Mathlib triage dashboard

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

This dashboard was last updated on: April 19, 2025 at 08:12 UTC

Overall statistics

Found 1453 open PRs overall. Among these PRs

304 (20.9%) are awaiting review (these ones), among these 43 (14.2%) by new contributors (these ones)
256 (17.6%) are blocked on another PR
97 (6.7%) are awaiting the PR author's action
181 (12.5%) have a merge conflict: among these, 61 (33.7%) would be ready for review otherwise: these
37 (2.5%) are labelled help-wanted or please-adopt (roughly these)
553 (38.1%) are marked as draft or work in progress
5 (0.3%) are awaiting the outcome of a zulip discussion (these ones)
4 (0.3%) are opened from a fork of mathlib (these ones)
0 (0.0%) have contradictory labels (these ones)
11 (0.8%) are delegated (stale ones are here)
5 (0.3%) have been sent to bors (stale ones are here)

Approved, not yet landed PRs

At the moment,

5 PRs are ready to merge: 1 of them are stale, and merit another look

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
23988	RemyDegenne author:RemyDegenne	feat(MeasureTheory): `tendsto_iff_forall_integral_rclike_tendsto`	Add variants of `tendsto_iff_forall_integral_tendsto` for finite measures and probability measures, where the integral is over functions with value in an RCLike type instead of Real. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability ready-to-merge	52/0	Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean	4	2	['github-actions', 'sgouezel']	nobody	1-79176 1 day ago	1-79881 1 day ago	4-9076 4 days

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

15 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
19633	grunweg author:grunweg	fix(CI): build the Archive and Counterexamples with --wfail also	This appears to be an oversight --- which has no consequences right now (the check for noisy output later would catch any warnings), but fixing it doesn't hurt either. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/No.20.60--wfail.60.20when.20building.20archive). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI awaiting-CI easy delegated	20/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	5	['adomani', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors']	nobody	130-22791 4 months ago	130-22791 4 months ago	7-42070 7 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 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	15	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	98-57583 3 months ago	98-57583 3 months ago	34-82472 34 days
21265	ADedecker author:ADedecker	feat: some lemmas about pointwise actions of units on filters and uniformities	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology delegated label:t-algebra$	45/0	Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	2	7	['github-actions', 'mathlib-bors', 'ocfnash']	nobody	63-41112 2 months ago	63-41112 2 months ago	15-25642 15 days
23240	urkud author:urkud	feat(Topology/Maps): `IsOpenMap` and `ClusterPt`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	17/4	Mathlib/Topology/Maps/Basic.lean	1	6	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	26-26311 26 days ago	26-33390 26 days ago	0-12104 3 hours
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 delegated	119/3	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	12	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	14-71075 14 days ago	35-61300 1 month ago	15-14325 15 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 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	24	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em']	nobody	8-83071 8 days ago	12-4837 12 days ago	82-54712 82 days
22959	ScottCarnahan author:ScottCarnahan	chore (RingTheory/HahnSeries/SummableFamily): refactor HahnSeries.SummableFamily.powers to take junk values	This PR removes the positive order condition on the function `HahnSeries.SummableFamily.powers`, and instead takes the junk value zero when the input has non-positive order. This follows a reviewer suggestion from #20205. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	169/93	Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	2	3	['github-actions', 'jcommelin', 'mathlib-bors']	nobody	6-40727 6 days ago	18-69985 18 days ago	15-77138 15 days
24078	jcommelin author:jcommelin	chore(LinearAlgebra): golf two proofs and remove porting notes	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	62/89	Mathlib/LinearAlgebra/Dimension/DivisionRing.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean	2	6	['b-mehta', 'github-actions', 'grunweg', 'mathlib-bors', 'riccardobrasca']	nobody	3-59636 3 days ago	3-61645 3 days ago	0-10728 2 hours
24074	ooovi author:ooovi	chore(Probability/Distributions): remove `open Classical ...` from `toMeasure_uniformOfFintype_apply`	Remove `open scoped Classical in` in front of the `toOuterMeasure_uniformOfFintype_apply` and `toMeasure_uniformOfFintype_apply` theorems --- I encountered a hard-to-debug error due to this, leading to the implicit use of the classical `Finset s` instance in the theorem statement, see [the zulip thread](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/coercing.20between.20types.20with.20different.20instances). I hear the removal of the use of the `Classical` namespace for theorem statements is an ongoing project, so feel free to either tell me to remove more occurances e.g. in this file, or defer this PR in favour of the ongoing project.	t-measure-probability delegated	7/7	Mathlib/Probability/Distributions/Uniform.lean	1	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ooovi']	nobody	2-80983 2 days ago	3-31193 3 days ago	0-47844 13 hours
23549	bryangingechen author:bryangingechen	chore: make dependabot group updates into a single PR	cf. docs at https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/optimizing-pr-creation-version-updates --- It was a bit annoying to make a single bors batch for [#23544](https://github.com/leanprover-community/mathlib4/pull/23544) [#23543](https://github.com/leanprover-community/mathlib4/pull/23543) [#23541](https://github.com/leanprover-community/mathlib4/pull/23541) [#23540](https://github.com/leanprover-community/mathlib4/pull/23540).	CI delegated	10/0	.github/dependabot.yml	1	5	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	nobody	1-36849 1 day ago	1-36849 1 day ago	16-27325 16 days
22163	kebekus author:kebekus	feat: canonical tensors in inner product spaces	Given an `InnerProductSpace ℝ E`, this file defines two canonical tensors. * `InnerProductSpace.canonicalContravariantTensor E : E ⊗[ℝ] E →ₗ[ℝ] ℝ`. This is the element corresponding to the inner product. * If `E` is finite-dimensional, then `E ⊗[ℝ] E` is canonically isomorphic to its dual. Accordingly, there exists an element `InnerProductSpace.canonicalCovariantTensor E : E ⊗[ℝ] E` corresponding to `InnerProductSpace.canonicalContravariantTensor E` under this identification. 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 canonical tensors are useful for defining the Laplace operator on inner product spaces in a coordinate-free way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis delegated	63/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/CanonicalTensor.lean	2	10	['adomani', 'github-actions', 'kebekus', 'loefflerd', 'mathlib-bors', 'sgouezel']	nobody	1-5039 1 day ago	1-60170 1 day ago	55-5556 55 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	194-77494 6 months ago	197-14570 6 months ago	20-15089 20 days
21761	JovanGerb author:JovanGerb	feat(Algebra): add lemmas `mul_self` and `add_self`	This is point (4) in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Possible.20improvements.20to.20Lean.2FMathlib/near/499085779 I decided to go with `n + n = 2 * n` instead of `n + n = n * 2` because it feels more natural. Feel free to suggest the opposite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict delegated label:t-algebra$	206/196	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1961Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/ZagierTwoSquares.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/CharZero/Lemmas.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/Language.lean,Mathlib/Data/Complex/Abs.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/Complex/Norm.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Num/Prime.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/LinearAlgebra/AffineSpace/Midpoint.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/Gamma.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/NumberTheory/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/GaussSum.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean	117	13	['JovanGerb', 'YaelDillies', 'github-actions', 'grunweg', 'mathlib-bors', 'riccardobrasca']	nobody	61-39388 2 months ago	61-70559 2 months ago	0-54729 15 hours
21266	ADedecker author:ADedecker	feat: restate uniformContinuous_mul in terms of convergence to uniformity	This is convenient when working with [Filter.Tendsto.congr_uniformity](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/UniformSpace/Basic.html#Filter.Tendsto.congr_uniformity) or [Filter.Tendsto.uniformity_trans](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/UniformSpace/Basic.html#Filter.Tendsto.uniformity_trans), for example. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy merge-conflict delegated	8/0	Mathlib/Topology/Algebra/UniformGroup/Defs.lean	1	5	['ADedecker', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	18-68215 18 days ago	18-68215 18 days ago	0-18788 5 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	14-63838 14 days ago	14-63838 14 days ago	0-214 3 minutes

Review status

There are currently 302 PRs awaiting review. Among these,

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

On the other hand, 121 PRs are unassigned and have not seen a status change in two weeks, and 4 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
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/)	t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	59-24515 2 months ago	59-24528 2 months ago	59-26324 59 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	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	27	['github-actions', 'madvorak', 'shetzl']	nobody	none	51-62097 1 month ago	51-83366 1 month ago	51-83418 51 days
22539	joelriou author:joelriou	feat(Algebra/Homology): construction of left resolutions	Given a fully faithful functor `ι : C ⥤ A` to an abelian category, we introduce a structure `Abelian.LeftResolutions ι` which gives a functor `F : A ⥤ C` and a natural epimorphism `π.app X : ι.obj (F.obj X) ⟶ X` for all `X : A`. This is used in order to construct a resolution functor `LeftResolutions.chainComplexFunctor : A ⥤ ChainComplex C ℕ`. This shall be used in order to derive the tensor product of modules and sheaves of modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	271/19	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	4	1	['github-actions']	nobody	none	45-65943 1 month ago	45-78134 1 month ago	45-78119 45 days
22586	joelriou author:joelriou	feat(CategoryTheory/Localization): the right derivability structure given by functorial resolutions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	152/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfFunctorialResolutions.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean	3	1	['github-actions']	nobody	none	44-72577 1 month ago	44-78044 1 month ago	44-78029 44 days
20230	joelriou author:joelriou	feat(CategoryTheory): categories of homological complexes are Grothendieck abelian	--- - [x] depends on: #19979 - [x] depends on: #20229 - [x] depends on: #20233 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	73/0	Mathlib.lean,Mathlib/Algebra/Homology/GrothendieckAbelian.lean	2	2	['callesonne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1	43-37914 1 month ago	53-39636 1 month ago	53-39619 53 days
8167	sebzim4500 author:sebzim4500	feat: Add new `grw` tactic for rewriting using inequalities.	feat: Add new `grw` tactic for rewriting using inequalities. Co-authored-by: @hrmacbeth, @digama0 --- - [x] depends on: #8796 ```lean example (x y z w : ℝ) (h₁ : x < z) (h₂ : w ≤ y + 4) (h₃ : Real.exp z < 5 * w) : Real.exp x < 5 * (y + 4) := by grw [h₁, ← h₂] exact h₃ ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta modifies-tactic-syntax	552/2	Mathlib.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRW.lean,Mathlib/Tactic/GRW/Core.lean,Mathlib/Tactic/GRW/Lemmas.lean,MathlibTest/GRW.lean,scripts/noshake.json	9	53	['Vierkantor', 'digama0', 'eric-wieser', 'fpvandoorn', 'github-actions', 'hrmacbeth', 'kim-em', 'leanprover-community-mathlib4-bot', 'sebzim4500']	nobody	none	40-61281 1 month ago	41-48250 1 month ago	72-10501 72 days
22739	joelriou author:joelriou	feat(CategoryTheory/Abelian): isomorphisms modulo a Serre class	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	176/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	4	5	['TwoFX', 'github-actions', 'joelriou']	nobody	none	40-40961 1 month ago	40-40961 1 month ago	40-57207 40 days
22404	joelriou author:joelriou	feat(Algebra/Homology): connecting a chain complex and a cochain complex	Given a chain complex `K`: `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0`, a cochain complex `L`: `L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, a morphism `d₀: K.X 0 ⟶ L.X 0` satisfying the identifies `K.d 1 0 ≫ d₀ = 0` and `d₀ ≫ L.d 0 1 = 0`, we construct a cochain complex indexed by `ℤ` of the form `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0 ⟶ L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, where `K.X 0` lies in degree `-1` and `K.X 0` in degree `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	116/0	Mathlib.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean	2	2	['callesonne', 'github-actions']	nobody	1	40-35042 1 month ago	49-60595 1 month ago	49-60580 49 days
22628	scholzhannah author:scholzhannah	feat: finiteness notions on CW complexes	This PR defines three finiteness notions on (classical) CW complexes: finite dimensionality, finite type, and finiteness. A CW complex is finite dimensional if the indexing type of cells is empty in all but finitely many dimensions. It is of finite type if the indexing type of cells is finite in every dimension. Lastly, a CW complex is finite if it is both finite dimensional and of finite type. The PR also provides constructors for CW complexes that are of finite type or finite and proves that a CW complex is finite iff the total number of cells is finite. Co-authored-by: Floris van Doorn --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	375/0	Mathlib.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean	2	5	['github-actions', 'grunweg', 'scholzhannah']	nobody	none	39-66710 1 month ago	43-76009 1 month ago	43-76061 43 days
21129	chrisflav author:chrisflav	perf(RingTheory/Kaehler/JacobiZariski): reorder universe variables	Naming of universe variables has an impact on universe unification. It seems to matter that the universe variables of `R`, `S` and `T` appear before the universe variables of the generators in alphabetical order. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	performance-hack t-algebra label:t-algebra$	18/20	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	37	['chrisflav', 'erdOne', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'mattrobball']	nobody	none	38-79214 1 month ago	72-81675 2 months ago	81-62982 81 days
22531	vasnesterov author:vasnesterov	feat(Analysis): radius of convergence for `FormalMultilinearSeries.compContinuousLinearMap`	- Add basic lemmas `compContinuousLinearMap_id` and `compContinuousLinearMap_comp`. - Prove lower and upper bounds for the convergence radius of `f.compContinuousLinearMap`. - Prove `radius_compNeg`: the convergence radii of `f(x)` and `f(-x)` are equal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	115/6	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,scripts/noshake.json	3	1	['github-actions']	nobody	none	36-85294 1 month ago	36-85311 1 month ago	45-38826 45 days
22767	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory): the augmented simplex category	This PR defines `AugmentedSimplexCategory` as `WithInitial SimplexCategory`. Using the API in `CategoryTheory.WithTerminal`, we check that functors out of this category (resp. out of its opposite) corresponds to cosimplicial (resp. simplicial) objects, and we link various construction about simplicial objects in terms of this category. --- - [x] depends on : #22658 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	119/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean	2	3	['github-actions', 'robin-carlier']	nobody	none	36-76441 1 month ago	36-76462 1 month ago	39-72147 39 days
22948	pelicanhere author:pelicanhere	feat(Algebra/DirectSum): morphism of directsum decomposition	Define morphism of directsum decomposition, which would be later used in defineing graded ring hom. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	68/0	Mathlib/Algebra/DirectSum/Decomposition.lean	1	1	['github-actions']	nobody	none	34-68808 1 month ago	34-81452 1 month ago	34-81498 34 days
22196	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	In this PR, we implement a new tactic that reduces expressions in a `LieRing` to a normal form and checks whether they are equal, and a command which reduces the expression and displays the normal form. The implementation of this tactic imitates the `ring` tactic, using the `Qq` package to implement a specific reduction algorithm, following the theory of Hall sets and Lyndon words. A reference for the algorithm can be found at, for example, [here](https://personal.math.ubc.ca/~cass/research/pdf/Free.pdf). This project is the result of a workshop at Peking University, and @siddhartha-gadgil has helped us a lot on understanding the concepts in metaprogramming. Edit: The changes are reverted to a point where only `AtomM` is used. Co-authored-by: @Thmoas-Guan <2300010733@stu.pku.edu.cn> @yhtq <2100012990@stu.pku.edu.cn> @Blackfeather007 <2100017455@stu.pku.edu.cn> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	821/0	Mathlib.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	7	5	['github-actions', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	nobody	none	34-62343 1 month ago	55-18727 1 month ago	55-18722 55 days
22962	YaelDillies author:YaelDillies	feat: torsion-free monoids	Behind this click-baity title, there is the fact that `Monoid.IsTorsionFree` is incorrect for torsion-free monoids. Indeed, if `n ≠ 0` then `∀ a : α, n • a = 0 → a = 0` is equivalent to `∀ a b : α, n • a = n • b → a = b` only if `α` is a group. If `α` is a monoid (possibly even cancellative!), then the `∀ a : α, n • a = 0 → a = 0` condition is quite weak. This PR introduces this new definition under the names `IsAddTorsionFree`/`IsMulTorsionFree`. Several things to note: * It is a class, while `Monoid.IsTorsionFree` is not. * It is outside of the `Monoid`/`AddMonoid` namespace. My thought is that people who care about torsion-free groups will prefer writing `IsAddTorsionFree G` over `Monoid.IsTorsionFree`. * I am making a new file. This is because the existing definitions talk about order of an element, which is a much more advanced notion than the new one I am offering. * I am not changing the existing definition in this PR. This will be done in a later PR. From Toric Co-authored-by: Patrick Luo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-algebra label:t-algebra$	83/33	Mathlib.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/RingTheory/Binomial.lean	6	1	['github-actions']	nobody	none	34-29111 1 month ago	34-29111 1 month ago	34-58721 34 days
22828	joelriou author:joelriou	feat(CategoryTheory): parametrized adjunctions	Given bifunctors `F : C₁ ⥤ C₂ ⥤ C₃` and `G : C₁ᵒᵖ ⥤ C₃ ⥤ C₂`, this PR introduces adjunctions with a parameter `F ⊣₂ G`. In the case of closed monoidal categories, we obtain `curriedTensor C ⊣₂ internalHom`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	127/0	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Parametrized.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean	3	4	['emilyriehl', 'github-actions', 'joelriou', 'mckoen']	nobody	1	32-77689 1 month ago	36-37951 1 month ago	38-61758 38 days
22794	vasnesterov author:vasnesterov	feat(Tactic/NormNum): `norm_num` extension for `Irrational x^y`	Add `norm_num` extension for `Irrational x^y`. --- I don't disprove `Irrational x^y` when `x^y` is, in fact, rational here, because I hope in the future `norm_num` will be able to simplify such expressions to their rational representations (e.g. `(8/27)^(2/3) --> 4/9`), and then apply `Rat.not_irrational`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	446/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Irrational.lean,MathlibTest/norm_num_ext.lean,scripts/noshake.json	5	1	['github-actions']	nobody	none	32-62248 1 month ago	34-30985 1 month ago	39-31525 39 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	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	1	['github-actions']	nobody	none	32-50804 1 month ago	32-51626 1 month ago	32-51802 32 days
20071	vasnesterov author:vasnesterov	refactor(Data/Seq): reorganize `Seq.lean`	The `Seq` API in the `Seq.lean` file was somewhat disorganized. This PR reorganizes the file to make it more structured. It arranges the API in the following way: 1. Definitions and the `get?` function. 2. Constructors: `nil` and `cons`. 3. Destructors: `head`, `tail`, and `destruct`. 4. Recursion and corecursion principles. 5. Bisimulation. 6. `Terminates` API. 7. `Membership` for sequences. 8. Conversion to and from other types (`List`, `Stream`, `MLList`) and `take` operation as it is required for conversion to `List`. 9. Definitions of other operations on sequences (`append`, `map`, `join`, etc.). 10. Lemmas about conversions and operations, organized into sections by the primary operation of each lemma. --- I tried not to change any proofs here, but had to rewrite some of them due to dependencies and to avoid importing `apply_fun`. The proofs of the following lemmas were changed: * `head_eq_some` * `head_eq_none` * `cons_ne_nil` * `cons_eq_cons` * `ofList` I found it useful to run `git diff --color-moved` to verify that the actual difference is just these proofs and adding sections. - [x] depends on: #19859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	501/441	Mathlib/Data/Seq/Seq.lean,scripts/noshake.json	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	32-399 1 month ago	32-414 1 month ago	39-33853 39 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	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	3	['bryangingechen', 'github-actions']	nobody	none	31-70134 1 month ago	45-54538 1 month ago	45-54531 45 days
23048	scholzhannah author:scholzhannah	feat: PartialEquiv on closed sets restricts to closed map	This PR shows that a PartialEquiv that is continuous on both source and target restricts to a homeomorphism. It then uses that to show that a PartialEquiv with closed source and target and which is continuous on both the source and target restricts to a closed map. --- I need the latter statement to prove that one can transport a CW complex along a PartialEquiv. I had trouble finding a good spot for these statements; I hope this solution works. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	53/0	Mathlib.lean,Mathlib/Topology/PartialEquiv.lean	2	1	['github-actions']	nobody	none	31-65479 1 month ago	31-65479 1 month ago	31-65533 31 days
22824	alreadydone author:alreadydone	chore: generalize universes for (pre)sheaves of types	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	164/132	Mathlib/CategoryTheory/Category/Pairwise.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/PresheafOfFunctions.lean,Mathlib/Topology/Sheaves/SheafCondition/OpensLeCover.lean,Mathlib/Topology/Sheaves/SheafCondition/PairwiseIntersections.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean,Mathlib/Topology/Sheaves/SheafOfFunctions.lean	7	6	['alreadydone', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	none	30-84342 30 days ago	30-84342 30 days ago	34-38444 34 days
22971	mbkybky author:mbkybky	refactor(FieldTheory/KrullTopology): clean up `KrullTopology.lean`	Clean up `KrullTopology.lean` by moving some lemmas to their appropriate locations in earlier files. Also move some lemmas from `IntermediateField/Adjoin/Defs.lean` to `IntermediateField/Basic.lean` since they are used in the proofs of new theorems in `IntermediateField/Algebraic.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	130/126	Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/FieldTheory/SeparableDegree.lean	7	11	['Thmoas-Guan', 'github-actions', 'tb65536', 'yhtq']	nobody	none	30-52623 30 days ago	31-67502 1 month ago	32-79298 32 days
22771	alreadydone author:alreadydone	feat(Homotopy/Lifting): monodromy of a covering map and lifting criterion	Definition 2.1 in https://ncatlab.org/nlab/show/monodromy. Also: + Extract `FundamentalGroupoid.map (f : C(X, Y)) : FundamentalGroupoid X ⥤ FundamentalGroupoid Y` from `fundamentalGroupoidFunctor : TopCat ⥤ CategoryTheory.Grpd` + Define `FundamentalGroup.map (f : C(X, Y)) (x : X) : FundamentalGroup X x →* FundamentalGroup Y (f x)` and `mapOfEq : FundamentalGroup X x →* FundamentalGroup Y y` that takes an assumption `f x = y`. + Redefine `FundamentalGroup` to be `End` rather than `Aut`: since `FundamentalGroupoid` is a groupoid, `End` already has a group structure. + Golf within the file FundamentalGroupoid/Basic. + Generalize `toArrow` up to `fromPath` in `FundamentalGroupoid/FundamentalGroup` from `X : TopCat` to `[TopologicalSpace X]`. Also golfs some proofs and redefines --- - [x] depends on: #22649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	193/147	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	30-12490 30 days ago	30-79006 30 days ago	30-80905 30 days
23111	pechersky author:pechersky	feat(Topology/MetricSpace): pseudometrics as bundled functions	Preparation for results using families of pseudometrics --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	211/0	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean	2	35	['YaelDillies', 'github-actions', 'pechersky', 'plp127']	nobody	none	28-68073 28 days ago	28-69235 28 days ago	30-21786 30 days
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 label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	6	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	none	27-71042 27 days ago	27-74660 27 days ago	27-74710 27 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 label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	none	27-64011 27 days ago	27-67556 27 days ago	27-67602 27 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 label:t-algebra$	6/10	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	none	27-26237 27 days ago	27-42730 27 days ago	27-42780 27 days
22457	Komyyy author:Komyyy	feat(Mathlib/Computability/Ackermann): Ackermann function is computable	It had been proved that Ackermann function is not primitive recursive, but not been proved that it's computable. I proved that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	51/1	Mathlib/Computability/Ackermann.lean	1	11	['Komyyy', 'github-actions', 'vihdzp']	nobody	1	27-23032 27 days ago	46-31826 1 month ago	47-60599 47 days
11563	YaelDillies author:YaelDillies	feat: `∑ i ∈ s with hi : p i, f i hi` syntax for big operators	Define new notation for `Finset.sum`/`Finset.prod`. `∑ i ∈ s with hi : p i, f i hi` now is notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).2`. --- - [x] depends on: #6795 Other notations we could have are * `∑ hi : i ∈ s, f i hi` as notation for `∑ i : s, f i.1 i.2` * `∑ hi : i ∈ s with p i, f i hi` as notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).1` * `∑ hi : i ∈ s with hpi : p i, f i hi hpi` as notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).1 (mem_filter.1 i.2).2` but Eric seems mildly unhappy about them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta label:t-algebra$	27/18	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean	1	27	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'kbuzzard', 'kmill', 'leanprover-community-mathlib4-bot']	nobody	none	26-46325 26 days ago	26-46342 26 days ago	74-66035 74 days
22048	YaelDillies author:YaelDillies	feat: delaborator for `∑ x ∈ s with p x, f x` notation	Co-authored-by: Kyle Miller --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	142/21	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,MathlibTest/BigOps.lean	2	20	['YaelDillies', 'b-mehta', 'github-actions', 'kmill']	nobody	none	26-44901 26 days ago	26-44916 26 days ago	57-2345 57 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	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	10	['github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	none	24-64567 24 days ago	29-74153 29 days ago	30-58613 30 days
8738	grunweg author:grunweg	feat: differential of a local diffeomorphism is a continuous linear equivalence	With the `localInverse` definition, this is a straightforward argument using the chain rule. ------ - [x] depends on: #23219 (the `localInverse` API) - [x] depends on: #8736 Unclear/open question: is there a better solution than these helper lemmas? The current approach feels unelegant. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	92/10	Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	2	20	['ADedecker', 'alreadydone', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel', 'winstonyin']	nobody	none	24-63980 24 days ago	24-63983 24 days ago	60-3974 60 days
22069	Raph-DG author:Raph-DG	feat(LinearMap): Added lemmas relating kernels of linear maps to Submodule.map	Added the lemma ne_map_or_ne_kernel_inter_of_lt stating that if A < B as submodules, then for any linear map f, `ker f ⊓ A ≠ ker f ⊓ B ∨ Submodule.map f A ≠ Submodule.map f B`. We also prove the corollaries ker_inter_mono_of_map_eq and map_mono_of_ker_inter_eq. Co-authored-by: Raphael Douglas Giles (raphaeldouglasgiles@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	28/0	Mathlib/LinearAlgebra/Span/Basic.lean	1	14	['Paul-Lez', 'Raph-DG', 'github-actions', 'j-loreaux']	nobody	none	24-61383 24 days ago	24-61400 24 days ago	58-46501 58 days
23205	xroblot author:xroblot	feat(QuotientGroup): surjectivity and kernel of `QuotientGroup.map`	Prove formulas for the kernel of `QuotientGroup.lift` and `QuotientGroup.map` and that these maps are surjective if the corresponding functions are surjective. --- - [x] depends on: #23269 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	26/0	Mathlib/GroupTheory/QuotientGroup/Defs.lean	1	12	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'xroblot']	nobody	none	24-1340 24 days ago	24-38973 24 days ago	27-40630 27 days
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-topology	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	7	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	none	23-44756 23 days ago	46-83736 1 month ago	46-83780 46 days
22884	tannerduve author:tannerduve	feat(Computability/TuringDegrees): define oracle computability and Turing degrees	### Description Define a model of oracle computability, introducing Turing reducibility (`≤ᵀ`), Turing equivalence (`≡ᵀ`), and Turing degrees as the quotient under Turing equivalence. - `RecursiveIn O f`: A function `f` is recursive in a set of oracles `O` if it can be computed using `O` via basic operations (zero, successor, pairing, composition, primitive recursion, and μ-recursion). - `TuringReducible`: The relation that `f` is recursive in `{g}`, i.e., `f ≤ᵀ g`. - `TuringEquivalent`: A relation defining Turing equivalence between partial functions. - `TuringDegree`: The set of equivalence classes under `TuringEquivalent`, forming a partially ordered structure. Additionally: - Prove that `TuringReducible` is a preorder (reflexive, transitive). - Show that `TuringEquivalent` is an equivalence relation. - Establish that partial recursive functions correspond to functions recursive in the empty oracle set. This formalization follows classical recursion theory (Odifreddi, Soare) and extends previous work by Carneiro. ### Breaking Changes None. ### Dependencies None.	t-computability new-contributor	221/0	Mathlib.lean,Mathlib/Computability/TuringDegrees.lean	2	8	['github-actions', 'tannerduve', 'tristan-f-r']	nobody	none	23-35526 23 days ago	37-52008 1 month ago	37-52055 37 days
23336	kim-em author:kim-em	chore: `erw` in `Topology/Order/`		t-topology	6/7	Mathlib/Topology/Order/LawsonTopology.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/UpperLowerSetTopology.lean	4	4	['github-actions', 'kim-em', 'urkud']	nobody	none	23-32575 23 days ago	23-71727 23 days ago	23-71775 23 days
22655	YaelDillies author:YaelDillies	refactor: make use of `FunLike` for `Submonoid.LocalizationMap`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	156/140	Mathlib/GroupTheory/MonoidLocalization/Away.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Defs.lean	4	1	['github-actions']	nobody	none	22-79397 22 days ago	22-79411 22 days ago	40-19171 40 days
23367	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup/Reduce): add lemmas for toWord and reduce	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR adds some simple helper lemmas for the interaction of `toWord` and `reduce` and basic list / group operations. The RHS of the lemmas often contains more appearances of `reduce`, so they are not marked as `simp` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-geometric-group-theory t-algebra label:t-algebra$	24/0	Mathlib/GroupTheory/FreeGroup/Reduce.lean	1	1	['github-actions']	nobody	none	22-69336 22 days ago	22-69336 22 days ago	22-78015 22 days
23368	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup/ReducedWords): add theory of reduced words	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR adds the file `GroupTheory/FreeGroup/ReducedWords.lean`, where the predicate of reduced words is defined. It is shown that `reduce` and `toWord` produce reduced words. This is done in preparation for the theory of cyclically reduced words. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-geometric-group-theory t-algebra label:t-algebra$	124/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	2	1	['github-actions']	nobody	none	22-69316 22 days ago	22-69316 22 days ago	22-77150 22 days
23197	robin-carlier author:robin-carlier	feat(CategoryTheory/Equivalences): category structure on equivalences	We put a category structure on `(C ≌ D)`. The morphisms are simply natural transformations between the underlying functor. We also provide various API for this structure. --- While this PR contains functoriality of the operation that maps an equivalence to its underlying functor, functoriality of inverses will be in a different PR and recorded in a different file : I feel the most natural way to do this is to bring in the results from `Adjunction.Mates`, but this imports quite a lot of stuff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	69/0	Mathlib/CategoryTheory/Equivalence.lean	1	7	['github-actions', 'joelriou', 'robin-carlier']	nobody	none	22-49939 22 days ago	22-49939 22 days ago	28-28142 28 days
22870	kebekus author:kebekus	feat: behavior of MeromorphicAt.order under powers and inverses	Establish the behavior of `MeromorphicAt.order` under standard operations, including powers and inverses. The results are completely analogous to the existing theorems for `AnalyticAt.order`. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	26/12	Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Order/WithBot.lean	2	1	['github-actions']	nobody	none	22-47481 22 days ago	22-47496 22 days ago	37-14441 37 days
23309	kkytola author:kkytola	feat: left/right order-continuous functions are left/right topology-continuous	Order left/right-continuous functions on (densely ordered) conditionally complete linear orders are topologically left/right-continuous. Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	27/3	Mathlib/Topology/Order/Basic.lean	1	3	['YaelDillies', 'github-actions', 'kkytola']	nobody	none	20-62676 20 days ago	24-57257 24 days ago	24-57243 24 days
23334	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add lemmas about Field.toEuclideanDomain	The behaviour of mod and gcd in a field are somewhat unexpected. I think that adding simp lemmas to reduce them to more well-understood notions will be helpful for people who accidentally end up using them, even if the right-hand side is not necessarily "simp"ler on first sight. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	21/2	Mathlib/Algebra/EuclideanDomain/Field.lean	1	6	['Ruben-VandeVelde', 'acmepjz', 'github-actions']	nobody	none	20-41730 20 days ago	23-79526 23 days ago	23-79582 23 days
23446	acmepjz author:acmepjz	feat(Algebra/Exact): add `Function.Exact.[iff_]rangeFactorization` etc	Two maps `f : M → N` and `g : N → P` are exact if and only if the induced maps `Set.range f → N → Set.range g` are exact. Same for `AddMonoidHom` and `LinearMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discussion: [#Is there code for X? > Function.Exact.rangeFactorization](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Function.2EExact.2ErangeFactorization)	t-algebra label:t-algebra$	41/2	Mathlib/Algebra/Exact.lean	1	1	['github-actions']	nobody	none	20-4583 20 days ago	20-4583 20 days ago	20-4569 20 days
23461	xroblot author:xroblot	feat(GroupTheory/Cyclic): formula for the card & index of kernel & range of powMonoidHom on a cyclic group	We prove formula for the cardinal and index of the kernel and range of `powMonoidHom : x ↦ x ^ d` on a finite cyclic group. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	48/0	Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean	2	1	['github-actions']	nobody	none	19-43954 19 days ago	19-44104 19 days ago	19-44150 19 days
21283	erdOne author:erdOne	feat: topology on Hom(R, S) in `CommRingCat`	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	227/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,scripts/noshake.json	6	5	['dagurtomas', 'erdOne', 'github-actions']	nobody	none	19-41965 19 days ago	19-41965 19 days ago	57-84018 57 days
23266	mariainesdff author:mariainesdff	feat(Algebra/Order/BigOperator): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order t-algebra label:t-algebra$	68/1	Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Data/Finset/Max.lean	3	1	['github-actions']	nobody	none	18-84623 18 days ago	25-57436 25 days ago	25-57480 25 days
23498	Ruben-VandeVelde author:Ruben-VandeVelde	chore(Topology.MetricSpace.Lipschitz): stop depending on Topology.Algebra	Noticed while playing with the new `directoryDependency` linter. Not sure if these could be proved without assuming the continuity of real multiplication. Copyright from https://github.com/leanprover-community/mathlib3/pull/1921 and https://github.com/leanprover-community/mathlib4/pull/11840. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		60/34	Mathlib.lean,Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Topology/Algebra/MetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Algebra.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/PiNat.lean	9	1	['github-actions']	nobody	none	18-69414 18 days ago	18-69474 18 days ago	18-69460 18 days
23425	vasnesterov author:vasnesterov	feat(Algebra/BigOperators): simprocify `prod_univ_one/two/three/...`	Add a simproc `prod_univ_many` that rewrites `∏ (i : Fin n), f i` as `f 0 * f 1 * ... * f (n - 1)`, generalizing `prod_univ_one`, `prod_univ_two`, ..., `prod_univ_eight`. --- It seems impossible to use to_additive here to avoid reimplementing the same simproc for additive goals. Just wanted to hear your ideas, before doing it. - [x] depends on: #23427 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	51/0	Mathlib/Data/Fin/Tuple/Reflection.lean	1	9	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov']	nobody	none	18-62394 18 days ago	19-16166 19 days ago	19-65038 19 days
23502	Timeroot author:Timeroot	feat(ModelTheory/Semantics): BoundedFormula.realize_foldr_imp	Two lemmas for `realize`ing a `BoundedFormula`. --- Pulled out from #19695. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	20/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	1	['github-actions']	nobody	none	18-59207 18 days ago	18-60107 18 days ago	18-60162 18 days
23470	erdOne author:erdOne	feat(AlgebraicGeometry): section of a k-scheme is a closed immersion	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	89/3	Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/PullbackCarrier.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/Scheme.lean	6	7	['chrisflav', 'github-actions']	nobody	1	18-47846 18 days ago	19-18856 19 days ago	19-18886 19 days
21909	erdOne author:erdOne	feat(RingTheory/Invariants): Generalize to profinite groups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	350/5	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean	6	2	['TwoFX', 'github-actions']	nobody	none	18-34347 18 days ago	18-34347 18 days ago	22-22526 22 days
22265	Timeroot author:Timeroot	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality	filled in a `proof_wanted` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	78/12	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	5	7	['Timeroot', 'github-actions', 'jsm28', 'urkud']	nobody	none	18-17846 18 days ago	18-54760 18 days ago	38-58541 38 days
23527	erdOne author:erdOne	feat(Topology): subspace of quotient topology is quotient of subspace topology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	69/0	Mathlib/Topology/Maps/OpenQuotient.lean	1	1	['github-actions']	nobody	none	17-85156 17 days ago	17-85245 17 days ago	17-85231 17 days
23528	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add isOpen_setOf_affineIndependent	From sphere-eversion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	15/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean	1	1	['github-actions']	nobody	none	17-82840 17 days ago	17-82840 17 days ago	17-82887 17 days
22635	Kiolt author:Kiolt	feat: submonoid of pairs with quotient in a submonoid	This submonoid is part of the definition of toric ideals. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-algebra label:t-algebra$	36/0	Mathlib.lean,Mathlib/GroupTheory/MonoidLocalization/DivPairs.lean	2	10	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	1	17-80464 17 days ago	17-80517 17 days ago	43-67450 43 days
22151	alreadydone author:alreadydone	feat(RingTheory): a semiprimary ring is Noetherian/Artinian iff its Jacobson radical is fg	A key fact used is `Module.FG.smul`: if `I` is a two-sided ideal of `R` that is f.g. as a left ideal and `N` is a f.g. `R`-module, then `I • M` is also a f.g. `R`-module. Many lemmas about coprimality of ideals are also generalized to the noncommutative, two-sided setting. --- - [x] depends on: #21904 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	216/156	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/RingTheory/Extension.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/HopkinsLevitzki.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean	8	4	['alreadydone', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	none	17-69268 17 days ago	18-60011 18 days ago	45-68077 45 days
22089	sgouezel author:sgouezel	feat: composing a continuous multilinear map with continuous linear maps is analytic in both variables	Also prove that the composition of continuously polynomial functions is continuously polynomial. --- - [x] depends on: #22102 - [x] depends on: #22789 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	209/3	Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Data/Multiset/DershowitzManna.lean,Mathlib/Order/KrullDimension.lean	5	7	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	none	17-48114 17 days ago	17-48128 17 days ago	56-14679 56 days
22279	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	In this PR, we defined the concept of a homogeneous relation and proved some properties about homogeneous relations. The main result of this PR is showing that taking `RingQuot` by a homogeneous relation can give a graded structure on the quotient ring. This result can be used to define graded structures on rings obtained using `RingQuot`, e.g. the Symmetric Algebra defined in #21539 can be verified to have such a structure. Co-authored-by: Zhixuan Dai @atstarrysky <22300180006@m.fudan.edu.cn> Yiming Fu @pelicanhere Zhenyan Fu @pumpkin678 Raphael Douglas Giles @Raph-DG Jiedong Jiang @jjdishere - [x] depends on: #22354 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	455/0	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/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousRelation.lean	8	6	['Paul-Lez', 'github-actions', 'mathlib4-dependent-issues-bot', 'ocfnash', 'xyzw12345']	nobody	none	17-8647 17 days ago	17-8650 17 days ago	18-40441 18 days
23496	chrisflav author:chrisflav	chore(Algebra): the five lemma for modules	We reprove the five lemma for modules for universe generality, avoiding the import of `Mathlib.CategoryTheory.Abelian.DiagramLemmas.Four` in otherwise non-category-theoretic files and for ease of application. --- See #23497 for a golf using this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	158/0	Mathlib.lean,Mathlib/Algebra/FiveLemma.lean	2	7	['acmepjz', 'chrisflav', 'erdOne', 'github-actions']	nobody	none	17-8005 17 days ago	18-70052 18 days ago	18-70038 18 days
23531	fpvandoorn author:fpvandoorn	refactor: generalize `unbounded_of_tendsto_atTop`	--- Not sure if I like this style of proofs with `aesop` for future PRs. It's short, though. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	13/19	Mathlib/Order/Filter/AtTopBot/Basic.lean	1	2	['github-actions', 'sgouezel']	nobody	none	16-74710 16 days ago	17-77144 17 days ago	17-77130 17 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	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	16	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	nobody	none	16-66905 16 days ago	16-67390 16 days ago	19-14394 19 days
23282	joelriou author:joelriou	feat(CategoryTheory): monomorphisms in Type are stable under transfinite compositions	`monomorphisms (Type u)` is stable under cobase change, filtered colimits and transfinite compositions. (The file `CategoryTheory.Types` is also moved to `CategoryTheory.Types.Basic`.) (This is extended to presheaves of types in #23298.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	159/15	Mathlib.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/EpiMono.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Functor/Hom.lean,Mathlib/CategoryTheory/IsomorphismClasses.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Monad/Types.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean,Mathlib/CategoryTheory/SmallObject/WellOrderInductionData.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/CategoryTheory/Types/Basic.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean,Mathlib/CategoryTheory/UnivLE.lean,Mathlib/Control/Fold.lean,Mathlib/Data/Set/FunctorToTypes.lean	18	1	['github-actions']	nobody	none	16-53864 16 days ago	16-54856 16 days ago	25-33717 25 days
17802	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Veblen): epsilon and gamma ordinals	We define the epsilon function `ε_ o = veblen 1 o`, and the gamma function `Γ_ o` which enumerates the fixed points of `veblen · 0`. --- - [x] depends on: #17751 - [x] depends on: #18611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	146/7	Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	2	15	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	16-23351 16 days ago	16-23351 16 days ago	48-35738 48 days
19946	vihdzp author:vihdzp	feat(SetTheory/ZFC/Basic): order instances	Sets form a partial order under the subset relation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	38/2	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	8	['alreadydone', 'b-mehta', 'github-actions', 'vihdzp']	nobody	1	16-7569 16 days ago	16-11931 16 days ago	47-12661 47 days
23370	kebekus author:kebekus	feat: taking the divisor of a meromorphic function commutes with restriction	Deliver on a very simple TODO, show that taking the divisor of a meromorphic function commutes with restriction. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	12/1	Mathlib/Analysis/Meromorphic/Divisor.lean	1	1	['github-actions']	nobody	none	16-3867 16 days ago	16-3882 16 days ago	22-68841 22 days
23363	kebekus author:kebekus	feat: congruence lemmas for divisors of meromorphic functions	Deliver on open TODO and state elementary congruence lemmas for divisors of meromorphic functions. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	78/1	Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Meromorphic/Divisor.lean	2	1	['github-actions']	nobody	none	16-3625 16 days ago	16-3640 16 days ago	22-81085 22 days
22574	joelriou author:joelriou	refactor(CategoryTheory): redefine full subcategories using `ObjectProperty`	The type `ObjectProperty` was recently introduced #22286 for predicates on the objects of a category. We redefine `FullSubcategory` as `ObjectProperty.FullSubcategory`. This refactor PR mostly does only minimal changes to take into account that some definitions were renamed. The only significant exception is for the definition of the category of finitely generated modules in `Algebra.Category.FGModuleCat.Basic`, which should become the better practice for defining full subcategories, especially when we want to infer certain type classes: define a property of objects (here `ModuleCat.isFG`) and define the category as an abbreviation (here `abbrev FGModuleCat := (ModuleCat.isFG R).FullSubcategory`). Following this approach, significantly many of the typeclasses on the category `FGModuleCat R` can be inferred automatically. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	711/678	Mathlib.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean,Mathlib/CategoryTheory/Adjunction/Reflective.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Filtered/Small.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/CategoryTheory/InducedCategory.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/FinallySmall.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/LocallySmall.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/MorphismProperty/IsInvertedBy.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/Indization.lean,Mathlib/CategoryTheory/Sites/EffectiveEpimorphic.lean,Mathlib/CategoryTheory/Sites/SheafOfTypes.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/Sheaves/Alexandrov.lean,Mathlib/Topology/Sheaves/SheafCondition/OpensLeCover.lean,Mathlib/Topology/Sheaves/SheafCondition/PairwiseIntersections.lean	48	1	['github-actions']	nobody	none	15-83377 15 days ago	15-86093 15 days ago	42-39708 42 days
21966	vasnesterov author:vasnesterov	feat(Tactic/Order): support `⊤`, `⊥`, and lattice operations	Support `⊤`, `⊥`, and lattice operations in the `order` tactic. --- - [x] depends on: #21877 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	227/47	Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Preprocessing.lean,MathlibTest/order.lean,scripts/noshake.json	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	15-82102 15 days ago	15-82118 15 days ago	49-78617 49 days
23627	kebekus author:kebekus	feat: add logarithmic counting function of Value Distribution Theory	Implement the logarithmic counting function of Value Distribution Theory and provide supporting API. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	217/0	Mathlib.lean,Mathlib/Analysis/Complex/ValueDistribution/CountingFunction.lean	2	1	['github-actions']	nobody	none	15-74016 15 days ago	15-74286 15 days ago	15-74343 15 days
22052	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Lambda-squared sieves and prove important properties	This PR: * Defines lambda-squared sieves. * Proves they are upper bound sieves. * Proves that the corresponding main sum is a quadratic form. --- - [x] depends on: #21880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-number-theory	247/1	Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean	2	6	['Ruben-VandeVelde', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	none	15-70487 15 days ago	30-62620 30 days ago	30-62605 30 days
23632	JovanGerb author:JovanGerb	perf(CategoryTheory/Subobject/Lattice): reorder instance arguments	The `HasImages C` type class fails more quickly, so I set it as the first type class argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	4/5	Mathlib/CategoryTheory/Subobject/Lattice.lean	1	4	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	none	15-67321 15 days ago	15-69375 15 days ago	15-69425 15 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	34/11	Cache/IO.lean,Cache/Main.lean	2	9	['eric-wieser', 'github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	none	14-65472 14 days ago	14-65472 14 days ago	17-48864 17 days
23657	grunweg author:grunweg	feat: euclidean half spaces and quadrants have convex interior	These lemmas are a prerequisite for #23658, which will impose that real or complex models with corners have convex interior. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	48/0	Mathlib/Geometry/Manifold/Instances/Real.lean	1	9	['Ruben-VandeVelde', 'github-actions', 'grunweg']	nobody	none	14-62087 14 days ago	15-852 15 days ago	15-838 15 days
23603	YaelDillies author:YaelDillies	feat: distributive Haar characters	The name is made up in analogy with modular characters. From FLT Co-authored-by: Andrew Yang Co-authored-by: Javier López-Contreras <38789151+javierlcontreras@users.noreply.github.com> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-measure-probability	87/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean	2	5	['AntoineChambert-Loir', 'YaelDillies', 'github-actions', 'tb65536']	nobody	none	14-60349 14 days ago	15-71817 15 days ago	16-45940 16 days
23673	erdOne author:erdOne	feat(AlgebraicGeometry): delaborator for coercing schemes to types	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	21/0	Mathlib/AlgebraicGeometry/Scheme.lean	1	1	['github-actions']	nobody	none	14-57936 14 days ago	14-57936 14 days ago	14-57987 14 days
23440	xroblot author:xroblot	chore(NumberField/Units): make `torsionOrder` a `Nat`	Originally, the order of the torsion subgroup of units of a number field was defined as a `PNat` since `rootsOfUnity` was using `PNat`. This is not the case anymore since `rootsOfUnity` is now using `NeZero` instead. Thus, we change the type of `torsionOrder` to `Nat` and change to an `abbrev` so that it gets a `NeZero` instance automatically. As a bonus, we also prove that `torsionOrder` is even. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	17/6	Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean	2	1	['github-actions']	nobody	none	14-57645 14 days ago	20-52609 20 days ago	20-52653 20 days
23424	YaelDillies author:YaelDillies	chore: move `StrictMonoOn f s → InjOn f s` earlier	This is motivated by the need to have these lemmas early in #23177. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	29/34	Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Set/Monotone.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Monotone.lean,Mathlib/Order/ModularLattice.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Order/Monotone/Extension.lean	10	1	['github-actions']	nobody	none	14-50106 14 days ago	14-50120 14 days ago	20-62805 20 days
23676	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` for localizations and quotients	All these removed instances of `induction'` generate only one subgoal. In some cases `obtain` can be used. The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..08c06520879 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if subgoals.toList.length ≤ 1 then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14270845291/job/40003467676).	tech debt	87/108	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Pointwise/Stabilizer.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/SetTheory/Surreal/Basic.lean	25	7	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	none	14-26407 14 days ago	14-47449 14 days ago	14-47435 14 days
23678	plp127 author:plp127	feat: recursor for nonempty lists	Adds `List.recNeNil` and `List.recOnNeNil` for motives that depend on the list being nonempty. Taken from [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/accessing.20the.20source.20case.20during.20induction/near/502101211). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	40/0	Mathlib/Data/List/Induction.lean	1	5	['eric-wieser', 'github-actions', 'plp127']	nobody	none	14-25086 14 days ago	14-45645 14 days ago	14-45700 14 days
23681	Timeroot author:Timeroot	feat(Algebra/Polynomial): Descartes' Rule of signs	Proof of Descartes' Rule of Signs. Last PR from https://github.com/Timeroot/lean-descartes-signs , now that #9085 is merged. Defines `Polynomial.SignVariations` as the relevant quantity, and `descartes_rule_of_signs` as the headline theorem. --- I tried to clean it up + golf it down and did shrink it a good deal. The lemma `signvar_mul_eraseLead_le_of_nextCoeff` is still 142 lines, and `succ_sign_lin_mul` is ~140 lines of code as well. Those are the ugly ones. I welcome ideas if someone wants to try to clean them up more! But the proof really does require an annoying bit of case-splitting, as far as I can tell. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	661/3	Mathlib.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean	5	1	['github-actions']	nobody	none	14-23570 14 days ago	14-39660 14 days ago	14-39711 14 days
23687	plp127 author:plp127	feat: clopen characterization of connected spaces	Proves that a space is connected iff it contains no nontrivial clopen sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	13/0	Mathlib/Topology/Connected/Clopen.lean	1	1	['github-actions']	nobody	none	14-17659 14 days ago	14-17660 14 days ago	14-17717 14 days
23684	alreadydone author:alreadydone	feat(RingTheory): integral extensions of comm. rings are local homs	--- The import increase only affects one file so I hope it's okay. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	57/64	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/SimpleRing/Field.lean	12	4	['alreadydone', 'github-actions', 'xroblot']	nobody	1	13-84334 13 days ago	14-29332 14 days ago	14-29356 14 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	4	['alreadydone', 'erdOne', 'github-actions', 'xroblot']	nobody	2	13-84254 13 days ago	14-60602 14 days ago	14-60601 14 days
23360	kim-em author:kim-em	chore: review of `erw` in `Algebra/Homology/DerivedCategory`			21/15	Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/CategoryTheory/Shift/SingleFunctors.lean	5	2	['Ruben-VandeVelde', 'github-actions']	nobody	none	13-45347 13 days ago	23-14806 23 days ago	23-14792 23 days
21969	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 is the first of hopefully many PRs upstreaming work that I have done on diffeological spaces in [my orbifolds repo](https://github.com/peabrainiac/lean-orbifolds), containing the first half of `Diffeology/Basic.lean`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	472/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib,scripts/noshake.json	4	22	['github-actions', 'grunweg', 'lecopivo', 'peabrainiac']	nobody	none	13-919 13 days ago	29-82317 29 days ago	11-19972 11 days
23594	YaelDillies author:YaelDillies	refactor: merge `DomMulAct` and `DomAddAct` into `DomAct`	This has several advantages: * Less API surface with a single definition instead of two * Better match the existing `ConjAct` type synonym * We get to use a better name for the multiplication by an element of the type synonym: Previously `dmaSMul`, now `domSMul`. and no inconvenient because the instances for `DomMulAct` and `DomAddAct` are by definition disjoint. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		337/335	Mathlib.lean,Mathlib/Algebra/Group/Translate.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/DomAct/ActionHom.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/DomAct.lean,Mathlib/MeasureTheory/Function/AEEqFun/DomAct.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/Topology/Algebra/Constructions/DomAct.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean	16	4	['YaelDillies', 'eric-wieser', 'github-actions', 'urkud']	nobody	none	12-83075 12 days ago	16-58371 16 days ago	16-58357 16 days
22933	chrisflav author:chrisflav	feat(RingTheory/LocalProperties): constructor for `RingHom.OfLocalizationSpan`	Adds a constructor for `RingHom.OfLocalizationSpan` where `P (algebraMap (Localization.Away r) (Localization.Away r ⊗[R] S))` has to be shown for a covering family. This is convenient in practice, because the base change API is the more generally applicable framework. -- - I think the import increase is fine, but if people are not happy with it, I can instead make a new file `Mathlib.RingTheory.LocalizationAway.BaseChange`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	73/3	Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	3	1	['github-actions']	nobody	none	11-76785 11 days ago	35-57799 1 month ago	35-57838 35 days
23365	vasnesterov author:vasnesterov	feat(Tactic/Simproc): nested quantifiers in `existsAndEq`	Generalize the `existsAndEq` simproc to nested existential quantifiers. For example `∃ a, p a ∧ ∃ b, a = f b ∧ q b` now simplifies to `∃ b, p (f b) ∧ q b`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	440/73	Mathlib/Tactic/Simproc/ExistsAndEq.lean,MathlibTest/Simproc/ExistsAndEq.lean	2	40	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vasnesterov']	nobody	none	11-2031 11 days ago	16-31175 16 days ago	21-57820 21 days
23252	mariainesdff author:mariainesdff	feat(Algebra/Polynomial): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	49/1	Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/Splits.lean	7	8	['alreadydone', 'github-actions', 'mariainesdff']	nobody	none	10-63580 10 days ago	16-61597 16 days ago	25-69829 25 days
23320	Whysoserioushah author:Whysoserioushah	feat(Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum	co-authored by: @jjaassoonn splited from [#23216](https://github.com/leanprover-community/mathlib4/pull/23216) following @eric-wieser advice --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	81/0	Mathlib.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	2	42	['Paul-Lez', 'Whysoserioushah', 'eric-wieser', 'github-actions', 'kbuzzard']	nobody	none	10-26654 10 days ago	24-30597 24 days ago	24-30645 24 days
23381	vlad902 author:vlad902	feat: copy Subgroup lemma for Submonoid	This is an exact copy of `Subgroup.map_top_of_surjective`, copied for Submonoid.	t-algebra label:t-algebra$	8/0	Mathlib/Algebra/Group/Submonoid/Operations.lean	1	5	['eric-wieser', 'github-actions', 'urkud', 'vlad902']	nobody	none	10-20148 10 days ago	22-43927 22 days ago	22-44209 22 days
22474	joelriou author:joelriou	feat(CategoryTheory/Functor): more API for pointwise Kan extensions	Transport pointwise Kan extensions via isomorphisms/equivalences. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	157/7	Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean	4	1	['github-actions']	nobody	none	9-82923 9 days ago	46-386 1 month ago	47-30661 47 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	255/1	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	17	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'xroblot']	nobody	1	8-78571 8 days ago	19-38234 19 days ago	20-40754 20 days
23472	erdOne author:erdOne	feat(Topology): Continuous open maps with irreducible fibers induce bijections between irreducible components	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	77/0	Mathlib/Topology/Irreducible.lean	1	3	['ADedecker', 'erdOne', 'github-actions']	nobody	none	8-72477 8 days ago	19-14962 19 days ago	19-15008 19 days
23181	YaelDillies author:YaelDillies	chore(UniformSpace/Defs): move entourages to their own file	What's left in `UniformSpace.Defs` is precisely the theory of the uniformity filter. The motivation is that the theory of coverings and packings in both high dimensional probability and dynamics can be based on entourages, while they have little to do with the uniformity filter (indeed, entourages are in a sense a quantitative version of the uniformity filter). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	180/207	Mathlib.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Entourage.lean	4	12	['ADedecker', 'PatrickMassot', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	none	8-63740 8 days ago	22-78140 22 days ago	26-12171 26 days
23251	mariainesdff author:mariainesdff	feat(FieldTheory/IntermediateField/Adjoin): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	57/0	Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean	2	16	['alreadydone', 'github-actions', 'mariainesdff', 'tb65536']	nobody	none	8-40793 8 days ago	25-78988 25 days ago	25-78974 25 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/)	t-algebra label:t-algebra$	19/46	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	13	['YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	none	8-19053 8 days ago	59-54777 2 months ago	59-63930 59 days
23338	WilliamCoram author:WilliamCoram	feat: restricted power series form a ring	We define restricted powerseries over a normed ring R, and show they form a ring when R has the ultrametric property. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	17	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg']	nobody	none	7-58164 7 days ago	23-67517 23 days ago	23-67642 23 days
23324	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` with 5+ variables, part 3	Based on a comment by @apnelson1 on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508274747). The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..29ec70424c7 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if 5 ≤ names.size then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14085064444/job/39446843657).	tech debt	168/119	Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/RingTheory/EssentialFiniteness.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Kaehler/Polynomial.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Polynomial/Ideal.lean,Mathlib/RingTheory/PowerSeries/Order.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/SetTheory/PGame/Order.lean	22	12	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	none	7-29422 7 days ago	14-53560 14 days ago	22-52936 22 days
23066	ybenmeur author:ybenmeur	feat: more lemmas for Tannaka duality for finite groups	Prove more of the lemmas needed to prove Tannaka duality for finite groups. --- This is everything that doesn't depend on `eval_of_algHom` (#23065). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	44/0	Mathlib/RepresentationTheory/Tannaka.lean	1	15	['github-actions', 'kbuzzard', 'ybenmeur']	nobody	1	6-12280 6 days ago	31-51048 1 month ago	31-51097 31 days
22684	vlad902 author:vlad902	feat(Topology): add `ContinuousOn` union API lemmas	Add two lemmas to allow going from continuity of a union to continuity on the individual sets, and continuity on two open sets to continuity on their union. Note that there is already an existing lemma for continuity of the union of two closed sets.	new-contributor t-topology	30/3	Mathlib/Topology/ContinuousOn.lean	1	17	['Paul-Lez', 'github-actions', 'grunweg', 'peabrainiac', 'vlad902']	nobody	none	5-31303 5 days ago	42-75302 1 month ago	42-75297 42 days
23074	plp127 author:plp127	feat: `Fact (0 < 1)` and `Fact (0 ≤ 1)`	Adds `Fact (0 < 1)` and `Fact (0 ≤ 1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	7/0	Mathlib/Algebra/Order/ZeroLEOne.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'kim-em', 'leanprover-bot', 'plp127', 'vlad902']	nobody	none	5-1996 5 days ago	31-39884 1 month ago	31-39930 31 days
22256	plp127 author:plp127	feat: Metric Spaces are T6	This PR shows that metric spaces are T6. It also generalizes the contents of Mathlib/Topology/GDelta/UniformSpace to apply to metrizable spaces. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60IsClosed.2EisG.CE.B4.60) thread. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	127/63	Mathlib.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/GDelta/Basic.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/GDelta/UniformSpace.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Separation/GDelta.lean	11	29	['github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127', 'urkud']	nobody	none	4-34757 4 days ago	45-32933 1 month ago	52-32528 52 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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	91/11	Mathlib/Algebra/Ring/Units.lean,Mathlib/RingTheory/Localization/Away/Basic.lean	2	8	['github-actions', 'plp127', 'vihdzp']	nobody	none	3-72527 3 days ago	43-34529 1 month ago	43-34573 43 days
23547	chrisflav author:chrisflav	feat(AlgebraicGeometry): codescent implies descent	Let `P` and `P'` be morphism properties of schemes. We show some results to deduce that `P` descends along `P'` from a codescent property of ring homomorphisms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	260/1	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/AffineAnd.lean,Mathlib/AlgebraicGeometry/Morphisms/Descent.lean,Mathlib/RingTheory/RingHomProperties.lean	4	12	['chrisflav', 'erdOne', 'github-actions']	nobody	none	3-67965 3 days ago	17-65220 17 days ago	17-65206 17 days
23339	joelriou author:joelriou	feat(CategoryTheory): the colimit type of a functor to types	Given a category `J` (with `J : Type u` and `[Category.{v} J]`) and a functor `F : J ⥤ Type w`, we introduce a type `F.ColimitType : Type (max u w)`, which satisfies a certain universal property of the colimit: it is defined as a suitable quotient of `Σ j, F.obj j`. This universal property is not expressed in a categorical way (as in general `Type (max u w)` is not the same as `Type u`). (This type `F.ColimitType` is basically the same as `CategoryTheory.Limits.Types.Quot` that is defined in `CategoryTheory.Limits.Types`, but we expand the API (with minimal imports to category theory) so that it may be used in future PRs to refactor both `DirectedSystem` and the construction of colimits in `Type`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	272/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean	2	3	['AntoineChambert-Loir', 'github-actions', 'joelriou']	nobody	none	3-49671 3 days ago	16-54198 16 days ago	23-37338 23 days
22881	Champitoad author:Champitoad	feat(CategoryTheory/Topos): add representability results for subobject classifier	We add a section `Representability` at the end of `Mathlib.CategoryTheory.Topos.Classifier` where we formalize the necessary lemmas and definitions that lead to the proof of `CategoryTheory.isRepresentable_hasClassifier_iff`, which states that a category `C` has a subobject classifier if and only if the subobjects presheaf `CategoryTheory.Subobject.presheaf C` is representable (Proposition 1 in Section I.3 of Sheaves in Geometry and Logic [MM92]). The toughest part is found in definition `CategoryTheory.Classifier.fromRepresentation`, which formalizes as closely as possible the argument given in [MM92, pp. 33-34]. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-category-theory	251/22	Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/Presheaf.lean,Mathlib/CategoryTheory/Topos/Classifier.lean	3	21	['Champitoad', 'github-actions', 'joelriou']	nobody	none	2-75571 2 days ago	16-61312 16 days ago	30-81318 30 days
23161	mans0954 author:mans0954	feature(Data/Finset/RangeDistance): abs_sub_lt_of_mem_finset_range	The distance between two elements of `Finset.range N` (i.e. absolute value of the difference as integers) is less than `N`. A lemma I found useful for something I was working on, so sharing here in case it's of wider interest. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	30/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	3	['fbarroero', 'github-actions']	nobody	none	2-51402 2 days ago	29-46279 29 days ago	29-46274 29 days
22974	YaelDillies author:YaelDillies	refactor: use a junk value for the analytic order of a non-analytic function	Currently, the order of an analytic function is called `AnalyticAt.order` and has a single explicit argument `hf : AnalyticAt 𝕜 f z₀`. This means that working with analytic functions results in contexts full of `hf.order` or, worse, `⋯.order`. This PR makes the `f` and `z₀` arguments explicit, and drops the `hf` one by introducing a junk value of `0` for non-analytic functions. The resulting function is called `eanalyticOrderAt` and I am also adding a `Nat`-valued version `analyticOrderAt` since `(eanalyticOrderAt f z₀).toNat` was appearing in quite a few lemmas. --- The same change could be performed for meromorphic functions once you are convinced. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	187/101	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Data/ENat/Basic.lean	4	7	['YaelDillies', 'github-actions', 'loefflerd', 'urkud']	nobody	none	1-42454 1 day ago	16-64661 16 days ago	31-25975 31 days
22792	madvorak author:madvorak	feat(Mathlib/Data/Fin/Pigeonhole): pigeonhole-like results for Fin	Consider the following settings: ``` import Mathlib example (X Y : Type) [Fintype X] [Fintype Y] (f : X → Y) (hf : f.Injective) : Fintype.card X ≤ Fintype.card Y := by hint example (m n : ℕ) (f : Fin m → Fin n) (hf : f.Injective) : m ≤ n := by hint example (X Y : Type) [Fintype X] [Fintype Y] (f : X ↪ Y) : Fintype.card X ≤ Fintype.card Y := by hint example (m n : ℕ) (f : Fin m ↪ Fin n) : m ≤ n := by hint ``` The 1st and 3rd `hint` succeed, but the 2nd a 4th `hint` fail. The problem is obviously that `exact?` does not see through `Fintype.card (Fin n) = n` when searching for appropriate lemma. It may seem to not be a problem, as it will rarely derail experienced Mathlib users — after all, experienced Leaners usually go directly for the `Finset` or `Fintype` version. However, beginners frequently work with `Fin` and they will expect stuff like ``` theorem le_of_injective (f : Fin m → Fin n) (hf : f.Injective) : m ≤ n ``` to exist; therefore, when `hint` or `exact?` fails, it is a very unpleasant surprise. This PR addressed this issue; not to provide useful content for advanced users, but to make Mathlib more useful for beginners. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	38/0	Mathlib.lean,Mathlib/Data/Fin/Pigeonhole.lean	2	1	['github-actions']	nobody	none	1-41259 1 day ago	39-59594 1 month ago	39-59649 39 days
23677	upobir author:upobir	feat(Mathlib/RingTheory/Int/Basic): add eq_pow_of_mul_eq_pow for Nat	--- This pr adds theorems analogous to [Int.sq_of_isCoprime](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Int/Basic.html#Int.sq_of_isCoprime), but with generic power and both left and right versions. I had asked in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Nat.20and.20left.2C.20right.20version.20of.20Int.2Esq_of_isCoprime) before to make sure this theorem was missing. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	20/3	Mathlib/RingTheory/Int/Basic.lean	1	1	['github-actions']	nobody	none	1-41067 1 day ago	14-47010 14 days ago	14-47069 14 days
22680	kebekus author:kebekus	feat: behavior of AnalyticAt.order under addition	Deliver on one of the open TODOs and establish the behavior of `AnalyticAt.order` under addition. Add missing `fun_prop` lemma on the stability of analytic functions under `HPow.hPow`. Generalize the statement on the behavior of `AnalyticAt.order` under multiplication to scalar multiplication. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	178/24	Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Order.lean	2	10	['girving', 'github-actions', 'kebekus', 'loefflerd']	nobody	none	0-79839 22 hours ago	38-7945 1 month ago	42-49689 42 days
22890	BGuillemet author:BGuillemet	feat: add versions of the Lebesgue number lemma	Add versions of the Lebesgue number lemma, for coverings by neighborhoods rather than by open subsets (in `Topology/UniformSpace/Compact.lean`). Add specializations of the Lebesgue number lemma for extended metric spaces (in `Topology/EMetricSpace/Basic.lean`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	87/0	Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/UniformSpace/Compact.lean	2	1	['github-actions']	nobody	none	0-66193 18 hours ago	37-23984 1 month ago	37-23970 37 days
23386	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/MultiplePretransitivity): define multiply transitive actions	This PR defines multiply transitive actions and proves the first basic lemmas about them. * `MulAction.IsMultiplyPretransitive`: An multiplicative action of a group `G` on a type `α` is n-transitive if the action of `G` on `Fin n ↪ α` is pretransitive. * Any action is 0-pretransitive * `MulAction.is_one_pretransitive_iff` : An action is 1-pretransitive iff it is pretransitive * `MulAction.is_two_pretransitive_iff` : An action is 2-pretransitive if for any `a`, `b`, `c`, `d`, such that `a ≠ b` and `c ≠ d`, there exist `g : G` such that `g • a = b` and `g • c = d`. * `MulAction.isMultiplyPretransitive_of_le` : If an action is `n`-pretransitive, then it is `m`-pretransitive for all `m ≤ n`. ## Remarks on implementation These results are results about actions on types `n ↪ α` induced by an action on `α`, and some results are developed in this context. --- depends on: #24167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	524/0	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean	6	4	['AntoineChambert-Loir', 'D-Thomine', 'github-actions']	nobody	none	0-58166 16 hours ago	22-25190 22 days ago	22-25191 22 days
22651	101damnations author:101damnations	feat(RepresentationTheory/*): subrepresentations, quotients by subrepresentations, and representations of quotient groups	Given a `G`-representation `(V, ρ)` and a `G`-invariant submodule `W ≤ V`, this PR defines the restriction of `ρ` to `W` as a representation, and the representation on `V / W` induced by `ρ`. When `S` is a normal subgroup of `G` on which `ρ` is trivial, we also define the `G / S` representation induced by `ρ`. We use this to define the `G / S` representation on `V^S`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	170/11	Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	3	1	['github-actions']	nobody	none	0-39124 10 hours ago	43-49196 1 month ago	43-49249 43 days
22929	b-mehta author:b-mehta	feat(Order/Cover): characterise covering in Pi types	Characterise the covering relation in products of partial orders. Generalise this characterisation to products of preorders. Use the characterisation to significantly simplify the characterisation of atoms in products of partial orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	137/41	Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean	2	2	['b-mehta', 'github-actions']	nobody	none	0-38737 10 hours ago	35-65271 1 month ago	35-65326 35 days
22748	joelriou author:joelriou	feat(CategoryTheory/Localization): the calculus of fractions that is deduced from an adjunction	If `G ⊣ F` is an adjunction, and `F` is fully faithful, then there is a left calculus of fractions for the inverse image by `G` of the class of isomorphisms. (The dual statement is also obtained.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	67/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/OfAdjunction.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean	3	1	['github-actions']	nobody	none	0-37711 10 hours ago	40-45916 1 month ago	40-45902 40 days
23217	acmepjz author:acmepjz	chore(AlgebraicGeometry/EllipticCurve/*): refactor VariableChange	Drop certain definitions in `VariableChange` in favor of mathlib's built-in notation: - `VariableChange.id` -> `(1 : VariableChange R)` - `VariableChange.comp C C'` -> `C * C'` - `VariableChange.inv C` -> `C⁻¹` - `W.variableChange C` -> `C • W` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discussion: [#maths > thoughts on elliptic curves @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/thoughts.20on.20elliptic.20curves/near/485467772)	t-algebraic-geometry	180/176	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	4	25	['Multramate', 'acmepjz', 'github-actions']	nobody	1	0-7186 1 hour ago	27-9565 27 days ago	27-9551 27 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
22050	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): Add `SimpleGraph.Preconnected.support_eq_univ`	Co-authored-by: Kyle Miller kmill31415@gmail.com --- Suggested in [zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Way.20ConnectedComponent.20definition.20uses.20Quot.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	44/0	Mathlib/Combinatorics/SimpleGraph/Path.lean	1	4	['b-mehta', 'github-actions', 'urkud']	b-mehta assignee:b-mehta	none	20-63177 20 days ago	20-63190 20 days ago	51-82600 51 days
15906	grunweg author:grunweg	feat: define singular manifolds	These are used to define bordism groups: the `n`th bordism group of a topological space `X` is the space of cobordism classes of all singular manifolds on `X`. --- This PR can best be seen in context in #23138 - which also proves that this definition is usable. (Older branches in this direction are [this branch](https://github.com/leanprover-community/mathlib4/compare/master...MR-bordism-theory) (my first iteration) and [this one](https://github.com/leanprover-community/mathlib4/compare/master...MR-bordism-theory-v2) (second iteration); #23138 has a bit less progress on the boundary data, but pushes bordisms further. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	255/1	Mathlib.lean,Mathlib/Geometry/Manifold/Bordisms.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean	3	69	['YaelDillies', 'alreadydone', 'github-actions', 'grunweg', 'sgouezel']	sgouezel assignee:sgouezel	none	13-40427 13 days ago	23-82875 23 days ago	111-47705 111 days
21944	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Powerseries): Weierstrass preparation for complete local ring	Weierstrass preparation theorem for complete local ring --- - [x] depends on: #21900 - [x] depends on: #22369 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	532/0	Mathlib.lean,Mathlib/RingTheory/WeierstrassPreparation.lean	2	15	['Thmoas-Guan', 'acmepjz', 'github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	none	13-9955 13 days ago	48-69376 1 month ago	55-64607 55 days
22503	Kevew author:Kevew	chore(Nat): Nat factorization multiplicity	Ported lemmas from `Data/Nat/Multiplicity` to into a new file called `Data/Nat/Factorization/Multiplicity`, re-written in terms of `factorization`. Also, I'm new to this so is it fine to have a lemma copied over from another file? Like, I copied over @[simp] theorem Prime.factorization_self {p : ℕ} (hp : Prime p) : p.factorization p = 1 := by simp [hp] from Dat/Nat/Factorization/Basic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	269/15	Mathlib.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Multiplicity.lean,Mathlib/Data/Nat/Multiplicity.lean	4	31	['Kevew', 'Paul-Lez', 'github-actions', 'grunweg']	Kevew assignee:Kevew	none	7-80125 7 days ago	36-27741 1 month ago	46-58090 46 days

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

There are currently no PRs with just an infrastructure-related CI failure. Congratulations!

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
23394	BoltonBailey author:BoltonBailey	chore(Data/Int/WithZero): fix erw	Removing an `erw`. This is my first time doing this, so please tell me if I am doing something wrong here (e.g. should the new lemma be `simp`?). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt awaiting-author	4/2	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Data/Int/WithZero.lean	2	8	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	19-40276 19 days ago	19-40276 19 days ago	2-50897 2 days
23676	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` for localizations and quotients	All these removed instances of `induction'` generate only one subgoal. In some cases `obtain` can be used. The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..08c06520879 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if subgoals.toList.length ≤ 1 then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14270845291/job/40003467676).	tech debt	87/108	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Pointwise/Stabilizer.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/SetTheory/Surreal/Basic.lean	25	7	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	14-26407 14 days ago	14-47449 14 days ago	14-47435 14 days
23324	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` with 5+ variables, part 3	Based on a comment by @apnelson1 on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508274747). The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..29ec70424c7 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if 5 ≤ names.size then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14085064444/job/39446843657).	tech debt	168/119	Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/RingTheory/EssentialFiniteness.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Kaehler/Polynomial.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Polynomial/Ideal.lean,Mathlib/RingTheory/PowerSeries/Order.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/SetTheory/PGame/Order.lean	22	12	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	7-29422 7 days ago	14-53560 14 days ago	22-52936 22 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	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	1	['github-actions']	nobody	1-37942 1 day ago	1-37942 1 day ago	3-29472 3 days
16408	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Order.Nat`	* Move the two `Nat` instances and `bot_eq_zero` to `Order.BoundedOrder.Basic`. We also remove the TODO relating to #13092, as it was tried and it was agreed not to be a good idea. * Move the other two lemmas in `Order.Nat` to `Data.Nat.Find`.	tech debt	35/54	Mathlib/Algebra/IsPrimePow.lean,Mathlib/Data/Finset/Grade.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/SetInterval.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Filter/AtTopBot/Basic.lean,Mathlib/Order/Nat.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/SetTheory/Cardinal/Order.lean	13	8	['Parcly-Taxel', 'YaelDillies', 'github-actions', 'grunweg']	nobody	0-83459 23 hours ago	3-23140 3 days ago	5-58250 5 days
24189	urkud author:urkud	chore(*): rename `Prod.map` lemmas	Also rename some `Prod.fst` and `Prod.snd` lemmas and add 2 dot notation lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt ready-to-merge	103/40	Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Data/Set/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean	11	3	['github-actions', 'j-loreaux', 'urkud']	nobody	0-2556 42 minutes ago	0-2556 42 minutes ago	0-18227 5 hours
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	261-86305 8 months ago	283-67005 9 months ago	0-15202 4 hours
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	243-42690 8 months ago	283-67005 9 months 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	242-52655 7 months ago	243-41802 8 months 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	210-52158 6 months ago	210-52158 6 months 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	79-41864 2 months ago	79-41864 2 months ago	0-9411 2 hours
22603	pechersky author:pechersky	chore(Topology): rename pi family from π to X	Only in files that mentioned such a family, via a script: ``` git grep -e "π : . → Type" --name-only \| rg Topology \| xargs -I{} sed -i -e 's/π/X/g' {} ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology merge-conflict	232/232	Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/LocallyConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/EMetricSpace/Diam.lean,Mathlib/Topology/EMetricSpace/Pi.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Infsep.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/UniformSpace/Ascoli.lean	24	1	['github-actions']	nobody	38-61153 1 month ago	38-61153 1 month ago	5-80034 5 days
22987	BoltonBailey author:BoltonBailey	chore(Logic/Equiv/Basic): split subtype lemmas from file	This PR addresses an instance of the long file linter by separating definitions and lemmas relating to equivalences on subtypes from this file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-logic merge-conflict	568/538	Mathlib.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/Combinatorics/Quiver/Covering.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/Set/SymmDiff.lean,Mathlib/Data/ULift.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Subtype.lean,Mathlib/Order/SymmDiff.lean,MathlibTest/symm.lean	13	5	['BoltonBailey', 'Vierkantor', 'github-actions', 'urkud']	nobody	28-50140 28 days ago	28-50140 28 days ago	4-80383 4 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	18-14484 18 days ago	18-14484 18 days 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	10-81905 10 days ago	11-15074 11 days ago	10-21608 10 days
23211	Parcly-Taxel author:Parcly-Taxel	chore: automatically deprime common `induction'` uses	Replace `induction'` with `induction` for the following targets: ```python rep_dict = {("Nat", "~", 2): [("zero", 0), ("succ", 2)], ("Nat", "strong_induction_on", 1): [("h", 2)], ("Nat", "case_strong_induction_on", 2): [("hz", 0), ("hi", 2)], ("Nat", "le_induction", 2): [("base", 0), ("succ", 3)], ("List", "~", 2): [("nil", 0), ("cons", 3)], ("List", "reverseRecOn", 2): [("nil", 0), ("append_singleton", 3)], ("Multiset", "induction_on", 2): [("empty", 0), ("cons", 3)], ("Finset", "induction", 2): [("empty", 0), ("@insert", 4)], ("Finset", "induction_on", 2): [("empty", 0), ("@insert", 4)], ("MvPolynomial", "induction_on'", 2): [("monomial", 2), ("add", 4)], ("MvPolynomial", "induction_on", 3): [("C", 1), ("add", 4), ("mul_X", 3)]} ``` The script and the data file used can be found [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508218834).	tech debt merge-conflict	2189/1565	Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q1.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/BigOperators.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Computability/Tape.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Complex/Exponential.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Lattice/Pi.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/Fin.lean	283	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	4-4562 4 days ago	4-4564 4 days ago	10-65025 10 days
22754	Parcly-Taxel author:Parcly-Taxel	chore: clear more `docBlame` nolints	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import tech debt merge-conflict awaiting-author documentation	78/64	Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Data/Analysis/Topology.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Basis.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/PrimeIdeal.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/WittVector/Isocrystal.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/Order/Hom/Esakia.lean,scripts/nolints.json	28	9	['Parcly-Taxel', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	0-49359 13 hours ago	0-49361 13 hours ago	0-3406 56 minutes

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
8047	faenuccio author:faenuccio	refactor(Util/Delaborators): remove `scoped` from delabPi'	Following [this discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Notation.20for.20Pi.20type) on Zulip, remove `scoped` from the delaborator of `Pi` so that in the infoview the `Pi` symbol appears again.	awaiting-zulip t-meta	1/1	Mathlib/Util/Delaborators.lean	1	3	['eric-wieser', 'github-actions', 'joneugster']	nobody	32-58965 1 month ago	32-58965 1 month ago	503-61537 503 days
23866	kim-em author:kim-em	chore: remove `[AtLeastTwo n]` hypothesis from the `NatCast` to `OfNat` instance	This PR observes that we can change ``` instance (priority := 100) instOfNatAtLeastTwo {n : ℕ} [NatCast R] [Nat.AtLeastTwo n] : OfNat R n ``` to ``` instance (priority := 100) instOfNatAtLeastTwo {n : ℕ} [NatCast R] : OfNat R n ``` with minimal fall-out. A follow-up PR #23867 then observes that we can remove nearly all the `[Nat.AtLeastTwo n]` hypotheses in Mathlib. This is slightly dangerous -- it does make it more likely that we'll generate non-defeq instances, but it appears to happen very rarely. However, it will make life slightly easier for something Leo and I are trying to do with `grind` and Grobner bases (we'd like to be able to assume types we consume have `[∀ n, OfNat α n]`, which is possible with this change, but not without...). Zulip thread: [#PR reviews > #23866 and #23867, removing most `[Nat.AtLeastTwo n]` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2323866.20and.20.2323867.2C.20removing.20most.20.60.5BNat.2EAtLeastTwo.20n.5D.60/near/511157297)	awaiting-zulip	21/26	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean	3	3	['eric-wieser', 'github-actions', 'urkud']	nobody	9-47563 9 days ago	9-47652 9 days ago	0-23929 6 hours
24083	Parcly-Taxel author:Parcly-Taxel	feat: the `longFileHard` linter	@kim-em [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/long.20files/near/510548946): > Yes, we don't have a sustainable mechanism that will prevent long files creeping back, unless when we reach "no long file", we turn it into an non-overridable error...! > > It would be great to have such a mechanism, of course, because I agree, of course, that this would be annoying to contributors (and doubly annoying to reviewers if they had to remind contributors not to "compress" things).	awaiting-zulip t-linter	72/1	Mathlib/Tactic/Linter/Style.lean,MathlibTest/LongFile.lean,lakefile.lean	3	2	['github-actions', 'grunweg']	nobody	3-58314 3 days ago	3-58314 3 days ago	0-5347 1 hour
19872	YaelDillies author:YaelDillies	chore(GroupTheory/Index): rename `relindex` to `relIndex`	--- - [x] depends on: #24044 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT awaiting-zulip t-algebra label:t-algebra$	214/137	Mathlib/FieldTheory/Relrank.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/IndexNormal.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean	13	18	['Ruben-VandeVelde', 'TwoFX', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'madvorak', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	3-121 3 days ago	3-121 3 days ago	114-79171 114 days
23721	YaelDillies author:YaelDillies	chore: rename `AlgebraCat` to `Alg`	and its friends too. The new names: * are shorter * match `Grp`, `CommGrp` * are what people would write on paper The existing name is too much of a mouthful to be usefully included in declaration names. For example, [`BialgebraCat.hasForgetToAlgebra`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Category/BialgebraCat/Basic.html#BialgebraCat.hasForgetToAlgebra) wasn't named `BialgebraCat.hasForgetToAlgebraCat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	433/433	Mathlib.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/Alg/Basic.lean,Mathlib/Algebra/Category/Alg/Limits.lean,Mathlib/Algebra/Category/Alg/Monoidal.lean,Mathlib/Algebra/Category/Alg/Symmetric.lean,Mathlib/Algebra/Category/AlgebraCat/Symmetric.lean,Mathlib/Algebra/Category/Bialg/Basic.lean,Mathlib/Algebra/Category/Bialg/Monoidal.lean,Mathlib/Algebra/Category/Coalg/Basic.lean,Mathlib/Algebra/Category/Coalg/ComonEquivalence.lean,Mathlib/Algebra/Category/Coalg/Monoidal.lean,Mathlib/Algebra/Category/HopfAlg/Basic.lean,Mathlib/Algebra/Category/HopfAlg/Monoidal.lean,Mathlib/Algebra/Category/Ring/Under/Basic.lean,Mathlib/CategoryTheory/Monoidal/Hopf_.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/LinearAlgebra/CliffordAlgebra/CategoryTheory.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Monoidal.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Symmetric.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,MathlibTest/CategoryTheory/ConcreteCategory/Alg.lean,docs/overview.yaml	27	8	['YaelDillies', 'b-mehta', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	2-24586 2 days ago	2-24586 2 days ago	10-35940 10 days
23974	fbarroero author:fbarroero	fix: change file name for consistency	We change the name of the file `Mathlib.Algebra.Polynomial.ofFn` to `Mathlib.Algebra.Polynomial.OfFn` for consistency. For instance, the file containing `List.ofFn` is called `Init.Data.List.OfFn`. Zulip discussion [here](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2323974.20Change.20file.20name.20to.20CamelCase/with/512739476) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip easy	1/1	Mathlib.lean,Mathlib/Algebra/Polynomial/OfFn.lean	2	3	['github-actions', 'grunweg', 'riccardobrasca']	nobody	1-65726 1 day ago	2-2885 2 days ago	4-60671 4 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	215-12073 7 months ago	215-34048 7 months ago	119-10687 119 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	167-52192 5 months ago	193-40714 6 months ago *	0-0 0 seconds *
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) --- [![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$	107/114	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/Definitions.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/Fintype.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	27	11	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'urkud']	nobody	154-76507 5 months ago	154-76507 5 months ago	0-66650 18 hours
17623	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): add some lemmas	Some lemmas in `Algebra.Order.GroupWithZero.Unbundled` have incorrect or unsatisfactory names, or assumptions that can be omitted using `ZeroLEOneClass`. The lemmas added in this PR are versions of existing lemmas that use the correct or better name or `ZeroLEOneClass` to omit an assumption. The original lemmas will be deprecated in #17593. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `mul_le_one_left₀` \| `Left.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_le_of_lt_left₀` (`0 ≤ ·` version) / `mul_lt_one_of_le_of_lt_of_pos_left` \| `Left.mul_lt_of_le_of_lt_one_of_pos` \| \| `mul_lt_one_of_lt_of_le_left₀` \| `Left.mul_lt_of_lt_of_le_one_of_nonneg` \| \| `mul_le_one_right₀` \| `Right.mul_le_one_of_le_of_le` \| \| `mul_lt_one_of_lt_of_le_right₀` (`0 ≤ ·` version) / `mul_lt_one_of_lt_of_le_of_pos_right` \| `Right.mul_lt_one_of_lt_of_le_of_pos` \| \| `mul_lt_one_of_le_of_lt_right₀` \| `Right.mul_lt_one_of_le_of_lt_of_nonneg` \| The following lemmas use `ZeroLEOneClass`. \| New name \| Old name \| \|-------------------------\|-------------------------\| \| `(Left.)one_le_mul₀` \| `Left.one_le_mul_of_le_of_le` \| \| `Left.one_lt_mul_of_le_of_lt₀` \| `Left.one_lt_mul_of_le_of_lt_of_pos` \| \| `Left.one_lt_mul_of_lt_of_le₀` \| `Left.lt_mul_of_lt_of_one_le_of_nonneg` / `one_lt_mul_of_lt_of_le` (still there) \| \| `(Left.)one_lt_mul₀` \| \| \| `Right.one_le_mul₀` \| `Right.one_le_mul_of_le_of_le` \| \| `Right.one_lt_mul_of_lt_of_le₀` \| `Right.one_lt_mul_of_lt_of_le_of_pos` \| \| `Right.one_lt_mul_of_le_of_lt₀` \| `Right.one_lt_mul_of_le_of_lt_of_nonneg` / `one_lt_mul_of_le_of_lt` (still there) / `one_lt_mul` (still there) \| \| `Right.one_lt_mul₀` \| `Right.one_lt_mul_of_lt_of_lt` \| --- Split from #17593. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	149-71723 4 months ago	149-71723 4 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	28	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	5-55729 5 days ago	5-55730 5 days ago	29-60989 29 days

