 days ago	1-24581 1 day
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. This PR generalises #35776 to also unify `Graph`. ### Main definitions * `GraphLike α β Gr`: A typeclass parameterized by a vertex type `α`, dart type `β` and a graph type `Gr` (with `α` as an `outParam`). * `GraphLike.verts : Set α`: The set of vertices of the graph. * `GraphLike.darts : Set β`: The set of darts of the graph. * `GraphLike.Adj : α → α → Prop`: The adjacency relation, defined by default as `Nonempty (darts G u v)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	281/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/GraphLike.lean,Mathlib/Combinatorics/GraphLike/Basic.lean,Mathlib/Combinatorics/SimpleGraph/GraphLike.lean	4	42	['IvanRenison', 'Jun2M', 'SnirBroshi', 'github-actions', 'lauramonk', 'mathlib-merge-conflicts']	nobody	2-23847 2 days ago	15-78555 15 days ago	20-48371 20 days
36901	chrisflav author:chrisflav	chore(CategoryTheory/MorphismProperty): dualise `MorphismProperty.mapOverAdjunction`	From Pi1. --- - [x] depends on: #36900 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory delegated	159/20	Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean	1	7	['dagurtomas', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'riccardobrasca']	joelriou assignee:joelriou	2-22593 2 days ago	2-22594 2 days ago	2-25631 2 days
36357	yuanyi-350 author:yuanyi-350	feat(Analysis/Deriv): add some lemmas for `iteratedDeriv`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	84/9	Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean	5	8	['github-actions', 'j-loreaux', 'sgouezel', 'urkud', 'yuanyi-350']	sgouezel assignee:sgouezel	2-22286 2 days ago	2-22365 2 days ago	10-20748 10 days
26160	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure): add several lemmas which characterize variation	Add the following lemmas concerning variation of a VectorMeasure: * `norm_measure_le_variation`: `‖μ E‖ₑ ≤ variation μ E`. * `variation_neg`: `(-μ).variation = μ.variation`. * `variation_zero`: `(0 : VectorMeasure X V).variation = 0`. * `absolutelyContinuous` Co-authored-by: @yoh-tanimoto - [x] depends on: #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	229/33	Mathlib.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/PreVariation.lean,Mathlib/MeasureTheory/OuterMeasure/Induced.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Basic.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/Order/Partition/Finpartition.lean	10	99	['EtienneC30', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	2-18992 2 days ago	2-18697 2 days ago	40-73397 40 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	553/58	Mathlib.lean,Mathlib/Analysis/Distribution/Distribution.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimensionStrongTopology.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	6	2	['github-actions', 'mathlib-merge-conflicts']	nobody	2-17960 2 days ago	unknown	0-0 0 seconds
37540	quantumsnow author:quantumsnow	feat(CategoryTheory/MorphismProperty/Comma): add MorphismProperty.Arrow	This is needed for the category of topological pairs (#36621). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	104/6	Mathlib/CategoryTheory/MorphismProperty/Comma.lean	1	15	['chrisflav', 'github-actions', 'joelriou', 'quantumsnow']	nobody	2-17786 2 days ago	2-17786 2 days ago	0-7409 2 hours
36638	CoolRmal author:CoolRmal	feat: if `f` lies in a closed convex set `s` almost everywhere, then its conditional expectation also lies in `s` almost everywhere	--- - [x] depends on: #27953 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability maintainer-merge	64/14	Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean	1	10	['CoolRmal', 'EtienneC30', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	EtienneC30 assignee:EtienneC30	2-17088 2 days ago	4-73743 4 days ago	17-9394 17 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	913/49	Mathlib.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/NumberTheory/Transcendental/GelfondSchneider/MainAlg.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Basic.lean	4	16	['github-actions', 'mkaratarakis', 'tb65536']	tb65536 assignee:tb65536	2-16923 2 days ago	2-16978 2 days ago	14-83804 14 days
37606	linesthatinterlace author:linesthatinterlace	feat: Add `Function.prod` and `Function.diag`	This PR adds `Prod.diag`, `Prod.prodMk` and `Sum.get`, canonical spellings of operations that are used in many places but only anonymously. --- - [ ] depends on: #37631 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP blocked-by-other-PR	622/399	Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/FiniteSupport/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Lie/Prod.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Notation/Support.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Ring/Prod.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiffHolder/Pointwise.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/CategoryTheory/Bicategory/Kan/HasKan.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Int/Cast/Prod.lean,Mathlib/Data/Nat/Cast/Prod.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Lattice/Image.lean,Mathlib/Data/Set/NAry.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Tree/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/ContMDiffMap.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Prod.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Init.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/L1Space/Integrable.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/Measure/AEMeasurable.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/EventuallyConst.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/ScottContinuity.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/Kernel/Basic.lean,Mathlib/Probability/Kernel/Composition/MapComap.lean,Mathlib/Probability/Kernel/Composition/MeasureComp.lean,Mathlib/Probability/Kernel/Composition/MeasureCompProd.lean,Mathlib/Probability/Kernel/Composition/Prod.lean,Mathlib/Probability/Kernel/CondDistrib.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean,Mathlib/Topology/Algebra/ProperAction/Basic.lean,Mathlib/Topology/ClopenBox.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/LocallyUniformConvergence.lean,Mathlib/Topology/UniformSpace/Separation.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,MathlibTest/Continuity.lean,MathlibTest/DifferentialGeometry/Notation/Basic.lean,MathlibTest/fun_prop.lean	79	8	['github-actions', 'grunweg', 'linesthatinterlace', 'mathlib-dependent-issues']	nobody	2-16909 2 days ago	2-18427 2 days ago	0-8577 2 hours
37634	grunweg author:grunweg	chore(CI): check all lean scripts build successfully	This would have caught the errors fixed by #37391 much sooner. The list of scripts included in this PR is based on manual inspection of scripts/, and removing any which get run using any PR's CI run anyway. --- - [ ] depends on: #37391 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR CI	28/20	.github/workflows/build_template.yml,scripts/create_deprecated_modules.lean	2	3	['github-actions', 'mathlib-dependent-issues']	nobody	2-16095 2 days ago	2-16145 2 days ago	0-237 3 minutes
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	62/4	Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvarianceTopCat.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean	2	18	['FernandoChu', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou']	dagurtomas assignee:dagurtomas	2-14549 2 days ago	2-14549 2 days ago	4-43116 4 days
37451	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017307958) by @dagurtomas.	t-category-theory delegated	21/0	Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean	1	10	['erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	robin-carlier assignee:robin-carlier	2-14293 2 days ago	2-14521 2 days ago	3-82227 3 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	148/0	Mathlib.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Fib/Lame.lean,docs/1000.yaml	5	20	['github-actions', 'kennethgoodman', 'vihdzp']	nobody	2-13335 2 days ago	2-64048 2 days ago	2-69872 2 days
28291	vasnesterov author:vasnesterov	feat(Tactic): tactic for computing asymptotics of real functions	It's an auxiliary PR which 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: #37418 - [ ] depends on: #37419 - [ ] depends on: #37414 - [ ] depends on: #37411 - [ ] depends on: #37415 - [ ] depends on: #37342 - [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	12168/73	Mathlib.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Normed/Operator/Basic.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/Monomial/Predicates.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	19	['github-actions', 'grunweg', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'ocfnash', 'vasnesterov']	nobody	2-12780 2 days ago	237-25603 237 days ago	0-54 54 seconds
37636	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Copy): a graph is inducingly contained in another iff it's equivalent to an induced graph	This is a version of `isIndContained_iff_exists_iso_subgraph` using `SimpleGraph.induce` instead of `Subgraph.IsInduced`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	8/0	Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	1	['github-actions']	nobody	2-11650 2 days ago	2-11689 2 days ago	2-11763 2 days
34298	CoolRmal author:CoolRmal	feat(MeasureTheory): Integral over Ioi tends to zero	This PR proves that if `f` is integrable on `Ioi a`, then `∫ x in Ioi (b i), f x ∂μ` tends to zero as `b i` tends to infinity. This is an easy corollary of `intervalIntegral_tendsto_integral_Ioi`. --- - [x] depends on #34197 - [x] depends on #34289 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	83/1	Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	2	20	['CoolRmal', 'EtienneC30', 'github-actions', 'mcdoll']	EtienneC30 assignee:EtienneC30	2-9108 2 days ago	2-9108 2 days ago	50-44929 50 days
36462	wwylele author:wwylele	feat(Geometry/Euclidean): integration formula for μHE	A step towards #34826. --- The location of `MeasureTheory.volume_eq_of_finrank_eq_one` feels a bit random. I'd like to put it in some early files, but it uses measure preserving of isometry in Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean, which is why it ended up there [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-euclidean-geometry	137/5	Mathlib/Geometry/Euclidean/Volume/Measure.lean,Mathlib/MeasureTheory/MeasurableSpace/Embedding.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean	3	44	['EtienneC30', 'copilot-pull-request-reviewer', 'eric-wieser', 'github-actions', 'wwylele']	EtienneC30 assignee:EtienneC30	2-9064 2 days ago	2-9064 2 days ago	26-72923 26 days
37347	JovanGerb author:JovanGerb	feat: implementation of `@[use_set_notation]`	This PR is the implementation part of #32983, without using the feature yet. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	261/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SetNotation.lean,MathlibTest/Delab/Subset.lean	4	18	['JovanGerb', 'github-actions', 'thorimur']	alexjbest and thorimur assignee:alexjbest assignee:thorimur	2-6674 2 days ago	7-75434 7 days ago	7-75424 7 days
37640	IvanRenison author:IvanRenison	feat(Order/RelIso): add lemmas about congruence with `relIso`	--- In #37598 I realized this is missing [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	26/0	Mathlib/Order/RelIso/Basic.lean	1	1	['github-actions']	nobody	2-6395 2 days ago	2-6686 2 days ago	2-6676 2 days
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	35/12	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean	2	16	['IvanRenison', 'SnirBroshi', 'b-mehta', 'github-actions', 'mathlib-bors']	b-mehta assignee:b-mehta	2-6347 2 days ago	3-18083 3 days ago	3-18394 3 days
36775	ADedecker author:ADedecker	feat: if `E` is finite dimensional, `E →L[𝕜] F` has the product topology	--- - [x] depends on: #36776 - [x] depends on: #36870 - [ ] depends on: #37435 - [ ] depends on: #37439 - [ ] depends on: #37614 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP blocked-by-other-PR	437/55	Mathlib.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimensionStrongTopology.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	5	7	['ADedecker', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	2-3556 2 days ago	7-20643 7 days ago	9-41060 9 days
36833	harahu author:harahu	doc: demote repeated H1 headers	Having more than one H1 header per file confuses search engines and thus makes documentation more difficult to find. Hence, we make sure that lean files only have a single H1 header in them. In the case of `Mathlib/Tactic/Common.lean`, we achieve this by adding a new module header. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	12/10	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	9	2	['github-actions', 'harahu', 'vihdzp']	nobody	2-3421 2 days ago	2-3477 2 days ago	2-3871 2 days
37321	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): anodyne extensions	--- - [ ] depends on: #28462 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP blocked-by-other-PR merge-conflict	1284/7	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RelativeCellComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/CategoryWithFibrations.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/NonDegenerateSimplicesSubcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/SubcomplexEvaluation.lean,Mathlib/CategoryTheory/Limits/Types/Coproducts.lean,Mathlib/CategoryTheory/MorphismProperty/IsSmall.lean,Mathlib/CategoryTheory/MorphismProperty/LiftingProperty.lean,Mathlib/CategoryTheory/SmallObject/IsCardinalForSmallObjectArgument.lean,Mathlib/CategoryTheory/SmallObject/TransfiniteCompositionLifting.lean,Mathlib/CategoryTheory/Subfunctor/Basic.lean,Mathlib/Data/Finset/BooleanAlgebra.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/SetTheory/Ordinal/Basic.lean	23	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-1405 2 days ago	9-844 9 days ago	0-256 4 minutes
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	1-86162 1 day ago	unknown	0-0 0 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	61/50	Mathlib/Combinatorics/SimpleGraph/Coloring/VertexColoring.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/IncMatrix.lean,Mathlib/Combinatorics/SimpleGraph/LineGraph.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	1-85909 1 day ago	1-85967 1 day ago	2-44 2 days
35707	BryceT233 author:BryceT233	feat(RingTheory/MvPowerSeries): introduce `truncTotal`	This PR introduces the total degree truncation of multivariate formal power series when the index is finite, and uses it to establish the algebraic equivalence between `MvPowerSeries` and the adic completion of `MvPolynomial` with respect to the ideal spanned by all variables `idealOfVars`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory awaiting-author	207/1	Mathlib.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean	4	18	['BryceT233', 'WilliamCoram', 'github-actions', 'jcommelin', 'joneugster', 'mathlib-bors', 'wwylele']	erdOne, jcommelin, riccardobrasca assignee:jcommelin assignee:riccardobrasca assignee:erdOne	1-76907 1 day ago	2-46169 2 days ago	39-242 39 days
37597	pitmonticone author:pitmonticone	feat(Analysis/SumIntegralComparisons): add sum-integral estimates for `x^k * exp(-cx)`	Add bounds for sums and integrals of `x^k * exp(-cx)`: - `intervalIntegral_pow_mul_exp_neg_le` - `sum_Ico_pow_mul_exp_neg_le` - `sum_Iic_pow_mul_exp_neg_le` - `sum_Iic_pow_mul_two_pow_neg_le` Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Sébastien Gouëzel ---	carleson t-analysis large-import	65/0	Mathlib/Analysis/SumIntegralComparisons.lean	1	3	['b-mehta', 'github-actions', 'pitmonticone']	nobody	1-76613 1 day ago	1-76614 1 day ago	3-22785 3 days
37547	pitmonticone author:pitmonticone	feat(MeasureTheory/LpSeminorm): add `rpow_add_le_mul_rpow_add_rpow'` variants	Add two variants of `ENNReal.rpow_add_le_mul_rpow_add_rpow` using `LpAddConst` as the constant, valid for all `0 ≤ p` (not just `1 ≤ p`). Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Leo Diedering <129694072+ldiedering@users.noreply.github.com> ---	carleson easy t-measure-probability	36/0	Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean	1	1	['github-actions']	kex-y assignee:kex-y	1-76576 1 day ago	4-19277 4 days ago	4-19267 4 days
37551	pitmonticone author:pitmonticone	feat(MeasureTheory/Integral/Average): add `laverage_mono_ae` and `setLAverage_le_essSup`	Add monotonicity and essential supremum bounds for the Lebesgue average: - `laverage_mono_ae` - `setLAverage_mono_ae` (tagged `@[gcongr]`) - `setLAverage_le_essSup` - `laverage_le_essSup` Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: James Sundstrom ---	carleson t-measure-probability	25/0	Mathlib/MeasureTheory/Integral/Average.lean	1	4	['EtienneC30', 'github-actions', 'pitmonticone']	EtienneC30 assignee:EtienneC30	1-76567 1 day ago	1-80840 1 day ago	3-74082 3 days
37559	pitmonticone author:pitmonticone	feat(MeasureTheory/LpSeminorm): add `HasCompactSupport.memLp_of_enorm_bound`	Add `HasCompactSupport.memLp_of_enorm_bound`: a bounded measurable function with compact support is in L^p. This is the `ENNReal`-valued version of `HasCompactSupport.memLp_of_bound`. Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Floris van Doorn ---	carleson easy t-measure-probability	19/0	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean	1	1	['github-actions']	RemyDegenne assignee:RemyDegenne	1-76559 1 day ago	4-8898 4 days ago	4-8888 4 days
37552	pitmonticone author:pitmonticone	feat(MeasureTheory/BorelSpace): add `measurable_iSup_of_lowerSemicontinuous`	Add `measurable_biSup_of_continuousOn`: the supremum of a family of measurable functions parameterized by a separable pseudometric space is measurable, provided the family is continuous on the parameter set. Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Jeremy Tan Jie Rui ---	carleson t-measure-probability	25/0	Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean	1	9	['CoolRmal', 'github-actions', 'grunweg', 'pitmonticone']	kex-y assignee:kex-y	1-76556 1 day ago	3-29495 3 days ago	4-11842 4 days
37565	pitmonticone author:pitmonticone	feat(Data/ENNReal): add `ofReal_inv_le` and `ofReal_div_le`	Add inequality versions of `ofReal_inv_of_pos` and `ofReal_div_of_pos` that don't require positivity: - `ofReal_inv_le`: `ENNReal.ofReal x⁻¹ ≤ (ENNReal.ofReal x)⁻¹` - `ofReal_div_le`: `ENNReal.ofReal (x / y) ≤ ENNReal.ofReal x / ENNReal.ofReal y` Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Jeremy Tan Jie Rui ---	carleson t-data easy	11/0	Mathlib/Data/ENNReal/Inv.lean	1	1	['github-actions']	nobody	1-76548 1 day ago	4-5471 4 days ago	4-5461 4 days
34773	semaraugusto author:semaraugusto	feat(InformationTheory): add Shannon entropy for probability mass functions	Add Shannon entropy for probability mass functions This PR defines the Shannon entropy of a probability mass function as an ℝ-valued infinite sum using `Real.negMulLog`, and proves basic properties and standard computations. Main results include: * entropy is nonnegative; * entropy vanishes iff the PMF is deterministic (`PMF.pure`); * entropy is strictly positive for non-pure PMFs; * entropy of a Bernoulli PMF coincides with `Real.binEntropy`; * entropy of uniform distributions is `log` of the cardinality, both for `PMF.uniformOfFintype` and `PMF.uniformOfFinset`. Several small helper lemmas isolate technical arguments about supports, coercions from `ℝ≥0∞`, and bounds on infinite sums, in order to keep the main proofs readable. See the [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/generic.20shannon.20entropy.20formalization.20mathlib4/with/570643335). --- I used ChatGPT for some proof structuring and refactoring suggestions, but all proofs were manually checked and adapted. I verified the arguments and adjusted naming and structure to follow mathlib conventions. The proof of shannonEntropy_eq_log_card_sub_toReal_klDiv_uniformOfFintype and some of its helper lemmas were initially generated using Codex. I manually reviewed the generated proof, checked each step, and refactored the code and naming to follow mathlib conventions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor LLM-generated	417/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/InformationTheory/Entropy.lean	3	14	['adomasbaliuka', 'dupuisf', 'github-actions', 'mathlib-merge-conflicts', 'mattrobball', 'semaraugusto', 'wwylele']	dupuisf and sgouezel assignee:sgouezel assignee:dupuisf	1-75424 1 day ago	1-75424 1 day ago	11-7118 11 days
36660	zw810-ctrl author:zw810-ctrl	feat(Topology/Maps): add Bourbaki strict maps	For #36269. add a lemma lemma IsQuotientMap.isOpenMap_of_injective {f : X → Y} (hq : IsQuotientMap f) (hinj : Function.Injective f) : IsOpenMap f which may be put at Mathlib.Topology.Maps.Basic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor awaiting-author	97/0	Mathlib.lean,Mathlib/Topology/Maps/Strict/Basic.lean	2	31	['ADedecker', 'github-actions', 'plp127', 'zw810-ctrl']	nobody	1-74588 1 day ago	22-60001 22 days ago	0-683 11 minutes
37612	dupuisf author:dupuisf	feat(ContinuousFunctionalCalculus): add integral representation for `x ↦ x ^ p` for `p ∈ (1, 2)`	This PR adds an integral representation for the function `x ↦ x ^ p` for `p ∈ (1, 2)`. We already have an analogous representation for `p ∈ (0, 1)`. This will later be used to show that this function is operator convex in that range. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	155/6	Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean	1	3	['github-actions', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	1-72015 1 day ago	1-72036 1 day ago	2-85919 2 days
33443	sahanwijetunga author:sahanwijetunga	feat: Define Isometries of Bilinear Spaces	--- We define Isometries of Bilinear Spaces, closely following the implementation of isometries of quadratic spaces. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	277/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Isometry.lean,Mathlib/LinearAlgebra/BilinearForm/IsometryEquiv.lean	3	20	['github-actions', 'robin-carlier', 'sahanwijetunga']	mattrobball assignee:mattrobball	1-71844 1 day ago	1-71882 1 day ago	44-74260 44 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	6	['Maldooor', 'github-actions']	nobody	1-69926 1 day ago	42-79588 42 days ago	49-26466 49 days
36329	rwst author:rwst	feat(PowerSeries): add barebones Log.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	67/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Log.lean	2	1	['github-actions']	riccardobrasca assignee:riccardobrasca	1-69925 1 day ago	30-5920 30 days ago	30-5910 30 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$	574/0	Mathlib.lean,Mathlib/LinearAlgebra/Center.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean,Mathlib/LinearAlgebra/Transvection/Generation.lean	6	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	1-69638 1 day ago	10-42749 10 days ago	10-54157 10 days
33842	joelriou author:joelriou	feat(Algebra/Homology): spectral sequences	This PR concludes a series of 44 PRs which contains two mostly independent developments: 1. The construction of the spectral object attached to objects in a triangulated category `C` equipped with a t-structure; 2. The definition of a category of spectral sequences and the construction of the spectral sequence attached to a spectral object indexed by the extended integers (the integers with +/- infinity) in an abelian category, and this very PR adds the computation of the first page of the spectral sequence. We now have two ways to construct a spectral object in triangulated categories (the spectral object attached to a filtered complex, and the spectral object attached to a t-structure 1.). After applying a homological functor to these spectral objects, we obtain a spectral object in an abelian category, and the construction 2. allows to define spectral sequences. When more results are obtained about derived functors, the hypercohomology spectral sequence and the Grothendieck spectral sequence of composition of derived functors shall follow. The study of the stabilization and convergence of spectral sequences is not yet included (even though all the necessary code appears in #25848). The mathematical material is discussed in https://hal.science/hal-04546712v5 (§5.4.1 and §5.4.4). --- Dependency graph: https://jriou.org/tmp/spectral-sequences.pdf 1. The construction of the spectral object attached to objects in a triangulated category `C` equipped with a t-structure; - [x] depends on: #35370 - [x] depends on: #35369 - [x] depends on: #35368 - [x] depends on: #35367 - [x] depends on: #35364 - [x] depends on: #35363 - [x] depends on: #35362 2. The definition of a category of spectral sequences and the construction of the spectral sequence attached to a spectral object indexed by the extended integers (the integers with +/- infinity) in an abelian category. - [x] depends on: #36555 - [x] depends on: #36550 - [x] depends on: #36182 - [x] depends on: #36153 - [x] depends on: #36032 - [x] depends on: #36030 - [x] depends on: #36029 - [x] depends on: #35378 - [x] depends on: #35361 - [x] depends on: #35359 - [x] depends on: #35356 - [x] depends on: #35375 - [x] depends on: #35374 - [x] depends on: #35355 - [x] depends on: #35372 - [x] depends on: #35357 3. Prerequisites: - [x] depends on: #34372 - [x] depends on: #34368 - [x] depends on: #34366 - [x] depends on: #34359 - [x] depends on: #33875 - [x] depends on: #33876 - [x] depends on: #34373 - [x] depends on: #34358 - [x] depends on: #33874 - [x] depends on: #33877 - [x] depends on: #33879 - [x] depends on: #33880 - [x] depends on: #33881 - [x] depends on: #33437 - [x] depends on: #33883 - [x] depends on: #33886 - [x] depends on: #33887 - [x] depends on: #33888 - [x] depends on: #33890 - [x] depends on: #35373 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	144/4	Mathlib.lean,Mathlib/Algebra/Homology/SpectralObject/Differentials.lean,Mathlib/Algebra/Homology/SpectralObject/FirstPage.lean,Mathlib/Algebra/Homology/SpectralObject/HasSpectralSequence.lean,Mathlib/Algebra/Homology/SpectralObject/SpectralSequence.lean,Mathlib/CategoryTheory/Triangulated/TStructure/TruncLTGE.lean	6	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	robin-carlier assignee:robin-carlier	1-69637 1 day ago	2-20123 2 days ago	2-20114 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	315/9	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	urkud assignee:urkud	1-69635 1 day ago	3-84872 3 days ago	3-85146 3 days
37319	PrParadoxy author:PrParadoxy	feat(Algebra/Field/Power): weaken assumptions of Odd.neg_zpow	The lemmas `Even.neg_zpow` and `Even.neg_one_zpow` are stated assuming `[DivisionMonoid α] [HasDistribNeg α]`. However, `Odd.neg_zpow` and `Odd.neg_one_zpow` currently assume the stronger `[DivisionRing α]`. This PR weakens the assumption of the `Odd` lemmas to match their `Even` counterparts. --- According to the docstring, the purpose of `Mathlib.Algebra.Field.Power` is to define `Field` with minimal imports. But after this PR, Power.lean does not rely on `Mathlib.Algebra.Field.Defs` any more. Arguably, it could be deprecated. The two results in the file could be stated in `Mathlib.Algebra.Ring.Int.Parity` without any extra imports. Should we implement this in the current or an additional PR? Examples: ``` -- these all work: example (z : ℤ) (h : Even z) : (-1 : ℂ)^z = 1 := Even.neg_one_zpow h example (z : ℤ) (h : Even z) : (-1 : unitary ℂ)^z = 1 := Even.neg_one_zpow h example (z : ℤ) (h : Odd z) : (-1 : ℂ)^z = -1 := Odd.neg_one_zpow h -- but this fails without the PR: example (z : ℤ) (h : Odd z) : (-1 : unitary ℂ)^z = -1 := Odd.neg_one_zpow h ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	16/10	Mathlib/Algebra/Field/Power.lean,Mathlib/Tactic/FieldSimp/Lemmas.lean	2	6	['eric-wieser', 'github-actions', 'goliath-klein']	dagurtomas assignee:dagurtomas	1-69632 1 day ago	9-6575 9 days ago	9-9364 9 days
37333	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): more API for horns	--- - [x] depends on: #37332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	90/0	Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean	1	2	['github-actions', 'mathlib-dependent-issues']	robin-carlier assignee:robin-carlier	1-69631 1 day ago	2-1806 2 days ago	2-5891 2 days
37393	SnirBroshi author:SnirBroshi	refactor(Algebra/Order/Monoid/Unbundled/Defs): upgrade `*ReflectLE` from `abbrev`s to `class`es	... to mitigate performance regression caused by #36629. Currently these classes are an `abbrev` for `ContravariantClass` so when TC-search tries to synthesize them it ends up looking through all the `ContravariantClass` instances and not just the relevant ones. --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/116290-rss/topic/Significant.20commits.20to.20mathlib4/near/582661644) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	60/56	Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.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/SetTheory/Ordinal/Arithmetic.lean	7	8	['JovanGerb', 'SnirBroshi', 'github-actions', 'leanprover-radar', 'vihdzp']	dagurtomas assignee:dagurtomas	1-69630 1 day ago	3-50147 3 days ago	6-50357 6 days
37412	LLaurance author:LLaurance	chore(Analysis): shorten proofs by removing steps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	7/18	Mathlib/Analysis/Calculus/FDeriv/Add.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/ODE/PicardLindelof.lean	4	7	['LLaurance', 'github-actions', 'j-loreaux', 'themathqueen']	j-loreaux assignee:j-loreaux	1-69628 1 day ago	3-63368 3 days ago	4-30057 4 days
37418	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): introduce `Multiseries.Sorted`	* Introduce `Multiseries.leadingExp` - the leading exponent of a multiseries, along with a few structural lemmas. * Introduce `Multiseries.Sorted` predicate stating that exponents in a multiseries as a list are strictly decreasing. * Provide constructors (`nil`, `cons`), a coinductive principle, and basic constructions for `Sorted`. --- 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	208/0	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Defs.lean	1	1	['github-actions']	adamtopaz assignee:adamtopaz	1-69627 1 day ago	6-42567 6 days ago	6-42557 6 days
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 label:t-algebra$	27/0	Mathlib/Algebra/BigOperators/NatAntidiagonal.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	1-69627 1 day ago	6-29279 6 days ago	6-29269 6 days
37437	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$	307/19	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	1-69626 1 day ago	6-27288 6 days ago	6-27278 6 days
37438	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	602/22	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	1-69625 1 day ago	6-26698 6 days ago	6-26688 6 days
37607	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): connected components of simplicial sets	--- - [x] depends on: #37334 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	182/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nonempty.lean,Mathlib/AlgebraicTopology/SimplicialSet/PiZero.lean	4	2	['github-actions', 'mathlib-dependent-issues']	robin-carlier assignee:robin-carlier	1-69623 1 day ago	2-13288 2 days ago	2-13537 2 days
37645	joelriou author:joelriou	feat(CategoryTheory/Limits): `sigmaConst` preserves colimits	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	64/37	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/CategoryTheory/Limits/Preserves/SigmaConst.lean	3	1	['github-actions']	robin-carlier assignee:robin-carlier	1-69622 1 day ago	1-82403 1 day ago	1-83256 1 day
36104	LarsenClose author:LarsenClose	feat(CategoryTheory/Endofunctor/Algebra): add Adámek's initial algebra theorem	Adds Adámek's initial algebra theorem for endofunctors on categories with an initial object. Given `F : C ⥤ C` where `C` has an initial object, if the initial chain `⊥ → F(⊥) → F²(⊥) → ⋯` has a colimit preserved by `F`, then `F` has an initial algebra whose structure map is an isomorphism. New files: - `InitialChain.lean`: defines `iterateObj F n`, `iterateMap F n`, and `initialChain F : ℕ ⥤ C` via `Functor.ofSequence`. - `ChainShift.lean`: constructs `shiftCocone` and `extendCocone`, proves `shiftCoconeIsColimit` (shifted cocone inherits colimit). - `Adamek.lean`: main result. Constructs the initial `F`-algebra `adamek F c hc` and proves `adamek_isInitial`. Convenience API: `adamekFromInitial`, `adamekStructureIso`, `adamekFixedPoint`. 0 sorry. References Adámek 1974. ### AI disclosure Developed with assistance from Claude (Anthropic). AI was used for proof exploration, convention checking, and PR preparation. All mathematical content and proof strategy reviewed and understood by the author.	t-category-theory new-contributor awaiting-author	513/0	Mathlib.lean,Mathlib/CategoryTheory/Endofunctor/Algebra/Adamek.lean,Mathlib/CategoryTheory/Endofunctor/Algebra/ChainShift.lean,Mathlib/CategoryTheory/Endofunctor/Algebra/InitialChain.lean,docs/references.bib	5	7	['LarsenClose', 'dagurtomas', 'github-actions', 'joelriou']	joelriou assignee:joelriou	1-67018 1 day ago	20-45599 20 days ago	12-9994 12 days
36758	LarsenClose author:LarsenClose	feat(Algebra/Category/ModuleCat): add locally finitely presentable instance	Prove that `ModuleCat R` is locally finitely presentable for any commutative ring `R`. The free rank-1 module is a small strong generator of `ℵ₀`-presentable objects (Gabriel-Ulmer, Adamek-Rosicky Theorem 1.11). This is the first `IsLocallyFinitelyPresentable` instance for an algebraic category in Mathlib. Opens the path to LFP instances for other algebraic categories (groups, rings, etc.) via the same generator pattern. Companion to #36104. ### AI disclosure Developed with assistance from Claude (Anthropic). AI was used for proof exploration, convention checking, and PR preparation. All mathematical content and proof strategy reviewed and understood by the author.	new-contributor t-algebra awaiting-author label:t-algebra$	124/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presentable.lean	2	11	['LarsenClose', 'eric-wieser', 'github-actions', 'joelriou']	nobody	1-67017 1 day ago	20-44793 20 days ago	0-17245 4 hours
36856	harahu author:harahu	doc(Geometry): tidy bibliography entry	Use canonical author names and rename the bib key to match the corrected ASCII transcription of Domínguez. Sources: https://fama.iff.csic.es/personas/margalef/margalef.html ; https://produccioncientifica.ucm.es/investigadores/166066/tesis Normalize the title and move the translation information into a note phrased as 'Translated from the Spanish original'. Sources: https://books.google.com/books/about/Differential_Topology.html?id=gexAr04vRT4C ; https://books.google.com/books/about/Topolog%C3%ADa_diferencial.html?id=0PRMy3ffm4QC Use the conventional publisher form 'North-Holland Publishing Co., Amsterdam' instead of the imported catalog-style field. Sources: https://search.worldcat.org/title/Differential-topology/oclc/25713102 ; https://www.ams.org/tran/2010-362-08/S0002-9947-10-05073-7/ Prepared with assistance from Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry LLM-generated	8/7	Mathlib/Geometry/Manifold/Immersion.lean,docs/references.bib	2	4	['github-actions', 'grunweg', 'harahu']	PatrickMassot assignee:PatrickMassot	1-64984 1 day ago	17-85878 17 days ago	18-10689 18 days
