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: November 14, 2025 at 07:02 UTC

Overall statistics

Found 2097 open PRs overall. Among these PRs

413 (19.7%) are awaiting review (these ones), among these 51 (12.3%) by new contributors (these ones)
370 (17.6%) are blocked on another PR
197 (9.4%) are awaiting the PR author's action
256 (12.2%) have a merge conflict: among these, 119 (46.5%) would be ready for review otherwise: these
36 (1.7%) are labelled help-wanted or please-adopt (roughly these)
801 (38.2%) are marked as draft or work in progress
15 (0.7%) are awaiting the outcome of a zulip discussion (these ones)
0 (0.0%) have contradictory labels (these ones)
9 (0.4%) are delegated (stale ones are here)
0 (0.0%) have been sent to bors (stale ones are here)

Approved, not yet landed PRs

At the moment,

0 PRs are ready to merge — among these no stale ones, congratulations!
24 PRs are waiting on maintainer approval (these), of which 16 have not been updated in a day (these)

24 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
23213	mattrobball author:mattrobball	chore(RingTheory.Derivation): add a `LinearMapClass` instance	Often we want `simp` to call `map_zero` or `map_add` for a `Derivation`. To find the `ZeroHomClass` or `AddHomClass` instance necessary it starts to climb up the type class hierarchy including looking for a `LinearMapClass` instance which didn't exist. Consequently, sythesis would look in a lot of crazy places trying to summon ring structures on the module or on derivations itself. Here we add the missing `LinearMapClass` instance so that `simp` is more efficient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	189-31531 6 months ago	189-31531 6 months ago	47-39026 47 days
23214	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	189-31297 6 months ago	189-31297 6 months ago	47-32152 47 days
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	161-65320 5 months ago	161-66210 5 months ago	0-11212 3 hours
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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	153-23757 5 months ago	153-59295 5 months 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 t-meta delegated awaiting-author	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	18	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'plp127']	alexjbest assignee:alexjbest	77-49872 2 months ago	77-50754 2 months ago	83-71907 83 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated awaiting-author label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	9	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	31-80453 1 month ago	31-80453 1 month ago	6-29891 6 days
29855	eric-wieser author:eric-wieser	chore(Data/Finset/Sort): lemmas about `0 : Fin _` and `Fin.last _`	We already had these for `⟨0, ⋯⟩` and `⟨k - 1, ⋯⟩`. Moves: - `Finset.orderEmbOfFin_zero` -> `Finset.orderEmbOfFin_mk_zero` - `Finset.orderEmbOfFin_last` -> `Finset.orderEmbOfFin_mk_last` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order easy delegated	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	28-41424 28 days ago	49-73514 1 month ago	3-79002 3 days
25737	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_δ`s	We prove that admissible lists indeed provide a normal form for morphisms of satisfying `P_δ`. To this end, we introduce `standardδ`, a construction that takes a list and turn it into a composition of `δ i`s in `SimplexCategoryGenRel`. We then prove that, thanks to the first simplicial identity, composition on the left corresponds to simplicial insertion in the list. This gives existence of a normal form for every morphism satisfying `P_δ`. For unicity, we introduce an auxiliary function `simplicialEvalδ : (List ℕ) → ℕ → ℕ` and show that for admissible lists, it lifts to `ℕ` the `orderHom` attached to `toSimplexCategory.map standardδ`, and that we can recover elements of the list only by looking at values of this function. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [x] depends on: #25736 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21746. Original PR: https://github.com/leanprover-community/mathlib4/pull/21746	t-algebraic-topology t-category-theory delegated	182/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	23-61094 23 days ago	24-52810 24 days ago	0-22513 6 hours
30914	eric-wieser author:eric-wieser	feat(Data/Set/NAry): lemmas for `diff`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order delegated	10/0	Mathlib/Data/Set/NAry.lean	1	2	['github-actions', 'grunweg', 'mathlib-bors']	nobody	18-51182 18 days ago	18-51182 18 days ago	0-56942 15 hours
26544	vihdzp author:vihdzp	feat(SetTheory/ZFC/Ordinal): Lean ordinals to ZFC ordinals	We define `Ordinal.toZFSet` and prove that its outputs are precisely the ZFC ordinals. Moved from #19985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-set-theory delegated	166/5	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean	4	26	['alreadydone', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	10-2034 10 days ago	10-2034 10 days ago	84-52000 84 days
31444	harahu author:harahu	doc(Probability/Martingale/BorelCantelli): polish docstrings	Fix some typos and inconsistencies in `BorelCantelli`. The issues were found and fixed using Codex. The most substantive change is going from $$f_n := \sum_{k < n} \mathbf{1}_{s_{n + 1}} - \mathbb{P}[s_{n + 1} \mid \mathcal{F}_n]$$ to $$f_n := \sum_{k < n} \big(\mathbf{1}_{s_{k + 1}} - \mathbb{P}[s_{k + 1} \mid \mathcal{F}_k]\big).$$ As far as I can tell, this is more faithful to the contents of the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability delegated	5/5	Mathlib/Probability/Martingale/BorelCantelli.lean	1	3	['github-actions', 'grunweg', 'mathlib-bors']	nobody	3-60452 3 days ago	3-60452 3 days ago	0-71658 19 hours
30950	jessealama author:jessealama	feat: add AffineEquiv.ofLinearEquiv	Adds a constructor for building affine equivalences from linear equivalences and base points. --- Extracted from #30854. cc @Vierkantor @YaelDillies	t-algebra delegated label:t-algebra$	42/0	Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean	1	25	['YaelDillies', 'github-actions', 'j-loreaux', 'jessealama', 'jsm28', 'mathlib-bors']	nobody	1-82312 1 day ago	2-34594 2 days ago	2-37505 2 days
31403	JovanGerb author:JovanGerb	feat(push_neg): tag `not_frequently` and `not_eventually`	This PR add support for `not_frequently` and `not_eventually` in the `push_neg` tactic, and it refactors some proofs using this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated	46/63	Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Markov.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Order/Filter/Ultrafilter/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Semicontinuous.lean	19	15	['ADedecker', 'JovanGerb', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1-53885 1 day ago	2-46018 2 days ago	2-64700 2 days
14712	FR-vdash-bot author:FR-vdash-bot	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict delegated 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	24	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	403-73327 1 year ago	406-10403 1 year ago	20-15089 20 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 delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	223-59671 7 months ago	223-59671 7 months ago	0-214 3 minutes
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	181-53693 5 months ago	181-53695 5 months ago	82-54712 82 days
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/)	t-meta merge-conflict delegated awaiting-author	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	16	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	156-20582 5 months ago	156-20583 5 months ago	34-82472 34 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/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	132-11181 4 months ago	132-11181 4 months ago	91-73632 91 days
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 - `mul_left_monotone` and `mul_right_monotone` are exactly the wrong way around - `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/)	merge-conflict delegated	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/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/PSeries.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/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Real/Pi/Bounds.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/Padics/Hensel.lean,Mathlib/Order/Concept.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/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean,Mathlib/Topology/MetricSpace/Holder.lean	59	8	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors']	bryangingechen assignee:bryangingechen	125-18896 4 months ago	125-47920 4 months ago	2-60107 2 days
27872	JovanGerb author:JovanGerb	chore(gcongr): clean up imports	This PR removes redundant `gcongr` imports. And when we do import `gcongr`, we now also import the core `@[gcongr]` tags, and also `grw`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict delegated	7/23	Archive/Imo/Imo2019Q4.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/MvPolynomial/SchwartzZippel.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	21	11	['JovanGerb', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	85-6917 2 months ago	85-6917 2 months ago	4-34325 4 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 merge-conflict delegated	118/3	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	18	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	21-81171 21 days ago	21-81172 21 days ago	15-14325 15 days
23600	mattrobball author:mattrobball	perf(Quiver.Basic): make `IsThin` a `class`	It seems problematic that `Quiver.IsThin` is an `abbrev` for (essentially) `Subsingleton`. We turn it in a one-field class. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	27/21	Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Groupoid/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Limits/SmallComplete.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Quiver/Basic.lean	11	17	['b-mehta', 'github-actions', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	17-50768 17 days ago	17-50769 17 days ago	0-5717 1 hour
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/)	t-algebra merge-conflict 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	13-63013 13 days ago	13-63014 13 days ago	28-12053 28 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 merge-conflict delegated label:t-algebra$	33/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	8	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	3-67664 3 days ago	3-67665 3 days ago	56-85445 56 days

Review status

There are currently 416 PRs awaiting review. Among these,

0 are labelled easy (these ones),
1 are addressing technical debt (namely these), and
176 appeared on the review queue within the last two weeks.

On the other hand, 39 PRs are unassigned and have not seen a status change in a week, and 132 PRs are assigned, without recent review activity.

Stale 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
30355	kckennylau author:kckennylau	feat(Logic): graded functions	This PR defines a class of graded functions, called `GradedFunLike`. It is intended to be used in #30312 to characterise a class of graded ring homomorphisms, where it is invoked as `[GradedFunLike F 𝒜 ℬ] [RingHomClass F A B]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	41/0	Mathlib.lean,Mathlib/Data/FunLike/Graded.lean	2	1	['github-actions']	nobody	none	35-67449 1 month ago	36-21520 1 month ago	36-21554 36 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`. Additionally, I need `equivSigmaToSet` (in `Data/Setoid/Basic`) to prove things about `SimpleGraph.ConnectedComponent`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	179/0	Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Setoid/Basic.lean	4	2	['eric-wieser', 'github-actions']	nobody	none	22-76643 22 days ago	23-66136 23 days ago	23-66175 23 days
30821	chriseth author:chriseth	fix(Computability/Tape): introduce write-simplification theorem that uses `ListBlank.mk`	Add a simplification theorem which is a version of `Tape.write_mk'` that solves a simplification dead-end: If we have an expression of the form `(Tape.mk' L (ListBlank.cons a (ListBlank.mk R))).write b`, the theorem `Tape.write_mk'` would be applicable, but lean instead uses `ListBlank.cons_mk`, which turns it into `(Tape.mk' L (ListBlank.mk (a :: R))).write b` and makes `Tape.write_mk` no longer applicable because it requires `ListBlank.cons a R`, reaching a dead-end. This PR adds an equivalent theorem whose LHS allows `ListBlank.mk (a :: R)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	7/0	Mathlib/Computability/Tape.lean	1	1	['github-actions']	nobody	none	21-58469 21 days ago	21-58478 21 days ago	21-58517 21 days
30882	themathqueen author:themathqueen	feat(Data/Nat/Fib): the Cassini and Catalan identities	The [Cassini and Catalan identities](https://en.wikipedia.org/wiki/Cassini_and_Catalan_identities) are identities for the Fibonacci numbers. * Cassini's identity: `fib (n + 1) * fib (n - 1) - fib n ^ 2 = (-1) ^ n` for nonzero `n`. * Catalan's identity: `fib (x + a) ^ 2 - fib (x + 2 * a) * fib x = fib a ^ 2 * (-1) ^ x` for nonzero `x` and `a`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	93/0	Mathlib.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Nat/Fib/Lemmas.lean	3	13	['github-actions', 'themathqueen', 'vihdzp']	nobody	none	19-27879 19 days ago	19-31284 19 days ago	19-32004 19 days
30936	themathqueen author:themathqueen	feat(Data/Int): define `Int.fib`, the Fibonacci numbers on the integers	We define `Int.fib`, the integer version of `Nat.fib`, which satisfies `Int.fib 0 = 0`, `Int.fib 1 = 1`, and `Int.fib (n + 2) = Int.fib n + Int.fib (n + 1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	172/0	Mathlib.lean,Mathlib/Data/Int/Fib.lean	2	11	['Ruben-VandeVelde', 'github-actions', 'themathqueen', 'vihdzp']	nobody	none	13-74792 13 days ago	17-56421 17 days ago	18-52083 18 days
31119	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph/Walk): a vertex of a walk is in its tail starting from the second vertex onwards	Add helper theorems for https://github.com/leanprover-community/mathlib4/pull/29309 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	10/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	3	['SnirBroshi', 'github-actions']	nobody	none	13-3196 13 days ago	13-76266 13 days ago	13-76970 13 days
31120	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): toSubgraph and Subgraph.map preserve connectivity	Add helper theorems for https://github.com/leanprover-community/mathlib4/pull/29309 --- - [ ] depends on : #31118 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	42/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	nobody	none	12-72814 12 days ago	13-1467 13 days ago	13-74746 13 days
31107	rudynicolop author:rudynicolop	feat(Data/Multiset): add Multiset filter and bind lemmas	Add basic lemmas equating `Multiset` `filter`, `filterMap`, `join`, and `bind` operations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	67/2	Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean	2	7	['Ruben-VandeVelde', 'github-actions', 'rudynicolop']	nobody	1	10-20409 10 days ago	14-31106 14 days ago	14-31142 14 days
30391	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	This PR continues the work from #24395. Original PR: https://github.com/leanprover-community/mathlib4/pull/24395	t-data new-contributor	154/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	7	['BoltonBailey', 'github-actions', 'rudynicolop']	nobody	none	10-19897 10 days ago	35-28278 1 month ago	35-28312 35 days
31103	YaelDillies author:YaelDillies	feat: removing leaves from a connected graph keeps it connected	... using properties of 2-connected components. From the ProofBench workshop --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	78/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Data/List/Nodup.lean	2	6	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	none	9-53306 9 days ago	9-78826 9 days ago	14-23809 14 days
30639	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Connected): `IsBridge` is antitone	--- - [x] depends on: #30602 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	1	5	['SnirBroshi', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	9-51730 9 days ago	9-51925 9 days ago	9-62471 9 days
31243	FlAmmmmING author:FlAmmmmING	feat(Mathlib/Combinatorics/SimpleGraph/Planar.lean): Define the planar graph in mathlib	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean	2	5	['SnirBroshi', 'github-actions']	nobody	none	9-37486 9 days ago	10-12675 10 days ago	10-12710 10 days
30214	SnirBroshi author:SnirBroshi	feat(Data/List/Basic): add `Fin` variants of `*mem_iff_getElem`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	8/0	Mathlib/Data/List/Basic.lean	1	5	['SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	none	8-37887 8 days ago	8-37906 8 days ago	40-27052 40 days
31038	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA acceptsFrom definitions and lemmas	This PR defines `NFA.acceptsFrom`, similar to [`DFA.acceptsFrom`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Computability/DFA.html#DFA.acceptsFrom), and provides helper lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	108/6	Mathlib/Computability/NFA.lean	1	23	['eric-wieser', 'github-actions', 'rudynicolop']	nobody	none	8-24379 8 days ago	16-23892 16 days ago	16-23939 16 days
31287	YaelDillies author:YaelDillies	refactor(SetTheory/ZFC): deduplicate coercion to sets	Currently, we have both `ZFSet.toSet` and `SetLike.coe` to turn a `ZFSet` into a `Set ZFSet`. This is bad for simp normal form. This PR removes the first spelling in favor of the second one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	111/104	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/Ordinal.lean	3	16	['YaelDillies', 'eric-wieser', 'github-actions', 'staroperator']	nobody	1	7-40484 7 days ago	8-58012 8 days ago	8-58049 8 days
30940	jessealama author:jessealama	feat(Data/Set/Image): add Option.range lemmas for elim function	This PR adds two new lemmas about `Option.elim` and `range`: - `Option.range_elim`: characterizes the range of a function defined via `Option.elim` - `Option.image_elim_range_some_eq_range`: the image of `range some` under `Option.elim b f` equals `range f` ## Context These lemmas are part of a larger PR (#30854) that touched multiple areas of Mathlib. Following reviewer suggestions, the PR has been split into smaller, focused contributions. This PR contains only the changes to `Mathlib/Data/Set/Image.lean`. ## Potential Reviewers Based on recent contributions to `Mathlib/Data/Set/Image.lean`: - @euprunin - @plp127	t-data	12/0	Mathlib/Data/Set/Image.lean	1	5	['github-actions', 'jessealama', 'plp127']	nobody	1	6-65544 6 days ago	18-42053 18 days ago	18-42091 18 days
31201	euprunin author:euprunin	chore(RingTheory): golf `isPrimary_decomposition_pairwise_ne_radical` using `grind`	--- Show trace profiling of `isPrimary_decomposition_pairwise_ne_radical`: 89 ms before, 156 ms after ### Trace profiling of `isPrimary_decomposition_pairwise_ne_radical` before PR 31201 ```diff diff --git a/Mathlib/RingTheory/Lasker.lean b/Mathlib/RingTheory/Lasker.lean index 8f522d48f8..21bf4d68b6 100644 --- a/Mathlib/RingTheory/Lasker.lean +++ b/Mathlib/RingTheory/Lasker.lean @@ -57,6 +57,7 @@ lemma decomposition_erase_inf [DecidableEq (Ideal R)] {I : Ideal R} open scoped Function -- required for scoped `on` notation +set_option trace.profiler true in lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ ``` ``` ℹ [1261/1261] Built Mathlib.RingTheory.Lasker (1.3s) info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.013044] theorem isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.definition.header] [0.010071] Ideal.isPrimary_decomposition_pairwise_ne_radical info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.016459] lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.async] [0.091697] elaborating proof of Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.definition.value] [0.089099] Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.step] [0.086924] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.086918] classical [… 154 lines omitted …] Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK [Elab.step] [0.020717] rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK [Elab.step] [0.010102] · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.010064] simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.010060] simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.015365] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.015273] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.015268] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.027960] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.027947] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.027944] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014324] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014317] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014310] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] Build completed successfully (1261 jobs). ``` ### Trace profiling of `isPrimary_decomposition_pairwise_ne_radical` after PR 31201 ```diff diff --git a/Mathlib/RingTheory/Lasker.lean b/Mathlib/RingTheory/Lasker.lean index 8f522d48f8..6f1c39f8a7 100644 --- a/Mathlib/RingTheory/Lasker.lean +++ b/Mathlib/RingTheory/Lasker.lean @@ -57,6 +57,7 @@ lemma decomposition_erase_inf [DecidableEq (Ideal R)] {I : Ideal R} open scoped Function -- required for scoped `on` notation +set_option trace.profiler true in lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ @@ -64,16 +65,8 @@ lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ - · rw [← hs] - refine le_antisymm ?_ ?_ <;> intro x hx - · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, - Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ - intro J hJ - exact hx J hJ J hJ rfl - · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, - Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ - intro J _ K hK _ - exact hx K hK + · ext + grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ ``` ``` ℹ [1261/1261] Built Mathlib.RingTheory.Lasker (1.2s) info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.011121] theorem isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.012898] lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.async] [0.157957] elaborating proof of Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.definition.value] [0.156050] Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.step] [0.154194] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.154189] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.154184] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, [… 59 lines omitted …] ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ [Elab.step] [0.017062] expected type: ∃ t, t.inf id = I ∧ (∀ ⦃J : Ideal R⦄, J ∈ t → J.IsPrimary) ∧ (↑t).Pairwise ((fun x1 x2 ↦ x1 ≠ x2) on radical), term ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ [Elab.step] [0.017043] expected type: ∃ t, t.inf id = I ∧ (∀ ⦃J : Ideal R⦄, J ∈ t → J.IsPrimary) ∧ (↑t).Pairwise ((fun x1 x2 ↦ x1 ≠ x2) on radical), term Exists.intro✝ ((s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id) ⟨?_, ?_, ?_⟩ [Elab.step] [0.016253] expected type: Finset (Ideal R), term (s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id [Elab.step] [0.013756] expected type: , term (s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})) [Elab.step] [0.013751] expected type: , term s.image (fun J ↦ {I ∈ s \| I.radical = J.radical}) [Elab.step] [0.011627] expected type: ?m.44 → Finset (Ideal R), term (fun J ↦ {I ∈ s \| I.radical = J.radical}) [Elab.step] [0.011622] expected type: ?m.44 → Finset (Ideal R), term fun J ↦ {I ∈ s \| I.radical = J.radical} [Elab.step] [0.011555] expected type: Finset (Ideal R), term {I ∈ s \| I.radical = J.radical} [Elab.step] [0.090158] · ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.090093] ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.090089] ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.089120] grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.014619] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.014610] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.014605] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.026753] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.026740] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.026737] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013805] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013799] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013796] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] Build completed successfully (1261 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	2/10	Mathlib/RingTheory/Lasker.lean	1	2	['erdOne', 'github-actions']	nobody	none	5-67928 5 days ago	5-67928 5 days ago	11-40100 11 days
30559	SnirBroshi author:SnirBroshi	feat(Data/Sym/Sym2): add `Sym2.diagSet`	feat(Data/Sym/Sym2): add `Sym2.diagSet`, the set of elements on the diagonal --- This should help state theorems in simple graphs more easily (e.g. see `SimpleGraph.edgeSet_fromEdgeSet`, `SimpleGraph.edgeSet_eq_iff`, `SimpleGraph.edgeSet_sdiff_sdiff_isDiag`, `SimpleGraph.edgeSet_subset_setOf_not_isDiag`) and more importantly work with such statements. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	42/5	Mathlib/Data/Sym/Sym2.lean	1	1	['github-actions']	nobody	none	5-19011 5 days ago	30-36560 30 days ago	30-36596 30 days
31416	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): lemmas about the first and last darts/edges	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	43/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	nobody	none	4-83225 4 days ago	4-83227 4 days ago	4-83260 4 days
31418	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): impl `Iso.degree_eq` and `Iso.minDegree_eq` and `Iso.maxDegree_eq`	Move `Iso.card_edgeFinset_eq` further down in Finite.lean and implement: - `Iso.degree_eq` - `Iso.minDegree_eq` - `Iso.maxDegree_eq` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	51/12	Mathlib/Combinatorics/SimpleGraph/Finite.lean	1	1	['github-actions']	nobody	none	4-73201 4 days ago	4-73475 4 days ago	4-73499 4 days
31423	harahu author:harahu	doc(Combinatorics): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `Combinatorics` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually should be. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. I have used my own judgement to decide whether to demote the extra H1 headers to H2 or H3. I've also tried to ensure that any intended header hierarchy is maintained, by further demoting existing H2 comments to H3 where applicable. I ask reviewers to verify that my choices makes sense to them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	20/22	Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Stirling.lean,Mathlib/Combinatorics/Matroid/Circuit.lean,Mathlib/Combinatorics/Matroid/Minor/Contract.lean,Mathlib/Combinatorics/Matroid/Minor/Delete.lean,Mathlib/Combinatorics/Matroid/Minor/Order.lean,Mathlib/Combinatorics/Matroid/Rank/Cardinal.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Combinatorics/Matroid/Rank/Finite.lean	9	1	['github-actions']	nobody	none	4-70961 4 days ago	4-70977 4 days ago	4-71009 4 days
26710	metakunt author:metakunt	feat (Data/Nat/Digits/Lemmas): Add digits_getD	Adds digits_getD, an explicit computation of the i-th digits of n in base b representation.	t-data new-contributor	15/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	19	['github-actions', 'metakunt', 'pechersky', 'plp127']	nobody	none	4-64461 4 days ago	6-2161 6 days ago	62-82654 62 days
30618	wwylele author:wwylele	feat(Combinatorics): Glaisher's theorem	This proves Glaisher's theorem, one of the 1000+ theorems. It is also a generalization of [Euler's partition theorem](https://github.com/leanprover-community/mathlib4/blob/master/Archive/Wiedijk100Theorems/Partition.lean), which can be rewritten as a collorary of this (will be in a different PR) --- - [ ] depends on: #30599 - [ ] depends on #30567 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	533/15	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Enumerative/Partition.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Order.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,docs/1000.yaml	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	4-59312 4 days ago	4-59315 4 days ago	4-61792 4 days
31431	harahu author:harahu	doc(Data): misc. improvements	This PR fixes a batch of typos in the `Data` subdirectory. Found and fixed with help from Codex. As part of this work, we also demote some headers that shouldn't have been H1. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	12/20	Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean	3	6	['github-actions', 'grunweg', 'harahu', 'metakunt']	nobody	1	4-46777 4 days ago	4-64737 4 days ago	4-64774 4 days
31467	maix00 author:maix00	feat(Combinatorics/SimpleGraph): add simp lemma `getVert_map` for `Walk.map`	feat(Combinatorics/SimpleGraph) add simp lemma `getVert_map` to `Walk.map`; set longFile simple fact but can only be proved by reverting the start point of the walk due to the inductive definition --- - in concept similar to `List.getElem_map` - deserve a simp lemma (useful when pushing walks between Subgraphs) lemma getVert_map (i : ℕ) : (p.map f).getVert i = f (p.getVert i) := by revert u; induction i with \| zero => simp \| succ => intro _ p; cases p <;> simp [*] can not just use simp to prove this fact	new-contributor t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	nobody	none	3-64187 3 days ago	3-64199 3 days ago	3-64236 3 days
31308	alreadydone author:alreadydone	feat(RingTheory): `Module.Invertible.tmul_comm`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	59/2	Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/PicardGroup.lean	3	5	['alreadydone', 'github-actions', 'themathqueen']	nobody	none	3-61595 3 days ago	8-30464 8 days ago	8-30499 8 days
31473	YaelDillies author:YaelDillies	feat(RingTheory): compute `counitAlgHom`/`comulAlgHom` on specific bialgebras	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	15/0	Mathlib/RingTheory/Bialgebra/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean	3	1	['github-actions']	nobody	none	3-51384 3 days ago	3-51449 3 days ago	3-51424 3 days
31362	BeibeiX0 author:BeibeiX0	feat(partitions): generalized pentagonal numbers.	feat(partitions): generalized pentagonal numbers and error term eₙ Introduce infrastructure around Euler’s pentagonal number theorem: * Define parity counters for strict partitions: - `p_even_distinct n` - `p_odd_distinct n` - `strict_partitions_parity_diff n := (p_even_distinct n : ℤ) - (p_odd_distinct n : ℤ)` * Generalized pentagonal numbers: - `generalizedPentagonalZ : ℤ → ℤ` with basic API (`gpn_nonneg`, `gpn_coe`) - `generalizedPentagonalNum : ℤ → ℕ` - parity lemma `even_neg_j_add_three_j_sq` and `even_neg_j_add_three_j_sq'` - search window equivalence `exists_j_iff_exists_j_in_range` - `Decidable (∃ j : ℤ, n = generalizedPentagonalZ j)` via a bounded range * Euler error term: - `error_term_e n : ℤ` (≔ `(-1)^{\|j\|}` if `n = generalizedPentagonalZ j` for some `j`, and `0` otherwise) * Finite product cut-off of the generating function: - `E n : PowerSeries ℤ := ∏_{k=1}^{n+1} (1 - X^k)` - lemma `coeff_E_eq_coeff_cutoff` Implementation notes: * Keep the integer-valued version `generalizedPentagonalZ` for arithmetic lemmas and signs; obtain the natural-number version via `Int.toNat`. * The bounded search lemma gives a small window `j ∈ [-(n+1), n+1]` for decidability. Motivation: * This is groundwork for proofs of Euler’s pentagonal number theorem and parity identities relating strict partitions to the error term. References: * https://en.wikipedia.org/wiki/Pentagonal_number_theorem	new-contributor t-combinatorics	256/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/PentagonalNumbers.lean	2	5	['BeibeiX0', 'github-actions', 'wwylele']	nobody	none	3-31514 3 days ago	6-56669 6 days ago	6-56703 6 days
31494	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/SecondInter): `eq_or_eq_secondInter_of_mem_affineSpan_pair_iff_mem`	Add a variant of `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` in a form that's more convenient when the line is given in terms of two points, rather than a point and a vector. ```lean /-- A point on a line through a point on a sphere and a second point equals that point or `secondInter`. -/ lemma Sphere.eq_or_eq_secondInter_of_mem_affineSpan_pair_iff_mem {s : Sphere P} {p q : P} (hp : p ∈ s) {p' : P} (hp' : p' ∈ line[ℝ, p, q]) : p' = p ∨ p' = s.secondInter p (q -ᵥ p) ↔ p' ∈ s := by ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	11/0	Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean	1	1	['github-actions']	nobody	none	3-17207 3 days ago	3-17273 3 days ago	3-17248 3 days
31240	AntoineChambert-Loir author:AntoineChambert-Loir	feat: base change properties, direct sums, bases, modules of linear maps	Establish various `IsBaseChange` properties: * direct sums commute with base change * when the source module is finite free, modules of linear maps commute with base change (on the right, on both sides, and for endomorphisms). * a base change of a free module is free, with compatible bases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	399/6	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	6	3	['AntoineChambert-Loir', 'github-actions']	nobody	none	3-16268 3 days ago	3-16268 3 days ago	10-26996 10 days
31498	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/Independent): add affine independence permutation lemmas for three points	--- Add three helper theorems for convenient reasoning with affine independence: - `AffineIndependent.comm_left` - `AffineIndependent.comm_right` - `AffineIndependent.reverse_of_three`	t-algebra label:t-algebra$	25/0	Mathlib/LinearAlgebra/AffineSpace/Independent.lean	1	1	['github-actions']	nobody	none	3-6025 3 days ago	3-6046 3 days ago	3-6081 3 days
31499	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/FiniteDimensional): add lemma preserving affine independence under collinear point replacement	--- Add `affineIndependent_of_affineIndependent_collinear_ne`	t-algebra label:t-algebra$	15/0	Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean	1	1	['github-actions']	nobody	none	3-5685 3 days ago	3-5692 3 days ago	3-5733 3 days
31496	Scarlett-le author:Scarlett-le	feat(Geometry/Euclidean/Sphere/Power): power equals squared tangent length and characterization of tangency	Adds two lemmas in `Geometry.Euclidean.Sphere.Power`: * `power_eq_dist_sq_of_IsTangentAt` — the power of a point equals the square of its tangent length. * `IsTangentAt_of_dist_sq_eq_power` — characterization of tangency via the power of a point.	large-import new-contributor t-euclidean-geometry	18/0	Mathlib/Geometry/Euclidean/Sphere/Power.lean	1	2	['github-actions', 'jsm28']	nobody	none	2-65463 2 days ago	3-11877 3 days ago	3-11919 3 days
31414	SnirBroshi author:SnirBroshi	feat(Data/Nat/Bitwise): formula for the xor of {0,...,n}	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	40/2	Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bitwise.lean	2	3	['SnirBroshi', 'github-actions', 'plp127']	nobody	none	2-56296 2 days ago	4-45676 4 days ago	4-83537 4 days
30706	astrainfinita author:astrainfinita	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This PR builds upon #8370 and avoids `Algebra ℚ` typeclass assumptions wherever possible. Many `[NormedAlgebra ℚ 𝔸]` can be generalized to `[NontriviallyNormedField 𝕂] [CharZero 𝕂] [ContinuousSMul ℚ 𝕂] [NormedAlgebra 𝕂 𝔸]`, which basically means allowing `ℚ` to use other equivalent norms, and may not be the case of concern. It might be possible to use some Prop-valued typeclasses to avoid the diamond problem potentially caused by `[NormedAlgebra ℚ 𝔸]`. This makes it unnecessary to manually obtain `[NormedAlgebra ℚ 𝔸]` when we have `[NormedAlgebra ℝ 𝔸]` or `[NormedAlgebra ℂ 𝔸]`. Co-authored-by: Eric Wieser --- - [ ] depends on: #28475 There are still some documentation comments that need to be updated. Zulip: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	477/444	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/Normed/Algebra/DualNumber.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/RCLike.lean,Mathlib/Combinatorics/Derangements/Exponential.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Probability/Distributions/Poisson.lean	22	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	none	1-21699 1 day ago	15-18263 15 days ago	0-996 16 minutes
31217	YaelDillies author:YaelDillies	feat: turn a closed walk into a cycle	From the ProofBench workshop Closes #23637, which does the same thing under a stronger hypothesis on the starting closed walk. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	50/18	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean	4	8	['MrQubo', 'SnirBroshi', 'YaelDillies', 'github-actions']	nobody	none	0-58201 16 hours ago	10-69132 10 days ago	10-69309 10 days
31247	rudynicolop author:rudynicolop	feat(Computability/DFA): add DFA complement, union, and intersection	Add theorems for DFA complement, union, and intersection closure, and prove that regular languages are closed under complement, union, and intersection. Note there's a [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553522644) regarding PRs for regular languages (also tracked in #24205). Admittedly, this is yet another PR, and this may prove obsolete if other PRs are merged first. In particular, this PR competes with #20238 and #15651. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	124/5	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	34	['ctchou', 'github-actions', 'rudynicolop', 'staroperator']	nobody	1	0-26231 7 hours ago	9-80181 9 days ago	9-80215 9 days
31363	euprunin author:euprunin	chore(LinearAlgebra/AffineSpace): golf entire `attach_affineCombination_of_injective` using `simp`	--- Show trace profiling of `attach_affineCombination_of_injective`: 39 ms before, 83 ms after ### Trace profiling of `attach_affineCombination_of_injective` before PR 31363 ```diff diff --git a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean index dbcbffbf97..80a6e546e8 100644 --- a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean +++ b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean @@ -399,6 +399,7 @@ theorem affineCombination_vsub (w₁ w₂ : ι → k) (p : ι → P) : s.affineCombination k p w₁ -ᵥ s.affineCombination k p w₂ = s.weightedVSub p (w₁ - w₂) := by rw [← AffineMap.linearMap_vsub, affineCombination_linear, vsub_eq_sub] +set_option trace.profiler true in theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by ``` ``` ℹ [1120/1120] Built Mathlib.LinearAlgebra.AffineSpace.Combination (2.4s) info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.command] [0.011952] theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.async] [0.041027] elaborating proof of Finset.attach_affineCombination_of_injective [Elab.definition.value] [0.039381] Finset.attach_affineCombination_of_injective [Elab.step] [0.038759] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy [Elab.step] [0.038753] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy [Elab.step] [0.014701] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] Build completed successfully (1120 jobs). ``` ### Trace profiling of `attach_affineCombination_of_injective` after PR 31363 ```diff diff --git a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean index dbcbffbf97..f7919e28b5 100644 --- a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean +++ b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean @@ -399,20 +399,11 @@ theorem affineCombination_vsub (w₁ w₂ : ι → k) (p : ι → P) : s.affineCombination k p w₁ -ᵥ s.affineCombination k p w₂ = s.weightedVSub p (w₁ - w₂) := by rw [← AffineMap.linearMap_vsub, affineCombination_linear, vsub_eq_sub] +set_option trace.profiler true in theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by - simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, - Function.comp_apply, AffineMap.coe_mk] - let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) - let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) - change univ.sum g₁ = (image f univ).sum g₂ - have hgf : g₁ = g₂ ∘ f := by - ext - simp [g₁, g₂] - rw [hgf, sum_image] - · simp only [g₂,Function.comp_apply] - · exact fun _ _ _ _ hxy => hf hxy + simp [affineCombination, hf] theorem attach_affineCombination_coe (s : Finset P) (w : P → k) : s.attach.affineCombination k ((↑) : s → P) (w ∘ (↑)) = s.affineCombination k id w := by ``` ``` ℹ [1120/1120] Built Mathlib.LinearAlgebra.AffineSpace.Combination (2.4s) info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.command] [0.012162] theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by simp [affineCombination, hf] info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.async] [0.084734] elaborating proof of Finset.attach_affineCombination_of_injective [Elab.definition.value] [0.083451] Finset.attach_affineCombination_of_injective [Elab.step] [0.082443] simp [affineCombination, hf] [Elab.step] [0.082438] simp [affineCombination, hf] [Elab.step] [0.082430] simp [affineCombination, hf] [Meta.Tactic.simp.discharge] [0.030281] univ_eq_empty discharge ❌️ IsEmpty ↥s [Meta.synthInstance] [0.028689] ❌️ Nonempty ↥s Build completed successfully (1120 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	1/11	Mathlib/LinearAlgebra/AffineSpace/Combination.lean	1	4	['euprunin', 'github-actions', 'grunweg']	nobody	none	0-21699 6 hours ago	6-35166 6 days ago	6-51525 6 days
31453	kim-em author:kim-em	feat: locally contractible spaces		t-topology	196/0	Mathlib.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Homotopy/LocallyContractible.lean,docs/references.bib	4	1	['github-actions']	nobody	none	0-21696 6 hours ago	4-19606 4 days ago	4-21563 4 days

Stale 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
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.	new-contributor t-measure-probability	13/0	Mathlib/MeasureTheory/PiSystem.lean	1	13	['EtienneC30', 'KiringYJ', 'github-actions', 'ocfnash']	RemyDegenne assignee:RemyDegenne	none	98-21700 3 months ago	105-57749 3 months ago	132-45580 132 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/)	t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	25	['PierreQuinton', 'YaelDillies', 'github-actions', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	1	97-71877 3 months ago	109-55174 3 months ago	109-55196 109 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	t-topology	509/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	8	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	urkud assignee:urkud	none	94-21717 3 months ago	157-9027 5 months ago	172-40949 172 days
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/)	t-ring-theory	455/13	Mathlib/RingTheory/Valuation/Basic.lean,MathlibTest/Simproc/ValEquiv.lean	2	34	['b-mehta', 'eric-wieser', 'github-actions', 'kckennylau', 'pechersky', 'plp127']	erdOne assignee:erdOne	none	87-21707 2 months ago	97-43399 3 months ago	98-17892 98 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.	new-contributor t-combinatorics	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	1	['github-actions']	awainverse assignee:awainverse	none	86-21715 2 months ago	97-40184 3 months ago	97-40217 97 days
28186	Sebi-Kumar author:Sebi-Kumar	feat(Topology/Homotopy/Path): Add IsEquiv instance for Path.Homotopic	Add `instance : IsEquiv (Path x₀ x₁) Homotopic` to the library. Allow use of lemmas like `of_eq` when proving two paths are homotopic. --- To provide additional context, I am relatively new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at the University of Western Ontario and supervised by Chris Kapulkin and Daniel Carranza. My goal is to prove that the `n`-sphere is simply connected for `n > 1`. Also, I am not super familiar with `IsEquiv` and when it should/shouldn't be used. I just wanted to use a lemma like `Path.Homotopic.of_eq` at one point while working on my code, and thought this was the best way to add such a result to the library. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	5/0	Mathlib/Topology/Homotopy/Path.lean	1	4	['Sebi-Kumar', 'github-actions', 'kckennylau']	PatrickMassot assignee:PatrickMassot	none	86-21712 2 months ago	95-53042 3 months ago	95-53078 95 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/)	large-import t-order t-topology	160/2	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	3	1	['github-actions']	PatrickMassot assignee:PatrickMassot	none	81-21689 2 months ago	93-3905 3 months ago	93-6603 93 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/)	t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	19	['alexkeizer', 'eric-wieser', 'github-actions', 'quangvdao']	eric-wieser assignee:eric-wieser	1	78-55072 2 months ago	128-22779 4 months ago	128-22811 128 days
23238	YaelDillies author:YaelDillies	feat: extended floor and ceil	My motivation for this is to prove `ENat.toENNReal (⨆ i, f i) = ⨆ i, ENat.toENNReal (f i)` and `ENat.toENNReal (⨅ i, f i) = ⨅ i, ENat.toENNReal (f i)`. Kalle Kytölä independently needs this for his formalisation of statistical physics. From MiscYD --- - [x] depends on: #24781 - [x] depends on: #24782 See #15269 for a past attempt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	235/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean	2	25	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kkytola', 'mathlib4-dependent-issues-bot', 'urkud']	alreadydone assignee:alreadydone	none	78-49348 2 months ago	186-46713 6 months ago	234-12518 234 days
26240	grunweg author:grunweg	perf(CommandLinterLinter): use Substring more	Probably, these changes make little difference, but let's find out. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC	14/15	Mathlib/Tactic/Linter/CommandStart.lean	1	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	joneugster assignee:joneugster	none	76-79496 2 months ago	146-30659 4 months ago	146-35258 146 days
25920	BoltonBailey author:BoltonBailey	feat(Data/Finsupp/Basic): `Finsupp.optionElim'`	Similar to how Finsupp.cons constructs a map Fin (n + 1) →₀ M from a map Fin n →₀ M, we define Finsupp.optionElim' to construct a map Option α →₀ M from a map α →₀ M, given an additional value for none. We base this on the new optionEquiv definition. As a function, it behaves as Option.elim', hence the name. We prove a variety of API lemmas, based on those for Finsupp.cons, to bring the definitions more in line with the contents of Data/Finsupp/Fin. We also refactor to a new file to help avoid a too-long file and make this more analogous to Finsupp.cons Original PR: https://github.com/leanprover-community/mathlib4/pull/13861 - [x] depends on: #26309	migrated-from-branch t-data	114/23	Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Option.lean	2	15	['BoltonBailey', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	none	74-1339 2 months ago	74-6385 2 months ago	138-63260 138 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/)	new-contributor t-combinatorics	375/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	52	['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	none	69-74165 2 months ago	69-74165 2 months ago	75-60343 75 days
28511	YaelDillies author:YaelDillies	feat(Finsupp): `congr!`-compatible version of `prod_congr`	`congr!` doesn't like the `g1 x (f x)` appearing in the hypothesis of `Finsupp.prod_congr`: `f x` isn't a free variable. Note: A few proofs broke due to `simp` using `congr` lemmas internally. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	17/11	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean	5	12	['JovanGerb', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	kmill assignee:kmill	none	67-72799 2 months ago	89-79254 2 months ago	89-79283 89 days
24184	YaelDillies author:YaelDillies	feat: `[G : H]` notation for the index of `H : Subgroup G`	This is a cute notation which I wrote for FLT. Not sure whether we want it in mathlib nor how to include `relindex` in the picture. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC label:t-algebra$	5/0	Mathlib/GroupTheory/Index.lean	1	8	['YaelDillies', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	none	61-43011 2 months ago	61-43036 2 months ago	209-30746 209 days
22043	YaelDillies author:YaelDillies	chore: shortcut instance for `Neg ℤˣ`	This lets us avoid importing `Ring` in downstream files (most of the effect is to come). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	20/47	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Ring/Int/Units.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/Int/AbsoluteValue.lean,Mathlib/Data/Int/Associated.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/NumberTheory/NumberField/Basic.lean,MathlibTest/Zify.lean	12	17	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors']	eric-wieser assignee:eric-wieser	none	59-80506 1 month ago	183-63543 5 months ago	268-36562 268 days
26110	YaelDillies author:YaelDillies	feat: sharp monoids	Define sharp monoids, which are the monoids whose only unit is `1`. This concept is useful in log geometry and in particular shows up in the theory of affine monoids. This concept already existed in the guise of `Subsingleton Mˣ`, but giving it a name makes it easier to refer to and uncovers some missing instances. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	51/30	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Data/List/Prime.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/RingTheory/Valuation/Integers.lean	18	7	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'vihdzp']	adomani assignee:adomani	none	59-54644 1 month ago	63-49075 2 months ago	147-49112 147 days
29530	ShreckYe author:ShreckYe	feat(Dynamics/PeriodicPts): some theorems for `Pi.map` in `Dynamics/PeriodicPts` analogous to those for `Prod.map`	Split from #29204. Some namespace prefixes are added in `GroupTheory/OrderOfElement.lean` to distinguish the extra imports introduced. - [ ] depends on: #29528	large-import	77/8	Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	dupuisf assignee:dupuisf	none	56-21701 1 month ago	63-47534 2 months ago	63-48182 63 days
29400	ShreckYe author:ShreckYe	feat(`Algebra/BigOperators`): products of the results of insertion and removal on tuples and lists, and some needed lemmas		large-import	102/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/Vector/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean	6	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	none	55-33545 1 month ago	67-69497 2 months ago	67-69536 67 days
29235	yoh-tanimoto author:yoh-tanimoto	feat(Topology/Algebra/Module/ClosedSubmodule): add `mapEquiv`, a variation of `ClosedSubmodule.map` for CLE	add `ClosedSubmodule.mapEquiv` for continuous linear equivalence. In this case, a closed submodule is mapped to a closed submodule, so the definitions are easier and behave nicely with `closure` and `⊔`. motivation: needed to define standard subspaces in a Hilbert space (scalar multiplication by `Complex.I`) #29251 https://ems.press/content/serial-article-files/48171 - [x] depends on: #29230 for `Lattice` `CompleteLattice`	t-topology	69/1	Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	fpvandoorn assignee:fpvandoorn	none	54-31447 1 month ago	62-51261 2 months ago	62-53543 62 days
29688	tb65536 author:tb65536	feat(FieldTheory/IsGaloisGroup): prove the Galois correspondence for `IsGaloisGroup`	This PR reproves the Galois correspondence for `IsGaloisGroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	89/0	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	1	['github-actions']	joneugster assignee:joneugster	none	52-21707 1 month ago	59-36423 1 month ago	59-36396 59 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 label:t-algebra$	180/2	Mathlib/LinearAlgebra/LinearPMap.lean	1	2	['github-actions', 'mcdoll']	kim-em assignee:kim-em	none	51-35475 1 month ago	59-46426 1 month ago	59-46399 59 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/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	1	50-51362 1 month ago	81-41599 2 months ago	81-41628 81 days
29596	alreadydone author:alreadydone	chore(Algebra): extract `Submonoid.IsLocalizationMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	282/119	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Localization/Defs.lean	7	3	['github-actions', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	none	50-21705 1 month ago	57-61662 1 month ago	61-74579 61 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	large-import t-topology	174/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	4	['github-actions', 'joelriou', 'scholzhannah']	ADedecker assignee:ADedecker	none	43-78341 1 month ago	44-64063 1 month ago	143-44469 143 days
26287	mbkybky author:mbkybky	feat(Data/ENat/Lattice): coercion to `WithBot ℕ∞` commutes with `biSup`	The coercion from `ℕ∞` to `WithBot ℕ∞` commutes with `biSup` and `biInf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	24/0	Mathlib/Data/ENat/Lattice.lean	1	5	['github-actions', 'kckennylau', 'mbkybky']	ericrbg assignee:ericrbg	none	43-58434 1 month ago	43-58434 1 month ago	123-59653 123 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/)	new-contributor t-dynamics	401/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean	2	13	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	none	42-75618 1 month ago	80-8061 2 months ago	86-63924 86 days
29734	bwangpj author:bwangpj	feat(Probability/Kernel): \phi-irreducibility of kernels	Define powers of kernels, the Chapman-Kolmogorov equations, as well as \phi-irreducibility of kernels, following Robert-Casella, "Monte Carlo Statistical Methods", Definition 6.13. Co-authored-by: Matteo Cipollina @or4nge19 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	160/8	Mathlib.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/CompMap.lean,Mathlib/Probability/Kernel/Irreducible.lean,docs/references.bib	5	6	['RemyDegenne', 'bwangpj', 'github-actions']	RemyDegenne assignee:RemyDegenne	none	41-67645 1 month ago	51-56803 1 month ago	58-9437 58 days
29376	vlad902 author:vlad902	feat(SimpleGraph): helper lemmas for `Walk.IsSubwalk`		t-combinatorics	29/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	awainverse assignee:awainverse	none	40-77890 1 month ago	68-85807 2 months ago	68-85837 68 days
25814	vlad902 author:vlad902	feat(SimpleGraph): weaker condition for paths in acyclic graphs	`IsAcyclic.isPath_iff_chain'` defines a weaker condition for proving that a walk is a path, in particular it shows that rather than proving that all vertices in the support of a walk are distinct, one must only show that consecutive edges are distinct (e.g. every other vertex must be distinct.) This leads to a simple corollary that trails are also paths in acyclic graphs. I had a need for this when formalizing Cayley graphs, since this condition maps cleanly onto words in free groups being reduced. --- This PR continues the work from #25630. Original PR: https://github.com/leanprover-community/mathlib4/pull/25630	t-combinatorics	38/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean	2	2	['github-actions', 'vlad902']	kmill assignee:kmill	none	40-76886 1 month ago	154-60299 5 months ago	154-60269 154 days
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	t-data	30/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	2	['github-actions', 'mans0954']	alreadydone assignee:alreadydone	none	39-48457 1 month ago	101-75089 3 months ago	142-84490 142 days
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-topology t-number-theory label:t-algebra$	73/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	9	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	alreadydone assignee:alreadydone	none	39-39310 1 month ago	78-42053 2 months ago	128-27055 128 days
26985	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define implicitFunOfProdDomain	This PR continues the work from #16743. Original PR: https://github.com/leanprover-community/mathlib4/pull/16743 --- - [x] depends on: #28352 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	107/4	Mathlib/Analysis/Calculus/Implicit.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	none	38-21713 1 month ago	45-82201 1 month ago	45-83775 45 days
29361	FlAmmmmING author:FlAmmmmING	feat: Catalan generating function as a formal power series	We introduce the Catalan generating function as a formal power series over `ℕ`. ## Main Definitions * `PowerSeries.catalanSeries`: The Catalan generating function as a power series. ## Main Results * `PowerSeries.sum_coeff_X_catalanSeries`: When `n` is a natural number, each term in the sum `coeff i X * catalan (n - i)` is 0 except for `i = 1`. * `PowerSeries.coeff_X_mul_catalanSeries`: The coefficient of `X * catalanSeries` at `X^n` is `catalan (n - 1)` when `n > 0`. * `PowerSeries.catalanSeries_one_add_X_mul_self_sq`: The Catalan generating function satisfies the equation `catalanSeries = 1 + X * catalanSeries ^ 2`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	71/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	kbuzzard assignee:kbuzzard	none	36-84710 1 month ago	69-80785 2 months ago	69-80811 69 days
30107	grunweg author:grunweg	chore: track occurrences of 'nonrec' as technical debt	Matches leanprover-community/leanprover-community.github.io#689: only merge when that is deemed a good idea. -------- TODO: make the count more robust, for instance count all occurrences of "^nonrec " plus those of "^[private\|protected] nonrec ". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI	1/0	scripts/technical-debt-metrics.sh	1	1	['github-actions']	robertylewis assignee:robertylewis	none	36-21704 1 month ago	43-80992 1 month ago	43-80967 43 days
30116	FormulaRabbit81 author:FormulaRabbit81	feat(Measure): proof that a relatively compact set of measures is tight	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability	196/2	Mathlib/MeasureTheory/Measure/Tight.lean	1	1	['github-actions']	kex-y assignee:kex-y	none	36-21704 1 month ago	43-31960 1 month ago	43-31990 43 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/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	none	35-21711 1 month ago	57-70711 1 month ago	57-70752 57 days
29347	themathqueen author:themathqueen	refactor(Algebra/Star/StarAlgHom): let `StarAlgEquiv` extend `StarRingEquiv` instead of `RingEquiv`	Instead of having `StarAlgEquiv` extend `RingEquiv` and have properties `map_star'` and `map_smul'`, it now extends `StarRingEquiv` with only `map_smul'`. --- Will add more API in the next PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/36	Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean	2	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'themathqueen']	dupuisf and kbuzzard assignee:dupuisf assignee:kbuzzard	none	35-14792 1 month ago	68-34628 2 months ago	70-57578 70 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/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	awainverse assignee:awainverse	none	34-21721 1 month ago	50-51644 1 month ago	50-51679 50 days
27254	yuanyi-350 author:yuanyi-350	2025 imo problem3	- [x] depends on: #28788 - [x] depends on: #28790 - [x] depends on: #28829 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	231/0	Archive.lean,Archive/Imo/Imo2025Q3.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean	3	28	['github-actions', 'jsm28', 'kbuzzard', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen', 'wwylele', 'yuanyi-350']	jsm28 assignee:jsm28	none	30-79261 30 days ago	72-23803 2 months ago	105-85062 105 days
26961	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add API	Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	57/5	Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	13	['Ruben-VandeVelde', 'github-actions', 'mariainesdff', 'mattrobball']	mattrobball assignee:mattrobball	none	30-75923 30 days ago	56-70583 1 month ago	104-4199 104 days
30233	Komyyy author:Komyyy	refactor(Topology/Sequences): generalize seq-compactness lemmas to metrizable space	* [`IsSeqCompact.isCompact`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#IsSeqCompact.isCompact) * [`UniformSpace.isCompact_iff_isSeqCompact`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#UniformSpace.isCompact_iff_isSeqCompact) * [`UniformSpace.compactSpace_iff_seqCompactSpace`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#UniformSpace.compactSpace_iff_seqCompactSpace) These are lemmas on uniform spaces which has countable uniformity, so can be generalized to pseudo-metrizable space. From [CLT](https://github.com/RemyDegenne/CLT) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	20/7	Mathlib/Topology/Sequences.lean,docs/overview.yaml,docs/undergrad.yaml	3	1	['github-actions']	grunweg assignee:grunweg	none	29-21700 29 days ago	36-76154 1 month ago	36-76626 36 days
30003	vlad902 author:vlad902	feat(Order): helper lemmas for `IsChain`/`IsAntichain`	These were useful in formalizing Dilworth's theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	23/2	Mathlib/Order/Antichain.lean,Mathlib/Order/Preorder/Chain.lean	2	23	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vlad902']	YaelDillies assignee:YaelDillies	none	28-34973 28 days ago	30-46401 30 days ago	48-13387 48 days
28604	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes (minimally invasive version)	Add the missing `NonAssocComm(Semi)ring` classes and add some missing instances between existing classes. Contrary to #28532, the approach here doesn't add any new `extends`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	59/17	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean	3	21	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	none	27-54965 27 days ago	43-25907 1 month ago	43-84920 43 days
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		159/104	Mathlib/Data/Fin/Tuple/Basic.lean	1	7	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	1	27-52112 27 days ago	45-48953 1 month ago	47-18454 47 days
28141	YaelDillies author:YaelDillies	chore: deprecate `BialgHom.coe_toLinearMap`	`BialgHom.toLinearMap` is a fake projection. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	5/11	Mathlib/RingTheory/Bialgebra/Hom.lean	1	8	['YaelDillies', 'eric-wieser', 'github-actions']	alreadydone assignee:alreadydone	none	27-32796 27 days ago	27-32796 27 days ago	96-85207 96 days
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/)		208/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/Resultant/Quadratic.lean	2	3	['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot']	JovanGerb assignee:JovanGerb	none	26-69844 26 days ago	36-41385 1 month ago	36-45264 36 days
22771	alreadydone author:alreadydone	feat(Homotopy/Lifting): monodromy of covering maps and lifting criterion	Define the monodromy of a covering map: given a path in the base space, lifting it through the covering map induces a bijection between the fibers at the two endpoints of the path. Definition 2.1 in https://ncatlab.org/nlab/show/monodromy. --- - [ ] depends on: #28234 - [x] depends on: #22649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	193/146	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean	9	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	none	26-37765 26 days ago	82-70426 2 months ago	144-35711 144 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/)	t-algebraic-geometry	66/0	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean	1	1	['github-actions']	alexjbest assignee:alexjbest	none	26-21669 26 days ago	33-80614 1 month ago	33-80644 33 days
29706	kim-em author:kim-em	feat: add piCongrSigmaFiber and piCongrFiberwise equivalences	## Summary Add two new equivalence functions for working with fibers and sigma types: - `Equiv.piCongrSigmaFiber`: transforms between functions on sigma fibers and regular pi types - `Equiv.piCongrFiberwise`: lifts fiber-wise equivalences to product equivalences These functions are from the FLT (Fermat's Last Theorem) project and are useful for manipulating dependent function types indexed by fibers of a function. ## Details The new definitions allow for elegant transformations between: 1. Functions defined on sigma types representing fibers of a function 2. Regular dependent functions These are particularly useful in algebraic contexts where one needs to work with products indexed by fibers. ## Context This PR was prepared by Claude (Claude Code) based on the following prompt: > "Please read FLT/Mathlib/Logic/Equiv/Basic.lean, and also the corresponding file in the Mathlib repository. Please prepare a PR to Mathlib containing this content, putting it at an appropriate point in the corresponding Mathlib file. Make sure the PR is label FLT, and write in the PR comment an explanation that the PR was prepared by Claude, including quoting the prompting." The content is sourced from `/Users/kim/projects/lean/FLT/FLT/Mathlib/Logic/Equiv/Basic.lean` in the FLT project repository. 🤖 Generated with [Claude Code](https://claude.ai/code)	FLT t-logic	39/0	Mathlib/Logic/Equiv/Basic.lean	1	5	['Ruben-VandeVelde', 'github-actions', 'kim-em']	fpvandoorn assignee:fpvandoorn	none	25-26463 25 days ago	58-63442 1 month ago	58-79645 58 days
29969	smmercuri author:smmercuri	refactor: use isometry extensions for completions at infinite places of number fields	The API for `InfinitePlace.Completion` currently makes use of abstract results defined on absolute values, which all depend on the hypothesis of the form `∀ x, ‖f x‖ = v x`. This is equivalent to `f` being an isometry, and so many of these results can be bypassed and deprecated by using `Isometry.completion_extension` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		73/48	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/Topology/MetricSpace/Completion.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	none	24-83875 24 days ago	24-84137 24 days ago	48-20598 48 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	pechersky assignee:pechersky	2	24-21700 24 days ago	50-43156 1 month ago	68-39349 68 days
30344	Deep0Thinking author:Deep0Thinking	feat(MeasureTheory/Integral): add versions of `exists_eq_interval_average` and first mean value theorem for integrals	Add the First mean value theorem for (unordered) interval integrals on ℝ. - `exists_eq_const_mul_interval_integral_of_continuous_on_of_ae_nonneg` - `exists_eq_const_mul_interval_integral_of_continuous_on_of_nonneg` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	290/41	Mathlib.lean,Mathlib/MeasureTheory/Integral/IntervalAverage.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean	3	9	['Deep0Thinking', 'github-actions', 'plp127']	RemyDegenne assignee:RemyDegenne	none	24-17641 24 days ago	36-39066 1 month ago	36-39095 36 days
27307	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	This PR continues the work from #22279. Original PR: https://github.com/leanprover-community/mathlib4/pull/22279	t-ring-theory	391/0	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.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	9	9	['chrisflav', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	mattrobball assignee:mattrobball	none	22-82973 22 days ago	101-48096 3 months ago	116-59407 116 days
30259	erdOne author:erdOne	feat(Valuation): uniformizer of discrete valuation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	31/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean	1	2	['github-actions', 'pechersky']	alreadydone assignee:alreadydone	none	22-21694 22 days ago	39-24398 1 month ago	39-24433 39 days
30336	kckennylau author:kckennylau	feat(RingTheory): some lemmas about the irrelevant ideal	This PR adds some lemmas about the irrelevant ideal of a graded ring, such as the fact that it is the iSup of each positively graded component. --- Split from #26061. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	49/5	Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean	1	1	['github-actions']	mattrobball assignee:mattrobball	none	22-21692 22 days ago	36-53993 1 month ago	36-54026 36 days
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	138/1	Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean	2	1	['github-actions']	PatrickMassot assignee:PatrickMassot	none	22-21687 22 days ago	29-61096 29 days ago	29-61133 29 days
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	29	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	1	21-75164 21 days ago	21-75164 21 days ago	140-77895 140 days
26129	LessnessRandomness author:LessnessRandomness	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles	This PR continues the work from #24206. Original PR: https://github.com/leanprover-community/mathlib4/pull/24206	new-contributor t-euclidean-geometry	202/15	Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean	8	85	['JovanGerb', 'LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'themathqueen']	jsm28 assignee:jsm28	none	21-64439 21 days ago	24-50688 24 days ago	145-33260 145 days
29422	jsm28 author:jsm28	fix(Data/Finset/Max): Use `DecidableEq` for `insert` lemmas	These `insert` in these lemma statements uses a `DecidableEq` instance derived from `LinearOrder`; make them syntactically more general by passing in a `DecidableEq` instance separately. (Some `insert` lemmas in this file already take `DecidableEq` hypotheses.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	8/8	Mathlib/Data/Finset/Max.lean	1	2	['eric-wieser', 'github-actions']	pechersky assignee:pechersky	none	21-21717 21 days ago	67-19662 2 months ago	67-19635 67 days
29437	SnirBroshi author:SnirBroshi	feat(Data/Seq): add Seq.subsequence and prove basic theorems about it	I added `Seq.subsequence` to compose a sequence with a monotone function, creating a subsequence. Aliased to `Seq.comp` since it's a composition. I also added `Nat.le_induction_step_iff` which is needed to prove a subsequence is a sequence. This proves the comment at the top of `Defs.lean` that says "if `f n = none`, then `f m = none` for all `m ≥ n`" while `IsSeq` only talks about `n+1`. For completion I added the same statement for `Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	104/0	Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Seq/Defs.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	pechersky assignee:pechersky	none	21-21717 21 days ago	57-68920 1 month ago	66-56405 66 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/)	t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	8	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'vihdzp', 'wwylele']	pechersky assignee:pechersky	none	20-21708 20 days ago	64-20114 2 months ago	64-20103 64 days
29982	hrmacbeth author:hrmacbeth	feat: new `isolate` tactic	This PR adds a new tactic, `isolate`, which "solves for x" in an equation or relation. For example: ```lean example (a b : ℝ) (f : ℝ → ℝ) : 5 * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / 5` ``` The `isolate` tactic may generate side goals, if these are necessary to justify the transformation. The tactic will attempt to justify such side goals using `positivity` (as in the above example), unification, or type class inference, but if unsuccessful will present them to the user. For example: ```lean example (a b c : ℝ) (f : ℝ → ℝ) : c * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / c` -- second (side) new goal: `⊢ 0 < c` ``` The `isolate` tactic is extensible. Coverage may be extended to new relations and new operations-to-be-undone by tagging appropriate lemmas with the new `@[isolate]` attribute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	863/3	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	24	['JovanGerb', 'PatrickMassot', 'github-actions', 'hrmacbeth', 'kim-em']	JovanGerb assignee:JovanGerb	none	20-5773 20 days ago	48-33858 1 month ago	48-33837 48 days
30436	wwylele author:wwylele	feat(Topology/InfiniteSum): tprod_one_{add/sub}_ordered	This extends the existing `Finset.prod_one_sub_ordered` to infinite sum/product, and also adds the more natural `add` version. Together with some previous PRs about infinite sum/prod and powerseries, this is part of my effort of upstreaming useful stuff from https://github.com/wwylele/PentagonalNumberTheorem. It starts getting into niche lemma, so suggestions such that not wanting this in mathlib, or it should be stated in a different form, are all welcomed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	44/0	Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean	2	1	['github-actions']	grunweg assignee:grunweg	none	19-21697 19 days ago	26-46746 26 days ago	33-66467 33 days
27946	plp127 author:plp127	refactor: have `MetrizableSpace` not depend on `MetricSpace`	Some theorems for uniform spaces with a countably generated uniformity do not mention their uniformity in any of the hypotheses or the conclusion (for example `UniformSpace.isCompact_iff_isSeqCompact`). This PR allows those theorems to be stated for (pseudo)metrizable spaces without importing the real numbers. - Use `TopologicalSpace.pseudoMetrizableSpaceUniformity` to endow a pseudometrizable space with a compatible uniformity, and use `TopologicalSpace.pseudoMetrizableSpaceUniformity_countably_generated` to show that this is countably generated. - `TopologicalSpace.pseudoMetrizableSpacePseudoMetric` and `TopologicalSpace.metrizableSpaceMetric` have been moved to `Mathlib/Topology/Metrizable/Uniformity.lean`. See also #2032 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	128/102	Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Topology/Compactness/PseudometrizableLindelof.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/ContinuousMap.lean,Mathlib/Topology/Metrizable/Real.lean,Mathlib/Topology/Metrizable/Uniformity.lean	7	15	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127', 'urkud', 'vihdzp']	urkud assignee:urkud	none	17-55593 17 days ago	32-54823 1 month ago	101-41842 101 days
30293	vlad902 author:vlad902	feat(SimpleGraph): there exists a maximal path/trail in a graph with finite edges	Inspired by [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Help.20me.20learn.20good.20style.3A.20IsTree/near/543395218) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	27/1	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	2	['github-actions', 'vlad902']	awainverse assignee:awainverse	none	17-21714 17 days ago	37-77288 1 month ago	37-77317 37 days
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra. --- - [x] depends on: #30806	new-contributor	223/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	7	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	TwoFX assignee:TwoFX	none	17-10624 17 days ago	17-13895 17 days ago	44-82270 44 days
29539	YaelDillies author:YaelDillies	feat: monoid algebras are invariant under base change	From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric large-import	112/6	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean	3	6	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	mattrobball assignee:mattrobball	none	16-84137 16 days ago	16-84159 16 days ago	63-35701 63 days
29186	winstonyin author:winstonyin	feat: IsIntegralCurve for solutions to ODEs	I define `IsIntegralCurve` etc. for solutions to ODEs on vector spaces. The translation and scaling lemmas are also included. This parallels `IsMIntegralCurve` etc. for manifolds. Moved from #26534. - [x] depends on: #26563 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis t-differential-geometry	298/100	Mathlib.lean,Mathlib/Analysis/ODE/Basic.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	grunweg and sgouezel assignee:grunweg assignee:sgouezel	none	16-82190 16 days ago	74-41552 2 months ago	74-41685 74 days
25856	MichaelStollBayreuth author:MichaelStollBayreuth	perf(Data.Real.Sqrt): make Real.sqrt irreducible	We try to see what happens if we make Real.sqrt irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). (Migrated manually from #24752) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	migrated-from-branch t-data	7/5	Mathlib/Data/Real/Sqrt.lean	1	6	['MichaelStollBayreuth', 'github-actions', 'j-loreaux', 'leanprover-bot']	ericrbg assignee:ericrbg	none	16-68924 16 days ago	74-40567 2 months ago	143-67153 143 days
25945	adomani author:adomani	feat: the empty line in commands linter	This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. This PR continues the work from #25236.	large-import t-linter	380/22	Mathlib.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/CommaMap.lean,Mathlib/CategoryTheory/Monoidal/Opposite/Mon_.lean,Mathlib/Data/UInt.lean,Mathlib/Init.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/HahnSeries/HahnEmbedding.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean	13	23	['adomani', 'bryangingechen', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	none	16-49952 16 days ago	16-77651 16 days ago	64-31589 64 days
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	22/0	Mathlib/Order/Defs/PartialOrder.lean	1	1	['github-actions']	Vierkantor assignee:Vierkantor	none	16-21691 16 days ago	28-31271 28 days ago	28-31312 28 days
30069	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `IsTree.dist_ne_of_adj` and necessary lemmas	This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	34/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	8	['github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	kmill assignee:kmill	none	15-81659 15 days ago	15-81659 15 days ago	44-46169 44 days
29946	smmercuri author:smmercuri	feat(InfinitePlace/Ramification): embeddings of unramified/ramified infinite places satisfy `IsUnmixed/IsMixed`	--- - [x] depends on: #29945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-number-theory	67/2	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri', 'xroblot']	alexjbest assignee:alexjbest	1	15-40952 15 days ago	15-41280 15 days ago	45-68071 45 days
30800	dagurtomas author:dagurtomas	feat(Condensed): cartesian monoidal functor LightProfinite -> LightCondSet	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	137/4	Mathlib.lean,Mathlib/Condensed/Light/Functors.lean,Mathlib/Topology/Category/CompHausLike/Cartesian.lean,Mathlib/Topology/Category/LightProfinite/Cartesian.lean	4	2	['dagurtomas', 'github-actions']	adamtopaz assignee:adamtopaz	none	15-21692 15 days ago	22-38981 22 days ago	22-39021 22 days
30131	fpvandoorn author:fpvandoorn	feat: alias_in attribute	* A small wrapper for adding an alias of a declaration in another namespace. * application time `.afterCompilation` is necessary for `#eval` to work correctly * Docstrings are copied, jump-to-definition works (no test in the test file, but tested locally) * To be used for CW-complexes, where lemmas are frequently duplicated between `RelCWComplex` and `CWComplex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) cc @scholzhannah	t-meta	93/0	Mathlib.lean,Mathlib/Util/AliasIn.lean,MathlibTest/Util/AliasIn.lean	3	13	['JovanGerb', 'fpvandoorn', 'github-actions']	JovanGerb assignee:JovanGerb	none	14-62157 14 days ago	42-51695 1 month ago	42-51670 42 days
26588	faenuccio author:faenuccio	feat(Algebra/GroupWithZero/WithZero): add the multiplicative embedding with zero from the range	We extend the embedding of the range of a `MonoidWithZeroHom` to the codomain by enriching it with the structure of an ordered, multiplicative embedding. In passing, we extend some results about the embedding of `WithZero` of the units of a group with zero, to the group itself. Co-authored by: María Inés de Frutos Fernández @mariainesdff --- - [x] depends on: #29594 - [x] depends on: #29644 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	114/2	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean	3	108	['YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	YaelDillies assignee:YaelDillies	none	13-40268 13 days ago	17-64128 17 days ago	51-1976 51 days
30525	515801431 author:515801431	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.	new-contributor t-combinatorics	109/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	2	['IvanRenison', 'github-actions']	awainverse assignee:awainverse	none	13-21691 13 days ago	31-15705 1 month ago	31-15739 31 days
30768	tb65536 author:tb65536	chore(GroupTheory/Subgroup/Centralizer): replace `centralizer (zpowers s)` with `centralizer {s}`	This PR fixes some lingering technical debt from two years ago: https://github.com/leanprover-community/mathlib3/pull/18965 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory t-algebra label:t-algebra$	32/34	Mathlib/Algebra/Group/Subgroup/ZPowers/Lemmas.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	1	['github-actions']	mattrobball assignee:mattrobball	none	13-21688 13 days ago	22-37296 22 days ago	22-37270 22 days
30855	Ruben-VandeVelde author:Ruben-VandeVelde	fix: deprecate IsTotal in favour of Std.Total	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC	208/111	Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Sigma/Lex.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Comparable.lean,Mathlib/Order/Compare.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/Directed.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	33	1	['github-actions']	alexjbest assignee:alexjbest	none	13-21684 13 days ago	20-58384 20 days ago	20-58358 20 days
30867	erdOne author:erdOne	feat(RingTheory/Etale): standard etale maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	315/1	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/Etale/StandardEtale.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	5	1	['github-actions']	mariainesdff assignee:mariainesdff	none	13-21682 13 days ago	20-28854 20 days ago	20-35299 20 days
30880	themathqueen author:themathqueen	feat(Analysis/InnerProductSpace): finite-dimensional inner product space with coalgebra implies an algebra structure	A finite-dimensional inner product space with a coalgebra structure also has an algebra structure by taking adjoints of the comultiplication map and counit map, i.e., `x * y = (adjoint comul) (x ⊗ₜ y)` and `algebraMap = adjoint counit`. TODO: There is also the opposite implication, i.e., a finite-dimensional inner product space with an algebra structure implies a coalgebra where `counit = adjoint Algebra.linearMap` and `comul = adjoint mul'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	123/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean	3	1	['github-actions']	urkud assignee:urkud	none	12-21695 12 days ago	19-65215 19 days ago	19-70790 19 days
30363	smmercuri author:smmercuri	feat: `PadicInt` is isomorphic to the integers of the uniform space completion `(Rat.padicValuation p).Completion`	- Uniform and ring isomorphisms between `𝒪[(Rat.padicValuation p).Completion]` and `ℤ_[p]` - A homeomorphism `e : X ≃ Y` gives a closed set `{ x : X \| p x ↔ q (e x) }` for clopen subsets given by `p` and `q` - Move `Padic.isUnit_den` to an earlier file to avoid having to import `Padics.RingHoms` unnecessarily --- - [x] depends on: #30361 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		86/21	Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Topology/Homeomorph/Defs.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	none	10-73862 10 days ago	35-51846 1 month ago	35-54377 35 days
30881	FlAmmmmING author:FlAmmmmING	feat(RingTheory/PowerSeries/Schroder.lean) : Define the generating function for large and small Schroder number	Define the generating function for large and small Schroder number. Main result : Prove some lemmas and the generating function of large Schroder. Todo : Prove the generating function of small Schroder. - depends on: #30609 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	350/1	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/RingTheory/PowerSeries/Schroder.lean	3	1	['github-actions']	dwrensha assignee:dwrensha	none	10-68346 10 days ago	19-69972 19 days ago	19-69958 19 days
30439	plp127 author:plp127	feat: `norm_num` extension for `IsSquare` on `Nat`, `Int`, `Rat`	Write a `norm_num` extension to evaluate `IsSquare` for `Nat`, `Int`, `Rat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	152/1	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/IsSquare.lean,MathlibTest/norm_num_ext.lean	4	10	['Rob23oba', 'dwrensha', 'github-actions', 'plp127', 'vasnesterov']	dwrensha assignee:dwrensha	none	10-37412 10 days ago	33-58027 1 month ago	33-58058 33 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 label:t-algebra$	182/0	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean	2	3	['github-actions', 'mans0954', 'urkud']	jcommelin assignee:jcommelin	none	9-58811 9 days ago	151-67162 4 months ago	151-67198 151 days
30246	dwrensha author:dwrensha	make Nat.digits use well-founded recursion once again	#25864 made `Nat.digits` structurally recursive, which has some benefits. In doing so, however, it added significant complexity. As brought up in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/structural.20recursion.20instead.20of.20well.20founded/near/543172385), on the balance that PR might not be considered an improvement. The present PR reverts that change (but keeps a code golf that was bundled with it). Note that recent improvements to core Lean mean that `simp` can handle the structurally recursive version without a problem: ```lean example : digits 10 123456789 = [9,8,7,6,5,4,3,2,1] := by simp [digits, digitsAux] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/45	Mathlib/Data/Nat/Digits/Defs.lean	1	8	['alreadydone', 'dwrensha', 'github-actions', 'j-loreaux', 'plp127']	TwoFX assignee:TwoFX	none	9-38543 9 days ago	39-50041 1 month ago	39-50070 39 days
30648	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): define the strict width of a subgroup	We define the periods of a subgroup of GL(2, R) to be the `x` such that `!![1, x; 0, 1]` is in the subgroup, and the strict width to be the unique positive generator of this subgroup (when it exists). This is a variant of a more familiar modular-forms concept, the width, which is the least positive `x` such that `± !![1, x; 0, 1]` is in the subgroup (note signs `±`). However, the strict width is the concept that's relevant for q-expansions. --- Carved off from the WIP PR #30089. - [x] depends on: #30461 - [x] depends on: #30471 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	182/2	Mathlib/NumberTheory/ModularForms/Cusps.lean	1	8	['CBirkbeck', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	alreadydone assignee:alreadydone	none	9-35217 9 days ago	16-30407 16 days ago	16-31304 16 days
30181	alreadydone author:alreadydone	feat(Data/Nat): reducible strong recursion	+ Redefine `Nat.strongRec'` to allow Lean kernel computation (reduction) with the strong Nat recursor. TODO: maybe merge this with Batteries' `Nat.strongRec`. + Redefine `Nat.xgcd` to use `Nat.strongRec'` to allow kernel reduction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	46/72	Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Init.lean	3	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	pechersky assignee:pechersky	none	9-21697 9 days ago	41-34702 1 month ago	41-40748 41 days
30477	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Bisector): oriented angle bisection and equal distance	Add a lemma ```lean lemma dist_orthogonalProjection_eq_iff_oangle_eq {p p' : P} {s₁ s₂ : AffineSubspace ℝ P} [s₁.direction.HasOrthogonalProjection] [s₂.direction.HasOrthogonalProjection] (hp' : p' ∈ s₁ ⊓ s₂) (hne : haveI : Nonempty s₁ := ⟨p', hp'.1⟩; haveI : Nonempty s₂ := ⟨p', hp'.2⟩; (orthogonalProjection s₁ p : P) ≠ orthogonalProjection s₂ p) (hp₁ : haveI : Nonempty s₁ := ⟨p', hp'.1⟩; orthogonalProjection s₁ p ≠ p') (hp₂ : haveI : Nonempty s₂ := ⟨p', hp'.2⟩; orthogonalProjection s₂ p ≠ p') : haveI : Nonempty s₁ := ⟨p', hp'.1⟩ haveI : Nonempty s₂ := ⟨p', hp'.2⟩ dist p (orthogonalProjection s₁ p) = dist p (orthogonalProjection s₂ p) ↔ ∡ (orthogonalProjection s₁ p : P) p' p = ∡ p p' (orthogonalProjection s₂ p) := ``` that is an oriented angle analogue of the existing `dist_orthogonalProjection_eq_iff_angle_eq`. Because the minimal nondegeneracy conditions required for the two directions of this lemma are different (whereas the unoriented version doesn't need any nondegeneracy conditions), those two directions are added as separate lemmas, each with minimal nondegeneracy conditions, from which the `iff` version is then deduced. --- - [ ] depends on: #30474 - [ ] depends on: #30476 - [ ] depends on: #30698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-euclidean-geometry	106/0	Mathlib/Geometry/Euclidean/Angle/Bisector.lean	1	3	['github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	JovanGerb assignee:JovanGerb	none	9-21695 9 days ago	17-1212 17 days ago	17-3535 17 days
30637	strihanje01 author:strihanje01	feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions	add Lindstrom's theorem and its strengthening for equal intersections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	210/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Lindstrom.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	none	9-21694 9 days ago	27-48962 27 days ago	27-49004 27 days
30733	harahu author:harahu	doc(Combinatorics): spell cliquefree as clique-free	This change was initially suggested to me by Codex, as part of #30621, but it made sense to do this as a free-standing PR, since this change requires some justification, and this PR provides just that. The fact that Codex is encouraging this change does not mean much on its own, so I did my best to check the literature. Searching on Google Scholar yields a mere [four results](https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22cliquefree%22) for "cliquefree" and [423 results](https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22clique-free%22) for "clique-free". Based on these results, I think it is safe to say that "cliquefree" is quite idiosyncratic, and should be avoided. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	12/12	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean	4	1	['github-actions']	b-mehta assignee:b-mehta	none	9-21691 9 days ago	24-39439 24 days ago	24-39479 24 days
30885	erdOne author:erdOne	chore(RingTheory): better defeqs for `PrimeSpectrum.preimageOrderIsoTensorResidueField`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	94/30	Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean	3	1	['github-actions']	chrisflav assignee:chrisflav	none	9-21687 9 days ago	19-53273 19 days ago	19-53319 19 days
30973	vihdzp author:vihdzp	feat: generalize `Finsupp.lex_lt_iff_of_unique`	--- - [x] depends on: #30481 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	46/13	Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Order/PiLex.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	none	9-21686 9 days ago	16-62904 16 days ago	16-71769 16 days
30984	erdOne author:erdOne	feat(RingTheory): lemmas about scaleRoots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	120/5	Mathlib/RingTheory/Polynomial/IntegralNormalization.lean,Mathlib/RingTheory/Polynomial/ScaleRoots.lean	2	2	['erdOne', 'github-actions']	chrisflav assignee:chrisflav	none	9-21684 9 days ago	17-32597 17 days ago	17-32698 17 days
30994	kim-em author:kim-em	feat: `fix_deprecations.py` script		CI	131/0	scripts/README.md,scripts/fix_deprecations.py	2	18	['SnirBroshi', 'github-actions', 'kim-em']	bryangingechen assignee:bryangingechen	none	9-21682 9 days ago	16-78180 16 days ago	16-78221 16 days
31011	YuvalFilmus author:YuvalFilmus	feat: properties of Chebyshev polynomials over the reals	Added several properties of the Chebyshev polynomials: - Degrees of T_n, U_n - Leading coefficients of T_n, U_n - Evaluations ofT_n, U_n at the endpoints ±1 - T_n is bounded on [-1, 1], and vice versa - Zeroes of T_n and U_n, and extrema of T_n - Normalized T_n minimizes the maximum absolute value over [-1, 1] for monic polynomials --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	989/5	Mathlib.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/RingTheory/Polynomial/Chebyshev.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Basic.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Monic.lean	7	22	['Ruben-VandeVelde', 'YuvalFilmus', 'github-actions', 'plp127']	Vierkantor assignee:Vierkantor	none	9-21677 9 days ago	16-55372 16 days ago	16-55399 16 days
19046	j-loreaux author:j-loreaux	feat: define class `SemigroupAction`	--- If I can get this building with minimal performance impact, I would like to change the names to: `MulAction → MonoidAction` `SemigroupAction → MulAction` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	48/26	Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/RingTheory/Trace/Basic.lean	13	12	['alreadydone', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	jcommelin assignee:jcommelin	none	8-31202 8 days ago	77-37951 2 months ago	83-65231 83 days
30318	joelriou author:joelriou	feat(Algebra/ModuleCat/Presheaf): composition of pushforwards and pullbacks and compatibilites	The composition of two pullback functors on presheaves of modules `pullback φ ⋙ pullback ψ` identifies to the pullback of the composition. We show compatibilites for these isomorphisms: they are deduced from similar identifies for pushforwards (in which case they are `rfl`). --- - [x] depends on: #30335 This PR continues the work from #17589. Original PR: https://github.com/leanprover-community/mathlib4/pull/17589	t-algebra t-algebraic-geometry t-category-theory label:t-algebra$	121/14	Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	none	8-21700 8 days ago	15-50422 15 days ago	15-50441 15 days
30696	joelriou author:joelriou	feat(Order/Category): `PardOrdEmb` has filtered colimits	--- - [x] depends on: #30693 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	161/2	Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/Order/Category/PartOrdEmb.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	Vierkantor assignee:Vierkantor	none	8-21696 8 days ago	15-72346 15 days ago	15-72373 15 days
30757	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): `singletonGraph` and `subgraphOfAdj` are trees	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	30/1	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	3	1	['github-actions']	kmill assignee:kmill	none	8-21694 8 days ago	23-42155 23 days ago	23-42198 23 days
30771	dagurtomas author:dagurtomas	chore(CategoryTheory): move `Closed` directory into `Monoidal`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed	36/36	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Category/Cat/CartesianClosed.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Closed/Enrichment.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Groupoid.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Closed/Types.lean,Mathlib/CategoryTheory/Monoidal/Closed/Zero.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Preadditive/Projective/Internal.lean,Mathlib/CategoryTheory/Sites/CartesianClosed.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/CartesianClosed.lean,Mathlib/Condensed/Light/CartesianClosed.lean	27	3	['github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	none	8-21693 8 days ago	16-4913 16 days ago	23-9293 23 days
30826	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): map a walk to its own subgraph	While this is not very interesting on its own, it opens the possibility of mapping a walk to any graph, given a graph homomorphism from the walk's subgraph. --- Related: #30590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	b-mehta assignee:b-mehta	none	8-21691 8 days ago	21-51039 21 days ago	21-51083 21 days
30827	dagurtomas author:dagurtomas	feat(Condensed): constructions for light condensed objects can be done in an equivalent small category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-condensed	36/2	Mathlib/Condensed/Light/Small.lean	1	1	['github-actions']	joneugster assignee:joneugster	none	8-21690 8 days ago	21-49832 21 days ago	21-49871 21 days
30877	YaelDillies author:YaelDillies	feat(Algebra/MonoidAlgebra): extend the `R[M]` notation to `MonoidAlgebra R M`	It currently only is notation for `AddMonoidAlgebra R M`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	212/161	Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.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,MathlibTest/Algebra/MonoidAlgebra/Defs.lean	9	17	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	jcommelin assignee:jcommelin	none	8-21689 8 days ago	16-45429 16 days ago	16-75966 16 days
31054	jsm28 author:jsm28	feat(LinearAlgebra/AffineSpace/Simplex/Basic): faces and `reindex`	Add lemmas about the set of vertices of a `face` or `faceOpposite` of `Simplex.reindex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	14/0	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	1	['github-actions']	kim-em assignee:kim-em	none	8-21684 8 days ago	15-69240 15 days ago	15-69215 15 days
30678	YaelDillies author:YaelDillies	refactor(Algebra/Quaternion): intermediate `Module` instance	This `Module` instance allows me to not ungeneralise the `NoZeroSMulDivisors R ℍ[R,c₁,c₂,c₃]` in #30563. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	45/28	Mathlib/Algebra/Quaternion.lean	1	20	['YaelDillies', 'eric-wieser', 'github-actions']	joneugster assignee:joneugster	none	7-79977 7 days ago	24-79039 24 days ago	25-17375 25 days
30416	SnirBroshi author:SnirBroshi	feat(Logic/Relation): lemmas relating `Relation.Map` and `Function.onFun`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	32/0	Mathlib/Logic/Relation.lean	1	1	['github-actions']	awainverse assignee:awainverse	none	7-59797 7 days ago	34-40497 1 month ago	34-42722 34 days
30962	WangYiran01 author:WangYiran01	feat(Combinatorics/Enumerative): add lattice path lemmas and counts	This PR adds definitions and theorems about monotone lattice paths: - Defines `pathCount`, `pathCountFrom`, `SubdiagProp`, and related structures. - Proves closed forms such as `pathCount_eq_closed`. - Adds Dyck/ballot subdiagonal property (`SubdiagProp`). All code builds successfully with `lake build`.	new-contributor t-combinatorics	64/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/RecLatticePath.lean	2	1	['github-actions']	awainverse assignee:awainverse	none	7-21703 7 days ago	17-84204 17 days ago	17-84242 17 days
31072	euprunin author:euprunin	golf(Combinatorics/Quiver/Path): golf `exists_eq_comp_and_notMem_tail_of_mem_vertices` using `grind`	--- Show trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices`: 38 ms before, 46 ms after ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` before PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..35d3daa185 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.039993] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.038334] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.036860] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036855] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036851] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e [… 447 lines omitted …] have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014253] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014250] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014246] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014243] ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014240] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this [Elab.step] [0.014235] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this Build completed successfully (521 jobs). ``` ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` after PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..d658dc1eb1 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), @@ -230,18 +231,7 @@ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.ver intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e - have h_no_tail : v ∉ q₂'.vertices.tail := by - intro hmem - have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by - simpa [q₂', vertices_cons, concat_eq_append] using hmem - cases hq2 : q₂.vertices with - \| nil => simp [hq2] at hmem' - \| cons y ys => - have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' - obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in - · exact h_not_tail <\| by simpa [hq2] - · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last - exact hxe_ne this + have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.047236] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.045901] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.044896] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044892] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044888] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => [… 96 lines omitted …] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.029274] refine no_implicit_lambda% (have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025886] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025862] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025858] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025854] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025851] ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025848] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.025842] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.022111] have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] [Elab.step] [0.022085] focus refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022082] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022079] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021564] case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021552] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021549] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021546] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021542] (grind [vertices_cons, end_cons]) [Elab.step] [0.021539] grind [vertices_cons, end_cons] [Elab.step] [0.021535] grind [vertices_cons, end_cons] [Elab.step] [0.021527] grind [vertices_cons, end_cons] Build completed successfully (521 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	1/12	Mathlib/Combinatorics/Quiver/Path/Vertices.lean	1	1	['github-actions']	b-mehta assignee:b-mehta	none	7-21701 7 days ago	15-32825 15 days ago	15-32865 15 days
31077	peabrainiac author:peabrainiac	feat(Topology): `nhdsSetWithin` filter	Add a relative version `nhdsSetWithin` of `nhdsSet`, analogous to `nhdsWithin`. The main application of this is a slightly more general variant of the tube lemma (`generalized_tube_lemma_left`) that came up while working in analysis files. --- - [x] depends on: #31090 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	159/4	Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Defs/Filter.lean,Mathlib/Topology/NhdsWithin.lean	4	7	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'peabrainiac', 'plp127']	fpvandoorn assignee:fpvandoorn	none	7-21700 7 days ago	14-46770 14 days ago	14-80093 14 days
31086	kckennylau author:kckennylau	feat(Util): open unscoped	`open unscoped Foo` opens the namespace `Foo` without activating its scope, meaning without activating any of its scoped instances or notations. Example usage: ```lean namespace Nat def pi : Nat := 3 scoped notation "π" => pi end Nat open unscoped Nat #check pi #check π -- error ``` --- Zulip: * [lean4 > Why "scoped notation" for Euler's totient function?](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Why.20.22scoped.20notation.22.20for.20Euler's.20totient.20function.3F/with/547890198) * [mathlib4 > open unscoped](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/open.20unscoped/with/547890545) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	82/0	Mathlib.lean,Mathlib/Util/OpenUnscoped.lean,MathlibTest/Util/OpenUnscoped.lean	3	1	['github-actions']	robertylewis assignee:robertylewis	none	7-21699 7 days ago	14-76642 14 days ago	14-76677 14 days
31087	joelriou author:joelriou	feat(CategoryTheory/Sites): categories of sheaves on Over categories, as a pseudofunctor	Given a Grothendieck topology `J` on a category `C` and a category `A`, we define the pseudofunctor `J.pseudofunctorOver A : Pseudofunctor (LocallyDiscrete Cᵒᵖ) Cat` which sends `X : C` to the category of sheaves on `Over X` with values in `A`. In order to do this, we expand the API for pushforward of sheaves for continuous functors. We add a few pseudofunctor-like definitions for these pushforwards. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	190/7	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/PseudofunctorSheafOver.lean	5	1	['github-actions']	dagurtomas assignee:dagurtomas	none	7-21698 7 days ago	14-72910 14 days ago	14-72884 14 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/)	new-contributor t-algebra label:t-algebra$	19/0	Mathlib/Algebra/Group/ForwardDiff.lean	1	9	['FlAmmmmING', 'Ruben-VandeVelde', 'github-actions']	dagurtomas assignee:dagurtomas	none	7-21697 7 days ago	14-58930 14 days ago	14-58972 14 days
27971	smmercuri author:smmercuri	feat: weak approximation theorems for infinite places of a number field	Under the diagonal embedding into infinite places, a number field $K$ is dense inside both the product $\prod_{v \mid \infty} (K, v)$, where $(K, v)$ denotes $K$ equipped with $v$'s topology, and the infinite adele ring $\prod_v K_v$. This PR continues the work from #22153. Original PR: https://github.com/leanprover-community/mathlib4/pull/22153 --- - [x] depends on: #27969	FLT t-algebra t-number-theory label:t-algebra$	98/2	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	3	8	['faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	Vierkantor assignee:Vierkantor	none	6-70867 6 days ago	24-83673 24 days ago	42-31819 42 days
30647	JovanGerb author:JovanGerb	chore(Tactic/Ring): use Qq more honestly	This PR removes almost all uses of `(q(...) : Expr)` in the `ring` tactic implementation. This includes switching from `Ring`/`DivisionSemiring` to `CommRing`/`Semifield`, because then we can rely on `assumeInstancesCommute` to make Qq happy. This should not affect the generality of the `ring` tactic, because a `Ring`/`DivisionSemiring` that is also commutative is also a `CommRing`/`Semifield`. I wanted to do some other work on `ring`, but that stumbled on the fact that some `q(...)` proof terms weren't actually being type checked properly by Qq. This PR fixes this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	136/118	Mathlib/Tactic/Ring/Basic.lean	1	12	['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'thorimur']	thorimur assignee:thorimur	none	6-33885 6 days ago	26-69545 26 days ago	26-69529 26 days
30669	harahu author:harahu	doc(Algebra): fix typos	Found with help from Codex. I've tried to limit the PR to changes that are easy to review. --- Should you find it difficult to review any particular part of this PR, know that I have nothing against trimming this PR down in favor of smaller free-standing PRs for the difficult-to-review parts. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	46/46	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/CharZero/AddMonoidHom.lean,Mathlib/Algebra/Field/Action/ConjAct.lean,Mathlib/Algebra/Field/Power.lean,Mathlib/Algebra/Field/ULift.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/SkewMonoidAlgebra/Single.lean,Mathlib/Algebra/Star/NonUnitalSubsemiring.lean	31	1	['github-actions']	kim-em assignee:kim-em	none	6-27614 6 days ago	25-70192 25 days ago	25-74836 25 days
30144	alreadydone author:alreadydone	feat(Data/Nat): kernel reducible binaryRec	+ Redefine `Nat.binaryRec` to allow kernel reduction. + Move some lemmas from Data/Nat/Bitwise to Data/Nat/BinaryRec. + Use `nsmulBinRec` for nsmul/zsmul on elliptic curves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	90/35	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/BitIndices.lean,Mathlib/Data/Nat/Bitwise.lean	6	8	['alreadydone', 'astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	pechersky assignee:pechersky	none	6-21713 6 days ago	14-26619 14 days ago	40-23880 40 days
31113	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya.lean): Add additional theorem in `Polya.lean`	-- depend on #30525 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	298/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	none	6-21702 6 days ago	14-1541 14 days ago	14-1590 14 days
28719	mitchell-horner author:mitchell-horner	refactor: redefine `IsTuranMaximal`	Redefined `IsTuranMaximal := G.IsExtremal (CliqueFree · (r + 1))` and - replaced `classical` in `IsTuranMaximal.le_iff_eq` with `DecidableRel` - refactored `turanGraph.instDecidableRelAdj`, `turanGraph_zero`, `exists_isTuranMaximal` - added `open Fintype` - replaced `simp only` with `rw` or `simp_rw` --- - [x] depends on: #28721 - [x] depends on: #29054 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	33/46	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	12	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vihdzp']	kmill assignee:kmill	1	6-12429 6 days ago	46-81707 1 month ago	74-14425 74 days
27258	JovanGerb author:JovanGerb	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	335/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	10	['JovanGerb', 'dwrensha', 'github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	none	5-29966 5 days ago	52-53795 1 month ago	52-55072 52 days
30987	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/SpecialLinearGroup): special linear group of a module	Define the special linear group of a module. Relate it with `Matrix.SpecialLinearGroup`. Several additional constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	467/14	Mathlib.lean,Mathlib/LinearAlgebra/Charpoly/BaseChange.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Dual.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	8	44	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'mattrobball', 'mcdoll', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	none	4-65555 4 days ago	16-22570 16 days ago	16-71611 16 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/)		348/338	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	7	['JovanGerb', 'github-actions', 'jsm28']	robertylewis assignee:robertylewis	none	4-62649 4 days ago	20-65917 20 days ago	20-65890 20 days
22782	alreadydone author:alreadydone	feat(Topology): étalé space associated to a predicate on sections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	886/160	Mathlib.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	10	16	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	none	4-26709 4 days ago	100-26350 3 months ago	30-3459 30 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/)	t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	17	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp']	kim-em assignee:kim-em	none	4-21699 4 days ago	186-26093 6 months ago	252-26062 252 days
27306	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	This PR continues the work from #22196. Original PR: https://github.com/leanprover-community/mathlib4/pull/22196	t-meta	810/2	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	13	['JovanGerb', 'github-actions', 'grunweg', 'xyzw12345']	JovanGerb assignee:JovanGerb	none	3-66586 3 days ago	66-12304 2 months ago	113-65777 113 days
30171	smmercuri author:smmercuri	feat(DedekindDomain/AdicValuation): `le_one` lemmas for `HeightOneSpectrum.valuation` and specialisations to `Rat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	48/0	Mathlib/RingTheory/Coprime/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Operations.lean	3	7	['erdOne', 'github-actions', 'smmercuri']	erdOne assignee:erdOne	none	3-66548 3 days ago	41-52652 1 month ago	41-52680 41 days
30797	adamtopaz author:adamtopaz	feat(Mathlib/Tactic/CategoryStar): Category*	We introduce `Category`, an elaborator for introducing category instances which behaves analogously to `Type`. Specifically, when writing `Category* C` this elaborator does the following: 1. It creates a new universe parameter `v`, and the elaborated term becomes `Category.{v} C`. 2. It places `v` just before the universe parameters appearing in `C` or its type, as commonly done in the category theory library. Basic usage: ```lean variable (C : Type) [Category C] variable (D : Type) [Category D] ``` This is essentially equivalent to: ```lean universe v_1 u_1 variable (C : Type u_1) [Category.{v_1} C] universe v_2 u_2 variable (D : Type u_2) [Category.{v_2} D] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	229/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/CategoryStar.lean,MathlibTest/CategoryTheory/CategoryStar.lean	4	26	['JovanGerb', 'adamtopaz', 'github-actions', 'mattrobball']	thorimur assignee:thorimur	none	3-63402 3 days ago	22-34577 22 days ago	22-35373 22 days
28884	kim-em author:kim-em	chore: deprecate ShiftLeft Int instance	This PR proposes deprecating the `ShiftLeft Int` instance (which allows bit-shifting an integer by an integer), and similarly for `ShiftRight`. These are unused in Mathlib. I'm happy if someone wants to keep this, but I would ask that they: * fix the doc-strings to explain what happens for negative shifts * ~~restores the theorem `Int.shiftLeft_add` which I've commented out on `nightly-testing` (and then revert b33c9d7aaea on `nightly-testing`).~~ * ideally but optionally, complete the API, e.g. reducing shifts by casts back to shifts by a Nat	t-data	22/3	Mathlib/Data/Int/Bitwise.lean	1	9	['Rob23oba', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'pechersky']	pechersky assignee:pechersky	none	1-35845 1 day ago	59-21721 1 month ago	80-76214 80 days
30213	SnirBroshi author:SnirBroshi	feat(Data/List/GetD): golf and add lemmas for `get` and `getElem?`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	18/16	Mathlib/Data/List/GetD.lean	1	11	['SnirBroshi', 'eric-wieser', 'github-actions', 'themathqueen']	pechersky assignee:pechersky	none	1-21700 1 day ago	18-20459 18 days ago	39-73891 39 days
30594	j-loreaux author:j-loreaux	feat: generalize continuity results for the continuous functional calculus	Under suitable conditions `x ↦ cfc f (a x)` is continuous. Previously these conditions were that there was a single compact set on which `f` was continuous, and which contained the spectra of all `a x`. However, this is a bit too stringent for some purposes and so we generalize it here. In particular, it suffices that the spectra `a x` are covered by a family of compact sets `s x` (on each of which `f` is continuous) satisfying the property that each `s x₀` contains the spectra `a x` for `x` sufficiently close to `x₀`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	144/53	Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Continuity.lean	1	4	['dupuisf', 'github-actions', 'j-loreaux']	ADedecker and dupuisf assignee:dupuisf assignee:ADedecker	none	0-46574 12 hours ago	29-34596 29 days ago	29-34582 29 days
30842	kim-em author:kim-em	feat: add Aristotle task for command palette	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	128/0	.vscode/tasks.json,scripts/README.md,scripts/aristotle/README.md	3	17	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'vikram-shanker']	robertylewis assignee:robertylewis	1	0-42653 11 hours ago	21-11050 21 days ago	21-11086 21 days
26770	Jun2M author:Jun2M	feat(Combinatorics/Graph) : subgraph relations on `Graph`	This PR creates a new file `Combinatorics/Graph/Subgraph.lean`. In it, the PR introduces a partial order on graphs by subgraph relation, defines relations `IsInducedSubgraph`, `IsSpanningSubgraph` and `IsClosedSubgraph`. Further, it introduce operations `EdgeRestrict`, `EdgeDelete`, `induce` and `VertexDelete`. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	363/1	Mathlib.lean,Mathlib/Combinatorics/Graph/Basic.lean,Mathlib/Combinatorics/Graph/Subgraph.lean	3	1	['github-actions']	awainverse assignee:awainverse	none	0-13912 3 hours ago	132-33179 4 months ago	132-33210 132 days

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

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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
30107	grunweg author:grunweg	chore: track occurrences of 'nonrec' as technical debt	Matches leanprover-community/leanprover-community.github.io#689: only merge when that is deemed a good idea. -------- TODO: make the count more robust, for instance count all occurrences of "^nonrec " plus those of "^[private\|protected] nonrec ". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI	1/0	scripts/technical-debt-metrics.sh	1	1	['github-actions']	robertylewis assignee:robertylewis	36-21704 1 month ago	43-80992 1 month ago	43-80967 43 days
31388	b-mehta author:b-mehta	feat(Topology/Order): add unordered versions of topological Rolle's theorem	To support this, we also add lemmas about extending functions from unordered intervals, and take the liberty of using `variable` more in that file, and removing an `erw`. The motivation here is that this is useful infrastructure for an unordered/central version of Taylor's theorem, as discussed here: [#maths > Taylor's theorem @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem/near/402571017). As such, this PR also originates from the Exponential Ramsey project. The PR currently makes a couple of different changes, but the overall diff is relatively small, and helps to motivate some of the changes, so I elected to keep it one PR for now, unless other maintainers would prefer it to be split up or further explained.	tech debt t-analysis awaiting-author	107/24	Mathlib/Order/Interval/Set/UnorderedInterval.lean,Mathlib/Topology/Order/DenselyOrdered.lean,Mathlib/Topology/Order/ExtendFrom.lean,Mathlib/Topology/Order/LeftRight.lean,Mathlib/Topology/Order/Rolle.lean	5	n/a	['ADedecker', 'b-mehta', 'github-actions', 'j-loreaux', 'mcdoll', 'plp127']	nobody	2-46134 2 days ago	unknown	unknown
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/)	tech debt t-computability merge-conflict	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	452-38523 1 year ago	492-62838 1 year 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/)	tech debt merge-conflict awaiting-author	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	451-48488 1 year ago	452-37635 1 year ago	7-18420 7 days
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	419-47991 1 year ago	419-47991 1 year ago	8-1989 8 days
20872	grunweg author:grunweg	feat: lint against the tactic.skipAssignedInstances option in mathlib	This means we can remove the corresponding technical debt entry. We also correct some outdated details in the Linter/Style.lean docstring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict awaiting-author	63/7	Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/Separation/Regular.lean,MathlibTest/LintStyle.lean,scripts/technical-debt-metrics.sh	5	17	['adomani', 'github-actions', 'grunweg']	nobody	288-37697 9 months ago	288-37697 9 months ago	0-9411 2 hours
22682	grunweg author:grunweg	chore(Topology/Homeomorph): split out various constructions	This makes `Homeomorph.lean` slightly more manageable, and also is a mild import reduction. edit: also split out IsHomeomorph, as this allows removing the dependencies on Constructions. Let's see if this gains much --- I don't feel strongly about this PR, but we might as well take it. - [ ] depends on: #22681 - [ ] depends on #22827 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology RFC merge-conflict	341/290	Mathlib.lean,Mathlib/Topology/Category/TopCat/ULift.lean,Mathlib/Topology/Homeomorph/Constructions.lean,Mathlib/Topology/Homeomorph/IsHomeomorph.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/NoetherianSpace.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	227-10317 7 months ago	227-10317 7 months ago	14-35834 14 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	219-77738 7 months ago	220-10907 7 months ago	10-21608 10 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/)	tech debt merge-conflict awaiting-author	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	172-60891 5 months ago	172-60893 5 months ago	34-33204 34 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/)	tech debt t-linter merge-conflict 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	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	470-82138 1 year ago	492-62838 1 year ago	0-15202 4 hours

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
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/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	192-30873 6 months ago	192-30882 6 months 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/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	192-30184 6 months ago	192-30819 6 months ago	75-77754 75 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/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	162-83044 5 months ago	192-30783 6 months ago	48-67492 48 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/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	159-40435 5 months ago	159-40436 5 months ago	34-10595 34 days
30526	SnirBroshi author:SnirBroshi	chore(Logic/Relation): use `Subrelation` to state theorems	chore(Logic/Relation): replace every `∀ x y, r x y → r' x y` with `Subrelation r r'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	79/73	Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/Interval/Finset/Basic.lean	7	4	['SnirBroshi', 'github-actions', 'thorimur', 'vihdzp']	thorimur assignee:thorimur	22-22221 22 days ago	22-22254 22 days ago	8-76821 8 days
30668	astrainfinita author:astrainfinita	feat: `QuotLike`	This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotLike` 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. - Maybe `QuotLike` isn't the appropriate name. It may suggest that this typeclass is similar to `FunLike` and `SetLike`, but it is not. [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	t-data awaiting-zulip RFC awaiting-author	743/0	Mathlib.lean,Mathlib/Data/QuotLike.lean,MathlibTest/QuotLike.lean	3	14	['YaelDillies', 'astrainfinita', 'github-actions', 'vihdzp']	nobody	19-83057 19 days ago	19-83057 19 days ago	0-81 1 minute
30902	adomani author:adomani	chore: longLine warnings happen starting at the 101st character	Right now, the longLine linter warning spans the whole line. This PR changes the behaviour and the warning only covers the characters exceeding the 100 character limit. Previous discussion: [#general > error lens in lean4 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/error.20lens.20in.20lean4/near/547074537) Specific thread: [#mathlib4 > Restrict longLine warning to exceeding characters @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Restrict.20longLine.20warning.20to.20exceeding.20characters/near/547081669) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-linter	1/1	Mathlib/Tactic/Linter/Style.lean	1	1	['github-actions']	nobody	19-36999 19 days ago	19-37256 19 days ago	0-132 2 minutes
11800	JADekker author:JADekker	feat : Define 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/)	awaiting-zulip t-topology merge-conflict please-adopt	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	424-7906 1 year ago	424-29881 1 year ago	119-10687 119 days
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order t-algebra merge-conflict label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'j-loreaux']	nobody	358-67556 11 months ago	358-67556 11 months ago	33-64877 33 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	203-22933 6 months ago	214-51563 7 months ago	29-60989 29 days
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/)	awaiting-zulip t-algebra merge-conflict 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	132-11182 4 months ago	132-11182 4 months 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/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	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	132-10020 4 months ago	132-10021 4 months ago	6-51040 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	awaiting-zulip slow-typeclass-synthesis t-algebra t-analysis merge-conflict 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	72-25665 2 months ago	72-25666 2 months ago	0-20585 5 hours
28925	grunweg author:grunweg	chore: remove `linear_combination'` tactic	When `linear_combination` was refactored in #15899, the old code was kept as the `linear_combination'` tactic, for easier migration. The consensus of the zulip discussion ([#mathlib4 > Narrowing the scope of `linear_combination` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Narrowing.20the.20scope.20of.20.60linear_combination.60/near/470237816)) was to wait, and "revisit this once people have experienced the various tactics in practice". One year later, the old tactic has almost no uses: it is unused in mathlib; [searching on github](https://github.com/search?q=linear_combination%27%20path%3A*.lean&type=code) yields 37 hits --- all of which are in various forks of mathlib. Thus, removing this tactic seems appropriate. --- Do not merge before the zulip discussion has concluded! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed awaiting-zulip merge-conflict	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	29-2875 29 days ago	29-2876 29 days ago	0-1 1 second
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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	10-12565 10 days ago	178-52515 5 months ago	39-67601 39 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/)	large-import awaiting-zulip new-contributor t-category-theory t-meta merge-conflict	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	1-13749 1 day ago	1-13749 1 day ago	1-18384 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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	0-23482 6 hours ago	178-53440 5 months ago	45-84611 45 days
24614	JovanGerb author:JovanGerb	chore: rename field `inf` to `min` in `Lattice`	As suggested by @eric-wieser, this PR renames the `sup` and `inf` fields in `Lattice` to `max` and `min`. This means that we now can extend `Lattice` and `LinearOrder` simultaneously without ending up with duplicate fields. This should be implemented in a future PR for existing classes like `CompleteLinearOrder`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60sup.60.2F.60inf.60.20or.20.60max.60.2F.60min.60.20for.20set.20interval.20lemmas.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order merge-conflict	181/187	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subpresheaf/Basic.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Semiquot.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Concept.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/Preorder/Finsupp.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Basic.lean	84	15	['JovanGerb', 'bryangingechen', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	0-13531 3 hours ago	2-31932 2 days ago	24-8021 24 days
17518	grunweg author:grunweg	feat: lint on declarations mentioning `Invertible` or `Unique`	Using the same infrastructure as for #10235. Depends on that PR to land first, and also (for the first lint) a zulip discussion if that change is desired/about the best way to enact it. --- - [ ] depends on: #10235	awaiting-zulip t-linter merge-conflict blocked-by-other-PR	149/7	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	376-48025 1 year ago	402-36547 1 year ago *	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/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	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	192-30833 6 months ago	192-30838 6 months ago	0-179 2 minutes

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
12936	mattrobball author:mattrobball	chore(Quiver.Opposite): make `Quiver.Hom.op/unop` `abbrev`'s	These are wrappers around the constructor and projection for `Opposite Quiver.Hom _ _`. The projection itself is reducible and with structure eta built in to defeq it seems like we might be making Lean work harder than is necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	39/34	Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/CategoryTheory/Idempotents/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Triangulated/Opposite.lean,Mathlib/Combinatorics/Quiver/Basic.lean	10	9	['YaelDillies', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	470-82138 1 year ago	538-48130 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict 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	470-82135 1 year ago	504-70037 1 year ago	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	470-82134 1 year ago	492-62838 1 year ago	35-56459 35 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/)	t-algebra merge-conflict label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	470-82133 1 year ago	492-62838 1 year ago	83-76369 83 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/)	t-algebra merge-conflict 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	470-82133 1 year ago	492-62838 1 year ago	102-21189 102 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/)	t-data merge-conflict	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	456-75678 1 year ago	456-75678 1 year 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/)	tech debt t-computability merge-conflict	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	452-38523 1 year ago	492-62838 1 year ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	452-38382 1 year ago	492-62838 1 year ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	452-38281 1 year ago	492-62838 1 year ago	29-14218 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/)	t-data new-contributor merge-conflict	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	451-59435 1 year ago	456-75677 1 year ago	54-52408 54 days
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	419-47991 1 year ago	419-47991 1 year ago	8-1989 8 days
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	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	410-10374 1 year ago	410-10374 1 year ago	4-72805 4 days
8029	alreadydone author:alreadydone	refactor: Homotopy between Functions not ContinuousMaps	This allows talking about homotopies without needing to supply proofs of continuity for the two ends. This for example simplifies the definition of H-spaces. Of course, if a homotopy exists between two functions, those two functions are automatically continuous because they are restrictions of the homotopy (which is continuous) to subspaces. `Homotopy.refl` still needs a continuous map as input, and `Homotopic` is only an equivalence relation when restricted to ContinuousMap. --- TODO: fix docstrings [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology RFC merge-conflict	246/250	Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean	8	3	['alreadydone', 'urkud']	nobody	400-39179 1 year ago	492-62838 1 year ago	9-20043 9 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/)	new-contributor t-order t-algebra merge-conflict 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	373-5840 1 year ago	373-5840 1 year ago	7-45599 7 days
12778	MichaelStollBayreuth author:MichaelStollBayreuth	perf: decouple algebraic and order hierarchies in type class search	Based on the experience gained with [#12680](https://github.com/leanprover-community/mathlib4/pull/12680), this attempts to decouple the algebraic and order hierarchies in type class search. * We lower the priorities of instances like `OrderedSemiring.toSemiring` (which are generated by the `extends` clause with default priority 1000) to 50. * Additionally, we make the default priority available via `open scoped AlgebraOrderInstances` and use that where appropriate. Motivation: Looking at instance synthesization traces, it appears that when (e.g.) presented with the goal to find a `Semiring` instance, the algorithm frequently goes down a rabbit hole trying and failing to find order instances. This seems to be caused by the presence of instances like `OrderedSemiring.toSemiring` with default priority, which are tried early in the search, but lead nowhere (after a fairly long time). These instances are created by declarations of the form ```lean class OrderedSemiring (α : Type u) extends Semiring α, OrderedAddCommMonoid α where ... ``` which automatically sets up (among other things) an instance `OrderedSemiring.toSemiring` with default piority. It appears that these instances cannot be removed completely (only locally in a module), so the next best solution is to make them low priority (which is possible also for downstream modules). To provide for situations where these instances are desired, we put a default priority version in the scope `AlgebraOrderInstances`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict label:t-algebra$	306/27	Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/Submodule/Order.lean,Mathlib/Algebra/Order/AbsoluteValue.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/Antidiag/Prod.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/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/List.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Floor.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Pointwise.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/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Polynomials.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Multiset.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Nat/Cast/Field.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Choose/Bounds.lean,Mathlib/Data/PNat/Factors.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Set/Pointwise/Interval.lean	135	34	['MichaelStollBayreuth', 'YaelDillies', 'github-actions', 'leanprover-bot']	nobody	373-4743 1 year ago	373-4743 1 year ago	18-19513 18 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/)	t-algebra merge-conflict label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	352-68995 11 months ago	352-68995 11 months ago	7-68492 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/)	t-data merge-conflict	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	350-45072 11 months ago	350-45072 11 months ago	4-60621 4 days
18756	astrainfinita author:astrainfinita	refactor: deprecate `DistribMulActionSemiHomClass` `MulSemiringActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	339-10741 11 months ago	339-10741 11 months ago	31-75259 31 days
18748	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `ContinuousLinearMapClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	115/49	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/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/Homeomorph.lean	10	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	332-61154 10 months ago	332-61157 10 months ago	0-989 16 minutes
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/)	t-topology merge-conflict	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	304-57947 10 months ago	304-57947 10 months ago	6-66637 6 days
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	302-44977 9 months ago	302-44977 9 months 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/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	289-69234 9 months ago	289-69234 9 months ago	27-43617 27 days
21099	chrisflav author:chrisflav	chore(RingTheory/Generators): use unification hints for variables and relations	When working with generators and presentations, we rely on the `MvPolynomial` API, but since the type of variables is bundled in `Generators R S`, many lemmas don't apply with `rw` or `simp`, because they can't see through the definition of `vars` in constructions such as `Generators.comp` and `Generators.localizationAway`. A possible approach is to make all of these constructions `abbrev`s, but this causes `simp` to also unfold `val` which is not always desirable. More generally, it is then harder to predict how instance search and `simp` behave. This approach is tried in #21050, but causes many regressions. This approach is less invasive, as it uses `unif_hint` to unify the `vars` (and `rels`) fields of constructions with the correct type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	231/91	Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/RingTheory/Generators.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	5	16	['chrisflav', 'erdOne', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	263-52212 8 months ago	263-52212 8 months ago	27-75210 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/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	253-55255 8 months ago	253-55255 8 months ago	16-76141 16 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/)	t-algebra merge-conflict label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	241-77510 7 months ago	241-77510 7 months ago	10-48025 10 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	221-31024 7 months ago	221-31024 7 months ago	30-8337 30 days
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	219-77738 7 months ago	220-10907 7 months ago	10-21608 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/)	new-contributor t-category-theory merge-conflict	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	218-63657 7 months ago	218-63658 7 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	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	218-63655 7 months ago	218-63657 7 months ago	43-83249 43 days
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	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	213-2221 6 months ago	213-2223 6 months ago	55-52030 55 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	212-33514 6 months ago	460-71844 1 year ago	4-79214 4 days
20567	grunweg author:grunweg	feat(Cache): two small features	- add an informational message to the get command (when run without arguments): when more than 80% of all cache files present were not used in the last command, tell the user about the `clean` command --- - [ ] depends on #20568 (for the first feature) - [ ] TODO: re-design this feature and the clean command: if there are N local copies of mathlib, cache should have a pointer to all of them - to avoid clearing all N-1 from inside the last local copy [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	38/2	Cache/Main.lean	1	11	['Julian', 'arthurpaulino', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	210-37617 6 months ago	210-37617 6 months ago	1-17369 1 day
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/)	t-topology merge-conflict	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	205-76531 6 months ago	205-76534 6 months 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/)	t-order merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	203-53306 6 months ago	203-53308 6 months 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/)	t-algebra merge-conflict 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	203-42003 6 months ago	203-42004 6 months ago	2-12022 2 days
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	198-46407 6 months ago	198-46408 6 months ago	0-4604 1 hour
13649	FR-vdash-bot author:FR-vdash-bot	chore: redefine `Nat.div2` `Nat.bodd`	The new definitions are faster than the old ones. `Nat.binaryRec` will be moved to batteries (https://github.com/leanprover-community/batteries/pull/799) or core (https://github.com/leanprover/lean4/pull/3756), so relevant contents are moved to a new file temporarily. --- - [x] depends on: #15567 - [x] depends on: #19666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	195-25553 6 months ago	195-25555 6 months ago	87-51692 87 days
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	194-83788 6 months ago	194-83788 6 months ago	7-68358 7 days
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	193-58535 6 months ago	193-58536 6 months ago	26-25420 26 days
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	172-61535 5 months ago	172-61537 5 months ago	30-35190 30 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). --- - [ ] depends on: #24570 - [ ] 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/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	171-67023 5 months ago	171-67026 5 months ago	43-17409 43 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/)	large-import new-contributor t-topology merge-conflict	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	170-48753 5 months ago	170-48755 5 months ago	35-30364 35 days
21182	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	Currently the `#count_heartbeat` linter reported the heartbeats until it concluded `error: [declaration] has already been declared` instead of re-elaborating the declaration. --- [Zulip report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/count_heartbeats.20for.20all.20declarations.20in.20a.20file.3F/near/496303652) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	163-77501 5 months ago	163-77502 5 months ago	64-19141 64 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/)	t-convex-geometry merge-conflict	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	159-71580 5 months ago	159-71582 5 months ago	6-40169 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/)	t-algebra t-topology merge-conflict 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	147-63321 4 months ago	147-63323 4 months 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/)	t-algebra t-topology merge-conflict 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	147-63319 4 months ago	147-63321 4 months 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/)	t-algebra t-topology merge-conflict 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	147-63318 4 months ago	147-63319 4 months 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/)	t-data merge-conflict	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	144-45609 4 months ago	382-71825 1 year ago	129-57991 129 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/)	t-combinatorics merge-conflict	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	28	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	132-11184 4 months ago	132-11185 4 months ago	72-51453 72 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/)	t-algebra merge-conflict 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	132-10269 4 months ago	132-10269 4 months ago	43-42841 43 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/)	t-algebraic-geometry merge-conflict	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	132-10023 4 months ago	132-10024 4 months ago	45-4961 45 days
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	132-10016 4 months ago	132-10016 4 months ago	11-84822 11 days
25573	JovanGerb author:JovanGerb	feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...`	This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	59/52	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Util/Delaborators.lean,MathlibTest/delaborators.lean	32	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-10004 4 months ago	132-10005 4 months ago	26-17604 26 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	t-algebraic-geometry merge-conflict	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	132-9711 4 months ago	132-9711 4 months ago	18-21880 18 days
26012	linesthatinterlace author:linesthatinterlace	feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom`	This PR continues the work from #25290. Original PR: https://github.com/leanprover-community/mathlib4/pull/25290	migrated-from-branch t-algebra merge-conflict label:t-algebra$	785/34	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	132-9706 4 months ago	132-9707 4 months ago	17-68773 17 days
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	350/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	18	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	131-48287 4 months ago	131-48288 4 months ago	73-67280 73 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/)	large-import t-topology merge-conflict	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	130-61540 4 months ago	130-61541 4 months 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/)	t-topology merge-conflict	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	128-77489 4 months ago	128-77489 4 months ago	20-8582 20 days
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [x] depends on: #24179 - [x] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	339/1	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	5	10	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	125-50791 4 months ago	126-9808 4 months ago	2-8297 2 days
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	111-40764 3 months ago	111-40765 3 months ago	23-63406 23 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/)	t-algebraic-topology infinity-cosmos t-meta merge-conflict	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	23	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	105-68366 3 months ago	105-68366 3 months ago	88-84229 88 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/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74751 3 months ago	101-74751 3 months ago	38-26044 38 days
11632	mattrobball author:mattrobball	chore(Group/RingTheory.Congruence): make `Quotient`'s reducible	These are essentially wrappers and should not expose any data when made reducible. Their use in constructing typeclass instances makes reducible transparency desirable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict	16/35	Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean	2	14	['eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mattrobball']	nobody	101-74698 3 months ago	101-74698 3 months ago	2-10495 2 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 --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	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	100-76673 3 months ago	100-76673 3 months ago	172-57747 172 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/)	t-ring-theory merge-conflict	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	100-76666 3 months ago	100-76666 3 months ago	0-0 0 seconds
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/)	CI merge-conflict	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	100-25704 3 months ago	100-25704 3 months 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/)	t-ring-theory merge-conflict	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	94-58207 3 months ago	94-58208 3 months 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/)	t-ring-theory large-import merge-conflict	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	94-57836 3 months ago	94-57837 3 months 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/)	t-meta merge-conflict	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	92-72460 3 months ago	92-72461 3 months ago	32-70098 32 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	92-62103 3 months ago	132-10010 4 months ago	29-56208 29 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/)	t-meta merge-conflict	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	92-27256 3 months ago	92-27256 3 months ago	71-28549 71 days
19097	Vierkantor author:Vierkantor	chore(Algebra.Polynomial): split `Polynomial/Basic.lean` into smaller files	This PR splits `Mathlib.Algebra.Polynomial.Basic` into the following files: * `Polynomial/Defs.lean`: definition and ring structure on `R[X]` * `Polynomial/Module.lean`: module structure on `R[X]` * `Polynomial/Monomial.lean`: merged definition of `monomial`, `X`, `C` into the existing file (this is probably the file you want to import from now on) * `Polynomial/EraseUpdate.lean`: definition of `erase` and `update` * `Polynomial/Sum.lean`: definition of `sum` Initially I added the monomial results to a new file, but ended up merging it with `Monomial.lean` since the two of them merge cleanly. --- - [x] depends on: #28030 (going to resurrect this PR on top of that one later) - [x] depends on: #19095 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3109/2500	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	40	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	86-70257 2 months ago	92-63042 3 months ago	0-0 0 seconds
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	86-30736 2 months ago	86-30737 2 months ago	0-83357 23 hours
28532	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes and extend more	Add the missing `NonAssocComm(Semi)ring` and modify existing classes to `extends` more to remove some manual instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	89/70	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Tactic/Ring/Basic.lean,MathlibTest/TCSynth.lean	10	17	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	85-50599 2 months ago	85-50600 2 months ago	2-77063 2 days
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	84-59862 2 months ago	84-59863 2 months ago	2-48353 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/)	t-algebra merge-conflict 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	83-65933 2 months ago	212-80938 6 months ago	52-31623 52 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/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	83-27178 2 months ago	83-27179 2 months 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/)	new-contributor merge-conflict	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	83-6498 2 months ago	105-68820 3 months 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/)	t-ring-theory merge-conflict	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	83-6452 2 months ago	83-6452 2 months 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/)	new-contributor merge-conflict	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	82-54730 2 months ago	105-68821 3 months ago	7-62439 7 days
25889	plp127 author:plp127	fix(Tactic/Widget/Conv): fix various issues	Fixes various issues with the `conv?` widget. Closes #25162. ([Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bug.20in.20.60conv.3F.60)) Specifically, fixes issues with `conv?` where - when converting a `SubExpr.Pos` to conv directions, it always uses the goal expression as reference, even when working on a hypothesis, this often leads to bad results and makes it unusable on hypotheses - it refuses to go all the way in to a function (for example in `Nat.succ 0`, you can't access `Nat.succ`) - it refuses to enter binders where the name of the bound variable contains the character `0` (try it on `∀ (x0 : Nat), x0 = x0`) - it panics if it can't find a binder name instead of just coming up with one itself, this also means usually you can't enter either side of a non-dependent arrow since those usually don't have binder names (try it on `False → False`) - you can't enter the type of a binder, you end up going into the body instead (try it on `fun (x : False) => (x.elim : False → Nat) x.elim`) - you can't partially enter a function, you end up going to the top argument after instead (for example, in the expression `id (id id) 0`, when you click on `id (id id)`, you end up going to `id id`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	419/84	Mathlib/Tactic/Widget/Conv.lean,MathlibTest/conv?.lean	2	5	['bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	bryangingechen and kmill assignee:kmill assignee:bryangingechen	81-43023 2 months ago	81-43024 2 months ago	70-58775 70 days
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	78-45442 2 months ago	78-45442 2 months ago	0-78027 21 hours
27785	staroperator author:staroperator	chore(Algebra/Group/Submonoid): golf `Nat.addSubmonoidClosure_one` using `simp`	This should improve the proof readability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	8/15	Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Order/Star/Basic.lean	3	9	['github-actions', 'joneugster', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	joneugster assignee:joneugster	78-11793 2 months ago	78-11794 2 months ago	26-34065 26 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/)	t-meta merge-conflict	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	78-11664 2 months ago	78-11665 2 months ago	16-54453 16 days
27566	wwylele author:wwylele	feat(Data/Real): Archimedean.embedReal is a ring hom when M is an ordered ring	Also shows that this ends up the same as `LinearOrderedField.inducedOrderRingHom` for fields --- This is a spin-off from #27268 ~~because I got bored~~ . This is not in a high priority as I don't need it for anything yet, but the last lemma shows that `embedReal` is a generalization of `LinearOrderedField.inducedOrderRingHom` (which is only stated for field, and I didn't find when I was making the group embedding). Perhaps we should refactor `Mathlib/Algebra/Order/CompleteField.lean` with the definition here. Indeed, if we replace every `ℝ` with `(R : Type*)[ConditionallyCompleteLinearOrderedField R]` in `Data/Real/Embedding.lean`, the proof still works. What do you think? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict	220/3	Mathlib/Data/Real/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	69-4783 2 months ago	69-4784 2 months ago	40-32085 40 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/)	t-category-theory merge-conflict	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	66-58010 2 months ago	66-58011 2 months 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/)	t-category-theory merge-conflict	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	66-53049 2 months ago	66-53837 2 months 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/)	t-category-theory merge-conflict	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	65-66900 2 months ago	66-53834 2 months 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 ---	new-contributor t-logic merge-conflict	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	65-60761 2 months ago	65-60762 2 months ago	21-3001 21 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/)	t-data merge-conflict	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	62-11394 2 months ago	62-11395 2 months 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	t-topology merge-conflict	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	59-73005 1 month ago	59-73006 1 month ago	87-79752 87 days
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`. --- - [ ] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	57-36797 1 month ago	unknown	unknown
29281	plp127 author:plp127	docs: `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/)	t-data merge-conflict	2/3	Mathlib/Data/Fin/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	53-65298 1 month ago	53-65299 1 month ago	18-38918 18 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/)	t-group-theory merge-conflict	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	50-84602 1 month ago	50-84603 1 month ago	20-39203 20 days
21950	erdOne author:erdOne	feat(NumberTheory/Padics): the completion of `ℚ` at a finite place is `ℚ_[p]`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict	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	48-59712 1 month ago	129-59649 4 months ago	79-1228 79 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/)	t-category-theory merge-conflict	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	45-49794 1 month ago	45-49795 1 month ago	0-5521 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/)	t-algebraic-topology t-category-theory merge-conflict	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	44-69196 1 month ago	44-69198 1 month 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/)	large-import t-category-theory merge-conflict	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	43-72421 1 month ago	43-75393 1 month ago	0-625 10 minutes
25042	alreadydone author:alreadydone	feat(Topology): restriction/extension of Trivialization and composition with Homeomorph	--- - [x] depends on: #25041 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	42-74865 1 month ago	42-74866 1 month ago	134-68375 134 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	t-order t-algebra merge-conflict 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	n/a	['YaelDillies', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	40-54136 1 month ago	unknown	unknown
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	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	36-76065 1 month ago	36-76066 1 month ago	25-78230 25 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/)	t-ring-theory merge-conflict	172/0	Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean	2	n/a	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	32-56267 1 month ago	unknown	unknown
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/)	t-analysis merge-conflict	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	30-12703 30 days ago	30-12704 30 days ago	0-14664 4 hours
30248	dwrensha author:dwrensha	chore: remove obsolete NormDigits namespace	In Lean 3, `nat.digits m n` with concrete numbers `m` `n` could be normalized via `norm_num`. [The logic enabling that](https://github.com/leanprover-community/mathlib3/blob/65a1391a0106c9204fe45bc73a039f056558cb83/src/data/nat/digits.lean#L599-L678) was partially ported over to Lean 4 in the `NormDigits` namespace, but never was completed. Independently, simprocs as introduced in Lean v4.6.0 made it so that `simp [Nat.digits, Nat.digitsAux]` could normalize `Nat.digits m n` without any need for the special `NormDigits` code. More recently, #25864 made it so that just plain `rfl` can normalize `Nat.digits m n` (but note that a revert PR has been proposed in #30246). Therefore, the `NormDigits` namespace is no longer relevent and should be deleted. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	0/102	Mathlib/Data/Nat/Digits/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	27-45426 27 days ago	27-45426 27 days ago	12-698 12 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	t-order merge-conflict	377/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-45123 21 days ago	94-2999 3 months ago	0-1908 31 minutes
30690	grunweg author:grunweg	style(Order): fix whitespace	Extracted from #30658. Found by extending the commandStart linter to proof bodies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	69/69	Mathlib/Order/Basic.lean,Mathlib/Order/Bounds/Image.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/KonigLemma.lean,Mathlib/Order/Max.lean,Mathlib/Order/Minimal.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/PiLex.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/SetIsMax.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/WithBot.lean	14	4	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	16-70302 16 days ago	16-70303 16 days ago	8-67789 8 days
29909	Vierkantor author:Vierkantor	feat(CI): add build output to CI workflows	This PR uses the Zulip build report script (originally developed for the nightly-regression-report workflow) to add a summary of build output to other Zulip posts about workflow results. This allows us to more easily see the origin of a failure. This requires redoing the script a little to make it a bit more flexible, and the output is slightly reformatted to become consistent across the various workflows (4 of them that post to Zulip). We don't do so for the nightly-testing failures, since those run in a different workflow, and it would be a lot of work to access the command output from another workflow. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	93/69	.github/workflows/daily.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly-regression-report.yml,scripts/zulip_build_report.sh	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	robertylewis assignee:robertylewis	10-11175 10 days ago	10-11175 10 days ago	41-48286 41 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/)	t-algebra merge-conflict 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	9-32865 9 days ago	9-32866 9 days ago	80-71575 80 days
30484	vihdzp author:vihdzp	refactor: override `≤` and `<` in `Function.Injective.semilatticeSup`, etc.	These constructors now take `LE` and `LT` instance arguments, and proofs that the "induced" relations are equal. This matches the behavior for all other data fields of the same constructors, which avoids diamonds which could otherwise arise. To recover the old behavior, you can instantiate `LE` and `LT` instances through `PartialOrder.lift` (if they don't exist already), and set the `le` and `lt` fields to `Iff.rfl`. --- I seem to have (somehow?) changed a syntactic equality on fractional ideals - given that this golfs various proofs and even removes a porting note, I think this change is desirable. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	392/382	Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Sites/Precoverage.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finsubgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/FieldTheory/Galois/GaloisClosure.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Order/CompleteSublattice.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/BoundedLattice.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/FractionalIdeal/Inverse.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/Topology/Algebra/Group/ClosedSubgroup.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean,Mathlib/Topology/ContinuousMap/Ordered.lean,Mathlib/Topology/DiscreteQuotient.lean,Mathlib/Topology/Sets/Closeds.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sets/Order.lean	56	32	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	8-9956 8 days ago	8-9957 8 days ago	5-71110 5 days
29877	Komyyy author:Komyyy	feat: inner product of the gradient	Also, this PR enables the `conj` notation in the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	37/10	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	7-61524 7 days ago	7-61526 7 days ago	45-5432 45 days
29369	vlad902 author:vlad902	feat(SimpleGraph): `IsSubwalk` of common Walk decompositions	Add some helper lemmas to show that decompositions of walks are sub-walks.	t-combinatorics merge-conflict	61/17	Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	7-4440 7 days ago	7-4441 7 days ago	62-42811 62 days
29937	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): `ringKrullDim` of quotient via supportDim	In this PR, we establish some lemma about `ringKrullDim` of quotient via lemmas of `supportDim`. Co-authored-by: Yongle Hu @mbkybky --- - [ ] depends on: #26219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	290/15	Mathlib.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Support.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-53646 3 days ago	3-53647 3 days ago	0-8336 2 hours
30441	linesthatinterlace author:linesthatinterlace	fix(Data/List/Sort): Deprecate and replace `List.Sorted`	Deprecates `Sorted` and defines new special-case predicates to be used for preorders. --- `List.Sorted` is essentially an irrelevant definition, as it is identical to List.Pairwise, and we have some results about Sorted which also always apply to Pairwise or do so under certain conditions (and vice versa). We also commonly use Sorted to talk specifically about `<` and `<=`, which can be somewhat unwieldy. This PR deprecates `Sorted` (so that there should now be no non-deprecated definitions under that namespace), and adds in `SortedLE`, `SortedLT`, `SortedGE` and `SortedGT`, which are defined analogously to `List.Nodup` for Preorders (List.Nodup is a good example of somewhere where using a special case of Pairwise works well). The vision is that API for these can be created together and for many purposes will suffice. `insertionSort` has now been moved to be independent of any of this, though theorems are provided showing that it does link to these predicates in a linear order. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	781/521	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/Data/Fin/Tuple/Sort.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Nat/BitIndices.lean,Mathlib/Data/Nat/Factors.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/Logic/Equiv/Finset.lean,Mathlib/Logic/Equiv/Multiset.lean,Mathlib/NumberTheory/ADEInequality.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/Synonym.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/Tactic/Simproc/Factors.lean,Mathlib/Topology/Category/Profinite/Nobeling/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling/Span.lean	25	56	['github-actions', 'joelriou', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	2-30228 2 days ago	2-30229 2 days ago	26-41807 26 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	t-algebra t-analysis t-number-theory merge-conflict 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	1-61469 1 day ago	1-61469 1 day ago	127-58875 127 days
30281	j-loreaux author:j-loreaux	chore(Analysis/{NormedSpace,Normed/Module}): migrate all remaining files	closes #28698 --- - [ ] depends on: #29447 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis merge-conflict	36/36	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Span.lean,Mathlib/Analysis/Calculus/DifferentialForm/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/CompCLM.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/ConvergenceOnBall.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Convex/AmpleSet.lean,Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Alternating/Curry.lean,Mathlib/Analysis/Normed/Module/Alternating/Uncurry/Fin.lean,Mathlib/Analysis/Normed/Module/Connected.lean,Mathlib/Analysis/Normed/Module/ENormedSpace.lean,Mathlib/Analysis/Normed/Module/Extr.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Curry.lean,Mathlib/Analysis/Normed/Module/MultipliableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/Normalize.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/RieszLemma.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/CompleteCodomain.lean,Mathlib/Analysis/SpecialFunctions/Integrability/LogMeromorphic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean	30	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-55316 1 day ago	1-55317 1 day ago	3-41416 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.	t-data merge-conflict	35/0	Mathlib/Data/List/Scan.lean	1	11	['ShreckYe', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	pechersky assignee:pechersky	1-17700 1 day ago	4-15431 4 days ago	74-62841 74 days
27936	alreadydone author:alreadydone	feat(Algebra): additivize Dvd and Prime	`Prime` can't be directly additivized, so we introduce `Preprime`, which drops the `≠ 0` condition, and additivize it to `AddPrime`. To show that `Preprime` 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 preprime iff one component is a unit and the other is preprime, and the same with `Preprime` 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 merge-conflict label:t-algebra$	400/191	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/ToAdditive/GuessName.lean	30	13	['JovanGerb', 'adomani', 'alreadydone', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	1-15423 1 day ago	1-15424 1 day ago	98-49698 98 days
28546	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): basic setup of Zd, full shift, cylinders, pat…	# Symbolic dynamics on groups: core API and entropy along finite shapes 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).	new-contributor t-dynamics merge-conflict	752/0	Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	120	['Sfgangloff', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	1-15422 1 day ago	1-15423 1 day ago	70-47424 70 days
26484	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): basics of diffeological spaces	Introduces diffeological spaces, smooth maps between them, the D-topology and the standard diffeology on finite-dimensional normed spaces. --- This PR continues the work from #21969.	t-differential-geometry merge-conflict	471/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib	3	11	['JovanGerb', 'github-actions', 'grunweg', 'lecopivo', 'mathlib4-merge-conflict-bot', 'peabrainiac']	grunweg assignee:grunweg	0-74003 20 hours ago	0-74004 20 hours ago	138-31722 138 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
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/)	new-contributor t-category-theory awaiting-author	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	20	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	nobody	465-57150 1 year ago	470-50815 1 year ago	1-48443 1 day
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	455-74526 1 year ago	455-74526 1 year ago	6-38745 6 days
11090	pangelinos author:pangelinos	feat: define spectral spaces and prove that a quasi-compact open of a spectral space is spectral	Define spectral spaces and prove that a quasi-compact open of a spectral space is spectral. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology please-adopt good first issue	69/0	Topology/Spectral/basic.lean	1	15	['YaelDillies', 'adomani', 'j-loreaux', 'jcommelin', 'kim-em', 'pangelinos']	nobody	451-58778 1 year ago	455-71704 1 year ago	16-44803 16 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/)	new-contributor t-category-theory awaiting-author	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	438-34270 1 year ago	469-79929 1 year ago	7-3203 7 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/)	new-contributor t-combinatorics WIP	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	11	['awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	387-53272 1 year ago	387-53272 1 year ago	31-44440 31 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	297-77807 9 months ago	297-77807 9 months ago	69-35596 69 days
20797	vbeffara author:vbeffara	feat(Topology/Covering): CM version of eq_of_comp_eq	Add equivalents of the lemmas `IsCoveringMap.eq_of_comp_eq` and `IsCoveringMap.const_of_comp_CM` for the case of bundled `ContinuousMap` parameters. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology easy awaiting-author	9/1	Mathlib/Topology/Covering.lean	1	4	['github-actions', 'ocfnash', 'vbeffara']	nobody	297-64572 9 months ago	298-65525 9 months ago	2-77310 2 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 t-meta modifies-tactic-syntax awaiting-author help-wanted	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	10	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard']	joneugster assignee:joneugster	267-30335 8 months ago	272-11931 8 months ago	0-16 16 seconds
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	267-29414 8 months ago	267-29414 8 months ago	13-33168 13 days
22302	CharredLee author:CharredLee	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/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	261-30610 8 months ago	261-31737 8 months ago	0-1528 25 minutes
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/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	241-78157 7 months ago	241-78157 7 months ago	20-81771 20 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/)	large-import new-contributor t-algebra awaiting-CI label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	11	['YaelDillies', 'github-actions']	nobody	220-7083 7 months ago	220-7083 7 months ago	51-9403 51 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/)	new-contributor t-algebra t-category-theory WIP 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	194-84554 6 months ago	194-84554 6 months ago	0-0 0 seconds
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/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	192-30873 6 months ago	192-30882 6 months 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/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	192-30184 6 months ago	192-30819 6 months ago	75-77754 75 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/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	188-75548 6 months ago	188-75548 6 months ago	72-3718 72 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 new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	186-76412 6 months ago	186-76412 6 months ago	27-52316 27 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/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	180-46558 5 months ago	180-46576 5 months ago	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/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	162-83044 5 months ago	192-30783 6 months ago	48-67492 48 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/)	t-data new-contributor awaiting-author	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	35	['MrSumato', 'github-actions', 'grunweg', 'plp127']	grunweg assignee:grunweg	160-64821 5 months ago	160-64821 5 months ago	29-59355 29 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/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	159-40435 5 months ago	159-40436 5 months ago	34-10595 34 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.	new-contributor t-analysis awaiting-author	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	12	['Paul-Lez', 'github-actions', 'grunweg', 'mhk119']	nobody	156-24940 5 months ago	217-66636 7 months ago	30-77130 30 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.	new-contributor t-number-theory awaiting-author	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	2	['github-actions', 'kckennylau']	literandltx assignee:literandltx	136-78297 4 months ago	137-20983 4 months ago	17-63153 17 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic)	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/)	t-data new-contributor awaiting-author	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	5	['Ruben-VandeVelde', 'github-actions']	nobody	135-66672 4 months ago	135-78964 4 months ago	13-85893 13 days
27069	FrankieNC author:FrankieNC	feat(Analysis/MetricSpace/HausdorffDimension): prove dimH of intervals and segments is 1	Add theorems `dimH_Icc01` and `dimH_segment` showing that the Hausdorff dimension of the unit interval [0,1] and of any non-degenerate real segment is 1. The key idea is that the segment is the image of [0,1] under a bi-Lipschitz map. We explicitly construct this map and prove it is both Lipschitz and antilipschitz, allowing us to transfer the dimension result from the unit interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	63/0	Mathlib/Topology/MetricSpace/HausdorffDimension.lean	1	10	['AntoineChambert-Loir', 'FrankieNC', 'github-actions', 'grunweg']	nobody	123-38722 4 months ago	123-51206 4 months ago	0-13398 3 hours
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.	new-contributor t-algebra awaiting-author label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	2	['Ruben-VandeVelde', 'github-actions']	nobody	110-40818 3 months ago	110-40818 3 months ago	25-6199 25 days
27297	hugh-fox author:hugh-fox	feat: add an equality between sums and products of cartesian products	Adds `prod_mul_eq_prod_product` and a version for Finsets `prod_range_mul_eq_prod_product` with to show an equality between `Fin (i * j)` and `Fin a × Fin b`. It is likely `prod_range_mul_eq_prod_product` belongs in a different file, in which case only the first commit should be considered. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/BigOperators/Fin.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'hugh-fox', 'j-loreaux', 'kckennylau']	nobody	106-41342 3 months ago	110-33330 3 months ago	7-6727 7 days
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	21	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	105-51144 3 months ago	105-51176 3 months ago	26-39463 26 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/)	new-contributor t-category-theory awaiting-author	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	12	['YunkaiZhang233', 'b-mehta', 'github-actions', 'robin-carlier']	nobody	104-58545 3 months ago	105-54426 3 months ago	0-3448 57 minutes
26483	metakunt author:metakunt	feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow	Adds equivalence of r-th primitive roots by a coprime e.	t-ring-theory new-contributor awaiting-author	79/0	Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	1	13	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'metakunt']	nobody	100-77246 3 months ago	100-77246 3 months ago	28-81831 28 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.	new-contributor t-measure-probability	13/0	Mathlib/MeasureTheory/PiSystem.lean	1	13	['EtienneC30', 'KiringYJ', 'github-actions', 'ocfnash']	RemyDegenne assignee:RemyDegenne	98-21700 3 months ago	105-57749 3 months ago	132-45580 132 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/)	new-contributor t-differential-geometry awaiting-author	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	13	['fyqing', 'github-actions', 'grunweg', 'tb65536']	grunweg assignee:grunweg	94-68272 3 months ago	104-29088 3 months ago	0-6418 1 hour
27226	xcloudyunx author:xcloudyunx	feat(Combinatorics/SimpleGraph): Add Subgraph.inclusion_edge_apply_coe and inclusion_edgeSet_apply_coe	This PR continues the work from #25248. Original PR: https://github.com/leanprover-community/mathlib4/pull/25248	new-contributor t-combinatorics awaiting-author	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	3	['b-mehta', 'github-actions', 'xcloudyunx']	b-mehta assignee:b-mehta	94-9659 3 months ago	94-23739 3 months ago	25-83942 25 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/)	will-close-soon new-contributor t-analysis awaiting-author WIP help-wanted	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	92-72183 3 months ago	92-72386 3 months ago	4-24257 4 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.	new-contributor t-combinatorics	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	1	['github-actions']	awainverse assignee:awainverse	86-21715 2 months ago	97-40184 3 months ago	97-40217 97 days
28186	Sebi-Kumar author:Sebi-Kumar	feat(Topology/Homotopy/Path): Add IsEquiv instance for Path.Homotopic	Add `instance : IsEquiv (Path x₀ x₁) Homotopic` to the library. Allow use of lemmas like `of_eq` when proving two paths are homotopic. --- To provide additional context, I am relatively new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at the University of Western Ontario and supervised by Chris Kapulkin and Daniel Carranza. My goal is to prove that the `n`-sphere is simply connected for `n > 1`. Also, I am not super familiar with `IsEquiv` and when it should/shouldn't be used. I just wanted to use a lemma like `Path.Homotopic.of_eq` at one point while working on my code, and thought this was the best way to add such a result to the library. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	5/0	Mathlib/Topology/Homotopy/Path.lean	1	4	['Sebi-Kumar', 'github-actions', 'kckennylau']	PatrickMassot assignee:PatrickMassot	86-21712 2 months ago	95-53042 3 months ago	95-53078 95 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/)	t-data new-contributor awaiting-author	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	82-54491 2 months ago	106-32388 3 months ago	0-533 8 minutes
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/)	new-contributor t-combinatorics awaiting-author	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	41	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	80-82550 2 months ago	80-82550 2 months ago	123-22718 123 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/)	new-contributor t-combinatorics awaiting-author	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	9	['Pjotr5', 'github-actions', 'grunweg']	nobody	79-85518 2 months ago	82-53727 2 months ago	39-17587 39 days
27242	hugh-fox author:hugh-fox	feat: add Gauss-like formula for sums of digit sums	Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor awaiting-author	113/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	5	['github-actions', 'hugh-fox', 'kckennylau']	nobody	79-60487 2 months ago	79-60487 2 months ago	39-41606 39 days
27261	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add definition for subpaths	Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	146/0	Mathlib.lean,Mathlib/Topology/Subpath.lean	2	24	['ADedecker', 'FrankieNC', 'Sebi-Kumar', 'github-actions', 'themathqueen', 'wwylele']	ADedecker assignee:ADedecker	78-61927 2 months ago	84-30418 2 months ago	34-15767 34 days
26156	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	358/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean	2	32	['EtienneC30', 'github-actions', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	74-60954 2 months ago	105-54074 3 months ago	42-9361 42 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/)	new-contributor t-combinatorics	375/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	52	['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	69-74165 2 months ago	69-74165 2 months ago	75-60343 75 days
26881	emo916math author:emo916math	feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)`	Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	50/2	Mathlib/Analysis/Calculus/Deriv/Star.lean	1	15	['emo916math', 'github-actions', 'j-loreaux', 'kckennylau']	j-loreaux assignee:j-loreaux	66-55790 2 months ago	97-55344 3 months ago	31-70593 31 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	66-25859 2 months ago	66-56962 2 months ago	73-43225 73 days
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	new-contributor t-algebra label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	1	['github-actions']	nobody	65-83638 2 months ago	66-76414 2 months ago	66-76448 66 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	13	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'sgouezel']	sgouezel assignee:sgouezel	65-40614 2 months ago	65-81049 2 months ago	27-76128 27 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/)	new-contributor t-measure-probability awaiting-author	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	63-56483 2 months ago	154-64316 5 months ago	0-11893 3 hours
28175	dsfxcimk author:dsfxcimk	feat: exterior angle theorem	Add Exterior angle theorem --- The Exterior Angle Theorem states that the exterior angle of a triangle equals the sum of the two non-adjacent interior angles. I plan to place this in Mathlib.Geometry.Euclidean.Triangle [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry awaiting-author	10/0	Mathlib/Geometry/Euclidean/Triangle.lean,docs/1000.yaml	2	16	['FrankieNC', 'JovanGerb', 'dsfxcimk', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	51-51570 1 month ago	65-64437 2 months ago	28-57160 28 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.	new-contributor t-analysis awaiting-author	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	50-59961 1 month ago	61-62064 2 months ago	1-5255 1 day
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/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	50-51362 1 month ago	81-41599 2 months ago	81-41628 81 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/)	new-contributor t-dynamics	401/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean	2	13	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	42-75618 1 month ago	80-8061 2 months ago	86-63924 86 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 [ ] depends on: #30141 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	83/1	Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean	2	1	['github-actions']	nobody	42-32092 1 month ago	42-32094 1 month ago	42-32131 42 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 new-contributor awaiting-author	196/0	Archive.lean,Archive/Imo/Imo1975Q3.lean	2	36	['Antidite', 'LLaurance', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	40-40751 1 month ago	40-40751 1 month ago	46-38383 46 days
26985	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define implicitFunOfProdDomain	This PR continues the work from #16743. Original PR: https://github.com/leanprover-community/mathlib4/pull/16743 --- - [x] depends on: #28352 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	107/4	Mathlib/Analysis/Calculus/Implicit.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	38-21713 1 month ago	45-82201 1 month ago	45-83775 45 days
29361	FlAmmmmING author:FlAmmmmING	feat: Catalan generating function as a formal power series	We introduce the Catalan generating function as a formal power series over `ℕ`. ## Main Definitions * `PowerSeries.catalanSeries`: The Catalan generating function as a power series. ## Main Results * `PowerSeries.sum_coeff_X_catalanSeries`: When `n` is a natural number, each term in the sum `coeff i X * catalan (n - i)` is 0 except for `i = 1`. * `PowerSeries.coeff_X_mul_catalanSeries`: The coefficient of `X * catalanSeries` at `X^n` is `catalan (n - 1)` when `n > 0`. * `PowerSeries.catalanSeries_one_add_X_mul_self_sq`: The Catalan generating function satisfies the equation `catalanSeries = 1 + X * catalanSeries ^ 2`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	71/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	kbuzzard assignee:kbuzzard	36-84710 1 month ago	69-80785 2 months ago	69-80811 69 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/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	35-21711 1 month ago	57-70711 1 month ago	57-70752 57 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/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	awainverse assignee:awainverse	34-21721 1 month ago	50-51644 1 month ago	50-51679 50 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated awaiting-author label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	9	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	31-80453 1 month ago	31-80453 1 month ago	6-29891 6 days
30333	paulorauber author:paulorauber	feat(Probability): definition of trajMeasure	A definition of `trajMeasure` and some basic lemmas. In the context of the Ionescu-Tulcea theorem, `trajMeasure μ₀ κ` corresponds to the distribution of the trajectory obtained by starting with the distribution `μ₀` and then iterating the kernels `κ`. Lemmas `partialTraj_compProd_kernel_eq_traj_map` and `traj_map_eq_kernel` are attributable to @EtienneC30 and some definitions borrow code from @RemyDegenne , who also improved the code considerably. Please let me know if you would like to be co-authors in this pull request. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	78/1	Mathlib/Probability/Kernel/IonescuTulcea/Traj.lean	1	11	['EtienneC30', 'RemyDegenne', 'github-actions']	EtienneC30 assignee:EtienneC30	29-50326 29 days ago	30-56511 30 days ago	5-85924 5 days
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/)	t-group-theory new-contributor awaiting-author	6/0	Mathlib/GroupTheory/GroupAction/CardCommute.lean	1	17	['github-actions', 'kckennylau', 'plp127', 'tb65536']	tb65536 assignee:tb65536	24-60306 24 days ago	24-60306 24 days ago	8-8414 8 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	pechersky assignee:pechersky	24-21700 24 days ago	50-43156 1 month ago	68-39349 68 days
30344	Deep0Thinking author:Deep0Thinking	feat(MeasureTheory/Integral): add versions of `exists_eq_interval_average` and first mean value theorem for integrals	Add the First mean value theorem for (unordered) interval integrals on ℝ. - `exists_eq_const_mul_interval_integral_of_continuous_on_of_ae_nonneg` - `exists_eq_const_mul_interval_integral_of_continuous_on_of_nonneg` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	290/41	Mathlib.lean,Mathlib/MeasureTheory/Integral/IntervalAverage.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean	3	9	['Deep0Thinking', 'github-actions', 'plp127']	RemyDegenne assignee:RemyDegenne	24-17641 24 days ago	36-39066 1 month ago	36-39095 36 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/)	new-contributor t-category-theory awaiting-author	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	16	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	23-58679 23 days ago	23-58679 23 days ago	62-83085 62 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/)	new-contributor t-combinatorics awaiting-author	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	6	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	23-23838 23 days ago	23-23838 23 days ago	148-3717 148 days
30746	jeremypparker author:jeremypparker	feat(Data/EReal): toReal_pos	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor easy	4/0	Mathlib/Data/EReal/Basic.lean	1	2	['github-actions', 'jeremypparker']	nobody	22-66944 22 days ago	23-74945 23 days ago	23-74982 23 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 new-contributor awaiting-author	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	8	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'zhuyizheng']	dwrensha assignee:dwrensha	22-59648 22 days ago	23-24352 23 days ago	65-5080 65 days
26129	LessnessRandomness author:LessnessRandomness	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles	This PR continues the work from #24206. Original PR: https://github.com/leanprover-community/mathlib4/pull/24206	new-contributor t-euclidean-geometry	202/15	Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean	8	85	['JovanGerb', 'LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'themathqueen']	jsm28 assignee:jsm28	21-64439 21 days ago	24-50688 24 days ago	145-33260 145 days
30821	chriseth author:chriseth	fix(Computability/Tape): introduce write-simplification theorem that uses `ListBlank.mk`	Add a simplification theorem which is a version of `Tape.write_mk'` that solves a simplification dead-end: If we have an expression of the form `(Tape.mk' L (ListBlank.cons a (ListBlank.mk R))).write b`, the theorem `Tape.write_mk'` would be applicable, but lean instead uses `ListBlank.cons_mk`, which turns it into `(Tape.mk' L (ListBlank.mk (a :: R))).write b` and makes `Tape.write_mk` no longer applicable because it requires `ListBlank.cons a R`, reaching a dead-end. This PR adds an equivalent theorem whose LHS allows `ListBlank.mk (a :: R)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	7/0	Mathlib/Computability/Tape.lean	1	1	['github-actions']	nobody	21-58469 21 days ago	21-58478 21 days ago	21-58517 21 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	21-47270 21 days ago	21-47349 21 days ago	21-47394 21 days
29437	SnirBroshi author:SnirBroshi	feat(Data/Seq): add Seq.subsequence and prove basic theorems about it	I added `Seq.subsequence` to compose a sequence with a monotone function, creating a subsequence. Aliased to `Seq.comp` since it's a composition. I also added `Nat.le_induction_step_iff` which is needed to prove a subsequence is a sequence. This proves the comment at the top of `Defs.lean` that says "if `f n = none`, then `f m = none` for all `m ≥ n`" while `IsSeq` only talks about `n+1`. For completion I added the same statement for `Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	104/0	Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Seq/Defs.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	pechersky assignee:pechersky	21-21717 21 days ago	57-68920 1 month ago	66-56405 66 days
26986	WangYiran01 author:WangYiran01	feat(Partition): add bijection for partitions with max part ≤ r	## Summary 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. ## Implementation notes - The proof uses `Multiset.erase` and `Multiset.cons` with basic properties of `sum`, `sup`, and `Partition` structures. - The bijection is implemented explicitly via `f` and `g`, and proven mutually inverse via `Subtype.ext`. ## Linting - [x] Passes `lake build` - [x] Linter clean (no commandStart or longLine issues) ## Author Contributed by Yiran Wang.	new-contributor t-combinatorics awaiting-author	26/0	Mathlib/Combinatorics/Enumerative/Partition.lean	1	6	['WangYiran01', 'github-actions', 'kckennylau', 'kim-em']	b-mehta assignee:b-mehta	18-78534 18 days ago	23-25249 23 days ago	102-52887 102 days
30121	idontgetoutmuch author:idontgetoutmuch	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/)	new-contributor t-differential-geometry awaiting-author	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	5	['github-actions', 'grunweg']	hrmacbeth assignee:hrmacbeth	17-55765 17 days ago	17-55765 17 days ago	25-22983 25 days
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra. --- - [x] depends on: #30806	new-contributor	223/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	7	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	TwoFX assignee:TwoFX	17-10624 17 days ago	17-13895 17 days ago	44-82270 44 days
30667	FrederickPu author:FrederickPu	Subgroup mul	Title: Algebra: pointwise products for subgroups Description: showed the point-wise product of disjoint subgroups is equivalent to their Cartesian product --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	47/0	Mathlib/Algebra/Group/Subgroup/Pointwise.lean	1	10	['FrederickPu', 'eric-wieser', 'github-actions', 'plp127', 'tb65536']	nobody	16-60268 16 days ago	25-50302 25 days ago	0-46291 12 hours
31102	JOSHCLUNE author:JOSHCLUNE	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/)	new-contributor	61/4	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/Hammer.lean,lake-manifest.json,lakefile.lean	5	1	['github-actions']	nobody	14-35160 14 days ago	14-42068 14 days ago	14-42051 14 days
30525	515801431 author:515801431	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.	new-contributor t-combinatorics	109/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	2	['IvanRenison', 'github-actions']	awainverse assignee:awainverse	13-21691 13 days ago	31-15705 1 month ago	31-15739 31 days
31178	morrison-daniel author:morrison-daniel	feat(LinearAlgebra/Multilinear): basis for multilinear maps	Adds a basis for MulilinearMap given bases for the domain and codomain. This PR builds upon work started in #25141 toward #11155. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra label:t-algebra$	567/10	Mathlib.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/Finsupp.lean,Mathlib/LinearAlgebra/Multilinear/Pi.lean	10	n/a	['github-actions']	nobody	11-31557 11 days ago	unknown	unknown
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for 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/)	new-contributor t-combinatorics awaiting-author	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	3	['github-actions', 'grunweg']	nobody	10-77101 10 days ago	82-53074 2 months ago	12-41939 12 days
28198	Sebi-Kumar author:Sebi-Kumar	feat(Analysis/InnerProductSpace/PiL2): Add instances for EuclideanSpace rank and EuclideanSpace being infinite	Add an instance for `Fact (Module.finrank 𝕜 (EuclideanSpace 𝕜 (Fin n)) = n)` which is needed to apply [stereographic'](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/Instances/Sphere.html#stereographic') to EuclideanSpace. Also add an instance for `Infinite (EuclideanSpace 𝕜 ι)` where `ι` is a nonempty fintype. I wasn't sure if these should go in separate pull requests, but they seemed similar enough to me. Thank you to Kenny Lau for the suggestions at [#mathlib4 > Instances for EuclideanSpace](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Instances.20for.20EuclideanSpace). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so 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. My goal is to contribute that the `n`-sphere is simply connected for `n > 1`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	6/0	Mathlib/Analysis/InnerProductSpace/PiL2.lean	1	7	['Ruben-VandeVelde', 'Sebi-Kumar', 'github-actions', 'kckennylau']	urkud assignee:urkud	10-76166 10 days ago	10-76166 10 days ago	82-22614 82 days
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	94/0	Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean	2	3	['github-actions', 'riccardobrasca', 'zach1502']	nobody	10-70960 10 days ago	10-70960 10 days ago	42-32522 42 days
30609	FlAmmmmING author:FlAmmmmING	feat(Combinatorics/Enumerative/Catalan): large and small Schröder numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	129/1	Mathlib/Combinatorics/Enumerative/Catalan.lean	1	5	['FlAmmmmING', 'SnirBroshi', 'YaelDillies', 'github-actions', 'plp127']	nobody	10-69011 10 days ago	10-82100 10 days ago	17-66663 17 days
30881	FlAmmmmING author:FlAmmmmING	feat(RingTheory/PowerSeries/Schroder.lean) : Define the generating function for large and small Schroder number	Define the generating function for large and small Schroder number. Main result : Prove some lemmas and the generating function of large Schroder. Todo : Prove the generating function of small Schroder. - depends on: #30609 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	350/1	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/RingTheory/PowerSeries/Schroder.lean	3	1	['github-actions']	dwrensha assignee:dwrensha	10-68346 10 days ago	19-69972 19 days ago	19-69958 19 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/)	new-contributor t-analysis awaiting-author WIP	468/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	3	20	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	10-52705 10 days ago	33-34310 1 month ago	50-22679 50 days
31107	rudynicolop author:rudynicolop	feat(Data/Multiset): add Multiset filter and bind lemmas	Add basic lemmas equating `Multiset` `filter`, `filterMap`, `join`, and `bind` operations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	67/2	Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean	2	7	['Ruben-VandeVelde', 'github-actions', 'rudynicolop']	nobody	10-20409 10 days ago	14-31106 14 days ago	14-31142 14 days
30391	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	This PR continues the work from #24395. Original PR: https://github.com/leanprover-community/mathlib4/pull/24395	t-data new-contributor	154/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	7	['BoltonBailey', 'github-actions', 'rudynicolop']	nobody	10-19897 10 days ago	35-28278 1 month ago	35-28312 35 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/)	new-contributor t-combinatorics awaiting-author	9/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	3	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	10-4090 10 days ago	10-4090 10 days ago	31-69826 31 days
27245	rirarika author:rirarika	feat: multivariate polynomial ring properties about irreducibility	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	88/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean	2	5	['alreadydone', 'github-actions', 'mbkybky']	alreadydone assignee:alreadydone	9-60481 9 days ago	9-60481 9 days ago	109-22535 109 days
27229	WilliamCoram author:WilliamCoram	feat(GroupTheory/DoubleCoset): multiple lemmas	From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory FLT new-contributor	88/0	Mathlib/GroupTheory/DoubleCoset.lean	1	31	['Ruben-VandeVelde', 'WilliamCoram', 'github-actions', 'kim-em', 'mariainesdff', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	9-58989 9 days ago	10-49933 10 days ago	103-2071 103 days
29758	SnirBroshi author:SnirBroshi	feat(RingTheory/RootsOfUnity): exp(pi * i * q) is a root of unity for rational q	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	33/4	Mathlib/RingTheory/RootsOfUnity/Complex.lean	1	7	['Ruben-VandeVelde', 'SnirBroshi', 'chrisflav', 'github-actions', 'kckennylau']	chrisflav assignee:chrisflav	9-38897 9 days ago	9-38910 9 days ago	55-44770 55 days
31243	FlAmmmmING author:FlAmmmmING	feat(Mathlib/Combinatorics/SimpleGraph/Planar.lean): Define the planar graph in mathlib	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean	2	5	['SnirBroshi', 'github-actions']	nobody	9-37486 9 days ago	10-12675 10 days ago	10-12710 10 days
30637	strihanje01 author:strihanje01	feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions	add Lindstrom's theorem and its strengthening for equal intersections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	210/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Lindstrom.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	9-21694 9 days ago	27-48962 27 days ago	27-49004 27 days
31011	YuvalFilmus author:YuvalFilmus	feat: properties of Chebyshev polynomials over the reals	Added several properties of the Chebyshev polynomials: - Degrees of T_n, U_n - Leading coefficients of T_n, U_n - Evaluations ofT_n, U_n at the endpoints ±1 - T_n is bounded on [-1, 1], and vice versa - Zeroes of T_n and U_n, and extrema of T_n - Normalized T_n minimizes the maximum absolute value over [-1, 1] for monic polynomials --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	989/5	Mathlib.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/RingTheory/Polynomial/Chebyshev.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Basic.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Monic.lean	7	22	['Ruben-VandeVelde', 'YuvalFilmus', 'github-actions', 'plp127']	Vierkantor assignee:Vierkantor	9-21677 9 days ago	16-55372 16 days ago	16-55399 16 days
26039	tsuki8 author:tsuki8	feat(RingTheory/MvPolynomial/{MonomialOrder,Ideal}): leadingTerm	define the leadingTerm and prove some lemmas related to the def `leadingTerm`: the leading term of `f` for the monomial ordering `m` some basic lemmas about leadingTerm including: 1. `leadingTerm_eq_zero_iff` 2. `leadingTerm_image_sdiff_singleton_zero` 3. `leadingTerm_image_insert_zero` 4. `leadingTerm_zero` 5. `leadingTerm_degree_eq` 6. `leadingTerm_degree_eq'` some lemmas about the degree of `f - m.leadingTerm f`: 1. `degree_sub_leadingTerm` 2. `degree_sub_leadingTerm_lt_degree` 3. `degree_sub_leadingTerm_lt_iff` also some lemmas about leading terms and ideals： 1. `span_leadingTerm_sdiff_singleton_zero` 2. `span_leadingTerm_insert_zero` 3. `span_leadingTerm_eq_span_monomial` 4. `span_leadingTerm_eq_span_monomial'` Co-authored-by: Junyu Guo @Hagb --- - [x] depends on: #24361 - [x] depends on: #26148 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import new-contributor	142/1	Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	2	38	['Hagb', 'chrisflav', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	9-14658 9 days ago	9-14658 9 days ago	26-64663 26 days
30214	SnirBroshi author:SnirBroshi	feat(Data/List/Basic): add `Fin` variants of `*mem_iff_getElem`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	8/0	Mathlib/Data/List/Basic.lean	1	5	['SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	8-37887 8 days ago	8-37906 8 days ago	40-27052 40 days
31038	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA acceptsFrom definitions and lemmas	This PR defines `NFA.acceptsFrom`, similar to [`DFA.acceptsFrom`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Computability/DFA.html#DFA.acceptsFrom), and provides helper lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	108/6	Mathlib/Computability/NFA.lean	1	23	['eric-wieser', 'github-actions', 'rudynicolop']	nobody	8-24379 8 days ago	16-23892 16 days ago	16-23939 16 days
30416	SnirBroshi author:SnirBroshi	feat(Logic/Relation): lemmas relating `Relation.Map` and `Function.onFun`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	32/0	Mathlib/Logic/Relation.lean	1	1	['github-actions']	awainverse assignee:awainverse	7-59797 7 days ago	34-40497 1 month ago	34-42722 34 days
30041	josephmckinsey author:josephmckinsey	feat(Algebra/Order/Floor): generalize mul_floor_div theorems to rings and semirings	Generalize `mul_cast_floor_div_cancel` from `Field` and `Semifield` to `Ring` and `Semiring`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	43/31	Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Analysis/Real/OfDigits.lean	4	11	['Ruben-VandeVelde', 'github-actions', 'josephmckinsey', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	7-53349 7 days ago	7-53371 7 days ago	33-46635 33 days
31263	LiranShaul author:LiranShaul	feat: arbitrary product of injective modules is injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra awaiting-author label:t-algebra$	14/0	Mathlib/Algebra/Module/Injective.lean	1	10	['erdOne', 'github-actions', 'joelriou', 'kbuzzard']	nobody	7-38778 7 days ago	9-35133 9 days ago	0-21724 6 hours
30962	WangYiran01 author:WangYiran01	feat(Combinatorics/Enumerative): add lattice path lemmas and counts	This PR adds definitions and theorems about monotone lattice paths: - Defines `pathCount`, `pathCountFrom`, `SubdiagProp`, and related structures. - Proves closed forms such as `pathCount_eq_closed`. - Adds Dyck/ballot subdiagonal property (`SubdiagProp`). All code builds successfully with `lake build`.	new-contributor t-combinatorics	64/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/RecLatticePath.lean	2	1	['github-actions']	awainverse assignee:awainverse	7-21703 7 days ago	17-84204 17 days ago	17-84242 17 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/)	new-contributor t-algebra label:t-algebra$	19/0	Mathlib/Algebra/Group/ForwardDiff.lean	1	9	['FlAmmmmING', 'Ruben-VandeVelde', 'github-actions']	dagurtomas assignee:dagurtomas	7-21697 7 days ago	14-58930 14 days ago	14-58972 14 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/)	t-data new-contributor merge-conflict	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	451-59435 1 year ago	456-75677 1 year ago	54-52408 54 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.	t-data new-contributor merge-conflict please-adopt 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', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp']	YaelDillies assignee:YaelDillies	379-35274 1 year ago	406-4065 1 year ago	12-48560 12 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/)	new-contributor t-order t-algebra merge-conflict 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	373-5840 1 year ago	373-5840 1 year 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/)	new-contributor t-logic merge-conflict awaiting-author	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	370-48361 1 year ago	370-48361 1 year 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)	new-contributor t-logic merge-conflict awaiting-author	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	366-793 1 year ago	unknown	unknown
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/)	new-contributor t-algebra merge-conflict 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	336-23210 11 months ago	342-58633 11 months ago	0-4534 1 hour
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/)	new-contributor t-topology merge-conflict awaiting-author	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	302-45222 9 months ago	302-45222 9 months 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	new-contributor t-combinatorics merge-conflict awaiting-author	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	301-64308 9 months ago	301-64308 9 months 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/)	t-computability new-contributor merge-conflict awaiting-author	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	301-30227 9 months ago	301-30227 9 months ago	33-11262 33 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/)	new-contributor t-algebra merge-conflict awaiting-author 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	296-51886 9 months ago	296-51887 9 months ago	36-2255 36 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/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	289-69234 9 months ago	289-69234 9 months ago	27-43617 27 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/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	288-43667 9 months ago	288-43667 9 months ago	9-73631 9 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/)	t-computability new-contributor merge-conflict awaiting-author	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	272-60643 8 months ago	272-60643 8 months ago	37-29014 37 days
21269	CharredLee author:CharredLee	(WIP) feat (CategoryTheory/Topos): Add topos theory content	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/)	new-contributor t-category-theory merge-conflict awaiting-author WIP	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	['CharredLee', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	262-26915 8 months ago	262-26915 8 months ago	0-13879 3 hours
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) ```	new-contributor t-algebra t-category-theory merge-conflict label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	19	['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	258-69241 8 months ago	258-69241 8 months ago	125-12755 125 days
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/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	257-53552 8 months ago	257-53552 8 months ago	15-40648 15 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/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	253-55255 8 months ago	253-55255 8 months 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/)	new-contributor t-analysis merge-conflict awaiting-author	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	245-51081 8 months ago	245-51081 8 months 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 new-contributor merge-conflict awaiting-author enhancement	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	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	227-80 7 months ago	unknown	unknown
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	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	221-81469 7 months ago	221-81469 7 months ago	51-85104 51 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	221-31024 7 months ago	221-31024 7 months ago	30-8337 30 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/)	new-contributor t-category-theory merge-conflict	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	218-63657 7 months ago	218-63658 7 months ago	58-20339 58 days
20873	vbeffara author:vbeffara	feat(Topology/Covering): path lifting and homotopy lifting	This proves the existence and uniqueness of path and homotopy lifts through covering maps. --- I tried to separate as much of the proof as possible into separate PRs (which are already in Mathlib now), but the proof here relies on a monolithic construction of an explicit lift along a well-chosen subdivision, in `partial_lift`, with associated definitions. Only one standalone lean file added. An older WIP PR #10084 by Junyan Xu @alreadydone proves similar results using a very similar construction for path lifting, with a different argument to obtain continuity for homotopy lifting. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology merge-conflict awaiting-author	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	217-66385 7 months ago	217-66385 7 months ago	55-53553 55 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/)	new-contributor t-analysis merge-conflict	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	210-37583 6 months ago	210-37583 6 months ago	25-60481 25 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/)	new-contributor t-algebra merge-conflict awaiting-author 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	210-33715 6 months ago	210-33715 6 months ago	13-60072 13 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/)	large-import new-contributor t-topology merge-conflict	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	170-48753 5 months ago	170-48755 5 months 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/)	new-contributor t-algebra merge-conflict please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	160-20706 5 months ago	160-20708 5 months ago	9-22007 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/)	new-contributor t-meta merge-conflict awaiting-author	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	153-13259 5 months ago	272-77621 8 months ago	27-65384 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/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	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	132-10020 4 months ago	132-10021 4 months ago	6-51040 6 days
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	132-10016 4 months ago	132-10016 4 months ago	11-84822 11 days
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/)	new-contributor t-category-theory merge-conflict awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	128-17832 4 months ago	128-17833 4 months ago	8-28043 8 days
10541	Louddy author:Louddy	feat(Algebra/SkewMonoidAlgebra/Basic): add SkewMonoidAlgebra	# Skew Monoid algebras This file presents a skewed version of `Mathlib.Algebra.MonoidAlgebra.Basic`. ## Definition We define `SkewMonoidAlgebra k G := G →₀ k` attached with a skewed convolution product. Here, the product of two elements `f g : SkewMonoidAlgebra k G` is the finitely supported function whose value at `a` is the sum of `f x * (x • g y)` over all pairs `x, y` such that `x * y = a`. This will be used in a later PR to define skew polynomial rings. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #15878 - [x] depends on: #19084 - [x] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict WIP label:t-algebra$	1624/0	Mathlib.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	4	105	['AntoineChambert-Loir', 'Louddy', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mattrobball']	AntoineChambert-Loir assignee:AntoineChambert-Loir	127-65498 4 months ago	127-65500 4 months ago	179-12934 179 days
20029	FrederickPu author:FrederickPu	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/)	new-contributor t-meta merge-conflict WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	111-37445 3 months ago	111-37446 3 months ago	0-34081 9 hours
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/)	t-algebraic-topology new-contributor merge-conflict WIP	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	105-68604 3 months ago	105-68604 3 months ago	1-20125 1 day
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 new-contributor t-category-theory merge-conflict WIP	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	105-68560 3 months ago	105-68560 3 months ago	7-63215 7 days
9935	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add constructors for horns	Added a function that given a simplicial set S and a set of n-1 simplexes satisfying certain conditions, creates a morphism in SSet from a n horn to a simplicial set S. Included also are a series of lemmas and definitions used in this construction. In particular I define a function that takes a m-simplex in a horn, and returns the smallest 'index' of face it factors through, and give a series of lemmas related to this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	105-67961 3 months ago	105-67961 3 months ago	14-58814 14 days
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	t-set-theory new-contributor merge-conflict	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	101-74781 3 months ago	101-74781 3 months ago	29-51653 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/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74751 3 months ago	101-74751 3 months 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/)	t-ring-theory new-contributor merge-conflict	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	100-76772 3 months ago	100-76772 3 months ago	20-16585 20 days
20671	thefundamentaltheor3m author:thefundamentaltheor3m	feat(Analysis/Asymptotics/SpecificAsymptotics): Proving that 𝛔ₖ(n) = O(nᵏ⁺¹)	This PR proves a result about the $\sigma_k(n)$ arithmetic function, namely, that it is $O\left(n^{k+1}\right)$. Main theorem: `theorem sigma_asymptotic (k : ℕ) : (fun n ↦ (σ k n : ℝ)) =O[atTop] (fun n ↦ (n ^ (k + 1) : ℝ))` This result was proved as part of the sphere packing project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-number-theory 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	95-80313 3 months ago	95-80313 3 months ago	9-59130 9 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	92-62103 3 months ago	132-10010 4 months ago	29-56208 29 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. ---	new-contributor t-meta merge-conflict please-adopt modifies-tactic-syntax good first issue	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	90-77571 2 months ago	91-927 2 months ago	22-16933 22 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/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	83-27178 2 months ago	83-27179 2 months 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/)	new-contributor merge-conflict	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	83-6498 2 months ago	105-68820 3 months 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/)	new-contributor merge-conflict	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	82-54730 2 months ago	105-68821 3 months ago	7-62439 7 days
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	78-45442 2 months ago	78-45442 2 months ago	0-78027 21 hours
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 ---	new-contributor t-logic merge-conflict	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	65-60761 2 months ago	65-60762 2 months ago	21-3001 21 days
29574	JarodUW author:JarodUW	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/)	t-ring-theory new-contributor merge-conflict	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	60-12710 1 month ago	60-12711 1 month ago	3-7974 3 days
29092	zhuyizheng author:zhuyizheng	feat(MeasureTheory): add absolutely continuous functions, FTC and integration by parts	Add the ε-δ definition of absolutely continuous functions on a closed interval in ℝ. Prove Fundamental Theorem of Calculus and integration by parts for absolutely continuous functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	1376/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsContFunc.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	7	6	['Ruben-VandeVelde', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	46-32860 1 month ago	46-32861 1 month ago	0-24361 6 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/)	new-contributor t-category-theory merge-conflict awaiting-author	17/0	Mathlib/CategoryTheory/Limits/Shapes/Products.lean	1	6	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier']	nobody	45-75005 1 month ago	132-7711 4 months ago	0-47665 13 hours
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/)	new-contributor t-measure-probability merge-conflict awaiting-author	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	34-50056 1 month ago	36-62526 1 month ago	1-21124 1 day
22657	Xmask19 author:Xmask19	feat: a graph is maximally acyclic iff it is a tree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	33-30244 1 month ago	33-30245 1 month ago	208-19611 208 days
28126	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): relate equality in fundamental groupoid to homotopy	Prove the theorem `fromPath_eq_iff_homotopic` which shows that two paths are equal in the fundamental groupoid if and only if they are homotopic. Also add simp lemmas `fromPath_refl`, `fromPath_symm`, and `fromPath_trans`. Together, these allow one to prove two paths are homotopic by transferring to the fundamental groupoid and using the `aesop_cat` tactic. --- I would like to thank Kenny Lau for inspiring this code on Zulip at [#Is there code for X? > Using aesop_cat to prove paths are homotopic](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Using.20aesop_cat.20to.20prove.20paths.20are.20homotopic). Also, I would like to note that I am a newcomer when it comes to contributing to Mathlib, and that this code was written as a part of a formalization project at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza (which is happening through the Fields Undergraduate Summer Research Program). - [ ] depends on: #28234 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	121/141	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Product.lean	8	11	['Sebi-Kumar', 'alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	mattrobball assignee:mattrobball	26-44388 26 days ago	26-44389 26 days ago	14-30316 14 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/)	large-import new-contributor t-number-theory 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	16-79709 16 days ago	16-79709 16 days ago	53-41880 53 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/)	file-removed new-contributor t-topology merge-conflict awaiting-author	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	16-71439 16 days ago	16-71440 16 days ago	0-2409 40 minutes
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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	10-12565 10 days ago	178-52515 5 months ago	39-67601 39 days
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	new-contributor awaiting-CI t-meta merge-conflict awaiting-author	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	7-50758 7 days ago	7-50759 7 days ago	2-71043 2 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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	0-23482 6 hours ago	178-53440 5 months ago	45-84611 45 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/)	new-contributor t-algebra merge-conflict blocked-by-other-PR 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	415-45329 1 year ago	415-45329 1 year ago	0-0 0 seconds
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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41307 1 year ago	407-41307 1 year ago	0-1045 17 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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41307 1 year ago	407-41308 1 year ago	0-1299 21 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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41306 1 year ago	407-41306 1 year ago	0-613 10 minutes
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict awaiting-author blocked-by-other-PR	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	389-63964 1 year ago	389-63964 1 year ago	6-8380 6 days
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	318-62041 10 months ago	363-77669 11 months ago	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	new-contributor t-combinatorics merge-conflict blocked-by-other-PR	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', 'leanprover-community-mathlib4-bot']	YaelDillies assignee:YaelDillies	301-64308 9 months ago	301-64308 9 months ago	0-1791 29 minutes
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/)	large-import new-contributor t-topology merge-conflict awaiting-author blocked-by-other-PR	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	277-26544 9 months ago	277-26544 9 months ago	39-21495 39 days
14060	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Clubs): define club sets and prove basic properties	Create a file where club sets are defined and their basic properties are proven. I also created a new recursion principle for ordinals, bounded recursion. --- - [ ] depends on: #19189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	315/3	Mathlib.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Club.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	93	['YaelDillies', 'YnirPaz', 'alreadydone', 'dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'zeramorphic']	nobody	255-11665 8 months ago	255-11665 8 months ago	92-44198 92 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/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	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	192-30833 6 months ago	192-30838 6 months ago	0-179 2 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/)	new-contributor t-measure-probability blocked-by-other-PR	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	1	['github-actions']	nobody	131-78030 4 months ago	131-78586 4 months ago	15-66224 15 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/)	new-contributor t-measure-probability blocked-by-other-PR	680/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	131-78030 4 months ago	131-78559 4 months ago	15-65390 15 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 - [ ] depends on: #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	432/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	131-78029 4 months ago	131-78638 4 months ago	15-68781 15 days
10006	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): homotopy in quasicategories	Defined a homotopy between two 1-simplicies in a quasicategories, and proved the property of being homotopic forms an equivalence relation. --- - [ ] depends on: #9935 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author blocked-by-other-PR	898/1	Mathlib.lean,Mathlib/AlgebraicTopology/Homotopy.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	4	3	['joelriou', 'leanprover-community-mathlib4-bot']	nobody	105-68221 3 months ago	105-68221 3 months ago	0-0 0 seconds
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74785 3 months ago	101-74785 3 months ago	0-2067 34 minutes
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	t-set-theory new-contributor merge-conflict blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74776 3 months ago	101-74776 3 months ago	0-1523 25 minutes
28208	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add the definition `foldTrans` to concatenate finite sequences of paths	Add `foldTrans`, which folds the function `Path.trans` across a sequence of paths with compatible endpoints, corresponding to the concatenation of a finite sequence of paths. This is implemented with `Fin.dfoldl` from the Batteries library. Prove basic properties about `foldTrans` (i.e., how it behaves with respect to `Path.refl`, `Path.subpath`, and homotopies). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so 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. My goal is to prove that the `n`-sphere is simply connected for `n > 1`, following the proof from Hatcher's "Algebraic Topology." - [ ] depends on: #27261 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	259/0	Mathlib.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Subpath.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	95-24562 3 months ago	95-24563 3 months ago	0-2340 39 minutes
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	new-contributor t-combinatorics blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	89-30366 2 months ago	89-36943 2 months ago	0-591 9 minutes
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	new-contributor t-logic merge-conflict awaiting-author blocked-by-other-PR	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	87-5409 2 months ago	87-5410 2 months 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/)	new-contributor t-algebra merge-conflict blocked-by-other-PR 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	84-41917 2 months ago	84-41918 2 months ago	43-26015 43 days
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	83-6535 2 months ago	83-6535 2 months ago	0-1808 30 minutes
26413	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	13	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	74-38320 2 months ago	74-38321 2 months ago	0-5139 1 hour
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	- Show that the quotient of a groupoid is a groupoid in `CategoryTheory.Quotient`. - Define the free groupoid on a category in `CategoryTheory.Category.FreeGroupoid` and hence define the free-forgetful adjunction between `Grpd` and `Cat`. - 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] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	246/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-70927 1 month ago	45-70935 1 month ago	0-340 5 minutes
28718	imbrem author:imbrem	Added 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	new-contributor t-category-theory awaiting-author blocked-by-other-PR	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	8	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	41-81533 1 month ago	41-81534 1 month ago	0-24930 6 hours
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/)	new-contributor merge-conflict blocked-by-other-PR	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	34-55271 1 month ago	57-71684 1 month ago	0-396 6 minutes
28152	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology): characterize simply connectedness in terms of loops	Show that a space is simply connected if and only if all loops within that space are homotopic to the constant loop. To be used in a proof that the `n`-sphere is simply connected for `n > 1`. --- This code was written at the University of Western Ontario as a part of the Fields Undergraduate Summer Research Program under the supervision of Chris Kapulkin and Daniel Carranza. - [ ] depends on: #28126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict blocked-by-other-PR	37/5	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-44387 26 days ago	26-44387 26 days ago	0-2854 47 minutes
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 SetTheory 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. - [ ] depends on: #28208 - [ ] depends on: #28198 - [ ] depends on: #28185 - [ ] depends on: #28152 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict blocked-by-other-PR	639/6	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/Subpath.lean	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-44385 26 days ago	26-44386 26 days ago	0-23 23 seconds
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/)	new-contributor merge-conflict blocked-by-other-PR	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	16-71437 16 days ago	16-71438 16 days ago	0-340 5 minutes
29309	LLaurance author:LLaurance	feat(Combinatorics): any connected graph contains a vertex that leaves the graph preconnected if removed	This shows that any nontrivial connected graph contains a vertex that, when removed, leaves the graph connected. --- - [x] depends on: #30590 - [ ] depends on: #31103 - [x] depends on: #31116 - [ ] depends on : #31118 - [ ] depends on : #31119 - [ ] depends on : #31120 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics awaiting-author blocked-by-other-PR	182/2	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	56	['LLaurance', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	12-74793 12 days ago	12-79981 12 days ago	32-22015 32 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/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	492-62815 1 year ago	492-62838 1 year ago	0-0 0 seconds
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	318-62041 10 months ago	363-77669 11 months ago	0-0 0 seconds