PRs with just a merge conflict

Number	Author	Title	Description	Labels	+/-	Modified files (first 100)	📝	💬	All users who commented or reviewed	Assignee(s)	Updated	Last status change	total time in review
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	261-86305 8 months ago	329-52297 10 months 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	261-86303 8 months ago	283-67005 9 months ago	64-12826 64 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-algebra merge-conflict label:t-algebra$	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	261-86302 8 months ago	295-74219 9 months 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	261-86302 8 months ago	295-74204 9 months ago	0-0 0 seconds
7875	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'Parcly-Taxel', 'jcommelin', 'leanprover-bot']	nobody	261-86301 8 months ago	283-67005 9 months 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	261-86301 8 months ago	283-67005 9 months 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	261-86300 8 months ago	283-67005 9 months 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	261-86300 8 months ago	283-67005 9 months 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	247-79845 8 months ago	247-79845 8 months ago	53-73442 53 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/)	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	243-42869 8 months ago	273-64629 8 months ago	2-10495 2 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	243-42690 8 months ago	283-67005 9 months ago	1-84718 1 day
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	4	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	243-42663 8 months ago	293-78076 9 months ago	0-0 0 seconds
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	243-42549 8 months ago	283-67005 9 months 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	243-42448 8 months ago	283-67005 9 months 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	242-63602 7 months ago	247-79844 8 months 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	210-52158 6 months ago	210-52158 6 months 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	201-14541 6 months ago	201-14541 6 months 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	191-43346 6 months ago	283-67005 9 months 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	164-10007 5 months ago	164-10007 5 months 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	164-8910 5 months ago	164-8910 5 months ago	18-19513 18 days
18806	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `MulEquivClass`	--- - [x] depends on: #18809 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	84/72	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	15	6	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	151-52588 5 months ago	151-52588 5 months ago	4-31794 4 days
17672	urkud author:urkud	refactor: turn `IsTorsionFree` into a typeclass	Rename `Monoid.IsTorsionFree` to `IsMulTorsionFree` and turn it into a typeclass. Generalize some lemmas from (linear) ordered groups to `IsMulTorsionFree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	256/130	Mathlib.lean,Mathlib/Algebra/CharZero/Lemmas.lean,Mathlib/Algebra/Group/IsTorsionFree/Basic.lean,Mathlib/Algebra/Group/IsTorsionFree/Defs.lean,Mathlib/Algebra/Group/IsTorsionFree/Instances.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Data/Nat/Prime/Pow.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/Order/Min.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/Instances/ZMultiples.lean	21	12	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'urkud']	nobody	150-4665 4 months ago	150-41432 4 months ago	24-67723 24 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	143-73162 4 months ago	143-73162 4 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	141-49239 4 months ago	141-49239 4 months ago	4-60621 4 days
18756	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	130-14908 4 months ago	130-14908 4 months ago	31-75259 31 days
18912	b-mehta author:b-mehta	feat(SpecialFunctions/Log): more continuity and limits for logb	Continuation from #18621. From the ExponentialRamsey project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	144/17	Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Data/Set/Pointwise/Interval.lean,Mathlib/Topology/Algebra/Order/Field.lean	3	9	['b-mehta', 'dupuisf', 'github-actions', 'j-loreaux']	nobody	129-59422 4 months ago	129-59422 4 months ago	1-18352 1 day
19046	j-loreaux author:j-loreaux	feat: define class `SemigroupAction`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	34/25	Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.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/Polynomial/Laurent.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean	11	7	['alreadydone', 'github-actions', 'j-loreaux', 'leanprover-bot', 'urkud']	nobody	126-62792 4 months ago	126-62793 4 months ago	6-21105 6 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	123-65321 4 months ago	123-65324 4 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	95-62114 3 months ago	95-62114 3 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	93-49144 3 months ago	93-49144 3 months ago	76-67978 76 days
19091	Vierkantor author:Vierkantor	chore(Algebra/MonoidAlgebra): split Defs.lean further	This PR further splits the big file `MonoidAlgebra/Defs.lean` to focus on the ring structure on (`Add`)`MonoidAlgebra`. The following files have been split off: * `MonoidAlgebra/Lift.lean`: definition of `liftNC` * `MonoidAlgebra/MapDomain.lean`: definition of `mapDomain` * `MonoidAlgebra/Module.lean`: module structure (and some submodule results) * `MonoidAlgebra/Opposite.lean`: results on the `MulOpposite` ring structure I also changed one proof about scalar multiplication by natural numbers, so that it wouldn't need a full on module structure on `Finsupp`. This required adding a pair of lemmas on the definition of multiplying `Finsupp`s by natural numbers. --- - [ ] depends on: #19087 - [ ] depends on: #19205 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	883/560	Mathlib.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/Data/Finsupp/Defs.lean,Mathlib/RingTheory/Polynomial/Opposites.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	92-70661 3 months ago	92-70661 3 months ago	2-72196 2 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	80-73401 2 months ago	80-73401 2 months ago	27-43617 27 days
21948	ChrisHughes24 author:ChrisHughes24	feat(ModelTheory): Formula.iSup and iInf	--- This was a slightly controversial addition discussed in #20175 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict	24/7	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	5	['YaelDillies', 'github-actions']	nobody	60-62861 2 months ago	60-62861 2 months ago	1-18127 1 day
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	59-11143 2 months ago	59-11143 2 months ago	52-25108 52 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	54-56379 1 month ago	54-56379 1 month ago	27-75210 27 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/)	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	48-52708 1 month ago	283-67005 9 months ago	7-68358 7 days
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 furhter 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	46-59484 1 month ago	173-75992 5 months ago	129-57991 129 days
21339	vihdzp author:vihdzp	fix(Data/List/Lex): remove duplicate `List.LE` instance	Mathlib currently duplicates the Lean core instance for `≤` in lists in an incompatible way. We delete this duplicate instance. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Two.20.60List.2ELE.60.20instances.3F/near/497241115). --- This is a very quick and dirty fix. Core Lean provides all of the theorems we need to prove `≤` forms a linear order, but it provides them in terms of `Std` relation typeclasses which currently see no use in Mathlib. I've added the instances that were required to get the list theorems working. In the future, we really ought to unify the core and Mathlib relation typeclasses. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	24/22	Mathlib/Data/List/Lex.lean,Mathlib/Data/String/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean	3	1	['github-actions']	nobody	46-55271 1 month ago	46-55271 1 month ago	16-65973 16 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	44-59422 1 month ago	44-59422 1 month ago	16-76141 16 days
22603	pechersky author:pechersky	chore(Topology): rename pi family from π to X	Only in files that mentioned such a family, via a script: ``` git grep -e "π : . → Type" --name-only \| rg Topology \| xargs -I{} sed -i -e 's/π/X/g' {} ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology merge-conflict	232/232	Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/LocallyConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/EMetricSpace/Diam.lean,Mathlib/Topology/EMetricSpace/Pi.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Infsep.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/UniformSpace/Ascoli.lean	24	1	['github-actions']	nobody	38-61153 1 month ago	38-61153 1 month ago	5-80034 5 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	32-81677 1 month ago	32-81677 1 month ago	10-48025 10 days
21856	vihdzp author:vihdzp	chore(SetTheory/Cardinal/Basic): generalize universes of `sum_le_iSup_lift`	We prove a more general version of the lemma which talks about families `ι → Cardinal.{v}` with `Small.{v} ι`, rather than just families `f : ι → Cardinal.{max u v}` with `ι : Type v`. We keep the old version, as it's seemingly more useful under common circumstances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	16/10	Mathlib/SetTheory/Cardinal/Basic.lean	1	6	['b-mehta', 'github-actions', 'vihdzp']	nobody	31-72911 1 month ago	31-72911 1 month ago	32-26420 32 days
21751	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/Arithmetic): rework `Ordinal.pred` API	This PR does the following: - give a simpler definition of `Ordinal.pred` - replace `¬ ∃ a, o = succ a` and `∀ a, o ≠ succ a` by `IsSuccPrelimit o` throughout - improve theorem names --- There's a legitimate question of whether we even want `Ordinal.pred` (see [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Ordinal.2Epred)) but this should be a good change in the meanwhile regardless. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge merge-conflict	102/67	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	2	12	['YaelDillies', 'github-actions', 'vihdzp']	nobody	29-15560 29 days ago	29-15560 29 days ago	36-50134 36 days
22027	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPoint); review `Ordinal.nfp` API	This PR does the following: - add `iff` variants of various theorems, renaming some in the process - weaken some assumptions slightly - golf throughout --- - [x] depends on: #22017 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	64/61	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	13-39429 13 days ago	16-6389 16 days ago	43-68322 43 days
22966	alreadydone author:alreadydone	feat(RingTheory): rank of rational function field extension	+ `IsAlgebraic/IsIntegral R S` + `IsPushout R S R' S'` ⇒ `IsAlgebraic/IsIntegral R' S'` (for the "IsAlgebraic" version we currently need to assume `NoZeroDivisor R'` and `FaithfulSMul R R'` (i.e. `Injective (algebraMap R R')`) + `IsAlgebraic R S` + `IsFractionRing R R'` + `IsFractionRing S S'` ⇒ `IsPushout R S R' S'` (need to assume `FaithfulSMul R S` + `NonZeroDivisors S`) As consequences, we have `rank (f R) (f S) = rank R S` for `f = FractionRing (Polynomial ·)` or `FractionRing (MvPolynomial _ ·)` assuming `IsAlgebraic R S` + `IsDomain S` + `FaithfulSMul R S`. (For `f = Polynomial` or `MvPolynomial _`, `NoZeroDivisors R` is enough by #23095.) --- - [x] depends on: #23095 - [x] depends on: #23096 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	270/46	Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	5	10	['Louddy', 'alreadydone', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	12-46845 12 days ago	12-46845 12 days ago	14-3730 14 days
13861	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`. 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 do some light refactoring for succinctness, and put this any related preexisting lemmas in a new file to not trigger the linter. Needed by #12664 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	204/62	Mathlib.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Option.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean	6	1	['github-actions']	nobody	12-38014 12 days ago	12-38014 12 days ago	12-6613 12 days
21858	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 function 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. --- - [ ] depends on: #21860 - [ ] depends on: #21970 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	216/262	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Enum.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-37476 12 days ago	12-37478 12 days ago	0-1601 26 minutes
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	12-35191 12 days ago	12-35191 12 days 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	10-81905 10 days ago	11-15074 11 days ago	10-21608 10 days
21573	lambda-fairy author:lambda-fairy	feat(Computability): regular languages are closed under reversal	This PR proves that regular languages are closed under reversal. It works by reversing the transitions in the NFA, and proving that the resulting automaton matches the reversed language. The argument proceeds by induction on the input word, ensuring that, at each character, the state sets for the forward and reverse automaton correspond to each other. I also clean up the existing NFA module, which includes making the `M` argument implicit by default. I can revert that if it's controversial. Thank you @Rob23oba for their help with the induction proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict	75/7	Mathlib/Computability/NFA.lean	1	8	['github-actions', 'lambda-fairy', 'madvorak', 'meithecatte', 'tristan-f-r']	nobody	10-31535 10 days ago	44-73786 1 month ago	24-86139 24 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	9-67824 9 days ago	9-67825 9 days 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	9-67822 9 days ago	9-67824 9 days ago	43-83249 43 days
21673	erdOne author:erdOne	feat: `∑ z ∈ L, ‖z - x‖⁻ʳ` converges for lattices `L`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	329/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Disjoint.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Order/Disjointed.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'xroblot']	nobody	9-8820 9 days ago	9-8822 9 days ago	27-73279 27 days
23670	Vierkantor author:Vierkantor	feat(Tactic/Linter): one option for all Mathlib linters	This is intended to make downstream projects easier to maintain and keep up to Mathlib standards, by having one option `linter.mathlibStandard` control all the linters that we previously had to enable one by one in the lakefile. This is accomplished by introducing a new check `Mathlib.getLinterValue` that takes the `linter.mathlibStandard` option into account. If that option is set to true, it checks if this is one of the Mathlib standard linters, and enables the linter if so. I also considered a few ways of implementing this feature by setting options automatically. But I couldn't get any to work without modifying Lean itself: * an `initialize` command doesn't get access to the options in the current file (since it runs in IO rather than CoreM), * hooking the `runLinters` step of elaboration doesn't work because each linter restores the state (including options) after running. A drawback of the current approach is that a linter defined upstream of Mathlib cannot be enabled this way. There is no such linter currently, and we can fall back to the previous `lakefile` approach if that happens. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	135/47	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Attr.lean,Mathlib/Tactic/Linter/DeprecatedSyntaxLinter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/DocPrime.lean,Mathlib/Tactic/Linter/DocString.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,MathlibTest/MathlibStandardLints.lean,lakefile.lean,scripts/lint-style.lean	22	4	['Vierkantor', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	9-8098 9 days ago	9-8100 9 days ago	5-52291 5 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	4-6388 4 days ago	4-6390 4 days ago	55-52030 55 days
23211	Parcly-Taxel author:Parcly-Taxel	chore: automatically deprime common `induction'` uses	Replace `induction'` with `induction` for the following targets: ```python rep_dict = {("Nat", "~", 2): [("zero", 0), ("succ", 2)], ("Nat", "strong_induction_on", 1): [("h", 2)], ("Nat", "case_strong_induction_on", 2): [("hz", 0), ("hi", 2)], ("Nat", "le_induction", 2): [("base", 0), ("succ", 3)], ("List", "~", 2): [("nil", 0), ("cons", 3)], ("List", "reverseRecOn", 2): [("nil", 0), ("append_singleton", 3)], ("Multiset", "induction_on", 2): [("empty", 0), ("cons", 3)], ("Finset", "induction", 2): [("empty", 0), ("@insert", 4)], ("Finset", "induction_on", 2): [("empty", 0), ("@insert", 4)], ("MvPolynomial", "induction_on'", 2): [("monomial", 2), ("add", 4)], ("MvPolynomial", "induction_on", 3): [("C", 1), ("add", 4), ("mul_X", 3)]} ``` The script and the data file used can be found [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508218834).	tech debt merge-conflict	2189/1565	Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q1.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/BigOperators.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Computability/Tape.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Complex/Exponential.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Lattice/Pi.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/Fin.lean	283	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	4-4562 4 days ago	4-4564 4 days ago	10-65025 10 days
13795	FR-vdash-bot author:FR-vdash-bot	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	35	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	3-85103 3 days ago	3-85105 3 days ago	52-31623 52 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	3-37681 3 days ago	251-76011 8 months ago	4-79214 4 days
23621	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	2-30674 2 days ago	unknown	unknown
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	1-41784 1 day ago	1-41784 1 day ago	1-17369 1 day
22153	smmercuri author:smmercuri	feat: weak approximation theorems for infinite places of a number field	The number field $K$ is dense in $\prod_v (K, v)$ and in the infinite adele ring $\prod_v K_v$, where $v$ ranges over the infinite places, $(K, v)$ denotes $K$ equipped with the topology induced by $v$, and $K_v$ is the completion of $K$ at $v$. --- - [ ] depends on #22147 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-analysis t-number-theory merge-conflict label:t-algebra$	576/2	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Logic/Pairwise.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	1	['github-actions']	nobody	1-41604 1 day ago	1-41604 1 day ago	11-23591 11 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	256-61317 8 months ago	261-54982 8 months 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	246-78693 8 months ago	246-78693 8 months ago	6-38745 6 days
11207	luigi-massacci author:luigi-massacci	feat(Topology/MetricSpace): Add new file with type of Katetov maps	add a type of Katetov maps (one point extensions of a metric) and related notation and FunLike coercions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology WIP	138/0	Mathlib.lean,Mathlib/Topology/MetricSpace/Katetov.lean,docs/references.bib	3	16	['fpvandoorn', 'jcommelin', 'kim-em', 'luigi-massacci', 'urkud']	nobody	242-63070 7 months ago	344-65155 11 months ago	26-83567 26 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	242-62945 7 months ago	246-75871 8 months 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	229-38437 7 months ago	260-84096 8 months ago	7-3203 7 days
16773	arulandu author:arulandu	feat(Probability/Distributions): formalize Beta distribution	Formalize Beta distribution, using Gamma distribution as a reference. Added real-valued beta wrapper, in the manner of gamma. Thanks to @EtienneC30 for help with casting real <-> complex. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability awaiting-author	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	48	['EtienneC30', 'arulandu', 'github-actions', 'vihdzp']	arulandu assignee:arulandu	210-85054 6 months ago	215-81772 7 months ago	1-21124 1 day
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	20	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	206-63898 6 months ago	206-64016 6 months ago	26-39463 26 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/)	t-computability new-contributor awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	13	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions']	nobody	205-75507 6 months ago	206-62436 6 months ago	45-84611 45 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	178-57439 5 months ago	178-57439 5 months ago	31-44440 31 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 please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	7	['chrisflav', 'jcommelin']	nobody	170-63057 5 months ago	170-63057 5 months ago	9-22007 9 days
15809	archiebrowne author:archiebrowne	feat(RingTheory/MvPolynomial/Ideal): introduce new lemmas about MvPolynomial Ideals	Four new lemmas about MvPolynomialIdeals `sub_span_span_sub`, `span_eq_iff_basis_sub`, `mem_basis_mem_span`, `mem_span_exists_dvd_mem_basis`. --- [![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$	38/0	Mathlib/RingTheory/MvPolynomial/Ideal.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	151-60223 5 months ago	206-62143 6 months ago	41-7533 41 days
15649	TpmKranz author:TpmKranz	feat(Computability): introduce Generalised NFA as bridge to Regular Expression	Lays the groundwork for a proof of equivalence of NFA and RE, w.r.t. described language. Actual connection to NFA comes later, after the groundwork for the opposite direction has been laid. Second chunk of #12648 --- - [x] depends on: #15647 [Data.FinEnum.Option unchanged since then] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	5	['github-actions', 'mathlib4-dependent-issues-bot', 'trivial1711']	nobody	132-14819 4 months ago	132-14819 4 months ago	23-54870 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 WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	10	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions']	nobody	121-42281 4 months ago	121-77390 4 months ago	0-34081 9 hours
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	88-81974 2 months ago	88-81974 2 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	88-68739 2 months ago	89-69692 2 months ago	2-77310 2 days
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	56	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'madvorak', 'niklasmohrin']	nobody	67-3365 2 months ago	67-3365 2 months ago	86-21072 86 days
19582	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `OfMulDistribMulAction.equivH2`	Mainly defines: - `structure GroupExtension.OfMulDistribMulAction N G [MulDistribMulAction G N]`: group extensions of `G` by `N` where the multiplicative action of `G` on `N` is the conjugation - `structure GroupExtension.OfMulDistribMulActionWithSection N G [MulDistribMulAction G N]`: group extensions with specific choices of sections - `def GroupExtension.OfMulDistribMulAction.equivH2`: a bijection between the equivalence classes of group extensions and $H^2 (G, N)$ - [x] depends on: #20802 (split PR: contains changes to the `Defs` file) - [x] depends on: #20998 (split PR: mainly adds the `Basic` file) - [ ] depends on: #21837 (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 blocked-by-other-PR label:t-algebra$	736/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	3	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	64-46680 2 months ago	64-50454 2 months ago	43-23183 43 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/)	t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	59-24515 2 months ago	59-24528 2 months ago	59-26324 59 days
13442	dignissimus author:dignissimus	feat: mabel tactic for multiplicative abelian groups	Mabel tactic for multiplicative abelian groups (#10361) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor 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	58-34502 1 month ago	63-16098 2 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	58-33581 1 month ago	58-33581 1 month 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	52-34777 1 month ago	52-35904 1 month ago	0-1528 25 minutes
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	27	['github-actions', 'madvorak', 'shetzl']	nobody	51-62097 1 month ago	51-83366 1 month ago	51-83418 51 days
22390	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)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	112/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	9	['YunkaiZhang233', 'github-actions', 'joelriou']	nobody	46-75410 1 month ago	49-70882 1 month ago	0-6513 1 hour
8167	sebzim4500 author:sebzim4500	feat: Add new `grw` tactic for rewriting using inequalities.	feat: Add new `grw` tactic for rewriting using inequalities. Co-authored-by: @hrmacbeth, @digama0 --- - [x] depends on: #8796 ```lean example (x y z w : ℝ) (h₁ : x < z) (h₂ : w ≤ y + 4) (h₃ : Real.exp z < 5 * w) : Real.exp x < 5 * (y + 4) := by grw [h₁, ← h₂] exact h₃ ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta modifies-tactic-syntax	552/2	Mathlib.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRW.lean,Mathlib/Tactic/GRW/Core.lean,Mathlib/Tactic/GRW/Lemmas.lean,MathlibTest/GRW.lean,scripts/noshake.json	9	53	['Vierkantor', 'digama0', 'eric-wieser', 'fpvandoorn', 'github-actions', 'hrmacbeth', 'kim-em', 'leanprover-community-mathlib4-bot', 'sebzim4500']	nobody	40-61281 1 month ago	41-48250 1 month ago	72-10501 72 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 WIP	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	38-78396 1 month ago	39-42635 1 month ago	0-0 0 seconds
22948	pelicanhere author:pelicanhere	feat(Algebra/DirectSum): morphism of directsum decomposition	Define morphism of directsum decomposition, which would be later used in defineing graded ring hom. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	68/0	Mathlib/Algebra/DirectSum/Decomposition.lean	1	1	['github-actions']	nobody	34-68808 1 month ago	34-81452 1 month ago	34-81498 34 days
22196	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	In this PR, we implement a new tactic that reduces expressions in a `LieRing` to a normal form and checks whether they are equal, and a command which reduces the expression and displays the normal form. The implementation of this tactic imitates the `ring` tactic, using the `Qq` package to implement a specific reduction algorithm, following the theory of Hall sets and Lyndon words. A reference for the algorithm can be found at, for example, [here](https://personal.math.ubc.ca/~cass/research/pdf/Free.pdf). This project is the result of a workshop at Peking University, and @siddhartha-gadgil has helped us a lot on understanding the concepts in metaprogramming. Edit: The changes are reverted to a point where only `AtomM` is used. Co-authored-by: @Thmoas-Guan <2300010733@stu.pku.edu.cn> @yhtq <2100012990@stu.pku.edu.cn> @Blackfeather007 <2100017455@stu.pku.edu.cn> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	821/0	Mathlib.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	7	5	['github-actions', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	nobody	34-62343 1 month ago	55-18727 1 month ago	55-18722 55 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	32-82324 1 month ago	32-82324 1 month ago	20-81771 20 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/)	t-computability new-contributor awaiting-author	114/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	56	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'urkud']	EtienneC30 assignee:EtienneC30	32-59630 1 month ago	32-59630 1 month ago	48-67492 48 days
18091	tukamilano author:tukamilano	feat: Hoeffding's lemma	Formalize Hoeffding's lemma using the property of cumulant. Co-authored-by: Yuma Mizuno [mizuno.y.aj@gmail.com](mailto:mizuno.y.aj@gmail.com) --- - [x] depends on: #20151	large-import new-contributor t-measure-probability awaiting-author	339/0	Mathlib.lean,Mathlib/Probability/Hoeffding.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/MGFAnalytic.lean,docs/references.bib	5	55	['RemyDegenne', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'tukamilano', 'yuma-mizuno']	tukamilano assignee:tukamilano	29-73940 29 days ago	29-73948 29 days ago	1-58489 1 day
22069	Raph-DG author:Raph-DG	feat(LinearMap): Added lemmas relating kernels of linear maps to Submodule.map	Added the lemma ne_map_or_ne_kernel_inter_of_lt stating that if A < B as submodules, then for any linear map f, `ker f ⊓ A ≠ ker f ⊓ B ∨ Submodule.map f A ≠ Submodule.map f B`. We also prove the corollaries ker_inter_mono_of_map_eq and map_mono_of_ker_inter_eq. Co-authored-by: Raphael Douglas Giles (raphaeldouglasgiles@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	28/0	Mathlib/LinearAlgebra/Span/Basic.lean	1	14	['Paul-Lez', 'Raph-DG', 'github-actions', 'j-loreaux']	nobody	24-61383 24 days ago	24-61400 24 days ago	58-46501 58 days
22884	tannerduve author:tannerduve	feat(Computability/TuringDegrees): define oracle computability and Turing degrees	### Description Define a model of oracle computability, introducing Turing reducibility (`≤ᵀ`), Turing equivalence (`≡ᵀ`), and Turing degrees as the quotient under Turing equivalence. - `RecursiveIn O f`: A function `f` is recursive in a set of oracles `O` if it can be computed using `O` via basic operations (zero, successor, pairing, composition, primitive recursion, and μ-recursion). - `TuringReducible`: The relation that `f` is recursive in `{g}`, i.e., `f ≤ᵀ g`. - `TuringEquivalent`: A relation defining Turing equivalence between partial functions. - `TuringDegree`: The set of equivalence classes under `TuringEquivalent`, forming a partially ordered structure. Additionally: - Prove that `TuringReducible` is a preorder (reflexive, transitive). - Show that `TuringEquivalent` is an equivalence relation. - Establish that partial recursive functions correspond to functions recursive in the empty oracle set. This formalization follows classical recursion theory (Odifreddi, Soare) and extends previous work by Carneiro. ### Breaking Changes None. ### Dependencies None.	t-computability new-contributor	221/0	Mathlib.lean,Mathlib/Computability/TuringDegrees.lean	2	8	['github-actions', 'tannerduve', 'tristan-f-r']	nobody	23-35526 23 days ago	37-52008 1 month ago	37-52055 37 days
22137	grunweg author:grunweg	feat: `IsEmbedding.sumElim_of_separatingNhds`	Characterise when the `Sum.elim` of two inducing maps resp. embeddings is an embedding, and deduce that the ranges of the two maps lying in separated neighbourhoods suffices. This will be used in my bordism theory project. ------------ - [x] depends on: #22827 (for breaking the import cycle) - [ ] depends on: #22969 - [ ] depends on: #22964 - [ ] depends on: #23371 (for the previous PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author blocked-by-other-PR	209/10	Mathlib/Data/Set/Image.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Topology/Constructions/SumProd.lean	4	22	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	22-65311 22 days ago	22-65314 22 days 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 blocked-by-other-PR	146/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/UniformSpace/Compact.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-51379 22 days ago	23-34397 23 days ago	0-0 0 seconds
22635	Kiolt author:Kiolt	feat: submonoid of pairs with quotient in a submonoid	This submonoid is part of the definition of toric ideals. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-algebra label:t-algebra$	36/0	Mathlib.lean,Mathlib/GroupTheory/MonoidLocalization/DivPairs.lean	2	10	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	17-80464 17 days ago	17-80517 17 days ago	43-67450 43 days
22355	xyzw12345 author:xyzw12345	feat(Algebra/RingQuot): Some lemmas about `RingQuot.mkAlgHom` and `RingQuot.mkRingHom`	This PR provides a few basic lemmas about `RingQuot.mkRingHom` and `RingQuot.mkAlgHom`. These lemmas are about when are two elements mapped to the same one under these two maps, and they correspond to the lemma `Quot.eq`. PR #22279 depends on these lemmas. --- [![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$	16/0	Mathlib/Algebra/RingQuot.lean	1	13	['Paul-Lez', 'erdOne', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	nobody	17-9157 17 days ago	17-82880 17 days ago	32-33842 32 days
22279	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	In this PR, we defined the concept of a homogeneous relation and proved some properties about homogeneous relations. The main result of this PR is showing that taking `RingQuot` by a homogeneous relation can give a graded structure on the quotient ring. This result can be used to define graded structures on rings obtained using `RingQuot`, e.g. the Symmetric Algebra defined in #21539 can be verified to have such a structure. Co-authored-by: Zhixuan Dai @atstarrysky <22300180006@m.fudan.edu.cn> Yiming Fu @pelicanhere Zhenyan Fu @pumpkin678 Raphael Douglas Giles @Raph-DG Jiedong Jiang @jjdishere - [x] depends on: #22354 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	455/0	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/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousRelation.lean	8	6	['Paul-Lez', 'github-actions', 'mathlib4-dependent-issues-bot', 'ocfnash', 'xyzw12345']	nobody	17-8647 17 days ago	17-8650 17 days ago	18-40441 18 days
21985	FernandoChu author:FernandoChu	feat(CategoryTheory): the Grothendieck construction is prefibered	Adds a `isPreFibered` instance for the Grothendieck construction. Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	55/0	Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	2	14	['chrisflav', 'github-actions']	nobody	16-57767 16 days ago	16-57772 16 days ago	8-4256 8 days
22639	b-reinke author:b-reinke	feat(Mathlib/GroupTheory/FreeGroup): theory of (cyclically) reduced words	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR defines in the new file `Mathlib/GroupTheory/FreeGroup/ReducedWords.lean` some extra lemmas for free groups, in particular about (cyclically) reduced words. ## Main declarations * `FreeGroup.Red.reduced`: the predicate for reduced words * `FreeGroup.Red.cyclicallyReduced`: the predicate for cyclically reduced words ## Main statements * `FreeGroup.infinite_order`: nontrivial elements of a free group have infinite order * `FreeGroup.zpow_left_injective`: taking n-th powers is an injective function on the free group Co-authored-by: Amir Livne Bar-on - [ ] depends on: #23366 - [ ] depends on: #23367 - [ ] depends on: #23368 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	429/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-45585 12 days ago	22-77033 22 days ago	20-75471 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 awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	2	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	11-64840 11 days ago	21-59317 21 days ago	9-59130 9 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	11-11250 11 days ago	11-11250 11 days ago	51-9403 51 days
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	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	6	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg']	b-mehta assignee:b-mehta	10-63307 10 days ago	10-63328 10 days ago	32-54009 32 days
22018	maddycrim author:maddycrim	feat(RingTheory/Localization/Pi): localization of a finite direct product where each semiring in product has maximal nilradical is a projection	For noncomputable def `surjectivePiNilradicalIsMaximal` : Let `M` be a submonoid of a direct product of commutative rings `R i`. If each `R i` has maximal nilradical then the direct product `∏ R i` surjects onto the localization of `∏ R i` at `M`. --- [![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$	28/0	Mathlib/RingTheory/Localization/Pi.lean	1	24	['Paul-Lez', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'maddycrim']	nobody	10-61153 10 days ago	12-56221 12 days ago	59-43050 59 days
23838	FordUniver author:FordUniver	feat(SimpleGraph): added completeGraph.adjDecidable	added completeGraph.adjDecidable --- Strangely `DecidableRel (completeGraph V).Adj` does not seem to be automatically inferred from `Top.adjDecidable` even though `⊤ : SimpleGraph V` is defined as `completeGraph V`. Am I missing something here or is it as simple as adding these two lines to mathlib?	new-contributor t-combinatorics	4/1	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	8	['FordUniver', 'YaelDillies', 'github-actions']	nobody	10-45618 10 days ago	10-56594 10 days ago	10-56648 10 days
21539	Raph-DG author:Raph-DG	feat(LinearAlgebra): Symmetric Algebra	Defined the universal property for the symmetric algebra of a module over a commutative ring, provided an explicit construction and proved that this satisfies the universal property. Also proved that the multivariate polynomial ring generated by a basis of a module satisfies the universal property of the symmetric algebra of that module. Co-authored-by: Zhixuan Dai <22300180006@m.fudan.edu.cn> Co-authored-by: Zhenyan Fu Co-authored-by: Yiming Fu Co-authored-by: Wang Jingting --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-algebra label:t-algebra$	223/0	Mathlib.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/MvPolynomial.lean	4	47	['ADedecker', 'Raph-DG', 'YaelDillies', 'eric-wieser', 'github-actions', 'xyzw12345']	nobody	10-27479 10 days ago	10-85713 10 days ago	66-57308 66 days
23648	wwylele author:wwylele	feat(Topology/Order): add `Dense.exists_seq_strict{Mono/Anti}_tendsto`	Add `Dense.exists_seq_strict{Mono/Anti}_tendsto{'}` that restricts the sequence to a dense subset. This is useful for e.g. finding a monotone rational sequence approaching a real number. Co-authored-by: Jireh Loreaux --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	62/0	Mathlib/Topology/Instances/Real/Lemmas.lean,Mathlib/Topology/Order/IsLUB.lean	2	10	['github-actions', 'j-loreaux', 'wwylele']	nobody	9-14841 9 days ago	13-47375 13 days ago	15-16937 15 days
22823	b-reinke author:b-reinke	feat(Algebra/Ring): associator of a non-associative ring	If `R` is a non-associative ring, then `(x * y) * z - x * (y * z)` is called the `associator` of ring elements `x y z : R`. The associator vanishes exactly when `R` is associative. We prove variants of this statement also for the `AddMonoidHom` bundled version of the associator, as well as the bundled version of `mulLeft₃` and `mulRight₃`, the multiplications `(x * y) * z` and `x * (y * z)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-algebra label:t-algebra$	133/8	Mathlib.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Ring/Associator.lean	3	46	['Paul-Lez', 'YaelDillies', 'b-reinke', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	8-73625 8 days ago	8-81162 8 days ago	32-56111 32 days
19796	peakpoint author:peakpoint	feat: Peano form of Taylor's theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	329/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean	9	13	['RemyDegenne', 'github-actions', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	8-71259 8 days ago	8-74130 8 days ago	33-36705 33 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	92/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	10	['Paul-Lez', 'github-actions', 'grunweg']	nobody	8-70803 8 days ago	8-70803 8 days ago	30-77130 30 days
23718	syur2 author:syur2	feat(Algebra): hom localize equiv localize hom	Add the linear equiv of `S^{-1}(M =>[R] N)` equiv `(S^{-1} M) =>[S^{-1}R] (S^{-1} N)` for finitely presented module `M`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	21/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	1	['github-actions']	nobody	8-24541 8 days ago	13-4086 13 days ago	13-4084 13 days
22503	Kevew author:Kevew	chore(Nat): Nat factorization multiplicity	Ported lemmas from `Data/Nat/Multiplicity` to into a new file called `Data/Nat/Factorization/Multiplicity`, re-written in terms of `factorization`. Also, I'm new to this so is it fine to have a lemma copied over from another file? Like, I copied over @[simp] theorem Prime.factorization_self {p : ℕ} (hp : Prime p) : p.factorization p = 1 := by simp [hp] from Dat/Nat/Factorization/Basic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	269/15	Mathlib.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Multiplicity.lean,Mathlib/Data/Nat/Multiplicity.lean	4	31	['Kevew', 'Paul-Lez', 'github-actions', 'grunweg']	Kevew assignee:Kevew	7-80125 7 days ago	36-27741 1 month ago	46-58090 46 days
23949	Louddy author:Louddy	feat: SkewPolynomial	# Univariate skew polynomials Skew polynomials are represented as `SkewMonoidAlgebra R (Multiplicative ℕ)`, where `R` is usually at least a Semiring. In this file, we define `SkewPolynomial` and provide basic instances. This is currently missing the definition of `coeff` and `single` as they require a more advance interface of `SkewMonoidAlgebra` which is still WIP (See TODOs in file). Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra blocked-by-other-PR label:t-algebra$	600/42	Mathlib.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewPolynomial/Basic.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-64257 7 days ago	7-64258 7 days ago	0-2389 39 minutes
23338	WilliamCoram author:WilliamCoram	feat: restricted power series form a ring	We define restricted powerseries over a normed ring R, and show they form a ring when R has the ultrametric property. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	17	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg']	nobody	7-58164 7 days ago	23-67517 23 days ago	23-67642 23 days
22243	luigi-massacci author:luigi-massacci	feat(Topology/MetricSpace/Gluing): Inductive limits of separable spaces are separable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	23/0	Mathlib/Topology/MetricSpace/Gluing.lean	1	9	['Paul-Lez', 'github-actions', 'j-loreaux', 'luigi-massacci', 'mathlib-bors']	nobody	5-52227 5 days ago	11-58487 11 days ago	2-23272 2 days
22208	Thmoas-Guan author:Thmoas-Guan	feat(Algebra):filtered ring hom	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: #20913 - [ ] depends on: #22632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	809/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-83123 3 days ago	28-67965 28 days ago	0-267 4 minutes
11021	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology) : add join of augmented SSets	This pull-request adds the definition of the join of augmented SSets defined as contravariant functors from `WithInitial SimplexCategory` to `Type u`. In addition it shows that the join of two standard augmented SSets is again an augmented SSets. From this the definition of the join of simplicial sets should follow easily. To aid the above theory, an api for `WithInitial SimplexCategory` has been created, with the notion of the `join` and `split` (forming a sort of inverse to join) of objects in this category are defined. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory 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	261-86303 8 months ago	317-81349 10 months ago	1-20125 1 day
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	242-63602 7 months ago	247-79844 8 months ago	54-52408 54 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/)	new-contributor t-algebra t-topology merge-conflict awaiting-author label:t-algebra$	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	242-63436 7 months ago	273-64761 8 months ago	14-58814 14 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/)	new-contributor t-category-theory 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	207-2621 6 months ago	207-2621 6 months ago	0-0 0 seconds
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	206-49496 6 months ago	206-49496 6 months 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	198-45474 6 months ago	198-45474 6 months 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	198-45474 6 months ago	198-45475 6 months 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	198-45473 6 months ago	198-45473 6 months ago	0-613 10 minutes
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/)	new-contributor t-algebra t-topology t-category-theory merge-conflict WIP label:t-algebra$	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	191-55672 6 months ago	191-55672 6 months ago	7-63215 7 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	180-68131 5 months ago	180-68131 5 months ago	6-8380 6 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/)	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	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	172-80233 5 months ago	172-80233 5 months ago	0-179 2 minutes
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	170-39441 5 months ago	197-8232 6 months 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	164-10007 5 months ago	164-10007 5 months 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	161-52528 5 months ago	161-52528 5 months 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	157-4960 5 months ago	unknown	unknown
16116	jjdishere author:jjdishere	feat(Field): add theorems in Stacks Project Chapter 09FA Fields	Add theorems in Stacks Project Chapter 09FA Fields that are not in mathlib. Co-authored-by: --- - [x] depends on: #16105 [![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$	6/2	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/Subfield.lean	2	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	155-52954 5 months ago	157-35362 5 months ago	0-0 0 seconds
16743	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define HasStrictDerivAt.implicitFunOfBivariate	In [this](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Implicit.20function.20theorem.20in.20familiar.20form) Zulip thread @Komyyy proved the "familiar" implicit function theorem. Then I wrote a proposal for a Mathlib PR. (Updated) it went: 1. `noncomputable def implicitFunOfBivariate {f : X × Y → Z} {p₀ : X × Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) p₀) : X → Y := ...` 2. `noncomputable def implicitFunOfBivariate' {f : X → Y → Z} {x₀ : X} {y₀ : Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hfx : ContDiffAt 𝕜 1 (f · y₀) x₀) (hfy : ContDiffAt 𝕜 1 (f x₀ ·) y₀) (hfx₀ : fderiv 𝕜 (f · y₀) x₀ = fx) (hfy₀ : fderiv 𝕜 (f x₀ ·) y₀ = fy) : X → Y := ...` 3. `theorem image_eq_iff_implicitFunOfBivariate {f : X × Y → Z} {p₀ : X × Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) p₀) : ∀ᶠ p in 𝓝 p₀, f p = f p₀ ↔ hf₀.implicitFunOfBivariate p.1 = p.2 := ...` 4. `theorem implicitFunOfBivariate_hasStrictFDerivAt {f : X × Y → Z} {x₀ : X} {y₀ : Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) (x₀, y₀)) : HasStrictFDerivAt hf₀.implicitFunOfBivariate (-fy.symm ∘L fx) x₀ := ...` 5. something on the second derivative (or higher). Although my proposal elicited no response, I am making this micro-PR to address points 1, 3 and 4 since some limited enthusiasm had been shown earlier in that thread (admittedly for another proposal made by another person). I am testing the waters; if this PR gets anywhere I may continue to work on points 2 and 5. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	132/8	Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/Order/Filter/Prod.lean	4	4	['github-actions', 'sgouezel']	sgouezel assignee:sgouezel	144-82002 4 months ago	144-82002 4 months ago	63-71154 63 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/)	new-contributor t-algebra merge-conflict label:t-algebra$	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	144-74532 4 months ago	144-74532 4 months ago	20-16585 20 days
19299	javierlcontreras author:javierlcontreras	feat(Algebra/CategoryTheory): Add CommAlgebraCat	--- - [x] depends on: #19065 [![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$	26/1	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Category/AlgebraCat/Basic.lean	2	4	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	144-60537 4 months ago	144-76709 4 months ago	0-2116 35 minutes
19526	metakunt author:metakunt	feat:closure properties of numbers that are introspective to polynomials	Prove Part 1 of Claim 1.(i) of Theorem 6.1 in https://www3.nd.edu/~andyp/notes/AKS.pdf. ---- Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Aks.20primality.20Theorem.206.2E1.20Claim.20.28i.29.20proven	new-contributor t-number-theory merge-conflict awaiting-author	57/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	10	['Ruben-VandeVelde', 'github-actions', 'jcommelin', 'kim-em', 'metakunt']	nobody	138-75865 4 months ago	138-75865 4 months ago	0-16072 4 hours
16344	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): add induction principle, further simp opts for lift	Add an induction principle for proving properties about a `FreeProduct`. Replaces a number of `simp` and `aesop` calls in `lift` with `simp_rw` scripts to reduce compilation time (thanks Kevin!). - [ ] depends on: #15686 --- In a couple of places, I have used `simp↓` attributes when the linter tells me that a `simp` lemma is not in simp-normal form, instead of changing the LHS as the linter recommends. I claim that this is a legitimate use to tag important foundational lemmas that should be kept in a convenient human-readable form, but also contain nontrivial components that `simp` cannot already handle completely. Please tell me your thoughts. [![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$	240/17	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	131-59381 4 months ago	131-59381 4 months ago	0-479 7 minutes
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	127-27377 4 months ago	133-62800 4 months ago	0-4534 1 hour
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	109-66208 3 months ago	154-81836 5 months ago	0-0 0 seconds
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	93-49389 3 months ago	93-49389 3 months ago	0-4704 1 hour
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	92-68475 3 months ago	92-68475 3 months ago	0-1791 29 minutes
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	92-68475 3 months ago	92-68475 3 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	92-34394 3 months ago	92-34394 3 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	87-56053 2 months ago	87-56054 2 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	80-73401 2 months ago	80-73401 2 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	79-47834 2 months ago	79-47834 2 months ago	9-73631 9 days
14799	luigi-massacci author:luigi-massacci	feat(Analysis/MeanInequalities): Weighted QM-AM inequality	The inequality between the quadratic and arithmetic mean as a consequence of Jensen's inequality. Weighted version for positive real valued functions from a `Finset`. Fix notation for sums, switching to `∈` in place of `in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis easy merge-conflict awaiting-author	26/3	Mathlib/Analysis/MeanInequalities.lean	1	8	['YaelDillies', 'acmepjz', 'github-actions', 'luigi-massacci', 'vihdzp']	nobody	78-41005 2 months ago	78-41005 2 months ago	0-38862 10 hours
20248	peabrainiac author:peabrainiac	feat(Topology/Compactness): first-countable locally path-connected spaces are delta-generated	Shows that all first-countable locally path-connected spaces are delta-generated (so in particular all normed spaces and convex subsets thereof are), and that delta-generated spaces are equivalently generated by the unit interval or standard simplices. --- - [ ] depends on: #21616 In principle, this should be close to all that's required to show that all simplicial complexes and CW-complexes are delta-generated; I just haven't done it yet because I'm not sure which file to best do it in. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	68-30711 2 months ago	68-30711 2 months ago	39-21495 39 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	13	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco']	nobody	63-81788 2 months ago	63-81788 2 months ago	27-65384 27 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	63-64810 2 months ago	63-64810 2 months ago	37-29014 37 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 - [ ] 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 blocked-by-other-PR 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	58-68436 1 month ago	58-68437 1 month ago	179-12934 179 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	53-31082 1 month ago	53-31082 1 month ago	0-13879 3 hours
22245	Champitoad author:Champitoad	feat(CategoryTheory/Subobject): add formalization of subobject classifier	This introduces a file `Classifier.lean` defining the notion `Classifier C` of subobject classifier in any category `C` with a terminal object, following Section I.3 of "Sheaves in Geometry and Logic" [MM92]. This is related to but independent from #21281, because our definition associates a characteristic map to every _subobject_ rather than every _monomorphism_. Adopting this "extensional" rather than "intensional" definition allows us to formalize the proof of Proposition 1 in [MM92, Section I.3] (`hasClassifier_isRepresentable_iff`), that `C` has a subobject classifier if and only if the subobjects presheaf `sub C` is representable. --- [![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	5219/2536	Cache/Hashing.lean,Cache/IO.lean,Cache/Lean.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Category/AlgebraCat/Limits.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/HopfAlgebraCat/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.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/Differentials/Basic.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Pointwise/Set/Card.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/HasNoLoop.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Angle.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/Positivity.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Exp.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/Fourier/Inversion.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/PSeriesComplex.lean,Mathlib/Analysis/SpecialFunctions/CompareExp.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/PoissonSummation.lean,Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ArctanDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ComplexDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/CategoryTheory/Abelian/FreydMitchell.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Connected.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Indization.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Coseparator.lean	205	10	['Champitoad', 'github-actions', 'joelriou']	nobody	52-40897 1 month ago	52-42170 1 month ago	0-38059 10 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	49-73408 1 month ago	49-73408 1 month 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	48-57719 1 month ago	48-57719 1 month ago	15-40648 15 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	46-15832 1 month ago	46-15832 1 month ago	92-44198 92 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	44-59422 1 month ago	44-59422 1 month ago	16-76141 16 days
22349	dtumad author:dtumad	feat(Control): Laws for monads with compatible `failure` operation	Add a class for a `Monad` that also has an `Alternative` instance, and a class `LawfulAlternative` for types where the failure and monad structures are compatible in the expected way. --- I'm not sure if this should instead go in `Batteries.Control` instead of mathlib, or at least lemmas like `OptionT.run_failure` maybe should. Some of the instances like `Set` would still need to be added in mathlib either way. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict WIP	175/3	Mathlib.lean,Mathlib/Control/Lawful.lean,Mathlib/Control/Monad/AlternativeMonad.lean	3	8	['dtumad', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	37-37767 1 month ago	37-37767 1 month ago	1-20563 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	36-55248 1 month ago	36-55248 1 month ago	29-48368 29 days
20171	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define turanDensity	Define the Turán density `turanDensity H` of a simple graph `H`: `turanDensity H` is the limit of `extremalNumber (Fin n) H / n.choose 2` as `n` approaches `∞`. Also prove - the Turán density of a simple graph is well-defined, that is, the limit `extremalNumber (Fin n) H / n.choose 2` as `n` approaches `∞` exists, - `extremalNumber (Fin n) H` is asymptotically equivalent to `turanDensity H * n.choose 2` as `n` approaches `∞`. --- - [ ] depends on: #19865 - [ ] depends on: #20681 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics merge-conflict blocked-by-other-PR WIP	854/95	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/SubgraphIso.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/Sym/Sym2.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-3967 1 month ago	35-3967 1 month ago	0-2015 33 minutes
20240	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 on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2+(card α)(card V)/2` edges. --- - [ ] depends on: #19865 - [ ] depends on: #20738 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict blocked-by-other-PR WIP	810/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean,Mathlib/Combinatorics/SimpleGraph/SubgraphIso.lean,Mathlib/Data/Nat/Choose/Cast.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-3950 1 month ago	35-3950 1 month ago	0-555 9 minutes
8102	miguelmarco author:miguelmarco	feat (Tactic): add unify_denoms and collect_signs tactics	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 awaiting-author enhancement	431/1	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Order/Lemmas.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean	8	16	['github-actions', 'joneugster', 'kbuzzard', 'miguelmarco']	nobody	30-55654 30 days ago	63-86119 2 months ago	17-12620 17 days
15686	robertmaxton42 author:robertmaxton42	refactor(LinearAlgebra/FreeProduct): move PowerAlgebra construction to its own namespace, minor simp opts	* Make the namespace `asPowers` to simplify/shorten names when working primarily with the power algebra construction of the free product * Also adds related some convenience API to `rel'` * Add simp shortcut attribute to `lift_comp_ι` and add simp shortcut lemma `lift_algebraMap` * Replaces some `aesop` calls with `simp_rw` for performance --- [![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$	143/11	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	19	['YaelDillies', 'github-actions', 'kbuzzard', 'robertmaxton42']	nobody	27-26811 27 days ago	131-59381 4 months ago	80-18014 80 days
22714	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.	large-import new-contributor t-measure-probability merge-conflict awaiting-author	300/14	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	['EtienneC30', 'Paul-Lez', 'github-actions']	EtienneC30 assignee:EtienneC30	24-59585 24 days ago	28-41695 28 days ago	12-38130 12 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	18-4247 18 days ago	unknown	unknown
11768	JovanGerb author:JovanGerb	feat: Interactive Library Rewrite	This PR defines the `rw??` library rewrite tactic that uses my `RefinedDiscrTree`. This is a point&click tactic, letting the user click on subexpressions in the main goal. The results are sorted by relevance, and are separated into sections based on the matched pattern. It comes with a filter button that allows you to switch between the (default) filtered view, with removed duplicate lemmas and not showing lemma names, and the complete view. There is also a section for definitionally unfolding the selected expression - these rewrites do not correspond to a library lemma. --- - [ ] depends on: #11968 - [x] depends on: #12016 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict blocked-by-other-PR	2788/1253	Mathlib.lean,Mathlib/Lean/GoalsLocation.lean,Mathlib/Lean/Meta/RefinedDiscrTree.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Initialize.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/StateList.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Topology/Defs/Basic.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/RefinedDiscrTree.lean,scripts/noshake.json	20	n/a	['JovanGerb', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	16-71681 16 days 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	12-85636 12 days ago	12-85636 12 days 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	12-35191 12 days ago	12-35191 12 days 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	9-67824 9 days ago	9-67825 9 days 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	8-70552 8 days ago	8-70552 8 days ago	55-53553 55 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
18472	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Comm.to` instances	`CommRing.toRing` is an exception. `CommRing` is so important that it needs to be looked up early. An important goal of #7873 is also to search for `Zero/One/Add/Mul` instances first along `Zero/One/Add/Mul` -> ... -> `Ring` -> `CommRing` -> `Field`. --- - [ ] depends on: #18474 - [ ] depends on: #18641 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	33/10	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/Topology/MetricSpace/Polish.lean	14	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	163-35624 5 months ago	163-47203 5 months ago	0-258 4 minutes
18464	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `toMul` and `toAdd` instances	A subsequent PR will try to swap the priorities of `Semigroup.toMul` and `MulOneClass.toMul` to see if it gets better. --- - [ ] depends on: #18472 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	38/12	Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	163-19637 5 months ago	170-31859 5 months ago	0-8515 2 hours
23730	faenuccio author:faenuccio	feat: define valued local fields	Co-authored by: @mariainesdff --- - [ ] depends on: #23725 - [ ] depends on: #23726 - [ ] depends on: #23727	t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	75/0	Mathlib.lean,Mathlib/NumberTheory/LocalField/Valued.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-1266 12 days ago	12-1266 12 days ago	0-2 2 seconds
23727	faenuccio author:faenuccio	chore(RingTheory/Valuation/Discrete/Basic): refactor the definition of discrete valuation to allow for more general targets	Co-authored by @mariainesdff The two `ToDo` mentioned in the docstring are WIP by María Inés de Frutos-Fernández and Filippo A. E. Nuccio. --- - [ ] depends on: #23725 - [ ] depends on: #23726	large-import t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	37/24	Mathlib/RingTheory/Valuation/Discrete/Basic.lean	1	6	['github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	8-62085 8 days ago	11-64683 11 days ago	0-3 3 seconds
18706	FR-vdash-bot author:FR-vdash-bot	perf: change the priority of `*.toSemiring` instances	Need to fix some regressions in subsequent PRs. --- - [ ] depends on: #18468 - [ ] depends on: #18470 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR WIP label:t-algebra$	24/15	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/PurelyInseparable.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Localization/Integral.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-44533 7 days ago	163-20271 5 months ago	0-576 9 minutes
18641	FR-vdash-bot author:FR-vdash-bot	perf: change the priority of `*.toRing` instances	--- - [ ] depends on: #18468 - [ ] depends on: #18470 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	7/1	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	4	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	7-44531 7 days ago	165-11382 5 months ago	0-627 10 minutes
23726	faenuccio author:faenuccio	feat(RingTheory/Valuation/Basic): defined Nontrivial valuations	Co-authored with @mariainesdff	t-algebra label:t-algebra$	19/1	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['faenuccio', 'github-actions', 'kbuzzard']	nobody	4-58128 4 days ago	4-59913 4 days ago	4-62189 4 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	283-66982 9 months ago	283-67005 9 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	109-66208 3 months ago	154-81836 5 months ago	0-0 0 seconds
24004	alreadydone author:alreadydone	chore(RingTheory): equivalence between algebraicity over `IntermediateField.adjoin` and `Algebra.adjoin`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	206/25	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/AlgebraicIndependent/AlgebraicClosure.lean,Mathlib/RingTheory/Localization/FractionRing.lean,lake-packages/Cli,lake-packages/Qq,lake-packages/aesop,lake-packages/proofwidgets,lake-packages/std	14	5	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	5-53399 5 days ago	5-53399 5 days ago	0-2231 37 minutes
23465	JovanGerb author:JovanGerb	lean pr testing 7740	Let's see the performance implications of more specializing and inlining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	9	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	19-9583 19 days ago	0-18651 5 hours
23644	JovanGerb author:JovanGerb	Lean pr testing 7804	Testing an optimization in `simp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	3-70319 3 days ago	15-32707 15 days ago	0-2933 48 minutes
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 --- - [ ] 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	42/23	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	15	['github-actions', 'grunweg', 'joneugster', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	1-47700 1 day ago	65-65436 2 months ago *	10-21925 10 days *

PRs from a fork of mathlib

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
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	11-65129 11 days ago	11-65129 11 days ago	0-0 0 seconds
23937	unknown author:unknown	feat(Algebra): vanishing of induced hom between ext	unknown description	t-algebra t-category-theory blocked-by-other-PR WIP label:t-algebra$	-1/-1		-1	n/a	None	nobody	2-72857 2 days ago	unknown	unknown
23986	ShouxinZhang author:ShouxinZhang	feat(FieldTheory/RatFunc): add RatFunc.toFractionRingAlgEquiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon t-algebra label:t-algebra$	17/0	Mathlib/FieldTheory/RatFunc/Basic.lean	1	1	['joneugster']	nobody	1-37911 1 day ago	1-37911 1 day ago	0-0 0 seconds
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	104-13541 3 months ago	104-13541 3 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	261-86302 8 months ago	423-67467 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	243-386 8 months ago	243-388 8 months ago	18-13508 18 days
15809	archiebrowne author:archiebrowne	feat(RingTheory/MvPolynomial/Ideal): introduce new lemmas about MvPolynomial Ideals	Four new lemmas about MvPolynomialIdeals `sub_span_span_sub`, `span_eq_iff_basis_sub`, `mem_basis_mem_span`, `mem_span_exists_dvd_mem_basis`. --- [![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$	38/0	Mathlib/RingTheory/MvPolynomial/Ideal.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	1	151-60223 5 months ago	206-62143 6 months ago	41-7533 41 days
18893	vihdzp author:vihdzp	feat(Order/InitialSeg): `InitialSeg.exists_relIso_sum`	If `r` is an initial segment of `s`, there exists some other relation `t` with `Sum.Lex r t ≃r s`. --- - [x] depends on: #17989 - [ ] depends on: #20409 The names `sumLexLtLE` and `sumLexLeLT` are very sketch, and better suggestions are welcome. Likewise it'd be cool if anyone can figure out how to golf these results. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author blocked-by-other-PR	102/10	Mathlib/Order/InitialSeg.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/SetTheory/Ordinal/Basic.lean	4	12	['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	106-20761 3 months ago	106-20762 3 months ago	46-65043 46 days
18693	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add ConjRootClass	Co-authored-by: FR --- 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$	199/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean	3	6	['Vierkantor', 'alreadydone', 'github-actions']	nobody	1	101-80511 3 months ago	101-80511 3 months ago	61-68166 61 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	88-81974 2 months ago	88-81974 2 months ago	69-35596 69 days
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	56	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'madvorak', 'niklasmohrin']	nobody	1	67-3365 2 months ago	67-3365 2 months ago	86-21072 86 days
21265	ADedecker author:ADedecker	feat: some lemmas about pointwise actions of units on filters and uniformities	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology delegated label:t-algebra$	45/0	Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	2	7	['github-actions', 'mathlib-bors', 'ocfnash']	nobody	1	63-41112 2 months ago	63-41112 2 months ago	15-25642 15 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	55	['eric-wieser', 'girving', 'github-actions', 'tomaz1502']	nobody	1	55-22274 1 month ago	86-57039 2 months ago	86-57034 86 days
22320	jjdishere author:jjdishere	feat(RingTheory/WittVector): the Teichmuller series	In this PR, we show that every element `x` of the Witt vectors `𝕎 R` can be written as the (`p`-adic) summation of the Teichmuller series. Instead of using `tsum`, we only show that `p ^ (n + 1)` divides `x` minus the summation of the first `n + 1` terms of the Teichmuller series. We also show that if `p` divides the first (n + 1) coefficients of a Witt vector, then `p^(n+1)` divides the `n`-th ghost component. #21564 depends on this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	204/2	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean	6	12	['github-actions', 'jjdishere', 'riccardobrasca']	nobody	1	45-68857 1 month ago	45-68857 1 month ago	6-3646 6 days
20230	joelriou author:joelriou	feat(CategoryTheory): categories of homological complexes are Grothendieck abelian	--- - [x] depends on: #19979 - [x] depends on: #20229 - [x] depends on: #20233 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	73/0	Mathlib.lean,Mathlib/Algebra/Homology/GrothendieckAbelian.lean	2	2	['callesonne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1	43-37914 1 month ago	53-39636 1 month ago	53-39619 53 days
22404	joelriou author:joelriou	feat(Algebra/Homology): connecting a chain complex and a cochain complex	Given a chain complex `K`: `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0`, a cochain complex `L`: `L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, a morphism `d₀: K.X 0 ⟶ L.X 0` satisfying the identifies `K.d 1 0 ≫ d₀ = 0` and `d₀ ≫ L.d 0 1 = 0`, we construct a cochain complex indexed by `ℤ` of the form `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0 ⟶ L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, where `K.X 0` lies in degree `-1` and `K.X 0` in degree `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	116/0	Mathlib.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean	2	2	['callesonne', 'github-actions']	nobody	1	40-35042 1 month ago	49-60595 1 month ago	49-60580 49 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 and undocumented scripts when linting Mathlib 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). --- (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 awaiting-author	34/10	scripts/lint-style.lean	1	12	['adomani', 'github-actions', 'grunweg', 'joneugster']	joneugster assignee:joneugster	1	39-49980 1 month ago	53-46253 1 month ago	19-1483 19 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	32-82324 1 month ago	32-82324 1 month ago	20-81771 20 days
22828	joelriou author:joelriou	feat(CategoryTheory): parametrized adjunctions	Given bifunctors `F : C₁ ⥤ C₂ ⥤ C₃` and `G : C₁ᵒᵖ ⥤ C₃ ⥤ C₂`, this PR introduces adjunctions with a parameter `F ⊣₂ G`. In the case of closed monoidal categories, we obtain `curriedTensor C ⊣₂ internalHom`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	127/0	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Parametrized.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean	3	4	['emilyriehl', 'github-actions', 'joelriou', 'mckoen']	nobody	1	32-77689 1 month ago	36-37951 1 month ago	38-61758 38 days
22457	Komyyy author:Komyyy	feat(Mathlib/Computability/Ackermann): Ackermann function is computable	It had been proved that Ackermann function is not primitive recursive, but not been proved that it's computable. I proved that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	51/1	Mathlib/Computability/Ackermann.lean	1	11	['Komyyy', 'github-actions', 'vihdzp']	nobody	1	27-23032 27 days ago	46-31826 1 month ago	47-60599 47 days
23240	urkud author:urkud	feat(Topology/Maps): `IsOpenMap` and `ClusterPt`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	17/4	Mathlib/Topology/Maps/Basic.lean	1	6	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	1	26-26311 26 days ago	26-33390 26 days ago	0-12104 3 hours
23470	erdOne author:erdOne	feat(AlgebraicGeometry): section of a k-scheme is a closed immersion	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	89/3	Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/PullbackCarrier.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/Scheme.lean	6	7	['chrisflav', 'github-actions']	nobody	1	18-47846 18 days ago	19-18856 19 days ago	19-18886 19 days
22635	Kiolt author:Kiolt	feat: submonoid of pairs with quotient in a submonoid	This submonoid is part of the definition of toric ideals. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-algebra label:t-algebra$	36/0	Mathlib.lean,Mathlib/GroupTheory/MonoidLocalization/DivPairs.lean	2	10	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	1	17-80464 17 days ago	17-80517 17 days ago	43-67450 43 days
17802	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Veblen): epsilon and gamma ordinals	We define the epsilon function `ε_ o = veblen 1 o`, and the gamma function `Γ_ o` which enumerates the fixed points of `veblen · 0`. --- - [x] depends on: #17751 - [x] depends on: #18611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	146/7	Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	2	15	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	16-23351 16 days ago	16-23351 16 days ago	48-35738 48 days
18210	vihdzp author:vihdzp	feat(Order/Hom/Basic): `WithBot (Fin n) ≃o Fin (n + 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	16/0	Mathlib/Order/Hom/Basic.lean	1	7	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	2	16-18553 16 days ago	165-30277 5 months ago	10-77913 10 days
19946	vihdzp author:vihdzp	feat(SetTheory/ZFC/Basic): order instances	Sets form a partial order under the subset relation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	38/2	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	8	['alreadydone', 'b-mehta', 'github-actions', 'vihdzp']	nobody	1	16-7569 16 days ago	16-11931 16 days ago	47-12661 47 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 delegated	119/3	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	12	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	1	14-71075 14 days ago	35-61300 1 month ago	15-14325 15 days
23684	alreadydone author:alreadydone	feat(RingTheory): integral extensions of comm. rings are local homs	--- The import increase only affects one file so I hope it's okay. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	57/64	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/SimpleRing/Field.lean	12	4	['alreadydone', 'github-actions', 'xroblot']	nobody	1	13-84334 13 days ago	14-29332 14 days ago	14-29356 14 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	4	['alreadydone', 'erdOne', 'github-actions', 'xroblot']	nobody	2	13-84254 13 days ago	14-60602 14 days ago	14-60601 14 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/)	maintainer-merge 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	10-83852 10 days ago	11-16285 11 days ago	54-54882 54 days
22018	maddycrim author:maddycrim	feat(RingTheory/Localization/Pi): localization of a finite direct product where each semiring in product has maximal nilradical is a projection	For noncomputable def `surjectivePiNilradicalIsMaximal` : Let `M` be a submonoid of a direct product of commutative rings `R i`. If each `R i` has maximal nilradical then the direct product `∏ R i` surjects onto the localization of `∏ R i` at `M`. --- [![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$	28/0	Mathlib/RingTheory/Localization/Pi.lean	1	24	['Paul-Lez', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'maddycrim']	nobody	1	10-61153 10 days ago	12-56221 12 days ago	59-43050 59 days
21539	Raph-DG author:Raph-DG	feat(LinearAlgebra): Symmetric Algebra	Defined the universal property for the symmetric algebra of a module over a commutative ring, provided an explicit construction and proved that this satisfies the universal property. Also proved that the multivariate polynomial ring generated by a basis of a module satisfies the universal property of the symmetric algebra of that module. Co-authored-by: Zhixuan Dai <22300180006@m.fudan.edu.cn> Co-authored-by: Zhenyan Fu Co-authored-by: Yiming Fu Co-authored-by: Wang Jingting --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-algebra label:t-algebra$	223/0	Mathlib.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/MvPolynomial.lean	4	47	['ADedecker', 'Raph-DG', 'YaelDillies', 'eric-wieser', 'github-actions', 'xyzw12345']	nobody	1	10-27479 10 days ago	10-85713 10 days ago	66-57308 66 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 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	24	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em']	nobody	1	8-83071 8 days ago	12-4837 12 days ago	82-54712 82 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	255/1	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	17	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'xroblot']	nobody	1	8-78571 8 days ago	19-38234 19 days ago	20-40754 20 days
22823	b-reinke author:b-reinke	feat(Algebra/Ring): associator of a non-associative ring	If `R` is a non-associative ring, then `(x * y) * z - x * (y * z)` is called the `associator` of ring elements `x y z : R`. The associator vanishes exactly when `R` is associative. We prove variants of this statement also for the `AddMonoidHom` bundled version of the associator, as well as the bundled version of `mulLeft₃` and `mulRight₃`, the multiplications `(x * y) * z` and `x * (y * z)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-algebra label:t-algebra$	133/8	Mathlib.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Ring/Associator.lean	3	46	['Paul-Lez', 'YaelDillies', 'b-reinke', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	1	8-73625 8 days ago	8-81162 8 days ago	32-56111 32 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	59/0	Mathlib.lean,Mathlib/Analysis/Convex/Polytope.lean	2	5	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	1	7-63107 7 days ago	7-76610 7 days ago	8-3837 8 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	62/0	Mathlib/ModelTheory/Substructures.lean	1	12	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions']	nobody	1	6-55524 6 days ago	6-55524 6 days ago	26-24349 26 days
23066	ybenmeur author:ybenmeur	feat: more lemmas for Tannaka duality for finite groups	Prove more of the lemmas needed to prove Tannaka duality for finite groups. --- This is everything that doesn't depend on `eval_of_algHom` (#23065). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	44/0	Mathlib/RepresentationTheory/Tannaka.lean	1	15	['github-actions', 'kbuzzard', 'ybenmeur']	nobody	1	6-12280 6 days ago	31-51048 1 month ago	31-51097 31 days
23490	erdOne author:erdOne	feat(Algebra/Category): the category of topological modules	Co-authored-by: Richard Hill --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	532/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,MathlibTest/CategoryTheory/ConcreteCategory/TopModuleCat.lean	3	16	['chrisflav', 'erdOne', 'github-actions', 'kbuzzard']	nobody	1	5-2967 5 days ago	11-74722 11 days ago	6-86010 6 days
23964	BoltonBailey author:BoltonBailey	docs: Add documentation arbitrarily	@mattrobball asked in the Mathlib Community meeting today what it would look like if we asked Claude code to give us improved documentation. I made this draft PR by selecting five declarations arbitrarily from `nolints.json` and asking Cursor to document them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	49/1	Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean	5	8	['ADedecker', 'BoltonBailey', 'eric-wieser', 'github-actions', 'jcommelin', 'mattrobball']	nobody	1	3-56289 3 days ago	6-43629 6 days ago	7-20251 7 days
23643	AntoineChambert-Loir author:AntoineChambert-Loir	chore(RingTheory/MvPowerSeries/PiTopology): limit of truncation of power series	Extract a lemma that says that for a multivariate power series, `trunc' R d f` converges to `f` when `d` converges to infinity. Prove the analogous lemma for `MvPowerSeries.trunc` (if the set of indeterminates is nonempty). Move this lemma and the denseness of polynomials to the `PiTopology` file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	44/13	Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean	3	17	['AntoineChambert-Loir', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky']	nobody	2	3-40212 3 days ago	3-70862 3 days ago	15-37787 15 days
24074	ooovi author:ooovi	chore(Probability/Distributions): remove `open Classical ...` from `toMeasure_uniformOfFintype_apply`	Remove `open scoped Classical in` in front of the `toOuterMeasure_uniformOfFintype_apply` and `toMeasure_uniformOfFintype_apply` theorems --- I encountered a hard-to-debug error due to this, leading to the implicit use of the classical `Finset s` instance in the theorem statement, see [the zulip thread](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/coercing.20between.20types.20with.20different.20instances). I hear the removal of the use of the `Classical` namespace for theorem statements is an ongoing project, so feel free to either tell me to remove more occurances e.g. in this file, or defer this PR in favour of the ongoing project.	t-measure-probability delegated	7/7	Mathlib/Probability/Distributions/Uniform.lean	1	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ooovi']	nobody	1	2-80983 2 days ago	3-31193 3 days ago	0-47844 13 hours
24036	Louddy author:Louddy	feat: add `HeightOneSpectrum.ofPrime`	Add a definition relating elements of type `HeightOneSpectrum R` with the (nonzero) prime elements of the monoid with zero `Ideal R`. (Note the distinction between `Prime` and `Ideal.IsPrime`). The documentation string is inspired from [Ideal.prime_iff_isPrime](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/DedekindDomain/Ideal.html#Ideal.prime_iff_isPrime). This was discussed [#mathlib4 > Placing a definition in `DedekindDomain.Ideal` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Placing.20a.20definition.20in.20.60DedekindDomain.2EIdeal.60/near/511647129). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	11/1	Mathlib/RingTheory/DedekindDomain/Ideal.lean	1	5	['Louddy', 'Ruben-VandeVelde', 'github-actions']	nobody	1	2-74087 2 days ago	4-73025 4 days ago	4-73083 4 days
23955	Louddy author:Louddy	feat: Ideal.count_associates_eq	Add variant of `UniqueFactorizationMonoid.count_normalizedFactors_eq` for associated Ideals. This is convenient when you need to talk about an element as `a₀ = x ^ n * a`. Note the file is slightly over the 1500 lines limit, I hope that is ok. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	35/1	Mathlib/RingTheory/DedekindDomain/Ideal.lean	1	5	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions']	nobody	1	2-61536 2 days ago	7-59090 7 days ago	7-59150 7 days
23963	alreadydone author:alreadydone	feat(RingTheory): isotypic API and Wedderburn–Artin existence	A replacement of #23583 with more meaningful intermediate results. Co-authored-by: Edison Xie @Whysoserioushah Co-authored-by: Jujian Zhang [jujian.zhang19@imperial.ac.uk](mailto:jujian.zhang19@imperial.ac.uk) --- - [ ] depends on: #24119 [![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$	622/143	Mathlib.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Nullstellensatz.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/SimpleModule/IsAlgClosed.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/SimpleModule/WedderburnArtin.lean,Mathlib/RingTheory/SimpleRing/Congr.lean,Mathlib/RingTheory/SimpleRing/Defs.lean,Mathlib/RingTheory/TwoSidedIdeal/Operations.lean,Mathlib/RingTheory/Unramified/Field.lean	32	22	['Whysoserioushah', 'alreadydone', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	1	2-45609 2 days ago	2-54559 2 days ago	4-62579 4 days
24122	apnelson1 author:apnelson1	feat(Combinatorics): multigraphs	This PR defines multigraphs via a structure `Graph a b` consisting of a vertex set, an edge set, and a 'binary incidence' predicate describing which edges are incident with which vertices. The definition uses the same 'embedded set' design as `Matroid`: the vertex and edge sets are modelled as `Set`s rather than types. We give basic API for incidence, adjacency and extensionality. [Zulip discussion.](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2324122.20Multigraphs) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	291/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Basic.lean,scripts/noshake.json	3	12	['Parcly-Taxel', 'apnelson1', 'b-mehta', 'github-actions', 'kmill', 'madvorak']	nobody	1	1-62076 1 day ago	2-51634 2 days ago	2-51694 2 days
23909	grunweg author:grunweg	chore: various fixes for the flexible linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		120/85	Mathlib/Condensed/Light/Epi.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/FinEnum.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/List/SplitBy.lean,Mathlib/Data/Matroid/Sum.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Vector3.lean,Mathlib/Data/WSeq/Relation.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Goursat.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/Probability/Kernel/Condexp.lean,Mathlib/RingTheory/Derivation/MapCoeffs.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Tactic/NormNum/NatFactorial.lean	30	8	['b-mehta', 'github-actions', 'grunweg']	nobody	1	1-60480 1 day ago	8-82367 8 days ago	8-82353 8 days
11968	JovanGerb author:JovanGerb	feat: improvements to RefinedDiscrTree	This PR defines `RefinedDiscrTree`, which is an improved version of `DiscrTree` with many new features, such as - indexing lambda terms, dependent forall terms, and bound variables. - giving a score to matches, in order to sort them - indexing star patterns so that `a+b` and `a+a` are indexed differently - taking into account eta reductions, so that `exp` can still be matched with the library pattern `fun x => exp (f x)`. This PR makes `RefinedDiscrTree` into a lazy data structure, meaning that it can be used without a cache, just like `LazyDiscrTree`. This PR also removes these features: - indexing `fun x => x` as `id` - indexing `fun x => f x + g x` as `f + g`, and similarly for `-`, `*`, `/`, `⁻¹`, `^`. - indexing `fun _ => 42` as `42` These equivalent indexings do not hold definitionally in the `reducible` transparency, which is the transparency that is used for unification when using a discrimination tree. Therefore, indexing these different expressions the same is actually inefficient rather than helpful. This is part of the bigger #11768, which uses this discrimination tree for a library rewriting tactic. This replaces an older version of `RefinedDiscrTree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	1631/1242	Mathlib.lean,Mathlib/Lean/Meta/RefinedDiscrTree.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Initialize.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/StateList.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Topology/Defs/Basic.lean,MathlibTest/RefinedDiscrTree.lean,scripts/noshake.json	16	78	['0art0', 'JovanGerb', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'rosborn']	nobody	1	1-36770 1 day ago	12-34673 12 days ago	186-59439 186 days
23942	Moises-Herradon-Cueto author:Moises-Herradon-Cueto	feat(WithTerminal): show equivalence of cones with `Over` category	Show how limits in an over category relate to limits in the original category. This is useful to show that if a functor `F` preserves limits, then `Over.post F` between corresponding over categories preserves limits as well. From Toric --- I could replace `Over` by `Under`, `Limit` by `Colimit`, etc to make dual versions. Should I? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-category-theory awaiting-author	123/0	Mathlib.lean,Mathlib/CategoryTheory/WithTerminal/Cone.lean	2	32	['Moises-Herradon-Cueto', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	1	0-86304 23 hours ago	2-47598 2 days ago	5-11182 5 days
24147	kbuzzard author:kbuzzard	feat: criterion for cofinite filter tends to cofinite.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order delegated	5/0	Mathlib/Order/Filter/Cofinite.lean	1	6	['b-mehta', 'github-actions', 'kbuzzard', 'mathlib-bors']	nobody	1	0-49922 13 hours ago	0-65052 18 hours ago	0-70668 19 hours
23558	JovanGerb author:JovanGerb	feat: don't delaborate to `⊔` or `⊓` if we have a `LinearOrder`	This PR changes the `⊔` and `⊓` notations to only be used by the delaborator if the type in question is not a linear order. This was suggested here [#mathlib4 > max and min delaborators @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/max.20and.20min.20delaborators/near/500701449) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge t-order t-meta	154/8	Mathlib/Order/Notation.lean,MathlibTest/Delab/SupInf.lean	2	41	['JovanGerb', 'eric-wieser', 'fpvandoorn', 'github-actions', 'kmill']	kmill assignee:kmill	1	0-42255 11 hours ago	0-42255 11 hours ago	17-32893 17 days
23972	Paul-Lez author:Paul-Lez	feat(CategoryTheory/Monoidal/Mod_): add a class version of modules over monoid objects	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric maintainer-merge t-category-theory	73/3	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean	3	25	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	1	0-37936 10 hours ago	1-32410 1 day ago	3-50796 3 days
22119	pimotte author:pimotte	feat(Combinatorics/SimpleGraph): part of Tutte's theorem	Adds three key parts of the proof of Tutte's theorem, with some supporting lemma's: - necessity of the Tutte condition (`not_isTutteViolator`) - the fact that the empty set violates the Tutte condition if the number of vertices is odd (`IsTutteViolator.empty`) - the construction of a perfect matching in a graph that decomposes into cliques (`Subgraph.IsPerfectMatching.exists_of_isClique_supp`) Definitions added: `IsTutteViolator`. --- - [x] depends on: #22125 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [Zulip thread on Tutte's](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tutte's.20theorem)	maintainer-merge t-combinatorics	195/11	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Represents.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean,Mathlib/Data/Set/Card.lean	6	47	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'pimotte']	nobody	1	0-37274 10 hours ago	0-72439 20 hours ago	23-27802 23 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	118/32	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/Pi.lean,Mathlib/Order/RelIso/Basic.lean	5	17	['IvanRenison', 'b-mehta', 'github-actions', 'plp127']	b-mehta assignee:b-mehta	1	0-36882 10 hours ago	0-36882 10 hours ago	35-71340 35 days
19865	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define extremalNumber	Define the extremal number `extremalNumber n H` of a natural number `n` and a simple graph `H`: `extremalNumber n H` is the maximum number of edges in a `H`-free simple graph on `n` vertices, if `H` is contained in all simple graphs on `n` vertices, then this is `0`. Also define the predicate that a simple graph is an extremal graph `IsExtremal` satisfying some predicate. --- - [x] depends on: #20658 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics ready-to-merge	203/5	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean	3	53	['YaelDillies', 'b-mehta', 'github-actions', 'kim-em', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mitchell-horner']	nobody	1	0-35615 9 hours ago	0-50549 14 hours ago	54-39564 54 days
24037	YaelDillies author:YaelDillies	feat: `insert (b + 1) (Ioc a b) = Ioc a (b + 1)`	And shorten recently introduced names for consistency --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	164/32	Mathlib/Algebra/Order/Interval/Finset/SuccPred.lean,Mathlib/Algebra/Order/Interval/Set/SuccPred.lean,Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	4	7	['Ruben-VandeVelde', 'b-mehta', 'github-actions']	nobody	1	0-29641 8 hours ago	0-29641 8 hours ago	4-19619 4 days
23217	acmepjz author:acmepjz	chore(AlgebraicGeometry/EllipticCurve/*): refactor VariableChange	Drop certain definitions in `VariableChange` in favor of mathlib's built-in notation: - `VariableChange.id` -> `(1 : VariableChange R)` - `VariableChange.comp C C'` -> `C * C'` - `VariableChange.inv C` -> `C⁻¹` - `W.variableChange C` -> `C • W` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discussion: [#maths > thoughts on elliptic curves @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/thoughts.20on.20elliptic.20curves/near/485467772)	t-algebraic-geometry	180/176	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	4	25	['Multramate', 'acmepjz', 'github-actions']	nobody	1	0-7186 1 hour ago	27-9565 27 days ago	27-9551 27 days
24189	urkud author:urkud	chore(*): rename `Prod.map` lemmas	Also rename some `Prod.fst` and `Prod.snd` lemmas and add 2 dot notation lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt ready-to-merge	103/40	Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Data/Set/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean	11	3	['github-actions', 'j-loreaux', 'urkud']	nobody	1	0-2556 42 minutes ago	0-2556 42 minutes ago	0-18227 5 hours
24180	urkud author:urkud	feat(Topology/CompactOpen): basis of the neighborhoods of `f : C(X, Y)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology ready-to-merge	40/7	Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Topology/CompactOpen.lean	3	2	['github-actions', 'j-loreaux', 'urkud']	nobody	1	0-2261 37 minutes ago	0-2261 37 minutes ago	0-45282 12 hours
24174	ADedecker author:ADedecker	chore: semilinearize ContinuousLinearMap.toLinearMap₂	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis ready-to-merge	8/6	Mathlib/Topology/Algebra/Module/StrongTopology.lean	1	1	['github-actions', 'j-loreaux']	nobody	1	0-1957 32 minutes ago	0-1957 32 minutes ago	0-52874 14 hours
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86305 8 months ago	310-81369 10 months ago	5-72414 5 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	261-86305 8 months ago	275-9502 9 months ago	1-73101 1 day
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	261-86302 8 months ago	443-8030 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	261-86302 8 months ago	410-58617 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	261-86301 8 months ago	283-67005 9 months ago	35-56459 35 days
6403	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'Vierkantor', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	1	261-86300 8 months ago	320-43370 10 months 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	261-86299 8 months ago	514-11085 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	242-63602 7 months ago	247-79844 8 months 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	242-52655 7 months ago	243-41802 8 months ago	7-18420 7 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$	212/174	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/Complex/AbelLimit.lean,Mathlib/Analysis/CstarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/InnerProductSpace/Basic.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/Complex/Abs.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.lean,Mathlib/Probability/Distributions/Gaussian.lean,Mathlib/Topology/ContinuousFunction/StarOrdered.lean,test/positivity.lean	31	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	1	234-77633 7 months ago	234-77633 7 months 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	1	215-12073 7 months ago	215-34048 7 months 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	193-13037 6 months ago	193-13037 6 months ago	46-5572 46 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	167-79459 5 months ago	167-79459 5 months ago	72-28392 72 days
12133	ADedecker author:ADedecker	feat: generalize instIsLowerProd to arbitrary products	Also change a bit the proof of the product case to match my own taste, feel free to tell if you prefer the old one. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	154-85507 5 months ago	154-85507 5 months ago	63-69206 63 days
17027	vihdzp author:vihdzp	feat(SetTheory/ZFC/Ordinal): von Neumann hierarchy of sets	--- - [x] depends on: #16996 - [x] depends on: #17016 - [x] depends on: #17026 - [x] depends on: #18239 - [ ] depends on: #19946 - [x] depends on: #19967 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict blocked-by-other-PR	204/29	Mathlib.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Neumann.lean,Mathlib/SetTheory/ZFC/Rank.lean	5	8	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	124-36788 4 months ago	125-27191 4 months ago	0-344 5 minutes
17176	arulandu author:arulandu	feat: integrals and integrability with .re	Lemmas for swapping order of .re and integration/integrability. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	79-47834 2 months ago	79-47834 2 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	78-63994 2 months ago	513-37281 1 year ago	4-7271 4 days
21761	JovanGerb author:JovanGerb	feat(Algebra): add lemmas `mul_self` and `add_self`	This is point (4) in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Possible.20improvements.20to.20Lean.2FMathlib/near/499085779 I decided to go with `n + n = 2 * n` instead of `n + n = n * 2` because it feels more natural. Feel free to suggest the opposite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict delegated label:t-algebra$	206/196	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1961Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/ZagierTwoSquares.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/CharZero/Lemmas.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/Language.lean,Mathlib/Data/Complex/Abs.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/Complex/Norm.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Num/Prime.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/LinearAlgebra/AffineSpace/Midpoint.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/Gamma.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/NumberTheory/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/GaussSum.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean	117	13	['JovanGerb', 'YaelDillies', 'github-actions', 'grunweg', 'mathlib-bors', 'riccardobrasca']	nobody	2	61-39388 2 months ago	61-70559 2 months ago	0-54729 15 hours
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	61-11766 2 months ago	137-4948 4 months ago	34-18388 34 days
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	1	59-11143 2 months ago	59-11143 2 months ago	52-25108 52 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. --- [![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	155/25	Mathlib.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/MLList/Split.lean,Mathlib/Data/Matrix/Bilinear.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,scripts/noshake.json	19	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	1	57-79293 1 month ago	unknown	unknown
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 maintainer-merge 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	39-50427 1 month ago	39-50427 1 month ago	43-81255 43 days
15991	vihdzp author:vihdzp	feat(SetTheory/Ordinal/CantorNormalForm): alternate CNF recursion principle	The idea of this recursion principle is that you can build an ordinal by adding one power of `b` at a time, as long as `1 < b ≤ ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	43/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	nobody	1	31-75495 1 month ago	31-75495 1 month ago	91-50443 91 days
17758	vihdzp author:vihdzp	feat(SetTheory/Ordinal/ENat): `Ordinal.toENat`	We essentially copy the `Cardinal/ENat` file but make it for ordinals instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	300/0	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	2	['Command-Master', 'github-actions', 'vihdzp']	nobody	1	31-75024 1 month ago	31-75024 1 month ago	126-40106 126 days
15915	vihdzp author:vihdzp	chore(SetTheory/Ordinal/CantorNormalForm): `CNF.exponents` and `CNF.coeffs`	We rewrite theorems about the Cantor Normal Form in terms of their lists of exponents and coefficients, instead of awkwardly talking about their first and second entries. We also put all theorems about the CNF in its own namespace. This keeps us from cluttering the `Ordinal` namespace, and it also avoids having to prefix everything by `CNF_` constantly. --- - [x] depends on: #16998 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	117/44	Mathlib/SetTheory/Ordinal/CantorNormalForm.lean	1	32	['Command-Master', 'YaelDillies', 'YnirPaz', 'digama0', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	1	29-19222 29 days ago	29-19222 29 days ago	53-79724 53 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	29-18977 29 days ago	29-18977 29 days ago	47-37012 47 days
21751	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/Arithmetic): rework `Ordinal.pred` API	This PR does the following: - give a simpler definition of `Ordinal.pred` - replace `¬ ∃ a, o = succ a` and `∀ a, o ≠ succ a` by `IsSuccPrelimit o` throughout - improve theorem names --- There's a legitimate question of whether we even want `Ordinal.pred` (see [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Ordinal.2Epred)) but this should be a good change in the meanwhile regardless. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge merge-conflict	102/67	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	2	12	['YaelDillies', 'github-actions', 'vihdzp']	nobody	1	29-15560 29 days ago	29-15560 29 days ago	36-50134 36 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	14-63838 14 days ago	14-63838 14 days 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	10-81905 10 days ago	11-15074 11 days ago	10-21608 10 days
21573	lambda-fairy author:lambda-fairy	feat(Computability): regular languages are closed under reversal	This PR proves that regular languages are closed under reversal. It works by reversing the transitions in the NFA, and proving that the resulting automaton matches the reversed language. The argument proceeds by induction on the input word, ensuring that, at each character, the state sets for the forward and reverse automaton correspond to each other. I also clean up the existing NFA module, which includes making the `M` argument implicit by default. I can revert that if it's controversial. Thank you @Rob23oba for their help with the induction proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict	75/7	Mathlib/Computability/NFA.lean	1	8	['github-actions', 'lambda-fairy', 'madvorak', 'meithecatte', 'tristan-f-r']	nobody	1	10-31535 10 days ago	44-73786 1 month ago	24-86139 24 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	8-80356 8 days ago	8-80358 8 days 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	28	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	1	5-55729 5 days ago	5-55730 5 days ago	29-60989 29 days
9105	LukasMias author:LukasMias	feat(Algebra/Algebra/Prod): add prodUnique and uniqueProd for LinearEquiv and AlgebraEquiv	This adds definitions of linear equivalences for modules `M` with their left-/right-product with a trivial module `M \times 0` and `0 \times M`, and analogous statements for Algebras. --- [![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$	64/4	Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/Logic/Equiv/Defs.lean	4	9	['LukasMias', 'eric-wieser', 'grunweg', 'mathlib-bors']	nobody	1	3-37530 3 days ago	193-13060 6 months ago	14-34450 14 days
12673	grunweg author:grunweg	feat: add ContDiff.lipschitzOnWith	A C¹ function is Lipschitz on each convex compact set. From sphere-eversion. -------- Commits can be reviewed independently. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author help-wanted	30/11	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'sgouezel']	nobody	1	1-60434 1 day ago	1-60434 1 day ago	1-7552 1 day