37580	ldct author:ldct	chore: list hints in order of priority	List hints in order of priority so it's easier to tell what order `hint` tries them in. In a dependent PR I intend to add a tactic to this list. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	8/8	Mathlib/Tactic/Common.lean	1	3	['github-actions', 'grunweg', 'ldct']	nobody	1-64971 1 day ago	3-65954 3 days ago	0-3164 52 minutes
37646	SnirBroshi author:SnirBroshi	feat(Logic): surjective embeddings are equivs	Upgrade `Equiv.ofBijective` / `Embedding.equivOfSurjective` / `RelIso.ofSurjective` to equivalences. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	27/1	Mathlib/Logic/Embedding/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/RelIso/Basic.lean	3	1	['github-actions']	nobody	1-59318 1 day ago	1-79004 1 day ago	1-78994 1 day
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 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	6	['Komyyy', 'github-actions', 'leanprover-radar', 'mathlib-bors']	nobody	1-58530 1 day ago	5-46863 5 days ago	0-240 4 minutes
37628	JadAbouHawili author:JadAbouHawili	chore: Rename Xor' to Xor	Rename `Xor'` to `Xor` per the comment which recommended doing so after `v4.25.0-rc1` Moves: - Xor' --> Xor --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	75/66	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/GroupTheory/Index.lean,Mathlib/Logic/Basic.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean,Mathlib/Order/SymmDiff.lean,Mathlib/Tactic/ITauto.lean,Mathlib/Topology/Algebra/Order/Archimedean.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Instances/AddCircle/DenseSubgroup.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Profinite.lean,MathlibTest/itauto.lean	18	19	['JadAbouHawili', 'Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'grunweg']	nobody	1-52497 1 day ago	1-85415 1 day ago	2-19560 2 days
35906	scp020 author:scp020	feat(Combinatorics/SimpleGraph/Walk): chords of walks	Define `Walk.IsChord` and `Walk.IsChordless` predicates in a new file `SimpleGraph/Walks/Chord.lean`. See "chord" in https://en.wikipedia.org/wiki/Glossary_of_graph_theory --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Walk.2EIsChordless.20live.20in.20mathlib.3F/with/575277309) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor maintainer-merge	59/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Chord.lean	2	68	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'scp020']	YaelDillies assignee:YaelDillies	1-50621 1 day ago	1-67758 1 day ago	26-57613 26 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	75/6	Mathlib/Probability/Distributions/Poisson/Basic.lean	1	38	['CoolRmal', 'DavidLedvinka', 'EtienneC30', 'github-actions', 'huaizhangchu', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	EtienneC30 assignee:EtienneC30	1-46798 1 day ago	1-46858 1 day ago	39-1652 39 days
36606	harahu author:harahu	chore(AlgebraicGeometry): fix markdown list indentation	We replace lazy continuation lines in lists with either: - indented lines, to signify that the line is indeed a continuation line; or - a newline, where the continuation line(s) were in fact intended to be disconnected from the list. We do this because lazy continuation is a markdown footgun that one does well to avoid. We also standardize indentation such that continuation lines now line up with the first line of the item they're continuing. This seems to be the solution enforced by markdown formatters, e.g. `mdformat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	19/17	Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Flat.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/Properties.lean	5	11	['chrisflav', 'dagurtomas', 'github-actions', 'grunweg', 'harahu']	alexjbest and dagurtomas assignee:alexjbest assignee:dagurtomas	1-45047 1 day ago	4-59222 4 days ago	19-32663 19 days
37452	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/Condensed/Light/Epi.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017308832) by @dagurtomas.	t-condensed delegated	19/0	Mathlib/Condensed/Light/Epi.lean	1	3	['github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1-44647 1 day ago	1-44647 1 day ago	4-52097 4 days
37621	vasnesterov author:vasnesterov	feat(Analysis/Asymptotics): if `u` is eventually positive and `u ~ v` then `v` is eventually positive	Prove that `Asymptotics.IsEquivalent` respects (non)positivity and (non)negativity of functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	32/0	Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean	1	4	['github-actions', 'vasnesterov', 'vihdzp']	nobody	1-44198 1 day ago	1-44251 1 day ago	2-81332 2 days
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	46/24	Mathlib/Topology/FiberBundle/Trivialization.lean	1	4	['chenson2018', 'github-actions', 'grunweg']	urkud assignee:urkud	1-43078 1 day ago	1-43169 1 day ago	2-73668 2 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 merge-conflict	886/512	Mathlib/Algebra/Homology/SpectralSequence/ComplexShape.lean,Mathlib/Algebra/Lie/Prod.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/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/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/ChosenPullback.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits/Basic.lean,Mathlib/CategoryTheory/NatIso.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/Fin/Basic.lean,Mathlib/Data/Fin/FlagRange.lean,Mathlib/Data/Finset/Density.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Multiset/DershowitzManna.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/FieldTheory/CardinalEmb.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/Extension.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/GroupTheory/Descent.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/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Order/UpperLower.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/NumberTheory/ModularForms/Discriminant.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Transform.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Inertia.lean,Mathlib/NumberTheory/RamificationInertia/Ramification.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/Circular.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Filter/Defs.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/Zorn.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/Kernel/Category/SFinKer.lean,Mathlib/Probability/Kernel/Category/Stoch.lean,Mathlib/Probability/Notation.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/Probability/StrongLaw.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/Algebraize.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/CategoryTheory/CancelIso.lean,Mathlib/Tactic/CategoryTheory/Coherence/Normalize.lean,Mathlib/Tactic/CategoryTheory/Coherence/PureCoherence.lean	127	12	['github-actions', 'harahu', 'mathlib-merge-conflicts']	nobody	1-42776 1 day ago	unknown	0-0 0 seconds
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	1-42653 1 day ago	18-14064 18 days ago	15-18023 15 days
26645	erdOne author:erdOne	feat(RingTheory/PowerSeries): Construction of `Q` such that `P(Q(X)) = X`	Co-authored-by: Junnosuke Koizumi Co-authored-by: Hyeon, Seung-Hyeon Co-authored-by: Yuichiro Taguchi This contribution was created as part of the ZMC conference 2025 "Anabelian Geometry and its Computer Formalization". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	130/0	Mathlib/RingTheory/PowerSeries/Substitution.lean	1	10	['chrisflav', 'erdOne', 'github-actions', 'kckennylau', 'riccardobrasca']	alreadydone, chrisflav, kbuzzard, riccardobrasca assignee:alreadydone assignee:kbuzzard assignee:riccardobrasca assignee:chrisflav	1-42425 1 day ago	5-45410 5 days ago	53-75260 53 days
37463	hommmmm author:hommmmm	style(RingTheory/Ideal/KrullsHeightTheorem): capitalization convention for minimalPrimes	Fixed capitalization convention for `minimal_prime` to lower camel case `minimalPrime` according to mathlib naming conventions. There are 8 changed occurrences in `RingTheory/Ideal/KrullsHeightTheorem` and 2 in `RingTheory/Ideal/MinimalPrime/Localization`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-ring-theory	14/10	Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean	2	12	['Multramate', 'github-actions', 'hommmmm', 'themathqueen']	nobody	1-41685 1 day ago	2-1698 2 days ago	5-41247 5 days
37630	joelriou author:joelriou	feat(AlgebraicTopology): homology in degree 0	In this PR, we compute the singular homology of a topological space in degree `0` in terms of its path connected components. This follows from a similar result for the homology of simplicial sets. This is a rough draft. --- - [ ] depends on: #37656 - [ ] depends on: #37645 - [ ] depends on: #37607 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP blocked-by-other-PR	625/37	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Free.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nonempty.lean,Mathlib/AlgebraicTopology/SimplicialSet/PiZero.lean,Mathlib/AlgebraicTopology/SimplicialSet/TopAdj.lean,Mathlib/AlgebraicTopology/SingularHomology/HomologyZero.lean,Mathlib/CategoryTheory/Limits/Preserves/SigmaConst.lean	8	2	['github-actions', 'mathlib-dependent-issues']	nobody	1-40295 1 day ago	2-21908 2 days ago	0-1 1 second
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	1-39172 1 day ago	unknown	0-0 0 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	41/62	Mathlib/Topology/Order/LowerUpperTopology.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	1-38405 1 day ago	unknown	0-0 0 seconds
37658	joelriou author:joelriou	chore(AlgebraicTopology): rename `SingularHomology.HomotopyInvarianceTopCat`	Following #37656, it is possible to rename `SingularHomology.HomotopyInvarianceTopCat` as `SingularHomology.HomotopyInvariance`. --- - [ ] depends on: #37656 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP file-removed blocked-by-other-PR	321/181	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/HomotopyInvariance.lean,Mathlib/AlgebraicTopology/SingularHomology/Basic.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvariance.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvarianceTopCat.lean	6	3	['github-actions', 'mathlib-dependent-issues']	nobody	1-38150 1 day ago	1-39349 1 day ago	0-1 1 second
36676	euprunin author:euprunin	chore: replace long terminal `simp only […]`:s (≥3 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): * `Polynomial.map_comp`: unchanged 🎉 * `AlgebraicGeometry.IsClosedImmersion.Spec_iff`: 152 ms before, 107 ms after 🎉 * `nnnorm_pow_le`: unchanged 🎉 * `norm_pow_le`: unchanged 🎉 * `integral_sin`: unchanged 🎉 * `SimpleGraph.Subgraph.le_induce_union`: unchanged 🎉 * `ENNReal.iSup_add_iSup`: unchanged 🎉 * `ENat.iSup_add_iSup`: unchanged 🎉 * `ENat.mul_epow`: unchanged 🎉 * `EReal.abs_eq_zero_iff`: unchanged 🎉 * `Finset.disjoint_biUnion_left`: unchanged 🎉 * `List.splitOnP.go_acc`: unchanged 🎉 * `Multiset.count_map_eq_count`: unchanged 🎉 * `Nat.toDigitsCore_length`: unchanged 🎉 * `PartENat.pos_iff_one_le`: unchanged 🎉 * `Rat.intCast_div_self`: unchanged 🎉 * `Set.biUnion_empty_finset`: unchanged 🎉 * `Quot.subsingleton_iff`: unchanged 🎉 * `Equiv.Perm.support_closure_subset_union`: unchanged 🎉 * `Module.Basis.reindexRange_repr'`: unchanged 🎉 * `MeasureTheory.mul_le_addHaar_image_of_lt_det`: unchanged 🎉 * `MeasureTheory.memLp_finset_sum`: unchanged 🎉 * `MeasureTheory.exists_lt_lowerSemicontinuous_integral_lt`: 450 ms before, 404 ms after 🎉 * `BoundedContinuousFunction.toReal_lintegral_coe_eq_integral`: unchanged 🎉 * `nullMeasurableSet_region_between_oc`: unchanged 🎉 * `nullMeasurableSet_region_between_co`: unchanged 🎉 * `nullMeasurableSet_region_between_cc`: unchanged 🎉 * `MeasureTheory.integral_le_liminf_integral_of_forall_isOpen_measure_le_liminf_measure`: unchanged 🎉 * `padicValNat.pow_add_pow`: unchanged 🎉 * `Monotone.biUnion_Ico_Ioc_map_succ`: unchanged 🎉 * `ProbabilityTheory.condIndepSets_singleton_iff`: unchanged 🎉 * `ProbabilityTheory.sum_variance_truncation_le`: unchanged 🎉 * `IsLocalRing.CotangentSpace.span_image_eq_top_iff`: unchanged 🎉 * `galRestrict'_galLift`: 163 ms before, 48 ms after 🎉 * `Valuation.ne_zero_of_isUnit`: unchanged 🎉 * `hasProd_prod`: 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/)		35/35	Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/ENat/Lattice.lean,Mathlib/Data/ENat/Pow.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finset/Union.lean,Mathlib/Data/Multiset/Filter.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Set/Constructions.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/Order/SuccPred/IntervalSucc.lean,Mathlib/Probability/Independence/Conditional.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/IntegralClosure/IntegralRestrict.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	30	3	['github-actions', 'mathlib-merge-conflicts']	nobody	1-33805 1 day ago	1-33826 1 day ago	20-24344 20 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 label:t-algebra$	336/0	Mathlib/Algebra/Lie/Sl2.lean	1	8	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash', 'pion2024']	ocfnash assignee:ocfnash	1-32234 1 day ago	5-16536 5 days ago	2-57577 2 days
37661	pion2024 author:pion2024	feat(Algebra/Lie/Sl2): add lemma exists_primitiveVector	split 2 for the PR #37010	t-algebra new-contributor large-import label:t-algebra$	43/0	Mathlib/Algebra/Lie/Sl2.lean	1	2	['github-actions']	nobody	1-32181 1 day ago	1-33495 1 day ago	1-33485 1 day
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	55/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-30946 1 day ago	334-3135 334 days ago	0-1 1 second
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 merge-conflict	83/0	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	19	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	1-28675 1 day ago	2-80307 2 days ago	1-60149 1 day
37435	ADedecker author:ADedecker	feat: ContinuousLinearMap.pi as a continuous linear equivalence	--- - [ ] depends on: #37614 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR merge-conflict	191/52	Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/Spaces/CompactConvergenceCLM.lean,Mathlib/Topology/Algebra/Module/Spaces/ContinuousLinearMap.lean,Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	j-loreaux assignee:j-loreaux	1-28673 1 day ago	2-25347 2 days ago	3-42871 3 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/)	merge-conflict	86/65	Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean	2	2	['github-actions', 'mathlib-merge-conflicts']	nobody	1-27374 1 day ago	1-27375 1 day ago	3-33124 3 days
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	1-26221 1 day ago	unknown	0-0 0 seconds
36798	vihdzp author:vihdzp	chore: golf `Ordinal.isPrincipal_add_iff_zero_or_omega0_opow`	--- - [x] depends on: #36797 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	15/20	Mathlib/SetTheory/Ordinal/Principal.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-25965 1 day ago	1-25987 1 day ago	1-36352 1 day
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	awaiting-author t-analysis large-import please-adopt merge-conflict	334/33	Mathlib.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Topology/Algebra/Module/LinearSpan.lean,Mathlib/Topology/Algebra/Module/WeakBilin.lean	7	121	['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	1-24913 1 day ago	188-14511 188 days ago	17-41764 17 days
37648	vihdzp author:vihdzp	chore: make argument in `bddAbove_of_small` implicit	We use the theorem with an implicit argument much more (~80 times) than we use it with an explicit one (twice). We also deprecate the redundant `bddAbove_range` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	83/90	Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/Combinatorics/Matroid/Rank/Cardinal.lean,Mathlib/Data/W/Cardinal.lean,Mathlib/LinearAlgebra/Dimension/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/LinearAlgebra/Dimension/StrongRankCondition.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/RingTheory/AlgebraicIndependent/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Ordinal/Enum.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/SetTheory/ZFC/Cardinal.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean	23	1	['github-actions']	nobody	1-24742 1 day ago	1-24742 1 day ago	1-24739 1 day
37098	vihdzp author:vihdzp	feat: singular cardinals	We define a singular cardinal as an infinite cardinal which is larger than its cofinality. That's to say, every cardinal is exactly one of the following three: finite, regular, or singular. Re-opened from #17005, with permission. --- Co-authored-by: Nir Paz - [x] depends on: #36933 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	113/28	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	4	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'plp127']	nobody	1-23475 1 day ago	1-23527 1 day ago	12-74276 12 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	305/61	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/field.lean,MathlibTest/grind/grobner.lean,MathlibTest/grind/linarith.lean,MathlibTest/grind/lint.lean,MathlibTest/grind/pairwise_disjoint.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	35	5	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-23367 1 day ago	unknown	0-0 0 seconds
37544	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph/Coloring): move `ConcreteColorings.lean` and `EdgeLabeling.lean` to `Coloring/`	Moves `SimpleGraph/ConcreteColorings.lean` to `SimpleGraph/Coloring/Constructions.lean` and `SimpleGraph/EdgeLabeling.lean` to `SimpleGraph/Coloring/EdgeLabeling.lean`. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500) --- [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500) might want to rename `ConcreteColorings` (Edit: the poll chose `Constructions.lean`) #37546 adds module deprecations [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-combinatorics	2/2	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeLabeling.lean	3	1	['github-actions']	nobody	1-21006 1 day ago	1-21060 1 day ago	1-21194 1 day
37626	NoahW314 author:NoahW314	feat(Algebra/Algebra/Operations): add `Submodule.mul_eq_bot`	Generalize `Ideal.mul_eq_bot` to work for submodules as well. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	16/13	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Spectrum/Prime/Basic.lean	4	6	['artie2000', 'eric-wieser', 'github-actions']	nobody	1-20310 1 day ago	1-20366 1 day ago	2-62827 2 days
35518	kim-em author:kim-em	chore: forbid prime (') in filenames, rename LinearCombination'	This PR renames `Mathlib/Tactic/LinearCombination'.lean` to `LinearCombinationPrime.lean` (and the corresponding test file), and adds a lint check to `modulesOSForbidden` to prevent future files with prime/apostrophe characters in their names. The `'` character in filenames causes shell escaping issues in scripts (any `find ... -name '*.lean'` or similar pattern needs careful quoting to handle these files correctly). 🤖 Prepared with Claude Code	file-removed t-meta LLM-generated merge-conflict	13/8	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombinationPrime.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination_prime.lean	6	8	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	1-20109 1 day ago	1-20109 1 day ago	25-42954 25 days
37210	YaelDillies author:YaelDillies	refactor(Algebra/MvPolynomial): redefine `map` in terms of `AddMonoidAlgebra`	This is a step towards unifying `MvPolynomial` and `AddMonoidAlgebra` and making the latter a `structure`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	57/68	Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Rename.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Univ.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPowerSeries/Expand.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	12	8	['YaelDillies', 'eric-wieser', 'github-actions']	nobody	1-20088 1 day ago	1-20082 1 day ago	0-675 11 minutes
37643	dupuisf author:dupuisf	feat(CStarAlgebra): `x ↦ x ^ p` is operator concave for `p ∈ [0, 1]`	This PR shows that `x ↦ x ^ p` is operator concave (i.e. `CFC.nnrpow` is concave) on positive elements of a C*-algebra for `p ∈ [0, 1]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	192/12	Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Order.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/RingInverseOrder.lean	7	1	['github-actions']	nobody	1-19693 1 day ago	1-19750 1 day ago	1-27062 1 day
37546	SnirBroshi author:SnirBroshi	chore(Combinatorics/SimpleGraph): add module deprecations for #36819 #36854 #37525 #37544	--- - [ ] depends on: #37544 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	483/411	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Constructions.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/EdgeLabeling.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/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	15	2	['github-actions', 'mathlib-dependent-issues']	nobody	1-18900 1 day ago	4-20211 4 days ago	0-943 15 minutes
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/)		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	4	['erdOne', 'github-actions', 'joelriou']	nobody	1-18821 1 day ago	1-35357 1 day ago	1-36457 1 day
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 can split this PR, but first I'd like to get positive signals on the concept. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-combinatorics WIP	422/39	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Degree.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Data/Set/Card.lean,Mathlib/Data/Set/Insert.lean	7	27	['IvanRenison', 'SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	1-18732 1 day ago	64-45218 64 days ago	14-30359 14 days
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 - [ ] depends on: #37210 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	1083/1278	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/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/Eval.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Monad.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/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Univ.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/HopfAlgebra/MonoidAlgebra.lean,Mathlib/RingTheory/MvPolynomial/Basic.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/Expand.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	64	8	['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-18460 1 day ago	11-34661 11 days ago	0-840 14 minutes
25273	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 [![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$	1547/1670	Mathlib/Algebra/FreeAlgebra/Cardinality.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/Analysis/Fourier/BoundedContinuousFunctionChar.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Univ.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RingTheory/Coalgebra/MonoidAlgebra.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/Expand.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	82	97	['JovanGerb', 'YaelDillies', 'alreadydone', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	1-18396 1 day ago	276-34499 276 days ago	36-61320 36 days
35628	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Maps): characterize `neighborSet` and `edgeSet` across an embedding	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	66/0	Mathlib/Combinatorics/SimpleGraph/Maps.lean	1	10	['SnirBroshi', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	1-17872 1 day ago	1-86110 1 day ago	24-11448 24 days
37649	IvanRenison author:IvanRenison	feat(Data): add theorem `Finset.image_eq_iff_eq_preimage`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	20/0	Mathlib/Data/Finset/Preimage.lean,Mathlib/Data/Set/Function.lean	2	3	['github-actions', 'themathqueen']	nobody	1-17688 1 day ago	1-74177 1 day ago	1-74167 1 day
37631	linesthatinterlace author:linesthatinterlace	feat: add `Function.prod` and `Function.diag`	This PR adds `Function.prod` and `Function.diag` and develops API for them and `Pi.prod`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	246/54	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/CategoryTheory/Bicategory/Extension.lean,Mathlib/CategoryTheory/Bicategory/Kan/HasKan.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/LinearAlgebra/Goursat.lean,Mathlib/Logic/Function/Init.lean,Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/NumberTheory/Height/Basic.lean,Mathlib/SetTheory/Cardinal/Finite.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean	18	6	['SnirBroshi', 'eric-wieser', 'github-actions', 'linesthatinterlace']	nobody	1-17514 1 day ago	1-85545 1 day ago	2-6186 2 days
33313	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Coloring/Edge): create a basic edge-coloring API	Also moves `Coloring/VertexColoring.lean` to `Coloring/Vertex.lean`, see [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`) - [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 ⊤ = ⊤` Module name decided on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Coloring.20module.20names/with/583281500). - [x] depends on: #33292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics file-removed	291/6	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Edge.lean,Mathlib/Combinatorics/SimpleGraph/Coloring/Vertex.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Combinatorics/SimpleGraph/Partition.lean,Mathlib/Combinatorics/SimpleGraph/Sum.lean	8	16	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'ooovi']	nobody	1-17089 1 day ago	1-18828 1 day ago	14-48287 14 days
36018	wwylele author:wwylele	feat(LinearAlgebra/AffineSpace): shifting a subspace towards a point	This is preparing to calculate the volume of a simplex by integrating the cross-section created by shifting the base plane. Part of #34826. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	297/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Shift.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	3	7	['copilot-pull-request-reviewer', 'github-actions', 'mathlib-bors']	kim-em assignee:kim-em	1-16075 1 day ago	1-17267 1 day ago	25-74132 25 days
37027	mike1729 author:mike1729	refactor(LocallyConvex,Topology): split WeakDual/WeakSpace and rename WeakBilin	Reorganize the weak topology files for cleaner dependencies: 1. Rename `Analysis.LocallyConvex.WeakDual` → `Analysis.LocallyConvex.WeakBilin`: This file contains only general `WeakBilin` infrastructure (`LinearMap.toSeminormFamily`, `weakBilin_withSeminorms`, `WeakBilin.locallyConvexSpace`, etc.) with no reference to `WeakDual`. The name now reflects the content. 2. Split `Topology.Algebra.Module.Spaces.WeakDual` into `WeakDual` and `WeakSpace`: The `WeakSpace` type, its instances, and `toWeakSpace/toWeakSpaceCLM` move to a new `Topology.Algebra.Module.Spaces.WeakSpace`. This allows downstream files about weak spaces to avoid depending on WeakDual. 3. Add `WeakSpace.seminormFamily` and `WeakSpace.withSeminorms` to `Analysis.LocallyConvex.WeakSpace`: The weak topology on `WeakSpace 𝕜 E` is generated by the seminorm family `fun f x ↦ ‖f x‖` indexed by `StrongDual 𝕜 E`, via the general `LinearMap.weakBilin_withSeminorms` applied to the flipped `topDualPairing`. Moves: - Mathlib.Analysis.LocallyConvex.WeakDual → Mathlib.Analysis.LocallyConvex.WeakBilin - WeakSpace → Mathlib.Topology.Algebra.Module.Spaces.WeakSpace - toWeakSpace → Mathlib.Topology.Algebra.Module.Spaces.WeakSpace - toWeakSpaceCLM → Mathlib.Topology.Algebra.Module.Spaces.WeakSpace CC @j-loreaux --- - [ ] depends on: #37314	new-contributor file-removed	192/114	Mathlib.lean,Mathlib/Analysis/LocallyConvex/WeakBilin.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/Algebra/Module/Spaces/WeakDual.lean,Mathlib/Topology/Algebra/Module/Spaces/WeakSpace.lean	6	6	['github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	1-15652 1 day ago	1-15846 1 day ago	11-30891 11 days
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	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	1-15453 1 day ago	7-19099 7 days ago	0-832 13 minutes
36681	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Principal): 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. - [ ] depends on: #36664 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR	91/0	Mathlib.lean,Mathlib/SetTheory/Ordinal/Commute.lean,Mathlib/SetTheory/Ordinal/Principal.lean	3	20	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	vihdzp assignee:vihdzp	1-14631 1 day ago	18-43508 18 days ago	3-66743 3 days
36664	SnirBroshi author:SnirBroshi	feat(SetTheory/Ordinal/Commute): characterize when ordinal addition commutes	--- The proof is from ["Cardinal and Ordinal Numbers"](https://en.wikipedia.org/wiki/Cardinal_and_Ordinal_Numbers). A similar fact for multiplication is mentioned on [Wikipedia](https://en.wikipedia.org/wiki/Ordinal_arithmetic). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	51/0	Mathlib.lean,Mathlib/SetTheory/Ordinal/Commute.lean,docs/references.bib	3	20	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	alreadydone and vihdzp assignee:alreadydone assignee:vihdzp	1-14599 1 day ago	21-63309 21 days ago	22-32014 22 days
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	1-14138 1 day ago	27-14688 27 days ago	0-79432 22 hours
36773	adomasbaliuka author:adomasbaliuka	feat(Tactic/Linter): lint unwanted unicode	Add a text-based style linter that checks all unicode characters. Provides automatic replacements for some disallowed characters. Unicode is very versatile and useful for Lean and Mathlib. However, it is also very complex and few people have a thorough understanding of all its pitfalls (I don't claim to be one of them). In order to avoid unpleasant surprises going forward, both accidental and malicious, we should keep track of which Unicode characters are allowed in Mathlib. In programming and cybersecurity, there are many known [issues and attacks concerning unicode](https://en.wikipedia.org/wiki/Unicode#Security_issues). Many open source repositories have been hit by such attacks, which are becoming ever more frequent due to the use of automation using e.g. large language models. Some notable ones: - [homograph attacks](https://en.wikipedia.org/wiki/IDN_homograph_attack): confusion caused by use of distinct characters which look the same (we probably don't want to fully address this and this PR does not attempt to) - [Trojan Source](https://en.wikipedia.org/wiki/Trojan_Source): abuse of bidirectional characters. Characters used by languages with right-to-left reading direction can cause code to be displayed differently than it is parsed. (This PR tries to address this) - Exploits involving Private Use Area characters, e.g. [GlassWorm](https://abit.ee/en/cybersecurity/viruses-trojans-and-other-malware/glassworm-github-supply-chain-attack-unicode-solana-malware-npm-vs-code-2026-en). (This PR tries to address this) Co-authored-by: Michael Rothgang @grunweg Co-authored-by: Jon Eugster @joneugster --- Continues work from #16215 (due to PRs now being made from forks). Discussed at [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F/near/448721083) Note: the script was added due to reviewer comment in #16215. Perhaps that is overkill here. - [x] depends on: #36811 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter	252/75	Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/TextBased/UnicodeLinter.lean,MathlibTest/LintStyle.lean,scripts/README.md,scripts/extract-unique-nonascii.lean	6	24	['adomasbaliuka', 'github-actions', 'joneugster', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	joneugster assignee:joneugster	1-13599 1 day ago	8-18051 8 days ago	12-79176 12 days
33715	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Projectivization/Action): prove that the action is 2-transitive and primitive	Define the action of the special linear group on the projectivization. Prove that it is 2-transitive and primitive. --- - [ ] depends on: #33387 - [ ] depends on: #33347 - [ ] depends on: #32757 [![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$	259/4	Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Transvection/Basic.lean	6	11	['github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	1-13590 1 day ago	1-13590 1 day ago	6-23659 6 days
28462	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the relative cell complex attached to a rank function for a pairing	WIP From https://github.com/joelriou/topcat-model-category --- - [ ] depends on: #37668 - [ ] depends on: #37333 - [x] depends on: #37334 - [x] depends on: #37332 - [x] depends on: #37335 - [x] depends on: #32515 - [x] depends on: #32517 - [x] depends on: #32178 - [x] depends on: #32180 - [x] depends on: #31122 - [x] depends on: #28351 - [x] depends on: #28346 - [x] depends on: #28336 - [x] depends on: #28332 - [x] depends on: #28330 - [x] depends on: #28224 - [x] depends on: #27968 - [x] depends on: #28034 - [x] depends on: #26076 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology WIP blocked-by-other-PR	761/3	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/IsUniquelyCodimOneFace.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RelativeCellComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/CategoryTheory/Limits/Types/Coproducts.lean,Mathlib/CategoryTheory/Subfunctor/Basic.lean	7	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-13003 1 day ago	234-40850 234 days ago	0-1 1 second
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	18/0	Mathlib/Order/RelIso/Basic.lean	1	6	['IvanRenison', 'SnirBroshi', 'eric-wieser', 'github-actions']	nobody	1-12898 1 day ago	1-12898 1 day ago	2-36423 2 days
34131	Ruben-VandeVelde author:Ruben-VandeVelde	fix: update create_deprecated_modules.lean	--- This is a wip; I'm hoping someone can pick it up and make sure CI builds it going forward. @adomani @kim-em any takers? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP CI	26/22	scripts/create_deprecated_modules.lean	1	4	['adomani', 'bryangingechen', 'github-actions', 'grunweg']	nobody	1-12530 1 day ago	77-32022 77 days ago	0-1 1 second
37307	vihdzp author:vihdzp	feat: a lot of results on `DirSupClosed`	This is just a work branch; I'll split off a bunch of PRs from this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-order	208/14	Mathlib/Order/DirSupClosed.lean,Mathlib/Order/Directed.lean,Mathlib/Topology/Order/ScottTopology.lean	3	4	['github-actions', 'mathlib-merge-conflicts']	nobody	1-12250 1 day ago	unknown	0-0 0 seconds
37312	CoolRmal author:CoolRmal	feat(MeasureTheory): Outer regular measures are determined by values on bounded open sets	We proved that - Every open set in a metric space is a countable union of bounded open sets. - Outer regular measures are determined by values on bounded open sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	19/0	Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Topology/MetricSpace/Bounded.lean	2	2	['github-actions', 'kex-y']	kex-y assignee:kex-y	1-11740 1 day ago	2-80653 2 days ago	9-29445 9 days
37545	vihdzp author:vihdzp	feat: ℵ_ univ = univ	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	75/4	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	3	5	['github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	nobody	1-11170 1 day ago	1-11112 1 day ago	4-18336 4 days