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
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/)	t-analysis awaiting-author	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	30	['chenyili0818', 'github-actions', 'jcommelin', 'sgouezel', 'winstonyin']	nobody	1	470-82135 1 year ago	632-63300 1 year ago	51-80670 51 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/)	t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	14	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	1	451-82619 1 year ago	451-82621 1 year ago	18-13508 18 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	1	297-77807 9 months ago	297-77807 9 months ago	69-35596 69 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/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	1	241-78157 7 months ago	241-78157 7 months ago	20-81771 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/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	1	188-50868 6 months ago	188-50868 6 months ago	46-55730 46 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/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	1	177-84785 5 months ago	177-84785 5 months ago	54-54882 54 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/)	t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	59	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	1	143-59684 4 months ago	295-52872 9 months ago	295-52846 295 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/)	t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	25	['PierreQuinton', 'YaelDillies', 'github-actions', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	1	97-71877 3 months ago	109-55174 3 months ago	109-55196 109 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/)	t-data awaiting-author	44/22	Mathlib/Data/Int/GCD.lean	1	5	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	1	85-82157 2 months ago	138-24854 4 months ago	58-34020 58 days
26078	kckennylau author:kckennylau	feat(AlgebraicGeometry): add x, y, px, py for points on elliptic curves	--- Split from #25218. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	dagurtomas assignee:dagurtomas	1	84-56872 2 months ago	84-56872 2 months ago	64-11252 64 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/)	t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	19	['alexkeizer', 'eric-wieser', 'github-actions', 'quangvdao']	eric-wieser assignee:eric-wieser	1	78-55072 2 months ago	128-22779 4 months ago	128-22811 128 days
26310	kckennylau author:kckennylau	Binary form	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/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	1	70-62918 2 months ago	86-52589 2 months ago	57-1104 57 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	1	66-25859 2 months ago	66-56962 2 months ago	73-43225 73 days
26614	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): add more API for `take`/`drop`	These came up while proving the Girth-Diameter inequality. The main lemma proves that taking `n` vertices of a walk results in a sub-walk of taking `k` vertices when `n` is less than or equal to `k`. The sub-walk relation is represented as `p.support.Sublist q.support` where `p` and `q` are walks. - [ ] depends on: #26655 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	74/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	18	['Rida-Hamadani', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1	65-29492 2 months ago	65-29524 2 months ago	4-83551 4 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/)	t-logic awaiting-author	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	1	57-76198 1 month ago	83-76983 2 months ago	17-70200 17 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/)	t-order awaiting-author	8/2	Mathlib/Order/SuccPred/Basic.lean	1	3	['YaelDillies', 'github-actions', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	1	55-33813 1 month ago	55-33813 1 month ago	44-13238 44 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/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	1	50-51362 1 month ago	81-41599 2 months ago	81-41628 81 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	t-ring-theory awaiting-author	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	46	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'ocfnash']	chrisflav assignee:chrisflav	1	50-35524 1 month ago	51-76939 1 month ago	82-34290 82 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	t-data awaiting-author	360/0	MathlibTest/Junk.lean	1	17	['NotWearingPants', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	2	45-17039 1 month ago	45-17039 1 month ago	96-70055 96 days
24789	Ruben-VandeVelde author:Ruben-VandeVelde	chore: move Algebra.Group.Hom.End to Algebra.Ring	This moves us towards the goal of not depending on `Ring` under `Algebra.Group`; this is mentioned in https://github.com/leanprover-community/mathlib4/issues/11757 and on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/near/512348574). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra awaiting-author label:t-algebra$	4/10	Mathlib.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/Ring/Hom/End.lean	5	9	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	43-74367 1 month ago	43-74367 1 month ago	14-7845 14 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated awaiting-author label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	9	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	31-80453 1 month ago	31-80453 1 month ago	6-29891 6 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/)	t-data awaiting-author	19/0	Mathlib/Data/Fintype/Quotient.lean	1	12	['github-actions', 'kckennylau', 'pechersky', 'tristan-f-r', 'vihdzp']	pechersky assignee:pechersky	2	29-7799 29 days ago	29-7799 29 days ago	88-10285 88 days
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		159/104	Mathlib/Data/Fin/Tuple/Basic.lean	1	7	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	1	27-52112 27 days ago	45-48953 1 month ago	47-18454 47 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	pechersky assignee:pechersky	2	24-21700 24 days ago	50-43156 1 month ago	68-39349 68 days
30526	SnirBroshi author:SnirBroshi	chore(Logic/Relation): use `Subrelation` to state theorems	chore(Logic/Relation): replace every `∀ x y, r x y → r' x y` with `Subrelation r r'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	79/73	Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/Interval/Finset/Basic.lean	7	4	['SnirBroshi', 'github-actions', 'thorimur', 'vihdzp']	thorimur assignee:thorimur	1	22-22221 22 days ago	22-22254 22 days ago	8-76821 8 days
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	29	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	1	21-75164 21 days ago	21-75164 21 days ago	140-77895 140 days
30378	mans0954 author:mans0954	refactor(Order/Hom/Lattice): Use default `initialize_simps_projections` configuration for `LatticeHom`.	Use default `initialize_simps_projections` configuration for `LatticeHom`. I'm not sure what was originally intended by the TODO, but this appears to work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	4/7	Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Hom/WithTopBot.lean	2	3	['bryangingechen', 'fpvandoorn', 'github-actions']	bryangingechen assignee:bryangingechen	1	16-66696 16 days ago	17-40560 17 days ago	18-11603 18 days
29946	smmercuri author:smmercuri	feat(InfinitePlace/Ramification): embeddings of unramified/ramified infinite places satisfy `IsUnmixed/IsMixed`	--- - [x] depends on: #29945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-number-theory	67/2	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri', 'xroblot']	alexjbest assignee:alexjbest	1	15-40952 15 days ago	15-41280 15 days ago	45-68071 45 days
31107	rudynicolop author:rudynicolop	feat(Data/Multiset): add Multiset filter and bind lemmas	Add basic lemmas equating `Multiset` `filter`, `filterMap`, `join`, and `bind` operations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	67/2	Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean	2	7	['Ruben-VandeVelde', 'github-actions', 'rudynicolop']	nobody	1	10-20409 10 days ago	14-31106 14 days ago	14-31142 14 days
26544	vihdzp author:vihdzp	feat(SetTheory/ZFC/Ordinal): Lean ordinals to ZFC ordinals	We define `Ordinal.toZFSet` and prove that its outputs are precisely the ZFC ordinals. Moved from #19985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-set-theory delegated	166/5	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean	4	26	['alreadydone', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	1	10-2034 10 days ago	10-2034 10 days ago	84-52000 84 days
27308	xyzw12345 author:xyzw12345	feat(LinearAlgebra/SymmetricAlgebra): IsSymmetricAlgebra	This PR continues the work from #24602. Original PR: https://github.com/leanprover-community/mathlib4/pull/24602	t-algebra label:t-algebra$	107/1	Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean	2	13	['github-actions', 'kckennylau', 'mattrobball', 'xyzw12345']	mattrobball assignee:mattrobball	1	9-69261 9 days ago	9-72891 9 days ago	116-8130 116 days
31287	YaelDillies author:YaelDillies	refactor(SetTheory/ZFC): deduplicate coercion to sets	Currently, we have both `ZFSet.toSet` and `SetLike.coe` to turn a `ZFSet` into a `Set ZFSet`. This is bad for simp normal form. This PR removes the first spelling in favor of the second one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	111/104	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/Ordinal.lean	3	16	['YaelDillies', 'eric-wieser', 'github-actions', 'staroperator']	nobody	1	7-40484 7 days ago	8-58012 8 days ago	8-58049 8 days
30940	jessealama author:jessealama	feat(Data/Set/Image): add Option.range lemmas for elim function	This PR adds two new lemmas about `Option.elim` and `range`: - `Option.range_elim`: characterizes the range of a function defined via `Option.elim` - `Option.image_elim_range_some_eq_range`: the image of `range some` under `Option.elim b f` equals `range f` ## Context These lemmas are part of a larger PR (#30854) that touched multiple areas of Mathlib. Following reviewer suggestions, the PR has been split into smaller, focused contributions. This PR contains only the changes to `Mathlib/Data/Set/Image.lean`. ## Potential Reviewers Based on recent contributions to `Mathlib/Data/Set/Image.lean`: - @euprunin - @plp127	t-data	12/0	Mathlib/Data/Set/Image.lean	1	5	['github-actions', 'jessealama', 'plp127']	nobody	1	6-65544 6 days ago	18-42053 18 days ago	18-42091 18 days
28719	mitchell-horner author:mitchell-horner	refactor: redefine `IsTuranMaximal`	Redefined `IsTuranMaximal := G.IsExtremal (CliqueFree · (r + 1))` and - replaced `classical` in `IsTuranMaximal.le_iff_eq` with `DecidableRel` - refactored `turanGraph.instDecidableRelAdj`, `turanGraph_zero`, `exists_isTuranMaximal` - added `open Fintype` - replaced `simp only` with `rw` or `simp_rw` --- - [x] depends on: #28721 - [x] depends on: #29054 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	33/46	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	12	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vihdzp']	kmill assignee:kmill	1	6-12429 6 days ago	46-81707 1 month ago	74-14425 74 days
30047	ooovi author:ooovi	feat(Combinatorics/SimpleGraph): edge labellings	Add edge labellings for `SimpleGraph` as well as some basic lemmata. --- This is mostly a cleaned up part of @b-mehta's lean4 port of their [formalisation of an exponentially better upper bound on Ramsey numbers ](https://github.com/b-mehta/ExponentialRamsey/). I need these definitions for another project on Ramsey theory. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-combinatorics awaiting-author	234/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/EdgeLabelling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean	5	52	['YaelDillies', 'b-mehta', 'github-actions', 'ooovi', 'vlad902']	b-mehta assignee:b-mehta	3	6-4257 6 days ago	9-83378 9 days ago	34-69915 34 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/)	t-data awaiting-author	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	30	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	1	5-70882 5 days ago	169-10989 5 months ago	73-73341 73 days
31431	harahu author:harahu	doc(Data): misc. improvements	This PR fixes a batch of typos in the `Data` subdirectory. Found and fixed with help from Codex. As part of this work, we also demote some headers that shouldn't have been H1. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	12/20	Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean	3	6	['github-actions', 'grunweg', 'harahu', 'metakunt']	nobody	1	4-46777 4 days ago	4-64737 4 days ago	4-64774 4 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/)	t-algebra 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	29	['github-actions', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot']	joelriou assignee:joelriou	1	4-31957 4 days ago	4-31957 4 days ago	17-42383 17 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 label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	7	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	mattrobball assignee:mattrobball	1	3-21700 3 days ago	10-55934 10 days ago	20-81916 20 days
25779	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformations): strong and lax natural transformations of lax functors	Given two lax functors `F G` between bicategories, we define lax natural transformations as families of 1-morphisms `∀ a : B, F.obj a ⟶ G.obj a` equipped with a naturality 2-cell `∀ {a b : B} (f : a ⟶ b), app a ≫ G.map f ⟶ F.map f ≫ app b` that are required to satisfy conditions such as naturality, and compatibility with the `mapId` and `mapComp` fields of the source and target functors. This notion dualizes the existing notion of oplax natural transformations between, and tries to narrow the current gap between lax and oplax functors in the library, where the latter has much more formalized API. For maintainability, The code tries to stay as aligned as possible with the code in `CategoryTheory.Bicategory.Naturaltransformations.Oplax`. --- I followed the book by Johnson and Yau for the definition. I made @yuma-mizuno and @callesonne authors of the files, as they are the authors of the original code for Oplax functors, which I basically copy-pasted and modified to make it work with lax functors. They should feel free to modify this if they want. Next thing on the list is to tackle modifications between lax/strong natural transforms of lax transforms, as well as the category instance on lax functors. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25565. Original PR: https://github.com/leanprover-community/mathlib4/pull/25565	t-category-theory	286/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,scripts/noshake.json	3	8	['github-actions', 'joelriou', 'robin-carlier', 'yuma-mizuno']	joelriou assignee:joelriou	1	2-75386 2 days ago	2-75386 2 days ago	119-59290 119 days
31227	YaelDillies author:YaelDillies	feat(Algebra/Homology): sandwich a comm group between two finite comm groups	From ClassFieldTheory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT maintainer-merge t-algebra label:t-algebra$	64/39	Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Data/Finite/Prod.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Finite.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean	6	10	['YaelDillies', 'erdOne', 'github-actions', 'jcommelin']	erdOne assignee:erdOne	1	2-49270 2 days ago	2-68471 2 days ago	10-44949 10 days
31388	b-mehta author:b-mehta	feat(Topology/Order): add unordered versions of topological Rolle's theorem	To support this, we also add lemmas about extending functions from unordered intervals, and take the liberty of using `variable` more in that file, and removing an `erw`. The motivation here is that this is useful infrastructure for an unordered/central version of Taylor's theorem, as discussed here: [#maths > Taylor's theorem @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem/near/402571017). As such, this PR also originates from the Exponential Ramsey project. The PR currently makes a couple of different changes, but the overall diff is relatively small, and helps to motivate some of the changes, so I elected to keep it one PR for now, unless other maintainers would prefer it to be split up or further explained.	tech debt t-analysis awaiting-author	107/24	Mathlib/Order/Interval/Set/UnorderedInterval.lean,Mathlib/Topology/Order/DenselyOrdered.lean,Mathlib/Topology/Order/ExtendFrom.lean,Mathlib/Topology/Order/LeftRight.lean,Mathlib/Topology/Order/Rolle.lean	5	n/a	['ADedecker', 'b-mehta', 'github-actions', 'j-loreaux', 'mcdoll', 'plp127']	nobody	1	2-46134 2 days ago	unknown	unknown
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.	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	19	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	1	2-29587 2 days ago	2-35529 2 days ago	54-23157 54 days
28766	yury-harmonic author:yury-harmonic	feat(Nat/Factorial): use binary splitting for `ascFactorial`/`descFactorial`	Mathlib has a `@[csimp]` lemma for `Nat.factorial`. This PR adds similar lemmas for `Nat.ascFactorial` and `Nat.descFactorial`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	49/25	Mathlib/Data/Nat/Factorial/Basic.lean	1	8	['github-actions', 'pechersky', 'plp127', 'yury-harmonic']	pechersky assignee:pechersky	1	2-28199 2 days ago	2-28199 2 days ago	65-53382 65 days
31387	gasparattila author:gasparattila	feat(Topology/Separation): condition for regularity given a subbasis	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	19/0	Mathlib/Topology/Separation/Regular.lean	1	1	['github-actions', 'plp127']	j-loreaux assignee:j-loreaux	1	2-21675 2 days ago	5-46754 5 days ago	5-46785 5 days
30950	jessealama author:jessealama	feat: add AffineEquiv.ofLinearEquiv	Adds a constructor for building affine equivalences from linear equivalences and base points. --- Extracted from #30854. cc @Vierkantor @YaelDillies	t-algebra delegated label:t-algebra$	42/0	Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean	1	25	['YaelDillies', 'github-actions', 'j-loreaux', 'jessealama', 'jsm28', 'mathlib-bors']	nobody	1	1-82312 1 day ago	2-34594 2 days ago	2-37505 2 days
30389	euprunin author:euprunin	fix: correctly apply `hint` priority (was always set to default 1000 due to a bug)	Fixes #29831. In addition to fixing the bug, this PR also adjusts the (now-working) tactic priorities to ensure that: * `bound` is tested _after_ `aesop` (`bound` calls `aesop` and is therefore stronger) * `group` is tested _after_ `ring` (`group` calls `ring` and is therefore stronger) A bug in the parsing code below caused the priority value to be ignored, resulting in all hints using the default priority of 1000 regardless of the `register_hint` priority parameter: ```lean elab (name := registerHintStx) "register_hint" p:("(" "priority" ":=" num ")")? tac:tactic : command => liftTermElabM do -- remove comments let prio := match p with \| some stx => match stx.raw[3]?.bind Syntax.isNatLit? with \| some n => n \| none => 1000 \| none => 1000 let tac : TSyntax `tactic := ⟨tac.raw.copyHeadTailInfoFrom .missing⟩ addHint prio tac ``` Fixed by simplifying the syntax to take a mandatory numeric priority argument and extracting it directly via `prio.raw.isNatLit?`, removing the index-based parsing and the silent fallback to 1000. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta bug	275/201	Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Finiteness.lean,Mathlib/Tactic/GCongr.lean,Mathlib/Tactic/Group.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith.lean,Mathlib/Tactic/NoncommRing.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/hint.lean,MathlibTest/hintAll.lean	17	19	['BoltonBailey', 'Vierkantor', 'euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	1	1-76510 1 day ago	6-50001 6 days ago	30-6407 30 days
24730	YaelDillies author:YaelDillies	feat(RingTheory): group-like elements	Define group-like elements in a bialgebra, ie elements such that `η a = 1` and `Δ a = a ⊗ₜ a`. We prove that group-like elements of a coalgebra over a domain are linearly independent, group-like elements of a bialgebra form a monoid, group-like elements of a Hopf algebra form a group. From Toric Co-authored-by: Michał Mrugała --- - [x] depends on: #24747 - [x] depends on: #31515 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	315/0	Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean,Mathlib/RingTheory/Coalgebra/GroupLike.lean,Mathlib/RingTheory/HopfAlgebra/GroupLike.lean	4	81	['Julian-Kuelshammer', 'Parcly-Taxel', 'Whysoserioushah', 'YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'kim-em', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'smorel394']	eric-wieser assignee:eric-wieser	2	1-72968 1 day ago	1-73157 1 day ago	182-48906 182 days
31537	RemyDegenne author:RemyDegenne	feat: totally bounded sets have finite covers	New result: a totally bounded set has finite `ε`-covers for all `ε > 0`. I then use it to golf and generalize `exists_finite_isCover_of_isCompact_closure` and `exists_finite_isCover_of_isCompact` to extended pseudo-metric spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	36/17	Mathlib/Data/Rel/Cover.lean,Mathlib/Topology/MetricSpace/Cover.lean	2	7	['YaelDillies', 'github-actions']	nobody	1	1-71856 1 day ago	1-71856 1 day ago	1-73558 1 day
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	394/0	Mathlib.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/NormNumI.lean,MathlibTest/norm_numI.lean	5	53	['JovanGerb', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'hrmacbeth']	robertylewis assignee:robertylewis	1	1-67155 1 day ago	119-45834 3 months ago	119-50138 119 days
31497	staroperator author:staroperator	feat(Algebra/Group): semigroup ideals	This PR defines semigroup ideals; they are different from (in fact, a weaker form of) ring ideals. We prove that in a monoid whose algebraic order is well-quasi-order, all semigroup ideals are finitely generated, and the semigroup ideals satisfy the ascending chain condition. These definitions and results are useful in #27414. Note: Following `Ideal` with `Submodule`, `SemigroupIdeal M` is an `abbrev` of `SubMulAction M M`. Also, `Ideal.closure` is a re-definition of `SubMulAction.closure` and `Ideal.FG` is defeq to `SubMulAction.FG` but unfolds more nicely. --- - [x] depends on: #31517 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra label:t-algebra$	194/0	Mathlib.lean,Mathlib/Algebra/Group/Ideal.lean,Mathlib/Algebra/Order/Group/Ideal.lean	3	24	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'staroperator']	nobody	1	1-38982 1 day ago	1-53437 1 day ago	2-74295 2 days
30989	kckennylau author:kckennylau	feat(RingTheory): Teichmuller map	Let `R` be an `I`-adically complete ring, and `p` be a prime number with `p ∈ I`. This PR constructs the Teichmüller map `Perfection (R ⧸ I) p →₀ R` such that it composed with the quotient map `R →+ R ⧸ I` is the "0-th coefficient" map `Perfection (R ⧸ I) p →+* R ⧸ I`. This generalises the existing [PreTilt.untilt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Perfectoid/Untilt.html#PreTilt.untilt). I have also moved `Mathlib/LinearAlgebra/SModEq` to a folder to be `/SModEq/Basic.lean`, because I needed to add some lemmas to `/SModEq/Prime.lean`; I also added a lemma to the end of `/Basic.lean` called `ideal`. --- In order to try to artificially minimise the diff count, I have made #30990 which only moves the file `SModEq`. - [x] depends on: #30990 - [x] depends on: #31193 - [x] depends on: #31195 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		206/112	Mathlib.lean,Mathlib/LinearAlgebra/SModEq/Basic.lean,Mathlib/LinearAlgebra/SModEq/Prime.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/Teichmuller.lean	6	24	['erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	1	1-33804 1 day ago	1-33822 1 day ago	11-10894 11 days
31007	kckennylau author:kckennylau	feat(RingTheory): generalise perfection to monoids	1. We generalise `PerfectRing` to monoids (without changing the name). 2. We move `Submonoid.perfection` and `Ring.Perfection` to the already existing `Perfection` namespace, which solves the problem that `Ring.Perfection` and its lemmas `Perfection.xxx` are in different namespaces. Also, the monoid perfection and right perfection have the same underlying set, so this unify the two approaches. 3. `Perfection.lift` is now generalised to monoids: `liftMonoidHom : (M →* N) ≃ (M →* Perfection N p)` where `M` is a perfect monoid. --- This is in preparation for a future PR following #30989. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		247/123	Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean	4	32	['github-actions', 'jjdishere', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	2	1-33419 1 day ago	1-33440 1 day ago	11-25233 11 days
31278	ADedecker author:ADedecker	feat: approximate continuous functions by smooth functions	This is motivated by #31079, and adapted from [this lemma](https://github.com/leanprover-community/sphere-eversion/blob/master/SphereEversion/ToMathlib/ExistsOfConvex.lean#L213) in the Sphere Eversion project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-analysis t-differential-geometry	157/0	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Const.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/SmoothApprox.lean	7	36	['ADedecker', 'github-actions', 'grunweg', 'mcdoll', 'sgouezel']	grunweg assignee:grunweg	1	1-31056 1 day ago	7-55644 7 days ago	8-44606 8 days
30650	JovanGerb author:JovanGerb	perf(reassoc, to_app, elementwise): don't pass the same proof to the kernel again	In `reassoc`, `to_app`, `elementwise`, the proof of the original lemma was being used to prove the modified lemma. This is silly, because the modified lemma can be proved using the original lemma directly. Hence, this PR modifies `addRelatedDecl` to include this optimization. Previously, `addRelatedDecl` would pass around both the type and the value of the original declaration. This was necessary, because the inferred type of the value might not be identical to the type it is given. Now this is not necessary anymore, because the type of the constant is exactly the type that it is given, so the type can always be obtained with `inferType`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	19/21	Mathlib/Tactic/CategoryTheory/Elementwise.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,Mathlib/Util/AddRelatedDecl.lean	4	13	['JovanGerb', 'dwrensha', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127']	dwrensha assignee:dwrensha	1	1-23351 1 day ago	1-64867 1 day ago	26-54166 26 days
31324	YaelDillies author:YaelDillies	chore(Finsupp): move `mapRange.equiv` earlier	Move `mapRange.equiv` to `Data.Finsupp.Defs` and `mapRange.addEquiv` to `Algebra.Group.Finsupp`. This lets us not import fields when defining `finsuppAntidiag`. As previously, I am basing myself off the idea that `Finsupp` will at some point in the future be generalised to other base points (rather than just `0` as it is now), and that therefore anything under `Data.Finsupp` should not be algebraic (apart from mentioning `0`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	103/151	Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean	6	1	['github-actions', 'wwylele']	ocfnash assignee:ocfnash	1	1-21688 1 day ago	7-67866 7 days ago	7-67856 7 days
23940	YaelDillies author:YaelDillies	feat: polytopes	From Toric Co-authored-by: Matthew Johnson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis awaiting-author	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	12	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'ooovi']	j-loreaux assignee:j-loreaux	1	0-75676 21 hours ago	0-75695 21 hours ago	143-64212 143 days
31544	RemyDegenne author:RemyDegenne	feat: add `MeasureTheory.Measure.integrable_comp_iff`	Necessary and sufficient condition for `Integrable f (κ ∘ₘ μ)`, integrability with respect to the composition of a kernel and a measure. Special case of `ProbabilityTheory.integrable_comp_iff`, which is about composition of two kernels. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	8/0	Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean	1	2	['EtienneC30', 'github-actions']	nobody	1	0-68424 19 hours ago	0-68424 18 hours ago	1-67821 1 day
31451	jsm28 author:jsm28	feat(Analysis/Convex/Combination): `centerMass_const`, `centerMass_congr`	Add the lemma: ```lean lemma Finset.centerMass_const (hw : ∑ j ∈ t, w j ≠ 0) (c : E) : t.centerMass w (Function.const _ c) = c := by ``` along with various congruence lemmas that help with applying this in cases where the points are constant for the nonzero weights in `t`, but not necessarily everywhere. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge t-analysis	28/0	Mathlib/Analysis/Convex/Combination.lean	1	4	['Ruben-VandeVelde', 'github-actions', 'j-loreaux', 'jsm28']	nobody	1	0-67831 18 hours ago	0-67831 18 hours ago	3-83397 3 days
31493	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): `incenter_mem_interior`	Add a direct statement that the incenter of a simplex lies in its interior (along with factoring out a lemma `excenterWeights_empty_pos` that turns out to be useful several times in its proof). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	21/2	Mathlib/Geometry/Euclidean/Incenter.lean	1	3	['Ruben-VandeVelde', 'github-actions']	nobody	1	0-66742 18 hours ago	0-67589 18 hours ago	3-17595 3 days
30071	Jlh18 author:Jlh18	feat: dualize Pseudofunctor.CoGrothendieck results to Pseudofunctor.Grothendieck	Continuing from #29681, dualize all definitions and lemmas in the namespace `Pseudofunctor.CoGrothendieck` to results in the namespace `Pseudofunctor.Grothendieck`. - [x] depends on: #29681 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	118/10	Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	1	16	['Jlh18', 'callesonne', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	riccardobrasca assignee:riccardobrasca	1	0-54191 15 hours ago	0-54191 15 hours ago	37-15865 37 days
30842	kim-em author:kim-em	feat: add Aristotle task for command palette	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	128/0	.vscode/tasks.json,scripts/README.md,scripts/aristotle/README.md	3	17	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'vikram-shanker']	robertylewis assignee:robertylewis	1	0-42653 11 hours ago	21-11050 21 days ago	21-11086 21 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-algebra t-topology t-number-theory label:t-algebra$	227/62	Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	71	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	1	0-39624 11 hours ago	2-36619 2 days ago	84-50396 84 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/)	t-meta	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	1	['JovanGerb', 'github-actions']	nobody	1	0-32928 9 hours ago	0-32928 9 hours ago	0-32908 9 hours
30913	eric-wieser author:eric-wieser	feat(Computability/Language): add subtraction notation	Defining `-` as set difference seems like a natural thing to do when `+` is set union. The fact that this definition satisfies `OrderedSub` seems to be a good signal that it is a good idea. --- - [x] depends on: #30912 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-computability	22/0	Mathlib/Computability/Language.lean	1	9	['YaelDillies', 'chenson2018', 'ctchou', 'eric-wieser', 'github-actions', 'jessealama', 'mathlib4-dependent-issues-bot']	nobody	1	0-31202 8 hours ago	7-64152 7 days ago	14-26182 14 days
31247	rudynicolop author:rudynicolop	feat(Computability/DFA): add DFA complement, union, and intersection	Add theorems for DFA complement, union, and intersection closure, and prove that regular languages are closed under complement, union, and intersection. Note there's a [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553522644) regarding PRs for regular languages (also tracked in #24205). Admittedly, this is yet another PR, and this may prove obsolete if other PRs are merged first. In particular, this PR competes with #20238 and #15651. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	124/5	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	34	['ctchou', 'github-actions', 'rudynicolop', 'staroperator']	nobody	1	0-26231 7 hours ago	9-80181 9 days ago	9-80215 9 days
31244	kim-em author:kim-em	chore: use generic `map_X` lemmas where possible	While thinking about grind annotations for homomorphisms, it occurs to me that automation is more likely when we use the generic, rather than namespaced, lemmas where possible. This is some cleanup in that direction.		817/861	Archive/Examples/Eisenstein.lean,Archive/Wiedijk100Theorems/Partition.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Subgroup.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Pointwise.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.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/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Action/End.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/TensorProduct.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Harmonic/Analytic.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/BoundedContinuousFunctionChar.lean	336	19	['github-actions', 'j-loreaux', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	tb65536 assignee:tb65536	1	0-23379 6 hours ago	0-23407 6 hours ago	8-32997 8 days
30793	LessnessRandomness author:LessnessRandomness	feat(Analysis/InnerProductSpace/Basic): add a simp lemma	Add a simp lemma (for benchmarking purposes - to see if it doesn't have a bad performance impact). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	46/36	Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Topology/VectorBundle/Riemannian.lean	19	30	['JovanGerb', 'LessnessRandomness', 'fpvandoorn', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	1	0-23348 6 hours ago	16-80692 16 days ago	1-61891 1 day
28026	kim-em author:kim-em	feat: grind annotations for `Disjoint`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	76/56	Archive/Imo/Imo2001Q3.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/SupIndep.lean,MathlibTest/grind/pairwise_disjoint.lean	11	33	['chrisflav', 'euprunin', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	1	0-4976 1 hour ago	0-4999 1 hour ago	48-60022 48 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	11	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	1	470-82138 1 year ago	484-5335 1 year ago	1-73101 1 day
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/)	t-algebra t-meta merge-conflict awaiting-author 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	470-82138 1 year ago	519-77202 1 year ago	5-72414 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/)	t-algebra t-topology merge-conflict awaiting-author 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	470-82135 1 year ago	652-3863 1 year ago	7-6153 7 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/)	t-algebra merge-conflict awaiting-author 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	470-82135 1 year ago	619-54450 1 year ago	5-6524 5 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	470-82134 1 year ago	492-62838 1 year ago	35-56459 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/)	slow-typeclass-synthesis t-order t-algebra merge-conflict 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	470-82133 1 year ago	529-39203 1 year ago	13-18399 13 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/)	t-meta merge-conflict WIP	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	1	470-82132 1 year ago	723-6918 1 year ago	45-49113 45 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/)	t-data new-contributor merge-conflict	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	451-59435 1 year ago	456-75677 1 year ago	54-52408 54 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/)	tech debt merge-conflict awaiting-author	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	451-48488 1 year ago	452-37635 1 year ago	7-18420 7 days
11800	JADekker author:JADekker	feat : Define 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/)	awaiting-zulip t-topology merge-conflict please-adopt	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	424-7906 1 year ago	424-29881 1 year ago	119-10687 119 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/)	t-topology merge-conflict awaiting-author	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	14	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll']	nobody	2	402-8870 1 year ago	402-8870 1 year ago	46-5572 46 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/)	t-order t-topology merge-conflict awaiting-author	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	363-81340 11 months ago	363-81340 11 months ago	63-69206 63 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/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	1	288-43667 9 months ago	288-43667 9 months ago	9-73631 9 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/)	t-meta merge-conflict awaiting-author	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	1	287-59827 9 months ago	722-33114 1 year ago	4-7271 4 days
17005	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Regular): define singular cardinals	Define singular cardinals and prove basic lemmas about them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	94/1	Mathlib.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Basic.lean	3	28	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	1	270-7599 8 months ago	346-781 11 months ago	34-18388 34 days
19189	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Arithmetic): order isomorphism between omega and the natural numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	44/0	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	21	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	1	238-14810 7 months ago	238-14810 7 months ago	47-37012 47 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 delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1	223-59671 7 months ago	223-59671 7 months ago	0-214 3 minutes
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	219-77738 7 months ago	220-10907 7 months ago	10-21608 10 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	217-76189 7 months ago	217-76191 7 months ago	4-16654 4 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	1	203-22933 6 months ago	214-51563 7 months ago	29-60989 29 days
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/)	t-data merge-conflict awaiting-author	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	191-32794 6 months ago	191-32794 6 months ago	43-81255 43 days
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	1	189-59908 6 months ago	443-73466 1 year ago	0-0 0 seconds
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	1	181-53693 5 months ago	181-53695 5 months ago	82-54712 82 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). --- - [ ] depends on: #24570 - [ ] 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/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	1	171-67023 5 months ago	171-67026 5 months ago	43-17409 43 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/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	1	132-11181 4 months ago	132-11181 4 months ago	91-73632 91 days
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	1	111-40764 3 months ago	111-40765 3 months ago	23-63406 23 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/)	t-meta merge-conflict	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	92-27256 3 months ago	92-27256 3 months ago	71-28549 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/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	1	83-27178 2 months ago	83-27179 2 months ago	13-49738 13 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/)	t-ring-theory merge-conflict WIP	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	1	78-57311 2 months ago	78-57312 2 months ago	14-30610 14 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/)	t-number-theory merge-conflict	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	48-59712 1 month ago	129-59649 4 months ago	79-1228 79 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/)	file-removed awaiting-zulip merge-conflict	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	29-2875 29 days ago	29-2876 29 days ago	0-1 1 second
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta merge-conflict delegated	118/3	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	18	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	1	21-81171 21 days ago	21-81172 21 days ago	15-14325 15 days
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	t-algebra merge-conflict awaiting-author 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	16-79757 16 days ago	16-79757 16 days ago	4-17723 4 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/)	t-algebra merge-conflict 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	13-63013 13 days ago	13-63014 13 days ago	28-12053 28 days
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta merge-conflict awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'Vierkantor', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	1	4-36600 4 days ago	unknown	unknown
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-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	222/34	Mathlib.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean	12	22	['erdOne', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'tb65536', 'xroblot']	jcommelin assignee:jcommelin	1	4-514 4 days ago	4-794 4 days ago	21-14802 21 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/)	t-computability merge-conflict blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	1	376-75292 1 year ago	376-75292 1 year ago	72-28392 72 days
29365	staroperator author:staroperator	feat(SetTheory/ZFC): add `ZFSet.card`	The same as `ZFSet.rank`, we define `ZFSet.card` as `ZFSet.{u} → Cardinal.{u}` and prove some basic properties. --- - [x] depends on: #30841 - [ ] depends on: #31287 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR	197/83	Mathlib.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Cardinal.lean	4	48	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	YaelDillies assignee:YaelDillies	1	8-54531 8 days ago	8-54532 8 days ago	48-85122 48 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`, also notated as `M1 * M2`, a direct construction without ε-transitions. - Theorem `concat_accepts : (M1 * M2).accepts = M1.accepts * M2.accepts`, showing the correctness of the construction. - Theorem `IsRegular.concat`, showing that regular languages are closed under concatenation. --- - [ ] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor blocked-by-other-PR	258/6	Mathlib/Computability/NFA.lean	1	22	['ctchou', 'github-actions', 'lambda-fairy', 'mathlib4-dependent-issues-bot', 'rudynicolop']	nobody	1	1-29139 1 day ago	16-21233 16 days ago	4-2407 4 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
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/)	t-category-theory awaiting-author	252/0	Mathlib.lean,Mathlib/CategoryTheory/Dialectica/Closed.lean	2	3	['github-actions', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	470-82140 1 year ago	486-50144 1 year ago	12-17890 12 days
12952	adomani author:adomani	test: length statistics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	test-ci WIP	124/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/mathlib_stats.sh	3	9	['github-actions']	nobody	470-82139 1 year ago	499-54819 1 year ago	0-0 0 seconds
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	470-82138 1 year ago	492-62838 1 year ago	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/)	test-ci WIP	366/0	.github/workflows/mathlib_stats.yml,.github/workflows/ml_stats_label.yaml,scripts/count_decls.lean,scripts/mathlib_stats.sh	4	n/a	['github-actions']	nobody	470-82138 1 year ago	unknown	unknown
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/)	WIP	152/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/SyntaxDataLinter.lean	3	0	[]	nobody	470-82137 1 year ago	499-54812 1 year ago	0-0 0 seconds
10099	mcdoll author:mcdoll	feat: Integration by parts for higher dimensional spaces	--- - [x] depends on: #9987 - [x] depends on: #10105 - [x] depends on: #10107 - [x] depends on: #10115 - [x] depends on: #10118 - [x] depends on: #10182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-analysis WIP	429/0	Mathlib/Analysis/InnerProductSpace/OrthoDecomp.lean,Mathlib/MeasureTheory/Integral/test2.lean	2	3	['alexjbest', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	470-82136 1 year ago	644-26153 1 year ago	0-0 0 seconds
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/)	t-logic awaiting-author	364/0	Mathlib.lean,Mathlib/Logic/Godel/PartArith.lean	2	3	['Ruben-VandeVelde', 'YaelDillies']	nobody	470-82136 1 year ago	525-53372 1 year ago	97-20483 97 days
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/)	t-algebra t-analysis awaiting-CI WIP label:t-algebra$	119/0	Mathlib/Analysis/Calculus/DualNumber.lean	1	4	['github-actions']	nobody	470-82135 1 year ago	676-70166 1 year ago	0-0 0 seconds
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/)	t-analysis awaiting-author	404/0	Mathlib.lean,Mathlib/Analysis/Calculus/Gradient/Lemmas.lean	2	30	['chenyili0818', 'github-actions', 'jcommelin', 'sgouezel', 'winstonyin']	nobody	470-82135 1 year ago	632-63300 1 year ago	51-80670 51 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/)	t-analysis awaiting-author	71/0	Mathlib/Analysis/Complex/AbsMax.lean	1	8	['dupuisf', 'j-loreaux']	nobody	470-82135 1 year ago	665-36981 1 year ago	12-86009 12 days
6859	MohanadAhmed author:MohanadAhmed	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/)	CI WIP help-wanted	114/0	.github/workflows/mk_windows_bundle.yml,scripts/windowsBundle.bat	2	0	[]	nobody	470-82134 1 year ago	807-25005 2 years ago	0-0 0 seconds
8224	Kha author:Kha	chore: add `lean4checker` benchmark		WIP	16/0	scripts/bench/temci-config.run.yml	1	3	['Kha', 'grunweg', 'kim-em', 'leanprover-bot']	nobody	470-82134 1 year ago	538-48663 1 year ago	0-0 0 seconds
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/)	t-meta	141/0	Mathlib.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Setm.lean,test/Setm.lean	4	3	['thorimur']	nobody	470-82134 1 year ago	751-83658 2 years ago	0-0 0 seconds
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/)	t-meta	205/0	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean	2	0	[]	nobody	470-82133 1 year ago	890-82487 2 years ago	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/)	t-meta awaiting-author	41/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Consume.lean,test/consume.lean	4	4	['alexjbest', 'digama0', 'kim-em', 'kmill']	nobody	470-82133 1 year ago	555-45627 1 year ago	51-33797 51 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/)	new-contributor t-category-theory awaiting-author	112/0	Mathlib.lean,Mathlib/CategoryTheory/Sites/CoveringFamilies.lean	2	20	['AnthonyBordg', 'adamtopaz', 'dagurtomas', 'github-actions', 'joelriou']	nobody	465-57150 1 year ago	470-50815 1 year 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/)		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	4	['joneugster', 'mergify']	nobody	456-76418 1 year ago	456-76472 1 year ago	0-0 0 seconds
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	5/0	Mathlib/Algebra/Group/Basic.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	455-74526 1 year ago	455-74526 1 year ago	6-38745 6 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/)	RFC t-meta WIP	24/0	Mathlib/Tactic/ComputeDegree.lean	1	0	[]	nobody	455-71674 1 year ago	455-71674 1 year ago	0-0 0 seconds
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/)	t-algebra RFC WIP label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/LinearProgramming.lean	2	14	['apurvanakade', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	455-71589 1 year ago	455-71589 1 year ago	0-0 0 seconds
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/)	t-algebra RFC WIP label:t-algebra$	87/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	63	['Shreyas4991', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em', 'madvorak']	nobody	455-71199 1 year ago	455-71199 1 year ago	66-6720 66 days
7219	Ruben-VandeVelde author:Ruben-VandeVelde	feat: Equivs for AddMonoidAlgebras	--- Extracted from #6718. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	113/0	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Equiv.lean	2	12	['Ruben-VandeVelde', 'alreadydone', 'eric-wieser']	eric-wieser assignee:eric-wieser	455-71161 1 year ago	455-71162 1 year ago	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/)	t-meta awaiting-author	5/0	.vscode/module-docstring.code-snippets	1	5	['erdOne', 'grunweg', 'robertylewis', 'trivial1711']	nobody	455-69988 1 year ago	455-69988 1 year ago	50-50444 50 days
10026	madvorak author:madvorak	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/)	t-algebra RFC WIP label:t-algebra$	86/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	9	['eric-wieser', 'madvorak', 'riccardobrasca']	nobody	454-49052 1 year ago	454-49052 1 year ago	0-0 0 seconds
10159	madvorak author:madvorak	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/)	t-algebra RFC WIP label:t-algebra$	83/0	Mathlib.lean,Mathlib/LinearAlgebra/LinearProgramming.lean	2	7	['eric-wieser', 'madvorak', 'riccardobrasca']	nobody	454-49038 1 year ago	454-49038 1 year ago	0-0 0 seconds
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/)	t-linter awaiting-author	77/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TerminalRefineLinter.lean	3	14	['adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	451-82619 1 year ago	451-82621 1 year ago	18-13508 18 days
11090	pangelinos author:pangelinos	feat: define spectral spaces and prove that a quasi-compact open of a spectral space is spectral	Define spectral spaces and prove that a quasi-compact open of a spectral space is spectral. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology please-adopt good first issue	69/0	Topology/Spectral/basic.lean	1	15	['YaelDillies', 'adomani', 'j-loreaux', 'jcommelin', 'kim-em', 'pangelinos']	nobody	451-58778 1 year ago	455-71704 1 year ago	16-44803 16 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/)	t-category-theory awaiting-author	74/0	Mathlib.lean,Mathlib/Data/Fiber.lean	2	17	['adri326', 'joelriou', 'sinhp']	nobody	449-61554 1 year ago	664-81021 1 year ago	1-32924 1 day
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/)	t-category-theory awaiting-author	185/0	Mathlib.lean,Mathlib/CategoryTheory/ConcreteCategory/Pointed.lean,Mathlib/CategoryTheory/Elements.lean	3	13	['dagurtomas', 'github-actions', 'kim-em']	nobody	448-69271 1 year ago	470-69927 1 year ago	7-80557 7 days
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/)	awaiting-author WIP	144/0	Mathlib/GameTheory/FairDivision/Discrete/Basic.lean	1	9	['Shreyas4991', 'eric-wieser', 'github-actions']	nobody	441-41320 1 year ago	441-41320 1 year ago	0-20853 5 hours
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/)	t-data new-contributor awaiting-author	90/0	Mathlib/Data/Nat/PartENat.lean	1	3	['erdOne', 'github-actions', 'urkud']	nobody	438-71325 1 year ago	438-71325 1 year ago	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/)	new-contributor t-category-theory awaiting-author	40/0	Mathlib/CategoryTheory/EpiMono.lean	1	3	['github-actions', 'joelriou', 'mattrobball']	nobody	438-34270 1 year ago	469-79929 1 year 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	437-51063 1 year ago	441-84572 1 year ago	1-43047 1 day
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/)	t-meta WIP	26/15	Mathlib/Tactic/CategoryTheory/BicategoryCoherence.lean,Mathlib/Tactic/CategoryTheory/Coherence.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	430-57929 1 year ago	431-16777 1 year ago	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-algebra t-topology awaiting-author label:t-algebra$	57/0	Mathlib/Topology/Algebra/ConstMulAction.lean	1	9	['ADedecker', 'adri326', 'j-loreaux', 'jcommelin']	ADedecker assignee:ADedecker	429-49921 1 year ago	581-62659 1 year ago	55-82183 55 days
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author WIP label:t-algebra$	120/0	Mathlib.lean,Mathlib/FieldTheory/SimpleExtension.lean	2	17	['Command-Master', 'acmepjz', 'github-actions', 'leanprover-community-mathlib4-bot', 'tb65536']	nobody	424-77371 1 year ago	424-77371 1 year ago	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/)	t-meta WIP	27/0	Mathlib/Tactic/Positivity/Core.lean	1	1	['YaelDillies']	nobody	389-81302 1 year ago	631-73371 1 year ago	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/)	new-contributor t-combinatorics WIP	24/0	Mathlib/Combinatorics/SimpleGraph/Map/Finite.lean	1	11	['awueth', 'github-actions', 'jcommelin', 'kim-em', 'urkud']	nobody	387-53272 1 year ago	387-53272 1 year ago	31-44440 31 days
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/)	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	8	['github-actions']	nobody	373-49831 1 year ago	373-49831 1 year ago	0-0 0 seconds
19329	adomani author:adomani	perf(CI): automatically benchmark PRs when they are opened	This action posts the comment ``` !bench This is an automated bench-marking that runs when a PR is opened. No need to repeat. ``` whenever a PR is opened. It then ignores any subsequent changes to the PR. The automatic benching should help in catching PRs that unknowingly introduce a high performance cost, as was the case for my PR #18033. ### Note. Running `!bench` strains the benchmarking system and it is not feasible to run it on every push. However, Sebastian, in private communication with Johan, approved of automatically benching every PR once, when it is opened. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI WIP	25/0	.github/workflows/first_bench_is_free.yml	1	12	['Ruben-VandeVelde', 'adomani', 'alreadydone', 'eric-wieser', 'github-actions', 'grunweg', 'jcommelin']	nobody	355-85325 11 months ago	357-74280 11 months ago	0-1356 22 minutes
19721	urkud author:urkud	feat (WIP): formalize Moreira's version of Sard's theorem	--- I'm in the process of migrating development to https://github.com/urkud/SardMoreira [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	427/1	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/Moreira2001.lean	5	1	['github-actions']	nobody	329-24005 10 months ago	334-20820 10 months ago	0-0 0 seconds
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/)	t-algebra awaiting-author label:t-algebra$	11/5	Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean	2	2	['eric-wieser', 'github-actions']	nobody	309-51358 10 months ago	309-51358 10 months ago	4-64422 4 days
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-analysis t-topology t-differential-geometry awaiting-author	150/0	Mathlib.lean,Mathlib/Geometry/Manifold/Algebra/SmoothGerm.lean	2	33	['YaelDillies', 'github-actions', 'grunweg', 'jcommelin', 'kim-em', 'mcdoll']	fpvandoorn assignee:fpvandoorn	309-39115 10 months ago	443-60480 1 year ago	144-63944 144 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/)	t-meta awaiting-author	101/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Widget/Explain.lean	3	8	['adamtopaz', 'eric-wieser', 'github-actions', 'joneugster', 'kmill']	nobody	306-55393 10 months ago	306-55393 10 months ago	49-80804 49 days
19323	madvorak author:madvorak	feat: Function to Sum decomposition	--- Discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Function.20to.20Sum.20decomposition	t-data WIP	50/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean	2	2	['github-actions', 'madvorak']	nobody	304-62055 10 months ago	314-64653 10 months ago	43-18005 43 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	78/0	Mathlib/Algebra/Group/Defs.lean	1	13	['github-actions', 'hannahfechtner', 'jcommelin', 'kbuzzard', 'kim-em', 'trivial1711']	nobody	297-77807 9 months ago	297-77807 9 months ago	69-35596 69 days
20797	vbeffara author:vbeffara	feat(Topology/Covering): CM version of eq_of_comp_eq	Add equivalents of the lemmas `IsCoveringMap.eq_of_comp_eq` and `IsCoveringMap.const_of_comp_CM` for the case of bundled `ContinuousMap` parameters. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology easy awaiting-author	9/1	Mathlib/Topology/Covering.lean	1	4	['github-actions', 'ocfnash', 'vbeffara']	nobody	297-64572 9 months ago	298-65525 9 months ago	2-77310 2 days
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/)	t-data awaiting-author	37/0	Mathlib/Data/Matrix/Invertible.lean	1	4	['eric-wieser', 'github-actions']	nobody	290-58075 9 months ago	290-58075 9 months ago	23-30991 23 days
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/)	t-logic awaiting-author	308/5	Mathlib/ModelTheory/Bundled.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/FinitelyGenerated.lean,Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	5	9	['GabinKolly', 'YaelDillies', 'github-actions', 'vihdzp']	nobody	287-34532 9 months ago	297-46986 9 months ago	73-63475 73 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/)	large-import t-logic t-combinatorics WIP	175/0	Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Substructures.lean	2	1	['github-actions']	nobody	285-30391 9 months ago	307-28032 10 months ago	0-0 0 seconds
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	283-48974 9 months ago	283-48977 9 months ago	0-0 0 seconds
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/)	t-algebra awaiting-author WIP label:t-algebra$	573/0	Mathlib.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basis.lean	2	15	['github-actions']	nobody	282-8612 9 months ago	282-8612 9 months ago	0-0 0 seconds
15355	adomani author:adomani	feat: MiM PR report	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	153/0	.github/workflows/monthly_pr_report.yaml,scripts/find_labels.sh	2	n/a	['YaelDillies', 'adomani', 'github-actions']	nobody	280-74934 9 months ago	unknown	unknown
21495	alreadydone author:alreadydone	experiment: reducible HasQuotient.quotient'	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI WIP	2/0	Mathlib/Algebra/Quotient.lean	1	1	['github-actions']	nobody	280-69024 9 months ago	280-69024 9 months ago	0-200 3 minutes
21496	alreadydone author:alreadydone	experiment: make SetLike.coe reducible	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-data	1/1	Mathlib/Data/SetLike/Basic.lean	1	1	['github-actions']	nobody	280-68793 9 months ago	280-68793 9 months ago	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/)	t-algebraic-geometry awaiting-author	419/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Torus.lean	2	4	['erdOne', 'github-actions', 'joelriou']	nobody	279-15798 9 months ago	279-33972 9 months ago	2-69252 2 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 t-meta modifies-tactic-syntax awaiting-author help-wanted	439/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/MAbel.lean,MathlibTest/mabel.lean	4	10	['BoltonBailey', 'dignissimus', 'github-actions', 'joneugster', 'kbuzzard']	joneugster assignee:joneugster	267-30335 8 months ago	272-11931 8 months ago	0-16 16 seconds
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	43/0	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean	1	1	['github-actions', 'j-loreaux']	nobody	267-29414 8 months ago	267-29414 8 months ago	13-33168 13 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/)	t-computability	698/0	Archive/Examples/SumOracle.lean,Mathlib.lean,Mathlib/Computability/QueryComplexity/Defs.lean,Mathlib/Computability/QueryComplexity/Sort.lean	4	4	['eric-wieser', 'girving', 'github-actions']	nobody	263-70671 8 months ago	264-25159 8 months ago	0-0 0 seconds
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/)	t-algebra awaiting-author label:t-algebra$	38/0	Mathlib/GroupTheory/Congruence/Defs.lean	1	8	['github-actions', 'hannahfechtner', 'kbuzzard', 'riccardobrasca']	nobody	261-66983 8 months ago	261-66983 8 months ago	87-64575 87 days
22302	CharredLee author:CharredLee	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/)	new-contributor t-category-theory awaiting-author	312/0	Mathlib.lean,Mathlib/CategoryTheory/Topos/Power.lean	2	2	['github-actions', 'joelriou']	b-mehta assignee:b-mehta	261-30610 8 months ago	261-31737 8 months ago	0-1528 25 minutes
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/)		2/0	scripts/bench/fake-root/lib/lean/libleanshared.so,scripts/bench/run	2	1	['github-actions']	nobody	258-26665 8 months ago	258-26728 8 months ago	0-0 0 seconds
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/)	large-import t-linter WIP	167/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/VariableVariable.lean,variableDeclarationVariable_replacements.py	5	1	['github-actions']	nobody	256-54132 8 months ago	258-75288 8 months ago	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/)	test-ci CI WIP	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	7	['github-actions', 'mergify']	nobody	254-53710 8 months ago	255-65409 8 months ago	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/)	t-algebra awaiting-author label:t-algebra$	36/1	Mathlib/Algebra/Order/Interval/Basic.lean	1	16	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	254-42331 8 months ago	290-46108 9 months ago	17-17852 17 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/)		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	4	['adomani', 'eric-wieser', 'github-actions']	nobody	250-84490 8 months ago	252-53776 8 months ago	0-0 0 seconds
22784	grunweg author:grunweg	feat: add Diffeomorph.sumSumSumComm	This matches `{Equiv,Homeomorph.sumSumSumComm}`, and is needed to prove that addition in the cobordism group is commutatives. From my bordism theory project. --- - depends on #22783 (easy pre-requisites) The current proof is not complete yet, and feels very painful. I'm not yet sure what's the best way to write this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	50/0	Mathlib/Geometry/Manifold/Diffeomorph.lean	1	1	['github-actions']	nobody	248-38163 8 months ago	248-60907 8 months ago	0-0 0 seconds
22846	mattrobball author:mattrobball	test		t-analysis	2/0	Mathlib/Analysis/Normed/Module/Basic.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	247-42671 8 months ago	247-44611 8 months ago	0-0 0 seconds
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/)	t-computability new-contributor awaiting-author	70/0	Mathlib.lean,Mathlib/Computability/PDA.lean	2	34	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	nobody	241-78157 7 months ago	241-78157 7 months ago	20-81771 20 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/)	infinity-cosmos t-category-theory WIP	22/1	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	1	['github-actions']	nobody	240-76269 7 months ago	240-76424 7 months ago	0-1 1 second
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/)	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	10	['FordUniver', 'YaelDillies', 'github-actions', 'kmill']	nobody	240-2282 7 months ago	240-37762 7 months ago	0-0 0 seconds
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/)	infinity-cosmos t-category-theory awaiting-author	52/9	Mathlib/CategoryTheory/Enriched/Limits/HasConicalLimits.lean	1	2	['github-actions', 'joelriou']	nobody	237-79415 7 months ago	237-79415 7 months ago	0-68906 19 hours
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/)	large-import t-algebra t-category-theory WIP label:t-algebra$	111/45	Mathlib/Order/DirectedInverseSystem.lean	1	1	['github-actions']	nobody	234-29806 7 months ago	234-29812 7 months ago	0-24 24 seconds
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/)	t-algebra awaiting-author label:t-algebra$	174/0	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/HomTensor.lean	2	26	['Whysoserioushah', 'YaelDillies', 'erdOne', 'github-actions', 'kbuzzard']	nobody	225-72429 7 months ago	226-78949 7 months ago	46-53384 46 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.	t-algebra awaiting-author label:t-algebra$	100/0	Mathlib.lean,Mathlib/LinearAlgebra/BilinearForm/Trace.lean	2	3	['github-actions', 'jcommelin']	nobody	223-62268 7 months ago	223-62268 7 months ago	23-44995 23 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/)	t-meta awaiting-author	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	220-74514 7 months ago	221-60813 7 months ago	4-80306 4 days
23772	SEU-Prime author:SEU-Prime	Create Amice.lean	i built amice equiv [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory WIP	283/0	Mathlib/NumberTheory/Padics/Amice.lean	1	2	['grunweg']	nobody	220-60962 7 months ago	220-60962 7 months ago	0-8688 2 hours
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/)	large-import new-contributor t-algebra awaiting-CI label:t-algebra$	169/0	Mathlib/Algebra/Free.lean	1	11	['YaelDillies', 'github-actions']	nobody	220-7083 7 months ago	220-7083 7 months ago	51-9403 51 days
24000	YaelDillies author:YaelDillies	feat: correspondence between Hopf algebras and affine group schemes	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 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric FLT t-algebraic-geometry WIP	127/0	Mathlib/AlgebraicGeometry/GroupScheme/HopfAffine.lean	1	3	['YaelDillies', 'github-actions', 'kbuzzard']	nobody	214-29722 7 months ago	214-67674 7 months ago	0-1 1 second
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/)	large-import t-logic awaiting-author	102/0	Mathlib/ModelTheory/Bundled.lean	1	26	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions']	nobody	213-86095 6 months ago	213-86095 6 months ago	50-58472 50 days
24086	mattrobball author:mattrobball	perf(Normed.Field.Basic): change parent order for `Semifield` and `Field` and reduce priority `toComm(Semi)Ring`	Passing through the projection `toComm(Semi)Ring` should not be preferred. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	8/2	Mathlib/Algebra/Field/Defs.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	212-52732 6 months ago	212-57532 6 months ago	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/)	CI t-meta awaiting-author	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	212-33686 6 months ago	486-51566 1 year ago	57-4216 57 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	190/1	Mathlib.lean,Mathlib/Analysis/Calculus/LineDeriv/Basic.lean,Mathlib/Analysis/Calculus/LineDeriv/Symmetric.lean	3	1	['github-actions']	nobody	211-913 6 months ago	211-913 6 months ago	0-0 0 seconds
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	210-37130 6 months ago	339-58703 11 months ago	349-46331 349 days
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/)	toric t-algebra WIP label:t-algebra$	193/0	Mathlib/LinearAlgebra/LinearIndependent/Tprod.lean	1	1	['github-actions']	nobody	205-55963 6 months ago	205-55963 6 months ago	0-2221 37 minutes
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/)	t-analysis	190/3	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/Schwarzian/Basic.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	204-67289 6 months ago	204-67307 6 months ago	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/)	t-algebra t-category-theory awaiting-author 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	41	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'qawbecrdtey']	nobody	204-23401 6 months ago	261-75482 8 months ago	20-7596 20 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/)	t-topology awaiting-author	229/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	30	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'peabrainiac']	YaelDillies assignee:YaelDillies	203-75724 6 months ago	207-83658 6 months ago	56-56728 56 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/)	t-order WIP	148/0	Mathlib.lean,Mathlib/Order/Filter/AtMaxMin.lean	2	4	['github-actions', 'plp127', 'urkud']	nobody	203-12841 6 months ago	225-73899 7 months ago	0-0 0 seconds
18861	YaelDillies author:YaelDillies	refactor: make `Set.mem_graphOn` defeq	The definition as an image is cute but not very useful. Also unsimp `graphOn_univ` since the RHS contains `f` more times than the LHS does. --- Later, I would like to introduce `Set.graph` to have a `Set` version with good defeqs of `LinearMap.graph` and alike [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	72/18	Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean	4	4	['YaelDillies', 'b-mehta', 'github-actions']	nobody	195-2309 6 months ago	235-42018 7 months ago	2-24624 2 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/)	large-import t-topology WIP	205/2	Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Card.lean,Mathlib/Topology/Instances/ENat.lean	3	2	['eric-wieser', 'github-actions']	nobody	194-84590 6 months ago	194-84590 6 months ago	14-6036 14 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/)	new-contributor t-algebra t-category-theory WIP 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	194-84554 6 months ago	194-84554 6 months ago	0-0 0 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/)	large-import t-meta	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	8	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	194-84276 6 months ago	194-84276 6 months ago	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	194-83584 6 months ago	194-83584 6 months ago	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/)	FLT t-topology awaiting-author	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	10	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	193-67368 6 months ago	200-9520 6 months 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/)	t-linter WIP	78/1	Mathlib/Tactic/Linter/Lint.lean,test/Lint.lean	2	4	['adomani', 'github-actions', 'grunweg']	nobody	193-38436 6 months ago	193-73050 6 months ago	0-0 0 seconds
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/)	awaiting-zulip t-computability new-contributor awaiting-author	298/0	Mathlib.lean,Mathlib/Computability/GNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/RegularExpressions.lean,docs/references.bib	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'trivial1711']	nobody	192-30873 6 months ago	192-30882 6 months 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/)	awaiting-zulip t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'meithecatte', 'qawbecrdtey']	nobody	192-30184 6 months ago	192-30819 6 months ago	75-77754 75 days
23220	mattrobball author:mattrobball	refactor(Module.LinearMap.Defs): make `SemilinearMapClass` extend `AddMonoidHomClass`	Currently `SemilinearMapClass` extends `AddHomClass`. As both `SemilinearMapClass.toAddHomClass` and `AddMonoidHomClass.toAddHomClass` are projections, they have the same priority. With `SemilinearMapClass` declared later, it wins causing expensive failed searches in the algebraic hierarchy before `AddMonoidHomClass.toAddHomClass` is found. The current instance `SemilinearMapClass.toAddMonoidHomClass` has lower priority so we may need to downgrade the priority of the projection also. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	6/10	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	191-32319 6 months ago	191-32319 6 months ago	45-6308 45 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/)	t-topology WIP	54/0	Mathlib/Topology/Metrizable/Uniformity.lean	1	1	['github-actions']	nobody	190-41093 6 months ago	190-41093 6 months ago	0-1 1 second
23213	mattrobball author:mattrobball	chore(RingTheory.Derivation): add a `LinearMapClass` instance	Often we want `simp` to call `map_zero` or `map_add` for a `Derivation`. To find the `ZeroHomClass` or `AddHomClass` instance necessary it starts to climb up the type class hierarchy including looking for a `LinearMapClass` instance which didn't exist. Consequently, sythesis would look in a lot of crazy places trying to summon ring structures on the module or on derivations itself. Here we add the missing `LinearMapClass` instance so that `simp` is more efficient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	8	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	189-31531 6 months ago	189-31531 6 months ago	47-39026 47 days
23214	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	6	['github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	189-31297 6 months ago	189-31297 6 months ago	47-32152 47 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/)	t-data RFC t-meta awaiting-author	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	2	['github-actions', 'urkud']	nobody	189-28674 6 months ago	189-28674 6 months ago	20-83091 20 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/)	t-computability new-contributor awaiting-author	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	54	['YaelDillies', 'github-actions', 'madvorak', 'shetzl']	YaelDillies assignee:YaelDillies	188-75548 6 months ago	188-75548 6 months ago	72-3718 72 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/)	t-logic awaiting-author	62/0	Mathlib/ModelTheory/Substructures.lean	1	19	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	188-50868 6 months ago	188-50868 6 months 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 new-contributor awaiting-author	2/24	Mathlib/Computability/EpsilonNFA.lean	1	2	['YaelDillies', 'github-actions', 'urkud']	nobody	186-76412 6 months ago	186-76412 6 months ago	27-52316 27 days
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/)	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	1	['github-actions']	nobody	184-82881 6 months ago	184-82881 6 months ago	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/)	t-analysis WIP	145/0	Mathlib/Analysis/Convex/Schur.lean	1	16	['b-mehta', 'eric-wieser', 'github-actions']	nobody	183-63945 5 months ago	192-43883 6 months ago	0-2 2 seconds
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	181-63089 5 months ago	181-64539 5 months ago	181-64582 181 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/)	new-contributor t-analysis WIP help-wanted	287/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	6	['MithicSpirit', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	MithicSpirit assignee:MithicSpirit	180-46558 5 months ago	180-46576 5 months ago	0-0 0 seconds
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/)	t-category-theory awaiting-author	144/0	Mathlib.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/Pi/Monoidal.lean,Mathlib/CategoryTheory/Pi/MonoidalClosed.lean	4	19	['TwoFX', 'YaelDillies', 'b-mehta', 'github-actions', 'jcommelin', 'sinhp']	nobody	177-84785 5 months ago	177-84785 5 months ago	54-54882 54 days
11155	smorel394 author:smorel394	feat(LinearAlgebra/Multilinear/DirectSum, LinearAlgebra/DirectSum/{PiTensorProduct,Finsupp}): interaction between `MultilinearMap` and `DirectSum`, and between `PiTensorProduct` and `DirectSum`	This does three things: * `MultilinearMap.fromDirectSumEquiv` (in `LinearAlgebra/MultilinearMap/DirectSum.lean`) calculates `MultilinearMap`s on a family of `DirectSum`s. More precisely, if `ι` is a `Fintype`, if `κ i` is a family of types indexed by `ι` and we have a `R`-module `M i j` for every `i : ι` and `j : κ i`, this is the linear equivalence between `Π p : (i : ι) → κ i, MultilinearMap R (fun i ↦ M i (p i)) M'` and `MultilinearMap R (fun i ↦ ⨁ j : κ i, M i j) M'`. * `PiTensorProduct.directSum` (in `LinearAlgebra/DirectSum/PiTensorProduct.lean`): the distributivity property of a `PiTensorProduct` with respect to `DirectSum`s in all its arguments. * `finsuppPiTensorProduct` (in `LinearAlgebra/DirectSum/Finsupp.lean`): If `ι` is a `Fintype`, `κ i` is a family of types indexed by `ι` and `M i` is a family of `R`-modules indexed by `ι`, then the tensor product of the family `κ i →₀ M i` is linearly equivalent to `∏ i, κ i →₀ ⨂[R] i, M i`. - [x] depends on: #11152 - [x] depends on: #11196 - [x] depends on: #17881 - [x] depends on: #17932 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra please-adopt label:t-algebra$	322/0	Mathlib.lean,Mathlib/LinearAlgebra/DFinsupp/PiTensorProduct.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean	6	32	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	174-22146 5 months ago	174-24351 5 months ago	6-23591 6 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/)	t-data t-order t-algebraic-geometry WIP	362/0	Mathlib.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	173-48203 5 months ago	173-48203 5 months ago	0-1720 28 minutes
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/)	t-order WIP	141/0	Mathlib.lean,Mathlib/Data/Prod/RevLex.lean	2	4	['ScottCarnahan', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	170-3248 5 months ago	170-14941 5 months ago	19-33859 19 days
25170	eric-wieser author:eric-wieser	refactor: make basis computable	I claim that in the long run, `Basis.repr` should be a `DFinsupp` not `Finsupp`, so that it is computable. To make this change incrementally, we can store a `DFinsupp` internally today, and keep `repr` and `ofRepr` working with finsupp. This at least would allow building a large basis object, and then using `repr'` to compute with it. The cost of this intermediate state is a loss of many defeqs. --- - [ ] depends on: #25166 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	66/21	Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	168-26641 5 months ago	168-78039 5 months ago	0-0 0 seconds
24065	kim-em author:kim-em	chore: script to give topological sort of modules	This script is not useful by itself: it just gives a topological sort of Mathlib's import graph. But I've several times found it useful when I want to modify many files systematically with minimal rebuilding: just work backwards through the list.	awaiting-author	96/0	scripts/README.md,scripts/topological_sort.py	2	5	['github-actions', 'jcommelin', 'kim-em']	jcommelin assignee:jcommelin	165-2416 5 months ago	165-2416 5 months ago	48-7769 48 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/)	awaiting-zulip t-computability new-contributor awaiting-author	159/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	59	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'meithecatte', 'urkud']	EtienneC30 assignee:EtienneC30	162-83044 5 months ago	192-30783 6 months ago	48-67492 48 days
25429	Paul-Lez author:Paul-Lez	feat(Analysis/PDE/Quasilinear/Defs): Add definitions about quasilinear first order PDEs	This PR introduces some basic definitions related to first order quasilinear PDEs. In a subsequent PR (I'm currently cleaning up the code), these will be used to state and prove some results about how solutions to quasilinear PDEs vary along characteristic curves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	141/0	Mathlib.lean,Mathlib/Analysis/PDE/Quasilinear/Defs.lean	2	1	['github-actions']	nobody	162-64529 5 months ago	162-72699 5 months ago	0-0 0 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	161-65320 5 months ago	161-66210 5 months ago	0-11212 3 hours
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/)	t-data new-contributor awaiting-author	129/1	Mathlib.lean,Mathlib/Data/List/Commutativity.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/Lemmas.lean	4	35	['MrSumato', 'github-actions', 'grunweg', 'plp127']	grunweg assignee:grunweg	160-64821 5 months ago	160-64821 5 months ago	29-59355 29 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/)	awaiting-zulip t-computability new-contributor	101/10	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	41	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'meithecatte']	nobody	159-40435 5 months ago	159-40436 5 months ago	34-10595 34 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	158-73543 5 months ago	159-16079 5 months ago	0-0 0 seconds
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/)	t-algebra WIP label:t-algebra$	21/0	Mathlib/Algebra/Module/Equiv/Defs.lean	1	1	['github-actions']	nobody	157-86252 5 months ago	157-86252 5 months ago	20-7584 20 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/)	t-algebra WIP label:t-algebra$	28/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	1	['github-actions']	nobody	157-86227 5 months ago	157-86227 5 months ago	20-11468 20 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/)	t-category-theory awaiting-author	370/0	Mathlib.lean,Mathlib/CategoryTheory/Category/Quiv/Shapes.lean,Mathlib/CategoryTheory/Category/Quiv/WalkingQuiver.lean,Mathlib/Logic/Small/Defs.lean	4	13	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'robertmaxton42', 'robin-carlier']	nobody	156-65250 5 months ago	160-29263 5 months ago	0-80193 22 hours
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.	new-contributor t-analysis awaiting-author	111/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	12	['Paul-Lez', 'github-actions', 'grunweg', 'mhk119']	nobody	156-24940 5 months ago	217-66636 7 months ago	30-77130 30 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/)	t-algebra please-adopt label:t-algebra$	16/5	Mathlib/RingTheory/OreLocalization/Basic.lean	1	6	['erdOne', 'github-actions', 'kbuzzard']	nobody	156-22518 5 months ago	156-24609 5 months ago	53-20069 53 days
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/)	large-import t-data	52/4	Mathlib/Data/Sym/Sym2/Fin.lean,Mathlib/Data/Sym/Sym2/Order.lean	2	1	['github-actions']	nobody	156-21544 5 months ago	156-21544 5 months ago	0-0 0 seconds
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	t-category-theory t-meta awaiting-author	162/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,scripts/noshake.json	4	1	['github-actions']	nobody	154-83001 5 months ago	154-83030 5 months ago	0-0 0 seconds
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/)	t-linter awaiting-author	105/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/DeprecatedSimpLemma.lean,MathlibTest/DeprecatedSimpLemmaTest.lean	4	7	['adomani', 'github-actions', 'grunweg']	nobody	154-79114 5 months ago	158-34931 5 months ago	0-34675 9 hours
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	t-topology WIP	148/0	Mathlib.lean,Mathlib/AlgebraicTopology/Anodyne.lean,Mathlib/AlgebraicTopology/KanFibration.lean,Mathlib/CategoryTheory/MorphismProperty/WeakSaturation.lean	4	1	['github-actions']	nobody	154-71802 5 months ago	154-71819 5 months ago	0-2 2 seconds
25835	erdOne author:erdOne	WIP: Weierstrass elliptic functions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21662. Original PR: https://github.com/leanprover-community/mathlib4/pull/21662	t-analysis WIP	1461/0	Mathlib/Analysis/Elliptic/Basic.lean	1	1	['github-actions']	nobody	153-77979 5 months ago	153-78021 5 months ago	0-33 33 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/)	large-import t-order	31/0	Mathlib/Order/Atoms.lean	1	1	['github-actions']	nobody	153-71261 5 months ago	153-71261 5 months ago	0-0 0 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data delegated	5/0	Mathlib/Data/Int/ModEq.lean	1	3	['fpvandoorn', 'github-actions', 'mathlib-bors']	nobody	153-23757 5 months ago	153-59295 5 months ago	1-19951 1 day
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 label:t-algebra$	18/8	Mathlib/LinearAlgebra/Dimension/Finite.lean	1	1	['github-actions']	nobody	152-51218 4 months ago	152-51244 4 months ago	0-0 0 seconds
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	151-57008 4 months ago	151-57011 4 months ago	0-0 0 seconds
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	151-55152 4 months ago	151-55240 4 months ago	0-0 0 seconds
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	t-number-theory	265/45	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	2	['Multramate', 'github-actions']	nobody	150-31057 4 months ago	150-31057 4 months ago	0-0 0 seconds
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	t-algebraic-geometry	0/12	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	n/a	['Multramate', 'github-actions', 'grunweg']	nobody	149-77618 4 months ago	unknown	unknown
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	migrated-from-branch t-meta WIP	86/0	scripts/RecordNamespaces.lean,scripts/namespace-overlap.py	2	1	['github-actions']	nobody	149-43019 4 months ago	149-43019 4 months ago	2-11832 2 days
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	146-34852 4 months ago	146-34852 4 months ago	0-1331 22 minutes
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	144-31631 4 months ago	282-1945 9 months ago	0-0 0 seconds
26293	RemyDegenne author:RemyDegenne	feat: tightness from convergence of characteristic functions	If the characteristic functions of a sequence of measures `μ : ℕ → Measure E` on a finite dimensional inner product space converge pointwise to a function which is continuous at 0, then `{μ n \| n}` is tight. --- - [x] depends on: #24838 - [x] depends on: #24846 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24949. Original PR: https://github.com/leanprover-community/mathlib4/pull/24949	t-measure-probability WIP	352/2	Mathlib.lean,Mathlib/MeasureTheory/Measure/TightCharFun.lean,Mathlib/MeasureTheory/Measure/TightNormed.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	143-79889 4 months ago	143-79890 4 months ago	0-2 2 seconds
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/)	t-computability	305/0	Mathlib.lean,Mathlib/Computability/QueryComplexity/Basic.lean,Mathlib/Computability/QueryComplexity/Defs.lean	3	59	['eric-wieser', 'girving', 'github-actions', 'quangvdao', 'tomaz1502']	nobody	143-59684 4 months ago	295-52872 9 months ago	295-52846 295 days
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	143-29648 4 months ago	143-29737 4 months ago	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	229/0	Mathlib.lean,Mathlib/Geometry/Manifold/SliceModel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	142-44149 4 months ago	142-54829 4 months ago	142-56279 142 days
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 t-analysis t-topology WIP label:t-algebra$	150/0	Mathlib/RingTheory/Perfectoid.lean	1	2	['github-actions', 'jjdishere']	nobody	142-14192 4 months ago	142-14199 4 months ago	0-69 1 minute
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	t-data	201/0	Mathlib.lean,Mathlib/Data/Nat/LogFueled.lean	2	2	['AntoineChambert-Loir', 'github-actions']	nobody	140-74124 4 months ago	140-74126 4 months ago	140-74166 140 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.	new-contributor t-number-theory awaiting-author	217/0	Mathlib.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticResidueRoots.lean	4	2	['github-actions', 'kckennylau']	literandltx assignee:literandltx	136-78297 4 months ago	137-20983 4 months ago	17-63153 17 days
25993	Multramate author:Multramate	feat(Algebra/Group/Units/Hom): add map lemmas	This PR continues the work from #25609. Original PR: https://github.com/leanprover-community/mathlib4/pull/25609	t-algebra awaiting-author label:t-algebra$	27/10	Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Hom.lean	2	5	['Multramate', 'Ruben-VandeVelde', 'github-actions']	nobody	135-80049 4 months ago	135-80049 4 months ago	14-37502 14 days
26013	tsuki8 author:tsuki8	feat(Data/Finset/Card,Data/Set/Finite/Basic)	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/)	t-data new-contributor awaiting-author	15/0	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Set/Finite/Basic.lean	2	5	['Ruben-VandeVelde', 'github-actions']	nobody	135-66672 4 months ago	135-78964 4 months ago	13-85893 13 days
26283	kckennylau author:kckennylau	(WIP) Resultant	--- 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/)	t-algebra WIP 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	1	['github-actions']	nobody	134-21577 4 months ago	144-8994 4 months ago	0-19 19 seconds
26743	grunweg author:grunweg	WIP: product rule for Lie bracket on manifolds	On the path towards geodesics and the Levi-Civita connection. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	119/22	Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean	2	1	['github-actions']	nobody	132-39733 4 months ago	132-61207 4 months ago	0-1 1 second
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/)	CI awaiting-author	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	44	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	132-11184 4 months ago	132-11184 4 months ago	78-54824 78 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	131-65105 4 months ago	131-65140 4 months ago	164-52401 164 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	128-79632 4 months ago	129-43183 4 months ago	0-0 0 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	t-category-theory WIP	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	1	['github-actions']	nobody	125-71877 4 months ago	125-71896 4 months ago	0-45 45 seconds
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/)	t-topology easy awaiting-author	9/0	Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	1	4	['Paul-Lez', 'github-actions', 'grunweg']	nobody	125-58289 4 months ago	125-59711 4 months ago	0-11233 3 hours
27069	FrankieNC author:FrankieNC	feat(Analysis/MetricSpace/HausdorffDimension): prove dimH of intervals and segments is 1	Add theorems `dimH_Icc01` and `dimH_segment` showing that the Hausdorff dimension of the unit interval [0,1] and of any non-degenerate real segment is 1. The key idea is that the segment is the image of [0,1] under a bi-Lipschitz map. We explicitly construct this map and prove it is both Lipschitz and antilipschitz, allowing us to transfer the dimension result from the unit interval. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	63/0	Mathlib/Topology/MetricSpace/HausdorffDimension.lean	1	10	['AntoineChambert-Loir', 'FrankieNC', 'github-actions', 'grunweg']	nobody	123-38722 4 months ago	123-51206 4 months ago	0-13398 3 hours
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/)	t-meta awaiting-author	201/26	Mathlib/Tactic/ScopedNS.lean,MathlibTest/scopedNS.lean	2	7	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'kbuzzard']	nobody	119-72768 3 months ago	262-72273 8 months ago	41-32344 41 days
27187	Komyyy author:Komyyy	feat: `NONote` represents ordinals < ε₀	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory WIP	186/12	Mathlib/SetTheory/Ordinal/Notation.lean	1	2	['github-actions', 'vihdzp']	nobody	115-23428 3 months ago	121-13876 3 months ago	0-2 2 seconds
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	115-16893 3 months ago	115-37218 3 months ago	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/)	t-meta awaiting-author	161/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Suffa.lean,test/Suffa.lean	4	3	['MoritzBeroRoos', 'YaelDillies']	nobody	113-47855 3 months ago	525-70095 1 year ago	58-85902 58 days
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/)	t-analysis WIP	311/0	Mathlib/Analysis/Normed/Algebra/Logarithm.lean	1	1	['github-actions']	nobody	112-54001 3 months ago	112-54339 3 months ago	0-29 29 seconds
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/)	t-meta WIP	73/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/DivisorsAntidiag.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	111-61232 3 months ago	111-61251 3 months ago	0-260 4 minutes
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/)	t-linter WIP	84/1	Mathlib/Tactic/Linter/CommandStart.lean,MathlibTest/CommandStart.lean	2	2	['github-actions', 'grunweg']	nobody	110-71234 3 months ago	110-71305 3 months ago	0-2 2 seconds
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.	new-contributor t-algebra awaiting-author label:t-algebra$	465/0	Mathlib.lean,Mathlib/Algebra/Polynomial/ZMod.lean	2	2	['Ruben-VandeVelde', 'github-actions']	nobody	110-40818 3 months ago	110-40818 3 months ago	25-6199 25 days
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/)	CI awaiting-author	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	7	['bryangingechen', 'github-actions', 'grunweg', 'j-loreaux']	robertylewis assignee:robertylewis	108-26875 3 months ago	108-26875 3 months ago	146-23504 146 days
26307	j-loreaux author:j-loreaux	refactor: make `IsIdempotentElem` a one-field structure	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	29/22	Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Idempotent.lean	5	1	['github-actions']	nobody	107-45772 3 months ago	143-56312 4 months ago	0-0 0 seconds
27677	jkpjkpjkp author:jkpjkpjkp	extend tactic `observe` as syntax sugar for `grind`	--- The `observe` tactic now attempts to use the `grind` tactic as a fallback when library search (exact?) fails. cc. https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/.22Missing.20Tactics.22.20list/near/531764184 this drafty version does not update doc or `observe?`, as details and decisions may need further discussion.	new-contributor t-meta	31/8	Mathlib/Tactic/Observe.lean	1	2	['euprunin', 'github-actions']	nobody	105-39450 3 months ago	106-72698 3 months ago	0-0 0 seconds
27297	hugh-fox author:hugh-fox	feat: add an equality between sums and products of cartesian products	Adds `prod_mul_eq_prod_product` and a version for Finsets `prod_range_mul_eq_prod_product` with to show an equality between `Fin (i * j)` and `Fin a × Fin b`. It is likely `prod_range_mul_eq_prod_product` belongs in a different file, in which case only the first commit should be considered. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/BigOperators/Fin.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'hugh-fox', 'j-loreaux', 'kckennylau']	nobody	106-41342 3 months ago	110-33330 3 months ago	7-6727 7 days
27704	vihdzp author:vihdzp	feat: link `Minimal` and `IsLeast` together	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	24/0	Mathlib/Order/Bounds/Basic.lean	1	3	['b-mehta', 'github-actions']	nobody	105-65647 3 months ago	105-65647 3 months ago	0-52136 14 hours
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	230/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean	3	21	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	105-51144 3 months ago	105-51176 3 months ago	26-39463 26 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/)	carleson t-topology WIP	142/36	Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	2	1	['github-actions']	nobody	105-34057 3 months ago	105-55626 3 months ago	0-2 2 seconds
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 awaiting-author	259/37	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	8	['MichaelStollBayreuth', 'Multramate', 'github-actions', 'tb65536']	tb65536 assignee:tb65536	105-30527 3 months ago	105-30527 3 months ago	45-1019 45 days
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	104-69428 3 months ago	104-70626 3 months ago	0-14 14 seconds
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/)	new-contributor t-category-theory awaiting-author	70/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	12	['YunkaiZhang233', 'b-mehta', 'github-actions', 'robin-carlier']	nobody	104-58545 3 months ago	105-54426 3 months ago	0-3448 57 minutes
27826	Louddy author:Louddy	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/)	t-algebra WIP label:t-algebra$	4/0	Mathlib/Algebra/Ring/Subsemiring/Defs.lean	1	3	['Louddy', 'eric-wieser', 'github-actions']	nobody	104-50910 3 months ago	104-53992 3 months ago	0-8982 2 hours
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/)	t-data awaiting-author	183/0	Mathlib/Control/Monad/Cont.lean	1	8	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	104-13438 3 months ago	123-31121 4 months ago	0-85623 23 hours
25916	BoltonBailey author:BoltonBailey	feat: add `simp` lemma `coeff_eq_zero_of_not_mem_support`	Adds the forward direction of `not_mem_support_iff` as a simp lemma. Original PR: https://github.com/leanprover-community/mathlib4/pull/13026	t-algebra awaiting-author label:t-algebra$	4/0	Mathlib/Algebra/MvPolynomial/Basic.lean	1	2	['BoltonBailey', 'github-actions']	nobody	103-54562 3 months ago	151-55448 4 months ago	0-8 8 seconds
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/)	t-meta awaiting-author	21/9	Mathlib/Tactic/Lift.lean,MathlibTest/lift.lean	2	8	['JovanGerb', 'adomani', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vihdzp']	JovanGerb assignee:JovanGerb	103-16929 3 months ago	103-63829 3 months ago	15-64386 15 days
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	large-import t-algebra WIP label:t-algebra$	888/0	Mathlib.lean,Mathlib/Data/Sym/Sym2/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Basis.lean	3	n/a	['github-actions', 'mans0954']	nobody	101-75080 3 months ago	unknown	unknown
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	t-algebra 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	2	['github-actions', 'mans0954']	nobody	101-75076 3 months ago	101-75076 3 months ago	142-86001 142 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/)	t-linter awaiting-author WIP	63/1	Mathlib.lean,Mathlib/Data/Array/Extract.lean,Mathlib/New.lean,Mathlib/Tactic/Linter/CommandStart.lean	4	20	['adomani', 'bryangingechen', 'github-actions']	nobody	101-75037 3 months ago	101-75038 3 months ago	0-0 0 seconds
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	101-74986 3 months ago	101-74986 3 months ago	0-0 0 seconds
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	t-algebra WIP 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	n/a	['github-actions', 'mans0954']	nobody	101-74924 3 months ago	unknown	unknown
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	t-number-theory awaiting-author	101/4	Mathlib/NumberTheory/Divisors.lean	1	36	['MichaelStollBayreuth', 'github-actions', 'upobir']	mariainesdff assignee:mariainesdff	101-60372 3 months ago	101-60372 3 months ago	46-1067 46 days
26483	metakunt author:metakunt	feat (RingTheory/RootsOfUnity/PrimitiveRoots) : Add equiv_primitiveRoots_of_coprimePow	Adds equivalence of r-th primitive roots by a coprime e.	t-ring-theory new-contributor awaiting-author	79/0	Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	1	13	['Citronhat', 'Ruben-VandeVelde', 'github-actions', 'metakunt']	nobody	100-77246 3 months ago	100-77246 3 months ago	28-81831 28 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/)	t-ring-theory awaiting-author	81/0	Mathlib.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	2	5	['github-actions', 'kckennylau']	YaelDillies assignee:YaelDillies	100-77162 3 months ago	100-77162 3 months ago	37-40835 37 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/)	t-ring-theory awaiting-author	99/1	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/RightExact.lean,Mathlib/RingTheory/Flat/CategoryTheory.lean	4	2	['github-actions', 'kim-em']	nobody	100-76760 3 months ago	100-76760 3 months ago	6-6256 6 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/)	t-ring-theory awaiting-author	37/1	Mathlib/RingTheory/Flat/CategoryTheory.lean	1	3	['github-actions', 'kim-em']	nobody	100-76748 3 months ago	100-76748 3 months ago	3-28223 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/)	t-category-theory WIP	218/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Presheaf/LeftExtension.lean	2	3	['erdOne', 'github-actions', 'robin-carlier']	erdOne assignee:erdOne	100-73462 3 months ago	100-73483 3 months ago	15-69033 15 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/)	t-order awaiting-author	394/0	Mathlib.lean,Mathlib/Order/SigmaCompleteLattice.lean	2	8	['PierreQuinton', 'YaelDillies', 'github-actions', 'vihdzp']	YaelDillies assignee:YaelDillies	100-51739 3 months ago	100-51739 3 months ago	12-33338 12 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.	new-contributor t-measure-probability	13/0	Mathlib/MeasureTheory/PiSystem.lean	1	13	['EtienneC30', 'KiringYJ', 'github-actions', 'ocfnash']	RemyDegenne assignee:RemyDegenne	98-21700 3 months ago	105-57749 3 months ago	132-45580 132 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/)	t-order	121/8	Mathlib.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/LawfulSupInf.lean	3	25	['PierreQuinton', 'YaelDillies', 'github-actions', 'plp127', 'vihdzp']	YaelDillies assignee:YaelDillies	97-71877 3 months ago	109-55174 3 months ago	109-55196 109 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/)	t-data easy awaiting-author	11/9	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Indicator.lean	2	3	['github-actions', 'ocfnash', 'tristan-f-r']	nobody	97-35336 3 months ago	97-79155 3 months ago	0-85904 23 hours
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/)	large-import t-linter WIP	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	13	['Hagb', 'github-actions', 'grunweg']	nobody	96-38038 3 months ago	101-38295 3 months ago	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-ring-theory t-algebra t-topology WIP label:t-algebra$	616/0	Mathlib/RingTheory/Polynomial/Hensel.lean	1	1	['github-actions']	nobody	96-20771 3 months ago	96-20781 3 months ago	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/)	large-import t-algebra t-topology awaiting-author label:t-algebra$	138/3	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Topology/Algebra/LinearTopology.lean	2	21	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions', 'grunweg']	ADedecker and AntoineChambert-Loir assignee:AntoineChambert-Loir assignee:ADedecker	96-8569 3 months ago	96-8569 3 months ago	124-78308 124 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/)	new-contributor t-differential-geometry awaiting-author	80/0	Mathlib.lean,Mathlib/Geometry/Manifold/ZeroDim.lean	2	13	['fyqing', 'github-actions', 'grunweg', 'tb65536']	grunweg assignee:grunweg	94-68272 3 months ago	104-29088 3 months ago	0-6418 1 hour
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	94-53832 3 months ago	94-53868 3 months ago	0-1886 31 minutes
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	t-topology	509/1	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Ultra/Pseudometrizable.lean	3	8	['ADedecker', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	urkud assignee:urkud	94-21717 3 months ago	157-9027 5 months ago	172-40949 172 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	new-contributor t-combinatorics awaiting-author	14/0	Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	1	3	['b-mehta', 'github-actions', 'xcloudyunx']	b-mehta assignee:b-mehta	94-9659 3 months ago	94-23739 3 months ago	25-83942 25 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/)	will-close-soon new-contributor t-analysis awaiting-author WIP help-wanted	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	11	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	92-72183 3 months ago	92-72386 3 months ago	4-24257 4 days
26125	faenuccio author:faenuccio	first commit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	dependency-bump WIP	56/1	Hammer/experiment1.lean,lake-manifest.json,lakefile.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	90-81048 2 months ago	90-81048 2 months ago	0-19 19 seconds
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	t-analysis help-wanted	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	88-37810 2 months ago	101-75095 3 months ago	5-42837 5 days
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. Note the issue with the existing `MonadExcept` instance still applies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	16/0	Mathlib/Control/Monad/Cont.lean	1	25	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	87-70811 2 months ago	484-5125 1 year ago	339-53816 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	87-70082 2 months ago	87-70101 2 months ago	0-0 0 seconds
23881	YaelDillies author:YaelDillies	feat: `ℝ≥0`-valued Lᵖ norm	This is useful when inputting the Lp norm in places that expect a real number, like an exponent. From LeanAPAP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	218/6	Mathlib.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/NNLpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean	4	20	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	87-60010 2 months ago	87-60029 2 months ago	13-15316 13 days
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/)	t-ring-theory	455/13	Mathlib/RingTheory/Valuation/Basic.lean,MathlibTest/Simproc/ValEquiv.lean	2	34	['b-mehta', 'eric-wieser', 'github-actions', 'kckennylau', 'pechersky', 'plp127']	erdOne assignee:erdOne	87-21707 2 months ago	97-43399 3 months ago	98-17892 98 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/)	t-data WIP	7/0	Mathlib/Data/Nat/ModEq.lean	1	4	['faenuccio', 'github-actions', 'leanprover-bot']	nobody	86-76464 2 months ago	86-78983 2 months ago	0-22 22 seconds
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/)	t-algebra awaiting-CI awaiting-author label:t-algebra$	100/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	3	['Timeroot', 'YaelDillies', 'github-actions']	nobody	86-74347 2 months ago	86-74347 2 months ago	0-21917 6 hours
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	t-order awaiting-author	14/0	Mathlib/Order/Directed.lean	1	4	['github-actions', 'j-loreaux', 'plp127']	nobody	86-39323 2 months ago	86-39323 2 months ago	19-20394 19 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.	new-contributor t-combinatorics	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	1	['github-actions']	awainverse assignee:awainverse	86-21715 2 months ago	97-40184 3 months ago	97-40217 97 days
28186	Sebi-Kumar author:Sebi-Kumar	feat(Topology/Homotopy/Path): Add IsEquiv instance for Path.Homotopic	Add `instance : IsEquiv (Path x₀ x₁) Homotopic` to the library. Allow use of lemmas like `of_eq` when proving two paths are homotopic. --- To provide additional context, I am relatively new to contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at the University of Western Ontario and supervised by Chris Kapulkin and Daniel Carranza. My goal is to prove that the `n`-sphere is simply connected for `n > 1`. Also, I am not super familiar with `IsEquiv` and when it should/shouldn't be used. I just wanted to use a lemma like `Path.Homotopic.of_eq` at one point while working on my code, and thought this was the best way to add such a result to the library. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	5/0	Mathlib/Topology/Homotopy/Path.lean	1	4	['Sebi-Kumar', 'github-actions', 'kckennylau']	PatrickMassot assignee:PatrickMassot	86-21712 2 months ago	95-53042 3 months ago	95-53078 95 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/)	t-data awaiting-author	44/22	Mathlib/Data/Int/GCD.lean	1	5	['astrainfinita', 'b-mehta', 'eric-wieser', 'github-actions', 'nomeata', 'urkud']	nobody	85-82157 2 months ago	138-24854 4 months ago	58-34020 58 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 awaiting-author	133/0	Mathlib/RingTheory/PowerSeries/Substitution.lean	1	9	['chrisflav', 'erdOne', 'github-actions', 'kckennylau']	kbuzzard assignee:kbuzzard	85-81987 2 months ago	85-81987 2 months ago	48-29860 48 days
28680	vihdzp author:vihdzp	feat: set has cardinality one iff singleton	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory easy awaiting-author	11/1	Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Defs.lean	2	5	['b-mehta', 'github-actions', 'kckennylau']	nobody	85-62348 2 months ago	85-62348 2 months ago	0-24645 6 hours
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/)	t-algebraic-geometry awaiting-author	44/0	Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean	1	12	['MichaelStollBayreuth', 'Multramate', 'acmepjz', 'dagurtomas', 'github-actions', 'kckennylau']	dagurtomas assignee:dagurtomas	84-56872 2 months ago	84-56872 2 months ago	64-11252 64 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/)	t-data new-contributor awaiting-author	326/0	Mathlib/Data/Nat/Choose/AbelBinomial.lean	1	28	['ElifUskuplu', 'FrankieNC', 'github-actions', 'iu-isgood']	nobody	82-54491 2 months ago	106-32388 3 months ago	0-533 8 minutes
25700	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 - [ ] depends on: #25698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC please-adopt	15/0	MathlibTest/DeprecatedSyntaxLinter.lean,MathlibTest/Monotonicity.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	82-54136 2 months ago	82-54178 2 months ago	72-55831 72 days
28821	yury-harmonic author:yury-harmonic	feat(SimpleGraph/Finite): add lemmas	`simpNF` complains because `*Finset` are `abbrev`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	24/1	Mathlib/Combinatorics/SimpleGraph/Finite.lean	1	1	['github-actions']	nobody	82-37503 2 months ago	82-37553 2 months ago	0-0 0 seconds
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/)	large-import t-order t-topology	160/2	Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/WithZeroTopology.lean,Mathlib/Topology/Compactness/Compact.lean	3	1	['github-actions']	PatrickMassot assignee:PatrickMassot	81-21689 2 months ago	93-3905 3 months ago	93-6603 93 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/)	new-contributor t-combinatorics awaiting-author	187/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Cycle.lean	2	41	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	80-82550 2 months ago	80-82550 2 months ago	123-22718 123 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/)	new-contributor t-combinatorics awaiting-author	1266/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/IndependenceNumber.lean	2	9	['Pjotr5', 'github-actions', 'grunweg']	nobody	79-85518 2 months ago	82-53727 2 months ago	39-17587 39 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	t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Matrix/NonsingularInverse.lean	1	16	['eric-wieser', 'github-actions', 'madvorak', 'ocfnash']	nobody	79-79428 2 months ago	101-61405 3 months ago	86-39206 86 days
27242	hugh-fox author:hugh-fox	feat: add Gauss-like formula for sums of digit sums	Adds `sum_digit_sum_base_pow_eq` to show a Gauss-like formula across sums of digit sums. This relies on an additional two simp lemmas, named `digits_sum_eq_self`, `digits_sum_base_mul_cancel`. Lastly, includes a specialization (which is a good bit simpler than the general formula) to base 10 named `sum_digit_sum_ten_pow_eq`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor awaiting-author	113/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	5	['github-actions', 'hugh-fox', 'kckennylau']	nobody	79-60487 2 months ago	79-60487 2 months ago	39-41606 39 days
27261	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add definition for subpaths	Define subpaths as restrictions of paths to subintervals, reparameterized to have domain `[0, 1]` and possibly with a reverse of direction. Prove their basic properties. This serves as an alternative to `Path.truncate` which is useful for the explicit construction of certain homotopies, in particular regarding the concatenation of subpaths. --- To provide additional context, this is my first time contributing to Mathlib, and I am doing so as a part of the Fields Undergraduate Summer Research Program hosted at Western University. My intention for this file is for it to be used when proving that the fundamental group of the sphere is trivial (following the proof from Hatcher's "Algebraic Topology"). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author	146/0	Mathlib.lean,Mathlib/Topology/Subpath.lean	2	24	['ADedecker', 'FrankieNC', 'Sebi-Kumar', 'github-actions', 'themathqueen', 'wwylele']	ADedecker assignee:ADedecker	78-61927 2 months ago	84-30418 2 months ago	34-15767 34 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/)	t-set-theory awaiting-author	381/0	Mathlib.lean,Mathlib/SetTheory/ZFC/Axioms.lean,docs/references.bib	3	49	['b-mehta', 'digama0', 'github-actions', 'kckennylau', 'leanprover-community-bot-assistant', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	78-56242 2 months ago	81-48321 2 months ago	40-53883 40 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/)	t-data	144/5	Mathlib/Data/PFunctor/Univariate/Basic.lean	1	19	['alexkeizer', 'eric-wieser', 'github-actions', 'quangvdao']	eric-wieser assignee:eric-wieser	78-55072 2 months ago	128-22779 4 months ago	128-22811 128 days
29030	b-mehta author:b-mehta	feat(Combinatorics): prove the Rado selection lemma	Prove the Rado selection lemma, a generic result useful to prove a variety of compactness results in combinatorics. This generalises Konig's infinity lemma, and the de Bruijn-Erdos theorem, and allows the former to be conveniently stated in the language of sets rather than categories. This is a draft PR for now, since the imports are not correct and the names need fixing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	80/0	Mathlib/Combinatorics/SimpleGraph/DeBruijnErdos.lean	1	1	['github-actions']	nobody	78-50303 2 months ago	78-50474 2 months ago	0-0 0 seconds
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/)	t-algebra blocked-by-core-PR label:t-algebra$	3/7	Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/External.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-bot']	nobody	78-50165 2 months ago	78-50165 2 months ago	3-19989 3 days
23238	YaelDillies author:YaelDillies	feat: extended floor and ceil	My motivation for this is to prove `ENat.toENNReal (⨆ i, f i) = ⨆ i, ENat.toENNReal (f i)` and `ENat.toENNReal (⨅ i, f i) = ⨅ i, ENat.toENNReal (f i)`. Kalle Kytölä independently needs this for his formalisation of statistical physics. From MiscYD --- - [x] depends on: #24781 - [x] depends on: #24782 See #15269 for a past attempt. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	235/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean	2	25	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kkytola', 'mathlib4-dependent-issues-bot', 'urkud']	alreadydone assignee:alreadydone	78-49348 2 months ago	186-46713 6 months ago	234-12518 234 days
28056	grunweg author:grunweg	wip: existence of Riemannian metrics	Work in progress: will require the material of #26221 (orthonormal frames), hence first be developed there. --- - [x] depends on: #26875 - [x] depends on: #28046 (just nice to have, not strictly necessary) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	785/0	Mathlib.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric.lean,Mathlib/Geometry/Manifold/ExistsRiemannianMetric2.lean,Mathlib/Geometry/Manifold/VectorBundle/Riemannian.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	78-44956 2 months ago	78-45029 2 months ago	0-0 0 seconds
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/)	t-measure-probability awaiting-CI	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	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	78-4260 2 months ago	78-4286 2 months ago	0-0 0 seconds
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/)	file-removed FLT t-measure-probability awaiting-CI WIP	205/78	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	21	['YaelDillies', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	78-4074 2 months ago	78-4097 2 months ago	8-77637 8 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 t-meta delegated awaiting-author	75/3	Mathlib/Util/Delaborators.lean,Mathlib/Util/PPOptions.lean,MathlibTest/delaborators.lean	3	18	['JovanGerb', 'Rob23oba', 'eric-wieser', 'github-actions', 'kmill', 'mathlib-bors', 'plp127']	alexjbest assignee:alexjbest	77-49872 2 months ago	77-50754 2 months ago	83-71907 83 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/)	t-meta	136/5	Mathlib.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Util/Trace.lean,MathlibTest/norm_num_trace.lean	4	19	['JovanGerb', 'eric-wieser', 'github-actions', 'kmill', 'leanprover-bot', 'mathlib-bors', 'plp127']	JovanGerb assignee:JovanGerb	77-1894 2 months ago	93-29778 3 months ago	93-29755 93 days
26240	grunweg author:grunweg	perf(CommandLinterLinter): use Substring more	Probably, these changes make little difference, but let's find out. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC	14/15	Mathlib/Tactic/Linter/CommandStart.lean	1	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	joneugster assignee:joneugster	76-79496 2 months ago	146-30659 4 months ago	146-35258 146 days
26299	adomani author:adomani	perf: the `commandStart` 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-author	48/0	Mathlib/Tactic/Linter/CommandStart.lean	1	7	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	joneugster assignee:joneugster	76-79348 2 months ago	76-79470 2 months ago	66-73556 66 days
26455	ScottCarnahan author:ScottCarnahan	WIP - 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/)	t-algebra WIP 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	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	75-83876 2 months ago	75-83894 2 months ago	0-17731 4 hours
26156	oliver-butterley author:oliver-butterley	feat(MeasureTheory.VectorMeasure) : add a definition of total variation for VectorMeasure	This PR adds variation for any `VectorMeasure` using a supremum definition. Currently mathlib has `TotalVariation` defined for a signed measure using the Hahn-Jordan decomposition, but this doesn't generalise. Motivation: generally this is an important concept but specifically as a step for proving RMK in the complex case which in turn is a step to prove the spectral theorem. Co-authored-by: @yoh-tanimoto This PR was migrated from #25442. PR divided into smaller pieces, this is just the definition without additional lemmas. PRs adding further results related to variation are: * #26160 * #26165 * #26168 (shows that for `SignedMeasures` the two definitions of variation coincide) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	358/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean	2	32	['EtienneC30', 'github-actions', 'yoh-tanimoto']	EtienneC30 assignee:EtienneC30	74-60954 2 months ago	105-54074 3 months ago	42-9361 42 days
28279	Equilibris author:Equilibris	feat: univ generic W	A simple change making `W.ind`'s motive universe generic. --- A theorem `w_ind_eq` will now be needed, but this will depend on getting `dcongr_heq` merged, and hence I will do this in a separate PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	16/21	Mathlib/Data/PFunctor/Multivariate/W.lean	1	8	['Equilibris', 'alexkeizer', 'github-actions']	nobody	74-39700 2 months ago	94-966 3 months ago	0-0 0 seconds
25920	BoltonBailey author:BoltonBailey	feat(Data/Finsupp/Basic): `Finsupp.optionElim'`	Similar to how Finsupp.cons constructs a map Fin (n + 1) →₀ M from a map Fin n →₀ M, we define Finsupp.optionElim' to construct a map Option α →₀ M from a map α →₀ M, given an additional value for none. We base this on the new optionEquiv definition. As a function, it behaves as Option.elim', hence the name. We prove a variety of API lemmas, based on those for Finsupp.cons, to bring the definitions more in line with the contents of Data/Finsupp/Fin. We also refactor to a new file to help avoid a too-long file and make this more analogous to Finsupp.cons Original PR: https://github.com/leanprover-community/mathlib4/pull/13861 - [x] depends on: #26309	migrated-from-branch t-data	114/23	Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Option.lean	2	15	['BoltonBailey', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	74-1339 2 months ago	74-6385 2 months ago	138-63260 138 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/)	t-algebra t-topology awaiting-author label:t-algebra$	299/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	7	['Thmoas-Guan', 'github-actions', 'grunweg', 'jcommelin']	jcommelin assignee:jcommelin	73-67421 2 months ago	73-67421 2 months ago	189-33553 189 days
29232	vihdzp author:vihdzp	feat: more theorems on `SuccAddOrder`	We make use of the (relatively) new `CanonicallyOrderedAdd` typeclass in order to generalize various theorems on `Ordinal` to `SuccAddOrder`. Later on we'll deprecate the `Ordinal` versions in favor of these. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	54/1	Mathlib/Algebra/Order/SuccPred.lean	1	2	['github-actions', 'plp127']	nobody	71-54099 2 months ago	73-11569 2 months ago	73-11598 73 days
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	71-27775 2 months ago	127-62849 4 months ago	127-62890 127 days
26310	kckennylau author:kckennylau	Binary form	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/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	70-62918 2 months ago	86-52589 2 months ago	57-1104 57 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/)	t-category-theory awaiting-CI	136/0	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Fiber.lean,Mathlib/CategoryTheory/Limits/Shapes/Fiberwise.lean	3	24	['github-actions', 'kckennylau', 'robin-carlier']	nobody	70-60801 2 months ago	70-60801 2 months ago	19-15685 19 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/)	t-measure-probability awaiting-author	91/0	Mathlib.lean,Mathlib/MeasureTheory/Function/LInfty.lean	2	5	['JonBannon', 'github-actions', 'j-loreaux']	nobody	70-55802 2 months ago	72-48466 2 months ago	4-12126 4 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/)	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	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	70-23642 2 months ago	70-23664 2 months ago	181-78920 181 days
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	69-86050 2 months ago	69-86050 2 months ago	18-47707 18 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/)	new-contributor t-combinatorics	375/0	Mathlib.lean,Mathlib/Combinatorics/Hypergraph/Basic.lean	2	52	['b-mehta', 'espottesmith', 'github-actions', 'jt496', 'lauramonk', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	69-74165 2 months ago	69-74165 2 months ago	75-60343 75 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/)	t-algebra awaiting-author label:t-algebra$	34/0	Mathlib/Algebra/QuadraticDiscriminant.lean	1	8	['chrisflav', 'github-actions', 'tb65536', 'upobir']	chrisflav assignee:chrisflav	68-58954 2 months ago	92-50482 3 months ago	55-10605 55 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/)	t-algebra awaiting-author label:t-algebra$	270/0	Mathlib.lean,Mathlib/RepresentationTheory/CrossProductAlgebra/Defs.lean,docs/references.bib	3	8	['Whysoserioushah', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	67-82614 2 months ago	67-82614 2 months ago	5-63264 5 days
28511	YaelDillies author:YaelDillies	feat(Finsupp): `congr!`-compatible version of `prod_congr`	`congr!` doesn't like the `g1 x (f x)` appearing in the hypothesis of `Finsupp.prod_congr`: `f x` isn't a free variable. Note: A few proofs broke due to `simp` using `congr` lemmas internally. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	17/11	Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean	5	12	['JovanGerb', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	kmill assignee:kmill	67-72799 2 months ago	89-79254 2 months ago	89-79283 89 days
27701	vihdzp author:vihdzp	feat: `a < b + c ↔ a < b ∨ ∃ d < c, a = b + d`	...and analogous results on `CanonicallyOrderedAdd`. --- - [x] depends on: #29084 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	41/0	Mathlib/Algebra/Order/Monoid/Canonical/Basic.lean	1	5	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	66-61841 2 months ago	66-61881 2 months ago	0-42619 11 hours
26881	emo916math author:emo916math	feat(Analysis/Calculus/Deriv/Star) A formula for `deriv (conj ∘ f ∘ conj)`	Added a lemma that `deriv (conj ∘ f ∘ conj) = conj ∘ deriv f ∘ conj`, proved by cases on whether the derivative mathematically exists or not. This PR replaces [#26805](https://github.com/leanprover-community/mathlib4/pull/26805); see discussion there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	50/2	Mathlib/Analysis/Calculus/Deriv/Star.lean	1	15	['emo916math', 'github-actions', 'j-loreaux', 'kckennylau']	j-loreaux assignee:j-loreaux	66-55790 2 months ago	97-55344 3 months ago	31-70593 31 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/)	t-data awaiting-author	31/0	Mathlib/Data/ULift.lean	1	23	['eric-wieser', 'github-actions', 'grunweg', 'robertmaxton42']	nobody	66-53599 2 months ago	77-83614 2 months ago	118-2181 118 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/)	new-contributor t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/LinearAlgebra/Projection.lean	1	7	['PSchwahn', 'github-actions', 'joelriou', 'kckennylau']	joelriou assignee:joelriou	66-25859 2 months ago	66-56962 2 months ago	73-43225 73 days
29434	ntapiam author:ntapiam	feat(NonAssoc/LieAdmissible): prove every ring/algebra is LieAdmissible	-awaiting-author	new-contributor t-algebra label:t-algebra$	27/6	Mathlib/Algebra/NonAssoc/LieAdmissible/Defs.lean	1	1	['github-actions']	nobody	65-83638 2 months ago	66-76414 2 months ago	66-76448 66 days
28286	bwangpj author:bwangpj	feat(Geometry/Manifold/ContMDiff): basic lemmas for analytic (`C^ω`) functions	Add basic lemmas relating `ContMDiff` in the `C^ω` case to being `Analytic` on charts. This is upstreamed from [https://github.com/girving/ray](https://github.com/girving/ray). Co-authored-by: Geoffrey Irving --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-differential-geometry awaiting-author	36/0	Mathlib/Geometry/Manifold/ContMDiff/Defs.lean	1	13	['bwangpj', 'girving', 'github-actions', 'grunweg', 'kbuzzard', 'sgouezel']	sgouezel assignee:sgouezel	65-40614 2 months ago	65-81049 2 months ago	27-76128 27 days
26614	Rida-Hamadani author:Rida-Hamadani	feat(SimpleGraph): add more API for `take`/`drop`	These came up while proving the Girth-Diameter inequality. The main lemma proves that taking `n` vertices of a walk results in a sub-walk of taking `k` vertices when `n` is less than or equal to `k`. The sub-walk relation is represented as `p.support.Sublist q.support` where `p` and `q` are walks. - [ ] depends on: #26655 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	74/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	18	['Rida-Hamadani', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	65-29492 2 months ago	65-29524 2 months ago	4-83551 4 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/)	t-meta	79/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Apply.lean,MathlibTest/Simproc/Apply.lean	4	27	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'hrmacbeth', 'kckennylau']	JovanGerb assignee:JovanGerb	64-74534 2 months ago	70-46095 2 months ago	88-15750 88 days
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.	CI WIP	475/0	scripts/README.md,scripts/check_github_urls.py	2	2	['github-actions', 'kim-em']	nobody	64-19238 2 months ago	64-19918 2 months ago	0-1 1 second
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/)	t-algebra awaiting-author label:t-algebra$	53/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/VectorBundle.lean	2	4	['Kiolt', 'Raph-DG', 'chrisflav', 'github-actions']	chrisflav assignee:chrisflav	63-72009 2 months ago	106-39690 3 months ago	16-82639 16 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/)	new-contributor t-measure-probability awaiting-author	8/0	Mathlib/MeasureTheory/Integral/Bochner/Set.lean	1	6	['RemyDegenne', 'github-actions', 'sgouezel', 'thefundamentaltheor3m']	nobody	63-56483 2 months ago	154-64316 5 months ago	0-11893 3 hours
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/)	t-category-theory t-meta WIP	714/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/Associators.lean,MathlibTest/CategoryTheory/Associators.lean	4	1	['github-actions']	nobody	62-5621 2 months ago	127-85796 4 months ago	0-16 16 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/)	bench-after-CI t-analysis easy	9/1	Mathlib/Analysis/Complex/Basic.lean	1	1	['github-actions']	nobody	61-74927 2 months ago	61-74997 2 months ago	61-74982 61 days
24184	YaelDillies author:YaelDillies	feat: `[G : H]` notation for the index of `H : Subgroup G`	This is a cute notation which I wrote for FLT. Not sure whether we want it in mathlib nor how to include `relindex` in the picture. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC label:t-algebra$	5/0	Mathlib/GroupTheory/Index.lean	1	8	['YaelDillies', 'erdOne', 'github-actions', 'j-loreaux', 'kbuzzard', 'mathlib4-merge-conflict-bot']	eric-wieser assignee:eric-wieser	61-43011 2 months ago	61-43036 2 months ago	209-30746 209 days
22043	YaelDillies author:YaelDillies	chore: shortcut instance for `Neg ℤˣ`	This lets us avoid importing `Ring` in downstream files (most of the effect is to come). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	20/47	Mathlib.lean,Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/Algebra/Ring/Int/Units.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/Int/AbsoluteValue.lean,Mathlib/Data/Int/Associated.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/NumberTheory/NumberField/Basic.lean,MathlibTest/Zify.lean	12	17	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors']	eric-wieser assignee:eric-wieser	59-80506 1 month ago	183-63543 5 months ago	268-36562 268 days
26110	YaelDillies author:YaelDillies	feat: sharp monoids	Define sharp monoids, which are the monoids whose only unit is `1`. This concept is useful in log geometry and in particular shows up in the theory of affine monoids. This concept already existed in the guise of `Subsingleton Mˣ`, but giving it a name makes it easier to refer to and uncovers some missing instances. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	51/30	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Irreducible/Defs.lean,Mathlib/Algebra/Group/Pi/Units.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/GroupWithZero/Divisibility.lean,Mathlib/Data/List/Prime.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/ChainOfDivisors.lean,Mathlib/RingTheory/IntegralDomain.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean,Mathlib/RingTheory/Valuation/Integers.lean	18	7	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'vihdzp']	adomani assignee:adomani	59-54644 1 month ago	63-49075 2 months ago	147-49112 147 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/)	t-data awaiting-author help-wanted	198/0	Mathlib.lean,Mathlib/Data/Nat/Choose/Wolstenholme.lean	2	3	['github-actions', 'yury-harmonic']	nobody	59-45150 1 month ago	59-45150 1 month ago	0-125 2 minutes
29720	javra author:javra	feat(CategoryTheory): `TransportEnrichment` and `ForgetEnrichment` as 2-functors	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	63/1	Mathlib/CategoryTheory/Enriched/Basic.lean,Mathlib/CategoryTheory/Enriched/EnrichedCat.lean	2	1	['github-actions']	nobody	58-61437 1 month ago	58-61451 1 month ago	0-24 24 seconds
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	58-39465 1 month ago	78-2402 2 months ago	78-72324 78 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/)	t-logic awaiting-author	6/0	Mathlib/Logic/Basic.lean	1	8	['YaelDillies', 'fpvandoorn', 'github-actions', 'madvorak', 'vihdzp']	fpvandoorn assignee:fpvandoorn	57-76198 1 month ago	83-76983 2 months ago	17-70200 17 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 - [ ] depends on: #27820	t-number-theory awaiting-author	199/0	Mathlib/NumberTheory/SelbergSieve.lean	1	33	['FLDutchmann', 'MichaelStollBayreuth', 'bryangingechen', 'github-actions', 'jcommelin', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	56-76569 1 month ago	56-76569 1 month ago	8-1328 8 days
29530	ShreckYe author:ShreckYe	feat(Dynamics/PeriodicPts): some theorems for `Pi.map` in `Dynamics/PeriodicPts` analogous to those for `Prod.map`	Split from #29204. Some namespace prefixes are added in `GroupTheory/OrderOfElement.lean` to distinguish the extra imports introduced. - [ ] depends on: #29528	large-import	77/8	Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	dupuisf assignee:dupuisf	56-21701 1 month ago	63-47534 2 months ago	63-48182 63 days
25899	pfaffelh author:pfaffelh	feat(Topology/Compactness/CompactSystem): introduce compact Systems	A compact system is a set systems with the property that, whenever a countable intersections of sets in the set system is empty, there is a finite subset of sets with empty intersection. These are needed e.g. in measure theory if one wants to show sigma-additivity of a set function on a ring. * Main result: The set of sets which are either compact and closed, or `univ`, is a compact system. * Introduce `Dissipate s x := ⋂ y ≤ x, s y` (Data/Set/Dissipate), which is parallel to Data/Set/Accumulate. Co-authored-by: Rémy Degenne remydegenne@gmail.com --- This PR continues the work from #24541. Original PR: https://github.com/leanprover-community/mathlib4/pull/24541	t-topology awaiting-author	453/1	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	5	26	['github-actions', 'pfaffelh', 'sgouezel']	PatrickMassot assignee:PatrickMassot	55-70119 1 month ago	55-70119 1 month ago	70-65301 70 days
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	large-import t-measure-probability 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	6	['github-actions', 'sgouezel']	kex-y assignee:kex-y	55-69633 1 month ago	55-69633 1 month ago	31-59168 31 days
26051	Komyyy author:Komyyy	feat(Mathlib/GroupTheory/SpecificGroups/Alternating): A_n is simple iff n = 3 or 5 ≤ n	--- - [x] depends on: #25299 - [x] depends on: #25314 - [x] depends on: #25367 - [x] depends on: #26098 - [x] depends on: #26552 - [x] depends on: #27498 - [x] depends on: #29234 This PR continues the work from #23555. Original PR: https://github.com/leanprover-community/mathlib4/pull/23555 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import WIP	289/71	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Simple.lean,Mathlib/GroupTheory/Subgroup/Simple.lean	4	13	['Komyyy', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	nobody	55-48104 1 month ago	72-62419 2 months ago	10-66608 10 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	large-import t-analysis WIP	51/3	Mathlib.lean,Mathlib/Analysis/Meromorphic/Complex.lean,Mathlib/Analysis/Meromorphic/Gamma.lean	3	13	['Komyyy', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-dependent-issues-bot']	j-loreaux assignee:j-loreaux	55-40918 1 month ago	55-41340 1 month ago	30-62878 30 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/)	t-order awaiting-author	8/2	Mathlib/Order/SuccPred/Basic.lean	1	3	['YaelDillies', 'github-actions', 'plp127', 'vihdzp']	bryangingechen assignee:bryangingechen	55-33813 1 month ago	55-33813 1 month ago	44-13238 44 days
29400	ShreckYe author:ShreckYe	feat(`Algebra/BigOperators`): products of the results of insertion and removal on tuples and lists, and some needed lemmas		large-import	102/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/Vector/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean	6	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	55-33545 1 month ago	67-69497 2 months ago	67-69536 67 days
29235	yoh-tanimoto author:yoh-tanimoto	feat(Topology/Algebra/Module/ClosedSubmodule): add `mapEquiv`, a variation of `ClosedSubmodule.map` for CLE	add `ClosedSubmodule.mapEquiv` for continuous linear equivalence. In this case, a closed submodule is mapped to a closed submodule, so the definitions are easier and behave nicely with `closure` and `⊔`. motivation: needed to define standard subspaces in a Hilbert space (scalar multiplication by `Complex.I`) #29251 https://ems.press/content/serial-article-files/48171 - [x] depends on: #29230 for `Lattice` `CompleteLattice`	t-topology	69/1	Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	fpvandoorn assignee:fpvandoorn	54-31447 1 month ago	62-51261 2 months ago	62-53543 62 days
29500	vihdzp author:vihdzp	feat: `WellFoundedLT (LowerSet α)`	We prove that `LowerSet α` is well-founded when `α` is a WQO. --- This result is used in the CGT repository to construct the poset game! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	31/0	Mathlib.lean,Mathlib/Order/UpperLower/WellFounded.lean	2	2	['github-actions', 'plp127']	bryangingechen assignee:bryangingechen	53-65335 1 month ago	53-65335 1 month ago	10-85553 10 days
29870	mckoen author:mckoen	feat(CategoryTheory/Adhesive): subobjects in adhesive categories have binary coproducts	A formalization of Theorem 5.1 in https://www.ioc.ee/~pawel/papers/adhesivejournal.pdf. Given `A B Z : C` with `C` adhesive, and `a : A ⟶ Z`, ` b : B ⟶ Z` monomorphisms, then `pushout.desc a b pullback.condition` is also a monomorphism. This result will be useful in showing that the pushout-product of monomorphisms is also a monomorphism. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	118/0	Mathlib/CategoryTheory/Adhesive.lean	1	1	['github-actions']	nobody	53-29217 1 month ago	53-29264 1 month ago	0-9 9 seconds
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/)	t-meta	36/23	Mathlib/Tactic/Ring/Basic.lean	1	1	['github-actions']	nobody	52-24651 1 month ago	52-24662 1 month ago	0-0 0 seconds
29688	tb65536 author:tb65536	feat(FieldTheory/IsGaloisGroup): prove the Galois correspondence for `IsGaloisGroup`	This PR reproves the Galois correspondence for `IsGaloisGroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	89/0	Mathlib/FieldTheory/Galois/IsGaloisGroup.lean	1	1	['github-actions']	joneugster assignee:joneugster	52-21707 1 month ago	59-36423 1 month ago	59-36396 59 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/)	t-algebraic-geometry awaiting-author	312/0	Mathlib.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Sites/BigAffineZariski.lean	3	32	['chrisflav', 'github-actions', 'joelriou', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	51-75979 1 month ago	51-75979 1 month ago	4-4834 4 days
28175	dsfxcimk author:dsfxcimk	feat: exterior angle theorem	Add Exterior angle theorem --- The Exterior Angle Theorem states that the exterior angle of a triangle equals the sum of the two non-adjacent interior angles. I plan to place this in Mathlib.Geometry.Euclidean.Triangle [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-euclidean-geometry awaiting-author	10/0	Mathlib/Geometry/Euclidean/Triangle.lean,docs/1000.yaml	2	16	['FrankieNC', 'JovanGerb', 'dsfxcimk', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	51-51570 1 month ago	65-64437 2 months ago	28-57160 28 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 label:t-algebra$	180/2	Mathlib/LinearAlgebra/LinearPMap.lean	1	2	['github-actions', 'mcdoll']	kim-em assignee:kim-em	51-35475 1 month ago	59-46426 1 month ago	59-46399 59 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.	new-contributor t-analysis awaiting-author	383/0	Mathlib/Analysis/Complex/Residue/Basic.lean	1	17	['Periecle', 'github-actions', 'hrmacbeth', 'llllvvuu', 'loefflerd']	nobody	50-59961 1 month ago	61-62064 2 months ago	1-5255 1 day
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/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Orientation.lean,Mathlib/Combinatorics/Digraph/Tournament.lean	3	5	['JaafarTanoukhi', 'NotWearingPants', 'Rida-Hamadani', 'github-actions']	kmill assignee:kmill	50-51362 1 month ago	81-41599 2 months ago	81-41628 81 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	t-ring-theory awaiting-author	77/8	Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	2	46	['chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'ocfnash']	chrisflav assignee:chrisflav	50-35524 1 month ago	51-76939 1 month ago	82-34290 82 days
29596	alreadydone author:alreadydone	chore(Algebra): extract `Submonoid.IsLocalizationMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	282/119	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/IsLocalization.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/Lemmas.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Localization/Defs.lean	7	3	['github-actions', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	50-21705 1 month ago	57-61662 1 month ago	61-74579 61 days
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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	288/1	Mathlib.lean,Mathlib/MeasureTheory/Measure/Sub.lean,Mathlib/MeasureTheory/Measure/SubFinite.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Kernel/RadonNikodym.lean,Mathlib/Probability/Kernel/Sub.lean	6	1	['github-actions']	nobody	49-76438 1 month ago	49-79528 1 month ago	0-1 1 second
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	33/23	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	49-53322 1 month ago	49-53322 1 month ago	1-17350 1 day
29622	uniwuni author:uniwuni	feat(RepresentationTheory/Commutative): simple representations of commutative monoids are 1-dimensional	Shows that for a commutative monoid, the simple finite dimensional representations over algebraically closed fields are all 1-dimensional. --- Some things in here I am a bit uncomfortable with. `FDRep` seems to be not particularly fleshed out yet, so I had to explicitly construct embeddings and so on instead of using `Rep.subrepresentation`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	101/2	Mathlib.lean,Mathlib/RepresentationTheory/Commutative.lean,Mathlib/RepresentationTheory/FDRep.lean,docs/undergrad.yaml	4	13	['github-actions', 'riccardobrasca', 'uniwuni']	riccardobrasca assignee:riccardobrasca	46-84278 1 month ago	46-84278 1 month ago	14-46245 14 days
24050	Paul-Lez author:Paul-Lez	feat(Data/Finsupp/Pointwise): generalise pointwise scalar multiplication of finsupps	As pointed out by @eric-wieser, this creates an instance diamond with `SMul (α → β) (α →₀ (α → β))` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	7/4	Mathlib/Data/Finsupp/Pointwise.lean	1	8	['Paul-Lez', 'eric-wieser', 'github-actions', 'kckennylau', 'pechersky']	pechersky assignee:pechersky	45-18549 1 month ago	45-18788 1 month ago	168-19511 168 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)	t-data t-algebra awaiting-author label:t-algebra$	137/16	Mathlib/Data/DFinsupp/Defs.lean,Mathlib/LinearAlgebra/DFinsupp.lean	2	12	['github-actions', 'mathlib4-dependent-issues-bot', 'pechersky']	pechersky assignee:pechersky	45-17822 1 month ago	45-17822 1 month ago	19-26510 19 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	t-data awaiting-author	360/0	MathlibTest/Junk.lean	1	17	['NotWearingPants', 'Timeroot', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	45-17039 1 month ago	45-17039 1 month ago	96-70055 96 days
28452	plp127 author:plp127	feat: Define `ZMod.fintype` without cases	Define `ZMod.fintype` without casing on `n` except inside the proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	2/3	Mathlib/Data/ZMod/Defs.lean	1	2	['github-actions', 'jcommelin']	pechersky assignee:pechersky	45-16258 1 month ago	45-16258 1 month ago	46-561 46 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	large-import t-topology	174/5	Mathlib/Topology/Compactness/CompactlyCoherentSpace.lean	1	4	['github-actions', 'joelriou', 'scholzhannah']	ADedecker assignee:ADedecker	43-78341 1 month ago	44-64063 1 month ago	143-44469 143 days
24789	Ruben-VandeVelde author:Ruben-VandeVelde	chore: move Algebra.Group.Hom.End to Algebra.Ring	This moves us towards the goal of not depending on `Ring` under `Algebra.Group`; this is mentioned in https://github.com/leanprover-community/mathlib4/issues/11757 and on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Call.20for.20help.3A.20technical.2F.20organisational.20debt/near/512348574). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra awaiting-author label:t-algebra$	4/10	Mathlib.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Module/End.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/Ring/Hom/End.lean	5	9	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	43-74367 1 month ago	43-74367 1 month ago	14-7845 14 days
30105	slashbade author:slashbade	feat: add `reap` as internal tactic	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-meta	664/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Reap.lean,Mathlib/Tactic/Reap/Basic.lean,Mathlib/Tactic/Reap/Future/Basic.lean,Mathlib/Tactic/Reap/Future/PP.lean,Mathlib/Tactic/Reap/OpenAIClient/Basic.lean,Mathlib/Tactic/Reap/OpenAIClient/Test.lean,Mathlib/Tactic/Reap/OpenAIClient/Types.lean,Mathlib/Tactic/Reap/Options.lean,Mathlib/Tactic/Reap/PremiseSelection/API.lean,Mathlib/Tactic/Reap/PremiseSelection/Syntax.lean,Mathlib/Tactic/Reap/PremiseSelection/Test.lean,Mathlib/Tactic/Reap/Requests/Basic.lean,Mathlib/Tactic/Reap/Requests/Future.lean,Mathlib/Tactic/Reap/Requests/Test.lean,Mathlib/Tactic/Reap/Tactic/Generator.lean,Mathlib/Tactic/Reap/Tactic/Search.lean,Mathlib/Tactic/Reap/Tactic/Syntax.lean,Mathlib/Tactic/Reap/Tactic/Test.lean	21	1	['github-actions']	nobody	43-74259 1 month ago	43-85683 1 month ago	0-0 0 seconds
26287	mbkybky author:mbkybky	feat(Data/ENat/Lattice): coercion to `WithBot ℕ∞` commutes with `biSup`	The coercion from `ℕ∞` to `WithBot ℕ∞` commutes with `biSup` and `biInf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	24/0	Mathlib/Data/ENat/Lattice.lean	1	5	['github-actions', 'kckennylau', 'mbkybky']	ericrbg assignee:ericrbg	43-58434 1 month ago	43-58434 1 month ago	123-59653 123 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/)	new-contributor t-dynamics	401/0	Mathlib.lean,Mathlib/Dynamics/BirkhoffSum/Pointwise.lean	2	13	['D-Thomine', 'github-actions', 'leanprover-community-bot-assistant', 'lua-vr', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	42-75618 1 month ago	80-8061 2 months ago	86-63924 86 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 [ ] depends on: #30141 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	83/1	Mathlib/Topology/Baire/NonMeagre.lean,Mathlib/Topology/GDelta/Basic.lean	2	1	['github-actions']	nobody	42-32092 1 month ago	42-32094 1 month ago	42-32131 42 days
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/)	t-category-theory WIP	112/0	Mathlib/CategoryTheory/Sites/Multifork.lean	1	3	['chrisflav', 'github-actions', 'joelriou']	nobody	42-28256 1 month ago	45-7004 1 month ago	0-1 1 second
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/)	t-meta awaiting-author	24/9	Mathlib/Tactic/Bound.lean	1	10	['JovanGerb', 'Timeroot', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	42-24564 1 month ago	42-24564 1 month ago	69-47369 69 days
29734	bwangpj author:bwangpj	feat(Probability/Kernel): \phi-irreducibility of kernels	Define powers of kernels, the Chapman-Kolmogorov equations, as well as \phi-irreducibility of kernels, following Robert-Casella, "Monte Carlo Statistical Methods", Definition 6.13. Co-authored-by: Matteo Cipollina @or4nge19 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	160/8	Mathlib.lean,Mathlib/Probability/Kernel/Composition/Comp.lean,Mathlib/Probability/Kernel/Composition/CompMap.lean,Mathlib/Probability/Kernel/Irreducible.lean,docs/references.bib	5	6	['RemyDegenne', 'bwangpj', 'github-actions']	RemyDegenne assignee:RemyDegenne	41-67645 1 month ago	51-56803 1 month ago	58-9437 58 days
29376	vlad902 author:vlad902	feat(SimpleGraph): helper lemmas for `Walk.IsSubwalk`		t-combinatorics	29/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	awainverse assignee:awainverse	40-77890 1 month ago	68-85807 2 months ago	68-85837 68 days
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/)	t-algebra WIP label:t-algebra$	101/125	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	11	['fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	40-77202 1 month ago	40-77236 1 month ago	0-17 17 seconds
25814	vlad902 author:vlad902	feat(SimpleGraph): weaker condition for paths in acyclic graphs	`IsAcyclic.isPath_iff_chain'` defines a weaker condition for proving that a walk is a path, in particular it shows that rather than proving that all vertices in the support of a walk are distinct, one must only show that consecutive edges are distinct (e.g. every other vertex must be distinct.) This leads to a simple corollary that trails are also paths in acyclic graphs. I had a need for this when formalizing Cayley graphs, since this condition maps cleanly onto words in free groups being reduced. --- This PR continues the work from #25630. Original PR: https://github.com/leanprover-community/mathlib4/pull/25630	t-combinatorics	38/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean	2	2	['github-actions', 'vlad902']	kmill assignee:kmill	40-76886 1 month ago	154-60299 5 months ago	154-60269 154 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 new-contributor awaiting-author	196/0	Archive.lean,Archive/Imo/Imo1975Q3.lean	2	36	['Antidite', 'LLaurance', 'github-actions', 'jsm28']	jsm28 assignee:jsm28	40-40751 1 month ago	40-40751 1 month ago	46-38383 46 days
25760	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory): (2,1)-categories and `Pith`	This PR introduces a class `IsLocallyGroupoid` on bicategories, asserting that every hom-category has an `IsGroupoid` instance. With this definition, `IsLocallyGroupoid (LocallyDiscrete C)` is correctly inferred. Given a bicategory `B`, we introduce a type alias `Pith B` for `B` (realized as a one-field structure), and we equip it with a `Bicategory` instance where the hom-categories are the cores of the hom-categories of `B`. We show that this bicategory is a (2,1)-category, construct an inclusion pseudo-functor from `Pith B` to `B`, and show that every pseudofunctor from a (2,1)-category to `B` factors through this inclusion. --- We can’t fully state the fact that `(pseudofunctorToPith F).comp (inclusion F)` "is" `F` because #18254 is still not merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25150. Original PR: https://github.com/leanprover-community/mathlib4/pull/25150	t-category-theory awaiting-author	178/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/LocallyGroupoid.lean,Mathlib/CategoryTheory/Core.lean	3	8	['b-mehta', 'github-actions', 'joelriou', 'robin-carlier']	joelriou assignee:joelriou	40-34408 1 month ago	40-34408 1 month ago	105-83970 105 days
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	t-data	30/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	2	['github-actions', 'mans0954']	alreadydone assignee:alreadydone	39-48457 1 month ago	101-75089 3 months ago	142-84490 142 days
26346	mans0954 author:mans0954	feat(LinearAlgebra/QuadraticForm/TensorProduct): Extend `baseChange_ext` to work over a free module	This PR continues the work from #21814. Original PR: https://github.com/leanprover-community/mathlib4/pull/21814	t-algebra WIP label:t-algebra$	105/5	Mathlib/LinearAlgebra/Basis/Bilinear.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	2	2	['github-actions', 'mans0954']	nobody	39-48452 1 month ago	137-41177 4 months ago	0-0 0 seconds
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-topology t-number-theory label:t-algebra$	73/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	9	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	alreadydone assignee:alreadydone	39-39310 1 month ago	78-42053 2 months ago	128-27055 128 days
27073	pechersky author:pechersky	feat(Archive/Examples/Local): files showcasing properties of local fields	for p-adics, completions of number fields, laurent series, and fraction rings of witt vectors Should get filled in as more data/instances are declared --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory awaiting-author	139/0	Archive.lean,Archive/Examples/Local/Laurent.lean,Archive/Examples/Local/NumberField.lean,Archive/Examples/Local/Padic.lean,Archive/Examples/Local/Witt.lean	5	6	['faenuccio', 'github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	39-27094 1 month ago	39-27094 1 month ago	79-37394 79 days
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/)	t-ring-theory awaiting-author	19/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean	1	5	['erdOne', 'github-actions', 'pechersky']	nobody	38-54432 1 month ago	39-27124 1 month ago	3-20137 3 days
26985	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define implicitFunOfProdDomain	This PR continues the work from #16743. Original PR: https://github.com/leanprover-community/mathlib4/pull/16743 --- - [x] depends on: #28352 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	107/4	Mathlib/Analysis/Calculus/Implicit.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	38-21713 1 month ago	45-82201 1 month ago	45-83775 45 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/)	t-meta awaiting-author	16/0	Mathlib/Tactic/FunProp.lean	1	5	['Vierkantor', 'github-actions', 'grunweg', 'kckennylau']	alexjbest assignee:alexjbest	37-59480 1 month ago	37-59512 1 month ago	57-63332 57 days
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/)	large-import FLT t-topology	25/0	Mathlib/Topology/Algebra/ContinuousMonoidHom.lean	1	2	['github-actions', 'grunweg']	nobody	37-18044 1 month ago	37-18044 1 month ago	55-15977 55 days
29361	FlAmmmmING author:FlAmmmmING	feat: Catalan generating function as a formal power series	We introduce the Catalan generating function as a formal power series over `ℕ`. ## Main Definitions * `PowerSeries.catalanSeries`: The Catalan generating function as a power series. ## Main Results * `PowerSeries.sum_coeff_X_catalanSeries`: When `n` is a natural number, each term in the sum `coeff i X * catalan (n - i)` is 0 except for `i = 1`. * `PowerSeries.coeff_X_mul_catalanSeries`: The coefficient of `X * catalanSeries` at `X^n` is `catalan (n - 1)` when `n > 0`. * `PowerSeries.catalanSeries_one_add_X_mul_self_sq`: The Catalan generating function satisfies the equation `catalanSeries = 1 + X * catalanSeries ^ 2`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	71/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Catalan.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'wwylele']	kbuzzard assignee:kbuzzard	36-84710 1 month ago	69-80785 2 months ago	69-80811 69 days
26292	RemyDegenne author:RemyDegenne	feat(MeasureTheory): tightness of the range of a sequence	* `isTightMeasureSet_range_iff_tendsto_limsup_measure_norm_gt`: in a proper normed group, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖x‖}) atTop` tends to `0` at infinity. * `isTightMeasureSet_range_iff_tendsto_limsup_inner`: in a finite-dimensional inner product space, the range of a sequence of measures `μ : ℕ → Measure E` is tight if and only if the function `r : ℝ ↦ limsup (fun n ↦ μ n {x \| r < ‖⟪y, x⟫_𝕜‖}) atTop` tends to `0` at infinity for all `y`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24838. Original PR: https://github.com/leanprover-community/mathlib4/pull/24838	t-measure-probability awaiting-author	198/2	Mathlib/MeasureTheory/Measure/TightNormed.lean	1	1	['github-actions']	nobody	36-39178 1 month ago	143-80943 4 months ago	0-1 1 second
30107	grunweg author:grunweg	chore: track occurrences of 'nonrec' as technical debt	Matches leanprover-community/leanprover-community.github.io#689: only merge when that is deemed a good idea. -------- TODO: make the count more robust, for instance count all occurrences of "^nonrec " plus those of "^[private\|protected] nonrec ". --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt CI	1/0	scripts/technical-debt-metrics.sh	1	1	['github-actions']	robertylewis assignee:robertylewis	36-21704 1 month ago	43-80992 1 month ago	43-80967 43 days
30116	FormulaRabbit81 author:FormulaRabbit81	feat(Measure): proof that a relatively compact set of measures is tight	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability	196/2	Mathlib/MeasureTheory/Measure/Tight.lean	1	1	['github-actions']	kex-y assignee:kex-y	36-21704 1 month ago	43-31960 1 month ago	43-31990 43 days
26983	mans0954 author:mans0954	feat(Order/LatticeElements): distributive, standard and neutral elements of a lattice	Defines distributive, standard and neutral elements of a lattice and gives equivalent conditions. --- - [x] depends on: #26836 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order WIP	238/0	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/LatticeElements.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	35-83169 1 month ago	39-47272 1 month ago	0-40786 11 hours
30355	kckennylau author:kckennylau	feat(Logic): graded functions	This PR defines a class of graded functions, called `GradedFunLike`. It is intended to be used in #30312 to characterise a class of graded ring homomorphisms, where it is invoked as `[GradedFunLike F 𝒜 ℬ] [RingHomClass F A B]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	41/0	Mathlib.lean,Mathlib/Data/FunLike/Graded.lean	2	1	['github-actions']	nobody	35-67449 1 month ago	36-21520 1 month ago	36-21554 36 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/)	new-contributor t-combinatorics	391/0	Mathlib.lean,Mathlib/Combinatorics/DiHypergraph/Basic.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	35-21711 1 month ago	57-70711 1 month ago	57-70752 57 days
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/)	t-topology	287/0	Mathlib.lean,Mathlib/Topology/ClusterPt.lean,Mathlib/Topology/Maps/PullbackQuotient.lean	3	1	['github-actions']	nobody	35-19699 1 month ago	35-19898 1 month ago	0-0 0 seconds
29347	themathqueen author:themathqueen	refactor(Algebra/Star/StarAlgHom): let `StarAlgEquiv` extend `StarRingEquiv` instead of `RingEquiv`	Instead of having `StarAlgEquiv` extend `RingEquiv` and have properties `map_star'` and `map_smul'`, it now extends `StarRingEquiv` with only `map_smul'`. --- Will add more API in the next PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	29/36	Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean	2	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'themathqueen']	dupuisf and kbuzzard assignee:dupuisf assignee:kbuzzard	35-14792 1 month ago	68-34628 2 months ago	70-57578 70 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/)	new-contributor t-combinatorics	476/0	Mathlib.lean,Mathlib/Combinatorics/Digraph/Maps.lean	2	1	['github-actions']	awainverse assignee:awainverse	34-21721 1 month ago	50-51644 1 month ago	50-51679 50 days
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/)	t-data awaiting-author	95/0	Mathlib/Data/Nat/Factors.lean	1	11	['b-mehta', 'github-actions', 'grunweg', 'plp127']	b-mehta assignee:b-mehta	32-66934 1 month ago	33-7747 1 month ago	111-15071 111 days
29798	Cyantain author:Cyantain	feat(FieldTheory/IsIntegrallyClosed): lemma to judge whether an element is integral	In this PR, we proved that an element is integral iff it's root of irreducible polynomial with unit leading coeff, which is an easy way to judge an element is integral or not, such as $\sqrt 5 / 4$, because it's root of $16x^2-5$ with not unit leading coeff, so it's not integral.	new-contributor t-algebra delegated awaiting-author label:t-algebra$	13/0	Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean	1	9	['Ruben-VandeVelde', 'adomani', 'github-actions', 'kckennylau', 'mathlib-bors', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	31-80453 1 month ago	31-80453 1 month ago	6-29891 6 days
26561	b-mehta author:b-mehta	feat(LiminfLimsup): liminf of an antitone function is its supremum	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #26560	t-topology help-wanted	24/0	Mathlib/Topology/Order/LiminfLimsup.lean	1	4	['b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	31-9392 1 month ago	31-9471 1 month ago	0-6 6 seconds
27254	yuanyi-350 author:yuanyi-350	2025 imo problem3	- [x] depends on: #28788 - [x] depends on: #28790 - [x] depends on: #28829 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	231/0	Archive.lean,Archive/Imo/Imo2025Q3.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean	3	28	['github-actions', 'jsm28', 'kbuzzard', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen', 'wwylele', 'yuanyi-350']	jsm28 assignee:jsm28	30-79261 30 days ago	72-23803 2 months ago	105-85062 105 days
26961	mariainesdff author:mariainesdff	feat(RingTheory/PowerSeries/Substitution): add API	Co-authored-by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	57/5	Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	2	13	['Ruben-VandeVelde', 'github-actions', 'mariainesdff', 'mattrobball']	mattrobball assignee:mattrobball	30-75923 30 days ago	56-70583 1 month ago	104-4199 104 days
28970	Whysoserioushah author:Whysoserioushah	feat(Algebra/Algebra/ReducedNorm) : Defines reduced norm and trace	TODO : 1. add the theorem proving reduced charpoly is independent from the choice of AlgEquiv (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Algebra.2ETensorProduct.2Eassoc/with/536349758)) 2. prove reduced charpoly is "actually" in the polynomial ring of base field (blocked by this [discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.9C.94.20Refactor.20Subfield)) therefore content about this topic is basically the best I could do for now :-( --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	66/0	Mathlib.lean,Mathlib/Algebra/Algebra/ReducedNorm.lean	2	18	['Whysoserioushah', 'chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'kbuzzard']	chrisflav assignee:chrisflav	30-64587 30 days ago	38-46963 1 month ago	41-8846 41 days
30333	paulorauber author:paulorauber	feat(Probability): definition of trajMeasure	A definition of `trajMeasure` and some basic lemmas. In the context of the Ionescu-Tulcea theorem, `trajMeasure μ₀ κ` corresponds to the distribution of the trajectory obtained by starting with the distribution `μ₀` and then iterating the kernels `κ`. Lemmas `partialTraj_compProd_kernel_eq_traj_map` and `traj_map_eq_kernel` are attributable to @EtienneC30 and some definitions borrow code from @RemyDegenne , who also improved the code considerably. Please let me know if you would like to be co-authors in this pull request. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	78/1	Mathlib/Probability/Kernel/IonescuTulcea/Traj.lean	1	11	['EtienneC30', 'RemyDegenne', 'github-actions']	EtienneC30 assignee:EtienneC30	29-50326 29 days ago	30-56511 30 days ago	5-85924 5 days
27422	vihdzp author:vihdzp	feat: relate images to pointwise negation/inverses	These lemmas kept coming up in the CGT repo. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra awaiting-author label:t-algebra$	10/0	Mathlib/Algebra/Group/Pointwise/Set/Basic.lean	1	9	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	29-22432 29 days ago	29-23222 29 days ago	4-29607 4 days
30233	Komyyy author:Komyyy	refactor(Topology/Sequences): generalize seq-compactness lemmas to metrizable space	* [`IsSeqCompact.isCompact`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#IsSeqCompact.isCompact) * [`UniformSpace.isCompact_iff_isSeqCompact`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#UniformSpace.isCompact_iff_isSeqCompact) * [`UniformSpace.compactSpace_iff_seqCompactSpace`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Sequences.html#UniformSpace.compactSpace_iff_seqCompactSpace) These are lemmas on uniform spaces which has countable uniformity, so can be generalized to pseudo-metrizable space. From [CLT](https://github.com/RemyDegenne/CLT) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology	20/7	Mathlib/Topology/Sequences.lean,docs/overview.yaml,docs/undergrad.yaml	3	1	['github-actions']	grunweg assignee:grunweg	29-21700 29 days ago	36-76154 1 month ago	36-76626 36 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/)	t-data awaiting-author	19/0	Mathlib/Data/Fintype/Quotient.lean	1	12	['github-actions', 'kckennylau', 'pechersky', 'tristan-f-r', 'vihdzp']	pechersky assignee:pechersky	29-7799 29 days ago	29-7799 29 days ago	88-10285 88 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/)	t-order awaiting-author	32/4	Mathlib/Order/Hom/WithTopBot.lean,Mathlib/Order/WithBot.lean	2	4	['JovanGerb', 'YaelDillies', 'github-actions']	YaelDillies assignee:YaelDillies	28-61842 28 days ago	30-78380 30 days ago	12-3204 12 days
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 ```	t-meta WIP	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	28-54193 28 days ago	66-68026 2 months ago	0-11559 3 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 easy delegated	17/7	Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Data/Finset/Sort.lean	2	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ocfnash']	nobody	28-41424 28 days ago	49-73514 1 month ago	3-79002 3 days
30003	vlad902 author:vlad902	feat(Order): helper lemmas for `IsChain`/`IsAntichain`	These were useful in formalizing Dilworth's theorem. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	23/2	Mathlib/Order/Antichain.lean,Mathlib/Order/Preorder/Chain.lean	2	23	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'vlad902']	YaelDillies assignee:YaelDillies	28-34973 28 days ago	30-46401 30 days ago	48-13387 48 days
28604	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes (minimally invasive version)	Add the missing `NonAssocComm(Semi)ring` classes and add some missing instances between existing classes. Contrary to #28532, the approach here doesn't add any new `extends`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	59/17	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean	3	21	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	27-54965 27 days ago	43-25907 1 month ago	43-84920 43 days
29634	YaelDillies author:YaelDillies	feat: missing instance `NonUnitalCommSemiring R → NonUnitalNonAssocCommSemiring R`	For some reason, this causes elaboration issues. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI help-wanted label:t-algebra$	16/7	Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/Tactic/Ring/Basic.lean	4	7	['YaelDillies', 'alreadydone', 'github-actions', 'riccardobrasca']	nobody	27-54489 27 days ago	60-76706 1 month ago	0-19 19 seconds
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		159/104	Mathlib/Data/Fin/Tuple/Basic.lean	1	7	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	27-52112 27 days ago	45-48953 1 month ago	47-18454 47 days
28141	YaelDillies author:YaelDillies	chore: deprecate `BialgHom.coe_toLinearMap`	`BialgHom.toLinearMap` is a fake projection. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	5/11	Mathlib/RingTheory/Bialgebra/Hom.lean	1	8	['YaelDillies', 'eric-wieser', 'github-actions']	alreadydone assignee:alreadydone	27-32796 27 days ago	27-32796 27 days ago	96-85207 96 days
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/)		208/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/Resultant/Quadratic.lean	2	3	['JovanGerb', 'github-actions', 'mathlib4-dependent-issues-bot']	JovanGerb assignee:JovanGerb	26-69844 26 days ago	36-41385 1 month ago	36-45264 36 days
22771	alreadydone author:alreadydone	feat(Homotopy/Lifting): monodromy of covering maps and lifting criterion	Define the monodromy of a covering map: given a path in the base space, lifting it through the covering map induces a bijection between the fibers at the two endpoints of the path. Definition 2.1 in https://ncatlab.org/nlab/show/monodromy. --- - [ ] depends on: #28234 - [x] depends on: #22649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	193/146	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Product.lean	9	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	26-37765 26 days ago	82-70426 2 months ago	144-35711 144 days
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.	t-topology awaiting-author	6/1	Mathlib/Topology/Algebra/Module/ModuleTopology.lean	1	7	['github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-bot', 'ocfnash']	ocfnash assignee:ocfnash	26-35371 26 days ago	46-60354 1 month ago	25-3547 25 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/)	t-analysis awaiting-author	32/0	Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean	1	8	['Julian', 'Paul-Lez', 'eric-wieser', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	26-33841 26 days ago	51-47061 1 month ago	15-76317 15 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/)	t-algebraic-geometry	66/0	Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean	1	1	['github-actions']	alexjbest assignee:alexjbest	26-21669 26 days ago	33-80614 1 month ago	33-80644 33 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/)	large-import t-algebra label:t-algebra$	11/0	Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean	1	4	['github-actions', 'llllvvuu', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-1520 26 days ago	26-2085 26 days ago	0-0 0 seconds
29706	kim-em author:kim-em	feat: add piCongrSigmaFiber and piCongrFiberwise equivalences	## Summary Add two new equivalence functions for working with fibers and sigma types: - `Equiv.piCongrSigmaFiber`: transforms between functions on sigma fibers and regular pi types - `Equiv.piCongrFiberwise`: lifts fiber-wise equivalences to product equivalences These functions are from the FLT (Fermat's Last Theorem) project and are useful for manipulating dependent function types indexed by fibers of a function. ## Details The new definitions allow for elegant transformations between: 1. Functions defined on sigma types representing fibers of a function 2. Regular dependent functions These are particularly useful in algebraic contexts where one needs to work with products indexed by fibers. ## Context This PR was prepared by Claude (Claude Code) based on the following prompt: > "Please read FLT/Mathlib/Logic/Equiv/Basic.lean, and also the corresponding file in the Mathlib repository. Please prepare a PR to Mathlib containing this content, putting it at an appropriate point in the corresponding Mathlib file. Make sure the PR is label FLT, and write in the PR comment an explanation that the PR was prepared by Claude, including quoting the prompting." The content is sourced from `/Users/kim/projects/lean/FLT/FLT/Mathlib/Logic/Equiv/Basic.lean` in the FLT project repository. 🤖 Generated with [Claude Code](https://claude.ai/code)	FLT t-logic	39/0	Mathlib/Logic/Equiv/Basic.lean	1	5	['Ruben-VandeVelde', 'github-actions', 'kim-em']	fpvandoorn assignee:fpvandoorn	25-26463 25 days ago	58-63442 1 month ago	58-79645 58 days
29969	smmercuri author:smmercuri	refactor: use isometry extensions for completions at infinite places of number fields	The API for `InfinitePlace.Completion` currently makes use of abstract results defined on absolute values, which all depend on the hypothesis of the form `∀ x, ‖f x‖ = v x`. This is equivalent to `f` being an isometry, and so many of these results can be bypassed and deprecated by using `Isometry.completion_extension` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		73/48	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/Topology/MetricSpace/Completion.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	24-83875 24 days ago	24-84137 24 days ago	48-20598 48 days
30711	kim-em author:kim-em	experiment: which `omega` can not be replaced with `grind`?			1/0	lakefile.lean	1	1	['github-actions']	nobody	24-76402 24 days ago	24-76474 24 days ago	0-0 0 seconds
30712	kim-em author:kim-em	experiment: which `linarith` can not be replaced with `grind`?			1/0	lakefile.lean	1	1	['github-actions']	nobody	24-76397 24 days ago	24-76461 24 days ago	0-0 0 seconds
30720	kim-em author:kim-em	experiment: merge with subsequent grind			1/0	lakefile.lean	1	1	['github-actions']	nobody	24-73783 24 days ago	24-73858 24 days ago	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/)	t-group-theory new-contributor awaiting-author	6/0	Mathlib/GroupTheory/GroupAction/CardCommute.lean	1	17	['github-actions', 'kckennylau', 'plp127', 'tb65536']	tb65536 assignee:tb65536	24-60306 24 days ago	24-60306 24 days ago	8-8414 8 days
29362	stepanholub author:stepanholub	feat:(Data/List) add the notion of period of List and prove the Periodicity Lemma	Add the concept of the period of a List (word, sequence) which is missing, and prove its basic nontrivial property describing under which conditions list can have two periods known as the Periodicity Lemma (aka Fine-Wilf Theorem). ---	t-data new-contributor	227/0	Mathlib.lean,Mathlib/Data/List/PeriodicityLemma.lean	2	125	['Ruben-VandeVelde', 'Timeroot', 'fpvandoorn', 'github-actions', 'madvorak', 'plp127', 'stepanholub', 'wwylele']	pechersky assignee:pechersky	24-21700 24 days ago	50-43156 1 month ago	68-39349 68 days
30344	Deep0Thinking author:Deep0Thinking	feat(MeasureTheory/Integral): add versions of `exists_eq_interval_average` and first mean value theorem for integrals	Add the First mean value theorem for (unordered) interval integrals on ℝ. - `exists_eq_const_mul_interval_integral_of_continuous_on_of_ae_nonneg` - `exists_eq_const_mul_interval_integral_of_continuous_on_of_nonneg` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	290/41	Mathlib.lean,Mathlib/MeasureTheory/Integral/IntervalAverage.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/MeanValue.lean	3	9	['Deep0Thinking', 'github-actions', 'plp127']	RemyDegenne assignee:RemyDegenne	24-17641 24 days ago	36-39066 1 month ago	36-39095 36 days
27703	vihdzp author:vihdzp	feat: `le_of_forall_ne` et. al	--- This form of `le_of_forall_lt` is a bit nicer when working with nimbers; they're minimum excludents, so to prove `a ≤ b` you have to prove `b` can't be equal to any smaller `a`! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	30/0	Mathlib/Order/Basic.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'pechersky', 'vihdzp']	pechersky assignee:pechersky	24-10512 24 days ago	24-10512 24 days ago	12-17525 12 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 t-category-theory delegated	182/2	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	1	6	['github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	23-61094 23 days ago	24-52810 24 days ago	0-22513 6 hours
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/)	new-contributor t-category-theory awaiting-author	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	16	['fweth', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	joelriou assignee:joelriou	23-58679 23 days ago	23-58679 23 days ago	62-83085 62 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/)	t-ring-theory FLT awaiting-author	16/0	Mathlib/RingTheory/TwoSidedIdeal/Operations.lean	1	2	['erdOne', 'github-actions']	erdOne assignee:erdOne	23-31600 23 days ago	23-31600 23 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/)	new-contributor t-combinatorics awaiting-author	16/0	Mathlib/Combinatorics/SimpleGraph/Trails.lean	1	6	['IvanRenison', 'github-actions', 'vlad902']	kmill assignee:kmill	23-23838 23 days ago	23-23838 23 days ago	148-3717 148 days
27307	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	This PR continues the work from #22279. Original PR: https://github.com/leanprover-community/mathlib4/pull/22279	t-ring-theory	391/0	Mathlib.lean,Mathlib/Algebra/Algebra/Equiv.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	9	9	['chrisflav', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	mattrobball assignee:mattrobball	22-82973 22 days ago	101-48096 3 months ago	116-59407 116 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`. Additionally, I need `equivSigmaToSet` (in `Data/Setoid/Basic`) to prove things about `SimpleGraph.ConnectedComponent`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	179/0	Mathlib/Data/Quot.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/Setoid/Basic.lean	4	2	['eric-wieser', 'github-actions']	nobody	22-76643 22 days ago	23-66136 23 days ago	23-66175 23 days
30746	jeremypparker author:jeremypparker	feat(Data/EReal): toReal_pos	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor easy	4/0	Mathlib/Data/EReal/Basic.lean	1	2	['github-actions', 'jeremypparker']	nobody	22-66944 22 days ago	23-74945 23 days ago	23-74982 23 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 new-contributor awaiting-author	1310/0	Archive.lean,Archive/Imo/Imo2025Q1.lean	2	8	['github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'zhuyizheng']	dwrensha assignee:dwrensha	22-59648 22 days ago	23-24352 23 days ago	65-5080 65 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 = ⊤`.	t-category-theory awaiting-author	48/2	Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean	1	1	['github-actions']	nobody	22-56074 22 days ago	22-56074 22 days ago	98-12071 98 days
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/)	toric t-algebra WIP label:t-algebra$	3/3	Mathlib/Algebra/Polynomial/Bivariate.lean	1	7	['YaelDillies', 'alreadydone', 'github-actions', 'kckennylau']	nobody	22-49627 22 days ago	105-338 3 months ago	15-75841 15 days
30526	SnirBroshi author:SnirBroshi	chore(Logic/Relation): use `Subrelation` to state theorems	chore(Logic/Relation): replace every `∀ x y, r x y → r' x y` with `Subrelation r r'` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip	79/73	Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/Logic/Relation.lean,Mathlib/Order/Interval/Finset/Basic.lean	7	4	['SnirBroshi', 'github-actions', 'thorimur', 'vihdzp']	thorimur assignee:thorimur	22-22221 22 days ago	22-22254 22 days ago	8-76821 8 days
30259	erdOne author:erdOne	feat(Valuation): uniformizer of discrete valuation	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	31/0	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean	1	2	['github-actions', 'pechersky']	alreadydone assignee:alreadydone	22-21694 22 days ago	39-24398 1 month ago	39-24433 39 days
30336	kckennylau author:kckennylau	feat(RingTheory): some lemmas about the irrelevant ideal	This PR adds some lemmas about the irrelevant ideal of a graded ring, such as the fact that it is the iSup of each positively graded component. --- Split from #26061. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	49/5	Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean	1	1	['github-actions']	mattrobball assignee:mattrobball	22-21692 22 days ago	36-53993 1 month ago	36-54026 36 days
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	138/1	Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean	2	1	['github-actions']	PatrickMassot assignee:PatrickMassot	22-21687 22 days ago	29-61096 29 days ago	29-61133 29 days
23835	chrisflav author:chrisflav	feat(Topology): cardinality of connected components is bounded by cardinality of fiber	We show that if `f : X → Y` is an open and closed map to `Y` and `Y` is connected, the number of connected components of `X` is bounded by the cardinality of the fiber of any point. In particular, if `Y` has finitely many connected components and `f` finite fibers, also `X` as finitely many connected components. From Pi1. --- - [x] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	241/1	Mathlib.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/SetTheory/Cardinal/Finite.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/CardComponents.lean,Mathlib/Topology/Connected/Clopen.lean	6	10	['chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	grunweg assignee:grunweg	21-78359 21 days ago	22-56888 22 days ago	67-2437 67 days
30547	mariainesdff author:mariainesdff	feat(Algebra/Polynomial/AlgebraMap): add Polynomial.mapAlgHom lemmas	Co-authored by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	35/0	Mathlib/Algebra/Polynomial/AlgebraMap.lean	1	n/a	['erdOne', 'github-actions', 'mariainesdff']	nobody	21-75985 21 days ago	unknown	unknown
26332	Timeroot author:Timeroot	feat(ModelTheory/Definability): TermDefinable functions	This PR continues the work from #23506. Original PR: https://github.com/leanprover-community/mathlib4/pull/23506	t-logic	145/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,scripts/noshake.json	3	29	['Timeroot', 'github-actions', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	21-75164 21 days ago	21-75164 21 days ago	140-77895 140 days
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	161/166	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/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/RingTheory/Valuation/Basic.lean	13	13	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'urkud']	Vierkantor assignee:Vierkantor	21-66190 21 days ago	92-39313 3 months ago	0-17 17 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	t-linter please-adopt	387/19	Mathlib/Tactic/Linter/DirectoryDependency.lean,scripts/README.md,scripts/forbiddenDirs.json	3	4	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	21-66038 21 days ago	21-66071 21 days ago	126-49390 126 days
26129	LessnessRandomness author:LessnessRandomness	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality for angles	This PR continues the work from #24206. Original PR: https://github.com/leanprover-community/mathlib4/pull/24206	new-contributor t-euclidean-geometry	202/15	Mathlib.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean	8	85	['JovanGerb', 'LessnessRandomness', 'Timeroot', 'github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'themathqueen']	jsm28 assignee:jsm28	21-64439 21 days ago	24-50688 24 days ago	145-33260 145 days
29995	vihdzp author:vihdzp	feat: more lemmas on `Concept`	These are used in the [`combinatorial-games`](https://github.com/vihdzp/combinatorial-games) repository. Note that `Concept α α (· ≤ ·)` is the Dedekind-McNeille completion, while `Concept α α (· < ·)` is a modified form of it that's used to define surreal cuts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	28/0	Mathlib/Order/Concept.lean	1	28	['YaelDillies', 'github-actions', 'linesthatinterlace', 'vihdzp']	YaelDillies assignee:YaelDillies	21-60710 21 days ago	32-6645 1 month ago	13-9725 13 days
30821	chriseth author:chriseth	fix(Computability/Tape): introduce write-simplification theorem that uses `ListBlank.mk`	Add a simplification theorem which is a version of `Tape.write_mk'` that solves a simplification dead-end: If we have an expression of the form `(Tape.mk' L (ListBlank.cons a (ListBlank.mk R))).write b`, the theorem `Tape.write_mk'` would be applicable, but lean instead uses `ListBlank.cons_mk`, which turns it into `(Tape.mk' L (ListBlank.mk (a :: R))).write b` and makes `Tape.write_mk` no longer applicable because it requires `ListBlank.cons a R`, reaching a dead-end. This PR adds an equivalent theorem whose LHS allows `ListBlank.mk (a :: R)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	7/0	Mathlib/Computability/Tape.lean	1	1	['github-actions']	nobody	21-58469 21 days ago	21-58478 21 days ago	21-58517 21 days
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/)	t-differential-geometry WIP	57/9	Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean	1	2	['github-actions', 'grunweg']	nobody	21-52403 21 days ago	21-54204 21 days ago	0-6 6 seconds
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	21-47270 21 days ago	21-47349 21 days ago	21-47394 21 days
29422	jsm28 author:jsm28	fix(Data/Finset/Max): Use `DecidableEq` for `insert` lemmas	These `insert` in these lemma statements uses a `DecidableEq` instance derived from `LinearOrder`; make them syntactically more general by passing in a `DecidableEq` instance separately. (Some `insert` lemmas in this file already take `DecidableEq` hypotheses.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	8/8	Mathlib/Data/Finset/Max.lean	1	2	['eric-wieser', 'github-actions']	pechersky assignee:pechersky	21-21717 21 days ago	67-19662 2 months ago	67-19635 67 days
29437	SnirBroshi author:SnirBroshi	feat(Data/Seq): add Seq.subsequence and prove basic theorems about it	I added `Seq.subsequence` to compose a sequence with a monotone function, creating a subsequence. Aliased to `Seq.comp` since it's a composition. I also added `Nat.le_induction_step_iff` which is needed to prove a subsequence is a sequence. This proves the comment at the top of `Defs.lean` that says "if `f n = none`, then `f m = none` for all `m ≥ n`" while `IsSeq` only talks about `n+1`. For completion I added the same statement for `Int`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	104/0	Mathlib/Data/Int/Init.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Seq/Defs.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	pechersky assignee:pechersky	21-21717 21 days ago	57-68920 1 month ago	66-56405 66 days