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
8978	eric-wieser author:eric-wieser	perf: add `extends flat` to all hom classes	I expect that [lean4#2905](https://github.com/leanprover/lean4/pull/2905) will cause this to have worse performance. --- - [ ] depends on: #8977 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	119/36	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Algebra/NonUnitalHom.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Order/Hom/Ring.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Data/FunLike/Basic.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/Order/Heyting/Hom.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/Order/Hom/CompleteLattice.lean,Mathlib/Order/Hom/Lattice.lean,Mathlib/RingTheory/Jacobson.lean,Mathlib/Topology/Algebra/ContinuousMonoidHom.lean,Mathlib/Topology/Order/Hom/Basic.lean,Mathlib/Topology/Order/Hom/Esakia.lean	19	5	['eric-wieser', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	326-3072 10 months ago	326-3124 10 months ago	0-0 0 seconds
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/)	awaiting-author	1/1	Mathlib/GroupTheory/Perm/Cycle/Concrete.lean	1	2	['eric-wieser', 'github-actions']	nobody	261-86308 8 months ago	283-35158 9 months ago	0-12793 3 hours
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-algebra awaiting-author label:t-algebra$	37/1	Mathlib/RingTheory/Flat/CategoryTheory.lean	1	3	['github-actions', 'kim-em']	nobody	261-86308 8 months ago	275-36356 9 months ago	3-28223 3 days
14345	digama0 author:digama0	feat: the Dialectica category is monoidal closed	- [x] depends on: #14274 The monoidal closed structure of the Dialectica category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86307 8 months ago	277-54311 9 months ago	12-17890 12 days
14444	digama0 author:digama0	fix(GeneralizeProofs): unreachable! bug	As [reported on Zulip](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Unreachable.20code.20reached.20in.20Lean.204.2E8.2E0/near/449286780). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	1/1	Mathlib/Tactic/GeneralizeProofs.lean	1	4	['github-actions', 'jcommelin', 'kmill']	nobody	261-86307 8 months ago	277-37477 9 months ago	10-36842 10 days
14386	Parcly-Taxel author:Parcly-Taxel	feat: the Rado graph	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics WIP	163/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Rado.lean	2	1	['github-actions']	nobody	261-86307 8 months ago	289-67475 9 months ago	0-0 0 seconds
12952	adomani author:adomani	test: length statistics	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86306 8 months ago	290-58986 9 months 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	261-86305 8 months ago	283-67005 9 months ago	0-0 0 seconds
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 WIP	94/7	Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Over.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	261-86305 8 months ago	288-42627 9 months 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	261-86305 8 months ago	unknown	unknown
11496	mcdoll author:mcdoll	feat: Topology of pointwise convergence for continuous linear maps	--- - [x] depends on: #11470 - [x] depends on: #11600 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	160/0	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Topology/Algebra/Module/PointwiseConvergence.lean	3	9	['ADedecker', 'j-loreaux', 'leanprover-community-mathlib4-bot', 'mcdoll']	ADedecker assignee:ADedecker	261-86304 8 months ago	273-64631 8 months ago	2-3432 2 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 blocked-by-other-PR WIP	51/0	Mathlib/Analysis/Distribution/DiracDelta.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	261-86304 8 months ago	326-3124 10 months ago	0-0 0 seconds
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	261-86304 8 months ago	290-58979 9 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	1	['YaelDillies']	nobody	261-86304 8 months ago	316-74262 10 months ago	58-85902 58 days
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	261-86303 8 months ago	435-30320 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	261-86303 8 months ago	316-57539 10 months 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	261-86302 8 months ago	467-74333 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	261-86302 8 months ago	423-67467 1 year ago	51-80670 51 days
9320	BoltonBailey author:BoltonBailey	chore: Golf simp calls	This script runs on a lean file or directory of lean files, and removes unnecessary lemmas from simp calls in those files. Some comments I have received about how this should work: - [ ] It should not do anything if it changes the InfoView environment, since people may have added unnecessary lemmas that make the InfoView easier to read. - [ ] It should not make any changes that make compilation slower, since some lemmas may be present for perf reasons. - [ ] It should be written in Lean rather than Python. I should look into dwrensha's [`TryAtEachStep`](https://github.com/dwrensha/tryAtEachStep) for an example of a project that analyzes tactic-by-tactic changes to a file. TODOs: - [ ] Specific golfs: - [ ] Per @alreadydone: simp only [] could be replaced by dsimp only - [ ] Remove lemmas in calls to `simp` as well as `simp only`. - [ ] Replace `simp only` with `simp_rw`. - [ ] Replace `simp_rw` with `rw` where possible. - [ ] Replace `rw [...] ; rw [...]` with one call to `rw`, and same for `simp` and friends. - [ ] More advanced: - [ ] Just delete tokens/lines/tactics willy-nilly and see if that finds anything. - [ ] Fine-tune an LLM on reviewer suggestions from Mathlib PRs. Successor to #9079. This PR focuses on removing lemmas from simp calls. It only does this for terminal simp/simp only, to avoid changing intermediate states. #9101 looks to add more features. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	151/0	scripts/golf.py	1	1	['BoltonBailey']	nobody	261-86302 8 months ago	350-32269 11 months ago	0-0 0 seconds
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	261-86302 8 months ago	456-41148 1 year ago	12-86009 12 days
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	261-86301 8 months ago	329-52830 10 months ago	0-0 0 seconds
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 awaiting-author WIP label:t-algebra$	214/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/TensorHomAdjunction.lean	2	87	['alreadydone', 'bustercopley', 'eric-wieser', 'github-actions', 'jjaassoonn', 'kbuzzard', 'kim-em']	eric-wieser assignee:eric-wieser	261-86301 8 months ago	507-65958 1 year ago	0-0 0 seconds
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	261-86301 8 months ago	598-29172 1 year ago	0-0 0 seconds
7125	eric-wieser author:eric-wieser	feat: additive monoid structure via biproducts	I suspect I'm missing a trick with these transport lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-CI WIP	237/0	Mathlib/CategoryTheory/Limits/Skeleton.lean	1	2	['alreadydone', 'eric-wieser']	nobody	261-86301 8 months ago	571-74042 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	261-86301 8 months ago	543-1425 1 year ago	0-0 0 seconds
5897	eric-wieser author:eric-wieser	feat: add a `MonadError` instance for `ContT`	We already have a `MonadExcept` instance; this promotes it to `MonadError`. This also documents an issue with the existing `MonadExcept` instance, but doesn't attempt to fix it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	35/1	Mathlib/Control/Monad/Cont.lean	1	19	['Vierkantor', 'YaelDillies', 'eric-wieser', 'github-actions', 'kmill']	nobody	261-86300 8 months ago	275-9292 9 months ago	339-53816 339 days
4786	thorimur author:thorimur	feat: AppBuilder utils	This supplements `Lean.Meta.AppBuilder`, introducing variants of `mkAppN` and `mkAppM` which allow for more fine-grained management of existing and created metavariables. [Description pending] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	205/0	Mathlib.lean,Mathlib/Lean/Meta/AppBuilder.lean	2	0	[]	nobody	261-86300 8 months ago	682-254 1 year ago	0-0 0 seconds
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 awaiting-author help-wanted	2657/0	Mathlib.lean,Mathlib/Geometry/Synthetic/Avigad/Axioms.lean,Mathlib/Geometry/Synthetic/Avigad/EuclidBookI.lean,Mathlib/Geometry/Synthetic/Avigad/Tactics.lean	4	71	['ah1112', 'alreadydone', 'eric-wieser', 'github-actions', 'tb65536', 'urkud']	nobody	261-86300 8 months ago	451-42963 1 year 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	261-86300 8 months ago	346-49794 11 months 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	256-61317 8 months ago	261-54982 8 months 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	247-80585 8 months ago	247-80639 8 months ago	0-0 0 seconds
14009	grunweg author:grunweg	chore: replace continuity -> fun_prop in remaining directories	After the current set of PRs, the only continuity remnants either need more attention or are merely for tagging continuity lemmas. --- - [x] depends on: #11092 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	6/4	Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean	2	4	['github-actions', 'j-loreaux', 'leanprover-community-mathlib4-bot']	nobody	247-261 8 months ago	247-261 8 months ago	6-67481 6 days
14563	awueth author:awueth	feat: if-then-else of exclusive or statement	--- If `¬(P ∧ Q)` then `ite (P ∨ Q) a 1 = (ite P a 1) * (ite Q a 1)` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	246-78693 8 months ago	246-78693 8 months ago	6-38745 6 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	207/0	Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean,Mathlib/Geometry/Euclidean/Volume.lean	3	2	['eric-wieser', 'github-actions']	nobody	246-76669 8 months ago	246-76669 8 months ago	0-0 0 seconds
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-algebra awaiting-author label:t-algebra$	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	246-76644 8 months ago	246-76644 8 months ago	6-6256 6 days
12581	linesthatinterlace author:linesthatinterlace	feat: (Probability/SubProbabilityMassFunction)	An experimental PR that adds subdistributions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability WIP	2369/0	Mathlib/Probability/MassFunction/Basic.lean,Mathlib/Probability/MassFunction/Constructions.lean,Mathlib/Probability/MassFunction/Coupling.lean,Mathlib/Probability/MassFunction/Measure.lean,Mathlib/Probability/MassFunction/Monad.lean	5	63	['github-actions']	nobody	246-76229 8 months ago	246-76229 8 months ago	0-0 0 seconds
12103	BoltonBailey author:BoltonBailey	feat: Berlekamp-Welch	Implementation of the Berlekamp-Welch Decoding procedure, and proof of its correctness within the decoding radius. Todos: - [ ] Integrate with coding theory part of library - [ ] Gaussian Elimination lives in `Mathlib/Tactic/Linarith/SimplexAlgorithm/Gauss.lean`, may need facts about it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	78/0	Mathlib/Algebra/Polynomial/BerlekampWelch.lean	1	0	[]	nobody	246-76189 8 months ago	246-76189 8 months ago	0-0 0 seconds
9406	wupr author:wupr	feat: Inverse limits of modules, abelian groups, and rings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	174/0	Mathlib/Algebra/InverseLimit.lean	1	8	['alreadydone', 'erdOne', 'wupr']	nobody	246-76042 8 months ago	246-76042 8 months ago	0-0 0 seconds
9181	linesthatinterlace author:linesthatinterlace	feat(Data/Option/Order): Add default order structure to Option with `none` incomparable	--- There is some context around this PR - and some good reasons not to merge it, as well as reasons to merge it. In summary: as of writing the order structure that exists on `Option` is the same as the one that exists on `WithBot` - that is, with `none < some k` for alll k - but with no API around in. leanprover/lean4#3102 removes this existing instance from core. leanprover/std4#473 adds in `StrictRel`, which allows defining a strict relation in the "default" way intended by this. #9178, which this does not depend on, removes something related. Also see leanprove/lean4#3100 for the underlying bug in core which defines an LT instance for Option at an extremely basic level. In a sense there are four obvious choices for an order on `Option`. These are a) don't have one b) have this one, with `none <= none` but no other relations. This allows Option to inherit partial order structures, but means it is not a total order. c) have `none < some k` for all k and `none <= none`, as `WithBot` does. This gives a lot of great order properties. d) The dual of that - this is `WithTop`. It's also fine. I would argue that, implictly, by having `WithBot` and `WithTop`, we have rejected c) and d). The question is, which of a) or b) is better for Mathlib? And is c) actually rejected? The issue is that c) is, in some sense, more standard in computer science. There are good reasons to want `Option` to be equipped with a total order if possible. Sure, from a mathematical point of view, `WithBot` is a better name for this thing, but for some people, it is intuitive that `none < some k` - essentially because their intuition is about total orders. b) has a lot to credit it, if we reject c) and d). It is useful to use `Option` for things like partial functions (indeed, this is what I was doing when I discovered we had an ambiguous approach to this currently). I would like to inherit partial order structure, to let me use basic lemmas like transitivity of <= in my reasoning. It is good to have some API to make the order usable. If we are going to make an order available, this one is the "minimum" over the three possible orders, in the sense that it adds the least relations between elements: in this sense it is a closure of a kind. Then there is a). We could just not define an order on Option at all! But this makes neither the computer scientists nor the mathematicians happy, really. Even if we don't have it, it is probably useful to have the incomprable order in as a type synonym. This PR starts from a POV of implementing b), through it could be retrofitted to a) if needed, in which case it would be a good start for adding a `WithDefault` or whatever one wants to call it. There is a remaining question about whether std4 or even core might be better places to define any default order. Certainly I considered making this a PR to std4. Discussion on these topics has taken place in the following Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/Preorder.20on.20Option. I suggest any discussion of these meta questions also ends up there (though it hasn't happened yet). - [ ] depends on: leanprover/lean4#3102 - [ ] depends on: leanprover/std4#473 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC awaiting-CI blocked-by-other-PR WIP	279/0	Mathlib/Data/Option/Order.lean	1	4	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	246-75956 8 months ago	246-75956 8 months ago	0-0 0 seconds
11106	BoltonBailey author:BoltonBailey	feat: file for lemmas about MvPolynomials over NoZeroDivisors	WIP See discussion from #11073 --- - [x] depends on: #11095 - [x] depends on: #11094 - [ ] depends on: #12664 [We need this lemma to establish fact about degreeOf n (p + q)] [![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$	85/0	Mathlib/Algebra/MvPolynomial/NoZeroDivisors.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	246-75886 8 months ago	246-75886 8 months ago	0-0 0 seconds
9040	BoltonBailey author:BoltonBailey	feat: `to_snoc` an attribute for generating lemmas with snoc in them	This is an experimental PR for a new attribute which is basically `to_additive`, but instead of changing multiplication to addition, it changes `cons` to `snoc`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta please-adopt WIP help-wanted	1292/0	Mathlib/Tactic/ToSnoc.lean	1	0	[]	nobody	246-75842 8 months ago	246-75842 8 months ago	0-0 0 seconds
10387	adomani author:adomani	feat(Tactic/ComputeDegree): add `polynomial` tactic	Introducing the `polynomial` tactic, summing up `compute_degree, monicity` and adding support for `leadingCoeff`. This is more of a proof of concept: if there is interest in this tactic, I can polish it up. See [this Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Compute.20roots.20of.20polynomials/near/420713624). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	RFC t-meta WIP	24/0	Mathlib/Tactic/ComputeDegree.lean	1	0	[]	nobody	246-75841 8 months ago	246-75841 8 months 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	246-75756 8 months ago	246-75756 8 months ago	0-0 0 seconds
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/)	t-analysis WIP help-wanted	330/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/AffineSubspace.lean	2	4	['MithicSpirit', 'eric-wieser']	MithicSpirit assignee:MithicSpirit	246-75507 8 months ago	246-75507 8 months 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	246-75366 8 months ago	246-75366 8 months ago	66-6720 66 days
7322	BoltonBailey author:BoltonBailey	feat: Default list	Generalizes `ListBlank` to use a specified default, rather than the one supplied by `Inhabited`, with an eye to using this type to represent computable polynomials. This is a forward port of this [mathlib 3 PR](https://github.com/leanprover-community/mathlib/pull/16160) TODOs: - [ ] Replace ListBlank in TuringMachine.lean with this (see comment below) - [ ] Make sure imports are minimal and alphabetical --- - [x] depends on: #7307 - [x] depends on: #7323 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability please-adopt WIP	600/0	Mathlib/Computability/ListBlank.lean	1	3	['BoltonBailey', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	246-75346 8 months ago	246-75346 8 months ago	0-0 0 seconds
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	246-75328 8 months ago	246-75329 8 months ago	0-0 0 seconds
7172	BoltonBailey author:BoltonBailey	feat: Composition of Turing machines	This PR defines the composition operation on Turing machines. A port of [this mathlib3 PR](https://github.com/leanprover-community/mathlib/pull/12993). The implementation is currently incomplete. Feel free to try your hand at completing it, and if you make progress, feel free to commit to this branch. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability awaiting-CI please-adopt WIP good first issue	28/0	Mathlib/Computability/TMComputable.lean	1	9	['Shreyas4991', 'github-actions', 'urkud']	nobody	246-75323 8 months ago	246-75323 8 months 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	246-74155 8 months ago	246-74155 8 months 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	245-53219 8 months ago	245-53219 8 months 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	245-53205 8 months ago	245-53205 8 months 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	243-386 8 months ago	243-388 8 months ago	18-13508 18 days
11207	luigi-massacci author:luigi-massacci	feat(Topology/MetricSpace): Add new file with type of Katetov maps	add a type of Katetov maps (one point extensions of a metric) and related notation and FunLike coercions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology WIP	138/0	Mathlib.lean,Mathlib/Topology/MetricSpace/Katetov.lean,docs/references.bib	3	16	['fpvandoorn', 'jcommelin', 'kim-em', 'luigi-massacci', 'urkud']	nobody	242-63070 7 months ago	344-65155 11 months ago	26-83567 26 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	242-62945 7 months ago	246-75871 8 months 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	240-65721 7 months ago	455-85188 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	239-73438 7 months ago	261-74094 8 months ago	7-80557 7 days
15786	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/NumberField/Height): define heights on Weierstrass curves	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-number-theory WIP	650/0	Mathlib/AlgebraicGeometry/EllipticCurve/NumberField/Height.lean	1	2	['Multramate', 'github-actions']	nobody	238-81966 7 months ago	248-34496 8 months ago	0-0 0 seconds
11385	BoltonBailey author:BoltonBailey	feat: scripts to analyze overlap between namespaces	TODOs: - [ ] Translate to Lean - [ ] Put in Utils directory --- - [x] depends on: #12322 [When this is rewritten in Lean, it would be good to output data in the form of a table] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP	86/0	scripts/RecordNamespaces.lean,scripts/namespace-overlap.py	2	1	['leanprover-community-mathlib4-bot']	nobody	232-64250 7 months ago	unknown	unknown
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	232-45487 7 months ago	232-45487 7 months 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	229-75492 7 months ago	229-75492 7 months 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	229-38437 7 months ago	260-84096 8 months 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	228-55230 7 months ago	233-2339 7 months ago	1-43047 1 day
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 awaiting-author	76/0	Mathlib/Combinatorics/SimpleGraph/Metric.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	228-23956 7 months ago	228-23956 7 months ago	1-68738 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	221-62096 7 months ago	222-20944 7 months 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	220-54088 7 months ago	372-66826 1 year ago	55-82183 55 days
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 blocked-by-other-PR WIP	287/0	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	219-1043 7 months ago	219-1043 7 months ago	0-0 0 seconds
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	190/0	Mathlib.lean,Mathlib/Dynamics/Ergodic/Conservative.lean,Mathlib/Dynamics/Ergodic/Dissipative.lean,Mathlib/MeasureTheory/MeasurableSpace/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	218-5926 7 months ago	218-5926 7 months ago	0-0 0 seconds
14704	Command-Master author:Command-Master	feat(FieldTheory): define typeclass for simple extensions, and prove some properties	Define `SimpleExtension F K`, which says that `K` is a simple field extension of `F`, and show that together with transcendentality it implies `IsFractionRing F[X] K`. --- - [x] depends on: #14710 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	215-81538 7 months ago	215-81538 7 months 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 awaiting-author	286/1	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Probability/Distributions/Beta.lean	3	48	['EtienneC30', 'arulandu', 'github-actions', 'vihdzp']	arulandu assignee:arulandu	210-85054 6 months ago	215-81772 7 months ago	1-21124 1 day
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	20	['Vierkantor', 'YaelDillies', 'github-actions', 'js2357', 'kbuzzard', 'leanprover-community-mathlib4-bot']	Vierkantor assignee:Vierkantor	206-63898 6 months ago	206-64016 6 months ago	26-39463 26 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/)	t-computability new-contributor awaiting-author	307/5	Mathlib/Computability/NFA.lean	1	13	['TpmKranz', 'YaelDillies', 'dupuisf', 'github-actions']	nobody	205-75507 6 months ago	206-62436 6 months ago	45-84611 45 days
16041	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Arithmetic): `Ordinal.toNat`	A simple function sending ordinals less than `ω` to themselves, and anything else to `0`. --- - [ ] depends on: #17758 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic awaiting-author blocked-by-other-PR WIP	58/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean	1	4	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud', 'vihdzp']	nobody	186-12949 6 months ago	186-12951 6 months ago	54-31491 54 days
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	180-85469 5 months ago	422-77538 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	178-57439 5 months ago	178-57439 5 months ago	31-44440 31 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 please-adopt awaiting-author label:t-algebra$	78/0	Mathlib/LinearAlgebra/UnitaryGroup.lean	1	7	['chrisflav', 'jcommelin']	nobody	170-63057 5 months ago	170-63057 5 months ago	9-22007 9 days
18252	callesonne author:callesonne	feat(Bicategory/Oplax): Fix simp lemmas and renaming	This PR renames `OplaxNatTrans` to `OplaxTrans` and puts it in the `Oplax` namespace (as there should also be oplax natural transformations between lax functors, so this is more fitting). It also removes `@[simp]` from `OplaxTrans.id` and `OplaxTrans.vcomp`, and instead adds `@[simp!]` to the `CategoryStruct` instance. This is needed as for example, right now, in order to prove that `(η ≫ θ).app a = η.app a ≫ θ.app a` simp needs to first convert this to `(OplaxTrans.vcomp η θ).app a` which is not ideal (in particular it converts `(η ≫ θ)` to `OplaxTrans.vcomp η θ`). This is part of some of the restructuring that I want to do before constructing the bicategory of pseudofunctors. --- - [x] depends on: #18250 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	104/117	Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean	3	8	['Ruben-VandeVelde', 'callesonne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	170-39081 5 months ago	170-39081 5 months ago	3-36411 3 days
13611	callesonne author:callesonne	feat(FiberedCategory/HasFibers): define HasFibers class	We define a class `HasFibers p` for a given functor `p : 𝒳 ⥤ 𝒮`. The point of this is to give the user the option to supply their own fiber categories, as often the standard fibers will not be definitionally the same as the (equivalent) categories one is interested in. Co-authored-by: Paul Lezeau --- This is the final PR in a sequence of PRs developing the theory of fibered categories that I will make for now. I will wait for the reviewing to catch up before I start working on more of these again, so as to not create too big of a backlog. - [x] depends on: #13603 - [x] depends on: #12982 - [x] depends on: #13416 - [x] depends on: #13410 - [x] depends on: #13393 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	284/21	Mathlib.lean,Mathlib/CategoryTheory/FiberedCategory/Cartesian.lean,Mathlib/CategoryTheory/FiberedCategory/HasFibers.lean,Mathlib/CategoryTheory/FiberedCategory/HomLift.lean	4	17	['callesonne', 'github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	Paul-Lez assignee:Paul-Lez	170-38530 5 months ago	181-65292 5 months ago *	0-571 9 minutes *
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	164-53998 5 months ago	164-53998 5 months ago	0-0 0 seconds
18472	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `Comm.to` instances	`CommRing.toRing` is an exception. `CommRing` is so important that it needs to be looked up early. An important goal of #7873 is also to search for `Zero/One/Add/Mul` instances first along `Zero/One/Add/Mul` -> ... -> `Ring` -> `CommRing` -> `Field`. --- - [ ] depends on: #18474 - [ ] depends on: #18641 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	33/10	Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/Data/Int/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/NumberTheory/LegendreSymbol/GaussEisensteinLemmas.lean,Mathlib/NumberTheory/NumberField/Discriminant/Defs.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/Topology/MetricSpace/Polish.lean	14	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	163-35624 5 months ago	163-47203 5 months ago	0-258 4 minutes
18464	FR-vdash-bot author:FR-vdash-bot	perf: lower the priority of `toMul` and `toAdd` instances	A subsequent PR will try to swap the priorities of `Semigroup.toMul` and `MulOneClass.toMul` to see if it gets better. --- - [ ] depends on: #18472 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	38/12	Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/GroupWithZero/Defs.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Ext.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	163-19637 5 months ago	170-31859 5 months ago	0-8515 2 hours
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 awaiting-author	174/60	Mathlib/ModelTheory/Complexity.lean,Mathlib/ModelTheory/Equivalence.lean,Mathlib/ModelTheory/Types.lean	3	29	['YaelDillies', 'awainverse', 'github-actions', 'mathlib4-dependent-issues-bot', 'metinersin']	YaelDillies assignee:YaelDillies	160-37255 5 months ago	168-77074 5 months ago	29-26213 29 days
18914	Vierkantor author:Vierkantor	fix(Tactic/Linter): the `minImports` linter understands file edits	Previously, the `minImports` linter stored the state of the last command to be elaborated. This does not work if we edit a file, so we should instead store state per command, and look up the correct command to continue from. Since editing a file will restart elaboration at the command that started before the edit, if we track the ending position of a command, we know which commands are before and after the edit. I tested the changes manually (and tweaked the exact edit detection algorithm) with many edits to `MathlibTests/MinImports.lean` but I wouldn't know an automated way of doing tests here, unfortunately. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter t-meta WIP	80/10	Mathlib/Tactic/Linter/MinImports.lean	1	4	['Vierkantor', 'github-actions', 'grunweg']	nobody	157-58615 5 months ago	157-58655 5 months ago	0-4951 1 hour
15809	archiebrowne author:archiebrowne	feat(RingTheory/MvPolynomial/Ideal): introduce new lemmas about MvPolynomial Ideals	Four new lemmas about MvPolynomialIdeals `sub_span_span_sub`, `span_eq_iff_basis_sub`, `mem_basis_mem_span`, `mem_span_exists_dvd_mem_basis`. --- [![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$	38/0	Mathlib/RingTheory/MvPolynomial/Ideal.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	151-60223 5 months ago	206-62143 6 months ago	41-7533 41 days
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 please-adopt WIP label:t-algebra$	588/0	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/SVD/Defs.lean,Mathlib/LinearAlgebra/Matrix/SVD/Reindex.lean	3	114	['MohanadAhmed', 'Vierkantor', 'alexjbest', 'eric-wieser', 'j-loreaux', 'jcommelin', 'sgouezel']	nobody	151-49789 5 months ago	151-49799 5 months ago	181-72917 181 days
11820	eric-wieser author:eric-wieser	feat(Algebra/Star/Unitary): add unitarySubgroup	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	44/0	Mathlib/Algebra/Star/Unitary.lean	1	5	['eric-wieser', 'j-loreaux']	j-loreaux assignee:j-loreaux	151-48607 5 months ago	377-11754 1 year ago	5-19391 5 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 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	3	['Parcly-Taxel', 'adomani', 'github-actions']	nobody	147-80235 4 months ago	147-80235 4 months ago	0-16 16 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	147-3092 4 months ago	148-78447 4 months ago	0-1356 22 minutes
19552	grunweg author:grunweg	perf: disable the multi-goal linter	DO NOT MERGE, just for benchmarking purposes. Similar to #19547. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter WIP	1/1	Mathlib/Tactic/Linter/Multigoal.lean	1	5	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	141-83535 4 months ago	141-83535 4 months ago	0-0 0 seconds
19551	grunweg author:grunweg	perf: TRY disabling ALL syntax style linters, see what the effect is	Opening for comparison with #19547: this PR disables all syntax style linters (the five linters rewritten in that PR, and two more). Let's see if these linters have any significant effect whatsoever. --- Once CI is complete, help benchmarking this is welcome. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter WIP	7/7	Mathlib/Tactic/Linter/Style.lean	1	5	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	141-83522 4 months ago	141-83522 4 months ago	0-0 0 seconds
19556	grunweg author:grunweg	perf: disable the unused tactic linter	DO NOT MERGE, just for benchmarking purposes --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-linter WIP	1/1	Mathlib/Tactic/Linter/UnusedTactic.lean	1	3	['github-actions', 'grunweg', 'leanprover-bot']	nobody	141-80006 4 months ago	141-84021 4 months ago	0-0 0 seconds
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	120/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,scripts/olean_comparison.sh	5	49	['Vtec234', 'YaelDillies', 'adomani', 'bryangingechen', 'github-actions', 'grunweg', 'kim-em', 'mattrobball']	nobody	141-66875 4 months ago	141-66875 4 months ago	237-43370 237 days
19557	grunweg author:grunweg	perf: disable five small syntax style linters	DO NOT MERGE: just to see what the performance effect is Related to #19547. does not touch the longLine or longFile linters, a benchmarking including them was conducted in #19551. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-linter WIP	5/5	Mathlib/Tactic/Linter/Style.lean	1	3	['github-actions', 'grunweg', 'leanprover-bot']	nobody	141-65050 4 months ago	141-84009 4 months ago	0-0 0 seconds
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	132-69955 4 months ago	158-59925 5 months ago	0-37 37 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/)	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	5	['github-actions', 'mathlib4-dependent-issues-bot', 'trivial1711']	nobody	132-14819 4 months ago	132-14819 4 months ago	23-54870 23 days
19633	grunweg author:grunweg	fix(CI): build the Archive and Counterexamples with --wfail also	This appears to be an oversight --- which has no consequences right now (the check for noisy output later would catch any warnings), but fixing it doesn't hurt either. [Zulip discussion](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/No.20.60--wfail.60.20when.20building.20archive). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI awaiting-CI easy delegated	20/8	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml	4	5	['adomani', 'github-actions', 'grunweg', 'kim-em', 'mathlib-bors']	nobody	130-22791 4 months ago	130-22791 4 months ago	7-42070 7 days
19972	jjdishere author:jjdishere	feat(RingTheory): Perfectoid Field	We define perfectoid field and its tilt. Mimicking Polish space, we define `PerfectoidField` and `ValuedPerfectoidField`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis t-topology WIP label:t-algebra$	150/0	Mathlib/RingTheory/Perfectoid.lean	1	1	['github-actions']	nobody	125-14004 4 months ago	125-14081 4 months ago	0-0 0 seconds
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 WIP	34/4	Mathlib/Tactic/Simps/Basic.lean	1	10	['FrederickPu', 'YaelDillies', 'fpvandoorn', 'github-actions']	nobody	121-42281 4 months ago	121-77390 4 months ago	0-34081 9 hours
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	120-28172 3 months ago	125-24987 4 months 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 WIP label:t-algebra$	180/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/FunctorOfNatTrans.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	119-50623 3 months ago	119-50661 3 months ago	0-0 0 seconds
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 WIP label:t-algebra$	248/0	Mathlib.lean,Mathlib/RingTheory/FractionalIdeal/LocalizedAtPrime.lean	2	1	['github-actions']	nobody	116-36677 3 months ago	116-36677 3 months ago	0-21 21 seconds
18893	vihdzp author:vihdzp	feat(Order/InitialSeg): `InitialSeg.exists_relIso_sum`	If `r` is an initial segment of `s`, there exists some other relation `t` with `Sum.Lex r t ≃r s`. --- - [x] depends on: #17989 - [ ] depends on: #20409 The names `sumLexLtLE` and `sumLexLeLT` are very sketch, and better suggestions are welcome. Likewise it'd be cool if anyone can figure out how to golf these results. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author blocked-by-other-PR	102/10	Mathlib/Order/InitialSeg.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/SetTheory/Ordinal/Basic.lean	4	12	['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	106-20761 3 months ago	106-20762 3 months ago	46-65043 46 days
20428	madvorak author:madvorak	feat(Data/Sign): lemmas about `∈ Set.range SignType.cast`	--- Perhaps `in_set_range_singType_cast_iff_abs` needs to be moved somewhere downstream.	t-data WIP	40/0	Mathlib/Data/Sign.lean	1	9	['eric-wieser', 'github-actions', 'madvorak']	nobody	105-46284 3 months ago	105-78687 3 months ago	0-0 0 seconds
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	331/0	.github/build.in.yml,.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build_fork.yml,lakefile.lean,scripts/README.md,scripts/check-title-labels.lean	7	39	['Command-Master', 'adomani', 'bryangingechen', 'edegeltje', 'github-actions', 'grunweg', 'joneugster']	bryangingechen assignee:bryangingechen	104-37840 3 months ago	104-37840 3 months ago	78-54824 78 days
20409	vihdzp author:vihdzp	feat: linear order is isomorphic to lexicographic sum of two intervals	--- The material in this PR was previously in #18893. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	169/2	Mathlib.lean,Mathlib/Data/Sum/Order.lean,Mathlib/Logic/Equiv/Set.lean,Mathlib/Order/Hom/Lex.lean,Mathlib/Order/Hom/Set.lean	5	21	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	nobody	103-42664 3 months ago	104-40663 3 months ago	104-70002 104 days
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/)		57/25	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean	1	2	['eric-wieser', 'github-actions']	nobody	103-24040 3 months ago	103-27775 3 months ago	0-0 0 seconds
18693	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add ConjRootClass	Co-authored-by: FR --- 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$	199/0	Mathlib.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean	3	6	['Vierkantor', 'alreadydone', 'github-actions']	nobody	101-80511 3 months ago	101-80511 3 months ago	61-68166 61 days
20459	Ruben-VandeVelde author:Ruben-VandeVelde	chore: fix names of roots_C_mul_X_{add,sub}_C_of_IsUnit	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	100-55525 3 months ago	100-55525 3 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	100-43282 3 months ago	234-64647 7 months ago	144-63944 144 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 WIP	336/22	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/Matrix.lean,Mathlib/Analysis/Calculus/FDeriv/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Matrix.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	98-65563 3 months ago	115-78492 3 months ago	0-0 0 seconds
13483	adomani author:adomani	feat: automatically replace deprecations	This PR introduces `lake exe update_deprecations` that uses the cache to automatically replace deprecated declarations with the corresponding un-deprecated one. The script handles namespacing, replacing a possibly non-fully-qualified, deprecated name with the fully-qualified non-deprecated name. It is also possible to use ```bash lake exe update_deprecations --mods One.Two.Three,Dd.Ee.Ff ``` to limit the scope of the replacements to the modules `One.Two.Three` and `Dd.Ee.Ff`. This is intended to be a first step in automating updates: combining this with a linter that emits appropriate warnings, the functionality of `lake exe update_deprecations` can be extended to perform more complicated updates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta 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	15	['YaelDillies', 'adomani', 'github-actions', 'j-loreaux', 'jcommelin', 'mathlib-bors', 'sgouezel']	joneugster assignee:joneugster	98-57583 3 months ago	98-57583 3 months ago	34-82472 34 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	97-59560 3 months ago	97-59560 3 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	95-66222 3 months ago	105-68820 3 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	88-81974 2 months ago	88-81974 2 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	88-68739 2 months ago	89-69692 2 months ago	2-77310 2 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 delegated WIP	22/1	.github/workflows/PR_summary.yml,scripts/zulip_emoji_merge_delegate.py	2	9	['adomani', 'github-actions']	nobody	86-43541 2 months ago	86-43541 2 months ago	0-0 0 seconds
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 WIP	390/10	Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	86-1084 2 months ago	86-1252 2 months ago	0-530 8 minutes
13973	digama0 author:digama0	feat: lake exe refactor, initial framework	This is the initial framework code for `lake exe refactor`. To use it, you add your refactoring to `Refactor/Main.lean` (note, you have to actually write some metaprogramming code here for the refactoring itself), and the harness will run it on specified files and apply the generated edits. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	139/0	Refactor/Main.lean,lakefile.lean	2	10	['adomani', 'digama0', 'eric-wieser', 'github-actions', 'joneugster', 'mattrobball']	nobody	85-59599 2 months ago	247-65926 8 months ago	4-80741 4 days
17589	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 pushforward (in which case they are `rfl`). --- - [x] depends on: #17366 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-category-theory WIP	166/2	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.lean	4	4	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	85-49405 2 months ago	85-49424 2 months ago	0-0 0 seconds
21009	vihdzp author:vihdzp	feat(Logic/Relation): more `TransGen` lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic t-order awaiting-author	13/0	Mathlib/Logic/Relation.lean	1	2	['b-mehta', 'github-actions']	nobody	84-64377 2 months ago	84-64377 2 months ago	0-39342 10 hours
21035	mattrobball author:mattrobball	draft	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	3/3	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	84-34917 2 months ago	84-36756 2 months ago	0-0 0 seconds
15443	YaelDillies author:YaelDillies	feat: The 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	189/0	Mathlib.lean,Mathlib/Probability/MarcinkiewiczZygmund.lean	2	39	['Parcly-Taxel', 'YaelDillies', 'b-mehta', 'github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	83-82719 2 months ago	84-1383 2 months ago	89-28229 89 days
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 please-adopt	40/4	Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/RingTheory/Ideal/Maximal.lean,Mathlib/Tactic/FastInstance.lean,Mathlib/Topology/FiberBundle/Basic.lean	4	1	['github-actions']	nobody	83-61786 2 months ago	83-61786 2 months ago	0-0 0 seconds
20466	MohanadAhmed author:MohanadAhmed	feat: Sherman Morrison formula for rank 1 update of the matrix inverse	Provides the Sherman Morrison rank 1 update of the matrix inverse https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author	37/0	Mathlib/Data/Matrix/Invertible.lean	1	4	['eric-wieser', 'github-actions']	nobody	81-62242 2 months ago	81-62242 2 months ago	23-30991 23 days
16547	CBirkbeck author:CBirkbeck	Cot mittag leffler	We prove the Mittag-Leffler series expansion for `cot(pi z)`. --- - [ ] depends on: #13349 - [x] depends on: #16541 - [x] depends on: #16545 - [x] depends on: #16544 - [x] depends on: #16542 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import blocked-by-other-PR WIP	385/1	Mathlib.lean,Mathlib/Analysis/Complex/IntegerCompl.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Topology/Algebra/InfiniteSum/MultipliableTendstoUniformly.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean	5	4	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	79-55431 2 months ago	86-60490 2 months ago	0-529 8 minutes
20818	artie2000 author:artie2000	feat(Algebra/Group/Even): Add missing lemmas	* Make API for `IsSquare` / `Even` consistent between the "official" definition and equivalent ones * Add new lemma `exists_apply_eq_and_isSquare ` that's analogous to `IsSquare.map` --- - [x] depends on: #20558 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra awaiting-author label:t-algebra$	39/28	Mathlib/Algebra/Group/Even.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Operations.lean	3	25	['YaelDillies', 'alreadydone', 'artie2000', 'github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	79-50521 2 months ago	81-50903 2 months ago	0-3431 57 minutes
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	78-38699 2 months ago	88-51153 2 months ago	73-63475 73 days
21277	GabinKolly author:GabinKolly	feat(ModelTheory/PartialEquiv): Define the mapping of a self-partialEquiv through an embedding	Define the mapping of a self-partialEquiv through an embedding and the notion of fully extendable partialEquiv. --- This is some preparatory work for #18876 - [ ] depends on: #21276 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	78-38423 2 months ago	78-38425 2 months ago	0-668 11 minutes
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	76-34558 2 months ago	98-32199 3 months ago	0-0 0 seconds
19632	edegeltje author:edegeltje	WIP CI	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI WIP	103/0	.github/workflows/on_pr_comment.yaml	1	1	['github-actions']	nobody	75-64828 2 months ago	75-64828 2 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	74-53141 2 months ago	74-53144 2 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	73-12779 2 months ago	73-12779 2 months ago	0-0 0 seconds
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	73-6110 2 months ago	73-6112 2 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	71-79101 2 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	71-73191 2 months ago	71-73191 2 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	71-72960 2 months ago	71-72960 2 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	70-19965 2 months ago	70-38139 2 months ago	2-69252 2 days
20520	linesthatinterlace author:linesthatinterlace	refactor(LinearAlgebra/Lagrange): Remove Lagrange namespace	This file originally had a separate namespace for Lagrange, and I didn't change this when I did my refactor back in 2022. On reflection I think it would be better to make this change: I just do not think this namespace is ever going to be used by anything else and it's an odd lacuna. Moves: - Lagrange.* -> Polynomial.* - Lagrange.basis -> Polynomial.lagrangeBasis --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	36/44	Mathlib/LinearAlgebra/Lagrange.lean,docs/undergrad.yaml	2	3	['github-actions', 'linesthatinterlace', 'loefflerd']	nobody	68-48499 2 months ago	68-48499 2 months ago	34-9523 34 days
21662	erdOne author:erdOne	WIP: Weierstrass elliptic functions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	1595/0	Mathlib/Analysis/Elliptic/Basic.lean	1	1	['github-actions']	nobody	67-61457 2 months ago	67-61458 2 months ago	0-0 0 seconds
13685	niklasmohrin author:niklasmohrin	feat(Combinatorics): add definitions for network flows	Although we might not have any super-interesting results ready for mathlib yet, I feel that the definitions from this commit are already mature enough to include. These definitions are ported from last semester's work we did at https://github.com/niklasmohrin/lean-seminar-2023 and I have put some time in to refactor our code to `Int` and now to any parameter `R`. In the linked repository, there is some more stuff that I can send in. One obstacle without integer values is that it is not clear why a maximum flow would exist. I think the best way to tackle this would be to prove max-flow-min-cut theorem and implement the Ford-Fulkerson algorithm. It has been pointed out on Zulip that there is an [Isabelle formalization of the Edmonds Karp Algorithm](https://www.isa-afp.org/entries/EdmondsKarp_Maxflow.html). I feel that the definitions are pretty solid and it makes sense to include them, even if just for unifying definitions across downstream projects. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	244/0	Mathlib.lean,Mathlib/Combinatorics/Flow/Basic.lean,docs/references.bib	3	56	['Shreyas4991', 'YaelDillies', 'b-mehta', 'github-actions', 'madvorak', 'niklasmohrin']	nobody	67-3365 2 months ago	67-3365 2 months ago	86-21072 86 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 awaiting-author WIP	2/1	.github/workflows/PR_summary.yml	1	1	['github-actions']	nobody	66-42293 2 months ago	66-42293 2 months ago	0-6023 1 hour
21776	alreadydone author:alreadydone	Invertible modules	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		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	2	['alreadydone', 'github-actions']	nobody	65-17525 2 months ago	66-3750 2 months 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: #21837 (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 blocked-by-other-PR label:t-algebra$	736/14	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	3	['erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	64-46680 2 months ago	64-50454 2 months ago	43-23183 43 days
20722	ctchou author:ctchou	feat(Counterexamples): the Vitali set is non-measurable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability please-adopt awaiting-author	258/3	Counterexamples.lean,Counterexamples/VitaliSetNotMeasurable.lean,Mathlib/MeasureTheory/Measure/NullMeasurable.lean,docs/1000.yaml	4	74	['ctchou', 'github-actions', 'grunweg', 'vihdzp']	vihdzp assignee:vihdzp	64-37763 2 months ago	86-23371 2 months ago	0-0 0 seconds
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 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', 'mathlib4-dependent-issues-bot']	nobody	63-49805 2 months ago	unknown	unknown
21265	ADedecker author:ADedecker	feat: some lemmas about pointwise actions of units on filters and uniformities	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology delegated label:t-algebra$	45/0	Mathlib/Order/Filter/Pointwise.lean,Mathlib/Topology/Algebra/UniformMulAction.lean	2	7	['github-actions', 'mathlib-bors', 'ocfnash']	nobody	63-41112 2 months ago	63-41112 2 months ago	15-25642 15 days
21871	YaelDillies author:YaelDillies	feat: decomposition into independent atoms	Prove that any element in a compactly generated modular atomistic lattice (eg the lattice of submodules of a module) can be written as the supremum of independent atoms. From PersistentDecomp and Xena --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order help-wanted	114/20	Mathlib/Data/Set/Insert.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/CompactlyGenerated/Basic.lean	3	2	['github-actions']	nobody	62-44968 2 months ago	63-71270 2 months ago	0-15 15 seconds
20784	eric-wieser author:eric-wieser	fix: prevent `exact?` recursing forever on `n = 55`	Test case thanks to @llllvvuu: ```lean import Mathlib.SetTheory.Ordinal.Basic theorem natCast_inj {m n : ℕ} : (m : Ordinal) = n ↔ m = n := sorry example (n : Nat) : n = 55 := by exact? ``` This is surely a workaround for some unreported lean bug. The bug still exists for `n = 71` or higher, so we can still track down the bug after merging this patch. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-author	22/3	Mathlib/SetTheory/Ordinal/Basic.lean,MathlibTest/LibrarySearchRecDepth.lean	2	12	['Command-Master', 'eric-wieser', 'github-actions', 'kbuzzard', 'kim-em', 'leanprover-bot', 'mattrobball']	nobody	60-41634 2 months ago	60-41634 2 months ago	32-73698 32 days
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	7/1	Mathlib/Data/Finset/Defs.lean,Mathlib/MeasureTheory/Constructions/Projective.lean	2	1	['github-actions']	nobody	59-77988 2 months ago	59-78040 2 months ago	0-0 0 seconds
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/)	t-computability new-contributor	490/0	Mathlib.lean,Mathlib/Computability/RegularExpressionsToEpsilonNFA.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	59-24515 2 months ago	59-24528 2 months ago	59-26324 59 days
22092	fpvandoorn author:fpvandoorn	perf: lower gcongr priority in group mono lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	13/9	Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean	1	5	['fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	58-48071 1 month ago	58-48156 1 month ago	0-6118 1 hour
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	58-34502 1 month ago	63-16098 2 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	58-33581 1 month ago	58-33581 1 month ago	13-33168 13 days
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 WIP	55/28	Mathlib/Analysis/Calculus/TangentCone.lean	1	15	['ADedecker', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	58-15620 1 month ago	58-15620 1 month ago	23-20319 23 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	57-43499 1 month ago	86-57012 2 months ago	0-41 41 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	55	['eric-wieser', 'girving', 'github-actions', 'tomaz1502']	nobody	55-22274 1 month ago	86-57039 2 months ago	86-57034 86 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	54-74838 1 month ago	55-29326 1 month ago	0-0 0 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	54-18197 1 month ago	54-18199 1 month 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	54-18195 1 month ago	54-18198 1 month ago	0-414 6 minutes
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	194/26	Mathlib/Tactic/ScopedNS.lean,MathlibTest/scopedNS.lean	2	6	['adomani', 'digama0', 'github-actions', 'joneugster', 'kbuzzard']	nobody	53-76440 1 month ago	53-76440 1 month ago	41-32344 41 days
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	36	['alreadydone', 'github-actions', 'jcommelin', 'jjaassoonn', 'kbuzzard', 'qawbecrdtey']	nobody	52-78903 1 month ago	52-79649 1 month ago	20-7596 20 days
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	52-71150 1 month ago	52-71150 1 month 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	52-34777 1 month ago	52-35904 1 month ago	0-1528 25 minutes
22314	shetzl author:shetzl	feat: add leftmost derivations for context-free grammars	Leftmost derivations are often easier to reason about than arbitrary derivations. This PR adds leftmost variants of Rewrites, Produces and Derives to the existing definition of context-free grammars and proves that a string of terminals can be derived iff it can be leftmost derived. Co-authored-by: Tobias Leichtfried --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	383/0	Mathlib.lean,Mathlib/Computability/LeftmostDerivation.lean	2	27	['github-actions', 'madvorak', 'shetzl']	nobody	51-62097 1 month ago	51-83366 1 month ago	51-83418 51 days
22330	jjdishere author:jjdishere	feat(RingTheory/Perfection): lemmas for `frobeniusEquiv.symm`	In this PR, we add several simp lemmas for `frobeniusEquiv.symm` and `frobeniusEquiv.symm^[n]`. We also modified `ModP` from a definition to an abbreviation to make the `Ideal.Quotient` APIs work on `ModP`. #21564 depends on this PR. --- - [ ] depends on: #22320 [![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$	321/5	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/Perfection.lean,Mathlib/RingTheory/Perfectoid/Untilt.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	51-59134 1 month ago	51-59136 1 month ago	0-822 13 minutes
22112	LeoDog896 author:LeoDog896	chore(AddCircle/Angle): norm_cast, simp	continues #22021 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		8/5	Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Topology/Instances/AddCircle.lean	2	1	['github-actions']	nobody	51-50450 1 month ago	58-9610 1 month ago	58-9595 58 days
21915	YaelDillies author:YaelDillies	feat: simproc for `Int.divisorsAntidiag`	Co-authored-by: Paul Lezeau --- - [x] depends on: #21912 - [x] depends on: #21991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta WIP	73/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/DivisorsAntidiag.lean	3	7	['YaelDillies', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	49-61837 1 month ago	49-61852 1 month ago	0-260 4 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	49-30832 1 month ago	49-30895 1 month 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	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	48-22794 1 month ago	48-24912 1 month 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	47-58299 1 month ago	49-79455 1 month ago	0-0 0 seconds
22390	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)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	112/1	Mathlib/CategoryTheory/Category/Factorisation.lean	1	9	['YunkaiZhang233', 'github-actions', 'joelriou']	nobody	46-75410 1 month ago	49-70882 1 month ago	0-6513 1 hour
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	46-74275 1 month ago	46-74275 1 month ago	0-0 0 seconds
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 awaiting-CI label:t-algebra$	100/122	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	2	['fpvandoorn', 'github-actions']	nobody	46-61117 1 month ago	46-61129 1 month ago	0-17 17 seconds
22320	jjdishere author:jjdishere	feat(RingTheory/WittVector): the Teichmuller series	In this PR, we show that every element `x` of the Witt vectors `𝕎 R` can be written as the (`p`-adic) summation of the Teichmuller series. Instead of using `tsum`, we only show that `p ^ (n + 1)` divides `x` minus the summation of the first `n + 1` terms of the Teichmuller series. We also show that if `p` divides the first (n + 1) coefficients of a Witt vector, then `p^(n+1)` divides the `n`-th ghost component. #21564 depends on this PR. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	204/2	Mathlib.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/FieldTheory/Perfect.lean,Mathlib/RingTheory/WittVector/Basic.lean,Mathlib/RingTheory/WittVector/Complete.lean,Mathlib/RingTheory/WittVector/TeichmullerSeries.lean	6	12	['github-actions', 'jjdishere', 'riccardobrasca']	nobody	45-68857 1 month ago	45-68857 1 month ago	6-3646 6 days
22539	joelriou author:joelriou	feat(Algebra/Homology): construction of left resolutions	Given a fully faithful functor `ι : C ⥤ A` to an abelian category, we introduce a structure `Abelian.LeftResolutions ι` which gives a functor `F : A ⥤ C` and a natural epimorphism `π.app X : ι.obj (F.obj X) ⟶ X` for all `X : A`. This is used in order to construct a resolution functor `LeftResolutions.chainComplexFunctor : A ⥤ ChainComplex C ℕ`. This shall be used in order to derive the tensor product of modules and sheaves of modules. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	271/19	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	4	1	['github-actions']	nobody	45-65943 1 month ago	45-78134 1 month ago	45-78119 45 days
22556	joelriou author:joelriou	feat(Algebra/Category/ModuleCat): a functorial projective resolution	--- - [ ] depends on: #22539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	315/19	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/LeftResolutions.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	45-62734 1 month ago	45-62736 1 month ago	0-516 8 minutes
22547	joelriou author:joelriou	feat(CategoryTheory/Abelian): construction of reduced left resolutions	The standard functorial free resolution of a `R`-module `M` 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. --- - [ ] depends on: #22539 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	498/19	Mathlib.lean,Mathlib/Algebra/Homology/HomologicalComplex.lean,Mathlib/Algebra/Homology/LeftResolutions/Basic.lean,Mathlib/Algebra/Homology/LeftResolutions/Reduced.lean,Mathlib/Algebra/Homology/LeftResolutions/Transport.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	45-62399 1 month ago	45-68423 1 month ago	0-358 5 minutes
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	45-57877 1 month ago	46-69576 1 month 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	45-46498 1 month ago	81-50275 2 months ago	17-17852 17 days
16000	YaelDillies author:YaelDillies	feat: Croot-Sisask Almost Periodicity	Almost periodicity is nowadays a standard tool in additive combinatorics. From LeanAPAP --- - [ ] depends on: #15443 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-combinatorics blocked-by-other-PR	0/0		0	4	['github-actions', 'leanprover-community-mathlib4-bot', 'mergify']	nobody	44-75819 1 month ago	44-75824 1 month ago	0-159 2 minutes
22586	joelriou author:joelriou	feat(CategoryTheory/Localization): the right derivability structure given by functorial resolutions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	152/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/OfFunctorialResolutions.lean,Mathlib/CategoryTheory/Localization/LocalizerMorphism.lean	3	1	['github-actions']	nobody	44-72577 1 month ago	44-78044 1 month ago	44-78029 44 days
22642	grunweg author:grunweg	WIP: add `mfderiv_prod` and `mfderiv_prodMap`	Help with these sorries is very welcome! Part of my bordism theory project: these will be needed for #22059. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry WIP	27/0	Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	1	1	['github-actions']	nobody	43-64651 1 month ago	43-64651 1 month ago	0-8 8 seconds
22652	101damnations author:101damnations	feat(RepresentationTheory/Coinvariants): the `G ⧸ S`-representation on `A_S` for `A : Rep k G`	Given a `G`-representation `A` and a normal subgroup `S ≤ G`, this PR defines the `G / S`-representation induced on `A_S`, the coinvariants of `ρ` restricted to `S`. It also defines the short exact sequence of `G`-representations `0 ⟶ I(S)A ⟶ A ⟶ A_S ⟶ 0` where `I(S)A` is the submodule of `A` generated by elements of the form `ρ(s)(a) - a` for `s : S, a : A`. --- - [ ] depends on: #22651 - [ ] depends on: #21732 - [ ] depends on: #21733 [![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$	612/15	Mathlib.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	43-48237 1 month ago	43-48239 1 month ago	0-635 10 minutes
22653	101damnations author:101damnations	feat(RepresentationTheory/GroupCohomology/Functoriality): the degree 1 part of the inflation-restriction exact sequence	Given a `G`-representation `A` and a normal subgroup `S` of `G`, this PR defines the short complex `H¹(G ⧸ S, A^S) ⟶ H¹(G, A) ⟶ H¹(S, A)` and proves it's exact, and that the left map is a monomorphism. --- - [ ] depends on: #22651 [![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$	279/11	Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	43-47665 1 month ago	43-48240 1 month ago	0-366 6 minutes
20230	joelriou author:joelriou	feat(CategoryTheory): categories of homological complexes are Grothendieck abelian	--- - [x] depends on: #19979 - [x] depends on: #20229 - [x] depends on: #20233 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	73/0	Mathlib.lean,Mathlib/Algebra/Homology/GrothendieckAbelian.lean	2	2	['callesonne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	43-37914 1 month ago	53-39636 1 month ago	53-39619 53 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	42-2257 1 month ago	43-57943 1 month ago	0-0 0 seconds
22724	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 from a complete lattice. --- - [ ] depends on: #21969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR	517/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	41-15941 1 month ago	41-15943 1 month ago	0-518 8 minutes
8167	sebzim4500 author:sebzim4500	feat: Add new `grw` tactic for rewriting using inequalities.	feat: Add new `grw` tactic for rewriting using inequalities. Co-authored-by: @hrmacbeth, @digama0 --- - [x] depends on: #8796 ```lean example (x y z w : ℝ) (h₁ : x < z) (h₂ : w ≤ y + 4) (h₃ : Real.exp z < 5 * w) : Real.exp x < 5 * (y + 4) := by grw [h₁, ← h₂] exact h₃ ``` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta modifies-tactic-syntax	552/2	Mathlib.lean,Mathlib/Data/Int/ModEq.lean,Mathlib/Tactic.lean,Mathlib/Tactic/GCongr/Core.lean,Mathlib/Tactic/GRW.lean,Mathlib/Tactic/GRW/Core.lean,Mathlib/Tactic/GRW/Lemmas.lean,MathlibTest/GRW.lean,scripts/noshake.json	9	53	['Vierkantor', 'digama0', 'eric-wieser', 'fpvandoorn', 'github-actions', 'hrmacbeth', 'kim-em', 'leanprover-community-mathlib4-bot', 'sebzim4500']	nobody	40-61281 1 month ago	41-48250 1 month ago	72-10501 72 days
22739	joelriou author:joelriou	feat(CategoryTheory/Abelian): isomorphisms modulo a Serre class	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	176/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean	4	5	['TwoFX', 'github-actions', 'joelriou']	nobody	40-40961 1 month ago	40-40961 1 month ago	40-57207 40 days
22404	joelriou author:joelriou	feat(Algebra/Homology): connecting a chain complex and a cochain complex	Given a chain complex `K`: `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0`, a cochain complex `L`: `L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, a morphism `d₀: K.X 0 ⟶ L.X 0` satisfying the identifies `K.d 1 0 ≫ d₀ = 0` and `d₀ ≫ L.d 0 1 = 0`, we construct a cochain complex indexed by `ℤ` of the form `... ⟶ K.X 2 ⟶ K.X 1 ⟶ K.X 0 ⟶ L.X 0 ⟶ L.X 1 ⟶ L.X 2 ⟶ ...`, where `K.X 0` lies in degree `-1` and `K.X 0` in degree `0`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	116/0	Mathlib.lean,Mathlib/Algebra/Homology/Embedding/Connect.lean	2	2	['callesonne', 'github-actions']	nobody	40-35042 1 month ago	49-60595 1 month ago	49-60580 49 days
9353	mans0954 author:mans0954	refactor(LinearAlgebra/Matrix/SesquilinearForm): Sesquilinear Maps and Scalar Matrices	WIP PR to generalise from forms to maps the results not covered in #9334 --- - [x] depends on: #9312 - [x] depends on: #9334 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	87/11	Mathlib.lean,Mathlib/LinearAlgebra/Matrix/ScalarMatrix.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean	3	n/a	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	40-25383 1 month ago	unknown	unknown
22741	joelriou author:joelriou	feat(CategoryTheory/Abelian/SerreClass): left Bousfield localizations	If `G : D ⥤ C` is an exact functor between abelian categories, with a fully faithful right adjoint `F`, then `G` identifies `C` to the localization of `D` with respect to the class of morphisms `G.kernel.isoModSerre`, i.e. `D` is the localization of `C` with respect to Serre class `G.kernel` consisting of the objects in `D` that are sent to a zero object by `G`. (We also translate this in terms of a left Bousfield localization.) --- - [ ] depends on: #22739 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	263/0	Mathlib.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Bousfield.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	39-83984 1 month ago	40-54617 1 month ago	0-1246 20 minutes
22628	scholzhannah author:scholzhannah	feat: finiteness notions on CW complexes	This PR defines three finiteness notions on (classical) CW complexes: finite dimensionality, finite type, and finiteness. A CW complex is finite dimensional if the indexing type of cells is empty in all but finitely many dimensions. It is of finite type if the indexing type of cells is finite in every dimension. Lastly, a CW complex is finite if it is both finite dimensional and of finite type. The PR also provides constructors for CW complexes that are of finite type or finite and proves that a CW complex is finite iff the total number of cells is finite. Co-authored-by: Floris van Doorn --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	375/0	Mathlib.lean,Mathlib/Topology/CWComplex/Classical/Finite.lean	2	5	['github-actions', 'grunweg', 'scholzhannah']	nobody	39-66710 1 month ago	43-76009 1 month ago	43-76061 43 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-topology WIP	91/24	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/VanKampen.lean	2	0	[]	nobody	39-60961 1 month ago	446-46344 1 year ago	0-0 0 seconds
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 WIP	134/10	Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	1	1	['github-actions']	nobody	39-56861 1 month ago	41-44928 1 month ago	0-6 6 seconds
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 and undocumented scripts when linting Mathlib 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). --- (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 awaiting-author	34/10	scripts/lint-style.lean	1	12	['adomani', 'github-actions', 'grunweg', 'joneugster']	joneugster assignee:joneugster	39-49980 1 month ago	53-46253 1 month ago	19-1483 19 days
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	39-42330 1 month ago	39-65074 1 month ago	0-0 0 seconds
22820	chrisflav author:chrisflav	chore: fix `Scheme.Hom.appTop`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	67/35	Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Restrict.lean,Mathlib/AlgebraicGeometry/Scheme.lean	4	1	['github-actions']	nobody	38-84340 1 month ago	38-84342 1 month ago	0-0 0 seconds
21129	chrisflav author:chrisflav	perf(RingTheory/Kaehler/JacobiZariski): reorder universe variables	Naming of universe variables has an impact on universe unification. It seems to matter that the universe variables of `R`, `S` and `T` appear before the universe variables of the generators in alphabetical order. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	performance-hack t-algebra label:t-algebra$	18/20	Mathlib/RingTheory/Kaehler/JacobiZariski.lean	1	37	['chrisflav', 'erdOne', 'github-actions', 'grunweg', 'kbuzzard', 'leanprover-bot', 'mattrobball']	nobody	38-79214 1 month ago	72-81675 2 months ago	81-62982 81 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 WIP	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	38-78396 1 month ago	39-42635 1 month 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	38-46838 1 month ago	38-48778 1 month ago	0-0 0 seconds
22856	mattrobball author:mattrobball	test			8/2	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/RCLike/Inner.lean,Mathlib/FieldTheory/Galois/Profinite.lean	4	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	38-34827 1 month ago	38-36700 1 month ago	0-0 0 seconds
22782	alreadydone author:alreadydone	WIP: etale space associated to a presheaf	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	349/170	Mathlib.lean,Mathlib/CategoryTheory/Category/Pairwise.lean,Mathlib/Topology/EtaleSpace.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/PresheafOfFunctions.lean,Mathlib/Topology/Sheaves/SheafCondition/OpensLeCover.lean,Mathlib/Topology/Sheaves/SheafCondition/PairwiseIntersections.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean,Mathlib/Topology/Sheaves/SheafOfFunctions.lean,Mathlib/Topology/Sheaves/Sheafify.lean,Mathlib/Topology/Sheaves/Stalks.lean	11	1	['github-actions']	nobody	37-79986 1 month ago	39-64851 1 month ago	0-687 11 minutes
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. --- - [ ] depends on: #22739 - [ ] depends on: #22741 - [x] depends on: #22733 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	376/4	Mathlib.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/ModuleEmbedding/GabrielPopescu.lean,Mathlib/CategoryTheory/Abelian/SerreClass/Bousfield.lean,Mathlib/CategoryTheory/Abelian/SerreClass/MorphismProperty.lean,Mathlib/CategoryTheory/Limits/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Limits/Shapes/Kernels.lean,Mathlib/CategoryTheory/ObjectProperty/ContainsZero.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	37-43257 1 month ago	37-43272 1 month ago	0-2391 39 minutes
22531	vasnesterov author:vasnesterov	feat(Analysis): radius of convergence for `FormalMultilinearSeries.compContinuousLinearMap`	- Add basic lemmas `compContinuousLinearMap_id` and `compContinuousLinearMap_comp`. - Prove lower and upper bounds for the convergence radius of `f.compContinuousLinearMap`. - Prove `radius_compNeg`: the convergence radii of `f(x)` and `f(-x)` are equal. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	115/6	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,scripts/noshake.json	3	1	['github-actions']	nobody	36-85294 1 month ago	36-85311 1 month ago	45-38826 45 days
22767	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory): the augmented simplex category	This PR defines `AugmentedSimplexCategory` as `WithInitial SimplexCategory`. Using the API in `CategoryTheory.WithTerminal`, we check that functors out of this category (resp. out of its opposite) corresponds to cosimplicial (resp. simplicial) objects, and we link various construction about simplicial objects in terms of this category. --- - [x] depends on : #22658 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	119/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented.lean	2	3	['github-actions', 'robin-carlier']	nobody	36-76441 1 month ago	36-76462 1 month ago	39-72147 39 days
22768	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/Augmented): monoidal structure on `AugmentedSimplexCategory`	We construct a monoidal category structure on `AugmentedSimplexCategory`. The tensor products corresponds to ordinal sum. We characterize morphisms out of a tensor product of object in terms of their precomposition with canonical maps `x ⟶ x ⊗ y` and `y ⟶ x ⊗ y` coming from the fact that the unit is an initial object. Finally, we show that `⦋0⦌` admits a canonical internal monoid object structure. --- - [ ] depends on: #22767 I hope to be able to clear the TODO in `AlgebreaicTopology.SimplexCategory.Augmented.Mon_` in future work, as this should be the "right" statement for the monoidal bar construction, but there is still a long way to go. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	581/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Mon_.lean,Mathlib/AlgebraicTopology/SimplexCategory/Augmented/Monoidal.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-76417 1 month ago	36-76434 1 month ago	0-33 33 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 awaiting-author	27/39	Mathlib/Tactic/Recall.lean	1	1	['github-actions']	nobody	36-60174 1 month ago	36-60213 1 month ago	0-0 0 seconds
16074	Rida-Hamadani author:Rida-Hamadani	feat: combinatorial maps and planar graphs	--- - [x] depends on: #16011 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics awaiting-author	222/0	Mathlib.lean,Mathlib/Combinatorics/CombinatorialMap.lean,Mathlib/Combinatorics/SimpleGraph/Planar.lean	3	24	['Parcly-Taxel', 'Rida-Hamadani', 'github-actions', 'lambda-fairy', 'leanprover-community-mathlib4-bot']	nobody	36-29608 1 month ago	69-46722 2 months ago	3-73856 3 days
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	52/14	Mathlib/CategoryTheory/Limits/Shapes/BinaryBiproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/Biproducts.lean,Mathlib/CategoryTheory/Limits/Shapes/ZeroMorphisms.lean	3	1	['github-actions']	nobody	35-66469 1 month ago	35-66650 1 month ago	35-66696 35 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 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	1	['github-actions']	nobody	34-71780 1 month ago	34-71780 1 month ago	0-0 0 seconds
22948	pelicanhere author:pelicanhere	feat(Algebra/DirectSum): morphism of directsum decomposition	Define morphism of directsum decomposition, which would be later used in defineing graded ring hom. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	68/0	Mathlib/Algebra/DirectSum/Decomposition.lean	1	1	['github-actions']	nobody	34-68808 1 month ago	34-81452 1 month ago	34-81498 34 days
21760	101damnations author:101damnations	feat(RepresentationTheory/GroupCohomology/LongExactSequence): specialise LES API to group cohomology	Given a commutative ring `k` and a group `G`, this PR shows that a short exact sequence of `k`-linear `G`-representations `0 ⟶ X₁ ⟶ X₂ ⟶ X₃ ⟶ 0` induces a short exact sequence of complexes of inhomogeneous cochains `0 ⟶ C(X₁) ⟶ C(X₂) ⟶ C(X₃) ⟶ 0`, where `Hⁿ(C(Xᵢ))` is the `n`th group cohomology of `Xᵢ`. This allows us to specialize API about long exact sequences to group cohomology. --- - [x] depends on: #21652 - [x] depends on: #21739 - [x] depends on: #21756 - [x] depends on: #21758 [![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$	179/6	Mathlib.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RepresentationTheory/GroupCohomology/LongExactSequence.lean	7	4	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	34-65834 1 month ago	34-65834 1 month ago	15-42431 15 days
22196	xyzw12345 author:xyzw12345	feat: `lie_ring` tactic and `LieReduce` command	In this PR, we implement a new tactic that reduces expressions in a `LieRing` to a normal form and checks whether they are equal, and a command which reduces the expression and displays the normal form. The implementation of this tactic imitates the `ring` tactic, using the `Qq` package to implement a specific reduction algorithm, following the theory of Hall sets and Lyndon words. A reference for the algorithm can be found at, for example, [here](https://personal.math.ubc.ca/~cass/research/pdf/Free.pdf). This project is the result of a workshop at Peking University, and @siddhartha-gadgil has helped us a lot on understanding the concepts in metaprogramming. Edit: The changes are reverted to a point where only `AtomM` is used. Co-authored-by: @Thmoas-Guan <2300010733@stu.pku.edu.cn> @yhtq <2100012990@stu.pku.edu.cn> @Blackfeather007 <2100017455@stu.pku.edu.cn> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	821/0	Mathlib.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	7	5	['github-actions', 'ocfnash', 'siddhartha-gadgil', 'xyzw12345']	nobody	34-62343 1 month ago	55-18727 1 month ago	55-18722 55 days
22962	YaelDillies author:YaelDillies	feat: torsion-free monoids	Behind this click-baity title, there is the fact that `Monoid.IsTorsionFree` is incorrect for torsion-free monoids. Indeed, if `n ≠ 0` then `∀ a : α, n • a = 0 → a = 0` is equivalent to `∀ a b : α, n • a = n • b → a = b` only if `α` is a group. If `α` is a monoid (possibly even cancellative!), then the `∀ a : α, n • a = 0 → a = 0` condition is quite weak. This PR introduces this new definition under the names `IsAddTorsionFree`/`IsMulTorsionFree`. Several things to note: * It is a class, while `Monoid.IsTorsionFree` is not. * It is outside of the `Monoid`/`AddMonoid` namespace. My thought is that people who care about torsion-free groups will prefer writing `IsAddTorsionFree G` over `Monoid.IsTorsionFree`. * I am making a new file. This is because the existing definitions talk about order of an element, which is a much more advanced notion than the new one I am offering. * I am not changing the existing definition in this PR. This will be done in a later PR. From Toric Co-authored-by: Patrick Luo --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-algebra label:t-algebra$	83/33	Mathlib.lean,Mathlib/Algebra/Group/Torsion.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/NumberTheory/Padics/MahlerBasis.lean,Mathlib/RingTheory/Binomial.lean	6	1	['github-actions']	nobody	34-29111 1 month ago	34-29111 1 month ago	34-58721 34 days
22954	eric-wieser author:eric-wieser	feat(RingTheory/Congruence/Hom): copy from GroupTheory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	194/9	Mathlib/Algebra/RingQuot.lean,Mathlib/RingTheory/Congruence/Defs.lean,Mathlib/RingTheory/Congruence/Hom.lean	3	1	['github-actions']	nobody	33-57790 1 month ago	34-70072 1 month ago	34-70119 34 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	32-82324 1 month ago	32-82324 1 month ago	20-81771 20 days
22828	joelriou author:joelriou	feat(CategoryTheory): parametrized adjunctions	Given bifunctors `F : C₁ ⥤ C₂ ⥤ C₃` and `G : C₁ᵒᵖ ⥤ C₃ ⥤ C₂`, this PR introduces adjunctions with a parameter `F ⊣₂ G`. In the case of closed monoidal categories, we obtain `curriedTensor C ⊣₂ internalHom`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	127/0	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Parametrized.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean	3	4	['emilyriehl', 'github-actions', 'joelriou', 'mckoen']	nobody	32-77689 1 month ago	36-37951 1 month ago	38-61758 38 days
22834	joelriou author:joelriou	feat(CategoryTheory): lifting properties and adjunctions of bifunctors	Given a parametrized adjunction `adj₂ : F ⊣₂ G` between bifunctors `F : C₁ ⥤ C₂ ⥤ C₃` and `G : C₁ᵒᵖ ⥤ C₃ ⥤ C₂`, three maps `f₁ : X₁ ⟶ Y₁` in `C₁`, `f₂ : X₂ ⟶ Y₂` in `C₂`, and `f₃ : X₃ ⟶ Y₃` in `C₃`, this PR shows that `f₃` has the right lifting property with respect to the "inclusion" of the pushout of `(F.obj Y₁).obj X₂` and `(F.obj X₁).obj Y₂` along `(F.obj X₁).obj X₂` into `(F.obj Y₁).obj Y₂` if and only if `f₂` has the left lifting property with respect to the projection map from `(G.obj Y₁).obj X₃` to the pullback of `(G.obj (op X₁)).obj X₃` and `(G.obj (op Y₁)).obj Y₃` over `(G.obj (op X₁)).obj Y₃`. (In homotopical algebra, this is typically used for the adjunction between the tensor product and the internal hom.) --- - [ ] depends on: #22828 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	415/0	Mathlib.lean,Mathlib/CategoryTheory/Adjunction/Parametrized.lean,Mathlib/CategoryTheory/Closed/Monoidal.lean,Mathlib/CategoryTheory/LiftingProperties/Basic.lean,Mathlib/CategoryTheory/LiftingProperties/ParametrizedAdjunction.lean	5	6	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	32-77584 1 month ago	38-62713 1 month ago	0-9 9 seconds
22794	vasnesterov author:vasnesterov	feat(Tactic/NormNum): `norm_num` extension for `Irrational x^y`	Add `norm_num` extension for `Irrational x^y`. --- I don't disprove `Irrational x^y` when `x^y` is, in fact, rational here, because I hope in the future `norm_num` will be able to simplify such expressions to their rational representations (e.g. `(8/27)^(2/3) --> 4/9`), and then apply `Rat.not_irrational`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	446/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Irrational.lean,MathlibTest/norm_num_ext.lean,scripts/noshake.json	5	1	['github-actions']	nobody	32-62248 1 month ago	34-30985 1 month ago	39-31525 39 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/)	t-computability new-contributor awaiting-author	114/0	Mathlib/Computability/DFA.lean,Mathlib/Computability/Language.lean	2	56	['EtienneC30', 'YaelDillies', 'github-actions', 'maemre', 'urkud']	EtienneC30 assignee:EtienneC30	32-59630 1 month ago	32-59630 1 month ago	48-67492 48 days
8047	faenuccio author:faenuccio	refactor(Util/Delaborators): remove `scoped` from delabPi'	Following [this discussion](https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Notation.20for.20Pi.20type) on Zulip, remove `scoped` from the delaborator of `Pi` so that in the infoview the `Pi` symbol appears again.	awaiting-zulip t-meta	1/1	Mathlib/Util/Delaborators.lean	1	3	['eric-wieser', 'github-actions', 'joneugster']	nobody	32-58965 1 month ago	32-58965 1 month ago	503-61537 503 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	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	1	['github-actions']	nobody	32-50804 1 month ago	32-51626 1 month ago	32-51802 32 days
21732	101damnations author:101damnations	feat(RepresentationTheory/*): representations on `Finsupp`	Given a type `α` and a representation `A`, this PR defines `Rep.finsupp`, the representation defined pointwise on `α →₀ A`, and specializes this to `Rep.free`, when `A = leftRegular k G`. We define `Rep.freeLiftLEquiv α A`, the `k`-linear equivalence between functions `α → A` and representation morphisms `Rep.free k G α ⟶ A`. We also define representation isomorphisms `(α →₀ A) ⊗ B ≅ (A ⊗ B) →₀ α ≅ A ⊗ (α →₀ B)` given representations `A` and `B`, and finally `k[G] ⊗ (α →₀ k) ≅ free k G α` where `α →₀ k` is equipped with the trivial representation. --- - [x] depends on: #21652 - [x] depends on: #22335 - [x] depends on: #22338 - [ ] depends on: #23021 [![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$	193/15	Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Rep.lean	4	8	['101damnations', 'Whysoserioushah', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-40123 1 month ago	32-40125 1 month ago	8-65437 8 days
20071	vasnesterov author:vasnesterov	refactor(Data/Seq): reorganize `Seq.lean`	The `Seq` API in the `Seq.lean` file was somewhat disorganized. This PR reorganizes the file to make it more structured. It arranges the API in the following way: 1. Definitions and the `get?` function. 2. Constructors: `nil` and `cons`. 3. Destructors: `head`, `tail`, and `destruct`. 4. Recursion and corecursion principles. 5. Bisimulation. 6. `Terminates` API. 7. `Membership` for sequences. 8. Conversion to and from other types (`List`, `Stream`, `MLList`) and `take` operation as it is required for conversion to `List`. 9. Definitions of other operations on sequences (`append`, `map`, `join`, etc.). 10. Lemmas about conversions and operations, organized into sections by the primary operation of each lemma. --- I tried not to change any proofs here, but had to rewrite some of them due to dependencies and to avoid importing `apply_fun`. The proofs of the following lemmas were changed: * `head_eq_some` * `head_eq_none` * `cons_ne_nil` * `cons_eq_cons` * `ofList` I found it useful to run `git diff --color-moved` to verify that the actual difference is just these proofs and adding sections. - [x] depends on: #19859 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	501/441	Mathlib/Data/Seq/Seq.lean,scripts/noshake.json	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-399 1 month ago	32-414 1 month ago	39-33853 39 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	31-80436 1 month ago	31-80591 1 month ago	0-1 1 second
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	151/0	.github/workflows/PR_summary_lean.yml,scripts/README.md,scripts/declarations_diff.lean,scripts/declarations_diff_lean_shell_glue.sh	4	3	['bryangingechen', 'github-actions']	nobody	31-70134 1 month ago	45-54538 1 month ago	45-54531 45 days
23048	scholzhannah author:scholzhannah	feat: PartialEquiv on closed sets restricts to closed map	This PR shows that a PartialEquiv that is continuous on both source and target restricts to a homeomorphism. It then uses that to show that a PartialEquiv with closed source and target and which is continuous on both the source and target restricts to a closed map. --- I need the latter statement to prove that one can transport a CW complex along a PartialEquiv. I had trouble finding a good spot for these statements; I hope this solution works. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	53/0	Mathlib.lean,Mathlib/Topology/PartialEquiv.lean	2	1	['github-actions']	nobody	31-65479 1 month ago	31-65479 1 month ago	31-65533 31 days
17587	kmill author:kmill	feat: Sym2-as-Finset theory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	31-6449 1 month ago	31-41929 1 month ago	0-0 0 seconds
22824	alreadydone author:alreadydone	chore: generalize universes for (pre)sheaves of types	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	164/132	Mathlib/CategoryTheory/Category/Pairwise.lean,Mathlib/Topology/Sheaves/LocalPredicate.lean,Mathlib/Topology/Sheaves/PresheafOfFunctions.lean,Mathlib/Topology/Sheaves/SheafCondition/OpensLeCover.lean,Mathlib/Topology/Sheaves/SheafCondition/PairwiseIntersections.lean,Mathlib/Topology/Sheaves/SheafCondition/UniqueGluing.lean,Mathlib/Topology/Sheaves/SheafOfFunctions.lean	7	6	['alreadydone', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	30-84342 30 days ago	30-84342 30 days ago	34-38444 34 days
22971	mbkybky author:mbkybky	refactor(FieldTheory/KrullTopology): clean up `KrullTopology.lean`	Clean up `KrullTopology.lean` by moving some lemmas to their appropriate locations in earlier files. Also move some lemmas from `IntermediateField/Adjoin/Defs.lean` to `IntermediateField/Basic.lean` since they are used in the proofs of new theorems in `IntermediateField/Algebraic.lean`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	130/126	Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/FieldTheory/IntermediateField/Algebraic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/FieldTheory/SeparableDegree.lean	7	11	['Thmoas-Guan', 'github-actions', 'tb65536', 'yhtq']	nobody	30-52623 30 days ago	31-67502 1 month ago	32-79298 32 days
22771	alreadydone author:alreadydone	feat(Homotopy/Lifting): monodromy of a covering map and lifting criterion	Definition 2.1 in https://ncatlab.org/nlab/show/monodromy. Also: + Extract `FundamentalGroupoid.map (f : C(X, Y)) : FundamentalGroupoid X ⥤ FundamentalGroupoid Y` from `fundamentalGroupoidFunctor : TopCat ⥤ CategoryTheory.Grpd` + Define `FundamentalGroup.map (f : C(X, Y)) (x : X) : FundamentalGroup X x →* FundamentalGroup Y (f x)` and `mapOfEq : FundamentalGroup X x →* FundamentalGroup Y y` that takes an assumption `f x = y`. + Redefine `FundamentalGroup` to be `End` rather than `Aut`: since `FundamentalGroupoid` is a groupoid, `End` already has a group structure. + Golf within the file FundamentalGroupoid/Basic. + Generalize `toArrow` up to `fromPath` in `FundamentalGroupoid/FundamentalGroup` from `X : TopCat` to `[TopologicalSpace X]`. Also golfs some proofs and redefines --- - [x] depends on: #22649 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	193/147	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	30-12490 30 days ago	30-79006 30 days ago	30-80905 30 days
18091	tukamilano author:tukamilano	feat: Hoeffding's lemma	Formalize Hoeffding's lemma using the property of cumulant. Co-authored-by: Yuma Mizuno [mizuno.y.aj@gmail.com](mailto:mizuno.y.aj@gmail.com) --- - [x] depends on: #20151	large-import new-contributor t-measure-probability awaiting-author	339/0	Mathlib.lean,Mathlib/Probability/Hoeffding.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/Probability/Moments/MGFAnalytic.lean,docs/references.bib	5	55	['RemyDegenne', 'YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'tukamilano', 'yuma-mizuno']	tukamilano assignee:tukamilano	29-73940 29 days ago	29-73948 29 days ago	1-58489 1 day
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 awaiting-author	376/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/Orientable.lean	3	39	['Rida-Hamadani', 'github-actions', 'grunweg', 'ocfnash']	nobody	29-29096 29 days ago	48-67818 1 month ago	5-70530 5 days
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	28-83582 28 days ago	28-83582 28 days ago	0-68906 19 hours
23111	pechersky author:pechersky	feat(Topology/MetricSpace): pseudometrics as bundled functions	Preparation for results using families of pseudometrics --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	211/0	Mathlib.lean,Mathlib/Topology/MetricSpace/BundledFun.lean	2	35	['YaelDillies', 'github-actions', 'pechersky', 'plp127']	nobody	28-68073 28 days ago	28-69235 28 days ago	30-21786 30 days
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 label:t-algebra$	5/3	Mathlib/RingTheory/Derivation/Basic.lean	1	6	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	27-71042 27 days ago	27-74660 27 days ago	27-74710 27 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 label:t-algebra$	6/0	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	27-64011 27 days ago	27-67556 27 days ago	27-67602 27 days
23004	Vierkantor author:Vierkantor	Benchmarking for #22950	This is a rebase of #22950 on top of the changes of #22907 so we can see the true difference in benchmarking. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data WIP	10/6	Mathlib/Data/Complex/Exponential.lean,Mathlib/Data/PFun.lean	2	10	['Vierkantor', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	27-34558 27 days ago	27-34558 27 days ago	0-0 0 seconds
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 label:t-algebra$	6/10	Mathlib/Algebra/Module/LinearMap/Defs.lean	1	9	['eric-wieser', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	27-26237 27 days ago	27-42730 27 days ago	27-42780 27 days
22457	Komyyy author:Komyyy	feat(Mathlib/Computability/Ackermann): Ackermann function is computable	It had been proved that Ackermann function is not primitive recursive, but not been proved that it's computable. I proved that. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability	51/1	Mathlib/Computability/Ackermann.lean	1	11	['Komyyy', 'github-actions', 'vihdzp']	nobody	27-23032 27 days ago	46-31826 1 month ago	47-60599 47 days
11563	YaelDillies author:YaelDillies	feat: `∑ i ∈ s with hi : p i, f i hi` syntax for big operators	Define new notation for `Finset.sum`/`Finset.prod`. `∑ i ∈ s with hi : p i, f i hi` now is notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).2`. --- - [x] depends on: #6795 Other notations we could have are * `∑ hi : i ∈ s, f i hi` as notation for `∑ i : s, f i.1 i.2` * `∑ hi : i ∈ s with p i, f i hi` as notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).1` * `∑ hi : i ∈ s with hpi : p i, f i hi hpi` as notation for `∑ i : s.filter p, f i.1 (mem_filter.1 i.2).1 (mem_filter.1 i.2).2` but Eric seems mildly unhappy about them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-meta label:t-algebra$	27/18	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean	1	27	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'kbuzzard', 'kmill', 'leanprover-community-mathlib4-bot']	nobody	26-46325 26 days ago	26-46342 26 days ago	74-66035 74 days
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	61/4	Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Operations.lean,Mathlib/MeasureTheory/Covering/Besicovitch.lean	3	4	['YaelDillies', 'b-mehta', 'github-actions']	nobody	26-46164 26 days ago	26-46185 26 days ago	2-24624 2 days
22048	YaelDillies author:YaelDillies	feat: delaborator for `∑ x ∈ s with p x, f x` notation	Co-authored-by: Kyle Miller --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	142/21	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,MathlibTest/BigOps.lean	2	20	['YaelDillies', 'b-mehta', 'github-actions', 'kmill']	nobody	26-44901 26 days ago	26-44916 26 days ago	57-2345 57 days
23240	urkud author:urkud	feat(Topology/Maps): `IsOpenMap` and `ClusterPt`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology delegated	17/4	Mathlib/Topology/Maps/Basic.lean	1	6	['eric-wieser', 'github-actions', 'grunweg', 'mathlib-bors', 'urkud']	nobody	26-26311 26 days ago	26-33390 26 days ago	0-12104 3 hours
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/)	blocked-by-other-PR WIP	156/0	Mathlib.lean,Mathlib/Data/Sum/Decompose.lean,Mathlib/LinearAlgebra/Matrix/Determinant/TotallyUnimodular.lean	3	10	['github-actions', 'jcommelin', 'madvorak', 'mathlib4-dependent-issues-bot']	nobody	25-55657 25 days ago	25-55657 25 days ago	0-0 0 seconds
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	25-33973 25 days ago	25-33979 25 days ago	0-24 24 seconds
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	311/9	Mathlib/Data/Bundle.lean,Mathlib/Geometry/Manifold/VectorBundle/Basic.lean,Mathlib/Geometry/Manifold/VectorBundle/Pullback.lean,Mathlib/Topology/FiberBundle/Constructions.lean	4	10	['github-actions', 'hrmacbeth', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	24-64567 24 days ago	29-74153 29 days ago	30-58613 30 days
8738	grunweg author:grunweg	feat: differential of a local diffeomorphism is a continuous linear equivalence	With the `localInverse` definition, this is a straightforward argument using the chain rule. ------ - [x] depends on: #23219 (the `localInverse` API) - [x] depends on: #8736 Unclear/open question: is there a better solution than these helper lemmas? The current approach feels unelegant. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	92/10	Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean	2	20	['ADedecker', 'alreadydone', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel', 'winstonyin']	nobody	24-63980 24 days ago	24-63983 24 days ago	60-3974 60 days
22069	Raph-DG author:Raph-DG	feat(LinearMap): Added lemmas relating kernels of linear maps to Submodule.map	Added the lemma ne_map_or_ne_kernel_inter_of_lt stating that if A < B as submodules, then for any linear map f, `ker f ⊓ A ≠ ker f ⊓ B ∨ Submodule.map f A ≠ Submodule.map f B`. We also prove the corollaries ker_inter_mono_of_map_eq and map_mono_of_ker_inter_eq. Co-authored-by: Raphael Douglas Giles (raphaeldouglasgiles@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	28/0	Mathlib/LinearAlgebra/Span/Basic.lean	1	14	['Paul-Lez', 'Raph-DG', 'github-actions', 'j-loreaux']	nobody	24-61383 24 days ago	24-61400 24 days ago	58-46501 58 days
23205	xroblot author:xroblot	feat(QuotientGroup): surjectivity and kernel of `QuotientGroup.map`	Prove formulas for the kernel of `QuotientGroup.lift` and `QuotientGroup.map` and that these maps are surjective if the corresponding functions are surjective. --- - [x] depends on: #23269 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	26/0	Mathlib/GroupTheory/QuotientGroup/Defs.lean	1	12	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'xroblot']	nobody	24-1340 24 days ago	24-38973 24 days ago	27-40630 27 days
22488	smmercuri author:smmercuri	fix: lower priority for `UniformSpace.Completion.instSMul`	Following the introduction of the `WithVal` type synonym in #22055 the following instance takes a long time to synthesise in FLT, and times out in the default heartbeats ```lean import Mathlib namespace IsDedekindDomain.HeightOneSpectrum variable (A K : Type*) [CommRing A] [Field K] [Algebra A K] [IsFractionRing A K] [IsDedekindDomain A] (v : HeightOneSpectrum A) #synth SMul (v.adicCompletionIntegers K) (v.adicCompletion K) ``` The issue is that `UniformSpace.Completion.instSMul (v.adicCompletionIntegers K) (v.adicCompletion K)` now fires during the start of instance search (because we now have `UniformSpace (WithVal (v.valuation K))` whereas previously this would be `UniformSpace K`, which was not automatic), and this takes a long time to fail (leading to ~1400 entries in the trace). The first few lines of the new trace is ```lean [Meta.synthInstance] [5.512418] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000118] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000537] ✅️ apply UniformSpace.Completion.instSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.004411] ✅️ apply @WithVal.instSMul to SMul (↥(adicCompletionIntegers K v)) (WithVal (valuation K v)) ▶ [] [0.000765] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) K ▶ [] [0.000378] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) K ▶ ... [] 1339 more entries... ▶ ``` Lowering the priority of `UniformSpace.Completion.instSMul` fixes this particular issue, leading to a trace that matches that seen prior to the introduction of `WithVal`: ```lean [Meta.synthInstance] [0.016405] ✅️ SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▼ [] [0.000119] new goal SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000491] ❌️ apply @GradedMonoid.GradeZero.smul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000403] ✅️ apply @Algebra.toSMul to SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000134] ❌️ apply inst✝⁴ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000093] ❌️ apply inst✝⁵ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000077] ❌️ apply inst✝⁷ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000082] ❌️ apply inst✝⁹ to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000075] ❌️ apply inst✝¹² to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.000220] ❌️ apply Algebra.id to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [] [0.001015] ✅️ apply @ValuationSubring.instAlgebraSubtypeMem to Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [resume] [0.000038] propagating Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) to subgoal Algebra (↥(adicCompletionIntegers K v)) (adicCompletion K v) of SMul (↥(adicCompletionIntegers K v)) (adicCompletion K v) ▶ [check] [0.013358] ✅️ Algebra.toSMul [] result Algebra.toSMul ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-topology	1/1	Mathlib/Topology/Algebra/UniformMulAction.lean	1	7	['github-actions', 'leanprover-bot', 'smmercuri', 'urkud']	nobody	23-44756 23 days ago	46-83736 1 month ago	46-83780 46 days
22884	tannerduve author:tannerduve	feat(Computability/TuringDegrees): define oracle computability and Turing degrees	### Description Define a model of oracle computability, introducing Turing reducibility (`≤ᵀ`), Turing equivalence (`≡ᵀ`), and Turing degrees as the quotient under Turing equivalence. - `RecursiveIn O f`: A function `f` is recursive in a set of oracles `O` if it can be computed using `O` via basic operations (zero, successor, pairing, composition, primitive recursion, and μ-recursion). - `TuringReducible`: The relation that `f` is recursive in `{g}`, i.e., `f ≤ᵀ g`. - `TuringEquivalent`: A relation defining Turing equivalence between partial functions. - `TuringDegree`: The set of equivalence classes under `TuringEquivalent`, forming a partially ordered structure. Additionally: - Prove that `TuringReducible` is a preorder (reflexive, transitive). - Show that `TuringEquivalent` is an equivalence relation. - Establish that partial recursive functions correspond to functions recursive in the empty oracle set. This formalization follows classical recursion theory (Odifreddi, Soare) and extends previous work by Carneiro. ### Breaking Changes None. ### Dependencies None.	t-computability new-contributor	221/0	Mathlib.lean,Mathlib/Computability/TuringDegrees.lean	2	8	['github-actions', 'tannerduve', 'tristan-f-r']	nobody	23-35526 23 days ago	37-52008 1 month ago	37-52055 37 days
23336	kim-em author:kim-em	chore: `erw` in `Topology/Order/`		t-topology	6/7	Mathlib/Topology/Order/LawsonTopology.lean,Mathlib/Topology/Order/LowerUpperTopology.lean,Mathlib/Topology/Order/ScottTopology.lean,Mathlib/Topology/Order/UpperLowerSetTopology.lean	4	4	['github-actions', 'kim-em', 'urkud']	nobody	23-32575 23 days ago	23-71727 23 days ago	23-71775 23 days
23284	kbuzzard author:kbuzzard	feat(Algebra/BigOperators/Finprod): add finprod_mem_eq_prod variant	Add `finprod_mem_eq_prod'` (and docstrings explaining the prime). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	18/1	Mathlib/Algebra/BigOperators/Finprod.lean	1	4	['Ruben-VandeVelde', 'github-actions', 'kbuzzard']	nobody	23-29593 23 days ago	23-29593 23 days ago	2-6550 2 days
22655	YaelDillies author:YaelDillies	refactor: make use of `FunLike` for `Submonoid.LocalizationMap`	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	156/140	Mathlib/GroupTheory/MonoidLocalization/Away.lean,Mathlib/GroupTheory/MonoidLocalization/Basic.lean,Mathlib/GroupTheory/MonoidLocalization/MonoidWithZero.lean,Mathlib/RingTheory/Localization/Defs.lean	4	1	['github-actions']	nobody	22-79397 22 days ago	22-79411 22 days ago	40-19171 40 days
23367	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup/Reduce): add lemmas for toWord and reduce	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR adds some simple helper lemmas for the interaction of `toWord` and `reduce` and basic list / group operations. The RHS of the lemmas often contains more appearances of `reduce`, so they are not marked as `simp` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-geometric-group-theory t-algebra label:t-algebra$	24/0	Mathlib/GroupTheory/FreeGroup/Reduce.lean	1	1	['github-actions']	nobody	22-69336 22 days ago	22-69336 22 days ago	22-78015 22 days
23368	b-reinke author:b-reinke	feat(GroupTheory/FreeGroup/ReducedWords): add theory of reduced words	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR adds the file `GroupTheory/FreeGroup/ReducedWords.lean`, where the predicate of reduced words is defined. It is shown that `reduce` and `toWord` produce reduced words. This is done in preparation for the theory of cyclically reduced words. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-geometric-group-theory t-algebra label:t-algebra$	124/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	2	1	['github-actions']	nobody	22-69316 22 days ago	22-69316 22 days ago	22-77150 22 days
22137	grunweg author:grunweg	feat: `IsEmbedding.sumElim_of_separatingNhds`	Characterise when the `Sum.elim` of two inducing maps resp. embeddings is an embedding, and deduce that the ranges of the two maps lying in separated neighbourhoods suffices. This will be used in my bordism theory project. ------------ - [x] depends on: #22827 (for breaking the import cycle) - [ ] depends on: #22969 - [ ] depends on: #22964 - [ ] depends on: #23371 (for the previous PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology awaiting-author blocked-by-other-PR	209/10	Mathlib/Data/Set/Image.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/Order/Filter/Map.lean,Mathlib/Topology/Constructions/SumProd.lean	4	22	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'plp127']	nobody	22-65311 22 days ago	22-65314 22 days ago	0-0 0 seconds
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-algebra WIP label:t-algebra$	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	5	['AntoineChambert-Loir', 'github-actions']	nobody	22-63417 22 days ago	25-62147 25 days ago	11-9349 11 days
9820	jjaassoonn author:jjaassoonn	feat(RingTheory/GradedAlgebra/HomogeneousIdeal): generalize to homogeneous submodule	The definitions, constructions and theorems in `HomogeneousIdeal.lean` are generalized to a homogeneous submodules. So say $R$ is a ring and $M \cong \bigoplus_{i} M_i$ is an $R$-module. Then a homogeneous $R$-submodule of $M$ is an $R$-submodule $N$ such that for all $i$ and $n \in N$, $n_i \in N$. Note that this notion doesn't actually require $R$ to be graded and $M$ is a graded module. But for more interesting lemmas, we do need that $M$ is graded $R$-module. We bake the fact $R$ is graded into the definition of homogeneous submodule, otherwise, `CompleteLattice HomogeneousSubmodule` cannot find the order of synthesis (the proof depends on that $R$ is graded) All definitions/constructions/theorems have a copy for ideals as well, this is to make sure dot notation still works. The motivation of this generalization is graded quotient module --- - [ ] depends on:#18728 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	515/185	Mathlib/Algebra/Module/GradedModule.lean,Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Scheme.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Ideal.lean,Mathlib/RingTheory/GradedAlgebra/Homogeneous/Submodule.lean,scripts/nolints_prime_decls.txt	5	2	['github-actions']	nobody	22-52368 22 days ago	65-24420 2 months ago	95-75561 95 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 blocked-by-other-PR	146/4	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/UniformSpace/Compact.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-51379 22 days ago	23-34397 23 days ago	0-0 0 seconds
23198	robin-carlier author:robin-carlier	feat(CategoryTheory/Equivalence): functoriality of symmetry of equivalences	We introduce a file `CategoryTheory/Equivalence/Symmetry` in which we continue to provide basic API for the category structure on equivalences defined in #23197. We prove that symmetry of equivalences defines an equivalence `(C ≌ D) ≌ (D ≌ C)ᵒᵖ`, and we use this to construct `Equivalence.inverseFunctor: (C ≌ D) ⥤ (D ⥤ C)ᵒᵖ` that takes an equivalence to its inverse functor, and to promote `Equivalence.congrLeft` to a functor. --- - [ ] depends on: #23197 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	188/0	Mathlib.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Equivalence/Symmetry.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-51321 22 days ago	22-71299 22 days ago	4-84589 4 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 awaiting-author label:t-algebra$	16/5	Mathlib/RingTheory/OreLocalization/Basic.lean	1	5	['erdOne', 'github-actions', 'kbuzzard']	nobody	22-50078 22 days ago	22-50078 22 days ago	53-20069 53 days
23197	robin-carlier author:robin-carlier	feat(CategoryTheory/Equivalences): category structure on equivalences	We put a category structure on `(C ≌ D)`. The morphisms are simply natural transformations between the underlying functor. We also provide various API for this structure. --- While this PR contains functoriality of the operation that maps an equivalence to its underlying functor, functoriality of inverses will be in a different PR and recorded in a different file : I feel the most natural way to do this is to bring in the results from `Adjunction.Mates`, but this imports quite a lot of stuff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	69/0	Mathlib/CategoryTheory/Equivalence.lean	1	7	['github-actions', 'joelriou', 'robin-carlier']	nobody	22-49939 22 days ago	22-49939 22 days ago	28-28142 28 days
22870	kebekus author:kebekus	feat: behavior of MeromorphicAt.order under powers and inverses	Establish the behavior of `MeromorphicAt.order` under standard operations, including powers and inverses. The results are completely analogous to the existing theorems for `AnalyticAt.order`. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	26/12	Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Order/WithBot.lean	2	1	['github-actions']	nobody	22-47481 22 days ago	22-47496 22 days ago	37-14441 37 days
22964	plp127 author:plp127	feat(Data/Set/Image): `Sum.elim` lemmas	This PR adds some `Sum.elim` lemmas for images and preimages of sets. Used in #22137. --- - [ ] depends on: #23371 (the simp changes discussed for this PR) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-author blocked-by-other-PR	41/13	Mathlib/Data/Set/Disjoint.lean,Mathlib/Data/Set/Image.lean,Mathlib/Topology/Compactification/OnePoint.lean	3	44	['YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'plp127', 'urkud']	nobody	21-73715 21 days ago	22-65352 22 days ago	1-39291 1 day
23184	mariainesdff author:mariainesdff	feat(Analysis/Normed/Unbundled/AlgNormOfGalois): add algNorm_of_galois	Let `K` be a nonarchimedean normed field and `L/K` be a finite extension. We show that the function `L → ℝ` sending `x : L` to the maximum of `‖ σ x ‖` over all `σ : L ≃ₐ[K] L` is an algebra norm on `L`. We also prove that this algebra norm is power multiplicative, nonarchimedean, and extends the norm on `K`. --- - [ ] depends on: #23178 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis t-number-theory blocked-by-other-PR	221/1	Mathlib.lean,Mathlib/Analysis/Normed/Unbundled/AlgNormOfGalois.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	21-73613 21 days ago	28-63461 28 days ago	0-699 11 minutes
23281	mattrobball author:mattrobball	test			12/10	Mathlib/AlgebraicGeometry/Cover/Open.lean,Mathlib/Analysis/Normed/Unbundled/SeminormFromConst.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/Order/Part.lean,Mathlib/RingTheory/Extension.lean,Mathlib/RingTheory/Kaehler/CotangentComplex.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean	7	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	21-63824 21 days ago	25-40145 25 days ago	0-0 0 seconds
22050	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): Add `SimpleGraph.Preconnected.support_eq_univ`	Co-authored-by: Kyle Miller kmill31415@gmail.com --- Suggested in [zulip](https://leanprover.zulipchat.com/#narrow/channel/252551-graph-theory/topic/Way.20ConnectedComponent.20definition.20uses.20Quot.3F) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	44/0	Mathlib/Combinatorics/SimpleGraph/Path.lean	1	4	['b-mehta', 'github-actions', 'urkud']	b-mehta assignee:b-mehta	20-63177 20 days ago	20-63190 20 days ago	51-82600 51 days
23309	kkytola author:kkytola	feat: left/right order-continuous functions are left/right topology-continuous	Order left/right-continuous functions on (densely ordered) conditionally complete linear orders are topologically left/right-continuous. Co-authored-by: Yaël Dillies --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	27/3	Mathlib/Topology/Order/Basic.lean	1	3	['YaelDillies', 'github-actions', 'kkytola']	nobody	20-62676 20 days ago	24-57257 24 days ago	24-57243 24 days
23334	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add lemmas about Field.toEuclideanDomain	The behaviour of mod and gcd in a field are somewhat unexpected. I think that adding simp lemmas to reduce them to more well-understood notions will be helpful for people who accidentally end up using them, even if the right-hand side is not necessarily "simp"ler on first sight. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	21/2	Mathlib/Algebra/EuclideanDomain/Field.lean	1	6	['Ruben-VandeVelde', 'acmepjz', 'github-actions']	nobody	20-41730 20 days ago	23-79526 23 days ago	23-79582 23 days
23446	acmepjz author:acmepjz	feat(Algebra/Exact): add `Function.Exact.[iff_]rangeFactorization` etc	Two maps `f : M → N` and `g : N → P` are exact if and only if the induced maps `Set.range f → N → Set.range g` are exact. Same for `AddMonoidHom` and `LinearMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discussion: [#Is there code for X? > Function.Exact.rangeFactorization](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Function.2EExact.2ErangeFactorization)	t-algebra label:t-algebra$	41/2	Mathlib/Algebra/Exact.lean	1	1	['github-actions']	nobody	20-4583 20 days ago	20-4583 20 days ago	20-4569 20 days
23460	Timeroot author:Timeroot	feat: Definition of `Clone`	Basics about Clones. Part of #20051 --- - [ ] depends on: #23459 [![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	19-45465 19 days ago	19-45465 19 days ago	0-1312 21 minutes
23461	xroblot author:xroblot	feat(GroupTheory/Cyclic): formula for the card & index of kernel & range of powMonoidHom on a cyclic group	We prove formula for the cardinal and index of the kernel and range of `powMonoidHom : x ↦ x ^ d` on a finite cyclic group. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	48/0	Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean	2	1	['github-actions']	nobody	19-43954 19 days ago	19-44104 19 days ago	19-44150 19 days
21283	erdOne author:erdOne	feat: topology on Hom(R, S) in `CommRingCat`	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	227/0	Mathlib.lean,Mathlib/Algebra/Category/Ring/Constructions.lean,Mathlib/Algebra/Category/Ring/Topology.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,scripts/noshake.json	6	5	['dagurtomas', 'erdOne', 'github-actions']	nobody	19-41965 19 days ago	19-41965 19 days ago	57-84018 57 days
23394	BoltonBailey author:BoltonBailey	chore(Data/Int/WithZero): fix erw	Removing an `erw`. This is my first time doing this, so please tell me if I am doing something wrong here (e.g. should the new lemma be `simp`?). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt awaiting-author	4/2	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Data/Int/WithZero.lean	2	8	['BoltonBailey', 'eric-wieser', 'github-actions']	nobody	19-40276 19 days ago	19-40276 19 days ago	2-50897 2 days
21693	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/)	t-analysis awaiting-author	96/0	Mathlib.lean,Mathlib/Analysis/SpecificLimits/InvPow.lean	2	10	['erdOne', 'eric-wieser', 'github-actions', 'j-loreaux']	nobody	19-23564 19 days ago	63-63035 2 months ago	3-59857 3 days
23431	JovanGerb author:JovanGerb	feat: Imo2020 q6	I formalized IMO2020 Q6. I followed the solution that I found when I was marticipating in the exam. I used the statement formalization that was given by @jsm28. Some lemmas should be added to mathlib itself instead of the IMO2020Q6 file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	IMO	377/0	Archive.lean,Archive/Imo/Imo2020Q6.lean	2	2	['github-actions', 'jsm28']	nobody	19-7917 19 days ago	20-69849 20 days ago	0-0 0 seconds
23266	mariainesdff author:mariainesdff	feat(Algebra/Order/BigOperator): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order t-algebra label:t-algebra$	68/1	Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Data/Finset/Max.lean	3	1	['github-actions']	nobody	18-84623 18 days ago	25-57436 25 days ago	25-57480 25 days
23498	Ruben-VandeVelde author:Ruben-VandeVelde	chore(Topology.MetricSpace.Lipschitz): stop depending on Topology.Algebra	Noticed while playing with the new `directoryDependency` linter. Not sure if these could be proved without assuming the continuity of real multiplication. Copyright from https://github.com/leanprover-community/mathlib3/pull/1921 and https://github.com/leanprover-community/mathlib4/pull/11840. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		60/34	Mathlib.lean,Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Topology/Algebra/MetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/Algebra.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Lipschitz.lean,Mathlib/Topology/MetricSpace/PiNat.lean	9	1	['github-actions']	nobody	18-69414 18 days ago	18-69474 18 days ago	18-69460 18 days
23425	vasnesterov author:vasnesterov	feat(Algebra/BigOperators): simprocify `prod_univ_one/two/three/...`	Add a simproc `prod_univ_many` that rewrites `∏ (i : Fin n), f i` as `f 0 * f 1 * ... * f (n - 1)`, generalizing `prod_univ_one`, `prod_univ_two`, ..., `prod_univ_eight`. --- It seems impossible to use to_additive here to avoid reimplementing the same simproc for additive goals. Just wanted to hear your ideas, before doing it. - [x] depends on: #23427 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	51/0	Mathlib/Data/Fin/Tuple/Reflection.lean	1	9	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'vasnesterov']	nobody	18-62394 18 days ago	19-16166 19 days ago	19-65038 19 days
23502	Timeroot author:Timeroot	feat(ModelTheory/Semantics): BoundedFormula.realize_foldr_imp	Two lemmas for `realize`ing a `BoundedFormula`. --- Pulled out from #19695. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic	20/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	1	['github-actions']	nobody	18-59207 18 days ago	18-60107 18 days ago	18-60162 18 days
23470	erdOne author:erdOne	feat(AlgebraicGeometry): section of a k-scheme is a closed immersion	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	89/3	Mathlib/AlgebraicGeometry/Limits.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/PullbackCarrier.lean,Mathlib/AlgebraicGeometry/Pullbacks.lean,Mathlib/AlgebraicGeometry/Scheme.lean	6	7	['chrisflav', 'github-actions']	nobody	18-47846 18 days ago	19-18856 19 days ago	19-18886 19 days
21909	erdOne author:erdOne	feat(RingTheory/Invariants): Generalize to profinite groups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	350/5	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Operations.lean,Mathlib/NumberTheory/RamificationInertia/Galois.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/RingTheory/Invariant/Basic.lean,Mathlib/RingTheory/Invariant/Profinite.lean	6	2	['TwoFX', 'github-actions']	nobody	18-34347 18 days ago	18-34347 18 days ago	22-22526 22 days
22265	Timeroot author:Timeroot	feat(Geometry/Euclidean/Angle/Unoriented): triangle inequality	filled in a `proof_wanted` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	78/12	Mathlib.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Affine.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/TriangleInequality.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean	5	7	['Timeroot', 'github-actions', 'jsm28', 'urkud']	nobody	18-17846 18 days ago	18-54760 18 days ago	38-58541 38 days
22909	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/Pure): pure submodules	A submodule `N` of an `R`-module is pure if all maps `S ⊗[R] N → S ⊗[R] M` deduced by base change from the injection of `N` into `M` are injective, for all `R`-algebras `S`. This is expressed by the class `Submodule.IsPure`. For type theoretic reason, the definition of `Submodule.IsPure` only considers algebras `S` in the same universe as `R`, but `Submodule.IsPure.baseChange_injective` establishes the property for all universes. * `Submodule.IsComplemented.isPure` : a complemented submodule is pure. Co-authored with @mariainesdff --- - [ ] depends on: #22898 - [ ] depends on: #22908 - [ ] depends on: #22911 [![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$	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	18-6229 18 days ago	18-6247 18 days ago	0-1047 17 minutes
23527	erdOne author:erdOne	feat(Topology): subspace of quotient topology is quotient of subspace topology	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	69/0	Mathlib/Topology/Maps/OpenQuotient.lean	1	1	['github-actions']	nobody	17-85156 17 days ago	17-85245 17 days ago	17-85231 17 days
21837	yu-yama author:yu-yama	feat(GroupExtension/Abelian): define `conjClassesEquivH1`	As the third part of #19582, this PR adds the first part of the `Abelian` file. It mainly: - defines `SemidirectProduct.conjClassesEquivH1`, a bijection between the conjugacy classes of splittings of a group extension associated to a semidirect product and $H^1 (G, N)$. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	129/3	Mathlib.lean,Mathlib/GroupTheory/GroupExtension/Abelian.lean,Mathlib/GroupTheory/GroupExtension/Defs.lean,docs/references.bib	4	4	['erdOne', 'github-actions']	erdOne assignee:erdOne	17-83423 17 days ago	17-83423 17 days ago	46-55213 46 days
23528	Ruben-VandeVelde author:Ruben-VandeVelde	feat: add isOpen_setOf_affineIndependent	From sphere-eversion. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	15/0	Mathlib/Analysis/Normed/Module/FiniteDimension.lean	1	1	['github-actions']	nobody	17-82840 17 days ago	17-82840 17 days ago	17-82887 17 days
22635	Kiolt author:Kiolt	feat: submonoid of pairs with quotient in a submonoid	This submonoid is part of the definition of toric ideals. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-algebra label:t-algebra$	36/0	Mathlib.lean,Mathlib/GroupTheory/MonoidLocalization/DivPairs.lean	2	10	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	17-80464 17 days ago	17-80517 17 days ago	43-67450 43 days
23497	chrisflav author:chrisflav	chore(RingTheory/AdicCompletion/AsTensorProduct): golf using five lemma for modules	--- - [ ] depends on: #23496 [![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$	188/81	Mathlib.lean,Mathlib/Algebra/FiveLemma.lean,Mathlib/RingTheory/AdicCompletion/AsTensorProduct.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	17-74450 17 days ago	18-69138 18 days ago	0-843 14 minutes
22151	alreadydone author:alreadydone	feat(RingTheory): a semiprimary ring is Noetherian/Artinian iff its Jacobson radical is fg	A key fact used is `Module.FG.smul`: if `I` is a two-sided ideal of `R` that is f.g. as a left ideal and `N` is a f.g. `R`-module, then `I • M` is also a f.g. `R`-module. Many lemmas about coprimality of ideals are also generalized to the noncommutative, two-sided setting. --- - [x] depends on: #21904 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	216/156	Mathlib/Algebra/Algebra/Operations.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/RingTheory/Extension.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/HopkinsLevitzki.lean,Mathlib/RingTheory/Ideal/Maps.lean,Mathlib/RingTheory/Ideal/Operations.lean	8	4	['alreadydone', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	17-69268 17 days ago	18-60011 18 days ago	45-68077 45 days
23555	Komyyy author:Komyyy	feat(Mathlib/GroupTheory/SpecificGroups/Alternating): A_n is simple iff n = 3 or 5 ≤ n	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra WIP label:t-algebra$	278/11	Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/Subgroup/Simple.lean	4	5	['Komyyy', 'acmepjz', 'github-actions', 'tb65536']	nobody	17-52414 17 days ago	17-59048 17 days ago	0-0 0 seconds
22089	sgouezel author:sgouezel	feat: composing a continuous multilinear map with continuous linear maps is analytic in both variables	Also prove that the composition of continuously polynomial functions is continuously polynomial. --- - [x] depends on: #22102 - [x] depends on: #22789 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	209/3	Mathlib/Analysis/Analytic/CPolynomial.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Data/Multiset/DershowitzManna.lean,Mathlib/Order/KrullDimension.lean	5	7	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot', 'sgouezel']	nobody	17-48114 17 days ago	17-48128 17 days ago	56-14679 56 days
22355	xyzw12345 author:xyzw12345	feat(Algebra/RingQuot): Some lemmas about `RingQuot.mkAlgHom` and `RingQuot.mkRingHom`	This PR provides a few basic lemmas about `RingQuot.mkRingHom` and `RingQuot.mkAlgHom`. These lemmas are about when are two elements mapped to the same one under these two maps, and they correspond to the lemma `Quot.eq`. PR #22279 depends on these lemmas. --- [![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$	16/0	Mathlib/Algebra/RingQuot.lean	1	13	['Paul-Lez', 'erdOne', 'eric-wieser', 'github-actions', 'ocfnash', 'xyzw12345']	nobody	17-9157 17 days ago	17-82880 17 days ago	32-33842 32 days
22279	xyzw12345 author:xyzw12345	feat(RingTheory/GradedAlgebra): homogeneous relation	In this PR, we defined the concept of a homogeneous relation and proved some properties about homogeneous relations. The main result of this PR is showing that taking `RingQuot` by a homogeneous relation can give a graded structure on the quotient ring. This result can be used to define graded structures on rings obtained using `RingQuot`, e.g. the Symmetric Algebra defined in #21539 can be verified to have such a structure. Co-authored-by: Zhixuan Dai @atstarrysky <22300180006@m.fudan.edu.cn> Yiming Fu @pelicanhere Zhenyan Fu @pumpkin678 Raphael Douglas Giles @Raph-DG Jiedong Jiang @jjdishere - [x] depends on: #22354 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	455/0	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/RingQuot.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousRelation.lean	8	6	['Paul-Lez', 'github-actions', 'mathlib4-dependent-issues-bot', 'ocfnash', 'xyzw12345']	nobody	17-8647 17 days ago	17-8650 17 days ago	18-40441 18 days
23496	chrisflav author:chrisflav	chore(Algebra): the five lemma for modules	We reprove the five lemma for modules for universe generality, avoiding the import of `Mathlib.CategoryTheory.Abelian.DiagramLemmas.Four` in otherwise non-category-theoretic files and for ease of application. --- See #23497 for a golf using this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	158/0	Mathlib.lean,Mathlib/Algebra/FiveLemma.lean	2	7	['acmepjz', 'chrisflav', 'erdOne', 'github-actions']	nobody	17-8005 17 days ago	18-70052 18 days ago	18-70038 18 days
21829	Whysoserioushah author:Whysoserioushah	feat(LinearAlgebra/TensorProduct/HomTensor): Add TensorProduct of Hom-modules	Co-authored-by: Andrew Yang --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	16-76596 16 days ago	17-83116 17 days ago	46-53384 46 days
23531	fpvandoorn author:fpvandoorn	refactor: generalize `unbounded_of_tendsto_atTop`	--- Not sure if I like this style of proofs with `aesop` for future PRs. It's short, though. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	13/19	Mathlib/Order/Filter/AtTopBot/Basic.lean	1	2	['github-actions', 'sgouezel']	nobody	16-74710 16 days ago	17-77144 17 days ago	17-77130 17 days
23426	idontgetoutmuch author:idontgetoutmuch	G-Bundle and examples	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	576/0	Mathlib/Topology/FiberBundle/Instances/GBundleDefs.lean,Mathlib/Topology/FiberBundle/Instances/Mobius.lean,Mathlib/Topology/FiberBundle/Instances/MobiusAsGBundle.lean	3	2	['eric-wieser', 'idontgetoutmuch']	nobody	16-69072 16 days ago	16-69072 16 days 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	72/5	Mathlib/Util/CountHeartbeats.lean,MathlibTest/CountHeartbeats.lean	2	16	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	nobody	16-66905 16 days ago	16-67390 16 days ago	19-14394 19 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	1	['github-actions']	nobody	16-60152 16 days ago	16-78066 16 days ago	0-0 0 seconds
21985	FernandoChu author:FernandoChu	feat(CategoryTheory): the Grothendieck construction is prefibered	Adds a `isPreFibered` instance for the Grothendieck construction. Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory awaiting-author	55/0	Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	2	14	['chrisflav', 'github-actions']	nobody	16-57767 16 days ago	16-57772 16 days ago	8-4256 8 days
23282	joelriou author:joelriou	feat(CategoryTheory): monomorphisms in Type are stable under transfinite compositions	`monomorphisms (Type u)` is stable under cobase change, filtered colimits and transfinite compositions. (The file `CategoryTheory.Types` is also moved to `CategoryTheory.Types.Basic`.) (This is extended to presheaves of types in #23298.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	159/15	Mathlib.lean,Mathlib/CategoryTheory/Category/Cat.lean,Mathlib/CategoryTheory/Category/RelCat.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConcreteCategory/EpiMono.lean,Mathlib/CategoryTheory/Core.lean,Mathlib/CategoryTheory/Functor/Hom.lean,Mathlib/CategoryTheory/IsomorphismClasses.lean,Mathlib/CategoryTheory/Limits/Types/Shapes.lean,Mathlib/CategoryTheory/Monad/Types.lean,Mathlib/CategoryTheory/MorphismProperty/TransfiniteComposition.lean,Mathlib/CategoryTheory/SmallObject/WellOrderInductionData.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/CategoryTheory/Types/Basic.lean,Mathlib/CategoryTheory/Types/Monomorphisms.lean,Mathlib/CategoryTheory/UnivLE.lean,Mathlib/Control/Fold.lean,Mathlib/Data/Set/FunctorToTypes.lean	18	1	['github-actions']	nobody	16-53864 16 days ago	16-54856 16 days ago	25-33717 25 days
6718	FR-vdash-bot author:FR-vdash-bot	feat: Lindemann-Weierstrass Theorem	--- There's still a lot of work to be done before it gets into mathlib. - [x] depends on: #6593 - [x] depends on: #6719 - [x] depends on: #6723 - [x] depends on: #6740 - [x] depends on: #7274 - [x] depends on: #8807 - [x] depends on: #12191 - [x] depends on: #12764 - [x] depends on: #16259 - [x] depends on: #16262 - [x] depends on: #16886 - [x] depends on: #16898 - [x] depends on: #16923 - [x] depends on: #16933 - [x] depends on: #17119 - [x] depends on: #17893 - [x] depends on: #17894 - [x] depends on: #17896 - [x] depends on: #18556 - [ ] depends on: #18693 - [x] depends on: #19225 - [x] depends on: #19246 - [x] depends on: #20092 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis blocked-by-other-PR WIP label:t-algebra$	1360/51	Mathlib.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/FieldTheory/Minpoly/ConjRootClass.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AlgebraicPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AnalyticalPart.lean,Mathlib/NumberTheory/Transcendental/Lindemann/Basic.lean,Mathlib/NumberTheory/Transcendental/Lindemann/SumAEvalARoots.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/Eval.lean,docs/100.yaml,docs/1000.yaml	11	n/a	['FR-vdash-bot', 'Ruben-VandeVelde', 'acmepjz', 'alreadydone', 'eric-wieser', 'github-actions', 'j-loreaux', 'jcommelin', 'jjdishere', 'mathlib4-dependent-issues-bot']	Ruben-VandeVelde assignee:Ruben-VandeVelde	16-51725 16 days ago	unknown	unknown
20051	Timeroot author:Timeroot	feat: `Clone` and some instances	Defines operads (`Operad`), symmetric operads (`SymmOperad`), and clones (`Clone`). There is a proof that all clones have a natural operad structure. 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 the completeness of Post's Lattice is why I'm making this PR. --- - [x] depends on: #20133 [basics and notations] - [x] depends on: #20134 [permutations] - [x] depends on: #20138 [operad] - [x] depends on: #20141 [clone] - [ ] 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	16-39267 16 days ago	19-45508 19 days ago	43-16103 43 days
17802	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Veblen): epsilon and gamma ordinals	We define the epsilon function `ε_ o = veblen 1 o`, and the gamma function `Γ_ o` which enumerates the fixed points of `veblen · 0`. --- - [x] depends on: #17751 - [x] depends on: #18611 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge	146/7	Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	2	15	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	16-23351 16 days ago	16-23351 16 days ago	48-35738 48 days
18210	vihdzp author:vihdzp	feat(Order/Hom/Basic): `WithBot (Fin n) ≃o Fin (n + 1)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	16/0	Mathlib/Order/Hom/Basic.lean	1	7	['Command-Master', 'Ruben-VandeVelde', 'github-actions', 'urkud', 'vihdzp']	nobody	16-18553 16 days ago	165-30277 5 months ago	10-77913 10 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 label:t-algebra$	298/0	Mathlib.lean,Mathlib/Topology/Algebra/Valued/AdicExpansion.lean	2	2	['Thmoas-Guan', 'github-actions']	nobody	16-13393 16 days ago	54-18597 1 month ago	54-18726 54 days
19946	vihdzp author:vihdzp	feat(SetTheory/ZFC/Basic): order instances	Sets form a partial order under the subset relation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory	38/2	Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Class.lean,Mathlib/SetTheory/ZFC/PSet.lean	3	8	['alreadydone', 'b-mehta', 'github-actions', 'vihdzp']	nobody	16-7569 16 days ago	16-11931 16 days ago	47-12661 47 days
23370	kebekus author:kebekus	feat: taking the divisor of a meromorphic function commutes with restriction	Deliver on a very simple TODO, show that taking the divisor of a meromorphic function commutes with restriction. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	12/1	Mathlib/Analysis/Meromorphic/Divisor.lean	1	1	['github-actions']	nobody	16-3867 16 days ago	16-3882 16 days ago	22-68841 22 days
23363	kebekus author:kebekus	feat: congruence lemmas for divisors of meromorphic functions	Deliver on open TODO and state elementary congruence lemmas for divisors of meromorphic functions. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	78/1	Mathlib/Analysis/Meromorphic/Basic.lean,Mathlib/Analysis/Meromorphic/Divisor.lean	2	1	['github-actions']	nobody	16-3625 16 days ago	16-3640 16 days ago	22-81085 22 days
22574	joelriou author:joelriou	refactor(CategoryTheory): redefine full subcategories using `ObjectProperty`	The type `ObjectProperty` was recently introduced #22286 for predicates on the objects of a category. We redefine `FullSubcategory` as `ObjectProperty.FullSubcategory`. This refactor PR mostly does only minimal changes to take into account that some definitions were renamed. The only significant exception is for the definition of the category of finitely generated modules in `Algebra.Category.FGModuleCat.Basic`, which should become the better practice for defining full subcategories, especially when we want to infer certain type classes: define a property of objects (here `ModuleCat.isFG`) and define the category as an abbreviation (here `abbrev FGModuleCat := (ModuleCat.isFG R).FullSubcategory`). Following this approach, significantly many of the typeclasses on the category `FGModuleCat R` can be inferred automatically. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	711/678	Mathlib.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/FGModuleCat/Limits.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pullback.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicTopology/SimplexCategory/Defs.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Adjunction/PartialAdjoint.lean,Mathlib/CategoryTheory/Adjunction/Reflective.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/ConnectedComponents.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/EssentialImage.lean,Mathlib/CategoryTheory/EssentiallySmall.lean,Mathlib/CategoryTheory/Filtered/Small.lean,Mathlib/CategoryTheory/FullSubcategory.lean,Mathlib/CategoryTheory/Groupoid.lean,Mathlib/CategoryTheory/InducedCategory.lean,Mathlib/CategoryTheory/Limits/ExactFunctor.lean,Mathlib/CategoryTheory/Limits/FinallySmall.lean,Mathlib/CategoryTheory/Limits/FullSubcategory.lean,Mathlib/CategoryTheory/Limits/Indization/Category.lean,Mathlib/CategoryTheory/Limits/Indization/LocallySmall.lean,Mathlib/CategoryTheory/Linear/Basic.lean,Mathlib/CategoryTheory/Linear/LinearFunctor.lean,Mathlib/CategoryTheory/Localization/Construction.lean,Mathlib/CategoryTheory/Localization/Predicate.lean,Mathlib/CategoryTheory/Monoidal/NaturalTransformation.lean,Mathlib/CategoryTheory/Monoidal/Subcategory.lean,Mathlib/CategoryTheory/MorphismProperty/IsInvertedBy.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/ObjectProperty/FullSubcategory.lean,Mathlib/CategoryTheory/Preadditive/AdditiveFunctor.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/Indization.lean,Mathlib/CategoryTheory/Sites/EffectiveEpimorphic.lean,Mathlib/CategoryTheory/Sites/SheafOfTypes.lean,Mathlib/CategoryTheory/Sites/Sieves.lean,Mathlib/CategoryTheory/Subobject/MonoOver.lean,Mathlib/CategoryTheory/Subterminal.lean,Mathlib/Topology/Category/TopCat/OpenNhds.lean,Mathlib/Topology/Sheaves/Alexandrov.lean,Mathlib/Topology/Sheaves/SheafCondition/OpensLeCover.lean,Mathlib/Topology/Sheaves/SheafCondition/PairwiseIntersections.lean	48	1	['github-actions']	nobody	15-83377 15 days ago	15-86093 15 days ago	42-39708 42 days
21966	vasnesterov author:vasnesterov	feat(Tactic/Order): support `⊤`, `⊥`, and lattice operations	Support `⊤`, `⊥`, and lattice operations in the `order` tactic. --- - [x] depends on: #21877 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	227/47	Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Preprocessing.lean,MathlibTest/order.lean,scripts/noshake.json	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-82102 15 days ago	15-82118 15 days ago	49-78617 49 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 awaiting-author	95/38	Mathlib/AlgebraicGeometry/Modules/Sheaf.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean	2	3	['chrisflav', 'github-actions']	nobody	15-76555 15 days ago	15-76555 15 days ago	0-71091 19 hours
23627	kebekus author:kebekus	feat: add logarithmic counting function of Value Distribution Theory	Implement the logarithmic counting function of Value Distribution Theory and provide supporting API. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	217/0	Mathlib.lean,Mathlib/Analysis/Complex/ValueDistribution/CountingFunction.lean	2	1	['github-actions']	nobody	15-74016 15 days ago	15-74286 15 days ago	15-74343 15 days
22052	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Lambda-squared sieves and prove important properties	This PR: * Defines lambda-squared sieves. * Proves they are upper bound sieves. * Proves that the corresponding main sum is a quadratic form. --- - [x] depends on: #21880 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-number-theory	247/1	Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/NumberTheory/SelbergSieve.lean	2	6	['Ruben-VandeVelde', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-70487 15 days ago	30-62620 30 days ago	30-62605 30 days
23632	JovanGerb author:JovanGerb	perf(CategoryTheory/Subobject/Lattice): reorder instance arguments	The `HasImages C` type class fails more quickly, so I set it as the first type class argument. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	4/5	Mathlib/CategoryTheory/Subobject/Lattice.lean	1	4	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	15-67321 15 days ago	15-69375 15 days ago	15-69425 15 days
23635	FLDutchmann author:FLDutchmann	feat(NumberTheory/SelbergSieve): define Selberg's weights and prove basic results.	This PR defines weights used by Selberg's lambda squared sieve. Though we don't prove it, these weights minimise the main sum under the constraint that the weights are supported up to $\sqrt{y}$. --- - [ ] depends on: #22052 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-number-theory blocked-by-other-PR	403/1	Mathlib/Data/Nat/GCD/Basic.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/SelbergSieve.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-63401 15 days ago	15-64230 15 days ago	0-18 18 seconds
13349	CBirkbeck author:CBirkbeck	feat: TendstoUniformlyOn for tprod's	Give conditions for prods to converge uniformly to a tprod. --- - [x] depends on: #16543 - [x] depends on: #16546 - [x] depends on: #15398 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	124/25	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Topology/UniformSpace/MultipliableTendstoUniformly.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean	5	53	['ADedecker', 'CBirkbeck', 'github-actions', 'j-loreaux', 'loefflerd', 'mathlib4-dependent-issues-bot']	nobody	15-51271 15 days ago	15-51271 15 days ago	34-58455 34 days
23658	grunweg author:grunweg	feat: require that real or complex models with corners have convex interior	Follow-up to #18403. --- - [ ] depends on: #23657 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	115/18	Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	15-549 15 days ago	15-551 15 days ago	0-9 9 seconds
22366	kim-em author:kim-em	feat: `check_equalities` tactic for diagnosing defeq problems	The `check_equalities` tactic, which checks the typing of equalities in the goal, reporting discrepancies between the implicit type argument of the equality, and the inferred types of the left and right hand sides, at "instances and reducible" transparency. Reports from this tactic do not necessarily indicate a problem, although typically `simp` should reduce rather than increase the reported discrepancies. `check_equalities` may be useful in diagnosing uses of `erw`.	t-meta delegated	119/3	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	12	['adomani', 'b-mehta', 'eric-wieser', 'github-actions', 'mathlib-bors']	nobody	14-71075 14 days ago	35-61300 1 month ago	15-14325 15 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	14-66435 14 days ago	14-66435 14 days ago	23-44995 23 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	34/11	Cache/IO.lean,Cache/Main.lean	2	9	['eric-wieser', 'github-actions', 'joneugster', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	14-65472 14 days ago	14-65472 14 days ago	17-48864 17 days
23657	grunweg author:grunweg	feat: euclidean half spaces and quadrants have convex interior	These lemmas are a prerequisite for #23658, which will impose that real or complex models with corners have convex interior. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	48/0	Mathlib/Geometry/Manifold/Instances/Real.lean	1	9	['Ruben-VandeVelde', 'github-actions', 'grunweg']	nobody	14-62087 14 days ago	15-852 15 days ago	15-838 15 days
23603	YaelDillies author:YaelDillies	feat: distributive Haar characters	The name is made up in analogy with modular characters. From FLT Co-authored-by: Andrew Yang Co-authored-by: Javier López-Contreras <38789151+javierlcontreras@users.noreply.github.com> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-measure-probability	87/0	Mathlib.lean,Mathlib/MeasureTheory/Measure/Haar/DistribChar.lean	2	5	['AntoineChambert-Loir', 'YaelDillies', 'github-actions', 'tb65536']	nobody	14-60349 14 days ago	15-71817 15 days ago	16-45940 16 days