37637	IlPreteRosso author:IlPreteRosso	feat(Analysis/Calculus/FDeriv): add fderiv_apply simp lemmas	Add `@[simp]` lemmas `fderiv_apply` and `fderivWithin_apply` that extract a component from the fderiv of a Pi-type function: `(proj i).comp (fderiv 𝕜 Φ x) = fderiv 𝕜 (fun x => Φ x i) x`. This completes the extraction direction of the Pi fderiv API alongside the existing construction direction (`fderiv_pi`).	t-analysis easy new-contributor	9/0	Mathlib/Analysis/Calculus/FDeriv/Prod.lean	1	9	['IlPreteRosso', 'eric-wieser', 'github-actions', 'themathqueen']	nobody	1-10830 1 day ago	1-17261 1 day ago	1-60943 1 day
36760	SnirBroshi author:SnirBroshi	feat(GroupTheory/Subgroup): basic API for set normalizers	--- Since `@[to_additive]` [doesn't work](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/MulAut.20and.20to_additive/with/577355267) on `MulAut` (because `AddAut` wants to use multiplicative syntax) I've had to translate 2 theorems manually. ~~FWIW I think that `setNormalizer` should replace `normalizer`, as this old TODO says:~~ https://github.com/leanprover-community/mathlib4/blob/34ad346d5509066e2d41dc59c6a92a917ba55661/Mathlib/Algebra/Group/Subgroup/Defs.lean#L674 ~~This will join `Subgroup.centralizer` which is already defined on sets rather than subgroups (and subgroups can use it thanks to their `SetLike`).~~ ~~If you agree I'll create a separate PR that does it. Though it shouldn't block this PR.~~ - [x] depends on: #36852 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	109/31	Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean	6	12	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'tb65536']	tb65536 assignee:tb65536	1-10053 1 day ago	1-10109 1 day ago	18-29318 18 days
37293	peabrainiac author:peabrainiac	feat(Order/Partition): finite meets of partitions of frames	For any frame `α`, `Partition α` has finite meets: the meet of two partitions `P`, `Q` can be constructed as the partition consisting of all meets `p ⊓ q` with `p ∈ P`, `q ∈ Q` and `p ⊓ q ≠ ⊥`. Note that even for frames `Partition α` does not have arbitrary meets: for example, there is no finest partition on the frame of open subsets of the Cantor space. We thus have to construct the remaining operations by hand instead of e.g. just transporting a `CompleteLattice` instance along some Galois connection. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	44/2	Mathlib/Order/Partition/Basic.lean	1	2	['github-actions', 'mathlib-merge-conflicts']	Vierkantor assignee:Vierkantor	1-2217 1 day ago	1-2217 1 day ago	8-72451 8 days
37588	Vierkantor author:Vierkantor	feat(Linter/DocString): ignore Verso linter errors about links and LaTeX	I went through [the weekly linting log](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Weekly.20linting.20log/near/582485221) and found most of the warnings come from three sources. All of these are sensical syntax in our current Markdown dialect, and should be fixed automatically by a script, instead of manually. I expect after these changes we'll be down to hundreds of linter errors rather than two thousand. * References [between square brackets] without a following link URL. Verso has different implementations for references depending on what kind they are, and since there are a thousand references we should be using a script to fix these. * Autolinks: bare URLs or URLs between . Autolinks are intentionally not supported by Verso but replacing every `https://...` with `[https://...](https://...)` would be too noisy. * LaTeX blocks: Verso does have TeX blocks but with an incompatible syntax. Better to fix it with a script. I ended up using preprocessing in addition to postprocessing to filter out errors: using the error message we can determine whether it is a reference, but for errors caused by autolinks and LaTeX blocks I couldn't figure out how to do so easily: the information about the parse error does report a string position but this is always the last character of the docstring. So instead we modify the docstring before it is passed into Verso to get rid of the offending syntax. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter large-import awaiting-author	32/2	Mathlib/Tactic/Linter/DocString.lean	1	8	['github-actions', 'thorimur']	thorimur assignee:thorimur	1-2159 1 day ago	1-2159 1 day ago	2-35847 2 days
37506	wwylele author:wwylele	feat(Analysis/InnerProductSpace): singleton basis for 1d space	This was brought up in #36462. Similar to existing `FiniteDimensional.basisSingleton`, this provides a OrthonormalBasis version. Also adds simp lemma for `∀ (i j : ι), P i j` for subsingleton `ι`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	49/4	Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Diam.lean,Mathlib/Logic/Basic.lean	5	35	['eric-wieser', 'github-actions', 'leanprover-radar', 'loefflerd', 'themathqueen', 'wwylele']	loefflerd assignee:loefflerd	1-866 1 day ago	1-25362 1 day ago	4-72003 4 days
37550	pitmonticone author:pitmonticone	feat(Topology/Order): add `IsMax.of_disjoint_nhds_Ioi`, `IsMin.of_disjoint_nhds_Iio`, `nonempty_nhds_inter_Ioi`, `nonempty_nhds_inter_Iio`	Add `nonempty_nhds_inter_Ioi`: a neighborhood of `x` has nonempty intersection with `Ioi x` when `x` is not a maximum. Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: Leo Diedering <129694072+ldiedering@users.noreply.github.com> Co-authored-by: Michael Rothgang ---	carleson t-topology	20/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	5	['ADedecker', 'eric-wieser', 'github-actions', 'pitmonticone']	urkud assignee:urkud	1-784 1 day ago	1-875 1 day ago	4-953 4 days
37675	vihdzp author:vihdzp	feat: `Order.cof Ordinal = univ`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order	11/0	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	1	['github-actions']	nobody	0-85535 23 hours ago	0-85609 23 hours ago	0-85599 23 hours
37676	IvanRenison author:IvanRenison	feat(Data/Finset/Preimage): add lemmas about `Equiv.symm`	--- `Finset` version of lemmas already existing for `Set`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	15/0	Mathlib/Data/Finset/Preimage.lean	1	1	['github-actions']	nobody	0-82465 22 hours ago	0-82546 22 hours ago	0-82536 22 hours
37622	jano-wol author:jano-wol	feat: trace-nilpotency criterion	Trace-nilpotency criterion --- This PR proves that over an algebraically closed field of characteristic zero, given subspaces `A ≤ B` of `Module.End K V` and the set `M A B = {x \| ∀ b ∈ B, ⁅x, b⁆ ∈ A}`, any `x ∈ M A B` satisfying `tr (x * y) = 0` for all `y ∈ M A B` is nilpotent. Cartan's criterion proof overview following Humphreys, Ch. 4, pp. 31–32. We plan to deliver the proof in 3 steps: 1. This PR: Prove the trace-nilpotency criterion over algebraically closed fields. Uses Jordan–Chevalley decomposition, Lagrange interpolation. 2. Remove the algebraic closure assumption by scalar extension. 3. Prove Cartan's criterion by Engel's theorem + PR 2. This is the easiest out of the three steps. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	279/0	Mathlib.lean,Mathlib/Algebra/Lie/AdjointAction/JordanChevalley.lean,Mathlib/Algebra/Lie/NilpotentOfTrace.lean	3	3	['github-actions', 'ocfnash']	nobody	0-82036 22 hours ago	2-80440 2 days ago	2-80430 2 days
37678	vihdzp author:vihdzp	chore(Dynamics/FixedPoints/Defs): create `Defs` file	--- I got a large import warning on another PR for simply importing the definition `Function.fixedPoints`, which I found rather silly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics tech debt	67/44	Mathlib.lean,Mathlib/Dynamics/FixedPoints/Basic.lean,Mathlib/Dynamics/FixedPoints/Defs.lean,Mathlib/Logic/Function/Defs.lean	4	1	['github-actions']	nobody	0-78223 21 hours ago	0-78099 21 hours ago	0-78667 21 hours
37670	vihdzp author:vihdzp	feat: miscellaneous results on `DirSupClosed`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	76/8	Mathlib/Order/DirSupClosed.lean	1	1	['github-actions']	nobody	0-77596 21 hours ago	0-77599 21 hours ago	1-11897 1 day
37681	vihdzp author:vihdzp	chore: move `Ordinal.univ` and `Cardinal.univ` to their own file	This ensures `SetTheory/Ordinal/Basic` stays under the 1500 line limit. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory tech debt	186/147	Mathlib.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/UnivLE.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Univ.lean	5	1	['github-actions']	nobody	0-72298 20 hours ago	0-72352 20 hours ago	0-73752 20 hours
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. - [ ] depends on: #37670 - [ ] depends on: #37678 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-set-theory t-order	193/8	Mathlib.lean,Mathlib/Order/Club.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-72000 20 hours ago	0-79304 22 hours ago	0-262 4 minutes
37610	Jun2M author:Jun2M	feat(Combinatorics/Graph): `OrderBot` instance for `Graph`	This PR adds an `OrderBot` instance for `Graph α β`, where the bottom element `⊥` is the empty graph (no vertices, no edges). Co-authored-by: Peter Nelson [apn.uni@gmail.com](mailto:apn.uni@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	90/8	Mathlib/Combinatorics/Graph/Subgraph.lean	1	1	['github-actions']	nobody	0-70831 19 hours ago	3-6302 3 days ago	3-6798 3 days
37620	Jun2M author:Jun2M	feat(Combinatorics/Graph): `Graph` intersection operations	Adds `Mathlib/Combinatorics/Graph/InterUnion.lean`, which defines intersections of Graph α β values and proves the lattice structure induced by binary intersection. Following PR will add the union operations to this file. ## Main additions - `Graph.iInter`: intersection of a nonempty indexed family of graphs. Vertices are the intersection of vertex sets; an edge is kept iff it is a link in every graph with a common pair of endpoints (pairwise compatibility is assumed where needed). - `Graph.sInter`: Infimum of a nonempty `Set (Graph α β)`, defined via `iInter` on the subtype. - `Graph.inter`: Binary intersection. Vertices are `V(G) ∩ V(H)`. Edges are those in both edge sets on which `G` and `H` agree on `IsLink` for all endpoint pairs; `IsLink` on the intersection is conjunction of the two `IsLink` predicates. - Proof of `SemilatticeInf (Graph α β)` Co-authored-by: Peter Nelson [apn.uni@gmail.com](mailto:apn.uni@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	149/0	Mathlib.lean,Mathlib/Combinatorics/Graph/InterUnion.lean	2	5	['Jun2M', 'github-actions', 'vihdzp']	nobody	0-70801 19 hours ago	2-83357 2 days ago	2-83448 2 days
37673	Jun2M author:Jun2M	feat(Analysis/Complex/Circle): `ContinuousNeg` instance for `Circle`	I was surprised to find Lean not understanding `(-1 : Circle)`. This PR fixes it by adding a couple instances for `Circle`, although perhaps `Circle` should be defined as `Unitary ℂ`. It adds: - `HasDistribNeg Circle` - `ContinuousNeg Circle` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	4/3	Mathlib/Analysis/Complex/Circle.lean	1	1	['github-actions']	nobody	0-70794 19 hours ago	1-7938 1 day ago	1-8110 1 day
36691	Jun2M author:Jun2M	feat(Order/Partition): every partition has `IsRepFun`	This PR expands the API for `Setoid.Partition` (or `Partition`) by introducing definitions and lemmas for working with representatives and specific parts of a partition. ### Key Additions * `Partition.rep`: Noncomputably chooses a representative from a given part of a partition, along with basic membership lemmas (`rep_mem`, `rep_mem'`). * `Partition.partOf`: Defines the part of a partition containing a specific element (evaluates to `∅` if the element is not in the underlying set). * `IsRepFun` extensions: * `exists_extend_partial` / `exists_extend_partial'`: Proves that partially defined representative functions can be extended to complete ones. * `nonempty`: Proves that every partition admits at least one representative function. Co-authored-by: Peter Nelson --- - [x] depends on: #36574 - [x] depends on: #36991 - [ ] depends on: #36993 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-order merge-conflict	345/1	Mathlib/Order/Partition/Basic.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-70777 19 hours ago	22-7247 22 days ago	0-233 3 minutes
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	95/0	Mathlib.lean,Mathlib/Data/Sym/Sym2/Card.lean	2	1	['github-actions']	nobody	0-69929 19 hours ago	27-19136 27 days ago	27-19126 27 days
35285	SnirBroshi author:SnirBroshi	feat(Algebra/LinearRecurrence): define a standard basis for the solution space of a linear recurrence	Also `mkSol` is injective. --- The hard work was already done by the existing equivalence `toInit`; this defines the basis that the equivalence provides and uses it to simplify a couple of proofs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	24/12	Mathlib/Algebra/LinearRecurrence.lean	1	1	['github-actions']	nobody	0-69928 19 hours ago	51-58268 51 days ago	51-58258 51 days
35826	quangvdao author:quangvdao	feat(Probability/ProbabilityMassFunction): total variation distance and MetricSpace instance	Define total variation distance on probability mass functions, provide a `MetricSpace` instance, and prove the data processing inequality. The extended TV distance `PMF.etvDist` is defined in `ℝ≥0∞` as `(1/2) ∑ x, absDiff (p x) (q x)`, using a new symmetric absolute difference `ENNReal.absDiff`. The real-valued `PMF.tvDist` is its `toReal`. New definitions: - `ENNReal.absDiff`: symmetric absolute difference `(a - b) + (b - a)` - `PMF.etvDist`: extended total variation distance - `PMF.tvDist`: real-valued total variation distance - `PMF.instMetricSpace`: `MetricSpace` instance on `PMF α` Main results: - `ENNReal.absDiff_triangle`: triangle inequality for `absDiff` - `ENNReal.absDiff_tsum_le`: subadditivity over infinite sums - `PMF.etvDist_le_one`: TV distance is at most 1 - `PMF.etvDist_map_le`: data processing inequality (deterministic maps) - `PMF.etvDist_bind_right_le`: data processing inequality (Markov kernels) - `PMF.etvDist_option_punit`: closed form for binary distributions Supersedes #33680 with a complete, sorry-free implementation. See Zulip discussion: This PR was authored with the support of Claude (Cursor IDE). --- This PR provides a complete formalization of total variation distance for PMFs, including: 1. `ENNReal.absDiff` (`Mathlib/Data/ENNReal/AbsDiff.lean`): A symmetric absolute difference for `ℝ≥0∞` with triangle inequality, connection to real absolute value, and algebraic properties. The tsum-related lemmas (`absDiff_tsum_le`, `tsum_fiber`) are placed in the TV distance file to avoid pulling topology imports into `Data.ENNReal`. 2. `PMF.etvDist` / `PMF.tvDist` (`Mathlib/Probability/ProbabilityMassFunction/TotalVariation.lean`): Total variation distance with a `MetricSpace` instance, data processing inequality for both deterministic maps and Markov kernels, and a closed form for binary distributions. Compared to #33680, this PR: - Has no `sorry`s - Defines the distance in `ℝ≥0∞` first (following Mathlib convention for `edist`/`dist`) - Includes the data processing inequality - Has full documentation and passes all Mathlib linters Made with [Cursor](https://cursor.com)	t-measure-probability LLM-generated	459/0	Mathlib.lean,Mathlib/Data/ENNReal/AbsDiff.lean,Mathlib/Probability/ProbabilityMassFunction/TotalVariation.lean	3	6	['BoltonBailey', 'EtienneC30', 'github-actions', 'joneugster', 'quangvdao']	nobody	0-69927 19 hours ago	30-83130 30 days ago	30-83901 30 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	291/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Maximal.lean	2	4	['github-actions', 'lua-vr', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	ADedecker assignee:ADedecker	0-69663 19 hours ago	32-25070 32 days ago	32-25430 32 days
35535	mariainesdff author:mariainesdff	feat(RingTheory/ClassGroup): prove mulEquiv	We prove that isomorphic rings have isomorphic class groups. Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	233/9	Mathlib/Algebra/Ring/CompTypeclasses.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/Basic.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	6	29	['erdOne', 'eric-wieser', 'github-actions', 'mariainesdff', 'mathlib-merge-conflicts', 'tb65536']	jcommelin assignee:jcommelin	0-69661 19 hours ago	31-19260 31 days ago	38-63745 38 days
37278	SnirBroshi author:SnirBroshi	chore(Order/Defs/Unbundled): deprecate `def Reflexive` in favor of `class Std.Refl`	Also adds definitional lemmas `std*_def` for the relation classes, and cleans up things nearby, especially in `Logic/Relation.lean`. --- [Mathlib's `def Reflexive`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Defs/Unbundled.html#Reflexive) [Core's `class Std.Refl`](https://leanprover-community.github.io/mathlib4_docs/Init/Core.html#Std.Refl) [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	229/171	Mathlib/Algebra/Group/Semiconj/Defs.lean,Mathlib/CategoryTheory/Abelian/Pseudoelements.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/WSeq/Relation.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Pairwise.lean,Mathlib/Logic/Relation.lean,Mathlib/ModelTheory/Order.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/Directed.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/Quotient.lean,Mathlib/Order/ScottContinuity.lean,Mathlib/Order/SuccPred/Relation.lean,MathlibTest/abel.lean	20	3	['SnirBroshi', 'github-actions', 'leanprover-radar']	bryangingechen assignee:bryangingechen	0-69660 19 hours ago	10-4323 10 days ago	10-6114 10 days
37311	CoolRmal author:CoolRmal	feat: lemmas about liminf multiplied by a constant	Add some analogues of [ENNReal.limsup_const_mul_of_ne_top](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Filter/ENNReal.html#ENNReal.limsup_const_mul_of_ne_top) for liminf. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	34/5	Mathlib/Order/Filter/ENNReal.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	0-69659 19 hours ago	9-29708 9 days ago	9-30040 9 days
37419	vasnesterov author:vasnesterov	feat(Tactic/ComputeAsymptotics/Multiseries): introduce `MultiseriesExpansion.Approximates`	* Introduce `MultiseriesExpansion.Approximates` predicate meaning that a multiseries can be used to obtain an asymptotical approximations of its attached function. * Provide constructors (`nil`, `cons`), a coinductive principle, and basic constructions for `Approximates`. --- 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 large-import	132/2	Mathlib/Tactic/ComputeAsymptotics/Multiseries/Defs.lean	1	1	['github-actions']	dwrensha assignee:dwrensha	0-69658 19 hours ago	6-41804 6 days ago	6-41794 6 days
37441	lecopivo author:lecopivo	fix(FunProp): be less strict about the shape of morphism theorems	Don't be so restrictive about the shape of morphism theorems Right now, `fun_prop` has a problem with a bundled morphism `Foo α` that coerces to `α → α → α` . The coerced function has two arguments and there is an unnecessary restriction about this. This PR lifts that restriction. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60fun_prop.60.20in.20.60FunLike.60.20with.20multiple.20arguments/with/582731349) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	42/14	Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Theorems.lean,MathlibTest/fun_prop_dev.lean	3	1	['github-actions']	adamtopaz assignee:adamtopaz	0-69657 19 hours ago	6-20364 6 days ago	6-20402 6 days
37447	xgenereux author:xgenereux	feat(FunctionField): a function field is finite over `Fq(y)` for transcendental `y`	Given `F` a function field over `Fq`, we know by assumption that it is finite over `RatFunc Fq`. This PR adds the result that it is also finite over `Fq(y)` for any transcendental `y` over `Fq`. Notes: 1. Instance synthesis is known to be slow with `IntermediateField`, so we guide it in the proof of `finiteDimensional_of_adjoin_transcendental`. 2. While looking for the proof of `Module.Finite.top_left`, it took me a while to find `Module.Finite.of_surjective` as I was looking for equiv lemmas. I've added a comment in the docstring of `Module.Finite.of_equiv_equiv` to ease discovery. 3. Since `LinearMap.id'` requires `σ` to have the same domain and codomain, we explicitly provide a generalized version of it in the proof of `Module.Finite.top_left`. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #37397 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	64/0	Mathlib/NumberTheory/FunctionField.lean,Mathlib/RingTheory/Finiteness/Basic.lean	2	2	['github-actions', 'mathlib-dependent-issues']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-69656 19 hours ago	1-58457 1 day ago	2-45106 2 days
37456	Robertboy18 author:Robertboy18	feat(LinearAlgebra/AffineSpace): add Desargues's theorem	This PR adds an affine (parallel) version of Desargues's theorem! Main changes - New file `Mathlib/LinearAlgebra/AffineSpace/Desargues.lean` with `parallel_third_side_of_perspective`: if two triangles are in perspective from a point `S` and two pairs of corresponding sides are parallel, then the third pair of sides is parallel. - Add the corresponding `public import` to `Mathlib.lean`. - Update `docs/100.yaml` (entry #87) to point to the new declaration. High level Proof idea is from the rocq repository! Compare side vectors via `exists_eq_smul_of_parallel` for the two given pairs of parallel sides; the shared comparison along `SA` forces the same scalar, yielding parallelism of the third sides. Tests: `lake build Mathlib.LinearAlgebra.AffineSpace.Desargues`!	t-algebra new-contributor label:t-algebra$	159/0	Mathlib.lean,Mathlib/LinearAlgebra/AffineSpace/Desargues.lean,docs/100.yaml	3	8	['Robertboy18', 'SnirBroshi', 'copilot-pull-request-reviewer', 'github-actions', 'wwylele']	eric-wieser assignee:eric-wieser	0-69655 19 hours ago	5-85309 5 days ago	6-7139 6 days
37614	ADedecker author:ADedecker	feat: notation for `UniformConvergenceCLM`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	72/52	Mathlib/Topology/Algebra/Module/Spaces/UniformConvergenceCLM.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	0-69654 19 hours ago	3-4997 3 days ago	3-4987 3 days
37619	FernandoChu author:FernandoChu	feat(topology): Small inductive dimension	Adds a type class for small inductive dimension. See also https://github.com/leanprover-community/mathlib4/pull/37444. Co-authored-by: Andrew Yang [the.erd.one@gmail.com](mailto:the.erd.one@gmail.com) AI disclosure: Claude code assisted in preparing this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	76/0	Mathlib.lean,Mathlib/Topology/SmallInductiveDimension.lean	2	3	['FernandoChu', 'github-actions', 'vihdzp']	ocfnash assignee:ocfnash	0-69654 19 hours ago	2-19414 2 days ago	2-21404 2 days
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	107/36	Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/MeasureTheory/Measure/Restrict.lean	2	1	['github-actions']	kex-y assignee:kex-y	0-69653 19 hours ago	1-56005 1 day ago	1-56269 1 day
37656	joelriou author:joelriou	feat(AlgebraicTopology): simplicial homology	This PRs add some API for simplicial homology, the homology of simplicial sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology file-removed	200/56	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Homology/HomotopyInvariance.lean,Mathlib/AlgebraicTopology/SingularHomology/Basic.lean,Mathlib/AlgebraicTopology/SingularHomology/HomotopyInvarianceTopCat.lean	5	3	['erdOne', 'github-actions', 'joelriou']	robin-carlier assignee:robin-carlier	0-69652 19 hours ago	1-42236 1 day ago	1-42266 1 day
37665	e-271828 author:e-271828	feat(MeasureTheory.Integral): add intervalIntegral_re and intervalIntegral_im	This PR adds `intervalIntegral_re` and `intervalIntegral_im` to `Mathlib.MeasureTheory.Integral.IntervalIntegral.Basic`, applying the existing `ContinuousLinearMap.intervalIntegral_comp_comm` to `Complex.reCLM` and `Complex.imCLM`. This fills a minor API gap, as the `integral_re` and `integral_im` equivalents already exist for Lebesgue integrals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability new-contributor	14/0	Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean	1	2	['github-actions']	RemyDegenne assignee:RemyDegenne	0-69650 19 hours ago	1-16366 1 day ago	1-16356 1 day
37668	joelriou author:joelriou	chore(CategoryTheory/Subfunctor): use Sort* instead of Type* for some lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory easy	3/3	Mathlib/CategoryTheory/Subfunctor/Basic.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	0-69649 19 hours ago	1-14289 1 day ago	1-14279 1 day
37674	gasparattila author:gasparattila	feat(Topology/Sets): separation properties of `(Nonempty)Compacts`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	86/0	Mathlib/Topology/Sets/VietorisTopology.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	0-69648 19 hours ago	1-4531 1 day ago	1-4521 1 day
31242	plp127 author:plp127	feat: express filter as supremum of principal filter and free filter	Prove a filter is free iff it is smaller than the cofinite filter. Prove that every filter decomposes as the disjoint supremum of a principal filter and a free filter. --- - [x] depends on: #31264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order maintainer-merge	78/4	Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Heyting/Boundary.lean,Mathlib/Order/Lattice.lean	4	10	['Komyyy', 'YaelDillies', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	0-69479 19 hours ago	9-15319 9 days ago	33-38156 33 days
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	0-69245 19 hours ago	70-76005 70 days ago	5-82220 5 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`.	t-computability	291/110	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,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/CompleteLattice/Basic.lean	10	19	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'mathlib-merge-conflicts']	YaelDillies assignee:YaelDillies	0-66717 18 hours ago	0-64449 17 hours ago	11-26287 11 days
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	95/49	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Monotone.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	0-66701 18 hours ago	0-66702 18 hours ago	0-1299 21 minutes
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	86/49	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	3	['github-actions', 'mathlib-dependent-issues']	nobody	0-66700 18 hours ago	0-66701 18 hours ago	0-1447 24 minutes
37603	Parcly-Taxel author:Parcly-Taxel	refactor: `SetSemiring` as a 1-field structure	Ultimately inspired by https://github.com/leanprover-community/mathlib4/pull/36934#issuecomment-4183475568. --- - [ ] depends on: #35963	large-import blocked-by-other-PR	109/105	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Data/Set/Semiring.lean	3	8	['Parcly-Taxel', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-66690 18 hours ago	3-11708 3 days ago	0-1770 29 minutes
31508	FLDutchmann author:FLDutchmann	feat(Tactic): `algebra` tactic.	Implement tactic 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. The core of this tactic is used by a larger suite of tactics (see #30374). --- - [x] depends on: #31506 - [ ] depends on: #34734 For full disclosure, most of the lemma statements in `Lemmas.lean` were generated by an LLM. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author merge-conflict	2484/1163	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/Common.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/Algebra.lean,MathlibTest/ring.lean,scripts/noshake.json	11	18	['FLDutchmann', 'Vierkantor', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	0-66471 18 hours ago	123-15197 123 days ago	9-83430 9 days
37500	Thmoas-Guan author:Thmoas-Guan	refactor(RingTheory/Ideal/Heoght): minimize usages of `Ideal.primeHeight` and add lemma for `minimalPrimes`	1: `minimalPrimes` is prime 2: deprecate and private almost all `primeHeight` APIs --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	171/154	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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	6	6	['Thmoas-Guan', 'erdOne', 'github-actions']	nobody	0-61979 17 hours ago	3-28052 3 days ago	5-21186 5 days
37627	Thmoas-Guan author:Thmoas-Guan	refactor(RingTheory/Ideal/Height): torwards private `Ideal.primeHeight`	--- - [ ] depends on: #37500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-ring-theory blocked-by-other-PR	232/177	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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	6	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-61966 17 hours ago	2-47787 2 days ago	0-92 1 minute
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: #37500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	506/154	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean	11	53	['Raph-DG', 'Thmoas-Guan', 'WenrongZou', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	0-61931 17 hours ago	5-20863 5 days ago	1-38588 1 day
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. --- - [ ] depends on: #28684 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	190/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean	3	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-61893 17 hours ago	202-51666 202 days ago	0-251 4 minutes
31219	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): lemma about `IsBaseChange` under exact sequence	In this lemma, we proved cokernel preserve `IsBaseChange S` and kernel preserve `IsBaseChange S` when `S` is flat. Co-authored-by: Wang Jingting --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	173/0	Mathlib.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	4	17	['Thmoas-Guan', 'chrisflav', 'erdOne', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	mariainesdff assignee:mariainesdff	0-61877 17 hours ago	3-43567 3 days ago	27-22103 27 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 - [ ] depends on: #31219 - [x] depends on: #31696 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-algebra label:t-algebra$	222/0	Mathlib.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	5	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-61857 17 hours ago	154-24332 154 days ago	0-266 4 minutes
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`. --- - [ ] depends on: #31046 - [ ] depends on: #31222 - [ ] 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	906/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	12	5	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60233 16 hours ago	98-30007 98 days ago	0-1554 25 minutes
31697	Thmoas-Guan author:Thmoas-Guan	feat(Homology): bijection between `Ext`	For `F : C ⥤ D` fully faithful functor between abelian category, if one of the following 1: `C` has enough projectives and `F` preserve projective object 2: `D` has enough injectives and `F` preserve injective object The induced map `Ext X Y n → Ext F(X) F(Y) n` is bijective. --- - [ ] depends on: #31046 - [x] depends on: #31696 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR t-category-theory label:t-algebra$	360/10	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean	8	6	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60171 16 hours ago	141-33792 141 days ago	0-1878 31 minutes
31768	Thmoas-Guan author:Thmoas-Guan	feat(Homology): `Ext` commute with ulift functor	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: #31697 - [ ] depends on: #31706 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra blocked-by-other-PR t-category-theory label:t-algebra$	554/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean	9	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60148 16 hours ago	139-31959 139 days ago	0-2065 34 minutes
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$	775/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean	11	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60147 16 hours ago	137-15705 137 days ago	0-8108 2 hours
33894	vihdzp author:vihdzp	chore: move `Archimedean` to a new `Defs` file	I've also moved the most basic theorems (`exists_nat_lt`, etc.) to this file. This greatly decreases the imports needed to use these classes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	119/66	Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Defs.lean,Mathlib/Data/Real/Archimedean.lean	4	5	['dagurtomas', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	0-57151 15 hours ago	0-57400 15 hours ago	10-2068 10 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	384/0	Mathlib.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/DeltaSystem.lean,Mathlib/SetTheory/Cardinal/Pigeonhole.lean,docs/references.bib	6	6	['github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	0-53942 14 hours ago	27-86091 27 days ago	15-9493 15 days
37353	SnirBroshi author:SnirBroshi	feat(Order/WellFounded): characterize `WellFoundedLT` and `IsWellOrder` in terms of nonempty sets	--- Both of these use the existing characterization of `WellFounded`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	19/0	Mathlib/Order/WellFounded.lean	1	5	['Komyyy', 'github-actions']	Komyyy assignee:Komyyy	0-52579 14 hours ago	0-52579 14 hours ago	7-11904 7 days
37391	grunweg author:grunweg	fix(create_deprecated_modules): fix the build again	The code needed updating to the new String API; it failed to build before this PR. This also removes uses of deprecated String API. A future PR will add CI to ensure this script builds fine. (Future future: can we test that we tested all .lean scripts? Or have a test which builds all .lean files in scripts?) --- We need to annotate a type as `Char` now, perhaps because the default instances (from a `Char` to a `Slice.Pattern`) don't work out as well any more. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI maintainer-merge	22/20	scripts/create_deprecated_modules.lean	1	24	['adomani', 'github-actions', 'grunweg']	adomani assignee:adomani	0-52392 14 hours ago	2-16849 2 days ago	4-61193 4 days
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/)		159/0	Mathlib/CategoryTheory/Abelian/Injective/Dimension.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-52301 14 hours ago	0-52324 14 hours ago	7-1355 7 days
37355	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): refactor `smulShortComplex`	Use `LinearMap.lsmul` for the `f` of `ModuleCat.smulShortComplex`, also providing new APIs for it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	40/20	Mathlib/RingTheory/Regular/Category.lean	1	1	['github-actions']	nobody	0-52240 14 hours ago	7-62055 7 days ago	7-62045 7 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 --- - [ ] depends on: #37355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-ring-theory blocked-by-other-PR	222/32	Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	2	58	['Thmoas-Guan', 'alreadydone', 'chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	0-51978 14 hours ago	7-57673 7 days ago	94-80616 94 days
37686	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Ring/Defs): `CharZero` instance for nontrivial ordered rings	Previously it is only added for strictly ordered semirings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor label:t-algebra$	2/0	Mathlib/Algebra/Order/Ring/Defs.lean	1	2	['github-actions']	nobody	0-51325 14 hours ago	0-51404 14 hours ago	0-51394 14 hours