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	1	['github-actions']	nobody	21-1315 21 days ago	50-21670 1 month ago	0-0 0 seconds
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/)	awaiting-author	20/0	Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean	2	2	['github-actions', 'jcommelin']	jcommelin assignee:jcommelin	20-62327 20 days ago	20-62327 20 days ago	46-58434 46 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/)	t-data	35/0	Mathlib/Data/Multiset/Fintype.lean	1	8	['Ruben-VandeVelde', 'github-actions', 'llllvvuu', 'vihdzp', 'wwylele']	pechersky assignee:pechersky	20-21708 20 days ago	64-20114 2 months ago	64-20103 64 days
29982	hrmacbeth author:hrmacbeth	feat: new `isolate` tactic	This PR adds a new tactic, `isolate`, which "solves for x" in an equation or relation. For example: ```lean example (a b : ℝ) (f : ℝ → ℝ) : 5 * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / 5` ``` The `isolate` tactic may generate side goals, if these are necessary to justify the transformation. The tactic will attempt to justify such side goals using `positivity` (as in the above example), unification, or type class inference, but if unsuccessful will present them to the user. For example: ```lean example (a b c : ℝ) (f : ℝ → ℝ) : c * f a - 3 < b := by isolate f a -- new goal: `⊢ f a < (b + 3) / c` -- second (side) new goal: `⊢ 0 < c` ``` The `isolate` tactic is extensible. Coverage may be extended to new relations and new operations-to-be-undone by tagging appropriate lemmas with the new `@[isolate]` attribute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	863/3	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	24	['JovanGerb', 'PatrickMassot', 'github-actions', 'hrmacbeth', 'kim-em']	JovanGerb assignee:JovanGerb	20-5773 20 days ago	48-33858 1 month ago	48-33837 48 days
30668	astrainfinita author:astrainfinita	feat: `QuotLike`	This typeclass is primarily for use by type synonyms of `Quot` and `Quotient`. Using `QuotLike` 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. - Maybe `QuotLike` isn't the appropriate name. It may suggest that this typeclass is similar to `FunLike` and `SetLike`, but it is not. [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	t-data awaiting-zulip RFC awaiting-author	743/0	Mathlib.lean,Mathlib/Data/QuotLike.lean,MathlibTest/QuotLike.lean	3	14	['YaelDillies', 'astrainfinita', 'github-actions', 'vihdzp']	nobody	19-83057 19 days ago	19-83057 19 days ago	0-81 1 minute
29921	mans0954 author:mans0954	refactor(RingTheory/Polynomial/SmallDegreeVieta) : Convert to {p : R[X]} (hp : p.natDegree = 2)	Convert `RingTheory/Polynomial/SmallDegreeVieta` from `{a b c : R} (C a * X ^ 2 + C b * X + C c)` to `{p : R[X]} (hp : p.natDegree = 2)` (see [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/discriminants.20of.20low.20degree.20polynomials/with/538010519)) --- - [x] depends on: #29981 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	75/60	Mathlib/RingTheory/Polynomial/SmallDegreeVieta.lean	1	14	['JovanGerb', 'chrisflav', 'github-actions', 'kckennylau', 'mans0954', 'mathlib4-dependent-issues-bot', 'vihdzp']	erdOne assignee:erdOne	19-72572 19 days ago	19-72572 19 days ago	17-62236 17 days
30902	adomani author:adomani	chore: longLine warnings happen starting at the 101st character	Right now, the longLine linter warning spans the whole line. This PR changes the behaviour and the warning only covers the characters exceeding the 100 character limit. Previous discussion: [#general > error lens in lean4 @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/error.20lens.20in.20lean4/near/547074537) Specific thread: [#mathlib4 > Restrict longLine warning to exceeding characters @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Restrict.20longLine.20warning.20to.20exceeding.20characters/near/547081669) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-linter	1/1	Mathlib/Tactic/Linter/Style.lean	1	1	['github-actions']	nobody	19-36999 19 days ago	19-37256 19 days ago	0-132 2 minutes
30904	vihdzp author:vihdzp	chore: golf `Finsupp.single` lemmas	In particular, we make the coercion `⇑(single a b) = Pi.single a b` a `simp` lemma. --- - [ ] depends on: #30905 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	21/31	Mathlib/Data/Finsupp/Single.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	19-28819 19 days ago	19-28821 19 days ago	0-0 0 seconds
30882	themathqueen author:themathqueen	feat(Data/Nat/Fib): the Cassini and Catalan identities	The [Cassini and Catalan identities](https://en.wikipedia.org/wiki/Cassini_and_Catalan_identities) are identities for the Fibonacci numbers. * Cassini's identity: `fib (n + 1) * fib (n - 1) - fib n ^ 2 = (-1) ^ n` for nonzero `n`. * Catalan's identity: `fib (x + a) ^ 2 - fib (x + 2 * a) * fib x = fib a ^ 2 * (-1) ^ x` for nonzero `x` and `a`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	93/0	Mathlib.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Nat/Fib/Lemmas.lean	3	13	['github-actions', 'themathqueen', 'vihdzp']	nobody	19-27879 19 days ago	19-31284 19 days ago	19-32004 19 days
30436	wwylele author:wwylele	feat(Topology/InfiniteSum): tprod_one_{add/sub}_ordered	This extends the existing `Finset.prod_one_sub_ordered` to infinite sum/product, and also adds the more natural `add` version. Together with some previous PRs about infinite sum/prod and powerseries, this is part of my effort of upstreaming useful stuff from https://github.com/wwylele/PentagonalNumberTheorem. It starts getting into niche lemma, so suggestions such that not wanting this in mathlib, or it should be stated in a different form, are all welcomed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	44/0	Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean	2	1	['github-actions']	grunweg assignee:grunweg	19-21697 19 days ago	26-46746 26 days ago	33-66467 33 days
30831	chrisflav author:chrisflav	feat(AlgebraicGeometry): the fpqc topology	We define the fpqc topology on the category of schemes as the intersection of the quasi-compact topology with the flat topology. From Proetale. --- - [x] depends on: #30835 - [x] depends on: #30906 - [ ] depends on: #30910 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry WIP	524/1	Mathlib.lean,Mathlib/AlgebraicGeometry/Cover/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicGeometry/Morphisms/UnderlyingMap.lean,Mathlib/AlgebraicGeometry/Sites/MorphismProperty.lean,Mathlib/AlgebraicGeometry/Sites/QuasiCompact.lean,Mathlib/CategoryTheory/Sites/Hypercover/ZeroFamily.lean,Mathlib/Topology/Sets/CompactOpenCovered.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	18-82756 18 days ago	18-82758 18 days ago	0-7 7 seconds
26986	WangYiran01 author:WangYiran01	feat(Partition): add bijection for partitions with max part ≤ r	## Summary 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. ## Implementation notes - The proof uses `Multiset.erase` and `Multiset.cons` with basic properties of `sum`, `sup`, and `Partition` structures. - The bijection is implemented explicitly via `f` and `g`, and proven mutually inverse via `Subtype.ext`. ## Linting - [x] Passes `lake build` - [x] Linter clean (no commandStart or longLine issues) ## Author Contributed by Yiran Wang.	new-contributor t-combinatorics awaiting-author	26/0	Mathlib/Combinatorics/Enumerative/Partition.lean	1	6	['WangYiran01', 'github-actions', 'kckennylau', 'kim-em']	b-mehta assignee:b-mehta	18-78534 18 days ago	23-25249 23 days ago	102-52887 102 days
25603	callesonne author:callesonne	feat(Bicategory/InducedBicategory): add induced bicategories	This PR adds a way of inducing a full bicategory structure on given type of objects with a map to the objects of some bicategory (i.e. with all 1-morphisms and all 2-morphisms). I have not tried to implement "locally induced bicategories" which should allow for a sub-class of 1-morphisms as well. This is because copying the naive approach and replacing the map `F` as for induced categories with a functor, one runs into issues when the equalities in `F.map_comp` and `F.map_id` are not defeq equalities. One could probably define locally full sub-bicategories using a pair of `ObjectProperty` + `MorphismProperty` to ensure that the inclusions are actually defeq, but I did not want to get into this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	68/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean	2	6	['callesonne', 'github-actions', 'robin-carlier']	robin-carlier assignee:robin-carlier	18-70143 18 days ago	144-80323 4 months ago	13-48345 13 days
30914	eric-wieser author:eric-wieser	feat(Data/Set/NAry): lemmas for `diff`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-order delegated	10/0	Mathlib/Data/Set/NAry.lean	1	2	['github-actions', 'grunweg', 'mathlib-bors']	nobody	18-51182 18 days ago	18-51182 18 days ago	0-56942 15 hours
26464	joelriou author:joelriou	feat(LinearAlgebra): generators of pi tensor products	In this PR, we show that the `R`-module `⨂[R] i, M i` is finitely generated if the index type is finite and all `M i` are finitely generated. This follows from a more precise result about generators of `⨂[R] i, M i`. --- This PR continues the work from #18725. Original PR: https://github.com/leanprover-community/mathlib4/pull/18725	file-removed t-algebra awaiting-author label:t-algebra$	270/5	Mathlib.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/SubtypeNeLift.lean,Mathlib/LinearAlgebra/PiTensorProduct/Basic.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	10	29	['eric-wieser', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	mattrobball assignee:mattrobball	18-37488 18 days ago	23-55727 23 days ago	97-36349 97 days
30942	EmilieUthaiwat author:EmilieUthaiwat	WIP (kaplanskySet)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	31/0	Mathlib.lean,Mathlib/RingTheory/Ideal/kaplanskySet.lean	2	1	['github-actions']	nobody	18-34327 18 days ago	18-41895 18 days ago	0-0 0 seconds
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/)	large-import t-algebra label:t-algebra$	41/13	Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Data/PNat/Defs.lean	3	2	['github-actions', 'yury-harmonic']	nobody	17-62253 17 days ago	81-43724 2 months ago	81-43758 81 days
30330	Bergschaf author:Bergschaf	feat(Algebra/Group/Action/Equidecomp): Mathlib's definition of Equidecomposability is equivalent to the standart one using partitions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	329/1	Mathlib/Algebra/Group/Action/Equidecomp.lean	1	5	['Bergschaf', 'Felix-Weilacher', 'github-actions']	Vierkantor assignee:Vierkantor	17-59605 17 days ago	17-59605 17 days ago	0-0 0 seconds
29735	vihdzp author:vihdzp	feat: order instances on quotients	We define a `Preorder (Quotient s)` instance in the natural way, and prove that it can be strengthened to a `LinearOrder` when all equivalence classes are `OrdConnected`. --- See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Quotient.20of.20linear.20order.20is.20linear.20order/near/539915988) for some long-winded discussion about this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	126/0	Mathlib.lean,Mathlib/Order/Quotient.lean	2	3	['github-actions', 'plp127']	bryangingechen assignee:bryangingechen	17-59582 17 days ago	58-5950 1 month ago	58-5980 58 days
30121	idontgetoutmuch author:idontgetoutmuch	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/)	new-contributor t-differential-geometry awaiting-author	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	5	['github-actions', 'grunweg']	hrmacbeth assignee:hrmacbeth	17-55765 17 days ago	17-55765 17 days ago	25-22983 25 days
27946	plp127 author:plp127	refactor: have `MetrizableSpace` not depend on `MetricSpace`	Some theorems for uniform spaces with a countably generated uniformity do not mention their uniformity in any of the hypotheses or the conclusion (for example `UniformSpace.isCompact_iff_isSeqCompact`). This PR allows those theorems to be stated for (pseudo)metrizable spaces without importing the real numbers. - Use `TopologicalSpace.pseudoMetrizableSpaceUniformity` to endow a pseudometrizable space with a compatible uniformity, and use `TopologicalSpace.pseudoMetrizableSpaceUniformity_countably_generated` to show that this is countably generated. - `TopologicalSpace.pseudoMetrizableSpacePseudoMetric` and `TopologicalSpace.metrizableSpaceMetric` have been moved to `Mathlib/Topology/Metrizable/Uniformity.lean`. See also #2032 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	128/102	Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Topology/Compactness/PseudometrizableLindelof.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/ContinuousMap.lean,Mathlib/Topology/Metrizable/Real.lean,Mathlib/Topology/Metrizable/Uniformity.lean	7	15	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127', 'urkud', 'vihdzp']	urkud assignee:urkud	17-55593 17 days ago	32-54823 1 month ago	101-41842 101 days
30293	vlad902 author:vlad902	feat(SimpleGraph): there exists a maximal path/trail in a graph with finite edges	Inspired by [this Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Help.20me.20learn.20good.20style.3A.20IsTree/near/543395218) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	27/1	Mathlib/Combinatorics/SimpleGraph/Paths.lean	1	2	['github-actions', 'vlad902']	awainverse assignee:awainverse	17-21714 17 days ago	37-77288 1 month ago	37-77317 37 days
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra. --- - [x] depends on: #30806	new-contributor	223/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	7	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	TwoFX assignee:TwoFX	17-10624 17 days ago	17-13895 17 days ago	44-82270 44 days
29539	YaelDillies author:YaelDillies	feat: monoid algebras are invariant under base change	From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric large-import	112/6	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean	3	6	['YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	mattrobball assignee:mattrobball	16-84137 16 days ago	16-84159 16 days ago	63-35701 63 days
30892	vihdzp author:vihdzp	feat: head/last element of flattened list	--- Split off from #16837. `Mathlib.Data.List.Induction` is not a heavy import by any sense of the word. The huge import jump seems to be artifact from the fact the file was previously importing only very minimal stuff from core. (In fact, the other theorems on the file are arguably good upstreaming candidates). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data awaiting-author	12/2	Mathlib/Data/List/Flatten.lean	1	3	['YaelDillies', 'github-actions']	nobody	16-83089 16 days ago	16-83089 16 days ago	2-50226 2 days
29186	winstonyin author:winstonyin	feat: IsIntegralCurve for solutions to ODEs	I define `IsIntegralCurve` etc. for solutions to ODEs on vector spaces. The translation and scaling lemmas are also included. This parallels `IsMIntegralCurve` etc. for manifolds. Moved from #26534. - [x] depends on: #26563 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis t-differential-geometry	298/100	Mathlib.lean,Mathlib/Analysis/ODE/Basic.lean,Mathlib/Analysis/ODE/Transform.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/Transform.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	grunweg and sgouezel assignee:grunweg assignee:sgouezel	16-82190 16 days ago	74-41552 2 months ago	74-41685 74 days
25856	MichaelStollBayreuth author:MichaelStollBayreuth	perf(Data.Real.Sqrt): make Real.sqrt irreducible	We try to see what happens if we make Real.sqrt irreducible. There are cases where this makes unification very significantly faster, compare [#mathlib4 > Coercion triggers timeout @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Coercion.20triggers.20timeout/near/517177117). (Migrated manually from #24752) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	migrated-from-branch t-data	7/5	Mathlib/Data/Real/Sqrt.lean	1	6	['MichaelStollBayreuth', 'github-actions', 'j-loreaux', 'leanprover-bot']	ericrbg assignee:ericrbg	16-68924 16 days ago	74-40567 2 months ago	143-67153 143 days
30378	mans0954 author:mans0954	refactor(Order/Hom/Lattice): Use default `initialize_simps_projections` configuration for `LatticeHom`.	Use default `initialize_simps_projections` configuration for `LatticeHom`. I'm not sure what was originally intended by the TODO, but this appears to work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	4/7	Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Hom/WithTopBot.lean	2	3	['bryangingechen', 'fpvandoorn', 'github-actions']	bryangingechen assignee:bryangingechen	16-66696 16 days ago	17-40560 17 days ago	18-11603 18 days
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/)	t-measure-probability WIP	295/124	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	1	['github-actions']	nobody	16-61371 16 days ago	16-61443 16 days ago	0-2 2 seconds
30667	FrederickPu author:FrederickPu	Subgroup mul	Title: Algebra: pointwise products for subgroups Description: showed the point-wise product of disjoint subgroups is equivalent to their Cartesian product --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	47/0	Mathlib/Algebra/Group/Subgroup/Pointwise.lean	1	10	['FrederickPu', 'eric-wieser', 'github-actions', 'plp127', 'tb65536']	nobody	16-60268 16 days ago	25-50302 25 days ago	0-46291 12 hours
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/)	large-import t-measure-probability WIP	1681/1	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	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-58554 16 days ago	16-58562 16 days ago	0-1 1 second
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/)	t-data awaiting-author	40/8	Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,MathlibTest/MatrixDetOne.lean	4	16	['dwrensha', 'github-actions', 'leanprover-bot', 'plp127', 'robin-carlier']	robin-carlier assignee:robin-carlier	16-52291 16 days ago	17-60429 17 days ago	12-56370 12 days
31013	vihdzp author:vihdzp	chore: deprecate `AsLinearOrder`	This goes back to Lean 3 (https://github.com/leanprover-community/mathlib3/pull/4037). It was used to prove two results about "linearly ordered lattices" [`le_sup_iff`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Lattice.html#le_sup_iff) and [`inf_le_iff`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Lattice.html#inf_le_iff) which have long since been turned into theorems on linear orders. The proper way to deal with a totally ordered partial order is to just write a `LinearOrder` instance, so there is no need for this. --- See some brief [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/AsLinearOrder/near/547525036) discussion. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	7/5	Mathlib/Order/Basic.lean	1	2	['github-actions', 'j-loreaux', 'urkud']	nobody	16-33169 16 days ago	16-51936 16 days ago	0-3299 54 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	16-50605 16 days ago	29-70269 29 days ago	0-0 0 seconds
25945	adomani author:adomani	feat: the empty line in commands linter	This linter flags empty lines within a command. It allows empty lines within doc-strings, module-docs and a couple of other "sensible" places. It also skips files that are likely to contain meta-code, since there the use of empty lines in definition is more widespread. This PR continues the work from #25236.	large-import t-linter	380/22	Mathlib.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/CommaMap.lean,Mathlib/CategoryTheory/Monoidal/Opposite/Mon_.lean,Mathlib/Data/UInt.lean,Mathlib/Init.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RingTheory/Flat/TorsionFree.lean,Mathlib/RingTheory/HahnSeries/HahnEmbedding.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/EmptyLine.lean,MathlibTest/EmptyLine.lean	13	23	['adomani', 'bryangingechen', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	16-49952 16 days ago	16-77651 16 days ago	64-31589 64 days
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/)	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	1	['github-actions']	nobody	16-45694 16 days ago	17-47210 17 days ago	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/)	t-algebra t-category-theory awaiting-CI awaiting-author WIP label:t-algebra$	180/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean	2	5	['github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	16-26366 16 days ago	16-26383 16 days ago	0-0 0 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	22/0	Mathlib/Order/Defs/PartialOrder.lean	1	1	['github-actions']	Vierkantor assignee:Vierkantor	16-21691 16 days ago	28-31271 28 days ago	28-31312 28 days
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/)	t-category-theory awaiting-author	134/0	Mathlib.lean,Mathlib/CategoryTheory/Linear/Linearization.lean	2	3	['github-actions', 'joelriou', 'kim-em']	nobody	16-20941 16 days ago	16-23451 16 days ago	2-33570 2 days
30069	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): add lemma `IsTree.dist_ne_of_adj` and necessary lemmas	This contribution was created as part of the Utrecht Summerschool "Formalizing Mathematics in Lean" in July 2025. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	34/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	8	['github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	kmill assignee:kmill	15-81659 15 days ago	15-81659 15 days ago	44-46169 44 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/)	t-measure-probability t-analysis awaiting-author	112/1	Mathlib.lean,Mathlib/MeasureTheory/Integral/BoundedContinuousFunction.lean,Mathlib/MeasureTheory/Integral/TestAgainst.lean	3	47	['EtienneC30', 'github-actions', 'j-loreaux', 'luigi-massacci']	EtienneC30 assignee:EtienneC30	15-79028 15 days ago	15-79028 15 days ago	31-80552 31 days
25803	erdOne author:erdOne	feat: taylor expansion of `1 / z ^ r`	--- This might exist somewhere else but I couldn't find them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- - [ ] depends on: #23831 This PR continues the work from #21693. Original PR: https://github.com/leanprover-community/mathlib4/pull/21693	t-analysis awaiting-author	95/0	Mathlib.lean,Mathlib/Analysis/SpecificLimits/InvPow.lean	2	6	['erdOne', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'vasnesterov']	nobody	15-77012 15 days ago	15-77015 15 days ago	8-29520 8 days
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/)	t-logic please-adopt	618/0	Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean	2	12	['ChrisHughes24', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-dependent-issues-bot', 'staroperator']	nobody	15-69258 15 days ago	16-73056 16 days ago	125-6199 125 days
30975	mariainesdff author:mariainesdff	feat(Data/Finsupp/Defs): add Finsupp.restrict	Co-authored by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	49/0	Mathlib/Data/Finsupp/Defs.lean	1	n/a	['ADedecker', 'github-actions']	nobody	15-55405 15 days ago	unknown	unknown
29946	smmercuri author:smmercuri	feat(InfinitePlace/Ramification): embeddings of unramified/ramified infinite places satisfy `IsUnmixed/IsMixed`	--- - [x] depends on: #29945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-number-theory	67/2	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri', 'xroblot']	alexjbest assignee:alexjbest	15-40952 15 days ago	15-41280 15 days ago	45-68071 45 days
30800	dagurtomas author:dagurtomas	feat(Condensed): cartesian monoidal functor LightProfinite -> LightCondSet	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	137/4	Mathlib.lean,Mathlib/Condensed/Light/Functors.lean,Mathlib/Topology/Category/CompHausLike/Cartesian.lean,Mathlib/Topology/Category/LightProfinite/Cartesian.lean	4	2	['dagurtomas', 'github-actions']	adamtopaz assignee:adamtopaz	15-21692 15 days ago	22-38981 22 days ago	22-39021 22 days
30131	fpvandoorn author:fpvandoorn	feat: alias_in attribute	* A small wrapper for adding an alias of a declaration in another namespace. * application time `.afterCompilation` is necessary for `#eval` to work correctly * Docstrings are copied, jump-to-definition works (no test in the test file, but tested locally) * To be used for CW-complexes, where lemmas are frequently duplicated between `RelCWComplex` and `CWComplex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) cc @scholzhannah	t-meta	93/0	Mathlib.lean,Mathlib/Util/AliasIn.lean,MathlibTest/Util/AliasIn.lean	3	13	['JovanGerb', 'fpvandoorn', 'github-actions']	JovanGerb assignee:JovanGerb	14-62157 14 days ago	42-51695 1 month ago	42-51670 42 days
26857	Thmoas-Guan author:Thmoas-Guan	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. Further results would be given in #26858 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22631	t-algebra awaiting-author label:t-algebra$	137/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	21	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	14-58757 14 days ago	14-58757 14 days ago	20-84636 20 days
21342	YaelDillies author:YaelDillies	refactor(Normed/Group/Quotient): generalise to non-abelian groups	The goal is to apply this to the free group. --- - [x] depends on: #21341 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	21/3	Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	2	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-42627 14 days ago	14-42653 14 days ago	0-352 5 minutes
31102	JOSHCLUNE author:JOSHCLUNE	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/)	new-contributor	61/4	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/Hammer.lean,lake-manifest.json,lakefile.lean	5	1	['github-actions']	nobody	14-35160 14 days ago	14-42068 14 days ago	14-42051 14 days
30936	themathqueen author:themathqueen	feat(Data/Int): define `Int.fib`, the Fibonacci numbers on the integers	We define `Int.fib`, the integer version of `Nat.fib`, which satisfies `Int.fib 0 = 0`, `Int.fib 1 = 1`, and `Int.fib (n + 2) = Int.fib n + Int.fib (n + 1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	172/0	Mathlib.lean,Mathlib/Data/Int/Fib.lean	2	11	['Ruben-VandeVelde', 'github-actions', 'themathqueen', 'vihdzp']	nobody	13-74792 13 days ago	17-56421 17 days ago	18-52083 18 days
30758	Timeroot author:Timeroot	chore: tag abs_inv and abs_div with grind=	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	2/1	Mathlib/Algebra/Order/Field/Basic.lean	1	n/a	['github-actions']	nobody	13-73506 13 days ago	unknown	unknown
28399	Ruben-VandeVelde author:Ruben-VandeVelde	feat: ring-theoretic fractions in Rat	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	47/0	Mathlib.lean,Mathlib/RingTheory/Localization/Rat.lean	2	7	['github-actions', 'kckennylau']	robertylewis assignee:robertylewis	13-60538 13 days ago	13-60538 13 days ago	78-20583 78 days
26011	linesthatinterlace author:linesthatinterlace	feat: add elementary lifts for `OneHom`, `MulHom`, `MonoidHom` and `RingHom`.	This PR continues the work from #25264. Original PR: https://github.com/leanprover-community/mathlib4/pull/25264	migrated-from-branch t-algebra label:t-algebra$	422/15	Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	13-58905 13 days ago	13-58934 13 days ago	31-41327 31 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/)	t-topology	138/0	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Constructions.lean	3	6	['github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	urkud assignee:urkud	13-55955 13 days ago	13-58808 13 days ago	107-7622 107 days
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/)	CI awaiting-author	1/1	bors.toml	1	3	['bryangingechen', 'eric-wieser', 'github-actions']	nobody	13-45614 13 days ago	13-45614 13 days ago	0-64677 17 hours
26588	faenuccio author:faenuccio	feat(Algebra/GroupWithZero/WithZero): add the multiplicative embedding with zero from the range	We extend the embedding of the range of a `MonoidWithZeroHom` to the codomain by enriching it with the structure of an ordered, multiplicative embedding. In passing, we extend some results about the embedding of `WithZero` of the units of a group with zero, to the group itself. Co-authored by: María Inés de Frutos Fernández @mariainesdff --- - [x] depends on: #29594 - [x] depends on: #29644 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	114/2	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean	3	108	['YaelDillies', 'eric-wieser', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	YaelDillies assignee:YaelDillies	13-40268 13 days ago	17-64128 17 days ago	51-1976 51 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	65/20	Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean	1	5	['github-actions', 'mariainesdff']	mariainesdff assignee:mariainesdff	13-26419 13 days ago	13-26476 13 days ago	31-12462 31 days
30525	515801431 author:515801431	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.	new-contributor t-combinatorics	109/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	2	['IvanRenison', 'github-actions']	awainverse assignee:awainverse	13-21691 13 days ago	31-15705 1 month ago	31-15739 31 days
30768	tb65536 author:tb65536	chore(GroupTheory/Subgroup/Centralizer): replace `centralizer (zpowers s)` with `centralizer {s}`	This PR fixes some lingering technical debt from two years ago: https://github.com/leanprover-community/mathlib3/pull/18965 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory t-algebra label:t-algebra$	32/34	Mathlib/Algebra/Group/Subgroup/ZPowers/Lemmas.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/Subgroup/Centralizer.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/Topology/Algebra/Group/SubmonoidClosure.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	1	['github-actions']	mattrobball assignee:mattrobball	13-21688 13 days ago	22-37296 22 days ago	22-37270 22 days
30855	Ruben-VandeVelde author:Ruben-VandeVelde	fix: deprecate IsTotal in favour of Std.Total	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC	208/111	Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Sigma/Lex.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Order/Antisymmetrization.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Comparable.lean,Mathlib/Order/Compare.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/Directed.lean,Mathlib/Order/Filter/FilterProduct.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/Order/WithBot.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	33	1	['github-actions']	alexjbest assignee:alexjbest	13-21684 13 days ago	20-58384 20 days ago	20-58358 20 days
30867	erdOne author:erdOne	feat(RingTheory/Etale): standard etale maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	315/1	Mathlib.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/RingTheory/Etale/StandardEtale.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	5	1	['github-actions']	mariainesdff assignee:mariainesdff	13-21682 13 days ago	20-28854 20 days ago	20-35299 20 days
31119	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph/Walk): a vertex of a walk is in its tail starting from the second vertex onwards	Add helper theorems for https://github.com/leanprover-community/mathlib4/pull/29309 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	10/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	3	['SnirBroshi', 'github-actions']	nobody	13-3196 13 days ago	13-76266 13 days ago	13-76970 13 days
30322	kckennylau author:kckennylau	feat(RingTheory): base change of graded algebra	In this file we show that if `𝒜` is a graded `R`-algebra, and `S` is any `R`-algebra, then `S ⊗[R] 𝒜` (which is actually `fun i ↦ (𝒜 i).baseChange S`) is a graded `S`-algebra with the same grading. --- Split from #26061. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		272/47	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	dupuisf assignee:dupuisf	12-80403 12 days ago	13-26595 13 days ago	35-38499 35 days
31120	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): toSubgraph and Subgraph.map preserve connectivity	Add helper theorems for https://github.com/leanprover-community/mathlib4/pull/29309 --- - [ ] depends on : #31118 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	42/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	nobody	12-72814 12 days ago	13-1467 13 days ago	13-74746 13 days
31148	kex-y author:kex-y	feat(Probability): Local and stable properties	Defines local and stable properties which is useful for local martingales. Co-authored-by: @RemyDegenne --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	644/0	Mathlib/Probability/Process/Filtration.lean,Mathlib/Probability/Process/LocalMonad.lean,Mathlib/Probability/Process/LocalProperty.lean,Mathlib/Probability/Process/Stopping.lean,Mathlib/Topology/Order/WithTop.lean	5	3	['RemyDegenne', 'github-actions', 'kex-y']	nobody	12-61986 12 days ago	12-62020 12 days ago	0-2992 49 minutes
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	12-58767 12 days ago	27-69615 27 days ago	0-0 0 seconds
30880	themathqueen author:themathqueen	feat(Analysis/InnerProductSpace): finite-dimensional inner product space with coalgebra implies an algebra structure	A finite-dimensional inner product space with a coalgebra structure also has an algebra structure by taking adjoints of the comultiplication map and counit map, i.e., `x * y = (adjoint comul) (x ⊗ₜ y)` and `algebraMap = adjoint counit`. TODO: There is also the opposite implication, i.e., a finite-dimensional inner product space with an algebra structure implies a coalgebra where `counit = adjoint Algebra.linearMap` and `comul = adjoint mul'`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	123/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Coalgebra.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean	3	1	['github-actions']	urkud assignee:urkud	12-21695 12 days ago	19-65215 19 days ago	19-70790 19 days
30345	vlad902 author:vlad902	feat(Order): replace the implementation of `Set.chainHeight`	`Set.chainHeight` is unused in Mathlib--it was a previous attempt to formalize heights for preorders before `Order.height` came into use. The current implementation `Set.chainHeight` is previously defined for Sets that had an `LT` order but it's behavior was unexpected for relations that were not strict orders, e.g. singleton sets with a reflexive relation would have infinite height. LE is such a relation so this implementation is very limited in what it could be used for. I replace it with an implementation that: - Is defined for arbitrary relations instead of using `[LT]`. - Uses `IsChain` instead of `List.IsChain` for defining chains. This is equivalent for transitive relations, but behaves differently for non- transitive relations--it requires that all elements in the set are comparable instead of just comparability between neighboring elements in the List. This makes the definition better behaved for e.g. reflexive relations and better matches the definition of chain height typically used in the literature. The API has been slimmed down but what remains largely matches the previous API. Discussed on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Definitions.20for.20chain.20height.2Fpartitions/near/542823244) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	133/292	Mathlib/Order/Height.lean	1	6	['Vierkantor', 'github-actions', 'mathlib4-merge-conflict-bot', 'vlad902']	b-mehta assignee:b-mehta	11-31875 11 days ago	11-31875 11 days ago	29-39972 29 days
31178	morrison-daniel author:morrison-daniel	feat(LinearAlgebra/Multilinear): basis for multilinear maps	Adds a basis for MulilinearMap given bases for the domain and codomain. This PR builds upon work started in #25141 toward #11155. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra label:t-algebra$	567/10	Mathlib.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/Finsupp.lean,Mathlib/LinearAlgebra/Multilinear/Pi.lean	10	n/a	['github-actions']	nobody	11-31557 11 days ago	unknown	unknown
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for 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/)	new-contributor t-combinatorics awaiting-author	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	3	['github-actions', 'grunweg']	nobody	10-77101 10 days ago	82-53074 2 months ago	12-41939 12 days
28198	Sebi-Kumar author:Sebi-Kumar	feat(Analysis/InnerProductSpace/PiL2): Add instances for EuclideanSpace rank and EuclideanSpace being infinite	Add an instance for `Fact (Module.finrank 𝕜 (EuclideanSpace 𝕜 (Fin n)) = n)` which is needed to apply [stereographic'](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Geometry/Manifold/Instances/Sphere.html#stereographic') to EuclideanSpace. Also add an instance for `Infinite (EuclideanSpace 𝕜 ι)` where `ι` is a nonempty fintype. I wasn't sure if these should go in separate pull requests, but they seemed similar enough to me. Thank you to Kenny Lau for the suggestions at [#mathlib4 > Instances for EuclideanSpace](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Instances.20for.20EuclideanSpace). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so 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. My goal is to contribute that the `n`-sphere is simply connected for `n > 1`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	6/0	Mathlib/Analysis/InnerProductSpace/PiL2.lean	1	7	['Ruben-VandeVelde', 'Sebi-Kumar', 'github-actions', 'kckennylau']	urkud assignee:urkud	10-76166 10 days ago	10-76166 10 days ago	82-22614 82 days
30363	smmercuri author:smmercuri	feat: `PadicInt` is isomorphic to the integers of the uniform space completion `(Rat.padicValuation p).Completion`	- Uniform and ring isomorphisms between `𝒪[(Rat.padicValuation p).Completion]` and `ℤ_[p]` - A homeomorphism `e : X ≃ Y` gives a closed set `{ x : X \| p x ↔ q (e x) }` for clopen subsets given by `p` and `q` - Move `Padic.isUnit_den` to an earlier file to avoid having to import `Padics.RingHoms` unnecessarily --- - [x] depends on: #30361 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		86/21	Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Topology/Homeomorph/Defs.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	10-73862 10 days ago	35-51846 1 month ago	35-54377 35 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	t-ring-theory WIP	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	13	['ScottCarnahan', 'github-actions', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	10-73227 10 days ago	10-73227 10 days ago	80-45817 80 days
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/)	new-contributor t-algebra awaiting-author label:t-algebra$	94/0	Mathlib/LinearAlgebra/Matrix/Transvection.lean,MathlibTest/matrix.lean	2	3	['github-actions', 'riccardobrasca', 'zach1502']	nobody	10-70960 10 days ago	10-70960 10 days ago	42-32522 42 days
30609	FlAmmmmING author:FlAmmmmING	feat(Combinatorics/Enumerative/Catalan): large and small Schröder numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	129/1	Mathlib/Combinatorics/Enumerative/Catalan.lean	1	5	['FlAmmmmING', 'SnirBroshi', 'YaelDillies', 'github-actions', 'plp127']	nobody	10-69011 10 days ago	10-82100 10 days ago	17-66663 17 days
30881	FlAmmmmING author:FlAmmmmING	feat(RingTheory/PowerSeries/Schroder.lean) : Define the generating function for large and small Schroder number	Define the generating function for large and small Schroder number. Main result : Prove some lemmas and the generating function of large Schroder. Todo : Prove the generating function of small Schroder. - depends on: #30609 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	350/1	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/RingTheory/PowerSeries/Schroder.lean	3	1	['github-actions']	dwrensha assignee:dwrensha	10-68346 10 days ago	19-69972 19 days ago	19-69958 19 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 WIP	130/0	Mathlib.lean,Mathlib/Analysis/Calculus/TaylorIntegral.lean	2	1	['github-actions']	nobody	10-67839 10 days ago	12-21987 12 days ago	0-1 1 second
30109	scholzhannah author:scholzhannah	feat: the subcomplexes of a (relative classical) CW complex form a completely distributive lattice	In this PR we prove that the space of subcomplexes `Subcomplex C` of a (relative classical) CW complex `C` is a `CompletelyDistribLattice`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	368/1	Mathlib/Order/Lattice.lean,Mathlib/Topology/CWComplex/Classical/Subcomplex.lean	2	19	['ADedecker', 'github-actions', 'scholzhannah']	nobody	10-59941 10 days ago	10-59941 10 days ago	6-69887 6 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/)	new-contributor t-analysis awaiting-author WIP	468/0	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	3	20	['YaelDillies', 'agjftucker', 'github-actions', 'igorkhavkine', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	10-52705 10 days ago	33-34310 1 month ago	50-22679 50 days
30439	plp127 author:plp127	feat: `norm_num` extension for `IsSquare` on `Nat`, `Int`, `Rat`	Write a `norm_num` extension to evaluate `IsSquare` for `Nat`, `Int`, `Rat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	152/1	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/IsSquare.lean,MathlibTest/norm_num_ext.lean	4	10	['Rob23oba', 'dwrensha', 'github-actions', 'plp127', 'vasnesterov']	dwrensha assignee:dwrensha	10-37412 10 days ago	33-58027 1 month ago	33-58058 33 days
31107	rudynicolop author:rudynicolop	feat(Data/Multiset): add Multiset filter and bind lemmas	Add basic lemmas equating `Multiset` `filter`, `filterMap`, `join`, and `bind` operations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	67/2	Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Filter.lean	2	7	['Ruben-VandeVelde', 'github-actions', 'rudynicolop']	nobody	10-20409 10 days ago	14-31106 14 days ago	14-31142 14 days
30391	rudynicolop author:rudynicolop	feat(Data/List): list splitting definitions and lemmas	This PR continues the work from #24395. Original PR: https://github.com/leanprover-community/mathlib4/pull/24395	t-data new-contributor	154/2	Mathlib/Data/List/Perm/Lattice.lean,Mathlib/Data/List/TakeDrop.lean	2	7	['BoltonBailey', 'github-actions', 'rudynicolop']	nobody	10-19897 10 days ago	35-28278 1 month ago	35-28312 35 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/)	new-contributor t-combinatorics awaiting-author	9/4	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	3	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	10-4090 10 days ago	10-4090 10 days ago	31-69826 31 days
26544	vihdzp author:vihdzp	feat(SetTheory/ZFC/Ordinal): Lean ordinals to ZFC ordinals	We define `Ordinal.toZFSet` and prove that its outputs are precisely the ZFC ordinals. Moved from #19985. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-set-theory delegated	166/5	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/PSet.lean,Mathlib/SetTheory/ZFC/Rank.lean	4	26	['alreadydone', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib-bors', 'staroperator', 'vihdzp']	b-mehta assignee:b-mehta	10-2034 10 days ago	10-2034 10 days ago	84-52000 84 days
31168	Rob23oba author:Rob23oba	fix: reduce the amount of coercion instances that are always tried	Previously, there were a couple of coercion instances that are rarely used but still always tried (e.g. from `SignType`). This PR replaces those with `CoeDep` instances. Note: `CoeDep` is used here even though the coercions are non-dependent because it is similar to `CoeHTCT` but is meant to be used from the user side in contrast to `CoeHTCT`, which is an implementation detail. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Matrix.20multiplication.20notation.20failed/with/548327898 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		41/44	Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Order/Module/PositiveLinearMap.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Analysis/CStarAlgebra/CompletelyPositiveMap.lean,Mathlib/Data/Sign/Defs.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/MetricSpace/Isometry.lean	14	1	['github-actions']	Vierkantor assignee:Vierkantor	9-77375 9 days ago	12-38665 12 days ago	12-38639 12 days
27308	xyzw12345 author:xyzw12345	feat(LinearAlgebra/SymmetricAlgebra): IsSymmetricAlgebra	This PR continues the work from #24602. Original PR: https://github.com/leanprover-community/mathlib4/pull/24602	t-algebra label:t-algebra$	107/1	Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basis.lean	2	13	['github-actions', 'kckennylau', 'mattrobball', 'xyzw12345']	mattrobball assignee:mattrobball	9-69261 9 days ago	9-72891 9 days ago	116-8130 116 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	22/0	Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean	2	7	['github-actions', 'kckennylau', 'mariainesdff']	mariainesdff assignee:mariainesdff	9-66599 9 days ago	10-45158 10 days ago	33-77602 33 days
27245	rirarika author:rirarika	feat: multivariate polynomial ring properties about irreducibility	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	88/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Irreducible.lean	2	5	['alreadydone', 'github-actions', 'mbkybky']	alreadydone assignee:alreadydone	9-60481 9 days ago	9-60481 9 days ago	109-22535 109 days
27229	WilliamCoram author:WilliamCoram	feat(GroupTheory/DoubleCoset): multiple lemmas	From FLT --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory FLT new-contributor	88/0	Mathlib/GroupTheory/DoubleCoset.lean	1	31	['Ruben-VandeVelde', 'WilliamCoram', 'github-actions', 'kim-em', 'mariainesdff', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	9-58989 9 days ago	10-49933 10 days ago	103-2071 103 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 label:t-algebra$	182/0	Mathlib/Algebra/CharP/Invertible.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean	2	3	['github-actions', 'mans0954', 'urkud']	jcommelin assignee:jcommelin	9-58811 9 days ago	151-67162 4 months ago	151-67198 151 days
27516	gaetanserre author:gaetanserre	feat: add rational approximation lemma for suprema in `unitInterval`	Add `sSup_eq_iUnion_rat` lemma that provides a rational approximation characterization of suprema in the unit interval. For monotone functions `f : α → I → ℝ`, the lemma establishes that the set of pairs where `a < sSup {x \| f e.1 x < e.2}` equals the union over all rationals `q ∈ I` with `q > a` of the sets `{e \| f e.1 q < e.2}`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	44/0	Mathlib/MeasureTheory/Constructions/UnitInterval.lean,Mathlib/Topology/UnitInterval.lean	2	8	['gaetanserre', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'ocfnash']	j-loreaux assignee:j-loreaux	9-58444 9 days ago	9-58919 9 days ago	97-76852 97 days
30608	grunweg author:grunweg	feat: another lemma about derivatives of parametric integrals	On the path towards proving that integrating smooth functions is smooth. From the sphere-eversion project; I am just upstreaming this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	125/0	Mathlib/Analysis/Calculus/ParametricIntegral.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	9-57630 9 days ago	9-57630 9 days ago	18-81847 18 days
31103	YaelDillies author:YaelDillies	feat: removing leaves from a connected graph keeps it connected	... using properties of 2-connected components. From the ProofBench workshop --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	78/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Data/List/Nodup.lean	2	6	['SnirBroshi', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	9-53306 9 days ago	9-78826 9 days ago	14-23809 14 days
30639	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Connected): `IsBridge` is antitone	--- - [x] depends on: #30602 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	1	5	['SnirBroshi', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-51730 9 days ago	9-51925 9 days ago	9-62471 9 days
30612	grunweg author:grunweg	feat: add ContDiff.lipschitzOnWith	A C¹ function is Lipschitz on each convex compact set. From sphere-eversion. Re-done version of https://github.com/leanprover-community/mathlib4/pull/12673. --- Help completing the last sorries is welcome! [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	82/10	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean	1	6	['github-actions', 'grunweg', 'ocfnash', 'peabrainiac']	ocfnash assignee:ocfnash	9-51110 9 days ago	9-51132 9 days ago	0-1970 32 minutes
30894	dupuisf author:dupuisf	feat(CStarAlgebra): the log is operator monotone	This PR shows that the logarithm is operator monotone, i.e. `CFC.log` is monotone on `{a : A \| IsStrictlyPositive a}` where `A` is a unital C*-algebra. Note that we rename `Mathlib.Analysis.SpecialFunctions.ContinuousFunctionalCalculus.ExpLog` to `Mathlib.Analysis.SpecialFunctions.ContinuousFunctionalCalculus.ExpLog.Basic` in order to add `Order.lean` in that folder with the main result. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	382/175	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog/Order.lean,Mathlib/Analysis/SpecialFunctions/Log/RpowTendsto.lean	7	8	['github-actions', 'j-loreaux', 'urkud']	j-loreaux assignee:j-loreaux	9-45090 9 days ago	9-45246 9 days ago	9-58886 9 days
29758	SnirBroshi author:SnirBroshi	feat(RingTheory/RootsOfUnity): exp(pi * i * q) is a root of unity for rational q	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	33/4	Mathlib/RingTheory/RootsOfUnity/Complex.lean	1	7	['Ruben-VandeVelde', 'SnirBroshi', 'chrisflav', 'github-actions', 'kckennylau']	chrisflav assignee:chrisflav	9-38897 9 days ago	9-38910 9 days ago	55-44770 55 days
30246	dwrensha author:dwrensha	make Nat.digits use well-founded recursion once again	#25864 made `Nat.digits` structurally recursive, which has some benefits. In doing so, however, it added significant complexity. As brought up in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/structural.20recursion.20instead.20of.20well.20founded/near/543172385), on the balance that PR might not be considered an improvement. The present PR reverts that change (but keeps a code golf that was bundled with it). Note that recent improvements to core Lean mean that `simp` can handle the structurally recursive version without a problem: ```lean example : digits 10 123456789 = [9,8,7,6,5,4,3,2,1] := by simp [digits, digitsAux] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/45	Mathlib/Data/Nat/Digits/Defs.lean	1	8	['alreadydone', 'dwrensha', 'github-actions', 'j-loreaux', 'plp127']	TwoFX assignee:TwoFX	9-38543 9 days ago	39-50041 1 month ago	39-50070 39 days
31243	FlAmmmmING author:FlAmmmmING	feat(Mathlib/Combinatorics/SimpleGraph/Planar.lean): Define the planar graph in mathlib	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	62/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean	2	5	['SnirBroshi', 'github-actions']	nobody	9-37486 9 days ago	10-12675 10 days ago	10-12710 10 days
30648	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): define the strict width of a subgroup	We define the periods of a subgroup of GL(2, R) to be the `x` such that `!![1, x; 0, 1]` is in the subgroup, and the strict width to be the unique positive generator of this subgroup (when it exists). This is a variant of a more familiar modular-forms concept, the width, which is the least positive `x` such that `± !![1, x; 0, 1]` is in the subgroup (note signs `±`). However, the strict width is the concept that's relevant for q-expansions. --- Carved off from the WIP PR #30089. - [x] depends on: #30461 - [x] depends on: #30471 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	182/2	Mathlib/NumberTheory/ModularForms/Cusps.lean	1	8	['CBirkbeck', 'github-actions', 'loefflerd', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	alreadydone assignee:alreadydone	9-35217 9 days ago	16-30407 16 days ago	16-31304 16 days
30181	alreadydone author:alreadydone	feat(Data/Nat): reducible strong recursion	+ Redefine `Nat.strongRec'` to allow Lean kernel computation (reduction) with the strong Nat recursor. TODO: maybe merge this with Batteries' `Nat.strongRec`. + Redefine `Nat.xgcd` to use `Nat.strongRec'` to allow kernel reduction. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	46/72	Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Init.lean	3	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	pechersky assignee:pechersky	9-21697 9 days ago	41-34702 1 month ago	41-40748 41 days
30477	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Bisector): oriented angle bisection and equal distance	Add a lemma ```lean lemma dist_orthogonalProjection_eq_iff_oangle_eq {p p' : P} {s₁ s₂ : AffineSubspace ℝ P} [s₁.direction.HasOrthogonalProjection] [s₂.direction.HasOrthogonalProjection] (hp' : p' ∈ s₁ ⊓ s₂) (hne : haveI : Nonempty s₁ := ⟨p', hp'.1⟩; haveI : Nonempty s₂ := ⟨p', hp'.2⟩; (orthogonalProjection s₁ p : P) ≠ orthogonalProjection s₂ p) (hp₁ : haveI : Nonempty s₁ := ⟨p', hp'.1⟩; orthogonalProjection s₁ p ≠ p') (hp₂ : haveI : Nonempty s₂ := ⟨p', hp'.2⟩; orthogonalProjection s₂ p ≠ p') : haveI : Nonempty s₁ := ⟨p', hp'.1⟩ haveI : Nonempty s₂ := ⟨p', hp'.2⟩ dist p (orthogonalProjection s₁ p) = dist p (orthogonalProjection s₂ p) ↔ ∡ (orthogonalProjection s₁ p : P) p' p = ∡ p p' (orthogonalProjection s₂ p) := ``` that is an oriented angle analogue of the existing `dist_orthogonalProjection_eq_iff_angle_eq`. Because the minimal nondegeneracy conditions required for the two directions of this lemma are different (whereas the unoriented version doesn't need any nondegeneracy conditions), those two directions are added as separate lemmas, each with minimal nondegeneracy conditions, from which the `iff` version is then deduced. --- - [ ] depends on: #30474 - [ ] depends on: #30476 - [ ] depends on: #30698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-euclidean-geometry	106/0	Mathlib/Geometry/Euclidean/Angle/Bisector.lean	1	3	['github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	JovanGerb assignee:JovanGerb	9-21695 9 days ago	17-1212 17 days ago	17-3535 17 days
30637	strihanje01 author:strihanje01	feat(Combinatorics/SetFamily/Lindstrom): Lindstrom's theorem for subfamilies with equal unions	add Lindstrom's theorem and its strengthening for equal intersections --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	210/0	Mathlib.lean,Mathlib/Combinatorics/SetFamily/Lindstrom.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	9-21694 9 days ago	27-48962 27 days ago	27-49004 27 days
30733	harahu author:harahu	doc(Combinatorics): spell cliquefree as clique-free	This change was initially suggested to me by Codex, as part of #30621, but it made sense to do this as a free-standing PR, since this change requires some justification, and this PR provides just that. The fact that Codex is encouraging this change does not mean much on its own, so I did my best to check the literature. Searching on Google Scholar yields a mere [four results](https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22cliquefree%22) for "cliquefree" and [423 results](https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22clique-free%22) for "clique-free". Based on these results, I think it is safe to say that "cliquefree" is quite idiosyncratic, and should be avoided. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	12/12	Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean,Mathlib/Combinatorics/SimpleGraph/FiveWheelLike.lean	4	1	['github-actions']	b-mehta assignee:b-mehta	9-21691 9 days ago	24-39439 24 days ago	24-39479 24 days
30885	erdOne author:erdOne	chore(RingTheory): better defeqs for `PrimeSpectrum.preimageOrderIsoTensorResidueField`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	94/30	Mathlib/RingTheory/Ideal/Prime.lean,Mathlib/RingTheory/LocalRing/ResidueField/Fiber.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean	3	1	['github-actions']	chrisflav assignee:chrisflav	9-21687 9 days ago	19-53273 19 days ago	19-53319 19 days
30973	vihdzp author:vihdzp	feat: generalize `Finsupp.lex_lt_iff_of_unique`	--- - [x] depends on: #30481 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	46/13	Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Order/PiLex.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	9-21686 9 days ago	16-62904 16 days ago	16-71769 16 days
30984	erdOne author:erdOne	feat(RingTheory): lemmas about scaleRoots	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	120/5	Mathlib/RingTheory/Polynomial/IntegralNormalization.lean,Mathlib/RingTheory/Polynomial/ScaleRoots.lean	2	2	['erdOne', 'github-actions']	chrisflav assignee:chrisflav	9-21684 9 days ago	17-32597 17 days ago	17-32698 17 days
30994	kim-em author:kim-em	feat: `fix_deprecations.py` script		CI	131/0	scripts/README.md,scripts/fix_deprecations.py	2	18	['SnirBroshi', 'github-actions', 'kim-em']	bryangingechen assignee:bryangingechen	9-21682 9 days ago	16-78180 16 days ago	16-78221 16 days
31011	YuvalFilmus author:YuvalFilmus	feat: properties of Chebyshev polynomials over the reals	Added several properties of the Chebyshev polynomials: - Degrees of T_n, U_n - Leading coefficients of T_n, U_n - Evaluations ofT_n, U_n at the endpoints ±1 - T_n is bounded on [-1, 1], and vice versa - Zeroes of T_n and U_n, and extrema of T_n - Normalized T_n minimizes the maximum absolute value over [-1, 1] for monic polynomials --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	989/5	Mathlib.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/RingTheory/Polynomial/Chebyshev.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Basic.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Monic.lean	7	22	['Ruben-VandeVelde', 'YuvalFilmus', 'github-actions', 'plp127']	Vierkantor assignee:Vierkantor	9-21677 9 days ago	16-55372 16 days ago	16-55399 16 days
26039	tsuki8 author:tsuki8	feat(RingTheory/MvPolynomial/{MonomialOrder,Ideal}): leadingTerm	define the leadingTerm and prove some lemmas related to the def `leadingTerm`: the leading term of `f` for the monomial ordering `m` some basic lemmas about leadingTerm including: 1. `leadingTerm_eq_zero_iff` 2. `leadingTerm_image_sdiff_singleton_zero` 3. `leadingTerm_image_insert_zero` 4. `leadingTerm_zero` 5. `leadingTerm_degree_eq` 6. `leadingTerm_degree_eq'` some lemmas about the degree of `f - m.leadingTerm f`: 1. `degree_sub_leadingTerm` 2. `degree_sub_leadingTerm_lt_degree` 3. `degree_sub_leadingTerm_lt_iff` also some lemmas about leading terms and ideals： 1. `span_leadingTerm_sdiff_singleton_zero` 2. `span_leadingTerm_insert_zero` 3. `span_leadingTerm_eq_span_monomial` 4. `span_leadingTerm_eq_span_monomial'` Co-authored-by: Junyu Guo @Hagb --- - [x] depends on: #24361 - [x] depends on: #26148 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import new-contributor	142/1	Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean	2	38	['Hagb', 'chrisflav', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	9-14658 9 days ago	9-14658 9 days ago	26-64663 26 days
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/)		1331/0	Mathlib.lean,Mathlib/NumberTheory/Zsigmondy.lean	2	7	['dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yury-harmonic']	nobody	9-10478 9 days ago	17-53773 17 days ago	0-0 0 seconds
29788	robertmaxton42 author:robertmaxton42	feat (Topology): adds bundled continuous maps for sum, sigma, subtype, mapsto, inclusion	Adds a collection of bundled continuous maps and homeomorphisms, and helper lemmas for working with their compositions. Bundling of existing continuity lemmas: * `ContinuousMap.subtypeVal` * `ContinuousMap.inl` and `.inr`; `ContinuousMap.sum` bundles `Continuous.sumElim`; `ContinuousMap.sumMap`, which is a quotient map when both components are quotient maps * `ContinuousMap.sigmaMap`, which is a quotient map when given a family of quotient maps * `ContinuousMap.mapsTo` bundles `ContinuousOn.restrict_mapsTo` New functions: * `ContinuousMap.preimageValIncl : C(s ↓∩ t, t)` and `.inclPreimageVal C(s, t ↓∩ s)`, and their unbundled functions in `Set` * `Homeomorph.Set.preimageVal` witnesses that the two are opposite directions of a homeomorphism * Descending from a coherent set of subspaces is a quotient map The primary use for these bundled maps is easy composition and the ability to introduce them by rewriting right-to-left: it is much more convenient to write `subtypeVal.comp _` than to use either the anonymous constructor (which doesn't work in any position without an expected type) or `ContinuousMap.mk` (which will disappear as soon as it is coerced to a function, making it difficult to use in mixed-categorical contexts where many maps can only be reduced by introducing a composition with some other map.) This PR is part of a family of PRs that ultimately construct transformations in both directions between the concrete `Topology.RelCWComplex` and abstract `TopCat.RelativeCWComplex`. `.mapsTo` in particular bundles together a couple of potentially nontrivial proofs in a way that makes them easy to refer to later; I use it and `.subtypeVal` particularly heavily later in a dependent PR to build the cell inclusion maps on both sides of the equivalence. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	226/3	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	14	['adamtopaz', 'github-actions', 'robertmaxton42']	adamtopaz assignee:adamtopaz	9-9358 9 days ago	41-19216 1 month ago	56-15292 56 days
26777	YaelDillies author:YaelDillies	chore(Data/Set/Image): move `BooleanAlgebra` material to `Order`	Eventually, all order properties should move out, but this is a good fourth step that will, among others, unblock #23177. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data WIP	143/118	Mathlib/Algebra/Notation/Support.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Set/Restrict.lean,Mathlib/Data/Set/SymmDiff.lean,Mathlib/Logic/Equiv/Embedding.lean,Mathlib/Order/BooleanAlgebra/Set.lean,Mathlib/Order/CompleteBooleanAlgebra.lean	8	10	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	8-79925 8 days ago	8-79947 8 days ago	2-29376 2 days
26071	linesthatinterlace author:linesthatinterlace	feat: Add `id` and `comp` classes for `FunLike` and `refl`, `trans` and `symm` classes for `EquivLike`	Adds classes depending on `FunLike` that capture "this has an identity/this has a notion of composition". --- This is a prototype and comments on this are requested. I think a similar model could be used to create a generalisation for Equiv.symm. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC WIP	314/23	Mathlib/Data/FunLike/Basic.lean,Mathlib/Data/FunLike/Equiv.lean,Mathlib/Logic/Equiv/Defs.lean	3	21	['Rob23oba', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	8-71299 8 days ago	8-71299 8 days ago	0-1 1 second
28944	linesthatinterlace author:linesthatinterlace	refactor(Order/Hom/Basic): reorder definitions	Reorder and disentangle definitions for OrderHom, OrderEmbedding and OrderIso. --- This is a preamble to making all of these `def` and consistently defined - the aim is to first disentangle the definitions as it will make it more straightforward to perform these later PRs. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	215/180	Mathlib/Order/Hom/Basic.lean	1	13	['YaelDillies', 'github-actions', 'linesthatinterlace', 'mathlib4-merge-conflict-bot']	YaelDillies, b-mehta, linesthatinterlace assignee:YaelDillies assignee:b-mehta assignee:linesthatinterlace	8-64928 8 days ago	8-79644 8 days ago	26-6130 26 days
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	large-import t-algebra awaiting-author label:t-algebra$	54/2	Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	2	8	['github-actions', 'pechersky', 'smmercuri']	nobody	8-53852 8 days ago	49-8093 1 month ago	44-43929 44 days
30560	dwrensha author:dwrensha	fix(LinearAlgebra/Alternating/Basic): avoid deep recursion in MultilinearMap.alternatization	Makes `MultilinearMap.alternatization` an `irreducible_def` to avoid errors about deep recursion. This is an update of #15045 according to the suggestions 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/)	t-algebra awaiting-author label:t-algebra$	36/9	Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,MathlibTest/DetOne.lean	3	6	['dagurtomas', 'dwrensha', 'eric-wieser', 'github-actions']	dagurtomas assignee:dagurtomas	8-50230 8 days ago	8-50230 8 days ago	21-72141 21 days
30974	mariainesdff author:mariainesdff	feat(Algebra/Algebra/Basic): add RingHom.commSemiringToCommRing	Co-authored by: @AntoineChambert-Loir --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	8/0	Mathlib/Algebra/Algebra/Basic.lean	1	1	['github-actions']	nobody	8-49978 8 days ago	17-51530 17 days ago	17-51565 17 days
29354	themathqueen author:themathqueen	refactor(Algebra/Algebra/Equiv): allow for non-unital `AlgEquiv`	This refactors `AlgEquiv` to allow for non-unital algebras. More specifically, we weaken the type class assumptions from: ```lean structure AlgEquiv (R A B : Type) [CommSemiring R] [Semiring A] [Semiring B] [Algebra R A] [Algebra R B] ``` to ```lean structure AlgEquiv (R A B : Type) [Add A] [Add B] [Mul A] [Mul B] [SMul R A] [SMul R B] ``` Instead of a `commutes'` field, we now have a `map_smul'` field. We also include a definition `AlgEquiv.ofCommutes` which takes in a `RingEquiv` and a `commutes'` field to match before and for convenience. `StarAlgEquiv` now extends `AlgEquiv`. We also generalize a few files to allow for non-unital. I suspect there are a few more things to generalize, but will leave this for later. Co-authored-by: Jireh Loreaux --- Revives #8686. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	560/491	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/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/Module/Basic.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/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.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/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/Unique.lean,Mathlib/LinearAlgebra/TensorProduct/Graded/Internal.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Finiteness/Basic.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/Artinian.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/Kaehler/Basic.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/RingTheory/MvPolynomial/Localization.lean,Mathlib/RingTheory/Norm/Basic.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/PolynomialAlgebra.lean,Mathlib/RingTheory/PowerSeries/WeierstrassPreparation.lean,Mathlib/RingTheory/RingHom/FiniteType.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Pi.lean,Mathlib/RingTheory/Spectrum/Prime/Polynomial.lean,Mathlib/RingTheory/TensorProduct/Maps.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/TensorProduct/Pi.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/Unramified/Field.lean,Mathlib/Topology/Algebra/Algebra/Equiv.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean,Mathlib/Topology/LocallyConstant/Algebra.lean,MathlibTest/GalNotation.lean	100	35	['fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	joelriou assignee:joelriou	8-43875 8 days ago	8-43899 8 days ago	57-61703 57 days
30423	erdOne author:erdOne	feat(RingTheory): API for valuative rel	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	187/42	Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Trivial.lean	2	11	['erdOne', 'github-actions', 'mariainesdff', 'pechersky']	mariainesdff assignee:mariainesdff	8-39920 8 days ago	8-39920 8 days ago	33-16217 33 days
30214	SnirBroshi author:SnirBroshi	feat(Data/List/Basic): add `Fin` variants of `*mem_iff_getElem`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	8/0	Mathlib/Data/List/Basic.lean	1	5	['SnirBroshi', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	8-37887 8 days ago	8-37906 8 days ago	40-27052 40 days
19046	j-loreaux author:j-loreaux	feat: define class `SemigroupAction`	--- If I can get this building with minimal performance impact, I would like to change the names to: `MulAction → MonoidAction` `SemigroupAction → MulAction` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	48/26	Mathlib/Algebra/Azumaya/Matrix.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/Action/TypeTags.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/RingTheory/Trace/Basic.lean	13	12	['alreadydone', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	jcommelin assignee:jcommelin	8-31202 8 days ago	77-37951 2 months ago	83-65231 83 days
31038	rudynicolop author:rudynicolop	feat(Computability/NFA): NFA acceptsFrom definitions and lemmas	This PR defines `NFA.acceptsFrom`, similar to [`DFA.acceptsFrom`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Computability/DFA.html#DFA.acceptsFrom), and provides helper lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	108/6	Mathlib/Computability/NFA.lean	1	23	['eric-wieser', 'github-actions', 'rudynicolop']	nobody	8-24379 8 days ago	16-23892 16 days ago	16-23939 16 days
30318	joelriou author:joelriou	feat(Algebra/ModuleCat/Presheaf): composition of pushforwards and pullbacks and compatibilites	The composition of two pullback functors on presheaves of modules `pullback φ ⋙ pullback ψ` identifies to the pullback of the composition. We show compatibilites for these isomorphisms: they are deduced from similar identifies for pushforwards (in which case they are `rfl`). --- - [x] depends on: #30335 This PR continues the work from #17589. Original PR: https://github.com/leanprover-community/mathlib4/pull/17589	t-algebra t-algebraic-geometry t-category-theory label:t-algebra$	121/14	Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	8-21700 8 days ago	15-50422 15 days ago	15-50441 15 days
30696	joelriou author:joelriou	feat(Order/Category): `PardOrdEmb` has filtered colimits	--- - [x] depends on: #30693 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	161/2	Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/Order/Category/PartOrdEmb.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	Vierkantor assignee:Vierkantor	8-21696 8 days ago	15-72346 15 days ago	15-72373 15 days
30757	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): `singletonGraph` and `subgraphOfAdj` are trees	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	30/1	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	3	1	['github-actions']	kmill assignee:kmill	8-21694 8 days ago	23-42155 23 days ago	23-42198 23 days
30771	dagurtomas author:dagurtomas	chore(CategoryTheory): move `Closed` directory into `Monoidal`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed	36/36	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Category/Cat/CartesianClosed.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Closed/Enrichment.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Groupoid.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Closed/Types.lean,Mathlib/CategoryTheory/Monoidal/Closed/Zero.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Preadditive/Projective/Internal.lean,Mathlib/CategoryTheory/Sites/CartesianClosed.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/CartesianClosed.lean,Mathlib/Condensed/Light/CartesianClosed.lean	27	3	['github-actions', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	8-21693 8 days ago	16-4913 16 days ago	23-9293 23 days
30826	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): map a walk to its own subgraph	While this is not very interesting on its own, it opens the possibility of mapping a walk to any graph, given a graph homomorphism from the walk's subgraph. --- Related: #30590 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	15/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	1	['github-actions']	b-mehta assignee:b-mehta	8-21691 8 days ago	21-51039 21 days ago	21-51083 21 days
30827	dagurtomas author:dagurtomas	feat(Condensed): constructions for light condensed objects can be done in an equivalent small category	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-condensed	36/2	Mathlib/Condensed/Light/Small.lean	1	1	['github-actions']	joneugster assignee:joneugster	8-21690 8 days ago	21-49832 21 days ago	21-49871 21 days
30877	YaelDillies author:YaelDillies	feat(Algebra/MonoidAlgebra): extend the `R[M]` notation to `MonoidAlgebra R M`	It currently only is notation for `AddMonoidAlgebra R M`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	212/161	Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.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,MathlibTest/Algebra/MonoidAlgebra/Defs.lean	9	17	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	jcommelin assignee:jcommelin	8-21689 8 days ago	16-45429 16 days ago	16-75966 16 days
31054	jsm28 author:jsm28	feat(LinearAlgebra/AffineSpace/Simplex/Basic): faces and `reindex`	Add lemmas about the set of vertices of a `face` or `faceOpposite` of `Simplex.reindex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	14/0	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	1	['github-actions']	kim-em assignee:kim-em	8-21684 8 days ago	15-69240 15 days ago	15-69215 15 days
30595	winstonyin author:winstonyin	feat: $C^n$ implicit function theorem	I formalise a proof that the implicit function obtained from a $C^n$ implicit equation ($n \geq 1$) is $C^n$. Roughly speaking, given an equation $f : E \times F \to F$ that is smooth at $(a,b) : E\times F$ and whose derivative $f'$ is in some sense non-singular, then there exists a function $\phi : E \to F$ such that $\phi(a) = b$, $f(x, \phi(x)) = f(a,b)$ for all $x$ in a neighbourhood of $a$, and $\phi$ is $C^n$ at $a$. The current implicit function theorem in Mathlib is quite general and not directly applicable to many familiar scenarios. The statements added by this PR correspond to, e.g., the way the theorem is described on Wikipedia, and will be directly useful for an upcoming formalisation of the smoothness theorem for flows of ODEs. - [x] depends on: #30607 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	166/2	Mathlib.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/ImplicitContDiff.lean	3	32	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel', 'winstonyin']	grunweg assignee:grunweg	8-6508 8 days ago	8-6530 8 days ago	19-63495 19 days
30678	YaelDillies author:YaelDillies	refactor(Algebra/Quaternion): intermediate `Module` instance	This `Module` instance allows me to not ungeneralise the `NoZeroSMulDivisors R ℍ[R,c₁,c₂,c₃]` in #30563. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	45/28	Mathlib/Algebra/Quaternion.lean	1	20	['YaelDillies', 'eric-wieser', 'github-actions']	joneugster assignee:joneugster	7-79977 7 days ago	24-79039 24 days ago	25-17375 25 days
30120	FernandoChu author:FernandoChu	feat(CategoryTheory): Pullback of equalizer is an equalizer	We show that the pullback of an equalizer (seen as a subobject) along some morphism `h` is the subobject that comes from the equalizer of the two original arrows precomposed with `h`. A `TODO` was completed in the process. This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	large-import t-category-theory	112/2	Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackCone.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Limits.lean	5	11	['FernandoChu', 'dagurtomas', 'github-actions', 'joelriou']	joneugster assignee:joneugster	7-75651 7 days ago	7-75651 7 days ago	34-57406 34 days
31292	janemms author:janemms	feat(Analysis): the Sequential Banach-Alaoglu theorem	Add the sequential Banach-Alaoglu theorem: closed balls of the dual of a separable normed space are sequentially compact in the weak-* topology. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-CI	72/1	Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean	2	3	['YaelDillies', 'github-actions']	nobody	7-75065 7 days ago	8-46420 8 days ago	0-0 0 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/)	t-measure-probability awaiting-author	183/99	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/Indicator.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean	9	23	['JonBannon', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	urkud assignee:urkud	7-61014 7 days ago	7-61864 7 days ago	19-64975 19 days
30416	SnirBroshi author:SnirBroshi	feat(Logic/Relation): lemmas relating `Relation.Map` and `Function.onFun`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	32/0	Mathlib/Logic/Relation.lean	1	1	['github-actions']	awainverse assignee:awainverse	7-59797 7 days ago	34-40497 1 month ago	34-42722 34 days
30041	josephmckinsey author:josephmckinsey	feat(Algebra/Order/Floor): generalize mul_floor_div theorems to rings and semirings	Generalize `mul_cast_floor_div_cancel` from `Field` and `Semifield` to `Ring` and `Semiring`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	43/31	Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semifield.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Analysis/Real/OfDigits.lean	4	11	['Ruben-VandeVelde', 'github-actions', 'josephmckinsey', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	7-53349 7 days ago	7-53371 7 days ago	33-46635 33 days
28100	themathqueen author:themathqueen	feat(LinearAlgebra/GeneralLinearGroup): algebra automorphisms in endomorphisms are inner	Characterization of automorphisms in endomorphisms of vector spaces: for any algebra automorphism `f : End R V ≃ₐ[R] End R V`, there exists a linear isomorphism `T` such that `f a = T.conj a = T ∘ a ∘ T.symm` for all `a`. This does not suppose finite-dimensionality. Also adds an instance for `Algebra.IsCentral K (Module.End K V)`. --- Technically used Aristotle for showing that `T` is injective (out of curiosity) :) (added as co-author) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	122/3	Mathlib.lean,Mathlib/Algebra/Central/End.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Norm.lean,Mathlib/LinearAlgebra/GeneralLinearGroup/AlgEquiv.lean,Mathlib/RingTheory/LocalRing/Module.lean	7	41	['Whysoserioushah', 'eric-wieser', 'github-actions', 'hrmacbeth', 'mathlib4-merge-conflict-bot', 'themathqueen']	Vierkantor assignee:Vierkantor	7-49704 7 days ago	12-58450 12 days ago	46-75290 46 days
26580	vasnesterov author:vasnesterov	feat(Tactic/Order): translate linear orders to `Int`	It was [pointed out](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/tactic.20for.20partial.20orders/near/515897754) that `order` is not complete for linear orders with lattice operations (while it remains complete for linear orders without lattice operations and for general lattices without assuming linearity). The problem for linear orders with lattice operations is NP-hard, but it can be translated from an arbitrary type to `Int` and then solved using a smart and efficient procedure (such as `omega`). This PR implements such a translation within the `order` tactic. Co-authored-by: Aaron Liu --- - [x] depends on: #26354 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	331/43	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Preprocessing.lean,Mathlib/Tactic/Order/ToInt.lean,MathlibTest/order.lean	7	18	['Vierkantor', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vasnesterov']	alexjbest assignee:alexjbest	7-47415 7 days ago	7-48249 7 days ago	123-65797 123 days
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/)	t-ring-theory easy awaiting-author	3/2	Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	2	6	['erdOne', 'github-actions', 'j-loreaux']	nobody	7-46581 7 days ago	7-46581 7 days ago	3-12761 3 days
31287	YaelDillies author:YaelDillies	refactor(SetTheory/ZFC): deduplicate coercion to sets	Currently, we have both `ZFSet.toSet` and `SetLike.coe` to turn a `ZFSet` into a `Set ZFSet`. This is bad for simp normal form. This PR removes the first spelling in favor of the second one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	111/104	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/Ordinal.lean	3	16	['YaelDillies', 'eric-wieser', 'github-actions', 'staroperator']	nobody	7-40484 7 days ago	8-58012 8 days ago	8-58049 8 days
31263	LiranShaul author:LiranShaul	feat: arbitrary product of injective modules is injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra awaiting-author label:t-algebra$	14/0	Mathlib/Algebra/Module/Injective.lean	1	10	['erdOne', 'github-actions', 'joelriou', 'kbuzzard']	nobody	7-38778 7 days ago	9-35133 9 days ago	0-21724 6 hours
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		63/3	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/canonical.lean,lake-manifest.json,lakefile.lean	5	1	['github-actions']	nobody	7-23529 7 days ago	7-23529 7 days ago	0-0 0 seconds
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	7-22440 7 days ago	7-22442 7 days ago	0-0 0 seconds
30962	WangYiran01 author:WangYiran01	feat(Combinatorics/Enumerative): add lattice path lemmas and counts	This PR adds definitions and theorems about monotone lattice paths: - Defines `pathCount`, `pathCountFrom`, `SubdiagProp`, and related structures. - Proves closed forms such as `pathCount_eq_closed`. - Adds Dyck/ballot subdiagonal property (`SubdiagProp`). All code builds successfully with `lake build`.	new-contributor t-combinatorics	64/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/RecLatticePath.lean	2	1	['github-actions']	awainverse assignee:awainverse	7-21703 7 days ago	17-84204 17 days ago	17-84242 17 days
31072	euprunin author:euprunin	golf(Combinatorics/Quiver/Path): golf `exists_eq_comp_and_notMem_tail_of_mem_vertices` using `grind`	--- Show trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices`: 38 ms before, 46 ms after ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` before PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..35d3daa185 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.039993] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.038334] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.036860] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036855] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036851] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e [… 447 lines omitted …] have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014253] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014250] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014246] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014243] ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014240] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this [Elab.step] [0.014235] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this Build completed successfully (521 jobs). ``` ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` after PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..d658dc1eb1 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), @@ -230,18 +231,7 @@ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.ver intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e - have h_no_tail : v ∉ q₂'.vertices.tail := by - intro hmem - have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by - simpa [q₂', vertices_cons, concat_eq_append] using hmem - cases hq2 : q₂.vertices with - \| nil => simp [hq2] at hmem' - \| cons y ys => - have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' - obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in - · exact h_not_tail <\| by simpa [hq2] - · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last - exact hxe_ne this + have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.047236] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.045901] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.044896] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044892] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044888] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => [… 96 lines omitted …] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.029274] refine no_implicit_lambda% (have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025886] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025862] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025858] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025854] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025851] ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025848] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.025842] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.022111] have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] [Elab.step] [0.022085] focus refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022082] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022079] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021564] case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021552] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021549] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021546] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021542] (grind [vertices_cons, end_cons]) [Elab.step] [0.021539] grind [vertices_cons, end_cons] [Elab.step] [0.021535] grind [vertices_cons, end_cons] [Elab.step] [0.021527] grind [vertices_cons, end_cons] Build completed successfully (521 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	1/12	Mathlib/Combinatorics/Quiver/Path/Vertices.lean	1	1	['github-actions']	b-mehta assignee:b-mehta	7-21701 7 days ago	15-32825 15 days ago	15-32865 15 days
31077	peabrainiac author:peabrainiac	feat(Topology): `nhdsSetWithin` filter	Add a relative version `nhdsSetWithin` of `nhdsSet`, analogous to `nhdsWithin`. The main application of this is a slightly more general variant of the tube lemma (`generalized_tube_lemma_left`) that came up while working in analysis files. --- - [x] depends on: #31090 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	159/4	Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Defs/Filter.lean,Mathlib/Topology/NhdsWithin.lean	4	7	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'peabrainiac', 'plp127']	fpvandoorn assignee:fpvandoorn	7-21700 7 days ago	14-46770 14 days ago	14-80093 14 days
31086	kckennylau author:kckennylau	feat(Util): open unscoped	`open unscoped Foo` opens the namespace `Foo` without activating its scope, meaning without activating any of its scoped instances or notations. Example usage: ```lean namespace Nat def pi : Nat := 3 scoped notation "π" => pi end Nat open unscoped Nat #check pi #check π -- error ``` --- Zulip: * [lean4 > Why "scoped notation" for Euler's totient function?](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Why.20.22scoped.20notation.22.20for.20Euler's.20totient.20function.3F/with/547890198) * [mathlib4 > open unscoped](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/open.20unscoped/with/547890545) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	82/0	Mathlib.lean,Mathlib/Util/OpenUnscoped.lean,MathlibTest/Util/OpenUnscoped.lean	3	1	['github-actions']	robertylewis assignee:robertylewis	7-21699 7 days ago	14-76642 14 days ago	14-76677 14 days
31087	joelriou author:joelriou	feat(CategoryTheory/Sites): categories of sheaves on Over categories, as a pseudofunctor	Given a Grothendieck topology `J` on a category `C` and a category `A`, we define the pseudofunctor `J.pseudofunctorOver A : Pseudofunctor (LocallyDiscrete Cᵒᵖ) Cat` which sends `X : C` to the category of sheaves on `Over X` with values in `A`. In order to do this, we expand the API for pushforward of sheaves for continuous functors. We add a few pseudofunctor-like definitions for these pushforwards. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	190/7	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/PseudofunctorSheafOver.lean	5	1	['github-actions']	dagurtomas assignee:dagurtomas	7-21698 7 days ago	14-72910 14 days ago	14-72884 14 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/)	new-contributor t-algebra label:t-algebra$	19/0	Mathlib/Algebra/Group/ForwardDiff.lean	1	9	['FlAmmmmING', 'Ruben-VandeVelde', 'github-actions']	dagurtomas assignee:dagurtomas	7-21697 7 days ago	14-58930 14 days ago	14-58972 14 days
27971	smmercuri author:smmercuri	feat: weak approximation theorems for infinite places of a number field	Under the diagonal embedding into infinite places, a number field $K$ is dense inside both the product $\prod_{v \mid \infty} (K, v)$, where $(K, v)$ denotes $K$ equipped with $v$'s topology, and the infinite adele ring $\prod_v K_v$. This PR continues the work from #22153. Original PR: https://github.com/leanprover-community/mathlib4/pull/22153 --- - [x] depends on: #27969	FLT t-algebra t-number-theory label:t-algebra$	98/2	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	3	8	['faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	Vierkantor assignee:Vierkantor	6-70867 6 days ago	24-83673 24 days ago	42-31819 42 days
30940	jessealama author:jessealama	feat(Data/Set/Image): add Option.range lemmas for elim function	This PR adds two new lemmas about `Option.elim` and `range`: - `Option.range_elim`: characterizes the range of a function defined via `Option.elim` - `Option.image_elim_range_some_eq_range`: the image of `range some` under `Option.elim b f` equals `range f` ## Context These lemmas are part of a larger PR (#30854) that touched multiple areas of Mathlib. Following reviewer suggestions, the PR has been split into smaller, focused contributions. This PR contains only the changes to `Mathlib/Data/Set/Image.lean`. ## Potential Reviewers Based on recent contributions to `Mathlib/Data/Set/Image.lean`: - @euprunin - @plp127	t-data	12/0	Mathlib/Data/Set/Image.lean	1	5	['github-actions', 'jessealama', 'plp127']	nobody	6-65544 6 days ago	18-42053 18 days ago	18-42091 18 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. --- Builds on: #31121 Related to: #29639, #29643, #29646	new-contributor t-algebra awaiting-author label:t-algebra$	525/0	Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean,Mathlib/Algebra/Homology/EulerPoincare.lean	3	22	['github-actions', 'jessealama', 'joelriou', 'kim-em']	dagurtomas assignee:dagurtomas	6-64023 6 days ago	8-54749 8 days ago	37-64248 37 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/)	t-analysis easy awaiting-author documentation	1/1	Mathlib/Analysis/Calculus/Darboux.lean	1	3	['ADedecker', 'dopamine333', 'github-actions']	nobody	6-61795 6 days ago	6-61795 6 days ago	0-21655 6 hours
30976	mariainesdff author:mariainesdff	feat(Data/Nat/Choose/Multinomial): add multinomial_eq_of_support_subset	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	10/0	Mathlib/Data/Nat/Choose/Multinomial.lean	1	n/a	['github-actions', 'robin-carlier']	nobody	6-51491 6 days ago	unknown	unknown
29270	euprunin author:euprunin	chore: remove redundant `refine` invocations	--- Note: Although technically redundant, some of these may be worth keeping for readability, or other reasons. Let me know if you think any should stay. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		4/12	Mathlib/Algebra/Order/GroupWithZero/Lex.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Probability/Density.lean	5	16	['euprunin', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'sgouezel']	dupuisf assignee:dupuisf	6-48967 6 days ago	6-48967 6 days ago	36-39301 36 days
29055	vihdzp author:vihdzp	feat: `Ordinal.toENat`	We essentially copy the Cardinal/ENat file but make it for ordinals instead. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2317758.20Ordinal.2EtoENat/near/479768508) for some prior discussion on this PR (particularly, the duplication and how there's no easy way to resolve it.) --- Moved from #17758. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	292/0	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/ENat.lean	6	8	['github-actions', 'kckennylau']	alreadydone assignee:alreadydone	6-48794 6 days ago	6-48794 6 days ago	71-25577 71 days
30754	Jlh18 author:Jlh18	feat (CategoryTheory/Comma/Over/Pushforward): define pushforwards	Define what it means to be a pushforward, what it means to have pushforwards, and the pullback/pushforward adjunction when all pushforwards exist. This is related to PRs #30375 and PR #29810 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory RFC	99/2	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Comma/Over/Pushforward.lean	3	7	['Jlh18', 'github-actions', 'joelriou', 'sinhp']	adamtopaz assignee:adamtopaz	6-43435 6 days ago	7-56033 7 days ago	22-66999 22 days
30647	JovanGerb author:JovanGerb	chore(Tactic/Ring): use Qq more honestly	This PR removes almost all uses of `(q(...) : Expr)` in the `ring` tactic implementation. This includes switching from `Ring`/`DivisionSemiring` to `CommRing`/`Semifield`, because then we can rely on `assumeInstancesCommute` to make Qq happy. This should not affect the generality of the `ring` tactic, because a `Ring`/`DivisionSemiring` that is also commutative is also a `CommRing`/`Semifield`. I wanted to do some other work on `ring`, but that stumbled on the fact that some `q(...)` proof terms weren't actually being type checked properly by Qq. This PR fixes this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	136/118	Mathlib/Tactic/Ring/Basic.lean	1	12	['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'thorimur']	thorimur assignee:thorimur	6-33885 6 days ago	26-69545 26 days ago	26-69529 26 days
30669	harahu author:harahu	doc(Algebra): fix typos	Found with help from Codex. I've tried to limit the PR to changes that are easy to review. --- Should you find it difficult to review any particular part of this PR, know that I have nothing against trimming this PR down in favor of smaller free-standing PRs for the difficult-to-review parts. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	46/46	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/CharZero/AddMonoidHom.lean,Mathlib/Algebra/Field/Action/ConjAct.lean,Mathlib/Algebra/Field/Power.lean,Mathlib/Algebra/Field/ULift.lean,Mathlib/Algebra/GroupWithZero/Associated.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/ShortExact.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/HomologySequenceLemmas.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/ShortExact.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Lie/Free.lean,Mathlib/Algebra/Lie/InvariantForm.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean,Mathlib/Algebra/SkewMonoidAlgebra/Single.lean,Mathlib/Algebra/Star/NonUnitalSubsemiring.lean	31	1	['github-actions']	kim-em assignee:kim-em	6-27614 6 days ago	25-70192 25 days ago	25-74836 25 days
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/)	large-import new-contributor awaiting-author	70/3	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	15	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	6-26551 6 days ago	6-26588 6 days ago	21-29486 21 days
29776	yuanyi-350 author:yuanyi-350	chore(Functional Analysis) : 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/)	t-analysis awaiting-author WIP	44/24	Mathlib/Analysis/Normed/Operator/Banach.lean	1	12	['faenuccio', 'github-actions', 'kckennylau', 'leanprover-bot', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	6-26487 6 days ago	37-18018 1 month ago	2-46827 2 days
30144	alreadydone author:alreadydone	feat(Data/Nat): kernel reducible binaryRec	+ Redefine `Nat.binaryRec` to allow kernel reduction. + Move some lemmas from Data/Nat/Bitwise to Data/Nat/BinaryRec. + Use `nsmulBinRec` for nsmul/zsmul on elliptic curves. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra label:t-algebra$	90/35	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/BitIndices.lean,Mathlib/Data/Nat/Bitwise.lean	6	8	['alreadydone', 'astrainfinita', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	pechersky assignee:pechersky	6-21713 6 days ago	14-26619 14 days ago	40-23880 40 days
30242	YaelDillies author:YaelDillies	chore: rename `mul_le_mul_right'` to `mul_le_mul_left`	--- - [x] depends on: #30508 - [x] depends on: #30632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	345/379	Archive/Wiedijk100Theorems/CubingACube.lean,Counterexamples/OrderedCancelAddCommMonoidWithBounds.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Int.lean,Mathlib/Algebra/Order/Group/Nat.lean,Mathlib/Algebra/Order/Group/Opposite.lean,Mathlib/Algebra/Order/Group/PiLex.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Associated.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/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Units.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Algebra/Order/Ring/Rat.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/Matrix/Order.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Combinatorics/Additive/Energy.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Kleitman.lean,Mathlib/Computability/Language.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Inv.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Int/Interval.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Nat/Fib/Zeckendorf.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Num/ZNum.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Real/StarOrdered.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/GroupTheory/DivisibleHull.lean,Mathlib/GroupTheory/MonoidLocalization/Order.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/MeasureTheory/Function/Intersectivity.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Add.lean,Mathlib/NumberTheory/EllipticDivisibilitySequence.lean,Mathlib/NumberTheory/FrobeniusNumber.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/Partition/Equipartition.lean,Mathlib/Probability/Independence/Integration.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/HahnSeries/Lex.lean,Mathlib/RingTheory/Valuation/ValuativeRel/Basic.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Divisibility.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Tactic/LinearCombination/Lemmas.lean,Mathlib/Tactic/Ring/Compare.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean	104	13	['JovanGerb', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	6-21712 6 days ago	13-64080 13 days ago	16-63093 16 days
30657	alreadydone author:alreadydone	feat(Algebra): generalize Picard group to Semiring	--- - [x] depends on: #30638 - [x] depends on: #30665 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	33/28	Mathlib/RingTheory/PicardGroup.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	6-21710 6 days ago	13-56492 13 days ago	13-56691 13 days
31113	515801431 author:515801431	feat(Mathlib/Combinatorics/Enumerative/Polya.lean): Add additional theorem in `Polya.lean`	-- depend on #30525 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	298/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	1	['github-actions']	b-mehta assignee:b-mehta	6-21702 6 days ago	14-1541 14 days ago	14-1590 14 days
31132	kckennylau author:kckennylau	Feat(Algebra): saturation of a submonoid	This PR defines the saturation of a submonoid and the type of saturated submonoids. It is used for the context of localisations. Caveat: there is a similarly named predicate called `AddSubgroup.Saturated`. Zulip: * [mathlib4 > saturation of a submonoid](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/saturation.20of.20a.20submonoid/with/548242862) * [#Is there code for X? > Closure of Submonoid in CommMonoids](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Closure.20of.20Submonoid.20in.20CommMonoids/near/419087778) --- [![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/Group/Submonoid/Saturation.lean	2	11	['github-actions', 'kckennylau', 'plp127']	kim-em assignee:kim-em	6-21698 6 days ago	13-32891 13 days ago	13-32925 13 days
28719	mitchell-horner author:mitchell-horner	refactor: redefine `IsTuranMaximal`	Redefined `IsTuranMaximal := G.IsExtremal (CliqueFree · (r + 1))` and - replaced `classical` in `IsTuranMaximal.le_iff_eq` with `DecidableRel` - refactored `turanGraph.instDecidableRelAdj`, `turanGraph_zero`, `exists_isTuranMaximal` - added `open Fintype` - replaced `simp only` with `rw` or `simp_rw` --- - [x] depends on: #28721 - [x] depends on: #29054 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	33/46	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	12	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vihdzp']	kmill assignee:kmill	6-12429 6 days ago	46-81707 1 month ago	74-14425 74 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/)	t-data new-contributor awaiting-author	22/0	Mathlib/Data/Rat/Lemmas.lean	1	33	['github-actions', 'kim-em', 'mathlib-bors', 'pechersky', 'sinianluoye', 'themathqueen']	pechersky assignee:pechersky	6-8067 6 days ago	18-14575 18 days ago	80-3629 80 days
30047	ooovi author:ooovi	feat(Combinatorics/SimpleGraph): edge labellings	Add edge labellings for `SimpleGraph` as well as some basic lemmata. --- This is mostly a cleaned up part of @b-mehta's lean4 port of their [formalisation of an exponentially better upper bound on Ramsey numbers ](https://github.com/b-mehta/ExponentialRamsey/). I need these definitions for another project on Ramsey theory. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-combinatorics awaiting-author	234/3	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/EdgeLabelling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean	5	52	['YaelDillies', 'b-mehta', 'github-actions', 'ooovi', 'vlad902']	b-mehta assignee:b-mehta	6-4257 6 days ago	9-83378 9 days ago	34-69915 34 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/)	t-data awaiting-author	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	30	['IvanRenison', 'b-mehta', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	b-mehta assignee:b-mehta	5-70882 5 days ago	169-10989 5 months ago	73-73341 73 days
31101	emilyriehl author:emilyriehl	feat(Algebraic Topology): the strict bicategory of quasicategories	The category of quasicategories, defined as a full subcategory of simplicial sets, may be extended to a strict bicategory whose objects are quasicategories, 1-cells are maps of simplicial sets, and 2-cells are homotopy classes of homotopies between such maps. Co-authored by [Mario Carneiro](https://github.com/digama0) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology infinity-cosmos t-category-theory awaiting-author	159/9	Mathlib.lean,Mathlib/AlgebraicTopology/Quasicategory/StrictBicategory.lean,Mathlib/AlgebraicTopology/SimplicialCategory/SimplicialObject.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Functor/FunctorHom.lean,Mathlib/CategoryTheory/Quotient.lean,docs/references.bib	9	22	['bryangingechen', 'dagurtomas', 'emilyriehl', 'github-actions', 'joelriou']	nobody	5-68637 5 days ago	5-68718 5 days ago	7-16461 7 days
31201	euprunin author:euprunin	chore(RingTheory): golf `isPrimary_decomposition_pairwise_ne_radical` using `grind`	--- Show trace profiling of `isPrimary_decomposition_pairwise_ne_radical`: 89 ms before, 156 ms after ### Trace profiling of `isPrimary_decomposition_pairwise_ne_radical` before PR 31201 ```diff diff --git a/Mathlib/RingTheory/Lasker.lean b/Mathlib/RingTheory/Lasker.lean index 8f522d48f8..21bf4d68b6 100644 --- a/Mathlib/RingTheory/Lasker.lean +++ b/Mathlib/RingTheory/Lasker.lean @@ -57,6 +57,7 @@ lemma decomposition_erase_inf [DecidableEq (Ideal R)] {I : Ideal R} open scoped Function -- required for scoped `on` notation +set_option trace.profiler true in lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ ``` ``` ℹ [1261/1261] Built Mathlib.RingTheory.Lasker (1.3s) info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.013044] theorem isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.definition.header] [0.010071] Ideal.isPrimary_decomposition_pairwise_ne_radical info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.016459] lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.async] [0.091697] elaborating proof of Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.definition.value] [0.089099] Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.step] [0.086924] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.086918] classical [… 154 lines omitted …] Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK [Elab.step] [0.020717] rw [← hs] refine le_antisymm ?_ ?_ <;> intro x hx · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ intro J _ K hK _ exact hx K hK [Elab.step] [0.010102] · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.010064] simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.010060] simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ intro J hJ exact hx J hJ J hJ rfl [Elab.step] [0.015365] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.015273] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.015268] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.027960] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.027947] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.027944] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014324] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014317] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.014310] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] Build completed successfully (1261 jobs). ``` ### Trace profiling of `isPrimary_decomposition_pairwise_ne_radical` after PR 31201 ```diff diff --git a/Mathlib/RingTheory/Lasker.lean b/Mathlib/RingTheory/Lasker.lean index 8f522d48f8..6f1c39f8a7 100644 --- a/Mathlib/RingTheory/Lasker.lean +++ b/Mathlib/RingTheory/Lasker.lean @@ -57,6 +57,7 @@ lemma decomposition_erase_inf [DecidableEq (Ideal R)] {I : Ideal R} open scoped Function -- required for scoped `on` notation +set_option trace.profiler true in lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ @@ -64,16 +65,8 @@ lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ - · rw [← hs] - refine le_antisymm ?_ ?_ <;> intro x hx - · simp only [Finset.inf_image, CompTriple.comp_eq, Submodule.mem_finsetInf, - Function.comp_apply, Finset.mem_filter, id_eq, and_imp] at hx ⊢ - intro J hJ - exact hx J hJ J hJ rfl - · simp only [Submodule.mem_finsetInf, id_eq, Finset.inf_image, CompTriple.comp_eq, - Function.comp_apply, Finset.mem_filter, and_imp] at hx ⊢ - intro J _ K hK _ - exact hx K hK + · ext + grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ ``` ``` ℹ [1261/1261] Built Mathlib.RingTheory.Lasker (1.2s) info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.011121] theorem isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.command] [0.012898] lemma isPrimary_decomposition_pairwise_ne_radical {I : Ideal R} {s : Finset (Ideal R)} (hs : s.inf id = I) (hs' : ∀ ⦃J⦄, J ∈ s → J.IsPrimary) : ∃ t : Finset (Ideal R), t.inf id = I ∧ (∀ ⦃J⦄, J ∈ t → J.IsPrimary) ∧ (t : Set (Ideal R)).Pairwise ((· ≠ ·) on radical) := by classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] info: Mathlib/RingTheory/Lasker.lean:61:0: [Elab.async] [0.157957] elaborating proof of Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.definition.value] [0.156050] Ideal.isPrimary_decomposition_pairwise_ne_radical [Elab.step] [0.154194] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.154189] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.154184] classical refine ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ · ext grind [Finset.inf_image, Submodule.mem_finsetInf] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, [… 59 lines omitted …] ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ [Elab.step] [0.017062] expected type: ∃ t, t.inf id = I ∧ (∀ ⦃J : Ideal R⦄, J ∈ t → J.IsPrimary) ∧ (↑t).Pairwise ((fun x1 x2 ↦ x1 ≠ x2) on radical), term ⟨(s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id, ?_, ?_, ?_⟩ [Elab.step] [0.017043] expected type: ∃ t, t.inf id = I ∧ (∀ ⦃J : Ideal R⦄, J ∈ t → J.IsPrimary) ∧ (↑t).Pairwise ((fun x1 x2 ↦ x1 ≠ x2) on radical), term Exists.intro✝ ((s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id) ⟨?_, ?_, ?_⟩ [Elab.step] [0.016253] expected type: Finset (Ideal R), term (s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})).image fun t ↦ t.inf id [Elab.step] [0.013756] expected type: , term (s.image (fun J ↦ {I ∈ s \| I.radical = J.radical})) [Elab.step] [0.013751] expected type: , term s.image (fun J ↦ {I ∈ s \| I.radical = J.radical}) [Elab.step] [0.011627] expected type: ?m.44 → Finset (Ideal R), term (fun J ↦ {I ∈ s \| I.radical = J.radical}) [Elab.step] [0.011622] expected type: ?m.44 → Finset (Ideal R), term fun J ↦ {I ∈ s \| I.radical = J.radical} [Elab.step] [0.011555] expected type: Finset (Ideal R), term {I ∈ s \| I.radical = J.radical} [Elab.step] [0.090158] · ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.090093] ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.090089] ext grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.089120] grind [Finset.inf_image, Submodule.mem_finsetInf] [Elab.step] [0.014619] · simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.014610] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.014605] simp only [Finset.mem_image, exists_exists_and_eq_and, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro J hJ refine isPrimary_finset_inf (i := J) ?_ ?_ (by simp) · simp [hJ] · simp only [Finset.mem_filter, id_eq, and_imp] intro y hy simp [hs' hy] [Elab.step] [0.026753] · intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.026740] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.026737] intro I hI J hJ hIJ simp only [Finset.coe_image, Set.mem_image, Finset.mem_coe, exists_exists_and_eq_and] at hI hJ obtain ⟨I', hI', hI⟩ := hI obtain ⟨J', hJ', hJ⟩ := hJ simp only [Function.onFun, ne_eq] contrapose! hIJ suffices I'.radical = J'.radical by rw [← hI, ← hJ, this] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013805] · rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013799] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] [Elab.step] [0.013796] rw [← hI, radical_finset_inf (i := I') (by simp [hI']) (by simp), id_eq] at hIJ rw [hIJ, ← hJ, radical_finset_inf (i := J') (by simp [hJ']) (by simp), id_eq] Build completed successfully (1261 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	2/10	Mathlib/RingTheory/Lasker.lean	1	2	['erdOne', 'github-actions']	nobody	5-67928 5 days ago	5-67928 5 days ago	11-40100 11 days
30727	joelriou author:joelriou	feat(CategoryTheory/Presentable): presentable objects in `Type`	In this file, we show that if `κ : Cardinal.{u}` is a regular cardinal, then `X : Type u` is `κ`-presentable in the category of types iff `HasCardinalLT X κ` holds. --- - [x] depends on: #30633 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	141/0	Mathlib.lean,Mathlib/CategoryTheory/Presentable/Type.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	5-33035 5 days ago	5-33295 5 days ago	15-69892 15 days
30795	joelriou author:joelriou	feat(CategoryTheory): final functors from a `κ`-filtered category	If `F : J₁ ⥤ J₂` is final and `J₁` is `κ`-filtered, then so is `J₂`. --- - [x] depends on: #30781 - [x] depends on: #30633 - [x] depends on: #30634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory WIP	28/1	Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-30083 5 days ago	5-30103 5 days ago	0-11 11 seconds
27258	JovanGerb author:JovanGerb	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	335/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	10	['JovanGerb', 'dwrensha', 'github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	5-29966 5 days ago	52-53795 1 month ago	52-55072 52 days
29147	ocfnash author:ocfnash	feat: miscellaneous root system lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	73/34	Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean	4	2	['github-actions', 'ocfnash']	dagurtomas assignee:dagurtomas	5-21700 5 days ago	12-59549 12 days ago	12-59523 12 days
31118	LLaurance author:LLaurance	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): the path of a walk is a subgraph of the walk itself	Add helper theorems for https://github.com/leanprover-community/mathlib4/pull/29309 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	19/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean	1	2	['SnirBroshi', 'github-actions']	b-mehta assignee:b-mehta	5-21700 5 days ago	13-76280 13 days ago	13-77990 13 days
30559	SnirBroshi author:SnirBroshi	feat(Data/Sym/Sym2): add `Sym2.diagSet`	feat(Data/Sym/Sym2): add `Sym2.diagSet`, the set of elements on the diagonal --- This should help state theorems in simple graphs more easily (e.g. see `SimpleGraph.edgeSet_fromEdgeSet`, `SimpleGraph.edgeSet_eq_iff`, `SimpleGraph.edgeSet_sdiff_sdiff_isDiag`, `SimpleGraph.edgeSet_subset_setOf_not_isDiag`) and more importantly work with such statements. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	42/5	Mathlib/Data/Sym/Sym2.lean	1	1	['github-actions']	nobody	5-19011 5 days ago	30-36560 30 days ago	30-36596 30 days
28557	ShreckYe author:ShreckYe	feat(Data/Nat/Factorization): some results on equality of powers of naturals proved from factorization	I came across some math olympiad problems in number theory that could benefit from these theorems, expecially those on the prime power equality `p ^ m = a ^ n`. A specialized `eq_of_factorization_eq'` is added BTW to help with proof search.	t-data	96/0	Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean	3	22	['Ruben-VandeVelde', 'ShreckYe', 'github-actions', 'robin-carlier']	pechersky assignee:pechersky	5-11776 5 days ago	5-20480 5 days ago	84-58965 84 days
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/)	t-analysis awaiting-author	103/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Order.lean	2	36	['ChrisHughes24', 'EtienneC30', 'b-mehta', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	hrmacbeth assignee:hrmacbeth	5-10834 5 days ago	9-44191 9 days ago	85-25442 85 days
29449	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): add Turán density related theorems	Refactors `tendsto_turanDensity` and implements `turanDensity_eq_sInf` and `isContained_of_card_edgeFinset` (theorems that are common in proofs involving Turán density). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	134/22	Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean,Mathlib/Data/Set/Image.lean,Mathlib/Topology/Instances/NNReal/Lemmas.lean	3	15	['YaelDillies', 'github-actions', 'mitchell-horner']	YaelDillies assignee:YaelDillies	5-10256 5 days ago	5-10256 5 days ago	64-36181 64 days
31416	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Walk): lemmas about the first and last darts/edges	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	43/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	nobody	4-83225 4 days ago	4-83227 4 days ago	4-83260 4 days
30232	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Subgraph): add `ConnectedComponent.toSubgraph`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	43/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean	3	20	['SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	4-81236 4 days ago	4-81260 4 days ago	38-61174 38 days
31418	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): impl `Iso.degree_eq` and `Iso.minDegree_eq` and `Iso.maxDegree_eq`	Move `Iso.card_edgeFinset_eq` further down in Finite.lean and implement: - `Iso.degree_eq` - `Iso.minDegree_eq` - `Iso.maxDegree_eq` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	51/12	Mathlib/Combinatorics/SimpleGraph/Finite.lean	1	1	['github-actions']	nobody	4-73201 4 days ago	4-73475 4 days ago	4-73499 4 days
27602	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define `CompleteBipartiteSubgraph`	Define the complete bipartite subgraphs of `s` and `t` parts as a "left" subset of `s` vertices and a "right" subset of `t` vertices such that every vertex in the "left" subset is adjacent to every vertex in the "right" subset. In this case `Nonempty (G.CompleteBipartiteSubgraph (card α) (card β))` is equivalent to `completeBipartiteGraph α β ⊑ G`, that is, finding a "left" subset of `s` vertices and a "right" subset of `t` vertices such that every vertex in the "left" subset is adjacent to every vertex in the "right" subset is equivalent to finding an injective homomorphism `completeBipartiteGraph α β` to `G`. --- - [x] depends on: #30287 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	93/0	Mathlib/Combinatorics/SimpleGraph/Bipartite.lean	1	18	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner', 'vlad902']	YaelDillies assignee:YaelDillies	4-72591 4 days ago	4-72611 4 days ago	73-3553 73 days
31423	harahu author:harahu	doc(Combinatorics): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `Combinatorics` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually should be. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. I have used my own judgement to decide whether to demote the extra H1 headers to H2 or H3. I've also tried to ensure that any intended header hierarchy is maintained, by further demoting existing H2 comments to H3 where applicable. I ask reviewers to verify that my choices makes sense to them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	20/22	Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Stirling.lean,Mathlib/Combinatorics/Matroid/Circuit.lean,Mathlib/Combinatorics/Matroid/Minor/Contract.lean,Mathlib/Combinatorics/Matroid/Minor/Delete.lean,Mathlib/Combinatorics/Matroid/Minor/Order.lean,Mathlib/Combinatorics/Matroid/Rank/Cardinal.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Combinatorics/Matroid/Rank/Finite.lean	9	1	['github-actions']	nobody	4-70961 4 days ago	4-70977 4 days ago	4-71009 4 days
27599	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define `CompleteEquipartiteSubgraph`	Define the complete equipartite subgraphs in `r` parts each of size `t` in `G` as the `r` subsets of vertices each of size `t` such that vertices in distinct subsets are adjacent. In this case `Nonempty (G.CompleteEquipartiteSubgraph r t)` is equivalent to `completeEquipartiteGraph r t ⊑ G`, that is, finding `r` subsets of vertices each of size `t` in `G` such that vertices in distinct subsets are adjacent is equivalent to finding an injective homomorphism from `completeEquipartiteGraph r t` to `G`. --- - [x] depends on: #27597 - [x] depends on: #30287 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	117/7	Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean	1	24	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mitchell-horner']	YaelDillies assignee:YaelDillies	4-68720 4 days ago	4-72232 4 days ago	44-54133 44 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	195/0	Mathlib.lean,Mathlib/RingTheory/Coalgebra/Frobenius.lean	2	4	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	alreadydone assignee:alreadydone	4-66509 4 days ago	4-66509 4 days ago	15-3966 15 days
30987	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/SpecialLinearGroup): special linear group of a module	Define the special linear group of a module. Relate it with `Matrix.SpecialLinearGroup`. Several additional constructions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	467/14	Mathlib.lean,Mathlib/LinearAlgebra/Charpoly/BaseChange.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Dual.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	8	44	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'mattrobball', 'mcdoll', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	4-65555 4 days ago	16-22570 16 days ago	16-71611 16 days
26710	metakunt author:metakunt	feat (Data/Nat/Digits/Lemmas): Add digits_getD	Adds digits_getD, an explicit computation of the i-th digits of n in base b representation.	t-data new-contributor	15/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	19	['github-actions', 'metakunt', 'pechersky', 'plp127']	nobody	4-64461 4 days ago	6-2161 6 days ago	62-82654 62 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/)		348/338	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	7	['JovanGerb', 'github-actions', 'jsm28']	robertylewis assignee:robertylewis	4-62649 4 days ago	20-65917 20 days ago	20-65890 20 days
31055	jsm28 author:jsm28	feat(Geometry/Euclidean/Projection): `orthogonalProjectionSpan_congr`	Add a congruence lemma for `orthogonalProjectionSpan` applied to two simplices with the same set of vertices, analogous to and proved using `orthogonalProjection_congr`, and a variant `orthogonalProjectionSpan_reindex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	10/0	Mathlib/Geometry/Euclidean/Projection.lean	1	3	['JovanGerb', 'github-actions']	JovanGerb assignee:JovanGerb	4-61165 4 days ago	4-61165 4 days ago	15-68951 15 days
30618	wwylele author:wwylele	feat(Combinatorics): Glaisher's theorem	This proves Glaisher's theorem, one of the 1000+ theorems. It is also a generalization of [Euler's partition theorem](https://github.com/leanprover-community/mathlib4/blob/master/Archive/Wiedijk100Theorems/Partition.lean), which can be rewritten as a collorary of this (will be in a different PR) --- - [ ] depends on: #30599 - [ ] depends on #30567 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	533/15	Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Enumerative/Partition.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/Combinatorics/Enumerative/Partition/Glaisher.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/Order.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean,Mathlib/Topology/Algebra/InfiniteSum/Ring.lean,docs/1000.yaml	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-59312 4 days ago	4-59315 4 days ago	4-61792 4 days
31436	erdOne author:erdOne	not-a-pr: for cache	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	475/23	Mathlib.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/Normal/Closure.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/Defs.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean	12	1	['github-actions']	nobody	4-57967 4 days ago	4-57974 4 days ago	0-0 0 seconds
28346	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): rank functions for pairings	This PR introduces the type of (weak) rank functions for pairings, a notion introduced by Sean Moss, Another approach to the Kan-Quillen model structure. Rank functions can be used in order to show that certain pairings are regular (i.e. the ancestrality relation is well founded). In a future PR, it shall be shown that a regular pairing admits a rank function to the natural numbers, which shall be used to show that the corresponding inclusion of simplicial sets is a (strong) anodyne extension. --- - [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	174/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-57307 4 days ago	unknown	unknown
30860	FormulaRabbit81 author:FormulaRabbit81	feat(Measure): prove the space of probability measures on a compact space is compact	--- - [x] depends on: #30845 - [x] depends on: #28061 [working off this branch] - [ ] depends on #31292 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import WIP	200/22	Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/NNReal.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean	2	4	['FormulaRabbit81', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-52254 4 days ago	5-53245 5 days ago	0-474 7 minutes
31097	joelriou author:joelriou	feat(AlgebraicTopology): the model category structure on Over categories	If `C` is a model category, then for any `X : C`, the category `Over X` is also a model category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	218/5	Mathlib.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/AlgebraicTopology/ModelCategory/Over.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/LiftingProperties/Over.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/MorphismProperty/FunctorCategory.lean,Mathlib/CategoryTheory/MorphismProperty/Retract.lean,Mathlib/CategoryTheory/Retract.lean	10	2	['github-actions', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	4-52208 4 days ago	4-52228 4 days ago	14-40000 14 days
31140	b-mehta author:b-mehta	chore(Data/Int/GCD): review API	This PR makes a few changes, but they are very linked so a single PR seems easiest: - Rename `Nat.exists_mul_emod_eq_gcd` to `Nat.exists_mul_mod_eq_gcd`, and `Nat.exists_mul_emod_eq_one_of_coprime` to `Nat.exists_mul_mod_eq_one_of_coprime`. This is since the `%` operator on naturals is only ever named `mod`, whereas `emod` is reserved for the `%` operator on integers. - Strengthen the statements of those two to additionally deduce that `m < k`. - Add `exists_mul_mod_eq_of_coprime`, which is the non-one generalisation of `exists_mul_mod_eq_one_of_coprime`.	t-data	25/13	Mathlib/Data/Int/GCD.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/RingTheory/RootsOfUnity/CyclotomicUnits.lean	3	1	['github-actions']	nobody	4-50007 4 days ago	13-17239 13 days ago	13-17282 13 days
31313	plp127 author:plp127	feat(HasSumUniformlyOn): generalize theorem	Drop the `T2Space` assumption which was never really needed in `MultipliableUniformlyOn.hasProdUniformlyOn` and `SummableUniformlyOn.hasSumUniformlyOn`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	76/34	Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean,Mathlib/Topology/UniformSpace/LocallyUniformConvergence.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean	3	14	['CoolRmal', 'erdOne', 'github-actions', 'loefflerd', 'plp127']	nobody	4-48841 4 days ago	4-48841 4 days ago	2-29795 2 days
31431	harahu author:harahu	doc(Data): misc. improvements	This PR fixes a batch of typos in the `Data` subdirectory. Found and fixed with help from Codex. As part of this work, we also demote some headers that shouldn't have been H1. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	12/20	Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean	3	6	['github-actions', 'grunweg', 'harahu', 'metakunt']	nobody	4-46777 4 days ago	4-64737 4 days ago	4-64774 4 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/)	t-algebra 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	29	['github-actions', 'kckennylau', 'llllvvuu', 'mathlib4-dependent-issues-bot']	joelriou assignee:joelriou	4-31957 4 days ago	4-31957 4 days ago	17-42383 17 days
22782	alreadydone author:alreadydone	feat(Topology): étalé space associated to a predicate on sections	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	886/160	Mathlib.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	10	16	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	PatrickMassot assignee:PatrickMassot	4-26709 4 days ago	100-26350 3 months ago	30-3459 30 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/)	t-algebra label:t-algebra$	74/0	Mathlib/RingTheory/Localization/Away/Basic.lean	1	17	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp']	kim-em assignee:kim-em	4-21699 4 days ago	186-26093 6 months ago	252-26062 252 days
31144	YaelDillies author:YaelDillies	feat: transfer `FaithfulSMul`/`NoZeroSMulDivisors` along equivs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	26/1	Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Module/TransferInstance.lean	2	11	['YaelDillies', 'erdOne', 'github-actions']	kim-em assignee:kim-em	4-21696 4 days ago	11-54960 11 days ago	12-6393 12 days
31194	grunweg author:grunweg	feat: add `#check'` command and tactic, which only show explicit arguments	In some areas (such as differential geometry), many lemmas have a lot of implicit and typeclass arguments. Using `#check foo` to determine which explicit arguments are expected for a given lemma gives output which is painful to read, because the explicit argument is buried among many lines of other output. The `#check'` command and tactic produce very similar output, but with implicit and typeclass arguments omitted. This increases usability a lot. In the future, this could (and should) be unified to the #check command in core, by becoming e.g. `#check +only-explicit`. Until then, let us add this to mathlib to facilitate experimentation of the most useful behaviour. From the project towards geodesics and the Levi-Civita connection. Co-authored-by: Kyle Miller Co-authored-by: Patrick Massot --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	151/11	Mathlib/Tactic/Check.lean,MathlibTest/Check.lean	2	2	['github-actions', 'grunweg']	thorimur assignee:thorimur	4-21693 4 days ago	11-51374 11 days ago	11-51355 11 days
31199	YaelDillies author:YaelDillies	feat: recursion principle for `Mᵐ⁰`	From ClassFieldTheory Co-authored-by: Kenny Lau --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT t-algebra label:t-algebra$	17/0	Mathlib/Algebra/GroupWithZero/WithZero.lean	1	3	['YaelDillies', 'eric-wieser', 'github-actions']	dagurtomas assignee:dagurtomas	4-21692 4 days ago	11-43977 11 days ago	11-44015 11 days
31204	jsm28 author:jsm28	feat(LinearAlgebra/AffineSpace/Combination): `affineCombination_mem_affineSpan_image`	Add a lemma giving a condition for an affine combination to lie in the affine span of a subset of the indexed family of points (the reverse direction of `eq_affineCombination_of_mem_affineSpan_image`, which is the only current `image` lemma in this file, roughly). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	19/0	Mathlib/LinearAlgebra/AffineSpace/Combination.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	4-21691 4 days ago	11-30951 11 days ago	11-30926 11 days
31206	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): bound coordinates of the incenter	`inv_height_lt_sum_inv_height`, used to prove existence of the excenter opposite a vertex, has a remark in the docstring about what it also implies about the location of the incenter. Change this to an actual lemma `excenterWeights_empty_lt_inv_two` (which I think is the most natural form for that information that can then be applied further in any context where this information is useful). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	16/2	Mathlib/Geometry/Euclidean/Incenter.lean	1	1	['github-actions']	JovanGerb assignee:JovanGerb	4-21690 4 days ago	11-30018 11 days ago	11-29993 11 days
12632	urkud author:urkud	feat(List/OffDiag): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	134/13	Mathlib.lean,Mathlib/Data/List/Count.lean,Mathlib/Data/List/Enum.lean,Mathlib/Data/List/InsertIdx.lean,Mathlib/Data/List/OffDiag.lean,Mathlib/Data/List/Perm/Basic.lean	6	3	['eric-wieser', 'github-actions', 'urkud']	nobody	4-1089 4 days ago	4-1159 4 days ago	0-0 0 seconds
30548	fbarroero author:fbarroero	feat(Analysis/Polynomial/MahlerMeasure): the Mahler measure of a linear polynomial and applications	We prove `` theorem logMahlerMeasure_X_sub_C (z : ℂ) : (X - C z).logMahlerMeasure = log⁺ ‖z‖ `` and `` theorem logMahlerMeasure_eq_log_leadingCoeff_add_sum_log_roots (p : ℂ[X]) : p.logMahlerMeasure = log ‖p.leadingCoeff‖ + ((p.roots).map (fun a ↦ log⁺ ‖a‖)).sum `` --- - [x] depends on: #30681 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis t-number-theory awaiting-author	144/3	Mathlib/Analysis/Polynomial/MahlerMeasure.lean	1	19	['MichaelStollBayreuth', 'copilot-pull-request-reviewer', 'fbarroero', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	3-83581 3 days ago	3-83581 3 days ago	21-32013 21 days
31462	ScottCarnahan author:ScottCarnahan	feat (Algebra/Lie/Extension): 2-cocycle from a Lie algebra extension with abelian kernel and a linear splitting	This PR defines the Lie algebra 2-cocycle of a Lie algebra extension with abelian kernel equipped with a linear splitting. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	219/12	Mathlib/Algebra/Lie/Abelian.lean,Mathlib/Algebra/Lie/Extension.lean	2	1	['github-actions']	ocfnash assignee:ocfnash	3-78648 3 days ago	3-79730 3 days ago	3-79731 3 days
28248	YaelDillies author:YaelDillies	feat: expectation and (conditional) variance of a Bernoulli random variable	Compute the expectation, variance, conditional variance of a Bernoulli random variable. From MiscYD --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	240/0	Mathlib.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/Probability/Bernoulli.lean,Mathlib/Probability/HasLaw.lean,Mathlib/Probability/Moments/Variance.lean	6	35	['DavidLedvinka', 'RemyDegenne', 'YaelDillies', 'github-actions', 'kex-y', 'mathlib4-merge-conflict-bot', 'pfaffelh', 'themathqueen']	kex-y assignee:kex-y	3-77158 3 days ago	3-77176 3 days ago	28-39091 28 days
30988	erdOne author:erdOne	feat(AlgebraicGeometry): descending affine cover of an inverse limit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry	347/35	Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/IsIso.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/QuasiAffine.lean,Mathlib/AlgebraicGeometry/Sites/MorphismProperty.lean,Mathlib/Topology/LocalAtTarget.lean	8	21	['chrisflav', 'erdOne', 'github-actions']	alexjbest assignee:alexjbest	3-75395 3 days ago	7-34104 7 days ago	16-83465 16 days
31439	EtienneC30 author:EtienneC30	WIP: generalize order lemmas about submartingales	--- From BrownianMotion [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	43/17	Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/Probability/Martingale/Basic.lean	3	1	['github-actions']	nobody	3-74203 3 days ago	4-50187 4 days ago	0-0 0 seconds
30348	RemyDegenne author:RemyDegenne	feat: convergence in probability implies convergence in distribution	Prove that convergence in probability implies convergence in distribution, as well as Slutsky's theorem on the convergence of a product of random variables (since those two facts follow from the same lemma). --- - [x] depends on: #30346 - [x] depends on: #30385 - [x] depends on: #30402 - [x] depends on: #30540 - [x] depends on: #30585 - [x] depends on: #30742 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	256/2	Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,docs/1000.yaml	5	21	['EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	EtienneC30 assignee:EtienneC30	3-73950 3 days ago	5-39657 5 days ago	13-8259 13 days
30140	chrisflav author:chrisflav	feat(AlgebraicGeometry): locally directed colimits in `P.Over ⊤ S`	We lift the colimit properties of `Scheme` to `P.Over ⊤ S` if `IsLocalAtSource P`. In particular, `P.Over ⊤ S` has pushouts along open immersions and (small) coproducts. We also add two instances, that make ``` example {U X Y : Scheme.{u}} (f : U ⟶ X) (g : U ⟶ Y) [IsOpenImmersion f] [IsOpenImmersion g] : HasPushout f g := inferInstance ``` work. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	170/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/LimitsOver.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean	6	10	['chrisflav', 'erdOne', 'github-actions', 'joelriou']	alexjbest assignee:alexjbest	3-73307 3 days ago	3-73307 3 days ago	36-70872 36 days
27306	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	This PR continues the work from #22196. Original PR: https://github.com/leanprover-community/mathlib4/pull/22196	t-meta	810/2	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	13	['JovanGerb', 'github-actions', 'grunweg', 'xyzw12345']	JovanGerb assignee:JovanGerb	3-66586 3 days ago	66-12304 2 months ago	113-65777 113 days
30171	smmercuri author:smmercuri	feat(DedekindDomain/AdicValuation): `le_one` lemmas for `HeightOneSpectrum.valuation` and specialisations to `Rat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	48/0	Mathlib/RingTheory/Coprime/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Operations.lean	3	7	['erdOne', 'github-actions', 'smmercuri']	erdOne assignee:erdOne	3-66548 3 days ago	41-52652 1 month ago	41-52680 41 days
31036	chrisflav author:chrisflav	chore(RingTheory): prerequisites for #31034	In particular, various lemmas on `Submodule.comap` for injective maps, lemmas about `Extension.Cotangent.mk` and a criterion for `IsLocalization.Away` for quotients. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	90/0	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Localization/Away/Basic.lean	6	13	['chrisflav', 'erdOne', 'github-actions']	erdOne assignee:erdOne	3-64206 3 days ago	3-65112 3 days ago	11-22012 11 days
31467	maix00 author:maix00	feat(Combinatorics/SimpleGraph): add simp lemma `getVert_map` for `Walk.map`	feat(Combinatorics/SimpleGraph) add simp lemma `getVert_map` to `Walk.map`; set longFile simple fact but can only be proved by reverting the start point of the walk due to the inductive definition --- - in concept similar to `List.getElem_map` - deserve a simp lemma (useful when pushing walks between Subgraphs) lemma getVert_map (i : ℕ) : (p.map f).getVert i = f (p.getVert i) := by revert u; induction i with \| zero => simp \| succ => intro _ p; cases p <;> simp [*] can not just use simp to prove this fact	new-contributor t-combinatorics	6/0	Mathlib/Combinatorics/SimpleGraph/Walk.lean	1	1	['github-actions']	nobody	3-64187 3 days ago	3-64199 3 days ago	3-64236 3 days
30797	adamtopaz author:adamtopaz	feat(Mathlib/Tactic/CategoryStar): Category*	We introduce `Category`, an elaborator for introducing category instances which behaves analogously to `Type`. Specifically, when writing `Category* C` this elaborator does the following: 1. It creates a new universe parameter `v`, and the elaborated term becomes `Category.{v} C`. 2. It places `v` just before the universe parameters appearing in `C` or its type, as commonly done in the category theory library. Basic usage: ```lean variable (C : Type) [Category C] variable (D : Type) [Category D] ``` This is essentially equivalent to: ```lean universe v_1 u_1 variable (C : Type u_1) [Category.{v_1} C] universe v_2 u_2 variable (D : Type u_2) [Category.{v_2} D] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	229/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/CategoryStar.lean,MathlibTest/CategoryTheory/CategoryStar.lean	4	26	['JovanGerb', 'adamtopaz', 'github-actions', 'mattrobball']	thorimur assignee:thorimur	3-63402 3 days ago	22-34577 22 days ago	22-35373 22 days
26231	chrisflav author:chrisflav	feat(CategoryTheory/Sites): sheaf condition and coproducts	We show that under suitable conditions, checking that a presheaf is a sheaf for a covering is equivalent to checking it on the single object covering by the coproduct. --- I am not sure this is the correct file, but I had no better idea. Happy to move it somewhere else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	58/0	Mathlib/CategoryTheory/Sites/Sheaf.lean	1	3	['chrisflav', 'github-actions', 'joelriou']	nobody	3-62604 3 days ago	144-77539 4 months ago	1-60053 1 day
31001	gasparattila author:gasparattila	fix(Tactic/FunProp): fix "loose bvar in expression" error	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	16/1	Mathlib/Tactic/FunProp/Core.lean,MathlibTest/fun_prop_dev.lean	2	13	['gasparattila', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'thorimur']	thorimur assignee:thorimur	3-62198 3 days ago	6-31382 6 days ago	16-71966 16 days
31308	alreadydone author:alreadydone	feat(RingTheory): `Module.Invertible.tmul_comm`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory t-algebra label:t-algebra$	59/2	Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/PicardGroup.lean	3	5	['alreadydone', 'github-actions', 'themathqueen']	nobody	3-61595 3 days ago	8-30464 8 days ago	8-30499 8 days
31444	harahu author:harahu	doc(Probability/Martingale/BorelCantelli): polish docstrings	Fix some typos and inconsistencies in `BorelCantelli`. The issues were found and fixed using Codex. The most substantive change is going from $$f_n := \sum_{k < n} \mathbf{1}_{s_{n + 1}} - \mathbb{P}[s_{n + 1} \mid \mathcal{F}_n]$$ to $$f_n := \sum_{k < n} \big(\mathbf{1}_{s_{k + 1}} - \mathbb{P}[s_{k + 1} \mid \mathcal{F}_k]\big).$$ As far as I can tell, this is more faithful to the contents of the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability delegated	5/5	Mathlib/Probability/Martingale/BorelCantelli.lean	1	3	['github-actions', 'grunweg', 'mathlib-bors']	nobody	3-60452 3 days ago	3-60452 3 days ago	0-71658 19 hours
31463	harahu author:harahu	Tidy documentation code blocks	This PR will not be published in its current form. It is intended to be broken up into a collection of smaller PRs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		300/171	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Away.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Order/Nonneg/Module.lean,Mathlib/Algebra/QuadraticAlgebra/Basic.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/AlgebraicGeometry/Morphisms/Descent.lean,Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean,Mathlib/Analysis/Calculus/LocalExtr/Rolle.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Convex/StdSimplex.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSq.lean,Mathlib/Analysis/SpecialFunctions/Pow/Integral.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ColimCoyoneda.lean,Mathlib/CategoryTheory/Equivalence/Symmetry.lean,Mathlib/CategoryTheory/FiberedCategory/HasFibers.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Galois/IsFundamentalgroup.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Braided/Multifunctor.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Pretriangulated.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/PFunctor/Multivariate/W.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/FieldTheory/Minpoly/Basic.lean,Mathlib/FieldTheory/NormalizedTrace.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/GroupTheory/GroupAction/Iwasawa.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/NoncommCoprod.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Lean/Expr/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Matrix/Gershgorin.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/Logic/Function/CompTypeclasses.lean,Mathlib/MeasureTheory/Group/Measure.lean,Mathlib/MeasureTheory/Integral/CircleAverage.lean,Mathlib/MeasureTheory/Integral/IntervalAverage.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/LSeries/Nonvanishing.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleNumber.lean,Mathlib/Order/Booleanisation.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Trunc.lean,Mathlib/RingTheory/Polynomial/Wronskian.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Tactic/CategoryTheory/Elementwise.lean,Mathlib/Tactic/Choose.lean,Mathlib/Tactic/CongrExclamation.lean,Mathlib/Tactic/DeriveTraversable.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Linarith/Oracle/FourierMotzkin.lean,Mathlib/Tactic/Linter/DeprecatedModule.lean,Mathlib/Tactic/Linter/FlexibleLinter.lean,Mathlib/Tactic/Linter/PPRoundtrip.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/Relation/Rfl.lean,Mathlib/Tactic/Relation/Symm.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Tactic/Subsingleton.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/IsUniformGroup/Constructions.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/MetricSpace/DilationEquiv.lean,Mathlib/Topology/MetricSpace/PiNat.lean,Mathlib/Topology/Order/OrderClosed.lean,Mathlib/Topology/VectorBundle/Riemannian.lean,Mathlib/Util/SynthesizeUsing.lean,MathlibTest/DoubleUnderscore.lean,MathlibTest/FindSyntax.lean,MathlibTest/depRewrite.lean,MathlibTest/factorial.lean,MathlibTest/meta.lean	103	4	['github-actions', 'grunweg', 'harahu']	nobody	3-59247 3 days ago	3-59247 3 days ago	0-0 0 seconds
27244	xroblot author:xroblot	feat(RingTheory/DedekindDomain): lifting an ideal in an extension is injective	This PR develops some API for [FractionalIdeal.extendedHomₐ](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/FractionalIdeal/Extended.html#FractionalIdeal.extendedHom%E2%82%90) and in particular proves when it is an injective map. As a consequence, it deduces the fact that lifting an integral ideal in an extension of Dedekind domains is an injective map. Note: the import increase happens in a leaf file `Mathlib.RingTheory.FractionalIdeal.Extended` --- - [x] depends on: #28800	t-ring-theory large-import	55/9	Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean	2	14	['erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'xroblot']	kbuzzard assignee:kbuzzard	3-58351 3 days ago	3-58351 3 days ago	105-80262 105 days
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/)	t-analysis WIP	187/0	Mathlib.lean,Mathlib/Probability/MarcinkiewiczZygmund.lean	2	39	['Parcly-Taxel', 'YaelDillies', 'b-mehta', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	3-55707 3 days ago	292-83616 9 months ago	89-28229 89 days
31429	llllvvuu author:llllvvuu	feat(Topology): generalize `IsModuleTopology` lemmas to semilinear maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	116/52	Mathlib/Topology/Algebra/Module/Basic.lean,Mathlib/Topology/Algebra/Module/ModuleTopology.lean	2	3	['erdOne', 'github-actions', 'llllvvuu']	kbuzzard assignee:kbuzzard	3-55187 3 days ago	4-65841 4 days ago	4-65838 4 days
25799	dagurtomas author:dagurtomas	feat(CategoryTheory): the universal property of localized monoidal categories	This PR provides a monoidal structure on any functor out of a localized monoidal category whose precomposition with the localization functor is monoidal --- - [x] depends on: #29564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24727. Original PR: https://github.com/leanprover-community/mathlib4/pull/24727	t-category-theory	209/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/Bifunctor.lean,Mathlib/CategoryTheory/Localization/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Multifunctor.lean	5	28	['dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	TwoFX assignee:TwoFX	3-51499 3 days ago	3-51559 3 days ago	65-1448 65 days
31473	YaelDillies author:YaelDillies	feat(RingTheory): compute `counitAlgHom`/`comulAlgHom` on specific bialgebras	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	15/0	Mathlib/RingTheory/Bialgebra/Basic.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean	3	1	['github-actions']	nobody	3-51384 3 days ago	3-51449 3 days ago	3-51424 3 days
31366	FaffyWaffles author:FaffyWaffles	feat(Analysis/SpecialFunctions/StirlingRobbins): Robbins' sharp stepwise bound for stirlingSeq	Introduces `Mathlib.Analysis.SpecialFunctions.StirlingRobbins`, proving Robbins' sharp stepwise bound for the Stirling sequence. * Main theorem: `log_stirlingSeq_diff_le` * Improves the existing bound `1/(4k^2)` to the sharp `1/(12k(k+1))` * Adds helper lemmas on summability and geometric bounds * Complements `Stirling.lean` References: - https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/SpecialFunctions/Stirling.html - Robbins (1955), A Remark on Stirling’s Formula --- Note for Transparency: Assistance provided by AI tools (Claude and Aristotle) for drafting, text, and structure. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	154/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/StirlingRobbins.lean	2	2	['github-actions', 'tb65536']	nobody	3-50289 3 days ago	3-50289 3 days ago	2-82208 2 days
27053	tb65536 author:tb65536	(WIP) Galois group of `x^n - x - 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra WIP label:t-algebra$	423/12	Mathlib/GroupTheory/Perm/ClosureSwap.lean,Mathlib/RingTheory/Polynomial/Selmer.lean	2	5	['AntoineChambert-Loir', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	3-41277 3 days ago	13-3202 13 days ago	0-1 1 second
31362	BeibeiX0 author:BeibeiX0	feat(partitions): generalized pentagonal numbers.	feat(partitions): generalized pentagonal numbers and error term eₙ Introduce infrastructure around Euler’s pentagonal number theorem: * Define parity counters for strict partitions: - `p_even_distinct n` - `p_odd_distinct n` - `strict_partitions_parity_diff n := (p_even_distinct n : ℤ) - (p_odd_distinct n : ℤ)` * Generalized pentagonal numbers: - `generalizedPentagonalZ : ℤ → ℤ` with basic API (`gpn_nonneg`, `gpn_coe`) - `generalizedPentagonalNum : ℤ → ℕ` - parity lemma `even_neg_j_add_three_j_sq` and `even_neg_j_add_three_j_sq'` - search window equivalence `exists_j_iff_exists_j_in_range` - `Decidable (∃ j : ℤ, n = generalizedPentagonalZ j)` via a bounded range * Euler error term: - `error_term_e n : ℤ` (≔ `(-1)^{\|j\|}` if `n = generalizedPentagonalZ j` for some `j`, and `0` otherwise) * Finite product cut-off of the generating function: - `E n : PowerSeries ℤ := ∏_{k=1}^{n+1} (1 - X^k)` - lemma `coeff_E_eq_coeff_cutoff` Implementation notes: * Keep the integer-valued version `generalizedPentagonalZ` for arithmetic lemmas and signs; obtain the natural-number version via `Int.toNat`. * The bounded search lemma gives a small window `j ∈ [-(n+1), n+1]` for decidability. Motivation: * This is groundwork for proofs of Euler’s pentagonal number theorem and parity identities relating strict partitions to the error term. References: * https://en.wikipedia.org/wiki/Pentagonal_number_theorem	new-contributor t-combinatorics	256/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/PentagonalNumbers.lean	2	5	['BeibeiX0', 'github-actions', 'wwylele']	nobody	3-31514 3 days ago	6-56669 6 days ago	6-56703 6 days
31489	alreadydone author:alreadydone	feat(FieldTheory): fg extension over perfect field is separably generated	Co-authored-by: Christian Merten Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	446/22	Mathlib.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/Normal/Closure.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/FieldTheory/SeparableClosure.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SeparablyGenerated.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/RingTheory/AlgebraicIndependent/Defs.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean	11	1	['github-actions']	nobody	3-29620 3 days ago	3-29628 3 days ago	3-29660 3 days
30998	erdOne author:erdOne	feat(FieldTheory): fg extension over perfect field is separably generated	Co-authored-by: Christian Merten --- - [x] depends on: #24344 - [x] depends on: #24346 - [x] depends on: #24347 - [x] depends on: #24348 - [x] depends on: #24349 - [x] depends on: #25062 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24350. Original PR: https://github.com/leanprover-community/mathlib4/pull/24350	t-algebra awaiting-author label:t-algebra$	416/0	Mathlib.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/SeparablyGenerated.lean	3	6	['alreadydone', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	joelriou assignee:joelriou	3-29290 3 days ago	4-66742 4 days ago	12-7357 12 days
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/)	t-differential-geometry WIP	591/0	Mathlib.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-27654 3 days ago	3-27656 3 days ago	0-13 13 seconds
26831	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/SpecificGroups/Alternating/MaximalSubgroups): maximal subgroups of the alternating group	This proves the first case (intransitive) of the O'Nan-Scott classification of maximal subgroups of the alternating group. --- - [x] depends on: #26457 - [x] depends on: #26282 - [x] depends on: #26281 - [x] depends on: #26280 - [x] depends on: #26279 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	569/20	Mathlib.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/Perm/MaximalSubgroups.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/MaximalSubgroups.lean	6	n/a	['AntoineChambert-Loir', 'adomani', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-25421 3 days ago	unknown	unknown
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 label:t-algebra$	16/7	Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean	5	7	['alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	mattrobball assignee:mattrobball	3-21700 3 days ago	10-55934 10 days ago	20-81916 20 days
30133	smmercuri author:smmercuri	feat: `WithVal v` and `WithVal w` are isomorphic as uniform spaces when `v` and `w` are equivalent valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		97/0	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	2	2	['github-actions', 'kbuzzard']	robin-carlier assignee:robin-carlier	3-21699 3 days ago	10-75570 10 days ago	14-49095 14 days
31145	FernandoChu author:FernandoChu	chore(CategoryTheory): `IsRegularEpi` and its `MorphismProperty`	This PR proves that isos are regular epis, and that epis are closed under postcomposition of isos. It also adds `IsRegularEpi` and the `MorphismProperty` it induces. This is so we can define regular categories, which require the regular epis to be stable under base change. This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	large-import t-category-theory	106/10	Mathlib/CategoryTheory/Limits/Shapes/RegularMono.lean,Mathlib/CategoryTheory/Limits/Shapes/StrongEpi.lean	2	12	['FernandoChu', 'github-actions', 'joelriou']	robin-carlier assignee:robin-carlier	3-21696 3 days ago	10-38515 10 days ago	12-42258 12 days
31210	jsm28 author:jsm28	feat(Geometry/Euclidean/MongePoint): `reindex` lemmas	Add lemmas about `mongePoint`, `mongePlane` and `orthocenter` applied to `Simplex.reindex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	28/0	Mathlib/Geometry/Euclidean/MongePoint.lean	1	1	['github-actions']	JovanGerb assignee:JovanGerb	3-21695 3 days ago	11-17579 11 days ago	11-17555 11 days
31215	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries): introduce binomialFamily and generalized powers.	We introduce a way to take generalized powers of Hahn series whose leading term is 1. The powers take values in a binomial ring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	286/14	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Basic.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	6	1	['github-actions']	erdOne assignee:erdOne	3-21694 3 days ago	10-73201 10 days ago	10-73237 10 days
31224	YaelDillies author:YaelDillies	feat(Algebra/Homology): pushforward of connected complexes	This is useful for proving functoriality of Tate cohomology, whose complex is defined as the connection of the homology and cohomology complexes. From ClassFieldTheory Co-authored-by: Edison Xie Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT t-algebra label:t-algebra$	75/25	Mathlib/Algebra/Homology/Embedding/Connect.lean	1	4	['YaelDillies', 'erdOne', 'github-actions']	dagurtomas assignee:dagurtomas	3-21693 3 days ago	10-59315 10 days ago	10-61026 10 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 awaiting-author	44/0	Mathlib/Topology/Defs/Basic.lean	1	14	['eric-wieser', 'github-actions', 'kckennylau', 'robertmaxton42']	nobody	3-21217 3 days ago	4-70226 4 days ago	0-243 4 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	t-ring-theory	179/0	Mathlib.lean,Mathlib/NumberTheory/Padics/Torsion.lean,Mathlib/RingTheory/ZMod/Torsion.lean	3	4	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	erdOne assignee:erdOne	3-18107 3 days ago	3-18107 3 days ago	43-2027 43 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	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	49	['ADedecker', 'erdOne', 'faenuccio', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant', 'loefflerd', 'mathlib4-dependent-issues-bot', 'pechersky']	jcommelin assignee:jcommelin	3-18050 3 days ago	3-18050 3 days ago	31-10520 31 days
31494	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/SecondInter): `eq_or_eq_secondInter_of_mem_affineSpan_pair_iff_mem`	Add a variant of `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` in a form that's more convenient when the line is given in terms of two points, rather than a point and a vector. ```lean /-- A point on a line through a point on a sphere and a second point equals that point or `secondInter`. -/ lemma Sphere.eq_or_eq_secondInter_of_mem_affineSpan_pair_iff_mem {s : Sphere P} {p q : P} (hp : p ∈ s) {p' : P} (hp' : p' ∈ line[ℝ, p, q]) : p' = p ∨ p' = s.secondInter p (q -ᵥ p) ↔ p' ∈ s := by ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	11/0	Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean	1	1	['github-actions']	nobody	3-17207 3 days ago	3-17273 3 days ago	3-17248 3 days
31240	AntoineChambert-Loir author:AntoineChambert-Loir	feat: base change properties, direct sums, bases, modules of linear maps	Establish various `IsBaseChange` properties: * direct sums commute with base change * when the source module is finite free, modules of linear maps commute with base change (on the right, on both sides, and for endomorphisms). * a base change of a free module is free, with compatible bases. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	399/6	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	6	3	['AntoineChambert-Loir', 'github-actions']	nobody	3-16268 3 days ago	3-16268 3 days ago	10-26996 10 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	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	31	['chrisflav', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	chrisflav assignee:chrisflav	3-14652 3 days ago	3-14652 3 days ago	43-65235 43 days
31133	thorimur author:thorimur	feat(Linter): combinators for linter option boilerplate	Provides simple combinators `whenLinterOption` and `whenNotLinterOption` to parallel `whenPPOption` and `whenNotPPOption`, and bundles `withSetOptionIn` and `whenLinterOption` into `whenLinterActivated`. Currently, a typical linter action uses ```lean run := withSetOptionIn fun stx => do unless getLinterValue linter.foo (← getLinterOptions) do return ... ``` This allows us to simply write ```lean run := whenLinterActivated linter.foo fun stx => do ... ``` Using these combinators in Mathlib's linters is left to a subsequent PR (#31134). Since this is a utility used in basic linters, including the header linter, we exclude it from `lint-style`. --- I'm not sure I'm doing the right thing here re: Mathlib.Init. What exactly should happen? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter t-meta	50/0	Mathlib.lean,Mathlib/Lean/Linter.lean,scripts/lint-style.lean	3	3	['adomani', 'github-actions', 'thorimur']	adomani assignee:adomani	3-7213 3 days ago	13-25996 13 days ago	13-32358 13 days
31498	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/Independent): add affine independence permutation lemmas for three points	--- Add three helper theorems for convenient reasoning with affine independence: - `AffineIndependent.comm_left` - `AffineIndependent.comm_right` - `AffineIndependent.reverse_of_three`	t-algebra label:t-algebra$	25/0	Mathlib/LinearAlgebra/AffineSpace/Independent.lean	1	1	['github-actions']	nobody	3-6025 3 days ago	3-6046 3 days ago	3-6081 3 days
31499	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/FiniteDimensional): add lemma preserving affine independence under collinear point replacement	--- Add `affineIndependent_of_affineIndependent_collinear_ne`	t-algebra label:t-algebra$	15/0	Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean	1	1	['github-actions']	nobody	3-5685 3 days ago	3-5692 3 days ago	3-5733 3 days
25779	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/NaturalTransformations): strong and lax natural transformations of lax functors	Given two lax functors `F G` between bicategories, we define lax natural transformations as families of 1-morphisms `∀ a : B, F.obj a ⟶ G.obj a` equipped with a naturality 2-cell `∀ {a b : B} (f : a ⟶ b), app a ≫ G.map f ⟶ F.map f ≫ app b` that are required to satisfy conditions such as naturality, and compatibility with the `mapId` and `mapComp` fields of the source and target functors. This notion dualizes the existing notion of oplax natural transformations between, and tries to narrow the current gap between lax and oplax functors in the library, where the latter has much more formalized API. For maintainability, The code tries to stay as aligned as possible with the code in `CategoryTheory.Bicategory.Naturaltransformations.Oplax`. --- I followed the book by Johnson and Yau for the definition. I made @yuma-mizuno and @callesonne authors of the files, as they are the authors of the original code for Oplax functors, which I basically copy-pasted and modified to make it work with lax functors. They should feel free to modify this if they want. Next thing on the list is to tackle modifications between lax/strong natural transforms of lax transforms, as well as the category instance on lax functors. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25565. Original PR: https://github.com/leanprover-community/mathlib4/pull/25565	t-category-theory	286/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,scripts/noshake.json	3	8	['github-actions', 'joelriou', 'robin-carlier', 'yuma-mizuno']	joelriou assignee:joelriou	2-75386 2 days ago	2-75386 2 days ago	119-59290 119 days
29145	JovanGerb author:JovanGerb	chore: use `to_additive` in more places	This PR addresses some comments about `to_additive` not working, by making it work more. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta	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	3	['JovanGerb', 'github-actions']	nobody	2-74072 2 days ago	2-74073 2 days ago	72-68717 72 days
31395	peakpoint author:peakpoint	feat(Analysis/Normed/Affine/Isometry): interpret `AffineIsometry{Map,Equiv}` as `ContinuousAffine{Map,Equiv}`	Extracted from #27378 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	52/3	Mathlib/Analysis/Normed/Affine/Isometry.lean	1	6	['github-actions', 'jsm28', 'ocfnash', 'peakpoint']	nobody	2-73531 2 days ago	2-73531 2 days ago	2-49012 2 days
31298	jjdishere author:jjdishere	feat(RingTheory/AdicCompletion): `IsAdicComplete.lift` APIs for `RingHoms`	In this PR, we build every API of the module version `IsAdicComplete.lift` for the ring version `IsAdicComplete.liftRingHom`. Mainly copying APIs in #25837, #31295, #31296. This would be used in #26388. --- - [x] depends on: #31296 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	308/0	Mathlib.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/RingHom.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-68371 2 days ago	unknown	unknown
31503	Scarlett-le author:Scarlett-le	feat(Geometry/Euclidean/PerpBisector): add distance inequalities for Sbtw with perpendicularity	This PR adds two theorems about distance relationships when points satisfy strict betweenness (`Sbtw`) and perpendicularity conditions: ### New theorems - `dist_lt_of_sbtw_of_inner_eq_zero`: If `b` is strictly between `a` and `c`, and `p - a` is perpendicular to `b - a`, then `dist p b < dist p c`. - `dist_lt_of_sbtw_of_mem_perpBisector`: If `p` lies on the perpendicular bisector of `ab` and `b` is strictly between `a` and `c`, then `dist p b < dist p c`.	new-contributor t-euclidean-geometry	47/0	Mathlib/Geometry/Euclidean/PerpBisector.lean	1	1	['github-actions']	nobody	2-65489 2 days ago	2-76680 2 days ago	2-76719 2 days
31496	Scarlett-le author:Scarlett-le	feat(Geometry/Euclidean/Sphere/Power): power equals squared tangent length and characterization of tangency	Adds two lemmas in `Geometry.Euclidean.Sphere.Power`: * `power_eq_dist_sq_of_IsTangentAt` — the power of a point equals the square of its tangent length. * `IsTangentAt_of_dist_sq_eq_power` — characterization of tangency via the power of a point.	large-import new-contributor t-euclidean-geometry	18/0	Mathlib/Geometry/Euclidean/Sphere/Power.lean	1	2	['github-actions', 'jsm28']	nobody	2-65463 2 days ago	3-11877 3 days ago	3-11919 3 days
30349	loefflerd author:loefflerd	feat(Topology/Constructions): `IsDiscrete` predicate on sets	Define an `IsDiscrete` predicate on sets in a topological space (which is equivalent to `DiscreteTopology` for the corresponding subtype). --- See issue #30368. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	127/59	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/MeasureTheory/Group/GeometryOfNumbers.lean,Mathlib/MeasureTheory/Topology.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/NumberTheory/Transcendental/Liouville/Basic.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/DiscreteSubset.lean,Mathlib/Topology/Instances/ZMultiples.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean,Mathlib/Topology/Separation/Basic.lean	17	4	['github-actions', 'j-loreaux']	j-loreaux assignee:j-loreaux	2-57236 2 days ago	2-57236 2 days ago	8-85424 8 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/)	t-linter awaiting-CI	93/1	Mathlib.lean,Mathlib/Lean/Meta/WarningAsError.lean,Mathlib/Tactic/Field.lean	3	4	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-56951 2 days ago	2-56959 2 days ago	0-0 0 seconds
31414	SnirBroshi author:SnirBroshi	feat(Data/Nat/Bitwise): formula for the xor of {0,...,n}	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	40/2	Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bitwise.lean	2	3	['SnirBroshi', 'github-actions', 'plp127']	nobody	2-56296 2 days ago	4-45676 4 days ago	4-83537 4 days
31506	FLDutchmann author:FLDutchmann	feat: Qq version of getLevel	These were helpful for writing the `algebra` tactic for adding Qq annotations in cases where I know that an expression is a type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	11/2	Mathlib/Util/Qq.lean	1	6	['FLDutchmann', 'github-actions', 'grunweg']	nobody	2-53757 2 days ago	2-53757 2 days ago	2-61095 2 days
31353	EtienneC30 author:EtienneC30	feat: ofLp and toLp of a sum	Introduce an `AddEquiv` version of `WithLp.equiv` and use it to prove that `(∑ i ∈ s, f i).ofLp = ∑ i ∈ s, (f i).ofLp` and `toLp p (∑ i ∈ s, f i) = ∑ i ∈ s, toLp p (f i)`. --- [![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$	79/16	Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/MeasureTheory/Measure/Haar/InnerProductSpace.lean	6	19	['EtienneC30', 'eric-wieser', 'github-actions', 'j-loreaux', 'themathqueen']	nobody	2-53013 2 days ago	2-53013 2 days ago	4-16349 4 days
31173	jsm28 author:jsm28	feat(Mathlib/Geometry/Euclidean/Incenter): excenters do not lie in faces	Add lemmas with various versions of the statement that an excenter of a simplex does not lie in the affine span of a face. `excenter_ne_point` becomes a special case of this with a two-line proof. --- - [ ] depends on: #31172 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	53/10	Mathlib/Geometry/Euclidean/Incenter.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-50466 2 days ago	2-51099 2 days ago	2-54176 2 days
26390	jjdishere author:jjdishere	feat(Topology/Algebra): Krasner's lemma	This PR continues the work from #18444. Original PR: https://github.com/leanprover-community/mathlib4/pull/18444	t-algebra t-topology t-number-theory WIP label:t-algebra$	440/0	Mathlib.lean,Mathlib/Topology/Algebra/Krasner.lean	2	n/a	['github-actions', 'jjdishere']	nobody	2-49501 2 days ago	unknown	unknown
26277	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Congruence/Hom): prove basic isomorphisms theorems for ring congruences	This file contains elementary definitions involving congruence relations and morphisms for semirings, rings, and algebras. * `RingCon.ker`: the kernel of a monoid homomorphism as a congruence relation * `RingCon.lift`, `RingCon.liftₐ`: the homomorphism / the algebra morphism on the quotient given that the congruence is in the kernel * `RingCon.map`, `RingCon.mapₐ`: homomorphism / algebra morphism from a smaller to a larger quotient * `RingCon.quotientKerEquivRangeS`, `RingCon.quotientKerEquivRange`, `RingCon.quotientKerEquivRangeₐ` : the first isomorphism theorem for semirings (using `RingHom.rangeS`), rings (using `RingHom.range`) and algebras (using `AlgHom.range`). * `RingCon.comapQuotientEquivRangeS`, `RingCon.comapQuotientEquivRange`, `RingCon.comapQuotientEquivRangeₐ` : the second isomorphism theorem for semirings (using `RingHom.rangeS`), rings (using `RingHom.range`) and algebras (using `AlgHom.range`). * `RingCon.quotientQuotientEquivQuotient`, `RingCon.quotientQuotientEquivQuotientₐ` : the third isomorphism theorem for semirings (or rings) and algebras It is an adaptation of what existed for multiplicative congruences (docs#Con) and is only useful for semirings which are not rings. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	531/3	Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Data/Set/Restrict.lean,Mathlib/LinearAlgebra/Dimension/DivisionRing.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean	7	52	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'kckennylau']	joneugster assignee:joneugster	2-49293 2 days ago	2-49293 2 days ago	140-51469 140 days
31227	YaelDillies author:YaelDillies	feat(Algebra/Homology): sandwich a comm group between two finite comm groups	From ClassFieldTheory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT maintainer-merge t-algebra label:t-algebra$	64/39	Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Data/Finite/Prod.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Finite.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean	6	10	['YaelDillies', 'erdOne', 'github-actions', 'jcommelin']	erdOne assignee:erdOne	2-49270 2 days ago	2-68471 2 days ago	10-44949 10 days
31464	Ljon4ik4 author:Ljon4ik4	improved R-linearity to A-linearity in the PushForward of Derivations	Let $A$ be an $R$-algebra for a commutative ring $R$ and $f:M\to N$ an $A$-module homomorphism. Given a derivation $D\in Der_R(A,M)$, we have a derivation $f \circ D$ of $Der_R(A,N)$. The induced map $Der_R(A,M)\to Der_R(A,N)$ is $A$-linear but was only reported to be $R$-linear in the previous implementation. All changes are in the PushForward section of the RingTheory/Derivation/Basic.lean file. The statements of definitions * `_root_.LinearMap.compDer` * `llcomp` * `_root_.LinearEquiv.compDer` are changed from $R$-linear to $A$-linear. For the stronger linearity the proof of `map_smul'` in `_root_.LinearMap.compDer` had to be changed. The rest remains as is. Edit: Some files explicitly used the weaker version, these have now been changed, by applying `.restrictScalars (R:=...)`, whereever the weaker linearity version of `compDer` was needed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	9/8	Mathlib/Geometry/Manifold/Algebra/LeftInvariantDerivation.lean,Mathlib/Geometry/Manifold/DerivationBundle.lean,Mathlib/RingTheory/Derivation/Basic.lean,Mathlib/RingTheory/Kaehler/Basic.lean	4	13	['Ljon4ik4', 'erdOne', 'github-actions', 'kckennylau']	nobody	2-49211 2 days ago	2-50196 2 days ago	3-66340 3 days
31231	Jlh18 author:Jlh18	refactor: MorphismProperty.HasPullbacksAlong	Fix a morphism `f : X -> Y` in a category `C` with two morphism properties `P` and `Q`. To define a pullback functor between the subcategories of the slice categories `P.Over Q Y ⥤ P.Over Q X` one does not need the existence of all pullbacks along `f`. This refactor requires only that `f` has pullbacks of `P`-morphisms. This property of "`f` has pullbacks of `P`-morphisms is defined as a typeclass. Note that it cannot simply be an `abbrev` like `Limits.HasPullbacksAlong` because the typeclass inference system will not be able to infer `P` that way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	72/34	Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/MorphismProperty/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean	3	11	['Jlh18', 'chrisflav', 'github-actions', 'joelriou']	joelriou assignee:joelriou	2-48663 2 days ago	2-48681 2 days ago	10-39690 10 days
30895	callesonne author:callesonne	feat(Bicategory/Modification/Pseudo): define modifications between strong natural transformations of pseudofunctors	This PR adds modifications between strong natural transformations of pseudofunctors. At the same time, it improves the existing code on modifications between oplax natural tranformations of oplax functors (by removing some simp lemmas). This is a migration of #18254 to a fork. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	334/46	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	6	12	['callesonne', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	2-48560 2 days ago	2-68646 2 days ago	12-60742 12 days
30132	callesonne author:callesonne	feat(Bicategory/Functor/Strict): add `StrictPseudofunctor`	This PR adds the notion of a strict pseudofunctor, where the coherence isomorphisms are equalities. This will be useful for #25561 where I define the bicategory of groupoids. --- - [x] depends on: #30134 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	181/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/StrictPseudofunctor.lean	2	17	['callesonne', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	2-48384 2 days ago	2-68299 2 days ago	13-70469 13 days
31388	b-mehta author:b-mehta	feat(Topology/Order): add unordered versions of topological Rolle's theorem	To support this, we also add lemmas about extending functions from unordered intervals, and take the liberty of using `variable` more in that file, and removing an `erw`. The motivation here is that this is useful infrastructure for an unordered/central version of Taylor's theorem, as discussed here: [#maths > Taylor's theorem @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Taylor's.20theorem/near/402571017). As such, this PR also originates from the Exponential Ramsey project. The PR currently makes a couple of different changes, but the overall diff is relatively small, and helps to motivate some of the changes, so I elected to keep it one PR for now, unless other maintainers would prefer it to be split up or further explained.	tech debt t-analysis awaiting-author	107/24	Mathlib/Order/Interval/Set/UnorderedInterval.lean,Mathlib/Topology/Order/DenselyOrdered.lean,Mathlib/Topology/Order/ExtendFrom.lean,Mathlib/Topology/Order/LeftRight.lean,Mathlib/Topology/Order/Rolle.lean	5	n/a	['ADedecker', 'b-mehta', 'github-actions', 'j-loreaux', 'mcdoll', 'plp127']	nobody	2-46134 2 days ago	unknown	unknown
31512	gasparattila author:gasparattila	feat(MeasureTheory): typeclass for measurability of equality	Currently, there are multiple lemmas of the form `MeasurableSet {x \| f x = g x}` with different typeclass assumptions. This PR unifies them using a new `MeasurableEq` typeclass. A new instance for second-countable Hausdorff spaces is also added. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	75/50	Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Group/Arithmetic.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/MeasurableSpace/Defs.lean,Mathlib/MeasureTheory/Measure/AEMeasurable.lean,Mathlib/MeasureTheory/Measure/Trim.lean,Mathlib/Probability/Kernel/CondDistrib.lean,Mathlib/Probability/Kernel/Posterior.lean	8	1	['github-actions']	nobody	2-45011 2 days ago	2-53753 2 days ago	2-53796 2 days
31504	joelriou author:joelriou	refactor(CategoryTheory/Shift): export Functor.CommShift.commShiftIso	The isomorphism of commutation with shifts `Functor.CommShift.iso` is renamed `Functor.CommShift.commShiftIso` and exported as `Functor.commShiftIso` (which was a definition previously). This allows to generate a few equational lemmas automatically. A few `erw` are also removed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	79/112	Mathlib/Algebra/Homology/HomotopyCategory/Shift.lean,Mathlib/CategoryTheory/Shift/Adjunction.lean,Mathlib/CategoryTheory/Shift/CommShift.lean,Mathlib/CategoryTheory/Shift/Induced.lean,Mathlib/CategoryTheory/Shift/Localization.lean,Mathlib/CategoryTheory/Shift/Opposite.lean,Mathlib/CategoryTheory/Shift/Pullback.lean,Mathlib/CategoryTheory/Shift/Quotient.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Functor.lean	11	7	['github-actions', 'joelriou', 'leanprover-bot']	nobody	2-39604 2 days ago	2-39604 2 days ago	2-39579 2 days
31407	SnirBroshi author:SnirBroshi	feat(Analysis/SpecialFunctions/Gamma/BohrMollerup): Gamma is strictly decreasing on (0, 1]	--- - [x] depends on: #31405 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	30/0	Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-36678 2 days ago	2-37673 2 days ago	2-38487 2 days
31180	CoolRmal author:CoolRmal	feat(Analysis): a closed convex set is the intersection of countably many half-spaces in a separable Banach space	This lemma is needed in the proof of conditional Jensen's inequality: #27953 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	91/11	Mathlib/Analysis/LocallyConvex/Separation.lean	1	31	['CoolRmal', 'EtienneC30', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	nobody	2-35579 2 days ago	2-41743 2 days ago	2-52764 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/)	awaiting-bench t-analysis	110/11	Mathlib/Analysis/Normed/Ring/Basic.lean,MathlibTest/TCSynth.lean	2	4	['github-actions', 'j-loreaux', 'leanprover-bot']	ADedecker assignee:ADedecker	2-35312 2 days ago	2-38816 2 days ago	53-61680 53 days
29512	grunweg author:grunweg	feat: check for PR titles which do not start with "feat" etc.	We ignore draft PRs and PRs with the WIP label. The set of checks is intentionally kept small, and could be expanded in the future. --- More basic version of #16303: given that mathlib's statistics will use the PR kind, let's make sure PR kinds are somewhat appropriate. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	506/0	.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	23	['bryangingechen', 'eric-wieser', 'github-actions', 'grunweg']	bryangingechen assignee:bryangingechen	2-32771 2 days ago	2-43970 2 days ago	63-62050 63 days
31520	harahu author:harahu	doc(Geometry): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `Geometry` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually is. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	5/5	Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean	4	1	['github-actions']	nobody	2-32636 2 days ago	2-32641 2 days ago	2-32682 2 days
31519	harahu author:harahu	doc(FieldTheory): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `FieldTheory` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually is. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	3/3	Mathlib/FieldTheory/Galois/GaloisClosure.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean	3	1	['github-actions']	nobody	2-32630 2 days ago	2-33312 2 days ago	2-33349 2 days
31521	harahu author:harahu	doc(GroupTheory): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `GroupTheory` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually is. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	3/3	Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean	3	1	['github-actions']	nobody	2-32103 2 days ago	2-32108 2 days ago	2-32147 2 days
31522	harahu author:harahu	doc(LinearAlgebra): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the `LinearAlgebra` subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting documentation webpage actually is. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	3/3	Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/Projectivization/Independence.lean,Mathlib/LinearAlgebra/Quotient/Pi.lean	3	1	['github-actions']	nobody	2-30833 2 days ago	2-30839 2 days ago	2-30876 2 days
31179	SnirBroshi author:SnirBroshi	feat(Algebra/QuadraticAlgebra/NormDeterminant): norm = det of left-mul endomorphism	The norm of an element in a quadratic algebra is the determinant of the endomorphism defined by left multiplication by that element. --- I believe this is the reasoning behind the definition of the norm, though there might be an easier way to motivate the definition that I'm not aware of. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	45/1	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Basic.lean,Mathlib/Algebra/QuadraticAlgebra/NormDeterminant.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean	4	5	['SnirBroshi', 'github-actions', 'kckennylau', 'themathqueen']	jcommelin assignee:jcommelin	2-30167 2 days ago	2-30175 2 days ago	12-5122 12 days
29257	harahu author:harahu	doc: attach "pre", "pseudo", "semi" and "sub" as a prefixes where they are now free-standing	These are all examples of [bound morphemes](https://en.wikipedia.org/wiki/Bound_and_free_morphemes) and should be attached, either in closed form or by hyphen, to some other construct. Whether to write the resulting words in closed form or with a hyphen is a stylistic choice and I am open to discussing the specifics, should that be of interest. I've made choices based on existing literature and what I personally found natural, but other opinions are welcome. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	42/42	Mathlib/Algebra/Star/NonUnitalSubsemiring.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Probability/Martingale/BorelCantelli.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/MetricSpace/Bounded.lean,Mathlib/Topology/MetricSpace/Gluing.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/MetricSpace/ThickenedIndicator.lean,Mathlib/Topology/MetricSpace/Thickening.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/Uniformity.lean,scripts/autolabel.lean	15	6	['euprunin', 'github-actions', 'harahu', 'mathlib4-merge-conflict-bot']	JovanGerb assignee:JovanGerb	2-29653 2 days ago	4-46460 4 days ago	0-0 0 seconds
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.	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	19	['artie2000', 'eric-wieser', 'github-actions', 'j-loreaux', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'pechersky']	joelriou assignee:joelriou	2-29587 2 days ago	2-35529 2 days ago	54-23157 54 days
31524	harahu author:harahu	doc(Logic/Equiv/Fintype): fix typos	Found and fixed with help from Claude. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	4/4	Mathlib/Logic/Equiv/Fintype.lean	1	1	['github-actions']	nobody	2-29487 2 days ago	2-29496 2 days ago	2-29532 2 days
28766	yury-harmonic author:yury-harmonic	feat(Nat/Factorial): use binary splitting for `ascFactorial`/`descFactorial`	Mathlib has a `@[csimp]` lemma for `Nat.factorial`. This PR adds similar lemmas for `Nat.ascFactorial` and `Nat.descFactorial`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor awaiting-author	49/25	Mathlib/Data/Nat/Factorial/Basic.lean	1	8	['github-actions', 'pechersky', 'plp127', 'yury-harmonic']	pechersky assignee:pechersky	2-28199 2 days ago	2-28199 2 days ago	65-53382 65 days
30879	grunweg author:grunweg	feat: beta reduce in the `T%` elaborator	Whenever the `T%` elaborator succeeds, head beta reduce the resulting application. This enables applying it with anonymous functions or inside big operators without issue. (For instance, all changes to `SmoothSection` in #30357 are now possible without addition `dsimp` steps.) In the process, also extract the workhorse component of the elaborator into an independent function and improve its doc-string to mention the corresponding tracing option. --- - [x] depends on: #30413 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta	62/20	Mathlib/Geometry/Manifold/Notation.lean,MathlibTest/DifferentialGeometry/Notation.lean	2	12	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'thorimur']	thorimur assignee:thorimur	2-21805 2 days ago	2-45399 2 days ago	13-640 13 days
28793	grunweg author:grunweg	feat: smooth immersions	Define smooth immersions between manifolds. We use a definition which allows for corners, infinite dimension and arbitrary fields. Future PRs will - prove that immersions are C^n (#28796), - prove another characterisation of immersions: f is immersed at x iff the differential df_x splits, i.e. is injective, has closed range and its image has a closed complement, and in particular that a map between finite-dimensional manifolds over a complete field is an immersion iff its differential is injective, - use this to prove that the product (#28853) and composition of immersions is an immersion, - use this theory to give more conceptual proofs of half of `Manifold/Instances/Icc.lean` (#29077) - define smooth embeddings and immersed and embedded smooth submanifolds --- - [x] depends on: #28701 - [x] depends on: #31123 Most of the above has been done at https://github.com/grunweg/mathlib4/tree/MR-define-immersions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	658/2	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Topology/Closure.lean,Mathlib/Topology/OpenPartialHomeomorph.lean,docs/references.bib	6	118	['chrisflav', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	sgouezel assignee:sgouezel	2-21749 2 days ago	2-21749 2 days ago	35-46446 35 days