23673	erdOne author:erdOne	feat(AlgebraicGeometry): delaborator for coercing schemes to types	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	21/0	Mathlib/AlgebraicGeometry/Scheme.lean	1	1	['github-actions']	nobody	14-57936 14 days ago	14-57936 14 days ago	14-57987 14 days
23440	xroblot author:xroblot	chore(NumberField/Units): make `torsionOrder` a `Nat`	Originally, the order of the torsion subgroup of units of a number field was defined as a `PNat` since `rootsOfUnity` was using `PNat`. This is not the case anymore since `rootsOfUnity` is now using `NeZero` instead. Thus, we change the type of `torsionOrder` to `Nat` and change to an `abbrev` so that it gets a `NeZero` instance automatically. As a bonus, we also prove that `torsionOrder` is even. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	17/6	Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean	2	1	['github-actions']	nobody	14-57645 14 days ago	20-52609 20 days ago	20-52653 20 days
23424	YaelDillies author:YaelDillies	chore: move `StrictMonoOn f s → InjOn f s` earlier	This is motivated by the need to have these lemmas early in #23177. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order	29/34	Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Data/Int/Lemmas.lean,Mathlib/Data/Set/Monotone.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Hom/Set.lean,Mathlib/Order/Interval/Set/Monotone.lean,Mathlib/Order/ModularLattice.lean,Mathlib/Order/Monotone/Basic.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Order/Monotone/Extension.lean	10	1	['github-actions']	nobody	14-50106 14 days ago	14-50120 14 days ago	20-62805 20 days
23676	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` for localizations and quotients	All these removed instances of `induction'` generate only one subgoal. In some cases `obtain` can be used. The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..08c06520879 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if subgoals.toList.length ≤ 1 then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14270845291/job/40003467676).	tech debt	87/108	Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Pointwise/Stabilizer.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/FactorThru.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/Nat/ChineseRemainder.lean,Mathlib/Data/Setoid/Partition.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/OreLocalization/Ring.lean,Mathlib/SetTheory/Surreal/Basic.lean	25	7	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	14-26407 14 days ago	14-47449 14 days ago	14-47435 14 days
23678	plp127 author:plp127	feat: recursor for nonempty lists	Adds `List.recNeNil` and `List.recOnNeNil` for motives that depend on the list being nonempty. Taken from [Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/accessing.20the.20source.20case.20during.20induction/near/502101211). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	40/0	Mathlib/Data/List/Induction.lean	1	5	['eric-wieser', 'github-actions', 'plp127']	nobody	14-25086 14 days ago	14-45645 14 days ago	14-45700 14 days
23681	Timeroot author:Timeroot	feat(Algebra/Polynomial): Descartes' Rule of signs	Proof of Descartes' Rule of Signs. Last PR from https://github.com/Timeroot/lean-descartes-signs , now that #9085 is merged. Defines `Polynomial.SignVariations` as the relevant quantity, and `descartes_rule_of_signs` as the headline theorem. --- I tried to clean it up + golf it down and did shrink it a good deal. The lemma `signvar_mul_eraseLead_le_of_nextCoeff` is still 142 lines, and `succ_sign_lin_mul` is ~140 lines of code as well. Those are the ugly ones. I welcome ideas if someone wants to try to clean them up more! But the proof really does require an annoying bit of case-splitting, as far as I can tell. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	661/3	Mathlib.lean,Mathlib/Algebra/Polynomial/CoeffList.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/RuleOfSigns.lean	5	1	['github-actions']	nobody	14-23570 14 days ago	14-39660 14 days ago	14-39711 14 days
23687	plp127 author:plp127	feat: clopen characterization of connected spaces	Proves that a space is connected iff it contains no nontrivial clopen sets. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	13/0	Mathlib/Topology/Connected/Clopen.lean	1	1	['github-actions']	nobody	14-17659 14 days ago	14-17660 14 days ago	14-17717 14 days
20380	mans0954 author:mans0954	feature(Analysis/NormedSpace/MStructure): The component projections on WithLp 1 (α × β) are L-projections	The component idempotents on `WithLp 1 (α × β)` are L-projections (It's possible to formulate a definition of an `Lᵖ`-projection so that this result would hold for `(p : ℝ≥0∞)` but this would introduce considerable extra complexity so is not considered in this PR.) --- - [ ] depends on: #21899 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	20/1	Mathlib.lean,Mathlib/Analysis/Normed/Lp/MStructure.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean	3	25	['eric-wieser', 'github-actions', 'j-loreaux', 'mans0954', 'mathlib4-dependent-issues-bot']	nobody	14-12792 14 days ago	35-42147 1 month ago	43-49391 43 days
20330	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis 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	14	['YaelDillies', 'alreadydone', 'github-actions', 'j-loreaux', 'kbuzzard', 'mans0954', 'urkud']	nobody	14-12752 14 days ago	67-46851 2 months ago	0-0 0 seconds
19969	mans0954 author:mans0954	WiP: Star Linear Maps and Star Submodules	WiP: Star Linear Maps and Star Submodules --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	1729/0	Mathlib.lean,Mathlib/Algebra/Star/StarLinearMap.lean,Mathlib/Algebra/Star/Submodule.lean	3	1	['github-actions']	nobody	14-12657 14 days ago	125-37835 4 months ago	0-0 0 seconds
14369	mans0954 author:mans0954	feat(Analysis/NormedSpace/MStructure): M-ideals	WiP: Define M-ideals and establish basic properties. --- - [x] depends on: #14458 - [ ] depends on : #20084 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis 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', 'leanprover-community-mathlib4-bot']	nobody	14-12268 14 days ago	unknown	unknown
13918	mans0954 author:mans0954	feat(Topology/Order/HullKernel): Add the Hull-Kernel Topology	Let `α` be a `CompleteLattice` and let `T` be a subset of `α`. The relative `Topology.lower` on `T` takes on a particularly simple form when every element of `T` is `InfPrime` in `α`. In this case, the relative-open sets are exactly the sets of the form `T ↓∩ (Ici a)ᶜ` for some `a` in `α`. The pair of maps `S → ⊓ S` and `a → T ↓∩ Ici a` are often referred to as the kernel and the hull. They form an antitone Galois connection between the subsets of `T` and `α`. When `α` can be generated from `T` by taking infs, this becomes a Galois insertion and the topological closure coincides with the closure arising from the Galois insertion. For this reason the relative lower topology on `T` is often referred to as the hull-kernel topology. The names Jacobson topology and structure topology also occur in the literature. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-topology awaiting-author	302/0	Mathlib.lean,Mathlib/Data/Set/Subset.lean,Mathlib/Topology/Order/HullKernel.lean,docs/references.bib	4	n/a	['YaelDillies', 'github-actions', 'mans0954']	nobody	14-12200 14 days ago	unknown	unknown
23684	alreadydone author:alreadydone	feat(RingTheory): integral extensions of comm. rings are local homs	--- The import increase only affects one file so I hope it's okay. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	57/64	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/SimpleRing/Field.lean	12	4	['alreadydone', 'github-actions', 'xroblot']	nobody	13-84334 13 days ago	14-29332 14 days ago	14-29356 14 days
23669	erdOne author:erdOne	feat(FieldTheory): abelian extensions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	74/0	Mathlib.lean,Mathlib/FieldTheory/Galois/Abelian.lean,Mathlib/NumberTheory/Cyclotomic/Gal.lean	3	4	['alreadydone', 'erdOne', 'github-actions', 'xroblot']	nobody	13-84254 13 days ago	14-60602 14 days ago	14-60601 14 days
18754	FR-vdash-bot author:FR-vdash-bot	feat: `IsometryClass`	--- - [ ] depends on: #18689 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis t-topology	99/3	Mathlib/Analysis/Normed/Group/Uniform.lean,Mathlib/Topology/MetricSpace/Isometry.lean,scripts/nolints_prime_decls.txt	3	2	['github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	13-81994 13 days ago	13-81994 13 days ago	41-34442 41 days
16316	mans0954 author:mans0954	feat(Analysis/Normed/Module/WeakDual): Banach Dieudonné Lemma	WiP attempt to prove a lemma used in the proof of Banach Dieudonné Theorem Current proof is extremely scrappy. References: - Bourbaki TVS IV.24 - Conway, A course in Functional Analysis, 12.1 - Schaefer, p151 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import WIP	390/3	Mathlib/Analysis/LocallyConvex/AbsConvex.lean,Mathlib/Analysis/LocallyConvex/Polar.lean,Mathlib/Analysis/Normed/Module/Dual.lean,Mathlib/Analysis/Normed/Module/WeakDual.lean,Mathlib/Topology/UniformSpace/Cauchy.lean	5	n/a	['github-actions']	nobody	13-78119 13 days ago	unknown	unknown
23231	urkud author:urkud	feat(LinearPMap): more lemmas about `supSpanSingleton`	Also get rid of `erw`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	24/0	Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Span/Defs.lean	2	1	['github-actions']	nobody	13-48811 13 days ago	13-48941 13 days ago	23-18511 23 days
23233	urkud author:urkud	chore(Basis): split `Submodule.exists_le_ker_of_lt_top`	--- - [ ] depends on: #23231 [![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$	43/10	Mathlib/LinearAlgebra/Basis/VectorSpace.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/LinearAlgebra/Span/Defs.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-48409 13 days ago	13-48423 13 days ago	0-211 3 minutes
23360	kim-em author:kim-em	chore: review of `erw` in `Algebra/Homology/DerivedCategory`			21/15	Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/DerivedCategory/SingleTriangle.lean,Mathlib/Algebra/Homology/HomotopyCategory/SingleFunctors.lean,Mathlib/CategoryTheory/Shift/SingleFunctors.lean	5	2	['Ruben-VandeVelde', 'github-actions']	nobody	13-45347 13 days ago	23-14806 23 days ago	23-14792 23 days
15906	grunweg author:grunweg	feat: define singular manifolds	These are used to define bordism groups: the `n`th bordism group of a topological space `X` is the space of cobordism classes of all singular manifolds on `X`. --- This PR can best be seen in context in #23138 - which also proves that this definition is usable. (Older branches in this direction are [this branch](https://github.com/leanprover-community/mathlib4/compare/master...MR-bordism-theory) (my first iteration) and [this one](https://github.com/leanprover-community/mathlib4/compare/master...MR-bordism-theory-v2) (second iteration); #23138 has a bit less progress on the boundary data, but pushes bordisms further. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	255/1	Mathlib.lean,Mathlib/Geometry/Manifold/Bordisms.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean	3	69	['YaelDillies', 'alreadydone', 'github-actions', 'grunweg', 'sgouezel']	sgouezel assignee:sgouezel	13-40427 13 days ago	23-82875 23 days ago	111-47705 111 days
22969	plp127 author:plp127	feat(Order/Filter/Map): add `Sum.elim` lemmas	Adds some `Sum.elim` lemmas for maps and comaps of filters. This will be used in #22137. --- - [ ] depends on: #22964 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order blocked-by-other-PR	94/10	Mathlib/Data/Set/Image.lean,Mathlib/Order/Filter/Map.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	grunweg assignee:grunweg	13-28921 13 days ago	13-28921 13 days ago	0-1269 21 minutes
23715	jsm28 author:jsm28	feat(Geometry/Euclidean/Basic): make `orthogonalProjection` a continuous affine map	Change `EuclideanGeometry.orthogonalProjection` from a bundled `AffineMap` to a bundled `ContinuousAffineMap` (I think I'll end up wanting continuity for some things related to `incenter`). Note 1: I think the new import is reasonable in the context for anything much doing Euclidean geometry / using orthogonal projections, but we'll see from CI how many imports it adds. Note 2: this now means the previous `orthogonalProjection` is a `private` definition `orthogonalProjectionAux`, in order for the continuity proof using `AffineMap.continuous_linear_iff` to work. Is there a better way to refer directly to a structure projection to a parent within the `where` definition without having such an extra definition of the parent structure? I couldn't get it to work without the extra definition. Note 3: the actual motivation is to make `signedDist` a bundled continuous affine map. I've left that change to be done separately (a) to avoid conflicts with #23646 and (b) because I think it will need a few other definitions elsewhere in mathlib to be set up (not everything in the definition of `signedDist` has analogues for `ContinuousAffineMap` at present). Note 4: I think it would be a good idea to refactor orthogonal projections further so there is only one definition, `orthogonalProjection` set up directly as a composition of continuous affine maps (move to vector space via an arbitrary choice of base point, apply the orthogonal projection there, move back to affine space), without needing either `orthogonalProjectionFn` or `orthogonalProjectionAux` (and then `orthogonalProjectionFn` would be deprecated with a view to removal). But that composition also requires a few new definitions not currently in mathlib (including but not limited to `ContinuousAffineEquiv.vaddConst` from #22583). Since we've had `orthogonalProjectionFn` for a long time, I don't think that cleanup is particularly urgent. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-euclidean-geometry	26/10	Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/Geometry/Euclidean/Circumcenter.lean	2	1	['github-actions']	nobody	13-18185 13 days ago	13-18247 13 days ago	13-18233 13 days
21944	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Powerseries): Weierstrass preparation for complete local ring	Weierstrass preparation theorem for complete local ring --- - [x] depends on: #21900 - [x] depends on: #22369 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	532/0	Mathlib.lean,Mathlib/RingTheory/WeierstrassPreparation.lean	2	15	['Thmoas-Guan', 'acmepjz', 'github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	13-9955 13 days ago	48-69376 1 month ago	55-64607 55 days
21859	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Powerseries): Weierstrass preparation	Weierstrass preparation for complete DVR. --- - [x] depends on: #21900 - [ ] depends on: #21944 - [x] depends on: #22369 [![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$	616/0	Mathlib.lean,Mathlib/RingTheory/WeierstrassPreparation.lean	2	10	['Thmoas-Guan', 'github-actions', 'jjdishere', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	13-9925 13 days ago	62-78665 2 months ago	1-8276 1 day
21969	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 is the first of hopefully many PRs upstreaming work that I have done on diffeological spaces in [my orbifolds repo](https://github.com/peabrainiac/lean-orbifolds), containing the first half of `Diffeology/Basic.lean`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry	472/0	Mathlib.lean,Mathlib/Geometry/Diffeology/Basic.lean,docs/references.bib,scripts/noshake.json	4	22	['github-actions', 'grunweg', 'lecopivo', 'peabrainiac']	nobody	13-919 13 days ago	29-82317 29 days ago	11-19972 11 days
23594	YaelDillies author:YaelDillies	refactor: merge `DomMulAct` and `DomAddAct` into `DomAct`	This has several advantages: * Less API surface with a single definition instead of two * Better match the existing `ConjAct` type synonym * We get to use a better name for the multiplication by an element of the type synonym: Previously `dmaSMul`, now `domSMul`. and no inconvenient because the instances for `DomMulAct` and `DomAddAct` are by definition disjoint. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		337/335	Mathlib.lean,Mathlib/Algebra/Group/Translate.lean,Mathlib/Algebra/Module/CharacterModule.lean,Mathlib/Algebra/Module/Hom.lean,Mathlib/Algebra/Module/LinearMap/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/GroupTheory/GroupAction/DomAct/ActionHom.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/GroupTheory/Perm/Centralizer.lean,Mathlib/GroupTheory/Perm/DomAct.lean,Mathlib/MeasureTheory/Function/AEEqFun/DomAct.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/DomAct/Continuous.lean,Mathlib/MeasureTheory/Group/MeasurableEquiv.lean,Mathlib/Topology/Algebra/Constructions/DomAct.lean,Mathlib/Topology/Algebra/Constructions/DomMulAct.lean	16	4	['YaelDillies', 'eric-wieser', 'github-actions', 'urkud']	nobody	12-83075 12 days ago	16-58371 16 days ago	16-58357 16 days
20210	joelriou author:joelriou	feat(AlgebraicTopology): application of the retract argument to model categories	Basic consequences of the retract argument are obtained for model categories: cofibrations are exactly the morphisms that have the left lifting property with respect to trivial fibrations, etc. We deduce various properties of cofibrations, fibrations and weak equivalences in model categories (e.g. they are stable by composition). --- - [x] depends on: #19158 - [x] depends on: #20666 - [x] depends on: #20680 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory WIP	440/4	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean	3	3	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	12-79636 12 days ago	12-79636 12 days ago	0-46563 12 hours
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 awaiting-CI t-meta	57/3	Mathlib/MeasureTheory/Integral/Bochner/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/OuterMeasure/AE.lean,Mathlib/MeasureTheory/OuterMeasure/BorelCantelli.lean	4	15	['YaelDillies', 'eric-wieser', 'github-actions', 'urkud']	nobody	12-75083 12 days ago	12-75096 12 days ago	0-0 0 seconds
21522	riccardobrasca author:riccardobrasca	feat: add Mathlib.RingTheory.DedekindDomain.Instances	We add a new file `Mathlib.RingTheory.DedekindDomain.Instances` containing various instances that are useful to work with the localization a prime of an extension of Dedekind domains. As a practical example we golf a tedious proof in `Mathlib.RingTheory.Ideal/Norm.RelNorm` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra awaiting-author label:t-algebra$	234/42	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/Instances.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/LocalizationLocalization.lean,Mathlib/RingTheory/RingHom/Finite.lean	9	6	['YaelDillies', 'github-actions', 'riccardobrasca']	nobody	12-74236 12 days ago	12-74236 12 days ago	53-158 53 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	190/47	Mathlib/Data/Nat/Find.lean	1	1	['github-actions']	nobody	12-68325 12 days ago	12-68340 12 days ago	13-15811 13 days
22639	b-reinke author:b-reinke	feat(Mathlib/GroupTheory/FreeGroup): theory of (cyclically) reduced words	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. This PR defines in the new file `Mathlib/GroupTheory/FreeGroup/ReducedWords.lean` some extra lemmas for free groups, in particular about (cyclically) reduced words. ## Main declarations * `FreeGroup.Red.reduced`: the predicate for reduced words * `FreeGroup.Red.cyclicallyReduced`: the predicate for cyclically reduced words ## Main statements * `FreeGroup.infinite_order`: nontrivial elements of a free group have infinite order * `FreeGroup.zpow_left_injective`: taking n-th powers is an injective function on the free group Co-authored-by: Amir Livne Bar-on - [ ] depends on: #23366 - [ ] depends on: #23367 - [ ] depends on: #23368 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	429/0	Mathlib.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/FreeGroup/Reduce.lean,Mathlib/GroupTheory/FreeGroup/ReducedWords.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-45585 12 days ago	22-77033 22 days ago	20-75471 20 days
23711	alreadydone author:alreadydone	chore(RingTheory): generalize primeSpectrumProdHomeo to CommSemiring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-algebraic-geometry label:t-algebra$	33/9	Mathlib/RingTheory/Spectrum/Prime/Topology.lean	1	14	['Ruben-VandeVelde', 'alreadydone', 'erdOne', 'github-actions']	nobody	12-33270 12 days ago	12-52342 12 days ago	13-26536 13 days
21965	JovanGerb author:JovanGerb	feat: extensible `push`(_neg) tactic - part 1	This is the first part of #21769, namely defining the new tactic, and only tagging the lemmas that have to be tagged to match the old behaviour. This includes - The `push_neg` tactic, which is a macro for `push Not` - The `push` tactic - The `↓pushNeg` simproc that can be used as `simp [↓pushNeg]` - The `push` and `push_neg` tactics in `conv` mode. - The `#push_discr_tree` command to help see what lemmas the tactic is using for a given constant. There are two new files: `Mathlib.Tactic.Push` and `Mathlib.Tactic.Push.Attr`. The latter only introduces the `@[push]` attribute, so that it can be used by early Mathlib files without having to import `Mathlib.Tactic.Push`. Zulip conversation: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/I.20made.20an.20extensible.20.60push.60.20tactic.20generalizing.20.60push_neg.60/near/499492535 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	310/182	Mathlib.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Push.lean,Mathlib/Tactic/Push/Attr.lean,MathlibTest/push_neg.lean,scripts/noshake.json	9	7	['JovanGerb', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	12-33054 12 days ago	57-72059 1 month ago	60-34826 60 days
21814	mans0954 author:mans0954	feature(LinearAlgebra/QuadraticForm/TensorProduct): Extend `baseChange_ext` to work over a free module	WiP: Extend `baseChange_ext` to work over a free module --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	105/5	Mathlib/LinearAlgebra/Basis/Bilinear.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean	2	1	['github-actions']	nobody	12-6891 12 days ago	65-1533 2 months ago	0-0 0 seconds
18705	mans0954 author:mans0954	feat(Algebra/Module/NestAlgebra): Nest algebras	Nest algebras are an operator analogue of upper triangular matrices. They have been extensively studied in the context of Hilbert spaces, but also in more general contexts. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra awaiting-author 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	8	['github-actions', 'j-loreaux', 'mans0954']	j-loreaux assignee:j-loreaux	12-6579 12 days ago	12-6592 12 days ago	2-67791 2 days
19806	mans0954 author:mans0954	WiP: Expansion of the tensor product of quadratic maps over a linear combination	WiP --- - [ ] depends on: #18578 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-4486 12 days ago	12-6761 12 days ago	0-0 0 seconds
23762	Parcly-Taxel author:Parcly-Taxel	feat: relative upper/lower sets	From a comment by @b-mehta [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/Finset.20sum.20bounds/near/506567011) in response to me formalising IMO 2015 Q6 (#23038).	t-order	171/0	Mathlib.lean,Mathlib/Order/Defs/Unbundled.lean,Mathlib/Order/UpperLower/Relative.lean	3	1	['github-actions']	nobody	12-1877 12 days ago	12-1941 12 days ago	12-1927 12 days
23730	faenuccio author:faenuccio	feat: define valued local fields	Co-authored by: @mariainesdff --- - [ ] depends on: #23725 - [ ] depends on: #23726 - [ ] depends on: #23727	t-algebra t-number-theory blocked-by-other-PR label:t-algebra$	75/0	Mathlib.lean,Mathlib/NumberTheory/LocalField/Valued.lean,docs/references.bib	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-1266 12 days ago	12-1266 12 days ago	0-2 2 seconds
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	11-78681 11 days ago	12-64980 12 days ago	4-80306 4 days
22933	chrisflav author:chrisflav	feat(RingTheory/LocalProperties): constructor for `RingHom.OfLocalizationSpan`	Adds a constructor for `RingHom.OfLocalizationSpan` where `P (algebraMap (Localization.Away r) (Localization.Away r ⊗[R] S))` has to be shown for a covering family. This is convenient in practice, because the base change API is the more generally applicable framework. -- - I think the import increase is fine, but if people are not happy with it, I can instead make a new file `Mathlib.RingTheory.LocalizationAway.BaseChange`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra label:t-algebra$	73/3	Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	3	1	['github-actions']	nobody	11-76785 11 days ago	35-57799 1 month ago	35-57838 35 days
18437	ADedecker author:ADedecker	refactor: add refactored APIs for algebraic filter bases	This is the first part of the refactor of algebraic filter bases discussed [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Refactoring.20algebraic.20filter.20bases/near/479437345). This adds the new APIs without touching any existing file in order to split the work. Please review this by comparing with the existing API! See #18202 for the full picture. --- [![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$	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	21	['ADedecker', 'AntoineChambert-Loir', 'eric-wieser', 'github-actions']	PatrickMassot assignee:PatrickMassot	11-67391 11 days ago	84-11087 2 months ago	75-64682 75 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-algebra label:t-algebra$	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	1	['github-actions']	nobody	11-67092 11 days ago	11-73407 11 days ago	0-0 0 seconds
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	11-65129 11 days ago	11-65129 11 days 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 awaiting-author	29/0	Mathlib/Analysis/Asymptotics/SpecificAsymptotics.lean	1	2	['b-mehta', 'github-actions']	b-mehta assignee:b-mehta	11-64840 11 days ago	21-59317 21 days ago	9-59130 9 days
23752	jsm28 author:jsm28	feat(Geometry/Euclidean/Incenter): incenters and excenters	Define the exspheres and insphere of a simplex (in dimension 1 and greater), and corresponding definitions for their center and radius. Give necessary and sufficient conditions for them to exist (in terms of the barycentric coordinates, being signed versions of the inverses of the distances between vertices and opposite faces, having a nonzero sum) and show that they do always exist in the case of the incenter and of the excenter opposite a single vertex (the latter in dimensions 2 and greater), and that any point lying in the span of the vertices and equidistant from the faces opposite the vertices is an excenter (and, when signs of the equal distances are given, is the excenter with corresponding signs). Some major pieces are deferred to followups, in particular definitions of touchpoints, tangency of exspheres and insphere to faces, and the relation to angle bisectors in various forms. But since the file is already over 600 lines, I think this is a reasonable starting point (and since the lemmas do show that the definitions have their characteristic properties of points being equidistant from the faces on the desired sides, I think it sufficiently justifies that the definitions are correct and usable as-is). Feel free to golf; the calculations involved in showing that the excenter opposite a vertex always exists (in dimensions 2 and greater) are rather long. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [x] depends on: #23712 - [x] depends on: #23751	t-euclidean-geometry	620/0	Mathlib.lean,Mathlib/Geometry/Euclidean/Incenter.lean	2	7	['eric-wieser', 'github-actions', 'jsm28', 'mathlib4-dependent-issues-bot']	nobody	11-64671 11 days ago	12-2319 12 days ago	12-2875 12 days
23506	Timeroot author:Timeroot	feat (ModelTheory/Definability): TermDefinable functions	Defines `TermDefinable` functions, as functions that can be expressed directly as a term in some interpretation of a language. Shows that this is transitive (as a relationship between structures) and closed under composition of functions. --- Pulled out from #19695. - [x] depends on: #23501 - [ ] depends on: #23502 - [ ] depends on: #23504 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic blocked-by-other-PR	191/0	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean,scripts/noshake.json	5	6	['Timeroot', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	11-62547 11 days ago	13-4971 13 days ago	2-32155 2 days
23504	Timeroot author:Timeroot	feat(ModelTheory/Syntax): substFunc	Defines `FirstOrder.Language.Term.substFunc`, a way to substitute function definitions inside of a term. Compare this with existing `subst`, which just substitutes variables. --- Pulled out from #19695 - [ ] depends on: #23502 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic blocked-by-other-PR	33/0	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-61746 11 days ago	11-61748 11 days ago	6-84007 6 days
23790	vasnesterov author:vasnesterov	feat(Analysis/Analytic): `HasFPowerSeriesOnBall.compContinuousLinearMap`	Prove `HasFPowerSeriesOnBall.compContinuousLinearMap` and its variants: if `pf` converges to `f` on the ball `B(u x0, r)` where `u` is continuous linear function, then `pf.compContinuousLinearMap u` converges to `f ∘ u` on `B(x0, r / ‖u‖)`. --- - [ ] depends on: #22531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis blocked-by-other-PR	216/6	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,scripts/noshake.json	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-59105 11 days ago	11-59118 11 days ago	0-1519 25 minutes
23732	jsm28 author:jsm28	feat(LinearAlgebra/AffineSpace/ContinuousAffineEquiv): `toContinuousAffineMap`	Add the conversion from `ContinuousAffineEquiv` to `ContinuousAffineMap`, which seems to be missing from mathlib. I'm not sure exactly what API such conversions are meant to have - `toHomeomorph` doesn't have any - but I added `rfl` lemmas about converting to a function either directly or via `toContinuousAffineMap`, and about different pairs of conversion paths involving `toContinuousAffineMap` producing the same result, as well as injectivity of `toContinuousAffineMap`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-topology label:t-algebra$	34/0	Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean	1	3	['eric-wieser', 'github-actions', 'jsm28']	nobody	11-57280 11 days ago	12-55986 12 days ago	12-55972 12 days
23797	joelriou author:joelriou	feat(CategoryTheory/Abelian): Ext when there are enough injectives	In this PR, it is shown that `Ext`-groups of positive degree to an injective object vanish. It follows that if `C` is a `w`-small abelian category with enough injectives, then `Ext`-groups are `w`-small (i.e. `HasExt.{w}` holds). This PR dualizes the results in #19591. --- - [ ] depends on: #19591 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	378/14	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/HasEnoughInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/HasEnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/SingleHomology.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean,Mathlib/CategoryTheory/Preadditive/Injective/Basic.lean	8	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-55159 11 days ago	unknown	unknown
22415	pechersky author:pechersky	feat(Algebra/Order/Hom/Monoid): order iso versions of unitsWithZero and friends	--- - [ ] depends on: #22402 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/15	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-49307 11 days ago	11-55319 11 days ago	11-55554 11 days
22420	pechersky author:pechersky	feat(Order/Prod/Lex/{Hom,Monoid,GroupWithZero}): ordered inclusions and projections of prod of ordered groups	--- - [ ] depends on: #22402 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-algebra label:t-algebra$	256/0	Mathlib.lean,Mathlib/Order/Prod/Lex/GroupWithZero.lean,Mathlib/Order/Prod/Lex/Hom.lean,Mathlib/Order/Prod/Lex/Monoid.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	11-49281 11 days ago	11-55320 11 days ago	11-57115 11 days
19432	mans0954 author:mans0954	feat(LinearAlgebra/QuadraticForm/Basis): Free Tensor product of Quadratic Maps	WiP: Define the tensor product of two Quadratic Maps on free modules using `toBilin`. It should then be possible to extend this definition to arbitrary modules using quotients. Similar to `QuadraticMap.tensorDistrib` but without requiring `Invertible (2 : R)`. --- - [x] depends on: #18578 - [x] depends on: #19712 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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', 'mathlib4-dependent-issues-bot']	nobody	11-38821 11 days ago	unknown	unknown
23507	CBirkbeck author:CBirkbeck	SummableUniformlyOn	Testing some defs/API for summableUniformlyOn --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology WIP	128/0	Mathlib.lean,Mathlib/Topology/Algebra/InfiniteSum/UniformOn.lean	2	1	['github-actions']	nobody	11-38227 11 days ago	18-52291 18 days ago	0-0 0 seconds
23804	hanwenzhu author:hanwenzhu	feat(Analysis/SpecialFunctions): extend `tendsto_one_plus_div_rpow_exp`	This PR - Proves 12 theorems (they are stated separately because of differences in `rexp` vs `cexp` and `pow` vs `rpow` vs `cpow`): - The limit of `x * log (1 + t/x + o(1/x))` as `x → ∞` is `t` for `t : ℂ` or `ℝ` and `x : ℝ` or `ℕ`. - The limit of `(1 + t/x + o(1/x)) ^ x` as `x → ∞` is `t` for `t : ℂ` or `ℝ` and `x : ℝ` or `ℕ`. - The limit of `(1 + t/x) ^ x` as `x → ∞` is `t` for `t : ℂ` or `ℝ` and `x : ℝ` or `ℕ`. - (Note: the last row of theorems for `t : ℝ` already exist and are now replaced) - Renames `plus` to `add` in affected theorems The little-o theorem for `t : ℂ` is needed for [CLT](https://github.com/RemyDegenne/CLT). Moves: - tendsto_one_plus_div_rpow_exp -> Real.tendsto_one_add_div_rpow_exp - tendsto_one_plus_div_pow_exp -> Real.tendsto_one_add_div_pow_exp - tendsto_integral_mul_one_plus_inv_smul_sq_pow -> tendsto_integral_mul_one_add_inv_smul_sq_pow --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	187/41	Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean	5	1	['github-actions']	nobody	11-33222 11 days ago	11-33645 11 days ago	11-33631 11 days
23756	urkud author:urkud	feat(Asymptotics): define `IsBigOTVS`	- Turn `IsLittleOTVS` into a 1-field `structure`. We may want to replace the definition with "the ratio of `egauge`s tends to zero". In `ENNReal`, it's the right definition. - Define `IsBigOTVS`, prove basic API lemmas. - Prove lemmas about `IsLittleOTVS` in (indexed) products. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	208/59	Mathlib/Analysis/Asymptotics/TVS.lean	1	6	['eric-wieser', 'github-actions', 'urkud']	nobody	11-18668 11 days ago	11-18720 11 days ago	11-63447 11 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	11-11250 11 days ago	11-11250 11 days ago	51-9403 51 days
23690	mbkybky author:mbkybky	refactor(Algebra/Category/ModuleCat): generalize the universe of `ModuleCat.enoughProjectives`	Generalize the universe in the statement of `ModuleCat.enoughProjectives` and `ModuleCat.enoughInjectives`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/39	Mathlib/Algebra/Category/ModuleCat/EnoughInjectives.lean,Mathlib/Algebra/Category/ModuleCat/Projective.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,scripts/nolints_prime_decls.txt	5	1	['github-actions']	nobody	11-9951 11 days ago	13-81256 13 days ago	13-81309 13 days
22365	euprunin author:euprunin	feat: register more tactics for `hint`	The following example shows test cases that `hint` now supports, which were unsupported prior to this PR: ``` import Mathlib -- The tactics registered in this PR register_hint abel register_hint bound register_hint group register_hint noncomm_ring register_hint norm_num register_hint positivity register_hint ring -- "hint" now correctly suggests "abel" which closes the goal (no closing tactic suggested prior to this PR) example {α} [AddCommMonoid α] (a b c d: α) : a + b + c + d + 0 = d + (c + b) + (0 + 0 + a) := by hint -- "hint" now correctly suggests "bound" which closes the goal (no closing tactic suggested prior to this PR) example (a b : ℝ) (h1 : ‖a‖ ≤ ‖b‖) (h2 : 3 ≤ ‖b‖) : ‖b ^ 2 + a‖ ≥ ‖b ^ 2‖ - ‖a‖ ∧ ‖b ^ 2‖ - ‖a‖ ≥ ‖b ^ 2‖ - ‖b‖ ∧ (‖b‖ - 1) * ‖b‖ ≥ 2 * ‖b‖ := by hint -- "hint" now correctly suggests "group" which closes the goal (no closing tactic suggested prior to this PR) example (G : Type) (a b c : G) [Group G] : c⁻¹ * (b * c⁻¹) * c * (a * b) * (b⁻¹ * a⁻¹ * b⁻¹) * c = 1 := by hint -- "hint" now correctly suggests "noncomm_ring" which closes the goal (no closing tactic suggested prior to this PR) example (R : Type) (a b : R) [Ring R] : (a + b) ^ 3 = a ^ 3 + a ^ 2 * b + a * b * a + a * b ^ 2 + b * a ^ 2 + b * a * b + b ^ 2 * a + b ^ 3 := by hint -- "hint" now correctly suggests "norm_num" which closes the goal (no closing tactic suggested prior to this PR) example : (2 : ℝ) < 5 / 2 ∧ 5 / 2 < 3 := by hint -- "hint" now correctly suggests "positivity" which closes the goal (no closing tactic suggested prior to this PR) example (a : ℤ) : 0 < \|a\| + 3 := by hint -- "hint" now correctly suggests "ring" which closes the goal (no closing tactic suggested prior to this PR) example (α : Type) (a b c : α) [LinearOrderedField α] : a * (-c / b) * (-c / b) + -c + c = a * (c / b * (c / b)) := by hint ```	t-meta	60/1	Mathlib/Tactic/Abel.lean,Mathlib/Tactic/Bound.lean,Mathlib/Tactic/Group.lean,Mathlib/Tactic/NoncommRing.lean,Mathlib/Tactic/NormNum.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring.lean,MathlibTest/hint.lean	8	6	['euprunin', 'github-actions', 'j-loreaux']	nobody	11-5680 11 days ago	11-5680 11 days ago	12-45887 12 days
23365	vasnesterov author:vasnesterov	feat(Tactic/Simproc): nested quantifiers in `existsAndEq`	Generalize the `existsAndEq` simproc to nested existential quantifiers. For example `∃ a, p a ∧ ∃ b, a = f b ∧ q b` now simplifies to `∃ b, p (f b) ∧ q b`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	440/73	Mathlib/Tactic/Simproc/ExistsAndEq.lean,MathlibTest/Simproc/ExistsAndEq.lean	2	40	['JovanGerb', 'b-mehta', 'eric-wieser', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vasnesterov']	nobody	11-2031 11 days ago	16-31175 16 days ago	21-57820 21 days
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	231/89	Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	2	1	['github-actions']	nobody	11-628 11 days ago	11-628 11 days ago	11-684 11 days
23779	joelriou author:joelriou	feat(CategoryTheory/Center): localization	A localization functor `L : C ⥤ D` with respect to `W : MorphismProperty C` induces a map `CatCenter C → CatCenter D` which is multiplicative (and even a ring morphism when `L` is an additive functor between preadditive categories). --- - [ ] depends on: #23777 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	179/0	Mathlib.lean,Mathlib/CategoryTheory/Center/Basic.lean,Mathlib/CategoryTheory/Center/Localization.lean,Mathlib/CategoryTheory/Localization/Preadditive.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-83936 10 days ago	11-67725 11 days 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/)	maintainer-merge 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	10-83852 10 days ago	11-16285 11 days ago	54-54882 54 days
23815	joelriou author:joelriou	feat(CategoryTheory/Center): linear structures and ring morphisms	If `C` is a category and `R` a ring, we relate `R`-linear structures on `C` and ring morphisms `R →+* CatCenter C`. --- - [ ] depends on: #23777 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	159/0	Mathlib.lean,Mathlib/CategoryTheory/Center/Basic.lean,Mathlib/CategoryTheory/Center/Linear.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-82210 10 days ago	10-82211 10 days ago	0-1023 17 minutes
23252	mariainesdff author:mariainesdff	feat(Algebra/Polynomial): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	49/1	Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Monic.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/Splits.lean	7	8	['alreadydone', 'github-actions', 'mariainesdff']	nobody	10-63580 10 days ago	16-61597 16 days ago	25-69829 25 days
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	86/0	Mathlib/Combinatorics/SimpleGraph/Acyclic.lean	1	6	['Rida-Hamadani', 'b-mehta', 'github-actions', 'grunweg']	b-mehta assignee:b-mehta	10-63307 10 days ago	10-63328 10 days ago	32-54009 32 days
22018	maddycrim author:maddycrim	feat(RingTheory/Localization/Pi): localization of a finite direct product where each semiring in product has maximal nilradical is a projection	For noncomputable def `surjectivePiNilradicalIsMaximal` : Let `M` be a submonoid of a direct product of commutative rings `R i`. If each `R i` has maximal nilradical then the direct product `∏ R i` surjects onto the localization of `∏ R i` at `M`. --- [![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$	28/0	Mathlib/RingTheory/Localization/Pi.lean	1	24	['Paul-Lez', 'alreadydone', 'erdOne', 'github-actions', 'grunweg', 'jcommelin', 'maddycrim']	nobody	10-61153 10 days ago	12-56221 12 days ago	59-43050 59 days
18306	bjoernkjoshanssen author:bjoernkjoshanssen	feat(Topology/Compactification): projective line over ℝ is homeomorphic to the one-point compactification of ℝ	ℙ ℝ (Fin 2 → ℝ) and OnePoint ℝ are homeomorphic: the projective line over ℝ is homeomorphic to the one-point compactification of ℝ. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	922/0	Mathlib.lean,Mathlib/Topology/Compactification/OnePointHomeomorph.lean,Mathlib/Topology/Compactification/OnePointRealLemmas.lean	3	10	['bjoernkjoshanssen', 'github-actions', 'leanprover-community-bot-assistant', 'ocfnash']	nobody	10-57353 10 days ago	10-57567 10 days ago	3-38897 3 days
23838	FordUniver author:FordUniver	feat(SimpleGraph): added completeGraph.adjDecidable	added completeGraph.adjDecidable --- Strangely `DecidableRel (completeGraph V).Adj` does not seem to be automatically inferred from `Top.adjDecidable` even though `⊤ : SimpleGraph V` is defined as `completeGraph V`. Am I missing something here or is it as simple as adding these two lines to mathlib?	new-contributor t-combinatorics	4/1	Mathlib/Combinatorics/SimpleGraph/Basic.lean	1	8	['FordUniver', 'YaelDillies', 'github-actions']	nobody	10-45618 10 days ago	10-56594 10 days ago	10-56648 10 days
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	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	29	['YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	10-42934 10 days ago	11-57343 11 days ago	12-17822 12 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 awaiting-author	9/0	Mathlib/Data/Finset/Defs.lean,Mathlib/Data/Set/Basic.lean	2	2	['Ruben-VandeVelde', 'github-actions']	nobody	10-41415 10 days ago	10-41415 10 days ago	28-17347 28 days
18711	bjoernkjoshanssen author:bjoernkjoshanssen	feat: One-point compactification of Euclidean space homeomorphic to sphere	The one-point compactification of n-dimensional Euclidean space is homeomorphic to the n-sphere. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	117/6	Mathlib.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Topology/Category/LightProfinite/Sequence.lean,Mathlib/Topology/Compactification/OnePoint/Basic.lean,Mathlib/Topology/Compactification/OnePoint/OnePointEquiv.lean,Mathlib/Topology/Compactification/OnePoint/Sphere.lean,Mathlib/Topology/Compactness/CompactlyGeneratedSpace.lean,Mathlib/Topology/Instances/RatLemmas.lean	10	35	['bjoernkjoshanssen', 'github-actions', 'jcommelin', 'ocfnash']	ocfnash assignee:ocfnash	10-38662 10 days ago	10-54667 10 days ago	66-992 66 days
20897	yuma-mizuno author:yuma-mizuno	feat(CategoryTheory/Bicategory): add lemmas about mates in bicategories	Continued from #20891. This PR completes the bicategorical proofs for the lemmas whose Cat versions are provided in `Mathlib/CategoryTheory/Adjunction/Mates.lean`. --- - [x] depends on: #20891 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	366/0	Mathlib/CategoryTheory/Bicategory/Adjunction/Mate.lean	1	6	['github-actions', 'joelriou', 'kim-em', 'mathlib4-dependent-issues-bot', 'yuma-mizuno']	nobody	10-35798 10 days ago	10-35798 10 days ago	32-70765 32 days
23849	chrisflav author:chrisflav	feat(Data/Set): add `Set.encard_iUnion`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data	61/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Finite/Lattice.lean	3	1	['github-actions']	nobody	10-32277 10 days ago	10-32284 10 days ago	10-32328 10 days
23835	chrisflav author:chrisflav	feat(Topology): cardinality of connected components is bounded by cardinality of fiber	--- - [ ] depends on: #23849 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-topology blocked-by-other-PR	302/1	Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Card/Arithmetic.lean,Mathlib/Data/Set/Finite/Lattice.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	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	10-31195 10 days ago	10-31197 10 days ago	0-498 8 minutes
21539	Raph-DG author:Raph-DG	feat(LinearAlgebra): Symmetric Algebra	Defined the universal property for the symmetric algebra of a module over a commutative ring, provided an explicit construction and proved that this satisfies the universal property. Also proved that the multivariate polynomial ring generated by a basis of a module satisfies the universal property of the symmetric algebra of that module. Co-authored-by: Zhixuan Dai <22300180006@m.fudan.edu.cn> Co-authored-by: Zhenyan Fu Co-authored-by: Yiming Fu Co-authored-by: Wang Jingting --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge new-contributor t-algebra label:t-algebra$	223/0	Mathlib.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/Basic.lean,Mathlib/LinearAlgebra/SymmetricAlgebra/MvPolynomial.lean	4	47	['ADedecker', 'Raph-DG', 'YaelDillies', 'eric-wieser', 'github-actions', 'xyzw12345']	nobody	10-27479 10 days ago	10-85713 10 days ago	66-57308 66 days
23320	Whysoserioushah author:Whysoserioushah	feat(Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum): span of set as finsum	co-authored by: @jjaassoonn splited from [#23216](https://github.com/leanprover-community/mathlib4/pull/23216) following @eric-wieser advice --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	81/0	Mathlib.lean,Mathlib/RingTheory/TwoSidedIdeal/SpanAsSum.lean	2	42	['Paul-Lez', 'Whysoserioushah', 'eric-wieser', 'github-actions', 'kbuzzard']	nobody	10-26654 10 days ago	24-30597 24 days ago	24-30645 24 days
18266	bjoernkjoshanssen author:bjoernkjoshanssen	feat: Second-derivative test from calculus	We prove the Second-Derivative test from calculus using the First-Derivative test. Source: [Wikipedia](https://en.wikipedia.org/wiki/Derivative_test#Proof_of_the_second-derivative_test). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	149/0	Mathlib.lean,Mathlib/Analysis/Calculus/SecondDerivativeTest.lean	2	37	['bjoernkjoshanssen', 'eric-wieser', 'fpvandoorn', 'github-actions', 'j-loreaux']	nobody	10-26224 10 days ago	10-26224 10 days ago	62-5809 62 days
23154	vlad902 author:vlad902	feat(Algebra/FreeMonoid): isomorphisms for the free monoid on zero/one generators	In parallel to FreeGroup.freeGroupEmptyEquivUnit and FreeGroup.freeGroupUnitEquivInt, prove that the free monoid on zero/one generators is isomorphic to Unit/ℕ.	t-algebra awaiting-author label:t-algebra$	18/0	Mathlib/Algebra/FreeMonoid/Basic.lean	1	2	['github-actions', 'urkud']	nobody	10-21951 10 days ago	10-21951 10 days ago	19-35867 19 days
23459	Timeroot author:Timeroot	feat: Definition of `Clone` notations and typeclasses	Definitions and notation typeclasses for #20051 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	84/0	Mathlib.lean,Mathlib/Algebra/Clone/Defs.lean	2	17	['Timeroot', 'YaelDillies', 'eric-wieser', 'github-actions', 'urkud']	YaelDillies assignee:YaelDillies	10-21147 10 days ago	11-60893 11 days ago	14-23599 14 days
23381	vlad902 author:vlad902	feat: copy Subgroup lemma for Submonoid	This is an exact copy of `Subgroup.map_top_of_surjective`, copied for Submonoid.	t-algebra label:t-algebra$	8/0	Mathlib/Algebra/Group/Submonoid/Operations.lean	1	5	['eric-wieser', 'github-actions', 'urkud', 'vlad902']	nobody	10-20148 10 days ago	22-43927 22 days ago	22-44209 22 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)`. From MiscYD --- 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$	269/1	Mathlib.lean,Mathlib/Algebra/Order/Floor/Extended.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Data/Int/CardIntervalMod.lean	4	17	['YaelDillies', 'eric-wieser', 'github-actions', 'urkud']	nobody	10-8084 10 days ago	13-53534 13 days ago	25-22768 25 days
22961	xroblot author:xroblot	feat(ZLattice/Covolume): add `covolume_div_covolume_eq_relindex`	Add the following result: Let `L₁` be a sub-`ℤ`-lattice of `L₂`. Then the index of `L₁` inside `L₂` is equal to `covolume L₁ / covolume L₂`. --- - [x] depends on: #22940 - [x] depends on: #23759 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	64/1	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Determinant.lean	4	8	['Ruben-VandeVelde', 'github-actions', 'mathlib4-dependent-issues-bot', 'xroblot']	nobody	10-6962 10 days ago	10-8683 10 days ago	32-6248 32 days
23705	YaelDillies author:YaelDillies	chore: move `Module.End`-related decls to the `Module.End` namespace	No deprecations, since they would clash across namespaces. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	314/328	Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Algebra/Bilinear.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Lie/CartanExists.lean,Mathlib/Algebra/Lie/Derivation/Basic.lean,Mathlib/Algebra/Lie/Engel.lean,Mathlib/Algebra/Lie/EngelSubalgebra.lean,Mathlib/Algebra/Lie/LieTheorem.lean,Mathlib/Algebra/Lie/Nilpotent.lean,Mathlib/Algebra/Lie/OfAssociative.lean,Mathlib/Algebra/Lie/Sl2.lean,Mathlib/Algebra/Lie/TraceForm.lean,Mathlib/Algebra/Lie/Weights/Basic.lean,Mathlib/Algebra/Lie/Weights/Cartan.lean,Mathlib/Algebra/Lie/Weights/Chain.lean,Mathlib/Algebra/Lie/Weights/Killing.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/Algebra/Module/LocalizedModule/Submodule.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/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/AlgebraicGeometry/Modules/Tilde.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/Analysis/InnerProductSpace/Adjoint.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Data/Matrix/Bilinear.lean,Mathlib/FieldTheory/JacobsonNoether.lean,Mathlib/LinearAlgebra/Charpoly/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Basic.lean,Mathlib/LinearAlgebra/Eigenspace/Minpoly.lean,Mathlib/LinearAlgebra/Eigenspace/Pi.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean,Mathlib/LinearAlgebra/Matrix/InvariantBasisNumber.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/Quotient/Basic.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Hom.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Basic.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean,Mathlib/RingTheory/Artinian/Module.lean,Mathlib/RingTheory/CotangentLocalizationAway.lean,Mathlib/RingTheory/Derivation/Lie.lean,Mathlib/RingTheory/Finiteness/Nilpotent.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Kaehler/TensorProduct.lean,Mathlib/RingTheory/LocalProperties/Projective.lean,Mathlib/RingTheory/Localization/Algebra.lean,Mathlib/RingTheory/Nilpotent/Exp.lean,Mathlib/RingTheory/Nilpotent/Lemmas.lean,Mathlib/RingTheory/Noetherian/Defs.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/RingTheory/Polynomial/Bernstein.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	75	4	['github-actions', 'urkud']	nobody	10-5097 10 days ago	10-7015 10 days ago	13-40217 13 days
23748	vasnesterov author:vasnesterov	feat(Analysis/Analytic): `HasFPowerSeriesOnBall.comp_sub` variations	Prove `HasFPowerSeriesOnBall.comp_sub` variations for `HasFPowerSeriesOnBall`'s friend structures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	52/0	Mathlib/Analysis/Analytic/Basic.lean	1	4	['github-actions', 'urkud', 'vasnesterov']	nobody	10-141 10 days ago	12-29447 12 days ago	12-29523 12 days
22474	joelriou author:joelriou	feat(CategoryTheory/Functor): more API for pointwise Kan extensions	Transport pointwise Kan extensions via isomorphisms/equivalences. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	157/7	Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean	4	1	['github-actions']	nobody	9-82923 9 days ago	46-386 1 month ago	47-30661 47 days
22490	joelriou author:joelriou	feat(CategoryTheory/Functor): pointwise right derived functors	--- - [ ] depends on: #22474 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR	317/7	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-82877 9 days ago	9-82892 9 days ago	0-2040 34 minutes
22508	joelriou author:joelriou	feat(CategoryTheory): existence of right derived functors using derivability structures	In this PR, we formalize an existence theorem for right derived functors which appeared in the article Structures de dérivabilité by Bruno Kahn and Georges Maltsiniotis, Adv. Math. 218 (2008). --- - [ ] depends on: #22474 - [ ] depends on: #22490 - [x] depends on: #22514 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	480/9	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/PointwiseRightDerived.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-82791 9 days ago	45-55125 1 month 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/)		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	14	['FR-vdash-bot', 'digama0', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	digama0 assignee:digama0	9-73976 9 days ago	10-5705 10 days ago	73-81392 73 days
23364	joelriou author:joelriou	refactor(CategoryTheory/Limits): colimits in Type	--- - [x] depends on: #23346 - [ ] depends on: #23339 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	717/364	Mathlib.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/IsConnected.lean,Mathlib/CategoryTheory/Limits/Preserves/Ulift.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/Types.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-70588 9 days ago	9-70606 9 days ago	0-0 0 seconds
23236	alreadydone author:alreadydone	chore(Topology/Instances/AddCircle): golf and little lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	44/37	Mathlib/Topology/Instances/AddCircle.lean	1	6	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	9-65461 9 days ago	9-65478 9 days ago	26-52497 26 days
21237	scholzhannah author:scholzhannah	feat: a weaker definition of compactly generated spaces	This PR defines compactly generated spaces as a topological space where a set is open iff its intersection with every compact set is open in that compact set. There is a [definition of compactly generated spaces already in mathlib](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Compactness/CompactlyGeneratedSpace.html#CompactlyGeneratedSpace) but that definition is stronger than the one presented here. They do however agree on Hausdorff spaces. See [this wikipedia page](https://en.wikipedia.org/wiki/Compactly_generated_space) for an explanation for the three different definitions of compactly generated spaces used in literature. Co-authored-by: Floris van Doorn --- See also [this discussion on Zulip](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/Compactly.20generated.20spaces) about compactly generated spaces. - [x] depends on: #21134 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	332/0	Mathlib.lean,Mathlib/Topology/Compactness/KSpace.lean,docs/references.bib	3	15	['StevenClontz', 'github-actions', 'jzxia', 'mathlib4-dependent-issues-bot', 'scholzhannah', 'urkud']	nobody	9-58181 9 days ago	9-71403 9 days ago	51-23496 51 days
15412	mans0954 author:mans0954	feature(Order/ScottContinuity): Scott Continuity on product spaces	WIP - Scott Continuity on the product space --- - [x] depends on: #13201 - I think this is due to the move of the definition of Scott Continuity into its own file rather than a hard dependency. - [x] depends on: #19150 - [x] depends on: #19222 - [x] depends on:#20254 - [ ] depends on: #21493 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order blocked-by-other-PR WIP	197/3	Mathlib/Data/Set/Prod.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Image.lean,Mathlib/Order/Directed.lean,Mathlib/Order/ScottContinuity.lean	5	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	9-52450 9 days ago	unknown	unknown
23866	kim-em author:kim-em	chore: remove `[AtLeastTwo n]` hypothesis from the `NatCast` to `OfNat` instance	This PR observes that we can change ``` instance (priority := 100) instOfNatAtLeastTwo {n : ℕ} [NatCast R] [Nat.AtLeastTwo n] : OfNat R n ``` to ``` instance (priority := 100) instOfNatAtLeastTwo {n : ℕ} [NatCast R] : OfNat R n ``` with minimal fall-out. A follow-up PR #23867 then observes that we can remove nearly all the `[Nat.AtLeastTwo n]` hypotheses in Mathlib. This is slightly dangerous -- it does make it more likely that we'll generate non-defeq instances, but it appears to happen very rarely. However, it will make life slightly easier for something Leo and I are trying to do with `grind` and Grobner bases (we'd like to be able to assume types we consume have `[∀ n, OfNat α n]`, which is possible with this change, but not without...). Zulip thread: [#PR reviews > #23866 and #23867, removing most `[Nat.AtLeastTwo n]` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2323866.20and.20.2323867.2C.20removing.20most.20.60.5BNat.2EAtLeastTwo.20n.5D.60/near/511157297)	awaiting-zulip	21/26	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean	3	3	['eric-wieser', 'github-actions', 'urkud']	nobody	9-47563 9 days ago	9-47652 9 days ago	0-23929 6 hours
23890	erdOne author:erdOne	refactor(AlgebraicGeometry): add `supportSet` field to `IdealSheafData`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	280/169	Mathlib/AlgebraicGeometry/IdealSheaf.lean,Mathlib/AlgebraicGeometry/Scheme.lean	2	1	['github-actions']	nobody	9-40129 9 days ago	9-40798 9 days ago	9-40851 9 days
23648	wwylele author:wwylele	feat(Topology/Order): add `Dense.exists_seq_strict{Mono/Anti}_tendsto`	Add `Dense.exists_seq_strict{Mono/Anti}_tendsto{'}` that restricts the sequence to a dense subset. This is useful for e.g. finding a monotone rational sequence approaching a real number. Co-authored-by: Jireh Loreaux --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	62/0	Mathlib/Topology/Instances/Real/Lemmas.lean,Mathlib/Topology/Order/IsLUB.lean	2	10	['github-actions', 'j-loreaux', 'wwylele']	nobody	9-14841 9 days ago	13-47375 13 days ago	15-16937 15 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 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	24	['YaelDillies', 'adomani', 'github-actions', 'grunweg', 'joneugster', 'kim-em']	nobody	8-83071 8 days ago	12-4837 12 days ago	82-54712 82 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	255/1	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	17	['Ruben-VandeVelde', 'erdOne', 'github-actions', 'xroblot']	nobody	8-78571 8 days ago	19-38234 19 days ago	20-40754 20 days
23913	kebekus author:kebekus	feat: introduce factorized rational functions	Discuss functions `𝕜 → 𝕜` of the form `∏ᶠ u, (· - u) ^ d u`, where `d : 𝕜 → ℤ` is integer-valued. Show that these "factorized rational functions" are meromorphic in normal form, with divisor equal to `d`. Factorized rational functions will be used in a follow-up PR to extract poles and zeros from meromorphic functions. This, in turn, will be useful to show prove integrability of functions of type log \|meromorphic\| that frequently appear in complex analysis. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	170/2	Mathlib.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Meromorphic/FactorizedRational.lean	3	2	['github-actions', 'kebekus']	nobody	8-74475 8 days ago	8-75184 8 days ago	8-75245 8 days
23063	xroblot author:xroblot	feat(ZLattice): add `Real.finrank_eq_int_finrank_of_discrete`	Prove the following result: ```lean theorem Real.finrank_eq_int_finrank_of_discrete {E : Type*} [NormedAddCommGroup E] [NormedSpace ℝ E] [FiniteDimensional ℝ E] {s : Set E} (hs : DiscreteTopology (span ℤ s)) : Set.finrank ℝ s = Set.finrank ℤ s ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	39/0	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/Topology/Homeomorph/Defs.lean	3	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	8-73763 8 days ago	8-73780 8 days ago	31-32739 31 days
22823	b-reinke author:b-reinke	feat(Algebra/Ring): associator of a non-associative ring	If `R` is a non-associative ring, then `(x * y) * z - x * (y * z)` is called the `associator` of ring elements `x y z : R`. The associator vanishes exactly when `R` is associative. We prove variants of this statement also for the `AddMonoidHom` bundled version of the associator, as well as the bundled version of `mulLeft₃` and `mulRight₃`, the multiplications `(x * y) * z` and `x * (y * z)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge new-contributor t-algebra label:t-algebra$	133/8	Mathlib.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Ring/Associator.lean	3	46	['Paul-Lez', 'YaelDillies', 'b-reinke', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant']	nobody	8-73625 8 days ago	8-81162 8 days ago	32-56111 32 days
23472	erdOne author:erdOne	feat(Topology): Continuous open maps with irreducible fibers induce bijections between irreducible components	Co-authored-by: Christian Merten --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	77/0	Mathlib/Topology/Irreducible.lean	1	3	['ADedecker', 'erdOne', 'github-actions']	nobody	8-72477 8 days ago	19-14962 19 days ago	19-15008 19 days
23777	joelriou author:joelriou	feat(CategoryTheory): the center of a category	This PR introduces an abbrevation `CatCenter C` for the center of a category `C`, i.e. the type of endomorphisms of the identity functor of `C`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	53/0	Mathlib.lean,Mathlib/CategoryTheory/Center/Basic.lean	2	1	['github-actions']	nobody	8-71901 8 days ago	8-71901 8 days ago	11-60780 11 days
23513	erdOne author:erdOne	feat(AlgebraicGeometry): subscheme associated to an ideal sheaf	--- - [ ] depends on: #23890 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry awaiting-author blocked-by-other-PR	621/180	Mathlib/AlgebraicGeometry/IdealSheaf.lean,Mathlib/AlgebraicGeometry/Morphisms/ClosedImmersion.lean,Mathlib/AlgebraicGeometry/Morphisms/Separated.lean,Mathlib/AlgebraicGeometry/Scheme.lean	4	17	['Paul-Lez', 'chrisflav', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-71292 8 days ago	8-71295 8 days ago	6-43475 6 days
19796	peakpoint author:peakpoint	feat: Peano form of Taylor's theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	329/19	Mathlib/Algebra/Polynomial/Module/Basic.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Geometry/Manifold/Instances/Real.lean,Mathlib/Order/Interval/Set/Basic.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean	9	13	['RemyDegenne', 'github-actions', 'peakpoint', 'sgouezel']	sgouezel assignee:sgouezel	8-71259 8 days ago	8-74130 8 days ago	33-36705 33 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	92/1	Mathlib/Analysis/Calculus/Deriv/Basic.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/Taylor.lean	3	10	['Paul-Lez', 'github-actions', 'grunweg']	nobody	8-70803 8 days ago	8-70803 8 days ago	30-77130 30 days
23916	Vierkantor author:Vierkantor	chore: upstream shake from Mathlib to Batteries	This is an adaptation PR for the upstreaming of shake to Batteries. Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Spinning.20off.20.60mathlib-linters.60.20and.20.60shake.60.20repo --- - [ ] depends on: https://github.com/leanprover-community/batteries/pull/1204 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-linter blocked-by-batt-PR blocked-by-other-PR	3/614	Shake/Main.lean,lake-manifest.json,lakefile.lean	3	4	['Vierkantor', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	8-68424 8 days ago	8-69748 8 days ago	0-894 14 minutes
22882	xroblot author:xroblot	feat(NumberField/Units): add `regOfFamily` and refactor `regulator`	This is a refactor of `NumberField.regulator`. We introduce `regOfFamily` which is the regulator of a family of units indexed by `Fin (Units.rank K)`. It is equal to `0` if the family is not `isMaxRank`. This a `Prop` that says that the image of the family in the `logSpace K` is linearly independent and thus generates a full lattice. All the results about computing the `regulator` by some matrix determinant computation are now proved more generally for `regOfFamily`. The `regulator` of a number field is still defined as the covolume of the `unitLattice` and we prove that is is also equal to `regOfFamily` of the system of fundamental units `fundSystem K`. Together with the results about computing `regOfFamily`, we recover that way the results about computing the regulator. --- - [x] depends on: #22868 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	186/56	Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean	3	4	['alreadydone', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-64673 8 days ago	8-64689 8 days ago	32-72486 32 days
23729	alreadydone author:alreadydone	chore(LinearAlgebra): generalize some lemmas	and move them to earlier files. `rank_subsingleton'`, `rank_punit` and `rank_bot` are generalized from Ring to Semiring. `linearIndependent_subsingleton_iff` is generalized to Semiring and an extraneous NoZeroSMulDivisors condition is removed. `ENat.card_ne_zero_iff_nonempty` is added. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	57/45	Mathlib.lean,Mathlib/Algebra/Algebra/Subalgebra/Rank.lean,Mathlib/LinearAlgebra/Dimension/Basic.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/Dimension/Subsingleton.lean,Mathlib/LinearAlgebra/Dimension/Torsion/Basic.lean,Mathlib/LinearAlgebra/FreeAlgebra.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/SetTheory/Cardinal/Finite.lean	13	10	['alreadydone', 'erdOne', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	8-63936 8 days ago	8-63985 8 days ago	8-82643 8 days
23181	YaelDillies author:YaelDillies	chore(UniformSpace/Defs): move entourages to their own file	What's left in `UniformSpace.Defs` is precisely the theory of the uniformity filter. The motivation is that the theory of coverings and packings in both high dimensional probability and dynamics can be based on entourages, while they have little to do with the uniformity filter (indeed, entourages are in a sense a quantitative version of the uniformity filter). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	180/207	Mathlib.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Entourage.lean	4	12	['ADedecker', 'PatrickMassot', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	8-63740 8 days ago	22-78140 22 days ago	26-12171 26 days
23727	faenuccio author:faenuccio	chore(RingTheory/Valuation/Discrete/Basic): refactor the definition of discrete valuation to allow for more general targets	Co-authored by @mariainesdff The two `ToDo` mentioned in the docstring are WIP by María Inés de Frutos-Fernández and Filippo A. E. Nuccio. --- - [ ] depends on: #23725 - [ ] depends on: #23726	large-import t-algebra awaiting-author blocked-by-other-PR label:t-algebra$	37/24	Mathlib/RingTheory/Valuation/Discrete/Basic.lean	1	6	['github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'pechersky']	nobody	8-62085 8 days ago	11-64683 11 days ago	0-3 3 seconds
23186	grunweg author:grunweg	feat: split continuous linear maps	We define split linear maps and prove their basic properties. --- - [ ] depends on #23175 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 WIP help-wanted	240/0	Mathlib.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Splits.lean	2	1	['github-actions']	nobody	8-56699 8 days ago	8-56699 8 days ago	0-0 0 seconds
23888	j-loreaux author:j-loreaux	feat: properties of graded rings indexed by canonically linearly ordered additive monoids	--- - [ ] depends on: #23883 - [ ] depends on: #23886 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	100/0	Mathlib/Algebra/DirectSum/Internal.lean	1	9	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-54167 8 days ago	8-54764 8 days ago	8-55565 8 days
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: #23175 (preliminaries) - [ ] depends on: #23186 - [ ] depends on: another PR, about `MSplitAt` (to be filed) - and perhaps some prerequisites about products of complemented modules etc. - [ ] 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 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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	8-47040 8 days ago	8-56214 8 days ago	0-0 0 seconds
23251	mariainesdff author:mariainesdff	feat(FieldTheory/IntermediateField/Adjoin): add lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	57/0	Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean	2	16	['alreadydone', 'github-actions', 'mariainesdff', 'tb65536']	nobody	8-40793 8 days ago	25-78988 25 days ago	25-78974 25 days
23718	syur2 author:syur2	feat(Algebra): hom localize equiv localize hom	Add the linear equiv of `S^{-1}(M =>[R] N)` equiv `(S^{-1} M) =>[S^{-1}R] (S^{-1} N)` for finitely presented module `M`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	21/0	Mathlib/Algebra/Module/FinitePresentation.lean	1	1	['github-actions']	nobody	8-24541 8 days ago	13-4086 13 days ago	13-4084 13 days
23930	Vtec234 author:Vtec234	feat(Tactic): dependent rewriting	Add dependent rewrite tactics `rw!` and `rewrite!`. These operate by inserting casts in front of terms that would otherwise become type-incorrect after the rewrite. In the default mode, only proof terms are casted, so that (by proof irrelevance) no observable complexity is added. In the most liberal mode, the tactics never encounter the 'motive is not type correct' error, but may add casts that make the goal or other term very complex. Co-authored-by: Aaron Liu --- This has been discussed on Zulip [here](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/dependent.20rewrite.20tactic/with/504228516). See the included test file for example rewrites that this tactic can do. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	706/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/DepRewrite.lean,MathlibTest/depRewrite.lean	4	1	['github-actions']	nobody	8-21199 8 days ago	8-27448 8 days ago	8-27501 8 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/)	t-algebra label:t-algebra$	19/46	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	13	['YaelDillies', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	8-19053 8 days ago	59-54777 2 months ago	59-63930 59 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	25/12	Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-2492 8 days ago	8-2511 8 days ago	0-352 5 minutes
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$	196/12	Mathlib.lean,Mathlib/Geometry/Group/Marking.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/Group/Quotient.lean	4	12	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-2426 8 days ago	8-2445 8 days ago	22-16818 22 days
22503	Kevew author:Kevew	chore(Nat): Nat factorization multiplicity	Ported lemmas from `Data/Nat/Multiplicity` to into a new file called `Data/Nat/Factorization/Multiplicity`, re-written in terms of `factorization`. Also, I'm new to this so is it fine to have a lemma copied over from another file? Like, I copied over @[simp] theorem Prime.factorization_self {p : ℕ} (hp : Prime p) : p.factorization p = 1 := by simp [hp] from Dat/Nat/Factorization/Basic. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data new-contributor	269/15	Mathlib.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Factorization/Multiplicity.lean,Mathlib/Data/Nat/Multiplicity.lean	4	31	['Kevew', 'Paul-Lez', 'github-actions', 'grunweg']	Kevew assignee:Kevew	7-80125 7 days ago	36-27741 1 month ago	46-58090 46 days
23923	YaelDillies author:YaelDillies	feat: a discrete monoid has compact Pontryagin dual	From LeanAPAP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	47/10	Mathlib/Topology/Algebra/Group/CompactOpen.lean,Mathlib/Topology/Algebra/PontryaginDual.lean,Mathlib/Topology/CompactOpen.lean,Mathlib/Topology/ContinuousMap/Basic.lean,Mathlib/Topology/Separation/NotNormal.lean	5	9	['YaelDillies', 'b-mehta', 'github-actions']	nobody	7-76643 7 days ago	7-76643 7 days ago	7-81710 7 days
19591	joelriou author:joelriou	feat(CategoryTheory/Abelian): Ext^0 and Ext-groups when there are enough projectives	Let `C : Type u` be an abelian category (`Category.{v} C`). We deduce from #19585 that `Ext X Y 0` identifies to the type of morphisms from `X` to `Y`. Moreover, assuming that `C` has enough projectives and is locally `w`-small, i.e. the type of morphisms in `C` are `Small.{w}`, we show that the condition `HasExt.{w}` holds, which means that for `X` and `Y` in `C`, and `n : ℕ`, we may define `Ext X Y n : Type w`. In particular, this holds for `w = v`. This is an important step in order to get a reasonably usable API for Ext-groups. --- - [x] depends on: #19585 - [x] depends on: #19584 - [x] depends on: #19579 - [x] depends on: #19578 - [x] depends on: #19550 - [x] depends on: #19543 - [x] depends on: #19544 - [x] depends on: #19559 - [x] depends on: #19560 - [x] depends on: #19574 - [x] depends on: #19572 - [x] depends on: #19570 - [x] depends on: #19203 - [x] depends on: #18502 - [x] depends on: #19198 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	233/24	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/EnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean	7	n/a	['github-actions', 'joelriou', 'kbuzzard', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mbkybky']	nobody	7-66072 7 days ago	unknown	unknown
23949	Louddy author:Louddy	feat: SkewPolynomial	# Univariate skew polynomials Skew polynomials are represented as `SkewMonoidAlgebra R (Multiplicative ℕ)`, where `R` is usually at least a Semiring. In this file, we define `SkewPolynomial` and provide basic instances. This is currently missing the definition of `coeff` and `single` as they require a more advance interface of `SkewMonoidAlgebra` which is still WIP (See TODOs in file). Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- - [ ] depends on: #22078 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra blocked-by-other-PR label:t-algebra$	600/42	Mathlib.lean,Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean,Mathlib/Algebra/SkewPolynomial/Basic.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-64257 7 days ago	7-64258 7 days ago	0-2389 39 minutes
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	59/0	Mathlib.lean,Mathlib/Analysis/Convex/Polytope.lean	2	5	['Parcly-Taxel', 'YaelDillies', 'eric-wieser', 'github-actions']	nobody	7-63107 7 days ago	7-76610 7 days ago	8-3837 8 days
23749	vasnesterov author:vasnesterov	feat(Analysis/Calculus): Taylor series converges to function on whole ball	* Prove `FormalMultilinearSeries.AnalyticOnNhd`: the sum of series is analytic on its ball of convergence. * Prove `AnalyticOnNhd.hasFPowerSeriesOnBall`: a variant of `AnalyticAt.hasFPowerSeriesAt` which gives convergence to the function on any subball of the ball of convergence where the function is analytic. --- - [x] depends on: #23745 - [x] depends on: #23747 - [ ] depends on: #23748 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis blocked-by-other-PR	94/0	Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-61462 7 days ago	9-77104 9 days ago	0-220 3 minutes
23893	eric-wieser author:eric-wieser	chore: add missing rfl lemmas for the tensor product of coalgebras	These are taken from https://github.com/ImperialCollegeLondon/FLT/blob/eef74b4538c8852363936dfaad23e6ffba72eca5/FLT/mathlibExperiments/Coalgebra/TensorProduct.lean `simps` previously generated the `def` lemmas, but they were badly-named, and probably not actually convenient as `simp` lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	27/8	Mathlib/Algebra/Category/CoalgebraCat/ComonEquivalence.lean,Mathlib/RingTheory/Coalgebra/Basic.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/HopfAlgebra/TensorProduct.lean	4	1	['github-actions']	nobody	7-59885 7 days ago	9-36379 9 days ago	9-36433 9 days
23338	WilliamCoram author:WilliamCoram	feat: restricted power series form a ring	We define restricted powerseries over a normed ring R, and show they form a ring when R has the ultrametric property. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory	186/0	Mathlib.lean,Mathlib/RingTheory/PowerSeries/Restricted.lean	2	17	['Paul-Lez', 'WilliamCoram', 'github-actions', 'grunweg']	nobody	7-58164 7 days ago	23-67517 23 days ago	23-67642 23 days
20704	winstonyin author:winstonyin	feat: existence of local flows of vector fields	I formalise the existence theorem for local flows of time-dependent vector fields (`IsPicardLindelof.exists_forall_mem_closedBall_eq_hasDerivWithinAt`). Currently, if we wish to show the existence of a family of integral curves indexed by their initial conditions, it is necessary to prove the hypotheses of the vector field (Lipschitz continuity within a closed ball, etc.), centred around each of these initial conditions. I have refactored the current proof of the Picard-Lindelöf theorem to allow the initial point to be different from the point about which the hypotheses on the vector field are stated. This way, integral curves and flows are treated on equal footing. Credits going to the original author @urkud, I have completely rewritten the file to accommodate different design choices. Many of the proof steps are nevertheless inspired by Yury's formalisation. * The `PicardLindelof` data structure is removed entirely. It merely bundles the non-Prop arguments into itself. Although it simplifies the assumptions in subsequent proofs, it obscures the (in)dependence on the relevant constants in the type description of theorems. Since `IsPicardLindelof` is already a public facing structure, we should also simply use it internally, without any loss. * In particular, I remove the completely superficial dependence of `FunSpace` on the `PicardLindelof` structure. * `FunSpace` no longer specifies the initial condition. It only needs the initial point to lie in a closed ball (which will be the domain of the local flow). * I avoid defining new non-Prop things that are only used in the proof steps, such as the current `vComp` and `tDist`. The proofs are a little longer as a result, but they are also more readable. * I place all private (i.e. only internally used) theorems under the namespace `FunSpace`, to guide users to the proper theorems in the public API. This is part of my effort to show that the solution to an ODE depends smoothly on the initial condition, or on parameters of the ODE. This is in turn needed for many results about manifolds, such as the fact that $C^1$ vector fields on compact manifolds always have global integral curves (or global flows). I especially welcome any suggestions to rename lemmas or define new structures to simplify the statements. I'm happy to write up the proof in LaTeX as well, if it's going to help reviewers. - [x] depends on: #20696 - [x] depends on: #20731 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis	562/360	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,docs/1000.yaml,docs/undergrad.yaml	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	grunweg assignee:grunweg	7-55136 7 days ago	7-55152 7 days ago	48-25990 48 days
20733	winstonyin author:winstonyin	feat: solution to ODE is Lipschitz with respect to the initial condition	I formalise a corollary to the Picard-Lindelöf theorem: the local solution to an ODE is Lipschitz continuous with respect to the initial condition. This in particular means that the local flow to the associated vector field is continuous. - [ ] depends on: #20704 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis blocked-by-other-PR	688/360	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,docs/1000.yaml,docs/undergrad.yaml	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-52379 7 days ago	7-52395 7 days ago	0-1005 16 minutes
21286	winstonyin author:winstonyin	feat: solutions to $C^n$ vector fields are $C^n$ in time	I prove that solutions to $C^n$ vector fields are also $C^n$ in time, where $n ≤ \infty$. - [ ] depends on: #20733 [technically only depends on #20704 but I'm writing these as incremental PRs] --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-dynamics t-analysis blocked-by-other-PR	795/360	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,docs/1000.yaml,docs/undergrad.yaml	6	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-52295 7 days ago	7-52312 7 days ago	0-298 4 minutes
22254	winstonyin author:winstonyin	feat: $C^1$ vector fields on compact manifolds define global flows	Any $C^1$ vector field on a compact boundaryless manifold `M` defines a unique global flow `ℝ → M → M`. - [ ] depends on: #21777 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	948/408	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/Compact.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean,docs/1000.yaml,docs/undergrad.yaml	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-51923 7 days ago	7-51941 7 days ago	0-18 18 seconds
21777	winstonyin author:winstonyin	feat: existence of local flows on manifolds	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! - [ ] depends on: #20733 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry blocked-by-other-PR WIP	2223/408	Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/ODE/PicardLindelof new.lean,Mathlib/Analysis/ODE/PicardLindelof old.lean,Mathlib/Analysis/ODE/PicardLindelof.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Order/Filter/Prod.lean,docs/1000.yaml,docs/undergrad.yaml	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-51288 7 days ago	7-52274 7 days ago	0-0 0 seconds
18706	FR-vdash-bot author:FR-vdash-bot	perf: change the priority of `*.toSemiring` instances	Need to fix some regressions in subsequent PRs. --- - [ ] depends on: #18468 - [ ] depends on: #18470 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR WIP label:t-algebra$	24/15	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/FieldTheory/Extension.lean,Mathlib/FieldTheory/PurelyInseparable.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/RingTheory/Etale/Field.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/Localization/Integral.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	7-44533 7 days ago	163-20271 5 months ago	0-576 9 minutes
18641	FR-vdash-bot author:FR-vdash-bot	perf: change the priority of `*.toRing` instances	--- - [ ] depends on: #18468 - [ ] depends on: #18470 From #7873. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench slow-typeclass-synthesis t-algebra blocked-by-other-PR label:t-algebra$	7/1	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	4	5	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	7-44531 7 days ago	165-11382 5 months ago	0-627 10 minutes
23324	Parcly-Taxel author:Parcly-Taxel	chore: deprime `induction'` with 5+ variables, part 3	Based on a comment by @apnelson1 on [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508274747). The relevant instances were identified by adding the following to `Mathlib.Tactic.Cases` ```diff diff --git a/Mathlib/Tactic/Cases.lean b/Mathlib/Tactic/Cases.lean index 4a60db6c551..29ec70424c7 100644 --- a/Mathlib/Tactic/Cases.lean +++ b/Mathlib/Tactic/Cases.lean @@ -122,6 +122,16 @@ elab (name := induction') "induction' " tgts:(Parser.Tactic.elimTarget,+) g.assign result.elimApp let subgoals ← ElimApp.evalNames elimInfo result.alts withArg (generalized := fvarIds) (toClear := targetFVarIds) (toTag := toTag) + let body ← inferType targets[0]! + let names : Array Format := if withArg.1.getArgs.size > 1 then + (withArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let gens : Array Format := if genArg.1.getArgs.size > 1 then + (genArg.1.getArgs[1]!).getArgs.map Syntax.prettyPrint else Array.empty + let inductor : Format := if usingArg.1.getArgs.size > 1 then + Syntax.prettyPrint usingArg.1.getArgs[1]! else "~" + if 5 ≤ names.size then + logInfoAt tgts m!"{body.getAppFn.setPPExplicit true} {inductor} {gens} {names} \ + {subgoals.toList.length}" setGoals <\| (subgoals ++ result.others).toList ++ gs /-- The `cases'` tactic is similar to the `cases` tactic in Lean 4 core, but the syntax for giving ``` and then examining [the output](https://github.com/leanprover-community/mathlib4/actions/runs/14085064444/job/39446843657).	tech debt	168/119	Mathlib/Probability/Kernel/Defs.lean,Mathlib/Probability/Moments/Basic.lean,Mathlib/RingTheory/EssentialFiniteness.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/Flat/Equalizer.lean,Mathlib/RingTheory/IsTensorProduct.lean,Mathlib/RingTheory/Kaehler/JacobiZariski.lean,Mathlib/RingTheory/Kaehler/Polynomial.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/RingTheory/Nakayama.lean,Mathlib/RingTheory/Polynomial/Ideal.lean,Mathlib/RingTheory/PowerSeries/Order.lean,Mathlib/RingTheory/Presentation.lean,Mathlib/RingTheory/Smooth/StandardSmooth.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/Unramified/Finite.lean,Mathlib/SetTheory/Lists.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/PGame/Algebra.lean,Mathlib/SetTheory/PGame/Order.lean	22	12	['Parcly-Taxel', 'apnelson1', 'eric-wieser', 'github-actions']	nobody	7-29422 7 days ago	14-53560 14 days ago	22-52936 22 days
23791	SEU-Prime author:SEU-Prime	Create AmiceTrans.lean	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-number-theory WIP	912/0	Mathlib/NumberTheory/Padics/AmiceTrans.lean,Mathlib/NumberTheory/Padics/PowerSeriesAdicCompletation.lean,Mathlib/NumberTheory/Padics/PsiandVar.lean	3	1	['github-actions']	nobody	7-11400 7 days ago	11-57314 11 days ago	0-0 0 seconds
20843	mans0954 author:mans0954	feature(Analysis/LocallyConvex/Polar): Bipolar theorem	WiP: The Bipolar Theorem Following Conway, Chapter V. 1.8. --- - [x] depends on: #21002 - [ ] depends on: #23845 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	107/24	Mathlib.lean,Mathlib/Analysis/LocallyConvex/Bipolar.lean,Mathlib/Analysis/Normed/Module/Dual.lean	3	4	['github-actions', 'j-loreaux', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-4998 7 days ago	7-5014 7 days ago	0-0 0 seconds
23961	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `ENormed*`	Further speed up the search in the algebraic typeclass hierarchy by avoiding searching for `TopologicalSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	slow-typeclass-synthesis maintainer-merge t-algebra t-analysis label:t-algebra$	32/25	Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/NormedSpace/IndicatorFunction.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean	5	8	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	6-85830 6 days ago	6-85831 6 days ago	7-43676 7 days
23137	grunweg author:grunweg	chore(Topology): some more fun_prop tagging	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	8/4	Mathlib/Dynamics/Flow.lean,Mathlib/Topology/Algebra/Monoid.lean	2	8	['github-actions', 'grunweg', 'j-loreaux']	nobody	6-79551 6 days ago	6-79551 6 days ago	13-70626 13 days
22611	grunweg author:grunweg	feat: disjoint unions distribute with products of manifolds	Prove an analogue of [Equiv.prodSumDistrib](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Logic/Equiv/Basic.html#Equiv.prodSumDistrib) and [Homeomorph.prodSumDistrib](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Homeomorph.html#Homeomorph.prodSumDistrib) for smooth manifolds: disjoint unions and products of manifolds are distributive, up to canonical diffeomorphism. This is (up to lots of abstraction) the key result for proving distributivity of the bordism ring. This proof depends on two sorries: - if a function has bijective `mfderiv` at `x`, it is a local diffeomorphism at `x`. This follows from the inverse function theorem for manifolds; I have an old branch which needs just a little more work. - injectivity of the differential of the respective map; this will follow from basic API about `mfderiv` for products and disjoint unions (which is currently missing); I will add that anyway Labelling as please-adopt as help with both of these is welcome. I'll be happy to share my progress towards the two sorries. A useful building block could be to PR the `LinearEquiv.of_injective_finrank_eq` definition. --- - [ ] depends on: #23969 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry please-adopt blocked-by-other-PR WIP	89/3	Mathlib/Geometry/Manifold/Diffeomorph.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/LinearAlgebra/FiniteDimensional/Defs.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-76111 6 days ago	6-76113 6 days ago	0-0 0 seconds
23953	b-reinke author:b-reinke	feat(Data/Matroid/Tutte): define the Tutte polynomial of a matroid	This PR defines the Tutte polynomial of a matroid and shows basic properties. - [ ] depends on: #23926 - [ ] depends on: #23951 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-other-PR WIP	111/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Matroid/Tutte/Basic.lean,Mathlib/Data/Set/Image.lean	3	5	['apnelson1', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	6-69299 6 days ago	7-63394 7 days ago	0-0 0 seconds
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	62/0	Mathlib/ModelTheory/Substructures.lean	1	12	['GabinKolly', 'YaelDillies', 'fpvandoorn', 'github-actions']	nobody	6-55524 6 days ago	6-55524 6 days ago	26-24349 26 days
23329	ScottCarnahan author:ScottCarnahan	feat (LinearAlgebra/RootSystem): nondegeneracy for subrings	This PR adds generalized versions of existing results, where the original base ring is no longer necessarily linearly ordered, but is an algebra over a LinearOrderedCommRing. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	657/289	Mathlib.lean,Mathlib/Algebra/Module/Submodule/LinearMap.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/PerfectPairing/Restrict.lean,Mathlib/LinearAlgebra/RootSystem/Base.lean,Mathlib/LinearAlgebra/RootSystem/BaseChange.lean,Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Lemmas.lean,Mathlib/LinearAlgebra/RootSystem/Finite/Nondegenerate.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean,Mathlib/LinearAlgebra/RootSystem/IsValuedIn.lean,Mathlib/LinearAlgebra/RootSystem/Reduced.lean,Mathlib/LinearAlgebra/RootSystem/RootPositive.lean	14	9	['ScottCarnahan', 'github-actions', 'leanprover-community-bot-assistant', 'ocfnash']	nobody	6-42163 6 days ago	6-45127 6 days ago	11-62922 11 days
22959	ScottCarnahan author:ScottCarnahan	chore (RingTheory/HahnSeries/SummableFamily): refactor HahnSeries.SummableFamily.powers to take junk values	This PR removes the positive order condition on the function `HahnSeries.SummableFamily.powers`, and instead takes the junk value zero when the input has non-positive order. This follows a reviewer suggestion from #20205. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	169/93	Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Summable.lean	2	3	['github-actions', 'jcommelin', 'mathlib-bors']	nobody	6-40727 6 days ago	18-69985 18 days ago	15-77138 15 days
15420	eric-wieser author:eric-wieser	feat: port Mathlib 3's `Nat.factors` norm_num extension to a `simproc`	This is a partial attempt at #15410, porting [#8009](https://github.com/leanprover-community/mathlib3/pull/8009) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-CI t-meta	190/65	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/NormNum/Prime.lean,Mathlib/Tactic/Simproc/Factors.lean,MathlibTest/factors.lean,MathlibTest/norm_num_ext.lean	6	26	['Ruben-VandeVelde', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em']	nobody	6-27707 6 days ago	6-27749 6 days ago	176-12996 176 days
23066	ybenmeur author:ybenmeur	feat: more lemmas for Tannaka duality for finite groups	Prove more of the lemmas needed to prove Tannaka duality for finite groups. --- This is everything that doesn't depend on `eval_of_algHom` (#23065). [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	44/0	Mathlib/RepresentationTheory/Tannaka.lean	1	15	['github-actions', 'kbuzzard', 'ybenmeur']	nobody	6-12280 6 days ago	31-51048 1 month ago	31-51097 31 days
23969	grunweg author:grunweg	feat: add LinearEquiv.ofInjectiveOfFinrankEq	This is used in #22611. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	20/0	Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean	1	7	['eric-wieser', 'github-actions', 'grunweg']	nobody	6-3431 6 days ago	6-77072 6 days ago	6-77129 6 days
23981	robertmaxton42 author:robertmaxton42	feat (Equiv) : sigmas indexed by products are sigmas; pinning down the base of a sigma gives the fiber	Add some convenience defs for working with sigma types that appear frequently when working with hom-like objects: - `Equiv.sigmaAssocProd`, for sigmas of the form `(a : α) × (b : β) × γ a b` - `Equiv.sigmaSubtype` and `Equiv.sigmaSigmaSubtype`, for subtypes of sigmas that "cancel" Also add a convenience lemma for moving conjugations ( $\varepsilon\^{-1} f \varepsilon$ ) from one side of an equation of functions to the other. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-logic	49/0	Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Sum.lean	2	1	['github-actions']	nobody	6-1234 6 days ago	6-25945 6 days ago	6-26002 6 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	33/0	Mathlib/CategoryTheory/Limits/Types/Colimits.lean	1	3	['github-actions', 'joelriou', 'robertmaxton42']	nobody	5-83159 5 days ago	6-507 6 days ago	6-562 6 days
23992	robertmaxton42 author:robertmaxton42	feat (Limits.FunctorCategory): limitIsoFlipCompLim and colimitIsoFlipCompColim are natural	Add `limIsoFlipCompWhiskerLim`, `limCompFlipIsoWhiskerLim`, `colimIsoFlipCompWhiskerColim`, `colimCompFlipIsoWhiskerColim`, each witnessing that their corresponding families of isomorphisms are 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	41/0	Mathlib/CategoryTheory/Limits/FunctorCategory/Basic.lean	1	1	['github-actions']	nobody	5-82843 5 days ago	5-82843 5 days ago	5-82900 5 days
23552	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/PowerSeries/Substitution): define substitution of power series in power series	This is the second part of the PR defining substitution of indeterminates by power series in power series. This one is specific to univariate power series. Basically, the matter is just to remove `Unit ->` in definitions and make the necessary adjustments. --- - [x] depends on: #15158 - [x] depends on: #23607 (minor chore) - [x] depends on: #23642 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	327/18	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean,Mathlib/RingTheory/PowerSeries/Evaluation.lean,Mathlib/RingTheory/PowerSeries/Substitution.lean	4	n/a	['AntoineChambert-Loir', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	5-76521 5 days ago	unknown	unknown
23904	YaelDillies author:YaelDillies	feat: a finitely generated submonoid has a minimal generating set	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-algebra label:t-algebra$	27/0	Mathlib/Data/Finset/Powerset.lean,Mathlib/GroupTheory/Finiteness.lean	2	1	['github-actions']	nobody	5-72060 5 days ago	9-1387 9 days ago	9-1426 9 days
23999	YaelDillies author:YaelDillies	feat: toric ideals	From Toric Co-authored-by: Patrick Luo --- - [ ] depends on: #22635 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebraic-geometry blocked-by-other-PR	84/0	Mathlib.lean,Mathlib/AlgebraicGeometry/Toric/Ideal.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-71338 5 days ago	5-71845 5 days ago	0-0 0 seconds
23539	alreadydone author:alreadydone	feat(Algebra): transcendence degree is well-defined	In AlgebraicIndependent/TranscendenceBasis.lean, we show: + The AlgebraicIndependent sets in a domain form a Matroid, which is used to show all transcendence bases have the same cardinality. Provide algebraic characterizations of the matroid notions `Indep`, `Base`, `cRank`, `Basis`, `closure`, `Flat`, and `Spanning`. + Transcendence bases are exactly algebraic independent families that are spanning (i.e. the whole algebra is algebraic over the algebra generated by the family). On the other hand, a spanning set in a domain contains a transcendence basis. + There always exists an transcendence basis between an arbitrary AlgebraicIndependent set and a spanning set in a domain. + `trdeg R S + trdeg S A = trdeg R A` in a domain, which depends on `AlgebraicIndependent/IsTranscendenceBasis.sumElim_comp`. + A finite AlgebraicIndependent family or spanning family in a domain that has the same cardinality as `trdeg` must be a transcendence basis. --- - [x] depends on: #20887 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	408/28	Mathlib/FieldTheory/IsAlgClosed/Classification.lean,Mathlib/FieldTheory/SeparableDegree.lean,Mathlib/RingTheory/AlgebraicIndependent/RankAndCardinality.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean	4	5	['alreadydone', 'erdOne', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-57088 5 days ago	12-44470 12 days ago	12-45367 12 days
18379	oeb25 author:oeb25	feat(Topology/ENNReal): Add `ENNReal.tsum_biUnion`	This adds infinite versions of `Finset.sum_biUnion` to `ENNReal`s. --- One notable difference from the `Finset` version is that for `tsum` we have two ways for selecting the summands: `∑' x : ⋃ i ∈ S` or `∑' x : ⋃ i, t i`. This PR adds both. I tried to extend this beyond `ENNReal`, but didn't find a clean way to do it. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	26/0	Mathlib/Topology/Instances/ENNReal/Lemmas.lean	1	5	['github-actions', 'grunweg', 'j-loreaux', 'oeb25']	nobody	5-52403 5 days ago	5-62351 5 days ago	81-83431 81 days
22243	luigi-massacci author:luigi-massacci	feat(Topology/MetricSpace/Gluing): Inductive limits of separable spaces are separable	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	23/0	Mathlib/Topology/MetricSpace/Gluing.lean	1	9	['Paul-Lez', 'github-actions', 'j-loreaux', 'luigi-massacci', 'mathlib-bors']	nobody	5-52227 5 days ago	11-58487 11 days ago	2-23272 2 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	2/24	Mathlib/Computability/EpsilonNFA.lean	1	1	['github-actions']	nobody	5-44878 5 days ago	5-46425 5 days ago	5-46482 5 days
23848	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. --- This is a draft for now with two sorries and further golfing needed. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-topology	504/8	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/HomotopyCat.lean,Mathlib/AlgebraicTopology/SimplicialSet/NerveAdjunction.lean,Mathlib/AlgebraicTopology/SimplicialSet/StrictSegal.lean,Mathlib/CategoryTheory/EqToHom.lean,lake-manifest.json	6	1	['github-actions']	nobody	5-44616 5 days ago	7-56726 7 days ago	0-0 0 seconds
23195	vlad902 author:vlad902	feat: generalize Mathlib.Algebra.BigOperators + CharP + Star + misc others	This is one of a series of PRs that generalizes type classes across Mathlib. These are generated using a new linter that tries to re-elaborate theorem definitions with more general type classes to see if it succeeds. It will accept the generalization if deleting the entire type class causes the theorem to fail to compile, and the old type class can not simply be re-synthesized with the new declaration. Otherwise, the generalization is rejected as the type class is not being generalized, but can simply be replaced by implicit type class synthesis or an implicit type class in a variable block being pulled in. The linter currently output debug statements indicating source file positions where type classes should be generalized, and a script then makes those edits. This file contains a subset of those generalizations. The linter and the script performing re-writes is available in commit 5e2b7040be0f73821c1dcb360ffecd61235d87af. Also see discussion on Zulip here: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Elab.20to.20generalize.20type.20classes.20for.20theorems/near/498862988 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Elab.20to.20generalize.20type.20classes.20for.20theorems/near/501288855 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	51/46	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/AlgebraicCard.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/GroupWithZero/Action.lean,Mathlib/Algebra/BigOperators/Pi.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Algebra/BigOperators/RingEquiv.lean,Mathlib/Algebra/CharP/Algebra.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/DirectSum/Basic.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/Pointwise.lean,Mathlib/Algebra/Star/SelfAdjoint.lean	18	9	['github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'urkud', 'vlad902']	nobody	5-43511 5 days ago	5-43537 5 days ago	15-79841 15 days
24010	grunweg author:grunweg	feat(Counterexamples): a non-negative function, not a.e. zero, with vanishing lowe…	…r Lebesgue integral. Came up in #23707, let's document this while we're at it. --- - [ ] depends on: #20722 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	5-42641 5 days ago	5-42643 5 days ago	0-22 22 seconds
23991	grunweg author:grunweg	feat(pr_summary.yml): mentioned moved files without module deprecation in the summary comment	If a PR's diff contains files which were moved or deleted that are not module deprecations, mention these in the PR's summary comment (as an indication to reviewers). Also add or remove a `file-removed` label if such moves without deprecations are present in the diff. --- Tested with no, one and two files removed without deprecations: the summary comment behaved as expected. TODOs: the label managing step fails TODO: tweak the grep syntax, to search for `deprecated_module ` (with a space) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	44/2	.github/workflows/PR_summary.yml	1	7	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	5-38681 5 days ago	5-38716 5 days ago	5-38703 5 days
23439	YaelDillies author:YaelDillies	chore(SimpleGraph/Prod): correct lemma names	The head function should come first in the name even if dot notation is used. --- In the future, we might want to rename `boxProd_adj` to `adj_boxProd`: 1. If we apply the basic algorithm from Std (https://github.com/leanprover/lean4/blob/master/doc/std/naming.md#naming-algorithm-for-theorems-and-some-definitions), we encounter `Adj` first, so we write it first. 2. The mathlib-specific algorithm says that most predicates should be prefixed: https://leanprover-community.github.io/contribute/naming.html#predicates-as-suffixes 3. Dot notation isn't an infix operator, although we can of course decide on a case by case basis that a specific function we are dot notating on is actually an infix. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	18/7	Mathlib/Combinatorics/SimpleGraph/Prod.lean	1	15	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions']	nobody	5-38589 5 days ago	6-4296 6 days ago	18-12483 18 days
23998	YaelDillies author:YaelDillies	feat: finitely related modules	Define finitely related modules, which are modules admitting a presentation with finitely many relations. This notion does not seem to appear in the literature. However it is useful to unify the two main cases where a module `M` is separated by its dual `M →ₗ[R] R`: * when `M` is free * when `M` is finitely generated Co-authored-by: Calle Sönne --- - [x] depends on: #23996 - [ ] depends on: #23997 [![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$	136/60	Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-36580 5 days ago	5-72521 5 days ago	0-270 4 minutes
23920	YaelDillies author:YaelDillies	feat: entourage-separated sets	Define a notion of separation of a set relative to an entourage. This will be used to unify metric and dynamical separation. From MiscYD and LeanAPAP --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	61/0	Mathlib.lean,Mathlib/Topology/UniformSpace/Separated.lean	2	13	['D-Thomine', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	5-34927 5 days ago	5-34927 5 days ago	5-43882 5 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	5-33889 5 days ago	5-71841 5 days ago	0-1 1 second
22684	vlad902 author:vlad902	feat(Topology): add `ContinuousOn` union API lemmas	Add two lemmas to allow going from continuity of a union to continuity on the individual sets, and continuity on two open sets to continuity on their union. Note that there is already an existing lemma for continuity of the union of two closed sets.	new-contributor t-topology	30/3	Mathlib/Topology/ContinuousOn.lean	1	17	['Paul-Lez', 'github-actions', 'grunweg', 'peabrainiac', 'vlad902']	nobody	5-31303 5 days ago	42-75302 1 month ago	42-75297 42 days
24019	urkud author:urkud	feat(Analysis): Poincaré lemma for 1-forms	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		695/27	Mathlib.lean,Mathlib/Analysis/Calculus/Poincare/OneForm.lean,Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/Order/Interval/Set/UnorderedInterval.lean,Mathlib/Topology/Homotopy/Basic.lean,Mathlib/Topology/Homotopy/Path.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UnitInterval.lean	11	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	5-10797 5 days ago	5-14969 5 days ago	0-0 0 seconds
21270	GabinKolly author:GabinKolly	feat(ModelTheory/Bundled): first-order embeddings and equivalences from equalities	Add first-order embeddings and equivalences from equalities between bundled structures. --- Add two definitions to get embeddings and equivalences from equalities between bundled structures, and simple properties. This is some preparatory work for #18876 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-logic awaiting-author	102/0	Mathlib/ModelTheory/Bundled.lean	1	26	['GabinKolly', 'Vierkantor', 'YaelDillies', 'github-actions']	nobody	5-3862 5 days ago	5-3862 5 days ago	50-58472 50 days
22450	joelriou author:joelriou	feat(CategoryTheory): left derivability structures	Using the duality result from #22447, we dualise the notion of right derivability structure introduced in #12633 in order to formalize left derivability structures. This shall be used in order to construct left derived functors. --- - [x] depends on: #22447 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	66/2	Mathlib/CategoryTheory/GuitartExact/Opposite.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/Resolution.lean	3	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	5-3348 5 days ago	5-3938 5 days ago	5-6211 5 days
23490	erdOne author:erdOne	feat(Algebra/Category): the category of topological modules	Co-authored-by: Richard Hill --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	532/0	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Topology/Basic.lean,MathlibTest/CategoryTheory/ConcreteCategory/TopModuleCat.lean	3	16	['chrisflav', 'erdOne', 'github-actions', 'kbuzzard']	nobody	5-2967 5 days ago	11-74722 11 days ago	6-86010 6 days
24003	eric-wieser author:eric-wieser	refactor: mixin class for `norm_smul` with strict equality	Define a typeclass for normed modules where the norm is exactly multiplicative (not just sub-multiplicative). This is a subset of #23787, leaving out the change to `NormedSpace`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		89/44	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	14	6	['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-bot', 'loefflerd']	nobody	5-2517 5 days ago	5-2602 5 days ago	5-62688 5 days
23787	loefflerd author:loefflerd	refactor: mixin class for `norm_smul` with strict equality	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis WIP	165/135	Mathlib/Analysis/Asymptotics/Lemmas.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/Matrix.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/InnerProductSpace/Defs.lean,Mathlib/Analysis/LocallyConvex/Basic.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Affine/AddTorsor.lean,Mathlib/Analysis/Normed/Affine/ContinuousAffineMap.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Algebra/Unitization.lean,Mathlib/Analysis/Normed/Algebra/UnitizationL1.lean,Mathlib/Analysis/Normed/Group/Quotient.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/Span.lean,Mathlib/Analysis/Normed/MulAction.lean,Mathlib/Analysis/NormedSpace/ENormedSpace.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Basic.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/NormedSpace/Pointwise.lean,Mathlib/Analysis/Quaternion.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Dynamics/BirkhoffSum/NormedSpace.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean,Mathlib/MeasureTheory/Function/LpSpace/Basic.lean,Mathlib/MeasureTheory/Function/SimpleFuncDenseLp.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/ContinuousMap/Compact.lean,Mathlib/Topology/ContinuousMap/ContinuousMapZero.lean,Mathlib/Topology/ContinuousMap/ZeroAtInfty.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean,docs/overview.yaml,docs/undergrad.yaml	41	61	['eric-wieser', 'github-actions', 'kbuzzard', 'leanprover-bot', 'loefflerd', 'mathlib-bors', 'urkud']	nobody	5-2305 5 days ago	5-2305 5 days ago	0-0 0 seconds
23074	plp127 author:plp127	feat: `Fact (0 < 1)` and `Fact (0 ≤ 1)`	Adds `Fact (0 < 1)` and `Fact (0 ≤ 1)`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	7/0	Mathlib/Algebra/Order/ZeroLEOne.lean	1	7	['Ruben-VandeVelde', 'github-actions', 'kim-em', 'leanprover-bot', 'plp127', 'vlad902']	nobody	5-1996 5 days ago	31-39884 1 month ago	31-39930 31 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	161/168	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	11	['Vierkantor', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	4-81691 4 days ago	8-2624 8 days ago	0-17 17 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/)	t-computability new-contributor awaiting-author	278/1	Mathlib/Computability/NFA.lean	1	38	['EtienneC30', 'github-actions', 'meithecatte', 'rudynicolop']	EtienneC30 assignee:EtienneC30	4-81245 4 days ago	4-81245 4 days ago	30-64042 30 days
23933	alreadydone author:alreadydone	chore(LinearAlgebra/Dual): generalize to semirings	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	102/100	Archive/Sensitivity.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Dual/Basis.lean,Mathlib/LinearAlgebra/Dual/Defs.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/InvariantBasisNumber.lean	7	14	['alreadydone', 'eric-wieser', 'github-actions']	nobody	4-80255 4 days ago	8-21889 8 days ago	8-22095 8 days
23826	javra author:javra	feat(CategoryTheory): linear categories as `ModuleCat R`-enriched categories	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-category-theory	195/0	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	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	4-80172 4 days ago	4-80183 4 days ago	4-80169 4 days
23584	mariainesdff author:mariainesdff	chore(RingTheory/Valuation/Extension): rename IsValExtension to Valuation.IsExtension	This change is to remove `IsValExtension` from the root namespace and to allow dot notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	21/15	Mathlib.lean,Mathlib/RingTheory/Valuation/Extension.lean	2	4	['erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'mariainesdff']	nobody	4-70122 4 days ago	4-70142 4 days ago	13-45676 13 days
23254	mariainesdff author:mariainesdff	feat(Data/NNReal/Basic): add multiset_prod_le_pow_card	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	25/2	Mathlib/Algebra/Order/BigOperators/GroupWithZero/List.lean,Mathlib/Algebra/Order/BigOperators/GroupWithZero/Multiset.lean	2	4	['Ruben-VandeVelde', 'github-actions', 'mariainesdff']	nobody	4-66789 4 days ago	4-66796 4 days ago	20-24638 20 days
23178	mariainesdff author:mariainesdff	feat: add iSup lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	92/4	Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/Order/ConditionallyCompleteLattice/Basic.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean,Mathlib/Topology/Instances/NNReal/Lemmas.lean	6	30	['D-Thomine', 'YaelDillies', 'github-actions', 'jcommelin', 'mariainesdff']	nobody	4-65848 4 days ago	5-41967 5 days ago	15-12554 15 days
22327	YaelDillies author:YaelDillies	chore: deprecate former interaction of finite intervals and succ/pred lemmas	--- - [x] depends on: #22290 - [x] depends on: #23630 - [ ] depends on: #24037 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order awaiting-author blocked-by-other-PR	88/56	Archive/Imo/Imo2024Q1.lean,Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/BigOperators/Module.lean,Mathlib/Algebra/CharP/Lemmas.lean,Mathlib/Algebra/GeomSum.lean,Mathlib/Algebra/Order/Interval/Finset/SuccPred.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Combinatorics/SetFamily/AhlswedeZhang.lean,Mathlib/Data/Nat/Choose/Sum.lean,Mathlib/Data/Nat/Factorial/SuperFactorial.lean,Mathlib/Data/Nat/Factorization/Basic.lean,Mathlib/Data/Nat/Totient.lean,Mathlib/MeasureTheory/Measure/Decomposition/Hahn.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/NumberTheory/FactorisationProperties.lean,Mathlib/NumberTheory/Harmonic/Bounds.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/Order/Interval/Finset/Nat.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean	21	19	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-65285 4 days ago	4-65286 4 days ago	7-75452 7 days
24041	YuvalFilmus author:YuvalFilmus	feat: add support for bigop binders of the form "not in" and "not equal"	feat: add support for bigop binders of the form "not in" and "not equal" Added two new binders which can be used with big operators (product and summation). The first, "not in", translates into "in ... complement". The second, "not equal to", translates to `univ.erase ...`. Also, improved documentation in the file header. Delaboration updates can be considered next if wanted (to be coordinated with #22048). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	7/0	Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean	1	1	['github-actions']	nobody	4-61933 4 days ago	4-63234 4 days ago	4-63293 4 days
17404	YaelDillies author:YaelDillies	chore: Merge the two series of lemmas on big operators in locally finite orders	I accidentally introduced those lemmas twice: In #9386 and also in #17280 under different names. I prefer the names I gave in the former, but the file I gave in the latter. Also generalise other lemmas in `Algebra.BigOperators.Intervals` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-order t-algebra WIP label:t-algebra$	61/93	Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Algebra/Order/BigOperators/Group/LocallyFinite.lean	2	1	['github-actions']	nobody	4-60581 4 days ago	49-74966 1 month ago	0-13 13 seconds
23725	faenuccio author:faenuccio	feat(Order/Group/Cyclic): provide basic properties of cyclic linearly ordered commutative groups	Co-authored with @mariainesdff	t-order t-algebra label:t-algebra$	67/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Cyclic.lean	2	16	['Ruben-VandeVelde', 'erdOne', 'faenuccio', 'github-actions', 'kbuzzard']	nobody	4-59934 4 days ago	4-61164 4 days ago	9-247 9 days
23726	faenuccio author:faenuccio	feat(RingTheory/Valuation/Basic): defined Nontrivial valuations	Co-authored with @mariainesdff	t-algebra label:t-algebra$	19/1	Mathlib/RingTheory/Valuation/Basic.lean	1	4	['faenuccio', 'github-actions', 'kbuzzard']	nobody	4-58128 4 days ago	4-59913 4 days ago	4-62189 4 days
23590	mariainesdff author:mariainesdff	feat(RingTheory/Valuation/Extension): add algebra instances	Provide algebra instances for valuation subrings and residue fields. Co-authored-by: @faenuccio --- - [ ] depends on: #23408 - [ ] depends on: #23584 [![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$	83/17	Mathlib.lean,Mathlib/RingTheory/Valuation/Extension.lean,Mathlib/RingTheory/Valuation/Integers.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-58121 4 days ago	4-70094 4 days ago	0-0 0 seconds
23034	plp127 author:plp127	feat: `AddMonoidWithOne.toCharZero`	This replaces `StrictOrderedSemiring.toCharZero`. Requested by @vihdzp in [#Is there code for X? > OrderedAddCommGroup has CharZero](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/OrderedAddCommGroup.20has.20CharZero) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	7/2	Mathlib/Algebra/Order/Ring/Defs.lean	1	17	['eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot', 'plp127']	nobody	4-48772 4 days ago	4-52113 4 days ago	28-41568 28 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 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	4-42827 4 days ago	4-42827 4 days ago	14-6036 14 days
23929	meithecatte author:meithecatte	feat(Computability/NFA): improve bound on pumping lemma	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability new-contributor	203/20	Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/NFA.lean	2	1	['github-actions']	nobody	4-39116 4 days ago	8-28226 8 days ago	8-28282 8 days
22256	plp127 author:plp127	feat: Metric Spaces are T6	This PR shows that metric spaces are T6. It also generalizes the contents of Mathlib/Topology/GDelta/UniformSpace to apply to metrizable spaces. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.60IsClosed.2EisG.CE.B4.60) thread. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	127/63	Mathlib.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/Order/Interval/Set/Disjoint.lean,Mathlib/Topology/Baire/BaireMeasurable.lean,Mathlib/Topology/GDelta/Basic.lean,Mathlib/Topology/GDelta/MetrizableSpace.lean,Mathlib/Topology/GDelta/UniformSpace.lean,Mathlib/Topology/MetricSpace/HausdorffDistance.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/Separation/GDelta.lean	11	29	['github-actions', 'grunweg', 'j-loreaux', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'plp127', 'urkud']	nobody	4-34757 4 days ago	45-32933 1 month ago	52-32528 52 days
24053	plp127 author:plp127	feat(Topology): Priestley spaces are totally separated	This generalizes `PriestleySpace.toT2Space` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	9/5	Mathlib/Topology/Order/Priestley.lean	1	3	['github-actions', 'plp127', 'urkud']	nobody	4-34385 4 days ago	4-38197 4 days ago	4-38184 4 days
24045	vlad902 author:vlad902	chore(scripts/install_macos): Fix 2 PATH resolution issues	A fresh local install fails with this script due to PATH resolution issues in two places. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		6/0	scripts/install_macos.sh	1	2	['eric-wieser', 'github-actions']	nobody	4-17450 4 days ago	4-51973 4 days ago	4-51960 4 days
24066	urkud author:urkud	refactor(Path): turn `Path.extend` into a `ContinuousMap`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	44/47	Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Topology/Path.lean	2	1	['github-actions']	nobody	4-7547 4 days ago	4-7548 4 days ago	4-7608 4 days
20263	joelriou author:joelriou	feat(CategoryTheory): locally presentable and accessible categories	--- - [x] depends on: #19937 - [x] depends on: #19945 - [x] depends on: #19959 - [x] depends on: #20005 - [x] depends on: #19955 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory WIP	220/3	Mathlib.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Presentable/CardinalFilteredPresentation.lean,Mathlib/CategoryTheory/Presentable/LocallyPresentable.lean,Mathlib/SetTheory/Cardinal/HasCardinalLT.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-4341 4 days ago	4-4439 4 days ago	0-70 1 minute
23915	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 #22508. 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.) --- - [ ] depends on: #22508 - [ ] depends on: #22474 - [ ] depends on: #22490 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	598/10	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/PointwiseRightDerived.lean,Mathlib/CategoryTheory/Functor/Derived/RightDerived.lean,Mathlib/CategoryTheory/Functor/KanExtension/Pointwise.lean,Mathlib/CategoryTheory/Iso.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/CategoryTheory/Limits/Opposites.lean,Mathlib/CategoryTheory/Limits/Shapes/Products.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Basic.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Derives.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/PointwiseRightDerived.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-4136 4 days ago	8-72485 8 days 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.		96/0	scripts/README.md,scripts/topological_sort.py	2	4	['github-actions', 'jcommelin', 'kim-em']	nobody	4-3314 4 days ago	4-14352 4 days ago	4-14339 4 days
22367	joelriou author:joelriou	feat(CategoryTheory/Abelian): Noetherian objects form a Serre class	In this PR, we define a type class `IsNoetherianObject X` for any object `X` in a category `C`: it is defined as the ascending chain condition for subobjects of `X`. When `C` is an abelian category, we show that this defines a Serre class. --- This is a draft. - [x] depends on: #22373 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	4-3186 4 days ago	4-3202 4 days ago	0-0 0 seconds
23385	bsubercaseaux author:bsubercaseaux	feat(Combinatorics/SimpleGraph/Prod): add edist lemmas about graph box product	This PR adds some basic lemmas about metric aspects of box products. In particular, it adds: a lemma stating that `(G □ H).edist x y = G.edist x.1 y.1 + H.edist x.2 y.2`, and a couple of auxiliary facts to prove it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics awaiting-author	54/0	Mathlib/Combinatorics/SimpleGraph/Prod.lean	1	49	['YaelDillies', 'b-mehta', 'bsubercaseaux', 'eric-wieser', 'github-actions']	nobody	3-86223 3 days ago	4-37857 4 days ago	1-30675 1 day
22707	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: #22632 - [x] depends on: #22705 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	537/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-85012 3 days ago	41-83443 1 month ago	0-464 7 minutes
22632	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: #22631 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	381/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-84958 3 days ago	43-59183 1 month ago	0-1204 20 minutes
22972	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: #22632 - [ ] depends on: #22705 - [ ] depends on: #22707 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	732/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/FilteredAlgebra/Exactness.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-84943 3 days ago	33-85269 1 month ago	0-1201 20 minutes
20913	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Define the associated graded ring to filtered ring.	Define the associated graded ring to a filtered ring. --- - [x] depends on: #20900 - [x] depends on: #22230 - [ ] depends on: #22631 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	445/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-84120 3 days ago	43-72420 1 month ago	0-70480 19 hours
21806	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): associated graded algebra	Define the associated graded algebra of a filtered algebra, constructed from a special case of associated graded ring. --- - [x] depends on: #20900 - [ ] depends on: #20913 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR WIP label:t-algebra$	555/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean	3	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-83583 3 days ago	unknown	unknown
20940	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): Associated graded module	Define the associated graded module to a filtered module. --- - [x] depends on: #20900 - [ ] depends on: #20913 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR WIP label:t-algebra$	659/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-83324 3 days ago	54-73124 1 month ago	0-1265 21 minutes
22208	Thmoas-Guan author:Thmoas-Guan	feat(Algebra):filtered ring hom	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: #20913 - [ ] depends on: #22632 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	809/0	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-83123 3 days ago	28-67965 28 days ago	0-267 4 minutes
24069	jcommelin author:jcommelin	doc(Topology/CWComplex): cross-reference abstract and classical approaches	* Add implementation notes to both Abstract/Basic.lean and Classical/Basic.lean explaining the relationship between the two approaches to CW complexes * Add TODO noting the missing connection between the approaches * Clarify that Abstract/Basic.lean uses a categorical approach while Classical/Basic.lean uses Whitehead's classical approach --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-topology	23/2	Mathlib/Topology/CWComplex/Abstract/Basic.lean,Mathlib/Topology/CWComplex/Classical/Basic.lean	2	3	['github-actions', 'grunweg']	nobody	3-83020 3 days ago	3-83021 3 days ago	4-1594 4 days
22454	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): define filtered algebra morphisms	In this PR, we define the filtered algebra morphisms on algebras and prove some basic properties of them. --- - [ ] depends on: #21806 - [ ] depends on: #22208 [![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$	1042/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-82985 3 days ago	unknown	unknown
22893	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: #22208 - [ ] depends on: #20940 [![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$	1190/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean,Mathlib/RingTheory/FilteredAlgebra/FilteredHom.lean	4	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-82863 3 days ago	unknown	unknown
23500	DrLSimon author:DrLSimon	feat(MeasureTheory/Decomposition): link the clipped sub of positive measures to Jordan decomposition	This introduces a new file `Mathlib/MeasureTheory/Decomposition/JordanSub.lean` which develops the Jordan decomposition of the signed measure `μ.toSignedMeasure - ν.toSignedMeasure` for finite measures `μ` and `ν`, expressing it as the pair `(μ - ν, ν - μ)` of mutually singular finite measures. The key tool is the Hahn decomposition theorem, which yields a measurable partition of the space where `μ ≥ ν` and `ν ≥ μ`. Some basic results of `VectorMeasure` are also provided such as `restrict_neg`, `restrict_sub` `restrict_add_restrict_compl` and `Measure.toSignedMeasure_le_iff` within the `JordanSub.lean` file. They could be moved to another more central place (I guess `VectorMeasure/Basic.lean`). Similarly, `Measure.sub_zero` could go to `Sub.lean`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-measure-probability	257/0	Mathlib.lean,Mathlib/MeasureTheory/VectorMeasure/Decomposition/JordanSub.lean	2	25	['DrLSimon', 'EtienneC30', 'github-actions', 'grunweg']	EtienneC30 assignee:EtienneC30	3-82529 3 days ago	4-11216 4 days ago	9-5322 9 days
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	138/33	Mathlib/RingTheory/Perfection.lean,Mathlib/Tactic/Linter/Style.lean,Mathlib/Topology/MetricSpace/GromovHausdorffRealized.lean,MathlibTest/GeneralizeProofs.lean,MathlibTest/LintStyle.lean	5	5	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-81432 3 days ago	4-74294 4 days ago	5-22118 5 days
23997	YaelDillies author:YaelDillies	feat: `ι →₀ R` is a finite `R`-module iff `ι` is finite	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	81/42	Mathlib/Data/Finsupp/Single.lean,Mathlib/Data/Matrix/Rank.lean,Mathlib/LinearAlgebra/Basis/Cardinality.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/FreeAndStrongRankCondition.lean,Mathlib/LinearAlgebra/Dimension/StrongRankCondition.lean,Mathlib/LinearAlgebra/Finsupp/Supported.lean,Mathlib/LinearAlgebra/Finsupp/VectorSpace.lean,Mathlib/LinearAlgebra/StdBasis.lean,Mathlib/RingTheory/Finiteness/Cardinality.lean	10	17	['YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions']	nobody	3-79844 3 days ago	5-73293 5 days ago	5-73355 5 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`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	91/11	Mathlib/Algebra/Ring/Units.lean,Mathlib/RingTheory/Localization/Away/Basic.lean	2	8	['github-actions', 'plp127', 'vihdzp']	nobody	3-72527 3 days ago	43-34529 1 month ago	43-34573 43 days
22078	Louddy author:Louddy	feat(SkewMonoidAlgebra): multiplication and algebraic instances	# Multiplication and Algebraic Instances In this PR, we introduce the definition of the skewed convolution product on `SkewMonoidAlgebra k G`. 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`. We also introduce the associated algebraic instances. ## Context This is the third part of a planned series of PRs aiming to formalise skew monoid algebras. The PRs are split to ease the review process. The moral sum of these planned PRs is #10541. The first and second part were #15878 and #19084. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-algebra label:t-algebra$	443/42	Mathlib/Algebra/SkewMonoidAlgebra/Basic.lean	1	38	['AntoineChambert-Loir', 'Louddy', 'github-actions', 'kbuzzard']	nobody	3-71573 3 days ago	10-58840 10 days ago	47-22556 47 days
23547	chrisflav author:chrisflav	feat(AlgebraicGeometry): codescent implies descent	Let `P` and `P'` be morphism properties of schemes. We show some results to deduce that `P` descends along `P'` from a codescent property of ring homomorphisms. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry	260/1	Mathlib.lean,Mathlib/AlgebraicGeometry/Morphisms/AffineAnd.lean,Mathlib/AlgebraicGeometry/Morphisms/Descent.lean,Mathlib/RingTheory/RingHomProperties.lean	4	12	['chrisflav', 'erdOne', 'github-actions']	nobody	3-67965 3 days ago	17-65220 17 days ago	17-65206 17 days
23722	YaelDillies author:YaelDillies	feat(Bialgebra/MonoidAlgebra): `mapDomain` as a `BialgHom`	From Toric Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric maintainer-merge t-algebra label:t-algebra$	64/16	Mathlib/RingTheory/Bialgebra/Hom.lean,Mathlib/RingTheory/Bialgebra/MonoidAlgebra.lean	2	9	['YaelDillies', 'erdOne', 'eric-wieser', 'github-actions']	nobody	3-61021 3 days ago	3-79925 3 days ago	12-80253 12 days
24078	jcommelin author:jcommelin	chore(LinearAlgebra): golf two proofs and remove porting notes	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra delegated label:t-algebra$	62/89	Mathlib/LinearAlgebra/Dimension/DivisionRing.lean,Mathlib/LinearAlgebra/LinearIndependent/Basic.lean	2	6	['b-mehta', 'github-actions', 'grunweg', 'mathlib-bors', 'riccardobrasca']	nobody	3-59636 3 days ago	3-61645 3 days ago	0-10728 2 hours
24083	Parcly-Taxel author:Parcly-Taxel	feat: the `longFileHard` linter	@kim-em [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/long.20files/near/510548946): > Yes, we don't have a sustainable mechanism that will prevent long files creeping back, unless when we reach "no long file", we turn it into an non-overridable error...! > > It would be great to have such a mechanism, of course, because I agree, of course, that this would be annoying to contributors (and doubly annoying to reviewers if they had to remind contributors not to "compress" things).	awaiting-zulip t-linter	72/1	Mathlib/Tactic/Linter/Style.lean,MathlibTest/LongFile.lean,lakefile.lean	3	2	['github-actions', 'grunweg']	nobody	3-58314 3 days ago	3-58314 3 days ago	0-5347 1 hour
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	3-56899 3 days ago	3-61699 3 days ago	0-0 0 seconds
23964	BoltonBailey author:BoltonBailey	docs: Add documentation arbitrarily	@mattrobball asked in the Mathlib Community meeting today what it would look like if we asked Claude code to give us improved documentation. I made this draft PR by selecting five declarations arbitrarily from `nolints.json` and asking Cursor to document them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	documentation	49/1	Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean	5	8	['ADedecker', 'BoltonBailey', 'eric-wieser', 'github-actions', 'jcommelin', 'mattrobball']	nobody	3-56289 3 days ago	6-43629 6 days ago	7-20251 7 days
24091	mattrobball author:mattrobball	test			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	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	3-53590 3 days ago	3-55435 3 days ago	0-0 0 seconds
23872	joelriou author:joelriou	feat: multicoequalizers in the category of types	This PR gives a concrete criteria for a multicofork in the category of types to be a multicoequalizer, and this is used in order to show that if a (sub)set `A : Set X` is the union of certain subsets `U i`, then the type `A` is the multicoequalizer of the `U i`s along their intersections `V i j`. (A similar result for `Subpresheaf` rather than `Set` will be deduced in a separate PR, and this shall be very important in the study of the homotopy theory of simplicial sets, as this will allow the construction of morphisms from horns.) --- - [ ] depends on: #23364 - [ ] depends on: #22205 - [ ] depends on: #21032 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	1222/367	Mathlib.lean,Mathlib/Algebra/Category/Grp/Basic.lean,Mathlib/Algebra/Category/Grp/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/MonCat/Basic.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Basic.lean,Mathlib/Algebra/Category/Ring/FilteredColimits.lean,Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Limits/FintypeCat.lean,Mathlib/CategoryTheory/Limits/IsConnected.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Preserves/Ulift.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Shapes/MultiequalizerPullback.lean,Mathlib/CategoryTheory/Limits/Shapes/SingleObj.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean,Mathlib/CategoryTheory/Limits/Types/Colimits.lean,Mathlib/CategoryTheory/Limits/Types/Filtered.lean,Mathlib/CategoryTheory/Limits/Types/Multicoequalizer.lean,Mathlib/CategoryTheory/Types.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean,Mathlib/Topology/Category/TopCat/Limits/Basic.lean	23	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-52671 3 days ago	9-63334 9 days ago	0-0 0 seconds
21032	joelriou author:joelriou	feat(Order): bicartesian squares in lattices	This PR introduces the notion of bicartesian square in lattices (and a more general "multicoequalizer" version in complete lattices). In the case of the lattice `Set X`, this will give respectively bicartesian squares (both pushout and pullback) and multicoequalizer diagrams in the category of sets. --- - [ ] depends on: #22203 - [ ] depends on: #21026 - [ ] depends on: #20988 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order t-category-theory blocked-by-other-PR WIP	321/3	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/Multiequalizer.lean,Mathlib/CategoryTheory/Limits/Shapes/MultiequalizerPullback.lean,Mathlib/Order/CompleteLattice/MulticoequalizerDiagram.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-52573 3 days ago	9-68910 9 days ago	0-16 16 seconds
21026	joelriou author:joelriou	feat(CategoryTheory/Limits): certain multicoequalizers are pushouts	In this file, we show that a multicoequalizer for for `I : MultispanIndex (.ofLinearOrder ι) C` is also a pushout when `ι` has exactly two elements. --- - [x] depends on: #22203 - [x] depends on: #20988 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	95/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Shapes/MultiequalizerPullback.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-52567 3 days ago	3-52574 3 days ago	16-57194 16 days
24082	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Algebra/Group/End) : add MulAut.inv_apply and some simp lemmas	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	23/5	Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean	2	6	['AntoineChambert-Loir', 'eric-wieser', 'github-actions']	nobody	3-50656 3 days ago	3-66028 3 days ago	3-66088 3 days
23339	joelriou author:joelriou	feat(CategoryTheory): the colimit type of a functor to types	Given a category `J` (with `J : Type u` and `[Category.{v} J]`) and a functor `F : J ⥤ Type w`, we introduce a type `F.ColimitType : Type (max u w)`, which satisfies a certain universal property of the colimit: it is defined as a suitable quotient of `Σ j, F.obj j`. This universal property is not expressed in a categorical way (as in general `Type (max u w)` is not the same as `Type u`). (This type `F.ColimitType` is basically the same as `CategoryTheory.Limits.Types.Quot` that is defined in `CategoryTheory.Limits.Types`, but we expand the API (with minimal imports to category theory) so that it may be used in future PRs to refactor both `DirectedSystem` and the construction of colimits in `Type`.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	272/0	Mathlib.lean,Mathlib/CategoryTheory/Limits/Types/ColimitType.lean	2	3	['AntoineChambert-Loir', 'github-actions', 'joelriou']	nobody	3-49671 3 days ago	16-54198 16 days ago	23-37338 23 days
22631	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 #20913 --- - [ ] depends on: #24071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	158/4	Mathlib.lean,Mathlib/RingTheory/FilteredAlgebra/AssociatedGraded.lean,Mathlib/RingTheory/FilteredAlgebra/Basic.lean	3	16	['AntoineChambert-Loir', 'Thmoas-Guan', 'eric-wieser', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot']	nobody	3-48125 3 days ago	3-48128 3 days ago	43-41740 43 days
22176	ybenmeur author:ybenmeur	feat: Tannaka duality for finite groups	Proves Tannaka duality for finite groups. - [ ] depends on: #23066 - [x] depends on: #23065 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra blocked-by-other-PR label:t-algebra$	87/1	Mathlib/RepresentationTheory/Tannaka.lean	1	3	['github-actions', 'jcommelin', 'mathlib4-dependent-issues-bot']	nobody	3-46686 3 days ago	24-58007 24 days ago	0-2095 34 minutes
24023	robin-carlier author:robin-carlier	feat(Data/List/Sort): ext lemma for strictly sorted lists	Add a theorem stating that two strictly sorted lists are equal if they have the same set of elements. --- Suggested by @joelriou in #21744. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	5/1	Mathlib/Data/List/Sort.lean	1	8	['b-mehta', 'github-actions', 'joelriou', 'robin-carlier']	nobody	3-42773 3 days ago	4-79544 4 days ago	4-85233 4 days
23857	urkud author:urkud	chore(Group/Pointwise/Interval): generalize some lemmas	.. from a linear ordered field to a linear ordered semifield or a group with zero. --- - [ ] depends on: #23901 - [ ] depends on: #23922 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	192/146	Mathlib/Algebra/Order/Group/Pointwise/Interval.lean	1	5	['eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	3-40265 3 days ago	7-59874 7 days ago	8-8998 8 days
23643	AntoineChambert-Loir author:AntoineChambert-Loir	chore(RingTheory/MvPowerSeries/PiTopology): limit of truncation of power series	Extract a lemma that says that for a multivariate power series, `trunc' R d f` converges to `f` when `d` converges to infinity. Prove the analogous lemma for `MvPowerSeries.trunc` (if the set of indeterminates is nonempty). Move this lemma and the denseness of polynomials to the `PiTopology` file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	44/13	Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/PowerSeries/PiTopology.lean	3	17	['AntoineChambert-Loir', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'pechersky']	nobody	3-40212 3 days ago	3-70862 3 days ago	15-37787 15 days
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	3-37853 3 days ago	277-55733 9 months ago	57-4216 57 days
23951	apnelson1 author:apnelson1	feat(Matroid/Rank): more rank API	We add some more API for matroid rank and its interactions with monotonicity, duality, finiteness and submodularity. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	186/55	Mathlib/Data/Matroid/Rank/ENat.lean,Mathlib/Data/Matroid/Rank/Finite.lean,scripts/noshake.json	3	15	['apnelson1', 'b-mehta', 'github-actions']	b-mehta assignee:b-mehta	3-36360 3 days ago	3-36360 3 days ago	7-46911 7 days
24098	plp127 author:plp127	feat(Topology): R1 separation	Adds a new lemma `r1_separation`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy	7/0	Mathlib/Topology/Separation/Basic.lean	1	1	['github-actions']	nobody	3-29306 3 days ago	3-29588 3 days ago	3-29575 3 days
24054	plp127 author:plp127	feat(Topology): R1 spaces are quasisober	This generalizes `T2Space.quasiSober` --- - [ ] depends on: #24098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	36/8	Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/Sober.lean	3	3	['github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	3-27323 3 days ago	3-27325 3 days ago	1-10067 1 day
24042	eric-wieser author:eric-wieser	feat: add `ULiftable.up'` and `ULiftable.down'`	These are handy when working with `m PUnit` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-meta	10/0	Mathlib/Control/ULiftable.lean	1	1	['github-actions']	nobody	3-24711 3 days ago	4-60500 4 days ago	4-61959 4 days