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 - [ ] 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$	613/32	Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	2	7	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-48557 13 hours ago	290-27664 290 days ago	0-152 2 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$	1004/32	Mathlib.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	4	9	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-48540 13 hours ago	290-27665 290 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$	898/32	Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	2	7	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-48528 13 hours ago	290-29610 290 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$	824/32	Mathlib.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	4	9	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-48495 13 hours ago	290-29488 290 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$	1691/32	Mathlib.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	5	16	['Thmoas-Guan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-48048 13 hours ago	290-29332 290 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 large-import blocked-by-other-PR	1908/32	Mathlib.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Polynomial.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	6	14	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	0-47912 13 hours ago	46-63815 46 days ago	3-48641 3 days
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$	2086/32	Mathlib.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	6	16	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-47611 13 hours ago	289-43544 289 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$	2261/32	Mathlib.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/CohenMacaulay/Unmixed.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	7	14	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-47439 13 hours ago	270-37339 270 days ago	0-229 3 minutes
37601	loefflerd author:loefflerd	feat(Topology/Algebra/Group/Matrix): refactor; continuity of maps on GL(n) and SL(n)	Show that the map `GL n R → GL n S` induced by a ring morphism `f : R → S` is continuous if `f` is (and similarly if `f` is inducing, embedding, or closed embedding). Also refactor and clean up `Topology/Algebra/Group/Matrix.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	131/37	Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/Matrix.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/Maps/Basic.lean	7	2	['github-actions', 'mathlib-merge-conflicts']	nobody	0-47347 13 hours ago	0-47370 13 hours ago	1-49086 1 day
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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-algebra label:t-algebra$	2382/186	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean	16	12	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-46753 12 hours ago	207-66852 207 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 large-import t-algebra label:t-algebra$	2841/186	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	18	13	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-46637 12 hours ago	207-21832 207 days ago	0-1929 32 minutes
32058	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): category version Baer criterion	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. --- - [ ] depends on: #36980 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory label:t-algebra$	118/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean	2	23	['Thmoas-Guan', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	0-46615 12 hours ago	2-27388 2 days ago	15-39700 15 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	242/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/RingTheory/GlobalDimension.lean	3	17	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	0-46596 12 hours ago	98-41279 98 days ago	27-39406 27 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 large-import t-algebra label:t-algebra$	3115/186	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	20	17	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-46429 12 hours ago	207-64609 207 days ago	0-2082 34 minutes
36720	YanYablonovskiy author:YanYablonovskiy	feat(Order): `OrderType.lift` and more order type API	Adding the universe lifting operation to `OrderType` , addresses a 'TODO' . --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor maintainer-merge	41/2	Mathlib/Order/Types/Defs.lean	1	25	['YaelDillies', 'YanYablonovskiy', 'github-actions', 'vihdzp']	bryangingechen assignee:bryangingechen	0-44877 12 hours ago	14-39408 14 days ago	16-2954 16 days
37462	grunweg author:grunweg	chore: golf using gcongr	Auditing occurrences of `mul_le_mul_of_nonneg_{left,right}`, `rpow_le_rpow` and `add_le_add` --- not exhaustive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		181/164	Archive/Imo/Imo1988Q6.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumIntegralComparisons.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Covering/DensityTheorem.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean	68	15	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-radar']	nobody	0-44047 12 hours ago	1-12298 1 day ago	5-36234 5 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	329/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/RingTheory/GlobalDimension.lean	3	17	['Thmoas-Guan', 'github-actions', 'jcommelin', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-43780 12 hours ago	132-39579 132 days ago	1-68813 1 day
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 say 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. It can also be used to simplify the proof of [MeasureTheory.hausdorffMeasure_pi_real](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Measure/Hausdorff.html#MeasureTheory.hausdorffMeasure_pi_real). These will be done in another PR. --- - [ ] depends on: #37311 - [ ] depends on: #37312 - [x] depends on: #37313 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	280/6	Mathlib.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/UniformlyDistributed.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/MetricSpace/Bounded.lean	6	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-43766 12 hours ago	9-30812 9 days ago	0-524 8 minutes
36979	Komyyy author:Komyyy	feat: `↑(Nat.log m n) = Ordinal.log ↑m ↑n`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	12/3	Mathlib/SetTheory/Ordinal/Exponential.lean	1	22	['Komyyy', 'YaelDillies', 'github-actions', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	0-43598 12 hours ago	13-30257 13 days ago	14-82909 14 days
37689	WenrongZou author:WenrongZou	feat(MvPowerSeries): MvPowerSeries.C is injective	--- Add a easy lemma: `MvPowerSeries.C` is injective. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	9/4	Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Basic.lean	2	1	['github-actions']	nobody	0-43323 12 hours ago	0-43393 12 hours ago	0-43383 12 hours
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 large-import t-algebra label:t-algebra$	3325/186	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean	22	19	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-42927 11 hours ago	202-52722 202 days ago	0-632 10 minutes
37602	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): arithmetic subgroups act properly discontinuously	Arithmetic subgroups (subgroups of GL(2, R) commensurable with SL(2, Z)) act properly discontinuously on the upper half-plane. --- - [ ] depends on: #37601	t-topology large-import blocked-by-other-PR	259/41	Mathlib.lean,Mathlib/Analysis/Complex/UpperHalfPlane/ProperAction.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ModularForms/ArithmeticSubgroups.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Group/DiscontinuousSubgroup.lean,Mathlib/Topology/Algebra/Group/Matrix.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/Maps/Basic.lean	11	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-42088 11 hours ago	3-12687 3 days ago	0-1364 22 minutes
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	0-41161 11 hours ago	0-42842 11 hours ago	0-42832 11 hours
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 large-import t-ring-theory	3492/186	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Syzygy.lean	24	20	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-40550 11 hours ago	202-41740 202 days ago	0-2475 41 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import t-ring-theory	2514/186	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean	18	15	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-40385 11 hours ago	199-57934 199 days ago	0-80 1 minute
37591	grunweg author:grunweg	feat: also use assumption to discharge gcongr side goals	An experiment to see the effect it has on current mathlib. --- - [ ] depends on: #37462 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR	210/201	Archive/Imo/Imo1988Q6.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumIntegralComparisons.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Covering/DensityTheorem.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Harmonic/ZetaAsymp.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/NumberField/House.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/Process/HittingTime.lean,Mathlib/Tactic/GCongr.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/UnitInterval.lean	83	4	['github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues']	nobody	0-40375 11 hours ago	3-32852 3 days ago	0-3 3 seconds
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 large-import t-ring-theory	3992/186	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/AuslanderBuchsbaumSerre.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/Localization.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Localization.lean	25	20	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-40373 11 hours ago	199-43365 199 days ago	0-458 7 minutes
37279	imalinowskip author:imalinowskip	feat(Probability): multivariate CLT (and Cramèr-Wold)	Depends on #36208 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	672/0	Mathlib.lean,Mathlib/Probability/CramerWold.lean,Mathlib/Probability/MultivariateCentralLimitTheorem.lean	3	3	['github-actions', 'mathlib-merge-conflicts']	RemyDegenne assignee:RemyDegenne	0-38770 10 hours ago	3-4736 3 days ago	3-4726 3 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	862/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/RingTheory/Gorenstein/Defs.lean	12	9	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-36483 10 hours ago	136-32643 136 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	964/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Gorenstein/Localization.lean	13	11	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-36344 10 hours ago	133-43439 133 days ago	0-862 14 minutes
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	2303/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/Gorenstein/Polynomial.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	19	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-35953 9 hours ago	98-23999 98 days ago	0-107 1 minute
36621	quantumsnow author:quantumsnow	feat: add the category of topological pairs	This is needed for the Eilenberg-Steenrod axioms for a homology theory. --- - [ ] depends on: #37540 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology new-contributor blocked-by-other-PR	211/0	Mathlib.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Category/TopPair.lean	3	83	['chrisflav', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-dependent-issues', 'quantumsnow', 'vlad902']	dagurtomas assignee:dagurtomas	0-34243 9 hours ago	2-22936 2 days ago	6-58152 6 days
37692	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): more API for the boundary	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	168/11	Mathlib/AlgebraicTopology/SimplicialSet/Boundary.lean,Mathlib/AlgebraicTopology/SimplicialSet/Dimension.lean,Mathlib/AlgebraicTopology/SimplicialSet/Finite.lean,Mathlib/AlgebraicTopology/SimplicialSet/KanComplex/MulStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean	5	1	['github-actions']	nobody	0-32276 8 hours ago	0-32314 8 hours ago	0-32368 8 hours
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.		310/84	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/Nat.lean,lake-manifest.json,lakefile.lean,lean-toolchain	23	4	['github-actions', 'mattrobball', 'riccardobrasca']	nobody	0-29591 8 hours ago	unknown	0-0 0 seconds
37570	pitmonticone author:pitmonticone	feat(Topology/Instances/AddCircle): add Ioc analogues of lift and equiv lemmas	Add AddCircle lemmas: - `liftIoc_eq_liftIco_of_ne`: the Ioc and Ico lifts agree away from the basepoint - `coe_eq_coe_iff_of_mem_Ioc`: Ioc analogue of `coe_eq_coe_iff_of_mem_Ico` - `eq_coe_Ioc`: Ioc analogue of `eq_coe_Ico` - `coe_equivIoc`: Ioc analogue of `coe_equivIco` - `equivIoc_coe_of_mem`: if `y ∈ Ioc a (a + p)`, then `equivIoc p a y = y` Upstreamed from the [Carleson](https://github.com/fpvandoorn/carleson) project. Co-authored-by: James Sundstrom Co-authored-by: Leo Diedering <129694072+ldiedering@users.noreply.github.com> ---	carleson t-topology awaiting-author	32/0	Mathlib/Topology/Instances/AddCircle/Defs.lean	1	11	['github-actions', 'loefflerd', 'pitmonticone']	loefflerd assignee:loefflerd	0-28703 7 hours ago	0-28703 7 hours ago	3-34806 3 days
37115	tb65536 author:tb65536	feat(RingTheory/Flat/Basic): `Submodule.toBaseChange` as a `LinearEquiv`	If the extensions of rings is flat, then `Submodule.toBaseChange` becomes a `LinearEquiv`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra maintainer-merge awaiting-CI label:t-algebra$	21/0	Mathlib/RingTheory/Flat/Basic.lean	1	10	['faenuccio', 'github-actions', 'robin-carlier', 'tb65536']	faenuccio assignee:faenuccio	0-27192 7 hours ago	0-28776 7 hours ago	9-61055 9 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 --- [![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/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean	6	17	['YaelDillies', 'github-actions', 'joneugster', 'khwilson']	YaelDillies assignee:YaelDillies	0-26525 7 hours ago	2-44880 2 days ago	36-16958 36 days
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. Let's see how badly this fails! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-linter	77/51	Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo2019Q4.lean,Archive/OxfordInvariants/Summer2021/Week3P1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/InnerProductSpace/Convex.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/ArithmeticGeometricMean.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Extremal/RuzsaSzemeredi.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Divisible.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/InformationTheory/Coding/KraftMcMillan.lean,Mathlib/LinearAlgebra/AffineSpace/Centroid.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Measure/IntegralCharFun.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Harmonic/EulerMascheroni.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/ZetaValues.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Nilpotent/Exp.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Topology/UrysohnsLemma.lean	44	3	['github-actions', 'grunweg']	nobody	0-26246 7 hours ago	1-10799 1 day ago	0-2 2 seconds
35970	adrianmartir author:adrianmartir	feat(CategoryTheory/Profunctor): Add profunctors and a basic API for them	This adds a definition of a profunctor and the definition of a natural transformation between two profunctors. Profunctors are defined as a structure, as suggested by @adamtopaz [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Operads.20Formalization/with/566160316). Using this as a base, I wrote a basic API for profunctors. This will be needed for a future formalization of operads. A lot of the API was first drafted by @Aristotle-Harmonic. Co-authored-by: Aristotle (Harmonic) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor awaiting-author	185/0	Mathlib.lean,Mathlib/CategoryTheory/Profunctor.lean	2	17	['adrianmartir', 'dagurtomas', 'emilyriehl', 'github-actions', 'joelriou']	nobody	0-25142 6 hours ago	31-82824 31 days ago	3-4971 3 days
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	650/0	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	0-24564 6 hours ago	5-16888 5 days ago	0-13581 3 hours
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	15/17	Mathlib/GroupTheory/Complement.lean	1	2	['github-actions']	nobody	0-23240 6 hours ago	0-22999 6 hours ago	0-23843 6 hours
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: #31046 - [ ] depends on: #32058 - [ ] depends on: #36817 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-ring-theory	856/10	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean	9	7	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-22878 6 hours ago	132-23636 132 days ago	0-1905 31 minutes
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	4649/42	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	24	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-22788 6 hours ago	98-23087 98 days ago	0-264 4 minutes
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	4833/42	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	24	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-22723 6 hours ago	25-27522 25 days ago	0-2167 36 minutes
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	5782/42	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	25	8	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-22578 6 hours ago	98-22864 98 days ago	0-126 2 minutes
37298	artie2000 author:artie2000	refactor(Algebra/Order): unbundle group and ring cone	* Unbundle `GroupCone` and `RingCone` using `Submonoid.IsMulPointed` --- [![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	['artie2000', 'github-actions']	nobody	0-21854 6 hours ago	8-10117 8 days ago	8-10662 8 days
37111	tannerduve author:tannerduve	feat(Computability): add Nat.PrimrecIn and PrimrecIn	## Summary - Add `Nat.PrimrecIn`: primitive recursive functions relative to a set of oracles - Add `PrimrecIn`: lifts `Nat.PrimrecIn` to `Primcodable` types Split out from #34937 as requested in review. - [ ] depends on: #37061	t-computability new-contributor	24/1	Mathlib/Computability/RecursiveIn.lean,Mathlib/Computability/TuringDegree.lean	2	6	['Komyyy', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	0-21676 6 hours ago	0-21619 6 hours ago	0-6416 1 hour
36889	KryptosAI author:KryptosAI	feat(LinearAlgebra/Matrix/MoorePenrose): define the Moore-Penrose pseudo-inverse	Defines `IsMoorePenroseInverse` and constructs the Moore-Penrose pseudo-inverse for matrices over `RCLike` fields. Closes #24787. `Defs.lean` defines the predicate using the heterogeneous four-condition characterization from the issue, plus uniqueness for semigroups with `StarMul`. `Basic.lean` constructs the inverse via orthogonal projection and `ker(f)ᗮ ≃ₗ range(f)`, then proves: ```lean theorem exists_isMoorePenroseInverse (A : Matrix m n 𝕜) : ∃ (As : Matrix n m 𝕜), IsMoorePenroseInverse A As def moorePenroseInverse (A : Matrix m n 𝕜) : Matrix n m 𝕜 lemma moorePenroseInverse_conjTranspose : moorePenroseInverse (Aᴴ) = (moorePenroseInverse A)ᴴ lemma moorePenroseInverse_eq_nonsing_inv (hA : IsUnit A) : moorePenroseInverse A = A⁻¹ ``` ### AI disclosure - Gemini 2.5 Pro: proof planning, initial code, edits - Claude Code (Opus 4.6): debugging, compilation, type-checking against mathlib4 I reviewed and directed all changes. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor LLM-generated label:t-algebra$	402/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/MoorePenrose/Basic.lean,Mathlib/LinearAlgebra/Matrix/MoorePenrose/Defs.lean	3	29	['KryptosAI', 'eric-wieser', 'github-actions', 'themathqueen', 'vihdzp']	ocfnash assignee:ocfnash	0-21398 5 hours ago	3-66109 3 days ago	15-12773 15 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 large-import	286/38	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	7	['github-actions', 'mathlib-merge-conflicts']	nobody	0-21116 5 hours ago	95-12913 95 days ago	0-1 1 second
37691	arnoudvanderleer author:arnoudvanderleer	feat(CategoryTheory/Enriched): construct the (graded) natural transformation object	Constructs the natural transformations object as an equalizer between two products of objects in `V` and shows that its global elements (the morphisms from `𝟙_ V`) are equivalent to the terms of `EnrichedNatTrans F G`. Similarly, defines the graded natural transformations object and shows that for all `A : V`, the morphisms `A ⟶ gradedNatTransObj F G` are equivalent to `A`-graded natural transformations (where we lift `A` to the center using `(β_ X A).symm` as the half braiding). --- I am still not satisfied with a couple of things. I annotated these in the code, but will list them here as well: * 444: Can we remove the noncomputable annotation on the section by making a choice of limits? * 450: Is there a way to capture the three assumptions `[HasProducts.{max u₁ w} V] [HasProducts.{u₁} V] [HasEqualizers V]` into one assumption? Or maybe two assumptions? Is there a way to derive `HasProducts.{u₁}` from `HasProducts.{max u₁ w}`? * 500: Without further assumptions on `V`, we probably cannot generalize the result about graded natural transformations to all `A : Center V`. Right? * 589: Is the pre-existing definition of `EnrichedNatTrans` indeed equivalent to a `𝟙_ V`-graded natural transformation? Because I was not able to prove that. If it is equivalent, it may be nice to actually prove that it is. I will remove the annotations after we have cleared them up. And I know I still have to expand the header at the top of the file. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory new-contributor	293/3	Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Monoidal/Center.lean	2	3	['github-actions']	nobody	0-20995 5 hours ago	0-20656 5 hours ago	0-473 7 minutes
37696	loefflerd author:loefflerd	refactor(OnePoint/ProjectiveLine): use Pi instead of Prod	At the moment `OnePoint.equivProjectivization` identifies the one-point compactification of `K` with the projective space on `K x K`. This is slightly inconvenient since most of mathlib's linear algebra prefers `Fin n -> K`. This PR uses the Pi type instead of the product, and also adds an easy lemma about fixed points (which will be used later in studying fixed points of Moebius transformations). --- There is a non-trivial import increase in `Projectivization.Action` but that file is not imported anywhere else except in `OnePoint.ProjectiveLine` which already imports almost all of those files, so there is no significant downstream effect. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra large-import label:t-algebra$	74/38	Mathlib/LinearAlgebra/Projectivization/Action.lean,Mathlib/Topology/Compactification/OnePoint/ProjectiveLine.lean	2	1	['github-actions']	nobody	0-20992 5 hours ago	0-22392 6 hours ago	0-22382 6 hours
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	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	86	['arnoudvanderleer', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'robin-carlier']	robin-carlier assignee:robin-carlier	0-20991 5 hours ago	0-20941 5 hours ago	10-39489 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	39/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean	1	1	['github-actions']	nobody	0-20719 5 hours ago	0-20789 5 hours ago	0-20779 5 hours
37698	Qulinecier author:Qulinecier	feat: add TendstoInDistribution.continuousOn_comp_prodMk_of_tendstoInMeasure_const	This PR adds `TendstoInDistribution.continuousOn_comp_prodMk_of_tendstoInMeasure_const`, a generalization of the existing `TendstoInDistribution.continuous_comp_prodMk_of_tendstoInMeasure_const` (Slutsky's theorem) to functions that are only continuous on a closed subset `s` of the domain, rather than everywhere. This is useful when `g` is only well-behaved on a proper closed subset, such as division (away from zero) or logarithm (on the positive reals), where the previous version requiring global continuity was not applicable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	108/6	Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean	2	2	['github-actions']	nobody	0-20465 5 hours ago	0-20528 5 hours ago	0-20518 5 hours
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/)		63/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean	2	5	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-20457 5 hours ago	45-47680 45 days ago	0-5 5 seconds
35675	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Smooth): some lemmas about formally smooth	This PR mainly formalized the result [[Stacks 031L](https://stacks.math.columbia.edu/tag/031L)] This is a preliminary of Cohen Structure Theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	290/0	Mathlib.lean,Mathlib/RingTheory/Smooth/Quotient.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	3	29	['Thmoas-Guan', 'github-actions', 'jcommelin', 'riccardobrasca']	erdOne, mattrobball, riccardobrasca assignee:riccardobrasca assignee:erdOne assignee:mattrobball	0-20100 5 hours ago	4-20727 4 days ago	39-12406 39 days
36102	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	475/0	Mathlib.lean,Mathlib/RingTheory/Flat/Extension.lean	2	2	['github-actions', 'mathlib-bors']	nobody	0-20071 5 hours ago	33-54364 33 days ago	0-6 6 seconds
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	t-number-theory	645/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	51	['github-actions', 'jcommelin', 'kim-em', 'metakunt', 'qawbecrdtey', 'tb65536', 'vihdzp']	tb65536 assignee:tb65536	0-19967 5 hours ago	8-50693 8 days ago	38-43444 38 days
37635	vasnesterov author:vasnesterov	chore(Analysis/Analytic): tag `ofScalars_norm_eq_mul` with `simp`	Tag `ofScalars_norm_eq_mul` with `simp` and remove `@[simp]` from `ofScalars_norm` as it now can be proven using `ofScalars_norm_eq_mul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis easy	2/2	Mathlib/Analysis/Analytic/OfScalars.lean	1	6	['github-actions', 'leanprover-radar', 'themathqueen', 'vasnesterov']	nobody	0-19895 5 hours ago	2-12644 2 days ago	2-12634 2 days
37000	Qulinecier author:Qulinecier	feat: generalize rank_submatrix_le to arbitrary column maps	This PR generalizes `rank_submatrix_le` to allow an arbitrary function on columns instead of requiring an `Equiv`. The previous version required `e : m₀ ≃ m` and `[Fintype m]`, while this version only requires `c : n₀ → n` and `[Fintype n₀]`. The previous version can be recovered as a special case of the new one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra new-contributor maintainer-merge label:t-algebra$	16/6	Mathlib/LinearAlgebra/Matrix/Rank.lean	1	8	['Qulinecier', 'dagurtomas', 'github-actions', 'themathqueen']	dagurtomas assignee:dagurtomas	0-19057 5 hours ago	0-19677 5 hours ago	10-51750 10 days
35852	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): existence of coefficient ring	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 --- - [ ] depends on: #28683 - [ ] depends on: #35675 - [ ] depends on: #36102 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	2081/221	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.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/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/Smooth/Quotient.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	17	6	['github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-18888 5 hours ago	38-42151 38 days ago	0-10 10 seconds
37669	vihdzp author:vihdzp	chore: deprecate `Ordinal.bsup`	In favor of simply writing `⨆ i : Iio a, f i`. See #17033. --- - [x] depends on: #37262 - [x] depends on: #37667 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	53/11	Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/Topology.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-18822 5 hours ago	0-18845 5 hours ago	0-31601 8 hours
35560	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Cohen Structure Theorem	Formalization of Cohen structure theorem following https://stacks.math.columbia.edu/tag/0323 Co-authored-by: @BryceT233 --- - [ ] depends on: #28683 - [ ] depends on: #35561 - [ ] depends on: #35852 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	2312/221	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.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/AssociatedPrime/Localization.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/Ideal/Operations.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean,Mathlib/RingTheory/Smooth/Quotient.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	18	7	['BryceT233', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-18434 5 hours ago	45-47903 45 days ago	0-8 8 seconds
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	235/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	66	['b-mehta', 'edwin1729', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	urkud assignee:urkud	0-18406 5 hours ago	30-24666 30 days ago	36-77373 36 days
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	0-17525 4 hours ago	0-17532 4 hours ago	12-13791 12 days
37699	vihdzp author:vihdzp	chore: deprecate `Ordinal.familyOfBFamily`	This bespoke API existed only as an auxiliary definition for `Ordinal.bsup` and the other ordinal-indexed suprema. But now that these have been systematically deprecated, in favor of using `sSup` and `iSup` as we do elsewhere, there's no need for this API to exist. See #17033. --- - [ ] depends on: #37669 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR	97/35	Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/Topology.lean	2	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-17496 4 hours ago	0-17497 4 hours ago	0-189 3 minutes
31046	Thmoas-Guan author:Thmoas-Guan	feat(Homology) : compatibility of map between `Ext`	In this PR, we proved the compatibility of map between `Ext` induced by exact functor with 1: `mk_0` 2: `comp` 3: `extClass` --- - [x] depends on: #31707 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	231/10	Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean	6	47	['Thmoas-Guan', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	eric-wieser assignee:eric-wieser	0-17459 4 hours ago	0-17459 4 hours ago	49-55836 49 days
31644	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): projective dimension of quotient regular sequence	In this PR, we proved that for finitely generated module over Noetherian local ring, quotient by regular sequence increase the projective dimension by exactly its length. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	193/0	Mathlib.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean	2	28	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	0-17282 4 hours ago	0-17284 4 hours ago	4-47981 4 days
37022	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Cofinality): cof (a * b) = cof b	We also tag `isSuccLimit_omega0` as simp, so that simp can solve goals like `(ω_ ω).cof = ω` or `cof (x * ω) = ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	12/3	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	3	4	['SnirBroshi', 'github-actions', 'mathlib-merge-conflicts', 'vihdzp']	nobody	0-17185 4 hours ago	12-40547 12 days ago	14-43407 14 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	20/3	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	3	['TJHeeringa', 'github-actions']	nobody	0-16519 4 hours ago	unknown	0-0 0 seconds
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	6097/253	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/CategoryTheory/Abelian/Ext.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/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/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/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/PowerSeries.lean,Mathlib/RingTheory/Smooth/Quotient.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	32	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-16471 4 hours ago	59-24051 59 days ago	0-12 12 seconds
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. --- - [ ] 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 blocked-by-other-PR label:t-algebra$	1107/3	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Adjunction.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctorMonoidal.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Point.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/Functor.lean,Mathlib/CategoryTheory/Monoidal/Preadditive.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Sites/CoversTop.lean,Mathlib/CategoryTheory/Sites/IsSheafFor.lean	19	8	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-16358 4 hours ago	40-9564 40 days ago	0-1 1 second
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	35/0	Mathlib/Combinatorics/SimpleGraph/Maps.lean	1	1	['github-actions']	nobody	0-16234 4 hours ago	0-16306 4 hours ago	0-16296 4 hours
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	11/2	Mathlib/Analysis/Fourier/FourierTransformDeriv.lean	1	2	['github-actions']	nobody	0-15992 4 hours ago	0-16073 4 hours ago	0-7 7 seconds
37304	vihdzp author:vihdzp	feat: if `s ∪ t` is directed then one of `s` or `t` is	--- Co-authored-by: Kamille Bidan <25210160030@m.fudan.edu.cn> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	57/0	Mathlib/Order/Bounds/Basic.lean	1	12	['NoneMore', 'b-mehta', 'fpvandoorn', 'github-actions', 'mathlib-bors', 'plp127', 'vihdzp']	nobody	0-15515 4 hours ago	0-15599 4 hours ago	3-22989 3 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) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-order	64/49	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	3	['github-actions', 'vihdzp']	nobody	0-15242 4 hours ago	0-68757 19 hours ago	0-68823 19 hours
37662	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): the adjunction between `colimitFunctor` and `constFunctor`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory label:t-algebra$	142/0	Mathlib/Algebra/Category/ModuleCat/Presheaf/ColimitFunctor.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	0-14149 3 hours ago	1-32075 1 day ago	1-32192 1 day
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	219/3	Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Order/OmegaCompletePartialOrder.lean,Mathlib/Order/ScottContinuity.lean,Mathlib/Topology/Constructions/SumProd.lean	6	50	['Vierkantor', 'YaelDillies', 'YellPika', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'vihdzp']	YaelDillies and pechersky assignee:pechersky assignee:YaelDillies	0-14061 3 hours ago	3-20460 3 days ago	52-60444 52 days
34093	YellPika author:YellPika	feat(Order/OmegaCompletePartialOrder): add `OmegaCompletePartialOrder` instance for `Option` with basic `ωScottContinuous` lemmas	--- - [x] depends on: #33941 - [x] depends on: #37258 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order new-contributor	298/0	Mathlib.lean,Mathlib/Data/Option/Order.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/OmegaCompletePartialOrder.lean	4	8	['Komyyy', 'YellPika', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	Komyyy assignee:Komyyy	0-14041 3 hours ago	1-45859 1 day ago	57-41565 57 days
34227	stepan2698-cpu author:stepan2698-cpu	feat(Combinatorics/Schnirelmann): if sum of densities is at least one, the sumset covers the naturals	Proves an outstanding TODO item from Mathlib.Combinatorics.Schnirelmann : shows that if the sum of two densities is at least one, the sumset covers the positive naturals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics new-contributor awaiting-author	37/1	Mathlib/Combinatorics/Schnirelmann.lean	1	20	['FLDutchmann', 'YaelDillies', 'YanYablonovskiy', 'github-actions', 'grunweg', 'kbuzzard', 'stepan2698-cpu']	b-mehta assignee:b-mehta	0-13376 3 hours ago	1-18549 1 day ago	73-70217 73 days