26149	vasnesterov author:vasnesterov	feat(Topology): continuous surjection from Cantor set to Hilbert cube	1. Add `cantorToHilbert`: a continuous surjection from the Cantor space (`ℕ → Bool`) to the Hilbert Cube (`ℕ → unitInterval`). 2. Add auxiliary constructions for homeomorphisms: * `Equiv.toHomeomorphOfDiscrete`: any bijection between discrete spaces is a homeomorphism * `Homeomorph.piCurry`: `(X × Y → Z) ≃ₜ (X → Y → Z)` This is the first part of the Hausdorff–Alexandroff theorem's proof, the second is #26184. --- - [x] depends on: #26136 - [x] depends on: #31349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	100/0	Mathlib.lean,Mathlib/Analysis/Real/OfDigits.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean	6	5	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'vasnesterov']	dagurtomas assignee:dagurtomas	2-21702 2 days ago	6-23023 6 days ago	7-9053 7 days
30168	joelriou author:joelriou	feat(CategoryTheory): closure under bounded colimits	In this PR, given `P : ObjectProperty C` and `κ : Cardinal.{w}`, we introduce the closure `P.colimitsCardinalClosure κ` of `P` under colimits of shapes given by categories `J` such that `HasCardinalLT (Arrow J) κ` holds. If `C` is locally `w`-small and `P` is essentially `w`-small, we show that this closure `P.colimitsCardinalClosure κ` is also essentially `w`-small. (In particular, if `κ = ℵ₀`, this is the closure of `P` under finite colimits.) --- - [x] depends on: #29851 - [x] depends on: #29881 - [x] depends on: #29903 - [x] depends on: #29854 - [x] depends on: #30160 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	125/2	Mathlib.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsCardinalClosure.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean	3	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	2-21700 2 days ago	5-34553 5 days ago	5-34527 5 days
30570	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Connected): `reachabilitySet`	feat(Combinatorics/SimpleGraph/Connectivity/Connected): define `reachabilitySet` as the set of all pairs that have a walk between them --- The main motivation is making it easier to work with the bridge definition (see `isBridge_iff_mem_edgeSet_and_notMem_reachabilitySet_deleteEdges` and `mem_edgeSet_and_mem_reachabilitySet_deleteEdges_iff_exists_isCycle_and_mem_edges` at the bottom), although I think this set is worth defining regardless. - [x] depends on: #30542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		57/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kex-y assignee:kex-y	2-21699 2 days ago	6-47688 6 days ago	6-50198 6 days
30798	joelriou author:joelriou	feat(Algebra/Category/ModuleCat): a functorial projective resolution	Any `R`-module can be written functorialy as a quotient of a projective `R`-module. --- - [x] depends on: #30796 This PR continues the work from #22556. Original PR: https://github.com/leanprover-community/mathlib4/pull/22556	t-category-theory	52/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolution.lean,Mathlib/CategoryTheory/Preadditive/Injective/Basic.lean,Mathlib/CategoryTheory/Preadditive/Projective/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	2-21698 2 days ago	5-32584 5 days ago	5-32596 5 days
30812	joelriou author:joelriou	feat(CategoryTheory/Abelian): construction of reduced left resolutions	The standard functorial free resolution of a `R`-module `M` (#30798) does not directly extend to free resolutions of (bounded above) complexes because the free `R`-module functor does preserve zero morphisms. In this PR, we provide a general construction which takes functorial left resolutions and modify them by considering a suitable direct factor so that it preserves zero morphisms. --- - [x] depends on: #30796 This PR continues the work from #22547. Original PR: https://github.com/leanprover-community/mathlib4/pull/22547	t-category-theory	233/0	Mathlib.lean,Mathlib/Algebra/Homology/LeftResolution/Reduced.lean,Mathlib/Algebra/Homology/LeftResolution/Transport.lean,Mathlib/CategoryTheory/Idempotents/FunctorExtension.lean,Mathlib/CategoryTheory/Idempotents/Karoubi.lean,Mathlib/CategoryTheory/Retract.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	2-21697 2 days ago	5-30588 5 days ago	5-30641 5 days
30897	euprunin author:euprunin	chore(Order/Defs): golf multiple lemmas in `LinearOrder` using `grind`	--- Show trace profiling of `lt_trichotomy`: <10 ms before, <10 ms after 🎉 ### Trace profiling of `lt_trichotomy` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..12b8e67c46 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -87,6 +87,7 @@ lemma lt_of_not_ge (h : ¬b ≤ a) : a < b := lt_of_le_not_ge (le_of_not_ge h) h @[deprecated (since := "2025-05-11")] alias le_of_not_le := le_of_not_ge +set_option trace.profiler true in lemma lt_trichotomy (a b : α) : a < b ∨ a = b ∨ b < a := by grind [le_total, Decidable.lt_or_eq_of_le] ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (524ms) Build completed successfully (61 jobs). ``` ### Trace profiling of `lt_trichotomy` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..ea19594593 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -87,8 +87,9 @@ lemma lt_of_not_ge (h : ¬b ≤ a) : a < b := lt_of_le_not_ge (le_of_not_ge h) h @[deprecated (since := "2025-05-11")] alias le_of_not_le := le_of_not_ge +set_option trace.profiler true in lemma lt_trichotomy (a b : α) : a < b ∨ a = b ∨ b < a := by - grind [le_total, Decidable.lt_or_eq_of_le] + grind lemma le_of_not_gt (h : ¬b < a) : a ≤ b := match lt_trichotomy a b with ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (522ms) Build completed successfully (61 jobs). ``` --- Show trace profiling of `lt_or_gt_of_ne`: <10 ms before, <10 ms after 🎉 ### Trace profiling of `lt_or_gt_of_ne` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..f6b239762a 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -107,6 +107,7 @@ lemma le_or_gt (a b : α) : a ≤ b ∨ b < a := (lt_or_ge b a).symm @[deprecated (since := "2025-05-11")] alias le_or_lt := le_or_gt +set_option trace.profiler true in lemma lt_or_gt_of_ne (h : a ≠ b) : a < b ∨ b < a := by simpa [h] using lt_trichotomy a b lemma ne_iff_lt_or_gt : a ≠ b ↔ a < b ∨ b < a := ⟨lt_or_gt_of_ne, (Or.elim · ne_of_lt ne_of_gt)⟩ ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (526ms) Build completed successfully (61 jobs). ``` ### Trace profiling of `lt_or_gt_of_ne` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..32b1b7866a 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -107,7 +107,9 @@ lemma le_or_gt (a b : α) : a ≤ b ∨ b < a := (lt_or_ge b a).symm @[deprecated (since := "2025-05-11")] alias le_or_lt := le_or_gt -lemma lt_or_gt_of_ne (h : a ≠ b) : a < b ∨ b < a := by simpa [h] using lt_trichotomy a b +set_option trace.profiler true in +lemma lt_or_gt_of_ne (h : a ≠ b) : a < b ∨ b < a := by + grind lemma ne_iff_lt_or_gt : a ≠ b ↔ a < b ∨ b < a := ⟨lt_or_gt_of_ne, (Or.elim · ne_of_lt ne_of_gt)⟩ ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (523ms) Build completed successfully (61 jobs). ``` --- Show trace profiling of `min_le_left`: <10 ms before, 11 ms after ### Trace profiling of `min_le_left` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..7df1c3ca17 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -131,6 +131,7 @@ lemma min_def (a b : α) : min a b = if a ≤ b then a else b := LinearOrder.min @[grind =] lemma max_def (a b : α) : max a b = if a ≤ b then b else a := LinearOrder.max_def a b +set_option trace.profiler true in lemma min_le_left (a b : α) : min a b ≤ a := by if h : a ≤ b then simp [min_def, if_pos h, le_refl] ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (522ms) Build completed successfully (61 jobs). ``` ### Trace profiling of `min_le_left` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..5b358180c5 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -131,10 +131,9 @@ lemma min_def (a b : α) : min a b = if a ≤ b then a else b := LinearOrder.min @[grind =] lemma max_def (a b : α) : max a b = if a ≤ b then b else a := LinearOrder.max_def a b +set_option trace.profiler true in lemma min_le_left (a b : α) : min a b ≤ a := by - if h : a ≤ b - then simp [min_def, if_pos h, le_refl] - else simpa [min_def, if_neg h] using le_of_not_ge h + grind lemma min_le_right (a b : α) : min a b ≤ b := by if h : a ≤ b ``` ``` ℹ [61/61] Built Mathlib.Order.Defs.LinearOrder (537ms) info: Mathlib/Order/Defs/LinearOrder.lean:135:0: [Elab.async] [0.011028] elaborating proof of min_le_left [Elab.definition.value] [0.010868] min_le_left [Elab.step] [0.010797] grind [Elab.step] [0.010791] grind [Elab.step] [0.010784] grind Build completed successfully (61 jobs). ``` --- Show trace profiling of `min_assoc`: <10 ms before, 19 ms after ### Trace profiling of `min_assoc` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..5d78975606 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -163,6 +163,7 @@ lemma eq_min (h₁ : c ≤ a) (h₂ : c ≤ b) (h₃ : ∀ {d}, d ≤ a → d lemma min_comm (a b : α) : min a b = min b a := eq_min (min_le_right a b) (min_le_left a b) fun h₁ h₂ => le_min h₂ h₁ +set_option trace.profiler true in lemma min_assoc (a b c : α) : min (min a b) c = min a (min b c) := by apply eq_min · apply le_trans (min_le_left ..) (min_le_left ..) ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (531ms) Build completed successfully (61 jobs). ``` ### Trace profiling of `min_assoc` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..abb242c8ee 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -163,15 +163,9 @@ lemma eq_min (h₁ : c ≤ a) (h₂ : c ≤ b) (h₃ : ∀ {d}, d ≤ a → d lemma min_comm (a b : α) : min a b = min b a := eq_min (min_le_right a b) (min_le_left a b) fun h₁ h₂ => le_min h₂ h₁ +set_option trace.profiler true in lemma min_assoc (a b c : α) : min (min a b) c = min a (min b c) := by - apply eq_min - · apply le_trans (min_le_left ..) (min_le_left ..) - · apply le_min - · apply le_trans (min_le_left ..) (min_le_right ..) - · apply min_le_right - · intro d h₁ h₂; apply le_min - · apply le_min h₁; apply le_trans h₂; apply min_le_left - · apply le_trans h₂; apply min_le_right + grind lemma min_left_comm (a b c : α) : min a (min b c) = min b (min a c) := by rw [← min_assoc, min_comm a, min_assoc] ``` ``` ℹ [61/61] Built Mathlib.Order.Defs.LinearOrder (521ms) info: Mathlib/Order/Defs/LinearOrder.lean:167:0: [Elab.async] [0.019168] elaborating proof of min_assoc [Elab.definition.value] [0.018952] min_assoc [Elab.step] [0.018863] grind [Elab.step] [0.018857] grind [Elab.step] [0.018848] grind Build completed successfully (61 jobs). ``` --- Show trace profiling of `min_left_comm`: <10 ms before, 19 ms after ### Trace profiling of `min_left_comm` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..331ed67051 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -173,6 +173,7 @@ lemma min_assoc (a b c : α) : min (min a b) c = min a (min b c) := by · apply le_min h₁; apply le_trans h₂; apply min_le_left · apply le_trans h₂; apply min_le_right +set_option trace.profiler true in lemma min_left_comm (a b c : α) : min a (min b c) = min b (min a c) := by rw [← min_assoc, min_comm a, min_assoc] ``` ``` ✔ [61/61] Built Mathlib.Order.Defs.LinearOrder (529ms) Build completed successfully (61 jobs). ``` ### Trace profiling of `min_left_comm` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..dc93dd47af 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -173,8 +173,9 @@ lemma min_assoc (a b c : α) : min (min a b) c = min a (min b c) := by · apply le_min h₁; apply le_trans h₂; apply min_le_left · apply le_trans h₂; apply min_le_right +set_option trace.profiler true in lemma min_left_comm (a b c : α) : min a (min b c) = min b (min a c) := by - rw [← min_assoc, min_comm a, min_assoc] + grind @[simp] lemma min_self (a : α) : min a a = a := by simp [min_def] ``` ``` ℹ [61/61] Built Mathlib.Order.Defs.LinearOrder (522ms) info: Mathlib/Order/Defs/LinearOrder.lean:177:0: [Elab.async] [0.019701] elaborating proof of min_left_comm [Elab.definition.value] [0.019485] min_left_comm [Elab.step] [0.019416] grind [Elab.step] [0.019411] grind [Elab.step] [0.019404] grind Build completed successfully (61 jobs). ``` --- Show trace profiling of `compare_lt_iff_lt`: 23 ms before, 14 ms after 🎉 ### Trace profiling of `compare_lt_iff_lt` before PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..a38e430f94 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -223,6 +223,7 @@ lemma max_lt (h₁ : a < c) (h₂ : b < c) : max a b < c := by section Ord +set_option trace.profiler true in lemma compare_lt_iff_lt : compare a b = .lt ↔ a < b := by rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] split_ifs <;> simp only [, lt_irrefl] ``` ``` ℹ [61/61] Built Mathlib.Order.Defs.LinearOrder (521ms) info: Mathlib/Order/Defs/LinearOrder.lean:227:0: [Elab.async] [0.023362] elaborating proof of compare_lt_iff_lt [Elab.definition.value] [0.022981] compare_lt_iff_lt [Elab.step] [0.022850] rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] split_ifs <;> simp only [, lt_irrefl] [Elab.step] [0.022844] rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] split_ifs <;> simp only [, lt_irrefl] [Elab.step] [0.021754] split_ifs <;> simp only [, lt_irrefl] [Elab.step] [0.021740] focus split_ifs with_annotate_state"<;>" skip all_goals simp only [, lt_irrefl] [Elab.step] [0.021735] split_ifs with_annotate_state"<;>" skip all_goals simp only [, lt_irrefl] [Elab.step] [0.021730] split_ifs with_annotate_state"<;>" skip all_goals simp only [, lt_irrefl] [Elab.step] [0.018987] split_ifs Build completed successfully (61 jobs). ``` ### Trace profiling of `compare_lt_iff_lt` after PR 30897 ```diff diff --git a/Mathlib/Order/Defs/LinearOrder.lean b/Mathlib/Order/Defs/LinearOrder.lean index 7b6f0d5598..a97d025c43 100644 --- a/Mathlib/Order/Defs/LinearOrder.lean +++ b/Mathlib/Order/Defs/LinearOrder.lean @@ -223,9 +223,10 @@ lemma max_lt (h₁ : a < c) (h₂ : b < c) : max a b < c := by section Ord +set_option trace.profiler true in lemma compare_lt_iff_lt : compare a b = .lt ↔ a < b := by rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] - split_ifs <;> simp only [, lt_irrefl] + grind lemma compare_gt_iff_gt : compare a b = .gt ↔ b < a := by rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] ``` ``` ℹ [61/61] Built Mathlib.Order.Defs.LinearOrder (518ms) info: Mathlib/Order/Defs/LinearOrder.lean:227:0: [Elab.async] [0.014062] elaborating proof of compare_lt_iff_lt [Elab.definition.value] [0.013827] compare_lt_iff_lt [Elab.step] [0.013735] rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] grind [Elab.step] [0.013730] rw [LinearOrder.compare_eq_compareOfLessAndEq, compareOfLessAndEq] grind [Elab.step] [0.012536] grind Build completed successfully (61 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	19/60	Mathlib/Order/Defs/LinearOrder.lean	1	11	['euprunin', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	bryangingechen assignee:bryangingechen	2-21696 2 days ago	6-35802 6 days ago	6-48258 6 days
31051	joelriou author:joelriou	chore(CategoryTheory): adding grind annotations for `op_comp` and `Quiver.Hom.comp_toLoc`	This shall be used in #30189 in order to define descent data (which shall be used to define stacks). --- In the application to #30189, any of `grind =`, `grind =_` or `grind _=_` would work. I am not sure which one is the best option. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	2/2	Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Opposites.lean	2	5	['github-actions', 'joelriou', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier']	dagurtomas assignee:dagurtomas	2-21695 2 days ago	9-50571 9 days ago	15-62284 15 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/)	new-contributor t-dynamics	114/6	Mathlib/Dynamics/Transitive.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	sgouezel assignee:sgouezel	2-21695 2 days ago	9-58100 9 days ago	9-62283 9 days
31221	themathqueen author:themathqueen	chore(Algebra/Star/LinearMap): moving stuff around	Moving stuff around from `Algebra/Star/LinearMap` to other files. This way, the intrinsic star gets imported early on instead of keeping it all in one file with big imports. Also adds `LinearMap.toMatrix'_intrinsicStar : (star f).toMatrix' = f.toMatrix'.map star` and `LinearMap.isSelfAdjoint_iff_forall_isSelfAdjoint_toMatrix'_apply`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	69/38	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Star/LinearMap.lean,Mathlib/Algebra/Star/TensorProduct.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean	4	2	['github-actions', 'themathqueen']	chrisflav assignee:chrisflav	2-21693 2 days ago	9-73206 9 days ago	10-57760 10 days
31239	Paul-Lez author:Paul-Lez	feat(NumberTheory/NumberField/InfinitePlace): A few easy lemmas about totally real fields	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	15/0	Mathlib/NumberTheory/NumberField/InfinitePlace/TotallyRealComplex.lean	1	9	['Paul-Lez', 'Ruben-VandeVelde', 'github-actions', 'riccardobrasca']	jcommelin assignee:jcommelin	2-21692 2 days ago	8-70944 8 days ago	9-21571 9 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	52/0	Mathlib/Order/Filter/Cofinite.lean,Mathlib/Order/Lattice.lean	2	1	['github-actions']	bryangingechen assignee:bryangingechen	2-21691 2 days ago	10-13223 10 days ago	10-13213 10 days
31250	joelriou author:joelriou	feat(AlgebraicTopology): inductive construction of StrictSegal structures	We obtain a computable `StrictSegal (nerve C)` structure by using an inductive construction based on a new `StrictSegalCore` structure which provides a way to construct a `n + 1`-simplex by from a `1`-simplex and a `n`-simplex satisfying a compatibility. --- - [x] depends on: #31248 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology maintainer-merge	177/29	Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean	4	20	['emilyriehl', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'robin-carlier']	dagurtomas assignee:dagurtomas	2-21689 2 days ago	9-52267 9 days ago	9-62564 9 days
31256	jsm28 author:jsm28	feat(Geometry/Euclidean/SignedDist): `signedInfDist_reindex`	Add a lemma saying how `Affine.Simplex.signedInfDist` interacts with `Affine.Simplex.reindex`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	5/0	Mathlib/Geometry/Euclidean/SignedDist.lean	1	1	['github-actions']	JovanGerb assignee:JovanGerb	2-21688 2 days ago	9-72259 9 days ago	9-72234 9 days
31257	jsm28 author:jsm28	feat(LinearAlgebra/AffineSpace/Simplex/Basic): more `reindex` lemmas	Add lemmas about how `reindex` interacts with `restrict`, `setInterior`, `interior` and `closedInterior`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	35/0	Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	1	1	['github-actions']	riccardobrasca assignee:riccardobrasca	2-21687 2 days ago	9-70221 9 days ago	9-70197 9 days
31258	joelriou author:joelriou	chore(CategoryTheory/Limits/Types): split Shapes.lean	The file `CategoryTheory.Limits.Types.Shapes` is split in several files corresponding to different kinds of shapes of limits/colimits. (As that constructions are not self-dual, dual shapes appear in separate files, e.g. `Pushouts` and `Pullbacks`.) --- (The `large-import` warning is obviously a false positive...) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	1131/1025	Mathlib.lean,Mathlib/Algebra/Category/Grp/Adjunctions.lean,Mathlib/AlgebraicGeometry/GluingOneHypercover.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/GlueData.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesProduct.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/Pi.lean,Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean,Mathlib/CategoryTheory/Limits/Shapes/Reflexive.lean,Mathlib/CategoryTheory/Limits/Types/Coequalizers.lean,Mathlib/CategoryTheory/Limits/Types/Coproducts.lean,Mathlib/CategoryTheory/Limits/Types/Equalizers.lean,Mathlib/CategoryTheory/Limits/Types/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Types/Products.lean,Mathlib/CategoryTheory/Limits/Types/Pullbacks.lean,Mathlib/CategoryTheory/Limits/Types/Pushouts.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean,Mathlib/CategoryTheory/Sites/MayerVietorisSquare.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean,Mathlib/Geometry/RingedSpace/LocallyRingedSpace/HasColimits.lean,Mathlib/Topology/Category/TopCat/Yoneda.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean	29	1	['github-actions']	robin-carlier assignee:robin-carlier	2-21686 2 days ago	9-68355 9 days ago	9-68394 9 days
31259	YaelDillies author:YaelDillies	refactor(Dynamics): use `SetRel` notions of separation and cover	... instead of the handmade ones. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics	173/203	Mathlib/Data/Rel/Cover.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/Topology/UniformSpace/Defs.lean	7	1	['github-actions']	urkud assignee:urkud	2-21685 2 days ago	8-74849 8 days ago	8-74824 8 days
31294	erdOne author:erdOne	feat(Analysis): Weierstrass ℘ functions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	274/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Elliptic/Weierstrass.lean	2	2	['github-actions', 'grunweg']	urkud assignee:urkud	2-21681 2 days ago	8-45563 8 days ago	8-45604 8 days
31309	gasparattila author:gasparattila	feat(Probability/Independence): reindexing lemmas for `iIndep*`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	105/30	Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/Kernel.lean	2	3	['EtienneC30', 'gasparattila', 'github-actions']	sgouezel assignee:sgouezel	2-21680 2 days ago	8-28445 8 days ago	8-28482 8 days
31315	Parcly-Taxel author:Parcly-Taxel	feat: IMO 2010 Q5	I use an opaque power function to avoid `(kernel) deep recursion detected`. Cf. [#general > Panic in rw: Nat.pow exponent is too big @ 💬](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/Panic.20in.20rw.3A.20Nat.2Epow.20exponent.20is.20too.20big/near/513294906).	IMO	252/0	Archive.lean,Archive/Imo/Imo2010Q5.lean	2	2	['github-actions', 'jsm28']	dwrensha assignee:dwrensha	2-21679 2 days ago	8-10417 8 days ago	8-10398 8 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/)	t-meta	720/0	Mathlib.lean,Mathlib/Util/Inspect.lean,MathlibTest/Inspect.lean	3	2	['github-actions', 'plp127']	kim-em assignee:kim-em	2-21677 2 days ago	6-66402 6 days ago	6-66436 6 days
31358	erdOne author:erdOne	feat(RingTheory): universal factorization map of polynomials	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		220/0	Mathlib.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	1	['github-actions']	dwrensha assignee:dwrensha	2-21676 2 days ago	6-65539 6 days ago	6-65513 6 days
31371	euprunin author:euprunin	chore(RingTheory): golf `RingTheory/` using `order`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		11/20	Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	6	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	EtienneC30 assignee:EtienneC30	2-21675 2 days ago	6-20417 6 days ago	6-28443 6 days
31387	gasparattila author:gasparattila	feat(Topology/Separation): condition for regularity given a subbasis	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	19/0	Mathlib/Topology/Separation/Regular.lean	1	1	['github-actions', 'plp127']	j-loreaux assignee:j-loreaux	2-21675 2 days ago	5-46754 5 days ago	5-46785 5 days
31389	YaelDillies author:YaelDillies	chore: golf proofs involving permutations	This reduces the diff of #27433. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		175/247	Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean	11	7	['YaelDillies', 'github-actions', 'plp127']	kex-y assignee:kex-y	2-21674 2 days ago	5-39813 5 days ago	5-39787 5 days
31400	joelriou author:joelriou	feat(CategoryTheory): deriving functors using a right derivability structure	We develop the API for derived functors following the existence theorem obtained in #26374. If `Φ` is a localizer morphism, we introduce a predicate `Φ.Derives F` for a functor `F` saying that `Φ.functor ⋙ F` inverts the given class of morphisms, and in case `Φ` is a right derivability structure, we show that `F` admits a right derived functor, and we obtain a recognition lemma for this derived functor. (In the future, this will be applied to the injective/projective/flat derivability structures.) --- - [x] depends on: #26374 - [x] depends on: #22474 - [x] depends on: #26036 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	117/1	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Derives.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	2-21669 2 days ago	5-30666 5 days ago	5-30641 5 days
31401	SnirBroshi author:SnirBroshi	feat(NumberTheory/Real/GoldenRatio): add two more fib identities	--- In case using `grind` here is considered too fragile, there are alternative proofs without `grind` in the first commit, let me know if I should switch to them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	8/0	Mathlib/NumberTheory/Real/GoldenRatio.lean	1	1	['github-actions']	mariainesdff assignee:mariainesdff	2-21668 2 days ago	5-30689 5 days ago	5-30721 5 days
31526	Aaron1011 author:Aaron1011	feat: Add multiplicative version of structure theorem for finitely generated abelian groups	This is similar to the multiplicative version of the structure theorem for finite abelian groups (using a pi type instead of a direct sum) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory new-contributor	18/0	Mathlib/GroupTheory/FiniteAbelian/Basic.lean	1	1	['github-actions']	nobody	2-20729 2 days ago	2-20731 2 days ago	2-20770 2 days
28266	euprunin author:euprunin	chore(RingTheory): golf entire `single_one_eq_pow` using `simp`. deprecate `single_inv`.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	4/6	Mathlib/RingTheory/LaurentSeries.lean	1	10	['erdOne', 'eric-wieser', 'euprunin', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	2-19287 2 days ago	6-46882 6 days ago	6-58232 6 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/)	t-analysis WIP	51/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-15701 2 days ago	unknown	unknown
31528	bwangpj author:bwangpj	feat: MulAction.fixedPoints and MulAction.fixedBy under MulActionHom	MulActionHom maps fixedPoints to fixedPoints and fixedBy to fixedBy. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory large-import	33/1	Mathlib/GroupTheory/GroupAction/FixedPoints.lean	1	0	[]	nobody	2-10714 2 days ago	2-10796 2 days ago	2-10829 2 days
31502	urkud author:urkud	feat: add a version of Bernoulli's inequality	Motivated by #31492 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	82/21	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Ring/Pow.lean	2	1	['github-actions']	nobody	2-10695 2 days ago	2-10734 2 days ago	2-83211 2 days
24019	urkud author:urkud	feat(Analysis): Poincaré lemma for 1-forms	--- - [x] depends on: #30569 - [ ] depends on: #30544 - [ ] depends on: #30506 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	404/4	Mathlib.lean,Mathlib/Analysis/Calculus/TangentCone/Basic.lean,Mathlib/Analysis/Normed/Operator/Bilinear.lean,Mathlib/MeasureTheory/Integral/CurveIntegral/Poincare.lean	4	7	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-86290 1 day ago	2-3389 2 days ago	70-43346 70 days
30331	urkud author:urkud	feat(Calculus): derivative of `ContinuousAlternatingMap.compContinuousLinearMap`	--- - [ ] depends on: #30182 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	359/9	Mathlib.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean	6	13	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	1-84531 1 day ago	1-84531 1 day ago	7-22899 7 days
30950	jessealama author:jessealama	feat: add AffineEquiv.ofLinearEquiv	Adds a constructor for building affine equivalences from linear equivalences and base points. --- Extracted from #30854. cc @Vierkantor @YaelDillies	t-algebra delegated label:t-algebra$	42/0	Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean	1	25	['YaelDillies', 'github-actions', 'j-loreaux', 'jessealama', 'jsm28', 'mathlib-bors']	nobody	1-82312 1 day ago	2-34594 2 days ago	2-37505 2 days
31376	euprunin author:euprunin	chore: use `order` instead of `linarith` to make the intent clearer	--- Separated from the non-`linarith` cases for benchmarking reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		57/55	Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrals/PosLogEqCircleAverage.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/FieldTheory/PrimitiveElement.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferentiationThm.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/Ostrowski.lean,Mathlib/Probability/Distributions/Exponential.lean,Mathlib/Probability/Distributions/Gamma.lean,Mathlib/Probability/StrongLaw.lean	32	7	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	1-78883 1 day ago	1-78923 1 day ago	5-53549 5 days
31530	euprunin author:euprunin	chore(Data/List): golf entire `drop_length_sub_one` using `ext; grind`	--- Show trace profiling of `drop_length_sub_one`: 131 ms before, 272 ms after ### Trace profiling of `drop_length_sub_one` before PR 31530 ```diff diff --git a/Mathlib/Data/List/TakeDrop.lean b/Mathlib/Data/List/TakeDrop.lean index 7598f40935..efa3cdfbb1 100644 --- a/Mathlib/Data/List/TakeDrop.lean +++ b/Mathlib/Data/List/TakeDrop.lean @@ -68,6 +68,7 @@ theorem cons_get_drop_succ {l : List α} {n} : l.get n :: l.drop (n.1 + 1) = l.drop n.1 := (drop_eq_getElem_cons n.2).symm +set_option trace.profiler true in lemma drop_length_sub_one {l : List α} (h : l ≠ []) : l.drop (l.length - 1) = [l.getLast h] := by induction l with \| nil => aesop ``` ``` ℹ [436/436] Built Mathlib.Data.List.TakeDrop (1.2s) info: Mathlib/Data/List/TakeDrop.lean:72:0: [Elab.async] [0.131338] elaborating proof of List.drop_length_sub_one [Elab.definition.value] [0.130820] List.drop_length_sub_one [Elab.step] [0.130582] induction l with \| nil => aesop \| cons a l ih => by_cases hl : l = [] · simp_all rw [length_cons, Nat.add_one_sub_one, List.drop_length_cons hl a] simp [getLast_cons, hl] [Elab.step] [0.130577] induction l with \| nil => aesop \| cons a l ih => by_cases hl : l = [] · simp_all rw [length_cons, Nat.add_one_sub_one, List.drop_length_cons hl a] simp [getLast_cons, hl] [Elab.step] [0.130571] induction l with \| nil => aesop \| cons a l ih => by_cases hl : l = [] · simp_all rw [length_cons, Nat.add_one_sub_one, List.drop_length_cons hl a] simp [getLast_cons, hl] [Elab.step] [0.124915] aesop [Elab.step] [0.124908] aesop [Elab.step] [0.124896] aesop [aesop.forward] [0.025181] building initial forward state [aesop] [0.017932] ✅️ (G0) [100.0000%] ⋯ ⊢ drop ([].length - 1) [] = [[].getLast h] [aesop] [0.013220] ✅️ Safe rules [aesop] [0.014939] 🏁 (G1) [100.0000%] ⋯ ⊢ drop ([].length - 1) [] = [[].getLast h] [aesop] [0.014777] 🏁 Normalisation Build completed successfully (436 jobs). ``` ### Trace profiling of `drop_length_sub_one` after PR 31530 ```diff diff --git a/Mathlib/Data/List/TakeDrop.lean b/Mathlib/Data/List/TakeDrop.lean index 7598f40935..d5c64d154e 100644 --- a/Mathlib/Data/List/TakeDrop.lean +++ b/Mathlib/Data/List/TakeDrop.lean @@ -68,14 +68,10 @@ theorem cons_get_drop_succ {l : List α} {n} : l.get n :: l.drop (n.1 + 1) = l.drop n.1 := (drop_eq_getElem_cons n.2).symm +set_option trace.profiler true in lemma drop_length_sub_one {l : List α} (h : l ≠ []) : l.drop (l.length - 1) = [l.getLast h] := by - induction l with - \| nil => aesop - \| cons a l ih => - by_cases hl : l = [] - · simp_all - rw [length_cons, Nat.add_one_sub_one, List.drop_length_cons hl a] - simp [getLast_cons, hl] + ext + grind section TakeI ``` ``` ℹ [436/436] Built Mathlib.Data.List.TakeDrop (1.4s) info: Mathlib/Data/List/TakeDrop.lean:72:0: [Elab.async] [0.273157] elaborating proof of List.drop_length_sub_one [Elab.definition.value] [0.272410] List.drop_length_sub_one [Elab.step] [0.272252] ext grind [Elab.step] [0.272245] ext grind [Elab.step] [0.271667] grind info: Mathlib/Data/List/TakeDrop.lean:74:2: [Elab.async] [0.030869] Lean.addDecl [Kernel] [0.030851] ✅️ typechecking declarations [List.drop_length_sub_one._proof_1_24] Build completed successfully (436 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/7	Mathlib/Data/List/TakeDrop.lean	1	1	['github-actions']	nobody	1-77724 1 day ago	1-78987 1 day ago	1-79023 1 day
30389	euprunin author:euprunin	fix: correctly apply `hint` priority (was always set to default 1000 due to a bug)	Fixes #29831. In addition to fixing the bug, this PR also adjusts the (now-working) tactic priorities to ensure that: * `bound` is tested _after_ `aesop` (`bound` calls `aesop` and is therefore stronger) * `group` is tested _after_ `ring` (`group` calls `ring` and is therefore stronger) A bug in the parsing code below caused the priority value to be ignored, resulting in all hints using the default priority of 1000 regardless of the `register_hint` priority parameter: ```lean elab (name := registerHintStx) "register_hint" p:("(" "priority" ":=" num ")")? tac:tactic : command => liftTermElabM do -- remove comments let prio := match p with \| some stx => match stx.raw[3]?.bind Syntax.isNatLit? with \| some n => n \| none => 1000 \| none => 1000 let tac : TSyntax `tactic := ⟨tac.raw.copyHeadTailInfoFrom .missing⟩ addHint prio tac ``` Fixed by simplifying the syntax to take a mandatory numeric priority argument and extracting it directly via `prio.raw.isNatLit?`, removing the index-based parsing and the silent fallback to 1000. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta bug	275/201	Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/Field.lean,Mathlib/Tactic/FieldSimp.lean,Mathlib/Tactic/Finiteness.lean,Mathlib/Tactic/GCongr.lean,Mathlib/Tactic/Group.lean,Mathlib/Tactic/Hint.lean,Mathlib/Tactic/Linarith.lean,Mathlib/Tactic/NoncommRing.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/RingNF.lean,MathlibTest/hint.lean,MathlibTest/hintAll.lean	17	19	['BoltonBailey', 'Vierkantor', 'euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	1-76510 1 day ago	6-50001 6 days ago	30-6407 30 days
31539	joelriou author:joelriou	feat(CategoryTheory/Triangulated): basic lemmas for t-structures	This PR adds a few very basic lemmas about `t`-structures. For example `t.IsLE (X⟦a⟧) n' ↔ t.IsLE X n` when `a + n' = n`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	60/0	Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean	1	1	['github-actions']	nobody	1-74469 1 day ago	1-74567 1 day ago	1-74542 1 day
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/)	t-meta awaiting-author	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	109	['JovanGerb', 'adamtopaz', 'chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'kckennylau', 'kim-em', 'plp127', 'robertmaxton42', 'sgouezel']	adamtopaz assignee:adamtopaz	1-74459 1 day ago	1-74459 1 day ago	69-30520 69 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: #27416 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	258/10	Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	4	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-74405 1 day ago	unknown	unknown
26210	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): associated primes of localized module	We prove that `Ass(S^{-1}M)` is equal to the preimage of `Ass(M)` under `Ideal.comap` if the base ring is Noetherian. From this we conclude that every minimal prime over `Module.annihilator R M` is in `Ass(M)` when `M` is finitely generated. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import awaiting-author	85/22	Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Depth.lean	2	30	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot', 'mbkybky']	chrisflav assignee:chrisflav	1-73777 1 day ago	80-15234 2 months ago	36-71207 36 days
24730	YaelDillies author:YaelDillies	feat(RingTheory): group-like elements	Define group-like elements in a bialgebra, ie elements such that `η a = 1` and `Δ a = a ⊗ₜ a`. We prove that group-like elements of a coalgebra over a domain are linearly independent, group-like elements of a bialgebra form a monoid, group-like elements of a Hopf algebra form a group. From Toric Co-authored-by: Michał Mrugała --- - [x] depends on: #24747 - [x] depends on: #31515 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory toric	315/0	Mathlib.lean,Mathlib/RingTheory/Bialgebra/GroupLike.lean,Mathlib/RingTheory/Coalgebra/GroupLike.lean,Mathlib/RingTheory/HopfAlgebra/GroupLike.lean	4	81	['Julian-Kuelshammer', 'Parcly-Taxel', 'Whysoserioushah', 'YaelDillies', 'erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'kim-em', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'smorel394']	eric-wieser assignee:eric-wieser	1-72968 1 day ago	1-73157 1 day ago	182-48906 182 days
31536	joelriou author:joelriou	feat(CategoryTheory/Triangulated): the category of triangles is preadditive	--- Note that `Linear.LinearFunctor` is already imported by the other files in this directory like `TriangleShift` or `Pretriangulated`), so that the `large-import` label could be ignored. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	103/0	Mathlib/CategoryTheory/Triangulated/Basic.lean	1	1	['github-actions']	nobody	1-72938 1 day ago	1-76083 1 day ago	1-76123 1 day
31537	RemyDegenne author:RemyDegenne	feat: totally bounded sets have finite covers	New result: a totally bounded set has finite `ε`-covers for all `ε > 0`. I then use it to golf and generalize `exists_finite_isCover_of_isCompact_closure` and `exists_finite_isCover_of_isCompact` to extended pseudo-metric spaces. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	36/17	Mathlib/Data/Rel/Cover.lean,Mathlib/Topology/MetricSpace/Cover.lean	2	7	['YaelDillies', 'github-actions']	nobody	1-71856 1 day ago	1-71856 1 day ago	1-73558 1 day
28599	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory) : polynomial over CM ring is CM	polynomial over Cohen Macaulay ring is Cohen Macaulay --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import WIP	2200/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Polynomial.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	9	n/a	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-70000 1 day ago	unknown	unknown
28582	Thmoas-Guan author:Thmoas-Guan	feat(Data): some lemmas about WithBot ENat	Add some lemma about withBot ENat discovered when dealing with `ringKrullDim` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	25/0	Mathlib/Data/ENat/Basic.lean	1	8	['Ruben-VandeVelde', 'Thmoas-Guan', 'github-actions', 'pechersky']	pechersky assignee:pechersky	1-69471 1 day ago	39-37528 1 month ago	37-18097 37 days
28682	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): definition of regular local ring	In this PR, we give the definition of regular local ring. The class `IsRegularLocalRing` is defined as `(maximalIdeal R).spanFinrank = ringKrullDim R` We also established the lemma `IsRegularLocalRing.iff_finrank_cotangentSpace` proving this definition is equivalent to the cotangent space version. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	117/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	2	36	['Thmoas-Guan', 'chrisflav', 'github-actions', 'mathlib4-merge-conflict-bot', 'mbkybky']	chrisflav assignee:chrisflav	1-69357 1 day ago	16-420 16 days ago	1-63449 1 day
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` --- - [x] depends on: #29882 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory awaiting-author	212/0	Mathlib.lean,Mathlib/RingTheory/GlobalDimension.lean	2	12	['Thmoas-Guan', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	1-68722 1 day ago	24-29059 24 days ago	27-39065 27 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	394/0	Mathlib.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/NormNumI.lean,MathlibTest/norm_numI.lean	5	53	['JovanGerb', 'Whysoserioushah', 'dupuisf', 'eric-wieser', 'github-actions', 'hrmacbeth']	robertylewis assignee:robertylewis	1-67155 1 day ago	119-45834 3 months ago	119-50138 119 days
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/)		162/0	Mathlib.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-67033 1 day ago	1-67053 1 day ago	8-82539 8 days
31543	grunweg author:grunweg	chore: rename FiniteDimensional.of_fintype_basis	The lemma has a Finite hypothesis now, not a Fintype one. The new name was discussed on zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/555088215 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	37/33	Archive/Sensitivity.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/BilinearForm/DualLattice.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/Complex/FiniteDimensional.lean,Mathlib/LinearAlgebra/FiniteDimensional/Defs.lean,Mathlib/LinearAlgebra/PerfectPairing/Restrict.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean,Mathlib/NumberTheory/FunctionField.lean,Mathlib/RingTheory/Norm/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/Topology/Algebra/Module/FiniteDimension.lean	15	1	['github-actions']	nobody	1-65974 1 day ago	1-71165 1 day ago	1-71238 1 day
31540	themathqueen author:themathqueen	chore: move `LinearAlgebra/Matrix/HermitianFunctionalCalculus` to `Analysis/Matrix`	`Analysis/Matrix` is a more appropriate location for this as these are analysis results and depends on `Analysis/Matrix/Spectrum`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed maintainer-merge t-analysis	2/2	Mathlib.lean,Mathlib/Analysis/Matrix/HermitianFunctionalCalculus.lean,Mathlib/Analysis/Matrix/Order.lean	3	6	['Vierkantor', 'github-actions', 'grunweg']	nobody	1-65884 1 day ago	1-71958 1 day ago	1-73460 1 day
30083	grunweg author:grunweg	feat: local frames in a vector bundle	We construct local frames on a vector from local trivialisations. The former constructs, given a trivialisation `e` of the vector bundle and a basis of the model fibre, `Basis.localFrame` is a local frame on `e.baseSet` A future PR will use this to define the local extension of a tangent vector to a vector field near a point. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- - [x] depends on: #27021 - [x] depends on: #30338 - [x] depends on: #31542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	320/22	Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean	1	41	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	ocfnash assignee:ocfnash	1-65266 1 day ago	1-65771 1 day ago	14-62880 14 days
31550	RemyDegenne author:RemyDegenne	feat: properties of sub-Gaussian random variables	Add several simple lemmas, and the fact that for `X, Y` two independent sub-Gaussian random variables such that `μ[X] ≥ μ[Y]`, the probability that `X ≤ Y` is bounded by an exponential function of `(μ[X] - μ[Y])^2`. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	93/0	Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/IntegrableExpMul.lean,Mathlib/Probability/Moments/SubGaussian.lean	3	1	['github-actions']	nobody	1-64774 1 day ago	1-64779 1 day ago	1-64822 1 day
31511	bwangpj author:bwangpj	feat: fixed points of normal subgroup is stable under the group action	The set of fixed points of a normal subgroup is stable under the group action. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	34/0	Mathlib/GroupTheory/GroupAction/SubMulAction.lean	1	3	['ADedecker', 'bwangpj', 'github-actions']	nobody	1-64615 1 day ago	2-54420 2 days ago	2-54453 2 days
31027	YaelDillies author:YaelDillies	chore: shortcut instance for `Nat` to be mul-torsion-free	This instance can already be found by typeclass search using the fact that `Nat` is a `LinearOrderedCommMonoidWithZero`, but it is better practice to not rely on algebraic order theory to prove algebraic results about such basic types. Similarly for `IsAddTorsionFree Int`. From ClassFieldTheory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT t-algebra label:t-algebra$	6/0	Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean	2	2	['github-actions', 'plp127']	mattrobball assignee:mattrobball	1-63650 1 day ago	11-46109 11 days ago	16-46413 16 days
31430	gasparattila author:gasparattila	feat(Topology/Sets): `Unique`, `Nontrivial`, etc. instances for `(Nonempty)Compacts`	--- - [x] depends on: #31379 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/Sets/Compacts.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-61127 1 day ago	1-61142 1 day ago	1-62464 1 day
31487	b-mehta author:b-mehta	feat(SpecialFunctions/Log): tight bounds on artanh(x)	We provide tight bounds, thanks to Taylor series, on `1/2 (log ((1+x)/(1-x)))`. It is more convenient, however, to avoid Taylor series in the proof, since the geometric sum formula can be used to more easily calculate the difference. From the [exponential-ramsey project](https://github.com/b-mehta/exponential-ramsey/blob/main/src/log_small.lean), and used to give [very tight estimates on logs (Zulip)](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/A.20million.20digits.20of.20log.202/with/554793210). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	94/0	Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean	1	n/a	['b-mehta', 'github-actions', 'j-loreaux']	nobody	1-60207 1 day ago	unknown	unknown
31549	ADedecker author:ADedecker	feat: more API on tsupport and operations on functions	Variants of [Function.mulSupport_one](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Notation/Support.html#Function.mulSupport_one), [Function.mulSupport_binop_subset](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Notation/Support.html#Function.mulSupport_binop_subset), [Function.mulSupport_inv](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Group/Support.html#Function.mulSupport_inv), [Function.mulSupport_div](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Group/Support.html#Function.mulSupport_div)... for the topological support. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	52/9	Archive/Hairer.lean,Mathlib/Topology/Algebra/Support.lean	2	1	['github-actions']	nobody	1-59923 1 day ago	1-65005 1 day ago	1-65042 1 day
31555	EtienneC30 author:EtienneC30	feat: bounded distance implies bounded space	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	24/0	Mathlib/Topology/MetricSpace/Pseudo/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	2	1	['github-actions']	nobody	1-58426 1 day ago	1-58489 1 day ago	1-58464 1 day
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	large-import WIP	8134/324	Mathlib.lean,Mathlib/Algebra/Lie/Abelian.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/Loop.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.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/Vertex/Affine.lean,Mathlib/Algebra/Vertex/Basic.lean,Mathlib/Algebra/Vertex/Defs.lean,Mathlib/Algebra/Vertex/HVertexOperator.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,Mathlib/RingTheory/PowerSeries/Eval.lean	41	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	1-57959 1 day ago	unknown	unknown
30928	themathqueen author:themathqueen	chore(LinearAlgebra/Matrix/PosDef): rename `Matrix.InnerProductSpace.ofMatrix`	- Renames `Matrix.NormedAddCommGroup.ofMatrix` to `Matrix.PosDef.normedAddCommGroup` - Removes `Matrix.InnerProductSpace.ofMatrix` and adds `Matrix.PosSemidef.innerProductSpace` instead. - Removes `Matrix.PosDef.matrixInnerProductSpace` and adds `Matrix.PosSemidef.matrixInnerProductSpace` instead. - Defines `Matrix.PosSemidef.seminormedAddCommGroup` and `Matrix.PosSemidef.matrixSeminormedAddCommGroup`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	71/41	Mathlib/Analysis/Matrix/Order.lean,Mathlib/LinearAlgebra/Matrix/LDL.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	3	22	['YaelDillies', 'eric-wieser', 'github-actions', 'riccardobrasca', 'themathqueen']	riccardobrasca assignee:riccardobrasca	1-57791 1 day ago	1-74079 1 day ago	18-64022 18 days
31514	staroperator author:staroperator	feat(Order): reprove Dickson's lemma	Reprove Dickson's lemma `Pi.wellQuasiOrderedLE` under assumption of preorder and well-quasi-order, and generalize it to any relation and/or product of well-quasi-ordered sets. Also add an instance of `WellQuasiOrderedLE` from `LinearOrder` and `WellFoundedLT`. `Pi.isPWO` and `Finsupp.isPWO` are deprecated since they are superseded by `isPWO_of_wellQuasiOrderedLE` and instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	89/33	Mathlib/Data/Finsupp/PWO.lean,Mathlib/Order/Preorder/Finsupp.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/Order/WellQuasiOrder.lean,Mathlib/RingTheory/HahnSeries/PowerSeries.lean	5	7	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	1-57298 1 day ago	2-11477 2 days ago	2-52321 2 days
27107	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/SubMulAction/Combination) : combinations and group actions	`Nat.Combination X n` is the type all `s : Finset X` such that `s.card = n`. This PR provides some API for this subtype and the `SubMulAction` it inherits when a group acts on `X`. It will be used in conjunction with the description of some maximal subgroups of `Equiv.Perm X` to construct primitive actions. Question on the names: when `X` is a fintype, there is `Finset.powersetCard` that gives the same object, as a `Finset`. But the present PR also applies when `X` is infinite. Then maybe `Nat.Combination` should be renamed as `Set.powersetCard`? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	336/0	Mathlib.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Combination.lean	4	40	['AntoineChambert-Loir', 'alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot', 'tb65536']	alreadydone assignee:alreadydone	1-55815 1 day ago	1-55834 1 day ago	122-54774 122 days
31548	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Analysis/Convex/Quasiconvex): properties of quasiconcave functions	Prove properties of quasiconcave/quasiconvex functions: * monotony * restriction * connectedness of preimages Co-authored with: @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	107/1	Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Data/Set/Basic.lean	2	1	['github-actions']	nobody	1-55730 1 day ago	1-65713 1 day ago	1-65747 1 day
31547	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Analysis/Convex/SaddlePoint): define saddle points of a map	* `IsSaddlePointOn`. Let `f : E × F → β` be a map, where `β` is preordered. A pair `(a,b)` in `E × F` is a saddle point of `f` on `X × Y` if `f a y ≤ f x b` for all `x ∈ X` and all `y `in Y`. * `isSaddlePointOn_iff`: if `β` is a complete linear order, then `(a, b) ∈ X × Y` is a saddle point on `X × Y` iff `⨆ y ∈ Y, f a y = ⨅ x ∈ X f x b = f a b`. Co-authored-by: @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	228/0	Mathlib.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SaddlePoint.lean,Mathlib/Data/Set/Basic.lean	4	1	['github-actions']	nobody	1-55722 1 day ago	1-65816 1 day ago	1-65847 1 day
31326	sgouezel author:sgouezel	chore: deprecate `smooth` variants of `contMDiff` results	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	22/41	Mathlib/Geometry/Manifold/PartitionOfUnity.lean	1	6	['github-actions', 'grunweg', 'sgouezel']	grunweg assignee:grunweg	1-55271 1 day ago	5-39446 5 days ago	5-49803 5 days
31403	JovanGerb author:JovanGerb	feat(push_neg): tag `not_frequently` and `not_eventually`	This PR add support for `not_frequently` and `not_eventually` in the `push_neg` tactic, and it refactors some proofs using this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta delegated	46/63	Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Asymptotics/LinearGrowth.lean,Mathlib/Analysis/Calculus/Deriv/Inverse.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Markov.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/NumberTheory/Transcendental/Liouville/LiouvilleWith.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Prod.lean,Mathlib/Order/Filter/Ultrafilter/Defs.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Semicontinuous.lean	19	15	['ADedecker', 'JovanGerb', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	1-53885 1 day ago	2-46018 2 days ago	2-64700 2 days
31166	gasparattila author:gasparattila	feat(Topology/Sets): add `NonemptyCompacts.map`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	34/0	Mathlib/Topology/Sets/Compacts.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	1-53759 1 day ago	12-41979 12 days ago	12-42020 12 days
30201	luigi-massacci author:luigi-massacci	feat: add differentiation for ContDiffMapSupportedIn	Add a wrapper for `iteratedFDeriv` on `ContDiffMapSupportedIn` and related API. --- - [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/)	maintainer-merge t-analysis	180/11	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean	2	44	['ADedecker', 'github-actions', 'grunweg', 'luigi-massacci', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-53606 1 day ago	1-59433 1 day ago	5-50320 5 days
31046	Thmoas-Guan author:Thmoas-Guan	feat(Homology) : map between `Ext` induced by exact functor	In this PR, we developed the additive map `Ext(M,N) => Ext(F(M), F(N))` when `F` is exact functor between abelian category. We also developed its linear version when `F` is linear. Co-authored-by: Wang Jingting --- - [x] depends on: #31004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		475/0	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-52930 1 day ago	1-65783 1 day ago	1-65812 1 day
31554	bwangpj author:bwangpj	feat: define Subrepresentation	This is upstreamed from the FLT project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-algebra label:t-algebra$	108/0	Mathlib.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/RepresentationTheory/Subrepresentation.lean	3	1	['github-actions']	nobody	1-48508 1 day ago	1-58863 1 day ago	1-59225 1 day
31541	RemyDegenne author:RemyDegenne	feat: Monotonicity of hitting times	Monotonicity of hitting times with respect to their various arguments (set, minimal time, maximal time). From the Brownian motion project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	118/7	Mathlib/Probability/Process/HittingTime.lean	1	7	['EtienneC30', 'github-actions']	nobody	1-47170 1 day ago	1-47170 1 day ago	0-26194 7 hours
28884	kim-em author:kim-em	chore: deprecate ShiftLeft Int instance	This PR proposes deprecating the `ShiftLeft Int` instance (which allows bit-shifting an integer by an integer), and similarly for `ShiftRight`. These are unused in Mathlib. I'm happy if someone wants to keep this, but I would ask that they: * fix the doc-strings to explain what happens for negative shifts * ~~restores the theorem `Int.shiftLeft_add` which I've commented out on `nightly-testing` (and then revert b33c9d7aaea on `nightly-testing`).~~ * ideally but optionally, complete the API, e.g. reducing shifts by casts back to shifts by a Nat	t-data	22/3	Mathlib/Data/Int/Bitwise.lean	1	9	['Rob23oba', 'eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot', 'pechersky']	pechersky assignee:pechersky	1-35845 1 day ago	59-21721 1 month ago	80-76214 80 days
31559	joelriou author:joelriou	feat(Algebra/Homology): a factorization of morphisms of cochain complexes	Let `C` be an abelian category with enough injectives. We show that any morphism `f : K ⟶ L` between bounded below cochain complexes in `C` can be factored as `i ≫ p` where `i : K ⟶ L'` is a monomorphism (with `L'` bounded below) and `p : L' ⟶ L` a quasi-isomorphism that is an epimorphism with a degreewise injective kernel. (This is part of the factorization axiom CM5 for a model category structure on bounded below cochain complexes.) (This shall be used in the formalization of right derived functors using injective resolutions.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	186/32	Mathlib.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Factorizations/CM5b.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/CategoryTheory/Preadditive/Injective/Basic.lean	6	1	['github-actions']	nobody	1-42043 1 day ago	1-49450 1 day ago	1-49426 1 day
26014	CBirkbeck author:CBirkbeck	feat: define the Eisenstein Series E2	This PR continues the work from #24822. Original PR: https://github.com/leanprover-community/mathlib4/pull/24822 - [ ] depends on : #27606 - [ ] depends on: #30380	large-import t-number-theory	1195/18	Mathlib.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Data/Int/Interval.lean,Mathlib/NumberTheory/IntervalSums.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Summable.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2/Transform.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/Order/Filter/AtTopBot/Finset.lean,Mathlib/Topology/Algebra/InfiniteSum/Defs.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/Monoid/Defs.lean	16	7	['CBirkbeck', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-41591 1 day ago	35-48249 1 month ago *	0-0 0 seconds *
30870	tb65536 author:tb65536	refactor(FieldTheory/*): partially switch over from `Polynomial.Splits` to `Polynomial.Factors`	This PR is part of a larger effort to switch over from `Polynomial.Splits` to `Polynomial.Factors`. I'm avoiding changing names to avoid lots of deprecated aliases during the transition period. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	92/87	Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/Polynomial/Factors.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Complex/Polynomial/GaussLucas.lean,Mathlib/Analysis/Matrix/Spectrum.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/FieldTheory/SplittingField/IsSplittingField.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/RingTheory/Norm/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Vieta.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/Topology/Algebra/Polynomial.lean	21	5	['github-actions', 'mathlib4-merge-conflict-bot', 'riccardobrasca', 'tb65536']	riccardobrasca assignee:riccardobrasca	1-40081 1 day ago	1-43171 1 day ago	12-74505 12 days
31497	staroperator author:staroperator	feat(Algebra/Group): semigroup ideals	This PR defines semigroup ideals; they are different from (in fact, a weaker form of) ring ideals. We prove that in a monoid whose algebraic order is well-quasi-order, all semigroup ideals are finitely generated, and the semigroup ideals satisfy the ascending chain condition. These definitions and results are useful in #27414. Note: Following `Ideal` with `Submodule`, `SemigroupIdeal M` is an `abbrev` of `SubMulAction M M`. Also, `Ideal.closure` is a re-definition of `SubMulAction.closure` and `Ideal.FG` is defeq to `SubMulAction.FG` but unfolds more nicely. --- - [x] depends on: #31517 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-algebra label:t-algebra$	194/0	Mathlib.lean,Mathlib/Algebra/Group/Ideal.lean,Mathlib/Algebra/Order/Group/Ideal.lean	3	24	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'staroperator']	nobody	1-38982 1 day ago	1-53437 1 day ago	2-74295 2 days
31273	euprunin author:euprunin	chore(MeasureTheory/MeasurableSpace): golf `measurableSet_generateFrom_singleton_iff` using `grind`	--- Show trace profiling of `measurableSet_generateFrom_singleton_iff`: 70 ms before, 91 ms after ### Trace profiling of `measurableSet_generateFrom_singleton_iff` before PR 31273 ```diff diff --git a/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean b/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean index baf5299a16..fb8e3fc16d 100644 --- a/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean +++ b/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean @@ -42,6 +42,7 @@ end MeasurableSpace namespace MeasureTheory +set_option trace.profiler true in theorem measurableSet_generateFrom_singleton_iff {s t : Set α} : MeasurableSet[MeasurableSpace.generateFrom {s}] t ↔ t = ∅ ∨ t = s ∨ t = sᶜ ∨ t = univ := by simp_rw [MeasurableSpace.generateFrom_singleton] ``` ``` ℹ [880/880] Built Mathlib.MeasureTheory.MeasurableSpace.MeasurablyGenerated (1.2s) info: Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean:46:0: [Elab.async] [0.071352] elaborating proof of MeasureTheory.measurableSet_generateFrom_singleton_iff [Elab.definition.value] [0.069878] MeasureTheory.measurableSet_generateFrom_singleton_iff [Elab.step] [0.068734] simp_rw [MeasurableSpace.generateFrom_singleton] unfold MeasurableSet MeasurableSpace.MeasurableSet' MeasurableSpace.comap simp_rw [MeasurableSpace.measurableSet_top, true_and] constructor · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · refine Or.inr <\| Or.inr <\| Or.inr <\| subset_antisymm (subset_univ _) ?_ suffices x = univ by simp only [this, preimage_univ, subset_refl] refine subset_antisymm (subset_univ _) ?_ rw [univ_eq_true_false] rintro - (rfl \| rfl) · assumption · assumption · have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] · by_cases hF : False ∈ x · have hx : x = { False } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ grind refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ simp [hx, compl_def] · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ suffices x ⊆ ∅ by rw [subset_empty_iff] at this simp only [this, preimage_empty, subset_refl] intro p hp fin_cases p · contradiction · contradiction · rintro (rfl \| rfl \| rfl \| rfl) on_goal 1 => use ∅ on_goal 2 => use { True } on_goal 3 => use { False } on_goal 4 => use Set.univ all_goals simp [compl_def] [Elab.step] [0.068727] simp_rw [MeasurableSpace.generateFrom_singleton] unfold MeasurableSet MeasurableSpace.MeasurableSet' MeasurableSpace.comap simp_rw [MeasurableSpace.measurableSet_top, true_and] constructor · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · refine Or.inr <\| Or.inr <\| Or.inr <\| subset_antisymm (subset_univ _) ?_ suffices x = univ by simp only [this, preimage_univ, subset_refl] refine subset_antisymm (subset_univ _) ?_ rw [univ_eq_true_false] rintro - (rfl \| rfl) · assumption · assumption · have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] · by_cases hF : False ∈ x · have hx : x = { False } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ grind refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ simp [hx, compl_def] · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ suffices x ⊆ ∅ by rw [subset_empty_iff] at this simp only [this, preimage_empty, subset_refl] intro p hp fin_cases p · contradiction · contradiction · rintro (rfl \| rfl \| rfl \| rfl) on_goal 1 => use ∅ on_goal 2 => use { True } on_goal 3 => use { False } on_goal 4 => use Set.univ all_goals simp [compl_def] [Elab.step] [0.012541] simp_rw [MeasurableSpace.generateFrom_singleton] [Elab.step] [0.041180] · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · refine Or.inr <\| Or.inr <\| Or.inr <\| subset_antisymm (subset_univ _) ?_ suffices x = univ by simp only [this, preimage_univ, subset_refl] refine subset_antisymm (subset_univ _) ?_ rw [univ_eq_true_false] rintro - (rfl \| rfl) · assumption [… 112 lines omitted …] · assumption · assumption · have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] [Elab.step] [0.028797] by_cases hF : False ∈ x · refine Or.inr <\| Or.inr <\| Or.inr <\| subset_antisymm (subset_univ _) ?_ suffices x = univ by simp only [this, preimage_univ, subset_refl] refine subset_antisymm (subset_univ _) ?_ rw [univ_eq_true_false] rintro - (rfl \| rfl) · assumption · assumption · have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] [Elab.step] [0.025079] · have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] [Elab.step] [0.025059] have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] [Elab.step] [0.025057] have hx : x = { True } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ by_contra hpneg rw [eq_iff_iff, iff_true, ← false_iff] at hpneg exact hF (by convert hp) simp [hx] [Elab.step] [0.015096] simp [hx] [Meta.synthInstance] [0.011997] ❌️ Nontrivial (Set α) [Elab.step] [0.011467] · by_cases hF : False ∈ x · have hx : x = { False } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ grind refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ simp [hx, compl_def] · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ suffices x ⊆ ∅ by rw [subset_empty_iff] at this simp only [this, preimage_empty, subset_refl] intro p hp fin_cases p · contradiction · contradiction [Elab.step] [0.011367] by_cases hF : False ∈ x · have hx : x = { False } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ grind refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ simp [hx, compl_def] · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ suffices x ⊆ ∅ by rw [subset_empty_iff] at this simp only [this, preimage_empty, subset_refl] intro p hp fin_cases p · contradiction · contradiction [Elab.step] [0.011363] by_cases hF : False ∈ x · have hx : x = { False } := by ext p refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ grind refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ simp [hx, compl_def] · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ suffices x ⊆ ∅ by rw [subset_empty_iff] at this simp only [this, preimage_empty, subset_refl] intro p hp fin_cases p · contradiction · contradiction Build completed successfully (880 jobs). ``` ### Trace profiling of `measurableSet_generateFrom_singleton_iff` after PR 31273 ```diff diff --git a/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean b/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean index baf5299a16..b67f37d372 100644 --- a/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean +++ b/Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean @@ -42,6 +42,7 @@ end MeasurableSpace namespace MeasureTheory +set_option trace.profiler true in theorem measurableSet_generateFrom_singleton_iff {s t : Set α} : MeasurableSet[MeasurableSpace.generateFrom {s}] t ↔ t = ∅ ∨ t = s ∨ t = sᶜ ∨ t = univ := by simp_rw [MeasurableSpace.generateFrom_singleton] @@ -51,35 +52,14 @@ theorem measurableSet_generateFrom_singleton_iff {s t : Set α} : · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x - · refine Or.inr <\| Or.inr <\| Or.inr <\| subset_antisymm (subset_univ _) ?_ - suffices x = univ by simp only [this, preimage_univ, subset_refl] - refine subset_antisymm (subset_univ _) ?_ - rw [univ_eq_true_false] - rintro - (rfl \| rfl) - · assumption - · assumption - · have hx : x = {True} := by - ext p - refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hT⟩ - by_contra hpneg - rw [eq_iff_iff, iff_true, ← false_iff] at hpneg - exact hF (by convert hp) - simp [hx] + · suffices x = univ by grind + grind [univ_eq_true_false] + · grind · by_cases hF : False ∈ x - · have hx : x = {False} := by - ext p - refine ⟨fun hp ↦ mem_singleton_iff.2 ?_, fun hp ↦ hp ▸ hF⟩ - grind - refine Or.inr <\| Or.inr <\| Or.inl <\| ?_ - simp [hx, compl_def] - · refine Or.inl <\| subset_antisymm ?_ <\| empty_subset _ - suffices x ⊆ ∅ by - rw [subset_empty_iff] at this - simp only [this, preimage_empty, subset_refl] + · grind + · suffices x ⊆ ∅ by grind intro p hp - fin_cases p - · contradiction - · contradiction + fin_cases p <;> contradiction · rintro (rfl \| rfl \| rfl \| rfl) on_goal 1 => use ∅ on_goal 2 => use {True} ``` ``` ℹ [880/880] Built Mathlib.MeasureTheory.MeasurableSpace.MeasurablyGenerated (1.2s) info: Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean:46:0: [Elab.async] [0.092756] elaborating proof of MeasureTheory.measurableSet_generateFrom_singleton_iff [Elab.definition.value] [0.091377] MeasureTheory.measurableSet_generateFrom_singleton_iff [Elab.step] [0.090497] simp_rw [MeasurableSpace.generateFrom_singleton] unfold MeasurableSet MeasurableSpace.MeasurableSet' MeasurableSpace.comap simp_rw [MeasurableSpace.measurableSet_top, true_and] constructor · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction · rintro (rfl \| rfl \| rfl \| rfl) on_goal 1 => use ∅ on_goal 2 => use { True } on_goal 3 => use { False } on_goal 4 => use Set.univ all_goals simp [compl_def] [Elab.step] [0.090489] simp_rw [MeasurableSpace.generateFrom_singleton] unfold MeasurableSet MeasurableSpace.MeasurableSet' MeasurableSpace.comap simp_rw [MeasurableSpace.measurableSet_top, true_and] constructor · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction · rintro (rfl \| rfl \| rfl \| rfl) on_goal 1 => use ∅ on_goal 2 => use { True } on_goal 3 => use { False } on_goal 4 => use Set.univ all_goals simp [compl_def] [Elab.step] [0.012749] simp_rw [MeasurableSpace.generateFrom_singleton] [Elab.step] [0.062153] · rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.062134] rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.062131] rintro ⟨x, rfl⟩ by_cases hT : True ∈ x · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.031421] · by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind [Elab.step] [0.031410] by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind [Elab.step] [0.031407] by_cases hF : False ∈ x · suffices x = univ by grind grind [univ_eq_true_false] · grind [Elab.step] [0.019456] · suffices x = univ by grind grind [univ_eq_true_false] [Elab.step] [0.019448] suffices x = univ by grind grind [univ_eq_true_false] [Elab.step] [0.019444] suffices x = univ by grind grind [univ_eq_true_false] [Elab.step] [0.010344] grind [univ_eq_true_false] [Elab.step] [0.011419] · grind [Elab.step] [0.011411] grind [Elab.step] [0.011407] grind [Elab.step] [0.011402] grind [Elab.step] [0.029820] · by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.029812] by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.029808] by_cases hF : False ∈ x · grind · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.011217] · grind [Elab.step] [0.011211] grind [Elab.step] [0.011208] grind [Elab.step] [0.011203] grind [Elab.step] [0.017927] · suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.017920] suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.017914] suffices x ⊆ ∅ by grind intro p hp fin_cases p <;> contradiction [Elab.step] [0.014460] suffices x ⊆ ∅ by grind [Elab.step] [0.014455] refine_lift suffices x ⊆ ∅ by grind; ?_ [Elab.step] [0.014451] focus (refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right) [Elab.step] [0.014447] (refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right) [Elab.step] [0.014445] (refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right) [Elab.step] [0.014442] (refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right) [Elab.step] [0.014440] refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right [Elab.step] [0.014438] refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_); rotate_right [Elab.step] [0.014428] refine no_implicit_lambda% (suffices x ⊆ ∅ by grind; ?_) [Elab.step] [0.013889] grind [Elab.step] [0.013885] grind [Elab.step] [0.013879] grind Build completed successfully (880 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	6/27	Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean	1	3	['EtienneC30', 'github-actions']	EtienneC30 assignee:EtienneC30	1-37550 1 day ago	1-37550 1 day ago	8-78992 8 days
31398	YaelDillies author:YaelDillies	feat(MeasureTheory/Measure): `comap_apply` version for measurable equivs	This one is stated in terms of the preimage of the inverse, which is sometimes (but not always!) more useful than the image of the forward map. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	13/0	Mathlib/MeasureTheory/Measure/Restrict.lean	1	4	['EtienneC30', 'YaelDillies', 'github-actions']	EtienneC30 assignee:EtienneC30	1-36395 1 day ago	1-36420 1 day ago	5-29604 5 days
31558	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Topology/Sublevel): sublevels and overlevels, relation with semicontinuity	Define sublevels and overlevels of a function, in various sorts (`LE` or LT`, relative to a set). Relation with semicontinuity. `Set.inter_leSublevelOn_empty_iff_exists_finset_inter`, an intersection of sublevels of a lower semicontinuous function on a compact set is empty if and only if a finite sub-intersection is already empty. Co-authored with @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	399/0	Mathlib.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Sublevel.lean	3	1	['github-actions']	nobody	1-36181 1 day ago	1-53265 1 day ago	1-53299 1 day
31551	RemyDegenne author:RemyDegenne	feat: `gaussianReal_const_sub`	- Add lemmas stating that if `X` is a real Gaussian random variable with mean `μ` and variance `v`, then `-X`, `X - y` and `y - X` are Gaussian with variance `v` and respective means `-μ`, `μ - y` and `y - μ`. - Generalize this section of the file from `MeasureSpace` to `MeasurableSpace`+`Measure` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	30/13	Mathlib/Probability/Distributions/Gaussian/Real.lean	1	2	['EtienneC30', 'github-actions']	EtienneC30 assignee:EtienneC30	1-35344 1 day ago	1-35351 1 day ago	0-26616 7 hours
30989	kckennylau author:kckennylau	feat(RingTheory): Teichmuller map	Let `R` be an `I`-adically complete ring, and `p` be a prime number with `p ∈ I`. This PR constructs the Teichmüller map `Perfection (R ⧸ I) p →₀ R` such that it composed with the quotient map `R →+ R ⧸ I` is the "0-th coefficient" map `Perfection (R ⧸ I) p →+* R ⧸ I`. This generalises the existing [PreTilt.untilt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Perfectoid/Untilt.html#PreTilt.untilt). I have also moved `Mathlib/LinearAlgebra/SModEq` to a folder to be `/SModEq/Basic.lean`, because I needed to add some lemmas to `/SModEq/Prime.lean`; I also added a lemma to the end of `/Basic.lean` called `ideal`. --- In order to try to artificially minimise the diff count, I have made #30990 which only moves the file `SModEq`. - [x] depends on: #30990 - [x] depends on: #31193 - [x] depends on: #31195 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		206/112	Mathlib.lean,Mathlib/LinearAlgebra/SModEq/Basic.lean,Mathlib/LinearAlgebra/SModEq/Prime.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/Teichmuller.lean	6	24	['erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	1-33804 1 day ago	1-33822 1 day ago	11-10894 11 days
30995	kckennylau author:kckennylau	feat(RingTheory): adic limit	For an `I`-adically complete `M` we define `limit : AdicCompletion I M ≃ₗ[R] M`. This 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	84/0	Mathlib.lean,Mathlib/RingTheory/AdicCompletion/Limit.lean	2	3	['erdOne', 'github-actions', 'jjdishere', 'kckennylau']	erdOne assignee:erdOne	1-33675 1 day ago	5-69697 5 days ago	11-7995 11 days
30833	kckennylau author:kckennylau	feat(Data): IsScalarTower for ZMod	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	28/0	Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Data/ZMod/Basic.lean	2	10	['erdOne', 'github-actions', 'kckennylau', 'leanprover-bot', 'robin-carlier']	robin-carlier assignee:robin-carlier	1-33606 1 day ago	9-62654 9 days ago	11-65110 11 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	553/181	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	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	1-33551 1 day ago	1-33574 1 day ago	18-18203 18 days
31007	kckennylau author:kckennylau	feat(RingTheory): generalise perfection to monoids	1. We generalise `PerfectRing` to monoids (without changing the name). 2. We move `Submonoid.perfection` and `Ring.Perfection` to the already existing `Perfection` namespace, which solves the problem that `Ring.Perfection` and its lemmas `Perfection.xxx` are in different namespaces. Also, the monoid perfection and right perfection have the same underlying set, so this unify the two approaches. 3. `Perfection.lift` is now generalised to monoids: `liftMonoidHom : (M →* N) ≃ (M →* Perfection N p)` where `M` is a perfect monoid. --- This is in preparation for a future PR following #30989. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		247/123	Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean	4	32	['github-actions', 'jjdishere', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	1-33419 1 day ago	1-33440 1 day ago	11-25233 11 days
28013	astrainfinita author:astrainfinita	feat: Lindemann-Weierstrass Theorem	This PR continues the work from #6718. -------- - [x] depends on: #18693 - [ ] depends on: #29121	t-algebra t-analysis label:t-algebra$	1141/54	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Data/Finsupp/Defs.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	11	n/a	['astrainfinita', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-32546 1 day ago	unknown	unknown
31121	jessealama author:jessealama	feat: add ComplexShape.EulerCharSigns for generalized Euler characteristic	Add `ComplexShape.EulerCharSigns` typeclass providing the alternating signs `χ : ι → ℤˣ` for Euler characteristic computations. Instances are provided for `up ℕ`, `down ℕ`, `up ℤ`, and `down ℤ`. The Euler characteristic definitions (`eulerChar` and `eulerCharTsum`) are defined on `GradedObject` with `ComplexShape` as an explicit parameter. The `HomologicalComplex` versions are abbreviations that apply these to `C.X` and `C.homology`. Both finite and infinite sum versions are provided. Split from #29713 as suggested by @joelriou.	t-algebra t-category-theory awaiting-author label:t-algebra$	184/0	Mathlib.lean,Mathlib/Algebra/Homology/EulerCharacteristic.lean	2	3	['github-actions', 'jessealama', 'joelriou']	nobody	1-32245 1 day ago	1-52817 1 day ago	12-18361 12 days
31562	MichaelStollBayreuth author:MichaelStollBayreuth	chore: clean up imports	This PR removes unnecessary imports from a number of files. The method is not very systematic: prompted by a PR I was reviewing that had a few unnecessary imports (not noticed by `#min_imports`), I was looking through Mathlib for these imports and tried to remove them (and possibly further imports in the files I was looking at). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		3/94	Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2019Q4.lean,Counterexamples/Phillips.lean,Counterexamples/SorgenfreyLine.lean,Mathlib/Algebra/IsPrimePow.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Range.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Data/Int/NatPrime.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Nat/Prime/Int.lean,Mathlib/Data/Num/Prime.lean,Mathlib/Data/ZMod/Coprime.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/LinearAlgebra/AnnihilatingPolynomial.lean,Mathlib/LinearAlgebra/CrossProduct.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/Logic/Godel/GodelBetaFunction.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/ModelTheory/Algebra/Field/IsAlgClosed.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/NumberTheory/Real/GoldenRatio.lean,Mathlib/NumberTheory/Real/Irrational.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/DualNumber.lean,Mathlib/RingTheory/EuclideanDomain.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Ideal/NatInt.lean,Mathlib/RingTheory/Int/Basic.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Polynomial/Dickson.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/Radical.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean,Mathlib/Topology/Algebra/InfiniteSum/ConditionalInt.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/ContinuousMap/ContinuousSqrt.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	57	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	1-31131 1 day ago	1-31131 1 day ago	1-35890 1 day
31278	ADedecker author:ADedecker	feat: approximate continuous functions by smooth functions	This is motivated by #31079, and adapted from [this lemma](https://github.com/leanprover-community/sphere-eversion/blob/master/SphereEversion/ToMathlib/ExistsOfConvex.lean#L213) in the Sphere Eversion project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-analysis t-differential-geometry	157/0	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Const.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/SmoothApprox.lean	7	36	['ADedecker', 'github-actions', 'grunweg', 'mcdoll', 'sgouezel']	grunweg assignee:grunweg	1-31056 1 day ago	7-55644 7 days ago	8-44606 8 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/)	t-ring-theory	221/0	Mathlib.lean,Mathlib/RingTheory/LocalRing/SeparableResidueField.lean	2	1	['github-actions']	nobody	1-30021 1 day ago	1-30033 1 day ago	1-30068 1 day
31570	tb65536 author:tb65536	feat(GroupTheory/Perm/ClosureSwap): add slight generalization	This PR adds a slight generalization of `surjective_of_isSwap_of_isPretransitive` that is needed to compute the Galois group of `x^n - x - 1`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory	15/5	Mathlib/GroupTheory/Perm/ClosureSwap.lean	1	1	['github-actions']	nobody	1-29789 1 day ago	1-29789 1 day ago	1-29764 1 day
31573	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph): split `Walk.lean` into 4 files	Split into 4 files in a new `Walks` subfolder: - `Basic.lean`: basic definitions and theorems about them, without modifying the walks: `Walk`, `Nil`, `length`, `getVert`, `support`, `darts`, `edges`, `edgeSet`, `snd`, `penultimate`, `firstDart`, `lastDart` - `Operations.lean`: similar to the existing `WalkDecomp.lean`, this file defines operations on walks: `copy`, `append`, `concat`, `reverse`, `drop`, `take`, `tail`, `dropLast`. The name of the file matches `SimpleGraph/Operations.lean` which defines operations on graphs. - `Maps.lean`: operations that map the walk to another graph: `map`, `mapLe`, `transfer`, `induce`, `toDeleteEdges`, `toDeleteEdge`. The name of the file matches `SimpleGraph/Maps.lean` which defines maps on graphs. - `Subwalks.lean`: the definition of `IsSubwalk` and theorems about it Deprecates the original `Walk.lean` module. --- `Walk.lean` has been [around 1500 lines](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/long.20files/near/554617597) for a while, so this PR splits it into 4 files. Fixes [this TODO](https://github.com/leanprover-community/mathlib4/blob/4055dfea0311fa984f3b4eaa629c12220ff0a03a/Mathlib/Combinatorics/SimpleGraph/Walk.lean#L36). What changed: I haven't changed any of the declarations, nor their relative order, just partitioned the contents of the original module. But I did modify `namespace`/`end`/`variable`/`universe`/`open` commands, while attempting to not cause modifications to variable names/order/binder-info (can the bot verify that or does it only check name changes?). Also I modified the module docstrings to include the definitions in each file, and a few heading comments (comments that begin with pound symbols). I'll move the existing `Paths.lean` and `WalkDecomp.lean` to `Walks/` in a later PR, perhaps with a rename as well. If it helps I can try to split this into 4 commits (or 4 separate PRs) doing the following in-order: - move `Walk.lean` to `Walks/Basic.lean` - split off a chunk to a new `Subwalks.lean` - split off a chunk to a new `Maps.lean` - split off a chunk to a new `Operations.lean` I'm planning to PR a few more definitions to `Basic` soon, namely `nextDart`/`prevDart`/`containingEdge`, so if you prefer we can split `getVert`/`snd`/`penultimate`/`firstDart`/`lastDart` now to a new `Navigation.lean`, or keep it in `Basic`. I think this split is pretty good, though it's worth noting 9 theorems are in `Operations` and not `Basic` because their proof relies on operations even though their statement doesn't: - `support_eq_concat` - `dart_snd_mem_support_of_mem_darts` - `fst_mem_support_of_mem_edges` - `snd_mem_support_of_mem_edges` - `edges_nodup_of_support_nodup` - `ext_support` - `support_injective` - `ext_getVert_le_length` - `ext_getVert` Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Splitting.20.60Walk.2Elean.60/ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	1593/1494	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Maps.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Walks/Subwalks.lean	8	1	['github-actions']	nobody	1-26889 1 day ago	1-28228 1 day ago	1-28265 1 day
31572	tb65536 author:tb65536	feat(Algebra/Group/Subgroup/Basic): API lemma relating `inertia` and `subgroupOf`	This PR adds an API lemma relating `inertia` and `subgroupOf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory t-algebra label:t-algebra$	5/0	Mathlib/Algebra/Group/Subgroup/Basic.lean	1	1	['github-actions']	nobody	1-26855 1 day ago	1-26855 1 day ago	1-26830 1 day
30650	JovanGerb author:JovanGerb	perf(reassoc, to_app, elementwise): don't pass the same proof to the kernel again	In `reassoc`, `to_app`, `elementwise`, the proof of the original lemma was being used to prove the modified lemma. This is silly, because the modified lemma can be proved using the original lemma directly. Hence, this PR modifies `addRelatedDecl` to include this optimization. Previously, `addRelatedDecl` would pass around both the type and the value of the original declaration. This was necessary, because the inferred type of the value might not be identical to the type it is given. Now this is not necessary anymore, because the type of the constant is exactly the type that it is given, so the type can always be obtained with `inferType`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	19/21	Mathlib/Tactic/CategoryTheory/Elementwise.lean,Mathlib/Tactic/CategoryTheory/Reassoc.lean,Mathlib/Tactic/CategoryTheory/ToApp.lean,Mathlib/Util/AddRelatedDecl.lean	4	13	['JovanGerb', 'dwrensha', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127']	dwrensha assignee:dwrensha	1-23351 1 day ago	1-64867 1 day ago	26-54166 26 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-measure-probability t-meta	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	23	['YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	RemyDegenne assignee:RemyDegenne	1-21703 1 day ago	8-55193 8 days ago	8-55148 8 days
30213	SnirBroshi author:SnirBroshi	feat(Data/List/GetD): golf and add lemmas for `get` and `getElem?`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	18/16	Mathlib/Data/List/GetD.lean	1	11	['SnirBroshi', 'eric-wieser', 'github-actions', 'themathqueen']	pechersky assignee:pechersky	1-21700 1 day ago	18-20459 18 days ago	39-73891 39 days
30706	astrainfinita author:astrainfinita	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This PR builds upon #8370 and avoids `Algebra ℚ` typeclass assumptions wherever possible. Many `[NormedAlgebra ℚ 𝔸]` can be generalized to `[NontriviallyNormedField 𝕂] [CharZero 𝕂] [ContinuousSMul ℚ 𝕂] [NormedAlgebra 𝕂 𝔸]`, which basically means allowing `ℚ` to use other equivalent norms, and may not be the case of concern. It might be possible to use some Prop-valued typeclasses to avoid the diamond problem potentially caused by `[NormedAlgebra ℚ 𝔸]`. This makes it unnecessary to manually obtain `[NormedAlgebra ℚ 𝔸]` when we have `[NormedAlgebra ℝ 𝔸]` or `[NormedAlgebra ℂ 𝔸]`. Co-authored-by: Eric Wieser --- - [ ] depends on: #28475 There are still some documentation comments that need to be updated. Zulip: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	477/444	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Connected.lean,Mathlib/Analysis/Normed/Algebra/DualNumber.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Real/Hyperreal.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Analysis/SpecificLimits/RCLike.lean,Mathlib/Combinatorics/Derangements/Exponential.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Fernique.lean,Mathlib/Probability/Distributions/Poisson.lean	22	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-21699 1 day ago	15-18263 15 days ago	0-996 16 minutes
30684	YaelDillies author:YaelDillies	chore: deprecate `monoidalOfHasFiniteProducts`	Over the summer, this was replaced everywhere with `CartesianMonoidalCategory.ofHasFiniteProducts`, but hadn't been deprecated. --- I would personally be very happy to also delete the finite coproduct stuff, but we don't yet have cocartesian-monoidal categories to replace them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	92/92	Mathlib/CategoryTheory/Monoidal/OfHasFiniteProducts.lean	1	20	['YaelDillies', 'dagurtomas', 'github-actions', 'joelriou', 'kckennylau']	thorimur assignee:thorimur	1-21699 1 day ago	7-80114 7 days ago	23-62835 23 days
30814	yuanyi-350 author:yuanyi-350	feat(LinearAlgebra/Dimension/RankDecomposition): Rank decomposition and bases adapted to a linear map	For any matrix A (not necessarily square), there exists a rank normal form. That is, there exist invertible matrices P and Q such that $$ A = P \cdot \left( \begin{array}{cc} I_r & 0 \\ 0 & 0 \end{array} \right) Q $$ Abstractly speaking, any linear map can be decomposed as an invertible map composed with a projection map composed with an invertible map. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	97/0	Mathlib.lean,Mathlib/LinearAlgebra/Dimension/RankDecomposition.lean	2	20	['PatrickMassot', 'github-actions', 'kckennylau', 'ocfnash', 'plp127', 'yuanyi-350']	dagurtomas assignee:dagurtomas	1-21698 1 day ago	5-22486 5 days ago	6-16528 6 days
30851	FormulaRabbit81 author:FormulaRabbit81	feat(Topology): prove there exists an embedding of separable metric spaces in the hilbert cube	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #30849	file-removed	140/42	Mathlib.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/MetricSpace/PiNat.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	1-21697 1 day ago	9-28761 9 days ago	9-49515 9 days
30857	erdOne author:erdOne	feat(RingTheory): miscellaneous lemmas about etale	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	64/11	Mathlib/AlgebraicGeometry/Morphisms/FormallyUnramified.lean,Mathlib/RingTheory/Etale/Basic.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Unramified/Basic.lean,Mathlib/RingTheory/Unramified/Field.lean,Mathlib/RingTheory/Unramified/LocalRing.lean,Mathlib/RingTheory/Unramified/Locus.lean	8	6	['chrisflav', 'erdOne', 'github-actions']	mariainesdff assignee:mariainesdff	1-21696 1 day ago	7-35494 7 days ago	10-68392 10 days
30983	erdOne author:erdOne	feat(RingTheory): results on resultant	Also changed the definition of `sylvesterMatrix` because the old definition has the wrong sign. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	303/33	Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/RingTheory/Polynomial/Resultant/Basic.lean,Mathlib/RingTheory/WittVector/MulCoeff.lean	5	6	['erdOne', 'eric-wieser', 'github-actions', 'kckennylau']	chrisflav assignee:chrisflav	1-21694 1 day ago	6-30640 6 days ago	17-35738 17 days
31264	plp127 author:plp127	feat(Filter): replace coframe instance with better defeqs	Replace the `Filter.instCoframe` with explicitly given operations. Prove `Filter.mem_sdiff` and `Filter.hnot_def`. The definitions I chose here are somewhat arbitrary, but I think they're better than what we had before. I chose these specific definitions based on a conversation with AI, but I did not use AI to help me write this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	34/22	Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean	5	2	['github-actions', 'plp127']	Vierkantor assignee:Vierkantor	1-21693 1 day ago	9-56100 9 days ago	9-56086 9 days
31265	joelriou author:joelriou	feat(AlgebraicTopology): Edge and CompStruct for simplicial sets	The API for `2`-truncated simplicial sets #31254 is reproduced for simplicial sets. The definitions for simplicial sets are defeq to their `2`-truncated counterparts, but an effort is made to contain abuse of defeq... --- - [x] depends on: #31254 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	187/1	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	robin-carlier assignee:robin-carlier	1-21692 1 day ago	5-21084 5 days ago	5-21059 5 days
31293	erdOne author:erdOne	feat(Algebra/InfiniteSum): `HasProdUniformly` and friends	Also refactors `HasProdUniformlyOn` to take one set instead of a family of sets. See https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/SummableUniformlyOn/with/553935898 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology RFC label:t-algebra$	338/101	Mathlib/Analysis/NormedSpace/MultipliableUniformlyOn.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Topology/Algebra/InfiniteSum/TsumUniformlyOn.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	4	1	['github-actions']	jcommelin assignee:jcommelin	1-21691 1 day ago	8-49724 8 days ago	8-49713 8 days
31305	kim-em author:kim-em	feat: grind golfing in Topology/Path	This is not as exhaustive as I would have liked; there's plenty more cleanup to do here. But I need to pause on this for now and I think it's an improvement.		61/91	Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	5	3	['github-actions', 'grunweg']	j-loreaux assignee:j-loreaux	1-21689 1 day ago	8-33148 8 days ago	8-33122 8 days
31324	YaelDillies author:YaelDillies	chore(Finsupp): move `mapRange.equiv` earlier	Move `mapRange.equiv` to `Data.Finsupp.Defs` and `mapRange.addEquiv` to `Algebra.Group.Finsupp`. This lets us not import fields when defining `finsuppAntidiag`. As previously, I am basing myself off the idea that `Finsupp` will at some point in the future be generalised to other base points (rather than just `0` as it is now), and that therefore anything under `Data.Finsupp` should not be algebraic (apart from mentioning `0`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	103/151	Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean	6	1	['github-actions', 'wwylele']	ocfnash assignee:ocfnash	1-21688 1 day ago	7-67866 7 days ago	7-67856 7 days
31337	chrisflav author:chrisflav	feat(CategoryTheory): add predicate `IsRepresentedBy`	We define the predicate `IsRepresentedBy`: A functor `F` is represented by `X` with universal element `x : F.obj X` if the natural transformation `yoneda.obj X ⟶ F` induced by `x` is an isomorphism. We also relate this to the other existing ways of expressing a functor is representable. This is part of a series towards expressing a certain morphism is an analytification morphism, which will be defined in terms of `IsRepresentedBy`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	236/0	Mathlib.lean,Mathlib/CategoryTheory/RepresentedBy.lean,Mathlib/CategoryTheory/Yoneda.lean	3	2	['erdOne', 'github-actions']	robin-carlier assignee:robin-carlier	1-21688 1 day ago	7-24206 7 days ago	7-24181 7 days
31342	kim-em author:kim-em	feat: `extract_goal` preserves explicit foralls		t-meta	36/5	Mathlib/Tactic/ExtractGoal.lean,Mathlib/Tactic/TacticAnalysis/Declarations.lean,MathlibTest/ExtractGoal.lean	3	1	['github-actions']	robertylewis assignee:robertylewis	1-21686 1 day ago	7-13006 7 days ago	7-13042 7 days
31360	erdOne author:erdOne	feat(RingTheory): coeffs of a poly is integral if it divides an integral poly	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory	62/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/IsIntegral.lean	2	3	['SnirBroshi', 'erdOne', 'github-actions']	chrisflav assignee:chrisflav	1-21685 1 day ago	6-62659 6 days ago	6-62693 6 days
31374	euprunin author:euprunin	chore: use `order` instead of `aesop` to make the intent clearer	--- Separated from the non-`aesop` cases for benchmarking reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		5/4	Mathlib/Analysis/Meromorphic/TrailingCoefficient.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean	3	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	adamtopaz assignee:adamtopaz	1-21684 1 day ago	5-80948 5 days ago	5-83787 5 days
31377	CoolRmal author:CoolRmal	feat: a series of smooth functions that converges (locally) uniformly is smooth	The main theorem proved in this lemma is that: if a sequence of functions `fₙ` is such that for each `0 ≤ k ≤ N`, the series of `k`-th iterated derivatives `∑ (iteratedDerivWithin k fₙ s) (z)` is summable (locally) uniformly on a set`s`, and each `fₙ` is in the class of `C^N`, then the series is also in `C^N`. This is an analogue of the existing theorem [contDiff_tsum](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Calculus/SmoothSeries.html#contDiff_tsum). My 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). Several Remarks: 1. The proof of `SummableUniformlyOn.continuousOn_tsum` (and other similar theorems) actually does not require the assumption that the codomain is a `T2Space` (see #31313). 2. The author of the file [Mathlib/Topology/Algebra/InfiniteSum/TsumUniformlyOn.lean](https://github.com/leanprover-community/mathlib4/compare/master...CoolRmal:mathlib4:contDiffwithinTsum?expand=1#diff-8b2f878190f47dd6544467469c58d2cdf59d6f79277b21814cdef554a27a4fd7) assumes that the set `s` is open and uses `derivWithin` in the statements. I follow the same convention right now, but I really think it is better to use `deriv` because we have [derivWithin_of_isOpen](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Calculus/Deriv/Basic.html#derivWithin_of_isOpen) and `derivWithin` makes things more complicated. 3. I also doubt that some of the theorems I proved still hold if `s` is only assumed to has the [UniqueDiffOn](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Analysis/Calculus/TangentCone.html#UniqueDiffOn) property. If there is an easy way to generalize this theorem to sets that are not necessarily open, then the second comment can be ignored. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	249/23	Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/Topology/Algebra/InfiniteSum/TsumUniformlyOn.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	4	1	['github-actions']	ocfnash assignee:ocfnash	1-21683 1 day ago	5-75725 5 days ago	5-75764 5 days
31385	harahu author:harahu	doc(MathlibTest): demote repeated H1 headers to H2	This PR demotes H1 headers beyond the first per file to H2. Having only a single H1 header per file is considered good practice when writing markdown. The mathlib documentation style guide does not explicitly state that a module docstring should only contain a single H1, but this seems to be taken for granted, since only the file header is requested to be an H1, while any other header mentioned is asked to be either H2 or H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		2/2	MathlibTest/norm_num.lean	1	1	['github-actions']	dupuisf assignee:dupuisf	1-21683 1 day ago	5-49162 5 days ago	5-49136 5 days
31421	joelriou author:joelriou	feat(CategoryTheory): HasCardinalLT for MorphismProperty and ObjectProperty	This PR introduces abbreviations to say that the type of objects or morphisms satisfying a certain property is of cardinality `<κ`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	123/0	Mathlib.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/HasCardinalLT.lean,Mathlib/CategoryTheory/ObjectProperty/HasCardinalLT.lean	4	1	['github-actions']	TwoFX assignee:TwoFX	1-21679 1 day ago	4-71059 4 days ago	4-71035 4 days
31428	harahu author:harahu	doc(AlgebraicTopology/SingularSet): fix typos	This PR fixes some apparent typos in `SingularSet`. The typos were found and corrected with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	7/7	Mathlib/AlgebraicTopology/SingularSet.lean	1	2	['github-actions', 'harahu']	robin-carlier assignee:robin-carlier	1-21678 1 day ago	4-66598 4 days ago	4-66991 4 days
31424	joelriou author:joelriou	feat(CategoryTheory): description of the type WalkingMultispan	Given `J : MultispanShape`, we introduce bijections `WalkingMultispan J ≃ J.L ⊕ J.R` and `Arrow (WalkingMultispan J) ≃ WalkingMultispan J ⊕ J.L ⊕ J.L`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	25/0	Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean	1	1	['github-actions']	riccardobrasca assignee:riccardobrasca	1-21678 1 day ago	4-70721 4 days ago	4-70696 4 days
31441	harahu author:harahu	doc(Dynamics): polish docstrings	This PR fixes a batch of typos in `Dynamics`. The typos were found and fixed with the help of Codex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics	11/12	Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Dynamics/Ergodic/Action/OfMinimal.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean	3	2	['github-actions', 'harahu']	sgouezel assignee:sgouezel	1-21677 1 day ago	4-47561 4 days ago	4-47598 4 days
31446	harahu author:harahu	doc(MeasureTheory/Measure/Regular): polish docstrings	The issues were found and fixed by Codex. The fixes are mainly just typo fixes, but there are three substantive changes that warrant careful review: - "compacts closed sets" -> "compact sets" in the definition of a regular measure. - The addition of "of finite measure" in the definition of a measure that is `InnerRegularCompactLTTop`. - Changes to the docstring of `_root_.IsOpen.measure_eq_iSup_isClosed` As far as I can tell, all of these changes are justified, but I am not an expert, so it would be helpful to have another critical pair of eyes look over them. The PR also drops backticks around σ in a number of places. This is because σ-compact, σ-finite and σ-algebra are all established mathematical terminology. Having backticks mid-word just makes it harder to search for these terms in the code base. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	28/27	Mathlib/MeasureTheory/Measure/Regular.lean	1	1	['github-actions']	RemyDegenne assignee:RemyDegenne	1-21676 1 day ago	4-33307 4 days ago	4-33345 4 days
31449	kim-em author:kim-em	feat(SemilocallySimplyConnected): definition and alternative formulation			112/0	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/Topology/Path.lean	3	2	['ADedecker', 'github-actions']	jcommelin assignee:jcommelin	1-21675 1 day ago	4-28332 4 days ago	4-28306 4 days
31535	ADedecker author:ADedecker	feat: small tweaks to `PointwiseConvergenceCLM`	These are small suggestions I would have made about #11496: - add a `IsUniformEmbedding` variant of `isEmbedding_coeFn` - add a `ContinuousEvalConst` instance using [UniformConvergenceCLM.continuousEvalConst](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Algebra/Module/StrongTopology.html#UniformConvergenceCLM.continuousEvalConst) - use said instance to golf continuity in `evalCLM` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	16/11	Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean	1	3	['github-actions', 'mcdoll']	nobody	1-20952 1 day ago	1-20952 1 day ago	1-76209 1 day
29562	ShreckYe author:ShreckYe	feat(Analysis/SpecialFunctions/Trigonometric): tangent half-angle substitution		t-analysis	58/0	Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean	2	9	['ShreckYe', 'github-actions', 'j-loreaux', 'ocfnash']	ocfnash assignee:ocfnash	1-18958 1 day ago	1-19034 1 day ago	59-3201 59 days
31575	kim-em author:kim-em	chore: reverse the directions of Path.symm_cast and trans_cast	It seems Mathlib doesn't mind currently which way these go, but pushing casts inwards is better for me.	t-topology	11/0	Mathlib/Topology/Path.lean	1	1	['github-actions']	nobody	1-18635 1 day ago	1-18635 1 day ago	1-18681 1 day
29458	LiamSchilling author:LiamSchilling	feat(MvPolynomial/WeightedHomogenous): relate `weightedTotalDegree` to `degrees` and `degreeOf`	`weightedTotalDegree` is the most general notion of multivariate degree in mathlib. These theorems show that it specializes to `degrees` and `degreeOf` with specialized weights. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor awaiting-author	17/0	Mathlib/RingTheory/MvPolynomial/Homogeneous.lean	1	6	['LiamSchilling', 'chrisflav', 'github-actions']	chrisflav assignee:chrisflav	1-17806 1 day ago	51-74747 1 month ago	14-19311 14 days
31114	mcdoll author:mcdoll	feat(Analysis): use new notation for Fourier transform on Schwartz functions and simplify presentation	Use the new notation for the Fourier transform and its inverse to clean up `FourierSchwartz`. - Use notation type class and `Prop`-type classes. - State all lemmas for the Fourier transform on `SchwartzMap` and not on the coercion to functions. - Add coercion lemmas. - Move `FourierTransformCLE` up in the file and use `FourierEquiv` from the abstract notation file. - Use the notation for the Fourier transform and the Schwartz functions in `PoissonSummation`. - Add my name to the authors list for this PR and the PR for Plancherel's theorem. - Some golfing --- - [x] depends on: #31115 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	96/60	Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-13635 1 day ago	1-14719 1 day ago	1-14694 1 day
31525	kim-em author:kim-em	feat: convex combinations in `Set.Icc`	This will hopefully become obsolete with a more general theory of convex spaces, but this would be helpful to go on for now.	t-topology	120/0	Mathlib/Topology/UnitInterval.lean	1	1	['github-actions']	nobody	1-11920 1 day ago	2-26634 2 days ago	2-26668 2 days
31577	mcdoll author:mcdoll	feat(Analysis): the topology of pointwise convergence is locally convex	Show that the pointwise convergence topology is locally convex both in the sense of `WithSeminorms` and `LocallyConvexSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	109/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Data/Set/Finite/Lemmas.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	5	1	['github-actions']	nobody	1-4687 1 day ago	1-4687 1 day ago	1-4663 1 day
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	341/0	Mathlib.lean,Mathlib/Analysis/Calculus/PartialDerivativeTest.lean	2	12	['bjoernkjoshanssen', 'github-actions', 'j-loreaux', 'themathqueen']	nobody	1-3086 1 day ago	126-12840 4 months ago	5-11006 5 days
31557	kex-y author:kex-y	feat: lemmas on the stopped process and stopped value	--- From Brownian motion project [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	54/6	Mathlib/Probability/Process/Stopping.lean	1	13	['EtienneC30', 'github-actions', 'kex-y']	nobody	0-84329 23 hours ago	0-84478 23 hours ago	1-7921 1 day
31408	peakpoint author:peakpoint	feat(Analysis/Calculus/LHopital): L'Hopital's rule from within a convex set	Extracted from #19796 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis	185/20	Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean	4	1	['github-actions']	nobody	0-83036 23 hours ago	0-83038 23 hours ago	5-15407 5 days
31564	EtienneC30 author:EtienneC30	feat: injectivity of the map forgetting the continuity of bilinear maps	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	15/0	Mathlib/Topology/Algebra/Module/StrongTopology.lean	1	2	['github-actions', 'themathqueen']	nobody	0-82390 22 hours ago	1-34556 1 day ago	1-34682 1 day
31566	EtienneC30 author:EtienneC30	feat: when a measure is equal to a `gaussianReal`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	10/0	Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean	2	2	['github-actions', 'themathqueen']	nobody	0-82304 22 hours ago	1-33977 1 day ago	1-34010 1 day
30129	vlad902 author:vlad902	feat(SimpleGraph): define and prove basic theory of vertex covers	Define a predicate `IsVertexCover G C` to state that `C` is a vertex cover of `G`. Furthermore, `G.minVertexCover` is the cardinality of the minimum vertex cover of G. Then prove the basic theory of how these definitions relate to the empty and complete graphs and their relationship with graph homs/isos. --- - [x] depends on: #29833 - [x] depends on: #30136 - [x] depends on: #30137 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	199/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/VertexCover.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	YaelDillies assignee:YaelDillies	0-80553 22 hours ago	9-32296 9 days ago	9-33337 9 days
28693	faenuccio author:faenuccio	feat(Analysis.Normed.Module.Milman-Pettis): add Milman-Pettis theorem	We add the Milman-Pettis theorem stating that an uniformly convex Banach space is reflexive. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	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	5	['faenuccio', 'github-actions', 'grunweg', 'yhx-12243']	nobody	0-79257 22 hours ago	85-63429 2 months ago	0-1 1 second
29997	xroblot author:xroblot	feat(CyclotomicFields): general formula for the discriminant	Add the general formula for the (absolute value of the) discriminant of a cyclotomic field: ```lean theorem natAbs_absdiscr (n : ℕ) [hn : NeZero n] [hK : IsCyclotomicExtension {n} ℚ K] : (discr K).natAbs = (n ^ n.totient / ∏ p ∈ n.primeFactors, p ^ (n.totient / (p - 1))) ``` --- - [x] depends on: #29665 - [x] depends on: #29943	large-import t-number-theory	88/2	Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-78882 21 hours ago	0-79039 21 hours ago	0-81038 22 hours
31581	kebekus author:kebekus	feat: behavior of the counting function under addition	Establish the behavior of the "Proximity Function" of Value Distribution theory with respect to addition. This material is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. The formula established here is part of a larger package discussing the behavior of the Nenvanlinna height under algebraic manipulations of the functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	136/10	Mathlib/Analysis/Complex/ValueDistribution/CountingFunction.lean,Mathlib/Analysis/Meromorphic/Divisor.lean,Mathlib/Analysis/Meromorphic/Order.lean	3	1	['github-actions']	nobody	0-76806 21 hours ago	0-77790 21 hours ago	0-77824 21 hours
31556	kebekus author:kebekus	feat: behavior of the proximity function under addition	Establish the behavior of the "Proximity Function" of Value Distribution theory with respect to addition. This material is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. The formula established here is part of a larger package discussing the behavior of the Nenvanlinna height under algebraic manipulations of the functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	68/0	Mathlib/Analysis/Complex/ValueDistribution/ProximityFunction.lean,Mathlib/MeasureTheory/Integral/CircleAverage.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean	3	1	['github-actions']	nobody	0-76629 21 hours ago	0-76629 21 hours ago	1-57269 1 day
31584	joelriou author:joelriou	chore: move CategoryTheory.ComposableArrows	It is moved to `CategoryTheory.ComposableArrows.Basic` in order to allow new features without making this long file even longer. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory	7/7	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/TransfiniteCompositionOfShape.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/ComposableArrows.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean	8	1	['github-actions']	nobody	0-75685 21 hours ago	0-76246 21 hours ago	0-76288 21 hours
23940	YaelDillies author:YaelDillies	feat: polytopes	From Toric Co-authored-by: Matthew Johnson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-analysis awaiting-author	65/0	Mathlib.lean,Mathlib/Geometry/Convex/Polytope.lean,Mathlib/Geometry/Convex/README.md	3	12	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'ooovi']	j-loreaux assignee:j-loreaux	0-75676 21 hours ago	0-75695 21 hours ago	143-64212 143 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	3/3	Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Const.lean	2	1	['github-actions']	grunweg assignee:grunweg	0-72726 20 hours ago	0-77312 21 hours ago	0-0 0 seconds
31546	RemyDegenne author:RemyDegenne	feat: MeasurableSet.iff	Add two lemmas: `MeasurableSet.imp (hs : MeasurableSet {x \| p x}) (ht : MeasurableSet {x \| q x}) : MeasurableSet {x \| p x → q x}` `MeasurableSet.iff (hs : MeasurableSet {x \| p x}) (ht : MeasurableSet {x \| q x}) : MeasurableSet {x \| p x ↔ q x}` From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	14/0	Mathlib/MeasureTheory/MeasurableSpace/Defs.lean	1	3	['EtienneC30', 'github-actions']	nobody	0-72200 20 hours ago	0-72200 20 hours ago	1-66139 1 day
31545	RemyDegenne author:RemyDegenne	feat: products of identically distributed random variables	If `X` and `Y` are independent random variables, `Z` and `W` are independent random variables, such that `X` and `Z` are identically distributed and `Y` and `W` are identically distributed, then the pairs `(X, Y)` and `(Z, W)` are identically distributed. Also add a similar result for products of countably many random variables. From the LeanBandits project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	69/0	Mathlib.lean,Mathlib/Probability/IdentDistribIndep.lean	2	3	['EtienneC30', 'github-actions']	nobody	0-71821 19 hours ago	0-71821 19 hours ago	0-81173 22 hours
31583	kebekus author:kebekus	feat: describe the logarithmic counting function in terms of circle averages	Deliver on an open TODO and describe the logarithmic counting function in terms of circle averages. This material is used in [Project VD](https://github.com/kebekus/ProjectVD), which aims to formalize Value Distribution Theory for meromorphic functions on the complex plane. The material established here is a step towards Cartan's classic formula for the Nevanlinna characteristic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	68/4	Mathlib/Analysis/Complex/ValueDistribution/CountingFunction.lean,Mathlib/Topology/LocallyFinsupp.lean	2	2	['github-actions', 'kebekus']	nobody	0-70267 19 hours ago	0-70267 19 hours ago	0-76797 21 hours
31574	kim-em author:kim-em	feat: lemmas for paths-up-to-homotopy	We introduce `Path.Homotopic.Quotient.mk` as the normal form (rather than `_root_.Quotient.mk`) for constructing a path-up-to-homotopy from a path. This enables us to work more easily in the quotient. We add simp lemmas corresponding to the basic homotopies relating `refl` / `symm` / `trans` / `cast`.	t-algebraic-topology t-topology	199/30	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean	6	1	['github-actions']	nobody	0-69437 19 hours ago	0-69437 19 hours ago	1-19388 1 day
31434	stepanholub author:stepanholub	feat: simple divisibility lemma	--- Add a simple lemma about divisibility. It can be seen as a description of the last step of the Euclidean algorithm (when only subtraction is used)	t-data new-contributor	6/0	Mathlib/Data/Nat/GCD/Basic.lean	1	9	['github-actions', 'grunweg', 'ocfnash', 'stepanholub', 'wwylele']	nobody	0-68510 19 hours ago	0-68511 19 hours ago	4-54490 4 days
31544	RemyDegenne author:RemyDegenne	feat: add `MeasureTheory.Measure.integrable_comp_iff`	Necessary and sufficient condition for `Integrable f (κ ∘ₘ μ)`, integrability with respect to the composition of a kernel and a measure. Special case of `ProbabilityTheory.integrable_comp_iff`, which is about composition of two kernels. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	8/0	Mathlib/Probability/Kernel/Composition/IntegralCompProd.lean	1	2	['EtienneC30', 'github-actions']	nobody	0-68424 19 hours ago	0-68424 18 hours ago	1-67821 1 day
31451	jsm28 author:jsm28	feat(Analysis/Convex/Combination): `centerMass_const`, `centerMass_congr`	Add the lemma: ```lean lemma Finset.centerMass_const (hw : ∑ j ∈ t, w j ≠ 0) (c : E) : t.centerMass w (Function.const _ c) = c := by ``` along with various congruence lemmas that help with applying this in cases where the points are constant for the nonzero weights in `t`, but not necessarily everywhere. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry maintainer-merge t-analysis	28/0	Mathlib/Analysis/Convex/Combination.lean	1	4	['Ruben-VandeVelde', 'github-actions', 'j-loreaux', 'jsm28']	nobody	0-67831 18 hours ago	0-67831 18 hours ago	3-83397 3 days
31493	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): `incenter_mem_interior`	Add a direct statement that the incenter of a simplex lies in its interior (along with factoring out a lemma `excenterWeights_empty_pos` that turns out to be useful several times in its proof). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-euclidean-geometry	21/2	Mathlib/Geometry/Euclidean/Incenter.lean	1	3	['Ruben-VandeVelde', 'github-actions']	nobody	0-66742 18 hours ago	0-67589 18 hours ago	3-17595 3 days
31579	xroblot author:xroblot	feat(Data/Nat/Digits): prove the bijection induced by `Nat.ofDigits` and use it to compute the sum of the sum of digits	We prove that `Nat.ofDigits` induces a bijection between the set of list of natural integers of length `l` with coefficients `< b` and the set of natural integers `< b ^ l` and develop some API. As a application, we prove that ```lean theorem Nat.sum_digits_sum_eq {b : ℕ} (hb : 1 < b) (l : ℕ) : ∑ x ∈ Finset.range (b ^ l), (b.digits x).sum = l * b ^ (l - 1) * b.choose 2 ``` ---	t-data	186/0	Mathlib/Data/Nat/Digits/Lemmas.lean	1	3	['eric-wieser', 'github-actions', 'xroblot']	nobody	0-66676 18 hours ago	0-81376 22 hours ago	0-81410 22 hours
31062	zcyemi author:zcyemi	feat(Geometry/Euclidean/Similarity): add triangle similarity	--- Add theorems about similarity of triangles. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	284/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Similarity.lean,Mathlib/Topology/MetricSpace/Similarity.lean	3	19	['github-actions', 'jsm28', 'zcyemi']	nobody	0-66608 18 hours ago	1-54549 1 day ago	1-81399 1 day
31590	SuccessMoses author:SuccessMoses	Add `simp` attr to `commutatorElement_def`	Add `simp` attribute to `commutatorElement_def` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	1/0	Mathlib/Algebra/Group/Commutator.lean	1	1	['github-actions']	nobody	0-65187 18 hours ago	0-65198 18 hours ago	0-65236 18 hours
31591	gasparattila author:gasparattila	chore(Topology/Sets): use prefix naming for `toCompacts` in `simps`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	6/8	Mathlib/Topology/Sets/Compacts.lean	1	1	['github-actions']	nobody	0-64637 17 hours ago	0-64640 17 hours ago	0-64680 17 hours
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/)		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	7	['github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	0-63548 17 hours ago	0-63568 17 hours ago	0-0 0 seconds
31592	gasparattila author:gasparattila	chore(Tactic/Measurability): `fun_prop` lemmas for solving `MeasurableSet {x \| ...}` goals	Currently, lemmas of the form `MeasurableSet {x \| ...}` cannot be used by `measurability`, because `simp` changes the goal to `Measurable fun x => ...`. This PR adds the necessary `fun_prop` lemmas so that they work with `measurability` (except for statements involving equality, which are done in #31512). This fixes #26620. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	13/7	Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,MathlibTest/measurability.lean	3	1	['github-actions']	nobody	0-61408 17 hours ago	0-61408 17 hours ago	0-61445 17 hours
31341	dagurtomas author:dagurtomas	feat(CategoryTheory): constructors for monoidal functors after pre/post composing with monoidal equivalences	--- - [x] depends on: #30825 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	46/0	Mathlib/CategoryTheory/Monoidal/Functor.lean	1	5	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	robin-carlier assignee:robin-carlier	0-61069 16 hours ago	0-61069 16 hours ago	5-70056 5 days
30039	JovanGerb author:JovanGerb	feat(push): `push` annotations for `Real.log`	This PR adds `push` annotations, and tests for `Real.log`. It also updates the `#push` and `#pull` commands so that they can take a discharger, and can take any head. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	47/18	Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Tactic/Push.lean,MathlibTest/push.lean	4	9	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	0-60779 16 hours ago	2-62069 2 days ago	28-41247 28 days
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/)	t-algebra label:t-algebra$	26/0	Mathlib/Algebra/MonoidAlgebra/Basic.lean	1	2	['github-actions', 'themathqueen']	nobody	0-60772 16 hours ago	0-61279 17 hours ago	0-61333 17 hours
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/)	t-meta awaiting-author	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	13	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	grunweg assignee:grunweg	0-60373 16 hours ago	2-55720 2 days ago	23-81049 23 days
31518	YaelDillies author:YaelDillies	chore(LinearAlgebra/Matrix): import less analysis	Follow up to #31480. Also fix a few namespacing issues that arose. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis	128/119	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/Matrix/Hermitian.lean,Mathlib/Analysis/Matrix/LDL.lean,Mathlib/Analysis/Matrix/PosDef.lean,Mathlib/Analysis/Matrix/Spectrum.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	9	19	['Ruben-VandeVelde', 'YaelDillies', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	0-58738 16 hours ago	1-76045 1 day ago	2-17743 2 days
31336	chrisflav author:chrisflav	feat(CategoryTheory/Sites): cover of pullback from cover of left or right component	To construct this, we also add a typeclass `Precoverage.RespectsIso` that asserts that a pre-`0`-hypercover being covering for a precoverage `J` implies being covering for every isomorphic pre-`0`-hypercover. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	174/0	Mathlib/CategoryTheory/Sites/Hypercover/Zero.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	2	4	['chrisflav', 'github-actions', 'joelriou']	riccardobrasca assignee:riccardobrasca	0-58248 16 hours ago	0-58248 16 hours ago	6-38348 6 days
31217	YaelDillies author:YaelDillies	feat: turn a closed walk into a cycle	From the ProofBench workshop Closes #23637, which does the same thing under a stronger hypothesis on the starting closed walk. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	50/18	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Paths.lean,Mathlib/Combinatorics/SimpleGraph/Trails.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean	4	8	['MrQubo', 'SnirBroshi', 'YaelDillies', 'github-actions']	nobody	0-58201 16 hours ago	10-69132 10 days ago	10-69309 10 days
31569	sgouezel author:sgouezel	feat: drop a finiteness assumptions in covariance results	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	73/15	Mathlib/Probability/Moments/CovarianceBilin.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean	2	7	['EtienneC30', 'github-actions', 'sgouezel']	nobody	0-57126 15 hours ago	1-32238 1 day ago	1-32276 1 day
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 label:t-algebra$	209/101	Mathlib/Algebra/Order/Ring/Ordering/Defs.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/GradedAlgebra/Radical.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/IsPrimary.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Maximal.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/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	21	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	0-55400 15 hours ago	0-55400 15 hours ago	0-60092 16 hours
30071	Jlh18 author:Jlh18	feat: dualize Pseudofunctor.CoGrothendieck results to Pseudofunctor.Grothendieck	Continuing from #29681, dualize all definitions and lemmas in the namespace `Pseudofunctor.CoGrothendieck` to results in the namespace `Pseudofunctor.Grothendieck`. - [x] depends on: #29681 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	118/10	Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	1	16	['Jlh18', 'callesonne', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	riccardobrasca assignee:riccardobrasca	0-54191 15 hours ago	0-54191 15 hours ago	37-15865 37 days
31415	SnirBroshi author:SnirBroshi	feat(NumberTheory/Niven): `exp(q π i)` is integral for rational `q`	--- And hooray for surpassing `⌊ π * 10⁴ ⌋` PRs 🎉 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory awaiting-author	76/23	Mathlib/NumberTheory/Niven.lean	1	9	['MichaelStollBayreuth', 'github-actions']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-50162 13 hours ago	0-50162 13 hours ago	4-33393 4 days
27606	CBirkbeck author:CBirkbeck	Eisenstein q exp identity	--- - [x] depends on: #26016 - [x] depends on: #27212 - [x] depends on: #27837 - [x] depends on: #27839 - [x] depends on: #27840 - [x] depends on: #28690 - [x] depends on: #27838 - [x] depends on: #27841 - [x] depends on: #27844 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-author	115/6	Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean	1	30	['MichaelStollBayreuth', 'dagurtomas', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	0-49420 13 hours ago	0-49420 13 hours ago	32-6406 32 days
30594	j-loreaux author:j-loreaux	feat: generalize continuity results for the continuous functional calculus	Under suitable conditions `x ↦ cfc f (a x)` is continuous. Previously these conditions were that there was a single compact set on which `f` was continuous, and which contained the spectra of all `a x`. However, this is a bit too stringent for some purposes and so we generalize it here. In particular, it suffices that the spectra `a x` are covered by a family of compact sets `s x` (on each of which `f` is continuous) satisfying the property that each `s x₀` contains the spectra `a x` for `x` sufficiently close to `x₀`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	144/53	Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Continuity.lean	1	4	['dupuisf', 'github-actions', 'j-loreaux']	ADedecker and dupuisf assignee:dupuisf assignee:ADedecker	0-46574 12 hours ago	29-34596 29 days ago	29-34582 29 days
30842	kim-em author:kim-em	feat: add Aristotle task for command palette	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	128/0	.vscode/tasks.json,scripts/README.md,scripts/aristotle/README.md	3	17	['eric-wieser', 'euprunin', 'github-actions', 'kim-em', 'vikram-shanker']	robertylewis assignee:robertylewis	0-42653 11 hours ago	21-11050 21 days ago	21-11086 21 days
31031	gasparattila author:gasparattila	feat(Topology/UniformSpace): define the Hausdorff uniformity	This PR defines the Hausdorff uniformity on `Closeds`, `Compacts` and `NonemptyCompacts`. Since `Closeds` and `NonemptyCompacts` already have metrics, they are changed to use the newly defined uniformity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	328/31	Mathlib.lean,Mathlib/Data/Rel.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/UniformSpace/Closeds.lean	6	5	['gasparattila', 'github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	0-40887 11 hours ago	8-59702 8 days ago	16-37399 16 days
31601	BoltonBailey author:BoltonBailey	feat(Data/Nat/Choose): A new strictly positive binomial coefficient	This is an experimental PR relating to replacing `Nat.choose` with a strictly positive function equivalently to `Nat.choose a (a + b)` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	66/0	Mathlib/Data/Nat/Choose/Binomial.lean	1	1	['github-actions']	nobody	0-40646 11 hours ago	0-40684 11 hours ago	0-0 0 seconds
31433	sinhp author:sinhp	feat (CategoryTheory): Computable cartesian monoidal structure on slices induced by chosen pullbacks	We provide for a category `C` with chosen pullbacks, a cartesian monoidal structure on the slice categories `Over X` for all objects `X : C`. We also show that the functor `pullback f : Over X ⥤ Over Y` is naturally isomorphic to `toOver (Over.mk f): Over X ⥤ Over (Over.mk f)` post-composed with the iterated slice equivalence `Over (Over.mk f) ⥤ Over Y`. This latter theorem will be crucial in relating closed objects in the slices to exponentiable morphisms in the base in `LocallyCartesianClosed.Basic.lean` (Here `toOver` is defined to be the computable analogue of the functor `Over.star`.) ```mermaid graph TD A[ChosenPullbackAlong.lean] --> A'[Over.lean] A' --> B[Sections.lean] A' --> C[ExponentiableMorphism.lean] B --> D[Basic.lean] C --> D D --> E[Types.lean] E --> F[Presheaves.lean] D --> G[Beck-Chevalley.lean] %% Define highlight style classDef highlight fill:#ffe599,stroke:#d4a017,stroke-width:2px; %% Apply to one node class A' highlight; ``` --- - [ ] depends on: #31033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	438/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Over.lean	3	9	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	0-39780 11 hours ago	0-39780 11 hours ago	0-67458 18 hours
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-algebra t-topology t-number-theory label:t-algebra$	227/62	Mathlib/NumberTheory/LocalField/Basic.lean,Mathlib/Order/Filter/Bases/Basic.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	3	71	['erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky', 'smmercuri']	alreadydone assignee:alreadydone	0-39624 11 hours ago	2-36619 2 days ago	84-50396 84 days
30505	mariainesdff author:mariainesdff	feat(NumberTheory/RatFunc/Ostrowski): prove Ostrowski's theorem for K(X)	We prove Ostrowski's theorem for the field of rational functions `K(X)`, where `K` is any field. Co-authored-by: @xgenereux --- - [x] depends on: #30404 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-number-theory awaiting-author label:t-algebra$	332/2	Mathlib.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Degree.lean,Mathlib/NumberTheory/RatFunc/Ostrowski.lean	4	30	['MichaelStollBayreuth', 'alreadydone', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	MichaelStollBayreuth assignee:MichaelStollBayreuth	0-36905 10 hours ago	13-32854 13 days ago	2-41405 2 days
31399	CoolRmal author:CoolRmal	feat: Conditional expectation commutes with continuous linear functionals and affine functions.	This lemma is needed in the proof of conditional Jensen's inequality: #27953 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	29/0	Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean	1	17	['CoolRmal', 'EtienneC30', 'github-actions']	EtienneC30 assignee:EtienneC30	0-36122 10 hours ago	0-36365 10 hours ago	5-26900 5 days
31161	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPolynomial/IrrQuadratic): irreducibility of sum X_i Y_i	For $n\geq 2$, the polynomial $$\sum_{i=1}^n X_i Y_i$$ is irreducible. This was used in the initial proof that the transvections have determinant 1. Now, a more general result is proved there and this PR is no more needed. I believe that it remains of independent interest (irreducibility of quadrics in algebraic geometry) but the maintainers might want that the general one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		230/0	Mathlib.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/RingTheory/MvPolynomial/IrrQuadratic.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean	4	7	['AntoineChambert-Loir', 'github-actions', 'joelriou']	joelriou assignee:joelriou	0-33662 9 hours ago	0-61996 17 hours ago	11-49082 11 days
31605	euprunin author:euprunin	chore(Combinatorics/SimpleGraph): golf `circulantGraph_eq_symm` using `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	3/5	Mathlib/Combinatorics/SimpleGraph/Circulant.lean	1	1	['github-actions']	nobody	0-33135 9 hours ago	0-33852 9 hours ago	0-33896 9 hours
31534	euprunin author:euprunin	chore(Probability/ProbabilityMassFunction): golf entire `support_bindOnSupport` using `ext; simp`	--- Show trace profiling of `support_bindOnSupport`: 85 ms before, 219 ms after ### Trace profiling of `support_bindOnSupport` before PR 31534 ```diff diff --git a/Mathlib/Probability/ProbabilityMassFunction/Monad.lean b/Mathlib/Probability/ProbabilityMassFunction/Monad.lean index 876540f3fb..120616c4bd 100644 --- a/Mathlib/Probability/ProbabilityMassFunction/Monad.lean +++ b/Mathlib/Probability/ProbabilityMassFunction/Monad.lean @@ -198,6 +198,7 @@ variable {p : PMF α} (f : ∀ a ∈ p.support, PMF β) theorem bindOnSupport_apply (b : β) : p.bindOnSupport f b = ∑' a, p a * if h : p a = 0 then 0 else f a h b := rfl +set_option trace.profiler true in @[simp] theorem support_bindOnSupport : (p.bindOnSupport f).support = ⋃ (a : α) (h : a ∈ p.support), (f a h).support := by ``` ``` ℹ [1634/1634] Built Mathlib.Probability.ProbabilityMassFunction.Monad (1.7s) info: Mathlib/Probability/ProbabilityMassFunction/Monad.lean:202:0: [Elab.async] [0.086185] elaborating proof of PMF.support_bindOnSupport [Elab.definition.value] [0.085203] PMF.support_bindOnSupport [Elab.step] [0.084834] refine Set.ext fun b => ?_ simp only [ENNReal.tsum_eq_zero, not_or, mem_support_iff, bindOnSupport_apply, Ne, not_forall, mul_eq_zero, Set.mem_iUnion] exact ⟨fun hb => let ⟨a, ⟨ha, ha'⟩⟩ := hb ⟨a, ha, by simpa [ha] using ha'⟩, fun hb => let ⟨a, ha, ha'⟩ := hb ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩⟩ [Elab.step] [0.084829] refine Set.ext fun b => ?_ simp only [ENNReal.tsum_eq_zero, not_or, mem_support_iff, bindOnSupport_apply, Ne, not_forall, mul_eq_zero, Set.mem_iUnion] exact ⟨fun hb => let ⟨a, ⟨ha, ha'⟩⟩ := hb ⟨a, ha, by simpa [ha] using ha'⟩, fun hb => let ⟨a, ha, ha'⟩ := hb ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩⟩ [Elab.step] [0.018183] simp only [ENNReal.tsum_eq_zero, not_or, mem_support_iff, bindOnSupport_apply, Ne, not_forall, mul_eq_zero, Set.mem_iUnion] [Elab.step] [0.066410] exact ⟨fun hb => let ⟨a, ⟨ha, ha'⟩⟩ := hb ⟨a, ha, by simpa [ha] using ha'⟩, fun hb => let ⟨a, ha, ha'⟩ := hb ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩⟩ [Elab.step] [0.015660] expected type: (∃ x, ¬p x = 0 ∧ ¬(if h : p x = 0 then 0 else (f x h) b) = 0) ↔ ∃ i, ∃ (h : ¬p i = 0), ¬(f i ⋯) b = 0, term ⟨fun hb => let ⟨a, ⟨ha, ha'⟩⟩ := hb ⟨a, ha, by simpa [ha] using ha'⟩, fun hb => let ⟨a, ha, ha'⟩ := hb ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩⟩ [Elab.step] [0.015638] expected type: (∃ x, ¬p x = 0 ∧ ¬(if h : p x = 0 then 0 else (f x h) b) = 0) ↔ ∃ i, ∃ (h : ¬p i = 0), ¬(f i ⋯) b = 0, term Iff.intro✝ (fun hb => let ⟨a, ⟨ha, ha'⟩⟩ := hb ⟨a, ha, by simpa [ha] using ha'⟩) fun hb => let ⟨a, ha, ha'⟩ := hb ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩ [Elab.step] [0.026635] simpa [ha] using ha' [Elab.step] [0.026629] simpa [ha] using ha' [Elab.step] [0.026622] simpa [ha] using ha' [Elab.step] [0.023173] simpa [(mem_support_iff _ a).1 ha] using ha' [Elab.step] [0.023168] simpa [(mem_support_iff _ a).1 ha] using ha' [Elab.step] [0.023160] simpa [(mem_support_iff _ a).1 ha] using ha' Build completed successfully (1634 jobs). ``` ### Trace profiling of `support_bindOnSupport` after PR 31534 ```diff diff --git a/Mathlib/Probability/ProbabilityMassFunction/Monad.lean b/Mathlib/Probability/ProbabilityMassFunction/Monad.lean index 876540f3fb..1e5f9ddbe1 100644 --- a/Mathlib/Probability/ProbabilityMassFunction/Monad.lean +++ b/Mathlib/Probability/ProbabilityMassFunction/Monad.lean @@ -198,19 +198,12 @@ variable {p : PMF α} (f : ∀ a ∈ p.support, PMF β) theorem bindOnSupport_apply (b : β) : p.bindOnSupport f b = ∑' a, p a * if h : p a = 0 then 0 else f a h b := rfl +set_option trace.profiler true in @[simp] theorem support_bindOnSupport : (p.bindOnSupport f).support = ⋃ (a : α) (h : a ∈ p.support), (f a h).support := by - refine Set.ext fun b => ?_ - simp only [ENNReal.tsum_eq_zero, not_or, mem_support_iff, bindOnSupport_apply, Ne, not_forall, - mul_eq_zero, Set.mem_iUnion] - exact - ⟨fun hb => - let ⟨a, ⟨ha, ha'⟩⟩ := hb - ⟨a, ha, by simpa [ha] using ha'⟩, - fun hb => - let ⟨a, ha, ha'⟩ := hb - ⟨a, ⟨ha, by simpa [(mem_support_iff _ a).1 ha] using ha'⟩⟩⟩ + ext + simp theorem mem_support_bindOnSupport_iff (b : β) : b ∈ (p.bindOnSupport f).support ↔ ∃ (a : α) (h : a ∈ p.support), b ∈ (f a h).support := by ``` ``` ℹ [1634/1634] Built Mathlib.Probability.ProbabilityMassFunction.Monad (1.6s) info: Mathlib/Probability/ProbabilityMassFunction/Monad.lean:202:0: [Elab.async] [0.219192] elaborating proof of PMF.support_bindOnSupport [Elab.definition.value] [0.218516] PMF.support_bindOnSupport [Elab.step] [0.217487] ext simp [Elab.step] [0.217480] ext simp [Elab.step] [0.217277] simp [Meta.Tactic.simp.discharge] [0.024024] tsum_empty discharge ❌️ IsEmpty α [Meta.synthInstance] [0.023614] ❌️ Nonempty α Build completed successfully (1634 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability	2/10	Mathlib/Probability/ProbabilityMassFunction/Monad.lean	1	1	['github-actions']	nobody	0-33111 9 hours ago	1-77247 1 day ago	1-77286 1 day
31598	euprunin author:euprunin	chore(Data/List): golf `ofFn_eq_pmap` using `ext; grind`	--- Show trace profiling of `ofFn_eq_pmap`: 24 ms before, 74 ms after ### Trace profiling of `ofFn_eq_pmap` before PR 31598 ```diff diff --git a/Mathlib/Data/List/FinRange.lean b/Mathlib/Data/List/FinRange.lean index 85f6e14dba..6e76b6640f 100644 --- a/Mathlib/Data/List/FinRange.lean +++ b/Mathlib/Data/List/FinRange.lean @@ -76,6 +76,7 @@ theorem map_coe_finRange (n : ℕ) : ((finRange n) : List (Fin n)).map (Fin.val) theorem finRange_succ_eq_map (n : ℕ) : finRange n.succ = 0 :: (finRange n).map Fin.succ := finRange_succ +set_option trace.profiler true in theorem ofFn_eq_pmap {n} {f : Fin n → α} : ofFn f = pmap (fun i hi => f ⟨i, hi⟩) (range n) fun _ => mem_range.1 := by rw [pmap_eq_map_attach] ``` ``` ℹ [529/529] Built Mathlib.Data.List.FinRange (1.0s) info: Mathlib/Data/List/FinRange.lean:80:0: [Elab.async] [0.024331] elaborating proof of List.ofFn_eq_pmap [Elab.definition.value] [0.023824] List.ofFn_eq_pmap [Elab.step] [0.023649] rw [pmap_eq_map_attach] exact ext_getElem (by simp) fun i hi1 hi2 => by simp [List.getElem_ofFn hi1] [Elab.step] [0.023643] rw [pmap_eq_map_attach] exact ext_getElem (by simp) fun i hi1 hi2 => by simp [List.getElem_ofFn hi1] [Elab.step] [0.022707] exact ext_getElem (by simp) fun i hi1 hi2 => by simp [List.getElem_ofFn hi1] [Elab.step] [0.012198] simp [List.getElem_ofFn hi1] [Elab.step] [0.012193] simp [List.getElem_ofFn hi1] [Elab.step] [0.012186] simp [List.getElem_ofFn hi1] Build completed successfully (529 jobs). ``` ### Trace profiling of `ofFn_eq_pmap` after PR 31598 ```diff diff --git a/Mathlib/Data/List/FinRange.lean b/Mathlib/Data/List/FinRange.lean index 85f6e14dba..5ef8e4c1d0 100644 --- a/Mathlib/Data/List/FinRange.lean +++ b/Mathlib/Data/List/FinRange.lean @@ -76,10 +76,11 @@ theorem map_coe_finRange (n : ℕ) : ((finRange n) : List (Fin n)).map (Fin.val) theorem finRange_succ_eq_map (n : ℕ) : finRange n.succ = 0 :: (finRange n).map Fin.succ := finRange_succ +set_option trace.profiler true in theorem ofFn_eq_pmap {n} {f : Fin n → α} : ofFn f = pmap (fun i hi => f ⟨i, hi⟩) (range n) fun _ => mem_range.1 := by - rw [pmap_eq_map_attach] - exact ext_getElem (by simp) fun i hi1 hi2 => by simp [List.getElem_ofFn hi1] + ext + grind theorem ofFn_id (n) : ofFn id = finRange n := rfl ``` ``` ℹ [529/529] Built Mathlib.Data.List.FinRange (1.0s) info: Mathlib/Data/List/FinRange.lean:80:0: [Elab.async] [0.074365] elaborating proof of List.ofFn_eq_pmap [Elab.definition.value] [0.074039] List.ofFn_eq_pmap [Elab.step] [0.073924] ext grind [Elab.step] [0.073917] ext grind [Elab.step] [0.073402] grind Build completed successfully (529 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/2	Mathlib/Data/List/FinRange.lean	1	1	['github-actions']	nobody	0-32930 9 hours ago	0-46905 13 hours ago	0-46952 13 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/)	t-meta	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	1	['JovanGerb', 'github-actions']	nobody	0-32928 9 hours ago	0-32928 9 hours ago	0-32908 9 hours
31599	euprunin author:euprunin	chore(Data/List): golf `insertIdx_pmap` using `ext; grind`	--- Show trace profiling of `insertIdx_pmap`: 51 ms before, 285 ms after ### Trace profiling of `insertIdx_pmap` before PR 31599 ```diff diff --git a/Mathlib/Data/List/InsertIdx.lean b/Mathlib/Data/List/InsertIdx.lean index b90a16262e..43de114107 100644 --- a/Mathlib/Data/List/InsertIdx.lean +++ b/Mathlib/Data/List/InsertIdx.lean @@ -63,6 +63,7 @@ theorem insertIdx_subset_cons (n : ℕ) (a : α) (l : List α) : l.insertIdx n a intro b hb simpa using eq_or_mem_of_mem_insertIdx hb +set_option trace.profiler true in theorem insertIdx_pmap {p : α → Prop} (f : ∀ a, p a → β) {l : List α} {a : α} {n : ℕ} (hl : ∀ x ∈ l, p x) (ha : p a) : (l.pmap f hl).insertIdx n (f a ha) = (l.insertIdx n a).pmap f ``` ``` ℹ [452/452] Built Mathlib.Data.List.InsertIdx (997ms) info: Mathlib/Data/List/InsertIdx.lean:67:0: [Elab.async] [0.051760] elaborating proof of List.insertIdx_pmap [Elab.definition.value] [0.050893] List.insertIdx_pmap [Elab.step] [0.050251] induction n generalizing l with \| zero => cases l <;> simp \| succ n ihn => cases l <;> simp_all [Elab.step] [0.050245] induction n generalizing l with \| zero => cases l <;> simp \| succ n ihn => cases l <;> simp_all [Elab.step] [0.050239] induction n generalizing l with \| zero => cases l <;> simp \| succ n ihn => cases l <;> simp_all [Elab.step] [0.046111] cases l <;> simp_all [Elab.step] [0.046075] cases l <;> simp_all [Elab.step] [0.046069] (cases l) <;> simp_all [Elab.step] [0.046061] focus cases l with_annotate_state"<;>" skip all_goals simp_all [Elab.step] [0.046055] cases l with_annotate_state"<;>" skip all_goals simp_all [Elab.step] [0.046051] cases l with_annotate_state"<;>" skip all_goals simp_all [Elab.step] [0.045526] all_goals simp_all [Elab.step] [0.024558] simp_all [Elab.step] [0.024554] simp_all [Elab.step] [0.024544] simp_all [Meta.Tactic.simp.discharge] [0.017061] IsEmpty.forall_iff discharge ❌️ IsEmpty (∀ (x : α), x ∈ l → p x) [Elab.step] [0.020878] simp_all [Elab.step] [0.020871] simp_all [Elab.step] [0.020864] simp_all [Meta.Tactic.simp.discharge] [0.012786] IsEmpty.forall_iff discharge ❌️ IsEmpty (∀ (x : α), x ∈ l → p x) Build completed successfully (452 jobs). ``` ### Trace profiling of `insertIdx_pmap` after PR 31599 ```diff diff --git a/Mathlib/Data/List/InsertIdx.lean b/Mathlib/Data/List/InsertIdx.lean index b90a16262e..77ecfea7cb 100644 --- a/Mathlib/Data/List/InsertIdx.lean +++ b/Mathlib/Data/List/InsertIdx.lean @@ -63,13 +63,13 @@ theorem insertIdx_subset_cons (n : ℕ) (a : α) (l : List α) : l.insertIdx n a intro b hb simpa using eq_or_mem_of_mem_insertIdx hb +set_option trace.profiler true in theorem insertIdx_pmap {p : α → Prop} (f : ∀ a, p a → β) {l : List α} {a : α} {n : ℕ} (hl : ∀ x ∈ l, p x) (ha : p a) : (l.pmap f hl).insertIdx n (f a ha) = (l.insertIdx n a).pmap f (fun _ h ↦ (eq_or_mem_of_mem_insertIdx h).elim (fun heq ↦ heq ▸ ha) (hl _)) := by - induction n generalizing l with - \| zero => cases l <;> simp - \| succ n ihn => cases l <;> simp_all + ext + grind theorem map_insertIdx (f : α → β) (l : List α) (n : ℕ) (a : α) : (l.insertIdx n a).map f = (l.map f).insertIdx n (f a) := by ``` ``` ℹ [452/452] Built Mathlib.Data.List.InsertIdx (1.2s) info: Mathlib/Data/List/InsertIdx.lean:67:0: [Elab.async] [0.286042] elaborating proof of List.insertIdx_pmap [Elab.definition.value] [0.284883] List.insertIdx_pmap [Elab.step] [0.284702] ext grind [Elab.step] [0.284696] ext grind [Elab.step] [0.284160] grind info: Mathlib/Data/List/InsertIdx.lean:72:2: [Elab.async] [0.012667] Lean.addDecl [Kernel] [0.012657] ✅️ typechecking declarations [List.insertIdx_pmap._proof_1_47] Build completed successfully (452 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/3	Mathlib/Data/List/InsertIdx.lean	1	1	['github-actions']	nobody	0-32890 9 hours ago	0-46692 12 hours ago	0-46734 12 hours
31602	euprunin author:euprunin	chore(Data/Set): golf `image_sUnion` using `grind`	--- Show trace profiling of `image_sUnion`: 11 ms before, 32 ms after ### Trace profiling of `image_sUnion` before PR 31602 ```diff diff --git a/Mathlib/Data/Set/Lattice/Image.lean b/Mathlib/Data/Set/Lattice/Image.lean index 5f342155da..e416a9f7d3 100644 --- a/Mathlib/Data/Set/Lattice/Image.lean +++ b/Mathlib/Data/Set/Lattice/Image.lean @@ -391,6 +391,7 @@ theorem preimage_iUnion {f : α → β} {s : ι → Set β} : (f ⁻¹' ⋃ i, s theorem preimage_iUnion₂ {f : α → β} {s : ∀ i, κ i → Set β} : (f ⁻¹' ⋃ (i) (j), s i j) = ⋃ (i) (j), f ⁻¹' s i j := by simp_rw [preimage_iUnion] +set_option trace.profiler true in theorem image_sUnion {f : α → β} {s : Set (Set α)} : (f '' ⋃₀ s) = ⋃₀ (image f '' s) := by ext b simp only [mem_image, mem_sUnion, exists_prop, sUnion_image, mem_iUnion] ``` ``` ℹ [414/414] Built Mathlib.Data.Set.Lattice.Image (1.9s) info: Mathlib/Data/Set/Lattice/Image.lean:395:0: [Elab.async] [0.011457] elaborating proof of Set.image_sUnion [Elab.definition.value] [0.010753] Set.image_sUnion [Elab.step] [0.010230] ext b simp only [mem_image, mem_sUnion, exists_prop, sUnion_image, mem_iUnion] constructor · rintro ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ exact ⟨t, ht₁, a, ht₂, rfl⟩ · rintro ⟨t, ht₁, a, ht₂, rfl⟩ exact ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ [Elab.step] [0.010223] ext b simp only [mem_image, mem_sUnion, exists_prop, sUnion_image, mem_iUnion] constructor · rintro ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ exact ⟨t, ht₁, a, ht₂, rfl⟩ · rintro ⟨t, ht₁, a, ht₂, rfl⟩ exact ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ Build completed successfully (414 jobs). ``` ### Trace profiling of `image_sUnion` after PR 31602 ```diff diff --git a/Mathlib/Data/Set/Lattice/Image.lean b/Mathlib/Data/Set/Lattice/Image.lean index 5f342155da..010feb9b00 100644 --- a/Mathlib/Data/Set/Lattice/Image.lean +++ b/Mathlib/Data/Set/Lattice/Image.lean @@ -391,14 +391,11 @@ theorem preimage_iUnion {f : α → β} {s : ι → Set β} : (f ⁻¹' ⋃ i, s theorem preimage_iUnion₂ {f : α → β} {s : ∀ i, κ i → Set β} : (f ⁻¹' ⋃ (i) (j), s i j) = ⋃ (i) (j), f ⁻¹' s i j := by simp_rw [preimage_iUnion] +set_option trace.profiler true in theorem image_sUnion {f : α → β} {s : Set (Set α)} : (f '' ⋃₀ s) = ⋃₀ (image f '' s) := by - ext b - simp only [mem_image, mem_sUnion, exists_prop, sUnion_image, mem_iUnion] - constructor - · rintro ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ - exact ⟨t, ht₁, a, ht₂, rfl⟩ - · rintro ⟨t, ht₁, a, ht₂, rfl⟩ - exact ⟨a, ⟨t, ht₁, ht₂⟩, rfl⟩ + ext + simp only [Set.mem_iUnion, Set.sUnion_image] + grind @[simp] theorem preimage_sUnion {f : α → β} {s : Set (Set β)} : f ⁻¹' ⋃₀ s = ⋃ t ∈ s, f ⁻¹' t := by ``` ``` ℹ [414/414] Built Mathlib.Data.Set.Lattice.Image (1.9s) info: Mathlib/Data/Set/Lattice/Image.lean:395:0: [Elab.async] [0.031914] elaborating proof of Set.image_sUnion [Elab.definition.value] [0.031515] Set.image_sUnion [Elab.step] [0.031392] ext simp only [Set.mem_iUnion, Set.sUnion_image] grind [Elab.step] [0.031386] ext simp only [Set.mem_iUnion, Set.sUnion_image] grind [Elab.step] [0.026423] grind Build completed successfully (414 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	3/7	Mathlib/Data/Set/Lattice/Image.lean	1	1	['github-actions']	nobody	0-32849 9 hours ago	0-40492 11 hours ago	0-40530 11 hours
30913	eric-wieser author:eric-wieser	feat(Computability/Language): add subtraction notation	Defining `-` as set difference seems like a natural thing to do when `+` is set union. The fact that this definition satisfies `OrderedSub` seems to be a good signal that it is a good idea. --- - [x] depends on: #30912 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-computability	22/0	Mathlib/Computability/Language.lean	1	9	['YaelDillies', 'chenson2018', 'ctchou', 'eric-wieser', 'github-actions', 'jessealama', 'mathlib4-dependent-issues-bot']	nobody	0-31202 8 hours ago	7-64152 7 days ago	14-26182 14 days
31563	EtienneC30 author:EtienneC30	feat: small lemma about InnerProductSpace.toDual	Prove `toDual 𝕜 E x = toDualMap 𝕜 E x`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	7/0	Mathlib/Analysis/InnerProductSpace/Dual.lean	1	7	['EtienneC30', 'github-actions', 'themathqueen']	nobody	0-31192 8 hours ago	1-34921 1 day ago	1-34966 1 day
31603	alreadydone author:alreadydone	chore(Algebra): make `RatFunc` an abbrev	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra RFC label:t-algebra$	81/431	Mathlib/FieldTheory/Laurent.lean,Mathlib/FieldTheory/RatFunc/AsPolynomial.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/FieldTheory/RatFunc/Defs.lean	4	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	0-30448 8 hours ago	0-30448 8 hours ago	0-32909 9 hours
31607	grunweg author:grunweg	chore: rename `continuous{,On,At,Within}_const to `ContinuousXXX.const`	Needs some careful thought which of these ought to be protected, and fixing all remaining deprecation warnings. Zulip discussion: [#mathlib4 > Naming convention @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/447491526) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI	86/82	Archive/Hairer.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/RemovableSingularity.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/PartitionOfUnity.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Normed/Module/Ball/Homeomorph.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Integrability/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Integral/CircleIntegral.lean,Mathlib/MeasureTheory/Integral/CircleTransform.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/RieszMarkovKakutani/Real.lean,Mathlib/NumberTheory/LSeries/PrimesInAP.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/GroupWithZero.lean,Mathlib/Topology/Algebra/Indicator.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/Continuous.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/Hom/ContinuousEval.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Order/IntermediateValue.lean,Mathlib/Topology/VectorBundle/Basic.lean	44	1	['github-actions']	nobody	0-30311 8 hours ago	0-30380 8 hours ago	0-1 1 second
31600	grunweg author:grunweg	chore: replace by_cases! with by_cases when the push_neg step does no…	…thing Not exhaustive yet. --- Spun out of #31596. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	29/29	Mathlib/Algebra/Group/Fin/Basic.lean,Mathlib/Algebra/Homology/Embedding/Basic.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/WellOrderContinuous.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Metric.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/GroupTheory/Perm/ClosureSwap.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/ModelTheory/Semantics.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/Topology/Maps/Basic.lean	21	1	['github-actions']	nobody	0-29962 8 hours ago	0-46275 12 hours ago	0-2 2 seconds
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/)	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	1	['github-actions']	nobody	0-29251 8 hours ago	0-55445 15 hours ago	0-1 1 second
31510	JovanGerb author:JovanGerb	feat(contrapose): cancel negations, and support `↔`	This PR introduces two features for `contrapose`: - `contrapose` applied to a goal `p ↔ q` creates the goal `¬p ↔ ¬q`. - Instead of creating double negations, contrapose will try to cancel out double negations that it creates. This will allow for replacing some occurrences of `contrapose!` with `contrapose` (TODO: write a linter for this?). It also allows avoiding classical logic in some cases. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/RFC.3A.20contrapose.20for.20.60a.20.E2.86.94.20b.60/with/554945103) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-meta	172/18	Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/Valuation/ValuationRing.lean,Mathlib/Tactic/Contrapose.lean,MathlibTest/Contrapose.lean	6	21	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	0-29087 8 hours ago	1-65246 1 day ago	1-78029 1 day
31609	JovanGerb author:JovanGerb	fix(rw??): `whnf` on equality hypotheses	This PR adds some missing `whnf` in the `rw??` implementation. This only affects the behaviour of rewriting with local variables. I discovered that sometimes the type can be an uninstantiated metavariable that needs to first instantiated, for example by using `whnf`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	6/6	Mathlib/Tactic/Widget/LibraryRewrite.lean	1	1	['github-actions']	nobody	0-28529 7 hours ago	0-28534 7 hours ago	0-28569 7 hours
31608	JovanGerb author:JovanGerb	fix(unfold?): improved implementation of `isUserFriendly`	This PR fixes `isUserFriendly`, in `unfold?`, for two reasons: - We should only worry about bad constants in the expression if they appear in the visible part of the expression. They should be allowed in e.g. instance implicit arguments. - We don't want to get raw projections, because these are generally not what we want to work with. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	24/7	Mathlib/Tactic/Widget/InteractiveUnfold.lean,MathlibTest/interactiveUnfold.lean	2	4	['JovanGerb', 'github-actions', 'grunweg']	nobody	0-27587 7 hours ago	0-29494 8 hours ago	0-29540 8 hours
31247	rudynicolop author:rudynicolop	feat(Computability/DFA): add DFA complement, union, and intersection	Add theorems for DFA complement, union, and intersection closure, and prove that regular languages are closed under complement, union, and intersection. Note there's a [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Regular.20languages.3A.20the.20review.20queue/with/553522644) regarding PRs for regular languages (also tracked in #24205). Admittedly, this is yet another PR, and this may prove obsolete if other PRs are merged first. In particular, this PR competes with #20238 and #15651. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	124/5	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	34	['ctchou', 'github-actions', 'rudynicolop', 'staroperator']	nobody	0-26231 7 hours ago	9-80181 9 days ago	9-80215 9 days
31523	kim-em author:kim-em	chore: fix version comparison in lake update hook			5/2	lakefile.lean	1	3	['eric-wieser', 'github-actions', 'kim-em']	nobody	0-24823 6 hours ago	0-24876 6 hours ago	1-81203 1 day
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	34/5	Mathlib/Lean/Message.lean	1	1	['github-actions']	nobody	0-23583 6 hours ago	0-23773 6 hours ago	0-23812 6 hours
31244	kim-em author:kim-em	chore: use generic `map_X` lemmas where possible	While thinking about grind annotations for homomorphisms, it occurs to me that automation is more likely when we use the generic, rather than namespaced, lemmas where possible. This is some cleanup in that direction.		817/861	Archive/Examples/Eisenstein.lean,Archive/Wiedijk100Theorems/Partition.lean,Counterexamples/CliffordAlgebraNotInjective.lean,Counterexamples/DirectSumIsInternal.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/Grp/Images.lean,Mathlib/Algebra/Category/Grp/ZModuleEquivalence.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Images.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/CharP/Pi.lean,Mathlib/Algebra/CharP/Subring.lean,Mathlib/Algebra/Colimit/Module.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/DirectSum/Algebra.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FreeAbelianGroup/Finsupp.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Subgroup.lean,Mathlib/Algebra/GroupWithZero/Submonoid/Pointwise.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Lie/BaseChange.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Character.lean,Mathlib/Algebra/Lie/DirectSum.lean,Mathlib/Algebra/Lie/Free.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/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Exact.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MvPolynomial/CommRing.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Algebra/MvPolynomial/Funext.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Action/End.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/TensorProduct.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/StructureSheaf.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Harmonic/Analytic.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/Complex/Trigonometric.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/BoundedContinuousFunctionChar.lean	336	19	['github-actions', 'j-loreaux', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot', 'tb65536']	tb65536 assignee:tb65536	0-23379 6 hours ago	0-23407 6 hours ago	8-32997 8 days
30793	LessnessRandomness author:LessnessRandomness	feat(Analysis/InnerProductSpace/Basic): add a simp lemma	Add a simp lemma (for benchmarking purposes - to see if it doesn't have a bad performance impact). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	46/36	Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Fourier/FiniteAbelian/Orthogonality.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/GramMatrix.lean,Mathlib/Analysis/InnerProductSpace/MeanErgodic.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/InnerProductSpace/TensorProduct.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Geometry/Euclidean/Inversion/Calculus.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Topology/VectorBundle/Riemannian.lean	19	30	['JovanGerb', 'LessnessRandomness', 'fpvandoorn', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	0-23348 6 hours ago	16-80692 16 days ago	1-61891 1 day
31612	JovanGerb author:JovanGerb	chore(Tactic/Translate): rename the `ToAdditive` folder	Rename the folder `ToAdditive` to `Translate`. And rename the file `Frontend` to `Core` (since that now mostly contains the backend code for the translation attributes). Instead of `Translate`, we could also call it e.g. `Translation`, `TranslateAttr` or `TranslationAttr`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-meta	15/18	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ToAdditive.lean,Mathlib/Tactic/ToDual.lean,Mathlib/Tactic/Translate/Core.lean,Mathlib/Tactic/Translate/GuessName.lean,Mathlib/Tactic/Translate/ToAdditive.lean,Mathlib/Tactic/Translate/ToDual.lean,scripts/noshake.json	9	1	['github-actions']	nobody	0-21965 6 hours ago	0-21965 6 hours ago	0-22008 6 hours
27508	chrisflav author:chrisflav	feat(RingTheory): height under ring homomorphism	We show that if `P` lies over `p`, the height of `P` is bounded by the height of `p` plus the height of the image of `P` in `S ⧸ p S`. In a follow-up PR, we show that equality holds if `S` satisfies going-down as an `R`-algebra. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [x] depends on: #28520 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import	101/1	Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean	4	17	['YaelDillies', 'chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	mariainesdff assignee:mariainesdff	0-21707 6 hours ago	3-64600 3 days ago	10-8167 10 days
27821	BGuillemet author:BGuillemet	feat(CategoryTheory/Sites/Sheaf): functorial version of Sheaf.homEquiv	Add two functorial versions of Sheaf.homEquiv, one using `yoneda` and the other using `coyoneda`. --- - [ ] depends on: #27819 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	23/1	Mathlib/CategoryTheory/Sites/Sheaf.lean	1	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	0-21706 6 hours ago	4-47653 4 days ago	4-52107 4 days
29565	joelriou author:joelriou	feat(CategoryTheory): dense functors	A functor `F : C ⥤ D` is dense if `𝟭 D` is a pointwise left Kan extension of `F` along itself, i.e. any `Y : D` is the colimit of all `F.obj X` for all morphisms `F.obj X ⟶ Y` (which is the condition `F.DenseAt Y`). When `F` is full, we show that this is equivalent to saying that the restricted Yoneda functor `D ⥤ Cᵒᵖ ⥤ Type _` is fully faithful. We also show that the range of a dense functor is a strong generator. --- - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29518 - [x] depends on: #29543 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	126/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean	2	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	jcommelin assignee:jcommelin	0-21705 6 hours ago	5-34580 5 days ago	5-34553 5 days
31149	riccardobrasca author:riccardobrasca	feat: power series over a noetherian ring is noetherian	We add that the power series ring over a noetherian ring is noetherian. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory maintainer-merge	287/3	Mathlib.lean,Mathlib/Algebra/Module/SpanRank.lean,Mathlib/RingTheory/PowerSeries/Ideal.lean,Mathlib/RingTheory/PowerSeries/Trunc.lean,docs/references.bib	5	40	['copilot-pull-request-reviewer', 'erdOne', 'github-actions', 'riccardobrasca', 'yapudpill']	erdOne assignee:erdOne	0-21703 6 hours ago	4-31644 4 days ago	10-81556 10 days
31198	YaelDillies author:YaelDillies	feat(Algebra): characterise when a quotient is nontrivial	From BrauerGroup and ClassFieldTheory --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT large-import t-algebra label:t-algebra$	167/133	Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Congruence/Hom.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/FiniteDimensional/Lemmas.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Jacobson/Ring.lean,Mathlib/RingTheory/KrullDimension/NonZeroDivisors.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/Quotient.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/PowerSeries/WeierstrassPreparation.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/RegularSequence.lean,Mathlib/RingTheory/Support.lean,Mathlib/RingTheory/TensorProduct/Finite.lean,Mathlib/RingTheory/Unramified/LocalRing.lean	32	2	['github-actions', 'mathlib4-merge-conflict-bot']	kim-em assignee:kim-em	0-21703 6 hours ago	3-43996 3 days ago	11-38018 11 days
31235	CoolRmal author:CoolRmal	feat (Topology): IsCompletelyPseudoMetrizable	Introduce the notion of IsCompletelyPseudoMetrizable. The main motivation is to prove the first Baire theorem for a completely pseudometrizable space. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/First.20Baire.20theorem --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	146/30	Mathlib/Topology/Baire/CompleteMetrizable.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/Metrizable/CompletelyMetrizable.lean	3	16	['CoolRmal', 'EtienneC30', 'github-actions']	j-loreaux assignee:j-loreaux	0-21702 6 hours ago	5-18889 5 days ago	10-955 10 days
31237	euprunin author:euprunin	chore(Logic/Equiv): golf entire `Perm.subtypeCongr.symm` using `rfl`	--- Show trace profiling of `Perm.subtypeCongr.symm`: 15 ms before, <10 ms after 🎉 ### Trace profiling of `Perm.subtypeCongr.symm` before PR 31237 ```diff diff --git a/Mathlib/Logic/Equiv/Basic.lean b/Mathlib/Logic/Equiv/Basic.lean index 0c39837098..557e0228df 100644 --- a/Mathlib/Logic/Equiv/Basic.lean +++ b/Mathlib/Logic/Equiv/Basic.lean @@ -83,6 +83,7 @@ theorem Perm.subtypeCongr.refl : ext x by_cases h : p x <;> simp [h] +set_option trace.profiler true in @[simp] theorem Perm.subtypeCongr.symm : (ep.subtypeCongr en).symm = Perm.subtypeCongr ep.symm en.symm := by ext x ``` ``` ℹ [310/310] Built Mathlib.Logic.Equiv.Basic (1.5s) info: Mathlib/Logic/Equiv/Basic.lean:87:0: [Elab.async] [0.015219] elaborating proof of Equiv.Perm.subtypeCongr.symm [Elab.definition.value] [0.014659] Equiv.Perm.subtypeCongr.symm [Elab.step] [0.014391] ext x by_cases h : p x · have : p (ep.symm ⟨x, h⟩) := Subtype.property _ simp [h, symm_apply_eq, this] · have : ¬p (en.symm ⟨x, h⟩) := Subtype.property (en.symm _) simp [h, symm_apply_eq, this] [Elab.step] [0.014380] ext x by_cases h : p x · have : p (ep.symm ⟨x, h⟩) := Subtype.property _ simp [h, symm_apply_eq, this] · have : ¬p (en.symm ⟨x, h⟩) := Subtype.property (en.symm _) simp [h, symm_apply_eq, this] Build completed successfully (310 jobs). ``` ### Trace profiling of `Perm.subtypeCongr.symm` after PR 31237 ```diff diff --git a/Mathlib/Logic/Equiv/Basic.lean b/Mathlib/Logic/Equiv/Basic.lean index 0c39837098..f3cfa176a3 100644 --- a/Mathlib/Logic/Equiv/Basic.lean +++ b/Mathlib/Logic/Equiv/Basic.lean @@ -83,14 +83,10 @@ theorem Perm.subtypeCongr.refl : ext x by_cases h : p x <;> simp [h] +set_option trace.profiler true in @[simp] -theorem Perm.subtypeCongr.symm : (ep.subtypeCongr en).symm = Perm.subtypeCongr ep.symm en.symm := by - ext x - by_cases h : p x - · have : p (ep.symm ⟨x, h⟩) := Subtype.property _ - simp [h, symm_apply_eq, this] - · have : ¬p (en.symm ⟨x, h⟩) := Subtype.property (en.symm _) - simp [h, symm_apply_eq, this] +theorem Perm.subtypeCongr.symm : (ep.subtypeCongr en).symm = Perm.subtypeCongr ep.symm en.symm := + rfl @[simp] theorem Perm.subtypeCongr.trans : ``` ``` ℹ [310/310] Built Mathlib.Logic.Equiv.Basic (1.5s) info: Mathlib/Logic/Equiv/Basic.lean:87:0: [Elab.async] [0.010065] elaborating proof of Equiv.Perm.subtypeCongr.symm Build completed successfully (310 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	2/7	Mathlib/Logic/Equiv/Basic.lean	1	1	['github-actions']	fpvandoorn assignee:fpvandoorn	0-21701 6 hours ago	10-30910 10 days ago	10-30944 10 days
31286	bryangingechen author:bryangingechen	ci: make new contributor labeling work for users with a private profile	The search API we switched to in #30859 returns an error when we try to filter for users with a private profile ([example log](https://github.com/leanprover-community/mathlib4/actions/runs/19093647472/job/54548944242?pr=31272)). We switch to searching for closed issues in the repo, which was working before. We then filter these for closed PRs whose titles start with `[Merged by bors] -`. We also include a slight optimization so that we don't have to page through all of a user's closed issues but stop when we find enough that count as merged PRs (>5 at the moment). written with help from Claude --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	41/16	.github/workflows/label_new_contributor.yml	1	8	['Ruben-VandeVelde', 'bryangingechen', 'github-actions']	robertylewis assignee:robertylewis	0-21700 6 hours ago	8-58591 8 days ago	8-58627 8 days
31363	euprunin author:euprunin	chore(LinearAlgebra/AffineSpace): golf entire `attach_affineCombination_of_injective` using `simp`	--- Show trace profiling of `attach_affineCombination_of_injective`: 39 ms before, 83 ms after ### Trace profiling of `attach_affineCombination_of_injective` before PR 31363 ```diff diff --git a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean index dbcbffbf97..80a6e546e8 100644 --- a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean +++ b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean @@ -399,6 +399,7 @@ theorem affineCombination_vsub (w₁ w₂ : ι → k) (p : ι → P) : s.affineCombination k p w₁ -ᵥ s.affineCombination k p w₂ = s.weightedVSub p (w₁ - w₂) := by rw [← AffineMap.linearMap_vsub, affineCombination_linear, vsub_eq_sub] +set_option trace.profiler true in theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by ``` ``` ℹ [1120/1120] Built Mathlib.LinearAlgebra.AffineSpace.Combination (2.4s) info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.command] [0.011952] theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.async] [0.041027] elaborating proof of Finset.attach_affineCombination_of_injective [Elab.definition.value] [0.039381] Finset.attach_affineCombination_of_injective [Elab.step] [0.038759] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy [Elab.step] [0.038753] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) change univ.sum g₁ = (image f univ).sum g₂ have hgf : g₁ = g₂ ∘ f := by ext simp [g₁, g₂] rw [hgf, sum_image] · simp only [g₂, Function.comp_apply] · exact fun _ _ _ _ hxy => hf hxy [Elab.step] [0.014701] simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, Function.comp_apply, AffineMap.coe_mk] Build completed successfully (1120 jobs). ``` ### Trace profiling of `attach_affineCombination_of_injective` after PR 31363 ```diff diff --git a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean index dbcbffbf97..f7919e28b5 100644 --- a/Mathlib/LinearAlgebra/AffineSpace/Combination.lean +++ b/Mathlib/LinearAlgebra/AffineSpace/Combination.lean @@ -399,20 +399,11 @@ theorem affineCombination_vsub (w₁ w₂ : ι → k) (p : ι → P) : s.affineCombination k p w₁ -ᵥ s.affineCombination k p w₂ = s.weightedVSub p (w₁ - w₂) := by rw [← AffineMap.linearMap_vsub, affineCombination_linear, vsub_eq_sub] +set_option trace.profiler true in theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by - simp only [affineCombination, weightedVSubOfPoint_apply, id, vadd_right_cancel_iff, - Function.comp_apply, AffineMap.coe_mk] - let g₁ : s → V := fun i => w (f i) • (f i -ᵥ Classical.choice S.nonempty) - let g₂ : P → V := fun i => w i • (i -ᵥ Classical.choice S.nonempty) - change univ.sum g₁ = (image f univ).sum g₂ - have hgf : g₁ = g₂ ∘ f := by - ext - simp [g₁, g₂] - rw [hgf, sum_image] - · simp only [g₂,Function.comp_apply] - · exact fun _ _ _ _ hxy => hf hxy + simp [affineCombination, hf] theorem attach_affineCombination_coe (s : Finset P) (w : P → k) : s.attach.affineCombination k ((↑) : s → P) (w ∘ (↑)) = s.affineCombination k id w := by ``` ``` ℹ [1120/1120] Built Mathlib.LinearAlgebra.AffineSpace.Combination (2.4s) info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.command] [0.012162] theorem attach_affineCombination_of_injective [DecidableEq P] (s : Finset P) (w : P → k) (f : s → P) (hf : Function.Injective f) : s.attach.affineCombination k f (w ∘ f) = (image f univ).affineCombination k id w := by simp [affineCombination, hf] info: Mathlib/LinearAlgebra/AffineSpace/Combination.lean:403:0: [Elab.async] [0.084734] elaborating proof of Finset.attach_affineCombination_of_injective [Elab.definition.value] [0.083451] Finset.attach_affineCombination_of_injective [Elab.step] [0.082443] simp [affineCombination, hf] [Elab.step] [0.082438] simp [affineCombination, hf] [Elab.step] [0.082430] simp [affineCombination, hf] [Meta.Tactic.simp.discharge] [0.030281] univ_eq_empty discharge ❌️ IsEmpty ↥s [Meta.synthInstance] [0.028689] ❌️ Nonempty ↥s Build completed successfully (1120 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	1/11	Mathlib/LinearAlgebra/AffineSpace/Combination.lean	1	4	['euprunin', 'github-actions', 'grunweg']	nobody	0-21699 6 hours ago	6-35166 6 days ago	6-51525 6 days
31438	b-mehta author:b-mehta	chore(Order/UnorderedInterval): add basic uIoo lemmas	Add a couple of lemmas about uIoo that are already present for uIcc. We also rename `uIoo_subset_uIcc` to `uIoo_subset_uIcc_self` for parity with the ordered version. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	18/1	Mathlib/Order/Interval/Set/UnorderedInterval.lean	1	1	['github-actions']	bryangingechen assignee:bryangingechen	0-21697 6 hours ago	4-51186 4 days ago	4-51220 4 days
31453	kim-em author:kim-em	feat: locally contractible spaces		t-topology	196/0	Mathlib.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Homotopy/LocallyContractible.lean,docs/references.bib	4	1	['github-actions']	nobody	0-21696 6 hours ago	4-19606 4 days ago	4-21563 4 days
31465	bryangingechen author:bryangingechen	ci: Notify Zulip on update dependencies workflow failure	This adds a little bit more monitoring; would have caught the failures fixed by #31457 a little earlier.	CI	13/0	.github/workflows/update_dependencies.yml	1	1	['github-actions']	robertylewis assignee:robertylewis	0-21695 6 hours ago	3-66347 3 days ago	3-66380 3 days
31458	bwangpj author:bwangpj	feat: Subgroup.mem_sup for arbitrary groups when one of the subgroups is normal	We prove Subgroup.mem_sup for arbitrary (not necessarily commutative) groups when one of the subgroups is normal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	18/0	Mathlib/Algebra/Group/Subgroup/Lattice.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	0-21695 6 hours ago	4-301 4 days ago	4-337 4 days
31470	ADedecker author:ADedecker	feat: define test functions in the sense of distribution theory	This code comes from #30278 from @luigi-massacci, who is the main author of this file. I am just opening another PR in order to parallelize the review work, since this doesn't depend on anything. --- I did change one thing from Luigi's code: we want to define `𝓓(Ω, F)` with `Ω : Opens E`, not just `𝓓(E, F)`. This makes the notation slightly more cumbersome when `Ω = E`, but I think we just have to either live with it or find a purely notational trick. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	160/0	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean	3	2	['ADedecker', 'github-actions']	grunweg assignee:grunweg	0-21694 6 hours ago	3-53835 3 days ago	3-53815 3 days
31471	Scarlett-le author:Scarlett-le	feat(LinearAlgebra/AffineSpace): add commutativity lemmas for line parallelism	Adds three lemmas showing that parallelism between lines defined by point pairs is invariant under reversing the order of points.	new-contributor t-algebra label:t-algebra$	12/0	Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Basic.lean	1	1	['github-actions']	ocfnash assignee:ocfnash	0-21693 6 hours ago	3-52608 3 days ago	3-52642 3 days
31475	YaelDillies author:YaelDillies	feat: a pullback of schemes is canonically over the second component	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	161/2	Mathlib/AlgebraicGeometry/Pullbacks.lean	1	1	['github-actions']	dagurtomas assignee:dagurtomas	0-21692 6 hours ago	3-51018 3 days ago	3-51056 3 days
31490	themathqueen author:themathqueen	chore(Algebra): move `QuadraticAlgebra` to `QuadraticAlgebra/Defs`	Since we already have a `QuadraticAlgebra` folder, this should go in there. It looks strange on the documentation otherwise. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-algebra label:t-algebra$	2/2	Mathlib.lean,Mathlib/Algebra/QuadraticAlgebra/Basic.lean,Mathlib/Algebra/QuadraticAlgebra/Defs.lean	3	1	['github-actions']	eric-wieser assignee:eric-wieser	0-21691 6 hours ago	3-28687 3 days ago	3-28731 3 days
31384	harahu author:harahu	doc(Archive): ensure only a single H1 header per file	This PR ensures we only have a single H1 header per lean file in the Archive subdirectory. We do this for the following reasons: - Having more than one H1 header per file is likely to hamper both assistive technologies and SEO, since it introduces ambiguity about what the title of the resulting webpage actually is. - The [documentation style guide](https://leanprover-community.github.io/contribute/doc.html) asks for the title of the file to be H1, any other header in the file-level docstring to be H2, and sectioning headers to be H3. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO maintainer-merge	16/16	Archive/Imo/Imo1975Q1.lean,Archive/Imo/Imo1985Q2.lean,Archive/Imo/Imo1994Q1.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2001Q3.lean,Archive/Imo/Imo2001Q4.lean,Archive/Imo/Imo2001Q5.lean,Archive/Imo/Imo2005Q3.lean,Archive/Imo/Imo2008Q2.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2011Q3.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2015Q6.lean,Archive/Imo/Imo2021Q1.lean	16	3	['github-actions', 'jsm28']	jsm28 assignee:jsm28	0-21434 5 hours ago	0-21434 5 hours ago	5-49999 5 days
31361	alreadydone author:alreadydone	convex subgroups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		353/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Convex.lean	2	1	['github-actions']	nobody	0-21138 5 hours ago	0-64806 17 hours ago	0-0 0 seconds
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/)	t-analysis awaiting-author	51/0	Mathlib.lean,Mathlib/Analysis/Analytic/Dslope.lean	2	12	['github-actions', 'grunweg', 'maksym-radziwill']	nobody	0-15675 4 hours ago	0-31983 8 hours ago	0-3879 1 hour
26770	Jun2M author:Jun2M	feat(Combinatorics/Graph) : subgraph relations on `Graph`	This PR creates a new file `Combinatorics/Graph/Subgraph.lean`. In it, the PR introduces a partial order on graphs by subgraph relation, defines relations `IsInducedSubgraph`, `IsSpanningSubgraph` and `IsClosedSubgraph`. Further, it introduce operations `EdgeRestrict`, `EdgeDelete`, `induce` and `VertexDelete`. Co-authored-by: Peter Nelson --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	363/1	Mathlib.lean,Mathlib/Combinatorics/Graph/Basic.lean,Mathlib/Combinatorics/Graph/Subgraph.lean	3	1	['github-actions']	awainverse assignee:awainverse	0-13912 3 hours ago	132-33179 4 months ago	132-33210 132 days
31159	gasparattila author:gasparattila	feat(Topology/Sets): add `Compacts.toCloseds`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	15/0	Mathlib/Topology/Sets/Compacts.lean	1	5	['gasparattila', 'github-actions', 'mathlib4-merge-conflict-bot', 'urkud']	urkud assignee:urkud	0-9214 2 hours ago	0-63704 17 hours ago	11-53958 11 days
30524	mcdoll author:mcdoll	feat: Basics of Montel spaces	The definition of a Montel space. We only prove the two rather trivial results: (a) every normed Montel space is finite dimensional and (b) for every Montel space `E` the topology of compact convergence on `E →SL[σ] F` is equal to the strong topology. --- - [x] depends on: #30523 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	129/1	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/Montel.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-8402 2 hours ago	0-19973 5 hours ago	0-19947 5 hours
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 #31525 #31574 #31575. Claude wrote most of the text, under my prompting.		1798/32	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Product.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	11	1	['github-actions']	nobody	0-7733 2 hours ago	1-12337 1 day ago	0-0 0 seconds
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. - [ ] depends on: #29284 [Extra lemmas in CategoryTheory.Core] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	159/4	Mathlib.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Core.lean	4	11	['Jlh18', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-6878 1 hour ago	0-6878 1 hour ago	8-4516 8 days
29279	Jlh18 author:Jlh18	feat: free groupoid on a category, free-forgetful adjunction	- define `CategoryTheory.Category.FreeGroupoid` in a file of the same name - show the universal property of this construction, as the initial category localizing all maps in the category. These are the defs `of`, `lift`, and their related theorems - Show that this construction is functorial `CategoryTheory.Category.FreeGroupoid.map` - Convert this to a functor `CategoryTheory.Category.Grpd.free` from `Cat` to `Grpd`, and show that it is left adjoint to the forgetful functor - `CategoryTheory.Grpd.freeForgetAdjunction` - [x] depends on: #29278 - [x] depends on: #30115 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-category-theory awaiting-author	409/21	Mathlib.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoid.lean,Mathlib/CategoryTheory/Groupoid/FreeGroupoidOfCategory.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean	8	54	['Jlh18', 'MichaelStollBayreuth', 'dagurtomas', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	0-6831 1 hour ago	1-39132 1 day ago	43-72313 43 days
31613	xyzw12345 author:xyzw12345	feat(RepresentationTheory/GroupCohomology): Non-abelian Group Cohomology	In this PR, we develop the theory of non-abelian group cohomology, following the section in GTM 67 - Local Fields by Jean-Pierre Serre. We defined H0 and H1, constructed the connection maps, proved the long exact sequence, and constructed natural isomorphisms between our H0, H1 and the existing `groupCohomology` API. Co-authored by: Jiedong Jiang @jjdishere (information of other co-authors will be updated here soon) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra WIP label:t-algebra$	406/0	Mathlib.lean,Mathlib/Algebra/Category/Grp/Zero.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/NonAbelian.lean,Mathlib/RepresentationTheory/Rep.lean	5	1	['github-actions']	nobody	0-6437 1 hour ago	0-6489 1 hour ago	0-13 13 seconds
31392	YaelDillies author:YaelDillies	feat: compute the PMF of a product measure	It is the product of the PMFs. --- - [x] depends on: #31442 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability awaiting-author	29/11	Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/ProductMeasure.lean	3	4	['b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-5388 1 hour ago	0-23050 6 hours ago	3-64763 3 days
28026	kim-em author:kim-em	feat: grind annotations for `Disjoint`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	76/56	Archive/Imo/Imo2001Q3.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/SupIndep.lean,MathlibTest/grind/pairwise_disjoint.lean	11	33	['chrisflav', 'euprunin', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	0-4976 1 hour ago	0-4999 1 hour ago	48-60022 48 days
31074	mcdoll author:mcdoll	feat(Analysis/Normed): extend densely defined LinearMaps to CLM	This PR both adds a new and more user-friendly way to extend a CLM defined on a dense subspace. We also add a definition for the left inverse of a linear map. Before this was only available in an existence statement, which is slightly inconvenient to work with. --- - [x] depends on: #29888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	127/9	Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/LinearAlgebra/Basis/VectorSpace.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/RepresentationTheory/Maschke.lean	4	23	['github-actions', 'grunweg', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'mcdoll']	sgouezel assignee:sgouezel	0-4522 1 hour ago	0-5073 1 hour ago	11-75031 11 days
31614	qawbecrdtey author:qawbecrdtey	chore(Control/Fix): remove redundant import	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data easy	0/1	Mathlib/Control/Fix.lean	1	0	[]	nobody	0-1708 28 minutes ago	0-1780 29 minutes ago	0-1768 29 minutes
31606	euprunin author:euprunin	chore(Data/PNat): deprecate `gcd_eq_left`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	2/6	Mathlib/Data/PNat/Prime.lean	1	2	['github-actions', 'themathqueen']	nobody	0-1617 26 minutes ago	0-33182 9 hours ago	0-33223 9 hours
31615	euprunin author:euprunin	chore(Data/DFinsupp): golf `Data.DFinsupp.Defs` using `grind` and `simp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	13/18	Mathlib/Data/DFinsupp/Defs.lean	1	1	['github-actions']	nobody	0-1579 26 minutes ago	0-1687 27 minutes ago	0-1722 28 minutes
31307	euprunin author:euprunin	chore: golf using the combination `ext` and `grind`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	31/67	Mathlib/Algebra/Polynomial/Reverse.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Finset/Pi.lean,Mathlib/Data/PFun.lean,Mathlib/Data/Part.lean,Mathlib/Order/Interval/Finset/Basic.lean	6	7	['euprunin', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	0-840 14 minutes ago	2-55603 2 days ago	5-44347 5 days
14426	adomani author:adomani	dev: `#min_imps` command	--- [![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	470-82141 1 year ago	483-78522 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict WIP 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	470-82141 1 year ago	484-73136 1 year ago	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/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict WIP	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	470-82140 1 year ago	483-69751 1 year ago	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	470-82140 1 year ago	508-80431 1 year ago	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/)	t-algebra t-algebraic-geometry merge-conflict awaiting-author 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	470-82140 1 year ago	504-22437 1 year ago	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	470-82139 1 year ago	512-76921 1 year ago	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/)	t-order t-topology merge-conflict awaiting-author	31/13	Mathlib/Topology/Semicontinuous.lean	1	3	['sgouezel', 'urkud']	nobody	470-82139 1 year ago	482-59870 1 year ago	0-18175 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	470-82139 1 year ago	512-77048 1 year ago	0-0 0 seconds
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. --- [![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	6	['YaelDillies', 'github-actions', 'grunweg']	nobody	470-82138 1 year ago	484-5329 1 year ago	0-55655 15 hours
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	470-82138 1 year ago	559-57929 1 year ago	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	470-82138 1 year ago	528-41283 1 year ago	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	470-82138 1 year ago	540-82280 1 year ago	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	470-82138 1 year ago	540-82281 1 year ago	0-0 0 seconds
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	11	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'jcommelin', 'urkud']	nobody	470-82138 1 year ago	484-5335 1 year ago	1-73101 1 day
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/)	t-algebra t-meta merge-conflict awaiting-author 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	470-82138 1 year ago	519-77202 1 year ago	5-72414 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/)	t-algebra t-meta merge-conflict 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	470-82138 1 year ago	492-62838 1 year ago	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	470-82138 1 year ago	562-84136 1 year ago	0-0 0 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	470-82138 1 year ago	558-85714 1 year ago	0-0 0 seconds