24094	FR-vdash-bot author:FR-vdash-bot	chore: remove `CanonicallyOrdered{Mul, Add}.toOrderBot`	This will allow us to use `CanonicallyOrdered{Mul, Add}` with order typeclasses that extend `Bot`. Co-authored-by: Peter Nelson <71660771+apnelson1@users.noreply.github.com> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/bot_eq_zero.20in.20complete.20lattice/with/512387701)	t-order t-algebra label:t-algebra$	51/29	Mathlib/Algebra/Order/Antidiag/Prod.lean,Mathlib/Algebra/Order/Group/Finset.lean,Mathlib/Algebra/Order/Monoid/Canonical/Basic.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Order/Ring/Finset.lean,Mathlib/Algebra/Order/Ring/Nat.lean,Mathlib/Algebra/Order/Ring/WithTop.lean,Mathlib/Algebra/Order/SuccPred.lean,Mathlib/Data/DFinsupp/Interval.lean,Mathlib/Data/DFinsupp/Order.lean,Mathlib/Data/Finsupp/Interval.lean,Mathlib/Data/Finsupp/Order.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/WithBot.lean,Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean,Mathlib/SetTheory/Cardinal/Order.lean	16	8	['FR-vdash-bot', 'eric-wieser', 'github-actions', 'leanprover-bot']	nobody	3-24004 3 days ago	3-24004 3 days ago	3-43693 3 days
24103	plp127 author:plp127	feat(Topology/UniformSpace/OfCompactT2): generalize theorem	Generalize `uniformSpaceOfCompactT2` to `uniformSpaceOfCompactR1`. --- - [ ] depends on: #24098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	57/24	Mathlib/Topology/Separation/Basic.lean,Mathlib/Topology/Separation/Regular.lean,Mathlib/Topology/UniformSpace/OfCompactT2.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-22852 3 days ago	3-22854 3 days ago	0-1609 26 minutes
23936	Parcly-Taxel author:Parcly-Taxel	chore: deprecate stub files left over from #20676	As I noted [on Zulip](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2320676.20unbundling.20ordered.20algebra/near/511192094): * `Mathlib/Algebra/Order/Field/InjSurj.lean` (deprecated stuff only) * `Mathlib/Algebra/Order/Group/InjSurj.lean` (ditto) * `Mathlib/Algebra/Order/Group/Instances.lean` (no declarations) * `Mathlib/Algebra/Order/Group/Prod.lean` (ditto) * `Mathlib/Algebra/Order/Group/TypeTags.lean` (ditto)	t-algebra label:t-algebra$	22/42	Mathlib/Algebra/Order/Field/InjSurj.lean,Mathlib/Algebra/Order/Group/InjSurj.lean,Mathlib/Algebra/Order/Group/Instances.lean,Mathlib/Algebra/Order/Group/Prod.lean,Mathlib/Algebra/Order/Group/TypeTags.lean,Mathlib/Algebra/Order/Monoid/Basic.lean,Mathlib/Algebra/Order/Ring/InjSurj.lean	7	3	['Parcly-Taxel', 'github-actions', 'grunweg']	nobody	3-22315 3 days ago	3-25651 3 days ago	8-7234 8 days
24105	urkud author:urkud	feat(Topology/UniformSpace/Path): new file	--- - [ ] depends on: #24066 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	163/52	Mathlib.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Topology/ContinuousMap/Defs.lean,Mathlib/Topology/Order/ProjIcc.lean,Mathlib/Topology/Path.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Mathlib/Topology/UniformSpace/Path.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	3-20528 3 days ago	3-20530 3 days ago	0-927 15 minutes
23767	grunweg author:grunweg	refactor: make library notes a definition	Make library notes a definition of `Unit` type, whose doc-string is the note's content. As a consequence, - doc-gen will display all library notes without any custom logic, - library notes are shown upon hover (via the use of the doc-string), - go do definition for library notes is easy Automate this using a macro, which also enforces that all library notes are inside the Mathlib.LibraryNote namespace. Temporarily, we use the `library_note2` name; if/when the batteries version is changed, we can reclaim the original name. This PR does not address how to refer to library notes nicely (in a way that is shown in the documentation, checked for typos, with sufficient imports ensured etc.). That is left to a future PR. This is proposal 2a from this [zulip discussion]([#mathlib4 > library notes @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/library.20notes/near/510614740)) ------------ Open questions/TODOs: - should this go in batteries instead? can the old definition just be overwritten? - otherwise, what's the best place for the `LibraryNote` definition? A single file just for this feels overkill; I put it in Mathlib.Tactic.Basic for now. I could use Mathlib.Init, of course (but that might be excessive) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	48/48	Archive/Imo/Imo2019Q2.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/Group/Pointwise/Set/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/Scalar.lean,Mathlib/Algebra/Group/Submonoid/Operations.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Order/Hom/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Note.lean,Mathlib/Analysis/RCLike/Lemmas.lean,Mathlib/CategoryTheory/Category/Basic.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Init.lean,Mathlib/Geometry/Manifold/Algebra/Monoid.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Logic/Basic.lean,Mathlib/Tactic/Basic.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/Simps/Basic.lean,Mathlib/Topology/Algebra/Nonarchimedean/Bases.lean,Mathlib/Topology/Continuous.lean	26	8	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	3-17106 3 days ago	3-17106 3 days ago	11-49362 11 days
24093	AntoineChambert-Loir author:AntoineChambert-Loir	feat(RingTheory/MvPowerSeries/NoZeroDivisors): prove order_mul	Prove multiplicativity of order of multivariate power series --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	213/5	Mathlib/Algebra/Order/Monoid/Unbundled/Basic.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean,Mathlib/RingTheory/MvPowerSeries/Order.lean	3	5	['AntoineChambert-Loir', 'github-actions']	nobody	3-6579 3 days ago	3-52240 3 days ago	3-52299 3 days
24056	lecopivo author:lecopivo	feat: fun_prop for ContDiff	Marks `ContDiff/At/On/WithinAt` with `fun_prop` and reformulates certain theorems such they work better with `fun_prop`. In particular - `_id` and `_comp` without using `id` and `Function.comp`. It works with the normal versions but it fails once you start using `fun_prop` as discharger in `simp` as `simp` runs in reducible transparency and can't see through `id` and `Function.comp` as they are `def` - Theorems like `ContDiff.fderiv` are formulated with `m=n+1`. `fun_prop` can't handle the metavariable `?m` when applying such theorem. The reformulation of the theorem just bumps the differentiability by one and the final differentiability is resolved with `ContDiff.of_le`.	t-analysis t-meta	378/191	Mathlib.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Defs.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/ContDiff/WithLp.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/FunctionalSpaces/SobolevInequality.lean,Mathlib/Analysis/SpecialFunctions/Arsinh.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/SmoothTransition.lean,Mathlib/Analysis/SpecialFunctions/Sqrt.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp/ContDiff.lean,MathlibTest/fun_prop2.lean	17	3	['github-actions', 'lecopivo']	nobody	3-6043 3 days ago	3-52216 3 days ago	3-52841 3 days
23768	loefflerd author:loefflerd	feat(Analysis/SpecialFunctions): multipliability lemmas	Prove that in any complete normed ring, a product `∏' i, (1 + f i)` is convergent if the sum of real numbers `∑' i, ‖f i‖` is convergent. As part of this, move some lemmas about summability of logs out of `SpecialFunctions.Log` to `Log.Summable` and rework results in the latter file to minimize non-vanishing / positivity conditions. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	171/71	Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean	2	12	['CBirkbeck', 'github-actions', 'loefflerd']	nobody	3-1076 3 days ago	3-1076 3 days ago	3-1062 3 days
19872	YaelDillies author:YaelDillies	chore(GroupTheory/Index): rename `relindex` to `relIndex`	--- - [x] depends on: #24044 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT awaiting-zulip t-algebra label:t-algebra$	214/137	Mathlib/FieldTheory/Relrank.lean,Mathlib/GroupTheory/Commensurable.lean,Mathlib/GroupTheory/CosetCover.lean,Mathlib/GroupTheory/GroupAction/Blocks.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/IndexNormal.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Schreier.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/FreeModule/Finite/CardQuotient.lean,Mathlib/RingTheory/Ideal/Quotient/Index.lean	13	18	['Ruben-VandeVelde', 'TwoFX', 'YaelDillies', 'alreadydone', 'eric-wieser', 'github-actions', 'leanprover-community-bot-assistant', 'loefflerd', 'madvorak', 'mathlib4-dependent-issues-bot', 'tb65536']	nobody	3-121 3 days ago	3-121 3 days ago	114-79171 114 days
24107	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/Basic): equivalences between stabilizers	Define equivalence between stabilizers. This is concurrent PR to #24039 with a diffferent syntax that fits better my later applications. This one a `MulEquiv`from `stabilizer G a` to `stabilizer G b` associated with `g : G` and an equality `hg : b = g · a`. (The first commit gave the other direction, this one looks preferable.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	93/17	Mathlib/Algebra/Group/End.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean	3	1	['github-actions']	nobody	2-81486 2 days ago	3-2857 3 days ago	3-2912 3 days
24074	ooovi author:ooovi	chore(Probability/Distributions): remove `open Classical ...` from `toMeasure_uniformOfFintype_apply`	Remove `open scoped Classical in` in front of the `toOuterMeasure_uniformOfFintype_apply` and `toMeasure_uniformOfFintype_apply` theorems --- I encountered a hard-to-debug error due to this, leading to the implicit use of the classical `Finset s` instance in the theorem statement, see [the zulip thread](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/coercing.20between.20types.20with.20different.20instances). I hear the removal of the use of the `Classical` namespace for theorem statements is an ongoing project, so feel free to either tell me to remove more occurances e.g. in this file, or defer this PR in favour of the ongoing project.	t-measure-probability delegated	7/7	Mathlib/Probability/Distributions/Uniform.lean	1	4	['eric-wieser', 'github-actions', 'mathlib-bors', 'ooovi']	nobody	2-80983 2 days ago	3-31193 3 days ago	0-47844 13 hours
24092	jt496 author:jt496	feat(Combinatorics/SimpleGraph): add IsCompleteMultipartite definition and related results	A graph is complete multipartite if non-adjacency is transitive. We add this definition, the associated Setoid, and the graph isomorphism to the corresponding completeMultipartiteGraph. We also add the definition of a minimal witness to non-complete-multipartiteness: IsP2Complement. We will need this for our proof of the Andrásfai–Erdős–Sós theorem, where the interesting case is when the graph is not complete-multipartite. Co-authored-by: Lian Tattersall --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	153/0	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/CompleteMultipartite.lean	2	7	['b-mehta', 'github-actions', 'jt496']	nobody	2-79366 2 days ago	2-79960 2 days ago	3-4939 3 days
22039	YaelDillies author:YaelDillies	feat: simproc for computing `Finset.Ixx` of natural numbers	--- - [x] depends on: #22290 - [x] depends on: #22559 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta	315/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/FinsetInterval.lean,Mathlib/Util/Qq.lean	4	58	['FLDutchmann', 'Paul-Lez', 'YaelDillies', 'eric-wieser', 'github-actions', 'kim-em', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	2-78966 2 days ago	2-78984 2 days ago	58-39710 58 days
23903	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): add Submodule.submoduleOf	In this PR we added the definition `Submodule.submoduleOf` and `Submodule.submoduleOfEquivOfLe` as the corrsponding version for `Subgroup.subgroupOf` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	17/0	Mathlib/Algebra/Module/Submodule/Map.lean	1	2	['Thmoas-Guan', 'github-actions']	nobody	2-76313 2 days ago	9-3598 9 days ago	9-3652 9 days
22299	chrisflav author:chrisflav	chore(Order/RelSeries): induction principle for `RelSeries`	Adds many small API lemmas for the transition between `List` and `RelSeries` and an induction principle. Currently, the induction principle is only really useful for proofs, but with a more ambitious refactor of the basic definitions, it could also be used to construct data. Co-authored by: Sihan Su Co-authored by: Yi Song --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	169/0	Mathlib/Data/List/Chain.lean,Mathlib/Order/RelSeries.lean	2	2	['github-actions', 'xyzw12345']	nobody	2-76280 2 days ago	8-24116 8 days ago	42-38988 42 days
23935	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/IsSMulRegular): categorical constructions for IsSMulRegular	The categorical constructions for `IsSMulRegular` for later use related to `Ext` in a separate file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-category-theory label:t-algebra$	58/0	Mathlib.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/RingTheory/Regular/Category.lean	3	16	['Thmoas-Guan', 'github-actions', 'joelriou']	nobody	2-76119 2 days ago	5-557 5 days ago	5-39991 5 days
22881	Champitoad author:Champitoad	feat(CategoryTheory/Topos): add representability results for subobject classifier	We add a section `Representability` at the end of `Mathlib.CategoryTheory.Topos.Classifier` where we formalize the necessary lemmas and definitions that lead to the proof of `CategoryTheory.isRepresentable_hasClassifier_iff`, which states that a category `C` has a subobject classifier if and only if the subobjects presheaf `CategoryTheory.Subobject.presheaf C` is representable (Proposition 1 in Section I.3 of Sheaves in Geometry and Logic [MM92]). The toughest part is found in definition `CategoryTheory.Classifier.fromRepresentation`, which formalizes as closely as possible the argument given in [MM92, pp. 33-34]. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-category-theory	251/22	Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/Presheaf.lean,Mathlib/CategoryTheory/Topos/Classifier.lean	3	21	['Champitoad', 'github-actions', 'joelriou']	nobody	2-75571 2 days ago	16-61312 16 days ago	30-81318 30 days
24112	Vierkantor author:Vierkantor	fix(Algebra): `MulMemClass.mul_mem` should not be `aesop safe`	The `@[aesop safe apply]` attribute only applies to implications that preserve provability. So for `mul_mem (ha : a ∈ s) (hb : b ∈ s) : a * b ∈ s`, there are ways to prove `a * b ∈ s` while `b ∉ s`, such as when `s` is an ideal and `a ∈ s`. So, instead give `MulMemClass.mul_mem` and `AddMemClass.add_mem` the unsafe attribute, and add `Ideal.mul_mem_left` and `Ideal.mul_mem_right` to the aesop with the same `unsafe` attribute. Now we can prove membership of ideals a bit more easily. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	5/1	Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/RingTheory/Ideal/Defs.lean	2	1	['github-actions']	nobody	2-75568 2 days ago	2-75632 2 days ago	2-75619 2 days
24036	Louddy author:Louddy	feat: add `HeightOneSpectrum.ofPrime`	Add a definition relating elements of type `HeightOneSpectrum R` with the (nonzero) prime elements of the monoid with zero `Ideal R`. (Note the distinction between `Prime` and `Ideal.IsPrime`). The documentation string is inspired from [Ideal.prime_iff_isPrime](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/DedekindDomain/Ideal.html#Ideal.prime_iff_isPrime). This was discussed [#mathlib4 > Placing a definition in `DedekindDomain.Ideal` @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Placing.20a.20definition.20in.20.60DedekindDomain.2EIdeal.60/near/511647129). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	11/1	Mathlib/RingTheory/DedekindDomain/Ideal.lean	1	5	['Louddy', 'Ruben-VandeVelde', 'github-actions']	nobody	2-74087 2 days ago	4-73025 4 days ago	4-73083 4 days
23937	unknown author:unknown	feat(Algebra): vanishing of induced hom between ext	unknown description	t-algebra t-category-theory blocked-by-other-PR WIP label:t-algebra$	-1/-1		-1	n/a	None	nobody	2-72857 2 days ago	unknown	unknown
21744	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): admissible lists and simplicial insertion	We introduce the notion of an `m`-admissible list of natural number: a list `[i₀,…,iₙ]` is said to be `m`-admissible if `iₖ ≤ m + k` for all valid index `k`. These lists are intended to uniquely represents either `P_σ` or `P_δ` morphisms in `SimplexCategoryGenRel`. We prove basic stability of such lists under some lists operation such as the tail. We also introduce the notion of simplicial insertion, which is intended to be the algorithm on such normal forms representing composition on the right (for `P_σ` morphisms) or on the left (for `P_δ` morphisms) by a single morphism, and we prove that this preserves admissibility. Part of a series of PR formalising that `SimplexCategoryGenRel` is equivalent to `SimplexCategory`. --- - [x] depends on: #21743 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory	159/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	2	14	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot', 'robin-carlier']	nobody	2-61667 2 days ago	2-61671 2 days ago	52-64781 52 days
23955	Louddy author:Louddy	feat: Ideal.count_associates_eq	Add variant of `UniqueFactorizationMonoid.count_normalizedFactors_eq` for associated Ideals. This is convenient when you need to talk about an element as `a₀ = x ^ n * a`. Note the file is slightly over the 1500 lines limit, I hope that is ok. Co-authored-by: María Inés de Frutos Fernández <[mariaines.dff@gmail.com](mailto:mariaines.dff@gmail.com)> --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	35/1	Mathlib/RingTheory/DedekindDomain/Ideal.lean	1	5	['Louddy', 'Ruben-VandeVelde', 'alreadydone', 'github-actions']	nobody	2-61536 2 days ago	7-59090 7 days ago	7-59150 7 days
24117	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/FixingSubgroup): additivize	Additivize what wasn't. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	24/0	Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean	4	1	['github-actions']	nobody	2-55281 2 days ago	2-58331 2 days ago	2-58387 2 days
24121	smorel394 author:smorel394	feat(RingTheory/Coalgebra/Equiv, RingTheory/Bialgebra/Equiv): constructors for coalgebra and bialgebra equivalences	Add constructors for equivalences of coalgebras and bialgebras, similar to what already exists for equivalences of algebras: - `CoalgEquiv.ofCoalgHom` constructs a `CoalgEquiv` from a `CoalgHom` that has an inverse; - `CoalgEquiv.ofBijective` constructs a `CoalgEquiv` from a bijective `CoalgHom`; - `BialgEquiv.ofBialgHom` constructs a `BialgEquiv` from a `CoalgHom` that has an inverse; - `BialgEquiv.ofBijective` constructs a `BialgEquiv` from a bijective `BialgHom`. Also add some `apply` and `coe` lemmas, following the same model as for `AlgEquiv`s. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	72/0	Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Coalgebra/Equiv.lean	2	1	['github-actions']	nobody	2-52204 2 days ago	2-52493 2 days ago	2-52565 2 days
23293	mans0954 author:mans0954	refactor(Algebra/Polynomial/Roots): nthRoots as a Finset	If `nthRoots n a` is defined as the roots of `(X : R[X]) ^ n - C a` as a multiset then surely `nthRootsFinset n a` should be the roots of `(X : R[X]) ^ n - C a` as a Finset? --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	42/32	Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/RingTheory/Polynomial/Cyclotomic/Basic.lean,Mathlib/RingTheory/RootsOfUnity/PrimitiveRoots.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mans0954', 'urkud']	nobody	2-51503 2 days ago	8-57814 8 days ago	25-304 25 days
23162	mans0954 author:mans0954	feature(Analysis/SpecialFunctions/Complex/Log): exp_mul_I_injOn	$e^{θi}$ is injective on `(-π, π]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	11/0	Mathlib/Analysis/SpecialFunctions/Complex/CircleMap.lean	1	10	['fbarroero', 'github-actions', 'j-loreaux', 'mans0954', 'urkud']	nobody	2-51450 2 days ago	15-50375 15 days ago	13-80534 13 days
23161	mans0954 author:mans0954	feature(Data/Finset/RangeDistance): abs_sub_lt_of_mem_finset_range	The distance between two elements of `Finset.range N` (i.e. absolute value of the difference as integers) is less than `N`. A lemma I found useful for something I was working on, so sharing here in case it's of wider interest. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	30/0	Mathlib.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Data/Finset/RangeDistance.lean	3	3	['fbarroero', 'github-actions']	nobody	2-51402 2 days ago	29-46279 29 days ago	29-46274 29 days
24102	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	142/11	Mathlib.lean,Mathlib/RingTheory/HahnSeries/Addition.lean,Mathlib/RingTheory/HahnSeries/Binomial.lean,Mathlib/RingTheory/HahnSeries/HEval.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,Mathlib/RingTheory/PowerSeries/Binomial.lean	7	1	['github-actions']	nobody	2-48581 2 days ago	3-25166 3 days ago	3-25153 3 days
24119	alreadydone author:alreadydone	feat: preliminaries for Wedderburn–Artin	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	212/116	Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Nullstellensatz.lean,Mathlib/RingTheory/SimpleRing/Congr.lean,Mathlib/RingTheory/SimpleRing/Defs.lean,Mathlib/RingTheory/TwoSidedIdeal/Operations.lean,Mathlib/RingTheory/Unramified/Field.lean	24	1	['github-actions']	nobody	2-45617 2 days ago	2-52696 2 days ago	2-52689 2 days
23963	alreadydone author:alreadydone	feat(RingTheory): isotypic API and Wedderburn–Artin existence	A replacement of #23583 with more meaningful intermediate results. Co-authored-by: Edison Xie @Whysoserioushah Co-authored-by: Jujian Zhang [jujian.zhang19@imperial.ac.uk](mailto:jujian.zhang19@imperial.ac.uk) --- - [ ] depends on: #24119 [![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$	622/143	Mathlib.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Azumaya/Basic.lean,Mathlib/Algebra/Equiv/TransferInstance.lean,Mathlib/Algebra/Lie/Semisimple/Basic.lean,Mathlib/Algebra/Module/Equiv/Basic.lean,Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/Submodule/Ker.lean,Mathlib/Algebra/Ring/CentroidHom.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/GroupTheory/GroupAction/DomAct/Basic.lean,Mathlib/GroupTheory/Perm/DomMulAct.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/Order/Atoms.lean,Mathlib/RingTheory/Congruence/Basic.lean,Mathlib/RingTheory/Ideal/Defs.lean,Mathlib/RingTheory/Jacobson/Ideal.lean,Mathlib/RingTheory/LocalRing/RingHom/Basic.lean,Mathlib/RingTheory/Nullstellensatz.lean,Mathlib/RingTheory/SimpleModule/Basic.lean,Mathlib/RingTheory/SimpleModule/IsAlgClosed.lean,Mathlib/RingTheory/SimpleModule/Isotypic.lean,Mathlib/RingTheory/SimpleModule/WedderburnArtin.lean,Mathlib/RingTheory/SimpleRing/Congr.lean,Mathlib/RingTheory/SimpleRing/Defs.lean,Mathlib/RingTheory/TwoSidedIdeal/Operations.lean,Mathlib/RingTheory/Unramified/Field.lean	32	22	['Whysoserioushah', 'alreadydone', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	2-45609 2 days ago	2-54559 2 days ago	4-62579 4 days
23601	YaelDillies author:YaelDillies	feat(CommAlg): the category of commutative algebras	Define the category of commutative `R`-algebras. This is the same as `Under R` up to two details: * `A : CommAlg R` contains the data of both `algebraMap R A : R → A` and `Algebra.smul : R → A → A`. `A : Under R` only contains `algebraMap R A`, meaning that going back and forth between `Under R` and unbundled algebras is painful/nigh impossible. * If `A : Under R`, then `A` must live in the same universe as `R` 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-algebra awaiting-author label:t-algebra$	320/0	Mathlib.lean,Mathlib/Algebra/Category/CommAlg/Basic.lean	2	22	['YaelDillies', 'b-mehta', 'erdOne', 'eric-wieser', 'github-actions']	nobody	2-42265 2 days ago	2-42265 2 days ago	14-5849 14 days
24108	xroblot author:xroblot	chore(Group/IsCyclic): add a `IsMulCommutative` instance for cyclic groups	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra WIP label:t-algebra$	5/16	Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean	3	7	['github-actions', 'leanprover-bot', 'xroblot']	nobody	2-41130 2 days ago	2-80395 2 days ago	0-8 8 seconds
24064	kim-em author:kim-em	chore: replace `norm_num` with `simp` where applicable	Consider replacing a tactic with a (ahem) simpler alternative. Fairly neutral performance implications, just depends on whether we would like to encourage people to use `simp` where applicable.		346/346	Archive/Examples/MersennePrimes.lean,Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1960Q1.lean,Archive/Imo/Imo1962Q1.lean,Archive/Imo/Imo1962Q4.lean,Archive/Imo/Imo1981Q3.lean,Archive/Imo/Imo1982Q1.lean,Archive/Imo/Imo2001Q2.lean,Archive/Imo/Imo2005Q4.lean,Archive/Imo/Imo2006Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2024Q1.lean,Archive/Imo/Imo2024Q5.lean,Archive/Imo/Imo2024Q6.lean,Archive/Wiedijk100Theorems/AbelRuffini.lean,Archive/Wiedijk100Theorems/CubingACube.lean,Archive/Wiedijk100Theorems/SumOfPrimeReciprocalsDiverges.lean,Counterexamples/Cyclotomic105.lean,Counterexamples/Phillips.lean,Mathlib/Algebra/Field/NegOnePow.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Polynomial/FieldDivision.lean,Mathlib/Algebra/Polynomial/Roots.lean,Mathlib/Algebra/Polynomial/SpecificDegree.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Star/CHSH.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicTopology/DoldKan/Faces.lean,Mathlib/Analysis/Analytic/Inverse.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Basic.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/CStarAlgebra/Module/Defs.lean,Mathlib/Analysis/Calculus/FDeriv/Measurable.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/Function.lean,Mathlib/Analysis/Convolution.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/Fourier/Inversion.lean,Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/InnerProductSpace/NormPow.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/InnerProductSpace/l2Space.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Analysis/MellinInversion.lean,Mathlib/Analysis/Normed/Affine/Simplex.lean,Mathlib/Analysis/Normed/Algebra/TrivSqZeroExt.lean,Mathlib/Analysis/Normed/Group/ControlledClosure.lean,Mathlib/Analysis/Normed/Lp/lpSpace.lean,Mathlib/Analysis/Normed/Operator/Banach.lean,Mathlib/Analysis/Normed/Ring/Units.lean,Mathlib/Analysis/NormedSpace/HahnBanach/Separation.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/NormedSpace/RieszLemma.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Isometric.lean,Mathlib/Analysis/SpecialFunctions/ExpDeriv.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deligne.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Complex.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Inverse.lean,Mathlib/Combinatorics/Additive/AP/Three/Behrend.lean,Mathlib/Combinatorics/Additive/SmallTripling.lean,Mathlib/Combinatorics/Extremal/RuzsaSzemeredi.lean,Mathlib/Combinatorics/SimpleGraph/Density.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Bound.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Increment.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Lemma.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Triangle/Counting.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/DFA.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Complex/Trigonometric.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Nat/Choose/Sum.lean,Mathlib/Data/Nat/Digits.lean,Mathlib/Data/Nat/Prime/Defs.lean,Mathlib/Data/Real/GoldenRatio.lean,Mathlib/Data/Real/Pi/Bounds.lean	172	7	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	2-34405 2 days ago	2-34405 2 days ago	4-14501 4 days
24127	DavidLedvinka author:DavidLedvinka	feat(MeasureTheory/Measure/WithDensity): density of product of measures	Add a lemma which states that the density of the product of measures is given by the product of the densities.	new-contributor t-measure-probability	29/1	Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/MeasureTheory/Measure/WithDensity.lean	3	1	['github-actions']	nobody	2-33766 2 days ago	2-33777 2 days ago	2-33840 2 days
24016	plp127 author:plp127	feat: fine uniformity	Adds the fine uniformity, and proves some properties. --- - [ ] depends on: #24096 for showing the induced topology is equal on completely regular spaces [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	2-28872 2 days ago	2-28874 2 days ago	2-85349 2 days
23721	YaelDillies author:YaelDillies	chore: rename `AlgebraCat` to `Alg`	and its friends too. The new names: * are shorter * match `Grp`, `CommGrp` * are what people would write on paper The existing name is too much of a mouthful to be usefully included in declaration names. For example, [`BialgebraCat.hasForgetToAlgebra`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Algebra/Category/BialgebraCat/Basic.html#BialgebraCat.hasForgetToAlgebra) wasn't named `BialgebraCat.hasForgetToAlgebraCat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip t-algebra awaiting-author label:t-algebra$	433/433	Mathlib.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/BrauerGroup/Defs.lean,Mathlib/Algebra/Category/Alg/Basic.lean,Mathlib/Algebra/Category/Alg/Limits.lean,Mathlib/Algebra/Category/Alg/Monoidal.lean,Mathlib/Algebra/Category/Alg/Symmetric.lean,Mathlib/Algebra/Category/AlgebraCat/Symmetric.lean,Mathlib/Algebra/Category/Bialg/Basic.lean,Mathlib/Algebra/Category/Bialg/Monoidal.lean,Mathlib/Algebra/Category/Coalg/Basic.lean,Mathlib/Algebra/Category/Coalg/ComonEquivalence.lean,Mathlib/Algebra/Category/Coalg/Monoidal.lean,Mathlib/Algebra/Category/HopfAlg/Basic.lean,Mathlib/Algebra/Category/HopfAlg/Monoidal.lean,Mathlib/Algebra/Category/Ring/Under/Basic.lean,Mathlib/CategoryTheory/Monoidal/Hopf_.lean,Mathlib/CategoryTheory/Monoidal/Internal/Limits.lean,Mathlib/CategoryTheory/Monoidal/Internal/Module.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean,Mathlib/LinearAlgebra/CliffordAlgebra/CategoryTheory.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Monoidal.lean,Mathlib/LinearAlgebra/QuadraticForm/QuadraticModuleCat/Symmetric.lean,Mathlib/RingTheory/Coalgebra/TensorProduct.lean,Mathlib/RingTheory/HopfAlgebra/Basic.lean,MathlibTest/CategoryTheory/ConcreteCategory/Alg.lean,docs/overview.yaml	27	8	['YaelDillies', 'b-mehta', 'erdOne', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	nobody	2-24586 2 days ago	2-24586 2 days ago	10-35940 10 days
23299	DavidLedvinka author:DavidLedvinka	feat(Analysis): add `mlconvolution` and `lconvolution`, Convolution with the Lebesgue integral	Create LConvolution.lean which defines convolution using the Lebesgue integral. I plan to add more API but wanted to make sure the definition/notation are satisfactory. The main intended application of this is to prove that the pdf of a product (sum) of independent random variables is given by the convolution of their pdfs.	new-contributor t-measure-probability t-analysis	125/43	Mathlib.lean,Mathlib/Analysis/LConvolution.lean,Mathlib/MeasureTheory/Group/Convolution.lean,Mathlib/Tactic/ToAdditive/Frontend.lean	4	23	['DavidLedvinka', 'EtienneC30', 'github-actions', 'leanprover-community-bot-assistant', 'urkud']	EtienneC30 assignee:EtienneC30	2-15329 2 days ago	2-15344 2 days ago	24-18245 24 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	2-5080 2 days ago	2-5080 2 days ago	0-0 0 seconds
23778	xyzw12345 author:xyzw12345	feat(RingTheory/Ideal/Height): Krull height theorem	In this PR, we continue to port @erdOne 's lean3 repository at [here](https://github.com/erdOne/lean-AG-morphisms), and (finally!) finished the result of Krull's height theorem. This PR is a refactor of #22403 where the code diverged from upstream due to newly merged PRs. Co-authored-by: Andrew Yang @erdOne Wanyi He @Blackfeather007 <2100017455@stu.pku.edu.cn> Shouxin Zhang @ShouxinZhang <202013140018@nuist.edu.cn> Jiedong Jiang @jjdishere --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra awaiting-author label:t-algebra$	375/0	Mathlib.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/Finiteness/Ideal.lean,Mathlib/RingTheory/HopkinsLevitzki.lean,Mathlib/RingTheory/Ideal/Height.lean,Mathlib/RingTheory/Ideal/KrullsHeightTheorem.lean,Mathlib/RingTheory/Ideal/MinimalPrime/Localization.lean,Mathlib/RingTheory/KrullDimension/Zero.lean,Mathlib/RingTheory/Localization/Submodule.lean,docs/1000.yaml	11	51	['erdOne', 'github-actions', 'meithecatte', 'xyzw12345']	nobody	2-1810 2 days ago	9-5376 9 days ago	2-63256 2 days
21493	mans0954 author:mans0954	feat(Order): directed products and upper bounds	A collection of lemmas building to `Monotone.upperBounds_image_of_directedOn_prod` - the upper bounds of the image of a directed product space coincide with the upper bounds of the image of the product of the components. Used in #15412. I have also included `lowerBounds` lemmas where appropriate for completeness. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	76/0	Mathlib.lean,Mathlib/Data/Set/Defs.lean,Mathlib/Data/Set/Prod.lean,Mathlib/Order/Bounds/Basic.lean,Mathlib/Order/Bounds/Extra.lean	5	15	['YaelDillies', 'github-actions', 'mans0954']	nobody	2-703 2 days ago	9-34487 9 days ago	48-28812 48 days
23637	kirilvino author:kirilvino	feat(Combinatorics/SimpleGraph): every circuit contains a cycle proof	circuit to cycle proof --- This PR uses the bypass definition in a new function for closed walks that removes repeated vertices. Then proves if the closed walk given is a circuit, that the result from this function is a cycle. This is then packaged up similar to the existing ToPath definition, creating a way of transforming a circuit into a cycle. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics awaiting-author	26/0	Mathlib/Combinatorics/SimpleGraph/Path.lean	1	8	['b-mehta', 'github-actions', 'kirilvino']	nobody	1-80739 1 day ago	2-40960 2 days ago	13-19789 13 days
23918	RemyDegenne author:RemyDegenne	feat: Peano form of Taylor's theorem	Co-authored-by: Tian Chen (@peakpoint) --- Extracted from #19796 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	141/1	Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Convex/Topology.lean,Mathlib/Analysis/Normed/Module/Convex.lean,Mathlib/Topology/Algebra/Module/LocallyConvex.lean	5	5	['github-actions', 'mathlib-bors', 'sgouezel']	nobody	1-79830 1 day ago	1-79830 1 day ago	8-69065 8 days
23988	RemyDegenne author:RemyDegenne	feat(MeasureTheory): `tendsto_iff_forall_integral_rclike_tendsto`	Add variants of `tendsto_iff_forall_integral_tendsto` for finite measures and probability measures, where the integral is over functions with value in an RCLike type instead of Real. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability ready-to-merge	52/0	Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean	4	2	['github-actions', 'sgouezel']	nobody	1-79176 1 day ago	1-79881 1 day ago	4-9076 4 days
24135	madvorak author:madvorak	chore(Data/Matrix/Def): `Matrix.submatrix` naming convention	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	11/11	Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Defs.lean	2	1	['github-actions']	nobody	1-75547 1 day ago	1-75554 1 day ago	1-75610 1 day
22779	xroblot author:xroblot	feat(NumberField/CanonicalEmbedding/NormLeOne): prove that the frontier of `normLeOne` has zero-volume	This is the last PR about `normLeOne K`. We prove that it is a bounded set and that its frontier has volume zero. This PR is part of the proof of the Analytic Class Number Formula. --- - [x] depends on: #22777 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	214/1	Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-74788 1 day ago	2-61336 2 days ago	2-61739 2 days
24137	xroblot author:xroblot	feat(NumberField): add `ComplexEmbedding.lift`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	19/3	Mathlib/NumberTheory/NumberField/Embeddings.lean	1	1	['github-actions']	nobody	1-73137 1 day ago	1-74895 1 day ago	1-74956 1 day
24015	alreadydone author:alreadydone	feat(RingTheory): lemmas on finiteness of `LinearMap` and `Module.End`	--- One less lemma than #24012, but with the advantage of not depending on #23963. - [x] depends on: #24115 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	91/32	Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/Projection.lean,Mathlib/RingTheory/Finiteness/Basic.lean,Mathlib/RingTheory/SimpleModule/Basic.lean	7	9	['alreadydone', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mathlib4-dependent-issues-bot']	nobody	1-71458 1 day ago	1-71458 1 day ago	4-78583 4 days
24140	mattrobball author:mattrobball	test			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	4	['github-actions', 'leanprover-bot', 'mattrobball']	nobody	1-68477 1 day ago	1-70178 1 day ago	0-0 0 seconds
23974	fbarroero author:fbarroero	fix: change file name for consistency	We change the name of the file `Mathlib.Algebra.Polynomial.ofFn` to `Mathlib.Algebra.Polynomial.OfFn` for consistency. For instance, the file containing `List.ofFn` is called `Init.Data.List.OfFn`. Zulip discussion [here](https://leanprover.zulipchat.com/#narrow/channel/144837-PR-reviews/topic/.2323974.20Change.20file.20name.20to.20CamelCase/with/512739476) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-zulip easy	1/1	Mathlib.lean,Mathlib/Algebra/Polynomial/OfFn.lean	2	3	['github-actions', 'grunweg', 'riccardobrasca']	nobody	1-65726 1 day ago	2-2885 2 days ago	4-60671 4 days
24142	joelriou author:joelriou	feat(CategoryTheory): left derived functors	The definitions in the file `CategoryTheory.Functor.Derived.RightDerived` are dualized in order to define left derived functors. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	213/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean	2	1	['github-actions']	nobody	1-64395 1 day ago	1-64460 1 day ago	1-64447 1 day
24122	apnelson1 author:apnelson1	feat(Combinatorics): multigraphs	This PR defines multigraphs via a structure `Graph a b` consisting of a vertex set, an edge set, and a 'binary incidence' predicate describing which edges are incident with which vertices. The definition uses the same 'embedded set' design as `Matroid`: the vertex and edge sets are modelled as `Set`s rather than types. We give basic API for incidence, adjacency and extensionality. [Zulip discussion.](https://leanprover.zulipchat.com/#narrow/stream/144837-PR-reviews/topic/.2324122.20Multigraphs) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	291/0	Mathlib.lean,Mathlib/Combinatorics/Graph/Basic.lean,scripts/noshake.json	3	12	['Parcly-Taxel', 'apnelson1', 'b-mehta', 'github-actions', 'kmill', 'madvorak']	nobody	1-62076 1 day ago	2-51634 2 days ago	2-51694 2 days
23909	grunweg author:grunweg	chore: various fixes for the flexible linter	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		120/85	Mathlib/Condensed/Light/Epi.lean,Mathlib/Control/EquivFunctor/Instances.lean,Mathlib/Control/Monad/Cont.lean,Mathlib/Data/FinEnum.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/List/Sigma.lean,Mathlib/Data/List/SplitBy.lean,Mathlib/Data/Matroid/Sum.lean,Mathlib/Data/Ordmap/Invariants.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Vector3.lean,Mathlib/Data/WSeq/Relation.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Goursat.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/NumberTheory/Dioph.lean,Mathlib/NumberTheory/FLT/Polynomial.lean,Mathlib/NumberTheory/LSeries/Injectivity.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/Probability/Kernel/Condexp.lean,Mathlib/RingTheory/Derivation/MapCoeffs.lean,Mathlib/RingTheory/Frobenius.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/ZFC/Rank.lean,Mathlib/Tactic/NormNum/NatFactorial.lean	30	8	['b-mehta', 'github-actions', 'grunweg']	nobody	1-60480 1 day ago	8-82367 8 days ago	8-82353 8 days
24049	YaelDillies author:YaelDillies	refactor(ChosenFiniteProducts): don't make finite-product-preserving functors monoidal	Instead, reprove all the theorems about finite-product-preserving functors under the appropriate `LaxMonoidal`/ `OplaxMonoidal`/`Monoidal` assumptions. Also take the opportunity to sort the file slightly, correct docstrings and a few names. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory awaiting-author	117/119	Mathlib/Algebra/Category/Grp/ChosenFiniteProducts.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/CategoryTheory/ChosenFiniteProducts.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean	6	4	['YaelDillies', 'erdOne', 'github-actions']	nobody	1-59589 1 day ago	1-59589 1 day ago	2-20573 2 days
24109	grunweg author:grunweg	feat(Tactic/Linter/DirectoryDependency): use an allow-list for selected directories' imports	Follow-up to #23088. This seems to work well enough. (For robustness, a collection of further tests would be rather welcome --- but that is pre-existing.) --- Open question: instead of manually filtering for imports of external projects, should I instead just lint only mathlib imports? Future work: investigate converting further directories --- perhaps Mathlib.Data? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter awaiting-CI	185/69	Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/Header.lean,MathlibTest/Header.lean,scripts/lint-style.lean	4	1	['github-actions']	nobody	1-56757 1 day ago	2-52830 2 days ago	0-26721 7 hours
24144	joelriou author:joelriou	feat(CategoryTheory): the derived adjunction between absolute derived functors	An adjunction between functors induces an adjunction between the corresponding left/right derived functors, when these derived functors are absolute, i.e. they remain derived functors after the post-composition with any functor. This theorem is the generalized version by Georges Maltsiniotis (Le théorème de Quillen, d'adjonction des foncteurs dérivés, revisité, C. R. Math. Acad. Sci. Paris 344 (2007), no. 9) of a theorem by Quillen for adjunctions between model categories. --- - [ ] depends on: #24142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory blocked-by-other-PR WIP	384/0	Mathlib.lean,Mathlib/CategoryTheory/Functor/Derived/Adjunction.lean,Mathlib/CategoryTheory/Functor/Derived/LeftDerived.lean,docs/references.bib	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-56090 1 day ago	1-56998 1 day ago	0-0 0 seconds
24141	loefflerd author:loefflerd	feat(NumberTheory/Padics): parametrization of cts add chars of Z_[p]	Another step towards defining the Mahler / Amice transform for p-adic measures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory	108/0	Mathlib.lean,Mathlib/NumberTheory/Padics/AddChar.lean	2	1	['github-actions']	nobody	1-55152 1 day ago	1-64734 1 day ago	1-64733 1 day
24134	sgouezel author:sgouezel	feat: drop measurability assumption in `norm_setIntegral_le_of_norm_le_const_ae'`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-measure-probability	46/47	Mathlib/Analysis/Fourier/RiemannLebesgueLemma.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/MeasureTheory/Integral/Bochner/FundThmCalculus.lean,Mathlib/MeasureTheory/Integral/Bochner/Set.lean,Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Integral/IntervalIntegral/Basic.lean,Mathlib/MeasureTheory/Integral/TorusIntegral.lean,Mathlib/NumberTheory/Transcendental/Lindemann/AnalyticalPart.lean	8	3	['Ruben-VandeVelde', 'github-actions', 'grunweg']	nobody	1-54335 1 day ago	1-54336 1 day ago	1-79779 1 day
22576	Ruben-VandeVelde author:Ruben-VandeVelde	feat: more lemmas about alternatingGroup	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) cc @AntoineChambert-Loir (whose code this is)	maintainer-merge t-algebra label:t-algebra$	55/0	Mathlib/GroupTheory/SpecificGroups/Alternating/Centralizer.lean	1	4	['b-mehta', 'github-actions']	nobody	1-50556 1 day ago	1-53347 1 day ago	45-33760 45 days
23018	gio256 author:gio256	feat: subscript and superscript delaborators	We add the functions `delabSubscript` and `delabSuperscript` in the `Mathlib.Tactic` namespace. These delaborators are triggered only if the entirety of the provided expression can be subscripted (respectively, superscripted). The delaborators are not exhaustive, in that they will not successfully delaborate every expression that is valid in a subscript or superscript. We instead aim to make them overly conservative, so that any expression which is successfully delaborated must be subscriptable (or superscriptable). --- This PR is intended to serve as a predecessor to #20719. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos maintainer-merge t-meta	206/10	Mathlib/Util/Superscript.lean,MathlibTest/superscript.lean	2	36	['eric-wieser', 'gio256', 'github-actions', 'joneugster']	nobody	1-47586 1 day ago	1-48796 1 day ago	30-50754 30 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 - [ ] depends on: #23018 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	infinity-cosmos t-category-theory t-meta blocked-by-other-PR	540/41	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	22	['eric-wieser', 'gio256', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot']	eric-wieser assignee:eric-wieser	1-47046 1 day ago	17-51126 17 days ago	8-71562 8 days
24138	smorel394 author:smorel394	feat(RingTheory/Bialgebra/Basic): injectivity of `algebraMap` and nontriviality of bialgebras	If `A` is a bialgebra over a commutative semiring `R`, prove that `algebraMap R A` is injective. Deduce that `A` is nontrivial if `R` is nontrivial. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-algebra label:t-algebra$	17/0	Mathlib/RingTheory/Bialgebra/Basic.lean	1	1	['github-actions']	nobody	1-45572 1 day ago	1-74252 1 day ago	1-74256 1 day
21765	101damnations author:101damnations	feat(RepresentationTheory/GroupCohomology/LongExactSequence): specialise LES API to low degree group cohomology	Given a commutative ring `k` and a group `G`, this file shows that a short exact sequence of `k`-linear `G`-representations `0 ⟶ X₁ ⟶ X₂ ⟶ X₃ ⟶ 0` induces a short exact sequence of complexes of inhomogeneous cochains `0 ⟶ C(X₁) ⟶ C(X₂) ⟶ C(X₃) ⟶ 0`, where `Hⁿ(C(Xᵢ))` is the `n`th group cohomology of `Xᵢ`. This allows us to specialize API about long exact sequences to group cohomology; in this PR we focus on degrees `n = 0, 1, 2`. --- - [x] depends on: #21652 - [x] depends on: #21739 - [x] depends on: #21756 - [x] depends on: #21758 - [ ] depends on: #21760 [![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$	455/27	Mathlib.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/LinearAlgebra/Pi.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/LongExactSequence.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-42473 1 day ago	1-42473 1 day ago	0-309 5 minutes
22974	YaelDillies author:YaelDillies	refactor: use a junk value for the analytic order of a non-analytic function	Currently, the order of an analytic function is called `AnalyticAt.order` and has a single explicit argument `hf : AnalyticAt 𝕜 f z₀`. This means that working with analytic functions results in contexts full of `hf.order` or, worse, `⋯.order`. This PR makes the `f` and `z₀` arguments explicit, and drops the `hf` one by introducing a junk value of `0` for non-analytic functions. The resulting function is called `eanalyticOrderAt` and I am also adding a `Nat`-valued version `analyticOrderAt` since `(eanalyticOrderAt f z₀).toNat` was appearing in quite a few lemmas. --- The same change could be performed for meromorphic functions once you are convinced. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	187/101	Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/Meromorphic/NormalForm.lean,Mathlib/Analysis/Meromorphic/Order.lean,Mathlib/Data/ENat/Basic.lean	4	7	['YaelDillies', 'github-actions', 'loefflerd', 'urkud']	nobody	1-42454 1 day ago	16-64661 16 days ago	31-25975 31 days
22142	smmercuri author:smmercuri	feat: collections of non-trivial and pairwise inequivalent absolute values contain values that diverge around 1	The main result of this PR is that for a collection $v_1, ..., v_k$ of at least two non-trivial and pairwise inequivalent absolute values on a field $F$, there is an $a ∈ F$ such that $1 < v_1(a)$ while $v_j a < 1$ for all other $j ≠ 1$. --- - [ ] depends on: #22100 - [x] depends on: #22116 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis blocked-by-other-PR label:t-algebra$	380/1	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-42303 1 day ago	1-42303 1 day ago	0-616 10 minutes
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-algebraic-geometry	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	2	['JovanGerb', 'github-actions']	nobody	1-42287 1 day ago	1-42287 1 day ago	17-65755 17 days
22582	vlad902 author:vlad902	feat: generalize theorems with linter fixes	This is one of a series of PRs that generalizes type classes across Mathlib. These are generated using a new linter that tries to re-elaborate theorem definitions with more general type classes to see if it succeeds. It will accept the generalization if deleting the entire type class causes the theorem to fail to compile. Otherwise, the type class is not being generalized, but can simply be replaced by implicit type class synthesis (or an implicit type class in a variable block being pulled in.) The linter currently output debug statements indicating source file positions where type classes should be generalized, and a script then makes those edits. This file contains a subset of those generalizations. The linter and the script performing re-writes is available in commit 7b436512017640c3c33aea50b2435b2ee0d995c9. Note that this PR specifically generalizes theorems across a range of files and type classes, the common theme is that the resulting changes all cause type classes in variable declarations to go unused. Also see discussion on Zulip here: https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Elab.20to.20generalize.20type.20classes.20for.20theorems/near/498862988 https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Elab.20to.20generalize.20type.20classes.20for.20theorems/near/501288855	new-contributor t-algebra t-analysis label:t-algebra$	30/50	Mathlib.lean,Mathlib/Algebra/Algebra/Basic.lean,Mathlib/Algebra/Group/Action/Faithful.lean,Mathlib/Algebra/GroupWithZero/Action/Faithful.lean,Mathlib/Analysis/Convex/Segment.lean,Mathlib/Analysis/Normed/Operator/Compact.lean,Mathlib/GroupTheory/Perm/Subgroup.lean,Mathlib/Topology/Algebra/ConstMulAction.lean	8	11	['github-actions', 'urkud', 'vlad902']	urkud assignee:urkud	1-42249 1 day ago	1-42249 1 day ago	44-23184 44 days
23758	erdOne author:erdOne	feat(Topology/Algebra): linearly topologized iff non-archimedian	...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 label:t-algebra$	138/3	Mathlib/LinearAlgebra/Span/Basic.lean,Mathlib/Topology/Algebra/LinearTopology.lean	2	20	['ADedecker', 'AntoineChambert-Loir', 'erdOne', 'github-actions']	nobody	1-42209 1 day ago	1-42209 1 day ago	12-4630 12 days
22300	chrisflav author:chrisflav	feat(RingTheory/GoingDown): lift `LTSeries` of primes	Inductive version of `Ideal.exists_ideal_lt_liesOver_of_lt`. Co-authored by: Sihan Su Co-authored by: Yi Song --- - [ ] depends on: #22299 [![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$	196/0	Mathlib/Data/List/Chain.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/GoingDown.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41860 1 day ago	1-41860 1 day ago	0-848 14 minutes
23877	Thmoas-Guan author:Thmoas-Guan	feat(RingTheory/Ideal): finiteness of associated primes	We proved the finiteness of associated primes for finitely generated modules over notherian ring. Co-authored-by: Wang Jingting Co-authored-by: Huanyu Zheng @Yu-Misaka Co-authored-by: Weichen Jiao @AlbertJ-314 --- - [ ] depends on: #22299 - [ ] depends on: #23876 [![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$	662/2	Mathlib.lean,Mathlib/Data/List/Chain.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41850 1 day ago	1-41850 1 day ago	1-34721 1 day
23934	Thmoas-Guan author:Thmoas-Guan	feat(Algebra): hom subsingleton iff exist smul regular in ann	In this PR, we proved that for `R` modules `M N`, `Hom(N,M)` is subsingleton iff there exist `r : R`, `IsSMulRegular M r` and `r ∈ ann(N)`. This is the case for `Depth[I](M) = 0`. Co-authored by: Yi Song --- - [ ] depends on: #23877 [![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$	854/2	Mathlib.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/Data/List/Chain.lean,Mathlib/Order/RelSeries.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41844 1 day ago	1-41844 1 day ago	0-1315 21 minutes
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	1-41297 1 day ago	130-62870 4 months ago	140-50519 140 days
22792	madvorak author:madvorak	feat(Mathlib/Data/Fin/Pigeonhole): pigeonhole-like results for Fin	Consider the following settings: ``` import Mathlib example (X Y : Type) [Fintype X] [Fintype Y] (f : X → Y) (hf : f.Injective) : Fintype.card X ≤ Fintype.card Y := by hint example (m n : ℕ) (f : Fin m → Fin n) (hf : f.Injective) : m ≤ n := by hint example (X Y : Type) [Fintype X] [Fintype Y] (f : X ↪ Y) : Fintype.card X ≤ Fintype.card Y := by hint example (m n : ℕ) (f : Fin m ↪ Fin n) : m ≤ n := by hint ``` The 1st and 3rd `hint` succeed, but the 2nd a 4th `hint` fail. The problem is obviously that `exact?` does not see through `Fintype.card (Fin n) = n` when searching for appropriate lemma. It may seem to not be a problem, as it will rarely derail experienced Mathlib users — after all, experienced Leaners usually go directly for the `Finset` or `Fintype` version. However, beginners frequently work with `Fin` and they will expect stuff like ``` theorem le_of_injective (f : Fin m → Fin n) (hf : f.Injective) : m ≤ n ``` to exist; therefore, when `hint` or `exact?` fails, it is a very unpleasant surprise. This PR addressed this issue; not to provide useful content for advanced users, but to make Mathlib more useful for beginners. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	38/0	Mathlib.lean,Mathlib/Data/Fin/Pigeonhole.lean	2	1	['github-actions']	nobody	1-41259 1 day ago	39-59594 1 month ago	39-59649 39 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/)	new-contributor t-analysis awaiting-author WIP help-wanted	411/0	Mathlib/PlaceHolder/ToeplitzHausdorff.lean,Mathlib/PlaceHolder/ToeplitzHausdorff_v2.lean	2	10	['faenuccio', 'ggranberry', 'github-actions']	faenuccio assignee:faenuccio	1-41137 1 day ago	1-41137 1 day ago	4-24257 4 days
23677	upobir author:upobir	feat(Mathlib/RingTheory/Int/Basic): add eq_pow_of_mul_eq_pow for Nat	--- This pr adds theorems analogous to [Int.sq_of_isCoprime](https://leanprover-community.github.io/mathlib4_docs/Mathlib/RingTheory/Int/Basic.html#Int.sq_of_isCoprime), but with generic power and both left and right versions. I had asked in [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Nat.20and.20left.2C.20right.20version.20of.20Int.2Esq_of_isCoprime) before to make sure this theorem was missing. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	20/3	Mathlib/RingTheory/Int/Basic.lean	1	1	['github-actions']	nobody	1-41067 1 day ago	14-47010 14 days ago	14-47069 14 days
23844	pechersky author:pechersky	feat(CI): build gitpod container in github CI	And push to ghcr.io --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	CI	64/0	.github/workflows/docker_build.yml	1	9	['bryangingechen', 'github-actions', 'pechersky']	nobody	1-41032 1 day ago	10-46754 10 days ago	10-46810 10 days
8691	urkud author:urkud	feat(Analysis/NormedSpace): add `NormedSpace.Alternating`	--- - [x] depends on: #19445 - [x] depends on: #19422 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis awaiting-author	632/11	Mathlib.lean,Mathlib/Analysis/NormedSpace/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Basic.lean,Mathlib/Topology/Algebra/Module/Alternating/Topology.lean	4	47	['eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	1-40556 1 day ago	3-20238 3 days ago	0-7433 2 hours
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 awaiting-author	3/3	.github/build.in.yml,.github/workflows/actionlint.yml	2	11	['adomani', 'bryangingechen', 'github-actions', 'jcommelin']	bryangingechen assignee:bryangingechen	1-40384 1 day ago	1-40384 1 day ago	0-0 0 seconds
23021	101damnations author:101damnations	feat(Data/Finsupp/Basic): add `Finsupp.(un)curry_single` and `@[simps]` to `Finsupp.finsuppProd(L)Equiv`	--- This was raised by @Whysoserioushah regarding #21732. Adding the lemmas and `@[simps]` on their own breaks [this lemma](https://github.com/leanprover-community/mathlib4/blob/eab98761167237d45662033394ebd5ee28613aac/Mathlib/RingTheory/AlgebraTower.lean#L124) and the simplest way to fix it (and justify removing `Finsupp.finsuppProdLEquiv_symm_apply`) is to make the argument to `Finsupp.uncurry_apply_pair` (added in #22939) any term of the product type, but maybe that would be too eager a simp lemma? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	15/14	Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean	2	1	['github-actions']	nobody	1-38011 1 day ago	1-38011 1 day ago	32-46331 32 days
22100	smmercuri author:smmercuri	feat: two inequivalent absolute values have a `< 1` and `> 1` value	- Two absolute values `v` and `w` are equivalent if and only if `v x < 1` exactly when `w x < 1` - Two inequivalent absolute values `v` and `w` have a point `x` at which `1 < v x` and `w x < 1` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis label:t-algebra$	174/0	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean	2	6	['Paul-Lez', 'github-actions', 'smmercuri']	nobody	1-38001 1 day ago	1-38001 1 day ago	32-25350 32 days
23926	b-reinke author:b-reinke	feat(Algebra/BigOperators/Finprod): add powerset projection lemmas	This PR adds lemmas in `Mathlib/Algebra/BigOperators/Finprod.lean` related to products/sums over the powerset `𝒫 s` when we add or remove an element of `s`. We also add the lemmas `mul_finsum_mem` and `finsum_mem_mul`, the analogues of `mul_finsum` and `finsum_mul` for sums over a subset The motivation comes from the proof of the deletion/contraction properties of matroids. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	38/0	Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Data/Set/Image.lean	2	3	['b-reinke', 'eric-wieser', 'github-actions']	nobody	1-37951 1 day ago	1-37951 1 day ago	8-37557 8 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	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	1	['github-actions']	nobody	1-37942 1 day ago	1-37942 1 day ago	3-29472 3 days
23938	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: #23937 - [ ] depends on: #23934 [![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$	1472/54	Mathlib.lean,Mathlib/Algebra/Category/Grp/Preadditive.lean,Mathlib/Algebra/Category/ModuleCat/EnoughInjectives.lean,Mathlib/Algebra/Category/ModuleCat/Projective.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/HasEnoughProjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/LocalCohomology.lean,Mathlib/Algebra/Module/FinitePresentation.lean,Mathlib/CategoryTheory/Abelian/Projective/Dimension.lean,Mathlib/Data/List/Chain.lean,Mathlib/Order/RelSeries.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Finiteness.lean,Mathlib/RingTheory/Regular/Category.lean,Mathlib/RingTheory/Regular/Depth.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean,scripts/nolints_prime_decls.txt	20	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-37934 1 day ago	unknown	unknown
23986	ShouxinZhang author:ShouxinZhang	feat(FieldTheory/RatFunc): add RatFunc.toFractionRingAlgEquiv	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	will-close-soon t-algebra label:t-algebra$	17/0	Mathlib/FieldTheory/RatFunc/Basic.lean	1	1	['joneugster']	nobody	1-37911 1 day ago	1-37911 1 day ago	0-0 0 seconds
23530	YaelDillies author:YaelDillies	feat(.devcontainer): use prebuilt Docker image	... instead of building it every time we open a codespace. This makes opening a codespace much faster. The image can be found here: https://hub.docker.com/r/leanprovercommunity/gitpod4. I am the one maintaining it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge CI	1/3	.devcontainer/devcontainer.json	1	3	['github-actions', 'joneugster']	nobody	1-37520 1 day ago	1-37520 1 day ago	17-79633 17 days
23549	bryangingechen author:bryangingechen	chore: make dependabot group updates into a single PR	cf. docs at https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/optimizing-pr-creation-version-updates --- It was a bit annoying to make a single bors batch for [#23544](https://github.com/leanprover-community/mathlib4/pull/23544) [#23543](https://github.com/leanprover-community/mathlib4/pull/23543) [#23541](https://github.com/leanprover-community/mathlib4/pull/23541) [#23540](https://github.com/leanprover-community/mathlib4/pull/23540).	CI delegated	10/0	.github/dependabot.yml	1	5	['adomani', 'github-actions', 'joneugster', 'mathlib-bors']	nobody	1-36849 1 day ago	1-36849 1 day ago	16-27325 16 days
11968	JovanGerb author:JovanGerb	feat: improvements to RefinedDiscrTree	This PR defines `RefinedDiscrTree`, which is an improved version of `DiscrTree` with many new features, such as - indexing lambda terms, dependent forall terms, and bound variables. - giving a score to matches, in order to sort them - indexing star patterns so that `a+b` and `a+a` are indexed differently - taking into account eta reductions, so that `exp` can still be matched with the library pattern `fun x => exp (f x)`. This PR makes `RefinedDiscrTree` into a lazy data structure, meaning that it can be used without a cache, just like `LazyDiscrTree`. This PR also removes these features: - indexing `fun x => x` as `id` - indexing `fun x => f x + g x` as `f + g`, and similarly for `-`, `*`, `/`, `⁻¹`, `^`. - indexing `fun _ => 42` as `42` These equivalent indexings do not hold definitionally in the `reducible` transparency, which is the transparency that is used for unification when using a discrimination tree. Therefore, indexing these different expressions the same is actually inefficient rather than helpful. This is part of the bigger #11768, which uses this discrimination tree for a library rewriting tactic. This replaces an older version of `RefinedDiscrTree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta	1631/1242	Mathlib.lean,Mathlib/Lean/Meta/RefinedDiscrTree.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Initialize.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/StateList.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Topology/Defs/Basic.lean,MathlibTest/RefinedDiscrTree.lean,scripts/noshake.json	16	78	['0art0', 'JovanGerb', 'eric-wieser', 'github-actions', 'grunweg', 'joneugster', 'leanprover-bot', 'rosborn']	nobody	1-36770 1 day ago	12-34673 12 days ago	186-59439 186 days
24113	ADedecker author:ADedecker	chore: reorganize and rename the Embedding --> Homeomorph constructions	This is the updated version of #12994 - rename [Homeomorph.ofIsEmbedding](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Homeomorph/Lemmas.html#Homeomorph.ofIsEmbedding) to `IsEmbedding.toHomeomorph` - move [Topology.IsEmbedding.toHomeomorph_of_surjective](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/IsLocalHomeomorph.html#Topology.IsEmbedding.toHomeomorph_of_surjective) earlier (and PascalCase it) - rename [Homeomorph.homeomorphOfContinuousOpen](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Homeomorph/Defs.html#Homeomorph.homeomorphOfContinuousOpen) to `Equiv.toHomeomorphOfContinuousOpen`, and similarly for the closed version. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	96/70	Mathlib/AlgebraicGeometry/Fiber.lean,Mathlib/AlgebraicGeometry/Morphisms/FiniteType.lean,Mathlib/AlgebraicGeometry/Morphisms/IsIso.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiSeparated.lean,Mathlib/AlgebraicGeometry/OpenImmersion.lean,Mathlib/AlgebraicGeometry/Properties.lean,Mathlib/Geometry/RingedSpace/OpenImmersion.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling/Induction.lean,Mathlib/Topology/Category/TopCat/Basic.lean,Mathlib/Topology/Category/TopCat/Limits/Products.lean,Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean,Mathlib/Topology/Constructions/SumProd.lean,Mathlib/Topology/Gluing.lean,Mathlib/Topology/Homeomorph/Defs.lean,Mathlib/Topology/Homeomorph/Lemmas.lean,Mathlib/Topology/IsLocalHomeomorph.lean,Mathlib/Topology/LocalAtTarget.lean,Mathlib/Topology/TietzeExtension.lean	19	4	['ADedecker', 'github-actions', 'grunweg']	grunweg assignee:grunweg	1-35093 1 day ago	1-35093 1 day ago	1-51483 1 day
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	27/2	Mathlib/Data/Fin/Tuple/Reflection.lean	1	1	['github-actions']	nobody	1-29115 1 day ago	1-29464 1 day ago	1-29519 1 day
23822	eric-wieser author:eric-wieser	fix: missing `noWs` in notations	Also removed the `9000` priority, since this was probably chosen randomly, and there is no comment justifying it. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	21/5	Mathlib/Algebra/Module/Torsion.lean,Mathlib/Algebra/MonoidAlgebra/Defs.lean	2	4	['eric-wieser', 'github-actions', 'urkud']	nobody	1-28766 1 day ago	10-75377 10 days ago	10-75515 10 days
5863	eric-wieser author:eric-wieser	feat: add elaborators for concrete matrices	--- - [x] depends on: #5866 - [ ] depends on: #5897 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	6	['eric-wieser', 'github-actions', 'kim-em']	nobody	1-27053 1 day ago	1-27171 1 day ago	0-0 0 seconds
24157	urkud author:urkud	feat(Convex/LinearIsometry): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	68/0	Mathlib.lean,Mathlib/Analysis/Convex/LinearIsometry.lean,Mathlib/Analysis/Convex/StrictConvexSpace.lean	3	1	['github-actions']	nobody	1-10919 1 day ago	1-10919 1 day ago	0-0 0 seconds
24158	urkud author:urkud	feat(Asymptotics/Completion): new file	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	50/0	Mathlib.lean,Mathlib/Analysis/Asymptotics/Completion.lean	2	1	['github-actions']	nobody	1-10889 1 day ago	1-10889 1 day ago	1-10959 1 day
24159	urkud author:urkud	chore(Topology/Algebra/Module/Alternating): rename some equivs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	26/11	Mathlib/Topology/Algebra/Module/Alternating/Basic.lean	1	1	['github-actions']	nobody	1-10815 1 day ago	1-10815 1 day ago	0-0 0 seconds
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	110/4	Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/Schwarzian/Basic.lean	3	1	['github-actions']	nobody	1-10725 1 day ago	1-10725 1 day ago	0-0 0 seconds
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/)		365/252	Mathlib/Analysis/Calculus/TangentCone.lean,Mathlib/Topology/Algebra/ConstMulAction.lean	2	1	['github-actions']	nobody	1-10626 1 day ago	1-10691 1 day ago	0-0 0 seconds
22163	kebekus author:kebekus	feat: canonical tensors in inner product spaces	Given an `InnerProductSpace ℝ E`, this file defines two canonical tensors. * `InnerProductSpace.canonicalContravariantTensor E : E ⊗[ℝ] E →ₗ[ℝ] ℝ`. This is the element corresponding to the inner product. * If `E` is finite-dimensional, then `E ⊗[ℝ] E` is canonically isomorphic to its dual. Accordingly, there exists an element `InnerProductSpace.canonicalCovariantTensor E : E ⊗[ℝ] E` corresponding to `InnerProductSpace.canonicalContravariantTensor E` under this identification. 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 canonical tensors are useful for defining the Laplace operator on inner product spaces in a coordinate-free way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis delegated	63/0	Mathlib.lean,Mathlib/Analysis/InnerProductSpace/CanonicalTensor.lean	2	10	['adomani', 'github-actions', 'kebekus', 'loefflerd', 'mathlib-bors', 'sgouezel']	nobody	1-5039 1 day ago	1-60170 1 day ago	55-5556 55 days
24151	robertmaxton42 author:robertmaxton42	chore (Limits/Pullback): fix misnamed `pullback_fst_iso_of_right_iso`	`pullback_snd_iso_of_right_iso` in fact proves that `IsIso pullback.fst`; change the lemma name to match the content. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory easy awaiting-author	1/1	Mathlib/CategoryTheory/Limits/Shapes/Pullback/Iso.lean	1	3	['github-actions', 'grunweg']	nobody	1-2706 1 day ago	1-2706 1 day ago	0-36289 10 hours
24145	grunweg author:grunweg	chore: rename LinearEquiv.prod to prodCongr	[Zulip discussion]([#mathlib4 > Naming convention @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Naming.20convention/near/512683092)) As a bonus, replace some outdated `prod.map` in module doc-strings by `Prod.map`. --- Best reviewed commit by commit. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		58/48	Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Analysis/Calculus/LagrangeMultipliers.lean,Mathlib/Analysis/Normed/Lp/PiLp.lean,Mathlib/LinearAlgebra/Basis/Prod.lean,Mathlib/LinearAlgebra/Basis/VectorSpace.lean,Mathlib/LinearAlgebra/Dimension/Constructions.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/LinearAlgebra/QuadraticForm/Dual.lean,Mathlib/LinearAlgebra/QuadraticForm/Prod.lean,Mathlib/LinearAlgebra/TensorProduct/Prod.lean,Mathlib/LinearAlgebra/Trace.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/RingTheory/TensorProduct/IsBaseChangePi.lean,Mathlib/Topology/Algebra/Module/Equiv.lean	15	3	['github-actions', 'grunweg']	nobody	1-1870 1 day ago	1-1870 1 day ago	1-4769 1 day
23942	Moises-Herradon-Cueto author:Moises-Herradon-Cueto	feat(WithTerminal): show equivalence of cones with `Over` category	Show how limits in an over category relate to limits in the original category. This is useful to show that if a functor `F` preserves limits, then `Over.post F` between corresponding over categories preserves limits as well. From Toric --- I could replace `Over` by `Under`, `Limit` by `Colimit`, etc to make dual versions. Should I? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric new-contributor t-category-theory awaiting-author	123/0	Mathlib.lean,Mathlib/CategoryTheory/WithTerminal/Cone.lean	2	32	['Moises-Herradon-Cueto', 'YaelDillies', 'b-mehta', 'github-actions']	nobody	0-86304 23 hours ago	2-47598 2 days ago	5-11182 5 days
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	220/9	Mathlib.lean,Mathlib/MeasureTheory/Function/LpSeminorm/Defs.lean,Mathlib/MeasureTheory/Function/LpSeminorm/NNLpNorm.lean,Mathlib/MeasureTheory/Function/LpSeminorm/TriangleInequality.lean	4	13	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'sgouezel']	nobody	0-85785 23 hours ago	0-85834 23 hours ago	8-58535 8 days
16408	Parcly-Taxel author:Parcly-Taxel	chore: deprecate `Order.Nat`	* Move the two `Nat` instances and `bot_eq_zero` to `Order.BoundedOrder.Basic`. We also remove the TODO relating to #13092, as it was tried and it was agreed not to be a good idea. * Move the other two lemmas in `Order.Nat` to `Data.Nat.Find`.	tech debt	35/54	Mathlib/Algebra/IsPrimePow.lean,Mathlib/Data/Finset/Grade.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Cast/SetInterval.lean,Mathlib/Data/Nat/Find.lean,Mathlib/Data/Nat/SuccPred.lean,Mathlib/Data/Rat/Cast/Defs.lean,Mathlib/Order/BoundedOrder/Basic.lean,Mathlib/Order/Filter/AtTopBot/Basic.lean,Mathlib/Order/Nat.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/SetTheory/Cardinal/Order.lean	13	8	['Parcly-Taxel', 'YaelDillies', 'github-actions', 'grunweg']	nobody	0-83459 23 hours ago	3-23140 3 days ago	5-58250 5 days
24164	ADedecker author:ADedecker	chore: use `trichotomy_of_add_eq_add` to prove `MvPowerSeries.lexOrder_mul`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	15/29	Mathlib/RingTheory/MvPowerSeries/LexOrder.lean,Mathlib/RingTheory/MvPowerSeries/NoZeroDivisors.lean	2	1	['github-actions']	nobody	0-81775 22 hours ago	0-81845 22 hours ago	0-81832 22 hours
22680	kebekus author:kebekus	feat: behavior of AnalyticAt.order under addition	Deliver on one of the open TODOs and establish the behavior of `AnalyticAt.order` under addition. Add missing `fun_prop` lemma on the stability of analytic functions under `HPow.hPow`. Generalize the statement on the behavior of `AnalyticAt.order` under multiplication to scalar multiplication. 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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	178/24	Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Analytic/Order.lean	2	10	['girving', 'github-actions', 'kebekus', 'loefflerd']	nobody	0-79839 22 hours ago	38-7945 1 month ago	42-49689 42 days
22085	IvanRenison author:IvanRenison	feat(Combinatorics/SimpleGraph): introduce `ConnectedComponent.toSimpleGraph`	--- I don't know if `ConnectedComponent.Graph` is the best name for this [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics	73/32	Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean	2	6	['IvanRenison', 'github-actions', 'leanprover-community-bot-assistant', 'pimotte']	nobody	0-78110 21 hours ago	0-78304 21 hours ago	48-71623 48 days
23945	jano-wol author:jano-wol	feat(LinearAlgebra/RootSystem): Characterize root system invariant submodules in terms of roots	Characterize root system invariant submodules in terms of roots --- This PR shows that invariant submodules either contain roots, or are perpendicular to them. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	113/14	Mathlib/LinearAlgebra/Dual/Lemmas.lean,Mathlib/LinearAlgebra/RootSystem/Defs.lean,Mathlib/LinearAlgebra/RootSystem/Finite/CanonicalBilinear.lean,Mathlib/LinearAlgebra/RootSystem/Irreducible.lean	4	10	['github-actions', 'jano-wol', 'ocfnash']	ocfnash assignee:ocfnash	0-76978 21 hours ago	0-80404 22 hours ago	5-21198 5 days
24168	grunweg author:grunweg	feat: add {Add,Linear}Equiv.{prodUnique,uniqueProd}	Rebased version of #9105. TODO: transplant the changes to Mathlib/LinearAlgebra/Prod.lean and Mathlib/Algebra/Algebra/Prod.lean. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	WIP	14/4	Mathlib/Algebra/Group/Prod.lean,Mathlib/Logic/Equiv/Defs.lean	2	1	['github-actions']	nobody	0-73708 20 hours ago	0-73768 20 hours ago	0-1 1 second
23912	YaelDillies author:YaelDillies	feat: an equivalence of categories lifts to an equivalence of their group objects	The corresponding results for (comm) monoid objects can't be proven currently due to a diamond. From Toric --- - [ ] depends on: #24049 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric t-category-theory blocked-by-other-PR	321/142	Mathlib.lean,Mathlib/Algebra/Category/Grp/ChosenFiniteProducts.lean,Mathlib/Algebra/Category/Grp/LeftExactFunctor.lean,Mathlib/CategoryTheory/ChosenFiniteProducts.lean,Mathlib/CategoryTheory/Closed/Cartesian.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/CommGrp_.lean,Mathlib/CategoryTheory/Monoidal/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Mon_.lean	11	7	['YaelDillies', 'github-actions', 'joelriou', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-69664 19 hours ago	4-42941 4 days ago	0-9656 2 hours
24167	AntoineChambert-Loir author:AntoineChambert-Loir	Feat(Data/Fin/Tuple/Embedding): create embeddings of Fin Nat to types	Define * `Fin.Embedding.cons`, `Fin.Embedding.tail` * `Fin.Embedding.snoc`, `Fin.Embedding.init` * `Fin.Embedding.append` analogously to `Fin.cons`, `Fin.snoc`, `Fin.append`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	160/0	Mathlib.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean	3	1	['github-actions']	nobody	0-68370 18 hours ago	0-77758 21 hours ago	0-77816 21 hours
22890	BGuillemet author:BGuillemet	feat: add versions of the Lebesgue number lemma	Add versions of the Lebesgue number lemma, for coverings by neighborhoods rather than by open subsets (in `Topology/UniformSpace/Compact.lean`). Add specializations of the Lebesgue number lemma for extended metric spaces (in `Topology/EMetricSpace/Basic.lean`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-topology	87/0	Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/UniformSpace/Compact.lean	2	1	['github-actions']	nobody	0-66193 18 hours ago	37-23984 1 month ago	37-23970 37 days
23542	kbuzzard author:kbuzzard	chore(RingTheory/DedekindDomain/FiniteAdeleRing): refactor finite adeles	Now we have a general theory of restricted products, we can refactor mathlib's finite adele file, removing the auxiliary results which are unused outside this file and replacing everything with much slicker proofs. Crucially, we also have a far more conceptual definition of the topology on the finite adele ring -- this is the big win. The motivation for this refactor is that the FLT project needs many more results about finite adeles (for example local compactness in the number field case) and this will be very easy to prove with this new definition (using `RestrictedProduct.locallyCompactSpace_of_addGroup`), whereas it took an entire project https://github.com/smmercuri/adele-ring_locally-compact with our current approach. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) The diff should not be taken too seriously: the file is rewritten from scratch and is a quarter the size. I have no idea what to do about deprecations here. I have removed several results (and two definitions) because we don't want them, they were just auxiliary results needed in the old proof of `IsTopologicalRing` and were not used anywhere else; after Anatole's complete rethink of the topology he gets this result for free so my proposal pretty clearly is just to nuke the old results and constructions, while keeping the key constructions (namely the structure of topological ring). The key deletions are `FiniteIntegralAdeles` (which we can still have as `∀ v : HeightOneSpectrum R, v.adicCompletionIntegers K`) and `ProdAdicCompletions` (an auxiliary construction, which we can still have as `∀ v : HeightOneSpectrum R, v.adicCompletion K`). These auxiliary definitions were also used a little in the FLT project; https://github.com/ImperialCollegeLondon/FLT/pull/399 is the accompanying PR which is waiting on this.	maintainer-merge t-algebra t-number-theory label:t-algebra$	79/409	Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/RestrictedProduct.lean	2	21	['ADedecker', 'Ruben-VandeVelde', 'github-actions', 'kbuzzard', 'loefflerd', 'mariainesdff', 'smmercuri']	nobody	0-62564 17 hours ago	0-62565 17 hours ago	17-68067 17 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/)	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	16	['b-mehta', 'github-actions', 'leanprover-bot', 'mathlib-bors', 'mattrobball']	nobody	0-58432 16 hours ago	15-57236 15 days ago	0-5717 1 hour
23386	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/MultiplePretransitivity): define multiply transitive actions	This PR defines multiply transitive actions and proves the first basic lemmas about them. * `MulAction.IsMultiplyPretransitive`: An multiplicative action of a group `G` on a type `α` is n-transitive if the action of `G` on `Fin n ↪ α` is pretransitive. * Any action is 0-pretransitive * `MulAction.is_one_pretransitive_iff` : An action is 1-pretransitive iff it is pretransitive * `MulAction.is_two_pretransitive_iff` : An action is 2-pretransitive if for any `a`, `b`, `c`, `d`, such that `a ≠ b` and `c ≠ d`, there exist `g : G` such that `g • a = b` and `g • c = d`. * `MulAction.isMultiplyPretransitive_of_le` : If an action is `n`-pretransitive, then it is `m`-pretransitive for all `m ≤ n`. ## Remarks on implementation These results are results about actions on types `n ↪ α` induced by an action on `α`, and some results are developed in this context. --- depends on: #24167 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	524/0	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean	6	4	['AntoineChambert-Loir', 'D-Thomine', 'github-actions']	nobody	0-58166 16 hours ago	22-25190 22 days ago	22-25191 22 days
24170	ADedecker author:ADedecker	chore: start semilinearizing LinearAlgebra.Finsupp	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	63/44	Mathlib/Data/Finsupp/SMulWithZero.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/LSum.lean	3	2	['ADedecker', 'github-actions']	nobody	0-55354 15 hours ago	0-64709 17 hours ago	0-64696 17 hours
24173	YaelDillies author:YaelDillies	feat: the composition of open relations is open	[Zulip](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/.60IsOpen.60.20and.20.60compRel.60) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology	50/1	Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean	3	2	['ADedecker', 'github-actions']	nobody	0-54403 15 hours ago	0-56297 15 hours ago	0-56350 15 hours
23124	YaelDillies author:YaelDillies	feat(MetricSpace): nets	Define nets, which are a quantitative notion of compactness in a metric space. From my PhD (MiscYD) --- - [x] depends on: #23180 - [ ] depends on: #23181 - [ ] depends on: #23920 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	554/315	Mathlib.lean,Mathlib/Dynamics/TopologicalEntropy/CoverEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/DynamicalEntourage.lean,Mathlib/Dynamics/TopologicalEntropy/NetEntropy.lean,Mathlib/Dynamics/TopologicalEntropy/Semiconj.lean,Mathlib/Topology/MetricSpace/Cover.lean,Mathlib/Topology/MetricSpace/MetricSeparated.lean,Mathlib/Topology/Metrizable/Uniformity.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Cauchy.lean,Mathlib/Topology/UniformSpace/Cover.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Entourage.lean,Mathlib/Topology/UniformSpace/Separated.lean,Mathlib/Topology/UniformSpace/UniformConvergence.lean	15	8	['D-Thomine', 'YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	0-54333 15 hours ago	0-54349 15 hours ago	1-52822 1 day
24095	lecopivo author:lecopivo	feat: `fun_prop` for Is(Bounded)LinearMap + notation `fun x ↦L[R] f x`	Sets up `fun_prop` for `IsLinearMap` and `IsBoundedLinearMap` also adds notation `fun x ↦ₗ[R] f x` and `fun x ↦L[R] f x` to write bundled versions like lambda function instead of the currently used pointfree notation.	large-import t-algebra awaiting-author label:t-algebra$	292/22	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/LinearMap/Pi.lean,Mathlib/Algebra/Module/LinearMap/Prod.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean	4	19	['eric-wieser', 'github-actions', 'lecopivo']	nobody	0-51898 14 hours ago	3-28843 3 days ago	0-18402 5 hours
24147	kbuzzard author:kbuzzard	feat: criterion for cofinite filter tends to cofinite.	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order delegated	5/0	Mathlib/Order/Filter/Cofinite.lean	1	6	['b-mehta', 'github-actions', 'kbuzzard', 'mathlib-bors']	nobody	0-49922 13 hours ago	0-65052 18 hours ago	0-70668 19 hours
21603	imbrem author:imbrem	feat(CategoryTheory/ChosenFiniteProducts): Added basic ChosenFiniteCoproducts class	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. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-category-theory	261/2	Mathlib/CategoryTheory/ChosenFiniteProducts.lean	1	13	['TwoFX', 'github-actions', 'imbrem', 'joelriou']	nobody	0-49225 13 hours ago	11-69942 11 days ago	67-23322 67 days
24172	LessnessRandomness author:LessnessRandomness	feat: specialize rational root theorem to usual rational numbers and integers	Rational root theorem and integral root theorem - the special case for usual rational numbers and integers. ---	new-contributor t-algebra label:t-algebra$	123/0	Mathlib.lean,Mathlib/RingTheory/Polynomial/OfRationalNumbers/RationalRootTheorem.lean	2	1	['github-actions']	nobody	0-47748 13 hours ago	0-57709 16 hours ago	0-57767 16 hours
24160	urkud author:urkud	feat: `(-1) ^ m = (-1) ^ n`	- add `neg_one_pow_congr`; - prove a lemma about parity of `Fin.succAbove i j + Fin.predAbove j i`. Backported (with adjusted API) from https://github.com/urkud/DeRhamCohomology --- - [x] depends on: #24153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		24/4	Mathlib/Algebra/Ring/Parity.lean,Mathlib/Data/Fin/Parity.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	0-45710 12 hours ago	0-45710 12 hours ago	0-76589 21 hours
24162	urkud author:urkud	feat(Calculus/BumpFunction/SmoothApprox): new file	Reformulate theorems about density of smooth functions without measures. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	66/0	Mathlib.lean,Mathlib/Analysis/Calculus/BumpFunction/SmoothApprox.lean	2	1	['github-actions']	nobody	0-45479 12 hours ago	0-47456 13 hours ago	1-10709 1 day
24104	dwrensha author:dwrensha	feat: add the strict triangle inequality for non-Wbtw points, and related lemmas	See [this zulip thread](https://leanprover.zulipchat.com/#narrow/channel/217875-Is-there-code-for-X.3F/topic/strict.20triangle.20inequality.20in.20Euclidean.20space/near/512427539). Co-authored-by: Eric Wieser --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	17/0	Mathlib/Analysis/Convex/Between.lean,Mathlib/Analysis/Convex/StrictConvexBetween.lean	2	22	['dwrensha', 'eric-wieser', 'fpvandoorn', 'github-actions']	nobody	0-44827 12 hours ago	3-23787 3 days ago	3-23842 3 days
24182	mistarro author:mistarro	refactor(FieldTheory/IntermediateField): remove instance `IntermediateField.instCoeOutSubtypeMem`	Zulip discussion: [Working with intermediate fields of intermediate fields](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/.E2.9C.94.20Working.20with.20intermediate.20fields.20of.20intermediate.20fields) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	13/21	Mathlib/FieldTheory/Galois/Infinite.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean	3	1	['github-actions']	nobody	0-43942 12 hours ago	0-43942 12 hours ago	0-44005 12 hours
23558	JovanGerb author:JovanGerb	feat: don't delaborate to `⊔` or `⊓` if we have a `LinearOrder`	This PR changes the `⊔` and `⊓` notations to only be used by the delaborator if the type in question is not a linear order. This was suggested here [#mathlib4 > max and min delaborators @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/max.20and.20min.20delaborators/near/500701449) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import maintainer-merge t-order t-meta	154/8	Mathlib/Order/Notation.lean,MathlibTest/Delab/SupInf.lean	2	41	['JovanGerb', 'eric-wieser', 'fpvandoorn', 'github-actions', 'kmill']	kmill assignee:kmill	0-42255 11 hours ago	0-42255 11 hours ago	17-32893 17 days
23876	Thmoas-Guan author:Thmoas-Guan	chore(RingTheory/Ideal): move associated prime	Move associated prime into a folder for further developments. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	2/2	Mathlib.lean,Mathlib/RingTheory/Ideal/AssociatedPrime/Basic.lean,Mathlib/RingTheory/Regular/IsSMulRegular.lean	3	5	['Ruben-VandeVelde', 'Thmoas-Guan', 'adomani', 'github-actions']	nobody	0-41475 11 hours ago	9-57596 9 days ago	9-57667 9 days
21103	joelriou author:joelriou	feat(AlgebraicTopology/SimplicialSet): uniqueness of the decomposition involving non-degenerate simplices	Any simplex `x : X _⦋n⦌` of a simplicial set can be written in a unique way as `X.map f.op y` for an epimorphism `f : ⦋n⦌ ⟶ ⦋m⦌` and a non-degenerate `m`-simplex `y`. --- - [x] depends on: #21098 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	118/5	Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplicialSet/Degenerate.lean	2	4	['gio256', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-40402 11 hours ago	0-40640 11 hours ago	38-72247 38 days
22651	101damnations author:101damnations	feat(RepresentationTheory/*): subrepresentations, quotients by subrepresentations, and representations of quotient groups	Given a `G`-representation `(V, ρ)` and a `G`-invariant submodule `W ≤ V`, this PR defines the restriction of `ρ` to `W` as a representation, and the representation on `V / W` induced by `ρ`. When `S` is a normal subgroup of `G` on which `ρ` is trivial, we also define the `G / S` representation induced by `ρ`. We use this to define the `G / S` representation on `V^S`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	170/11	Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	3	1	['github-actions']	nobody	0-39124 10 hours ago	43-49196 1 month ago	43-49249 43 days
23487	YaelDillies author:YaelDillies	refactor: spell results using `Minimal`/`MinimalWrt`	From Toric --- - [x] depends on: #23586 - [x] depends on: #23592 - [x] depends on: #23624 - [x] depends on: #23706 - [x] depends on: #23737 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-data	119/108	Mathlib/Combinatorics/Additive/Dissociation.lean,Mathlib/Combinatorics/Additive/RuzsaCovering.lean,Mathlib/Combinatorics/Colex.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/Order.lean,Mathlib/Data/Matroid/IndepAxioms.lean,Mathlib/Data/Set/Finite/Basic.lean,Mathlib/Order/Atoms/Finite.lean,Mathlib/Order/Birkhoff.lean,Mathlib/Order/Interval/Finset/Basic.lean,Mathlib/Order/Interval/Finset/Nat.lean,Mathlib/Order/Lattice.lean,Mathlib/Order/Minimal.lean,Mathlib/RingTheory/Polynomial/Basic.lean,Mathlib/Topology/ShrinkingLemma.lean	15	10	['YaelDillies', 'b-mehta', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-38805 10 hours ago	0-38825 10 hours ago	0-47343 13 hours
22929	b-mehta author:b-mehta	feat(Order/Cover): characterise covering in Pi types	Characterise the covering relation in products of partial orders. Generalise this characterisation to products of preorders. Use the characterisation to significantly simplify the characterisation of atoms in products of partial orders. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	137/41	Mathlib/Order/Atoms.lean,Mathlib/Order/Cover.lean	2	2	['b-mehta', 'github-actions']	nobody	0-38737 10 hours ago	35-65271 1 month ago	35-65326 35 days
23972	Paul-Lez author:Paul-Lez	feat(CategoryTheory/Monoidal/Mod_): add a class version of modules over monoid objects	From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric maintainer-merge t-category-theory	73/3	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mod_.lean,Mathlib/CategoryTheory/Monoidal/Mod_.lean	3	25	['Paul-Lez', 'YaelDillies', 'erdOne', 'github-actions']	nobody	0-37936 10 hours ago	1-32410 1 day ago	3-50796 3 days
22748	joelriou author:joelriou	feat(CategoryTheory/Localization): the calculus of fractions that is deduced from an adjunction	If `G ⊣ F` is an adjunction, and `F` is fully faithful, then there is a left calculus of fractions for the inverse image by `G` of the class of isomorphisms. (The dual statement is also obtained.) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	67/0	Mathlib.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions/OfAdjunction.lean,Mathlib/CategoryTheory/MorphismProperty/Basic.lean	3	1	['github-actions']	nobody	0-37711 10 hours ago	40-45916 1 month ago	40-45902 40 days
22620	ahhwuhu author:ahhwuhu	feat: Define shifted Legendre polynomials and prove some basic properties	Define shifted Legendre polynomials and prove that it is integer polynomial. In the same time, its evaluation on x is equal to the evaluation on 1 - x.	new-contributor t-analysis awaiting-author	123/0	Mathlib.lean,Mathlib/Analysis/ShiftedLegendrePoly.lean	2	12	['acmepjz', 'ahhwuhu', 'b-mehta', 'github-actions', 'riccardobrasca']	nobody	0-37373 10 hours ago	0-37373 10 hours ago	43-62882 43 days
22915	pimotte author:pimotte	feat(Combinatorics/SimpleGraph): Tutte's theorem	Proves Tutte's theorem. --- - [x] depends on: #22242 - [ ] depends on: #22119 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics blocked-by-other-PR	429/9	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Represents.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean,Mathlib/Data/Set/Card.lean,docs/1000.yaml	9	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-37321 10 hours ago	0-67187 18 hours ago	0-673 11 minutes
22119	pimotte author:pimotte	feat(Combinatorics/SimpleGraph): part of Tutte's theorem	Adds three key parts of the proof of Tutte's theorem, with some supporting lemma's: - necessity of the Tutte condition (`not_isTutteViolator`) - the fact that the empty set violates the Tutte condition if the number of vertices is odd (`IsTutteViolator.empty`) - the construction of a perfect matching in a graph that decomposes into cliques (`Subgraph.IsPerfectMatching.exists_of_isClique_supp`) Definitions added: `IsTutteViolator`. --- - [x] depends on: #22125 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) [Zulip thread on Tutte's](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Tutte's.20theorem)	maintainer-merge t-combinatorics	195/11	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Represents.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Combinatorics/SimpleGraph/Tutte.lean,Mathlib/Combinatorics/SimpleGraph/UniversalVerts.lean,Mathlib/Data/Set/Card.lean	6	47	['YaelDillies', 'b-mehta', 'github-actions', 'mathlib4-dependent-issues-bot', 'pimotte']	nobody	0-37274 10 hours ago	0-72439 20 hours ago	23-27802 23 days
22919	plp127 author:plp127	feat(Data/Fintype/Pi): Make `Fintype` instance for `RelHom`s computable	Makes the `Fintype` instance for rel homs computable. See this [Zulip](https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/Classical.20vs.20constructive.20logic.20in.20computation/near/496220816) message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	118/32	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/Maps.lean,Mathlib/Data/Fintype/Pi.lean,Mathlib/Order/RelIso/Basic.lean	5	17	['IvanRenison', 'b-mehta', 'github-actions', 'plp127']	b-mehta assignee:b-mehta	0-36882 10 hours ago	0-36882 10 hours ago	35-71340 35 days
23414	robin-carlier author:robin-carlier	feat(CategoryTheory/Join): finality/initiality of the inclusions	We prove that whenever `C` is connected, the inclusion `C ⥤ C ⋆ D` is `Initial`. Dually, when `D` is connected, the inclusion `inclRight C D` is `Final`. --- - [ ] depends on: #23412 - [x] depends on: #23410 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	52/0	Mathlib.lean,Mathlib/CategoryTheory/Join/Final.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-36408 10 hours ago	0-36424 10 hours ago	0-38398 10 hours
24171	grunweg author:grunweg	chore: fix more mis-indented list items in doc-strings	Continuation of #24166: this PR fixes several actually mis-formatted doc-string. --- Best reviewed commit by commit; most diffs should be empty/very short when hiding whitespace changes. I tried to make commit messages explain roughly what happens. Most commits are "indent a list item, where this doesn't change formatting" (called "harmless" sometimes); most others are "add a newline to clarify a new paragraph starts (just for easier reading). The remaining commits either edit a doc-string very slightly, or fix actual misformatted doc-strings. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		589/559	Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/Sheaf/Limits.lean,Mathlib/Algebra/CharZero/Defs.lean,Mathlib/Algebra/Exact.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Inductions.lean,Mathlib/Algebra/Polynomial/Laurent.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Smeval.lean,Mathlib/Analysis/BoxIntegral/UnitPartition.lean,Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/Calculus/Rademacher.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Complex/Conformal.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/InnerProductSpace/Symmetric.lean,Mathlib/Analysis/LocallyConvex/Bounded.lean,Mathlib/Analysis/LocallyConvex/WeakDual.lean,Mathlib/Analysis/LocallyConvex/WithSeminorms.lean,Mathlib/Analysis/Normed/Group/CocompactMap.lean,Mathlib/Analysis/Normed/Group/Completeness.lean,Mathlib/Analysis/Normed/Group/SeparationQuotient.lean,Mathlib/Analysis/Normed/Module/Span.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/InjectiveSeminorm.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/CategoryTheory/ConcreteCategory/Basic.lean,Mathlib/CategoryTheory/Distributive/Monoidal.lean,Mathlib/CategoryTheory/Equivalence.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Generator/Basic.lean,Mathlib/CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean,Mathlib/CategoryTheory/Limits/Preserves/FunctorCategory.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/HasPullback.lean,Mathlib/CategoryTheory/Limits/Shapes/Pullback/PullbackCone.lean,Mathlib/CategoryTheory/Localization/DerivabilityStructure/Constructor.lean,Mathlib/CategoryTheory/Localization/Resolution.lean,Mathlib/CategoryTheory/Monoidal/Category.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/CategoryTheory/Monoidal/Limits.lean,Mathlib/CategoryTheory/MorphismProperty/Representable.lean,Mathlib/CategoryTheory/NatIso.lean,Mathlib/CategoryTheory/ObjectProperty/Basic.lean,Mathlib/CategoryTheory/Sites/ConstantSheaf.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/CoverPreserving.lean,Mathlib/CategoryTheory/Sites/Monoidal.lean,Mathlib/CategoryTheory/Sites/NonabelianCohomology/H1.lean,Mathlib/CategoryTheory/Sites/Pullback.lean,Mathlib/CategoryTheory/SmallObject/Basic.lean,Mathlib/CategoryTheory/SmallObject/TransfiniteCompositionLifting.lean,Mathlib/CategoryTheory/Triangulated/Subcategory.lean,Mathlib/Combinatorics/Configuration.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Data/Bracket.lean,Mathlib/Data/DFinsupp/NeLocus.lean,Mathlib/Data/List/Range.lean,Mathlib/Data/Nat/Choose/Basic.lean,Mathlib/Data/Nat/Choose/Factorization.lean,Mathlib/Data/Nat/Choose/Lucas.lean,Mathlib/Data/Nat/Factorization/Defs.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Part.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Setoid/Partition/Card.lean,Mathlib/Data/Sigma/Order.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/AbelRuffini.lean,Mathlib/FieldTheory/AxGrothendieck.lean,Mathlib/FieldTheory/Minpoly/IsConjRoot.lean,Mathlib/FieldTheory/Separable.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/Basic.lean,Mathlib/Geometry/Manifold/IntegralCurve/ExistUnique.lean,Mathlib/Geometry/Manifold/IntegralCurve/UniformTime.lean,Mathlib/Geometry/Manifold/IsManifold/ExtChartAt.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Geometry/Manifold/MFDeriv/UniqueDifferential.lean,Mathlib/Geometry/Manifold/VectorBundle/Tangent.lean,Mathlib/GroupTheory/Coset/Card.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/Frattini.lean,Mathlib/GroupTheory/FreeAbelianGroup.lean,Mathlib/GroupTheory/PushoutI.lean,Mathlib/GroupTheory/SpecificGroups/Alternating/Centralizer.lean,Mathlib/Lean/Meta/CongrTheorems.lean,Mathlib/LinearAlgebra/ExteriorPower/Basic.lean,Mathlib/LinearAlgebra/Lagrange.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/LinearAlgebra/Orientation.lean,Mathlib/LinearAlgebra/Ray.lean,Mathlib/Logic/Equiv/PartialEquiv.lean,Mathlib/MeasureTheory/Category/MeasCat.lean,Mathlib/MeasureTheory/Covering/VitaliFamily.lean,Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/MeasureTheory/Group/FundamentalDomain.lean	177	3	['b-mehta', 'github-actions']	nobody	0-35736 9 hours ago	0-45236 12 hours ago	0-45231 12 hours
19865	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define extremalNumber	Define the extremal number `extremalNumber n H` of a natural number `n` and a simple graph `H`: `extremalNumber n H` is the maximum number of edges in a `H`-free simple graph on `n` vertices, if `H` is contained in all simple graphs on `n` vertices, then this is `0`. Also define the predicate that a simple graph is an extremal graph `IsExtremal` satisfying some predicate. --- - [x] depends on: #20658 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics ready-to-merge	203/5	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Copy.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean	3	53	['YaelDillies', 'b-mehta', 'github-actions', 'kim-em', 'mathlib-bors', 'mathlib4-dependent-issues-bot', 'mitchell-horner']	nobody	0-35615 9 hours ago	0-50549 14 hours ago	54-39564 54 days
19668	YaelDillies author:YaelDillies	refactor: define `≤`/`<` on `WithBot`/`WithTop` by induction	The motivation for this change is that it is really confusing to run `intro r s shouldnthaveintroedthat` on a goal of the form `∀ r s : ℝ≥0∞, r ≤ s` and get the nonsense-looking goal `r = ↑shouldnthaveintroedthat → ∃ b : α, s = ↑b ∧ shouldnthaveintroedthat ≤ b⟩` instead of an error, and similarly when destructing something of the form `∃ r s : ℝ≥0∞, r < s`. Furthermore, I suspect this improves performance. --- - [x] depends on: #20317 - [x] depends on: #20318 - [x] depends on: #21274 - [x] depends on: #22109 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order	65/47	Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Oscillation.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Max.lean,Mathlib/LinearAlgebra/Eigenspace/Triangularizable.lean,Mathlib/MeasureTheory/Integral/Lebesgue/Countable.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/Order/Interval/Basic.lean,Mathlib/Order/Interval/Set/WithBotTop.lean,Mathlib/Order/WithBot.lean,Mathlib/Probability/Variance.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/Topology/MetricSpace/Holder.lean,Mathlib/Topology/MetricSpace/HolderNorm.lean	14	17	['YaelDillies', 'b-mehta', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	0-35017 9 hours ago	10-8618 10 days ago	22-42895 22 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	6/4	Mathlib/Data/Finsupp/Pointwise.lean	1	6	['Paul-Lez', 'eric-wieser', 'github-actions']	nobody	0-34860 9 hours ago	4-42397 4 days ago	4-42453 4 days
20681	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define deleteIncidenceSet	Define the operation `G.deleteIncidenceSet x` deleting the incidence set of the vertex `x` from the edge set of the simple graph `G` and prove theorems in the finite case. --- - [x] depends on: #20825 - [x] depends on: #23808 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics	108/3	Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean	3	8	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mitchell-horner']	nobody	0-34158 9 hours ago	0-34165 9 hours ago	50-60594 50 days
24150	urkud author:urkud	refactor(Deriv/ZPow): change RHS of `iter_deriv_inv`	--- - [ ] depends on: #24146 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		13/4	Mathlib/Algebra/BigOperators/Ring/Finset.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean	2	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-33886 9 hours ago	1-32978 1 day ago	1-33388 1 day
23413	robin-carlier author:robin-carlier	feat(CategoryTheory/Join): Pseudofunctoriality of joins of categories	Promote the constructions `C ↦ C ⋆ D` and `D ↦ C ⋆ D` to pseudofunctors from `Cat` to `Cat`. The construction is carried in a new file `CategoryTheory/Join/Pseudofunctor.lean` to reduce imports. --- - [x] depends on: #23412 The pseudofunctoriality statements here are not the most general. The "right" statements would be 1) "pseudobifunctoriality". 2) pseudofunctoriality with values in slice bicategories. Unfortunately, the two-categorical machinery in mathlib is not advanced enough yet to even make sense of the statements (first would require at least product bicategories, or 2-categories of pseudofunctors for a curried version, second would require slice bicategories.). The content of this file should be upgraded once said constructions in bicategories are available, but for now I want at least to have statements that recover what we already have for `WithInitial` and `WithTerminal` rather than conditioning everything on a (probably rather long) bicategorical sidequest. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory	251/0	Mathlib.lean,Mathlib/CategoryTheory/Join/Pseudofunctor.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-30411 8 hours ago	0-36562 10 hours ago	0-39120 10 hours
24186	j-loreaux author:j-loreaux	perf: lower priority of `ℝ≥0∞`-induced actions	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-data	15/10	Mathlib/Data/ENNReal/Action.lean	1	4	['github-actions', 'j-loreaux', 'leanprover-bot']	nobody	0-30370 8 hours ago	0-31956 8 hours ago	0-33494 9 hours
24037	YaelDillies author:YaelDillies	feat: `insert (b + 1) (Ioc a b) = Ioc a (b + 1)`	And shorten recently introduced names for consistency --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-author	164/32	Mathlib/Algebra/Order/Interval/Finset/SuccPred.lean,Mathlib/Algebra/Order/Interval/Set/SuccPred.lean,Mathlib/Order/Interval/Finset/SuccPred.lean,Mathlib/Order/Interval/Set/SuccPred.lean	4	7	['Ruben-VandeVelde', 'b-mehta', 'github-actions']	nobody	0-29641 8 hours ago	0-29641 8 hours ago	4-19619 4 days
24149	YaelDillies author:YaelDillies	refactor: define the dual of a cone as a pointed cone	We currently have two definitions of the dual of a cone: * `Set.innerDualCone : Set H → ConvexCone ℝ H`, which is a `ConvexCone` * `PointedCone.dual : PointedCone ℝ H → PointedCone ℝ H` But in fact `Set.innerDualCone` is always pointed, and it's useful to talk about the dual of an arbitrary set as a `PointedCone`. This PR unifies those constructions under a single function `PointedCone.innerDual : Set H → ConvexCone ℝ H`. The `inner` in the name corresponds to the fact that we are turning a cone in an inner product space `H` into another cone in `H`, rather than a cone in `M` into a cone in its dual `N`. We will soon need the latter generality in the Toric project. From Toric --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis	129/170	Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Analysis/Convex/Cone/Closure.lean,Mathlib/Analysis/Convex/Cone/InnerDual.lean,Mathlib/Analysis/Convex/Cone/Pointed.lean,Mathlib/Analysis/Convex/Cone/Proper.lean	5	2	['YaelDillies', 'github-actions']	nobody	0-29160 8 hours ago	0-30721 8 hours ago	0-31540 8 hours
24118	YaelDillies author:YaelDillies	feat: Yoneda for (comm) group objects	And make the API between monoid and group objects more alike. From Toric Co-authored-by: Andrew Yang Co-authored-by: Michał Mrugała --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	toric large-import t-category-theory	386/227	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommGrp.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/CommMon_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Grp_.lean,Mathlib/CategoryTheory/Monoidal/Cartesian/Mon_.lean,Mathlib/CategoryTheory/Monoidal/Yoneda.lean	6	8	['erdOne', 'github-actions']	nobody	0-26992 7 hours ago	0-27393 7 hours ago	1-25788 1 day
24139	yuanyi-350 author:yuanyi-350	feat: add `Fin.cycleIcc` which rotates `range(i, j)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra label:t-algebra$	104/1	Mathlib/Data/Fin/Basic.lean,Mathlib/GroupTheory/Perm/Fin.lean	2	7	['github-actions', 'mbkybky', 'yuanyi-350']	nobody	0-25467 7 hours ago	1-54563 1 day ago	1-72609 1 day
24130	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/MultiplyPretransitive) : Multiple transivity property of the permutation group	* The permutation group is pretransitive, is multiply pretransitive, and is preprimitive (for its natural action) * `Equiv.Perm.eq_top_if_isMultiplyPretransitive`: a subgroup of `Equiv.Perm α` which is `Nat.card α - 1` pretransitive is equal to `⊤`. --- - [ ] depends on: #24167 - [ ] depends on: #24117 - [ ] depends on: #24107 - [ ] depends on: #23962 - [ ] depends on: #23386 - [ ] depends on: #23979 [![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$	641/0	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean	6	1	['github-actions']	nobody	0-25447 7 hours ago	1-37927 1 day ago	1-83427 1 day
24120	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/Jordan) : Primitivity lemmas	This is a primitivity lemma for actions, in preparation to the proof of of Jordan on primitive subgroups of the permutation group #24131. --- - [ ] depends on: #24167 - [ ] depends on: #24117 - [ ] depends on: #24107 - [ ] depends on: #23962 - [ ] depends on: #23386 - [ ] depends on: #23979 [![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$	2530/20	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean	19	1	['github-actions']	nobody	0-25444 7 hours ago	2-52987 2 days ago	2-53045 2 days
24131	AntoineChambert-Loir author:AntoineChambert-Loir	feat: a theorem of Jordan on primitive subgroups of the permutation group	Initial commit. WIP --- - [ ] depends on: #24167 - [ ] depends on: #24117 - [ ] depends on: #24107 - [ ] depends on: #23962 - [ ] depends on: #23386 - [ ] depends on: #23979 - [ ] depends on: #24130 - [ ] depends on: #24120 [![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$	3142/20	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Embedding.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/Jordan.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-24666 6 hours ago	0-24699 6 hours ago	0-1323 22 minutes
24185	urkud author:urkud	feat(Prod/Lex): prove `Prod.Lex.covBy_iff`	Also - move the definitions of `CovBy` and `WCovBy` to `Defs/PartialOrder`; - rename instances to use `inst*`; - golf a proof using `aesop`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	maintainer-merge t-order	77/66	Mathlib/Algebra/Module/LinearMap/Defs.lean,Mathlib/Algebra/Module/Submodule/Map.lean,Mathlib/Data/Fin/FlagRange.lean,Mathlib/Data/Prod/Lex.lean,Mathlib/Order/Cover.lean,Mathlib/Order/Defs/PartialOrder.lean	6	5	['YaelDillies', 'github-actions']	nobody	0-24268 6 hours ago	0-24268 6 hours ago	0-28593 7 hours
24096	plp127 author:plp127	feat(Topology): Completely Regular Space iff Uniformizable	Proves that `CompletelyRegularSpace`s are uniformizable and that `UniformSpace`s are completely regular. --- - [ ] depends on: #24179 - [ ] depends on: #24173 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology blocked-by-other-PR	419/33	Mathlib.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/Defs.lean,Mathlib/Topology/UniformSpace/Uniformizable.lean,Mathlib/Topology/UrysohnsLemma.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-23927 6 hours ago	0-23927 6 hours ago	2-6687 2 days
23979	AntoineChambert-Loir author:AntoineChambert-Loir	feat: Multiple Primitivity of group actions	An action of a group G on a type X is n-primitive if it is n-transitive and if, for every subset s of cardinality n of X, the action of `fixingSubgroup G s` on the complement of `s` is primitive. This PR develops the basics of this notion. --- - [ ] depends on: #23970 - [ ] depends on: #23962 - [ ] depends on: #24107 - [ ] depends on: #24167 - [ ] depends on: #24117 - [ ] depends on: #23386 [![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$	1753/20	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/MultiplePrimitivity.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/Primitive.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean	18	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-22856 6 hours ago	2-53878 2 days ago	0-12 12 seconds
23970	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup): action of the fixing Subgroup on the complement of a set	Introduce the `SubMulAction` of a `fixingSubgroup` of a subset on the complement of that set. Develop relations between these and `SubMulAction` of stabilizers. --- - [ ] depends on: #23386 - [ ] depends on: #23962 - [ ] depends on: #24107 - [ ] depends on: #24117 - [ ] depends on: #24167 [![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$	1409/19	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Algebra/Group/Subgroup/Actions.lean,Mathlib/Algebra/Group/Submonoid/MulAction.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfFixingSubgroup.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean	16	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-22854 6 hours ago	6-30481 6 days ago	0-0 0 seconds
23962	AntoineChambert-Loir author:AntoineChambert-Loir	feat(GroupTheory.GroupAction.SubMulAction.OfStabilizer) : action of stabilizer on complement of a point	The SubMulAction of the stabilizer of a point on the complement of that point When a group `G` acts on a type `α`, the stabilizer of a point `a : α` acts naturally on the complement of that point. Such actions (and similar ones for other sets than singletons) are useful to study the multiple transitivity of the group `G`, since `n`-transitivity of `G` on `α` is equivalent to `n - 1`-transitivity of `stabilizer G a` on the complement of `a`. We define equivariant maps that relate various of these sub_mul_actions and permit to manipulate them in a relatively smooth way. * `SubMulAction.ofStabilizer a` : the action of `stabilizer G a` on `{a}ᶜ` * `SubMulAction.Enat_card_ofStabilizer_eq_add_one`, `SubMulAction.nat_card_ofStabilizer_eq` compute the cardinality of the `carrier` of that action. Consider `a b : α` and `g : G` such that `hg : g • b = a`. * `SubMulAction.conjMap hg` is the equivariant map from `SubMulAction.ofStabilizer G a` to `SubMulAction.ofStabilizer G b`. * `SubMulAction.ofStabilizer.isPretransitive_iff_conj hg` shows that this actions are equivalently pretransitive or * `SubMulAction.ofStabilizer.isMultiplyPretransitive_iff_conj hg` shows that this actions are equivalently `n`-pretransitive for all `n : ℕ`. * `SubMulAction.ofStabilizer.append` : given `x : Fin n ↪ ofStabilizer G a`, append `a` to obtain `y : Fin n.succ ↪ α` * `SubMulAction.ofStabilizer.isMultiplyPretransitive_iff` : is the action of `G` on `α` is pretransitive, then it is `n.succ` pretransitive if and only if the action of `stabilizer G a` on `ofStabilizer G a` is `n`-pretransitive. --- - [ ] depends on : #23386 - [ ] depends on: #24082 - [ ] depends on: #24107 - [ ] depends on: #24167 [![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$	935/17	Mathlib.lean,Mathlib/Algebra/Group/Action/Pretransitive.lean,Mathlib/Algebra/Group/End.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean,Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/MultipleTransitivity.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/GroupTheory/GroupAction/SubMulAction/OfStabilizer.lean	11	7	['AntoineChambert-Loir', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-22853 6 hours ago	2-53470 2 days ago	4-68355 4 days
21696	bryangingechen author:bryangingechen	generalize toAdditive frontend to allow use of other translations	TODO (maybe split off into future PRs?): - further extract to_additive specific stuff - rename functions - update docstrings - write a PR description --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta	229/174	Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/toAdditive.lean	3	1	['github-actions']	nobody	0-22449 6 hours ago	0-22465 6 hours ago	0-0 0 seconds
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	219/0	Mathlib.lean,Mathlib/Topology/Path/CountableConcat.lean	2	18	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'peabrainiac']	YaelDillies assignee:YaelDillies	0-21172 5 hours ago	0-21172 5 hours ago	55-84404 55 days
24190	urkud author:urkud	refactor(Calculus/MeanValue): move some theorems to `Deriv/`	--- The code is moved as is, modulo `open` and `variable` lines. I also wrote a module docstring for the new file. What should I do about deprecating imports etc? [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	536/487	Mathlib.lean,Mathlib/Analysis/Calculus/Deriv/MeanValue.lean,Mathlib/Analysis/Calculus/FirstDerivativeTest.lean,Mathlib/Analysis/Calculus/LHopital.lean,Mathlib/Analysis/Calculus/MeanValue.lean,Mathlib/Analysis/Calculus/Taylor.lean,Mathlib/Analysis/Convex/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Deriv.lean	9	1	['github-actions']	nobody	0-14636 4 hours ago	0-14901 4 hours ago	0-14901 4 hours
21719	bryangingechen author:bryangingechen	order_dual attribute	Builds on #21696: https://github.com/leanprover-community/mathlib4/compare/bgc-to-additive-0...bgc-order-dual-scratch-0 TODO: - keep tagging everything in sight with `order_dual`, currently partway through `Order.Basic` - `WithBot.le` -> `WithTop.le` is broken in `WithBot.lean`: I think I understand this now. I need to reorder the arguments of one of the fields of the instance, but it looks like the tactic doesn't support this - naming probably gets screwed up --- - [ ] depends on: #21696 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta blocked-by-other-PR	1061/358	Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/Lean/Expr/ReplaceRec.lean,Mathlib/Order/Basic.lean,Mathlib/Order/Defs/LinearOrder.lean,Mathlib/Order/Defs/PartialOrder.lean,Mathlib/Order/Notation.lean,Mathlib/Order/TypeTags.lean,Mathlib/Order/WithBot.lean,Mathlib/Tactic/ToAdditive/Frontend.lean,MathlibTest/orderDual.lean,MathlibTest/toAdditive.lean	11	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-13464 3 hours ago	0-16097 4 hours ago	0-0 0 seconds
23811	upobir author:upobir	feat(Data/Set/Card): add powerset cardinality formula	--- There is no theorem in mathlbi for formula of ncard of finite powerset, but there are related formulas for finset, multiset, cardinals. This pr adds the theorem for this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data new-contributor	8/0	Mathlib/Data/Set/Card.lean	1	3	['b-mehta', 'github-actions', 'upobir']	nobody	0-10606 2 hours ago	0-10606 2 hours ago	10-47038 10 days
23217	acmepjz author:acmepjz	chore(AlgebraicGeometry/EllipticCurve/*): refactor VariableChange	Drop certain definitions in `VariableChange` in favor of mathlib's built-in notation: - `VariableChange.id` -> `(1 : VariableChange R)` - `VariableChange.comp C C'` -> `C * C'` - `VariableChange.inv C` -> `C⁻¹` - `W.variableChange C` -> `C • W` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) Discussion: [#maths > thoughts on elliptic curves @ 💬](https://leanprover.zulipchat.com/#narrow/channel/116395-maths/topic/thoughts.20on.20elliptic.20curves/near/485467772)	t-algebraic-geometry	180/176	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/IsomOfJ.lean,Mathlib/AlgebraicGeometry/EllipticCurve/NormalForms.lean,Mathlib/AlgebraicGeometry/EllipticCurve/VariableChange.lean	4	25	['Multramate', 'acmepjz', 'github-actions']	nobody	0-7186 1 hour ago	27-9565 27 days ago	27-9551 27 days
24013	dupuisf author:dupuisf	feat(ContinuousFunctionalCalculus): `cfc` applied to products and pi types	This PR shows that `cfc f ⟨a, b⟩ = ⟨cfc f a, cfc f b⟩` and `cfc f (x : ∀ i, A i) = fun i => cfc f (x i)` and likewise for the non-unital case. Specialized version for `nnrpow`, `rpow` and `sqrt` are also given. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis awaiting-author	298/6	Mathlib.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Pi.lean,Mathlib/Analysis/SpecialFunctions/ContinuousFunctionalCalculus/Rpow/Basic.lean	4	16	['dupuisf', 'github-actions', 'j-loreaux']	nobody	0-5041 1 hour ago	0-5041 1 hour ago	3-2213 3 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 label:t-algebra$	5/0	Mathlib/GroupTheory/Index.lean	1	3	['erdOne', 'github-actions', 'j-loreaux']	nobody	0-4403 1 hour ago	0-38981 10 hours ago	0-39046 10 hours
24123	YaelDillies author:YaelDillies	chore(Algebra/BigOperators/Group/Finset/Basic): use meaningful letter names	All monoids are `M`, all groups are `G`, all indexing types are `ι` or `κ`. Also order according to typeclass assumptions --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	290/305	Archive/Imo/Imo1994Q1.lean,Counterexamples/Cyclotomic105.lean,Mathlib/Algebra/BigOperators/Group/Finset/Basic.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/LinearAlgebra/FreeModule/Int.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean	8	8	['github-actions', 'grunweg', 'j-loreaux']	nobody	0-3757 1 hour ago	0-3757 1 hour ago	1-72348 1 day
23026	Paul-Lez author:Paul-Lez	feat(Tactic/Simproc/Divisors): add `simproc`s to compute the divisors of a natural number.	We add some `simproc`s to compute the `Nat.divisors` and `Nat.properDivisors`. Co-authored-by: Bhavik Mehta --- - [x] depends on: #23025 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta awaiting-author	68/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Simproc/Divisors.lean	3	18	['Paul-Lez', 'b-mehta', 'eric-wieser', 'github-actions', 'j-loreaux', 'mathlib4-dependent-issues-bot']	nobody	0-3573 59 minutes ago	0-3573 59 minutes ago	2-78078 2 days
24114	xroblot author:xroblot	feat(FieldTheory): add the class `IsQuadraticExtension`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra label:t-algebra$	71/7	Mathlib/FieldTheory/Fixed.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/LinearAlgebra/FiniteDimensional/Basic.lean	5	11	['faenuccio', 'github-actions', 'xroblot']	faenuccio assignee:faenuccio	0-2617 43 minutes ago	2-63055 2 days ago	2-63123 2 days
23760	xroblot author:xroblot	feat(NumberField/IsCM): define the `maximalRealSubfield` of a number field	Define the `maximalRealSubfield` of a number field. It is a totally real subfield that contains all other totally real subfields. Add also a couple of instances about the fact that subfields of a totally real field are totally real. --- - [ ] depends on: #24137 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory blocked-by-other-PR WIP	98/4	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	3	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-2576 42 minutes ago	0-2576 42 minutes ago	1-4528 1 day
24189	urkud author:urkud	chore(*): rename `Prod.map` lemmas	Also rename some `Prod.fst` and `Prod.snd` lemmas and add 2 dot notation lemmas. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt ready-to-merge	103/40	Mathlib/Analysis/Normed/Ring/Lemmas.lean,Mathlib/Data/Set/Function.lean,Mathlib/Dynamics/PeriodicPts/Defs.lean,Mathlib/Dynamics/PeriodicPts/Lemmas.lean,Mathlib/Geometry/Manifold/ContMDiffMFDeriv.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/Order/Monotone/Defs.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean,Mathlib/Topology/MetricSpace/Isometry.lean,Mathlib/Topology/UniformSpace/HeineCantor.lean	11	3	['github-actions', 'j-loreaux', 'urkud']	nobody	0-2556 42 minutes ago	0-2556 42 minutes ago	0-18227 5 hours
24177	j-loreaux author:j-loreaux	feat: generalize order properties of the Bochner integral to real ordered Banach spaces	Currently, Mathlib only has order properties of the Bochner integral for `ℝ`-valued functions. This generalizes the fundamental results to real ordered Banach spaces. The motivation is to allow for: ```lean variable {A : Type*} [NonUnitalCStarAlgebra A] [PartialOrder A] [StarOrderedRing A] example {f : ℝ → A} (hf : 0 ≤ᵐ[volume] f) : 0 ≤ ∫ x, f x ∂(volume) := integral_nonneg_of_ae hf ``` --- - [x] depends on: #24175 - [x] depends on: #24176 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis	72/47	Mathlib/MeasureTheory/Integral/Bochner/Basic.lean	1	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	0-2432 40 minutes ago	0-3225 53 minutes ago	0-5075 1 hour
24180	urkud author:urkud	feat(Topology/CompactOpen): basis of the neighborhoods of `f : C(X, Y)`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology ready-to-merge	40/7	Mathlib/Order/CompleteLattice/Basic.lean,Mathlib/Order/Filter/Finite.lean,Mathlib/Topology/CompactOpen.lean	3	2	['github-actions', 'j-loreaux', 'urkud']	nobody	0-2261 37 minutes ago	0-2261 37 minutes ago	0-45282 12 hours
24178	wswartworth author:wswartworth	feat: sort eigenvalues in Analysis.InnerProductSpace.Spectrum	Spectrum.eigenvalues and Spectrum.eigenvectorBasis now give the eigenvalues and eigenvectors in increasing order of eigenvalues, which clears a prior TODO. The new theorem eigenvalues_monotone allows the monotonicity to be used downstream. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis awaiting-author	39/19	Mathlib/Analysis/InnerProductSpace/Spectrum.lean	1	2	['github-actions', 'j-loreaux']	nobody	0-2014 33 minutes ago	0-2014 33 minutes ago	0-48679 13 hours
24174	ADedecker author:ADedecker	chore: semilinearize ContinuousLinearMap.toLinearMap₂	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis ready-to-merge	8/6	Mathlib/Topology/Algebra/Module/StrongTopology.lean	1	1	['github-actions', 'j-loreaux']	nobody	0-1957 32 minutes ago	0-1957 32 minutes ago	0-52874 14 hours
23971	grunweg author:grunweg	feat: LinearEquiv.prodUnique	which is `Equiv.prodUnique` as a linear equivalence. Discovered when working on slice models for defining submanifolds. --- I will also add the ContinuouslinearEquiv of this, once there's mathlib cache so I can find out where to place this. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-author label:t-algebra$	22/0	Mathlib/Algebra/Module/Equiv/Basic.lean	1	5	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux']	nobody	0-1712 28 minutes ago	0-1712 28 minutes ago	6-14724 6 days
24179	plp127 author:plp127	feat: modify Urysohn's lemma to carry data	In preparation for #24096 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology awaiting-author	37/32	Mathlib/Topology/UrysohnsLemma.lean	1	2	['github-actions', 'j-loreaux']	nobody	0-1502 25 minutes ago	0-1502 24 minutes ago	0-46812 13 hours
8977	eric-wieser author:eric-wieser	testing for leanprover/lean4#2940 (`extends flat`)	This can be used as a base commit for other branches testing the effect of `extends flat`. This tests leanprover/lean4#2940 Experiments to try: * What happens if we make `class SomeHomClass` flat? (https://github.com/leanprover-community/mathlib4/pull/8978) * What happens if we make `structure SomeHomClass` flat? (#6791, but needs adapting to the keyword) * What happens if we make (some of) the algebraic hierarchy flat? Unfortunately flat `class`es will run up against https://github.com/leanprover/lean4/pull/2905, so the performance change may be difficult to measure in isolation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1/1	lean-toolchain	1	2	['eric-wieser', 'leanprover-bot']	nobody	494-62315 1 year ago	494-62478 1 year ago	0-0 0 seconds
13158	erdOne author:erdOne	refactor(RingTheory/OreLocalization/Module): remove `LocalizedModule.mk`.	--- - [x] depends on: #13151 - [ ] depends on: #13156 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	283-66982 9 months ago	283-67005 9 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/)	merge-conflict	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	261-86309 8 months ago	265-45352 8 months ago	0-0 0 seconds
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	261-86308 8 months ago	274-82689 9 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/)	merge-conflict	157/122	Mathlib/Topology/Separation.lean	1	1	['github-actions']	nobody	261-86308 8 months ago	273-63638 8 months 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	261-86308 8 months ago	275-77303 9 months 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	261-86308 8 months ago	274-11146 9 months 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	261-86307 8 months ago	274-73918 9 months ago	0-0 0 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	2	['github-actions', 'j-loreaux']	nobody	261-86307 8 months ago	290-82183 9 months ago	0-45204 12 hours
14130	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Scheme): define the affine scheme associated to an elliptic curve	This contribution was created as part of the AIM workshop "Formalizing Algebraic Geometry" in June 2024. Co-authored-by: Michael Stoll Co-authored-by: Junyan Xu --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	workshop-AIM-AG-2024 t-algebraic-geometry t-number-theory merge-conflict awaiting-author WIP	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	3	['Multramate', 'github-actions', 'jcommelin']	nobody	261-86307 8 months ago	273-63903 8 months 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/)	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	261-86307 8 months ago	298-31261 9 months 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	261-86307 8 months ago	295-26604 9 months ago	0-0 0 seconds
14079	adomani author:adomani	draft: mk_all twice in CI, cache fails to be checked	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	40/0	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Test.lean	5	1	['github-actions']	nobody	261-86307 8 months ago	298-74256 9 months 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	261-86307 8 months ago	299-84598 9 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/)	merge-conflict	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	6	['fpvandoorn', 'github-actions', 'leanprover-bot', 'mattrobball']	nobody	261-86307 8 months ago	275-83909 9 months ago	0-0 0 seconds
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	261-86306 8 months ago	303-81215 9 months 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	261-86306 8 months ago	303-81088 9 months ago	0-0 0 seconds
13543	adomani author:adomani	test: automatically undeprecate	A test for `update_deprecations`. There are two files with deprecated declarations, but CI automatically fixes them, so that they pass the noisy tests (as well as passing fail-on-warning `lake build`). --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	261-86306 8 months ago	301-84782 9 months 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	261-86306 8 months ago	273-64037 8 months ago	0-18175 5 hours
13671	adomani author:adomani	test: automatically replace deprecations/unused `set_option ... in`s	…ations--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	574/74	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib.lean,Mathlib/Algebra/Algebra/Operations.lean,Mathlib/Algebra/Homology/Exact.lean,Mathlib/Algebra/Lie/Quotient.lean,Mathlib/Algebra/Module/Submodule/Localization.lean,Mathlib/AlgebraicGeometry/AffineScheme.lean,Mathlib/AlgebraicGeometry/GammaSpecAdjunction.lean,Mathlib/AlgebraicGeometry/Spec.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Basic.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Normed/Group/Quotient.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/SpecialFunctions/Log/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Stirling.lean,Mathlib/CategoryTheory/Limits/Lattice.lean,Mathlib/Combinatorics/SimpleGraph/Regularity/Chunk.lean,Mathlib/Data/Complex/Exponential.lean,Mathlib/Data/Complex/ExponentialBounds.lean,Mathlib/Data/Finset/Basic.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/FieldTheory/RatFunc/Basic.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace/Gluing.lean,Mathlib/GroupTheory/CommutingProbability.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/MonoidLocalization.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean,Mathlib/LinearAlgebra/Isomorphisms.lean,Mathlib/LinearAlgebra/Quotient.lean,Mathlib/LinearAlgebra/QuotientPi.lean,Mathlib/LinearAlgebra/SModEq.lean,Mathlib/LinearAlgebra/Semisimple.lean,Mathlib/Logic/Denumerable.lean,Mathlib/MeasureTheory/Covering/BesicovitchVectorSpace.lean,Mathlib/MeasureTheory/Integral/Marginal.lean,Mathlib/MeasureTheory/Measure/Haar/OfBasis.lean,Mathlib/NumberTheory/Cyclotomic/CyclotomicCharacter.lean,Mathlib/NumberTheory/Cyclotomic/Discriminant.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/Probability/Martingale/OptionalSampling.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Cotangent.lean,Mathlib/RingTheory/LittleWedderburn.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/RingTheory/Smooth/Basic.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/UnusedSetOptionIn.lean,Mathlib/Tactic/UpdateDeprecations.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean,Mathlib/Topology/Connected/PathConnected.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/MetricSpace/Polish.lean,Mathlib/Topology/Order/IntermediateValue.lean,lakefile.lean,scripts/update_deprecations.lean,test/UnusedSetOptionIn.lean,test/UpdateDeprecations.lean	69	1	['github-actions']	nobody	261-86306 8 months ago	312-80964 10 months ago	0-0 0 seconds
12608	eric-wieser author:eric-wieser	feat: allow `nsmul` / `zsmul` to be omitted again, with a warning	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86305 8 months ago	310-81369 10 months ago	5-72414 5 days
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	261-86305 8 months ago	332-47 10 months 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	261-86305 8 months ago	332-48 10 months 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	261-86305 8 months ago	350-3481 11 months 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	261-86305 8 months ago	319-45450 10 months ago	0-0 0 seconds
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	261-86305 8 months ago	283-67005 9 months 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	261-86305 8 months ago	354-1903 11 months ago	0-0 0 seconds
12465	rosborn author:rosborn	style: Change Subtype.val to (↑)	--- This is a test to see replacing `Subtype.val` with `(↑)` where appropriate. After performing the rewrite, some of the types subtly changed in a difficult to detect manner. Before the change, `openEmbedding' _` had type `OpenEmbedding Subtype.val` where `Subtype.val` expanded as `@Subtype.val α fun x ↦ x ∈ U : ↥U → α`. After the change, `Subtype.val` expands to `@Subtype.val α fun x ↦ x ∈ ↑U : { x // x ∈ ↑U } → α`. This caused some later proofs to fail due to the different definition. In a similar case, within the proof of `mfderiv_coe_sphere_injective` on line 553 `Subtype.val` expanded as `@Subtype.val E fun x ↦ x ∈ (Submodule.span ℝ {↑(-v)})ᗮ : ↥(Submodule.span ℝ {↑(-v)})ᗮ → E`. After changing to `(↑)`, it expanded to `@Subtype.val E fun x ↦ x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ : { x // x ∈ ↑(Submodule.span ℝ {↑(-v)})ᗮ } → E`. One benefit to using `(↑)` was that it lead to a shorter proof as `ContinuousLinearEquiv.coe_coe` could be removed on line 559. In general, this subtle change in types is basically impossible to detect without a tool like leaff. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	50/50	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/CategoryTheory/Generator.lean,Mathlib/CategoryTheory/Limits/Shapes/Types.lean,Mathlib/CategoryTheory/Subobject/Types.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Set/Function.lean,Mathlib/Data/Set/Image.lean,Mathlib/Data/Setoid/Basic.lean,Mathlib/Geometry/Manifold/ContMDiff/Basic.lean,Mathlib/Geometry/Manifold/Instances/Sphere.lean,Mathlib/Geometry/Manifold/LocalInvariantProperties.lean,Mathlib/GroupTheory/Subsemigroup/Operations.lean,Mathlib/LinearAlgebra/LinearIndependent.lean,Mathlib/Order/Directed.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/RingTheory/Artinian.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Surreal/Basic.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/EMetricSpace/Lipschitz.lean,Mathlib/Topology/Germ.lean,Mathlib/Topology/UniformSpace/Basic.lean,Mathlib/Topology/UniformSpace/UniformConvergenceTopology.lean,Mathlib/Topology/UniformSpace/UniformEmbedding.lean	28	1	['eric-wieser', 'rosborn']	nobody	261-86305 8 months ago	350-62096 11 months 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	261-86305 8 months ago	329-52297 10 months ago	0-0 0 seconds
13057	alreadydone author:alreadydone	feat(NumberTheory): characterize elliptic divisibility sequences	Main results: + Every `normEDS` is an elliptic divisibility sequence (EDS). The key proof is `rel₄_of_anti_oddRec_evenRec`, based on my original argument first published on [MathSE](https://math.stackexchange.com/a/4903422/12932) + Conversely, every EDS is equal to some `normEDS` (assuming that the first two terms are not zero divisors) --- - [ ] depends on: #13155 - [x] depends on: #13153 - [x] depends on: #10843 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86305 8 months ago	312-41293 10 months ago	0-34665 9 hours
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	261-86305 8 months ago	275-9502 9 months ago	1-73101 1 day
12773	apnelson1 author:apnelson1	feat(Combinatorics/HypergraphRamsey): Ramsey's theorem for hypergraphs	This PR is an unborked version of #12167, which had some bad merge conflicts. We prove Ramsey's theorem for infinite hypergraphs: for any colouring of the k-subsets of an infinite set S with a finite set of colours, there is an infinite subset T of S whose k-subsets all have the same colour. The finite versions will follow from compactness techniques, but aren't included here. (#12273 is the first step for this). The proof encodes k-subsets as order-embeddings from Fin k rather than as Finsets, as this makes things more convenient, and should extend better to generalizations like the canonical Ramsey theorem. This requires a small amount of API to be added, including some simple instances for `OrderEmbedding`. We also require a result saying that there is a list of all k-subsets of Nat for which the sequence of largest elements is monotone. We do this by adding some new material in Order.Extension.Linear, which has more general applications. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-combinatorics merge-conflict	623/2	Mathlib.lean,Mathlib/Combinatorics/HypergraphRamsey.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Order/Extension/Linear.lean,Mathlib/Order/Hom/Basic.lean,Mathlib/Order/Interval/Finset/Defs.lean,Mathlib/Order/OrderIsoNat.lean,Mathlib/Order/RelClasses.lean,lean-toolchain	9	3	['github-actions', 'loefflerd']	nobody	261-86305 8 months ago	283-67005 9 months ago	39-66196 39 days
12933	grunweg author:grunweg	chore: replace some use of > or ≥ by < or ≤	These were flagged by the linter in #12879: it is easy to simple avoid > or ≥ in hypotheses or `have`s. --- [![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	261-86305 8 months ago	275-9496 9 months ago	0-55655 15 hours
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	261-86305 8 months ago	283-67005 9 months ago	0-15202 4 hours
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/)	merge-conflict	22/0	Mathlib.lean,Mathlib/Command/Linter.lean,Mathlib/Tactic/Common.lean	3	2	['leanprover-bot', 'thorimur']	nobody	261-86304 8 months ago	331-59898 10 months ago	0-0 0 seconds
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-algebra merge-conflict WIP label:t-algebra$	39/0	Mathlib/RingTheory/HahnSeries/Addition.lean	1	0	[]	nobody	261-86304 8 months ago	282-39067 9 months ago	10-75677 10 days
11524	mcdoll author:mcdoll	refactor: Introduce type-class for SchwartzMap	--- There are a lot of other refactors to do (`seminormAux` should have a nicer name and gobble up more theorems from `seminorm`), then one can prove `integrable` and friends with only `SchwartzMapClass`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	139/137	Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Topology/ContinuousFunction/ZeroAtInfty.lean	3	0	[]	nobody	261-86304 8 months ago	394-63864 1 year ago	0-0 0 seconds
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	261-86304 8 months ago	273-64171 8 months ago	1-21749 1 day
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	261-86304 8 months ago	384-38034 1 year ago	1-12270 1 day
12292	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.RingTheory.TensorProduct.MonoidAlgebra) : tensor product of a monoid algebra	* `MonoidAlgebra.rTensorAlgEquiv`: the tensor product of `MonoidAlgebra M α` with `N` is `R`-linearly equivalent to `MonoidAlgebra (M ⊗[R] N) α` * `MonoidAlgebra.scalarRTensorAlgEquiv`, the tensor product of `MonoidAlgebra R α` with `N` is `R`-linearly equivalent to `MonoidAlgebra N α` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	447/0	Mathlib.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/RingTheory/TensorProduct/MonoidAlgebra.lean	3	23	['AntoineChambert-Loir', 'eric-wieser', 'github-actions']	nobody	261-86304 8 months ago	283-67005 9 months ago	6-28213 6 days
12181	adomani author:adomani	lint also `let` vs `have`	This PR is symmetrical to #12157: here we lint for non-`Type`-valued `let`s. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	261-86304 8 months ago	366-77511 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	261-86303 8 months ago	369-13965 1 year ago	1-29105 1 day
10444	urkud author:urkud	doc(IsROrC): expand the docstring	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author documentation	34/0	Mathlib/Data/IsROrC/Basic.lean	1	9	['eric-wieser', 'kbuzzard', 'urkud']	nobody	261-86303 8 months ago	386-72195 1 year ago	1-62352 1 day
10142	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Group): compute range of baseChange	--- - [x] depends on: #9744 - [x] depends on: #10043 - [ ] depends on: #10113 - [ ] depends on: #10126 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-number-theory merge-conflict blocked-by-other-PR	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	3	['Multramate', 'alreadydone', 'leanprover-community-mathlib4-bot']	nobody	261-86303 8 months ago	283-67005 9 months ago	0-0 0 seconds
10113	Multramate author:Multramate	feat(GroupTheory/Submonoid/Operations): define homomorphisms of subgroups induced by homomorphisms of groups	--- [![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$	29/6	Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	2	1	['ocfnash']	ocfnash assignee:ocfnash	261-86303 8 months ago	350-62604 11 months ago	22-57316 22 days
9915	eric-wieser author:eric-wieser	refactor: Add norm_num machinery for NNRat	This splits the previous `isRat` primitive into `isNNRat` and `isNegNNRat`, where only the latter carries around a `DivisionRing` instance. This means that `norm_num` works on `NNReal` and `NNRat`. --- - [x] depends on: #9951 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI t-meta merge-conflict please-adopt WIP label:t-algebra$	512/116	Mathlib/Data/Nat/Parity.lean,Mathlib/Tactic/NormNum/Basic.lean,Mathlib/Tactic/NormNum/BigOperators.lean,Mathlib/Tactic/NormNum/Eq.lean,Mathlib/Tactic/NormNum/Ineq.lean,Mathlib/Tactic/NormNum/Inv.lean,Mathlib/Tactic/NormNum/OfScientific.lean,Mathlib/Tactic/NormNum/Pow.lean,Mathlib/Tactic/NormNum/Result.lean,Mathlib/Tactic/Positivity/Core.lean,test/norm_num.lean	11	1	['leanprover-community-mathlib4-bot']	nobody	261-86303 8 months ago	376-85226 1 year ago	0-0 0 seconds
10126	Multramate author:Multramate	feat(GroupTheory/GroupAction/Basic): define homomorphisms of fixed subgroups induced by homomorphisms of groups	--- - [ ] depends on: #10043 - [ ] depends on: #10113 [![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$	81/12	Mathlib/GroupTheory/GroupAction/Basic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Submonoid/Operations.lean	3	1	['leanprover-community-mathlib4-bot']	nobody	261-86303 8 months ago	283-67005 9 months ago	0-0 0 seconds