28684	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): definition of regular ring	In this PR, we define regular ring as every localization is regular local ring, and proved polynomial over regular ring is regular. --- - [x] depends on: #28682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	63/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean	2	36	['Thmoas-Guan', 'artie2000', 'erdOne', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	0-13246 3 hours ago	0-61971 17 hours ago	5-2374 5 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	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	15	['Raph-DG', 'dagurtomas', 'erdOne', 'github-actions', 'joelriou', 'mathlib-merge-conflicts', 'riccardobrasca']	robin-carlier assignee:robin-carlier	0-12619 3 hours ago	0-12619 3 hours ago	4-49805 4 days
37569	j-loreaux author:j-loreaux	feat: the Fuglede–Putnam–Rosenblum theorem for C⋆-algebras	Let `A` be a C⋆-algebra, and let `a b x : A`. The Fuglede–Putnam–Rosenblum theorem states that if `a` and `b` are normal and `x` intertwines `a` and `b` (i.e., `SemiconjBy x a b`). Then `x` also intertwines `star a` and `star b`. Fuglede's original result was for `a = b` (i.e., if `x` commutes with `a`, then `x` also commutes with `star a`), and Putnam extended it to intertwining elements. Rosenblum later gave the elementary proof formalized here using Liouville's theorem. A version of the Fuglede–Putnam theorem also holds for unbounded operators, but it necessitates a different proof technique and holds in different generality than the one given here. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis maintainer-merge	323/13	Mathlib.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Units.lean,Mathlib/Analysis/CStarAlgebra/Fuglede.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,docs/references.bib	8	21	['github-actions', 'j-loreaux', 'loefflerd']	loefflerd assignee:loefflerd	0-12044 3 hours ago	0-12103 3 hours ago	3-67842 3 days
37704	joelriou author:joelriou	feat(AlgebraicTopology): the semi-simplex category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	99/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/SemiSimplexCategory.lean	2	1	['github-actions']	nobody	0-11878 3 hours ago	0-11932 3 hours ago	0-12065 3 hours
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	170/1	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/Topology/Sheaves/SheafCondition/Sites.lean	3	7	['Brian-Nugent', 'github-actions', 'joelriou']	adamtopaz assignee:adamtopaz	0-11368 3 hours ago	0-11425 3 hours ago	6-64058 6 days
36507	BryceT233 author:BryceT233	feat(RingTheory/MvPowerSeries): introduces various equivalences for `MvPowerSeries`	This PR introduces 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/) - [ ] depends on: #35329 - [x] depends on: #36506	t-ring-theory	635/0	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/Equiv.lean	2	6	['BryceT233', 'WenrongZou', 'eric-wieser', 'github-actions', 'mathlib-dependent-issues']	nobody	0-11236 3 hours ago	25-69802 25 days ago	0-149 2 minutes
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	188/2	Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Monoid.lean	4	9	['CoolRmal', 'Deep0Thinking', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'sgouezel']	urkud assignee:urkud	0-11151 3 hours ago	0-32777 9 hours ago	6-41371 6 days
37688	grunweg author:grunweg	feat: try using grind as gcongr discharger	Let's see what benchmarks say! --- - [ ] depends on: #37591 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR awaiting-CI	266/291	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2020Q2.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/ParametricIntegral.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/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Order.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumIntegralComparisons.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Basic.lean,Mathlib/GroupTheory/Archimedean.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Covering/DensityTheorem.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	122	10	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues']	nobody	0-10672 2 hours ago	0-44102 12 hours ago	0-7 7 seconds
37579	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph/Girth): add lemmas about the length of a walk being equal to the girth	--- - [ ] depends on: #37561 - [ ] depends on: #37505 - [ ] 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	89/0	Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/List/Basic.lean	3	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-10374 2 hours ago	3-78155 3 days ago	0-678 11 minutes
37562	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add several lemmas about when `Walk.bypass` and `Walk.cycleBypass` do nothing	--- - [ ] depends on: #37505 - [ ] depends on: #37561 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR t-combinatorics	61/0	Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Data/List/Basic.lean	2	3	['SnirBroshi', 'github-actions', 'mathlib-dependent-issues']	nobody	0-10343 2 hours ago	4-7773 4 days ago	0-504 8 minutes
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 label:t-algebra$	111/1	Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean	1	18	['eric-wieser', 'github-actions', 'slavanaprienko', 'wwylele']	nobody	0-9821 2 hours ago	1-57819 1 day ago	2-73297 2 days
36993	Jun2M author:Jun2M	feat(Order/Partition): `IsRepFun` predicate for `Partition`	This PR adds Representative functions: Defines `Partition.IsRepFun`, a predicate characterizing when a function maps each element to a representative in its partial equivalence class and `id` on elements outside the support. Co-authored-by: Peter Nelson --- - [x] depends on: #36574 - [x] depends on: #36991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	118/0	Mathlib/Order/Partition/Basic.lean	1	4	['Jun2M', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-9632 2 hours ago	1-15423 1 day ago	1-16850 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) - [ ] depends on: #37649 - [ ] depends on: #37640 - [ ] 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	217/0	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Finset/Preimage.lean,Mathlib/Data/Set/Function.lean,Mathlib/Order/RelIso/Basic.lean	5	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-9615 2 hours ago	unknown	0-0 0 seconds
37693	Maldooor author:Maldooor	chore(Analysis/InnerProductSpace/Reproducing): clarify TODO	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-analysis	3/3	Mathlib/Analysis/InnerProductSpace/Reproducing.lean	1	2	['YaelDillies', 'github-actions']	nobody	0-8738 2 hours ago	0-29854 8 hours ago	0-29844 8 hours
37660	eliasjudin author:eliasjudin	feat(Algebra/MvPolynomial): Hasse derivatives, mvChoose, and polynomial equivalences	### Motivation Introduce multivariate Hasse derivatives for `MvPolynomial`, built from coordinatewise binomial coefficients `mvChoose` (`Mathlib.Algebra.MvPolynomial.MvChoose`), and wire one-variable bridges (`uniqueAlgEquiv`, `finOneAlgEquiv`, `finSuccEquiv`) to the existing univariate `Polynomial.hasseDeriv` API. ### Main changes - `Mathlib.Algebra.MvPolynomial.MvChoose`: `MvPolynomial.mvChoose` and lemmas (`mvChoose_mul`, `mvChoose_add`, rename/map-domain identities, etc.). - `Mathlib.Algebra.MvPolynomial.HasseDeriv`: `MvPolynomial.hasseDeriv`, coefficient formula, composition and Leibniz rules, naturality under `rename`, compatibility with `finSuccEquiv` / `finOneAlgEquiv` vs `Polynomial.hasseDeriv`, and `totalDegree` bounds. - `Mathlib.RingTheory.MvPolynomial.HasseDeriv`: interaction with homogeneous polynomials and homogeneous components. - `Mathlib.Algebra.MvPolynomial.Equiv`: `uniqueAlgEquiv` for `[Unique σ]` (with `pUnitAlgEquiv` as an abbreviation), `finOneAlgEquiv` with `@[simps! apply symm_apply]`, evaluation lemmas, and `Polynomial.toMvPolynomial` updated via `Fin 1`. - `Mathlib.lean`: `public import`s for the new modules (alphabetical). ### Breaking changes - `pUnitAlgEquiv` remains definitionally `uniqueAlgEquiv R PUnit`; definitional callers need no change. --- Co-authored-by: Aristotle (Harmonic)	new-contributor LLM-generated	1162/30	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/HasseDeriv.lean,Mathlib/Algebra/MvPolynomial/MvChoose.lean,Mathlib/RingTheory/MvPolynomial/HasseDeriv.lean	5	7	['eric-wieser', 'github-actions', 'mathlib-bors']	nobody	0-8323 2 hours ago	0-20939 5 hours ago	0-1537 25 minutes
37212	MoritzBeroRoos author:MoritzBeroRoos	perf: Test batteries linter against mathlib for performance	This branch exists to test the changes in batteries [here](https://github.com/leanprover-community/batteries/pull/1717) against mathlib.	dependency-bump new-contributor	4/4	lake-manifest.json,lakefile.lean	2	8	['MoritzBeroRoos', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	0-8034 2 hours ago	unknown	0-0 0 seconds
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	314/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Geometry/PlaneCurves.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,docs/references.bib	5	98	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'michael-novak-math', 'scholzhannah']	nobody	0-7462 2 hours ago	2-8405 2 days ago	12-40134 12 days
36926	vihdzp author:vihdzp	chore: golf `Cardinal.lt_power_cof`	We rewrite the proof so as to avoid working with unbundled relations, and golf it somewhat in the process. --- - [x] depends on: #36927 - [x] depends on: #36928 - [x] depends on: #36929 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order	21/22	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-7157 1 hour ago	6-49444 6 days ago	7-11621 7 days
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 I'm surprised that this has a [Wikipedia article](https://en.wikipedia.org/wiki/Fodor%27s_lemma) but isn't listed in the list of theorems. 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 large-import blocked-by-other-PR	304/8	Mathlib.lean,Mathlib/Order/Club.lean,Mathlib/Order/DirSupClosed.lean,Mathlib/Order/IsNormal.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	0-6189 1 hour ago	0-58171 16 hours ago	0-1337 22 minutes
37708	j-loreaux author:j-loreaux	feat: `norm_cast` attributes for `Unitization` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra easy label:t-algebra$	8/6	Mathlib/Algebra/Algebra/Unitization.lean	1	1	['github-actions']	nobody	0-5565 1 hour ago	0-5638 1 hour ago	0-5628 1 hour
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	1386/116	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/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	20	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-5365 1 hour ago	unknown	0-0 0 seconds
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	205/3	Mathlib.lean,Mathlib/NumberTheory/Chebyshev.lean,Mathlib/NumberTheory/PrimorialLowerBound.lean,Mathlib/NumberTheory/SmoothNumbers.lean	4	27	['MichaelStollBayreuth', 'Parcly-Taxel', 'XC0R', 'github-actions', 'wwylele']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-4624 1 hour ago	0-6216 1 hour ago	9-66844 9 days
36421	ROTARTSI82 author:ROTARTSI82	feat(RingTheory/IsAdjoinRoot): add mkOfAdjoinEqTop'	Alternative hypothesis to existing theorem: prove the result from a `Module.Free `hypothesis instead of `IsIntegrallyClosed`. If `α` generates `S` as an algebra, then `S` is given by adjoining a root of `minpoly R α`. --- Hello, we are the Algebraic Geometry group from the UW Math AI lab, and this is our first PR! This definition of `mkOfAdjoinEqTop'` generalizes the existing `mkOfAdjoinEqTop` and shows the result from `Module.Free` instead of `IsIntegrallyClosed`. It is used in future results that we would like to upstream at https://github.com/uw-math-ai/monogenic-extensions, which is a project to formalize lemmas 3.1 and 3.2 from https://arxiv.org/abs/2503.07846. AI Usage: Claude code and Aristotle were used to fill sorries and search mathlib for existing lemmas, and the code was then golfed by hand. Co-authored-by: George Peykanu Co-authored-by: Bryan Boehnke Co-authored-by: Bianca Viray <67076332+b-viray@users.noreply.github.com> --> [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor large-import t-ring-theory awaiting-author	47/0	Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/RingTheory/IsAdjoinRoot.lean	2	8	['ROTARTSI82', 'artie2000', 'b-viray', 'github-actions']	riccardobrasca assignee:riccardobrasca	0-4078 1 hour ago	0-83155 23 hours ago	26-74477 26 days
37297	mrdouglasny author:mrdouglasny	feat(Analysis/Matrix): Schur product theorem for Hadamard product	## Summary Prove the Schur product theorem (Schur 1911): the Hadamard (entrywise) product of positive definite matrices is positive definite. The proof reduces to positivity of the Kronecker product via a diagonal embedding. ### New declarations * `Matrix.conjTranspose_hadamard`: `(A ⊙ B)ᴴ = Aᴴ ⊙ Bᴴ` (for `CommMonoid` with `StarMul`) * `Matrix.IsHermitian.hadamard`: Hadamard product of Hermitian matrices is Hermitian (same generality) * `Matrix.PosDef.hadamard`: Hadamard product of positive definite matrices is positive definite (for `RCLike` scalars, covering both `ℝ` and `ℂ`) ### Context This result was formalized as part of [OSforGFF](https://github.com/mrdouglasny/OSforGFF) (Osterwalder–Schrader axioms for the Gaussian Free Field) where it is used for reflection positivity via the Hadamard exponential. It is extracted here as a standalone contribution. The original proof was written by the authors listed in the file. Cleanup for Mathlib conventions (naming, generality, `simp only` squeezing, attribute audit, documentation) was assisted by Claude Code (Anthropic). ### References * Schur, I. (1911). Bemerkungen zur Theorie der beschränkten Bilinearformen mit unendlich vielen Veränderlichen. J. reine angew. Math., 140, 1–28. --- Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Schur.20product.20theorem.20.28Hadamard.20product.20preserves.20posdef.29	t-analysis new-contributor awaiting-author	109/0	Mathlib.lean,Mathlib/Analysis/Matrix/SchurProduct.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/Vec.lean,docs/references.bib	5	37	['eric-wieser', 'github-actions', 'j-loreaux', 'mrdouglasny', 'themathqueen']	nobody	0-4061 1 hour ago	9-58977 9 days ago	0-9107 2 hours
35879	Jun2M author:Jun2M	feat(Combinatorics/Graph): graph deletion operations	This PR adds definitions and basic lemmas for deleting edges and vertices from a graph in Mathlib/Combinatorics/Graph/Delete.lean. It introduces the following operations: - `G ↾ F` (edgeRestrict): The subgraph of G restricted to the edges in F (vertices are preserved). - `G ＼ F` (edgeDelete): The subgraph of G with the edges in F deleted. - `G[X]` (induce): The subgraph of G induced by the set of vertices X. - `G - X` (vertexDelete): The graph obtained from G by deleting the set of vertices X. These definitions are accompanied by simp lemmas describing their edge sets, incidence relations, and basic properties such as monotonicity. Co-authored-by: Peter Nelson [apn.uni@gmail.com](mailto:apn.uni@gmail.com) --- - [x] depends on: #26770 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics maintainer-merge	208/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Delete.lean	2	9	['Jun2M', 'YaelDillies', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-3960 1 hour ago	15-78701 15 days ago	15-84876 15 days
37705	Wolfman56 author:Wolfman56	feat: log inequalities, chi-squared MGF, and Johnson-Lindenstrauss lemma	## Summary Three new formalizations implementing the Dasgupta–Gupta (2003) elementary Gaussian proof of the Johnson–Lindenstrauss (JL) lemma, arranged as a dependency chain: --- ### 1. `Mathlib.Analysis.SpecialFunctions.Log.Inequalities` Sharp upper bounds on the natural logarithm needed for JL Chernoff bounds: - `Real.log_one_add_le` : `Real.log (1 + ε) ≤ ε − ε² / 4` for `ε ∈ [0, 1]` - `Real.log_one_sub_le` : `Real.log (1 − ε) ≤ −ε − ε² / 4` for `ε ∈ [0, 1)` Proved via `MonotoneOn`/`AntitoneOn` from `HasDerivAt` and the mean value theorem. These complement the existing lower bound `Real.le_log_one_add_of_nonneg`. --- ### 2. `Mathlib.Probability.Moments.ChiSquared` - `mgf_sq_gaussianReal` : `mgf (fun ω => X ω ^ 2) ℙ t = (1 - 2 * t) ^ (-(1/2) : ℝ)` for `X ~ N(0,1)`, `t < 1/2` Uses `integral_gaussianReal_eq_integral_smul`, completing the square, and `integral_gaussian`. This is the χ²(1) MGF identity. Mathlib has `ProbabilityTheory.mgf_gaussianReal` (MGF of X) but not of X². --- ### 3. `Mathlib.Probability.Concentration.JohnsonLindenstrauss` Full formalization of the JL lemma (Dasgupta–Gupta 2003): for any finite n-point set S ⊆ ℝᵈ, a random Gaussian projection into ℝᵐ with m ≥ 4 ε⁻² log n is an ε-isometry with positive probability. Key declarations: `gaussianMatrixMeasure`, `jl_chisq_complement_bound`, `jl_concentration_single_pair`, `jl_union_bound`, `johnson_lindenstrauss`. --- ## Prior Art Check (Loogle, 2026-04-06) All seven public declarations confirmed absent from Mathlib master. Nearest existing results noted in the per-file module headers. --- ## Use of AI This PR was developed with significant assistance from AI tools — specifically GitHub Copilot (Claude Sonnet) acting as a coding agent, and Google Gemini used for independent review. The AI was used to: - Write the initial Lean proof code for all three files - Iterate on proof tactics when goals did not close - Check naming conventions against Mathlib style (Gemini flagged that the log lemmas should live in `namespace Real`, which was corrected before submission) - Verify that the union bound proof used `measure_biUnion_finset_le` and `Finset.sum_const` correctly The author has reviewed all code, understands the mathematical content and proof structure, and can vouch for the correctness of the arguments. The proofs follow the standard Dasgupta–Gupta (2003) route and use only established Mathlib APIs. Reviewers should be aware that AI-generated Lean code can have subtle issues with generality and Mathlib integration that are not immediately apparent from a clean build result. --- ## Reference S. Dasgupta and A. Gupta, An elementary proof of a theorem of Johnson and Lindenstrauss, Random Structures and Algorithms 22(1):60–65, 2003.	new-contributor LLM-generated	1032/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/Inequalities.lean,Mathlib/Probability/Concentration/JohnsonLindenstrauss.lean,Mathlib/Probability/Moments/ChiSquared.lean	4	2	['github-actions']	nobody	0-3920 1 hour ago	0-7818 2 hours ago	0-130 2 minutes
37711	MavenRain author:MavenRain	feat(Tactic/ClearUnneeded): add clear_unneeded tactic	Addresses #25319	t-meta new-contributor	53/0	Mathlib.lean,Mathlib/Tactic/ClearUnneeded.lean	2	2	['github-actions']	nobody	0-3708 1 hour ago	0-3380 56 minutes ago	0-402 6 minutes
37713	sgouezel author:sgouezel	chore: fix a diamond in NNReal	Currently, 0 and bot are not reducibly defeq in NNReal --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	16/11	Mathlib/Data/NNReal/Defs.lean	1	1	['github-actions']	nobody	0-3345 55 minutes ago	0-3411 56 minutes ago	0-3401 56 minutes
37707	MavenRain author:MavenRain	feat(Combinatorics/SimpleGraph): add IsMaximalClique/IsMaximalIndepSet, refactor IsMaximum* to MaximalFor	Addresses #34962	new-contributor t-combinatorics	92/31	Mathlib/Combinatorics/SimpleGraph/Clique.lean,MathlibTest/ClearUnneeded.lean	2	2	['github-actions']	nobody	0-3158 52 minutes ago	0-2692 44 minutes ago	0-1002 16 minutes
37706	zayn7lie author:zayn7lie	feat: parallel β-reduction and Church–Rosser theorem for untyped λ-calculus (de Bruijn)	This PR develops a small, self-contained formalization of the untyped λ-calculus (using de Bruijn indices), culminating in a proof of the Church–Rosser theorem via parallel β-reduction (complete developments). ## Main contributions * A de Bruijn syntax for λ-terms together with substitution and shifting operations. * Definition of one-step β-reduction. * Definition of parallel β-reduction (`Par`) and its basic properties. * Abstract confluence infrastructure (`Diamond`, `Confluent`) for binary relations. * Proof that parallel β-reduction satisfies the diamond property. * Deduction of confluence of β-reduction (Church–Rosser theorem) via standard closure arguments. The development follows the classical proof strategy: parallel reduction → diamond → confluence → Church–Rosser. ## Design choices * De Bruijn indices are used to avoid α-equivalence bookkeeping. * Parallel reduction is defined inductively to enable a direct diamond proof. * Confluence lemmas are factored through generic relation-theoretic definitions (`Diamond`, `Confluent`) to keep the proof modular. ## Future directions * Integration with existing rewriting / relation infrastructure in mathlib. * Extending to typed λ-calculi (e.g. STLC) or normalization results. * Aligning substitution/shifting APIs with mathlib conventions if similar infrastructure is introduced elsewhere. ## Notes for reviewers * The core proof follows the standard "complete developments" argument; feedback on structuring the confluence layer to better match mathlib conventions would be especially appreciated. * Naming and API surface (especially substitution / shifting) may benefit from further alignment with existing libraries. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	729/0	Mathlib/Computability/LambdaCalculus/BetaReduction.lean,Mathlib/Computability/LambdaCalculus/ChurchRosser.lean,Mathlib/Computability/LambdaCalculus/ConfluentReduction.lean,Mathlib/Computability/LambdaCalculus/DeBruijnSyntax.lean,Mathlib/Computability/LambdaCalculus/ParallelReduction.lean	5	2	['github-actions']	nobody	0-3029 50 minutes ago	0-6275 1 hour ago	0-463 7 minutes
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	93/2	Mathlib/Analysis/Normed/Module/RCLike/Extend.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean	2	9	['ADedecker', 'github-actions', 'j-loreaux', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	urkud assignee:urkud	0-3015 50 minutes ago	0-3076 51 minutes ago	26-56529 26 days
36201	themathqueen author:themathqueen	feat(Analysis/CStarAlgebra): set of star projections equals the extreme points of the nonnegative closed unit ball	An element in a non-unital C⋆-algebra is a projection iff it is an extreme point of the nonnegative closed unit ball. This is from 1.6.2 in Sakai's C⋆-algebras and W⋆-algebras (the proof is different though). Co-authored-by: Jon Bannon <59937998+JonBannon@users.noreply.github.com> --- - [x] depends on: #35997 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	103/0	Mathlib.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/CStarAlgebra/Extreme.lean,docs/references.bib	4	11	['github-actions', 'j-loreaux', 'loefflerd', 'mathlib-dependent-issues', 'themathqueen']	mcdoll assignee:mcdoll	0-2837 47 minutes ago	0-2719 45 minutes ago	26-23022 26 days
37702	grunweg author:grunweg	chore: golf using {norm,push}_cast	Not exhaustive --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	22/18	Archive/Imo/Imo2025Q3.lean,Mathlib/Algebra/Ring/GeomSum.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Data/Int/Log.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/SumFourSquares.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/WittVector/WittPolynomial.lean	11	3	['github-actions', 'j-loreaux']	nobody	0-2820 47 minutes ago	0-2820 46 minutes ago	0-11966 3 hours
37712	eric-wieser author:eric-wieser	feat: add a `LawfulXor` typeclass	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	100/0	Mathlib.lean,Mathlib/Data/LawfulXor.lean	2	1	['github-actions']	nobody	0-2788 46 minutes ago	0-3530 58 minutes ago	0-3520 58 minutes
37703	euprunin author:euprunin	chore: golf using `grind`/`simp_all`	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.not_of_mem_foldl_argAux`: unchanged 🎉 * `✅️ MulAction.IsBlock.subsingleton_of_card_lt`: unchanged 🎉 * `✅️ Ordinal.IsFundamentalSequence.of_isNormal`: 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/)	ready-to-merge	3/32	Mathlib/Data/List/MinMax.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/SetTheory/Ordinal/FundamentalSequence.lean	3	2	['github-actions', 'j-loreaux']	nobody	0-2733 45 minutes ago	0-2733 45 minutes ago	0-12021 3 hours
34154	euprunin author:euprunin	chore: golf using `grind` (and add four supporting `grind` annotations)	The goal of this golfing PR is to decrease the number of times lemmas are called explicitly (replacing calls to lemmas with calls to tactics). Any decrease in compilation time is a welcome side effect, although it is not a primary objective. Trace profiling results (shown if ≥10 ms before or after): * `Orientation.nonneg_inner_and_areaForm_eq_zero_iff_sameRay`: 311 ms before, 284 ms after 🎉 * `UV.compression_self`: 29 ms before, 19 ms after 🎉 * `IsSepClosed.exists_root_C_mul_X_pow_add_C_mul_X_add_C`: 405 ms before, 291 ms after 🎉 * `InnerProductGeometry.norm_add_eq_add_norm_iff_angle_eq_zero`: 425 ms before, 309 ms after 🎉 This golfing PR is batched under the following guidelines: * Up to ~5 changed files per PR * Up to ~25 changed declarations per PR * Up to ~100 changed lines per PR --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		9/30	Mathlib/Algebra/Polynomial/Degree/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Combinatorics/SetFamily/Compression/UV.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean	6	16	['Parcly-Taxel', 'Vierkantor', 'artie2000', 'euprunin', 'github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'tb65536']	Vierkantor assignee:Vierkantor	0-2679 44 minutes ago	0-2945 48 minutes ago	64-27825 64 days
37709	j-loreaux author:j-loreaux	feat: add some missing convenience lemmas about ordered modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	32/0	Mathlib/Algebra/Order/Module/Defs.lean	1	2	['github-actions', 'themathqueen']	nobody	0-2240 37 minutes ago	0-4265 1 hour ago	0-4255 1 hour
37710	sgouezel author:sgouezel	chore: fix diamonds in ENNReal	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	18/46	Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Real.lean	2	1	['github-actions']	nobody	0-1624 27 minutes ago	0-1464 24 minutes ago	0-608 10 minutes
37714	mortarsanjaya author:mortarsanjaya	feat(Algebra/Order/Floor/Defs): `Nat.cast` is 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`. The `NeZero` and `Nontrivial` instances on `FloorSemiring` and `FloorRing` are moved above because their naming is quite weird currently. The instances `NeZero 1` seems to still be weirdly named as well. 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$	84/29	Mathlib/Algebra/Order/Floor/Defs.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean	3	2	['github-actions']	nobody	0-531 8 minutes ago	0-613 10 minutes ago	0-603 10 minutes
37448	SnirBroshi author:SnirBroshi	chore(Algebra): use `IsMulCommutative` to spell `Std.Commutative (· * ·)`	and use `IsAddCommutative` to spell `Std.Commutative (· + ·)`. Also makes `Is{Mul/Add}Commutative.is_comm` instances so that core lemmas (or `grind`) can synthesize `Std.Commutative`. --- Hopefully this is useful since #36549 was merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	116/151	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/ZPowers/Basic.lean,Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Star/CentroidHom.lean,Mathlib/CategoryTheory/Center/Basic.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/GroupTheory/Commutator/Basic.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Focal.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/KleinFour.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic/Basic.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean,Mathlib/RepresentationTheory/Irreducible.lean	21	21	['SnirBroshi', 'github-actions', 'j-loreaux', 'leanprover-radar', 'tb65536', 'vihdzp']	tb65536 assignee:tb65536	0-504 8 minutes ago	5-37154 5 days ago	5-47574 5 days
35963	Parcly-Taxel author:Parcly-Taxel	refactor: tidy `IdemSemiring` and `KleeneAlgebra`	* Remove `universe u` at the beginning in favour of `Type` Make `IdemSemiring` extend `OrderBot` rather than duplicating the fields * Correct the docstring for `KleeneAlgebra` * Derive Proposition 2 in Kozen's 1994 paper: ```lean one_add_mul_kstar (a : α) : 1 + a * a∗ = a∗ one_add_kstar_mul (a : α) : 1 + a∗ * a = a∗ ``` * Use `where` notation consistently in `Algebra.Order.Kleene`	t-algebra label:t-algebra$	83/85	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean	3	39	['Parcly-Taxel', 'YaelDillies', 'dagurtomas', 'eric-wieser', 'github-actions', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	0-317 5 minutes ago	0-830 13 minutes ago	34-5909 34 days
35638	vihdzp author:vihdzp	chore(Topology/Order/OrderClosed): use `to_dual`	--- - [x] depends on: #35637 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated t-topology t-order	118/280	Mathlib/Order/ConditionallyCompletePartialOrder/Defs.lean,Mathlib/Order/Cover.lean,Mathlib/Topology/Order/OrderClosed.lean	3	18	['JovanGerb', 'bryangingechen', 'github-actions', 'mathlib-bors', 'mathlib-dependent-issues', 'vihdzp']	nobody	0-289 4 minutes ago	16-50304 16 days ago	15-60501 15 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	614-43895 1 year ago	unknown	0-0 0 seconds
14167	alreadydone author:alreadydone	feat: Group scheme structure on Weierstrass curve	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebraic-geometry workshop-AIM-AG-2024	727/41	Mathlib.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Scheme.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Universal.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean	12	3	['Multramate', 'github-actions', 'jcommelin']	nobody	614-43895 1 year ago	649-4250 649 days ago	0-12 12 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	614-43894 1 year ago	678-44592 678 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	614-43893 1 year ago	688-3880 688 days ago	5-74504 5 days
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	614-43893 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	614-43893 1 year ago	682-68321 682 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	614-43892 1 year ago	718-65988 718 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	614-43891 1 year ago	801-36015 801 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	614-43891 1 year ago	781-11941 781 days ago	1-29105 1 day
10594	lecopivo author:lecopivo	feat: `fun_trans` function transformation tactic e.g. for computing derivatives	feat: `fun_trans` function transformation tactic e.g. for computing derivatives Function transformation tactic/simproc. For example it can be used for computing derivatives. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-meta	1819/56	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/Core.lean,Mathlib/Tactic/FunProp/Decl.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/FunctionData.lean,Mathlib/Tactic/FunProp/MorExt.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunTrans/Attr.lean,Mathlib/Tactic/FunTrans/Core.lean,Mathlib/Tactic/FunTrans/Decl.lean,Mathlib/Tactic/FunTrans/Elab.lean,Mathlib/Tactic/FunTrans/Theorems.lean,Mathlib/Tactic/FunTrans/Types.lean,test/fun_prop2.lean,test/fun_prop_dev.lean,test/fun_trans_dev.lean	17	11	['github-actions']	nobody	614-43891 1 year ago	unknown	0-0 0 seconds
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	614-43891 1 year ago	664-22293 664 days ago	64-12984 64 days
10842	mcdoll author:mcdoll	chore: simplify proofs using new positivity extensions and tests	--- - [x] depends on: #10661 - [ ] depends on: #10796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP blocked-by-other-PR	98/50	Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/SpecialFunctions/Gaussian.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Real.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Unique.lean,Mathlib/MeasureTheory/Function/ContinuousMapDense.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Measure/Tilted.lean,Mathlib/Probability/Martingale/Upcrossing.lean,Mathlib/Probability/Moments.lean,Mathlib/Probability/Variance.lean,Mathlib/Tactic/Positivity/Core.lean,test/positivity.lean	14	1	['leanprover-community-mathlib4-bot']	nobody	614-43891 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	614-43891 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	614-43890 1 year ago	831-16214 831 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	614-43890 1 year ago	854-9253 854 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	614-43890 1 year ago	861-77832 861 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	614-43890 1 year ago	831-9537 831 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	614-43890 1 year ago	854-33786 854 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	614-43890 1 year ago	850-16984 850 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	614-43890 1 year ago	847-75720 847 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	614-43890 1 year ago	821-1981 821 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	614-43890 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	614-43890 1 year ago	804-74516 804 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	614-43890 1 year ago	808-79888 808 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	614-43890 1 year ago	808-85136 808 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	614-43890 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	614-43890 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	614-43890 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	614-43890 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	614-43889 1 year ago	900-6653 900 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	614-43889 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	36	['adomani', 'alreadydone', 'digama0', 'eric-wieser', 'ericrbg', 'jcommelin', 'leanprover-bot', 'sgouezel']	nobody	614-43889 1 year ago	889-9386 889 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	614-43889 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	614-43889 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	614-43889 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	614-43889 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	614-43889 1 year ago	893-12717 893 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	614-43889 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	614-43889 1 year ago	912-31121 912 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	614-43889 1 year ago	847-27492 847 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	614-43889 1 year ago	908-78597 908 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	614-43889 1 year ago	902-38027 902 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	614-43889 1 year ago	760-53720 760 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	614-43889 1 year ago	668-60397 668 days ago	1-47913 1 day
7909	mcdoll author:mcdoll	fix(Tactic/Continuity): remove npowRec and add new tag for Continuous.pow	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-topology t-meta	14/9	Mathlib/Tactic/Continuity.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,test/Continuity.lean	3	2	['eric-wieser']	nobody	614-43889 1 year ago	893-69189 893 days ago	0-72515 20 hours
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	614-43889 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	614-43889 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	614-43889 1 year ago	869-64023 869 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	614-43888 1 year ago	1027-29940 1027 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	614-43888 1 year ago	1025-45014 1025 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	614-43888 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	614-43888 1 year ago	982-44250 982 days ago	9-71263 9 days