12936	mattrobball author:mattrobball	chore(Quiver.Opposite): make `Quiver.Hom.op/unop` `abbrev`'s	These are wrappers around the constructor and projection for `Opposite Quiver.Hom _ _`. The projection itself is reducible and with structure eta built in to defeq it seems like we might be making Lean work harder than is necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	39/34	Mathlib/Algebra/Homology/ShortComplex/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/CategoryTheory/Idempotents/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Triangulated/Opposite.lean,Mathlib/Combinatorics/Quiver/Basic.lean	10	9	['YaelDillies', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	470-82138 1 year ago	538-48130 1 year ago	0-0 0 seconds
11617	urkud author:urkud	refactor(Finset): redefine Finset.diag, review API	Redefine `Finset.diag` using `Finset.map`. The new definition doesn't rely on `DecidableEq` and is much more computationally efficient. Also review API and golf proofs here and there. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict awaiting-author	187/181	Archive/Imo/Imo1998Q2.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Energy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Finset/Diag.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Prod.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Sym/Card.lean,Mathlib/Data/Sym/Sym2.lean	13	7	['YaelDillies', 'eric-wieser', 'urkud']	nobody	470-82137 1 year ago	593-33867 1 year ago	1-12270 1 day
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/)	t-analysis merge-conflict awaiting-author	10/4	Mathlib/Analysis/Asymptotics/Asymptotics.lean	1	6	['Ruben-VandeVelde', 'llllvvuu', 'urkud']	nobody	470-82137 1 year ago	482-60004 1 year 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/)	t-topology awaiting-CI merge-conflict	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	470-82136 1 year ago	482-60593 1 year ago	0-832 13 minutes
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	t-category-theory awaiting-CI merge-conflict	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	470-82136 1 year ago	492-62838 1 year ago	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/)	t-category-theory RFC merge-conflict WIP	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	470-82136 1 year ago	626-20269 1 year ago	0-0 0 seconds
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/)	t-analysis merge-conflict awaiting-author	58/42	Mathlib/Analysis/NormedSpace/BoundedLinearMaps.lean	1	3	['github-actions', 'j-loreaux', 'urkud']	nobody	470-82136 1 year ago	578-9798 1 year 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/)	t-meta merge-conflict WIP	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	470-82136 1 year ago	532-19395 1 year ago	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/)	t-logic t-order merge-conflict	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	470-82136 1 year ago	492-62838 1 year ago	64-12826 64 days
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/)	t-meta merge-conflict awaiting-author	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	470-82135 1 year ago	673-6033 1 year ago	38-46649 38 days
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/)	t-analysis merge-conflict awaiting-author	540/0	Mathlib.lean,Mathlib/Analysis/Convex/ConvexFunction.lean	2	15	['github-actions', 'winstonyin']	nobody	470-82135 1 year ago	601-48824 1 year ago	22-72922 22 days
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/)	awaiting-CI merge-conflict please-adopt awaiting-author	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	470-82135 1 year ago	658-74379 1 year ago	0-0 0 seconds
9252	FR-vdash-bot author:FR-vdash-bot	chore: remove redundant covariance instances, add priority	I noticed that the following code is surprisingly slow. ``` lean import Mathlib count_heartbeats in example {n : ℕ} : CovariantClass (Fin (n + 1)) (Fin (n + 1)) (· + ·) (· < ·) := by try infer_instance sorry ``` This PR removed some redundant instances. The heartbeats have dropped from 19118 to 11450 (still too slow). Lean4 still seems to make some redundant attempts. See also https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict awaiting-author WIP 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	['FR-vdash-bot', 'leanprover-bot', 'urkud']	nobody	470-82135 1 year ago	529-39160 1 year ago	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/)	t-measure-probability t-algebra t-analysis merge-conflict WIP label:t-algebra$	97/0	Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean	1	7	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	470-82135 1 year ago	475-77204 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict 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	470-82135 1 year ago	504-70037 1 year ago	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/)	t-algebra merge-conflict WIP label:t-algebra$	41/14	Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/RingTheory/Norm.lean	2	0	[]	nobody	470-82135 1 year ago	559-56919 1 year ago	0-0 0 seconds
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/)	t-category-theory merge-conflict WIP	21/8	Mathlib/Algebra/Category/ModuleCat/Adjunctions.lean,Mathlib/CategoryTheory/Monoidal/Functorial.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean	3	0	[]	nobody	470-82135 1 year ago	658-85984 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict awaiting-author 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	470-82135 1 year ago	572-31864 1 year ago	0-0 0 seconds
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/)	t-algebra t-topology merge-conflict awaiting-author 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	470-82135 1 year ago	652-3863 1 year ago	7-6153 7 days
8585	thorimur author:thorimur	chore: bench lean4#2944	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1/1	lean-toolchain	1	2	['leanprover-bot', 'thorimur']	nobody	470-82135 1 year ago	722-913 1 year ago *	0-0 0 seconds *
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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	80/18	Mathlib/GroupTheory/Congruence.lean,Mathlib/RingTheory/Congruence.lean	2	6	['YaelDillies', 'eric-wieser']	nobody	470-82135 1 year ago	520-60789 1 year ago	29-65537 29 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/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	30/8	Mathlib/Algebra/FreeAlgebra.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	470-82135 1 year ago	492-62838 1 year ago	0-0 0 seconds
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	470-82135 1 year ago	721-68991 1 year ago	0-0 0 seconds
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/)	t-meta merge-conflict awaiting-author	24/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/TryAssumption.lean	4	5	['alexjbest', 'j-loreaux', 'jcommelin']	nobody	470-82135 1 year ago	654-16132 1 year ago	19-26304 19 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/)	t-algebra merge-conflict awaiting-author 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	470-82135 1 year ago	619-54450 1 year ago	5-6524 5 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/)	t-algebra merge-conflict WIP 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	470-82135 1 year ago	634-71852 1 year ago	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/)	t-algebra awaiting-CI merge-conflict WIP 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	470-82135 1 year ago	563-72341 1 year ago	0-0 0 seconds
9564	AntoineChambert-Loir author:AntoineChambert-Loir	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/)	t-algebra merge-conflict WIP 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	470-82135 1 year ago	492-62838 1 year ago	16-24540 16 days
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	t-analysis merge-conflict awaiting-author WIP help-wanted	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	470-82135 1 year ago	648-62037 1 year ago	0-0 0 seconds
7427	MohanadAhmed author:MohanadAhmed	Mohanad ahmed/sort eigenvalues abs	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	470-82134 1 year ago	648-22431 1 year ago	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/)	t-meta merge-conflict WIP	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	470-82134 1 year ago	673-63570 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	52/0	Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	1	3	['jcommelin', 'leanprover-community-mathlib4-bot', 'shuxuezhuyi']	jcommelin assignee:jcommelin	470-82134 1 year ago	491-35593 1 year ago	1-85757 1 day
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/)	t-algebra merge-conflict WIP label:t-algebra$	31/0	Mathlib/LinearAlgebra/Matrix/Spectrum.lean	1	0	[]	nobody	470-82134 1 year ago	482-60851 1 year ago	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	470-82134 1 year ago	587-70566 1 year ago	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	470-82134 1 year ago	664-61039 1 year ago	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/)	t-analysis merge-conflict help-wanted	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	470-82134 1 year ago	492-62838 1 year ago	0-0 0 seconds
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/)	t-measure-probability merge-conflict awaiting-author	53/1	Mathlib/MeasureTheory/Measure/MutuallySingular.lean,lean-toolchain	2	6	['RemyDegenne', 'digama0', 'eric-wieser', 'fpvandoorn']	nobody	470-82134 1 year ago	745-1574 2 years ago	0-62955 17 hours
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/)	t-topology t-meta merge-conflict WIP	14/9	Mathlib/Tactic/Continuity.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,test/Continuity.lean	3	2	['eric-wieser']	nobody	470-82134 1 year ago	746-22175 2 years ago	0-72515 20 hours
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/)	t-algebra merge-conflict WIP 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	470-82134 1 year ago	482-60723 1 year ago	0-0 0 seconds
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/)	awaiting-CI merge-conflict awaiting-author help-wanted	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	470-82134 1 year ago	787-49994 2 years ago	0-0 0 seconds
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/)	slow-typeclass-synthesis t-algebra merge-conflict 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	470-82134 1 year ago	492-62838 1 year ago	1-47913 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	470-82134 1 year ago	492-62838 1 year ago	35-56459 35 days
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/)	t-algebra awaiting-CI merge-conflict 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	470-82134 1 year ago	492-62838 1 year ago	0-0 0 seconds
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/)	t-algebra t-meta merge-conflict awaiting-author label:t-algebra$	257/48	Mathlib/Tactic/Ring/Basic.lean,test/linear_combination.lean,test/ring.lean	3	1	['eric-wieser']	nobody	470-82134 1 year ago	528-6726 1 year ago	0-0 0 seconds
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/)	t-analysis merge-conflict WIP	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	470-82134 1 year ago	632-31146 1 year ago	0-0 0 seconds
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/)	t-algebra awaiting-CI easy merge-conflict label:t-algebra$	9/33	Mathlib/LinearAlgebra/Basic.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	470-82134 1 year ago	492-62838 1 year ago	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/)	t-meta merge-conflict WIP	327/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ResynthInstances.lean,test/ResynthInstances.lean	4	0	[]	nobody	470-82134 1 year ago	801-56157 2 years ago	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/)	t-order merge-conflict awaiting-author	59/0	Mathlib.lean,Mathlib/Data/Set/Function.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	3	7	['j-loreaux', 'shuxuezhuyi']	nobody	470-82134 1 year ago	600-45400 1 year ago	30-30522 30 days
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/)	t-algebra t-analysis merge-conflict WIP 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	470-82133 1 year ago	821-85270 2 years ago	0-4269 1 hour
6268	eric-wieser author:eric-wieser	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	470-82133 1 year ago	697-27600 1 year ago	0-0 0 seconds
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/)	t-combinatorics merge-conflict awaiting-author	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	0	[]	nobody	470-82133 1 year ago	511-79561 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict WIP label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	470-82133 1 year ago	826-33997 2 years ago	0-0 0 seconds
6328	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` lower priority	Many similar instances have been marked as lower priority. I'd like to see if this would make things faster. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict WIP label:t-algebra$	14/14	Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/Subsemiring/Basic.lean,lean-toolchain	3	1	['digama0']	nobody	470-82133 1 year ago	745-2341 2 years ago	0-0 0 seconds
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/)	t-algebra merge-conflict label:t-algebra$	24/10	Mathlib/Algebra/Hom/GroupAction.lean	1	0	[]	nobody	470-82133 1 year ago	492-62838 1 year ago	83-76369 83 days
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 ``` --- - [ ] 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/)	t-algebra merge-conflict awaiting-author 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	4	['adomani', 'eric-wieser', 'leanprover-community-mathlib4-bot']	nobody	470-82133 1 year ago	817-43658 2 years ago	0-19160 5 hours
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.	t-measure-probability t-differential-geometry merge-conflict WIP	165/0	Mathlib.lean,Mathlib/Geometry/Manifold/MeasureZero.lean,docs/references.bib	3	27	['ADedecker', 'github-actions', 'grunweg', 'mo271', 'sgouezel']	ADedecker assignee:ADedecker	470-82133 1 year ago	509-77944 1 year ago	43-56043 43 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/)	t-category-theory merge-conflict awaiting-author	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	470-82133 1 year ago	486-8562 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict 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	470-82133 1 year ago	492-62838 1 year ago	102-21189 102 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/)	slow-typeclass-synthesis t-order t-algebra merge-conflict 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	470-82133 1 year ago	529-39203 1 year ago	13-18399 13 days
6330	FR-vdash-bot author:FR-vdash-bot	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/)	slow-typeclass-synthesis t-algebra merge-conflict WIP 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	['FR-vdash-bot', 'digama0', 'leanprover-bot']	nobody	470-82133 1 year ago	529-39223 1 year ago	0-0 0 seconds
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	470-82133 1 year ago	502-55728 1 year ago	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/)	t-meta merge-conflict	482/1	Mathlib/Tactic/Backtracking.lean,test/Backtracking.lean	2	0	[]	nobody	470-82133 1 year ago	793-15108 2 years ago	0-0 0 seconds
3808	kim-em author:kim-em	feat: #formalize, backed by a choice of LLMs	This replaces * https://github.com/leanprover-community/mathlib4/pull/3785, which has essentially been moved to an [independent repository](https://github.com/leanprover-community/llm) and generalised to interface with a choice of OpenAI's GPT, a gpt4all model (running locally via their python binding), or a model compatible with `llama.cpp` (e.g. the 4-bit quantised versions of Meta's LLaMa models). * https://github.com/leanprover-community/mathlib4/pull/3786, which has been modified slightly but still adds code here in `Mathlib.Tactic.Formalize`. Typical output: ``` #formalize "There are infinitely many primes numbers ending with a 7." ``` produces: * GPT4 ``` -- /-- There are infinitely many prime numbers ending with a 7. -/ -- theorem infinitely_many_primes_ending_with_7 : ∀ N : Nat, ∃ p, N < p ∧ p.Prime ∧ p % 10 = 7 := -- sorry ``` * ggml-gpt4all-j-v1.3-groovy.bin: ``` -- There are infinitely many prime numbers that end with a 7. ``` * 7B/ggml-model-q4_0.bin: ``` -- ∀ p : nat, 7 < 7p + 1 := sorry -– \end{code} ``` There are other sample outputs in `test/formalize.lean` If you don't currently have a LLM that the `leanprover-community/llm` project can recognise, when you run `#formalize` you get an error message, which currently reads: ``` Could not find a usable chat bot! You can try one of the following: * Obtain an OpenAI API access key at https://platform.openai.com/account/api-keys, and store it in the environment variable OPENAI_API_KEY. This will enable you to use ChatGPT. * Download the GPT4All-J model `https://gpt4all.io/models/ggml-gpt4all-j-v1.3-groovy.bin`, and put it in either `$HOME/.models/` or `$LLM_MODELS`. Also install the gpt4all python bindings via `pip3 install pygpt4all`. * Clone the `llama.cpp` repository from https://github.com/ggerganov/llama.cpp. Set the environment variable `LLAMA_CPP_HOME` to this repository. Follow the instructions in the README to produce `7B/ggml-model-q4_0.bin` starting from the Meta LLaMa weights. You can store this file at one of * `$LLAMA_CPP_HOME/models/7B/ggml-model-q4_0.bin` * `$HOME/.models/7B/ggml-model-q4_0.bin` * `$LLM_MODELS/7B/ggml-model-q4_0.bin` ``` Currently there are not user-configurable hooks to pick which LLM to use: it checks the conditions described in those bullet points, and takes the first one it finds. (i.e. if you want to use the LLaMa `7B/ggml-model-q4_0.bin`, you have to remove your OpenAI API key!). However a tactic in a downstream project (e.g. mathlib) can specify which interface and model it wants to use, or just call `findChatBot` for the behaviour described in that message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	180/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Formalize.lean,lake-manifest.json,lakefile.lean,test/formalize.lean	6	2	['digama0', 'jcommelin']	nobody	470-82133 1 year ago	790-85261 2 years ago	124-45187 124 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/)	t-algebra awaiting-CI merge-conflict 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	470-82133 1 year ago	492-62838 1 year ago	5-55287 5 days
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/)	t-meta merge-conflict WIP	148/0	Mathlib.lean,Mathlib/Lean/SubExpr.lean	2	0	[]	nobody	470-82133 1 year ago	891-7049 2 years ago	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/)	t-analysis merge-conflict awaiting-author	26/0	Mathlib/Analysis/SpecialFunctions/Gaussian.lean	1	3	['ocfnash', 'slerpyyy', 'urkud']	nobody	470-82133 1 year ago	735-71730 2 years ago	9-67365 9 days
6195	eric-wieser author:eric-wieser	chore(RingTheory/TensorProduct): golf the `mul` definition	--- - [x] depends on: #6211 - [x] depends on: #6187 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Strangely this causes a timeout downstream	t-algebra awaiting-CI merge-conflict label:t-algebra$	4/29	Mathlib/RingTheory/TensorProduct.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	470-82133 1 year ago	492-62838 1 year ago	0-0 0 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/)	t-analysis merge-conflict WIP	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	470-82133 1 year ago	821-49774 2 years ago	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	t-meta merge-conflict mathlib-port help-wanted	183/0	Mathlib.lean,Mathlib/Data/Rat/MetaDefs.lean,test/rat.lean	3	4	['eric-wieser', 'gebner']	nobody	470-82133 1 year ago	640-69122 1 year ago	0-0 0 seconds
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/)	awaiting-CI merge-conflict	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	470-82133 1 year ago	492-62838 1 year ago	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/)	awaiting-CI merge-conflict	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	0	[]	nobody	470-82133 1 year ago	492-62838 1 year ago	0-0 0 seconds
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/)	t-meta merge-conflict WIP	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	470-82132 1 year ago	723-6918 1 year ago	45-49113 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/)	t-meta merge-conflict WIP	131/32	Mathlib/Tactic/Conv.lean,Mathlib/Tactic/NormNum/Core.lean,Mathlib/Tactic/PushNeg.lean,docs/Conv/Guide.lean	4	0	[]	nobody	466-58442 1 year ago	466-58442 1 year ago	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/)	t-topology merge-conflict help-wanted	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	463-70111 1 year ago	463-70111 1 year ago	0-0 0 seconds
14994	kim-em author:kim-em	profiling: skipKernelTC		merge-conflict	2/1	lakefile.lean	1	3	['github-actions', 'kim-em', 'leanprover-bot']	nobody	462-15855 1 year ago	462-15855 1 year ago	0-0 0 seconds
15400	grunweg author:grunweg	feat: "confusing variables" linter	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 leanprover/lean4#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/)	t-linter merge-conflict WIP	292/47	Cache/Requests.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Prod.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/Adjoin.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/Minpoly/MinpolyDiv.lean,Mathlib/FieldTheory/Normal.lean,Mathlib/FieldTheory/PurelyInseparable.lean,Mathlib/Geometry/Manifold/BumpFunction.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,test/Lint.lean	22	1	['github-actions']	nobody	458-63205 1 year ago	464-13827 1 year ago	0-0 0 seconds
14654	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. --- Two CLI warts I'm unhappy about. - how can I have flag names with a hyphen? Currently, I have to write `--print_linters`, which is less pretty. - many options take an `Array String`: how can I pass this to the executable? This is not obvious to me... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter RFC 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	5	['github-actions', 'grunweg', 'rosborn']	nobody	458-40055 1 year ago	458-40055 1 year ago	13-61906 13 days
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	458-39287 1 year ago	458-39287 1 year ago	0-8 8 seconds
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/)	t-data merge-conflict	11/0	Mathlib/Data/List/Basic.lean	1	1	['eric-wieser']	nobody	456-75678 1 year ago	456-75678 1 year 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/)	t-data merge-conflict please-adopt	311/0	Mathlib.lean,Mathlib/Data/Polynomial/OfList.lean	2	0	[]	nobody	456-75211 1 year ago	456-75211 1 year ago	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/)	t-category-theory merge-conflict WIP	105/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Induced.lean	2	3	['eric-wieser', 'github-actions', 'joelriou']	nobody	456-73610 1 year ago	456-73610 1 year ago	0-0 0 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/)	t-linter merge-conflict 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	456-60374 1 year ago	456-60374 1 year ago	0-0 0 seconds
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)	t-algebra merge-conflict WIP label:t-algebra$	10/3	Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean	2	1	['github-actions']	nobody	455-72395 1 year ago	455-72395 1 year ago	0-0 0 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/)	t-topology merge-conflict	33/3	Mathlib/Topology/StoneCech.lean	1	2	['ADedecker', 'erdOne']	nobody	455-72192 1 year ago	455-72192 1 year ago	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/)	t-linter merge-conflict	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	455-72055 1 year ago	455-72055 1 year ago	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/)	t-analysis merge-conflict WIP	129/0	Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean	2	13	['github-actions']	nobody	455-72040 1 year ago	455-72040 1 year ago	0-0 0 seconds
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/)	t-topology merge-conflict WIP	274/130	Mathlib/Analysis/BoundedVariation.lean,Mathlib/MeasureTheory/Integral/FundThmCalculus.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Topology/Semicontinuous.lean	4	0	[]	nobody	455-72002 1 year ago	455-72002 1 year ago	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/)	t-meta merge-conflict	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	455-71978 1 year ago	455-71978 1 year ago	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/)	t-analysis merge-conflict WIP	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	455-71968 1 year ago	455-71968 1 year ago	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/)	t-number-theory merge-conflict help-wanted	27/0	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/RingTheory/IntegralClosure.lean	2	9	['erdOne', 'leanprover-bot', 'mattrobball', 'riccardobrasca', 'xroblot']	nobody	455-71887 1 year ago	455-71887 1 year ago	0-0 0 seconds
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/)	t-computability merge-conflict 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	455-71852 1 year ago	455-71852 1 year ago	5-62479 5 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/)	t-topology merge-conflict	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	455-71820 1 year ago	455-71820 1 year ago	0-0 0 seconds
10428	dwrensha author:dwrensha	feat: add simp_digits tactic	With the introduction of the simprocs `reduceLE`, `reduceMod`, `reduceDiv` etc. in Lean v4.6.0, now `simp` can fully normalize typical `Nat.digits` calls that have concrete arguments. The situation is still a bit delicate however, as we want to avoid invoking kernel reduction on `Nat.digits`, because the `Acc`-based ("well founded") recursion in `digitsAux` can get bogged down. This PR introduces a new tactic `simp_digits` tactic that contains only the simp lemmas and simprocs needed to reduce `Nat.digits`. This allows proofs involving `Nat.digits` to be cleanly factored into two steps: 1. reduce `Nat.digits` via `simp_digits`, 2. do things that require kernel reduction such as `simp_arith`, `decide`, or `rfl`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	6/124	Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Mathlib/Data/Nat/Digits.lean	3	2	['dwrensha']	nobody	455-71674 1 year ago	455-71674 1 year ago	0-0 0 seconds
8608	eric-wieser author:eric-wieser	feat: multiplicativize `AddTorsor`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP 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	0	[]	nobody	455-71497 1 year ago	455-71497 1 year ago	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/)	CI merge-conflict WIP	29/0	lakefile.lean	1	3	['kim-em', 'tydeu']	nobody	455-71439 1 year ago	455-71439 1 year ago	11-1960 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	t-analysis merge-conflict WIP	159/0	Mathlib.lean,Mathlib/Analysis/Convex/Cone/ConeLinearProgram.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	455-71384 1 year ago	455-71384 1 year ago	0-0 0 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/)	t-topology merge-conflict awaiting-author	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	455-71378 1 year ago	455-71378 1 year 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/)	t-meta merge-conflict	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	455-71246 1 year ago	455-71246 1 year ago	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/)	t-algebra merge-conflict 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	454-17254 1 year ago	454-17254 1 year ago	0-0 0 seconds
15585	FR-vdash-bot author:FR-vdash-bot	test make `HasQuotient.quotient'` reducible	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	8/1	Mathlib/Algebra/Quotient.lean,Mathlib/GroupTheory/Coset.lean	2	1	['github-actions']	nobody	454-17254 1 year ago	454-17254 1 year ago	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/)	tech debt t-computability merge-conflict	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	452-38523 1 year ago	492-62838 1 year ago	1-84718 1 day
11964	adamtopaz author:adamtopaz	feat: The functor of points of a scheme	We construct the functor of points functor, and prove that it's full and faithful. --- - [ ] depends on: #11947 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory merge-conflict	210/0	Mathlib.lean,Mathlib/AlgebraicGeometry/FunctorOfPoints.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean	3	4	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	452-38382 1 year ago	492-62838 1 year ago	0-1223 20 minutes
12418	rosborn author:rosborn	style: replace preimage_val with ↓∩ notation	--- This is a rough draft of what the new `↓∩` notation would look like within mathlib. I believe this is an improvement in clarity and would like to have `↓∩` as a standard notation (along with `''`, `⁻¹'`, `↑`, etc...). As `↓∩` is specialized for `Set`s, I have only changed `preimage_val` when the left-hand side of `↓∩` is a `Set`. The introduction of the `↓∩` notation to Data.Set.Image is temporary as it isn't possible to import Data.Set.Subset directly. If we want `↓∩` unscoped, where would be the best place to define it? An option is Data.Set.Defs, but the notation cannot be defined without additional imports as the file does not import `notation3`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	56/61	Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Set/Subset.lean,Mathlib/MeasureTheory/Constructions/Polish.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/Order/UpperLower/Basic.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/LocallyConstant/Basic.lean,Mathlib/Topology/Separation.lean,Mathlib/Topology/Sober.lean	18	3	['grunweg', 'rosborn']	nobody	452-38281 1 year ago	492-62838 1 year ago	29-14218 29 days
9978	FR-vdash-bot author:FR-vdash-bot	chore(FieldTheory/KummerExtension): move some lemmas earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author 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	452-38073 1 year ago	452-38073 1 year 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 t-meta merge-conflict awaiting-author 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	452-37384 1 year ago	452-37384 1 year ago	0-0 0 seconds
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/)	t-logic merge-conflict	55/13	Mathlib/ModelTheory/Algebra/Ring/FreeCommRing.lean,Mathlib/ModelTheory/Syntax.lean	2	1	['github-actions']	nobody	452-15947 1 year ago	452-15947 1 year ago	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/)	t-algebra merge-conflict 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	451-79471 1 year ago	451-83385 1 year ago	0-0 0 seconds
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/)	t-data new-contributor merge-conflict	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	451-59435 1 year ago	456-75677 1 year ago	54-52408 54 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/)	tech debt merge-conflict awaiting-author	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	451-48488 1 year ago	452-37635 1 year ago	7-18420 7 days
10349	Shamrock-Frost author:Shamrock-Frost	refactor(CategoryTheory/MorphismProperty)	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 - [ ] depends on: #10348 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	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	449-61718 1 year ago	492-62838 1 year ago	0-418 6 minutes
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/)	t-data merge-conflict	169/3	Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/Order/Closure.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	449-61709 1 year ago	456-75679 1 year ago	19-74514 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/)	t-algebra merge-conflict awaiting-author 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	449-61689 1 year ago	455-72284 1 year ago	39-72739 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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	294/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/DFT.lean	2	26	['MohanadAhmed', 'ericrbg']	nobody	449-61527 1 year ago	528-51117 1 year 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/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	565/12	Mathlib/NumberTheory/EllipticDivisibilitySequence.lean	1	55	['Multramate', 'alreadydone', 'github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	443-75131 1 year ago	443-75131 1 year 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/)	t-linter merge-conflict WIP	77/26	Mathlib/Tactic/Linter/HaveLetLinter.lean,test/HaveLetLinter.lean	2	1	['github-actions']	nobody	442-43407 1 year ago	442-43407 1 year ago	0-8 8 seconds
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/)	t-linter merge-conflict 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	440-66621 1 year ago	440-66622 1 year ago	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/)	t-linter merge-conflict	119/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/CheckAsSorry.lean,test/CheckAsSorry.lean	4	1	['github-actions']	nobody	440-65609 1 year ago	440-65609 1 year ago	0-0 0 seconds
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	436-59123 1 year ago	436-59123 1 year ago	0-0 0 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	436-59123 1 year ago	436-59123 1 year ago	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/)	t-category-theory t-meta merge-conflict	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	431-53867 1 year ago	431-53870 1 year ago	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/)	t-category-theory t-meta merge-conflict	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	n/a	['github-actions']	nobody	431-14004 1 year ago	unknown	unknown
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/)	t-algebra RFC merge-conflict 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	429-78760 1 year ago	429-78760 1 year ago	0-0 0 seconds
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/)	t-logic merge-conflict awaiting-author	50/0	Mathlib.lean,Mathlib/Logic/Function/ApiForExtend.lean	2	1	['fpvandoorn']	nobody	429-7896 1 year ago	429-7896 1 year ago	32-30254 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/)	test-ci merge-conflict awaiting-author WIP	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	425-36829 1 year ago	425-36829 1 year ago	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/)	CI merge-conflict awaiting-author	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	425-17129 1 year ago	425-17129 1 year ago	0-0 0 seconds
11800	JADekker author:JADekker	feat : Define 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/)	awaiting-zulip t-topology merge-conflict please-adopt	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	424-7906 1 year ago	424-29881 1 year ago	119-10687 119 days
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/)	t-logic merge-conflict WIP	8/0	Mathlib/ModelTheory/Satisfiability.lean	1	2	['fpvandoorn', 'hmonroe']	nobody	422-74083 1 year ago	422-74083 1 year ago	3-5240 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	420-62692 1 year ago	420-62692 1 year ago	0-14835 4 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. --- - [ ] depends on: #10653 - [x] depends on: #10994 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict modifies-tactic-syntax WIP	392/124	Mathlib/Tactic/TFAE.lean,scripts/noshake.json,test/tfae.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	419-86346 1 year ago	419-86346 1 year ago	0-0 0 seconds
16464	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Nat.(case_)strong_induction_on`	…in favour of the now-renamed `Nat.(case)strongInductionOn` in core.	tech debt merge-conflict	54/56	Archive/Imo/Imo1981Q3.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Hofer.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Computability/Primrec.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Log.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/NumberTheory/BernoulliPolynomials.lean,Mathlib/NumberTheory/DiophantineApproximation.lean,Mathlib/NumberTheory/Pell.lean,Mathlib/NumberTheory/Primorial.lean,Mathlib/Order/Fin/Basic.lean,Mathlib/RingTheory/Adjoin/PowerBasis.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Eisenstein/IsIntegral.lean,Mathlib/RingTheory/Polynomial/Nilpotent.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/QuotientNilpotent.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Metrizable/Uniformity.lean	43	13	['Parcly-Taxel', 'b-mehta', 'github-actions', 'jcommelin']	nobody	419-47991 1 year ago	419-47991 1 year ago	8-1989 8 days
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/)	t-category-theory merge-conflict awaiting-author	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	415-84978 1 year ago	415-84979 1 year ago	21-9462 21 days
17171	FR-vdash-bot author:FR-vdash-bot	test extends carrier and property	--- We need https://github.com/leanprover/lean4/issues/2666 ... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	433/309	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/Field/Subfield.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/MulOpposite.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/MulOpposite.lean,Mathlib/Algebra/Ring/Subsemiring/Order.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Algebra/Star/Subsemiring.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Deprecated/Subfield.lean,Mathlib/Deprecated/Subgroup.lean,Mathlib/Deprecated/Submonoid.lean,Mathlib/Deprecated/Subring.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/DoubleCoset.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/SetTheory/Cardinal/Subfield.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean	42	1	['github-actions']	nobody	411-43671 1 year ago	411-43671 1 year ago	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	410-15331 1 year ago	410-15331 1 year ago	0-0 0 seconds
17127	FR-vdash-bot author:FR-vdash-bot	chore: remove global `Quotient.mk` `⟦·⟧` notation	--- Merge this PR when we are ready to migrate to `QuotLike` API (#16421). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	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	410-10374 1 year ago	410-10374 1 year ago	4-72805 4 days
14712	FR-vdash-bot author:FR-vdash-bot	perf: change instance priority and order about `OfNat`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict delegated 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	24	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'mathlib-bors']	nobody	403-73327 1 year ago	406-10403 1 year ago	20-15089 20 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/)	t-topology merge-conflict awaiting-author	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	14	['ADedecker', 'grunweg', 'j-loreaux', 'kkytola', 'mathlib-bors', 'mcdoll']	nobody	402-8870 1 year ago	402-8870 1 year ago	46-5572 46 days
5995	FR-vdash-bot author:FR-vdash-bot	feat: add APIs about `Quotient.choice`	Some docs in this PR refer to the definition in #5576. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC merge-conflict awaiting-author	76/6	Mathlib/Data/Quot.lean	1	3	['FR-vdash-bot', 'YaelDillies', 'gebner']	eric-wieser assignee:eric-wieser	400-55516 1 year ago	400-55516 1 year ago	285-35716 285 days
8029	alreadydone author:alreadydone	refactor: Homotopy between Functions not ContinuousMaps	This allows talking about homotopies without needing to supply proofs of continuity for the two ends. This for example simplifies the definition of H-spaces. Of course, if a homotopy exists between two functions, those two functions are automatically continuous because they are restrictions of the homotopy (which is continuous) to subspaces. `Homotopy.refl` still needs a continuous map as input, and `Homotopic` is only an equivalence relation when restricted to ContinuousMap. --- TODO: fix docstrings [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology RFC merge-conflict	246/250	Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/Equiv.lean,Mathlib/Topology/Homotopy/HSpaces.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Homotopy/Product.lean	8	3	['alreadydone', 'urkud']	nobody	400-39179 1 year ago	492-62838 1 year ago	9-20043 9 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/)	new-contributor merge-conflict WIP	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	398-1457 1 year ago	482-59601 1 year ago	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/)	t-algebra merge-conflict 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	395-62656 1 year ago	395-62656 1 year ago	51-84473 51 days
16348	urkud author:urkud	refactor(Topology): require `LinearOrder` with `OrderTopology`	While the definition formally makes sense for a preorder, this topology is usually not the right one for a non-linear order (e.g., `Real × Real`). See [Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Open.20Ioi) --- This PR doesn't cleanup any API, I'm going to do it in a later PR. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology merge-conflict awaiting-author	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	395-62280 1 year ago	395-62280 1 year ago	3-83049 3 days
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/)	t-meta merge-conflict	158/35	Mathlib/Tactic/Module.lean,test/module.lean	2	1	['github-actions']	nobody	391-84720 1 year ago	391-84720 1 year ago	0-0 0 seconds
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	387-60505 1 year ago	387-60505 1 year ago	0-0 0 seconds
16925	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Cofinality): aleph index of singular cardinal has infinite cofinality	Prove `Ordinal.aleph0_le_cof_of_not_isRegular`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	6/0	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	4	['YnirPaz', 'github-actions', 'vihdzp']	nobody	386-32087 1 year ago	386-32087 1 year ago	2-57220 2 days
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/)	t-data t-combinatorics merge-conflict	311/0	Mathlib.lean,Mathlib/Data/List/Partition.lean	2	1	['github-actions']	nobody	384-80979 1 year ago	384-80979 1 year ago	0-0 0 seconds
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.	t-data new-contributor merge-conflict please-adopt 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', 'leanprover-community-mathlib4-bot', 'urkud', 'vihdzp']	YaelDillies assignee:YaelDillies	379-35274 1 year ago	406-4065 1 year ago	12-48560 12 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/)	t-meta merge-conflict	125/18	Mathlib/Tactic/WLOG.lean,test/wlog.lean	2	2	['thorimur', 'urkud']	nobody	375-21931 1 year ago	375-21931 1 year ago	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/)	t-meta merge-conflict awaiting-author	63/9	Mathlib/Lean/Meta.lean,Mathlib/Tactic/MkIffOfInductiveProp.lean,test/MkIffOfInductive.lean	3	6	['Vierkantor', 'github-actions', 'urkud']	nobody	375-21685 1 year ago	375-21685 1 year ago	25-70815 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/)	t-order merge-conflict WIP	324/0	Mathlib.lean,Mathlib/Data/Ordering/Dickson.lean,scripts/noshake.json	3	9	['AntoineChambert-Loir', 'b-mehta', 'github-actions']	nobody	375-242 1 year ago	375-242 1 year 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/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	12/0	Mathlib/Algebra/Ring/Int.lean,Mathlib/Algebra/Ring/Parity.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'urkud']	nobody	374-34439 1 year ago	374-34439 1 year ago	0-57608 16 hours
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 awaiting-author WIP	340/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml	4	11	['alexjbest', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'urkud']	nobody	374-25193 1 year ago	374-25207 1 year ago	0-0 0 seconds
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/)	t-algebra merge-conflict WIP 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	373-60652 1 year ago	492-62838 1 year ago	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/)	new-contributor t-order t-algebra merge-conflict 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	373-5840 1 year ago	373-5840 1 year ago	7-45599 7 days
12778	MichaelStollBayreuth author:MichaelStollBayreuth	perf: decouple algebraic and order hierarchies in type class search	Based on the experience gained with [#12680](https://github.com/leanprover-community/mathlib4/pull/12680), this attempts to decouple the algebraic and order hierarchies in type class search. * We lower the priorities of instances like `OrderedSemiring.toSemiring` (which are generated by the `extends` clause with default priority 1000) to 50. * Additionally, we make the default priority available via `open scoped AlgebraOrderInstances` and use that where appropriate. Motivation: Looking at instance synthesization traces, it appears that when (e.g.) presented with the goal to find a `Semiring` instance, the algorithm frequently goes down a rabbit hole trying and failing to find order instances. This seems to be caused by the presence of instances like `OrderedSemiring.toSemiring` with default priority, which are tried early in the search, but lead nowhere (after a fairly long time). These instances are created by declarations of the form ```lean class OrderedSemiring (α : Type u) extends Semiring α, OrderedAddCommMonoid α where ... ``` which automatically sets up (among other things) an instance `OrderedSemiring.toSemiring` with default piority. It appears that these instances cannot be removed completely (only locally in a module), so the next best solution is to make them low priority (which is possible also for downstream modules). To provide for situations where these instances are desired, we put a default priority version in the scope `AlgebraOrderInstances`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-order t-algebra merge-conflict label:t-algebra$	306/27	Mathlib/Algebra/Algebra/Subalgebra/Order.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/Submodule/Order.lean,Mathlib/Algebra/Order/AbsoluteValue.lean,Mathlib/Algebra/Order/Algebra.lean,Mathlib/Algebra/Order/Antidiag/Prod.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/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/List.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Field/Pi.lean,Mathlib/Algebra/Order/Floor.lean,Mathlib/Algebra/Order/Floor/Div.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Interval/Basic.lean,Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/Algebra/Order/Invertible.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Algebra.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Pointwise.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/Nonneg/Field.lean,Mathlib/Algebra/Order/Nonneg/Ring.lean,Mathlib/Algebra/Order/Pi.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Positive/Ring.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean,Mathlib/Algebra/Order/Ring/Pow.lean,Mathlib/Algebra/Order/Sub/WithTop.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/BoundedVariation.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Convex/Extrema.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/GaugeRescale.lean,Mathlib/Analysis/Convex/Hull.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SpecificFunctions/Pow.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/InnerProductSpace/Orientation.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Polynomials.lean,Mathlib/Analysis/SpecificLimits/FloorPow.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Combinatorics/Pigeonhole.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/DFinsupp/Multiset.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/MulAntidiagonal.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Nat/Cast/Field.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Choose/Bounds.lean,Mathlib/Data/PNat/Factors.lean,Mathlib/Data/Rat/Denumerable.lean,Mathlib/Data/Set/Pointwise/Interval.lean	135	34	['MichaelStollBayreuth', 'YaelDillies', 'github-actions', 'leanprover-bot']	nobody	373-4743 1 year ago	373-4743 1 year ago	18-19513 18 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/)	CI merge-conflict	147/0	.github/workflows/latest_import.yml,lakefile.lean	2	1	['github-actions']	nobody	371-79511 1 year ago	371-79511 1 year ago	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/)	new-contributor t-logic merge-conflict awaiting-author	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	370-48361 1 year ago	370-48361 1 year ago	0-19926 5 hours
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/)	t-differential-geometry merge-conflict awaiting-author	45/0	Mathlib/Geometry/Manifold/IntegralCurve.lean,Mathlib/Topology/Algebra/Module/Basic.lean	2	n/a	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot', 'winstonyin']	nobody	367-13784 1 year ago	unknown	unknown
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)	new-contributor t-logic merge-conflict awaiting-author	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	366-793 1 year ago	unknown	unknown
17675	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchy when searching `FunLike` hierarchy	--- Unification is still very slow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	365-62326 1 year ago	365-62326 1 year ago	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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	4/0	Mathlib/RingTheory/Finiteness.lean	1	4	['alreadydone', 'erdOne', 'leanprover-bot']	nobody	364-71586 11 months ago	364-71586 11 months ago	0-0 0 seconds
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/)	t-order t-topology merge-conflict awaiting-author	34/14	Mathlib/Topology/Constructions.lean,Mathlib/Topology/Order/LowerUpperTopology.lean	2	13	['Ruben-VandeVelde', 'TwoFX', 'github-actions', 'jcommelin', 'mans0954', 'mathlib-bors', 'riccardobrasca']	nobody	363-81340 11 months ago	363-81340 11 months ago	63-69206 63 days
16637	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` of `(Add)Monoid`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	363-80578 11 months ago	363-80578 11 months ago	1-49655 1 day
18765	FR-vdash-bot author:FR-vdash-bot	chore: changing `outParam` of `MulActionSemiHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	363-36839 11 months ago	363-36839 11 months ago	0-0 0 seconds
14739	urkud author:urkud	feat(Measure): add `gcongr` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author WIP help-wanted	12/8	Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/Probability/Kernel/Disintegration/Density.lean	5	3	['github-actions', 'kim-em', 'urkud']	nobody	362-80274 11 months ago	362-80274 11 months ago	0-66587 18 hours
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/)	t-combinatorics merge-conflict	159/0	Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean	1	1	['github-actions']	nobody	360-62032 11 months ago	360-62032 11 months ago	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/)	t-category-theory merge-conflict WIP	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	360-57560 11 months ago	653-80033 1 year ago	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	360-39203 11 months ago	360-39203 11 months ago	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/)	t-topology merge-conflict awaiting-author	94/0	Mathlib.lean,Mathlib/Topology/UniformSpace/UniformOrder.lean,docs/references.bib	3	2	['shuxuezhuyi']	nobody	359-44214 11 months ago	359-44214 11 months ago	10-33091 10 days
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order t-algebra merge-conflict label:t-algebra$	146/44	Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	2	11	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'j-loreaux']	nobody	358-67556 11 months ago	358-67556 11 months ago	33-64877 33 days
18969	alreadydone author:alreadydone	chore: generalize Module to NonUnitalSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP 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	357-4808 11 months ago	357-4808 11 months ago	0-0 0 seconds
17513	FR-vdash-bot author:FR-vdash-bot	perf: do not search algebraic hierarchies when using `map_*` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-algebra merge-conflict WIP label:t-algebra$	5/3	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	2	10	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	353-63750 11 months ago	353-63750 11 months ago	4-72589 4 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/)	t-algebra merge-conflict label:t-algebra$	25/0	Mathlib.lean,Mathlib/LinearAlgebra/VectorSpace.lean,scripts/noshake.json	3	10	['Julian', 'PieterCuijpers', 'github-actions', 'urkud']	nobody	352-68995 11 months ago	352-68995 11 months ago	7-68492 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/)	t-data merge-conflict	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	350-45072 11 months ago	350-45072 11 months ago	4-60621 4 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/)	t-topology merge-conflict WIP	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']	YaelDillies assignee:YaelDillies	346-72419 11 months ago	455-71609 1 year ago	0-0 0 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/)	workshop-AIM-AG-2024 t-algebra 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	48	['YaelDillies', 'adamtopaz', 'erdOne', 'github-actions', 'jjaassoonn', 'joelriou', 'kbuzzard', 'leanprover-community-mathlib4-bot']	joelriou assignee:joelriou	343-76077 11 months ago	343-76077 11 months ago	64-29952 64 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/)	t-algebra merge-conflict 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	339-10741 11 months ago	339-10741 11 months ago	31-75259 31 days
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/)	t-algebra merge-conflict WIP label:t-algebra$	111/0	Mathlib.lean,Mathlib/LinearAlgebra/RootSystem/Separation.lean	2	1	['github-actions']	nobody	339-642 11 months ago	339-642 11 months ago	20-56416 20 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/)	new-contributor t-algebra merge-conflict 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	336-23210 11 months ago	342-58633 11 months ago	0-4534 1 hour
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	334-70536 10 months ago	334-70536 10 months ago	3-30853 3 days
18748	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `ContinuousLinearMapClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology merge-conflict label:t-algebra$	115/49	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/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/Homeomorph.lean	10	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	332-61154 10 months ago	332-61157 10 months ago	0-989 16 minutes
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/)	t-logic merge-conflict awaiting-author	468/1	Mathlib.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/ProofTheory/LogicSymbol.lean	3	19	['PatrickMassot', 'YaelDillies', 'avigad', 'fpvandoorn', 'github-actions']	nobody	328-80356 10 months ago	328-80356 10 months ago	92-18232 92 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	328-80355 10 months ago	328-80355 10 months ago	0-0 0 seconds
18294	FR-vdash-bot author:FR-vdash-bot	perf: make `Mul.toSMul` higher priority	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-algebra merge-conflict 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	323-61548 10 months ago	323-61549 10 months ago	0-0 0 seconds
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/)	t-order merge-conflict awaiting-author	231/0	Mathlib.lean,Mathlib/Algebra/Order/EFloor.lean,Mathlib/Data/ENat/Basic.lean	3	5	['YaelDillies', 'github-actions', 'kkytola', 'urkud']	nobody	315-34722 10 months ago	315-34722 10 months 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/)	t-meta merge-conflict awaiting-author WIP	82/0	Mathlib.lean,Mathlib/Tactic/DeriveLinearOrder.lean	2	5	['ChrisHughes24', 'kim-em', 'kmill', 'vihdzp']	nobody	313-9375 10 months ago	313-9375 10 months ago	1-80342 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/)	t-meta merge-conflict awaiting-author	517/0	Mathlib.lean,Mathlib/Tactic/DeriveInfinite.lean,test/DeriveInfinite.lean	3	11	['TimothyGu', 'digama0', 'eric-wieser', 'grunweg', 'kim-em', 'kmill']	kmill assignee:kmill	313-9374 10 months ago	313-9374 10 months ago	8-36622 8 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/)	t-logic t-algebra RFC merge-conflict label:t-algebra$	34/13	Mathlib/ModelTheory/Algebra/Ring/Basic.lean	1	10	['ChrisHughes24', 'YaelDillies', 'awainverse', 'github-actions', 'jcommelin']	nobody	311-26915 10 months ago	311-26915 10 months 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/)	t-topology merge-conflict	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	304-57947 10 months ago	304-57947 10 months 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/)	new-contributor t-topology merge-conflict awaiting-author	27/0	Mathlib/Topology/Order/DenselyOrdered.lean	1	8	['github-actions', 'vihdzp']	nobody	302-45222 9 months ago	302-45222 9 months ago	0-4704 1 hour
18474	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `WithOne.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	9/2	Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean	3	7	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	302-44977 9 months ago	302-44977 9 months 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/)	t-differential-geometry merge-conflict please-adopt	246/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/VectorBundle/Sphere.lean	3	1	['github-actions']	nobody	301-79911 9 months ago	301-79911 9 months ago	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	new-contributor t-combinatorics merge-conflict awaiting-author	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	301-64308 9 months ago	301-64308 9 months 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/)	t-computability new-contributor merge-conflict awaiting-author	186/0	Mathlib.lean,Mathlib/Computability/Timed/InsertionSort.lean,Mathlib/Computability/Timed/Merge.lean	3	2	['github-actions', 'trivial1711']	nobody	301-30227 9 months ago	301-30227 9 months ago	33-11262 33 days
8362	urkud author:urkud	feat(Asymptotics): define `ReflectsGrowth`	--- - [x] depends on: #8349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	268/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/ReflectsGrowth.lean	2	14	['YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	299-37481 9 months ago	299-37481 9 months ago	1-41158 1 day
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/)	t-topology merge-conflict awaiting-author	126/0	Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Topology/PartialHomeomorph.lean	2	4	['alreadydone', 'github-actions', 'winstonyin']	nobody	299-22077 9 months ago	299-22077 9 months ago	117-22351 117 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/)	new-contributor t-algebra merge-conflict awaiting-author 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	296-51886 9 months ago	296-51887 9 months ago	36-2255 36 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	294-81097 9 months ago	294-81097 9 months 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/)	new-contributor t-measure-probability merge-conflict	203/40	Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/LpSpace.lean	2	1	['github-actions']	nobody	289-69234 9 months ago	289-69234 9 months ago	27-43617 27 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/)	new-contributor t-measure-probability merge-conflict awaiting-author	49/0	Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean	4	30	['EtienneC30', 'arulandu', 'github-actions', 'loefflerd']	nobody	288-43667 9 months ago	288-43667 9 months ago	9-73631 9 days
20872	grunweg author:grunweg	feat: lint against the tactic.skipAssignedInstances option in mathlib	This means we can remove the corresponding technical debt entry. We also correct some outdated details in the Linter/Style.lean docstring. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-linter merge-conflict awaiting-author	63/7	Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/Separation/Regular.lean,MathlibTest/LintStyle.lean,scripts/technical-debt-metrics.sh	5	17	['adomani', 'github-actions', 'grunweg']	nobody	288-37697 9 months ago	288-37697 9 months ago	0-9411 2 hours
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/)	t-meta merge-conflict awaiting-author	12/1	Mathlib/Tactic/Linarith/Preprocessing.lean	1	3	['Vierkantor', 'harahu', 'kim-em', 'mo271']	nobody	287-59827 9 months ago	722-33114 1 year ago	4-7271 4 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/)	t-algebra t-topology merge-conflict WIP help-wanted 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	287-37332 9 months ago	287-37332 9 months ago	101-64856 101 days
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/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict please-adopt WIP	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	282-84158 9 months ago	282-84158 9 months ago	0-201 3 minutes
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/)	t-computability merge-conflict awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	282-2011 9 months ago	282-2011 9 months ago	14-19968 14 days
18719	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `SemilinearMapClass.toAddHomClass`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra merge-conflict label:t-algebra$	14/7	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,MathlibTest/TCSynth.lean	3	4	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	280-63228 9 months ago	280-63228 9 months ago	0-0 0 seconds
20663	EtienneC30 author:EtienneC30	feat: `PFunLike` typeclass for partial homomorphisms and `LinearPMapClass`	A test PR implementing a typeclass `PFunLike` to represent partial homomorphisms and building a `LinearPMapClass` typeclass. Started from [this](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/ContinuousLinearPMap) discussion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-algebra merge-conflict WIP label:t-algebra$	278/49	Mathlib.lean,Mathlib/Algebra/Group/PHom.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Analysis/Convex/Cone/Extension.lean,Mathlib/Data/PFunLike.lean,Mathlib/GroupTheory/GroupAction/PHom.lean,Mathlib/LinearAlgebra/LinearPMap.lean	7	1	['github-actions']	nobody	279-55676 9 months ago	279-55676 9 months ago	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/)	t-data merge-conflict awaiting-author	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	279-44429 9 months ago	279-44429 9 months 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	278-43550 9 months ago	278-43550 9 months ago	0-7781 2 hours
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	276-62435 9 months ago	277-50798 9 months ago *	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	276-62434 9 months ago	277-50754 9 months ago *	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	276-62433 9 months ago	277-50635 9 months ago *	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/)	t-topology merge-conflict awaiting-author	332/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/CompletelyRegular.lean	3	6	['ADedecker', 'adri326']	ADedecker assignee:ADedecker	276-37961 9 months ago	276-37961 9 months ago	17-44773 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/)	t-category-theory t-meta merge-conflict awaiting-author	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	274-54471 9 months ago	274-54471 9 months ago	52-4682 52 days
15942	grunweg author:grunweg	chore: move style linters into their own file; document all current linters	Just to show the overall direction: this PR is just a tracking PR; it is easier to re-do the remaining pieces individually. - [x] depends on: #19529 (and needs a merge afterwards) --- The documenting of items should move into Tactic.Linter... [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	634/287	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Init.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/AdmitLinter.lean,Mathlib/Tactic/Linter/GlobalAttributeIn.lean,Mathlib/Tactic/Linter/HashCommandLinter.lean,Mathlib/Tactic/Linter/HaveLetLinter.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/OldObtain.lean,Mathlib/Tactic/Linter/RefineLinter.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/Linter/UnusedTactic.lean,Mathlib/Util/SleepHeartbeats.lean,lakefile.lean,test/AdmitLinter.lean,test/Change.lean,test/Check.lean,test/Clear!.lean,test/ClearExcept.lean,test/Clear_.lean,test/DefEqTransformations.lean,test/DeriveToExpr.lean,test/ExtractGoal.lean,test/ExtractLets.lean,test/GuardGoalNums.lean,test/GuardHypNums.lean,test/HashCommandLinter.lean,test/Lint.lean,test/LintStyle.lean,test/MfldSetTac.lean,test/MinImports.lean,test/SimpRw.lean,test/SplitIfs.lean,test/TermBeta.lean,test/TypeCheck.lean,test/UnsetOption.lean,test/Use.lean,test/basicTactics.lean,test/casesm.lean,test/convert.lean,test/fail_if_no_progress.lean,test/fun_prop_dev.lean,test/itauto.lean,test/meta.lean,test/notation3.lean,test/recover.lean,test/says.lean,test/symm.lean,test/trace.lean,test/trans.lean	54	5	['github-actions', 'grunweg', 'joneugster', 'mathlib4-dependent-issues-bot']	nobody	272-81095 8 months ago	272-81095 8 months ago	0-36287 10 hours
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/)	t-computability merge-conflict WIP	72/0	Mathlib.lean,Mathlib/Computability/Chomsky.lean,Mathlib/Computability/ContextFreeGrammar.lean	3	7	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'madvorak']	nobody	272-60890 8 months ago	272-60890 8 months ago	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/)	t-computability new-contributor merge-conflict awaiting-author	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	272-60643 8 months ago	272-60643 8 months ago	37-29014 37 days
17005	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Regular): define singular cardinals	Define singular cardinals and prove basic lemmas about them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	94/1	Mathlib.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/Basic.lean	3	28	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	270-7599 8 months ago	346-781 11 months ago	34-18388 34 days
18952	Command-Master author:Command-Master	chore: deprecate `Trunc`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	283/57	Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Preadditive/Biproducts.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Option.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/LinearAlgebra/Determinant.lean,Mathlib/Logic/Equiv/List.lean	12	8	['eric-wieser', 'github-actions', 'vihdzp']	nobody	269-45216 8 months ago	269-45216 8 months ago	0-0 0 seconds
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/)	t-meta merge-conflict awaiting-author	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	267-17071 8 months ago	267-17071 8 months ago	45-6057 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/)	t-meta merge-conflict modifies-tactic-syntax awaiting-author	181/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Prune.lean,test/Prune.lean	4	5	['adomani', 'j-loreaux', 'kmill']	nobody	266-70778 8 months ago	266-70778 8 months ago	195-56460 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	265-36442 8 months ago	265-48496 8 months ago *	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/)	carleson t-measure-probability merge-conflict awaiting-author	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	265-35631 8 months ago	267-69115 8 months ago	2-42743 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	264-44315 8 months ago	265-48059 8 months ago *	0-0 0 seconds *
21099	chrisflav author:chrisflav	chore(RingTheory/Generators): use unification hints for variables and relations	When working with generators and presentations, we rely on the `MvPolynomial` API, but since the type of variables is bundled in `Generators R S`, many lemmas don't apply with `rw` or `simp`, because they can't see through the definition of `vars` in constructions such as `Generators.comp` and `Generators.localizationAway`. A possible approach is to make all of these constructions `abbrev`s, but this causes `simp` to also unfold `val` which is not always desirable. More generally, it is then harder to predict how instance search and `simp` behave. This approach is tried in #21050, but causes many regressions. This approach is less invasive, as it uses `unif_hint` to unify the `vars` (and `rels`) fields of constructions with the correct type. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	231/91	Mathlib/Algebra/Module/Presentation/Differentials.lean,Mathlib/RingTheory/Generators.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	5	16	['chrisflav', 'erdOne', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	263-52212 8 months ago	263-52212 8 months ago	27-75210 27 days
21269	CharredLee author:CharredLee	(WIP) feat (CategoryTheory/Topos): Add topos theory content	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/)	new-contributor t-category-theory merge-conflict awaiting-author WIP	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	['CharredLee', 'gio256', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	262-26915 8 months ago	262-26915 8 months ago	0-13879 3 hours
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/)	t-measure-probability merge-conflict please-adopt awaiting-author	503/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Tight.lean	2	34	['EtienneC30', 'JADekker', 'github-actions', 'sgouezel']	nobody	261-55808 8 months ago	261-55808 8 months ago	2-604 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/)	t-analysis merge-conflict	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	260-82211 8 months ago	260-82211 8 months ago	12-11675 12 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	260-56944 8 months ago	277-51008 9 months ago *	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	260-55308 8 months ago	277-50872 9 months ago *	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/)	t-logic merge-conflict awaiting-author	97/43	Mathlib/ModelTheory/LanguageMap.lean,Mathlib/ModelTheory/Order.lean	2	9	['YaelDillies', 'awainverse', 'github-actions']	nobody	260-34679 8 months ago	260-34680 8 months ago	0-61590 17 hours
13686	fpvandoorn author:fpvandoorn	feat: some finset lemmas	* From the Sobolev inequality project * The increase in imports in `Mathlib.Data.Finset.Update` is not problematic: it is only imported in MeasureTheory files. Co-authored-by: Heather Macbeth 25316162+hrmacbeth@users.noreply.github.com --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	69/7	Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Update.lean	3	7	['YaelDillies', 'fpvandoorn', 'github-actions', 'urkud']	nobody	259-34310 8 months ago	259-34310 8 months ago	98-49006 98 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) ```	new-contributor t-algebra t-category-theory merge-conflict label:t-algebra$	47/8	Mathlib/RepresentationTheory/FDRep.lean	1	19	['github-actions', 'grhkm21', 'joelriou', 'kim-em', 'mathlib-bors']	nobody	258-69241 8 months ago	258-69241 8 months ago	125-12755 125 days
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/)	new-contributor t-algebra merge-conflict awaiting-author label:t-algebra$	91/0	Mathlib.lean,Mathlib/GroupTheory/SpecificGroups/BraidGroup/Basic.lean	2	22	['github-actions', 'hannahfechtner', 'jcommelin', 'joelriou']	nobody	257-53552 8 months ago	257-53552 8 months ago	15-40648 15 days
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/)	t-data merge-conflict awaiting-author	66/0	Mathlib.lean,Mathlib/Data/TypeFun.lean	2	9	['YaelDillies', 'alexkeizer', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	257-47272 8 months ago	unknown	unknown
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 t-analysis t-topology merge-conflict awaiting-author 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	255-70362 8 months ago	255-70362 8 months ago	0-0 0 seconds
21684	mattrobball author:mattrobball	draft		merge-conflict	13/11	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain	7	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	255-63932 8 months ago	255-63932 8 months ago	0-0 0 seconds
21722	mattrobball author:mattrobball	test		merge-conflict	76/23	Mathlib/CategoryTheory/Category/Cat/AsSmall.lean,Mathlib/CategoryTheory/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Closed/Types.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Topology/Category/LightProfinite/Basic.lean,lean-toolchain,scratch.lean	9	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	255-63931 8 months ago	255-63931 8 months ago	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/)	dependency-bump merge-conflict	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	255-58766 8 months ago	255-58766 8 months ago	0-0 0 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/)	new-contributor t-topology merge-conflict	285/1	Mathlib.lean,Mathlib/Topology/ContinuousMap/MvPolynomial.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	3	1	['github-actions']	nobody	253-55255 8 months ago	253-55255 8 months 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/)	large-import merge-conflict	126/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/FindDefEqAbuse.lean,MathlibTest/FindDefEqAbuse.lean	5	1	['github-actions']	nobody	251-57268 8 months ago	251-57268 8 months ago	0-0 0 seconds
20750	adomani author:adomani	feat: the envLinter syntax linter	The `envLinter` syntax linter emits a warning at the end of a file if `#lint` reports an error. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	69/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/EnvLinter.lean,MathlibTest/EnvLinter.lean	5	15	['adomani', 'github-actions', 'grunweg']	nobody	251-57022 8 months ago	251-57022 8 months ago	51-71438 51 days
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/)	large-import t-linter merge-conflict WIP	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	251-56187 8 months ago	251-56187 8 months ago	0-0 0 seconds
18470	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Normed.to` instances	--- From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict label:t-algebra$	28/0	Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean	2	9	['FR-vdash-bot', 'github-actions', 'jcommelin', 'leanprover-bot']	nobody	249-26682 8 months ago	249-26682 8 months ago	130-5197 130 days
16944	YnirPaz author:YnirPaz	feat(SetTheory/Cardinal/Cofinality): lemmas about limit ordinals and cofinality	Prove that a singular cardinal has a limit aleph index and that a limit ordinal and positive cofinality. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	18/0	Mathlib/SetTheory/Cardinal/Cofinality.lean	1	8	['YnirPaz', 'github-actions', 'vihdzp']	nobody	248-19558 8 months ago	248-19558 8 months ago	1-84890 1 day
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/)	t-topology merge-conflict	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	247-50751 8 months ago	247-50751 8 months ago	72-13986 72 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/)	t-meta merge-conflict	49/49	Cache/Hashing.lean,Cache/IO.lean,lake-manifest.json	3	8	['digama0', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	246-26414 8 months ago	427-78764 1 year 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/)	t-analysis merge-conflict awaiting-author	51/22	Mathlib/Analysis/Normed/Lp/WithLp.lean	1	11	['eric-wieser', 'github-actions', 'leanprover-bot', 'qawbecrdtey']	nobody	245-55853 8 months ago	245-55853 8 months 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/)	new-contributor t-analysis merge-conflict awaiting-author	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	245-51081 8 months ago	245-51081 8 months ago	29-48368 29 days
22805	ScottCarnahan author:ScottCarnahan	feat (FieldTheory/Finite): fixed points of frobenius	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/)	t-algebra merge-conflict WIP 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	243-61793 7 months ago	243-61793 7 months ago	0-0 0 seconds
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/)	t-algebra merge-conflict label:t-algebra$	133/67	Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean	3	1	['github-actions']	nobody	241-77510 7 months ago	241-77510 7 months 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/)	t-linter merge-conflict 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	241-23144 7 months ago	241-23144 7 months ago	7-47472 7 days
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/)	infinity-cosmos t-category-theory merge-conflict WIP	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	240-28750 7 months ago	240-28752 7 months ago	0-0 0 seconds
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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	92/16	Mathlib/Algebra/BigOperators/Fin.lean	1	14	['YaelDillies', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	239-45177 7 months ago	239-45177 7 months 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/)	t-analysis merge-conflict	116/53	Mathlib/Analysis/Normed/Lp/PiLp.lean	1	1	['github-actions']	nobody	238-33725 7 months ago	238-33725 7 months ago	0-0 0 seconds
19189	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Arithmetic): order isomorphism between omega and the natural numbers	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	44/0	Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean	2	21	['YaelDillies', 'YnirPaz', 'github-actions', 'vihdzp']	nobody	238-14810 7 months ago	238-14810 7 months ago	47-37012 47 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/)	CI merge-conflict awaiting-author	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	236-64213 7 months ago	236-64214 7 months ago	22-71271 22 days
20874	grunweg author:grunweg	chore(nolint.yml): use shallow clones	This should be sufficient, and be slightly faster on CI. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict awaiting-author	0/3	.github/workflows/nolints.yml	1	2	['bryangingechen', 'github-actions']	nobody	236-63968 7 months ago	236-63968 7 months ago	0-15573 4 hours
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/)	t-order t-topology merge-conflict WIP	161/9	Mathlib/Data/ENat/Basic.lean,Mathlib/Topology/Instances/ENat.lean	2	4	['YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	232-21745 7 months ago	232-21745 7 months ago	0-6819 1 hour
18284	chrisflav author:chrisflav	feat(AlgebraicGeometry): relative gluing of schemes	We show https://stacks.math.columbia.edu/tag/01LH using #14208. This shall be used to construct the relative spectrum of a quasi-coherent algebra. --- - [ ] depends on: #14208 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict WIP	1393/7	Mathlib.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/RelativeGluing.lean,Mathlib/AlgebraicGeometry/Sites/Representability.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/MorphismProperty/Representable.lean	8	n/a	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	231-44497 7 months ago	unknown	unknown
16810	urkud author:urkud	feat: define `(a : ENat) ^ (b : ENat)`	The definition agrees with `Cardinal.toENat`, i.e., `#(α → β) = #β ^ #α`, where `#` is the not-yet-defined `ENat.card α = Cardinal.toENat (Cardinal.mk α)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	51/0	Mathlib.lean,Mathlib/Data/ENat/Pow.lean	2	1	['github-actions']	nobody	231-938 7 months ago	231-938 7 months ago	0-0 0 seconds
16009	Command-Master author:Command-Master	acyclic graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict WIP	232/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	1	['github-actions']	nobody	230-56294 7 months ago	230-56294 7 months ago	0-0 0 seconds
20613	grunweg author:grunweg	chore: golf using `List.toArrayMap`	--- Depends on batteries#1090 landing in mathlib. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	27/21	Cache/Main.lean,Cache/Requests.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Tactic/DeriveTraversable.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Util/CompileInductive.lean,Mathlib/Util/GetAllModules.lean,Mathlib/Util/Notation3.lean,scripts/autolabel.lean	11	2	['github-actions', 'vihdzp']	nobody	228-20711 7 months ago	228-20711 7 months ago	22-82622 22 days
22682	grunweg author:grunweg	chore(Topology/Homeomorph): split out various constructions	This makes `Homeomorph.lean` slightly more manageable, and also is a mild import reduction. edit: also split out IsHomeomorph, as this allows removing the dependencies on Constructions. Let's see if this gains much --- I don't feel strongly about this PR, but we might as well take it. - [ ] depends on: #22681 - [ ] depends on #22827 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology RFC merge-conflict	341/290	Mathlib.lean,Mathlib/Topology/Category/TopCat/ULift.lean,Mathlib/Topology/Homeomorph/Constructions.lean,Mathlib/Topology/Homeomorph/IsHomeomorph.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/NoetherianSpace.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	227-10317 7 months ago	227-10317 7 months ago	14-35834 14 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 new-contributor merge-conflict awaiting-author enhancement	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	n/a	['chrisflav', 'eric-wieser', 'github-actions', 'j-loreaux', 'markimunro']	nobody	227-80 7 months ago	unknown	unknown
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	226-25910 7 months ago	226-25910 7 months ago	0-3019 50 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	225-69716 7 months ago	283-52669 9 months ago	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	t-analysis t-topology merge-conflict WIP	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	225-62372 7 months ago	225-62400 7 months ago	0-84180 23 hours
13124	FR-vdash-bot author:FR-vdash-bot	chore: remove `CovariantClass` and `ContravariantClass`	Lean cannot handle `CovariantClass` and `ContravariantClass` correctly - TC slowness - [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/TC.20slowness) - https://github.com/leanprover-community/mathlib4/issues/6646#issuecomment-1691792488 - It may also have made #6326 fail. - Needs a weird hack to find instance: #9252 --- - [x] depends on: #13154 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/486	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Subgroup/Pointwise.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/AddTorsor.lean,Mathlib/Algebra/Order/Group/Action.lean,Mathlib/Algebra/Order/Group/DenselyOrdered.lean,Mathlib/Algebra/Order/Group/Units.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Ring/Subring/Pointwise.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/SumOverResidueClass.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Filter/IsBounded.lean,Mathlib/Order/Filter/Pointwise.lean,Mathlib/Probability/Kernel/Defs.lean,Mathlib/RingTheory/Ideal/Pointwise.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean	37	6	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	225-3949 7 months ago	225-3949 7 months ago	0-1769 29 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/)	t-measure-probability merge-conflict awaiting-author	37/28	Mathlib/MeasureTheory/Decomposition/Exhaustion.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean	2	4	['RemyDegenne', 'github-actions', 'sgouezel']	nobody	224-9103 7 months ago	224-9104 7 months ago	0-73190 20 hours
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 delegated	8/0	lakefile.lean	1	20	['YaelDillies', 'adomani', 'eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors']	nobody	223-59671 7 months ago	223-59671 7 months ago	0-214 3 minutes
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/)	t-order t-algebra merge-conflict WIP 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	223-46092 7 months ago	unknown	unknown
22727	grunweg author:grunweg	feat: rewrite the isolated by and colon linters in Lean	--- - depends on #22726 - depends on: #22728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author	128/96	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Data/Finsupp/AList.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/TFAE.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Data/Matroid/Minor/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/LinearAlgebra/TensorProduct/Vanishing.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Probability/Kernel/WithDensity.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Topology/Sets/OpenCover.lean,scripts/lint-style.py	15	3	['adomani', 'github-actions', 'grunweg']	nobody	222-35389 7 months ago	222-35389 7 months ago	10-50342 10 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	new-contributor t-measure-probability t-analysis merge-conflict awaiting-author	60/1	Mathlib/MeasureTheory/Integral/FundThmCalculus.lean	1	3	['github-actions', 'hrmacbeth', 'victorliu5296']	nobody	221-81469 7 months ago	221-81469 7 months ago	51-85104 51 days
22701	ctchou author:ctchou	feat(Combinatorics): the Katona circle method	This file formalizes the Katona circle method. From PlainCombi (LeanCamCombi): https://github.com/YaelDillies/LeanCamCombi/blob/master/LeanCamCombi/PlainCombi/KatonaCircle.lean Co-authored-by: Yaël Dillies	new-contributor t-combinatorics merge-conflict	121/0	Mathlib.lean,Mathlib/Combinatorics/KatonaCircle.lean	2	1	['github-actions']	nobody	221-31024 7 months ago	221-31024 7 months ago	30-8337 30 days
23402	mattrobball author:mattrobball	refactor(LinearAlgebra.TensorProduct): make `TensorProduct` irreducible	Mathematicians generally do not reason about tensor products using a particular model, precisely because the universal properties are more natural and the precise instantiations are too complicated for most purposes. Similarly, we shouldn't allow Lean to look inside `TensorProduct` and encourage building API on top of it to avoid definitional abuse. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	124/69	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct/Isometries.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Subalgebra.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Bialgebra/TensorProduct.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/Kaehler/CotangentComplex.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/LocalRing/Module.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	15	8	['eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	220-85729 7 months ago	220-85730 7 months ago	0-0 0 seconds
15943	urkud author:urkud	feat: add `ProdQuotientMapSpace`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	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	220-13441 7 months ago	220-13444 7 months ago	0-0 0 seconds
23786	grunweg author:grunweg	Mr librarynote def 2b	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	510/484	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/ZMod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Colimit/Ring.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Field/MinimalAxioms.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/End.lean,Mathlib/Algebra/Group/Action/Hom.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/MinimalAxioms.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Group/Units/Hom.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/End.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/GroupWithZero/Equiv.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Lie/Basic.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Rat.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/Algebra/Module/ZMod.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Group/InjSurj.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Monoid/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/ExistsOfLE.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Order/Sub/Basic.lean,Mathlib/Algebra/Ring/Action/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/MinimalAxioms.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Star/StarRingHom.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/InnerProductSpace/Convex.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Operator/LinearIsometry.lean,Mathlib/Analysis/Normed/Order/Lattice.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Comma/Over/OverClass.lean,Mathlib/CategoryTheory/Monoidal/Skeleton.lean,Mathlib/CategoryTheory/MorphismProperty/Comma.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/FunLike/Fintype.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean	180	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	220-5542 7 months ago	220-5544 7 months ago	0-0 0 seconds
23411	PatrickMassot author:PatrickMassot	chore: remove finiteness from Order.Filter.Lift	Co-authored-by: Anatole Dedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	longest-pole t-topology merge-conflict	48/21	Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Order/Filter/Lift.lean,Mathlib/Order/Filter/SmallSets.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Basic.lean	7	4	['Vierkantor', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	219-77738 7 months ago	220-10907 7 months ago	10-21608 10 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/)	t-topology merge-conflict awaiting-author documentation	10/9	Mathlib/Topology/Defs/Induced.lean,Mathlib/Topology/RestrictGen.lean	2	4	['github-actions', 'kvanvels', 'leanprover-community-bot-assistant', 'urkud']	nobody	219-1972 7 months ago	219-1974 7 months ago	12-18679 12 days
19771	robertylewis author:robertylewis	perf: qqify two functions in linarith	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	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	218-67878 7 months ago	218-67879 7 months ago	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/)	new-contributor t-analysis merge-conflict WIP	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	218-67389 7 months ago	218-67391 7 months ago	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/)	new-contributor t-category-theory merge-conflict	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	218-63657 7 months ago	218-63658 7 months ago	58-20339 58 days
21525	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Prelim)	This PR defines the basic preliminaries for defining locally cartesian closed categories (LCCCs). In particular, using the calculus of mates we define certain natural isomorphisms involving `Over.star` and `Over.pullback` which will be crucial in defining the right adjoint to the pullback functor in the development of LCCCs. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict	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	218-63655 7 months ago	218-63657 7 months ago	43-83249 43 days
13653	adomani author:adomani	feat: the unusedSetOptionIn linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	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	218-8093 7 months ago	218-8095 7 months ago	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	217-76189 7 months ago	217-76191 7 months ago	4-16654 4 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/)	new-contributor t-topology merge-conflict awaiting-author	281/1	Mathlib.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Lift.lean	3	9	['alreadydone', 'github-actions', 'grunweg', 'vbeffara']	nobody	217-66385 7 months ago	217-66385 7 months ago	55-53553 55 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/)	t-category-theory merge-conflict WIP	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	216-86394 7 months ago	217-3517 7 months ago	0-568 9 minutes
6252	michaellee94 author:michaellee94	feat(Geometry/Manifolds/Instances/Homeomorph): Homeomorphism maps `C^k` manifolds to `C^k` manifolds	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	116/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Graph.lean	2	2	['leanprover-community-bot-assistant', 'michaellee94']	nobody	216-60850 7 months ago	216-60852 7 months ago	1-44375 1 day
16314	FR-vdash-bot author:FR-vdash-bot	chore(Data/Quot): deprecate `ind*'` APIs	--- - [x] depends on: #16264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	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	213-2221 6 months ago	213-2223 6 months ago	55-52030 55 days
23509	eric-wieser author:eric-wieser	refactor: Make ENNReal an abbrev	The `Coe` instance becomes `CoeTC` to match what we do for `WithTop` (such that the priority kicks in) Probably we could have both copies and things would be ok. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This includes part of #23750	t-data merge-conflict	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	212-72274 6 months ago	212-72276 6 months ago	14-12910 14 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/)	t-measure-probability merge-conflict	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	212-61969 6 months ago	212-61971 6 months ago	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	212-33874 6 months ago	482-60464 1 year ago	91-14162 91 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/)	t-category-theory awaiting-CI merge-conflict	22/21	Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean	3	1	['grunweg']	nobody	212-33753 6 months ago	492-62838 1 year ago	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/)	slow-typeclass-synthesis t-algebra awaiting-CI merge-conflict 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	212-33728 6 months ago	482-60723 1 year ago	0-0 0 seconds
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/)	awaiting-CI t-meta merge-conflict	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	212-33554 6 months ago	492-62838 1 year ago	29-67421 29 days
15483	FR-vdash-bot author:FR-vdash-bot	chore(GroupTheory/Coset): reduce defeq abuse	--- - [x] depends on: #15482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'mergify', 'urkud']	nobody	212-33514 6 months ago	460-71844 1 year ago	4-79214 4 days
16594	FR-vdash-bot author:FR-vdash-bot	perf: reorder `extends` and remove some instances in algebra hierarchy	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra merge-conflict 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	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	212-33290 6 months ago	416-72837 1 year ago	14-58900 14 days
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	212-804 6 months ago	507-70548 1 year ago	0-0 0 seconds
11297	mattrobball author:mattrobball	mrb/cover data fields	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	949/657	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Associated.lean,Mathlib/Algebra/Category/MonCat/Colimits.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Field/IsField.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/GradedMonoid.lean,Mathlib/Algebra/Group/Aut.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Hom/Instances.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Group/TypeTags.lean,Mathlib/Algebra/Group/Units.lean,Mathlib/Algebra/Group/WithOne/Defs.lean,Mathlib/Algebra/GroupWithZero/Basic.lean,Mathlib/Algebra/GroupWithZero/InjSurj.lean,Mathlib/Algebra/Lie/NonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/Equiv.lean,Mathlib/Algebra/Module/LocalizedModule.lean,Mathlib/Algebra/Order/Group/Cone.lean,Mathlib/Algebra/Order/Interval.lean,Mathlib/Algebra/Order/Monoid/WithTop.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/PEmptyInstances.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/InjSurj.lean,Mathlib/Algebra/Ring/Opposite.lean,Mathlib/Algebra/Ring/Pi.lean,Mathlib/Algebra/Ring/ULift.lean,Mathlib/Algebra/SMulWithZero.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/NormedSpace/ContinuousAffineMap.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Extension.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Groupoid/VertexGroup.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/Combinatorics/Quiver/SingleObj.lean,Mathlib/Combinatorics/Quiver/Symmetric.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/Control/Applicative.lean,Mathlib/Control/Basic.lean,Mathlib/Control/Functor.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Control/ULift.lean,Mathlib/Data/Erased.lean,Mathlib/Data/Int/Basic.lean,Mathlib/Data/Int/Cast/Prod.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Order/Basic.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Rat/Defs.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Sign.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Data/TwoPointing.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/Defs.lean,Mathlib/GroupTheory/GroupAction/Opposite.lean,Mathlib/GroupTheory/GroupAction/Option.lean,Mathlib/GroupTheory/GroupAction/Prod.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/Pointwise.lean,Mathlib/GroupTheory/GroupAction/Units.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Perm/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean,Mathlib/GroupTheory/Submonoid/Pointwise.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/Init/Data/Int/Order.lean,Mathlib/Init/Data/List/Instances.lean,Mathlib/Init/Data/Nat/Lemmas.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/Basis.lean,Mathlib/Logic/Nontrivial/Basic.lean,Mathlib/Logic/Unique.lean,Mathlib/MeasureTheory/Integral/Bochner.lean	120	13	['YaelDillies', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	212-356 6 months ago	610-31028 1 year ago	0-0 0 seconds
20567	grunweg author:grunweg	feat(Cache): two small features	- add an informational message to the get command (when run without arguments): when more than 80% of all cache files present were not used in the last command, tell the user about the `clean` command --- - [ ] depends on #20568 (for the first feature) - [ ] TODO: re-design this feature and the clean command: if there are N local copies of mathlib, cache should have a pointer to all of them - to avoid clearing all N-1 from inside the last local copy [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	38/2	Cache/Main.lean	1	11	['Julian', 'arthurpaulino', 'fpvandoorn', 'github-actions', 'grunweg']	nobody	210-37617 6 months ago	210-37617 6 months ago	1-17369 1 day
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/)	new-contributor t-analysis merge-conflict	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	210-37583 6 months ago	210-37583 6 months ago	25-60481 25 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/)	toric t-category-theory merge-conflict	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	210-37412 6 months ago	210-37412 6 months ago	3-36238 3 days
21714	mattrobball author:mattrobball	test		t-order merge-conflict	13/13	Mathlib/Order/Hom/Lattice.lean,lean-toolchain	2	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	210-36261 6 months ago	210-36261 6 months ago	0-0 0 seconds
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/)	new-contributor t-algebra merge-conflict awaiting-author 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	210-33715 6 months ago	210-33715 6 months ago	13-60072 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/)	t-analysis merge-conflict WIP	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	208-56093 6 months ago	208-56095 6 months ago	0-0 0 seconds
12605	FR-vdash-bot author:FR-vdash-bot	chore: attribute [induction_eliminator]	Add attribute [induction_eliminator] to `AdjoinRoot.induction_on` `ENat.recTopCoe` `ENNReal.recTopCoe` `Finset.induction` `Magma.AssocQuotient.induction_on` `ManyOneDegree.ind_on` `Module.Ray.ind` (and add `Orientation.ind` for `Orientation`, an abbrev of it. I wish that we do not need to add it in the future.) `Multiset.induction` `MvPolynomial.induction_on` `OnePoint.rec` `Opposite.rec'` `Ordinal.limitRecOn` `PartENat.casesOn` `Polynomial.induction_on'` `QuotientAddGroup.induction_on'` (and add `AddCircle.induction_on` for `AddCircle`, an abbrev of it. I wish that we do not need to add it in the future.) `QuotientGroup.induction_on'` (doesn't actually work) `Real.Angle.induction_on` `SimplexCategory.rec` `Trunc.induction_on` --- - [x] depends on: #13476 - [x] depends on: #13264 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	354/342	Mathlib/Algebra/BigOperators/Associated.lean,Mathlib/Algebra/BigOperators/Group/Finset.lean,Mathlib/Algebra/BigOperators/Group/Multiset.lean,Mathlib/Algebra/BigOperators/Ring.lean,Mathlib/Algebra/GCDMonoid/Finset.lean,Mathlib/Algebra/GCDMonoid/Multiset.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Module/BigOperators.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Derivation.lean,Mathlib/Algebra/MvPolynomial/Variables.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval.lean,Mathlib/Algebra/Polynomial/Induction.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SplitSimplicialObject.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/BoxIntegral/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Polynomial.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/NormedSpace/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolynomialExp.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/SetFamily/Compression/Down.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Basic.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Lattice.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/Bind.lean,Mathlib/Data/Multiset/Fold.lean,Mathlib/Data/Multiset/Lattice.lean,Mathlib/Data/Multiset/Pi.lean,Mathlib/Data/Multiset/Powerset.lean,Mathlib/Data/Multiset/Sections.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Quot.lean,Mathlib/Data/Set/Pointwise/BigOperators.lean,Mathlib/FieldTheory/IntermediateField.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/FiniteDimensional.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Projectivization/Basic.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/Logic/Hydra.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/L1Space.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Integral/MeanInequalities.lean,Mathlib/MeasureTheory/Integral/SetIntegral.lean,Mathlib/MeasureTheory/Measure/AddContent.lean	140	14	['FR-vdash-bot', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	208-50708 6 months ago	494-64634 1 year ago	4-46495 4 days
15099	joelriou author:joelriou	feat(CategoryTheory/Sites): the Mayer-Vietoris long exact sequence in sheaf cohomology	In this PR, we obtain the long exact Mayer-Vietoris sequence in sheaf cohomology `... ⟶ H^n₀(S.X₄, F) ⟶ H^n₀(S.X₂, F) ⊞ H^n₀(S.X₃, F) ⟶ H^n₀(S.X₁, F) ⟶ H^n₁(S.X₄, F) ⟶ ...` when `n₀ + 1 = n₁`. It is attached to any "Mayer-Vietoris square", which includes the typical case of a covering by two open subsets in a topological space. (This API shall also apply to the case of Nisnevich distinguished squares of schemes.) --- - [x] depends on: #15770 - [x] depends on: #14793 - [x] depends on: #14515 - [x] depends on: #15092 - [x] depends on: #15053 - [x] depends on: #14867 - [x] depends on: #14959 - [x] depends on: #14957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	348/4	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Biprod.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/Shift/Basic.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/Basic.lean,Mathlib/CategoryTheory/Sites/SheafCohomology/MayerVietoris.lean	8	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	205-80555 6 months ago	unknown	unknown
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/)	t-topology merge-conflict	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	205-76531 6 months ago	205-76534 6 months 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/)	t-order merge-conflict	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	203-53306 6 months ago	203-53308 6 months 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/)	t-algebra merge-conflict 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	203-42003 6 months ago	203-42004 6 months ago	2-12022 2 days
8370	eric-wieser author:eric-wieser	refactor(Analysis/NormedSpace/Exponential): remove the `𝕂` argument from `exp`	This argument is still needed for almost all the lemmas, which means it can longer be found by unification. We keep around `expSeries 𝕂 A`, as it's needed for talking about the radius of convergence over different base fields. This is a prerequisite for #8372, as we can't merge the functions until they have the same interface.\ Zulip thread: [#mathlib4 > Real.exp @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Real.2Eexp/near/401602245) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This is started from the mathport output on https://github.com/leanprover-community/mathlib/pull/19244	awaiting-zulip t-analysis merge-conflict	432/387	Mathlib/Analysis/CStarAlgebra/Exponential.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/Normed/Algebra/MatrixExponential.lean,Mathlib/Analysis/Normed/Algebra/QuaternionExponential.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/NormedSpace/DualNumber.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean	11	29	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	203-22933 6 months ago	214-51563 7 months ago	29-60989 29 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/)	t-euclidean-geometry merge-conflict	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	201-54460 6 months ago	201-54462 6 months ago	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/)	t-algebra merge-conflict awaiting-author 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	201-52178 6 months ago	242-10871 7 months 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/)	t-analysis merge-conflict	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	200-35316 6 months ago	200-35317 6 months ago	0-0 0 seconds
24322	mattrobball author:mattrobball	chore: merge repeated `Type*` binders	Per the discussion on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Task.2026.3A.20Replace.20Type.20u.20by.20Type.20wherever.20possible), this PR merges `(A : Type) (B : Type u)` into `(A B : Type*)` and similarly for `{}`. NOTE: the Python script used it currently in the `/scripts` folder. It is there for inspection and should be removed before merging this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	685/591	Archive/Imo/Imo2019Q2.lean,Archive/Wiedijk100Theorems/HeronsFormula.lean,Mathlib/Algebra/AddTorsor/Basic.lean,Mathlib/Algebra/AddTorsor/Defs.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/FreeMonoid/Basic.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/Group/Action/Sigma.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Group/Submonoid/Basic.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/Defs.lean,Mathlib/Algebra/Group/Subsemigroup/Operations.lean,Mathlib/Algebra/Group/Support.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Algebra/Module/Prod.lean,Mathlib/Algebra/Module/Submodule/EqLocus.lean,Mathlib/Algebra/Module/Submodule/Equiv.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Pointwise.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MonoidAlgebra/Grading.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Comap.lean,Mathlib/Algebra/MvPolynomial/Monad.lean,Mathlib/Algebra/Notation/Prod.lean,Mathlib/Algebra/Order/Quantale.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/QuaternionBasis.lean,Mathlib/Algebra/Ring/CompTypeclasses.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/Algebra/Vertex/HVertexOperator.lean,Mathlib/Algebra/Vertex/VertexOperator.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Asymptotics/Theta.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/Deriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Convex/Cone/Proper.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/Convex/Exposed.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/WeakOperatorTopology.lean,Mathlib/Analysis/LocallyConvex/WeakOperatorTopology.lean,Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Analysis/Normed/Algebra/Basic.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Ring/InfiniteSum.lean,Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Analysis/NormedSpace/ConformalLinearMap.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Bilinear.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/ExpLog.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/GradedObject.lean	343	3	['github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	200-34794 6 months ago	200-34796 6 months ago	2-7052 2 days
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/)	t-algebraic-geometry merge-conflict awaiting-author	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	4	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant']	nobody	199-69374 6 months ago	199-69376 6 months 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/)	t-analysis merge-conflict WIP	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	199-61778 6 months ago	199-61780 6 months ago	23-20319 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/)	carleson t-measure-probability merge-conflict WIP	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	198-54446 6 months ago	198-54448 6 months ago	0-6 6 seconds
24354	grunweg author:grunweg	chore(HasFiniteIntegral): rename three lemmas	Discovered in #24343. --- - [ ] depends on: #24343 (to avoid merge conflicts) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	108/30	Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean	1	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	198-46407 6 months ago	198-46408 6 months ago	0-4604 1 hour
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/)	new-contributor t-number-theory merge-conflict WIP	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	3	['SEU-Prime', 'github-actions', 'leanprover-community-bot-assistant']	nobody	198-7327 6 months ago	204-72733 6 months ago	0-0 0 seconds
24091	mattrobball author:mattrobball	test		merge-conflict	97/46	Mathlib/Algebra/Field/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Span.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Dynamics/BirkhoffSum/NormedSpace.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean,docs/overview.yaml,docs/undergrad.yaml	15	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	197-83145 6 months ago	197-83147 6 months ago	0-0 0 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/)	large-import t-linter merge-conflict WIP	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	197-59685 6 months ago	209-77087 6 months ago	0-109 1 minute
24140	mattrobball author:mattrobball	test		merge-conflict	176/91	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Data/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/NumberTheory/NumberField/ProductFormula.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	17	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	197-58148 6 months ago	197-58150 6 months ago	0-0 0 seconds
13649	FR-vdash-bot author:FR-vdash-bot	chore: redefine `Nat.div2` `Nat.bodd`	The new definitions are faster than the old ones. `Nat.binaryRec` will be moved to batteries (https://github.com/leanprover-community/batteries/pull/799) or core (https://github.com/leanprover/lean4/pull/3756), so relevant contents are moved to a new file temporarily. --- - [x] depends on: #15567 - [x] depends on: #19666 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	63/88	Mathlib/Computability/Primrec.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Size.lean,Mathlib/Logic/Denumerable.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/Logic/Equiv/Nat.lean	8	15	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	195-25553 6 months ago	195-25555 6 months ago	87-51692 87 days
22856	mattrobball author:mattrobball	test		merge-conflict	8/2	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/FieldTheory/Galois/Profinite.lean	4	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	195-13114 6 months ago	195-13116 6 months ago	0-0 0 seconds
23921	alreadydone author:alreadydone	Jyxu/projective trace	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP 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	194-84730 6 months ago	194-84730 6 months ago	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/)	t-algebra t-topology merge-conflict 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	194-84469 6 months ago	194-84469 6 months ago	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/)	large-import t-meta merge-conflict WIP	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	194-84282 6 months ago	194-84282 6 months ago	0-0 0 seconds
19520	erdOne author:erdOne	refactor(Algebra/Module): Redefine `LocalizedModule` in terms of `OreLocalization`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	610/493	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	10	1	['github-actions']	nobody	194-84271 6 months ago	194-84271 6 months ago	8-56155 8 days
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/)	t-meta merge-conflict blocked-by-core-PR	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	194-84262 6 months ago	194-84262 6 months ago	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/)	t-category-theory merge-conflict	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	194-84252 6 months ago	194-84252 6 months ago	0-0 0 seconds
15024	mattrobball author:mattrobball	chore(Algebra.Basic): scope and rename universal `Nat`-algebra and `Int`-algebra instances	We rename `algebraNat` to `Nat.instAlgebraOfSemiring` and `algebraInt` to `Int.instAlgebraOfRing` to be consistent with existing naming conventions. We also scope them to avoid typeclass search tripping over them unnecessarily. --- Moves: - algebraNat -> Nat.instAlgebraOfSemiring - algebraInt -> Int.instAlgebraOfRing [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	178/27	Archive/Wiedijk100Theorems/AbelRuffini.lean,Counterexamples/Pseudoelement.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Category/ModuleCat/Injective.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/UnitTrinomial.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Data/Matrix/Kronecker.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/TensorAlgebra/Basic.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleCardPowDegree.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/GaussSum.lean,Mathlib/NumberTheory/Liouville/Basic.lean,Mathlib/NumberTheory/Liouville/LiouvilleNumber.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/OneVariable.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/NumberTheory/MulChar/Lemmas.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/NumberTheory/NumberField/Norm.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Discriminant.lean,Mathlib/RingTheory/FractionalIdeal/Norm.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Expand.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Roots.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Polynomial/Hermite/Gaussian.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/RootsOfUnity/Lemmas.lean,Mathlib/RingTheory/RootsOfUnity/Minpoly.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Defs.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/RingTheory/WittVector/InitTail.lean,Mathlib/RingTheory/WittVector/IsPoly.lean,Mathlib/RingTheory/WittVector/MulP.lean,Mathlib/RingTheory/WittVector/StructurePolynomial.lean,Mathlib/RingTheory/WittVector/Verschiebung.lean	80	6	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	194-84241 6 months ago	194-84241 6 months ago	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/)	t-topology merge-conflict	157/122	Mathlib/Topology/Separation.lean	1	1	['github-actions']	nobody	194-84236 6 months ago	194-84237 6 months ago	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/)	t-linter merge-conflict WIP	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	194-84231 6 months ago	194-84231 6 months 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	194-84191 6 months ago	194-84217 6 months ago	0-45204 12 hours
14023	mattrobball author:mattrobball	perf(RingTheory.OreLocalization): make data irreducible	We generally do not want to unfold operations passing through `Quotient` if we can avoid it for performance reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	43/32	Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean	3	5	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	194-84086 6 months ago	502-73909 1 year ago	0-0 0 seconds
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/)	t-linter merge-conflict WIP	249/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/Papercut.lean,test/Papercut.lean	5	1	['github-actions']	nobody	194-84076 6 months ago	194-84076 6 months ago	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/)	t-analysis merge-conflict	57/25	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean	1	3	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	194-84011 6 months ago	194-84011 6 months ago	0-0 0 seconds
11523	thorimur author:thorimur	bench: test syntax linter	--- The purpose of this PR is just to bench the "best-case scenario" for a linter which iterates through syntax, updating and checking a simple counter along the way. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	22/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Tactic/Common.lean	3	3	['grunweg', 'leanprover-bot', 'thorimur']	nobody	194-83920 6 months ago	194-83920 6 months ago	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/)	t-measure-probability merge-conflict awaiting-author	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	194-83822 6 months ago	194-83822 6 months ago	0-0 0 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/)	t-algebra merge-conflict please-adopt label:t-algebra$	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	194-83810 6 months ago	194-83810 6 months ago	0-0 0 seconds
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/)	t-data merge-conflict WIP	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	194-83804 6 months ago	194-83804 6 months ago	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/)	t-algebra merge-conflict 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	194-83799 6 months ago	626-53812 1 year ago *	0-0 0 seconds *
4979	mhk119 author:mhk119	doc(Data/Nat/Bitblast): initial commit	Initial commit of Bitblast.lean where we prove equivalence of bitblast unsigned less than and bitblast addition. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	202/4	Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Pow.lean	3	49	['ChrisHughes24', 'digama0', 'goens', 'grunweg', 'j-loreaux', 'kim-em', 'mhk119']	nobody	194-83788 6 months ago	194-83788 6 months ago	7-68358 7 days
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/)	t-algebra merge-conflict 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	194-83752 6 months ago	194-83752 6 months ago	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/)	t-analysis merge-conflict WIP	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	194-83718 6 months ago	194-83718 6 months ago	0-0 0 seconds
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/)	t-algebra merge-conflict WIP 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	n/a	['FMLJohn', 'github-actions']	nobody	194-83700 6 months ago	unknown	unknown
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/)	t-linter merge-conflict	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	194-83551 6 months ago	194-83551 6 months ago	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/)	t-analysis merge-conflict	108/1	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean	2	1	['github-actions']	nobody	194-83364 6 months ago	194-83364 6 months ago	0-0 0 seconds
22269	Thmoas-Guan author:Thmoas-Guan	chore(Algebra): replace Submodule.quotient.mk with Submodule.mkQ	Replace Submodule.quotient.mk with Submodule.mkQ as much as possible as it have better composition property and more direct lemmas, making it more similarly with `Ideal.Quotient.mk` (except Algebra.Lie.Quotient.Basic for ones more familiar with these area) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	431/218	Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Quotient/Defs.lean,Mathlib/LinearAlgebra/Quotient/Pi.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/TensorProduct/Quotient.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/Ideal/Colon.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/QuotSMulTop.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/TensorProduct/Quotient.lean	33	10	['Thmoas-Guan', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	193-76103 6 months ago	193-76103 6 months ago	16-61571 16 days
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/)	t-algebra t-topology merge-conflict 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	193-76035 6 months ago	193-76035 6 months ago	0-0 0 seconds
23546	JovanGerb author:JovanGerb	feat(LinearAlgebra/AffineSpace/AffineSubspace): rename `AffineSubspace.mk'` to `Submodule.shift`	In addition to renaming, I've refactored the code a bit: - `mem_mk'_iff_vsub_mem` was obsolete since it was the same as `mem_mk'`, so I removed it (this is due to a change in the definition I made recently) - I added a nonempty instance for `shift` - I added a simp lemma that `shift` isn't equal to `⊥` (the empty affine subspace). I need this for the next point. - Edit: I'll leave this for a later PR. ~I proved a simp lemma that a `shift` is parallel to a `shift` if and only if the linear subspaces are the same.~ - I renamed `mk'_eq` to `shift_direction_eq_self `. - I renamed `eq_or_eq_secondInter_of_mem_mk'_span_singleton_iff_mem` to `eq_or_eq_secondInter_iff_mem_of_mem_shift_span_singleton`. I think it is better to put the `of_mem_mk'_span_singleton` at the end of the name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry merge-conflict	128/99	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/PerpBisector.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean,Mathlib/Geometry/Euclidean/Sphere/Tangent.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean	7	4	['JovanGerb', 'github-actions', 'leanprover-community-bot-assistant']	nobody	193-58535 6 months ago	193-58536 6 months ago	26-25420 26 days
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/)	t-data merge-conflict awaiting-author	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	191-32794 6 months ago	191-32794 6 months ago	43-81255 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/)	CI merge-conflict delegated WIP	22/1	.github/workflows/PR_summary.yml,scripts/zulip_emoji_merge_delegate.py	2	10	['adomani', 'github-actions', 'leanprover-community-bot-assistant']	nobody	190-44118 6 months ago	190-44120 6 months ago	0-0 0 seconds
7907	urkud author:urkud	feat: introduce `NthRoot` notation class	Also use it for `Real.sqrt`, and replace the few occurrences of `sqrt` that do not already use the notation. --- [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60Sqrt.60.20notation.20typeclass/near/400086502) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis awaiting-CI merge-conflict label:t-algebra$	193/156	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q2.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/AreaOfACircle.lean,Mathlib.lean,Mathlib/Algebra/NthRoot.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Bounds.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Sqrt.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/NumberTheory/Harmonic/GammaDeriv.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Discriminant/Basic.lean,Mathlib/Probability/Distributions/Gaussian.lean,MathlibTest/positivity.lean	28	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	189-59908 6 months ago	443-73466 1 year ago	0-0 0 seconds
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/)	carleson t-analysis merge-conflict WIP	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	185-52793 6 months ago	185-52796 6 months ago	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/)	carleson t-measure-probability awaiting-CI merge-conflict	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	184-74477 6 months ago	194-84511 6 months ago	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/)	carleson t-measure-probability awaiting-CI merge-conflict WIP	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	184-68852 6 months ago	194-84506 6 months ago	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/)	t-algebra merge-conflict 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	184-53182 6 months ago	184-53184 6 months ago	0-0 0 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 t-topology merge-conflict awaiting-author help-wanted	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	182-65187 5 months ago	207-49491 6 months ago	21-25493 21 days
17129	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unicode variant-selectors	Unicode characters can be followed by one of the two "variant-selectors" `\FE0E` (text) or `\FE0F` (emoji). These appear to the user as a single unicode character and they might copy them by accident. For example `✅️` (`\u2705\uFE0F`), `✅` (`\u2705`) and `✅︎` (`\u2705\uFE0E`) are three variants of the "same" unicode character. The one without variant-selector might display as either emoji or not, depending on the user's device and font. Add unicode linter ensuring variant-selector only appear on specified characters and also ensuring these characters always have the correct variant selector to avoid confusions. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font ## Related PRs: - leanprover/lean4#5015 added some emoji-variant selectors to Emojis used in `Lean` itself. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict delegated awaiting-author	245/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousMap/Weierstrass.lean,MathlibTest/LintStyleTextBased.lean	11	25	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant']	nobody	181-53693 5 months ago	181-53695 5 months ago	82-54712 82 days
17131	joneugster author:joneugster	feat(Tactic/Linter): add unicode linter for unwanted characters	Add unicode linter flagging bad unicode characters. In this first form, the linter only flags `\u00A0` (non-breaking space) and replaces it with a normal space. Non-breaking space has been chosen because they keep reappearing in mathlib and it seems to be uncontroversial to lint for these. The whitelist/blacklist could then be refined in future PRs. Everything flagged by this linter can be fixed fully automatically with `lake exe lint-style --fix` or by commenting `bot fix style` on the PR. --- - tracking PR: #16215 ## Zulip discussions: - https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F - https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Lean.20specific.20font [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict awaiting-author	112/8	Mathlib.lean,Mathlib/Algebra/Lie/Semisimple/Lemmas.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/LinearAlgebra/Vandermonde.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean	8	6	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	adomani and grunweg assignee:grunweg assignee:adomani	181-53692 5 months ago	181-53694 5 months ago	52-18594 52 days
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/)	t-algebra merge-conflict awaiting-author WIP 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	180-59723 5 months ago	180-59724 5 months ago	0-0 0 seconds
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/)	CI merge-conflict awaiting-author	3/3	.github/build.in.yml,.github/workflows/actionlint.yml	2	12	['adomani', 'bryangingechen', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	179-4727 5 months ago	179-4728 5 months ago	0-0 0 seconds
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/)	t-category-theory merge-conflict WIP	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	n/a	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'yuma-mizuno']	nobody	175-30298 5 months ago	unknown	unknown
22837	joneugster author:joneugster	feat(Data/Set/Basic): add subset_iff and not_mem_subset_iff	Add `Set.subset_iff` for consistent API with `Finset.subset_iff`. Add `Set.not_mem_subset_iff` and `Finset.not_mem_subset_iff`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-data merge-conflict	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant']	nobody	172-61535 5 months ago	172-61537 5 months ago	30-35190 30 days
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	172-61016 5 months ago	172-61017 5 months ago	0-0 0 seconds
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/)	tech debt merge-conflict awaiting-author	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	172-60891 5 months ago	172-60893 5 months ago	34-33204 34 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). --- - [ ] depends on: #24570 - [ ] 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/)	t-linter merge-conflict	58/19	Mathlib/Tactic/Linter/TextBased.lean,scripts/lint-style.lean	2	19	['Vierkantor', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	joneugster assignee:joneugster	171-67023 5 months ago	171-67026 5 months ago	43-17409 43 days
24163	urkud author:urkud	refactor(TangentCone): redefine for TVS	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	421/284	Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Topology/Algebra/ConstMulAction.lean	3	4	['github-actions', 'leanprover-community-bot-assistant']	nobody	171-12340 5 months ago	171-12341 5 months ago	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/)	large-import new-contributor t-topology merge-conflict	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	170-48753 5 months ago	170-48755 5 months 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/)	t-category-theory merge-conflict WIP	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	165-61379 5 months ago	551-78796 1 year ago	0-0 0 seconds
8740	digama0 author:digama0	fix: improve `recall` impl / error reporting	Simplifies the implementation of `recall`, fixing a bug [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/.60recall.60.20strangeness/near/405076713) and also eliminating a use of `open private`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta merge-conflict awaiting-author	27/39	Mathlib/Tactic/Recall.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	163-78640 5 months ago	163-78642 5 months ago	0-0 0 seconds
21182	joneugster author:joneugster	fix(Util/CountHeartbeats): move elaboration in #count_heartbeats inside a namespace	Currently the `#count_heartbeat` linter reported the heartbeats until it concluded `error: [declaration] has already been declared` instead of re-elaborating the declaration. --- [Zulip report](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/count_heartbeats.20for.20all.20declarations.20in.20a.20file.3F/near/496303652) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	17	['adomani', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib-bors']	adomani assignee:adomani	163-77501 5 months ago	163-77502 5 months ago	64-19141 64 days
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/)	large-import t-linter merge-conflict	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	n/a	['github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	163-56137 5 months ago	unknown	unknown
23371	grunweg author:grunweg	chore: mark `Disjoint.{eq_bot, inter_eq}` simp	And add the analogous lemma to `Finset`. Spun out from #22964, hence transitively part of my bordism theory project. Some lemmas there are more conveniently stated with `Disjoint`, which requires tagging at least `inter_eq` with simp. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict awaiting-author	12/11	Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/Disjoint.lean,Mathlib/Topology/Compactification/OnePoint.lean,Mathlib/Topology/Order/OrderClosed.lean	7	31	['YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	162-61862 5 months ago	162-61865 5 months ago	32-65400 32 days
16020	adomani author:adomani	feat: compare PR `olean`s size with `master`	Adds two CI steps: * `print the sizes of the oleans` that prints the sizes of all the folders containing `Mathlib` `.olean`s; * `compare oleans` that compares the sizes of the previous step with the corresponding sizes on `master`. In the test runs, the two steps have taken at most 3 seconds combined (the first is virtually instantaneous, the second one depends on `curl` to find a job id and on `gh` to retrieve the logs of a previous CI run -- everything else appears to be negligible). This hopefully helps finding out if some PR is bloating up the `.olean`s. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Error.3A.20No.20space.20left.20on.20device/near/463792355) for a PR of mine that prompted this check. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	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	161-12360 5 months ago	161-12362 5 months ago	285-26861 285 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/)	CI merge-conflict awaiting-author WIP	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	161-12360 5 months ago	161-12361 5 months ago	0-16 16 seconds
25507	eric-wieser author:eric-wieser	chore(RingTheory/Valuation): golf using `Con`	This has no particular motivation besides seeing if `Con` is a performant substitute. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-algebra merge-conflict label:t-algebra$	20/35	Mathlib/RingTheory/Valuation/ValuationRing.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	161-3839 5 months ago	161-3840 5 months ago	0-0 0 seconds
12799	jstoobysmith author:jstoobysmith	feat(LinearAlgebra/UnitaryGroup): Add properties of Special Unitary Group	Add properties of the special unitary group, mirroring the properties of found in Algebra/Star/Unitary.lean. In particular, I add an instance of `specialUnitaryGroup` as a `Group`, `Star`, `InvolutiveStar`, and `StarMul`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	8	['chrisflav', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	160-20706 5 months ago	160-20708 5 months ago	9-22007 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/)	t-data merge-conflict	190/47	Mathlib/Data/Nat/Find.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	159-72395 5 months ago	159-72397 5 months ago	62-25661 62 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/)	t-convex-geometry merge-conflict	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	159-71580 5 months ago	159-71582 5 months ago	6-40169 6 days
13994	grunweg author:grunweg	chore(Topology): replace continuity -> fun_prop	Addresses a few porting notes; I expect also a substantial speed-up of some proofs. Change a few default values of proof fields from `continuity` to `fun_prop`; this required a few fix-ups downstream. (I checked a few instances; the failure seems related to `Continuous.subtype_mk` not always firing.) This is almost (but not fully) exhaustive. ---------- One proof gets partially un-automated (cont. -> partial fun_prop); if desired, I can revert this change. - [x] depends on: #11092 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	105/20	Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Dynamics/Flow.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/Monoid.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/ContinuousMap/Basic.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Instances/RealVectorSpace.lean,Mathlib/Topology/MetricSpace/Perfect.lean,Mathlib/Topology/UnitInterval.lean	18	12	['MichaelStollBayreuth', 'github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	159-3853 5 months ago	434-23484 1 year ago	28-21477 28 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/)	CI merge-conflict awaiting-author WIP	2/1	.github/workflows/PR_summary.yml	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	159-1847 5 months ago	159-1849 5 months ago	0-6023 1 hour
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/)	t-meta merge-conflict delegated awaiting-author	306/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/UpdateDeprecations.lean,MathlibTest/UpdateDeprecations.lean,lakefile.lean,scripts/README.md,scripts/update_deprecations.lean	7	16	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'leanprover-community-bot-assistant', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	156-20582 5 months ago	156-20583 5 months ago	34-82472 34 days
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/)	t-meta merge-conflict modifies-tactic-syntax	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	155-25894 5 months ago	155-25896 5 months ago	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/)	new-contributor t-meta merge-conflict awaiting-author	171/48	Mathlib/Tactic/Polyrith.lean,scripts/polyrith_sage.py	2	16	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco', 'mkoeppe']	nobody	153-13259 5 months ago	272-77621 8 months ago	27-65384 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/)	t-data merge-conflict WIP	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	150-54739 4 months ago	150-54741 4 months ago	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/)	t-algebra t-topology merge-conflict 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	147-63321 4 months ago	147-63323 4 months 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/)	t-algebra t-topology merge-conflict 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	147-63319 4 months ago	147-63321 4 months 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/)	t-algebra t-topology merge-conflict 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	147-63318 4 months ago	147-63319 4 months 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/)	t-data merge-conflict	518/0	Mathlib.lean,Mathlib/Data/DigitExpansion/Defs.lean,docs/references.bib	3	11	['eric-wieser', 'github-actions', 'kim-em', 'pechersky']	dupuisf assignee:dupuisf	144-45609 4 months ago	382-71825 1 year ago	129-57991 129 days
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	n/a	[]	nobody	135-61434 4 months ago	unknown	unknown
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/)	large-import t-linter merge-conflict WIP	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	132-13406 4 months ago	132-13407 4 months ago	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/)	t-combinatorics merge-conflict	243/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean,Mathlib/Data/CombinatorialMap.lean	3	28	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-bot-assistant']	kmill assignee:kmill	132-11184 4 months ago	132-11185 4 months ago	72-51453 72 days
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/)	t-logic merge-conflict awaiting-author	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']	YaelDillies assignee:YaelDillies	132-11183 4 months ago	132-11183 4 months ago	29-26213 29 days
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/)	awaiting-zulip t-algebra merge-conflict 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	132-11182 4 months ago	132-11182 4 months ago	0-66650 18 hours
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/)	t-differential-geometry merge-conflict delegated	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	24	['PatrickMassot', 'github-actions', 'grunweg', 'hrmacbeth', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'sgouezel']	grunweg assignee:grunweg	132-11181 4 months ago	132-11181 4 months ago	91-73632 91 days
19444	joelriou author:joelriou	feat(CategoryTheory/Sites): Equivalence of categories of sheaves with a dense subsite that is 1-hypercover dense	The main result is that if `F : C₀ ⥤ C` is a dense subsite (relatively to topologies `J₀` and `J`) and `F.IsOneHypercoverDense J₀ J` (for a certain universe `w`), then if a coefficient category `A` has limits of size `w`, the pushforward functor induces an equivalence `Sheaf J A ≌ Sheaf J₀ A`. We deduce that if `HasSheafify J₀ A`, then `HasSheafify J A` also holds. This was previously known (see `IsDenseSubsite.sheafEquiv` in `Sites.DenseSubsite`) under a somewhat stronger condition about the existence of limits in `A`. --- - [x] depends on: #19517 - [x] depends on: #19519 This is very much a draft. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	937/2	Mathlib.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/SheafEquiv.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	132-11058 4 months ago	132-11058 4 months ago	0-0 0 seconds
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/)	t-category-theory merge-conflict	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	132-10676 4 months ago	132-10677 4 months ago	112-51866 112 days
22952	eric-wieser author:eric-wieser	refactor: reimplement `RingQuot` in terms of `RingCon.Quotient`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	132-10675 4 months ago	132-10676 4 months ago	0-0 0 seconds
23763	grunweg author:grunweg	feat(Linter.openClassical): also lint for Classical declarations as …	…a local or scoped instance. --- - [ ] depends on: #23750 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	138/33	Mathlib/RingTheory/Perfection.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean,MathlibTest/GeneralizeProofs.lean,MathlibTest/LintStyle.lean	5	6	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	132-10668 4 months ago	132-10668 4 months ago	82-7297 82 days
24489	mattrobball author:mattrobball	test		merge-conflict	185/152	Mathlib/Algebra/GCDMonoid/Nat.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Integral.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Isometric.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unique.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Unital.lean,Mathlib/Analysis/Complex/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Choose/Vandermonde.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IsAlgClosed/Spectrum.lean,Mathlib/FieldTheory/KummerExtension.lean,Mathlib/FieldTheory/KummerPolynomial.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/Subgroup/Center.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Grading.lean,Mathlib/LinearAlgebra/ExteriorAlgebra/Grading.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/RingTheory/WittVector/Frobenius.lean,Mathlib/Tactic/Ring/Basic.lean	38	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	132-10274 4 months ago	132-10275 4 months ago	0-0 0 seconds
24558	mattrobball author:mattrobball	test		merge-conflict	32/30	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Data/Matroid/Circuit.lean,Mathlib/Data/Matroid/Closure.lean,Mathlib/Data/Matroid/Loop.lean,Mathlib/Data/Set/Insert.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/Order/Cover.lean	12	5	['github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	132-10273 4 months ago	132-10273 4 months ago	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/)	t-data merge-conflict	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	132-10270 4 months ago	132-10270 4 months 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/)	t-algebra merge-conflict 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	132-10269 4 months ago	132-10269 4 months ago	43-42841 43 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/)	t-algebraic-geometry merge-conflict	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	132-10023 4 months ago	132-10024 4 months ago	45-4961 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/)	large-import t-algebra merge-conflict label:t-algebra$	81/0	Mathlib/LinearAlgebra/TensorProduct/Basic.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-10021 4 months ago	132-10022 4 months ago	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/)	awaiting-zulip new-contributor t-algebraic-geometry merge-conflict	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	132-10020 4 months ago	132-10021 4 months ago	6-51040 6 days
25247	alreadydone author:alreadydone	Projective contraction	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	132-10017 4 months ago	132-10018 4 months ago	0-30 30 seconds
25283	Brian-Nugent author:Brian-Nugent	feat: regular local rings	Adds regular local rings and proves they are integral domains. --- - [ ] depends on: #25280 - [ ] depends on: #25282 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict label:t-algebra$	871/0	.vscode/settings.json,Mathlib.lean,Mathlib/RingTheory/EmbeddingDimension.lean,Mathlib/RingTheory/LocalRingDimension.lean,Mathlib/RingTheory/RegularLocalRing.lean	5	6	['Brian-Nugent', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuanyi-350']	nobody	132-10016 4 months ago	132-10016 4 months ago	11-84822 11 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/)	t-category-theory merge-conflict awaiting-author	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	132-10005 4 months ago	132-10006 4 months ago	11-11653 11 days
25573	JovanGerb author:JovanGerb	feat: define `∃ x > y, ...` notation to mean `∃ x, y < x ∧ ...`	This PR changes the elaboration of the binders `∃ x > y,` and `∀ x > y,` to use `<` instead of `>`, because we want to avoid working with `>` as much as possible (and similarly for `≥` vs `≤` ). The advantage is that we don't need to worry about rewriting with lemmas like `gt_iff_lt`. The disadvantage is that people might find this confusing. [#mathlib4 > naming convention for ≤ and < @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/naming.20convention.20for.20.E2.89.A4.20and.20.3C/near/522910464) The main changes are in `Mathlib.Init`, `Mathlib.Util.Delaborators` and `MathlibTest.delaborators`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	59/52	Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/BoxIntegral/Integrability.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Init.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Egorov.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/Layercake.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Filter/AtTopBot/Finite.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/EMetricSpace/Defs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/MetricSpace/Ultra/Basic.lean,Mathlib/Util/Delaborators.lean,MathlibTest/delaborators.lean	32	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-10004 4 months ago	132-10005 4 months ago	26-17604 26 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$	167/111	Mathlib/Algebra/Module/LocalizedModule/Basic.lean	1	4	['erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	132-9878 4 months ago	132-9879 4 months ago	25-53155 25 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/)	large-import merge-conflict	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	132-9876 4 months ago	132-9877 4 months ago	0-0 0 seconds
25816	sgouezel author:sgouezel	chore: kill coercion from EquivLike to Equiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict WIP	35/37	Mathlib/Logic/Equiv/Defs.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-9862 4 months ago	132-9862 4 months ago	0-1 1 second
25887	eric-wieser author:eric-wieser	feat: add `IsSMulTorsionFree`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	130/12	Mathlib/Algebra/Group/Action/TorsionFree.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Regular/Opposite.lean	3	4	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant']	nobody	132-9728 4 months ago	132-9729 4 months ago	0-0 0 seconds
25963	artie2000 author:artie2000	refactor: Abstract out the substructure lattice construction and SetLike closure operators	--- [![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/20836	merge-conflict	354/179	Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/SetLike/Closure.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-9713 4 months ago	132-9714 4 months ago	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	t-algebraic-geometry merge-conflict	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	132-9711 4 months ago	132-9711 4 months 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/)	t-category-theory merge-conflict WIP	213/0	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Action/ChosenTypeCopowers.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	132-9709 4 months ago	132-9710 4 months ago	0-0 0 seconds
26012	linesthatinterlace author:linesthatinterlace	feat: Low-level derivatives of lifts on `OneHom`, `MulHom` and `MonoidHom`	This PR continues the work from #25290. Original PR: https://github.com/leanprover-community/mathlib4/pull/25290	migrated-from-branch t-algebra merge-conflict label:t-algebra$	785/34	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	132-9706 4 months ago	132-9707 4 months ago	17-68773 17 days
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	132-7721 4 months ago	132-7722 4 months ago	16-56825 16 days
26776	sgouezel author:sgouezel	refactor: make `I` an outparam, and use forgetful inheritance in products	I consider this as a failed experiment, so it's not for merging. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC merge-conflict WIP	2411/1664	Mathlib/Analysis/Asymptotics/Defs.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/Module/Constructions.lean,Mathlib/Analysis/Calculus/InverseFunctionTheorem/ApproximatesLinearOn.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Calculus/TangentConeDef.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Prod.lean,Mathlib/Analysis/NormedSpace/HomeomorphBall.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/AnalyticManifold.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/ContMDiff/Defs.lean,Mathlib/Geometry/Manifold/ContMDiff/NormedSpace.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/IsManifold/ModelWithCornersDef.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/Defs.lean,Mathlib/Geometry/Manifold/MFDeriv/FDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/FiberwiseLinear.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/Topology/Algebra/Constructions.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Algebra/PontryaginDual.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean,Mathlib/Topology/Clopen.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/ContinuousOnMore.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Defs/Basic.lean,Mathlib/Topology/Defs/Filter.lean,Mathlib/Topology/FiberBundle/Basic.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/Instances/Shrink.lean,Mathlib/Topology/Instances/TrivSqZeroExt.lean,Mathlib/Topology/Irreducible.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocallyFinite.lean,Mathlib/Topology/OmegaCompletePartialOrder.lean,Mathlib/Topology/Order/LeftRight.lean,Mathlib/Topology/PartialHomeomorph.lean,Mathlib/Topology/PartialHomeomorphMore.lean,Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Hom.lean	88	0	[]	nobody	131-84054 4 months ago	131-84054 4 months ago	0-1 1 second
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [x] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-topology merge-conflict	350/21	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Pointwise.lean,Mathlib/Topology/Covering/AddCircle.lean,Mathlib/Topology/Covering/Basic.lean,Mathlib/Topology/Covering/Galois.lean,Mathlib/Topology/Homotopy/Lifting.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean	9	18	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	131-48287 4 months ago	131-48288 4 months ago	73-67280 73 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/)	large-import t-topology merge-conflict	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	130-61540 4 months ago	130-61541 4 months 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/)	t-data merge-conflict WIP	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	130-13301 4 months ago	130-13302 4 months ago	3-73380 3 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/)	t-topology merge-conflict	18/0	Mathlib/Topology/StoneCech.lean	1	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	128-77489 4 months ago	128-77489 4 months ago	20-8582 20 days
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/)	new-contributor t-category-theory merge-conflict awaiting-author	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	5	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'robertmaxton42']	nobody	128-17832 4 months ago	128-17833 4 months ago	8-28043 8 days
10541	Louddy author:Louddy	feat(Algebra/SkewMonoidAlgebra/Basic): add SkewMonoidAlgebra	# Skew Monoid algebras This file presents a skewed version of `Mathlib.Algebra.MonoidAlgebra.Basic`. ## Definition We define `SkewMonoidAlgebra k G := G →₀ k` attached with a skewed convolution product. Here, the product of two elements `f g : SkewMonoidAlgebra k G` is the finitely supported function whose value at `a` is the sum of `f x * (x • g y)` over all pairs `x, y` such that `x * y = a`. This will be used in a later PR to define skew polynomial rings. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [x] depends on: #15878 - [x] depends on: #19084 - [x] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra merge-conflict WIP label:t-algebra$	1624/0	Mathlib.lean,Mathlib/Algebra/Group/InjSurj.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewMonoidAlgebra/Lift.lean	4	105	['AntoineChambert-Loir', 'Louddy', 'YaelDillies', 'eric-wieser', 'fpvandoorn', 'github-actions', 'mariainesdff', 'mathlib4-dependent-issues-bot', 'mattrobball']	AntoineChambert-Loir assignee:AntoineChambert-Loir	127-65498 4 months ago	127-65500 4 months ago	179-12934 179 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	t-topology merge-conflict	920/0	Mathlib.lean,Mathlib/Topology/Compactification/OnePointHomeomorph.lean,Mathlib/Topology/Compactification/OnePointRealLemmas.lean	3	3	['bjoernkjoshanssen', 'github-actions', 'leanprover-community-bot-assistant']	nobody	126-83563 4 months ago	128-77491 4 months ago	21-20473 21 days
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [x] depends on: #24179 - [x] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	339/1	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	5	10	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	125-50791 4 months ago	126-9808 4 months ago	2-8297 2 days
25710	Paul-Lez author:Paul-Lez	feat(Mathlib/Analysis/PDE/Quasilinear/Characteristics): the method of characteristics for first order quasilinear PDEs	--- - [x] depends on: #25708 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP	531/0	Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/ODE/Gronwall.lean,Mathlib/Analysis/PDE/Quasilinear/Characteristics.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean,Mathlib/Topology/Separation/Basic.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	125-48984 4 months ago	125-48985 4 months ago	0-1343 22 minutes
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/)	t-meta merge-conflict please-adopt	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	125-40191 4 months ago	125-40191 4 months ago	0-0 0 seconds
26911	JovanGerb author:JovanGerb	chore: fix naming of `mono` and `monotone`	The naming convention says: "We use `_mono` for `a ≤ b → f a ≤ f b` and `_anti` for `a ≤ b → f b ≤ f a`, so we also use `_monotone` for `Monotone f`, `_antitone` for `Antitone f`, `_strictMono` for `StrictMono f`, `_strictAnti` for `StrictAnti f`, etc..." This PR swaps `mono`/`anti` and `monotone`/`antitone` where required so that `monotone` refers to `Monotone`, while `mono` refers to a lemma that might be tagged with `@[gcongr]` This PR does not address - `mul_left_monotone` and `mul_right_monotone` are exactly the wrong way around - `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/)	merge-conflict delegated	238/171	Archive/Imo/Imo1962Q1.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/DiscreteTopologyNonDiscreteUniformity.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Order/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/PSeries.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/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/ENNReal/Operations.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Real/Pi/Bounds.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/Padics/Hensel.lean,Mathlib/Order/Concept.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/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Antilipschitz.lean,Mathlib/Topology/MetricSpace/Holder.lean	59	8	['JovanGerb', 'bryangingechen', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib-bors']	bryangingechen assignee:bryangingechen	125-18896 4 months ago	125-47920 4 months ago	2-60107 2 days
21838	joneugster author:joneugster	feat(Cache): Allow arguments of the form `Mathlib.Data` which correspond to a folder but not a file	--- - [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 awaiting-author	34/11	Cache/IO.lean,Cache/Main.lean	2	11	['eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	123-41048 4 months ago	123-41049 4 months ago	50-67617 50 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/)	t-algebra merge-conflict 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	121-66307 3 months ago	121-66308 3 months ago	36-35321 36 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/)	t-algebra merge-conflict awaiting-author 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	114-30847 3 months ago	114-30847 3 months ago	47-45899 47 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/)	t-category-theory merge-conflict WIP	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	113-74133 3 months ago	113-74135 3 months ago	0-10930 3 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	113-46394 3 months ago	113-46395 3 months ago	0-0 0 seconds
26804	kckennylau author:kckennylau	(WIP) 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/)	t-set-theory merge-conflict WIP	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	112-84252 3 months ago	112-84253 3 months ago	0-163 2 minutes
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.	t-data merge-conflict WIP	40/0	Mathlib/Data/Sign.lean	1	10	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'madvorak']	nobody	112-76745 3 months ago	112-76746 3 months ago	0-0 0 seconds
26608	vihdzp author:vihdzp	feat(SetTheory/Cardinal/Aleph): `o.card ≤ ℵ_ o` and variants	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	24/0	Mathlib/SetTheory/Cardinal/Aleph.lean	1	3	['github-actions', 'kckennylau', 'leanprover-community-bot-assistant']	nobody	111-40764 3 months ago	111-40765 3 months ago	23-63406 23 days
20029	FrederickPu author:FrederickPu	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/)	new-contributor t-meta merge-conflict WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	11	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions', 'leanprover-community-bot-assistant']	nobody	111-37445 3 months ago	111-37446 3 months ago	0-34081 9 hours
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/)	t-meta merge-conflict awaiting-author	139/0	Refactor/Main.lean,lakefile.lean	2	11	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'leanprover-community-bot-assistant', 'mattrobball']	nobody	107-58306 3 months ago	107-58307 3 months ago	4-80741 4 days
26498	EtienneC30 author:EtienneC30	feat: projections and injections for WithLp	Introduce `WithLp.fst` and `WithLp.snd` to avoid defeq abuse by writing `x.1` when `x : WithLp p (α × β)`. Also add a `ContinuousLinearMap` version. Introduce `WithLp.inl` (resp. `WithLp.inr`) as a linear isometry from `α` (resp. β) to `WithLp p (α × β)`. Introduce `PiLp.single` as a linear isometry from `β i` to `PiLp p β`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	107/7	Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/LinearAlgebra/Pi.lean	4	11	['EtienneC30', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	105-69192 3 months ago	105-69192 3 months ago	5-313 5 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/)	t-linter merge-conflict	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	105-68622 3 months ago	105-68622 3 months ago	0-0 0 seconds
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/)	t-algebraic-topology new-contributor merge-conflict WIP	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	105-68604 3 months ago	105-68604 3 months ago	1-20125 1 day
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 new-contributor t-category-theory merge-conflict WIP	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	105-68560 3 months ago	105-68560 3 months ago	7-63215 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/)	t-algebraic-topology merge-conflict WIP	91/24	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/VanKampen.lean	2	1	['leanprover-community-bot-assistant']	nobody	105-68469 3 months ago	105-68469 3 months ago	0-0 0 seconds
26303	joelriou author:joelriou	feat(AlgebraicTopology): the fundamental lemma of homotopical algebra	Given a model category `C`, the fundamental lemma of homotopical algebra (Quillen) shows that it is possible to compute morphisms in the homotopy category of `C` (the localized category with respect to weak equivalences) from `X` to `Y` as a quotient of the type of morphisms from `X` to `Y` in `C` modulo an homotopy relation, when `X` is cofibrant and `Y` is fibrant. In particular, we obtain a version of the Whitehead theorem: a weak equivalence between bifibrant objects (both cofibrant and fibrant) is a homotopy equivalence. We also show that we obtain equivalent categories if we localize `C` or various fullsubcategories (cofibrant objetss, fibrant objects, bifibrant objects) with respect to weak equivalences. (This improves the first formalization I made in 2022 in Lean 3.) (This is sorry-free, but still WIP. In order to do clean proofs, we shall also need the refactor of fullsubcategories...) --- - [x] depends on: #26171 - [x] depends on: #26166 - [x] depends on: #26365 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology large-import t-category-theory merge-conflict WIP	3174/31	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Bifibrant.lean,Mathlib/AlgebraicTopology/ModelCategory/BrownLemma.lean,Mathlib/AlgebraicTopology/ModelCategory/CategoryWithCofibrations.lean,Mathlib/AlgebraicTopology/ModelCategory/Cylinder.lean,Mathlib/AlgebraicTopology/ModelCategory/DerivabilityStructure.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma1.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma2.lean,Mathlib/AlgebraicTopology/ModelCategory/FundamentalLemma3.lean,Mathlib/AlgebraicTopology/ModelCategory/Homotopy.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean,Mathlib/AlgebraicTopology/ModelCategory/IsCofibrant.lean,Mathlib/AlgebraicTopology/ModelCategory/PathObject.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/OfAdjunction.lean,Mathlib/CategoryTheory/Localization/Opposite.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Localization/Quotient.lean,Mathlib/CategoryTheory/MorphismProperty/Quotient.lean	19	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	105-68395 3 months ago	unknown	unknown
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/)	t-algebraic-topology infinity-cosmos t-meta merge-conflict	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	23	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	105-68366 3 months ago	105-68366 3 months ago	88-84229 88 days
26926	adomani author:adomani	draft: `commandStart` more	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict awaiting-author WIP	3160/1085	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Hom/CompTypeclasses.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Embedding/Boundary.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Lemmas.lean,Mathlib/Algebra/Notation/Pi.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/FunctorGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Homotopies.lean,Mathlib/AlgebraicTopology/DoldKan/HomotopyEquivalence.lean,Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean,Mathlib/AlgebraicTopology/DoldKan/Normalized.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/AlgebraicTopology/DoldKan/SplitSimplicialObject.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean,Mathlib/Analysis/Normed/Field/Lemmas.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/FiberedCategory/Cocartesian.lean,Mathlib/CategoryTheory/Functor/Basic.lean,Mathlib/CategoryTheory/Functor/KanExtension/Preserves.lean,Mathlib/CategoryTheory/Functor/OfSequence.lean,Mathlib/CategoryTheory/Limits/Bicones.lean,Mathlib/CategoryTheory/Limits/Constructions/Over/Products.lean,Mathlib/CategoryTheory/Limits/Final/ParallelPair.lean,Mathlib/CategoryTheory/Limits/Preserves/Bifunctor.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Kernels.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Pullbacks.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/FiniteLimits.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Shapes/WideEqualizers.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Pi.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Sites/MayerVietorisSquare.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/Bool/Basic.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Finsupp/Option.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Chain.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/TakeWhile.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/Init.lean	266	18	['MichaelStollBayreuth', 'adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	105-68231 3 months ago	105-68231 3 months ago	0-0 0 seconds
9935	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add constructors for horns	Added a function that given a simplicial set S and a set of n-1 simplexes satisfying certain conditions, creates a morphism in SSet from a n horn to a simplicial set S. Included also are a series of lemmas and definitions used in this construction. In particular I define a function that takes a m-simplex in a horn, and returns the smallest 'index' of face it factors through, and give a series of lemmas related to this. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	105-67961 3 months ago	105-67961 3 months ago	14-58814 14 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/)	t-category-theory awaiting-CI merge-conflict awaiting-author	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	105-66203 3 months ago	132-9723 4 months ago	1-77289 1 day
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/)	t-algebra merge-conflict WIP label:t-algebra$	248/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	105-51446 3 months ago	105-51447 3 months 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/)	t-topology merge-conflict awaiting-author	222/42	Mathlib/Topology/Compactness/Lindelof.lean	1	15	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'urkud']	urkud assignee:urkud	105-21018 3 months ago	105-21019 3 months 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/)	large-import t-algebra merge-conflict 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	105-21007 3 months ago	105-21008 3 months ago	0-0 0 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/)	t-measure-probability merge-conflict WIP	97/17	Mathlib.lean,Mathlib/MeasureTheory/Measure/Typeclasses/FiniteMoments.lean,Mathlib/Probability/Moments/CovarianceBilin.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	104-55883 3 months ago	104-55884 3 months ago	0-1 1 second
26306	j-loreaux author:j-loreaux	refactor: make `IsSelfAdjoint` and `IsIdempotentElem` one-field structures.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	222/224	Mathlib/Algebra/Algebra/Subalgebra/Pointwise.lean,Mathlib/Algebra/Algebra/Unitization.lean,Mathlib/Algebra/DirectSum/Idempotents.lean,Mathlib/Algebra/Group/Idempotent.lean,Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/GroupWithZero/Idempotent.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Order/Ring/Star.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Idempotent.lean,Mathlib/Algebra/Star/Module.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/StarProjection.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/FormallyUnramified.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Data/Complex/Module.lean,Mathlib/LinearAlgebra/Matrix/Hermitian.lean,Mathlib/LinearAlgebra/Matrix/HermitianFunctionalCalculus.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/NumberTheory/NumberField/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/RingTheory/DedekindDomain/Ideal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/IdempotentFG.lean,Mathlib/RingTheory/Ideal/Span.lean,Mathlib/RingTheory/Idempotents.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/Topology.lean,Mathlib/RingTheory/Unramified/Field.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/RingTheory/Unramified/Pi.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	48	6	['github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'themathqueen']	nobody	104-55649 3 months ago	106-1728 3 months ago	37-45446 37 days
25726	tb65536 author:tb65536	(WIP) Galois group of `x ^ n - x - 1`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict WIP label:t-algebra$	512/145	Archive/Wiedijk100Theorems/AbelRuffini.lean,Mathlib/RingTheory/Polynomial/Selmer.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	102-76973 3 months ago	102-76973 3 months ago	0-1 1 second
27267	JovanGerb author:JovanGerb	chore(Order): refactor in preparation for `to_dual`	WIP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	60/52	Mathlib/Data/Nat/Find.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Tactic/Linarith/Frontend.lean,Mathlib/Tactic/Positivity/Core.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	bryangingechen assignee:bryangingechen	101-75579 3 months ago	101-75584 3 months ago	0-0 0 seconds
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/)	t-analysis merge-conflict	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	101-75111 3 months ago	101-75111 3 months ago	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	t-algebraic-geometry merge-conflict	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	n/a	['github-actions', 'leanprover-community-bot-assistant']	nobody	101-74993 3 months ago	unknown	unknown
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	t-algebraic-geometry merge-conflict	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	101-74981 3 months ago	101-74981 3 months ago	0-48 48 seconds
25984	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Affine): add equivalences between points and explicit WithZero types	This PR continues the work from #14627. Original PR: https://github.com/leanprover-community/mathlib4/pull/14627	t-algebraic-geometry merge-conflict	159/52	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	1	['Multramate']	nobody	101-74977 3 months ago	101-74977 3 months ago	0-55 55 seconds
25983	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Scheme): define the affine scheme associated to an elliptic curve	This PR continues the work from #14130. Original PR: https://github.com/leanprover-community/mathlib4/pull/14130	t-algebraic-geometry merge-conflict	557/22	Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean	6	1	['Multramate']	nobody	101-74972 3 months ago	101-74972 3 months ago	0-0 0 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	t-algebraic-geometry merge-conflict	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	101-74967 3 months ago	101-74967 3 months ago	0-57 57 seconds
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 merge-conflict	81/12	Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	3	0	[]	nobody	101-74961 3 months ago	101-74961 3 months ago	0-52 52 seconds
25980	Multramate author:Multramate	feat(GroupTheory/Submonoid/Operations): define homomorphisms of subgroups induced by homomorphisms of groups	This PR continues the work from #10113. Original PR: https://github.com/leanprover-community/mathlib4/pull/10113	t-group-theory merge-conflict	29/6	Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	2	0	[]	nobody	101-74956 3 months ago	101-74956 3 months ago	0-54 54 seconds
25485	VTrelat author:VTrelat	feat(SetTheory/ZFC/Naturals): define natural numbers in ZFC	Extend the model of ZFC with naturals: - define a set `Nat` of naturals following the usual construction (∅, {∅}, {∅, {∅}}, ...) - define a proper type `ZFNat` representing naturals - add theorems on usual algebraic properties of naturals - provide a recursor and induction schemes to define/prove by induction --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depend on: #25483	t-set-theory new-contributor merge-conflict	2095/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Naturals.lean	4	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	101-74781 3 months ago	101-74781 3 months ago	29-51653 29 days
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/)	file-removed t-linter merge-conflict	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	101-74770 3 months ago	101-74770 3 months ago	29-67280 29 days
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/)	t-algebra merge-conflict label:t-algebra$	105/0	Mathlib.lean,Mathlib/LinearAlgebra/Basis/HasCanonicalBasis.lean	2	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	101-74761 3 months ago	101-74761 3 months ago	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/)	large-import t-linter merge-conflict please-adopt	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	101-74756 3 months ago	101-74756 3 months ago	0-0 0 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/)	new-contributor t-meta merge-conflict	17/5	Mathlib/Tactic/ComputeDegree.lean,MathlibTest/ComputeDegree.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74751 3 months ago	101-74751 3 months 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/)	large-import IMO merge-conflict WIP	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	101-74711 3 months ago	101-74711 3 months ago	0-0 0 seconds
14137	mattrobball author:mattrobball	chore(Algebra.Basic): postpone importing algebra instances for `Nat`, `Int`, and `Rat`	This should help typeclass synthesis by avoiding these instances unless absolutely necessary. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	678/356	Counterexamples/Pseudoelement.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom/Basic.lean,Mathlib/Algebra/Algebra/Hom/Int.lean,Mathlib/Algebra/Algebra/Hom/Nat.lean,Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Algebra/Int.lean,Mathlib/Algebra/Algebra/Nat.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Algebra/Rat.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Int.lean,Mathlib/Algebra/Algebra/Subalgebra/Nat.lean,Mathlib/Algebra/Algebra/Subalgebra/Unitization.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Zlattice/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MvPolynomial/Counit.lean,Mathlib/Algebra/MvPolynomial/NatInt.lean,Mathlib/Algebra/MvPolynomial/Supported.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/Polynomial/Int.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Analysis/NormedSpace/Basic.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/LinearAlgebra/Matrix/Adjugate.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/NumberTheory/ClassNumber/AdmissibleAbs.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/Adjoin/FG.lean,Mathlib/RingTheory/Adjoin/NatInt.lean,Mathlib/RingTheory/AlgebraTower.lean,Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Coalgebra/Hom.lean,Mathlib/RingTheory/IntegralClosure.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/FractionRingInt.lean,Mathlib/RingTheory/Localization/Int.lean,Mathlib/RingTheory/Localization/Nat.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/RingTheory/PowerSeries/WellKnown.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/WittVector/MulCoeff.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Instances/Real.lean,test/infer_instance.lean,test/instance_diamonds.lean	64	7	['fpvandoorn', 'github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	101-74707 3 months ago	101-74707 3 months ago	0-0 0 seconds
11632	mattrobball author:mattrobball	chore(Group/RingTheory.Congruence): make `Quotient`'s reducible	These are essentially wrappers and should not expose any data when made reducible. Their use in constructing typeclass instances makes reducible transparency desirable. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-group-theory merge-conflict	16/35	Mathlib/GroupTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Basic.lean	2	14	['eric-wieser', 'fpvandoorn', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mattrobball']	nobody	101-74698 3 months ago	101-74698 3 months ago	2-10495 2 days
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	101-53470 3 months ago	101-53470 3 months ago	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	t-ring-theory merge-conflict WIP	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	100-77178 3 months ago	100-77179 3 months ago	0-79 1 minute
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/)	t-ring-theory merge-conflict WIP	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	100-76838 3 months ago	100-76838 3 months ago	11-9349 11 days
21255	chrisflav author:chrisflav	feat(RingTheory/Smooth): smooth is equivalent to locally standard smooth	This is only a container to not lose the branch name. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	1740/11	Mathlib.lean,Mathlib/RingTheory/Kaehler/Localization.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/FreeKaehler.lean,Mathlib/RingTheory/Smooth/StandardSmoothCotangent.lean,Mathlib/RingTheory/Smooth/StandardSmoothSmooth.lean	6	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	100-76801 3 months ago	100-76801 3 months ago	0-0 0 seconds
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/)	t-ring-theory merge-conflict awaiting-author	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	100-76794 3 months ago	100-76794 3 months ago	35-86379 35 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/)	t-ring-theory large-import merge-conflict awaiting-author	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	100-76779 3 months ago	100-76779 3 months 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/)	t-ring-theory new-contributor merge-conflict	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	100-76772 3 months ago	100-76772 3 months ago	20-16585 20 days
17246	pechersky author:pechersky	feat(RingTheory/PrimaryDecomposition): PIR of Noetherian under jacobson condition	--- - [x] depends on: #17634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict awaiting-author	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	100-76766 3 months ago	100-76766 3 months ago	13-7138 13 days
12744	chrisflav author:chrisflav	feat(RingTheory/Smooth): Noetherian ring of definition	We show that given a smooth `A`-algebra `B`, there exists a subring `A₀` of `A` of finite type over `ℤ` and a smooth `A₀`-algebra `B₀` such that `B = A ⊗[A₀] B₀`. A reference is https://stacks.math.columbia.edu/tag/00TP. This is also a test case for the ring of definition API. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	1212/0	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/RingOfDefinition/BaseChange.lean,Mathlib/RingTheory/RingOfDefinition/Basic.lean,Mathlib/RingTheory/RingOfDefinition/Relations.lean,Mathlib/RingTheory/Smooth/Descent.lean,Mathlib/ToBeMoved.lean	10	0	[]	nobody	100-76741 3 months ago	100-76741 3 months ago	0-0 0 seconds
12743	chrisflav author:chrisflav	feat(RingTheory/RingOfDefinition): basic API	Given a finitely presented algebra `A` over a ring `R`, we may descend to a Noetherian subring `R₀` of `R` and a model of `A` over `R₀`. In this PR we provide basic API for working with polynomial rings over subrings. In particular we provide infrastructure for producing `R₀` and descending polynomials in `R` to polynomials in `R₀` given containment of the coefficients. Notation: `R` is a ring, `R₀` a subring, `p : MvPolynomial ι R` and `s : Set (MvPolynomial ι R)`. ## Main definitions For producing subrings containing a set of polynomials of interest, we provide the following: - `HasCoefficients p R₀`: typeclass expressing that the coefficients of `p` are contained in `R₀`. - `core s`: adjoin the coefficients of a set of polynomials `s` to `ℤ`. - `adjoinCoefficients s R₀`: adjoin the coefficients of a set of polynomials `s` to `R₀`. - `repr p R₀`: Given `[HasCoefficients p R₀]` and a polynomial `p`, this is the representative of `p` as a polynomial over `R₀`. Instances for `HasCoefficients` are provided to ensure that the following facts are automatically inferred: - the coefficients of any polynomial in `s` are contained in `core s`. - if the coefficients of `p` are in `R₀` and we adjoin the coefficients of `s`, then the coefficients of `p` are also in `adjoinCoefficients s R₀`. Now, given a (finitely) presented `R` algebra, expressed through an ideal `I : Ideal R`, a `Model` of `I` is a structure containing - a set `s` of generators of `I` - a subring `R₀` - a proof that the coefficients of `s` are contained in `R₀` Given such a model `M`, we expose: - `M.s₀`: the intersection of `s` with `MvPolynomial ι R₀`. Informally this is simply `s`. - `M.I₀`: the ideal generated by `M.s₀` - `M.A₀`: the quotient `MvPolynomial ι M.R₀ ⧸ MvPolynomial ι M.I₀` In `RingOfDefinition/BaseChange` we show that `R ⊗[R₀] M.A₀` is `R`-isomorphic to `MvPolynomial ι R ⧸ I` (this is done in a more general setting and then specialized to this situation). Since `M.I₀` is not equal to `I` intersected with `R₀`, more technical difficulties arise. To work around these, we introduce - `Relation A`: For an arbitrary `A : Set R`, this is simply `MvPolynomial A R`. In the following we are particularly interested in the case where `A = s = Set (MvPolynomial ι R)` is a set of generators of `I`. An equation `x = y` in `MvPolynomial ι R ⧸ I` can be expressed as `x - y ∈ I`. In this case there exists a `r : Relation s` such that `eval r = x - y`. Here `eval` is a shortcut for `MvPolynomial.eval Subtype.val`, i.e. we evaluate the formal expression `r` in the ring `MvPolynomial ι R`. To preserve this equation in `MvPolynomial ι R₀ ⧸ I₀`, we need to adjoin the coefficients of `r` to `R₀`. For this a similar API is provided, in particular: - `HasRelation r R₀`: a typeclass expressing that the coefficients of `r` are contained in `R₀`. - `adjoinRelations rs R₀`: adjoin the coefficients of a set of relations to `R₀`. - `repr r M`: Given `[HasRelation r M.R₀]`, this is the representative of `r` over `R₀`, i.e. an element of `Relation M.s₀` that is mapped to `r` under the canonical map `Relation M.s₀ → Relation M.s`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	797/0	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/RingOfDefinition/BaseChange.lean,Mathlib/RingTheory/RingOfDefinition/Basic.lean	7	0	[]	nobody	100-76733 3 months ago	100-76733 3 months ago	0-0 0 seconds