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	261-86303 8 months ago	273-64760 8 months 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	261-86303 8 months ago	283-67005 9 months 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	261-86303 8 months ago	283-67005 9 months ago	64-12826 64 days
10655	BoltonBailey author:BoltonBailey	feat: one time pad string diagram	String-diagrammatic proof of OTP --- - [x] depends on: #10581 [Defines the diagram widget] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	834/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Widget/StringDiagram.lean,scripts/noshake.json,test/StringDiagram.lean,widget/src/penrose/monoidal.dsl,widget/src/penrose/monoidal.sty	7	1	['leanprover-community-mathlib4-bot']	nobody	261-86303 8 months ago	unknown	unknown
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	261-86303 8 months ago	323-23562 10 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/)	new-contributor t-category-theory 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	261-86303 8 months ago	317-81349 10 months ago	1-20125 1 day
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	261-86303 8 months ago	326-3124 10 months 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	261-86303 8 months ago	417-24436 1 year 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/)	merge-conflict WIP	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	261-86302 8 months ago	unknown	unknown
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	261-86302 8 months ago	350-61086 11 months ago	0-0 0 seconds
9571	linesthatinterlace author:linesthatinterlace	fix(Data/Fin/Tuple/Basic): Refactor snoc and cons proofs.	The current definition of snoc does not use `lastCases`. It can (and should!) This patch chanegs this, and makes related proof optimisations. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	138/154	Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Curry.lean,Mathlib/LinearAlgebra/Multilinear/Basis.lean,Mathlib/Logic/Equiv/Fin.lean,Mathlib/ModelTheory/Algebra/Field/Basic.lean,Mathlib/ModelTheory/Semantics.lean	6	0	[]	nobody	261-86302 8 months ago	378-75234 1 year ago	0-0 0 seconds
9642	eric-wieser author:eric-wieser	refactor(Analysis/Normed/{Group/Field}/Basic): Let `extends` generate the repeated fields	New-style structure shenanigans mean that instance constructors randomly complain about a missing field that can be found with `__ : MetricSpace _ := infer_instance`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) I will write a longer PR description for this once CI is happy	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	261-86302 8 months ago	439-66204 1 year ago	0-0 0 seconds
8536	jjaassoonn author:jjaassoonn	characteristic predicate of tensor product	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	261-86302 8 months ago	410-58617 1 year 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/)	merge-conflict awaiting-author	52/46	Mathlib/MeasureTheory/Measure/Haar/Basic.lean	1	0	[]	nobody	261-86302 8 months ago	283-67005 9 months ago	0-0 0 seconds
8616	eric-wieser author:eric-wieser	feat(Algebra/FreeAlgebra): add right action and `IsCentralScalar`	--- - [ ] depends on: #8652 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict label:t-algebra$	30/8	Mathlib/Algebra/FreeAlgebra.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	261-86302 8 months ago	283-67005 9 months ago	0-0 0 seconds
8503	thorimur author:thorimur	feat: meta utils for `refine?`	This PR introduces some metaprogramming infrastructure and utilities that are necessary for `refine?` (#8364). * `elabTermWithHoles'` (and `withCollectingNewGoalsFrom'`): a more configurable version of `elabTermWithHoles`, which allows: preserving the initial mvar type; not tagging untagged goals; and postponing mvars. * Some `Syntax` and `TSyntax` functionality, including: * `TSyntax.map`(`M`), for acting on `TSyntax` with functions `f : Syntax -> (m) Syntax` * Range operations: `includes` and `isEqByRange` * `setTrailingInfoBy?` and `unsetOriginalTrailing`, which is like `unsetTrailing`, but behaves as expected. * `Term.withoutModifyingState`, which does not allow unknown mvarIds to escape via the infotree * `hasNewErrors`, which runs a monad computation and returns the value along with `true` or `false` depending on whether new error messages have been logged * the option `pp.anonymousMVarSuffixes`, which can be set to `false` to replace all numeric suffixes of anonymous mvars with `✝`, which is useful in tandem with `#guard_msgs` for tests (but is essentially a workaround—although it can make some tactic states more legible). --- I'm open to suggestions on the location and name of the option/delaborator used for trimming the numeric suffixes of anonymous mvar names (which is used in the tests)—including whether or not it should exist in the first place, as it's essentially just a workaround. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86302 8 months ago	464-10200 1 year ago	38-46649 38 days
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	261-86302 8 months ago	354-76508 11 months 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	261-86302 8 months ago	266-81371 8 months ago	0-0 0 seconds
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	261-86302 8 months ago	513-5080 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	261-86302 8 months ago	443-8030 1 year ago	7-6153 7 days
9229	eric-wieser author:eric-wieser	refactor(Algebra/GradedMonoid): Use `HMul` to define `GMul`	This make the notation much nicer, but I'm pretty sure this is a bad idea for performance / ambiguity reasons. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86302 8 months ago	425-76019 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	261-86302 8 months ago	445-20299 1 year ago	19-26304 19 days
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	261-86302 8 months ago	283-67005 9 months ago	16-24540 16 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-algebra merge-conflict label:t-algebra$	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	261-86302 8 months ago	295-74219 9 months 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	261-86302 8 months ago	450-3751 1 year ago	0-0 0 seconds
9354	chenyili0818 author:chenyili0818	feat: monotonicity of gradient on convex real-valued functions	This file is based on Mathlib.Analysis.Calculus.Gradient.Basic, and describes the calculation properties co-authored-by: Ziyu Wang [tropicalfish910@gmail.com](mailto:tropicalfish910@gmail.com) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author	540/0	Mathlib.lean,Mathlib/Analysis/Convex/ConvexFunction.lean	2	15	['github-actions', 'winstonyin']	nobody	261-86302 8 months ago	392-52991 1 year ago	22-72922 22 days
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	261-86302 8 months ago	363-36031 11 months ago	0-0 0 seconds
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	261-86302 8 months ago	449-78546 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	261-86302 8 months ago	311-64956 10 months ago	29-65537 29 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	261-86302 8 months ago	410-58617 1 year ago	5-6524 5 days
8582	eric-wieser author:eric-wieser	wip	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	3/7	Mathlib/Algebra/Category/AlgebraCat/Monoidal.lean,Mathlib/LinearAlgebra/TensorProduct.lean	2	4	['eric-wieser', 'leanprover-bot']	nobody	261-86302 8 months ago	512-73158 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	261-86302 8 months ago	320-43327 10 months 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	261-86302 8 months ago	295-74204 9 months 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	261-86301 8 months ago	283-67005 9 months ago	6-59794 6 days
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	261-86301 8 months ago	378-74733 1 year 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	261-86301 8 months ago	391-49567 1 year ago	30-30522 30 days
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	261-86301 8 months ago	455-65206 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	261-86301 8 months ago	592-60324 1 year ago	0-0 0 seconds
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	261-86301 8 months ago	273-65018 8 months 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	261-86301 8 months ago	283-67005 9 months 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	261-86301 8 months ago	283-67005 9 months 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	261-86301 8 months ago	439-26598 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	261-86301 8 months ago	423-35313 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	261-86301 8 months ago	282-39760 9 months ago	1-85757 1 day
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	261-86301 8 months ago	283-67005 9 months ago	0-0 0 seconds
7649	eric-wieser author:eric-wieser	wip: instead of `suppress_compilation`, use `implemented_by`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	7/14	Mathlib/LinearAlgebra/BilinearForm/TensorProduct.lean,Mathlib/LinearAlgebra/QuadraticForm/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct.lean	5	0	[]	nobody	261-86301 8 months ago	404-6234 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	261-86301 8 months ago	464-67737 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	261-86301 8 months ago	323-63942 10 months ago	0-0 0 seconds
7849	thorimur author:thorimur	testing: bench nightly testing for lean4#2712	A baseline bench for #7830. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	18/18	Mathlib/Algebra/Star/CHSH.lean,Mathlib/CategoryTheory/Yoneda.lean,Mathlib/Data/List/Sublists.lean,lake-manifest.json,lakefile.lean,lean-toolchain	6	2	['leanprover-bot', 'thorimur']	nobody	261-86301 8 months ago	544-18857 1 year 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/)	merge-conflict please-adopt	16/4	Mathlib/Algebra/Lie/SkewAdjoint.lean,Mathlib/Algebra/Lie/Subalgebra.lean	2	3	['eric-wieser', 'ericrbg']	nobody	261-86301 8 months ago	406-80241 1 year ago	0-0 0 seconds
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	261-86301 8 months ago	537-26342 1 year ago	0-72515 20 hours
7932	eric-wieser author:eric-wieser	refactor(Algebra/TrivSqZeroExt): replace with a structure	This is dogfooding my claim that "one-field structures are the lesser evil in Lean 4". This runs into the `simp [(stupid_parens)]` bug; or rather, a particular nasty instance of it where the offending simp call is inside `@[simps]`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86301 8 months ago	283-67005 9 months ago	0-0 0 seconds
7962	eric-wieser author:eric-wieser	feat: `DualNumber (Quaternion R)` as a `CliffordAlgebra`	This provides a clifford algebra isomorphic to the dual quaternions --- - [x] depends on: #7934 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86301 8 months ago	273-64890 8 months 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	261-86301 8 months ago	578-54161 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	261-86301 8 months ago	319-10893 10 months ago	0-0 0 seconds
7875	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'Parcly-Taxel', 'jcommelin', 'leanprover-bot']	nobody	261-86301 8 months ago	283-67005 9 months 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	261-86301 8 months ago	283-67005 9 months ago	35-56459 35 days
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	261-86301 8 months ago	536-5741 1 year ago	0-62955 17 hours
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	261-86300 8 months ago	293-59895 9 months ago	0-0 0 seconds
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	0	[]	nobody	261-86300 8 months ago	470-20092 1 year ago	0-0 0 seconds
6590	mcdoll author:mcdoll	feat: composition of LinearPMaps	This PR changes the definition of the composition to allow composition of arbitrary LinearPMaps by restricting the domains appropriately. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	51/7	Mathlib/LinearAlgebra/LinearPMap.lean,lean-toolchain	2	3	['ADedecker', 'digama0', 'mcdoll']	nobody	261-86300 8 months ago	536-6507 1 year ago	3-26416 3 days
5934	eric-wieser author:eric-wieser	feat: port Data.Rat.MetaDefs	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) This needs some eyes from people familiar with Qq	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	261-86300 8 months ago	431-73289 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	261-86300 8 months ago	612-53941 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	261-86300 8 months ago	302-83728 9 months ago	0-0 0 seconds
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	261-86300 8 months ago	320-43390 10 months ago	0-0 0 seconds
6633	adomani author:adomani	feat(..Polynomial..): `MvPolynomial`s have no zero divisors	This PR continues #6627, placing the `NoZeroDivisors` instance on `MvPolynomial`s and removing auxiliary intermediate results that are no longer needed. Affected files: ``` Data/MvPolynomial/Basic.lean Data/Polynomial/RingDivision.lean RingTheory/Polynomial/Basic.lean ``` --- - [ ] 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	261-86300 8 months ago	608-47825 1 year ago	0-19160 5 hours
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	261-86300 8 months ago	613-3037 1 year ago	0-4269 1 hour
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	261-86300 8 months ago	300-82111 9 months ago	43-56043 43 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	261-86300 8 months ago	682-11216 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	261-86300 8 months ago	584-19275 1 year ago	0-0 0 seconds
4785	thorimur author:thorimur	feat: ExprWithLevels	This introduces `ExprWithLevels`, a means of emulating universe polymorphism for non-constants during metaprogramming. [Description pending] - [ ] depends on: #4786 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86300 8 months ago	326-3124 10 months 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` * `$LLM_MODELS/7B/ggml-model-q4_0.bin` ``` Currently there are not user-configurable hooks to pick which LLM to use: it checks the conditions described in those bullet points, and takes the first one it finds. (i.e. if you want to use the LLaMa `7B/ggml-model-q4_0.bin`, you have to remove your OpenAI API key!). However a tactic in a downstream project (e.g. mathlib) can specify which interface and model it wants to use, or just call `findChatBot` for the behaviour described in that message. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	180/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Formalize.lean,lake-manifest.json,lakefile.lean,test/formalize.lean	6	2	['digama0', 'jcommelin']	nobody	261-86300 8 months ago	582-3028 1 year ago	124-45187 124 days
5133	kmill author:kmill	feat: IntermediateField adjoin syntax for sets of elements	Adds support for both `F⟮S⟯` and `F⟮α⟯`. The term `x` in `F⟮x⟯` is elaborated, and if it has type `Set _` the first interpretation is used, and otherwise the second is. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	110/55	Mathlib/FieldTheory/Adjoin.lean	1	0	[]	nobody	261-86300 8 months ago	617-38164 1 year 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	261-86300 8 months ago	283-67005 9 months ago	83-76369 83 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	261-86300 8 months ago	283-67005 9 months 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	261-86300 8 months ago	526-75897 1 year ago	9-67365 9 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	261-86300 8 months ago	283-67005 9 months ago	5-55287 5 days
6328	FR-vdash-bot author:FR-vdash-bot	chore: make some instance about `Sub...Class` lower priority	Many similar instances have been marked as lower priority. I'd like to see if this would make things faster. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86300 8 months ago	536-6508 1 year 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/)	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	261-86300 8 months ago	614-34692 1 year ago	0-0 0 seconds
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	261-86300 8 months ago	488-31767 1 year ago	0-0 0 seconds
6307	yuma-mizuno author:yuma-mizuno	refactor(CategoryTheory/Monoidal): add whiskering operators	We introduce whiskering operators. This allows us to introduce a simp-normal form for morphisms in monoidal categories. Rewriting into simp-normal forms is especially useful when combined with the coherence tactic. --- - [x] depends on: #6420 - [x] depends on: #8191 - [x] depends on: #9988 - [x] depends on: #9991 - [x] depends on: #9995 - [x] depends on: #10061 - [x] depends on: #10078 - [x] depends on: #10898 - [x] depends on: #10912 - [x] depends on: #11223 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86300 8 months ago	277-12729 9 months ago	0-0 0 seconds
6403	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'Vierkantor', 'digama0', 'eric-wieser', 'j-loreaux', 'leanprover-bot']	nobody	261-86300 8 months ago	320-43370 10 months ago	13-18399 13 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	261-86300 8 months ago	283-67005 9 months ago	102-21189 102 days
6079	eric-wieser author:eric-wieser	fix: deduplicate variables	`variables {A} [Ring A]` meant "update the binder of `A`" in Lean 3, but now means "create a duplicate variable called `A`" (or at least, does so when inspecting the state within the variables line). This removes a number of porting notes that were stumbling over this behavior. [Related Zulip thread](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/unexpected.20.60variable.60.20behaviour.3F/near/360154080) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	261-86300 8 months ago	283-67005 9 months 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	261-86300 8 months ago	283-67005 9 months 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	261-86299 8 months ago	514-11085 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	257-62609 8 months ago	257-62609 8 months 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	257-56289 8 months ago	257-56290 8 months 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	254-74278 8 months ago	254-74278 8 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/)	merge-conflict WIP	71/0	Mathlib/Tactic/Linter/Lint.lean	1	1	['github-actions']	nobody	254-57604 8 months ago	273-44969 8 months ago	0-8 8 seconds
14994	kim-em author:kim-em	profiling: skipKernelTC		merge-conflict	2/1	lakefile.lean	1	3	['github-actions', 'kim-em', 'leanprover-bot']	nobody	253-20022 8 months ago	253-20022 8 months 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	249-67372 8 months ago	255-17994 8 months ago	0-0 0 seconds
10717	joelriou author:joelriou	feat(Algebra/Homology): the total complex of a tricomplex	Given a triple homological complex, there are two ways to obtain a single complex. Under certain assumptions on signs, it is shown in this PR that they are isomorphic. --- - [x] depends on: #10711 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict WIP	968/8	Mathlib.lean,Mathlib/Algebra/Homology/ComplexShapeSigns.lean,Mathlib/Algebra/Homology/HomologicalTricomplex.lean,Mathlib/Algebra/Homology/TotalComplex.lean,Mathlib/Algebra/Homology/TotalComplexShift.lean	5	3	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	249-62911 8 months ago	249-62911 8 months ago	0-0 0 seconds
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	17	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	249-58619 8 months ago	249-58619 8 months ago	41-49960 41 days
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	249-44222 8 months ago	249-44222 8 months 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	249-43454 8 months ago	249-43454 8 months ago	0-8 8 seconds
7565	shuxuezhuyi author:shuxuezhuyi	feat(Topology/Algebra/Order): extend homeomorphism of `Ioo` to `Icc`	We extend the homeomorphisms between open intervals to homeomorphisms between the closed intervals. --- - [ ] depends on: #7018 - [ ] depends on: #7351 - [ ] depends on: #7564 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	247-79954 8 months ago	247-79954 8 months ago	0-0 0 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	247-79845 8 months ago	247-79845 8 months 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	247-79378 8 months ago	247-79378 8 months 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	247-77777 8 months ago	247-77777 8 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/)	merge-conflict	108/1	Mathlib/Analysis/InnerProductSpace/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean	2	1	['github-actions']	nobody	247-74716 8 months ago	247-74716 8 months 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	247-64541 8 months ago	247-64541 8 months ago	0-0 0 seconds
14542	linesthatinterlace author:linesthatinterlace	feat(GroupTheory/Perm/Support): Redefine `support` to be a `Set`, removing finiteness requirements.	This refactors GroupTheory/Perm/Support.lean, and then makes minimally consequential fixes to others statements and proofs as a result. --- This was a challenging PR to get to pass CI. There is absolutely no need that I can see that the definition of `Equiv.Perm.support` needs to have a finiteness condition, but because of the way it is currently uses, that assumption is everywhere, including in some deeply complex proofs. As there is often a need to refer to the cardinality of the support, I've added in an appropriate definition for this - this definition is noncomputable but has a computable form under the same conditions under which it was previously used. I don't think this is an ideal way of doing this but I think a more full refactoring will take more time and thinking than I have. In general I think we should avoid excessive decidable equality and finiteness conditions creeping in when they are not necessary, but this specific PR was motivated by a need to use the notion of support for a permutation whose support is finite but whose underlying domain of action is 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$	847/566	Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Analysis/Complex/Polynomial.lean,Mathlib/GroupTheory/Perm/Basic.lean,Mathlib/GroupTheory/Perm/Closure.lean,Mathlib/GroupTheory/Perm/ClosureSwap.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/GroupTheory/Perm/Cycle/Concrete.lean,Mathlib/GroupTheory/Perm/Cycle/Factors.lean,Mathlib/GroupTheory/Perm/Cycle/PossibleTypes.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/GroupTheory/Perm/Finite.lean,Mathlib/GroupTheory/Perm/List.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean	16	11	['YaelDillies', 'github-actions', 'linesthatinterlace']	nobody	246-76604 8 months ago	246-76604 8 months ago	10-27300 10 days
14308	grhkm21 author:grhkm21	feat(Algebra/Category): Direct construction of colimits in algebraic categories	(Below I only write about colimits since that's what I'm familiar with after working on it the last few days, but maybe it's the same for other categorical constructions) Main feature: Construct colimits in `AddCommGrp`/`ModuleCat`/`FGModuleCat`(/...) directly as coequalizer (i.e. cokernel i.e. quotient) of two maps, allowing one to say $\coprod_j M_j \cong $ Currently, if you look at how colimits are constructed for [AddCommGrp](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L69-L92), you see this massive block of code of all relations generating the quotient relation, but that's kind of bad, you can't say anything concretely about it. Also as noted in the TODOs of a few files: ``` TODO: In fact, in `ModuleCat R` there is a much nicer model of colimits as quotients of finitely supported functions, and we really should implement this as well. ``` I wrote it down [here](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Braided.20left.20rigid.20categories.20are.20right.20rigid/near/447490672), and have formalised it* in a small file already [here](https://gist.github.com/grhkm21/5b2d938753c0ce0900d21c93a39e3b7d#file-addcommgrpcolimits-lean-L162-L163) (I also have a `ModuleCat` version, and proving existence of colimits in `FGModuleCat` from it). Usually I will try to merge the file into Mathlib directly (preferably in one sitting), but I have been trying for a while now and been struggling. One issue is I am struggling to understand universes, which I asked [here](https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Universe.20constraints!/near/448049266) along with many other places. A more concrete issue is that - [ ] FGModuleCat (and `FullSubcategory` in general) requires morphism and objects to be on the same universe, whereas generally `Category.{v, u}` don't. So that seems to limit what I can express, and maybe I have to fix it first. Here are a few more TODOs just so I don't forget, probably done before the one above: - [ ] Generalise `cokernelIsoQuotient` to other categories. - [ ] Also prove `coproductIsoDirectSum` - [ ] Also prove coequalizer (f + h) (g + h) ~ coequalizer f g ~ cokernel (f - g) 0 - [ ] Fix typo `FGModuleCatCat` If anyone is familiar with universe stuff and can answer my many questions that'll be great too. I need help understanding just [these five lines](https://github.com/leanprover-community/mathlib4/blob/master/Mathlib/Algebra/Category/Grp/Colimits.lean#L267-L271)	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	246-76562 8 months ago	246-76562 8 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-algebra merge-conflict label:t-algebra$	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	246-76477 8 months ago	246-76477 8 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-algebra merge-conflict label:t-algebra$	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	246-76476 8 months ago	246-76476 8 months ago	0-0 0 seconds
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-algebra merge-conflict label:t-algebra$	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	246-76476 8 months ago	246-76476 8 months 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	246-76359 8 months ago	246-76359 8 months 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	246-76222 8 months ago	246-76222 8 months 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	246-76207 8 months ago	246-76207 8 months 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	246-76169 8 months ago	246-76169 8 months 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	246-76159 8 months ago	246-76159 8 months 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	246-76145 8 months ago	246-76145 8 months 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	246-76135 8 months ago	246-76135 8 months ago	0-0 0 seconds
12310	BoltonBailey author:BoltonBailey	feat: add Tropically bound polynomials	Co-authored-by: Junyan Xu --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict awaiting-author label:t-algebra$	31/0	Mathlib.lean,Mathlib/Algebra/Tropical/TropicallyBoundPolynomial/Basic.lean	2	0	[]	nobody	246-76096 8 months ago	246-76096 8 months 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	246-76054 8 months ago	246-76054 8 months 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	246-76019 8 months ago	246-76019 8 months 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	246-75987 8 months ago	246-75987 8 months ago	0-0 0 seconds
10283	linesthatinterlace author:linesthatinterlace	feat(Data/Fin/OrderHom): Extend lemmas to simplex results	Add lemmas necessary to prove simplicial complex results in elementary terms --- This is a WIP PR and should not be evaluated at this time. I am pushing it so that another author has easy access to it, but I am currently on holiday and am unable to prepare it for merging at this time. It is a refactored and improved version of #9145, which is now mostly (but not entirely) redundant. It is possible that this PR will be broken up in turn due to the noted WIP nature. - [x] depends on: #10166 which moves out Data/Fin/OrderHom into its own file. - [x] depends on: #10163 which renames many key lemmas. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	673/51	Mathlib/AlgebraicTopology/SimplexCategory.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/OrderHom.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Sym/Card.lean	5	11	['github-actions', 'jstoobysmith', 'leanprover-community-mathlib4-bot', 'linesthatinterlace']	nobody	246-75955 8 months ago	246-75955 8 months 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	246-75841 8 months ago	246-75841 8 months ago	0-0 0 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	246-75783 8 months ago	246-75783 8 months 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	246-75664 8 months ago	246-75664 8 months 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	246-75632 8 months ago	246-75632 8 months 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	246-75606 8 months ago	246-75606 8 months ago	11-1960 11 days
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	246-75595 8 months ago	246-75595 8 months ago	0-0 0 seconds
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	246-75551 8 months ago	246-75551 8 months 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	246-75545 8 months ago	246-75545 8 months ago	6-70040 6 days
8195	newell author:newell	Feat (GroupTheory.SpecificGroups.PresentedDihedral): 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-algebra merge-conflict WIP label:t-algebra$	206/2	Mathlib/GroupTheory/PresentedGroup.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean	2	6	['kbuzzard', 'newell']	nobody	246-75419 8 months ago	246-75419 8 months ago	0-0 0 seconds
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	246-75413 8 months ago	246-75413 8 months ago	0-0 0 seconds
7739	mcdoll author:mcdoll	feat(LinearAlgebra/LinearPMap): difference of inverses	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	126/7	Mathlib/LinearAlgebra/LinearPMap.lean,lean-toolchain	2	2	['digama0', 'eric-wieser']	nobody	246-75385 8 months ago	246-75385 8 months ago	0-0 0 seconds
15586	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	245-21421 8 months ago	245-21421 8 months 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	245-21421 8 months ago	245-21421 8 months ago	0-0 0 seconds
13026	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra awaiting-CI merge-conflict awaiting-author label:t-algebra$	6/1	Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/FieldTheory/SplittingField/Construction.lean	2	2	['BoltonBailey', 'grunweg']	nobody	244-76999 8 months ago	244-76999 8 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/)	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	243-42869 8 months ago	273-64629 8 months ago	2-10495 2 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	243-42690 8 months ago	283-67005 9 months ago	1-84718 1 day
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	4	['github-actions', 'grunweg', 'leanprover-bot', 'mattrobball']	nobody	243-42663 8 months ago	293-78076 9 months ago	0-0 0 seconds
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	243-42549 8 months ago	283-67005 9 months 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	243-42448 8 months ago	283-67005 9 months 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	243-42240 8 months ago	243-42240 8 months 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	243-41551 8 months ago	243-41551 8 months 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	243-20114 8 months ago	243-20114 8 months 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	242-83638 7 months ago	243-1152 8 months 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	242-63602 7 months ago	247-79844 8 months ago	54-52408 54 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/)	new-contributor t-algebra t-topology merge-conflict awaiting-author label:t-algebra$	462/2	Mathlib/AlgebraicTopology/SimplicialSet.lean	1	15	['YaelDillies', 'jcommelin', 'jstoobysmith', 'kim-em', 'linesthatinterlace']	nobody	242-63436 7 months ago	273-64761 8 months ago	14-58814 14 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	242-52655 7 months ago	243-41802 8 months 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	240-65885 7 months ago	283-67005 9 months 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	240-65876 7 months ago	247-79846 8 months 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	240-65856 7 months ago	246-76451 8 months 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	240-65694 7 months ago	319-55284 10 months 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	234-79298 7 months ago	234-79298 7 months ago	26-39367 26 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$	212/174	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/Complex/AbelLimit.lean,Mathlib/Analysis/CstarAlgebra/ContinuousFunctionalCalculus/Instances.lean,Mathlib/Analysis/InnerProductSpace/Basic.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/Complex/Abs.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.lean,Mathlib/Probability/Distributions/Gaussian.lean,Mathlib/Topology/ContinuousFunction/StarOrdered.lean,test/positivity.lean	31	9	['eric-wieser', 'github-actions', 'kmill', 'urkud']	nobody	234-77633 7 months ago	234-77633 7 months ago	0-0 0 seconds
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	233-47574 7 months ago	233-47574 7 months ago	0-8 8 seconds
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	1967/3	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.failed_attempt,Mathlib/CategoryTheory/Abelian/DiagramLemmas/Horseshoe.lean,Mathlib/CategoryTheory/Abelian/LeftDerived.lean,Mathlib/RingTheory/Flat/Basic.lean	9	21	['erdOne', 'github-actions', 'jjaassoonn', 'joelriou']	nobody	233-47542 7 months ago	342-82963 11 months ago	0-0 0 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	231-70788 7 months ago	231-70789 7 months ago	0-0 0 seconds
14923	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Jacobian): add equivalences between points and explicit WithZero types	--- - [ ] depends on: #14627 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-number-theory merge-conflict blocked-by-other-PR	262/66	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,scripts/style-exceptions.txt	4	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	231-70661 7 months ago	231-70661 7 months ago	0-0 0 seconds
15161	adomani author:adomani	find intros vars	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	83/0	Mathlib/Tactic/Linter/Lint.lean,test/Lint.lean	2	1	['github-actions']	nobody	231-69776 7 months ago	231-69776 7 months 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	231-69776 7 months ago	231-69776 7 months ago	0-0 0 seconds
15213	adomani author:adomani	dev: add Mathlib.Tactic.Linter.ForallIntro	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	602/0	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/ForallIntro.lean,test/ForallIntro.lean	5	2	['adomani', 'github-actions']	nobody	231-69775 7 months ago	231-69775 7 months ago	0-0 0 seconds
14266	dagurtomas author:dagurtomas	feat(AlgebraicGeometry): define a pretopology from a RingHomProperty	--- [![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	101/0	Mathlib/AlgebraicGeometry/Morphisms/RingHomProperties.lean,Mathlib/CategoryTheory/Sites/MorphismProperty.lean,Mathlib/CategoryTheory/Sites/Pretopology.lean	3	1	['github-actions']	nobody	228-79956 7 months ago	228-79956 7 months 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	227-63290 7 months ago	227-63290 7 months 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	227-63290 7 months ago	227-63290 7 months 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	222-58034 7 months ago	222-58037 7 months 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	222-18171 7 months ago	unknown	unknown
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	221-85631 7 months ago	221-85631 7 months ago	0-0 0 seconds
6475	joneugster author:joneugster	refactor(LinearAlgebra/Span): replace ∙ with • as notation for `span R {x}`	Change the notation for `Submodule.span R {x}` from `R ∙ x` to the bullet `R • x`, which is also used for scalar multiplication. --- (this was an experiment originating from a [Zulip discussion](https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/.2E.C2.B7.E2.AC.9D.20.5Brant.5D), I don't have a clear opinion if this is actually a desired thing to do...) Generally this works and Lean seems to do fine figuring out the difference between `r • x` and `R • x` (The former is scalar multiplication in an `R`-module `M`, the latter is the `Submodule R M` generated by `x`). Encountered a few regressions that should be considered (the first two might be also bugs that could be looked at independently): 1. `(· • ·)`, and general simple function syntax, does not work as notation for `HSMul.hSMul` anymore. For this reason, I introduced the notation `scoped` to minimise the effect of this. Now it's only a problem if you `open Span`. Note that `fun x₁ x₂ ↦ x₁ • x₂` works flawlessly all the time. 4. `change` and `convert` have troubles to deal with the two competing notations. `have := _; convert this` works. 5. `R • x - y` is not valid anymore and needs parentheses: `R • (x - y)`. I do think this actually helps readability, so I don't mind. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	220-82927 7 months ago	220-82927 7 months 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	220-12063 7 months ago	220-12063 7 months ago	32-30254 32 days
10765	Vierkantor author:Vierkantor	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. --- - [x] depends on: #12907 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author help-wanted	275/108	Mathlib/RingTheory/MvPolynomial/Basic.lean,Mathlib/Tactic/Polyrith.lean,Mathlib/Tactic/Ring/Basic.lean,Mathlib/Tactic/Ring/RingNF.lean,test/ring_mod_char.lean	5	7	['Vierkantor', 'YaelDillies', 'github-actions', 'joneugster', 'leanprover-community-mathlib4-bot']	joneugster assignee:joneugster	219-68157 7 months ago	219-68157 7 months ago	28-28613 28 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 merge-conflict awaiting-author	184/3	Mathlib.lean,Mathlib/Data/List/Basic.lean,Mathlib/Data/List/Enum.lean,Mathlib/Data/List/EraseIdx.lean,Mathlib/Data/List/OffDiag.lean	5	3	['eric-wieser', 'github-actions', 'urkud']	nobody	216-69278 7 months ago	216-69278 7 months ago	0-0 0 seconds
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	216-40996 7 months ago	216-40996 7 months 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	216-21296 7 months ago	216-21296 7 months 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	215-12073 7 months ago	215-34048 7 months ago	119-10687 119 days
12087	JADekker author:JADekker	feat : complete API for K-Lindelöf spaces	--- - [ ] depends on: #11800 (which is now awaiting a design decision) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	215-11815 7 months ago	215-11815 7 months ago	1-72084 1 day
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	213-78250 7 months ago	213-78250 7 months 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	211-66859 6 months ago	211-66859 6 months ago	0-14835 4 hours
10075	dupuisf author:dupuisf	refactor: generalize `MonoidHom.ker` and `MonoidHom.range` to `MonoidHomClass`	With this refactor, `MonoidHom.ker` and `MonoidHom.range` will be defined for any `MonoidHomClass` type, not just `MonoidHom`s. This brings the design in line with `LinearMap.ker`/`range` and `MonoidHom.mker`/`mrange`. `Subgroup.map`/`comap` are also generalized. As with those previous refactors, the main drawback is the loss of dot notation in many cases. Other than that, the impact is fairly minor given that this is happening is rather basic files. --- [![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$	464/389	Mathlib/Algebra/Category/GroupCat/Abelian.lean,Mathlib/Algebra/Category/GroupCat/Basic.lean,Mathlib/Algebra/Category/GroupCat/Colimits.lean,Mathlib/Algebra/Category/GroupCat/EpiMono.lean,Mathlib/Algebra/Category/GroupCat/Images.lean,Mathlib/Algebra/Category/GroupCat/Kernels.lean,Mathlib/Algebra/Category/GroupCat/Limits.lean,Mathlib/Algebra/Homology/ShortComplex/Ab.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/Normed/Group/Hom.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Data/ZMod/Quotient.lean,Mathlib/FieldTheory/PolynomialGaloisGroup.lean,Mathlib/GroupTheory/Abelianization.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coset.lean,Mathlib/GroupTheory/Finiteness.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/Nilpotent.lean,Mathlib/GroupTheory/NoncommPiCoprod.lean,Mathlib/GroupTheory/PGroup.lean,Mathlib/GroupTheory/Perm/Sign.lean,Mathlib/GroupTheory/Perm/Subgroup.lean,Mathlib/GroupTheory/PushoutI.lean,Mathlib/GroupTheory/QuotientGroup.lean,Mathlib/GroupTheory/SchurZassenhaus.lean,Mathlib/GroupTheory/SemidirectProduct.lean,Mathlib/GroupTheory/Solvable.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/Subgroup/Basic.lean,Mathlib/GroupTheory/Subgroup/Finite.lean,Mathlib/GroupTheory/Subgroup/Saturated.lean,Mathlib/GroupTheory/Subgroup/ZPowers.lean,Mathlib/GroupTheory/Sylow.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/GroupTheory/Transfer.lean,Mathlib/LinearAlgebra/Alternating/DomCoprod.lean,Mathlib/LinearAlgebra/Basic.lean,Mathlib/LinearAlgebra/Matrix/Determinant.lean,Mathlib/MeasureTheory/Function/LpSpace.lean,Mathlib/NumberTheory/ModularForms/CongruenceSubgroups.lean,Mathlib/RingTheory/ClassGroup.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean,Mathlib/RingTheory/Valuation/ValuationSubring.lean,Mathlib/Topology/Algebra/OpenSubgroup.lean,Mathlib/Topology/Algebra/UniformGroup.lean,Mathlib/Topology/Instances/AddCircle.lean	51	2	['dupuisf', 'urkud']	nobody	211-64748 6 months ago	212-9613 7 months ago	8-14499 8 days
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	211-4113 6 months ago	211-4113 6 months 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	210-52158 6 months ago	210-52158 6 months ago	8-1989 8 days
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	209-29824 6 months ago	unknown	unknown
11003	thorimur author:thorimur	chore: migrate to `tfae` block tactic	Migrates to the `tfae` block tactic syntax, eliminating uses of `tfae_have` and `tfae_finish`. --- - [ ] depends on: #11000 - [ ] depends on: #10991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict 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	207-25346 6 months ago	211-4101 6 months ago	0-0 0 seconds
8118	iwilare author:iwilare	feat(CategoryTheory): add dinatural transformations	A starting point to define [dinatural transformations](https://ncatlab.org/nlab/show/dinatural+transformation). This is my first PR so style comments and improvements are very welcome! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	207-2745 6 months ago	207-2746 6 months ago	21-9462 21 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/)	new-contributor t-category-theory 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	207-2621 6 months ago	207-2621 6 months ago	0-0 0 seconds
14203	dagurtomas author:dagurtomas	feat(Algebra/ModuleCat): descent data	--- [![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 please-adopt WIP label:t-algebra$	453/387	Mathlib/Algebra/Category/ModuleCat/Descent.lean,Mathlib/CategoryTheory/Limits/Preserves/Shapes/Equalizers.lean,Mathlib/CategoryTheory/Monad/Adjunction.lean	3	2	['dagurtomas', 'github-actions']	nobody	207-2164 6 months ago	207-2164 6 months ago	0-0 0 seconds
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	206-49496 6 months ago	206-49496 6 months ago	0-0 0 seconds
16387	adomani author:adomani	test: add creator check in new contributor	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	28/12	.github/workflows/label_new_contributor.yml,Mathlib.lean,Mathlib/Algebra/Quandle.lean,Mathlib/EmptyFile.lean	4	1	['github-actions']	nobody	205-63620 6 months ago	205-63620 6 months ago	10-54001 10 days
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/)	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	204-19397 6 months ago	204-19398 6 months ago	7-61243 7 days
17110	FR-vdash-bot author:FR-vdash-bot	chore: deprecate some lemmas about equality	These lemmas were upstreamed to Batteries in https://github.com/leanprover-community/batteries/pull/465. --- - [ ] depends on: https://github.com/leanprover-community/batteries/pull/957 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	blocked-by-batt-PR merge-conflict	20/16	Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Logic/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Tactic/CC/Addition.lean,lake-manifest.json	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	202-51932 6 months ago	202-51934 6 months ago	0-0 0 seconds
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	202-47838 6 months ago	202-47838 6 months ago	0-0 0 seconds
12617	mans0954 author:mans0954	feat(Algebra/Ring/Defs): Add NonUnitalCommSemiring.toNonUnitalNonAssocCommSemiring instance	Adds missing `CommSemiring.toNonUnitalNonAssocCommSemiring` instance. Required for #7569 (specifically [QuadraticMap.linMulLinSelfPosDef](https://github.com/leanprover-community/mathlib4/pull/7569/files#diff-4b8a995fd51c4cb0a5d0ff6413fa1565f87f697d1b552327cfed2c98a4f62f49R1145) ). Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Adding.20an.20instance.20breaks.20.60Mathlib.2ETactic.2ERing.2EBasic.60 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	11/1	Mathlib/Algebra/Ring/Defs.lean,Mathlib/Tactic/Ring/Basic.lean	2	5	['eric-wieser', 'github-actions', 'mans0954']	nobody	202-13169 6 months ago	202-13169 6 months ago	147-10606 147 days
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	201-19498 6 months ago	201-19498 6 months 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	201-17505 6 months ago	201-17505 6 months ago	12-19694 12 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	201-14541 6 months ago	201-14541 6 months ago	4-72805 4 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	198-45474 6 months ago	198-45474 6 months 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	198-45474 6 months ago	198-45475 6 months 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	198-45473 6 months ago	198-45473 6 months ago	0-613 10 minutes
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	194-77494 6 months ago	197-14570 6 months ago	20-15089 20 days
6277	jjaassoonn author:jjaassoonn	Dimension theory	Some results are - The ring Krull dimension and the topological dimension of the prime spectrum of a ring are the same - A field is zero-dimensional and a PID that is not a field is one dimensional - An Artinian ring is zero-dimensional - The Krull dimension of ring $R$ is equal to the supremum of heights of maximal ideals [00KG](https://stacks.math.columbia.edu/tag/00KG) - two definitions of module length agree - A module is finite length iff both artinian and noetherian - length of module $M$ is equal to the sum of length of $N$ and length of $M / N$ where $N$ is a submodule of $M$. - Noetherian ring has only finitely many minimal primes #9088 - In a zero dimensional ring, prime ideals are maximal - Artinian rings has finitely many maximal ideals #9087 - zero-dimensional rings with finitely many prime ideals are products of its localizations: $R \cong \prod_{\mathfrak{p}}R_{\mathfrak{p}}$ - Let $M_0 \le ... \le M_n$, then $l(M_n/ M_0) = l(M_1/M_0) + l(M_2/M_1) + ... + l(M_n/M_{n-1})$ where $l$ denotes module length. - If $f : R \to S$ is a ring homomorphism and $M$ an $S$-module, then $l_R(M) \le l_S(M)$, when $f$ is surjective then they are equal. (Note that this is expressed using `[Algebra R S]` and `RestrictScalars R S M`, instead of a literal ring hom) - Artinian rings are noetherian ring of dimension 0. - For 0-dimensional local ring, its maximal ideal is locally nilpotent - In notherian ring, $I \le \sqrt{J}$ implies $I ^ n \le J$ for some $n$ --- - [x] depends on: #6309 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	194-41879 6 months ago	417-57979 1 year ago *	0-0 0 seconds *
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	193-13037 6 months ago	193-13037 6 months 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	191-59683 6 months ago	191-59683 6 months ago	285-35716 285 days
10190	jstoobysmith author:jstoobysmith	feat(AlgebraicTopology): add Augmented Simplex Category	- Added the definition of the category FinLinOrd of finite linear ordered sets. - Added the definition of the augmented simplex category `AugmentedSimplexCategory`, and showed it is the Skeleton of FinLinOrd. - Showed that the category of augmented simplicial objects defined as a comma category is equivalent to the category of functors from `AugmentedSimplexCategory^\op` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-algebra t-topology t-category-theory merge-conflict WIP label:t-algebra$	720/0	Mathlib.lean,Mathlib/AlgebraicTopology/AugmentedSimplexCategory.lean,Mathlib/AlgebraicTopology/SimplicialObject.lean,Mathlib/Order/Category/FinLinOrd.lean	4	5	['TwoFX', 'YaelDillies', 'joelriou', 'jstoobysmith']	nobody	191-55672 6 months ago	191-55672 6 months ago	7-63215 7 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	191-43346 6 months ago	283-67005 9 months ago	9-20043 9 days
14627	Multramate author:Multramate	feat(AlgebraicGeometry/EllipticCurve/Affine): add equivalences between points and explicit WithZero types	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry t-number-theory merge-conflict awaiting-author	159/52	Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Group.lean	2	9	['Multramate', 'Ruben-VandeVelde', 'github-actions']	nobody	189-65828 6 months ago	189-65828 6 months ago	46-57206 46 days
15916	vihdzp author:vihdzp	feat(SetTheory/Ordinal/CantorNormalForm): Coefficients of CNF as finsupp	We introduce `CNF_coeff b o e`, which returns the coefficient of `b^e` in the Cantor Normal Form of `o`. --- - [ ] depends on: #15915 I'm not sure if `CNF_Alist` and `CNF_coeff` adhere to naming conventions. Naming suggestions welcome. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	152/60	Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	2	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	189-40505 6 months ago	189-40505 6 months ago	0-542 9 minutes
14619	Command-Master author:Command-Master	chore: Merge `Trunc` to `Squash`	Remove `Trunc` and use `Squash` instead --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	189-5624 6 months ago	273-63768 8 months 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	186-66823 6 months ago	186-66823 6 months ago	51-84473 51 days
14160	linesthatinterlace author:linesthatinterlace	feat(Algebra/Group/Action/Defs): Redefine `Function.End`	Function.End is currently defined, semireducibly, as just a function type. This occasionally leads to irritating behaviour where theorems about Function.End don't apply to a statement which is about a function. I am redefining Function.End as a one-field structure and seeing what that breaks, and if it doesn't break too much, I will also add support for coercing Equiv.Perm to it. --- [![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$	22/19	Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/GroupTheory/Perm/Basic.lean	2	3	['github-actions', 'linesthatinterlace', 'riccardobrasca']	nobody	186-66698 6 months ago	186-66698 6 months ago	0-0 0 seconds
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	186-66447 6 months ago	186-66447 6 months ago	3-83049 3 days
6034	mattrobball author:mattrobball	feat (Mathlib.Tactic.FieldSimp) : discharger uses normCast	Use `normCast` to assist the discharger in `fieldSimp`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict awaiting-author	30/11	Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/Tactic/FieldSimp.lean,test/FieldSimp.lean	6	7	['github-actions', 'grunweg', 'mattrobball']	nobody	186-63204 6 months ago	186-63204 6 months ago	1-81851 1 day
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	185-17215 6 months ago	185-17215 6 months 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	184-40129 6 months ago	193-40603 6 months ago *	193-40584 193 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	183-2487 6 months ago	183-2487 6 months ago	0-0 0 seconds
12750	Command-Master author:Command-Master	feat: define Gray code	--- Define binary reflected gray code, both as a permutation of `Nat` and as a permutation of `BitVec n`, and prove some theorems about them. Additionally, remove `@[simp]` from `Nat.bit_false` and `Nat.bit_true`, as `bit0` and `bit1` are deprecated, and add some lemmas to `Bits`, `Bitwise` and `Size`. - [ ] depends on: #12751 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	180-68131 5 months ago	180-68131 5 months ago	6-8380 6 days
12414	adomani author:adomani	test: lint and unlint `·`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	64/14	Archive/Wiedijk100Theorems/CubingACube.lean,Mathlib/Algebra/Module/Submodule/Bilinear.lean,Mathlib/Tactic/Linter/Multigoal.lean,test/Multigoal.lean	4	4	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	178-64672 5 months ago	178-64672 5 months 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	177-36254 5 months ago	177-36254 5 months ago	2-57220 2 days
17757	vihdzp author:vihdzp	refactor(*): generalize typeclass assumptions in morphisms	We remove all algebraic axioms from the definitions of morphisms (i.e. `→+`, `→*`, etc.) and assume only the necessary data to state them. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	86/62	Mathlib/Algebra/Group/Hom/Defs.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/Order/Ring/Unbundled/Nonneg.lean,Mathlib/Algebra/Ring/Hom/Defs.lean	4	1	['github-actions']	nobody	176-41000 5 months ago	176-41000 5 months ago	0-0 0 seconds
16647	eric-wieser author:eric-wieser	feat: partitions of lists	The length of this list is the bell numbers. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-combinatorics merge-conflict	311/0	Mathlib.lean,Mathlib/Data/List/Partition.lean	2	1	['github-actions']	nobody	175-85146 5 months ago	175-85146 5 months ago	0-0 0 seconds
17980	robin-carlier author:robin-carlier	feat(CategoryTheory/Bicategory/Grothendieck): functors between Grothendieck constructions induced by strong natural transforms	Generalize the content of `CategoryTheory/Grothendieck` to pseudofunctor and show that a strong oplax natural transformation of pseudofunctors induces a functor between the Grothendieck contsructions, and that the construction preserves composition and identities. --- The proof of `map_comp_eq` is rather slow and needs a slight increase in heartbeats to go through. It’s probably golfable. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict awaiting-author	143/0	Mathlib/CategoryTheory/Bicategory/Grothendieck.lean	1	2	['github-actions', 'joelriou']	nobody	175-57677 5 months ago	175-57677 5 months ago	0-0 0 seconds
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 - [ ] depends on: #18252 - [ ] depends on: #18253 [![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	520/393	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,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	173-63431 5 months ago	174-30831 5 months ago	0-413 6 minutes
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/)	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	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	172-80233 5 months ago	172-80233 5 months ago	0-179 2 minutes
6533	wupr author:wupr	WIP: feat(GroupTheory/GroupAction/Basic): add pointwise and setwise stabilizers	--- _Work in Progress_ [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	93/0	Mathlib/GroupTheory/GroupAction/Basic.lean	1	0	[]	nobody	171-74924 5 months ago	171-74924 5 months ago	0-0 0 seconds
18202	ADedecker author:ADedecker	chore: refactor algebraic filter bases	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	170-55929 5 months ago	170-55929 5 months ago	0-0 0 seconds
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 - [ ] depends on: #18252 - [ ] 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	629/411	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,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean	8	3	['callesonne', 'github-actions', 'leanprover-community-mathlib4-bot']	nobody	170-43244 5 months ago	174-31782 5 months ago	9-2320 9 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	170-39441 5 months ago	197-8232 6 months ago	12-48560 12 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	167-79459 5 months ago	167-79459 5 months 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	167-52192 5 months ago	193-40714 6 months ago *	0-0 0 seconds *
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	166-26098 5 months ago	166-26098 5 months 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	166-25852 5 months ago	166-25852 5 months 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	166-4409 5 months ago	166-4409 5 months ago	2-84515 2 days
16428	FR-vdash-bot author:FR-vdash-bot	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 blocked-by-other-PR	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', 'leanprover-community-mathlib4-bot']	nobody	165-67271 5 months ago	165-67271 5 months ago	0-0 0 seconds
17746	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Arithmetic): make `IsNormal` a structure	This allows us to give names to its fields. We also explain the definition better in the docstring. --- TODO: golf `preAleph_le_of_isLimit` [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	32/27	Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	4	1	['github-actions']	nobody	165-60103 5 months ago	165-60103 5 months ago	14-53585 14 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	165-38606 5 months ago	165-38606 5 months 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	165-29360 5 months ago	165-29374 5 months 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	164-64819 5 months ago	283-67005 9 months 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	164-10007 5 months ago	164-10007 5 months 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	164-8910 5 months ago	164-8910 5 months 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	162-83678 5 months ago	162-83678 5 months 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	161-52528 5 months ago	161-52528 5 months ago	0-19926 5 hours
18716	jjaassoonn author:jjaassoonn	feat(Algebra/Module/GradedModule): quotient and subgrading	- [ ] depends on: #9820 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	161-52159 5 months ago	161-52159 5 months 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	160-77580 5 months ago	160-77580 5 months ago	0-1869 31 minutes
18801	JovanGerb author:JovanGerb	Lean pr testing 6019	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	9/16	Mathlib/Data/Fin/Tuple/Take.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/OfFn.lean,lake-manifest.json,lakefile.lean,lean-toolchain	6	3	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	160-33940 5 months ago	160-35377 5 months ago	0-0 0 seconds
9341	winstonyin author:winstonyin	feat: Naturality of integral curves	Let `v` and `v'` be sections of the tangent bundle of manifolds `M` and `M'`, respectively, and let `f : M → M'` be a differentiable map. Then `f` maps integral curves of `v` to integral curves of `v'` if and only if `v` and `v'` are `f`-related. - [x] depends on: #8483 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	158-17951 5 months ago	unknown	unknown
16014	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Principal): even more lemmas on additively principal ordinals	--- These are useful for my work on Cantor normal forms. - [ ] depends on: #15989 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict blocked-by-other-PR	99/60	Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/Principal.lean	2	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	157-75622 5 months ago	157-75622 5 months ago	0-664 11 minutes
7447	BoltonBailey author:BoltonBailey	feat: reverse for fin tuples	The TupleRight section of Data.Fin.Tuple.Basic defines several operations on tuples from the right. This PR redefines these in terms of their from the left counterparts using a new `reverse` function for tuples: ``` cons <-> snoc tail <-> init succ <-> castSucc zero <-> last pred <-> ??? ``` Co-authored-by: Timo Carlin-Burns --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict WIP	112/0	Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Reverse.lean	2	0	[]	nobody	157-40882 5 months ago	157-40883 5 months ago	0-0 0 seconds
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	157-4960 5 months 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	156-66493 5 months ago	156-66493 5 months ago	0-0 0 seconds
18805	FR-vdash-bot author:FR-vdash-bot	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	156-66080 5 months ago	156-66080 5 months 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	155-75753 5 months ago	155-75753 5 months ago	0-0 0 seconds
16116	jjdishere author:jjdishere	feat(Field): add theorems in Stacks Project Chapter 09FA Fields	Add theorems in Stacks Project Chapter 09FA Fields that are not in mathlib. Co-authored-by: --- - [x] depends on: #16105 [![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$	6/2	Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/Field/Subfield.lean	2	6	['github-actions', 'mathlib4-dependent-issues-bot', 'mergify']	nobody	155-52954 5 months ago	157-35362 5 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	154-85507 5 months ago	154-85507 5 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	154-84745 5 months ago	154-84745 5 months ago	1-49655 1 day
18725	joelriou author:joelriou	feat(LinearAlgebra): generators of pi tensor products	--- - [ ] depends on: #18534 [![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$	500/157	Mathlib.lean,Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Analysis/NormedSpace/PiTensorProduct/ProjectiveSeminorm.lean,Mathlib/Data/Sum/Basic.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	13	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	154-84372 5 months ago	154-84372 5 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	154-84370 5 months ago	154-84370 5 months ago	0-602 10 minutes
17458	urkud author:urkud	refactor(Algebra/Group): make `IsUnit` a typeclass	Also change some lemmas to assume `[IsUnit _]` instead of `[Invertible _]`. Motivated by potential non-defeq diamonds in #14986, see also [Zulip](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Invertible.20and.20data) --- [![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$	107/114	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/Definitions.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/Fintype.lean,Mathlib/RingTheory/Localization/NumDen.lean,Mathlib/RingTheory/Polynomial/Content.lean,Mathlib/RingTheory/Polynomial/GaussLemma.lean,Mathlib/RingTheory/Valuation/Basic.lean	27	11	['MichaelStollBayreuth', 'acmepjz', 'eric-wieser', 'github-actions', 'leanprover-bot', 'urkud']	nobody	154-76507 5 months ago	154-76507 5 months ago	0-66650 18 hours
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 - [ ] depends on: #17191 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import 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	154-67923 5 months ago	156-28866 5 months ago	0-0 0 seconds
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	154-41006 5 months ago	154-41006 5 months ago	0-0 0 seconds
18793	JovanGerb author:JovanGerb	Lean pr testing 5948	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	9/16	Mathlib/Data/Fin/Tuple/Take.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/OfFn.lean,lake-manifest.json,lakefile.lean,lean-toolchain	6	6	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	154-23880 5 months ago	160-51805 5 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	153-84441 5 months ago	153-84441 5 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	151-66199 5 months ago	151-66199 5 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	151-61727 5 months ago	444-84200 1 year ago	0-0 0 seconds
18806	FR-vdash-bot author:FR-vdash-bot	refactor: deprecate `MulEquivClass`	--- - [x] depends on: #18809 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	84/72	Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupWithZero/Hom.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/Equiv/Defs.lean,Mathlib/Algebra/Order/Hom/Monoid.lean,Mathlib/Algebra/Prime/Lemmas.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/Combinatorics/Additive/FreimanHom.lean,Mathlib/RingTheory/Bialgebra/Equiv.lean,Mathlib/RingTheory/Ideal/Norm.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/Topology/Algebra/InfiniteSum/Basic.lean	15	6	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	151-52588 5 months ago	151-52588 5 months ago	4-31794 4 days
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	151-43370 5 months ago	151-43370 5 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	150-48381 4 months ago	150-48381 4 months ago	10-33091 10 days
17672	urkud author:urkud	refactor: turn `IsTorsionFree` into a typeclass	Rename `Monoid.IsTorsionFree` to `IsMulTorsionFree` and turn it into a typeclass. Generalize some lemmas from (linear) ordered groups to `IsMulTorsionFree`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	256/130	Mathlib.lean,Mathlib/Algebra/CharZero/Lemmas.lean,Mathlib/Algebra/Group/IsTorsionFree/Basic.lean,Mathlib/Algebra/Group/IsTorsionFree/Defs.lean,Mathlib/Algebra/Group/IsTorsionFree/Instances.lean,Mathlib/Algebra/Module/Defs.lean,Mathlib/Algebra/NoZeroSMulDivisors/Basic.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/ToIntervalMod.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Data/Nat/Prime/Pow.lean,Mathlib/FieldTheory/Finite/GaloisField.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/Order/Min.lean,Mathlib/GroupTheory/Torsion.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/SetTheory/Surreal/Dyadic.lean,Mathlib/Topology/Instances/AddCircle.lean,Mathlib/Topology/Instances/ZMultiples.lean	21	12	['eric-wieser', 'github-actions', 'j-loreaux', 'leanprover-bot', 'urkud']	nobody	150-4665 4 months ago	150-41432 4 months ago	24-67723 24 days
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	149-71723 4 months ago	unknown	unknown
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	149-71723 4 months ago	149-71723 4 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	148-8975 4 months ago	148-8975 4 months ago	0-0 0 seconds
19322	adomani author:adomani	test: rebuild modifying lint	A test to see that #19275 really make CI rebuild every file when the `no_lints` file is modified. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	9/1	lakefile.lean,scripts/no_lints_prime_decls.txt	2	3	['adomani', 'github-actions', 'leanprover-bot']	nobody	147-31477 4 months ago	147-31477 4 months ago	0-0 0 seconds
16361	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPointApproximants): golf + better variable management	We avoid making `f : α →o α` and `x : α` explicit arguments when not needed. We then golf most theorems in the file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	68/101	Mathlib/SetTheory/Ordinal/FixedPointApproximants.lean	1	8	['PhoenixIra', 'YaelDillies', 'github-actions']	nobody	147-4717 4 months ago	147-4717 4 months ago	50-29942 50 days
17624	FR-vdash-bot author:FR-vdash-bot	feat(Algebra/Order/GroupWithZero/Unbundled): generalize lemmas	--- - [ ] depends on: #17623 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	146-22495 4 months ago	146-22495 4 months ago	0-465 7 minutes
16743	agjftucker author:agjftucker	feat(Analysis/Calculus/Implicit): define HasStrictDerivAt.implicitFunOfBivariate	In [this](https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/Implicit.20function.20theorem.20in.20familiar.20form) Zulip thread @Komyyy proved the "familiar" implicit function theorem. Then I wrote a proposal for a Mathlib PR. (Updated) it went: 1. `noncomputable def implicitFunOfBivariate {f : X × Y → Z} {p₀ : X × Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) p₀) : X → Y := ...` 2. `noncomputable def implicitFunOfBivariate' {f : X → Y → Z} {x₀ : X} {y₀ : Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hfx : ContDiffAt 𝕜 1 (f · y₀) x₀) (hfy : ContDiffAt 𝕜 1 (f x₀ ·) y₀) (hfx₀ : fderiv 𝕜 (f · y₀) x₀ = fx) (hfy₀ : fderiv 𝕜 (f x₀ ·) y₀ = fy) : X → Y := ...` 3. `theorem image_eq_iff_implicitFunOfBivariate {f : X × Y → Z} {p₀ : X × Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) p₀) : ∀ᶠ p in 𝓝 p₀, f p = f p₀ ↔ hf₀.implicitFunOfBivariate p.1 = p.2 := ...` 4. `theorem implicitFunOfBivariate_hasStrictFDerivAt {f : X × Y → Z} {x₀ : X} {y₀ : Y} {fx : X →L[𝕜] Z} {fy : Y ≃L[𝕜] Z} (hf₀ : HasStrictFDerivAt f (fx.coprod fy) (x₀, y₀)) : HasStrictFDerivAt hf₀.implicitFunOfBivariate (-fy.symm ∘L fx) x₀ := ...` 5. something on the second derivative (or higher). Although my proposal elicited no response, I am making this micro-PR to address points 1, 3 and 4 since some limited enthusiasm had been shown earlier in that thread (admittedly for another proposal made by another person). I am testing the waters; if this PR gets anywhere I may continue to work on points 2 and 5. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis merge-conflict awaiting-author	132/8	Mathlib/Analysis/Calculus/Implicit.lean,Mathlib/LinearAlgebra/BilinearForm/Orthogonal.lean,Mathlib/LinearAlgebra/Span.lean,Mathlib/Order/Filter/Prod.lean	4	4	['github-actions', 'sgouezel']	sgouezel assignee:sgouezel	144-82002 4 months ago	144-82002 4 months ago	63-71154 63 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/)	new-contributor t-algebra merge-conflict label:t-algebra$	308/0	Mathlib/Order/CompactlyGenerated/Basic.lean,Mathlib/RingTheory/Isotypic.lean,Mathlib/RingTheory/SimpleModule.lean	3	1	['github-actions']	nobody	144-74532 4 months ago	144-74532 4 months ago	20-16585 20 days
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	144-67917 4 months ago	144-67917 4 months ago	4-72589 4 days
17515	FR-vdash-bot author:FR-vdash-bot	perf: do not need `simp low` now	--- - [ ] depends on: #17513 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	144-67916 4 months ago	144-67916 4 months ago	0-380 6 minutes
19299	javierlcontreras author:javierlcontreras	feat(Algebra/CategoryTheory): Add CommAlgebraCat	--- - [x] depends on: #19065 [![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$	26/1	Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Category/AlgebraCat/Basic.lean	2	4	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	144-60537 4 months ago	144-76709 4 months ago	0-2116 35 minutes
19212	Julian author:Julian	feat(LinearAlgebra): add a variable_alias for VectorSpace	Taken directly from the variable_alias docs. Zulip: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/why.20.5Bvariable_alias.5D.20attribute.20is.20not.20used.20in.20Mathlib.3F --- This is the first actual variable alias added to mathlib. I haven't reviewed variable_alias fully, but it seems like there's at least 3 ways they could be distributed in Mathlib: * alongside whatever subfolder they "belong to" (which is what I've tentatively done here) * In a file called `Aliases` somewhere near the thing they alias (which seems less discoverable to me) * In a single file, a la `Mathlib.TrainingWheels` (with some less playful name) which is meant to define a bunch of more "friendly" aliases all in one place. I kind of like the idea of the third thing as a future module but perhaps it can be synthesized if/when there are more aliases? For now as I say I've done the first one, but please let me know if someone prefers something else. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	143-73162 4 months ago	143-73162 4 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	141-49239 4 months ago	141-49239 4 months ago	4-60621 4 days
16210	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	140-56380 4 months ago	228-45461 7 months ago	0-0 0 seconds
16956	Parcly-Taxel author:Parcly-Taxel	refactor(Order/Interval/Finset/Nat): supersymmetrise API	As implored by @b-mehta.	t-order merge-conflict awaiting-author	93/48	Mathlib/Algebra/BigOperators/Intervals.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/MeasureTheory/Decomposition/UnsignedHahn.lean,Mathlib/NumberTheory/Divisors.lean,Mathlib/Order/Interval/Finset/Nat.lean,Mathlib/Topology/EMetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Pseudo/Basic.lean	7	7	['YaelDillies', 'b-mehta', 'github-actions', 'vihdzp']	nobody	140-55926 4 months ago	197-13652 6 months ago	0-61758 17 hours
9598	AlexKontorovich author:AlexKontorovich	feat(Analysis/Complex): HasPrimitives on disc	We prove that holomorphic functions on discs have primitives. TODO: Extend to holomorphic functions on simply connected domains, and use this to define general complex logarithms. Co-authored by: Ian Jauslin ian.jauslin@rutgers.edu --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	563/10	Mathlib.lean,Mathlib/Analysis/Asymptotics/Asymptotics.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/HasPrimitives.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Order/Interval/Set/UnorderedInterval.lean	6	48	['AlexKontorovich', 'github-actions', 'grunweg', 'loefflerd', 'sgouezel', 'urkud', 'vbeffara']	urkud assignee:urkud	140-36142 4 months ago	140-36142 4 months ago	100-57565 100 days
19526	metakunt author:metakunt	feat:closure properties of numbers that are introspective to polynomials	Prove Part 1 of Claim 1.(i) of Theorem 6.1 in https://www3.nd.edu/~andyp/notes/AKS.pdf. ---- Zulip discussion: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Aks.20primality.20Theorem.206.2E1.20Claim.20.28i.29.20proven	new-contributor t-number-theory merge-conflict awaiting-author	57/0	Mathlib.lean,Mathlib/NumberTheory/AKSPrimality.lean	2	10	['Ruben-VandeVelde', 'github-actions', 'jcommelin', 'kim-em', 'metakunt']	nobody	138-75865 4 months ago	138-75865 4 months ago	0-16072 4 hours
19414	vihdzp author:vihdzp	feat: Nesbitt's inequality	We prove [Nesbitt's inequality](https://en.wikipedia.org/wiki/Nesbitt%27s_inequality) `3 / 2 ≤ a / (b + c) + b / (c + a) + c / (b + a)` for a linearly ordered semifield, by reduction to the AM-HM inequality. --- - [ ] depends on: #19415 - [ ] depends on: #19420 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra merge-conflict awaiting-author blocked-by-other-PR WIP label:t-algebra$	192/142	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/Field/Defs.lean,Mathlib/Analysis/MeanInequalities.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Fin/Tuple/Reflection.lean,Mathlib/Data/Fintype/BigOperators.lean	10	8	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	138-18240 4 months ago	138-18240 4 months ago	0-481 8 minutes
19420	vihdzp author:vihdzp	feat: AM-HM inequality	We prove the weighted and unweighted AM-HM inequalities in linearly ordered semifields. --- [![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$	36/2	Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Analysis/MeanInequalities.lean	2	7	['YaelDillies', 'github-actions', 'vihdzp']	nobody	138-18239 4 months ago	138-18239 4 months ago	0-46682 12 hours
19415	vihdzp author:vihdzp	chore: move results on `Σ i : Fin n, f i` earlier	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-CI merge-conflict	131/145	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/BigOperators/Finsupp.lean,Mathlib/Algebra/MvPolynomial/Equiv.lean,Mathlib/Algebra/Order/Antidiag/Pi.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/AlgebraicTopology/AlternatingFaceMapComplex.lean,Mathlib/Combinatorics/Enumerative/Catalan.lean,Mathlib/Combinatorics/Optimization/ValuedCSP.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Fin/Tuple/Reflection.lean,Mathlib/Data/Fintype/BigOperators.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/LinearAlgebra/LinearIndependent.lean	13	2	['YaelDillies', 'github-actions']	nobody	137-84053 4 months ago	137-84053 4 months ago	0-0 0 seconds
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	137-76586 4 months ago	246-75776 8 months ago	0-0 0 seconds
18662	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): generators of the exterior powers	--- - [ ] depends on: #18534 - [x] depends on: #18590 - [ ] depends on: #18725 [![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	135-42500 4 months ago	154-84373 5 months ago	0-0 0 seconds
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	45	['Ruben-VandeVelde', 'YaelDillies', 'bustercopley', 'eric-wieser', 'github-actions', 'joelriou', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball', 'smorel394']	eric-wieser assignee:eric-wieser	135-27759 4 months ago	135-42086 4 months ago	22-67320 22 days
14501	jjaassoonn author:jjaassoonn	feat: module structure of filtered colimit of abelian groups over filtered colimit of rings	This helps defining the module structure of stalks This contribution was inspired by the AIM workshop "Formalizing algebraic geometry" in June 2024. --- - [x] depends on: #15315 [I am going to move the result in the new file] [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	134-80244 4 months ago	134-80244 4 months ago	64-29952 64 days
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/)	merge-conflict	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	134-79126 4 months ago	134-79126 4 months ago	8-56155 8 days
16344	robertmaxton42 author:robertmaxton42	feat(LinearAlgebra/FreeProduct): add induction principle, further simp opts for lift	Add an induction principle for proving properties about a `FreeProduct`. Replaces a number of `simp` and `aesop` calls in `lift` with `simp_rw` scripts to reduce compilation time (thanks Kevin!). - [ ] depends on: #15686 --- In a couple of places, I have used `simp↓` attributes when the linter tells me that a `simp` lemma is not in simp-normal form, instead of changing the LHS as the linter recommends. I claim that this is a legitimate use to tag important foundational lemmas that should be kept in a convenient human-readable form, but also contain nontrivial components that `simp` cannot already handle completely. Please tell me your thoughts. [![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$	240/17	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	131-59381 4 months ago	131-59381 4 months ago	0-479 7 minutes
19547	grunweg author:grunweg	perf: merge several style syntax linters	Does this improve performance? To be determined! --- Opening just for benchmarking purposes. Would need clean-up before it can be merged. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	awaiting-bench t-linter merge-conflict WIP	104/25	Mathlib/Tactic/Linter/Style.lean,MathlibTest/LintStyle.lean	2	7	['adomani', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	131-58765 4 months ago	131-58765 4 months ago	0-0 0 seconds
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. --- - [ ] depends on: #19091 - [x] depends on: #19095 [![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$	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	130-27342 4 months ago	139-47216 4 months ago	0-0 0 seconds
18756	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'leanprover-bot']	nobody	130-14908 4 months ago	130-14908 4 months ago	31-75259 31 days
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 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	130-10990 4 months ago	130-10990 4 months ago	0-0 0 seconds
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	130-4809 4 months ago	130-4809 4 months ago	20-56416 20 days
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	129-70085 4 months ago	139-47215 4 months ago	0-0 0 seconds
18912	b-mehta author:b-mehta	feat(SpecialFunctions/Log): more continuity and limits for logb	Continuation from #18621. From the ExponentialRamsey project. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	144/17	Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Data/Set/Pointwise/Interval.lean,Mathlib/Topology/Algebra/Order/Field.lean	3	9	['b-mehta', 'dupuisf', 'github-actions', 'j-loreaux']	nobody	129-59422 4 months ago	129-59422 4 months ago	1-18352 1 day
12561	BoltonBailey author:BoltonBailey	doc: Elaborate output of `lake exe pole`	- [x] Explain what to do if the benchmarks haven't been run - [ ] Put (millions) in the chart where appropriate - [ ] Elaborate the CLI help message --- - [x] depends on: #12322 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	1/1	LongestPole/Main.lean	1	1	['leanprover-community-mathlib4-bot']	nobody	129-27255 4 months ago	unknown	unknown
16391	vihdzp author:vihdzp	feat(SetTheory/Ordinal/NaturalOps): characterization of natural operations in base `ω`	This essentially gives us a characterization of natural addition and multiplication in terms of the base `ω` Cantor normal form. --- - [ ] depends on: #15989 - [ ] depends on: #15991 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	362/68	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/NaturalOps.lean,Mathlib/SetTheory/Ordinal/Principal.lean	5	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	127-56294 4 months ago	218-74271 7 months ago	0-106 1 minute
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	127-27377 4 months ago	133-62800 4 months ago	0-4534 1 hour
19046	j-loreaux author:j-loreaux	feat: define class `SemigroupAction`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	34/25	Mathlib/Algebra/Category/ModuleCat/Presheaf.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Pushforward.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/Polynomial/Laurent.lean,Mathlib/Analysis/Distribution/SchwartzSpace.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/LinearAlgebra/FreeModule/IdealQuotient.lean,Mathlib/LinearAlgebra/Matrix/SesquilinearForm.lean	11	7	['alreadydone', 'github-actions', 'j-loreaux', 'leanprover-bot', 'urkud']	nobody	126-62792 4 months ago	126-62793 4 months ago	6-21105 6 days
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	125-74703 4 months ago	125-74703 4 months ago	3-30853 3 days
17027	vihdzp author:vihdzp	feat(SetTheory/ZFC/Ordinal): von Neumann hierarchy of sets	--- - [x] depends on: #16996 - [x] depends on: #17016 - [x] depends on: #17026 - [x] depends on: #18239 - [ ] depends on: #19946 - [x] depends on: #19967 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict blocked-by-other-PR	204/29	Mathlib.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Neumann.lean,Mathlib/SetTheory/ZFC/Rank.lean	5	8	['alreadydone', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	124-36788 4 months ago	125-27191 4 months ago	0-344 5 minutes
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	123-65321 4 months ago	123-65324 4 months ago	0-989 16 minutes
8686	j-loreaux author:j-loreaux	refactor: allow non-unital `AlgEquiv`	This refactors `AlgEquiv` (and `AlgEquivClass`) to incorporate a `map_smul` field instead of `commutes`. This allows us to weaken the type class assumptions on `AlgEquiv` 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] ``` in accordance with the other `Equiv` structures (e.g., `MulEquiv`, `AddEquiv`, `RingEquiv`). This allows us to use `AlgEquiv` for both unital and non-unital (even non-associative) algebra homomorphisms. Note in addition that `StarAlgEquiv` already follows this paradigm. We supply the convenience constructor `AlgEquiv.ofCommutes`, which is marked `inline` and `reducible`, so that users can still provide go via the `commutes` route for constructing and `AlgEquiv` whenever it is more convenient. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	286/227	Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Opposite.lean,Mathlib/Algebra/Algebra/Pi.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Algebra/Tower.lean,Mathlib/Algebra/Category/AlgebraCat/Basic.lean,Mathlib/Algebra/DualQuaternion.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Star/Free.lean,Mathlib/Algebra/Star/StarAlgHom.lean,Mathlib/Analysis/NormedSpace/LpEquiv.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/IsROrC/Basic.lean,Mathlib/Data/Matrix/Basic.lean,Mathlib/Data/Matrix/DualNumber.lean,Mathlib/Data/MvPolynomial/Equiv.lean,Mathlib/Data/MvPolynomial/Rename.lean,Mathlib/Data/Polynomial/AlgebraMap.lean,Mathlib/LinearAlgebra/Matrix/Basis.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Coeff.lean,Mathlib/LinearAlgebra/Matrix/Reindex.lean,Mathlib/LinearAlgebra/Matrix/ToLin.lean,Mathlib/LinearAlgebra/TensorProduct/Opposite.lean,Mathlib/Logic/Equiv/TransferInstance.lean,Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/GradedAlgebra/Basic.lean,Mathlib/RingTheory/Ideal/QuotientOperations.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/MatrixAlgebra.lean,Mathlib/RingTheory/Polynomial/Quotient.lean,Mathlib/RingTheory/PolynomialAlgebra.lean,Mathlib/RingTheory/TensorProduct.lean,Mathlib/Topology/LocallyConstant/Algebra.lean	35	2	['eric-wieser', 'j-loreaux']	nobody	120-77116 3 months ago	500-39893 1 year ago	0-0 0 seconds
18508	urkud author:urkud	chore(OperatorNorm/Completeness): drop a duplicate instance	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict help-wanted	5/22	Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/InnerProductSpace/LinearPMap.lean,Mathlib/Analysis/Normed/Operator/BoundedLinearMaps.lean,Mathlib/Analysis/NormedSpace/HahnBanach/SeparatingDual.lean,Mathlib/Analysis/NormedSpace/OperatorNorm/Completeness.lean,Mathlib/MeasureTheory/Integral/SetToL1.lean,Mathlib/Topology/Algebra/Module/StrongTopology.lean	7	15	['github-actions', 'j-loreaux', 'leanprover-bot', 'urkud']	nobody	120-40510 3 months ago	120-40511 3 months ago	0-46295 12 hours
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	119-84523 3 months ago	119-84523 3 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	119-84522 3 months ago	119-84522 3 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	119-66783 3 months ago	119-66783 3 months ago	0-666 11 minutes
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: #18725 - [ ] 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	119-58097 3 months ago	154-84371 5 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: #18725 - [ ] 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	119-58088 3 months ago	unknown	unknown
18527	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`. --- - [x] depends on: #18408 - [ ] depends on: #18432 - [ ] depends on: #18725 [![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$	858/157	Mathlib.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/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	119-58086 3 months ago	154-84497 5 months ago	0-0 0 seconds
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	119-58078 3 months ago	155-38143 5 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	114-65715 3 months ago	114-65716 3 months ago	0-0 0 seconds
19699	vihdzp author:vihdzp	chore(SetTheory/Cardinal/Basic): tweak `#α = 0`, `#α = 1`, etc. lemmas	We rename `le_one_iff_subsingleton` → `mk_le_one_iff` and `mk_le_one_iff_set_subsingleton` → `mk_set_le_one_iff` to match the names of other lemmas in this section. We also add `mk_eq_one_iff` and `mk_set_eq_one_iff`. --- These last two lemmas can probably be golfed somehow. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-CI merge-conflict	48/16	Mathlib/SetTheory/Cardinal/Basic.lean	1	1	['github-actions']	nobody	112-71149 3 months ago	112-71149 3 months ago	0-5976 1 hour
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	109-66208 3 months ago	154-81836 5 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	106-39012 3 months ago	106-39012 3 months ago	0-3440 57 minutes
15773	kkytola author:kkytola	feat: Add type class for ENat-valued floor functions	This PR adds a type class for extended natural number -valued floor functions. This is split off from #15269, where the suggestions were to make the floor function on ENNReal ENat-valued and to have an API mimicling FloorSemirings. Besides ENNReal, at least ENNRat would naturally satisfy the general type class. --- Two things are worth noting: * To fully mimic `FloorSemiring` API, also ceiling functions need to be added. The plan is to do that in a later PR. * The PR introduces the class `CastNatENatClass` to ensure that `natCast` and a coercion from `ENat` behave in the natural and order-respecing manner. This feels a little ad hoc, but such assumptions are needed for general `ENat`-valued floor functions to behave well. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	106-38889 3 months ago	106-38889 3 months ago	66-24436 66 days
17069	yuma-mizuno author:yuma-mizuno	chore(CategoryTheory/Functor/Basic): put `simp` at `Functor.id_comp`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	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	105-71756 3 months ago	105-71756 3 months ago	0-0 0 seconds
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	104-13542 3 months ago	104-13542 3 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	104-13541 3 months ago	104-13541 3 months ago	0-0 0 seconds
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	102-31082 3 months ago	102-31082 3 months ago	135-29017 135 days
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	12	['Command-Master', 'PatrickMassot', 'eric-wieser', 'github-actions', 'grhkm21', 'grunweg', 'kbuzzard', 'kim-em']	nobody	101-84771 3 months ago	101-84772 3 months ago	0-8789 2 hours
19985	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. --- - [ ] depends on: #19946 - [x] depends on: #19970 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-set-theory merge-conflict blocked-by-other-PR	208/6	Mathlib/Order/SuccPred/CompleteLinearOrder.lean,Mathlib/SetTheory/ZFC/Basic.lean,Mathlib/SetTheory/ZFC/Ordinal.lean,Mathlib/SetTheory/ZFC/Rank.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	101-75063 3 months ago	101-75063 3 months ago	0-562 9 minutes
20201	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/)	merge-conflict WIP	148/0	Mathlib.lean,Mathlib/AlgebraicTopology/Anodyne.lean,Mathlib/AlgebraicTopology/KanFibration.lean,Mathlib/CategoryTheory/MorphismProperty/WeakSaturation.lean	4	1	['github-actions']	nobody	97-64185 3 months ago	97-64185 3 months ago	0-0 0 seconds
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	97-53429 3 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	95-65887 3 months ago	142-74024 4 months ago	0-200 3 minutes
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	985/8	Mathlib.lean,Mathlib/CategoryTheory/Sites/Continuous.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/Basic.lean,Mathlib/CategoryTheory/Sites/DenseSubsite/OneHypercoverDense.lean,Mathlib/CategoryTheory/Sites/OneHypercover.lean,Mathlib/CategoryTheory/Sites/Sieves.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	95-65073 3 months ago	106-69644 3 months ago	0-0 0 seconds
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	95-62114 3 months ago	95-62114 3 months ago	6-66637 6 days
18771	joelriou author:joelriou	feat(LinearAlgebra/ExteriorPower): exterior powers of free modules are free	Co-authored-by: sophie.morel@ens-lyon.fr --- - [ ] depends on: #18662 - [ ] depends on: #18534 - [ ] 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	93-60540 3 months ago	154-84369 5 months ago	0-0 0 seconds
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 merge-conflict please-adopt label:t-algebra$	243/3	Mathlib.lean,Mathlib/LinearAlgebra/DirectSum/Finsupp.lean,Mathlib/LinearAlgebra/DirectSum/PiTensorProduct.lean,Mathlib/LinearAlgebra/Multilinear/DirectSum.lean	4	31	['Ruben-VandeVelde', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot', 'smorel394']	nobody	93-58637 3 months ago	93-58637 3 months ago	6-23591 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	93-49389 3 months ago	93-49389 3 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	93-49144 3 months ago	93-49144 3 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	92-84078 3 months ago	92-84078 3 months ago	0-0 0 seconds
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/)	large-import t-algebra merge-conflict awaiting-author label:t-algebra$	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	92-73913 3 months ago	92-73913 3 months ago	8-2214 8 days
19091	Vierkantor author:Vierkantor	chore(Algebra/MonoidAlgebra): split Defs.lean further	This PR further splits the big file `MonoidAlgebra/Defs.lean` to focus on the ring structure on (`Add`)`MonoidAlgebra`. The following files have been split off: * `MonoidAlgebra/Lift.lean`: definition of `liftNC` * `MonoidAlgebra/MapDomain.lean`: definition of `mapDomain` * `MonoidAlgebra/Module.lean`: module structure (and some submodule results) * `MonoidAlgebra/Opposite.lean`: results on the `MulOpposite` ring structure I also changed one proof about scalar multiplication by natural numbers, so that it wouldn't need a full on module structure on `Finsupp`. This required adding a pair of lemmas on the definition of multiplying `Finsupp`s by natural numbers. --- - [ ] depends on: #19087 - [ ] depends on: #19205 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	883/560	Mathlib.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/Data/Finsupp/Defs.lean,Mathlib/RingTheory/Polynomial/Opposites.lean	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	92-70661 3 months ago	92-70661 3 months ago	2-72196 2 days
15720	znssong author:znssong	feat(SimpleGraph): The Bondy-Chvátal theorem	The proof of the Bondy-Chvátal theorem, with Dirac's theorem and Ore's theorem as its corollary. - [x] depends on: #15536 - [ ] depends on: #15711 - [ ] depends on: #15578	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	92-68475 3 months ago	92-68475 3 months ago	0-1791 29 minutes
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	92-68475 3 months ago	92-68475 3 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	92-34394 3 months ago	92-34394 3 months ago	33-11262 33 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-algebra merge-conflict awaiting-author label:t-algebra$	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	91-76766 3 months ago	91-76766 3 months ago	13-7138 13 days
14412	jjaassoonn author:jjaassoonn	feat: show stalk of presheaf of modules is a module over stalk of ring	--- - [x] depends on: #14413 - [ ] depends on: #14501 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	90-52977 3 months ago	246-76597 8 months ago	0-0 0 seconds
8362	urkud author:urkud	feat(Asymptotics): define `ReflectsGrowth`	--- - [x] depends on: #8349 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	90-41648 3 months ago	90-41648 3 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	90-26244 3 months ago	90-26244 3 months ago	117-22351 117 days
10129	linesthatinterlace author:linesthatinterlace	fix(Topology/MetricSpace/InfSep): Make `infsep` consistent with `diam`, `infdist`	Redefine `Set.infesep` and `Set.infsep` to be `EMetric.infsep` and `Metric.infsep` --- When I created `infsep` two years ago, I think it was an error to overuse dot notation in the way that I did, because it just makes it inconsistent with other, similar constructions elsewhere like `Metric.diam`, etc. As such, this refactor removes the dot notation of the original file, and makes some other smaller improvements as part of streamlining the file, such as removing `[Finite s]` lemmas and keeping only `s.Finite` lemmas. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict awaiting-author	292/361	Mathlib/Topology/MetricSpace/Infsep.lean	1	9	['YaelDillies', 'fpvandoorn', 'linesthatinterlace']	nobody	88-52526 2 months ago	378-75566 1 year ago	0-0 0 seconds
13539	joelriou author:joelriou	feat: the bicategory of adjunctions in a bicategory	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-category-theory merge-conflict please-adopt WIP	182/0	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Adj.lean	2	1	['riccardobrasca']	nobody	88-8119 2 months ago	88-8119 2 months ago	0-0 0 seconds
18285	callesonne author:callesonne	feat(Bicategory/Grothendieck): functoriality of the grothendieck construction	This PR is the start towards proving functoriality of the Grothendieck construction. --- - [ ] depends on: #18252 - [ ] depends on: #18253 [![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	467/301	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Functor/Pseudofunctor.lean,Mathlib/CategoryTheory/Bicategory/Grothendieck.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean,Mathlib/CategoryTheory/Category/Cat.lean,scripts/noshake.json	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	88-7180 2 months ago	88-7180 2 months ago	0-0 0 seconds
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	87-56053 2 months ago	87-56054 2 months ago	36-2255 36 days
17781	robin-carlier author:robin-carlier	feat(CategoryTheory/Limits/Sifted): characterization of sifted categories	Characterize small sifted as those for which the `Type`-valued colimit functor preserves finite product. Deduce that filtered categories, and that categories admitting a final functor from a sifted categories are also sifted. --- Second part of what used to be #17554. The core of the proof relies on a few private lemmas/defs (`colimBoxIsoColimTensColim` and `factorization_prod_comparison_colim` being the most important ones) and I don’t know if that can be avoided. I am still unsure wether or not the part relating sifted categories to filtered categories should be split off in a different file to avoid importing `CategoryTheory/Limits/FilteredColimitCommutesFiniteLimit.lean` every time `CategoryTheory/Limits/Sifted.lean` is imported. The fact that filtered categories are sifted can also be proved without the characterization in this PR (it reduces essentially to `IsFiltered.bowtie`), and so it could also stay in this file with less imports, but I find it nicer to do it using the characterization. - [x] depends on: #17766 - [x] depends on: #17779 [![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	232/2	Mathlib/CategoryTheory/Limits/Sifted.lean	1	9	['github-actions', 'joelriou', 'mathlib4-dependent-issues-bot']	nobody	87-38042 2 months ago	87-38042 2 months ago	33-9317 33 days
20160	vasnesterov author:vasnesterov	feat(Data/Seq): `modify` and `set` operations for `Seq`	Introduce `modify` and `set` operations for sequences, along with a few lemmas about them. --- - [ ] depends on: #20071 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR	801/416	Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	86-74267 2 months ago	86-74267 2 months ago	0-170 2 minutes
19120	hrmacbeth author:hrmacbeth	feat: stop `ring`/`abel` from seeing algebraic operations inside `let`s	This draft PR illustrates a feature I would like to see in core: a variant of `whnf` which allows particular kinds of reduction, such as zeta-delta reduction, to be turned off. Here it is used to make ring-normalization and abelian-group-normalization a bit more responsive to what (I think) users expect: these normalizations would no longer look inside user-defined lets to see algebraic operations in those expressions. Note: In Lean/Mathlib 3, `ring` matched for algebraic operations on an algebraic expression `e` itself, not on `← whnfR e`. So mathlib3 `ring` didn't see algebraic operations inside `let`s -- but it also didn't see algebraic operations requiring beta-reduction (like `(fun t ↦ t + 1) x`) or see inside abbreviations. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/239415-metaprogramming-.2F-tactics/topic/whnf.20variant.20which.20preserves.20let-bindings) Update: fortuitously, it looks like the new core PR https://github.com/leanprover/lean4/pull/6053 will provide this feature! --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict blocked-by-core-PR	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	86-52656 2 months ago	149-9338 4 months ago	0-0 0 seconds
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	85-85264 2 months ago	85-85264 2 months ago	0-8636 2 hours
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	13	['FR-vdash-bot', 'YaelDillies', 'eric-wieser', 'github-actions', 'leanprover-community-mathlib4-bot', 'urkud']	nobody	85-84924 2 months ago	285-68801 9 months ago	4-46495 4 days
20477	artie2000 author:artie2000	feat(Aesop): Improve SetLike ruleset	* Make many safe Aesop rules in the SetLike ruleset either unsafe or (additionally) simp lemmas * Add new Aesop rules `.closure_mem_of_mem` and `mem_of_star_mem` * Replace `simps` auto-generated lemmas around `StarAlgebra.adjoin` with an Aesop-registered API * Add new library note [SetLike Aesop ruleset] explaining the principles behind the new design The `simps` auto-generated lemmas I have removed produced messy output that harmed the performance of simp and Aesop without being particularly usable. The new API brings `StarAlgebra.adjoin` and friends in line with anlogous operations elsewhere in Mathlib. Moves (incidental): `NonUnitalSubalgebra.starClosure_toNonunitalSubalgebra` -> `NonUnitalSubalgebra.starClosure_toNonUnitalSubalgebra` --- [![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$	201/85	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/Ring/Cone.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Polynomial/Module/AEval.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/MeasureTheory/Function/StronglyMeasurable/Basic.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/EssentialFiniteness.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Basic.lean,Mathlib/Tactic/SetLike.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/NonUnitalAlgebra.lean,Mathlib/Topology/Algebra/NonUnitalStarAlgebra.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean	50	62	['JLimperg', 'YaelDillies', 'artie2000', 'github-actions', 'leanprover-bot', 'madvorak']	nobody	83-78434 2 months ago	83-78434 2 months ago	14-64862 14 days
20836	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/)	merge-conflict	354/175	Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Data/SetLike/Basic.lean,Mathlib/Data/SetLike/Closure.lean,Mathlib/Order/CompleteLattice.lean	5	2	['artie2000', 'github-actions']	nobody	81-62238 2 months ago	81-62238 2 months ago	0-0 0 seconds
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	80-73401 2 months ago	80-73401 2 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	79-47834 2 months ago	79-47834 2 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	79-41864 2 months ago	79-41864 2 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	78-63994 2 months ago	513-37281 1 year ago	4-7271 4 days
3171	eric-wieser author:eric-wieser	refactor: make the algebra hierarchy use flat structures	By introducing a `FlatHack` base class and using it as the first parent of every algebra typeclass, it causes the typeclasses to all overlap and so we emulate flat structures. Most of the pain here comes from `to_additive` not generating any of the ancestor projections properly; this was already a bug present for `n + 1` parents, but now the `1` is taken up This is one workaround for leanprover/lean4#2074: don't let the eta-diamonds appear in the first place. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	328/240	.github/workflows/build.yml,Mathlib/Algebra/Algebra/Equiv.lean,Mathlib/Algebra/Algebra/Hom.lean,Mathlib/Algebra/Category/GroupCat/Basic.lean,Mathlib/Algebra/Category/GroupCat/EquivalenceGroupAddGroup.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Field/Defs.lean,Mathlib/Algebra/GCDMonoid/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Ext.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/Algebra/GroupPower/Lemmas.lean,Mathlib/Algebra/Hom/Group.lean,Mathlib/Algebra/MonoidAlgebra/Basic.lean,Mathlib/Algebra/Order/Chebyshev.lean,Mathlib/Algebra/Order/Group/Abs.lean,Mathlib/Algebra/Order/Group/Defs.lean,Mathlib/Algebra/Order/Module.lean,Mathlib/Algebra/Order/Rearrangement.lean,Mathlib/Algebra/Order/Ring/Canonical.lean,Mathlib/Algebra/Order/Ring/Defs.lean,Mathlib/Algebra/Quandle.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/TrivSqZeroExt.lean,Mathlib/CategoryTheory/Endomorphism.lean,Mathlib/CategoryTheory/Preadditive/Basic.lean,Mathlib/CategoryTheory/Preadditive/SingleObj.lean,Mathlib/Data/Finsupp/Multiset.lean,Mathlib/Data/Int/LeastGreatest.lean,Mathlib/Data/Int/Order/Basic.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Nat/Choose/Multinomial.lean,Mathlib/Data/Real/CauSeqCompletion.lean,Mathlib/Data/ZMod/Defs.lean,Mathlib/LinearAlgebra/AffineSpace/Ordered.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/RingTheory/Ideal/Quotient.lean,Mathlib/Tactic/Positivity/Core.lean,Mathlib/Tactic/Ring/Basic.lean	42	14	['eric-wieser', 'gebner', 'harahu']	nobody	78-63979 2 months ago	626-72187 1 year ago	0-0 0 seconds
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	78-41499 2 months ago	78-41499 2 months ago	101-64856 101 days
12670	trivial1711 author:trivial1711	feat: completion of a nonarchimedean multiplicative group	We prove that the completion of a nonarchimedean multiplicative group is a nonarchimedean multiplicative group. --- - [x] depends on: #12669 - [ ] depends on: #11837 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	78-41376 2 months ago	unknown	unknown
14799	luigi-massacci author:luigi-massacci	feat(Analysis/MeanInequalities): Weighted QM-AM inequality	The inequality between the quadratic and arithmetic mean as a consequence of Jensen's inequality. Weighted version for positive real valued functions from a `Finset`. Fix notation for sums, switching to `∈` in place of `in`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-analysis easy merge-conflict awaiting-author	26/3	Mathlib/Analysis/MeanInequalities.lean	1	8	['YaelDillies', 'acmepjz', 'github-actions', 'luigi-massacci', 'vihdzp']	nobody	78-41005 2 months ago	78-41005 2 months ago	0-38862 10 hours
12294	AntoineChambert-Loir author:AntoineChambert-Loir	feat(Mathlib.RingTheory.TensorProduct.Polynomial) : tensor product of a (univariate) polynomial ring	We define a linear equivalence of a polynomial ring by a module with a finsupp type. We prove lemmas that allow to manipulate this equivalence. This is adapted from the content of #12293, but since `Polynomial` is a structure containing a `Finsupp`, these functions can't be applied directly to `Polynomial`. Some linear equivs need to be added to mathlib for that. --- - [x] depends on: #12293 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	484/0	Mathlib.lean,Mathlib/Algebra/MvPolynomial/Basic.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Data/Finsupp/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/RingTheory/TensorProduct/MvPolynomial.lean,Mathlib/RingTheory/TensorProduct/Polynomial.lean	7	1	['leanprover-community-mathlib4-bot']	nobody	77-73724 2 months ago	77-73724 2 months ago	0-79429 22 hours
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 merge-conflict WIP	657/1	Mathlib.lean,Mathlib/Data/Finsupp/Lex.lean,Mathlib/Data/Finsupp/MonomialOrder.lean,Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean,Mathlib/Data/Finsupp/MonomialOrder/DegRevLex.lean,Mathlib/Data/Finsupp/Weight.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	77-73585 2 months ago	77-73585 2 months ago	0-1720 28 minutes
18438	ADedecker author:ADedecker	refactor: adapt `KrullTopology` to the new algebraic filter bases API	--- - [ ] 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 blocked-by-other-PR 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	77-44357 2 months ago	77-44357 2 months ago	0-638 10 minutes
12824	BoltonBailey author:BoltonBailey	refactor: `ReflTransGen`	It would be nice to have that `ReflTransGen` is the composition of `ReflGen` with `TransGen`, currently experimenting with redefining it this way. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict WIP help-wanted	91/96	Mathlib/Logic/Relation.lean	1	4	['BoltonBailey', 'grunweg', 'vihdzp']	nobody	77-26152 2 months ago	79-39251 2 months ago	0-0 0 seconds
19890	vihdzp author:vihdzp	chore(SetTheory/Ordinal/Arithmetic): redefine subtraction	We redefine ordinal subtraction so as to make `add_sub_cancel_of_le` an immediate corollary. This ultimately allows us to give a much simpler proof for `add_le_of_limit` (now `add_le_iff_of_isLimit`). --- - [ ] depends on: #18893 - [x] depends on: #19888 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict blocked-by-other-PR	134/94	Mathlib/Order/InitialSeg.lean,Mathlib/Order/RelIso/Basic.lean,Mathlib/Order/RelIso/Set.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	76-80992 2 months ago	76-80992 2 months ago	0-155 2 minutes
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	74-1925 2 months ago	74-1925 2 months ago	0-201 3 minutes
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 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	1	['fpvandoorn']	nobody	73-56222 2 months ago	73-61199 2 months ago	0-0 0 seconds
9449	hmonroe author:hmonroe	feat: Add Turing machine with the quintet definition (TMQ) and a chainable step function for each TM type	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	458/1	Mathlib/Computability/TuringMachine.lean,Mathlib/Logic/PartArith.lean	2	8	['eric-wieser', 'github-actions', 'hmonroe']	nobody	73-6178 2 months ago	73-6178 2 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	71-67395 2 months ago	71-67395 2 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/)	merge-conflict	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	70-76881 2 months ago	70-76881 2 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	70-59843 2 months ago	70-59843 2 months ago	0-0 0 seconds
20270	Bergschaf author:Bergschaf	feat(Order/Subframe): Definition of a Subframe as a CompleteSublattice of a Frame	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order RFC merge-conflict WIP	19/0	Mathlib.lean,Mathlib/Order/Subframe.lean	2	2	['Bergschaf', 'github-actions']	nobody	70-56358 2 months ago	70-56358 2 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/)	large-import t-algebra merge-conflict label:t-algebra$	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	70-53889 2 months ago	70-53889 2 months ago	2-7106 2 days
19697	quangvdao author:quangvdao	feat(BigOperators/Fin): Sum/product over `Fin` intervals	This PR adds new theorems about the sum/product of some vector over `Fin` intervals. One example is: ``` @[to_additive] theorem prod_Iic_succ (i : Fin n) : ∏ j ∈ Iic i.succ, v j = (∏ j ∈ Iic i.castSucc, v j) * v i.succ ``` --- - [x] depends on: #20360 This is in preparation for reworking `finSigmaFinEquiv` and `finProdFinEquiv` in #19013. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	70-48596 2 months ago	70-48596 2 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	69-47717 2 months ago	69-47717 2 months ago	0-7781 2 hours
21196	vihdzp author:vihdzp	chore: make argument of `zero_le` implicit	This simplifies our expressions probably 95% of the time, and the remaining 5% we can simply use the Lean 4 implicit argument notation. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-order awaiting-CI merge-conflict	10/10	Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean	1	1	['github-actions']	nobody	69-23839 2 months ago	69-23839 2 months ago	0-0 0 seconds
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	68-30711 2 months ago	68-30711 2 months ago	39-21495 39 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']	nobody	67-67387 2 months ago	unknown	unknown
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	67-66602 2 months ago	68-54965 2 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	67-66601 2 months ago	68-54921 2 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	67-66600 2 months ago	68-54802 2 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	67-42128 2 months ago	67-42128 2 months ago	17-44773 17 days
20431	erdOne author:erdOne	feat(RingTheory/AdicCompletion): monotonicity of adic-completeness	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict awaiting-author label:t-algebra$	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	67-39613 2 months ago	67-39613 2 months ago	35-86379 35 days
18441	ADedecker author:ADedecker	refactor(AdicTopology): use new API for algebraic filter bases, and factor some code	--- - [ ] 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 blocked-by-other-PR 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	66-11958 2 months ago	66-11959 2 months ago	0-679 11 minutes
20030	vihdzp author:vihdzp	refactor: avoid ordinals in Nöbeling's theorem	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict WIP help-wanted	356/428	Mathlib/Topology/Category/Profinite/Nobeling.lean	1	1	['github-actions']	nobody	66-11713 2 months ago	66-11713 2 months ago	0-0 0 seconds
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	65-58638 2 months ago	65-58638 2 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	63-85262 2 months ago	63-85262 2 months ago	0-36287 10 hours
21745	robin-carlier author:robin-carlier	feat(AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms): Normal forms for `P_σ`s	We prove that admissible lists indeed provide a normal form for morphisms of satisfying `P_σ`. To this end, we introduce `standardσ`, a construction that takes a list and turn it into a composition of `σ i`s in `SimplexCategoryGenRel`. We then prove that, thangs to the fifth simplicial identity, composition on the right corresponds to simplicial insertion in the list. This gives existence of a normal form for every morphism satisfying `P_σ`. For unicity, we introduce an auxiliary function `simplicialEvalσ : (List ℕ) → ℕ → ℕ` and show that for admissible lists, it lifts to `ℕ` the `orderHom` attached to `toSimplexCategory.map standardσ`, 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`. --- - [ ] depends on: #21744 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory merge-conflict blocked-by-other-PR	1145/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	63-82887 2 months ago	63-82887 2 months ago	0-1277 21 minutes
21746	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`. --- - [ ] depends on: #21745 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory merge-conflict blocked-by-other-PR	1458/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	63-82887 2 months ago	63-82887 2 months ago	0-1140 19 minutes
21747	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: #21746 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory merge-conflict blocked-by-other-PR	1832/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean	5	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	63-82886 2 months ago	63-82886 2 months ago	0-1054 17 minutes
21748	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: #21747 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory merge-conflict blocked-by-other-PR	2253/0	Mathlib.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Equivalence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/NormalForms.lean,Mathlib/AlgebraicTopology/SimplicialObject/GeneratorsRelations.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	63-82885 2 months ago	63-82885 2 months ago	0-976 16 minutes
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	13	['eric-wieser', 'github-actions', 'hanwenzhu', 'kim-em', 'miguelmarco']	nobody	63-81788 2 months ago	63-81788 2 months ago	27-65384 27 days
16311	madvorak author:madvorak	feat(Computability): regular languages are context-free	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	63-65057 2 months ago	63-65057 2 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	63-64810 2 months ago	63-64810 2 months ago	37-29014 37 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	63-63045 2 months ago	63-63045 2 months ago	3-64280 3 days
21127	jt496 author:jt496	feat(Combinatorics/SimpleGraph): the Andrásfai–Erdős–Sós theorem	Co-authored-by: Lian Tattersall --- This is a draft version of our formalisation of the Andrásfai–Erdős–Sós theorem. We intend to split this into smaller pieces for review/revision. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict WIP	750/1	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/AndrasfaiErdosSos/AES.lean,Mathlib/Combinatorics/SimpleGraph/AndrasfaiErdosSos/Wheel.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Combinatorics/SimpleGraph/Coloring.lean,Mathlib/Combinatorics/SimpleGraph/CompletePartite.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Operations.lean	8	1	['github-actions']	nobody	62-66189 2 months ago	62-73404 2 months ago	0-0 0 seconds
19802	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/Arithmetic): `Ordinal.IsLimit` → `Order.IsSuccLimit`	This is part of a series of ordinal refactors which aim to replace definitions specific to `Ordinal` with more general concepts. See #17033 for more info. --- - [x] depends on: #19800 - [x] depends on: #19801 - [x] depends on: #19916 - [ ] depends on: #21751 Took us long enough. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict awaiting-author blocked-by-other-PR	513/335	Mathlib/MeasureTheory/MeasurableSpace/Card.lean,Mathlib/Order/SuccPred/Limit.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Arithmetic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Topology.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean	13	10	['YaelDillies', 'github-actions', 'kim-em', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	62-55724 2 months ago	62-55724 2 months ago	33-82297 33 days
18439	ADedecker author:ADedecker	refactor: use new algebraic filter bases API in `FiniteAdeleRing`	--- - [ ] 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 blocked-by-other-PR 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	61-55887 2 months ago	61-55887 2 months ago	0-619 10 minutes
21761	JovanGerb author:JovanGerb	feat(Algebra): add lemmas `mul_self` and `add_self`	This is point (4) in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Possible.20improvements.20to.20Lean.2FMathlib/near/499085779 I decided to go with `n + n = 2 * n` instead of `n + n = n * 2` because it feels more natural. Feel free to suggest the opposite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict delegated label:t-algebra$	206/196	Archive/Imo/Imo1959Q2.lean,Archive/Imo/Imo1961Q3.lean,Archive/Imo/Imo2008Q4.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2024Q3.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Wiedijk100Theorems/Partition.lean,Archive/ZagierTwoSquares.lean,Mathlib/Algebra/CharP/Two.lean,Mathlib/Algebra/CharZero/Lemmas.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Lie/Weights/RootSystem.lean,Mathlib/Algebra/Order/Field/Basic.lean,Mathlib/Algebra/Order/Group/Lattice.lean,Mathlib/Algebra/Order/Group/Unbundled/Abs.lean,Mathlib/Algebra/Order/Ring/Basic.lean,Mathlib/Algebra/Order/Ring/Unbundled/Basic.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Polynomial/Taylor.lean,Mathlib/Algebra/Ring/BooleanRing.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/Algebra/Ring/Hom/Defs.lean,Mathlib/Algebra/Ring/Int/Parity.lean,Mathlib/Algebra/Ring/Invertible.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Symmetrized.lean,Mathlib/Algebra/Tropical/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective.lean,Mathlib/Analysis/CStarAlgebra/CStarMatrix.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Convex/Mul.lean,Mathlib/Analysis/Convex/SpecificFunctions/Deriv.lean,Mathlib/Analysis/InnerProductSpace/LinearMap.lean,Mathlib/Analysis/Normed/Lp/ProdLp.lean,Mathlib/Analysis/NormedSpace/MStructure.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Bernstein.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Angle.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/Combinatorics/Additive/AP/Three/Defs.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Combinatorics/SimpleGraph/DegreeSum.lean,Mathlib/Combinatorics/SimpleGraph/Matching.lean,Mathlib/Computability/AkraBazzi/AkraBazzi.lean,Mathlib/Computability/Language.lean,Mathlib/Data/Complex/Abs.lean,Mathlib/Data/Complex/Module.lean,Mathlib/Data/Complex/Norm.lean,Mathlib/Data/ENNReal/Holder.lean,Mathlib/Data/ENNReal/Inv.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Choose/Central.lean,Mathlib/Data/Num/Lemmas.lean,Mathlib/Data/Num/Prime.lean,Mathlib/Data/Real/Pi/Irrational.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Dynamics/Circle/RotationNumber/TranslationNumber.lean,Mathlib/FieldTheory/Finite/Basic.lean,Mathlib/Geometry/Euclidean/Angle/Oriented/RightAngle.lean,Mathlib/Geometry/Euclidean/Angle/Unoriented/RightAngle.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Perm/Cycle/Type.lean,Mathlib/GroupTheory/SpecificGroups/Alternating.lean,Mathlib/GroupTheory/SpecificGroups/Dihedral.lean,Mathlib/GroupTheory/SpecificGroups/KleinFour.lean,Mathlib/LinearAlgebra/AffineSpace/Midpoint.lean,Mathlib/LinearAlgebra/Matrix/Charpoly/Eigs.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/LinearAlgebra/QuadraticForm/Complex.lean,Mathlib/LinearAlgebra/SesquilinearForm.lean,Mathlib/MeasureTheory/Function/L1Space/HasFiniteIntegral.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/Gamma.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/NumberTheory/Cyclotomic/Embeddings.lean,Mathlib/NumberTheory/FLT/Three.lean,Mathlib/NumberTheory/GaussSum.lean,Mathlib/NumberTheory/LegendreSymbol/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticReciprocity.lean,Mathlib/NumberTheory/ModularForms/EisensteinSeries/UniformConvergence.lean,Mathlib/NumberTheory/Multiplicity.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/PellMatiyasevic.lean,Mathlib/NumberTheory/SumPrimeReciprocals.lean	117	13	['JovanGerb', 'YaelDillies', 'github-actions', 'grunweg', 'mathlib-bors', 'riccardobrasca']	nobody	61-39388 2 months ago	61-70559 2 months ago	0-54729 15 hours
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	61-11766 2 months ago	137-4948 4 months ago	34-18388 34 days
20180	ChrisHughes24 author:ChrisHughes24	feat(ModelTheory): definable functions	--- Possibly this should be generalized to partial functions. - [x] depends on: #20166 - [ ] depends on: #20161 - [x] depends on: #20115 - [x] depends on: #20174 - [ ] depends on: #20175 - [ ] depends on: #21948 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	671/1	Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	60-63352 2 months ago	60-63352 2 months ago	0-563 9 minutes
20173	ChrisHughes24 author:ChrisHughes24	refactor(ModelTheory): tidy up proof of Ax-Grothendieck with definable functions	--- - [x] depends on: #20166 - [x] depends on: #20161 - [x] depends on: #20115 - [x] depends on: #20174 - [ ] depends on: #20175 - [ ] depends on: #20180 - [ ] depends on: #21948 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict blocked-by-other-PR	671/1	Mathlib.lean,Mathlib/ModelTheory/FunctionalFormula.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	4	6	['ChrisHughes24', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	60-63352 2 months ago	60-63352 2 months ago	0-0 0 seconds
21948	ChrisHughes24 author:ChrisHughes24	feat(ModelTheory): Formula.iSup and iInf	--- This was a slightly controversial addition discussed in #20175 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict	24/7	Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean	2	5	['YaelDillies', 'github-actions']	nobody	60-62861 2 months ago	60-62861 2 months ago	1-18127 1 day
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	60-49383 2 months ago	60-49383 2 months ago	0-0 0 seconds
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 merge-conflict blocked-by-other-PR 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	60-40759 2 months ago	60-40759 2 months ago	0-0 0 seconds
18206	vihdzp author:vihdzp	chore(SetTheory/Ordinal/Basic): golf/clean up `Cardinal.ord` theorems	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict awaiting-author	48/57	Mathlib/SetTheory/Ordinal/Basic.lean	1	5	['alreadydone', 'github-actions', 'urkud', 'vihdzp']	nobody	59-11144 2 months ago	59-11144 2 months ago	81-35878 81 days
18463	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Notation/FundamentalSequence): define type of fundamental sequences	We define `Sequence α` as the type of sequences with length 0, 1, or `ω`, and give a basic API. A subsequent PR will introduce the notion of a (countable and computable) fundamental sequence and establish basic results. The goal of this is to generalize [`ONote.fundamentalSequence`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/SetTheory/Ordinal/Notation.html#ONote.fundamentalSequence) to allow the construction of fundamental sequences for other ordinal notations. --- See [my ordinal notation repository](https://github.com/vihdzp/ordinal-notation/blob/a6fdd7fe7cb521e686ea271902e7e5496f1804d3/OrdinalNotation/Cantor.lean#L1218) for a demonstration of how this API looks in practice. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-order merge-conflict	174/1	Mathlib.lean,Mathlib/SetTheory/Ordinal/Notation/Cantor.lean,Mathlib/SetTheory/Ordinal/Notation/FundamentalSequence.lean	3	19	['YnirPaz', 'b-mehta', 'github-actions', 'vihdzp']	nobody	59-11143 2 months ago	59-11143 2 months ago	52-25108 52 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 - [ ] 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 blocked-by-other-PR 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	58-68436 1 month ago	58-68437 1 month ago	179-12934 179 days
12054	adomani author:adomani	feat: auto-bugs	This PR introduces a linter for suggesting bugs in tactics. See * #12077 * #12083 * #12084 for some bugs exposed by the test suite. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	58-21238 1 month ago	58-21238 1 month ago	45-6057 45 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. --- [![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	155/25	Mathlib.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Computability/Halting.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Quotient.lean,Mathlib/Data/MLList/Split.lean,Mathlib/Data/Matrix/Bilinear.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,scripts/noshake.json	19	n/a	['Command-Master', 'github-actions', 'grunweg', 'kmill', 'leanprover-bot', 'urkud']	nobody	57-79293 1 month ago	unknown	unknown
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	57-74945 1 month ago	57-74945 1 month ago	195-56460 195 days
21914	vasnesterov author:vasnesterov	Test PR for `order`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import merge-conflict WIP	2052/1507	Mathlib.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/ExtClass.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/ExactSequence.lean,Mathlib/Algebra/Homology/HomotopyCategory/DegreewiseSplit.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplex.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Homology/HomotopyCategory/MappingCone.lean,Mathlib/Algebra/Homology/HomotopyCategory/Pretriangulated.lean,Mathlib/Algebra/Homology/HomotopyCategory/Triangulated.lean,Mathlib/AlgebraicTopology/SimplexCategory/Basic.lean,Mathlib/AlgebraicTopology/SimplexCategory/MorphismProperty.lean,Mathlib/AlgebraicTopology/SimplicialSet/Coskeletal.lean,Mathlib/AlgebraicTopology/SimplicialSet/Path.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/Convex/Slope.lean,Mathlib/Analysis/Normed/Affine/Simplex.lean,Mathlib/Analysis/SpecialFunctions/BinaryEntropy.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Log/Monotone.lean,Mathlib/CategoryTheory/Abelian/ProjectiveDimension.lean,Mathlib/CategoryTheory/Functor/OfSequence.lean,Mathlib/CategoryTheory/Limits/Shapes/SequentialProduct.lean,Mathlib/Combinatorics/Schnirelmann.lean,Mathlib/Combinatorics/SetFamily/KruskalKatona.lean,Mathlib/Combinatorics/SimpleGraph/Connectivity/Subgraph.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/List/Nodup.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/Coxeter/Inversion.lean,Mathlib/GroupTheory/Coxeter/Length.lean,Mathlib/GroupTheory/Exponent.lean,Mathlib/MeasureTheory/Integral/PeakFunction.lean,Mathlib/MeasureTheory/Measure/Lebesgue/VolumeOfBalls.lean,Mathlib/MeasureTheory/Measure/LevyProkhorovMetric.lean,Mathlib/NumberTheory/ClassNumber/Finite.lean,Mathlib/NumberTheory/Fermat.lean,Mathlib/NumberTheory/FermatPsp.lean,Mathlib/NumberTheory/Modular.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/FinitePlaces.lean,Mathlib/NumberTheory/Padics/PadicVal/Basic.lean,Mathlib/Order/Basic.lean,Mathlib/Order/BasicLemmas.lean,Mathlib/Order/KrullDimension.lean,Mathlib/Order/RelSeries.lean,Mathlib/Probability/Distributions/Exponential.lean,Mathlib/Probability/Distributions/Gamma.lean,Mathlib/Probability/Distributions/Pareto.lean,Mathlib/Probability/StrongLaw.lean,Mathlib/RingTheory/AdicCompletion/Exactness.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Order.lean,MathlibTest/order.lean	58	4	['github-actions', 'leanprover-bot', 'vasnesterov']	nobody	57-56692 1 month ago	57-56693 1 month ago	0-0 0 seconds
16705	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. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict awaiting-author	130/0	Mathlib/Computability/Halting.lean	1	3	['YaelDillies', 'github-actions']	nobody	56-61445 1 month ago	56-61445 1 month ago	68-14150 68 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	56-40609 1 month ago	56-52663 1 month 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	56-39798 1 month ago	58-73282 1 month 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	55-48482 1 month ago	56-52226 1 month 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	54-56379 1 month ago	54-56379 1 month 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	53-31082 1 month ago	53-31082 1 month 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	52-59975 1 month ago	52-59975 1 month ago	2-604 2 days
22245	Champitoad author:Champitoad	feat(CategoryTheory/Subobject): add formalization of subobject classifier	This introduces a file `Classifier.lean` defining the notion `Classifier C` of subobject classifier in any category `C` with a terminal object, following Section I.3 of "Sheaves in Geometry and Logic" [MM92]. This is related to but independent from #21281, because our definition associates a characteristic map to every _subobject_ rather than every _monomorphism_. Adopting this "extensional" rather than "intensional" definition allows us to formalize the proof of Proposition 1 in [MM92, Section I.3] (`hasClassifier_isRepresentable_iff`), that `C` has a subobject classifier if and only if the subobjects presheaf `sub C` is representable. --- [![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	5219/2536	Cache/Hashing.lean,Cache/IO.lean,Cache/Lean.lean,Mathlib.lean,Mathlib/Algebra/Algebra/Defs.lean,Mathlib/Algebra/Category/AlgebraCat/Limits.lean,Mathlib/Algebra/Category/BoolRing.lean,Mathlib/Algebra/Category/FGModuleCat/Basic.lean,Mathlib/Algebra/Category/Grp/AB.lean,Mathlib/Algebra/Category/Grp/EpiMono.lean,Mathlib/Algebra/Category/HopfAlgebraCat/Monoidal.lean,Mathlib/Algebra/Category/ModuleCat/Abelian.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/Differentials/Basic.lean,Mathlib/Algebra/Category/ModuleCat/EpiMono.lean,Mathlib/Algebra/Category/ModuleCat/FilteredColimits.lean,Mathlib/Algebra/Category/ModuleCat/Kernels.lean,Mathlib/Algebra/Category/ModuleCat/Monoidal/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Colimits.lean,Mathlib/Algebra/Category/ModuleCat/Presheaf/Limits.lean,Mathlib/Algebra/Category/ModuleCat/Subobject.lean,Mathlib/Algebra/Category/MonCat/FilteredColimits.lean,Mathlib/Algebra/Category/Ring/Colimits.lean,Mathlib/Algebra/Category/Ring/Limits.lean,Mathlib/Algebra/Group/Commute/Units.lean,Mathlib/Algebra/Group/Pointwise/Set/Card.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/Double.lean,Mathlib/Algebra/Homology/HasNoLoop.lean,Mathlib/Algebra/Homology/Homotopy.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Degree/Operations.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/Sequence.lean,Mathlib/AlgebraicTopology/SimplexCategory/GeneratorsRelations/EpiMono.lean,Mathlib/Analysis/CStarAlgebra/Spectrum.lean,Mathlib/Analysis/Complex/AbelLimit.lean,Mathlib/Analysis/Complex/AbsMax.lean,Mathlib/Analysis/Complex/Angle.lean,Mathlib/Analysis/Complex/Arg.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Complex/CauchyIntegral.lean,Mathlib/Analysis/Complex/Circle.lean,Mathlib/Analysis/Complex/Hadamard.lean,Mathlib/Analysis/Complex/Isometry.lean,Mathlib/Analysis/Complex/Liouville.lean,Mathlib/Analysis/Complex/LocallyUniformLimit.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/Periodic.lean,Mathlib/Analysis/Complex/PhragmenLindelof.lean,Mathlib/Analysis/Complex/Positivity.lean,Mathlib/Analysis/Complex/Schwarz.lean,Mathlib/Analysis/Complex/UnitDisc/Basic.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Exp.lean,Mathlib/Analysis/Complex/UpperHalfPlane/Metric.lean,Mathlib/Analysis/Fourier/AddCircle.lean,Mathlib/Analysis/Fourier/AddCircleMulti.lean,Mathlib/Analysis/Fourier/FourierTransformDeriv.lean,Mathlib/Analysis/Fourier/Inversion.lean,Mathlib/Analysis/Fourier/PoissonSummation.lean,Mathlib/Analysis/InnerProductSpace/TwoDim.lean,Mathlib/Analysis/MellinTransform.lean,Mathlib/Analysis/Normed/Group/Continuity.lean,Mathlib/Analysis/Normed/Lp/WithLp.lean,Mathlib/Analysis/PSeries.lean,Mathlib/Analysis/PSeriesComplex.lean,Mathlib/Analysis/SpecialFunctions/CompareExp.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arctan.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Circle.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Complex/LogBounds.lean,Mathlib/Analysis/SpecialFunctions/Exp.lean,Mathlib/Analysis/SpecialFunctions/Exponential.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/FourierTransform.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/GaussianIntegral.lean,Mathlib/Analysis/SpecialFunctions/Gaussian/PoissonSummation.lean,Mathlib/Analysis/SpecialFunctions/ImproperIntegrals.lean,Mathlib/Analysis/SpecialFunctions/Integrals.lean,Mathlib/Analysis/SpecialFunctions/Log/Summable.lean,Mathlib/Analysis/SpecialFunctions/PolarCoord.lean,Mathlib/Analysis/SpecialFunctions/Pow/Asymptotics.lean,Mathlib/Analysis/SpecialFunctions/Pow/Continuity.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ArctanDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Basic.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/ComplexDeriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Cotangent.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/Series.lean,Mathlib/CategoryTheory/Abelian/FreydMitchell.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Connected.lean,Mathlib/CategoryTheory/Abelian/GrothendieckAxioms/Indization.lean,Mathlib/CategoryTheory/Abelian/GrothendieckCategory/Coseparator.lean	205	10	['Champitoad', 'github-actions', 'joelriou']	nobody	52-40897 1 month ago	52-42170 1 month ago	0-38059 10 hours
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	51-86378 1 month ago	51-86378 1 month ago	12-11675 12 days
14760	FR-vdash-bot author:FR-vdash-bot	feat: define `IGame`	--- - [ ] depends on: #7162 [diff](https://github.com/leanprover-community/mathlib4/compare/FR_game_relabelling..FR_igame) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-logic merge-conflict WIP	1427/661	Mathlib.lean,Mathlib/SetTheory/Game/Basic.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/IGame.lean,Mathlib/SetTheory/Game/Impartial.lean,Mathlib/SetTheory/Game/Nim.lean,Mathlib/SetTheory/Game/Ordinal.lean,Mathlib/SetTheory/Game/PGame.lean,Mathlib/SetTheory/Game/Relabelling.lean,Mathlib/SetTheory/Game/Short.lean,Mathlib/SetTheory/Surreal/Basic.lean,scripts/style-exceptions.txt	12	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	51-83209 1 month ago	51-83212 1 month ago	0-1038 17 minutes
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	51-61111 1 month ago	68-55175 2 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	51-59475 1 month ago	68-55039 2 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	51-38846 1 month ago	51-38847 1 month ago	0-61590 17 hours
18534	joelriou author:joelriou	feat(LinearAlgebra/PiTensorProduct): dependent version of tmulEquiv	Given a family of `R`-modules `N` indexed by `ι ⊕ ι'`, we obtain a linear equivalence `tmulEquivDep : (⨂[R] i₁, N (.inl i₁)) ⊗[R] (⨂[R] i₂, N (.inr i₂)) ≃ₗ[R] ⨂[R] i, N i`, which generalizes `tmulEquiv` (which is the case all `N i` are the same module). --- This will be used in #18527. [![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$	202/151	Mathlib/Analysis/NormedSpace/Multilinear/Curry.lean,Mathlib/Data/Sum/Basic.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Multilinear/TensorProduct.lean,Mathlib/LinearAlgebra/PiTensorProduct.lean,Mathlib/Logic/Function/Basic.lean	6	27	['eric-wieser', 'github-actions', 'jcommelin', 'joelriou', 'leanprover-bot', 'sgouezel']	nobody	51-2727 1 month ago	51-2727 1 month ago	19-59431 19 days
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	50-38477 1 month ago	50-38477 1 month 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	49-73408 1 month ago	49-73408 1 month ago	125-12755 125 days
20241	vasnesterov author:vasnesterov	feat(Data/Seq): coinductive predicates for sequences	* Introduce `All`, `Pairwise`, `AtLeastAsLongAs` predicates for sequences along with their coinductive principles and basic lemmas about them. * Priove `eq_of_bisim'` and `eq_of_bisim_strong` coinductive principles for equality. All of these "coinductive principles" are stated in the form as similar as possible to inductive principles. --- I also added `set_option linter.style.longFile 2000` in the beginning of `Seq.lean`, because I am not sure how to split this file. - [ ] depends on: #20160 This PR is necessary for a new tactic (#18486), which computes the asymptotics of real functions. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR	1207/409	Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean	2	3	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-83186 1 month ago	86-74266 2 months ago	0-215 3 minutes
21582	jjdishere author:jjdishere	feat(RingTheory/AdicCompletion): more APIs for IsAdicComplete	In this PR, we establish more APIs for IsAdicComplete. 1. Instead of checking the definition in `IsPrecomplete` (starting with a compatible sequence in M), we build APIs to lift elements (or maps) from compatible sequences in `M ⧸ I ^ n • ⊤`. 2. We also build APIs to lift a sequence of `LinearMap`s to `LinearMap` and a sequence of `RingHom`s to `RingHom` directly. 3. Since `I * ⊤` is not definitionally equal to `I`, we build special APIs for the `M = R` case, enabling one to use `R ⧸ I ^ n` instead of `R ⧸ I ^ n • ⊤`. 4. We generalize the compatible sequence from defined on every `M ⧸ I ^ n • ⊤` to only defined on `M ⧸ I ^ a n • ⊤` for a strictly increasing sequence `a n`. (I would use the case `a n = n + 1` in #21564 ) --- [![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$	406/10	Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/Ideal/Quotient/Defs.lean,Mathlib/RingTheory/Ideal/Quotient/PowTransition.lean	3	17	['github-actions', 'jjdishere', 'mergify', 'riccardobrasca']	riccardobrasca assignee:riccardobrasca	48-65945 1 month ago	48-65945 1 month ago	13-38587 13 days
22331	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): define integral perfectoid rings	In this PR, we define the integral perfectoid ring and the perfectoid pseudo uniformizers. --- - [ ] depends on: #21564 [![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 WIP label:t-algebra$	1099/15	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-65193 1 month ago	48-65193 1 month ago	0-0 0 seconds
22332	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map is surjective	In this PR, we show that Fontaine's theta map is surjective. --- - [ ] depends on: #21564 [![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 WIP label:t-algebra$	1127/15	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	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	48-65192 1 month ago	48-65192 1 month ago	0-37 37 seconds
18626	hannahfechtner author:hannahfechtner	feat : define Artin braid groups	Define the Artin braid group on infinitely many strands. Includes a toGroup function which defines a function out of the braid group to any other group (given a function which satisfies the braid relations) (more to come in this file; next up: Artin braid groups on finitely many strands) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	48-57719 1 month ago	48-57719 1 month ago	15-40648 15 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/)	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	48-52708 1 month ago	283-67005 9 months ago	7-68358 7 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	48-51439 1 month ago	unknown	unknown
21158	smmercuri author:smmercuri	feat: the finite adele ring is locally compact if each of the ring of integers is compact	Under the assumption that each of the `v.adicCompletionIntegers K` is compact, then we show that `FiniteAdeleRing R K` is locally compact, where `R` is a Dedekind domain and `K` is its field of fractions. --- - [x] depends on: #21159 - [x] depends on: #21160 - [ ] depends on: #21162 - [x] depends on #21163 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	FLT t-algebra merge-conflict blocked-by-other-PR label:t-algebra$	225/1	Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/DedekindDomain/FiniteAdeleRing.lean,Mathlib/Topology/Algebra/Group/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	47-78871 1 month ago	80-60237 2 months ago	0-631 10 minutes