6079	eric-wieser author:eric-wieser	fix: deduplicate variables	`variables {A} [Ring A]` meant "update the binder of `A`" in Lean 3, but now means "create a duplicate variable called `A`" (or at least, does so when inspecting the state within the variables line). This removes a number of porting notes that were stumbling over this behavior. [Related Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/unexpected.20.60variable.60.20behaviour.3F/near/360154080) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-CI	1012/443	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/Algebra/CharP/Basic.lean,Mathlib/Algebra/CovariantAndContravariant.lean,Mathlib/Algebra/DirectLimit.lean,Mathlib/Algebra/DirectSum/Finsupp.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Pi.lean,Mathlib/Algebra/GroupPower/Basic.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Aut.lean,Mathlib/Algebra/Hom/Equiv/Basic.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory.lean,Mathlib/Algebra/Homology/ImageToKernel.lean,Mathlib/Algebra/Homology/ShortComplex/LeftHomology.lean,Mathlib/Algebra/IndicatorFunction.lean,Mathlib/Algebra/Jordan/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TensorProduct.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Ring/Lemmas.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Support.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Point.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/MooreComplex.lean,Mathlib/Analysis/Calculus/ContDiff.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/LocalExtr.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Independent.lean,Mathlib/Analysis/Convex/Intrinsic.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/BalancedCoreHull.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/Completion.lean,Mathlib/Analysis/NormedSpace/LinearIsometry.lean,Mathlib/Analysis/NormedSpace/Multilinear.lean,Mathlib/Analysis/NormedSpace/OperatorNorm.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Action.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Endofunctor/Algebra.lean,Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Functor/Category.lean,Mathlib/CategoryTheory/Limits/Fubini.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Discrete.lean	302	1	['timotree3']	nobody	614-43888 1 year ago	unknown	0-0 0 seconds
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	614-43888 1 year ago	unknown	0-0 0 seconds
6210	MohanadAhmed author:MohanadAhmed	feat(Data/IsROrC/Basic): add a `StarOrderedRing` instance	This PR implements a suggestion by @urkud on [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/PartialOrder.20and.20StarOrderedRing.20on.20IsROrC) on how to get a `StarOrderedRing` on the `IsROrC` class. In that discussion the suggested step were: 1. Add PartialOrder K to the list of extends and add le_iff_re_im : z ≤ w ↔ re z ≤ re w ∧ im z = im w to the list of axioms. 2. Prove StarOrderedRing instance for any IsROrC. 3. Add (almost trivial) le_iff_re_im proofs to IsROrC instances for real and complex numbers. This PR does exactly these three steps --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-algebra t-analysis label:t-algebra$	25/24	Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/IsROrC/Basic.lean	4	19	['MohanadAhmed', 'eric-wieser', 'j-loreaux']	nobody	614-43888 1 year ago	971-3996 971 days ago	12-17588 12 days
6328	astrainfinita author:astrainfinita	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	614-43888 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	614-43888 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	614-43888 1 year ago	858-83030 858 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	614-43888 1 year ago	886-29888 886 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	614-43888 1 year ago	769-41197 769 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	614-43887 1 year ago	953-68023 953 days ago	45-49128 45 days
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	610-20197 1 year ago	713-58239 713 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	607-31866 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	602-1042 1 year ago	604-10484 604 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	600-37542 1 year ago	912-18421 912 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	600-37433 1 year ago	726-46270 726 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	600-36966 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	600-35365 1 year ago	691-40570 691 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	600-22129 1 year ago	654-42624 654 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	599-36281 1 year ago	629-83263 629 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	599-33757 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	599-33723 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	599-33642 1 year ago	821-33069 821 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	599-33607 1 year ago	755-42989 755 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	599-33429 1 year ago	643-16459 643 days ago	143-73801 143 days
9154	astrainfinita author:astrainfinita	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	599-33220 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	599-33194 1 year ago	953-49717 953 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	599-33139 1 year ago	988-70047 988 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	599-33133 1 year ago	965-31187 965 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	599-31743 1 year ago	631-45935 631 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	596-278 1 year ago	659-76264 659 days ago	1-84718 1 day
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	596-36 1 year ago	682-10020 682 days ago	29-50022 29 days
9978	astrainfinita author:astrainfinita	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	595-86228 1 year ago	793-80410 793 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	595-85539 1 year ago	707-33212 707 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	595-21190 1 year ago	630-27412 630 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	595-10243 1 year ago	604-56405 604 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	593-23464 1 year ago	712-15092 712 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	593-23444 1 year ago	629-15812 629 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	593-23282 1 year ago	902-47498 902 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	587-36886 1 year ago	636-38773 636 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	586-5162 1 year ago	606-85260 606 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	585-3075 1 year ago	585-7336 585 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	581-82425 1 year ago	613-41684 613 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	581-12818 1 year ago	585-46327 585 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	580-20878 1 year ago	652-77397 652 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	574-43219 1 year ago	634-83747 634 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	574-19684 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	573-11676 1 year ago	725-24418 725 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	572-56051 1 year ago	881-3833 881 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	568-65284 1 year ago	651-31844 651 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	566-35838 1 year ago	753-9508 753 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	564-24447 1 year ago	565-21536 565 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	561-73812 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	559-46733 1 year ago	663-27210 663 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	559-7084 1 year ago	646-82431 646 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	553-63486 1 year ago	914-27703 914 days ago	0-16 16 seconds
17127	astrainfinita author:astrainfinita	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	553-58529 1 year ago	553-58529 553 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	551-3062 1 year ago	566-31136 566 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	551-3062 1 year ago	566-31137 566 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	551-3061 1 year ago	566-26887 566 days ago	0-613 10 minutes
5995	astrainfinita author:astrainfinita	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	544-17271 1 year ago	669-37932 669 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	539-24411 1 year ago	542-22109 542 days ago	49-319 49 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	539-24035 1 year ago	579-56369 579 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	537-61203 1 year ago	656-7422 656 days ago	0-600 10 minutes
10796	mcdoll author:mcdoll	feat(Tactic/Positivity): non-negativity of functions	--- This makes the `Finset.sum` and `integral_nonneg` extensions even more useful. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	27/0	Mathlib/Tactic/Positivity/Core.lean	1	1	['YaelDillies']	nobody	533-43057 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	533-25719 1 year ago	682-7817 682 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	520-37047 1 year ago	598-11028 598 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	518-69840 1 year ago	790-33139 790 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	518-48397 1 year ago	569-37228 569 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	517-82594 1 year ago	582-71040 582 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	516-53995 1 year ago	516-53995 516 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	514-10116 1 year ago	549-85828 549 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	514-9747 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	510-61939 1 year ago	818-32009 818 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	509-48948 1 year ago	523-35136 523 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	508-33341 1 year ago	807-33784 807 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	507-43095 1 year ago	658-38731 658 days ago	63-69226 63 days
16637	astrainfinita author:astrainfinita	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	507-42333 1 year ago	572-49689 572 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	504-19315 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	503-5969 1 year ago	731-33397 731 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	502-29311 1 year ago	543-14892 543 days ago	0-74903 20 hours
17623	astrainfinita author:astrainfinita	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	502-29311 1 year ago	509-21870 509 days ago	33-53295 33 days
17624	astrainfinita author:astrainfinita	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	498-66483 1 year ago	543-13762 543 days ago	0-465 7 minutes
17513	astrainfinita author:astrainfinita	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	497-25505 1 year ago	541-27370 541 days ago	4-72589 4 days
17515	astrainfinita author:astrainfinita	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	497-25504 1 year ago	546-13016 546 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	496-30750 1 year ago	496-30750 496 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	494-6827 1 year ago	494-6827 494 days ago	3-72207 3 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	482-58896 1 year ago	482-58896 482 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	479-71365 1 year ago	506-32747 506 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	478-32291 1 year ago	500-54537 500 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	472-42111 1 year ago	669-15760 669 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	472-42110 1 year ago	758-31591 758 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	472-24371 1 year ago	492-50016 492 days ago	0-370 6 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	472-15666 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	458-83000 1 year ago	607-78066 607 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	458-82877 1 year ago	534-82230 534 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	456-57530 1 year ago	1082-59561 1082 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	454-75070 1 year ago	454-75070 454 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	453-13113 1 year ago	453-13113 453 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	448-19702 1 year ago	448-19702 448 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	446-6977 1 year ago	538-84947 538 days ago	0-4704 1 hour
18474	astrainfinita author:astrainfinita	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	446-6732 1 year ago	446-6732 446 days ago	76-67978 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	445-41666 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	445-26063 1 year ago	566-37224 566 days ago	9-13962 9 days
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	444-78382 1 year ago	484-77995 484 days ago	33-8818 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	442-85636 1 year ago	634-51063 634 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	442-70232 1 year ago	534-80251 534 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	441-39562 1 year ago	441-39562 441 days ago	69-24210 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	440-13641 1 year ago	445-67442 445 days ago	27-52347 27 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	438-42852 1 year ago	500-54557 500 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	433-30989 1 year ago	433-30989 433 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	431-21582 1 year ago	1078-53121 1078 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	430-85487 1 year ago	460-11366 460 days ago	101-64856 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	430-85364 1 year ago	457-66820 457 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	425-50166 1 year ago	731-32789 731 days ago	91-37374 91 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	423-6184 1 year ago	457-42114 457 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	422-5305 1 year ago	500-54549 500 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	420-74699 1 year ago	427-39216 427 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	419-86116 1 year ago	761-23395 761 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	418-16226 1 year ago	439-44496 439 days ago	52-4018 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	416-22645 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	416-22398 1 year ago	423-34020 423 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	410-77569 1 year ago	410-77569 410 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	410-65226 1 year ago	623-37244 623 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	410-32533 1 year ago	831-17864 831 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	408-83786 1 year ago	415-79851 415 days ago	2-38741 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	404-43966 1 year ago	412-46596 412 days ago	4-9045 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	403-82834 1 year ago	576-27665 576 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	401-9027 1 year ago	651-80027 651 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	399-32117 1 year ago	637-15044 637 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	398-4086 1 year ago	434-7863 434 days ago	17-17852 17 days
16000	YaelDillies author:YaelDillies	feat: Croot-Sisask Almost Periodicity	Almost periodicity is nowadays a standard tool in additive combinatorics. From LeanAPAP --- - [ ] depends on: #15443 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics t-analysis blocked-by-other-PR	0/0		0	4	['github-actions', 'leanprover-community-mathlib4-bot', 'mergify']	nobody	397-33407 1 year ago	594-27078 594 days ago	0-159 2 minutes
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	397-20668 1 year ago	404-2595 404 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	397-17010 1 year ago	397-17010 397 days ago	16-76141 16 days
18470	astrainfinita author:astrainfinita	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	392-74837 1 year ago	392-74837 392 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	391-12506 1 year ago	528-24025 528 days ago	22-48253 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	389-74569 1 year ago	571-40519 571 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	389-12836 1 year ago	572-16065 572 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	385-39265 1 year ago	385-39265 385 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	384-71299 1 year ago	645-48790 645 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	383-6932 1 year ago	504-71260 504 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	380-25968 1 year ago	480-66639 480 days ago	21-82868 21 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	375-69900 1 year ago	601-13043 601 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	371-40168 1 year ago	433-72242 433 days ago	7-31913 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	370-48235 1 year ago	395-77191 395 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	369-74065 1 year ago	370-78222 370 days ago	0-949 15 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	369-24127 1 year ago	384-57618 384 days ago	0-83153 23 hours
13124	astrainfinita author:astrainfinita	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	368-52104 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	365-43224 1 year ago	559-20595 559 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	364-36269 11 months ago	384-86109 384 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	362-50127 11 months ago	385-54504 385 days ago	12-18667 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	362-25412 11 months ago	362-25413 362 days ago	57-47357 57 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	362-25410 11 months ago	362-25412 362 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	362-24883 11 months ago	404-28918 404 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	362-24883 11 months ago	404-27659 404 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	361-37944 11 months ago	494-26361 494 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	361-28140 11 months ago	436-20340 436 days ago	5-6208 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	360-48149 11 months ago	391-49648 391 days ago	0-568 9 minutes
16314	astrainfinita author:astrainfinita	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	356-50376 11 months ago	356-50378 356 days ago	55-36935 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	356-34029 11 months ago	357-85828 357 days ago	5-26623 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	355-82029 11 months ago	654-25536 654 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	355-81908 11 months 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	355-81883 11 months 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	355-81841 11 months ago	630-13321 630 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	355-81709 11 months ago	962-38572 962 days ago	29-67421 29 days
15483	astrainfinita author:astrainfinita	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	355-81669 11 months ago	604-33599 604 days ago	4-79214 4 days
16594	astrainfinita author:astrainfinita	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	355-81445 11 months ago	560-34592 560 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	353-85785 11 months ago	497-19351 497 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	353-85738 11 months ago	437-9806 437 days ago	8-45680 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	353-85567 11 months ago	390-18434 390 days ago	3-29389 3 days
19613	madvorak author:madvorak	refactor(Combinatorics/Optimization/ValuedCSP): make only valid `FractionalOperation` possible	Originally `FractionalOperation` was any multiset (possible empty). Then `FractionalOperation.IsValid` said it was nonempty. Instead, I would like to make it nonempty by definition. As a result, empty/invalid fractional operation couldn't be declared at all. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	14/17	Mathlib/Combinatorics/Optimization/ValuedCSP.lean	1	1	['github-actions']	nobody	353-85285 11 months ago	483-20026 483 days ago	9-74124 9 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	353-81870 11 months ago	433-72843 433 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	352-17848 11 months ago	unknown	0-0 0 seconds
12605	astrainfinita author:astrainfinita	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	352-12463 11 months ago	684-44034 684 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	349-38286 11 months ago	362-48927 362 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	349-17718 11 months ago	351-34623 351 days ago	0-217 3 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	347-15061 11 months ago	347-15063 347 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	347-3758 11 months ago	347-3759 347 days ago	2-12017 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	345-13933 11 months ago	397-25954 397 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	343-31129 11 months ago	368-34143 368 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	343-23533 11 months ago	410-59608 410 days ago	23-20117 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	342-16201 11 months ago	394-2567 394 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	341-21440 11 months ago	631-20185 631 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	338-46653 11 months ago	339-29576 339 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	338-46309 11 months 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	338-45986 11 months ago	633-32540 633 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	338-45946 11 months ago	643-62291 643 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	338-45577 11 months ago	869-17257 869 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	338-45565 11 months ago	891-40560 891 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	338-45559 11 months 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	338-45473 11 months 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	338-45469 11 months ago	567-6842 567 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	337-29123 11 months ago	343-57675 343 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	335-78988 11 months ago	605-15773 605 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	334-80949 10 months ago	412-19572 412 days ago	43-81252 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	332-76829 10 months ago	332-76829 332 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	332-12623 10 months ago	332-12623 332 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	330-38167 10 months ago	330-38167 330 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	329-14548 10 months 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	328-36232 10 months 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	328-30607 10 months 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	327-25700 10 months ago	336-5702 336 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	326-26942 10 months ago	572-19760 572 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 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	1	['github-actions']	nobody	325-24844 10 months ago	325-24657 325 days ago	0-874 14 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	314-10508 10 months ago	314-10510 314 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	309-23134 10 months ago	710-72405 710 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	305-27075 10 months ago	305-27966 305 days ago	0-10787 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	304-60515 10 months ago	502-21456 502 days ago	87-65922 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	304-60515 10 months ago	592-35095 592 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	303-68861 9 months ago	687-10114 687 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	303-34150 9 months ago	365-25828 365 days ago	0-7729 2 hours
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	303-33335 9 months ago	303-33337 303 days ago	6-39812 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	302-50002 9 months ago	418-86281 418 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	296-61414 9 months ago	435-12995 435 days ago	27-62333 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	294-16494 9 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	291-39631 9 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	291-25076 9 months ago	523-22975 523 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	291-25074 9 months ago	523-24618 523 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	291-25073 9 months ago	523-25260 523 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	288-7364 9 months ago	526-33580 526 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	283-46086 9 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	283-42060 9 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	275-59337 9 months ago	547-6980 547 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	275-58831 9 months ago	388-23003 388 days ago	0-1295 21 minutes
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	275-58425 9 months ago	275-58425 275 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	275-58424 9 months ago	275-58424 275 days ago	40-60910 40 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	275-58178 9 months ago	275-58179 275 days ago	45-4562 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	275-58175 9 months ago	308-33292 308 days ago	6-44784 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	275-58160 9 months ago	292-9483 292 days ago	10-56011 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	275-26860 9 months ago	275-25767 275 days ago	32-74826 32 days
24405	mcdoll author:mcdoll	refactor(Topology/Algebra/Module/WeakDual): Clean up	- Move `Dual` and `dualPairing` lower in the import-hierachy - deduplicate `dualPairing` - Make `WeakDual` and `WeakSpace` reducible --- New version of #11500 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-topology large-import	146/162	Mathlib.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/LocallyConvex/WeakSpace.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/VonNeumannAlgebra/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/Topology/Algebra/Module/Dual.lean,Mathlib/Topology/Algebra/Module/WeakDual.lean,docs/overview.yaml,docs/undergrad.yaml	14	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	274-23295 9 months ago	274-23296 274 days ago	69-52361 69 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	273-61456 8 months ago	273-80663 273 days ago	3-72995 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	265-28062 8 months ago	298-9417 298 days ago	3-31703 3 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	263-34523 8 months ago	406-34028 406 days ago	31-68555 31 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	257-79002 8 months ago	264-44769 264 days ago	45-38763 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	257-35888 8 months ago	277-21604 277 days ago	0-10699 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	254-66470 8 months ago	333-78575 333 days ago	0-328 5 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	251-20061 8 months ago	600-23514 600 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	249-30315 8 months ago	786-23241 786 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	249-27958 8 months ago	295-13049 295 days ago	0-1208 20 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	249-13201 8 months ago	468-80702 468 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	248-69173 8 months ago	320-29813 320 days ago	29-42365 29 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	245-36506 8 months ago	275-58175 275 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	244-38648 8 months ago	388-75854 388 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	244-38600 8 months ago	388-75853 388 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	244-38593 8 months ago	378-70886 378 days ago	10-44563 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	244-38549 8 months ago	420-37583 420 days ago	32-79324 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	244-38534 8 months ago	449-14468 449 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	244-38527 8 months ago	517-47096 517 days ago	0-1609 26 minutes
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	244-38521 8 months ago	505-60414 505 days ago	13-6188 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	244-38465 8 months ago	424-23025 424 days ago	0-19114 5 hours
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	244-38257 8 months ago	457-39596 457 days ago	193-74502 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	243-69208 8 months ago	547-25915 547 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	239-42068 7 months ago	440-16883 440 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	239-35035 7 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	238-13312 7 months ago	327-81071 327 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	236-34215 7 months ago	236-34216 236 days ago	32-70098 32 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	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	236-33938 7 months ago	384-18820 384 days ago	0-1302 21 minutes
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	235-75411 7 months ago	235-75411 235 days ago	71-28496 71 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. --- - [ ] 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', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	234-12361 7 months ago	632-10313 632 days ago	7-77799 7 days
14583	lecopivo author:lecopivo	fix: make concrete cycle notation local	fix: make c[...] notation for concrete cycles local --- The notation for concrete cycles prevents you using `c[i]` notation for `c : Array _` This currently does not work ``` import Mathlib variable (c : Array Nat) (i : Fin c.size) #check c[i] -- breaks because of notation for concrete cycles ``` This PR just marks it as local to prevent this issue. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	1/1	Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	1	3	['eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	231-42580 7 months ago	635-79146 635 days ago	0-12793 3 hours
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	231-32566 7 months ago	657-45368 657 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	229-74530 7 months ago	328-19579 328 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	228-3672 7 months ago	450-60631 450 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	227-66703 7 months ago	928-19188 928 days ago	0-84 1 minute
13795	astrainfinita author:astrainfinita	perf(Algebra/{Group, GroupWithZero, Ring}/InjSurj): reduce everything	--- - [ ] depends on: #15192 - [ ] depends on: #15476 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict t-algebra label:t-algebra$	340/194	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Ring/InjSurj.lean,scripts/noshake.json	9	37	['MichaelStollBayreuth', 'astrainfinita', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	227-27688 7 months ago	356-42693 356 days ago	47-81764 47 days
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	223-41183 7 months ago	245-23160 245 days ago	85-42087 85 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	216-56292 7 months ago	315-27739 315 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	207-78240 6 months ago	687-30772 687 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	207-61882 6 months ago	211-70840 211 days ago	0-22091 6 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	205-82223 6 months ago	398-83804 398 days ago	0-27 27 seconds
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	204-11024 6 months ago	220-42833 220 days ago	100-20975 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	204-11023 6 months ago	230-11987 230 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	203-23376 6 months ago	231-56052 231 days ago	0-1522 25 minutes
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	200-82881 6 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	192-21467 6 months ago	273-21404 273 days ago	73-13048 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	184-15891 6 months ago	354-74664 354 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	178-11811 5 months ago	568-39360 568 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	172-3179 5 months ago	193-35269 193 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	170-44801 5 months ago	489-23297 489 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	166-71993 5 months ago	166-71993 166 days ago	148-3338 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	165-61843 5 months ago	330-42964 330 days ago	0-47835 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	154-20292 5 months ago	230-43188 230 days ago	47-20776 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	154-2693 5 months ago	200-64595 200 days ago	15-4939 15 days
14752	AntoineChambert-Loir author:AntoineChambert-Loir	fix(Topology/Algebra/Valued): repair definition of Valued	Following a [discussion on Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Question.20about.20.60Valued.2Eis_topological_valuation.60), we modify the definition of the field `is_topological_valuation` of `Valued` insisting that the element $\gamma$ showing up there is in the subgroup generated by the image of the valuation map. Co-authored-by: @faenuccio - [x] depends on: #25496	merge-conflict WIP t-topology t-algebra label:t-algebra$	1166/301	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.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/UniformSpace/AbstractCompletion.lean,docs/references.bib	12	28	['AntoineChambert-Loir', 'faenuccio', 'github-actions', 'jcommelin', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	nobody	147-1292 4 months ago	305-12173 305 days ago	1-33784 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	139-79036 4 months ago	559-20024 559 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	139-62010 4 months ago	727-20176 727 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	139-26382 4 months ago	642-34374 642 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	139-8877 4 months ago	484-58807 484 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	138-46736 4 months ago	953-69598 953 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	138-46735 4 months ago	998-26396 998 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	138-46734 4 months ago	821-71629 821 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	138-46731 4 months ago	642-34362 642 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	138-46606 4 months ago	776-25055 776 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	138-46605 4 months ago	808-42776 808 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	138-46601 4 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	138-46600 4 months ago	587-22235 587 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	138-46599 4 months ago	669-15127 669 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	138-46475 4 months ago	600-80981 600 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	138-46472 4 months ago	669-31850 669 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	138-46470 4 months ago	588-38556 588 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	138-46468 4 months ago	559-21604 559 days ago	26-40037 26 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	138-46345 4 months ago	630-11899 630 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	138-46343 4 months ago	627-80344 627 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	138-46341 4 months ago	625-5805 625 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	138-46340 4 months ago	614-31682 614 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	138-46339 4 months ago	614-12570 614 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	138-46335 4 months ago	456-81828 456 days ago	78-5771 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	138-46184 4 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	138-46181 4 months ago	441-8741 441 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	138-46179 4 months ago	511-17513 511 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	138-46178 4 months ago	458-26408 458 days ago	43-17770 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	138-46177 4 months ago	450-17148 450 days ago	49-5112 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	138-46176 4 months ago	497-37352 497 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	138-46048 4 months ago	472-69269 472 days ago	0-334 5 minutes