12695	chrisflav author:chrisflav	feat(RingTheory/Smooth): smooth morphisms are flat	We show that smooth ring homomorphisms are flat. The strategy for a smooth `A`-algebra `B` is the following: - first we find a model of `B` over a Noetherian base ring - if `A` is Noetherian, we identify `B` as a retract of the adic completion of a polynomial ring over `A`, which is flat This is the summary PR which will be split in several parts. Co-authored-by: Judith Ludwig --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	2767/1	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/AsTensorProduct.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/AdicCompletion/Functoriality.lean,Mathlib/RingTheory/RingOfDefinition.lean,Mathlib/RingTheory/RingOfDefinition/RingModel.lean,Mathlib/RingTheory/RingOfDefinition/Utils.lean,Mathlib/RingTheory/RingOfDefinitionIdeal.lean,Mathlib/RingTheory/Smooth/Descent.lean,Mathlib/RingTheory/Smooth/Flat.lean	16	0	[]	nobody	100-76725 3 months ago	100-76725 3 months ago	0-0 0 seconds
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/)	t-ring-theory large-import merge-conflict	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	100-76710 3 months ago	100-76710 3 months ago	2-7106 2 days
11575	ScottCarnahan author:ScottCarnahan	feat (RingTheory/HahnSeries/Addition): Lemmas on leading terms	The main result of this PR is that when the exponent set is linearly ordered, then removing the leading term in a Hahn series `x` yields a Hahn series `y` that is, if nonzero, of strictly higher order. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict WIP	39/0	Mathlib/RingTheory/HahnSeries/Addition.lean	1	0	[]	nobody	100-76680 3 months ago	100-76680 3 months ago	10-75677 10 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 --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	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	100-76673 3 months ago	100-76673 3 months ago	172-57747 172 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/)	t-ring-theory merge-conflict	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	100-76666 3 months ago	100-76666 3 months ago	0-0 0 seconds
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/)	t-group-theory merge-conflict WIP	206/2	Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean	2	6	['kbuzzard', 'newell']	nobody	100-76509 3 months ago	100-76509 3 months ago	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/)	t-group-theory large-import merge-conflict awaiting-author	53/1	Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean	2	6	['YaelDillies', 'github-actions', 'grunweg', 'urkud']	eric-wieser assignee:eric-wieser	100-76502 3 months ago	100-76502 3 months ago	193-70524 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/)	t-algebra merge-conflict awaiting-author 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	100-74237 3 months ago	100-74238 3 months ago	1-36700 1 day
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/)	CI merge-conflict	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	100-25704 3 months ago	100-25704 3 months 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/)	large-import t-algebraic-geometry t-category-theory merge-conflict WIP	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	100-21053 3 months ago	100-21054 3 months ago	0-530 8 minutes
18254	callesonne author:callesonne	feat(Bicategory/Modification/Pseudo): define modifications between strong natural transformations of pseudofunctors	This PR adds modifications between strong natural transformations of pseudofunctors. At the same time, it improves the existing code on modifications between oplax natural tranformations of oplax functors (by removing some simp lemmas). --- - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	335/55	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	5	26	['callesonne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'robin-carlier', 'yuma-mizuno']	nobody	100-21052 3 months ago	100-21053 3 months ago	36-5602 36 days
24620	mattrobball author:mattrobball	chore(CategoryTheory.Basic): change `aesop_cat`'s intro transparency level to `instances` from `default`	Let's see if this helps much. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	93/88	Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Adjunction/Comma.lean,Mathlib/CategoryTheory/Adjunction/Mates.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/CategoryTheory/Category/GaloisConnection.lean,Mathlib/CategoryTheory/CodiscreteCategory.lean,Mathlib/CategoryTheory/CommSq.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Discrete/Basic.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Functor/EpiMono.lean,Mathlib/CategoryTheory/Functor/FullyFaithful.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/HomCongr.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/LiftingProperties/Adjunction.lean,Mathlib/CategoryTheory/Limits/ConeCategory.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/IsLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Terminal.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean,Mathlib/CategoryTheory/MorphismProperty/OverAdjunction.lean,Mathlib/CategoryTheory/Preadditive/Opposite.lean,Mathlib/CategoryTheory/SingleObj.lean,Mathlib/Topology/Sheaves/Sheaf.lean	31	8	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	100-11857 3 months ago	100-11857 3 months ago	0-0 0 seconds
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/)	t-category-theory merge-conflict	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	100-10412 3 months ago	100-10413 3 months ago	0-0 0 seconds
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	100-8623 3 months ago	100-8623 3 months 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/)	t-algebra merge-conflict WIP label:t-algebra$	17/0	Mathlib/Algebra/Module/Zlattice.lean	1	3	['alreadydone', 'newell']	nobody	99-26511 3 months ago	99-26511 3 months ago	0-0 0 seconds
27286	edegeltje author:edegeltje	refactor(OrderDual): make a one-field structure and remove defeq abuse	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict WIP	683/426	Mathlib/Algebra/Field/Basic.lean,Mathlib/Algebra/Order/Group/Action/Synonym.lean,Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Action/Synonym.lean,Mathlib/Algebra/Order/GroupWithZero/Synonym.lean,Mathlib/Algebra/Order/Module/Synonym.lean,Mathlib/Algebra/Order/Monoid/Unbundled/OrderDual.lean,Mathlib/Algebra/Order/Ring/Synonym.lean,Mathlib/Data/Nat/Cast/Synonym.lean,Mathlib/Logic/Function/Iterate.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/BoundedOrder/Monotone.lean,Mathlib/Order/Circular.lean,Mathlib/Order/Compare.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/GaloisConnection/Defs.lean,Mathlib/Order/Iterate.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Max.lean,Mathlib/Order/MinMax.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/Synonym.lean,Mathlib/Order/WithBot.lean	26	2	['alreadydone', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	99-26233 3 months ago	99-26234 3 months ago	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/)	large-import new-contributor t-number-theory 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	95-80313 3 months ago	95-80313 3 months 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/)	t-category-theory merge-conflict awaiting-author WIP	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	95-73280 3 months ago	95-73281 3 months ago	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/)	t-ring-theory merge-conflict	27/0	Mathlib/RingTheory/Valuation/Basic.lean	1	13	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky', 'wwylele']	nobody	94-58207 3 months ago	94-58208 3 months 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/)	t-ring-theory large-import merge-conflict	73/0	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['JovanGerb', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot']	nobody	94-57836 3 months ago	94-57837 3 months ago	6-6455 6 days
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/)	carleson t-measure-probability merge-conflict WIP	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	94-51557 3 months ago	94-51558 3 months ago	0-1 1 second
27197	alreadydone author:alreadydone	feat(Topology): `IsCoveringMapOn` open set	--- - [x] depends on: #25044 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP	282/28	Mathlib/Topology/Covering.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Maps/Basic.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	93-65107 3 months ago	93-65812 3 months ago	0-0 0 seconds
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/)	large-import t-meta merge-conflict WIP	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	92-72996 3 months ago	92-72997 3 months ago	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/)	t-meta merge-conflict	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	92-72460 3 months ago	92-72461 3 months ago	32-70098 32 days
25483	VTrelat author:VTrelat	chore(Data/Set/Prod, SetTheory/ZFC/Basic): add theorem prod_subset_of_prod and extend ZFC model	Required by @eric-wieser in #24281 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor merge-conflict	103/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean	2	10	['Ruben-VandeVelde', 'VTrelat', 'github-actions', 'leanprover-community-bot-assistant']	nobody	92-62103 3 months ago	132-10010 4 months ago	29-56208 29 days
16150	urkud author:urkud	feat(Dynamics): Hopf decomposition	Prove Hopf decomposition. - [ ] rewrite to work with the saturations right away, not with a wandering set. - [ ] generalize to an action of a countable group, use fundamental domains. --- - [ ] depends on: #16146 - [ ] depends on: #16126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-measure-probability merge-conflict	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	92-40432 3 months ago	92-40433 3 months ago	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/)	t-meta merge-conflict	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	92-27256 3 months ago	92-27256 3 months ago	71-28549 71 days
26394	winstonyin author:winstonyin	feat: existence of local flows on manifolds	This PR continues the work from #21777. Original PR: https://github.com/leanprover-community/mathlib4/pull/21777 Transfer the existence theorem of local flows on vector spaces to manifolds. The precise statement is: > If a vector field `v` on a manifold `M` is continuously differentiable at an interior point `x₀`, then for a given `t₀` there exists a neighbourhood `u` of `x₀`, a positive `ε`, and `γ : M → ℝ → M` such that `γ x` is an integral curve of `v` on `(t₀ - ε, t₀ + ε)` for all `x ∈ u`. This is powerful because all curves `γ x` (each with initial condition `x ∈ u`) share the same existence time interval `(t₀ - ε, t₀ + ε)`, rather than each curve having its own `ε`. This will allow us to show that $C^1$ vector fields on compact manifolds always have global integral curves / global flows. Any suggestions to shorten the proof or split out useful lemmas are welcome! - [x] depends on: #26392 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	154/52	Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean	3	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'winstonyin']	nobody	92-26817 3 months ago	92-26818 3 months ago	0-70 1 minute
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/)	large-import t-algebra merge-conflict 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	90-80102 2 months ago	90-80103 2 months ago	14-59974 14 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. ---	new-contributor t-meta merge-conflict please-adopt modifies-tactic-syntax good first issue	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	90-77571 2 months ago	91-927 2 months ago	22-16933 22 days
14203	dagurtomas author:dagurtomas	feat(Algebra/ModuleCat): descent data	Co-authored-by: Jack McKoen Co-authored-by: Christian Merten Co-authored-by: Joël Riou Co-authored-by: Adam Topaz --- - [ ] depends on: #24530 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebra t-algebraic-geometry t-category-theory merge-conflict WIP label:t-algebra$	253/15	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/Algebra/Homology/ShortComplex/ExactFunctor.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/RingHom/FaithfullyFlat.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/Flat.lean,Mathlib/RingTheory/RingHom/Integral.lean,Mathlib/RingTheory/RingHom/Locally.lean,Mathlib/RingTheory/RingHom/Surjective.lean,Mathlib/RingTheory/RingHom/Unramified.lean,Mathlib/RingTheory/RingHomProperties.lean	16	4	['dagurtomas', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	90-50672 2 months ago	90-50674 2 months ago	0-0 0 seconds
21776	alreadydone author:alreadydone	Invertible modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	89-79651 2 months ago	89-79652 2 months ago	0-0 0 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/)	new-contributor t-measure-probability merge-conflict please-adopt 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	89-69997 2 months ago	89-84885 2 months ago	0-0 0 seconds
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/)	carleson merge-conflict WIP	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	89-61511 2 months ago	89-61512 2 months ago	0-172 2 minutes
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	87-80825 2 months ago	87-80826 2 months ago	0-12793 3 hours
19097	Vierkantor author:Vierkantor	chore(Algebra.Polynomial): split `Polynomial/Basic.lean` into smaller files	This PR splits `Mathlib.Algebra.Polynomial.Basic` into the following files: * `Polynomial/Defs.lean`: definition and ring structure on `R[X]` * `Polynomial/Module.lean`: module structure on `R[X]` * `Polynomial/Monomial.lean`: merged definition of `monomial`, `X`, `C` into the existing file (this is probably the file you want to import from now on) * `Polynomial/EraseUpdate.lean`: definition of `erase` and `update` * `Polynomial/Sum.lean`: definition of `sum` Initially I added the monomial results to a new file, but ended up merging it with `Monomial.lean` since the two of them merge cleanly. --- - [x] depends on: #28030 (going to resurrect this PR on top of that one later) - [x] depends on: #19095 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3109/2500	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	40	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	86-70257 2 months ago	92-63042 3 months ago	0-0 0 seconds
28054	EtienneC30 author:EtienneC30	feat: an abbreviation for sesquilinear forms	Define `SesquilinForm R M := M →ₗ⋆[R] M →ₗ[R] R`. Prove that a `SesquilinForm R M` is symmetric if and only if the corresponding matrix is Hermitian. --- - [ ] depends on: #27873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	181/39	Counterexamples/QuadraticForm.lean,Mathlib.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/OfBilinear.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/LinearAlgebra/SesquilinearForm/Basic.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	86-67585 2 months ago	86-67586 2 months ago	0-0 0 seconds
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	86-30736 2 months ago	86-30737 2 months ago	0-83357 23 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/)	t-algebra merge-conflict awaiting-author label:t-algebra$	7/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	4	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'tristan-f-r']	nobody	86-26375 2 months ago	86-26376 2 months ago	1-55872 1 day
28532	alreadydone author:alreadydone	chore(Algebra/Ring/Defs): add two classes and extend more	Add the missing `NonAssocComm(Semi)ring` and modify existing classes to `extends` more to remove some manual instances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	89/70	Mathlib/Algebra/Colimit/DirectLimit.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/PowerSeries/GaussNorm.lean,Mathlib/RingTheory/Valuation/Discrete/Basic.lean,Mathlib/Tactic/Ring/Basic.lean,MathlibTest/TCSynth.lean	10	17	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	85-50599 2 months ago	85-50600 2 months ago	2-77063 2 days
28675	vihdzp author:vihdzp	chore: deprecate `bsup`, `lsub`, `blsub`	This PR formally deprecates `Ordinal.bsup`, `Ordinal.lsub`, and `Ordinal.blsub`. These arose as ways to construct suprema of ordinals, before we realized it was a much better idea to simply work with the `ConditionallyCompleteLinearOrderBot` structure of `Ordinal`. As a consequence, it gets rid of some longstanding non-deprecated material depending on deprecated material. --- - [x] depends on: #28677 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	315/130	Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	85-44547 2 months ago	85-58220 2 months ago	0-0 0 seconds
27872	JovanGerb author:JovanGerb	chore(gcongr): clean up imports	This PR removes redundant `gcongr` imports. And when we do import `gcongr`, we now also import the core `@[gcongr]` tags, and also `grw`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict delegated	7/23	Archive/Imo/Imo2019Q4.lean,Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/MvPolynomial/SchwartzZippel.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Combinatorics/Additive/PluenneckeRuzsa.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Tactic/GCongr/CoreAttrs.lean,Mathlib/Topology/EMetricSpace/Paracompact.lean	21	11	['JovanGerb', 'bryangingechen', 'github-actions', 'grunweg', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	85-6917 2 months ago	85-6917 2 months ago	4-34325 4 days
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	84-59862 2 months ago	84-59863 2 months ago	2-48353 2 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/)	t-euclidean-geometry merge-conflict awaiting-author help-wanted	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	84-18548 2 months ago	113-53506 3 months ago	0-0 0 seconds
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/)	t-algebra merge-conflict 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	83-65933 2 months ago	212-80938 6 months ago	52-31623 52 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/)	new-contributor merge-conflict	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	83-27179 2 months ago	83-27180 2 months ago	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/)	t-data new-contributor merge-conflict	24/26	Mathlib/Data/TypeVec.lean	1	7	['Equilibris', 'alexkeizer', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	83-27178 2 months ago	83-27179 2 months ago	13-49738 13 days
27868	grunweg author:grunweg	linter indentation playground	--- Trying out the changes in #27525. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict WIP	413/0	Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/CategoryTheory/Sites/Coherent/Basic.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/Init.lean,Mathlib/ModelTheory/Algebra/Ring/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Basic.lean,Mathlib/ModelTheory/Basic.lean,Mathlib/ModelTheory/Graph.lean,Mathlib/ModelTheory/Order.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Util/Notation3.lean	15	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	83-10372 2 months ago	83-10373 2 months ago	0-1 1 second
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/)	new-contributor merge-conflict	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	83-6498 2 months ago	105-68820 3 months 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/)	t-ring-theory merge-conflict	140/23	Mathlib/RingTheory/Valuation/ValuativeRel.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	83-6452 2 months ago	83-6452 2 months ago	7-4998 7 days
26015	linesthatinterlace author:linesthatinterlace	feat: Add high-level generalizations from `MonoidHom` lifts	This PR continues the work from #25296. Original PR: https://github.com/leanprover-community/mathlib4/pull/25296	migrated-from-branch t-algebra merge-conflict label:t-algebra$	1251/156	Mathlib/Algebra/Category/Ring/FinitePresentation.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Hom/Basic.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Polynomial/Div.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Algebra/Ring/Hom/Basic.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/NumberTheory/DirichletCharacter/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean	12	3	['github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace']	nobody	82-54755 2 months ago	82-54755 2 months ago	17-68720 17 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/)	new-contributor merge-conflict	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	82-54730 2 months ago	105-68821 3 months ago	7-62439 7 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/)	migrated-from-branch large-import t-meta merge-conflict	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	4	['edegeltje', 'github-actions', 'mathlib4-merge-conflict-bot']	joneugster assignee:joneugster	81-58566 2 months ago	92-26323 3 months ago	11-83928 11 days
25889	plp127 author:plp127	fix(Tactic/Widget/Conv): fix various issues	Fixes various issues with the `conv?` widget. Closes #25162. ([Zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bug.20in.20.60conv.3F.60)) Specifically, fixes issues with `conv?` where - when converting a `SubExpr.Pos` to conv directions, it always uses the goal expression as reference, even when working on a hypothesis, this often leads to bad results and makes it unusable on hypotheses - it refuses to go all the way in to a function (for example in `Nat.succ 0`, you can't access `Nat.succ`) - it refuses to enter binders where the name of the bound variable contains the character `0` (try it on `∀ (x0 : Nat), x0 = x0`) - it panics if it can't find a binder name instead of just coming up with one itself, this also means usually you can't enter either side of a non-dependent arrow since those usually don't have binder names (try it on `False → False`) - you can't enter the type of a binder, you end up going into the body instead (try it on `fun (x : False) => (x.elim : False → Nat) x.elim`) - you can't partially enter a function, you end up going to the top argument after instead (for example, in the expression `id (id id) 0`, when you click on `id (id id)`, you end up going to `id id`) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	419/84	Mathlib/Tactic/Widget/Conv.lean,MathlibTest/conv?.lean	2	5	['bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127']	bryangingechen and kmill assignee:kmill assignee:bryangingechen	81-43023 2 months ago	81-43024 2 months ago	70-58775 70 days
28933	artie2000 author:artie2000	WIP chore(Data): correct definition for `single_apply`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	101/98	Counterexamples/DirectSumIsInternal.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/DFinsupp/Sigma.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/SMul.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Basis/Prod.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/StdBasis.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean	31	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	79-26524 2 months ago	79-26525 2 months ago	0-75271 20 hours
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/)	t-ring-theory merge-conflict WIP	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	78-57311 2 months ago	78-57312 2 months ago	14-30610 14 days
28708	sjh227 author:sjh227	feat (Data) : edit DoublyStochastic, add Stochastic to matrix	edit DoublyStochastic add Stochastic --- Add the file Stochastic to matrix. Edit DoublyStochastic so that it depends on Stochastic along with a new lemma	t-data new-contributor merge-conflict	249/1	Mathlib.lean,Mathlib/Data/Matrix/DoublyStochastic.lean,Mathlib/Data/Matrix/Stochastic.lean	3	26	['github-actions', 'j-loreaux', 'mathlib4-merge-conflict-bot', 'sjh227']	nobody	78-45442 2 months ago	78-45442 2 months ago	0-78027 21 hours
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/)	t-algebra merge-conflict please-adopt WIP label:t-algebra$	588/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean	3	115	['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	78-28451 2 months ago	78-28452 2 months ago	181-72917 181 days
27785	staroperator author:staroperator	chore(Algebra/Group/Submonoid): golf `Nat.addSubmonoidClosure_one` using `simp`	This should improve the proof readability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict label:t-algebra$	8/15	Mathlib/Algebra/Group/Submonoid/Membership.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/Order/Star/Basic.lean	3	9	['github-actions', 'joneugster', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	joneugster assignee:joneugster	78-11793 2 months ago	78-11794 2 months ago	26-34065 26 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/)	t-meta merge-conflict	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	78-11664 2 months ago	78-11665 2 months ago	16-54453 16 days
26097	adomani author:adomani	dev: the relative linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author WIP	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	77-10360 2 months ago	77-10361 2 months ago	0-0 0 seconds
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	large-import t-analysis merge-conflict WIP	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	n/a	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	76-30198 2 months ago	unknown	unknown
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/)	large-import t-analysis awaiting-CI merge-conflict WIP	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	76-30197 2 months ago	76-30198 2 months ago	0-0 0 seconds
28743	vihdzp author:vihdzp	refactor: `Ordinal.IsNormal` → `Order.IsNormal`	We deprecate `Ordinal.IsNormal` in favor of the more general `Order.IsNormal`. --- - [ ] depends on: #28740 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	280/156	Mathlib.lean,Mathlib/Order/IsNormal.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Enum.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/SetTheory/Ordinal/Veblen.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Order/IsNormal.lean	12	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	75-29716 2 months ago	75-29718 2 months ago	0-0 0 seconds
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/)	infinity-cosmos t-category-theory merge-conflict awaiting-author	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	73-73170 2 months ago	73-73171 2 months ago	19-77946 19 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/)	t-algebra RFC merge-conflict WIP 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	73-8137 2 months ago	73-8137 2 months 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	awaiting-zulip slow-typeclass-synthesis t-algebra t-analysis merge-conflict 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	72-25665 2 months ago	72-25666 2 months ago	0-20585 5 hours
26603	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/FixedPoint): redefine `Ordinal.deriv`	We previously defined the [ordinal derivative](https://en.wikipedia.org/wiki/Normal_function#Properties) of a function as the unique normal function satisfying `deriv f 0 = nfp f 0` and `deriv f (o + 1) = nfp f (deriv f o)` (where `nfp f a` is the next fixed point of `f` that's `≥ a`). The motivation here was to give a "nice" junk value on non-normal functions (the derivative is normal no matter what). However, in practice, this definition makes it unwieldy to prove things, by either requiring a tedious zero/successor/limit argument, or requiring one to rewrite `deriv f = enumOrd (fixedPoints f)`. We can instead define `deriv f = enumOrd (fixedPoints f)`. At the cost of giving "worse" junk values (which we have no legitimate uses of), we're able to much more easily prove all the expected properties in the standard case where `f` is a normal function. Finally, we do some drive-by API cleanup. --- The GitHub diff is a bit messy, I made my best to clean it up. Moved from #21858. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	173/200	Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	72-11353 2 months ago	72-11354 2 months ago	12-50686 12 days
25662	erdOne author:erdOne	chore: redefine `LocalizedModule`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	196/228	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	14	['erdOne', 'eric-wieser', 'github-actions', 'kckennylau', 'leanprover-bot', 'leanprover-community-bot-assistant', 'vihdzp']	nobody	72-8077 2 months ago	72-8760 2 months ago	45-34308 45 days
27566	wwylele author:wwylele	feat(Data/Real): Archimedean.embedReal is a ring hom when M is an ordered ring	Also shows that this ends up the same as `LinearOrderedField.inducedOrderRingHom` for fields --- This is a spin-off from #27268 ~~because I got bored~~ . This is not in a high priority as I don't need it for anything yet, but the last lemma shows that `embedReal` is a generalization of `LinearOrderedField.inducedOrderRingHom` (which is only stated for field, and I didn't find when I was making the group embedding). Perhaps we should refactor `Mathlib/Algebra/Order/CompleteField.lean` with the definition here. Indeed, if we replace every `ℝ` with `(R : Type*)[ConditionallyCompleteLinearOrderedField R]` in `Data/Real/Embedding.lean`, the proof still works. What do you think? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict	220/3	Mathlib/Data/Real/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	69-4783 2 months ago	69-4784 2 months ago	40-32085 40 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	t-computability merge-conflict awaiting-author	120/0	Mathlib/Computability/Halting.lean	1	13	['YaelDillies', 'github-actions', 'iehality', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	66-77728 2 months ago	66-77729 2 months ago	9-70671 9 days
12143	adomani author:adomani	feat: generic linter, absorbing `cdot` linter and `attribute [instance] in` linter	A "generic" syntax linter that can be configured using a function `Syntax → Array Syntax`. The expectations is that the function returns sub-syntax extracted from the input that should be flagged by the linter. This PR provides two examples. * Flags uses of `cdot` that are not typed as `·`. * #12137 is a PR that inspired this one. * Flag uses of `attribute [instance] in` that is not limited to the next declaration * Inspired by the existing PR by Michael Rothgang #13190 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict	210/2	Mathlib.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/NumberTheory/LegendreSymbol/AddCharacter.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/GenericSyntaxLinter.lean,test/GenericSyntaxLinter.lean	7	19	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	66-66317 2 months ago	458-54452 1 year ago	41-49960 41 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/)	t-category-theory merge-conflict	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	66-58010 2 months ago	66-58011 2 months 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/)	t-category-theory merge-conflict	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	66-53049 2 months ago	66-53837 2 months 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/)	t-category-theory merge-conflict	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	65-66900 2 months ago	66-53834 2 months ago	0-1 1 second
28411	zcyemi author:zcyemi	feat(LinearAlgebra/AffineSpace/Simplex/Centroid): define centroid and medians	--- This file proves several lemmas involving the centroids and medians of a simplex in affine space. definitions: - `centroid` is the centroid of a simplex, defined as abbreviation of the `Finset.univ.centroid`. - `faceOppositeCentroid` is the centroid of the facet obtained as `(Simplex.faceOpposite i).centroid` - `median` is the line connecting a vertex to the faceOppositeCentroid. Main Results: - Commandino's theorem - The medians of a simplex are concurrent at the centroid - [ ] depends on #29128	large-import t-algebra merge-conflict label:t-algebra$	463/5	Mathlib/Geometry/Euclidean/MongePoint.lean,Mathlib/Geometry/Euclidean/Simplex.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Centroid.lean,docs/1000.yaml	5	9	['github-actions', 'jsm28', 'mathlib4-merge-conflict-bot', 'zcyemi']	nobody	65-60885 2 months ago	65-60886 2 months ago	25-79919 25 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 ---	new-contributor t-logic merge-conflict	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	65-60761 2 months ago	65-60762 2 months ago	21-3001 21 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/)	t-order merge-conflict WIP	35/0	Mathlib/RingTheory/HahnSeries/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	65-37141 2 months ago	65-37142 2 months ago	31-47622 31 days
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/)	t-category-theory merge-conflict WIP	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	64-30085 2 months ago	64-30086 2 months ago	0-0 0 seconds
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/)	t-data merge-conflict	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	64-13727 2 months ago	64-13728 2 months ago	4-31215 4 days
29499	chrisflav author:chrisflav	feat(CategoryTheory/Sites): sheafification via hypercovers	This is very much WIP, but I need a fresh cache. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	2121/1	Mathlib.lean,Mathlib/CategoryTheory/Sites/HomotopyOneHypercover.lean,Mathlib/CategoryTheory/Sites/Hypercover/Refinement.lean,Mathlib/CategoryTheory/Sites/Hypercover/Sheafification.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean,Mathlib/CategoryTheory/Sites/ZeroHypercover.lean	6	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	63-70633 2 months ago	63-70634 2 months ago	0-0 0 seconds
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/)	large-import t-data merge-conflict	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	63-28746 2 months ago	63-70635 2 months ago	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/)	large-import merge-conflict WIP	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	62-34068 2 months ago	244-85678 7 months 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/)	t-data merge-conflict	459/212	Mathlib/Data/Ordmap/Ordnode.lean	1	4	['eric-wieser', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	62-11394 2 months ago	62-11395 2 months 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/)	large-import awaiting-CI t-meta merge-conflict	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	61-60052 2 months ago	61-60053 2 months ago	0-260 4 minutes
29633	sgouezel author:sgouezel	Just for bench	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1046/690	.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/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/Normed/Module/Basic.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,MathlibTest/toAdditive.lean,lake-manifest.json	103	1	['sgouezel']	nobody	60-82036 1 month ago	60-82088 1 month ago *	0-0 0 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/)	t-algebraic-geometry merge-conflict awaiting-author	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	60-49269 1 month ago	60-49269 1 month ago	100-22151 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/)	t-algebraic-geometry merge-conflict awaiting-author	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	60-49268 1 month ago	60-49268 1 month ago	90-52970 90 days
29574	JarodUW author:JarodUW	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/)	t-ring-theory new-contributor merge-conflict	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	60-12710 1 month ago	60-12711 1 month ago	3-7974 3 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	t-algebra merge-conflict awaiting-author 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	59-77562 1 month ago	59-77562 1 month 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	t-topology merge-conflict	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	59-73005 1 month ago	59-73006 1 month 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/)	t-differential-geometry merge-conflict awaiting-author	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	59-63662 1 month ago	59-63663 1 month ago	28-73015 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/)	t-order t-meta merge-conflict	14/16	Mathlib/Order/Filter/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	59-61621 1 month ago	59-61622 1 month ago	28-42873 28 days
29605	alreadydone author:alreadydone	experiment(Algebra): unbundle npow/zpow from Monoid/InvDivMonoid	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict 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	59-52256 1 month ago	59-52257 1 month ago	0-2 2 seconds
29614	sgouezel author:sgouezel	Sg test4	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2788/3328	.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/Algebra/RestrictScalars.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.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/InjSurj.lean,Mathlib/Algebra/Ring/Rat.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/CStarAlgebra/ApproximateUnit.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Classes.lean,Mathlib/Analysis/CStarAlgebra/CompletelyPositiveMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/CStarAlgebra/ContinuousLinearMap.lean,Mathlib/Analysis/CStarAlgebra/ContinuousMap.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/Unitization.lean,Mathlib/Analysis/CStarAlgebra/lpSpace.lean,Mathlib/Analysis/Calculus/BumpFunction/FiniteDimension.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/DSlope.lean,Mathlib/Analysis/Calculus/Deriv/CompMul.lean,Mathlib/Analysis/Calculus/Deriv/Inv.lean,Mathlib/Analysis/Calculus/DiffContOnCl.lean,Mathlib/Analysis/Calculus/FDeriv/Equiv.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/LineDeriv/QuadraticMap.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/Tietze.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/InnerProductSpace/Calculus.lean,Mathlib/Analysis/InnerProductSpace/Completion.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/InnerProductSpace/MulOpposite.lean,Mathlib/Analysis/InnerProductSpace/OfNorm.lean,Mathlib/Analysis/InnerProductSpace/Orthonormal.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/ProdL2.lean,Mathlib/Analysis/InnerProductSpace/Projection/Minimal.lean,Mathlib/Analysis/InnerProductSpace/Subspace.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Algebra/Spectrum.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/Analysis/Normed/Group/AddCircle.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Completion.lean,Mathlib/Analysis/Normed/Group/Constructions.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/Int.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/Normed/Group/Rat.lean,Mathlib/Analysis/Normed/Group/SemiNormedGrp.lean,Mathlib/Analysis/Normed/Group/Subgroup.lean,Mathlib/Analysis/Normed/Group/Submodule.lean,Mathlib/Analysis/Normed/Group/Ultra.lean,Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/Completion.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Order/Hom/Basic.lean,Mathlib/Analysis/Normed/Order/Hom/Ultra.lean	251	1	['sgouezel']	nobody	58-63183 1 month ago	61-81825 2 months ago *	0-0 0 seconds *
27843	JovanGerb author:JovanGerb	chore(Algebra/Order/Sub/Defs): `@[gcongr low]` for `tsub_le_tsub`	This PR explicitly lowers the `gcongr` priority of `tsub_le_tsub`. It also golfs some proofs using this `gcongr` lemma --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	33/36	Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Sub/Defs.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Degree.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Combinatorics/Hall/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Nat/Squarefree.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean,Mathlib/Topology/ContinuousMap/Polynomial.lean	14	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	58-59900 1 month ago	58-59901 1 month ago	0-0 0 seconds
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	n/a	['JovanGerb', 'leanprover-bot']	nobody	57-71807 1 month ago	unknown	unknown
29750	sgouezel author:sgouezel	Branch just before the class_abbrev core PR, just for benching	Branch just before the class_abbrev core PR, just for benching --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1041/684	.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/ContinuousFunctionalCalculus/Instances.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/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,MathlibTest/toAdditive.lean,lake-manifest.json,lakefile.lean,lean-toolchain	101	1	['sgouezel']	nobody	57-58409 1 month ago	57-58468 1 month ago *	0-0 0 seconds *
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`. --- - [ ] depends on: #26824 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	1372/19	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	57-36797 1 month ago	unknown	unknown
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/)	t-category-theory awaiting-CI merge-conflict WIP	237/0	Mathlib/CategoryTheory/Limits/Skeleton.lean	1	3	['alreadydone', 'eric-wieser', 'mathlib4-merge-conflict-bot']	nobody	57-34726 1 month ago	57-34727 1 month ago	0-0 0 seconds
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 merge-conflict label:t-algebra$	105/95	Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/FieldTheory/Minpoly/Field.lean,Mathlib/LinearAlgebra/TensorProduct/RightExactness.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/NoetherNormalization.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Topology/Algebra/Module/CharacterSpace.lean,Mathlib/Topology/ContinuousMap/Ideals.lean,Mathlib/Topology/ContinuousMap/StoneWeierstrass.lean	18	6	['chrisflav', 'erdOne', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	56-52154 1 month ago	56-52155 1 month ago	16-338 16 days
29281	plp127 author:plp127	docs: `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/)	t-data merge-conflict	2/3	Mathlib/Data/Fin/Embedding.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	53-65298 1 month ago	53-65299 1 month ago	18-38918 18 days
27972	smmercuri author:smmercuri	refactor: make `Valuation.Completion` a `def` and refactor more of `AdicValuation.lean`	This PR continues the work from #24590. Original PR: https://github.com/leanprover-community/mathlib4/pull/24590	t-algebra t-number-theory merge-conflict WIP label:t-algebra$	186/93	Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/LaurentSeries.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	5	7	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'smmercuri']	nobody	53-28615 1 month ago	53-28616 1 month ago	3-83441 3 days
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/)	t-category-theory merge-conflict awaiting-author	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	52-44291 1 month ago	52-44291 1 month ago	13-55990 13 days
25480	ocfnash author:ocfnash	feat: define a concrete model of the `𝔤₂` root system	This is a bit of an experiment to test API but it should also make it easier to prove some properties of `𝔤₂`. --- - [x] depends on: #25477 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict WIP label:t-algebra$	120/15	Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/G2.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean	3	9	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	nobody	51-91 1 month ago	51-92 1 month ago	0-1 1 second
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/)	t-group-theory merge-conflict	61/68	Mathlib/GroupTheory/Perm/Fin.lean	1	10	['JovanGerb', 'eric-wieser', 'github-actions', 'mathlib4-merge-conflict-bot', 'plp127', 'tb65536']	nobody	50-84602 1 month ago	50-84603 1 month ago	20-39203 20 days
29829	vihdzp author:vihdzp	draft: more stuff on `standardPart`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	549/10	Mathlib.lean,Mathlib/Algebra/Order/Archimedean/Class.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Data/Real/StandardPart.lean,Mathlib/Order/Quotient.lean	7	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	50-81042 1 month ago	50-81043 1 month ago	0-0 0 seconds
29118	edegeltje author:edegeltje	chore(CategoryTheory): align `refl` and `rfl` declarations in CategoryTheory	In general, theorems and declarations named `refl` take an explicit argument and prove/construct something of type `r X X`, whereas the `rfl` versions take the argument implicitly. This PR adds missing `rfl` declarations to the CategoryTheory library, and makes sure `Equivalence.refl` takes an explicit argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon t-category-theory merge-conflict awaiting-author	37/18	Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Enriched/Ordinary/Basic.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Retract.lean,Mathlib/CategoryTheory/Shift/Adjunction.lean,Mathlib/CategoryTheory/Sums/Products.lean,Mathlib/CategoryTheory/Triangulated/Adjunction.lean,Mathlib/RingTheory/Morita/Basic.lean	11	7	['Ruben-VandeVelde', 'edegeltje', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot']	TwoFX assignee:TwoFX	50-8584 1 month ago	50-8585 1 month ago	11-13051 11 days
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/)	t-algebra merge-conflict 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	50-8460 1 month ago	50-8461 1 month ago	0-0 0 seconds
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/)	new-contributor t-category-theory merge-conflict awaiting-author	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	49-60792 1 month ago	49-60793 1 month ago	0-0 0 seconds
29390	harahu author:harahu	doc(Computability): documentation improvement suggestions from Junie Pro (LLM)	I'm still in the process of self-reviewing the details here, but please shout out if there are any changes you don't like. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict	235/237	.gitignore,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean,Mathlib/Computability/ContextFreeGrammar.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/Encoding.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/MyhillNerode.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TMComputable.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Computability/Tape.lean,Mathlib/Computability/TuringDegree.lean,Mathlib/Computability/TuringMachine.lean	22	9	['github-actions', 'harahu', 'mathlib4-merge-conflict-bot']	nobody	49-14997 1 month ago	49-14998 1 month ago	0-0 0 seconds
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	48-62703 1 month ago	48-62704 1 month 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/)	t-number-theory merge-conflict	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	48-59712 1 month ago	129-59649 4 months ago	79-1228 79 days
27668	IvanRenison author:IvanRenison	feat(Analysis/InnerProductSpace): define outer product of linear maps	Co-authored-by: Jam Kabeer Ali Khan --- I'm not completely sure if this is a good addition or not, and also, I was not sure if to call the definition `outerProduct` or only `outer`. - [ ] depends on: #28350 - [ ] depends on: #28344 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	205/8	Mathlib.lean,Mathlib/Algebra/Module/LinearMap/Lemmas.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Analysis/InnerProductSpace/Positive.lean,Mathlib/Analysis/InnerProductSpace/Trace.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	10	70	['IvanRenison', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	themathqueen assignee:themathqueen	47-61542 1 month ago	47-61543 1 month ago	2-57966 2 days
12278	Rida-Hamadani author:Rida-Hamadani	feat(Combinatorics/SimpleGraph): Provide iff statements for distance equal and greater than 2	I need these lemmas to prove that Moore graphs of girth 5 are strongly regular. --- - [x] depends on: #11945 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict awaiting-author	76/0	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	3	['github-actions', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	46-61674 1 month ago	46-61675 1 month ago	1-68738 1 day
29092	zhuyizheng author:zhuyizheng	feat(MeasureTheory): add absolutely continuous functions, FTC and integration by parts	Add the ε-δ definition of absolutely continuous functions on a closed interval in ℝ. Prove Fundamental Theorem of Calculus and integration by parts for absolutely continuous functions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict awaiting-author	1376/0	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Slope.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsContFunc.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/LebesgueDifferetiationThm.lean,Mathlib/Topology/EMetricSpace/BoundedVariation.lean	7	6	['Ruben-VandeVelde', 'fpvandoorn', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	46-32860 1 month ago	46-32861 1 month ago	0-24361 6 hours
21035	mattrobball author:mattrobball	draft	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	3/3	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	5	['github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	45-75170 1 month ago	45-75170 1 month ago	0-0 0 seconds
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/)	new-contributor t-category-theory merge-conflict awaiting-author	17/0	Mathlib/CategoryTheory/Limits/Shapes/Products.lean	1	6	['chrisflav', 'github-actions', 'leanprover-community-bot-assistant', 'ppls-nd-prs', 'robin-carlier']	nobody	45-75005 1 month ago	132-7711 4 months ago	0-47665 13 hours
27214	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Shapes/Pullback/Categorical): Categorical pullback squares	In this PR, we give the definition and first basic properties of categorical pullback squares. Using our previous work on `CategoricalPullback`, we define a typeclass `CatPullbackSquare T L R B` that asserts that a given `CatCommSq T L R B` is a "pullback square": this is the data of a chosen adjoint equivalence to the canonical functor from the top left corner of the square to the categorical pulback of its leg. Using this equivalence, be derive a universal property for functors from `X`with values in the top left corner of the square: they are equivalent to `CatCommSqOver R B X`, the category of categorical commutative squares over the cospan `R, B` with top left corner `X`. We prove some coherence result for this equivalence, most notably an isomorphism that, given `S : CatCommSqOver R B X`, bundles the two commutative triangles formed by the induced functor, and the coherence between the squares that these isomorphisms satisfy: this is conveniently bundled in the data of a single isomorphisms of `CatCommSqOver R B X`. Finally, we provide a `Prop`-class `IsCatPullbackSquare` that merely asserts the existence (via `Nonempty`) of the relevant data: we show that it is tautotogically equivalent to the propopsition that the canonical functor to the categorical pullback is an equivalence. --- - [ ] depends on: #26679 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict	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	45-49794 1 month ago	45-49795 1 month ago	0-5521 1 hour
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/)	bench-after-CI t-algebra awaiting-CI merge-conflict label:t-algebra$	54/42	Mathlib/Algebra/Module/Submodule/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	45-12828 1 month ago	45-12828 1 month ago	0-0 0 seconds
26466	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): the canonical monoid object in the augmented simplex category	Show that in the augmented simplex category, `⦋0⦌` is an internal monoid object. Future work will show that this is in fact the universal monoid object: for any monoidal category `C`, evaluation at `⦋0⦌` induces an equivalence of categories between `Mon_ C` and the category of monoidal functors from `AugmentedSimplexCategory` to `C`. The resulting augmented cosimplicial object one gets from this construction is sometimes called the "monoidal bar construction" attached to a monoid. This PR was split from #25743. --- - [ ] depends on: #25743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology t-category-theory merge-conflict	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	44-69196 1 month ago	44-69198 1 month 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	44-35563 1 month ago	44-35564 1 month ago	0-2 2 seconds
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/)	large-import t-category-theory merge-conflict	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	43-72421 1 month ago	43-75393 1 month ago	0-625 10 minutes
27970	smmercuri author:smmercuri	feat: collections of distinct infinite places contain values that diverge around 1	This PR continues the work from #22147. Original PR: https://github.com/leanprover-community/mathlib4/pull/22147 --- - [ ] depends on: #27969	FLT t-algebra t-number-theory merge-conflict WIP label:t-algebra$	461/44	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/Ostrowski.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	43-70675 1 month ago	43-70678 1 month ago	0-2827 47 minutes
25042	alreadydone author:alreadydone	feat(Topology): restriction/extension of Trivialization and composition with Homeomorph	--- - [x] depends on: #25041 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	148/2	Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/Maps/Basic.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	42-74865 1 month ago	42-74866 1 month ago	134-68375 134 days
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/)	t-differential-geometry merge-conflict WIP	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	42-74308 1 month ago	42-74309 1 month ago	0-0 0 seconds
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/)	file-removed merge-conflict	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	41-67734 1 month ago	41-67735 1 month ago	6-26396 6 days
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/)	t-category-theory merge-conflict WIP	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	41-55535 1 month ago	41-55536 1 month ago	0-10 10 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	t-order t-algebra merge-conflict 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	n/a	['YaelDillies', 'astrainfinita', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	kbuzzard assignee:kbuzzard	40-54136 1 month ago	unknown	unknown
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/)	t-ring-theory t-topology merge-conflict WIP	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	39-69859 1 month ago	39-69859 1 month ago	0-331 5 minutes
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	file-removed t-analysis merge-conflict WIP	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	39-48444 1 month ago	102-76726 3 months ago	5-43696 5 days
25992	Multramate author:Multramate	feat(RingTheory/Ideal/Span): add pair lemmas	This PR continues the work from #25323. Original PR: https://github.com/leanprover-community/mathlib4/pull/25323	t-ring-theory merge-conflict awaiting-author	131/31	Mathlib/Algebra/Module/PID.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Span.lean	5	10	['Multramate', 'Ruben-VandeVelde', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	38-45405 1 month ago	38-45407 1 month ago	39-76045 39 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	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	36-76065 1 month ago	36-76066 1 month ago	25-78230 25 days
29241	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Orthogonal): add duplicates for `ClosedSubmodule`	add duplicates of definitions and API's for `ClosedSubmodule` in an `InnerProductSpace`. motivation: when one considers a Hilbert space (`CompleteSpace`), it is more natural to consider `ClosedSubmodule`s. They form a complete lattice and satisfy `sup_orthogonal` #29243. - [x] depends on: #29230 for `Lattice` `CompleteLattice`	merge-conflict awaiting-author	191/0	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean	1	8	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'yoh-tanimoto']	sgouezel assignee:sgouezel	36-60797 1 month ago	36-60798 1 month ago	12-74361 12 days
16239	Rida-Hamadani author:Rida-Hamadani	feat(Geometry/Manifold): orientable manifolds	This module defines orientable manifolds. [This](https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Orientable.20Surface) Zulip topic is related. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author	376/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	40	['Rida-Hamadani', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot', 'ocfnash']	nobody	36-58250 1 month ago	36-58251 1 month ago	5-70530 5 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	new-contributor t-category-theory merge-conflict	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	34-51206 1 month ago	34-51208 1 month ago	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/)	new-contributor t-measure-probability merge-conflict awaiting-author	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	34-50056 1 month ago	36-62526 1 month 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/)	file-removed 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', 'mathlib4-merge-conflict-bot']	nobody	34-42063 1 month ago	34-42064 1 month ago	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/)	dependency-bump merge-conflict	3/3	lake-manifest.json,lakefile.lean	2	11	['JLimperg', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot']	nobody	34-30964 1 month ago	34-42066 1 month ago	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	2	['JLimperg', 'leanprover-bot']	nobody	34-24168 1 month ago	34-26363 1 month ago	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	33-54545 1 month ago	33-60663 1 month ago	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	33-50026 1 month ago	33-52744 1 month ago	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	33-30905 1 month ago	33-33034 1 month ago	0-0 0 seconds
22657	Xmask19 author:Xmask19	feat: a graph is maximally acyclic iff it is a tree	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	7	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	b-mehta assignee:b-mehta	33-30244 1 month ago	33-30245 1 month ago	208-19611 208 days
27445	erdOne author:erdOne	chore(RingTheory/LocalRing): fix problematic instance	We shouldn't use `RingHom.toAlgebra` for `Algebra (ResidueField R) (ResidueField S)`. The smul should come from the smul field in `Algebra`. - Redefined `Algebra (ResidueField R) (ResidueField S)` via `Ideal.Quotient.algebraOfLiesOver`, and provided missing `IsScalarTower` instances for it. - Added missing `IsScalarTower` for `Localization.AtPrime`. - Removed `Algebra p.ResidueField q.ResidueField` and the `IsScalarTower` instances coming with it (because there are `inferInstance` now) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	23/36	Mathlib/Algebra/Order/Archimedean/Submonoid.lean,Mathlib/RingTheory/LocalRing/ResidueField/Basic.lean,Mathlib/RingTheory/LocalRing/ResidueField/Ideal.lean,Mathlib/RingTheory/LocalRing/ResidueField/Instances.lean,Mathlib/RingTheory/Unramified/LocalRing.lean	5	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	32-56391 1 month ago	32-56392 1 month ago	15-61270 15 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/)	t-ring-theory merge-conflict	172/0	Counterexamples.lean,Counterexamples/DiscreteTopologyWithNontrivialValuation.lean	2	n/a	['github-actions', 'grunweg', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	32-56267 1 month ago	unknown	unknown
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) --- - [x] depends on: #24411 - [x] depends on: #24382 - [ ] depends on: #25971 - [x] depends on: #13539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	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	n/a	['callesonne', 'chrisflav', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'yuma-mizuno']	nobody	32-56243 1 month ago	unknown	unknown
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/)	t-category-theory merge-conflict awaiting-author	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	32-53005 1 month ago	40-31690 1 month ago	0-9063 2 hours
9273	grunweg author:grunweg	feat: extended charts are local diffeomorphisms on their source	--- XXX: is this PR worth keeping, given [isInvertible_mfderiv_extChartAt?](https://leanprover-community.github.io/mathlib4_docs/find/?pattern=isInvertible_mfderiv_extChartAt%3F#doc) shows that extended charts have invertible differential (regardless of whether they are an interior point)? Perhaps, all one should add is "the differential as an isomorphism..." TODO: I think this should hold at any interior point - as the inverse of the extended chart, restricted to the interior of its source, will be a local inverse. The analogous result for un-extended charts is shown in #8160. Unresolved questions - are all the tiny API lemmas useful; are any more missing? - do I want similar results for `extChartAt`? (In any case, they are easy to deduce.) - [ ] depends on: #8738 for simplicity [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict awaiting-author	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	31-79214 1 month ago	unknown	unknown
29120	eric-wieser author:eric-wieser	feat: add a typeclass for the indiscrete topology	Notably, this changes the assumptions of `theorem ContinuousLinearMap.norm_id : ‖id 𝕜 E‖ = 1` from `[NormedAddCommGroup E] [Nontrivial E]` to the more general `[SeminormedAddCommGroup E] [NontrivialTopology E]`. I've skipped the deprecations since #28102 hasn't made it to any release yet. As discussed in [#Is there code for X? > Typeclass for nontrivial topology @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Typeclass.20for.20nontrivial.20topology/near/533192558) and [#Is there code for X? > Typeclass for indiscrete topology @ 💬](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Typeclass.20for.20indiscrete.20topology/near/512174181) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict	250/76	Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Module/RCLike/Real.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Analysis/Normed/Operator/NormedSpace.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/Maps/Basic.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sheaves/PUnit.lean	14	5	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	31-53566 1 month ago	31-53567 1 month ago	44-45896 44 days
4109	kim-em author:kim-em	feat: run library_search when the cursor is at a sorry	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict	77/0	Mathlib.lean,Mathlib/Data/Nondet/Basic.lean,Mathlib/Tactic/Common.lean,Mathlib/Tactic/LibrarySearch.lean,Mathlib/Util/CodeAction/RunTactic.lean	5	1	['euprunin']	nobody	31-4989 1 month ago	679-15925 1 year ago	0-0 0 seconds
15045	Command-Master author:Command-Master	fix(LinearAlgebra/Alternating/Basic): fix `MultilinearMap.alternatization`	See https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/kernel.20deep.20recursion.20detected. Fix ```lean import Mathlib.LinearAlgebra.Determinant example : (1 : Matrix (Fin 8) (Fin 8) ℚ).det = 1 := by rw [Matrix.det_one] ``` causing a `(kernel) deep recursion detected` error. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	51/21	Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,test/DetOne.lean	3	13	['Command-Master', 'PatrickMassot', 'dwrensha', 'eric-wieser', 'github-actions', 'grhkm21', 'grunweg', 'kbuzzard', 'kim-em']	nobody	30-35890 30 days ago	310-80605 10 months ago	0-8789 2 hours
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	large-import t-analysis merge-conflict WIP	377/3	Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/UniformSpace/Cauchy.lean	4	n/a	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	30-25674 30 days ago	unknown	unknown
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/)	t-analysis merge-conflict	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	30-12703 30 days ago	30-12704 30 days ago	0-14664 4 hours
21853	smmercuri author:smmercuri	feat: the adele ring of a number field is locally compact	--- - [ ] depends on: #21158 - [ ] depends on: #21847 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict WIP	398/3	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Group/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	29-63129 29 days ago	29-63132 29 days ago	0-0 0 seconds
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/)	t-algebra t-number-theory awaiting-CI merge-conflict WIP 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	29-57843 29 days ago	29-57844 29 days ago	0-28 28 seconds
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/)	file-removed awaiting-zulip merge-conflict	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	29-2875 29 days ago	29-2876 29 days ago	0-1 1 second
30248	dwrensha author:dwrensha	chore: remove obsolete NormDigits namespace	In Lean 3, `nat.digits m n` with concrete numbers `m` `n` could be normalized via `norm_num`. [The logic enabling that](https://github.com/leanprover-community/mathlib3/blob/65a1391a0106c9204fe45bc73a039f056558cb83/src/data/nat/digits.lean#L599-L678) was partially ported over to Lean 4 in the `NormDigits` namespace, but never was completed. Independently, simprocs as introduced in Lean v4.6.0 made it so that `simp [Nat.digits, Nat.digitsAux]` could normalize `Nat.digits m n` without any need for the special `NormDigits` code. More recently, #25864 made it so that just plain `rfl` can normalize `Nat.digits m n` (but note that a revert PR has been proposed in #30246). Therefore, the `NormDigits` namespace is no longer relevent and should be deleted. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	0/102	Mathlib/Data/Nat/Digits/Defs.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	27-45426 27 days ago	27-45426 27 days ago	12-698 12 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/)	t-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	23/8	Mathlib/FieldTheory/AbsoluteGaloisGroup.lean,Mathlib/FieldTheory/KrullTopology.lean	2	4	['acmepjz', 'alreadydone', 'github-actions']	nobody	26-83046 26 days ago	272-58878 8 months 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/)	t-category-theory awaiting-CI merge-conflict WIP	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	26-76831 26 days ago	27-32784 27 days ago	0-1 1 second
28126	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology/FundamentalGroupoid): relate equality in fundamental groupoid to homotopy	Prove the theorem `fromPath_eq_iff_homotopic` which shows that two paths are equal in the fundamental groupoid if and only if they are homotopic. Also add simp lemmas `fromPath_refl`, `fromPath_symm`, and `fromPath_trans`. Together, these allow one to prove two paths are homotopic by transferring to the fundamental groupoid and using the `aesop_cat` tactic. --- I would like to thank Kenny Lau for inspiring this code on Zulip at [#Is there code for X? > Using aesop_cat to prove paths are homotopic](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Using.20aesop_cat.20to.20prove.20paths.20are.20homotopic). Also, I would like to note that I am a newcomer when it comes to contributing to Mathlib, and that this code was written as a part of a formalization project at the University of Western Ontario under the supervision of Chris Kapulkin and Daniel Carranza (which is happening through the Fields Undergraduate Summer Research Program). - [ ] depends on: #28234 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author	121/141	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/FundamentalGroup.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/InducedMaps.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/Topology/Covering.lean,Mathlib/Topology/Homotopy/HomotopyGroup.lean,Mathlib/Topology/Homotopy/Product.lean	8	11	['Sebi-Kumar', 'alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mattrobball']	mattrobball assignee:mattrobball	26-44388 26 days ago	26-44389 26 days ago	14-30316 14 days
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/)	t-data merge-conflict	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	26-5010 26 days ago	26-5012 26 days ago	0-0 0 seconds
30642	thorimur author:thorimur	bench: lean4#10832		large-import merge-conflict	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	25-51220 25 days ago	27-4243 27 days ago *	0-0 0 seconds *
30643	thorimur author:thorimur	bench: before lean4#10832		large-import merge-conflict	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	25-51219 25 days ago	27-3191 27 days ago *	0-0 0 seconds *
30271	artie2000 author:artie2000	chore: "weaken" typeclasses for totally ordered fields	* `[Field K] [LinearOrder K] [IsStrictOrderedRing K]` --> `[Field K] [LinearOrder K] [IsOrderedRing K]` This spelling is more natural as long as perf costs aren't too great --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI t-meta merge-conflict	196/195	Mathlib/Algebra/ContinuedFractions/Computation/ApproximationCorollaries.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/Computation/TerminatesIffRat.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Archimedean/Hom.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/CauSeq/Completion.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Algebra/Order/Field/Pointwise.lean,Mathlib/Algebra/Order/Field/Power.lean,Mathlib/Algebra/Order/Field/Subfield.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Group/Pointwise/Interval.lean,Mathlib/Algebra/Order/Module/Pointwise.lean,Mathlib/Algebra/Order/Module/Rat.lean,Mathlib/Algebra/Order/Nonneg/Field.lean,Mathlib/Algebra/Order/Positive/Field.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/DenomsClearable.lean,Mathlib/Algebra/QuadraticDiscriminant.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean,Mathlib/Analysis/Asymptotics/SuperpolynomialDecay.lean,Mathlib/Analysis/Convex/Basic.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Analysis/Convex/Birkhoff.lean,Mathlib/Analysis/Convex/Caratheodory.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convex/Gauge.lean,Mathlib/Analysis/Convex/Independent.lean,Mathlib/Analysis/Convex/Jensen.lean,Mathlib/Analysis/Convex/Join.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Side.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Convex/Star.lean,Mathlib/Analysis/Convex/StoneSeparation.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Analysis/Convex/Visible.lean,Mathlib/Analysis/Normed/Order/Basic.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/Polynomial/Basic.lean,Mathlib/Analysis/SpecificLimits/Basic.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/LapMatrix.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Energy.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Tripartite.lean,Mathlib/Data/NNRat/Floor.lean,Mathlib/Data/Rat/Cast/Lemmas.lean,Mathlib/Data/Rat/Cast/Order.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/Geometry/Convex/Cone/Basic.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Ordered.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Order/Filter/AtTopBot/Archimedean.lean,Mathlib/Order/Filter/AtTopBot/Field.lean,Mathlib/Order/Interval/Set/IsoIoo.lean,Mathlib/Tactic/CancelDenoms/Core.lean,Mathlib/Topology/Algebra/Field.lean,Mathlib/Topology/Algebra/InfiniteSum/Order.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean,Mathlib/Topology/Algebra/Order/Archimedean.lean,Mathlib/Topology/Algebra/Order/Field.lean,Mathlib/Topology/Algebra/Order/Floor.lean,Mathlib/Topology/Algebra/Polynomial.lean,Mathlib/Topology/Instances/AddCircle/Defs.lean,Mathlib/Topology/UniformSpace/AbsoluteValue.lean,Mathlib/Topology/UnitInterval.lean,MathlibTest/InstanceTransparency.lean,MathlibTest/apply_rules.lean,MathlibTest/cancel_denoms.lean,MathlibTest/linarith.lean,MathlibTest/module.lean,MathlibTest/norm_num.lean,MathlibTest/norm_num_ext.lean,MathlibTest/positivity.lean	102	5	['YaelDillies', 'artie2000', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	24-60483 24 days ago	24-60484 24 days ago	13-82028 13 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/)	t-algebra merge-conflict 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	22-13688 22 days ago	22-13689 22 days ago	165-29512 165 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 merge-conflict delegated	118/3	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	18	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	21-81171 21 days ago	21-81172 21 days ago	15-14325 15 days
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/)	t-data merge-conflict	53/48	Mathlib/Data/Nat/Prime/Defs.lean	1	3	['digama0', 'github-actions', 'leanprover-community-bot-assistant']	nobody	21-66285 21 days ago	132-7569 4 months ago	8-58125 8 days
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/)	t-data merge-conflict	29/9	Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Operations.lean	2	5	['dupuisf', 'euprunin', 'github-actions', 'mathlib4-merge-conflict-bot']	nobody	21-51377 21 days ago	21-51378 21 days ago	84-66723 84 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	t-order merge-conflict	377/8	Mathlib.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublocale.lean,Mathlib/Order/Synonym.lean,docs/references.bib	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-45123 21 days ago	94-2999 3 months ago	0-1908 31 minutes
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/)	t-analysis merge-conflict	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	21-42760 21 days ago	21-42761 21 days ago	48-80227 48 days
30773	JovanGerb author:JovanGerb	reorder inheritance for Normed*	This PR changes order in which the parents to some `Normed*` classes are declared. Hopefully this can show a performance improvement. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	bench-after-CI merge-conflict	46/47	Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Field/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Operator/Basic.lean,Mathlib/Analysis/Normed/Operator/NormedSpace.lean,Mathlib/Analysis/Normed/Ring/Basic.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/Compact.lean	10	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	21-41783 21 days ago	21-41784 21 days ago	0-0 0 seconds
22037	EtienneC30 author:EtienneC30	issues with Finset subtype coercion	[Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Finset.20subtype.20changes) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	7/1	Mathlib/Data/Finset/Defs.lean,Mathlib/MeasureTheory/Constructions/Projective.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	20-66463 20 days ago	20-66464 20 days ago	0-0 0 seconds
30622	kim-em author:kim-em	feat: replace some tauto with grind	This PR replaces an initial segment of `tauto` calls with `grind`; for now this is just a benchmarking experiment.	merge-conflict	36/36	Archive/Examples/Kuratowski.lean,Archive/Imo/Imo2001Q3.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/CubicDiscriminant.lean,Mathlib/Algebra/Group/Int/Units.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/GroupWithZero/Indicator.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCofiber.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Lie/Derivation/AdjointAction.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Polynomial/Homogenize.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Algebra/Ring/NegOnePow.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/ValuativeCriterion.lean,Mathlib/AlgebraicTopology/DoldKan/NReflectsIso.lean,Mathlib/AlgebraicTopology/SimplicialSet/Simplices.lean,Mathlib/AlgebraicTopology/TopologicalSimplex.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean	28	5	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	20-32853 20 days ago	20-32854 20 days ago	0-0 0 seconds
29514	grunweg author:grunweg	More strict mode	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict WIP	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	19-64231 19 days ago	19-64231 19 days ago	0-1 1 second
30218	EtienneC30 author:EtienneC30	feat: default value for aemeasurable in isProbabilityMeasure_map	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	5/4	Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/Probability/CDF.lean,Mathlib/Probability/ProductMeasure.lean	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	18-79646 18 days ago	18-79646 18 days ago	0-0 0 seconds
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 awaiting-author documentation	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	18-77342 18 days ago	18-77342 18 days ago	0-61617 17 hours
23600	mattrobball author:mattrobball	perf(Quiver.Basic): make `IsThin` a `class`	It seems problematic that `Quiver.IsThin` is an `abbrev` for (essentially) `Subsingleton`. We turn it in a one-field class. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict delegated	27/21	Mathlib/CategoryTheory/Bicategory/Coherence.lean,Mathlib/CategoryTheory/Category/Preorder.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Groupoid/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/WidePullbacks.lean,Mathlib/CategoryTheory/Limits/SmallComplete.lean,Mathlib/CategoryTheory/Monoidal/Free/Coherence.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/Combinatorics/Quiver/Basic.lean	11	17	['b-mehta', 'github-actions', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot', 'mattrobball']	nobody	17-50768 17 days ago	17-50769 17 days ago	0-5717 1 hour
28737	astrainfinita author:astrainfinita	refactor: deprecate `MulEquivClass`	This PR continues the work from #18806. Original PR: https://github.com/leanprover-community/mathlib4/pull/18806	t-algebra merge-conflict awaiting-author 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	16-79757 16 days ago	16-79757 16 days ago	4-17723 4 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/)	large-import new-contributor t-number-theory 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	16-79709 16 days ago	16-79709 16 days ago	53-41880 53 days
30421	grunweg author:grunweg	WIP: support products in the differential geometry elaborators	Nothing to see yet. Best reviewed commit by commit. --- - [ ] depends on: #30413 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1051/254	Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Lean/Meta/Basic.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean	4	4	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-74361 16 days ago	16-74363 16 days ago	0-2190 36 minutes
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/)	file-removed new-contributor t-topology merge-conflict awaiting-author	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	16-71439 16 days ago	16-71440 16 days ago	0-2409 40 minutes
30690	grunweg author:grunweg	style(Order): fix whitespace	Extracted from #30658. Found by extending the commandStart linter to proof bodies. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	69/69	Mathlib/Order/Basic.lean,Mathlib/Order/Bounds/Image.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Filter/Cocardinal.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/KonigLemma.lean,Mathlib/Order/Max.lean,Mathlib/Order/Minimal.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/PiLex.lean,Mathlib/Order/RelClasses.lean,Mathlib/Order/SetIsMax.lean,Mathlib/Order/SetNotation.lean,Mathlib/Order/WithBot.lean	14	4	['JovanGerb', 'github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	Vierkantor assignee:Vierkantor	16-70302 16 days ago	16-70303 16 days ago	8-67789 8 days
27364	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupCohomology): cohomology of finite cyclic groups	Let `k` be a commutative ring, `G` a group and `A` a `k`-linear `G`-representation. Given endomorphisms `φ, ψ : A ⟶ A` such that `φ ∘ ψ = ψ ∘ φ = 0`. Denote by `Chains(A, φ, ψ)` the periodic chain complex `... ⟶ A --φ--> A --ψ--> A --φ--> A --ψ--> A ⟶ 0` and by `Cochains(A, φ, ψ)` the periodic cochain complex `0 ⟶ A --ψ--> A --φ--> A --ψ--> A --φ--> A ⟶ ...`. When `G` is finite and generated by `g : G`, then `P := Chains(k[G], N, ρ(g) - Id)` (with `ρ` the left regular representation) is a projective resolution of `k` as a trivial representation. In this PR we show that for `A : Rep k G`, `Hom(P, A)` is isomorphic to `Cochains(A, N, ρ_A(g) - Id)` as a complex of `k`-modules, and hence the cohomology of this complex computes group cohomology. --- - [x] depends on: #27362 - [x] depends on: #27361 - [x] depends on: #27363 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	142/1	Mathlib.lean,Mathlib/RepresentationTheory/Homological/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/FiniteCyclic.lean	3	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	16-67567 16 days ago	16-67568 16 days ago	24-7427 24 days
26138	xroblot author:xroblot	Development branch (2)	---	merge-conflict WIP	187/7	Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/Sandbox.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot']	nobody	16-54760 16 days ago	unknown	unknown
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/)	large-import merge-conflict WIP	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	n/a	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	16-53148 16 days ago	unknown	unknown
28962	grunweg author:grunweg	chore: enable the flexible linter in mathlib	Let's see what has regressed in the mean-time, and how many exceptions remain. We're somewhat liberal with disabling the linter when this doesn't make sense: let's see how close we are. --- TODO: should the `bicategory` tactic be considered flexible/normalising? - [x] depends on: #29027 - [x] depends on: #29174 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	320/52	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q5.lean,Counterexamples/MapFloor.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/SpecialFunctions/PosPart.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Dialectica/Monoidal.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Limits/Constructions/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Grothendieck.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Data/Bool/Count.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/Init.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/NumberTheory/LucasLehmer.lean	126	21	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-72754 15 days ago	15-72755 15 days ago	12-57251 12 days
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	t-number-theory merge-conflict WIP	22/0	Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	15-57279 15 days ago	15-57280 15 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/)	large-import t-category-theory merge-conflict awaiting-author	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	14-15874 14 days ago	14-15874 14 days ago	78-31643 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	t-differential-geometry merge-conflict please-adopt WIP	75/6	Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean	2	3	['github-actions', 'grunweg', 'mathlib4-merge-conflict-bot']	nobody	13-74277 13 days ago	13-74278 13 days ago	0-74 1 minute
30718	kim-em author:kim-em	experiment: merge rewrites		t-meta merge-conflict	9/5	Mathlib/Tactic/TacticAnalysis/Declarations.lean,lakefile.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	13-72956 13 days ago	13-72957 13 days ago	0-0 0 seconds
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/)	t-algebra merge-conflict 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	13-63013 13 days ago	13-63014 13 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	13-59514 13 days ago	13-59515 13 days ago	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	13-58817 13 days ago	13-58818 13 days ago	8-85332 8 days
29508	zhuyizheng author:zhuyizheng	feat(MeasureTheory): FTC and integration by parts for absolutely continuous functions	Prove Fundamental Theorem of Calculus and integration by parts for absolutely continuous functions. Part of originally planned #29092. --- - [ ] depends on: #29503 - [ ] depends on: #29507 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability merge-conflict	892/0	Mathlib.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AbsolutelyContinuous.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/AbsContFunc.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/DerivIntegrable.lean	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	13-48997 13 days ago	13-48998 13 days ago	0-0 0 seconds
29435	sgouezel author:sgouezel	WIP: typeclass experiment	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	33/7	Mathlib/Algebra/QuadraticAlgebra.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/GroupTheory/GroupAction/Hom.lean	3	6	['eric-wieser', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'sgouezel']	nobody	12-57425 12 days ago	12-57426 12 days ago	0-1 1 second
26259	Raph-DG author:Raph-DG	feat(Topology): Connecting different notions of locally finite	In this PR we connect the notions of local finiteness of an indexed family of sets (as in LocallyFinite) and of a set of sets (as in Function.locallyFinsuppWithin) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author	30/0	Mathlib/Topology/LocallyFinsupp.lean	1	22	['Raph-DG', 'chrisflav', 'github-actions', 'jcommelin', 'kckennylau', 'mathlib4-merge-conflict-bot', 'urkud']	j-loreaux assignee:j-loreaux	10-67255 10 days ago	10-67255 10 days ago	118-44502 118 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/)	t-ring-theory merge-conflict awaiting-author	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	10-58537 10 days ago	10-58538 10 days ago	63-50556 63 days
31070	EtienneC30 author:EtienneC30	feat: independence via bounded continuous functions	--- - [x] depends on: #31021 - [ ] depends on: #31050 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-measure-probability merge-conflict	849/71	Mathlib.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/AEStronglyMeasurable.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/IntegrableOn.lean,Mathlib/MeasureTheory/Measure/HasOuterApproxClosedProd.lean,Mathlib/MeasureTheory/Measure/Real.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Independence/BoundedContinuousFunction.lean,Mathlib/Probability/Independence/Process.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean	11	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-42090 10 days ago	10-42093 10 days ago	0-0 0 seconds
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	10-40938 10 days ago	10-40940 10 days ago	62-52011 62 days
27918	kim-em author:kim-em	wip: 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	975/373	Mathlib.lean,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	57	16	['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	10-39948 10 days ago	10-39951 10 days ago	66-34137 66 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/)	t-category-theory merge-conflict WIP	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	10-37035 10 days ago	10-37036 10 days ago	0-74 1 minute
31182	fgdorais author:fgdorais	chore: adaptations for batteries#1486	After [batteries#1486](https://github.com/leanprover-community/batteries/pull/1486) is merged: - [ ] Edit the lakefile to point to leanprover-community/batteries:main - [ ] Run lake update batteries - [ ] Merge leanprover-community/mathlib4:master - [ ] Wait for CI and merge	blocked-by-batt-PR merge-conflict	31/65	Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/Multiset/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Order/BigOperators/Ring/List.lean,Mathlib/Data/List/Prime.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,MathlibTest/LibraryRewrite.lean,lake-manifest.json,lakefile.lean,scripts/noshake.json	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	10-36290 10 days ago	10-36291 10 days ago	0-11 11 seconds
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/)	sphere-packing large-import new-contributor t-analysis merge-conflict	201/0	Mathlib/Analysis/Complex/CauchyIntegral.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	10-30974 10 days ago	10-30975 10 days ago	0-0 0 seconds
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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	218/2	Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean	2	91	['EtienneC30', 'b-mehta', 'ctchou', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	10-12565 10 days ago	178-52515 5 months ago	39-67601 39 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/)	file-removed large-import t-meta merge-conflict awaiting-author	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']	robertylewis assignee:robertylewis	10-12349 10 days ago	34-68624 1 month ago *	67-54211 67 days *
29909	Vierkantor author:Vierkantor	feat(CI): add build output to CI workflows	This PR uses the Zulip build report script (originally developed for the nightly-regression-report workflow) to add a summary of build output to other Zulip posts about workflow results. This allows us to more easily see the origin of a failure. This requires redoing the script a little to make it a bit more flexible, and the output is slightly reformatted to become consistent across the various workflows (4 of them that post to Zulip). We don't do so for the nightly-testing failures, since those run in a different workflow, and it would be a lot of work to access the command output from another workflow. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI merge-conflict	93/69	.github/workflows/daily.yml,.github/workflows/nightly-docgen.yml,.github/workflows/nightly-regression-report.yml,scripts/zulip_build_report.sh	4	2	['github-actions', 'mathlib4-merge-conflict-bot']	robertylewis assignee:robertylewis	10-11175 10 days ago	10-11175 10 days ago	41-48286 41 days
31220	fgdorais author:fgdorais	chore: adaptations for batteries#1489	After [batteries#1489](https://github.com/leanprover-community/batteries/pull/1489) is merged: - [ ] Edit the lakefile to point to leanprover-community/batteries:main - [ ] Run lake update batteries - [ ] Merge leanprover-community/mathlib4:master - [ ] Wait for CI and merge	large-import blocked-by-batt-PR merge-conflict	12/35	Mathlib/Data/Array/Extract.lean,lake-manifest.json,lakefile.lean	3	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	10-10328 10 days ago	10-10329 10 days ago	0-15 15 seconds
27708	vihdzp author:vihdzp	feat: unions and intersections of ordinals are ordinals	As well as a bonus result `IsTransitive.empty_mem`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	58/16	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean	2	5	['alreadydone', 'b-mehta', 'github-actions', 'mathlib4-merge-conflict-bot', 'vihdzp']	alreadydone assignee:alreadydone	9-69693 9 days ago	9-69694 9 days ago	12-2927 12 days
26446	joelriou author:joelriou	refactor(CategoryTheory): make morphisms in full subcategories a 1-field structure	This PR refactors the definition of morphisms in full subcategories (and induced categories), by making them a 1-field structure. This prevents certain defeq abuse, and improves automation. (The only issue is that this adds an extra layer: `f` sometimes becomes `f.hom`, etc.) (It would make sense to redefine `CommGrp/Grp/CommMon` as full subcategories of `Mon`, rather than defining `CommGrp` by applying `InducedCategory` twice, which adds one unnecessary layer of `.hom`, but no attempt was made to change this in this PR.) --- (This time, I will try to complete this refactor. I very much need this for applications to homotopical algebra, where full subcategories of cofibrant/fibrant/bifibrant objects are used.) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict WIP	2002/1459	Mathlib/Algebra/Category/CommAlgCat/FiniteType.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/EssentiallySmall.lean,Mathlib/Algebra/Category/Grp/FiniteGrp.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Tannaka.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Gluing.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/Morphisms/Separated.lean,Mathlib/AlgebraicGeometry/Noetherian.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplexCategory/MorphismProperty.lean,Mathlib/AlgebraicTopology/SimplexCategory/Truncated.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ColimCoyoneda.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Subobject.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean,Mathlib/CategoryTheory/Category/TwoP.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Countable.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Filtered/Small.lean,Mathlib/CategoryTheory/FinCategory/AsType.lean,Mathlib/CategoryTheory/FintypeCat.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Galois/Decomposition.lean,Mathlib/CategoryTheory/Galois/Equivalence.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/GaloisObjects.lean,Mathlib/CategoryTheory/Galois/IsFundamentalgroup.lean,Mathlib/CategoryTheory/Galois/Prorepresentability.lean,Mathlib/CategoryTheory/Galois/Topology.lean,Mathlib/CategoryTheory/InducedCategory.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Indization/LocallySmall.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/LocallySmall.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/Braided/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/FunctorCategory.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Basic.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Internal/Types/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/MorphismProperty/IsInvertedBy.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/CommGrp_.lean,Mathlib/CategoryTheory/Simple.lean,Mathlib/CategoryTheory/Sites/Coherent/RegularSheaves.lean,Mathlib/CategoryTheory/Sites/EffectiveEpimorphic.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/SheafHom.lean,Mathlib/CategoryTheory/Sites/SheafOfTypes.lean,Mathlib/CategoryTheory/Skeletal.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Subobject/NoetherianObject.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/CategoryTheory/Subpresheaf/Subobject.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/CategoryTheory/Topos/Classifier.lean,Mathlib/Condensed/Discrete/Colimit.lean,Mathlib/Condensed/Discrete/LocallyConstant.lean,Mathlib/Condensed/Discrete/Module.lean,Mathlib/Condensed/Light/TopCatAdjunction.lean,Mathlib/Condensed/TopCatAdjunction.lean	142	8	['erdOne', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-merge-conflict-bot', 'smorel394']	nobody	9-64644 9 days ago	9-64645 9 days ago	0-2 2 seconds
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/)	t-ring-theory file-removed merge-conflict awaiting-author	438/3	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Action/Basic.lean,Mathlib/RingTheory/DiscreteValuationRing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Basic.lean,Mathlib/RingTheory/OrderOfVanishing/Properties.lean	5	18	['Raph-DG', 'erdOne', 'github-actions', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	9-44285 9 days ago	9-44285 9 days ago	33-5791 33 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/)	t-algebra merge-conflict 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	9-32865 9 days ago	9-32866 9 days ago	80-71575 80 days
29020	grunweg author:grunweg	chore: squeeze a few non-terminal simps	Founds by the flexible linter in #28962. --- - [x] depends on : #29027 - [x] depends on: #30106 - [x] depends on: #30091 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	50/25	Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Arctan.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Eval.lean,Mathlib/Tactic/NormNum/Irrational.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	20	37	['YaelDillies', 'b-mehta', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'vlad902']	nobody	9-32741 9 days ago	9-32742 9 days ago	0-1958 32 minutes
29464	harahu author:harahu	doc(AkraBazzi): corrections to docs by way of LLM	Changes are due to Junie Pro and Codex, both ChatGPT-based agents, hence warrants somewhat careful review. I've tried to review these changes myself, but my limited lean experience is felt as a limiting factor. Changes include: - Fixing typos, spelling and grammar - Changing some docstring code to LaTex math, where that seemed to be the intention - Move some descriptions between files, in cases where definitions were promised in files they weren't defined - Fix inconsistencies between docstrings and code (these need special review attention) [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.23.2029464.20corrections.20to.20docs.20by.20way.20of.20LLM/with/538427193) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	66/60	Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/AkraBazzi/SumTransform.lean	3	27	['chrisflav', 'github-actions', 'grunweg', 'harahu', 'mathlib4-merge-conflict-bot']	nobody	9-32154 9 days ago	9-32156 9 days ago	0-0 0 seconds
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/)	large-import merge-conflict	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	9-588 9 days ago	9-589 9 days ago	0-0 0 seconds
29076	yury-harmonic author:yury-harmonic	feat(BigOperators/ModEq): new file	--- - [ ] depends on: #29072 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	337/26	Mathlib.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-587 9 days ago	9-588 9 days ago	0-4560 1 hour
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/)	large-import t-algebraic-geometry merge-conflict awaiting-author	269/1	Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Topology/KrullDimension.lean,Mathlib/Topology/Sober.lean	4	37	['Raph-DG', 'chrisflav', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	erdOne assignee:erdOne	8-73909 8 days ago	10-54684 10 days ago	28-60757 28 days
30623	kim-em author:kim-em	experiment: which `tauto` can be replaced with `grind`?	This PR runs the tactic analysis linter added in #30619, so CI can compute for us which `tauto` calls can be replaced by `grind`.	t-meta merge-conflict	22/0	Mathlib/Init.lean,Mathlib/Tactic/Tauto.lean,lakefile.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	8-53145 8 days ago	8-53146 8 days ago	0-0 0 seconds
30625	kim-em author:kim-em	experiment: which `tauto` can not be replaced with `grind`?	This PR runs the tactic analysis linter added in #30619, so CI can compute for us which `tauto` calls can not be replaced by `grind`.	t-meta merge-conflict	22/0	Mathlib/Init.lean,Mathlib/Tactic/Tauto.lean,lakefile.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	8-53144 8 days ago	8-53145 8 days ago	0-0 0 seconds
30686	grunweg author:grunweg	tracking: #30658 split into pieces	--- - [x] depends on: #30685 - [x] depends on: #30687 - [x] depends on: #30688 - [x] depends on: #30689 - [x] depends on: #30762 (revert the other changes) - [x] depends on: #30691 - [x] depends on: #30778 Not meant for merging, but for me tracking the changes locally. This PR should never land directly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	2327/245	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/IsPrimePow.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/CategoryTheory/Abelian/Projective/Resolution.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Category/Cat/Terminal.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Grothendieck.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean,Mathlib/CategoryTheory/Limits/Presheaf.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Reflexive.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monad/Adjunction.lean,Mathlib/CategoryTheory/Monad/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Action/End.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Shift/Induced.lean,Mathlib/CategoryTheory/Sites/Coherent/SequentialLimit.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/CategoryTheory/Subpresheaf/Subobject.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Fin/Tuple/Curry.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/MaxPowDiv.lean,Mathlib/Data/Nat/ModEq.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/Logic/Function/FromTypes.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean	128	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-38923 8 days ago	8-38924 8 days ago	13-17060 13 days
30484	vihdzp author:vihdzp	refactor: override `≤` and `<` in `Function.Injective.semilatticeSup`, etc.	These constructors now take `LE` and `LT` instance arguments, and proofs that the "induced" relations are equal. This matches the behavior for all other data fields of the same constructors, which avoids diamonds which could otherwise arise. To recover the old behavior, you can instantiate `LE` and `LT` instances through `PartialOrder.lift` (if they don't exist already), and set the `le` and `lt` fields to `Iff.rfl`. --- I seem to have (somehow?) changed a syntactic equality on fractional ideals - given that this golfs various proofs and even removes a porting note, I think this change is desirable. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order merge-conflict	392/382	Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Analysis/Convex/Cone/Dual.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Sites/Precoverage.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Finsubgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/FieldTheory/Galois/GaloisClosure.lean,Mathlib/MeasureTheory/MeasurableSpace/MeasurablyGenerated.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/NumberTheory/NumberField/FractionalIdeal.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/CompleteBooleanAlgebra.lean,Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/CompleteLattice/Lemmas.lean,Mathlib/Order/CompleteSublattice.lean,Mathlib/Order/Concept.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/BoundedLattice.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Nucleus.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/UpperLower/CompleteLattice.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Basic.lean,Mathlib/RingTheory/DividedPowers/SubDPIdeal.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/FractionalIdeal/Inverse.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/Topology/Algebra/Group/ClosedSubgroup.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/CompactlySupported.lean,Mathlib/Topology/ContinuousMap/Ordered.lean,Mathlib/Topology/DiscreteQuotient.lean,Mathlib/Topology/Sets/Closeds.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/Sets/Opens.lean,Mathlib/Topology/Sets/Order.lean	56	32	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'plp127', 'vihdzp']	nobody	8-9956 8 days ago	8-9957 8 days ago	5-71110 5 days
29877	Komyyy author:Komyyy	feat: inner product of the gradient	Also, this PR enables the `conj` notation in the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	37/10	Mathlib/Analysis/Calculus/Gradient/Basic.lean	1	2	['github-actions', 'mathlib4-merge-conflict-bot']	hrmacbeth assignee:hrmacbeth	7-61524 7 days ago	7-61526 7 days ago	45-5432 45 days
31270	fgdorais author:fgdorais	chore: adaptations for batteries#1490	After [batteries#1490](https://github.com/leanprover-community/batteries/pull/1490) is merged: - [ ] Edit the lakefile to point to leanprover-community/batteries:main - [ ] Run lake update batteries - [ ] Merge leanprover-community/mathlib4:master - [ ] Wait for CI and merge	blocked-by-batt-PR merge-conflict	23/54	Mathlib/Algebra/Module/Torsion.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/FinRange.lean,Mathlib/Data/List/Sublists.lean,lake-manifest.json,lakefile.lean	8	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	7-60768 7 days ago	7-60769 7 days ago	0-9 9 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/)	large-import t-order merge-conflict WIP	35/0	Mathlib/Order/Preorder/Chain.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-52669 7 days ago	8-43909 8 days ago	0-466 7 minutes
26901	5hv5hvnk author:5hv5hvnk	feat: a simproc version of `compute_degree`	Wrap `compute_degree` in a simproc for use by simp. Closes #22219. ---	new-contributor awaiting-CI t-meta merge-conflict awaiting-author	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	7-50758 7 days ago	7-50759 7 days ago	2-71043 2 days
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/)	t-meta merge-conflict awaiting-author	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']	alexjbest assignee:alexjbest	7-50512 7 days ago	7-50513 7 days ago	58-77127 58 days
26174	grunweg author:grunweg	feat: split continuous linear maps	We define split linear maps and prove their basic properties. Manually migrated from #23186. --- There are two sorries left. One is `ClosedComplemented.prod`; the other relates to the composition of split maps. Help with both is welcome. [This zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Composition.20of.20immersions.20is.20an.20immersion.3A.20infinite-dimensio/with/507300190) contains a proof of the non-trivial sorry. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict WIP help-wanted	249/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	7-37521 7 days ago	7-37522 7 days ago	0-0 0 seconds
26348	mans0954 author:mans0954	WIP: feature(Analysis/LocallyConvex/Prime): The prime map	This PR continues the work from #24385. Original PR: https://github.com/leanprover-community/mathlib4/pull/24385	t-analysis merge-conflict WIP	125/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Prime.lean	2	3	['github-actions', 'mans0954', 'mathlib4-merge-conflict-bot']	nobody	7-37519 7 days ago	7-37520 7 days ago	5-43062 5 days
27443	yuanyi-350 author:yuanyi-350	doc: Stacks tags	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis merge-conflict awaiting-author label:t-algebra$	6/3	Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/RingTheory/Adjoin/Tower.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Noetherian/Basic.lean	4	10	['YaelDillies', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-merge-conflict-bot', 'yuanyi-350']	nobody	7-37271 7 days ago	7-37272 7 days ago	0-82442 22 hours
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	7-36286 7 days ago	7-36287 7 days ago	0-1 1 second
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	large-import t-analysis merge-conflict awaiting-author	334/93	Mathlib.lean,Mathlib/Analysis/LocallyConvex/AbsConvex.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	9	n/a	['JonBannon', 'eric-wieser', 'faenuccio', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mans0954', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll']	nobody	7-34926 7 days ago	unknown	unknown
29369	vlad902 author:vlad902	feat(SimpleGraph): `IsSubwalk` of common Walk decompositions	Add some helper lemmas to show that decompositions of walks are sub-walks.	t-combinatorics merge-conflict	61/17	Mathlib/Combinatorics/SimpleGraph/Connectivity/WalkDecomp.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	awainverse assignee:awainverse	7-4440 7 days ago	7-4441 7 days ago	62-42811 62 days
30908	vihdzp author:vihdzp	refactor: swap `Function.update_apply` and `Pi.single_apply`	These are backwards compared to `Finsupp.single_apply`, `DFinsupp.single_apply`, `Polynomial.coeff_monomial`, etc. --- - [ ] depends on: #30909 - [ ] depends on: #30911 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	34/81	Mathlib/Algebra/Group/Pi/Lemmas.lean,Mathlib/Algebra/Notation/Pi/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Function/Basic.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	6-69831 6 days ago	6-69832 6 days ago	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 infinity-cosmos t-category-theory merge-conflict awaiting-author	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	4-52096 4 days ago	83-37562 2 months ago	17-16247 17 days
10235	urkud author:urkud	feat: add `Decidable`, `Fintype`, `Encodable` linters	This PR ports the `decidableClassical`, `fintypeFinite` and `encodableCountable` linters from mathlib3: all three are environment linters which flag declarations that have a hypothesis `[Decidable p]` etc., but do not use the underlying assumption in this type. Restructuring the code can make the statement more general. The implementation is in fact quite general, and can easily adapt to include further types. PRs #17518 and #17519 are two examples of further such linters. --- Please don't fix the failures related to `HasFDerivWithinAt.pi`. Finiteness assumptions in these lemmas will be completely removed during porting to TVS. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench large-import t-linter t-meta merge-conflict awaiting-author	123/4	Mathlib.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GeneralizeProofs.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	11	n/a	['Command-Master', 'Vierkantor', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'mathlib4-merge-conflict-bot', 'urkud']	nobody	4-36600 4 days ago	unknown	unknown
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/)	t-meta merge-conflict awaiting-author	1/1	Mathlib/Tactic/GeneralizeProofs.lean	1	5	['github-actions', 'jcommelin', 'kmill', 'mathlib4-merge-conflict-bot']	nobody	4-36355 4 days ago	4-36356 4 days ago	10-36842 10 days
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	3672/31	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	4-13487 4 days ago	13-72955 13 days ago	0-0 0 seconds
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-algebra t-number-theory merge-conflict awaiting-author label:t-algebra$	222/34	Mathlib.lean,Mathlib/Algebra/Ring/Int/Field.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/ExistsRamified.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean	12	22	['erdOne', 'github-actions', 'jcommelin', 'mathlib4-merge-conflict-bot', 'tb65536', 'xroblot']	jcommelin assignee:jcommelin	4-514 4 days ago	4-794 4 days ago	21-14802 21 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 merge-conflict delegated label:t-algebra$	33/6	Mathlib/RingTheory/TensorProduct/Basic.lean	1	8	['adomani', 'github-actions', 'kbuzzard', 'leanprover-bot', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	adomani assignee:adomani	3-67664 3 days ago	3-67665 3 days ago	56-85445 56 days
29937	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): `ringKrullDim` of quotient via supportDim	In this PR, we establish some lemma about `ringKrullDim` of quotient via lemmas of `supportDim`. Co-authored-by: Yongle Hu @mbkybky --- - [ ] depends on: #26219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict	290/15	Mathlib.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Support.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-53646 3 days ago	3-53647 3 days ago	0-8336 2 hours
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	t-algebra t-topology merge-conflict WIP 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	3-39537 3 days ago	133-52580 4 months ago	1-33784 1 day
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 - [ ] 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 - [ ] 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	large-import t-topology t-category-theory merge-conflict WIP	42352/491	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolutions.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/BifunctorFlip.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/ComplexShape.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/ConnectShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/DerivedCategory/FullyFaithful.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.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/RestrictionHomology.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/ExactSequence.lean,Mathlib/Algebra/Homology/ExactSequenceFour.lean,Mathlib/Algebra/Homology/Factorizations/Basic.lean,Mathlib/Algebra/Homology/Factorizations/CM5a.lean,Mathlib/Algebra/Homology/Factorizations/CM5b.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/Cylinder.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/HomotopyCategory/SpectralObject.lean,Mathlib/Algebra/Homology/HomotopyFiber.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/CochainComplexMinus.lean,Mathlib/Algebra/Homology/LeftResolutions/Reduced.lean,Mathlib/Algebra/Homology/LeftResolutions/Transport.lean,Mathlib/Algebra/Homology/Localization.lean,Mathlib/Algebra/Homology/Monoidal.lean,Mathlib/Algebra/Homology/ObjectProperty.lean,Mathlib/Algebra/Homology/PreservesQuasiIso.lean,Mathlib/Algebra/Homology/QuasiIso.lean,Mathlib/Algebra/Homology/Refinements.lean,Mathlib/Algebra/Homology/ShortComplex/Abelian.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	296	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-76274 2 days ago	unknown	unknown
31505	dsfxcimk author:dsfxcimk	Yulia	Add several theorems relating oriented angles and affine independence / collinearity, together with auxiliary lemmas about the equality and sign of oriented angles. Main additions `oangle_ne_zero_and_ne_pi_iff_not_collinear` – An oriented angle is neither `0` nor `π` if and only if the three points are not collinear. `affineIndependent_iff_of_oangle_eq` – If two oriented angles are equal, then the corresponding triples of points are affinely independent simultaneously. `not_collinear_iff_of_angle_eq` – If two oriented angles are equal, one triple is collinear if and only if the other is. `oangle_eq_or_eq_neg_of_angle_eq` – The oriented angles are equal or opposite if the unoriented angles are equal. `angle_eq_neg_of_two_zsmul_angle_eq` – If `2 • a = 2 • b` and the signs are opposite, then `a = b + π.` `two_zsmul_eq_iff_eq` – Characterizes equality of doubled angles when signs are equal. `oangle_sub_oangle_ne_pi_of_not_collinear` – If the signs of two oriented angles are equal and the points are not collinear, their difference is not `π`.	new-contributor t-euclidean-geometry merge-conflict awaiting-author	83/0	Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean	1	9	['jsm28']	nobody	2-65566 2 days ago	2-65629 2 days ago	0-50 50 seconds
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/)	t-category-theory merge-conflict awaiting-author	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	2-48214 2 days ago	2-48215 2 days ago	4-48785 4 days
30373	sinhp author:sinhp	feat (CategoryTheory) : LCCC sections (constructing right adjoint to `Over.ChosenPullback.pullback`)	In LCCCs development, the `sections` functor is used to define the right adjoint to the pullback functor `Over.ChosenPullback.pullback`. This PR defines `Over.sections` and proves that it is a right adjoint to the `toOver (I : C) : C ⥤ Over I` (this is the computable analogue of `star`). This is the computable enhancement of #22319: instead of `Limits.pullback` this PR builds on top of `Over.ChosenPullback` and thus we eliminate any instance of noncomputable constructs. --- - [ ] depends on: #31033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	636/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullback.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Sections.lean	4	5	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	robin-carlier assignee:robin-carlier	2-48212 2 days ago	2-48213 2 days ago	0-26856 7 hours
31332	sinhp author:sinhp	feat(CategoryTheory): Exponentiable morphisms	We define an exponentiable morphism `f : I ⟶ J` to be a morphism with a chosen pullback functor `Over J ⥤ Over I` together with a right adjoint, called the pushforward functor. We use this PR in the PR branch `lccc-basic`. --- - [ ] depends on: #31033 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	536/0	Mathlib.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullback.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ExponentiableMorphism.lean	3	5	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	2-47838 2 days ago	2-47839 2 days ago	0-14 14 seconds
30441	linesthatinterlace author:linesthatinterlace	fix(Data/List/Sort): Deprecate and replace `List.Sorted`	Deprecates `Sorted` and defines new special-case predicates to be used for preorders. --- `List.Sorted` is essentially an irrelevant definition, as it is identical to List.Pairwise, and we have some results about Sorted which also always apply to Pairwise or do so under certain conditions (and vice versa). We also commonly use Sorted to talk specifically about `<` and `<=`, which can be somewhat unwieldy. This PR deprecates `Sorted` (so that there should now be no non-deprecated definitions under that namespace), and adds in `SortedLE`, `SortedLT`, `SortedGE` and `SortedGT`, which are defined analogously to `List.Nodup` for Preorders (List.Nodup is a good example of somewhere where using a special case of Pairwise works well). The vision is that API for these can be created together and for many purposes will suffice. `insertionSort` has now been moved to be independent of any of this, though theorems are provided showing that it does link to these predicates in a linear order. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	781/521	Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/Analysis/Convex/BetweenList.lean,Mathlib/Combinatorics/Young/YoungDiagram.lean,Mathlib/Data/Fin/Tuple/Sort.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/List/Pairwise.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Multiset/Sort.lean,Mathlib/Data/Nat/BitIndices.lean,Mathlib/Data/Nat/Factors.lean,Mathlib/LinearAlgebra/Matrix/Spectrum.lean,Mathlib/Logic/Equiv/Finset.lean,Mathlib/Logic/Equiv/Multiset.lean,Mathlib/NumberTheory/ADEInequality.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/Synonym.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/Tactic/Simproc/Factors.lean,Mathlib/Topology/Category/Profinite/Nobeling/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling/Span.lean	25	56	['github-actions', 'joelriou', 'linesthatinterlace', 'mathlib4-merge-conflict-bot', 'vihdzp']	nobody	2-30228 2 days ago	2-30229 2 days ago	26-41807 26 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	t-algebra t-analysis t-number-theory merge-conflict 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	1-61469 1 day ago	1-61469 1 day ago	127-58875 127 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/)	t-topology merge-conflict	804/301	Mathlib/Topology/Algebra/IsUniformGroup/Basic.lean,Mathlib/Topology/Algebra/IsUniformGroup/Defs.lean	2	6	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-55440 1 day ago	1-55441 1 day ago	0-0 0 seconds
30281	j-loreaux author:j-loreaux	chore(Analysis/{NormedSpace,Normed/Module}): migrate all remaining files	closes #28698 --- - [ ] depends on: #29447 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-analysis merge-conflict	36/36	Mathlib.lean,Mathlib/Analysis/CStarAlgebra/Unitary/Span.lean,Mathlib/Analysis/Calculus/DifferentialForm/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/CompCLM.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/ConvergenceOnBall.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Convex/AmpleSet.lean,Mathlib/Analysis/Normed/Module/Alternating/Basic.lean,Mathlib/Analysis/Normed/Module/Alternating/Curry.lean,Mathlib/Analysis/Normed/Module/Alternating/Uncurry/Fin.lean,Mathlib/Analysis/Normed/Module/Connected.lean,Mathlib/Analysis/Normed/Module/ENormedSpace.lean,Mathlib/Analysis/Normed/Module/Extr.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/Normed/Module/MStructure.lean,Mathlib/Analysis/Normed/Module/Multilinear/Basic.lean,Mathlib/Analysis/Normed/Module/Multilinear/Curry.lean,Mathlib/Analysis/Normed/Module/MultipliableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/Normalize.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Analysis/Normed/Module/RieszLemma.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/Normed/Operator/CompleteCodomain.lean,Mathlib/Analysis/SpecialFunctions/Integrability/LogMeromorphic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Geometry/Euclidean/SignedDist.lean,Mathlib/NumberTheory/LSeries/ZMod.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean	30	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-55316 1 day ago	1-55317 1 day ago	3-41416 3 days
30122	xroblot author:xroblot	Development branch (1)	---	large-import merge-conflict WIP	3370/86	Mathlib.GaloisTower.lean,Mathlib.lean,Mathlib/Cyclotomic.lean,Mathlib/Data/Nat/Digits/DigitsFin.lean,Mathlib/DigitsFn.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/KroneckerWeber_Blueprint.lean,Mathlib/Misc.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Basic.lean,Mathlib/NumberTheory/NumberField/Cyclotomic/Ideal.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/NumberTheory/NumberField/Ideal/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/Riccardo.lean,Mathlib/RingTheory/DedekindDomain/Factorization.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/Int.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/Stickelberger.lean	24	6	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-48953 1 day ago	8-74685 8 days ago	0-12 12 seconds
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.	t-data merge-conflict	35/0	Mathlib/Data/List/Scan.lean	1	11	['ShreckYe', 'github-actions', 'mathlib4-merge-conflict-bot', 'themathqueen', 'vlad902']	pechersky assignee:pechersky	1-17700 1 day ago	4-15431 4 days ago	74-62841 74 days
27936	alreadydone author:alreadydone	feat(Algebra): additivize Dvd and Prime	`Prime` can't be directly additivized, so we introduce `Preprime`, which drops the `≠ 0` condition, and additivize it to `AddPrime`. To show that `Preprime` 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 preprime iff one component is a unit and the other is preprime, and the same with `Preprime` 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 merge-conflict label:t-algebra$	400/191	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/ToAdditive/GuessName.lean	30	13	['JovanGerb', 'adomani', 'alreadydone', 'bryangingechen', 'github-actions', 'mathlib4-merge-conflict-bot']	bryangingechen assignee:bryangingechen	1-15423 1 day ago	1-15424 1 day ago	98-49698 98 days
28546	Sfgangloff author:Sfgangloff	feat(SymbolicDynamics): basic setup of Zd, full shift, cylinders, pat…	# Symbolic dynamics on groups: core API and entropy along finite shapes 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).	new-contributor t-dynamics merge-conflict	752/0	Mathlib.lean,Mathlib/Dynamics/SymbolicDynamics/Basic.lean,Mathlib/Tactic/ToAdditive/GuessName.lean	3	120	['Sfgangloff', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-merge-conflict-bot', 'sgouezel']	sgouezel assignee:sgouezel	1-15422 1 day ago	1-15423 1 day ago	70-47424 70 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/)	large-import awaiting-zulip new-contributor t-category-theory t-meta merge-conflict	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	1-13749 1 day ago	1-13749 1 day ago	1-18384 1 day
27706	xroblot author:xroblot	feat(RingTheory/Localization/AtPrime): inertia degree and ramification index are preserved by localization	Let `R ⊆ S` be an extension of rings and `p` be a prime ideal of `R`. Denote by `Rₚ` the localization of `R` at the complement of `p` and by `Sₚ` the localization of `S` at the (image) of the complement of `p`. In this PR, we prove that the bijection between the (nonzero) prime ideals of `Sₚ` and the prime ideals of `S` above `p` preserves the residual degree and the ramification index. --- - [x] depends on: #27794 - [x] depends on: #27796 - [x] depends on: #27798 - [x] depends on: #28526 - [x] depends on: #29322	t-ring-theory merge-conflict	508/122	Mathlib.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Localization/AtPrime/Extension.lean,Mathlib/RingTheory/Trace/Quotient.lean	8	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-77193 21 hours ago	1-61715 1 day ago	0-1400 23 minutes
26484	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): basics of diffeological spaces	Introduces diffeological spaces, smooth maps between them, the D-topology and the standard diffeology on finite-dimensional normed spaces. --- This PR continues the work from #21969.	t-differential-geometry merge-conflict	471/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib	3	11	['JovanGerb', 'github-actions', 'grunweg', 'lecopivo', 'mathlib4-merge-conflict-bot', 'peabrainiac']	grunweg assignee:grunweg	0-74003 20 hours ago	0-74004 20 hours ago	138-31722 138 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 will split it into multiple small PRs if it is decided that we will merge it. --- 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 * Implement eventual zeroness oracle. * Support different domains in `compute_limit` as well. * Support 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. - [x] depends on: #31047 - [x] depends on: #28874 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-meta merge-conflict WIP	17665/340	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/SpecialFunctions/Complex/Analytic.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Set/Pointwise/Interval.lean,Mathlib/Tactic.lean,Mathlib/Tactic/ComputeAsymptotics.lean,Mathlib/Tactic/ComputeAsymptotics/Lemmas.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/Defs.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/Exp.lean,Mathlib/Tactic/ComputeAsymptotics/Meta/LeadingTerm.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/Multiseries.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basic.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Basis.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Defs.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/LeadingTerm.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/LogBasis.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/ForPow.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Inv.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Log.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Operations/Merge.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/Term.lean,Mathlib/Tactic/ComputeAsymptotics/Multiseries/Trimming.lean,Mathlib/Tactic/NormNum/NatFactorial.lean,Mathlib/Topology/Algebra/Order/Field.lean,MathlibTest/compute_asymptotics.lean,scripts/README.md,scripts/migrate_to_fork.py,scripts/noshake.json	53	2	['grunweg', 'mathlib4-dependent-issues-bot']	nobody	0-63458 17 hours ago	7-38202 7 days ago	0-54 54 seconds
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	7	['github-actions', 'grunweg', 'kbuzzard', 'mathlib4-merge-conflict-bot']	kbuzzard assignee:kbuzzard	0-57255 15 hours ago	0-57256 15 hours ago	98-27129 98 days
31386	harahu author:harahu	doc: demote repeated H1 headers to H2	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	343/127	Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Action/Prod.lean,Mathlib/Algebra/Group/AddChar.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Equiv/Defs.lean,Mathlib/Algebra/Group/Submonoid/Units.lean,Mathlib/Algebra/Group/Units/Basic.lean,Mathlib/Algebra/Group/Units/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Degree.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/Algebra/Polynomial/PartialFractions.lean,Mathlib/Algebra/Ring/Subring/IntPolynomial.lean,Mathlib/AlgebraicTopology/SingularSet.lean,Mathlib/Combinatorics/Derangements/Finite.lean,Mathlib/Combinatorics/Enumerative/Stirling.lean,Mathlib/Combinatorics/Matroid/Circuit.lean,Mathlib/Combinatorics/Matroid/Minor/Contract.lean,Mathlib/Combinatorics/Matroid/Minor/Delete.lean,Mathlib/Combinatorics/Matroid/Minor/Order.lean,Mathlib/Combinatorics/Matroid/Rank/Cardinal.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Combinatorics/Matroid/Rank/Finite.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/Nat/Factorial/Basic.lean,Mathlib/Data/Nat/Fib/Basic.lean,Mathlib/Dynamics/Ergodic/Ergodic.lean,Mathlib/FieldTheory/Galois/GaloisClosure.lean,Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/Projectivization/Independence.lean,Mathlib/LinearAlgebra/Quotient/Pi.lean,Mathlib/Logic/Equiv/Fintype.lean,Mathlib/MeasureTheory/Function/UnifTight.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/CircleAverage.lean,Mathlib/MeasureTheory/Measure/HasOuterApproxClosedProd.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/NumberTheory/Fermat.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Basic.lean,Mathlib/NumberTheory/NumberField/DedekindZeta.lean,Mathlib/Order/Filter/CardinalInter.lean,Mathlib/Probability/Distributions/Uniform.lean,Mathlib/RepresentationTheory/Rep.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/Derivation/Lie.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/LocalRing/LocalSubring.lean,Mathlib/RingTheory/Morita/Basic.lean,Mathlib/RingTheory/Noetherian/UniqueFactorizationDomain.lean,Mathlib/RingTheory/NormalClosure.lean,Mathlib/RingTheory/Polynomial/Eisenstein/Criterion.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Valuation/AlgebraInstances.lean,Mathlib/RingTheory/Valuation/Minpoly.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/Tactic/Linarith/Oracle/SimplexAlgorithm/PositiveVector.lean,Mathlib/Tactic/Linter/Lint.lean,Mathlib/Tactic/Linter/MinImports.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/TFAE.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Topology/Algebra/Category/ProfiniteGrp/Basic.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Algebra/Group/ClosedSubgroup.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Algebra/Valued/ValuativeRel.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Order/NhdsSet.lean,Mathlib/Topology/UniformSpace/Equiv.lean,scripts/demote_docstring_headers.py,scripts/find_docstring_headers.py	90	3	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	0-56007 15 hours ago	0-56008 15 hours ago	0-0 0 seconds
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	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	0-55882 15 hours ago	0-69294 19 hours ago *	0-69268 19 hours *
31345	dagurtomas author:dagurtomas	feat(CategoryTheory): some API for transporting monoidal morphism properties	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict delegated	43/8	Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean	3	8	['dagurtomas', 'github-actions', 'joelriou', 'mathlib-bors', 'mathlib4-merge-conflict-bot']	nobody	0-51807 14 hours ago	0-51808 14 hours ago	5-21014 5 days
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/)	t-meta merge-conflict	320/17	Mathlib/Tactic/GCongr/Core.lean,MathlibTest/GConvert.lean	2	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	0-42894 11 hours ago	0-42895 11 hours ago	0-0 0 seconds
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/)	awaiting-zulip t-computability new-contributor merge-conflict awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	15	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions', 'leanprover-community-bot-assistant', 'meithecatte']	nobody	0-23482 6 hours ago	178-53440 5 months ago	45-84611 45 days
24614	JovanGerb author:JovanGerb	chore: rename field `inf` to `min` in `Lattice`	As suggested by @eric-wieser, this PR renames the `sup` and `inf` fields in `Lattice` to `max` and `min`. This means that we now can extend `Lattice` and `LinearOrder` simultaneously without ending up with duplicate fields. This should be implemented in a future PR for existing classes like `CompleteLinearOrder`. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60sup.60.2F.60inf.60.20or.20.60max.60.2F.60min.60.20for.20set.20interval.20lemmas.3F) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-order merge-conflict	181/187	Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Ring/Idempotent.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Tropical/Lattice.lean,Mathlib/AlgebraicGeometry/IdealSheaf/Basic.lean,Mathlib/Analysis/BoxIntegral/Box/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Basic.lean,Mathlib/Analysis/Convex/SimplicialComplex/Basic.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/Seminorm.lean,Mathlib/CategoryTheory/Groupoid/Subgroupoid.lean,Mathlib/CategoryTheory/Sites/Coverage.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Subpresheaf/Basic.lean,Mathlib/Combinatorics/Digraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Computability/Reduce.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Semiquot.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Data/Sum/Lattice.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/ModelTheory/Substructures.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/Order/Booleanisation.lean,Mathlib/Order/CompleteLattice/Defs.lean,Mathlib/Order/Concept.lean,Mathlib/Order/ConditionallyCompleteLattice/Defs.lean,Mathlib/Order/Copy.lean,Mathlib/Order/Filter/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/GaloisConnection/Basic.lean,Mathlib/Order/Heyting/Basic.lean,Mathlib/Order/Hom/Order.lean,Mathlib/Order/Ideal.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Partition/Finpartition.lean,Mathlib/Order/Preorder/Finsupp.lean,Mathlib/Order/PropInstances.lean,Mathlib/Order/Sublattice.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Process/Filtration.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Small.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Lattice.lean,Mathlib/RingTheory/UniqueFactorizationDomain/FactorSet.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/Group/GroupTopology.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/LocallyFinsupp.lean,Mathlib/Topology/MetricSpace/BundledFun.lean,Mathlib/Topology/UniformSpace/Basic.lean	84	15	['JovanGerb', 'bryangingechen', 'eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	0-13531 3 hours ago	2-31932 2 days ago	24-8021 24 days
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/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	49/48	Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Module.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	492-62815 1 year ago	492-62838 1 year ago	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/)	t-category-theory merge-conflict blocked-by-other-PR WIP	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	470-82141 1 year ago	483-6979 1 year ago	0-0 0 seconds
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/)	tech debt t-linter merge-conflict 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	3	['github-actions', 'grunweg', 'leanprover-community-mathlib4-bot']	nobody	470-82138 1 year ago	492-62838 1 year ago	0-15202 4 hours
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/)	t-algebra t-number-theory merge-conflict 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	470-82138 1 year ago	521-37126 1 year ago	0-34665 9 hours
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 blocked-by-other-PR WIP	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	470-82136 1 year ago	534-85357 1 year ago	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/)	t-topology merge-conflict blocked-by-other-PR	162/0	Mathlib.lean,Mathlib/Topology/Algebra/Order/IccExtendFromIoo.lean	2	1	['leanprover-community-mathlib4-bot']	nobody	470-82134 1 year ago	492-62838 1 year ago	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/)	t-meta merge-conflict blocked-by-core-PR blocked-by-other-PR WIP	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	470-82134 1 year ago	532-59775 1 year ago	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/)	t-meta merge-conflict blocked-by-other-PR	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	470-82134 1 year ago	492-62838 1 year ago	6-59794 6 days
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/)	t-meta merge-conflict blocked-by-other-PR	491/1	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Lean/Meta/ExprWithLevels.lean	4	1	['kim-em']	nobody	470-82133 1 year ago	534-85357 1 year ago	0-0 0 seconds
13852	FR-vdash-bot author:FR-vdash-bot	perf: skip some typeclasses in TC search	--- - [ ] depends on: #7873 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis merge-conflict blocked-by-other-PR	45/33	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Norm.lean	3	21	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	466-52122 1 year ago	466-52123 1 year ago	0-0 0 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/)	t-order t-topology merge-conflict blocked-by-other-PR	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	456-75787 1 year ago	456-75787 1 year ago	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/)	t-meta merge-conflict blocked-by-other-PR	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	455-71992 1 year ago	455-71992 1 year ago	0-0 0 seconds
9154	FR-vdash-bot author:FR-vdash-bot	feat: `npow` / `nsmul` / `Nat.cast`/ `zpow` / `zsmul` implemented using `Nat.binaryRec`	--- - [ ] depends on: https://github.com/leanprover/lean4/pull/3756 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author 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	['FR-vdash-bot', 'eric-wieser', 'kim-em', 'leanprover-community-mathlib4-bot']	nobody	455-71465 1 year ago	455-71465 1 year ago	0-0 0 seconds
7026	mo271 author:mo271	feat: toMonoidHom_coe	- [ ] depends on: #6791 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict blocked-by-other-PR	16/0	Mathlib/NumberTheory/LegendreSymbol/MulCharacter.lean	1	3	['leanprover-community-mathlib4-bot', 'mo271']	nobody	455-71428 1 year ago	455-71428 1 year ago	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/)	t-euclidean-geometry merge-conflict blocked-by-other-PR	98/0	Mathlib.lean,Mathlib/Geometry/Hyperbolic/UpperHalfPlane/Basic.lean,Mathlib/LinearAlgebra/Matrix/ProjectiveSpecialLinearGroup.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	430-81464 1 year ago	430-81464 1 year ago	0-0 0 seconds
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/)	t-topology merge-conflict please-adopt 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	424-7648 1 year ago	424-7648 1 year ago	1-72084 1 day
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-algebraic-geometry t-number-theory merge-conflict blocked-by-other-PR 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	n/a	['Multramate', 'alreadydone', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	418-25657 1 year ago	unknown	unknown
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/)	new-contributor t-algebra merge-conflict blocked-by-other-PR 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	415-45329 1 year ago	415-45329 1 year ago	0-0 0 seconds
16215	adomasbaliuka author:adomasbaliuka	feat(Tactic/Linter): lint unwanted unicode	Add a text-based style linter that checks all unicode characters. - Only allow whitelisted characters, with a suggestion to add the flagged character to the whitelist - Some characters are specified to use emoji-variant or text-variant. The linter ensures these variant-selectors only appear in the correct places and provides an auto-fix to clean them up. --- Discussed at [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Whitelist.20for.20Unicode.3F/near/448721083) The current proposal checks each character against a whitelist. There is also the question of what the whitelist should contain. A reasonable whitelist might be "all unicode currently in Mathlib" ∪ [Wikipedia/Mathematical_operators_and_symbols_in_Unicode](https://en.wikipedia.org/wiki/Mathematical_operators_and_symbols_in_Unicode) ∪ [EdAyers/mathlib3/docs/unicode.md](https://github.com/EdAyers/mathlib/blob/fb5c2ffe917049959597b0a93b872e91f4004922/docs/unicode.md). Currently implemented is a subset of this list closer to what's currently present in mathlib. - [x] depends on: #17068 - [x] depends on: #17116 - [ ] depends on: #17129 (part 1 of this PR) - [ ] depends on: #17131 (part 2 of this PR) - Future note: @adomasbaliuka says: "we might add something to the Mathlib 4 docs about this as well?" [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	462/15	Mathlib/GroupTheory/GroupExtension/Defs.lean,Mathlib/Tactic/Linter/TextBased.lean,Mathlib/Tactic/Linter/UnicodeLinter.lean,Mathlib/Tactic/Widget/Calc.lean,Mathlib/Tactic/Widget/CongrM.lean,Mathlib/Tactic/Widget/Conv.lean,Mathlib/Tactic/Widget/GCongr.lean,Mathlib/Topology/ContinuousFunction/Weierstrass.lean,test/LintStyle.lean	9	51	['adomasbaliuka', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'mathlib4-dependent-issues-bot']	nobody	410-13338 1 year ago	410-13338 1 year ago	12-19694 12 days
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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	415/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41307 1 year ago	407-41307 1 year ago	0-1045 17 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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	300/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41307 1 year ago	407-41308 1 year ago	0-1299 21 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/)	new-contributor t-logic merge-conflict blocked-by-other-PR	525/7	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Syntax.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	407-41306 1 year ago	407-41306 1 year ago	0-613 10 minutes
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	t-data merge-conflict blocked-by-other-PR	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	394-13048 1 year ago	394-13048 1 year ago	0-0 0 seconds
17519	grunweg author:grunweg	feat: the `metrisableSpace` linter	Similar to #10235, lint on occurrences of `MetricSpace` which should be `MetrisableSpace`. --- - [ ] depends on: #10235 (for all the details) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	155/21	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/MLList/Split.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Measure/Doubling.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/RefinedDiscrTree.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean,Mathlib/Util/Superscript.lean,scripts/noshake.json	19	4	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	393-35962 1 year ago	402-36436 1 year ago *	402-36396 402 days *
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/)	t-data new-contributor merge-conflict awaiting-author blocked-by-other-PR	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	389-63964 1 year ago	389-63964 1 year ago	6-8380 6 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/)	t-computability merge-conflict blocked-by-other-PR	448/4	Mathlib/Computability/ContextFreeGrammar.lean	1	50	['Rida-Hamadani', 'YaelDillies', 'github-actions', 'leanprover-community-mathlib4-bot', 'madvorak']	nobody	376-75292 1 year ago	376-75292 1 year ago	72-28392 72 days
17518	grunweg author:grunweg	feat: lint on declarations mentioning `Invertible` or `Unique`	Using the same infrastructure as for #10235. Depends on that PR to land first, and also (for the first lint) a zulip discussion if that change is desired/about the best way to enact it. --- - [ ] depends on: #10235	awaiting-zulip t-linter merge-conflict blocked-by-other-PR	149/7	Mathlib.lean,Mathlib/Algebra/MvPolynomial/PDeriv.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Encodable/Basic.lean,Mathlib/NumberTheory/JacobiSum/Basic.lean,Mathlib/Order/Heyting/Regular.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedAssumptionInType.lean	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	376-48025 1 year ago	402-36547 1 year ago *	0-0 0 seconds *
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/)	t-algebra awaiting-CI merge-conflict blocked-by-other-PR WIP 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	370-47992 1 year ago	370-47992 1 year ago	0-0 0 seconds
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/)	t-algebraic-geometry merge-conflict 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	369-73413 1 year ago	369-73413 1 year ago	0-1869 31 minutes
17593	FR-vdash-bot author:FR-vdash-bot	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/)	t-order t-algebra merge-conflict blocked-by-other-PR 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	n/a	['FR-vdash-bot', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	358-67556 11 months ago	unknown	unknown
17624	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): generalize lemmas	--- - [ ] depends on: #17623 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	121/26	Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	355-18328 11 months ago	355-18328 11 months ago	0-465 7 minutes
17515	FR-vdash-bot author:FR-vdash-bot	perf: do not need `simp low` now	--- - [ ] depends on: #17513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict 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	353-63749 11 months ago	353-63749 11 months ago	0-380 6 minutes
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/)	t-logic blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	341-65788 11 months ago	367-55758 1 year ago	0-37 37 seconds
19281	Vierkantor author:Vierkantor	chore(Algebra/{MonoidAlgebra,Polynomial}): algebra structure in `Basic.lean`	[As discussed in PR 19205](https://github.com/leanprover-community/mathlib4/pull/19205#discussion_r1848539148) the Algebra structure on `Polynomial` and `MonoidAlgebra` is very fundamental and shouldn't be hidden away. So let's refactor the import hierarchy to make them available in `Basic.lean`. In addition to #19097, this moves the algebra structure on polynomials into `Algebra/Polynomial/Basic.lean` (which will import the other important instances on polynomials), and moves the algebra structure on `MonoidAlgebra`s into `Algebra/MonoidAlgebra/Basic.lean` (moving most of the existing results in that file into `Lemmas.lean`). --- - [ ] depends on: #19097 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	3506/2792	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/FreeNonUnitalNonAssocAlgebra.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Lemmas.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MonoidAlgebra/Opposite.lean,Mathlib/Algebra/MonoidAlgebra/Support.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Cardinal.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Degree/TrailingDegree.lean,Mathlib/Algebra/Polynomial/EraseUpdate.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/Eval/Degree.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Module.lean,Mathlib/Algebra/Polynomial/Monomial.lean,Mathlib/Algebra/Polynomial/Sum.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/Data/Finsupp/Ext.lean,Mathlib/Data/Finsupp/Fintype.lean,Mathlib/Data/Finsupp/Indicator.lean,Mathlib/Data/Finsupp/Notation.lean,Mathlib/Data/Finsupp/Pointwise.lean,Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/List/ToFinsupp.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/RepresentationTheory/Maschke.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Opposites.lean,Mathlib/RingTheory/Polynomial/Wronskian.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic/ExtractGoal.lean,MathlibTest/Polynomial.lean,MathlibTest/instance_diamonds.lean,scripts/noshake.json	52	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	338-65918 11 months ago	348-43048 11 months ago	0-0 0 seconds
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/)	large-import t-algebra merge-conflict blocked-by-other-PR 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	328-62616 10 months ago	328-62616 10 months ago	0-666 11 minutes
18262	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Presheaf): exterior powers of presheaves of modules	--- - [x] depends on: #18261 - [ ] depends on: #18236 - [ ] depends on: #18197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory merge-conflict blocked-by-other-PR WIP 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	328-53911 10 months ago	364-33976 11 months ago	0-0 0 seconds
11156	smorel394 author:smorel394	feat(LinearAlgebra/{TensorProductBasis,Dual}): basis and dual of `PiTensorProduct`	Construct a basis of a `PiTensorProduct` of modules given bases of the modules, and relationship between the dual of a `PiTensorProduct` and the `PiTensorProduct` of the duals. Main results: * `Basis.piTensorProduct` (in `LinearAlgebra/TensorProductBasis.lean`): Let `ι` be a `Fintype` and `M` be a family of modules indexed by `ι`. If `b i : κ i → M i` is a basis for every `i` in `ι`, then `fun (p : Π i, κ i) ↦ ⨂ₜ[R] i, b i (p i)` is a basis of `⨂[R] i, M i`. * `PiTensorProduct.dualDistrib` (in `LinearAlgebra/Dual.lean`): The canonical linear map from `⨂[R] i, Dual R (M i)` to `Dual R (⨂[R] i, M i)`, sending `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the linear equivalence `⨂[R] i, R →ₗ R` given by multiplication. * `PiTensorProduct.dualDistribEquiv` (also in `LinearAlgebra/Dual.lean`): A linear equivalence between `⨂[R] i, Dual R (M i)` and `Dual R (⨂[R] i, M i)` when all `M i` are finite free modules. If `f : (i : ι) → Dual R (M i)`, then this equivalence sends `⨂ₜ[R] i, f i` to the composition of `PiTensorProduct.map f` with the natural isomorphism `⨂[R] i, R ≃ R` given by multiplication. - [ ] depends on: #11155 (currently used as the base branch; do not merge without switching it back to `master`!) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	166/2	Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/Dual.lean,Mathlib/LinearAlgebra/TensorProduct/Basis.lean	3	4	['eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	318-62041 10 months ago	363-77669 11 months ago	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-order t-algebra merge-conflict awaiting-author blocked-by-other-PR 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	315-34845 10 months ago	315-34845 10 months ago	0-3440 57 minutes
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/)	large-import t-algebraic-geometry t-category-theory merge-conflict blocked-by-other-PR WIP	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	306-49262 10 months ago	unknown	unknown
19462	joelriou author:joelriou	feat(AlgebraicGeometry): étale sheafification	After #19096 and #18945 are merged, if `S : Scheme.{u}`, we shall get instances like `HasSheafify (smallEtaleTopology S) (Type (u + 1))` which means that in order to sheafify preshaves over the small étale site of `S`, we need to assume a certain bump in the universe in the target category. With the main result in this PR (there are still a few sorries), we shall get `HasSheafify (smallEtaleTopology S) (Type u)`. Then, in the subsequent development of étale formalism, we can work in `Type u` (or `Ab.{u}`, etc). --- This is a draft. - [ ] depends on: #19444 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict blocked-by-other-PR WIP	1336/2	Mathlib.lean,Mathlib/AlgebraicGeometry/Sites/EtaleSheafification.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite.lean,Mathlib/CategoryTheory/Sites/LocallyFullyFaithful.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean,Mathlib/CategoryTheory/Sites/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	304-61720 10 months ago	351-69857 11 months ago	0-200 3 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	new-contributor t-combinatorics merge-conflict blocked-by-other-PR	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', 'leanprover-community-mathlib4-bot']	YaelDillies assignee:YaelDillies	301-64308 9 months ago	301-64308 9 months ago	0-1791 29 minutes
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/)	workshop-AIM-AG-2024 t-algebraic-geometry merge-conflict blocked-by-other-PR	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	299-48810 9 months ago	455-72430 1 year ago	0-0 0 seconds
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/)	t-algebra t-topology merge-conflict 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	n/a	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	287-37209 9 months ago	unknown	unknown
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/)	t-logic blocked-by-other-PR	215/5	Mathlib/ModelTheory/PartialEquiv.lean,Mathlib/ModelTheory/Substructures.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	287-34256 9 months ago	287-34258 9 months ago	0-668 11 minutes
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/)	large-import new-contributor t-topology merge-conflict awaiting-author blocked-by-other-PR	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	277-26544 9 months ago	277-26544 9 months ago	39-21495 39 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/)	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	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	266-39332 8 months ago	295-52845 9 months ago	0-41 41 seconds
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/)	t-topology blocked-by-other-PR	488/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	263-14030 8 months ago	263-14032 8 months ago	0-412 6 minutes
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/)	t-topology blocked-by-other-PR	399/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	263-14028 8 months ago	263-14031 8 months ago	0-414 6 minutes
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	large-import merge-conflict blocked-by-other-PR	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	255-69862 8 months ago	255-69862 8 months ago	0-0 0 seconds
14060	YnirPaz author:YnirPaz	feat(SetTheory/Ordinal/Clubs): define club sets and prove basic properties	Create a file where club sets are defined and their basic properties are proven. I also created a new recursion principle for ordinals, bounded recursion. --- - [ ] depends on: #19189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic merge-conflict blocked-by-other-PR	315/3	Mathlib.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Club.lean,Mathlib/SetTheory/Ordinal/Topology.lean	6	93	['YaelDillies', 'YnirPaz', 'alreadydone', 'dupuisf', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp', 'zeramorphic']	nobody	255-11665 8 months ago	255-11665 8 months ago	92-44198 92 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-analysis t-combinatorics blocked-by-other-PR	0/0		0	4	['github-actions', 'leanprover-community-mathlib4-bot', 'mergify']	nobody	253-71652 8 months ago	253-71657 8 months 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/)	large-import t-category-theory merge-conflict blocked-by-other-PR WIP	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	253-58913 8 months ago	253-58913 8 months ago	0-17 17 seconds
21275	joneugster author:joneugster	feat(Cache): decompress downloaded files directly	Extract downloaded files directly. This increases parallelism as files are downloaded in parallel and downloading/decompressing use different hardware (network/cpu) --- - [ ] depends on: #21238 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR WIP	66/15	Cache/IO.lean,Cache/Lean.lean,Cache/Requests.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	251-73509 8 months ago	251-73509 8 months ago	0-0 0 seconds
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/)	infinity-cosmos t-category-theory merge-conflict blocked-by-other-PR	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	237-45968 7 months ago	237-45968 7 months ago	0-806 13 minutes
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/)	t-analysis merge-conflict blocked-by-other-PR	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	227-78413 7 months ago	227-78413 7 months ago	16-16341 16 days
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	218-63128 7 months ago	218-63129 7 months ago	0-336 5 minutes
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	218-63128 7 months ago	218-63130 7 months ago	0-2084 34 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/)	t-measure-probability please-adopt blocked-by-other-PR WIP	110/0	Counterexamples.lean,Counterexamples/LIntegralZero.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	214-38474 7 months ago	214-38476 7 months ago	0-22 22 seconds
24040	FR-vdash-bot author:FR-vdash-bot	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/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR 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	n/a	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	213-57088 6 months ago	unknown	unknown
24058	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*NormedField`	--- - [ ] depends on: #24040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	212-51879 6 months ago	213-27698 6 months ago *	0-0 0 seconds *
24106	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*CStarAlgebra`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #24058	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR 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	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	212-5020 6 months ago	212-7327 6 months ago *	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/)	t-topology blocked-by-other-PR	283/0	Mathlib.lean,Mathlib/Topology/UniformSpace/FineUniformity.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	211-24705 6 months ago	211-24707 6 months ago	2-85349 2 days
21238	joneugster author:joneugster	feat(Cache): enable partial cache in downstream projects	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` * accept paths `Mathlib/Init.lean` and modules `Mathlib.Init` likewise #21822 * accept folders in the form `Mathlib/Data` or `Mathlib.Data` and does a directory walk to find all`.lean` files therein #21838 * throw error if sources contain a build loop. #21632 * cleanup * internally cache now works with the module names as keys (used paths before) #21834 * eliminate need of parsing the `lake_manifest.json`, use the Lean search path from `LEAN_SRC_PATH` instead. #21666 * eliminate most hard-coded file paths, generating them from the module name with `Lean.findLean` #21818 * add documentation --- - [x] depends on: #21834 - [ ] depends on: #21838 ### Follow-up PR: - #21842 ### 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 - #21848 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	231/118	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	n/a	['github-actions', 'grunweg', 'joneugster', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	210-43533 6 months ago	unknown	unknown
21842	joneugster author:joneugster	refactor(Cache): use module name for file hash instead of non-resolved file path	This invalidates cache once, similarly to when the `lean-toolchain` gets bumped or the `lakefile` modified. --- - [ ] depends on: #21238 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI t-meta merge-conflict blocked-by-other-PR	284/139	Cache/Hashing.lean,Cache/IO.lean,Cache/Lean.lean,Cache/Main.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	210-43409 6 months ago	273-40432 9 months ago *	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/)	t-algebra merge-conflict 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	210-37630 6 months ago	210-37630 6 months ago	0-790 13 minutes
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/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	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	194-84898 6 months ago	194-84898 6 months ago	0-1 1 second
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/)	t-meta merge-conflict blocked-by-other-PR WIP	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	194-83714 6 months ago	194-83714 6 months ago	0-0 0 seconds
16186	joneugster author:joneugster	chore: use emoji-variant-selector `\uFE0F` for emojis ✅️,❌️,💥️,🟡️	Append the emoji-variant selector `\uFE0F` to these 4 unicode symbols which should always be rendered as emojis. --- This has been done in core, so it makes sense to do the same in Mathlib. - [x] depends on: leanprover/lean4#5173 - [ ] depends on: #16215 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict awaiting-author blocked-by-other-PR	28/28	.github/workflows/lean4checker.yml,.github/workflows/nightly_detect_failure.yml,.github/workflows/update_dependencies_zulip.yml,scripts/lean-pr-testing-comments.sh,test/AssertExists.lean	5	3	['github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	194-83398 6 months ago	194-83398 6 months ago	7-61243 7 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/)	awaiting-zulip t-computability new-contributor merge-conflict blocked-by-other-PR	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	192-30833 6 months ago	192-30838 6 months ago	0-179 2 minutes
24550	grunweg author:grunweg	feat: define `SliceModel` typeclass for models with corners for embedded submanifolds	Still work in progress: TODO write a proper module doc-string and commit message. --- - [ ] depends on: #23040 (at least morally) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	1214/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MSplits.lean,Mathlib/Geometry/Manifold/SliceModel.lean	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	189-28096 6 months ago	189-28528 6 months ago	0-0 0 seconds
18755	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `LinearIsometryClass`	--- - [ ] depends on: #18748 - [ ] depends on: #18754 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	243/116	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/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/Homeomorph.lean,Mathlib/Topology/MetricSpace/Isometry.lean,scripts/no_lints_prime_decls.txt	13	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	188-37542 6 months ago	363-80203 11 months ago	0-602 10 minutes
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/)	t-meta blocked-by-other-PR help-wanted	257/7	Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Matrix/Auto.lean,MathlibTest/matrix_auto.lean	3	7	['eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant']	nobody	173-32337 5 months ago	173-32358 5 months ago	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/)	large-import t-algebra merge-conflict blocked-by-other-PR 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	168-52140 5 months ago	168-52141 5 months ago	0-0 0 seconds
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	t-category-theory t-meta blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-81610 5 months ago	154-81779 5 months ago	0-0 0 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	t-meta blocked-by-other-PR	496/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Cancelable.lean,Mathlib/Tactic/CategoryTheory/RotateIsos/Lemmas.lean,scripts/noshake.json	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-81609 5 months ago	154-81610 5 months ago	0-0 0 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	t-category-theory t-meta awaiting-author blocked-by-other-PR WIP	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-81609 5 months ago	154-81862 5 months ago	0-0 0 seconds
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	t-category-theory t-meta blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-80628 5 months ago	154-81474 5 months ago	0-0 0 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	t-meta blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-80629 5 months ago	154-80630 5 months ago	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	t-analysis awaiting-author blocked-by-other-PR	45/0	Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean	1	3	['BoltonBailey', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	151-55721 4 months ago	151-56317 4 months ago	0-136 2 minutes
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/)	t-algebra merge-conflict blocked-by-other-PR WIP 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	147-77876 4 months ago	363-80202 11 months ago	0-0 0 seconds
25926	BoltonBailey author:BoltonBailey	feat: add lemma about `degreeOf_eq_degree`	Adds MvPolynomial.degreeOf_eq_degree, which states that the degree of a particular variable in a multivariate polynomial is equal to the degree of the single-variable polynomial obtained by treating the multivariable polynomial as a single variable polynomial over multivariable polynomials in the remaining variables. This PR continues the work from #12664. - [ ] depends on: #25920 depends on https://github.com/leanprover-community/mathlib4/pull/25920	t-algebra blocked-by-other-PR label:t-algebra$	50/0	Mathlib/Algebra/MvPolynomial/Equiv.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	146-51831 4 months ago	146-51832 4 months ago	5-1720 5 days
25925	BoltonBailey author:BoltonBailey	feat: file for lemmas about MvPolynomials over NoZeroDivisors	This PR continues the work from #11106 and #11073 Original PR: https://github.com/leanprover-community/mathlib4/pull/11106 - [x] depends on: #11095 - [x] depends on: #11094 - [ ] depends on: #25926 [We need this lemma to establish fact about degreeOf n (p + q)]	t-algebra blocked-by-other-PR label:t-algebra$	85/0	Mathlib/Algebra/MvPolynomial/NoZeroDivisors.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	145-30432 4 months ago	145-30433 4 months ago	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/)	t-algebra awaiting-author 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	32	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions', 'jcommelin', 'kbuzzard', 'kim-em', 'mathlib4-dependent-issues-bot', 'wmacmil']	nobody	143-13701 4 months ago	228-41341 7 months ago	43-16103 43 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/)	t-algebra merge-conflict blocked-by-other-PR WIP 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	139-84331 4 months ago	363-80206 11 months ago	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/)	t-algebra merge-conflict blocked-by-other-PR WIP 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	139-80305 4 months ago	363-80204 11 months ago	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 - [ ] depends on: #18534 - [ ] 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/)	t-algebra t-algebraic-geometry merge-conflict blocked-by-other-PR WIP 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	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	139-80301 4 months ago	unknown	unknown
26185	vasnesterov author:vasnesterov	feat(Counterexamples): Peano curve	Prove the existence of a continuous surjection from `unitInterval` onto `unitInterval × unitInterval`. --- - [ ] depends on: #26184 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	927/0	Counterexamples.lean,Counterexamples/PeanoCurve.lean,Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,scripts/noshake.json	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	132-7708 4 months ago	132-7709 4 months ago	0-1381 23 minutes
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/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	841/406	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean,docs/1000.yaml,docs/undergrad.yaml	7	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	132-7572 4 months ago	132-7572 4 months ago	0-52 52 seconds
26465	joelriou author:joelriou	feat(Algebra/Module): presentation of the `PiTensorProduct`	Given a presentation of a finite number of `R`-modules `M i`, we obtain a presentation of the module `⨂[R] i, M i`. --- - [ ] depends on: #26464 This PR continues the work from #18527. Original PR: https://github.com/leanprover-community/mathlib4/pull/18527	file-removed t-algebra merge-conflict 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	132-7442 4 months ago	132-7443 4 months ago	0-2063 34 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/)	file-removed t-algebra merge-conflict blocked-by-other-PR WIP 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	132-7440 4 months ago	132-7441 4 months ago	0-2 2 seconds
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/)	new-contributor t-measure-probability blocked-by-other-PR	467/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	1	['github-actions']	nobody	131-78030 4 months ago	131-78586 4 months ago	15-66224 15 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/)	new-contributor t-measure-probability blocked-by-other-PR	680/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Equiv.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	131-78030 4 months ago	131-78559 4 months ago	15-65390 15 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 - [ ] depends on: #26156 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	432/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	131-78029 4 months ago	131-78638 4 months ago	15-68781 15 days
24912	YaelDillies author:YaelDillies	feat: affine monoids	Define affine monoids as finitely generated cancellative torsion-free commutative monoids and prove a few of their basic properties: * An affine monoid with no non-trivial unit is generated by its irreducible elements * An affine monoid embeds into `ℤⁿ` for some `n` * Let `M` be an affine monoid. If `R` is a domain, then so is `R[M]`. From Toric Co-authored-by: Patrick Luo --- - [x] depends on: #24913 - [x] depends on: #24914 - [ ] depends on: #26110 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra blocked-by-other-PR label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/AffineMonoid/Basic.lean,Mathlib/Algebra/AffineMonoid/Embedding.lean,Mathlib/Algebra/AffineMonoid/Irreducible.lean,Mathlib/Algebra/AffineMonoid/UniqueSums.lean	5	15	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	131-70526 4 months ago	148-52738 4 months ago	7-26907 7 days
10654	smorel394 author:smorel394	feat(LinearAlgebra/{ExteriorPower,LinearIndependent,TensorPower}): define the exterior powers of a module and prove some of their basic properties	This introduces the exterior powers of a module and proves some of their basic properties, in `LinearAlgebra/ExteriorPower/Basic.lean` and `LinearAlgebra/ExteriorPower/Generators.lean`. It also adds a lemma in `LinearAlgebra/LinearIndependent.lean` (`linearIndependent_of_dualFamily` : if a family of vectors admits a "dual" family of linear forms, then it is linearly independent) and a construction in `LinearAlgebra/TensorPower.lean` (`linearFormOfFamily` : the linear form on the tensor power of `M` obtained by multiplying a family of linear forms on `M`). # Main definitions ## In `LinearAlgebra/ExteriorPower/Basic.lean`: * `ExteriorPower R n M` is the `n`th exterior power of a `R`-module `M`, defined as `LinearMap.range (ExteriorAlgebra.ι R : M →ₗ[R] ExteriorAlgebra R M) ^ n`. We also introduce the notation `Λ[R]^n M` for `ExteriorPower R n M`. * `ExteriorPower.ιMulti` is the canonical alternating map on `M` with values in `Λ[R]^n M`. * `ExteriorPower.map`: functoriality of exterior powers with respect to linear maps between modules. * `ExteriorPower.toTensorPower`: linear map from the `n`th exterior power to the `n`th tensor power (coming from `MultilinearMap.alternatization` via the universal property of exterior powers). ## In `LinearAlgebra/ExteriorPower/Generators.lean`: * `ExteriorPower.BasisOfBasis`: If `b` is a basis of `M` (indexed by a linearly ordered type), the basis of the `n`th exterior power of `M` formed by the `n`-fold exterior products of elements of `b`. # Main theorems ## In `LinearAlgebra/ExteriorPower/Basic.lean`: * The image of `ExteriorPower.ιMulti` spans `Λ[R]^n M`. * `ExteriorPower.liftAlternatingEquiv` (universal property of the `n`th exterior power of `M`): the linear equivalence between linear maps from `Λ[R]^n M` to a module `N` and `n`-fold alternating maps from `M` to `N`. * `ExteriorPower.map_injective_field`: If `f : M →ₗ[R] N` is injective and `R` is a field, then `ExteriorPower.map n f` is injective. * `ExteriorPower.map_surjective`: If `f : M →ₗ[R] N` is surjective, then `ExteriorPower.map n f` is surjective. * `ExteriorPower.mem_exteriorPower_is_mem_finite`: Every element of `Λ[R]^n M` is in the image of `Λ[R]^n P` for some finitely generated submodule `P` of `M`. ## In `LinearAlgebra/ExteriorPower/Generators.lean`: * `ExteriorPower.Finite`: The `n`th exterior power of a finite module is a finite module. * `ExteriorPower.span_top_of_span_top` and `ExteriorPower.span_top_of_span_top'`: If a family of vectors spans `M`, then the family of its `n`-fold exterior products spans `Λ[R]^n M`. (We give versions in the exterior algebra and in the exterior power.) * `ExteriorPower.FreeOfFree`: If `M` is a free module, then so is its `n`th exterior power. * `ExteriorPower.FinrankOfFiniteFree`: If `R` satisfies the strong rank condition and `M` is finite free of rank `r`, then the `n`th exterior power of `M` is of finrank `Nat.choose r n`. * `ExteriorPower.ιMulti_family_linearIndependent_field`: If `R` is a field, and if `v` is a linearly independent family of vectors (indexed by a linearly ordered type), then the family of its `n`-fold exterior products is also linearly independent. - [x] depends on: #10744 - [ ] depends on: #11156 - [x] depends on: #18590 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict please-adopt blocked-by-other-PR label:t-algebra$	739/0	Mathlib.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Generators.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/LinearAlgebra/TensorPower.lean	5	46	['Ruben-VandeVelde', 'YaelDillies', 'bustercopley', 'eric-wieser', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'pink10000', 'smorel394']	eric-wieser assignee:eric-wieser	122-6137 3 months ago	344-37919 11 months ago	22-67320 22 days
26950	alreadydone author:alreadydone	Primitives of holomorphic functions and path integral	--- - [ ] depends on: #22782 - [x] depends on: #24983 - [ ] depends on: #22771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-topology merge-conflict blocked-by-other-PR WIP	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	n/a	['mathlib4-dependent-issues-bot']	nobody	121-74375 3 months ago	unknown	unknown
27070	vasnesterov author:vasnesterov	golf: use `order`	--- - [ ] depends on: #26580 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR WIP	619/466	Mathlib.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/ContinuedFractions/Computation/CorrectnessTerminating.lean,Mathlib/Algebra/ContinuedFractions/Computation/Translations.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Group/Subgroup/Ker.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Algebra/Lie/Ideal.lean,Mathlib/Algebra/Lie/IdealOperations.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/MvPolynomial/Degrees.lean,Mathlib/Algebra/MvPolynomial/Division.lean,Mathlib/Algebra/Order/Archimedean/Basic.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Indicator.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/IsNonarchimedean.lean,Mathlib/Algebra/Order/Star/Prod.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Algebra/Polynomial/CoeffMem.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/ValuativeCriterion.lean,Mathlib/AlgebraicTopology/SimplicialObject/Split.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/UniformLimitsDeriv.lean,Mathlib/Analysis/ConstantSpeed.lean,Mathlib/Analysis/Convex/StrictConvexBetween.lean,Mathlib/Analysis/Convex/Uniform.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Matrix.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MeanInequalitiesPow.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Normed/Group/Seminorm.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/CategoryTheory/SmallObject/Iteration/ExtendToSucc.lean,Mathlib/CategoryTheory/Subpresheaf/Equalizer.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean,Mathlib/Combinatorics/SimpleGraph/Girth.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Computability/Partrec.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/FinEnum/Option.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/Data/Int/WithZero.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/Matroid/Basic.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Factors.lean,Mathlib/Data/Nat/Multiplicity.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/PNat/Basic.lean,Mathlib/Data/Rat/Floor.lean,Mathlib/Data/Set/MemPartition.lean,Mathlib/Data/Sign.lean,Mathlib/Dynamics/TopologicalEntropy/Subset.lean,Mathlib/FieldTheory/Relrank.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/RingedSpace/Basic.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/ExteriorPower/Pairing.lean,Mathlib/LinearAlgebra/Matrix/Block.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Covering/LiminfLimsup.lean,Mathlib/MeasureTheory/Covering/Vitali.lean,Mathlib/MeasureTheory/Function/AEEqFun.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/AEEqOfLIntegral.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/Jacobian.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSeminorm/CompareExp.lean,Mathlib/MeasureTheory/Function/SimpleFunc.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Integral/Bochner/VitaliCaratheodory.lean	224	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	121-57788 3 months ago	121-57789 3 months ago	0-10 10 seconds
19607	madvorak author:madvorak	Block matrix 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 blocked-by-other-PR WIP	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	112-76746 3 months ago	112-76747 3 months ago	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/)	t-algebra merge-conflict blocked-by-other-PR WIP 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	112-75146 3 months ago	112-75146 3 months ago	0-2 2 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/)	t-algebra merge-conflict 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	111-18315 3 months ago	111-18316 3 months ago	0-333 5 minutes
10006	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): homotopy in quasicategories	Defined a homotopy between two 1-simplicies in a quasicategories, and proved the property of being homotopic forms an equivalence relation. --- - [ ] depends on: #9935 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict awaiting-author blocked-by-other-PR	898/1	Mathlib.lean,Mathlib/AlgebraicTopology/Homotopy.lean,Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialSet.lean	4	3	['joelriou', 'leanprover-community-mathlib4-bot']	nobody	105-68221 3 months ago	105-68221 3 months ago	0-0 0 seconds
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/)	t-logic blocked-by-other-PR	639/60	Mathlib.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/ModelTheory/FunctionalFormula.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	104-62422 3 months ago	104-62495 3 months ago	0-2300 38 minutes
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-analysis t-number-theory merge-conflict awaiting-author blocked-by-other-PR	937/0	Mathlib/NumberTheory/SelbergSieve/Basic.lean,Mathlib/NumberTheory/SelbergSieve/Selberg.lean,docs/references.bib	3	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	104-53728 3 months ago	104-53729 3 months ago	0-0 0 seconds
25486	VTrelat author:VTrelat	feat(SetTheory/ZFC/Integers): define integers in ZFC	Extend the model of ZFC with integers following the converse direction as for naturals. We first define a type and then build a set. We finally show that both representations have coercions in both direction: - define a proper type `ZFInt` representing integers based on `ZFNat × ZFNat` and following the usual construction of integers - add theorems on usual algebraic properties of integers - define a set `Int` and show that it matches-i.e. that it is isomorphic to-the type `ZFInt` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2003/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74785 3 months ago	101-74785 3 months ago	0-2067 34 minutes
25484	VTrelat author:VTrelat	feat(SetTheory/ZFC/Booleans): define Boolean algebra in ZFC	Extend the model of ZFC with Boolean algebra: - define a set 𝔹 of booleans - define a proper type `ZFBool` representing booleans - add theorems on usual algebraic properties of booleans - provide usual boolean notations like `⊤`, `⊥`, `∧`, `∨`, etc. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483	t-set-theory new-contributor merge-conflict blocked-by-other-PR	619/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	101-74776 3 months ago	101-74776 3 months ago	0-1523 25 minutes
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/)	t-analysis merge-conflict blocked-by-other-PR	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	101-74766 3 months ago	101-74766 3 months ago	0-0 0 seconds
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/)	t-ring-theory merge-conflict 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	100-76893 3 months ago	100-76893 3 months 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/)	t-ring-theory merge-conflict 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	100-76845 3 months ago	100-76845 3 months ago	0-3552 59 minutes
14089	callesonne author:callesonne	feat(Bicategory/Functorbicategory): define bicategory of pseudofunctors	This PR contains a definition of the bicategory of pseudofunctors, in the file `Bicategory/FunctorBicategory/Pseudo.lean`. It also moves the file `Bicategory/Functorbicategory.lean` to `Bicategory/FunctorBicategory/Oplax.lean`. --- - [x] depends on: #14028 - [x] depends on: #18250 - [x] depends on: #18252 - [x] depends on: #18253 - [ ] depends on: #18254 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	385/70	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	7	6	['callesonne', 'github-actions', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	nobody	100-22741 3 months ago	100-22742 3 months ago	9-2320 9 days
28208	Sebi-Kumar author:Sebi-Kumar	feat(Topology): add the definition `foldTrans` to concatenate finite sequences of paths	Add `foldTrans`, which folds the function `Path.trans` across a sequence of paths with compatible endpoints, corresponding to the concatenation of a finite sequence of paths. This is implemented with `Fin.dfoldl` from the Batteries library. Prove basic properties about `foldTrans` (i.e., how it behaves with respect to `Path.refl`, `Path.subpath`, and homotopies). --- To provide additional context, I am new to contributing to Mathlib, and I am doing so 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. My goal is to prove that the `n`-sphere is simply connected for `n > 1`, following the proof from Hatcher's "Algebraic Topology." - [ ] depends on: #27261 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology blocked-by-other-PR	259/0	Mathlib.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Subpath.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	95-24562 3 months ago	95-24563 3 months ago	0-2340 39 minutes
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/)	t-linter awaiting-CI merge-conflict blocked-by-other-PR	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', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	92-2751 3 months ago	92-2752 3 months ago	0-1 1 second