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	3685/3	Mathlib.lean,Mathlib/CategoryTheory/Monoidal/Bimod_Class.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_Class.lean,Mathlib/CategoryTheory/Monoidal/Internal/ModuleClass.lean,Mathlib/CategoryTheory/Monoidal/Mod_Class.lean,Mathlib/CategoryTheory/Monoidal/Mon_Class.lean,Mathlib/CategoryTheory/Monoidal/mwe.lean	11	n/a	['YaelDillies', 'github-actions', 'yuma-mizuno']	nobody	47-9112 1 month 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	46-74529 1 month ago	46-74529 1 month ago	0-0 0 seconds
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	46-74029 1 month ago	46-74029 1 month 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	46-68099 1 month ago	46-68099 1 month 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	46-68098 1 month ago	46-68098 1 month 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	46-62933 1 month ago	46-62933 1 month ago	0-0 0 seconds
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 furhter 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	46-59484 1 month ago	173-75992 5 months ago	129-57991 129 days
21339	vihdzp author:vihdzp	fix(Data/List/Lex): remove duplicate `List.LE` instance	Mathlib currently duplicates the Lean core instance for `≤` in lists in an incompatible way. We delete this duplicate instance. See [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Two.20.60List.2ELE.60.20instances.3F/near/497241115). --- This is a very quick and dirty fix. Core Lean provides all of the theorems we need to prove `≤` forms a linear order, but it provides them in terms of `Std` relation typeclasses which currently see no use in Mathlib. I've added the instances that were required to get the list theorems working. In the future, we really ought to unify the core and Mathlib relation typeclasses. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	24/22	Mathlib/Data/List/Lex.lean,Mathlib/Data/String/Basic.lean,Mathlib/Topology/Category/Profinite/Nobeling.lean	3	1	['github-actions']	nobody	46-55271 1 month ago	46-55271 1 month ago	16-65973 16 days
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/)	large-import t-algebra merge-conflict awaiting-author label:t-algebra$	53/1	Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/Topology/MetricSpace/IsometricSMul.lean	2	6	['YaelDillies', 'github-actions', 'grunweg', 'urkud']	eric-wieser assignee:eric-wieser	46-49254 1 month ago	46-49254 1 month ago	193-70524 193 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	46-15832 1 month ago	46-15832 1 month ago	92-44198 92 days
16837	vihdzp author:vihdzp	feat(Data/List/SplitBy): characterization of `List.splitBy`	--- - [x] depends on: #16818 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict awaiting-author	151/9	Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/SplitBy.lean	2	13	['YaelDillies', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	46-15586 1 month ago	46-15586 1 month ago	9-85039 9 days
16421	FR-vdash-bot author:FR-vdash-bot	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. --- 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. [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/migrate.20to.20.60QuotLike.60.20API) [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data RFC merge-conflict awaiting-author	735/1	Mathlib.lean,Mathlib/Data/QuotLike.lean,Mathlib/Logic/Relation.lean,test/QuotLike.lean	4	7	['FR-vdash-bot', 'YaelDillies', 'github-actions', 'urkud']	nobody	46-15586 1 month ago	46-15586 1 month ago	58-8650 58 days
17105	vihdzp author:vihdzp	feat(Data/List/RunLength): run-length encoding	We define the run-length encoding of a list. We provide a basic API, as well as a recursion principle. --- - [ ] depends on: #16837 - [x] depends on: #17106 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict blocked-by-other-PR	286/1	Mathlib/Data/List/Flatten.lean,Mathlib/Data/List/RunLength.lean,Mathlib/Data/List/SplitBy.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	46-15585 1 month ago	46-15585 1 month ago	0-0 0 seconds
19700	vihdzp author:vihdzp	chore(SetTheory/Ordinal/Basic): tweak `type r = 0`, `type r = 1`, etc. lemmas	We give shorter names to these lemmas (e.g. `type_eq_zero` instead of `type_eq_zero_of_empty`), and deprecate a bunch of duplicates. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory awaiting-CI merge-conflict	51/38	Mathlib/SetTheory/Ordinal/Basic.lean	1	1	['github-actions']	nobody	46-15339 1 month ago	46-15339 1 month ago	0-0 0 seconds
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	44-63080 1 month ago	44-63080 1 month ago	0-17 17 seconds
21959	BGuillemet author:BGuillemet	feat(Topology/ContinuousMap): Stone-Weierstrass theorem for MvPolynomial	Add the subalgebra of multivariate polynomials and prove it separates points, on the same model as `ContinuousMap/Polynomial.lean`. Prove the Stone-Weierstrass theorem and some variations for multivariate polynomials. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	44-59422 1 month ago	44-59422 1 month ago	16-76141 16 days
22532	jcommelin author:jcommelin	chore(RingTheory/TensorProduct): cleanup	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	68/28	Mathlib/RingTheory/Finiteness/TensorProduct.lean,Mathlib/RingTheory/TensorProduct/Adjoin.lean,Mathlib/RingTheory/TensorProduct/Basic.lean,Mathlib/RingTheory/TensorProduct/Finite.lean	4	1	['github-actions']	nobody	44-54717 1 month ago	44-54717 1 month ago	0-31 31 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	42-77676 1 month ago	42-77676 1 month ago	0-0 0 seconds
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	42-61435 1 month ago	42-61435 1 month 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	42-61189 1 month ago	42-61189 1 month 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	42-60354 1 month ago	42-60354 1 month ago	0-0 0 seconds
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 - [ ] 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 blocked-by-other-PR 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	40-44657 1 month ago	95-73771 3 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	40-30849 1 month ago	40-30849 1 month ago	130-5197 130 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 maintainer-merge 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	39-50427 1 month ago	39-50427 1 month ago	43-81255 43 days
22538	vasnesterov author:vasnesterov	feat(Analysis): radius of convergence for binomial series	Introduce the binomial series as `FormalMultilinearSeries`, and prove that its radius of convergence is `1`. --- - [x] depends on: #22518 - [ ] depends on: #22531 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	228/8	Mathlib.lean,Mathlib/Algebra/BigOperators/Ring/List.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/RingTheory/Binomial.lean,scripts/noshake.json	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	39-37154 1 month ago	39-37154 1 month ago	0-1173 19 minutes
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	39-23725 1 month ago	39-23725 1 month ago	1-84890 1 day
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	t-algebra t-topology merge-conflict WIP label:t-algebra$	919/102	Mathlib/Algebra/Order/Monoid/Unbundled/Defs.lean,Mathlib/RingTheory/Valuation/Basic.lean,Mathlib/RingTheory/Valuation/RankOne.lean,Mathlib/Topology/Algebra/Valued/NormedValued.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/ValuedField.lean,docs/references.bib	7	8	['AntoineChambert-Loir', 'github-actions', 'jcommelin']	nobody	38-62597 1 month ago	38-62597 1 month ago	0-119 1 minute
22603	pechersky author:pechersky	chore(Topology): rename pi family from π to X	Only in files that mentioned such a family, via a script: ``` git grep -e "π : . → Type" --name-only \| rg Topology \| xargs -I{} sed -i -e 's/π/X/g' {} ``` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-topology merge-conflict	232/232	Mathlib/Topology/AlexandrovDiscrete.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/Module/Equiv.lean,Mathlib/Topology/Algebra/Order/LiminfLimsup.lean,Mathlib/Topology/Bases.lean,Mathlib/Topology/Bornology/Constructions.lean,Mathlib/Topology/Connected/Basic.lean,Mathlib/Topology/Connected/Clopen.lean,Mathlib/Topology/Connected/LocallyConnected.lean,Mathlib/Topology/Connected/TotallyDisconnected.lean,Mathlib/Topology/Constructions.lean,Mathlib/Topology/ContinuousOn.lean,Mathlib/Topology/EMetricSpace/Diam.lean,Mathlib/Topology/EMetricSpace/Pi.lean,Mathlib/Topology/ExtremallyDisconnected.lean,Mathlib/Topology/Inseparable.lean,Mathlib/Topology/MetricSpace/Basic.lean,Mathlib/Topology/MetricSpace/Infsep.lean,Mathlib/Topology/MetricSpace/ProperSpace.lean,Mathlib/Topology/MetricSpace/Pseudo/Pi.lean,Mathlib/Topology/Metrizable/Basic.lean,Mathlib/Topology/Order/Basic.lean,Mathlib/Topology/Separation/Hausdorff.lean,Mathlib/Topology/UniformSpace/Ascoli.lean	24	1	['github-actions']	nobody	38-61153 1 month ago	38-61153 1 month ago	5-80034 5 days
17368	Felix-Weilacher author:Felix-Weilacher	feat(Topology/Baire/BaireMeasurable): add the Kuratowski-Ulam theorem	Add the Kuratowski-Ulam theorem, which one can think of as a "Fubini" for Baire category. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	38-54918 1 month ago	38-54918 1 month ago	72-13986 72 days
22349	dtumad author:dtumad	feat(Control): Laws for monads with compatible `failure` operation	Add a class for a `Monad` that also has an `Alternative` instance, and a class `LawfulAlternative` for types where the failure and monad structures are compatible in the expected way. --- I'm not sure if this should instead go in `Batteries.Control` instead of mathlib, or at least lemmas like `OptionT.run_failure` maybe should. Some of the instances like `Set` would still need to be added in mathlib either way. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict WIP	175/3	Mathlib.lean,Mathlib/Control/Lawful.lean,Mathlib/Control/Monad/AlternativeMonad.lean	3	8	['dtumad', 'eric-wieser', 'github-actions', 'quangvdao']	nobody	37-37767 1 month ago	37-37767 1 month ago	1-20563 1 day
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	37-30581 1 month ago	218-82931 7 months 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	36-60020 1 month ago	36-60020 1 month ago	1-79072 1 day
22322	mariainesdff author:mariainesdff	feat(RingTheory/DividedPowers/RatAlgebra): add definitions	In this file we show that, for certain choices of a commutative (semi)ring `A` and an ideal `I` of `A`, the family of maps `ℕ → A → A` given by `fun n x ↦ x^n/n!` is a divided power structure on `I`. Co-authored-by: AntoineChambert-Loir --- - [x] depends on: #22237 - [x] depends on: #22239 - [x] depends on: #22240 [![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$	308/0	Mathlib.lean,Mathlib/Data/Nat/Factorial/NatCast.lean,Mathlib/RingTheory/DividedPowers/RatAlgebra.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	36-59239 1 month ago	36-59239 1 month ago	1-78820 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	36-55248 1 month ago	36-55248 1 month ago	29-48368 29 days
8793	101damnations author:101damnations	feat(RepresentationTheory/GroupCohomology/Hilbert90): add Hilbert's original theorem 90	--- This PR proves that given a finite cyclic Galois extension $L/K,$ a generator $g \in Gal(L/K),$ and an element `x : L` such that $N_{L/K}(x) = 1,$ there exists `y : L` such that $g(y)/y = x.$ It's a direct proof instead of analysing the cohomology of finite cyclic groups in general, but I'm hoping the API should still be useful for/alongside that. - [x] depends on: #8785 [![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$	213/11	Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/RepresentationTheory/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Rep.lean	4	3	['github-actions', 'joelriou', 'leanprover-community-mathlib4-bot']	nobody	36-14437 1 month ago	36-14438 1 month 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	4	['github-actions', 'j-loreaux', 'leanprover-bot']	nobody	36-3444 1 month ago	36-3445 1 month ago	0-27 27 seconds
20171	mitchell-horner author:mitchell-horner	feat(Combinatorics/SimpleGraph): define turanDensity	Define the Turán density `turanDensity H` of a simple graph `H`: `turanDensity H` is the limit of `extremalNumber (Fin n) H / n.choose 2` as `n` approaches `∞`. Also prove - the Turán density of a simple graph is well-defined, that is, the limit `extremalNumber (Fin n) H / n.choose 2` as `n` approaches `∞` exists, - `extremalNumber (Fin n) H` is asymptotically equivalent to `turanDensity H * n.choose 2` as `n` approaches `∞`. --- - [ ] depends on: #19865 - [ ] depends on: #20681 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import new-contributor t-combinatorics merge-conflict blocked-by-other-PR WIP	854/95	Mathlib.lean,Mathlib/Combinatorics/SimpleGraph/Basic.lean,Mathlib/Combinatorics/SimpleGraph/DeleteEdges.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/TuranDensity.lean,Mathlib/Combinatorics/SimpleGraph/Finite.lean,Mathlib/Combinatorics/SimpleGraph/Subgraph.lean,Mathlib/Combinatorics/SimpleGraph/SubgraphIso.lean,Mathlib/Combinatorics/SimpleGraph/Walk.lean,Mathlib/Data/Sym/Sym2.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-3967 1 month ago	35-3967 1 month ago	0-2015 33 minutes
20240	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 on the vertex type `V` have at most `(card β-1)^(1/(card α))(card V)^(2-1/(card α))/2+(card α)(card V)/2` edges. --- - [ ] depends on: #19865 - [ ] depends on: #20738 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-combinatorics merge-conflict blocked-by-other-PR WIP	810/0	Mathlib.lean,Mathlib/Analysis/SpecialFunctions/Pochhammer.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/Basic.lean,Mathlib/Combinatorics/SimpleGraph/Extremal/KovariSosTuran.lean,Mathlib/Combinatorics/SimpleGraph/SubgraphIso.lean,Mathlib/Data/Nat/Choose/Cast.lean,Mathlib/RingTheory/Polynomial/Pochhammer.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	35-3950 1 month ago	35-3950 1 month ago	0-555 9 minutes
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	34-65960 1 month ago	34-65960 1 month ago	0-0 0 seconds
8949	sebzim4500 author:sebzim4500	Add `by_approx` tactic for proving real inequalities using rational approximation	feat: Add `by_approx` tactic for proving real inequalities by finding rational approximations --- ```lean example : \|sqrt 2 - 1.414\| < 0.001 := by by_approx ``` This is a work in progress, the code is messy and the tactic is often very slow. It also depends on some other PRs that haven't been merged yet. It currently supports basic operations (`+`, `-`, `*`, `/`, `abs`) and has approximation extensions for `sqrt` and `exp`. - [ ] depends on: #8167 - [ ] 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 blocked-by-other-PR	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	['leanprover-community-mathlib4-bot']	nobody	34-41720 1 month ago	326-3124 10 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	32-81677 1 month ago	32-81677 1 month ago	10-48025 10 days
20424	erdOne author:erdOne	feat(RingTheory): evaluation of power series	--- - [ ] depends on: #20425 - [x] depends on: #20426 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	425/8	Mathlib.lean,Mathlib/RingTheory/AdicCompletion/Noetherian.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/PowerSeries/Basic.lean,Mathlib/RingTheory/PowerSeries/Eval.lean,Mathlib/RingTheory/PowerSeries/Trunc.lean	6	11	['AntoineChambert-Loir', 'alreadydone', 'erdOne', 'eric-wieser', 'github-actions', 'mathlib4-dependent-issues-bot']	nobody	32-60140 1 month ago	67-41088 2 months ago	0-3944 1 hour
21564	jjdishere author:jjdishere	feat(RingTheory/Perfectoid): Fontaine's theta map and the de Rham period rings	In this PR, we define the Fontaine's theta map and the peroid ring B_dR. --- - [x] depends on: #21563 [untilt map] - [ ] depends on: #21582 - [ ] depends on: #22320 - [ ] depends on: #22330 [which depends on the previous one] [![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$	1044/15	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	5	['AntoineChambert-Loir', 'github-actions', 'jjdishere', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	32-56756 1 month ago	48-65946 1 month ago	0-0 0 seconds
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	32-27311 1 month ago	32-27311 1 month ago	7-47472 7 days
15991	vihdzp author:vihdzp	feat(SetTheory/Ordinal/CantorNormalForm): alternate CNF recursion principle	The idea of this recursion principle is that you can build an ordinal by adding one power of `b` at a time, as long as `1 < b ≤ ω`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	43/0	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/CantorNormalForm.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	3	8	['YaelDillies', 'eric-wieser', 'github-actions', 'vihdzp']	nobody	31-75495 1 month ago	31-75495 1 month ago	91-50443 91 days
17758	vihdzp author:vihdzp	feat(SetTheory/Ordinal/ENat): `Ordinal.toENat`	We essentially copy the `Cardinal/ENat` file but make it for ordinals instead. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	300/0	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	2	['Command-Master', 'github-actions', 'vihdzp']	nobody	31-75024 1 month ago	31-75024 1 month ago	126-40106 126 days
19698	vihdzp author:vihdzp	refactor(SetTheory/Cardinal/Cofinality): redefine `Order.cof`	We redefine `Order.cof` as a function on preorders, rather than one well-ordered relations. This allows us to use the `IsCofinal` API, alongside all the other goodies that come from a proper order structure. Finally, we clean up the `Ordinal.cof` API by relying on order results, rather than trying to haphazardly treat ordinals as sets. --- - [ ] depends on: #21972 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict WIP	502/583	Mathlib/Order/Cofinal.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Basic.lean	4	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	31-73035 1 month ago	31-73035 1 month ago	0-0 0 seconds
21856	vihdzp author:vihdzp	chore(SetTheory/Cardinal/Basic): generalize universes of `sum_le_iSup_lift`	We prove a more general version of the lemma which talks about families `ι → Cardinal.{v}` with `Small.{v} ι`, rather than just families `f : ι → Cardinal.{max u v}` with `ι : Type v`. We keep the old version, as it's seemingly more useful under common circumstances. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	16/10	Mathlib/SetTheory/Cardinal/Basic.lean	1	6	['b-mehta', 'github-actions', 'vihdzp']	nobody	31-72911 1 month ago	31-72911 1 month ago	32-26420 32 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	31-32917 1 month ago	31-32919 1 month ago	0-0 0 seconds
8102	miguelmarco author:miguelmarco	feat (Tactic): add unify_denoms and collect_signs tactics	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 awaiting-author enhancement	431/1	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Data/Int/Order/Lemmas.lean,Mathlib/Data/Nat/Basic.lean,Mathlib/Data/Nat/Order/Lemmas.lean,Mathlib/Tactic.lean,Mathlib/Tactic/CollectSigns.lean,Mathlib/Tactic/UnifyDenoms.lean	8	16	['github-actions', 'joneugster', 'kbuzzard', 'miguelmarco']	nobody	30-55654 30 days ago	63-86119 2 months ago	17-12620 17 days
19013	quangvdao author:quangvdao	feat(Algebra/BigOperators/Fin): Add `finSigmaFinEquiv`	This PR adds `finSigmaFinEquiv` which is the equivalence `(i : Fin m) × Fin (n i) ≃ Fin (∑ i, n i)`. This is the dependent version of `finProdFinEquiv`. CI should be passing, but there are two things I'd like feedback on: 1. When defining the mappings, I have to consider `m = 0` separately. Is there a more uniform definition? 2. I'm proving this as a step toward defining `Fin.join`, which is the analogue of `List.join`. I can now technically define `Fin.join` as: ``` variable {a : Fin n → ℕ} {α : (i : Fin n) → (j : Fin (a i)) → Sort*} def join (v : (i : Fin n) → (j : Fin (a i)) → α i j) (k : Fin (∑ i, a i)) : α (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 := v (finSigmaFinEquiv.invFun k).1 (finSigmaFinEquiv.invFun k).2 ``` but this looks horrible. This highly motivates refactoring `invFun` as two new definitions: ``` def func1 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin n := sorry def func2 {n : ℕ} (a : Fin n → ℕ) (k : Fin (∑ i, a i)) : Fin (a (func1 a k)) := sorry ``` I'm not sure what to call these functions. The analogues in the non-dependent case are `divNat` and `modNat`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	30-49344 30 days ago	30-49344 30 days ago	3-28829 3 days
20410	vihdzp author:vihdzp	refactor: redefine `Equiv.Set.sumCompl = Equiv.sumCompl`	It's still useful to have `Equiv.Set.sumCompl` around, as `simp` can't otherwise see through the def-eq `{x // x ∈ s} ⊕ {x // ¬ x ∈ s} = s ⊕ sᶜ`. --- - [ ] depends on: #20850 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data awaiting-CI merge-conflict blocked-by-other-PR WIP	33/21	Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Fintype.lean,Mathlib/Logic/Equiv/Set.lean	3	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	30-10757 30 days ago	30-10757 30 days ago	0-0 0 seconds
20850	vihdzp author:vihdzp	chore(Logic/Equiv/Basic): extend `sumCompl` API	We make a couple of redundant arguments implicit, rename two misnamed theorems, and add two new ones. --- I'm not sure if the theorems I renamed actually had the correct name; if they did, then [`Equiv.Set.sumCompl_symm_apply_of_mem`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Logic/Equiv/Set.html#Equiv.Set.sumCompl_symm_apply_of_mem) and [`Equiv.Set.sumCompl_symm_apply_of_not_mem`](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Logic/Equiv/Set.html#Equiv.Set.sumCompl_symm_apply_of_not_mem) should be renamed instead to match. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data t-logic merge-conflict awaiting-author	21/6	Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Fintype.lean	2	5	['eric-wieser', 'github-actions', 'grunweg', 'kbuzzard', 'vihdzp']	nobody	30-10633 30 days ago	30-10633 30 days ago	28-73677 28 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. - [ ] 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	29-77644 29 days ago	225-27651 7 months ago	28-21477 28 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	29-37892 29 days ago	29-37892 29 days ago	0-0 0 seconds
15915	vihdzp author:vihdzp	chore(SetTheory/Ordinal/CantorNormalForm): `CNF.exponents` and `CNF.coeffs`	We rewrite theorems about the Cantor Normal Form in terms of their lists of exponents and coefficients, instead of awkwardly talking about their first and second entries. We also put all theorems about the CNF in its own namespace. This keeps us from cluttering the `Ordinal` namespace, and it also avoids having to prefix everything by `CNF_` constantly. --- - [x] depends on: #16998 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	117/44	Mathlib/SetTheory/Ordinal/CantorNormalForm.lean	1	32	['Command-Master', 'YaelDillies', 'YnirPaz', 'digama0', 'github-actions', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	29-19222 29 days ago	29-19222 29 days ago	53-79724 53 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	29-18977 29 days ago	29-18977 29 days ago	47-37012 47 days
21751	vihdzp author:vihdzp	refactor(SetTheory/Ordinal/Arithmetic): rework `Ordinal.pred` API	This PR does the following: - give a simpler definition of `Ordinal.pred` - replace `¬ ∃ a, o = succ a` and `∀ a, o ≠ succ a` by `IsSuccPrelimit o` throughout - improve theorem names --- There's a legitimate question of whether we even want `Ordinal.pred` (see [Zulip](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Ordinal.2Epred)) but this should be a good change in the meanwhile regardless. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory maintainer-merge merge-conflict	102/67	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Exponential.lean	2	12	['YaelDillies', 'github-actions', 'vihdzp']	nobody	29-15560 29 days ago	29-15560 29 days ago	36-50134 36 days
22987	BoltonBailey author:BoltonBailey	chore(Logic/Equiv/Basic): split subtype lemmas from file	This PR addresses an instance of the long file linter by separating definitions and lemmas relating to equivalences on subtypes from this file. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	tech debt t-logic merge-conflict	568/538	Mathlib.lean,Mathlib/Algebra/Group/Equiv/Basic.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/CategoryTheory/Limits/HasLimits.lean,Mathlib/Combinatorics/Quiver/Covering.lean,Mathlib/Control/ULiftable.lean,Mathlib/Data/Set/SymmDiff.lean,Mathlib/Data/ULift.lean,Mathlib/Logic/Embedding/Basic.lean,Mathlib/Logic/Equiv/Basic.lean,Mathlib/Logic/Equiv/Subtype.lean,Mathlib/Order/SymmDiff.lean,MathlibTest/symm.lean	13	5	['BoltonBailey', 'Vierkantor', 'github-actions', 'urkud']	nobody	28-50140 28 days ago	28-50140 28 days ago	4-80383 4 days
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	28-50135 28 days ago	28-50135 28 days ago	0-806 13 minutes
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	27-68380 27 days ago	27-68381 27 days 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	27-68135 27 days ago	27-68135 27 days ago	0-15573 4 hours
23138	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 n-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: #22059 defines manifolds with smooth boundary. That PR has two open dependencies; one is slowly getting merged, that other has a few sorries I still need to prove (not difficult). - depends on: #22874 for some constructions - defining unoriented bordisms, and proving some basic constructions about them: will be another PR [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-differential-geometry merge-conflict WIP	1299/3	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/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/MFDeriv/SpecificFunctions.lean	7	0	[]	nobody	27-41805 27 days ago	28-50136 28 days ago	0-1 1 second
15686	robertmaxton42 author:robertmaxton42	refactor(LinearAlgebra/FreeProduct): move PowerAlgebra construction to its own namespace, minor simp opts	* Make the namespace `asPowers` to simplify/shorten names when working primarily with the power algebra construction of the free product * Also adds related some convenience API to `rel'` * Add simp shortcut attribute to `lift_comp_ι` and add simp shortcut lemma `lift_algebraMap` * Replaces some `aesop` calls with `simp_rw` for performance --- [![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$	143/11	Mathlib/LinearAlgebra/FreeProduct/Basic.lean	1	19	['YaelDillies', 'github-actions', 'kbuzzard', 'robertmaxton42']	nobody	27-26811 27 days ago	131-59381 4 months ago	80-18014 80 days
21463	riccardobrasca author:riccardobrasca	add algEquiv_comp_algebraMap	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-number-theory merge-conflict WIP label:t-algebra$	233/54	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/IntegralClosure.lean,Mathlib/RingTheory/Ideal/Norm/RelNorm.lean,Mathlib/RingTheory/Localization/AtPrime.lean,Mathlib/RingTheory/Localization/Basic.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/LocalizationLocalization.lean,Mathlib/RingTheory/Localization/Separable.lean,Mathlib/RingTheory/RingHom/Finite.lean	9	4	['github-actions', 'leanprover-bot', 'riccardobrasca']	nobody	25-55410 25 days ago	25-55410 25 days ago	0-1459 24 minutes
9273	grunweg author:grunweg	feat: extended charts are local diffeomorphisms on their source	--- 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 blocked-by-other-PR	225/12	Mathlib/Geometry/Manifold/ContMDiff/Atlas.lean,Mathlib/Geometry/Manifold/LocalDiffeomorph.lean,Mathlib/Topology/Algebra/Module/Basic.lean	3	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	25-33594 25 days ago	120-39757 3 months ago	205-50446 205 days
12664	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. needed by #11106 --- - [ ] depends on: #13861 [So that we can prove `optionEquivLeft_support` analogously to `finSuccEquiv_support`] [![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$	50/0	Mathlib/Algebra/MvPolynomial/Equiv.lean	1	2	['github-actions', 'leanprover-community-mathlib4-bot']	nobody	24-70986 24 days ago	39-51442 1 month ago	0-0 0 seconds
22714	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.	large-import new-contributor t-measure-probability merge-conflict awaiting-author	300/14	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	['EtienneC30', 'Paul-Lez', 'github-actions']	EtienneC30 assignee:EtienneC30	24-59585 24 days ago	28-41695 28 days ago	12-38130 12 days
15774	kkytola author:kkytola	feat: Topology on `ENat`	This PR may contain some results that are not in the PR that adds a toppology on `ENat`. --- The immediate motivation is to be able to make the right continuity statement of the extended floor function on `ENNReal`, when this floor function is made `ENat`valued as suggested in the PR review of #15269. The API here is modelled on the early parts of [the corresponding ENNReal file](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/Instances/ENNReal.html#top), although much of this case is more trivial. - [x] depends on: #15380 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	23-25912 23 days ago	23-25912 23 days ago	0-6819 1 hour
23333	mariainesdff author:mariainesdff	feat(Analysis.Normed.Unbundled.SpectralNormUnique): prove unique extension theorem	Let `K` be a field complete with respect to a nontrivial nonarchimedean multiplicative norm and `L/K` be an algebraic extension. We show that the spectral norm on `L` is a nonarchimedean multiplicative norm, and any power-multiplicative `K`-algebra norm on `L` coincides with the spectral norm. More over, if `L/K` is finite, then `L` is a complete space. This result is [S. Bosch, U. Güntzer, R. Remmert,Non-Archimedean Analysis (Theorem 3.2.4/2)][bosch-guntzer-remmert]. --- - [ ] depends on: #23301 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis t-number-theory merge-conflict blocked-by-other-PR	1487/3	Mathlib.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Normed/Unbundled/AlgNormOfGalois.lean,Mathlib/Analysis/Normed/Unbundled/RingSeminorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNormUnique.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Real/IsNonarchimedean.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	21	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-75849 22 days ago	22-75849 22 days ago	0-0 0 seconds
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 - [ ] depends on: #22911 [![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$	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	22-58973 22 days ago	22-58973 22 days ago	0-3552 59 minutes
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	22-48664 22 days ago	unknown	unknown
22073	vasnesterov author:vasnesterov	feat(Tactic/Order): frontend for `order`	Support `order [h1, h2]` and `order only [h1, h2]` syntax. --- - [ ] depends on: #21966 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict blocked-by-other-PR	983/1	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Order.lean,Mathlib/Tactic/Order/CollectFacts.lean,Mathlib/Tactic/Order/Graph/Basic.lean,Mathlib/Tactic/Order/Graph/Tarjan.lean,Mathlib/Tactic/Order/Preprocessing.lean,MathlibTest/order.lean,scripts/noshake.json	9	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	22-40931 22 days ago	54-18301 1 month ago	0-32 32 seconds
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	22-5105 22 days ago	22-5105 22 days 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	21-60461 21 days ago	21-60461 21 days ago	0-0 0 seconds
21356	Multramate author:Multramate	chore(AlgebraicGeometry/EllipticCurve/Affine): split affine files	The files `Jacobian.lean` and `Projective.lean` are getting too long, and are expecting even more code in the near future, so I believe this is a good time to split them. Naturally, `Affine.lean` and `Group.lean` will be refactored in a similar fashion. - Refactor `Affine.lean` and `Group.lean` into `Affine/Basic.lean` (API for equations and nonsingularity), `Affine/Formula.lean` (formulae for group operations), and `Affine/Point.lean` (API for points and the group law) Note that material on the coordinate ring will very likely be refactored to another file `Affine/Universal.lean` in the near future, since this PR is large enough already. The other files are handled in other PRs. - #22545 splits `Jacobian.lean` into `Jacobian/Basic.lean` (API for weighted triples, equations, and nonsingularity), `Jacobian/Formula.lean` (formulae for group operations), and `Jacobian/Point.lean` (API for points and the group law) - #22549 splits `Projective.lean` into `Projective/Basic.lean` (API for unweighted triples, equations, and nonsingularity), `Projective/Formula.lean` (formulae for group operations), and `Projective/Point.lean` (API for points and the group law) --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebraic-geometry merge-conflict WIP	1149/1162	Mathlib.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Affine/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/DivisionPolynomial/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Jacobian/Point.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Basic.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Formula.lean,Mathlib/AlgebraicGeometry/EllipticCurve/Projective/Point.lean	12	n/a	['github-actions', 'grunweg']	nobody	20-42014 20 days ago	unknown	unknown
22930	chrisflav author:chrisflav	refactor(RingTheory/RingHom): factor out proofs for `Algebra.FinitePresentation`	The current way to use locality of a given property of algebras is to convert everything into the language of `RingHom`s and then for example the `RingHom.OfLocalizationSpanTarget` API. This has two disadvantages: 1. The ring hom property API fixes the universes of source and target to be the same, hence we unnecessarily lose out on some universe generality. 2. The results for `RingHom`s are proven by translating everything in terms of `Algebra`, so we duplicate the translation steps. This PR refactors `RingHom.FinitePresentation` to do all locality proofs in the language of `Algebra`s and translate it into the corresponding `RingHom.OfLocalizationSpan{Target}` in the last step. We also streamline some of the translation proofs by unifying the API. --- - [ ] depends on: #22931 [![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$	267/200	Mathlib/RingTheory/FinitePresentation.lean,Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/FinitePresentation.lean,Mathlib/RingTheory/RingHom/FiniteType.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	8	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	19-33551 19 days ago	19-33551 19 days ago	0-1344 22 minutes
22931	chrisflav author:chrisflav	refactor(RingTheory/RingHom): factor out proofs for `Algebra.FiniteType`	The current way to use locality of a given property of algebras is to convert everything into the language of `RingHom`s and then for example the `RingHom.OfLocalizationSpanTarget` API. This has two disadvantages: 1. The ring hom property API fixes the universes of source and target to be the same, hence we unnecessarily lose out on some universe generality. 2. The results for `RingHom`s are proven by translating everything in terms of `Algebra`, so we duplicate the translation steps. This PR refactors `RingHom.FiniteType` to do all locality proofs in the language of `Algebra`s and translate it into the corresponding `RingHom.OfLocalizationSpan{Target}` in the last step. We also streamline some of the translation proofs by unifying the API. --- - [ ] depends on: #22933 [![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$	199/123	Mathlib/RingTheory/FiniteType.lean,Mathlib/RingTheory/LocalProperties/Basic.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/RingHom/Finite.lean,Mathlib/RingTheory/RingHom/FiniteType.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	19-33550 19 days ago	19-33550 19 days ago	0-1219 20 minutes
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	19-24878 19 days ago	19-24878 19 days ago	22-82622 22 days
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	18-82580 18 days ago	18-82580 18 days ago	16-16341 16 days
18444	jjdishere author:jjdishere	feat(Topology/Algebra): Krasner's lemma	This PR defines the class `IsKrasner K L` and `IsKrasnerNorm K L`. And proves that given a complete nontrivially normed/rank-one-valued field, every algebraic normed/valued fields extension L/K satisfies `IsKrasner K L`. However, as the uniqueness extension of norm of such a field is not merged into Mathlib yet, we put this as a condition in the theorem. --- - [x] depends on: #18142 - [x] depends on: #18698 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra t-analysis t-topology t-number-theory merge-conflict WIP label:t-algebra$	440/0	Mathlib.lean,Mathlib/Topology/Algebra/Krasner.lean	2	n/a	['github-actions', 'jjdishere', 'mathlib4-dependent-issues-bot']	nobody	18-69281 18 days ago	unknown	unknown
21266	ADedecker author:ADedecker	feat: restate uniformContinuous_mul in terms of convergence to uniformity	This is convenient when working with [Filter.Tendsto.congr_uniformity](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/UniformSpace/Basic.html#Filter.Tendsto.congr_uniformity) or [Filter.Tendsto.uniformity_trans](https://leanprover-community.github.io/mathlib4_docs/Mathlib/Topology/UniformSpace/Basic.html#Filter.Tendsto.uniformity_trans), for example. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology easy merge-conflict delegated	8/0	Mathlib/Topology/Algebra/UniformGroup/Defs.lean	1	5	['ADedecker', 'github-actions', 'j-loreaux', 'mathlib-bors']	nobody	18-68215 18 days ago	18-68215 18 days ago	0-18788 5 hours
23301	mariainesdff author:mariainesdff	feat(Analysis/Normed/Unbundled/SpectralNorm): add spectral norm	We define the spectral value and the spectral norm. We prove the norm extension theorem [S. Bosch, U. Güntzer, R. Remmert, Non-Archimedean Analysis (Theorem 3.2.1/2)][bosch-guntzer-remmert] : given a nonarchimedean normed field `K` and an algebraic extension `L/K`, the spectral norm is a power-multiplicative `K`-algebra norm on `L` extending the norm on `K`. All `K`-algebra automorphisms of `L` are isometries with respect to this norm. If `L/K` is finite, we get a formula relating the spectral norm on `L` with any other power-multiplicative norm on `L` extending the norm on `K`. As a prerequisite, we formalize the proof of [S. Bosch, U. Güntzer, R. Remmert, Non-Archimedean Analysis (Proposition 3.1.2/1)][bosch-guntzer-remmert]. --- - [ ] depends on: #23184 - [ ] depends on: #23204 - [ ] depends on: #23251 - [ ] depends on: #23252 - [ ] depends on: #23253 - [ ] depends on: #23254 - [ ] depends on: #23266 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-analysis t-number-theory merge-conflict blocked-by-other-PR	1178/3	Mathlib.lean,Mathlib/Algebra/Order/BigOperators/Ring/Finset.lean,Mathlib/Algebra/Order/BigOperators/Ring/Multiset.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Lifts.lean,Mathlib/Algebra/Polynomial/RingDivision.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/Analysis/Normed/Unbundled/AlgNormOfGalois.lean,Mathlib/Analysis/Normed/Unbundled/SpectralNorm.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/List/MinMax.lean,Mathlib/Data/NNReal/Basic.lean,Mathlib/Data/Real/IsNonarchimedean.lean,Mathlib/Data/Real/Pointwise.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.lean,Mathlib/Order/ConditionallyCompleteLattice/Finset.lean,Mathlib/Order/ConditionallyCompleteLattice/Indexed.lean	19	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	18-66253 18 days ago	22-75850 22 days ago	0-1070 17 minutes
7596	alreadydone author:alreadydone	feat: covering maps from properly discontinuous actions and discrete subgroups	--- - [ ] depends on: #23236 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology merge-conflict awaiting-author blocked-by-other-PR	329/41	Mathlib.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/Instances/AddCircle.lean	7	9	['ADedecker', 'alreadydone', 'digama0', 'github-actions', 'mathlib4-dependent-issues-bot', 'tb65536']	ADedecker assignee:ADedecker	18-63944 18 days ago	18-63944 18 days ago	24-5367 24 days
15989	vihdzp author:vihdzp	feat(SetTheory/Ordinal/Principal): golf theorems on additively principal ordinals	We add some new results on additively principal ordinals and use them to simplify existing theorems. --- - [x] depends on: #15990 - [x] depends on: #17740 - [x] depends on: #17741 - [x] depends on: #17742 - [x] depends on: #17842 - [x] depends on: #18902 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory t-logic merge-conflict awaiting-author	64/59	Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Notation.lean,Mathlib/SetTheory/Ordinal/Principal.lean	3	8	['YaelDillies', 'github-actions', 'kbuzzard', 'mathlib4-dependent-issues-bot', 'vihdzp']	nobody	18-16721 18 days ago	18-16721 18 days ago	60-46576 60 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	18-14484 18 days ago	18-14484 18 days 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	18-4247 18 days 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	17-30077 17 days ago	17-30077 17 days ago	0-3019 50 minutes
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$	63/2	Mathlib/Analysis/Normed/Group/AddTorsor.lean,Mathlib/LinearAlgebra/AffineSpace/ContinuousAffineEquiv.lean,Mathlib/Topology/Algebra/ConstMulAction.lean,Mathlib/Topology/Algebra/MulAction.lean	4	4	['eric-wieser', 'github-actions', 'grunweg']	nobody	16-78178 16 days ago	33-15038 1 month ago	0-18122 5 hours
19907	kim-em author:kim-em	chore: remove some 'nonrec'	`nonrec` is nearly always obfuscatory: it tells the reader "this apparent recursive call is not actually, but I'm going to leave you to guess what it is instead", when we could just disambiguate and tell the reader. However I'm not sure I have the patience to go through the remaining 600 uses. (A few are genuinely useful, but I guess less than 10%.)	t-algebra merge-conflict label:t-algebra$	38/38	Mathlib/Algebra/Category/ModuleCat/Differentials/Basic.lean,Mathlib/Algebra/Category/ModuleCat/Differentials/Presheaf.lean,Mathlib/Algebra/CharP/ExpChar.lean,Mathlib/Algebra/ContinuedFractions/Computation/Approximations.lean,Mathlib/Algebra/ContinuedFractions/ConvergentsEquiv.lean,Mathlib/Algebra/DualNumber.lean,Mathlib/Algebra/Quaternion.lean	7	2	['github-actions', 'kim-em']	nobody	16-76850 16 days ago	16-76850 16 days ago	50-75559 50 days
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	16-73883 16 days ago	74-56836 2 months ago	0-0 0 seconds
11768	JovanGerb author:JovanGerb	feat: Interactive Library Rewrite	This PR defines the `rw??` library rewrite tactic that uses my `RefinedDiscrTree`. This is a point&click tactic, letting the user click on subexpressions in the main goal. The results are sorted by relevance, and are separated into sections based on the matched pattern. It comes with a filter button that allows you to switch between the (default) filtered view, with removed duplicate lemmas and not showing lemma names, and the complete view. There is also a section for definitionally unfolding the selected expression - these rewrites do not correspond to a library lemma. --- - [ ] depends on: #11968 - [x] depends on: #12016 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor t-meta merge-conflict blocked-by-other-PR	2788/1253	Mathlib.lean,Mathlib/Lean/GoalsLocation.lean,Mathlib/Lean/Meta/RefinedDiscrTree.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Basic.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Encode.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Initialize.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Lookup.lean,Mathlib/Lean/Meta/RefinedDiscrTree/Pi.lean,Mathlib/Tactic.lean,Mathlib/Tactic/FunProp.lean,Mathlib/Tactic/FunProp/Elab.lean,Mathlib/Tactic/FunProp/StateList.lean,Mathlib/Tactic/FunProp/Theorems.lean,Mathlib/Tactic/FunProp/Types.lean,Mathlib/Tactic/Widget/InteractiveUnfold.lean,Mathlib/Tactic/Widget/LibraryRewrite.lean,Mathlib/Topology/Defs/Basic.lean,MathlibTest/LibraryRewrite.lean,MathlibTest/RefinedDiscrTree.lean,scripts/noshake.json	20	n/a	['JovanGerb', 'eric-wieser', 'fpvandoorn', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	16-71681 16 days ago	unknown	unknown
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	16-66539 16 days ago	16-66567 16 days 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	16-8116 16 days ago	16-8116 16 days ago	0-1769 29 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: #22052 - [ ] depends on: #23635 [![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	15-58518 15 days ago	25-62443 25 days ago	0-0 0 seconds
23383	vlad902 author:vlad902	feat(GroupTheory): finitely generated groups are quotients of free groups on finite generators	This is equivalent to the formulation that finitely generated groups/monoids are quotients of FreeGroups/Monoids over the same generators, though I think the phrasing as a surjective homomorphism is more useful.	t-algebra merge-conflict label:t-algebra$	29/0	Mathlib/GroupTheory/Finiteness.lean	1	1	['github-actions']	nobody	15-45343 15 days ago	15-45343 15 days ago	0-0 0 seconds
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	15-13270 15 days ago	15-13271 15 days 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	14-63838 14 days ago	14-63838 14 days ago	0-214 3 minutes
23499	riccardobrasca author:riccardobrasca	feat: add `RingTheory.MvPowerSeries.rename`	We add `RingTheory.MvPowerSeries.rename` copying the beginning of `RingTheory.MvPolynomial.rename`. --- This is just the beginning of the file, the point of the PR is to see if we want any design changes. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict WIP label:t-algebra$	205/0	Mathlib.lean,Mathlib/RingTheory/MvPowerSeries/Basic.lean,Mathlib/RingTheory/MvPowerSeries/Evaluation.lean,Mathlib/RingTheory/MvPowerSeries/PiTopology.lean,Mathlib/RingTheory/MvPowerSeries/Rename.lean,Mathlib/RingTheory/MvPowerSeries/Substitution.lean	6	14	['AntoineChambert-Loir', 'github-actions', 'riccardobrasca']	nobody	14-56701 14 days ago	14-56701 14 days ago	0-19825 5 hours
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	14-50259 14 days ago	unknown	unknown
21769	JovanGerb author:JovanGerb	feat: extensible `push_neg` tactic	This was started by point (3) of https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Possible.20improvements.20to.20Lean.2FMathlib/near/499085779 To be able to use `push_neg` more generally, this PR reimplements the tactic so that it is extensible. So, users can tag lemmas to be used by `push_neg`. This PR tags lemmas concerning empty/nonempty, subsingleton/nontrivial, and finite/infinite to be used in `push_neg`. Additionally, the tactic is extended to be able to push any constant that you want to push, and `push_neg` is now a macro for `push Not`. So far, I've tried to add lemmas for pushing `Real.log`. I could imagine it could also be used for `Real.exp`, `pow`, `mul`, `smul`, or even `Set.mem`. (the `Set.mem` lemmas are mostly tagged with `@[simp]` already, but `push_mem` could be more readable than `simp` or `dsimp`). Or a combination of pushing `Not` and `Set.compl` could be useful. The implementation is with the `simp` infrastructure, but instead of using post lemmas, like in `simp`, `push` uses `pre` lemmas, so we rewrite each expression before its subterms are rewritten. This is a more efficient way to "push" constants recursively. Most lemmas are added via the `@[push]` attribute, but a few cases require some special handling, so they are implemented "by hand" in a simproc that is tried after the `push` lemmas. For example the simproc simplifies `¬∀ n, p` ⇨ `∃ n, ¬p`, but, this is overridden by the `push` lemma that rewrites `¬(p → q)` ⇨ `p ∧ ¬q` (which doesn't apply at every forall) --- - [ ] depends on: #21965 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-meta merge-conflict blocked-by-other-PR	786/544	Archive/Imo/Imo1988Q6.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2024Q3.lean,Archive/ZagierTwoSquares.lean,Counterexamples/Phillips.lean,Mathlib.lean,Mathlib/Algebra/BigOperators/Finprod.lean,Mathlib/Algebra/BigOperators/Group/Finset/Defs.lean,Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/Group/Action/Defs.lean,Mathlib/Algebra/Group/Basic.lean,Mathlib/Algebra/Group/Defs.lean,Mathlib/Algebra/Group/Pi/Basic.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/GroupWithZero/Action/Defs.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Lie/Weights/Linear.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Order/Antidiag/Nat.lean,Mathlib/Algebra/Order/Archimedean/IndicatorCard.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Ring/Commute.lean,Mathlib/Algebra/Ring/Defs.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/Analysis/Analytic/OfScalars.lean,Mathlib/Analysis/Analytic/Order.lean,Mathlib/Analysis/CStarAlgebra/ContinuousFunctionalCalculus/Order.lean,Mathlib/Analysis/Calculus/FDeriv/Norm.lean,Mathlib/Analysis/Complex/OpenMapping.lean,Mathlib/Analysis/Complex/Polynomial/UnitTrinomial.lean,Mathlib/Analysis/SpecialFunctions/Log/Basic.lean,Mathlib/Analysis/SpecialFunctions/MulExpNegMulSqIntegral.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/Enumerative/DyckWord.lean,Mathlib/Combinatorics/SimpleGraph/Acyclic.lean,Mathlib/Combinatorics/SimpleGraph/Diam.lean,Mathlib/Combinatorics/SimpleGraph/Path.lean,Mathlib/Combinatorics/SimpleGraph/Turan.lean,Mathlib/Computability/AkraBazzi/GrowsPolynomially.lean,Mathlib/Data/Analysis/Filter.lean,Mathlib/Data/ENat/Lattice.lean,Mathlib/Data/Finite/Defs.lean,Mathlib/Data/Finset/Card.lean,Mathlib/Data/Finset/Empty.lean,Mathlib/Data/Finset/Powerset.lean,Mathlib/Data/Finset/SDiff.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Prod.lean,Mathlib/Data/Fintype/Sum.lean,Mathlib/Data/Nat/Defs.lean,Mathlib/Data/Nat/Factorization/PrimePow.lean,Mathlib/Data/Nat/Lattice.lean,Mathlib/Data/Nat/Order/Lemmas.lean,Mathlib/Data/Nat/PrimeFin.lean,Mathlib/Data/Ordmap/Ordset.lean,Mathlib/Data/Real/Archimedean.lean,Mathlib/Data/Set/Basic.lean,Mathlib/Data/Set/Insert.lean,Mathlib/Data/Set/Lattice.lean,Mathlib/Data/Set/Operations.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Dynamics/OmegaLimit.lean,Mathlib/FieldTheory/JacobsonNoether.lean,Mathlib/Geometry/Manifold/ChartedSpace.lean,Mathlib/Geometry/Manifold/PartitionOfUnity.lean,Mathlib/GroupTheory/ArchimedeanDensely.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/Perm/ClosureSwap.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/GroupTheory/SpecificGroups/ZGroup.lean,Mathlib/InformationTheory/Hamming.lean,Mathlib/LinearAlgebra/AffineSpace/AffineSubspace.lean,Mathlib/LinearAlgebra/Eigenspace/Zero.lean,Mathlib/LinearAlgebra/Matrix/SemiringInverse.lean,Mathlib/LinearAlgebra/Multilinear/Basic.lean,Mathlib/LinearAlgebra/Reflection.lean,Mathlib/Logic/IsEmpty.lean,Mathlib/Logic/Nontrivial/Defs.lean,Mathlib/MeasureTheory/Covering/Differentiation.lean,Mathlib/MeasureTheory/Decomposition/Lebesgue.lean,Mathlib/MeasureTheory/Function/ConvergenceInMeasure.lean,Mathlib/MeasureTheory/Function/UniformIntegrable.lean,Mathlib/MeasureTheory/Group/FundamentalDomain.lean,Mathlib/MeasureTheory/Integral/Bochner.lean,Mathlib/MeasureTheory/Integral/Lebesgue.lean,Mathlib/MeasureTheory/Measure/DiracProba.lean,Mathlib/MeasureTheory/Measure/Haar/NormedSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/MeasureSpaceDef.lean,Mathlib/MeasureTheory/Measure/OpenPos.lean,Mathlib/MeasureTheory/Measure/Typeclasses.lean,Mathlib/MeasureTheory/OuterMeasure/Basic.lean,Mathlib/MeasureTheory/SetAlgebra.lean,Mathlib/ModelTheory/Ultraproducts.lean,Mathlib/NumberTheory/AbelSummation.lean,Mathlib/NumberTheory/ArithmeticFunction.lean,Mathlib/NumberTheory/Divisors.lean	149	4	['adomani', 'github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	13-40145 13 days ago	13-40147 13 days ago	5-54179 5 days
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/)	merge-conflict awaiting-author	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	13-39661 13 days ago	13-39661 13 days ago	16-61571 16 days
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	13-39556 13 days ago	13-39556 13 days ago	10-50342 10 days
22027	vihdzp author:vihdzp	chore(SetTheory/Ordinal/FixedPoint); review `Ordinal.nfp` API	This PR does the following: - add `iff` variants of various theorems, renaming some in the process - weaken some assumptions slightly - golf throughout --- - [x] depends on: #22017 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	64/61	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean	2	3	['github-actions', 'grunweg', 'mathlib4-dependent-issues-bot']	nobody	13-39429 13 days ago	16-6389 16 days ago	43-68322 43 days
20689	joelriou author:joelriou	feat(AlgebraicTopology): cylinder objects in model categories	--- - [ ] depends on: #20666 - [ ] depends on: #20680 - [ ] depends on: #20210 [![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	998/6	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/CategoryWithCofibrations.lean,Mathlib/AlgebraicTopology/ModelCategory/Cylinder.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean,Mathlib/AlgebraicTopology/ModelCategory/IsFibrant.lean,Mathlib/CategoryTheory/MorphismProperty/LiftingProperty.lean,Mathlib/CategoryTheory/MorphismProperty/Retract.lean,Mathlib/CategoryTheory/MorphismProperty/RetractArgument.lean,Mathlib/CategoryTheory/MorphismProperty/WeakFactorizationSystem.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	13-35381 13 days ago	68-42453 2 months ago	0-0 0 seconds
15212	victorliu5296 author:victorliu5296	feat: Add fundamental theorem of calculus-2 for Banach spaces	add the Mean Value Theorem for Banach spaces to the library and include reference for the theorem statement This theorem states that if `f : X → Y` is differentiable along the line segment from `a` to `b`, then the change in `f` equals the integral of its derivative along this path. This extends the mean value theorem to Banach spaces. This can be used for the eventual proof of the Newton-Kantorovich theorem with 1 constant contained inside the added reference. Here is the discussion on Zulipchat: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Contributing.20FTC-2.20for.20Banach.20spaces	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	12-85636 12 days ago	12-85636 12 days ago	51-85104 51 days
23177	faenuccio author:faenuccio	feat: add order properties to WithZero types	We add some order properties (mainly some `lt`) for types of the form `WithZero α`. Co-authored-by: María Inés de Frutos Fernández	large-import t-order merge-conflict WIP	65/18	Mathlib/Algebra/GroupWithZero/Int.lean,Mathlib/Algebra/GroupWithZero/WithZero.lean,Mathlib/Algebra/Order/Group/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/Algebra/Order/GroupWithZero/Unbundled.lean,Mathlib/Algebra/Order/Monoid/Unbundled/Pow.lean	6	43	['Vierkantor', 'YaelDillies', 'faenuccio', 'github-actions']	nobody	12-71661 12 days ago	12-71661 12 days ago	5-22106 5 days
22966	alreadydone author:alreadydone	feat(RingTheory): rank of rational function field extension	+ `IsAlgebraic/IsIntegral R S` + `IsPushout R S R' S'` ⇒ `IsAlgebraic/IsIntegral R' S'` (for the "IsAlgebraic" version we currently need to assume `NoZeroDivisor R'` and `FaithfulSMul R R'` (i.e. `Injective (algebraMap R R')`) + `IsAlgebraic R S` + `IsFractionRing R R'` + `IsFractionRing S S'` ⇒ `IsPushout R S R' S'` (need to assume `FaithfulSMul R S` + `NonZeroDivisors S`) As consequences, we have `rank (f R) (f S) = rank R S` for `f = FractionRing (Polynomial ·)` or `FractionRing (MvPolynomial _ ·)` assuming `IsAlgebraic R S` + `IsDomain S` + `FaithfulSMul R S`. (For `f = Polynomial` or `MvPolynomial _`, `NoZeroDivisors R` is enough by #23095.) --- - [x] depends on: #23095 - [x] depends on: #23096 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	270/46	Mathlib/RingTheory/AdjoinRoot.lean,Mathlib/RingTheory/Algebraic/Basic.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/TensorProduct/Basic.lean	5	10	['Louddy', 'alreadydone', 'github-actions', 'leanprover-bot', 'mathlib4-dependent-issues-bot']	nobody	12-46845 12 days ago	12-46845 12 days ago	14-3730 14 days
22806	vlad902 author:vlad902	feat: add `(0 : ℝ) ≤ 1` `Fact` instance	With the condition that `a ≤ b`, a number of useful instances can be automatically generated for the type `Set.Icc a b`. unitInterval is an alias for `Set.Icc 0 1`, and having this fact be declared allows all of these instances to be automatically generated, instead of just the BoundedOrder instance for unitInterval.	new-contributor t-topology merge-conflict	2/1	Mathlib/Topology/UnitInterval.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'vlad902']	nobody	12-44223 12 days ago	12-44223 12 days ago	0-0 0 seconds
13861	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`. 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 do some light refactoring for succinctness, and put this any related preexisting lemmas in a new file to not trigger the linter. Needed by #12664 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data merge-conflict	204/62	Mathlib.lean,Mathlib/Algebra/Category/MonCat/Adjunctions.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/Data/Finsupp/Option.lean,Mathlib/Data/Finsupp/Single.lean,Mathlib/LinearAlgebra/Finsupp/LinearCombination.lean	6	1	['github-actions']	nobody	12-38014 12 days ago	12-38014 12 days ago	12-6613 12 days
21858	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 function 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. --- - [ ] depends on: #21860 - [ ] depends on: #21970 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-set-theory merge-conflict	216/262	Mathlib/Logic/Equiv/List.lean,Mathlib/SetTheory/Cardinal/Cofinality.lean,Mathlib/SetTheory/Ordinal/Enum.lean,Mathlib/SetTheory/Ordinal/FixedPoint.lean,Mathlib/SetTheory/Ordinal/Principal.lean,Mathlib/SetTheory/Ordinal/Veblen.lean	6	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	12-37476 12 days ago	12-37478 12 days ago	0-1601 26 minutes
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	12-35191 12 days ago	12-35191 12 days 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	12-3496 12 days ago	12-3497 12 days ago	0-0 0 seconds
23536	xroblot author:xroblot	feat(NumberField/IsCM): define the complex conjugation of a CM-extension	--- - [ ] depends on: #23533 [![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	257/2	Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	4	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-74615 11 days ago	11-74617 11 days ago	0-1223 20 minutes
23674	xroblot author:xroblot	feat(NumberField/IsCM): first results about the action of `complexConjugation` on units	--- - [ ] depends on: #23536 - [ ] depends on: #23453 - [ ] depends on: #23684 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict blocked-by-other-PR	483/83	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/RingTheory/SimpleRing/Field.lean	21	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-74493 11 days ago	11-74495 11 days ago	0-703 11 minutes
23696	xroblot author:xroblot	feat(NumberField/IsCM): compute ratio of regulators	--- - [ ] depends on: #23694 - [ ] depends on: #23374 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict blocked-by-other-PR	1115/142	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/RingTheory/SimpleRing/Field.lean,Mathlib/Topology/Homeomorph/Lemmas.lean	33	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-74491 11 days ago	11-74492 11 days ago	0-508 8 minutes
23694	xroblot author:xroblot	feat(NumberField/IsCM): compute the index of the subgroup of real units	--- - [ ] depends on: #23674 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-number-theory merge-conflict blocked-by-other-PR	626/83	Mathlib/Algebra/Field/Equiv.lean,Mathlib/Algebra/Group/Invertible/Basic.lean,Mathlib/Algebra/Polynomial/Splits.lean,Mathlib/AlgebraicGeometry/Morphisms/Proper.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/LinearDisjoint.lean,Mathlib/FieldTheory/Normal/Basic.lean,Mathlib/GroupTheory/GroupAction/FixedPoints.lean,Mathlib/GroupTheory/Index.lean,Mathlib/GroupTheory/SpecificGroups/Cyclic.lean,Mathlib/LinearAlgebra/Dimension/Localization.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/RingTheory/Artinian/Ring.lean,Mathlib/RingTheory/IntegralClosure/Algebra/Defs.lean,Mathlib/RingTheory/IntegralClosure/IsIntegralClosure/Basic.lean,Mathlib/RingTheory/LinearDisjoint.lean,Mathlib/RingTheory/Localization/FractionRing.lean,Mathlib/RingTheory/Localization/Integral.lean,Mathlib/RingTheory/RootsOfUnity/Complex.lean,Mathlib/RingTheory/SimpleRing/Field.lean	23	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	11-74491 11 days ago	11-74494 11 days ago	0-637 10 minutes
19695	Timeroot author:Timeroot	feat(ModelTheory): Set.Definable is transitive	Upstreamed from the [EquationalTheories](https://github.com/teorth/equational_theories) project. The main new theorem in this PR is `Set.Definable_trans`, which is that definability of sets in first order logic is transitive. The other work (in Syntax/Semantics) is pretty much all to facilitate that statement and proof. --- - [x] depends on: #19618 - [x] depends on: #23501 - [ ] depends on: #23502 - [ ] depends on: #23504 - [ ] depends on: #23506	large-import t-logic merge-conflict blocked-by-other-PR	557/6	Mathlib/Data/Rel.lean,Mathlib/ModelTheory/Definability.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/ModelTheory/Syntax.lean,scripts/noshake.json	5	36	['Timeroot', 'awainverse', 'github-actions', 'madvorak', 'mathlib4-dependent-issues-bot']	nobody	11-61645 11 days ago	11-61647 11 days ago	34-66547 34 days
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	11-17608 11 days ago	11-17611 11 days 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	11-9709 11 days ago	11-9711 11 days 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	10-81905 10 days ago	11-15074 11 days ago	10-21608 10 days
4197	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 --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-topology t-category-theory merge-conflict WIP	38380/351	Mathlib.lean,Mathlib/Algebra/Category/ModuleCat/Free.lean,Mathlib/Algebra/Homology/Additive.lean,Mathlib/Algebra/Homology/BicomplexColumns.lean,Mathlib/Algebra/Homology/BicomplexRows.lean,Mathlib/Algebra/Homology/CategoryWithHomology.lean,Mathlib/Algebra/Homology/CochainComplexMinus.lean,Mathlib/Algebra/Homology/ComplexShape.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/ConnectShortExact.lean,Mathlib/Algebra/Homology/DerivedCategory/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/DerivabilityStructureInjectives.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Basic.lean,Mathlib/Algebra/Homology/DerivedCategory/Ext/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Fractions.lean,Mathlib/Algebra/Homology/DerivedCategory/HomologySequence.lean,Mathlib/Algebra/Homology/DerivedCategory/Linear.lean,Mathlib/Algebra/Homology/DerivedCategory/Minus.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/Embedding/Basic.lean,Mathlib/Algebra/Homology/Embedding/CochainComplex.lean,Mathlib/Algebra/Homology/Embedding/ComplementaryTrunc.lean,Mathlib/Algebra/Homology/Embedding/Extend.lean,Mathlib/Algebra/Homology/Embedding/ExtendHomology.lean,Mathlib/Algebra/Homology/Embedding/ExtendMap.lean,Mathlib/Algebra/Homology/Embedding/HomEquiv.lean,Mathlib/Algebra/Homology/Embedding/IsSupported.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/TruncGEHomology.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/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/Plus.lean,Mathlib/Algebra/Homology/HomotopyCategory/Shift.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/LeftResolution/Basic.lean,Mathlib/Algebra/Homology/LeftResolution/DerivabilityStructure.lean,Mathlib/Algebra/Homology/Opposite.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/Homology.lean,Mathlib/Algebra/Homology/ShortComplex/Images.lean,Mathlib/Algebra/Homology/ShortComplex/Preadditive.lean,Mathlib/Algebra/Homology/ShortComplex/PreservesHomology.lean,Mathlib/Algebra/Homology/ShortComplex/Refinements.lean,Mathlib/Algebra/Homology/ShortComplex/RightHomology.lean,Mathlib/Algebra/Homology/ShortComplex/ShortComplexFive.lean,Mathlib/Algebra/Homology/ShortComplex/ShortComplexFour.lean,Mathlib/Algebra/Homology/ShortComplex/ULift.lean,Mathlib/Algebra/Homology/Single.lean,Mathlib/Algebra/Homology/SpectralObject/Basic.lean,Mathlib/Algebra/Homology/SpectralObject/Convergence.lean,Mathlib/Algebra/Homology/SpectralObject/Differentials.lean,Mathlib/Algebra/Homology/SpectralObject/FirstPage.lean,Mathlib/Algebra/Homology/SpectralObject/Homology.lean,Mathlib/Algebra/Homology/SpectralObject/Images.lean,Mathlib/Algebra/Homology/SpectralObject/Misc.lean,Mathlib/Algebra/Homology/SpectralObject/PageInfinity.lean,Mathlib/Algebra/Homology/SpectralObject/SpectralSequence.lean,Mathlib/Algebra/Homology/SpectralSequence/Basic.lean,Mathlib/Algebra/Homology/SpectralSequence/Convergence.lean,Mathlib/Algebra/Homology/SpectralSequence/Examples/Grothendieck.lean,Mathlib/Algebra/Homology/SpectralSequence/Examples/OfTStructure.lean	235	n/a	['digama0', 'github-actions', 'jcommelin']	nobody	10-79235 10 days ago	unknown	unknown
23831	vasnesterov author:vasnesterov	feat(Analysis): binomial series convergence	Prove * `one_add_cpow_hasFPowerSeriesOnBall_zero`: for complex `a` and `\|x\| < 1`, the binomial series converges to `(1 + x).cpow a`. * `one_add_rpow_hasFPowerSeriesOnBall_zero`: the variant of the above for reals. --- - [ ] depends on: #22538 - [ ] depends on: #23749 - [ ] depends on: #23790 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict blocked-by-other-PR	606/6	Mathlib.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Analytic/Binomial.lean,Mathlib/Analysis/Analytic/ChangeOrigin.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Defs.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/NormedSpace/Connected.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/RingTheory/Binomial.lean,scripts/noshake.json	12	2	['leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	10-62290 10 days ago	10-62291 10 days ago	0-822 13 minutes
21847	smmercuri author:smmercuri	feat: `v.adicCompletionIntegers K` is compact	--- - [ ] depends on: #21844 [![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	459/4	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/UniformRing.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	10-41735 10 days ago	10-41737 10 days ago	0-0 0 seconds
21573	lambda-fairy author:lambda-fairy	feat(Computability): regular languages are closed under reversal	This PR proves that regular languages are closed under reversal. It works by reversing the transitions in the NFA, and proving that the resulting automaton matches the reversed language. The argument proceeds by induction on the input word, ensuring that, at each character, the state sets for the forward and reverse automaton correspond to each other. I also clean up the existing NFA module, which includes making the `M` argument implicit by default. I can revert that if it's controversial. Thank you @Rob23oba for their help with the induction proof. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-computability merge-conflict	75/7	Mathlib/Computability/NFA.lean	1	8	['github-actions', 'lambda-fairy', 'madvorak', 'meithecatte', 'tristan-f-r']	nobody	10-31535 10 days ago	44-73786 1 month ago	24-86139 24 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	10-6139 10 days ago	10-6141 10 days ago	12-18679 12 days
18486	vasnesterov author:vasnesterov	feat(Tactic): tactic for computing asymptotics of real functions	It's an auxiliary PR which implements the entire `compute_asymptotics` tactic. It will be split into multiple small PRs. --- 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) and powers with constant real exponent. ```lean example : let f := fun (x : ℝ) ↦ (4 x)/(3 + 2 * x); Tendsto f atTop (nhds 2) := by simp only compute_asymptotics example : let f := fun (x : ℝ) ↦ x^(1/2 : ℝ) / (x^(1/3 : ℝ) + x^(-1/3 : ℝ) + 18); Tendsto f atTop atTop := by simp only compute_asymptotics ``` It also supports non-numerical constants: ```lean example (a : ℝ) (h : 0 < a) : let f := fun (x : ℝ) ↦ a * x; Tendsto f atTop atTop := by simp only compute_asymptotics example : let f := fun (x : ℝ) ↦ Real.pi * x; Tendsto f atTop atTop := by simp only have : 0 < Real.pi := Real.pi_pos compute_asymptotics ``` (for more examples see `compute_asymptotics.lean` in tests) ### Isn't it undecidable? In general, finding the limit of a given function is undecidable problem, due to undecidability of the problem of comparing real numbers. So far I use `linarith` tactic for this under the hood. When it's unable to prove neither of `x < y`, `y < x`, `x = y`, the tactic fails. ### TODO * Prove the goals of the form `f =o[l] g` and similarly for other O-notations. * Add `sin`, `cos`, `exp`, and `log` support. ### 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. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-meta merge-conflict WIP	11886/331	Mathlib.lean,Mathlib/Analysis/Calculus/FDeriv/Analytic.lean,Mathlib/Analysis/Calculus/FormalMultilinearSeries.lean,Mathlib/Data/Seq/Parallel.lean,Mathlib/Data/Seq/Seq.lean,Mathlib/Data/Set/Pointwise/Interval.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Tendsto/Lemmas.lean,Mathlib/Tactic/Tendsto/Main.lean,Mathlib/Tactic/Tendsto/Meta/CompareReal.lean,Mathlib/Tactic/Tendsto/Meta/ConstSimp.lean,Mathlib/Tactic/Tendsto/Meta/Defs.lean,Mathlib/Tactic/Tendsto/Meta/ElimDestruct.lean,Mathlib/Tactic/Tendsto/Meta/LeadingTerm.lean,Mathlib/Tactic/Tendsto/Meta/MS.lean,Mathlib/Tactic/Tendsto/Meta/Main.lean,Mathlib/Tactic/Tendsto/Meta/Trimming.lean,Mathlib/Tactic/Tendsto/Multiseries.lean,Mathlib/Tactic/Tendsto/Multiseries/Basic.lean,Mathlib/Tactic/Tendsto/Multiseries/Basis.lean,Mathlib/Tactic/Tendsto/Multiseries/Defs.lean,Mathlib/Tactic/Tendsto/Multiseries/LeadingTerm.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Add.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Basic.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/ForPow.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Inv.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Merge.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Mul.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Pow.lean,Mathlib/Tactic/Tendsto/Multiseries/Operations/Powser.lean,Mathlib/Tactic/Tendsto/Multiseries/Term.lean,Mathlib/Tactic/Tendsto/Multiseries/Trimming.lean,Mathlib/Topology/Algebra/Order/Field.lean,MathlibTest/compute_asymptotics.lean,MathlibTest/kek.lean	36	54	['github-actions']	nobody	9-81494 9 days ago	130-1820 4 months ago	0-0 0 seconds
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	9-72045 9 days ago	9-72046 9 days 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	9-71556 9 days ago	9-71558 9 days 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	9-67824 9 days ago	9-67825 9 days 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	9-67822 9 days ago	9-67824 9 days ago	43-83249 43 days
22319	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Sections Right Adjoint)	we define the `Over.sections` functor in the file `CategoryTheory.Comma.Over.Sections` and prove that it is a right adjoint to the `Over.star`, thereby solving an existing TODO in `Over.pullback` file. The `sections` functor is used to define the right adjoint to the pullback functor `Over.pullback` in the development of LCCCs. Moreover, the rest of added lemmas and theorems to `CategoryTheory.Comma.Over.Pullback` are crucial for the development of LCCCs in the next PR. --- - [ ] depends on: #21525 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	9-67295 9 days ago	9-67297 9 days ago	0-2084 34 minutes
22321	sinhp author:sinhp	feat(CategoryTheory): Locally Cartesian Closed Categories (Definition)	This PR defines locally cartesian closed categories in terms of existence of the pushforward functors (right adjoint to the pullback functor) for all morphisms. We develop basic API and prove the following: 1. Existence of the pushforward functors is equivalent to cartesian closed slices. 2. Any locally cartesian closed category with a terminal object is cartesian closed. 3. The slices of a locally cartesian closed category are locally cartesian closed. Some of the content is based on the project of formalization of polynomial functors at the Trimester "Prospect of Formal Mathematics" at the Hausdorff Institute (HIM) in Bonn. https://github.com/sinhp/Poly I found this implementation of locally cartesian closed categories amenable to polynomial functors formalization. Co-authored-by: Emily Riehl --- - [ ] depends on: #21525 - [ ] depends on: #22319 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	9-67295 9 days ago	9-67296 9 days ago	0-336 5 minutes
23714	urkud author:urkud	chore(Measure): drop some assumptions	Add `prod_apply_le`/`prod_prod_le` and use them to drop `SFinite _` assumptions here and there. --- I pushed too much to this branch. I'll split it into PRs before removing `awaiting-author`. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict awaiting-author	157/74	Mathlib/MeasureTheory/Integral/Prod.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/MeasureTheory/Measure/QuasiMeasurePreserving.lean	3	3	['github-actions', 'leanprover-community-bot-assistant']	nobody	9-66798 9 days ago	9-66800 9 days ago	0-17283 4 hours
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	9-12260 9 days ago	9-12262 9 days ago	0-0 0 seconds
21673	erdOne author:erdOne	feat: `∑ z ∈ L, ‖z - x‖⁻ʳ` converges for lattices `L`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict	329/0	Mathlib.lean,Mathlib/Algebra/BigOperators/Group/Finset/Disjoint.lean,Mathlib/Algebra/Module/ZLattice/Summable.lean,Mathlib/Order/Disjointed.lean	4	4	['github-actions', 'leanprover-community-bot-assistant', 'xroblot']	nobody	9-8820 9 days ago	9-8822 9 days ago	27-73279 27 days
23312	xroblot author:xroblot	feat(NumberField/Units): prove that a family of units is of max rank iff its closure has finite index	Let `u : Fin (rank K) → (𝓞 K)ˣ` be a family of units of a number field `K`. We prove that `isMaxRank u`, that is its regulator is nonzero, iff `closure (Set.range u))` has finite index. --- - [ ] depends on: #22882 - [ ] depends on: #23063 [![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	266/58	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/Topology/Homeomorph/Lemmas.lean	8	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	9-8348 9 days ago	9-8349 9 days ago	0-963 16 minutes
23374	xroblot author:xroblot	feat(NumberField/Units): compute index of unit subgroups using regulators	--- - [ ] depends on: #23312 - [ ] depends on: #22961 [![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	413/59	Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/GroupTheory/Index.lean,Mathlib/LinearAlgebra/Determinant.lean,Mathlib/LinearAlgebra/Dimension/Finite.lean,Mathlib/LinearAlgebra/FreeModule/Finite/Quotient.lean,Mathlib/LinearAlgebra/Matrix/Determinant/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/NumberTheory/NumberField/Units/Regulator.lean,Mathlib/Topology/Homeomorph/Lemmas.lean	11	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	9-8223 9 days ago	9-8225 9 days ago	0-177 2 minutes
23670	Vierkantor author:Vierkantor	feat(Tactic/Linter): one option for all Mathlib linters	This is intended to make downstream projects easier to maintain and keep up to Mathlib standards, by having one option `linter.mathlibStandard` control all the linters that we previously had to enable one by one in the lakefile. This is accomplished by introducing a new check `Mathlib.getLinterValue` that takes the `linter.mathlibStandard` option into account. If that option is set to true, it checks if this is one of the Mathlib standard linters, and enables the linter if so. I also considered a few ways of implementing this feature by setting options automatically. But I couldn't get any to work without modifying Lean itself: * an `initialize` command doesn't get access to the options in the current file (since it runs in IO rather than CoreM), * hooking the `runLinters` step of elaboration doesn't work because each linter restores the state (including options) after running. A drawback of the current approach is that a linter defined upstream of Mathlib cannot be enabled this way. There is no such linter currently, and we can fall back to the previous `lakefile` approach if that happens. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-linter merge-conflict	135/47	Mathlib.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter/Attr.lean,Mathlib/Tactic/Linter/DeprecatedSyntaxLinter.lean,Mathlib/Tactic/Linter/DirectoryDependency.lean,Mathlib/Tactic/Linter/DocPrime.lean,Mathlib/Tactic/Linter/DocString.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,MathlibTest/MathlibStandardLints.lean,lakefile.lean,scripts/lint-style.lean	22	4	['Vierkantor', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	9-8098 9 days ago	9-8100 9 days ago	5-52291 5 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	8-80356 8 days ago	8-80358 8 days 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	8-70552 8 days ago	8-70552 8 days ago	55-53553 55 days
21162	smmercuri author:smmercuri	feat: add `Valued.WithZeroMulInt.tendsto_zero_pow_of_le_neg_one` and applications to `adicCompletion K v`	If `K` is a valued ring taking values in the multiplicative integers wth a zero adjoined, then `Valued.WithZeroMulInt.tendsto_zero_pow_of_le_neg_one` is the result that `x ^ n` tends to zero in this ring if `v x` is at most `-1` valued. As a result, in `adicCompletion K v`, we can always find a non-zero divisor that is arbitrarily small across a finite number of `v` (`AdicCompletion.exists_nonZeroDivisor_finset_valued_lt`). --- - [x] depends on: #21160 - [x] depends on: #22055 [![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$	112/0	Mathlib.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	3	7	['YaelDillies', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	8-51294 8 days ago	8-51296 8 days ago	58-63286 58 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	8-4161 8 days ago	8-7684 8 days 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	7-65017 7 days ago	7-65019 7 days ago	1-44375 1 day
22059	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 - [ ] depends on: #22137 - [ ] depends on: #22642 (and a similar result for direct sums), still WIP - [ ] depends on #23040 for the mathlib-level definition of smooth immersions and embeddings [![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	603/0	Mathlib.lean,Mathlib/Geometry/Manifold/HasSmoothBoundary.lean	2	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	7-63271 7 days ago	7-63273 7 days ago	0-0 0 seconds
7873	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'MichaelStollBayreuth', 'github-actions', 'kim-em', 'leanprover-bot', 'leanprover-community-mathlib4-bot', 'mattrobball']	nobody	7-44393 7 days ago	277-26326 9 months ago	7-77799 7 days
23921	alreadydone author:alreadydone	Jyxu/projective trace	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	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	6-45341 6 days ago	6-45343 6 days ago	0-0 0 seconds
23867	kim-em author:kim-em	chore: remove unnecessary `[AtLeastTwo n]` hypotheses	This PR is a follow-up to #23866, demonstrating that we can remove nearly all the `[AtLeastTwo n]` hypotheses across Mathlib.	bench-after-CI merge-conflict	272/278	Mathlib/Algebra/AddConstMap/Basic.lean,Mathlib/Algebra/CharP/Defs.lean,Mathlib/Algebra/CharP/Invertible.lean,Mathlib/Algebra/DirectSum/Internal.lean,Mathlib/Algebra/DirectSum/Ring.lean,Mathlib/Algebra/Group/Hom/End.lean,Mathlib/Algebra/Group/Opposite.lean,Mathlib/Algebra/Group/ULift.lean,Mathlib/Algebra/Module/LinearMap/End.lean,Mathlib/Algebra/Module/NatInt.lean,Mathlib/Algebra/MonoidAlgebra/ToDirectSum.lean,Mathlib/Algebra/Order/Floor/Ring.lean,Mathlib/Algebra/Order/Floor/Semiring.lean,Mathlib/Algebra/Order/Kleene.lean,Mathlib/Algebra/Order/Monoid/Unbundled/WithTop.lean,Mathlib/Algebra/Order/Round.lean,Mathlib/Algebra/Order/SuccPred/WithBot.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Algebra/Polynomial/Coeff.lean,Mathlib/Algebra/Polynomial/Degree/Definitions.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Quaternion.lean,Mathlib/Algebra/Ring/Center.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/Complex/Basic.lean,Mathlib/Analysis/Normed/Group/Basic.lean,Mathlib/Analysis/RCLike/Basic.lean,Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean,Mathlib/Analysis/SpecialFunctions/Complex/Log.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Pow/Complex.lean,Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean,Mathlib/Data/Complex/Basic.lean,Mathlib/Data/Complex/Norm.lean,Mathlib/Data/ENNReal/Basic.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/Data/ENat/Basic.lean,Mathlib/Data/Int/Log.lean,Mathlib/Data/Matrix/ConjTranspose.lean,Mathlib/Data/Matrix/Diagonal.lean,Mathlib/Data/Matrix/Kronecker.lean,Mathlib/Data/Matrix/Mul.lean,Mathlib/Data/Matrix/Notation.lean,Mathlib/Data/NNRat/Defs.lean,Mathlib/Data/NNReal/Defs.lean,Mathlib/Data/Nat/Cast/Basic.lean,Mathlib/Data/Nat/Cast/Commute.lean,Mathlib/Data/Nat/Cast/Defs.lean,Mathlib/Data/Nat/Cast/Order/Basic.lean,Mathlib/Data/Nat/Cast/Order/Ring.lean,Mathlib/Data/Nat/Cast/Prod.lean,Mathlib/Data/Nat/Cast/Synonym.lean,Mathlib/Data/Nat/PartENat.lean,Mathlib/Data/Rat/Lemmas.lean,Mathlib/Data/Real/Hyperreal.lean,Mathlib/Data/Real/Irrational.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/Data/ZMod/IntUnitsPower.lean,Mathlib/Geometry/Manifold/IsManifold/Basic.lean,Mathlib/Geometry/Manifold/VectorField/Pullback.lean,Mathlib/LinearAlgebra/Dimension/Finrank.lean,Mathlib/LinearAlgebra/Matrix/PosDef.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/NumberTheory/Padics/PadicNumbers.lean,Mathlib/NumberTheory/Zsqrtd/Basic.lean,Mathlib/Order/Filter/Germ/Basic.lean,Mathlib/RingTheory/Multiplicity.lean,Mathlib/SetTheory/Cardinal/Aleph.lean,Mathlib/SetTheory/Cardinal/Basic.lean,Mathlib/SetTheory/Cardinal/Continuum.lean,Mathlib/SetTheory/Cardinal/ENat.lean,Mathlib/SetTheory/Cardinal/Order.lean,Mathlib/SetTheory/Cardinal/ToNat.lean,Mathlib/SetTheory/Game/Birthday.lean,Mathlib/SetTheory/Game/Short.lean,Mathlib/SetTheory/Ordinal/Arithmetic.lean,Mathlib/SetTheory/Ordinal/Basic.lean,Mathlib/Tactic/ENatToNat.lean,Mathlib/Topology/Algebra/Module/LinearMap.lean,Mathlib/Topology/Algebra/SeparationQuotient/Basic.lean,Mathlib/Topology/ContinuousMap/Bounded/Normed.lean,Mathlib/Topology/Instances/ENNReal/Lemmas.lean	86	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	6-11394 6 days ago	6-11396 6 days ago	3-60152 3 days
22341	chrisflav author:chrisflav	feat(RingTheory): formulas for `Module.rankAtStalk` for various constructions	Compute `Module.rankAtStalk` for base change and products. Relate it to being trivial and to the dimension of the fiber. --- - [ ] depends on: #22339 - [ ] depends on: #22336 - [ ] depends on: #22328 [![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$	314/8	Mathlib.lean,Mathlib/Algebra/Module/LocalizedModule/Basic.lean,Mathlib/LinearAlgebra/TensorProduct/Pi.lean,Mathlib/RingTheory/IsBaseChangePi.lean,Mathlib/RingTheory/Localization/BaseChange.lean,Mathlib/RingTheory/Localization/Module.lean,Mathlib/RingTheory/Smooth/Locus.lean,Mathlib/RingTheory/Spectrum/Prime/Basic.lean,Mathlib/RingTheory/Spectrum/Prime/FreeLocus.lean,Mathlib/RingTheory/Spectrum/Prime/RingHom.lean	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	5-82165 5 days ago	5-82167 5 days ago	0-1680 28 minutes
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	28	['YaelDillies', 'eric-wieser', 'girving', 'github-actions', 'j-loreaux', 'kbuzzard', 'leanprover-community-bot-assistant', 'urkud']	nobody	5-55729 5 days ago	5-55730 5 days ago	29-60989 29 days
24004	alreadydone author:alreadydone	chore(RingTheory): equivalence between algebraicity over `IntermediateField.adjoin` and `Algebra.adjoin`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-algebra merge-conflict label:t-algebra$	206/25	Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Module/RingHom.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Algebra.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Defs.lean,Mathlib/GroupTheory/GroupAction/SubMulAction.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/AlgebraicIndependent/AlgebraicClosure.lean,Mathlib/RingTheory/Localization/FractionRing.lean,lake-packages/Cli,lake-packages/Qq,lake-packages/aesop,lake-packages/proofwidgets,lake-packages/std	14	5	['alreadydone', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'leanprover-community-mathlib4-bot']	nobody	5-53399 5 days ago	5-53399 5 days ago	0-2231 37 minutes
22760	adomani author:adomani	feat: linting the start of declarations and commands	This linter checks that * each command starts at the beginning of a line; * the "hypotheses segment" of each declaration coincides with its pretty-printed version. This is likely to have still false positives, but maybe it is acceptable! --- [![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	318/6	Mathlib.lean,Mathlib/Algebra/Order/Ring/Abs.lean,Mathlib/CategoryTheory/Monoidal/Functor.lean,Mathlib/Data/UInt.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/Basic.lean,Mathlib/MeasureTheory/Integral/TorusIntegral.lean,Mathlib/Probability/ConditionalProbability.lean,Mathlib/RingTheory/Algebraic/Integral.lean,Mathlib/RingTheory/HahnSeries/Multiplication.lean,Mathlib/Tactic.lean,Mathlib/Tactic/Linter.lean,Mathlib/Tactic/Linter/CommandStart.lean,Mathlib/Topology/Algebra/UniformField.lean,MathlibTest/CommandStart.lean	14	22	['adomani', 'github-actions', 'grunweg', 'leanprover-community-bot-assistant']	nobody	5-46179 5 days ago	5-46181 5 days ago	0-5078 1 hour
23489	plp127 author:plp127	chore: fix recursors	Replace motive with `motive` and other improvements. Will probably split this PR after fixing is done. 4057 recursors left --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict WIP	4245/162	Mathlib/Algebra/EuclideanDomain/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Free.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/AlgebraicTopology/SimplexCategory/GeneratorsRelations/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/SubboxInduction.lean,Mathlib/CategoryTheory/Quotient.lean,Mathlib/Computability/TuringMachine.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/Finset/Insert.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finsupp/Single.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/Quot.lean,Mathlib/Data/Sym/Sym2.lean,Mathlib/GroupTheory/Congruence/Defs.lean,Mathlib/GroupTheory/Coset/Defs.lean,Mathlib/GroupTheory/Coxeter/Basic.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/LinearAlgebra/TensorProduct/Tower.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaEven.lean,Mathlib/NumberTheory/LSeries/HurwitzZetaOdd.lean,Mathlib/RingTheory/AdicCompletion/Basic.lean,Mathlib/RingTheory/MvPolynomial/Symmetric/FundamentalTheorem.lean,Mathlib/SetTheory/Cardinal/Defs.lean,Mathlib/SetTheory/PGame/Algebra.lean,print.lean,working.csv	40	1	['github-actions']	nobody	4-78306 4 days ago	12-38610 12 days ago	0-0 0 seconds
23966	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	4-61377 4 days ago	7-7836 7 days ago *	0-0 0 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	4-61255 4 days ago	unknown	unknown
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	4-6388 4 days ago	4-6390 4 days ago	55-52030 55 days
23211	Parcly-Taxel author:Parcly-Taxel	chore: automatically deprime common `induction'` uses	Replace `induction'` with `induction` for the following targets: ```python rep_dict = {("Nat", "~", 2): [("zero", 0), ("succ", 2)], ("Nat", "strong_induction_on", 1): [("h", 2)], ("Nat", "case_strong_induction_on", 2): [("hz", 0), ("hi", 2)], ("Nat", "le_induction", 2): [("base", 0), ("succ", 3)], ("List", "~", 2): [("nil", 0), ("cons", 3)], ("List", "reverseRecOn", 2): [("nil", 0), ("append_singleton", 3)], ("Multiset", "induction_on", 2): [("empty", 0), ("cons", 3)], ("Finset", "induction", 2): [("empty", 0), ("@insert", 4)], ("Finset", "induction_on", 2): [("empty", 0), ("@insert", 4)], ("MvPolynomial", "induction_on'", 2): [("monomial", 2), ("add", 4)], ("MvPolynomial", "induction_on", 3): [("C", 1), ("add", 4), ("mul_X", 3)]} ``` The script and the data file used can be found [here](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/The.20plan.20to.20remove.20induction'/near/508218834).	tech debt merge-conflict	2189/1565	Archive/Imo/Imo1977Q6.lean,Archive/Imo/Imo2006Q5.lean,Archive/Imo/Imo2013Q1.lean,Archive/Imo/Imo2013Q5.lean,Archive/Imo/Imo2019Q4.lean,Archive/Imo/Imo2024Q1.lean,Archive/MiuLanguage/DecisionSuf.lean,Archive/Sensitivity.lean,Archive/Wiedijk100Theorems/FriendshipGraphs.lean,Archive/Wiedijk100Theorems/Partition.lean,Mathlib/Algebra/Algebra/Subalgebra/Lattice.lean,Mathlib/Algebra/BigOperators/Group/List/Lemmas.lean,Mathlib/Algebra/Group/Conj.lean,Mathlib/Algebra/Group/ForwardDiff.lean,Mathlib/Algebra/Group/Pointwise/Finset/Basic.lean,Mathlib/Algebra/Group/Pointwise/Set/BigOperators.lean,Mathlib/Algebra/Group/Pointwise/Set/Finite.lean,Mathlib/Algebra/Group/Pointwise/Set/ListOfFn.lean,Mathlib/Algebra/Lie/Solvable.lean,Mathlib/Algebra/Module/PID.lean,Mathlib/Algebra/Order/BigOperators/Group/List.lean,Mathlib/Algebra/Order/CauSeq/BigOperators.lean,Mathlib/Algebra/Order/Group/Multiset.lean,Mathlib/Algebra/Polynomial/BigOperators.lean,Mathlib/Algebra/Polynomial/Degree/Lemmas.lean,Mathlib/Algebra/Polynomial/Derivative.lean,Mathlib/Algebra/Polynomial/EraseLead.lean,Mathlib/Algebra/Polynomial/Eval/Defs.lean,Mathlib/Algebra/Polynomial/HasseDeriv.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Tropical/BigOperators.lean,Mathlib/AlgebraicTopology/DoldKan/Decomposition.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/AlgebraicTopology/DoldKan/Projections.lean,Mathlib/Analysis/Analytic/Composition.lean,Mathlib/Analysis/Analytic/Constructions.lean,Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/BoxIntegral/Partition/Split.lean,Mathlib/Analysis/CStarAlgebra/Basic.lean,Mathlib/Analysis/CStarAlgebra/Multiplier.lean,Mathlib/Analysis/Calculus/ContDiff/Basic.lean,Mathlib/Analysis/Calculus/ContDiff/Bounds.lean,Mathlib/Analysis/Calculus/ContDiff/FTaylorSeries.lean,Mathlib/Analysis/Calculus/ContDiff/Operations.lean,Mathlib/Analysis/Calculus/Deriv/ZPow.lean,Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean,Mathlib/Analysis/Calculus/SmoothSeries.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/Convex/Radon.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/Normed/Algebra/Exponential.lean,Mathlib/Analysis/NormedSpace/Multilinear/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Basic.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecialFunctions/Gamma/BohrMollerup.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Log/Base.lean,Mathlib/Analysis/SpecialFunctions/Pow/Deriv.lean,Mathlib/Analysis/SpecialFunctions/Trigonometric/EulerSineProd.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/Extensive.lean,Mathlib/CategoryTheory/Filtered/Basic.lean,Mathlib/CategoryTheory/Limits/VanKampen.lean,Mathlib/CategoryTheory/Triangulated/TStructure/Basic.lean,Mathlib/Computability/Ackermann.lean,Mathlib/Computability/DFA.lean,Mathlib/Computability/EpsilonNFA.lean,Mathlib/Computability/Language.lean,Mathlib/Computability/NFA.lean,Mathlib/Computability/Partrec.lean,Mathlib/Computability/PartrecCode.lean,Mathlib/Computability/PostTuringMachine.lean,Mathlib/Computability/Primrec.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Computability/TMConfig.lean,Mathlib/Computability/TMToPartrec.lean,Mathlib/Computability/Tape.lean,Mathlib/Control/LawfulFix.lean,Mathlib/Data/Complex/Exponential.lean,Mathlib/Data/Countable/Basic.lean,Mathlib/Data/DFinsupp/Defs.lean,Mathlib/Data/DFinsupp/WellFounded.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/NatAntidiagonal.lean,Mathlib/Data/Finmap.lean,Mathlib/Data/Finset/Fold.lean,Mathlib/Data/Finset/Image.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Data/Finset/Lattice/Lemmas.lean,Mathlib/Data/Finset/Lattice/Pi.lean,Mathlib/Data/Finset/Max.lean,Mathlib/Data/Finset/NAry.lean,Mathlib/Data/Finset/NoncommProd.lean,Mathlib/Data/Finset/Sym.lean,Mathlib/Data/Finsupp/BigOperators.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/EquivFin.lean,Mathlib/Data/Fintype/Fin.lean	283	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	4-4562 4 days ago	4-4564 4 days ago	10-65025 10 days
13795	FR-vdash-bot author:FR-vdash-bot	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	35	['FR-vdash-bot', 'MichaelStollBayreuth', 'eric-wieser', 'github-actions', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'mattrobball']	nobody	3-85103 3 days ago	3-85105 3 days ago	52-31623 52 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	3-76441 3 days ago	3-76443 3 days ago	14-12910 14 days
23958	Kha author:Kha	leanprover/lean4#7868 benchmarking	ignore me	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['Kha', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	3-70319 3 days ago	6-45342 6 days ago	0-0 0 seconds
21385	Kha author:Kha	leanprover/lean4#6770 benchmarking	ignore me	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['Kha', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	74-49239 2 months ago	0-0 0 seconds
21519	JovanGerb author:JovanGerb	Lean pr testing 6973	Let's see the performance impact of modifying `dsimp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	17/15	Mathlib/CategoryTheory/Limits/Final.lean,Mathlib/CategoryTheory/Pi/Basic.lean,Mathlib/CategoryTheory/SmallObject/Iteration/Nonempty.lean,Mathlib/Condensed/Discrete/Colimit.lean,Mathlib/Data/List/Sigma.lean,Mathlib/GroupTheory/HNNExtension.lean,Mathlib/Order/RelSeries.lean,lake-manifest.json,lakefile.lean,lean-toolchain	10	12	['JovanGerb', 'github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	3-70319 3 days ago	39-57979 1 month ago	0-0 0 seconds
21547	Kha author:Kha	leanprover/lean4#6985 benchmarking	ignore me	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	n/a	['Kha', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	unknown	unknown
23465	JovanGerb author:JovanGerb	lean pr testing 7740	Let's see the performance implications of more specializing and inlining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	9	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	19-9583 19 days ago	0-18651 5 hours
23129	JovanGerb author:JovanGerb	Lean pr testing 7585	Some optimization in `simp` proof term generation. I found this by looking at `map_comp_cotangentComplex_baseChange` in `JacobiZariski.lean` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	15/14	Mathlib/Condensed/Discrete/Colimit.lean,Mathlib/RingTheory/DedekindDomain/SelmerGroup.lean,lake-manifest.json,lakefile.lean,lean-toolchain	5	4	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	3-70319 3 days ago	28-50137 28 days ago	0-0 0 seconds
23203	Kha author:Kha	leanprover/lean4#7597 benchmarking	ignore me	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['Kha', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	28-49601 28 days ago	0-0 0 seconds
23139	Kha author:Kha	leanprover/lean4#7575 benchmarking	ignore me	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	2	['Kha', 'leanprover-bot']	nobody	3-70319 3 days ago	28-50136 28 days ago	0-0 0 seconds
22812	JovanGerb author:JovanGerb	lean pr testing 7428	Added a `dsimp` cache to `simp`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	39-34083 1 month ago	0-0 0 seconds
13646	JovanGerb author:JovanGerb	Lean pr testing 4223	I lowered the instance priorities for `monadError`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	2/2	lakefile.lean,lean-toolchain	2	2	['JovanGerb', 'leanprover-bot']	nobody	3-70319 3 days ago	314-34895 10 months ago	0-0 0 seconds
13191	JovanGerb author:JovanGerb	Lean pr testing 4272	testing more aggressive caching --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	2/2	lakefile.lean,lean-toolchain	2	19	['JovanGerb', 'MichaelStollBayreuth', 'leanprover-bot']	nobody	3-70319 3 days ago	328-79327 10 months ago	0-0 0 seconds
13079	JovanGerb author:JovanGerb	Lean pr testing 4152	Testing some aggressive instance caching. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	new-contributor merge-conflict	555/723	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Group/Fin.lean,Mathlib/Algebra/Group/Units/Equiv.lean,Mathlib/Algebra/GroupRingAction/Basic.lean,Mathlib/Algebra/GroupRingAction/Invariant.lean,Mathlib/Algebra/GroupRingAction/Subobjects.lean,Mathlib/Algebra/GroupWithZero/Units/Basic.lean,Mathlib/Algebra/Order/GroupWithZero/WithZero.lean,Mathlib/Algebra/PUnitInstances.lean,Mathlib/Algebra/Polynomial/GroupRingAction.lean,Mathlib/Algebra/Ring/Aut.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Pointwise.lean,Mathlib/Analysis/Analytic/Basic.lean,Mathlib/Analysis/Calculus/FDeriv/Mul.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/Combinatorics/Enumerative/Composition.lean,Mathlib/Combinatorics/SetFamily/HarrisKleitman.lean,Mathlib/Combinatorics/SetFamily/Intersecting.lean,Mathlib/Combinatorics/SimpleGraph/Clique.lean,Mathlib/Computability/RegularExpressions.lean,Mathlib/Control/Random.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Fin/FlagRange.lean,Mathlib/Data/Fin/OrderHom.lean,Mathlib/Data/Fin/SuccPred.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/VecNotation.lean,Mathlib/Data/Finset/Sort.lean,Mathlib/Data/Finsupp/Fin.lean,Mathlib/Data/Fintype/Basic.lean,Mathlib/Data/Fintype/Card.lean,Mathlib/Data/Fintype/Fin.lean,Mathlib/Data/Fintype/Units.lean,Mathlib/Data/List/Cycle.lean,Mathlib/Data/List/Indexes.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/List/OfFn.lean,Mathlib/Data/Nat/Bits.lean,Mathlib/Data/Nat/Bitwise.lean,Mathlib/Data/ZMod/Basic.lean,Mathlib/FieldTheory/Fixed.lean,Mathlib/GroupTheory/FreeGroup/Basic.lean,Mathlib/GroupTheory/GroupAction/ConjAct.lean,Mathlib/GroupTheory/GroupAction/Hom.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/Perm/Fin.lean,Mathlib/GroupTheory/Perm/List.lean,Mathlib/GroupTheory/Perm/Support.lean,Mathlib/LinearAlgebra/Dimension/Free.lean,Mathlib/LinearAlgebra/FreeModule/PID.lean,Mathlib/LinearAlgebra/TensorAlgebra/ToTensorPower.lean,Mathlib/LinearAlgebra/TensorPower.lean,Mathlib/Logic/Equiv/Fin.lean,Mathlib/ModelTheory/Semantics.lean,Mathlib/Order/Fin.lean,Mathlib/Order/Grade.lean,Mathlib/Order/JordanHolder.lean,Mathlib/Order/RelSeries.lean,Mathlib/Order/SuccPred/LinearLocallyFinite.lean,Mathlib/Order/SupIndep.lean,Mathlib/RingTheory/Congruence.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/Tactic/Says.lean,Mathlib/Topology/UniformSpace/CompactConvergence.lean,Shake/Main.lean,lakefile.lean,lean-toolchain,test/CompileInductive.lean	70	4	['JovanGerb', 'leanprover-bot']	nobody	3-70319 3 days ago	329-79091 10 months ago	0-0 0 seconds
20799	llllvvuu author:llllvvuu	Lean pr testing 6651	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['github-actions', 'leanprover-bot', 'llllvvuu']	nobody	3-70319 3 days ago	92-53132 3 months ago	0-0 0 seconds
22529	kmill author:kmill	Lean pr testing 7313 (for benchmarking)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	32/16	Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Ring/Equiv.lean,Mathlib/CategoryTheory/Presentable/Basic.lean,Mathlib/CategoryTheory/Triangulated/Adjunction.lean,Mathlib/FieldTheory/IsAlgClosed/Basic.lean,Mathlib/FieldTheory/IsSepClosed.lean,Mathlib/Order/Hom/Bounded.lean,Mathlib/RingTheory/NonUnitalSubring/Defs.lean,Mathlib/RingTheory/RingInvo.lean,lake-manifest.json,lakefile.lean,lean-toolchain	12	3	['github-actions', 'kmill', 'leanprover-bot']	nobody	3-70319 3 days ago	46-14302 1 month ago	0-0 0 seconds
22544	JovanGerb author:JovanGerb	Lean pr testing 7301	Let's see if there is an improvement from optimizing the `bind` IR for `IO`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	45-73903 1 month ago	0-0 0 seconds
22177	JovanGerb author:JovanGerb	Lean pr testing 7181	Testing the effect of abstracting proofs in theorem statements --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	425/60	Mathlib/AlgebraicGeometry/FunctionField.lean,Mathlib/AlgebraicGeometry/Morphisms/AffineAnd.lean,Mathlib/CategoryTheory/SmallObject/Iteration/Nonempty.lean,Mathlib/FieldTheory/Galois/Profinite.lean,Mathlib/FieldTheory/IntermediateField/Adjoin/Basic.lean,Mathlib/FieldTheory/Laurent.lean,Mathlib/FieldTheory/SplittingField/Construction.lean,Mathlib/FieldTheory/SplittingField/IsSplittingField.lean,Mathlib/GroupTheory/Perm/Cycle/Basic.lean,Mathlib/LinearAlgebra/LinearPMap.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/AEMeasurable.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL1.lean,Mathlib/MeasureTheory/Function/ConditionalExpectation/CondexpL2.lean,Mathlib/RingTheory/Adjoin/Tower.lean,Mathlib/RingTheory/HahnSeries/Summable.lean,lake-manifest.json,lakefile.lean,lean-toolchain	18	3	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70319 3 days ago	56-33437 1 month ago	0-0 0 seconds
15598	kmill author:kmill	Lean pr testing 4938	Creating a PR for benchmarking --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	6/8	Counterexamples/ZeroDivisorsInAddMonoidAlgebras.lean,Mathlib/AlgebraicTopology/DoldKan/Degeneracies.lean,Mathlib/MeasureTheory/Order/UpperLower.lean,Mathlib/NumberTheory/WellApproximable.lean,lake-manifest.json,lakefile.lean,lean-toolchain	7	2	['kmill', 'leanprover-bot']	nobody	3-70319 3 days ago	254-47205 8 months ago	0-0 0 seconds
23644	JovanGerb author:JovanGerb	Lean pr testing 7804	Testing an optimization in `simp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	3-70319 3 days ago	15-32707 15 days ago	0-2933 48 minutes
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 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	4	['github-actions', 'grunweg', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	3-67829 3 days ago	3-67830 3 days ago	0-0 0 seconds
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	3-66136 3 days ago	3-66138 3 days ago	0-0 0 seconds
24058	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*NormedField`	--- - [ ] depends on: #24040 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	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	3-56046 3 days ago	4-31865 4 days 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	3-38041 3 days ago	273-64631 8 months ago	91-14162 91 days
8453	FR-vdash-bot author:FR-vdash-bot	chore(MeasureTheory): Golf, speed up	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-measure-probability merge-conflict	29/42	Mathlib/MeasureTheory/Integral/DivergenceTheorem.lean,Mathlib/MeasureTheory/Measure/FiniteMeasure.lean,Mathlib/MeasureTheory/Measure/Haar/Unique.lean,Mathlib/MeasureTheory/Measure/MeasureSpace.lean,Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/MeasureTheory/Measure/ProbabilityMeasure.lean,Mathlib/MeasureTheory/Measure/Regular.lean,Mathlib/Probability/ConditionalProbability.lean,Mathlib/Probability/Kernel/Condexp.lean	9	14	['FR-vdash-bot', 'YaelDillies', 'eric-wieser', 'github-actions', 'grunweg', 'leanprover-bot']	nobody	3-37960 3 days ago	283-67005 9 months ago	16-40723 16 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	3-37920 3 days ago	283-67005 9 months ago	0-0 0 seconds
7874	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'grunweg', 'leanprover-bot']	nobody	3-37895 3 days ago	273-64890 8 months 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	3-37721 3 days ago	283-67005 9 months 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	3-37681 3 days ago	251-76011 8 months ago	4-79214 4 days
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. - [ ] 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	215/27	Mathlib/MeasureTheory/Measure/Portmanteau.lean,Mathlib/Order/LiminfLimsup.lean,Mathlib/Topology/Instances/ENNReal.lean	3	7	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'j-loreaux', 'kkytola', 'leanprover-community-mathlib4-bot']	nobody	3-37607 3 days ago	213-55132 7 months ago	21-25493 21 days
9105	LukasMias author:LukasMias	feat(Algebra/Algebra/Prod): add prodUnique and uniqueProd for LinearEquiv and AlgebraEquiv	This adds definitions of linear equivalences for modules `M` with their left-/right-product with a trivial module `M \times 0` and `0 \times M`, and analogous statements for Algebras. --- [![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$	64/4	Mathlib/Algebra/Algebra/Prod.lean,Mathlib/Algebra/Group/Prod.lean,Mathlib/LinearAlgebra/Prod.lean,Mathlib/Logic/Equiv/Defs.lean	4	9	['LukasMias', 'eric-wieser', 'grunweg', 'mathlib-bors']	nobody	3-37530 3 days ago	193-13060 6 months ago	14-34450 14 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	3-37457 3 days ago	207-77004 6 months ago	14-58900 14 days
24106	FR-vdash-bot author:FR-vdash-bot	refactor: unbundle algebra from `*CStarAlgebra`	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/) - [ ] depends on: #24058	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	3-9187 3 days ago	3-11494 3 days ago *	0-0 0 seconds *
13780	adomani author:adomani	deprecate injective	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	31/9	.github/workflows/bors.yml,.github/workflows/build.yml,.github/workflows/build.yml.in,.github/workflows/build_fork.yml,Mathlib/Init/Function.lean,lake-manifest.json,lakefile.lean	7	2	['github-actions', 'grunweg']	nobody	3-4971 3 days ago	298-74715 9 months 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	3-4523 3 days ago	401-35195 1 year ago	0-0 0 seconds
23858	xroblot author:xroblot	feat(NumberField/IsCM): All CM-extensions come from the real maximal subfield	--- - [ ] depends on: #23760 [![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	425/13	Mathlib/Algebra/Algebra/Hom/Rat.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/FieldTheory/Galois/Basic.lean,Mathlib/FieldTheory/KrullTopology.lean,Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	2-78190 2 days ago	2-78193 2 days ago	0-1000 16 minutes
23533	xroblot author:xroblot	feat(NumberField): definition of CM-field and first properties	--- - [x] depends on: #23452 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-number-theory merge-conflict WIP	150/3	Mathlib/NumberTheory/NumberField/Basic.lean,Mathlib/NumberTheory/NumberField/CMField.Lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	3	21	['erdOne', 'faenuccio', 'github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'xroblot']	faenuccio assignee:faenuccio	2-69625 2 days ago	2-69625 2 days ago	8-5439 8 days
23621	FR-vdash-bot author:FR-vdash-bot	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	['FR-vdash-bot', 'github-actions', 'grunweg', 'leanprover-bot', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	2-30674 2 days ago	unknown	unknown
22866	xroblot author:xroblot	feat(NumberField/Ideal): asymptotics for the number of integral ideals of bounded norm	This PR is part of the proof of the Analytic Class Number Formula. --- - [ ] depends on: #22779 - [x] depends on: #22832 [![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	1198/21	Mathlib.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/ZLattice/Covolume.lean,Mathlib/Algebra/Ring/Divisibility/Basic.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/PolarCoord.lean,Mathlib/NumberTheory/NumberField/Ideal.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/PartialHomeomorph.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-74543 1 day ago	37-53995 1 month ago	0-431 7 minutes
17914	xroblot author:xroblot	feat(NumberTheory/NumberField): proof of the Analytic Class Number Formula	Let `K` be a number field. Define ```lean def dedekindZeta (s : ℂ) := LSeries (fun n ↦ Nat.card {I : Ideal (𝓞 K) // absNorm I = n}) s ``` and ```lean def residue : ℝ := (2 ^ nrRealPlaces K * (2 * π) ^ nrComplexPlaces K * regulator K * classNumber K) / (torsionOrder K * Real.sqrt \|discr K\|) ``` We prove: ```lean theorem dedekindZeta_residue : Tendsto (fun s : ℝ ↦ (s - 1) * dedekindZeta K s) (𝓝[>] 1) (𝓝 (residue K)) ``` --- - [x] depends on: #16675 - [x] depends on: #16822 - [x] depends on: #12488 - [x] depends on: #12405 - [x] depends on: #17943 - [x] depends on: #17944 - [x] depends on: #18130 - [x] depends on: #18166 - [x] depends on: #18231 - [x] depends on: #18246 - [x] depends on: #18245 - [x] depends on: #18248 - [x] depends on: #18400 - [x] depends on: #20660 - [x] depends on: #22115 - [x] depends on: #22397 - [ ] depends on: #22779 - [ ] depends on: #22866 [![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	1271/43	Mathlib.lean,Mathlib/Algebra/GroupWithZero/NonZeroDivisors.lean,Mathlib/Algebra/Module/ZLattice/Basic.lean,Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean,Mathlib/Analysis/SpecialFunctions/Pow/Real.lean,Mathlib/Data/ENNReal/Real.lean,Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean,Mathlib/MeasureTheory/Constructions/Pi.lean,Mathlib/MeasureTheory/Integral/IntegralEqImproper.lean,Mathlib/MeasureTheory/Measure/Prod.lean,Mathlib/NumberTheory/LSeries/SumCoeff.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/ConvexBody.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/FundamentalCone.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/NormLeOne.lean,Mathlib/NumberTheory/NumberField/CanonicalEmbedding/PolarCoord.lean,Mathlib/NumberTheory/NumberField/ClassNumber.lean,Mathlib/NumberTheory/NumberField/DedekindZeta.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean,Mathlib/NumberTheory/NumberField/Ideal.lean,Mathlib/NumberTheory/NumberField/Units/Basic.lean,Mathlib/NumberTheory/NumberField/Units/DirichletTheorem.lean,Mathlib/RingTheory/Ideal/Norm/AbsNorm.lean,Mathlib/Topology/Algebra/InfiniteSum/Constructions.lean,Mathlib/Topology/Algebra/Module/LinearMapPiProd.lean,Mathlib/Topology/Basic.lean,Mathlib/Topology/PartialHomeomorph.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	riccardobrasca assignee:riccardobrasca	1-74531 1 day ago	22-61438 22 days ago	0-20 20 seconds
12673	grunweg author:grunweg	feat: add ContDiff.lipschitzOnWith	A C¹ function is Lipschitz on each convex compact set. From sphere-eversion. -------- Commits can be reviewed independently. [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-analysis merge-conflict awaiting-author help-wanted	30/11	Mathlib/Analysis/Calculus/ContDiff/RCLike.lean	1	6	['Ruben-VandeVelde', 'github-actions', 'grunweg', 'sgouezel']	nobody	1-60434 1 day ago	1-60434 1 day ago	1-7552 1 day
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 --- - [ ] 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	42/23	Cache/Hashing.lean,Cache/IO.lean,Cache/Main.lean	3	15	['github-actions', 'grunweg', 'joneugster', 'kim-em', 'mathlib4-dependent-issues-bot']	nobody	1-47700 1 day ago	65-65436 2 months ago *	10-21925 10 days *
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	1-47576 1 day ago	64-44599 2 months ago *	0-0 0 seconds *
24128	kmill author:kmill	Lean pr testing 7991 (for benchmarking)	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	31/88	Counterexamples/CliffordAlgebraNotInjective.lean,Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Directed.lean,Mathlib/Algebra/Free.lean,Mathlib/Algebra/Homology/HomotopyCategory/HomComplexShift.lean,Mathlib/Algebra/Module/DedekindDomain.lean,Mathlib/Algebra/Order/AddGroupWithTop.lean,Mathlib/Algebra/Order/Group/Int/Sum.lean,Mathlib/Algebra/RingQuot.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/AlgebraicGeometry/Morphisms/QuasiCompact.lean,Mathlib/AlgebraicTopology/FundamentalGroupoid/Basic.lean,Mathlib/Analysis/Analytic/CPolynomialDef.lean,Mathlib/Analysis/BoxIntegral/Partition/Additive.lean,Mathlib/Analysis/CStarAlgebra/PositiveLinearMap.lean,Mathlib/Analysis/Convex/Combination.lean,Mathlib/Analysis/InnerProductSpace/Projection.lean,Mathlib/Analysis/SpecialFunctions/Gamma/Beta.lean,Mathlib/Analysis/SpecificLimits/Normed.lean,Mathlib/CategoryTheory/ComposableArrows.lean,Mathlib/CategoryTheory/EqToHom.lean,Mathlib/CategoryTheory/Localization/CalculusOfFractions.lean,Mathlib/CategoryTheory/Quotient/Linear.lean,Mathlib/CategoryTheory/Sites/Plus.lean,Mathlib/CategoryTheory/Subobject/Basic.lean,Mathlib/CategoryTheory/Subobject/Lattice.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Basic.lean,Mathlib/CategoryTheory/Triangulated/Opposite/Functor.lean,Mathlib/Combinatorics/Additive/CauchyDavenport.lean,Mathlib/Combinatorics/Enumerative/IncidenceAlgebra.lean,Mathlib/Combinatorics/Quiver/Push.lean,Mathlib/Combinatorics/SimpleGraph/ConcreteColorings.lean,Mathlib/Computability/TuringMachine.lean,Mathlib/Data/Fintype/CardEmbedding.lean,Mathlib/Data/Fintype/List.lean,Mathlib/Data/Int/Bitwise.lean,Mathlib/Data/List/NodupEquivFin.lean,Mathlib/Data/QPF/Multivariate/Constructions/Cofix.lean,Mathlib/Data/QPF/Univariate/Basic.lean,Mathlib/Geometry/Euclidean/Basic.lean,Mathlib/GroupTheory/CoprodI.lean,Mathlib/GroupTheory/Coset/Basic.lean,Mathlib/GroupTheory/GroupAction/Quotient.lean,Mathlib/GroupTheory/MonoidLocalization/Order.lean,Mathlib/GroupTheory/OrderOfElement.lean,Mathlib/GroupTheory/OreLocalization/Basic.lean,Mathlib/LinearAlgebra/BilinearMap.lean,Mathlib/LinearAlgebra/LinearIndependent/Defs.lean,Mathlib/MeasureTheory/VectorMeasure/Basic.lean,Mathlib/ModelTheory/DirectLimit.lean,Mathlib/ModelTheory/Encoding.lean,Mathlib/NumberTheory/LucasLehmer.lean,Mathlib/Order/SuccPred/Archimedean.lean,Mathlib/Probability/Independence/Basic.lean,Mathlib/Probability/Moments/ComplexMGF.lean,Mathlib/Probability/ProbabilityMassFunction/Binomial.lean,Mathlib/RingTheory/AlgebraicIndependent/TranscendenceBasis.lean,Mathlib/RingTheory/Filtration.lean,Mathlib/RingTheory/FractionalIdeal/Norm.lean,Mathlib/RingTheory/OreLocalization/Basic.lean,Mathlib/RingTheory/Polynomial/UniqueFactorization.lean,Mathlib/RingTheory/WittVector/FrobeniusFractionField.lean,Mathlib/Topology/Algebra/InfiniteSum/Module.lean,Mathlib/Topology/Germ.lean,lake-manifest.json,lakefile.lean,lean-toolchain	67	6	['github-actions', 'kmill', 'leanprover-bot', 'leanprover-community-bot-assistant']	nobody	1-43395 1 day ago	2-11088 2 days 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	1-41798 1 day ago	1-41798 1 day ago	0-790 13 minutes
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	1-41785 1 day ago	1-41785 1 day 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	1-41751 1 day ago	1-41751 1 day ago	25-60481 25 days
21764	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LongExactSequence): specialise LES API to group homology	Given a commutative ring `k` and a group `G`, this PR shows that a short exact sequence of `k`-linear `G`-representations `0 ⟶ X₁ ⟶ X₂ ⟶ X₃ ⟶ 0` induces a short exact sequence of complexes of inhomogeneous chains `0 ⟶ C(X₁) ⟶ C(X₂) ⟶ C(X₃) ⟶ 0`, where `Hₙ(C(Xᵢ))` is the `n`th group homology of `Xᵢ`. This allows us to specialize API about long exact sequences to group homology. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21754 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 - [ ] depends on: #21763 [![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$	3449/1178	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LongExactSequence.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	36	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41737 1 day ago	1-41737 1 day ago	0-676 11 minutes
21763	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Functoriality): low degree functoriality maps	Given a commutative ring `k`, a group homomorphism `f : G →* H`, a `k`-linear `G`-representation `A`, a `k`-linear `H`-representation `B`, and a representation morphism `A ⟶ Res(f)(B)`, we get a chain map `inhomogeneousChains A ⟶ inhomogeneousChains B` and hence maps on cohomology `Hₙ(G, A) ⟶ Hₙ(H, B)`. This PR provides specialised API for these maps in low degree. A future PR will add support for switching resolution. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21754 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 [![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$	3215/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	30	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41731 1 day ago	1-41731 1 day ago	0-994 16 minutes
21762	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LowDegree): `H₁(G, A) ≃+ Gᵃᵇ ⊗[ℤ] A` when `A` is trivial	This PR defines an isomorphism `H₁(G, A) ≃+ Gᵃᵇ ⊗[ℤ] A` when the `G`-representation on `A` is trivial. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 [![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$	2793/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41722 1 day ago	1-41722 1 day ago	0-1865 31 minutes
21759	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LowDegree): Identify `groupHomology A n` with `Hn A` for `n = 0, 1, 2`	This PR gives isomorphisms between `groupHomology A n` (defined as the `n`th homology of the complex of inhomogeneous chains of `A`, whose `n`th object is `Gⁿ →₀ A`, and `Hn A` (defined more minimally and explicitly) for `n = 0, 1, 2`. We do the same for cycles. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21755 - [ ] depends on: #21757 [![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$	2719/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41714 1 day ago	1-41714 1 day ago	0-1629 27 minutes
21757	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LowDegree): add `IsOneCycle` predicate and friends	Given an additive abelian group `A` with an appropriate scalar action of `G`, we provide support for turning a finsupp `f : G →₀ A` satisfying the 1-cycle identity into an element of the `oneCycles` of the representation on `A` corresponding to the scalar action. We also do this for 0-boundaries, 1-boundaries, 2-cycles and 2-boundaries. We follow the structure of `RepresentationTheory.Homological.GroupCohomology.LowDegree`. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21755 [![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$	2442/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41705 1 day ago	1-41705 1 day ago	0-422 7 minutes
21755	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LowDegree): API for(one/two)(Cycles/Boundaries)	This PR is more API for low degree group homology, adding (one/two)(Cycles/Boundaries), following the structure of `RepresentationTheory.Homological.GroupCohomology.LowDegree`. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 [![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$	2247/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41698 1 day ago	1-41698 1 day ago	0-201 3 minutes
21754	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Functoriality): add functoriality	Given a commutative ring `k`, a group homomorphism `f : G →* H`, a `k`-linear `G`-representation `A`, a `k`-linear `H`-representation `B`, and a representation morphism `A ⟶ Res(f)(B)`, we get a chain map `inhomogeneousChains A ⟶ inhomogeneousChains B` and hence maps on group homology `Hₙ(G, A) ⟶ Hₙ(H, B)`. A subsequent PR will add specialised API for low degree, and a future PR will add support for switching resolution. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 [![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$	1989/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	29	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41690 1 day ago	1-41690 1 day ago	0-219 3 minutes
21752	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LowDegree): simpler expressions for differentials	The first part of a file giving simpler expressions for group homology in low degree, following the structure of `RepresentationTheory.Homological.GroupCohomology.LowDegree`. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 [![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$	2072/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	27	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41684 1 day ago	1-41684 1 day ago	0-75 1 minute
21738	101damnations author:101damnations	feat(RepresentationTheory/*): add the bar resolution	The second of 2 PRs refactoring group cohomology to use the bar resolution. Given a comm ring `k` and a group `G`, this is the projective resolution of `k` as a trivial `G`-representation whose `n`th object is `Gⁿ →₀ k[G]` with representation defined pointwise by the left regular representation on k[G], and whose differentials send `(g₀, ..., gₙ)` to `g₀·(g₁, ..., gₙ) + ∑ (-1)ʲ⁺¹·(g₀, ..., gⱼgⱼ₊₁, ..., gₙ) + (-1)ⁿ⁺¹·(g₀, ..., gₙ₋₁)` for `j = 0, ... , n - 1`. The refactor means we can reuse this material to set up group homology. In #21736 we define an isomorphism `Rep.diagonalSuccIsoFree` between the objects in the standard resolution and bar resolution. In this PR we show that this isomorphism defines a commutative square with the respective differentials, and thus conclude that the bar resolution differential squares to zero and that the 2 complexes are isomorphic. We carry the exactness properties across this isomorphism to conclude the bar resolution is a projective resolution too, in `Rep.barResolution`. Deletions: - `groupCohomology.linearYonedaObjResolution` - `groupCohomology.resolution.ofMulActionBasis` - `Rep.diagonalHomEquiv*` --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21736 [![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$	826/788	Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	20	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41673 1 day ago	1-41673 1 day ago	0-1458 24 minutes
21736	101damnations author:101damnations	feat(RepresentationTheory/*): `Rep.diagonal k G (n + 1) ≅ Rep.free k G (Fin n → G) `	The first of 2 PRs refactoring group cohomology to use the bar resolution. Given a comm ring `k` and a group `G`, the bar resolution is the projective resolution of `k` as a trivial `G`-representation whose `n`th object is `Gⁿ →₀ k[G]`, with representation defined pointwise by the left regular representation on k[G], and whose differentials send `(g₀, ..., gₙ)` to `g₀·(g₁, ..., gₙ) + ∑ (-1)ʲ⁺¹·(g₀, ..., gⱼgⱼ₊₁, ..., gₙ) + (-1)ⁿ⁺¹·(g₀, ..., gₙ₋₁)` for `j = 0, ... , n - 1`. The refactor means we can reuse this material to set up group homology. This PR defines an isomorphism between the objects in the standard resolution and the bar resolution, i.e. an isomorphism of representations `k[Gⁿ⁺¹] ≅ (Gⁿ →₀ k[G])`, called `Rep.diagonalSuccIsoFree`. Moves: - groupCohomology.resolution.actionDiagonalSucc -> Action.diagonalSuccIsoTensorTrivial - groupCohomology.resolution.diagonalSucc -> Rep.diagonalSuccIsoTensorTrivial --- - [ ] depends on: #21652 - [ ] depends on: #21732 [![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$	566/431	Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	18	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41667 1 day ago	1-41667 1 day ago	0-6 6 seconds
21735	101damnations author:101damnations	feat(RepresentationTheory/Coinvariants): more API about the coinvariants of a representation	In this PR we add more API for the coinvariants of a representation `(V, ρ)`: * `Representation.coinvariantsFinsuppLEquiv ρ α`: given a type `α`, this is the `k`-linear equivalence between `(α →₀ V)_G` and `α →₀ V_G`. * `Representation.coinvariantsTprodLeftRegularLEquiv ρ`: the `k`-linear equivalence between `(V ⊗ k[G])_G` and `V` sending `⟦v ⊗ single g r⟧ ↦ r • ρ(g⁻¹)(v)`. * `Rep.coinvariantsTensor k G`: the functor sending representations `A, B` to `(A ⊗[k] B)_G`. This is naturally isomorphic to the functor sending `A, B` to `A ⊗[k[G]] B`, where we give `A` the `k[G]ᵐᵒᵖ`-module structure defined by `g • a := A.ρ g⁻¹ a`. * `Rep.coinvariantsTensorFreeLEquiv A α`: given a representation `A` and a type `α`, this is the `k`-linear equivalence between `(A ⊗ (α →₀ k[G]))_G` and `α →₀ A` sending `⟦a ⊗ single x (single g r)⟧ ↦ single x (r • ρ(g⁻¹)(a))`. This is useful for group homology. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 [![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$	768/238	Mathlib.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	19	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41658 1 day ago	1-41658 1 day ago	0-1337 22 minutes
21733	101damnations author:101damnations	feat(RepresentationTheory/Coinvariants): coinvariants of a representation	Given a commutative ring `k` and a monoid `G`, this PR introduces the coinvariants of a `k`-linear `G`-representation `(V, ρ)`. We first define `Representation.augmentationSubmodule`, the submodule of `V` generated by elements of the form `ρ g x - x` for `x : V`, `g : G`. Then the coinvariants of `(V, ρ)` are the quotient of `V` by this submodule. We show that the functor sending a representation to its coinvariants is left adjoint to the functor equipping a module with the trivial representation. --- - [ ] depends on: #21652 - [ ] depends on: #21732 [![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$	556/228	Mathlib.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	19	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41652 1 day ago	1-41652 1 day ago	0-618 10 minutes
22147	smmercuri author:smmercuri	feat: collections of distinct infinite places contain values that diverge around 1	For a given infinite place $v$ of a field $K$, there is an $a \in K$ such that $v(a) < 1$ while $w(a) > 1$ for all $w \neq v$ --- - [ ] depends on: #22142 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-analysis merge-conflict blocked-by-other-PR label:t-algebra$	511/2	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Logic/Pairwise.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	7	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41637 1 day ago	1-41637 1 day ago	0-1327 22 minutes
22153	smmercuri author:smmercuri	feat: weak approximation theorems for infinite places of a number field	The number field $K$ is dense in $\prod_v (K, v)$ and in the infinite adele ring $\prod_v K_v$, where $v$ ranges over the infinite places, $(K, v)$ denotes $K$ equipped with the topology induced by $v$, and $K_v$ is the completion of $K$ at $v$. --- - [ ] depends on #22147 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import t-algebra t-analysis t-number-theory merge-conflict label:t-algebra$	576/2	Mathlib/Algebra/Order/AbsoluteValue/Basic.lean,Mathlib/Analysis/AbsoluteValue/Equivalence.lean,Mathlib/Analysis/Normed/Ring/WithAbs.lean,Mathlib/Data/Fin/Basic.lean,Mathlib/Data/Finset/Lattice/Fold.lean,Mathlib/Logic/Pairwise.lean,Mathlib/NumberTheory/NumberField/AdeleRing.lean,Mathlib/NumberTheory/NumberField/Embeddings.lean	8	1	['github-actions']	nobody	1-41605 1 day ago	1-41605 1 day ago	11-23591 11 days
22656	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Functoriality): the degree 1 part of the corestriction-coinflation exact sequence	Given a `G`-representation `A` and a normal subgroup `S` of `G`, this PR defines the corestriction-coinflation short complex `H₁(S, A) ⟶ H₁(G, A) ⟶ H₁(G ⧸ S, A_S)` induced by the natural inclusion `S → G` and projections `G → G / S, A → A_S`. We proves it's exact, and that the righthand map is an epimorphism. --- - [ ] depends on: #22651 - [ ] depends on: #22652 - [ ] depends on: #22654 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21754 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 - [ ] depends on: #21763 [![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$	3593/965	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	24	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41597 1 day ago	43-47413 1 month ago *	43-47456 43 days *
22654	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Functoriality): the degree 1 part of the corestriction-coinflation exact sequence when the subgroup acts trivially	Given a normal subgroup `S` of `G` and a `G`-representation `A` on which `S` acts trivially, this PR defines the short complex `H₁(S, A) ⟶ H₁(G, A) ⟶ H₁(G ⧸ S, A)` induced by the natural inclusion `S → G` and projection `G → G / S`. We show it is exact and that the righthand map is an epimorphism. We use this to do the general case in #22656. --- I was uneasy about doing a special case first, but hopefully this short complex deserves to exist in its own right, since it's a more convenient expression for cores-coinf in the `S`-trivial case than a complex ending with `H₁(G ⧸ S, A_S)`... - [ ] depends on: #22651 - [ ] depends on: #22652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21754 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 - [ ] depends on: #21763 [![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$	3384/965	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/GroupTheory/QuotientGroup/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	23	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-41592 1 day ago	43-47400 1 month ago *	0-384 6 minutes *
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	1-41580 1 day ago	1-41580 1 day 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	1-40429 1 day ago	1-40429 1 day ago	0-0 0 seconds
20224	joelriou author:joelriou	feat(AlgebraicTopology/ModelCategory): a trick by Joyal	In order to construct a model category, we may sometimes have basically proven all the axioms with the exception of the left lifting property of cofibrations with respect to trivial fibrations. A trick by Joyal allows to obtain this lifting property under suitable assumptions, namely that cofibrations are stable under composition and cobase change. --- - [ ] depends on: #20210 - [ ] depends on: #19158 [![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	587/4	Mathlib.lean,Mathlib/AlgebraicTopology/ModelCategory/Basic.lean,Mathlib/AlgebraicTopology/ModelCategory/Instances.lean,Mathlib/AlgebraicTopology/ModelCategory/JoyalTrick.lean,Mathlib/CategoryTheory/MorphismProperty/WeakFactorizationSystem.lean,docs/references.bib	6	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-39643 1 day ago	10-37039 10 days ago	0-15 15 seconds
23117	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: #22714 [contains changes in `SetSemiring` as well]	large-import new-contributor t-measure-probability merge-conflict blocked-by-other-PR	481/104	Mathlib.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	10	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-39608 1 day ago	28-50139 28 days ago	0-1301 21 minutes
20781	artie2000 author:artie2000	feat(Algebra): Add Aesop automation around `Even` / `IsSquare`.	* Add `aesop` attributes to enable automation for goals of the form `Even x`, `IsSquare x` and `IsSumSq x` * Add test examples * Replace some existing proofs with `by aesop` The automation follows the principles of #20477 -- see library note [SetLike Aesop lemmas]. --- - [x] depends on: #16094 - [ ] depends on: #20818 - [ ] depends on: #20477 [![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$	257/117	Mathlib/Algebra/Algebra/NonUnitalSubalgebra.lean,Mathlib/Algebra/Algebra/Subalgebra/Basic.lean,Mathlib/Algebra/Field/Subfield/Basic.lean,Mathlib/Algebra/Field/Subfield/Defs.lean,Mathlib/Algebra/Group/Even.lean,Mathlib/Algebra/Group/Subgroup/Basic.lean,Mathlib/Algebra/Group/Subgroup/Defs.lean,Mathlib/Algebra/Group/Subgroup/Lattice.lean,Mathlib/Algebra/Group/Submonoid/Basic.lean,Mathlib/Algebra/Group/Submonoid/Defs.lean,Mathlib/Algebra/Group/Submonoid/Pointwise.lean,Mathlib/Algebra/Group/Subsemigroup/Basic.lean,Mathlib/Algebra/Group/Subsemigroup/Defs.lean,Mathlib/Algebra/HierarchyDesign.lean,Mathlib/Algebra/Lie/Subalgebra.lean,Mathlib/Algebra/Lie/Submodule.lean,Mathlib/Algebra/Module/Bimodule.lean,Mathlib/Algebra/Module/Submodule/Defs.lean,Mathlib/Algebra/Module/Submodule/Lattice.lean,Mathlib/Algebra/Order/Ring/Cone.lean,Mathlib/Algebra/Order/Star/Basic.lean,Mathlib/Algebra/Ring/Parity.lean,Mathlib/Algebra/Ring/Subring/Basic.lean,Mathlib/Algebra/Ring/Subring/Defs.lean,Mathlib/Algebra/Ring/Subsemiring/Basic.lean,Mathlib/Algebra/Ring/Subsemiring/Defs.lean,Mathlib/Algebra/Ring/SumsOfSquares.lean,Mathlib/Algebra/Star/Basic.lean,Mathlib/Algebra/Star/NonUnitalSubalgebra.lean,Mathlib/Algebra/Star/SelfAdjoint.lean,Mathlib/Algebra/Star/Subalgebra.lean,Mathlib/Analysis/Convex/Cone/Basic.lean,Mathlib/FieldTheory/IntermediateField/Basic.lean,Mathlib/LinearAlgebra/RootSystem/WeylGroup.lean,Mathlib/LinearAlgebra/Span/Defs.lean,Mathlib/NumberTheory/KummerDedekind.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/Basic.lean,Mathlib/NumberTheory/LegendreSymbol/QuadraticChar/GaussSum.lean,Mathlib/Order/BooleanSubalgebra.lean,Mathlib/RingTheory/Adjoin/Basic.lean,Mathlib/RingTheory/DedekindDomain/Different.lean,Mathlib/RingTheory/EssentialFiniteness.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/NonUnitalSubring/Basic.lean,Mathlib/RingTheory/NonUnitalSubsemiring/Basic.lean,Mathlib/RingTheory/TwoSidedIdeal/Basic.lean,Mathlib/Topology/Algebra/Algebra.lean,Mathlib/Topology/Algebra/NonUnitalAlgebra.lean,Mathlib/Topology/Algebra/NonUnitalStarAlgebra.lean,Mathlib/Topology/Algebra/StarSubalgebra.lean	50	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-37904 1 day ago	unknown	unknown
21766	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/LongExactSequence): specialise LES API to low degree group homology	Given a commutative ring `k` and a group `G`, this file shows that a short exact sequence of `k`-linear `G`-representations `0 ⟶ X₁ ⟶ X₂ ⟶ X₃ ⟶ 0` induces a short exact sequence of complexes of inhomogeneous chains `0 ⟶ C(X₁) ⟶ C(X₂) ⟶ C(X₃) ⟶ 0`, where `Hₙ(C(Xᵢ))` is the `n`th group homology of `Xᵢ`. This allows us to specialize API about long exact sequences to group homology; in this PR we focus on degrees `n = 0, 1, 2`. --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 - [ ] depends on: #21740 - [ ] depends on: #21752 - [ ] depends on: #21754 - [ ] depends on: #21755 - [ ] depends on: #21757 - [ ] depends on: #21759 - [ ] depends on: #21763 - [ ] depends on: #21764 [![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$	3645/1178	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/Algebra/Homology/ConcreteCategory.lean,Mathlib/Algebra/Homology/HomologySequence.lean,Mathlib/Algebra/Homology/ShortComplex/ModuleCat.lean,Mathlib/Algebra/Homology/ShortComplex/SnakeLemma.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Finsupp/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/LinearAlgebra/Finsupp/Pi.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Functoriality.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LongExactSequence.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	36	n/a	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-37897 1 day ago	unknown	unknown
21740	101damnations author:101damnations	feat(RepresentationTheory/Homological/GroupHomology/Basic): define group homology	Let `k` be a commutative ring and `G` a group. This PR defines the group homology of `A : Rep k G` to be the homology of the complex $$\dots \to \bigoplus_{G^2} A \to \bigoplus_{G^1} A \to \bigoplus_{G^0} A$$ (using `Finsupp` for the objects) with differential $d_n$ sending $a\cdot (g_0, \dots, g_n)$ to $$\rho(g_0^{-1})(a)\cdot (g_1, \dots, g_n) + \sum_{i = 0}^{n - 1}(-1)^{i + 1}a\cdot (g_0, \dots, g_ig_{i + 1}, \dots, g_n) + (-1)^{n + 1}a\cdot (g_0, \dots, g_{n - 1})$$ (where `ρ` is the representation attached to `A`). We have a `k`-linear isomorphism $\bigoplus_{G^n} A \cong (A \otimes_k \left(\bigoplus_{G^n} k[G]\right))_G$ given by `Rep.coinvariantsTensorFreeLEquiv`. If we conjugate the `n`th differential in $(A \otimes_k P)_G$ by this isomorphism, where `P` is the bar resolution of `k` as a trivial `k`-linear `G`-representation, then the resulting map agrees with the differential $d_n$ defined above, a fact we prove. Hence our $d_n$ squares to zero, and we get $\mathrm{H}_n(G, A) \cong \mathrm{Tor}_n(A, k),$ where $\mathrm{Tor}$ is defined by deriving the second argument of the functor $(A, B) \mapsto (A \otimes_k B)_G.$ --- - [ ] depends on: #21652 - [ ] depends on: #21732 - [ ] depends on: #21733 - [ ] depends on: #21735 - [ ] depends on: #21736 - [ ] depends on: #21738 [![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$	1822/1172	Mathlib.lean,Mathlib/Algebra/BigOperators/Fin.lean,Mathlib/CategoryTheory/Action/Basic.lean,Mathlib/CategoryTheory/Action/Concrete.lean,Mathlib/CategoryTheory/Action/Continuous.lean,Mathlib/CategoryTheory/Action/Limits.lean,Mathlib/CategoryTheory/Action/Monoidal.lean,Mathlib/CategoryTheory/Galois/Action.lean,Mathlib/CategoryTheory/Galois/EssSurj.lean,Mathlib/CategoryTheory/Galois/Examples.lean,Mathlib/CategoryTheory/Galois/Full.lean,Mathlib/CategoryTheory/Monoidal/Types/Basic.lean,Mathlib/LinearAlgebra/Finsupp/Defs.lean,Mathlib/RepresentationTheory/Basic.lean,Mathlib/RepresentationTheory/Character.lean,Mathlib/RepresentationTheory/Coinvariants.lean,Mathlib/RepresentationTheory/FDRep.lean,Mathlib/RepresentationTheory/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/GroupCohomology/Resolution.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Basic.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/Hilbert90.lean,Mathlib/RepresentationTheory/Homological/GroupCohomology/LowDegree.lean,Mathlib/RepresentationTheory/Homological/GroupHomology/Basic.lean,Mathlib/RepresentationTheory/Homological/Resolution.lean,Mathlib/RepresentationTheory/Invariants.lean,Mathlib/RepresentationTheory/Rep.lean	26	2	['github-actions', 'mathlib4-dependent-issues-bot']	nobody	1-37890 1 day ago	1-37890 1 day ago	0-2381 39 minutes
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	1-37883 1 day ago	1-37883 1 day ago	13-60072 13 days
21844	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	--- - [ ] depends on: #21162 [![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$	234/2	Mathlib.lean,Mathlib/Algebra/Order/GroupWithZero/Canonical.lean,Mathlib/RingTheory/DedekindDomain/AdicValuation.lean,Mathlib/RingTheory/Ideal/Quotient/Basic.lean,Mathlib/Topology/Algebra/Valued/LocallyCompact.lean,Mathlib/Topology/Algebra/Valued/ValuationTopology.lean,Mathlib/Topology/Algebra/Valued/WithZeroMulInt.lean	7	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	1-37876 1 day ago	1-37876 1 day ago	0-879 14 minutes
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 blocked-by-other-PR	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	1-37862 1 day ago	1-37862 1 day ago	0-265 4 minutes
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	2	['github-actions', 'leanprover-community-bot-assistant']	nobody	0-81253 22 hours ago	0-81255 22 hours ago	0-109 1 minute
22754	Parcly-Taxel author:Parcly-Taxel	chore: clear more `docBlame` nolints	--- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	large-import tech debt merge-conflict awaiting-author documentation	78/64	Mathlib/Algebra/CharP/MixedCharZero.lean,Mathlib/Algebra/ContinuedFractions/Computation/Basic.lean,Mathlib/Algebra/EuclideanDomain/Defs.lean,Mathlib/Algebra/Module/Injective.lean,Mathlib/Algebra/Notation/Defs.lean,Mathlib/Algebra/Polynomial/Basic.lean,Mathlib/Analysis/BoxIntegral/Partition/Filter.lean,Mathlib/Data/Analysis/Topology.lean,Mathlib/Data/Stream/Defs.lean,Mathlib/Data/Stream/Init.lean,Mathlib/Geometry/RingedSpace/PresheafedSpace.lean,Mathlib/LinearAlgebra/AffineSpace/AffineEquiv.lean,Mathlib/LinearAlgebra/AffineSpace/AffineMap.lean,Mathlib/LinearAlgebra/AffineSpace/Basis.lean,Mathlib/LinearAlgebra/AffineSpace/Independent.lean,Mathlib/LinearAlgebra/Matrix/Transvection.lean,Mathlib/LinearAlgebra/QuadraticForm/Basic.lean,Mathlib/Logic/Equiv/Defs.lean,Mathlib/NumberTheory/ModularForms/SlashActions.lean,Mathlib/NumberTheory/ModularForms/SlashInvariantForms.lean,Mathlib/Order/Atoms.lean,Mathlib/Order/PrimeIdeal.lean,Mathlib/RingTheory/GradedAlgebra/HomogeneousLocalization.lean,Mathlib/RingTheory/PowerBasis.lean,Mathlib/RingTheory/WittVector/Isocrystal.lean,Mathlib/Topology/MetricSpace/GromovHausdorff.lean,Mathlib/Topology/Order/Hom/Esakia.lean,scripts/nolints.json	28	9	['Parcly-Taxel', 'github-actions', 'jcommelin', 'leanprover-community-bot-assistant']	nobody	0-49360 13 hours ago	0-49362 13 hours ago	0-3406 56 minutes
18253	callesonne author:callesonne	feat(Bicactegory/NaturalTransformation): refactor strong natural transformations	This PR is a minor refactor of strong natural transformations. Previously, I had defined strong natural transformations between oplax functors. Now I specialize this directly to pseudofunctors and improve the API for this. The reason for doing this is that strong natural transformations of pseudofunctors should be defined directly in terms of pseudofunctors (instead of being defined as strong transformations of the underlying oplax functors). This is because there should also be strong transformations between lax functors, making this definition somewhat unnatural. I have chosen not to simultaneously define strong transformations between oplax functors as this is the only case I care about for now (I want to define the bicategory of pseudofunctors), but it will be very easy to generalize if one feels the need to do so. --- - [x] depends on: #18250 - [ ] depends on: #18252 [![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	297/291	Mathlib.lean,Mathlib/CategoryTheory/Bicategory/Modification/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Oplax.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Pseudo.lean,Mathlib/CategoryTheory/Bicategory/NaturalTransformation/Strong.lean	5	3	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot']	nobody	0-47867 13 hours ago	0-47868 13 hours ago	0-1334 22 minutes