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	138-46046 4 months ago	434-19830 434 days ago	23-30991 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	138-46045 4 months ago	335-78974 335 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	138-46043 4 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	138-46042 4 months ago	426-19730 426 days ago	7-42229 7 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	138-46041 4 months ago	407-65800 407 days ago	27-38491 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	138-46039 4 months ago	439-14600 439 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	138-46037 4 months ago	357-47850 357 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	138-46035 4 months ago	430-82413 430 days ago	0-668 11 minutes
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	138-46031 4 months ago	363-60273 363 days ago	50-13773 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	138-46029 4 months ago	370-40704 370 days ago	46-53123 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	138-45905 4 months ago	365-29860 365 days ago	50-8745 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	138-45899 4 months ago	385-39912 385 days ago	20-81771 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	138-45895 4 months ago	217-29176 217 days ago	158-38024 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	138-45893 4 months ago	406-62459 406 days ago	0-141 2 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	138-45892 4 months ago	406-62187 406 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	138-45890 4 months ago	404-79892 404 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	138-45883 4 months ago	138-45884 138 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	138-45877 4 months ago	366-60994 366 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	138-45875 4 months ago	367-24023 367 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	138-45873 4 months ago	312-59144 312 days ago	71-48538 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	138-45872 4 months ago	213-69679 213 days ago	0-4401 1 hour
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	138-45866 4 months ago	377-77997 377 days ago	0-21 21 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	138-45864 4 months ago	221-8236 221 days ago	65-54983 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	138-45862 4 months ago	357-415 357 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	138-45861 4 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	138-45859 4 months ago	239-56724 239 days ago	124-78303 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	138-45724 4 months ago	224-44305 224 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	138-45719 4 months ago	304-63863 304 days ago	0-20349 5 hours
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	138-45711 4 months ago	138-45712 138 days ago	177-42245 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	138-45706 4 months ago	188-65977 188 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	138-45579 4 months ago	302-30376 302 days ago	0-820 13 minutes
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	138-45212 4 months ago	274-47247 274 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	138-44878 4 months ago	217-75184 217 days ago	18-54732 18 days
21915	YaelDillies author:YaelDillies	feat: simproc for `Int.divisorsAntidiag`	Co-authored-by: Paul Lezeau --- - [x] depends on: #21912 - [x] depends on: #21991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-meta	75/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/DivisorsAntidiag.lean	3	9	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	138-32862 4 months ago	415-14843 415 days ago	0-56 56 seconds
15443	YaelDillies author:YaelDillies	feat: Marcinkiewicz-Zygmund inequality	Prove the Marcinkiewicz-Zygmund inequality. The Marcinkiewicz-Zygmund inequality states that, if `X₁, ..., Xₐ ∈ L^p` are independent random variables of mean zero valued in some inner product space, then the `L^p`-norm of `X₁ + ... + Xₐ` is at most `Cₚ` times the `L^(p/2)`-norm of `\|X₁\|² + ... + \|Xₐ\|²`, where `Cₚ` is a constant depending on `p` alone. From LeanAPAP Co-authored-by: Bhavik Mehta --- - [x] depends on: #15832 - [x] depends on: #21033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-analysis	189/0	Mathlib.lean,Mathlib/Probability/MarcinkiewiczZygmund.lean	2	40	['Parcly-Taxel', 'YaelDillies', 'b-mehta', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	138-32518 4 months ago	462-11425 462 days ago	89-28229 89 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	760/625	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2024Q5.lean,Archive/MiuLanguage/Basic.lean,Archive/Wiedijk100Theorems/BallotProblem.lean,Cache/Requests.lean,Counterexamples/PolynomialIsDomain.lean,Mathlib.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Group/Int/Even.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Group/Unbundled/Int.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/Algebra/Order/Ring/Unbundled/Rat.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/CardPowDegree.lean,Mathlib/Algebra/Polynomial/Degree/IsMonicOfDegree.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Polynomial/Factors.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/SumIteratedDerivative.lean,Mathlib/Algebra/Ring/Action/Invariant.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Algebra/Ring/Periodic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/SpreadingOut.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/AlgebraicTopology/Quasicategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Horn.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/Distribution/TemperateGrowth.lean,Mathlib/Analysis/InnerProductSpace/Projection/Basic.lean,Mathlib/Analysis/Matrix/Spectrum.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Affine/Simplex.lean,Mathlib/Analysis/Normed/Field/UnitBall.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp/Kernels.lean,Mathlib/Analysis/Normed/Module/Ball/RadialEquiv.lean,Mathlib/Analysis/Normed/Ring/Ultra.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/CategoryTheory/ConcreteCategory/UnbundledHom.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Quiver/Arborescence.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Computability/Primrec.lean,Mathlib/Control/Random.lean,Mathlib/Data/Char.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/FP/Basic.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/SuccPred.lean	297	5	['JovanGerb', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	138-18730 4 months ago	144-30961 144 days ago	0-88 1 minute
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	138-18055 4 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	138-18047 4 months ago	950-73160 950 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	138-18042 4 months ago	808-22795 808 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	138-18010 4 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	138-17995 4 months ago	822-22973 822 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	138-17989 4 months ago	735-10295 735 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	138-17983 4 months ago	642-40792 642 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	138-17976 4 months ago	642-40775 642 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	138-17953 4 months ago	788-73097 788 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	138-17945 4 months ago	767-71790 767 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	138-17911 4 months ago	613-38193 613 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	138-17904 4 months ago	613-38068 613 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	138-17889 4 months ago	623-70436 623 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	138-17884 4 months ago	700-25935 700 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	138-17880 4 months ago	710-14160 710 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	138-17851 4 months ago	640-83732 640 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	138-17840 4 months ago	633-3847 633 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	138-17805 4 months ago	539-8265 539 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	138-17798 4 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	138-17792 4 months ago	501-24671 501 days ago	15-38473 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	138-17783 4 months ago	513-42135 513 days ago	0-722 12 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	138-17778 4 months ago	405-28738 405 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	138-17768 4 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	138-17729 4 months ago	474-34978 474 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	138-17702 4 months ago	430-82916 430 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	138-17690 4 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	138-17585 4 months ago	350-16520 350 days ago	8-27909 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	138-17581 4 months ago	221-45369 221 days ago	117-82649 117 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	138-17565 4 months ago	301-48020 301 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	138-17558 4 months ago	301-47982 301 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	133-30323 4 months ago	138-45719 138 days ago	36-953 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	132-64112 4 months ago	354-72862 354 days ago	2-85335 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	130-33131 4 months ago	281-73009 281 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	122-232 4 months ago	304-26576 304 days ago	29-59355 29 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 - [x] depends on: #18534 - [x] depends on: #18527 - [x] depends on: #18440 - [ ] 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	120-21092 3 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	117-25622 3 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', 'leanprover-community-mathlib4-bot']	nobody	116-19392 3 months ago	963-3734 963 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	109-43557 3 months ago	422-82127 422 days ago	2-69252 2 days
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	101-5373 3 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	101-5270 3 months ago	1030-76400 1030 days ago	0-753 12 minutes
6042	MohanadAhmed author:MohanadAhmed	feat(LinearAlgebra/Matrix/SVD): Singular Value Decomposition of R or C Matrices	This file provides proves the SVD theorem which decomposes a real/complex matrix into left eigenvectors, singular values block diagonal matrix and right eigenvectors. Any matrix A (M × N) with rank r = A.rank and with elements in ℝ or ℂ fields can be decompsed into the product of three matrices: $$A = USV$$ * The three matrices are defined as - $U$: an M × M matrix containing the left eigenvectors of the matrix - $S$: an M × N matrix with an r × r block in the upper left corner with nonzero singular values - $V$: an N × N matrix containing the right eigenvectors of the matrix Note that * $S$ is a block matrix $S = [S₁₁, S₁₂; S₂₁, S₂₂]$ with - $S₁₁$: a diagonal r × r matrix and - $S₁₂$ : r × (N - r) zero matrix, S₂₁ : (M - r) × r zero matrix and - $S₂₂$: (M - r) × (N - r) zero matrix * $U$ is a block column matrix U = [U₁ U₂] with - $U₁$ : a M × r containing left eigenvectors with nonzero singular values. - $U₂$ : a M × (M - r) containing left eigenvectors with zero singular values. * $V$ is a block column matrix V = [V₁ V₂] with - $V₁$ : a N × r containing right eigenvectors with nonzero singular values. - $V₂$ : a M × (M - r) containing right eigenvectors with zero singular values. Since in mathlib the eigenvalues of hermitian matrices are defined in an "arbitrary" undetermined order, we begin by partition the singular values into zero and non-zero values. We partition the corresponding eigenvectors from AᴴA and AAᴴ using similar rearrangements. These are included in `SVD.svdReindex`. The basic API for Column and Row partitioned matrices is from `ColumnRowPartitioned`. We then proceed to transfer some of the lemmas we need about eigenvector matrices (for example that they are unitary: i.e. inverse is conjugate transpose.). Note that since invertibility in mathlib is defined for square matrices while our matrices are partitioned i.e. N × (N₁ ⊕ N₂) and N ≃ (N ⊕ N₂), Lean cannot apply the Invertible definition. We workaround this were necessary. Lemma `reduced_spectral_theorem` (`reduced_spectral_theorem'`) shows that AᴴA and AAᴴ, can be reduced to products containing only the non-zero singular eigenvectors. This is later used in proving the main SVD theroem. A few lemmas are provided about the invertibility of the non-zero singular values matrix: `svdσ_inv`, `σ_inv_μ_σ_inv_eq_one`, `IsUnit_det_svdσ`, `IsUnit_det_svdσ_mapK` and `svdσ_inv_mapK`. To make relating left eigenvectors to right eigenvectors easier we define U₁ = AV₁σ⁻¹ while U₂ is obtained from the eigenvectors of (AAᴴ). This avoid a lengthy reindexing operation with many proofs. The vectors in U₂ have no such issue since they are multiplied by zero singular values anyway. Co-authored-by: Mohanad Ahmed --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP t-algebra merge-conflict label:t-algebra$	588/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean	3	116	['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel', 'vihdzp']	nobody	101-4900 3 months ago	783-5188 783 days ago	197-21527 197 days
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	101-1245 3 months ago	1044-21086 1044 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	8	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	99-16490 3 months ago	248-25641 248 days ago	56-85445 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	98-66061 3 months ago	629-81465 629 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	98-53469 3 months ago	204-77527 204 days ago	0-6833 1 hour
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	94-83630 3 months ago	95-10544 95 days ago	0-121 2 minutes
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	93-68484 3 months ago	221-12597 221 days ago	43-1605 43 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	91-80461 3 months ago	426-76984 426 days ago	0-2312 38 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	91-1476 3 months ago	538-48713 538 days ago	9-73631 9 days
13740	YaelDillies author:YaelDillies	feat: more robust ae notation	Make sure that, when `μ : FiniteMeasure Ω`, `f =ᵐ[μ] g` elaborates to `f =ᵐ[↑μ] g` instead of complaining about `OuterMeasureClass (FiniteMeasure Ω) (Set Ω) ℝ≥0∞` not existing. [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/ae.20of.20a.20finite.20measure) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta t-measure-probability awaiting-author	67/8	Mathlib/MeasureTheory/Integral/Bochner/L1.lean,Mathlib/MeasureTheory/Measure/Decomposition/IntegralRNDeriv.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/OuterMeasure/BorelCantelli.lean,Mathlib/Probability/Notation.lean	6	41	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'thorimur', 'urkud']	RemyDegenne and thorimur assignee:RemyDegenne assignee:thorimur	90-597 3 months ago	90-649 90 days ago	62-16320 62 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	88-26106 2 months ago	358-1151 358 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	86-43831 2 months ago	90-9359 90 days ago	0-3399 56 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	['leanprover-community-mathlib4-bot', 'urkud']	nobody	84-58277 2 months ago	669-32345 669 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	84-58184 2 months ago	689-27609 689 days ago	1-73101 1 day
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	80-17078 2 months ago	150-23550 150 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	80-7008 2 months ago	563-57277 563 days ago	7-13967 7 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', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	69-84851 2 months ago	690-85845 690 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	68-71729 2 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	65-61116 2 months ago	275-59340 275 days ago	72-50365 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	64-80916 2 months ago	355-72148 355 days ago	0-1017 16 minutes
24000	YaelDillies author:YaelDillies	feat: correspondence between affine group schemes and Hopf algebras	Construct `Spec` as a functor from `R`-Hopf algebras to group schemes over `Spec R`, show it is full and faithful and has affine group schemes as essential image. From Toric, FLT Co-authored-by: Andrew Yang Co-authored-by: Michał Mrugała Co-authored-by: Christian Merten --- - [ ] depends on: #34675 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry toric FLT blocked-by-other-PR	127/0	Mathlib/AlgebraicGeometry/GroupScheme/HopfAffine.lean	1	4	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot']	nobody	64-33296 2 months ago	358-29429 358 days ago	0-1 1 second
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	64-25667 2 months ago	275-58166 275 days ago	29-66856 29 days
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	64-25610 2 months ago	81-40295 81 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	64-25354 2 months ago	157-7369 157 days ago	0-64677 17 hours
19860	YaelDillies author:YaelDillies	refactor: review the `simps` projections of `OneHom`, `MulHom`, `MonoidHom`	Make `simps` generate `coe_concreteHom` rather than`concreteHom_apply`. From FLT --- In fact, I would love to have both the `coe_` and `_apply` projections simultaneously and also to not have to specify ` simps (config := .asFn))` every single time we want to generate the `coe_` projection, but `simps ` seems to not be able to do that? cc @fpvandoorn I must say, after four years of working on mathlib, I still don't understand how one is supposed to use `simps`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP t-algebra label:t-algebra$	100/123	Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/WithOne/Basic.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Module/End.lean,Mathlib/GroupTheory/NoncommCoprod.lean	8	12	['fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	61-17162 2 months ago	482-33725 482 days ago	0-17 17 seconds
21031	YaelDillies author:YaelDillies	chore: get rid of generic hom coercions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	166/161	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Map.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean	12	18	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'urkud']	Vierkantor assignee:Vierkantor	61-17075 2 months ago	437-967 437 days ago	0-17 17 seconds
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	56-38570 1 month ago	275-61811 275 days ago	52-61657 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	55-31151 1 month ago	496-19419 496 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	54-84449 1 month ago	301-48007 301 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	53-6590 1 month ago	53-6591 53 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	50-61679 1 month ago	384-38179 384 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	50-61679 1 month ago	381-41170 381 days ago	0-67928 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	50-61678 1 month ago	382-21844 382 days ago	0-801 13 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	50-44750 1 month ago	458-32266 458 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	50-22137 1 month ago	699-21337 699 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	50-21965 1 month 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	48-76832 1 month 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	47-74968 1 month ago	139-40737 139 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	47-74965 1 month ago	82-23536 82 days ago	0-546 9 minutes
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 awaiting-author merge-conflict	200/58	Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/SetTheory/Cardinal/ContinuumHypothesis.lean	3	21	['b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-merge-conflicts', 'plp127', 'vihdzp']	nobody	47-51291 1 month ago	79-55287 79 days ago	0-76 1 minute
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	43-56317 1 month ago	690-40196 690 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	39-39279 1 month ago	385-17218 385 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	39-39263 1 month ago	336-21157 336 days ago	39-61332 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	38-59292 1 month ago	303-2191 303 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	38-23590 1 month ago	327-6062 327 days ago	17-16443 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	35-8959 1 month 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	35-7364 1 month ago	251-75030 251 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	31-73274 1 month ago	45-14051 45 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	15/1	Mathlib/Data/Fintype/Option.lean	1	3	['github-actions', 'joneugster']	joneugster assignee:joneugster	31-39787 1 month ago	66-20130 66 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	31-29331 1 month ago	871-6705 871 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	31-29303 1 month ago	511-20409 511 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	31-29280 1 month ago	623-81704 623 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	31-29261 1 month ago	606-7431 606 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	31-29249 1 month ago	291-28988 291 days ago	91-69159 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	31-29232 1 month ago	502-69867 502 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	31-10290 1 month ago	unknown	0-0 0 seconds
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	25-56164 25 days ago	602-16603 602 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	25-39057 25 days ago	805-10545 805 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	25-39024 25 days ago	789-22465 789 days ago	0-1135 18 minutes
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	23-14043 23 days ago	602-43417 602 days ago	0-1791 29 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	23-14031 23 days ago	521-34662 521 days ago	29-26213 29 days
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	23-14019 23 days ago	351-45413 351 days ago	56-56728 56 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	23-14007 23 days ago	332-37303 332 days ago	72-3718 72 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	23-13993 23 days ago	313-63096 313 days ago	19-33859 19 days
24373	YaelDillies author:YaelDillies	refactor: golf `modularCharacter`	... using the lessons learned from `distribHaarChar`. Unfortunately, the two setups can't quite be unified because we are lacking an additive version of `MulDistribMulAction`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-measure-probability	77/45	Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Group/ModularCharacter.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean	5	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	22-15666 22 days ago	unknown	0-0 0 seconds
21342	YaelDillies author:YaelDillies	refactor(Normed/Group/Quotient): generalise to non-abelian groups	The goal is to apply this to free groups, whose multiplication in either argument is an isometry, but isn't commutative. --- - [x] depends on: #21341 - [ ] depends on: #35037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	97/70	Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Bornology/BoundedOperation.lean	6	12	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	22-15431 22 days ago	22-14951 22 days ago	11-70695 11 days
19475	YaelDillies author:YaelDillies	feat: group markings	From LeanCamCombi --- - [ ] depends on: #21342 [![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$	270/70	Mathlib.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Geometry/Group/Marking.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean,Mathlib/Topology/Bornology/BoundedOperation.lean	8	16	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	22-15390 22 days ago	430-16476 430 days ago	22-16818 22 days
32305	faenuccio author:faenuccio	feat: define Sobolev Spaces	Nothing to see yet. --- - [ ] depends on: #32250 - [ ] depends on: #31809 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP t-analysis large-import blocked-by-other-PR	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	7	['ADedecker', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-16816 19 days ago	126-26511 126 days ago	0-2 2 seconds
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$	64/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	1	['github-actions']	nobody	19-4179 19 days ago	19-2684 19 days ago	0-3566 59 minutes
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	18-31160 18 days ago	44-80770 44 days ago	0-114 1 minute
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	17-1597 17 days ago	247-25584 247 days ago	15-64386 15 days
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	16-26000 16 days ago	205-36661 205 days ago	0-104 1 minute
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	16-25995 16 days ago	424-30784 424 days ago	0-200 3 minutes
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	14-31383 14 days ago	14-31394 14 days ago	32-12136 32 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	317/17	Mathlib/Tactic/DefEqAbuse.lean,Mathlib/Tactic/FastInstance.lean,MathlibTest/CheckInstance.lean,MathlibTest/DefEqAbuse.lean	4	42	['JovanGerb', 'Vierkantor', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib-merge-conflicts', 'ocfnash']	Vierkantor assignee:Vierkantor	13-35217 13 days ago	14-8928 14 days ago	6-60386 6 days
37013	kim-em author:kim-em	feat(Tactic/Linter): add instance diamond linter	This PR adds a linter that checks instance declarations for non-defeq diamonds in the typeclass hierarchy. For each instance whose return type is a class with multiple parents, the linter finds common ancestors reachable via different parent paths and checks that the projection paths yield definitionally equal results at `reducible_and_instances` transparency. The diagnostic output includes: - Root-cause filtering: only the most primitive failing ancestor is reported (e.g. `SubNegMonoid` rather than `AddGroup`, since the latter's failure is a consequence of the former's) - Differing fields: which fields of the ancestor class are non-defeq between the two paths - Divergence values: the whnf'd parent structures at the point of divergence, showing e.g. `zsmul := Ring.zsmul` vs `zsmul := AddGroupWithOne.zsmul` - Example statements: copy-pasteable `example : ... := by with_reducible_and_instances rfl` that demonstrate each failure The "Differing fields" lhs/rhs comparison currently shows the parent structure containing the differing field, rather than the field value itself. Improvements to this display are welcome in subsequent PRs. The linter is enabled by default. It currently fires on ~38 instances in Mathlib, mostly involving the `Ring`/`AddGroupWithOne`/`AddCommGroup` hierarchy — so CI will fail until those are addressed. 🤖 Prepared with Claude Code	t-linter large-import	361/0	Mathlib/Init.lean,Mathlib/Tactic/Linter/InstanceDiamond.lean,MathlibTest/Linter/InstanceDiamond.lean	3	1	['github-actions']	nobody	12-68397 12 days ago	12-65390 12 days ago	0-18324 5 hours
24383	YaelDillies author:YaelDillies	feat: distributive Haar characters of `ℝ` and `ℂ`	Compute `distribHaarChar` in the case of the actions of `ℝˣ` on `ℝ` and of `ℂˣ` on `ℂ`. The file I'm moving was added two days ago and is not yet used in FLT. From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP awaiting-CI t-measure-probability file-removed FLT	211/80	Mathlib.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/Group/Action/BigOperators.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Basic.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Complex.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar/Real.lean,Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	8	28	['YaelDillies', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	12-26259 12 days ago	334-40871 334 days ago	0-12994 3 hours
36426	kim-em author:kim-em	chore: disable checkType env_linter	This PR disables the `checkType` env_linter, which takes ~44% of total linting time to type-check every declaration statement. This is redundant since all declarations are already type-checked when added to the environment, and external kernel checkers (lean4checker, trepplein) verify Mathlib regularly. No one on Zulip recalls ever seeing it fire in practice. 🤖 Prepared with Claude Code	LLM-generated t-linter awaiting-author	8/0	Mathlib/Init.lean	1	3	['JovanGerb', 'Vierkantor', 'github-actions']	alexjbest assignee:alexjbest	11-12709 11 days ago	11-12709 11 days ago	16-43405 16 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	10-84039 10 days ago	121-23855 121 days ago	1-301 1 day
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	10-80609 10 days ago	11-6642 11 days ago	0-588 9 minutes
37073	kim-em author:kim-em	feat: add normalize_instance% using core's normalizeInstance	This PR adds a new `normalize_instance%` term elaborator that delegates to Lean core's `normalizeInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `normalize_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.normalizeInstance`. 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	merge-conflict	88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/Order/Ring/StandardPart.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/NumberTheory/NumberField/InfiniteAdeleRing.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	18	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	10-59899 10 days ago	10-59900 10 days ago	2-73508 2 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	10-37049 10 days ago	259-84675 259 days ago	88-84229 88 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	10-36498 10 days ago	325-15203 325 days ago	43-17409 43 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	9-84960 9 days ago	21-62665 21 days ago	0-1003 16 minutes
37038	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: #37037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	443/0	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-39498 7 days ago	14-23072 14 days ago	0-1312 21 minutes
36072	erdOne author:erdOne	feat(AlgebraicGeometry): essential smallness of affine schemes locally of finite type over a base	Co-authored-by: Joël Riou --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated awaiting-author	151/2	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	6	7	['WilliamCoram', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca']	nobody	6-26167 6 days ago	32-16590 32 days ago	1-79945 1 day
37349	kim-em author:kim-em	feat(Analysis/Polynomial/MahlerMeasure): Landau's inequality and Mignotte bound	This PR extracts Landau's inequality as a standalone theorem and adds the Mignotte coefficient bound for polynomial factors. Landau's inequality (`mahlerMeasure_le_sqrt_sum_sq_norm_coeff`) states that the Mahler measure of a polynomial is at most `√(∑ ‖coeff i‖²)`. This was previously buried as an intermediate step inside the proof of `mahlerMeasure_le_sqrt_natDegree_add_one_mul_supNorm`, which is now a short corollary. The Mignotte bound (`norm_coeff_le_choose_mul_mahlerMeasure_mul`) says that if `f = g * h` with `M(h) ≥ 1`, then `‖g.coeff n‖ ≤ C(deg g, n) · M(f)`. The hypothesis `M(h) ≥ 1` holds in particular for nonzero integer polynomials (via `one_le_mahlerMeasure`, also added here). This is the classical bound used in Berlekamp–Zassenhaus polynomial factorization. New declarations: - `one_le_mahlerMeasure` - `mahlerMeasure_le_sqrt_sum_sq_norm_coeff` - `le_mahlerMeasure_mul_right` / `le_mahlerMeasure_mul_left` - `norm_coeff_le_choose_mul_mahlerMeasure_mul` The ℓ² norm is stated explicitly as `√(∑ i ∈ p.support, ‖p.coeff i‖ ^ 2)` with a TODO to restate using a dedicated polynomial ℓ² norm once one is defined (cf. the TODO in `Mathlib.Analysis.Polynomial.Norm`). 🤖 Prepared with [Claude Code](https://claude.ai/code)	t-analysis	58/20	Mathlib/Analysis/Polynomial/MahlerMeasure.lean	1	3	['github-actions', 'khwilson', 'mathlib-bors']	j-loreaux assignee:j-loreaux	5-69448 5 days ago	7-68973 7 days ago	7-69267 7 days
37454	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/Topology/Category/LightProfinite/Limits.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017310641) by @dagurtomas.	t-topology	7/0	Mathlib/Topology/Category/LightProfinite/Limits.lean	1	1	['github-actions']	PatrickMassot assignee:PatrickMassot	5-69439 5 days ago	6-10311 6 days ago	6-10301 6 days
35533	mariainesdff author:mariainesdff	feat(RingTheory/DedekindDomain/Ideal/Lemmas): add nontrivial_heightOneSpectrum	Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	12/0	Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean	1	5	['Multramate', 'erdOne', 'github-actions', 'mariainesdff', 'tb65536']	chrisflav assignee:chrisflav	5-28123 5 days ago	33-41118 33 days ago	39-68253 39 days
36582	kim-em author:kim-em	feat: run inferInstanceAs% normalization when deriving	This PR intercepts `def ... deriving ...` and `deriving instance ... for ...` commands that use the delta deriving handler, and runs the `normalizeInstance` machinery from `inferInstanceAs%` on the synthesized instances. This fixes carrier type leakage at `reducibleAndInstances` transparency for all delta-derived instances across Mathlib. The implementation copies `mkInst` and `processDefDeriving` from `Lean.Elab.Deriving.Basic` (Lean 4.29.0-rc6) and adds the normalization step. This is intentionally a temporary copy: once we settle on the right behavior, it will be upstreamed into Lean 4. - [ ] depends on: #35950 🤖 Prepared with Claude Code	large-import LLM-generated	353/3	Mathlib/Init.lean,Mathlib/Tactic/DerivingInferInstanceAs.lean,Mathlib/Tactic/InferInstanceAsPercent.lean,MathlibTest/DerivingInferInstanceAs.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-51316 4 days ago	24-58422 24 days ago	0-218 3 minutes