27996	grunweg author:grunweg	feat: check indentation in doc-strings, medium version	--- - [ ] depends on: #27898 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	816/505	Mathlib/Algebra/Algebra/Spectrum/Basic.lean,Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Group/Subgroup/Finite.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/CategoryTheory/Abelian/Basic.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Enriched/Opposite.lean,Mathlib/CategoryTheory/EpiMono.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Limits/ConeCategory.lean,Mathlib/CategoryTheory/Limits/Filtered.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Over.lean,Mathlib/CategoryTheory/Limits/Shapes/IsTerminal.lean,Mathlib/CategoryTheory/Limits/Shapes/WideEqualizers.lean,Mathlib/CategoryTheory/Limits/Types/Yoneda.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/Comma.lean,Mathlib/CategoryTheory/Thin.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/Quiver/Symmetric.lean,Mathlib/Condensed/Equivalence.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finset/NatAntidiagonal.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/Matrix/Composition.lean,Mathlib/Data/Multiset/Antidiagonal.lean,Mathlib/Data/Multiset/NatAntidiagonal.lean,Mathlib/Data/Num/Basic.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordnode.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/Defs.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Ideal/Prod.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Family.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/Tactic/Algebraize.lean,Mathlib/Tactic/Bound/Attribute.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	107	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	92-2626 3 months ago	92-2627 3 months ago	0-1 1 second
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/)	slow-typeclass-synthesis t-algebra merge-conflict 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	90-50606 2 months ago	486-22159 1 year ago	7-77799 7 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	new-contributor t-combinatorics blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	89-30366 2 months ago	89-36943 2 months ago	0-591 9 minutes
27557	chrisflav author:chrisflav	feat(RingTheory/KrullDimension): dimension of `R / (x)` for a nonzerodivisor	We show that if `R` is Noetherian and `x` is a nonzerodivisor contained in the Jacobson radical of `R`, then `dim R / (x) + 1 = dim R`. --- - [ ] depends on: #27538 - [ ] depends on: #27510 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict blocked-by-other-PR	509/1	Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/NonZeroDivisors.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	17	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	87-70083 2 months ago	101-48216 3 months ago	0-562 9 minutes
27542	chrisflav author:chrisflav	feat(RingTheory/KrullDimension): dimension of polynomial ring	We show that for a Noetherian ring `R`, `dim R[X] = dim R + 1`. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [ ] depends on: #27520 - [ ] depends on: #27538 - [ ] depends on: #27510 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict blocked-by-other-PR	474/3	Mathlib/Algebra/Module/SpanRank.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Order/KrullDimension.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/KrullDimension/Basic.lean,Mathlib/RingTheory/KrullDimension/PID.lean,Mathlib/RingTheory/KrullDimension/Polynomial.lean,Mathlib/RingTheory/Localization/AtPrime/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	17	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	87-70082 2 months ago	unknown	unknown
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	new-contributor t-logic merge-conflict awaiting-author blocked-by-other-PR	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	87-5409 2 months ago	87-5410 2 months ago	0-35689 9 hours
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 - [ ] depends on: #25732 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-category-theory merge-conflict blocked-by-other-PR	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	5	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	86-3942 2 months ago	86-3942 2 months ago	0-21 21 seconds
26719	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/PolynomialLaw/Basic): extends polynomial laws to arbitrary universes	The definition of polynomial laws restricts its operations to a fixed universe. This PR constructs the extension to any universe. This is part of the project of studying divided powers on rings, in particular, for studying the universal divided power algebra of a module. Co-authored-by: María-Inés de Frutos Fernández @mariainesdff --- - [x] depends on: #26717 - [ ] depends on: #26277 [![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	969/7	Mathlib.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean,Mathlib/RingTheory/PolynomialLaw/Basic.lean	8	4	['acmepjz', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	85-73612 2 months ago	100-77262 3 months ago	0-1757 29 minutes
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.	t-measure-probability blocked-by-other-PR	651/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Integral.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Variation/Lemmas.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	85-65323 2 months ago	90-26140 2 months ago	0-3692 1 hour
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/)	awaiting-bench t-algebra merge-conflict blocked-by-other-PR WIP 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	84-57244 2 months ago	365-61913 1 year ago	0-0 0 seconds
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/)	new-contributor t-algebra merge-conflict blocked-by-other-PR 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	84-41917 2 months ago	84-41918 2 months ago	43-26015 43 days
25488	VTrelat author:VTrelat	feat(SetTheory/ZFC/Rationals): define rationals in ZFC	Extend the model of ZFC with rationals: we define a proper type `ZFRat` representing integers based on pairs of `ZFInt` (enforcing the res to be nonzero) and following the usual construction of rationals. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #25483 - [ ] depends on: #25485 - [ ] depends on: #25486	t-set-theory new-contributor merge-conflict blocked-by-other-PR	2070/0	Mathlib/Data/Set/Prod.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Booleans.lean,Mathlib/SetTheory/ZFC/Integers.lean,Mathlib/SetTheory/ZFC/Rationals.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	83-6535 2 months ago	83-6535 2 months ago	0-1808 30 minutes
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	slow-typeclass-synthesis t-algebra t-analysis merge-conflict blocked-by-other-PR 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	82-68119 2 months ago	216-3669 7 months ago *	0-0 0 seconds *
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/)	large-import t-algebra merge-conflict blocked-by-other-PR 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	81-57941 2 months ago	81-57941 2 months ago	1-48447 1 day
28596	CBirkbeck author:CBirkbeck	Dedekind eta e2	We show that the logarithmic derivative of the Dedekind eta function equals the the Eisenstein series E2 (up to a constant). --- - [ ] depends on: #27606 - [ ] depends on: #26014 - [x] depends on: #28400 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	1236/22	Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/LogDeriv.lean,Mathlib/Analysis/Calculus/LogDerivUniformlyOn.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/DedekindEta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/RingTheory/EuclideanDomain.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean	22	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	77-61630 2 months ago	unknown	unknown
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/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	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	77-61504 2 months ago	77-61505 2 months 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/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	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	77-61503 2 months ago	77-61504 2 months 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/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	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	77-61502 2 months ago	77-61503 2 months 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/)	t-category-theory merge-conflict blocked-by-other-PR	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	77-33713 2 months ago	77-33714 2 months ago	0-584 9 minutes
27133	robin-carlier author:robin-carlier	feat(CategoryTheory/Monoidal/DayConvolution): `C ⊛⥤ V` is monoidal closed when `V` is	When `V` is a monoidal closed category admitting enough limits, we show that the type alias `C ⊛⥤ V` for functors `C ⥤ V` with Day convolution monoidal structure is monoidal closed using the API for `LawfulDayConvolutionClosedMonoidalCategoryStruct` developped in #27119. We expose the required data to exhibit (realization as a functor of) the internal hom as a suitable, and we port the lemmas that characterize its functoriality in that regard, as well as the evaluation and coevaluation morphisms. --- - [ ] depends on: #27119 - [ ] depends on: #26890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	77-33588 2 months ago	unknown	unknown
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/)	t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	77-33586 2 months ago	unknown	unknown
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/)	t-category-theory merge-conflict blocked-by-other-PR	1585/24	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/DayFunctor.lean	4	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	77-33585 2 months ago	unknown	unknown
26413	michaellee94 author:michaellee94	feat(Analysis/ODE/MaximalSolution): Existence of maximal solutions for ODE 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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author blocked-by-other-PR	746/1	Mathlib.lean,Mathlib/Analysis/ODE/MaximalSolution.lean,docs/undergrad.yaml	3	13	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'winstonyin']	nobody	74-38320 2 months ago	74-38321 2 months ago	0-5139 1 hour
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 large-import t-category-theory merge-conflict blocked-by-other-PR	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	73-73780 2 months ago	73-73781 2 months ago	11-15676 11 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	t-analysis t-number-theory merge-conflict blocked-by-other-PR	407/83	Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	73-40430 2 months ago	73-40431 2 months ago	3-375 3 days
27898	grunweg author:grunweg	feat: check indentation of doc-strings, basic version	Basic version of #27897 (which still has some false positives): let's land this before weeding out the other errors. --- - [x] depends on: #27895 - [x] depends on: #27901 - [ ] depends on: #27933 - a PR for adding clarifying newlines - some miscellaneous indentation changes [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter merge-conflict blocked-by-other-PR	510/268	Mathlib/Algebra/ContinuedFractions/Basic.lean,Mathlib/Algebra/Lie/Classical.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Module/LinearMap/Polynomial.lean,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/Basic.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/Sites/Grothendieck.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/List/Defs.lean,Mathlib/Data/List/EditDistance/Defs.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/Num/Basic.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordnode.lean,Mathlib/Data/PNat/Xgcd.lean,Mathlib/Data/Part.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Group/Action.lean,Mathlib/NumberTheory/FLT/Basic.lean,Mathlib/NumberTheory/RamificationInertia/Basic.lean,Mathlib/Order/Filter/Partial.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/RingTheory/DividedPowers/Basic.lean,Mathlib/Tactic/Bound/Attribute.lean,Mathlib/Tactic/ComputeDegree.lean,Mathlib/Tactic/Linter/DocString.lean,Mathlib/Tactic/MinImports.lean,Mathlib/Tactic/MoveAdd.lean,Mathlib/Tactic/RewriteSearch.lean,Mathlib/Tactic/Sat/FromLRAT.lean,Mathlib/Tactic/TermCongr.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,Mathlib/Util/Notation3.lean,Mathlib/Util/Superscript.lean,MathlibTest/DocString.lean,MathlibTest/slow_simp.lean	54	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	73-40429 2 months ago	73-40430 2 months ago	0-26 26 seconds
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/)	t-analysis merge-conflict blocked-by-other-PR WIP	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	72-25912 2 months ago	72-25913 2 months ago	0-0 0 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	69-73622 2 months ago	69-73624 2 months ago	0-0 0 seconds
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`. --- - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] 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/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	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	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-34782 2 months ago	66-34783 2 months ago	0-11 11 seconds
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.) --- TODO: move two helper results about embeddings to their proper place; perhaps even PR separately - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] depends on: #28853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	792/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.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	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-34781 2 months ago	66-34782 2 months ago	0-617 10 minutes
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	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	66-34780 2 months ago	66-34780 2 months ago	0-309 5 minutes
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/)	t-meta merge-conflict blocked-by-other-PR	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	64-80325 2 months ago	64-80326 2 months ago	0-705 11 minutes
28968	linesthatinterlace author:linesthatinterlace	refactor(Order/Hom/Basic): Replace `abbrev` with `def` in OrderEmbedding and OrderIso	--- - [ ] depends on: #28944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	258/200	Mathlib/Data/Sum/Order.lean,Mathlib/Order/FixedPoints.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Order.lean	4	5	['YaelDillies', 'github-actions', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	b-mehta and linesthatinterlace assignee:b-mehta assignee:linesthatinterlace	64-51298 2 months ago	64-51299 2 months ago	0-0 0 seconds
29204	ShreckYe author:ShreckYe	feat(GroupTheory/OrderOfElement): `Pi.orderOf_eq` and its related and depended-upon theorems related to `Pi`, `minimalPeriod`, and `IsPeriodicPt`	The need for `Pi.orderOf_eq` comes in helping prove the value of the order of a `ZMod` number when used with `ZMod.prodEquivPi`. At first I was only trying to prove `(a : (i : Fin n) → α i) : orderOf a = Finset.univ.lcm (fun i => orderOf (a i))`, but after seeing the "Corresponding `pi` lemmas" comment, I realized that this could be generalized to Pi-types (`Pi`) and also some related and dependent theorems are not implemented yet, so I went on to add and prove these referring to those similar ones for product types (`Prod`). --- - [ ] depends on: #29530	t-group-theory large-import t-dynamics merge-conflict blocked-by-other-PR	153/10	Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/Logic/Function/Iterate.lean	5	7	['ShreckYe', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	63-48020 2 months ago	63-48021 2 months ago	9-60153 9 days
29243	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Projection/Submodule): add `sup_orthogonal` for `ClosedSubmodules`	prove that the closed submodule generated by the orthogonal complements of two submodules is the orthogonal complement of the intersection. motivation: needed to define standard subspaces in a Hilbert space #29251 https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal`	merge-conflict blocked-by-other-PR	354/1	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	62-49854 2 months ago	62-49854 2 months ago	0-2553 42 minutes
29251	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/): define standard subspaces of a complex Hilbert space	define standard subspaces of a complex Hilbert space: a standard subspace `S` of `H` is a closed real subspace `S` such that `S ⊓ i S = ⊥` and `S ⊔ i S = ⊤`. prove that the symplectic complement of `S` is again a standard subspace and the double symplectic complement is itself. motivation: one can define a closable operator `x + i y ↦ x - i y` and develop an analogue of the Tomita-Takesaki modular theory for von Neumann algebras. By considering inclusions of standard subspaces, one can obtain unitary representations of various Lie groups. https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal` - [ ] depends on: #29243 for `sup_orthogonal` - [ ] depends on: #29235 for `mapEquiv`	merge-conflict blocked-by-other-PR	699/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/StandardSubspace.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	62-49731 2 months ago	62-49732 2 months ago	0-3098 51 minutes
28733	CBirkbeck author:CBirkbeck	E2 s transform	--- - [ ] depends on : #29115 - [ ] depends on: #27606 - [ ] depends on" #26014 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	2068/19	Mathlib.lean,Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/Complex/Norm.lean,Mathlib/Analysis/Complex/SummableUniformlyOn.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Module/Basic.lean,Mathlib/Analysis/Normed/Module/FiniteDimension.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/IccSums.lean,Mathlib/NumberTheory/LSeries/RiemannZeta.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Defs.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/E2.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean,Mathlib/NumberTheory/TsumDivsorsAntidiagonal.lean,Mathlib/Topology/Algebra/InfiniteConditionalSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean,Mathlib/Topology/Algebra/InfiniteSum/NatInt.lean,Mathlib/Topology/Algebra/Monoid/Defs.lean,Mathlib/Topology/UniformSpace/LimUnder.lean	24	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	62-48219 2 months ago	unknown	unknown
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/)	t-algebra merge-conflict blocked-by-other-PR WIP 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	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	56-65790 1 month ago	99-25698 3 months ago	0-53 53 seconds
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/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	894/16	Mathlib.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	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	56-58562 1 month ago	56-58564 1 month ago	0-25208 7 hours
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/)	large-import blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	56-17324 1 month ago	56-18692 1 month ago	0-4627 1 hour
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	54-67925 1 month ago	54-67925 1 month ago	0-2904 48 minutes
25900	pfaffelh author:pfaffelh	feat (Topology/Compactness/CompactSystem): Set system of finite unions of sets in a compact system is again a compact system	feat (Topology/Compactness/CompactSystem): The set system of finite unions of sets in a compact system is 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`). --- - [x] depends on: #24906 - [ ] depends on: #25899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24543. Original PR: https://github.com/leanprover-community/mathlib4/pull/24543	t-topology merge-conflict blocked-by-other-PR	996/66	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	8	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	50-18388 1 month ago	50-18388 1 month ago	0-850 14 minutes
25906	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 #25899). Streamline the definition of square cylinders in MeasureTheory/Constructions/Cylinders on the way. Co-authors: Rémy Degenne remy.degenne@inria.fr --- - [ ] depends on: #25899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24542. Original PR: https://github.com/leanprover-community/mathlib4/pull/24542	t-topology merge-conflict blocked-by-other-PR	716/65	Mathlib.lean,Mathlib/Data/Set/Accumulate.lean,Mathlib/Data/Set/Dissipate.lean,Mathlib/Data/Set/Prod.lean,Mathlib/MeasureTheory/Constructions/Cylinders.lean,Mathlib/MeasureTheory/Constructions/ProjectiveFamilyContent.lean,Mathlib/MeasureTheory/PiSystem.lean,Mathlib/Topology/Compactness/CompactSystem.lean	8	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	50-18386 1 month ago	50-18387 1 month ago	0-383 6 minutes
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 --- 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 RFC merge-conflict blocked-by-other-PR	439/22	Mathlib.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/AlgebraicCycle.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/AlgebraicGeometry/Scheme.lean,Mathlib/Topology/LocallyFinsupp.lean	6	6	['Raph-DG', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	49-78690 1 month ago	101-75043 3 months ago	0-366 6 minutes
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`. --- - [ ] depends on: #29969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT blocked-by-other-PR WIP	104/48	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/Topology/MetricSpace/Completion.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	49-49294 1 month ago	49-52757 1 month ago	0-2230 37 minutes
30001	vihdzp author:vihdzp	feat: concept generated by set of objects/attributes	--- - [ ] depends on: #29996 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	270/99	Mathlib/Order/Concept.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-72958 1 month ago	48-72959 1 month ago	0-375 6 minutes
28786	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): restate Turán's theorem in terms of `extremalNumber`	Restates the existing proof of Turán's theorem in terms of the extremal numbers of `⊤`: The `turanGraph` is, up to isomorphism, the unique extremal graph forbidding `⊤`. --- - [ ] depends on: #28719 - [x] depends on: #28785 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	63/46	Mathlib/Combinatorics/SimpleGraph/Extremal/Turan.lean	1	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	46-78371 1 month ago	46-81829 1 month ago	2-84097 2 days
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	- Show that the quotient of a groupoid is a groupoid in `CategoryTheory.Quotient`. - Define the free groupoid on a category in `CategoryTheory.Category.FreeGroupoid` and hence define the free-forgetful adjunction between `Grpd` and `Cat`. - 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] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	246/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-70927 1 month ago	45-70935 1 month ago	0-340 5 minutes
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/)	t-category-theory merge-conflict blocked-by-other-PR	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	45-49792 1 month ago	45-49793 1 month 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/)	t-category-theory merge-conflict blocked-by-other-PR	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	45-49790 1 month ago	45-49791 1 month 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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	45-49788 1 month ago	45-49789 1 month 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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-49663 1 month ago	unknown	unknown
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-49661 1 month ago	unknown	unknown
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-49660 1 month ago	unknown	unknown
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-49658 1 month ago	unknown	unknown
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-49656 1 month ago	unknown	unknown
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	45-49655 1 month ago	45-49656 1 month ago	0-1017 16 minutes
30077	agjftucker author:agjftucker	feat(Analysis/Calculus/ImplicitFunOfBivariate): define implicitFunOfBivariate	In this specialization of the implicit function theorem, to an equation involving a curried bivariate function, we make assumptions on each of the partial derivatives individually. Consequently it requires import of results depending on the mean value theorem, and is sequestered to its own file apart from `Implicit.lean`. --- - [ ] depends on: #26985 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	264/4	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Partial.lean,Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/Analysis/Calculus/ImplicitFunOfBivariate.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	45-41729 1 month ago	45-42144 1 month ago	0-749 12 minutes
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	t-ring-theory t-order blocked-by-other-PR	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	9	['faenuccio', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	faenuccio assignee:faenuccio	45-16847 1 month ago	45-19144 1 month ago	10-67838 10 days
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/)	bench-after-CI t-algebra awaiting-CI merge-conflict blocked-by-other-PR 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	45-12827 1 month ago	45-12827 1 month ago	0-0 0 seconds
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/)	large-import blocked-by-other-PR	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	3	['github-actions', 'mathlib4-dependent-issues-bot', 'scholzhannah']	nobody	44-63934 1 month ago	56-21269 1 month ago	0-1375 22 minutes
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/)	large-import t-category-theory merge-conflict blocked-by-other-PR	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	43-76060 1 month ago	43-76061 1 month ago	0-838 13 minutes
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 - [ ] 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) - [ ] 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/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	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	42-79714 1 month ago	42-82323 1 month ago	0-0 0 seconds
27634	agjftucker author:agjftucker	fix(Analysis/Calculus/Implicit): consistently rename {`map`, `fun`, `function`} to `fun`	There are several clear naming issues in the file Implicit.lean, such as ``` theorem prod_map_implicitFunction : ∀ᶠ p : F × G in 𝓝 (φ.prodFun φ.pt), φ.prodFun (φ.implicitFunction p.1 p.2) = p := ``` where `prod_map` and `prodFun` both refer to the same thing. In this PR I have done my best to resolve these as consistently as possible by renaming everything `map`, also everything `function`, to `fun`. This has the added benefit of making some long names a little shorter. In passing I rewrapped some comments and replaced `haveI` with `have` where it had been used like `haveI` in Lean 3. Moves: - ImplicitFunctionData -> ImplicitFunData - ImplicitFunctionData.implicitFunction -> ImplicitFunData.implicitFun - ImplicitFunctionData.prod_map_implicitFunction -> ImplicitFunData.prodFun_implicitFun - ImplicitFunctionData.left_map_implicitFunction -> ImplicitFunData.leftFun_implicitFun - ImplicitFunctionData.right_map_implicitFunction -> ImplicitFunData.rightFun_implicitFun - ImplicitFunctionData.implicitFunction_apply_image -> ImplicitFunData.implicitFun_apply_image - ImplicitFunctionData.implicitFunction_hasStrictFDerivAt -> ImplicitFunData.hasStrictFDerivAt_implicitFun - HasStrictFDerivAt.implicitFunctionDataOfComplemented -> HasStrictFDerivAt.implicitFunDataOfComplemented - HasStrictFDerivAt.implicitFunctionOfComplemented -> HasStrictFDerivAt.implicitFunOfComplemented - HasStrictFDerivAt.map_implicitFunctionOfComplemented_eq -> HasStrictFDerivAt.map_implicitFunOfComplemented_eq - HasStrictFDerivAt.eq_implicitFunctionOfComplemented -> HasStrictFDerivAt.eq_implicitFunOfComplemented - HasStrictFDerivAt.implicitFunctionOfComplemented_apply_image -> HasStrictFDerivAt.implicitFunOfComplemented_apply_image - HasStrictFDerivAt.to_implicitFunctionOfComplemented -> HasStrictFDerivAt.to_implicitFunOfComplemented - HasStrictFDerivAt.implicitFunction -> HasStrictFDerivAt.implicitFun - HasStrictFDerivAt.tendsto_implicitFunction -> HasStrictFDerivAt.tendsto_implicitFun - _root_.Filter.Tendsto.implicitFunction -> _root_.Filter.Tendsto.implicitFun - HasStrictFDerivAt.map_implicitFunction_eq -> HasStrictFDerivAt.map_implicitFun_eq - HasStrictFDerivAt.implicitFunction_apply_image -> HasStrictFDerivAt.implicitFun_apply_image - HasStrictFDerivAt.eq_implicitFunction -> HasStrictFDerivAt.eq_implicitFun - HasStrictFDerivAt.to_implicitFunction -> HasStrictFDerivAt.to_implicitFun --- - [ ] depends on: #26985 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	271/123	Mathlib/Analysis/Calculus/Implicit.lean,docs/1000.yaml,docs/overview.yaml,docs/undergrad.yaml	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	42-71817 1 month ago	42-71818 1 month ago	23-28425 23 days
27366	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupCohomology/Hilbert90): add Hilbert 90 for cyclic groups	Let `L/K` be a finite extension of fields. Before this PR, this file proves Noether's generalization of Hilbert's Theorem 90: that the 1st group cohomology $H^1(Aut_K(L), L^\times)$ is trivial. Hilbert's original statement was that if $L/K$ is Galois, and $Gal(L/K)$ is cyclic, generated by an element `σ`, then for every `x : L` such that $N_{L/K}(x) = 1,$ there exists `y : L` such that $x = y/σ(y).$ We prove that in this PR, using the fact that `H¹(G, A) ≅ Ker(N_A)/(ρ(g) - 1)(A)` for any finite cyclic group `G` with generator `g`, and then applying Noether's generalization. --- - [x] depends on: #27361 - [x] depends on: #27362 - [x] depends on: #27363 - [ ] depends on: #27364 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	417/8	Mathlib.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/RepresentationTheory/Homological/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/FiniteCyclic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	42-54775 1 month ago	82-54674 2 months ago	0-351 5 minutes
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/)	large-import t-category-theory awaiting-CI merge-conflict blocked-by-other-PR WIP	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	42-40933 1 month ago	42-40934 1 month ago	0-1160 19 minutes
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/)	large-import t-category-theory awaiting-CI merge-conflict blocked-by-other-PR WIP	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	42-40932 1 month ago	42-40932 1 month ago	0-537 8 minutes
28718	imbrem author:imbrem	Added 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	new-contributor t-category-theory awaiting-author blocked-by-other-PR	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	8	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	41-81533 1 month ago	41-81534 1 month ago	0-24930 6 hours
23177	faenuccio author:faenuccio	feat: more lemmas about ordered groups with zero	We add some order properties (mainly some `lt`) for types of the form `WithZero α`. Co-authored-by: María Inés de Frutos Fernández --- - [x] depends on: #26665 - [x] depends on: #26724 - [x] depends on: #26761 - [x] depends on: #26762 - [x] depends on: #26763 - [ ] depends on: #26777	large-import t-order awaiting-CI blocked-by-other-PR WIP	13/1	Mathlib/Algebra/Order/GroupWithZero/Unbundled/Basic.lean	1	46	['Vierkantor', 'YaelDillies', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	41-61615 1 month ago	60-56291 1 month ago	5-22106 5 days
25740	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations): `SimplexCategoryGenRel.toSimplexCategory` is an equivalence	We use the normal forms for morphisms in `SimplexCategoryGenRel` to prove that `SimplexCategoryGenRel.toSimplexCategory` is an equivalence. We prove in order that there exists unique lifts in `SimplexCategoryGenRel` of mono (resp. epis) in `SimplexCategory`, and use this to deduce fully faithfulness of `SimplexCategoryGenRel.toSimplexCategory` thanks to the existing epi-mono factorisation in `SimplexCategory`. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [ ] depends on: #25737 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #21747. Original PR: https://github.com/leanprover-community/mathlib4/pull/21747	t-algebraic-topology large-import merge-conflict blocked-by-other-PR	942/9	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	40-76436 1 month ago	40-76437 1 month ago	0-2 2 seconds
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/)	new-contributor t-measure-probability blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	40-14139 1 month ago	40-14140 1 month ago	0-0 0 seconds
30185	alreadydone author:alreadydone	feat(MathlibTest): kernel reduction of nsmul on elliptic curve over ZMod	Co-authored-by: @SteffenReith --- - [ ] depends on: #30144 - [ ] depends on: #30181 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry t-number-theory blocked-by-other-PR label:t-algebra$	138/83	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/Data/Int/GCD.lean,Mathlib/Data/Nat/BinaryRec.lean,Mathlib/Data/Nat/BitIndices.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Nat/Size.lean,MathlibTest/EllipticCurve.lean	11	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	39-69942 1 month ago	39-69942 1 month ago	0-1 1 second
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	t-algebra t-analysis t-number-theory merge-conflict blocked-by-other-PR WIP 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	39-27336 1 month ago	121-29405 3 months ago	0-1386 23 minutes
27314	pechersky author:pechersky	feat(TopologyValued): `Valued` based on a range topology	Switch from a topology based on `fun γ : Γ₀ˣ => (v.ltAddSubgroup γ : AddSubgroup R)` to ``` fun rs : {rs : R × R // v rs.1 ≠ 0 ∧ v rs.2 ≠ 0} ↦ (v.ltAddSubgroup (Units.mk0 (v rs.val.2 / v rs.val.1) (by simp [rs.prop])) : AddSubgroup R) ``` This is in preparation for using `IsValuativeTopology` instead. In fact, that basis is precisely what `ValuativeTopology` asserts. `Valued.mk'` is kept, we do not yet rely on `IsValuativeTopology` and `UniformSpace`. The new `Valued` behaves the same way as it did before for `MulArchimedean` valuation codomains, which are all of the current in-mathlib uses of `Valued`. This is, for rank-one valuations. For valuations which rank one, but do not pass to the whole codomain, there are helper lemmas to discuss open/closed/clopen sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #27264 - [x] depends on: #27265 - [ ] depends on: #27163 - [x] depends on: #27339	t-topology merge-conflict 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	38-60387 1 month ago	95-53590 3 months ago	0-22127 6 hours
25143	chrisflav author:chrisflav	feat(RingTheory): smooth algebras have smooth Noetherian models	Co-authored by: Judith Ludwig --- - [ ] depends on: #24794 - [ ] depends on: #25138 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	596/45	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Subalgebra/Tower.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/RingTheory/AlgebraicIndependent/Transcendental.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Core.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/MvPolynomial/Homogeneous.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Smooth/Kaehler.lean,Mathlib/RingTheory/Smooth/NoetherianDescent.lean,Mathlib/RingTheory/Spectrum/Prime/ChevalleyComplexity.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Basic.lean	21	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	37-76945 1 month ago	100-76959 3 months ago	0-713 11 minutes
30112	gaetanserre author:gaetanserre	feat(Probability.Kernel): add representation of kernel as a map of a uniform measure	Add results about isolation of kernels randomness. In particular, it shows that one can write a Markov kernel as the map by a deterministic of a uniform measure on `[0, 1]`. It corresponds to Lemma 4.22 in "[Foundations of Modern Probability](https://link.springer.com/book/10.1007/978-3-030-61871-1)" by Olav Kallenberg, 2021. --- I'm not 100% convinced by either the names of the entries or their placement. I imagine @RemyDegenne will have something to say about this. - [ ] depends on: #27516 For a rational approximation characterization of suprema in the unit interval [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	172/0	Mathlib.lean,Mathlib/MeasureTheory/Constructions/UnitInterval.lean,Mathlib/Probability/Kernel/Representation.lean,Mathlib/Topology/UnitInterval.lean	4	4	['RemyDegenne', 'gaetanserre', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-75355 1 month ago	43-66009 1 month ago	0-318 5 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 - [ ] depends on: #27021 Baby version of #27025. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-58244 1 month ago	106-46739 3 months ago	0-696 11 minutes
27025	grunweg author:grunweg	feat: Gram-Schmidt procedure on smooth vector bundles yields smooth sections	For the Gram-Schmidt process on a vector bundle, deduce that smoothness of the bundle metric implies smoothness of the resulting sections. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot --- A few sorries remain to prove the continuous case. - [ ] 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/)	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	5	['faenuccio', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	36-58195 1 month ago	107-60296 3 months ago	0-316 5 minutes
16553	grunweg author:grunweg	WIP: tinkering with orientable manifolds	- wait for Rida's PR to get merged - PR the "normed space" part separately - WIP: a linear isomorphism on a connected set is either orientation-preserving or orientation-preserving: this will require #8738, it seems - [ ] depends on: #16239 - [ ] depends on: #8738 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	287/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	36-58126 1 month ago	36-58127 1 month ago	0-0 0 seconds
30334	kckennylau author:kckennylau	feat(RingTheory): define maps of homogeneous ideals	In this file we define `HomogeneousIdeal.map` and `HomogeneousIdeal.comap`, similar to and based on the existing `Ideal.map` and `Ideal.comap`. More concretely, a graded ring homomorphism `𝒜 →+*ᵍ ℬ` induces a "Galois connection" between the homogeneous ideals in `𝒜` and the homogeneous ideals in `ℬ`. --- Split from #26061. - [ ] depends on: #30312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	441/0	Mathlib.lean,Mathlib/RingTheory/GradedAlgebra/Hom.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Maps.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	36-25331 1 month ago	36-53963 1 month ago	0-1744 29 minutes
30312	kckennylau author:kckennylau	feat(RingTheory): define graded ring homomorphisms	This PR defines graded ring homomorphisms, which are ring homomorphisms that preserve the grading. We also provide the basic properties (aka the "API"). Zulip discussion: [#mathlib4 > Graded Ring Hom](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Graded.20Ring.20Hom/with/543601500) --- Split from #26061. - [ ] depends on: #30355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	360/0	Mathlib.lean,Mathlib/Data/FunLike/GradedFunLike.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	3	6	['github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	35-75472 1 month ago	35-76542 1 month ago	1-46922 1 day
30365	kckennylau author:kckennylau	feat(RingTheory): define R-linear graded algebra homomorphism	This PR defines R-linear graded algebra homomorphisms, which are R-algebra homomorphisms that preserve the grading. We also provide the basic properties (aka the "API"). Zulip discussion: [#mathlib4 > redefine Graded Algebra](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/redefine.20Graded.20Algebra/near/543847326) --- Split from #26061. - [ ] depends on: #30355 - [ ] depends on: #30312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	642/0	Mathlib.lean,Mathlib/Data/FunLike/GradedFunLike.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-66465 1 month ago	35-69362 1 month ago	0-578 9 minutes
30367	kckennylau author:kckennylau	feat(Data): define grading-preserving isomorphisms	The class `GradedEquivLike E 𝒜 ℬ` says that `E` is a type of grading-preserving isomorphisms between `𝒜` and `ℬ`. It is the combination of `GradedFunLike E 𝒜 ℬ` and `EquivLike E A B`. --- - [ ] depends on: #30355 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data blocked-by-other-PR	78/0	Mathlib.lean,Mathlib/Data/FunLike/Graded.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-64871 1 month ago	35-64872 1 month ago	0-3399 56 minutes
30010	xroblot author:xroblot	feat(CyclotomicFields): generalize `IsPrimitiveRoot.integralPowerBasis` to all (nonzero) integers	--- - [ ] depends on: #29997	large-import t-number-theory merge-conflict blocked-by-other-PR	1278/87	Mathlib.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/NumberTheory/Cyclotomic/Basic.lean,Mathlib/NumberTheory/Cyclotomic/Rat.lean,Mathlib/NumberTheory/NumberField/Discriminant/Different.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/DedekindDomain/Ideal/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/DedekindDomain/LinearDisjoint.lean,Mathlib/RingTheory/FractionalIdeal/Extended.lean,Mathlib/RingTheory/Ideal/GoingUp.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Trace/Basic.lean,Mathlib/RingTheory/UniqueFactorizationDomain/NormalizedFactors.lean	20	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	35-54122 1 month ago	35-54123 1 month ago	0-1706 28 minutes
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. - [ ] depends on: #30355 - [ ] depends on: #30312 - [ ] depends on: #30367 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	825/0	Mathlib.lean,Mathlib/Data/FunLike/Graded.lean,Mathlib/RingTheory/GradedAlgebra/RingEquiv.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-28858 1 month ago	35-48501 1 month ago	0-3140 52 minutes
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	large-import t-algebra t-topology t-number-theory merge-conflict blocked-by-other-PR 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	34-71808 1 month ago	34-71809 1 month ago	0-1600 26 minutes
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/)	new-contributor merge-conflict blocked-by-other-PR	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	34-55271 1 month ago	57-71684 1 month ago	0-396 6 minutes
30356	grunweg author:grunweg	feat: follow-up to #28793	Proves two API lemmas which were requested in #28793, and split out of that PR to keep the diff smaller. --- - [ ] depends on: #28793 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	518/0	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	33-36417 1 month ago	36-10775 1 month ago	0-2081 34 minutes
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 - [ ] depends on: #28793 - [ ] depends on: #30356 (for simplicity) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	689/1	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,docs/overview.yaml,docs/references.bib	8	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	33-32335 1 month ago	43-59342 1 month ago	0-1 1 second
26966	vihdzp author:vihdzp	feat: the Dedekind–MacNeille completion	We define the type of Dedekind cuts `DedekindCut α` as an abbreviation for `Concept α α (· ≤ ·)`. We prove that it's the smallest complete lattice containing a given partial order, in the sense that any embedding from `α` into a complete lattice factors through it. --- The idea here is that one should be able to work with Dedekind cuts without knowing what a concept lattice is; whence the abbreviation. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Dedekind-MacNeille.20completion.2E/near/528004148). - [ ] depends on: #30001 - [ ] depends on: #29995 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author blocked-by-other-PR	500/104	Mathlib.lean,Mathlib/Order/Completion.lean,Mathlib/Order/Concept.lean	3	22	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	32-13937 1 month ago	40-65793 1 month ago	0-19769 5 hours
28853	grunweg author:grunweg	feat: product of immersions is an immersion	--- - [ ] depends on: #28793 - [ ] depends on: #30356 (for simplicity) - [x] depends on: #28840 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	649/0	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Topology/OpenPartialHomeomorph.lean,docs/references.bib	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	31-64894 1 month ago	33-34023 1 month ago	0-1911 31 minutes
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/)	t-analysis merge-conflict blocked-by-other-PR	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	30-12702 30 days ago	30-12703 30 days ago	0-2474 41 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 - [ ] depends on: #30356 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR	688/23	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/Notation.lean,MathlibTest/DifferentialGeometry/Notation.lean,docs/references.bib	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	28-73892 28 days ago	28-73893 28 days ago	0-13 13 seconds
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/)	t-analysis blocked-by-other-PR	193/0	Mathlib/Analysis/Calculus/ParametricIntegral.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	28-52798 28 days ago	28-52800 28 days ago	0-7778 2 hours
28152	Sebi-Kumar author:Sebi-Kumar	feat(AlgebraicTopology): characterize simply connectedness in terms of loops	Show that a space is simply connected if and only if all loops within that space are homotopic to the constant loop. To be used in a proof that the `n`-sphere is simply connected for `n > 1`. --- This code was written at the University of Western Ontario as a part of the Fields Undergraduate Summer Research Program under the supervision of Chris Kapulkin and Daniel Carranza. - [ ] depends on: #28126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict blocked-by-other-PR	37/5	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-44387 26 days ago	26-44387 26 days ago	0-2854 47 minutes
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 SetTheory 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. - [ ] depends on: #28208 - [ ] depends on: #28198 - [ ] depends on: #28185 - [ ] depends on: #28152 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology new-contributor merge-conflict blocked-by-other-PR	639/6	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnected.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SimplyConnectedSphere.lean,Mathlib/Analysis/InnerProductSpace/PiL2.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/FoldTrans.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/Subpath.lean	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	26-44385 26 days ago	26-44386 26 days ago	0-23 23 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/)	t-data tech debt merge-conflict blocked-by-other-PR	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	26-5009 26 days ago	437-41294 1 year ago	0-0 0 seconds
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	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	24-37477 24 days ago	29-60549 29 days ago	4-45292 4 days
30658	grunweg author:grunweg	chore: rebase and continuation of #26926 (more spacing fixes)	--- - [x] depends on: #30663 - [x] depends on: #30685 - [x] depends on: #30687 - [x] depends on: #30688 - [x] depends on: #30689 - [ ] depends on: #30690 - [x] depends on: #30691 - [x] depends on: #30723 - [x] depends on: #30724 - [x] depends on: #30725 After that, virtually all whitespace changes are Damiano's, so I'll split those into nice pieces, review and maintainer merge. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	2771/685	Mathlib/Algebra/Category/ModuleCat/ChangeOfRings.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Divisibility/Basic.lean,Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Commute/Defs.lean,Mathlib/Algebra/Group/Hom/CompTypeclasses.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Semiconj/Basic.lean,Mathlib/Algebra/Group/Semiconj/Units.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Notation/Pi/Defs.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Ext.lean,Mathlib/Analysis/InnerProductSpace/Laplacian.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Removal.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Fin/Tuple/Curry.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Insert.lean,Mathlib/Data/Finset/Lattice/Basic.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Destutter.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/List/Perm/Basic.lean,Mathlib/Data/List/Rotate.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/List/TakeWhile.lean,Mathlib/Data/Multiset/Basic.lean,Mathlib/Data/Multiset/UnionInter.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Choose/Mul.lean,Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Data/Nat/Log.lean,Mathlib/Data/Nat/Sqrt.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Option/Basic.lean,Mathlib/Data/PSigma/Order.lean,Mathlib/Data/Part.lean,Mathlib/Data/Prod/Basic.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/Data/TypeVec.lean,Mathlib/Data/Vector/Basic.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/Geometry/Manifold/PoincareConjecture.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/GroupTheory/FixedPointFree.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/PushoutI.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/SpecificGroups/Quaternion.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/CliffordAlgebra/EvenEquiv.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Prod.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/FreeProduct/Basic.lean	201	4	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	21-73405 21 days ago	23-81268 23 days ago	0-10092 2 hours
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 - [ ] depends on: #26332 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic merge-conflict blocked-by-other-PR	529/8	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean,scripts/noshake.json	5	8	['Timeroot', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	nobody	20-63361 20 days ago	20-63362 20 days ago	3-12935 3 days
27100	staroperator author:staroperator	feat(ModelTheory): Presburger definability and semilinear sets	This PR formalizes the equivalence between Presburger definable sets and semilinear sets. As an application of this result, we show that the graph of multiplication is not Presburger definable in ℕ. --- - [x] depends on: #26896 - [x] depends on: #27081 - [x] depends on: #27087 - [ ] depends on: #27414 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	1667/7	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Definability.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Nat.lean,Mathlib/Order/WellFoundedSet.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean,docs/references.bib	12	6	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	19-55548 19 days ago	19-55549 19 days ago	0-1811 30 minutes
30925	callesonne author:callesonne	feat(Bicategory/InducedBicategory): add induced bicategories	This PR adds a way of inducing a full bicategory structure on given type of objects with a map to the objects of some bicategory (i.e. with all 1-morphisms and all 2-morphisms). I have not tried to implement "locally induced bicategories" which should allow for a sub-class of 1-morphisms as well. This is because copying the naive approach and replacing the map F as for induced categories with a functor, one runs into issues when the equalities in F.map_comp and F.map_id are not defeq equalities. One could probably define locally full sub-bicategories using a pair of ObjectProperty + MorphismProperty to ensure that the inclusions are actually defeq, but I did not want to get into this. This is the migration of #25603 to a fork. --- - [ ] depends on: #30132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	276/2	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/InducedBicategory.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	18-67143 18 days ago	18-67144 18 days ago	0-3128 52 minutes
27510	chrisflav author:chrisflav	feat(RingTheory/Height): height of ideal is height of preimage plus height in quotient	If `S` has going-down over `R`, the height of a prime `P` lying over `p` equals the height of `p` plus the height of the image of `P` in `S / p S`. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [ ] depends on: #22300 - [ ] depends on: #27508 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory large-import merge-conflict blocked-by-other-PR	192/1	Mathlib/Data/Finset/Card.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Logic/Function/Basic.lean,Mathlib/RingTheory/Ideal/GoingDown.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Basic.lean,Mathlib/RingTheory/Ideal/Over.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	18-50818 18 days ago	18-50818 18 days ago	0-1531 25 minutes
30898	vihdzp author:vihdzp	feat: characterization of `List.splitBy`	--- - [ ] depends on: #30892 Moved from #16837. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict blocked-by-other-PR	118/4	Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	18-35693 18 days ago	18-35693 18 days ago	0-2502 41 minutes
26872	faenuccio author:faenuccio	chore(RingTheory/Valuation/RankOne): modify the definition of Valuation.RankOne using its range rather than its codomain	We modify the definition of `RankOne` for a valuation in terms of its `valueGroup` rather than its codomain. Co-authored by María Inés de Frutos Fernández @mariainesdff - [ ] depends on: #26588 - [x] depends on: #26980 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	257/34	Mathlib.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/Range.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean	7	14	['faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	17-73627 17 days ago	17-73650 17 days ago	0-117 1 minute
30092	grunweg author:grunweg	feat: enable the flexible linter	#28962 but with commits squashed: do not merge! --- - [x] depends on: #30091 - [x] depends on: #30106 - [ ] depends on: #28962 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	314/44	Archive/Arithcc.lean,Archive/Examples/Eisenstein.lean,Archive/Examples/IfNormalization/Result.lean,Archive/Imo/Imo1997Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q5.lean,Counterexamples/MapFloor.lean,Mathlib/Algebra/Field/GeomSum.lean,Mathlib/Algebra/FreeAlgebra.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Homology/Augment.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/LinearRecurrence.lean,Mathlib/Algebra/Polynomial/Bivariate.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Exponential.lean,Mathlib/Analysis/Complex/JensenFormula.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/InnerProductSpace/Rayleigh.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/PosPart/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/IntegralRepresentation.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Log/PosLog.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Comma/Over/Pullback.lean,Mathlib/CategoryTheory/Dialectica/Monoidal.lean,Mathlib/CategoryTheory/Galois/Basic.lean,Mathlib/CategoryTheory/Limits/Constructions/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Grothendieck.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Braided.lean,Mathlib/CategoryTheory/Products/Basic.lean,Mathlib/Combinatorics/Additive/Corner/Roth.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Additive/VerySmallDoubling.lean,Mathlib/Combinatorics/SetFamily/FourFunctions.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Data/Bool/Count.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Matrix/Basis.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/Digits/Lemmas.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/PEquiv.lean,Mathlib/Data/Rat/Cast/CharZero.lean,Mathlib/Data/Seq/Basic.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/WSeq/Basic.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/MFDeriv/Basic.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/Init.lean,Mathlib/LinearAlgebra/CliffordAlgebra/Basic.lean,Mathlib/LinearAlgebra/Contraction.lean,Mathlib/Logic/Equiv/List.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Real.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Periodic.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Basic.lean	127	14	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	17-70626 17 days ago	17-70627 17 days ago	0-0 0 seconds
29687	vihdzp author:vihdzp	feat: standard part in non-Archimedean field	We define `ArchimedeanClass.standardPart x` as the unique real number with an infinitesimal difference from `x`. This generalizes `Hyperreal.st` for a general (non-)archimedean field. --- - [x] depends on: #29611 - [x] depends on: #29685 - [ ] depends on: #29735 - [x] depends on: #30486 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	457/1	Mathlib.lean,Mathlib/Algebra/Order/CompleteField.lean,Mathlib/Algebra/Order/Ring/Archimedean.lean,Mathlib/Data/Real/CompleteField.lean,Mathlib/Data/Real/StandardPart.lean,Mathlib/Order/Quotient.lean	6	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	17-58958 17 days ago	17-60534 17 days ago	0-0 0 seconds
30985	erdOne author:erdOne	feat(AlgbraicGeometry), `Hom(-, X)` commutes with inverse limits for schemes of finite presentation	--- - [ ] depends on: #30988 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry blocked-by-other-PR	523/28	Mathlib/AlgebraicGeometry/AffineTransitionLimit.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	17-23211 17 days ago	17-23212 17 days ago	0-4846 1 hour
30204	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring/EqualizerPushout): add effectiveEpi_of_faithfullyFlat in CommRingCatᵒᵖ	This PR proves that any map `f : S ⟶ R` in `CommRingCatᵒᵖ` with faithfully flat `f.unop : R.unop ⟶ S.unop` is an effective epimorphism. Main results: - `CommRingCat.Equalizer.isLimitForkPushoutSelfOfFaithfullyFlat` : If `f : R ⟶ S` is a faithfully flat map in `CommRingCat`, then `Fork.ofι f pushout.condition` is an equalizer diagram. - `CommRingCat.Opposite.effectiveEpi_of_faithfullyFlat` : Any map `f : S ⟶ R` in `CommRingCatᵒᵖ` with faithfully flat `f.unop : R.unop ⟶ S.unop` is an effective epimorphism. --- - [ ] depends on: #29960 - [x] depends on: #30200	blocked-by-other-PR	400/1	Mathlib.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	17-10528 17 days ago	17-10546 17 days ago	0-1375 22 minutes
30462	grunweg author:grunweg	Everything I wanted about immersions	Nothing to see yet, just for my own tracking (and for getting the cache). Ideally, this branch would become obsolete as all dependent PRs get merged :-) TODO: also cherry-pick the elaborators... --- - [ ] depends on: #28865 - [ ] depends on: #30413 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	1783/286	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.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/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Topology/OpenPartialHomeomorph.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,docs/overview.yaml,docs/references.bib	16	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-74366 16 days ago	30-46342 30 days ago	0-2567 42 minutes
30981	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Bisector): oriented angle bisection mod π	Add lemmas relating equal distance to two lines to bisecting the angle between them mod π (expressed as usual as equality of twice angles), building on the previous lemmas (#30477) dealing with bisection mod 2π. --- - [ ] depends on: #30474 - [ ] depends on: #30477 - [ ] depends on: #30600 - [ ] depends on: #30703 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-euclidean-geometry blocked-by-other-PR	252/3	Mathlib/Geometry/Euclidean/Angle/Bisector.lean	1	3	['github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	nobody	16-72811 16 days ago	17-40563 17 days ago	0-331 5 minutes
30982	jsm28 author:jsm28	feat(Geometry/Euclidean/Angle/Incenter): angle bisection and the incenter	Add lemmas relating the incenter and excenters of a simplex to angle bisection, both generally for a simplex and more specifically with oriented angles for a triangle. More specific lemmas for a simplex (identifying exactly which excenter corresponds to which bisectors) will require various additional API for bisectors of angles betweeen oriented affine subspaces (but for the most common applications to typical plane geometry problems, I expect the triangle lemmas with oriented angles to be more useful). --- - [ ] depends on: #30474 - [ ] depends on: #30477 - [ ] depends on: #30600 - [ ] depends on: #30703 - [ ] depends on: #30938 - [ ] depends on: #30981 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-euclidean-geometry blocked-by-other-PR	525/3	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Bisector.lean,Mathlib/Geometry/Euclidean/Angle/Incenter.lean	3	3	['github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	nobody	16-72782 16 days ago	17-37726 17 days ago	0-2478 41 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/)	new-contributor merge-conflict blocked-by-other-PR	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	16-71437 16 days ago	16-71438 16 days ago	0-340 5 minutes
30357	grunweg author:grunweg	chore: golf using custom elaborators	Test the elaborators on a large scale by trying them out. Benchmarking results so far are very positive! The elaborators mostly work very well. They do not handle products yet (that's a known issue). Unexpected errors: - the defeq check on the set fails in `Riemannian/Basic.lean`; TODO minimise and investigate --- XXX: revert ContMDiffOn.smul_section_of_tsupport rename! - [ ] depends on: #30463 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-differential-geometry merge-conflict blocked-by-other-PR	2327/1311	Mathlib/Analysis/Complex/UpperHalfPlane/Manifold.lean,Mathlib/Analysis/Distribution/AEEqOfIntegralContDiff.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/BumpFunction.lean,Mathlib/Geometry/Manifold/Complex.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Constructions.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/GroupLieAlgebra.lean,Mathlib/Geometry/Manifold/Instances/Icc.lean,Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/Geometry/Manifold/MFDeriv/Tangent.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/Geometry/Manifold/Riemannian/Basic.lean,Mathlib/Geometry/Manifold/Riemannian/PathELength.lean,Mathlib/Geometry/Manifold/Sheaf/Smooth.lean,Mathlib/Geometry/Manifold/VectorBundle/Hom.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Geometry/Manifold/VectorBundle/Riemannian.lean,Mathlib/Geometry/Manifold/VectorBundle/SmoothSection.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/Geometry/Manifold/VectorField/LieBracket.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean,Mathlib/Geometry/Manifold/WhitneyEmbedding.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/MDifferentiable.lean,Mathlib/NumberTheory/ModularForms/JacobiTheta/Manifold.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,build.yml,small diffeo tasks-projects for newbes.md,test.lean	45	10	['github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-71436 16 days ago	16-71437 16 days ago	0-287 4 minutes
30900	vihdzp author:vihdzp	feat: run-length encoding	--- - [ ] depends on: #30898 Moved from #17105. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data merge-conflict blocked-by-other-PR	280/4	Mathlib.lean,Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/RunLength.lean,Mathlib/Data/List/SplitBy.lean	4	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'plp127']	nobody	16-66432 16 days ago	18-35692 18 days ago	0-2418 40 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. - [ ] depends on: #30355 - [ ] depends on: #30173 - [ ] depends on: #30302 - [ ] depends on: #30312 - [ ] depends on: #30322 - [ ] depends on: #30334 - [ ] depends on: #30336 - [ ] depends on: #30352 - [ ] depends on: #30365 - [ ] depends on: #30367 - [ ] depends on: #30379 - [ ] depends on: #30399 - [ ] depends on: #30408 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry blocked-by-other-PR WIP	2009/0	Mathlib.lean,Mathlib/AlgebraicGeometry/ProjectiveSpace.lean	2	15	['callesonne', 'erdOne', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot']	erdOne assignee:erdOne	16-58889 16 days ago	37-51729 1 month ago	110-81419 110 days
26860	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define associated graded module	Define the associated graded module to a filtered module. --- - [ ] depends on: #26858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #20940	t-algebra blocked-by-other-PR label:t-algebra$	665/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-55530 16 days ago	unknown	unknown
30399	kckennylau author:kckennylau	feat(RingTheory): make HomogeneousLocalization.map take a graded ring hom	and also make `Away.map`. --- - [ ] depends on: #30302 - [ ] depends on: #30312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	526/133	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/Data/FunLike/GradedFunLike.lean,Mathlib/RingTheory/GradedAlgebra/FiniteType.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-53146 16 days ago	16-53148 16 days ago	0-356 5 minutes
31019	vihdzp author:vihdzp	feat: colex order on finsupps	--- - [ ] depends on: #30482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	201/20	Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Order/PiLex.lean,Mathlib/Order/Synonym.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	16-50849 16 days ago	16-51097 16 days ago	0-571 9 minutes
30649	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): adjoin -1 to a subgroup	Given a subgroup of GL(2, R), form the subgroup generated by it and `-1`. Using this, define the width of a subgroup. --- - [x] depends on: #30461 - [x] depends on: #30466 - [ ] depends on: #30471 - [ ] depends on: #30648	t-number-theory blocked-by-other-PR	297/2	Mathlib/NumberTheory/ModularForms/ArithmeticSubgroups.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-30408 16 days ago	23-43731 23 days ago	0-1124 18 minutes
26858	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define the associated graded ring to filtered ring	Define the associated graded ring to a filtered ring. --- - [ ] depends on: #26857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #20913	t-algebra blocked-by-other-PR label:t-algebra$	446/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15700 16 days ago	unknown	unknown
26859	Thmoas-Guan author:Thmoas-Guan	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: #26858 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #21806	t-algebra blocked-by-other-PR label:t-algebra$	559/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean	2	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15672 16 days ago	unknown	unknown
26861	Thmoas-Guan author:Thmoas-Guan	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 Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26857 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22632	t-algebra blocked-by-other-PR label:t-algebra$	360/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15573 16 days ago	16-63457 16 days ago	0-1200 20 minutes
26862	Thmoas-Guan author:Thmoas-Guan	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 Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26858 - [ ] depends on: #26861 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22208	t-algebra blocked-by-other-PR label:t-algebra$	816/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15542 16 days ago	unknown	unknown
26863	Thmoas-Guan author:Thmoas-Guan	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: #26859 - [ ] depends on: #26862 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22454	t-algebra blocked-by-other-PR label:t-algebra$	1046/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15523 16 days ago	unknown	unknown
26867	Thmoas-Guan author:Thmoas-Guan	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: #26860 - [ ] depends on: #26862 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22893	t-algebra blocked-by-other-PR label:t-algebra$	1196/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15487 16 days ago	unknown	unknown
26868	Thmoas-Guan author:Thmoas-Guan	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 Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26861 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22707	t-algebra blocked-by-other-PR label:t-algebra$	516/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15476 16 days ago	unknown	unknown
26869	Thmoas-Guan author:Thmoas-Guan	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 Co-authored-by: Yi Yuan @yuanyi-350 Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #26868 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) migrated from #22972	t-algebra blocked-by-other-PR label:t-algebra$	715/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-15456 16 days ago	unknown	unknown
30579	smmercuri author:smmercuri	feat : `v.adicCompletionIntegers K` is compact when `K` is a number field	--- - [ ] depends on: #30576 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	766/23	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean,Mathlib/Topology/UniformSpace/Completion.lean	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-9663 16 days ago	16-9664 16 days ago	0-13 13 seconds
30766	dagurtomas author:dagurtomas	feat(CategoryTheory): transport closed monoidal structure along equivalence	--- - [ ] depends on: #30771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed blocked-by-other-PR	59/36	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Category/Cat/CartesianClosed.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Closed/Enrichment.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Groupoid.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Closed/Transport.lean,Mathlib/CategoryTheory/Monoidal/Closed/Types.lean,Mathlib/CategoryTheory/Monoidal/Closed/Zero.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Preadditive/Projective/Internal.lean,Mathlib/CategoryTheory/Sites/CartesianClosed.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/CartesianClosed.lean,Mathlib/Condensed/Light/CartesianClosed.lean	28	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-4776 16 days ago	16-4805 16 days ago	0-27 27 seconds
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: #30328 - [ ] depends on: #30327 - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] depends on: #30239 - [ ] depends on: #30236 - [ ] depends on: #30202 - [ ] depends on: #30201 - [ ] depends on: #30199 - [ ] 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	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	15-77940 15 days ago	33-39353 1 month ago *	0-1767 29 minutes *
30328	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): the inclusion of test functions into bounded continuous functions as a continuous linear map	--- - [ ] depends on: #30327 - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	815/5	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	15-77939 15 days ago	27-45416 27 days ago	0-1917 31 minutes
30327	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): add characterizations of continuity for linear maps on test functions	--- - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	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	15-77937 15 days ago	27-45418 27 days ago	0-64 1 minute
30325	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): Endow test functions with the canonical LF topology	--- - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	730/5	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	15-77936 15 days ago	27-45420 27 days ago	0-2560 42 minutes
30278	luigi-massacci author:luigi-massacci	feat: compactly supported C^n bundled maps ("test functions")	Add a file `TestFunction.lean` with a type of bundled C^n maps with compact support. --- - [ ] depends on: #30255 - [ ] 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/)	t-analysis merge-conflict blocked-by-other-PR	616/5	Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Set/Function.lean	5	6	['ADedecker', 'github-actions', 'luigi-massacci', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-77932 15 days ago	27-45422 27 days ago	0-62180 17 hours
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	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	15-77930 15 days ago	27-45423 27 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 --- - [ ] 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	454/3	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	15-77929 15 days ago	27-45425 27 days ago	0-599 9 minutes
30240	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add a wrapper for fderiv on D_K^n	Add a wrapper for `fderiv` as a map from `D_K^n` to `D_K^(n-1)`. Co-Authored by: @ADedecker --- - [ ] 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	406/3	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	15-77926 15 days ago	27-45428 27 days ago	0-546 9 minutes
30239	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add characterization of continuity for maps into D_K^n, continuity of inclusion into C_b	Add a characterization of continuity for maps into D_K^n, and continuity of the inclusion of D_K^n into C_b. Co-Authored by: @ADedecker --- - [ ] 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	310/3	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Data/Set/Function.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-77925 15 days ago	27-45429 27 days ago	0-512 8 minutes
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	large-import FLT t-number-theory merge-conflict blocked-by-other-PR	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	15-65688 15 days ago	50-52879 1 month ago	0-3752 1 hour
31056	jsm28 author:jsm28	feat(Geometry/Euclidean/Altitude): `reindex` lemmas	Add lemmas about `altitude`, `altitudeFoot` and `height` applied to `Simplex.reindex`. --- - [ ] depends on: #31054 - [ ] depends on: #31055 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	41/0	Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-61697 15 days ago	15-64740 15 days ago	0-1093 18 minutes
31057	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): `reindex` lemmas	Add lemmas about all the incenter/excenter-related definitions applied to a reindexed simplex. --- - [ ] depends on: #31054 - [ ] depends on: #31055 - [ ] depends on: #31056 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	106/1	Mathlib/Geometry/Euclidean/Altitude.lean,Mathlib/Geometry/Euclidean/Incenter.lean,Mathlib/Geometry/Euclidean/Projection.lean,Mathlib/LinearAlgebra/AffineSpace/Simplex/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-61670 15 days ago	15-64741 15 days ago	0-617 10 minutes
30342	joelriou author:joelriou	feat(Algebra/Category/ModuleCat/Sheaf): compatibilities of pushforward and pullbacks on sheaves of modules	--- - [x] depends on: #30335 - [ ] depends on: #30318 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	265/19	Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean,Mathlib/CategoryTheory/Sites/Continuous.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-50292 15 days ago	15-50322 15 days ago	0-312 5 minutes
30482	vihdzp author:vihdzp	feat: colex order on (dependent) finsupps	--- - [x] depends on: #30481 - [x] depends on: #30483 - [x] depends on: #30510 - [ ] depends on: #30973 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	129/17	Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Order/PiLex.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-44198 15 days ago	16-62553 16 days ago	0-5166 1 hour
29996	vihdzp author:vihdzp	chore(Order/Concept): `IsIntent` and `IsExtent`	We define predicates for a set to be an intent/extent, and use them to define alternate constructors for a concept. Using these, we golf the complete lattice instances. --- - [ ] depends on: #30484 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	240/116	Mathlib/Order/Concept.lean,Mathlib/Order/Lattice.lean	2	23	['Vierkantor', 'github-actions', 'linesthatinterlace', 'mathlib4-dependent-issues-bot', 'plp127', 'vihdzp']	Vierkantor assignee:Vierkantor	15-42628 15 days ago	32-22963 1 month ago	16-59311 16 days
29942	smmercuri author:smmercuri	feat(InfinitePlace/Completion): embeddings of `w.Completion` factor through embeddings of `v.Completion` when `w` extends `v`	If `w : v.Extension L` is an extension of `v : InfinitePlace K` to `L`, then `extensionEmbedding w : L →+* ℂ` factors through `extensionEmbedding v : K →+* ℂ`. --- - [x] depends on: #27978 - [ ] depends on: #29969 - [x] depends on: #29944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT merge-conflict blocked-by-other-PR	207/60	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/MetricSpace/Completion.lean	5	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-39460 15 days ago	15-56910 15 days ago	0-1122 18 minutes
30551	smmercuri author:smmercuri	feat: dimension formulae for infinite places above	--- - [x] depends on: #27978 - [x] depends on: #27974 - [ ] depends on: #29942 - [ ] depends on: #29946 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	611/6	Mathlib.lean,Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Dimension.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Embeddings.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-39413 15 days ago	15-40744 15 days ago	0-10 10 seconds
30350	joelriou author:joelriou	feat(AlgebraicGeometry): the pseudofunctor which sends a scheme to its category of sheaves of modules	We define `Scheme.Modules.pseudofunctor : Pseudofunctor (LocallyDiscrete Schemeᵒᵖ) (Adj Cat)` which sends a scheme `X` to the category `X.Modules` of sheaves of modules (not to be be confused with the full subcategory of quasi-coherent sheaves). The target bicategory is the bicategory of adjunctions in the bicategory of categories: this means that we formalise both the pushforward and the pullback of sheaves of modules over schemes. --- - [x] depends on: #30335 - [ ] depends on: #30318 - [ ] depends on: #30342 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebraic-geometry blocked-by-other-PR	569/34	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Abelian.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PullbackContinuous.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/PushforwardContinuous.lean,Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/CategoryTheory/Adjunction/CompositionIso.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Cat.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Sites/Continuous.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-78107 14 days ago	14-78483 14 days ago	0-1172 19 minutes
31076	mcdoll author:mcdoll	feat(Analysis/InnerProductSpace): extension to linear isometry equivalence	--- - [x] depends on: #29888 - [ ] depends on: #31074 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	37/0	Mathlib/Analysis/InnerProductSpace/Extend.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-70894 14 days ago	15-24661 15 days ago	0-1973 32 minutes
29948	mcdoll author:mcdoll	feat(Analysis/Fourier): the Fourier transform on L^2	--- - [x] depends on: #29888 - [x] depends on: #29860 - [ ] depends on: #31074 - [ ] depends on: #31076 - [ ] depends on: #31079 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	505/92	Mathlib.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Fourier/L2Space.lean,Mathlib/Analysis/InnerProductSpace/Extend.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-67036 14 days ago	14-68743 14 days ago	0-2667 44 minutes
30352	kckennylau author:kckennylau	(WIP) 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. - [ ] depends on: #30173 - [ ] depends on: #30322 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR WIP	563/48	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/TensorLocalization.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean	13	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-61336 14 days ago	14-61337 14 days ago	0-9 9 seconds
31078	AntoineChambert-Loir author:AntoineChambert-Loir	feat:(LinearAlgebra/SpecialLinearGroup) : center of the special linear group of a module	prove that the center special linear group of a module consists with roots of unity compare with the corresponding result `Matrix.SpecialLinearGroup.center_equiv_rootsOfUnity`. --- - [ ] depends on: #30987 [![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$	765/14	Mathlib.lean,Mathlib/LinearAlgebra/Charpoly/BaseChange.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Dual.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean	10	39	['AntoineChambert-Loir', 'Ruben-VandeVelde', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-49589 14 days ago	14-52416 14 days ago	0-12 12 seconds
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/)	t-algebra blocked-by-other-PR WIP label:t-algebra$	192/3	Mathlib.lean,Mathlib/Geometry/Group/Marking.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	4	14	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-42487 14 days ago	14-42509 14 days ago	22-16818 22 days
31108	grunweg author:grunweg	Immersions nochoice	--- - [ ] depends on: #30356 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	550/0	Mathlib.lean,Mathlib/Geometry/Manifold/IsImmersionEmbedding.lean,Mathlib/Geometry/Manifold/LocalSourceTargetProperty.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	14-26166 14 days ago	14-26167 14 days ago	0-1 1 second
30811	yonggyuchoimath author:yonggyuchoimath	feat(AlgebraicGeometry.EffectiveEpi): effective epimorphisms in schemes	We prove the following: * `AffineScheme.effectiveEpiOfFlatOfSurjective`: A flat surjective morphism (between affine schemes) is an effective epimorphism in the category of affine schemes. * `descSpecOfFlatOfSurjective`: Given a morphism `e : Spec S ⟶ U` of schemes which coequalizes the two projections `(Spec S) ×[Spec R] (Spec S) ⟶ Spec S`, this constructs a unique morphism `Spec R ⟶ U` of schemes that `e` factors through. * `effectiveEpi_Spec_of_flat_of_surjective`: If `f : R ⟶ S` is a flat ring map in `CommRingCat` with surjective `Spec.map f : Spec S ⟶ Spec R`, then `Spec.map f : Spec S ⟶ Spec R` is an effective epimorphism in the category of schemes. --- - [x] depends on: #30237 - [ ] depends on: #30204 Note: I've again incorporated `Scheme.isAffine_local_affine`, an instance saying that any `Scheme.local_affine` at a point gives an affine scheme, in order to define `coverR` in line 259. As already noted in [this review](https://github.com/leanprover-community/mathlib4/pull/30034#pullrequestreview-3277376677) of #30034, having `Scheme.local_affine` in statements is not desirable as any such statements should be true for any open affine neightborhoods. In fact, it is possible to define `coverR` (and prove the rest) without invoking this instance, e.g., using [`exists_isAffineOpen_mem_and_subset`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/AlgebraicGeometry/AffineScheme.html#AlgebraicGeometry.exists_isAffineOpen_mem_and_subset). A problem of this approach is that `IsAffine` is not automatically synthesized (even if I add an `IsAffine` instance for `exists_isAffineOpen_mem_and_subset`) because `hxU : x ∈ U` can't be synthesized automatically, and this forced to explicitly write down the proof of `IsAffine` everytime. That's the reason that I included `Scheme.isAffine_local_affine` in this PR. I would appreciate any suggestions on this. Another note: I've marked many definitions and lemmas with `private`. My criterion was the following: - It is not optimal as it is stated and can be enhanced after proving `effectiveEpi_Spec_of_flat_of_surjective`: `base_factorization` in line 102 (as it should be true for quasi-compact coverings that are flat surjective). - The definition/lemma seems specific to the proof of `descSpecOfFlatOfSurjective`. Even when proving fpqc morphisms of algebraic spaces are effective epimorphisms, we would only need `descSpecOfFlatOfSurjective` and lemmas about it (but not the things like `e'_coeq_pullback_f'` or `desc'_cocycle_condition`), cf. [Stacks project, Tag 04P2](https://stacks.math.columbia.edu/tag/04P2).	merge-conflict blocked-by-other-PR	780/1	Mathlib.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/EffectiveEpi.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	13-72953 13 days ago	13-72954 13 days ago	0-2336 38 minutes
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`. --- - [ ] depends on: #31132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	293/0	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Saturation.lean,Mathlib/RingTheory/Localization/Saturation.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-27689 13 days ago	13-27690 13 days ago	0-169 2 minutes
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. --- - [ ] depends on: #31077 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	353/9	Mathlib/Analysis/Calculus/ParametricIntegral.lean,Mathlib/Analysis/Calculus/ParametricIntervalIntegral.lean,Mathlib/MeasureTheory/Integral/DominatedConvergence.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/Defs/Filter.lean,Mathlib/Topology/NhdsWithin.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-5311 13 days ago	13-5312 13 days ago	0-2786 46 minutes
29309	LLaurance author:LLaurance	feat(Combinatorics): any connected graph contains a vertex that leaves the graph preconnected if removed	This shows that any nontrivial connected graph contains a vertex that, when removed, leaves the graph connected. --- - [x] depends on: #30590 - [ ] depends on: #31103 - [x] depends on: #31116 - [ ] depends on : #31118 - [ ] depends on : #31119 - [ ] depends on : #31120 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics awaiting-author blocked-by-other-PR	182/2	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean	4	56	['LLaurance', 'SnirBroshi', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	YaelDillies assignee:YaelDillies	12-74793 12 days ago	12-79981 12 days ago	32-22015 32 days
31152	FernandoChu author:FernandoChu	feat(CategoryTheory): regular categories have strong-epi-mono factorisations	This PR defines regular categories and shows that these have strong-epi-mono factorisations. A follow up PR will prove frobenius reciprocity. - [ ] depends on: https://github.com/leanprover-community/mathlib4/pull/31145 --- This is a prerequisite of the [MTT project](https://github.com/kyoDralliam/model-theory-topos), which aims to use the internal language of toposes to reason about e.g. sheaves.	large-import t-category-theory blocked-by-other-PR	364/68	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Images.lean,Mathlib/CategoryTheory/Limits/Shapes/KernelPair.lean,Mathlib/CategoryTheory/Limits/Shapes/RegularMono.lean,Mathlib/CategoryTheory/Limits/Shapes/StrongEpi.lean,Mathlib/CategoryTheory/RegularCategory/Basic.lean,docs/references.bib	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-83706 11 days ago	12-54963 12 days ago	0-3327 55 minutes
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 --- - [ ] depends on: #26368 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	423/0	Mathlib.lean,Mathlib/RingTheory/SimpleRing/TensorProduct.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	3	15	['Whysoserioushah', 'eric-wieser', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	11-54529 11 days ago	100-64249 3 months ago	0-2337 38 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 (to be cleaned up!) - 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 (still WIP) - [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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	5111/269	Mathlib.lean,Mathlib/Geometry/Manifold/CheatSheet.md,Mathlib/Geometry/Manifold/PartitionOfUnity.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/LeviCivita.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	17	n/a	['github-actions', 'grunweg', 'idontgetoutmuch', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	11-49104 11 days ago	unknown	unknown
31205	jsm28 author:jsm28	feat(Analysis/Convex/Side): affine combinations and sides of faces of a simplex	Add lemmas saying when (in terms of the weights in the combinations) two affine combinations of the vertices of a simplex lie (strictly or weakly) on the same or opposite sides of a face of that simplex opposite a vertex. --- - [ ] depends on: #31204 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry blocked-by-other-PR	235/0	Mathlib/Analysis/Convex/Side.lean,Mathlib/LinearAlgebra/AffineSpace/Combination.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-29761 11 days ago	11-29762 11 days ago	0-744 12 minutes
30871	urkud author:urkud	feat(DifferentialForm): pullback commutes with exterior derivative	--- - [ ] depends on: #30331 - [x] depends on: #30182 - [x] depends on: #30491 - [x] depends on: #30018 - [x] depends on: #29985 - [x] depends on: #29984 - [x] depends on: #29957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	614/24	Mathlib.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Calculus/DifferentialForm/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousMultilinearMap.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Analysis/NormedSpace/Alternating/Uncurry/Fin.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Alternating/Uncurry/Fin.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	11-27459 11 days ago	11-36347 11 days ago	0-769 12 minutes
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 merge-conflict blocked-by-other-PR	770/4	Mathlib.lean,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	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-53529 10 days ago	10-53530 10 days ago	0-1197 19 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 - [ ] depends on: #26614 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	825/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/GirthDiam.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-83935 9 days ago	9-83936 9 days ago	0-28 28 seconds
25273	YaelDillies author:YaelDillies	refactor: make `MonoidAlgebra` into a one-field structure	From Toric --- - [x] depends on: #26732 - [x] depends on: #28407 - [x] depends on: #28460 - [x] depends on: #29207 - [ ] depends on: #30877 - [ ] depends on: #31143 - [ ] depends on: #31144 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	652/473	Mathlib/Algebra/Group/Action/TransferInstance.lean,Mathlib/Algebra/Module/TransferInstance.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/MonoidAlgebra/Division.lean,Mathlib/Algebra/MonoidAlgebra/Ideal.lean,Mathlib/Algebra/MonoidAlgebra/Lift.lean,Mathlib/Algebra/MonoidAlgebra/MapDomain.lean	7	39	['JovanGerb', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-79055 9 days ago	18-60282 18 days ago	36-61320 36 days
30927	callesonne author:callesonne	feat(Bicategory/Yoneda): add the yoneda pseudofunctor	--- - [ ] depends on: #30926 - [ ] depends on: #30895 - [ ] depends on: #25901 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	759/91	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Opposites.lean,Mathlib/CategoryTheory/Bicategory/Yoneda.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/Data/Opposite.lean	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-62810 9 days ago	unknown	unknown
31169	callesonne author:callesonne	feat(Bicategory/Product): add products of bicategories	--- - [x] depends on: #31160 - [ ] depends on: #30132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	273/2	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Bicategory/Functor/StrictlyUnitary.lean,Mathlib/CategoryTheory/Bicategory/Product.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-58887 9 days ago	9-58888 9 days ago	0-3065 51 minutes
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/)	large-import blocked-by-other-PR	227/199	Mathlib.lean,Mathlib/Lean/Linter.lean,Mathlib/Tactic/Linter/CommandRanges.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Tactic/Linter/DeprecatedModule.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/ToAdditive/Frontend.lean,Mathlib/Util/CountHeartbeats.lean,scripts/lint-style.lean	21	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-45236 9 days ago	13-22915 13 days ago	0-0 0 seconds
30736	alreadydone author:alreadydone	feat(RingTheory): Picard group of a domain is isomorphic to ClassGroup	--- - [ ] depends on: #30657 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	411/115	Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Data/Set/Semiring.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/FractionalIdeal/Basic.lean,Mathlib/RingTheory/FractionalIdeal/Operations.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/PicardGroup.lean,docs/references.bib	10	5	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-28418 9 days ago	9-57637 9 days ago	0-1 1 second
29393	staroperator author:staroperator	feat(SetTheory/ZFC): `card (V_ o) = preBeth o`	--- - [ ] depends on: #26544 - [x] depends on: #29351 - [ ] depends on: #29365 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	231/41	Mathlib.lean,Mathlib/Data/W/Cardinal.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/Ordinal.lean,Mathlib/SetTheory/Cardinal/Pigeonhole.lean,Mathlib/SetTheory/Cardinal/Regular.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Cardinal.lean,Mathlib/SetTheory/ZFC/VonNeumann.lean	14	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	nobody	9-22969 9 days ago	22-35320 22 days ago	0-0 0 seconds
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	large-import t-measure-probability merge-conflict blocked-by-other-PR	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	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-20577 9 days ago	unknown	unknown
29365	staroperator author:staroperator	feat(SetTheory/ZFC): add `ZFSet.card`	The same as `ZFSet.rank`, we define `ZFSet.card` as `ZFSet.{u} → Cardinal.{u}` and prove some basic properties. --- - [x] depends on: #30841 - [ ] depends on: #31287 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory blocked-by-other-PR	197/83	Mathlib.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Cardinal.lean	4	48	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator', 'vihdzp']	YaelDillies assignee:YaelDillies	8-54531 8 days ago	8-54532 8 days ago	48-85122 48 days
31162	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Dual/BaseChange): base change of a linear form (on the Module.Dual)	Base change map for `Module.Dual`. --- - [ ] depends on: #31240 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	607/6	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/BaseChange.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-54428 8 days ago	9-80757 9 days ago	2-19540 2 days
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/)	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-53780 8 days ago	77-46481 2 months ago	65-54988 65 days
30190	joelriou author:joelriou	feat(CategoryTheory/Sites): functoriality of descent data	Given a pseudofunctor `F` from `LocallyDiscrete Cᵒᵖ` to `Cat`, we show that up to an equivalence, the category `F.DescentData f` is unchanged when we replace `S` by an isomorphic object, or the family `f i : X i ⟶ S` by another family which generates the same sieve (see `Pseudofunctor.pullFunctorEquivalence`). Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [x] depends on: #25971 - [x] depends on: #30177 - [ ] depends on: #30189 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	399/3	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-41081 8 days ago	8-53578 8 days ago	0-2 2 seconds
30926	callesonne author:callesonne	feat(Bicategory/Functorbicategory): define bicategory of pseudofunctors	This PR contains a definition of the bicategory of pseudofunctors, in the file `Bicategory/FunctorBicategory/Pseudo.lean`. It also moves the file `Bicategory/Functorbicategory.lean` to `Bicategory/FunctorBicategory/Oplax.lean`. This is a migration of #14089 to a fork. --- - [ ] depends on: #30895 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	428/63	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-38796 8 days ago	8-38797 8 days ago	0-1216 20 minutes
31079	mcdoll author:mcdoll	feat(Analysis/ContDiff): smooth compactly supported functions are dense in Lp	--- - [ ] depends on: #31278 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	152/2	Mathlib.lean,Mathlib/Analysis/Calculus/BumpFunction/SmoothApproxLp.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,scripts/noshake.json	4	14	['ADedecker', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mcdoll']	nobody	7-70848 7 days ago	7-70849 7 days ago	7-25995 7 days
26391	grunweg author:grunweg	feat: immersed submanifolds	Still under construction --- - [ ] depends on: #26087 - [ ] depends on: #23040 Better version of #24549. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR WIP	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	7-37518 7 days ago	7-37519 7 days ago	0-0 0 seconds
30339	grunweg author:grunweg	feat: extend a tangent vector for a locally smooth vector field	Given a vector bundle `V` over `M` and a vector `X` in the fibre `E x` some point `x`, construct a section of `V` which is smooth near `x` and has value `X` at `x`. This will be used to prove the tensoriality of covariant derivatives. From the path towards geodesics and the Levi-Civita connection. Co-authored-by: Patrick Massot [patrickmassot@free.fr](mailto:patrickmassot@free.fr) --- TODO: order of variables --- first e then b, or the other way around? should the new definition be namespaced, e.g. in the Trivialization namespace? - [ ] depends on: #30083 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	435/14	Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-25527 7 days ago	21-36773 21 days ago	0-850 14 minutes
31339	grunweg author:grunweg	Movelemma	--- - [ ] depends on: #31338 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	415/78	Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Constructions.lean,Mathlib/Topology/VectorBundle/Hom.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-21263 7 days ago	7-21263 7 days ago	0-1962 32 minutes
31338	grunweg author:grunweg	chore: move Pretrivialization, Trivialization to the Bundle namespace	As suggested in #30083. --- - [ ] depends on: #30083 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	400/71	Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Constructions.lean,Mathlib/Topology/VectorBundle/Hom.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-21261 7 days ago	7-21262 7 days ago	0-2491 41 minutes
30886	urkud author:urkud	feat(DifferentialForm): exterior derivative applied to vector fields	--- - [ ] depends on: #30331 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	685/20	Mathlib.lean,Mathlib/Analysis/Asymptotics/TVS.lean,Mathlib/Analysis/Calculus/DifferentialForm/VectorField.lean,Mathlib/Analysis/Calculus/FDeriv/ContinuousAlternatingMap.lean,Mathlib/Analysis/Convex/EGauge.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Analysis/NormedSpace/Alternating/Uncurry/Fin.lean,Mathlib/LinearAlgebra/Alternating/Uncurry/Fin.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	7-9921 7 days ago	7-11335 7 days ago	0-0 0 seconds
26884	alreadydone author:alreadydone	Universal cover	--- - [ ] depends on: #24983 - [ ] depends on: #22771 - [ ] depends on: #22782 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict blocked-by-other-PR WIP	1126/359	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/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	20	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	6-54459 6 days ago	127-51384 4 months ago	0-0 0 seconds
30640	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): a maximally acyclic graph is a tree	Prove that a graph is maximally acyclic iff it is a tree, plus helpful theorems about bridges and acyclicity. --- - [ ] depends on: #30570 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	118/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	6-47029 6 days ago	6-47051 6 days ago	0-627 10 minutes
30189	joelriou author:joelriou	feat(CategoryTheory/Sites): descent data	In this file, given a pseudofunctor `F` from `LocallyDiscrete Cᵒᵖ` to `Cat`, and a family of maps `f i : X i ⟶ S` in the category `C`, we define the category `F.DescentData f` of objects over the `X i` equipped with a descent data relative to the morphisms `f i : X i ⟶ S`. Co-authored-by: Christian Merten [christian@merten.dev](mailto:christian@merten.dev) --- - [x] depends on: #25971 - [x] depends on: #30177 - [ ] depends on: #31051 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	157/3	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat.lean,Mathlib/CategoryTheory/Bicategory/LocallyDiscrete.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/CategoryTheory/Sites/Descent/DescentData.lean	5	7	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	6-40852 6 days ago	9-50536 9 days ago	0-1 1 second
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`. --- - [ ] depends on: #25843 - [x] depends on: #27597 - [ ] depends on: #27599 - [x] depends on: #28443 - [x] depends on: #28445 - [x] depends on: #28446 - [x] depends on: #28447 Similar to #25841 I've tried to make as much of the double-counting construction not private as possible. I figure it is useful to borrow constructions between proofs. If this is just considered garbage and bloat and better left private. Please let me know. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict blocked-by-other-PR WIP	582/14	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	5-80652 5 days ago	77-61507 2 months ago	0-46 46 seconds
25841	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): prove the Kővári–Sós–Turán theorem	Prove the Kővári–Sós–Turán theorem for simple graphs: The `(completeBipartiteGraph α β).Free` simple graphs for `card α ≤ card β` on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2 + (card V)(card α-1)/2` edges. The double-counting construction from the proof is available in `namespace KovariSosTuran`. --- - [x] depends on: #19865 - [x] depends on: #20738 - [ ] depends on: #27602 I've tried to make as much of the double-counting construction not private as possible. I figure it is useful to borrow constructions between proofs. If this is just considered garbage and bloat and better left private. Please let me know. [![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 merge-conflict blocked-by-other-PR WIP	283/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Bipartite.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean	3	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-79479 5 days ago	5-79480 5 days ago	45-15427 45 days
26184	vasnesterov author:vasnesterov	feat(Topology): every compact metric space is image of Cantor set	Prove `exists_nat_bool_continuous_surjective_of_compact`: for every nonempty compact metric space X there is a continuous surjection from the Cantor space to X. This is known as Hausdorff–Alexandroff theorem. --- - [ ] depends on: #26027 - [ ] depends on: #26149 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology merge-conflict blocked-by-other-PR	869/0	Mathlib.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Nat/Cast/Order/Field.lean,Mathlib/Data/Real/OfDigits.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Instances/CantorSet.lean,Mathlib/Topology/MetricSpace/HausdorffAlexandroff.lean,scripts/noshake.json	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-68450 5 days ago	132-7710 4 months ago	0-602 10 minutes
31018	joelriou author:joelriou	feat(CategoryTheory): the κ-accessible category of κ-directed posets	WIP --- - [ ] depends on: #29519 - [ ] depends on: #29543 - [ ] depends on: #29565 - [ ] depends on: #29854 - [ ] depends on: #30459 - [ ] depends on: #30605 - [ ] depends on: #30633 - [ ] depends on: #30634 - [ ] depends on: #30693 - [ ] depends on: #30696 - [ ] depends on: #30781 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory merge-conflict blocked-by-other-PR WIP	2166/112	Mathlib.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/Small.lean,Mathlib/CategoryTheory/Filtered/Final.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/MorphismProperty/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/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalDirectedPoset.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Directed.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/Order/Category/PartOrdEmb.lean,Mathlib/SetTheory/Cardinal/HasCardinalLT.lean,Mathlib/SetTheory/Cardinal/Regular.lean,docs/references.bib	26	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-52805 5 days ago	unknown	unknown
30089	loefflerd author:loefflerd	feat(NumberTheory/ModularForms): Bounds on modular forms and q-expansion coeffs	Show that the q-expansion coefficients of a weight k modular form grow like `n ^ k`, and like `n ^ (k / 2)` for cusp forms. --- This is a "blockbuster" PR from which many smaller chunks will be carved off for review and submission. The first in the series are the following: - [x] depends on: #29743 - [x] depends on: #30475 - [x] depends on: #30461 - [ ] depends on: #30471 - [ ] depends on: #30512 - [ ] depends on: #30648 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory blocked-by-other-PR WIP	943/94	Mathlib.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean,Mathlib/Topology/Algebra/Order/ArchimedeanDiscrete.lean	10	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-49854 5 days ago	unknown	unknown
27433	YaelDillies author:YaelDillies	refactor: make `⇑e⁻¹ = ⇑e.symm` simp	The motivation here is that the spelling `⇑e⁻¹` is only available when `e` is an automorphism, while the `⇑e.symm` one is available for all isomorphisms. However we do not want to simplify `e⁻¹ = e.symm` (without the coercions to function) since `e⁻¹` is an algebraic expression and `e.symm` is not. We consider that applying the coercion to functions gets us out of algebra land, and therefore it is okay to "dealgebraise" the expression further. From BrauerGroup and ClassFieldTheory --- - [x] depends on: #31129 - [x] depends on: #31130 - [ ] depends on: #31389 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CFT blocked-by-other-PR	202/257	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Data/Fintype/Perm.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/GroupTheory/Perm/Basic.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean	15	13	['YaelDillies', 'dwrensha', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dwrensha assignee:dwrensha	5-39442 5 days ago	5-39443 5 days ago	76-25833 76 days
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. --- - [ ] 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/)	large-import t-category-theory blocked-by-other-PR WIP	556/2	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/IsSmall.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsCardinalClosure.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Limits.lean,Mathlib/CategoryTheory/ObjectProperty/FunctorCategory/Presheaf.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/Presentable/Continuous.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean	10	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-37562 5 days ago	5-37588 5 days ago	0-1 1 second
30464	joelriou author:joelriou	feat(CategoryTheory): κ-presentable objects in a κ-accessible category is an essentially small category	We show that if `P : ObjectProperty C` satisfies `P.IsCardinalFilteredGenerator κ`, then `isCardinalPresentable C κ = P.retractClosure`. As we also show that the closure under retracts of an essentially small `ObjectProperty` (in a locally small category) is essentially small, we deduce that in a `κ`-accessible (or locally `κ`-presentable) category, the full subcategory of `κ`-presentable objects is an essentially small subcategory. --- - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29854 - [x] depends on: #29881 - [x] depends on: #29903 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	383/83	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	7	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-37401 5 days ago	5-37439 5 days ago	0-1 1 second
30755	joelriou author:joelriou	feat(CategoryTheory): presentable objects form a dense subcategory	In a `κ`-accessible category `C`, `isCardinalPresentable C κ` is a dense subcategory. WIP --- - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [ ] depends on: #30269 - [x] depends on: #29556 - [ ] depends on: #29519 - [ ] depends on: #29543 - [ ] depends on: #29854 - [ ] depends on: #29881 - [x] depends on: #29903 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	1829/548	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/AB.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Generator.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/EnoughInjectives.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Adjunction/AdjointFunctorTheorems.lean,Mathlib/CategoryTheory/Comma/StructuredArrow/Small.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Generator/HomologicalComplex.lean,Mathlib/CategoryTheory/Generator/Indization.lean,Mathlib/CategoryTheory/Generator/Preadditive.lean,Mathlib/CategoryTheory/Generator/Presheaf.lean,Mathlib/CategoryTheory/Generator/Sheaf.lean,Mathlib/CategoryTheory/Generator/StrongGenerator.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/Equalizers.lean,Mathlib/CategoryTheory/Limits/MorphismProperty.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/ClosedUnderIsomorphisms.lean,Mathlib/CategoryTheory/ObjectProperty/ColimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/CompleteLattice.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsClosure.lean,Mathlib/CategoryTheory/ObjectProperty/LimitsOfShape.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Dense.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean	33	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-37063 5 days ago	unknown	unknown
31137	joelriou author:joelriou	feat(CategoryTheory): an accessible category is essentially large	If a category `C` satisfies `HasCardinalFilteredGenerator C κ` for `κ : Cardinal.{w}` (e.g. it is locally `κ`-presentable or `κ`-accessible), then `C` is equivalent to a `w`-large category, i.e. a category whose type of objects is in `Type (w + 1)` and whose types of morphisms are in `Type w`. --- - [ ] depends on: #30755 - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #29543 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	672/88	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/ObjectProperty/Equivalence.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Dense.lean,Mathlib/CategoryTheory/Presentable/EssentiallyLarge.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-36875 5 days ago	5-36905 5 days ago	0-1 1 second
30533	joelriou author:joelriou	feat(CategoryTheory): presentable objects and adjunctions	If `adj : F ⊣ G` and `G` is `κ`-accessible for a regular cardinal `κ`, then `F` preserves `κ`-presentable objects. Moreover, if `G : D ⥤ C` is fully faithful, then `D` is locally `κ`-presentable (resp `κ`-accessible) if `D` is. --- - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29854 - [x] depends on: #29881 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	576/88	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/ReflectiveLimits.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Adjunction.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	11	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-36497 5 days ago	5-36520 5 days ago	0-1 1 second
30731	joelriou author:joelriou	feat(CategoryTheory/Presentable): transport via an equivalence	If `e : C ≌ D` is an equivalence of categories and `C` is locally presentable (resp. accessible), then so is `D`. --- - [ ] depends on: #30533 - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29854 - [x] depends on: #29881 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	616/88	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/ReflectiveLimits.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Adjunction.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	11	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-36453 5 days ago	5-36478 5 days ago	0-2 2 seconds
30507	joelriou author:joelriou	feat(CategoryTheory): MorphismProperty.isLocal is closed under `κ`-filtered colimits	... when the domains and codomains of the `MorphismProperty` are `κ`-presentable. (We also show that it is always closed under all limits.) --- - [x] depends on: #29881 - [x] depends on: #30492 - [x] depends on: #30472 - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [ ] depends on: #29543 - [x] depends on: #29854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	432/85	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/OrthogonalReflection.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	10	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-36148 5 days ago	5-36168 5 days ago	0-1 1 second
30459	joelriou author:joelriou	refactor(CategoryTheory/Presentable): cleaning up HasCardinalFilteredGenerator(s)	We move `IsCardinalFilteredGenerator(s)` to the `ObjectProperty` namespace. Instead of using an index type in `Type w` for parametrising a family of objects, we use `ObjectProperty` and express the (essential) smallness using the typeclass `ObjectProperty.(Essentially)Small`. --- - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29854 - [x] depends on: #29881 - [x] depends on: #29903 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	241/79	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean	5	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-36055 5 days ago	5-37503 5 days ago	0-1 1 second
30241	joelriou author:joelriou	feat(CategoryTheory): locally presentable categories and strong generators	Let `C` be category that is locally `w`-small and has colimits of shape `w`. Then, `C` is locally `κ`-presentable iff it has a strong generator consisting of `κ`-presentable objects. (This is a draft.) --- - [ ] depends on: #30459 - [ ] depends on: #30168 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29851 - [x] depends on: #29881 - [x] depends on: #29903 - [x] depends on: #29854 - [x] depends on: #30160 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29518 - [x] depends on: #29543 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	774/87	Mathlib.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Limits/HasLimits.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/Small.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/StrongGenerator.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean	18	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-35612 5 days ago	5-35636 5 days ago	0-1 1 second
30513	joelriou author:joelriou	feat(CategoryTheory): orthogonal-reflection construction: existence of the left adjoint	(WIP: For now, after some mistake managing the PRs, this is a duplicate of #30507, but some more code will be added later by splitting #30554.) --- - [x] depends on: #30509 - [ ] depends on: #30507 - [x] depends on: #29881 - [x] depends on: #30492 - [x] depends on: #30472 - [ ] depends on: #30464 - [ ] depends on: #30459 - [ ] depends on: #29565 - [x] depends on: #30269 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29854 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	432/85	Mathlib.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/OrthogonalReflection.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean	10	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-35037 5 days ago	5-36092 5 days ago	0-1 1 second
30554	joelriou author:joelriou	feat(CategoryTheory): localization of locally presentable categories	Let `W : MorphismProperty C` be a `w`-small property of morphisms in a locally `κ`-presentable category `C` (with `κ : Cardinal.{w}` a regular cardinal), such that the domains and codomains of morphisms satisfying `W` are `κ`-presentable. Then, the fullsubcategory `W.rightOrthogonal` is also locally `κ`-presentable (it is also stable under `κ`-filtered colimits, and the inclusion functor has a left adjoint). --- - [x] depends on: #29519 - [x] depends on: #29543 - [x] depends on: #29556 - [ ] depends on: #29565 - [x] depends on: #29854 - [x] depends on: #29881 - [x] depends on: #30269 - [ ] depends on: #30459 - [ ] depends on: #30464 - [x] depends on: #30472 - [x] depends on: #30492 - [ ] depends on: #30507 - [x] depends on: #30509 - [ ] depends on: #30513 - [ ] depends on: #30533 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	870/103	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/ReflectiveLimits.lean,Mathlib/CategoryTheory/Functor/KanExtension/Dense.lean,Mathlib/CategoryTheory/Limits/Presentation.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/ObjectProperty/Local.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Adjunction.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/OrthogonalReflection.lean,Mathlib/CategoryTheory/Presentable/Retracts.lean,Mathlib/CategoryTheory/Yoneda.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-34511 5 days ago	unknown	unknown
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: #31137 - [ ] depends on: #30817 - [ ] depends on: #30755 - [ ] depends on: #30731 - [ ] depends on: #30554 - [ ] depends on: #30533 - [ ] depends on: #30513 - [x] depends on: #30509 - [ ] depends on: #30507 - [x] depends on: #30492 - [ ] depends on: #30464 - [ ] depends on: #30459 - [x] depends on: #30269 - [ ] depends on: #30247 - [ ] depends on: #30241 - [ ] depends on: #30168 - [x] depends on: #30160 - [x] depends on: #29881 - [x] depends on: #29854 - [ ] 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/)	large-import t-category-theory blocked-by-other-PR WIP	2735/111	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Basic.lean,Mathlib/CategoryTheory/Adjunction/ReflectiveLimits.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/Presentation.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/Local.lean,Mathlib/CategoryTheory/ObjectProperty/Retract.lean,Mathlib/CategoryTheory/ObjectProperty/Small.lean,Mathlib/CategoryTheory/Presentable/Adjunction.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Continuous.lean,Mathlib/CategoryTheory/Presentable/Dense.lean,Mathlib/CategoryTheory/Presentable/EssentiallyLarge.lean,Mathlib/CategoryTheory/Presentable/IsCardinalFiltered.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/Retracts.lean,Mathlib/CategoryTheory/Presentable/StrongGenerator.lean,Mathlib/CategoryTheory/Presentable/Type.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean,Mathlib/CategoryTheory/Yoneda.lean	41	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-33297 5 days ago	unknown	unknown
30247	joelriou author:joelriou	feat(CategoryTheory): categories of presheaves are locally presentable	If `C` is a `w`-small category and `A` is locally `κ`-presentable, then the category `Cᵒᵖ ⥤ Type w` is locally `κ`-presentable; in particular, the category of presheaves of types on a small category is locally (finitely) presentable. (Currently, we formalise this under the additional assumption that `A` has pullbacks. This assumption shall be removed in the future as a locally presentable category is complete.) --- - [ ] depends on: #30459 - [ ] depends on: #30241 - [ ] depends on: #30168 - [x] depends on: #29851 - [x] depends on: #29881 - [x] depends on: #29903 - [x] depends on: #29854 - [x] depends on: #30160 - [ ] depends on: #29565 - [x] depends on: #29556 - [x] depends on: #29519 - [x] depends on: #29518 - [x] depends on: #29543 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	945/87	Mathlib.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/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/Small.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/Limits.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/CategoryTheory/Presentable/Presheaf.lean,Mathlib/CategoryTheory/Presentable/StrongGenerator.lean,Mathlib/CategoryTheory/Presentable/Type.lean,Mathlib/CategoryTheory/SmallRepresentatives.lean	21	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	5-30561 5 days ago	5-30561 5 days ago	0-46 46 seconds
31083	joelriou author:joelriou	feat(CategoryTheory): properties of objects for pseudofunctors to Cat	Given `F : Pseudofunctor B Cat`, we introduce a type `F.ObjectProperty` which consists of properties `P` of objects for all categories `F.obj X` for `X : B`. The typeclass `P.IsClosedUnderMapObj` expresses that this property is preserved by the application of the functors `F.map`: this allows to define a sub-pseudofunctor `P.fullsubcategory : Pseudofunctor B Cat`. --- - [ ] depends on: #26446. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	140/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Cat/ObjectProperty.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-26684 5 days ago	14-63503 14 days ago	0-1 1 second
27378	peakpoint author:peakpoint	refactor(Geometry/Euclidean/Projection): redefine projection and reflection for affine subspaces	This PR continues the work from #25578. Original PR: https://github.com/leanprover-community/mathlib4/pull/25578 - [ ] depends on: #31395	new-contributor t-euclidean-geometry blocked-by-other-PR	316/321	Mathlib/Analysis/Normed/Affine/Isometry.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Projection.lean	3	9	['github-actions', 'jsm28', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peakpoint']	nobody	5-16456 5 days ago	5-35767 5 days ago	15-31228 15 days
29777	yuanyi-350 author:yuanyi-350	feat(Functional Analysis) : Closed Range Theorem	- [ ] depends on: #29151 [Corollary of Hahn-Banach theorem] - [x] 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/)	large-import new-contributor t-analysis awaiting-author blocked-by-other-PR WIP	238/27	Mathlib.lean,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	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	faenuccio assignee:faenuccio	5-15432 5 days ago	6-26219 6 days ago	0-634 10 minutes
27953	CoolRmal author:CoolRmal	feat(ProbabilityTheory): Conditional Jensen's Inequality	This PR adds conditional Jensen's inequality. --- - [ ] depends on: #31180 - [ ] depends on: #31411 - [ ] depends on: #31399 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability blocked-by-other-PR	462/10	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean	5	7	['CoolRmal', 'EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	sgouezel assignee:sgouezel	4-78726 4 days ago	4-78726 4 days ago	27-80190 27 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). --- - [ ] depends on: #30089	large-import t-number-theory blocked-by-other-PR WIP	1081/125	Mathlib.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/FunctionsBoundedAtInfty.lean,Mathlib/NumberTheory/LSeries/AbstractFuncEq.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/NumberTheory/ModularForms/Basic.lean,Mathlib/NumberTheory/ModularForms/Bounds.lean,Mathlib/NumberTheory/ModularForms/Cusps.lean,Mathlib/NumberTheory/ModularForms/Identities.lean,Mathlib/NumberTheory/ModularForms/LFunction.lean,Mathlib/NumberTheory/ModularForms/LevelOne.lean,Mathlib/NumberTheory/ModularForms/Petersson.lean,Mathlib/NumberTheory/ModularForms/QExpansion.lean	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-77042 4 days ago	unknown	unknown
31411	CoolRmal author:CoolRmal	feat : a convex lower-semicontinuous function is the supremum of a sequence of affine functions in a separable space	This lemma is needed in the proof of conditional Jensen's inequality: #27953 The lemmas in this PR need the RCLike API, so it is not suitable to put them in Mathlib.Topology.Semicontinuous or Mathlib.Analysis.Convex.Function as they does not import RCLike. I tried to put these lemmas in a RCLike related file but I encountered warnings about import (e.g. Modules starting with Mathlib.Topology are not allowed to import modules starting with ...). Therefore, I temporarily put them in [Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean](https://github.com/leanprover-community/mathlib4/pull/31411/files#diff-930cc0818908e1ab51f74f3729ae6de8ed43f7914e94ca07c619f48a4c49aa9c). --- - [ ] depends on: #31180 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis blocked-by-other-PR	337/10	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondJensen.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-76376 4 days ago	4-83764 4 days ago	0-129 2 minutes
31274	joelriou author:joelriou	feat(AlgebraicTopology): edges and "triangles" in the nerve of a category	We study `Edge` and `Edge.CompStruct` in the case of the nerve of a category. In particular, `Edge.CompStruct` are related to commutative triangles. --- - [x] depends on: #31254 - [ ] depends on: #31265 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology blocked-by-other-PR WIP	383/19	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/ComposableArrows.lean	9	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-75855 4 days ago	4-75873 4 days ago	0-1 1 second
31174	joelriou author:joelriou	refactor(AlgebraicTopology): refactor the homotopy category and the nerve adjunction	WIP --- - [x] depends on: #31248 - [ ] depends on: #31250 - [x] depends on: #31254 - [ ] depends on: #31274 - [ ] depends on: #31265 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology blocked-by-other-PR WIP	1503/773	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/Composition.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/Combinatorics/Quiver/ReflQuiver.lean	17	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-75423 4 days ago	4-75447 4 days ago	0-1 1 second
31325	joelriou author:joelriou	feat(AlgebraicTopology): a computable monoidal functor instance for `hoFunctor`	--- - [ ] depends on: #31174 - [ ] depends on: #31250 - [x] depends on: #31254 - [ ] depends on: #31274 - [ ] depends on: #31265 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology blocked-by-other-PR	2053/777	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialNerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HoFunctorMonoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/Category/ReflQuiv.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Functor/Currying.lean,Mathlib/CategoryTheory/Functor/CurryingThree.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/FunctorCategory.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/Composition.lean,Mathlib/CategoryTheory/PathCategory/Basic.lean,Mathlib/Combinatorics/Quiver/ReflQuiver.lean	23	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-75400 4 days ago	4-75423 4 days ago	0-2350 39 minutes
31426	joelriou author:joelriou	feat(CategoryTheory): DiagramWithUniqueTerminal	This PR set ups the type `DiagramWithUniqueTerminal` of diagrams of bounded cardinality with a unique terminal object in a filtered category. This shall be used in #30605 in order to show that for any filtered category, there is a final functor from a directed poset. --- - [ ] depends on: #31421 - [ ] depends on: #31424 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	417/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/HasCardinalLT.lean,Mathlib/CategoryTheory/ObjectProperty/HasCardinalLT.lean,Mathlib/CategoryTheory/Presentable/Directed.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-67150 4 days ago	4-67151 4 days ago	0-1 1 second
30605	joelriou author:joelriou	feat(CategoryTheory): for any filtered category, there exists a final functor from a directed poset	In this PR, we formalize the proof by Deligne (SGA 4 I 8.1.6) that for any (small) filtered category `J`, there exists a final functor `F : α ⥤ J` where `α` is a directed partially ordered set (`IsFiltered.exists_directed`). The construction applies more generally to `κ`-filtered categories and `κ`-directed posets (`IsCardinalFiltered.exists_cardinal_directed`). --- - [ ] depends on: #31426 - [ ] depends on: #31421 - [ ] depends on: #31424 - [x] depends on: #30633 - [x] depends on: #30781 - [x] depends on: #30634 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	707/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Arrow.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean,Mathlib/CategoryTheory/MorphismProperty/HasCardinalLT.lean,Mathlib/CategoryTheory/ObjectProperty/HasCardinalLT.lean,Mathlib/CategoryTheory/Presentable/Directed.lean,docs/references.bib	8	4	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-67080 4 days ago	4-70892 4 days ago	0-1 1 second
29203	Hagb author:Hagb	feat(RingTheory/MvPolynomial/Groebner) : add Gröbner basis	Definitions: - `MonomialOrder.sPolynomial` - `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. TODO: - squeeze Non-terminal `simp`s - add comments to explain the proof of Buchberger Criterion. Co-authored-by: Hao Shen [3118181069@qq.com](mailto:3118181069@qq.com) --- CC @tsuki8 Upstreamize from https://github.com/WuProver/groebner_proj. - [ ] depends on: #26039 [![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	1773/4	Mathlib/RingTheory/MvPolynomial/Groebner.lean,Mathlib/RingTheory/MvPolynomial/Ideal.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder.lean,docs/references.bib	4	7	['Hagb', 'SnirBroshi', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-62886 4 days ago	16-14853 16 days ago	0-3218 53 minutes
28462	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the relative cell complex attached to a rank function for a pairing	--- - [ ] depends on: #31122 - [ ] depends on: #28351 - [ ] depends on: #28346 - [ ] 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 merge-conflict blocked-by-other-PR WIP	793/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/PairingCore.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RelativeCellComplex.lean,Mathlib/AlgebraicTopology/SimplicialSet/Subcomplex.lean	8	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-58439 4 days ago	9-64275 9 days ago	0-1 1 second
25825	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Bicategory): define lax transformations between oplax functors	and also define oplax transformations between lax functors. - [ ] depends on: #25779 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #25672. Original PR: https://github.com/leanprover-community/mathlib4/pull/25672	large-import t-category-theory blocked-by-other-PR	431/10	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Lax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,scripts/noshake.json	4	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-58164 4 days ago	4-58182 4 days ago	0-1 1 second
30567	wwylele author:wwylele	feat(Combinatorics): generating function for partitions	This is the start of a series of PR aiming to prove two theorems related to partition: - [Glaisher's theorem](https://en.wikipedia.org/wiki/Glaisher%27s_theorem), which is a generalization of the existing [Euler's Partition theorem](https://github.com/leanprover-community/mathlib4/blob/master/Archive/Wiedijk100Theorems/Partition.lean). The proof will use the infinite generating function, upgrading the current proof that uses finite ones, and resolving this [TODO](https://github.com/leanprover-community/mathlib4/blob/master/Archive/Wiedijk100Theorems/Partition.lean#L66) - [Pentagonal number theorem](https://en.wikipedia.org/wiki/Pentagonal_number_theorem) and the recurrence relation on the partition function. I created a new file `Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean` to avoid importing PowerSeries stuff directly into the definition file, and along the way I moved the existing `Mathlib/Combinatorics/Enumerative/Partition.lean` to `Mathlib/Combinatorics/Enumerative/Partition/Basic.lean` . ~~Not sure why github didn't recognize this as a file move, but there is no diff in that file and the total diff is much smaller~~ --- - [ ] depends on: #31324 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed t-combinatorics blocked-by-other-PR	218/4	Archive/Wiedijk100Theorems/Partition.lean,Mathlib.lean,Mathlib/Algebra/Order/Antidiag/Finsupp.lean,Mathlib/Combinatorics/Enumerative/Partition/Basic.lean,Mathlib/Combinatorics/Enumerative/Partition/GenFun.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Defs.lean	7	38	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'wwylele']	YaelDillies assignee:YaelDillies	4-54906 4 days ago	4-54907 4 days ago	24-81574 24 days
28351	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): the rank function with values in natural numbers of a regular pairing	Given a regular pairing `P` for a subcomplex of a simplicial, following the work by Sean Moss, Another approach to the Kan-Quillen model structure, we show that the rank function relative to the well founded ancestrality relation has values in the type of natural numbers. --- - [ ] 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 blocked-by-other-PR WIP	277/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Pairing.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/Rank.lean,Mathlib/AlgebraicTopology/SimplicialSet/AnodyneExtensions/RankNat.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	4-48475 4 days ago	unknown	unknown
30576	smmercuri author:smmercuri	feat: `adicCompletion` for `Rat` is uniform isomorphic to `Padic`	--- - [ ] depends on: #30133 - [x] depends on: #30574 - [ ] depends on: #30363 - [ ] depends on: #30171 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	385/21	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/NumberTheory/Padics/HeightOneSpectrum.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/RingTheory/Coprime/Lemmas.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/Topology/Algebra/UniformRing.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean,Mathlib/Topology/Homeomorph/Defs.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-66593 3 days ago	29-68263 29 days ago	0-11 11 seconds
31034	chrisflav author:chrisflav	feat(RingTheory/Extension/Cotangent): basis of free cotangent space can be realized as a presentation	Let `S` be a finitely presented `R`-algebra and suppose `P : R[X] → S` generates `S` with kernel `I`. In this PR we show that if `I/I²` is free, there exists an `R`-presentation `P'` of `S` extending `P` with kernel `I'`, such that `I'/I'²` is free on the images of the relations of `P'`. From Pi1. --- - [ ] depends on: #30955 - [ ] depends on: #31036 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	431/21	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Basis.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Localization/Away/Basic.lean	12	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-64718 3 days ago	13-58566 13 days ago	0-943 15 minutes
31081	chrisflav author:chrisflav	feat(RingTheory/StandardSmooth): presentation independent characterization	We show that if `S` is of finite presentation over `R` such that `H¹(S/R) = 0` and `Ω[S⁄R]` is free on `{d sᵢ}ᵢ` for some `sᵢ : S`, then `S` is `R`-standard smooth. The converse of this is already in mathlib. From Pi1. --- - [ ] depends on: #31034 - [ ] depends on: #31082 - [ ] depends on: #28769 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory merge-conflict blocked-by-other-PR	824/32	Mathlib.lean,Mathlib/Algebra/BigOperators/Finsupp/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Algebra/Module/Submodule/Range.lean,Mathlib/Algebra/MvPolynomial/Eval.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Basis/Exact.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Span.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/RingTheory/Extension/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Basic.lean,Mathlib/RingTheory/Extension/Cotangent/Basis.lean,Mathlib/RingTheory/Extension/Cotangent/Free.lean,Mathlib/RingTheory/Extension/Generators.lean,Mathlib/RingTheory/Extension/Presentation/Basic.lean,Mathlib/RingTheory/Extension/Presentation/Submersive.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean,Mathlib/RingTheory/Localization/Away/Basic.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	29	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-52743 3 days ago	13-58564 13 days ago	0-319 5 minutes
31165	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection): base change of transvections	The base change of a transvection of a module. --- - [ ] depends on: #31138 - [ ] depends on: #31162 - [ ] depends on: #31240 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	662/7	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/BaseChange.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/LinearAlgebra/Transvection.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	3-24239 3 days ago	3-24247 3 days ago	0-770 12 minutes
31500	zcyemi author:zcyemi	feat(Analysis/Convex/Between): add lemmas on affine independence under strict betweenness	--- Add lemmas showing that affine independence is preserved when replacing a vertex by a point strictly between two others, and related results for triangles. deps: - [ ] depends on: #31498 - [ ] depends on: #31499	blocked-by-other-PR	101/0	Mathlib/Analysis/Convex/Between.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'zcyemi']	nobody	3-4854 3 days ago	3-5216 3 days ago	0-117 1 minute
27414	staroperator author:staroperator	feat(ModelTheory): Semilinear sets are closed under intersection, difference and complement	Separated from #27100. This PR proves that semilinear sets in any commutative monoid are closed under intersection, set difference and complement (requires finitely generated). We prove these results on `ℕ ^ k` first (which are private) and then generalize to any monoid. --- - [x] depends on: #27082 - [x] depends on: #27086 - [x] depends on: #27088 - [x] depends on: #27096 - [x] depends on: #27342 - [x] depends on: #27955 - [x] depends on: #28670 - [x] depends on: #29032 - [x] depends on: #29034 - [x] depends on: #29035 - [x] depends on: #29749 - [x] depends on: #29784 - [x] depends on: #29793 - [x] depends on: #30840 - [ ] depends on: #31497 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	976/4	Mathlib.lean,Mathlib/Algebra/Group/Ideal.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Basic.lean,Mathlib/ModelTheory/Arithmetic/Presburger/Semilinear/Defs.lean	4	40	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'staroperator']	fpvandoorn assignee:fpvandoorn	3-2282 3 days ago	3-3311 3 days ago	22-53104 22 days
26388	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map and the de Rham period rings	This PR continues the work from #21564. Original PR: https://github.com/leanprover-community/mathlib4/pull/21564 In this PR, we define Fontaine's theta map and the period ring B_dR. --- - [ ] depends on: #31298 [APIs lifting `W(O^\flat) -> O/p^n` to `W(O^\flat) -> O`] - [ ] depends on: #26386 [APIs for Frobenius]	t-ring-theory t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	625/0	Mathlib.lean,Mathlib/RingTheory/AdicCompletion/Algebra.lean,Mathlib/RingTheory/AdicCompletion/RingHom.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/Operations.lean,Mathlib/RingTheory/Perfectoid/BDeRham.lean,Mathlib/RingTheory/Perfectoid/FontaineTheta.lean,docs/references.bib	9	n/a	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	2-50124 2 days ago	unknown	unknown
26384	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map is surjective	This PR continues the work from #22332. Original PR: https://github.com/leanprover-community/mathlib4/pull/22332	t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	1109/15	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/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean,docs/references.bib	15	3	['github-actions', 'jjdishere', 'leanprover-community-bot-assistant']	nobody	2-50060 2 days ago	132-7575 4 months ago	0-135 2 minutes
30375	sinhp author:sinhp	feat(CategoryTheory): Basics of Locally Cartesian Closed Categories	See 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 blocked-by-other-PR WIP	1141/0	Mathlib.lean,Mathlib/CategoryTheory/Comma/Over/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Basic.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ChosenPullback.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/ExponentiableMorphism.lean,Mathlib/CategoryTheory/LocallyCartesianClosed/Sections.lean	6	6	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sinhp']	nobody	2-48211 2 days ago	2-48212 2 days ago	0-2073 34 minutes
30202	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add TopologicalSpace and LocallyConvexSpace instances.	Add `TopologicalSpace` instance to `ContDiffMapSupportedIn`, with the topology of uniform convergence of a function and all its derivatives. Add `LocallyConvexSpace` instance which follows. We also bundle `structureMapLM` as a continuous linear map, and state the universal property of the topology. Co-Authored by: @ADedecker --- - [ ] 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/)	t-analysis blocked-by-other-PR	243/15	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-46671 2 days ago	6-48624 6 days ago	0-1746 29 minutes
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`. --- - [ ] 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 merge-conflict blocked-by-other-PR label:t-algebra$	155/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Basic.lean,Mathlib/LinearAlgebra/Matrix/StarAlgEquiv.lean	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen']	nobody	2-37769 2 days ago	2-37770 2 days ago	0-412 6 minutes
31409	SnirBroshi author:SnirBroshi	feat(Analysis/SpecialFunctions/Gamma/BohrMollerup): the Gamma function has a minimum in (1, 2)	There's a number in `(1, 2)` which is a minimum of `Gamma` on `(0, ∞)`. The actual number is ≈ 1.46163... --- - [ ] depends on: #31407 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	24/0	Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-35107 2 days ago	5-9616 5 days ago	0-184 3 minutes
30236	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add withSeminorms instance.	Add `withSeminorms` instance to `ContDiffMapSupportedIn`, where the seminorm familiy is given by the sup-norm on the i-th derivative. Co-authored by: @ADedecker --- - [ ] 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/)	t-analysis blocked-by-other-PR	306/15	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Topology/ContinuousMap/Bounded/Basic.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	2-30968 2 days ago	5-51781 5 days ago	0-1122 18 minutes
31138	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Transvection): the determinant of transvection in a module is equal to 1	Proof that the determinant of a transvection is equal to 1. The proof goes by showing that the determinant of `LinearMap.transvection f v` is `1 + f v` (even if `f v` is nonzero). I first treat the case of a field, distinguishing whether `f v = 0` (so that we get a transvection) or not (so that we have a dilation). Then, by base change to the field of fractions, I can handle the case of a domain. Finally, the general case is treated by base change from the “universal case” where the base ring is the ring of polynomials in $$2n$$ indeterminates corresponding to the coefficients of $$f$$ and $$v$$. --- - [ ] depends on: #31164 - [ ] depends on: #31165 - [ ] depends on: #30987 - [ ] depends on: #31078 - [ ] depends on: #31162 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1925/21	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Charpoly/BaseChange.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/BaseChange.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/GeneralLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/Dual.lean,Mathlib/LinearAlgebra/Matrix/GeneralLinearGroup/Defs.lean,Mathlib/LinearAlgebra/Matrix/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/SpecialLinearGroup.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/LinearAlgebra/Transvection.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	22	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'ocfnash']	nobody	2-30409 2 days ago	2-37475 2 days ago	0-26 26 seconds
31452	jsm28 author:jsm28	feat(Analysis/Convex/StrictCombination): convex combinations in strictly convex sets and spaces	Add various lemmas that combinations of points (nonnegative weights, at least two weights of distinct points nonzero) in strictly convex sets lie in the interior of that set, or in strictly convex spaces or affine spaces for such spaces lie in a ball when the points lie in the corresponding closed ball. These are analogous to existing lemmas for convex combinations and for pairs of points in strictly convex sets or spaces. In particular, the way `StrictConvex.centerMass_mem_interior` is stated with various hypotheses after the colon follows how `Convex.centerMass_mem` is stated (the hypotheses could of course move before the colon if they were then generalized for the induction). Convenience lemmas for the cases of `closedInterior` (excluding vertices) of a simplex, and `interior` of a simplex, are included. https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Triangle.20interior.20and.20its.20circumsphere/with/540305703 requested such a statement (in a different form). They don't include anything for bundled spheres since those are currently defined in `Mathlib.Geometry.Euclidean`, though given a suitable more generic name for the bundled sphere structure, various basic material about such spheres could move to a more generic metric space location, at which point it would be reasonable to add versions of these statements that use bundled spheres. --- - [ ] depends on: #31450 - [ ] depends on: #31451 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-convex-geometry blocked-by-other-PR	190/0	Mathlib.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/StrictCombination.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-22867 2 days ago	4-21195 4 days ago	0-1111 18 minutes
31495	jsm28 author:jsm28	feat(Geometry/Euclidean/Sphere/SecondInter): `secondInter` and sides of faces of a simplex	Add lemmas that, if you take a simplex with one vertex on a sphere and the others on or inside it (typically, a triangle and its circumcircle), and take a line through the given vertex and a point in the interior of the simplex or the interior of the opposite face, the second intersection of that line with the sphere lies on the opposite side (from the vertex) of the face opposite that vertex. --- - [ ] depends on: #31451 - [ ] depends on: #31452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry blocked-by-other-PR	242/0	Mathlib.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/StrictCombination.lean,Mathlib/Geometry/Euclidean/Sphere/SecondInter.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-22836 2 days ago	3-16224 3 days ago	0-336 5 minutes
26213	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Ext iso quotient regular sequence	In this PR defined the `addequiv` between `Ext M N k` and `N =>[R] M/ rs * M` where `rs` is a regular sequence of length `k` Co-authored-by: Hu Yongle Co-authored-by: Wang Jingting --- - [ ] depends on: #26212 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	319/10	Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	4	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-74348 1 day ago	unknown	unknown
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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	678/10	Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	4	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-74260 1 day ago	unknown	unknown
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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1163/10	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/AuslanderBuchsbaum.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	6	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-74164 1 day ago	unknown	unknown
26351	RemyDegenne author:RemyDegenne	feat: covering and packing numbers of sets in a metric space	We define covering numbers of sets in a pseudo-metric space, which are minimal cardinalities of `ε`-covers of sets. We also define the packing number, which is the maximal cardinality of an `ε`-separated set. From the Brownian motion project. --- - [ ] depends on: #31537 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author blocked-by-other-PR	236/17	Mathlib.lean,Mathlib/Topology/MetricSpace/Cover.lean,Mathlib/Topology/MetricSpace/CoveringNumbers.lean	3	13	['ADedecker', 'RemyDegenne', 'YaelDillies', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot']	j-loreaux assignee:j-loreaux	1-74143 1 day ago	1-74145 1 day ago	45-38108 45 days
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/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	981/10	Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean	4	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-74027 1 day ago	unknown	unknown
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 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	999/10	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	6	n/a	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-73931 1 day ago	unknown	unknown
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/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	1989/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	8	n/a	['Thmoas-Guan', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-72460 1 day ago	unknown	unknown
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/)	large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	2381/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	9	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69925 1 day ago	unknown	unknown
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/)	large-import t-algebra blocked-by-other-PR label:t-algebra$	2557/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Catenary.lean,Mathlib/RingTheory/CohenMacaulay/Unmixed.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	10	n/a	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69830 1 day ago	unknown	unknown
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. --- - [ ] depends on: #28682 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR WIP	158/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean	3	4	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69300 1 day ago	15-85164 15 days ago	0-153 2 minutes
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. --- - [ ] depends on: #28682 - [ ] depends on: #28582 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR WIP	472/0	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean	4	4	['Thmoas-Guan', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69148 1 day ago	16-108 16 days ago	0-111 1 minute
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/)	large-import blocked-by-other-PR	3001/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/Support.lean	23	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69054 1 day ago	32-41898 1 month 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/)	large-import blocked-by-other-PR	3196/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68873 1 day ago	unknown	unknown
29670	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): projective dimension equal supremum of localized module	In this PR, we proved that for a finitely generated module `M` over a noetherian ring `R`, `projdim_R(M)` is equal to the supremum `projdim (M_p)` (viewed as `R_p` module) as `p` run over all prime/maximal ideals. We also proved that the global dimension of `R` is equal to the supremeum of global dimension of `R_p` as p run over all prime/maximal ideals. --- - [ ] depends on: #29558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory blocked-by-other-PR	564/0	Mathlib.lean,Mathlib/RingTheory/GlobalDimension.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68659 1 day ago	50-65795 1 month ago	0-56 56 seconds
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/)	large-import blocked-by-other-PR	3456/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	14	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68525 1 day ago	unknown	unknown
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: #29670 - [ ] depends on: #29534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3909/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68433 1 day ago	unknown	unknown
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	326/0	Mathlib.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Polynomial.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68092 1 day ago	15-84484 15 days ago	0-10179 2 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/)	large-import blocked-by-other-PR	4156/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.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	18	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68010 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	2858/10	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean	12	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-67829 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	4709/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.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	19	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-67723 1 day ago	unknown	unknown
30309	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): Add module instance to TestFunction	Add module instance to TestFunction --- - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] depends on: #30239 - [ ] depends on: #30236 - [ ] depends on: #30202 - [ ] 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	691/5	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	1-64354 1 day ago	27-45421 27 days ago	0-2572 42 minutes
30799	YaelDillies author:YaelDillies	refactor: unify the two versions of `pow_eq_one_iff`	One version is about torsion-free monoids, the other one about linearly ordered monoids. I argue that all linearly ordered monoids of interest are torsion-free, and therefore the correct lemma to keep is the former. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Should.20linear.20ordered.20comm.20monoids.20with.20zero.20be.20torsion-free) --- - [x] depends on: #30680 - [x] depends on: #31024 - [x] depends on: #31025 - [x] depends on: #31026 - [ ] depends on: #31027 - [x] depends on: #31283 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra awaiting-CI blocked-by-other-PR label:t-algebra$	180/214	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Int/Defs.lean,Mathlib/Algebra/Group/Nat/Defs.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/GroupWithZero/Torsion.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled/Defs.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Ring/NonZeroDivisors.lean,Mathlib/Algebra/Ring/Torsion.lean,Mathlib/Data/Nat/Prime/Pow.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/ZMod/UnitsCyclic.lean	17	7	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-63536 1 day ago	1-63553 1 day ago	0-10164 2 hours
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/)	t-meta awaiting-author blocked-by-other-PR	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	6	['FLDutchmann', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-63222 1 day ago	2-54916 2 days ago	0-0 0 seconds
26291	RemyDegenne author:RemyDegenne	feat(Probability): Cameron-Martin theorem	- Definition of the Cameron-Martin space of a Gaussian measure - The Cameron-Martin theorem: shifting a Gaussian measure by an element of the Cameron-Martin space gives an equivalent measure, and shifting by an element which is not in the Cameron-Martin space gives a mutually singular measure. --- - [x] depends on: #24975 - [x] depends on: #24969 - [x] depends on: #24930 - [x] depends on: #24925 - [x] depends on: #24900 - [x] depends on: #25532 - [x] depends on: #27022 - [x] depends on: #27027 - [x] depends on: #27029 - [x] depends on: #27123 - [x] depends on: #27610 - [x] depends on: #28342 - [x] depends on: #28343 - [x] depends on: #30167 - [x] depends on: #30346 - [ ] depends on: #30348 - [ ] depends on: #30582 [![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	t-measure-probability merge-conflict blocked-by-other-PR WIP	1963/13	Mathlib.lean,Mathlib/MeasureTheory/Function/ConvergenceInDistribution.lean,Mathlib/MeasureTheory/Measure/Portmanteau.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/EMetricSpace/Lipschitz.lean,Mathlib/Topology/UniformSpace/AbstractCompletion.lean,docs/1000.yaml	14	10	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-61652 1 day ago	35-53631 1 month ago *	0-2 2 seconds *
31533	ADedecker author:ADedecker	feat: add module instance for test functions	This code comes from #30309 from @luigi-massacci, who is the main author of this file. I am just opening another PR in order to parallelize the review work, and cleaning up a few things based on previous PR reviews. --- - [ ] depends on: #31470 - [ ] depends on: #31549 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	276/10	Archive/Hairer.lean,Mathlib.lean,Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Analysis/Distribution/TestFunction.lean,Mathlib/Topology/Algebra/Support.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-59870 1 day ago	1-64715 1 day ago	0-0 0 seconds
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/)	t-meta blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-55050 1 day ago	2-51134 2 days ago	0-1388 23 minutes
30563	YaelDillies author:YaelDillies	chore(Algebra): replace `NoZeroSMulDivisors` with `Module.IsTorsionFree`	`NoZeroSMulDivisors R M` is mathematically wrong when `R` isn't a domain, so we replace it with the better definition `Module.IsTorsionFree R M`. In fact, it never holds in such case unless `M` is trivial. Here's a proof that `NoZeroSMulDivisors R M` implies `NoZeroDivisors R`. If `m : M` is non-zero and `r s : R` are such that `r * s = 0`, then `r • s • m = (r * s) • m = 0`, so by `NoZeroSMulDivisors` we get `r = 0 ∨ s = 0 ∨ m = 0`. But `m ≠ 0`, so `r = 0 ∨ s = 0`, as wanted. This means that one can eagerly replace `NoZeroSMulDivisors R M` with `NoZeroDivisors R` + `Module.IsTorsionFree R M`. Doing so, some lemmas become vacuous and some instances redundant. We remove them. Since `NoZeroDivisors R` is usually mathematically incorrect when `R` is a semiring, I in fact replace `NoZeroSMulDivisors R M` with `IsDomain R` + `Module.IsTorsionFree R M`. --- - [x] depends on: #30614 - [x] depends on: #30628 - [ ] depends on: #30678 - [x] depends on: #30683 - [x] depends on: #30707 - [x] depends on: #30708 - [x] depends on: #30716 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra blocked-by-other-PR WIP label:t-algebra$	1637/1301	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/Central/Basic.lean,Mathlib/Algebra/CharP/LinearMaps.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Finset.lean,Mathlib/Algebra/GroupWithZero/Action/Pointwise/Set.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/GroupWithZero/Regular.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/Linear.lean,Mathlib/Algebra/Module/Basic.lean,Mathlib/Algebra/Module/Card.lean,Mathlib/Algebra/Module/Lattice.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/Module/Submodule/Basic.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Module/Submodule/Union.lean,Mathlib/Algebra/Module/Torsion/Basic.lean,Mathlib/Algebra/Module/Torsion/Free.lean,Mathlib/Algebra/Module/TransferInstance.lean,Mathlib/Algebra/MonoidAlgebra/Module.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/NoZeroSMulDivisors/Defs.lean,Mathlib/Algebra/NoZeroSMulDivisors/Pi.lean,Mathlib/Algebra/NoZeroSMulDivisors/Prod.lean,Mathlib/Algebra/Order/BigOperators/Expect.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Order/Module/Field.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Domain.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Module/FiniteDimensional.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/Algebra/QuadraticAlgebra.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Action/Pointwise/Finset.lean,Mathlib/Algebra/Ring/Action/Pointwise/Set.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Analysis/Analytic/IsolatedZeros.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/Extreme.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Convex/Strict.lean,Mathlib/Analysis/Normed/Module/Ball/Action.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/Data/ENNReal/Action.lean,Mathlib/Data/Finsupp/SMul.lean,Mathlib/Data/Finsupp/Weight.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean,Mathlib/FieldTheory/Minpoly/IsIntegrallyClosed.lean,Mathlib/FieldTheory/PurelyInseparable/Basic.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/FieldTheory/Tower.lean,Mathlib/Geometry/Euclidean/Triangle.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Slope.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Submodule.lean,Mathlib/LinearAlgebra/BilinearForm/DualLattice.lean,Mathlib/LinearAlgebra/BilinearForm/Properties.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/RankNullity.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Matrix.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/LinearAlgebra/Eigenspace/Pi.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Lemmas.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/PerfectPairing/Restrict.lean,Mathlib/LinearAlgebra/Ray.lean	165	16	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-53576 1 day ago	1-53597 1 day ago	0-119 1 minute
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.	t-differential-geometry blocked-by-other-PR WIP	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	1-52795 1 day ago	3-27654 3 days ago	0-77 1 minute
31561	EtienneC30 author:EtienneC30	feat: monotonicity of Holderianity	Prove many results related to the following two: - If a function is `r`-Hölder over a bounded space, then it is also `s`-Hölder when `s ≤ r`. - If a function is `r`-Hölder and `t`-Hölder, then it is `s`-Hölder for `r ≤ s ≤ t`. --- - [ ] depends on: #31555 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	100/0	Mathlib/Topology/MetricSpace/HolderNorm.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Defs.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-45577 1 day ago	1-45578 1 day ago	0-2536 42 minutes
30920	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	This is a migration of #25561 to a fork. --- - [ ] depends on: #30132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	287/23	Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Grpd.lean	2	3	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-44045 1 day ago	18-80127 18 days ago	0-117 1 minute
31567	EtienneC30 author:EtienneC30	feat: characteristic function of a Gaussian measure	--- - [ ] depends on: #31565 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	32/0	Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-33361 1 day ago	1-33362 1 day ago	0-245 4 minutes
30921	EtienneC30 author:EtienneC30	feat: characterizing Gaussian measures through the shape of the characteristic function	Prove that Gaussian measures over a Banach space `E` are exactly those measures `μ` such that there exist `m : E` and `f : StrongDual ℝ E →L[ℝ] StrongDual ℝ E →L[ℝ] ℝ` satisfying `f.toBilinForm.IsPosSemidef` and `charFunDual μ L = exp (L m * I - f L L / 2)`. Prove that such `m` and `f` are unique and equal to `∫ x, x ∂μ` and `covarianceBilinDual μ`. Specialize these statements in the case of Hilbert spaces, with `f : E →L[ℝ] E →L[ℝ] ℝ`, `charFun μ t = exp (⟪t, m⟫ * I - f t t / 2)` and `f = covarianceBilin μ`. --- - [x] depends on: #30371 - [ ] depends on: #31564 - [ ] depends on: #31566 - [ ] depends on: #31567 from BrownianMotion [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability blocked-by-other-PR	259/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean,Mathlib/Probability/Distributions/Gaussian/CharFun.lean,Mathlib/Probability/Distributions/Gaussian/Real.lean,Mathlib/Probability/Moments/CovarianceBilinDual.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-32775 1 day ago	1-33302 1 day ago	0-24520 6 hours
30744	grunweg author:grunweg	feat: more extensions for differential geometry elaborators	Support inferring a model with corners in all remaining instances in mathlib, except for products and direct sums: - on Euclidean space, half-space or quadrants. - for the units in a normed algebra (including GL(V)) - the unit interval - on the complex unit circle - on a metric sphere in a real or complex inner product space (WIP) --- - [x] depends on: #30413 - [ ] depends on: #30879 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta blocked-by-other-PR	475/52	Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/Notation.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean	4	7	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'thorimur']	thorimur assignee:thorimur	1-30633 1 day ago	17-41342 17 days ago	0-2603 43 minutes
30463	grunweg author:grunweg	feat: support products and disjoint unions in the differential geometry elaborators	Add support for inferring a model with corners on - products of manifolds - disjoint unions of manifolds - an open subset of a manifold Note that these can be nested (e.g., a product with multiple factors, a disjoint union of four manifolds or combinations of these). For binary products of normed spaces, we intentionally refuse to infer a model with corners, as there are two different possible options which are propositionally, but not definitionally equal. For now, we emit a warning to this effect instead. A future PR may remove it (and infer one of these variants): see [zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Differential.20geometry.20elaborators.20experiment/near/544942546). --- ~~Baby version of #30421.~~ This seems to be the full version. Open subsets do not work well yet, that's a bug to fix. - [ ] depends on: #30744 - [ ] depends on: #30879 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry t-meta blocked-by-other-PR	905/63	Mathlib/Geometry/Manifold/Instances/UnitsOfNormedAlgebra.lean,Mathlib/Geometry/Manifold/Notation.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,mathlib-immersions	5	5	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	thorimur assignee:thorimur	1-30304 1 day ago	1-30330 1 day ago	0-484 8 minutes
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`, also notated as `M1 * M2`, a direct construction without ε-transitions. - Theorem `concat_accepts : (M1 * M2).accepts = M1.accepts * M2.accepts`, showing the correctness of the construction. - Theorem `IsRegular.concat`, showing that regular languages are closed under concatenation. --- - [ ] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor blocked-by-other-PR	258/6	Mathlib/Computability/NFA.lean	1	22	['ctchou', 'github-actions', 'lambda-fairy', 'mathlib4-dependent-issues-bot', 'rudynicolop']	nobody	1-29139 1 day ago	16-21233 16 days ago	4-2407 4 days
31492	fcoUnda author:fcoUnda	Nthroot improvement	Resolve TODO for nthroot, replacing the dependency on the arithmetic geometric mean inequality by some inequalities on powers of binomials. --- - [ ] depends on: #31502 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author blocked-by-other-PR	95/28	Mathlib/Analysis/SpecialFunctions/Pow/NthRootLemmas.lean	1	14	['fcoUnda', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	1-14376 1 day ago	2-41447 2 days ago	0-65326 18 hours
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/)	large-import new-contributor merge-conflict blocked-by-other-PR	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	1-13747 1 day ago	1-13748 1 day ago	0-241 4 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/)	large-import new-contributor merge-conflict blocked-by-other-PR	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	1-13746 1 day ago	1-13747 1 day ago	0-1234 20 minutes
29819	mcdoll author:mcdoll	feat(Analysis/Distribution): tempered distributions	--- This is mainly a tracking PR: Most features will be PR'd separately. - [x] depends on: #29818 - [x] depends on: #29821 - [x] depends on: #29846 - [x] depends on: #29860 - [x] depends on: #30174 - [x] depends on: #30175 - [x] depends on: #30176 - [x] depends on: #30180 - [x] depends on: #30195 - [x] depends on: #31075 - [ ] depends on: #31074 - [x] depends on: #29888 - [x] depends on: #31073 - [ ] depends on: #29948 - [ ] depends on: #31076 - [ ] depends on: #31079 - [x] depends on: #31112 - [x] depends on: #31115 - [ ] depends on: #31114 - [x] depends on: #11496 - [x] depends on: #31085 - [ ] depends on: #31577 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR WIP	2365/156	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Distribution/DenseLp.lean,Mathlib/Analysis/Distribution/FourierMultiplier.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Distribution/TemperedDistribution.lean,Mathlib/Analysis/Fourier/FourierTransform.lean,Mathlib/Analysis/Fourier/L2Space.lean,Mathlib/Analysis/Fourier/Notation.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/InnerProductSpace/Extend.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/PointwiseConvergence.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,docs/undergrad.yaml	23	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-9489 1 day ago	44-34670 1 month ago	0-2 2 seconds
31568	joelriou author:joelriou	feat(CategoryTheory/Triangulated): truncation functors for t-structures	In this PR, we introduce the truncation functors `< n` and ` ≥ n` for a `t`-structure. --- - [ ] depends on: #31536 - [ ] depends on: #31539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory blocked-by-other-PR WIP	443/0	Mathlib.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean,Mathlib/CategoryTheory/Triangulated/TStructure/TruncLTGE.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-77559 21 hours ago	1-32391 1 day ago	0-2 2 seconds
31565	EtienneC30 author:EtienneC30	feat: characteristic function equals dual characteristic function	--- - [ ] depends on: #31563 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	14/0	Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean	2	4	['EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	0-76109 21 hours ago	1-33361 1 day ago	0-971 16 minutes
26973	peabrainiac author:peabrainiac	feat(Geometry/Diffeology): diffeologies generated from sets of plots	Introduces diffeologies generated from sets of plots, shows that this defines a Galois insertion, and concludes that the diffeologies on a type form a complete lattice. --- This PR continues the work from #22724. - [ ] depends on: #26484	t-differential-geometry merge-conflict blocked-by-other-PR	629/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib	3	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'peabrainiac']	nobody	0-74001 20 hours ago	0-74002 20 hours ago	0-785 13 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. - [ ] depends on: #26973 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict blocked-by-other-PR	766/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,Mathlib/Geometry/Diffeology/Continuous.lean,docs/references.bib	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-73877 20 hours ago	0-73878 20 hours ago	0-1796 29 minutes
31588	joelriou author:joelriou	feat(CategoryTheory/ComposableArrows): compositions of 1 or 2 morphisms	--- - [ ] depends on: #31584 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	1013/907	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/ComposableArrows/One.lean,Mathlib/CategoryTheory/ComposableArrows/Two.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/TransfiniteCompositionOfShape.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/ComposableArrows.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean	11	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-67107 18 hours ago	0-67108 18 hours ago	0-2 2 seconds
31586	joelriou author:joelriou	feat(CategoryTheory/Triangulated): spectral objects	In this file, we introduce the category `SpectralObject C ι` of spectral objects in a pretriangulated category `C` indexed by the category `ι`, a notion introduced by Verdier in order to give a nice presentation of spectral sequences. In the short term, I intend to PR the construction of the spectral object consisting of all truncations of an object in a triangulated category equipped with a t-structure. In a more distant future, the analogous notion of spectral object in an abelian category shall be introduced, and spectral sequences will be constructed by combining two facts : 1. by applying an homological functor, a spectral object in a triangulated category can be transformed into a spectral object in an abelian category (easy) 2. spectral sequences are attached to spectral objects in abelian categories (very technical) --- - [ ] depends on: #31584 - [ ] depends on: #31588 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	1191/907	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/AlgebraicTopology/SimplicialSet/Nerve.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/ComposableArrows/Basic.lean,Mathlib/CategoryTheory/ComposableArrows/One.lean,Mathlib/CategoryTheory/ComposableArrows/Two.lean,Mathlib/CategoryTheory/Limits/Shapes/Preorder/TransfiniteCompositionOfShape.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/ComposableArrows.lean,Mathlib/CategoryTheory/Triangulated/Basic.lean,Mathlib/CategoryTheory/Triangulated/Functor.lean,Mathlib/CategoryTheory/Triangulated/SpectralObject.lean	13	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-67105 18 hours ago	0-67106 18 hours ago	0-2 2 seconds
31455	kim-em author:kim-em	feat: products of locally contractible spaces	--- - [ ] depends on: #31453 - [ ] depends on: #31454	t-topology blocked-by-other-PR	222/0	Mathlib.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/Homotopy/Contractible.lean,Mathlib/Topology/Homotopy/LocallyContractible.lean,docs/references.bib	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-67082 18 hours ago	0-67083 18 hours ago	3-38941 3 days
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). --- - [ ] depends on: #31506 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 blocked-by-other-PR	1561/6	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Algebra/Basic.lean,Mathlib/Tactic/Algebra/Lemmas.lean,Mathlib/Util/Qq.lean,MathlibTest/Algebra.lean,scripts/noshake.json	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-65907 18 hours ago	2-59163 2 days ago	0-219 3 minutes
30931	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Gorenstein local ring	In this PR, we give the definition of Gorenstein local ring. --- - [ ] depends on: #30532 - [ ] depends on: #26218 - [ ] depends on: #29670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	4968/35	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/BaseChange.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LeftExact.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Gorenstein/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	23	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60421 16 hours ago	unknown	unknown
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. However, this result does not seem to be known to Mathlib. * 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 --- - [ ] depends on: #31548 - [ ] depends on: #31547 - [ ] depends on: #31558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	1371/1	Mathlib.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SaddlePoint.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Semicontinuous.lean,Mathlib/Topology/Sion.lean,Mathlib/Topology/Sublevel.lean,docs/references.bib	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-60390 16 hours ago	1-48450 1 day ago	0-536 8 minutes
25797	dagurtomas author:dagurtomas	feat(Condensed): closed symmetric monoidal structure on light condensed modules	--- - [ ] depends on: #31345 - [x] depends on: #25794 - [x] depends on: #24490 - [x] depends on: #24522 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) --- This PR continues the work from #24523. Original PR: https://github.com/leanprover-community/mathlib4/pull/24523	large-import t-condensed merge-conflict blocked-by-other-PR	127/4	Mathlib.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/Light/Monoidal.lean	5	7	['github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-58309 16 hours ago	0-58310 16 hours ago	0-3 3 seconds
30532	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` Co-authored-by: Wang Jingting --- - [x] depends on: #27416 - [ ] depends on: #30676 - [ ] depends on: #31222 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict awaiting-author blocked-by-other-PR WIP	1241/5	Mathlib.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/BaseChange.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LeftExact.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean	13	n/a	['Thmoas-Guan', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-56762 15 hours ago	unknown	unknown
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 --- - [ ] depends on: #31218 - [ ] depends on: #31219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	267/5	Mathlib.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LeftExact.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-56134 15 hours ago	0-56135 15 hours ago	0-266 4 minutes
31368	dagurtomas author:dagurtomas	feat(Condensed): characterize internal projectivity	--- - [ ] depends on: #30800 - [ ] depends on: #25797 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	580/12	Mathlib.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/Light/Functors.lean,Mathlib/Condensed/Light/InternallyProjective.lean,Mathlib/Condensed/Light/Monoidal.lean,Mathlib/Topology/Category/CompHausLike/Cartesian.lean,Mathlib/Topology/Category/LightProfinite/Cartesian.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-56008 15 hours ago	0-56009 15 hours ago	0-837 13 minutes
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/)	t-differential-geometry t-meta blocked-by-other-PR WIP	1101/64	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-52272 14 hours ago	0-78599 21 hours ago	0-1 1 second
31406	JovanGerb author:JovanGerb	feat(push_neg): `push_neg +distrib` syntax	This PR adds the syntax `push_neg +distrib`, `by_cases! +distrib`, `contrapose! +distrib` and `by_contra! +distrib`. This is much more convenient to use than writing out `set_option push_neg.use_distrib true in`. All uses of the `set_option` version have been replaced with the new syntax. I also add a missing `namespace` in the definition of `by_cases!` --- - [ ] depends on: #31597 - [ ] depends on: #31510 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta blocked-by-other-PR	100/55	Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/UniqueProds/Basic.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/RootSystem/GeckConstruction/Semisimple.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/NumberTheory/WellApproximable.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Tactic/ByCases.lean,Mathlib/Tactic/ByContra.lean,Mathlib/Tactic/Contrapose.lean,Mathlib/Tactic/Push.lean,MathlibTest/Contrapose.lean,MathlibTest/byContra.lean,MathlibTest/push_neg.lean	17	15	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	grunweg assignee:grunweg	0-46619 12 hours ago	0-46716 12 hours ago	3-68795 3 days
31478	BGuillemet author:BGuillemet	feat(CategoryTheory/Sites): `uliftYoneda` for sheaves over a subcanonical topology	Add that `GrothendieckTopology.uliftYoneda` is fully faithful. Add the (functorial) Yoneda lemma for sheaves, for both `yoneda` and `uliftYoneda`. --- - [ ] depends on: #27821 - [ ] depends on: #31538 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	192/65	Mathlib/CategoryTheory/Sites/Canonical.lean,Mathlib/CategoryTheory/Sites/Sheaf.lean,Mathlib/CategoryTheory/Sites/Subcanonical.lean,Mathlib/CategoryTheory/Sites/Whiskering.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-45917 12 hours ago	0-45918 12 hours ago	0-334 5 minutes
31059	gasparattila author:gasparattila	feat(Topology/Sets): define the Vietoris topology on `(Nonempty)Compacts`	This PR defines the Vietoris topology on `Compacts` and `NonemptyCompacts`, and proves that it is induced by the Hausdorff uniformity. --- - [ ] depends on: #31031 - [x] depends on: #31058 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	448/32	Mathlib.lean,Mathlib/Data/Rel.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/UniformSpace/Closeds.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-40476 11 hours ago	8-59697 8 days ago	0-3475 57 minutes
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 commuative semiring with cancellative addition satisfies the strong rank condition. --- - [x] depends on: #27842 - [x] depends on: #27862 - [ ] 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 merge-conflict blocked-by-other-PR label:t-algebra$	1000/120	Mathlib.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/Basic.lean,Mathlib/RingTheory/Localization/Defs.lean,Mathlib/RingTheory/Localization/StrongRankCondition.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean	17	6	['alreadydone', 'chrisflav', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	chrisflav assignee:chrisflav	0-39532 10 hours ago	0-39532 10 hours ago	17-3113 17 days
31364	YaelDillies author:YaelDillies	feat: binomial random graphs	From LeanCamCombi and formal-conjectures --- - [x] depends on: #31391 - [ ] depends on: #31392 - [x] depends on: #31393 - [x] depends on: #31394 - [ ] depends on: #31396 - [x] depends on: #31397 - [ ] depends on: #31398 - [x] depends on: #31442 - [ ] depends on: #31443 - [x] depends on: #31445 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability t-combinatorics blocked-by-other-PR	318/21	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/MeasurableSpace/Constructions.lean,Mathlib/MeasureTheory/Measure/Dirac.lean,Mathlib/MeasureTheory/Measure/Restrict.lean,Mathlib/MeasureTheory/Measure/Typeclasses/Probability.lean,Mathlib/Probability/Combinatorics/BinomialRandomGraph/Defs.lean,Mathlib/Probability/Combinatorics/README.md,Mathlib/Probability/Distributions/BinomialRandom.lean,Mathlib/Probability/Independence/InfinitePi.lean,Mathlib/Probability/ProductMeasure.lean,Mathlib/Topology/UnitInterval.lean	13	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-34847 9 hours ago	0-80176 22 hours ago	0-13 13 seconds
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. --- - [ ] depends on: #31038 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor blocked-by-other-PR	518/6	Mathlib/Computability/NFA.lean	1	3	['ctchou', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-18026 5 hours ago	0-23033 6 hours ago	0-854 14 minutes
31142	thorimur author:thorimur	feat(Linter): port unused `Decidable*` instance hypothesis linter	WIP (but in a working state :) ) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter blocked-by-other-PR	469/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/UnusedDecidable.lean,MathlibTest/UnusedDecidable.lean	4	1	['github-actions']	nobody	0-16784 4 hours ago	13-6650 13 days ago	0-0 0 seconds