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
24167	AntoineChambert-Loir author:AntoineChambert-Loir	Feat(Data/Fin/Tuple/Embedding): create embeddings of Fin Nat to types	Define * `Fin.Embedding.cons`, `Fin.Embedding.tail` * `Fin.Embedding.snoc`, `Fin.Embedding.init` * `Fin.Embedding.append` analogously to `Fin.cons`, `Fin.snoc`, `Fin.append`. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	t-data	160/0	Mathlib.lean,Mathlib/Data/Fin/Tuple/Basic.lean,Mathlib/Data/Fin/Tuple/Embedding.lean	3	1	['github-actions']	nobody	0-68371 18 hours ago	0-77759 21 hours ago	0-77816 21 hours
23465	JovanGerb author:JovanGerb	lean pr testing 7740	Let's see the performance implications of more specializing and inlining. --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	9	['JovanGerb', 'github-actions', 'leanprover-bot']	nobody	3-70320 3 days ago	19-9584 19 days ago	0-18651 5 hours
23644	JovanGerb author:JovanGerb	Lean pr testing 7804	Testing an optimization in `simp` --- [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)	merge-conflict	4/4	lake-manifest.json,lakefile.lean,lean-toolchain	3	3	['github-actions', 'leanprover-bot', 'leanprover-community-mathlib4-bot']	nobody	3-70320 3 days ago	15-32708 15 days ago	0-2933 48 minutes

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
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	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	1	['github-actions']	nobody	1-37943 1 day ago	1-37943 1 day ago	3-29472 3 days
24160	urkud author:urkud	feat: `(-1) ^ m = (-1) ^ n`	- add `neg_one_pow_congr`; - prove a lemma about parity of `Fin.succAbove i j + Fin.predAbove j i`. Backported (with adjusted API) from https://github.com/urkud/DeRhamCohomology --- - [x] depends on: #24153 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/from-referrer/)		24/4	Mathlib/Algebra/Ring/Parity.lean,Mathlib/Data/Fin/Parity.lean	2	4	['github-actions', 'leanprover-community-bot-assistant', 'mathlib4-dependent-issues-bot', 'urkud']	nobody	0-45711 12 hours ago	0-45711 12 hours ago	0-76589 21 hours

PRs with contradictory labels

There are currently no PRs with contradictory labels. Congratulations!