36423	kim-em author:kim-em	perf: decompress already-cached files concurrently with downloads	This PR builds on https://github.com/leanprover-community/mathlib4/pull/32987 (pipeline downloads and decompression) and https://github.com/leanprover-community/mathlib4/pull/36367 (fix: decompress already downloaded files). Previously, already-cached `.ltar` files were only decompressed after all downloads completed, in the final `unpackCache` sweep. This PR starts decompressing them concurrently with downloads by spawning `leantar` as a background task before the download phase begins. The two decompression paths operate on disjoint file sets (pre-cached vs newly downloaded), so there is no conflict. In the common case where a user has most files cached but a few hundred to download, this overlaps several seconds of decompression with network I/O. 🤖 Prepared with Claude Code	LLM-generated CI t-meta	73/26	Cache/IO.lean,Cache/Requests.lean	2	4	['github-actions', 'joneugster', 'kim-em']	joneugster assignee:joneugster	4-50363 4 days ago	4-50687 4 days ago	24-2396 24 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 awaiting-author	163/0	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	3	['github-actions', 'mathlib-merge-conflicts', 'thorimur']	dwrensha and thorimur assignee:dwrensha assignee:thorimur	3-68760 3 days ago	3-68760 3 days ago	16-84611 16 days
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	3-33692 3 days ago	724-17078 724 days ago	0-1223 20 minutes
36434	mariainesdff author:mariainesdff	feat(RingTheory.DividedPowerAlgebra.Init.lean): add weak universal property and functoriality	Co-authored by @AntoineChambert-Loir. --- - [x] depends on: #35804 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	216/2	Mathlib/RingTheory/DividedPowerAlgebra/Init.lean	1	18	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	nobody	3-22410 3 days ago	3-22410 3 days ago	3-31976 3 days
37037	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add lemmas	Co-authored by: @AntoineChambert-Loir. --- - [x] depends on: #36444 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	68/0	Mathlib/RingTheory/PowerSeries/Substitution.lean	1	9	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'robin-carlier']	chrisflav assignee:chrisflav	3-20828 3 days ago	3-20828 3 days ago	4-43292 4 days
37434	mariainesdff author:mariainesdff	feat(Algebra/Group/Submonoid/Basic): add lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/0	Mathlib/Algebra/Group/Submonoid/Basic.lean	1	3	['FernandoChu', 'github-actions', 'j-loreaux', 'robin-carlier']	nobody	3-10454 3 days ago	3-10454 3 days ago	3-18550 3 days
37398	eric-wieser author:eric-wieser	chore: lemmas about `Matrix.submatrix` and `Matrix.kroneckerMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra easy label:t-algebra$	17/0	Mathlib/LinearAlgebra/Matrix/Kronecker.lean	1	2	['github-actions', 'themathqueen']	nobody	2-85785 2 days ago	6-63244 6 days ago	0-1128 18 minutes
37451	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017307958) by @dagurtomas.	t-category-theory delegated	21/0	Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean	1	10	['erdOne', 'github-actions', 'mathlib-bors', 'riccardobrasca', 'robin-carlier']	robin-carlier assignee:robin-carlier	2-14293 2 days ago	2-14521 2 days ago	3-82227 3 days
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 label:t-algebra$	27/0	Mathlib/Algebra/BigOperators/NatAntidiagonal.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	1-69627 1 day ago	6-29279 6 days ago	6-29269 6 days
37437	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$	307/19	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	1-69626 1 day ago	6-27288 6 days ago	6-27278 6 days
37438	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	602/22	Mathlib/Algebra/SkewPolynomial/Basic.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	1-69625 1 day ago	6-26698 6 days ago	6-26688 6 days
37452	mathlib-splicebot author:mathlib-splicebot	chore(Mathlib/Condensed/Light/Epi.lean): automated extraction	This PR was automatically created from PR #37449 by @dagurtomas via a [review comment](https://github.com/leanprover-community/mathlib4/pull/37449#discussion_r3017308832) by @dagurtomas.	t-condensed delegated	19/0	Mathlib/Condensed/Light/Epi.lean	1	3	['github-actions', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1-44647 1 day ago	1-44647 1 day ago	4-52097 4 days
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	55/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-30946 1 day ago	334-3135 334 days ago	0-1 1 second
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 merge-conflict	83/0	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	19	['github-actions', 'leanprover-radar', 'mathlib-merge-conflicts', 'thorimur']	thorimur assignee:thorimur	1-28675 1 day ago	2-80307 2 days ago	1-60149 1 day
35518	kim-em author:kim-em	chore: forbid prime (') in filenames, rename LinearCombination'	This PR renames `Mathlib/Tactic/LinearCombination'.lean` to `LinearCombinationPrime.lean` (and the corresponding test file), and adds a lint check to `modulesOSForbidden` to prevent future files with prime/apostrophe characters in their names. The `'` character in filenames causes shell escaping issues in scripts (any `find ... -name '*.lean'` or similar pattern needs careful quoting to handle these files correctly). 🤖 Prepared with Claude Code	file-removed t-meta LLM-generated merge-conflict	13/8	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/LinearCombinationPrime.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,MathlibTest/linear_combination_prime.lean	6	8	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'mathlib-merge-conflicts']	dwrensha assignee:dwrensha	1-20109 1 day ago	1-20109 1 day ago	25-42954 25 days
25273	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 [![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$	1547/1670	Mathlib/Algebra/FreeAlgebra/Cardinality.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/Analysis/Fourier/BoundedContinuousFunctionChar.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/FieldTheory/Finite/Polynomial.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Univ.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/Height/MvPolynomial.lean,Mathlib/RepresentationTheory/Action.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Equiv.lean,Mathlib/RingTheory/Coalgebra/MonoidAlgebra.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/Expand.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/IntegralClosure.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean	82	97	['JovanGerb', 'YaelDillies', 'alreadydone', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib4-merge-conflict-bot']	nobody	1-18396 1 day ago	276-34499 276 days ago	36-61320 36 days
34131	Ruben-VandeVelde author:Ruben-VandeVelde	fix: update create_deprecated_modules.lean	--- This is a wip; I'm hoping someone can pick it up and make sure CI builds it going forward. @adomani @kim-em any takers? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	please-adopt WIP CI	26/22	scripts/create_deprecated_modules.lean	1	4	['adomani', 'bryangingechen', 'github-actions', 'grunweg']	nobody	1-12530 1 day ago	77-32022 77 days ago	0-1 1 second
35535	mariainesdff author:mariainesdff	feat(RingTheory/ClassGroup): prove mulEquiv	We prove that isomorphic rings have isomorphic class groups. Co-authored by: @xgenereux. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	233/9	Mathlib/Algebra/Ring/CompTypeclasses.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/IntegralClosure/IsIntegral/Basic.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean	6	29	['erdOne', 'eric-wieser', 'github-actions', 'mariainesdff', 'mathlib-merge-conflicts', 'tb65536']	jcommelin assignee:jcommelin	0-69661 19 hours ago	31-19260 31 days ago	38-63745 38 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
35576	Tehlikeli107 author:Tehlikeli107	⚡ [performance] Pre-compile regexes in lake-build-wrapper.py	- Pre-compile `file_info_re` and `progress_re` in `BuildOutputProcessor.__init__` to avoid repeated compilation overhead. - Replace `re.sub(r'\.', '/', target)` with `target.replace('.', '/')` for better performance when converting module names to file paths. These changes result in a measured ~40% performance improvement in the core processing logic of the wrapper script. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-author CI new-contributor merge-conflict	8/707	scripts/bench/README.md,scripts/bench/build/README.md,scripts/bench/build/fake-root/bin/lean,scripts/bench/build/fake-root/bin/lean.py,scripts/bench/build/lakeprof_report_template.html,scripts/bench/build/lakeprof_report_upload.py,scripts/bench/build/run,scripts/bench/combine.py,scripts/bench/lint/README.md,scripts/bench/lint/run,scripts/bench/measure.py,scripts/bench/open-mathlib/README.md,scripts/bench/open-mathlib/run,scripts/bench/repeatedly.py,scripts/bench/run,scripts/bench/size/README.md,scripts/bench/size/run,scripts/bench/size/run.py,scripts/lake-build-wrapper.py	19	7	['bryangingechen', 'felixpernegger', 'github-actions', 'grunweg', 'mathlib-merge-conflicts']	nobody	34-39540 1 month ago	45-5813 45 days ago	0-8924 2 hours
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	25-74766 25 days ago	25-74492 25 days ago	0-364 6 minutes
37059	thorimur author:thorimur	review: #36709	This review suggests - various improvements to the code structure + readability; pruning of unnecessary code - using `withCurrHeartbeats` instead of setting max heartbeats to 0 (and nothing at all in the `elabCommand` case, which should effectively start heartbeats afresh anyway) - not re-throwing `.internal` errors (does not touch unmodified sections of code that do the same) - hovers on names in the logged message + message newline fixes - another test, this time at the command level - `Name.lt` instead of `.quickLt` for human-readable sorting --- Targeting: https://github.com/leanprover-community/mathlib4/pull/36709 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	77/66	Mathlib/Tactic/DefEqAbuse.lean,MathlibTest/DefEqAbuse.lean	2	3	['SnirBroshi', 'github-actions', 'thorimur']	kim-em assignee:kim-em	10-24335 10 days ago	13-84073 13 days ago	13-84740 13 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	33/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/EdgeConnectivity.lean	1	5	['github-actions', 'grunweg', 'themathqueen']	nobody	7-42188 7 days ago	10-11406 10 days ago	0-432 7 minutes
37038	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: #37037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	443/0	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	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-39498 7 days ago	14-23072 14 days ago	0-1312 21 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	393/1	Mathlib.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/ScottTopologyDCPO.lean,docs/references.bib	4	4	['github-actions', 'mathlib-dependent-issues']	nobody	4-13124 4 days ago	4-13125 4 days ago	0-1300 21 minutes
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 label:t-algebra$	336/0	Mathlib/Algebra/Lie/Sl2.lean	1	8	['github-actions', 'mathlib-bors', 'mathlib-merge-conflicts', 'ocfnash', 'pion2024']	ocfnash assignee:ocfnash	1-32234 1 day ago	5-16536 5 days ago	2-57577 2 days

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
36163	mcdoll author:mcdoll	feat(Analysis/SpecialFunctions): `rpow` is locally integrable	Local integrability of real powers. This is only of interest at the origin, where `‖x‖ ^ (-α)` is not bounded. Co-authored-by: Michael Douglas --- From https://github.com/mrdouglasny/OSforGFF and made mathlib ready by me [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	71/0	Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/MeasureTheory/Constructions/HaarToSphere.lean	2	4	['github-actions', 'j-loreaux']	nobody	24-82037 24 days ago	24-82037 24 days ago	7-77804 7 days
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/)		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	3	['github-actions', 'j-loreaux', 'leanprover-radar']	nobody	19-5376 19 days ago	19-5652 19 days ago	0-616 10 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/)		56/61	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	5	4	['JovanGerb', 'github-actions', 'linesthatinterlace']	nobody	18-21352 18 days ago	18-17721 18 days ago	0-11097 3 hours
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	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	17-83105 17 days ago	18-42035 18 days ago	0-1289 21 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	245/10	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	7	7	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	17-166 17 days ago	59-32671 59 days ago	0-10 10 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	353/15	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	8	10	['github-actions', 'mathlib-merge-conflicts', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-47017 16 days ago	173-28155 173 days ago	0-13 13 seconds
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	184/8	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	16-42453 16 days ago	31-19644 31 days ago	0-8 8 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	16-42452 16 days ago	28-9602 28 days ago	0-264 4 minutes
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	14-41941 14 days ago	14-42742 14 days ago	0-83 1 minute
37026	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Data/Nat/Perm): add two lemmas	If a finite type has at most two elements, then its permutation group is cyclic and commutative. --- - [x] depends on: #36983 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	34/1	Mathlib/Data/Finite/Perm.lean	1	3	['github-actions', 'mathlib-dependent-issues', 'tb65536']	nobody	12-21373 12 days ago	12-21383 12 days ago	13-83653 13 days
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	534/15	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	6	6	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	12-16673 12 days ago	35-13059 35 days ago	0-316 5 minutes
37073	kim-em author:kim-em	feat: add normalize_instance% using core's normalizeInstance	This PR adds a new `normalize_instance%` term elaborator that delegates to Lean core's `normalizeInstance` (from https://github.com/leanprover/lean4/pull/12897), and replaces ~53 `fast_instance%` call sites where the replacement is safe. `normalize_instance%` is a thin wrapper (~15 lines) around `Lean.Meta.normalizeInstance`. 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	merge-conflict	88/59	Mathlib/Algebra/Algebra/TransferInstance.lean,Mathlib/Algebra/Module/Congruence/Defs.lean,Mathlib/Algebra/Order/Ring/StandardPart.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/NumberTheory/NumberField/InfiniteAdeleRing.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	18	7	['JovanGerb', 'github-actions', 'kim-em', 'leanprover-radar', 'mathlib-merge-conflicts']	nobody	10-59899 10 days ago	10-59900 10 days ago	2-73508 2 days
37267	xroblot author:xroblot	feat(NumberTheory/NumberField/Cyclotomic): cardinality of the subgroup of characters associated to an intermediate field equals its degree	New main result : `card_intermediateFieldEquivSubgroupChar`: the cardinality of the subgroup of Dirichlet characters of level `n` associated to an intermediate field `F` of `ℚ(ζₙ)/ℚ` equals the degree `[F : ℚ]`. --- - [ ] depends on: #34571 - [ ] depends on: #37108 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR large-import	145/2	Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/FieldTheory/Normal/Defs.lean,Mathlib/GroupTheory/FiniteAbelian/Duality.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/NumberTheory/MulChar/Duality.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Galois.lean	6	2	['github-actions', 'mathlib-dependent-issues']	riccardobrasca assignee:riccardobrasca	10-33722 10 days ago	10-37174 10 days ago	0-47 47 seconds
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	1329/228	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/fun_prop2.lean,MathlibTest/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	24	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-29119 10 days ago	11-9430 11 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	1711/252	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/fun_prop2.lean,MathlibTest/fun_prop_dev.lean,MathlibTest/fun_prop_dev_out_param.lean	46	2	['github-actions', 'mathlib-dependent-issues']	nobody	10-21200 10 days ago	10-30333 10 days ago	0-350 5 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	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	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-13830 10 days ago	21-21616 21 days ago	0-48 48 seconds
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	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	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	10-9996 10 days ago	14-34745 14 days ago	0-323 5 minutes
35976	Phelixh author:Phelixh	feat: add add Liu's uncertainty theory foundations (core/distribution/process modules)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	2374/0	Mathlib.lean,Mathlib/Uncertainty/Base.lean,Mathlib/Uncertainty/BaseCore.lean,Mathlib/Uncertainty/BaseDistribution.lean,Mathlib/Uncertainty/BaseProcess.lean,Mathlib/Uncertainty/Uncertainty.lean	6	26	['Phelixh', 'copilot-pull-request-reviewer', 'github-actions']	nobody	8-22351 8 days ago	8-22418 8 days ago	8-27705 8 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	54/1	Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/Topology/Instances/Matrix.lean	3	59	['SnirBroshi', 'eric-wieser', 'github-actions', 'hakii6', 'wwylele']	nobody	7-75748 7 days ago	9-78716 9 days ago	14-69931 14 days
36419	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/DividedPowerAlgebra/Init): add a computation lemma	Add a lemma `DividedPowerAlgebra.pow_dp`. Co-authored with: @mariainesdff --- - [x] depends on: #35804 - [ ] depends on: #35830 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	128/1	Mathlib/Data/List/ToFinsupp.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RingTheory/DividedPowerAlgebra/Init.lean	3	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	7-34885 7 days ago	27-77480 27 days ago	0-1764 29 minutes
36072	erdOne author:erdOne	feat(AlgebraicGeometry): essential smallness of affine schemes locally of finite type over a base	Co-authored-by: Joël Riou --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	delegated awaiting-author	151/2	Mathlib.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/Ring/Small.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean	6	7	['WilliamCoram', 'github-actions', 'joelriou', 'mathlib-bors', 'riccardobrasca']	nobody	6-26167 6 days ago	32-16590 32 days ago	1-79945 1 day
35790	Brian-Nugent author:Brian-Nugent	feat(CategoryTheory/AlgebraicGeometry): Flasque Sheaves have vanishing cohomology	Proves cohomology vanishing for flasque sheaves. The contents of `ZeroOutside.lean` is essentially an ad hoc proof that injective sheaves of abelian groups are flasque. The most principled way of proving this would likely be to formalize all of the following: 1. Extension by zero for sheaves of modules. 2. Injective sheaves of modules on a topological space are flasque. 3. Show that the forgetful functor from sheaves of `constant sheaf ℤ` modules to sheaves of abelian groups is an equivalence of categories. 2 and 3 are likely not that hard (I wouldn't be surprised if 3 was in mathlib in some more general form) but doing 1 correctly I think would be quite tricky. I'm not sure what the usual mathlib protocol is for this kind of thing but I propose that this ad hoc method is left in the file `ZeroOutside.lean` to make it easy to swap out when the necessary general machinery is developed to replace it (I could make the definitions in that file private if that would help guarantee it is not build off of). This is so more results on sheaf cohomology can be developed in the meantime. --- - [ ] 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	601/4	Mathlib.lean,Mathlib/Algebra/Category/Grp/ForgetCorepresentable.lean,Mathlib/Algebra/Homology/ShortComplex/Exact.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/Sheaf.lean,Mathlib/Topology/Sheaves/ZeroOutside.lean	10	9	['Brian-Nugent', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'smorel394']	dagurtomas assignee:dagurtomas	6-6753 6 days ago	39-69782 39 days ago	0-23 23 seconds
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	96/12	Mathlib/Geometry/Convex/Cone/Pointed.lean	1	51	['artie2000', 'github-actions', 'martinwintermath', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	5-77212 5 days ago	5-77213 5 days ago	17-606 17 days
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	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	5-4524 5 days ago	7-33506 7 days ago	0-629 10 minutes
36582	kim-em author:kim-em	feat: run inferInstanceAs% normalization when deriving	This PR intercepts `def ... deriving ...` and `deriving instance ... for ...` commands that use the delta deriving handler, and runs the `normalizeInstance` machinery from `inferInstanceAs%` on the synthesized instances. This fixes carrier type leakage at `reducibleAndInstances` transparency for all delta-derived instances across Mathlib. The implementation copies `mkInst` and `processDefDeriving` from `Lean.Elab.Deriving.Basic` (Lean 4.29.0-rc6) and adds the normalization step. This is intentionally a temporary copy: once we settle on the right behavior, it will be upstreamed into Lean 4. - [ ] depends on: #35950 🤖 Prepared with Claude Code	large-import LLM-generated	353/3	Mathlib/Init.lean,Mathlib/Tactic/DerivingInferInstanceAs.lean,Mathlib/Tactic/InferInstanceAsPercent.lean,MathlibTest/DerivingInferInstanceAs.lean	4	2	['github-actions', 'mathlib-dependent-issues']	nobody	4-51316 4 days ago	24-58422 24 days ago	0-218 3 minutes
37449	dagurtomas author:dagurtomas	feat(Condensed): the free light condensed module on `ℕ∪∞` is internally projective	From [LeanCondensed](https://github.com/dagurtomas/LeanCondensed) Co-authored by: @jonasvanderschaaf --- - [ ] depends on: #37451 - [ ] depends on: #37452 - [ ] depends on: #37453 - [ ] depends on: #37454 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR merge-conflict	414/0	Mathlib.lean,Mathlib/CategoryTheory/EffectiveEpi/Preserves.lean,Mathlib/Condensed/Light/Epi.lean,Mathlib/Condensed/Light/Module.lean,Mathlib/Condensed/Light/Sequence.lean,Mathlib/Topology/Category/LightProfinite/Limits.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean	7	11	['dagurtomas', 'github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts', 'mathlib-splicebot']	nobody	3-74345 3 days ago	6-9523 6 days ago	0-503 8 minutes
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		189/0	Mathlib.lean,Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/MeasureTheory/Measure/ResolventTransform.lean	3	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	3-9324 3 days ago	3-9368 3 days ago	3-77283 3 days
36376	jessealama author:jessealama	feat(SimpleGraph): bridge from Perm.IsCycle to IsHamiltonian	This PR provides `IsHamiltonian.ofPerm`, 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/Combinatorics/SimpleGraph/Walks/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`: - `Perm.toList_eq_range_map_pow`: expresses `toList` as a range map over powers `Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean`: - `edge_ne_of_isCycleOn`: edge distinctness for cycle-on permutations - `IsHamiltonian.ofPerm`: the main theorem - [ ] depends on: #36307	large-import	264/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Hamiltonian.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Iterate.lean,Mathlib/Combinatorics/SimpleGraph/Walk/Operations.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	7	36	['SnirBroshi', 'github-actions', 'jessealama', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	2-84213 2 days ago	2-84215 2 days ago	14-40067 14 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	148/0	Mathlib.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Fib/Lame.lean,docs/1000.yaml	5	20	['github-actions', 'kennethgoodman', 'vihdzp']	nobody	2-13335 2 days ago	2-64048 2 days ago	2-69872 2 days
34773	semaraugusto author:semaraugusto	feat(InformationTheory): add Shannon entropy for probability mass functions	Add Shannon entropy for probability mass functions This PR defines the Shannon entropy of a probability mass function as an ℝ-valued infinite sum using `Real.negMulLog`, and proves basic properties and standard computations. Main results include: * entropy is nonnegative; * entropy vanishes iff the PMF is deterministic (`PMF.pure`); * entropy is strictly positive for non-pure PMFs; * entropy of a Bernoulli PMF coincides with `Real.binEntropy`; * entropy of uniform distributions is `log` of the cardinality, both for `PMF.uniformOfFintype` and `PMF.uniformOfFinset`. Several small helper lemmas isolate technical arguments about supports, coercions from `ℝ≥0∞`, and bounds on infinite sums, in order to keep the main proofs readable. See the [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/generic.20shannon.20entropy.20formalization.20mathlib4/with/570643335). --- I used ChatGPT for some proof structuring and refactoring suggestions, but all proofs were manually checked and adapted. I verified the arguments and adjusted naming and structure to follow mathlib conventions. The proof of shannonEntropy_eq_log_card_sub_toReal_klDiv_uniformOfFintype and some of its helper lemmas were initially generated using Codex. I manually reviewed the generated proof, checked each step, and refactored the code and naming to follow mathlib conventions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor LLM-generated	417/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/NegMulLog.lean,Mathlib/InformationTheory/Entropy.lean	3	14	['adomasbaliuka', 'dupuisf', 'github-actions', 'mathlib-merge-conflicts', 'mattrobball', 'semaraugusto', 'wwylele']	dupuisf and sgouezel assignee:sgouezel assignee:dupuisf	1-75424 1 day ago	1-75424 1 day ago	11-7118 11 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/)		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	4	['erdOne', 'github-actions', 'joelriou']	nobody	1-18821 1 day ago	1-35357 1 day ago	1-36457 1 day
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	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	1-15453 1 day ago	7-19099 7 days ago	0-832 13 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	95/49	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/Monotone.lean	4	3	['github-actions', 'mathlib-dependent-issues']	nobody	0-66701 18 hours ago	0-66702 18 hours ago	0-1299 21 minutes
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	86/49	Mathlib/Order/OrdContinuous.lean,Mathlib/Order/SemiconjSup.lean,Mathlib/Topology/Order/Basic.lean	3	3	['github-actions', 'mathlib-dependent-issues']	nobody	0-66700 18 hours ago	0-66701 18 hours ago	0-1447 24 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/)		159/0	Mathlib/CategoryTheory/Abelian/Injective/Dimension.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean	2	3	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-52301 14 hours ago	0-52324 14 hours ago	7-1355 7 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 say 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. It can also be used to simplify the proof of [MeasureTheory.hausdorffMeasure_pi_real](https://leanprover-community.github.io/mathlib4_docs/Mathlib/MeasureTheory/Measure/Hausdorff.html#MeasureTheory.hausdorffMeasure_pi_real). These will be done in another PR. --- - [ ] depends on: #37311 - [ ] depends on: #37312 - [x] depends on: #37313 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	280/6	Mathlib.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/MeasureTheory/Measure/UniformlyDistributed.lean,Mathlib/Order/Filter/ENNReal.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/MetricSpace/Bounded.lean	6	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-43766 12 hours ago	9-30812 9 days ago	0-524 8 minutes
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	4833/42	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Baer.lean,Mathlib/Algebra/Category/ModuleCat/Ext/BaseChange.lean,Mathlib/Algebra/Category/ModuleCat/Ext/Ulift.lean,Mathlib/Algebra/Category/ModuleCat/InjectiveDimension.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Bijection.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomologicalComplexAbelian.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/Gorenstein/CohenMacaulay.lean,Mathlib/RingTheory/Gorenstein/Defs.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/InjectiveDimension.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/Regular/ProjectiveDimension.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeRightExact.lean	24	4	['github-actions', 'mathlib-dependent-issues', 'mathlib-merge-conflicts']	nobody	0-22723 6 hours ago	25-27522 25 days ago	0-2167 36 minutes
37698	Qulinecier author:Qulinecier	feat: add TendstoInDistribution.continuousOn_comp_prodMk_of_tendstoInMeasure_const	This PR adds `TendstoInDistribution.continuousOn_comp_prodMk_of_tendstoInMeasure_const`, a generalization of the existing `TendstoInDistribution.continuous_comp_prodMk_of_tendstoInMeasure_const` (Slutsky's theorem) to functions that are only continuous on a closed subset `s` of the domain, rather than everywhere. This is useful when `g` is only well-behaved on a proper closed subset, such as division (away from zero) or logarithm (on the positive reals), where the previous version requiring global continuity was not applicable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	108/6	Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean	2	2	['github-actions']	nobody	0-20465 5 hours ago	0-20528 5 hours ago	0-20518 5 hours
37688	grunweg author:grunweg	feat: try using grind as gcongr discharger	Let's see what benchmarks say! --- - [ ] depends on: #37591 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR awaiting-CI	266/291	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2020Q2.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Expand.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/BoxIntegral/DivergenceTheorem.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/ParametricIntegral.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/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/Body.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Analysis/Convex/MetricSpace.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace/Basic.lean,Mathlib/Analysis/Distribution/Support.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/HahnBanach.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Polynomial/MahlerMeasure.lean,Mathlib/Analysis/Real/Pi/Bounds.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Order.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Chebyshev/Extremal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Analysis/SumIntegralComparisons.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Real/Basic.lean,Mathlib/GroupTheory/Archimedean.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Covering/DensityTheorem.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/L2Space.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Monotonicity.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/FinMeasAdditive.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/Decomposition/RadonNikodym.lean,Mathlib/MeasureTheory/Measure/Hausdorff.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean	122	10	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-radar', 'mathlib-dependent-issues']	nobody	0-10672 2 hours ago	0-44102 12 hours ago	0-7 7 seconds
37705	Wolfman56 author:Wolfman56	feat: log inequalities, chi-squared MGF, and Johnson-Lindenstrauss lemma	## Summary Three new formalizations implementing the Dasgupta–Gupta (2003) elementary Gaussian proof of the Johnson–Lindenstrauss (JL) lemma, arranged as a dependency chain: --- ### 1. `Mathlib.Analysis.SpecialFunctions.Log.Inequalities` Sharp upper bounds on the natural logarithm needed for JL Chernoff bounds: - `Real.log_one_add_le` : `Real.log (1 + ε) ≤ ε − ε² / 4` for `ε ∈ [0, 1]` - `Real.log_one_sub_le` : `Real.log (1 − ε) ≤ −ε − ε² / 4` for `ε ∈ [0, 1)` Proved via `MonotoneOn`/`AntitoneOn` from `HasDerivAt` and the mean value theorem. These complement the existing lower bound `Real.le_log_one_add_of_nonneg`. --- ### 2. `Mathlib.Probability.Moments.ChiSquared` - `mgf_sq_gaussianReal` : `mgf (fun ω => X ω ^ 2) ℙ t = (1 - 2 * t) ^ (-(1/2) : ℝ)` for `X ~ N(0,1)`, `t < 1/2` Uses `integral_gaussianReal_eq_integral_smul`, completing the square, and `integral_gaussian`. This is the χ²(1) MGF identity. Mathlib has `ProbabilityTheory.mgf_gaussianReal` (MGF of X) but not of X². --- ### 3. `Mathlib.Probability.Concentration.JohnsonLindenstrauss` Full formalization of the JL lemma (Dasgupta–Gupta 2003): for any finite n-point set S ⊆ ℝᵈ, a random Gaussian projection into ℝᵐ with m ≥ 4 ε⁻² log n is an ε-isometry with positive probability. Key declarations: `gaussianMatrixMeasure`, `jl_chisq_complement_bound`, `jl_concentration_single_pair`, `jl_union_bound`, `johnson_lindenstrauss`. --- ## Prior Art Check (Loogle, 2026-04-06) All seven public declarations confirmed absent from Mathlib master. Nearest existing results noted in the per-file module headers. --- ## Use of AI This PR was developed with significant assistance from AI tools — specifically GitHub Copilot (Claude Sonnet) acting as a coding agent, and Google Gemini used for independent review. The AI was used to: - Write the initial Lean proof code for all three files - Iterate on proof tactics when goals did not close - Check naming conventions against Mathlib style (Gemini flagged that the log lemmas should live in `namespace Real`, which was corrected before submission) - Verify that the union bound proof used `measure_biUnion_finset_le` and `Finset.sum_const` correctly The author has reviewed all code, understands the mathematical content and proof structure, and can vouch for the correctness of the arguments. The proofs follow the standard Dasgupta–Gupta (2003) route and use only established Mathlib APIs. Reviewers should be aware that AI-generated Lean code can have subtle issues with generality and Mathlib integration that are not immediately apparent from a clean build result. --- ## Reference S. Dasgupta and A. Gupta, An elementary proof of a theorem of Johnson and Lindenstrauss, Random Structures and Algorithms 22(1):60–65, 2003.	new-contributor LLM-generated	1032/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/Inequalities.lean,Mathlib/Probability/Concentration/JohnsonLindenstrauss.lean,Mathlib/Probability/Moments/ChiSquared.lean	4	2	['github-actions']	nobody	0-3920 1 hour ago	0-7818 2 hours ago	0-130 2 minutes

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