Other lists of PRs

Some other lists of PRs which could be useful:

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 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
26310	kckennylau author:kckennylau	Binary form	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/)	t-algebra awaiting-author label:t-algebra$	73/0	Mathlib.lean,Mathlib/RingTheory/MvPolynomial/BinaryForm.lean	2	13	['MichaelStollBayreuth', 'github-actions', 'kckennylau', 'mathlib4-dependent-issues-bot', 'ocfnash']	ocfnash assignee:ocfnash	70-62918 2 months ago	86-52589 2 months ago	57-1104 57 days
27254	yuanyi-350 author:yuanyi-350	2025 imo problem3	- [x] depends on: #28788 - [x] depends on: #28790 - [x] depends on: #28829 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	231/0	Archive.lean,Archive/Imo/Imo2025Q3.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean	3	28	['github-actions', 'jsm28', 'kbuzzard', 'leanprover-community-bot-assistant', 'madvorak', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'themathqueen', 'wwylele', 'yuanyi-350']	jsm28 assignee:jsm28	30-79261 30 days ago	72-23803 2 months ago	105-85062 105 days
30121	idontgetoutmuch author:idontgetoutmuch	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/)	new-contributor t-differential-geometry awaiting-author	227/0	Mathlib.lean,Mathlib/Geometry/Manifold/PrincipalFiberBundle/PrincipalGBundle.lean	2	5	['github-actions', 'grunweg']	hrmacbeth assignee:hrmacbeth	17-55765 17 days ago	17-55765 17 days ago	25-22983 25 days
30667	FrederickPu author:FrederickPu	Subgroup mul	Title: Algebra: pointwise products for subgroups Description: showed the point-wise product of disjoint subgroups is equivalent to their Cartesian product --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra awaiting-author label:t-algebra$	47/0	Mathlib/Algebra/Group/Subgroup/Pointwise.lean	1	10	['FrederickPu', 'eric-wieser', 'github-actions', 'plp127', 'tb65536']	nobody	16-60268 16 days ago	25-50302 25 days ago	0-46291 12 hours
31102	JOSHCLUNE author:JOSHCLUNE	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/)	new-contributor	61/4	Mathlib/Tactic/Common.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,MathlibTest/Hammer.lean,lake-manifest.json,lakefile.lean	5	1	['github-actions']	nobody	14-35160 14 days ago	14-42068 14 days ago	14-42051 14 days
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/)	CI awaiting-author	1/1	bors.toml	1	3	['bryangingechen', 'eric-wieser', 'github-actions']	nobody	13-45614 13 days ago	13-45614 13 days ago	0-64677 17 hours
30525	515801431 author:515801431	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.	new-contributor t-combinatorics	109/0	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Polya.lean	2	2	['IvanRenison', 'github-actions']	awainverse assignee:awainverse	13-21691 13 days ago	31-15705 1 month ago	31-15739 31 days
28215	5hv5hvnk author:5hv5hvnk	Draft PR, for 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/)	new-contributor t-combinatorics awaiting-author	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	3	['github-actions', 'grunweg']	nobody	10-77101 10 days ago	82-53074 2 months ago	12-41939 12 days
30246	dwrensha author:dwrensha	make Nat.digits use well-founded recursion once again	#25864 made `Nat.digits` structurally recursive, which has some benefits. In doing so, however, it added significant complexity. As brought up in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/structural.20recursion.20instead.20of.20well.20founded/near/543172385), on the balance that PR might not be considered an improvement. The present PR reverts that change (but keeps a code golf that was bundled with it). Note that recent improvements to core Lean mean that `simp` can handle the structurally recursive version without a problem: ```lean example : digits 10 123456789 = [9,8,7,6,5,4,3,2,1] := by simp [digits, digitsAux] ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	7/45	Mathlib/Data/Nat/Digits/Defs.lean	1	8	['alreadydone', 'dwrensha', 'github-actions', 'j-loreaux', 'plp127']	TwoFX assignee:TwoFX	9-38543 9 days ago	39-50041 1 month ago	39-50070 39 days
31072	euprunin author:euprunin	golf(Combinatorics/Quiver/Path): golf `exists_eq_comp_and_notMem_tail_of_mem_vertices` using `grind`	--- Show trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices`: 38 ms before, 46 ms after ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` before PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..35d3daa185 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.039993] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.038334] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.036860] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036855] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.036851] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e [… 447 lines omitted …] have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014253] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014250] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014246] with_annotate_state"by" ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014243] ( intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this) [Elab.step] [0.014240] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this [Elab.step] [0.014235] intro hmem have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by simpa [q₂', vertices_cons, concat_eq_append] using hmem cases hq2 : q₂.vertices with \| nil => simp [hq2] at hmem' \| cons y ys => have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in · exact h_not_tail <\| by simpa [hq2] · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last exact hxe_ne this Build completed successfully (521 jobs). ``` ### Trace profiling of `exists_eq_comp_and_notMem_tail_of_mem_vertices` after PR 31072 ```diff diff --git a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean index 9d27be9e85..d658dc1eb1 100644 --- a/Mathlib/Combinatorics/Quiver/Path/Vertices.lean +++ b/Mathlib/Combinatorics/Quiver/Path/Vertices.lean @@ -206,6 +206,7 @@ theorem exists_eq_comp_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : obtain ⟨v, p₁, p₂, hp, hv, rfl⟩ := p.exists_eq_comp_and_length_eq_of_lt_length n hn exact ⟨p₁, p₂, hp⟩ +set_option trace.profiler true in /-- Split a path at the last occurrence of a vertex. -/ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.vertices) : ∃ (p₁ : Path a v) (p₂ : Path v b), @@ -230,18 +231,7 @@ theorem exists_eq_comp_and_notMem_tail_of_mem_vertices {v : V} (hv : v ∈ p.ver intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e - have h_no_tail : v ∉ q₂'.vertices.tail := by - intro hmem - have hmem' : v ∈ (q₂.vertices ++ [(pPrev.cons e).end]).tail := by - simpa [q₂', vertices_cons, concat_eq_append] using hmem - cases hq2 : q₂.vertices with - \| nil => simp [hq2] at hmem' - \| cons y ys => - have hx_in : v ∈ ys ++ [(pPrev.cons e).end] := by simpa [hq2] using hmem' - obtain (hx_ys \| hx_last) := List.mem_append.mp hx_in - · exact h_not_tail <\| by simpa [hq2] - · have : v = (pPrev.cons e).end := by simpa [List.mem_singleton] using hx_last - exact hxe_ne this + have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => ``` ``` ℹ [521/521] Built Mathlib.Combinatorics.Quiver.Path.Vertices (1.1s) info: Mathlib/Combinatorics/Quiver/Path/Vertices.lean:210:0: [Elab.async] [0.047236] elaborating proof of Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.definition.value] [0.045901] Quiver.Path.exists_eq_comp_and_notMem_tail_of_mem_vertices [Elab.step] [0.044896] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044892] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => by_cases h_eq_end : v = (pPrev.cons e).end · exact h_case₁ h_eq_end · exact h_case₂ h_in_prefix h_eq_end \| inr h_eq_end => exact h_case₁ h_eq_end [Elab.step] [0.044888] induction p with \| nil => have hxa : v = a := by simpa [vertices_nil, List.mem_singleton] using hv subst hxa exact ⟨Path.nil, Path.nil, by simp only [comp_nil], by simp only [vertices_nil, tail_cons, not_mem_nil, not_false_eq_true]⟩ \| cons pPrev e ih => have hv' : v ∈ pPrev.vertices ∨ v = (pPrev.cons e).end := by simpa using (mem_vertices_cons pPrev e).1 hv have h_case₁ : v = (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by rintro rfl exact ⟨pPrev.cons e, Path.nil, by simp [comp_nil], by simp [vertices_nil]⟩ have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := by intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ cases hv' with \| inl h_in_prefix => [… 96 lines omitted …] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.029274] refine no_implicit_lambda% (have h_case₂ : v ∈ pPrev.vertices → v ≠ (pPrev.cons e).end → ∃ (p₁ : Path a v) (p₂ : Path v (pPrev.cons e).end), pPrev.cons e = p₁.comp p₂ ∧ v ∉ p₂.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025886] case body✝ => with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025862] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025858] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025854] with_annotate_state"by" ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025851] ( intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩) [Elab.step] [0.025848] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.025842] intro hxPrev hxe_ne obtain ⟨q₁, q₂, h_prev, h_not_tail⟩ := ih hxPrev let q₂' : Path v (pPrev.cons e).end := q₂.cons e have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] exact ⟨q₁, q₂', by simp [q₂', h_prev], h_no_tail⟩ [Elab.step] [0.022111] have h_no_tail : v ∉ q₂'.vertices.tail := by grind [vertices_cons, end_cons] [Elab.step] [0.022085] focus refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022082] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.022079] refine no_implicit_lambda% (have h_no_tail : v ∉ q₂'.vertices.tail := ?body✝; ?_) case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021564] case body✝ => with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021552] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021549] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021546] with_annotate_state"by" (grind [vertices_cons, end_cons]) [Elab.step] [0.021542] (grind [vertices_cons, end_cons]) [Elab.step] [0.021539] grind [vertices_cons, end_cons] [Elab.step] [0.021535] grind [vertices_cons, end_cons] [Elab.step] [0.021527] grind [vertices_cons, end_cons] Build completed successfully (521 jobs). ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	1/12	Mathlib/Combinatorics/Quiver/Path/Vertices.lean	1	1	['github-actions']	b-mehta assignee:b-mehta	7-21701 7 days ago	15-32825 15 days ago	15-32865 15 days
31132	kckennylau author:kckennylau	Feat(Algebra): saturation of a submonoid	This PR defines the saturation of a submonoid and the type of saturated submonoids. It is used for the context of localisations. Caveat: there is a similarly named predicate called `AddSubgroup.Saturated`. Zulip: * [mathlib4 > saturation of a submonoid](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/saturation.20of.20a.20submonoid/with/548242862) * [#Is there code for X? > Closure of Submonoid in CommMonoids](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Closure.20of.20Submonoid.20in.20CommMonoids/near/419087778) --- [![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/Group/Submonoid/Saturation.lean	2	11	['github-actions', 'kckennylau', 'plp127']	kim-em assignee:kim-em	6-21698 6 days ago	13-32891 13 days ago	13-32925 13 days
27258	JovanGerb author:JovanGerb	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	335/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	10	['JovanGerb', 'dwrensha', 'github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	5-29966 5 days ago	52-53795 1 month ago	52-55072 52 days
31464	Ljon4ik4 author:Ljon4ik4	improved R-linearity to A-linearity in the PushForward of Derivations	Let $A$ be an $R$-algebra for a commutative ring $R$ and $f:M\to N$ an $A$-module homomorphism. Given a derivation $D\in Der_R(A,M)$, we have a derivation $f \circ D$ of $Der_R(A,N)$. The induced map $Der_R(A,M)\to Der_R(A,N)$ is $A$-linear but was only reported to be $R$-linear in the previous implementation. All changes are in the PushForward section of the RingTheory/Derivation/Basic.lean file. The statements of definitions * `_root_.LinearMap.compDer` * `llcomp` * `_root_.LinearEquiv.compDer` are changed from $R$-linear to $A$-linear. For the stronger linearity the proof of `map_smul'` in `_root_.LinearMap.compDer` had to be changed. The rest remains as is. Edit: Some files explicitly used the weaker version, these have now been changed, by applying `.restrictScalars (R:=...)`, whereever the weaker linearity version of `compDer` was needed. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-ring-theory new-contributor	9/8	Mathlib/Geometry/Manifold/Algebra/LeftInvariantDerivation.lean,Mathlib/Geometry/Manifold/DerivationBundle.lean,Mathlib/RingTheory/Derivation/Basic.lean,Mathlib/RingTheory/Kaehler/Basic.lean	4	13	['Ljon4ik4', 'erdOne', 'github-actions', 'kckennylau']	nobody	2-49211 2 days ago	2-50196 2 days ago	3-66340 3 days
30895	callesonne author:callesonne	feat(Bicategory/Modification/Pseudo): define modifications between strong natural transformations of pseudofunctors	This PR adds modifications between strong natural transformations of pseudofunctors. At the same time, it improves the existing code on modifications between oplax natural tranformations of oplax functors (by removing some simp lemmas). This is a migration of #18254 to a fork. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	334/46	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	6	12	['callesonne', 'github-actions', 'joelriou', 'mathlib4-merge-conflict-bot', 'robin-carlier']	nobody	2-48560 2 days ago	2-68646 2 days ago	12-60742 12 days
31265	joelriou author:joelriou	feat(AlgebraicTopology): Edge and CompStruct for simplicial sets	The API for `2`-truncated simplicial sets #31254 is reproduced for simplicial sets. The definitions for simplicial sets are defeq to their `2`-truncated counterparts, but an effort is made to contain abuse of defeq... --- - [x] depends on: #31254 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-topology	187/1	Mathlib.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStruct.lean,Mathlib/AlgebraicTopology/SimplicialSet/CompStructTruncated.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	robin-carlier assignee:robin-carlier	1-21692 1 day ago	5-21084 5 days ago	5-21059 5 days
31590	SuccessMoses author:SuccessMoses	Add `simp` attr to `commutatorElement_def`	Add `simp` attribute to `commutatorElement_def` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	1/0	Mathlib/Algebra/Group/Commutator.lean	1	1	['github-actions']	nobody	0-65187 18 hours ago	0-65198 18 hours ago	0-65236 18 hours
27606	CBirkbeck author:CBirkbeck	Eisenstein q exp identity	--- - [x] depends on: #26016 - [x] depends on: #27212 - [x] depends on: #27837 - [x] depends on: #27839 - [x] depends on: #27840 - [x] depends on: #28690 - [x] depends on: #27838 - [x] depends on: #27841 - [x] depends on: #27844 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import awaiting-author	115/6	Mathlib/NumberTheory/ModularForms/EisensteinSeries/QExpansion.lean	1	30	['MichaelStollBayreuth', 'dagurtomas', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	dagurtomas assignee:dagurtomas	0-49420 13 hours ago	0-49420 13 hours ago	32-6406 32 days
31286	bryangingechen author:bryangingechen	ci: make new contributor labeling work for users with a private profile	The search API we switched to in #30859 returns an error when we try to filter for users with a private profile ([example log](https://github.com/leanprover-community/mathlib4/actions/runs/19093647472/job/54548944242?pr=31272)). We switch to searching for closed issues in the repo, which was working before. We then filter these for closed PRs whose titles start with `[Merged by bors] -`. We also include a slight optimization so that we don't have to page through all of a user's closed issues but stop when we find enough that count as merged PRs (>5 at the moment). written with help from Claude --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	41/16	.github/workflows/label_new_contributor.yml	1	8	['Ruben-VandeVelde', 'bryangingechen', 'github-actions']	robertylewis assignee:robertylewis	0-21700 6 hours ago	8-58591 8 days ago	8-58627 8 days
31465	bryangingechen author:bryangingechen	ci: Notify Zulip on update dependencies workflow failure	This adds a little bit more monitoring; would have caught the failures fixed by #31457 a little earlier.	CI	13/0	.github/workflows/update_dependencies.yml	1	1	['github-actions']	robertylewis assignee:robertylewis	0-21695 6 hours ago	3-66347 3 days ago	3-66380 3 days
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/)	file-removed t-linter merge-conflict	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	101-74770 3 months ago	101-74770 3 months ago	29-67280 29 days
28933	artie2000 author:artie2000	WIP chore(Data): correct definition for `single_apply`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	101/98	Counterexamples/DirectSumIsInternal.lean,Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/Group/Finsupp.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/InnerProductSpace/Projection/FiniteDimensional.lean,Mathlib/Combinatorics/Nullstellensatz.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/DFinsupp/Sigma.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/Finsupp/SMul.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Finsupp/ToDFinsupp.lean,Mathlib/LinearAlgebra/Basis/Basic.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/Basis/Prod.lean,Mathlib/LinearAlgebra/DFinsupp.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/FreeModule/Basic.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Multilinear/DFinsupp.lean,Mathlib/LinearAlgebra/StdBasis.lean,Mathlib/RingTheory/MvPolynomial/Groebner.lean	31	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	79-26524 2 months ago	79-26525 2 months ago	0-75271 20 hours
29574	JarodUW author:JarodUW	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/)	t-ring-theory new-contributor merge-conflict	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	60-12710 1 month ago	60-12711 1 month ago	3-7974 3 days
29605	alreadydone author:alreadydone	experiment(Algebra): unbundle npow/zpow from Monoid/InvDivMonoid	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict 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	59-52256 1 month ago	59-52257 1 month ago	0-2 2 seconds
30421	grunweg author:grunweg	WIP: support products in the differential geometry elaborators	Nothing to see yet. Best reviewed commit by commit. --- - [ ] depends on: #30413 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	1051/254	Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Lean/Meta/Basic.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean	4	4	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-74361 16 days ago	16-74363 16 days ago	0-2190 36 minutes
27918	kim-em author:kim-em	wip: 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	975/373	Mathlib.lean,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	57	16	['eric-wieser', 'github-actions', 'kim-em', 'mathlib4-merge-conflict-bot']	nobody	10-39948 10 days ago	10-39951 10 days ago	66-34137 66 days
30686	grunweg author:grunweg	tracking: #30658 split into pieces	--- - [x] depends on: #30685 - [x] depends on: #30687 - [x] depends on: #30688 - [x] depends on: #30689 - [x] depends on: #30762 (revert the other changes) - [x] depends on: #30691 - [x] depends on: #30778 Not meant for merging, but for me tracking the changes locally. This PR should never land directly. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict	2327/245	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Spectrum/Quasispectrum.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/GroupWithZero/Range.lean,Mathlib/Algebra/IsPrimePow.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Order/CauSeq/Basic.lean,Mathlib/Algebra/Order/Module/Defs.lean,Mathlib/Algebra/Polynomial/AlgebraMap.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/AlgebraicGeometry/AffineSpace.lean,Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplicialSet/StdSimplex.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/FaaDiBruno.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Topology.lean,Mathlib/Analysis/Normed/Unbundled/SmoothingSeminorm.lean,Mathlib/CategoryTheory/Abelian/Projective/Resolution.lean,Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean,Mathlib/CategoryTheory/Bicategory/EqToHom.lean,Mathlib/CategoryTheory/Category/Cat/Adjunction.lean,Mathlib/CategoryTheory/Category/Cat/Terminal.lean,Mathlib/CategoryTheory/Closed/Ideal.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Enriched/FunctorCategory.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean,Mathlib/CategoryTheory/Functor/KanExtension/Basic.lean,Mathlib/CategoryTheory/Grothendieck.lean,Mathlib/CategoryTheory/IsConnected.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean,Mathlib/CategoryTheory/Limits/Presheaf.lean,Mathlib/CategoryTheory/Limits/Shapes/BinaryProducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/Categorical/CatCospanTransform.lean,Mathlib/CategoryTheory/Limits/Shapes/Reflexive.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions.lean,Mathlib/CategoryTheory/Localization/Monoidal/Braided.lean,Mathlib/CategoryTheory/Monad/Adjunction.lean,Mathlib/CategoryTheory/Monad/Equalizer.lean,Mathlib/CategoryTheory/Monoidal/Action/Basic.lean,Mathlib/CategoryTheory/Monoidal/Action/End.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/ExternalProduct/Basic.lean,Mathlib/CategoryTheory/Monoidal/Opposite.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/CategoryTheory/Shift/Induced.lean,Mathlib/CategoryTheory/Sites/Coherent/SequentialLimit.lean,Mathlib/CategoryTheory/Sites/CoverLifting.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/CategoryTheory/Subpresheaf/Subobject.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Combinatorics/Matroid/Closure.lean,Mathlib/Combinatorics/Matroid/Rank/ENat.lean,Mathlib/Data/EReal/Operations.lean,Mathlib/Data/Fin/Fin2.lean,Mathlib/Data/Fin/Tuple/Curry.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/List/Lemmas.lean,Mathlib/Data/List/Sort.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Nat/Digits/Defs.lean,Mathlib/Data/Nat/MaxPowDiv.lean,Mathlib/Data/Nat/ModEq.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Num/Bitwise.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Basic.lean,Mathlib/Data/Seq/Computation.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Data/Vector/MapLemmas.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/LinearAlgebra/Alternating/Basic.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/Logic/Function/FromTypes.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/ModelTheory/Fraisse.lean,Mathlib/NumberTheory/Cyclotomic/PrimitiveRoots.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/Summable.lean	128	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-38923 8 days ago	8-38924 8 days ago	13-17060 13 days
31505	dsfxcimk author:dsfxcimk	Yulia	Add several theorems relating oriented angles and affine independence / collinearity, together with auxiliary lemmas about the equality and sign of oriented angles. Main additions `oangle_ne_zero_and_ne_pi_iff_not_collinear` – An oriented angle is neither `0` nor `π` if and only if the three points are not collinear. `affineIndependent_iff_of_oangle_eq` – If two oriented angles are equal, then the corresponding triples of points are affinely independent simultaneously. `not_collinear_iff_of_angle_eq` – If two oriented angles are equal, one triple is collinear if and only if the other is. `oangle_eq_or_eq_neg_of_angle_eq` – The oriented angles are equal or opposite if the unoriented angles are equal. `angle_eq_neg_of_two_zsmul_angle_eq` – If `2 • a = 2 • b` and the signs are opposite, then `a = b + π.` `two_zsmul_eq_iff_eq` – Characterizes equality of doubled angles when signs are equal. `oangle_sub_oangle_ne_pi_of_not_collinear` – If the signs of two oriented angles are equal and the points are not collinear, their difference is not `π`.	new-contributor t-euclidean-geometry merge-conflict awaiting-author	83/0	Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean	1	9	['jsm28']	nobody	2-65566 2 days ago	2-65629 2 days ago	0-50 50 seconds
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	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	0-55882 15 hours ago	0-69294 19 hours ago *	0-69268 19 hours *
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	54-67925 1 month ago	54-67925 1 month ago	0-2904 48 minutes
28718	imbrem author:imbrem	Added 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	new-contributor t-category-theory awaiting-author blocked-by-other-PR	290/0	Mathlib.lean,Mathlib/CategoryTheory/ChosenFiniteCoproducts.lean	2	8	['YaelDillies', 'github-actions', 'imbrem', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	41-81533 1 month ago	41-81534 1 month ago	0-24930 6 hours
30462	grunweg author:grunweg	Everything I wanted about immersions	Nothing to see yet, just for my own tracking (and for getting the cache). Ideally, this branch would become obsolete as all dependent PRs get merged :-) TODO: also cherry-pick the elaborators... --- - [ ] depends on: #28865 - [ ] depends on: #30413 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	1783/286	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.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/Geometry/Manifold/LocalSourceTargetProperty.lean,Mathlib/Geometry/Manifold/Notation.lean,Mathlib/Lean/Meta/Basic.lean,Mathlib/Topology/OpenPartialHomeomorph.lean,MathlibTest/DifferentialGeometry/Notation.lean,MathlibTest/DifferentialGeometry/NotationAdvanced.lean,docs/overview.yaml,docs/references.bib	16	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-74366 16 days ago	30-46342 30 days ago	0-2567 42 minutes
30926	callesonne author:callesonne	feat(Bicategory/Functorbicategory): define bicategory of pseudofunctors	This PR contains a definition of the bicategory of pseudofunctors, in the file `Bicategory/FunctorBicategory/Pseudo.lean`. It also moves the file `Bicategory/Functorbicategory.lean` to `Bicategory/FunctorBicategory/Oplax.lean`. This is a migration of #14089 to a fork. --- - [ ] depends on: #30895 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict blocked-by-other-PR	428/63	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean	7	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	8-38796 8 days ago	8-38797 8 days ago	0-1216 20 minutes
31339	grunweg author:grunweg	Movelemma	--- - [ ] depends on: #31338 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	415/78	Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/LocalFrame.lean,Mathlib/Geometry/Manifold/VectorBundle/MDifferentiable.lean,Mathlib/Topology/FiberBundle/Constructions.lean,Mathlib/Topology/FiberBundle/Trivialization.lean,Mathlib/Topology/VectorBundle/Basic.lean,Mathlib/Topology/VectorBundle/Constructions.lean,Mathlib/Topology/VectorBundle/Hom.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-21263 7 days ago	7-21263 7 days ago	0-1962 32 minutes
30920	callesonne author:callesonne	feat(Category/Grpd): define the bicategory of groupoids	This is a migration of #25561 to a fork. --- - [ ] depends on: #30132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	287/23	Mathlib/CategoryTheory/Bicategory/Functor/Strict.lean,Mathlib/CategoryTheory/Category/Grpd.lean	2	3	['Jlh18', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-44045 1 day ago	18-80127 18 days ago	0-117 1 minute
31492	fcoUnda author:fcoUnda	Nthroot improvement	Resolve TODO for nthroot, replacing the dependency on the arithmetic geometric mean inequality by some inequalities on powers of binomials. --- - [ ] depends on: #31502 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author blocked-by-other-PR	95/28	Mathlib/Analysis/SpecialFunctions/Pow/NthRootLemmas.lean	1	14	['fcoUnda', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	1-14376 1 day ago	2-41447 2 days ago	0-65326 18 hours

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
29530	ShreckYe author:ShreckYe	feat(Dynamics/PeriodicPts): some theorems for `Pi.map` in `Dynamics/PeriodicPts` analogous to those for `Prod.map`	Split from #29204. Some namespace prefixes are added in `GroupTheory/OrderOfElement.lean` to distinguish the extra imports introduced. - [ ] depends on: #29528	large-import	77/8	Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/GroupTheory/OrderOfElement.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	dupuisf assignee:dupuisf	56-21701 1 month ago	63-47534 2 months ago	63-48182 63 days
29400	ShreckYe author:ShreckYe	feat(`Algebra/BigOperators`): products of the results of insertion and removal on tuples and lists, and some needed lemmas		large-import	102/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Group/List/Basic.lean,Mathlib/Algebra/BigOperators/Group/List/Defs.lean,Mathlib/Algebra/BigOperators/Group/Vector/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean	6	6	['ShreckYe', 'bryangingechen', 'eric-wieser', 'github-actions']	bryangingechen assignee:bryangingechen	55-33545 1 month ago	67-69497 2 months ago	67-69536 67 days
30037	linesthatinterlace author:linesthatinterlace	feat: Fin.find update	We currently define `Fin.find` in a way that is redundant (in the sense that it is just equivalent to `Fin.find?` in batteries). This PR replaces it with a definition that works closer to `Nat.find`, and links the new definition of `Fin.find` to `Fin.find?` in the natural way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		159/104	Mathlib/Data/Fin/Tuple/Basic.lean	1	7	['github-actions', 'linesthatinterlace', 'llllvvuu', 'mathlib4-merge-conflict-bot']	adamtopaz assignee:adamtopaz	27-52112 27 days ago	45-48953 1 month ago	47-18454 47 days
29411	llllvvuu author:llllvvuu	feat(LinearAlgebra/Matrix/Rank): rank factorization	The rank factorization derived from `Module.finBasis`. Co-authored-by: Aristotle Harmonic --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	20/0	Mathlib/LinearAlgebra/Matrix/Rank.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean	2	2	['github-actions', 'jcommelin']	jcommelin assignee:jcommelin	20-62327 20 days ago	20-62327 20 days ago	46-58434 46 days
29960	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring): equalizers of pushout maps of tensor product inclusions	This PR defines a ring map `S →ₗ[R] S ⊗[R] S : s ↦ (s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)` for an `R`-algebra `S`, and show that its kernel is exactly (the image of) `R` if `S` is faithfully flat over `R`. Changes: * `TensorProduct.AlgebraTensorModule.distribBaseChange`: Origianlly takes `M` and `N`, where `M` is an `R`-module with an additional instance `IsScalarTower R A M`. This is unnecessary, so I changed the `M` and `N` into `N` and `Q`, now both of which are merely modules over `R`. Main results : * Add compatibility of `Algebra.TensorProduct.includeLeft` (or `Algebra.TensorProduct.includeRight`) with `TensorProduct.AlgebraTensorModule.distribBaseChange` and `LinearMap.lTensor` * Define `Algebra.TensorProduct.includeLeftSubRight`, which is the `R`-linear map `S →ₗ[R] S ⊗[R] S` sending `s : S` to `(s ⊗ₜ[R] 1) - (1 ⊗ₜ[R] s)`. * `Algebra.TensorProduct.exactIncludeLeftSubRight_of_faithfullyFlat`: the pair `algebraMap : R → S` and `includeLeftSubRight R S : S → S ⊗[R] S` is exact if `S` is a faithfully flat `R`-algebra. --- - [x] depends on: #30806	new-contributor	223/1	Mathlib.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	7	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'yonggyuchoimath']	TwoFX assignee:TwoFX	17-10624 17 days ago	17-13895 17 days ago	44-82270 44 days
30800	dagurtomas author:dagurtomas	feat(Condensed): cartesian monoidal functor LightProfinite -> LightCondSet	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	137/4	Mathlib.lean,Mathlib/Condensed/Light/Functors.lean,Mathlib/Topology/Category/CompHausLike/Cartesian.lean,Mathlib/Topology/Category/LightProfinite/Cartesian.lean	4	2	['dagurtomas', 'github-actions']	adamtopaz assignee:adamtopaz	15-21692 15 days ago	22-38981 22 days ago	22-39021 22 days
30322	kckennylau author:kckennylau	feat(RingTheory): base change of graded algebra	In this file we show that if `𝒜` is a graded `R`-algebra, and `S` is any `R`-algebra, then `S ⊗[R] 𝒜` (which is actually `fun i ↦ (𝒜 i).baseChange S`) is a graded `S`-algebra with the same grading. --- Split from #26061. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		272/47	Mathlib.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/DirectSum/Decomposition.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/Algebra/Order/Module/HahnEmbedding.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Decomposition.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/Flat/Basic.lean,Mathlib/RingTheory/Flat/FaithfullyFlat/Basic.lean,Mathlib/RingTheory/GradedAlgebra/TensorProduct.lean	12	2	['github-actions', 'mathlib4-merge-conflict-bot']	dupuisf assignee:dupuisf	12-80403 12 days ago	13-26595 13 days ago	35-38499 35 days
30363	smmercuri author:smmercuri	feat: `PadicInt` is isomorphic to the integers of the uniform space completion `(Rat.padicValuation p).Completion`	- Uniform and ring isomorphisms between `𝒪[(Rat.padicValuation p).Completion]` and `ℤ_[p]` - A homeomorphism `e : X ≃ Y` gives a closed set `{ x : X \| p x ↔ q (e x) }` for clopen subsets given by `p` and `q` - Move `Padic.isUnit_den` to an earlier file to avoid having to import `Padics.RingHoms` unnecessarily --- - [x] depends on: #30361 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		86/21	Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/NumberTheory/Padics/PadicIntegers.lean,Mathlib/NumberTheory/Padics/RingHoms.lean,Mathlib/NumberTheory/Padics/WithVal.lean,Mathlib/Topology/Homeomorph/Defs.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	dwrensha assignee:dwrensha	10-73862 10 days ago	35-51846 1 month ago	35-54377 35 days
30881	FlAmmmmING author:FlAmmmmING	feat(RingTheory/PowerSeries/Schroder.lean) : Define the generating function for large and small Schroder number	Define the generating function for large and small Schroder number. Main result : Prove some lemmas and the generating function of large Schroder. Todo : Prove the generating function of small Schroder. - depends on: #30609 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	350/1	Mathlib.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/RingTheory/PowerSeries/Schroder.lean	3	1	['github-actions']	dwrensha assignee:dwrensha	10-68346 10 days ago	19-69972 19 days ago	19-69958 19 days
31011	YuvalFilmus author:YuvalFilmus	feat: properties of Chebyshev polynomials over the reals	Added several properties of the Chebyshev polynomials: - Degrees of T_n, U_n - Leading coefficients of T_n, U_n - Evaluations ofT_n, U_n at the endpoints ±1 - T_n is bounded on [-1, 1], and vice versa - Zeroes of T_n and U_n, and extrema of T_n - Normalized T_n minimizes the maximum absolute value over [-1, 1] for monic polynomials --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor	989/5	Mathlib.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/RingTheory/Polynomial/Chebyshev.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Basic.lean,Mathlib/RingTheory/Polynomial/ChebyshevReal/Monic.lean	7	22	['Ruben-VandeVelde', 'YuvalFilmus', 'github-actions', 'plp127']	Vierkantor assignee:Vierkantor	9-21677 9 days ago	16-55372 16 days ago	16-55399 16 days
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	226/3	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	14	['adamtopaz', 'github-actions', 'robertmaxton42']	adamtopaz assignee:adamtopaz	9-9358 9 days ago	41-19216 1 month ago	56-15292 56 days
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/)	large-import new-contributor awaiting-author	70/3	Mathlib/Analysis/LocallyConvex/Separation.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/Topology/Order/OrderClosed.lean	3	15	['faenuccio', 'fpvandoorn', 'github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'mcdoll', 'themathqueen', 'yuanyi-350']	faenuccio assignee:faenuccio	6-26551 6 days ago	6-26588 6 days ago	21-29486 21 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/)		348/338	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	7	['JovanGerb', 'github-actions', 'jsm28']	robertylewis assignee:robertylewis	4-62649 4 days ago	20-65917 20 days ago	20-65890 20 days
30133	smmercuri author:smmercuri	feat: `WithVal v` and `WithVal w` are isomorphic as uniform spaces when `v` and `w` are equivalent valuations	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		97/0	Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Topology/Algebra/Valued/WithVal.lean	2	2	['github-actions', 'kbuzzard']	robin-carlier assignee:robin-carlier	3-21699 3 days ago	10-75570 10 days ago	14-49095 14 days
30570	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Connectivity/Connected): `reachabilitySet`	feat(Combinatorics/SimpleGraph/Connectivity/Connected): define `reachabilitySet` as the set of all pairs that have a walk between them --- The main motivation is making it easier to work with the bridge definition (see `isBridge_iff_mem_edgeSet_and_notMem_reachabilitySet_deleteEdges` and `mem_edgeSet_and_mem_reachabilitySet_deleteEdges_iff_exists_isCycle_and_mem_edges` at the bottom), although I think this set is worth defining regardless. - [x] depends on: #30542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		57/0	Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	1	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	kex-y assignee:kex-y	2-21699 2 days ago	6-47688 6 days ago	6-50198 6 days
31358	erdOne author:erdOne	feat(RingTheory): universal factorization map of polynomials	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		220/0	Mathlib.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/RingTheory/Polynomial/UniversalFactorizationRing.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	4	1	['github-actions']	dwrensha assignee:dwrensha	2-21676 2 days ago	6-65539 6 days ago	6-65513 6 days
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/)		162/0	Mathlib.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean	3	2	['github-actions', 'mathlib4-merge-conflict-bot']	nobody	1-67033 1 day ago	1-67053 1 day ago	8-82539 8 days
31548	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Analysis/Convex/Quasiconvex): properties of quasiconcave functions	Prove properties of quasiconcave/quasiconvex functions: * monotony * restriction * connectedness of preimages Co-authored with: @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	107/1	Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Data/Set/Basic.lean	2	1	['github-actions']	nobody	1-55730 1 day ago	1-65713 1 day ago	1-65747 1 day
31547	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Analysis/Convex/SaddlePoint): define saddle points of a map	* `IsSaddlePointOn`. Let `f : E × F → β` be a map, where `β` is preordered. A pair `(a,b)` in `E × F` is a saddle point of `f` on `X × Y` if `f a y ≤ f x b` for all `x ∈ X` and all `y `in Y`. * `isSaddlePointOn_iff`: if `β` is a complete linear order, then `(a, b) ∈ X × Y` is a saddle point on `X × Y` iff `⨆ y ∈ Y, f a y = ⨅ x ∈ X f x b = f a b`. Co-authored-by: @ADedecker --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import	228/0	Mathlib.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SaddlePoint.lean,Mathlib/Data/Set/Basic.lean	4	1	['github-actions']	nobody	1-55722 1 day ago	1-65816 1 day ago	1-65847 1 day
31046	Thmoas-Guan author:Thmoas-Guan	feat(Homology) : map between `Ext` induced by exact functor	In this PR, we developed the additive map `Ext(M,N) => Ext(F(M), F(N))` when `F` is exact functor between abelian category. We also developed its linear version when `F` is linear. Co-authored-by: Wang Jingting --- - [x] depends on: #31004 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		475/0	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-52930 1 day ago	1-65783 1 day ago	1-65812 1 day
30989	kckennylau author:kckennylau	feat(RingTheory): Teichmuller map	Let `R` be an `I`-adically complete ring, and `p` be a prime number with `p ∈ I`. This PR constructs the Teichmüller map `Perfection (R ⧸ I) p →₀ R` such that it composed with the quotient map `R →+ R ⧸ I` is the "0-th coefficient" map `Perfection (R ⧸ I) p →+* R ⧸ I`. This generalises the existing [PreTilt.untilt](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Perfectoid/Untilt.html#PreTilt.untilt). I have also moved `Mathlib/LinearAlgebra/SModEq` to a folder to be `/SModEq/Basic.lean`, because I needed to add some lemmas to `/SModEq/Prime.lean`; I also added a lemma to the end of `/Basic.lean` called `ideal`. --- In order to try to artificially minimise the diff count, I have made #30990 which only moves the file `SModEq`. - [x] depends on: #30990 - [x] depends on: #31193 - [x] depends on: #31195 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		206/112	Mathlib.lean,Mathlib/LinearAlgebra/SModEq/Basic.lean,Mathlib/LinearAlgebra/SModEq/Prime.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/Teichmuller.lean	6	24	['erdOne', 'github-actions', 'kbuzzard', 'kckennylau', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	1-33804 1 day ago	1-33822 1 day ago	11-10894 11 days
31007	kckennylau author:kckennylau	feat(RingTheory): generalise perfection to monoids	1. We generalise `PerfectRing` to monoids (without changing the name). 2. We move `Submonoid.perfection` and `Ring.Perfection` to the already existing `Perfection` namespace, which solves the problem that `Ring.Perfection` and its lemmas `Perfection.xxx` are in different namespaces. Also, the monoid perfection and right perfection have the same underlying set, so this unify the two approaches. 3. `Perfection.lift` is now generalised to monoids: `liftMonoidHom : (M →* N) ≃ (M →* Perfection N p)` where `M` is a perfect monoid. --- This is in preparation for a future PR following #30989. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		247/123	Mathlib/FieldTheory/Perfect.lean,Mathlib/FieldTheory/PerfectClosure.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean	4	32	['github-actions', 'jjdishere', 'kckennylau', 'mathlib4-merge-conflict-bot', 'pechersky']	nobody	1-33419 1 day ago	1-33440 1 day ago	11-25233 11 days
30851	FormulaRabbit81 author:FormulaRabbit81	feat(Topology): prove there exists an embedding of separable metric spaces in the hilbert cube	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #30849	file-removed	140/42	Mathlib.lean,Mathlib/Topology/Compactness/HilbertCubeEmbedding.lean,Mathlib/Topology/MetricSpace/PiNat.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	ADedecker assignee:ADedecker	1-21697 1 day ago	9-28761 9 days ago	9-49515 9 days
31305	kim-em author:kim-em	feat: grind golfing in Topology/Path	This is not as exhaustive as I would have liked; there's plenty more cleanup to do here. But I need to pause on this for now and I think it's an improvement.		61/91	Mathlib/Algebra/Order/Interval/Set/Instances.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	5	3	['github-actions', 'grunweg']	j-loreaux assignee:j-loreaux	1-21689 1 day ago	8-33148 8 days ago	8-33122 8 days
31449	kim-em author:kim-em	feat(SemilocallySimplyConnected): definition and alternative formulation			112/0	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/SemilocallySimplyConnected.lean,Mathlib/Topology/Path.lean	3	2	['ADedecker', 'github-actions']	jcommelin assignee:jcommelin	1-21675 1 day ago	4-28332 4 days ago	4-28306 4 days
31161	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPolynomial/IrrQuadratic): irreducibility of sum X_i Y_i	For $n\geq 2$, the polynomial $$\sum_{i=1}^n X_i Y_i$$ is irreducible. This was used in the initial proof that the transvections have determinant 1. Now, a more general result is proved there and this PR is no more needed. I believe that it remains of independent interest (irreducibility of quadrics in algebraic geometry) but the maintainers might want that the general one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		230/0	Mathlib.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/RingTheory/MvPolynomial/IrrQuadratic.lean,Mathlib/RingTheory/MvPolynomial/MonomialOrder/DegLex.lean	4	7	['AntoineChambert-Loir', 'github-actions', 'joelriou']	joelriou assignee:joelriou	0-33662 9 hours ago	0-61996 17 hours ago	11-49082 11 days
28026	kim-em author:kim-em	feat: grind annotations for `Disjoint`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-author	76/56	Archive/Imo/Imo2001Q3.lean,Mathlib/Data/Finset/Disjoint.lean,Mathlib/Data/Set/Disjoint.lean,Mathlib/Order/BooleanAlgebra/Basic.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/BoundedOrder/Lattice.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/Order/Disjoint.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/SupIndep.lean,MathlibTest/grind/pairwise_disjoint.lean	11	33	['chrisflav', 'euprunin', 'github-actions', 'grunweg', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-merge-conflict-bot']	alexjbest assignee:alexjbest	0-4976 1 hour ago	0-4999 1 hour ago	48-60022 48 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/)	tech debt merge-conflict awaiting-author	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	172-60891 5 months ago	172-60893 5 months ago	34-33204 34 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	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	36-76065 1 month ago	36-76066 1 month ago	25-78230 25 days
29241	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Orthogonal): add duplicates for `ClosedSubmodule`	add duplicates of definitions and API's for `ClosedSubmodule` in an `InnerProductSpace`. motivation: when one considers a Hilbert space (`CompleteSpace`), it is more natural to consider `ClosedSubmodule`s. They form a complete lattice and satisfy `sup_orthogonal` #29243. - [x] depends on: #29230 for `Lattice` `CompleteLattice`	merge-conflict awaiting-author	191/0	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean	1	8	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot', 'sgouezel', 'yoh-tanimoto']	sgouezel assignee:sgouezel	36-60797 1 month ago	36-60798 1 month ago	12-74361 12 days
29076	yury-harmonic author:yury-harmonic	feat(BigOperators/ModEq): new file	--- - [ ] depends on: #29072 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	337/26	Mathlib.lean,Mathlib/Algebra/BigOperators/ModEq.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Data/Nat/ModEq.lean	4	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-587 9 days ago	9-588 9 days ago	0-4560 1 hour
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.) --- TODO: move two helper results about embeddings to their proper place; perhaps even PR separately - [ ] depends on: #28793 - [ ] depends on: #28796 - [ ] depends on: #28853 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	792/7	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/ContMDiff/Atlas.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	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	66-34781 2 months ago	66-34782 2 months ago	0-617 10 minutes
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	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	66-34780 2 months ago	66-34780 2 months ago	0-309 5 minutes
29243	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/Projection/Submodule): add `sup_orthogonal` for `ClosedSubmodules`	prove that the closed submodule generated by the orthogonal complements of two submodules is the orthogonal complement of the intersection. motivation: needed to define standard subspaces in a Hilbert space #29251 https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal`	merge-conflict blocked-by-other-PR	354/1	Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	62-49854 2 months ago	62-49854 2 months ago	0-2553 42 minutes
29251	yoh-tanimoto author:yoh-tanimoto	feat(Analysis/InnerProductSpace/): define standard subspaces of a complex Hilbert space	define standard subspaces of a complex Hilbert space: a standard subspace `S` of `H` is a closed real subspace `S` such that `S ⊓ i S = ⊥` and `S ⊔ i S = ⊤`. prove that the symplectic complement of `S` is again a standard subspace and the double symplectic complement is itself. motivation: one can define a closable operator `x + i y ↦ x - i y` and develop an analogue of the Tomita-Takesaki modular theory for von Neumann algebras. By considering inclusions of standard subspaces, one can obtain unitary representations of various Lie groups. https://ems.press/content/serial-article-files/48171 - [ ] depends on: #29230 for `Lattice` `CompleteLattice` - [ ] depends on: #29241 for the definition of `orthogonal` - [ ] depends on: #29243 for `sup_orthogonal` - [ ] depends on: #29235 for `mapEquiv`	merge-conflict blocked-by-other-PR	699/2	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/Orthogonal.lean,Mathlib/Analysis/InnerProductSpace/Projection/Submodule.lean,Mathlib/Analysis/InnerProductSpace/StandardSubspace.lean,Mathlib/Topology/Algebra/Module/ClosedSubmodule.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	62-49731 2 months ago	62-49732 2 months ago	0-3098 51 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/)	large-import blocked-by-other-PR	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	56-17324 1 month ago	56-18692 1 month ago	0-4627 1 hour
29274	Jlh18 author:Jlh18	feat(CategoryTheory): HasLimits instance on Grpd	- Show that the quotient of a groupoid is a groupoid in `CategoryTheory.Quotient`. - Define the free groupoid on a category in `CategoryTheory.Category.FreeGroupoid` and hence define the free-forgetful adjunction between `Grpd` and `Cat`. - 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] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor blocked-by-other-PR	246/1	Mathlib.lean,Mathlib/CategoryTheory/Category/FreeGroupoid.lean,Mathlib/CategoryTheory/Category/Grpd.lean,Mathlib/CategoryTheory/Groupoid/Grpd/Limit.lean,Mathlib/CategoryTheory/Quotient.lean	5	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	45-70927 1 month ago	45-70935 1 month ago	0-340 5 minutes
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/)	large-import blocked-by-other-PR	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	3	['github-actions', 'mathlib4-dependent-issues-bot', 'scholzhannah']	nobody	44-63934 1 month ago	56-21269 1 month ago	0-1375 22 minutes
30365	kckennylau author:kckennylau	feat(RingTheory): define R-linear graded algebra homomorphism	This PR defines R-linear graded algebra homomorphisms, which are R-algebra homomorphisms that preserve the grading. We also provide the basic properties (aka the "API"). Zulip discussion: [#mathlib4 > redefine Graded Algebra](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/redefine.20Graded.20Algebra/near/543847326) --- Split from #26061. - [ ] depends on: #30355 - [ ] depends on: #30312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	642/0	Mathlib.lean,Mathlib/Data/FunLike/GradedFunLike.lean,Mathlib/RingTheory/GradedAlgebra/AlgHom.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-66465 1 month ago	35-69362 1 month ago	0-578 9 minutes
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. - [ ] depends on: #30355 - [ ] depends on: #30312 - [ ] depends on: #30367 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	825/0	Mathlib.lean,Mathlib/Data/FunLike/Graded.lean,Mathlib/RingTheory/GradedAlgebra/RingEquiv.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-28858 1 month ago	35-48501 1 month ago	0-3140 52 minutes
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/)	new-contributor merge-conflict blocked-by-other-PR	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	34-55271 1 month ago	57-71684 1 month ago	0-396 6 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	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	24-37477 24 days ago	29-60549 29 days ago	4-45292 4 days
30204	yonggyuchoimath author:yonggyuchoimath	feat(Algebra/Category/Ring/EqualizerPushout): add effectiveEpi_of_faithfullyFlat in CommRingCatᵒᵖ	This PR proves that any map `f : S ⟶ R` in `CommRingCatᵒᵖ` with faithfully flat `f.unop : R.unop ⟶ S.unop` is an effective epimorphism. Main results: - `CommRingCat.Equalizer.isLimitForkPushoutSelfOfFaithfullyFlat` : If `f : R ⟶ S` is a faithfully flat map in `CommRingCat`, then `Fork.ofι f pushout.condition` is an equalizer diagram. - `CommRingCat.Opposite.effectiveEpi_of_faithfullyFlat` : Any map `f : S ⟶ R` in `CommRingCatᵒᵖ` with faithfully flat `f.unop : R.unop ⟶ S.unop` is an effective epimorphism. --- - [ ] depends on: #29960 - [x] depends on: #30200	blocked-by-other-PR	400/1	Mathlib.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	17-10528 17 days ago	17-10546 17 days ago	0-1375 22 minutes
30399	kckennylau author:kckennylau	feat(RingTheory): make HomogeneousLocalization.map take a graded ring hom	and also make `Away.map`. --- - [ ] depends on: #30302 - [ ] depends on: #30312 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	526/133	Mathlib.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Basic.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Proper.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/StructureSheaf.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean,Mathlib/Data/FunLike/GradedFunLike.lean,Mathlib/RingTheory/GradedAlgebra/FiniteType.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/GradedAlgebra/RingHom.lean	11	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-53146 16 days ago	16-53148 16 days ago	0-356 5 minutes
31019	vihdzp author:vihdzp	feat: colex order on finsupps	--- - [ ] depends on: #30482 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	201/20	Mathlib/Algebra/Order/Group/Synonym.lean,Mathlib/Data/DFinsupp/Lex.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Order/PiLex.lean,Mathlib/Order/Synonym.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	16-50849 16 days ago	16-51097 16 days ago	0-571 9 minutes
30766	dagurtomas author:dagurtomas	feat(CategoryTheory): transport closed monoidal structure along equivalence	--- - [ ] depends on: #30771 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	file-removed blocked-by-other-PR	59/36	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Closed.lean,Mathlib/AlgebraicTopology/SimplicialSet/Monoidal.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Category/Cat/CartesianClosed.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Limits/Sifted.lean,Mathlib/CategoryTheory/Monoidal/Braided/Reflection.lean,Mathlib/CategoryTheory/Monoidal/Closed/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Closed/Enrichment.lean,Mathlib/CategoryTheory/Monoidal/Closed/Functor.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Basic.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Complete.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorCategory/Groupoid.lean,Mathlib/CategoryTheory/Monoidal/Closed/FunctorToTypes.lean,Mathlib/CategoryTheory/Monoidal/Closed/Ideal.lean,Mathlib/CategoryTheory/Monoidal/Closed/Transport.lean,Mathlib/CategoryTheory/Monoidal/Closed/Types.lean,Mathlib/CategoryTheory/Monoidal/Closed/Zero.lean,Mathlib/CategoryTheory/Monoidal/DayConvolution/Closed.lean,Mathlib/CategoryTheory/Monoidal/Rigid/Basic.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/Preadditive/Projective/Internal.lean,Mathlib/CategoryTheory/Sites/CartesianClosed.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/CartesianClosed.lean,Mathlib/Condensed/Light/CartesianClosed.lean	28	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	16-4776 16 days ago	16-4805 16 days ago	0-27 27 seconds
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: #30328 - [ ] depends on: #30327 - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] depends on: #30239 - [ ] depends on: #30236 - [ ] depends on: #30202 - [ ] depends on: #30201 - [ ] depends on: #30199 - [ ] 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	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	15-77940 15 days ago	33-39353 1 month ago *	0-1767 29 minutes *
30328	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): the inclusion of test functions into bounded continuous functions as a continuous linear map	--- - [ ] depends on: #30327 - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	815/5	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	15-77939 15 days ago	27-45416 27 days ago	0-1917 31 minutes
30327	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): add characterizations of continuity for linear maps on test functions	--- - [ ] depends on: #30325 - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	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	15-77937 15 days ago	27-45418 27 days ago	0-64 1 minute
30325	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): Endow test functions with the canonical LF topology	--- - [ ] depends on: #30309 - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] 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	730/5	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	15-77936 15 days ago	27-45420 27 days ago	0-2560 42 minutes
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	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	15-77930 15 days ago	27-45423 27 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 --- - [ ] 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	454/3	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	15-77929 15 days ago	27-45425 27 days ago	0-599 9 minutes
30240	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add a wrapper for fderiv on D_K^n	Add a wrapper for `fderiv` as a map from `D_K^n` to `D_K^(n-1)`. Co-Authored by: @ADedecker --- - [ ] 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	406/3	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	15-77926 15 days ago	27-45428 27 days ago	0-546 9 minutes
30239	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/ContDiffMapSupportedIn): Add characterization of continuity for maps into D_K^n, continuity of inclusion into C_b	Add a characterization of continuity for maps into D_K^n, and continuity of the inclusion of D_K^n into C_b. Co-Authored by: @ADedecker --- - [ ] 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	310/3	Mathlib/Analysis/Distribution/ContDiffMapSupportedIn.lean,Mathlib/Data/Set/Function.lean	2	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-77925 15 days ago	27-45429 27 days ago	0-512 8 minutes
29942	smmercuri author:smmercuri	feat(InfinitePlace/Completion): embeddings of `w.Completion` factor through embeddings of `v.Completion` when `w` extends `v`	If `w : v.Extension L` is an extension of `v : InfinitePlace K` to `L`, then `extensionEmbedding w : L →+* ℂ` factors through `extensionEmbedding v : K →+* ℂ`. --- - [x] depends on: #27978 - [ ] depends on: #29969 - [x] depends on: #29944 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT merge-conflict blocked-by-other-PR	207/60	Mathlib/Analysis/Normed/Field/WithAbs.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Completion.lean,Mathlib/NumberTheory/NumberField/InfinitePlace/Ramification.lean,Mathlib/Topology/MetricSpace/Completion.lean	5	5	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	15-39460 15 days ago	15-56910 15 days ago	0-1122 18 minutes
29948	mcdoll author:mcdoll	feat(Analysis/Fourier): the Fourier transform on L^2	--- - [x] depends on: #29888 - [x] depends on: #29860 - [ ] depends on: #31074 - [ ] depends on: #31076 - [ ] depends on: #31079 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	505/92	Mathlib.lean,Mathlib/Analysis/Distribution/FourierSchwartz.lean,Mathlib/Analysis/Fourier/L2Space.lean,Mathlib/Analysis/InnerProductSpace/Extend.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/Completeness.lean,Mathlib/Analysis/Normed/Operator/Extend.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	14-67036 14 days ago	14-68743 14 days ago	0-2667 44 minutes
30811	yonggyuchoimath author:yonggyuchoimath	feat(AlgebraicGeometry.EffectiveEpi): effective epimorphisms in schemes	We prove the following: * `AffineScheme.effectiveEpiOfFlatOfSurjective`: A flat surjective morphism (between affine schemes) is an effective epimorphism in the category of affine schemes. * `descSpecOfFlatOfSurjective`: Given a morphism `e : Spec S ⟶ U` of schemes which coequalizes the two projections `(Spec S) ×[Spec R] (Spec S) ⟶ Spec S`, this constructs a unique morphism `Spec R ⟶ U` of schemes that `e` factors through. * `effectiveEpi_Spec_of_flat_of_surjective`: If `f : R ⟶ S` is a flat ring map in `CommRingCat` with surjective `Spec.map f : Spec S ⟶ Spec R`, then `Spec.map f : Spec S ⟶ Spec R` is an effective epimorphism in the category of schemes. --- - [x] depends on: #30237 - [ ] depends on: #30204 Note: I've again incorporated `Scheme.isAffine_local_affine`, an instance saying that any `Scheme.local_affine` at a point gives an affine scheme, in order to define `coverR` in line 259. As already noted in [this review](https://github.com/leanprover-community/mathlib4/pull/30034#pullrequestreview-3277376677) of #30034, having `Scheme.local_affine` in statements is not desirable as any such statements should be true for any open affine neightborhoods. In fact, it is possible to define `coverR` (and prove the rest) without invoking this instance, e.g., using [`exists_isAffineOpen_mem_and_subset`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/AlgebraicGeometry/AffineScheme.html#AlgebraicGeometry.exists_isAffineOpen_mem_and_subset). A problem of this approach is that `IsAffine` is not automatically synthesized (even if I add an `IsAffine` instance for `exists_isAffineOpen_mem_and_subset`) because `hxU : x ∈ U` can't be synthesized automatically, and this forced to explicitly write down the proof of `IsAffine` everytime. That's the reason that I included `Scheme.isAffine_local_affine` in this PR. I would appreciate any suggestions on this. Another note: I've marked many definitions and lemmas with `private`. My criterion was the following: - It is not optimal as it is stated and can be enhanced after proving `effectiveEpi_Spec_of_flat_of_surjective`: `base_factorization` in line 102 (as it should be true for quasi-compact coverings that are flat surjective). - The definition/lemma seems specific to the proof of `descSpecOfFlatOfSurjective`. Even when proving fpqc morphisms of algebraic spaces are effective epimorphisms, we would only need `descSpecOfFlatOfSurjective` and lemmas about it (but not the things like `e'_coeq_pullback_f'` or `desc'_cocycle_condition`), cf. [Stacks project, Tag 04P2](https://stacks.math.columbia.edu/tag/04P2).	merge-conflict blocked-by-other-PR	780/1	Mathlib.lean,Mathlib/Algebra/Category/Ring/EqualizerPushout.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/EffectiveEpi.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/IncludeLeftSubRight.lean,Mathlib/RingTheory/TensorProduct/Maps.lean	7	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	13-72953 13 days ago	13-72954 13 days ago	0-2336 38 minutes
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`. --- - [ ] depends on: #31132 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	293/0	Mathlib.lean,Mathlib/Algebra/Group/Submonoid/Saturation.lean,Mathlib/RingTheory/Localization/Saturation.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-27689 13 days ago	13-27690 13 days ago	0-169 2 minutes
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 merge-conflict blocked-by-other-PR	770/4	Mathlib.lean,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	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	10-53529 10 days ago	10-53530 10 days ago	0-1197 19 minutes
30927	callesonne author:callesonne	feat(Bicategory/Yoneda): add the yoneda pseudofunctor	--- - [ ] depends on: #30926 - [ ] depends on: #30895 - [ ] depends on: #25901 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-other-PR	759/91	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Basic.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Oplax.lean,Mathlib/CategoryTheory/Bicategory/FunctorBicategory/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/Modification/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/Opposites.lean,Mathlib/CategoryTheory/Bicategory/Yoneda.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Opposites.lean,Mathlib/Data/Opposite.lean	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	9-62810 9 days ago	unknown	unknown
31162	AntoineChambert-Loir author:AntoineChambert-Loir	feat(LinearAlgebra/Dual/BaseChange): base change of a linear form (on the Module.Dual)	Base change map for `Module.Dual`. --- - [ ] depends on: #31240 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	607/6	Mathlib.lean,Mathlib/Algebra/DirectSum/Module.lean,Mathlib/LinearAlgebra/Basis/Defs.lean,Mathlib/LinearAlgebra/DirectSum/TensorProduct.lean,Mathlib/LinearAlgebra/Dual/BaseChange.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeFree.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangeHom.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-54428 8 days ago	9-80757 9 days ago	2-19540 2 days
30640	SnirBroshi author:SnirBroshi	feat(Combinatorics/SimpleGraph/Acyclic): a maximally acyclic graph is a tree	Prove that a graph is maximally acyclic iff it is a tree, plus helpful theorems about bridges and acyclicity. --- - [ ] depends on: #30570 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	118/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Connected.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	6-47029 6 days ago	6-47051 6 days ago	0-627 10 minutes
31500	zcyemi author:zcyemi	feat(Analysis/Convex/Between): add lemmas on affine independence under strict betweenness	--- Add lemmas showing that affine independence is preserved when replacing a vertex by a point strictly between two others, and related results for triangles. deps: - [ ] depends on: #31498 - [ ] depends on: #31499	blocked-by-other-PR	101/0	Mathlib/Analysis/Convex/Between.lean,Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'zcyemi']	nobody	3-4854 3 days ago	3-5216 3 days ago	0-117 1 minute
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/)	large-import blocked-by-other-PR	3001/57	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/CategoryTheory/Shift/ShiftedHom.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/KrullDimension/Module.lean,Mathlib/RingTheory/KrullDimension/Regular.lean,Mathlib/RingTheory/LocalRing/MaximalIdeal/Basic.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean,Mathlib/RingTheory/RegularLocalRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/Defs.lean,Mathlib/RingTheory/Support.lean	23	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-69054 1 day ago	32-41898 1 month 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/)	large-import blocked-by-other-PR	3196/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	13	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68873 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	3456/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean	14	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68525 1 day ago	unknown	unknown
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: #29670 - [ ] depends on: #29534 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	3909/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean,Mathlib/RingTheory/RegularLocalRing/GlobalDimension.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/Basic.lean,Mathlib/RingTheory/RegularLocalRing/RegularRing/GlobalDimension.lean	16	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68433 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	4156/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.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	18	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-68010 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	2858/10	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.lean	12	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-67829 1 day ago	unknown	unknown
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/)	large-import blocked-by-other-PR	4709/30	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/CohenMacaulay/Maximal.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.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/Defs.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	19	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	1-67723 1 day ago	unknown	unknown
30309	luigi-massacci author:luigi-massacci	feat(Analysis/Distribution/TestFunction): Add module instance to TestFunction	Add module instance to TestFunction --- - [ ] depends on: #30278 - [ ] depends on: #30255 - [ ] depends on: #30253 - [ ] depends on: #30240 - [ ] depends on: #30239 - [ ] depends on: #30236 - [ ] depends on: #30202 - [ ] 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	691/5	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	1-64354 1 day ago	27-45421 27 days ago	0-2572 42 minutes
31567	EtienneC30 author:EtienneC30	feat: characteristic function of a Gaussian measure	--- - [ ] depends on: #31565 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	32/0	Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean,Mathlib/Probability/Distributions/Gaussian/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-33361 1 day ago	1-33362 1 day ago	0-245 4 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/)	large-import new-contributor merge-conflict blocked-by-other-PR	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	1-13747 1 day ago	1-13748 1 day ago	0-241 4 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/)	large-import new-contributor merge-conflict blocked-by-other-PR	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	1-13746 1 day ago	1-13747 1 day ago	0-1234 20 minutes
31565	EtienneC30 author:EtienneC30	feat: characteristic function equals dual characteristic function	--- - [ ] depends on: #31563 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	14/0	Mathlib/Analysis/InnerProductSpace/Dual.lean,Mathlib/MeasureTheory/Measure/CharacteristicFunction.lean	2	4	['EtienneC30', 'github-actions', 'mathlib4-dependent-issues-bot', 'themathqueen']	nobody	0-76109 21 hours ago	1-33361 1 day ago	0-971 16 minutes
30931	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory): Gorenstein local ring	In this PR, we give the definition of Gorenstein local ring. --- - [ ] depends on: #30532 - [ ] depends on: #26218 - [ ] depends on: #29670 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	4968/35	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/Algebra/Homology/DerivedCategory/ExactFunctor.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/BaseChange.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Map.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LeftExact.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/CohenMacaulay/Basic.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean,Mathlib/RingTheory/GlobalDimension.lean,Mathlib/RingTheory/Gorenstein/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Localization.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/Ischebeck.lean	23	n/a	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-60421 16 hours ago	unknown	unknown
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. However, this result does not seem to be known to Mathlib. * 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 --- - [ ] depends on: #31548 - [ ] depends on: #31547 - [ ] depends on: #31558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR	1371/1	Mathlib.lean,Mathlib/Analysis/Convex/Quasiconvex.lean,Mathlib/Analysis/Convex/SaddlePoint.lean,Mathlib/Data/EReal/Basic.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Topology/Compactness/Compact.lean,Mathlib/Topology/Semicontinuous.lean,Mathlib/Topology/Sion.lean,Mathlib/Topology/Sublevel.lean,docs/references.bib	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-60390 16 hours ago	1-48450 1 day ago	0-536 8 minutes
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 --- - [ ] depends on: #31218 - [ ] depends on: #31219 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	267/5	Mathlib.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/LeftExact.lean,Mathlib/RingTheory/Flat/IsBaseChange.lean	8	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-56134 15 hours ago	0-56135 15 hours ago	0-266 4 minutes
31368	dagurtomas author:dagurtomas	feat(Condensed): characterize internal projectivity	--- - [ ] depends on: #30800 - [ ] depends on: #25797 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict blocked-by-other-PR	580/12	Mathlib.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Localization/Monoidal/Basic.lean,Mathlib/CategoryTheory/Monoidal/FunctorCategory.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/Condensed/Light/Functors.lean,Mathlib/Condensed/Light/InternallyProjective.lean,Mathlib/Condensed/Light/Monoidal.lean,Mathlib/Topology/Category/CompHausLike/Cartesian.lean,Mathlib/Topology/Category/LightProfinite/Cartesian.lean	10	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-56008 15 hours ago	0-56009 15 hours ago	0-837 13 minutes
31059	gasparattila author:gasparattila	feat(Topology/Sets): define the Vietoris topology on `(Nonempty)Compacts`	This PR defines the Vietoris topology on `Compacts` and `NonemptyCompacts`, and proves that it is induced by the Hausdorff uniformity. --- - [ ] depends on: #31031 - [x] depends on: #31058 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR	448/32	Mathlib.lean,Mathlib/Data/Rel.lean,Mathlib/Topology/MetricSpace/Closeds.lean,Mathlib/Topology/Order.lean,Mathlib/Topology/Sets/Compacts.lean,Mathlib/Topology/UniformSpace/Closeds.lean	6	3	['github-actions', 'mathlib4-dependent-issues-bot', 'mathlib4-merge-conflict-bot']	nobody	0-40476 11 hours ago	8-59697 8 days ago	0-3475 57 minutes

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